arch/x86/include/asm/dma-mapping.h

   1 #ifndef _ASM_X86_DMA_MAPPING_H
   2 #define _ASM_X86_DMA_MAPPING_H
   3
   4 /*
   5  * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
   6  * documentation.
   7  */
   8
   9 #include <linux/scatterlist.h>
  10 #include <linux/dma-attrs.h>
  11 #include <asm/io.h>
  12 #include <asm/swiotlb.h>
  13 #include <asm-generic/dma-coherent.h>
  14
  15 extern dma_addr_t bad_dma_address;
  16 extern int iommu_merge;
  17 extern struct device x86_dma_fallback_dev;
  18 extern int panic_on_overflow;
  19
  20 struct dma_mapping_ops {
  21         int             (*mapping_error)(struct device *dev,
  22                                          dma_addr_t dma_addr);
  23         void*           (*alloc_coherent)(struct device *dev, size_t size,
  24                                 dma_addr_t *dma_handle, gfp_t gfp);
  25         void            (*free_coherent)(struct device *dev, size_t size,
  26                                 void *vaddr, dma_addr_t dma_handle);
  27         void            (*sync_single_for_cpu)(struct device *hwdev,
  28                                 dma_addr_t dma_handle, size_t size,
  29                                 int direction);
  30         void            (*sync_single_for_device)(struct device *hwdev,
  31                                 dma_addr_t dma_handle, size_t size,
  32                                 int direction);
  33         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  34                                 dma_addr_t dma_handle, unsigned long offset,
  35                                 size_t size, int direction);
  36         void            (*sync_single_range_for_device)(struct device *hwdev,
  37                                 dma_addr_t dma_handle, unsigned long offset,
  38                                 size_t size, int direction);
  39         void            (*sync_sg_for_cpu)(struct device *hwdev,
  40                                 struct scatterlist *sg, int nelems,
  41                                 int direction);
  42         void            (*sync_sg_for_device)(struct device *hwdev,
  43                                 struct scatterlist *sg, int nelems,
  44                                 int direction);
  45         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  46                                 int nents, int direction);
  47         void            (*unmap_sg)(struct device *hwdev,
  48                                 struct scatterlist *sg, int nents,
  49                                 int direction);
  50         dma_addr_t      (*map_page)(struct device *dev, struct page *page,
  51                                     unsigned long offset, size_t size,
  52                                     enum dma_data_direction dir,
  53                                     struct dma_attrs *attrs);
  54         void            (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
  55                                       size_t size, enum dma_data_direction dir,
  56                                       struct dma_attrs *attrs);
  57         int             (*dma_supported)(struct device *hwdev, u64 mask);
  58         int             is_phys;
  59 };
  60
  61 extern struct dma_mapping_ops *dma_ops;
  62
  63 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
  64 {
  65 #ifdef CONFIG_X86_32
  66         return dma_ops;
  67 #else
  68         if (unlikely(!dev) || !dev->archdata.dma_ops)
  69                 return dma_ops;
  70         else
  71                 return dev->archdata.dma_ops;
  72 #endif
  73 }
  74
  75 /* Make sure we keep the same behaviour */
  76 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  77 {
  78         struct dma_mapping_ops *ops = get_dma_ops(dev);
  79         if (ops->mapping_error)
  80                 return ops->mapping_error(dev, dma_addr);
  81
  82         return (dma_addr == bad_dma_address);
  83 }
  84
  85 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  86 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  87 #define dma_is_consistent(d, h) (1)
  88
  89 extern int dma_supported(struct device *hwdev, u64 mask);
  90 extern int dma_set_mask(struct device *dev, u64 mask);
  91
  92 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
  93                                         dma_addr_t *dma_addr, gfp_t flag);
  94
  95 static inline dma_addr_t
  96 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  97                int direction)
  98 {
  99         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 100
 101         BUG_ON(!valid_dma_direction(direction));
 102         return ops->map_page(hwdev, virt_to_page(ptr),
 103                              (unsigned long)ptr & ~PAGE_MASK, size,
 104                              direction, NULL);
 105 }
 106
 107 static inline void
 108 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
 109                  int direction)
 110 {
 111         struct dma_mapping_ops *ops = get_dma_ops(dev);
 112
 113         BUG_ON(!valid_dma_direction(direction));
 114         if (ops->unmap_page)
 115                 ops->unmap_page(dev, addr, size, direction, NULL);
 116 }
 117
 118 static inline int
 119 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 120            int nents, int direction)
 121 {
 122         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 123
 124         BUG_ON(!valid_dma_direction(direction));
 125         return ops->map_sg(hwdev, sg, nents, direction);
 126 }
 127
 128 static inline void
 129 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 130              int direction)
 131 {
 132         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 133
 134         BUG_ON(!valid_dma_direction(direction));
 135         if (ops->unmap_sg)
 136                 ops->unmap_sg(hwdev, sg, nents, direction);
 137 }
 138
 139 static inline void
 140 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 141                         size_t size, int direction)
 142 {
 143         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 144
 145         BUG_ON(!valid_dma_direction(direction));
 146         if (ops->sync_single_for_cpu)
 147                 ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
 148         flush_write_buffers();
 149 }
 150
 151 static inline void
 152 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 153                            size_t size, int direction)
 154 {
 155         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 156
 157         BUG_ON(!valid_dma_direction(direction));
 158         if (ops->sync_single_for_device)
 159                 ops->sync_single_for_device(hwdev, dma_handle, size, direction);
 160         flush_write_buffers();
 161 }
 162
 163 static inline void
 164 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 165                               unsigned long offset, size_t size, int direction)
 166 {
 167         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 168
 169         BUG_ON(!valid_dma_direction(direction));
 170         if (ops->sync_single_range_for_cpu)
 171                 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 172                                                size, direction);
 173         flush_write_buffers();
 174 }
 175
 176 static inline void
 177 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 178                                  unsigned long offset, size_t size,
 179                                  int direction)
 180 {
 181         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 182
 183         BUG_ON(!valid_dma_direction(direction));
 184         if (ops->sync_single_range_for_device)
 185                 ops->sync_single_range_for_device(hwdev, dma_handle,
 186                                                   offset, size, direction);
 187         flush_write_buffers();
 188 }
 189
 190 static inline void
 191 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 192                     int nelems, int direction)
 193 {
 194         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 195
 196         BUG_ON(!valid_dma_direction(direction));
 197         if (ops->sync_sg_for_cpu)
 198                 ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 199         flush_write_buffers();
 200 }
 201
 202 static inline void
 203 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 204                        int nelems, int direction)
 205 {
 206         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 207
 208         BUG_ON(!valid_dma_direction(direction));
 209         if (ops->sync_sg_for_device)
 210                 ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 211
 212         flush_write_buffers();
 213 }
 214
 215 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 216                                       size_t offset, size_t size,
 217                                       int direction)
 218 {
 219         struct dma_mapping_ops *ops = get_dma_ops(dev);
 220
 221         BUG_ON(!valid_dma_direction(direction));
 222         return ops->map_page(dev, page, offset, size, direction, NULL);
 223 }
 224
 225 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 226                                   size_t size, int direction)
 227 {
 228         dma_unmap_single(dev, addr, size, direction);
 229 }
 230
 231 static inline void
 232 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 233         enum dma_data_direction dir)
 234 {
 235         flush_write_buffers();
 236 }
 237
 238 static inline int dma_get_cache_alignment(void)
 239 {
 240         /* no easy way to get cache size on all x86, so return the
 241          * maximum possible, to be safe */
 242         return boot_cpu_data.x86_clflush_size;
 243 }
 244
 245 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
 246                                                     gfp_t gfp)
 247 {
 248         unsigned long dma_mask = 0;
 249
 250         dma_mask = dev->coherent_dma_mask;
 251         if (!dma_mask)
 252                 dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK;
 253
 254         return dma_mask;
 255 }
 256
 257 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
 258 {
 259         unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
 260
 261         if (dma_mask <= DMA_24BIT_MASK)
 262                 gfp |= GFP_DMA;
 263 #ifdef CONFIG_X86_64
 264         if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
 265                 gfp |= GFP_DMA32;
 266 #endif
 267        return gfp;
 268 }
 269
 270 static inline void *
 271 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 272                 gfp_t gfp)
 273 {
 274         struct dma_mapping_ops *ops = get_dma_ops(dev);
 275         void *memory;
 276
 277         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 278
 279         if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
 280                 return memory;
 281
 282         if (!dev) {
 283                 dev = &x86_dma_fallback_dev;
 284                 gfp |= GFP_DMA;
 285         }
 286
 287         if (!is_device_dma_capable(dev))
 288                 return NULL;
 289
 290         if (!ops->alloc_coherent)
 291                 return NULL;
 292
 293         return ops->alloc_coherent(dev, size, dma_handle,
 294                                    dma_alloc_coherent_gfp_flags(dev, gfp));
 295 }
 296
 297 static inline void dma_free_coherent(struct device *dev, size_t size,
 298                                      void *vaddr, dma_addr_t bus)
 299 {
 300         struct dma_mapping_ops *ops = get_dma_ops(dev);
 301
 302         WARN_ON(irqs_disabled());       /* for portability */
 303
 304         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 305                 return;
 306
 307         if (ops->free_coherent)
 308                 ops->free_coherent(dev, size, vaddr, bus);
 309 }
 310
 311 #endif