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