git.oblomov.eu Git - linux-2.6/blob - include/asm-x86/dma-mapping_64.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 #include <linux/scatterlist.h>
  10 #include <asm/io.h>
  11 #include <asm/swiotlb.h>
  12
  13 struct dma_mapping_ops {
  14         int             (*mapping_error)(dma_addr_t dma_addr);
  15         void*           (*alloc_coherent)(struct device *dev, size_t size,
  16                                 dma_addr_t *dma_handle, gfp_t gfp);
  17         void            (*free_coherent)(struct device *dev, size_t size,
  18                                 void *vaddr, dma_addr_t dma_handle);
  19         dma_addr_t      (*map_single)(struct device *hwdev, void *ptr,
  20                                 size_t size, int direction);
  21         /* like map_single, but doesn't check the device mask */
  22         dma_addr_t      (*map_simple)(struct device *hwdev, char *ptr,
  23                                 size_t size, int direction);
  24         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  25                                 size_t size, int direction);
  26         void            (*sync_single_for_cpu)(struct device *hwdev,
  27                                 dma_addr_t dma_handle, size_t size,
  28                                 int direction);
  29         void            (*sync_single_for_device)(struct device *hwdev,
  30                                 dma_addr_t dma_handle, size_t size,
  31                                 int direction);
  32         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  33                                 dma_addr_t dma_handle, unsigned long offset,
  34                                 size_t size, int direction);
  35         void            (*sync_single_range_for_device)(struct device *hwdev,
  36                                 dma_addr_t dma_handle, unsigned long offset,
  37                                 size_t size, int direction);
  38         void            (*sync_sg_for_cpu)(struct device *hwdev,
  39                                 struct scatterlist *sg, int nelems,
  40                                 int direction);
  41         void            (*sync_sg_for_device)(struct device *hwdev,
  42                                 struct scatterlist *sg, int nelems,
  43                                 int direction);
  44         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  45                                 int nents, int direction);
  46         void            (*unmap_sg)(struct device *hwdev,
  47                                 struct scatterlist *sg, int nents,
  48                                 int direction);
  49         int             (*dma_supported)(struct device *hwdev, u64 mask);
  50         int             is_phys;
  51 };
  52
  53 extern dma_addr_t bad_dma_address;
  54 extern const struct dma_mapping_ops* dma_ops;
  55 extern int iommu_merge;
  56
  57 static inline int dma_mapping_error(dma_addr_t dma_addr)
  58 {
  59         if (dma_ops->mapping_error)
  60                 return dma_ops->mapping_error(dma_addr);
  61
  62         return (dma_addr == bad_dma_address);
  63 }
  64
  65 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  66 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  67
  68 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  69 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  70
  71 extern void *dma_alloc_coherent(struct device *dev, size_t size,
  72                                 dma_addr_t *dma_handle, gfp_t gfp);
  73 extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  74                               dma_addr_t dma_handle);
  75
  76 static inline dma_addr_t
  77 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  78                int direction)
  79 {
  80         BUG_ON(!valid_dma_direction(direction));
  81         return dma_ops->map_single(hwdev, ptr, size, direction);
  82 }
  83
  84 static inline void
  85 dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
  86                  int direction)
  87 {
  88         BUG_ON(!valid_dma_direction(direction));
  89         dma_ops->unmap_single(dev, addr, size, direction);
  90 }
  91
  92 #define dma_map_page(dev,page,offset,size,dir) \
  93         dma_map_single((dev), page_address(page)+(offset), (size), (dir))
  94
  95 #define dma_unmap_page dma_unmap_single
  96
  97 static inline void
  98 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
  99                         size_t size, int direction)
 100 {
 101         BUG_ON(!valid_dma_direction(direction));
 102         if (dma_ops->sync_single_for_cpu)
 103                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 104                                              direction);
 105         flush_write_buffers();
 106 }
 107
 108 static inline void
 109 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 110                            size_t size, int direction)
 111 {
 112         BUG_ON(!valid_dma_direction(direction));
 113         if (dma_ops->sync_single_for_device)
 114                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 115                                                 direction);
 116         flush_write_buffers();
 117 }
 118
 119 static inline void
 120 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 121                               unsigned long offset, size_t size, int direction)
 122 {
 123         BUG_ON(!valid_dma_direction(direction));
 124         if (dma_ops->sync_single_range_for_cpu) {
 125                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
 126         }
 127
 128         flush_write_buffers();
 129 }
 130
 131 static inline void
 132 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 133                                  unsigned long offset, size_t size, int direction)
 134 {
 135         BUG_ON(!valid_dma_direction(direction));
 136         if (dma_ops->sync_single_range_for_device)
 137                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 138                                                       offset, size, direction);
 139
 140         flush_write_buffers();
 141 }
 142
 143 static inline void
 144 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 145                     int nelems, int direction)
 146 {
 147         BUG_ON(!valid_dma_direction(direction));
 148         if (dma_ops->sync_sg_for_cpu)
 149                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 150         flush_write_buffers();
 151 }
 152
 153 static inline void
 154 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 155                        int nelems, int direction)
 156 {
 157         BUG_ON(!valid_dma_direction(direction));
 158         if (dma_ops->sync_sg_for_device) {
 159                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 160         }
 161
 162         flush_write_buffers();
 163 }
 164
 165 static inline int
 166 dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
 167 {
 168         BUG_ON(!valid_dma_direction(direction));
 169         return dma_ops->map_sg(hwdev, sg, nents, direction);
 170 }
 171
 172 static inline void
 173 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 174              int direction)
 175 {
 176         BUG_ON(!valid_dma_direction(direction));
 177         dma_ops->unmap_sg(hwdev, sg, nents, direction);
 178 }
 179
 180 extern int dma_supported(struct device *hwdev, u64 mask);
 181
 182 /* same for gart, swiotlb, and nommu */
 183 static inline int dma_get_cache_alignment(void)
 184 {
 185         return boot_cpu_data.x86_clflush_size;
 186 }
 187
 188 #define dma_is_consistent(d, h) 1
 189
 190 extern int dma_set_mask(struct device *dev, u64 mask);
 191
 192 static inline void
 193 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 194         enum dma_data_direction dir)
 195 {
 196         flush_write_buffers();
 197 }
 198
 199 extern struct device fallback_dev;
 200 extern int panic_on_overflow;
 201
 202 #endif /* _X8664_DMA_MAPPING_H */