include/linux/dma-mapping.h

   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 extern struct dma_map_ops dma_noop_ops;
  74
  75 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
  76
  77 #define DMA_MASK_NONE   0x0ULL
  78
  79 static inline int valid_dma_direction(int dma_direction)
  80 {
  81         return ((dma_direction == DMA_BIDIRECTIONAL) ||
  82                 (dma_direction == DMA_TO_DEVICE) ||
  83                 (dma_direction == DMA_FROM_DEVICE));
  84 }
  85
  86 static inline int is_device_dma_capable(struct device *dev)
  87 {
  88         return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
  89 }
  90
  91 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
  92 /*
  93  * These three functions are only for dma allocator.
  94  * Don't use them in device drivers.
  95  */
  96 int dma_alloc_from_coherent(struct device *dev, ssize_t size,
  97                                        dma_addr_t *dma_handle, void **ret);
  98 int dma_release_from_coherent(struct device *dev, int order, void *vaddr);
  99
 100 int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
 101                             void *cpu_addr, size_t size, int *ret);
 102 #else
 103 #define dma_alloc_from_coherent(dev, size, handle, ret) (0)
 104 #define dma_release_from_coherent(dev, order, vaddr) (0)
 105 #define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
 106 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 107
 108 #ifdef CONFIG_HAS_DMA
 109 #include <asm/dma-mapping.h>
 110 #else
 111 /*
 112  * Define the dma api to allow compilation but not linking of
 113  * dma dependent code.  Code that depends on the dma-mapping
 114  * API needs to set 'depends on HAS_DMA' in its Kconfig
 115  */
 116 extern struct dma_map_ops bad_dma_ops;
 117 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 118 {
 119         return &bad_dma_ops;
 120 }
 121 #endif
 122
 123 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
 124                                               size_t size,
 125                                               enum dma_data_direction dir,
 126                                               struct dma_attrs *attrs)
 127 {
 128         struct dma_map_ops *ops = get_dma_ops(dev);
 129         dma_addr_t addr;
 130
 131         kmemcheck_mark_initialized(ptr, size);
 132         BUG_ON(!valid_dma_direction(dir));
 133         addr = ops->map_page(dev, virt_to_page(ptr),
 134                              offset_in_page(ptr), size,
 135                              dir, attrs);
 136         debug_dma_map_page(dev, virt_to_page(ptr),
 137                            offset_in_page(ptr), size,
 138                            dir, addr, true);
 139         return addr;
 140 }
 141
 142 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
 143                                           size_t size,
 144                                           enum dma_data_direction dir,
 145                                           struct dma_attrs *attrs)
 146 {
 147         struct dma_map_ops *ops = get_dma_ops(dev);
 148
 149         BUG_ON(!valid_dma_direction(dir));
 150         if (ops->unmap_page)
 151                 ops->unmap_page(dev, addr, size, dir, attrs);
 152         debug_dma_unmap_page(dev, addr, size, dir, true);
 153 }
 154
 155 /*
 156  * dma_maps_sg_attrs returns 0 on error and > 0 on success.
 157  * It should never return a value < 0.
 158  */
 159 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 160                                    int nents, enum dma_data_direction dir,
 161                                    struct dma_attrs *attrs)
 162 {
 163         struct dma_map_ops *ops = get_dma_ops(dev);
 164         int i, ents;
 165         struct scatterlist *s;
 166
 167         for_each_sg(sg, s, nents, i)
 168                 kmemcheck_mark_initialized(sg_virt(s), s->length);
 169         BUG_ON(!valid_dma_direction(dir));
 170         ents = ops->map_sg(dev, sg, nents, dir, attrs);
 171         BUG_ON(ents < 0);
 172         debug_dma_map_sg(dev, sg, nents, ents, dir);
 173
 174         return ents;
 175 }
 176
 177 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 178                                       int nents, enum dma_data_direction dir,
 179                                       struct dma_attrs *attrs)
 180 {
 181         struct dma_map_ops *ops = get_dma_ops(dev);
 182
 183         BUG_ON(!valid_dma_direction(dir));
 184         debug_dma_unmap_sg(dev, sg, nents, dir);
 185         if (ops->unmap_sg)
 186                 ops->unmap_sg(dev, sg, nents, dir, attrs);
 187 }
 188
 189 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 190                                       size_t offset, size_t size,
 191                                       enum dma_data_direction dir)
 192 {
 193         struct dma_map_ops *ops = get_dma_ops(dev);
 194         dma_addr_t addr;
 195
 196         kmemcheck_mark_initialized(page_address(page) + offset, size);
 197         BUG_ON(!valid_dma_direction(dir));
 198         addr = ops->map_page(dev, page, offset, size, dir, NULL);
 199         debug_dma_map_page(dev, page, offset, size, dir, addr, false);
 200
 201         return addr;
 202 }
 203
 204 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 205                                   size_t size, enum dma_data_direction dir)
 206 {
 207         struct dma_map_ops *ops = get_dma_ops(dev);
 208
 209         BUG_ON(!valid_dma_direction(dir));
 210         if (ops->unmap_page)
 211                 ops->unmap_page(dev, addr, size, dir, NULL);
 212         debug_dma_unmap_page(dev, addr, size, dir, false);
 213 }
 214
 215 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 216                                            size_t size,
 217                                            enum dma_data_direction dir)
 218 {
 219         struct dma_map_ops *ops = get_dma_ops(dev);
 220
 221         BUG_ON(!valid_dma_direction(dir));
 222         if (ops->sync_single_for_cpu)
 223                 ops->sync_single_for_cpu(dev, addr, size, dir);
 224         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 225 }
 226
 227 static inline void dma_sync_single_for_device(struct device *dev,
 228                                               dma_addr_t addr, size_t size,
 229                                               enum dma_data_direction dir)
 230 {
 231         struct dma_map_ops *ops = get_dma_ops(dev);
 232
 233         BUG_ON(!valid_dma_direction(dir));
 234         if (ops->sync_single_for_device)
 235                 ops->sync_single_for_device(dev, addr, size, dir);
 236         debug_dma_sync_single_for_device(dev, addr, size, dir);
 237 }
 238
 239 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 240                                                  dma_addr_t addr,
 241                                                  unsigned long offset,
 242                                                  size_t size,
 243                                                  enum dma_data_direction dir)
 244 {
 245         const struct dma_map_ops *ops = get_dma_ops(dev);
 246
 247         BUG_ON(!valid_dma_direction(dir));
 248         if (ops->sync_single_for_cpu)
 249                 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
 250         debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
 251 }
 252
 253 static inline void dma_sync_single_range_for_device(struct device *dev,
 254                                                     dma_addr_t addr,
 255                                                     unsigned long offset,
 256                                                     size_t size,
 257                                                     enum dma_data_direction dir)
 258 {
 259         const struct dma_map_ops *ops = get_dma_ops(dev);
 260
 261         BUG_ON(!valid_dma_direction(dir));
 262         if (ops->sync_single_for_device)
 263                 ops->sync_single_for_device(dev, addr + offset, size, dir);
 264         debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
 265 }
 266
 267 static inline void
 268 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 269                     int nelems, enum dma_data_direction dir)
 270 {
 271         struct dma_map_ops *ops = get_dma_ops(dev);
 272
 273         BUG_ON(!valid_dma_direction(dir));
 274         if (ops->sync_sg_for_cpu)
 275                 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
 276         debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 277 }
 278
 279 static inline void
 280 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 281                        int nelems, enum dma_data_direction dir)
 282 {
 283         struct dma_map_ops *ops = get_dma_ops(dev);
 284
 285         BUG_ON(!valid_dma_direction(dir));
 286         if (ops->sync_sg_for_device)
 287                 ops->sync_sg_for_device(dev, sg, nelems, dir);
 288         debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 289
 290 }
 291
 292 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL)
 293 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL)
 294 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL)
 295 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL)
 296
 297 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 298                            void *cpu_addr, dma_addr_t dma_addr, size_t size);
 299
 300 void *dma_common_contiguous_remap(struct page *page, size_t size,
 301                         unsigned long vm_flags,
 302                         pgprot_t prot, const void *caller);
 303
 304 void *dma_common_pages_remap(struct page **pages, size_t size,
 305                         unsigned long vm_flags, pgprot_t prot,
 306                         const void *caller);
 307 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
 308
 309 /**
 310  * dma_mmap_attrs - map a coherent DMA allocation into user space
 311  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 312  * @vma: vm_area_struct describing requested user mapping
 313  * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 314  * @handle: device-view address returned from dma_alloc_attrs
 315  * @size: size of memory originally requested in dma_alloc_attrs
 316  * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 317  *
 318  * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 319  * into user space.  The coherent DMA buffer must not be freed by the
 320  * driver until the user space mapping has been released.
 321  */
 322 static inline int
 323 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
 324                dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs)
 325 {
 326         struct dma_map_ops *ops = get_dma_ops(dev);
 327         BUG_ON(!ops);
 328         if (ops->mmap)
 329                 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
 330         return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
 331 }
 332
 333 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL)
 334
 335 int
 336 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 337                        void *cpu_addr, dma_addr_t dma_addr, size_t size);
 338
 339 static inline int
 340 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
 341                       dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs)
 342 {
 343         struct dma_map_ops *ops = get_dma_ops(dev);
 344         BUG_ON(!ops);
 345         if (ops->get_sgtable)
 346                 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
 347                                         attrs);
 348         return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
 349 }
 350
 351 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, NULL)
 352
 353 #ifndef arch_dma_alloc_attrs
 354 #define arch_dma_alloc_attrs(dev, flag) (true)
 355 #endif
 356
 357 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 358                                        dma_addr_t *dma_handle, gfp_t flag,
 359                                        struct dma_attrs *attrs)
 360 {
 361         struct dma_map_ops *ops = get_dma_ops(dev);
 362         void *cpu_addr;
 363
 364         BUG_ON(!ops);
 365
 366         if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr))
 367                 return cpu_addr;
 368
 369         if (!arch_dma_alloc_attrs(&dev, &flag))
 370                 return NULL;
 371         if (!ops->alloc)
 372                 return NULL;
 373
 374         cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
 375         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 376         return cpu_addr;
 377 }
 378
 379 static inline void dma_free_attrs(struct device *dev, size_t size,
 380                                      void *cpu_addr, dma_addr_t dma_handle,
 381                                      struct dma_attrs *attrs)
 382 {
 383         struct dma_map_ops *ops = get_dma_ops(dev);
 384
 385         BUG_ON(!ops);
 386         WARN_ON(irqs_disabled());
 387
 388         if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
 389                 return;
 390
 391         if (!ops->free || !cpu_addr)
 392                 return;
 393
 394         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 395         ops->free(dev, size, cpu_addr, dma_handle, attrs);
 396 }
 397
 398 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 399                 dma_addr_t *dma_handle, gfp_t flag)
 400 {
 401         return dma_alloc_attrs(dev, size, dma_handle, flag, NULL);
 402 }
 403
 404 static inline void dma_free_coherent(struct device *dev, size_t size,
 405                 void *cpu_addr, dma_addr_t dma_handle)
 406 {
 407         return dma_free_attrs(dev, size, cpu_addr, dma_handle, NULL);
 408 }
 409
 410 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 411                 dma_addr_t *dma_handle, gfp_t gfp)
 412 {
 413         DEFINE_DMA_ATTRS(attrs);
 414
 415         dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
 416         return dma_alloc_attrs(dev, size, dma_handle, gfp, &attrs);
 417 }
 418
 419 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 420                 void *cpu_addr, dma_addr_t dma_handle)
 421 {
 422         DEFINE_DMA_ATTRS(attrs);
 423
 424         dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
 425         dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
 426 }
 427
 428 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 429 {
 430         debug_dma_mapping_error(dev, dma_addr);
 431
 432         if (get_dma_ops(dev)->mapping_error)
 433                 return get_dma_ops(dev)->mapping_error(dev, dma_addr);
 434
 435 #ifdef DMA_ERROR_CODE
 436         return dma_addr == DMA_ERROR_CODE;
 437 #else
 438         return 0;
 439 #endif
 440 }
 441
 442 #ifndef HAVE_ARCH_DMA_SUPPORTED
 443 static inline int dma_supported(struct device *dev, u64 mask)
 444 {
 445         struct dma_map_ops *ops = get_dma_ops(dev);
 446
 447         if (!ops)
 448                 return 0;
 449         if (!ops->dma_supported)
 450                 return 1;
 451         return ops->dma_supported(dev, mask);
 452 }
 453 #endif
 454
 455 #ifndef HAVE_ARCH_DMA_SET_MASK
 456 static inline int dma_set_mask(struct device *dev, u64 mask)
 457 {
 458         struct dma_map_ops *ops = get_dma_ops(dev);
 459
 460         if (ops->set_dma_mask)
 461                 return ops->set_dma_mask(dev, mask);
 462
 463         if (!dev->dma_mask || !dma_supported(dev, mask))
 464                 return -EIO;
 465         *dev->dma_mask = mask;
 466         return 0;
 467 }
 468 #endif
 469
 470 static inline u64 dma_get_mask(struct device *dev)
 471 {
 472         if (dev && dev->dma_mask && *dev->dma_mask)
 473                 return *dev->dma_mask;
 474         return DMA_BIT_MASK(32);
 475 }
 476
 477 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
 478 int dma_set_coherent_mask(struct device *dev, u64 mask);
 479 #else
 480 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
 481 {
 482         if (!dma_supported(dev, mask))
 483                 return -EIO;
 484         dev->coherent_dma_mask = mask;
 485         return 0;
 486 }
 487 #endif
 488
 489 /*
 490  * Set both the DMA mask and the coherent DMA mask to the same thing.
 491  * Note that we don't check the return value from dma_set_coherent_mask()
 492  * as the DMA API guarantees that the coherent DMA mask can be set to
 493  * the same or smaller than the streaming DMA mask.
 494  */
 495 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 496 {
 497         int rc = dma_set_mask(dev, mask);
 498         if (rc == 0)
 499                 dma_set_coherent_mask(dev, mask);
 500         return rc;
 501 }
 502
 503 /*
 504  * Similar to the above, except it deals with the case where the device
 505  * does not have dev->dma_mask appropriately setup.
 506  */
 507 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 508 {
 509         dev->dma_mask = &dev->coherent_dma_mask;
 510         return dma_set_mask_and_coherent(dev, mask);
 511 }
 512
 513 extern u64 dma_get_required_mask(struct device *dev);
 514
 515 #ifndef arch_setup_dma_ops
 516 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 517                                       u64 size, struct iommu_ops *iommu,
 518                                       bool coherent) { }
 519 #endif
 520
 521 #ifndef arch_teardown_dma_ops
 522 static inline void arch_teardown_dma_ops(struct device *dev) { }
 523 #endif
 524
 525 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 526 {
 527         if (dev->dma_parms && dev->dma_parms->max_segment_size)
 528                 return dev->dma_parms->max_segment_size;
 529         return SZ_64K;
 530 }
 531
 532 static inline unsigned int dma_set_max_seg_size(struct device *dev,
 533                                                 unsigned int size)
 534 {
 535         if (dev->dma_parms) {
 536                 dev->dma_parms->max_segment_size = size;
 537                 return 0;
 538         }
 539         return -EIO;
 540 }
 541
 542 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 543 {
 544         if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
 545                 return dev->dma_parms->segment_boundary_mask;
 546         return DMA_BIT_MASK(32);
 547 }
 548
 549 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 550 {
 551         if (dev->dma_parms) {
 552                 dev->dma_parms->segment_boundary_mask = mask;
 553                 return 0;
 554         }
 555         return -EIO;
 556 }
 557
 558 #ifndef dma_max_pfn
 559 static inline unsigned long dma_max_pfn(struct device *dev)
 560 {
 561         return *dev->dma_mask >> PAGE_SHIFT;
 562 }
 563 #endif
 564
 565 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 566                                         dma_addr_t *dma_handle, gfp_t flag)
 567 {
 568         void *ret = dma_alloc_coherent(dev, size, dma_handle,
 569                                        flag | __GFP_ZERO);
 570         return ret;
 571 }
 572
 573 #ifdef CONFIG_HAS_DMA
 574 static inline int dma_get_cache_alignment(void)
 575 {
 576 #ifdef ARCH_DMA_MINALIGN
 577         return ARCH_DMA_MINALIGN;
 578 #endif
 579         return 1;
 580 }
 581 #endif
 582
 583 /* flags for the coherent memory api */
 584 #define DMA_MEMORY_MAP                  0x01
 585 #define DMA_MEMORY_IO                   0x02
 586 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
 587 #define DMA_MEMORY_EXCLUSIVE            0x08
 588
 589 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 590 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 591                                 dma_addr_t device_addr, size_t size, int flags);
 592 void dma_release_declared_memory(struct device *dev);
 593 void *dma_mark_declared_memory_occupied(struct device *dev,
 594                                         dma_addr_t device_addr, size_t size);
 595 #else
 596 static inline int
 597 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 598                             dma_addr_t device_addr, size_t size, int flags)
 599 {
 600         return 0;
 601 }
 602
 603 static inline void
 604 dma_release_declared_memory(struct device *dev)
 605 {
 606 }
 607
 608 static inline void *
 609 dma_mark_declared_memory_occupied(struct device *dev,
 610                                   dma_addr_t device_addr, size_t size)
 611 {
 612         return ERR_PTR(-EBUSY);
 613 }
 614 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 615
 616 /*
 617  * Managed DMA API
 618  */
 619 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 620                                  dma_addr_t *dma_handle, gfp_t gfp);
 621 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 622                                dma_addr_t dma_handle);
 623 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
 624                                     dma_addr_t *dma_handle, gfp_t gfp);
 625 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 626                                   dma_addr_t dma_handle);
 627 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 628 extern int dmam_declare_coherent_memory(struct device *dev,
 629                                         phys_addr_t phys_addr,
 630                                         dma_addr_t device_addr, size_t size,
 631                                         int flags);
 632 extern void dmam_release_declared_memory(struct device *dev);
 633 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 634 static inline int dmam_declare_coherent_memory(struct device *dev,
 635                                 phys_addr_t phys_addr, dma_addr_t device_addr,
 636                                 size_t size, gfp_t gfp)
 637 {
 638         return 0;
 639 }
 640
 641 static inline void dmam_release_declared_memory(struct device *dev)
 642 {
 643 }
 644 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 645
 646 static inline void *dma_alloc_wc(struct device *dev, size_t size,
 647                                  dma_addr_t *dma_addr, gfp_t gfp)
 648 {
 649         DEFINE_DMA_ATTRS(attrs);
 650         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 651         return dma_alloc_attrs(dev, size, dma_addr, gfp, &attrs);
 652 }
 653 #ifndef dma_alloc_writecombine
 654 #define dma_alloc_writecombine dma_alloc_wc
 655 #endif
 656
 657 static inline void dma_free_wc(struct device *dev, size_t size,
 658                                void *cpu_addr, dma_addr_t dma_addr)
 659 {
 660         DEFINE_DMA_ATTRS(attrs);
 661         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 662         return dma_free_attrs(dev, size, cpu_addr, dma_addr, &attrs);
 663 }
 664 #ifndef dma_free_writecombine
 665 #define dma_free_writecombine dma_free_wc
 666 #endif
 667
 668 static inline int dma_mmap_wc(struct device *dev,
 669                               struct vm_area_struct *vma,
 670                               void *cpu_addr, dma_addr_t dma_addr,
 671                               size_t size)
 672 {
 673         DEFINE_DMA_ATTRS(attrs);
 674         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 675         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);
 676 }
 677 #ifndef dma_mmap_writecombine
 678 #define dma_mmap_writecombine dma_mmap_wc
 679 #endif
 680
 681 #ifdef CONFIG_NEED_DMA_MAP_STATE
 682 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 683 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 684 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 685 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 686 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 687 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 688 #else
 689 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 690 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 691 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 692 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 693 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 694 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 695 #endif
 696
 697 #endif