2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
4 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
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.
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.
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
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>
33 #define IOMMU_PAGE_SHIFT_4K 12
34 #define IOMMU_PAGE_SIZE_4K (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K)
35 #define IOMMU_PAGE_MASK_4K (~((1 << IOMMU_PAGE_SHIFT_4K) - 1))
36 #define IOMMU_PAGE_ALIGN_4K(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE_4K)
38 #define IOMMU_PAGE_SIZE(tblptr) (ASM_CONST(1) << (tblptr)->it_page_shift)
39 #define IOMMU_PAGE_MASK(tblptr) (~((1 << (tblptr)->it_page_shift) - 1))
40 #define IOMMU_PAGE_ALIGN(addr, tblptr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE(tblptr))
43 extern int iommu_is_off
;
44 extern int iommu_force_on
;
47 * IOMAP_MAX_ORDER defines the largest contiguous block
48 * of dma space we can get. IOMAP_MAX_ORDER = 13
49 * allows up to 2**12 pages (4096 * 4096) = 16 MB
51 #define IOMAP_MAX_ORDER 13
53 #define IOMMU_POOL_HASHBITS 2
54 #define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS)
61 } ____cacheline_aligned_in_smp
;
64 unsigned long it_busno
; /* Bus number this table belongs to */
65 unsigned long it_size
; /* Size of iommu table in entries */
66 unsigned long it_offset
; /* Offset into global table */
67 unsigned long it_base
; /* mapped address of tce table */
68 unsigned long it_index
; /* which iommu table this is */
69 unsigned long it_type
; /* type: PCI or Virtual Bus */
70 unsigned long it_blocksize
; /* Entries in each block (cacheline) */
71 unsigned long poolsize
;
72 unsigned long nr_pools
;
73 struct iommu_pool large_pool
;
74 struct iommu_pool pools
[IOMMU_NR_POOLS
];
75 unsigned long *it_map
; /* A simple allocation bitmap for now */
76 unsigned long it_page_shift
;/* table iommu page size */
77 #ifdef CONFIG_IOMMU_API
78 struct iommu_group
*it_group
;
80 void (*set_bypass
)(struct iommu_table
*tbl
, bool enable
);
83 /* Pure 2^n version of get_order */
84 static inline __attribute_const__
85 int get_iommu_order(unsigned long size
, struct iommu_table
*tbl
)
87 return __ilog2((size
- 1) >> tbl
->it_page_shift
) + 1;
93 static inline void set_iommu_table_base(struct device
*dev
, void *base
)
95 dev
->archdata
.dma_data
.iommu_table_base
= base
;
98 static inline void *get_iommu_table_base(struct device
*dev
)
100 return dev
->archdata
.dma_data
.iommu_table_base
;
103 /* Frees table for an individual device node */
104 extern void iommu_free_table(struct iommu_table
*tbl
, const char *node_name
);
106 /* Initializes an iommu_table based in values set in the passed-in
109 extern struct iommu_table
*iommu_init_table(struct iommu_table
* tbl
,
111 #ifdef CONFIG_IOMMU_API
112 extern void iommu_register_group(struct iommu_table
*tbl
,
113 int pci_domain_number
, unsigned long pe_num
);
114 extern int iommu_add_device(struct device
*dev
);
115 extern void iommu_del_device(struct device
*dev
);
117 static inline void iommu_register_group(struct iommu_table
*tbl
,
118 int pci_domain_number
,
119 unsigned long pe_num
)
123 static inline int iommu_add_device(struct device
*dev
)
128 static inline void iommu_del_device(struct device
*dev
)
131 #endif /* !CONFIG_IOMMU_API */
133 static inline void set_iommu_table_base_and_group(struct device
*dev
,
136 set_iommu_table_base(dev
, base
);
137 iommu_add_device(dev
);
140 extern int iommu_map_sg(struct device
*dev
, struct iommu_table
*tbl
,
141 struct scatterlist
*sglist
, int nelems
,
142 unsigned long mask
, enum dma_data_direction direction
,
143 struct dma_attrs
*attrs
);
144 extern void iommu_unmap_sg(struct iommu_table
*tbl
, struct scatterlist
*sglist
,
145 int nelems
, enum dma_data_direction direction
,
146 struct dma_attrs
*attrs
);
148 extern void *iommu_alloc_coherent(struct device
*dev
, struct iommu_table
*tbl
,
149 size_t size
, dma_addr_t
*dma_handle
,
150 unsigned long mask
, gfp_t flag
, int node
);
151 extern void iommu_free_coherent(struct iommu_table
*tbl
, size_t size
,
152 void *vaddr
, dma_addr_t dma_handle
);
153 extern dma_addr_t
iommu_map_page(struct device
*dev
, struct iommu_table
*tbl
,
154 struct page
*page
, unsigned long offset
,
155 size_t size
, unsigned long mask
,
156 enum dma_data_direction direction
,
157 struct dma_attrs
*attrs
);
158 extern void iommu_unmap_page(struct iommu_table
*tbl
, dma_addr_t dma_handle
,
159 size_t size
, enum dma_data_direction direction
,
160 struct dma_attrs
*attrs
);
162 extern void iommu_init_early_pSeries(void);
163 extern void iommu_init_early_dart(void);
164 extern void iommu_init_early_pasemi(void);
166 extern void alloc_dart_table(void);
167 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
168 static inline void iommu_save(void)
170 if (ppc_md
.iommu_save
)
174 static inline void iommu_restore(void)
176 if (ppc_md
.iommu_restore
)
177 ppc_md
.iommu_restore();
181 /* The API to support IOMMU operations for VFIO */
182 extern int iommu_tce_clear_param_check(struct iommu_table
*tbl
,
183 unsigned long ioba
, unsigned long tce_value
,
184 unsigned long npages
);
185 extern int iommu_tce_put_param_check(struct iommu_table
*tbl
,
186 unsigned long ioba
, unsigned long tce
);
187 extern int iommu_tce_build(struct iommu_table
*tbl
, unsigned long entry
,
188 unsigned long hwaddr
, enum dma_data_direction direction
);
189 extern unsigned long iommu_clear_tce(struct iommu_table
*tbl
,
190 unsigned long entry
);
191 extern int iommu_clear_tces_and_put_pages(struct iommu_table
*tbl
,
192 unsigned long entry
, unsigned long pages
);
193 extern int iommu_put_tce_user_mode(struct iommu_table
*tbl
,
194 unsigned long entry
, unsigned long tce
);
196 extern void iommu_flush_tce(struct iommu_table
*tbl
);
197 extern int iommu_take_ownership(struct iommu_table
*tbl
);
198 extern void iommu_release_ownership(struct iommu_table
*tbl
);
200 extern enum dma_data_direction
iommu_tce_direction(unsigned long tce
);
202 #endif /* __KERNEL__ */
203 #endif /* _ASM_IOMMU_H */