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 #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 || !cpu_addr)
 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_wc(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 #ifndef dma_alloc_writecombine
 652 #define dma_alloc_writecombine dma_alloc_wc
 653 #endif
 654
 655 static inline void dma_free_wc(struct device *dev, size_t size,
 656                                void *cpu_addr, dma_addr_t dma_addr)
 657 {
 658         DEFINE_DMA_ATTRS(attrs);
 659         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 660         return dma_free_attrs(dev, size, cpu_addr, dma_addr, &attrs);
 661 }
 662 #ifndef dma_free_writecombine
 663 #define dma_free_writecombine dma_free_wc
 664 #endif
 665
 666 static inline int dma_mmap_wc(struct device *dev,
 667                               struct vm_area_struct *vma,
 668                               void *cpu_addr, dma_addr_t dma_addr,
 669                               size_t size)
 670 {
 671         DEFINE_DMA_ATTRS(attrs);
 672         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 673         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);
 674 }
 675 #ifndef dma_mmap_writecombine
 676 #define dma_mmap_writecombine dma_mmap_wc
 677 #endif
 678
 679 #ifdef CONFIG_NEED_DMA_MAP_STATE
 680 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 681 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 682 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 683 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 684 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 685 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 686 #else
 687 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 688 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 689 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 690 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 691 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 692 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 693 #endif
 694
 695 #endif