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Linux/arch/powerpc/include/asm/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 #include <asm/pci-bridge.h>
 33 
 34 #define IOMMU_PAGE_SHIFT_4K      12
 35 #define IOMMU_PAGE_SIZE_4K       (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K)
 36 #define IOMMU_PAGE_MASK_4K       (~((1 << IOMMU_PAGE_SHIFT_4K) - 1))
 37 #define IOMMU_PAGE_ALIGN_4K(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE_4K)
 38 
 39 #define IOMMU_PAGE_SIZE(tblptr) (ASM_CONST(1) << (tblptr)->it_page_shift)
 40 #define IOMMU_PAGE_MASK(tblptr) (~((1 << (tblptr)->it_page_shift) - 1))
 41 #define IOMMU_PAGE_ALIGN(addr, tblptr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE(tblptr))
 42 
 43 /* Boot time flags */
 44 extern int iommu_is_off;
 45 extern int iommu_force_on;
 46 
 47 struct iommu_table_ops {
 48         /*
 49          * When called with direction==DMA_NONE, it is equal to clear().
 50          * uaddr is a linear map address.
 51          */
 52         int (*set)(struct iommu_table *tbl,
 53                         long index, long npages,
 54                         unsigned long uaddr,
 55                         enum dma_data_direction direction,
 56                         struct dma_attrs *attrs);
 57 #ifdef CONFIG_IOMMU_API
 58         /*
 59          * Exchanges existing TCE with new TCE plus direction bits;
 60          * returns old TCE and DMA direction mask.
 61          * @tce is a physical address.
 62          */
 63         int (*exchange)(struct iommu_table *tbl,
 64                         long index,
 65                         unsigned long *hpa,
 66                         enum dma_data_direction *direction);
 67 #endif
 68         void (*clear)(struct iommu_table *tbl,
 69                         long index, long npages);
 70         /* get() returns a physical address */
 71         unsigned long (*get)(struct iommu_table *tbl, long index);
 72         void (*flush)(struct iommu_table *tbl);
 73         void (*free)(struct iommu_table *tbl);
 74 };
 75 
 76 /* These are used by VIO */
 77 extern struct iommu_table_ops iommu_table_lpar_multi_ops;
 78 extern struct iommu_table_ops iommu_table_pseries_ops;
 79 
 80 /*
 81  * IOMAP_MAX_ORDER defines the largest contiguous block
 82  * of dma space we can get.  IOMAP_MAX_ORDER = 13
 83  * allows up to 2**12 pages (4096 * 4096) = 16 MB
 84  */
 85 #define IOMAP_MAX_ORDER         13
 86 
 87 #define IOMMU_POOL_HASHBITS     2
 88 #define IOMMU_NR_POOLS          (1 << IOMMU_POOL_HASHBITS)
 89 
 90 struct iommu_pool {
 91         unsigned long start;
 92         unsigned long end;
 93         unsigned long hint;
 94         spinlock_t lock;
 95 } ____cacheline_aligned_in_smp;
 96 
 97 struct iommu_table {
 98         unsigned long  it_busno;     /* Bus number this table belongs to */
 99         unsigned long  it_size;      /* Size of iommu table in entries */
100         unsigned long  it_indirect_levels;
101         unsigned long  it_level_size;
102         unsigned long  it_allocated_size;
103         unsigned long  it_offset;    /* Offset into global table */
104         unsigned long  it_base;      /* mapped address of tce table */
105         unsigned long  it_index;     /* which iommu table this is */
106         unsigned long  it_type;      /* type: PCI or Virtual Bus */
107         unsigned long  it_blocksize; /* Entries in each block (cacheline) */
108         unsigned long  poolsize;
109         unsigned long  nr_pools;
110         struct iommu_pool large_pool;
111         struct iommu_pool pools[IOMMU_NR_POOLS];
112         unsigned long *it_map;       /* A simple allocation bitmap for now */
113         unsigned long  it_page_shift;/* table iommu page size */
114         struct list_head it_group_list;/* List of iommu_table_group_link */
115         unsigned long *it_userspace; /* userspace view of the table */
116         struct iommu_table_ops *it_ops;
117 };
118 
119 #define IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry) \
120                 ((tbl)->it_userspace ? \
121                         &((tbl)->it_userspace[(entry) - (tbl)->it_offset]) : \
122                         NULL)
123 
124 /* Pure 2^n version of get_order */
125 static inline __attribute_const__
126 int get_iommu_order(unsigned long size, struct iommu_table *tbl)
127 {
128         return __ilog2((size - 1) >> tbl->it_page_shift) + 1;
129 }
130 
131 
132 struct scatterlist;
133 
134 #ifdef CONFIG_PPC64
135 
136 static inline void set_iommu_table_base(struct device *dev,
137                                         struct iommu_table *base)
138 {
139         dev->archdata.iommu_table_base = base;
140 }
141 
142 static inline void *get_iommu_table_base(struct device *dev)
143 {
144         return dev->archdata.iommu_table_base;
145 }
146 
147 extern int dma_iommu_dma_supported(struct device *dev, u64 mask);
148 
149 /* Frees table for an individual device node */
150 extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
151 
152 /* Initializes an iommu_table based in values set in the passed-in
153  * structure
154  */
155 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
156                                             int nid);
157 #define IOMMU_TABLE_GROUP_MAX_TABLES    2
158 
159 struct iommu_table_group;
160 
161 struct iommu_table_group_ops {
162         unsigned long (*get_table_size)(
163                         __u32 page_shift,
164                         __u64 window_size,
165                         __u32 levels);
166         long (*create_table)(struct iommu_table_group *table_group,
167                         int num,
168                         __u32 page_shift,
169                         __u64 window_size,
170                         __u32 levels,
171                         struct iommu_table **ptbl);
172         long (*set_window)(struct iommu_table_group *table_group,
173                         int num,
174                         struct iommu_table *tblnew);
175         long (*unset_window)(struct iommu_table_group *table_group,
176                         int num);
177         /* Switch ownership from platform code to external user (e.g. VFIO) */
178         void (*take_ownership)(struct iommu_table_group *table_group);
179         /* Switch ownership from external user (e.g. VFIO) back to core */
180         void (*release_ownership)(struct iommu_table_group *table_group);
181 };
182 
183 struct iommu_table_group_link {
184         struct list_head next;
185         struct rcu_head rcu;
186         struct iommu_table_group *table_group;
187 };
188 
189 struct iommu_table_group {
190         /* IOMMU properties */
191         __u32 tce32_start;
192         __u32 tce32_size;
193         __u64 pgsizes; /* Bitmap of supported page sizes */
194         __u32 max_dynamic_windows_supported;
195         __u32 max_levels;
196 
197         struct iommu_group *group;
198         struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES];
199         struct iommu_table_group_ops *ops;
200 };
201 
202 #ifdef CONFIG_IOMMU_API
203 
204 extern void iommu_register_group(struct iommu_table_group *table_group,
205                                  int pci_domain_number, unsigned long pe_num);
206 extern int iommu_add_device(struct device *dev);
207 extern void iommu_del_device(struct device *dev);
208 extern int __init tce_iommu_bus_notifier_init(void);
209 extern long iommu_tce_xchg(struct iommu_table *tbl, unsigned long entry,
210                 unsigned long *hpa, enum dma_data_direction *direction);
211 #else
212 static inline void iommu_register_group(struct iommu_table_group *table_group,
213                                         int pci_domain_number,
214                                         unsigned long pe_num)
215 {
216 }
217 
218 static inline int iommu_add_device(struct device *dev)
219 {
220         return 0;
221 }
222 
223 static inline void iommu_del_device(struct device *dev)
224 {
225 }
226 
227 static inline int __init tce_iommu_bus_notifier_init(void)
228 {
229         return 0;
230 }
231 #endif /* !CONFIG_IOMMU_API */
232 
233 #else
234 
235 static inline void *get_iommu_table_base(struct device *dev)
236 {
237         return NULL;
238 }
239 
240 static inline int dma_iommu_dma_supported(struct device *dev, u64 mask)
241 {
242         return 0;
243 }
244 
245 #endif /* CONFIG_PPC64 */
246 
247 extern int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
248                             struct scatterlist *sglist, int nelems,
249                             unsigned long mask,
250                             enum dma_data_direction direction,
251                             struct dma_attrs *attrs);
252 extern void ppc_iommu_unmap_sg(struct iommu_table *tbl,
253                                struct scatterlist *sglist,
254                                int nelems,
255                                enum dma_data_direction direction,
256                                struct dma_attrs *attrs);
257 
258 extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
259                                   size_t size, dma_addr_t *dma_handle,
260                                   unsigned long mask, gfp_t flag, int node);
261 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
262                                 void *vaddr, dma_addr_t dma_handle);
263 extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
264                                  struct page *page, unsigned long offset,
265                                  size_t size, unsigned long mask,
266                                  enum dma_data_direction direction,
267                                  struct dma_attrs *attrs);
268 extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
269                              size_t size, enum dma_data_direction direction,
270                              struct dma_attrs *attrs);
271 
272 extern void iommu_init_early_pSeries(void);
273 extern void iommu_init_early_dart(struct pci_controller_ops *controller_ops);
274 extern void iommu_init_early_pasemi(void);
275 
276 extern void alloc_dart_table(void);
277 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
278 static inline void iommu_save(void)
279 {
280         if (ppc_md.iommu_save)
281                 ppc_md.iommu_save();
282 }
283 
284 static inline void iommu_restore(void)
285 {
286         if (ppc_md.iommu_restore)
287                 ppc_md.iommu_restore();
288 }
289 #endif
290 
291 /* The API to support IOMMU operations for VFIO */
292 extern int iommu_tce_clear_param_check(struct iommu_table *tbl,
293                 unsigned long ioba, unsigned long tce_value,
294                 unsigned long npages);
295 extern int iommu_tce_put_param_check(struct iommu_table *tbl,
296                 unsigned long ioba, unsigned long tce);
297 
298 extern void iommu_flush_tce(struct iommu_table *tbl);
299 extern int iommu_take_ownership(struct iommu_table *tbl);
300 extern void iommu_release_ownership(struct iommu_table *tbl);
301 
302 extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
303 extern unsigned long iommu_direction_to_tce_perm(enum dma_data_direction dir);
304 
305 #endif /* __KERNEL__ */
306 #endif /* _ASM_IOMMU_H */
307 

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