Merge branches 'iommu/fixes', 'arm/tegra', 'arm/smmu', 'virtio', 'x86/vt-d', 'x86/amd', 'core' and 's390' into next

Documentation/admin-guide/kernel-parameters.txt

···
 			  forcing Dual Address Cycle for PCI cards supporting
 			  greater than 32-bit addressing.
 
-	iommu.strict=	[ARM64, X86] Configure TLB invalidation behaviour
+	iommu.strict=	[ARM64, X86, S390] Configure TLB invalidation behaviour
 			Format: { "0" | "1" }
 			0 - Lazy mode.
 			  Request that DMA unmap operations use deferred
···
 	s390_iommu=	[HW,S390]
 			Set s390 IOTLB flushing mode
 		strict
-			With strict flushing every unmap operation will result in
-			an IOTLB flush. Default is lazy flushing before reuse,
-			which is faster.
+			With strict flushing every unmap operation will result
+			in an IOTLB flush. Default is lazy flushing before
+			reuse, which is faster. Deprecated, equivalent to
+			iommu.strict=1.
 
 	s390_iommu_aperture=	[KNL,S390]
 			Specifies the size of the per device DMA address space

Documentation/devicetree/bindings/iommu/arm,smmu.yaml

···
               - qcom,sdm630-smmu-v2
               - qcom,sdm845-smmu-v2
               - qcom,sm6350-smmu-v2
+              - qcom,sm7150-smmu-v2
           - const: qcom,adreno-smmu
           - const: qcom,smmu-v2
       - description: Qcom Adreno GPUs on Google Cheza platform
···
           contains:
             enum:
               - qcom,sm6350-smmu-v2
+              - qcom,sm7150-smmu-v2
               - qcom,sm8150-smmu-500
               - qcom,sm8250-smmu-500
     then:

arch/arm/configs/multi_v7_defconfig

···
 CONFIG_OMAP_IOMMU=y
 CONFIG_OMAP_IOMMU_DEBUG=y
 CONFIG_ROCKCHIP_IOMMU=y
-CONFIG_TEGRA_IOMMU_GART=y
 CONFIG_TEGRA_IOMMU_SMMU=y
 CONFIG_EXYNOS_IOMMU=y
 CONFIG_QCOM_IOMMU=y

arch/arm/configs/tegra_defconfig

···
 CONFIG_CROS_EC=y
 CONFIG_CROS_EC_I2C=m
 CONFIG_CROS_EC_SPI=m
-CONFIG_TEGRA_IOMMU_GART=y
 CONFIG_TEGRA_IOMMU_SMMU=y
 CONFIG_ARCH_TEGRA_2x_SOC=y
 CONFIG_ARCH_TEGRA_3x_SOC=y

arch/powerpc/kernel/iommu.c

···
 /*
  * A simple iommu_ops to allow less cruft in generic VFIO code.
  */
-static int spapr_tce_blocking_iommu_attach_dev(struct iommu_domain *dom,
-					       struct device *dev)
+static int
+spapr_tce_platform_iommu_attach_dev(struct iommu_domain *platform_domain,
+				    struct device *dev)
 {
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
 	struct iommu_group *grp = iommu_group_get(dev);
 	struct iommu_table_group *table_group;
 	int ret = -EINVAL;
+
+	/* At first attach the ownership is already set */
+	if (!domain)
+		return 0;
 
 	if (!grp)
 		return -ENODEV;
···
 	return ret;
 }
 
-static void spapr_tce_blocking_iommu_set_platform_dma(struct device *dev)
-{
-	struct iommu_group *grp = iommu_group_get(dev);
-	struct iommu_table_group *table_group;
+static const struct iommu_domain_ops spapr_tce_platform_domain_ops = {
+	.attach_dev = spapr_tce_platform_iommu_attach_dev,
+};
 
-	table_group = iommu_group_get_iommudata(grp);
-	table_group->ops->release_ownership(table_group);
-}
+static struct iommu_domain spapr_tce_platform_domain = {
+	.type = IOMMU_DOMAIN_PLATFORM,
+	.ops = &spapr_tce_platform_domain_ops,
+};
 
-static const struct iommu_domain_ops spapr_tce_blocking_domain_ops = {
-	.attach_dev = spapr_tce_blocking_iommu_attach_dev,
+static struct iommu_domain spapr_tce_blocked_domain = {
+	.type = IOMMU_DOMAIN_BLOCKED,
+	/*
+	 * FIXME: SPAPR mixes blocked and platform behaviors, the blocked domain
+	 * also sets the dma_api ops
+	 */
+	.ops = &spapr_tce_platform_domain_ops,
 };
 
 static bool spapr_tce_iommu_capable(struct device *dev, enum iommu_cap cap)
···
 	}
 
 	return false;
-}
-
-static struct iommu_domain *spapr_tce_iommu_domain_alloc(unsigned int type)
-{
-	struct iommu_domain *dom;
-
-	if (type != IOMMU_DOMAIN_BLOCKED)
-		return NULL;
-
-	dom = kzalloc(sizeof(*dom), GFP_KERNEL);
-	if (!dom)
-		return NULL;
-
-	dom->ops = &spapr_tce_blocking_domain_ops;
-
-	return dom;
 }
 
 static struct iommu_device *spapr_tce_iommu_probe_device(struct device *dev)
···
 }
 
 static const struct iommu_ops spapr_tce_iommu_ops = {
+	.default_domain = &spapr_tce_platform_domain,
+	.blocked_domain = &spapr_tce_blocked_domain,
 	.capable = spapr_tce_iommu_capable,
-	.domain_alloc = spapr_tce_iommu_domain_alloc,
 	.probe_device = spapr_tce_iommu_probe_device,
 	.release_device = spapr_tce_iommu_release_device,
 	.device_group = spapr_tce_iommu_device_group,
-	.set_platform_dma_ops = spapr_tce_blocking_iommu_set_platform_dma,
 };
 
 static struct attribute *spapr_tce_iommu_attrs[] = {

arch/s390/include/asm/pci.h

···
 	unsigned long	*dma_table;
 	int		tlb_refresh;
 
-	spinlock_t	iommu_bitmap_lock;
-	unsigned long	*iommu_bitmap;
-	unsigned long	*lazy_bitmap;
-	unsigned long	iommu_size;
-	unsigned long	iommu_pages;
-	unsigned int	next_bit;
-
 	struct iommu_device iommu_dev;  /* IOMMU core handle */
 
 	char res_name[16];
···
 	struct zpci_fmb *fmb;
 	u16		fmb_update;	/* update interval */
 	u16		fmb_length;
-	/* software counters */
-	atomic64_t allocated_pages;
-	atomic64_t mapped_pages;
-	atomic64_t unmapped_pages;
 
 	u8		version;
 	enum pci_bus_speed max_bus_speed;

arch/s390/include/asm/pci_clp.h

···
 #define CLP_UTIL_STR_LEN	64
 #define CLP_PFIP_NR_SEGMENTS	4
 
+/* PCI function type numbers */
+#define PCI_FUNC_TYPE_ISM	0x5	/* ISM device */
+
 extern bool zpci_unique_uid;
 
 struct clp_rsp_slpc_pci {

arch/s390/include/asm/pci_dma.h

···
 #define ZPCI_TABLE_VALID_MASK		0x20
 #define ZPCI_TABLE_PROT_MASK		0x200
 
-static inline unsigned int calc_rtx(dma_addr_t ptr)
-{
-	return ((unsigned long) ptr >> ZPCI_RT_SHIFT) & ZPCI_INDEX_MASK;
-}
+struct zpci_iommu_ctrs {
+	atomic64_t		mapped_pages;
+	atomic64_t		unmapped_pages;
+	atomic64_t		global_rpcits;
+	atomic64_t		sync_map_rpcits;
+	atomic64_t		sync_rpcits;
+};
 
-static inline unsigned int calc_sx(dma_addr_t ptr)
-{
-	return ((unsigned long) ptr >> ZPCI_ST_SHIFT) & ZPCI_INDEX_MASK;
-}
+struct zpci_dev;
 
-static inline unsigned int calc_px(dma_addr_t ptr)
-{
-	return ((unsigned long) ptr >> PAGE_SHIFT) & ZPCI_PT_MASK;
-}
-
-static inline void set_pt_pfaa(unsigned long *entry, phys_addr_t pfaa)
-{
-	*entry &= ZPCI_PTE_FLAG_MASK;
-	*entry |= (pfaa & ZPCI_PTE_ADDR_MASK);
-}
-
-static inline void set_rt_sto(unsigned long *entry, phys_addr_t sto)
-{
-	*entry &= ZPCI_RTE_FLAG_MASK;
-	*entry |= (sto & ZPCI_RTE_ADDR_MASK);
-	*entry |= ZPCI_TABLE_TYPE_RTX;
-}
-
-static inline void set_st_pto(unsigned long *entry, phys_addr_t pto)
-{
-	*entry &= ZPCI_STE_FLAG_MASK;
-	*entry |= (pto & ZPCI_STE_ADDR_MASK);
-	*entry |= ZPCI_TABLE_TYPE_SX;
-}
-
-static inline void validate_rt_entry(unsigned long *entry)
-{
-	*entry &= ~ZPCI_TABLE_VALID_MASK;
-	*entry &= ~ZPCI_TABLE_OFFSET_MASK;
-	*entry |= ZPCI_TABLE_VALID;
-	*entry |= ZPCI_TABLE_LEN_RTX;
-}
-
-static inline void validate_st_entry(unsigned long *entry)
-{
-	*entry &= ~ZPCI_TABLE_VALID_MASK;
-	*entry |= ZPCI_TABLE_VALID;
-}
-
-static inline void invalidate_pt_entry(unsigned long *entry)
-{
-	WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_INVALID);
-	*entry &= ~ZPCI_PTE_VALID_MASK;
-	*entry |= ZPCI_PTE_INVALID;
-}
-
-static inline void validate_pt_entry(unsigned long *entry)
-{
-	WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID);
-	*entry &= ~ZPCI_PTE_VALID_MASK;
-	*entry |= ZPCI_PTE_VALID;
-}
-
-static inline void entry_set_protected(unsigned long *entry)
-{
-	*entry &= ~ZPCI_TABLE_PROT_MASK;
-	*entry |= ZPCI_TABLE_PROTECTED;
-}
-
-static inline void entry_clr_protected(unsigned long *entry)
-{
-	*entry &= ~ZPCI_TABLE_PROT_MASK;
-	*entry |= ZPCI_TABLE_UNPROTECTED;
-}
-
-static inline int reg_entry_isvalid(unsigned long entry)
-{
-	return (entry & ZPCI_TABLE_VALID_MASK) == ZPCI_TABLE_VALID;
-}
-
-static inline int pt_entry_isvalid(unsigned long entry)
-{
-	return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID;
-}
-
-static inline unsigned long *get_rt_sto(unsigned long entry)
-{
-	if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX)
-		return phys_to_virt(entry & ZPCI_RTE_ADDR_MASK);
-	else
-		return NULL;
-
-}
-
-static inline unsigned long *get_st_pto(unsigned long entry)
-{
-	if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_SX)
-		return phys_to_virt(entry & ZPCI_STE_ADDR_MASK);
-	else
-		return NULL;
-}
-
-/* Prototypes */
-void dma_free_seg_table(unsigned long);
-unsigned long *dma_alloc_cpu_table(gfp_t gfp);
-void dma_cleanup_tables(unsigned long *);
-unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr,
-				  gfp_t gfp);
-void dma_update_cpu_trans(unsigned long *entry, phys_addr_t page_addr, int flags);
-
-extern const struct dma_map_ops s390_pci_dma_ops;
-
+struct zpci_iommu_ctrs *zpci_get_iommu_ctrs(struct zpci_dev *zdev);
 
 #endif

arch/s390/pci/Makefile

···
 # Makefile for the s390 PCI subsystem.
 #
 
-obj-$(CONFIG_PCI)	+= pci.o pci_irq.o pci_dma.o pci_clp.o pci_sysfs.o \
+obj-$(CONFIG_PCI)	+= pci.o pci_irq.o pci_clp.o pci_sysfs.o \
 			   pci_event.o pci_debug.o pci_insn.o pci_mmio.o \
 			   pci_bus.o pci_kvm_hook.o
 obj-$(CONFIG_PCI_IOV)	+= pci_iov.o

arch/s390/pci/pci.c

···
 
 	WARN_ON_ONCE(iota & 0x3fff);
 	fib.pba = base;
-	fib.pal = limit;
+	/* Work around off by one in ISM virt device */
+	if (zdev->pft == PCI_FUNC_TYPE_ISM && limit > base)
+		fib.pal = limit + (1 << 12);
+	else
+		fib.pal = limit;
 	fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
 	fib.gd = zdev->gisa;
 	cc = zpci_mod_fc(req, &fib, status);
···
 int zpci_fmb_enable_device(struct zpci_dev *zdev)
 {
 	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
+	struct zpci_iommu_ctrs *ctrs;
 	struct zpci_fib fib = {0};
 	u8 cc, status;
 
···
 	WARN_ON((u64) zdev->fmb & 0xf);
 
 	/* reset software counters */
-	atomic64_set(&zdev->allocated_pages, 0);
-	atomic64_set(&zdev->mapped_pages, 0);
-	atomic64_set(&zdev->unmapped_pages, 0);
+	ctrs = zpci_get_iommu_ctrs(zdev);
+	if (ctrs) {
+		atomic64_set(&ctrs->mapped_pages, 0);
+		atomic64_set(&ctrs->unmapped_pages, 0);
+		atomic64_set(&ctrs->global_rpcits, 0);
+		atomic64_set(&ctrs->sync_map_rpcits, 0);
+		atomic64_set(&ctrs->sync_rpcits, 0);
+	}
+
 
 	fib.fmb_addr = virt_to_phys(zdev->fmb);
 	fib.gd = zdev->gisa;
···
 		pdev->no_vf_scan = 1;
 
 	pdev->dev.groups = zpci_attr_groups;
-	pdev->dev.dma_ops = &s390_pci_dma_ops;
 	zpci_map_resources(pdev);
 
 	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
···
 	if (zdev->dma_table)
 		rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
 					virt_to_phys(zdev->dma_table), &status);
-	else
-		rc = zpci_dma_init_device(zdev);
 	if (rc) {
 		zpci_disable_device(zdev);
 		return rc;
···
 	if (zdev->zbus->bus)
 		zpci_bus_remove_device(zdev, false);
 
-	if (zdev->dma_table) {
-		rc = zpci_dma_exit_device(zdev);
-		if (rc)
-			return rc;
-	}
 	if (zdev_enabled(zdev)) {
 		rc = zpci_disable_device(zdev);
 		if (rc)
···
 	if (zdev->zbus->bus)
 		zpci_bus_remove_device(zdev, false);
 
-	if (zdev->dma_table)
-		zpci_dma_exit_device(zdev);
 	if (zdev_enabled(zdev))
 		zpci_disable_device(zdev);
 
···
 	if (rc)
 		goto out_irq;
 
-	rc = zpci_dma_init();
-	if (rc)
-		goto out_dma;
-
 	rc = clp_scan_pci_devices();
 	if (rc)
 		goto out_find;
···
 	return 0;
 
 out_find:
-	zpci_dma_exit();
-out_dma:
 	zpci_irq_exit();
 out_irq:
 	zpci_mem_exit();

arch/s390/pci/pci_bus.c

···
 		rc = zpci_enable_device(zdev);
 		if (rc)
 			return rc;
-		rc = zpci_dma_init_device(zdev);
-		if (rc) {
-			zpci_disable_device(zdev);
-			return rc;
-		}
 	}
 
 	if (!zdev->has_resources) {

arch/s390/pci/pci_debug.c

···
 };
 
 static char *pci_sw_names[] = {
-	"Allocated pages",
 	"Mapped pages",
 	"Unmapped pages",
+	"Global RPCITs",
+	"Sync Map RPCITs",
+	"Sync RPCITs",
 };
 
 static void pci_fmb_show(struct seq_file *m, char *name[], int length,
···
 
 static void pci_sw_counter_show(struct seq_file *m)
 {
-	struct zpci_dev *zdev = m->private;
-	atomic64_t *counter = &zdev->allocated_pages;
+	struct zpci_iommu_ctrs  *ctrs = zpci_get_iommu_ctrs(m->private);
+	atomic64_t *counter;
 	int i;
 
+	if (!ctrs)
+		return;
+
+	counter = &ctrs->mapped_pages;
 	for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
 		seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
 			   atomic64_read(counter));

arch/s390/pci/pci_dma.c

···
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright IBM Corp. 2012
- *
- * Author(s):
- *   Jan Glauber <[e-mail]>
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-#include <linux/iommu-helper.h>
-#include <linux/dma-map-ops.h>
-#include <linux/vmalloc.h>
-#include <linux/pci.h>
-#include <asm/pci_dma.h>
-
-static struct kmem_cache *dma_region_table_cache;
-static struct kmem_cache *dma_page_table_cache;
-static int s390_iommu_strict;
-static u64 s390_iommu_aperture;
-static u32 s390_iommu_aperture_factor = 1;
-
-static int zpci_refresh_global(struct zpci_dev *zdev)
-{
-	return zpci_refresh_trans((u64) zdev->fh << 32, zdev->start_dma,
-				  zdev->iommu_pages * PAGE_SIZE);
-}
-
-unsigned long *dma_alloc_cpu_table(gfp_t gfp)
-{
-	unsigned long *table, *entry;
-
-	table = kmem_cache_alloc(dma_region_table_cache, gfp);
-	if (!table)
-		return NULL;
-
-	for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++)
-		*entry = ZPCI_TABLE_INVALID;
-	return table;
-}
-
-static void dma_free_cpu_table(void *table)
-{
-	kmem_cache_free(dma_region_table_cache, table);
-}
-
-static unsigned long *dma_alloc_page_table(gfp_t gfp)
-{
-	unsigned long *table, *entry;
-
-	table = kmem_cache_alloc(dma_page_table_cache, gfp);
-	if (!table)
-		return NULL;
-
-	for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++)
-		*entry = ZPCI_PTE_INVALID;
-	return table;
-}
-
-static void dma_free_page_table(void *table)
-{
-	kmem_cache_free(dma_page_table_cache, table);
-}
-
-static unsigned long *dma_get_seg_table_origin(unsigned long *rtep, gfp_t gfp)
-{
-	unsigned long old_rte, rte;
-	unsigned long *sto;
-
-	rte = READ_ONCE(*rtep);
-	if (reg_entry_isvalid(rte)) {
-		sto = get_rt_sto(rte);
-	} else {
-		sto = dma_alloc_cpu_table(gfp);
-		if (!sto)
-			return NULL;
-
-		set_rt_sto(&rte, virt_to_phys(sto));
-		validate_rt_entry(&rte);
-		entry_clr_protected(&rte);
-
-		old_rte = cmpxchg(rtep, ZPCI_TABLE_INVALID, rte);
-		if (old_rte != ZPCI_TABLE_INVALID) {
-			/* Somone else was faster, use theirs */
-			dma_free_cpu_table(sto);
-			sto = get_rt_sto(old_rte);
-		}
-	}
-	return sto;
-}
-
-static unsigned long *dma_get_page_table_origin(unsigned long *step, gfp_t gfp)
-{
-	unsigned long old_ste, ste;
-	unsigned long *pto;
-
-	ste = READ_ONCE(*step);
-	if (reg_entry_isvalid(ste)) {
-		pto = get_st_pto(ste);
-	} else {
-		pto = dma_alloc_page_table(gfp);
-		if (!pto)
-			return NULL;
-		set_st_pto(&ste, virt_to_phys(pto));
-		validate_st_entry(&ste);
-		entry_clr_protected(&ste);
-
-		old_ste = cmpxchg(step, ZPCI_TABLE_INVALID, ste);
-		if (old_ste != ZPCI_TABLE_INVALID) {
-			/* Somone else was faster, use theirs */
-			dma_free_page_table(pto);
-			pto = get_st_pto(old_ste);
-		}
-	}
-	return pto;
-}
-
-unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr,
-				  gfp_t gfp)
-{
-	unsigned long *sto, *pto;
-	unsigned int rtx, sx, px;
-
-	rtx = calc_rtx(dma_addr);
-	sto = dma_get_seg_table_origin(&rto[rtx], gfp);
-	if (!sto)
-		return NULL;
-
-	sx = calc_sx(dma_addr);
-	pto = dma_get_page_table_origin(&sto[sx], gfp);
-	if (!pto)
-		return NULL;
-
-	px = calc_px(dma_addr);
-	return &pto[px];
-}
-
-void dma_update_cpu_trans(unsigned long *ptep, phys_addr_t page_addr, int flags)
-{
-	unsigned long pte;
-
-	pte = READ_ONCE(*ptep);
-	if (flags & ZPCI_PTE_INVALID) {
-		invalidate_pt_entry(&pte);
-	} else {
-		set_pt_pfaa(&pte, page_addr);
-		validate_pt_entry(&pte);
-	}
-
-	if (flags & ZPCI_TABLE_PROTECTED)
-		entry_set_protected(&pte);
-	else
-		entry_clr_protected(&pte);
-
-	xchg(ptep, pte);
-}
-
-static int __dma_update_trans(struct zpci_dev *zdev, phys_addr_t pa,
-			      dma_addr_t dma_addr, size_t size, int flags)
-{
-	unsigned int nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	phys_addr_t page_addr = (pa & PAGE_MASK);
-	unsigned long *entry;
-	int i, rc = 0;
-
-	if (!nr_pages)
-		return -EINVAL;
-
-	if (!zdev->dma_table)
-		return -EINVAL;
-
-	for (i = 0; i < nr_pages; i++) {
-		entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr,
-					   GFP_ATOMIC);
-		if (!entry) {
-			rc = -ENOMEM;
-			goto undo_cpu_trans;
-		}
-		dma_update_cpu_trans(entry, page_addr, flags);
-		page_addr += PAGE_SIZE;
-		dma_addr += PAGE_SIZE;
-	}
-
-undo_cpu_trans:
-	if (rc && ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID)) {
-		flags = ZPCI_PTE_INVALID;
-		while (i-- > 0) {
-			page_addr -= PAGE_SIZE;
-			dma_addr -= PAGE_SIZE;
-			entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr,
-						   GFP_ATOMIC);
-			if (!entry)
-				break;
-			dma_update_cpu_trans(entry, page_addr, flags);
-		}
-	}
-	return rc;
-}
-
-static int __dma_purge_tlb(struct zpci_dev *zdev, dma_addr_t dma_addr,
-			   size_t size, int flags)
-{
-	unsigned long irqflags;
-	int ret;
-
-	/*
-	 * With zdev->tlb_refresh == 0, rpcit is not required to establish new
-	 * translations when previously invalid translation-table entries are
-	 * validated. With lazy unmap, rpcit is skipped for previously valid
-	 * entries, but a global rpcit is then required before any address can
-	 * be re-used, i.e. after each iommu bitmap wrap-around.
-	 */
-	if ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID) {
-		if (!zdev->tlb_refresh)
-			return 0;
-	} else {
-		if (!s390_iommu_strict)
-			return 0;
-	}
-
-	ret = zpci_refresh_trans((u64) zdev->fh << 32, dma_addr,
-				 PAGE_ALIGN(size));
-	if (ret == -ENOMEM && !s390_iommu_strict) {
-		/* enable the hypervisor to free some resources */
-		if (zpci_refresh_global(zdev))
-			goto out;
-
-		spin_lock_irqsave(&zdev->iommu_bitmap_lock, irqflags);
-		bitmap_andnot(zdev->iommu_bitmap, zdev->iommu_bitmap,
-			      zdev->lazy_bitmap, zdev->iommu_pages);
-		bitmap_zero(zdev->lazy_bitmap, zdev->iommu_pages);
-		spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, irqflags);
-		ret = 0;
-	}
-out:
-	return ret;
-}
-
-static int dma_update_trans(struct zpci_dev *zdev, phys_addr_t pa,
-			    dma_addr_t dma_addr, size_t size, int flags)
-{
-	int rc;
-
-	rc = __dma_update_trans(zdev, pa, dma_addr, size, flags);
-	if (rc)
-		return rc;
-
-	rc = __dma_purge_tlb(zdev, dma_addr, size, flags);
-	if (rc && ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID))
-		__dma_update_trans(zdev, pa, dma_addr, size, ZPCI_PTE_INVALID);
-
-	return rc;
-}
-
-void dma_free_seg_table(unsigned long entry)
-{
-	unsigned long *sto = get_rt_sto(entry);
-	int sx;
-
-	for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++)
-		if (reg_entry_isvalid(sto[sx]))
-			dma_free_page_table(get_st_pto(sto[sx]));
-
-	dma_free_cpu_table(sto);
-}
-
-void dma_cleanup_tables(unsigned long *table)
-{
-	int rtx;
-
-	if (!table)
-		return;
-
-	for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
-		if (reg_entry_isvalid(table[rtx]))
-			dma_free_seg_table(table[rtx]);
-
-	dma_free_cpu_table(table);
-}
-
-static unsigned long __dma_alloc_iommu(struct device *dev,
-				       unsigned long start, int size)
-{
-	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-
-	return iommu_area_alloc(zdev->iommu_bitmap, zdev->iommu_pages,
-				start, size, zdev->start_dma >> PAGE_SHIFT,
-				dma_get_seg_boundary_nr_pages(dev, PAGE_SHIFT),
-				0);
-}
-
-static dma_addr_t dma_alloc_address(struct device *dev, int size)
-{
-	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-	unsigned long offset, flags;
-
-	spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
-	offset = __dma_alloc_iommu(dev, zdev->next_bit, size);
-	if (offset == -1) {
-		if (!s390_iommu_strict) {
-			/* global flush before DMA addresses are reused */
-			if (zpci_refresh_global(zdev))
-				goto out_error;
-
-			bitmap_andnot(zdev->iommu_bitmap, zdev->iommu_bitmap,
-				      zdev->lazy_bitmap, zdev->iommu_pages);
-			bitmap_zero(zdev->lazy_bitmap, zdev->iommu_pages);
-		}
-		/* wrap-around */
-		offset = __dma_alloc_iommu(dev, 0, size);
-		if (offset == -1)
-			goto out_error;
-	}
-	zdev->next_bit = offset + size;
-	spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
-
-	return zdev->start_dma + offset * PAGE_SIZE;
-
-out_error:
-	spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
-	return DMA_MAPPING_ERROR;
-}
-
-static void dma_free_address(struct device *dev, dma_addr_t dma_addr, int size)
-{
-	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-	unsigned long flags, offset;
-
-	offset = (dma_addr - zdev->start_dma) >> PAGE_SHIFT;
-
-	spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
-	if (!zdev->iommu_bitmap)
-		goto out;
-
-	if (s390_iommu_strict)
-		bitmap_clear(zdev->iommu_bitmap, offset, size);
-	else
-		bitmap_set(zdev->lazy_bitmap, offset, size);
-
-out:
-	spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
-}
-
-static inline void zpci_err_dma(unsigned long rc, unsigned long addr)
-{
-	struct {
-		unsigned long rc;
-		unsigned long addr;
-	} __packed data = {rc, addr};
-
-	zpci_err_hex(&data, sizeof(data));
-}
-
-static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
-				     unsigned long offset, size_t size,
-				     enum dma_data_direction direction,
-				     unsigned long attrs)
-{
-	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-	unsigned long pa = page_to_phys(page) + offset;
-	int flags = ZPCI_PTE_VALID;
-	unsigned long nr_pages;
-	dma_addr_t dma_addr;
-	int ret;
-
-	/* This rounds up number of pages based on size and offset */
-	nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
-	dma_addr = dma_alloc_address(dev, nr_pages);
-	if (dma_addr == DMA_MAPPING_ERROR) {
-		ret = -ENOSPC;
-		goto out_err;
-	}
-
-	/* Use rounded up size */
-	size = nr_pages * PAGE_SIZE;
-
-	if (direction == DMA_NONE || direction == DMA_TO_DEVICE)
-		flags |= ZPCI_TABLE_PROTECTED;
-
-	ret = dma_update_trans(zdev, pa, dma_addr, size, flags);
-	if (ret)
-		goto out_free;
-
-	atomic64_add(nr_pages, &zdev->mapped_pages);
-	return dma_addr + (offset & ~PAGE_MASK);
-
-out_free:
-	dma_free_address(dev, dma_addr, nr_pages);
-out_err:
-	zpci_err("map error:\n");
-	zpci_err_dma(ret, pa);
-	return DMA_MAPPING_ERROR;
-}
-
-static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
-				 size_t size, enum dma_data_direction direction,
-				 unsigned long attrs)
-{
-	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-	int npages, ret;
-
-	npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
-	dma_addr = dma_addr & PAGE_MASK;
-	ret = dma_update_trans(zdev, 0, dma_addr, npages * PAGE_SIZE,
-			       ZPCI_PTE_INVALID);
-	if (ret) {
-		zpci_err("unmap error:\n");
-		zpci_err_dma(ret, dma_addr);
-		return;
-	}
-
-	atomic64_add(npages, &zdev->unmapped_pages);
-	dma_free_address(dev, dma_addr, npages);
-}
-
-static void *s390_dma_alloc(struct device *dev, size_t size,
-			    dma_addr_t *dma_handle, gfp_t flag,
-			    unsigned long attrs)
-{
-	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-	struct page *page;
-	phys_addr_t pa;
-	dma_addr_t map;
-
-	size = PAGE_ALIGN(size);
-	page = alloc_pages(flag | __GFP_ZERO, get_order(size));
-	if (!page)
-		return NULL;
-
-	pa = page_to_phys(page);
-	map = s390_dma_map_pages(dev, page, 0, size, DMA_BIDIRECTIONAL, 0);
-	if (dma_mapping_error(dev, map)) {
-		__free_pages(page, get_order(size));
-		return NULL;
-	}
-
-	atomic64_add(size / PAGE_SIZE, &zdev->allocated_pages);
-	if (dma_handle)
-		*dma_handle = map;
-	return phys_to_virt(pa);
-}
-
-static void s390_dma_free(struct device *dev, size_t size,
-			  void *vaddr, dma_addr_t dma_handle,
-			  unsigned long attrs)
-{
-	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-
-	size = PAGE_ALIGN(size);
-	atomic64_sub(size / PAGE_SIZE, &zdev->allocated_pages);
-	s390_dma_unmap_pages(dev, dma_handle, size, DMA_BIDIRECTIONAL, 0);
-	free_pages((unsigned long)vaddr, get_order(size));
-}
-
-/* Map a segment into a contiguous dma address area */
-static int __s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
-			     size_t size, dma_addr_t *handle,
-			     enum dma_data_direction dir)
-{
-	unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
-	dma_addr_t dma_addr_base, dma_addr;
-	int flags = ZPCI_PTE_VALID;
-	struct scatterlist *s;
-	phys_addr_t pa = 0;
-	int ret;
-
-	dma_addr_base = dma_alloc_address(dev, nr_pages);
-	if (dma_addr_base == DMA_MAPPING_ERROR)
-		return -ENOMEM;
-
-	dma_addr = dma_addr_base;
-	if (dir == DMA_NONE || dir == DMA_TO_DEVICE)
-		flags |= ZPCI_TABLE_PROTECTED;
-
-	for (s = sg; dma_addr < dma_addr_base + size; s = sg_next(s)) {
-		pa = page_to_phys(sg_page(s));
-		ret = __dma_update_trans(zdev, pa, dma_addr,
-					 s->offset + s->length, flags);
-		if (ret)
-			goto unmap;
-
-		dma_addr += s->offset + s->length;
-	}
-	ret = __dma_purge_tlb(zdev, dma_addr_base, size, flags);
-	if (ret)
-		goto unmap;
-
-	*handle = dma_addr_base;
-	atomic64_add(nr_pages, &zdev->mapped_pages);
-
-	return ret;
-
-unmap:
-	dma_update_trans(zdev, 0, dma_addr_base, dma_addr - dma_addr_base,
-			 ZPCI_PTE_INVALID);
-	dma_free_address(dev, dma_addr_base, nr_pages);
-	zpci_err("map error:\n");
-	zpci_err_dma(ret, pa);
-	return ret;
-}
-
-static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
-			   int nr_elements, enum dma_data_direction dir,
-			   unsigned long attrs)
-{
-	struct scatterlist *s = sg, *start = sg, *dma = sg;
-	unsigned int max = dma_get_max_seg_size(dev);
-	unsigned int size = s->offset + s->length;
-	unsigned int offset = s->offset;
-	int count = 0, i, ret;
-
-	for (i = 1; i < nr_elements; i++) {
-		s = sg_next(s);
-
-		s->dma_length = 0;
-
-		if (s->offset || (size & ~PAGE_MASK) ||
-		    size + s->length > max) {
-			ret = __s390_dma_map_sg(dev, start, size,
-						&dma->dma_address, dir);
-			if (ret)
-				goto unmap;
-
-			dma->dma_address += offset;
-			dma->dma_length = size - offset;
-
-			size = offset = s->offset;
-			start = s;
-			dma = sg_next(dma);
-			count++;
-		}
-		size += s->length;
-	}
-	ret = __s390_dma_map_sg(dev, start, size, &dma->dma_address, dir);
-	if (ret)
-		goto unmap;
-
-	dma->dma_address += offset;
-	dma->dma_length = size - offset;
-
-	return count + 1;
-unmap:
-	for_each_sg(sg, s, count, i)
-		s390_dma_unmap_pages(dev, sg_dma_address(s), sg_dma_len(s),
-				     dir, attrs);
-
-	return ret;
-}
-
-static void s390_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
-			      int nr_elements, enum dma_data_direction dir,
-			      unsigned long attrs)
-{
-	struct scatterlist *s;
-	int i;
-
-	for_each_sg(sg, s, nr_elements, i) {
-		if (s->dma_length)
-			s390_dma_unmap_pages(dev, s->dma_address, s->dma_length,
-					     dir, attrs);
-		s->dma_address = 0;
-		s->dma_length = 0;
-	}
-}
-
-static unsigned long *bitmap_vzalloc(size_t bits, gfp_t flags)
-{
-	size_t n = BITS_TO_LONGS(bits);
-	size_t bytes;
-
-	if (unlikely(check_mul_overflow(n, sizeof(unsigned long), &bytes)))
-		return NULL;
-
-	return vzalloc(bytes);
-}
-	
-int zpci_dma_init_device(struct zpci_dev *zdev)
-{
-	u8 status;
-	int rc;
-
-	/*
-	 * At this point, if the device is part of an IOMMU domain, this would
-	 * be a strong hint towards a bug in the IOMMU API (common) code and/or
-	 * simultaneous access via IOMMU and DMA API. So let's issue a warning.
-	 */
-	WARN_ON(zdev->s390_domain);
-
-	spin_lock_init(&zdev->iommu_bitmap_lock);
-
-	zdev->dma_table = dma_alloc_cpu_table(GFP_KERNEL);
-	if (!zdev->dma_table) {
-		rc = -ENOMEM;
-		goto out;
-	}
-
-	/*
-	 * Restrict the iommu bitmap size to the minimum of the following:
-	 * - s390_iommu_aperture which defaults to high_memory
-	 * - 3-level pagetable address limit minus start_dma offset
-	 * - DMA address range allowed by the hardware (clp query pci fn)
-	 *
-	 * Also set zdev->end_dma to the actual end address of the usable
-	 * range, instead of the theoretical maximum as reported by hardware.
-	 *
-	 * This limits the number of concurrently usable DMA mappings since
-	 * for each DMA mapped memory address we need a DMA address including
-	 * extra DMA addresses for multiple mappings of the same memory address.
-	 */
-	zdev->start_dma = PAGE_ALIGN(zdev->start_dma);
-	zdev->iommu_size = min3(s390_iommu_aperture,
-				ZPCI_TABLE_SIZE_RT - zdev->start_dma,
-				zdev->end_dma - zdev->start_dma + 1);
-	zdev->end_dma = zdev->start_dma + zdev->iommu_size - 1;
-	zdev->iommu_pages = zdev->iommu_size >> PAGE_SHIFT;
-	zdev->iommu_bitmap = bitmap_vzalloc(zdev->iommu_pages, GFP_KERNEL);
-	if (!zdev->iommu_bitmap) {
-		rc = -ENOMEM;
-		goto free_dma_table;
-	}
-	if (!s390_iommu_strict) {
-		zdev->lazy_bitmap = bitmap_vzalloc(zdev->iommu_pages, GFP_KERNEL);
-		if (!zdev->lazy_bitmap) {
-			rc = -ENOMEM;
-			goto free_bitmap;
-		}
-
-	}
-	if (zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
-			       virt_to_phys(zdev->dma_table), &status)) {
-		rc = -EIO;
-		goto free_bitmap;
-	}
-
-	return 0;
-free_bitmap:
-	vfree(zdev->iommu_bitmap);
-	zdev->iommu_bitmap = NULL;
-	vfree(zdev->lazy_bitmap);
-	zdev->lazy_bitmap = NULL;
-free_dma_table:
-	dma_free_cpu_table(zdev->dma_table);
-	zdev->dma_table = NULL;
-out:
-	return rc;
-}
-
-int zpci_dma_exit_device(struct zpci_dev *zdev)
-{
-	int cc = 0;
-
-	/*
-	 * At this point, if the device is part of an IOMMU domain, this would
-	 * be a strong hint towards a bug in the IOMMU API (common) code and/or
-	 * simultaneous access via IOMMU and DMA API. So let's issue a warning.
-	 */
-	WARN_ON(zdev->s390_domain);
-	if (zdev_enabled(zdev))
-		cc = zpci_unregister_ioat(zdev, 0);
-	/*
-	 * cc == 3 indicates the function is gone already. This can happen
-	 * if the function was deconfigured/disabled suddenly and we have not
-	 * received a new handle yet.
-	 */
-	if (cc && cc != 3)
-		return -EIO;
-
-	dma_cleanup_tables(zdev->dma_table);
-	zdev->dma_table = NULL;
-	vfree(zdev->iommu_bitmap);
-	zdev->iommu_bitmap = NULL;
-	vfree(zdev->lazy_bitmap);
-	zdev->lazy_bitmap = NULL;
-	zdev->next_bit = 0;
-	return 0;
-}
-
-static int __init dma_alloc_cpu_table_caches(void)
-{
-	dma_region_table_cache = kmem_cache_create("PCI_DMA_region_tables",
-					ZPCI_TABLE_SIZE, ZPCI_TABLE_ALIGN,
-					0, NULL);
-	if (!dma_region_table_cache)
-		return -ENOMEM;
-
-	dma_page_table_cache = kmem_cache_create("PCI_DMA_page_tables",
-					ZPCI_PT_SIZE, ZPCI_PT_ALIGN,
-					0, NULL);
-	if (!dma_page_table_cache) {
-		kmem_cache_destroy(dma_region_table_cache);
-		return -ENOMEM;
-	}
-	return 0;
-}
-
-int __init zpci_dma_init(void)
-{
-	s390_iommu_aperture = (u64)virt_to_phys(high_memory);
-	if (!s390_iommu_aperture_factor)
-		s390_iommu_aperture = ULONG_MAX;
-	else
-		s390_iommu_aperture *= s390_iommu_aperture_factor;
-
-	return dma_alloc_cpu_table_caches();
-}
-
-void zpci_dma_exit(void)
-{
-	kmem_cache_destroy(dma_page_table_cache);
-	kmem_cache_destroy(dma_region_table_cache);
-}
-
-const struct dma_map_ops s390_pci_dma_ops = {
-	.alloc		= s390_dma_alloc,
-	.free		= s390_dma_free,
-	.map_sg		= s390_dma_map_sg,
-	.unmap_sg	= s390_dma_unmap_sg,
-	.map_page	= s390_dma_map_pages,
-	.unmap_page	= s390_dma_unmap_pages,
-	.mmap		= dma_common_mmap,
-	.get_sgtable	= dma_common_get_sgtable,
-	.alloc_pages	= dma_common_alloc_pages,
-	.free_pages	= dma_common_free_pages,
-	/* dma_supported is unconditionally true without a callback */
-};
-EXPORT_SYMBOL_GPL(s390_pci_dma_ops);
-
-static int __init s390_iommu_setup(char *str)
-{
-	if (!strcmp(str, "strict"))
-		s390_iommu_strict = 1;
-	return 1;
-}
-
-__setup("s390_iommu=", s390_iommu_setup);
-
-static int __init s390_iommu_aperture_setup(char *str)
-{
-	if (kstrtou32(str, 10, &s390_iommu_aperture_factor))
-		s390_iommu_aperture_factor = 1;
-	return 1;
-}
-
-__setup("s390_iommu_aperture=", s390_iommu_aperture_setup);

arch/s390/pci/pci_event.c

···
 	}
 }
 
-static bool is_passed_through(struct zpci_dev *zdev)
+static bool is_passed_through(struct pci_dev *pdev)
 {
-	return zdev->s390_domain;
+	struct zpci_dev *zdev = to_zpci(pdev);
+	bool ret;
+
+	mutex_lock(&zdev->kzdev_lock);
+	ret = !!zdev->kzdev;
+	mutex_unlock(&zdev->kzdev_lock);
+
+	return ret;
 }
 
 static bool is_driver_supported(struct pci_driver *driver)
···
 	}
 	pdev->error_state = pci_channel_io_frozen;
 
-	if (is_passed_through(to_zpci(pdev))) {
+	if (is_passed_through(pdev)) {
 		pr_info("%s: Cannot be recovered in the host because it is a pass-through device\n",
 			pci_name(pdev));
 		goto out_unlock;
···
 	 * we will inject the error event and let the guest recover the device
 	 * itself.
 	 */
-	if (is_passed_through(to_zpci(pdev)))
+	if (is_passed_through(pdev))
 		goto out;
 	driver = to_pci_driver(pdev->dev.driver);
 	if (driver && driver->err_handler && driver->err_handler->error_detected)
···
 	/* Even though the device is already gone we still
 	 * need to free zPCI resources as part of the disable.
 	 */
-	if (zdev->dma_table)
-		zpci_dma_exit_device(zdev);
 	if (zdev_enabled(zdev))
 		zpci_disable_device(zdev);
 	zdev->state = ZPCI_FN_STATE_STANDBY;

arch/s390/pci/pci_sysfs.c

···
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct zpci_dev *zdev = to_zpci(pdev);
 	int ret = 0;
+	u8 status;
 
 	/* Can't use device_remove_self() here as that would lead us to lock
 	 * the pci_rescan_remove_lock while holding the device' kernfs lock.
···
 	pci_lock_rescan_remove();
 	if (pci_dev_is_added(pdev)) {
 		pci_stop_and_remove_bus_device(pdev);
-		if (zdev->dma_table) {
-			ret = zpci_dma_exit_device(zdev);
-			if (ret)
-				goto out;
-		}
-
 		if (zdev_enabled(zdev)) {
 			ret = zpci_disable_device(zdev);
 			/*
···
 		ret = zpci_enable_device(zdev);
 		if (ret)
 			goto out;
-		ret = zpci_dma_init_device(zdev);
-		if (ret) {
-			zpci_disable_device(zdev);
-			goto out;
+
+		if (zdev->dma_table) {
+			ret = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
+						 virt_to_phys(zdev->dma_table), &status);
+			if (ret)
+				zpci_disable_device(zdev);
 		}
-		pci_rescan_bus(zdev->zbus->bus);
 	}
 out:
+	pci_rescan_bus(zdev->zbus->bus);
 	pci_unlock_rescan_remove();
 	if (kn)
 		sysfs_unbreak_active_protection(kn);

drivers/iommu/Kconfig

···
 choice
 	prompt "IOMMU default domain type"
 	depends on IOMMU_API
-	default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64
+	default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64 || S390
 	default IOMMU_DEFAULT_DMA_STRICT
 	help
 	  Choose the type of IOMMU domain used to manage DMA API usage by
···
 
 # IOMMU-agnostic DMA-mapping layer
 config IOMMU_DMA
-	def_bool ARM64 || IA64 || X86
+	def_bool ARM64 || IA64 || X86 || S390
 	select DMA_OPS
 	select IOMMU_API
 	select IOMMU_IOVA
···
 	select IOMMU_API
 	help
 	  Support for the IOMMU introduced in the Allwinner H6 SoCs.
-
-config TEGRA_IOMMU_GART
-	bool "Tegra GART IOMMU Support"
-	depends on ARCH_TEGRA_2x_SOC
-	depends on TEGRA_MC
-	select IOMMU_API
-	help
-	  Enables support for remapping discontiguous physical memory
-	  shared with the operating system into contiguous I/O virtual
-	  space through the GART (Graphics Address Relocation Table)
-	  hardware included on Tegra SoCs.
 
 config TEGRA_IOMMU_SMMU
 	bool "NVIDIA Tegra SMMU Support"

drivers/iommu/Makefile

···
 obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o
 obj-$(CONFIG_ROCKCHIP_IOMMU) += rockchip-iommu.o
 obj-$(CONFIG_SUN50I_IOMMU) += sun50i-iommu.o
-obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
 obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
 obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o
 obj-$(CONFIG_FSL_PAMU) += fsl_pamu.o fsl_pamu_domain.o

drivers/iommu/amd/Kconfig

···
 	  your BIOS for an option to enable it or if you have an IVRS ACPI
 	  table.
 
-config AMD_IOMMU_V2
-	tristate "AMD IOMMU Version 2 driver"
-	depends on AMD_IOMMU
-	select MMU_NOTIFIER
-	help
-	  This option enables support for the AMD IOMMUv2 features of the IOMMU
-	  hardware. Select this option if you want to use devices that support
-	  the PCI PRI and PASID interface.
-
 config AMD_IOMMU_DEBUGFS
 	bool "Enable AMD IOMMU internals in DebugFS"
 	depends on AMD_IOMMU && IOMMU_DEBUGFS

drivers/iommu/amd/Makefile

···
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_AMD_IOMMU) += iommu.o init.o quirks.o io_pgtable.o io_pgtable_v2.o
 obj-$(CONFIG_AMD_IOMMU_DEBUGFS) += debugfs.o
-obj-$(CONFIG_AMD_IOMMU_V2) += iommu_v2.o

drivers/iommu/amd/amd_iommu.h

···
 extern enum io_pgtable_fmt amd_iommu_pgtable;
 extern int amd_iommu_gpt_level;
 
-/* IOMMUv2 specific functions */
-struct iommu_domain;
-
 bool amd_iommu_v2_supported(void);
 struct amd_iommu *get_amd_iommu(unsigned int idx);
 u8 amd_iommu_pc_get_max_banks(unsigned int idx);
···
 int amd_iommu_pc_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
 			 u8 fxn, u64 *value);
 
-int amd_iommu_register_ppr_notifier(struct notifier_block *nb);
-int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb);
-void amd_iommu_domain_direct_map(struct iommu_domain *dom);
-int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids);
+/* Device capabilities */
+int amd_iommu_pdev_enable_cap_pri(struct pci_dev *pdev);
+void amd_iommu_pdev_disable_cap_pri(struct pci_dev *pdev);
+
 int amd_iommu_flush_page(struct iommu_domain *dom, u32 pasid, u64 address);
 void amd_iommu_update_and_flush_device_table(struct protection_domain *domain);
 void amd_iommu_domain_update(struct protection_domain *domain);
···
 	       (pdev->device == PCI_DEVICE_ID_RD890_IOMMU);
 }
 
-static inline bool iommu_feature(struct amd_iommu *iommu, u64 mask)
+static inline bool check_feature(u64 mask)
 {
-	return !!(iommu->features & mask);
+	return (amd_iommu_efr & mask);
+}
+
+static inline bool check_feature2(u64 mask)
+{
+	return (amd_iommu_efr2 & mask);
+}
+
+static inline int check_feature_gpt_level(void)
+{
+	return ((amd_iommu_efr >> FEATURE_GATS_SHIFT) & FEATURE_GATS_MASK);
+}
+
+static inline bool amd_iommu_gt_ppr_supported(void)
+{
+	return (check_feature(FEATURE_GT) &&
+		check_feature(FEATURE_PPR));
 }
 
 static inline u64 iommu_virt_to_phys(void *vaddr)
···
 static inline
 void amd_iommu_domain_set_pt_root(struct protection_domain *domain, u64 root)
 {
-	atomic64_set(&domain->iop.pt_root, root);
 	domain->iop.root = (u64 *)(root & PAGE_MASK);
 	domain->iop.mode = root & 7; /* lowest 3 bits encode pgtable mode */
 }
···
 void amd_iommu_domain_set_pgtable(struct protection_domain *domain,
 				  u64 *root, int mode);
 struct dev_table_entry *get_dev_table(struct amd_iommu *iommu);
-
-extern u64 amd_iommu_efr;
-extern u64 amd_iommu_efr2;
 
 extern bool amd_iommu_snp_en;
 #endif

drivers/iommu/amd/amd_iommu_types.h

···
 #define PD_IOMMUV2_MASK		BIT(3) /* domain has gcr3 table */
 #define PD_GIOV_MASK		BIT(4) /* domain enable GIOV support */
 
+/* Timeout stuff */
+#define LOOP_TIMEOUT		100000
+#define MMIO_STATUS_TIMEOUT	2000000
+
 extern bool amd_iommu_dump;
 #define DUMP_printk(format, arg...)				\
 	do {							\
···
 #define APERTURE_RANGE_INDEX(a)	((a) >> APERTURE_RANGE_SHIFT)
 #define APERTURE_PAGE_INDEX(a)	(((a) >> 21) & 0x3fULL)
 
-/*
- * This struct is used to pass information about
- * incoming PPR faults around.
- */
-struct amd_iommu_fault {
-	u64 address;    /* IO virtual address of the fault*/
-	u32 pasid;      /* Address space identifier */
-	u32 sbdf;	/* Originating PCI device id */
-	u16 tag;        /* PPR tag */
-	u16 flags;      /* Fault flags */
-
-};
-
 
 struct amd_iommu;
 struct iommu_domain;
···
 	struct io_pgtable	iop;
 	int			mode;
 	u64			*root;
-	atomic64_t		pt_root;	/* pgtable root and pgtable mode */
 	u64			*pgd;		/* v2 pgtable pgd pointer */
 };
 
···
 	/* Extended features 2 */
 	u64 features2;
 
-	/* IOMMUv2 */
-	bool is_iommu_v2;
-
 	/* PCI device id of the IOMMU device */
 	u16 devid;
 
···
 	bool cmd_line;
 };
 
+#define AMD_IOMMU_DEVICE_FLAG_ATS_SUP     0x1    /* ATS feature supported */
+#define AMD_IOMMU_DEVICE_FLAG_PRI_SUP     0x2    /* PRI feature supported */
+#define AMD_IOMMU_DEVICE_FLAG_PASID_SUP   0x4    /* PASID context supported */
+/* Device may request execution on memory pages */
+#define AMD_IOMMU_DEVICE_FLAG_EXEC_SUP    0x8
+/* Device may request super-user privileges */
+#define AMD_IOMMU_DEVICE_FLAG_PRIV_SUP   0x10
+
 /*
  * This struct contains device specific data for the IOMMU
  */
···
 	struct protection_domain *domain; /* Domain the device is bound to */
 	struct device *dev;
 	u16 devid;			  /* PCI Device ID */
-	bool iommu_v2;			  /* Device can make use of IOMMUv2 */
-	struct {
-		bool enabled;
-		int qdep;
-	} ats;				  /* ATS state */
-	bool pri_tlp;			  /* PASID TLB required for
+
+	u32 flags;			  /* Holds AMD_IOMMU_DEVICE_FLAG_<*> */
+	int ats_qdep;
+	u8 ats_enabled  :1;		  /* ATS state */
+	u8 pri_enabled  :1;		  /* PRI state */
+	u8 pasid_enabled:1;		  /* PASID state */
+	u8 pri_tlp      :1;		  /* PASID TLB required for
 					     PPR completions */
+	u8 ppr          :1;		  /* Enable device PPR support */
 	bool use_vapic;			  /* Enable device to use vapic mode */
 	bool defer_attach;
 
···
 /* allocation bitmap for domain ids */
 extern unsigned long *amd_iommu_pd_alloc_bitmap;
 
-/* Smallest max PASID supported by any IOMMU in the system */
-extern u32 amd_iommu_max_pasid;
-
-extern bool amd_iommu_v2_present;
-
 extern bool amd_iommu_force_isolation;
 
 /* Max levels of glxval supported */
 extern int amd_iommu_max_glx_val;
+
+/* Global EFR and EFR2 registers */
+extern u64 amd_iommu_efr;
+extern u64 amd_iommu_efr2;
 
 /*
  * This function flushes all internal caches of

drivers/iommu/amd/init.c

···
 #define ACPI_DEVFLAG_LINT1              0x80
 #define ACPI_DEVFLAG_ATSDIS             0x10000000
 
-#define LOOP_TIMEOUT	2000000
-
 #define IVRS_GET_SBDF_ID(seg, bus, dev, fn)	(((seg & 0xffff) << 16) | ((bus & 0xff) << 8) \
 						 | ((dev & 0x1f) << 3) | (fn & 0x7))
 
···
 bool amd_iommu_np_cache __read_mostly;
 bool amd_iommu_iotlb_sup __read_mostly = true;
 
-u32 amd_iommu_max_pasid __read_mostly = ~0;
-
-bool amd_iommu_v2_present __read_mostly;
 static bool amd_iommu_pc_present __read_mostly;
 bool amdr_ivrs_remap_support __read_mostly;
 
···
  * Iterate through all the IOMMUs to get common EFR
  * masks among all IOMMUs and warn if found inconsistency.
  */
-static void get_global_efr(void)
+static __init void get_global_efr(void)
 {
 	struct amd_iommu *iommu;
 
···
 	}
 
 	pr_info("Using global IVHD EFR:%#llx, EFR2:%#llx\n", amd_iommu_efr, amd_iommu_efr2);
-}
-
-static bool check_feature_on_all_iommus(u64 mask)
-{
-	return !!(amd_iommu_efr & mask);
-}
-
-static inline int check_feature_gpt_level(void)
-{
-	return ((amd_iommu_efr >> FEATURE_GATS_SHIFT) & FEATURE_GATS_MASK);
 }
 
 /*
···
 	u64 start = iommu_virt_to_phys((void *)iommu->cmd_sem);
 	u64 entry = start & PM_ADDR_MASK;
 
-	if (!check_feature_on_all_iommus(FEATURE_SNP))
+	if (!check_feature(FEATURE_SNP))
 		return;
 
 	/* Note:
···
 	void *buf = (void *)__get_free_pages(gfp, order);
 
 	if (buf &&
-	    check_feature_on_all_iommus(FEATURE_SNP) &&
+	    check_feature(FEATURE_SNP) &&
 	    set_memory_4k((unsigned long)buf, (1 << order))) {
 		free_pages((unsigned long)buf, order);
 		buf = NULL;
···
 	iommu_feature_enable(iommu, CONTROL_GAINT_EN);
 	iommu_feature_enable(iommu, CONTROL_GALOG_EN);
 
-	for (i = 0; i < LOOP_TIMEOUT; ++i) {
+	for (i = 0; i < MMIO_STATUS_TIMEOUT; ++i) {
 		status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
 		if (status & (MMIO_STATUS_GALOG_RUN_MASK))
 			break;
 		udelay(10);
 	}
 
-	if (WARN_ON(i >= LOOP_TIMEOUT))
+	if (WARN_ON(i >= MMIO_STATUS_TIMEOUT))
 		return -EINVAL;
 
 	return 0;
···
 
 static void iommu_enable_gt(struct amd_iommu *iommu)
 {
-	if (!iommu_feature(iommu, FEATURE_GT))
+	if (!check_feature(FEATURE_GT))
 		return;
 
 	iommu_feature_enable(iommu, CONTROL_GT_EN);
···
 	u64 val;
 	struct pci_dev *pdev = iommu->dev;
 
-	if (!iommu_feature(iommu, FEATURE_PC))
+	if (!check_feature(FEATURE_PC))
 		return;
 
 	amd_iommu_pc_present = true;
···
 				       struct device_attribute *attr,
 				       char *buf)
 {
-	struct amd_iommu *iommu = dev_to_amd_iommu(dev);
-	return sysfs_emit(buf, "%llx:%llx\n", iommu->features2, iommu->features);
+	return sysfs_emit(buf, "%llx:%llx\n", amd_iommu_efr, amd_iommu_efr2);
 }
 static DEVICE_ATTR(features, S_IRUGO, amd_iommu_show_features, NULL);
 
···
 	features = readq(iommu->mmio_base + MMIO_EXT_FEATURES);
 	features2 = readq(iommu->mmio_base + MMIO_EXT_FEATURES2);
 
-	if (!iommu->features) {
-		iommu->features = features;
-		iommu->features2 = features2;
+	if (!amd_iommu_efr) {
+		amd_iommu_efr = features;
+		amd_iommu_efr2 = features2;
 		return;
 	}
 
···
 	 * Sanity check and warn if EFR values from
 	 * IVHD and MMIO conflict.
 	 */
-	if (features != iommu->features ||
-	    features2 != iommu->features2) {
+	if (features != amd_iommu_efr ||
+	    features2 != amd_iommu_efr2) {
 		pr_warn(FW_WARN
 			"EFR mismatch. Use IVHD EFR (%#llx : %#llx), EFR2 (%#llx : %#llx).\n",
-			features, iommu->features,
-			features2, iommu->features2);
+			features, amd_iommu_efr,
+			features2, amd_iommu_efr2);
 	}
 }
 
···
 
 	late_iommu_features_init(iommu);
 
-	if (iommu_feature(iommu, FEATURE_GT)) {
+	if (check_feature(FEATURE_GT)) {
 		int glxval;
-		u32 max_pasid;
 		u64 pasmax;
 
-		pasmax = iommu->features & FEATURE_PASID_MASK;
+		pasmax = amd_iommu_efr & FEATURE_PASID_MASK;
 		pasmax >>= FEATURE_PASID_SHIFT;
-		max_pasid  = (1 << (pasmax + 1)) - 1;
+		iommu->iommu.max_pasids = (1 << (pasmax + 1)) - 1;
 
-		amd_iommu_max_pasid = min(amd_iommu_max_pasid, max_pasid);
+		BUG_ON(iommu->iommu.max_pasids & ~PASID_MASK);
 
-		BUG_ON(amd_iommu_max_pasid & ~PASID_MASK);
-
-		glxval   = iommu->features & FEATURE_GLXVAL_MASK;
+		glxval   = amd_iommu_efr & FEATURE_GLXVAL_MASK;
 		glxval >>= FEATURE_GLXVAL_SHIFT;
 
 		if (amd_iommu_max_glx_val == -1)
···
 			amd_iommu_max_glx_val = min(amd_iommu_max_glx_val, glxval);
 	}
 
-	if (iommu_feature(iommu, FEATURE_GT) &&
-	    iommu_feature(iommu, FEATURE_PPR)) {
-		iommu->is_iommu_v2   = true;
-		amd_iommu_v2_present = true;
-	}
-
-	if (iommu_feature(iommu, FEATURE_PPR) && alloc_ppr_log(iommu))
+	if (check_feature(FEATURE_PPR) && alloc_ppr_log(iommu))
 		return -ENOMEM;
 
 	if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE)) {
···
 	init_iommu_perf_ctr(iommu);
 
 	if (amd_iommu_pgtable == AMD_IOMMU_V2) {
-		if (!iommu_feature(iommu, FEATURE_GIOSUP) ||
-		    !iommu_feature(iommu, FEATURE_GT)) {
+		if (!check_feature(FEATURE_GIOSUP) ||
+		    !check_feature(FEATURE_GT)) {
 			pr_warn("Cannot enable v2 page table for DMA-API. Fallback to v1.\n");
-			amd_iommu_pgtable = AMD_IOMMU_V1;
-		} else if (iommu_default_passthrough()) {
-			pr_warn("V2 page table doesn't support passthrough mode. Fallback to v1.\n");
 			amd_iommu_pgtable = AMD_IOMMU_V1;
 		}
 	}
···
 
 static void print_iommu_info(void)
 {
+	int i;
 	static const char * const feat_str[] = {
 		"PreF", "PPR", "X2APIC", "NX", "GT", "[5]",
 		"IA", "GA", "HE", "PC"
 	};
-	struct amd_iommu *iommu;
 
-	for_each_iommu(iommu) {
-		struct pci_dev *pdev = iommu->dev;
-		int i;
+	if (amd_iommu_efr) {
+		pr_info("Extended features (%#llx, %#llx):", amd_iommu_efr, amd_iommu_efr2);
 
-		pci_info(pdev, "Found IOMMU cap 0x%x\n", iommu->cap_ptr);
-
-		if (iommu->cap & (1 << IOMMU_CAP_EFR)) {
-			pr_info("Extended features (%#llx, %#llx):", iommu->features, iommu->features2);
-
-			for (i = 0; i < ARRAY_SIZE(feat_str); ++i) {
-				if (iommu_feature(iommu, (1ULL << i)))
-					pr_cont(" %s", feat_str[i]);
-			}
-
-			if (iommu->features & FEATURE_GAM_VAPIC)
-				pr_cont(" GA_vAPIC");
-
-			if (iommu->features & FEATURE_SNP)
-				pr_cont(" SNP");
-
-			pr_cont("\n");
+		for (i = 0; i < ARRAY_SIZE(feat_str); ++i) {
+			if (check_feature(1ULL << i))
+				pr_cont(" %s", feat_str[i]);
 		}
+
+		if (check_feature(FEATURE_GAM_VAPIC))
+			pr_cont(" GA_vAPIC");
+
+		if (check_feature(FEATURE_SNP))
+			pr_cont(" SNP");
+
+		pr_cont("\n");
 	}
+
 	if (irq_remapping_enabled) {
 		pr_info("Interrupt remapping enabled\n");
 		if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
···
 		 * Need to set and poll check the GALOGRun bit to zero before
 		 * we can set/ modify GA Log registers safely.
 		 */
-		for (i = 0; i < LOOP_TIMEOUT; ++i) {
+		for (i = 0; i < MMIO_STATUS_TIMEOUT; ++i) {
 			status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
 			if (!(status & MMIO_STATUS_GALOG_RUN_MASK))
 				break;
 			udelay(10);
 		}
 
-		if (WARN_ON(i >= LOOP_TIMEOUT))
+		if (WARN_ON(i >= MMIO_STATUS_TIMEOUT))
 			return;
 	}
 
 	if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) &&
-	    !check_feature_on_all_iommus(FEATURE_GAM_VAPIC)) {
+	    !check_feature(FEATURE_GAM_VAPIC)) {
 		amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;
 		return;
 	}
···
 	 * (i.e. EFR[SNPSup]=1), IOMMUv2 page table cannot be used without
 	 * setting up IOMMUv1 page table.
 	 */
-	return amd_iommu_v2_present && !amd_iommu_snp_en;
+	return amd_iommu_gt_ppr_supported() && !amd_iommu_snp_en;
 }
-EXPORT_SYMBOL(amd_iommu_v2_supported);
 
 struct amd_iommu *get_amd_iommu(unsigned int idx)
 {
···
 		return -EINVAL;
 	}
 
-	amd_iommu_snp_en = check_feature_on_all_iommus(FEATURE_SNP);
+	amd_iommu_snp_en = check_feature(FEATURE_SNP);
 	if (!amd_iommu_snp_en)
 		return -EINVAL;
 

drivers/iommu/amd/io_pgtable_v2.c

···
 	if (!(pdom->flags & PD_IOMMUV2_MASK))
 		return;
 
-	/*
-	 * Make changes visible to IOMMUs. No need to clear gcr3 entry
-	 * as gcr3 table is already freed.
-	 */
+	/* Clear gcr3 entry */
+	amd_iommu_domain_clear_gcr3(&pdom->domain, 0);
+
+	/* Make changes visible to IOMMUs */
 	amd_iommu_domain_update(pdom);
 
 	/* Free page table */

drivers/iommu/amd/iommu.c

···
 
 #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
 
-#define LOOP_TIMEOUT	100000
-
 /* IO virtual address start page frame number */
 #define IOVA_START_PFN		(1)
 #define IOVA_PFN(addr)		((addr) >> PAGE_SHIFT)
···
 
 const struct iommu_ops amd_iommu_ops;
 
-static ATOMIC_NOTIFIER_HEAD(ppr_notifier);
 int amd_iommu_max_glx_val = -1;
 
 /*
···
 struct kmem_cache *amd_iommu_irq_cache;
 
 static void detach_device(struct device *dev);
-static int domain_enable_v2(struct protection_domain *domain, int pasids);
 
 /****************************************************************************
  *
···
 	return entry->group;
 }
 
-static bool pci_iommuv2_capable(struct pci_dev *pdev)
+static inline bool pdev_pasid_supported(struct iommu_dev_data *dev_data)
 {
-	static const int caps[] = {
-		PCI_EXT_CAP_ID_PRI,
-		PCI_EXT_CAP_ID_PASID,
-	};
-	int i, pos;
+	return (dev_data->flags & AMD_IOMMU_DEVICE_FLAG_PASID_SUP);
+}
 
-	if (!pci_ats_supported(pdev))
-		return false;
+static u32 pdev_get_caps(struct pci_dev *pdev)
+{
+	int features;
+	u32 flags = 0;
 
-	for (i = 0; i < 2; ++i) {
-		pos = pci_find_ext_capability(pdev, caps[i]);
-		if (pos == 0)
-			return false;
+	if (pci_ats_supported(pdev))
+		flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP;
+
+	if (pci_pri_supported(pdev))
+		flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP;
+
+	features = pci_pasid_features(pdev);
+	if (features >= 0) {
+		flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
+
+		if (features & PCI_PASID_CAP_EXEC)
+			flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP;
+
+		if (features & PCI_PASID_CAP_PRIV)
+			flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP;
 	}
 
-	return true;
+	return flags;
+}
+
+static inline int pdev_enable_cap_ats(struct pci_dev *pdev)
+{
+	struct iommu_dev_data *dev_data = dev_iommu_priv_get(&pdev->dev);
+	int ret = -EINVAL;
+
+	if (dev_data->ats_enabled)
+		return 0;
+
+	if (amd_iommu_iotlb_sup &&
+	    (dev_data->flags & AMD_IOMMU_DEVICE_FLAG_ATS_SUP)) {
+		ret = pci_enable_ats(pdev, PAGE_SHIFT);
+		if (!ret) {
+			dev_data->ats_enabled = 1;
+			dev_data->ats_qdep    = pci_ats_queue_depth(pdev);
+		}
+	}
+
+	return ret;
+}
+
+static inline void pdev_disable_cap_ats(struct pci_dev *pdev)
+{
+	struct iommu_dev_data *dev_data = dev_iommu_priv_get(&pdev->dev);
+
+	if (dev_data->ats_enabled) {
+		pci_disable_ats(pdev);
+		dev_data->ats_enabled = 0;
+	}
+}
+
+int amd_iommu_pdev_enable_cap_pri(struct pci_dev *pdev)
+{
+	struct iommu_dev_data *dev_data = dev_iommu_priv_get(&pdev->dev);
+	int ret = -EINVAL;
+
+	if (dev_data->pri_enabled)
+		return 0;
+
+	if (dev_data->flags & AMD_IOMMU_DEVICE_FLAG_PRI_SUP) {
+		/*
+		 * First reset the PRI state of the device.
+		 * FIXME: Hardcode number of outstanding requests for now
+		 */
+		if (!pci_reset_pri(pdev) && !pci_enable_pri(pdev, 32)) {
+			dev_data->pri_enabled = 1;
+			dev_data->pri_tlp     = pci_prg_resp_pasid_required(pdev);
+
+			ret = 0;
+		}
+	}
+
+	return ret;
+}
+
+void amd_iommu_pdev_disable_cap_pri(struct pci_dev *pdev)
+{
+	struct iommu_dev_data *dev_data = dev_iommu_priv_get(&pdev->dev);
+
+	if (dev_data->pri_enabled) {
+		pci_disable_pri(pdev);
+		dev_data->pri_enabled = 0;
+	}
+}
+
+static inline int pdev_enable_cap_pasid(struct pci_dev *pdev)
+{
+	struct iommu_dev_data *dev_data = dev_iommu_priv_get(&pdev->dev);
+	int ret = -EINVAL;
+
+	if (dev_data->pasid_enabled)
+		return 0;
+
+	if (dev_data->flags & AMD_IOMMU_DEVICE_FLAG_PASID_SUP) {
+		/* Only allow access to user-accessible pages */
+		ret = pci_enable_pasid(pdev, 0);
+		if (!ret)
+			dev_data->pasid_enabled = 1;
+	}
+
+	return ret;
+}
+
+static inline void pdev_disable_cap_pasid(struct pci_dev *pdev)
+{
+	struct iommu_dev_data *dev_data = dev_iommu_priv_get(&pdev->dev);
+
+	if (dev_data->pasid_enabled) {
+		pci_disable_pasid(pdev);
+		dev_data->pasid_enabled = 0;
+	}
+}
+
+static void pdev_enable_caps(struct pci_dev *pdev)
+{
+	pdev_enable_cap_ats(pdev);
+	pdev_enable_cap_pasid(pdev);
+	amd_iommu_pdev_enable_cap_pri(pdev);
+
+}
+
+static void pdev_disable_caps(struct pci_dev *pdev)
+{
+	pdev_disable_cap_ats(pdev);
+	pdev_disable_cap_pasid(pdev);
+	amd_iommu_pdev_disable_cap_pri(pdev);
 }
 
 /*
···
 	 * it'll be forced to go into translation mode.
 	 */
 	if ((iommu_default_passthrough() || !amd_iommu_force_isolation) &&
-	    dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) {
-		dev_data->iommu_v2 = iommu->is_iommu_v2;
+	    dev_is_pci(dev) && amd_iommu_gt_ppr_supported()) {
+		dev_data->flags = pdev_get_caps(to_pci_dev(dev));
 	}
 
 	dev_iommu_priv_set(dev, dev_data);
···
 	writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
 }
 
-static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw)
-{
-	struct amd_iommu_fault fault;
-
-	if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) {
-		pr_err_ratelimited("Unknown PPR request received\n");
-		return;
-	}
-
-	fault.address   = raw[1];
-	fault.pasid     = PPR_PASID(raw[0]);
-	fault.sbdf      = PCI_SEG_DEVID_TO_SBDF(iommu->pci_seg->id, PPR_DEVID(raw[0]));
-	fault.tag       = PPR_TAG(raw[0]);
-	fault.flags     = PPR_FLAGS(raw[0]);
-
-	atomic_notifier_call_chain(&ppr_notifier, 0, &fault);
-}
-
 static void iommu_poll_ppr_log(struct amd_iommu *iommu)
 {
 	u32 head, tail;
···
 		head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE;
 		writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
 
-		/* Handle PPR entry */
-		iommu_handle_ppr_entry(iommu, entry);
+		/* TODO: PPR Handler will be added when we add IOPF support */
 
 		/* Refresh ring-buffer information */
 		head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
···
 }
 
 static void build_complete_ppr(struct iommu_cmd *cmd, u16 devid, u32 pasid,
-			       int status, int tag, bool gn)
+			       int status, int tag, u8 gn)
 {
 	memset(cmd, 0, sizeof(*cmd));
 
···
 
 void iommu_flush_all_caches(struct amd_iommu *iommu)
 {
-	if (iommu_feature(iommu, FEATURE_IA)) {
+	if (check_feature(FEATURE_IA)) {
 		amd_iommu_flush_all(iommu);
 	} else {
 		amd_iommu_flush_dte_all(iommu);
···
 	struct iommu_cmd cmd;
 	int qdep;
 
-	qdep     = dev_data->ats.qdep;
+	qdep     = dev_data->ats_qdep;
 	iommu    = rlookup_amd_iommu(dev_data->dev);
 	if (!iommu)
 		return -EINVAL;
···
 			return ret;
 	}
 
-	if (dev_data->ats.enabled)
+	if (dev_data->ats_enabled)
 		ret = device_flush_iotlb(dev_data, 0, ~0UL);
 
 	return ret;
···
 
 	list_for_each_entry(dev_data, &domain->dev_list, list) {
 
-		if (!dev_data->ats.enabled)
+		if (!dev_data->ats_enabled)
 			continue;
 
 		ret |= device_flush_iotlb(dev_data, address, size);
···
 	free_page((unsigned long)domain->gcr3_tbl);
 }
 
+/*
+ * Number of GCR3 table levels required. Level must be 4-Kbyte
+ * page and can contain up to 512 entries.
+ */
+static int get_gcr3_levels(int pasids)
+{
+	int levels;
+
+	if (pasids == -1)
+		return amd_iommu_max_glx_val;
+
+	levels = get_count_order(pasids);
+
+	return levels ? (DIV_ROUND_UP(levels, 9) - 1) : levels;
+}
+
+/* Note: This function expects iommu_domain->lock to be held prior calling the function. */
+static int setup_gcr3_table(struct protection_domain *domain, int pasids)
+{
+	int levels = get_gcr3_levels(pasids);
+
+	if (levels > amd_iommu_max_glx_val)
+		return -EINVAL;
+
+	domain->gcr3_tbl = alloc_pgtable_page(domain->nid, GFP_ATOMIC);
+	if (domain->gcr3_tbl == NULL)
+		return -ENOMEM;
+
+	domain->glx      = levels;
+	domain->flags   |= PD_IOMMUV2_MASK;
+
+	amd_iommu_domain_update(domain);
+
+	return 0;
+}
+
 static void set_dte_entry(struct amd_iommu *iommu, u16 devid,
 			  struct protection_domain *domain, bool ats, bool ppr)
 {
···
 	if (ats)
 		flags |= DTE_FLAG_IOTLB;
 
-	if (ppr) {
-		if (iommu_feature(iommu, FEATURE_EPHSUP))
-			pte_root |= 1ULL << DEV_ENTRY_PPR;
-	}
+	if (ppr)
+		pte_root |= 1ULL << DEV_ENTRY_PPR;
 
 	if (domain->flags & PD_IOMMUV2_MASK) {
 		u64 gcr3 = iommu_virt_to_phys(domain->gcr3_tbl);
···
 	iommu = rlookup_amd_iommu(dev_data->dev);
 	if (!iommu)
 		return;
-	ats   = dev_data->ats.enabled;
+	ats   = dev_data->ats_enabled;
 
 	/* Update data structures */
 	dev_data->domain = domain;
···
 
 	/* Update device table */
 	set_dte_entry(iommu, dev_data->devid, domain,
-		      ats, dev_data->iommu_v2);
+		      ats, dev_data->ppr);
 	clone_aliases(iommu, dev_data->dev);
 
 	device_flush_dte(dev_data);
···
 	domain->dev_cnt                 -= 1;
 }
 
-static void pdev_iommuv2_disable(struct pci_dev *pdev)
-{
-	pci_disable_ats(pdev);
-	pci_disable_pri(pdev);
-	pci_disable_pasid(pdev);
-}
-
-static int pdev_pri_ats_enable(struct pci_dev *pdev)
-{
-	int ret;
-
-	/* Only allow access to user-accessible pages */
-	ret = pci_enable_pasid(pdev, 0);
-	if (ret)
-		return ret;
-
-	/* First reset the PRI state of the device */
-	ret = pci_reset_pri(pdev);
-	if (ret)
-		goto out_err_pasid;
-
-	/* Enable PRI */
-	/* FIXME: Hardcode number of outstanding requests for now */
-	ret = pci_enable_pri(pdev, 32);
-	if (ret)
-		goto out_err_pasid;
-
-	ret = pci_enable_ats(pdev, PAGE_SHIFT);
-	if (ret)
-		goto out_err_pri;
-
-	return 0;
-
-out_err_pri:
-	pci_disable_pri(pdev);
-
-out_err_pasid:
-	pci_disable_pasid(pdev);
-
-	return ret;
-}
-
 /*
  * If a device is not yet associated with a domain, this function makes the
  * device visible in the domain
···
 			 struct protection_domain *domain)
 {
 	struct iommu_dev_data *dev_data;
-	struct pci_dev *pdev;
 	unsigned long flags;
-	int ret;
+	int ret = 0;
 
 	spin_lock_irqsave(&domain->lock, flags);
 
···
 
 	spin_lock(&dev_data->lock);
 
-	ret = -EBUSY;
-	if (dev_data->domain != NULL)
+	if (dev_data->domain != NULL) {
+		ret = -EBUSY;
 		goto out;
-
-	if (!dev_is_pci(dev))
-		goto skip_ats_check;
-
-	pdev = to_pci_dev(dev);
-	if (domain->flags & PD_IOMMUV2_MASK) {
-		struct iommu_domain *def_domain = iommu_get_dma_domain(dev);
-
-		ret = -EINVAL;
-
-		/*
-		 * In case of using AMD_IOMMU_V1 page table mode and the device
-		 * is enabling for PPR/ATS support (using v2 table),
-		 * we need to make sure that the domain type is identity map.
-		 */
-		if ((amd_iommu_pgtable == AMD_IOMMU_V1) &&
-		    def_domain->type != IOMMU_DOMAIN_IDENTITY) {
-			goto out;
-		}
-
-		if (dev_data->iommu_v2) {
-			if (pdev_pri_ats_enable(pdev) != 0)
-				goto out;
-
-			dev_data->ats.enabled = true;
-			dev_data->ats.qdep    = pci_ats_queue_depth(pdev);
-			dev_data->pri_tlp     = pci_prg_resp_pasid_required(pdev);
-		}
-	} else if (amd_iommu_iotlb_sup &&
-		   pci_enable_ats(pdev, PAGE_SHIFT) == 0) {
-		dev_data->ats.enabled = true;
-		dev_data->ats.qdep    = pci_ats_queue_depth(pdev);
 	}
 
-skip_ats_check:
-	ret = 0;
+	if (dev_is_pci(dev))
+		pdev_enable_caps(to_pci_dev(dev));
 
 	do_attach(dev_data, domain);
 
···
 
 	do_detach(dev_data);
 
-	if (!dev_is_pci(dev))
-		goto out;
-
-	if (domain->flags & PD_IOMMUV2_MASK && dev_data->iommu_v2)
-		pdev_iommuv2_disable(to_pci_dev(dev));
-	else if (dev_data->ats.enabled)
-		pci_disable_ats(to_pci_dev(dev));
-
-	dev_data->ats.enabled = false;
+	if (dev_is_pci(dev))
+		pdev_disable_caps(to_pci_dev(dev));
 
 out:
 	spin_unlock(&dev_data->lock);
···
 		if (!iommu)
 			continue;
 		set_dte_entry(iommu, dev_data->devid, domain,
-			      dev_data->ats.enabled, dev_data->iommu_v2);
+			      dev_data->ats_enabled, dev_data->ppr);
 		clone_aliases(iommu, dev_data->dev);
 	}
 }
···
 static void cleanup_domain(struct protection_domain *domain)
 {
 	struct iommu_dev_data *entry;
-	unsigned long flags;
 
-	spin_lock_irqsave(&domain->lock, flags);
+	lockdep_assert_held(&domain->lock);
+
+	if (!domain->dev_cnt)
+		return;
 
 	while (!list_empty(&domain->dev_list)) {
 		entry = list_first_entry(&domain->dev_list,
···
 		BUG_ON(!entry->domain);
 		do_detach(entry);
 	}
-
-	spin_unlock_irqrestore(&domain->lock, flags);
+	WARN_ON(domain->dev_cnt != 0);
 }
 
 static void protection_domain_free(struct protection_domain *domain)
···
 
 	if (domain->iop.pgtbl_cfg.tlb)
 		free_io_pgtable_ops(&domain->iop.iop.ops);
+
+	if (domain->flags & PD_IOMMUV2_MASK)
+		free_gcr3_table(domain);
+
+	if (domain->iop.root)
+		free_page((unsigned long)domain->iop.root);
 
 	if (domain->id)
 		domain_id_free(domain->id);
···
 
 	BUG_ON(mode < PAGE_MODE_NONE || mode > PAGE_MODE_6_LEVEL);
 
-	spin_lock_init(&domain->lock);
-	domain->id = domain_id_alloc();
-	if (!domain->id)
-		return -ENOMEM;
-	INIT_LIST_HEAD(&domain->dev_list);
-
 	if (mode != PAGE_MODE_NONE) {
 		pt_root = (void *)get_zeroed_page(GFP_KERNEL);
-		if (!pt_root) {
-			domain_id_free(domain->id);
+		if (!pt_root)
 			return -ENOMEM;
-		}
 	}
 
 	amd_iommu_domain_set_pgtable(domain, pt_root, mode);
···
 
 static int protection_domain_init_v2(struct protection_domain *domain)
 {
-	spin_lock_init(&domain->lock);
-	domain->id = domain_id_alloc();
-	if (!domain->id)
-		return -ENOMEM;
-	INIT_LIST_HEAD(&domain->dev_list);
-
 	domain->flags |= PD_GIOV_MASK;
 
 	domain->domain.pgsize_bitmap = AMD_IOMMU_PGSIZES_V2;
 
-	if (domain_enable_v2(domain, 1)) {
-		domain_id_free(domain->id);
+	if (setup_gcr3_table(domain, 1))
 		return -ENOMEM;
-	}
 
 	return 0;
 }
···
 	struct io_pgtable_ops *pgtbl_ops;
 	struct protection_domain *domain;
 	int pgtable;
-	int mode = DEFAULT_PGTABLE_LEVEL;
 	int ret;
-
-	/*
-	 * Force IOMMU v1 page table when iommu=pt and
-	 * when allocating domain for pass-through devices.
-	 */
-	if (type == IOMMU_DOMAIN_IDENTITY) {
-		pgtable = AMD_IOMMU_V1;
-		mode = PAGE_MODE_NONE;
-	} else if (type == IOMMU_DOMAIN_UNMANAGED) {
-		pgtable = AMD_IOMMU_V1;
-	} else if (type == IOMMU_DOMAIN_DMA || type == IOMMU_DOMAIN_DMA_FQ) {
-		pgtable = amd_iommu_pgtable;
-	} else {
-		return NULL;
-	}
 
 	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
 	if (!domain)
 		return NULL;
 
+	domain->id = domain_id_alloc();
+	if (!domain->id)
+		goto out_err;
+
+	spin_lock_init(&domain->lock);
+	INIT_LIST_HEAD(&domain->dev_list);
+	domain->nid = NUMA_NO_NODE;
+
+	switch (type) {
+	/* No need to allocate io pgtable ops in passthrough mode */
+	case IOMMU_DOMAIN_IDENTITY:
+		return domain;
+	case IOMMU_DOMAIN_DMA:
+		pgtable = amd_iommu_pgtable;
+		break;
+	/*
+	 * Force IOMMU v1 page table when allocating
+	 * domain for pass-through devices.
+	 */
+	case IOMMU_DOMAIN_UNMANAGED:
+		pgtable = AMD_IOMMU_V1;
+		break;
+	default:
+		goto out_err;
+	}
+
 	switch (pgtable) {
 	case AMD_IOMMU_V1:
-		ret = protection_domain_init_v1(domain, mode);
+		ret = protection_domain_init_v1(domain, DEFAULT_PGTABLE_LEVEL);
 		break;
 	case AMD_IOMMU_V2:
 		ret = protection_domain_init_v2(domain);
 		break;
 	default:
 		ret = -EINVAL;
+		break;
 	}
 
 	if (ret)
 		goto out_err;
 
-	/* No need to allocate io pgtable ops in passthrough mode */
-	if (type == IOMMU_DOMAIN_IDENTITY)
-		return domain;
-
-	domain->nid = NUMA_NO_NODE;
-
 	pgtbl_ops = alloc_io_pgtable_ops(pgtable, &domain->iop.pgtbl_cfg, domain);
-	if (!pgtbl_ops) {
-		domain_id_free(domain->id);
+	if (!pgtbl_ops)
 		goto out_err;
-	}
 
 	return domain;
 out_err:
-	kfree(domain);
+	protection_domain_free(domain);
 	return NULL;
 }
 
···
 static void amd_iommu_domain_free(struct iommu_domain *dom)
 {
 	struct protection_domain *domain;
-
-	domain = to_pdomain(dom);
-
-	if (domain->dev_cnt > 0)
-		cleanup_domain(domain);
-
-	BUG_ON(domain->dev_cnt != 0);
+	unsigned long flags;
 
 	if (!dom)
 		return;
 
-	if (domain->flags & PD_IOMMUV2_MASK)
-		free_gcr3_table(domain);
+	domain = to_pdomain(dom);
+
+	spin_lock_irqsave(&domain->lock, flags);
+
+	cleanup_domain(domain);
+
+	spin_unlock_irqrestore(&domain->lock, flags);
 
 	protection_domain_free(domain);
 }
···
 	return ret;
 }
 
-static void amd_iommu_iotlb_sync_map(struct iommu_domain *dom,
-				     unsigned long iova, size_t size)
+static int amd_iommu_iotlb_sync_map(struct iommu_domain *dom,
+				    unsigned long iova, size_t size)
 {
 	struct protection_domain *domain = to_pdomain(dom);
 	struct io_pgtable_ops *ops = &domain->iop.iop.ops;
 
 	if (ops->map_pages)
 		domain_flush_np_cache(domain, iova, size);
+	return 0;
 }
 
 static int amd_iommu_map_pages(struct iommu_domain *dom, unsigned long iova,
···
 
 	return dev_data->defer_attach;
 }
-EXPORT_SYMBOL_GPL(amd_iommu_is_attach_deferred);
 
 static void amd_iommu_flush_iotlb_all(struct iommu_domain *domain)
 {
···
 	 *    and require remapping.
 	 *  - SNP is enabled, because it prohibits DTE[Mode]=0.
 	 */
-	if (dev_data->iommu_v2 &&
+	if (pdev_pasid_supported(dev_data) &&
 	    !cc_platform_has(CC_ATTR_MEM_ENCRYPT) &&
 	    !amd_iommu_snp_en) {
 		return IOMMU_DOMAIN_IDENTITY;
···
 	}
 };
 
-/*****************************************************************************
- *
- * The next functions do a basic initialization of IOMMU for pass through
- * mode
- *
- * In passthrough mode the IOMMU is initialized and enabled but not used for
- * DMA-API translation.
- *
- *****************************************************************************/
-
-/* IOMMUv2 specific functions */
-int amd_iommu_register_ppr_notifier(struct notifier_block *nb)
-{
-	return atomic_notifier_chain_register(&ppr_notifier, nb);
-}
-EXPORT_SYMBOL(amd_iommu_register_ppr_notifier);
-
-int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb)
-{
-	return atomic_notifier_chain_unregister(&ppr_notifier, nb);
-}
-EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
-
-void amd_iommu_domain_direct_map(struct iommu_domain *dom)
-{
-	struct protection_domain *domain = to_pdomain(dom);
-	unsigned long flags;
-
-	spin_lock_irqsave(&domain->lock, flags);
-
-	if (domain->iop.pgtbl_cfg.tlb)
-		free_io_pgtable_ops(&domain->iop.iop.ops);
-
-	spin_unlock_irqrestore(&domain->lock, flags);
-}
-EXPORT_SYMBOL(amd_iommu_domain_direct_map);
-
-/* Note: This function expects iommu_domain->lock to be held prior calling the function. */
-static int domain_enable_v2(struct protection_domain *domain, int pasids)
-{
-	int levels;
-
-	/* Number of GCR3 table levels required */
-	for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9)
-		levels += 1;
-
-	if (levels > amd_iommu_max_glx_val)
-		return -EINVAL;
-
-	domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC);
-	if (domain->gcr3_tbl == NULL)
-		return -ENOMEM;
-
-	domain->glx      = levels;
-	domain->flags   |= PD_IOMMUV2_MASK;
-
-	amd_iommu_domain_update(domain);
-
-	return 0;
-}
-
-int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
-{
-	struct protection_domain *pdom = to_pdomain(dom);
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&pdom->lock, flags);
-
-	/*
-	 * Save us all sanity checks whether devices already in the
-	 * domain support IOMMUv2. Just force that the domain has no
-	 * devices attached when it is switched into IOMMUv2 mode.
-	 */
-	ret = -EBUSY;
-	if (pdom->dev_cnt > 0 || pdom->flags & PD_IOMMUV2_MASK)
-		goto out;
-
-	if (!pdom->gcr3_tbl)
-		ret = domain_enable_v2(pdom, pasids);
-
-out:
-	spin_unlock_irqrestore(&pdom->lock, flags);
-	return ret;
-}
-EXPORT_SYMBOL(amd_iommu_domain_enable_v2);
-
 static int __flush_pasid(struct protection_domain *domain, u32 pasid,
 			 u64 address, bool size)
 {
···
 		   There might be non-IOMMUv2 capable devices in an IOMMUv2
 		 * domain.
 		 */
-		if (!dev_data->ats.enabled)
+		if (!dev_data->ats_enabled)
 			continue;
 
-		qdep  = dev_data->ats.qdep;
+		qdep  = dev_data->ats_qdep;
 		iommu = rlookup_amd_iommu(dev_data->dev);
 		if (!iommu)
 			continue;
···
 
 	return ret;
 }
-EXPORT_SYMBOL(amd_iommu_flush_page);
 
 static int __amd_iommu_flush_tlb(struct protection_domain *domain, u32 pasid)
 {
···
 
 	return ret;
 }
-EXPORT_SYMBOL(amd_iommu_flush_tlb);
 
 static u64 *__get_gcr3_pte(u64 *root, int level, u32 pasid, bool alloc)
 {
···
 
 	return ret;
 }
-EXPORT_SYMBOL(amd_iommu_domain_set_gcr3);
 
 int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, u32 pasid)
 {
···
 
 	return ret;
 }
-EXPORT_SYMBOL(amd_iommu_domain_clear_gcr3);
 
 int amd_iommu_complete_ppr(struct pci_dev *pdev, u32 pasid,
 			   int status, int tag)
···
 
 	return iommu_queue_command(iommu, &cmd);
 }
-EXPORT_SYMBOL(amd_iommu_complete_ppr);
-
-int amd_iommu_device_info(struct pci_dev *pdev,
-                          struct amd_iommu_device_info *info)
-{
-	int max_pasids;
-	int pos;
-
-	if (pdev == NULL || info == NULL)
-		return -EINVAL;
-
-	if (!amd_iommu_v2_supported())
-		return -EINVAL;
-
-	memset(info, 0, sizeof(*info));
-
-	if (pci_ats_supported(pdev))
-		info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP;
-
-	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
-	if (pos)
-		info->flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP;
-
-	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
-	if (pos) {
-		int features;
-
-		max_pasids = 1 << (9 * (amd_iommu_max_glx_val + 1));
-		max_pasids = min(max_pasids, (1 << 20));
-
-		info->flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
-		info->max_pasids = min(pci_max_pasids(pdev), max_pasids);
-
-		features = pci_pasid_features(pdev);
-		if (features & PCI_PASID_CAP_EXEC)
-			info->flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP;
-		if (features & PCI_PASID_CAP_PRIV)
-			info->flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP;
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(amd_iommu_device_info);
 
 #ifdef CONFIG_IRQ_REMAP
 

drivers/iommu/amd/iommu_v2.c

···
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2010-2012 Advanced Micro Devices, Inc.
- * Author: Joerg Roedel <[e-mail]>
- */
-
-#define pr_fmt(fmt)     "AMD-Vi: " fmt
-
-#include <linux/refcount.h>
-#include <linux/mmu_notifier.h>
-#include <linux/amd-iommu.h>
-#include <linux/mm_types.h>
-#include <linux/profile.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/sched/mm.h>
-#include <linux/wait.h>
-#include <linux/pci.h>
-#include <linux/gfp.h>
-#include <linux/cc_platform.h>
-
-#include "amd_iommu.h"
-
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Joerg Roedel <[e-mail]>");
-
-#define PRI_QUEUE_SIZE		512
-
-struct pri_queue {
-	atomic_t inflight;
-	bool finish;
-	int status;
-};
-
-struct pasid_state {
-	struct list_head list;			/* For global state-list */
-	refcount_t count;				/* Reference count */
-	unsigned mmu_notifier_count;		/* Counting nested mmu_notifier
-						   calls */
-	struct mm_struct *mm;			/* mm_struct for the faults */
-	struct mmu_notifier mn;                 /* mmu_notifier handle */
-	struct pri_queue pri[PRI_QUEUE_SIZE];	/* PRI tag states */
-	struct device_state *device_state;	/* Link to our device_state */
-	u32 pasid;				/* PASID index */
-	bool invalid;				/* Used during setup and
-						   teardown of the pasid */
-	spinlock_t lock;			/* Protect pri_queues and
-						   mmu_notifer_count */
-	wait_queue_head_t wq;			/* To wait for count == 0 */
-};
-
-struct device_state {
-	struct list_head list;
-	u32 sbdf;
-	atomic_t count;
-	struct pci_dev *pdev;
-	struct pasid_state **states;
-	struct iommu_domain *domain;
-	int pasid_levels;
-	int max_pasids;
-	amd_iommu_invalid_ppr_cb inv_ppr_cb;
-	amd_iommu_invalidate_ctx inv_ctx_cb;
-	spinlock_t lock;
-	wait_queue_head_t wq;
-};
-
-struct fault {
-	struct work_struct work;
-	struct device_state *dev_state;
-	struct pasid_state *state;
-	struct mm_struct *mm;
-	u64 address;
-	u32 pasid;
-	u16 tag;
-	u16 finish;
-	u16 flags;
-};
-
-static LIST_HEAD(state_list);
-static DEFINE_SPINLOCK(state_lock);
-
-static struct workqueue_struct *iommu_wq;
-
-static void free_pasid_states(struct device_state *dev_state);
-
-static struct device_state *__get_device_state(u32 sbdf)
-{
-	struct device_state *dev_state;
-
-	list_for_each_entry(dev_state, &state_list, list) {
-		if (dev_state->sbdf == sbdf)
-			return dev_state;
-	}
-
-	return NULL;
-}
-
-static struct device_state *get_device_state(u32 sbdf)
-{
-	struct device_state *dev_state;
-	unsigned long flags;
-
-	spin_lock_irqsave(&state_lock, flags);
-	dev_state = __get_device_state(sbdf);
-	if (dev_state != NULL)
-		atomic_inc(&dev_state->count);
-	spin_unlock_irqrestore(&state_lock, flags);
-
-	return dev_state;
-}
-
-static void free_device_state(struct device_state *dev_state)
-{
-	struct iommu_group *group;
-
-	/* Get rid of any remaining pasid states */
-	free_pasid_states(dev_state);
-
-	/*
-	 * Wait until the last reference is dropped before freeing
-	 * the device state.
-	 */
-	wait_event(dev_state->wq, !atomic_read(&dev_state->count));
-
-	/*
-	 * First detach device from domain - No more PRI requests will arrive
-	 * from that device after it is unbound from the IOMMUv2 domain.
-	 */
-	group = iommu_group_get(&dev_state->pdev->dev);
-	if (WARN_ON(!group))
-		return;
-
-	iommu_detach_group(dev_state->domain, group);
-
-	iommu_group_put(group);
-
-	/* Everything is down now, free the IOMMUv2 domain */
-	iommu_domain_free(dev_state->domain);
-
-	/* Finally get rid of the device-state */
-	kfree(dev_state);
-}
-
-static void put_device_state(struct device_state *dev_state)
-{
-	if (atomic_dec_and_test(&dev_state->count))
-		wake_up(&dev_state->wq);
-}
-
-/* Must be called under dev_state->lock */
-static struct pasid_state **__get_pasid_state_ptr(struct device_state *dev_state,
-						  u32 pasid, bool alloc)
-{
-	struct pasid_state **root, **ptr;
-	int level, index;
-
-	level = dev_state->pasid_levels;
-	root  = dev_state->states;
-
-	while (true) {
-
-		index = (pasid >> (9 * level)) & 0x1ff;
-		ptr   = &root[index];
-
-		if (level == 0)
-			break;
-
-		if (*ptr == NULL) {
-			if (!alloc)
-				return NULL;
-
-			*ptr = (void *)get_zeroed_page(GFP_ATOMIC);
-			if (*ptr == NULL)
-				return NULL;
-		}
-
-		root   = (struct pasid_state **)*ptr;
-		level -= 1;
-	}
-
-	return ptr;
-}
-
-static int set_pasid_state(struct device_state *dev_state,
-			   struct pasid_state *pasid_state,
-			   u32 pasid)
-{
-	struct pasid_state **ptr;
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&dev_state->lock, flags);
-	ptr = __get_pasid_state_ptr(dev_state, pasid, true);
-
-	ret = -ENOMEM;
-	if (ptr == NULL)
-		goto out_unlock;
-
-	ret = -ENOMEM;
-	if (*ptr != NULL)
-		goto out_unlock;
-
-	*ptr = pasid_state;
-
-	ret = 0;
-
-out_unlock:
-	spin_unlock_irqrestore(&dev_state->lock, flags);
-
-	return ret;
-}
-
-static void clear_pasid_state(struct device_state *dev_state, u32 pasid)
-{
-	struct pasid_state **ptr;
-	unsigned long flags;
-
-	spin_lock_irqsave(&dev_state->lock, flags);
-	ptr = __get_pasid_state_ptr(dev_state, pasid, true);
-
-	if (ptr == NULL)
-		goto out_unlock;
-
-	*ptr = NULL;
-
-out_unlock:
-	spin_unlock_irqrestore(&dev_state->lock, flags);
-}
-
-static struct pasid_state *get_pasid_state(struct device_state *dev_state,
-					   u32 pasid)
-{
-	struct pasid_state **ptr, *ret = NULL;
-	unsigned long flags;
-
-	spin_lock_irqsave(&dev_state->lock, flags);
-	ptr = __get_pasid_state_ptr(dev_state, pasid, false);
-
-	if (ptr == NULL)
-		goto out_unlock;
-
-	ret = *ptr;
-	if (ret)
-		refcount_inc(&ret->count);
-
-out_unlock:
-	spin_unlock_irqrestore(&dev_state->lock, flags);
-
-	return ret;
-}
-
-static void free_pasid_state(struct pasid_state *pasid_state)
-{
-	kfree(pasid_state);
-}
-
-static void put_pasid_state(struct pasid_state *pasid_state)
-{
-	if (refcount_dec_and_test(&pasid_state->count))
-		wake_up(&pasid_state->wq);
-}
-
-static void put_pasid_state_wait(struct pasid_state *pasid_state)
-{
-	if (!refcount_dec_and_test(&pasid_state->count))
-		wait_event(pasid_state->wq, !refcount_read(&pasid_state->count));
-	free_pasid_state(pasid_state);
-}
-
-static void unbind_pasid(struct pasid_state *pasid_state)
-{
-	struct iommu_domain *domain;
-
-	domain = pasid_state->device_state->domain;
-
-	/*
-	 * Mark pasid_state as invalid, no more faults will we added to the
-	 * work queue after this is visible everywhere.
-	 */
-	pasid_state->invalid = true;
-
-	/* Make sure this is visible */
-	smp_wmb();
-
-	/* After this the device/pasid can't access the mm anymore */
-	amd_iommu_domain_clear_gcr3(domain, pasid_state->pasid);
-
-	/* Make sure no more pending faults are in the queue */
-	flush_workqueue(iommu_wq);
-}
-
-static void free_pasid_states_level1(struct pasid_state **tbl)
-{
-	int i;
-
-	for (i = 0; i < 512; ++i) {
-		if (tbl[i] == NULL)
-			continue;
-
-		free_page((unsigned long)tbl[i]);
-	}
-}
-
-static void free_pasid_states_level2(struct pasid_state **tbl)
-{
-	struct pasid_state **ptr;
-	int i;
-
-	for (i = 0; i < 512; ++i) {
-		if (tbl[i] == NULL)
-			continue;
-
-		ptr = (struct pasid_state **)tbl[i];
-		free_pasid_states_level1(ptr);
-	}
-}
-
-static void free_pasid_states(struct device_state *dev_state)
-{
-	struct pasid_state *pasid_state;
-	int i;
-
-	for (i = 0; i < dev_state->max_pasids; ++i) {
-		pasid_state = get_pasid_state(dev_state, i);
-		if (pasid_state == NULL)
-			continue;
-
-		put_pasid_state(pasid_state);
-
-		/* Clear the pasid state so that the pasid can be re-used */
-		clear_pasid_state(dev_state, pasid_state->pasid);
-
-		/*
-		 * This will call the mn_release function and
-		 * unbind the PASID
-		 */
-		mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
-
-		put_pasid_state_wait(pasid_state); /* Reference taken in
-						      amd_iommu_bind_pasid */
-
-		/* Drop reference taken in amd_iommu_bind_pasid */
-		put_device_state(dev_state);
-	}
-
-	if (dev_state->pasid_levels == 2)
-		free_pasid_states_level2(dev_state->states);
-	else if (dev_state->pasid_levels == 1)
-		free_pasid_states_level1(dev_state->states);
-	else
-		BUG_ON(dev_state->pasid_levels != 0);
-
-	free_page((unsigned long)dev_state->states);
-}
-
-static struct pasid_state *mn_to_state(struct mmu_notifier *mn)
-{
-	return container_of(mn, struct pasid_state, mn);
-}
-
-static void mn_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
-					struct mm_struct *mm,
-					unsigned long start, unsigned long end)
-{
-	struct pasid_state *pasid_state;
-	struct device_state *dev_state;
-
-	pasid_state = mn_to_state(mn);
-	dev_state   = pasid_state->device_state;
-
-	if ((start ^ (end - 1)) < PAGE_SIZE)
-		amd_iommu_flush_page(dev_state->domain, pasid_state->pasid,
-				     start);
-	else
-		amd_iommu_flush_tlb(dev_state->domain, pasid_state->pasid);
-}
-
-static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
-{
-	struct pasid_state *pasid_state;
-	struct device_state *dev_state;
-	bool run_inv_ctx_cb;
-
-	might_sleep();
-
-	pasid_state    = mn_to_state(mn);
-	dev_state      = pasid_state->device_state;
-	run_inv_ctx_cb = !pasid_state->invalid;
-
-	if (run_inv_ctx_cb && dev_state->inv_ctx_cb)
-		dev_state->inv_ctx_cb(dev_state->pdev, pasid_state->pasid);
-
-	unbind_pasid(pasid_state);
-}
-
-static const struct mmu_notifier_ops iommu_mn = {
-	.release			= mn_release,
-	.arch_invalidate_secondary_tlbs	= mn_arch_invalidate_secondary_tlbs,
-};
-
-static void set_pri_tag_status(struct pasid_state *pasid_state,
-			       u16 tag, int status)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&pasid_state->lock, flags);
-	pasid_state->pri[tag].status = status;
-	spin_unlock_irqrestore(&pasid_state->lock, flags);
-}
-
-static void finish_pri_tag(struct device_state *dev_state,
-			   struct pasid_state *pasid_state,
-			   u16 tag)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&pasid_state->lock, flags);
-	if (atomic_dec_and_test(&pasid_state->pri[tag].inflight) &&
-	    pasid_state->pri[tag].finish) {
-		amd_iommu_complete_ppr(dev_state->pdev, pasid_state->pasid,
-				       pasid_state->pri[tag].status, tag);
-		pasid_state->pri[tag].finish = false;
-		pasid_state->pri[tag].status = PPR_SUCCESS;
-	}
-	spin_unlock_irqrestore(&pasid_state->lock, flags);
-}
-
-static void handle_fault_error(struct fault *fault)
-{
-	int status;
-
-	if (!fault->dev_state->inv_ppr_cb) {
-		set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
-		return;
-	}
-
-	status = fault->dev_state->inv_ppr_cb(fault->dev_state->pdev,
-					      fault->pasid,
-					      fault->address,
-					      fault->flags);
-	switch (status) {
-	case AMD_IOMMU_INV_PRI_RSP_SUCCESS:
-		set_pri_tag_status(fault->state, fault->tag, PPR_SUCCESS);
-		break;
-	case AMD_IOMMU_INV_PRI_RSP_INVALID:
-		set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
-		break;
-	case AMD_IOMMU_INV_PRI_RSP_FAIL:
-		set_pri_tag_status(fault->state, fault->tag, PPR_FAILURE);
-		break;
-	default:
-		BUG();
-	}
-}
-
-static bool access_error(struct vm_area_struct *vma, struct fault *fault)
-{
-	unsigned long requested = 0;
-
-	if (fault->flags & PPR_FAULT_EXEC)
-		requested |= VM_EXEC;
-
-	if (fault->flags & PPR_FAULT_READ)
-		requested |= VM_READ;
-
-	if (fault->flags & PPR_FAULT_WRITE)
-		requested |= VM_WRITE;
-
-	return (requested & ~vma->vm_flags) != 0;
-}
-
-static void do_fault(struct work_struct *work)
-{
-	struct fault *fault = container_of(work, struct fault, work);
-	struct vm_area_struct *vma;
-	vm_fault_t ret = VM_FAULT_ERROR;
-	unsigned int flags = 0;
-	struct mm_struct *mm;
-	u64 address;
-
-	mm = fault->state->mm;
-	address = fault->address;
-
-	if (fault->flags & PPR_FAULT_USER)
-		flags |= FAULT_FLAG_USER;
-	if (fault->flags & PPR_FAULT_WRITE)
-		flags |= FAULT_FLAG_WRITE;
-	flags |= FAULT_FLAG_REMOTE;
-
-	mmap_read_lock(mm);
-	vma = vma_lookup(mm, address);
-	if (!vma)
-		/* failed to get a vma in the right range */
-		goto out;
-
-	/* Check if we have the right permissions on the vma */
-	if (access_error(vma, fault))
-		goto out;
-
-	ret = handle_mm_fault(vma, address, flags, NULL);
-out:
-	mmap_read_unlock(mm);
-
-	if (ret & VM_FAULT_ERROR)
-		/* failed to service fault */
-		handle_fault_error(fault);
-
-	finish_pri_tag(fault->dev_state, fault->state, fault->tag);
-
-	put_pasid_state(fault->state);
-
-	kfree(fault);
-}
-
-static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data)
-{
-	struct amd_iommu_fault *iommu_fault;
-	struct pasid_state *pasid_state;
-	struct device_state *dev_state;
-	struct pci_dev *pdev = NULL;
-	unsigned long flags;
-	struct fault *fault;
-	bool finish;
-	u16 tag, devid, seg_id;
-	int ret;
-
-	iommu_fault = data;
-	tag         = iommu_fault->tag & 0x1ff;
-	finish      = (iommu_fault->tag >> 9) & 1;
-
-	seg_id = PCI_SBDF_TO_SEGID(iommu_fault->sbdf);
-	devid = PCI_SBDF_TO_DEVID(iommu_fault->sbdf);
-	pdev = pci_get_domain_bus_and_slot(seg_id, PCI_BUS_NUM(devid),
-					   devid & 0xff);
-	if (!pdev)
-		return -ENODEV;
-
-	ret = NOTIFY_DONE;
-
-	/* In kdump kernel pci dev is not initialized yet -> send INVALID */
-	if (amd_iommu_is_attach_deferred(&pdev->dev)) {
-		amd_iommu_complete_ppr(pdev, iommu_fault->pasid,
-				       PPR_INVALID, tag);
-		goto out;
-	}
-
-	dev_state = get_device_state(iommu_fault->sbdf);
-	if (dev_state == NULL)
-		goto out;
-
-	pasid_state = get_pasid_state(dev_state, iommu_fault->pasid);
-	if (pasid_state == NULL || pasid_state->invalid) {
-		/* We know the device but not the PASID -> send INVALID */
-		amd_iommu_complete_ppr(dev_state->pdev, iommu_fault->pasid,
-				       PPR_INVALID, tag);
-		goto out_drop_state;
-	}
-
-	spin_lock_irqsave(&pasid_state->lock, flags);
-	atomic_inc(&pasid_state->pri[tag].inflight);
-	if (finish)
-		pasid_state->pri[tag].finish = true;
-	spin_unlock_irqrestore(&pasid_state->lock, flags);
-
-	fault = kzalloc(sizeof(*fault), GFP_ATOMIC);
-	if (fault == NULL) {
-		/* We are OOM - send success and let the device re-fault */
-		finish_pri_tag(dev_state, pasid_state, tag);
-		goto out_drop_state;
-	}
-
-	fault->dev_state = dev_state;
-	fault->address   = iommu_fault->address;
-	fault->state     = pasid_state;
-	fault->tag       = tag;
-	fault->finish    = finish;
-	fault->pasid     = iommu_fault->pasid;
-	fault->flags     = iommu_fault->flags;
-	INIT_WORK(&fault->work, do_fault);
-
-	queue_work(iommu_wq, &fault->work);
-
-	ret = NOTIFY_OK;
-
-out_drop_state:
-
-	if (ret != NOTIFY_OK && pasid_state)
-		put_pasid_state(pasid_state);
-
-	put_device_state(dev_state);
-
-out:
-	pci_dev_put(pdev);
-	return ret;
-}
-
-static struct notifier_block ppr_nb = {
-	.notifier_call = ppr_notifier,
-};
-
-int amd_iommu_bind_pasid(struct pci_dev *pdev, u32 pasid,
-			 struct task_struct *task)
-{
-	struct pasid_state *pasid_state;
-	struct device_state *dev_state;
-	struct mm_struct *mm;
-	u32 sbdf;
-	int ret;
-
-	might_sleep();
-
-	if (!amd_iommu_v2_supported())
-		return -ENODEV;
-
-	sbdf      = get_pci_sbdf_id(pdev);
-	dev_state = get_device_state(sbdf);
-
-	if (dev_state == NULL)
-		return -EINVAL;
-
-	ret = -EINVAL;
-	if (pasid >= dev_state->max_pasids)
-		goto out;
-
-	ret = -ENOMEM;
-	pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL);
-	if (pasid_state == NULL)
-		goto out;
-
-
-	refcount_set(&pasid_state->count, 1);
-	init_waitqueue_head(&pasid_state->wq);
-	spin_lock_init(&pasid_state->lock);
-
-	mm                        = get_task_mm(task);
-	pasid_state->mm           = mm;
-	pasid_state->device_state = dev_state;
-	pasid_state->pasid        = pasid;
-	pasid_state->invalid      = true; /* Mark as valid only if we are
-					     done with setting up the pasid */
-	pasid_state->mn.ops       = &iommu_mn;
-
-	if (pasid_state->mm == NULL)
-		goto out_free;
-
-	ret = mmu_notifier_register(&pasid_state->mn, mm);
-	if (ret)
-		goto out_free;
-
-	ret = set_pasid_state(dev_state, pasid_state, pasid);
-	if (ret)
-		goto out_unregister;
-
-	ret = amd_iommu_domain_set_gcr3(dev_state->domain, pasid,
-					__pa(pasid_state->mm->pgd));
-	if (ret)
-		goto out_clear_state;
-
-	/* Now we are ready to handle faults */
-	pasid_state->invalid = false;
-
-	/*
-	 * Drop the reference to the mm_struct here. We rely on the
-	 * mmu_notifier release call-back to inform us when the mm
-	 * is going away.
-	 */
-	mmput(mm);
-
-	return 0;
-
-out_clear_state:
-	clear_pasid_state(dev_state, pasid);
-
-out_unregister:
-	mmu_notifier_unregister(&pasid_state->mn, mm);
-	mmput(mm);
-
-out_free:
-	free_pasid_state(pasid_state);
-
-out:
-	put_device_state(dev_state);
-
-	return ret;
-}
-EXPORT_SYMBOL(amd_iommu_bind_pasid);
-
-void amd_iommu_unbind_pasid(struct pci_dev *pdev, u32 pasid)
-{
-	struct pasid_state *pasid_state;
-	struct device_state *dev_state;
-	u32 sbdf;
-
-	might_sleep();
-
-	if (!amd_iommu_v2_supported())
-		return;
-
-	sbdf = get_pci_sbdf_id(pdev);
-	dev_state = get_device_state(sbdf);
-	if (dev_state == NULL)
-		return;
-
-	if (pasid >= dev_state->max_pasids)
-		goto out;
-
-	pasid_state = get_pasid_state(dev_state, pasid);
-	if (pasid_state == NULL)
-		goto out;
-	/*
-	 * Drop reference taken here. We are safe because we still hold
-	 * the reference taken in the amd_iommu_bind_pasid function.
-	 */
-	put_pasid_state(pasid_state);
-
-	/* Clear the pasid state so that the pasid can be re-used */
-	clear_pasid_state(dev_state, pasid_state->pasid);
-
-	/*
-	 * Call mmu_notifier_unregister to drop our reference
-	 * to pasid_state->mm
-	 */
-	mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
-
-	put_pasid_state_wait(pasid_state); /* Reference taken in
-					      amd_iommu_bind_pasid */
-out:
-	/* Drop reference taken in this function */
-	put_device_state(dev_state);
-
-	/* Drop reference taken in amd_iommu_bind_pasid */
-	put_device_state(dev_state);
-}
-EXPORT_SYMBOL(amd_iommu_unbind_pasid);
-
-int amd_iommu_init_device(struct pci_dev *pdev, int pasids)
-{
-	struct device_state *dev_state;
-	struct iommu_group *group;
-	unsigned long flags;
-	int ret, tmp;
-	u32 sbdf;
-
-	might_sleep();
-
-	/*
-	 * When memory encryption is active the device is likely not in a
-	 * direct-mapped domain. Forbid using IOMMUv2 functionality for now.
-	 */
-	if (cc_platform_has(CC_ATTR_MEM_ENCRYPT))
-		return -ENODEV;
-
-	if (!amd_iommu_v2_supported())
-		return -ENODEV;
-
-	if (pasids <= 0 || pasids > (PASID_MASK + 1))
-		return -EINVAL;
-
-	sbdf = get_pci_sbdf_id(pdev);
-
-	dev_state = kzalloc(sizeof(*dev_state), GFP_KERNEL);
-	if (dev_state == NULL)
-		return -ENOMEM;
-
-	spin_lock_init(&dev_state->lock);
-	init_waitqueue_head(&dev_state->wq);
-	dev_state->pdev  = pdev;
-	dev_state->sbdf = sbdf;
-
-	tmp = pasids;
-	for (dev_state->pasid_levels = 0; (tmp - 1) & ~0x1ff; tmp >>= 9)
-		dev_state->pasid_levels += 1;
-
-	atomic_set(&dev_state->count, 1);
-	dev_state->max_pasids = pasids;
-
-	ret = -ENOMEM;
-	dev_state->states = (void *)get_zeroed_page(GFP_KERNEL);
-	if (dev_state->states == NULL)
-		goto out_free_dev_state;
-
-	dev_state->domain = iommu_domain_alloc(&pci_bus_type);
-	if (dev_state->domain == NULL)
-		goto out_free_states;
-
-	/* See iommu_is_default_domain() */
-	dev_state->domain->type = IOMMU_DOMAIN_IDENTITY;
-	amd_iommu_domain_direct_map(dev_state->domain);
-
-	ret = amd_iommu_domain_enable_v2(dev_state->domain, pasids);
-	if (ret)
-		goto out_free_domain;
-
-	group = iommu_group_get(&pdev->dev);
-	if (!group) {
-		ret = -EINVAL;
-		goto out_free_domain;
-	}
-
-	ret = iommu_attach_group(dev_state->domain, group);
-	if (ret != 0)
-		goto out_drop_group;
-
-	iommu_group_put(group);
-
-	spin_lock_irqsave(&state_lock, flags);
-
-	if (__get_device_state(sbdf) != NULL) {
-		spin_unlock_irqrestore(&state_lock, flags);
-		ret = -EBUSY;
-		goto out_free_domain;
-	}
-
-	list_add_tail(&dev_state->list, &state_list);
-
-	spin_unlock_irqrestore(&state_lock, flags);
-
-	return 0;
-
-out_drop_group:
-	iommu_group_put(group);
-
-out_free_domain:
-	iommu_domain_free(dev_state->domain);
-
-out_free_states:
-	free_page((unsigned long)dev_state->states);
-
-out_free_dev_state:
-	kfree(dev_state);
-
-	return ret;
-}
-EXPORT_SYMBOL(amd_iommu_init_device);
-
-void amd_iommu_free_device(struct pci_dev *pdev)
-{
-	struct device_state *dev_state;
-	unsigned long flags;
-	u32 sbdf;
-
-	if (!amd_iommu_v2_supported())
-		return;
-
-	sbdf = get_pci_sbdf_id(pdev);
-
-	spin_lock_irqsave(&state_lock, flags);
-
-	dev_state = __get_device_state(sbdf);
-	if (dev_state == NULL) {
-		spin_unlock_irqrestore(&state_lock, flags);
-		return;
-	}
-
-	list_del(&dev_state->list);
-
-	spin_unlock_irqrestore(&state_lock, flags);
-
-	put_device_state(dev_state);
-	free_device_state(dev_state);
-}
-EXPORT_SYMBOL(amd_iommu_free_device);
-
-int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
-				 amd_iommu_invalid_ppr_cb cb)
-{
-	struct device_state *dev_state;
-	unsigned long flags;
-	u32 sbdf;
-	int ret;
-
-	if (!amd_iommu_v2_supported())
-		return -ENODEV;
-
-	sbdf = get_pci_sbdf_id(pdev);
-
-	spin_lock_irqsave(&state_lock, flags);
-
-	ret = -EINVAL;
-	dev_state = __get_device_state(sbdf);
-	if (dev_state == NULL)
-		goto out_unlock;
-
-	dev_state->inv_ppr_cb = cb;
-
-	ret = 0;
-
-out_unlock:
-	spin_unlock_irqrestore(&state_lock, flags);
-
-	return ret;
-}
-EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb);
-
-int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
-				    amd_iommu_invalidate_ctx cb)
-{
-	struct device_state *dev_state;
-	unsigned long flags;
-	u32 sbdf;
-	int ret;
-
-	if (!amd_iommu_v2_supported())
-		return -ENODEV;
-
-	sbdf = get_pci_sbdf_id(pdev);
-
-	spin_lock_irqsave(&state_lock, flags);
-
-	ret = -EINVAL;
-	dev_state = __get_device_state(sbdf);
-	if (dev_state == NULL)
-		goto out_unlock;
-
-	dev_state->inv_ctx_cb = cb;
-
-	ret = 0;
-
-out_unlock:
-	spin_unlock_irqrestore(&state_lock, flags);
-
-	return ret;
-}
-EXPORT_SYMBOL(amd_iommu_set_invalidate_ctx_cb);
-
-static int __init amd_iommu_v2_init(void)
-{
-	int ret;
-
-	if (!amd_iommu_v2_supported()) {
-		pr_info("AMD IOMMUv2 functionality not available on this system - This is not a bug.\n");
-		/*
-		 * Load anyway to provide the symbols to other modules
-		 * which may use AMD IOMMUv2 optionally.
-		 */
-		return 0;
-	}
-
-	ret = -ENOMEM;
-	iommu_wq = alloc_workqueue("amd_iommu_v2", WQ_MEM_RECLAIM, 0);
-	if (iommu_wq == NULL)
-		goto out;
-
-	amd_iommu_register_ppr_notifier(&ppr_nb);
-
-	pr_info("AMD IOMMUv2 loaded and initialized\n");
-
-	return 0;
-
-out:
-	return ret;
-}
-
-static void __exit amd_iommu_v2_exit(void)
-{
-	struct device_state *dev_state, *next;
-	unsigned long flags;
-	LIST_HEAD(freelist);
-
-	if (!amd_iommu_v2_supported())
-		return;
-
-	amd_iommu_unregister_ppr_notifier(&ppr_nb);
-
-	flush_workqueue(iommu_wq);
-
-	/*
-	 * The loop below might call flush_workqueue(), so call
-	 * destroy_workqueue() after it
-	 */
-	spin_lock_irqsave(&state_lock, flags);
-
-	list_for_each_entry_safe(dev_state, next, &state_list, list) {
-		WARN_ON_ONCE(1);
-
-		put_device_state(dev_state);
-		list_del(&dev_state->list);
-		list_add_tail(&dev_state->list, &freelist);
-	}
-
-	spin_unlock_irqrestore(&state_lock, flags);
-
-	/*
-	 * Since free_device_state waits on the count to be zero,
-	 * we need to free dev_state outside the spinlock.
-	 */
-	list_for_each_entry_safe(dev_state, next, &freelist, list) {
-		list_del(&dev_state->list);
-		free_device_state(dev_state);
-	}
-
-	destroy_workqueue(iommu_wq);
-}
-
-module_init(amd_iommu_v2_init);
-module_exit(amd_iommu_v2_exit);

drivers/iommu/apple-dart.c

···
  * @lock: lock for hardware operations involving this dart
  * @pgsize: pagesize supported by this DART
  * @supports_bypass: indicates if this DART supports bypass mode
- * @force_bypass: force bypass mode due to pagesize mismatch?
  * @sid2group: maps stream ids to iommu_groups
  * @iommu: iommu core device
  */
···
 	u32 pgsize;
 	u32 num_streams;
 	u32 supports_bypass : 1;
-	u32 force_bypass : 1;
 
 	struct iommu_group *sid2group[DART_MAX_STREAMS];
 	struct iommu_device iommu;
···
 	apple_dart_domain_flush_tlb(to_dart_domain(domain));
 }
 
-static void apple_dart_iotlb_sync_map(struct iommu_domain *domain,
-				      unsigned long iova, size_t size)
+static int apple_dart_iotlb_sync_map(struct iommu_domain *domain,
+				     unsigned long iova, size_t size)
 {
 	apple_dart_domain_flush_tlb(to_dart_domain(domain));
+	return 0;
 }
 
 static phys_addr_t apple_dart_iova_to_phys(struct iommu_domain *domain,
···
 	stream_map->dart->hw->invalidate_tlb(stream_map);
 }
 
-static int apple_dart_finalize_domain(struct iommu_domain *domain,
+static int apple_dart_finalize_domain(struct apple_dart_domain *dart_domain,
 				      struct apple_dart_master_cfg *cfg)
 {
-	struct apple_dart_domain *dart_domain = to_dart_domain(domain);
 	struct apple_dart *dart = cfg->stream_maps[0].dart;
 	struct io_pgtable_cfg pgtbl_cfg;
 	int ret = 0;
 	int i, j;
+
+	if (dart->pgsize > PAGE_SIZE)
+		return -EINVAL;
 
 	mutex_lock(&dart_domain->init_lock);
 
···
 		.iommu_dev = dart->dev,
 	};
 
-	dart_domain->pgtbl_ops =
-		alloc_io_pgtable_ops(dart->hw->fmt, &pgtbl_cfg, domain);
+	dart_domain->pgtbl_ops = alloc_io_pgtable_ops(dart->hw->fmt, &pgtbl_cfg,
+						      &dart_domain->domain);
 	if (!dart_domain->pgtbl_ops) {
 		ret = -ENOMEM;
 		goto done;
 	}
 
-	domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
-	domain->geometry.aperture_start = 0;
-	domain->geometry.aperture_end = (dma_addr_t)DMA_BIT_MASK(dart->ias);
-	domain->geometry.force_aperture = true;
+	dart_domain->domain.pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
+	dart_domain->domain.geometry.aperture_start = 0;
+	dart_domain->domain.geometry.aperture_end =
+		(dma_addr_t)DMA_BIT_MASK(dart->ias);
+	dart_domain->domain.geometry.force_aperture = true;
 
 	dart_domain->finalized = true;
 
···
 				      true);
 }
 
-static int apple_dart_attach_dev(struct iommu_domain *domain,
-				 struct device *dev)
+static int apple_dart_attach_dev_paging(struct iommu_domain *domain,
+					struct device *dev)
 {
 	int ret, i;
 	struct apple_dart_stream_map *stream_map;
 	struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 	struct apple_dart_domain *dart_domain = to_dart_domain(domain);
 
-	if (cfg->stream_maps[0].dart->force_bypass &&
-	    domain->type != IOMMU_DOMAIN_IDENTITY)
-		return -EINVAL;
-	if (!cfg->stream_maps[0].dart->supports_bypass &&
-	    domain->type == IOMMU_DOMAIN_IDENTITY)
-		return -EINVAL;
-
-	ret = apple_dart_finalize_domain(domain, cfg);
+	ret = apple_dart_finalize_domain(dart_domain, cfg);
 	if (ret)
 		return ret;
 
-	switch (domain->type) {
-	default:
-		ret = apple_dart_domain_add_streams(dart_domain, cfg);
-		if (ret)
-			return ret;
+	ret = apple_dart_domain_add_streams(dart_domain, cfg);
+	if (ret)
+		return ret;
 
-		for_each_stream_map(i, cfg, stream_map)
-			apple_dart_setup_translation(dart_domain, stream_map);
-		break;
-	case IOMMU_DOMAIN_BLOCKED:
-		for_each_stream_map(i, cfg, stream_map)
-			apple_dart_hw_disable_dma(stream_map);
-		break;
-	case IOMMU_DOMAIN_IDENTITY:
-		for_each_stream_map(i, cfg, stream_map)
-			apple_dart_hw_enable_bypass(stream_map);
-		break;
-	}
-
-	return ret;
+	for_each_stream_map(i, cfg, stream_map)
+		apple_dart_setup_translation(dart_domain, stream_map);
+	return 0;
 }
+
+static int apple_dart_attach_dev_identity(struct iommu_domain *domain,
+					  struct device *dev)
+{
+	struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
+	struct apple_dart_stream_map *stream_map;
+	int i;
+
+	if (!cfg->stream_maps[0].dart->supports_bypass)
+		return -EINVAL;
+
+	for_each_stream_map(i, cfg, stream_map)
+		apple_dart_hw_enable_bypass(stream_map);
+	return 0;
+}
+
+static const struct iommu_domain_ops apple_dart_identity_ops = {
+	.attach_dev = apple_dart_attach_dev_identity,
+};
+
+static struct iommu_domain apple_dart_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &apple_dart_identity_ops,
+};
+
+static int apple_dart_attach_dev_blocked(struct iommu_domain *domain,
+					 struct device *dev)
+{
+	struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
+	struct apple_dart_stream_map *stream_map;
+	int i;
+
+	for_each_stream_map(i, cfg, stream_map)
+		apple_dart_hw_disable_dma(stream_map);
+	return 0;
+}
+
+static const struct iommu_domain_ops apple_dart_blocked_ops = {
+	.attach_dev = apple_dart_attach_dev_blocked,
+};
+
+static struct iommu_domain apple_dart_blocked_domain = {
+	.type = IOMMU_DOMAIN_BLOCKED,
+	.ops = &apple_dart_blocked_ops,
+};
 
 static struct iommu_device *apple_dart_probe_device(struct device *dev)
 {
···
 	kfree(cfg);
 }
 
-static struct iommu_domain *apple_dart_domain_alloc(unsigned int type)
+static struct iommu_domain *apple_dart_domain_alloc_paging(struct device *dev)
 {
 	struct apple_dart_domain *dart_domain;
-
-	if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED &&
-	    type != IOMMU_DOMAIN_IDENTITY && type != IOMMU_DOMAIN_BLOCKED)
-		return NULL;
 
 	dart_domain = kzalloc(sizeof(*dart_domain), GFP_KERNEL);
 	if (!dart_domain)
···
 
 	mutex_init(&dart_domain->init_lock);
 
-	/* no need to allocate pgtbl_ops or do any other finalization steps */
-	if (type == IOMMU_DOMAIN_IDENTITY || type == IOMMU_DOMAIN_BLOCKED)
-		dart_domain->finalized = true;
+	if (dev) {
+		struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
+		int ret;
 
+		ret = apple_dart_finalize_domain(dart_domain, cfg);
+		if (ret) {
+			kfree(dart_domain);
+			return ERR_PTR(ret);
+		}
+	}
 	return &dart_domain->domain;
 }
 
···
 	cfg_dart = cfg->stream_maps[0].dart;
 	if (cfg_dart) {
 		if (cfg_dart->supports_bypass != dart->supports_bypass)
-			return -EINVAL;
-		if (cfg_dart->force_bypass != dart->force_bypass)
 			return -EINVAL;
 		if (cfg_dart->pgsize != dart->pgsize)
 			return -EINVAL;
···
 {
 	struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 
-	if (cfg->stream_maps[0].dart->force_bypass)
+	if (cfg->stream_maps[0].dart->pgsize > PAGE_SIZE)
 		return IOMMU_DOMAIN_IDENTITY;
 	if (!cfg->stream_maps[0].dart->supports_bypass)
 		return IOMMU_DOMAIN_DMA;
···
 }
 
 static const struct iommu_ops apple_dart_iommu_ops = {
-	.domain_alloc = apple_dart_domain_alloc,
+	.identity_domain = &apple_dart_identity_domain,
+	.blocked_domain = &apple_dart_blocked_domain,
+	.domain_alloc_paging = apple_dart_domain_alloc_paging,
 	.probe_device = apple_dart_probe_device,
 	.release_device = apple_dart_release_device,
 	.device_group = apple_dart_device_group,
···
 	.pgsize_bitmap = -1UL, /* Restricted during dart probe */
 	.owner = THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
-		.attach_dev	= apple_dart_attach_dev,
+		.attach_dev	= apple_dart_attach_dev_paging,
 		.map_pages	= apple_dart_map_pages,
 		.unmap_pages	= apple_dart_unmap_pages,
 		.flush_iotlb_all = apple_dart_flush_iotlb_all,
···
 		goto err_clk_disable;
 	}
 
-	dart->force_bypass = dart->pgsize > PAGE_SIZE;
-
 	ret = apple_dart_hw_reset(dart);
 	if (ret)
 		goto err_clk_disable;
···
 	dev_info(
 		&pdev->dev,
 		"DART [pagesize %x, %d streams, bypass support: %d, bypass forced: %d] initialized\n",
-		dart->pgsize, dart->num_streams, dart->supports_bypass, dart->force_bypass);
+		dart->pgsize, dart->num_streams, dart->supports_bypass,
+		dart->pgsize > PAGE_SIZE);
 	return 0;
 
 err_sysfs_remove:

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c

···
 #define mn_to_smmu(mn) container_of(mn, struct arm_smmu_mmu_notifier, mn)
 
 struct arm_smmu_bond {
-	struct iommu_sva		sva;
 	struct mm_struct		*mm;
 	struct arm_smmu_mmu_notifier	*smmu_mn;
 	struct list_head		list;
-	refcount_t			refs;
 };
 
 #define sva_to_bond(handle) \
 	container_of(handle, struct arm_smmu_bond, sva)
 
 static DEFINE_MUTEX(sva_lock);
+
+/*
+ * Write the CD to the CD tables for all masters that this domain is attached
+ * to. Note that this is only used to update existing CD entries in the target
+ * CD table, for which it's assumed that arm_smmu_write_ctx_desc can't fail.
+ */
+static void arm_smmu_update_ctx_desc_devices(struct arm_smmu_domain *smmu_domain,
+					   int ssid,
+					   struct arm_smmu_ctx_desc *cd)
+{
+	struct arm_smmu_master *master;
+	unsigned long flags;
+
+	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+	list_for_each_entry(master, &smmu_domain->devices, domain_head) {
+		arm_smmu_write_ctx_desc(master, ssid, cd);
+	}
+	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+}
 
 /*
  * Check if the CPU ASID is available on the SMMU side. If a private context
···
 		return cd;
 	}
 
-	smmu_domain = container_of(cd, struct arm_smmu_domain, s1_cfg.cd);
+	smmu_domain = container_of(cd, struct arm_smmu_domain, cd);
 	smmu = smmu_domain->smmu;
 
 	ret = xa_alloc(&arm_smmu_asid_xa, &new_asid, cd,
···
 	 * be some overlap between use of both ASIDs, until we invalidate the
 	 * TLB.
 	 */
-	arm_smmu_write_ctx_desc(smmu_domain, IOMMU_NO_PASID, cd);
+	arm_smmu_update_ctx_desc_devices(smmu_domain, IOMMU_NO_PASID, cd);
 
 	/* Invalidate TLB entries previously associated with that context */
 	arm_smmu_tlb_inv_asid(smmu, asid);
···
 	 * DMA may still be running. Keep the cd valid to avoid C_BAD_CD events,
 	 * but disable translation.
 	 */
-	arm_smmu_write_ctx_desc(smmu_domain, mm->pasid, &quiet_cd);
+	arm_smmu_update_ctx_desc_devices(smmu_domain, mm->pasid, &quiet_cd);
 
 	arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_mn->cd->asid);
 	arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, 0, 0);
···
 			  struct mm_struct *mm)
 {
 	int ret;
+	unsigned long flags;
 	struct arm_smmu_ctx_desc *cd;
 	struct arm_smmu_mmu_notifier *smmu_mn;
+	struct arm_smmu_master *master;
 
 	list_for_each_entry(smmu_mn, &smmu_domain->mmu_notifiers, list) {
 		if (smmu_mn->mn.mm == mm) {
···
 		goto err_free_cd;
 	}
 
-	ret = arm_smmu_write_ctx_desc(smmu_domain, mm->pasid, cd);
+	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+	list_for_each_entry(master, &smmu_domain->devices, domain_head) {
+		ret = arm_smmu_write_ctx_desc(master, mm->pasid, cd);
+		if (ret) {
+			list_for_each_entry_from_reverse(master, &smmu_domain->devices, domain_head)
+				arm_smmu_write_ctx_desc(master, mm->pasid, NULL);
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 	if (ret)
 		goto err_put_notifier;
 
···
 		return;
 
 	list_del(&smmu_mn->list);
-	arm_smmu_write_ctx_desc(smmu_domain, mm->pasid, NULL);
+
+	arm_smmu_update_ctx_desc_devices(smmu_domain, mm->pasid, NULL);
 
 	/*
 	 * If we went through clear(), we've already invalidated, and no
···
 	arm_smmu_free_shared_cd(cd);
 }
 
-static struct iommu_sva *
-__arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
+static int __arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
 {
 	int ret;
 	struct arm_smmu_bond *bond;
···
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 
 	if (!master || !master->sva_enabled)
-		return ERR_PTR(-ENODEV);
-
-	/* If bind() was already called for this {dev, mm} pair, reuse it. */
-	list_for_each_entry(bond, &master->bonds, list) {
-		if (bond->mm == mm) {
-			refcount_inc(&bond->refs);
-			return &bond->sva;
-		}
-	}
+		return -ENODEV;
 
 	bond = kzalloc(sizeof(*bond), GFP_KERNEL);
 	if (!bond)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 
 	bond->mm = mm;
-	bond->sva.dev = dev;
-	refcount_set(&bond->refs, 1);
 
 	bond->smmu_mn = arm_smmu_mmu_notifier_get(smmu_domain, mm);
 	if (IS_ERR(bond->smmu_mn)) {
···
 	}
 
 	list_add(&bond->list, &master->bonds);
-	return &bond->sva;
+	return 0;
 
 err_free_bond:
 	kfree(bond);
-	return ERR_PTR(ret);
+	return ret;
 }
 
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
···
 		}
 	}
 
-	if (!WARN_ON(!bond) && refcount_dec_and_test(&bond->refs)) {
+	if (!WARN_ON(!bond)) {
 		list_del(&bond->list);
 		arm_smmu_mmu_notifier_put(bond->smmu_mn);
 		kfree(bond);
···
 				      struct device *dev, ioasid_t id)
 {
 	int ret = 0;
-	struct iommu_sva *handle;
 	struct mm_struct *mm = domain->mm;
 
 	mutex_lock(&sva_lock);
-	handle = __arm_smmu_sva_bind(dev, mm);
-	if (IS_ERR(handle))
-		ret = PTR_ERR(handle);
+	ret = __arm_smmu_sva_bind(dev, mm);
 	mutex_unlock(&sva_lock);
 
 	return ret;

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

···
 	arm_smmu_cmdq_issue_cmd_with_sync(smmu, &cmd);
 }
 
-static void arm_smmu_sync_cd(struct arm_smmu_domain *smmu_domain,
+static void arm_smmu_sync_cd(struct arm_smmu_master *master,
 			     int ssid, bool leaf)
 {
 	size_t i;
-	unsigned long flags;
-	struct arm_smmu_master *master;
 	struct arm_smmu_cmdq_batch cmds;
-	struct arm_smmu_device *smmu = smmu_domain->smmu;
+	struct arm_smmu_device *smmu = master->smmu;
 	struct arm_smmu_cmdq_ent cmd = {
 		.opcode	= CMDQ_OP_CFGI_CD,
 		.cfgi	= {
···
 	};
 
 	cmds.num = 0;
-
-	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	list_for_each_entry(master, &smmu_domain->devices, domain_head) {
-		for (i = 0; i < master->num_streams; i++) {
-			cmd.cfgi.sid = master->streams[i].id;
-			arm_smmu_cmdq_batch_add(smmu, &cmds, &cmd);
-		}
+	for (i = 0; i < master->num_streams; i++) {
+		cmd.cfgi.sid = master->streams[i].id;
+		arm_smmu_cmdq_batch_add(smmu, &cmds, &cmd);
 	}
-	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 
 	arm_smmu_cmdq_batch_submit(smmu, &cmds);
 }
···
 	WRITE_ONCE(*dst, cpu_to_le64(val));
 }
 
-static __le64 *arm_smmu_get_cd_ptr(struct arm_smmu_domain *smmu_domain,
-				   u32 ssid)
+static __le64 *arm_smmu_get_cd_ptr(struct arm_smmu_master *master, u32 ssid)
 {
 	__le64 *l1ptr;
 	unsigned int idx;
 	struct arm_smmu_l1_ctx_desc *l1_desc;
-	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	struct arm_smmu_ctx_desc_cfg *cdcfg = &smmu_domain->s1_cfg.cdcfg;
+	struct arm_smmu_device *smmu = master->smmu;
+	struct arm_smmu_ctx_desc_cfg *cd_table = &master->cd_table;
 
-	if (smmu_domain->s1_cfg.s1fmt == STRTAB_STE_0_S1FMT_LINEAR)
-		return cdcfg->cdtab + ssid * CTXDESC_CD_DWORDS;
+	if (cd_table->s1fmt == STRTAB_STE_0_S1FMT_LINEAR)
+		return cd_table->cdtab + ssid * CTXDESC_CD_DWORDS;
 
 	idx = ssid >> CTXDESC_SPLIT;
-	l1_desc = &cdcfg->l1_desc[idx];
+	l1_desc = &cd_table->l1_desc[idx];
 	if (!l1_desc->l2ptr) {
 		if (arm_smmu_alloc_cd_leaf_table(smmu, l1_desc))
 			return NULL;
 
-		l1ptr = cdcfg->cdtab + idx * CTXDESC_L1_DESC_DWORDS;
+		l1ptr = cd_table->cdtab + idx * CTXDESC_L1_DESC_DWORDS;
 		arm_smmu_write_cd_l1_desc(l1ptr, l1_desc);
 		/* An invalid L1CD can be cached */
-		arm_smmu_sync_cd(smmu_domain, ssid, false);
+		arm_smmu_sync_cd(master, ssid, false);
 	}
 	idx = ssid & (CTXDESC_L2_ENTRIES - 1);
 	return l1_desc->l2ptr + idx * CTXDESC_CD_DWORDS;
 }
 
-int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, int ssid,
+int arm_smmu_write_ctx_desc(struct arm_smmu_master *master, int ssid,
 			    struct arm_smmu_ctx_desc *cd)
 {
 	/*
···
 	u64 val;
 	bool cd_live;
 	__le64 *cdptr;
+	struct arm_smmu_ctx_desc_cfg *cd_table = &master->cd_table;
 
-	if (WARN_ON(ssid >= (1 << smmu_domain->s1_cfg.s1cdmax)))
+	if (WARN_ON(ssid >= (1 << cd_table->s1cdmax)))
 		return -E2BIG;
 
-	cdptr = arm_smmu_get_cd_ptr(smmu_domain, ssid);
+	cdptr = arm_smmu_get_cd_ptr(master, ssid);
 	if (!cdptr)
 		return -ENOMEM;
 
···
 		cdptr[3] = cpu_to_le64(cd->mair);
 
 		/*
-		 * STE is live, and the SMMU might read dwords of this CD in any
+		 * STE may be live, and the SMMU might read dwords of this CD in any
 		 * order. Ensure that it observes valid values before reading
 		 * V=1.
 		 */
-		arm_smmu_sync_cd(smmu_domain, ssid, true);
+		arm_smmu_sync_cd(master, ssid, true);
 
 		val = cd->tcr |
 #ifdef __BIG_ENDIAN
···
 			FIELD_PREP(CTXDESC_CD_0_ASID, cd->asid) |
 			CTXDESC_CD_0_V;
 
-		if (smmu_domain->stall_enabled)
+		if (cd_table->stall_enabled)
 			val |= CTXDESC_CD_0_S;
 	}
 
···
 	 *   without first making the structure invalid.
 	 */
 	WRITE_ONCE(cdptr[0], cpu_to_le64(val));
-	arm_smmu_sync_cd(smmu_domain, ssid, true);
+	arm_smmu_sync_cd(master, ssid, true);
 	return 0;
 }
 
-static int arm_smmu_alloc_cd_tables(struct arm_smmu_domain *smmu_domain)
+static int arm_smmu_alloc_cd_tables(struct arm_smmu_master *master)
 {
 	int ret;
 	size_t l1size;
 	size_t max_contexts;
-	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
-	struct arm_smmu_ctx_desc_cfg *cdcfg = &cfg->cdcfg;
+	struct arm_smmu_device *smmu = master->smmu;
+	struct arm_smmu_ctx_desc_cfg *cd_table = &master->cd_table;
 
-	max_contexts = 1 << cfg->s1cdmax;
+	cd_table->stall_enabled = master->stall_enabled;
+	cd_table->s1cdmax = master->ssid_bits;
+	max_contexts = 1 << cd_table->s1cdmax;
 
 	if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB) ||
 	    max_contexts <= CTXDESC_L2_ENTRIES) {
-		cfg->s1fmt = STRTAB_STE_0_S1FMT_LINEAR;
-		cdcfg->num_l1_ents = max_contexts;
+		cd_table->s1fmt = STRTAB_STE_0_S1FMT_LINEAR;
+		cd_table->num_l1_ents = max_contexts;
 
 		l1size = max_contexts * (CTXDESC_CD_DWORDS << 3);
 	} else {
-		cfg->s1fmt = STRTAB_STE_0_S1FMT_64K_L2;
-		cdcfg->num_l1_ents = DIV_ROUND_UP(max_contexts,
+		cd_table->s1fmt = STRTAB_STE_0_S1FMT_64K_L2;
+		cd_table->num_l1_ents = DIV_ROUND_UP(max_contexts,
 						  CTXDESC_L2_ENTRIES);
 
-		cdcfg->l1_desc = devm_kcalloc(smmu->dev, cdcfg->num_l1_ents,
-					      sizeof(*cdcfg->l1_desc),
+		cd_table->l1_desc = devm_kcalloc(smmu->dev, cd_table->num_l1_ents,
+					      sizeof(*cd_table->l1_desc),
 					      GFP_KERNEL);
-		if (!cdcfg->l1_desc)
+		if (!cd_table->l1_desc)
 			return -ENOMEM;
 
-		l1size = cdcfg->num_l1_ents * (CTXDESC_L1_DESC_DWORDS << 3);
+		l1size = cd_table->num_l1_ents * (CTXDESC_L1_DESC_DWORDS << 3);
 	}
 
-	cdcfg->cdtab = dmam_alloc_coherent(smmu->dev, l1size, &cdcfg->cdtab_dma,
+	cd_table->cdtab = dmam_alloc_coherent(smmu->dev, l1size, &cd_table->cdtab_dma,
 					   GFP_KERNEL);
-	if (!cdcfg->cdtab) {
+	if (!cd_table->cdtab) {
 		dev_warn(smmu->dev, "failed to allocate context descriptor\n");
 		ret = -ENOMEM;
 		goto err_free_l1;
···
 	return 0;
 
 err_free_l1:
-	if (cdcfg->l1_desc) {
-		devm_kfree(smmu->dev, cdcfg->l1_desc);
-		cdcfg->l1_desc = NULL;
+	if (cd_table->l1_desc) {
+		devm_kfree(smmu->dev, cd_table->l1_desc);
+		cd_table->l1_desc = NULL;
 	}
 	return ret;
 }
 
-static void arm_smmu_free_cd_tables(struct arm_smmu_domain *smmu_domain)
+static void arm_smmu_free_cd_tables(struct arm_smmu_master *master)
 {
 	int i;
 	size_t size, l1size;
-	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	struct arm_smmu_ctx_desc_cfg *cdcfg = &smmu_domain->s1_cfg.cdcfg;
+	struct arm_smmu_device *smmu = master->smmu;
+	struct arm_smmu_ctx_desc_cfg *cd_table = &master->cd_table;
 
-	if (cdcfg->l1_desc) {
+	if (cd_table->l1_desc) {
 		size = CTXDESC_L2_ENTRIES * (CTXDESC_CD_DWORDS << 3);
 
-		for (i = 0; i < cdcfg->num_l1_ents; i++) {
-			if (!cdcfg->l1_desc[i].l2ptr)
+		for (i = 0; i < cd_table->num_l1_ents; i++) {
+			if (!cd_table->l1_desc[i].l2ptr)
 				continue;
 
 			dmam_free_coherent(smmu->dev, size,
-					   cdcfg->l1_desc[i].l2ptr,
-					   cdcfg->l1_desc[i].l2ptr_dma);
+					   cd_table->l1_desc[i].l2ptr,
+					   cd_table->l1_desc[i].l2ptr_dma);
 		}
-		devm_kfree(smmu->dev, cdcfg->l1_desc);
-		cdcfg->l1_desc = NULL;
+		devm_kfree(smmu->dev, cd_table->l1_desc);
+		cd_table->l1_desc = NULL;
 
-		l1size = cdcfg->num_l1_ents * (CTXDESC_L1_DESC_DWORDS << 3);
+		l1size = cd_table->num_l1_ents * (CTXDESC_L1_DESC_DWORDS << 3);
 	} else {
-		l1size = cdcfg->num_l1_ents * (CTXDESC_CD_DWORDS << 3);
+		l1size = cd_table->num_l1_ents * (CTXDESC_CD_DWORDS << 3);
 	}
 
-	dmam_free_coherent(smmu->dev, l1size, cdcfg->cdtab, cdcfg->cdtab_dma);
-	cdcfg->cdtab_dma = 0;
-	cdcfg->cdtab = NULL;
+	dmam_free_coherent(smmu->dev, l1size, cd_table->cdtab, cd_table->cdtab_dma);
+	cd_table->cdtab_dma = 0;
+	cd_table->cdtab = NULL;
 }
 
 bool arm_smmu_free_asid(struct arm_smmu_ctx_desc *cd)
···
 	u64 val = le64_to_cpu(dst[0]);
 	bool ste_live = false;
 	struct arm_smmu_device *smmu = NULL;
-	struct arm_smmu_s1_cfg *s1_cfg = NULL;
+	struct arm_smmu_ctx_desc_cfg *cd_table = NULL;
 	struct arm_smmu_s2_cfg *s2_cfg = NULL;
 	struct arm_smmu_domain *smmu_domain = NULL;
 	struct arm_smmu_cmdq_ent prefetch_cmd = {
···
 	if (smmu_domain) {
 		switch (smmu_domain->stage) {
 		case ARM_SMMU_DOMAIN_S1:
-			s1_cfg = &smmu_domain->s1_cfg;
+			cd_table = &master->cd_table;
 			break;
 		case ARM_SMMU_DOMAIN_S2:
 		case ARM_SMMU_DOMAIN_NESTED:
···
 	val = STRTAB_STE_0_V;
 
 	/* Bypass/fault */
-	if (!smmu_domain || !(s1_cfg || s2_cfg)) {
+	if (!smmu_domain || !(cd_table || s2_cfg)) {
 		if (!smmu_domain && disable_bypass)
 			val |= FIELD_PREP(STRTAB_STE_0_CFG, STRTAB_STE_0_CFG_ABORT);
 		else
···
 		return;
 	}
 
-	if (s1_cfg) {
+	if (cd_table) {
 		u64 strw = smmu->features & ARM_SMMU_FEAT_E2H ?
 			STRTAB_STE_1_STRW_EL2 : STRTAB_STE_1_STRW_NSEL1;
 
···
 		    !master->stall_enabled)
 			dst[1] |= cpu_to_le64(STRTAB_STE_1_S1STALLD);
 
-		val |= (s1_cfg->cdcfg.cdtab_dma & STRTAB_STE_0_S1CTXPTR_MASK) |
+		val |= (cd_table->cdtab_dma & STRTAB_STE_0_S1CTXPTR_MASK) |
 			FIELD_PREP(STRTAB_STE_0_CFG, STRTAB_STE_0_CFG_S1_TRANS) |
-			FIELD_PREP(STRTAB_STE_0_S1CDMAX, s1_cfg->s1cdmax) |
-			FIELD_PREP(STRTAB_STE_0_S1FMT, s1_cfg->s1fmt);
+			FIELD_PREP(STRTAB_STE_0_S1CDMAX, cd_table->s1cdmax) |
+			FIELD_PREP(STRTAB_STE_0_S1FMT, cd_table->s1fmt);
 	}
 
 	if (s2_cfg) {
···
 	 * careful, 007.
 	 */
 	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
-		arm_smmu_tlb_inv_asid(smmu, smmu_domain->s1_cfg.cd.asid);
+		arm_smmu_tlb_inv_asid(smmu, smmu_domain->cd.asid);
 	} else {
 		cmd.opcode	= CMDQ_OP_TLBI_S12_VMALL;
 		cmd.tlbi.vmid	= smmu_domain->s2_cfg.vmid;
···
 	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
 		cmd.opcode	= smmu_domain->smmu->features & ARM_SMMU_FEAT_E2H ?
 				  CMDQ_OP_TLBI_EL2_VA : CMDQ_OP_TLBI_NH_VA;
-		cmd.tlbi.asid	= smmu_domain->s1_cfg.cd.asid;
+		cmd.tlbi.asid	= smmu_domain->cd.asid;
 	} else {
 		cmd.opcode	= CMDQ_OP_TLBI_S2_IPA;
 		cmd.tlbi.vmid	= smmu_domain->s2_cfg.vmid;
···
 
 	free_io_pgtable_ops(smmu_domain->pgtbl_ops);
 
-	/* Free the CD and ASID, if we allocated them */
+	/* Free the ASID or VMID */
 	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
-		struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
-
 		/* Prevent SVA from touching the CD while we're freeing it */
 		mutex_lock(&arm_smmu_asid_lock);
-		if (cfg->cdcfg.cdtab)
-			arm_smmu_free_cd_tables(smmu_domain);
-		arm_smmu_free_asid(&cfg->cd);
+		arm_smmu_free_asid(&smmu_domain->cd);
 		mutex_unlock(&arm_smmu_asid_lock);
 	} else {
 		struct arm_smmu_s2_cfg *cfg = &smmu_domain->s2_cfg;
···
 }
 
 static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
-				       struct arm_smmu_master *master,
 				       struct io_pgtable_cfg *pgtbl_cfg)
 {
 	int ret;
 	u32 asid;
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
+	struct arm_smmu_ctx_desc *cd = &smmu_domain->cd;
 	typeof(&pgtbl_cfg->arm_lpae_s1_cfg.tcr) tcr = &pgtbl_cfg->arm_lpae_s1_cfg.tcr;
 
-	refcount_set(&cfg->cd.refs, 1);
+	refcount_set(&cd->refs, 1);
 
 	/* Prevent SVA from modifying the ASID until it is written to the CD */
 	mutex_lock(&arm_smmu_asid_lock);
-	ret = xa_alloc(&arm_smmu_asid_xa, &asid, &cfg->cd,
+	ret = xa_alloc(&arm_smmu_asid_xa, &asid, cd,
 		       XA_LIMIT(1, (1 << smmu->asid_bits) - 1), GFP_KERNEL);
 	if (ret)
 		goto out_unlock;
 
-	cfg->s1cdmax = master->ssid_bits;
-
-	smmu_domain->stall_enabled = master->stall_enabled;
-
-	ret = arm_smmu_alloc_cd_tables(smmu_domain);
-	if (ret)
-		goto out_free_asid;
-
-	cfg->cd.asid	= (u16)asid;
-	cfg->cd.ttbr	= pgtbl_cfg->arm_lpae_s1_cfg.ttbr;
-	cfg->cd.tcr	= FIELD_PREP(CTXDESC_CD_0_TCR_T0SZ, tcr->tsz) |
+	cd->asid	= (u16)asid;
+	cd->ttbr	= pgtbl_cfg->arm_lpae_s1_cfg.ttbr;
+	cd->tcr		= FIELD_PREP(CTXDESC_CD_0_TCR_T0SZ, tcr->tsz) |
 			  FIELD_PREP(CTXDESC_CD_0_TCR_TG0, tcr->tg) |
 			  FIELD_PREP(CTXDESC_CD_0_TCR_IRGN0, tcr->irgn) |
 			  FIELD_PREP(CTXDESC_CD_0_TCR_ORGN0, tcr->orgn) |
 			  FIELD_PREP(CTXDESC_CD_0_TCR_SH0, tcr->sh) |
 			  FIELD_PREP(CTXDESC_CD_0_TCR_IPS, tcr->ips) |
 			  CTXDESC_CD_0_TCR_EPD1 | CTXDESC_CD_0_AA64;
-	cfg->cd.mair	= pgtbl_cfg->arm_lpae_s1_cfg.mair;
-
-	/*
-	 * Note that this will end up calling arm_smmu_sync_cd() before
-	 * the master has been added to the devices list for this domain.
-	 * This isn't an issue because the STE hasn't been installed yet.
-	 */
-	ret = arm_smmu_write_ctx_desc(smmu_domain, IOMMU_NO_PASID, &cfg->cd);
-	if (ret)
-		goto out_free_cd_tables;
+	cd->mair	= pgtbl_cfg->arm_lpae_s1_cfg.mair;
 
 	mutex_unlock(&arm_smmu_asid_lock);
 	return 0;
 
-out_free_cd_tables:
-	arm_smmu_free_cd_tables(smmu_domain);
-out_free_asid:
-	arm_smmu_free_asid(&cfg->cd);
 out_unlock:
 	mutex_unlock(&arm_smmu_asid_lock);
 	return ret;
 }
 
 static int arm_smmu_domain_finalise_s2(struct arm_smmu_domain *smmu_domain,
-				       struct arm_smmu_master *master,
 				       struct io_pgtable_cfg *pgtbl_cfg)
 {
 	int vmid;
···
 	return 0;
 }
 
-static int arm_smmu_domain_finalise(struct iommu_domain *domain,
-				    struct arm_smmu_master *master)
+static int arm_smmu_domain_finalise(struct iommu_domain *domain)
 {
 	int ret;
 	unsigned long ias, oas;
···
 	struct io_pgtable_cfg pgtbl_cfg;
 	struct io_pgtable_ops *pgtbl_ops;
 	int (*finalise_stage_fn)(struct arm_smmu_domain *,
-				 struct arm_smmu_master *,
 				 struct io_pgtable_cfg *);
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
···
 	domain->geometry.aperture_end = (1UL << pgtbl_cfg.ias) - 1;
 	domain->geometry.force_aperture = true;
 
-	ret = finalise_stage_fn(smmu_domain, master, &pgtbl_cfg);
+	ret = finalise_stage_fn(smmu_domain, &pgtbl_cfg);
 	if (ret < 0) {
 		free_io_pgtable_ops(pgtbl_ops);
 		return ret;
···
 	master->domain = NULL;
 	master->ats_enabled = false;
 	arm_smmu_install_ste_for_dev(master);
+	/*
+	 * Clearing the CD entry isn't strictly required to detach the domain
+	 * since the table is uninstalled anyway, but it helps avoid confusion
+	 * in the call to arm_smmu_write_ctx_desc on the next attach (which
+	 * expects the entry to be empty).
+	 */
+	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 && master->cd_table.cdtab)
+		arm_smmu_write_ctx_desc(master, IOMMU_NO_PASID, NULL);
 }
 
 static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
···
 
 	if (!smmu_domain->smmu) {
 		smmu_domain->smmu = smmu;
-		ret = arm_smmu_domain_finalise(domain, master);
-		if (ret) {
+		ret = arm_smmu_domain_finalise(domain);
+		if (ret)
 			smmu_domain->smmu = NULL;
-			goto out_unlock;
-		}
-	} else if (smmu_domain->smmu != smmu) {
+	} else if (smmu_domain->smmu != smmu)
 		ret = -EINVAL;
-		goto out_unlock;
-	} else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
-		   master->ssid_bits != smmu_domain->s1_cfg.s1cdmax) {
-		ret = -EINVAL;
-		goto out_unlock;
-	} else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
-		   smmu_domain->stall_enabled != master->stall_enabled) {
-		ret = -EINVAL;
-		goto out_unlock;
-	}
+
+	mutex_unlock(&smmu_domain->init_mutex);
+	if (ret)
+		return ret;
 
 	master->domain = smmu_domain;
 
···
 	if (smmu_domain->stage != ARM_SMMU_DOMAIN_BYPASS)
 		master->ats_enabled = arm_smmu_ats_supported(master);
 
-	arm_smmu_install_ste_for_dev(master);
-
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
 	list_add(&master->domain_head, &smmu_domain->devices);
 	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 
-	arm_smmu_enable_ats(master);
+	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
+		if (!master->cd_table.cdtab) {
+			ret = arm_smmu_alloc_cd_tables(master);
+			if (ret) {
+				master->domain = NULL;
+				goto out_list_del;
+			}
+		}
 
-out_unlock:
-	mutex_unlock(&smmu_domain->init_mutex);
+		/*
+		 * Prevent SVA from concurrently modifying the CD or writing to
+		 * the CD entry
+		 */
+		mutex_lock(&arm_smmu_asid_lock);
+		ret = arm_smmu_write_ctx_desc(master, IOMMU_NO_PASID, &smmu_domain->cd);
+		mutex_unlock(&arm_smmu_asid_lock);
+		if (ret) {
+			master->domain = NULL;
+			goto out_list_del;
+		}
+	}
+
+	arm_smmu_install_ste_for_dev(master);
+
+	arm_smmu_enable_ats(master);
+	return 0;
+
+out_list_del:
+	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+	list_del(&master->domain_head);
+	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+
 	return ret;
 }
 
···
 	arm_smmu_detach_dev(master);
 	arm_smmu_disable_pasid(master);
 	arm_smmu_remove_master(master);
+	if (master->cd_table.cdtab)
+		arm_smmu_free_cd_tables(master);
 	kfree(master);
 }
 

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h

···
 	dma_addr_t			cdtab_dma;
 	struct arm_smmu_l1_ctx_desc	*l1_desc;
 	unsigned int			num_l1_ents;
-};
-
-struct arm_smmu_s1_cfg {
-	struct arm_smmu_ctx_desc_cfg	cdcfg;
-	struct arm_smmu_ctx_desc	cd;
 	u8				s1fmt;
+	/* log2 of the maximum number of CDs supported by this table */
 	u8				s1cdmax;
+	/* Whether CD entries in this table have the stall bit set. */
+	u8				stall_enabled:1;
 };
 
 struct arm_smmu_s2_cfg {
···
 	struct arm_smmu_domain		*domain;
 	struct list_head		domain_head;
 	struct arm_smmu_stream		*streams;
+	/* Locked by the iommu core using the group mutex */
+	struct arm_smmu_ctx_desc_cfg	cd_table;
 	unsigned int			num_streams;
 	bool				ats_enabled;
 	bool				stall_enabled;
···
 	struct mutex			init_mutex; /* Protects smmu pointer */
 
 	struct io_pgtable_ops		*pgtbl_ops;
-	bool				stall_enabled;
 	atomic_t			nr_ats_masters;
 
 	enum arm_smmu_domain_stage	stage;
 	union {
-		struct arm_smmu_s1_cfg	s1_cfg;
-		struct arm_smmu_s2_cfg	s2_cfg;
+		struct arm_smmu_ctx_desc	cd;
+		struct arm_smmu_s2_cfg		s2_cfg;
 	};
 
 	struct iommu_domain		domain;
···
 extern struct mutex arm_smmu_asid_lock;
 extern struct arm_smmu_ctx_desc quiet_cd;
 
-int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, int ssid,
+int arm_smmu_write_ctx_desc(struct arm_smmu_master *smmu_master, int ssid,
 			    struct arm_smmu_ctx_desc *cd);
 void arm_smmu_tlb_inv_asid(struct arm_smmu_device *smmu, u16 asid);
 void arm_smmu_tlb_inv_range_asid(unsigned long iova, size_t size, int asid,

drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c

···
 	{ .compatible = "qcom,sc7280-mss-pil" },
 	{ .compatible = "qcom,sc8180x-mdss" },
 	{ .compatible = "qcom,sc8280xp-mdss" },
+	{ .compatible = "qcom,sdm670-mdss" },
 	{ .compatible = "qcom,sdm845-mdss" },
 	{ .compatible = "qcom,sdm845-mss-pil" },
 	{ .compatible = "qcom,sm6350-mdss" },
···
 	{ .compatible = "qcom,sm6350-smmu-500", .data = &qcom_smmu_500_impl0_data },
 	{ .compatible = "qcom,sm6375-smmu-v2", .data = &qcom_smmu_v2_data },
 	{ .compatible = "qcom,sm6375-smmu-500", .data = &qcom_smmu_500_impl0_data },
+	{ .compatible = "qcom,sm7150-smmu-v2", .data = &qcom_smmu_v2_data },
 	{ .compatible = "qcom,sm8150-smmu-500", .data = &qcom_smmu_500_impl0_data },
 	{ .compatible = "qcom,sm8250-smmu-500", .data = &qcom_smmu_500_impl0_data },
 	{ .compatible = "qcom,sm8350-smmu-500", .data = &qcom_smmu_500_impl0_data },

drivers/iommu/arm/arm-smmu/qcom_iommu.c

···
 	return ret;
 }
 
-static struct iommu_domain *qcom_iommu_domain_alloc(unsigned type)
+static struct iommu_domain *qcom_iommu_domain_alloc_paging(struct device *dev)
 {
 	struct qcom_iommu_domain *qcom_domain;
 
-	if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
-		return NULL;
 	/*
 	 * Allocate the domain and initialise some of its data structures.
 	 * We can't really do anything meaningful until we've added a
···
 
 	return 0;
 }
+
+static int qcom_iommu_identity_attach(struct iommu_domain *identity_domain,
+				      struct device *dev)
+{
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+	struct qcom_iommu_domain *qcom_domain;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+	struct qcom_iommu_dev *qcom_iommu = to_iommu(dev);
+	unsigned int i;
+
+	if (domain == identity_domain || !domain)
+		return 0;
+
+	qcom_domain = to_qcom_iommu_domain(domain);
+	if (WARN_ON(!qcom_domain->iommu))
+		return -EINVAL;
+
+	pm_runtime_get_sync(qcom_iommu->dev);
+	for (i = 0; i < fwspec->num_ids; i++) {
+		struct qcom_iommu_ctx *ctx = to_ctx(qcom_domain, fwspec->ids[i]);
+
+		/* Disable the context bank: */
+		iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0);
+
+		ctx->domain = NULL;
+	}
+	pm_runtime_put_sync(qcom_iommu->dev);
+	return 0;
+}
+
+static struct iommu_domain_ops qcom_iommu_identity_ops = {
+	.attach_dev = qcom_iommu_identity_attach,
+};
+
+static struct iommu_domain qcom_iommu_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &qcom_iommu_identity_ops,
+};
 
 static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova,
 			  phys_addr_t paddr, size_t pgsize, size_t pgcount,
···
 }
 
 static const struct iommu_ops qcom_iommu_ops = {
+	.identity_domain = &qcom_iommu_identity_domain,
 	.capable	= qcom_iommu_capable,
-	.domain_alloc	= qcom_iommu_domain_alloc,
+	.domain_alloc_paging = qcom_iommu_domain_alloc_paging,
 	.probe_device	= qcom_iommu_probe_device,
 	.device_group	= generic_device_group,
 	.of_xlate	= qcom_iommu_of_xlate,

drivers/iommu/dma-iommu.c

···
 	IOMMU_DMA_MSI_COOKIE,
 };
 
+enum iommu_dma_queue_type {
+	IOMMU_DMA_OPTS_PER_CPU_QUEUE,
+	IOMMU_DMA_OPTS_SINGLE_QUEUE,
+};
+
+struct iommu_dma_options {
+	enum iommu_dma_queue_type qt;
+	size_t		fq_size;
+	unsigned int	fq_timeout;
+};
+
 struct iommu_dma_cookie {
 	enum iommu_dma_cookie_type	type;
 	union {
 		/* Full allocator for IOMMU_DMA_IOVA_COOKIE */
 		struct {
 			struct iova_domain	iovad;
-
-			struct iova_fq __percpu *fq;	/* Flush queue */
+			/* Flush queue */
+			union {
+				struct iova_fq	*single_fq;
+				struct iova_fq	__percpu *percpu_fq;
+			};
 			/* Number of TLB flushes that have been started */
 			atomic64_t		fq_flush_start_cnt;
 			/* Number of TLB flushes that have been finished */
···
 
 	/* Domain for flush queue callback; NULL if flush queue not in use */
 	struct iommu_domain		*fq_domain;
+	/* Options for dma-iommu use */
+	struct iommu_dma_options	options;
 	struct mutex			mutex;
 };
 
···
 early_param("iommu.forcedac", iommu_dma_forcedac_setup);
 
 /* Number of entries per flush queue */
-#define IOVA_FQ_SIZE	256
+#define IOVA_DEFAULT_FQ_SIZE	256
+#define IOVA_SINGLE_FQ_SIZE	32768
 
 /* Timeout (in ms) after which entries are flushed from the queue */
-#define IOVA_FQ_TIMEOUT	10
+#define IOVA_DEFAULT_FQ_TIMEOUT	10
+#define IOVA_SINGLE_FQ_TIMEOUT	1000
 
 /* Flush queue entry for deferred flushing */
 struct iova_fq_entry {
···
 
 /* Per-CPU flush queue structure */
 struct iova_fq {
-	struct iova_fq_entry entries[IOVA_FQ_SIZE];
-	unsigned int head, tail;
 	spinlock_t lock;
+	unsigned int head, tail;
+	unsigned int mod_mask;
+	struct iova_fq_entry entries[];
 };
 
 #define fq_ring_for_each(i, fq) \
-	for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) % IOVA_FQ_SIZE)
+	for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) & (fq)->mod_mask)
 
 static inline bool fq_full(struct iova_fq *fq)
 {
 	assert_spin_locked(&fq->lock);
-	return (((fq->tail + 1) % IOVA_FQ_SIZE) == fq->head);
+	return (((fq->tail + 1) & fq->mod_mask) == fq->head);
 }
 
 static inline unsigned int fq_ring_add(struct iova_fq *fq)
···
 
 	assert_spin_locked(&fq->lock);
 
-	fq->tail = (idx + 1) % IOVA_FQ_SIZE;
+	fq->tail = (idx + 1) & fq->mod_mask;
 
 	return idx;
 }
 
-static void fq_ring_free(struct iommu_dma_cookie *cookie, struct iova_fq *fq)
+static void fq_ring_free_locked(struct iommu_dma_cookie *cookie, struct iova_fq *fq)
 {
 	u64 counter = atomic64_read(&cookie->fq_flush_finish_cnt);
 	unsigned int idx;
···
 			       fq->entries[idx].iova_pfn,
 			       fq->entries[idx].pages);
 
-		fq->head = (fq->head + 1) % IOVA_FQ_SIZE;
+		fq->head = (fq->head + 1) & fq->mod_mask;
 	}
+}
+
+static void fq_ring_free(struct iommu_dma_cookie *cookie, struct iova_fq *fq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&fq->lock, flags);
+	fq_ring_free_locked(cookie, fq);
+	spin_unlock_irqrestore(&fq->lock, flags);
 }
 
 static void fq_flush_iotlb(struct iommu_dma_cookie *cookie)
···
 	atomic_set(&cookie->fq_timer_on, 0);
 	fq_flush_iotlb(cookie);
 
-	for_each_possible_cpu(cpu) {
-		unsigned long flags;
-		struct iova_fq *fq;
-
-		fq = per_cpu_ptr(cookie->fq, cpu);
-		spin_lock_irqsave(&fq->lock, flags);
-		fq_ring_free(cookie, fq);
-		spin_unlock_irqrestore(&fq->lock, flags);
+	if (cookie->options.qt == IOMMU_DMA_OPTS_SINGLE_QUEUE) {
+		fq_ring_free(cookie, cookie->single_fq);
+	} else {
+		for_each_possible_cpu(cpu)
+			fq_ring_free(cookie, per_cpu_ptr(cookie->percpu_fq, cpu));
 	}
 }
 
···
 	 */
 	smp_mb();
 
-	fq = raw_cpu_ptr(cookie->fq);
+	if (cookie->options.qt == IOMMU_DMA_OPTS_SINGLE_QUEUE)
+		fq = cookie->single_fq;
+	else
+		fq = raw_cpu_ptr(cookie->percpu_fq);
+
 	spin_lock_irqsave(&fq->lock, flags);
 
 	/*
···
 	 * flushed out on another CPU. This makes the fq_full() check below less
 	 * likely to be true.
 	 */
-	fq_ring_free(cookie, fq);
+	fq_ring_free_locked(cookie, fq);
 
 	if (fq_full(fq)) {
 		fq_flush_iotlb(cookie);
-		fq_ring_free(cookie, fq);
+		fq_ring_free_locked(cookie, fq);
 	}
 
 	idx = fq_ring_add(fq);
···
 	if (!atomic_read(&cookie->fq_timer_on) &&
 	    !atomic_xchg(&cookie->fq_timer_on, 1))
 		mod_timer(&cookie->fq_timer,
-			  jiffies + msecs_to_jiffies(IOVA_FQ_TIMEOUT));
+			  jiffies + msecs_to_jiffies(cookie->options.fq_timeout));
 }
 
-static void iommu_dma_free_fq(struct iommu_dma_cookie *cookie)
+static void iommu_dma_free_fq_single(struct iova_fq *fq)
+{
+	int idx;
+
+	fq_ring_for_each(idx, fq)
+		put_pages_list(&fq->entries[idx].freelist);
+	vfree(fq);
+}
+
+static void iommu_dma_free_fq_percpu(struct iova_fq __percpu *percpu_fq)
 {
 	int cpu, idx;
 
-	if (!cookie->fq)
-		return;
-
-	del_timer_sync(&cookie->fq_timer);
 	/* The IOVAs will be torn down separately, so just free our queued pages */
 	for_each_possible_cpu(cpu) {
-		struct iova_fq *fq = per_cpu_ptr(cookie->fq, cpu);
+		struct iova_fq *fq = per_cpu_ptr(percpu_fq, cpu);
 
 		fq_ring_for_each(idx, fq)
 			put_pages_list(&fq->entries[idx].freelist);
 	}
 
-	free_percpu(cookie->fq);
+	free_percpu(percpu_fq);
+}
+
+static void iommu_dma_free_fq(struct iommu_dma_cookie *cookie)
+{
+	if (!cookie->fq_domain)
+		return;
+
+	del_timer_sync(&cookie->fq_timer);
+	if (cookie->options.qt == IOMMU_DMA_OPTS_SINGLE_QUEUE)
+		iommu_dma_free_fq_single(cookie->single_fq);
+	else
+		iommu_dma_free_fq_percpu(cookie->percpu_fq);
+}
+
+static void iommu_dma_init_one_fq(struct iova_fq *fq, size_t fq_size)
+{
+	int i;
+
+	fq->head = 0;
+	fq->tail = 0;
+	fq->mod_mask = fq_size - 1;
+
+	spin_lock_init(&fq->lock);
+
+	for (i = 0; i < fq_size; i++)
+		INIT_LIST_HEAD(&fq->entries[i].freelist);
+}
+
+static int iommu_dma_init_fq_single(struct iommu_dma_cookie *cookie)
+{
+	size_t fq_size = cookie->options.fq_size;
+	struct iova_fq *queue;
+
+	queue = vmalloc(struct_size(queue, entries, fq_size));
+	if (!queue)
+		return -ENOMEM;
+	iommu_dma_init_one_fq(queue, fq_size);
+	cookie->single_fq = queue;
+
+	return 0;
+}
+
+static int iommu_dma_init_fq_percpu(struct iommu_dma_cookie *cookie)
+{
+	size_t fq_size = cookie->options.fq_size;
+	struct iova_fq __percpu *queue;
+	int cpu;
+
+	queue = __alloc_percpu(struct_size(queue, entries, fq_size),
+			       __alignof__(*queue));
+	if (!queue)
+		return -ENOMEM;
+
+	for_each_possible_cpu(cpu)
+		iommu_dma_init_one_fq(per_cpu_ptr(queue, cpu), fq_size);
+	cookie->percpu_fq = queue;
+	return 0;
 }
 
 /* sysfs updates are serialised by the mutex of the group owning @domain */
 int iommu_dma_init_fq(struct iommu_domain *domain)
 {
 	struct iommu_dma_cookie *cookie = domain->iova_cookie;
-	struct iova_fq __percpu *queue;
-	int i, cpu;
+	int rc;
 
 	if (cookie->fq_domain)
 		return 0;
···
 	atomic64_set(&cookie->fq_flush_start_cnt,  0);
 	atomic64_set(&cookie->fq_flush_finish_cnt, 0);
 
-	queue = alloc_percpu(struct iova_fq);
-	if (!queue) {
+	if (cookie->options.qt == IOMMU_DMA_OPTS_SINGLE_QUEUE)
+		rc = iommu_dma_init_fq_single(cookie);
+	else
+		rc = iommu_dma_init_fq_percpu(cookie);
+
+	if (rc) {
 		pr_warn("iova flush queue initialization failed\n");
 		return -ENOMEM;
 	}
-
-	for_each_possible_cpu(cpu) {
-		struct iova_fq *fq = per_cpu_ptr(queue, cpu);
-
-		fq->head = 0;
-		fq->tail = 0;
-
-		spin_lock_init(&fq->lock);
-
-		for (i = 0; i < IOVA_FQ_SIZE; i++)
-			INIT_LIST_HEAD(&fq->entries[i].freelist);
-	}
-
-	cookie->fq = queue;
 
 	timer_setup(&cookie->fq_timer, fq_flush_timeout, 0);
 	atomic_set(&cookie->fq_timer_on, 0);
···
 }
 
 /**
+ * iommu_dma_init_options - Initialize dma-iommu options
+ * @options: The options to be initialized
+ * @dev: Device the options are set for
+ *
+ * This allows tuning dma-iommu specific to device properties
+ */
+static void iommu_dma_init_options(struct iommu_dma_options *options,
+				   struct device *dev)
+{
+	/* Shadowing IOTLB flushes do better with a single large queue */
+	if (dev->iommu->shadow_on_flush) {
+		options->qt = IOMMU_DMA_OPTS_SINGLE_QUEUE;
+		options->fq_timeout = IOVA_SINGLE_FQ_TIMEOUT;
+		options->fq_size = IOVA_SINGLE_FQ_SIZE;
+	} else {
+		options->qt = IOMMU_DMA_OPTS_PER_CPU_QUEUE;
+		options->fq_size = IOVA_DEFAULT_FQ_SIZE;
+		options->fq_timeout = IOVA_DEFAULT_FQ_TIMEOUT;
+	}
+}
+
+/**
  * iommu_dma_init_domain - Initialise a DMA mapping domain
  * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie()
  * @base: IOVA at which the mappable address space starts
···
 	ret = iova_domain_init_rcaches(iovad);
 	if (ret)
 		goto done_unlock;
+
+	iommu_dma_init_options(&cookie->options, dev);
 
 	/* If the FQ fails we can simply fall back to strict mode */
 	if (domain->type == IOMMU_DOMAIN_DMA_FQ &&

drivers/iommu/exynos-iommu.c

···
 
 typedef u32 sysmmu_iova_t;
 typedef u32 sysmmu_pte_t;
+static struct iommu_domain exynos_identity_domain;
 
 /* We do not consider super section mapping (16MB) */
 #define SECT_ORDER 20
···
 		struct exynos_iommu_owner *owner = dev_iommu_priv_get(master);
 
 		mutex_lock(&owner->rpm_lock);
-		if (data->domain) {
+		if (&data->domain->domain != &exynos_identity_domain) {
 			dev_dbg(data->sysmmu, "saving state\n");
 			__sysmmu_disable(data);
 		}
···
 		struct exynos_iommu_owner *owner = dev_iommu_priv_get(master);
 
 		mutex_lock(&owner->rpm_lock);
-		if (data->domain) {
+		if (&data->domain->domain != &exynos_identity_domain) {
 			dev_dbg(data->sysmmu, "restoring state\n");
 			__sysmmu_enable(data);
 		}
···
 				   DMA_TO_DEVICE);
 }
 
-static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type)
+static struct iommu_domain *exynos_iommu_domain_alloc_paging(struct device *dev)
 {
 	struct exynos_iommu_domain *domain;
 	dma_addr_t handle;
···
 
 	/* Check if correct PTE offsets are initialized */
 	BUG_ON(PG_ENT_SHIFT < 0 || !dma_dev);
-
-	if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
 	if (!domain)
···
 	kfree(domain);
 }
 
-static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain,
-				    struct device *dev)
+static int exynos_iommu_identity_attach(struct iommu_domain *identity_domain,
+					struct device *dev)
 {
-	struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
 	struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
-	phys_addr_t pagetable = virt_to_phys(domain->pgtable);
+	struct exynos_iommu_domain *domain;
+	phys_addr_t pagetable;
 	struct sysmmu_drvdata *data, *next;
 	unsigned long flags;
 
-	if (!has_sysmmu(dev) || owner->domain != iommu_domain)
-		return;
+	if (owner->domain == identity_domain)
+		return 0;
+
+	domain = to_exynos_domain(owner->domain);
+	pagetable = virt_to_phys(domain->pgtable);
 
 	mutex_lock(&owner->rpm_lock);
 
···
 		list_del_init(&data->domain_node);
 		spin_unlock(&data->lock);
 	}
-	owner->domain = NULL;
+	owner->domain = identity_domain;
 	spin_unlock_irqrestore(&domain->lock, flags);
 
 	mutex_unlock(&owner->rpm_lock);
 
-	dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", __func__,
-		&pagetable);
+	dev_dbg(dev, "%s: Restored IOMMU to IDENTITY from pgtable %pa\n",
+		__func__, &pagetable);
+	return 0;
 }
+
+static struct iommu_domain_ops exynos_identity_ops = {
+	.attach_dev = exynos_iommu_identity_attach,
+};
+
+static struct iommu_domain exynos_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &exynos_identity_ops,
+};
 
 static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain,
 				   struct device *dev)
···
 	struct sysmmu_drvdata *data;
 	phys_addr_t pagetable = virt_to_phys(domain->pgtable);
 	unsigned long flags;
+	int err;
 
-	if (!has_sysmmu(dev))
-		return -ENODEV;
-
-	if (owner->domain)
-		exynos_iommu_detach_device(owner->domain, dev);
+	err = exynos_iommu_identity_attach(&exynos_identity_domain, dev);
+	if (err)
+		return err;
 
 	mutex_lock(&owner->rpm_lock);
 
···
  */
 static int exynos_iommu_map(struct iommu_domain *iommu_domain,
 			    unsigned long l_iova, phys_addr_t paddr, size_t size,
-			    int prot, gfp_t gfp)
+			    size_t count, int prot, gfp_t gfp, size_t *mapped)
 {
 	struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
 	sysmmu_pte_t *entry;
···
 	if (ret)
 		pr_err("%s: Failed(%d) to map %#zx bytes @ %#x\n",
 			__func__, ret, size, iova);
+	else
+		*mapped = size;
 
 	spin_unlock_irqrestore(&domain->pgtablelock, flags);
 
···
 }
 
 static size_t exynos_iommu_unmap(struct iommu_domain *iommu_domain,
-				 unsigned long l_iova, size_t size,
+				 unsigned long l_iova, size_t size, size_t count,
 				 struct iommu_iotlb_gather *gather)
 {
 	struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
···
 	return &data->iommu;
 }
 
-static void exynos_iommu_set_platform_dma(struct device *dev)
-{
-	struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
-
-	if (owner->domain) {
-		struct iommu_group *group = iommu_group_get(dev);
-
-		if (group) {
-			exynos_iommu_detach_device(owner->domain, dev);
-			iommu_group_put(group);
-		}
-	}
-}
-
 static void exynos_iommu_release_device(struct device *dev)
 {
 	struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
 	struct sysmmu_drvdata *data;
 
-	exynos_iommu_set_platform_dma(dev);
+	WARN_ON(exynos_iommu_identity_attach(&exynos_identity_domain, dev));
 
 	list_for_each_entry(data, &owner->controllers, owner_node)
 		device_link_del(data->link);
···
 
 		INIT_LIST_HEAD(&owner->controllers);
 		mutex_init(&owner->rpm_lock);
+		owner->domain = &exynos_identity_domain;
 		dev_iommu_priv_set(dev, owner);
 	}
 
···
 }
 
 static const struct iommu_ops exynos_iommu_ops = {
-	.domain_alloc = exynos_iommu_domain_alloc,
+	.identity_domain = &exynos_identity_domain,
+	.domain_alloc_paging = exynos_iommu_domain_alloc_paging,
 	.device_group = generic_device_group,
-#ifdef CONFIG_ARM
-	.set_platform_dma_ops = exynos_iommu_set_platform_dma,
-#endif
 	.probe_device = exynos_iommu_probe_device,
 	.release_device = exynos_iommu_release_device,
 	.pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
 	.of_xlate = exynos_iommu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= exynos_iommu_attach_device,
-		.map		= exynos_iommu_map,
-		.unmap		= exynos_iommu_unmap,
+		.map_pages	= exynos_iommu_map,
+		.unmap_pages	= exynos_iommu_unmap,
 		.iova_to_phys	= exynos_iommu_iova_to_phys,
 		.free		= exynos_iommu_domain_free,
 	}

drivers/iommu/fsl_pamu_domain.c

···
 {
 	struct fsl_dma_domain *dma_domain;
 
+	/*
+	 * FIXME: This isn't creating an unmanaged domain since the
+	 * default_domain_ops do not have any map/unmap function it doesn't meet
+	 * the requirements for __IOMMU_DOMAIN_PAGING. The only purpose seems to
+	 * allow drivers/soc/fsl/qbman/qman_portal.c to do
+	 * fsl_pamu_configure_l1_stash()
+	 */
 	if (type != IOMMU_DOMAIN_UNMANAGED)
 		return NULL;
 
···
 	return ret;
 }
 
-static void fsl_pamu_set_platform_dma(struct device *dev)
+/*
+ * FIXME: fsl/pamu is completely broken in terms of how it works with the iommu
+ * API. Immediately after probe the HW is left in an IDENTITY translation and
+ * the driver provides a non-working UNMANAGED domain that it can switch over
+ * to. However it cannot switch back to an IDENTITY translation, instead it
+ * switches to what looks like BLOCKING.
+ */
+static int fsl_pamu_platform_attach(struct iommu_domain *platform_domain,
+				    struct device *dev)
 {
 	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
-	struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
+	struct fsl_dma_domain *dma_domain;
 	const u32 *prop;
 	int len;
 	struct pci_dev *pdev = NULL;
 	struct pci_controller *pci_ctl;
+
+	/*
+	 * Hack to keep things working as they always have, only leaving an
+	 * UNMANAGED domain makes it BLOCKING.
+	 */
+	if (domain == platform_domain || !domain ||
+	    domain->type != IOMMU_DOMAIN_UNMANAGED)
+		return 0;
+
+	dma_domain = to_fsl_dma_domain(domain);
 
 	/*
 	 * Use LIODN of the PCI controller while detaching a
···
 		detach_device(dev, dma_domain);
 	else
 		pr_debug("missing fsl,liodn property at %pOF\n", dev->of_node);
+	return 0;
 }
+
+static struct iommu_domain_ops fsl_pamu_platform_ops = {
+	.attach_dev = fsl_pamu_platform_attach,
+};
+
+static struct iommu_domain fsl_pamu_platform_domain = {
+	.type = IOMMU_DOMAIN_PLATFORM,
+	.ops = &fsl_pamu_platform_ops,
+};
 
 /* Set the domain stash attribute */
 int fsl_pamu_configure_l1_stash(struct iommu_domain *domain, u32 cpu)
···
 }
 
 static const struct iommu_ops fsl_pamu_ops = {
+	.default_domain = &fsl_pamu_platform_domain,
 	.capable	= fsl_pamu_capable,
 	.domain_alloc	= fsl_pamu_domain_alloc,
 	.probe_device	= fsl_pamu_probe_device,
 	.device_group   = fsl_pamu_device_group,
-	.set_platform_dma_ops = fsl_pamu_set_platform_dma,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= fsl_pamu_attach_device,
 		.iova_to_phys	= fsl_pamu_iova_to_phys,

drivers/iommu/intel/debugfs.c

···
 	IOMMU_REGSET_ENTRY(VCRSP),
 };
 
+static struct dentry *intel_iommu_debug;
+
 static int iommu_regset_show(struct seq_file *m, void *unused)
 {
 	struct dmar_drhd_unit *drhd;
···
 static inline void
 dump_page_info(struct seq_file *m, unsigned long iova, u64 *path)
 {
-	seq_printf(m, "0x%013lx |\t0x%016llx\t0x%016llx\t0x%016llx\t0x%016llx\t0x%016llx\n",
-		   iova >> VTD_PAGE_SHIFT, path[5], path[4],
-		   path[3], path[2], path[1]);
+	seq_printf(m, "0x%013lx |\t0x%016llx\t0x%016llx\t0x%016llx",
+		   iova >> VTD_PAGE_SHIFT, path[5], path[4], path[3]);
+	if (path[2]) {
+		seq_printf(m, "\t0x%016llx", path[2]);
+		if (path[1])
+			seq_printf(m, "\t0x%016llx", path[1]);
+	}
+	seq_putc(m, '\n');
 }
 
 static void pgtable_walk_level(struct seq_file *m, struct dma_pte *pde,
···
 	}
 }
 
-static int __show_device_domain_translation(struct device *dev, void *data)
+static int domain_translation_struct_show(struct seq_file *m,
+					  struct device_domain_info *info,
+					  ioasid_t pasid)
 {
-	struct dmar_domain *domain;
-	struct seq_file *m = data;
-	u64 path[6] = { 0 };
+	bool scalable, found = false;
+	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu;
+	u16 devfn, bus, seg;
 
-	domain = to_dmar_domain(iommu_get_domain_for_dev(dev));
-	if (!domain)
-		return 0;
+	bus = info->bus;
+	devfn = info->devfn;
+	seg = info->segment;
 
-	seq_printf(m, "Device %s @0x%llx\n", dev_name(dev),
-		   (u64)virt_to_phys(domain->pgd));
-	seq_puts(m, "IOVA_PFN\t\tPML5E\t\t\tPML4E\t\t\tPDPE\t\t\tPDE\t\t\tPTE\n");
+	rcu_read_lock();
+	for_each_active_iommu(iommu, drhd) {
+		struct context_entry *context;
+		u64 pgd, path[6] = { 0 };
+		u32 sts, agaw;
 
-	pgtable_walk_level(m, domain->pgd, domain->agaw + 2, 0, path);
-	seq_putc(m, '\n');
+		if (seg != iommu->segment)
+			continue;
 
-	/* Don't iterate */
-	return 1;
-}
+		sts = dmar_readl(iommu->reg + DMAR_GSTS_REG);
+		if (!(sts & DMA_GSTS_TES)) {
+			seq_printf(m, "DMA Remapping is not enabled on %s\n",
+				   iommu->name);
+			continue;
+		}
+		if (dmar_readq(iommu->reg + DMAR_RTADDR_REG) & DMA_RTADDR_SMT)
+			scalable = true;
+		else
+			scalable = false;
 
-static int show_device_domain_translation(struct device *dev, void *data)
-{
-	struct iommu_group *group;
-
-	group = iommu_group_get(dev);
-	if (group) {
 		/*
-		 * The group->mutex is held across the callback, which will
-		 * block calls to iommu_attach/detach_group/device. Hence,
+		 * The iommu->lock is held across the callback, which will
+		 * block calls to domain_attach/domain_detach. Hence,
 		 * the domain of the device will not change during traversal.
 		 *
-		 * All devices in an iommu group share a single domain, hence
-		 * we only dump the domain of the first device. Even though,
-		 * this code still possibly races with the iommu_unmap()
+		 * Traversing page table possibly races with the iommu_unmap()
 		 * interface. This could be solved by RCU-freeing the page
 		 * table pages in the iommu_unmap() path.
 		 */
-		iommu_group_for_each_dev(group, data,
-					 __show_device_domain_translation);
-		iommu_group_put(group);
+		spin_lock(&iommu->lock);
+
+		context = iommu_context_addr(iommu, bus, devfn, 0);
+		if (!context || !context_present(context))
+			goto iommu_unlock;
+
+		if (scalable) {	/* scalable mode */
+			struct pasid_entry *pasid_tbl, *pasid_tbl_entry;
+			struct pasid_dir_entry *dir_tbl, *dir_entry;
+			u16 dir_idx, tbl_idx, pgtt;
+			u64 pasid_dir_ptr;
+
+			pasid_dir_ptr = context->lo & VTD_PAGE_MASK;
+
+			/* Dump specified device domain mappings with PASID. */
+			dir_idx = pasid >> PASID_PDE_SHIFT;
+			tbl_idx = pasid & PASID_PTE_MASK;
+
+			dir_tbl = phys_to_virt(pasid_dir_ptr);
+			dir_entry = &dir_tbl[dir_idx];
+
+			pasid_tbl = get_pasid_table_from_pde(dir_entry);
+			if (!pasid_tbl)
+				goto iommu_unlock;
+
+			pasid_tbl_entry = &pasid_tbl[tbl_idx];
+			if (!pasid_pte_is_present(pasid_tbl_entry))
+				goto iommu_unlock;
+
+			/*
+			 * According to PASID Granular Translation Type(PGTT),
+			 * get the page table pointer.
+			 */
+			pgtt = (u16)(pasid_tbl_entry->val[0] & GENMASK_ULL(8, 6)) >> 6;
+			agaw = (u8)(pasid_tbl_entry->val[0] & GENMASK_ULL(4, 2)) >> 2;
+
+			switch (pgtt) {
+			case PASID_ENTRY_PGTT_FL_ONLY:
+				pgd = pasid_tbl_entry->val[2];
+				break;
+			case PASID_ENTRY_PGTT_SL_ONLY:
+			case PASID_ENTRY_PGTT_NESTED:
+				pgd = pasid_tbl_entry->val[0];
+				break;
+			default:
+				goto iommu_unlock;
+			}
+			pgd &= VTD_PAGE_MASK;
+		} else { /* legacy mode */
+			pgd = context->lo & VTD_PAGE_MASK;
+			agaw = context->hi & 7;
+		}
+
+		seq_printf(m, "Device %04x:%02x:%02x.%x ",
+			   iommu->segment, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
+
+		if (scalable)
+			seq_printf(m, "with pasid %x @0x%llx\n", pasid, pgd);
+		else
+			seq_printf(m, "@0x%llx\n", pgd);
+
+		seq_printf(m, "%-17s\t%-18s\t%-18s\t%-18s\t%-18s\t%-s\n",
+			   "IOVA_PFN", "PML5E", "PML4E", "PDPE", "PDE", "PTE");
+		pgtable_walk_level(m, phys_to_virt(pgd), agaw + 2, 0, path);
+
+		found = true;
+iommu_unlock:
+		spin_unlock(&iommu->lock);
+		if (found)
+			break;
 	}
+	rcu_read_unlock();
 
 	return 0;
 }
 
-static int domain_translation_struct_show(struct seq_file *m, void *unused)
+static int dev_domain_translation_struct_show(struct seq_file *m, void *unused)
 {
-	return bus_for_each_dev(&pci_bus_type, NULL, m,
-				show_device_domain_translation);
+	struct device_domain_info *info = (struct device_domain_info *)m->private;
+
+	return domain_translation_struct_show(m, info, IOMMU_NO_PASID);
 }
-DEFINE_SHOW_ATTRIBUTE(domain_translation_struct);
+DEFINE_SHOW_ATTRIBUTE(dev_domain_translation_struct);
+
+static int pasid_domain_translation_struct_show(struct seq_file *m, void *unused)
+{
+	struct dev_pasid_info *dev_pasid = (struct dev_pasid_info *)m->private;
+	struct device_domain_info *info = dev_iommu_priv_get(dev_pasid->dev);
+
+	return domain_translation_struct_show(m, info, dev_pasid->pasid);
+}
+DEFINE_SHOW_ATTRIBUTE(pasid_domain_translation_struct);
 
 static void invalidation_queue_entry_show(struct seq_file *m,
 					  struct intel_iommu *iommu)
···
 
 void __init intel_iommu_debugfs_init(void)
 {
-	struct dentry *intel_iommu_debug = debugfs_create_dir("intel",
-						iommu_debugfs_dir);
+	intel_iommu_debug = debugfs_create_dir("intel", iommu_debugfs_dir);
 
 	debugfs_create_file("iommu_regset", 0444, intel_iommu_debug, NULL,
 			    &iommu_regset_fops);
 	debugfs_create_file("dmar_translation_struct", 0444, intel_iommu_debug,
 			    NULL, &dmar_translation_struct_fops);
-	debugfs_create_file("domain_translation_struct", 0444,
-			    intel_iommu_debug, NULL,
-			    &domain_translation_struct_fops);
 	debugfs_create_file("invalidation_queue", 0444, intel_iommu_debug,
 			    NULL, &invalidation_queue_fops);
 #ifdef CONFIG_IRQ_REMAP
···
 #endif
 	debugfs_create_file("dmar_perf_latency", 0644, intel_iommu_debug,
 			    NULL, &dmar_perf_latency_fops);
+}
+
+/*
+ * Create a debugfs directory for each device, and then create a
+ * debugfs file in this directory for users to dump the page table
+ * of the default domain. e.g.
+ * /sys/kernel/debug/iommu/intel/0000:00:01.0/domain_translation_struct
+ */
+void intel_iommu_debugfs_create_dev(struct device_domain_info *info)
+{
+	info->debugfs_dentry = debugfs_create_dir(dev_name(info->dev), intel_iommu_debug);
+
+	debugfs_create_file("domain_translation_struct", 0444, info->debugfs_dentry,
+			    info, &dev_domain_translation_struct_fops);
+}
+
+/* Remove the device debugfs directory. */
+void intel_iommu_debugfs_remove_dev(struct device_domain_info *info)
+{
+	debugfs_remove_recursive(info->debugfs_dentry);
+}
+
+/*
+ * Create a debugfs directory per pair of {device, pasid}, then create the
+ * corresponding debugfs file in this directory for users to dump its page
+ * table. e.g.
+ * /sys/kernel/debug/iommu/intel/0000:00:01.0/1/domain_translation_struct
+ *
+ * The debugfs only dumps the page tables whose mappings are created and
+ * destroyed by the iommu_map/unmap() interfaces. Check the mapping type
+ * of the domain before creating debugfs directory.
+ */
+void intel_iommu_debugfs_create_dev_pasid(struct dev_pasid_info *dev_pasid)
+{
+	struct device_domain_info *info = dev_iommu_priv_get(dev_pasid->dev);
+	char dir_name[10];
+
+	sprintf(dir_name, "%x", dev_pasid->pasid);
+	dev_pasid->debugfs_dentry = debugfs_create_dir(dir_name, info->debugfs_dentry);
+
+	debugfs_create_file("domain_translation_struct", 0444, dev_pasid->debugfs_dentry,
+			    dev_pasid, &pasid_domain_translation_struct_fops);
+}
+
+/* Remove the device pasid debugfs directory. */
+void intel_iommu_debugfs_remove_dev_pasid(struct dev_pasid_info *dev_pasid)
+{
+	debugfs_remove_recursive(dev_pasid->debugfs_dentry);
 }

drivers/iommu/intel/iommu.c

···
 }
 
 static struct iommu_domain blocking_domain = {
+	.type = IOMMU_DOMAIN_BLOCKED,
 	.ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= blocking_domain_attach_dev,
-		.free		= intel_iommu_domain_free
 	}
 };
 
···
 	struct iommu_domain *domain;
 
 	switch (type) {
-	case IOMMU_DOMAIN_BLOCKED:
-		return &blocking_domain;
 	case IOMMU_DOMAIN_DMA:
 	case IOMMU_DOMAIN_UNMANAGED:
 		dmar_domain = alloc_domain(type);
···
 
 static void intel_iommu_domain_free(struct iommu_domain *domain)
 {
-	if (domain != &si_domain->domain && domain != &blocking_domain)
+	if (domain != &si_domain->domain)
 		domain_exit(to_dmar_domain(domain));
 }
 
···
 		}
 	}
 
+	intel_iommu_debugfs_create_dev(info);
+
 	return &iommu->iommu;
 }
 
···
 
 	dmar_remove_one_dev_info(dev);
 	intel_pasid_free_table(dev);
+	intel_iommu_debugfs_remove_dev(info);
 	dev_iommu_priv_set(dev, NULL);
 	kfree(info);
 	set_dma_ops(dev, NULL);
···
 	return false;
 }
 
-static void intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
-				       unsigned long iova, size_t size)
+static int intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
+				      unsigned long iova, size_t size)
 {
 	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
 	unsigned long pages = aligned_nrpages(iova, size);
···
 
 	xa_for_each(&dmar_domain->iommu_array, i, info)
 		__mapping_notify_one(info->iommu, dmar_domain, pfn, pages);
+	return 0;
 }
 
 static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid)
···
 	spin_unlock_irqrestore(&dmar_domain->lock, flags);
 
 	domain_detach_iommu(dmar_domain, iommu);
+	intel_iommu_debugfs_remove_dev_pasid(dev_pasid);
 	kfree(dev_pasid);
 out_tear_down:
 	intel_pasid_tear_down_entry(iommu, dev, pasid, false);
···
 	list_add(&dev_pasid->link_domain, &dmar_domain->dev_pasids);
 	spin_unlock_irqrestore(&dmar_domain->lock, flags);
 
+	if (domain->type & __IOMMU_DOMAIN_PAGING)
+		intel_iommu_debugfs_create_dev_pasid(dev_pasid);
+
 	return 0;
 out_detach_iommu:
 	domain_detach_iommu(dmar_domain, iommu);
···
 }
 
 const struct iommu_ops intel_iommu_ops = {
+	.blocked_domain		= &blocking_domain,
 	.capable		= intel_iommu_capable,
 	.hw_info		= intel_iommu_hw_info,
 	.domain_alloc		= intel_iommu_domain_alloc,

drivers/iommu/intel/iommu.h

···
 	struct intel_iommu *iommu; /* IOMMU used by this device */
 	struct dmar_domain *domain; /* pointer to domain */
 	struct pasid_table *pasid_table; /* pasid table */
+#ifdef CONFIG_INTEL_IOMMU_DEBUGFS
+	struct dentry *debugfs_dentry; /* pointer to device directory dentry */
+#endif
 };
 
 struct dev_pasid_info {
 	struct list_head link_domain;	/* link to domain siblings */
 	struct device *dev;
 	ioasid_t pasid;
+#ifdef CONFIG_INTEL_IOMMU_DEBUGFS
+	struct dentry *debugfs_dentry; /* pointer to pasid directory dentry */
+#endif
 };
 
 static inline void __iommu_flush_cache(
···
 
 #ifdef CONFIG_INTEL_IOMMU_DEBUGFS
 void intel_iommu_debugfs_init(void);
+void intel_iommu_debugfs_create_dev(struct device_domain_info *info);
+void intel_iommu_debugfs_remove_dev(struct device_domain_info *info);
+void intel_iommu_debugfs_create_dev_pasid(struct dev_pasid_info *dev_pasid);
+void intel_iommu_debugfs_remove_dev_pasid(struct dev_pasid_info *dev_pasid);
 #else
 static inline void intel_iommu_debugfs_init(void) {}
+static inline void intel_iommu_debugfs_create_dev(struct device_domain_info *info) {}
+static inline void intel_iommu_debugfs_remove_dev(struct device_domain_info *info) {}
+static inline void intel_iommu_debugfs_create_dev_pasid(struct dev_pasid_info *dev_pasid) {}
+static inline void intel_iommu_debugfs_remove_dev_pasid(struct dev_pasid_info *dev_pasid) {}
 #endif /* CONFIG_INTEL_IOMMU_DEBUGFS */
 
 extern const struct attribute_group *intel_iommu_groups[];

drivers/iommu/iommu.c

···
 #include "iommu-priv.h"
 
 #include "iommu-sva.h"
-#include "iommu-priv.h"
 
 static struct kset *iommu_group_kset;
 static DEFINE_IDA(iommu_group_ida);
···
 static int iommu_bus_notifier(struct notifier_block *nb,
 			      unsigned long action, void *data);
 static void iommu_release_device(struct device *dev);
-static struct iommu_domain *__iommu_domain_alloc(const struct bus_type *bus,
-						 unsigned type);
+static struct iommu_domain *
+__iommu_group_domain_alloc(struct iommu_group *group, unsigned int type);
 static int __iommu_attach_device(struct iommu_domain *domain,
 				 struct device *dev);
 static int __iommu_attach_group(struct iommu_domain *domain,
···
 	case IOMMU_DOMAIN_DMA:
 	case IOMMU_DOMAIN_DMA_FQ:
 		return "Translated";
+	case IOMMU_DOMAIN_PLATFORM:
+		return "Platform";
 	default:
 		return "Unknown";
 	}
···
 	spin_lock(&iommu_device_lock);
 	list_del(&iommu->list);
 	spin_unlock(&iommu_device_lock);
+
+	/* Pairs with the alloc in generic_single_device_group() */
+	iommu_group_put(iommu->singleton_group);
+	iommu->singleton_group = NULL;
 }
 EXPORT_SYMBOL_GPL(iommu_device_unregister);
 
···
 		ret = PTR_ERR(iommu_dev);
 		goto err_module_put;
 	}
+	dev->iommu->iommu_dev = iommu_dev;
 
 	ret = iommu_device_link(iommu_dev, dev);
 	if (ret)
···
 	}
 	dev->iommu_group = group;
 
-	dev->iommu->iommu_dev = iommu_dev;
 	dev->iommu->max_pasids = dev_iommu_get_max_pasids(dev);
 	if (ops->is_attach_deferred)
 		dev->iommu->attach_deferred = ops->is_attach_deferred(dev);
···
 err_module_put:
 	module_put(ops->owner);
 err_free:
+	dev->iommu->iommu_dev = NULL;
 	dev_iommu_free(dev);
 	return ret;
 }
···
 EXPORT_SYMBOL_GPL(generic_device_group);
 
 /*
+ * Generic device_group call-back function. It just allocates one
+ * iommu-group per iommu driver instance shared by every device
+ * probed by that iommu driver.
+ */
+struct iommu_group *generic_single_device_group(struct device *dev)
+{
+	struct iommu_device *iommu = dev->iommu->iommu_dev;
+
+	if (!iommu->singleton_group) {
+		struct iommu_group *group;
+
+		group = iommu_group_alloc();
+		if (IS_ERR(group))
+			return group;
+		iommu->singleton_group = group;
+	}
+	return iommu_group_ref_get(iommu->singleton_group);
+}
+EXPORT_SYMBOL_GPL(generic_single_device_group);
+
+/*
  * Use standard PCI bus topology, isolation features, and DMA alias quirks
  * to find or create an IOMMU group for a device.
  */
···
 }
 EXPORT_SYMBOL_GPL(fsl_mc_device_group);
 
-static int iommu_get_def_domain_type(struct device *dev)
-{
-	const struct iommu_ops *ops = dev_iommu_ops(dev);
-
-	if (dev_is_pci(dev) && to_pci_dev(dev)->untrusted)
-		return IOMMU_DOMAIN_DMA;
-
-	if (ops->def_domain_type)
-		return ops->def_domain_type(dev);
-
-	return 0;
-}
-
 static struct iommu_domain *
-__iommu_group_alloc_default_domain(const struct bus_type *bus,
-				   struct iommu_group *group, int req_type)
+__iommu_group_alloc_default_domain(struct iommu_group *group, int req_type)
 {
 	if (group->default_domain && group->default_domain->type == req_type)
 		return group->default_domain;
-	return __iommu_domain_alloc(bus, req_type);
+	return __iommu_group_domain_alloc(group, req_type);
+}
+
+/*
+ * Returns the iommu_ops for the devices in an iommu group.
+ *
+ * It is assumed that all devices in an iommu group are managed by a single
+ * IOMMU unit. Therefore, this returns the dev_iommu_ops of the first device
+ * in the group.
+ */
+static const struct iommu_ops *group_iommu_ops(struct iommu_group *group)
+{
+	struct group_device *device =
+		list_first_entry(&group->devices, struct group_device, list);
+
+	lockdep_assert_held(&group->mutex);
+
+	return dev_iommu_ops(device->dev);
 }
 
 /*
···
 static struct iommu_domain *
 iommu_group_alloc_default_domain(struct iommu_group *group, int req_type)
 {
-	const struct bus_type *bus =
-		list_first_entry(&group->devices, struct group_device, list)
-			->dev->bus;
+	const struct iommu_ops *ops = group_iommu_ops(group);
 	struct iommu_domain *dom;
 
 	lockdep_assert_held(&group->mutex);
 
+	/*
+	 * Allow legacy drivers to specify the domain that will be the default
+	 * domain. This should always be either an IDENTITY/BLOCKED/PLATFORM
+	 * domain. Do not use in new drivers.
+	 */
+	if (ops->default_domain) {
+		if (req_type)
+			return NULL;
+		return ops->default_domain;
+	}
+
 	if (req_type)
-		return __iommu_group_alloc_default_domain(bus, group, req_type);
+		return __iommu_group_alloc_default_domain(group, req_type);
 
 	/* The driver gave no guidance on what type to use, try the default */
-	dom = __iommu_group_alloc_default_domain(bus, group, iommu_def_domain_type);
+	dom = __iommu_group_alloc_default_domain(group, iommu_def_domain_type);
 	if (dom)
 		return dom;
 
 	/* Otherwise IDENTITY and DMA_FQ defaults will try DMA */
 	if (iommu_def_domain_type == IOMMU_DOMAIN_DMA)
 		return NULL;
-	dom = __iommu_group_alloc_default_domain(bus, group, IOMMU_DOMAIN_DMA);
+	dom = __iommu_group_alloc_default_domain(group, IOMMU_DOMAIN_DMA);
 	if (!dom)
 		return NULL;
 
···
 	return 0;
 }
 
-/* A target_type of 0 will select the best domain type and cannot fail */
+/*
+ * Combine the driver's chosen def_domain_type across all the devices in a
+ * group. Drivers must give a consistent result.
+ */
+static int iommu_get_def_domain_type(struct iommu_group *group,
+				     struct device *dev, int cur_type)
+{
+	const struct iommu_ops *ops = group_iommu_ops(group);
+	int type;
+
+	if (!ops->def_domain_type)
+		return cur_type;
+
+	type = ops->def_domain_type(dev);
+	if (!type || cur_type == type)
+		return cur_type;
+	if (!cur_type)
+		return type;
+
+	dev_err_ratelimited(
+		dev,
+		"IOMMU driver error, requesting conflicting def_domain_type, %s and %s, for devices in group %u.\n",
+		iommu_domain_type_str(cur_type), iommu_domain_type_str(type),
+		group->id);
+
+	/*
+	 * Try to recover, drivers are allowed to force IDENITY or DMA, IDENTITY
+	 * takes precedence.
+	 */
+	if (type == IOMMU_DOMAIN_IDENTITY)
+		return type;
+	return cur_type;
+}
+
+/*
+ * A target_type of 0 will select the best domain type. 0 can be returned in
+ * this case meaning the global default should be used.
+ */
 static int iommu_get_default_domain_type(struct iommu_group *group,
 					 int target_type)
 {
-	int best_type = target_type;
+	struct device *untrusted = NULL;
 	struct group_device *gdev;
-	struct device *last_dev;
+	int driver_type = 0;
 
 	lockdep_assert_held(&group->mutex);
 
-	for_each_group_device(group, gdev) {
-		unsigned int type = iommu_get_def_domain_type(gdev->dev);
-
-		if (best_type && type && best_type != type) {
-			if (target_type) {
-				dev_err_ratelimited(
-					gdev->dev,
-					"Device cannot be in %s domain\n",
-					iommu_domain_type_str(target_type));
-				return -1;
-			}
-
-			dev_warn(
-				gdev->dev,
-				"Device needs domain type %s, but device %s in the same iommu group requires type %s - using default\n",
-				iommu_domain_type_str(type), dev_name(last_dev),
-				iommu_domain_type_str(best_type));
-			return 0;
-		}
-		if (!best_type)
-			best_type = type;
-		last_dev = gdev->dev;
+	/*
+	 * ARM32 drivers supporting CONFIG_ARM_DMA_USE_IOMMU can declare an
+	 * identity_domain and it will automatically become their default
+	 * domain. Later on ARM_DMA_USE_IOMMU will install its UNMANAGED domain.
+	 * Override the selection to IDENTITY.
+	 */
+	if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
+		static_assert(!(IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) &&
+				IS_ENABLED(CONFIG_IOMMU_DMA)));
+		driver_type = IOMMU_DOMAIN_IDENTITY;
 	}
-	return best_type;
+
+	for_each_group_device(group, gdev) {
+		driver_type = iommu_get_def_domain_type(group, gdev->dev,
+							driver_type);
+
+		if (dev_is_pci(gdev->dev) && to_pci_dev(gdev->dev)->untrusted) {
+			/*
+			 * No ARM32 using systems will set untrusted, it cannot
+			 * work.
+			 */
+			if (WARN_ON(IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)))
+				return -1;
+			untrusted = gdev->dev;
+		}
+	}
+
+	/*
+	 * If the common dma ops are not selected in kconfig then we cannot use
+	 * IOMMU_DOMAIN_DMA at all. Force IDENTITY if nothing else has been
+	 * selected.
+	 */
+	if (!IS_ENABLED(CONFIG_IOMMU_DMA)) {
+		if (WARN_ON(driver_type == IOMMU_DOMAIN_DMA))
+			return -1;
+		if (!driver_type)
+			driver_type = IOMMU_DOMAIN_IDENTITY;
+	}
+
+	if (untrusted) {
+		if (driver_type && driver_type != IOMMU_DOMAIN_DMA) {
+			dev_err_ratelimited(
+				untrusted,
+				"Device is not trusted, but driver is overriding group %u to %s, refusing to probe.\n",
+				group->id, iommu_domain_type_str(driver_type));
+			return -1;
+		}
+		driver_type = IOMMU_DOMAIN_DMA;
+	}
+
+	if (target_type) {
+		if (driver_type && target_type != driver_type)
+			return -1;
+		return target_type;
+	}
+	return driver_type;
 }
 
 static void iommu_group_do_probe_finalize(struct device *dev)
···
 }
 EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
 
-static struct iommu_domain *__iommu_domain_alloc(const struct bus_type *bus,
-						 unsigned type)
+static struct iommu_domain *__iommu_domain_alloc(const struct iommu_ops *ops,
+						 struct device *dev,
+						 unsigned int type)
 {
 	struct iommu_domain *domain;
 	unsigned int alloc_type = type & IOMMU_DOMAIN_ALLOC_FLAGS;
 
-	if (bus == NULL || bus->iommu_ops == NULL)
+	if (alloc_type == IOMMU_DOMAIN_IDENTITY && ops->identity_domain)
+		return ops->identity_domain;
+	else if (alloc_type == IOMMU_DOMAIN_BLOCKED && ops->blocked_domain)
+		return ops->blocked_domain;
+	else if (type & __IOMMU_DOMAIN_PAGING && ops->domain_alloc_paging)
+		domain = ops->domain_alloc_paging(dev);
+	else if (ops->domain_alloc)
+		domain = ops->domain_alloc(alloc_type);
+	else
 		return NULL;
 
-	domain = bus->iommu_ops->domain_alloc(alloc_type);
 	if (!domain)
 		return NULL;
 
···
 	 * may override this later
 	 */
 	if (!domain->pgsize_bitmap)
-		domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap;
+		domain->pgsize_bitmap = ops->pgsize_bitmap;
 
 	if (!domain->ops)
-		domain->ops = bus->iommu_ops->default_domain_ops;
+		domain->ops = ops->default_domain_ops;
 
 	if (iommu_is_dma_domain(domain) && iommu_get_dma_cookie(domain)) {
 		iommu_domain_free(domain);
···
 	return domain;
 }
 
+static struct iommu_domain *
+__iommu_group_domain_alloc(struct iommu_group *group, unsigned int type)
+{
+	struct device *dev =
+		list_first_entry(&group->devices, struct group_device, list)
+			->dev;
+
+	return __iommu_domain_alloc(group_iommu_ops(group), dev, type);
+}
+
 struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
 {
-	return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED);
+	if (bus == NULL || bus->iommu_ops == NULL)
+		return NULL;
+	return __iommu_domain_alloc(bus->iommu_ops, NULL,
+				    IOMMU_DOMAIN_UNMANAGED);
 }
 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
 
···
 	if (domain->type == IOMMU_DOMAIN_SVA)
 		mmdrop(domain->mm);
 	iommu_put_dma_cookie(domain);
-	domain->ops->free(domain);
+	if (domain->ops->free)
+		domain->ops->free(domain);
 }
 EXPORT_SYMBOL_GPL(iommu_domain_free);
 
···
  */
 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
 {
-	struct iommu_group *group;
+	/* Caller must be a probed driver on dev */
+	struct iommu_group *group = dev->iommu_group;
 	int ret;
 
-	group = iommu_group_get(dev);
 	if (!group)
 		return -ENODEV;
 
···
 
 out_unlock:
 	mutex_unlock(&group->mutex);
-	iommu_group_put(group);
-
 	return ret;
 }
 EXPORT_SYMBOL_GPL(iommu_attach_device);
···
 
 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
 {
-	struct iommu_group *group;
+	/* Caller must be a probed driver on dev */
+	struct iommu_group *group = dev->iommu_group;
 
-	group = iommu_group_get(dev);
 	if (!group)
 		return;
 
···
 
 out_unlock:
 	mutex_unlock(&group->mutex);
-	iommu_group_put(group);
 }
 EXPORT_SYMBOL_GPL(iommu_detach_device);
 
 struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 {
-	struct iommu_domain *domain;
-	struct iommu_group *group;
+	/* Caller must be a probed driver on dev */
+	struct iommu_group *group = dev->iommu_group;
 
-	group = iommu_group_get(dev);
 	if (!group)
 		return NULL;
 
-	domain = group->domain;
-
-	iommu_group_put(group);
-
-	return domain;
+	return group->domain;
 }
 EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev);
 
···
 	if (group->domain == new_domain)
 		return 0;
 
-	/*
-	 * New drivers should support default domains, so set_platform_dma()
-	 * op will never be called. Otherwise the NULL domain represents some
-	 * platform specific behavior.
-	 */
-	if (!new_domain) {
-		for_each_group_device(group, gdev) {
-			const struct iommu_ops *ops = dev_iommu_ops(gdev->dev);
-
-			if (!WARN_ON(!ops->set_platform_dma_ops))
-				ops->set_platform_dma_ops(gdev->dev);
-		}
-		group->domain = NULL;
-		return 0;
-	}
+	if (WARN_ON(!new_domain))
+		return -EINVAL;
 
 	/*
 	 * Changing the domain is done by calling attach_dev() on the new
···
 	 */
 	last_gdev = gdev;
 	for_each_group_device(group, gdev) {
-		const struct iommu_ops *ops = dev_iommu_ops(gdev->dev);
-
 		/*
-		 * If set_platform_dma_ops is not present a NULL domain can
-		 * happen only for first probe, in which case we leave
-		 * group->domain as NULL and let release clean everything up.
+		 * A NULL domain can happen only for first probe, in which case
+		 * we leave group->domain as NULL and let release clean
+		 * everything up.
 		 */
 		if (group->domain)
 			WARN_ON(__iommu_device_set_domain(
 				group, gdev->dev, group->domain,
 				IOMMU_SET_DOMAIN_MUST_SUCCEED));
-		else if (ops->set_platform_dma_ops)
-			ops->set_platform_dma_ops(gdev->dev);
 		if (gdev == last_gdev)
 			break;
 	}
···
 	return pgsize;
 }
 
-static int __iommu_map_pages(struct iommu_domain *domain, unsigned long iova,
-			     phys_addr_t paddr, size_t size, int prot,
-			     gfp_t gfp, size_t *mapped)
-{
-	const struct iommu_domain_ops *ops = domain->ops;
-	size_t pgsize, count;
-	int ret;
-
-	pgsize = iommu_pgsize(domain, iova, paddr, size, &count);
-
-	pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx count %zu\n",
-		 iova, &paddr, pgsize, count);
-
-	if (ops->map_pages) {
-		ret = ops->map_pages(domain, iova, paddr, pgsize, count, prot,
-				     gfp, mapped);
-	} else {
-		ret = ops->map(domain, iova, paddr, pgsize, prot, gfp);
-		*mapped = ret ? 0 : pgsize;
-	}
-
-	return ret;
-}
-
 static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
 		       phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
 {
···
 	phys_addr_t orig_paddr = paddr;
 	int ret = 0;
 
-	if (unlikely(!(ops->map || ops->map_pages) ||
-		     domain->pgsize_bitmap == 0UL))
-		return -ENODEV;
-
 	if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
 		return -EINVAL;
+
+	if (WARN_ON(!ops->map_pages || domain->pgsize_bitmap == 0UL))
+		return -ENODEV;
 
 	/* find out the minimum page size supported */
 	min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
···
 	pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size);
 
 	while (size) {
-		size_t mapped = 0;
+		size_t pgsize, count, mapped = 0;
 
-		ret = __iommu_map_pages(domain, iova, paddr, size, prot, gfp,
-					&mapped);
+		pgsize = iommu_pgsize(domain, iova, paddr, size, &count);
+
+		pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx count %zu\n",
+			 iova, &paddr, pgsize, count);
+		ret = ops->map_pages(domain, iova, paddr, pgsize, count, prot,
+				     gfp, &mapped);
 		/*
 		 * Some pages may have been mapped, even if an error occurred,
 		 * so we should account for those so they can be unmapped.
···
 		return -EINVAL;
 
 	ret = __iommu_map(domain, iova, paddr, size, prot, gfp);
-	if (ret == 0 && ops->iotlb_sync_map)
-		ops->iotlb_sync_map(domain, iova, size);
+	if (ret == 0 && ops->iotlb_sync_map) {
+		ret = ops->iotlb_sync_map(domain, iova, size);
+		if (ret)
+			goto out_err;
+	}
+
+	return ret;
+
+out_err:
+	/* undo mappings already done */
+	iommu_unmap(domain, iova, size);
 
 	return ret;
 }
 EXPORT_SYMBOL_GPL(iommu_map);
-
-static size_t __iommu_unmap_pages(struct iommu_domain *domain,
-				  unsigned long iova, size_t size,
-				  struct iommu_iotlb_gather *iotlb_gather)
-{
-	const struct iommu_domain_ops *ops = domain->ops;
-	size_t pgsize, count;
-
-	pgsize = iommu_pgsize(domain, iova, iova, size, &count);
-	return ops->unmap_pages ?
-	       ops->unmap_pages(domain, iova, pgsize, count, iotlb_gather) :
-	       ops->unmap(domain, iova, pgsize, iotlb_gather);
-}
 
 static size_t __iommu_unmap(struct iommu_domain *domain,
 			    unsigned long iova, size_t size,
···
 	unsigned long orig_iova = iova;
 	unsigned int min_pagesz;
 
-	if (unlikely(!(ops->unmap || ops->unmap_pages) ||
-		     domain->pgsize_bitmap == 0UL))
+	if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
 		return 0;
 
-	if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
+	if (WARN_ON(!ops->unmap_pages || domain->pgsize_bitmap == 0UL))
 		return 0;
 
 	/* find out the minimum page size supported */
···
 	 * or we hit an area that isn't mapped.
 	 */
 	while (unmapped < size) {
-		unmapped_page = __iommu_unmap_pages(domain, iova,
-						    size - unmapped,
-						    iotlb_gather);
+		size_t pgsize, count;
+
+		pgsize = iommu_pgsize(domain, iova, iova, size - unmapped, &count);
+		unmapped_page = ops->unmap_pages(domain, iova, pgsize, count, iotlb_gather);
 		if (!unmapped_page)
 			break;
 
···
 			sg = sg_next(sg);
 	}
 
-	if (ops->iotlb_sync_map)
-		ops->iotlb_sync_map(domain, iova, mapped);
+	if (ops->iotlb_sync_map) {
+		ret = ops->iotlb_sync_map(domain, iova, mapped);
+		if (ret)
+			goto out_err;
+	}
 	return mapped;
 
 out_err:
···
 	if (req_type < 0)
 		return -EINVAL;
 
-	/*
-	 * There are still some drivers which don't support default domains, so
-	 * we ignore the failure and leave group->default_domain NULL.
-	 *
-	 * We assume that the iommu driver starts up the device in
-	 * 'set_platform_dma_ops' mode if it does not support default domains.
-	 */
 	dom = iommu_group_alloc_default_domain(group, req_type);
-	if (!dom) {
-		/* Once in default_domain mode we never leave */
-		if (group->default_domain)
-			return -ENODEV;
-		group->default_domain = NULL;
-		return 0;
-	}
+	if (!dom)
+		return -ENODEV;
 
 	if (group->default_domain == dom)
 		return 0;
···
 	return ret ?: count;
 }
 
-static bool iommu_is_default_domain(struct iommu_group *group)
-{
-	if (group->domain == group->default_domain)
-		return true;
-
-	/*
-	 * If the default domain was set to identity and it is still an identity
-	 * domain then we consider this a pass. This happens because of
-	 * amd_iommu_init_device() replacing the default idenytity domain with an
-	 * identity domain that has a different configuration for AMDGPU.
-	 */
-	if (group->default_domain &&
-	    group->default_domain->type == IOMMU_DOMAIN_IDENTITY &&
-	    group->domain && group->domain->type == IOMMU_DOMAIN_IDENTITY)
-		return true;
-	return false;
-}
-
 /**
  * iommu_device_use_default_domain() - Device driver wants to handle device
  *                                     DMA through the kernel DMA API.
···
  */
 int iommu_device_use_default_domain(struct device *dev)
 {
-	struct iommu_group *group = iommu_group_get(dev);
+	/* Caller is the driver core during the pre-probe path */
+	struct iommu_group *group = dev->iommu_group;
 	int ret = 0;
 
 	if (!group)
···
 
 	mutex_lock(&group->mutex);
 	if (group->owner_cnt) {
-		if (group->owner || !iommu_is_default_domain(group) ||
+		if (group->domain != group->default_domain || group->owner ||
 		    !xa_empty(&group->pasid_array)) {
 			ret = -EBUSY;
 			goto unlock_out;
···
 
 unlock_out:
 	mutex_unlock(&group->mutex);
-	iommu_group_put(group);
-
 	return ret;
 }
 
···
  */
 void iommu_device_unuse_default_domain(struct device *dev)
 {
-	struct iommu_group *group = iommu_group_get(dev);
+	/* Caller is the driver core during the post-probe path */
+	struct iommu_group *group = dev->iommu_group;
 
 	if (!group)
 		return;
···
 		group->owner_cnt--;
 
 	mutex_unlock(&group->mutex);
-	iommu_group_put(group);
 }
 
 static int __iommu_group_alloc_blocking_domain(struct iommu_group *group)
 {
-	struct group_device *dev =
-		list_first_entry(&group->devices, struct group_device, list);
-
 	if (group->blocking_domain)
 		return 0;
 
 	group->blocking_domain =
-		__iommu_domain_alloc(dev->dev->bus, IOMMU_DOMAIN_BLOCKED);
+		__iommu_group_domain_alloc(group, IOMMU_DOMAIN_BLOCKED);
 	if (!group->blocking_domain) {
 		/*
 		 * For drivers that do not yet understand IOMMU_DOMAIN_BLOCKED
 		 * create an empty domain instead.
 		 */
-		group->blocking_domain = __iommu_domain_alloc(
-			dev->dev->bus, IOMMU_DOMAIN_UNMANAGED);
+		group->blocking_domain = __iommu_group_domain_alloc(
+			group, IOMMU_DOMAIN_UNMANAGED);
 		if (!group->blocking_domain)
 			return -EINVAL;
 	}
···
  */
 int iommu_device_claim_dma_owner(struct device *dev, void *owner)
 {
-	struct iommu_group *group;
+	/* Caller must be a probed driver on dev */
+	struct iommu_group *group = dev->iommu_group;
 	int ret = 0;
 
 	if (WARN_ON(!owner))
 		return -EINVAL;
 
-	group = iommu_group_get(dev);
 	if (!group)
 		return -ENODEV;
 
···
 	ret = __iommu_take_dma_ownership(group, owner);
 unlock_out:
 	mutex_unlock(&group->mutex);
-	iommu_group_put(group);
-
 	return ret;
 }
 EXPORT_SYMBOL_GPL(iommu_device_claim_dma_owner);
···
  */
 void iommu_device_release_dma_owner(struct device *dev)
 {
-	struct iommu_group *group = iommu_group_get(dev);
+	/* Caller must be a probed driver on dev */
+	struct iommu_group *group = dev->iommu_group;
 
 	mutex_lock(&group->mutex);
 	if (group->owner_cnt > 1)
···
 	else
 		__iommu_release_dma_ownership(group);
 	mutex_unlock(&group->mutex);
-	iommu_group_put(group);
 }
 EXPORT_SYMBOL_GPL(iommu_device_release_dma_owner);
 
···
 int iommu_attach_device_pasid(struct iommu_domain *domain,
 			      struct device *dev, ioasid_t pasid)
 {
-	struct iommu_group *group;
+	/* Caller must be a probed driver on dev */
+	struct iommu_group *group = dev->iommu_group;
 	void *curr;
 	int ret;
 
 	if (!domain->ops->set_dev_pasid)
 		return -EOPNOTSUPP;
 
-	group = iommu_group_get(dev);
 	if (!group)
 		return -ENODEV;
 
···
 	}
 out_unlock:
 	mutex_unlock(&group->mutex);
-	iommu_group_put(group);
-
 	return ret;
 }
 EXPORT_SYMBOL_GPL(iommu_attach_device_pasid);
···
 void iommu_detach_device_pasid(struct iommu_domain *domain, struct device *dev,
 			       ioasid_t pasid)
 {
-	struct iommu_group *group = iommu_group_get(dev);
+	/* Caller must be a probed driver on dev */
+	struct iommu_group *group = dev->iommu_group;
 
 	mutex_lock(&group->mutex);
 	__iommu_remove_group_pasid(group, pasid);
 	WARN_ON(xa_erase(&group->pasid_array, pasid) != domain);
 	mutex_unlock(&group->mutex);
-
-	iommu_group_put(group);
 }
 EXPORT_SYMBOL_GPL(iommu_detach_device_pasid);
 
···
 						    ioasid_t pasid,
 						    unsigned int type)
 {
+	/* Caller must be a probed driver on dev */
+	struct iommu_group *group = dev->iommu_group;
 	struct iommu_domain *domain;
-	struct iommu_group *group;
 
-	group = iommu_group_get(dev);
 	if (!group)
 		return NULL;
 
···
 	if (type && domain && domain->type != type)
 		domain = ERR_PTR(-EBUSY);
 	xa_unlock(&group->pasid_array);
-	iommu_group_put(group);
 
 	return domain;
 }

drivers/iommu/iommufd/selftest.c

···
 	};
 };
 
-static void mock_domain_blocking_free(struct iommu_domain *domain)
-{
-}
-
 static int mock_domain_nop_attach(struct iommu_domain *domain,
 				  struct device *dev)
 {
···
 }
 
 static const struct iommu_domain_ops mock_blocking_ops = {
-	.free = mock_domain_blocking_free,
 	.attach_dev = mock_domain_nop_attach,
 };
 
···
 	return info;
 }
 
-static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type)
+static struct iommu_domain *mock_domain_alloc_paging(struct device *dev)
 {
 	struct mock_iommu_domain *mock;
-
-	if (iommu_domain_type == IOMMU_DOMAIN_BLOCKED)
-		return &mock_blocking_domain;
-
-	if (iommu_domain_type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	mock = kzalloc(sizeof(*mock), GFP_KERNEL);
 	if (!mock)
···
 	return cap == IOMMU_CAP_CACHE_COHERENCY;
 }
 
-static void mock_domain_set_plaform_dma_ops(struct device *dev)
-{
-	/*
-	 * mock doesn't setup default domains because we can't hook into the
-	 * normal probe path
-	 */
-}
-
 static struct iommu_device mock_iommu_device = {
 };
 
···
 }
 
 static const struct iommu_ops mock_ops = {
+	/*
+	 * IOMMU_DOMAIN_BLOCKED cannot be returned from def_domain_type()
+	 * because it is zero.
+	 */
+	.default_domain = &mock_blocking_domain,
+	.blocked_domain = &mock_blocking_domain,
 	.owner = THIS_MODULE,
 	.pgsize_bitmap = MOCK_IO_PAGE_SIZE,
 	.hw_info = mock_domain_hw_info,
-	.domain_alloc = mock_domain_alloc,
+	.domain_alloc_paging = mock_domain_alloc_paging,
 	.capable = mock_domain_capable,
-	.set_platform_dma_ops = mock_domain_set_plaform_dma_ops,
 	.device_group = generic_device_group,
 	.probe_device = mock_probe_device,
 	.default_domain_ops =

drivers/iommu/iova.c

···
 #include <linux/smp.h>
 #include <linux/bitops.h>
 #include <linux/cpu.h>
+#include <linux/workqueue.h>
 
 /* The anchor node sits above the top of the usable address space */
 #define IOVA_ANCHOR	~0UL
···
 /*
  * As kmalloc's buffer size is fixed to power of 2, 127 is chosen to
  * assure size of 'iova_magazine' to be 1024 bytes, so that no memory
- * will be wasted.
+ * will be wasted. Since only full magazines are inserted into the depot,
+ * we don't need to waste PFN capacity on a separate list head either.
  */
 #define IOVA_MAG_SIZE 127
-#define MAX_GLOBAL_MAGS 32	/* magazines per bin */
+
+#define IOVA_DEPOT_DELAY msecs_to_jiffies(100)
 
 struct iova_magazine {
-	unsigned long size;
+	union {
+		unsigned long size;
+		struct iova_magazine *next;
+	};
 	unsigned long pfns[IOVA_MAG_SIZE];
 };
+static_assert(!(sizeof(struct iova_magazine) & (sizeof(struct iova_magazine) - 1)));
 
 struct iova_cpu_rcache {
 	spinlock_t lock;
···
 
 struct iova_rcache {
 	spinlock_t lock;
-	unsigned long depot_size;
-	struct iova_magazine *depot[MAX_GLOBAL_MAGS];
+	unsigned int depot_size;
+	struct iova_magazine *depot;
 	struct iova_cpu_rcache __percpu *cpu_rcaches;
+	struct iova_domain *iovad;
+	struct delayed_work work;
 };
 
 static struct iova_magazine *iova_magazine_alloc(gfp_t flags)
···
 	mag->pfns[mag->size++] = pfn;
 }
 
+static struct iova_magazine *iova_depot_pop(struct iova_rcache *rcache)
+{
+	struct iova_magazine *mag = rcache->depot;
+
+	rcache->depot = mag->next;
+	mag->size = IOVA_MAG_SIZE;
+	rcache->depot_size--;
+	return mag;
+}
+
+static void iova_depot_push(struct iova_rcache *rcache, struct iova_magazine *mag)
+{
+	mag->next = rcache->depot;
+	rcache->depot = mag;
+	rcache->depot_size++;
+}
+
+static void iova_depot_work_func(struct work_struct *work)
+{
+	struct iova_rcache *rcache = container_of(work, typeof(*rcache), work.work);
+	struct iova_magazine *mag = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&rcache->lock, flags);
+	if (rcache->depot_size > num_online_cpus())
+		mag = iova_depot_pop(rcache);
+	spin_unlock_irqrestore(&rcache->lock, flags);
+
+	if (mag) {
+		iova_magazine_free_pfns(mag, rcache->iovad);
+		iova_magazine_free(mag);
+		schedule_delayed_work(&rcache->work, IOVA_DEPOT_DELAY);
+	}
+}
+
 int iova_domain_init_rcaches(struct iova_domain *iovad)
 {
 	unsigned int cpu;
···
 
 		rcache = &iovad->rcaches[i];
 		spin_lock_init(&rcache->lock);
-		rcache->depot_size = 0;
+		rcache->iovad = iovad;
+		INIT_DELAYED_WORK(&rcache->work, iova_depot_work_func);
 		rcache->cpu_rcaches = __alloc_percpu(sizeof(*cpu_rcache),
 						     cache_line_size());
 		if (!rcache->cpu_rcaches) {
···
 				 struct iova_rcache *rcache,
 				 unsigned long iova_pfn)
 {
-	struct iova_magazine *mag_to_free = NULL;
 	struct iova_cpu_rcache *cpu_rcache;
 	bool can_insert = false;
 	unsigned long flags;
···
 
 		if (new_mag) {
 			spin_lock(&rcache->lock);
-			if (rcache->depot_size < MAX_GLOBAL_MAGS) {
-				rcache->depot[rcache->depot_size++] =
-						cpu_rcache->loaded;
-			} else {
-				mag_to_free = cpu_rcache->loaded;
-			}
+			iova_depot_push(rcache, cpu_rcache->loaded);
 			spin_unlock(&rcache->lock);
+			schedule_delayed_work(&rcache->work, IOVA_DEPOT_DELAY);
 
 			cpu_rcache->loaded = new_mag;
 			can_insert = true;
···
 		iova_magazine_push(cpu_rcache->loaded, iova_pfn);
 
 	spin_unlock_irqrestore(&cpu_rcache->lock, flags);
-
-	if (mag_to_free) {
-		iova_magazine_free_pfns(mag_to_free, iovad);
-		iova_magazine_free(mag_to_free);
-	}
 
 	return can_insert;
 }
···
 		has_pfn = true;
 	} else {
 		spin_lock(&rcache->lock);
-		if (rcache->depot_size > 0) {
+		if (rcache->depot) {
 			iova_magazine_free(cpu_rcache->loaded);
-			cpu_rcache->loaded = rcache->depot[--rcache->depot_size];
+			cpu_rcache->loaded = iova_depot_pop(rcache);
 			has_pfn = true;
 		}
 		spin_unlock(&rcache->lock);
···
 	struct iova_rcache *rcache;
 	struct iova_cpu_rcache *cpu_rcache;
 	unsigned int cpu;
-	int i, j;
 
-	for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
+	for (int i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
 		rcache = &iovad->rcaches[i];
 		if (!rcache->cpu_rcaches)
 			break;
···
 			iova_magazine_free(cpu_rcache->prev);
 		}
 		free_percpu(rcache->cpu_rcaches);
-		for (j = 0; j < rcache->depot_size; ++j)
-			iova_magazine_free(rcache->depot[j]);
+		cancel_delayed_work_sync(&rcache->work);
+		while (rcache->depot)
+			iova_magazine_free(iova_depot_pop(rcache));
 	}
 
 	kfree(iovad->rcaches);
···
 {
 	struct iova_rcache *rcache;
 	unsigned long flags;
-	int i, j;
 
-	for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
+	for (int i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
 		rcache = &iovad->rcaches[i];
 		spin_lock_irqsave(&rcache->lock, flags);
-		for (j = 0; j < rcache->depot_size; ++j) {
-			iova_magazine_free_pfns(rcache->depot[j], iovad);
-			iova_magazine_free(rcache->depot[j]);
+		while (rcache->depot) {
+			struct iova_magazine *mag = iova_depot_pop(rcache);
+
+			iova_magazine_free_pfns(mag, iovad);
+			iova_magazine_free(mag);
 		}
-		rcache->depot_size = 0;
 		spin_unlock_irqrestore(&rcache->lock, flags);
 	}
 }

drivers/iommu/ipmmu-vmsa.c

···
 	struct ipmmu_vmsa_domain *domains[IPMMU_CTX_MAX];
 	s8 utlb_ctx[IPMMU_UTLB_MAX];
 
-	struct iommu_group *group;
 	struct dma_iommu_mapping *mapping;
 };
 
···
 	ipmmu_imuctr_write(mmu, utlb, IMUCTR_TTSEL_MMU(domain->context_id) |
 				      IMUCTR_FLUSH | IMUCTR_MMUEN);
 	mmu->utlb_ctx[utlb] = domain->context_id;
+}
+
+/*
+ * Disable MMU translation for the microTLB.
+ */
+static void ipmmu_utlb_disable(struct ipmmu_vmsa_domain *domain,
+			       unsigned int utlb)
+{
+	struct ipmmu_vmsa_device *mmu = domain->mmu;
+
+	ipmmu_imuctr_write(mmu, utlb, 0);
+	mmu->utlb_ctx[utlb] = IPMMU_CTX_INVALID;
 }
 
 static void ipmmu_tlb_flush_all(void *cookie)
···
  * IOMMU Operations
  */
 
-static struct iommu_domain *ipmmu_domain_alloc(unsigned type)
+static struct iommu_domain *ipmmu_domain_alloc_paging(struct device *dev)
 {
 	struct ipmmu_vmsa_domain *domain;
-
-	if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
-		return NULL;
 
 	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
 	if (!domain)
···
 
 	return 0;
 }
+
+static int ipmmu_iommu_identity_attach(struct iommu_domain *identity_domain,
+				       struct device *dev)
+{
+	struct iommu_domain *io_domain = iommu_get_domain_for_dev(dev);
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+	struct ipmmu_vmsa_domain *domain;
+	unsigned int i;
+
+	if (io_domain == identity_domain || !io_domain)
+		return 0;
+
+	domain = to_vmsa_domain(io_domain);
+	for (i = 0; i < fwspec->num_ids; ++i)
+		ipmmu_utlb_disable(domain, fwspec->ids[i]);
+
+	/*
+	 * TODO: Optimize by disabling the context when no device is attached.
+	 */
+	return 0;
+}
+
+static struct iommu_domain_ops ipmmu_iommu_identity_ops = {
+	.attach_dev = ipmmu_iommu_identity_attach,
+};
+
+static struct iommu_domain ipmmu_iommu_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &ipmmu_iommu_identity_ops,
+};
 
 static int ipmmu_map(struct iommu_domain *io_domain, unsigned long iova,
 		     phys_addr_t paddr, size_t pgsize, size_t pgcount,
···
 	arm_iommu_release_mapping(mmu->mapping);
 }
 
-static struct iommu_group *ipmmu_find_group(struct device *dev)
-{
-	struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
-	struct iommu_group *group;
-
-	if (mmu->group)
-		return iommu_group_ref_get(mmu->group);
-
-	group = iommu_group_alloc();
-	if (!IS_ERR(group))
-		mmu->group = group;
-
-	return group;
-}
-
 static const struct iommu_ops ipmmu_ops = {
-	.domain_alloc = ipmmu_domain_alloc,
+	.identity_domain = &ipmmu_iommu_identity_domain,
+	.domain_alloc_paging = ipmmu_domain_alloc_paging,
 	.probe_device = ipmmu_probe_device,
 	.release_device = ipmmu_release_device,
 	.probe_finalize = ipmmu_probe_finalize,
+	/*
+	 * FIXME: The device grouping is a fixed property of the hardware's
+	 * ability to isolate and control DMA, it should not depend on kconfig.
+	 */
 	.device_group = IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA)
-			? generic_device_group : ipmmu_find_group,
+			? generic_device_group : generic_single_device_group,
 	.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
 	.of_xlate = ipmmu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {

drivers/iommu/msm_iommu.c

···
 	SET_M(base, ctx, 1);
 }
 
-static struct iommu_domain *msm_iommu_domain_alloc(unsigned type)
+static struct iommu_domain *msm_iommu_domain_alloc_paging(struct device *dev)
 {
 	struct msm_priv *priv;
-
-	if (type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
···
 	return ret;
 }
 
-static void msm_iommu_set_platform_dma(struct device *dev)
+static int msm_iommu_identity_attach(struct iommu_domain *identity_domain,
+				     struct device *dev)
 {
 	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
-	struct msm_priv *priv = to_msm_priv(domain);
+	struct msm_priv *priv;
 	unsigned long flags;
 	struct msm_iommu_dev *iommu;
 	struct msm_iommu_ctx_dev *master;
-	int ret;
+	int ret = 0;
 
+	if (domain == identity_domain || !domain)
+		return 0;
+
+	priv = to_msm_priv(domain);
 	free_io_pgtable_ops(priv->iop);
 
 	spin_lock_irqsave(&msm_iommu_lock, flags);
···
 	}
 fail:
 	spin_unlock_irqrestore(&msm_iommu_lock, flags);
+	return ret;
 }
+
+static struct iommu_domain_ops msm_iommu_identity_ops = {
+	.attach_dev = msm_iommu_identity_attach,
+};
+
+static struct iommu_domain msm_iommu_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &msm_iommu_identity_ops,
+};
 
 static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova,
 			 phys_addr_t pa, size_t pgsize, size_t pgcount,
···
 	return ret;
 }
 
-static void msm_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
-			       size_t size)
+static int msm_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+			      size_t size)
 {
 	struct msm_priv *priv = to_msm_priv(domain);
 
 	__flush_iotlb_range(iova, size, SZ_4K, false, priv);
+	return 0;
 }
 
 static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
···
 }
 
 static struct iommu_ops msm_iommu_ops = {
-	.domain_alloc = msm_iommu_domain_alloc,
+	.identity_domain = &msm_iommu_identity_domain,
+	.domain_alloc_paging = msm_iommu_domain_alloc_paging,
 	.probe_device = msm_iommu_probe_device,
 	.device_group = generic_device_group,
-	.set_platform_dma_ops = msm_iommu_set_platform_dma,
 	.pgsize_bitmap = MSM_IOMMU_PGSIZES,
 	.of_xlate = qcom_iommu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {

drivers/iommu/mtk_iommu.c

···
 	return 0;
 }
 
-static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
+static struct iommu_domain *mtk_iommu_domain_alloc_paging(struct device *dev)
 {
 	struct mtk_iommu_domain *dom;
-
-	if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	dom = kzalloc(sizeof(*dom), GFP_KERNEL);
 	if (!dom)
···
 	return ret;
 }
 
+static int mtk_iommu_identity_attach(struct iommu_domain *identity_domain,
+				     struct device *dev)
+{
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+	struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
+
+	if (domain == identity_domain || !domain)
+		return 0;
+
+	mtk_iommu_config(data, dev, false, 0);
+	return 0;
+}
+
+static struct iommu_domain_ops mtk_iommu_identity_ops = {
+	.attach_dev = mtk_iommu_identity_attach,
+};
+
+static struct iommu_domain mtk_iommu_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &mtk_iommu_identity_ops,
+};
+
 static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
 			 phys_addr_t paddr, size_t pgsize, size_t pgcount,
 			 int prot, gfp_t gfp, size_t *mapped)
···
 	mtk_iommu_tlb_flush_range_sync(gather->start, length, dom->bank);
 }
 
-static void mtk_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
-			       size_t size)
+static int mtk_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+			      size_t size)
 {
 	struct mtk_iommu_domain *dom = to_mtk_domain(domain);
 
 	mtk_iommu_tlb_flush_range_sync(iova, size, dom->bank);
+	return 0;
 }
 
 static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
···
 }
 
 static const struct iommu_ops mtk_iommu_ops = {
-	.domain_alloc	= mtk_iommu_domain_alloc,
+	.identity_domain = &mtk_iommu_identity_domain,
+	.domain_alloc_paging = mtk_iommu_domain_alloc_paging,
 	.probe_device	= mtk_iommu_probe_device,
 	.release_device	= mtk_iommu_release_device,
 	.device_group	= mtk_iommu_device_group,

drivers/iommu/mtk_iommu_v1.c

···
 	return 0;
 }
 
-static struct iommu_domain *mtk_iommu_v1_domain_alloc(unsigned type)
+static struct iommu_domain *mtk_iommu_v1_domain_alloc_paging(struct device *dev)
 {
 	struct mtk_iommu_v1_domain *dom;
-
-	if (type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	dom = kzalloc(sizeof(*dom), GFP_KERNEL);
 	if (!dom)
···
 	return 0;
 }
 
-static void mtk_iommu_v1_set_platform_dma(struct device *dev)
+static int mtk_iommu_v1_identity_attach(struct iommu_domain *identity_domain,
+					struct device *dev)
 {
 	struct mtk_iommu_v1_data *data = dev_iommu_priv_get(dev);
 
 	mtk_iommu_v1_config(data, dev, false);
+	return 0;
 }
+
+static struct iommu_domain_ops mtk_iommu_v1_identity_ops = {
+	.attach_dev = mtk_iommu_v1_identity_attach,
+};
+
+static struct iommu_domain mtk_iommu_v1_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &mtk_iommu_v1_identity_ops,
+};
 
 static int mtk_iommu_v1_map(struct iommu_domain *domain, unsigned long iova,
 			    phys_addr_t paddr, size_t pgsize, size_t pgcount,
···
 	}
 
 	return 0;
-}
-
-static int mtk_iommu_v1_def_domain_type(struct device *dev)
-{
-	return IOMMU_DOMAIN_UNMANAGED;
 }
 
 static struct iommu_device *mtk_iommu_v1_probe_device(struct device *dev)
···
 }
 
 static const struct iommu_ops mtk_iommu_v1_ops = {
-	.domain_alloc	= mtk_iommu_v1_domain_alloc,
+	.identity_domain = &mtk_iommu_v1_identity_domain,
+	.domain_alloc_paging = mtk_iommu_v1_domain_alloc_paging,
 	.probe_device	= mtk_iommu_v1_probe_device,
 	.probe_finalize = mtk_iommu_v1_probe_finalize,
 	.release_device	= mtk_iommu_v1_release_device,
-	.def_domain_type = mtk_iommu_v1_def_domain_type,
 	.device_group	= generic_device_group,
 	.pgsize_bitmap	= MT2701_IOMMU_PAGE_SIZE,
-	.set_platform_dma_ops = mtk_iommu_v1_set_platform_dma,
 	.owner          = THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= mtk_iommu_v1_attach_device,

drivers/iommu/omap-iommu.c

···
 	platform_set_drvdata(pdev, obj);
 
 	if (omap_iommu_can_register(pdev)) {
-		obj->group = iommu_group_alloc();
-		if (IS_ERR(obj->group))
-			return PTR_ERR(obj->group);
-
 		err = iommu_device_sysfs_add(&obj->iommu, obj->dev, NULL,
 					     obj->name);
 		if (err)
-			goto out_group;
+			return err;
 
 		err = iommu_device_register(&obj->iommu, &omap_iommu_ops, &pdev->dev);
 		if (err)
 			goto out_sysfs;
+		obj->has_iommu_driver = true;
 	}
 
 	pm_runtime_enable(obj->dev);
···
 
 out_sysfs:
 	iommu_device_sysfs_remove(&obj->iommu);
-out_group:
-	iommu_group_put(obj->group);
 	return err;
 }
 
···
 {
 	struct omap_iommu *obj = platform_get_drvdata(pdev);
 
-	if (obj->group) {
-		iommu_group_put(obj->group);
-		obj->group = NULL;
-
+	if (obj->has_iommu_driver) {
 		iommu_device_sysfs_remove(&obj->iommu);
 		iommu_device_unregister(&obj->iommu);
 	}
···
 }
 
 static int omap_iommu_map(struct iommu_domain *domain, unsigned long da,
-			  phys_addr_t pa, size_t bytes, int prot, gfp_t gfp)
+			  phys_addr_t pa, size_t bytes, size_t count,
+			  int prot, gfp_t gfp, size_t *mapped)
 {
 	struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
 	struct device *dev = omap_domain->dev;
···
 			oiommu = iommu->iommu_dev;
 			iopgtable_clear_entry(oiommu, da);
 		}
+	} else {
+		*mapped = bytes;
 	}
 
 	return ret;
 }
 
 static size_t omap_iommu_unmap(struct iommu_domain *domain, unsigned long da,
-			       size_t size, struct iommu_iotlb_gather *gather)
+			       size_t size, size_t count, struct iommu_iotlb_gather *gather)
 {
 	struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
 	struct device *dev = omap_domain->dev;
···
 	omap_domain->dev = NULL;
 }
 
-static void omap_iommu_set_platform_dma(struct device *dev)
+static int omap_iommu_identity_attach(struct iommu_domain *identity_domain,
+				      struct device *dev)
 {
 	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
-	struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
+	struct omap_iommu_domain *omap_domain;
 
+	if (domain == identity_domain || !domain)
+		return 0;
+
+	omap_domain = to_omap_domain(domain);
 	spin_lock(&omap_domain->lock);
 	_omap_iommu_detach_dev(omap_domain, dev);
 	spin_unlock(&omap_domain->lock);
+	return 0;
 }
 
-static struct iommu_domain *omap_iommu_domain_alloc(unsigned type)
+static struct iommu_domain_ops omap_iommu_identity_ops = {
+	.attach_dev = omap_iommu_identity_attach,
+};
+
+static struct iommu_domain omap_iommu_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &omap_iommu_identity_ops,
+};
+
+static struct iommu_domain *omap_iommu_domain_alloc_paging(struct device *dev)
 {
 	struct omap_iommu_domain *omap_domain;
-
-	if (type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	omap_domain = kzalloc(sizeof(*omap_domain), GFP_KERNEL);
 	if (!omap_domain)
···
 
 }
 
-static struct iommu_group *omap_iommu_device_group(struct device *dev)
-{
-	struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev);
-	struct iommu_group *group = ERR_PTR(-EINVAL);
-
-	if (!arch_data)
-		return ERR_PTR(-ENODEV);
-
-	if (arch_data->iommu_dev)
-		group = iommu_group_ref_get(arch_data->iommu_dev->group);
-
-	return group;
-}
-
 static const struct iommu_ops omap_iommu_ops = {
-	.domain_alloc	= omap_iommu_domain_alloc,
+	.identity_domain = &omap_iommu_identity_domain,
+	.domain_alloc_paging = omap_iommu_domain_alloc_paging,
 	.probe_device	= omap_iommu_probe_device,
 	.release_device	= omap_iommu_release_device,
-	.device_group	= omap_iommu_device_group,
-	.set_platform_dma_ops = omap_iommu_set_platform_dma,
+	.device_group	= generic_single_device_group,
 	.pgsize_bitmap	= OMAP_IOMMU_PGSIZES,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= omap_iommu_attach_dev,
-		.map		= omap_iommu_map,
-		.unmap		= omap_iommu_unmap,
+		.map_pages	= omap_iommu_map,
+		.unmap_pages	= omap_iommu_unmap,
 		.iova_to_phys	= omap_iommu_iova_to_phys,
 		.free		= omap_iommu_domain_free,
 	}

drivers/iommu/omap-iommu.h

···
 	u32 id;
 
 	struct iommu_device iommu;
-	struct iommu_group *group;
+	bool has_iommu_driver;
 
 	u8 pwrst;
 };

drivers/iommu/rockchip-iommu.c

···
 	struct iommu_device iommu;
 	struct list_head node; /* entry in rk_iommu_domain.iommus */
 	struct iommu_domain *domain; /* domain to which iommu is attached */
-	struct iommu_group *group;
 };
 
 struct rk_iommudata {
···
 }
 
 static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova,
-			phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+			phys_addr_t paddr, size_t size, size_t count,
+			int prot, gfp_t gfp, size_t *mapped)
 {
 	struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
 	unsigned long flags;
···
 				paddr, size, prot);
 
 	spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
+	if (!ret)
+		*mapped = size;
 
 	return ret;
 }
 
 static size_t rk_iommu_unmap(struct iommu_domain *domain, unsigned long _iova,
-			     size_t size, struct iommu_iotlb_gather *gather)
+			     size_t size, size_t count, struct iommu_iotlb_gather *gather)
 {
 	struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
 	unsigned long flags;
···
 	return 0;
 }
 
-static void rk_iommu_identity_free(struct iommu_domain *domain)
-{
-}
-
 static struct iommu_domain_ops rk_identity_ops = {
 	.attach_dev = rk_iommu_identity_attach,
-	.free = rk_iommu_identity_free,
 };
 
 static struct iommu_domain rk_identity_domain = {
 	.type = IOMMU_DOMAIN_IDENTITY,
 	.ops = &rk_identity_ops,
 };
-
-#ifdef CONFIG_ARM
-static void rk_iommu_set_platform_dma(struct device *dev)
-{
-	WARN_ON(rk_iommu_identity_attach(&rk_identity_domain, dev));
-}
-#endif
 
 static int rk_iommu_attach_device(struct iommu_domain *domain,
 		struct device *dev)
···
 	return ret;
 }
 
-static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
+static struct iommu_domain *rk_iommu_domain_alloc_paging(struct device *dev)
 {
 	struct rk_iommu_domain *rk_domain;
-
-	if (type == IOMMU_DOMAIN_IDENTITY)
-		return &rk_identity_domain;
-
-	if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
-		return NULL;
 
 	if (!dma_dev)
 		return NULL;
···
 	device_link_del(data->link);
 }
 
-static struct iommu_group *rk_iommu_device_group(struct device *dev)
-{
-	struct rk_iommu *iommu;
-
-	iommu = rk_iommu_from_dev(dev);
-
-	return iommu_group_ref_get(iommu->group);
-}
-
 static int rk_iommu_of_xlate(struct device *dev,
 			     struct of_phandle_args *args)
 {
···
 }
 
 static const struct iommu_ops rk_iommu_ops = {
-	.domain_alloc = rk_iommu_domain_alloc,
+	.identity_domain = &rk_identity_domain,
+	.domain_alloc_paging = rk_iommu_domain_alloc_paging,
 	.probe_device = rk_iommu_probe_device,
 	.release_device = rk_iommu_release_device,
-	.device_group = rk_iommu_device_group,
-#ifdef CONFIG_ARM
-	.set_platform_dma_ops = rk_iommu_set_platform_dma,
-#endif
+	.device_group = generic_single_device_group,
 	.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
 	.of_xlate = rk_iommu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= rk_iommu_attach_device,
-		.map		= rk_iommu_map,
-		.unmap		= rk_iommu_unmap,
+		.map_pages	= rk_iommu_map,
+		.unmap_pages	= rk_iommu_unmap,
 		.iova_to_phys	= rk_iommu_iova_to_phys,
 		.free		= rk_iommu_domain_free,
 	}
···
 	if (err)
 		return err;
 
-	iommu->group = iommu_group_alloc();
-	if (IS_ERR(iommu->group)) {
-		err = PTR_ERR(iommu->group);
-		goto err_unprepare_clocks;
-	}
-
 	err = iommu_device_sysfs_add(&iommu->iommu, dev, NULL, dev_name(dev));
 	if (err)
-		goto err_put_group;
+		goto err_unprepare_clocks;
 
 	err = iommu_device_register(&iommu->iommu, &rk_iommu_ops, dev);
 	if (err)
···
 	pm_runtime_disable(dev);
 err_remove_sysfs:
 	iommu_device_sysfs_remove(&iommu->iommu);
-err_put_group:
-	iommu_group_put(iommu->group);
 err_unprepare_clocks:
 	clk_bulk_unprepare(iommu->num_clocks, iommu->clocks);
 	return err;

drivers/iommu/s390-iommu.c

···
 #include <linux/rcupdate.h>
 #include <asm/pci_dma.h>
 
+#include "dma-iommu.h"
+
 static const struct iommu_ops s390_iommu_ops;
+
+static struct kmem_cache *dma_region_table_cache;
+static struct kmem_cache *dma_page_table_cache;
+
+static u64 s390_iommu_aperture;
+static u32 s390_iommu_aperture_factor = 1;
 
 struct s390_domain {
 	struct iommu_domain	domain;
 	struct list_head	devices;
+	struct zpci_iommu_ctrs	ctrs;
 	unsigned long		*dma_table;
 	spinlock_t		list_lock;
 	struct rcu_head		rcu;
 };
+
+static inline unsigned int calc_rtx(dma_addr_t ptr)
+{
+	return ((unsigned long)ptr >> ZPCI_RT_SHIFT) & ZPCI_INDEX_MASK;
+}
+
+static inline unsigned int calc_sx(dma_addr_t ptr)
+{
+	return ((unsigned long)ptr >> ZPCI_ST_SHIFT) & ZPCI_INDEX_MASK;
+}
+
+static inline unsigned int calc_px(dma_addr_t ptr)
+{
+	return ((unsigned long)ptr >> PAGE_SHIFT) & ZPCI_PT_MASK;
+}
+
+static inline void set_pt_pfaa(unsigned long *entry, phys_addr_t pfaa)
+{
+	*entry &= ZPCI_PTE_FLAG_MASK;
+	*entry |= (pfaa & ZPCI_PTE_ADDR_MASK);
+}
+
+static inline void set_rt_sto(unsigned long *entry, phys_addr_t sto)
+{
+	*entry &= ZPCI_RTE_FLAG_MASK;
+	*entry |= (sto & ZPCI_RTE_ADDR_MASK);
+	*entry |= ZPCI_TABLE_TYPE_RTX;
+}
+
+static inline void set_st_pto(unsigned long *entry, phys_addr_t pto)
+{
+	*entry &= ZPCI_STE_FLAG_MASK;
+	*entry |= (pto & ZPCI_STE_ADDR_MASK);
+	*entry |= ZPCI_TABLE_TYPE_SX;
+}
+
+static inline void validate_rt_entry(unsigned long *entry)
+{
+	*entry &= ~ZPCI_TABLE_VALID_MASK;
+	*entry &= ~ZPCI_TABLE_OFFSET_MASK;
+	*entry |= ZPCI_TABLE_VALID;
+	*entry |= ZPCI_TABLE_LEN_RTX;
+}
+
+static inline void validate_st_entry(unsigned long *entry)
+{
+	*entry &= ~ZPCI_TABLE_VALID_MASK;
+	*entry |= ZPCI_TABLE_VALID;
+}
+
+static inline void invalidate_pt_entry(unsigned long *entry)
+{
+	WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_INVALID);
+	*entry &= ~ZPCI_PTE_VALID_MASK;
+	*entry |= ZPCI_PTE_INVALID;
+}
+
+static inline void validate_pt_entry(unsigned long *entry)
+{
+	WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID);
+	*entry &= ~ZPCI_PTE_VALID_MASK;
+	*entry |= ZPCI_PTE_VALID;
+}
+
+static inline void entry_set_protected(unsigned long *entry)
+{
+	*entry &= ~ZPCI_TABLE_PROT_MASK;
+	*entry |= ZPCI_TABLE_PROTECTED;
+}
+
+static inline void entry_clr_protected(unsigned long *entry)
+{
+	*entry &= ~ZPCI_TABLE_PROT_MASK;
+	*entry |= ZPCI_TABLE_UNPROTECTED;
+}
+
+static inline int reg_entry_isvalid(unsigned long entry)
+{
+	return (entry & ZPCI_TABLE_VALID_MASK) == ZPCI_TABLE_VALID;
+}
+
+static inline int pt_entry_isvalid(unsigned long entry)
+{
+	return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID;
+}
+
+static inline unsigned long *get_rt_sto(unsigned long entry)
+{
+	if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX)
+		return phys_to_virt(entry & ZPCI_RTE_ADDR_MASK);
+	else
+		return NULL;
+}
+
+static inline unsigned long *get_st_pto(unsigned long entry)
+{
+	if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_SX)
+		return phys_to_virt(entry & ZPCI_STE_ADDR_MASK);
+	else
+		return NULL;
+}
+
+static int __init dma_alloc_cpu_table_caches(void)
+{
+	dma_region_table_cache = kmem_cache_create("PCI_DMA_region_tables",
+						   ZPCI_TABLE_SIZE,
+						   ZPCI_TABLE_ALIGN,
+						   0, NULL);
+	if (!dma_region_table_cache)
+		return -ENOMEM;
+
+	dma_page_table_cache = kmem_cache_create("PCI_DMA_page_tables",
+						 ZPCI_PT_SIZE,
+						 ZPCI_PT_ALIGN,
+						 0, NULL);
+	if (!dma_page_table_cache) {
+		kmem_cache_destroy(dma_region_table_cache);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+static unsigned long *dma_alloc_cpu_table(gfp_t gfp)
+{
+	unsigned long *table, *entry;
+
+	table = kmem_cache_alloc(dma_region_table_cache, gfp);
+	if (!table)
+		return NULL;
+
+	for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++)
+		*entry = ZPCI_TABLE_INVALID;
+	return table;
+}
+
+static void dma_free_cpu_table(void *table)
+{
+	kmem_cache_free(dma_region_table_cache, table);
+}
+
+static void dma_free_page_table(void *table)
+{
+	kmem_cache_free(dma_page_table_cache, table);
+}
+
+static void dma_free_seg_table(unsigned long entry)
+{
+	unsigned long *sto = get_rt_sto(entry);
+	int sx;
+
+	for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++)
+		if (reg_entry_isvalid(sto[sx]))
+			dma_free_page_table(get_st_pto(sto[sx]));
+
+	dma_free_cpu_table(sto);
+}
+
+static void dma_cleanup_tables(unsigned long *table)
+{
+	int rtx;
+
+	if (!table)
+		return;
+
+	for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
+		if (reg_entry_isvalid(table[rtx]))
+			dma_free_seg_table(table[rtx]);
+
+	dma_free_cpu_table(table);
+}
+
+static unsigned long *dma_alloc_page_table(gfp_t gfp)
+{
+	unsigned long *table, *entry;
+
+	table = kmem_cache_alloc(dma_page_table_cache, gfp);
+	if (!table)
+		return NULL;
+
+	for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++)
+		*entry = ZPCI_PTE_INVALID;
+	return table;
+}
+
+static unsigned long *dma_get_seg_table_origin(unsigned long *rtep, gfp_t gfp)
+{
+	unsigned long old_rte, rte;
+	unsigned long *sto;
+
+	rte = READ_ONCE(*rtep);
+	if (reg_entry_isvalid(rte)) {
+		sto = get_rt_sto(rte);
+	} else {
+		sto = dma_alloc_cpu_table(gfp);
+		if (!sto)
+			return NULL;
+
+		set_rt_sto(&rte, virt_to_phys(sto));
+		validate_rt_entry(&rte);
+		entry_clr_protected(&rte);
+
+		old_rte = cmpxchg(rtep, ZPCI_TABLE_INVALID, rte);
+		if (old_rte != ZPCI_TABLE_INVALID) {
+			/* Somone else was faster, use theirs */
+			dma_free_cpu_table(sto);
+			sto = get_rt_sto(old_rte);
+		}
+	}
+	return sto;
+}
+
+static unsigned long *dma_get_page_table_origin(unsigned long *step, gfp_t gfp)
+{
+	unsigned long old_ste, ste;
+	unsigned long *pto;
+
+	ste = READ_ONCE(*step);
+	if (reg_entry_isvalid(ste)) {
+		pto = get_st_pto(ste);
+	} else {
+		pto = dma_alloc_page_table(gfp);
+		if (!pto)
+			return NULL;
+		set_st_pto(&ste, virt_to_phys(pto));
+		validate_st_entry(&ste);
+		entry_clr_protected(&ste);
+
+		old_ste = cmpxchg(step, ZPCI_TABLE_INVALID, ste);
+		if (old_ste != ZPCI_TABLE_INVALID) {
+			/* Somone else was faster, use theirs */
+			dma_free_page_table(pto);
+			pto = get_st_pto(old_ste);
+		}
+	}
+	return pto;
+}
+
+static unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr, gfp_t gfp)
+{
+	unsigned long *sto, *pto;
+	unsigned int rtx, sx, px;
+
+	rtx = calc_rtx(dma_addr);
+	sto = dma_get_seg_table_origin(&rto[rtx], gfp);
+	if (!sto)
+		return NULL;
+
+	sx = calc_sx(dma_addr);
+	pto = dma_get_page_table_origin(&sto[sx], gfp);
+	if (!pto)
+		return NULL;
+
+	px = calc_px(dma_addr);
+	return &pto[px];
+}
+
+static void dma_update_cpu_trans(unsigned long *ptep, phys_addr_t page_addr, int flags)
+{
+	unsigned long pte;
+
+	pte = READ_ONCE(*ptep);
+	if (flags & ZPCI_PTE_INVALID) {
+		invalidate_pt_entry(&pte);
+	} else {
+		set_pt_pfaa(&pte, page_addr);
+		validate_pt_entry(&pte);
+	}
+
+	if (flags & ZPCI_TABLE_PROTECTED)
+		entry_set_protected(&pte);
+	else
+		entry_clr_protected(&pte);
+
+	xchg(ptep, pte);
+}
 
 static struct s390_domain *to_s390_domain(struct iommu_domain *dom)
 {
···
 
 static bool s390_iommu_capable(struct device *dev, enum iommu_cap cap)
 {
+	struct zpci_dev *zdev = to_zpci_dev(dev);
+
 	switch (cap) {
 	case IOMMU_CAP_CACHE_COHERENCY:
 		return true;
+	case IOMMU_CAP_DEFERRED_FLUSH:
+		return zdev->pft != PCI_FUNC_TYPE_ISM;
 	default:
 		return false;
 	}
 }
 
-static struct iommu_domain *s390_domain_alloc(unsigned domain_type)
+static struct iommu_domain *s390_domain_alloc_paging(struct device *dev)
 {
 	struct s390_domain *s390_domain;
-
-	if (domain_type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	s390_domain = kzalloc(sizeof(*s390_domain), GFP_KERNEL);
 	if (!s390_domain)
···
 	call_rcu(&s390_domain->rcu, s390_iommu_rcu_free_domain);
 }
 
-static void __s390_iommu_detach_device(struct zpci_dev *zdev)
+static void s390_iommu_detach_device(struct iommu_domain *domain,
+				     struct device *dev)
 {
-	struct s390_domain *s390_domain = zdev->s390_domain;
+	struct s390_domain *s390_domain = to_s390_domain(domain);
+	struct zpci_dev *zdev = to_zpci_dev(dev);
 	unsigned long flags;
-
-	if (!s390_domain)
-		return;
 
 	spin_lock_irqsave(&s390_domain->list_lock, flags);
 	list_del_rcu(&zdev->iommu_list);
···
 		return -EINVAL;
 
 	if (zdev->s390_domain)
-		__s390_iommu_detach_device(zdev);
-	else if (zdev->dma_table)
-		zpci_dma_exit_device(zdev);
+		s390_iommu_detach_device(&zdev->s390_domain->domain, dev);
 
 	cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
 				virt_to_phys(s390_domain->dma_table), &status);
···
 	 */
 	if (cc && status != ZPCI_PCI_ST_FUNC_NOT_AVAIL)
 		return -EIO;
-	zdev->dma_table = s390_domain->dma_table;
 
 	zdev->dma_table = s390_domain->dma_table;
 	zdev->s390_domain = s390_domain;
···
 	spin_unlock_irqrestore(&s390_domain->list_lock, flags);
 
 	return 0;
-}
-
-static void s390_iommu_set_platform_dma(struct device *dev)
-{
-	struct zpci_dev *zdev = to_zpci_dev(dev);
-
-	__s390_iommu_detach_device(zdev);
-	zpci_dma_init_device(zdev);
 }
 
 static void s390_iommu_get_resv_regions(struct device *dev,
···
 	if (zdev->end_dma > ZPCI_TABLE_SIZE_RT - 1)
 		zdev->end_dma = ZPCI_TABLE_SIZE_RT - 1;
 
+	if (zdev->tlb_refresh)
+		dev->iommu->shadow_on_flush = 1;
+
 	return &zdev->iommu_dev;
 }
 
···
 	 * to the device, but keep it attached to other devices in the group.
 	 */
 	if (zdev)
-		__s390_iommu_detach_device(zdev);
+		s390_iommu_detach_device(&zdev->s390_domain->domain, dev);
+}
+
+static int zpci_refresh_all(struct zpci_dev *zdev)
+{
+	return zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
+				  zdev->end_dma - zdev->start_dma + 1);
 }
 
 static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
···
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
-		zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
-				   zdev->end_dma - zdev->start_dma + 1);
+		atomic64_inc(&s390_domain->ctrs.global_rpcits);
+		zpci_refresh_all(zdev);
 	}
 	rcu_read_unlock();
 }
···
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
+		atomic64_inc(&s390_domain->ctrs.sync_rpcits);
 		zpci_refresh_trans((u64)zdev->fh << 32, gather->start,
 				   size);
 	}
 	rcu_read_unlock();
 }
 
-static void s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
-				      unsigned long iova, size_t size)
+static int s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
+				     unsigned long iova, size_t size)
 {
 	struct s390_domain *s390_domain = to_s390_domain(domain);
 	struct zpci_dev *zdev;
+	int ret = 0;
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
 		if (!zdev->tlb_refresh)
 			continue;
-		zpci_refresh_trans((u64)zdev->fh << 32,
-				   iova, size);
+		atomic64_inc(&s390_domain->ctrs.sync_map_rpcits);
+		ret = zpci_refresh_trans((u64)zdev->fh << 32,
+					 iova, size);
+		/*
+		 * let the hypervisor discover invalidated entries
+		 * allowing it to free IOVAs and unpin pages
+		 */
+		if (ret == -ENOMEM) {
+			ret = zpci_refresh_all(zdev);
+			if (ret)
+				break;
+		}
 	}
 	rcu_read_unlock();
+
+	return ret;
 }
 
 static int s390_iommu_validate_trans(struct s390_domain *s390_domain,
···
 	if (!IS_ALIGNED(iova | paddr, pgsize))
 		return -EINVAL;
 
-	if (!(prot & IOMMU_READ))
-		return -EINVAL;
-
 	if (!(prot & IOMMU_WRITE))
 		flags |= ZPCI_TABLE_PROTECTED;
 
 	rc = s390_iommu_validate_trans(s390_domain, paddr, iova,
-				       pgcount, flags, gfp);
-	if (!rc)
+				     pgcount, flags, gfp);
+	if (!rc) {
 		*mapped = size;
+		atomic64_add(pgcount, &s390_domain->ctrs.mapped_pages);
+	}
 
 	return rc;
 }
···
 		return 0;
 
 	iommu_iotlb_gather_add_range(gather, iova, size);
+	atomic64_add(pgcount, &s390_domain->ctrs.unmapped_pages);
 
 	return size;
 }
 
+static void s390_iommu_probe_finalize(struct device *dev)
+{
+	iommu_setup_dma_ops(dev, 0, U64_MAX);
+}
+
+struct zpci_iommu_ctrs *zpci_get_iommu_ctrs(struct zpci_dev *zdev)
+{
+	if (!zdev || !zdev->s390_domain)
+		return NULL;
+	return &zdev->s390_domain->ctrs;
+}
+
 int zpci_init_iommu(struct zpci_dev *zdev)
 {
+	u64 aperture_size;
 	int rc = 0;
 
 	rc = iommu_device_sysfs_add(&zdev->iommu_dev, NULL, NULL,
···
 	rc = iommu_device_register(&zdev->iommu_dev, &s390_iommu_ops, NULL);
 	if (rc)
 		goto out_sysfs;
+
+	zdev->start_dma = PAGE_ALIGN(zdev->start_dma);
+	aperture_size = min3(s390_iommu_aperture,
+			     ZPCI_TABLE_SIZE_RT - zdev->start_dma,
+			     zdev->end_dma - zdev->start_dma + 1);
+	zdev->end_dma = zdev->start_dma + aperture_size - 1;
 
 	return 0;
 
···
 	iommu_device_sysfs_remove(&zdev->iommu_dev);
 }
 
+static int __init s390_iommu_setup(char *str)
+{
+	if (!strcmp(str, "strict")) {
+		pr_warn("s390_iommu=strict deprecated; use iommu.strict=1 instead\n");
+		iommu_set_dma_strict();
+	}
+	return 1;
+}
+
+__setup("s390_iommu=", s390_iommu_setup);
+
+static int __init s390_iommu_aperture_setup(char *str)
+{
+	if (kstrtou32(str, 10, &s390_iommu_aperture_factor))
+		s390_iommu_aperture_factor = 1;
+	return 1;
+}
+
+__setup("s390_iommu_aperture=", s390_iommu_aperture_setup);
+
+static int __init s390_iommu_init(void)
+{
+	int rc;
+
+	iommu_dma_forcedac = true;
+	s390_iommu_aperture = (u64)virt_to_phys(high_memory);
+	if (!s390_iommu_aperture_factor)
+		s390_iommu_aperture = ULONG_MAX;
+	else
+		s390_iommu_aperture *= s390_iommu_aperture_factor;
+
+	rc = dma_alloc_cpu_table_caches();
+	if (rc)
+		return rc;
+
+	return rc;
+}
+subsys_initcall(s390_iommu_init);
+
 static const struct iommu_ops s390_iommu_ops = {
 	.capable = s390_iommu_capable,
-	.domain_alloc = s390_domain_alloc,
+	.domain_alloc_paging = s390_domain_alloc_paging,
 	.probe_device = s390_iommu_probe_device,
+	.probe_finalize = s390_iommu_probe_finalize,
 	.release_device = s390_iommu_release_device,
 	.device_group = generic_device_group,
-	.set_platform_dma_ops = s390_iommu_set_platform_dma,
 	.pgsize_bitmap = SZ_4K,
 	.get_resv_regions = s390_iommu_get_resv_regions,
 	.default_domain_ops = &(const struct iommu_domain_ops) {

drivers/iommu/sprd-iommu.c

···
 	void __iomem		*base;
 	struct device		*dev;
 	struct iommu_device	iommu;
-	struct iommu_group	*group;
 	struct clk		*eb;
 };
 
···
 		SPRD_IOMMU_PAGE_SHIFT) * sizeof(u32);
 }
 
-static struct iommu_domain *sprd_iommu_domain_alloc(unsigned int domain_type)
+static struct iommu_domain *sprd_iommu_domain_alloc_paging(struct device *dev)
 {
 	struct sprd_iommu_domain *dom;
-
-	if (domain_type != IOMMU_DOMAIN_DMA && domain_type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	dom = kzalloc(sizeof(*dom), GFP_KERNEL);
 	if (!dom)
···
 	return size;
 }
 
-static void sprd_iommu_sync_map(struct iommu_domain *domain,
-				unsigned long iova, size_t size)
+static int sprd_iommu_sync_map(struct iommu_domain *domain,
+			       unsigned long iova, size_t size)
 {
 	struct sprd_iommu_domain *dom = to_sprd_domain(domain);
 	unsigned int reg;
···
 
 	/* clear IOMMU TLB buffer after page table updated */
 	sprd_iommu_write(dom->sdev, reg, 0xffffffff);
+	return 0;
 }
 
 static void sprd_iommu_sync(struct iommu_domain *domain,
···
 	return &sdev->iommu;
 }
 
-static struct iommu_group *sprd_iommu_device_group(struct device *dev)
-{
-	struct sprd_iommu_device *sdev = dev_iommu_priv_get(dev);
-
-	return iommu_group_ref_get(sdev->group);
-}
-
 static int sprd_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
 {
 	struct platform_device *pdev;
···
 
 
 static const struct iommu_ops sprd_iommu_ops = {
-	.domain_alloc	= sprd_iommu_domain_alloc,
+	.domain_alloc_paging = sprd_iommu_domain_alloc_paging,
 	.probe_device	= sprd_iommu_probe_device,
-	.device_group	= sprd_iommu_device_group,
+	.device_group	= generic_single_device_group,
 	.of_xlate	= sprd_iommu_of_xlate,
 	.pgsize_bitmap	= SPRD_IOMMU_PAGE_SIZE,
 	.owner		= THIS_MODULE,
···
 	platform_set_drvdata(pdev, sdev);
 	sdev->dev = dev;
 
-	/* All the client devices are in the same iommu-group */
-	sdev->group = iommu_group_alloc();
-	if (IS_ERR(sdev->group)) {
-		ret = PTR_ERR(sdev->group);
-		goto free_page;
-	}
-
 	ret = iommu_device_sysfs_add(&sdev->iommu, dev, NULL, dev_name(dev));
 	if (ret)
-		goto put_group;
+		goto free_page;
 
 	ret = iommu_device_register(&sdev->iommu, &sprd_iommu_ops, dev);
 	if (ret)
···
 	iommu_device_unregister(&sdev->iommu);
 remove_sysfs:
 	iommu_device_sysfs_remove(&sdev->iommu);
-put_group:
-	iommu_group_put(sdev->group);
 free_page:
 	dma_free_coherent(sdev->dev, SPRD_IOMMU_PAGE_SIZE, sdev->prot_page_va, sdev->prot_page_pa);
 	return ret;
···
 	struct sprd_iommu_device *sdev = platform_get_drvdata(pdev);
 
 	dma_free_coherent(sdev->dev, SPRD_IOMMU_PAGE_SIZE, sdev->prot_page_va, sdev->prot_page_pa);
-
-	iommu_group_put(sdev->group);
-	sdev->group = NULL;
 
 	platform_set_drvdata(pdev, NULL);
 	iommu_device_sysfs_remove(&sdev->iommu);

drivers/iommu/sun50i-iommu.c

···
 	struct clk *clk;
 
 	struct iommu_domain *domain;
-	struct iommu_group *group;
 	struct kmem_cache *pt_pool;
 };
 
···
 	spin_unlock_irqrestore(&iommu->iommu_lock, flags);
 }
 
-static void sun50i_iommu_iotlb_sync_map(struct iommu_domain *domain,
-					unsigned long iova, size_t size)
+static int sun50i_iommu_iotlb_sync_map(struct iommu_domain *domain,
+				       unsigned long iova, size_t size)
 {
 	struct sun50i_iommu_domain *sun50i_domain = to_sun50i_domain(domain);
 	struct sun50i_iommu *iommu = sun50i_domain->iommu;
···
 	spin_lock_irqsave(&iommu->iommu_lock, flags);
 	sun50i_iommu_zap_range(iommu, iova, size);
 	spin_unlock_irqrestore(&iommu->iommu_lock, flags);
+
+	return 0;
 }
 
 static void sun50i_iommu_iotlb_sync(struct iommu_domain *domain,
···
 }
 
 static int sun50i_iommu_map(struct iommu_domain *domain, unsigned long iova,
-			    phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+			    phys_addr_t paddr, size_t size, size_t count,
+			    int prot, gfp_t gfp, size_t *mapped)
 {
 	struct sun50i_iommu_domain *sun50i_domain = to_sun50i_domain(domain);
 	struct sun50i_iommu *iommu = sun50i_domain->iommu;
···
 
 	*pte_addr = sun50i_mk_pte(paddr, prot);
 	sun50i_table_flush(sun50i_domain, pte_addr, 1);
+	*mapped = size;
 
 out:
 	return ret;
 }
 
 static size_t sun50i_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
-				 size_t size, struct iommu_iotlb_gather *gather)
+				 size_t size, size_t count, struct iommu_iotlb_gather *gather)
 {
 	struct sun50i_iommu_domain *sun50i_domain = to_sun50i_domain(domain);
 	phys_addr_t pt_phys;
···
 		sun50i_iova_get_page_offset(iova);
 }
 
-static struct iommu_domain *sun50i_iommu_domain_alloc(unsigned type)
+static struct iommu_domain *
+sun50i_iommu_domain_alloc_paging(struct device *dev)
 {
 	struct sun50i_iommu_domain *sun50i_domain;
-
-	if (type != IOMMU_DOMAIN_DMA &&
-	    type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	sun50i_domain = kzalloc(sizeof(*sun50i_domain), GFP_KERNEL);
 	if (!sun50i_domain)
···
 	iommu->domain = NULL;
 }
 
-static void sun50i_iommu_detach_device(struct iommu_domain *domain,
-				       struct device *dev)
+static int sun50i_iommu_identity_attach(struct iommu_domain *identity_domain,
+					struct device *dev)
 {
-	struct sun50i_iommu_domain *sun50i_domain = to_sun50i_domain(domain);
 	struct sun50i_iommu *iommu = dev_iommu_priv_get(dev);
+	struct sun50i_iommu_domain *sun50i_domain;
 
 	dev_dbg(dev, "Detaching from IOMMU domain\n");
 
-	if (iommu->domain != domain)
-		return;
+	if (iommu->domain == identity_domain)
+		return 0;
 
+	sun50i_domain = to_sun50i_domain(iommu->domain);
 	if (refcount_dec_and_test(&sun50i_domain->refcnt))
 		sun50i_iommu_detach_domain(iommu, sun50i_domain);
+	return 0;
 }
+
+static struct iommu_domain_ops sun50i_iommu_identity_ops = {
+	.attach_dev = sun50i_iommu_identity_attach,
+};
+
+static struct iommu_domain sun50i_iommu_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &sun50i_iommu_identity_ops,
+};
 
 static int sun50i_iommu_attach_device(struct iommu_domain *domain,
 				      struct device *dev)
···
 	if (iommu->domain == domain)
 		return 0;
 
-	if (iommu->domain)
-		sun50i_iommu_detach_device(iommu->domain, dev);
+	sun50i_iommu_identity_attach(&sun50i_iommu_identity_domain, dev);
 
 	sun50i_iommu_attach_domain(iommu, sun50i_domain);
 
···
 	return &iommu->iommu;
 }
 
-static struct iommu_group *sun50i_iommu_device_group(struct device *dev)
-{
-	struct sun50i_iommu *iommu = sun50i_iommu_from_dev(dev);
-
-	return iommu_group_ref_get(iommu->group);
-}
-
 static int sun50i_iommu_of_xlate(struct device *dev,
 				 struct of_phandle_args *args)
 {
···
 }
 
 static const struct iommu_ops sun50i_iommu_ops = {
+	.identity_domain = &sun50i_iommu_identity_domain,
 	.pgsize_bitmap	= SZ_4K,
-	.device_group	= sun50i_iommu_device_group,
-	.domain_alloc	= sun50i_iommu_domain_alloc,
+	.device_group	= generic_single_device_group,
+	.domain_alloc_paging = sun50i_iommu_domain_alloc_paging,
 	.of_xlate	= sun50i_iommu_of_xlate,
 	.probe_device	= sun50i_iommu_probe_device,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
···
 		.iotlb_sync_map = sun50i_iommu_iotlb_sync_map,
 		.iotlb_sync	= sun50i_iommu_iotlb_sync,
 		.iova_to_phys	= sun50i_iommu_iova_to_phys,
-		.map		= sun50i_iommu_map,
-		.unmap		= sun50i_iommu_unmap,
+		.map_pages	= sun50i_iommu_map,
+		.unmap_pages	= sun50i_iommu_unmap,
 		.free		= sun50i_iommu_domain_free,
 	}
 };
···
 	if (!iommu)
 		return -ENOMEM;
 	spin_lock_init(&iommu->iommu_lock);
+	iommu->domain = &sun50i_iommu_identity_domain;
 	platform_set_drvdata(pdev, iommu);
 	iommu->dev = &pdev->dev;
 
···
 	if (!iommu->pt_pool)
 		return -ENOMEM;
 
-	iommu->group = iommu_group_alloc();
-	if (IS_ERR(iommu->group)) {
-		ret = PTR_ERR(iommu->group);
-		goto err_free_cache;
-	}
-
 	iommu->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(iommu->base)) {
 		ret = PTR_ERR(iommu->base);
-		goto err_free_group;
+		goto err_free_cache;
 	}
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		ret = irq;
-		goto err_free_group;
+		goto err_free_cache;
 	}
 
 	iommu->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(iommu->clk)) {
 		dev_err(&pdev->dev, "Couldn't get our clock.\n");
 		ret = PTR_ERR(iommu->clk);
-		goto err_free_group;
+		goto err_free_cache;
 	}
 
 	iommu->reset = devm_reset_control_get(&pdev->dev, NULL);
 	if (IS_ERR(iommu->reset)) {
 		dev_err(&pdev->dev, "Couldn't get our reset line.\n");
 		ret = PTR_ERR(iommu->reset);
-		goto err_free_group;
+		goto err_free_cache;
 	}
 
 	ret = iommu_device_sysfs_add(&iommu->iommu, &pdev->dev,
 				     NULL, dev_name(&pdev->dev));
 	if (ret)
-		goto err_free_group;
+		goto err_free_cache;
 
 	ret = iommu_device_register(&iommu->iommu, &sun50i_iommu_ops, &pdev->dev);
 	if (ret)
···
 
 err_remove_sysfs:
 	iommu_device_sysfs_remove(&iommu->iommu);
-
-err_free_group:
-	iommu_group_put(iommu->group);
 
 err_free_cache:
 	kmem_cache_destroy(iommu->pt_pool);

drivers/iommu/tegra-gart.c

···
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * IOMMU API for Graphics Address Relocation Table on Tegra20
- *
- * Copyright (c) 2010-2012, NVIDIA CORPORATION.  All rights reserved.
- *
- * Author: Hiroshi DOYU <[e-mail]>
- */
-
-#define dev_fmt(fmt)	"gart: " fmt
-
-#include <linux/io.h>
-#include <linux/iommu.h>
-#include <linux/moduleparam.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/vmalloc.h>
-
-#include <soc/tegra/mc.h>
-
-#define GART_REG_BASE		0x24
-#define GART_CONFIG		(0x24 - GART_REG_BASE)
-#define GART_ENTRY_ADDR		(0x28 - GART_REG_BASE)
-#define GART_ENTRY_DATA		(0x2c - GART_REG_BASE)
-
-#define GART_ENTRY_PHYS_ADDR_VALID	BIT(31)
-
-#define GART_PAGE_SHIFT		12
-#define GART_PAGE_SIZE		(1 << GART_PAGE_SHIFT)
-#define GART_PAGE_MASK		GENMASK(30, GART_PAGE_SHIFT)
-
-/* bitmap of the page sizes currently supported */
-#define GART_IOMMU_PGSIZES	(GART_PAGE_SIZE)
-
-struct gart_device {
-	void __iomem		*regs;
-	u32			*savedata;
-	unsigned long		iovmm_base;	/* offset to vmm_area start */
-	unsigned long		iovmm_end;	/* offset to vmm_area end */
-	spinlock_t		pte_lock;	/* for pagetable */
-	spinlock_t		dom_lock;	/* for active domain */
-	unsigned int		active_devices;	/* number of active devices */
-	struct iommu_domain	*active_domain;	/* current active domain */
-	struct iommu_device	iommu;		/* IOMMU Core handle */
-	struct device		*dev;
-};
-
-static struct gart_device *gart_handle; /* unique for a system */
-
-static bool gart_debug;
-
-/*
- * Any interaction between any block on PPSB and a block on APB or AHB
- * must have these read-back to ensure the APB/AHB bus transaction is
- * complete before initiating activity on the PPSB block.
- */
-#define FLUSH_GART_REGS(gart)	readl_relaxed((gart)->regs + GART_CONFIG)
-
-#define for_each_gart_pte(gart, iova)					\
-	for (iova = gart->iovmm_base;					\
-	     iova < gart->iovmm_end;					\
-	     iova += GART_PAGE_SIZE)
-
-static inline void gart_set_pte(struct gart_device *gart,
-				unsigned long iova, unsigned long pte)
-{
-	writel_relaxed(iova, gart->regs + GART_ENTRY_ADDR);
-	writel_relaxed(pte, gart->regs + GART_ENTRY_DATA);
-}
-
-static inline unsigned long gart_read_pte(struct gart_device *gart,
-					  unsigned long iova)
-{
-	unsigned long pte;
-
-	writel_relaxed(iova, gart->regs + GART_ENTRY_ADDR);
-	pte = readl_relaxed(gart->regs + GART_ENTRY_DATA);
-
-	return pte;
-}
-
-static void do_gart_setup(struct gart_device *gart, const u32 *data)
-{
-	unsigned long iova;
-
-	for_each_gart_pte(gart, iova)
-		gart_set_pte(gart, iova, data ? *(data++) : 0);
-
-	writel_relaxed(1, gart->regs + GART_CONFIG);
-	FLUSH_GART_REGS(gart);
-}
-
-static inline bool gart_iova_range_invalid(struct gart_device *gart,
-					   unsigned long iova, size_t bytes)
-{
-	return unlikely(iova < gart->iovmm_base || bytes != GART_PAGE_SIZE ||
-			iova + bytes > gart->iovmm_end);
-}
-
-static inline bool gart_pte_valid(struct gart_device *gart, unsigned long iova)
-{
-	return !!(gart_read_pte(gart, iova) & GART_ENTRY_PHYS_ADDR_VALID);
-}
-
-static int gart_iommu_attach_dev(struct iommu_domain *domain,
-				 struct device *dev)
-{
-	struct gart_device *gart = gart_handle;
-	int ret = 0;
-
-	spin_lock(&gart->dom_lock);
-
-	if (gart->active_domain && gart->active_domain != domain) {
-		ret = -EINVAL;
-	} else if (dev_iommu_priv_get(dev) != domain) {
-		dev_iommu_priv_set(dev, domain);
-		gart->active_domain = domain;
-		gart->active_devices++;
-	}
-
-	spin_unlock(&gart->dom_lock);
-
-	return ret;
-}
-
-static void gart_iommu_set_platform_dma(struct device *dev)
-{
-	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
-	struct gart_device *gart = gart_handle;
-
-	spin_lock(&gart->dom_lock);
-
-	if (dev_iommu_priv_get(dev) == domain) {
-		dev_iommu_priv_set(dev, NULL);
-
-		if (--gart->active_devices == 0)
-			gart->active_domain = NULL;
-	}
-
-	spin_unlock(&gart->dom_lock);
-}
-
-static struct iommu_domain *gart_iommu_domain_alloc(unsigned type)
-{
-	struct iommu_domain *domain;
-
-	if (type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
-
-	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
-	if (domain) {
-		domain->geometry.aperture_start = gart_handle->iovmm_base;
-		domain->geometry.aperture_end = gart_handle->iovmm_end - 1;
-		domain->geometry.force_aperture = true;
-	}
-
-	return domain;
-}
-
-static void gart_iommu_domain_free(struct iommu_domain *domain)
-{
-	WARN_ON(gart_handle->active_domain == domain);
-	kfree(domain);
-}
-
-static inline int __gart_iommu_map(struct gart_device *gart, unsigned long iova,
-				   unsigned long pa)
-{
-	if (unlikely(gart_debug && gart_pte_valid(gart, iova))) {
-		dev_err(gart->dev, "Page entry is in-use\n");
-		return -EINVAL;
-	}
-
-	gart_set_pte(gart, iova, GART_ENTRY_PHYS_ADDR_VALID | pa);
-
-	return 0;
-}
-
-static int gart_iommu_map(struct iommu_domain *domain, unsigned long iova,
-			  phys_addr_t pa, size_t bytes, int prot, gfp_t gfp)
-{
-	struct gart_device *gart = gart_handle;
-	int ret;
-
-	if (gart_iova_range_invalid(gart, iova, bytes))
-		return -EINVAL;
-
-	spin_lock(&gart->pte_lock);
-	ret = __gart_iommu_map(gart, iova, (unsigned long)pa);
-	spin_unlock(&gart->pte_lock);
-
-	return ret;
-}
-
-static inline int __gart_iommu_unmap(struct gart_device *gart,
-				     unsigned long iova)
-{
-	if (unlikely(gart_debug && !gart_pte_valid(gart, iova))) {
-		dev_err(gart->dev, "Page entry is invalid\n");
-		return -EINVAL;
-	}
-
-	gart_set_pte(gart, iova, 0);
-
-	return 0;
-}
-
-static size_t gart_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
-			       size_t bytes, struct iommu_iotlb_gather *gather)
-{
-	struct gart_device *gart = gart_handle;
-	int err;
-
-	if (gart_iova_range_invalid(gart, iova, bytes))
-		return 0;
-
-	spin_lock(&gart->pte_lock);
-	err = __gart_iommu_unmap(gart, iova);
-	spin_unlock(&gart->pte_lock);
-
-	return err ? 0 : bytes;
-}
-
-static phys_addr_t gart_iommu_iova_to_phys(struct iommu_domain *domain,
-					   dma_addr_t iova)
-{
-	struct gart_device *gart = gart_handle;
-	unsigned long pte;
-
-	if (gart_iova_range_invalid(gart, iova, GART_PAGE_SIZE))
-		return -EINVAL;
-
-	spin_lock(&gart->pte_lock);
-	pte = gart_read_pte(gart, iova);
-	spin_unlock(&gart->pte_lock);
-
-	return pte & GART_PAGE_MASK;
-}
-
-static struct iommu_device *gart_iommu_probe_device(struct device *dev)
-{
-	if (!dev_iommu_fwspec_get(dev))
-		return ERR_PTR(-ENODEV);
-
-	return &gart_handle->iommu;
-}
-
-static int gart_iommu_of_xlate(struct device *dev,
-			       struct of_phandle_args *args)
-{
-	return 0;
-}
-
-static void gart_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
-				size_t size)
-{
-	FLUSH_GART_REGS(gart_handle);
-}
-
-static void gart_iommu_sync(struct iommu_domain *domain,
-			    struct iommu_iotlb_gather *gather)
-{
-	size_t length = gather->end - gather->start + 1;
-
-	gart_iommu_sync_map(domain, gather->start, length);
-}
-
-static const struct iommu_ops gart_iommu_ops = {
-	.domain_alloc	= gart_iommu_domain_alloc,
-	.probe_device	= gart_iommu_probe_device,
-	.device_group	= generic_device_group,
-	.set_platform_dma_ops = gart_iommu_set_platform_dma,
-	.pgsize_bitmap	= GART_IOMMU_PGSIZES,
-	.of_xlate	= gart_iommu_of_xlate,
-	.default_domain_ops = &(const struct iommu_domain_ops) {
-		.attach_dev	= gart_iommu_attach_dev,
-		.map		= gart_iommu_map,
-		.unmap		= gart_iommu_unmap,
-		.iova_to_phys	= gart_iommu_iova_to_phys,
-		.iotlb_sync_map	= gart_iommu_sync_map,
-		.iotlb_sync	= gart_iommu_sync,
-		.free		= gart_iommu_domain_free,
-	}
-};
-
-int tegra_gart_suspend(struct gart_device *gart)
-{
-	u32 *data = gart->savedata;
-	unsigned long iova;
-
-	/*
-	 * All GART users shall be suspended at this point. Disable
-	 * address translation to trap all GART accesses as invalid
-	 * memory accesses.
-	 */
-	writel_relaxed(0, gart->regs + GART_CONFIG);
-	FLUSH_GART_REGS(gart);
-
-	for_each_gart_pte(gart, iova)
-		*(data++) = gart_read_pte(gart, iova);
-
-	return 0;
-}
-
-int tegra_gart_resume(struct gart_device *gart)
-{
-	do_gart_setup(gart, gart->savedata);
-
-	return 0;
-}
-
-struct gart_device *tegra_gart_probe(struct device *dev, struct tegra_mc *mc)
-{
-	struct gart_device *gart;
-	struct resource *res;
-	int err;
-
-	BUILD_BUG_ON(PAGE_SHIFT != GART_PAGE_SHIFT);
-
-	/* the GART memory aperture is required */
-	res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 1);
-	if (!res) {
-		dev_err(dev, "Memory aperture resource unavailable\n");
-		return ERR_PTR(-ENXIO);
-	}
-
-	gart = kzalloc(sizeof(*gart), GFP_KERNEL);
-	if (!gart)
-		return ERR_PTR(-ENOMEM);
-
-	gart_handle = gart;
-
-	gart->dev = dev;
-	gart->regs = mc->regs + GART_REG_BASE;
-	gart->iovmm_base = res->start;
-	gart->iovmm_end = res->end + 1;
-	spin_lock_init(&gart->pte_lock);
-	spin_lock_init(&gart->dom_lock);
-
-	do_gart_setup(gart, NULL);
-
-	err = iommu_device_sysfs_add(&gart->iommu, dev, NULL, "gart");
-	if (err)
-		goto free_gart;
-
-	err = iommu_device_register(&gart->iommu, &gart_iommu_ops, dev);
-	if (err)
-		goto remove_sysfs;
-
-	gart->savedata = vmalloc(resource_size(res) / GART_PAGE_SIZE *
-				 sizeof(u32));
-	if (!gart->savedata) {
-		err = -ENOMEM;
-		goto unregister_iommu;
-	}
-
-	return gart;
-
-unregister_iommu:
-	iommu_device_unregister(&gart->iommu);
-remove_sysfs:
-	iommu_device_sysfs_remove(&gart->iommu);
-free_gart:
-	kfree(gart);
-
-	return ERR_PTR(err);
-}
-
-module_param(gart_debug, bool, 0644);
-MODULE_PARM_DESC(gart_debug, "Enable GART debugging");

drivers/iommu/tegra-smmu.c

···
 	clear_bit(id, smmu->asids);
 }
 
-static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
+static struct iommu_domain *tegra_smmu_domain_alloc_paging(struct device *dev)
 {
 	struct tegra_smmu_as *as;
-
-	if (type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
 
 	as = kzalloc(sizeof(*as), GFP_KERNEL);
 	if (!as)
···
 	return err;
 }
 
-static void tegra_smmu_set_platform_dma(struct device *dev)
+static int tegra_smmu_identity_attach(struct iommu_domain *identity_domain,
+				      struct device *dev)
 {
 	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
-	struct tegra_smmu_as *as = to_smmu_as(domain);
-	struct tegra_smmu *smmu = as->smmu;
+	struct tegra_smmu_as *as;
+	struct tegra_smmu *smmu;
 	unsigned int index;
 
 	if (!fwspec)
-		return;
+		return -ENODEV;
 
+	if (domain == identity_domain || !domain)
+		return 0;
+
+	as = to_smmu_as(domain);
+	smmu = as->smmu;
 	for (index = 0; index < fwspec->num_ids; index++) {
 		tegra_smmu_disable(smmu, fwspec->ids[index], as->id);
 		tegra_smmu_as_unprepare(smmu, as);
 	}
+	return 0;
 }
+
+static struct iommu_domain_ops tegra_smmu_identity_ops = {
+	.attach_dev = tegra_smmu_identity_attach,
+};
+
+static struct iommu_domain tegra_smmu_identity_domain = {
+	.type = IOMMU_DOMAIN_IDENTITY,
+	.ops = &tegra_smmu_identity_ops,
+};
 
 static void tegra_smmu_set_pde(struct tegra_smmu_as *as, unsigned long iova,
 			       u32 value)
···
 }
 
 static int tegra_smmu_map(struct iommu_domain *domain, unsigned long iova,
-			  phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+			  phys_addr_t paddr, size_t size, size_t count,
+			  int prot, gfp_t gfp, size_t *mapped)
 {
 	struct tegra_smmu_as *as = to_smmu_as(domain);
 	unsigned long flags;
···
 	ret = __tegra_smmu_map(domain, iova, paddr, size, prot, gfp, &flags);
 	spin_unlock_irqrestore(&as->lock, flags);
 
+	if (!ret)
+		*mapped = size;
+
 	return ret;
 }
 
 static size_t tegra_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
-			       size_t size, struct iommu_iotlb_gather *gather)
+			       size_t size, size_t count, struct iommu_iotlb_gather *gather)
 {
 	struct tegra_smmu_as *as = to_smmu_as(domain);
 	unsigned long flags;
···
 	return iommu_fwspec_add_ids(dev, &id, 1);
 }
 
+static int tegra_smmu_def_domain_type(struct device *dev)
+{
+	/*
+	 * FIXME: For now we want to run all translation in IDENTITY mode, due
+	 * to some device quirks. Better would be to just quirk the troubled
+	 * devices.
+	 */
+	return IOMMU_DOMAIN_IDENTITY;
+}
+
 static const struct iommu_ops tegra_smmu_ops = {
-	.domain_alloc = tegra_smmu_domain_alloc,
+	.identity_domain = &tegra_smmu_identity_domain,
+	.def_domain_type = &tegra_smmu_def_domain_type,
+	.domain_alloc_paging = tegra_smmu_domain_alloc_paging,
 	.probe_device = tegra_smmu_probe_device,
 	.device_group = tegra_smmu_device_group,
-	.set_platform_dma_ops = tegra_smmu_set_platform_dma,
 	.of_xlate = tegra_smmu_of_xlate,
 	.pgsize_bitmap = SZ_4K,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= tegra_smmu_attach_dev,
-		.map		= tegra_smmu_map,
-		.unmap		= tegra_smmu_unmap,
+		.map_pages	= tegra_smmu_map,
+		.unmap_pages	= tegra_smmu_unmap,
 		.iova_to_phys	= tegra_smmu_iova_to_phys,
 		.free		= tegra_smmu_domain_free,
 	}
···
 static void tegra_smmu_debugfs_init(struct tegra_smmu *smmu)
 {
 	smmu->debugfs = debugfs_create_dir("smmu", NULL);
-	if (!smmu->debugfs)
-		return;
 
 	debugfs_create_file("swgroups", S_IRUGO, smmu->debugfs, smmu,
 			    &tegra_smmu_swgroups_fops);

drivers/iommu/virtio-iommu.c

···
 	void				*writeback;
 	unsigned int			write_offset;
 	unsigned int			len;
-	char				buf[];
+	char				buf[] __counted_by(len);
 };
 
 #define VIOMMU_FAULT_RESV_MASK		0xffffff00
···
 	if (write_offset <= 0)
 		return -EINVAL;
 
-	req = kzalloc(sizeof(*req) + len, GFP_ATOMIC);
+	req = kzalloc(struct_size(req, buf, len), GFP_ATOMIC);
 	if (!req)
 		return -ENOMEM;
 

drivers/memory/tegra/mc.c

···
 		}
 	}
 
-	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && !mc->soc->smmu) {
-		mc->gart = tegra_gart_probe(&pdev->dev, mc);
-		if (IS_ERR(mc->gart)) {
-			dev_err(&pdev->dev, "failed to probe GART: %ld\n",
-				PTR_ERR(mc->gart));
-			mc->gart = NULL;
-		}
-	}
-
-	return 0;
-}
-
-static int __maybe_unused tegra_mc_suspend(struct device *dev)
-{
-	struct tegra_mc *mc = dev_get_drvdata(dev);
-
-	if (mc->soc->ops && mc->soc->ops->suspend)
-		return mc->soc->ops->suspend(mc);
-
-	return 0;
-}
-
-static int __maybe_unused tegra_mc_resume(struct device *dev)
-{
-	struct tegra_mc *mc = dev_get_drvdata(dev);
-
-	if (mc->soc->ops && mc->soc->ops->resume)
-		return mc->soc->ops->resume(mc);
-
 	return 0;
 }
 
···
 		icc_sync_state(dev);
 }
 
-static const struct dev_pm_ops tegra_mc_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(tegra_mc_suspend, tegra_mc_resume)
-};
-
 static struct platform_driver tegra_mc_driver = {
 	.driver = {
 		.name = "tegra-mc",
 		.of_match_table = tegra_mc_of_match,
-		.pm = &tegra_mc_pm_ops,
 		.suppress_bind_attrs = true,
 		.sync_state = tegra_mc_sync_state,
 	},

drivers/memory/tegra/tegra20.c

···
 	return 0;
 }
 
-static int tegra20_mc_suspend(struct tegra_mc *mc)
-{
-	int err;
-
-	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
-		err = tegra_gart_suspend(mc->gart);
-		if (err < 0)
-			return err;
-	}
-
-	return 0;
-}
-
-static int tegra20_mc_resume(struct tegra_mc *mc)
-{
-	int err;
-
-	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
-		err = tegra_gart_resume(mc->gart);
-		if (err < 0)
-			return err;
-	}
-
-	return 0;
-}
-
 static irqreturn_t tegra20_mc_handle_irq(int irq, void *data)
 {
 	struct tegra_mc *mc = data;
···
 
 static const struct tegra_mc_ops tegra20_mc_ops = {
 	.probe = tegra20_mc_probe,
-	.suspend = tegra20_mc_suspend,
-	.resume = tegra20_mc_resume,
 	.handle_irq = tegra20_mc_handle_irq,
 };
 

include/linux/amd-iommu.h

···
 
 extern int amd_iommu_detect(void);
 
-/**
- * amd_iommu_init_device() - Init device for use with IOMMUv2 driver
- * @pdev: The PCI device to initialize
- * @pasids: Number of PASIDs to support for this device
- *
- * This function does all setup for the device pdev so that it can be
- * used with IOMMUv2.
- * Returns 0 on success or negative value on error.
- */
-extern int amd_iommu_init_device(struct pci_dev *pdev, int pasids);
-
-/**
- * amd_iommu_free_device() - Free all IOMMUv2 related device resources
- *			     and disable IOMMUv2 usage for this device
- * @pdev: The PCI device to disable IOMMUv2 usage for'
- */
-extern void amd_iommu_free_device(struct pci_dev *pdev);
-
-/**
- * amd_iommu_bind_pasid() - Bind a given task to a PASID on a device
- * @pdev: The PCI device to bind the task to
- * @pasid: The PASID on the device the task should be bound to
- * @task: the task to bind
- *
- * The function returns 0 on success or a negative value on error.
- */
-extern int amd_iommu_bind_pasid(struct pci_dev *pdev, u32 pasid,
-				struct task_struct *task);
-
-/**
- * amd_iommu_unbind_pasid() - Unbind a PASID from its task on
- *			      a device
- * @pdev: The device of the PASID
- * @pasid: The PASID to unbind
- *
- * When this function returns the device is no longer using the PASID
- * and the PASID is no longer bound to its task.
- */
-extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, u32 pasid);
-
-/**
- * amd_iommu_set_invalid_ppr_cb() - Register a call-back for failed
- *				    PRI requests
- * @pdev: The PCI device the call-back should be registered for
- * @cb: The call-back function
- *
- * The IOMMUv2 driver invokes this call-back when it is unable to
- * successfully handle a PRI request. The device driver can then decide
- * which PRI response the device should see. Possible return values for
- * the call-back are:
- *
- * - AMD_IOMMU_INV_PRI_RSP_SUCCESS - Send SUCCESS back to the device
- * - AMD_IOMMU_INV_PRI_RSP_INVALID - Send INVALID back to the device
- * - AMD_IOMMU_INV_PRI_RSP_FAIL    - Send Failure back to the device,
- *				     the device is required to disable
- *				     PRI when it receives this response
- *
- * The function returns 0 on success or negative value on error.
- */
-#define AMD_IOMMU_INV_PRI_RSP_SUCCESS	0
-#define AMD_IOMMU_INV_PRI_RSP_INVALID	1
-#define AMD_IOMMU_INV_PRI_RSP_FAIL	2
-
-typedef int (*amd_iommu_invalid_ppr_cb)(struct pci_dev *pdev,
-					u32 pasid,
-					unsigned long address,
-					u16);
-
-extern int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
-					amd_iommu_invalid_ppr_cb cb);
-
-#define PPR_FAULT_EXEC	(1 << 1)
-#define PPR_FAULT_READ  (1 << 2)
-#define PPR_FAULT_WRITE (1 << 5)
-#define PPR_FAULT_USER  (1 << 6)
-#define PPR_FAULT_RSVD  (1 << 7)
-#define PPR_FAULT_GN    (1 << 8)
-
-/**
- * amd_iommu_device_info() - Get information about IOMMUv2 support of a
- *			     PCI device
- * @pdev: PCI device to query information from
- * @info: A pointer to an amd_iommu_device_info structure which will contain
- *	  the information about the PCI device
- *
- * Returns 0 on success, negative value on error
- */
-
-#define AMD_IOMMU_DEVICE_FLAG_ATS_SUP     0x1    /* ATS feature supported */
-#define AMD_IOMMU_DEVICE_FLAG_PRI_SUP     0x2    /* PRI feature supported */
-#define AMD_IOMMU_DEVICE_FLAG_PASID_SUP   0x4    /* PASID context supported */
-#define AMD_IOMMU_DEVICE_FLAG_EXEC_SUP    0x8    /* Device may request execution
-						    on memory pages */
-#define AMD_IOMMU_DEVICE_FLAG_PRIV_SUP   0x10    /* Device may request
-						    super-user privileges */
-
-struct amd_iommu_device_info {
-	int max_pasids;
-	u32 flags;
-};
-
-extern int amd_iommu_device_info(struct pci_dev *pdev,
-				 struct amd_iommu_device_info *info);
-
-/**
- * amd_iommu_set_invalidate_ctx_cb() - Register a call-back for invalidating
- *				       a pasid context. This call-back is
- *				       invoked when the IOMMUv2 driver needs to
- *				       invalidate a PASID context, for example
- *				       because the task that is bound to that
- *				       context is about to exit.
- *
- * @pdev: The PCI device the call-back should be registered for
- * @cb: The call-back function
- */
-
-typedef void (*amd_iommu_invalidate_ctx)(struct pci_dev *pdev, u32 pasid);
-
-extern int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
-					   amd_iommu_invalidate_ctx cb);
 #else /* CONFIG_AMD_IOMMU */
 
 static inline int amd_iommu_detect(void) { return -ENODEV; }

include/linux/iommu.h

···
 #define __IOMMU_DOMAIN_DMA_FQ	(1U << 3)  /* DMA-API uses flush queue    */
 
 #define __IOMMU_DOMAIN_SVA	(1U << 4)  /* Shared process address space */
+#define __IOMMU_DOMAIN_PLATFORM	(1U << 5)
 
 #define IOMMU_DOMAIN_ALLOC_FLAGS ~__IOMMU_DOMAIN_DMA_FQ
 /*
···
  *				  invalidation.
  *	IOMMU_DOMAIN_SVA	- DMA addresses are shared process addresses
  *				  represented by mm_struct's.
+ *	IOMMU_DOMAIN_PLATFORM	- Legacy domain for drivers that do their own
+ *				  dma_api stuff. Do not use in new drivers.
  */
 #define IOMMU_DOMAIN_BLOCKED	(0U)
 #define IOMMU_DOMAIN_IDENTITY	(__IOMMU_DOMAIN_PT)
···
 				 __IOMMU_DOMAIN_DMA_API |	\
 				 __IOMMU_DOMAIN_DMA_FQ)
 #define IOMMU_DOMAIN_SVA	(__IOMMU_DOMAIN_SVA)
+#define IOMMU_DOMAIN_PLATFORM	(__IOMMU_DOMAIN_PLATFORM)
 
 struct iommu_domain {
 	unsigned type;
···
  *           use. The information type is one of enum iommu_hw_info_type defined
  *           in include/uapi/linux/iommufd.h.
  * @domain_alloc: allocate iommu domain
+ * @domain_alloc_paging: Allocate an iommu_domain that can be used for
+ *                       UNMANAGED, DMA, and DMA_FQ domain types.
  * @probe_device: Add device to iommu driver handling
  * @release_device: Remove device from iommu driver handling
  * @probe_finalize: Do final setup work after the device is added to an IOMMU
  *                  group and attached to the groups domain
- * @set_platform_dma_ops: Returning control back to the platform DMA ops. This op
- *                        is to support old IOMMU drivers, new drivers should use
- *                        default domains, and the common IOMMU DMA ops.
  * @device_group: find iommu group for a particular device
  * @get_resv_regions: Request list of reserved regions for a device
  * @of_xlate: add OF master IDs to iommu grouping
···
  *                    will be blocked by the hardware.
  * @pgsize_bitmap: bitmap of all possible supported page sizes
  * @owner: Driver module providing these ops
+ * @identity_domain: An always available, always attachable identity
+ *                   translation.
+ * @blocked_domain: An always available, always attachable blocking
+ *                  translation.
+ * @default_domain: If not NULL this will always be set as the default domain.
+ *                  This should be an IDENTITY/BLOCKED/PLATFORM domain.
+ *                  Do not use in new drivers.
  */
 struct iommu_ops {
 	bool (*capable)(struct device *dev, enum iommu_cap);
···
 
 	/* Domain allocation and freeing by the iommu driver */
 	struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
+	struct iommu_domain *(*domain_alloc_paging)(struct device *dev);
 
 	struct iommu_device *(*probe_device)(struct device *dev);
 	void (*release_device)(struct device *dev);
 	void (*probe_finalize)(struct device *dev);
-	void (*set_platform_dma_ops)(struct device *dev);
 	struct iommu_group *(*device_group)(struct device *dev);
 
 	/* Request/Free a list of reserved regions for a device */
···
 	const struct iommu_domain_ops *default_domain_ops;
 	unsigned long pgsize_bitmap;
 	struct module *owner;
+	struct iommu_domain *identity_domain;
+	struct iommu_domain *blocked_domain;
+	struct iommu_domain *default_domain;
 };
 
 /**
···
  * * ENODEV	- device specific errors, not able to be attached
  * * <others>	- treated as ENODEV by the caller. Use is discouraged
  * @set_dev_pasid: set an iommu domain to a pasid of device
- * @map: map a physically contiguous memory region to an iommu domain
  * @map_pages: map a physically contiguous set of pages of the same size to
  *             an iommu domain.
- * @unmap: unmap a physically contiguous memory region from an iommu domain
  * @unmap_pages: unmap a number of pages of the same size from an iommu domain
  * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
  * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
···
 	int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
 			     ioasid_t pasid);
 
-	int (*map)(struct iommu_domain *domain, unsigned long iova,
-		   phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
 	int (*map_pages)(struct iommu_domain *domain, unsigned long iova,
 			 phys_addr_t paddr, size_t pgsize, size_t pgcount,
 			 int prot, gfp_t gfp, size_t *mapped);
-	size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
-			size_t size, struct iommu_iotlb_gather *iotlb_gather);
 	size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,
 			      size_t pgsize, size_t pgcount,
 			      struct iommu_iotlb_gather *iotlb_gather);
 
 	void (*flush_iotlb_all)(struct iommu_domain *domain);
-	void (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
-			       size_t size);
+	int (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
+			      size_t size);
 	void (*iotlb_sync)(struct iommu_domain *domain,
 			   struct iommu_iotlb_gather *iotlb_gather);
 
···
  * @list: Used by the iommu-core to keep a list of registered iommus
  * @ops: iommu-ops for talking to this iommu
  * @dev: struct device for sysfs handling
+ * @singleton_group: Used internally for drivers that have only one group
  * @max_pasids: number of supported PASIDs
  */
 struct iommu_device {
···
 	const struct iommu_ops *ops;
 	struct fwnode_handle *fwnode;
 	struct device *dev;
+	struct iommu_group *singleton_group;
 	u32 max_pasids;
 };
 
···
  * @attach_deferred: the dma domain attachment is deferred
  * @pci_32bit_workaround: Limit DMA allocations to 32-bit IOVAs
  * @require_direct: device requires IOMMU_RESV_DIRECT regions
+ * @shadow_on_flush: IOTLB flushes are used to sync shadow tables
  *
  * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
  *	struct iommu_group	*iommu_group;
···
 	u32				attach_deferred:1;
 	u32				pci_32bit_workaround:1;
 	u32				require_direct:1;
+	u32				shadow_on_flush:1;
 };
 
 int iommu_device_register(struct iommu_device *iommu,
···
 extern struct iommu_group *generic_device_group(struct device *dev);
 /* FSL-MC device grouping function */
 struct iommu_group *fsl_mc_device_group(struct device *dev);
+extern struct iommu_group *generic_single_device_group(struct device *dev);
 
 /**
  * struct iommu_fwspec - per-device IOMMU instance data
···
  * Creates a mapping at @iova for the buffer described by a scatterlist
  * stored in the given sg_table object in the provided IOMMU domain.
  */
-static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
+static inline ssize_t iommu_map_sgtable(struct iommu_domain *domain,
 			unsigned long iova, struct sg_table *sgt, int prot)
 {
 	return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot,

include/soc/tegra/mc.h

···
 
 struct tegra_mc;
 struct tegra_smmu;
-struct gart_device;
 
 #ifdef CONFIG_TEGRA_IOMMU_SMMU
 struct tegra_smmu *tegra_smmu_probe(struct device *dev,
···
 
 static inline void tegra_smmu_remove(struct tegra_smmu *smmu)
 {
-}
-#endif
-
-#ifdef CONFIG_TEGRA_IOMMU_GART
-struct gart_device *tegra_gart_probe(struct device *dev, struct tegra_mc *mc);
-int tegra_gart_suspend(struct gart_device *gart);
-int tegra_gart_resume(struct gart_device *gart);
-#else
-static inline struct gart_device *
-tegra_gart_probe(struct device *dev, struct tegra_mc *mc)
-{
-	return ERR_PTR(-ENODEV);
-}
-
-static inline int tegra_gart_suspend(struct gart_device *gart)
-{
-	return -ENODEV;
-}
-
-static inline int tegra_gart_resume(struct gart_device *gart)
-{
-	return -ENODEV;
 }
 #endif
 
···
 	 */
 	int (*probe)(struct tegra_mc *mc);
 	void (*remove)(struct tegra_mc *mc);
-	int (*suspend)(struct tegra_mc *mc);
-	int (*resume)(struct tegra_mc *mc);
 	irqreturn_t (*handle_irq)(int irq, void *data);
 	int (*probe_device)(struct tegra_mc *mc, struct device *dev);
 };
···
 	struct tegra_bpmp *bpmp;
 	struct device *dev;
 	struct tegra_smmu *smmu;
-	struct gart_device *gart;
 	void __iomem *regs;
 	void __iomem *bcast_ch_regs;
 	void __iomem **ch_regs;