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