include/asm-x86/dma-mapping.h

   1 #ifndef _ASM_DMA_MAPPING_H_
   2 #define _ASM_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
  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 static inline dma_addr_t
  93 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  94                int direction)
  95 {
  96         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
  97
  98         BUG_ON(!valid_dma_direction(direction));
  99         return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
 100 }
 101
 102 static inline void
 103 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
 104                  int direction)
 105 {
 106         struct dma_mapping_ops *ops = get_dma_ops(dev);
 107
 108         BUG_ON(!valid_dma_direction(direction));
 109         if (ops->unmap_single)
 110                 ops->unmap_single(dev, addr, size, direction);
 111 }
 112
 113 static inline int
 114 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 115            int nents, int direction)
 116 {
 117         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 118
 119         BUG_ON(!valid_dma_direction(direction));
 120         return ops->map_sg(hwdev, sg, nents, direction);
 121 }
 122
 123 static inline void
 124 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 125              int direction)
 126 {
 127         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 128
 129         BUG_ON(!valid_dma_direction(direction));
 130         if (ops->unmap_sg)
 131                 ops->unmap_sg(hwdev, sg, nents, direction);
 132 }
 133
 134 static inline void
 135 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 136                         size_t size, int direction)
 137 {
 138         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 139
 140         BUG_ON(!valid_dma_direction(direction));
 141         if (ops->sync_single_for_cpu)
 142                 ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
 143         flush_write_buffers();
 144 }
 145
 146 static inline void
 147 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 148                            size_t size, int direction)
 149 {
 150         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 151
 152         BUG_ON(!valid_dma_direction(direction));
 153         if (ops->sync_single_for_device)
 154                 ops->sync_single_for_device(hwdev, dma_handle, size, direction);
 155         flush_write_buffers();
 156 }
 157
 158 static inline void
 159 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 160                               unsigned long offset, size_t size, int direction)
 161 {
 162         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 163
 164         BUG_ON(!valid_dma_direction(direction));
 165         if (ops->sync_single_range_for_cpu)
 166                 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 167                                                size, direction);
 168         flush_write_buffers();
 169 }
 170
 171 static inline void
 172 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 173                                  unsigned long offset, size_t size,
 174                                  int direction)
 175 {
 176         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 177
 178         BUG_ON(!valid_dma_direction(direction));
 179         if (ops->sync_single_range_for_device)
 180                 ops->sync_single_range_for_device(hwdev, dma_handle,
 181                                                   offset, size, direction);
 182         flush_write_buffers();
 183 }
 184
 185 static inline void
 186 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 187                     int nelems, int direction)
 188 {
 189         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 190
 191         BUG_ON(!valid_dma_direction(direction));
 192         if (ops->sync_sg_for_cpu)
 193                 ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 194         flush_write_buffers();
 195 }
 196
 197 static inline void
 198 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 199                        int nelems, int direction)
 200 {
 201         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 202
 203         BUG_ON(!valid_dma_direction(direction));
 204         if (ops->sync_sg_for_device)
 205                 ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 206
 207         flush_write_buffers();
 208 }
 209
 210 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 211                                       size_t offset, size_t size,
 212                                       int direction)
 213 {
 214         struct dma_mapping_ops *ops = get_dma_ops(dev);
 215
 216         BUG_ON(!valid_dma_direction(direction));
 217         return ops->map_single(dev, page_to_phys(page) + offset,
 218                                size, direction);
 219 }
 220
 221 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 222                                   size_t size, int direction)
 223 {
 224         dma_unmap_single(dev, addr, size, direction);
 225 }
 226
 227 static inline void
 228 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 229         enum dma_data_direction dir)
 230 {
 231         flush_write_buffers();
 232 }
 233
 234 static inline int dma_get_cache_alignment(void)
 235 {
 236         /* no easy way to get cache size on all x86, so return the
 237          * maximum possible, to be safe */
 238         return boot_cpu_data.x86_clflush_size;
 239 }
 240
 241 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
 242                                                     gfp_t gfp)
 243 {
 244         unsigned long dma_mask = 0;
 245
 246         dma_mask = dev->coherent_dma_mask;
 247         if (!dma_mask)
 248                 dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK;
 249
 250         return dma_mask;
 251 }
 252
 253 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
 254 {
 255 #ifdef CONFIG_X86_64
 256         unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
 257
 258         if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
 259                 gfp |= GFP_DMA32;
 260 #endif
 261        return gfp;
 262 }
 263
 264 static inline void *
 265 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 266                 gfp_t gfp)
 267 {
 268         struct dma_mapping_ops *ops = get_dma_ops(dev);
 269         void *memory;
 270
 271         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 272
 273         if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
 274                 return memory;
 275
 276         if (!dev) {
 277                 dev = &x86_dma_fallback_dev;
 278                 gfp |= GFP_DMA;
 279         }
 280
 281         if (!dev->dma_mask)
 282                 return NULL;
 283
 284         if (!ops->alloc_coherent)
 285                 return NULL;
 286
 287         return ops->alloc_coherent(dev, size, dma_handle,
 288                                    dma_alloc_coherent_gfp_flags(dev, gfp));
 289 }
 290
 291 static inline void dma_free_coherent(struct device *dev, size_t size,
 292                                      void *vaddr, dma_addr_t bus)
 293 {
 294         struct dma_mapping_ops *ops = get_dma_ops(dev);
 295
 296         WARN_ON(irqs_disabled());       /* for portability */
 297
 298         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 299                 return;
 300
 301         if (ops->free_coherent)
 302                 ops->free_coherent(dev, size, vaddr, bus);
 303 }
 304
 305 #endif