git.oblomov.eu Git - linux-2.6/blob - 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
  13 extern dma_addr_t bad_dma_address;
  14 extern int iommu_merge;
  15 extern struct device fallback_dev;
  16 extern int panic_on_overflow;
  17 extern int force_iommu;
  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         /* like map_single, but doesn't check the device mask */
  29         dma_addr_t      (*map_simple)(struct device *hwdev, phys_addr_t ptr,
  30                                 size_t size, int direction);
  31         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  32                                 size_t size, int direction);
  33         void            (*sync_single_for_cpu)(struct device *hwdev,
  34                                 dma_addr_t dma_handle, size_t size,
  35                                 int direction);
  36         void            (*sync_single_for_device)(struct device *hwdev,
  37                                 dma_addr_t dma_handle, size_t size,
  38                                 int direction);
  39         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  40                                 dma_addr_t dma_handle, unsigned long offset,
  41                                 size_t size, int direction);
  42         void            (*sync_single_range_for_device)(struct device *hwdev,
  43                                 dma_addr_t dma_handle, unsigned long offset,
  44                                 size_t size, int direction);
  45         void            (*sync_sg_for_cpu)(struct device *hwdev,
  46                                 struct scatterlist *sg, int nelems,
  47                                 int direction);
  48         void            (*sync_sg_for_device)(struct device *hwdev,
  49                                 struct scatterlist *sg, int nelems,
  50                                 int direction);
  51         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  52                                 int nents, int direction);
  53         void            (*unmap_sg)(struct device *hwdev,
  54                                 struct scatterlist *sg, int nents,
  55                                 int direction);
  56         int             (*dma_supported)(struct device *hwdev, u64 mask);
  57         int             is_phys;
  58 };
  59
  60 extern struct dma_mapping_ops *dma_ops;
  61
  62 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
  63 {
  64 #ifdef CONFIG_X86_32
  65         return dma_ops;
  66 #else
  67         if (unlikely(!dev) || !dev->archdata.dma_ops)
  68                 return dma_ops;
  69         else
  70                 return dev->archdata.dma_ops;
  71 #endif
  72 }
  73
  74 /* Make sure we keep the same behaviour */
  75 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  76 {
  77 #ifdef CONFIG_X86_32
  78         return 0;
  79 #else
  80         struct dma_mapping_ops *ops = get_dma_ops(dev);
  81         if (ops->mapping_error)
  82                 return ops->mapping_error(dev, dma_addr);
  83
  84         return (dma_addr == bad_dma_address);
  85 #endif
  86 }
  87
  88 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  89 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  90
  91 void *dma_alloc_coherent(struct device *dev, size_t size,
  92                            dma_addr_t *dma_handle, gfp_t flag);
  93
  94 void dma_free_coherent(struct device *dev, size_t size,
  95                          void *vaddr, dma_addr_t dma_handle);
  96
  97
  98 extern int dma_supported(struct device *hwdev, u64 mask);
  99 extern int dma_set_mask(struct device *dev, u64 mask);
 100
 101 static inline dma_addr_t
 102 dma_map_single(struct device *hwdev, void *ptr, size_t size,
 103                int direction)
 104 {
 105         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 106
 107         BUG_ON(!valid_dma_direction(direction));
 108         return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
 109 }
 110
 111 static inline void
 112 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
 113                  int direction)
 114 {
 115         struct dma_mapping_ops *ops = get_dma_ops(dev);
 116
 117         BUG_ON(!valid_dma_direction(direction));
 118         if (ops->unmap_single)
 119                 ops->unmap_single(dev, addr, size, direction);
 120 }
 121
 122 static inline int
 123 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 124            int nents, int direction)
 125 {
 126         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 127
 128         BUG_ON(!valid_dma_direction(direction));
 129         return ops->map_sg(hwdev, sg, nents, direction);
 130 }
 131
 132 static inline void
 133 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 134              int direction)
 135 {
 136         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 137
 138         BUG_ON(!valid_dma_direction(direction));
 139         if (ops->unmap_sg)
 140                 ops->unmap_sg(hwdev, sg, nents, direction);
 141 }
 142
 143 static inline void
 144 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 145                         size_t size, int direction)
 146 {
 147         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 148
 149         BUG_ON(!valid_dma_direction(direction));
 150         if (ops->sync_single_for_cpu)
 151                 ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
 152         flush_write_buffers();
 153 }
 154
 155 static inline void
 156 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 157                            size_t size, int direction)
 158 {
 159         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 160
 161         BUG_ON(!valid_dma_direction(direction));
 162         if (ops->sync_single_for_device)
 163                 ops->sync_single_for_device(hwdev, dma_handle, size, direction);
 164         flush_write_buffers();
 165 }
 166
 167 static inline void
 168 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 169                               unsigned long offset, size_t size, int direction)
 170 {
 171         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 172
 173         BUG_ON(!valid_dma_direction(direction));
 174         if (ops->sync_single_range_for_cpu)
 175                 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 176                                                size, direction);
 177         flush_write_buffers();
 178 }
 179
 180 static inline void
 181 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 182                                  unsigned long offset, size_t size,
 183                                  int direction)
 184 {
 185         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 186
 187         BUG_ON(!valid_dma_direction(direction));
 188         if (ops->sync_single_range_for_device)
 189                 ops->sync_single_range_for_device(hwdev, dma_handle,
 190                                                   offset, size, direction);
 191         flush_write_buffers();
 192 }
 193
 194 static inline void
 195 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 196                     int nelems, int direction)
 197 {
 198         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 199
 200         BUG_ON(!valid_dma_direction(direction));
 201         if (ops->sync_sg_for_cpu)
 202                 ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 203         flush_write_buffers();
 204 }
 205
 206 static inline void
 207 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 208                        int nelems, int direction)
 209 {
 210         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 211
 212         BUG_ON(!valid_dma_direction(direction));
 213         if (ops->sync_sg_for_device)
 214                 ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 215
 216         flush_write_buffers();
 217 }
 218
 219 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 220                                       size_t offset, size_t size,
 221                                       int direction)
 222 {
 223         struct dma_mapping_ops *ops = get_dma_ops(dev);
 224
 225         BUG_ON(!valid_dma_direction(direction));
 226         return ops->map_single(dev, page_to_phys(page) + offset,
 227                                size, direction);
 228 }
 229
 230 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 231                                   size_t size, int direction)
 232 {
 233         dma_unmap_single(dev, addr, size, direction);
 234 }
 235
 236 static inline void
 237 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 238         enum dma_data_direction dir)
 239 {
 240         flush_write_buffers();
 241 }
 242
 243 static inline int dma_get_cache_alignment(void)
 244 {
 245         /* no easy way to get cache size on all x86, so return the
 246          * maximum possible, to be safe */
 247         return boot_cpu_data.x86_clflush_size;
 248 }
 249
 250 #define dma_is_consistent(d, h) (1)
 251
 252 #include <asm-generic/dma-coherent.h>
 253 #endif