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)
39 extern int iommu_is_off;
40 extern int iommu_force_on;
42 /* Pure 2^n version of get_order */
43 static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
45 return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT_4K) + 1;
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
54 #define IOMAP_MAX_ORDER 13
56 #define IOMMU_POOL_HASHBITS 2
57 #define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS)
64 } ____cacheline_aligned_in_smp;
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 unsigned long it_page_shift;/* table iommu page size */
80 #ifdef CONFIG_IOMMU_API
81 struct iommu_group *it_group;
87 static inline void set_iommu_table_base(struct device *dev, void *base)
89 dev->archdata.dma_data.iommu_table_base = base;
92 static inline void *get_iommu_table_base(struct device *dev)
94 return dev->archdata.dma_data.iommu_table_base;
97 /* Frees table for an individual device node */
98 extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
100 /* Initializes an iommu_table based in values set in the passed-in
103 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
105 #ifdef CONFIG_IOMMU_API
106 extern void iommu_register_group(struct iommu_table *tbl,
107 int pci_domain_number, unsigned long pe_num);
108 extern int iommu_add_device(struct device *dev);
109 extern void iommu_del_device(struct device *dev);
111 static inline void iommu_register_group(struct iommu_table *tbl,
112 int pci_domain_number,
113 unsigned long pe_num)
117 static inline int iommu_add_device(struct device *dev)
122 static inline void iommu_del_device(struct device *dev)
125 #endif /* !CONFIG_IOMMU_API */
127 static inline void set_iommu_table_base_and_group(struct device *dev,
130 set_iommu_table_base(dev, base);
131 iommu_add_device(dev);
134 extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
135 struct scatterlist *sglist, int nelems,
136 unsigned long mask, enum dma_data_direction direction,
137 struct dma_attrs *attrs);
138 extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
139 int nelems, enum dma_data_direction direction,
140 struct dma_attrs *attrs);
142 extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
143 size_t size, dma_addr_t *dma_handle,
144 unsigned long mask, gfp_t flag, int node);
145 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
146 void *vaddr, dma_addr_t dma_handle);
147 extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
148 struct page *page, unsigned long offset,
149 size_t size, unsigned long mask,
150 enum dma_data_direction direction,
151 struct dma_attrs *attrs);
152 extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
153 size_t size, enum dma_data_direction direction,
154 struct dma_attrs *attrs);
156 extern void iommu_init_early_pSeries(void);
157 extern void iommu_init_early_dart(void);
158 extern void iommu_init_early_pasemi(void);
160 extern void alloc_dart_table(void);
161 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
162 static inline void iommu_save(void)
164 if (ppc_md.iommu_save)
168 static inline void iommu_restore(void)
170 if (ppc_md.iommu_restore)
171 ppc_md.iommu_restore();
175 /* The API to support IOMMU operations for VFIO */
176 extern int iommu_tce_clear_param_check(struct iommu_table *tbl,
177 unsigned long ioba, unsigned long tce_value,
178 unsigned long npages);
179 extern int iommu_tce_put_param_check(struct iommu_table *tbl,
180 unsigned long ioba, unsigned long tce);
181 extern int iommu_tce_build(struct iommu_table *tbl, unsigned long entry,
182 unsigned long hwaddr, enum dma_data_direction direction);
183 extern unsigned long iommu_clear_tce(struct iommu_table *tbl,
184 unsigned long entry);
185 extern int iommu_clear_tces_and_put_pages(struct iommu_table *tbl,
186 unsigned long entry, unsigned long pages);
187 extern int iommu_put_tce_user_mode(struct iommu_table *tbl,
188 unsigned long entry, unsigned long tce);
190 extern void iommu_flush_tce(struct iommu_table *tbl);
191 extern int iommu_take_ownership(struct iommu_table *tbl);
192 extern void iommu_release_ownership(struct iommu_table *tbl);
194 extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
196 #endif /* __KERNEL__ */
197 #endif /* _ASM_IOMMU_H */