include/asm-x86_64/mach-xen/asm/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 #if 0
  59 static inline int valid_dma_direction(int dma_direction)
  60 {
  61         return ((dma_direction == DMA_BIDIRECTIONAL) ||
  62                 (dma_direction == DMA_TO_DEVICE) ||
  63                 (dma_direction == DMA_FROM_DEVICE));
  64 }
  65
  66 static inline int dma_mapping_error(dma_addr_t dma_addr)
  67 {
  68         if (dma_ops->mapping_error)
  69                 return dma_ops->mapping_error(dma_addr);
  70
  71         return (dma_addr == bad_dma_address);
  72 }
  73
  74 extern void *dma_alloc_coherent(struct device *dev, size_t size,
  75                                 dma_addr_t *dma_handle, gfp_t gfp);
  76 extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  77                               dma_addr_t dma_handle);
  78
  79 static inline dma_addr_t
  80 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  81                int direction)
  82 {
  83         BUG_ON(!valid_dma_direction(direction));
  84         return dma_ops->map_single(hwdev, ptr, size, direction);
  85 }
  86
  87 static inline void
  88 dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
  89                  int direction)
  90 {
  91         BUG_ON(!valid_dma_direction(direction));
  92         dma_ops->unmap_single(dev, addr, size, direction);
  93 }
  94
  95 #define dma_map_page(dev,page,offset,size,dir) \
  96         dma_map_single((dev), page_address(page)+(offset), (size), (dir))
  97
  98 #define dma_unmap_page dma_unmap_single
  99
 100 static inline void
 101 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 102                         size_t size, int direction)
 103 {
 104         BUG_ON(!valid_dma_direction(direction));
 105         if (dma_ops->sync_single_for_cpu)
 106                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 107                                              direction);
 108         flush_write_buffers();
 109 }
 110
 111 static inline void
 112 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 113                            size_t size, int direction)
 114 {
 115         BUG_ON(!valid_dma_direction(direction));
 116         if (dma_ops->sync_single_for_device)
 117                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 118                                                 direction);
 119         flush_write_buffers();
 120 }
 121
 122 static inline void
 123 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 124                               unsigned long offset, size_t size, int direction)
 125 {
 126         BUG_ON(!valid_dma_direction(direction));
 127         if (dma_ops->sync_single_range_for_cpu) {
 128                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
 129         }
 130
 131         flush_write_buffers();
 132 }
 133
 134 static inline void
 135 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 136                                  unsigned long offset, size_t size, int direction)
 137 {
 138         BUG_ON(!valid_dma_direction(direction));
 139         if (dma_ops->sync_single_range_for_device)
 140                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 141                                                       offset, size, direction);
 142
 143         flush_write_buffers();
 144 }
 145
 146 static inline void
 147 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 148                     int nelems, int direction)
 149 {
 150         BUG_ON(!valid_dma_direction(direction));
 151         if (dma_ops->sync_sg_for_cpu)
 152                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 153         flush_write_buffers();
 154 }
 155
 156 static inline void
 157 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 158                        int nelems, int direction)
 159 {
 160         BUG_ON(!valid_dma_direction(direction));
 161         if (dma_ops->sync_sg_for_device) {
 162                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 163         }
 164
 165         flush_write_buffers();
 166 }
 167
 168 static inline int
 169 dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
 170 {
 171         BUG_ON(!valid_dma_direction(direction));
 172         return dma_ops->map_sg(hwdev, sg, nents, direction);
 173 }
 174
 175 static inline void
 176 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 177              int direction)
 178 {
 179         BUG_ON(!valid_dma_direction(direction));
 180         dma_ops->unmap_sg(hwdev, sg, nents, direction);
 181 }
 182
 183 extern int dma_supported(struct device *hwdev, u64 mask);
 184
 185 /* same for gart, swiotlb, and nommu */
 186 static inline int dma_get_cache_alignment(void)
 187 {
 188         return boot_cpu_data.x86_clflush_size;
 189 }
 190
 191 #define dma_is_consistent(h) 1
 192
 193 extern int dma_set_mask(struct device *dev, u64 mask);
 194
 195 static inline void
 196 dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
 197 {
 198         flush_write_buffers();
 199 }
 200
 201 extern struct device fallback_dev;
 202 #endif
 203 extern int panic_on_overflow;
 204
 205 #endif /* _X8664_DMA_MAPPING_H */
 206
 207 #include <asm-i386/mach-xen/asm/dma-mapping.h>