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   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 <asm/io.h>
  11 #include <asm/swiotlb.h>
  12 #include <asm-generic/dma-coherent.h>
  13
  14 extern dma_addr_t bad_dma_address;
  15 extern int iommu_merge;
  16 extern struct device x86_dma_fallback_dev;
  17 extern int panic_on_overflow;
  18
  19 struct dma_mapping_ops {
  20         int             (*mapping_error)(struct device *dev,
  21                                          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         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  29                                 size_t size, int direction);
  30         void            (*sync_single_for_cpu)(struct device *hwdev,
  31                                 dma_addr_t dma_handle, size_t size,
  32                                 int direction);
  33         void            (*sync_single_for_device)(struct device *hwdev,
  34                                 dma_addr_t dma_handle, size_t size,
  35                                 int direction);
  36         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  37                                 dma_addr_t dma_handle, unsigned long offset,
  38                                 size_t size, int direction);
  39         void            (*sync_single_range_for_device)(struct device *hwdev,
  40                                 dma_addr_t dma_handle, unsigned long offset,
  41                                 size_t size, int direction);
  42         void            (*sync_sg_for_cpu)(struct device *hwdev,
  43                                 struct scatterlist *sg, int nelems,
  44                                 int direction);
  45         void            (*sync_sg_for_device)(struct device *hwdev,
  46                                 struct scatterlist *sg, int nelems,
  47                                 int direction);
  48         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  49                                 int nents, int direction);
  50         void            (*unmap_sg)(struct device *hwdev,
  51                                 struct scatterlist *sg, int nents,
  52                                 int direction);
  53         int             (*dma_supported)(struct device *hwdev, u64 mask);
  54         int             is_phys;
  55 };
  56
  57 extern struct dma_mapping_ops *dma_ops;
  58
  59 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
  60 {
  61 #ifdef CONFIG_X86_32
  62         return dma_ops;
  63 #else
  64         if (unlikely(!dev) || !dev->archdata.dma_ops)
  65                 return dma_ops;
  66         else
  67                 return dev->archdata.dma_ops;
  68 #endif
  69 }
  70
  71 /* Make sure we keep the same behaviour */
  72 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  73 {
  74         struct dma_mapping_ops *ops = get_dma_ops(dev);
  75         if (ops->mapping_error)
  76                 return ops->mapping_error(dev, dma_addr);
  77
  78         return (dma_addr == bad_dma_address);
  79 }
  80
  81 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  82 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  83 #define dma_is_consistent(d, h) (1)
  84
  85 extern int dma_supported(struct device *hwdev, u64 mask);
  86 extern int dma_set_mask(struct device *dev, u64 mask);
  87
  88 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
  89                                         dma_addr_t *dma_addr, gfp_t flag);
  90
  91 static inline dma_addr_t
  92 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  93                int direction)
  94 {
  95         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
  96
  97         BUG_ON(!valid_dma_direction(direction));
  98         return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
  99 }
 100
 101 static inline void
 102 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
 103                  int direction)
 104 {
 105         struct dma_mapping_ops *ops = get_dma_ops(dev);
 106
 107         BUG_ON(!valid_dma_direction(direction));
 108         if (ops->unmap_single)
 109                 ops->unmap_single(dev, addr, size, direction);
 110 }
 111
 112 static inline int
 113 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 114            int nents, int direction)
 115 {
 116         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 117
 118         BUG_ON(!valid_dma_direction(direction));
 119         return ops->map_sg(hwdev, sg, nents, direction);
 120 }
 121
 122 static inline void
 123 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 124              int direction)
 125 {
 126         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 127
 128         BUG_ON(!valid_dma_direction(direction));
 129         if (ops->unmap_sg)
 130                 ops->unmap_sg(hwdev, sg, nents, direction);
 131 }
 132
 133 static inline void
 134 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 135                         size_t size, int direction)
 136 {
 137         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 138
 139         BUG_ON(!valid_dma_direction(direction));
 140         if (ops->sync_single_for_cpu)
 141                 ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
 142         flush_write_buffers();
 143 }
 144
 145 static inline void
 146 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 147                            size_t size, int direction)
 148 {
 149         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 150
 151         BUG_ON(!valid_dma_direction(direction));
 152         if (ops->sync_single_for_device)
 153                 ops->sync_single_for_device(hwdev, dma_handle, size, direction);
 154         flush_write_buffers();
 155 }
 156
 157 static inline void
 158 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 159                               unsigned long offset, size_t size, int direction)
 160 {
 161         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 162
 163         BUG_ON(!valid_dma_direction(direction));
 164         if (ops->sync_single_range_for_cpu)
 165                 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 166                                                size, direction);
 167         flush_write_buffers();
 168 }
 169
 170 static inline void
 171 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 172                                  unsigned long offset, size_t size,
 173                                  int direction)
 174 {
 175         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 176
 177         BUG_ON(!valid_dma_direction(direction));
 178         if (ops->sync_single_range_for_device)
 179                 ops->sync_single_range_for_device(hwdev, dma_handle,
 180                                                   offset, size, direction);
 181         flush_write_buffers();
 182 }
 183
 184 static inline void
 185 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 186                     int nelems, int direction)
 187 {
 188         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 189
 190         BUG_ON(!valid_dma_direction(direction));
 191         if (ops->sync_sg_for_cpu)
 192                 ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 193         flush_write_buffers();
 194 }
 195
 196 static inline void
 197 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 198                        int nelems, int direction)
 199 {
 200         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 201
 202         BUG_ON(!valid_dma_direction(direction));
 203         if (ops->sync_sg_for_device)
 204                 ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 205
 206         flush_write_buffers();
 207 }
 208
 209 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 210                                       size_t offset, size_t size,
 211                                       int direction)
 212 {
 213         struct dma_mapping_ops *ops = get_dma_ops(dev);
 214
 215         BUG_ON(!valid_dma_direction(direction));
 216         return ops->map_single(dev, page_to_phys(page) + offset,
 217                                size, direction);
 218 }
 219
 220 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 221                                   size_t size, int direction)
 222 {
 223         dma_unmap_single(dev, addr, size, direction);
 224 }
 225
 226 static inline void
 227 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 228         enum dma_data_direction dir)
 229 {
 230         flush_write_buffers();
 231 }
 232
 233 static inline int dma_get_cache_alignment(void)
 234 {
 235         /* no easy way to get cache size on all x86, so return the
 236          * maximum possible, to be safe */
 237         return boot_cpu_data.x86_clflush_size;
 238 }
 239
 240 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
 241                                                     gfp_t gfp)
 242 {
 243         unsigned long dma_mask = 0;
 244
 245         dma_mask = dev->coherent_dma_mask;
 246         if (!dma_mask)
 247                 dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK;
 248
 249         return dma_mask;
 250 }
 251
 252 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
 253 {
 254         unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
 255
 256         if (dma_mask <= DMA_24BIT_MASK)
 257                 gfp |= GFP_DMA;
 258 #ifdef CONFIG_X86_64
 259         if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
 260                 gfp |= GFP_DMA32;
 261 #endif
 262        return gfp;
 263 }
 264
 265 static inline void *
 266 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 267                 gfp_t gfp)
 268 {
 269         struct dma_mapping_ops *ops = get_dma_ops(dev);
 270         void *memory;
 271
 272         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 273
 274         if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
 275                 return memory;
 276
 277         if (!dev) {
 278                 dev = &x86_dma_fallback_dev;
 279                 gfp |= GFP_DMA;
 280         }
 281
 282         if (!is_device_dma_capable(dev))
 283                 return NULL;
 284
 285         if (!ops->alloc_coherent)
 286                 return NULL;
 287
 288         return ops->alloc_coherent(dev, size, dma_handle,
 289                                    dma_alloc_coherent_gfp_flags(dev, gfp));
 290 }
 291
 292 static inline void dma_free_coherent(struct device *dev, size_t size,
 293                                      void *vaddr, dma_addr_t bus)
 294 {
 295         struct dma_mapping_ops *ops = get_dma_ops(dev);
 296
 297         WARN_ON(irqs_disabled());       /* for portability */
 298
 299         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 300                 return;
 301
 302         if (ops->free_coherent)
 303                 ops->free_coherent(dev, size, vaddr, bus);
 304 }
 305
 306 #endif