include/asm-x86/dma-mapping.h

   1 #ifndef _ASM_DMA_MAPPING_H_
   2 #define _ASM_DMA_MAPPING_H_
   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 extern dma_addr_t bad_dma_address;
  14 extern int iommu_merge;
  15 extern struct device fallback_dev;
  16 extern int panic_on_overflow;
  17 extern int forbid_dac;
  18 extern int force_iommu;
  19
  20 struct dma_mapping_ops {
  21         int             (*mapping_error)(dma_addr_t dma_addr);
  22         void*           (*alloc_coherent)(struct device *dev, size_t size,
  23                                 dma_addr_t *dma_handle, gfp_t gfp);
  24         void            (*free_coherent)(struct device *dev, size_t size,
  25                                 void *vaddr, dma_addr_t dma_handle);
  26         dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
  27                                 size_t size, int direction);
  28         /* like map_single, but doesn't check the device mask */
  29         dma_addr_t      (*map_simple)(struct device *hwdev, phys_addr_t ptr,
  30                                 size_t size, int direction);
  31         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  32                                 size_t size, int direction);
  33         void            (*sync_single_for_cpu)(struct device *hwdev,
  34                                 dma_addr_t dma_handle, size_t size,
  35                                 int direction);
  36         void            (*sync_single_for_device)(struct device *hwdev,
  37                                 dma_addr_t dma_handle, size_t size,
  38                                 int direction);
  39         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  40                                 dma_addr_t dma_handle, unsigned long offset,
  41                                 size_t size, int direction);
  42         void            (*sync_single_range_for_device)(struct device *hwdev,
  43                                 dma_addr_t dma_handle, unsigned long offset,
  44                                 size_t size, int direction);
  45         void            (*sync_sg_for_cpu)(struct device *hwdev,
  46                                 struct scatterlist *sg, int nelems,
  47                                 int direction);
  48         void            (*sync_sg_for_device)(struct device *hwdev,
  49                                 struct scatterlist *sg, int nelems,
  50                                 int direction);
  51         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  52                                 int nents, int direction);
  53         void            (*unmap_sg)(struct device *hwdev,
  54                                 struct scatterlist *sg, int nents,
  55                                 int direction);
  56         int             (*dma_supported)(struct device *hwdev, u64 mask);
  57         int             is_phys;
  58 };
  59
  60 extern const struct dma_mapping_ops *dma_ops;
  61
  62 static inline int dma_mapping_error(dma_addr_t dma_addr)
  63 {
  64         if (dma_ops->mapping_error)
  65                 return dma_ops->mapping_error(dma_addr);
  66
  67         return (dma_addr == bad_dma_address);
  68 }
  69
  70 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  71 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  72
  73 void *dma_alloc_coherent(struct device *dev, size_t size,
  74                            dma_addr_t *dma_handle, gfp_t flag);
  75
  76 void dma_free_coherent(struct device *dev, size_t size,
  77                          void *vaddr, dma_addr_t dma_handle);
  78
  79
  80 extern int dma_supported(struct device *hwdev, u64 mask);
  81 extern int dma_set_mask(struct device *dev, u64 mask);
  82
  83 static inline dma_addr_t
  84 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  85                int direction)
  86 {
  87         BUG_ON(!valid_dma_direction(direction));
  88         return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
  89 }
  90
  91 static inline void
  92 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
  93                  int direction)
  94 {
  95         BUG_ON(!valid_dma_direction(direction));
  96         if (dma_ops->unmap_single)
  97                 dma_ops->unmap_single(dev, addr, size, direction);
  98 }
  99
 100 static inline int
 101 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 102            int nents, int direction)
 103 {
 104         BUG_ON(!valid_dma_direction(direction));
 105         return dma_ops->map_sg(hwdev, sg, nents, direction);
 106 }
 107
 108 static inline void
 109 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 110              int direction)
 111 {
 112         BUG_ON(!valid_dma_direction(direction));
 113         if (dma_ops->unmap_sg)
 114                 dma_ops->unmap_sg(hwdev, sg, nents, direction);
 115 }
 116
 117 static inline void
 118 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 119                         size_t size, int direction)
 120 {
 121         BUG_ON(!valid_dma_direction(direction));
 122         if (dma_ops->sync_single_for_cpu)
 123                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 124                                              direction);
 125         flush_write_buffers();
 126 }
 127
 128 static inline void
 129 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 130                            size_t size, int direction)
 131 {
 132         BUG_ON(!valid_dma_direction(direction));
 133         if (dma_ops->sync_single_for_device)
 134                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 135                                                 direction);
 136         flush_write_buffers();
 137 }
 138
 139 static inline void
 140 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 141                               unsigned long offset, size_t size, int direction)
 142 {
 143         BUG_ON(!valid_dma_direction(direction));
 144         if (dma_ops->sync_single_range_for_cpu)
 145                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 146                                                    size, direction);
 147
 148         flush_write_buffers();
 149 }
 150
 151 static inline void
 152 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 153                                  unsigned long offset, size_t size,
 154                                  int direction)
 155 {
 156         BUG_ON(!valid_dma_direction(direction));
 157         if (dma_ops->sync_single_range_for_device)
 158                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 159                                                       offset, size, direction);
 160
 161         flush_write_buffers();
 162 }
 163
 164 static inline void
 165 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 166                     int nelems, int direction)
 167 {
 168         BUG_ON(!valid_dma_direction(direction));
 169         if (dma_ops->sync_sg_for_cpu)
 170                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 171         flush_write_buffers();
 172 }
 173
 174 static inline void
 175 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 176                        int nelems, int direction)
 177 {
 178         BUG_ON(!valid_dma_direction(direction));
 179         if (dma_ops->sync_sg_for_device)
 180                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 181
 182         flush_write_buffers();
 183 }
 184
 185 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 186                                       size_t offset, size_t size,
 187                                       int direction)
 188 {
 189         BUG_ON(!valid_dma_direction(direction));
 190         return dma_ops->map_single(dev, page_to_phys(page)+offset,
 191                                    size, direction);
 192 }
 193
 194 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 195                                   size_t size, int direction)
 196 {
 197         dma_unmap_single(dev, addr, size, direction);
 198 }
 199
 200 static inline void
 201 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 202         enum dma_data_direction dir)
 203 {
 204         flush_write_buffers();
 205 }
 206
 207 static inline int dma_get_cache_alignment(void)
 208 {
 209         /* no easy way to get cache size on all x86, so return the
 210          * maximum possible, to be safe */
 211         return boot_cpu_data.x86_clflush_size;
 212 }
 213
 214 #define dma_is_consistent(d, h) (1)
 215
 216 #ifdef CONFIG_X86_32
 217 #  define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 218 struct dma_coherent_mem {
 219         void            *virt_base;
 220         u32             device_base;
 221         int             size;
 222         int             flags;
 223         unsigned long   *bitmap;
 224 };
 225
 226 extern int
 227 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 228                             dma_addr_t device_addr, size_t size, int flags);
 229
 230 extern void
 231 dma_release_declared_memory(struct device *dev);
 232
 233 extern void *
 234 dma_mark_declared_memory_occupied(struct device *dev,
 235                                   dma_addr_t device_addr, size_t size);
 236 #endif /* CONFIG_X86_32 */
 237 #endif