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   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_64
  75         struct dma_mapping_ops *ops = get_dma_ops(dev);
  76         if (ops->mapping_error)
  77                 return ops->mapping_error(dev, dma_addr);
  78
  79 #endif
  80         return (dma_addr == bad_dma_address);
  81 }
  82
  83 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  84 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  85 #define dma_is_consistent(d, h) (1)
  86
  87 extern int dma_supported(struct device *hwdev, u64 mask);
  88 extern int dma_set_mask(struct device *dev, u64 mask);
  89
  90 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
  91                                         dma_addr_t *dma_addr, gfp_t flag);
  92
  93 static inline dma_addr_t
  94 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  95                int direction)
  96 {
  97         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
  98
  99         BUG_ON(!valid_dma_direction(direction));
 100         return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
 101 }
 102
 103 static inline void
 104 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
 105                  int direction)
 106 {
 107         struct dma_mapping_ops *ops = get_dma_ops(dev);
 108
 109         BUG_ON(!valid_dma_direction(direction));
 110         if (ops->unmap_single)
 111                 ops->unmap_single(dev, addr, size, direction);
 112 }
 113
 114 static inline int
 115 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 116            int nents, int direction)
 117 {
 118         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 119
 120         BUG_ON(!valid_dma_direction(direction));
 121         return ops->map_sg(hwdev, sg, nents, direction);
 122 }
 123
 124 static inline void
 125 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 126              int direction)
 127 {
 128         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 129
 130         BUG_ON(!valid_dma_direction(direction));
 131         if (ops->unmap_sg)
 132                 ops->unmap_sg(hwdev, sg, nents, direction);
 133 }
 134
 135 static inline void
 136 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 137                         size_t size, int direction)
 138 {
 139         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 140
 141         BUG_ON(!valid_dma_direction(direction));
 142         if (ops->sync_single_for_cpu)
 143                 ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
 144         flush_write_buffers();
 145 }
 146
 147 static inline void
 148 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 149                            size_t size, int direction)
 150 {
 151         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 152
 153         BUG_ON(!valid_dma_direction(direction));
 154         if (ops->sync_single_for_device)
 155                 ops->sync_single_for_device(hwdev, dma_handle, size, direction);
 156         flush_write_buffers();
 157 }
 158
 159 static inline void
 160 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 161                               unsigned long offset, size_t size, int direction)
 162 {
 163         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 164
 165         BUG_ON(!valid_dma_direction(direction));
 166         if (ops->sync_single_range_for_cpu)
 167                 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 168                                                size, direction);
 169         flush_write_buffers();
 170 }
 171
 172 static inline void
 173 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 174                                  unsigned long offset, size_t size,
 175                                  int direction)
 176 {
 177         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 178
 179         BUG_ON(!valid_dma_direction(direction));
 180         if (ops->sync_single_range_for_device)
 181                 ops->sync_single_range_for_device(hwdev, dma_handle,
 182                                                   offset, size, direction);
 183         flush_write_buffers();
 184 }
 185
 186 static inline void
 187 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 188                     int nelems, int direction)
 189 {
 190         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 191
 192         BUG_ON(!valid_dma_direction(direction));
 193         if (ops->sync_sg_for_cpu)
 194                 ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 195         flush_write_buffers();
 196 }
 197
 198 static inline void
 199 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 200                        int nelems, int direction)
 201 {
 202         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 203
 204         BUG_ON(!valid_dma_direction(direction));
 205         if (ops->sync_sg_for_device)
 206                 ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 207
 208         flush_write_buffers();
 209 }
 210
 211 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 212                                       size_t offset, size_t size,
 213                                       int direction)
 214 {
 215         struct dma_mapping_ops *ops = get_dma_ops(dev);
 216
 217         BUG_ON(!valid_dma_direction(direction));
 218         return ops->map_single(dev, page_to_phys(page) + offset,
 219                                size, direction);
 220 }
 221
 222 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 223                                   size_t size, int direction)
 224 {
 225         dma_unmap_single(dev, addr, size, direction);
 226 }
 227
 228 static inline void
 229 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 230         enum dma_data_direction dir)
 231 {
 232         flush_write_buffers();
 233 }
 234
 235 static inline int dma_get_cache_alignment(void)
 236 {
 237         /* no easy way to get cache size on all x86, so return the
 238          * maximum possible, to be safe */
 239         return boot_cpu_data.x86_clflush_size;
 240 }
 241
 242 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
 243                                                     gfp_t gfp)
 244 {
 245         unsigned long dma_mask = 0;
 246
 247         dma_mask = dev->coherent_dma_mask;
 248         if (!dma_mask)
 249                 dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK;
 250
 251         return dma_mask;
 252 }
 253
 254 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
 255 {
 256         unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
 257
 258         if (dma_mask <= DMA_24BIT_MASK)
 259                 gfp |= GFP_DMA;
 260 #ifdef CONFIG_X86_64
 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