1 #ifndef _LINUX_DMA_MAPPING_H 2 #define _LINUX_DMA_MAPPING_H 3 4 #include <linux/sizes.h> 5 #include <linux/string.h> 6 #include <linux/device.h> 7 #include <linux/err.h> 8 #include <linux/dma-attrs.h> 9 #include <linux/dma-debug.h> 10 #include <linux/dma-direction.h> 11 #include <linux/scatterlist.h> 12 #include <linux/kmemcheck.h> 13 #include <linux/bug.h> 14 15 /* 16 * A dma_addr_t can hold any valid DMA or bus address for the platform. 17 * It can be given to a device to use as a DMA source or target. A CPU cannot 18 * reference a dma_addr_t directly because there may be translation between 19 * its physical address space and the bus address space. 20 */ 21 struct dma_map_ops { 22 void* (*alloc)(struct device *dev, size_t size, 23 dma_addr_t *dma_handle, gfp_t gfp, 24 struct dma_attrs *attrs); 25 void (*free)(struct device *dev, size_t size, 26 void *vaddr, dma_addr_t dma_handle, 27 struct dma_attrs *attrs); 28 int (*mmap)(struct device *, struct vm_area_struct *, 29 void *, dma_addr_t, size_t, struct dma_attrs *attrs); 30 31 int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *, 32 dma_addr_t, size_t, struct dma_attrs *attrs); 33 34 dma_addr_t (*map_page)(struct device *dev, struct page *page, 35 unsigned long offset, size_t size, 36 enum dma_data_direction dir, 37 struct dma_attrs *attrs); 38 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, 39 size_t size, enum dma_data_direction dir, 40 struct dma_attrs *attrs); 41 /* 42 * map_sg returns 0 on error and a value > 0 on success. 43 * It should never return a value < 0. 44 */ 45 int (*map_sg)(struct device *dev, struct scatterlist *sg, 46 int nents, enum dma_data_direction dir, 47 struct dma_attrs *attrs); 48 void (*unmap_sg)(struct device *dev, 49 struct scatterlist *sg, int nents, 50 enum dma_data_direction dir, 51 struct dma_attrs *attrs); 52 void (*sync_single_for_cpu)(struct device *dev, 53 dma_addr_t dma_handle, size_t size, 54 enum dma_data_direction dir); 55 void (*sync_single_for_device)(struct device *dev, 56 dma_addr_t dma_handle, size_t size, 57 enum dma_data_direction dir); 58 void (*sync_sg_for_cpu)(struct device *dev, 59 struct scatterlist *sg, int nents, 60 enum dma_data_direction dir); 61 void (*sync_sg_for_device)(struct device *dev, 62 struct scatterlist *sg, int nents, 63 enum dma_data_direction dir); 64 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr); 65 int (*dma_supported)(struct device *dev, u64 mask); 66 int (*set_dma_mask)(struct device *dev, u64 mask); 67 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK 68 u64 (*get_required_mask)(struct device *dev); 69 #endif 70 int is_phys; 71 }; 72 73 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) 74 75 #define DMA_MASK_NONE 0x0ULL 76 77 static inline int valid_dma_direction(int dma_direction) 78 { 79 return ((dma_direction == DMA_BIDIRECTIONAL) || 80 (dma_direction == DMA_TO_DEVICE) || 81 (dma_direction == DMA_FROM_DEVICE)); 82 } 83 84 static inline int is_device_dma_capable(struct device *dev) 85 { 86 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; 87 } 88 89 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT 90 /* 91 * These three functions are only for dma allocator. 92 * Don't use them in device drivers. 93 */ 94 int dma_alloc_from_coherent(struct device *dev, ssize_t size, 95 dma_addr_t *dma_handle, void **ret); 96 int dma_release_from_coherent(struct device *dev, int order, void *vaddr); 97 98 int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma, 99 void *cpu_addr, size_t size, int *ret); 100 #else 101 #define dma_alloc_from_coherent(dev, size, handle, ret) (0) 102 #define dma_release_from_coherent(dev, order, vaddr) (0) 103 #define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0) 104 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */ 105 106 #ifdef CONFIG_HAS_DMA 107 #include <asm/dma-mapping.h> 108 #else 109 /* 110 * Define the dma api to allow compilation but not linking of 111 * dma dependent code. Code that depends on the dma-mapping 112 * API needs to set 'depends on HAS_DMA' in its Kconfig 113 */ 114 extern struct dma_map_ops bad_dma_ops; 115 static inline struct dma_map_ops *get_dma_ops(struct device *dev) 116 { 117 return &bad_dma_ops; 118 } 119 #endif 120 121 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr, 122 size_t size, 123 enum dma_data_direction dir, 124 struct dma_attrs *attrs) 125 { 126 struct dma_map_ops *ops = get_dma_ops(dev); 127 dma_addr_t addr; 128 129 kmemcheck_mark_initialized(ptr, size); 130 BUG_ON(!valid_dma_direction(dir)); 131 addr = ops->map_page(dev, virt_to_page(ptr), 132 offset_in_page(ptr), size, 133 dir, attrs); 134 debug_dma_map_page(dev, virt_to_page(ptr), 135 offset_in_page(ptr), size, 136 dir, addr, true); 137 return addr; 138 } 139 140 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, 141 size_t size, 142 enum dma_data_direction dir, 143 struct dma_attrs *attrs) 144 { 145 struct dma_map_ops *ops = get_dma_ops(dev); 146 147 BUG_ON(!valid_dma_direction(dir)); 148 if (ops->unmap_page) 149 ops->unmap_page(dev, addr, size, dir, attrs); 150 debug_dma_unmap_page(dev, addr, size, dir, true); 151 } 152 153 /* 154 * dma_maps_sg_attrs returns 0 on error and > 0 on success. 155 * It should never return a value < 0. 156 */ 157 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, 158 int nents, enum dma_data_direction dir, 159 struct dma_attrs *attrs) 160 { 161 struct dma_map_ops *ops = get_dma_ops(dev); 162 int i, ents; 163 struct scatterlist *s; 164 165 for_each_sg(sg, s, nents, i) 166 kmemcheck_mark_initialized(sg_virt(s), s->length); 167 BUG_ON(!valid_dma_direction(dir)); 168 ents = ops->map_sg(dev, sg, nents, dir, attrs); 169 BUG_ON(ents < 0); 170 debug_dma_map_sg(dev, sg, nents, ents, dir); 171 172 return ents; 173 } 174 175 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, 176 int nents, enum dma_data_direction dir, 177 struct dma_attrs *attrs) 178 { 179 struct dma_map_ops *ops = get_dma_ops(dev); 180 181 BUG_ON(!valid_dma_direction(dir)); 182 debug_dma_unmap_sg(dev, sg, nents, dir); 183 if (ops->unmap_sg) 184 ops->unmap_sg(dev, sg, nents, dir, attrs); 185 } 186 187 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, 188 size_t offset, size_t size, 189 enum dma_data_direction dir) 190 { 191 struct dma_map_ops *ops = get_dma_ops(dev); 192 dma_addr_t addr; 193 194 kmemcheck_mark_initialized(page_address(page) + offset, size); 195 BUG_ON(!valid_dma_direction(dir)); 196 addr = ops->map_page(dev, page, offset, size, dir, NULL); 197 debug_dma_map_page(dev, page, offset, size, dir, addr, false); 198 199 return addr; 200 } 201 202 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr, 203 size_t size, enum dma_data_direction dir) 204 { 205 struct dma_map_ops *ops = get_dma_ops(dev); 206 207 BUG_ON(!valid_dma_direction(dir)); 208 if (ops->unmap_page) 209 ops->unmap_page(dev, addr, size, dir, NULL); 210 debug_dma_unmap_page(dev, addr, size, dir, false); 211 } 212 213 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, 214 size_t size, 215 enum dma_data_direction dir) 216 { 217 struct dma_map_ops *ops = get_dma_ops(dev); 218 219 BUG_ON(!valid_dma_direction(dir)); 220 if (ops->sync_single_for_cpu) 221 ops->sync_single_for_cpu(dev, addr, size, dir); 222 debug_dma_sync_single_for_cpu(dev, addr, size, dir); 223 } 224 225 static inline void dma_sync_single_for_device(struct device *dev, 226 dma_addr_t addr, size_t size, 227 enum dma_data_direction dir) 228 { 229 struct dma_map_ops *ops = get_dma_ops(dev); 230 231 BUG_ON(!valid_dma_direction(dir)); 232 if (ops->sync_single_for_device) 233 ops->sync_single_for_device(dev, addr, size, dir); 234 debug_dma_sync_single_for_device(dev, addr, size, dir); 235 } 236 237 static inline void dma_sync_single_range_for_cpu(struct device *dev, 238 dma_addr_t addr, 239 unsigned long offset, 240 size_t size, 241 enum dma_data_direction dir) 242 { 243 const struct dma_map_ops *ops = get_dma_ops(dev); 244 245 BUG_ON(!valid_dma_direction(dir)); 246 if (ops->sync_single_for_cpu) 247 ops->sync_single_for_cpu(dev, addr + offset, size, dir); 248 debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir); 249 } 250 251 static inline void dma_sync_single_range_for_device(struct device *dev, 252 dma_addr_t addr, 253 unsigned long offset, 254 size_t size, 255 enum dma_data_direction dir) 256 { 257 const struct dma_map_ops *ops = get_dma_ops(dev); 258 259 BUG_ON(!valid_dma_direction(dir)); 260 if (ops->sync_single_for_device) 261 ops->sync_single_for_device(dev, addr + offset, size, dir); 262 debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir); 263 } 264 265 static inline void 266 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, 267 int nelems, enum dma_data_direction dir) 268 { 269 struct dma_map_ops *ops = get_dma_ops(dev); 270 271 BUG_ON(!valid_dma_direction(dir)); 272 if (ops->sync_sg_for_cpu) 273 ops->sync_sg_for_cpu(dev, sg, nelems, dir); 274 debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir); 275 } 276 277 static inline void 278 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, 279 int nelems, enum dma_data_direction dir) 280 { 281 struct dma_map_ops *ops = get_dma_ops(dev); 282 283 BUG_ON(!valid_dma_direction(dir)); 284 if (ops->sync_sg_for_device) 285 ops->sync_sg_for_device(dev, sg, nelems, dir); 286 debug_dma_sync_sg_for_device(dev, sg, nelems, dir); 287 288 } 289 290 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL) 291 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL) 292 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL) 293 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL) 294 295 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, 296 void *cpu_addr, dma_addr_t dma_addr, size_t size); 297 298 void *dma_common_contiguous_remap(struct page *page, size_t size, 299 unsigned long vm_flags, 300 pgprot_t prot, const void *caller); 301 302 void *dma_common_pages_remap(struct page **pages, size_t size, 303 unsigned long vm_flags, pgprot_t prot, 304 const void *caller); 305 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags); 306 307 /** 308 * dma_mmap_attrs - map a coherent DMA allocation into user space 309 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices 310 * @vma: vm_area_struct describing requested user mapping 311 * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs 312 * @handle: device-view address returned from dma_alloc_attrs 313 * @size: size of memory originally requested in dma_alloc_attrs 314 * @attrs: attributes of mapping properties requested in dma_alloc_attrs 315 * 316 * Map a coherent DMA buffer previously allocated by dma_alloc_attrs 317 * into user space. The coherent DMA buffer must not be freed by the 318 * driver until the user space mapping has been released. 319 */ 320 static inline int 321 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, 322 dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs) 323 { 324 struct dma_map_ops *ops = get_dma_ops(dev); 325 BUG_ON(!ops); 326 if (ops->mmap) 327 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs); 328 return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size); 329 } 330 331 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL) 332 333 int 334 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, 335 void *cpu_addr, dma_addr_t dma_addr, size_t size); 336 337 static inline int 338 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr, 339 dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs) 340 { 341 struct dma_map_ops *ops = get_dma_ops(dev); 342 BUG_ON(!ops); 343 if (ops->get_sgtable) 344 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size, 345 attrs); 346 return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size); 347 } 348 349 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, NULL) 350 351 #ifndef arch_dma_alloc_attrs 352 #define arch_dma_alloc_attrs(dev, flag) (true) 353 #endif 354 355 static inline void *dma_alloc_attrs(struct device *dev, size_t size, 356 dma_addr_t *dma_handle, gfp_t flag, 357 struct dma_attrs *attrs) 358 { 359 struct dma_map_ops *ops = get_dma_ops(dev); 360 void *cpu_addr; 361 362 BUG_ON(!ops); 363 364 if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr)) 365 return cpu_addr; 366 367 if (!arch_dma_alloc_attrs(&dev, &flag)) 368 return NULL; 369 if (!ops->alloc) 370 return NULL; 371 372 cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs); 373 debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr); 374 return cpu_addr; 375 } 376 377 static inline void dma_free_attrs(struct device *dev, size_t size, 378 void *cpu_addr, dma_addr_t dma_handle, 379 struct dma_attrs *attrs) 380 { 381 struct dma_map_ops *ops = get_dma_ops(dev); 382 383 BUG_ON(!ops); 384 WARN_ON(irqs_disabled()); 385 386 if (dma_release_from_coherent(dev, get_order(size), cpu_addr)) 387 return; 388 389 if (!ops->free) 390 return; 391 392 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); 393 ops->free(dev, size, cpu_addr, dma_handle, attrs); 394 } 395 396 static inline void *dma_alloc_coherent(struct device *dev, size_t size, 397 dma_addr_t *dma_handle, gfp_t flag) 398 { 399 return dma_alloc_attrs(dev, size, dma_handle, flag, NULL); 400 } 401 402 static inline void dma_free_coherent(struct device *dev, size_t size, 403 void *cpu_addr, dma_addr_t dma_handle) 404 { 405 return dma_free_attrs(dev, size, cpu_addr, dma_handle, NULL); 406 } 407 408 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size, 409 dma_addr_t *dma_handle, gfp_t gfp) 410 { 411 DEFINE_DMA_ATTRS(attrs); 412 413 dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs); 414 return dma_alloc_attrs(dev, size, dma_handle, gfp, &attrs); 415 } 416 417 static inline void dma_free_noncoherent(struct device *dev, size_t size, 418 void *cpu_addr, dma_addr_t dma_handle) 419 { 420 DEFINE_DMA_ATTRS(attrs); 421 422 dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs); 423 dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs); 424 } 425 426 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 427 { 428 debug_dma_mapping_error(dev, dma_addr); 429 430 if (get_dma_ops(dev)->mapping_error) 431 return get_dma_ops(dev)->mapping_error(dev, dma_addr); 432 433 #ifdef DMA_ERROR_CODE 434 return dma_addr == DMA_ERROR_CODE; 435 #else 436 return 0; 437 #endif 438 } 439 440 #ifndef HAVE_ARCH_DMA_SUPPORTED 441 static inline int dma_supported(struct device *dev, u64 mask) 442 { 443 struct dma_map_ops *ops = get_dma_ops(dev); 444 445 if (!ops) 446 return 0; 447 if (!ops->dma_supported) 448 return 1; 449 return ops->dma_supported(dev, mask); 450 } 451 #endif 452 453 #ifndef HAVE_ARCH_DMA_SET_MASK 454 static inline int dma_set_mask(struct device *dev, u64 mask) 455 { 456 struct dma_map_ops *ops = get_dma_ops(dev); 457 458 if (ops->set_dma_mask) 459 return ops->set_dma_mask(dev, mask); 460 461 if (!dev->dma_mask || !dma_supported(dev, mask)) 462 return -EIO; 463 *dev->dma_mask = mask; 464 return 0; 465 } 466 #endif 467 468 static inline u64 dma_get_mask(struct device *dev) 469 { 470 if (dev && dev->dma_mask && *dev->dma_mask) 471 return *dev->dma_mask; 472 return DMA_BIT_MASK(32); 473 } 474 475 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK 476 int dma_set_coherent_mask(struct device *dev, u64 mask); 477 #else 478 static inline int dma_set_coherent_mask(struct device *dev, u64 mask) 479 { 480 if (!dma_supported(dev, mask)) 481 return -EIO; 482 dev->coherent_dma_mask = mask; 483 return 0; 484 } 485 #endif 486 487 /* 488 * Set both the DMA mask and the coherent DMA mask to the same thing. 489 * Note that we don't check the return value from dma_set_coherent_mask() 490 * as the DMA API guarantees that the coherent DMA mask can be set to 491 * the same or smaller than the streaming DMA mask. 492 */ 493 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask) 494 { 495 int rc = dma_set_mask(dev, mask); 496 if (rc == 0) 497 dma_set_coherent_mask(dev, mask); 498 return rc; 499 } 500 501 /* 502 * Similar to the above, except it deals with the case where the device 503 * does not have dev->dma_mask appropriately setup. 504 */ 505 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask) 506 { 507 dev->dma_mask = &dev->coherent_dma_mask; 508 return dma_set_mask_and_coherent(dev, mask); 509 } 510 511 extern u64 dma_get_required_mask(struct device *dev); 512 513 #ifndef arch_setup_dma_ops 514 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, 515 u64 size, struct iommu_ops *iommu, 516 bool coherent) { } 517 #endif 518 519 #ifndef arch_teardown_dma_ops 520 static inline void arch_teardown_dma_ops(struct device *dev) { } 521 #endif 522 523 static inline unsigned int dma_get_max_seg_size(struct device *dev) 524 { 525 if (dev->dma_parms && dev->dma_parms->max_segment_size) 526 return dev->dma_parms->max_segment_size; 527 return SZ_64K; 528 } 529 530 static inline unsigned int dma_set_max_seg_size(struct device *dev, 531 unsigned int size) 532 { 533 if (dev->dma_parms) { 534 dev->dma_parms->max_segment_size = size; 535 return 0; 536 } 537 return -EIO; 538 } 539 540 static inline unsigned long dma_get_seg_boundary(struct device *dev) 541 { 542 if (dev->dma_parms && dev->dma_parms->segment_boundary_mask) 543 return dev->dma_parms->segment_boundary_mask; 544 return DMA_BIT_MASK(32); 545 } 546 547 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) 548 { 549 if (dev->dma_parms) { 550 dev->dma_parms->segment_boundary_mask = mask; 551 return 0; 552 } 553 return -EIO; 554 } 555 556 #ifndef dma_max_pfn 557 static inline unsigned long dma_max_pfn(struct device *dev) 558 { 559 return *dev->dma_mask >> PAGE_SHIFT; 560 } 561 #endif 562 563 static inline void *dma_zalloc_coherent(struct device *dev, size_t size, 564 dma_addr_t *dma_handle, gfp_t flag) 565 { 566 void *ret = dma_alloc_coherent(dev, size, dma_handle, 567 flag | __GFP_ZERO); 568 return ret; 569 } 570 571 #ifdef CONFIG_HAS_DMA 572 static inline int dma_get_cache_alignment(void) 573 { 574 #ifdef ARCH_DMA_MINALIGN 575 return ARCH_DMA_MINALIGN; 576 #endif 577 return 1; 578 } 579 #endif 580 581 /* flags for the coherent memory api */ 582 #define DMA_MEMORY_MAP 0x01 583 #define DMA_MEMORY_IO 0x02 584 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 585 #define DMA_MEMORY_EXCLUSIVE 0x08 586 587 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT 588 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, 589 dma_addr_t device_addr, size_t size, int flags); 590 void dma_release_declared_memory(struct device *dev); 591 void *dma_mark_declared_memory_occupied(struct device *dev, 592 dma_addr_t device_addr, size_t size); 593 #else 594 static inline int 595 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, 596 dma_addr_t device_addr, size_t size, int flags) 597 { 598 return 0; 599 } 600 601 static inline void 602 dma_release_declared_memory(struct device *dev) 603 { 604 } 605 606 static inline void * 607 dma_mark_declared_memory_occupied(struct device *dev, 608 dma_addr_t device_addr, size_t size) 609 { 610 return ERR_PTR(-EBUSY); 611 } 612 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */ 613 614 /* 615 * Managed DMA API 616 */ 617 extern void *dmam_alloc_coherent(struct device *dev, size_t size, 618 dma_addr_t *dma_handle, gfp_t gfp); 619 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, 620 dma_addr_t dma_handle); 621 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, 622 dma_addr_t *dma_handle, gfp_t gfp); 623 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, 624 dma_addr_t dma_handle); 625 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT 626 extern int dmam_declare_coherent_memory(struct device *dev, 627 phys_addr_t phys_addr, 628 dma_addr_t device_addr, size_t size, 629 int flags); 630 extern void dmam_release_declared_memory(struct device *dev); 631 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */ 632 static inline int dmam_declare_coherent_memory(struct device *dev, 633 phys_addr_t phys_addr, dma_addr_t device_addr, 634 size_t size, gfp_t gfp) 635 { 636 return 0; 637 } 638 639 static inline void dmam_release_declared_memory(struct device *dev) 640 { 641 } 642 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */ 643 644 static inline void *dma_alloc_writecombine(struct device *dev, size_t size, 645 dma_addr_t *dma_addr, gfp_t gfp) 646 { 647 DEFINE_DMA_ATTRS(attrs); 648 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); 649 return dma_alloc_attrs(dev, size, dma_addr, gfp, &attrs); 650 } 651 652 static inline void dma_free_writecombine(struct device *dev, size_t size, 653 void *cpu_addr, dma_addr_t dma_addr) 654 { 655 DEFINE_DMA_ATTRS(attrs); 656 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); 657 return dma_free_attrs(dev, size, cpu_addr, dma_addr, &attrs); 658 } 659 660 static inline int dma_mmap_writecombine(struct device *dev, 661 struct vm_area_struct *vma, 662 void *cpu_addr, dma_addr_t dma_addr, 663 size_t size) 664 { 665 DEFINE_DMA_ATTRS(attrs); 666 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); 667 return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs); 668 } 669 670 #ifdef CONFIG_NEED_DMA_MAP_STATE 671 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME 672 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME 673 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME) 674 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL)) 675 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME) 676 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL)) 677 #else 678 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) 679 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) 680 #define dma_unmap_addr(PTR, ADDR_NAME) (0) 681 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0) 682 #define dma_unmap_len(PTR, LEN_NAME) (0) 683 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) 684 #endif 685 686 #endif 687