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iommu.h
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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 <linux/bitops.h>
30 #include <asm/machdep.h>
31 #include <asm/types.h>
32 
33 #define IOMMU_PAGE_SHIFT 12
34 #define IOMMU_PAGE_SIZE (ASM_CONST(1) << IOMMU_PAGE_SHIFT)
35 #define IOMMU_PAGE_MASK (~((1 << IOMMU_PAGE_SHIFT) - 1))
36 #define IOMMU_PAGE_ALIGN(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE)
37 
38 /* Boot time flags */
39 extern int iommu_is_off;
40 extern int iommu_force_on;
41 
42 /* Pure 2^n version of get_order */
43 static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
44 {
45  return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT) + 1;
46 }
47 
48 
49 /*
50  * IOMAP_MAX_ORDER defines the largest contiguous block
51  * of dma space we can get. IOMAP_MAX_ORDER = 13
52  * allows up to 2**12 pages (4096 * 4096) = 16 MB
53  */
54 #define IOMAP_MAX_ORDER 13
55 
56 #define IOMMU_POOL_HASHBITS 2
57 #define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS)
58 
59 struct iommu_pool {
60  unsigned long start;
61  unsigned long end;
62  unsigned long hint;
63  spinlock_t lock;
64 } ____cacheline_aligned_in_smp;
65 
66 struct iommu_table {
67  unsigned long it_busno; /* Bus number this table belongs to */
68  unsigned long it_size; /* Size of iommu table in entries */
69  unsigned long it_offset; /* Offset into global table */
70  unsigned long it_base; /* mapped address of tce table */
71  unsigned long it_index; /* which iommu table this is */
72  unsigned long it_type; /* type: PCI or Virtual Bus */
73  unsigned long it_blocksize; /* Entries in each block (cacheline) */
74  unsigned long poolsize;
75  unsigned long nr_pools;
76  struct iommu_pool large_pool;
77  struct iommu_pool pools[IOMMU_NR_POOLS];
78  unsigned long *it_map; /* A simple allocation bitmap for now */
79 };
80 
81 struct scatterlist;
82 
83 static inline void set_iommu_table_base(struct device *dev, void *base)
84 {
85  dev->archdata.dma_data.iommu_table_base = base;
86 }
87 
88 static inline void *get_iommu_table_base(struct device *dev)
89 {
90  return dev->archdata.dma_data.iommu_table_base;
91 }
92 
93 /* Frees table for an individual device node */
94 extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
95 
96 /* Initializes an iommu_table based in values set in the passed-in
97  * structure
98  */
99 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
100  int nid);
101 
102 extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
103  struct scatterlist *sglist, int nelems,
104  unsigned long mask, enum dma_data_direction direction,
105  struct dma_attrs *attrs);
106 extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
107  int nelems, enum dma_data_direction direction,
108  struct dma_attrs *attrs);
109 
110 extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
111  size_t size, dma_addr_t *dma_handle,
112  unsigned long mask, gfp_t flag, int node);
113 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
114  void *vaddr, dma_addr_t dma_handle);
115 extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
116  struct page *page, unsigned long offset,
117  size_t size, unsigned long mask,
118  enum dma_data_direction direction,
119  struct dma_attrs *attrs);
120 extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
121  size_t size, enum dma_data_direction direction,
122  struct dma_attrs *attrs);
123 
124 extern void iommu_init_early_pSeries(void);
125 extern void iommu_init_early_dart(void);
126 extern void iommu_init_early_pasemi(void);
127 
128 #ifdef CONFIG_PCI
129 extern void pci_iommu_init(void);
130 extern void pci_direct_iommu_init(void);
131 #else
132 static inline void pci_iommu_init(void) { }
133 #endif
134 
135 extern void alloc_dart_table(void);
136 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
137 static inline void iommu_save(void)
138 {
139  if (ppc_md.iommu_save)
140  ppc_md.iommu_save();
141 }
142 
143 static inline void iommu_restore(void)
144 {
145  if (ppc_md.iommu_restore)
146  ppc_md.iommu_restore();
147 }
148 #endif
149 
150 #endif /* __KERNEL__ */
151 #endif /* _ASM_IOMMU_H */
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