tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
3 * Rewrite, cleanup:
4 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#ifndef _ASM_IOMMU_H
22#define _ASM_IOMMU_H
23#ifdef __KERNEL__
24
25#include <linux/compiler.h>
26#include <linux/spinlock.h>
27#include <linux/device.h>
28#include <linux/dma-mapping.h>
29#include <asm/types.h>
30#include <asm/bitops.h>
31
32#define IOMMU_PAGE_SHIFT 12
33#define IOMMU_PAGE_SIZE (ASM_CONST(1) << IOMMU_PAGE_SHIFT)
34#define IOMMU_PAGE_MASK (~((1 << IOMMU_PAGE_SHIFT) - 1))
35#define IOMMU_PAGE_ALIGN(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE)
36
37/* Boot time flags */
38extern int iommu_is_off;
39extern int iommu_force_on;
40
41/* Pure 2^n version of get_order */
42static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
43{
44 return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT) + 1;
45}
46
47
48/*
49 * IOMAP_MAX_ORDER defines the largest contiguous block
50 * of dma space we can get. IOMAP_MAX_ORDER = 13
51 * allows up to 2**12 pages (4096 * 4096) = 16 MB
52 */
53#define IOMAP_MAX_ORDER 13
54
55struct iommu_table {
56 unsigned long it_busno; /* Bus number this table belongs to */
57 unsigned long it_size; /* Size of iommu table in entries */
58 unsigned long it_offset; /* Offset into global table */
59 unsigned long it_base; /* mapped address of tce table */
60 unsigned long it_index; /* which iommu table this is */
61 unsigned long it_type; /* type: PCI or Virtual Bus */
62 unsigned long it_blocksize; /* Entries in each block (cacheline) */
63 unsigned long it_hint; /* Hint for next alloc */
64 unsigned long it_largehint; /* Hint for large allocs */
65 unsigned long it_halfpoint; /* Breaking point for small/large allocs */
66 spinlock_t it_lock; /* Protects it_map */
67 unsigned long *it_map; /* A simple allocation bitmap for now */
68};
69
70struct scatterlist;
71struct device_node;
72
73/* Frees table for an individual device node */
74extern void iommu_free_table(struct device_node *dn);
75
76/* Initializes an iommu_table based in values set in the passed-in
77 * structure
78 */
79extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
80 int nid);
81
82extern int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
83 int nelems, unsigned long mask,
84 enum dma_data_direction direction);
85extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
86 int nelems, enum dma_data_direction direction);
87
88extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
89 dma_addr_t *dma_handle, unsigned long mask,
90 gfp_t flag, int node);
91extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
92 void *vaddr, dma_addr_t dma_handle);
93extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr,
94 size_t size, unsigned long mask,
95 enum dma_data_direction direction);
96extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
97 size_t size, enum dma_data_direction direction);
98
99extern void iommu_init_early_pSeries(void);
100extern void iommu_init_early_iSeries(void);
101extern void iommu_init_early_dart(void);
102extern void iommu_init_early_pasemi(void);
103
104#ifdef CONFIG_PCI
105extern void pci_iommu_init(void);
106extern void pci_direct_iommu_init(void);
107#else
108static inline void pci_iommu_init(void) { }
109#endif
110
111extern void alloc_dart_table(void);
112
113#endif /* __KERNEL__ */
114#endif /* _ASM_IOMMU_H */