arch/powerpc/include/asm/iommu.h

   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                         unsigned long 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                             unsigned long 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                                unsigned long 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                                  unsigned long 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                              unsigned long 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 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
 277 static inline void iommu_save(void)
 278 {
 279         if (ppc_md.iommu_save)
 280                 ppc_md.iommu_save();
 281 }
 282
 283 static inline void iommu_restore(void)
 284 {
 285         if (ppc_md.iommu_restore)
 286                 ppc_md.iommu_restore();
 287 }
 288 #endif
 289
 290 /* The API to support IOMMU operations for VFIO */
 291 extern int iommu_tce_clear_param_check(struct iommu_table *tbl,
 292                 unsigned long ioba, unsigned long tce_value,
 293                 unsigned long npages);
 294 extern int iommu_tce_put_param_check(struct iommu_table *tbl,
 295                 unsigned long ioba, unsigned long tce);
 296
 297 extern void iommu_flush_tce(struct iommu_table *tbl);
 298 extern int iommu_take_ownership(struct iommu_table *tbl);
 299 extern void iommu_release_ownership(struct iommu_table *tbl);
 300
 301 extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
 302 extern unsigned long iommu_direction_to_tce_perm(enum dma_data_direction dir);
 303
 304 #endif /* __KERNEL__ */
 305 #endif /* _ASM_IOMMU_H */