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-debug.h>
   9 #include <linux/dma-direction.h>
  10 #include <linux/scatterlist.h>
  11 #include <linux/kmemcheck.h>
  12 #include <linux/bug.h>
  13
  14 /**
  15  * List of possible attributes associated with a DMA mapping. The semantics
  16  * of each attribute should be defined in Documentation/DMA-attributes.txt.
  17  *
  18  * DMA_ATTR_WRITE_BARRIER: DMA to a memory region with this attribute
  19  * forces all pending DMA writes to complete.
  20  */
  21 #define DMA_ATTR_WRITE_BARRIER          (1UL << 0)
  22 /*
  23  * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping
  24  * may be weakly ordered, that is that reads and writes may pass each other.
  25  */
  26 #define DMA_ATTR_WEAK_ORDERING          (1UL << 1)
  27 /*
  28  * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be
  29  * buffered to improve performance.
  30  */
  31 #define DMA_ATTR_WRITE_COMBINE          (1UL << 2)
  32 /*
  33  * DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either
  34  * consistent or non-consistent memory as it sees fit.
  35  */
  36 #define DMA_ATTR_NON_CONSISTENT         (1UL << 3)
  37 /*
  38  * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
  39  * virtual mapping for the allocated buffer.
  40  */
  41 #define DMA_ATTR_NO_KERNEL_MAPPING      (1UL << 4)
  42 /*
  43  * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of
  44  * the CPU cache for the given buffer assuming that it has been already
  45  * transferred to 'device' domain.
  46  */
  47 #define DMA_ATTR_SKIP_CPU_SYNC          (1UL << 5)
  48 /*
  49  * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer
  50  * in physical memory.
  51  */
  52 #define DMA_ATTR_FORCE_CONTIGUOUS       (1UL << 6)
  53 /*
  54  * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem
  55  * that it's probably not worth the time to try to allocate memory to in a way
  56  * that gives better TLB efficiency.
  57  */
  58 #define DMA_ATTR_ALLOC_SINGLE_PAGES     (1UL << 7)
  59
  60 /*
  61  * A dma_addr_t can hold any valid DMA or bus address for the platform.
  62  * It can be given to a device to use as a DMA source or target.  A CPU cannot
  63  * reference a dma_addr_t directly because there may be translation between
  64  * its physical address space and the bus address space.
  65  */
  66 struct dma_map_ops {
  67         void* (*alloc)(struct device *dev, size_t size,
  68                                 dma_addr_t *dma_handle, gfp_t gfp,
  69                                 unsigned long attrs);
  70         void (*free)(struct device *dev, size_t size,
  71                               void *vaddr, dma_addr_t dma_handle,
  72                               unsigned long attrs);
  73         int (*mmap)(struct device *, struct vm_area_struct *,
  74                           void *, dma_addr_t, size_t,
  75                           unsigned long attrs);
  76
  77         int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
  78                            dma_addr_t, size_t, unsigned long attrs);
  79
  80         dma_addr_t (*map_page)(struct device *dev, struct page *page,
  81                                unsigned long offset, size_t size,
  82                                enum dma_data_direction dir,
  83                                unsigned long attrs);
  84         void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
  85                            size_t size, enum dma_data_direction dir,
  86                            unsigned long attrs);
  87         /*
  88          * map_sg returns 0 on error and a value > 0 on success.
  89          * It should never return a value < 0.
  90          */
  91         int (*map_sg)(struct device *dev, struct scatterlist *sg,
  92                       int nents, enum dma_data_direction dir,
  93                       unsigned long attrs);
  94         void (*unmap_sg)(struct device *dev,
  95                          struct scatterlist *sg, int nents,
  96                          enum dma_data_direction dir,
  97                          unsigned long attrs);
  98         void (*sync_single_for_cpu)(struct device *dev,
  99                                     dma_addr_t dma_handle, size_t size,
 100                                     enum dma_data_direction dir);
 101         void (*sync_single_for_device)(struct device *dev,
 102                                        dma_addr_t dma_handle, size_t size,
 103                                        enum dma_data_direction dir);
 104         void (*sync_sg_for_cpu)(struct device *dev,
 105                                 struct scatterlist *sg, int nents,
 106                                 enum dma_data_direction dir);
 107         void (*sync_sg_for_device)(struct device *dev,
 108                                    struct scatterlist *sg, int nents,
 109                                    enum dma_data_direction dir);
 110         int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
 111         int (*dma_supported)(struct device *dev, u64 mask);
 112         int (*set_dma_mask)(struct device *dev, u64 mask);
 113 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 114         u64 (*get_required_mask)(struct device *dev);
 115 #endif
 116         int is_phys;
 117 };
 118
 119 extern struct dma_map_ops dma_noop_ops;
 120
 121 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
 122
 123 #define DMA_MASK_NONE   0x0ULL
 124
 125 static inline int valid_dma_direction(int dma_direction)
 126 {
 127         return ((dma_direction == DMA_BIDIRECTIONAL) ||
 128                 (dma_direction == DMA_TO_DEVICE) ||
 129                 (dma_direction == DMA_FROM_DEVICE));
 130 }
 131
 132 static inline int is_device_dma_capable(struct device *dev)
 133 {
 134         return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
 135 }
 136
 137 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 138 /*
 139  * These three functions are only for dma allocator.
 140  * Don't use them in device drivers.
 141  */
 142 int dma_alloc_from_coherent(struct device *dev, ssize_t size,
 143                                        dma_addr_t *dma_handle, void **ret);
 144 int dma_release_from_coherent(struct device *dev, int order, void *vaddr);
 145
 146 int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
 147                             void *cpu_addr, size_t size, int *ret);
 148 #else
 149 #define dma_alloc_from_coherent(dev, size, handle, ret) (0)
 150 #define dma_release_from_coherent(dev, order, vaddr) (0)
 151 #define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
 152 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 153
 154 #ifdef CONFIG_HAS_DMA
 155 #include <asm/dma-mapping.h>
 156 #else
 157 /*
 158  * Define the dma api to allow compilation but not linking of
 159  * dma dependent code.  Code that depends on the dma-mapping
 160  * API needs to set 'depends on HAS_DMA' in its Kconfig
 161  */
 162 extern struct dma_map_ops bad_dma_ops;
 163 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 164 {
 165         return &bad_dma_ops;
 166 }
 167 #endif
 168
 169 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
 170                                               size_t size,
 171                                               enum dma_data_direction dir,
 172                                               unsigned long attrs)
 173 {
 174         struct dma_map_ops *ops = get_dma_ops(dev);
 175         dma_addr_t addr;
 176
 177         kmemcheck_mark_initialized(ptr, size);
 178         BUG_ON(!valid_dma_direction(dir));
 179         addr = ops->map_page(dev, virt_to_page(ptr),
 180                              offset_in_page(ptr), size,
 181                              dir, attrs);
 182         debug_dma_map_page(dev, virt_to_page(ptr),
 183                            offset_in_page(ptr), size,
 184                            dir, addr, true);
 185         return addr;
 186 }
 187
 188 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
 189                                           size_t size,
 190                                           enum dma_data_direction dir,
 191                                           unsigned long attrs)
 192 {
 193         struct dma_map_ops *ops = get_dma_ops(dev);
 194
 195         BUG_ON(!valid_dma_direction(dir));
 196         if (ops->unmap_page)
 197                 ops->unmap_page(dev, addr, size, dir, attrs);
 198         debug_dma_unmap_page(dev, addr, size, dir, true);
 199 }
 200
 201 /*
 202  * dma_maps_sg_attrs returns 0 on error and > 0 on success.
 203  * It should never return a value < 0.
 204  */
 205 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 206                                    int nents, enum dma_data_direction dir,
 207                                    unsigned long attrs)
 208 {
 209         struct dma_map_ops *ops = get_dma_ops(dev);
 210         int i, ents;
 211         struct scatterlist *s;
 212
 213         for_each_sg(sg, s, nents, i)
 214                 kmemcheck_mark_initialized(sg_virt(s), s->length);
 215         BUG_ON(!valid_dma_direction(dir));
 216         ents = ops->map_sg(dev, sg, nents, dir, attrs);
 217         BUG_ON(ents < 0);
 218         debug_dma_map_sg(dev, sg, nents, ents, dir);
 219
 220         return ents;
 221 }
 222
 223 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 224                                       int nents, enum dma_data_direction dir,
 225                                       unsigned long attrs)
 226 {
 227         struct dma_map_ops *ops = get_dma_ops(dev);
 228
 229         BUG_ON(!valid_dma_direction(dir));
 230         debug_dma_unmap_sg(dev, sg, nents, dir);
 231         if (ops->unmap_sg)
 232                 ops->unmap_sg(dev, sg, nents, dir, attrs);
 233 }
 234
 235 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 236                                       size_t offset, size_t size,
 237                                       enum dma_data_direction dir)
 238 {
 239         struct dma_map_ops *ops = get_dma_ops(dev);
 240         dma_addr_t addr;
 241
 242         kmemcheck_mark_initialized(page_address(page) + offset, size);
 243         BUG_ON(!valid_dma_direction(dir));
 244         addr = ops->map_page(dev, page, offset, size, dir, 0);
 245         debug_dma_map_page(dev, page, offset, size, dir, addr, false);
 246
 247         return addr;
 248 }
 249
 250 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 251                                   size_t size, enum dma_data_direction dir)
 252 {
 253         struct dma_map_ops *ops = get_dma_ops(dev);
 254
 255         BUG_ON(!valid_dma_direction(dir));
 256         if (ops->unmap_page)
 257                 ops->unmap_page(dev, addr, size, dir, 0);
 258         debug_dma_unmap_page(dev, addr, size, dir, false);
 259 }
 260
 261 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 262                                            size_t size,
 263                                            enum dma_data_direction dir)
 264 {
 265         struct dma_map_ops *ops = get_dma_ops(dev);
 266
 267         BUG_ON(!valid_dma_direction(dir));
 268         if (ops->sync_single_for_cpu)
 269                 ops->sync_single_for_cpu(dev, addr, size, dir);
 270         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 271 }
 272
 273 static inline void dma_sync_single_for_device(struct device *dev,
 274                                               dma_addr_t addr, size_t size,
 275                                               enum dma_data_direction dir)
 276 {
 277         struct dma_map_ops *ops = get_dma_ops(dev);
 278
 279         BUG_ON(!valid_dma_direction(dir));
 280         if (ops->sync_single_for_device)
 281                 ops->sync_single_for_device(dev, addr, size, dir);
 282         debug_dma_sync_single_for_device(dev, addr, size, dir);
 283 }
 284
 285 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 286                                                  dma_addr_t addr,
 287                                                  unsigned long offset,
 288                                                  size_t size,
 289                                                  enum dma_data_direction dir)
 290 {
 291         const struct dma_map_ops *ops = get_dma_ops(dev);
 292
 293         BUG_ON(!valid_dma_direction(dir));
 294         if (ops->sync_single_for_cpu)
 295                 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
 296         debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
 297 }
 298
 299 static inline void dma_sync_single_range_for_device(struct device *dev,
 300                                                     dma_addr_t addr,
 301                                                     unsigned long offset,
 302                                                     size_t size,
 303                                                     enum dma_data_direction dir)
 304 {
 305         const struct dma_map_ops *ops = get_dma_ops(dev);
 306
 307         BUG_ON(!valid_dma_direction(dir));
 308         if (ops->sync_single_for_device)
 309                 ops->sync_single_for_device(dev, addr + offset, size, dir);
 310         debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
 311 }
 312
 313 static inline void
 314 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 315                     int nelems, enum dma_data_direction dir)
 316 {
 317         struct dma_map_ops *ops = get_dma_ops(dev);
 318
 319         BUG_ON(!valid_dma_direction(dir));
 320         if (ops->sync_sg_for_cpu)
 321                 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
 322         debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 323 }
 324
 325 static inline void
 326 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 327                        int nelems, enum dma_data_direction dir)
 328 {
 329         struct dma_map_ops *ops = get_dma_ops(dev);
 330
 331         BUG_ON(!valid_dma_direction(dir));
 332         if (ops->sync_sg_for_device)
 333                 ops->sync_sg_for_device(dev, sg, nelems, dir);
 334         debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 335
 336 }
 337
 338 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
 339 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
 340 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
 341 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
 342
 343 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 344                            void *cpu_addr, dma_addr_t dma_addr, size_t size);
 345
 346 void *dma_common_contiguous_remap(struct page *page, size_t size,
 347                         unsigned long vm_flags,
 348                         pgprot_t prot, const void *caller);
 349
 350 void *dma_common_pages_remap(struct page **pages, size_t size,
 351                         unsigned long vm_flags, pgprot_t prot,
 352                         const void *caller);
 353 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
 354
 355 /**
 356  * dma_mmap_attrs - map a coherent DMA allocation into user space
 357  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 358  * @vma: vm_area_struct describing requested user mapping
 359  * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 360  * @handle: device-view address returned from dma_alloc_attrs
 361  * @size: size of memory originally requested in dma_alloc_attrs
 362  * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 363  *
 364  * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 365  * into user space.  The coherent DMA buffer must not be freed by the
 366  * driver until the user space mapping has been released.
 367  */
 368 static inline int
 369 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
 370                dma_addr_t dma_addr, size_t size, unsigned long attrs)
 371 {
 372         struct dma_map_ops *ops = get_dma_ops(dev);
 373         BUG_ON(!ops);
 374         if (ops->mmap)
 375                 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
 376         return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
 377 }
 378
 379 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
 380
 381 int
 382 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 383                        void *cpu_addr, dma_addr_t dma_addr, size_t size);
 384
 385 static inline int
 386 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
 387                       dma_addr_t dma_addr, size_t size,
 388                       unsigned long attrs)
 389 {
 390         struct dma_map_ops *ops = get_dma_ops(dev);
 391         BUG_ON(!ops);
 392         if (ops->get_sgtable)
 393                 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
 394                                         attrs);
 395         return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
 396 }
 397
 398 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
 399
 400 #ifndef arch_dma_alloc_attrs
 401 #define arch_dma_alloc_attrs(dev, flag) (true)
 402 #endif
 403
 404 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 405                                        dma_addr_t *dma_handle, gfp_t flag,
 406                                        unsigned long attrs)
 407 {
 408         struct dma_map_ops *ops = get_dma_ops(dev);
 409         void *cpu_addr;
 410
 411         BUG_ON(!ops);
 412
 413         if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr))
 414                 return cpu_addr;
 415
 416         if (!arch_dma_alloc_attrs(&dev, &flag))
 417                 return NULL;
 418         if (!ops->alloc)
 419                 return NULL;
 420
 421         cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
 422         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 423         return cpu_addr;
 424 }
 425
 426 static inline void dma_free_attrs(struct device *dev, size_t size,
 427                                      void *cpu_addr, dma_addr_t dma_handle,
 428                                      unsigned long attrs)
 429 {
 430         struct dma_map_ops *ops = get_dma_ops(dev);
 431
 432         BUG_ON(!ops);
 433         WARN_ON(irqs_disabled());
 434
 435         if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
 436                 return;
 437
 438         if (!ops->free || !cpu_addr)
 439                 return;
 440
 441         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 442         ops->free(dev, size, cpu_addr, dma_handle, attrs);
 443 }
 444
 445 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 446                 dma_addr_t *dma_handle, gfp_t flag)
 447 {
 448         return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
 449 }
 450
 451 static inline void dma_free_coherent(struct device *dev, size_t size,
 452                 void *cpu_addr, dma_addr_t dma_handle)
 453 {
 454         return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
 455 }
 456
 457 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 458                 dma_addr_t *dma_handle, gfp_t gfp)
 459 {
 460         return dma_alloc_attrs(dev, size, dma_handle, gfp,
 461                                DMA_ATTR_NON_CONSISTENT);
 462 }
 463
 464 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 465                 void *cpu_addr, dma_addr_t dma_handle)
 466 {
 467         dma_free_attrs(dev, size, cpu_addr, dma_handle,
 468                        DMA_ATTR_NON_CONSISTENT);
 469 }
 470
 471 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 472 {
 473         debug_dma_mapping_error(dev, dma_addr);
 474
 475         if (get_dma_ops(dev)->mapping_error)
 476                 return get_dma_ops(dev)->mapping_error(dev, dma_addr);
 477
 478 #ifdef DMA_ERROR_CODE
 479         return dma_addr == DMA_ERROR_CODE;
 480 #else
 481         return 0;
 482 #endif
 483 }
 484
 485 #ifndef HAVE_ARCH_DMA_SUPPORTED
 486 static inline int dma_supported(struct device *dev, u64 mask)
 487 {
 488         struct dma_map_ops *ops = get_dma_ops(dev);
 489
 490         if (!ops)
 491                 return 0;
 492         if (!ops->dma_supported)
 493                 return 1;
 494         return ops->dma_supported(dev, mask);
 495 }
 496 #endif
 497
 498 #ifndef HAVE_ARCH_DMA_SET_MASK
 499 static inline int dma_set_mask(struct device *dev, u64 mask)
 500 {
 501         struct dma_map_ops *ops = get_dma_ops(dev);
 502
 503         if (ops->set_dma_mask)
 504                 return ops->set_dma_mask(dev, mask);
 505
 506         if (!dev->dma_mask || !dma_supported(dev, mask))
 507                 return -EIO;
 508         *dev->dma_mask = mask;
 509         return 0;
 510 }
 511 #endif
 512
 513 static inline u64 dma_get_mask(struct device *dev)
 514 {
 515         if (dev && dev->dma_mask && *dev->dma_mask)
 516                 return *dev->dma_mask;
 517         return DMA_BIT_MASK(32);
 518 }
 519
 520 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
 521 int dma_set_coherent_mask(struct device *dev, u64 mask);
 522 #else
 523 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
 524 {
 525         if (!dma_supported(dev, mask))
 526                 return -EIO;
 527         dev->coherent_dma_mask = mask;
 528         return 0;
 529 }
 530 #endif
 531
 532 /*
 533  * Set both the DMA mask and the coherent DMA mask to the same thing.
 534  * Note that we don't check the return value from dma_set_coherent_mask()
 535  * as the DMA API guarantees that the coherent DMA mask can be set to
 536  * the same or smaller than the streaming DMA mask.
 537  */
 538 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 539 {
 540         int rc = dma_set_mask(dev, mask);
 541         if (rc == 0)
 542                 dma_set_coherent_mask(dev, mask);
 543         return rc;
 544 }
 545
 546 /*
 547  * Similar to the above, except it deals with the case where the device
 548  * does not have dev->dma_mask appropriately setup.
 549  */
 550 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 551 {
 552         dev->dma_mask = &dev->coherent_dma_mask;
 553         return dma_set_mask_and_coherent(dev, mask);
 554 }
 555
 556 extern u64 dma_get_required_mask(struct device *dev);
 557
 558 #ifndef arch_setup_dma_ops
 559 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 560                                       u64 size, const struct iommu_ops *iommu,
 561                                       bool coherent) { }
 562 #endif
 563
 564 #ifndef arch_teardown_dma_ops
 565 static inline void arch_teardown_dma_ops(struct device *dev) { }
 566 #endif
 567
 568 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 569 {
 570         if (dev->dma_parms && dev->dma_parms->max_segment_size)
 571                 return dev->dma_parms->max_segment_size;
 572         return SZ_64K;
 573 }
 574
 575 static inline unsigned int dma_set_max_seg_size(struct device *dev,
 576                                                 unsigned int size)
 577 {
 578         if (dev->dma_parms) {
 579                 dev->dma_parms->max_segment_size = size;
 580                 return 0;
 581         }
 582         return -EIO;
 583 }
 584
 585 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 586 {
 587         if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
 588                 return dev->dma_parms->segment_boundary_mask;
 589         return DMA_BIT_MASK(32);
 590 }
 591
 592 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 593 {
 594         if (dev->dma_parms) {
 595                 dev->dma_parms->segment_boundary_mask = mask;
 596                 return 0;
 597         }
 598         return -EIO;
 599 }
 600
 601 #ifndef dma_max_pfn
 602 static inline unsigned long dma_max_pfn(struct device *dev)
 603 {
 604         return *dev->dma_mask >> PAGE_SHIFT;
 605 }
 606 #endif
 607
 608 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 609                                         dma_addr_t *dma_handle, gfp_t flag)
 610 {
 611         void *ret = dma_alloc_coherent(dev, size, dma_handle,
 612                                        flag | __GFP_ZERO);
 613         return ret;
 614 }
 615
 616 #ifdef CONFIG_HAS_DMA
 617 static inline int dma_get_cache_alignment(void)
 618 {
 619 #ifdef ARCH_DMA_MINALIGN
 620         return ARCH_DMA_MINALIGN;
 621 #endif
 622         return 1;
 623 }
 624 #endif
 625
 626 /* flags for the coherent memory api */
 627 #define DMA_MEMORY_MAP                  0x01
 628 #define DMA_MEMORY_IO                   0x02
 629 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
 630 #define DMA_MEMORY_EXCLUSIVE            0x08
 631
 632 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 633 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 634                                 dma_addr_t device_addr, size_t size, int flags);
 635 void dma_release_declared_memory(struct device *dev);
 636 void *dma_mark_declared_memory_occupied(struct device *dev,
 637                                         dma_addr_t device_addr, size_t size);
 638 #else
 639 static inline int
 640 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 641                             dma_addr_t device_addr, size_t size, int flags)
 642 {
 643         return 0;
 644 }
 645
 646 static inline void
 647 dma_release_declared_memory(struct device *dev)
 648 {
 649 }
 650
 651 static inline void *
 652 dma_mark_declared_memory_occupied(struct device *dev,
 653                                   dma_addr_t device_addr, size_t size)
 654 {
 655         return ERR_PTR(-EBUSY);
 656 }
 657 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 658
 659 /*
 660  * Managed DMA API
 661  */
 662 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 663                                  dma_addr_t *dma_handle, gfp_t gfp);
 664 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 665                                dma_addr_t dma_handle);
 666 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
 667                                     dma_addr_t *dma_handle, gfp_t gfp);
 668 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 669                                   dma_addr_t dma_handle);
 670 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 671 extern int dmam_declare_coherent_memory(struct device *dev,
 672                                         phys_addr_t phys_addr,
 673                                         dma_addr_t device_addr, size_t size,
 674                                         int flags);
 675 extern void dmam_release_declared_memory(struct device *dev);
 676 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 677 static inline int dmam_declare_coherent_memory(struct device *dev,
 678                                 phys_addr_t phys_addr, dma_addr_t device_addr,
 679                                 size_t size, gfp_t gfp)
 680 {
 681         return 0;
 682 }
 683
 684 static inline void dmam_release_declared_memory(struct device *dev)
 685 {
 686 }
 687 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 688
 689 static inline void *dma_alloc_wc(struct device *dev, size_t size,
 690                                  dma_addr_t *dma_addr, gfp_t gfp)
 691 {
 692         return dma_alloc_attrs(dev, size, dma_addr, gfp,
 693                                DMA_ATTR_WRITE_COMBINE);
 694 }
 695 #ifndef dma_alloc_writecombine
 696 #define dma_alloc_writecombine dma_alloc_wc
 697 #endif
 698
 699 static inline void dma_free_wc(struct device *dev, size_t size,
 700                                void *cpu_addr, dma_addr_t dma_addr)
 701 {
 702         return dma_free_attrs(dev, size, cpu_addr, dma_addr,
 703                               DMA_ATTR_WRITE_COMBINE);
 704 }
 705 #ifndef dma_free_writecombine
 706 #define dma_free_writecombine dma_free_wc
 707 #endif
 708
 709 static inline int dma_mmap_wc(struct device *dev,
 710                               struct vm_area_struct *vma,
 711                               void *cpu_addr, dma_addr_t dma_addr,
 712                               size_t size)
 713 {
 714         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
 715                               DMA_ATTR_WRITE_COMBINE);
 716 }
 717 #ifndef dma_mmap_writecombine
 718 #define dma_mmap_writecombine dma_mmap_wc
 719 #endif
 720
 721 #if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
 722 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 723 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 724 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 725 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 726 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 727 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 728 #else
 729 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 730 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 731 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 732 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 733 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 734 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 735 #endif
 736
 737 #endif