Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

Pull arch/tile updates from Chris Metcalf:
"These changes provide support for PCIe root complex and USB host mode
for tilegx's on-chip I/Os.

In addition, this pull provides the required underpinning for the
on-chip networking support that was pulled into 3.5. The changes have
all been through LKML (with several rounds for PCIe RC) and on
linux-next."

* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
tile: updates to pci root complex from community feedback
bounce: allow use of bounce pool via config option
usb: add host support for the tilegx architecture
arch/tile: provide kernel support for the tilegx USB shim
tile pci: enable IOMMU to support DMA for legacy devices
arch/tile: enable ZONE_DMA for tilegx
tilegx pci: support I/O to arbitrarily-cached pages
tile: remove unused header
arch/tile: tilegx PCI root complex support
arch/tile: provide kernel support for the tilegx TRIO shim
arch/tile: break out the "csum a long" function to <asm/checksum.h>
arch/tile: provide kernel support for the tilegx mPIPE shim
arch/tile: common DMA code for the GXIO IORPC subsystem
arch/tile: support MMIO-based readb/writeb etc.
arch/tile: introduce GXIO IORPC framework for tilegx

arch/tile/Kconfig

···
 
 config TILE
 	def_bool y
+	select HAVE_DMA_ATTRS
+	select HAVE_DMA_API_DEBUG
 	select HAVE_KVM if !TILEGX
 	select GENERIC_FIND_FIRST_BIT
 	select USE_GENERIC_SMP_HELPERS
···
 
 config NEED_DMA_MAP_STATE
 	def_bool y
+
+config ARCH_HAS_DMA_SET_COHERENT_MASK
+	bool
 
 config LOCKDEP_SUPPORT
 	def_bool y
···
 
 	  If unsure, say "true".
 
+config ZONE_DMA
+	def_bool y
+
+config IOMMU_HELPER
+	bool
+
+config NEED_SG_DMA_LENGTH
+	bool
+
+config SWIOTLB
+	bool
+	default TILEGX
+	select IOMMU_HELPER
+	select NEED_SG_DMA_LENGTH
+	select ARCH_HAS_DMA_SET_COHERENT_MASK
+
 # We do not currently support disabling NUMA.
 config NUMA
 	bool # "NUMA Memory Allocation and Scheduler Support"
···
 	  kernel will be built to run at.  Generally you should use
 	  the default value here.
 
+source "arch/tile/gxio/Kconfig"
+
 endmenu  # Tilera-specific configuration
 
 menu "Bus options"
···
 	default y
 	select PCI_DOMAINS
 	select GENERIC_PCI_IOMAP
+	select TILE_GXIO_TRIO if TILEGX
+	select ARCH_SUPPORTS_MSI if TILEGX
+	select PCI_MSI if TILEGX
 	---help---
 	  Enable PCI root complex support, so PCIe endpoint devices can
 	  be attached to the Tile chip.  Many, but not all, PCI devices
···
 	def_bool !PCI
 
 source "drivers/pci/Kconfig"
+
+config TILE_USB
+	tristate "Tilera USB host adapter support"
+	default y
+	depends on USB
+	depends on TILEGX
+	select TILE_GXIO_USB_HOST
+	---help---
+	  Provides USB host adapter support for the built-in EHCI and OHCI
+	  interfaces on TILE-Gx chips.
+
+# USB OHCI needs the bounce pool since tilegx will often have more
+# than 4GB of memory, but we don't currently use the IOTLB to present
+# a 32-bit address to OHCI.  So we need to use a bounce pool instead.
+config NEED_BOUNCE_POOL
+	def_bool USB_OHCI_HCD
 
 config HOTPLUG
 	bool "Support for hot-pluggable devices"

arch/tile/Makefile

···
 # See arch/tile/Kbuild for content of core part of the kernel
 core-y		+= arch/tile/
 
+core-$(CONFIG_TILE_GXIO) += arch/tile/gxio/
+
 ifdef TILERA_ROOT
 INSTALL_PATH ?= $(TILERA_ROOT)/tile/boot
 endif

arch/tile/gxio/Kconfig

···
+# Support direct access to TILE-Gx hardware from user space, via the
+# gxio library, or from kernel space, via kernel IORPC support.
+config TILE_GXIO
+	bool
+	depends on TILEGX
+
+# Support direct access to the common I/O DMA facility within the
+# TILE-Gx mPIPE and Trio hardware from kernel space.
+config TILE_GXIO_DMA
+	bool
+	select TILE_GXIO
+
+# Support direct access to the TILE-Gx mPIPE hardware from kernel space.
+config TILE_GXIO_MPIPE
+	bool
+	select TILE_GXIO
+	select TILE_GXIO_DMA
+
+# Support direct access to the TILE-Gx TRIO hardware from kernel space.
+config TILE_GXIO_TRIO
+	bool
+	select TILE_GXIO
+	select TILE_GXIO_DMA
+
+# Support direct access to the TILE-Gx USB hardware from kernel space.
+config TILE_GXIO_USB_HOST
+	bool
+	select TILE_GXIO

arch/tile/gxio/Makefile

···
+#
+# Makefile for the Tile-Gx device access support.
+#
+
+obj-$(CONFIG_TILE_GXIO) += iorpc_globals.o kiorpc.o
+obj-$(CONFIG_TILE_GXIO_DMA) += dma_queue.o
+obj-$(CONFIG_TILE_GXIO_MPIPE) += mpipe.o iorpc_mpipe.o iorpc_mpipe_info.o
+obj-$(CONFIG_TILE_GXIO_TRIO) += trio.o iorpc_trio.o
+obj-$(CONFIG_TILE_GXIO_USB_HOST) += usb_host.o iorpc_usb_host.o

arch/tile/gxio/dma_queue.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#include <linux/io.h>
+#include <linux/atomic.h>
+#include <linux/module.h>
+#include <gxio/dma_queue.h>
+
+/* Wait for a memory read to complete. */
+#define wait_for_value(val)                             \
+  __asm__ __volatile__("move %0, %0" :: "r"(val))
+
+/* The index is in the low 16. */
+#define DMA_QUEUE_INDEX_MASK ((1 << 16) - 1)
+
+/*
+ * The hardware descriptor-ring type.
+ * This matches the types used by mpipe (MPIPE_EDMA_POST_REGION_VAL_t)
+ * and trio (TRIO_PUSH_DMA_REGION_VAL_t or TRIO_PULL_DMA_REGION_VAL_t).
+ * See those types for more documentation on the individual fields.
+ */
+typedef union {
+	struct {
+#ifndef __BIG_ENDIAN__
+		uint64_t ring_idx:16;
+		uint64_t count:16;
+		uint64_t gen:1;
+		uint64_t __reserved:31;
+#else
+		uint64_t __reserved:31;
+		uint64_t gen:1;
+		uint64_t count:16;
+		uint64_t ring_idx:16;
+#endif
+	};
+	uint64_t word;
+} __gxio_ring_t;
+
+void __gxio_dma_queue_init(__gxio_dma_queue_t *dma_queue,
+			   void *post_region_addr, unsigned int num_entries)
+{
+	/*
+	 * Limit 65536 entry rings to 65535 credits because we only have a
+	 * 16 bit completion counter.
+	 */
+	int64_t credits = (num_entries < 65536) ? num_entries : 65535;
+
+	memset(dma_queue, 0, sizeof(*dma_queue));
+
+	dma_queue->post_region_addr = post_region_addr;
+	dma_queue->hw_complete_count = 0;
+	dma_queue->credits_and_next_index = credits << DMA_QUEUE_CREDIT_SHIFT;
+}
+
+EXPORT_SYMBOL_GPL(__gxio_dma_queue_init);
+
+void __gxio_dma_queue_update_credits(__gxio_dma_queue_t *dma_queue)
+{
+	__gxio_ring_t val;
+	uint64_t count;
+	uint64_t delta;
+	uint64_t new_count;
+
+	/*
+	 * Read the 64-bit completion count without touching the cache, so
+	 * we later avoid having to evict any sharers of this cache line
+	 * when we update it below.
+	 */
+	uint64_t orig_hw_complete_count =
+		cmpxchg(&dma_queue->hw_complete_count,
+			-1, -1);
+
+	/* Make sure the load completes before we access the hardware. */
+	wait_for_value(orig_hw_complete_count);
+
+	/* Read the 16-bit count of how many packets it has completed. */
+	val.word = __gxio_mmio_read(dma_queue->post_region_addr);
+	count = val.count;
+
+	/*
+	 * Calculate the number of completions since we last updated the
+	 * 64-bit counter.  It's safe to ignore the high bits because the
+	 * maximum credit value is 65535.
+	 */
+	delta = (count - orig_hw_complete_count) & 0xffff;
+	if (delta == 0)
+		return;
+
+	/*
+	 * Try to write back the count, advanced by delta.  If we race with
+	 * another thread, this might fail, in which case we return
+	 * immediately on the assumption that some credits are (or at least
+	 * were) available.
+	 */
+	new_count = orig_hw_complete_count + delta;
+	if (cmpxchg(&dma_queue->hw_complete_count,
+		    orig_hw_complete_count,
+		    new_count) != orig_hw_complete_count)
+		return;
+
+	/*
+	 * We succeeded in advancing the completion count; add back the
+	 * corresponding number of egress credits.
+	 */
+	__insn_fetchadd(&dma_queue->credits_and_next_index,
+			(delta << DMA_QUEUE_CREDIT_SHIFT));
+}
+
+EXPORT_SYMBOL_GPL(__gxio_dma_queue_update_credits);
+
+/*
+ * A separate 'blocked' method for put() so that backtraces and
+ * profiles will clearly indicate that we're wasting time spinning on
+ * egress availability rather than actually posting commands.
+ */
+int64_t __gxio_dma_queue_wait_for_credits(__gxio_dma_queue_t *dma_queue,
+					  int64_t modifier)
+{
+	int backoff = 16;
+	int64_t old;
+
+	do {
+		int i;
+		/* Back off to avoid spamming memory networks. */
+		for (i = backoff; i > 0; i--)
+			__insn_mfspr(SPR_PASS);
+
+		/* Check credits again. */
+		__gxio_dma_queue_update_credits(dma_queue);
+		old = __insn_fetchaddgez(&dma_queue->credits_and_next_index,
+					 modifier);
+
+		/* Calculate bounded exponential backoff for next iteration. */
+		if (backoff < 256)
+			backoff *= 2;
+	} while (old + modifier < 0);
+
+	return old;
+}
+
+EXPORT_SYMBOL_GPL(__gxio_dma_queue_wait_for_credits);
+
+int64_t __gxio_dma_queue_reserve_aux(__gxio_dma_queue_t *dma_queue,
+				     unsigned int num, int wait)
+{
+	return __gxio_dma_queue_reserve(dma_queue, num, wait != 0, true);
+}
+
+EXPORT_SYMBOL_GPL(__gxio_dma_queue_reserve_aux);
+
+int __gxio_dma_queue_is_complete(__gxio_dma_queue_t *dma_queue,
+				 int64_t completion_slot, int update)
+{
+	if (update) {
+		if (ACCESS_ONCE(dma_queue->hw_complete_count) >
+		    completion_slot)
+			return 1;
+
+		__gxio_dma_queue_update_credits(dma_queue);
+	}
+
+	return ACCESS_ONCE(dma_queue->hw_complete_count) > completion_slot;
+}
+
+EXPORT_SYMBOL_GPL(__gxio_dma_queue_is_complete);

arch/tile/gxio/iorpc_globals.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#include "gxio/iorpc_globals.h"
+
+struct arm_pollfd_param {
+	union iorpc_pollfd pollfd;
+};
+
+int __iorpc_arm_pollfd(int fd, int pollfd_cookie)
+{
+	struct arm_pollfd_param temp;
+	struct arm_pollfd_param *params = &temp;
+
+	params->pollfd.kernel.cookie = pollfd_cookie;
+
+	return hv_dev_pwrite(fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			     IORPC_OP_ARM_POLLFD);
+}
+
+EXPORT_SYMBOL(__iorpc_arm_pollfd);
+
+struct close_pollfd_param {
+	union iorpc_pollfd pollfd;
+};
+
+int __iorpc_close_pollfd(int fd, int pollfd_cookie)
+{
+	struct close_pollfd_param temp;
+	struct close_pollfd_param *params = &temp;
+
+	params->pollfd.kernel.cookie = pollfd_cookie;
+
+	return hv_dev_pwrite(fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			     IORPC_OP_CLOSE_POLLFD);
+}
+
+EXPORT_SYMBOL(__iorpc_close_pollfd);
+
+struct get_mmio_base_param {
+	HV_PTE base;
+};
+
+int __iorpc_get_mmio_base(int fd, HV_PTE *base)
+{
+	int __result;
+	struct get_mmio_base_param temp;
+	struct get_mmio_base_param *params = &temp;
+
+	__result =
+	    hv_dev_pread(fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			 IORPC_OP_GET_MMIO_BASE);
+	*base = params->base;
+
+	return __result;
+}
+
+EXPORT_SYMBOL(__iorpc_get_mmio_base);
+
+struct check_mmio_offset_param {
+	unsigned long offset;
+	unsigned long size;
+};
+
+int __iorpc_check_mmio_offset(int fd, unsigned long offset, unsigned long size)
+{
+	struct check_mmio_offset_param temp;
+	struct check_mmio_offset_param *params = &temp;
+
+	params->offset = offset;
+	params->size = size;
+
+	return hv_dev_pwrite(fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			     IORPC_OP_CHECK_MMIO_OFFSET);
+}
+
+EXPORT_SYMBOL(__iorpc_check_mmio_offset);

arch/tile/gxio/iorpc_mpipe.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#include "gxio/iorpc_mpipe.h"
+
+struct alloc_buffer_stacks_param {
+	unsigned int count;
+	unsigned int first;
+	unsigned int flags;
+};
+
+int gxio_mpipe_alloc_buffer_stacks(gxio_mpipe_context_t * context,
+				   unsigned int count, unsigned int first,
+				   unsigned int flags)
+{
+	struct alloc_buffer_stacks_param temp;
+	struct alloc_buffer_stacks_param *params = &temp;
+
+	params->count = count;
+	params->first = first;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_MPIPE_OP_ALLOC_BUFFER_STACKS);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_alloc_buffer_stacks);
+
+struct init_buffer_stack_aux_param {
+	union iorpc_mem_buffer buffer;
+	unsigned int stack;
+	unsigned int buffer_size_enum;
+};
+
+int gxio_mpipe_init_buffer_stack_aux(gxio_mpipe_context_t * context,
+				     void *mem_va, size_t mem_size,
+				     unsigned int mem_flags, unsigned int stack,
+				     unsigned int buffer_size_enum)
+{
+	int __result;
+	unsigned long long __cpa;
+	pte_t __pte;
+	struct init_buffer_stack_aux_param temp;
+	struct init_buffer_stack_aux_param *params = &temp;
+
+	__result = va_to_cpa_and_pte(mem_va, &__cpa, &__pte);
+	if (__result != 0)
+		return __result;
+	params->buffer.kernel.cpa = __cpa;
+	params->buffer.kernel.size = mem_size;
+	params->buffer.kernel.pte = __pte;
+	params->buffer.kernel.flags = mem_flags;
+	params->stack = stack;
+	params->buffer_size_enum = buffer_size_enum;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_MPIPE_OP_INIT_BUFFER_STACK_AUX);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_init_buffer_stack_aux);
+
+
+struct alloc_notif_rings_param {
+	unsigned int count;
+	unsigned int first;
+	unsigned int flags;
+};
+
+int gxio_mpipe_alloc_notif_rings(gxio_mpipe_context_t * context,
+				 unsigned int count, unsigned int first,
+				 unsigned int flags)
+{
+	struct alloc_notif_rings_param temp;
+	struct alloc_notif_rings_param *params = &temp;
+
+	params->count = count;
+	params->first = first;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_ALLOC_NOTIF_RINGS);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_alloc_notif_rings);
+
+struct init_notif_ring_aux_param {
+	union iorpc_mem_buffer buffer;
+	unsigned int ring;
+};
+
+int gxio_mpipe_init_notif_ring_aux(gxio_mpipe_context_t * context, void *mem_va,
+				   size_t mem_size, unsigned int mem_flags,
+				   unsigned int ring)
+{
+	int __result;
+	unsigned long long __cpa;
+	pte_t __pte;
+	struct init_notif_ring_aux_param temp;
+	struct init_notif_ring_aux_param *params = &temp;
+
+	__result = va_to_cpa_and_pte(mem_va, &__cpa, &__pte);
+	if (__result != 0)
+		return __result;
+	params->buffer.kernel.cpa = __cpa;
+	params->buffer.kernel.size = mem_size;
+	params->buffer.kernel.pte = __pte;
+	params->buffer.kernel.flags = mem_flags;
+	params->ring = ring;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_MPIPE_OP_INIT_NOTIF_RING_AUX);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_init_notif_ring_aux);
+
+struct request_notif_ring_interrupt_param {
+	union iorpc_interrupt interrupt;
+	unsigned int ring;
+};
+
+int gxio_mpipe_request_notif_ring_interrupt(gxio_mpipe_context_t * context,
+					    int inter_x, int inter_y,
+					    int inter_ipi, int inter_event,
+					    unsigned int ring)
+{
+	struct request_notif_ring_interrupt_param temp;
+	struct request_notif_ring_interrupt_param *params = &temp;
+
+	params->interrupt.kernel.x = inter_x;
+	params->interrupt.kernel.y = inter_y;
+	params->interrupt.kernel.ipi = inter_ipi;
+	params->interrupt.kernel.event = inter_event;
+	params->ring = ring;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_MPIPE_OP_REQUEST_NOTIF_RING_INTERRUPT);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_request_notif_ring_interrupt);
+
+struct enable_notif_ring_interrupt_param {
+	unsigned int ring;
+};
+
+int gxio_mpipe_enable_notif_ring_interrupt(gxio_mpipe_context_t * context,
+					   unsigned int ring)
+{
+	struct enable_notif_ring_interrupt_param temp;
+	struct enable_notif_ring_interrupt_param *params = &temp;
+
+	params->ring = ring;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_MPIPE_OP_ENABLE_NOTIF_RING_INTERRUPT);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_enable_notif_ring_interrupt);
+
+struct alloc_notif_groups_param {
+	unsigned int count;
+	unsigned int first;
+	unsigned int flags;
+};
+
+int gxio_mpipe_alloc_notif_groups(gxio_mpipe_context_t * context,
+				  unsigned int count, unsigned int first,
+				  unsigned int flags)
+{
+	struct alloc_notif_groups_param temp;
+	struct alloc_notif_groups_param *params = &temp;
+
+	params->count = count;
+	params->first = first;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_ALLOC_NOTIF_GROUPS);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_alloc_notif_groups);
+
+struct init_notif_group_param {
+	unsigned int group;
+	gxio_mpipe_notif_group_bits_t bits;
+};
+
+int gxio_mpipe_init_notif_group(gxio_mpipe_context_t * context,
+				unsigned int group,
+				gxio_mpipe_notif_group_bits_t bits)
+{
+	struct init_notif_group_param temp;
+	struct init_notif_group_param *params = &temp;
+
+	params->group = group;
+	params->bits = bits;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_INIT_NOTIF_GROUP);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_init_notif_group);
+
+struct alloc_buckets_param {
+	unsigned int count;
+	unsigned int first;
+	unsigned int flags;
+};
+
+int gxio_mpipe_alloc_buckets(gxio_mpipe_context_t * context, unsigned int count,
+			     unsigned int first, unsigned int flags)
+{
+	struct alloc_buckets_param temp;
+	struct alloc_buckets_param *params = &temp;
+
+	params->count = count;
+	params->first = first;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_ALLOC_BUCKETS);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_alloc_buckets);
+
+struct init_bucket_param {
+	unsigned int bucket;
+	MPIPE_LBL_INIT_DAT_BSTS_TBL_t bucket_info;
+};
+
+int gxio_mpipe_init_bucket(gxio_mpipe_context_t * context, unsigned int bucket,
+			   MPIPE_LBL_INIT_DAT_BSTS_TBL_t bucket_info)
+{
+	struct init_bucket_param temp;
+	struct init_bucket_param *params = &temp;
+
+	params->bucket = bucket;
+	params->bucket_info = bucket_info;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_INIT_BUCKET);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_init_bucket);
+
+struct alloc_edma_rings_param {
+	unsigned int count;
+	unsigned int first;
+	unsigned int flags;
+};
+
+int gxio_mpipe_alloc_edma_rings(gxio_mpipe_context_t * context,
+				unsigned int count, unsigned int first,
+				unsigned int flags)
+{
+	struct alloc_edma_rings_param temp;
+	struct alloc_edma_rings_param *params = &temp;
+
+	params->count = count;
+	params->first = first;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_ALLOC_EDMA_RINGS);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_alloc_edma_rings);
+
+struct init_edma_ring_aux_param {
+	union iorpc_mem_buffer buffer;
+	unsigned int ring;
+	unsigned int channel;
+};
+
+int gxio_mpipe_init_edma_ring_aux(gxio_mpipe_context_t * context, void *mem_va,
+				  size_t mem_size, unsigned int mem_flags,
+				  unsigned int ring, unsigned int channel)
+{
+	int __result;
+	unsigned long long __cpa;
+	pte_t __pte;
+	struct init_edma_ring_aux_param temp;
+	struct init_edma_ring_aux_param *params = &temp;
+
+	__result = va_to_cpa_and_pte(mem_va, &__cpa, &__pte);
+	if (__result != 0)
+		return __result;
+	params->buffer.kernel.cpa = __cpa;
+	params->buffer.kernel.size = mem_size;
+	params->buffer.kernel.pte = __pte;
+	params->buffer.kernel.flags = mem_flags;
+	params->ring = ring;
+	params->channel = channel;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_INIT_EDMA_RING_AUX);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_init_edma_ring_aux);
+
+
+int gxio_mpipe_commit_rules(gxio_mpipe_context_t * context, const void *blob,
+			    size_t blob_size)
+{
+	const void *params = blob;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params, blob_size,
+			     GXIO_MPIPE_OP_COMMIT_RULES);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_commit_rules);
+
+struct register_client_memory_param {
+	unsigned int iotlb;
+	HV_PTE pte;
+	unsigned int flags;
+};
+
+int gxio_mpipe_register_client_memory(gxio_mpipe_context_t * context,
+				      unsigned int iotlb, HV_PTE pte,
+				      unsigned int flags)
+{
+	struct register_client_memory_param temp;
+	struct register_client_memory_param *params = &temp;
+
+	params->iotlb = iotlb;
+	params->pte = pte;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_MPIPE_OP_REGISTER_CLIENT_MEMORY);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_register_client_memory);
+
+struct link_open_aux_param {
+	_gxio_mpipe_link_name_t name;
+	unsigned int flags;
+};
+
+int gxio_mpipe_link_open_aux(gxio_mpipe_context_t * context,
+			     _gxio_mpipe_link_name_t name, unsigned int flags)
+{
+	struct link_open_aux_param temp;
+	struct link_open_aux_param *params = &temp;
+
+	params->name = name;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_LINK_OPEN_AUX);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_link_open_aux);
+
+struct link_close_aux_param {
+	int mac;
+};
+
+int gxio_mpipe_link_close_aux(gxio_mpipe_context_t * context, int mac)
+{
+	struct link_close_aux_param temp;
+	struct link_close_aux_param *params = &temp;
+
+	params->mac = mac;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_LINK_CLOSE_AUX);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_link_close_aux);
+
+
+struct get_timestamp_aux_param {
+	uint64_t sec;
+	uint64_t nsec;
+	uint64_t cycles;
+};
+
+int gxio_mpipe_get_timestamp_aux(gxio_mpipe_context_t * context, uint64_t * sec,
+				 uint64_t * nsec, uint64_t * cycles)
+{
+	int __result;
+	struct get_timestamp_aux_param temp;
+	struct get_timestamp_aux_param *params = &temp;
+
+	__result =
+	    hv_dev_pread(context->fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			 GXIO_MPIPE_OP_GET_TIMESTAMP_AUX);
+	*sec = params->sec;
+	*nsec = params->nsec;
+	*cycles = params->cycles;
+
+	return __result;
+}
+
+EXPORT_SYMBOL(gxio_mpipe_get_timestamp_aux);
+
+struct set_timestamp_aux_param {
+	uint64_t sec;
+	uint64_t nsec;
+	uint64_t cycles;
+};
+
+int gxio_mpipe_set_timestamp_aux(gxio_mpipe_context_t * context, uint64_t sec,
+				 uint64_t nsec, uint64_t cycles)
+{
+	struct set_timestamp_aux_param temp;
+	struct set_timestamp_aux_param *params = &temp;
+
+	params->sec = sec;
+	params->nsec = nsec;
+	params->cycles = cycles;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_SET_TIMESTAMP_AUX);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_set_timestamp_aux);
+
+struct adjust_timestamp_aux_param {
+	int64_t nsec;
+};
+
+int gxio_mpipe_adjust_timestamp_aux(gxio_mpipe_context_t * context,
+				    int64_t nsec)
+{
+	struct adjust_timestamp_aux_param temp;
+	struct adjust_timestamp_aux_param *params = &temp;
+
+	params->nsec = nsec;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_MPIPE_OP_ADJUST_TIMESTAMP_AUX);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_adjust_timestamp_aux);
+
+struct arm_pollfd_param {
+	union iorpc_pollfd pollfd;
+};
+
+int gxio_mpipe_arm_pollfd(gxio_mpipe_context_t * context, int pollfd_cookie)
+{
+	struct arm_pollfd_param temp;
+	struct arm_pollfd_param *params = &temp;
+
+	params->pollfd.kernel.cookie = pollfd_cookie;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_ARM_POLLFD);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_arm_pollfd);
+
+struct close_pollfd_param {
+	union iorpc_pollfd pollfd;
+};
+
+int gxio_mpipe_close_pollfd(gxio_mpipe_context_t * context, int pollfd_cookie)
+{
+	struct close_pollfd_param temp;
+	struct close_pollfd_param *params = &temp;
+
+	params->pollfd.kernel.cookie = pollfd_cookie;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_CLOSE_POLLFD);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_close_pollfd);
+
+struct get_mmio_base_param {
+	HV_PTE base;
+};
+
+int gxio_mpipe_get_mmio_base(gxio_mpipe_context_t * context, HV_PTE *base)
+{
+	int __result;
+	struct get_mmio_base_param temp;
+	struct get_mmio_base_param *params = &temp;
+
+	__result =
+	    hv_dev_pread(context->fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			 GXIO_MPIPE_OP_GET_MMIO_BASE);
+	*base = params->base;
+
+	return __result;
+}
+
+EXPORT_SYMBOL(gxio_mpipe_get_mmio_base);
+
+struct check_mmio_offset_param {
+	unsigned long offset;
+	unsigned long size;
+};
+
+int gxio_mpipe_check_mmio_offset(gxio_mpipe_context_t * context,
+				 unsigned long offset, unsigned long size)
+{
+	struct check_mmio_offset_param temp;
+	struct check_mmio_offset_param *params = &temp;
+
+	params->offset = offset;
+	params->size = size;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_MPIPE_OP_CHECK_MMIO_OFFSET);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_check_mmio_offset);

arch/tile/gxio/iorpc_mpipe_info.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#include "gxio/iorpc_mpipe_info.h"
+
+
+struct enumerate_aux_param {
+	_gxio_mpipe_link_name_t name;
+	_gxio_mpipe_link_mac_t mac;
+};
+
+int gxio_mpipe_info_enumerate_aux(gxio_mpipe_info_context_t * context,
+				  unsigned int idx,
+				  _gxio_mpipe_link_name_t * name,
+				  _gxio_mpipe_link_mac_t * mac)
+{
+	int __result;
+	struct enumerate_aux_param temp;
+	struct enumerate_aux_param *params = &temp;
+
+	__result =
+	    hv_dev_pread(context->fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			 (((uint64_t) idx << 32) |
+			  GXIO_MPIPE_INFO_OP_ENUMERATE_AUX));
+	*name = params->name;
+	*mac = params->mac;
+
+	return __result;
+}
+
+EXPORT_SYMBOL(gxio_mpipe_info_enumerate_aux);
+
+struct get_mmio_base_param {
+	HV_PTE base;
+};
+
+int gxio_mpipe_info_get_mmio_base(gxio_mpipe_info_context_t * context,
+				  HV_PTE *base)
+{
+	int __result;
+	struct get_mmio_base_param temp;
+	struct get_mmio_base_param *params = &temp;
+
+	__result =
+	    hv_dev_pread(context->fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			 GXIO_MPIPE_INFO_OP_GET_MMIO_BASE);
+	*base = params->base;
+
+	return __result;
+}
+
+EXPORT_SYMBOL(gxio_mpipe_info_get_mmio_base);
+
+struct check_mmio_offset_param {
+	unsigned long offset;
+	unsigned long size;
+};
+
+int gxio_mpipe_info_check_mmio_offset(gxio_mpipe_info_context_t * context,
+				      unsigned long offset, unsigned long size)
+{
+	struct check_mmio_offset_param temp;
+	struct check_mmio_offset_param *params = &temp;
+
+	params->offset = offset;
+	params->size = size;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_MPIPE_INFO_OP_CHECK_MMIO_OFFSET);
+}
+
+EXPORT_SYMBOL(gxio_mpipe_info_check_mmio_offset);

arch/tile/gxio/iorpc_trio.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#include "gxio/iorpc_trio.h"
+
+struct alloc_asids_param {
+	unsigned int count;
+	unsigned int first;
+	unsigned int flags;
+};
+
+int gxio_trio_alloc_asids(gxio_trio_context_t * context, unsigned int count,
+			  unsigned int first, unsigned int flags)
+{
+	struct alloc_asids_param temp;
+	struct alloc_asids_param *params = &temp;
+
+	params->count = count;
+	params->first = first;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_ALLOC_ASIDS);
+}
+
+EXPORT_SYMBOL(gxio_trio_alloc_asids);
+
+
+struct alloc_memory_maps_param {
+	unsigned int count;
+	unsigned int first;
+	unsigned int flags;
+};
+
+int gxio_trio_alloc_memory_maps(gxio_trio_context_t * context,
+				unsigned int count, unsigned int first,
+				unsigned int flags)
+{
+	struct alloc_memory_maps_param temp;
+	struct alloc_memory_maps_param *params = &temp;
+
+	params->count = count;
+	params->first = first;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_ALLOC_MEMORY_MAPS);
+}
+
+EXPORT_SYMBOL(gxio_trio_alloc_memory_maps);
+
+
+struct alloc_pio_regions_param {
+	unsigned int count;
+	unsigned int first;
+	unsigned int flags;
+};
+
+int gxio_trio_alloc_pio_regions(gxio_trio_context_t * context,
+				unsigned int count, unsigned int first,
+				unsigned int flags)
+{
+	struct alloc_pio_regions_param temp;
+	struct alloc_pio_regions_param *params = &temp;
+
+	params->count = count;
+	params->first = first;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_ALLOC_PIO_REGIONS);
+}
+
+EXPORT_SYMBOL(gxio_trio_alloc_pio_regions);
+
+struct init_pio_region_aux_param {
+	unsigned int pio_region;
+	unsigned int mac;
+	uint32_t bus_address_hi;
+	unsigned int flags;
+};
+
+int gxio_trio_init_pio_region_aux(gxio_trio_context_t * context,
+				  unsigned int pio_region, unsigned int mac,
+				  uint32_t bus_address_hi, unsigned int flags)
+{
+	struct init_pio_region_aux_param temp;
+	struct init_pio_region_aux_param *params = &temp;
+
+	params->pio_region = pio_region;
+	params->mac = mac;
+	params->bus_address_hi = bus_address_hi;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_INIT_PIO_REGION_AUX);
+}
+
+EXPORT_SYMBOL(gxio_trio_init_pio_region_aux);
+
+
+struct init_memory_map_mmu_aux_param {
+	unsigned int map;
+	unsigned long va;
+	uint64_t size;
+	unsigned int asid;
+	unsigned int mac;
+	uint64_t bus_address;
+	unsigned int node;
+	unsigned int order_mode;
+};
+
+int gxio_trio_init_memory_map_mmu_aux(gxio_trio_context_t * context,
+				      unsigned int map, unsigned long va,
+				      uint64_t size, unsigned int asid,
+				      unsigned int mac, uint64_t bus_address,
+				      unsigned int node,
+				      unsigned int order_mode)
+{
+	struct init_memory_map_mmu_aux_param temp;
+	struct init_memory_map_mmu_aux_param *params = &temp;
+
+	params->map = map;
+	params->va = va;
+	params->size = size;
+	params->asid = asid;
+	params->mac = mac;
+	params->bus_address = bus_address;
+	params->node = node;
+	params->order_mode = order_mode;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_TRIO_OP_INIT_MEMORY_MAP_MMU_AUX);
+}
+
+EXPORT_SYMBOL(gxio_trio_init_memory_map_mmu_aux);
+
+struct get_port_property_param {
+	struct pcie_trio_ports_property trio_ports;
+};
+
+int gxio_trio_get_port_property(gxio_trio_context_t * context,
+				struct pcie_trio_ports_property *trio_ports)
+{
+	int __result;
+	struct get_port_property_param temp;
+	struct get_port_property_param *params = &temp;
+
+	__result =
+	    hv_dev_pread(context->fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			 GXIO_TRIO_OP_GET_PORT_PROPERTY);
+	*trio_ports = params->trio_ports;
+
+	return __result;
+}
+
+EXPORT_SYMBOL(gxio_trio_get_port_property);
+
+struct config_legacy_intr_param {
+	union iorpc_interrupt interrupt;
+	unsigned int mac;
+	unsigned int intx;
+};
+
+int gxio_trio_config_legacy_intr(gxio_trio_context_t * context, int inter_x,
+				 int inter_y, int inter_ipi, int inter_event,
+				 unsigned int mac, unsigned int intx)
+{
+	struct config_legacy_intr_param temp;
+	struct config_legacy_intr_param *params = &temp;
+
+	params->interrupt.kernel.x = inter_x;
+	params->interrupt.kernel.y = inter_y;
+	params->interrupt.kernel.ipi = inter_ipi;
+	params->interrupt.kernel.event = inter_event;
+	params->mac = mac;
+	params->intx = intx;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_CONFIG_LEGACY_INTR);
+}
+
+EXPORT_SYMBOL(gxio_trio_config_legacy_intr);
+
+struct config_msi_intr_param {
+	union iorpc_interrupt interrupt;
+	unsigned int mac;
+	unsigned int mem_map;
+	uint64_t mem_map_base;
+	uint64_t mem_map_limit;
+	unsigned int asid;
+};
+
+int gxio_trio_config_msi_intr(gxio_trio_context_t * context, int inter_x,
+			      int inter_y, int inter_ipi, int inter_event,
+			      unsigned int mac, unsigned int mem_map,
+			      uint64_t mem_map_base, uint64_t mem_map_limit,
+			      unsigned int asid)
+{
+	struct config_msi_intr_param temp;
+	struct config_msi_intr_param *params = &temp;
+
+	params->interrupt.kernel.x = inter_x;
+	params->interrupt.kernel.y = inter_y;
+	params->interrupt.kernel.ipi = inter_ipi;
+	params->interrupt.kernel.event = inter_event;
+	params->mac = mac;
+	params->mem_map = mem_map;
+	params->mem_map_base = mem_map_base;
+	params->mem_map_limit = mem_map_limit;
+	params->asid = asid;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_CONFIG_MSI_INTR);
+}
+
+EXPORT_SYMBOL(gxio_trio_config_msi_intr);
+
+
+struct set_mps_mrs_param {
+	uint16_t mps;
+	uint16_t mrs;
+	unsigned int mac;
+};
+
+int gxio_trio_set_mps_mrs(gxio_trio_context_t * context, uint16_t mps,
+			  uint16_t mrs, unsigned int mac)
+{
+	struct set_mps_mrs_param temp;
+	struct set_mps_mrs_param *params = &temp;
+
+	params->mps = mps;
+	params->mrs = mrs;
+	params->mac = mac;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_SET_MPS_MRS);
+}
+
+EXPORT_SYMBOL(gxio_trio_set_mps_mrs);
+
+struct force_rc_link_up_param {
+	unsigned int mac;
+};
+
+int gxio_trio_force_rc_link_up(gxio_trio_context_t * context, unsigned int mac)
+{
+	struct force_rc_link_up_param temp;
+	struct force_rc_link_up_param *params = &temp;
+
+	params->mac = mac;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_FORCE_RC_LINK_UP);
+}
+
+EXPORT_SYMBOL(gxio_trio_force_rc_link_up);
+
+struct force_ep_link_up_param {
+	unsigned int mac;
+};
+
+int gxio_trio_force_ep_link_up(gxio_trio_context_t * context, unsigned int mac)
+{
+	struct force_ep_link_up_param temp;
+	struct force_ep_link_up_param *params = &temp;
+
+	params->mac = mac;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_FORCE_EP_LINK_UP);
+}
+
+EXPORT_SYMBOL(gxio_trio_force_ep_link_up);
+
+struct get_mmio_base_param {
+	HV_PTE base;
+};
+
+int gxio_trio_get_mmio_base(gxio_trio_context_t * context, HV_PTE *base)
+{
+	int __result;
+	struct get_mmio_base_param temp;
+	struct get_mmio_base_param *params = &temp;
+
+	__result =
+	    hv_dev_pread(context->fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			 GXIO_TRIO_OP_GET_MMIO_BASE);
+	*base = params->base;
+
+	return __result;
+}
+
+EXPORT_SYMBOL(gxio_trio_get_mmio_base);
+
+struct check_mmio_offset_param {
+	unsigned long offset;
+	unsigned long size;
+};
+
+int gxio_trio_check_mmio_offset(gxio_trio_context_t * context,
+				unsigned long offset, unsigned long size)
+{
+	struct check_mmio_offset_param temp;
+	struct check_mmio_offset_param *params = &temp;
+
+	params->offset = offset;
+	params->size = size;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_TRIO_OP_CHECK_MMIO_OFFSET);
+}
+
+EXPORT_SYMBOL(gxio_trio_check_mmio_offset);

arch/tile/gxio/iorpc_usb_host.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#include "gxio/iorpc_usb_host.h"
+
+struct cfg_interrupt_param {
+	union iorpc_interrupt interrupt;
+};
+
+int gxio_usb_host_cfg_interrupt(gxio_usb_host_context_t * context, int inter_x,
+				int inter_y, int inter_ipi, int inter_event)
+{
+	struct cfg_interrupt_param temp;
+	struct cfg_interrupt_param *params = &temp;
+
+	params->interrupt.kernel.x = inter_x;
+	params->interrupt.kernel.y = inter_y;
+	params->interrupt.kernel.ipi = inter_ipi;
+	params->interrupt.kernel.event = inter_event;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params), GXIO_USB_HOST_OP_CFG_INTERRUPT);
+}
+
+EXPORT_SYMBOL(gxio_usb_host_cfg_interrupt);
+
+struct register_client_memory_param {
+	HV_PTE pte;
+	unsigned int flags;
+};
+
+int gxio_usb_host_register_client_memory(gxio_usb_host_context_t * context,
+					 HV_PTE pte, unsigned int flags)
+{
+	struct register_client_memory_param temp;
+	struct register_client_memory_param *params = &temp;
+
+	params->pte = pte;
+	params->flags = flags;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_USB_HOST_OP_REGISTER_CLIENT_MEMORY);
+}
+
+EXPORT_SYMBOL(gxio_usb_host_register_client_memory);
+
+struct get_mmio_base_param {
+	HV_PTE base;
+};
+
+int gxio_usb_host_get_mmio_base(gxio_usb_host_context_t * context, HV_PTE *base)
+{
+	int __result;
+	struct get_mmio_base_param temp;
+	struct get_mmio_base_param *params = &temp;
+
+	__result =
+	    hv_dev_pread(context->fd, 0, (HV_VirtAddr) params, sizeof(*params),
+			 GXIO_USB_HOST_OP_GET_MMIO_BASE);
+	*base = params->base;
+
+	return __result;
+}
+
+EXPORT_SYMBOL(gxio_usb_host_get_mmio_base);
+
+struct check_mmio_offset_param {
+	unsigned long offset;
+	unsigned long size;
+};
+
+int gxio_usb_host_check_mmio_offset(gxio_usb_host_context_t * context,
+				    unsigned long offset, unsigned long size)
+{
+	struct check_mmio_offset_param temp;
+	struct check_mmio_offset_param *params = &temp;
+
+	params->offset = offset;
+	params->size = size;
+
+	return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+			     sizeof(*params),
+			     GXIO_USB_HOST_OP_CHECK_MMIO_OFFSET);
+}
+
+EXPORT_SYMBOL(gxio_usb_host_check_mmio_offset);

arch/tile/gxio/kiorpc.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ *
+ * TILE-Gx IORPC support for kernel I/O drivers.
+ */
+
+#include <linux/mmzone.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <gxio/iorpc_globals.h>
+#include <gxio/kiorpc.h>
+
+#ifdef DEBUG_IORPC
+#define TRACE(FMT, ...) pr_info(SIMPLE_MSG_LINE FMT, ## __VA_ARGS__)
+#else
+#define TRACE(...)
+#endif
+
+/* Create kernel-VA-space MMIO mapping for an on-chip IO device. */
+void __iomem *iorpc_ioremap(int hv_fd, resource_size_t offset,
+			    unsigned long size)
+{
+	pgprot_t mmio_base, prot = { 0 };
+	unsigned long pfn;
+	int err;
+
+	/* Look up the shim's lotar and base PA. */
+	err = __iorpc_get_mmio_base(hv_fd, &mmio_base);
+	if (err) {
+		TRACE("get_mmio_base() failure: %d\n", err);
+		return NULL;
+	}
+
+	/* Make sure the HV driver approves of our offset and size. */
+	err = __iorpc_check_mmio_offset(hv_fd, offset, size);
+	if (err) {
+		TRACE("check_mmio_offset() failure: %d\n", err);
+		return NULL;
+	}
+
+	/*
+	 * mmio_base contains a base pfn and homing coordinates.  Turn
+	 * it into an MMIO pgprot and offset pfn.
+	 */
+	prot = hv_pte_set_lotar(prot, hv_pte_get_lotar(mmio_base));
+	pfn = pte_pfn(mmio_base) + PFN_DOWN(offset);
+
+	return ioremap_prot(PFN_PHYS(pfn), size, prot);
+}
+
+EXPORT_SYMBOL(iorpc_ioremap);

arch/tile/gxio/mpipe.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/*
+ * Implementation of mpipe gxio calls.
+ */
+
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/module.h>
+
+#include <gxio/iorpc_globals.h>
+#include <gxio/iorpc_mpipe.h>
+#include <gxio/iorpc_mpipe_info.h>
+#include <gxio/kiorpc.h>
+#include <gxio/mpipe.h>
+
+/* HACK: Avoid pointless "shadow" warnings. */
+#define link link_shadow
+
+int gxio_mpipe_init(gxio_mpipe_context_t *context, unsigned int mpipe_index)
+{
+	char file[32];
+
+	int fd;
+	int i;
+
+	snprintf(file, sizeof(file), "mpipe/%d/iorpc", mpipe_index);
+	fd = hv_dev_open((HV_VirtAddr) file, 0);
+	if (fd < 0) {
+		if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
+			return fd;
+		else
+			return -ENODEV;
+	}
+
+	context->fd = fd;
+
+	/* Map in the MMIO space. */
+	context->mmio_cfg_base = (void __force *)
+		iorpc_ioremap(fd, HV_MPIPE_CONFIG_MMIO_OFFSET,
+			      HV_MPIPE_CONFIG_MMIO_SIZE);
+	if (context->mmio_cfg_base == NULL)
+		goto cfg_failed;
+
+	context->mmio_fast_base = (void __force *)
+		iorpc_ioremap(fd, HV_MPIPE_FAST_MMIO_OFFSET,
+			      HV_MPIPE_FAST_MMIO_SIZE);
+	if (context->mmio_fast_base == NULL)
+		goto fast_failed;
+
+	/* Initialize the stacks. */
+	for (i = 0; i < 8; i++)
+		context->__stacks.stacks[i] = 255;
+
+	return 0;
+
+      fast_failed:
+	iounmap((void __force __iomem *)(context->mmio_cfg_base));
+      cfg_failed:
+	hv_dev_close(context->fd);
+	return -ENODEV;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_init);
+
+int gxio_mpipe_destroy(gxio_mpipe_context_t *context)
+{
+	iounmap((void __force __iomem *)(context->mmio_cfg_base));
+	iounmap((void __force __iomem *)(context->mmio_fast_base));
+	return hv_dev_close(context->fd);
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_destroy);
+
+static int16_t gxio_mpipe_buffer_sizes[8] =
+	{ 128, 256, 512, 1024, 1664, 4096, 10368, 16384 };
+
+gxio_mpipe_buffer_size_enum_t gxio_mpipe_buffer_size_to_buffer_size_enum(size_t
+									 size)
+{
+	int i;
+	for (i = 0; i < 7; i++)
+		if (size <= gxio_mpipe_buffer_sizes[i])
+			break;
+	return i;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_buffer_size_to_buffer_size_enum);
+
+size_t gxio_mpipe_buffer_size_enum_to_buffer_size(gxio_mpipe_buffer_size_enum_t
+						  buffer_size_enum)
+{
+	if (buffer_size_enum > 7)
+		buffer_size_enum = 7;
+
+	return gxio_mpipe_buffer_sizes[buffer_size_enum];
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_buffer_size_enum_to_buffer_size);
+
+size_t gxio_mpipe_calc_buffer_stack_bytes(unsigned long buffers)
+{
+	const int BUFFERS_PER_LINE = 12;
+
+	/* Count the number of cachlines. */
+	unsigned long lines =
+		(buffers + BUFFERS_PER_LINE - 1) / BUFFERS_PER_LINE;
+
+	/* Convert to bytes. */
+	return lines * CHIP_L2_LINE_SIZE();
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_calc_buffer_stack_bytes);
+
+int gxio_mpipe_init_buffer_stack(gxio_mpipe_context_t *context,
+				 unsigned int stack,
+				 gxio_mpipe_buffer_size_enum_t
+				 buffer_size_enum, void *mem, size_t mem_size,
+				 unsigned int mem_flags)
+{
+	int result;
+
+	memset(mem, 0, mem_size);
+
+	result = gxio_mpipe_init_buffer_stack_aux(context, mem, mem_size,
+						  mem_flags, stack,
+						  buffer_size_enum);
+	if (result < 0)
+		return result;
+
+	/* Save the stack. */
+	context->__stacks.stacks[buffer_size_enum] = stack;
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_init_buffer_stack);
+
+int gxio_mpipe_init_notif_ring(gxio_mpipe_context_t *context,
+			       unsigned int ring,
+			       void *mem, size_t mem_size,
+			       unsigned int mem_flags)
+{
+	return gxio_mpipe_init_notif_ring_aux(context, mem, mem_size,
+					      mem_flags, ring);
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_init_notif_ring);
+
+int gxio_mpipe_init_notif_group_and_buckets(gxio_mpipe_context_t *context,
+					    unsigned int group,
+					    unsigned int ring,
+					    unsigned int num_rings,
+					    unsigned int bucket,
+					    unsigned int num_buckets,
+					    gxio_mpipe_bucket_mode_t mode)
+{
+	int i;
+	int result;
+
+	gxio_mpipe_bucket_info_t bucket_info = { {
+						  .group = group,
+						  .mode = mode,
+						  }
+	};
+
+	gxio_mpipe_notif_group_bits_t bits = { {0} };
+
+	for (i = 0; i < num_rings; i++)
+		gxio_mpipe_notif_group_add_ring(&bits, ring + i);
+
+	result = gxio_mpipe_init_notif_group(context, group, bits);
+	if (result != 0)
+		return result;
+
+	for (i = 0; i < num_buckets; i++) {
+		bucket_info.notifring = ring + (i % num_rings);
+
+		result = gxio_mpipe_init_bucket(context, bucket + i,
+						bucket_info);
+		if (result != 0)
+			return result;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_init_notif_group_and_buckets);
+
+int gxio_mpipe_init_edma_ring(gxio_mpipe_context_t *context,
+			      unsigned int ring, unsigned int channel,
+			      void *mem, size_t mem_size,
+			      unsigned int mem_flags)
+{
+	memset(mem, 0, mem_size);
+
+	return gxio_mpipe_init_edma_ring_aux(context, mem, mem_size, mem_flags,
+					     ring, channel);
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_init_edma_ring);
+
+void gxio_mpipe_rules_init(gxio_mpipe_rules_t *rules,
+			   gxio_mpipe_context_t *context)
+{
+	rules->context = context;
+	memset(&rules->list, 0, sizeof(rules->list));
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_rules_init);
+
+int gxio_mpipe_rules_begin(gxio_mpipe_rules_t *rules,
+			   unsigned int bucket, unsigned int num_buckets,
+			   gxio_mpipe_rules_stacks_t *stacks)
+{
+	int i;
+	int stack = 255;
+
+	gxio_mpipe_rules_list_t *list = &rules->list;
+
+	/* Current rule. */
+	gxio_mpipe_rules_rule_t *rule =
+		(gxio_mpipe_rules_rule_t *) (list->rules + list->head);
+
+	unsigned int head = list->tail;
+
+	/*
+	 * Align next rule properly.
+	 *Note that "dmacs_and_vlans" will also be aligned.
+	 */
+	unsigned int pad = 0;
+	while (((head + pad) % __alignof__(gxio_mpipe_rules_rule_t)) != 0)
+		pad++;
+
+	/*
+	 * Verify room.
+	 * ISSUE: Mark rules as broken on error?
+	 */
+	if (head + pad + sizeof(*rule) >= sizeof(list->rules))
+		return GXIO_MPIPE_ERR_RULES_FULL;
+
+	/* Verify num_buckets is a power of 2. */
+	if (__builtin_popcount(num_buckets) != 1)
+		return GXIO_MPIPE_ERR_RULES_INVALID;
+
+	/* Add padding to previous rule. */
+	rule->size += pad;
+
+	/* Start a new rule. */
+	list->head = head + pad;
+
+	rule = (gxio_mpipe_rules_rule_t *) (list->rules + list->head);
+
+	/* Default some values. */
+	rule->headroom = 2;
+	rule->tailroom = 0;
+	rule->capacity = 16384;
+
+	/* Save the bucket info. */
+	rule->bucket_mask = num_buckets - 1;
+	rule->bucket_first = bucket;
+
+	for (i = 8 - 1; i >= 0; i--) {
+		int maybe =
+			stacks ? stacks->stacks[i] : rules->context->__stacks.
+			stacks[i];
+		if (maybe != 255)
+			stack = maybe;
+		rule->stacks.stacks[i] = stack;
+	}
+
+	if (stack == 255)
+		return GXIO_MPIPE_ERR_RULES_INVALID;
+
+	/* NOTE: Only entries at the end of the array can be 255. */
+	for (i = 8 - 1; i > 0; i--) {
+		if (rule->stacks.stacks[i] == 255) {
+			rule->stacks.stacks[i] = stack;
+			rule->capacity =
+				gxio_mpipe_buffer_size_enum_to_buffer_size(i -
+									   1);
+		}
+	}
+
+	rule->size = sizeof(*rule);
+	list->tail = list->head + rule->size;
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_rules_begin);
+
+int gxio_mpipe_rules_add_channel(gxio_mpipe_rules_t *rules,
+				 unsigned int channel)
+{
+	gxio_mpipe_rules_list_t *list = &rules->list;
+
+	gxio_mpipe_rules_rule_t *rule =
+		(gxio_mpipe_rules_rule_t *) (list->rules + list->head);
+
+	/* Verify channel. */
+	if (channel >= 32)
+		return GXIO_MPIPE_ERR_RULES_INVALID;
+
+	/* Verify begun. */
+	if (list->tail == 0)
+		return GXIO_MPIPE_ERR_RULES_EMPTY;
+
+	rule->channel_bits |= (1UL << channel);
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_rules_add_channel);
+
+int gxio_mpipe_rules_set_headroom(gxio_mpipe_rules_t *rules, uint8_t headroom)
+{
+	gxio_mpipe_rules_list_t *list = &rules->list;
+
+	gxio_mpipe_rules_rule_t *rule =
+		(gxio_mpipe_rules_rule_t *) (list->rules + list->head);
+
+	/* Verify begun. */
+	if (list->tail == 0)
+		return GXIO_MPIPE_ERR_RULES_EMPTY;
+
+	rule->headroom = headroom;
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_rules_set_headroom);
+
+int gxio_mpipe_rules_commit(gxio_mpipe_rules_t *rules)
+{
+	gxio_mpipe_rules_list_t *list = &rules->list;
+	unsigned int size =
+		offsetof(gxio_mpipe_rules_list_t, rules) + list->tail;
+	return gxio_mpipe_commit_rules(rules->context, list, size);
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_rules_commit);
+
+int gxio_mpipe_iqueue_init(gxio_mpipe_iqueue_t *iqueue,
+			   gxio_mpipe_context_t *context,
+			   unsigned int ring,
+			   void *mem, size_t mem_size, unsigned int mem_flags)
+{
+	/* The init call below will verify that "mem_size" is legal. */
+	unsigned int num_entries = mem_size / sizeof(gxio_mpipe_idesc_t);
+
+	iqueue->context = context;
+	iqueue->idescs = (gxio_mpipe_idesc_t *)mem;
+	iqueue->ring = ring;
+	iqueue->num_entries = num_entries;
+	iqueue->mask_num_entries = num_entries - 1;
+	iqueue->log2_num_entries = __builtin_ctz(num_entries);
+	iqueue->head = 1;
+#ifdef __BIG_ENDIAN__
+	iqueue->swapped = 0;
+#endif
+
+	/* Initialize the "tail". */
+	__gxio_mmio_write(mem, iqueue->head);
+
+	return gxio_mpipe_init_notif_ring(context, ring, mem, mem_size,
+					  mem_flags);
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_iqueue_init);
+
+int gxio_mpipe_equeue_init(gxio_mpipe_equeue_t *equeue,
+			   gxio_mpipe_context_t *context,
+			   unsigned int edma_ring_id,
+			   unsigned int channel,
+			   void *mem, unsigned int mem_size,
+			   unsigned int mem_flags)
+{
+	/* The init call below will verify that "mem_size" is legal. */
+	unsigned int num_entries = mem_size / sizeof(gxio_mpipe_edesc_t);
+
+	/* Offset used to read number of completed commands. */
+	MPIPE_EDMA_POST_REGION_ADDR_t offset;
+
+	int result = gxio_mpipe_init_edma_ring(context, edma_ring_id, channel,
+					       mem, mem_size, mem_flags);
+	if (result < 0)
+		return result;
+
+	memset(equeue, 0, sizeof(*equeue));
+
+	offset.word = 0;
+	offset.region =
+		MPIPE_MMIO_ADDR__REGION_VAL_EDMA -
+		MPIPE_MMIO_ADDR__REGION_VAL_IDMA;
+	offset.ring = edma_ring_id;
+
+	__gxio_dma_queue_init(&equeue->dma_queue,
+			      context->mmio_fast_base + offset.word,
+			      num_entries);
+	equeue->edescs = mem;
+	equeue->mask_num_entries = num_entries - 1;
+	equeue->log2_num_entries = __builtin_ctz(num_entries);
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_equeue_init);
+
+int gxio_mpipe_set_timestamp(gxio_mpipe_context_t *context,
+			     const struct timespec *ts)
+{
+	cycles_t cycles = get_cycles();
+	return gxio_mpipe_set_timestamp_aux(context, (uint64_t)ts->tv_sec,
+					    (uint64_t)ts->tv_nsec,
+					    (uint64_t)cycles);
+}
+
+int gxio_mpipe_get_timestamp(gxio_mpipe_context_t *context,
+			     struct timespec *ts)
+{
+	int ret;
+	cycles_t cycles_prev, cycles_now, clock_rate;
+	cycles_prev = get_cycles();
+	ret = gxio_mpipe_get_timestamp_aux(context, (uint64_t *)&ts->tv_sec,
+					   (uint64_t *)&ts->tv_nsec,
+					   (uint64_t *)&cycles_now);
+	if (ret < 0) {
+		return ret;
+	}
+
+	clock_rate = get_clock_rate();
+	ts->tv_nsec -= (cycles_now - cycles_prev) * 1000000000LL / clock_rate;
+	if (ts->tv_nsec < 0) {
+		ts->tv_nsec += 1000000000LL;
+		ts->tv_sec -= 1;
+	}
+	return ret;
+}
+
+int gxio_mpipe_adjust_timestamp(gxio_mpipe_context_t *context, int64_t delta)
+{
+	return gxio_mpipe_adjust_timestamp_aux(context, delta);
+}
+
+/* Get our internal context used for link name access.  This context is
+ *  special in that it is not associated with an mPIPE service domain.
+ */
+static gxio_mpipe_context_t *_gxio_get_link_context(void)
+{
+	static gxio_mpipe_context_t context;
+	static gxio_mpipe_context_t *contextp;
+	static int tried_open = 0;
+	static DEFINE_MUTEX(mutex);
+
+	mutex_lock(&mutex);
+
+	if (!tried_open) {
+		int i = 0;
+		tried_open = 1;
+
+		/*
+		 * "4" here is the maximum possible number of mPIPE shims; it's
+		 * an exaggeration but we shouldn't ever go beyond 2 anyway.
+		 */
+		for (i = 0; i < 4; i++) {
+			char file[80];
+
+			snprintf(file, sizeof(file), "mpipe/%d/iorpc_info", i);
+			context.fd = hv_dev_open((HV_VirtAddr) file, 0);
+			if (context.fd < 0)
+				continue;
+
+			contextp = &context;
+			break;
+		}
+	}
+
+	mutex_unlock(&mutex);
+
+	return contextp;
+}
+
+int gxio_mpipe_link_enumerate_mac(int idx, char *link_name, uint8_t *link_mac)
+{
+	int rv;
+	_gxio_mpipe_link_name_t name;
+	_gxio_mpipe_link_mac_t mac;
+
+	gxio_mpipe_context_t *context = _gxio_get_link_context();
+	if (!context)
+		return GXIO_ERR_NO_DEVICE;
+
+	rv = gxio_mpipe_info_enumerate_aux(context, idx, &name, &mac);
+	if (rv >= 0) {
+		strncpy(link_name, name.name, sizeof(name.name));
+		memcpy(link_mac, mac.mac, sizeof(mac.mac));
+	}
+
+	return rv;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_link_enumerate_mac);
+
+int gxio_mpipe_link_open(gxio_mpipe_link_t *link,
+			 gxio_mpipe_context_t *context, const char *link_name,
+			 unsigned int flags)
+{
+	_gxio_mpipe_link_name_t name;
+	int rv;
+
+	strncpy(name.name, link_name, sizeof(name.name));
+	name.name[GXIO_MPIPE_LINK_NAME_LEN - 1] = '\0';
+
+	rv = gxio_mpipe_link_open_aux(context, name, flags);
+	if (rv < 0)
+		return rv;
+
+	link->context = context;
+	link->channel = rv >> 8;
+	link->mac = rv & 0xFF;
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_link_open);
+
+int gxio_mpipe_link_close(gxio_mpipe_link_t *link)
+{
+	return gxio_mpipe_link_close_aux(link->context, link->mac);
+}
+
+EXPORT_SYMBOL_GPL(gxio_mpipe_link_close);

arch/tile/gxio/trio.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/*
+ * Implementation of trio gxio calls.
+ */
+
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/module.h>
+
+#include <gxio/trio.h>
+#include <gxio/iorpc_globals.h>
+#include <gxio/iorpc_trio.h>
+#include <gxio/kiorpc.h>
+
+int gxio_trio_init(gxio_trio_context_t *context, unsigned int trio_index)
+{
+	char file[32];
+	int fd;
+
+	snprintf(file, sizeof(file), "trio/%d/iorpc", trio_index);
+	fd = hv_dev_open((HV_VirtAddr) file, 0);
+	if (fd < 0) {
+		context->fd = -1;
+
+		if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
+			return fd;
+		else
+			return -ENODEV;
+	}
+
+	context->fd = fd;
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_trio_init);

arch/tile/gxio/usb_host.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/*
+ *
+ * Implementation of USB gxio calls.
+ */
+
+#include <linux/io.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+
+#include <gxio/iorpc_globals.h>
+#include <gxio/iorpc_usb_host.h>
+#include <gxio/kiorpc.h>
+#include <gxio/usb_host.h>
+
+int gxio_usb_host_init(gxio_usb_host_context_t * context, int usb_index,
+		       int is_ehci)
+{
+	char file[32];
+	int fd;
+
+	if (is_ehci)
+		snprintf(file, sizeof(file), "usb_host/%d/iorpc/ehci",
+			 usb_index);
+	else
+		snprintf(file, sizeof(file), "usb_host/%d/iorpc/ohci",
+			 usb_index);
+
+	fd = hv_dev_open((HV_VirtAddr) file, 0);
+	if (fd < 0) {
+		if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
+			return fd;
+		else
+			return -ENODEV;
+	}
+
+	context->fd = fd;
+
+	// Map in the MMIO space.
+	context->mmio_base =
+		(void __force *)iorpc_ioremap(fd, 0, HV_USB_HOST_MMIO_SIZE);
+
+	if (context->mmio_base == NULL) {
+		hv_dev_close(context->fd);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_usb_host_init);
+
+int gxio_usb_host_destroy(gxio_usb_host_context_t * context)
+{
+	iounmap((void __force __iomem *)(context->mmio_base));
+	hv_dev_close(context->fd);
+
+	context->mmio_base = NULL;
+	context->fd = -1;
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(gxio_usb_host_destroy);
+
+void *gxio_usb_host_get_reg_start(gxio_usb_host_context_t * context)
+{
+	return context->mmio_base;
+}
+
+EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_start);
+
+size_t gxio_usb_host_get_reg_len(gxio_usb_host_context_t * context)
+{
+	return HV_USB_HOST_MMIO_SIZE;
+}
+
+EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_len);

arch/tile/include/arch/mpipe.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_MPIPE_H__
+#define __ARCH_MPIPE_H__
+
+#include <arch/abi.h>
+#include <arch/mpipe_def.h>
+
+#ifndef __ASSEMBLER__
+
+/*
+ * MMIO Ingress DMA Release Region Address.
+ * This is a description of the physical addresses used to manipulate ingress
+ * credit counters.  Accesses to this address space should use an address of
+ * this form and a value like that specified in IDMA_RELEASE_REGION_VAL.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /* Reserved. */
+    uint_reg_t __reserved_0  : 3;
+    /* NotifRing to be released */
+    uint_reg_t ring          : 8;
+    /* Bucket to be released */
+    uint_reg_t bucket        : 13;
+    /* Enable NotifRing release */
+    uint_reg_t ring_enable   : 1;
+    /* Enable Bucket release */
+    uint_reg_t bucket_enable : 1;
+    /*
+     * This field of the address selects the region (address space) to be
+     * accessed.  For the iDMA release region, this field must be 4.
+     */
+    uint_reg_t region        : 3;
+    /* Reserved. */
+    uint_reg_t __reserved_1  : 6;
+    /* This field of the address indexes the 32 entry service domain table. */
+    uint_reg_t svc_dom       : 5;
+    /* Reserved. */
+    uint_reg_t __reserved_2  : 24;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved_2  : 24;
+    uint_reg_t svc_dom       : 5;
+    uint_reg_t __reserved_1  : 6;
+    uint_reg_t region        : 3;
+    uint_reg_t bucket_enable : 1;
+    uint_reg_t ring_enable   : 1;
+    uint_reg_t bucket        : 13;
+    uint_reg_t ring          : 8;
+    uint_reg_t __reserved_0  : 3;
+#endif
+  };
+
+  uint_reg_t word;
+} MPIPE_IDMA_RELEASE_REGION_ADDR_t;
+
+/*
+ * MMIO Ingress DMA Release Region Value - Release NotifRing and/or Bucket.
+ * Provides release of the associated NotifRing.  The address of the MMIO
+ * operation is described in IDMA_RELEASE_REGION_ADDR.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /*
+     * Number of packets being released.  The load balancer's count of
+     * inflight packets will be decremented by this amount for the associated
+     * Bucket and/or NotifRing
+     */
+    uint_reg_t count      : 16;
+    /* Reserved. */
+    uint_reg_t __reserved : 48;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved : 48;
+    uint_reg_t count      : 16;
+#endif
+  };
+
+  uint_reg_t word;
+} MPIPE_IDMA_RELEASE_REGION_VAL_t;
+
+/*
+ * MMIO Buffer Stack Manager Region Address.
+ * This MMIO region is used for posting or fetching buffers to/from the
+ * buffer stack manager.  On an MMIO load, this pops a buffer descriptor from
+ * the top of stack if one is available.  On an MMIO store, this pushes a
+ * buffer to the stack.  The value read or written is described in
+ * BSM_REGION_VAL.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /* Reserved. */
+    uint_reg_t __reserved_0 : 3;
+    /* BufferStack being accessed. */
+    uint_reg_t stack        : 5;
+    /* Reserved. */
+    uint_reg_t __reserved_1 : 18;
+    /*
+     * This field of the address selects the region (address space) to be
+     * accessed.  For the buffer stack manager region, this field must be 6.
+     */
+    uint_reg_t region       : 3;
+    /* Reserved. */
+    uint_reg_t __reserved_2 : 6;
+    /* This field of the address indexes the 32 entry service domain table. */
+    uint_reg_t svc_dom      : 5;
+    /* Reserved. */
+    uint_reg_t __reserved_3 : 24;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved_3 : 24;
+    uint_reg_t svc_dom      : 5;
+    uint_reg_t __reserved_2 : 6;
+    uint_reg_t region       : 3;
+    uint_reg_t __reserved_1 : 18;
+    uint_reg_t stack        : 5;
+    uint_reg_t __reserved_0 : 3;
+#endif
+  };
+
+  uint_reg_t word;
+} MPIPE_BSM_REGION_ADDR_t;
+
+/*
+ * MMIO Buffer Stack Manager Region Value.
+ * This MMIO region is used for posting or fetching buffers to/from the
+ * buffer stack manager.  On an MMIO load, this pops a buffer descriptor from
+ * the top of stack if one is available. On an MMIO store, this pushes a
+ * buffer to the stack.  The address of the MMIO operation is described in
+ * BSM_REGION_ADDR.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /* Reserved. */
+    uint_reg_t __reserved_0 : 7;
+    /*
+     * Base virtual address of the buffer.  Must be sign extended by consumer.
+     */
+    int_reg_t va           : 35;
+    /* Reserved. */
+    uint_reg_t __reserved_1 : 6;
+    /*
+     * Index of the buffer stack to which this buffer belongs.  Ignored on
+     * writes since the offset bits specify the stack being accessed.
+     */
+    uint_reg_t stack_idx    : 5;
+    /* Reserved. */
+    uint_reg_t __reserved_2 : 5;
+    /*
+     * Reads as one to indicate that this is a hardware managed buffer.
+     * Ignored on writes since all buffers on a given stack are the same size.
+     */
+    uint_reg_t hwb          : 1;
+    /*
+     * Encoded size of buffer (ignored on writes):
+     * 0 = 128 bytes
+     * 1 = 256 bytes
+     * 2 = 512 bytes
+     * 3 = 1024 bytes
+     * 4 = 1664 bytes
+     * 5 = 4096 bytes
+     * 6 = 10368 bytes
+     * 7 = 16384 bytes
+     */
+    uint_reg_t size         : 3;
+    /*
+     * Valid indication for the buffer.  Ignored on writes.
+     * 0 : Valid buffer descriptor popped from stack.
+     * 3 : Could not pop a buffer from the stack.  Either the stack is empty,
+     * or the hardware's prefetch buffer is empty for this stack.
+     */
+    uint_reg_t c            : 2;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t c            : 2;
+    uint_reg_t size         : 3;
+    uint_reg_t hwb          : 1;
+    uint_reg_t __reserved_2 : 5;
+    uint_reg_t stack_idx    : 5;
+    uint_reg_t __reserved_1 : 6;
+    int_reg_t va           : 35;
+    uint_reg_t __reserved_0 : 7;
+#endif
+  };
+
+  uint_reg_t word;
+} MPIPE_BSM_REGION_VAL_t;
+
+/*
+ * MMIO Egress DMA Post Region Address.
+ * Used to post descriptor locations to the eDMA descriptor engine.  The
+ * value to be written is described in EDMA_POST_REGION_VAL
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /* Reserved. */
+    uint_reg_t __reserved_0 : 3;
+    /* eDMA ring being accessed */
+    uint_reg_t ring         : 5;
+    /* Reserved. */
+    uint_reg_t __reserved_1 : 18;
+    /*
+     * This field of the address selects the region (address space) to be
+     * accessed.  For the egress DMA post region, this field must be 5.
+     */
+    uint_reg_t region       : 3;
+    /* Reserved. */
+    uint_reg_t __reserved_2 : 6;
+    /* This field of the address indexes the 32 entry service domain table. */
+    uint_reg_t svc_dom      : 5;
+    /* Reserved. */
+    uint_reg_t __reserved_3 : 24;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved_3 : 24;
+    uint_reg_t svc_dom      : 5;
+    uint_reg_t __reserved_2 : 6;
+    uint_reg_t region       : 3;
+    uint_reg_t __reserved_1 : 18;
+    uint_reg_t ring         : 5;
+    uint_reg_t __reserved_0 : 3;
+#endif
+  };
+
+  uint_reg_t word;
+} MPIPE_EDMA_POST_REGION_ADDR_t;
+
+/*
+ * MMIO Egress DMA Post Region Value.
+ * Used to post descriptor locations to the eDMA descriptor engine.  The
+ * address is described in EDMA_POST_REGION_ADDR.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /*
+     * For writes, this specifies the current ring tail pointer prior to any
+     * post.  For example, to post 1 or more descriptors starting at location
+     * 23, this would contain 23 (not 24).  On writes, this index must be
+     * masked based on the ring size.  The new tail pointer after this post
+     * is COUNT+RING_IDX (masked by the ring size).
+     *
+     * For reads, this provides the hardware descriptor fetcher's head
+     * pointer.  The descriptors prior to the head pointer, however, may not
+     * yet have been processed so this indicator is only used to determine
+     * how full the ring is and if software may post more descriptors.
+     */
+    uint_reg_t ring_idx   : 16;
+    /*
+     * For writes, this specifies number of contiguous descriptors that are
+     * being posted.  Software may post up to RingSize descriptors with a
+     * single MMIO store.  A zero in this field on a write will "wake up" an
+     * eDMA ring and cause it fetch descriptors regardless of the hardware's
+     * current view of the state of the tail pointer.
+     *
+     * For reads, this field provides a rolling count of the number of
+     * descriptors that have been completely processed.  This may be used by
+     * software to determine when buffers associated with a descriptor may be
+     * returned or reused.  When the ring's flush bit is cleared by software
+     * (after having been set by HW or SW), the COUNT will be cleared.
+     */
+    uint_reg_t count      : 16;
+    /*
+     * For writes, this specifies the generation number of the tail being
+     * posted. Note that if tail+cnt wraps to the beginning of the ring, the
+     * eDMA hardware assumes that the descriptors posted at the beginning of
+     * the ring are also valid so it is okay to post around the wrap point.
+     *
+     * For reads, this is the current generation number.  Valid descriptors
+     * will have the inverse of this generation number.
+     */
+    uint_reg_t gen        : 1;
+    /* Reserved. */
+    uint_reg_t __reserved : 31;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved : 31;
+    uint_reg_t gen        : 1;
+    uint_reg_t count      : 16;
+    uint_reg_t ring_idx   : 16;
+#endif
+  };
+
+  uint_reg_t word;
+} MPIPE_EDMA_POST_REGION_VAL_t;
+
+/*
+ * Load Balancer Bucket Status Data.
+ * Read/Write data for load balancer Bucket-Status Table. 4160 entries
+ * indexed by LBL_INIT_CTL.IDX when LBL_INIT_CTL.STRUCT_SEL is BSTS_TBL
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /* NotifRing currently assigned to this bucket. */
+    uint_reg_t notifring  : 8;
+    /* Current reference count. */
+    uint_reg_t count      : 16;
+    /* Group associated with this bucket. */
+    uint_reg_t group      : 5;
+    /* Mode select for this bucket. */
+    uint_reg_t mode       : 3;
+    /* Reserved. */
+    uint_reg_t __reserved : 32;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved : 32;
+    uint_reg_t mode       : 3;
+    uint_reg_t group      : 5;
+    uint_reg_t count      : 16;
+    uint_reg_t notifring  : 8;
+#endif
+  };
+
+  uint_reg_t word;
+} MPIPE_LBL_INIT_DAT_BSTS_TBL_t;
+#endif /* !defined(__ASSEMBLER__) */
+
+#endif /* !defined(__ARCH_MPIPE_H__) */

arch/tile/include/arch/mpipe_constants.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+
+#ifndef __ARCH_MPIPE_CONSTANTS_H__
+#define __ARCH_MPIPE_CONSTANTS_H__
+
+#define MPIPE_NUM_CLASSIFIERS 10
+#define MPIPE_CLS_MHZ 1200
+
+#define MPIPE_NUM_EDMA_RINGS 32
+
+#define MPIPE_NUM_SGMII_MACS 16
+#define MPIPE_NUM_XAUI_MACS 4
+#define MPIPE_NUM_LOOPBACK_CHANNELS 4
+#define MPIPE_NUM_NON_LB_CHANNELS 28
+
+#define MPIPE_NUM_IPKT_BLOCKS 1536
+
+#define MPIPE_NUM_BUCKETS 4160
+
+#define MPIPE_NUM_NOTIF_RINGS 256
+
+#define MPIPE_NUM_NOTIF_GROUPS 32
+
+#define MPIPE_NUM_TLBS_PER_ASID 16
+#define MPIPE_TLB_IDX_WIDTH 4
+
+#define MPIPE_MMIO_NUM_SVC_DOM 32
+
+#endif /* __ARCH_MPIPE_CONSTANTS_H__ */

arch/tile/include/arch/mpipe_def.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_MPIPE_DEF_H__
+#define __ARCH_MPIPE_DEF_H__
+#define MPIPE_MMIO_ADDR__REGION_SHIFT 26
+#define MPIPE_MMIO_ADDR__REGION_VAL_CFG 0x0
+#define MPIPE_MMIO_ADDR__REGION_VAL_IDMA 0x4
+#define MPIPE_MMIO_ADDR__REGION_VAL_EDMA 0x5
+#define MPIPE_MMIO_ADDR__REGION_VAL_BSM 0x6
+#define MPIPE_BSM_REGION_VAL__VA_SHIFT 7
+#define MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_128 0x0
+#define MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_256 0x1
+#define MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_512 0x2
+#define MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_1024 0x3
+#define MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_1664 0x4
+#define MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_4096 0x5
+#define MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_10368 0x6
+#define MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_16384 0x7
+#define MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_DFA 0x0
+#define MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_FIXED 0x1
+#define MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_ALWAYS_PICK 0x2
+#define MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_STICKY 0x3
+#define MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_STICKY_RAND 0x7
+#define MPIPE_LBL_NR_STATE__FIRST_WORD 0x2138
+#endif /* !defined(__ARCH_MPIPE_DEF_H__) */

arch/tile/include/arch/mpipe_shm.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+
+#ifndef __ARCH_MPIPE_SHM_H__
+#define __ARCH_MPIPE_SHM_H__
+
+#include <arch/abi.h>
+#include <arch/mpipe_shm_def.h>
+
+#ifndef __ASSEMBLER__
+/**
+ * MPIPE eDMA Descriptor.
+ * The eDMA descriptor is written by software and consumed by hardware.  It
+ * is used to specify the location of egress packet data to be sent out of
+ * the chip via one of the packet interfaces.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+    /* Word 0 */
+
+#ifndef __BIG_ENDIAN__
+    /**
+     * Generation number.  Used to indicate a valid descriptor in ring.  When
+     * a new descriptor is written into the ring, software must toggle this
+     * bit.  The net effect is that the GEN bit being written into new
+     * descriptors toggles each time the ring tail pointer wraps.
+     */
+    uint_reg_t gen        : 1;
+    /** Reserved.  Must be zero. */
+    uint_reg_t r0         : 7;
+    /** Checksum generation enabled for this transfer. */
+    uint_reg_t csum       : 1;
+    /**
+     * Nothing to be sent.  Used, for example, when software has dropped a
+     * packet but still wishes to return all of the associated buffers.
+     */
+    uint_reg_t ns         : 1;
+    /**
+     * Notification interrupt will be delivered when packet has been egressed.
+     */
+    uint_reg_t notif      : 1;
+    /**
+     * Boundary indicator.  When 1, this transfer includes the EOP for this
+     * command.  Must be clear on all but the last descriptor for an egress
+     * packet.
+     */
+    uint_reg_t bound      : 1;
+    /** Reserved.  Must be zero. */
+    uint_reg_t r1         : 4;
+    /**
+     * Number of bytes to be sent for this descriptor.  When zero, no data
+     * will be moved and the buffer descriptor will be ignored.  If the
+     * buffer descriptor indicates that it is chained, the low 7 bits of the
+     * VA indicate the offset within the first buffer (e.g. 127 bytes is the
+     * maximum offset into the first buffer).  If the size exceeds a single
+     * buffer, subsequent buffer descriptors will be fetched prior to
+     * processing the next eDMA descriptor in the ring.
+     */
+    uint_reg_t xfer_size  : 14;
+    /** Reserved.  Must be zero. */
+    uint_reg_t r2         : 2;
+    /**
+     * Destination of checksum relative to CSUM_START relative to the first
+     * byte moved by this descriptor.  Must be zero if CSUM=0 in this
+     * descriptor.  Must be less than XFER_SIZE (e.g. the first byte of the
+     * CSUM_DEST must be within the span of this descriptor).
+     */
+    uint_reg_t csum_dest  : 8;
+    /**
+     * Start byte of checksum relative to the first byte moved by this
+     * descriptor.  If this is not the first descriptor for the egress
+     * packet, CSUM_START is still relative to the first byte in this
+     * descriptor.  Must be zero if CSUM=0 in this descriptor.
+     */
+    uint_reg_t csum_start : 8;
+    /**
+     * Initial value for 16-bit 1's compliment checksum if enabled via CSUM.
+     * Specified in network order.  That is, bits[7:0] will be added to the
+     * byte pointed to by CSUM_START and bits[15:8] will be added to the byte
+     * pointed to by CSUM_START+1 (with appropriate 1's compliment carries).
+     * Must be zero if CSUM=0 in this descriptor.
+     */
+    uint_reg_t csum_seed  : 16;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t csum_seed  : 16;
+    uint_reg_t csum_start : 8;
+    uint_reg_t csum_dest  : 8;
+    uint_reg_t r2         : 2;
+    uint_reg_t xfer_size  : 14;
+    uint_reg_t r1         : 4;
+    uint_reg_t bound      : 1;
+    uint_reg_t notif      : 1;
+    uint_reg_t ns         : 1;
+    uint_reg_t csum       : 1;
+    uint_reg_t r0         : 7;
+    uint_reg_t gen        : 1;
+#endif
+
+    /* Word 1 */
+
+#ifndef __BIG_ENDIAN__
+    /** Virtual address.  Must be sign extended by consumer. */
+    int_reg_t va           : 42;
+    /** Reserved. */
+    uint_reg_t __reserved_0 : 6;
+    /** Index of the buffer stack to which this buffer belongs. */
+    uint_reg_t stack_idx    : 5;
+    /** Reserved. */
+    uint_reg_t __reserved_1 : 3;
+    /**
+     * Instance ID.  For devices that support more than one mPIPE instance,
+     * this field indicates the buffer owner.  If the INST field does not
+     * match the mPIPE's instance number when a packet is egressed, buffers
+     * with HWB set will be returned to the other mPIPE instance.
+     */
+    uint_reg_t inst         : 1;
+    /** Reserved. */
+    uint_reg_t __reserved_2 : 1;
+    /**
+     * Always set to one by hardware in iDMA packet descriptors.  For eDMA,
+     * indicates whether the buffer will be released to the buffer stack
+     * manager.  When 0, software is responsible for releasing the buffer.
+     */
+    uint_reg_t hwb          : 1;
+    /**
+     * Encoded size of buffer.  Set by the ingress hardware for iDMA packet
+     * descriptors.  For eDMA descriptors, indicates the buffer size if .c
+     * indicates a chained packet.  If an eDMA descriptor is not chained and
+     * the .hwb bit is not set, this field is ignored and the size is
+     * specified by the .xfer_size field.
+     * 0 = 128 bytes
+     * 1 = 256 bytes
+     * 2 = 512 bytes
+     * 3 = 1024 bytes
+     * 4 = 1664 bytes
+     * 5 = 4096 bytes
+     * 6 = 10368 bytes
+     * 7 = 16384 bytes
+     */
+    uint_reg_t size         : 3;
+    /**
+     * Chaining configuration for the buffer.  Indicates that an ingress
+     * packet or egress command is chained across multiple buffers, with each
+     * buffer's size indicated by the .size field.
+     */
+    uint_reg_t c            : 2;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t c            : 2;
+    uint_reg_t size         : 3;
+    uint_reg_t hwb          : 1;
+    uint_reg_t __reserved_2 : 1;
+    uint_reg_t inst         : 1;
+    uint_reg_t __reserved_1 : 3;
+    uint_reg_t stack_idx    : 5;
+    uint_reg_t __reserved_0 : 6;
+    int_reg_t va           : 42;
+#endif
+
+  };
+
+  /** Word access */
+  uint_reg_t words[2];
+} MPIPE_EDMA_DESC_t;
+
+/**
+ * MPIPE Packet Descriptor.
+ * The packet descriptor is filled by the mPIPE's classification,
+ * load-balancing, and buffer management services.  Some fields are consumed
+ * by mPIPE hardware, and others are consumed by Tile software.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+    /* Word 0 */
+
+#ifndef __BIG_ENDIAN__
+    /**
+     * Notification ring into which this packet descriptor is written.
+     * Typically written by load balancer, but can be overridden by
+     * classification program if NR is asserted.
+     */
+    uint_reg_t notif_ring   : 8;
+    /** Source channel for this packet.  Written by mPIPE DMA hardware. */
+    uint_reg_t channel      : 5;
+    /** Reserved. */
+    uint_reg_t __reserved_0 : 1;
+    /**
+     * MAC Error.
+     * Generated by the MAC interface.  Asserted if there was an overrun of
+     * the MAC's receive FIFO.  This condition generally only occurs if the
+     * mPIPE clock is running too slowly.
+     */
+    uint_reg_t me           : 1;
+    /**
+     * Truncation Error.
+     * Written by the iDMA hardware.  Asserted if packet was truncated due to
+     * insufficient space in iPkt buffer
+     */
+    uint_reg_t tr           : 1;
+    /**
+     * Written by the iDMA hardware.  Indicates the number of bytes written
+     * to Tile memory.  In general, this is the actual size of the packet as
+     * received from the MAC.  But if the packet is truncated due to running
+     * out of buffers or due to the iPkt buffer filling up, then the L2_SIZE
+     * will be reduced to reflect the actual number of valid bytes written to
+     * Tile memory.
+     */
+    uint_reg_t l2_size      : 14;
+    /**
+     * CRC Error.
+     * Generated by the MAC.  Asserted if MAC indicated an L2 CRC error or
+     * other L2 error (bad length etc.) on the packet.
+     */
+    uint_reg_t ce           : 1;
+    /**
+     * Cut Through.
+     * Written by the iDMA hardware.  Asserted if packet was not completely
+     * received before being sent to classifier.  L2_Size will indicate
+     * number of bytes received so far.
+     */
+    uint_reg_t ct           : 1;
+    /**
+     * Written by the classification program.  Used by the load balancer to
+     * select the ring into which this packet descriptor is written.
+     */
+    uint_reg_t bucket_id    : 13;
+    /** Reserved. */
+    uint_reg_t __reserved_1 : 3;
+    /**
+     * Checksum.
+     * Written by classification program.  When 1, the checksum engine will
+     * perform checksum based on the CSUM_SEED, CSUM_START, and CSUM_BYTES
+     * fields.  The result will be placed in CSUM_VAL.
+     */
+    uint_reg_t cs           : 1;
+    /**
+     * Notification Ring Select.
+     * Written by the classification program.  When 1, the NotifRingIDX is
+     * set by classification program rather than being set by load balancer.
+     */
+    uint_reg_t nr           : 1;
+    /**
+     * Written by classification program.  Indicates whether packet and
+     * descriptor should both be dropped, both be delivered, or only the
+     * descriptor should be delivered.
+     */
+    uint_reg_t dest         : 2;
+    /**
+     * General Purpose Sequence Number Enable.
+     * Written by the classification program.  When 1, the GP_SQN_SEL field
+     * contains the sequence number selector and the GP_SQN field will be
+     * replaced with the associated sequence number.  When clear, the GP_SQN
+     * field is left intact and be used as "Custom" bytes.
+     */
+    uint_reg_t sq           : 1;
+    /**
+     * TimeStamp Enable.
+     * Enable TimeStamp insertion.  When clear, timestamp field may be filled
+     * with custom data by classifier.  When set, hardware inserts the
+     * timestamp when the start of packet is received from the MAC.
+     */
+    uint_reg_t ts           : 1;
+    /**
+     * Packet Sequence Number Enable.
+     * Enable PacketSQN insertion.  When clear, PacketSQN field may be filled
+     * with custom data by classifier.  When set, hardware inserts the packet
+     * sequence number when the packet descriptor is written to a
+     * notification ring.
+     */
+    uint_reg_t ps           : 1;
+    /**
+     * Buffer Error.
+     * Written by the iDMA hardware.  Asserted if iDMA ran out of buffers
+     * while writing the packet. Software must still return any buffer
+     * descriptors whose C field indicates a valid descriptor was consumed.
+     */
+    uint_reg_t be           : 1;
+    /**
+     * Written by  the classification program.  The associated counter is
+     * incremented when the packet is sent.
+     */
+    uint_reg_t ctr0         : 5;
+    /** Reserved. */
+    uint_reg_t __reserved_2 : 3;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved_2 : 3;
+    uint_reg_t ctr0         : 5;
+    uint_reg_t be           : 1;
+    uint_reg_t ps           : 1;
+    uint_reg_t ts           : 1;
+    uint_reg_t sq           : 1;
+    uint_reg_t dest         : 2;
+    uint_reg_t nr           : 1;
+    uint_reg_t cs           : 1;
+    uint_reg_t __reserved_1 : 3;
+    uint_reg_t bucket_id    : 13;
+    uint_reg_t ct           : 1;
+    uint_reg_t ce           : 1;
+    uint_reg_t l2_size      : 14;
+    uint_reg_t tr           : 1;
+    uint_reg_t me           : 1;
+    uint_reg_t __reserved_0 : 1;
+    uint_reg_t channel      : 5;
+    uint_reg_t notif_ring   : 8;
+#endif
+
+    /* Word 1 */
+
+#ifndef __BIG_ENDIAN__
+    /**
+     * Written by  the classification program.  The associated counter is
+     * incremented when the packet is sent.
+     */
+    uint_reg_t ctr1          : 5;
+    /** Reserved. */
+    uint_reg_t __reserved_3  : 3;
+    /**
+     * Written by classification program.  Indicates the start byte for
+     * checksum.  Relative to 1st byte received from MAC.
+     */
+    uint_reg_t csum_start    : 8;
+    /**
+     * Checksum seed written by classification program.  Overwritten with
+     * resultant checksum if CS bit is asserted.  The endianness of the CSUM
+     * value bits when viewed by Tile software match the packet byte order.
+     * That is, bits[7:0] of the resulting checksum value correspond to
+     * earlier (more significant) bytes in the packet.  To avoid classifier
+     * software from having to byte swap the CSUM_SEED, the iDMA checksum
+     * engine byte swaps the classifier's result before seeding the checksum
+     * calculation.  Thus, the CSUM_START byte of packet data is added to
+     * bits[15:8] of the CSUM_SEED field generated by the classifier.  This
+     * byte swap will be visible to Tile software if the CS bit is clear.
+     */
+    uint_reg_t csum_seed_val : 16;
+    /**
+     * Written by  the classification program.  Not interpreted by mPIPE
+     * hardware.
+     */
+    uint_reg_t custom0       : 32;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t custom0       : 32;
+    uint_reg_t csum_seed_val : 16;
+    uint_reg_t csum_start    : 8;
+    uint_reg_t __reserved_3  : 3;
+    uint_reg_t ctr1          : 5;
+#endif
+
+    /* Word 2 */
+
+#ifndef __BIG_ENDIAN__
+    /**
+     * Written by  the classification program.  Not interpreted by mPIPE
+     * hardware.
+     */
+    uint_reg_t custom1 : 64;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t custom1 : 64;
+#endif
+
+    /* Word 3 */
+
+#ifndef __BIG_ENDIAN__
+    /**
+     * Written by  the classification program.  Not interpreted by mPIPE
+     * hardware.
+     */
+    uint_reg_t custom2 : 64;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t custom2 : 64;
+#endif
+
+    /* Word 4 */
+
+#ifndef __BIG_ENDIAN__
+    /**
+     * Written by  the classification program.  Not interpreted by mPIPE
+     * hardware.
+     */
+    uint_reg_t custom3 : 64;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t custom3 : 64;
+#endif
+
+    /* Word 5 */
+
+#ifndef __BIG_ENDIAN__
+    /**
+     * Sequence number applied when packet is distributed.   Classifier
+     * selects which sequence number is to be applied by writing the 13-bit
+     * SQN-selector into this field.
+     */
+    uint_reg_t gp_sqn     : 16;
+    /**
+     * Written by notification hardware.  The packet sequence number is
+     * incremented for each packet that wasn't dropped.
+     */
+    uint_reg_t packet_sqn : 48;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t packet_sqn : 48;
+    uint_reg_t gp_sqn     : 16;
+#endif
+
+    /* Word 6 */
+
+#ifndef __BIG_ENDIAN__
+    /**
+     * Written by hardware when the start-of-packet is received by the mPIPE
+     * from the MAC.  This is the nanoseconds part of the packet timestamp.
+     */
+    uint_reg_t time_stamp_ns  : 32;
+    /**
+     * Written by hardware when the start-of-packet is received by the mPIPE
+     * from the MAC.  This is the seconds part of the packet timestamp.
+     */
+    uint_reg_t time_stamp_sec : 32;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t time_stamp_sec : 32;
+    uint_reg_t time_stamp_ns  : 32;
+#endif
+
+    /* Word 7 */
+
+#ifndef __BIG_ENDIAN__
+    /** Virtual address.  Must be sign extended by consumer. */
+    int_reg_t va           : 42;
+    /** Reserved. */
+    uint_reg_t __reserved_4 : 6;
+    /** Index of the buffer stack to which this buffer belongs. */
+    uint_reg_t stack_idx    : 5;
+    /** Reserved. */
+    uint_reg_t __reserved_5 : 3;
+    /**
+     * Instance ID.  For devices that support more than one mPIPE instance,
+     * this field indicates the buffer owner.  If the INST field does not
+     * match the mPIPE's instance number when a packet is egressed, buffers
+     * with HWB set will be returned to the other mPIPE instance.
+     */
+    uint_reg_t inst         : 1;
+    /** Reserved. */
+    uint_reg_t __reserved_6 : 1;
+    /**
+     * Always set to one by hardware in iDMA packet descriptors.  For eDMA,
+     * indicates whether the buffer will be released to the buffer stack
+     * manager.  When 0, software is responsible for releasing the buffer.
+     */
+    uint_reg_t hwb          : 1;
+    /**
+     * Encoded size of buffer.  Set by the ingress hardware for iDMA packet
+     * descriptors.  For eDMA descriptors, indicates the buffer size if .c
+     * indicates a chained packet.  If an eDMA descriptor is not chained and
+     * the .hwb bit is not set, this field is ignored and the size is
+     * specified by the .xfer_size field.
+     * 0 = 128 bytes
+     * 1 = 256 bytes
+     * 2 = 512 bytes
+     * 3 = 1024 bytes
+     * 4 = 1664 bytes
+     * 5 = 4096 bytes
+     * 6 = 10368 bytes
+     * 7 = 16384 bytes
+     */
+    uint_reg_t size         : 3;
+    /**
+     * Chaining configuration for the buffer.  Indicates that an ingress
+     * packet or egress command is chained across multiple buffers, with each
+     * buffer's size indicated by the .size field.
+     */
+    uint_reg_t c            : 2;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t c            : 2;
+    uint_reg_t size         : 3;
+    uint_reg_t hwb          : 1;
+    uint_reg_t __reserved_6 : 1;
+    uint_reg_t inst         : 1;
+    uint_reg_t __reserved_5 : 3;
+    uint_reg_t stack_idx    : 5;
+    uint_reg_t __reserved_4 : 6;
+    int_reg_t va           : 42;
+#endif
+
+  };
+
+  /** Word access */
+  uint_reg_t words[8];
+} MPIPE_PDESC_t;
+#endif /* !defined(__ASSEMBLER__) */
+
+#endif /* !defined(__ARCH_MPIPE_SHM_H__) */

arch/tile/include/arch/mpipe_shm_def.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_MPIPE_SHM_DEF_H__
+#define __ARCH_MPIPE_SHM_DEF_H__
+#define MPIPE_EDMA_DESC_WORD1__C_VAL_UNCHAINED 0x0
+#define MPIPE_EDMA_DESC_WORD1__C_VAL_CHAINED 0x1
+#define MPIPE_EDMA_DESC_WORD1__C_VAL_NOT_RDY 0x2
+#define MPIPE_EDMA_DESC_WORD1__C_VAL_INVALID 0x3
+#endif /* !defined(__ARCH_MPIPE_SHM_DEF_H__) */

arch/tile/include/arch/trio.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_TRIO_H__
+#define __ARCH_TRIO_H__
+
+#include <arch/abi.h>
+#include <arch/trio_def.h>
+
+#ifndef __ASSEMBLER__
+
+/*
+ * Tile PIO Region Configuration - CFG Address Format.
+ * This register describes the address format for PIO accesses when the
+ * associated region is setup with TYPE=CFG.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /* Register Address (full byte address). */
+    uint_reg_t reg_addr     : 12;
+    /* Function Number */
+    uint_reg_t fn           : 3;
+    /* Device Number */
+    uint_reg_t dev          : 5;
+    /* BUS Number */
+    uint_reg_t bus          : 8;
+    /* Config Type: 0 for access to directly-attached device.  1 otherwise. */
+    uint_reg_t type         : 1;
+    /* Reserved. */
+    uint_reg_t __reserved_0 : 1;
+    /*
+     * MAC select.  This must match the configuration in
+     * TILE_PIO_REGION_SETUP.MAC.
+     */
+    uint_reg_t mac          : 2;
+    /* Reserved. */
+    uint_reg_t __reserved_1 : 32;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved_1 : 32;
+    uint_reg_t mac          : 2;
+    uint_reg_t __reserved_0 : 1;
+    uint_reg_t type         : 1;
+    uint_reg_t bus          : 8;
+    uint_reg_t dev          : 5;
+    uint_reg_t fn           : 3;
+    uint_reg_t reg_addr     : 12;
+#endif
+  };
+
+  uint_reg_t word;
+} TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR_t;
+#endif /* !defined(__ASSEMBLER__) */
+
+#endif /* !defined(__ARCH_TRIO_H__) */

arch/tile/include/arch/trio_constants.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+
+#ifndef __ARCH_TRIO_CONSTANTS_H__
+#define __ARCH_TRIO_CONSTANTS_H__
+
+#define TRIO_NUM_ASIDS 16
+#define TRIO_NUM_TLBS_PER_ASID 16
+
+#define TRIO_NUM_TPIO_REGIONS 8
+#define TRIO_LOG2_NUM_TPIO_REGIONS 3
+
+#define TRIO_NUM_MAP_MEM_REGIONS 16
+#define TRIO_LOG2_NUM_MAP_MEM_REGIONS 4
+#define TRIO_NUM_MAP_SQ_REGIONS 8
+#define TRIO_LOG2_NUM_MAP_SQ_REGIONS 3
+
+#define TRIO_LOG2_NUM_SQ_FIFO_ENTRIES 6
+
+#define TRIO_NUM_PUSH_DMA_RINGS 32
+
+#define TRIO_NUM_PULL_DMA_RINGS 32
+
+#endif /* __ARCH_TRIO_CONSTANTS_H__ */

arch/tile/include/arch/trio_def.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_TRIO_DEF_H__
+#define __ARCH_TRIO_DEF_H__
+#define TRIO_CFG_REGION_ADDR__REG_SHIFT 0
+#define TRIO_CFG_REGION_ADDR__INTFC_SHIFT 16
+#define TRIO_CFG_REGION_ADDR__INTFC_VAL_TRIO 0x0
+#define TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE 0x1
+#define TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD 0x2
+#define TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_PROTECTED 0x3
+#define TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT 18
+#define TRIO_CFG_REGION_ADDR__PROT_SHIFT 20
+#define TRIO_PIO_REGIONS_ADDR__REGION_SHIFT 32
+#define TRIO_MAP_MEM_REG_INT0 0x1000000000
+#define TRIO_MAP_MEM_REG_INT1 0x1000000008
+#define TRIO_MAP_MEM_REG_INT2 0x1000000010
+#define TRIO_MAP_MEM_REG_INT3 0x1000000018
+#define TRIO_MAP_MEM_REG_INT4 0x1000000020
+#define TRIO_MAP_MEM_REG_INT5 0x1000000028
+#define TRIO_MAP_MEM_REG_INT6 0x1000000030
+#define TRIO_MAP_MEM_REG_INT7 0x1000000038
+#define TRIO_MAP_MEM_LIM__ADDR_SHIFT 12
+#define TRIO_MAP_MEM_SETUP__ORDER_MODE_VAL_UNORDERED 0x0
+#define TRIO_MAP_MEM_SETUP__ORDER_MODE_VAL_STRICT 0x1
+#define TRIO_MAP_MEM_SETUP__ORDER_MODE_VAL_REL_ORD 0x2
+#define TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT 30
+#endif /* !defined(__ARCH_TRIO_DEF_H__) */

arch/tile/include/arch/trio_pcie_intfc.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_TRIO_PCIE_INTFC_H__
+#define __ARCH_TRIO_PCIE_INTFC_H__
+
+#include <arch/abi.h>
+#include <arch/trio_pcie_intfc_def.h>
+
+#ifndef __ASSEMBLER__
+
+/*
+ * Port Configuration.
+ * Configuration of the PCIe Port
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /* Provides the state of the strapping pins for this port. */
+    uint_reg_t strap_state      : 3;
+    /* Reserved. */
+    uint_reg_t __reserved_0     : 1;
+    /*
+     * When 1, the device type will be overridden using OVD_DEV_TYPE_VAL.
+     * When 0, the device type is determined based on the STRAP_STATE.
+     */
+    uint_reg_t ovd_dev_type     : 1;
+    /* Provides the device type when OVD_DEV_TYPE is 1. */
+    uint_reg_t ovd_dev_type_val : 4;
+    /* Determines how link is trained. */
+    uint_reg_t train_mode       : 2;
+    /* Reserved. */
+    uint_reg_t __reserved_1     : 1;
+    /*
+     * For PCIe, used to flip physical RX lanes that were not properly wired.
+     *  This is not the same as lane reversal which is handled automatically
+     * during link training.  When 0, RX Lane0 must be wired to the link
+     * partner (either to its Lane0 or it's LaneN).  When RX_LANE_FLIP is 1,
+     * the highest numbered lane for this port becomes Lane0 and Lane0 does
+     * NOT have to be wired to the link partner.
+     */
+    uint_reg_t rx_lane_flip     : 1;
+    /*
+     * For PCIe, used to flip physical TX lanes that were not properly wired.
+     *  This is not the same as lane reversal which is handled automatically
+     * during link training.  When 0, TX Lane0 must be wired to the link
+     * partner (either to its Lane0 or it's LaneN).  When TX_LANE_FLIP is 1,
+     * the highest numbered lane for this port becomes Lane0 and Lane0 does
+     * NOT have to be wired to the link partner.
+     */
+    uint_reg_t tx_lane_flip     : 1;
+    /*
+     * For StreamIO port, configures the width of the port when TRAIN_MODE is
+     * not STRAP.
+     */
+    uint_reg_t stream_width     : 2;
+    /*
+     * For StreamIO port, configures the rate of the port when TRAIN_MODE is
+     * not STRAP.
+     */
+    uint_reg_t stream_rate      : 2;
+    /* Reserved. */
+    uint_reg_t __reserved_2     : 46;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved_2     : 46;
+    uint_reg_t stream_rate      : 2;
+    uint_reg_t stream_width     : 2;
+    uint_reg_t tx_lane_flip     : 1;
+    uint_reg_t rx_lane_flip     : 1;
+    uint_reg_t __reserved_1     : 1;
+    uint_reg_t train_mode       : 2;
+    uint_reg_t ovd_dev_type_val : 4;
+    uint_reg_t ovd_dev_type     : 1;
+    uint_reg_t __reserved_0     : 1;
+    uint_reg_t strap_state      : 3;
+#endif
+  };
+
+  uint_reg_t word;
+} TRIO_PCIE_INTFC_PORT_CONFIG_t;
+
+/*
+ * Port Status.
+ * Status of the PCIe Port.  This register applies to the StreamIO port when
+ * StreamIO is enabled.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /*
+     * Indicates the DL state of the port.  When 1, the port is up and ready
+     * to receive traffic.
+     */
+    uint_reg_t dl_up        : 1;
+    /*
+     * Indicates the number of times the link has gone down.  Clears on read.
+     */
+    uint_reg_t dl_down_cnt  : 7;
+    /* Indicates the SERDES PLL has spun up and is providing a valid clock. */
+    uint_reg_t clock_ready  : 1;
+    /* Reserved. */
+    uint_reg_t __reserved_0 : 7;
+    /* Device revision ID. */
+    uint_reg_t device_rev   : 8;
+    /* Link state (PCIe). */
+    uint_reg_t ltssm_state  : 6;
+    /* Link power management state (PCIe). */
+    uint_reg_t pm_state     : 3;
+    /* Reserved. */
+    uint_reg_t __reserved_1 : 31;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved_1 : 31;
+    uint_reg_t pm_state     : 3;
+    uint_reg_t ltssm_state  : 6;
+    uint_reg_t device_rev   : 8;
+    uint_reg_t __reserved_0 : 7;
+    uint_reg_t clock_ready  : 1;
+    uint_reg_t dl_down_cnt  : 7;
+    uint_reg_t dl_up        : 1;
+#endif
+  };
+
+  uint_reg_t word;
+} TRIO_PCIE_INTFC_PORT_STATUS_t;
+
+/*
+ * Transmit FIFO Control.
+ * Contains TX FIFO thresholds.  These registers are for diagnostics purposes
+ * only.  Changing these values causes undefined behavior.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /*
+     * Almost-Empty level for TX0 data.  Typically set to at least
+     * roundup(38.0*M/N) where N=tclk frequency and M=MAC symbol rate in MHz
+     * for a x4 port (250MHz).
+     */
+    uint_reg_t tx0_data_ae_lvl : 7;
+    /* Reserved. */
+    uint_reg_t __reserved_0    : 1;
+    /* Almost-Empty level for TX1 data. */
+    uint_reg_t tx1_data_ae_lvl : 7;
+    /* Reserved. */
+    uint_reg_t __reserved_1    : 1;
+    /* Almost-Full level for TX0 data. */
+    uint_reg_t tx0_data_af_lvl : 7;
+    /* Reserved. */
+    uint_reg_t __reserved_2    : 1;
+    /* Almost-Full level for TX1 data. */
+    uint_reg_t tx1_data_af_lvl : 7;
+    /* Reserved. */
+    uint_reg_t __reserved_3    : 1;
+    /* Almost-Full level for TX0 info. */
+    uint_reg_t tx0_info_af_lvl : 5;
+    /* Reserved. */
+    uint_reg_t __reserved_4    : 3;
+    /* Almost-Full level for TX1 info. */
+    uint_reg_t tx1_info_af_lvl : 5;
+    /* Reserved. */
+    uint_reg_t __reserved_5    : 3;
+    /*
+     * This register provides performance adjustment for high bandwidth
+     * flows.  The MAC will assert almost-full to TRIO if non-posted credits
+     * fall below this level.  Note that setting this larger than the initial
+     * PORT_CREDIT.NPH value will cause READS to never be sent.  If the
+     * initial credit value from the link partner is smaller than this value
+     * when the link comes up, the value will be reset to the initial credit
+     * value to prevent lockup.
+     */
+    uint_reg_t min_np_credits  : 8;
+    /*
+     * This register provides performance adjustment for high bandwidth
+     * flows.  The MAC will assert almost-full to TRIO if posted credits fall
+     * below this level.  Note that setting this larger than the initial
+     * PORT_CREDIT.PH value will cause WRITES to never be sent.  If the
+     * initial credit value from the link partner is smaller than this value
+     * when the link comes up, the value will be reset to the initial credit
+     * value to prevent lockup.
+     */
+    uint_reg_t min_p_credits   : 8;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t min_p_credits   : 8;
+    uint_reg_t min_np_credits  : 8;
+    uint_reg_t __reserved_5    : 3;
+    uint_reg_t tx1_info_af_lvl : 5;
+    uint_reg_t __reserved_4    : 3;
+    uint_reg_t tx0_info_af_lvl : 5;
+    uint_reg_t __reserved_3    : 1;
+    uint_reg_t tx1_data_af_lvl : 7;
+    uint_reg_t __reserved_2    : 1;
+    uint_reg_t tx0_data_af_lvl : 7;
+    uint_reg_t __reserved_1    : 1;
+    uint_reg_t tx1_data_ae_lvl : 7;
+    uint_reg_t __reserved_0    : 1;
+    uint_reg_t tx0_data_ae_lvl : 7;
+#endif
+  };
+
+  uint_reg_t word;
+} TRIO_PCIE_INTFC_TX_FIFO_CTL_t;
+#endif /* !defined(__ASSEMBLER__) */
+
+#endif /* !defined(__ARCH_TRIO_PCIE_INTFC_H__) */

arch/tile/include/arch/trio_pcie_intfc_def.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_TRIO_PCIE_INTFC_DEF_H__
+#define __ARCH_TRIO_PCIE_INTFC_DEF_H__
+#define TRIO_PCIE_INTFC_MAC_INT_STS 0x0000
+#define TRIO_PCIE_INTFC_MAC_INT_STS__INT_LEVEL_MASK  0xf000
+#define TRIO_PCIE_INTFC_PORT_CONFIG 0x0018
+#define TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_DISABLED 0x0
+#define TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_ENDPOINT 0x1
+#define TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_RC 0x2
+#define TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_ENDPOINT_G1 0x3
+#define TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_RC_G1 0x4
+#define TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_XLINK 0x5
+#define TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_STREAM_X1 0x6
+#define TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_STREAM_X4 0x7
+#define TRIO_PCIE_INTFC_PORT_STATUS 0x0020
+#define TRIO_PCIE_INTFC_TX_FIFO_CTL 0x0050
+#endif /* !defined(__ARCH_TRIO_PCIE_INTFC_DEF_H__) */

arch/tile/include/arch/trio_pcie_rc.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_TRIO_PCIE_RC_H__
+#define __ARCH_TRIO_PCIE_RC_H__
+
+#include <arch/abi.h>
+#include <arch/trio_pcie_rc_def.h>
+
+#ifndef __ASSEMBLER__
+
+/* Device Capabilities Register. */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /*
+     * Max_Payload_Size Supported, writablethrough the MAC_STANDARD interface
+     */
+    uint_reg_t mps_sup                    : 3;
+    /*
+     * This field is writable through the MAC_STANDARD interface.  However,
+     * Phantom Function is not  supported. Therefore, the application must
+     * not write any value other than 0x0 to this  field.
+     */
+    uint_reg_t phantom_function_supported : 2;
+    /* This bit is writable through the MAC_STANDARD interface. */
+    uint_reg_t ext_tag_field_supported    : 1;
+    /* Reserved. */
+    uint_reg_t __reserved_0               : 3;
+    /* Endpoint L1 Acceptable Latency Must be 0x0 for non-Endpoint devices. */
+    uint_reg_t l1_lat                     : 3;
+    /*
+     * Undefined since PCI Express 1.1 (Was Attention Button Present for PCI
+     * Express 1.0a)
+     */
+    uint_reg_t r1                         : 1;
+    /*
+     * Undefined since PCI Express 1.1 (Was Attention Indicator Present for
+     * PCI  Express 1.0a)
+     */
+    uint_reg_t r2                         : 1;
+    /*
+     * Undefined since PCI Express 1.1 (Was Power Indicator Present for PCI
+     * Express 1.0a)
+     */
+    uint_reg_t r3                         : 1;
+    /*
+     * Role-Based Error Reporting, writable through the MAC_STANDARD
+     * interface.  Required to be set for device compliant to 1.1  spec and
+     * later.
+     */
+    uint_reg_t rer                        : 1;
+    /* Reserved. */
+    uint_reg_t __reserved_1               : 2;
+    /* Captured Slot Power Limit Value Upstream port only. */
+    uint_reg_t slot_pwr_lim               : 8;
+    /* Captured Slot Power Limit Scale Upstream port only. */
+    uint_reg_t slot_pwr_scale             : 2;
+    /* Reserved. */
+    uint_reg_t __reserved_2               : 4;
+    /* Endpoint L0s Acceptable LatencyMust be 0x0 for non-Endpoint devices. */
+    uint_reg_t l0s_lat                    : 1;
+    /* Reserved. */
+    uint_reg_t __reserved_3               : 31;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved_3               : 31;
+    uint_reg_t l0s_lat                    : 1;
+    uint_reg_t __reserved_2               : 4;
+    uint_reg_t slot_pwr_scale             : 2;
+    uint_reg_t slot_pwr_lim               : 8;
+    uint_reg_t __reserved_1               : 2;
+    uint_reg_t rer                        : 1;
+    uint_reg_t r3                         : 1;
+    uint_reg_t r2                         : 1;
+    uint_reg_t r1                         : 1;
+    uint_reg_t l1_lat                     : 3;
+    uint_reg_t __reserved_0               : 3;
+    uint_reg_t ext_tag_field_supported    : 1;
+    uint_reg_t phantom_function_supported : 2;
+    uint_reg_t mps_sup                    : 3;
+#endif
+  };
+
+  uint_reg_t word;
+} TRIO_PCIE_RC_DEVICE_CAP_t;
+
+/* Device Control Register. */
+
+__extension__
+typedef union
+{
+  struct
+  {
+#ifndef __BIG_ENDIAN__
+    /* Correctable Error Reporting Enable */
+    uint_reg_t cor_err_ena      : 1;
+    /* Non-Fatal Error Reporting Enable */
+    uint_reg_t nf_err_ena       : 1;
+    /* Fatal Error Reporting Enable */
+    uint_reg_t fatal_err_ena    : 1;
+    /* Unsupported Request Reporting Enable */
+    uint_reg_t ur_ena           : 1;
+    /* Relaxed orderring enable */
+    uint_reg_t ro_ena           : 1;
+    /* Max Payload Size */
+    uint_reg_t max_payload_size : 3;
+    /* Extended Tag Field Enable */
+    uint_reg_t ext_tag          : 1;
+    /* Phantom Function Enable */
+    uint_reg_t ph_fn_ena        : 1;
+    /* AUX Power PM Enable */
+    uint_reg_t aux_pm_ena       : 1;
+    /* Enable NoSnoop */
+    uint_reg_t no_snoop         : 1;
+    /* Max read request size */
+    uint_reg_t max_read_req_sz  : 3;
+    /* Reserved. */
+    uint_reg_t __reserved       : 49;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t __reserved       : 49;
+    uint_reg_t max_read_req_sz  : 3;
+    uint_reg_t no_snoop         : 1;
+    uint_reg_t aux_pm_ena       : 1;
+    uint_reg_t ph_fn_ena        : 1;
+    uint_reg_t ext_tag          : 1;
+    uint_reg_t max_payload_size : 3;
+    uint_reg_t ro_ena           : 1;
+    uint_reg_t ur_ena           : 1;
+    uint_reg_t fatal_err_ena    : 1;
+    uint_reg_t nf_err_ena       : 1;
+    uint_reg_t cor_err_ena      : 1;
+#endif
+  };
+
+  uint_reg_t word;
+} TRIO_PCIE_RC_DEVICE_CONTROL_t;
+#endif /* !defined(__ASSEMBLER__) */
+
+#endif /* !defined(__ARCH_TRIO_PCIE_RC_H__) */

arch/tile/include/arch/trio_pcie_rc_def.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_TRIO_PCIE_RC_DEF_H__
+#define __ARCH_TRIO_PCIE_RC_DEF_H__
+#define TRIO_PCIE_RC_DEVICE_CAP 0x0074
+#define TRIO_PCIE_RC_DEVICE_CONTROL 0x0078
+#define TRIO_PCIE_RC_DEVICE_ID_VEN_ID 0x0000
+#define TRIO_PCIE_RC_DEVICE_ID_VEN_ID__DEV_ID_SHIFT 16
+#define TRIO_PCIE_RC_REVISION_ID 0x0008
+#endif /* !defined(__ARCH_TRIO_PCIE_RC_DEF_H__) */

arch/tile/include/arch/trio_shm.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+
+#ifndef __ARCH_TRIO_SHM_H__
+#define __ARCH_TRIO_SHM_H__
+
+#include <arch/abi.h>
+#include <arch/trio_shm_def.h>
+
+#ifndef __ASSEMBLER__
+/**
+ * TRIO DMA Descriptor.
+ * The TRIO DMA descriptor is written by software and consumed by hardware.
+ * It is used to specify the location of transaction data in the IO and Tile
+ * domains.
+ */
+
+__extension__
+typedef union
+{
+  struct
+  {
+    /* Word 0 */
+
+#ifndef __BIG_ENDIAN__
+    /** Tile side virtual address. */
+    int_reg_t va           : 42;
+    /**
+     * Encoded size of buffer used on push DMA when C=1:
+     * 0 = 128 bytes
+     * 1 = 256 bytes
+     * 2 = 512 bytes
+     * 3 = 1024 bytes
+     * 4 = 1664 bytes
+     * 5 = 4096 bytes
+     * 6 = 10368 bytes
+     * 7 = 16384 bytes
+     */
+    uint_reg_t bsz          : 3;
+    /**
+     * Chaining designation.  Always zero for pull DMA
+     * 0 : Unchained buffer pointer
+     * 1 : Chained buffer pointer.  Next buffer descriptor (e.g. VA) stored
+     * in 1st 8-bytes in buffer.  For chained buffers, first 8-bytes of each
+     * buffer contain the next buffer descriptor formatted exactly like a PDE
+     * buffer descriptor.  This allows a chained PDE buffer to be sent using
+     * push DMA.
+     */
+    uint_reg_t c            : 1;
+    /**
+     * Notification interrupt will be delivered when the transaction has
+     * completed (all data has been read from or written to the Tile-side
+     * buffer).
+     */
+    uint_reg_t notif        : 1;
+    /**
+     * When 0, the XSIZE field specifies the total byte count for the
+     * transaction.  When 1, the XSIZE field is encoded as 2^(N+14) for N in
+     * {0..6}:
+     * 0 = 16KB
+     * 1 = 32KB
+     * 2 = 64KB
+     * 3 = 128KB
+     * 4 = 256KB
+     * 5 = 512KB
+     * 6 = 1MB
+     * All other encodings of the XSIZE field are reserved when SMOD=1
+     */
+    uint_reg_t smod         : 1;
+    /**
+     * Total number of bytes to move for this transaction.   When SMOD=1,
+     * this field is encoded - see SMOD description.
+     */
+    uint_reg_t xsize        : 14;
+    /** Reserved. */
+    uint_reg_t __reserved_0 : 1;
+    /**
+     * Generation number.  Used to indicate a valid descriptor in ring.  When
+     * a new descriptor is written into the ring, software must toggle this
+     * bit.  The net effect is that the GEN bit being written into new
+     * descriptors toggles each time the ring tail pointer wraps.
+     */
+    uint_reg_t gen          : 1;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t gen          : 1;
+    uint_reg_t __reserved_0 : 1;
+    uint_reg_t xsize        : 14;
+    uint_reg_t smod         : 1;
+    uint_reg_t notif        : 1;
+    uint_reg_t c            : 1;
+    uint_reg_t bsz          : 3;
+    int_reg_t va           : 42;
+#endif
+
+    /* Word 1 */
+
+#ifndef __BIG_ENDIAN__
+    /** IO-side address */
+    uint_reg_t io_address : 64;
+#else   /* __BIG_ENDIAN__ */
+    uint_reg_t io_address : 64;
+#endif
+
+  };
+
+  /** Word access */
+  uint_reg_t words[2];
+} TRIO_DMA_DESC_t;
+#endif /* !defined(__ASSEMBLER__) */
+
+#endif /* !defined(__ARCH_TRIO_SHM_H__) */

arch/tile/include/arch/trio_shm_def.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_TRIO_SHM_DEF_H__
+#define __ARCH_TRIO_SHM_DEF_H__
+#endif /* !defined(__ARCH_TRIO_SHM_DEF_H__) */

arch/tile/include/arch/usb_host.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_USB_HOST_H__
+#define __ARCH_USB_HOST_H__
+
+#include <arch/abi.h>
+#include <arch/usb_host_def.h>
+
+#ifndef __ASSEMBLER__
+#endif /* !defined(__ASSEMBLER__) */
+
+#endif /* !defined(__ARCH_USB_HOST_H__) */

arch/tile/include/arch/usb_host_def.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* Machine-generated file; do not edit. */
+
+#ifndef __ARCH_USB_HOST_DEF_H__
+#define __ARCH_USB_HOST_DEF_H__
+#endif /* !defined(__ARCH_USB_HOST_DEF_H__) */

arch/tile/include/asm/Kbuild

···
 generic-y += bug.h
 generic-y += bugs.h
 generic-y += cputime.h
-generic-y += device.h
 generic-y += div64.h
 generic-y += emergency-restart.h
 generic-y += errno.h

arch/tile/include/asm/cache.h

···
 #define L2_CACHE_ALIGN(x)	(((x)+(L2_CACHE_BYTES-1)) & -L2_CACHE_BYTES)
 
 /*
- * TILE-Gx is fully coherent so we don't need to define ARCH_DMA_MINALIGN.
+ * TILEPro I/O is not always coherent (networking typically uses coherent
+ * I/O, but PCI traffic does not) and setting ARCH_DMA_MINALIGN to the
+ * L2 cacheline size helps ensure that kernel heap allocations are aligned.
+ * TILE-Gx I/O is always coherent when used on hash-for-home pages.
+ *
+ * However, it's possible at runtime to request not to use hash-for-home
+ * for the kernel heap, in which case the kernel will use flush-and-inval
+ * to manage coherence.  As a result, we use L2_CACHE_BYTES for the
+ * DMA minimum alignment to avoid false sharing in the kernel heap.
  */
-#ifndef __tilegx__
 #define ARCH_DMA_MINALIGN	L2_CACHE_BYTES
-#endif
 
 /* use the cache line size for the L2, which is where it counts */
 #define SMP_CACHE_BYTES_SHIFT	L2_CACHE_SHIFT

arch/tile/include/asm/checksum.h

···
 __wsum do_csum(const unsigned char *buff, int len);
 #define do_csum do_csum
 
+/*
+ * Return the sum of all the 16-bit subwords in a long.
+ * This sums two subwords on a 32-bit machine, and four on 64 bits.
+ * The implementation does two vector adds to capture any overflow.
+ */
+static inline unsigned int csum_long(unsigned long x)
+{
+	unsigned long ret;
+#ifdef __tilegx__
+	ret = __insn_v2sadu(x, 0);
+	ret = __insn_v2sadu(ret, 0);
+#else
+	ret = __insn_sadh_u(x, 0);
+	ret = __insn_sadh_u(ret, 0);
+#endif
+	return ret;
+}
+
 #endif /* _ASM_TILE_CHECKSUM_H */

arch/tile/include/asm/device.h

···
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ * Arch specific extensions to struct device
+ */
+
+#ifndef _ASM_TILE_DEVICE_H
+#define _ASM_TILE_DEVICE_H
+
+struct dev_archdata {
+	/* DMA operations on that device */
+        struct dma_map_ops	*dma_ops;
+
+	/* Offset of the DMA address from the PA. */
+	dma_addr_t		dma_offset;
+
+	/* Highest DMA address that can be generated by this device. */
+	dma_addr_t		max_direct_dma_addr;
+};
+
+struct pdev_archdata {
+};
+
+#endif /* _ASM_TILE_DEVICE_H */

arch/tile/include/asm/dma-mapping.h

···
 #include <linux/cache.h>
 #include <linux/io.h>
 
-/*
- * Note that on x86 and powerpc, there is a "struct dma_mapping_ops"
- * that is used for all the DMA operations.  For now, we don't have an
- * equivalent on tile, because we only have a single way of doing DMA.
- * (Tilera bug 7994 to use dma_mapping_ops.)
- */
+extern struct dma_map_ops *tile_dma_map_ops;
+extern struct dma_map_ops *gx_pci_dma_map_ops;
+extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
 
-#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
-#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+{
+	if (dev && dev->archdata.dma_ops)
+		return dev->archdata.dma_ops;
+	else
+		return tile_dma_map_ops;
+}
 
-extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
-			  enum dma_data_direction);
-extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
-			     size_t size, enum dma_data_direction);
-extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-	       enum dma_data_direction);
-extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
-			 int nhwentries, enum dma_data_direction);
-extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
-			       unsigned long offset, size_t size,
-			       enum dma_data_direction);
-extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
-			   size_t size, enum dma_data_direction);
-extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
-				int nelems, enum dma_data_direction);
-extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
-				   int nelems, enum dma_data_direction);
+static inline dma_addr_t get_dma_offset(struct device *dev)
+{
+	return dev->archdata.dma_offset;
+}
 
+static inline void set_dma_offset(struct device *dev, dma_addr_t off)
+{
+	dev->archdata.dma_offset = off;
+}
 
-void *dma_alloc_coherent(struct device *dev, size_t size,
-			   dma_addr_t *dma_handle, gfp_t flag);
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	return paddr + get_dma_offset(dev);
+}
 
-void dma_free_coherent(struct device *dev, size_t size,
-			 void *vaddr, dma_addr_t dma_handle);
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+	return daddr - get_dma_offset(dev);
+}
 
-extern void dma_sync_single_for_cpu(struct device *, dma_addr_t, size_t,
-				    enum dma_data_direction);
-extern void dma_sync_single_for_device(struct device *, dma_addr_t,
-				       size_t, enum dma_data_direction);
-extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t,
-					  unsigned long offset, size_t,
-					  enum dma_data_direction);
-extern void dma_sync_single_range_for_device(struct device *, dma_addr_t,
-					     unsigned long offset, size_t,
-					     enum dma_data_direction);
-extern void dma_cache_sync(struct device *dev, void *vaddr, size_t,
-			   enum dma_data_direction);
+static inline void dma_mark_clean(void *addr, size_t size) {}
+
+#include <asm-generic/dma-mapping-common.h>
+
+static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
+{
+	dev->archdata.dma_ops = ops;
+}
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+	if (!dev->dma_mask)
+		return 0;
+
+	return addr + size - 1 <= *dev->dma_mask;
+}
 
 static inline int
 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
-	return 0;
+	return get_dma_ops(dev)->mapping_error(dev, dma_addr);
 }
 
 static inline int
 dma_supported(struct device *dev, u64 mask)
 {
-	return 1;
+	return get_dma_ops(dev)->dma_supported(dev, mask);
 }
 
 static inline int
 dma_set_mask(struct device *dev, u64 mask)
 {
+	struct dma_map_ops *dma_ops = get_dma_ops(dev);
+
+	/* Handle legacy PCI devices with limited memory addressability. */
+	if ((dma_ops == gx_pci_dma_map_ops) && (mask <= DMA_BIT_MASK(32))) {
+		set_dma_ops(dev, gx_legacy_pci_dma_map_ops);
+		set_dma_offset(dev, 0);
+		if (mask > dev->archdata.max_direct_dma_addr)
+			mask = dev->archdata.max_direct_dma_addr;
+	}
+
 	if (!dev->dma_mask || !dma_supported(dev, mask))
 		return -EIO;
 
 	*dev->dma_mask = mask;
 
 	return 0;
+}
+
+static inline void *dma_alloc_attrs(struct device *dev, size_t size,
+				    dma_addr_t *dma_handle, gfp_t flag,
+				    struct dma_attrs *attrs)
+{
+	struct dma_map_ops *dma_ops = get_dma_ops(dev);
+	void *cpu_addr;
+
+	cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs);
+
+	debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
+
+	return cpu_addr;
+}
+
+static inline void dma_free_attrs(struct device *dev, size_t size,
+				  void *cpu_addr, dma_addr_t dma_handle,
+				  struct dma_attrs *attrs)
+{
+	struct dma_map_ops *dma_ops = get_dma_ops(dev);
+
+	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
+
+	dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
+}
+
+#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
+#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
+#define dma_free_coherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
+#define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
+
+/*
+ * dma_alloc_noncoherent() is #defined to return coherent memory,
+ * so there's no need to do any flushing here.
+ */
+static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+				  enum dma_data_direction direction)
+{
 }
 
 #endif /* _ASM_TILE_DMA_MAPPING_H */

arch/tile/include/asm/fixmap.h

···
  *
  * TLB entries of such buffers will not be flushed across
  * task switches.
- *
- * We don't bother with a FIX_HOLE since above the fixmaps
- * is unmapped memory in any case.
  */
 enum fixed_addresses {
+#ifdef __tilegx__
+	/*
+	 * TILEPro has unmapped memory above so the hole isn't needed,
+	 * and in any case the hole pushes us over a single 16MB pmd.
+	 */
+	FIX_HOLE,
+#endif
 #ifdef CONFIG_HIGHMEM
 	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
 	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
+#endif
+#ifdef __tilegx__  /* see homecache.c */
+	FIX_HOMECACHE_BEGIN,
+	FIX_HOMECACHE_END = FIX_HOMECACHE_BEGIN+(NR_CPUS)-1,
 #endif
 	__end_of_permanent_fixed_addresses,
 

arch/tile/include/asm/homecache.h

···
 /*
  * Flush a page out of whatever cache(s) it is in.
  * This is more than just finv, since it properly handles waiting
- * for the data to reach memory on tilepro, but it can be quite
- * heavyweight, particularly on hash-for-home memory.
+ * for the data to reach memory, but it can be quite
+ * heavyweight, particularly on incoherent or immutable memory.
  */
-extern void homecache_flush_cache(struct page *, int order);
+extern void homecache_finv_page(struct page *);
+
+/*
+ * Flush a page out of the specified home cache.
+ * Note that the specified home need not be the actual home of the page,
+ * as for example might be the case when coordinating with I/O devices.
+ */
+extern void homecache_finv_map_page(struct page *, int home);
 
 /*
  * Allocate a page with the given GFP flags, home, and optionally
···
  * routines use homecache_change_page_home() to reset the home
  * back to the default before returning the page to the allocator.
  */
+void __homecache_free_pages(struct page *, unsigned int order);
 void homecache_free_pages(unsigned long addr, unsigned int order);
-#define homecache_free_page(page) \
-  homecache_free_pages((page), 0)
-
+#define __homecache_free_page(page) __homecache_free_pages((page), 0)
+#define homecache_free_page(page) homecache_free_pages((page), 0)
 
 
 /*

arch/tile/include/asm/io.h

···
 #define mm_ptov(addr)		((void *)phys_to_virt(addr))
 #define mm_vtop(addr)		((unsigned long)virt_to_phys(addr))
 
+#if CHIP_HAS_MMIO()
+
+/*
+ * We use inline assembly to guarantee that the compiler does not
+ * split an access into multiple byte-sized accesses as it might
+ * sometimes do if a register data structure is marked "packed".
+ * Obviously on tile we can't tolerate such an access being
+ * actually unaligned, but we want to avoid the case where the
+ * compiler conservatively would generate multiple accesses even
+ * for an aligned read or write.
+ */
+
+static inline u8 __raw_readb(const volatile void __iomem *addr)
+{
+	return *(const volatile u8 __force *)addr;
+}
+
+static inline u16 __raw_readw(const volatile void __iomem *addr)
+{
+	u16 ret;
+	asm volatile("ld2u %0, %1" : "=r" (ret) : "r" (addr));
+	barrier();
+	return le16_to_cpu(ret);
+}
+
+static inline u32 __raw_readl(const volatile void __iomem *addr)
+{
+	u32 ret;
+	/* Sign-extend to conform to u32 ABI sign-extension convention. */
+	asm volatile("ld4s %0, %1" : "=r" (ret) : "r" (addr));
+	barrier();
+	return le32_to_cpu(ret);
+}
+
+static inline u64 __raw_readq(const volatile void __iomem *addr)
+{
+	u64 ret;
+	asm volatile("ld %0, %1" : "=r" (ret) : "r" (addr));
+	barrier();
+	return le64_to_cpu(ret);
+}
+
+static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
+{
+	*(volatile u8 __force *)addr = val;
+}
+
+static inline void __raw_writew(u16 val, volatile void __iomem *addr)
+{
+	asm volatile("st2 %0, %1" :: "r" (addr), "r" (cpu_to_le16(val)));
+}
+
+static inline void __raw_writel(u32 val, volatile void __iomem *addr)
+{
+	asm volatile("st4 %0, %1" :: "r" (addr), "r" (cpu_to_le32(val)));
+}
+
+static inline void __raw_writeq(u64 val, volatile void __iomem *addr)
+{
+	asm volatile("st %0, %1" :: "r" (addr), "r" (cpu_to_le64(val)));
+}
+
+/*
+ * The on-chip I/O hardware on tilegx is configured with VA=PA for the
+ * kernel's PA range.  The low-level APIs and field names use "va" and
+ * "void *" nomenclature, to be consistent with the general notion
+ * that the addresses in question are virtualizable, but in the kernel
+ * context we are actually manipulating PA values.  (In other contexts,
+ * e.g. access from user space, we do in fact use real virtual addresses
+ * in the va fields.)  To allow readers of the code to understand what's
+ * happening, we direct their attention to this comment by using the
+ * following two functions that just duplicate __va() and __pa().
+ */
+typedef unsigned long tile_io_addr_t;
+static inline tile_io_addr_t va_to_tile_io_addr(void *va)
+{
+	BUILD_BUG_ON(sizeof(phys_addr_t) != sizeof(tile_io_addr_t));
+	return __pa(va);
+}
+static inline void *tile_io_addr_to_va(tile_io_addr_t tile_io_addr)
+{
+	return __va(tile_io_addr);
+}
+
+#else /* CHIP_HAS_MMIO() */
+
 #ifdef CONFIG_PCI
 
 extern u8 _tile_readb(unsigned long addr);
···
 extern void _tile_writel(u32 val, unsigned long addr);
 extern void _tile_writeq(u64 val, unsigned long addr);
 
-#else
+#define __raw_readb(addr) _tile_readb((unsigned long)addr)
+#define __raw_readw(addr) _tile_readw((unsigned long)addr)
+#define __raw_readl(addr) _tile_readl((unsigned long)addr)
+#define __raw_readq(addr) _tile_readq((unsigned long)addr)
+#define __raw_writeb(val, addr) _tile_writeb(val, (unsigned long)addr)
+#define __raw_writew(val, addr) _tile_writew(val, (unsigned long)addr)
+#define __raw_writel(val, addr) _tile_writel(val, (unsigned long)addr)
+#define __raw_writeq(val, addr) _tile_writeq(val, (unsigned long)addr)
+
+#else /* CONFIG_PCI */
 
 /*
- * The Tile architecture does not support IOMEM unless PCI is enabled.
+ * The tilepro architecture does not support IOMEM unless PCI is enabled.
  * Unfortunately we can't yet simply not declare these methods,
  * since some generic code that compiles into the kernel, but
  * we never run, uses them unconditionally.
···
 	return 0;
 }
 
-static inline u8 _tile_readb(unsigned long addr)
+static inline u8 readb(unsigned long addr)
 {
 	return iomem_panic();
 }
 
-static inline u16 _tile_readw(unsigned long addr)
+static inline u16 _readw(unsigned long addr)
 {
 	return iomem_panic();
 }
 
-static inline u32 _tile_readl(unsigned long addr)
+static inline u32 readl(unsigned long addr)
 {
 	return iomem_panic();
 }
 
-static inline u64 _tile_readq(unsigned long addr)
+static inline u64 readq(unsigned long addr)
 {
 	return iomem_panic();
 }
 
-static inline void _tile_writeb(u8  val, unsigned long addr)
+static inline void writeb(u8  val, unsigned long addr)
 {
 	iomem_panic();
 }
 
-static inline void _tile_writew(u16 val, unsigned long addr)
+static inline void writew(u16 val, unsigned long addr)
 {
 	iomem_panic();
 }
 
-static inline void _tile_writel(u32 val, unsigned long addr)
+static inline void writel(u32 val, unsigned long addr)
 {
 	iomem_panic();
 }
 
-static inline void _tile_writeq(u64 val, unsigned long addr)
+static inline void writeq(u64 val, unsigned long addr)
 {
 	iomem_panic();
 }
 
-#endif
+#endif /* CONFIG_PCI */
 
-#define readb(addr) _tile_readb((unsigned long)addr)
-#define readw(addr) _tile_readw((unsigned long)addr)
-#define readl(addr) _tile_readl((unsigned long)addr)
-#define readq(addr) _tile_readq((unsigned long)addr)
-#define writeb(val, addr) _tile_writeb(val, (unsigned long)addr)
-#define writew(val, addr) _tile_writew(val, (unsigned long)addr)
-#define writel(val, addr) _tile_writel(val, (unsigned long)addr)
-#define writeq(val, addr) _tile_writeq(val, (unsigned long)addr)
+#endif /* CHIP_HAS_MMIO() */
 
-#define __raw_readb readb
-#define __raw_readw readw
-#define __raw_readl readl
-#define __raw_readq readq
-#define __raw_writeb writeb
-#define __raw_writew writew
-#define __raw_writel writel
-#define __raw_writeq writeq
+#define readb __raw_readb
+#define readw __raw_readw
+#define readl __raw_readl
+#define readq __raw_readq
+#define writeb __raw_writeb
+#define writew __raw_writew
+#define writel __raw_writel
+#define writeq __raw_writeq
 
 #define readb_relaxed readb
 #define readw_relaxed readw

arch/tile/include/asm/memprof.h

···
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- *
- * The hypervisor's memory controller profiling infrastructure allows
- * the programmer to find out what fraction of the available memory
- * bandwidth is being consumed at each memory controller.  The
- * profiler provides start, stop, and clear operations to allows
- * profiling over a specific time window, as well as an interface for
- * reading the most recent profile values.
- *
- * This header declares IOCTL codes necessary to control memprof.
- */
-#ifndef _ASM_TILE_MEMPROF_H
-#define _ASM_TILE_MEMPROF_H
-
-#include <linux/ioctl.h>
-
-#define MEMPROF_IOCTL_TYPE 0xB4
-#define MEMPROF_IOCTL_START _IO(MEMPROF_IOCTL_TYPE, 0)
-#define MEMPROF_IOCTL_STOP _IO(MEMPROF_IOCTL_TYPE, 1)
-#define MEMPROF_IOCTL_CLEAR _IO(MEMPROF_IOCTL_TYPE, 2)
-
-#endif /* _ASM_TILE_MEMPROF_H */

arch/tile/include/asm/page.h

···
 #define MEM_LOW_END		(HALF_VA_SPACE - 1)         /* low half */
 #define MEM_HIGH_START		(-HALF_VA_SPACE)            /* high half */
 #define PAGE_OFFSET		MEM_HIGH_START
-#define _VMALLOC_START		_AC(0xfffffff500000000, UL) /* 4 GB */
+#define FIXADDR_BASE		_AC(0xfffffff400000000, UL) /* 4 GB */
+#define FIXADDR_TOP		_AC(0xfffffff500000000, UL) /* 4 GB */
+#define _VMALLOC_START		FIXADDR_TOP
 #define HUGE_VMAP_BASE		_AC(0xfffffff600000000, UL) /* 4 GB */
 #define MEM_SV_START		_AC(0xfffffff700000000, UL) /* 256 MB */
 #define MEM_SV_INTRPT		MEM_SV_START
···
 
 /* Highest DTLB address we will use */
 #define KERNEL_HIGH_VADDR	MEM_SV_START
-
-/* Since we don't currently provide any fixmaps, we use an impossible VA. */
-#define FIXADDR_TOP             MEM_HV_START
 
 #else /* !__tilegx__ */
 

arch/tile/include/asm/pci.h

···
 #ifndef _ASM_TILE_PCI_H
 #define _ASM_TILE_PCI_H
 
+#include <linux/dma-mapping.h>
 #include <linux/pci.h>
+#include <linux/numa.h>
 #include <asm-generic/pci_iomap.h>
+
+#ifndef __tilegx__
 
 /*
  * Structure of a PCI controller (host bridge)
···
 };
 
 /*
+ * This flag tells if the platform is TILEmpower that needs
+ * special configuration for the PLX switch chip.
+ */
+extern int tile_plx_gen1;
+
+static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}
+
+#define	TILE_NUM_PCIE	2
+
+/*
  * The hypervisor maps the entirety of CPA-space as bus addresses, so
  * bus addresses are physical addresses.  The networking and block
  * device layers use this boolean for bounce buffer decisions.
  */
 #define PCI_DMA_BUS_IS_PHYS     1
 
+/* generic pci stuff */
+#include <asm-generic/pci.h>
+
+#else
+
+#include <asm/page.h>
+#include <gxio/trio.h>
+
+/**
+ * We reserve the hugepage-size address range at the top of the 64-bit address
+ * space to serve as the PCI window, emulating the BAR0 space of an endpoint
+ * device. This window is used by the chip-to-chip applications running on
+ * the RC node. The reason for carving out this window is that Mem-Maps that
+ * back up this window will not overlap with those that map the real physical
+ * memory.
+ */
+#define PCIE_HOST_BAR0_SIZE		HPAGE_SIZE
+#define PCIE_HOST_BAR0_START		HPAGE_MASK
+
+/**
+ * The first PAGE_SIZE of the above "BAR" window is mapped to the
+ * gxpci_host_regs structure.
+ */
+#define PCIE_HOST_REGS_SIZE		PAGE_SIZE
+
+/*
+ * This is the PCI address where the Mem-Map interrupt regions start.
+ * We use the 2nd to the last huge page of the 64-bit address space.
+ * The last huge page is used for the rootcomplex "bar", for C2C purpose.
+ */
+#define	MEM_MAP_INTR_REGIONS_BASE	(HPAGE_MASK - HPAGE_SIZE)
+
+/*
+ * Each Mem-Map interrupt region occupies 4KB.
+ */
+#define	MEM_MAP_INTR_REGION_SIZE	(1 << TRIO_MAP_MEM_LIM__ADDR_SHIFT)
+
+/*
+ * Allocate the PCI BAR window right below 4GB.
+ */
+#define	TILE_PCI_BAR_WINDOW_TOP		(1ULL << 32)
+
+/*
+ * Allocate 1GB for the PCI BAR window.
+ */
+#define	TILE_PCI_BAR_WINDOW_SIZE	(1 << 30)
+
+/*
+ * This is the highest bus address targeting the host memory that
+ * can be generated by legacy PCI devices with 32-bit or less
+ * DMA capability, dictated by the BAR window size and location.
+ */
+#define	TILE_PCI_MAX_DIRECT_DMA_ADDRESS \
+	(TILE_PCI_BAR_WINDOW_TOP - TILE_PCI_BAR_WINDOW_SIZE - 1)
+
+/*
+ * We shift the PCI bus range for all the physical memory up by the whole PA
+ * range. The corresponding CPA of an incoming PCI request will be the PCI
+ * address minus TILE_PCI_MEM_MAP_BASE_OFFSET. This also implies
+ * that the 64-bit capable devices will be given DMA addresses as
+ * the CPA plus TILE_PCI_MEM_MAP_BASE_OFFSET. To support 32-bit
+ * devices, we create a separate map region that handles the low
+ * 4GB.
+ */
+#define	TILE_PCI_MEM_MAP_BASE_OFFSET	(1ULL << CHIP_PA_WIDTH())
+
+/*
+ * Start of the PCI memory resource, which starts at the end of the
+ * maximum system physical RAM address.
+ */
+#define	TILE_PCI_MEM_START	(1ULL << CHIP_PA_WIDTH())
+
+/*
+ * Structure of a PCI controller (host bridge) on Gx.
+ */
+struct pci_controller {
+
+	/* Pointer back to the TRIO that this PCIe port is connected to. */
+	gxio_trio_context_t *trio;
+	int mac;		/* PCIe mac index on the TRIO shim */
+	int trio_index;		/* Index of TRIO shim that contains the MAC. */
+
+	int pio_mem_index;	/* PIO region index for memory access */
+
+	/*
+	 * Mem-Map regions for all the memory controllers so that Linux can
+	 * map all of its physical memory space to the PCI bus.
+	 */
+	int mem_maps[MAX_NUMNODES];
+
+	int index;		/* PCI domain number */
+	struct pci_bus *root_bus;
+
+	/* PCI memory space resource for this controller. */
+	struct resource mem_space;
+	char mem_space_name[32];
+
+	uint64_t mem_offset;	/* cpu->bus memory mapping offset. */
+
+	int first_busno;
+
+	struct pci_ops *ops;
+
+	/* Table that maps the INTx numbers to Linux irq numbers. */
+	int irq_intx_table[4];
+
+	/* Address ranges that are routed to this controller/bridge. */
+	struct resource mem_resources[3];
+};
+
+extern struct pci_controller pci_controllers[TILEGX_NUM_TRIO * TILEGX_TRIO_PCIES];
+extern gxio_trio_context_t trio_contexts[TILEGX_NUM_TRIO];
+
+extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
+
+/*
+ * The PCI address space does not equal the physical memory address
+ * space (we have an IOMMU). The IDE and SCSI device layers use this
+ * boolean for bounce buffer decisions.
+ */
+#define PCI_DMA_BUS_IS_PHYS     0
+
+#endif /* __tilegx__ */
+
 int __init tile_pci_init(void);
 int __init pcibios_init(void);
 
-static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}
-
 void __devinit pcibios_fixup_bus(struct pci_bus *bus);
-
-#define	TILE_NUM_PCIE	2
 
 #define pci_domain_nr(bus) (((struct pci_controller *)(bus)->sysdata)->index)
 
···
 #define PCIBIOS_MIN_MEM		0
 #define PCIBIOS_MIN_IO		0
 
-/*
- * This flag tells if the platform is TILEmpower that needs
- * special configuration for the PLX switch chip.
- */
-extern int tile_plx_gen1;
-
 /* Use any cpu for PCI. */
 #define cpumask_of_pcibus(bus) cpu_online_mask
 
 /* implement the pci_ DMA API in terms of the generic device dma_ one */
 #include <asm-generic/pci-dma-compat.h>
-
-/* generic pci stuff */
-#include <asm-generic/pci.h>
 
 #endif /* _ASM_TILE_PCI_H */

arch/tile/include/gxio/common.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#ifndef _GXIO_COMMON_H_
+#define _GXIO_COMMON_H_
+
+/*
+ * Routines shared between the various GXIO device components.
+ */
+
+#include <hv/iorpc.h>
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <linux/io.h>
+
+/* Define the standard gxio MMIO functions using kernel functions. */
+#define __gxio_mmio_read8(addr)		readb(addr)
+#define __gxio_mmio_read16(addr)	readw(addr)
+#define __gxio_mmio_read32(addr)	readl(addr)
+#define __gxio_mmio_read64(addr)	readq(addr)
+#define __gxio_mmio_write8(addr, val)	writeb((val), (addr))
+#define __gxio_mmio_write16(addr, val)	writew((val), (addr))
+#define __gxio_mmio_write32(addr, val)	writel((val), (addr))
+#define __gxio_mmio_write64(addr, val)	writeq((val), (addr))
+#define __gxio_mmio_read(addr)		__gxio_mmio_read64(addr)
+#define __gxio_mmio_write(addr, val)	__gxio_mmio_write64((addr), (val))
+
+#endif /* !_GXIO_COMMON_H_ */

arch/tile/include/gxio/dma_queue.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#ifndef _GXIO_DMA_QUEUE_H_
+#define _GXIO_DMA_QUEUE_H_
+
+/*
+ * DMA queue management APIs shared between TRIO and mPIPE.
+ */
+
+#include "common.h"
+
+/* The credit counter lives in the high 32 bits. */
+#define DMA_QUEUE_CREDIT_SHIFT 32
+
+/*
+ * State object that tracks a DMA queue's head and tail indices, as
+ * well as the number of commands posted and completed.  The
+ * structure is accessed via a thread-safe, lock-free algorithm.
+ */
+typedef struct {
+	/*
+	 * Address of a MPIPE_EDMA_POST_REGION_VAL_t,
+	 * TRIO_PUSH_DMA_REGION_VAL_t, or TRIO_PULL_DMA_REGION_VAL_t
+	 * register.  These register have identical encodings and provide
+	 * information about how many commands have been processed.
+	 */
+	void *post_region_addr;
+
+	/*
+	 * A lazily-updated count of how many edescs the hardware has
+	 * completed.
+	 */
+	uint64_t hw_complete_count __attribute__ ((aligned(64)));
+
+	/*
+	 * High 32 bits are a count of available egress command credits,
+	 * low 24 bits are the next egress "slot".
+	 */
+	int64_t credits_and_next_index;
+
+} __gxio_dma_queue_t;
+
+/* Initialize a dma queue. */
+extern void __gxio_dma_queue_init(__gxio_dma_queue_t *dma_queue,
+				  void *post_region_addr,
+				  unsigned int num_entries);
+
+/*
+ * Update the "credits_and_next_index" and "hw_complete_count" fields
+ * based on pending hardware completions.  Note that some other thread
+ * may have already done this and, importantly, may still be in the
+ * process of updating "credits_and_next_index".
+ */
+extern void __gxio_dma_queue_update_credits(__gxio_dma_queue_t *dma_queue);
+
+/* Wait for credits to become available. */
+extern int64_t __gxio_dma_queue_wait_for_credits(__gxio_dma_queue_t *dma_queue,
+						 int64_t modifier);
+
+/* Reserve slots in the queue, optionally waiting for slots to become
+ * available, and optionally returning a "completion_slot" suitable for
+ * direct comparison to "hw_complete_count".
+ */
+static inline int64_t __gxio_dma_queue_reserve(__gxio_dma_queue_t *dma_queue,
+					       unsigned int num, bool wait,
+					       bool completion)
+{
+	uint64_t slot;
+
+	/*
+	 * Try to reserve 'num' egress command slots.  We do this by
+	 * constructing a constant that subtracts N credits and adds N to
+	 * the index, and using fetchaddgez to only apply it if the credits
+	 * count doesn't go negative.
+	 */
+	int64_t modifier = (((int64_t)(-num)) << DMA_QUEUE_CREDIT_SHIFT) | num;
+	int64_t old =
+		__insn_fetchaddgez(&dma_queue->credits_and_next_index,
+				   modifier);
+
+	if (unlikely(old + modifier < 0)) {
+		/*
+		 * We're out of credits.  Try once to get more by checking for
+		 * completed egress commands.  If that fails, wait or fail.
+		 */
+		__gxio_dma_queue_update_credits(dma_queue);
+		old = __insn_fetchaddgez(&dma_queue->credits_and_next_index,
+					 modifier);
+		if (old + modifier < 0) {
+			if (wait)
+				old = __gxio_dma_queue_wait_for_credits
+					(dma_queue, modifier);
+			else
+				return GXIO_ERR_DMA_CREDITS;
+		}
+	}
+
+	/* The bottom 24 bits of old encode the "slot". */
+	slot = (old & 0xffffff);
+
+	if (completion) {
+		/*
+		 * A "completion_slot" is a "slot" which can be compared to
+		 * "hw_complete_count" at any time in the future.  To convert
+		 * "slot" into a "completion_slot", we access "hw_complete_count"
+		 * once (knowing that we have reserved a slot, and thus, it will
+		 * be "basically" accurate), and combine its high 40 bits with
+		 * the 24 bit "slot", and handle "wrapping" by adding "1 << 24"
+		 * if the result is LESS than "hw_complete_count".
+		 */
+		uint64_t complete;
+		complete = ACCESS_ONCE(dma_queue->hw_complete_count);
+		slot |= (complete & 0xffffffffff000000);
+		if (slot < complete)
+			slot += 0x1000000;
+	}
+
+	/*
+	 * If any of our slots mod 256 were equivalent to 0, go ahead and
+	 * collect some egress credits, and update "hw_complete_count", and
+	 * make sure the index doesn't overflow into the credits.
+	 */
+	if (unlikely(((old + num) & 0xff) < num)) {
+		__gxio_dma_queue_update_credits(dma_queue);
+
+		/* Make sure the index doesn't overflow into the credits. */
+#ifdef __BIG_ENDIAN__
+		*(((uint8_t *)&dma_queue->credits_and_next_index) + 4) = 0;
+#else
+		*(((uint8_t *)&dma_queue->credits_and_next_index) + 3) = 0;
+#endif
+	}
+
+	return slot;
+}
+
+/* Non-inlinable "__gxio_dma_queue_reserve(..., true)". */
+extern int64_t __gxio_dma_queue_reserve_aux(__gxio_dma_queue_t *dma_queue,
+					    unsigned int num, int wait);
+
+/* Check whether a particular "completion slot" has completed.
+ *
+ * Note that this function requires a "completion slot", and thus
+ * cannot be used with the result of any "reserve_fast" function.
+ */
+extern int __gxio_dma_queue_is_complete(__gxio_dma_queue_t *dma_queue,
+					int64_t completion_slot, int update);
+
+#endif /* !_GXIO_DMA_QUEUE_H_ */

arch/tile/include/gxio/iorpc_globals.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#ifndef __IORPC_LINUX_RPC_H__
+#define __IORPC_LINUX_RPC_H__
+
+#include <hv/iorpc.h>
+
+#include <linux/string.h>
+#include <linux/module.h>
+#include <asm/pgtable.h>
+
+#define IORPC_OP_ARM_POLLFD            IORPC_OPCODE(IORPC_FORMAT_KERNEL_POLLFD, 0x9000)
+#define IORPC_OP_CLOSE_POLLFD          IORPC_OPCODE(IORPC_FORMAT_KERNEL_POLLFD, 0x9001)
+#define IORPC_OP_GET_MMIO_BASE         IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8000)
+#define IORPC_OP_CHECK_MMIO_OFFSET     IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8001)
+
+int __iorpc_arm_pollfd(int fd, int pollfd_cookie);
+
+int __iorpc_close_pollfd(int fd, int pollfd_cookie);
+
+int __iorpc_get_mmio_base(int fd, HV_PTE *base);
+
+int __iorpc_check_mmio_offset(int fd, unsigned long offset, unsigned long size);
+
+#endif /* !__IORPC_LINUX_RPC_H__ */

arch/tile/include/gxio/iorpc_mpipe.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#ifndef __GXIO_MPIPE_LINUX_RPC_H__
+#define __GXIO_MPIPE_LINUX_RPC_H__
+
+#include <hv/iorpc.h>
+
+#include <hv/drv_mpipe_intf.h>
+#include <asm/page.h>
+#include <gxio/kiorpc.h>
+#include <gxio/mpipe.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <asm/pgtable.h>
+
+#define GXIO_MPIPE_OP_ALLOC_BUFFER_STACKS IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1200)
+#define GXIO_MPIPE_OP_INIT_BUFFER_STACK_AUX IORPC_OPCODE(IORPC_FORMAT_KERNEL_MEM, 0x1201)
+
+#define GXIO_MPIPE_OP_ALLOC_NOTIF_RINGS IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1203)
+#define GXIO_MPIPE_OP_INIT_NOTIF_RING_AUX IORPC_OPCODE(IORPC_FORMAT_KERNEL_MEM, 0x1204)
+#define GXIO_MPIPE_OP_REQUEST_NOTIF_RING_INTERRUPT IORPC_OPCODE(IORPC_FORMAT_KERNEL_INTERRUPT, 0x1205)
+#define GXIO_MPIPE_OP_ENABLE_NOTIF_RING_INTERRUPT IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1206)
+#define GXIO_MPIPE_OP_ALLOC_NOTIF_GROUPS IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1207)
+#define GXIO_MPIPE_OP_INIT_NOTIF_GROUP IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1208)
+#define GXIO_MPIPE_OP_ALLOC_BUCKETS    IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1209)
+#define GXIO_MPIPE_OP_INIT_BUCKET      IORPC_OPCODE(IORPC_FORMAT_NONE, 0x120a)
+#define GXIO_MPIPE_OP_ALLOC_EDMA_RINGS IORPC_OPCODE(IORPC_FORMAT_NONE, 0x120b)
+#define GXIO_MPIPE_OP_INIT_EDMA_RING_AUX IORPC_OPCODE(IORPC_FORMAT_KERNEL_MEM, 0x120c)
+
+#define GXIO_MPIPE_OP_COMMIT_RULES     IORPC_OPCODE(IORPC_FORMAT_NONE, 0x120f)
+#define GXIO_MPIPE_OP_REGISTER_CLIENT_MEMORY IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x1210)
+#define GXIO_MPIPE_OP_LINK_OPEN_AUX    IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1211)
+#define GXIO_MPIPE_OP_LINK_CLOSE_AUX   IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1212)
+
+#define GXIO_MPIPE_OP_GET_TIMESTAMP_AUX IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x121e)
+#define GXIO_MPIPE_OP_SET_TIMESTAMP_AUX IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x121f)
+#define GXIO_MPIPE_OP_ADJUST_TIMESTAMP_AUX IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x1220)
+#define GXIO_MPIPE_OP_ARM_POLLFD       IORPC_OPCODE(IORPC_FORMAT_KERNEL_POLLFD, 0x9000)
+#define GXIO_MPIPE_OP_CLOSE_POLLFD     IORPC_OPCODE(IORPC_FORMAT_KERNEL_POLLFD, 0x9001)
+#define GXIO_MPIPE_OP_GET_MMIO_BASE    IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8000)
+#define GXIO_MPIPE_OP_CHECK_MMIO_OFFSET IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8001)
+
+int gxio_mpipe_alloc_buffer_stacks(gxio_mpipe_context_t * context,
+				   unsigned int count, unsigned int first,
+				   unsigned int flags);
+
+int gxio_mpipe_init_buffer_stack_aux(gxio_mpipe_context_t * context,
+				     void *mem_va, size_t mem_size,
+				     unsigned int mem_flags, unsigned int stack,
+				     unsigned int buffer_size_enum);
+
+
+int gxio_mpipe_alloc_notif_rings(gxio_mpipe_context_t * context,
+				 unsigned int count, unsigned int first,
+				 unsigned int flags);
+
+int gxio_mpipe_init_notif_ring_aux(gxio_mpipe_context_t * context, void *mem_va,
+				   size_t mem_size, unsigned int mem_flags,
+				   unsigned int ring);
+
+int gxio_mpipe_request_notif_ring_interrupt(gxio_mpipe_context_t * context,
+					    int inter_x, int inter_y,
+					    int inter_ipi, int inter_event,
+					    unsigned int ring);
+
+int gxio_mpipe_enable_notif_ring_interrupt(gxio_mpipe_context_t * context,
+					   unsigned int ring);
+
+int gxio_mpipe_alloc_notif_groups(gxio_mpipe_context_t * context,
+				  unsigned int count, unsigned int first,
+				  unsigned int flags);
+
+int gxio_mpipe_init_notif_group(gxio_mpipe_context_t * context,
+				unsigned int group,
+				gxio_mpipe_notif_group_bits_t bits);
+
+int gxio_mpipe_alloc_buckets(gxio_mpipe_context_t * context, unsigned int count,
+			     unsigned int first, unsigned int flags);
+
+int gxio_mpipe_init_bucket(gxio_mpipe_context_t * context, unsigned int bucket,
+			   MPIPE_LBL_INIT_DAT_BSTS_TBL_t bucket_info);
+
+int gxio_mpipe_alloc_edma_rings(gxio_mpipe_context_t * context,
+				unsigned int count, unsigned int first,
+				unsigned int flags);
+
+int gxio_mpipe_init_edma_ring_aux(gxio_mpipe_context_t * context, void *mem_va,
+				  size_t mem_size, unsigned int mem_flags,
+				  unsigned int ring, unsigned int channel);
+
+
+int gxio_mpipe_commit_rules(gxio_mpipe_context_t * context, const void *blob,
+			    size_t blob_size);
+
+int gxio_mpipe_register_client_memory(gxio_mpipe_context_t * context,
+				      unsigned int iotlb, HV_PTE pte,
+				      unsigned int flags);
+
+int gxio_mpipe_link_open_aux(gxio_mpipe_context_t * context,
+			     _gxio_mpipe_link_name_t name, unsigned int flags);
+
+int gxio_mpipe_link_close_aux(gxio_mpipe_context_t * context, int mac);
+
+
+int gxio_mpipe_get_timestamp_aux(gxio_mpipe_context_t * context, uint64_t * sec,
+				 uint64_t * nsec, uint64_t * cycles);
+
+int gxio_mpipe_set_timestamp_aux(gxio_mpipe_context_t * context, uint64_t sec,
+				 uint64_t nsec, uint64_t cycles);
+
+int gxio_mpipe_adjust_timestamp_aux(gxio_mpipe_context_t * context,
+				    int64_t nsec);
+
+int gxio_mpipe_arm_pollfd(gxio_mpipe_context_t * context, int pollfd_cookie);
+
+int gxio_mpipe_close_pollfd(gxio_mpipe_context_t * context, int pollfd_cookie);
+
+int gxio_mpipe_get_mmio_base(gxio_mpipe_context_t * context, HV_PTE *base);
+
+int gxio_mpipe_check_mmio_offset(gxio_mpipe_context_t * context,
+				 unsigned long offset, unsigned long size);
+
+#endif /* !__GXIO_MPIPE_LINUX_RPC_H__ */

arch/tile/include/gxio/iorpc_mpipe_info.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#ifndef __GXIO_MPIPE_INFO_LINUX_RPC_H__
+#define __GXIO_MPIPE_INFO_LINUX_RPC_H__
+
+#include <hv/iorpc.h>
+
+#include <hv/drv_mpipe_intf.h>
+#include <asm/page.h>
+#include <gxio/kiorpc.h>
+#include <gxio/mpipe.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <asm/pgtable.h>
+
+
+#define GXIO_MPIPE_INFO_OP_ENUMERATE_AUX IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1251)
+#define GXIO_MPIPE_INFO_OP_GET_MMIO_BASE IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8000)
+#define GXIO_MPIPE_INFO_OP_CHECK_MMIO_OFFSET IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8001)
+
+
+int gxio_mpipe_info_enumerate_aux(gxio_mpipe_info_context_t * context,
+				  unsigned int idx,
+				  _gxio_mpipe_link_name_t * name,
+				  _gxio_mpipe_link_mac_t * mac);
+
+int gxio_mpipe_info_get_mmio_base(gxio_mpipe_info_context_t * context,
+				  HV_PTE *base);
+
+int gxio_mpipe_info_check_mmio_offset(gxio_mpipe_info_context_t * context,
+				      unsigned long offset, unsigned long size);
+
+#endif /* !__GXIO_MPIPE_INFO_LINUX_RPC_H__ */

arch/tile/include/gxio/iorpc_trio.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#ifndef __GXIO_TRIO_LINUX_RPC_H__
+#define __GXIO_TRIO_LINUX_RPC_H__
+
+#include <hv/iorpc.h>
+
+#include <hv/drv_trio_intf.h>
+#include <gxio/trio.h>
+#include <gxio/kiorpc.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <asm/pgtable.h>
+
+#define GXIO_TRIO_OP_ALLOC_ASIDS       IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1400)
+
+#define GXIO_TRIO_OP_ALLOC_MEMORY_MAPS IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1402)
+
+#define GXIO_TRIO_OP_ALLOC_PIO_REGIONS IORPC_OPCODE(IORPC_FORMAT_NONE, 0x140e)
+#define GXIO_TRIO_OP_INIT_PIO_REGION_AUX IORPC_OPCODE(IORPC_FORMAT_NONE, 0x140f)
+
+#define GXIO_TRIO_OP_INIT_MEMORY_MAP_MMU_AUX IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x1417)
+#define GXIO_TRIO_OP_GET_PORT_PROPERTY IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x1418)
+#define GXIO_TRIO_OP_CONFIG_LEGACY_INTR IORPC_OPCODE(IORPC_FORMAT_KERNEL_INTERRUPT, 0x1419)
+#define GXIO_TRIO_OP_CONFIG_MSI_INTR   IORPC_OPCODE(IORPC_FORMAT_KERNEL_INTERRUPT, 0x141a)
+
+#define GXIO_TRIO_OP_SET_MPS_MRS       IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x141c)
+#define GXIO_TRIO_OP_FORCE_RC_LINK_UP  IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x141d)
+#define GXIO_TRIO_OP_FORCE_EP_LINK_UP  IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x141e)
+#define GXIO_TRIO_OP_GET_MMIO_BASE     IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8000)
+#define GXIO_TRIO_OP_CHECK_MMIO_OFFSET IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8001)
+
+int gxio_trio_alloc_asids(gxio_trio_context_t * context, unsigned int count,
+			  unsigned int first, unsigned int flags);
+
+
+int gxio_trio_alloc_memory_maps(gxio_trio_context_t * context,
+				unsigned int count, unsigned int first,
+				unsigned int flags);
+
+
+int gxio_trio_alloc_pio_regions(gxio_trio_context_t * context,
+				unsigned int count, unsigned int first,
+				unsigned int flags);
+
+int gxio_trio_init_pio_region_aux(gxio_trio_context_t * context,
+				  unsigned int pio_region, unsigned int mac,
+				  uint32_t bus_address_hi, unsigned int flags);
+
+
+int gxio_trio_init_memory_map_mmu_aux(gxio_trio_context_t * context,
+				      unsigned int map, unsigned long va,
+				      uint64_t size, unsigned int asid,
+				      unsigned int mac, uint64_t bus_address,
+				      unsigned int node,
+				      unsigned int order_mode);
+
+int gxio_trio_get_port_property(gxio_trio_context_t * context,
+				struct pcie_trio_ports_property *trio_ports);
+
+int gxio_trio_config_legacy_intr(gxio_trio_context_t * context, int inter_x,
+				 int inter_y, int inter_ipi, int inter_event,
+				 unsigned int mac, unsigned int intx);
+
+int gxio_trio_config_msi_intr(gxio_trio_context_t * context, int inter_x,
+			      int inter_y, int inter_ipi, int inter_event,
+			      unsigned int mac, unsigned int mem_map,
+			      uint64_t mem_map_base, uint64_t mem_map_limit,
+			      unsigned int asid);
+
+
+int gxio_trio_set_mps_mrs(gxio_trio_context_t * context, uint16_t mps,
+			  uint16_t mrs, unsigned int mac);
+
+int gxio_trio_force_rc_link_up(gxio_trio_context_t * context, unsigned int mac);
+
+int gxio_trio_force_ep_link_up(gxio_trio_context_t * context, unsigned int mac);
+
+int gxio_trio_get_mmio_base(gxio_trio_context_t * context, HV_PTE *base);
+
+int gxio_trio_check_mmio_offset(gxio_trio_context_t * context,
+				unsigned long offset, unsigned long size);
+
+#endif /* !__GXIO_TRIO_LINUX_RPC_H__ */

arch/tile/include/gxio/iorpc_usb_host.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/* This file is machine-generated; DO NOT EDIT! */
+#ifndef __GXIO_USB_HOST_LINUX_RPC_H__
+#define __GXIO_USB_HOST_LINUX_RPC_H__
+
+#include <hv/iorpc.h>
+
+#include <hv/drv_usb_host_intf.h>
+#include <asm/page.h>
+#include <gxio/kiorpc.h>
+#include <gxio/usb_host.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <asm/pgtable.h>
+
+#define GXIO_USB_HOST_OP_CFG_INTERRUPT IORPC_OPCODE(IORPC_FORMAT_KERNEL_INTERRUPT, 0x1800)
+#define GXIO_USB_HOST_OP_REGISTER_CLIENT_MEMORY IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x1801)
+#define GXIO_USB_HOST_OP_GET_MMIO_BASE IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8000)
+#define GXIO_USB_HOST_OP_CHECK_MMIO_OFFSET IORPC_OPCODE(IORPC_FORMAT_NONE_NOUSER, 0x8001)
+
+int gxio_usb_host_cfg_interrupt(gxio_usb_host_context_t * context, int inter_x,
+				int inter_y, int inter_ipi, int inter_event);
+
+int gxio_usb_host_register_client_memory(gxio_usb_host_context_t * context,
+					 HV_PTE pte, unsigned int flags);
+
+int gxio_usb_host_get_mmio_base(gxio_usb_host_context_t * context,
+				HV_PTE *base);
+
+int gxio_usb_host_check_mmio_offset(gxio_usb_host_context_t * context,
+				    unsigned long offset, unsigned long size);
+
+#endif /* !__GXIO_USB_HOST_LINUX_RPC_H__ */

arch/tile/include/gxio/kiorpc.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ *
+ * Support routines for kernel IORPC drivers.
+ */
+
+#ifndef _GXIO_KIORPC_H
+#define _GXIO_KIORPC_H
+
+#include <linux/types.h>
+#include <asm/page.h>
+#include <arch/chip.h>
+
+#if CHIP_HAS_MMIO()
+void __iomem *iorpc_ioremap(int hv_fd, resource_size_t offset,
+			    unsigned long size);
+#endif
+
+#endif /* _GXIO_KIORPC_H */

arch/tile/include/gxio/mpipe.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#ifndef _GXIO_MPIPE_H_
+#define _GXIO_MPIPE_H_
+
+/*
+ *
+ * An API for allocating, configuring, and manipulating mPIPE hardware
+ * resources.
+ */
+
+#include "common.h"
+#include "dma_queue.h"
+
+#include <linux/time.h>
+
+#include <arch/mpipe_def.h>
+#include <arch/mpipe_shm.h>
+
+#include <hv/drv_mpipe_intf.h>
+#include <hv/iorpc.h>
+
+/*
+ *
+ * The TILE-Gx mPIPE&tm; shim provides Ethernet connectivity, packet
+ * classification, and packet load balancing services.  The
+ * gxio_mpipe_ API, declared in <gxio/mpipe.h>, allows applications to
+ * allocate mPIPE IO channels, configure packet distribution
+ * parameters, and send and receive Ethernet packets.  The API is
+ * designed to be a minimal wrapper around the mPIPE hardware, making
+ * system calls only where necessary to preserve inter-process
+ * protection guarantees.
+ *
+ * The APIs described below allow the programmer to allocate and
+ * configure mPIPE resources.  As described below, the mPIPE is a
+ * single shared hardware device that provides partitionable resources
+ * that are shared between all applications in the system.  The
+ * gxio_mpipe_ API allows userspace code to make resource request
+ * calls to the hypervisor, which in turns keeps track of the
+ * resources in use by all applications, maintains protection
+ * guarantees, and resets resources upon application shutdown.
+ *
+ * We strongly recommend reading the mPIPE section of the IO Device
+ * Guide (UG404) before working with this API.  Most functions in the
+ * gxio_mpipe_ API are directly analogous to hardware interfaces and
+ * the documentation assumes that the reader understands those
+ * hardware interfaces.
+ *
+ * @section mpipe__ingress mPIPE Ingress Hardware Resources
+ *
+ * The mPIPE ingress hardware provides extensive hardware offload for
+ * tasks like packet header parsing, load balancing, and memory
+ * management.  This section provides a brief introduction to the
+ * hardware components and the gxio_mpipe_ calls used to manage them;
+ * see the IO Device Guide for a much more detailed description of the
+ * mPIPE's capabilities.
+ *
+ * When a packet arrives at one of the mPIPE's Ethernet MACs, it is
+ * assigned a channel number indicating which MAC received it.  It
+ * then proceeds through the following hardware pipeline:
+ *
+ * @subsection mpipe__classification Classification
+ *
+ * A set of classification processors run header parsing code on each
+ * incoming packet, extracting information including the destination
+ * MAC address, VLAN, Ethernet type, and five-tuple hash.  Some of
+ * this information is then used to choose which buffer stack will be
+ * used to hold the packet, and which bucket will be used by the load
+ * balancer to determine which application will receive the packet.
+ *
+ * The rules by which the buffer stack and bucket are chosen can be
+ * configured via the @ref gxio_mpipe_classifier API.  A given app can
+ * specify multiple rules, each one specifying a bucket range, and a
+ * set of buffer stacks, to be used for packets matching the rule.
+ * Each rule can optionally specify a restricted set of channels,
+ * VLANs, and/or dMACs, in which it is interested.  By default, a
+ * given rule starts out matching all channels associated with the
+ * mPIPE context's set of open links; all VLANs; and all dMACs.
+ * Subsequent restrictions can then be added.
+ *
+ * @subsection mpipe__load_balancing Load Balancing
+ *
+ * The mPIPE load balancer is responsible for choosing the NotifRing
+ * to which the packet will be delivered.  This decision is based on
+ * the bucket number indicated by the classification program.  In
+ * general, the bucket number is based on some number of low bits of
+ * the packet's flow hash (applications that aren't interested in flow
+ * hashing use a single bucket).  Each load balancer bucket keeps a
+ * record of the NotifRing to which packets directed to that bucket
+ * are currently being delivered.  Based on the bucket's load
+ * balancing mode (@ref gxio_mpipe_bucket_mode_t), the load balancer
+ * either forwards the packet to the previously assigned NotifRing or
+ * decides to choose a new NotifRing.  If a new NotifRing is required,
+ * the load balancer chooses the least loaded ring in the NotifGroup
+ * associated with the bucket.
+ *
+ * The load balancer is a shared resource.  Each application needs to
+ * explicitly allocate NotifRings, NotifGroups, and buckets, using
+ * gxio_mpipe_alloc_notif_rings(), gxio_mpipe_alloc_notif_groups(),
+ * and gxio_mpipe_alloc_buckets().  Then the application needs to
+ * configure them using gxio_mpipe_init_notif_ring() and
+ * gxio_mpipe_init_notif_group_and_buckets().
+ *
+ * @subsection mpipe__buffers Buffer Selection and Packet Delivery
+ *
+ * Once the load balancer has chosen the destination NotifRing, the
+ * mPIPE DMA engine pops at least one buffer off of the 'buffer stack'
+ * chosen by the classification program and DMAs the packet data into
+ * that buffer.  Each buffer stack provides a hardware-accelerated
+ * stack of data buffers with the same size.  If the packet data is
+ * larger than the buffers provided by the chosen buffer stack, the
+ * mPIPE hardware pops off multiple buffers and chains the packet data
+ * through a multi-buffer linked list.  Once the packet data is
+ * delivered to the buffer(s), the mPIPE hardware writes the
+ * ::gxio_mpipe_idesc_t metadata object (calculated by the classifier)
+ * into the NotifRing and increments the number of packets delivered
+ * to that ring.
+ *
+ * Applications can push buffers onto a buffer stack by calling
+ * gxio_mpipe_push_buffer() or by egressing a packet with the
+ * ::gxio_mpipe_edesc_t::hwb bit set, indicating that the egressed
+ * buffers should be returned to the stack.
+ *
+ * Applications can allocate and initialize buffer stacks with the
+ * gxio_mpipe_alloc_buffer_stacks() and gxio_mpipe_init_buffer_stack()
+ * APIs.
+ *
+ * The application must also register the memory pages that will hold
+ * packets.  This requires calling gxio_mpipe_register_page() for each
+ * memory page that will hold packets allocated by the application for
+ * a given buffer stack.  Since each buffer stack is limited to 16
+ * registered pages, it may be necessary to use huge pages, or even
+ * extremely huge pages, to hold all the buffers.
+ *
+ * @subsection mpipe__iqueue NotifRings
+ *
+ * Each NotifRing is a region of shared memory, allocated by the
+ * application, to which the mPIPE delivers packet descriptors
+ * (::gxio_mpipe_idesc_t).  The application can allocate them via
+ * gxio_mpipe_alloc_notif_rings().  The application can then either
+ * explicitly initialize them with gxio_mpipe_init_notif_ring() and
+ * then read from them manually, or can make use of the convenience
+ * wrappers provided by @ref gxio_mpipe_wrappers.
+ *
+ * @section mpipe__egress mPIPE Egress Hardware
+ *
+ * Applications use eDMA rings to queue packets for egress.  The
+ * application can allocate them via gxio_mpipe_alloc_edma_rings().
+ * The application can then either explicitly initialize them with
+ * gxio_mpipe_init_edma_ring() and then write to them manually, or
+ * can make use of the convenience wrappers provided by
+ * @ref gxio_mpipe_wrappers.
+ *
+ * @section gxio__shortcomings Plans for Future API Revisions
+ *
+ * The API defined here is only an initial version of the mPIPE API.
+ * Future plans include:
+ *
+ * - Higher level wrapper functions to provide common initialization
+ * patterns.  This should help users start writing mPIPE programs
+ * without having to learn the details of the hardware.
+ *
+ * - Support for reset and deallocation of resources, including
+ * cleanup upon application shutdown.
+ *
+ * - Support for calling these APIs in the BME.
+ *
+ * - Support for IO interrupts.
+ *
+ * - Clearer definitions of thread safety guarantees.
+ *
+ * @section gxio__mpipe_examples Examples
+ *
+ * See the following mPIPE example programs for more information about
+ * allocating mPIPE resources and using them in real applications:
+ *
+ * - @ref mpipe/ingress/app.c : Receiving packets.
+ *
+ * - @ref mpipe/forward/app.c : Forwarding packets.
+ *
+ * Note that there are several more examples.
+ */
+
+/* Flags that can be passed to resource allocation functions. */
+enum gxio_mpipe_alloc_flags_e {
+	/* Require an allocation to start at a specified resource index. */
+	GXIO_MPIPE_ALLOC_FIXED = HV_MPIPE_ALLOC_FIXED,
+};
+
+/* Flags that can be passed to memory registration functions. */
+enum gxio_mpipe_mem_flags_e {
+	/* Do not fill L3 when writing, and invalidate lines upon egress. */
+	GXIO_MPIPE_MEM_FLAG_NT_HINT = IORPC_MEM_BUFFER_FLAG_NT_HINT,
+
+	/* L3 cache fills should only populate IO cache ways. */
+	GXIO_MPIPE_MEM_FLAG_IO_PIN = IORPC_MEM_BUFFER_FLAG_IO_PIN,
+};
+
+/* An ingress packet descriptor.  When a packet arrives, the mPIPE
+ * hardware generates this structure and writes it into a NotifRing.
+ */
+typedef MPIPE_PDESC_t gxio_mpipe_idesc_t;
+
+/* An egress command descriptor.  Applications write this structure
+ * into eDMA rings and the hardware performs the indicated operation
+ * (normally involving egressing some bytes).  Note that egressing a
+ * single packet may involve multiple egress command descriptors.
+ */
+typedef MPIPE_EDMA_DESC_t gxio_mpipe_edesc_t;
+
+/* Get the "va" field from an "idesc".
+ *
+ * This is the address at which the ingress hardware copied the first
+ * byte of the packet.
+ *
+ * If the classifier detected a custom header, then this will point to
+ * the custom header, and gxio_mpipe_idesc_get_l2_start() will point
+ * to the actual L2 header.
+ *
+ * Note that this value may be misleading if "idesc->be" is set.
+ *
+ * @param idesc An ingress packet descriptor.
+ */
+static inline unsigned char *gxio_mpipe_idesc_get_va(gxio_mpipe_idesc_t *idesc)
+{
+	return (unsigned char *)(long)idesc->va;
+}
+
+/* Get the "xfer_size" from an "idesc".
+ *
+ * This is the actual number of packet bytes transferred into memory
+ * by the hardware.
+ *
+ * Note that this value may be misleading if "idesc->be" is set.
+ *
+ * @param idesc An ingress packet descriptor.
+ *
+ * ISSUE: Is this the best name for this?
+ * FIXME: Add more docs about chaining, clipping, etc.
+ */
+static inline unsigned int gxio_mpipe_idesc_get_xfer_size(gxio_mpipe_idesc_t
+							  *idesc)
+{
+	return idesc->l2_size;
+}
+
+/* Get the "l2_offset" from an "idesc".
+ *
+ * Extremely customized classifiers might not support this function.
+ *
+ * This is the number of bytes between the "va" and the L2 header.
+ *
+ * The L2 header consists of a destination mac address, a source mac
+ * address, and an initial ethertype.  Various initial ethertypes
+ * allow encoding extra information in the L2 header, often including
+ * a vlan, and/or a new ethertype.
+ *
+ * Note that the "l2_offset" will be non-zero if (and only if) the
+ * classifier processed a custom header for the packet.
+ *
+ * @param idesc An ingress packet descriptor.
+ */
+static inline uint8_t gxio_mpipe_idesc_get_l2_offset(gxio_mpipe_idesc_t *idesc)
+{
+	return (idesc->custom1 >> 32) & 0xFF;
+}
+
+/* Get the "l2_start" from an "idesc".
+ *
+ * This is simply gxio_mpipe_idesc_get_va() plus
+ * gxio_mpipe_idesc_get_l2_offset().
+ *
+ * @param idesc An ingress packet descriptor.
+ */
+static inline unsigned char *gxio_mpipe_idesc_get_l2_start(gxio_mpipe_idesc_t
+							   *idesc)
+{
+	unsigned char *va = gxio_mpipe_idesc_get_va(idesc);
+	return va + gxio_mpipe_idesc_get_l2_offset(idesc);
+}
+
+/* Get the "l2_length" from an "idesc".
+ *
+ * This is simply gxio_mpipe_idesc_get_xfer_size() minus
+ * gxio_mpipe_idesc_get_l2_offset().
+ *
+ * @param idesc An ingress packet descriptor.
+ */
+static inline unsigned int gxio_mpipe_idesc_get_l2_length(gxio_mpipe_idesc_t
+							  *idesc)
+{
+	unsigned int xfer_size = idesc->l2_size;
+	return xfer_size - gxio_mpipe_idesc_get_l2_offset(idesc);
+}
+
+/* A context object used to manage mPIPE hardware resources. */
+typedef struct {
+
+	/* File descriptor for calling up to Linux (and thus the HV). */
+	int fd;
+
+	/* The VA at which configuration registers are mapped. */
+	char *mmio_cfg_base;
+
+	/* The VA at which IDMA, EDMA, and buffer manager are mapped. */
+	char *mmio_fast_base;
+
+	/* The "initialized" buffer stacks. */
+	gxio_mpipe_rules_stacks_t __stacks;
+
+} gxio_mpipe_context_t;
+
+/* This is only used internally, but it's most easily made visible here. */
+typedef gxio_mpipe_context_t gxio_mpipe_info_context_t;
+
+/* Initialize an mPIPE context.
+ *
+ * This function allocates an mPIPE "service domain" and maps the MMIO
+ * registers into the caller's VA space.
+ *
+ * @param context Context object to be initialized.
+ * @param mpipe_instance Instance number of mPIPE shim to be controlled via
+ *  context.
+ */
+extern int gxio_mpipe_init(gxio_mpipe_context_t *context,
+			   unsigned int mpipe_instance);
+
+/* Destroy an mPIPE context.
+ *
+ * This function frees the mPIPE "service domain" and unmaps the MMIO
+ * registers from the caller's VA space.
+ *
+ * If a user process exits without calling this routine, the kernel
+ * will destroy the mPIPE context as part of process teardown.
+ *
+ * @param context Context object to be destroyed.
+ */
+extern int gxio_mpipe_destroy(gxio_mpipe_context_t *context);
+
+/*****************************************************************
+ *                         Buffer Stacks                          *
+ ******************************************************************/
+
+/* Allocate a set of buffer stacks.
+ *
+ * The return value is NOT interesting if count is zero.
+ *
+ * @param context An initialized mPIPE context.
+ * @param count Number of stacks required.
+ * @param first Index of first stack if ::GXIO_MPIPE_ALLOC_FIXED flag is set,
+ *   otherwise ignored.
+ * @param flags Flag bits from ::gxio_mpipe_alloc_flags_e.
+ * @return Index of first allocated buffer stack, or
+ * ::GXIO_MPIPE_ERR_NO_BUFFER_STACK if allocation failed.
+ */
+extern int gxio_mpipe_alloc_buffer_stacks(gxio_mpipe_context_t *context,
+					  unsigned int count,
+					  unsigned int first,
+					  unsigned int flags);
+
+/* Enum codes for buffer sizes supported by mPIPE. */
+typedef enum {
+	/* 128 byte packet data buffer. */
+	GXIO_MPIPE_BUFFER_SIZE_128 = MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_128,
+	/* 256 byte packet data buffer. */
+	GXIO_MPIPE_BUFFER_SIZE_256 = MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_256,
+	/* 512 byte packet data buffer. */
+	GXIO_MPIPE_BUFFER_SIZE_512 = MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_512,
+	/* 1024 byte packet data buffer. */
+	GXIO_MPIPE_BUFFER_SIZE_1024 = MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_1024,
+	/* 1664 byte packet data buffer. */
+	GXIO_MPIPE_BUFFER_SIZE_1664 = MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_1664,
+	/* 4096 byte packet data buffer. */
+	GXIO_MPIPE_BUFFER_SIZE_4096 = MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_4096,
+	/* 10368 byte packet data buffer. */
+	GXIO_MPIPE_BUFFER_SIZE_10368 =
+		MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_10368,
+	/* 16384 byte packet data buffer. */
+	GXIO_MPIPE_BUFFER_SIZE_16384 = MPIPE_BSM_INIT_DAT_1__SIZE_VAL_BSZ_16384
+} gxio_mpipe_buffer_size_enum_t;
+
+/* Convert a buffer size in bytes into a buffer size enum. */
+extern gxio_mpipe_buffer_size_enum_t
+gxio_mpipe_buffer_size_to_buffer_size_enum(size_t size);
+
+/* Convert a buffer size enum into a buffer size in bytes. */
+extern size_t
+gxio_mpipe_buffer_size_enum_to_buffer_size(gxio_mpipe_buffer_size_enum_t
+					   buffer_size_enum);
+
+/* Calculate the number of bytes required to store a given number of
+ * buffers in the memory registered with a buffer stack via
+ * gxio_mpipe_init_buffer_stack().
+ */
+extern size_t gxio_mpipe_calc_buffer_stack_bytes(unsigned long buffers);
+
+/* Initialize a buffer stack.  This function binds a region of memory
+ * to be used by the hardware for storing buffer addresses pushed via
+ * gxio_mpipe_push_buffer() or as the result of sending a buffer out
+ * the egress with the 'push to stack when done' bit set.  Once this
+ * function returns, the memory region's contents may be arbitrarily
+ * modified by the hardware at any time and software should not access
+ * the memory region again.
+ *
+ * @param context An initialized mPIPE context.
+ * @param stack The buffer stack index.
+ * @param buffer_size_enum The size of each buffer in the buffer stack,
+ * as an enum.
+ * @param mem The address of the buffer stack.  This memory must be
+ * physically contiguous and aligned to a 64kB boundary.
+ * @param mem_size The size of the buffer stack, in bytes.
+ * @param mem_flags ::gxio_mpipe_mem_flags_e memory flags.
+ * @return Zero on success, ::GXIO_MPIPE_ERR_INVAL_BUFFER_SIZE if
+ * buffer_size_enum is invalid, ::GXIO_MPIPE_ERR_BAD_BUFFER_STACK if
+ * stack has not been allocated.
+ */
+extern int gxio_mpipe_init_buffer_stack(gxio_mpipe_context_t *context,
+					unsigned int stack,
+					gxio_mpipe_buffer_size_enum_t
+					buffer_size_enum, void *mem,
+					size_t mem_size,
+					unsigned int mem_flags);
+
+/* Push a buffer onto a previously initialized buffer stack.
+ *
+ * The size of the buffer being pushed must match the size that was
+ * registered with gxio_mpipe_init_buffer_stack().  All packet buffer
+ * addresses are 128-byte aligned; the low 7 bits of the specified
+ * buffer address will be ignored.
+ *
+ * @param context An initialized mPIPE context.
+ * @param stack The buffer stack index.
+ * @param buffer The buffer (the low seven bits are ignored).
+ */
+static inline void gxio_mpipe_push_buffer(gxio_mpipe_context_t *context,
+					  unsigned int stack, void *buffer)
+{
+	MPIPE_BSM_REGION_ADDR_t offset = { {0} };
+	MPIPE_BSM_REGION_VAL_t val = { {0} };
+
+	/*
+	 * The mmio_fast_base region starts at the IDMA region, so subtract
+	 * off that initial offset.
+	 */
+	offset.region =
+		MPIPE_MMIO_ADDR__REGION_VAL_BSM -
+		MPIPE_MMIO_ADDR__REGION_VAL_IDMA;
+	offset.stack = stack;
+
+#if __SIZEOF_POINTER__ == 4
+	val.va = ((ulong) buffer) >> MPIPE_BSM_REGION_VAL__VA_SHIFT;
+#else
+	val.va = ((long)buffer) >> MPIPE_BSM_REGION_VAL__VA_SHIFT;
+#endif
+
+	__gxio_mmio_write(context->mmio_fast_base + offset.word, val.word);
+}
+
+/* Pop a buffer off of a previously initialized buffer stack.
+ *
+ * @param context An initialized mPIPE context.
+ * @param stack The buffer stack index.
+ * @return The buffer, or NULL if the stack is empty.
+ */
+static inline void *gxio_mpipe_pop_buffer(gxio_mpipe_context_t *context,
+					  unsigned int stack)
+{
+	MPIPE_BSM_REGION_ADDR_t offset = { {0} };
+
+	/*
+	 * The mmio_fast_base region starts at the IDMA region, so subtract
+	 * off that initial offset.
+	 */
+	offset.region =
+		MPIPE_MMIO_ADDR__REGION_VAL_BSM -
+		MPIPE_MMIO_ADDR__REGION_VAL_IDMA;
+	offset.stack = stack;
+
+	while (1) {
+		/*
+		 * Case 1: val.c == ..._UNCHAINED, va is non-zero.
+		 * Case 2: val.c == ..._INVALID, va is zero.
+		 * Case 3: val.c == ..._NOT_RDY, va is zero.
+		 */
+		MPIPE_BSM_REGION_VAL_t val;
+		val.word =
+			__gxio_mmio_read(context->mmio_fast_base +
+					 offset.word);
+
+		/*
+		 * Handle case 1 and 2 by returning the buffer (or NULL).
+		 * Handle case 3 by waiting for the prefetch buffer to refill.
+		 */
+		if (val.c != MPIPE_EDMA_DESC_WORD1__C_VAL_NOT_RDY)
+			return (void *)((unsigned long)val.
+					va << MPIPE_BSM_REGION_VAL__VA_SHIFT);
+	}
+}
+
+/*****************************************************************
+ *                          NotifRings                            *
+ ******************************************************************/
+
+/* Allocate a set of NotifRings.
+ *
+ * The return value is NOT interesting if count is zero.
+ *
+ * Note that NotifRings are allocated in chunks, so allocating one at
+ * a time is much less efficient than allocating several at once.
+ *
+ * @param context An initialized mPIPE context.
+ * @param count Number of NotifRings required.
+ * @param first Index of first NotifRing if ::GXIO_MPIPE_ALLOC_FIXED flag
+ *   is set, otherwise ignored.
+ * @param flags Flag bits from ::gxio_mpipe_alloc_flags_e.
+ * @return Index of first allocated buffer NotifRing, or
+ * ::GXIO_MPIPE_ERR_NO_NOTIF_RING if allocation failed.
+ */
+extern int gxio_mpipe_alloc_notif_rings(gxio_mpipe_context_t *context,
+					unsigned int count, unsigned int first,
+					unsigned int flags);
+
+/* Initialize a NotifRing, using the given memory and size.
+ *
+ * @param context An initialized mPIPE context.
+ * @param ring The NotifRing index.
+ * @param mem A physically contiguous region of memory to be filled
+ * with a ring of ::gxio_mpipe_idesc_t structures.
+ * @param mem_size Number of bytes in the ring.  Must be 128, 512,
+ * 2048, or 65536 * sizeof(gxio_mpipe_idesc_t).
+ * @param mem_flags ::gxio_mpipe_mem_flags_e memory flags.
+ *
+ * @return 0 on success, ::GXIO_MPIPE_ERR_BAD_NOTIF_RING or
+ * ::GXIO_ERR_INVAL_MEMORY_SIZE on failure.
+ */
+extern int gxio_mpipe_init_notif_ring(gxio_mpipe_context_t *context,
+				      unsigned int ring,
+				      void *mem, size_t mem_size,
+				      unsigned int mem_flags);
+
+/* Configure an interrupt to be sent to a tile on incoming NotifRing
+ *  traffic.  Once an interrupt is sent for a particular ring, no more
+ *  will be sent until gxio_mica_enable_notif_ring_interrupt() is called.
+ *
+ * @param context An initialized mPIPE context.
+ * @param x X coordinate of interrupt target tile.
+ * @param y Y coordinate of interrupt target tile.
+ * @param i Index of the IPI register which will receive the interrupt.
+ * @param e Specific event which will be set in the target IPI register when
+ * the interrupt occurs.
+ * @param ring The NotifRing index.
+ * @return Zero on success, GXIO_ERR_INVAL if params are out of range.
+ */
+extern int gxio_mpipe_request_notif_ring_interrupt(gxio_mpipe_context_t
+						   *context, int x, int y,
+						   int i, int e,
+						   unsigned int ring);
+
+/* Enable an interrupt on incoming NotifRing traffic.
+ *
+ * @param context An initialized mPIPE context.
+ * @param ring The NotifRing index.
+ * @return Zero on success, GXIO_ERR_INVAL if params are out of range.
+ */
+extern int gxio_mpipe_enable_notif_ring_interrupt(gxio_mpipe_context_t
+						  *context, unsigned int ring);
+
+/* Map all of a client's memory via the given IOTLB.
+ * @param context An initialized mPIPE context.
+ * @param iotlb IOTLB index.
+ * @param pte Page table entry.
+ * @param flags Flags.
+ * @return Zero on success, or a negative error code.
+ */
+extern int gxio_mpipe_register_client_memory(gxio_mpipe_context_t *context,
+					     unsigned int iotlb, HV_PTE pte,
+					     unsigned int flags);
+
+/*****************************************************************
+ *                        Notif Groups                            *
+ ******************************************************************/
+
+/* Allocate a set of NotifGroups.
+ *
+ * The return value is NOT interesting if count is zero.
+ *
+ * @param context An initialized mPIPE context.
+ * @param count Number of NotifGroups required.
+ * @param first Index of first NotifGroup if ::GXIO_MPIPE_ALLOC_FIXED flag
+ *   is set, otherwise ignored.
+ * @param flags Flag bits from ::gxio_mpipe_alloc_flags_e.
+ * @return Index of first allocated buffer NotifGroup, or
+ * ::GXIO_MPIPE_ERR_NO_NOTIF_GROUP if allocation failed.
+ */
+extern int gxio_mpipe_alloc_notif_groups(gxio_mpipe_context_t *context,
+					 unsigned int count,
+					 unsigned int first,
+					 unsigned int flags);
+
+/* Add a NotifRing to a NotifGroup.  This only sets a bit in the
+ * application's 'group' object; the hardware NotifGroup can be
+ * initialized by passing 'group' to gxio_mpipe_init_notif_group() or
+ * gxio_mpipe_init_notif_group_and_buckets().
+ */
+static inline void
+gxio_mpipe_notif_group_add_ring(gxio_mpipe_notif_group_bits_t *bits, int ring)
+{
+	bits->ring_mask[ring / 64] |= (1ull << (ring % 64));
+}
+
+/* Set a particular NotifGroup bitmask.  Since the load balancer
+ * makes decisions based on both bucket and NotifGroup state, most
+ * applications should use gxio_mpipe_init_notif_group_and_buckets()
+ * rather than using this function to configure just a NotifGroup.
+ */
+extern int gxio_mpipe_init_notif_group(gxio_mpipe_context_t *context,
+				       unsigned int group,
+				       gxio_mpipe_notif_group_bits_t bits);
+
+/*****************************************************************
+ *                         Load Balancer                          *
+ ******************************************************************/
+
+/* Allocate a set of load balancer buckets.
+ *
+ * The return value is NOT interesting if count is zero.
+ *
+ * Note that buckets are allocated in chunks, so allocating one at
+ * a time is much less efficient than allocating several at once.
+ *
+ * Note that the buckets are actually divided into two sub-ranges, of
+ * different sizes, and different chunk sizes, and the range you get
+ * by default is determined by the size of the request.  Allocations
+ * cannot span the two sub-ranges.
+ *
+ * @param context An initialized mPIPE context.
+ * @param count Number of buckets required.
+ * @param first Index of first bucket if ::GXIO_MPIPE_ALLOC_FIXED flag is set,
+ *   otherwise ignored.
+ * @param flags Flag bits from ::gxio_mpipe_alloc_flags_e.
+ * @return Index of first allocated buffer bucket, or
+ * ::GXIO_MPIPE_ERR_NO_BUCKET if allocation failed.
+ */
+extern int gxio_mpipe_alloc_buckets(gxio_mpipe_context_t *context,
+				    unsigned int count, unsigned int first,
+				    unsigned int flags);
+
+/* The legal modes for gxio_mpipe_bucket_info_t and
+ * gxio_mpipe_init_notif_group_and_buckets().
+ *
+ * All modes except ::GXIO_MPIPE_BUCKET_ROUND_ROBIN expect that the user
+ * will allocate a power-of-two number of buckets and initialize them
+ * to the same mode.  The classifier program then uses the appropriate
+ * number of low bits from the incoming packet's flow hash to choose a
+ * load balancer bucket.  Based on that bucket's load balancing mode,
+ * reference count, and currently active NotifRing, the load balancer
+ * chooses the NotifRing to which the packet will be delivered.
+ */
+typedef enum {
+	/* All packets for a bucket go to the same NotifRing unless the
+	 * NotifRing gets full, in which case packets will be dropped.  If
+	 * the bucket reference count ever reaches zero, a new NotifRing may
+	 * be chosen.
+	 */
+	GXIO_MPIPE_BUCKET_DYNAMIC_FLOW_AFFINITY =
+		MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_DFA,
+
+	/* All packets for a bucket always go to the same NotifRing.
+	 */
+	GXIO_MPIPE_BUCKET_STATIC_FLOW_AFFINITY =
+		MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_FIXED,
+
+	/* All packets for a bucket go to the least full NotifRing in the
+	 * group, providing load balancing round robin behavior.
+	 */
+	GXIO_MPIPE_BUCKET_ROUND_ROBIN =
+		MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_ALWAYS_PICK,
+
+	/* All packets for a bucket go to the same NotifRing unless the
+	 * NotifRing gets full, at which point the bucket starts using the
+	 * least full NotifRing in the group.  If all NotifRings in the
+	 * group are full, packets will be dropped.
+	 */
+	GXIO_MPIPE_BUCKET_STICKY_FLOW_LOCALITY =
+		MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_STICKY,
+
+	/* All packets for a bucket go to the same NotifRing unless the
+	 * NotifRing gets full, or a random timer fires, at which point the
+	 * bucket starts using the least full NotifRing in the group.  If
+	 * all NotifRings in the group are full, packets will be dropped.
+	 * WARNING: This mode is BROKEN on chips with fewer than 64 tiles.
+	 */
+	GXIO_MPIPE_BUCKET_PREFER_FLOW_LOCALITY =
+		MPIPE_LBL_INIT_DAT_BSTS_TBL__MODE_VAL_STICKY_RAND,
+
+} gxio_mpipe_bucket_mode_t;
+
+/* Copy a set of bucket initialization values into the mPIPE
+ * hardware.  Since the load balancer makes decisions based on both
+ * bucket and NotifGroup state, most applications should use
+ * gxio_mpipe_init_notif_group_and_buckets() rather than using this
+ * function to configure a single bucket.
+ *
+ * @param context An initialized mPIPE context.
+ * @param bucket Bucket index to be initialized.
+ * @param bucket_info Initial reference count, NotifRing index, and mode.
+ * @return 0 on success, ::GXIO_MPIPE_ERR_BAD_BUCKET on failure.
+ */
+extern int gxio_mpipe_init_bucket(gxio_mpipe_context_t *context,
+				  unsigned int bucket,
+				  gxio_mpipe_bucket_info_t bucket_info);
+
+/* Initializes a group and range of buckets and range of rings such
+ * that the load balancer runs a particular load balancing function.
+ *
+ * First, the group is initialized with the given rings.
+ *
+ * Second, each bucket is initialized with the mode and group, and a
+ * ring chosen round-robin from the given rings.
+ *
+ * Normally, the classifier picks a bucket, and then the load balancer
+ * picks a ring, based on the bucket's mode, group, and current ring,
+ * possibly updating the bucket's ring.
+ *
+ * @param context An initialized mPIPE context.
+ * @param group The group.
+ * @param ring The first ring.
+ * @param num_rings The number of rings.
+ * @param bucket The first bucket.
+ * @param num_buckets The number of buckets.
+ * @param mode The load balancing mode.
+ *
+ * @return 0 on success, ::GXIO_MPIPE_ERR_BAD_BUCKET,
+ * ::GXIO_MPIPE_ERR_BAD_NOTIF_GROUP, or
+ * ::GXIO_MPIPE_ERR_BAD_NOTIF_RING on failure.
+ */
+extern int gxio_mpipe_init_notif_group_and_buckets(gxio_mpipe_context_t
+						   *context,
+						   unsigned int group,
+						   unsigned int ring,
+						   unsigned int num_rings,
+						   unsigned int bucket,
+						   unsigned int num_buckets,
+						   gxio_mpipe_bucket_mode_t
+						   mode);
+
+/* Return credits to a NotifRing and/or bucket.
+ *
+ * @param context An initialized mPIPE context.
+ * @param ring The NotifRing index, or -1.
+ * @param bucket The bucket, or -1.
+ * @param count The number of credits to return.
+ */
+static inline void gxio_mpipe_credit(gxio_mpipe_context_t *context,
+				     int ring, int bucket, unsigned int count)
+{
+	/* NOTE: Fancy struct initialization would break "C89" header test. */
+
+	MPIPE_IDMA_RELEASE_REGION_ADDR_t offset = { {0} };
+	MPIPE_IDMA_RELEASE_REGION_VAL_t val = { {0} };
+
+	/*
+	 * The mmio_fast_base region starts at the IDMA region, so subtract
+	 * off that initial offset.
+	 */
+	offset.region =
+		MPIPE_MMIO_ADDR__REGION_VAL_IDMA -
+		MPIPE_MMIO_ADDR__REGION_VAL_IDMA;
+	offset.ring = ring;
+	offset.bucket = bucket;
+	offset.ring_enable = (ring >= 0);
+	offset.bucket_enable = (bucket >= 0);
+	val.count = count;
+
+	__gxio_mmio_write(context->mmio_fast_base + offset.word, val.word);
+}
+
+/*****************************************************************
+ *                         Egress Rings                           *
+ ******************************************************************/
+
+/* Allocate a set of eDMA rings.
+ *
+ * The return value is NOT interesting if count is zero.
+ *
+ * @param context An initialized mPIPE context.
+ * @param count Number of eDMA rings required.
+ * @param first Index of first eDMA ring if ::GXIO_MPIPE_ALLOC_FIXED flag
+ *   is set, otherwise ignored.
+ * @param flags Flag bits from ::gxio_mpipe_alloc_flags_e.
+ * @return Index of first allocated buffer eDMA ring, or
+ * ::GXIO_MPIPE_ERR_NO_EDMA_RING if allocation failed.
+ */
+extern int gxio_mpipe_alloc_edma_rings(gxio_mpipe_context_t *context,
+				       unsigned int count, unsigned int first,
+				       unsigned int flags);
+
+/* Initialize an eDMA ring, using the given memory and size.
+ *
+ * @param context An initialized mPIPE context.
+ * @param ring The eDMA ring index.
+ * @param channel The channel to use.  This must be one of the channels
+ * associated with the context's set of open links.
+ * @param mem A physically contiguous region of memory to be filled
+ * with a ring of ::gxio_mpipe_edesc_t structures.
+ * @param mem_size Number of bytes in the ring.  Must be 512, 2048,
+ * 8192 or 65536, times 16 (i.e. sizeof(gxio_mpipe_edesc_t)).
+ * @param mem_flags ::gxio_mpipe_mem_flags_e memory flags.
+ *
+ * @return 0 on success, ::GXIO_MPIPE_ERR_BAD_EDMA_RING or
+ * ::GXIO_ERR_INVAL_MEMORY_SIZE on failure.
+ */
+extern int gxio_mpipe_init_edma_ring(gxio_mpipe_context_t *context,
+				     unsigned int ring, unsigned int channel,
+				     void *mem, size_t mem_size,
+				     unsigned int mem_flags);
+
+/*****************************************************************
+ *                      Classifier Program                        *
+ ******************************************************************/
+
+/*
+ *
+ * Functions for loading or configuring the mPIPE classifier program.
+ *
+ * The mPIPE classification processors all run a special "classifier"
+ * program which, for each incoming packet, parses the packet headers,
+ * encodes some packet metadata in the "idesc", and either drops the
+ * packet, or picks a notif ring to handle the packet, and a buffer
+ * stack to contain the packet, usually based on the channel, VLAN,
+ * dMAC, flow hash, and packet size, under the guidance of the "rules"
+ * API described below.
+ *
+ * @section gxio_mpipe_classifier_default Default Classifier
+ *
+ * The MDE provides a simple "default" classifier program.  It is
+ * shipped as source in "$TILERA_ROOT/src/sys/mpipe/classifier.c",
+ * which serves as its official documentation.  It is shipped as a
+ * binary program in "$TILERA_ROOT/tile/boot/classifier", which is
+ * automatically included in bootroms created by "tile-monitor", and
+ * is automatically loaded by the hypervisor at boot time.
+ *
+ * The L2 analysis handles LLC packets, SNAP packets, and "VLAN
+ * wrappers" (keeping the outer VLAN).
+ *
+ * The L3 analysis handles IPv4 and IPv6, dropping packets with bad
+ * IPv4 header checksums, requesting computation of a TCP/UDP checksum
+ * if appropriate, and hashing the dest and src IP addresses, plus the
+ * ports for TCP/UDP packets, into the flow hash.  No special analysis
+ * is done for "fragmented" packets or "tunneling" protocols.  Thus,
+ * the first fragment of a fragmented TCP/UDP packet is hashed using
+ * src/dest IP address and ports and all subsequent fragments are only
+ * hashed according to src/dest IP address.
+ *
+ * The L3 analysis handles other packets too, hashing the dMAC
+ * smac into a flow hash.
+ *
+ * The channel, VLAN, and dMAC used to pick a "rule" (see the
+ * "rules" APIs below), which in turn is used to pick a buffer stack
+ * (based on the packet size) and a bucket (based on the flow hash).
+ *
+ * To receive traffic matching a particular (channel/VLAN/dMAC
+ * pattern, an application should allocate its own buffer stacks and
+ * load balancer buckets, and map traffic to those stacks and buckets,
+ * as decribed by the "rules" API below.
+ *
+ * Various packet metadata is encoded in the idesc.  The flow hash is
+ * four bytes at 0x0C.  The VLAN is two bytes at 0x10.  The ethtype is
+ * two bytes at 0x12.  The l3 start is one byte at 0x14.  The l4 start
+ * is one byte at 0x15 for IPv4 and IPv6 packets, and otherwise zero.
+ * The protocol is one byte at 0x16 for IPv4 and IPv6 packets, and
+ * otherwise zero.
+ *
+ * @section gxio_mpipe_classifier_custom Custom Classifiers.
+ *
+ * A custom classifier may be created using "tile-mpipe-cc" with a
+ * customized version of the default classifier sources.
+ *
+ * The custom classifier may be included in bootroms using the
+ * "--classifier" option to "tile-monitor", or loaded dynamically
+ * using gxio_mpipe_classifier_load_from_file().
+ *
+ * Be aware that "extreme" customizations may break the assumptions of
+ * the "rules" APIs described below, but simple customizations, such
+ * as adding new packet metadata, should be fine.
+ */
+
+/* A set of classifier rules, plus a context. */
+typedef struct {
+
+	/* The context. */
+	gxio_mpipe_context_t *context;
+
+	/* The actual rules. */
+	gxio_mpipe_rules_list_t list;
+
+} gxio_mpipe_rules_t;
+
+/* Initialize a classifier program rules list.
+ *
+ * This function can be called on a previously initialized rules list
+ * to discard any previously added rules.
+ *
+ * @param rules Rules list to initialize.
+ * @param context An initialized mPIPE context.
+ */
+extern void gxio_mpipe_rules_init(gxio_mpipe_rules_t *rules,
+				  gxio_mpipe_context_t *context);
+
+/* Begin a new rule on the indicated rules list.
+ *
+ * Note that an empty rule matches all packets, but an empty rule list
+ * matches no packets.
+ *
+ * @param rules Rules list to which new rule is appended.
+ * @param bucket First load balancer bucket to which packets will be
+ * delivered.
+ * @param num_buckets Number of buckets (must be a power of two) across
+ * which packets will be distributed based on the "flow hash".
+ * @param stacks Either NULL, to assign each packet to the smallest
+ * initialized buffer stack which does not induce chaining (and to
+ * drop packets which exceed the largest initialized buffer stack
+ * buffer size), or an array, with each entry indicating which buffer
+ * stack should be used for packets up to that size (with 255
+ * indicating that those packets should be dropped).
+ * @return 0 on success, or a negative error code on failure.
+ */
+extern int gxio_mpipe_rules_begin(gxio_mpipe_rules_t *rules,
+				  unsigned int bucket,
+				  unsigned int num_buckets,
+				  gxio_mpipe_rules_stacks_t *stacks);
+
+/* Set the headroom of the current rule.
+ *
+ * @param rules Rules list whose current rule will be modified.
+ * @param headroom The headroom.
+ * @return 0 on success, or a negative error code on failure.
+ */
+extern int gxio_mpipe_rules_set_headroom(gxio_mpipe_rules_t *rules,
+					 uint8_t headroom);
+
+/* Indicate that packets from a particular channel can be delivered
+ * to the buckets and buffer stacks associated with the current rule.
+ *
+ * Channels added must be associated with links opened by the mPIPE context
+ * used in gxio_mpipe_rules_init().  A rule with no channels is equivalent
+ * to a rule naming all such associated channels.
+ *
+ * @param rules Rules list whose current rule will be modified.
+ * @param channel The channel to add.
+ * @return 0 on success, or a negative error code on failure.
+ */
+extern int gxio_mpipe_rules_add_channel(gxio_mpipe_rules_t *rules,
+					unsigned int channel);
+
+/* Commit rules.
+ *
+ * The rules are sent to the hypervisor, where they are combined with
+ * the rules from other apps, and used to program the hardware classifier.
+ *
+ * Note that if this function returns an error, then the rules will NOT
+ * have been committed, even if the error is due to interactions with
+ * rules from another app.
+ *
+ * @param rules Rules list to commit.
+ * @return 0 on success, or a negative error code on failure.
+ */
+extern int gxio_mpipe_rules_commit(gxio_mpipe_rules_t *rules);
+
+/*****************************************************************
+ *                     Ingress Queue Wrapper                      *
+ ******************************************************************/
+
+/*
+ *
+ * Convenience functions for receiving packets from a NotifRing and
+ * sending packets via an eDMA ring.
+ *
+ * The mpipe ingress and egress hardware uses shared memory packet
+ * descriptors to describe packets that have arrived on ingress or
+ * are destined for egress.  These descriptors are stored in shared
+ * memory ring buffers and written or read by hardware as necessary.
+ * The gxio library provides wrapper functions that manage the head and
+ * tail pointers for these rings, allowing the user to easily read or
+ * write packet descriptors.
+ *
+ * The initialization interface for ingress and egress rings is quite
+ * similar.  For example, to create an ingress queue, the user passes
+ * a ::gxio_mpipe_iqueue_t state object, a ring number from
+ * gxio_mpipe_alloc_notif_rings(), and the address of memory to hold a
+ * ring buffer to the gxio_mpipe_iqueue_init() function.  The function
+ * returns success when the state object has been initialized and the
+ * hardware configured to deliver packets to the specified ring
+ * buffer.  Similarly, gxio_mpipe_equeue_init() takes a
+ * ::gxio_mpipe_equeue_t state object, a ring number from
+ * gxio_mpipe_alloc_edma_rings(), and a shared memory buffer.
+ *
+ * @section gxio_mpipe_iqueue Working with Ingress Queues
+ *
+ * Once initialized, the gxio_mpipe_iqueue_t API provides two flows
+ * for getting the ::gxio_mpipe_idesc_t packet descriptor associated
+ * with incoming packets.  The simplest is to call
+ * gxio_mpipe_iqueue_get() or gxio_mpipe_iqueue_try_get().  These
+ * functions copy the oldest packet descriptor out of the NotifRing and
+ * into a descriptor provided by the caller.  They also immediately
+ * inform the hardware that a descriptor has been processed.
+ *
+ * For applications with stringent performance requirements, higher
+ * efficiency can be achieved by avoiding the packet descriptor copy
+ * and processing multiple descriptors at once.  The
+ * gxio_mpipe_iqueue_peek() and gxio_mpipe_iqueue_try_peek() functions
+ * allow such optimizations.  These functions provide a pointer to the
+ * next valid ingress descriptor in the NotifRing's shared memory ring
+ * buffer, and a count of how many contiguous descriptors are ready to
+ * be processed.  The application can then process any number of those
+ * descriptors in place, calling gxio_mpipe_iqueue_consume() to inform
+ * the hardware after each one has been processed.
+ *
+ * @section gxio_mpipe_equeue Working with Egress Queues
+ *
+ * Similarly, the egress queue API provides a high-performance
+ * interface plus a simple wrapper for use in posting
+ * ::gxio_mpipe_edesc_t egress packet descriptors.  The simple
+ * version, gxio_mpipe_equeue_put(), allows the programmer to wait for
+ * an eDMA ring slot to become available and write a single descriptor
+ * into the ring.
+ *
+ * Alternatively, you can reserve slots in the eDMA ring using
+ * gxio_mpipe_equeue_reserve() or gxio_mpipe_equeue_try_reserve(), and
+ * then fill in each slot using gxio_mpipe_equeue_put_at().  This
+ * capability can be used to amortize the cost of reserving slots
+ * across several packets.  It also allows gather operations to be
+ * performed on a shared equeue, by ensuring that the edescs for all
+ * the fragments are all contiguous in the eDMA ring.
+ *
+ * The gxio_mpipe_equeue_reserve() and gxio_mpipe_equeue_try_reserve()
+ * functions return a 63-bit "completion slot", which is actually a
+ * sequence number, the low bits of which indicate the ring buffer
+ * index and the high bits the number of times the application has
+ * gone around the egress ring buffer.  The extra bits allow an
+ * application to check for egress completion by calling
+ * gxio_mpipe_equeue_is_complete() to see whether a particular 'slot'
+ * number has finished.  Given the maximum packet rates of the Gx
+ * processor, the 63-bit slot number will never wrap.
+ *
+ * In practice, most applications use the ::gxio_mpipe_edesc_t::hwb
+ * bit to indicate that the buffers containing egress packet data
+ * should be pushed onto a buffer stack when egress is complete.  Such
+ * applications generally do not need to know when an egress operation
+ * completes (since there is no need to free a buffer post-egress),
+ * and thus can use the optimized gxio_mpipe_equeue_reserve_fast() or
+ * gxio_mpipe_equeue_try_reserve_fast() functions, which return a 24
+ * bit "slot", instead of a 63-bit "completion slot".
+ *
+ * Once a slot has been "reserved", it MUST be filled.  If the
+ * application reserves a slot and then decides that it does not
+ * actually need it, it can set the ::gxio_mpipe_edesc_t::ns (no send)
+ * bit on the descriptor passed to gxio_mpipe_equeue_put_at() to
+ * indicate that no data should be sent.  This technique can also be
+ * used to drop an incoming packet, instead of forwarding it, since
+ * any buffer will still be pushed onto the buffer stack when the
+ * egress descriptor is processed.
+ */
+
+/* A convenient interface to a NotifRing, for use by a single thread.
+ */
+typedef struct {
+
+	/* The context. */
+	gxio_mpipe_context_t *context;
+
+	/* The actual NotifRing. */
+	gxio_mpipe_idesc_t *idescs;
+
+	/* The number of entries. */
+	unsigned long num_entries;
+
+	/* The number of entries minus one. */
+	unsigned long mask_num_entries;
+
+	/* The log2() of the number of entries. */
+	unsigned long log2_num_entries;
+
+	/* The next entry. */
+	unsigned int head;
+
+	/* The NotifRing id. */
+	unsigned int ring;
+
+#ifdef __BIG_ENDIAN__
+	/* The number of byteswapped entries. */
+	unsigned int swapped;
+#endif
+
+} gxio_mpipe_iqueue_t;
+
+/* Initialize an "iqueue".
+ *
+ * Takes the iqueue plus the same args as gxio_mpipe_init_notif_ring().
+ */
+extern int gxio_mpipe_iqueue_init(gxio_mpipe_iqueue_t *iqueue,
+				  gxio_mpipe_context_t *context,
+				  unsigned int ring,
+				  void *mem, size_t mem_size,
+				  unsigned int mem_flags);
+
+/* Advance over some old entries in an iqueue.
+ *
+ * Please see the documentation for gxio_mpipe_iqueue_consume().
+ *
+ * @param iqueue An ingress queue initialized via gxio_mpipe_iqueue_init().
+ * @param count The number of entries to advance over.
+ */
+static inline void gxio_mpipe_iqueue_advance(gxio_mpipe_iqueue_t *iqueue,
+					     int count)
+{
+	/* Advance with proper wrap. */
+	int head = iqueue->head + count;
+	iqueue->head =
+		(head & iqueue->mask_num_entries) +
+		(head >> iqueue->log2_num_entries);
+
+#ifdef __BIG_ENDIAN__
+	/* HACK: Track swapped entries. */
+	iqueue->swapped -= count;
+#endif
+}
+
+/* Release the ring and bucket for an old entry in an iqueue.
+ *
+ * Releasing the ring allows more packets to be delivered to the ring.
+ *
+ * Releasing the bucket allows flows using the bucket to be moved to a
+ * new ring when using GXIO_MPIPE_BUCKET_DYNAMIC_FLOW_AFFINITY.
+ *
+ * This function is shorthand for "gxio_mpipe_credit(iqueue->context,
+ * iqueue->ring, idesc->bucket_id, 1)", and it may be more convenient
+ * to make that underlying call, using those values, instead of
+ * tracking the entire "idesc".
+ *
+ * If packet processing is deferred, optimal performance requires that
+ * the releasing be deferred as well.
+ *
+ * Please see the documentation for gxio_mpipe_iqueue_consume().
+ *
+ * @param iqueue An ingress queue initialized via gxio_mpipe_iqueue_init().
+ * @param idesc The descriptor which was processed.
+ */
+static inline void gxio_mpipe_iqueue_release(gxio_mpipe_iqueue_t *iqueue,
+					     gxio_mpipe_idesc_t *idesc)
+{
+	gxio_mpipe_credit(iqueue->context, iqueue->ring, idesc->bucket_id, 1);
+}
+
+/* Consume a packet from an "iqueue".
+ *
+ * After processing packets peeked at via gxio_mpipe_iqueue_peek()
+ * or gxio_mpipe_iqueue_try_peek(), you must call this function, or
+ * gxio_mpipe_iqueue_advance() plus gxio_mpipe_iqueue_release(), to
+ * advance over those entries, and release their rings and buckets.
+ *
+ * You may call this function as each packet is processed, or you can
+ * wait until several packets have been processed.
+ *
+ * Note that if you are using a single bucket, and you are handling
+ * batches of N packets, then you can replace several calls to this
+ * function with calls to "gxio_mpipe_iqueue_advance(iqueue, N)" and
+ * "gxio_mpipe_credit(iqueue->context, iqueue->ring, bucket, N)".
+ *
+ * Note that if your classifier sets "idesc->nr", then you should
+ * explicitly call "gxio_mpipe_iqueue_advance(iqueue, idesc)" plus
+ * "gxio_mpipe_credit(iqueue->context, iqueue->ring, -1, 1)", to
+ * avoid incorrectly crediting the (unused) bucket.
+ *
+ * @param iqueue An ingress queue initialized via gxio_mpipe_iqueue_init().
+ * @param idesc The descriptor which was processed.
+ */
+static inline void gxio_mpipe_iqueue_consume(gxio_mpipe_iqueue_t *iqueue,
+					     gxio_mpipe_idesc_t *idesc)
+{
+	gxio_mpipe_iqueue_advance(iqueue, 1);
+	gxio_mpipe_iqueue_release(iqueue, idesc);
+}
+
+/* Peek at the next packet(s) in an "iqueue", without waiting.
+ *
+ * If no packets are available, fills idesc_ref with NULL, and then
+ * returns ::GXIO_MPIPE_ERR_IQUEUE_EMPTY.  Otherwise, fills idesc_ref
+ * with the address of the next valid packet descriptor, and returns
+ * the maximum number of valid descriptors which can be processed.
+ * You may process fewer descriptors if desired.
+ *
+ * Call gxio_mpipe_iqueue_consume() on each packet once it has been
+ * processed (or dropped), to allow more packets to be delivered.
+ *
+ * @param iqueue An ingress queue initialized via gxio_mpipe_iqueue_init().
+ * @param idesc_ref A pointer to a packet descriptor pointer.
+ * @return The (positive) number of packets which can be processed,
+ * or ::GXIO_MPIPE_ERR_IQUEUE_EMPTY if no packets are available.
+ */
+static inline int gxio_mpipe_iqueue_try_peek(gxio_mpipe_iqueue_t *iqueue,
+					     gxio_mpipe_idesc_t **idesc_ref)
+{
+	gxio_mpipe_idesc_t *next;
+
+	uint64_t head = iqueue->head;
+	uint64_t tail = __gxio_mmio_read(iqueue->idescs);
+
+	/* Available entries. */
+	uint64_t avail =
+		(tail >= head) ? (tail - head) : (iqueue->num_entries - head);
+
+	if (avail == 0) {
+		*idesc_ref = NULL;
+		return GXIO_MPIPE_ERR_IQUEUE_EMPTY;
+	}
+
+	next = &iqueue->idescs[head];
+
+	/* ISSUE: Is this helpful? */
+	__insn_prefetch(next);
+
+#ifdef __BIG_ENDIAN__
+	/* HACK: Swap new entries directly in memory. */
+	{
+		int i, j;
+		for (i = iqueue->swapped; i < avail; i++) {
+			for (j = 0; j < 8; j++)
+				next[i].words[j] =
+					__builtin_bswap64(next[i].words[j]);
+		}
+		iqueue->swapped = avail;
+	}
+#endif
+
+	*idesc_ref = next;
+
+	return avail;
+}
+
+/* Drop a packet by pushing its buffer (if appropriate).
+ *
+ * NOTE: The caller must still call gxio_mpipe_iqueue_consume() if idesc
+ * came from gxio_mpipe_iqueue_try_peek() or gxio_mpipe_iqueue_peek().
+ *
+ * @param iqueue An ingress queue initialized via gxio_mpipe_iqueue_init().
+ * @param idesc A packet descriptor.
+ */
+static inline void gxio_mpipe_iqueue_drop(gxio_mpipe_iqueue_t *iqueue,
+					  gxio_mpipe_idesc_t *idesc)
+{
+	/* FIXME: Handle "chaining" properly. */
+
+	if (!idesc->be) {
+		unsigned char *va = gxio_mpipe_idesc_get_va(idesc);
+		gxio_mpipe_push_buffer(iqueue->context, idesc->stack_idx, va);
+	}
+}
+
+/*****************************************************************
+ *                      Egress Queue Wrapper                      *
+ ******************************************************************/
+
+/* A convenient, thread-safe interface to an eDMA ring. */
+typedef struct {
+
+	/* State object for tracking head and tail pointers. */
+	__gxio_dma_queue_t dma_queue;
+
+	/* The ring entries. */
+	gxio_mpipe_edesc_t *edescs;
+
+	/* The number of entries minus one. */
+	unsigned long mask_num_entries;
+
+	/* The log2() of the number of entries. */
+	unsigned long log2_num_entries;
+
+} gxio_mpipe_equeue_t;
+
+/* Initialize an "equeue".
+ *
+ * Takes the equeue plus the same args as gxio_mpipe_init_edma_ring().
+ */
+extern int gxio_mpipe_equeue_init(gxio_mpipe_equeue_t *equeue,
+				  gxio_mpipe_context_t *context,
+				  unsigned int edma_ring_id,
+				  unsigned int channel,
+				  void *mem, unsigned int mem_size,
+				  unsigned int mem_flags);
+
+/* Reserve completion slots for edescs.
+ *
+ * Use gxio_mpipe_equeue_put_at() to actually populate the slots.
+ *
+ * This function is slower than gxio_mpipe_equeue_reserve_fast(), but
+ * returns a full 64 bit completion slot, which can be used with
+ * gxio_mpipe_equeue_is_complete().
+ *
+ * @param equeue An egress queue initialized via gxio_mpipe_equeue_init().
+ * @param num Number of slots to reserve (must be non-zero).
+ * @return The first reserved completion slot, or a negative error code.
+ */
+static inline int64_t gxio_mpipe_equeue_reserve(gxio_mpipe_equeue_t *equeue,
+						unsigned int num)
+{
+	return __gxio_dma_queue_reserve_aux(&equeue->dma_queue, num, true);
+}
+
+/* Reserve completion slots for edescs, if possible.
+ *
+ * Use gxio_mpipe_equeue_put_at() to actually populate the slots.
+ *
+ * This function is slower than gxio_mpipe_equeue_try_reserve_fast(),
+ * but returns a full 64 bit completion slot, which can be used with
+ * gxio_mpipe_equeue_is_complete().
+ *
+ * @param equeue An egress queue initialized via gxio_mpipe_equeue_init().
+ * @param num Number of slots to reserve (must be non-zero).
+ * @return The first reserved completion slot, or a negative error code.
+ */
+static inline int64_t gxio_mpipe_equeue_try_reserve(gxio_mpipe_equeue_t
+						    *equeue, unsigned int num)
+{
+	return __gxio_dma_queue_reserve_aux(&equeue->dma_queue, num, false);
+}
+
+/* Reserve slots for edescs.
+ *
+ * Use gxio_mpipe_equeue_put_at() to actually populate the slots.
+ *
+ * This function is faster than gxio_mpipe_equeue_reserve(), but
+ * returns a 24 bit slot (instead of a 64 bit completion slot), which
+ * thus cannot be used with gxio_mpipe_equeue_is_complete().
+ *
+ * @param equeue An egress queue initialized via gxio_mpipe_equeue_init().
+ * @param num Number of slots to reserve (should be non-zero).
+ * @return The first reserved slot, or a negative error code.
+ */
+static inline int64_t gxio_mpipe_equeue_reserve_fast(gxio_mpipe_equeue_t
+						     *equeue, unsigned int num)
+{
+	return __gxio_dma_queue_reserve(&equeue->dma_queue, num, true, false);
+}
+
+/* Reserve slots for edescs, if possible.
+ *
+ * Use gxio_mpipe_equeue_put_at() to actually populate the slots.
+ *
+ * This function is faster than gxio_mpipe_equeue_try_reserve(), but
+ * returns a 24 bit slot (instead of a 64 bit completion slot), which
+ * thus cannot be used with gxio_mpipe_equeue_is_complete().
+ *
+ * @param equeue An egress queue initialized via gxio_mpipe_equeue_init().
+ * @param num Number of slots to reserve (should be non-zero).
+ * @return The first reserved slot, or a negative error code.
+ */
+static inline int64_t gxio_mpipe_equeue_try_reserve_fast(gxio_mpipe_equeue_t
+							 *equeue,
+							 unsigned int num)
+{
+	return __gxio_dma_queue_reserve(&equeue->dma_queue, num, false, false);
+}
+
+/*
+ * HACK: This helper function tricks gcc 4.6 into avoiding saving
+ * a copy of "edesc->words[0]" on the stack for no obvious reason.
+ */
+
+static inline void gxio_mpipe_equeue_put_at_aux(gxio_mpipe_equeue_t *equeue,
+						uint_reg_t ew[2],
+						unsigned long slot)
+{
+	unsigned long edma_slot = slot & equeue->mask_num_entries;
+	gxio_mpipe_edesc_t *edesc_p = &equeue->edescs[edma_slot];
+
+	/*
+	 * ISSUE: Could set eDMA ring to be on generation 1 at start, which
+	 * would avoid the negation here, perhaps allowing "__insn_bfins()".
+	 */
+	ew[0] |= !((slot >> equeue->log2_num_entries) & 1);
+
+	/*
+	 * NOTE: We use "__gxio_mpipe_write()", plus the fact that the eDMA
+	 * queue alignment restrictions ensure that these two words are on
+	 * the same cacheline, to force proper ordering between the stores.
+	 */
+	__gxio_mmio_write64(&edesc_p->words[1], ew[1]);
+	__gxio_mmio_write64(&edesc_p->words[0], ew[0]);
+}
+
+/* Post an edesc to a given slot in an equeue.
+ *
+ * This function copies the supplied edesc into entry "slot mod N" in
+ * the underlying ring, setting the "gen" bit to the appropriate value
+ * based on "(slot mod N*2)", where "N" is the size of the ring.  Note
+ * that the higher bits of slot are unused, and thus, this function
+ * can handle "slots" as well as "completion slots".
+ *
+ * Normally this function is used to fill in slots reserved by
+ * gxio_mpipe_equeue_try_reserve(), gxio_mpipe_equeue_reserve(),
+ * gxio_mpipe_equeue_try_reserve_fast(), or
+ * gxio_mpipe_equeue_reserve_fast(),
+ *
+ * This function can also be used without "reserving" slots, if the
+ * application KNOWS that the ring can never overflow, for example, by
+ * pushing fewer buffers into the buffer stacks than there are total
+ * slots in the equeue, but this is NOT recommended.
+ *
+ * @param equeue An egress queue initialized via gxio_mpipe_equeue_init().
+ * @param edesc The egress descriptor to be posted.
+ * @param slot An egress slot (only the low bits are actually used).
+ */
+static inline void gxio_mpipe_equeue_put_at(gxio_mpipe_equeue_t *equeue,
+					    gxio_mpipe_edesc_t edesc,
+					    unsigned long slot)
+{
+	gxio_mpipe_equeue_put_at_aux(equeue, edesc.words, slot);
+}
+
+/* Post an edesc to the next slot in an equeue.
+ *
+ * This is a convenience wrapper around
+ * gxio_mpipe_equeue_reserve_fast() and gxio_mpipe_equeue_put_at().
+ *
+ * @param equeue An egress queue initialized via gxio_mpipe_equeue_init().
+ * @param edesc The egress descriptor to be posted.
+ * @return 0 on success.
+ */
+static inline int gxio_mpipe_equeue_put(gxio_mpipe_equeue_t *equeue,
+					gxio_mpipe_edesc_t edesc)
+{
+	int64_t slot = gxio_mpipe_equeue_reserve_fast(equeue, 1);
+	if (slot < 0)
+		return (int)slot;
+
+	gxio_mpipe_equeue_put_at(equeue, edesc, slot);
+
+	return 0;
+}
+
+/* Ask the mPIPE hardware to egress outstanding packets immediately.
+ *
+ * This call is not necessary, but may slightly reduce overall latency.
+ *
+ * Technically, you should flush all gxio_mpipe_equeue_put_at() writes
+ * to memory before calling this function, to ensure the descriptors
+ * are visible in memory before the mPIPE hardware actually looks for
+ * them.  But this should be very rare, and the only side effect would
+ * be increased latency, so it is up to the caller to decide whether
+ * or not to flush memory.
+ *
+ * @param equeue An egress queue initialized via gxio_mpipe_equeue_init().
+ */
+static inline void gxio_mpipe_equeue_flush(gxio_mpipe_equeue_t *equeue)
+{
+	/* Use "ring_idx = 0" and "count = 0" to "wake up" the eDMA ring. */
+	MPIPE_EDMA_POST_REGION_VAL_t val = { {0} };
+	/* Flush the write buffers. */
+	__insn_flushwb();
+	__gxio_mmio_write(equeue->dma_queue.post_region_addr, val.word);
+}
+
+/* Determine if a given edesc has been completed.
+ *
+ * Note that this function requires a "completion slot", and thus may
+ * NOT be used with a "slot" from gxio_mpipe_equeue_reserve_fast() or
+ * gxio_mpipe_equeue_try_reserve_fast().
+ *
+ * @param equeue An egress queue initialized via gxio_mpipe_equeue_init().
+ * @param completion_slot The completion slot used by the edesc.
+ * @param update If true, and the desc does not appear to have completed
+ * yet, then update any software cache of the hardware completion counter,
+ * and check again.  This should normally be true.
+ * @return True iff the given edesc has been completed.
+ */
+static inline int gxio_mpipe_equeue_is_complete(gxio_mpipe_equeue_t *equeue,
+						int64_t completion_slot,
+						int update)
+{
+	return __gxio_dma_queue_is_complete(&equeue->dma_queue,
+					    completion_slot, update);
+}
+
+/*****************************************************************
+ *                        Link Management                         *
+ ******************************************************************/
+
+/*
+ *
+ * Functions for manipulating and sensing the state and configuration
+ * of physical network links.
+ *
+ * @section gxio_mpipe_link_perm Link Permissions
+ *
+ * Opening a link (with gxio_mpipe_link_open()) requests a set of link
+ * permissions, which control what may be done with the link, and potentially
+ * what permissions may be granted to other processes.
+ *
+ * Data permission allows the process to receive packets from the link by
+ * specifying the link's channel number in mPIPE packet distribution rules,
+ * and to send packets to the link by using the link's channel number as
+ * the target for an eDMA ring.
+ *
+ * Stats permission allows the process to retrieve link attributes (such as
+ * the speeds it is capable of running at, or whether it is currently up), and
+ * to read and write certain statistics-related registers in the link's MAC.
+ *
+ * Control permission allows the process to retrieve and modify link attributes
+ * (so that it may, for example, bring the link up and take it down), and
+ * read and write many registers in the link's MAC and PHY.
+ *
+ * Any permission may be requested as shared, which allows other processes
+ * to also request shared permission, or exclusive, which prevents other
+ * processes from requesting it.  In keeping with GXIO's typical usage in
+ * an embedded environment, the defaults for all permissions are shared.
+ *
+ * Permissions are granted on a first-come, first-served basis, so if two
+ * applications request an exclusive permission on the same link, the one
+ * to run first will win.  Note, however, that some system components, like
+ * the kernel Ethernet driver, may get an opportunity to open links before
+ * any applications run.
+ *
+ * @section gxio_mpipe_link_names Link Names
+ *
+ * Link names are of the form gbe<em>number</em> (for Gigabit Ethernet),
+ * xgbe<em>number</em> (for 10 Gigabit Ethernet), loop<em>number</em> (for
+ * internal mPIPE loopback), or ilk<em>number</em>/<em>channel</em>
+ * (for Interlaken links); for instance, gbe0, xgbe1, loop3, and
+ * ilk0/12 are all possible link names.  The correspondence between
+ * the link name and an mPIPE instance number or mPIPE channel number is
+ * system-dependent; all links will not exist on all systems, and the set
+ * of numbers used for a particular link type may not start at zero and may
+ * not be contiguous.  Use gxio_mpipe_link_enumerate() to retrieve the set of
+ * links which exist on a system, and always use gxio_mpipe_link_instance()
+ * to determine which mPIPE controls a particular link.
+ *
+ * Note that in some cases, links may share hardware, such as PHYs, or
+ * internal mPIPE buffers; in these cases, only one of the links may be
+ * opened at a time.  This is especially common with xgbe and gbe ports,
+ * since each xgbe port uses 4 SERDES lanes, each of which may also be
+ * configured as one gbe port.
+ *
+ * @section gxio_mpipe_link_states Link States
+ *
+ * The mPIPE link management model revolves around three different states,
+ * which are maintained for each link:
+ *
+ * 1. The <em>current</em> link state: is the link up now, and if so, at
+ *    what speed?
+ *
+ * 2. The <em>desired</em> link state: what do we want the link state to be?
+ *    The system is always working to make this state the current state;
+ *    thus, if the desired state is up, and the link is down, we'll be
+ *    constantly trying to bring it up, automatically.
+ *
+ * 3. The <em>possible</em> link state: what speeds are valid for this
+ *    particular link?  Or, in other words, what are the capabilities of
+ *    the link hardware?
+ *
+ * These link states are not, strictly speaking, related to application
+ * state; they may be manipulated at any time, whether or not the link
+ * is currently being used for data transfer.  However, for convenience,
+ * gxio_mpipe_link_open() and gxio_mpipe_link_close() (or application exit)
+ * can affect the link state.  These implicit link management operations
+ * may be modified or disabled by the use of link open flags.
+ *
+ * From an application, you can use gxio_mpipe_link_get_attr()
+ * and gxio_mpipe_link_set_attr() to manipulate the link states.
+ * gxio_mpipe_link_get_attr() with ::GXIO_MPIPE_LINK_POSSIBLE_STATE
+ * gets you the possible link state.  gxio_mpipe_link_get_attr() with
+ * ::GXIO_MPIPE_LINK_CURRENT_STATE gets you the current link state.
+ * Finally, gxio_mpipe_link_set_attr() and gxio_mpipe_link_get_attr()
+ * with ::GXIO_MPIPE_LINK_DESIRED_STATE allow you to modify or retrieve
+ * the desired link state.
+ *
+ * If you want to manage a link from a part of your application which isn't
+ * involved in packet processing, you can use the ::GXIO_MPIPE_LINK_NO_DATA
+ * flags on a gxio_mpipe_link_open() call.  This opens the link, but does
+ * not request data permission, so it does not conflict with any exclusive
+ * permissions which may be held by other processes.  You can then can use
+ * gxio_mpipe_link_get_attr() and gxio_mpipe_link_set_attr() on this link
+ * object to bring up or take down the link.
+ *
+ * Some links support link state bits which support various loopback
+ * modes. ::GXIO_MPIPE_LINK_LOOP_MAC tests datapaths within the Tile
+ * Processor itself; ::GXIO_MPIPE_LINK_LOOP_PHY tests the datapath between
+ * the Tile Processor and the external physical layer interface chip; and
+ * ::GXIO_MPIPE_LINK_LOOP_EXT tests the entire network datapath with the
+ * aid of an external loopback connector.  In addition to enabling hardware
+ * testing, such configuration can be useful for software testing, as well.
+ *
+ * When LOOP_MAC or LOOP_PHY is enabled, packets transmitted on a channel
+ * will be received by that channel, instead of being emitted on the
+ * physical link, and packets received on the physical link will be ignored.
+ * Other than that, all standard GXIO operations work as you might expect.
+ * Note that loopback operation requires that the link be brought up using
+ * one or more of the GXIO_MPIPE_LINK_SPEED_xxx link state bits.
+ *
+ * Those familiar with previous versions of the MDE on TILEPro hardware
+ * will notice significant similarities between the NetIO link management
+ * model and the mPIPE link management model.  However, the NetIO model
+ * was developed in stages, and some of its features -- for instance,
+ * the default setting of certain flags -- were shaped by the need to be
+ * compatible with previous versions of NetIO.  Since the features provided
+ * by the mPIPE hardware and the mPIPE GXIO library are significantly
+ * different than those provided by NetIO, in some cases, we have made
+ * different choices in the mPIPE link management API.  Thus, please read
+ * this documentation carefully before assuming that mPIPE link management
+ * operations are exactly equivalent to their NetIO counterparts.
+ */
+
+/* An object used to manage mPIPE link state and resources. */
+typedef struct {
+	/* The overall mPIPE context. */
+	gxio_mpipe_context_t *context;
+
+	/* The channel number used by this link. */
+	uint8_t channel;
+
+	/* The MAC index used by this link. */
+	uint8_t mac;
+} gxio_mpipe_link_t;
+
+/* Retrieve one of this system's legal link names, and its MAC address.
+ *
+ * @param index Link name index.  If a system supports N legal link names,
+ *  then indices between 0 and N - 1, inclusive, each correspond to one of
+ *  those names.  Thus, to retrieve all of a system's legal link names,
+ *  call this function in a loop, starting with an index of zero, and
+ *  incrementing it once per iteration until -1 is returned.
+ * @param link_name Pointer to the buffer which will receive the retrieved
+ *  link name.  The buffer should contain space for at least
+ *  ::GXIO_MPIPE_LINK_NAME_LEN bytes; the returned name, including the
+ *  terminating null byte, will be no longer than that.
+ * @param link_name Pointer to the buffer which will receive the retrieved
+ *  MAC address.  The buffer should contain space for at least 6 bytes.
+ * @return Zero if a link name was successfully retrieved; -1 if one was
+ *  not.
+ */
+extern int gxio_mpipe_link_enumerate_mac(int index, char *link_name,
+					 uint8_t *mac_addr);
+
+/* Open an mPIPE link.
+ *
+ *  A link must be opened before it may be used to send or receive packets,
+ *  and before its state may be examined or changed.  Depending up on the
+ *  link's intended use, one or more link permissions may be requested via
+ *  the flags parameter; see @ref gxio_mpipe_link_perm.  In addition, flags
+ *  may request that the link's state be modified at open time.  See @ref
+ *  gxio_mpipe_link_states and @ref gxio_mpipe_link_open_flags for more detail.
+ *
+ * @param link A link state object, which will be initialized if this
+ *  function completes successfully.
+ * @param context An initialized mPIPE context.
+ * @param link_name Name of the link.
+ * @param flags Zero or more @ref gxio_mpipe_link_open_flags, ORed together.
+ * @return 0 if the link was successfully opened, or a negative error code.
+ *
+ */
+extern int gxio_mpipe_link_open(gxio_mpipe_link_t *link,
+				gxio_mpipe_context_t *context,
+				const char *link_name, unsigned int flags);
+
+/* Close an mPIPE link.
+ *
+ *  Closing a link makes it available for use by other processes.  Once
+ *  a link has been closed, packets may no longer be sent on or received
+ *  from the link, and its state may not be examined or changed.
+ *
+ * @param link A link state object, which will no longer be initialized
+ *  if this function completes successfully.
+ * @return 0 if the link was successfully closed, or a negative error code.
+ *
+ */
+extern int gxio_mpipe_link_close(gxio_mpipe_link_t *link);
+
+/* Return a link's channel number.
+ *
+ * @param link A properly initialized link state object.
+ * @return The channel number for the link.
+ */
+static inline int gxio_mpipe_link_channel(gxio_mpipe_link_t *link)
+{
+	return link->channel;
+}
+
+///////////////////////////////////////////////////////////////////
+//                             Timestamp                         //
+///////////////////////////////////////////////////////////////////
+
+/* Get the timestamp of mPIPE when this routine is called.
+ *
+ * @param context An initialized mPIPE context.
+ * @param ts A timespec structure to store the current clock.
+ * @return If the call was successful, zero; otherwise, a negative error
+ *  code.
+ */
+extern int gxio_mpipe_get_timestamp(gxio_mpipe_context_t *context,
+				    struct timespec *ts);
+
+/* Set the timestamp of mPIPE.
+ *
+ * @param context An initialized mPIPE context.
+ * @param ts A timespec structure to store the requested clock.
+ * @return If the call was successful, zero; otherwise, a negative error
+ *  code.
+ */
+extern int gxio_mpipe_set_timestamp(gxio_mpipe_context_t *context,
+				    const struct timespec *ts);
+
+/* Adjust the timestamp of mPIPE.
+ *
+ * @param context An initialized mPIPE context.
+ * @param delta A signed time offset to adjust, in nanoseconds.
+ * The absolute value of this parameter must be less than or
+ * equal to 1000000000.
+ * @return If the call was successful, zero; otherwise, a negative error
+ *  code.
+ */
+extern int gxio_mpipe_adjust_timestamp(gxio_mpipe_context_t *context,
+				       int64_t delta);
+
+#endif /* !_GXIO_MPIPE_H_ */

arch/tile/include/gxio/trio.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/*
+ *
+ * An API for allocating, configuring, and manipulating TRIO hardware
+ * resources
+ */
+
+/*
+ *
+ * The TILE-Gx TRIO shim provides connections to external devices via
+ * PCIe or other transaction IO standards.  The gxio_trio_ API,
+ * declared in <gxio/trio.h>, allows applications to allocate and
+ * configure TRIO IO resources like DMA command rings, memory map
+ * windows, and device interrupts.  The following sections introduce
+ * the various components of the API.  We strongly recommend reading
+ * the TRIO section of the IO Device Guide (UG404) before working with
+ * this API.
+ *
+ * @section trio__ingress TRIO Ingress Hardware Resources
+ *
+ * The TRIO ingress hardware is responsible for examining incoming
+ * PCIe or StreamIO packets and choosing a processing mechanism based
+ * on the packets' bus address.  The gxio_trio_ API can be used to
+ * configure different handlers for different ranges of bus address
+ * space.  The user can configure "mapped memory" and "scatter queue"
+ * regions to match incoming packets within 4kB-aligned ranges of bus
+ * addresses.  Each range specifies a different set of mapping
+ * parameters to be applied when handling the ingress packet.  The
+ * following sections describe how to work with MapMem and scatter
+ * queue regions.
+ *
+ * @subsection trio__mapmem TRIO MapMem Regions
+ *
+ * TRIO mapped memory (or MapMem) regions allow the user to map
+ * incoming read and write requests directly to the application's
+ * memory space.  MapMem regions are allocated via
+ * gxio_trio_alloc_memory_maps().  Given an integer MapMem number,
+ * applications can use gxio_trio_init_memory_map() to specify the
+ * range of bus addresses that will match the region and the range of
+ * virtual addresses to which those packets will be applied.
+ *
+ * As with many other gxio APIs, the programmer must be sure to
+ * register memory pages that will be used with MapMem regions.  Pages
+ * can be registered with TRIO by allocating an ASID (address space
+ * identifier) and then using gxio_trio_register_page() to register up to
+ * 16 pages with the hardware.  The initialization functions for
+ * resources that require registered memory (MapMem, scatter queues,
+ * push DMA, and pull DMA) then take an 'asid' parameter in order to
+ * configure which set of registered pages is used by each resource.
+ *
+ * @subsection trio__scatter_queue TRIO Scatter Queues
+ *
+ * The TRIO shim's scatter queue regions allow users to dynamically
+ * map buffers from a large address space into a small range of bus
+ * addresses.  This is particularly helpful for PCIe endpoint devices,
+ * where the host generally limits the size of BARs to tens of
+ * megabytes.
+ *
+ * Each scatter queue consists of a memory map region, a queue of
+ * tile-side buffer VAs to be mapped to that region, and a bus-mapped
+ * "doorbell" register that the remote endpoint can write to trigger a
+ * dequeue of the current buffer VA, thus swapping in a new buffer.
+ * The VAs pushed onto a scatter queue must be 4kB aligned, so
+ * applications may need to use higher-level protocols to inform
+ * remote entities that they should apply some additional, sub-4kB
+ * offset when reading or writing the scatter queue region.  For more
+ * information, see the IO Device Guide (UG404).
+ *
+ * @section trio__egress TRIO Egress Hardware Resources
+ *
+ * The TRIO shim supports two mechanisms for egress packet generation:
+ * programmed IO (PIO) and push/pull DMA.  PIO allows applications to
+ * create MMIO mappings for PCIe or StreamIO address space, such that
+ * the application can generate word-sized read or write transactions
+ * by issuing load or store instructions.  Push and pull DMA are tuned
+ * for larger transactions; they use specialized hardware engines to
+ * transfer large blocks of data at line rate.
+ *
+ * @subsection trio__pio TRIO Programmed IO
+ *
+ * Programmed IO allows applications to create MMIO mappings for PCIe
+ * or StreamIO address space.  The hardware PIO regions support access
+ * to PCIe configuration, IO, and memory space, but the gxio_trio API
+ * only supports memory space accesses.  PIO regions are allocated
+ * with gxio_trio_alloc_pio_regions() and initialized via
+ * gxio_trio_init_pio_region().  Once a region is bound to a range of
+ * bus address via the initialization function, the application can
+ * use gxio_trio_map_pio_region() to create MMIO mappings from its VA
+ * space onto the range of bus addresses supported by the PIO region.
+ *
+ * @subsection trio_dma TRIO Push and Pull DMA
+ *
+ * The TRIO push and pull DMA engines allow users to copy blocks of
+ * data between application memory and the bus.  Push DMA generates
+ * write packets that copy from application memory to the bus and pull
+ * DMA generates read packets that copy from the bus into application
+ * memory.  The DMA engines are managed via an API that is very
+ * similar to the mPIPE eDMA interface.  For a detailed explanation of
+ * the eDMA queue API, see @ref gxio_mpipe_wrappers.
+ *
+ * Push and pull DMA queues are allocated via
+ * gxio_trio_alloc_push_dma_ring() / gxio_trio_alloc_pull_dma_ring().
+ * Once allocated, users generally use a ::gxio_trio_dma_queue_t
+ * object to manage the queue, providing easy wrappers for reserving
+ * command slots in the DMA command ring, filling those slots, and
+ * waiting for commands to complete.  DMA queues can be initialized
+ * via gxio_trio_init_push_dma_queue() or
+ * gxio_trio_init_pull_dma_queue().
+ *
+ * See @ref trio/push_dma/app.c for an example of how to use push DMA.
+ *
+ * @section trio_shortcomings Plans for Future API Revisions
+ *
+ * The simulation framework is incomplete.  Future features include:
+ *
+ * - Support for reset and deallocation of resources.
+ *
+ * - Support for pull DMA.
+ *
+ * - Support for interrupt regions and user-space interrupt delivery.
+ *
+ * - Support for getting BAR mappings and reserving regions of BAR
+ *   address space.
+ */
+#ifndef _GXIO_TRIO_H_
+#define _GXIO_TRIO_H_
+
+#include <linux/types.h>
+
+#include "common.h"
+#include "dma_queue.h"
+
+#include <arch/trio_constants.h>
+#include <arch/trio.h>
+#include <arch/trio_pcie_intfc.h>
+#include <arch/trio_pcie_rc.h>
+#include <arch/trio_shm.h>
+#include <hv/drv_trio_intf.h>
+#include <hv/iorpc.h>
+
+/* A context object used to manage TRIO hardware resources. */
+typedef struct {
+
+	/* File descriptor for calling up to Linux (and thus the HV). */
+	int fd;
+
+	/* The VA at which the MAC MMIO registers are mapped. */
+	char *mmio_base_mac;
+
+	/* The VA at which the PIO config space are mapped for each PCIe MAC.
+	   Gx36 has max 3 PCIe MACs per TRIO shim. */
+	char *mmio_base_pio_cfg[TILEGX_TRIO_PCIES];
+
+#ifdef USE_SHARED_PCIE_CONFIG_REGION
+	/* Index of the shared PIO region for PCI config access. */
+	int pio_cfg_index;
+#else
+	/* Index of the PIO region for PCI config access per MAC. */
+	int pio_cfg_index[TILEGX_TRIO_PCIES];
+#endif
+
+	/*  The VA at which the push DMA MMIO registers are mapped. */
+	char *mmio_push_dma[TRIO_NUM_PUSH_DMA_RINGS];
+
+	/*  The VA at which the pull DMA MMIO registers are mapped. */
+	char *mmio_pull_dma[TRIO_NUM_PUSH_DMA_RINGS];
+
+	/* Application space ID. */
+	unsigned int asid;
+
+} gxio_trio_context_t;
+
+/* Command descriptor for push or pull DMA. */
+typedef TRIO_DMA_DESC_t gxio_trio_dma_desc_t;
+
+/* A convenient, thread-safe interface to an eDMA ring. */
+typedef struct {
+
+	/* State object for tracking head and tail pointers. */
+	__gxio_dma_queue_t dma_queue;
+
+	/* The ring entries. */
+	gxio_trio_dma_desc_t *dma_descs;
+
+	/* The number of entries minus one. */
+	unsigned long mask_num_entries;
+
+	/* The log2() of the number of entries. */
+	unsigned int log2_num_entries;
+
+} gxio_trio_dma_queue_t;
+
+/* Initialize a TRIO context.
+ *
+ * This function allocates a TRIO "service domain" and maps the MMIO
+ * registers into the the caller's VA space.
+ *
+ * @param trio_index Which TRIO shim; Gx36 must pass 0.
+ * @param context Context object to be initialized.
+ */
+extern int gxio_trio_init(gxio_trio_context_t *context,
+			  unsigned int trio_index);
+
+/* This indicates that an ASID hasn't been allocated. */
+#define GXIO_ASID_NULL -1
+
+/* Ordering modes for map memory regions and scatter queue regions. */
+typedef enum gxio_trio_order_mode_e {
+	/* Writes are not ordered.  Reads always wait for previous writes. */
+	GXIO_TRIO_ORDER_MODE_UNORDERED =
+		TRIO_MAP_MEM_SETUP__ORDER_MODE_VAL_UNORDERED,
+	/* Both writes and reads wait for previous transactions to complete. */
+	GXIO_TRIO_ORDER_MODE_STRICT =
+		TRIO_MAP_MEM_SETUP__ORDER_MODE_VAL_STRICT,
+	/* Writes are ordered unless the incoming packet has the
+	   relaxed-ordering attributes set. */
+	GXIO_TRIO_ORDER_MODE_OBEY_PACKET =
+		TRIO_MAP_MEM_SETUP__ORDER_MODE_VAL_REL_ORD
+} gxio_trio_order_mode_t;
+
+/* Initialize a memory mapping region.
+ *
+ * @param context An initialized TRIO context.
+ * @param map A Memory map region allocated by gxio_trio_alloc_memory_map().
+ * @param target_mem VA of backing memory, should be registered via
+ *   gxio_trio_register_page() and aligned to 4kB.
+ * @param target_size Length of the memory mapping, must be a multiple
+ * of 4kB.
+ * @param asid ASID to be used for Tile-side address translation.
+ * @param mac MAC number.
+ * @param bus_address Bus address at which the mapping starts.
+ * @param order_mode Memory ordering mode for this mapping.
+ * @return Zero on success, else ::GXIO_TRIO_ERR_BAD_MEMORY_MAP,
+ * GXIO_TRIO_ERR_BAD_ASID, or ::GXIO_TRIO_ERR_BAD_BUS_RANGE.
+ */
+extern int gxio_trio_init_memory_map(gxio_trio_context_t *context,
+				     unsigned int map, void *target_mem,
+				     size_t target_size, unsigned int asid,
+				     unsigned int mac, uint64_t bus_address,
+				     gxio_trio_order_mode_t order_mode);
+
+/* Flags that can be passed to resource allocation functions. */
+enum gxio_trio_alloc_flags_e {
+	GXIO_TRIO_ALLOC_FIXED = HV_TRIO_ALLOC_FIXED,
+};
+
+/* Flags that can be passed to memory registration functions. */
+enum gxio_trio_mem_flags_e {
+	/* Do not fill L3 when writing, and invalidate lines upon egress. */
+	GXIO_TRIO_MEM_FLAG_NT_HINT = IORPC_MEM_BUFFER_FLAG_NT_HINT,
+
+	/* L3 cache fills should only populate IO cache ways. */
+	GXIO_TRIO_MEM_FLAG_IO_PIN = IORPC_MEM_BUFFER_FLAG_IO_PIN,
+};
+
+/* Flag indicating a request generator uses a special traffic
+    class. */
+#define GXIO_TRIO_FLAG_TRAFFIC_CLASS(N) HV_TRIO_FLAG_TC(N)
+
+/* Flag indicating a request generator uses a virtual function
+    number. */
+#define GXIO_TRIO_FLAG_VFUNC(N) HV_TRIO_FLAG_VFUNC(N)
+
+/*****************************************************************
+ *                       Memory Registration                      *
+ ******************************************************************/
+
+/* Allocate Application Space Identifiers (ASIDs).  Each ASID can
+ * register up to 16 page translations.  ASIDs are used by memory map
+ * regions, scatter queues, and DMA queues to translate application
+ * VAs into memory system PAs.
+ *
+ * @param context An initialized TRIO context.
+ * @param count Number of ASIDs required.
+ * @param first Index of first ASID if ::GXIO_TRIO_ALLOC_FIXED flag
+ *   is set, otherwise ignored.
+ * @param flags Flag bits, including bits from ::gxio_trio_alloc_flags_e.
+ * @return Index of first ASID, or ::GXIO_TRIO_ERR_NO_ASID if allocation
+ *   failed.
+ */
+extern int gxio_trio_alloc_asids(gxio_trio_context_t *context,
+				 unsigned int count, unsigned int first,
+				 unsigned int flags);
+
+#endif /* ! _GXIO_TRIO_H_ */

arch/tile/include/gxio/usb_host.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+#ifndef _GXIO_USB_H_
+#define _GXIO_USB_H_
+
+#include "common.h"
+
+#include <hv/drv_usb_host_intf.h>
+#include <hv/iorpc.h>
+
+/*
+ *
+ * An API for manipulating general-purpose I/O pins.
+ */
+
+/*
+ *
+ * The USB shim allows access to the processor's Universal Serial Bus
+ * connections.
+ */
+
+/* A context object used to manage USB hardware resources. */
+typedef struct {
+
+	/* File descriptor for calling up to the hypervisor. */
+	int fd;
+
+	/* The VA at which our MMIO registers are mapped. */
+	char *mmio_base;
+} gxio_usb_host_context_t;
+
+/* Initialize a USB context.
+ *
+ *  A properly initialized context must be obtained before any of the other
+ *  gxio_usb_host routines may be used.
+ *
+ * @param context Pointer to a gxio_usb_host_context_t, which will be
+ *  initialized by this routine, if it succeeds.
+ * @param usb_index Index of the USB shim to use.
+ * @param is_ehci Nonzero to use the EHCI interface; zero to use the OHCI
+ *  intereface.
+ * @return Zero if the context was successfully initialized, else a
+ *  GXIO_ERR_xxx error code.
+ */
+extern int gxio_usb_host_init(gxio_usb_host_context_t * context, int usb_index,
+			      int is_ehci);
+
+/* Destroy a USB context.
+ *
+ *  Once destroyed, a context may not be used with any gxio_usb_host routines
+ *  other than gxio_usb_host_init().  After this routine returns, no further
+ *  interrupts or signals requested on this context will be delivered.  The
+ *  state and configuration of the pins which had been attached to this
+ *  context are unchanged by this operation.
+ *
+ * @param context Pointer to a gxio_usb_host_context_t.
+ * @return Zero if the context was successfully destroyed, else a
+ *  GXIO_ERR_xxx error code.
+ */
+extern int gxio_usb_host_destroy(gxio_usb_host_context_t * context);
+
+/* Retrieve the address of the shim's MMIO registers.
+ *
+ * @param context Pointer to a properly initialized gxio_usb_host_context_t.
+ * @return The address of the shim's MMIO registers.
+ */
+extern void *gxio_usb_host_get_reg_start(gxio_usb_host_context_t * context);
+
+/* Retrieve the length of the shim's MMIO registers.
+ *
+ * @param context Pointer to a properly initialized gxio_usb_host_context_t.
+ * @return The length of the shim's MMIO registers.
+ */
+extern size_t gxio_usb_host_get_reg_len(gxio_usb_host_context_t * context);
+
+#endif /* _GXIO_USB_H_ */

arch/tile/include/hv/drv_mpipe_intf.h

···
+/*
+ * Copyright 2011 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/**
+ * Interface definitions for the mpipe driver.
+ */
+
+#ifndef _SYS_HV_DRV_MPIPE_INTF_H
+#define _SYS_HV_DRV_MPIPE_INTF_H
+
+#include <arch/mpipe.h>
+#include <arch/mpipe_constants.h>
+
+
+/** Number of buffer stacks (32). */
+#define HV_MPIPE_NUM_BUFFER_STACKS \
+  (MPIPE_MMIO_INIT_DAT_GX36_1__BUFFER_STACK_MASK_WIDTH)
+
+/** Number of NotifRings (256). */
+#define HV_MPIPE_NUM_NOTIF_RINGS (MPIPE_NUM_NOTIF_RINGS)
+
+/** Number of NotifGroups (32). */
+#define HV_MPIPE_NUM_NOTIF_GROUPS (MPIPE_NUM_NOTIF_GROUPS)
+
+/** Number of buckets (4160). */
+#define HV_MPIPE_NUM_BUCKETS (MPIPE_NUM_BUCKETS)
+
+/** Number of "lo" buckets (4096). */
+#define HV_MPIPE_NUM_LO_BUCKETS 4096
+
+/** Number of "hi" buckets (64). */
+#define HV_MPIPE_NUM_HI_BUCKETS \
+  (HV_MPIPE_NUM_BUCKETS - HV_MPIPE_NUM_LO_BUCKETS)
+
+/** Number of edma rings (24). */
+#define HV_MPIPE_NUM_EDMA_RINGS \
+  (MPIPE_MMIO_INIT_DAT_GX36_1__EDMA_POST_MASK_WIDTH)
+
+
+
+
+/** A flag bit indicating a fixed resource allocation. */
+#define HV_MPIPE_ALLOC_FIXED 0x01
+
+/** Offset for the config register MMIO region. */
+#define HV_MPIPE_CONFIG_MMIO_OFFSET \
+  (MPIPE_MMIO_ADDR__REGION_VAL_CFG << MPIPE_MMIO_ADDR__REGION_SHIFT)
+
+/** Size of the config register MMIO region. */
+#define HV_MPIPE_CONFIG_MMIO_SIZE (64 * 1024)
+
+/** Offset for the config register MMIO region. */
+#define HV_MPIPE_FAST_MMIO_OFFSET \
+  (MPIPE_MMIO_ADDR__REGION_VAL_IDMA << MPIPE_MMIO_ADDR__REGION_SHIFT)
+
+/** Size of the fast register MMIO region (IDMA, EDMA, buffer stack). */
+#define HV_MPIPE_FAST_MMIO_SIZE \
+  ((MPIPE_MMIO_ADDR__REGION_VAL_BSM + 1 - MPIPE_MMIO_ADDR__REGION_VAL_IDMA) \
+   << MPIPE_MMIO_ADDR__REGION_SHIFT)
+
+
+/*
+ * Each type of resource allocation comes in quantized chunks, where
+ * XXX_BITS is the number of chunks, and XXX_RES_PER_BIT is the number
+ * of resources in each chunk.
+ */
+
+/** Number of buffer stack chunks available (32). */
+#define HV_MPIPE_ALLOC_BUFFER_STACKS_BITS \
+  MPIPE_MMIO_INIT_DAT_GX36_1__BUFFER_STACK_MASK_WIDTH
+
+/** Granularity of buffer stack allocation (1). */
+#define HV_MPIPE_ALLOC_BUFFER_STACKS_RES_PER_BIT \
+  (HV_MPIPE_NUM_BUFFER_STACKS / HV_MPIPE_ALLOC_BUFFER_STACKS_BITS)
+
+/** Number of NotifRing chunks available (32). */
+#define HV_MPIPE_ALLOC_NOTIF_RINGS_BITS \
+  MPIPE_MMIO_INIT_DAT_GX36_0__NOTIF_RING_MASK_WIDTH
+
+/** Granularity of NotifRing allocation (8). */
+#define HV_MPIPE_ALLOC_NOTIF_RINGS_RES_PER_BIT \
+  (HV_MPIPE_NUM_NOTIF_RINGS / HV_MPIPE_ALLOC_NOTIF_RINGS_BITS)
+
+/** Number of NotifGroup chunks available (32). */
+#define HV_MPIPE_ALLOC_NOTIF_GROUPS_BITS \
+  HV_MPIPE_NUM_NOTIF_GROUPS
+
+/** Granularity of NotifGroup allocation (1). */
+#define HV_MPIPE_ALLOC_NOTIF_GROUPS_RES_PER_BIT \
+  (HV_MPIPE_NUM_NOTIF_GROUPS / HV_MPIPE_ALLOC_NOTIF_GROUPS_BITS)
+
+/** Number of lo bucket chunks available (16). */
+#define HV_MPIPE_ALLOC_LO_BUCKETS_BITS \
+  MPIPE_MMIO_INIT_DAT_GX36_0__BUCKET_RELEASE_MASK_LO_WIDTH
+
+/** Granularity of lo bucket allocation (256). */
+#define HV_MPIPE_ALLOC_LO_BUCKETS_RES_PER_BIT \
+  (HV_MPIPE_NUM_LO_BUCKETS / HV_MPIPE_ALLOC_LO_BUCKETS_BITS)
+
+/** Number of hi bucket chunks available (16). */
+#define HV_MPIPE_ALLOC_HI_BUCKETS_BITS \
+  MPIPE_MMIO_INIT_DAT_GX36_0__BUCKET_RELEASE_MASK_HI_WIDTH
+
+/** Granularity of hi bucket allocation (4). */
+#define HV_MPIPE_ALLOC_HI_BUCKETS_RES_PER_BIT \
+  (HV_MPIPE_NUM_HI_BUCKETS / HV_MPIPE_ALLOC_HI_BUCKETS_BITS)
+
+/** Number of eDMA ring chunks available (24). */
+#define HV_MPIPE_ALLOC_EDMA_RINGS_BITS \
+  MPIPE_MMIO_INIT_DAT_GX36_1__EDMA_POST_MASK_WIDTH
+
+/** Granularity of eDMA ring allocation (1). */
+#define HV_MPIPE_ALLOC_EDMA_RINGS_RES_PER_BIT \
+  (HV_MPIPE_NUM_EDMA_RINGS / HV_MPIPE_ALLOC_EDMA_RINGS_BITS)
+
+
+
+
+/** Bit vector encoding which NotifRings are in a NotifGroup. */
+typedef struct
+{
+  /** The actual bits. */
+  uint64_t ring_mask[4];
+
+} gxio_mpipe_notif_group_bits_t;
+
+
+/** Another name for MPIPE_LBL_INIT_DAT_BSTS_TBL_t. */
+typedef MPIPE_LBL_INIT_DAT_BSTS_TBL_t gxio_mpipe_bucket_info_t;
+
+
+
+/** Eight buffer stack ids. */
+typedef struct
+{
+  /** The stacks. */
+  uint8_t stacks[8];
+
+} gxio_mpipe_rules_stacks_t;
+
+
+/** A destination mac address. */
+typedef struct
+{
+  /** The octets. */
+  uint8_t octets[6];
+
+} gxio_mpipe_rules_dmac_t;
+
+
+/** A vlan. */
+typedef uint16_t gxio_mpipe_rules_vlan_t;
+
+
+
+/** Maximum number of characters in a link name. */
+#define GXIO_MPIPE_LINK_NAME_LEN  32
+
+
+/** Structure holding a link name.  Only needed, and only typedef'ed,
+ *  because the IORPC stub generator only handles types which are single
+ *  words coming before the parameter name. */
+typedef struct
+{
+  /** The name itself. */
+  char name[GXIO_MPIPE_LINK_NAME_LEN];
+}
+_gxio_mpipe_link_name_t;
+
+/** Maximum number of characters in a symbol name. */
+#define GXIO_MPIPE_SYMBOL_NAME_LEN  128
+
+
+/** Structure holding a symbol name.  Only needed, and only typedef'ed,
+ *  because the IORPC stub generator only handles types which are single
+ *  words coming before the parameter name. */
+typedef struct
+{
+  /** The name itself. */
+  char name[GXIO_MPIPE_SYMBOL_NAME_LEN];
+}
+_gxio_mpipe_symbol_name_t;
+
+
+/** Structure holding a MAC address. */
+typedef struct
+{
+  /** The address. */
+  uint8_t mac[6];
+}
+_gxio_mpipe_link_mac_t;
+
+
+
+/** Request shared data permission -- that is, the ability to send and
+ *  receive packets -- on the specified link.  Other processes may also
+ *  request shared data permission on the same link.
+ *
+ *  No more than one of ::GXIO_MPIPE_LINK_DATA, ::GXIO_MPIPE_LINK_NO_DATA,
+ *  or ::GXIO_MPIPE_LINK_EXCL_DATA may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_DATA is assumed.
+ */
+#define GXIO_MPIPE_LINK_DATA               0x00000001UL
+
+/** Do not request data permission on the specified link.
+ *
+ *  No more than one of ::GXIO_MPIPE_LINK_DATA, ::GXIO_MPIPE_LINK_NO_DATA,
+ *  or ::GXIO_MPIPE_LINK_EXCL_DATA may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_DATA is assumed.
+ */
+#define GXIO_MPIPE_LINK_NO_DATA            0x00000002UL
+
+/** Request exclusive data permission -- that is, the ability to send and
+ *  receive packets -- on the specified link.  No other processes may
+ *  request data permission on this link, and if any process already has
+ *  data permission on it, this open will fail.
+ *
+ *  No more than one of ::GXIO_MPIPE_LINK_DATA, ::GXIO_MPIPE_LINK_NO_DATA,
+ *  or ::GXIO_MPIPE_LINK_EXCL_DATA may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_DATA is assumed.
+ */
+#define GXIO_MPIPE_LINK_EXCL_DATA          0x00000004UL
+
+/** Request shared stats permission -- that is, the ability to read and write
+ *  registers which contain link statistics, and to get link attributes --
+ *  on the specified link.  Other processes may also request shared stats
+ *  permission on the same link.
+ *
+ *  No more than one of ::GXIO_MPIPE_LINK_STATS, ::GXIO_MPIPE_LINK_NO_STATS,
+ *  or ::GXIO_MPIPE_LINK_EXCL_STATS may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_STATS is assumed.
+ */
+#define GXIO_MPIPE_LINK_STATS              0x00000008UL
+
+/** Do not request stats permission on the specified link.
+ *
+ *  No more than one of ::GXIO_MPIPE_LINK_STATS, ::GXIO_MPIPE_LINK_NO_STATS,
+ *  or ::GXIO_MPIPE_LINK_EXCL_STATS may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_STATS is assumed.
+ */
+#define GXIO_MPIPE_LINK_NO_STATS           0x00000010UL
+
+/** Request exclusive stats permission -- that is, the ability to read and
+ *  write registers which contain link statistics, and to get link
+ *  attributes -- on the specified link.  No other processes may request
+ *  stats permission on this link, and if any process already
+ *  has stats permission on it, this open will fail.
+ *
+ *  Requesting exclusive stats permission is normally a very bad idea, since
+ *  it prevents programs like mpipe-stat from providing information on this
+ *  link.  Applications should only do this if they use MAC statistics
+ *  registers, and cannot tolerate any of the clear-on-read registers being
+ *  reset by other statistics programs.
+ *
+ *  No more than one of ::GXIO_MPIPE_LINK_STATS, ::GXIO_MPIPE_LINK_NO_STATS,
+ *  or ::GXIO_MPIPE_LINK_EXCL_STATS may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_STATS is assumed.
+ */
+#define GXIO_MPIPE_LINK_EXCL_STATS         0x00000020UL
+
+/** Request shared control permission -- that is, the ability to modify link
+ *  attributes, and read and write MAC and MDIO registers -- on the
+ *  specified link.  Other processes may also request shared control
+ *  permission on the same link.
+ *
+ *  No more than one of ::GXIO_MPIPE_LINK_CTL, ::GXIO_MPIPE_LINK_NO_CTL,
+ *  or ::GXIO_MPIPE_LINK_EXCL_CTL may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_CTL is assumed.
+ */
+#define GXIO_MPIPE_LINK_CTL                0x00000040UL
+
+/** Do not request control permission on the specified link.
+ *
+ *  No more than one of ::GXIO_MPIPE_LINK_CTL, ::GXIO_MPIPE_LINK_NO_CTL,
+ *  or ::GXIO_MPIPE_LINK_EXCL_CTL may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_CTL is assumed.
+ */
+#define GXIO_MPIPE_LINK_NO_CTL             0x00000080UL
+
+/** Request exclusive control permission -- that is, the ability to modify
+ *  link attributes, and read and write MAC and MDIO registers -- on the
+ *  specified link.  No other processes may request control permission on
+ *  this link, and if any process already has control permission on it,
+ *  this open will fail.
+ *
+ *  Requesting exclusive control permission is not always a good idea, since
+ *  it prevents programs like mpipe-link from configuring the link.
+ *
+ *  No more than one of ::GXIO_MPIPE_LINK_CTL, ::GXIO_MPIPE_LINK_NO_CTL,
+ *  or ::GXIO_MPIPE_LINK_EXCL_CTL may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_CTL is assumed.
+ */
+#define GXIO_MPIPE_LINK_EXCL_CTL           0x00000100UL
+
+/** Set the desired state of the link to up, allowing any speeds which are
+ *  supported by the link hardware, as part of this open operation; do not
+ *  change the desired state of the link when it is closed or the process
+ *  exits.  No more than one of ::GXIO_MPIPE_LINK_AUTO_UP,
+ *  ::GXIO_MPIPE_LINK_AUTO_UPDOWN, ::GXIO_MPIPE_LINK_AUTO_DOWN, or
+ *  ::GXIO_MPIPE_LINK_AUTO_NONE may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_AUTO_UPDOWN is assumed.
+ */
+#define GXIO_MPIPE_LINK_AUTO_UP            0x00000200UL
+
+/** Set the desired state of the link to up, allowing any speeds which are
+ *  supported by the link hardware, as part of this open operation; when the
+ *  link is closed or this process exits, if no other process has the link
+ *  open, set the desired state of the link to down.  No more than one of
+ *  ::GXIO_MPIPE_LINK_AUTO_UP, ::GXIO_MPIPE_LINK_AUTO_UPDOWN,
+ *  ::GXIO_MPIPE_LINK_AUTO_DOWN, or ::GXIO_MPIPE_LINK_AUTO_NONE may be
+ *  specifed in a gxio_mpipe_link_open() call.  If none are specified,
+ *  ::GXIO_MPIPE_LINK_AUTO_UPDOWN is assumed.
+ */
+#define GXIO_MPIPE_LINK_AUTO_UPDOWN        0x00000400UL
+
+/** Do not change the desired state of the link as part of the open
+ *  operation; when the link is closed or this process exits, if no other
+ *  process has the link open, set the desired state of the link to down.
+ *  No more than one of ::GXIO_MPIPE_LINK_AUTO_UP,
+ *  ::GXIO_MPIPE_LINK_AUTO_UPDOWN, ::GXIO_MPIPE_LINK_AUTO_DOWN, or
+ *  ::GXIO_MPIPE_LINK_AUTO_NONE may be specifed in a gxio_mpipe_link_open()
+ *  call.  If none are specified, ::GXIO_MPIPE_LINK_AUTO_UPDOWN is assumed.
+ */
+#define GXIO_MPIPE_LINK_AUTO_DOWN          0x00000800UL
+
+/** Do not change the desired state of the link as part of the open
+ *  operation; do not change the desired state of the link when it is
+ *  closed or the process exits.  No more than one of
+ *  ::GXIO_MPIPE_LINK_AUTO_UP, ::GXIO_MPIPE_LINK_AUTO_UPDOWN,
+ *  ::GXIO_MPIPE_LINK_AUTO_DOWN, or ::GXIO_MPIPE_LINK_AUTO_NONE may be
+ *  specifed in a gxio_mpipe_link_open() call.  If none are specified,
+ *  ::GXIO_MPIPE_LINK_AUTO_UPDOWN is assumed.
+ */
+#define GXIO_MPIPE_LINK_AUTO_NONE          0x00001000UL
+
+/** Request that this open call not complete until the network link is up.
+ *  The process will wait as long as necessary for this to happen;
+ *  applications which wish to abandon waiting for the link after a
+ *  specific time period should not specify this flag when opening a link,
+ *  but should instead call gxio_mpipe_link_wait() afterward.  The link
+ *  must be opened with stats permission.  Note that this flag by itself
+ *  does not change the desired link state; if other open flags or previous
+ *  link state changes have not requested a desired state of up, the open
+ *  call will never complete.  This flag is not available to kernel
+ *  clients.
+ */
+#define GXIO_MPIPE_LINK_WAIT               0x00002000UL
+
+
+/*
+ * Note: link attributes must fit in 24 bits, since we use the top 8 bits
+ * of the IORPC offset word for the channel number.
+ */
+
+/** Determine whether jumbo frames may be received.  If this attribute's
+ *  value value is nonzero, the MAC will accept frames of up to 10240 bytes.
+ *  If the value is zero, the MAC will only accept frames of up to 1544
+ *  bytes.  The default value is zero. */
+#define GXIO_MPIPE_LINK_RECEIVE_JUMBO      0x010000
+
+/** Determine whether to send pause frames on this link if the mPIPE packet
+ *  FIFO is nearly full.  If the value is zero, pause frames are not sent.
+ *  If the value is nonzero, it is the delay value which will be sent in any
+ *  pause frames which are output, in units of 512 bit times.
+ *
+ *  Bear in mind that in almost all circumstances, the mPIPE packet FIFO
+ *  will never fill up, since mPIPE will empty it as fast as or faster than
+ *  the incoming data rate, by either delivering or dropping packets.  The
+ *  only situation in which this is not true is if the memory and cache
+ *  subsystem is extremely heavily loaded, and mPIPE cannot perform DMA of
+ *  packet data to memory in a timely fashion.  In particular, pause frames
+ *  will <em>not</em> be sent if packets cannot be delivered because
+ *  NotifRings are full, buckets are full, or buffers are not available in
+ *  a buffer stack. */
+#define GXIO_MPIPE_LINK_SEND_PAUSE         0x020000
+
+/** Determine whether to suspend output on the receipt of pause frames.
+ *  If the value is nonzero, mPIPE shim will suspend output on the link's
+ *  channel when a pause frame is received.  If the value is zero, pause
+ *  frames will be ignored.  The default value is zero. */
+#define GXIO_MPIPE_LINK_RECEIVE_PAUSE      0x030000
+
+/** Interface MAC address.  The value is a 6-byte MAC address, in the least
+ *  significant 48 bits of the value; in other words, an address which would
+ *  be printed as '12:34:56:78:90:AB' in IEEE 802 canonical format would
+ *  be returned as 0x12345678ab.
+ *
+ *  Depending upon the overall system design, a MAC address may or may not
+ *  be available for each interface.  Note that the interface's MAC address
+ *  does not limit the packets received on its channel, although the
+ *  classifier's rules could be configured to do that.  Similarly, the MAC
+ *  address is not used when transmitting packets, although applications
+ *  could certainly decide to use the assigned address as a source MAC
+ *  address when doing so.  This attribute may only be retrieved with
+ *  gxio_mpipe_link_get_attr(); it may not be modified.
+ */
+#define GXIO_MPIPE_LINK_MAC                0x040000
+
+/** Determine whether to discard egress packets on link down. If this value
+ *  is nonzero, packets sent on this link while the link is down will be
+ *  discarded.  If this value is zero, no packets will be sent on this link
+ *  while it is down.  The default value is one. */
+#define GXIO_MPIPE_LINK_DISCARD_IF_DOWN    0x050000
+
+/** Possible link state.  The value is a combination of link state flags,
+ *  ORed together, that indicate link modes which are actually supported by
+ *  the hardware.  This attribute may only be retrieved with
+ *  gxio_mpipe_link_get_attr(); it may not be modified. */
+#define GXIO_MPIPE_LINK_POSSIBLE_STATE     0x060000
+
+/** Current link state.  The value is a combination of link state flags,
+ *  ORed together, that indicate the current state of the hardware.  If the
+ *  link is down, the value ANDed with ::GXIO_MPIPE_LINK_SPEED will be zero;
+ *  if the link is up, the value ANDed with ::GXIO_MPIPE_LINK_SPEED will
+ *  result in exactly one of the speed values, indicating the current speed.
+ *  This attribute may only be retrieved with gxio_mpipe_link_get_attr(); it
+ *  may not be modified. */
+#define GXIO_MPIPE_LINK_CURRENT_STATE      0x070000
+
+/** Desired link state. The value is a conbination of flags, which specify
+ *  the desired state for the link.  With gxio_mpipe_link_set_attr(), this
+ *  will, in the background, attempt to bring up the link using whichever of
+ *  the requested flags are reasonable, or take down the link if the flags
+ *  are zero.  The actual link up or down operation may happen after this
+ *  call completes.  If the link state changes in the future, the system
+ *  will continue to try to get back to the desired link state; for
+ *  instance, if the link is brought up successfully, and then the network
+ *  cable is disconnected, the link will go down.  However, the desired
+ *  state of the link is still up, so if the cable is reconnected, the link
+ *  will be brought up again.
+ *
+ *  With gxio_mpipe_link_set_attr(), this will indicate the desired state
+ *  for the link, as set with a previous gxio_mpipe_link_set_attr() call,
+ *  or implicitly by a gxio_mpipe_link_open() or link close operation.
+ *  This may not reflect the current state of the link; to get that, use
+ *  ::GXIO_MPIPE_LINK_CURRENT_STATE.
+ */
+#define GXIO_MPIPE_LINK_DESIRED_STATE      0x080000
+
+
+
+/** Link can run, should run, or is running at 10 Mbps. */
+#define GXIO_MPIPE_LINK_10M        0x0000000000000001UL
+
+/** Link can run, should run, or is running at 100 Mbps. */
+#define GXIO_MPIPE_LINK_100M       0x0000000000000002UL
+
+/** Link can run, should run, or is running at 1 Gbps. */
+#define GXIO_MPIPE_LINK_1G         0x0000000000000004UL
+
+/** Link can run, should run, or is running at 10 Gbps. */
+#define GXIO_MPIPE_LINK_10G        0x0000000000000008UL
+
+/** Link can run, should run, or is running at 20 Gbps. */
+#define GXIO_MPIPE_LINK_20G        0x0000000000000010UL
+
+/** Link can run, should run, or is running at 25 Gbps. */
+#define GXIO_MPIPE_LINK_25G        0x0000000000000020UL
+
+/** Link can run, should run, or is running at 50 Gbps. */
+#define GXIO_MPIPE_LINK_50G        0x0000000000000040UL
+
+/** Link should run at the highest speed supported by the link and by
+ *  the device connected to the link.  Only usable as a value for
+ *  the link's desired state; never returned as a value for the current
+ *  or possible states. */
+#define GXIO_MPIPE_LINK_ANYSPEED   0x0000000000000800UL
+
+/** All legal link speeds.  This value is provided for use in extracting
+ *  the speed-related subset of the link state flags; it is not intended
+ *  to be set directly as a value for one of the GXIO_MPIPE_LINK_xxx_STATE
+ *  attributes.  A link is up or is requested to be up if its current or
+ *  desired state, respectively, ANDED with this value, is nonzero. */
+#define GXIO_MPIPE_LINK_SPEED_MASK 0x0000000000000FFFUL
+
+/** Link can run, should run, or is running in MAC loopback mode.  This
+ *  loops transmitted packets back to the receiver, inside the Tile
+ *  Processor. */
+#define GXIO_MPIPE_LINK_LOOP_MAC   0x0000000000001000UL
+
+/** Link can run, should run, or is running in PHY loopback mode.  This
+ *  loops transmitted packets back to the receiver, inside the external
+ *  PHY chip. */
+#define GXIO_MPIPE_LINK_LOOP_PHY   0x0000000000002000UL
+
+/** Link can run, should run, or is running in external loopback mode.
+ *  This requires that an external loopback plug be installed on the
+ *  Ethernet port.  Note that only some links require that this be
+ *  configured via the gxio_mpipe_link routines; other links can do
+ *  external loopack with the plug and no special configuration. */
+#define GXIO_MPIPE_LINK_LOOP_EXT   0x0000000000004000UL
+
+/** All legal loopback types. */
+#define GXIO_MPIPE_LINK_LOOP_MASK  0x000000000000F000UL
+
+/** Link can run, should run, or is running in full-duplex mode.
+ *  If neither ::GXIO_MPIPE_LINK_FDX nor ::GXIO_MPIPE_LINK_HDX are
+ *  specified in a set of desired state flags, both are assumed. */
+#define GXIO_MPIPE_LINK_FDX        0x0000000000010000UL
+
+/** Link can run, should run, or is running in half-duplex mode.
+ *  If neither ::GXIO_MPIPE_LINK_FDX nor ::GXIO_MPIPE_LINK_HDX are
+ *  specified in a set of desired state flags, both are assumed. */
+#define GXIO_MPIPE_LINK_HDX        0x0000000000020000UL
+
+
+/** An individual rule. */
+typedef struct
+{
+  /** The total size. */
+  uint16_t size;
+
+  /** The priority. */
+  int16_t priority;
+
+  /** The "headroom" in each buffer. */
+  uint8_t headroom;
+
+  /** The "tailroom" in each buffer. */
+  uint8_t tailroom;
+
+  /** The "capacity" of the largest buffer. */
+  uint16_t capacity;
+
+  /** The mask for converting a flow hash into a bucket. */
+  uint16_t bucket_mask;
+
+  /** The offset for converting a flow hash into a bucket. */
+  uint16_t bucket_first;
+
+  /** The buffer stack ids. */
+  gxio_mpipe_rules_stacks_t stacks;
+
+  /** The actual channels. */
+  uint32_t channel_bits;
+
+  /** The number of dmacs. */
+  uint16_t num_dmacs;
+
+  /** The number of vlans. */
+  uint16_t num_vlans;
+
+  /** The actual dmacs and vlans. */
+  uint8_t dmacs_and_vlans[];
+
+} gxio_mpipe_rules_rule_t;
+
+
+/** A list of classifier rules. */
+typedef struct
+{
+  /** The offset to the end of the current rule. */
+  uint16_t tail;
+
+  /** The offset to the start of the current rule. */
+  uint16_t head;
+
+  /** The actual rules. */
+  uint8_t rules[4096 - 4];
+
+} gxio_mpipe_rules_list_t;
+
+
+
+
+/** mPIPE statistics structure. These counters include all relevant
+ *  events occurring on all links within the mPIPE shim. */
+typedef struct
+{
+  /** Number of ingress packets dropped for any reason. */
+  uint64_t ingress_drops;
+  /** Number of ingress packets dropped because a buffer stack was empty. */
+  uint64_t ingress_drops_no_buf;
+  /** Number of ingress packets dropped or truncated due to lack of space in
+   *  the iPkt buffer. */
+  uint64_t ingress_drops_ipkt;
+  /** Number of ingress packets dropped by the classifier or load balancer */
+  uint64_t ingress_drops_cls_lb;
+  /** Total number of ingress packets. */
+  uint64_t ingress_packets;
+  /** Total number of egress packets. */
+  uint64_t egress_packets;
+  /** Total number of ingress bytes. */
+  uint64_t ingress_bytes;
+  /** Total number of egress bytes. */
+  uint64_t egress_bytes;
+}
+gxio_mpipe_stats_t;
+
+
+#endif /* _SYS_HV_DRV_MPIPE_INTF_H */

arch/tile/include/hv/drv_trio_intf.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/**
+ * Interface definitions for the trio driver.
+ */
+
+#ifndef _SYS_HV_DRV_TRIO_INTF_H
+#define _SYS_HV_DRV_TRIO_INTF_H
+
+#include <arch/trio.h>
+
+/** The vendor ID for all Tilera processors. */
+#define TILERA_VENDOR_ID 0x1a41
+
+/** The device ID for the Gx36 processor. */
+#define TILERA_GX36_DEV_ID 0x0200
+
+/** Device ID for our internal bridge when running as RC. */
+#define TILERA_GX36_RC_DEV_ID 0x2000
+
+/** Maximum number of TRIO interfaces. */
+#define TILEGX_NUM_TRIO         2
+
+/** Gx36 has max 3 PCIe MACs per TRIO interface. */
+#define TILEGX_TRIO_PCIES       3
+
+/** Specify port properties for a PCIe MAC. */
+struct pcie_port_property
+{
+  /** If true, the link can be configured in PCIe root complex mode. */
+  uint8_t allow_rc: 1;
+
+  /** If true, the link can be configured in PCIe endpoint mode. */
+  uint8_t allow_ep: 1;
+
+  /** If true, the link can be configured in StreamIO mode. */
+  uint8_t allow_sio: 1;
+
+  /** If true, the link is allowed to support 1-lane operation. Software
+   *  will not consider it an error if the link comes up as a x1 link. */
+  uint8_t allow_x1: 1;
+
+  /** If true, the link is allowed to support 2-lane operation. Software
+   *  will not consider it an error if the link comes up as a x2 link. */
+  uint8_t allow_x2: 1;
+
+  /** If true, the link is allowed to support 4-lane operation. Software
+   *  will not consider it an error if the link comes up as a x4 link. */
+  uint8_t allow_x4: 1;
+
+  /** If true, the link is allowed to support 8-lane operation. Software
+   *  will not consider it an error if the link comes up as a x8 link. */
+  uint8_t allow_x8: 1;
+
+  /** Reserved. */
+  uint8_t reserved: 1;
+
+};
+
+/** Configurations can be issued to configure a char stream interrupt. */
+typedef enum pcie_stream_intr_config_sel_e
+{
+  /** Interrupt configuration for memory map regions. */
+  MEM_MAP_SEL,
+
+  /** Interrupt configuration for push DMAs. */
+  PUSH_DMA_SEL,
+
+  /** Interrupt configuration for pull DMAs. */
+  PULL_DMA_SEL,
+}
+pcie_stream_intr_config_sel_t;
+
+
+/** The mmap file offset (PA) of the TRIO config region. */
+#define HV_TRIO_CONFIG_OFFSET                                        \
+  ((unsigned long long)TRIO_MMIO_ADDRESS_SPACE__REGION_VAL_CFG <<   \
+    TRIO_MMIO_ADDRESS_SPACE__REGION_SHIFT)
+
+/** The maximum size of the TRIO config region. */
+#define HV_TRIO_CONFIG_SIZE                                 \
+  (1ULL << TRIO_CFG_REGION_ADDR__REGION_SHIFT)
+
+/** Size of the config region mapped into client. We can't use
+ *  TRIO_MMIO_ADDRESS_SPACE__OFFSET_WIDTH because it
+ *  will require the kernel to allocate 4GB VA space
+ *  from the VMALLOC region which has a total range
+ *  of 4GB.
+ */
+#define HV_TRIO_CONFIG_IOREMAP_SIZE                            \
+  ((uint64_t) 1 << TRIO_CFG_REGION_ADDR__PROT_SHIFT)
+
+/** The mmap file offset (PA) of a scatter queue region. */
+#define HV_TRIO_SQ_OFFSET(queue)                                        \
+  (((unsigned long long)TRIO_MMIO_ADDRESS_SPACE__REGION_VAL_MAP_SQ <<   \
+    TRIO_MMIO_ADDRESS_SPACE__REGION_SHIFT) |                            \
+   ((queue) << TRIO_MAP_SQ_REGION_ADDR__SQ_SEL_SHIFT))
+
+/** The maximum size of a scatter queue region. */
+#define HV_TRIO_SQ_SIZE                                 \
+  (1ULL << TRIO_MAP_SQ_REGION_ADDR__SQ_SEL_SHIFT)
+
+
+/** The "hardware MMIO region" of the first PIO region. */
+#define HV_TRIO_FIRST_PIO_REGION 8
+
+/** The mmap file offset (PA) of a PIO region. */
+#define HV_TRIO_PIO_OFFSET(region)                           \
+  (((unsigned long long)(region) + HV_TRIO_FIRST_PIO_REGION) \
+   << TRIO_PIO_REGIONS_ADDR__REGION_SHIFT)
+
+/** The maximum size of a PIO region. */
+#define HV_TRIO_PIO_SIZE (1ULL << TRIO_PIO_REGIONS_ADDR__ADDR_WIDTH)
+
+
+/** The mmap file offset (PA) of a push DMA region. */
+#define HV_TRIO_PUSH_DMA_OFFSET(ring)                                   \
+  (((unsigned long long)TRIO_MMIO_ADDRESS_SPACE__REGION_VAL_PUSH_DMA << \
+    TRIO_MMIO_ADDRESS_SPACE__REGION_SHIFT) |                            \
+   ((ring) << TRIO_PUSH_DMA_REGION_ADDR__RING_SEL_SHIFT))
+
+/** The mmap file offset (PA) of a pull DMA region. */
+#define HV_TRIO_PULL_DMA_OFFSET(ring)                                   \
+  (((unsigned long long)TRIO_MMIO_ADDRESS_SPACE__REGION_VAL_PULL_DMA << \
+    TRIO_MMIO_ADDRESS_SPACE__REGION_SHIFT) |                            \
+   ((ring) << TRIO_PULL_DMA_REGION_ADDR__RING_SEL_SHIFT))
+
+/** The maximum size of a DMA region. */
+#define HV_TRIO_DMA_REGION_SIZE                         \
+  (1ULL << TRIO_PUSH_DMA_REGION_ADDR__RING_SEL_SHIFT)
+
+
+/** The mmap file offset (PA) of a Mem-Map interrupt region. */
+#define HV_TRIO_MEM_MAP_INTR_OFFSET(map)                                 \
+  (((unsigned long long)TRIO_MMIO_ADDRESS_SPACE__REGION_VAL_MAP_MEM <<   \
+    TRIO_MMIO_ADDRESS_SPACE__REGION_SHIFT) |                            \
+   ((map) << TRIO_MAP_MEM_REGION_ADDR__MAP_SEL_SHIFT))
+
+/** The maximum size of a Mem-Map interrupt region. */
+#define HV_TRIO_MEM_MAP_INTR_SIZE                                 \
+  (1ULL << TRIO_MAP_MEM_REGION_ADDR__MAP_SEL_SHIFT)
+
+
+/** A flag bit indicating a fixed resource allocation. */
+#define HV_TRIO_ALLOC_FIXED 0x01
+
+/** TRIO requires that all mappings have 4kB aligned start addresses. */
+#define HV_TRIO_PAGE_SHIFT 12
+
+/** TRIO requires that all mappings have 4kB aligned start addresses. */
+#define HV_TRIO_PAGE_SIZE (1ull << HV_TRIO_PAGE_SHIFT)
+
+
+/* Specify all PCIe port properties for a TRIO. */
+struct pcie_trio_ports_property
+{
+  struct pcie_port_property ports[TILEGX_TRIO_PCIES];
+};
+
+/* Flags indicating traffic class. */
+#define HV_TRIO_FLAG_TC_SHIFT 4
+#define HV_TRIO_FLAG_TC_RMASK 0xf
+#define HV_TRIO_FLAG_TC(N) \
+  ((((N) & HV_TRIO_FLAG_TC_RMASK) + 1) << HV_TRIO_FLAG_TC_SHIFT)
+
+/* Flags indicating virtual functions. */
+#define HV_TRIO_FLAG_VFUNC_SHIFT 8
+#define HV_TRIO_FLAG_VFUNC_RMASK 0xff
+#define HV_TRIO_FLAG_VFUNC(N) \
+  ((((N) & HV_TRIO_FLAG_VFUNC_RMASK) + 1) << HV_TRIO_FLAG_VFUNC_SHIFT)
+
+
+/* Flag indicating an ordered PIO region. */
+#define HV_TRIO_PIO_FLAG_ORDERED (1 << 16)
+
+/* Flags indicating special types of PIO regions. */
+#define HV_TRIO_PIO_FLAG_SPACE_SHIFT 17
+#define HV_TRIO_PIO_FLAG_SPACE_MASK (0x3 << HV_TRIO_PIO_FLAG_SPACE_SHIFT)
+#define HV_TRIO_PIO_FLAG_CONFIG_SPACE (0x1 << HV_TRIO_PIO_FLAG_SPACE_SHIFT)
+#define HV_TRIO_PIO_FLAG_IO_SPACE (0x2 << HV_TRIO_PIO_FLAG_SPACE_SHIFT)
+
+
+#endif /* _SYS_HV_DRV_TRIO_INTF_H */

arch/tile/include/hv/drv_usb_host_intf.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/**
+ * Interface definitions for the USB host driver.
+ */
+
+#ifndef _SYS_HV_DRV_USB_HOST_INTF_H
+#define _SYS_HV_DRV_USB_HOST_INTF_H
+
+#include <arch/usb_host.h>
+
+
+/** Offset for the EHCI register MMIO region. */
+#define HV_USB_HOST_MMIO_OFFSET_EHCI ((uint64_t) USB_HOST_HCCAPBASE_REG)
+
+/** Offset for the OHCI register MMIO region. */
+#define HV_USB_HOST_MMIO_OFFSET_OHCI ((uint64_t) USB_HOST_OHCD_HC_REVISION_REG)
+
+/** Size of the register MMIO region.  This turns out to be the same for
+ *  both EHCI and OHCI. */
+#define HV_USB_HOST_MMIO_SIZE ((uint64_t) 0x1000)
+
+/** The number of service domains supported by the USB host shim. */
+#define HV_USB_HOST_NUM_SVC_DOM 1
+
+
+#endif /* _SYS_HV_DRV_USB_HOST_INTF_H */

arch/tile/include/hv/iorpc.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+#ifndef _HV_IORPC_H_
+#define _HV_IORPC_H_
+
+/**
+ *
+ * Error codes and struct definitions for the IO RPC library.
+ *
+ * The hypervisor's IO RPC component provides a convenient way for
+ * driver authors to proxy system calls between user space, linux, and
+ * the hypervisor driver.  The core of the system is a set of Python
+ * files that take ".idl" files as input and generates the following
+ * source code:
+ *
+ * - _rpc_call() routines for use in userspace IO libraries.  These
+ * routines take an argument list specified in the .idl file, pack the
+ * arguments in to a buffer, and read or write that buffer via the
+ * Linux iorpc driver.
+ *
+ * - dispatch_read() and dispatch_write() routines that hypervisor
+ * drivers can use to implement most of their dev_pread() and
+ * dev_pwrite() methods.  These routines decode the incoming parameter
+ * blob, permission check and translate parameters where appropriate,
+ * and then invoke a callback routine for whichever RPC call has
+ * arrived.  The driver simply implements the set of callback
+ * routines.
+ *
+ * The IO RPC system also includes the Linux 'iorpc' driver, which
+ * proxies calls between the userspace library and the hypervisor
+ * driver.  The Linux driver is almost entirely device agnostic; it
+ * watches for special flags indicating cases where a memory buffer
+ * address might need to be translated, etc.  As a result, driver
+ * writers can avoid many of the problem cases related to registering
+ * hardware resources like memory pages or interrupts.  However, the
+ * drivers must be careful to obey the conventions documented below in
+ * order to work properly with the generic Linux iorpc driver.
+ *
+ * @section iorpc_domains Service Domains
+ *
+ * All iorpc-based drivers must support a notion of service domains.
+ * A service domain is basically an application context - state
+ * indicating resources that are allocated to that particular app
+ * which it may access and (perhaps) other applications may not
+ * access.  Drivers can support any number of service domains they
+ * choose.  In some cases the design is limited by a number of service
+ * domains supported by the IO hardware; in other cases the service
+ * domains are a purely software concept and the driver chooses a
+ * maximum number of domains based on how much state memory it is
+ * willing to preallocate.
+ *
+ * For example, the mPIPE driver only supports as many service domains
+ * as are supported by the mPIPE hardware.  This limitation is
+ * required because the hardware implements its own MMIO protection
+ * scheme to allow large MMIO mappings while still protecting small
+ * register ranges within the page that should only be accessed by the
+ * hypervisor.
+ *
+ * In contrast, drivers with no hardware service domain limitations
+ * (for instance the TRIO shim) can implement an arbitrary number of
+ * service domains.  In these cases, each service domain is limited to
+ * a carefully restricted set of legal MMIO addresses if necessary to
+ * keep one application from corrupting another application's state.
+ *
+ * @section iorpc_conventions System Call Conventions
+ *
+ * The driver's open routine is responsible for allocating a new
+ * service domain for each hv_dev_open() call.  By convention, the
+ * return value from open() should be the service domain number on
+ * success, or GXIO_ERR_NO_SVC_DOM if no more service domains are
+ * available.
+ *
+ * The implementations of hv_dev_pread() and hv_dev_pwrite() are
+ * responsible for validating the devhdl value passed up by the
+ * client.  Since the device handle returned by hv_dev_open() should
+ * embed the positive service domain number, drivers should make sure
+ * that DRV_HDL2BITS(devhdl) is a legal service domain.  If the client
+ * passes an illegal service domain number, the routine should return
+ * GXIO_ERR_INVAL_SVC_DOM.  Once the service domain number has been
+ * validated, the driver can copy to/from the client buffer and call
+ * the dispatch_read() or dispatch_write() methods created by the RPC
+ * generator.
+ *
+ * The hv_dev_close() implementation should reset all service domain
+ * state and put the service domain back on a free list for
+ * reallocation by a future application.  In most cases, this will
+ * require executing a hardware reset or drain flow and denying any
+ * MMIO regions that were created for the service domain.
+ *
+ * @section iorpc_data Special Data Types
+ *
+ * The .idl file syntax allows the creation of syscalls with special
+ * parameters that require permission checks or translations as part
+ * of the system call path.  Because of limitations in the code
+ * generator, APIs are generally limited to just one of these special
+ * parameters per system call, and they are sometimes required to be
+ * the first or last parameter to the call.  Special parameters
+ * include:
+ *
+ * @subsection iorpc_mem_buffer MEM_BUFFER
+ *
+ * The MEM_BUFFER() datatype allows user space to "register" memory
+ * buffers with a device.  Registering memory accomplishes two tasks:
+ * Linux keeps track of all buffers that might be modified by a
+ * hardware device, and the hardware device drivers bind registered
+ * buffers to particular hardware resources like ingress NotifRings.
+ * The MEM_BUFFER() idl syntax can take extra flags like ALIGN_64KB,
+ * ALIGN_SELF_SIZE, and FLAGS indicating that memory buffers must have
+ * certain alignment or that the user should be able to pass a "memory
+ * flags" word specifying attributes like nt_hint or IO cache pinning.
+ * The parser will accept multiple MEM_BUFFER() flags.
+ *
+ * Implementations must obey the following conventions when
+ * registering memory buffers via the iorpc flow.  These rules are a
+ * result of the Linux driver implementation, which needs to keep
+ * track of how many times a particular page has been registered with
+ * the hardware so that it can release the page when all those
+ * registrations are cleared.
+ *
+ * - Memory registrations that refer to a resource which has already
+ * been bound must return GXIO_ERR_ALREADY_INIT.  Thus, it is an
+ * error to register memory twice without resetting (i.e. closing) the
+ * resource in between.  This convention keeps the Linux driver from
+ * having to track which particular devices a page is bound to.
+ *
+ * - At present, a memory registration is only cleared when the
+ * service domain is reset.  In this case, the Linux driver simply
+ * closes the HV device file handle and then decrements the reference
+ * counts of all pages that were previously registered with the
+ * device.
+ *
+ * - In the future, we may add a mechanism for unregistering memory.
+ * One possible implementation would require that the user specify
+ * which buffer is currently registered.  The HV would then verify
+ * that that page was actually the one currently mapped and return
+ * success or failure to Linux, which would then only decrement the
+ * page reference count if the addresses were mapped.  Another scheme
+ * might allow Linux to pass a token to the HV to be returned when the
+ * resource is unmapped.
+ *
+ * @subsection iorpc_interrupt INTERRUPT
+ *
+ * The INTERRUPT .idl datatype allows the client to bind hardware
+ * interrupts to a particular combination of IPI parameters - CPU, IPI
+ * PL, and event bit number.  This data is passed via a special
+ * datatype so that the Linux driver can validate the CPU and PL and
+ * the HV generic iorpc code can translate client CPUs to real CPUs.
+ *
+ * @subsection iorpc_pollfd_setup POLLFD_SETUP
+ *
+ * The POLLFD_SETUP .idl datatype allows the client to set up hardware
+ * interrupt bindings which are received by Linux but which are made
+ * visible to user processes as state transitions on a file descriptor;
+ * this allows user processes to use Linux primitives, such as poll(), to
+ * await particular hardware events.  This data is passed via a special
+ * datatype so that the Linux driver may recognize the pollable file
+ * descriptor and translate it to a set of interrupt target information,
+ * and so that the HV generic iorpc code can translate client CPUs to real
+ * CPUs.
+ *
+ * @subsection iorpc_pollfd POLLFD
+ *
+ * The POLLFD .idl datatype allows manipulation of hardware interrupt
+ * bindings set up via the POLLFD_SETUP datatype; common operations are
+ * resetting the state of the requested interrupt events, and unbinding any
+ * bound interrupts.  This data is passed via a special datatype so that
+ * the Linux driver may recognize the pollable file descriptor and
+ * translate it to an interrupt identifier previously supplied by the
+ * hypervisor as the result of an earlier pollfd_setup operation.
+ *
+ * @subsection iorpc_blob BLOB
+ *
+ * The BLOB .idl datatype allows the client to write an arbitrary
+ * length string of bytes up to the hypervisor driver.  This can be
+ * useful for passing up large, arbitrarily structured data like
+ * classifier programs.  The iorpc stack takes care of validating the
+ * buffer VA and CPA as the data passes up to the hypervisor.  Unlike
+ * MEM_BUFFER(), the buffer is not registered - Linux does not bump
+ * page refcounts and the HV driver should not reuse the buffer once
+ * the system call is complete.
+ *
+ * @section iorpc_translation Translating User Space Calls
+ *
+ * The ::iorpc_offset structure describes the formatting of the offset
+ * that is passed to pread() or pwrite() as part of the generated RPC code.
+ * When the user calls up to Linux, the rpc code fills in all the fields of
+ * the offset, including a 16-bit opcode, a 16 bit format indicator, and 32
+ * bits of user-specified "sub-offset".  The opcode indicates which syscall
+ * is being requested.  The format indicates whether there is a "prefix
+ * struct" at the start of the memory buffer passed to pwrite(), and if so
+ * what data is in that prefix struct.  These prefix structs are used to
+ * implement special datatypes like MEM_BUFFER() and INTERRUPT - we arrange
+ * to put data that needs translation and permission checks at the start of
+ * the buffer so that the Linux driver and generic portions of the HV iorpc
+ * code can easily access the data.  The 32 bits of user-specified
+ * "sub-offset" are most useful for pread() calls where the user needs to
+ * also pass in a few bits indicating which register to read, etc.
+ *
+ * The Linux iorpc driver watches for system calls that contain prefix
+ * structs so that it can translate parameters and bump reference
+ * counts as appropriate.  It does not (currently) have any knowledge
+ * of the per-device opcodes - it doesn't care what operation you're
+ * doing to mPIPE, so long as it can do all the generic book-keeping.
+ * The hv/iorpc.h header file defines all of the generic encoding bits
+ * needed to translate iorpc calls without knowing which particular
+ * opcode is being issued.
+ *
+ * @section iorpc_globals Global iorpc Calls
+ *
+ * Implementing mmap() required adding some special iorpc syscalls
+ * that are only called by the Linux driver, never by userspace.
+ * These include get_mmio_base() and check_mmio_offset().  These
+ * routines are described in globals.idl and must be included in every
+ * iorpc driver.  By providing these routines in every driver, Linux's
+ * mmap implementation can easily get the PTE bits it needs and
+ * validate the PA offset without needing to know the per-device
+ * opcodes to perform those tasks.
+ *
+ * @section iorpc_kernel Supporting gxio APIs in the Kernel
+ *
+ * The iorpc code generator also supports generation of kernel code
+ * implementing the gxio APIs.  This capability is currently used by
+ * the mPIPE network driver, and will likely be used by the TRIO root
+ * complex and endpoint drivers and perhaps an in-kernel crypto
+ * driver.  Each driver that wants to instantiate iorpc calls in the
+ * kernel needs to generate a kernel version of the generate rpc code
+ * and (probably) copy any related gxio source files into the kernel.
+ * The mPIPE driver provides a good example of this pattern.
+ */
+
+#ifdef __KERNEL__
+#include <linux/stddef.h>
+#else
+#include <stddef.h>
+#endif
+
+#if defined(__HV__)
+#include <hv/hypervisor.h>
+#elif defined(__KERNEL__)
+#include "hypervisor.h"
+#include <linux/types.h>
+#else
+#include <stdint.h>
+#endif
+
+
+/** Code indicating translation services required within the RPC path.
+ * These indicate whether there is a translatable struct at the start
+ * of the RPC buffer and what information that struct contains.
+ */
+enum iorpc_format_e
+{
+  /** No translation required, no prefix struct. */
+  IORPC_FORMAT_NONE,
+
+  /** No translation required, no prefix struct, no access to this
+   *  operation from user space. */
+  IORPC_FORMAT_NONE_NOUSER,
+
+  /** Prefix struct contains user VA and size. */
+  IORPC_FORMAT_USER_MEM,
+
+  /** Prefix struct contains CPA, size, and homing bits. */
+  IORPC_FORMAT_KERNEL_MEM,
+
+  /** Prefix struct contains interrupt. */
+  IORPC_FORMAT_KERNEL_INTERRUPT,
+
+  /** Prefix struct contains user-level interrupt. */
+  IORPC_FORMAT_USER_INTERRUPT,
+
+  /** Prefix struct contains pollfd_setup (interrupt information). */
+  IORPC_FORMAT_KERNEL_POLLFD_SETUP,
+
+  /** Prefix struct contains user-level pollfd_setup (file descriptor). */
+  IORPC_FORMAT_USER_POLLFD_SETUP,
+
+  /** Prefix struct contains pollfd (interrupt cookie). */
+  IORPC_FORMAT_KERNEL_POLLFD,
+
+  /** Prefix struct contains user-level pollfd (file descriptor). */
+  IORPC_FORMAT_USER_POLLFD,
+};
+
+
+/** Generate an opcode given format and code. */
+#define IORPC_OPCODE(FORMAT, CODE) (((FORMAT) << 16) | (CODE))
+
+/** The offset passed through the read() and write() system calls
+    combines an opcode with 32 bits of user-specified offset. */
+union iorpc_offset
+{
+#ifndef __BIG_ENDIAN__
+  uint64_t offset;              /**< All bits. */
+
+  struct
+  {
+    uint16_t code;              /**< RPC code. */
+    uint16_t format;            /**< iorpc_format_e */
+    uint32_t sub_offset;        /**< caller-specified offset. */
+  };
+
+  uint32_t opcode;              /**< Opcode combines code & format. */
+#else
+  uint64_t offset;              /**< All bits. */
+
+  struct
+  {
+    uint32_t sub_offset;        /**< caller-specified offset. */
+    uint16_t format;            /**< iorpc_format_e */
+    uint16_t code;              /**< RPC code. */
+  };
+
+  struct
+  {
+    uint32_t padding;
+    uint32_t opcode;              /**< Opcode combines code & format. */
+  };
+#endif
+};
+
+
+/** Homing and cache hinting bits that can be used by IO devices. */
+struct iorpc_mem_attr
+{
+  unsigned int lotar_x:4;       /**< lotar X bits (or Gx page_mask). */
+  unsigned int lotar_y:4;       /**< lotar Y bits (or Gx page_offset). */
+  unsigned int hfh:1;           /**< Uses hash-for-home. */
+  unsigned int nt_hint:1;       /**< Non-temporal hint. */
+  unsigned int io_pin:1;        /**< Only fill 'IO' cache ways. */
+};
+
+/** Set the nt_hint bit. */
+#define IORPC_MEM_BUFFER_FLAG_NT_HINT (1 << 0)
+
+/** Set the IO pin bit. */
+#define IORPC_MEM_BUFFER_FLAG_IO_PIN (1 << 1)
+
+
+/** A structure used to describe memory registration.  Different
+    protection levels describe memory differently, so this union
+    contains all the different possible descriptions.  As a request
+    moves up the call chain, each layer translates from one
+    description format to the next.  In particular, the Linux iorpc
+    driver translates user VAs into CPAs and homing parameters. */
+union iorpc_mem_buffer
+{
+  struct
+  {
+    uint64_t va;                /**< User virtual address. */
+    uint64_t size;              /**< Buffer size. */
+    unsigned int flags;         /**< nt_hint, IO pin. */
+  }
+  user;                         /**< Buffer as described by user apps. */
+
+  struct
+  {
+    unsigned long long cpa;     /**< Client physical address. */
+#if defined(__KERNEL__) || defined(__HV__)
+    size_t size;                /**< Buffer size. */
+    HV_PTE pte;                 /**< PTE describing memory homing. */
+#else
+    uint64_t size;
+    uint64_t pte;
+#endif
+    unsigned int flags;         /**< nt_hint, IO pin. */
+  }
+  kernel;                       /**< Buffer as described by kernel. */
+
+  struct
+  {
+    unsigned long long pa;      /**< Physical address. */
+    size_t size;                /**< Buffer size. */
+    struct iorpc_mem_attr attr;      /**< Homing and locality hint bits. */
+  }
+  hv;                           /**< Buffer parameters for HV driver. */
+};
+
+
+/** A structure used to describe interrupts.  The format differs slightly
+ *  for user and kernel interrupts.  As with the mem_buffer_t, translation
+ *  between the formats is done at each level. */
+union iorpc_interrupt
+{
+  struct
+  {
+    int cpu;   /**< CPU. */
+    int event; /**< evt_num */
+  }
+  user;        /**< Interrupt as described by user applications. */
+
+  struct
+  {
+    int x;     /**< X coord. */
+    int y;     /**< Y coord. */
+    int ipi;   /**< int_num */
+    int event; /**< evt_num */
+  }
+  kernel;      /**< Interrupt as described by the kernel. */
+
+};
+
+
+/** A structure used to describe interrupts used with poll().  The format
+ *  differs significantly for requests from user to kernel, and kernel to
+ *  hypervisor.  As with the mem_buffer_t, translation between the formats
+ *  is done at each level. */
+union iorpc_pollfd_setup
+{
+  struct
+  {
+    int fd;    /**< Pollable file descriptor. */
+  }
+  user;        /**< pollfd_setup as described by user applications. */
+
+  struct
+  {
+    int x;     /**< X coord. */
+    int y;     /**< Y coord. */
+    int ipi;   /**< int_num */
+    int event; /**< evt_num */
+  }
+  kernel;      /**< pollfd_setup as described by the kernel. */
+
+};
+
+
+/** A structure used to describe previously set up interrupts used with
+ *  poll().  The format differs significantly for requests from user to
+ *  kernel, and kernel to hypervisor.  As with the mem_buffer_t, translation
+ *  between the formats is done at each level. */
+union iorpc_pollfd
+{
+  struct
+  {
+    int fd;    /**< Pollable file descriptor. */
+  }
+  user;        /**< pollfd as described by user applications. */
+
+  struct
+  {
+    int cookie; /**< hv cookie returned by the pollfd_setup operation. */
+  }
+  kernel;      /**< pollfd as described by the kernel. */
+
+};
+
+
+/** The various iorpc devices use error codes from -1100 to -1299.
+ *
+ * This range is distinct from netio (-700 to -799), the hypervisor
+ * (-800 to -899), tilepci (-900 to -999), ilib (-1000 to -1099),
+ * gxcr (-1300 to -1399) and gxpci (-1400 to -1499).
+ */
+enum gxio_err_e {
+
+  /** Largest iorpc error number. */
+  GXIO_ERR_MAX = -1101,
+
+
+  /********************************************************/
+  /*                   Generic Error Codes                */
+  /********************************************************/
+
+  /** Bad RPC opcode - possible version incompatibility. */
+  GXIO_ERR_OPCODE = -1101,
+
+  /** Invalid parameter. */
+  GXIO_ERR_INVAL = -1102,
+
+  /** Memory buffer did not meet alignment requirements. */
+  GXIO_ERR_ALIGNMENT = -1103,
+
+  /** Memory buffers must be coherent and cacheable. */
+  GXIO_ERR_COHERENCE = -1104,
+
+  /** Resource already initialized. */
+  GXIO_ERR_ALREADY_INIT = -1105,
+
+  /** No service domains available. */
+  GXIO_ERR_NO_SVC_DOM = -1106,
+
+  /** Illegal service domain number. */
+  GXIO_ERR_INVAL_SVC_DOM = -1107,
+
+  /** Illegal MMIO address. */
+  GXIO_ERR_MMIO_ADDRESS = -1108,
+
+  /** Illegal interrupt binding. */
+  GXIO_ERR_INTERRUPT = -1109,
+
+  /** Unreasonable client memory. */
+  GXIO_ERR_CLIENT_MEMORY = -1110,
+
+  /** No more IOTLB entries. */
+  GXIO_ERR_IOTLB_ENTRY = -1111,
+
+  /** Invalid memory size. */
+  GXIO_ERR_INVAL_MEMORY_SIZE = -1112,
+
+  /** Unsupported operation. */
+  GXIO_ERR_UNSUPPORTED_OP = -1113,
+
+  /** Insufficient DMA credits. */
+  GXIO_ERR_DMA_CREDITS = -1114,
+
+  /** Operation timed out. */
+  GXIO_ERR_TIMEOUT = -1115,
+
+  /** No such device or object. */
+  GXIO_ERR_NO_DEVICE = -1116,
+
+  /** Device or resource busy. */
+  GXIO_ERR_BUSY = -1117,
+
+  /** I/O error. */
+  GXIO_ERR_IO = -1118,
+
+  /** Permissions error. */
+  GXIO_ERR_PERM = -1119,
+
+
+
+  /********************************************************/
+  /*                 Test Device Error Codes              */
+  /********************************************************/
+
+  /** Illegal register number. */
+  GXIO_TEST_ERR_REG_NUMBER = -1120,
+
+  /** Illegal buffer slot. */
+  GXIO_TEST_ERR_BUFFER_SLOT = -1121,
+
+
+  /********************************************************/
+  /*                    MPIPE Error Codes                 */
+  /********************************************************/
+
+
+  /** Invalid buffer size. */
+  GXIO_MPIPE_ERR_INVAL_BUFFER_SIZE = -1131,
+
+  /** Cannot allocate buffer stack. */
+  GXIO_MPIPE_ERR_NO_BUFFER_STACK = -1140,
+
+  /** Invalid buffer stack number. */
+  GXIO_MPIPE_ERR_BAD_BUFFER_STACK = -1141,
+
+  /** Cannot allocate NotifRing. */
+  GXIO_MPIPE_ERR_NO_NOTIF_RING = -1142,
+
+  /** Invalid NotifRing number. */
+  GXIO_MPIPE_ERR_BAD_NOTIF_RING = -1143,
+
+  /** Cannot allocate NotifGroup. */
+  GXIO_MPIPE_ERR_NO_NOTIF_GROUP = -1144,
+
+  /** Invalid NotifGroup number. */
+  GXIO_MPIPE_ERR_BAD_NOTIF_GROUP = -1145,
+
+  /** Cannot allocate bucket. */
+  GXIO_MPIPE_ERR_NO_BUCKET = -1146,
+
+  /** Invalid bucket number. */
+  GXIO_MPIPE_ERR_BAD_BUCKET = -1147,
+
+  /** Cannot allocate eDMA ring. */
+  GXIO_MPIPE_ERR_NO_EDMA_RING = -1148,
+
+  /** Invalid eDMA ring number. */
+  GXIO_MPIPE_ERR_BAD_EDMA_RING = -1149,
+
+  /** Invalid channel number. */
+  GXIO_MPIPE_ERR_BAD_CHANNEL = -1150,
+
+  /** Bad configuration. */
+  GXIO_MPIPE_ERR_BAD_CONFIG = -1151,
+
+  /** Empty iqueue. */
+  GXIO_MPIPE_ERR_IQUEUE_EMPTY = -1152,
+
+  /** Empty rules. */
+  GXIO_MPIPE_ERR_RULES_EMPTY = -1160,
+
+  /** Full rules. */
+  GXIO_MPIPE_ERR_RULES_FULL = -1161,
+
+  /** Corrupt rules. */
+  GXIO_MPIPE_ERR_RULES_CORRUPT = -1162,
+
+  /** Invalid rules. */
+  GXIO_MPIPE_ERR_RULES_INVALID = -1163,
+
+  /** Classifier is too big. */
+  GXIO_MPIPE_ERR_CLASSIFIER_TOO_BIG = -1170,
+
+  /** Classifier is too complex. */
+  GXIO_MPIPE_ERR_CLASSIFIER_TOO_COMPLEX = -1171,
+
+  /** Classifier has bad header. */
+  GXIO_MPIPE_ERR_CLASSIFIER_BAD_HEADER = -1172,
+
+  /** Classifier has bad contents. */
+  GXIO_MPIPE_ERR_CLASSIFIER_BAD_CONTENTS = -1173,
+
+  /** Classifier encountered invalid symbol. */
+  GXIO_MPIPE_ERR_CLASSIFIER_INVAL_SYMBOL = -1174,
+
+  /** Classifier encountered invalid bounds. */
+  GXIO_MPIPE_ERR_CLASSIFIER_INVAL_BOUNDS = -1175,
+
+  /** Classifier encountered invalid relocation. */
+  GXIO_MPIPE_ERR_CLASSIFIER_INVAL_RELOCATION = -1176,
+
+  /** Classifier encountered undefined symbol. */
+  GXIO_MPIPE_ERR_CLASSIFIER_UNDEF_SYMBOL = -1177,
+
+
+  /********************************************************/
+  /*                    TRIO  Error Codes                 */
+  /********************************************************/
+
+  /** Cannot allocate memory map region. */
+  GXIO_TRIO_ERR_NO_MEMORY_MAP = -1180,
+
+  /** Invalid memory map region number. */
+  GXIO_TRIO_ERR_BAD_MEMORY_MAP = -1181,
+
+  /** Cannot allocate scatter queue. */
+  GXIO_TRIO_ERR_NO_SCATTER_QUEUE = -1182,
+
+  /** Invalid scatter queue number. */
+  GXIO_TRIO_ERR_BAD_SCATTER_QUEUE = -1183,
+
+  /** Cannot allocate push DMA ring. */
+  GXIO_TRIO_ERR_NO_PUSH_DMA_RING = -1184,
+
+  /** Invalid push DMA ring index. */
+  GXIO_TRIO_ERR_BAD_PUSH_DMA_RING = -1185,
+
+  /** Cannot allocate pull DMA ring. */
+  GXIO_TRIO_ERR_NO_PULL_DMA_RING = -1186,
+
+  /** Invalid pull DMA ring index. */
+  GXIO_TRIO_ERR_BAD_PULL_DMA_RING = -1187,
+
+  /** Cannot allocate PIO region. */
+  GXIO_TRIO_ERR_NO_PIO = -1188,
+
+  /** Invalid PIO region index. */
+  GXIO_TRIO_ERR_BAD_PIO = -1189,
+
+  /** Cannot allocate ASID. */
+  GXIO_TRIO_ERR_NO_ASID = -1190,
+
+  /** Invalid ASID. */
+  GXIO_TRIO_ERR_BAD_ASID = -1191,
+
+
+  /********************************************************/
+  /*                    MICA Error Codes                  */
+  /********************************************************/
+
+  /** No such accelerator type. */
+  GXIO_MICA_ERR_BAD_ACCEL_TYPE = -1220,
+
+  /** Cannot allocate context. */
+  GXIO_MICA_ERR_NO_CONTEXT = -1221,
+
+  /** PKA command queue is full, can't add another command. */
+  GXIO_MICA_ERR_PKA_CMD_QUEUE_FULL = -1222,
+
+  /** PKA result queue is empty, can't get a result from the queue. */
+  GXIO_MICA_ERR_PKA_RESULT_QUEUE_EMPTY = -1223,
+
+  /********************************************************/
+  /*                    GPIO Error Codes                  */
+  /********************************************************/
+
+  /** Pin not available.  Either the physical pin does not exist, or
+   *  it is reserved by the hypervisor for system usage. */
+  GXIO_GPIO_ERR_PIN_UNAVAILABLE = -1240,
+
+  /** Pin busy.  The pin exists, and is available for use via GXIO, but
+   *  it has been attached by some other process or driver. */
+  GXIO_GPIO_ERR_PIN_BUSY = -1241,
+
+  /** Cannot access unattached pin.  One or more of the pins being
+   *  manipulated by this call are not attached to the requesting
+   *  context. */
+  GXIO_GPIO_ERR_PIN_UNATTACHED = -1242,
+
+  /** Invalid I/O mode for pin.  The wiring of the pin in the system
+   *  is such that the I/O mode or electrical control parameters
+   *  requested could cause damage. */
+  GXIO_GPIO_ERR_PIN_INVALID_MODE = -1243,
+
+  /** Smallest iorpc error number. */
+  GXIO_ERR_MIN = -1299
+};
+
+
+#endif /* !_HV_IORPC_H_ */

arch/tile/kernel/Makefile

···
 obj-$(CONFIG_MODULES)		+= module.o
 obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel_$(BITS).o
+ifdef CONFIG_TILEGX
+obj-$(CONFIG_PCI)		+= pci_gx.o
+else
 obj-$(CONFIG_PCI)		+= pci.o
+endif
+obj-$(CONFIG_TILE_USB)		+= usb.o

arch/tile/kernel/pci-dma.c

···
 
 #include <linux/mm.h>
 #include <linux/dma-mapping.h>
+#include <linux/swiotlb.h>
 #include <linux/vmalloc.h>
 #include <linux/export.h>
 #include <asm/tlbflush.h>
···
 /* Generic DMA mapping functions: */
 
 /*
- * Allocate what Linux calls "coherent" memory, which for us just
- * means uncached.
+ * Allocate what Linux calls "coherent" memory.  On TILEPro this is
+ * uncached memory; on TILE-Gx it is hash-for-home memory.
  */
-void *dma_alloc_coherent(struct device *dev,
-			 size_t size,
-			 dma_addr_t *dma_handle,
-			 gfp_t gfp)
+#ifdef __tilepro__
+#define PAGE_HOME_DMA PAGE_HOME_UNCACHED
+#else
+#define PAGE_HOME_DMA PAGE_HOME_HASH
+#endif
+
+static void *tile_dma_alloc_coherent(struct device *dev, size_t size,
+				     dma_addr_t *dma_handle, gfp_t gfp,
+				     struct dma_attrs *attrs)
 {
 	u64 dma_mask = dev->coherent_dma_mask ?: DMA_BIT_MASK(32);
 	int node = dev_to_node(dev);
···
 	gfp |= __GFP_ZERO;
 
 	/*
-	 * By forcing NUMA node 0 for 32-bit masks we ensure that the
-	 * high 32 bits of the resulting PA will be zero.  If the mask
-	 * size is, e.g., 24, we may still not be able to guarantee a
-	 * suitable memory address, in which case we will return NULL.
-	 * But such devices are uncommon.
+	 * If the mask specifies that the memory be in the first 4 GB, then
+	 * we force the allocation to come from the DMA zone.  We also
+	 * force the node to 0 since that's the only node where the DMA
+	 * zone isn't empty.  If the mask size is smaller than 32 bits, we
+	 * may still not be able to guarantee a suitable memory address, in
+	 * which case we will return NULL.  But such devices are uncommon.
 	 */
-	if (dma_mask <= DMA_BIT_MASK(32))
+	if (dma_mask <= DMA_BIT_MASK(32)) {
+		gfp |= GFP_DMA;
 		node = 0;
+	}
 
-	pg = homecache_alloc_pages_node(node, gfp, order, PAGE_HOME_UNCACHED);
+	pg = homecache_alloc_pages_node(node, gfp, order, PAGE_HOME_DMA);
 	if (pg == NULL)
 		return NULL;
 
 	addr = page_to_phys(pg);
 	if (addr + size > dma_mask) {
-		homecache_free_pages(addr, order);
+		__homecache_free_pages(pg, order);
 		return NULL;
 	}
 
 	*dma_handle = addr;
+
 	return page_address(pg);
 }
-EXPORT_SYMBOL(dma_alloc_coherent);
 
 /*
- * Free memory that was allocated with dma_alloc_coherent.
+ * Free memory that was allocated with tile_dma_alloc_coherent.
  */
-void dma_free_coherent(struct device *dev, size_t size,
-		  void *vaddr, dma_addr_t dma_handle)
+static void tile_dma_free_coherent(struct device *dev, size_t size,
+				   void *vaddr, dma_addr_t dma_handle,
+				   struct dma_attrs *attrs)
 {
 	homecache_free_pages((unsigned long)vaddr, get_order(size));
 }
-EXPORT_SYMBOL(dma_free_coherent);
 
 /*
  * The map routines "map" the specified address range for DMA
···
  * can count on nothing having been touched.
  */
 
-/* Flush a PA range from cache page by page. */
-static void __dma_map_pa_range(dma_addr_t dma_addr, size_t size)
+/* Set up a single page for DMA access. */
+static void __dma_prep_page(struct page *page, unsigned long offset,
+			    size_t size, enum dma_data_direction direction)
+{
+	/*
+	 * Flush the page from cache if necessary.
+	 * On tilegx, data is delivered to hash-for-home L3; on tilepro,
+	 * data is delivered direct to memory.
+	 *
+	 * NOTE: If we were just doing DMA_TO_DEVICE we could optimize
+	 * this to be a "flush" not a "finv" and keep some of the
+	 * state in cache across the DMA operation, but it doesn't seem
+	 * worth creating the necessary flush_buffer_xxx() infrastructure.
+	 */
+	int home = page_home(page);
+	switch (home) {
+	case PAGE_HOME_HASH:
+#ifdef __tilegx__
+		return;
+#endif
+		break;
+	case PAGE_HOME_UNCACHED:
+#ifdef __tilepro__
+		return;
+#endif
+		break;
+	case PAGE_HOME_IMMUTABLE:
+		/* Should be going to the device only. */
+		BUG_ON(direction == DMA_FROM_DEVICE ||
+		       direction == DMA_BIDIRECTIONAL);
+		return;
+	case PAGE_HOME_INCOHERENT:
+		/* Incoherent anyway, so no need to work hard here. */
+		return;
+	default:
+		BUG_ON(home < 0 || home >= NR_CPUS);
+		break;
+	}
+	homecache_finv_page(page);
+
+#ifdef DEBUG_ALIGNMENT
+	/* Warn if the region isn't cacheline aligned. */
+	if (offset & (L2_CACHE_BYTES - 1) || (size & (L2_CACHE_BYTES - 1)))
+		pr_warn("Unaligned DMA to non-hfh memory: PA %#llx/%#lx\n",
+			PFN_PHYS(page_to_pfn(page)) + offset, size);
+#endif
+}
+
+/* Make the page ready to be read by the core. */
+static void __dma_complete_page(struct page *page, unsigned long offset,
+				size_t size, enum dma_data_direction direction)
+{
+#ifdef __tilegx__
+	switch (page_home(page)) {
+	case PAGE_HOME_HASH:
+		/* I/O device delivered data the way the cpu wanted it. */
+		break;
+	case PAGE_HOME_INCOHERENT:
+		/* Incoherent anyway, so no need to work hard here. */
+		break;
+	case PAGE_HOME_IMMUTABLE:
+		/* Extra read-only copies are not a problem. */
+		break;
+	default:
+		/* Flush the bogus hash-for-home I/O entries to memory. */
+		homecache_finv_map_page(page, PAGE_HOME_HASH);
+		break;
+	}
+#endif
+}
+
+static void __dma_prep_pa_range(dma_addr_t dma_addr, size_t size,
+				enum dma_data_direction direction)
 {
 	struct page *page = pfn_to_page(PFN_DOWN(dma_addr));
-	size_t bytesleft = PAGE_SIZE - (dma_addr & (PAGE_SIZE - 1));
+	unsigned long offset = dma_addr & (PAGE_SIZE - 1);
+	size_t bytes = min(size, (size_t)(PAGE_SIZE - offset));
 
-	while ((ssize_t)size > 0) {
-		/* Flush the page. */
-		homecache_flush_cache(page++, 0);
-
-		/* Figure out if we need to continue on the next page. */
-		size -= bytesleft;
-		bytesleft = PAGE_SIZE;
+	while (size != 0) {
+		__dma_prep_page(page, offset, bytes, direction);
+		size -= bytes;
+		++page;
+		offset = 0;
+		bytes = min((size_t)PAGE_SIZE, size);
 	}
 }
 
-/*
- * dma_map_single can be passed any memory address, and there appear
- * to be no alignment constraints.
- *
- * There is a chance that the start of the buffer will share a cache
- * line with some other data that has been touched in the meantime.
- */
-dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
-	       enum dma_data_direction direction)
+static void __dma_complete_pa_range(dma_addr_t dma_addr, size_t size,
+				    enum dma_data_direction direction)
 {
-	dma_addr_t dma_addr = __pa(ptr);
+	struct page *page = pfn_to_page(PFN_DOWN(dma_addr));
+	unsigned long offset = dma_addr & (PAGE_SIZE - 1);
+	size_t bytes = min(size, (size_t)(PAGE_SIZE - offset));
 
-	BUG_ON(!valid_dma_direction(direction));
-	WARN_ON(size == 0);
-
-	__dma_map_pa_range(dma_addr, size);
-
-	return dma_addr;
+	while (size != 0) {
+		__dma_complete_page(page, offset, bytes, direction);
+		size -= bytes;
+		++page;
+		offset = 0;
+		bytes = min((size_t)PAGE_SIZE, size);
+	}
 }
-EXPORT_SYMBOL(dma_map_single);
 
-void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
-		 enum dma_data_direction direction)
-{
-	BUG_ON(!valid_dma_direction(direction));
-}
-EXPORT_SYMBOL(dma_unmap_single);
-
-int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
-	   enum dma_data_direction direction)
+static int tile_dma_map_sg(struct device *dev, struct scatterlist *sglist,
+			   int nents, enum dma_data_direction direction,
+			   struct dma_attrs *attrs)
 {
 	struct scatterlist *sg;
 	int i;
···
 
 	for_each_sg(sglist, sg, nents, i) {
 		sg->dma_address = sg_phys(sg);
-		__dma_map_pa_range(sg->dma_address, sg->length);
+		__dma_prep_pa_range(sg->dma_address, sg->length, direction);
+#ifdef CONFIG_NEED_SG_DMA_LENGTH
+		sg->dma_length = sg->length;
+#endif
 	}
 
 	return nents;
 }
-EXPORT_SYMBOL(dma_map_sg);
 
-void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
-	     enum dma_data_direction direction)
+static void tile_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
+			      int nents, enum dma_data_direction direction,
+			      struct dma_attrs *attrs)
 {
-	BUG_ON(!valid_dma_direction(direction));
-}
-EXPORT_SYMBOL(dma_unmap_sg);
+	struct scatterlist *sg;
+	int i;
 
-dma_addr_t dma_map_page(struct device *dev, struct page *page,
-			unsigned long offset, size_t size,
-			enum dma_data_direction direction)
+	BUG_ON(!valid_dma_direction(direction));
+	for_each_sg(sglist, sg, nents, i) {
+		sg->dma_address = sg_phys(sg);
+		__dma_complete_pa_range(sg->dma_address, sg->length,
+					direction);
+	}
+}
+
+static dma_addr_t tile_dma_map_page(struct device *dev, struct page *page,
+				    unsigned long offset, size_t size,
+				    enum dma_data_direction direction,
+				    struct dma_attrs *attrs)
 {
 	BUG_ON(!valid_dma_direction(direction));
 
 	BUG_ON(offset + size > PAGE_SIZE);
-	homecache_flush_cache(page, 0);
+	__dma_prep_page(page, offset, size, direction);
 
 	return page_to_pa(page) + offset;
 }
-EXPORT_SYMBOL(dma_map_page);
 
-void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
-	       enum dma_data_direction direction)
+static void tile_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
+				size_t size, enum dma_data_direction direction,
+				struct dma_attrs *attrs)
 {
 	BUG_ON(!valid_dma_direction(direction));
-}
-EXPORT_SYMBOL(dma_unmap_page);
 
-void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
-			     size_t size, enum dma_data_direction direction)
+	__dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
+			    dma_address & PAGE_OFFSET, size, direction);
+}
+
+static void tile_dma_sync_single_for_cpu(struct device *dev,
+					 dma_addr_t dma_handle,
+					 size_t size,
+					 enum dma_data_direction direction)
 {
 	BUG_ON(!valid_dma_direction(direction));
-}
-EXPORT_SYMBOL(dma_sync_single_for_cpu);
 
-void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
-				size_t size, enum dma_data_direction direction)
+	__dma_complete_pa_range(dma_handle, size, direction);
+}
+
+static void tile_dma_sync_single_for_device(struct device *dev,
+					    dma_addr_t dma_handle, size_t size,
+					    enum dma_data_direction direction)
 {
-	unsigned long start = PFN_DOWN(dma_handle);
-	unsigned long end = PFN_DOWN(dma_handle + size - 1);
-	unsigned long i;
+	__dma_prep_pa_range(dma_handle, size, direction);
+}
+
+static void tile_dma_sync_sg_for_cpu(struct device *dev,
+				     struct scatterlist *sglist, int nelems,
+				     enum dma_data_direction direction)
+{
+	struct scatterlist *sg;
+	int i;
 
 	BUG_ON(!valid_dma_direction(direction));
-	for (i = start; i <= end; ++i)
-		homecache_flush_cache(pfn_to_page(i), 0);
-}
-EXPORT_SYMBOL(dma_sync_single_for_device);
+	WARN_ON(nelems == 0 || sglist->length == 0);
 
-void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
-		    enum dma_data_direction direction)
-{
-	BUG_ON(!valid_dma_direction(direction));
-	WARN_ON(nelems == 0 || sg[0].length == 0);
+	for_each_sg(sglist, sg, nelems, i) {
+		dma_sync_single_for_cpu(dev, sg->dma_address,
+					sg_dma_len(sg), direction);
+	}
 }
-EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 
-/*
- * Flush and invalidate cache for scatterlist.
- */
-void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
-			    int nelems, enum dma_data_direction direction)
+static void tile_dma_sync_sg_for_device(struct device *dev,
+					struct scatterlist *sglist, int nelems,
+					enum dma_data_direction direction)
 {
 	struct scatterlist *sg;
 	int i;
···
 					   sg_dma_len(sg), direction);
 	}
 }
-EXPORT_SYMBOL(dma_sync_sg_for_device);
 
-void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
-				   unsigned long offset, size_t size,
-				   enum dma_data_direction direction)
+static inline int
+tile_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
-	dma_sync_single_for_cpu(dev, dma_handle + offset, size, direction);
+	return 0;
 }
-EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 
-void dma_sync_single_range_for_device(struct device *dev,
-				      dma_addr_t dma_handle,
-				      unsigned long offset, size_t size,
-				      enum dma_data_direction direction)
+static inline int
+tile_dma_supported(struct device *dev, u64 mask)
 {
-	dma_sync_single_for_device(dev, dma_handle + offset, size, direction);
+	return 1;
 }
-EXPORT_SYMBOL(dma_sync_single_range_for_device);
+
+static struct dma_map_ops tile_default_dma_map_ops = {
+	.alloc = tile_dma_alloc_coherent,
+	.free = tile_dma_free_coherent,
+	.map_page = tile_dma_map_page,
+	.unmap_page = tile_dma_unmap_page,
+	.map_sg = tile_dma_map_sg,
+	.unmap_sg = tile_dma_unmap_sg,
+	.sync_single_for_cpu = tile_dma_sync_single_for_cpu,
+	.sync_single_for_device = tile_dma_sync_single_for_device,
+	.sync_sg_for_cpu = tile_dma_sync_sg_for_cpu,
+	.sync_sg_for_device = tile_dma_sync_sg_for_device,
+	.mapping_error = tile_dma_mapping_error,
+	.dma_supported = tile_dma_supported
+};
+
+struct dma_map_ops *tile_dma_map_ops = &tile_default_dma_map_ops;
+EXPORT_SYMBOL(tile_dma_map_ops);
+
+/* Generic PCI DMA mapping functions */
+
+static void *tile_pci_dma_alloc_coherent(struct device *dev, size_t size,
+					 dma_addr_t *dma_handle, gfp_t gfp,
+					 struct dma_attrs *attrs)
+{
+	int node = dev_to_node(dev);
+	int order = get_order(size);
+	struct page *pg;
+	dma_addr_t addr;
+
+	gfp |= __GFP_ZERO;
+
+	pg = homecache_alloc_pages_node(node, gfp, order, PAGE_HOME_DMA);
+	if (pg == NULL)
+		return NULL;
+
+	addr = page_to_phys(pg);
+
+	*dma_handle = phys_to_dma(dev, addr);
+
+	return page_address(pg);
+}
 
 /*
- * dma_alloc_noncoherent() returns non-cacheable memory, so there's no
- * need to do any flushing here.
+ * Free memory that was allocated with tile_pci_dma_alloc_coherent.
  */
-void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
-		    enum dma_data_direction direction)
+static void tile_pci_dma_free_coherent(struct device *dev, size_t size,
+				       void *vaddr, dma_addr_t dma_handle,
+				       struct dma_attrs *attrs)
 {
+	homecache_free_pages((unsigned long)vaddr, get_order(size));
 }
-EXPORT_SYMBOL(dma_cache_sync);
+
+static int tile_pci_dma_map_sg(struct device *dev, struct scatterlist *sglist,
+			       int nents, enum dma_data_direction direction,
+			       struct dma_attrs *attrs)
+{
+	struct scatterlist *sg;
+	int i;
+
+	BUG_ON(!valid_dma_direction(direction));
+
+	WARN_ON(nents == 0 || sglist->length == 0);
+
+	for_each_sg(sglist, sg, nents, i) {
+		sg->dma_address = sg_phys(sg);
+		__dma_prep_pa_range(sg->dma_address, sg->length, direction);
+
+		sg->dma_address = phys_to_dma(dev, sg->dma_address);
+#ifdef CONFIG_NEED_SG_DMA_LENGTH
+		sg->dma_length = sg->length;
+#endif
+	}
+
+	return nents;
+}
+
+static void tile_pci_dma_unmap_sg(struct device *dev,
+				  struct scatterlist *sglist, int nents,
+				  enum dma_data_direction direction,
+				  struct dma_attrs *attrs)
+{
+	struct scatterlist *sg;
+	int i;
+
+	BUG_ON(!valid_dma_direction(direction));
+	for_each_sg(sglist, sg, nents, i) {
+		sg->dma_address = sg_phys(sg);
+		__dma_complete_pa_range(sg->dma_address, sg->length,
+					direction);
+	}
+}
+
+static dma_addr_t tile_pci_dma_map_page(struct device *dev, struct page *page,
+					unsigned long offset, size_t size,
+					enum dma_data_direction direction,
+					struct dma_attrs *attrs)
+{
+	BUG_ON(!valid_dma_direction(direction));
+
+	BUG_ON(offset + size > PAGE_SIZE);
+	__dma_prep_page(page, offset, size, direction);
+
+	return phys_to_dma(dev, page_to_pa(page) + offset);
+}
+
+static void tile_pci_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
+				    size_t size,
+				    enum dma_data_direction direction,
+				    struct dma_attrs *attrs)
+{
+	BUG_ON(!valid_dma_direction(direction));
+
+	dma_address = dma_to_phys(dev, dma_address);
+
+	__dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
+			    dma_address & PAGE_OFFSET, size, direction);
+}
+
+static void tile_pci_dma_sync_single_for_cpu(struct device *dev,
+					     dma_addr_t dma_handle,
+					     size_t size,
+					     enum dma_data_direction direction)
+{
+	BUG_ON(!valid_dma_direction(direction));
+
+	dma_handle = dma_to_phys(dev, dma_handle);
+
+	__dma_complete_pa_range(dma_handle, size, direction);
+}
+
+static void tile_pci_dma_sync_single_for_device(struct device *dev,
+						dma_addr_t dma_handle,
+						size_t size,
+						enum dma_data_direction
+						direction)
+{
+	dma_handle = dma_to_phys(dev, dma_handle);
+
+	__dma_prep_pa_range(dma_handle, size, direction);
+}
+
+static void tile_pci_dma_sync_sg_for_cpu(struct device *dev,
+					 struct scatterlist *sglist,
+					 int nelems,
+					 enum dma_data_direction direction)
+{
+	struct scatterlist *sg;
+	int i;
+
+	BUG_ON(!valid_dma_direction(direction));
+	WARN_ON(nelems == 0 || sglist->length == 0);
+
+	for_each_sg(sglist, sg, nelems, i) {
+		dma_sync_single_for_cpu(dev, sg->dma_address,
+					sg_dma_len(sg), direction);
+	}
+}
+
+static void tile_pci_dma_sync_sg_for_device(struct device *dev,
+					    struct scatterlist *sglist,
+					    int nelems,
+					    enum dma_data_direction direction)
+{
+	struct scatterlist *sg;
+	int i;
+
+	BUG_ON(!valid_dma_direction(direction));
+	WARN_ON(nelems == 0 || sglist->length == 0);
+
+	for_each_sg(sglist, sg, nelems, i) {
+		dma_sync_single_for_device(dev, sg->dma_address,
+					   sg_dma_len(sg), direction);
+	}
+}
+
+static inline int
+tile_pci_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+	return 0;
+}
+
+static inline int
+tile_pci_dma_supported(struct device *dev, u64 mask)
+{
+	return 1;
+}
+
+static struct dma_map_ops tile_pci_default_dma_map_ops = {
+	.alloc = tile_pci_dma_alloc_coherent,
+	.free = tile_pci_dma_free_coherent,
+	.map_page = tile_pci_dma_map_page,
+	.unmap_page = tile_pci_dma_unmap_page,
+	.map_sg = tile_pci_dma_map_sg,
+	.unmap_sg = tile_pci_dma_unmap_sg,
+	.sync_single_for_cpu = tile_pci_dma_sync_single_for_cpu,
+	.sync_single_for_device = tile_pci_dma_sync_single_for_device,
+	.sync_sg_for_cpu = tile_pci_dma_sync_sg_for_cpu,
+	.sync_sg_for_device = tile_pci_dma_sync_sg_for_device,
+	.mapping_error = tile_pci_dma_mapping_error,
+	.dma_supported = tile_pci_dma_supported
+};
+
+struct dma_map_ops *gx_pci_dma_map_ops = &tile_pci_default_dma_map_ops;
+EXPORT_SYMBOL(gx_pci_dma_map_ops);
+
+/* PCI DMA mapping functions for legacy PCI devices */
+
+#ifdef CONFIG_SWIOTLB
+static void *tile_swiotlb_alloc_coherent(struct device *dev, size_t size,
+					 dma_addr_t *dma_handle, gfp_t gfp,
+					 struct dma_attrs *attrs)
+{
+	gfp |= GFP_DMA;
+	return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
+}
+
+static void tile_swiotlb_free_coherent(struct device *dev, size_t size,
+				       void *vaddr, dma_addr_t dma_addr,
+				       struct dma_attrs *attrs)
+{
+	swiotlb_free_coherent(dev, size, vaddr, dma_addr);
+}
+
+static struct dma_map_ops pci_swiotlb_dma_ops = {
+	.alloc = tile_swiotlb_alloc_coherent,
+	.free = tile_swiotlb_free_coherent,
+	.map_page = swiotlb_map_page,
+	.unmap_page = swiotlb_unmap_page,
+	.map_sg = swiotlb_map_sg_attrs,
+	.unmap_sg = swiotlb_unmap_sg_attrs,
+	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
+	.sync_single_for_device = swiotlb_sync_single_for_device,
+	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
+	.sync_sg_for_device = swiotlb_sync_sg_for_device,
+	.dma_supported = swiotlb_dma_supported,
+	.mapping_error = swiotlb_dma_mapping_error,
+};
+
+struct dma_map_ops *gx_legacy_pci_dma_map_ops = &pci_swiotlb_dma_ops;
+#else
+struct dma_map_ops *gx_legacy_pci_dma_map_ops;
+#endif
+EXPORT_SYMBOL(gx_legacy_pci_dma_map_ops);
+
+#ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
+int dma_set_coherent_mask(struct device *dev, u64 mask)
+{
+	struct dma_map_ops *dma_ops = get_dma_ops(dev);
+
+	/* Handle legacy PCI devices with limited memory addressability. */
+	if (((dma_ops == gx_pci_dma_map_ops) ||
+	    (dma_ops == gx_legacy_pci_dma_map_ops)) &&
+	    (mask <= DMA_BIT_MASK(32))) {
+		if (mask > dev->archdata.max_direct_dma_addr)
+			mask = dev->archdata.max_direct_dma_addr;
+	}
+
+	if (!dma_supported(dev, mask))
+		return -EIO;
+	dev->coherent_dma_mask = mask;
+	return 0;
+}
+EXPORT_SYMBOL(dma_set_coherent_mask);
+#endif

arch/tile/kernel/pci_gx.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mmzone.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/capability.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/irq.h>
+#include <linux/msi.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/ctype.h>
+
+#include <asm/processor.h>
+#include <asm/sections.h>
+#include <asm/byteorder.h>
+
+#include <gxio/iorpc_globals.h>
+#include <gxio/kiorpc.h>
+#include <gxio/trio.h>
+#include <gxio/iorpc_trio.h>
+#include <hv/drv_trio_intf.h>
+
+#include <arch/sim.h>
+
+/*
+ * This file containes the routines to search for PCI buses,
+ * enumerate the buses, and configure any attached devices.
+ */
+
+#define DEBUG_PCI_CFG	0
+
+#if DEBUG_PCI_CFG
+#define TRACE_CFG_WR(size, val, bus, dev, func, offset) \
+	pr_info("CFG WR %d-byte VAL %#x to bus %d dev %d func %d addr %u\n", \
+		size, val, bus, dev, func, offset & 0xFFF);
+#define TRACE_CFG_RD(size, val, bus, dev, func, offset) \
+	pr_info("CFG RD %d-byte VAL %#x from bus %d dev %d func %d addr %u\n", \
+		size, val, bus, dev, func, offset & 0xFFF);
+#else
+#define TRACE_CFG_WR(...)
+#define TRACE_CFG_RD(...)
+#endif
+
+static int __devinitdata pci_probe = 1;
+
+/* Information on the PCIe RC ports configuration. */
+static int __devinitdata pcie_rc[TILEGX_NUM_TRIO][TILEGX_TRIO_PCIES];
+
+/*
+ * On some platforms with one or more Gx endpoint ports, we need to
+ * delay the PCIe RC port probe for a few seconds to work around
+ * a HW PCIe link-training bug. The exact delay is specified with
+ * a kernel boot argument in the form of "pcie_rc_delay=T,P,S",
+ * where T is the TRIO instance number, P is the port number and S is
+ * the delay in seconds. If the delay is not provided, the value
+ * will be DEFAULT_RC_DELAY.
+ */
+static int __devinitdata rc_delay[TILEGX_NUM_TRIO][TILEGX_TRIO_PCIES];
+
+/* Default number of seconds that the PCIe RC port probe can be delayed. */
+#define DEFAULT_RC_DELAY	10
+
+/* Max number of seconds that the PCIe RC port probe can be delayed. */
+#define MAX_RC_DELAY		20
+
+/* Array of the PCIe ports configuration info obtained from the BIB. */
+struct pcie_port_property pcie_ports[TILEGX_NUM_TRIO][TILEGX_TRIO_PCIES];
+
+/* All drivers share the TRIO contexts defined here. */
+gxio_trio_context_t trio_contexts[TILEGX_NUM_TRIO];
+
+/* Pointer to an array of PCIe RC controllers. */
+struct pci_controller pci_controllers[TILEGX_NUM_TRIO * TILEGX_TRIO_PCIES];
+int num_rc_controllers;
+static int num_ep_controllers;
+
+static struct pci_ops tile_cfg_ops;
+
+/* Mask of CPUs that should receive PCIe interrupts. */
+static struct cpumask intr_cpus_map;
+
+/*
+ * We don't need to worry about the alignment of resources.
+ */
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+				resource_size_t size, resource_size_t align)
+{
+	return res->start;
+}
+EXPORT_SYMBOL(pcibios_align_resource);
+
+
+/*
+ * Pick a CPU to receive and handle the PCIe interrupts, based on the IRQ #.
+ * For now, we simply send interrupts to non-dataplane CPUs.
+ * We may implement methods to allow user to specify the target CPUs,
+ * e.g. via boot arguments.
+ */
+static int tile_irq_cpu(int irq)
+{
+	unsigned int count;
+	int i = 0;
+	int cpu;
+
+	count = cpumask_weight(&intr_cpus_map);
+	if (unlikely(count == 0)) {
+		pr_warning("intr_cpus_map empty, interrupts will be"
+			   " delievered to dataplane tiles\n");
+		return irq % (smp_height * smp_width);
+	}
+
+	count = irq % count;
+	for_each_cpu(cpu, &intr_cpus_map) {
+		if (i++ == count)
+			break;
+	}
+	return cpu;
+}
+
+/*
+ * Open a file descriptor to the TRIO shim.
+ */
+static int __devinit tile_pcie_open(int trio_index)
+{
+	gxio_trio_context_t *context = &trio_contexts[trio_index];
+	int ret;
+
+	/*
+	 * This opens a file descriptor to the TRIO shim.
+	 */
+	ret = gxio_trio_init(context, trio_index);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Allocate an ASID for the kernel.
+	 */
+	ret = gxio_trio_alloc_asids(context, 1, 0, 0);
+	if (ret < 0) {
+		pr_err("PCI: ASID alloc failure on TRIO %d, give up\n",
+			trio_index);
+		goto asid_alloc_failure;
+	}
+
+	context->asid = ret;
+
+#ifdef USE_SHARED_PCIE_CONFIG_REGION
+	/*
+	 * Alloc a PIO region for config access, shared by all MACs per TRIO.
+	 * This shouldn't fail since the kernel is supposed to the first
+	 * client of the TRIO's PIO regions.
+	 */
+	ret = gxio_trio_alloc_pio_regions(context, 1, 0, 0);
+	if (ret < 0) {
+		pr_err("PCI: CFG PIO alloc failure on TRIO %d, give up\n",
+			trio_index);
+		goto pio_alloc_failure;
+	}
+
+	context->pio_cfg_index = ret;
+
+	/*
+	 * For PIO CFG, the bus_address_hi parameter is 0. The mac parameter
+	 * is also 0 because it is specified in PIO_REGION_SETUP_CFG_ADDR.
+	 */
+	ret = gxio_trio_init_pio_region_aux(context, context->pio_cfg_index,
+		0, 0, HV_TRIO_PIO_FLAG_CONFIG_SPACE);
+	if (ret < 0) {
+		pr_err("PCI: CFG PIO init failure on TRIO %d, give up\n",
+			trio_index);
+		goto pio_alloc_failure;
+	}
+#endif
+
+	return ret;
+
+asid_alloc_failure:
+#ifdef USE_SHARED_PCIE_CONFIG_REGION
+pio_alloc_failure:
+#endif
+	hv_dev_close(context->fd);
+
+	return ret;
+}
+
+static void
+tilegx_legacy_irq_ack(struct irq_data *d)
+{
+	__insn_mtspr(SPR_IPI_EVENT_RESET_K, 1UL << d->irq);
+}
+
+static void
+tilegx_legacy_irq_mask(struct irq_data *d)
+{
+	__insn_mtspr(SPR_IPI_MASK_SET_K, 1UL << d->irq);
+}
+
+static void
+tilegx_legacy_irq_unmask(struct irq_data *d)
+{
+	__insn_mtspr(SPR_IPI_MASK_RESET_K, 1UL << d->irq);
+}
+
+static struct irq_chip tilegx_legacy_irq_chip = {
+	.name			= "tilegx_legacy_irq",
+	.irq_ack		= tilegx_legacy_irq_ack,
+	.irq_mask		= tilegx_legacy_irq_mask,
+	.irq_unmask		= tilegx_legacy_irq_unmask,
+
+	/* TBD: support set_affinity. */
+};
+
+/*
+ * This is a wrapper function of the kernel level-trigger interrupt
+ * handler handle_level_irq() for PCI legacy interrupts. The TRIO
+ * is configured such that only INTx Assert interrupts are proxied
+ * to Linux which just calls handle_level_irq() after clearing the
+ * MAC INTx Assert status bit associated with this interrupt.
+ */
+static void
+trio_handle_level_irq(unsigned int irq, struct irq_desc *desc)
+{
+	struct pci_controller *controller = irq_desc_get_handler_data(desc);
+	gxio_trio_context_t *trio_context = controller->trio;
+	uint64_t intx = (uint64_t)irq_desc_get_chip_data(desc);
+	int mac = controller->mac;
+	unsigned int reg_offset;
+	uint64_t level_mask;
+
+	handle_level_irq(irq, desc);
+
+	/*
+	 * Clear the INTx Level status, otherwise future interrupts are
+	 * not sent.
+	 */
+	reg_offset = (TRIO_PCIE_INTFC_MAC_INT_STS <<
+		TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+		(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
+		TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+		(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+	level_mask = TRIO_PCIE_INTFC_MAC_INT_STS__INT_LEVEL_MASK << intx;
+
+	__gxio_mmio_write(trio_context->mmio_base_mac + reg_offset, level_mask);
+}
+
+/*
+ * Create kernel irqs and set up the handlers for the legacy interrupts.
+ * Also some minimum initialization for the MSI support.
+ */
+static int __devinit tile_init_irqs(struct pci_controller *controller)
+{
+	int i;
+	int j;
+	int irq;
+	int result;
+
+	cpumask_copy(&intr_cpus_map, cpu_online_mask);
+
+
+	for (i = 0; i < 4; i++) {
+		gxio_trio_context_t *context = controller->trio;
+		int cpu;
+
+		/* Ask the kernel to allocate an IRQ. */
+		irq = create_irq();
+		if (irq < 0) {
+			pr_err("PCI: no free irq vectors, failed for %d\n", i);
+
+			goto free_irqs;
+		}
+		controller->irq_intx_table[i] = irq;
+
+		/* Distribute the 4 IRQs to different tiles. */
+		cpu = tile_irq_cpu(irq);
+
+		/* Configure the TRIO intr binding for this IRQ. */
+		result = gxio_trio_config_legacy_intr(context, cpu_x(cpu),
+						      cpu_y(cpu), KERNEL_PL,
+						      irq, controller->mac, i);
+		if (result < 0) {
+			pr_err("PCI: MAC intx config failed for %d\n", i);
+
+			goto free_irqs;
+		}
+
+		/*
+		 * Register the IRQ handler with the kernel.
+		 */
+		irq_set_chip_and_handler(irq, &tilegx_legacy_irq_chip,
+					trio_handle_level_irq);
+		irq_set_chip_data(irq, (void *)(uint64_t)i);
+		irq_set_handler_data(irq, controller);
+	}
+
+	return 0;
+
+free_irqs:
+	for (j = 0; j < i; j++)
+		destroy_irq(controller->irq_intx_table[j]);
+
+	return -1;
+}
+
+/*
+ * Find valid controllers and fill in pci_controller structs for each
+ * of them.
+ *
+ * Returns the number of controllers discovered.
+ */
+int __init tile_pci_init(void)
+{
+	int num_trio_shims = 0;
+	int ctl_index = 0;
+	int i, j;
+
+	if (!pci_probe) {
+		pr_info("PCI: disabled by boot argument\n");
+		return 0;
+	}
+
+	pr_info("PCI: Searching for controllers...\n");
+
+	/*
+	 * We loop over all the TRIO shims.
+	 */
+	for (i = 0; i < TILEGX_NUM_TRIO; i++) {
+		int ret;
+
+		ret = tile_pcie_open(i);
+		if (ret < 0)
+			continue;
+
+		num_trio_shims++;
+	}
+
+	if (num_trio_shims == 0 || sim_is_simulator())
+		return 0;
+
+	/*
+	 * Now determine which PCIe ports are configured to operate in RC mode.
+	 * We look at the Board Information Block first and then see if there
+	 * are any overriding configuration by the HW strapping pin.
+	 */
+	for (i = 0; i < TILEGX_NUM_TRIO; i++) {
+		gxio_trio_context_t *context = &trio_contexts[i];
+		int ret;
+
+		if (context->fd < 0)
+			continue;
+
+		ret = hv_dev_pread(context->fd, 0,
+			(HV_VirtAddr)&pcie_ports[i][0],
+			sizeof(struct pcie_port_property) * TILEGX_TRIO_PCIES,
+			GXIO_TRIO_OP_GET_PORT_PROPERTY);
+		if (ret < 0) {
+			pr_err("PCI: PCIE_GET_PORT_PROPERTY failure, error %d,"
+				" on TRIO %d\n", ret, i);
+			continue;
+		}
+
+		for (j = 0; j < TILEGX_TRIO_PCIES; j++) {
+			if (pcie_ports[i][j].allow_rc) {
+				pcie_rc[i][j] = 1;
+				num_rc_controllers++;
+			}
+			else if (pcie_ports[i][j].allow_ep) {
+				num_ep_controllers++;
+			}
+		}
+	}
+
+	/*
+	 * Return if no PCIe ports are configured to operate in RC mode.
+	 */
+	if (num_rc_controllers == 0)
+		return 0;
+
+	/*
+	 * Set the TRIO pointer and MAC index for each PCIe RC port.
+	 */
+	for (i = 0; i < TILEGX_NUM_TRIO; i++) {
+		for (j = 0; j < TILEGX_TRIO_PCIES; j++) {
+			if (pcie_rc[i][j]) {
+				pci_controllers[ctl_index].trio =
+					&trio_contexts[i];
+				pci_controllers[ctl_index].mac = j;
+				pci_controllers[ctl_index].trio_index = i;
+				ctl_index++;
+				if (ctl_index == num_rc_controllers)
+					goto out;
+			}
+		}
+	}
+
+out:
+	/*
+	 * Configure each PCIe RC port.
+	 */
+	for (i = 0; i < num_rc_controllers; i++) {
+		/*
+		 * Configure the PCIe MAC to run in RC mode.
+		 */
+
+		struct pci_controller *controller = &pci_controllers[i];
+
+		controller->index = i;
+		controller->ops = &tile_cfg_ops;
+
+		/*
+		 * The PCI memory resource is located above the PA space.
+		 * For every host bridge, the BAR window or the MMIO aperture
+		 * is in range [3GB, 4GB - 1] of a 4GB space beyond the
+		 * PA space.
+		 */
+
+		controller->mem_offset = TILE_PCI_MEM_START +
+			(i * TILE_PCI_BAR_WINDOW_TOP);
+		controller->mem_space.start = controller->mem_offset +
+			TILE_PCI_BAR_WINDOW_TOP - TILE_PCI_BAR_WINDOW_SIZE;
+		controller->mem_space.end = controller->mem_offset +
+			TILE_PCI_BAR_WINDOW_TOP - 1;
+		controller->mem_space.flags = IORESOURCE_MEM;
+		snprintf(controller->mem_space_name,
+			 sizeof(controller->mem_space_name),
+			 "PCI mem domain %d", i);
+		controller->mem_space.name = controller->mem_space_name;
+	}
+
+	return num_rc_controllers;
+}
+
+/*
+ * (pin - 1) converts from the PCI standard's [1:4] convention to
+ * a normal [0:3] range.
+ */
+static int tile_map_irq(const struct pci_dev *dev, u8 device, u8 pin)
+{
+	struct pci_controller *controller =
+		(struct pci_controller *)dev->sysdata;
+	return controller->irq_intx_table[pin - 1];
+}
+
+
+static void __devinit fixup_read_and_payload_sizes(struct pci_controller *
+						controller)
+{
+	gxio_trio_context_t *trio_context = controller->trio;
+	struct pci_bus *root_bus = controller->root_bus;
+	TRIO_PCIE_RC_DEVICE_CONTROL_t dev_control;
+	TRIO_PCIE_RC_DEVICE_CAP_t rc_dev_cap;
+	unsigned int reg_offset;
+	struct pci_bus *child;
+	int mac;
+	int err;
+
+	mac = controller->mac;
+
+	/*
+	 * Set our max read request size to be 4KB.
+	 */
+	reg_offset =
+		(TRIO_PCIE_RC_DEVICE_CONTROL <<
+			TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+		(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
+			TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+		(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+	dev_control.word = __gxio_mmio_read32(trio_context->mmio_base_mac +
+						reg_offset);
+	dev_control.max_read_req_sz = 5;
+	__gxio_mmio_write32(trio_context->mmio_base_mac + reg_offset,
+						dev_control.word);
+
+	/*
+	 * Set the max payload size supported by this Gx PCIe MAC.
+	 * Though Gx PCIe supports Max Payload Size of up to 1024 bytes,
+	 * experiments have shown that setting MPS to 256 yields the
+	 * best performance.
+	 */
+	reg_offset =
+		(TRIO_PCIE_RC_DEVICE_CAP <<
+			TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+		(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
+			TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+		(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+	rc_dev_cap.word = __gxio_mmio_read32(trio_context->mmio_base_mac +
+						reg_offset);
+	rc_dev_cap.mps_sup = 1;
+	__gxio_mmio_write32(trio_context->mmio_base_mac + reg_offset,
+						rc_dev_cap.word);
+
+	/* Configure PCI Express MPS setting. */
+	list_for_each_entry(child, &root_bus->children, node) {
+		struct pci_dev *self = child->self;
+		if (!self)
+			continue;
+
+		pcie_bus_configure_settings(child, self->pcie_mpss);
+	}
+
+	/*
+	 * Set the mac_config register in trio based on the MPS/MRS of the link.
+	 */
+	reg_offset =
+		(TRIO_PCIE_RC_DEVICE_CONTROL <<
+			TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+		(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
+			TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+		(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+	dev_control.word = __gxio_mmio_read32(trio_context->mmio_base_mac +
+						reg_offset);
+
+	err = gxio_trio_set_mps_mrs(trio_context,
+				    dev_control.max_payload_size,
+				    dev_control.max_read_req_sz,
+				    mac);
+        if (err < 0) {
+		pr_err("PCI: PCIE_CONFIGURE_MAC_MPS_MRS failure, "
+			"MAC %d on TRIO %d\n",
+			mac, controller->trio_index);
+	}
+}
+
+static int __devinit setup_pcie_rc_delay(char *str)
+{
+	unsigned long delay = 0;
+	unsigned long trio_index;
+	unsigned long mac;
+
+	if (str == NULL || !isdigit(*str))
+		return -EINVAL;
+	trio_index = simple_strtoul(str, (char **)&str, 10);
+	if (trio_index >= TILEGX_NUM_TRIO)
+		return -EINVAL;
+
+	if (*str != ',')
+		return -EINVAL;
+
+	str++;
+	if (!isdigit(*str))
+		return -EINVAL;
+	mac = simple_strtoul(str, (char **)&str, 10);
+	if (mac >= TILEGX_TRIO_PCIES)
+		return -EINVAL;
+
+	if (*str != '\0') {
+		if (*str != ',')
+			return -EINVAL;
+
+		str++;
+		if (!isdigit(*str))
+			return -EINVAL;
+		delay = simple_strtoul(str, (char **)&str, 10);
+		if (delay > MAX_RC_DELAY)
+			return -EINVAL;
+	}
+
+	rc_delay[trio_index][mac] = delay ? : DEFAULT_RC_DELAY;
+	pr_info("Delaying PCIe RC link training for %u sec"
+		" on MAC %lu on TRIO %lu\n", rc_delay[trio_index][mac],
+		mac, trio_index);
+	return 0;
+}
+early_param("pcie_rc_delay", setup_pcie_rc_delay);
+
+/*
+ * PCI initialization entry point, called by subsys_initcall.
+ */
+int __init pcibios_init(void)
+{
+	resource_size_t offset;
+	LIST_HEAD(resources);
+	int next_busno;
+	int i;
+
+	tile_pci_init();
+
+	if (num_rc_controllers == 0 && num_ep_controllers == 0)
+		return 0;
+
+	/*
+	 * We loop over all the TRIO shims and set up the MMIO mappings.
+	 */
+	for (i = 0; i < TILEGX_NUM_TRIO; i++) {
+		gxio_trio_context_t *context = &trio_contexts[i];
+
+		if (context->fd < 0)
+			continue;
+
+		/*
+		 * Map in the MMIO space for the MAC.
+		 */
+		offset = 0;
+		context->mmio_base_mac =
+			iorpc_ioremap(context->fd, offset,
+				      HV_TRIO_CONFIG_IOREMAP_SIZE);
+		if (context->mmio_base_mac == NULL) {
+			pr_err("PCI: MAC map failure on TRIO %d\n", i);
+
+			hv_dev_close(context->fd);
+			context->fd = -1;
+			continue;
+		}
+	}
+
+	/*
+	 * Delay a bit in case devices aren't ready.  Some devices are
+	 * known to require at least 20ms here, but we use a more
+	 * conservative value.
+	 */
+	msleep(250);
+
+	/* Scan all of the recorded PCI controllers.  */
+	for (next_busno = 0, i = 0; i < num_rc_controllers; i++) {
+		struct pci_controller *controller = &pci_controllers[i];
+		gxio_trio_context_t *trio_context = controller->trio;
+		TRIO_PCIE_INTFC_PORT_CONFIG_t port_config;
+		TRIO_PCIE_INTFC_PORT_STATUS_t port_status;
+		TRIO_PCIE_INTFC_TX_FIFO_CTL_t tx_fifo_ctl;
+		struct pci_bus *bus;
+		unsigned int reg_offset;
+		unsigned int class_code_revision;
+		int trio_index;
+		int mac;
+		int ret;
+
+		if (trio_context->fd < 0)
+			continue;
+
+		trio_index = controller->trio_index;
+		mac = controller->mac;
+
+		/*
+		 * Check the port strap state which will override the BIB
+		 * setting.
+		 */
+
+		reg_offset =
+			(TRIO_PCIE_INTFC_PORT_CONFIG <<
+				TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+			(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
+				TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+			(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+		port_config.word =
+			__gxio_mmio_read(trio_context->mmio_base_mac +
+					 reg_offset);
+
+		if ((port_config.strap_state !=
+			TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_RC) &&
+			(port_config.strap_state !=
+			TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_RC_G1)) {
+			/*
+			 * If this is really intended to be an EP port,
+			 * record it so that the endpoint driver will know about it.
+			 */
+			if (port_config.strap_state ==
+			TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_ENDPOINT ||
+			port_config.strap_state ==
+			TRIO_PCIE_INTFC_PORT_CONFIG__STRAP_STATE_VAL_AUTO_CONFIG_ENDPOINT_G1)
+				pcie_ports[trio_index][mac].allow_ep = 1;
+
+			continue;
+		}
+
+		/*
+		 * Delay the RC link training if needed.
+		 */
+		if (rc_delay[trio_index][mac])
+			msleep(rc_delay[trio_index][mac] * 1000);
+
+		ret = gxio_trio_force_rc_link_up(trio_context, mac);
+		if (ret < 0)
+			pr_err("PCI: PCIE_FORCE_LINK_UP failure, "
+				"MAC %d on TRIO %d\n", mac, trio_index);
+
+		pr_info("PCI: Found PCI controller #%d on TRIO %d MAC %d\n", i,
+			trio_index, controller->mac);
+
+		/*
+		 * Wait a bit here because some EP devices take longer
+		 * to come up.
+		 */
+		msleep(1000);
+
+		/*
+		 * Check for PCIe link-up status.
+		 */
+
+		reg_offset =
+			(TRIO_PCIE_INTFC_PORT_STATUS <<
+				TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+			(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
+				TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+			(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+		port_status.word =
+			__gxio_mmio_read(trio_context->mmio_base_mac +
+					 reg_offset);
+		if (!port_status.dl_up) {
+			pr_err("PCI: link is down, MAC %d on TRIO %d\n",
+				mac, trio_index);
+			continue;
+		}
+
+		/*
+		 * Ensure that the link can come out of L1 power down state.
+		 * Strictly speaking, this is needed only in the case of
+		 * heavy RC-initiated DMAs.
+		 */
+		reg_offset =
+			(TRIO_PCIE_INTFC_TX_FIFO_CTL <<
+				TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+			(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
+				TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+			(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+		tx_fifo_ctl.word =
+			__gxio_mmio_read(trio_context->mmio_base_mac +
+					 reg_offset);
+		tx_fifo_ctl.min_p_credits = 0;
+		__gxio_mmio_write(trio_context->mmio_base_mac + reg_offset,
+				  tx_fifo_ctl.word);
+
+		/*
+		 * Change the device ID so that Linux bus crawl doesn't confuse
+		 * the internal bridge with any Tilera endpoints.
+		 */
+
+		reg_offset =
+			(TRIO_PCIE_RC_DEVICE_ID_VEN_ID <<
+				TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+			(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
+				TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+			(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+		__gxio_mmio_write32(trio_context->mmio_base_mac + reg_offset,
+				    (TILERA_GX36_RC_DEV_ID <<
+				    TRIO_PCIE_RC_DEVICE_ID_VEN_ID__DEV_ID_SHIFT) |
+				    TILERA_VENDOR_ID);
+
+		/*
+		 * Set the internal P2P bridge class code.
+		 */
+
+		reg_offset =
+			(TRIO_PCIE_RC_REVISION_ID <<
+				TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+			(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_STANDARD <<
+				TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+			(mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+		class_code_revision =
+			__gxio_mmio_read32(trio_context->mmio_base_mac +
+					   reg_offset);
+		class_code_revision = (class_code_revision & 0xff ) |
+					(PCI_CLASS_BRIDGE_PCI << 16);
+
+		__gxio_mmio_write32(trio_context->mmio_base_mac +
+				    reg_offset, class_code_revision);
+
+#ifdef USE_SHARED_PCIE_CONFIG_REGION
+
+		/*
+		 * Map in the MMIO space for the PIO region.
+		 */
+		offset = HV_TRIO_PIO_OFFSET(trio_context->pio_cfg_index) |
+			(((unsigned long long)mac) <<
+			TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT);
+
+#else
+
+		/*
+		 * Alloc a PIO region for PCI config access per MAC.
+		 */
+		ret = gxio_trio_alloc_pio_regions(trio_context, 1, 0, 0);
+		if (ret < 0) {
+			pr_err("PCI: PCI CFG PIO alloc failure for mac %d "
+				"on TRIO %d, give up\n", mac, trio_index);
+
+			continue;
+		}
+
+		trio_context->pio_cfg_index[mac] = ret;
+
+		/*
+		 * For PIO CFG, the bus_address_hi parameter is 0.
+		 */
+		ret = gxio_trio_init_pio_region_aux(trio_context,
+			trio_context->pio_cfg_index[mac],
+			mac, 0, HV_TRIO_PIO_FLAG_CONFIG_SPACE);
+		if (ret < 0) {
+			pr_err("PCI: PCI CFG PIO init failure for mac %d "
+				"on TRIO %d, give up\n", mac, trio_index);
+
+			continue;
+		}
+
+		offset = HV_TRIO_PIO_OFFSET(trio_context->pio_cfg_index[mac]) |
+			(((unsigned long long)mac) <<
+			TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT);
+
+#endif
+
+		trio_context->mmio_base_pio_cfg[mac] =
+			iorpc_ioremap(trio_context->fd, offset,
+			(1 << TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT));
+		if (trio_context->mmio_base_pio_cfg[mac] == NULL) {
+			pr_err("PCI: PIO map failure for mac %d on TRIO %d\n",
+				mac, trio_index);
+
+			continue;
+		}
+
+		/*
+		 * Initialize the PCIe interrupts.
+		 */
+		if (tile_init_irqs(controller)) {
+			pr_err("PCI: IRQs init failure for mac %d on TRIO %d\n",
+				mac, trio_index);
+
+			continue;
+		}
+
+		/*
+		 * The PCI memory resource is located above the PA space.
+		 * The memory range for the PCI root bus should not overlap
+		 * with the physical RAM
+		 */
+		pci_add_resource_offset(&resources, &controller->mem_space,
+					controller->mem_offset);
+
+		controller->first_busno = next_busno;
+		bus = pci_scan_root_bus(NULL, next_busno, controller->ops,
+					controller, &resources);
+		controller->root_bus = bus;
+		next_busno = bus->subordinate + 1;
+
+	}
+
+	/* Do machine dependent PCI interrupt routing */
+	pci_fixup_irqs(pci_common_swizzle, tile_map_irq);
+
+	/*
+	 * This comes from the generic Linux PCI driver.
+	 *
+	 * It allocates all of the resources (I/O memory, etc)
+	 * associated with the devices read in above.
+	 */
+
+	pci_assign_unassigned_resources();
+
+	/* Record the I/O resources in the PCI controller structure. */
+	for (i = 0; i < num_rc_controllers; i++) {
+		struct pci_controller *controller = &pci_controllers[i];
+		gxio_trio_context_t *trio_context = controller->trio;
+		struct pci_bus *root_bus = pci_controllers[i].root_bus;
+		struct pci_bus *next_bus;
+		uint32_t bus_address_hi;
+		struct pci_dev *dev;
+		int ret;
+		int j;
+
+		/*
+		 * Skip controllers that are not properly initialized or
+		 * have down links.
+		 */
+		if (root_bus == NULL)
+			continue;
+
+		/* Configure the max_payload_size values for this domain. */
+		fixup_read_and_payload_sizes(controller);
+
+		list_for_each_entry(dev, &root_bus->devices, bus_list) {
+			/* Find the PCI host controller, ie. the 1st bridge. */
+			if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI &&
+				(PCI_SLOT(dev->devfn) == 0)) {
+				next_bus = dev->subordinate;
+				pci_controllers[i].mem_resources[0] =
+					*next_bus->resource[0];
+				pci_controllers[i].mem_resources[1] =
+					 *next_bus->resource[1];
+				pci_controllers[i].mem_resources[2] =
+					 *next_bus->resource[2];
+
+				break;
+			}
+		}
+
+		if (pci_controllers[i].mem_resources[1].flags & IORESOURCE_MEM)
+			bus_address_hi =
+				pci_controllers[i].mem_resources[1].start >> 32;
+		else if (pci_controllers[i].mem_resources[2].flags & IORESOURCE_PREFETCH)
+			bus_address_hi =
+				pci_controllers[i].mem_resources[2].start >> 32;
+		else {
+			/* This is unlikely. */
+			pr_err("PCI: no memory resources on TRIO %d mac %d\n",
+				controller->trio_index, controller->mac);
+			continue;
+		}
+
+		/*
+		 * Alloc a PIO region for PCI memory access for each RC port.
+		 */
+		ret = gxio_trio_alloc_pio_regions(trio_context, 1, 0, 0);
+		if (ret < 0) {
+			pr_err("PCI: MEM PIO alloc failure on TRIO %d mac %d, "
+				"give up\n", controller->trio_index,
+				controller->mac);
+
+			continue;
+		}
+
+		controller->pio_mem_index = ret;
+
+		/*
+		 * For PIO MEM, the bus_address_hi parameter is hard-coded 0
+		 * because we always assign 32-bit PCI bus BAR ranges.
+		 */
+		ret = gxio_trio_init_pio_region_aux(trio_context,
+						    controller->pio_mem_index,
+						    controller->mac,
+						    0,
+						    0);
+		if (ret < 0) {
+			pr_err("PCI: MEM PIO init failure on TRIO %d mac %d, "
+				"give up\n", controller->trio_index,
+				controller->mac);
+
+			continue;
+		}
+
+		/*
+		 * Configure a Mem-Map region for each memory controller so
+		 * that Linux can map all of its PA space to the PCI bus.
+		 * Use the IOMMU to handle hash-for-home memory.
+		 */
+		for_each_online_node(j) {
+			unsigned long start_pfn = node_start_pfn[j];
+			unsigned long end_pfn = node_end_pfn[j];
+			unsigned long nr_pages = end_pfn - start_pfn;
+
+			ret = gxio_trio_alloc_memory_maps(trio_context, 1, 0,
+							  0);
+			if (ret < 0) {
+				pr_err("PCI: Mem-Map alloc failure on TRIO %d "
+					"mac %d for MC %d, give up\n",
+					controller->trio_index,
+					controller->mac, j);
+
+				goto alloc_mem_map_failed;
+			}
+
+			controller->mem_maps[j] = ret;
+
+			/*
+			 * Initialize the Mem-Map and the I/O MMU so that all
+			 * the physical memory can be accessed by the endpoint
+			 * devices. The base bus address is set to the base CPA
+			 * of this memory controller plus an offset (see pci.h).
+			 * The region's base VA is set to the base CPA. The
+			 * I/O MMU table essentially translates the CPA to
+			 * the real PA. Implicitly, for node 0, we create
+			 * a separate Mem-Map region that serves as the inbound
+			 * window for legacy 32-bit devices. This is a direct
+			 * map of the low 4GB CPA space.
+			 */
+			ret = gxio_trio_init_memory_map_mmu_aux(trio_context,
+				controller->mem_maps[j],
+				start_pfn << PAGE_SHIFT,
+				nr_pages << PAGE_SHIFT,
+				trio_context->asid,
+				controller->mac,
+				(start_pfn << PAGE_SHIFT) +
+				TILE_PCI_MEM_MAP_BASE_OFFSET,
+				j,
+				GXIO_TRIO_ORDER_MODE_UNORDERED);
+			if (ret < 0) {
+				pr_err("PCI: Mem-Map init failure on TRIO %d "
+					"mac %d for MC %d, give up\n",
+					controller->trio_index,
+					controller->mac, j);
+
+				goto alloc_mem_map_failed;
+			}
+			continue;
+
+alloc_mem_map_failed:
+			break;
+		}
+
+	}
+
+	return 0;
+}
+subsys_initcall(pcibios_init);
+
+/* Note: to be deleted after Linux 3.6 merge. */
+void __devinit pcibios_fixup_bus(struct pci_bus *bus)
+{
+}
+
+/*
+ * This can be called from the generic PCI layer, but doesn't need to
+ * do anything.
+ */
+char __devinit *pcibios_setup(char *str)
+{
+	if (!strcmp(str, "off")) {
+		pci_probe = 0;
+		return NULL;
+	}
+	return str;
+}
+
+/*
+ * This is called from the generic Linux layer.
+ */
+void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
+{
+	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
+}
+
+/*
+ * Enable memory address decoding, as appropriate, for the
+ * device described by the 'dev' struct. The I/O decoding
+ * is disabled, though the TILE-Gx supports I/O addressing.
+ *
+ * This is called from the generic PCI layer, and can be called
+ * for bridges or endpoints.
+ */
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+	return pci_enable_resources(dev, mask);
+}
+
+/* Called for each device after PCI setup is done. */
+static void __init
+pcibios_fixup_final(struct pci_dev *pdev)
+{
+	set_dma_ops(&pdev->dev, gx_pci_dma_map_ops);
+	set_dma_offset(&pdev->dev, TILE_PCI_MEM_MAP_BASE_OFFSET);
+	pdev->dev.archdata.max_direct_dma_addr =
+		TILE_PCI_MAX_DIRECT_DMA_ADDRESS;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_final);
+
+/* Map a PCI MMIO bus address into VA space. */
+void __iomem *ioremap(resource_size_t phys_addr, unsigned long size)
+{
+	struct pci_controller *controller = NULL;
+	resource_size_t bar_start;
+	resource_size_t bar_end;
+	resource_size_t offset;
+	resource_size_t start;
+	resource_size_t end;
+	int trio_fd;
+	int i, j;
+
+	start = phys_addr;
+	end = phys_addr + size - 1;
+
+	/*
+	 * In the following, each PCI controller's mem_resources[1]
+	 * represents its (non-prefetchable) PCI memory resource and
+	 * mem_resources[2] refers to its prefetchable PCI memory resource.
+	 * By searching phys_addr in each controller's mem_resources[], we can
+	 * determine the controller that should accept the PCI memory access.
+	 */
+
+	for (i = 0; i < num_rc_controllers; i++) {
+		/*
+		 * Skip controllers that are not properly initialized or
+		 * have down links.
+		 */
+		if (pci_controllers[i].root_bus == NULL)
+			continue;
+
+		for (j = 1; j < 3; j++) {
+			bar_start =
+				pci_controllers[i].mem_resources[j].start;
+			bar_end =
+				pci_controllers[i].mem_resources[j].end;
+
+			if ((start >= bar_start) && (end <= bar_end)) {
+
+				controller = &pci_controllers[i];
+
+				goto got_it;
+			}
+		}
+	}
+
+	if (controller == NULL)
+		return NULL;
+
+got_it:
+	trio_fd = controller->trio->fd;
+
+	/* Convert the resource start to the bus address offset. */
+	start = phys_addr - controller->mem_offset;
+
+	offset = HV_TRIO_PIO_OFFSET(controller->pio_mem_index) + start;
+
+	/*
+	 * We need to keep the PCI bus address's in-page offset in the VA.
+	 */
+	return iorpc_ioremap(trio_fd, offset, size) +
+		(phys_addr & (PAGE_SIZE - 1));
+}
+EXPORT_SYMBOL(ioremap);
+
+void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
+{
+	iounmap(addr);
+}
+EXPORT_SYMBOL(pci_iounmap);
+
+/****************************************************************
+ *
+ * Tile PCI config space read/write routines
+ *
+ ****************************************************************/
+
+/*
+ * These are the normal read and write ops
+ * These are expanded with macros from  pci_bus_read_config_byte() etc.
+ *
+ * devfn is the combined PCI device & function.
+ *
+ * offset is in bytes, from the start of config space for the
+ * specified bus & device.
+ */
+
+static int __devinit tile_cfg_read(struct pci_bus *bus,
+				   unsigned int devfn,
+				   int offset,
+				   int size,
+				   u32 *val)
+{
+	struct pci_controller *controller = bus->sysdata;
+	gxio_trio_context_t *trio_context = controller->trio;
+	int busnum = bus->number & 0xff;
+	int device = PCI_SLOT(devfn);
+	int function = PCI_FUNC(devfn);
+	int config_type = 1;
+	TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR_t cfg_addr;
+	void *mmio_addr;
+
+	/*
+	 * Map all accesses to the local device on root bus into the
+	 * MMIO space of the MAC. Accesses to the downstream devices
+	 * go to the PIO space.
+	 */
+	if (pci_is_root_bus(bus)) {
+		if (device == 0) {
+			/*
+			 * This is the internal downstream P2P bridge,
+			 * access directly.
+			 */
+			unsigned int reg_offset;
+
+			reg_offset = ((offset & 0xFFF) <<
+				TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+				(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_PROTECTED
+				<< TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+				(controller->mac <<
+					TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+			mmio_addr = trio_context->mmio_base_mac + reg_offset;
+
+			goto valid_device;
+
+		} else {
+			/*
+			 * We fake an empty device for (device > 0),
+			 * since there is only one device on bus 0.
+			 */
+			goto invalid_device;
+		}
+	}
+
+	/*
+	 * Accesses to the directly attached device have to be
+	 * sent as type-0 configs.
+	 */
+
+	if (busnum == (controller->first_busno + 1)) {
+		/*
+		 * There is only one device off of our built-in P2P bridge.
+		 */
+		if (device != 0)
+			goto invalid_device;
+
+		config_type = 0;
+	}
+
+	cfg_addr.word = 0;
+	cfg_addr.reg_addr = (offset & 0xFFF);
+	cfg_addr.fn = function;
+	cfg_addr.dev = device;
+	cfg_addr.bus = busnum;
+	cfg_addr.type = config_type;
+
+	/*
+	 * Note that we don't set the mac field in cfg_addr because the
+	 * mapping is per port.
+	 */
+
+	mmio_addr = trio_context->mmio_base_pio_cfg[controller->mac] +
+			cfg_addr.word;
+
+valid_device:
+
+	switch (size) {
+	case 4:
+		*val = __gxio_mmio_read32(mmio_addr);
+		break;
+
+	case 2:
+		*val = __gxio_mmio_read16(mmio_addr);
+		break;
+
+	case 1:
+		*val = __gxio_mmio_read8(mmio_addr);
+		break;
+
+	default:
+		return PCIBIOS_FUNC_NOT_SUPPORTED;
+	}
+
+	TRACE_CFG_RD(size, *val, busnum, device, function, offset);
+
+	return 0;
+
+invalid_device:
+
+	switch (size) {
+	case 4:
+		*val = 0xFFFFFFFF;
+		break;
+
+	case 2:
+		*val = 0xFFFF;
+		break;
+
+	case 1:
+		*val = 0xFF;
+		break;
+
+	default:
+		return PCIBIOS_FUNC_NOT_SUPPORTED;
+	}
+
+	return 0;
+}
+
+
+/*
+ * See tile_cfg_read() for relevent comments.
+ * Note that "val" is the value to write, not a pointer to that value.
+ */
+static int __devinit tile_cfg_write(struct pci_bus *bus,
+				    unsigned int devfn,
+				    int offset,
+				    int size,
+				    u32 val)
+{
+	struct pci_controller *controller = bus->sysdata;
+	gxio_trio_context_t *trio_context = controller->trio;
+	int busnum = bus->number & 0xff;
+	int device = PCI_SLOT(devfn);
+	int function = PCI_FUNC(devfn);
+	int config_type = 1;
+	TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR_t cfg_addr;
+	void *mmio_addr;
+	u32 val_32 = (u32)val;
+	u16 val_16 = (u16)val;
+	u8 val_8 = (u8)val;
+
+	/*
+	 * Map all accesses to the local device on root bus into the
+	 * MMIO space of the MAC. Accesses to the downstream devices
+	 * go to the PIO space.
+	 */
+	if (pci_is_root_bus(bus)) {
+		if (device == 0) {
+			/*
+			 * This is the internal downstream P2P bridge,
+			 * access directly.
+			 */
+			unsigned int reg_offset;
+
+			reg_offset = ((offset & 0xFFF) <<
+				TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+				(TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_PROTECTED
+				<< TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
+				(controller->mac <<
+					TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+			mmio_addr = trio_context->mmio_base_mac + reg_offset;
+
+			goto valid_device;
+
+		} else {
+			/*
+			 * We fake an empty device for (device > 0),
+			 * since there is only one device on bus 0.
+			 */
+			goto invalid_device;
+		}
+	}
+
+	/*
+	 * Accesses to the directly attached device have to be
+	 * sent as type-0 configs.
+	 */
+
+	if (busnum == (controller->first_busno + 1)) {
+		/*
+		 * There is only one device off of our built-in P2P bridge.
+		 */
+		if (device != 0)
+			goto invalid_device;
+
+		config_type = 0;
+	}
+
+	cfg_addr.word = 0;
+	cfg_addr.reg_addr = (offset & 0xFFF);
+	cfg_addr.fn = function;
+	cfg_addr.dev = device;
+	cfg_addr.bus = busnum;
+	cfg_addr.type = config_type;
+
+	/*
+	 * Note that we don't set the mac field in cfg_addr because the
+	 * mapping is per port.
+	 */
+
+	mmio_addr = trio_context->mmio_base_pio_cfg[controller->mac] +
+			cfg_addr.word;
+
+valid_device:
+
+	switch (size) {
+	case 4:
+		__gxio_mmio_write32(mmio_addr, val_32);
+		TRACE_CFG_WR(size, val_32, busnum, device, function, offset);
+		break;
+
+	case 2:
+		__gxio_mmio_write16(mmio_addr, val_16);
+		TRACE_CFG_WR(size, val_16, busnum, device, function, offset);
+		break;
+
+	case 1:
+		__gxio_mmio_write8(mmio_addr, val_8);
+		TRACE_CFG_WR(size, val_8, busnum, device, function, offset);
+		break;
+
+	default:
+		return PCIBIOS_FUNC_NOT_SUPPORTED;
+	}
+
+invalid_device:
+
+	return 0;
+}
+
+
+static struct pci_ops tile_cfg_ops = {
+	.read =         tile_cfg_read,
+	.write =        tile_cfg_write,
+};
+
+
+/*
+ * MSI support starts here.
+ */
+static unsigned int
+tilegx_msi_startup(struct irq_data *d)
+{
+	if (d->msi_desc)
+		unmask_msi_irq(d);
+
+	return 0;
+}
+
+static void
+tilegx_msi_ack(struct irq_data *d)
+{
+	__insn_mtspr(SPR_IPI_EVENT_RESET_K, 1UL << d->irq);
+}
+
+static void
+tilegx_msi_mask(struct irq_data *d)
+{
+	mask_msi_irq(d);
+	__insn_mtspr(SPR_IPI_MASK_SET_K, 1UL << d->irq);
+}
+
+static void
+tilegx_msi_unmask(struct irq_data *d)
+{
+	__insn_mtspr(SPR_IPI_MASK_RESET_K, 1UL << d->irq);
+	unmask_msi_irq(d);
+}
+
+static struct irq_chip tilegx_msi_chip = {
+	.name			= "tilegx_msi",
+	.irq_startup		= tilegx_msi_startup,
+	.irq_ack		= tilegx_msi_ack,
+	.irq_mask		= tilegx_msi_mask,
+	.irq_unmask		= tilegx_msi_unmask,
+
+	/* TBD: support set_affinity. */
+};
+
+int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
+{
+	struct pci_controller *controller;
+	gxio_trio_context_t *trio_context;
+	struct msi_msg msg;
+	int default_irq;
+	uint64_t mem_map_base;
+	uint64_t mem_map_limit;
+	u64 msi_addr;
+	int mem_map;
+	int cpu;
+	int irq;
+	int ret;
+
+	irq = create_irq();
+	if (irq < 0)
+		return irq;
+
+	/*
+	 * Since we use a 64-bit Mem-Map to accept the MSI write, we fail
+	 * devices that are not capable of generating a 64-bit message address.
+	 * These devices will fall back to using the legacy interrupts.
+	 * Most PCIe endpoint devices do support 64-bit message addressing.
+	 */
+	if (desc->msi_attrib.is_64 == 0) {
+		dev_printk(KERN_INFO, &pdev->dev,
+			"64-bit MSI message address not supported, "
+			"falling back to legacy interrupts.\n");
+
+		ret = -ENOMEM;
+		goto is_64_failure;
+	}
+
+	default_irq = desc->msi_attrib.default_irq;
+	controller = irq_get_handler_data(default_irq);
+
+	BUG_ON(!controller);
+
+	trio_context = controller->trio;
+
+	/*
+	 * Allocate the Mem-Map that will accept the MSI write and
+	 * trigger the TILE-side interrupts.
+	 */
+	mem_map = gxio_trio_alloc_memory_maps(trio_context, 1, 0, 0);
+	if (mem_map < 0) {
+		dev_printk(KERN_INFO, &pdev->dev,
+			"%s Mem-Map alloc failure. "
+			"Failed to initialize MSI interrupts. "
+			"Falling back to legacy interrupts.\n",
+			desc->msi_attrib.is_msix ? "MSI-X" : "MSI");
+
+		ret = -ENOMEM;
+		goto msi_mem_map_alloc_failure;
+	}
+
+	/* We try to distribute different IRQs to different tiles. */
+	cpu = tile_irq_cpu(irq);
+
+	/*
+	 * Now call up to the HV to configure the Mem-Map interrupt and
+	 * set up the IPI binding.
+	 */
+	mem_map_base = MEM_MAP_INTR_REGIONS_BASE +
+		mem_map * MEM_MAP_INTR_REGION_SIZE;
+	mem_map_limit = mem_map_base + MEM_MAP_INTR_REGION_SIZE - 1;
+
+	ret = gxio_trio_config_msi_intr(trio_context, cpu_x(cpu), cpu_y(cpu),
+					KERNEL_PL, irq, controller->mac,
+					mem_map, mem_map_base, mem_map_limit,
+					trio_context->asid);
+	if (ret < 0) {
+		dev_printk(KERN_INFO, &pdev->dev, "HV MSI config failed.\n");
+
+		goto hv_msi_config_failure;
+	}
+
+	irq_set_msi_desc(irq, desc);
+
+	msi_addr = mem_map_base + TRIO_MAP_MEM_REG_INT3 - TRIO_MAP_MEM_REG_INT0;
+
+	msg.address_hi = msi_addr >> 32;
+	msg.address_lo = msi_addr & 0xffffffff;
+
+	msg.data = mem_map;
+
+	write_msi_msg(irq, &msg);
+	irq_set_chip_and_handler(irq, &tilegx_msi_chip, handle_level_irq);
+	irq_set_handler_data(irq, controller);
+
+	return 0;
+
+hv_msi_config_failure:
+	/* Free mem-map */
+msi_mem_map_alloc_failure:
+is_64_failure:
+	destroy_irq(irq);
+	return ret;
+}
+
+void arch_teardown_msi_irq(unsigned int irq)
+{
+	destroy_irq(irq);
+}

arch/tile/kernel/setup.c

···
 #include <linux/irq.h>
 #include <linux/kexec.h>
 #include <linux/pci.h>
+#include <linux/swiotlb.h>
 #include <linux/initrd.h>
 #include <linux/io.h>
 #include <linux/highmem.h>
···
 };
 static nodemask_t __initdata isolnodes;
 
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
 enum { DEFAULT_PCI_RESERVE_MB = 64 };
 static unsigned int __initdata pci_reserve_mb = DEFAULT_PCI_RESERVE_MB;
 unsigned long __initdata pci_reserve_start_pfn = -1U;
···
 }
 early_param("isolnodes", setup_isolnodes);
 
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
 static int __init setup_pci_reserve(char* str)
 {
 	unsigned long mb;
···
 
 	pci_reserve_mb = mb;
 	pr_info("Reserving %dMB for PCIE root complex mappings\n",
-	       pci_reserve_mb);
+		pci_reserve_mb);
 	return 0;
 }
 early_param("pci_reserve", setup_pci_reserve);
···
 			continue;
 		}
 #endif
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
 		/*
 		 * Blocks that overlap the pci reserved region must
 		 * have enough space to hold the maximum percpu data
···
 	/* Free all the space back into the allocator. */
 	free_bootmem(PFN_PHYS(start), PFN_PHYS(end - start));
 
-#if defined(CONFIG_PCI)
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
 	/*
-	 * Throw away any memory aliased by the PCI region.  FIXME: this
-	 * is a temporary hack to work around bug 10502, and needs to be
-	 * fixed properly.
+	 * Throw away any memory aliased by the PCI region.
 	 */
 	if (pci_reserve_start_pfn < end && pci_reserve_end_pfn > start)
 		reserve_bootmem(PFN_PHYS(pci_reserve_start_pfn),
···
 	unsigned long zones_size[MAX_NR_ZONES] = { 0 };
 	int size = percpu_size();
 	int num_cpus = smp_height * smp_width;
+	const unsigned long dma_end = (1UL << (32 - PAGE_SHIFT));
+
 	int i;
 
 	for (i = 0; i < num_cpus; ++i)
···
 		zones_size[ZONE_NORMAL] = end - start;
 #endif
 
+		if (start < dma_end) {
+			zones_size[ZONE_DMA] = min(zones_size[ZONE_NORMAL],
+						   dma_end - start);
+			zones_size[ZONE_NORMAL] -= zones_size[ZONE_DMA];
+		} else {
+			zones_size[ZONE_DMA] = 0;
+		}
+
 		/* Take zone metadata from controller 0 if we're isolnode. */
 		if (node_isset(i, isolnodes))
 			NODE_DATA(i)->bdata = &bootmem_node_data[0];
···
 		       PFN_UP(node_percpu[i]));
 
 		/* Track the type of memory on each node */
-		if (zones_size[ZONE_NORMAL])
+		if (zones_size[ZONE_NORMAL] || zones_size[ZONE_DMA])
 			node_set_state(i, N_NORMAL_MEMORY);
 #ifdef CONFIG_HIGHMEM
 		if (end != start)
···
 	setup_cpu_maps();
 
 
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
 	/*
 	 * Initialize the PCI structures.  This is done before memory
 	 * setup so that we know whether or not a pci_reserve region
···
 	 * NOTE: before this point _nobody_ is allowed to allocate
 	 * any memory using the bootmem allocator.
 	 */
+
+#ifdef CONFIG_SWIOTLB
+	swiotlb_init(0);
+#endif
 
 	paging_init();
 	setup_numa_mapping();
···
 };
 
 /*
- * We reserve all resources above 4GB so that PCI won't try to put
- * mappings above 4GB; the standard allows that for some devices but
- * the probing code trunates values to 32 bits.
+ * On Pro, we reserve all resources above 4GB so that PCI won't try to put
+ * mappings above 4GB.
  */
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
 static struct resource* __init
 insert_non_bus_resource(void)
 {
···
 	int i;
 	enum { CODE_DELTA = MEM_SV_INTRPT - PAGE_OFFSET };
 
-	iomem_resource.end = -1LL;
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
 	insert_non_bus_resource();
 #endif
 
···
 		u64 start_pfn = node_start_pfn[i];
 		u64 end_pfn = node_end_pfn[i];
 
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
 		if (start_pfn <= pci_reserve_start_pfn &&
 		    end_pfn > pci_reserve_start_pfn) {
 			if (end_pfn > pci_reserve_end_pfn)

arch/tile/kernel/usb.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ *
+ * Register the Tile-Gx USB interfaces as platform devices.
+ *
+ * The actual USB driver is just some glue (in
+ * drivers/usb/host/[eo]hci-tilegx.c) which makes the registers available
+ * to the standard kernel EHCI and OHCI drivers.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+#include <linux/usb/tilegx.h>
+#include <linux/types.h>
+
+static u64 ehci_dmamask = DMA_BIT_MASK(32);
+
+#define USB_HOST_DEF(unit, type, dmamask) \
+	static struct \
+	    tilegx_usb_platform_data tilegx_usb_platform_data_ ## type ## \
+		hci ## unit = { \
+		.dev_index = unit, \
+	}; \
+	\
+	static struct platform_device tilegx_usb_ ## type ## hci ## unit = { \
+		.name		= "tilegx-" #type "hci", \
+		.id		= unit, \
+		.dev = { \
+			.dma_mask		= dmamask, \
+			.coherent_dma_mask	= DMA_BIT_MASK(32), \
+			.platform_data = \
+				&tilegx_usb_platform_data_ ## type ## hci ## \
+				unit, \
+		}, \
+	};
+
+USB_HOST_DEF(0, e, &ehci_dmamask)
+USB_HOST_DEF(0, o, NULL)
+USB_HOST_DEF(1, e, &ehci_dmamask)
+USB_HOST_DEF(1, o, NULL)
+
+#undef USB_HOST_DEF
+
+static struct platform_device *tilegx_usb_devices[] __initdata = {
+	&tilegx_usb_ehci0,
+	&tilegx_usb_ehci1,
+	&tilegx_usb_ohci0,
+	&tilegx_usb_ohci1,
+};
+
+/** Add our set of possible USB devices. */
+static int __init tilegx_usb_init(void)
+{
+	platform_add_devices(tilegx_usb_devices,
+			     ARRAY_SIZE(tilegx_usb_devices));
+
+	return 0;
+}
+arch_initcall(tilegx_usb_init);

arch/tile/lib/checksum.c

···
 #include <net/checksum.h>
 #include <linux/module.h>
 
-static inline unsigned int longto16(unsigned long x)
-{
-	unsigned long ret;
-#ifdef __tilegx__
-	ret = __insn_v2sadu(x, 0);
-	ret = __insn_v2sadu(ret, 0);
-#else
-	ret = __insn_sadh_u(x, 0);
-	ret = __insn_sadh_u(ret, 0);
-#endif
-	return ret;
-}
-
 __wsum do_csum(const unsigned char *buff, int len)
 {
 	int odd, count;
···
 	}
 	if (len & 1)
 		result += *buff;
-	result = longto16(result);
+	result = csum_long(result);
 	if (odd)
 		result = swab16(result);
 out:

arch/tile/mm/homecache.c

···
 
 #endif
 
-/* Provide no-op versions of these routines to keep flush_remote() cleaner. */
-#define mark_caches_evicted_start() 0
-#define mark_caches_evicted_finish(mask, timestamp) do {} while (0)
-
 
 /*
  * Update the irq_stat for cpus that we are going to interrupt
···
  *    there's never any good reason for hv_flush_remote() to fail.
  *  - Accepts a 32-bit PFN rather than a 64-bit PA, which generally
  *    is the type that Linux wants to pass around anyway.
- *  - Centralizes the mark_caches_evicted() handling.
  *  - Canonicalizes that lengths of zero make cpumasks NULL.
  *  - Handles deferring TLB flushes for dataplane tiles.
  *  - Tracks remote interrupts in the per-cpu irq_cpustat_t.
···
 		  HV_Remote_ASID *asids, int asidcount)
 {
 	int rc;
-	int timestamp = 0;  /* happy compiler */
 	struct cpumask cache_cpumask_copy, tlb_cpumask_copy;
 	struct cpumask *cache_cpumask, *tlb_cpumask;
 	HV_PhysAddr cache_pa;
···
 	hv_flush_update(cache_cpumask, tlb_cpumask, tlb_va, tlb_length,
 			asids, asidcount);
 	cache_pa = (HV_PhysAddr)cache_pfn << PAGE_SHIFT;
-	if (cache_control & HV_FLUSH_EVICT_L2)
-		timestamp = mark_caches_evicted_start();
 	rc = hv_flush_remote(cache_pa, cache_control,
 			     cpumask_bits(cache_cpumask),
 			     tlb_va, tlb_length, tlb_pgsize,
 			     cpumask_bits(tlb_cpumask),
 			     asids, asidcount);
-	if (cache_control & HV_FLUSH_EVICT_L2)
-		mark_caches_evicted_finish(cache_cpumask, timestamp);
 	if (rc == 0)
 		return;
 	cpumask_scnprintf(cache_buf, sizeof(cache_buf), &cache_cpumask_copy);
···
 	panic("Unsafe to continue.");
 }
 
-void flush_remote_page(struct page *page, int order)
+static void homecache_finv_page_va(void* va, int home)
 {
-	int i, pages = (1 << order);
-	for (i = 0; i < pages; ++i, ++page) {
-		void *p = kmap_atomic(page);
-		int hfh = 0;
-		int home = page_home(page);
-#if CHIP_HAS_CBOX_HOME_MAP()
-		if (home == PAGE_HOME_HASH)
-			hfh = 1;
-		else
-#endif
-			BUG_ON(home < 0 || home >= NR_CPUS);
-		finv_buffer_remote(p, PAGE_SIZE, hfh);
-		kunmap_atomic(p);
+	if (home == smp_processor_id()) {
+		finv_buffer_local(va, PAGE_SIZE);
+	} else if (home == PAGE_HOME_HASH) {
+		finv_buffer_remote(va, PAGE_SIZE, 1);
+	} else {
+		BUG_ON(home < 0 || home >= NR_CPUS);
+		finv_buffer_remote(va, PAGE_SIZE, 0);
 	}
+}
+
+void homecache_finv_map_page(struct page *page, int home)
+{
+	unsigned long flags;
+	unsigned long va;
+	pte_t *ptep;
+	pte_t pte;
+
+	if (home == PAGE_HOME_UNCACHED)
+		return;
+	local_irq_save(flags);
+#ifdef CONFIG_HIGHMEM
+	va = __fix_to_virt(FIX_KMAP_BEGIN + kmap_atomic_idx_push() +
+			   (KM_TYPE_NR * smp_processor_id()));
+#else
+	va = __fix_to_virt(FIX_HOMECACHE_BEGIN + smp_processor_id());
+#endif
+	ptep = virt_to_pte(NULL, (unsigned long)va);
+	pte = pfn_pte(page_to_pfn(page), PAGE_KERNEL);
+	__set_pte(ptep, pte_set_home(pte, home));
+	homecache_finv_page_va((void *)va, home);
+	__pte_clear(ptep);
+	hv_flush_page(va, PAGE_SIZE);
+#ifdef CONFIG_HIGHMEM
+	kmap_atomic_idx_pop();
+#endif
+	local_irq_restore(flags);
+}
+
+static void homecache_finv_page_home(struct page *page, int home)
+{
+	if (!PageHighMem(page) && home == page_home(page))
+		homecache_finv_page_va(page_address(page), home);
+	else
+		homecache_finv_map_page(page, home);
+}
+
+static inline bool incoherent_home(int home)
+{
+	return home == PAGE_HOME_IMMUTABLE || home == PAGE_HOME_INCOHERENT;
+}
+
+static void homecache_finv_page_internal(struct page *page, int force_map)
+{
+	int home = page_home(page);
+	if (home == PAGE_HOME_UNCACHED)
+		return;
+	if (incoherent_home(home)) {
+		int cpu;
+		for_each_cpu(cpu, &cpu_cacheable_map)
+			homecache_finv_map_page(page, cpu);
+	} else if (force_map) {
+		/* Force if, e.g., the normal mapping is migrating. */
+		homecache_finv_map_page(page, home);
+	} else {
+		homecache_finv_page_home(page, home);
+	}
+	sim_validate_lines_evicted(PFN_PHYS(page_to_pfn(page)), PAGE_SIZE);
+}
+
+void homecache_finv_page(struct page *page)
+{
+	homecache_finv_page_internal(page, 0);
 }
 
 void homecache_evict(const struct cpumask *mask)
 {
 	flush_remote(0, HV_FLUSH_EVICT_L2, mask, 0, 0, 0, NULL, NULL, 0);
 }
-
-/*
- * Return a mask of the cpus whose caches currently own these pages.
- * The return value is whether the pages are all coherently cached
- * (i.e. none are immutable, incoherent, or uncached).
- */
-static int homecache_mask(struct page *page, int pages,
-			  struct cpumask *home_mask)
-{
-	int i;
-	int cached_coherently = 1;
-	cpumask_clear(home_mask);
-	for (i = 0; i < pages; ++i) {
-		int home = page_home(&page[i]);
-		if (home == PAGE_HOME_IMMUTABLE ||
-		    home == PAGE_HOME_INCOHERENT) {
-			cpumask_copy(home_mask, cpu_possible_mask);
-			return 0;
-		}
-#if CHIP_HAS_CBOX_HOME_MAP()
-		if (home == PAGE_HOME_HASH) {
-			cpumask_or(home_mask, home_mask, &hash_for_home_map);
-			continue;
-		}
-#endif
-		if (home == PAGE_HOME_UNCACHED) {
-			cached_coherently = 0;
-			continue;
-		}
-		BUG_ON(home < 0 || home >= NR_CPUS);
-		cpumask_set_cpu(home, home_mask);
-	}
-	return cached_coherently;
-}
-
-/*
- * Return the passed length, or zero if it's long enough that we
- * believe we should evict the whole L2 cache.
- */
-static unsigned long cache_flush_length(unsigned long length)
-{
-	return (length >= CHIP_L2_CACHE_SIZE()) ? HV_FLUSH_EVICT_L2 : length;
-}
-
-/* Flush a page out of whatever cache(s) it is in. */
-void homecache_flush_cache(struct page *page, int order)
-{
-	int pages = 1 << order;
-	int length = cache_flush_length(pages * PAGE_SIZE);
-	unsigned long pfn = page_to_pfn(page);
-	struct cpumask home_mask;
-
-	homecache_mask(page, pages, &home_mask);
-	flush_remote(pfn, length, &home_mask, 0, 0, 0, NULL, NULL, 0);
-	sim_validate_lines_evicted(PFN_PHYS(pfn), pages * PAGE_SIZE);
-}
-
 
 /* Report the home corresponding to a given PTE. */
 static int pte_to_home(pte_t pte)
···
 	return page;
 }
 
-void homecache_free_pages(unsigned long addr, unsigned int order)
+void __homecache_free_pages(struct page *page, unsigned int order)
 {
-	struct page *page;
-
-	if (addr == 0)
-		return;
-
-	VM_BUG_ON(!virt_addr_valid((void *)addr));
-	page = virt_to_page((void *)addr);
 	if (put_page_testzero(page)) {
 		homecache_change_page_home(page, order, initial_page_home());
 		if (order == 0) {
···
 		}
 	}
 }
+EXPORT_SYMBOL(__homecache_free_pages);
+
+void homecache_free_pages(unsigned long addr, unsigned int order)
+{
+	if (addr != 0) {
+		VM_BUG_ON(!virt_addr_valid((void *)addr));
+		__homecache_free_pages(virt_to_page((void *)addr), order);
+	}
+}
+EXPORT_SYMBOL(homecache_free_pages);

arch/tile/mm/init.c

···
 	assign_pte(pmd, pte);
 }
 
-#ifdef CONFIG_HIGHMEM
+#ifdef __tilegx__
+static pmd_t *__init get_pmd(pgd_t pgtables[], unsigned long va)
+{
+	pud_t *pud = pud_offset(&pgtables[pgd_index(va)], va);
+	if (pud_none(*pud))
+		assign_pmd(pud, alloc_pmd());
+	return pmd_offset(pud, va);
+}
+#else
+static pmd_t *__init get_pmd(pgd_t pgtables[], unsigned long va)
+{
+	return pmd_offset(pud_offset(&pgtables[pgd_index(va)], va), va);
+}
+#endif
+
 /*
  * This function initializes a certain range of kernel virtual memory
  * with new bootmem page tables, everywhere page tables are missing in
···
  * checking the pgd every time.
  */
 static void __init page_table_range_init(unsigned long start,
-					 unsigned long end, pgd_t *pgd_base)
+					 unsigned long end, pgd_t *pgd)
 {
-	pgd_t *pgd;
-	int pgd_idx;
 	unsigned long vaddr;
-
-	vaddr = start;
-	pgd_idx = pgd_index(vaddr);
-	pgd = pgd_base + pgd_idx;
-
-	for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
-		pmd_t *pmd = pmd_offset(pud_offset(pgd, vaddr), vaddr);
+	start = round_down(start, PMD_SIZE);
+	end = round_up(end, PMD_SIZE);
+	for (vaddr = start; vaddr < end; vaddr += PMD_SIZE) {
+		pmd_t *pmd = get_pmd(pgd, vaddr);
 		if (pmd_none(*pmd))
 			assign_pte(pmd, alloc_pte());
-		vaddr += PMD_SIZE;
 	}
 }
-#endif /* CONFIG_HIGHMEM */
 
 
 #if CHIP_HAS_CBOX_HOME_MAP()
···
 #endif
 	return prot;
 }
-
-#ifndef __tilegx__
-static pmd_t *__init get_pmd(pgd_t pgtables[], unsigned long va)
-{
-	return pmd_offset(pud_offset(&pgtables[pgd_index(va)], va), va);
-}
-#else
-static pmd_t *__init get_pmd(pgd_t pgtables[], unsigned long va)
-{
-	pud_t *pud = pud_offset(&pgtables[pgd_index(va)], va);
-	if (pud_none(*pud))
-		assign_pmd(pud, alloc_pmd());
-	return pmd_offset(pud, va);
-}
-#endif
 
 /* Temporary page table we use for staging. */
 static pgd_t pgtables[PTRS_PER_PGD]
···
 	for_each_zone(z) {
 		unsigned long start, end;
 		int nid = z->zone_pgdat->node_id;
+#ifdef CONFIG_HIGHMEM
 		int idx = zone_idx(z);
+#endif
 
 		start = z->zone_start_pfn;
-		if (start == 0)
-			continue;  /* bootmem */
 		end = start + z->spanned_pages;
-		if (idx == ZONE_NORMAL) {
-			BUG_ON(start != node_start_pfn[nid]);
-			start = node_free_pfn[nid];
-		}
+		start = max(start, node_free_pfn[nid]);
+		start = max(start, max_low_pfn);
+
 #ifdef CONFIG_HIGHMEM
 		if (idx == ZONE_HIGHMEM)
 			totalhigh_pages += z->spanned_pages;
···
  */
 void __init paging_init(void)
 {
-#ifdef CONFIG_HIGHMEM
-	unsigned long vaddr, end;
-#endif
 #ifdef __tilegx__
 	pud_t *pud;
 #endif
···
 
 	kernel_physical_mapping_init(pgd_base);
 
-#ifdef CONFIG_HIGHMEM
 	/*
 	 * Fixed mappings, only the page table structure has to be
 	 * created - mappings will be set by set_fixmap():
 	 */
-	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
-	end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
-	page_table_range_init(vaddr, end, pgd_base);
+	page_table_range_init(fix_to_virt(__end_of_fixed_addresses - 1),
+			      FIXADDR_TOP, pgd_base);
+
+#ifdef CONFIG_HIGHMEM
 	permanent_kmaps_init(pgd_base);
 #endif
 

arch/tile/mm/pgtable.c

···
 }
 EXPORT_SYMBOL(ioremap_prot);
 
-/* Map a PCI MMIO bus address into VA space. */
-void __iomem *ioremap(resource_size_t phys_addr, unsigned long size)
-{
-	panic("ioremap for PCI MMIO is not supported");
-}
-EXPORT_SYMBOL(ioremap);
-
 /* Unmap an MMIO VA mapping. */
 void iounmap(volatile void __iomem *addr_in)
 {

drivers/pci/quirks.c

···
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82875_HB,
 			quirk_unhide_mch_dev6);
 
-#ifdef CONFIG_TILE
+#ifdef CONFIG_TILEPRO
 /*
- * The Tilera TILEmpower platform needs to set the link speed
+ * The Tilera TILEmpower tilepro platform needs to set the link speed
  * to 2.5GT(Giga-Transfers)/s (Gen 1). The default link speed
  * setting is 5GT/s (Gen 2). 0x98 is the Link Control2 PCIe
  * capability register of the PEX8624 PCIe switch. The switch
···
 	}
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8624, quirk_tile_plx_gen1);
-#endif /* CONFIG_TILE */
+#endif /* CONFIG_TILEPRO */
 
 #ifdef CONFIG_PCI_MSI
 /* Some chipsets do not support MSI. We cannot easily rely on setting

drivers/usb/host/ehci-hcd.c

···
 #define PLATFORM_DRIVER		ehci_msm_driver
 #endif
 
+#ifdef CONFIG_TILE_USB
+#include "ehci-tilegx.c"
+#define	PLATFORM_DRIVER		ehci_hcd_tilegx_driver
+#endif
+
 #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
 #include "ehci-pmcmsp.c"
 #define	PLATFORM_DRIVER		ehci_hcd_msp_driver

drivers/usb/host/ehci-tilegx.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/*
+ * Tilera TILE-Gx USB EHCI host controller driver.
+ */
+
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/usb/tilegx.h>
+#include <linux/usb.h>
+
+#include <asm/homecache.h>
+
+#include <gxio/iorpc_usb_host.h>
+#include <gxio/usb_host.h>
+
+static void tilegx_start_ehc(void)
+{
+}
+
+static void tilegx_stop_ehc(void)
+{
+}
+
+static int tilegx_ehci_setup(struct usb_hcd *hcd)
+{
+	int ret = ehci_init(hcd);
+
+	/*
+	 * Some drivers do:
+	 *
+	 *   struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+	 *   ehci->need_io_watchdog = 0;
+	 *
+	 * here, but since this is a new driver we're going to leave the
+	 * watchdog enabled.  Later we may try to turn it off and see
+	 * whether we run into any problems.
+	 */
+
+	return ret;
+}
+
+static const struct hc_driver ehci_tilegx_hc_driver = {
+	.description		= hcd_name,
+	.product_desc		= "Tile-Gx EHCI",
+	.hcd_priv_size		= sizeof(struct ehci_hcd),
+
+	/*
+	 * Generic hardware linkage.
+	 */
+	.irq			= ehci_irq,
+	.flags			= HCD_MEMORY | HCD_USB2,
+
+	/*
+	 * Basic lifecycle operations.
+	 */
+	.reset			= tilegx_ehci_setup,
+	.start			= ehci_run,
+	.stop			= ehci_stop,
+	.shutdown		= ehci_shutdown,
+
+	/*
+	 * Managing I/O requests and associated device resources.
+	 */
+	.urb_enqueue		= ehci_urb_enqueue,
+	.urb_dequeue		= ehci_urb_dequeue,
+	.endpoint_disable	= ehci_endpoint_disable,
+	.endpoint_reset		= ehci_endpoint_reset,
+
+	/*
+	 * Scheduling support.
+	 */
+	.get_frame_number	= ehci_get_frame,
+
+	/*
+	 * Root hub support.
+	 */
+	.hub_status_data	= ehci_hub_status_data,
+	.hub_control		= ehci_hub_control,
+	.bus_suspend		= ehci_bus_suspend,
+	.bus_resume		= ehci_bus_resume,
+	.relinquish_port	= ehci_relinquish_port,
+	.port_handed_over	= ehci_port_handed_over,
+
+	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
+};
+
+static int ehci_hcd_tilegx_drv_probe(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd;
+	struct ehci_hcd *ehci;
+	struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
+	pte_t pte = { 0 };
+	int my_cpu = smp_processor_id();
+	int ret;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	/*
+	 * Try to initialize our GXIO context; if we can't, the device
+	 * doesn't exist.
+	 */
+	if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 1) != 0)
+		return -ENXIO;
+
+	hcd = usb_create_hcd(&ehci_tilegx_hc_driver, &pdev->dev,
+			     dev_name(&pdev->dev));
+	if (!hcd)
+		return -ENOMEM;
+
+	/*
+	 * We don't use rsrc_start to map in our registers, but seems like
+	 * we ought to set it to something, so we use the register VA.
+	 */
+	hcd->rsrc_start =
+		(ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
+	hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
+	hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
+
+	tilegx_start_ehc();
+
+	ehci = hcd_to_ehci(hcd);
+	ehci->caps = hcd->regs;
+	ehci->regs =
+		hcd->regs + HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
+	/* cache this readonly data; minimize chip reads */
+	ehci->hcs_params = readl(&ehci->caps->hcs_params);
+
+	/* Create our IRQs and register them. */
+	pdata->irq = create_irq();
+	if (pdata->irq < 0) {
+		ret = -ENXIO;
+		goto err_no_irq;
+	}
+
+	tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
+
+	/* Configure interrupts. */
+	ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
+					  cpu_x(my_cpu), cpu_y(my_cpu),
+					  KERNEL_PL, pdata->irq);
+	if (ret) {
+		ret = -ENXIO;
+		goto err_have_irq;
+	}
+
+	/* Register all of our memory. */
+	pte = pte_set_home(pte, PAGE_HOME_HASH);
+	ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
+	if (ret) {
+		ret = -ENXIO;
+		goto err_have_irq;
+	}
+
+	ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
+	if (ret == 0) {
+		platform_set_drvdata(pdev, hcd);
+		return ret;
+	}
+
+err_have_irq:
+	destroy_irq(pdata->irq);
+err_no_irq:
+	tilegx_stop_ehc();
+	usb_put_hcd(hcd);
+	gxio_usb_host_destroy(&pdata->usb_ctx);
+	return ret;
+}
+
+static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
+
+	usb_remove_hcd(hcd);
+	usb_put_hcd(hcd);
+	tilegx_stop_ehc();
+	gxio_usb_host_destroy(&pdata->usb_ctx);
+	destroy_irq(pdata->irq);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
+{
+	usb_hcd_platform_shutdown(pdev);
+	ehci_hcd_tilegx_drv_remove(pdev);
+}
+
+static struct platform_driver ehci_hcd_tilegx_driver = {
+	.probe		= ehci_hcd_tilegx_drv_probe,
+	.remove		= ehci_hcd_tilegx_drv_remove,
+	.shutdown	= ehci_hcd_tilegx_drv_shutdown,
+	.driver = {
+		.name	= "tilegx-ehci",
+		.owner	= THIS_MODULE,
+	}
+};
+
+MODULE_ALIAS("platform:tilegx-ehci");

drivers/usb/host/ohci-hcd.c

···
 #define PLATFORM_DRIVER		ohci_octeon_driver
 #endif
 
+#ifdef CONFIG_TILE_USB
+#include "ohci-tilegx.c"
+#define PLATFORM_DRIVER		ohci_hcd_tilegx_driver
+#endif
+
 #ifdef CONFIG_USB_CNS3XXX_OHCI
 #include "ohci-cns3xxx.c"
 #define PLATFORM_DRIVER		ohci_hcd_cns3xxx_driver

drivers/usb/host/ohci-tilegx.c

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/*
+ * Tilera TILE-Gx USB OHCI host controller driver.
+ */
+
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/usb/tilegx.h>
+#include <linux/usb.h>
+
+#include <asm/homecache.h>
+
+#include <gxio/iorpc_usb_host.h>
+#include <gxio/usb_host.h>
+
+static void tilegx_start_ohc(void)
+{
+}
+
+static void tilegx_stop_ohc(void)
+{
+}
+
+static int tilegx_ohci_start(struct usb_hcd *hcd)
+{
+	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+	int ret;
+
+	ret = ohci_init(ohci);
+	if (ret < 0)
+		return ret;
+
+	ret = ohci_run(ohci);
+	if (ret < 0) {
+		dev_err(hcd->self.controller, "can't start %s\n",
+			hcd->self.bus_name);
+		ohci_stop(hcd);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct hc_driver ohci_tilegx_hc_driver = {
+	.description		= hcd_name,
+	.product_desc		= "Tile-Gx OHCI",
+	.hcd_priv_size		= sizeof(struct ohci_hcd),
+
+	/*
+	 * Generic hardware linkage.
+	 */
+	.irq			= ohci_irq,
+	.flags			= HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11,
+
+	/*
+	 * Basic lifecycle operations.
+	 */
+	.start			= tilegx_ohci_start,
+	.stop			= ohci_stop,
+	.shutdown		= ohci_shutdown,
+
+	/*
+	 * Managing I/O requests and associated device resources.
+	 */
+	.urb_enqueue		= ohci_urb_enqueue,
+	.urb_dequeue		= ohci_urb_dequeue,
+	.endpoint_disable	= ohci_endpoint_disable,
+
+	/*
+	 * Scheduling support.
+	 */
+	.get_frame_number	= ohci_get_frame,
+
+	/*
+	 * Root hub support.
+	 */
+	.hub_status_data	= ohci_hub_status_data,
+	.hub_control		= ohci_hub_control,
+	.start_port_reset	= ohci_start_port_reset,
+};
+
+static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd;
+	struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
+	pte_t pte = { 0 };
+	int my_cpu = smp_processor_id();
+	int ret;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	/*
+	 * Try to initialize our GXIO context; if we can't, the device
+	 * doesn't exist.
+	 */
+	if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 0) != 0)
+		return -ENXIO;
+
+	hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev,
+			     dev_name(&pdev->dev));
+	if (!hcd)
+		return -ENOMEM;
+
+	/*
+	 * We don't use rsrc_start to map in our registers, but seems like
+	 * we ought to set it to something, so we use the register VA.
+	 */
+	hcd->rsrc_start =
+		(ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
+	hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
+	hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
+
+	tilegx_start_ohc();
+
+	/* Create our IRQs and register them. */
+	pdata->irq = create_irq();
+	if (pdata->irq < 0) {
+		ret = -ENXIO;
+		goto err_no_irq;
+	}
+
+	tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
+
+	/* Configure interrupts. */
+	ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
+					  cpu_x(my_cpu), cpu_y(my_cpu),
+					  KERNEL_PL, pdata->irq);
+	if (ret) {
+		ret = -ENXIO;
+		goto err_have_irq;
+	}
+
+	/* Register all of our memory. */
+	pte = pte_set_home(pte, PAGE_HOME_HASH);
+	ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
+	if (ret) {
+		ret = -ENXIO;
+		goto err_have_irq;
+	}
+
+	ohci_hcd_init(hcd_to_ohci(hcd));
+
+	ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
+	if (ret == 0) {
+		platform_set_drvdata(pdev, hcd);
+		return ret;
+	}
+
+err_have_irq:
+	destroy_irq(pdata->irq);
+err_no_irq:
+	tilegx_stop_ohc();
+	usb_put_hcd(hcd);
+	gxio_usb_host_destroy(&pdata->usb_ctx);
+	return ret;
+}
+
+static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct tilegx_usb_platform_data* pdata = pdev->dev.platform_data;
+
+	usb_remove_hcd(hcd);
+	usb_put_hcd(hcd);
+	tilegx_stop_ohc();
+	gxio_usb_host_destroy(&pdata->usb_ctx);
+	destroy_irq(pdata->irq);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
+{
+	usb_hcd_platform_shutdown(pdev);
+	ohci_hcd_tilegx_drv_remove(pdev);
+}
+
+static struct platform_driver ohci_hcd_tilegx_driver = {
+	.probe		= ohci_hcd_tilegx_drv_probe,
+	.remove		= ohci_hcd_tilegx_drv_remove,
+	.shutdown	= ohci_hcd_tilegx_drv_shutdown,
+	.driver = {
+		.name	= "tilegx-ohci",
+		.owner	= THIS_MODULE,
+	}
+};
+
+MODULE_ALIAS("platform:tilegx-ohci");

include/linux/usb/tilegx.h

···
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ *
+ * Structure to contain platform-specific data related to Tile-Gx USB
+ * controllers.
+ */
+
+#ifndef _LINUX_USB_TILEGX_H
+#define _LINUX_USB_TILEGX_H
+
+#include <gxio/usb_host.h>
+
+struct tilegx_usb_platform_data {
+	/* GXIO device index. */
+	int dev_index;
+
+	/* GXIO device context. */
+	gxio_usb_host_context_t usb_ctx;
+
+	/* Device IRQ. */
+	unsigned int irq;
+};
+
+#endif /* _LINUX_USB_TILEGX_H */

mm/bounce.c

···
 
 static mempool_t *page_pool, *isa_page_pool;
 
-#ifdef CONFIG_HIGHMEM
+#if defined(CONFIG_HIGHMEM) || defined(CONFIG_NEED_BOUNCE_POOL)
 static __init int init_emergency_pool(void)
 {
-#ifndef CONFIG_MEMORY_HOTPLUG
+#if defined(CONFIG_HIGHMEM) && !defined(CONFIG_MEMORY_HOTPLUG)
 	if (max_pfn <= max_low_pfn)
 		return 0;
 #endif
 
 	page_pool = mempool_create_page_pool(POOL_SIZE, 0);
 	BUG_ON(!page_pool);
-	printk("highmem bounce pool size: %d pages\n", POOL_SIZE);
+	printk("bounce pool size: %d pages\n", POOL_SIZE);
 
 	return 0;
 }
 
 __initcall(init_emergency_pool);
+#endif
 
+#ifdef CONFIG_HIGHMEM
 /*
  * highmem version, map in to vec
  */