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