include/asm-generic/dma-mapping-common.h

   1 #ifndef _ASM_GENERIC_DMA_MAPPING_H
   2 #define _ASM_GENERIC_DMA_MAPPING_H
   3
   4 #include <linux/kmemcheck.h>
   5 #include <linux/bug.h>
   6 #include <linux/scatterlist.h>
   7 #include <linux/dma-debug.h>
   8 #include <linux/dma-attrs.h>
   9
  10 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
  11                                               size_t size,
  12                                               enum dma_data_direction dir,
  13                                               struct dma_attrs *attrs)
  14 {
  15         struct dma_map_ops *ops = get_dma_ops(dev);
  16         dma_addr_t addr;
  17
  18         kmemcheck_mark_initialized(ptr, size);
  19         BUG_ON(!valid_dma_direction(dir));
  20         addr = ops->map_page(dev, virt_to_page(ptr),
  21                              (unsigned long)ptr & ~PAGE_MASK, size,
  22                              dir, attrs);
  23         debug_dma_map_page(dev, virt_to_page(ptr),
  24                            (unsigned long)ptr & ~PAGE_MASK, size,
  25                            dir, addr, true);
  26         return addr;
  27 }
  28
  29 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
  30                                           size_t size,
  31                                           enum dma_data_direction dir,
  32                                           struct dma_attrs *attrs)
  33 {
  34         struct dma_map_ops *ops = get_dma_ops(dev);
  35
  36         BUG_ON(!valid_dma_direction(dir));
  37         if (ops->unmap_page)
  38                 ops->unmap_page(dev, addr, size, dir, attrs);
  39         debug_dma_unmap_page(dev, addr, size, dir, true);
  40 }
  41
  42 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
  43                                    int nents, enum dma_data_direction dir,
  44                                    struct dma_attrs *attrs)
  45 {
  46         struct dma_map_ops *ops = get_dma_ops(dev);
  47         int i, ents;
  48         struct scatterlist *s;
  49
  50         for_each_sg(sg, s, nents, i)
  51                 kmemcheck_mark_initialized(sg_virt(s), s->length);
  52         BUG_ON(!valid_dma_direction(dir));
  53         ents = ops->map_sg(dev, sg, nents, dir, attrs);
  54         debug_dma_map_sg(dev, sg, nents, ents, dir);
  55
  56         return ents;
  57 }
  58
  59 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
  60                                       int nents, enum dma_data_direction dir,
  61                                       struct dma_attrs *attrs)
  62 {
  63         struct dma_map_ops *ops = get_dma_ops(dev);
  64
  65         BUG_ON(!valid_dma_direction(dir));
  66         debug_dma_unmap_sg(dev, sg, nents, dir);
  67         if (ops->unmap_sg)
  68                 ops->unmap_sg(dev, sg, nents, dir, attrs);
  69 }
  70
  71 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
  72                                       size_t offset, size_t size,
  73                                       enum dma_data_direction dir)
  74 {
  75         struct dma_map_ops *ops = get_dma_ops(dev);
  76         dma_addr_t addr;
  77
  78         kmemcheck_mark_initialized(page_address(page) + offset, size);
  79         BUG_ON(!valid_dma_direction(dir));
  80         addr = ops->map_page(dev, page, offset, size, dir, NULL);
  81         debug_dma_map_page(dev, page, offset, size, dir, addr, false);
  82
  83         return addr;
  84 }
  85
  86 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
  87                                   size_t size, enum dma_data_direction dir)
  88 {
  89         struct dma_map_ops *ops = get_dma_ops(dev);
  90
  91         BUG_ON(!valid_dma_direction(dir));
  92         if (ops->unmap_page)
  93                 ops->unmap_page(dev, addr, size, dir, NULL);
  94         debug_dma_unmap_page(dev, addr, size, dir, false);
  95 }
  96
  97 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
  98                                            size_t size,
  99                                            enum dma_data_direction dir)
 100 {
 101         struct dma_map_ops *ops = get_dma_ops(dev);
 102
 103         BUG_ON(!valid_dma_direction(dir));
 104         if (ops->sync_single_for_cpu)
 105                 ops->sync_single_for_cpu(dev, addr, size, dir);
 106         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 107 }
 108
 109 static inline void dma_sync_single_for_device(struct device *dev,
 110                                               dma_addr_t addr, size_t size,
 111                                               enum dma_data_direction dir)
 112 {
 113         struct dma_map_ops *ops = get_dma_ops(dev);
 114
 115         BUG_ON(!valid_dma_direction(dir));
 116         if (ops->sync_single_for_device)
 117                 ops->sync_single_for_device(dev, addr, size, dir);
 118         debug_dma_sync_single_for_device(dev, addr, size, dir);
 119 }
 120
 121 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 122                                                  dma_addr_t addr,
 123                                                  unsigned long offset,
 124                                                  size_t size,
 125                                                  enum dma_data_direction dir)
 126 {
 127         const struct dma_map_ops *ops = get_dma_ops(dev);
 128
 129         BUG_ON(!valid_dma_direction(dir));
 130         if (ops->sync_single_for_cpu)
 131                 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
 132         debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
 133 }
 134
 135 static inline void dma_sync_single_range_for_device(struct device *dev,
 136                                                     dma_addr_t addr,
 137                                                     unsigned long offset,
 138                                                     size_t size,
 139                                                     enum dma_data_direction dir)
 140 {
 141         const struct dma_map_ops *ops = get_dma_ops(dev);
 142
 143         BUG_ON(!valid_dma_direction(dir));
 144         if (ops->sync_single_for_device)
 145                 ops->sync_single_for_device(dev, addr + offset, size, dir);
 146         debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
 147 }
 148
 149 static inline void
 150 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 151                     int nelems, enum dma_data_direction dir)
 152 {
 153         struct dma_map_ops *ops = get_dma_ops(dev);
 154
 155         BUG_ON(!valid_dma_direction(dir));
 156         if (ops->sync_sg_for_cpu)
 157                 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
 158         debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 159 }
 160
 161 static inline void
 162 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 163                        int nelems, enum dma_data_direction dir)
 164 {
 165         struct dma_map_ops *ops = get_dma_ops(dev);
 166
 167         BUG_ON(!valid_dma_direction(dir));
 168         if (ops->sync_sg_for_device)
 169                 ops->sync_sg_for_device(dev, sg, nelems, dir);
 170         debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 171
 172 }
 173
 174 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL)
 175 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL)
 176 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL)
 177 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL)
 178
 179 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 180                            void *cpu_addr, dma_addr_t dma_addr, size_t size);
 181
 182 /**
 183  * dma_mmap_attrs - map a coherent DMA allocation into user space
 184  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 185  * @vma: vm_area_struct describing requested user mapping
 186  * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 187  * @handle: device-view address returned from dma_alloc_attrs
 188  * @size: size of memory originally requested in dma_alloc_attrs
 189  * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 190  *
 191  * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 192  * into user space.  The coherent DMA buffer must not be freed by the
 193  * driver until the user space mapping has been released.
 194  */
 195 static inline int
 196 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
 197                dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs)
 198 {
 199         struct dma_map_ops *ops = get_dma_ops(dev);
 200         BUG_ON(!ops);
 201         if (ops->mmap)
 202                 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
 203         return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
 204 }
 205
 206 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL)
 207
 208 static inline int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma,
 209                       void *cpu_addr, dma_addr_t dma_addr, size_t size)
 210 {
 211         DEFINE_DMA_ATTRS(attrs);
 212         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 213         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);
 214 }
 215
 216 int
 217 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 218                        void *cpu_addr, dma_addr_t dma_addr, size_t size);
 219
 220 static inline int
 221 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
 222                       dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs)
 223 {
 224         struct dma_map_ops *ops = get_dma_ops(dev);
 225         BUG_ON(!ops);
 226         if (ops->get_sgtable)
 227                 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
 228                                         attrs);
 229         return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
 230 }
 231
 232 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, NULL)
 233
 234 #endif