include/asm-x86_64/dma-mapping.h

   1 #ifndef _X8664_DMA_MAPPING_H
   2 #define _X8664_DMA_MAPPING_H 1
   3
   4 /*
   5  * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
   6  * documentation.
   7  */
   8
   9
  10 #include <asm/scatterlist.h>
  11 #include <asm/io.h>
  12 #include <asm/swiotlb.h>
  13
  14 struct dma_mapping_ops {
  15         int             (*mapping_error)(dma_addr_t dma_addr);
  16         void*           (*alloc_coherent)(struct device *dev, size_t size,
  17                                 dma_addr_t *dma_handle, gfp_t gfp);
  18         void            (*free_coherent)(struct device *dev, size_t size,
  19                                 void *vaddr, dma_addr_t dma_handle);
  20         dma_addr_t      (*map_single)(struct device *hwdev, void *ptr,
  21                                 size_t size, int direction);
  22         /* like map_single, but doesn't check the device mask */
  23         dma_addr_t      (*map_simple)(struct device *hwdev, char *ptr,
  24                                 size_t size, int direction);
  25         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  26                                 size_t size, int direction);
  27         void            (*sync_single_for_cpu)(struct device *hwdev,
  28                                 dma_addr_t dma_handle, size_t size,
  29                                 int direction);
  30         void            (*sync_single_for_device)(struct device *hwdev,
  31                                 dma_addr_t dma_handle, size_t size,
  32                                 int direction);
  33         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  34                                 dma_addr_t dma_handle, unsigned long offset,
  35                                 size_t size, int direction);
  36         void            (*sync_single_range_for_device)(struct device *hwdev,
  37                                 dma_addr_t dma_handle, unsigned long offset,
  38                                 size_t size, int direction);
  39         void            (*sync_sg_for_cpu)(struct device *hwdev,
  40                                 struct scatterlist *sg, int nelems,
  41                                 int direction);
  42         void            (*sync_sg_for_device)(struct device *hwdev,
  43                                 struct scatterlist *sg, int nelems,
  44                                 int direction);
  45         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  46                                 int nents, int direction);
  47         void            (*unmap_sg)(struct device *hwdev,
  48                                 struct scatterlist *sg, int nents,
  49                                 int direction);
  50         int             (*dma_supported)(struct device *hwdev, u64 mask);
  51         int             is_phys;
  52 };
  53
  54 extern dma_addr_t bad_dma_address;
  55 extern struct dma_mapping_ops* dma_ops;
  56 extern int iommu_merge;
  57
  58 static inline int dma_mapping_error(dma_addr_t dma_addr)
  59 {
  60         if (dma_ops->mapping_error)
  61                 return dma_ops->mapping_error(dma_addr);
  62
  63         return (dma_addr == bad_dma_address);
  64 }
  65
  66 extern void *dma_alloc_coherent(struct device *dev, size_t size,
  67                                 dma_addr_t *dma_handle, gfp_t gfp);
  68 extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  69                               dma_addr_t dma_handle);
  70
  71 static inline dma_addr_t
  72 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  73                int direction)
  74 {
  75         return dma_ops->map_single(hwdev, ptr, size, direction);
  76 }
  77
  78 static inline void
  79 dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
  80                  int direction)
  81 {
  82         dma_ops->unmap_single(dev, addr, size, direction);
  83 }
  84
  85 #define dma_map_page(dev,page,offset,size,dir) \
  86         dma_map_single((dev), page_address(page)+(offset), (size), (dir))
  87
  88 #define dma_unmap_page dma_unmap_single
  89
  90 static inline void
  91 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
  92                         size_t size, int direction)
  93 {
  94         if (dma_ops->sync_single_for_cpu)
  95                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
  96                                              direction);
  97         flush_write_buffers();
  98 }
  99
 100 static inline void
 101 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 102                            size_t size, int direction)
 103 {
 104         if (dma_ops->sync_single_for_device)
 105                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 106                                                 direction);
 107         flush_write_buffers();
 108 }
 109
 110 static inline void
 111 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 112                               unsigned long offset, size_t size, int direction)
 113 {
 114         if (dma_ops->sync_single_range_for_cpu) {
 115                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
 116         }
 117
 118         flush_write_buffers();
 119 }
 120
 121 static inline void
 122 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 123                                  unsigned long offset, size_t size, int direction)
 124 {
 125         if (dma_ops->sync_single_range_for_device)
 126                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 127                                                       offset, size, direction);
 128
 129         flush_write_buffers();
 130 }
 131
 132 static inline void
 133 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 134                     int nelems, int direction)
 135 {
 136         if (dma_ops->sync_sg_for_cpu)
 137                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 138         flush_write_buffers();
 139 }
 140
 141 static inline void
 142 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 143                        int nelems, int direction)
 144 {
 145         if (dma_ops->sync_sg_for_device) {
 146                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 147         }
 148
 149         flush_write_buffers();
 150 }
 151
 152 static inline int
 153 dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
 154 {
 155         return dma_ops->map_sg(hwdev, sg, nents, direction);
 156 }
 157
 158 static inline void
 159 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 160              int direction)
 161 {
 162         dma_ops->unmap_sg(hwdev, sg, nents, direction);
 163 }
 164
 165 extern int dma_supported(struct device *hwdev, u64 mask);
 166
 167 /* same for gart, swiotlb, and nommu */
 168 static inline int dma_get_cache_alignment(void)
 169 {
 170         return boot_cpu_data.x86_clflush_size;
 171 }
 172
 173 #define dma_is_consistent(h) 1
 174
 175 extern int dma_set_mask(struct device *dev, u64 mask);
 176
 177 static inline void
 178 dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
 179 {
 180         flush_write_buffers();
 181 }
 182
 183 extern struct device fallback_dev;
 184 extern int panic_on_overflow;
 185
 186 #endif /* _X8664_DMA_MAPPING_H */