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 307