arch/x86/include/asm/dma-mapping.h

   1 #ifndef _ASM_X86_DMA_MAPPING_H
   2 #define _ASM_X86_DMA_MAPPING_H
   3
   4 /*
   5  * IOMMU interface. See Documentation/PCI/PCI-DMA-mapping.txt and
   6  * Documentation/DMA-API.txt for documentation.
   7  */
   8
   9 #include <linux/scatterlist.h>
  10 #include <linux/dma-debug.h>
  11 #include <linux/dma-attrs.h>
  12 #include <asm/io.h>
  13 #include <asm/swiotlb.h>
  14 #include <asm-generic/dma-coherent.h>
  15
  16 extern dma_addr_t bad_dma_address;
  17 extern int iommu_merge;
  18 extern struct device x86_dma_fallback_dev;
  19 extern int panic_on_overflow;
  20
  21 extern struct dma_map_ops *dma_ops;
  22
  23 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  24 {
  25 #ifdef CONFIG_X86_32
  26         return dma_ops;
  27 #else
  28         if (unlikely(!dev) || !dev->archdata.dma_ops)
  29                 return dma_ops;
  30         else
  31                 return dev->archdata.dma_ops;
  32 #endif
  33 }
  34
  35 /* Make sure we keep the same behaviour */
  36 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  37 {
  38         struct dma_map_ops *ops = get_dma_ops(dev);
  39         if (ops->mapping_error)
  40                 return ops->mapping_error(dev, dma_addr);
  41
  42         return (dma_addr == bad_dma_address);
  43 }
  44
  45 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  46 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  47 #define dma_is_consistent(d, h) (1)
  48
  49 extern int dma_supported(struct device *hwdev, u64 mask);
  50 extern int dma_set_mask(struct device *dev, u64 mask);
  51
  52 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
  53                                         dma_addr_t *dma_addr, gfp_t flag);
  54
  55 static inline dma_addr_t
  56 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  57                enum dma_data_direction dir)
  58 {
  59         struct dma_map_ops *ops = get_dma_ops(hwdev);
  60         dma_addr_t addr;
  61
  62         BUG_ON(!valid_dma_direction(dir));
  63         addr = ops->map_page(hwdev, virt_to_page(ptr),
  64                              (unsigned long)ptr & ~PAGE_MASK, size,
  65                              dir, NULL);
  66         debug_dma_map_page(hwdev, virt_to_page(ptr),
  67                            (unsigned long)ptr & ~PAGE_MASK, size,
  68                            dir, addr, true);
  69         return addr;
  70 }
  71
  72 static inline void
  73 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
  74                  enum dma_data_direction dir)
  75 {
  76         struct dma_map_ops *ops = get_dma_ops(dev);
  77
  78         BUG_ON(!valid_dma_direction(dir));
  79         if (ops->unmap_page)
  80                 ops->unmap_page(dev, addr, size, dir, NULL);
  81         debug_dma_unmap_page(dev, addr, size, dir, true);
  82 }
  83
  84 static inline int
  85 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
  86            int nents, enum dma_data_direction dir)
  87 {
  88         struct dma_map_ops *ops = get_dma_ops(hwdev);
  89         int ents;
  90
  91         BUG_ON(!valid_dma_direction(dir));
  92         ents = ops->map_sg(hwdev, sg, nents, dir, NULL);
  93         debug_dma_map_sg(hwdev, sg, nents, ents, dir);
  94
  95         return ents;
  96 }
  97
  98 static inline void
  99 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 100              enum dma_data_direction dir)
 101 {
 102         struct dma_map_ops *ops = get_dma_ops(hwdev);
 103
 104         BUG_ON(!valid_dma_direction(dir));
 105         debug_dma_unmap_sg(hwdev, sg, nents, dir);
 106         if (ops->unmap_sg)
 107                 ops->unmap_sg(hwdev, sg, nents, dir, NULL);
 108 }
 109
 110 static inline void
 111 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 112                         size_t size, enum dma_data_direction dir)
 113 {
 114         struct dma_map_ops *ops = get_dma_ops(hwdev);
 115
 116         BUG_ON(!valid_dma_direction(dir));
 117         if (ops->sync_single_for_cpu)
 118                 ops->sync_single_for_cpu(hwdev, dma_handle, size, dir);
 119         debug_dma_sync_single_for_cpu(hwdev, dma_handle, size, dir);
 120         flush_write_buffers();
 121 }
 122
 123 static inline void
 124 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 125                            size_t size, enum dma_data_direction dir)
 126 {
 127         struct dma_map_ops *ops = get_dma_ops(hwdev);
 128
 129         BUG_ON(!valid_dma_direction(dir));
 130         if (ops->sync_single_for_device)
 131                 ops->sync_single_for_device(hwdev, dma_handle, size, dir);
 132         debug_dma_sync_single_for_device(hwdev, dma_handle, size, dir);
 133         flush_write_buffers();
 134 }
 135
 136 static inline void
 137 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 138                               unsigned long offset, size_t size,
 139                               enum dma_data_direction dir)
 140 {
 141         struct dma_map_ops *ops = get_dma_ops(hwdev);
 142
 143         BUG_ON(!valid_dma_direction(dir));
 144         if (ops->sync_single_range_for_cpu)
 145                 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 146                                                size, dir);
 147         debug_dma_sync_single_range_for_cpu(hwdev, dma_handle,
 148                                             offset, size, dir);
 149         flush_write_buffers();
 150 }
 151
 152 static inline void
 153 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 154                                  unsigned long offset, size_t size,
 155                                  enum dma_data_direction dir)
 156 {
 157         struct dma_map_ops *ops = get_dma_ops(hwdev);
 158
 159         BUG_ON(!valid_dma_direction(dir));
 160         if (ops->sync_single_range_for_device)
 161                 ops->sync_single_range_for_device(hwdev, dma_handle,
 162                                                   offset, size, dir);
 163         debug_dma_sync_single_range_for_device(hwdev, dma_handle,
 164                                                offset, size, dir);
 165         flush_write_buffers();
 166 }
 167
 168 static inline void
 169 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 170                     int nelems, enum dma_data_direction dir)
 171 {
 172         struct dma_map_ops *ops = get_dma_ops(hwdev);
 173
 174         BUG_ON(!valid_dma_direction(dir));
 175         if (ops->sync_sg_for_cpu)
 176                 ops->sync_sg_for_cpu(hwdev, sg, nelems, dir);
 177         debug_dma_sync_sg_for_cpu(hwdev, sg, nelems, dir);
 178         flush_write_buffers();
 179 }
 180
 181 static inline void
 182 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 183                        int nelems, enum dma_data_direction dir)
 184 {
 185         struct dma_map_ops *ops = get_dma_ops(hwdev);
 186
 187         BUG_ON(!valid_dma_direction(dir));
 188         if (ops->sync_sg_for_device)
 189                 ops->sync_sg_for_device(hwdev, sg, nelems, dir);
 190         debug_dma_sync_sg_for_device(hwdev, sg, nelems, dir);
 191
 192         flush_write_buffers();
 193 }
 194
 195 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 196                                       size_t offset, size_t size,
 197                                       enum dma_data_direction dir)
 198 {
 199         struct dma_map_ops *ops = get_dma_ops(dev);
 200         dma_addr_t addr;
 201
 202         BUG_ON(!valid_dma_direction(dir));
 203         addr = ops->map_page(dev, page, offset, size, dir, NULL);
 204         debug_dma_map_page(dev, page, offset, size, dir, addr, false);
 205
 206         return addr;
 207 }
 208
 209 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 210                                   size_t size, enum dma_data_direction dir)
 211 {
 212         struct dma_map_ops *ops = get_dma_ops(dev);
 213
 214         BUG_ON(!valid_dma_direction(dir));
 215         if (ops->unmap_page)
 216                 ops->unmap_page(dev, addr, size, dir, NULL);
 217         debug_dma_unmap_page(dev, addr, size, dir, false);
 218 }
 219
 220 static inline void
 221 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 222         enum dma_data_direction dir)
 223 {
 224         flush_write_buffers();
 225 }
 226
 227 static inline int dma_get_cache_alignment(void)
 228 {
 229         /* no easy way to get cache size on all x86, so return the
 230          * maximum possible, to be safe */
 231         return boot_cpu_data.x86_clflush_size;
 232 }
 233
 234 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
 235                                                     gfp_t gfp)
 236 {
 237         unsigned long dma_mask = 0;
 238
 239         dma_mask = dev->coherent_dma_mask;
 240         if (!dma_mask)
 241                 dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
 242
 243         return dma_mask;
 244 }
 245
 246 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
 247 {
 248         unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
 249
 250         if (dma_mask <= DMA_BIT_MASK(24))
 251                 gfp |= GFP_DMA;
 252 #ifdef CONFIG_X86_64
 253         if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
 254                 gfp |= GFP_DMA32;
 255 #endif
 256        return gfp;
 257 }
 258
 259 static inline void *
 260 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 261                 gfp_t gfp)
 262 {
 263         struct dma_map_ops *ops = get_dma_ops(dev);
 264         void *memory;
 265
 266         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 267
 268         if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
 269                 return memory;
 270
 271         if (!dev) {
 272                 dev = &x86_dma_fallback_dev;
 273                 gfp |= GFP_DMA;
 274         }
 275
 276         if (!is_device_dma_capable(dev))
 277                 return NULL;
 278
 279         if (!ops->alloc_coherent)
 280                 return NULL;
 281
 282         memory = ops->alloc_coherent(dev, size, dma_handle,
 283                                      dma_alloc_coherent_gfp_flags(dev, gfp));
 284         debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
 285
 286         return memory;
 287 }
 288
 289 static inline void dma_free_coherent(struct device *dev, size_t size,
 290                                      void *vaddr, dma_addr_t bus)
 291 {
 292         struct dma_map_ops *ops = get_dma_ops(dev);
 293
 294         WARN_ON(irqs_disabled());       /* for portability */
 295
 296         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 297                 return;
 298
 299         debug_dma_free_coherent(dev, size, vaddr, bus);
 300         if (ops->free_coherent)
 301                 ops->free_coherent(dev, size, vaddr, bus);
 302 }
 303
 304 #endif