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 extern int force_iommu;
  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         dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
  28                                 size_t size, int direction);
  29         /* like map_single, but doesn't check the device mask */
  30         dma_addr_t      (*map_simple)(struct device *hwdev, phys_addr_t ptr,
  31                                 size_t size, int direction);
  32         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  33                                 size_t size, int direction);
  34         void            (*sync_single_for_cpu)(struct device *hwdev,
  35                                 dma_addr_t dma_handle, size_t size,
  36                                 int direction);
  37         void            (*sync_single_for_device)(struct device *hwdev,
  38                                 dma_addr_t dma_handle, size_t size,
  39                                 int direction);
  40         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  41                                 dma_addr_t dma_handle, unsigned long offset,
  42                                 size_t size, int direction);
  43         void            (*sync_single_range_for_device)(struct device *hwdev,
  44                                 dma_addr_t dma_handle, unsigned long offset,
  45                                 size_t size, int direction);
  46         void            (*sync_sg_for_cpu)(struct device *hwdev,
  47                                 struct scatterlist *sg, int nelems,
  48                                 int direction);
  49         void            (*sync_sg_for_device)(struct device *hwdev,
  50                                 struct scatterlist *sg, int nelems,
  51                                 int direction);
  52         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  53                                 int nents, int direction);
  54         void            (*unmap_sg)(struct device *hwdev,
  55                                 struct scatterlist *sg, int nents,
  56                                 int direction);
  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 #ifdef CONFIG_X86_32
  79         return 0;
  80 #else
  81         struct dma_mapping_ops *ops = get_dma_ops(dev);
  82         if (ops->mapping_error)
  83                 return ops->mapping_error(dev, dma_addr);
  84
  85         return (dma_addr == bad_dma_address);
  86 #endif
  87 }
  88
  89 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  90 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  91 #define dma_is_consistent(d, h) (1)
  92
  93 extern int dma_supported(struct device *hwdev, u64 mask);
  94 extern int dma_set_mask(struct device *dev, u64 mask);
  95
  96 static inline dma_addr_t
  97 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  98                int direction)
  99 {
 100         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 101
 102         BUG_ON(!valid_dma_direction(direction));
 103         return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
 104 }
 105
 106 static inline void
 107 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
 108                  int direction)
 109 {
 110         struct dma_mapping_ops *ops = get_dma_ops(dev);
 111
 112         BUG_ON(!valid_dma_direction(direction));
 113         if (ops->unmap_single)
 114                 ops->unmap_single(dev, addr, size, direction);
 115 }
 116
 117 static inline int
 118 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 119            int nents, int direction)
 120 {
 121         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 122
 123         BUG_ON(!valid_dma_direction(direction));
 124         return ops->map_sg(hwdev, sg, nents, direction);
 125 }
 126
 127 static inline void
 128 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 129              int direction)
 130 {
 131         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 132
 133         BUG_ON(!valid_dma_direction(direction));
 134         if (ops->unmap_sg)
 135                 ops->unmap_sg(hwdev, sg, nents, direction);
 136 }
 137
 138 static inline void
 139 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 140                         size_t size, int direction)
 141 {
 142         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 143
 144         BUG_ON(!valid_dma_direction(direction));
 145         if (ops->sync_single_for_cpu)
 146                 ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
 147         flush_write_buffers();
 148 }
 149
 150 static inline void
 151 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 152                            size_t size, int direction)
 153 {
 154         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 155
 156         BUG_ON(!valid_dma_direction(direction));
 157         if (ops->sync_single_for_device)
 158                 ops->sync_single_for_device(hwdev, dma_handle, size, direction);
 159         flush_write_buffers();
 160 }
 161
 162 static inline void
 163 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 164                               unsigned long offset, size_t size, int direction)
 165 {
 166         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 167
 168         BUG_ON(!valid_dma_direction(direction));
 169         if (ops->sync_single_range_for_cpu)
 170                 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 171                                                size, direction);
 172         flush_write_buffers();
 173 }
 174
 175 static inline void
 176 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 177                                  unsigned long offset, size_t size,
 178                                  int direction)
 179 {
 180         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 181
 182         BUG_ON(!valid_dma_direction(direction));
 183         if (ops->sync_single_range_for_device)
 184                 ops->sync_single_range_for_device(hwdev, dma_handle,
 185                                                   offset, size, direction);
 186         flush_write_buffers();
 187 }
 188
 189 static inline void
 190 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 191                     int nelems, int direction)
 192 {
 193         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 194
 195         BUG_ON(!valid_dma_direction(direction));
 196         if (ops->sync_sg_for_cpu)
 197                 ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 198         flush_write_buffers();
 199 }
 200
 201 static inline void
 202 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 203                        int nelems, int direction)
 204 {
 205         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 206
 207         BUG_ON(!valid_dma_direction(direction));
 208         if (ops->sync_sg_for_device)
 209                 ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 210
 211         flush_write_buffers();
 212 }
 213
 214 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 215                                       size_t offset, size_t size,
 216                                       int direction)
 217 {
 218         struct dma_mapping_ops *ops = get_dma_ops(dev);
 219
 220         BUG_ON(!valid_dma_direction(direction));
 221         return ops->map_single(dev, page_to_phys(page) + offset,
 222                                size, direction);
 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 void *
 246 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 247                 gfp_t gfp)
 248 {
 249         struct dma_mapping_ops *ops = get_dma_ops(dev);
 250         void *memory;
 251
 252         if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
 253                 return memory;
 254
 255         if (!dev) {
 256                 dev = &x86_dma_fallback_dev;
 257                 gfp |= GFP_DMA;
 258         }
 259
 260         if (ops->alloc_coherent)
 261                 return ops->alloc_coherent(dev, size,
 262                                 dma_handle, gfp);
 263         return NULL;
 264 }
 265
 266 static inline void dma_free_coherent(struct device *dev, size_t size,
 267                                      void *vaddr, dma_addr_t bus)
 268 {
 269         struct dma_mapping_ops *ops = get_dma_ops(dev);
 270
 271         WARN_ON(irqs_disabled());       /* for portability */
 272
 273         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 274                 return;
 275
 276         if (ops->free_coherent)
 277                 ops->free_coherent(dev, size, vaddr, bus);
 278 }
 279
 280 #endif