git.oblomov.eu Git - linux-2.6/blob - include/asm-x86/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 <asm/io.h>
  11 #include <asm/swiotlb.h>
  12 #include <asm-generic/dma-coherent.h>
  13
  14 extern dma_addr_t bad_dma_address;
  15 extern int iommu_merge;
  16 extern struct device x86_dma_fallback_dev;
  17 extern int panic_on_overflow;
  18
  19 struct dma_mapping_ops {
  20         int             (*mapping_error)(struct device *dev,
  21                                          dma_addr_t dma_addr);
  22         void*           (*alloc_coherent)(struct device *dev, size_t size,
  23                                 dma_addr_t *dma_handle, gfp_t gfp);
  24         void            (*free_coherent)(struct device *dev, size_t size,
  25                                 void *vaddr, dma_addr_t dma_handle);
  26         dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
  27                                 size_t size, int direction);
  28         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  29                                 size_t size, int direction);
  30         void            (*sync_single_for_cpu)(struct device *hwdev,
  31                                 dma_addr_t dma_handle, size_t size,
  32                                 int direction);
  33         void            (*sync_single_for_device)(struct device *hwdev,
  34                                 dma_addr_t dma_handle, size_t size,
  35                                 int direction);
  36         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  37                                 dma_addr_t dma_handle, unsigned long offset,
  38                                 size_t size, int direction);
  39         void            (*sync_single_range_for_device)(struct device *hwdev,
  40                                 dma_addr_t dma_handle, unsigned long offset,
  41                                 size_t size, int direction);
  42         void            (*sync_sg_for_cpu)(struct device *hwdev,
  43                                 struct scatterlist *sg, int nelems,
  44                                 int direction);
  45         void            (*sync_sg_for_device)(struct device *hwdev,
  46                                 struct scatterlist *sg, int nelems,
  47                                 int direction);
  48         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  49                                 int nents, int direction);
  50         void            (*unmap_sg)(struct device *hwdev,
  51                                 struct scatterlist *sg, int nents,
  52                                 int direction);
  53         int             (*dma_supported)(struct device *hwdev, u64 mask);
  54         int             is_phys;
  55 };
  56
  57 extern struct dma_mapping_ops *dma_ops;
  58
  59 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
  60 {
  61 #ifdef CONFIG_X86_32
  62         return dma_ops;
  63 #else
  64         if (unlikely(!dev) || !dev->archdata.dma_ops)
  65                 return dma_ops;
  66         else
  67                 return dev->archdata.dma_ops;
  68 #endif /* ASM_X86__DMA_MAPPING_H */
  69 }
  70
  71 /* Make sure we keep the same behaviour */
  72 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  73 {
  74 #ifdef CONFIG_X86_32
  75         return 0;
  76 #else
  77         struct dma_mapping_ops *ops = get_dma_ops(dev);
  78         if (ops->mapping_error)
  79                 return ops->mapping_error(dev, dma_addr);
  80
  81         return (dma_addr == bad_dma_address);
  82 #endif
  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_single(hwdev, virt_to_phys(ptr), size, direction);
 103 }
 104
 105 static inline void
 106 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
 107                  int direction)
 108 {
 109         struct dma_mapping_ops *ops = get_dma_ops(dev);
 110
 111         BUG_ON(!valid_dma_direction(direction));
 112         if (ops->unmap_single)
 113                 ops->unmap_single(dev, addr, size, direction);
 114 }
 115
 116 static inline int
 117 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 118            int nents, int direction)
 119 {
 120         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 121
 122         BUG_ON(!valid_dma_direction(direction));
 123         return ops->map_sg(hwdev, sg, nents, direction);
 124 }
 125
 126 static inline void
 127 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 128              int direction)
 129 {
 130         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 131
 132         BUG_ON(!valid_dma_direction(direction));
 133         if (ops->unmap_sg)
 134                 ops->unmap_sg(hwdev, sg, nents, direction);
 135 }
 136
 137 static inline void
 138 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 139                         size_t size, int direction)
 140 {
 141         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 142
 143         BUG_ON(!valid_dma_direction(direction));
 144         if (ops->sync_single_for_cpu)
 145                 ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
 146         flush_write_buffers();
 147 }
 148
 149 static inline void
 150 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 151                            size_t size, int direction)
 152 {
 153         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 154
 155         BUG_ON(!valid_dma_direction(direction));
 156         if (ops->sync_single_for_device)
 157                 ops->sync_single_for_device(hwdev, dma_handle, size, direction);
 158         flush_write_buffers();
 159 }
 160
 161 static inline void
 162 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 163                               unsigned long offset, size_t size, int direction)
 164 {
 165         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 166
 167         BUG_ON(!valid_dma_direction(direction));
 168         if (ops->sync_single_range_for_cpu)
 169                 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 170                                                size, direction);
 171         flush_write_buffers();
 172 }
 173
 174 static inline void
 175 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 176                                  unsigned long offset, size_t size,
 177                                  int direction)
 178 {
 179         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 180
 181         BUG_ON(!valid_dma_direction(direction));
 182         if (ops->sync_single_range_for_device)
 183                 ops->sync_single_range_for_device(hwdev, dma_handle,
 184                                                   offset, size, direction);
 185         flush_write_buffers();
 186 }
 187
 188 static inline void
 189 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 190                     int nelems, int direction)
 191 {
 192         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 193
 194         BUG_ON(!valid_dma_direction(direction));
 195         if (ops->sync_sg_for_cpu)
 196                 ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 197         flush_write_buffers();
 198 }
 199
 200 static inline void
 201 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 202                        int nelems, int direction)
 203 {
 204         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 205
 206         BUG_ON(!valid_dma_direction(direction));
 207         if (ops->sync_sg_for_device)
 208                 ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 209
 210         flush_write_buffers();
 211 }
 212
 213 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 214                                       size_t offset, size_t size,
 215                                       int direction)
 216 {
 217         struct dma_mapping_ops *ops = get_dma_ops(dev);
 218
 219         BUG_ON(!valid_dma_direction(direction));
 220         return ops->map_single(dev, page_to_phys(page) + offset,
 221                                size, direction);
 222 }
 223
 224 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 225                                   size_t size, int direction)
 226 {
 227         dma_unmap_single(dev, addr, size, direction);
 228 }
 229
 230 static inline void
 231 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 232         enum dma_data_direction dir)
 233 {
 234         flush_write_buffers();
 235 }
 236
 237 static inline int dma_get_cache_alignment(void)
 238 {
 239         /* no easy way to get cache size on all x86, so return the
 240          * maximum possible, to be safe */
 241         return boot_cpu_data.x86_clflush_size;
 242 }
 243
 244 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
 245                                                     gfp_t gfp)
 246 {
 247         unsigned long dma_mask = 0;
 248
 249         dma_mask = dev->coherent_dma_mask;
 250         if (!dma_mask)
 251                 dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK;
 252
 253         return dma_mask;
 254 }
 255
 256 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
 257 {
 258 #ifdef CONFIG_X86_64
 259         unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
 260
 261         if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
 262                 gfp |= GFP_DMA32;
 263 #endif
 264        return gfp;
 265 }
 266
 267 static inline void *
 268 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 269                 gfp_t gfp)
 270 {
 271         struct dma_mapping_ops *ops = get_dma_ops(dev);
 272         void *memory;
 273
 274         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 275
 276         if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
 277                 return memory;
 278
 279         if (!dev) {
 280                 dev = &x86_dma_fallback_dev;
 281                 gfp |= GFP_DMA;
 282         }
 283
 284         if (!is_device_dma_capable(dev))
 285                 return NULL;
 286
 287         if (!ops->alloc_coherent)
 288                 return NULL;
 289
 290         return ops->alloc_coherent(dev, size, dma_handle,
 291                                    dma_alloc_coherent_gfp_flags(dev, gfp));
 292 }
 293
 294 static inline void dma_free_coherent(struct device *dev, size_t size,
 295                                      void *vaddr, dma_addr_t bus)
 296 {
 297         struct dma_mapping_ops *ops = get_dma_ops(dev);
 298
 299         WARN_ON(irqs_disabled());       /* for portability */
 300
 301         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 302                 return;
 303
 304         if (ops->free_coherent)
 305                 ops->free_coherent(dev, size, vaddr, bus);
 306 }
 307
 308 #endif