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  * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress
  61  * allocation failure reports (similarly to __GFP_NOWARN).
  62  */
  63 #define DMA_ATTR_NO_WARN        (1UL << 8)
  64
  65 /*
  66  * DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully
  67  * accessible at an elevated privilege level (and ideally inaccessible or
  68  * at least read-only at lesser-privileged levels).
  69  */
  70 #define DMA_ATTR_PRIVILEGED             (1UL << 9)
  71
  72 /*
  73  * A dma_addr_t can hold any valid DMA or bus address for the platform.
  74  * It can be given to a device to use as a DMA source or target.  A CPU cannot
  75  * reference a dma_addr_t directly because there may be translation between
  76  * its physical address space and the bus address space.
  77  */
  78 struct dma_map_ops {
  79         void* (*alloc)(struct device *dev, size_t size,
  80                                 dma_addr_t *dma_handle, gfp_t gfp,
  81                                 unsigned long attrs);
  82         void (*free)(struct device *dev, size_t size,
  83                               void *vaddr, dma_addr_t dma_handle,
  84                               unsigned long attrs);
  85         int (*mmap)(struct device *, struct vm_area_struct *,
  86                           void *, dma_addr_t, size_t,
  87                           unsigned long attrs);
  88
  89         int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
  90                            dma_addr_t, size_t, unsigned long attrs);
  91
  92         dma_addr_t (*map_page)(struct device *dev, struct page *page,
  93                                unsigned long offset, size_t size,
  94                                enum dma_data_direction dir,
  95                                unsigned long attrs);
  96         void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
  97                            size_t size, enum dma_data_direction dir,
  98                            unsigned long attrs);
  99         /*
 100          * map_sg returns 0 on error and a value > 0 on success.
 101          * It should never return a value < 0.
 102          */
 103         int (*map_sg)(struct device *dev, struct scatterlist *sg,
 104                       int nents, enum dma_data_direction dir,
 105                       unsigned long attrs);
 106         void (*unmap_sg)(struct device *dev,
 107                          struct scatterlist *sg, int nents,
 108                          enum dma_data_direction dir,
 109                          unsigned long attrs);
 110         dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
 111                                size_t size, enum dma_data_direction dir,
 112                                unsigned long attrs);
 113         void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
 114                            size_t size, enum dma_data_direction dir,
 115                            unsigned long attrs);
 116         void (*sync_single_for_cpu)(struct device *dev,
 117                                     dma_addr_t dma_handle, size_t size,
 118                                     enum dma_data_direction dir);
 119         void (*sync_single_for_device)(struct device *dev,
 120                                        dma_addr_t dma_handle, size_t size,
 121                                        enum dma_data_direction dir);
 122         void (*sync_sg_for_cpu)(struct device *dev,
 123                                 struct scatterlist *sg, int nents,
 124                                 enum dma_data_direction dir);
 125         void (*sync_sg_for_device)(struct device *dev,
 126                                    struct scatterlist *sg, int nents,
 127                                    enum dma_data_direction dir);
 128         int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
 129         int (*dma_supported)(struct device *dev, u64 mask);
 130         int (*set_dma_mask)(struct device *dev, u64 mask);
 131 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 132         u64 (*get_required_mask)(struct device *dev);
 133 #endif
 134         int is_phys;
 135 };
 136
 137 extern const struct dma_map_ops dma_noop_ops;
 138 extern const struct dma_map_ops dma_virt_ops;
 139
 140 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
 141
 142 #define DMA_MASK_NONE   0x0ULL
 143
 144 static inline int valid_dma_direction(int dma_direction)
 145 {
 146         return ((dma_direction == DMA_BIDIRECTIONAL) ||
 147                 (dma_direction == DMA_TO_DEVICE) ||
 148                 (dma_direction == DMA_FROM_DEVICE));
 149 }
 150
 151 static inline int is_device_dma_capable(struct device *dev)
 152 {
 153         return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
 154 }
 155
 156 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 157 /*
 158  * These three functions are only for dma allocator.
 159  * Don't use them in device drivers.
 160  */
 161 int dma_alloc_from_coherent(struct device *dev, ssize_t size,
 162                                        dma_addr_t *dma_handle, void **ret);
 163 int dma_release_from_coherent(struct device *dev, int order, void *vaddr);
 164
 165 int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
 166                             void *cpu_addr, size_t size, int *ret);
 167 #else
 168 #define dma_alloc_from_coherent(dev, size, handle, ret) (0)
 169 #define dma_release_from_coherent(dev, order, vaddr) (0)
 170 #define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
 171 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 172
 173 #ifdef CONFIG_HAS_DMA
 174 #include <asm/dma-mapping.h>
 175 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 176 {
 177         if (dev && dev->dma_ops)
 178                 return dev->dma_ops;
 179         return get_arch_dma_ops(dev ? dev->bus : NULL);
 180 }
 181
 182 static inline void set_dma_ops(struct device *dev,
 183                                const struct dma_map_ops *dma_ops)
 184 {
 185         dev->dma_ops = dma_ops;
 186 }
 187 #else
 188 /*
 189  * Define the dma api to allow compilation but not linking of
 190  * dma dependent code.  Code that depends on the dma-mapping
 191  * API needs to set 'depends on HAS_DMA' in its Kconfig
 192  */
 193 extern const struct dma_map_ops bad_dma_ops;
 194 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 195 {
 196         return &bad_dma_ops;
 197 }
 198 #endif
 199
 200 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
 201                                               size_t size,
 202                                               enum dma_data_direction dir,
 203                                               unsigned long attrs)
 204 {
 205         const struct dma_map_ops *ops = get_dma_ops(dev);
 206         dma_addr_t addr;
 207
 208         kmemcheck_mark_initialized(ptr, size);
 209         BUG_ON(!valid_dma_direction(dir));
 210         addr = ops->map_page(dev, virt_to_page(ptr),
 211                              offset_in_page(ptr), size,
 212                              dir, attrs);
 213         debug_dma_map_page(dev, virt_to_page(ptr),
 214                            offset_in_page(ptr), size,
 215                            dir, addr, true);
 216         return addr;
 217 }
 218
 219 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
 220                                           size_t size,
 221                                           enum dma_data_direction dir,
 222                                           unsigned long attrs)
 223 {
 224         const struct dma_map_ops *ops = get_dma_ops(dev);
 225
 226         BUG_ON(!valid_dma_direction(dir));
 227         if (ops->unmap_page)
 228                 ops->unmap_page(dev, addr, size, dir, attrs);
 229         debug_dma_unmap_page(dev, addr, size, dir, true);
 230 }
 231
 232 /*
 233  * dma_maps_sg_attrs returns 0 on error and > 0 on success.
 234  * It should never return a value < 0.
 235  */
 236 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 237                                    int nents, enum dma_data_direction dir,
 238                                    unsigned long attrs)
 239 {
 240         const struct dma_map_ops *ops = get_dma_ops(dev);
 241         int i, ents;
 242         struct scatterlist *s;
 243
 244         for_each_sg(sg, s, nents, i)
 245                 kmemcheck_mark_initialized(sg_virt(s), s->length);
 246         BUG_ON(!valid_dma_direction(dir));
 247         ents = ops->map_sg(dev, sg, nents, dir, attrs);
 248         BUG_ON(ents < 0);
 249         debug_dma_map_sg(dev, sg, nents, ents, dir);
 250
 251         return ents;
 252 }
 253
 254 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 255                                       int nents, enum dma_data_direction dir,
 256                                       unsigned long attrs)
 257 {
 258         const struct dma_map_ops *ops = get_dma_ops(dev);
 259
 260         BUG_ON(!valid_dma_direction(dir));
 261         debug_dma_unmap_sg(dev, sg, nents, dir);
 262         if (ops->unmap_sg)
 263                 ops->unmap_sg(dev, sg, nents, dir, attrs);
 264 }
 265
 266 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 267                                             struct page *page,
 268                                             size_t offset, size_t size,
 269                                             enum dma_data_direction dir,
 270                                             unsigned long attrs)
 271 {
 272         const struct dma_map_ops *ops = get_dma_ops(dev);
 273         dma_addr_t addr;
 274
 275         kmemcheck_mark_initialized(page_address(page) + offset, size);
 276         BUG_ON(!valid_dma_direction(dir));
 277         addr = ops->map_page(dev, page, offset, size, dir, attrs);
 278         debug_dma_map_page(dev, page, offset, size, dir, addr, false);
 279
 280         return addr;
 281 }
 282
 283 static inline void dma_unmap_page_attrs(struct device *dev,
 284                                         dma_addr_t addr, size_t size,
 285                                         enum dma_data_direction dir,
 286                                         unsigned long attrs)
 287 {
 288         const struct dma_map_ops *ops = get_dma_ops(dev);
 289
 290         BUG_ON(!valid_dma_direction(dir));
 291         if (ops->unmap_page)
 292                 ops->unmap_page(dev, addr, size, dir, attrs);
 293         debug_dma_unmap_page(dev, addr, size, dir, false);
 294 }
 295
 296 static inline dma_addr_t dma_map_resource(struct device *dev,
 297                                           phys_addr_t phys_addr,
 298                                           size_t size,
 299                                           enum dma_data_direction dir,
 300                                           unsigned long attrs)
 301 {
 302         const struct dma_map_ops *ops = get_dma_ops(dev);
 303         dma_addr_t addr;
 304
 305         BUG_ON(!valid_dma_direction(dir));
 306
 307         /* Don't allow RAM to be mapped */
 308         BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
 309
 310         addr = phys_addr;
 311         if (ops->map_resource)
 312                 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
 313
 314         debug_dma_map_resource(dev, phys_addr, size, dir, addr);
 315
 316         return addr;
 317 }
 318
 319 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
 320                                       size_t size, enum dma_data_direction dir,
 321                                       unsigned long attrs)
 322 {
 323         const struct dma_map_ops *ops = get_dma_ops(dev);
 324
 325         BUG_ON(!valid_dma_direction(dir));
 326         if (ops->unmap_resource)
 327                 ops->unmap_resource(dev, addr, size, dir, attrs);
 328         debug_dma_unmap_resource(dev, addr, size, dir);
 329 }
 330
 331 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 332                                            size_t size,
 333                                            enum dma_data_direction dir)
 334 {
 335         const struct dma_map_ops *ops = get_dma_ops(dev);
 336
 337         BUG_ON(!valid_dma_direction(dir));
 338         if (ops->sync_single_for_cpu)
 339                 ops->sync_single_for_cpu(dev, addr, size, dir);
 340         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 341 }
 342
 343 static inline void dma_sync_single_for_device(struct device *dev,
 344                                               dma_addr_t addr, size_t size,
 345                                               enum dma_data_direction dir)
 346 {
 347         const struct dma_map_ops *ops = get_dma_ops(dev);
 348
 349         BUG_ON(!valid_dma_direction(dir));
 350         if (ops->sync_single_for_device)
 351                 ops->sync_single_for_device(dev, addr, size, dir);
 352         debug_dma_sync_single_for_device(dev, addr, size, dir);
 353 }
 354
 355 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 356                                                  dma_addr_t addr,
 357                                                  unsigned long offset,
 358                                                  size_t size,
 359                                                  enum dma_data_direction dir)
 360 {
 361         const struct dma_map_ops *ops = get_dma_ops(dev);
 362
 363         BUG_ON(!valid_dma_direction(dir));
 364         if (ops->sync_single_for_cpu)
 365                 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
 366         debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
 367 }
 368
 369 static inline void dma_sync_single_range_for_device(struct device *dev,
 370                                                     dma_addr_t addr,
 371                                                     unsigned long offset,
 372                                                     size_t size,
 373                                                     enum dma_data_direction dir)
 374 {
 375         const struct dma_map_ops *ops = get_dma_ops(dev);
 376
 377         BUG_ON(!valid_dma_direction(dir));
 378         if (ops->sync_single_for_device)
 379                 ops->sync_single_for_device(dev, addr + offset, size, dir);
 380         debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
 381 }
 382
 383 static inline void
 384 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 385                     int nelems, enum dma_data_direction dir)
 386 {
 387         const struct dma_map_ops *ops = get_dma_ops(dev);
 388
 389         BUG_ON(!valid_dma_direction(dir));
 390         if (ops->sync_sg_for_cpu)
 391                 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
 392         debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 393 }
 394
 395 static inline void
 396 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 397                        int nelems, enum dma_data_direction dir)
 398 {
 399         const struct dma_map_ops *ops = get_dma_ops(dev);
 400
 401         BUG_ON(!valid_dma_direction(dir));
 402         if (ops->sync_sg_for_device)
 403                 ops->sync_sg_for_device(dev, sg, nelems, dir);
 404         debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 405
 406 }
 407
 408 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
 409 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
 410 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
 411 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
 412 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
 413 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
 414
 415 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 416                            void *cpu_addr, dma_addr_t dma_addr, size_t size);
 417
 418 void *dma_common_contiguous_remap(struct page *page, size_t size,
 419                         unsigned long vm_flags,
 420                         pgprot_t prot, const void *caller);
 421
 422 void *dma_common_pages_remap(struct page **pages, size_t size,
 423                         unsigned long vm_flags, pgprot_t prot,
 424                         const void *caller);
 425 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
 426
 427 /**
 428  * dma_mmap_attrs - map a coherent DMA allocation into user space
 429  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 430  * @vma: vm_area_struct describing requested user mapping
 431  * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 432  * @handle: device-view address returned from dma_alloc_attrs
 433  * @size: size of memory originally requested in dma_alloc_attrs
 434  * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 435  *
 436  * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 437  * into user space.  The coherent DMA buffer must not be freed by the
 438  * driver until the user space mapping has been released.
 439  */
 440 static inline int
 441 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
 442                dma_addr_t dma_addr, size_t size, unsigned long attrs)
 443 {
 444         const struct dma_map_ops *ops = get_dma_ops(dev);
 445         BUG_ON(!ops);
 446         if (ops->mmap)
 447                 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
 448         return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
 449 }
 450
 451 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
 452
 453 int
 454 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 455                        void *cpu_addr, dma_addr_t dma_addr, size_t size);
 456
 457 static inline int
 458 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
 459                       dma_addr_t dma_addr, size_t size,
 460                       unsigned long attrs)
 461 {
 462         const struct dma_map_ops *ops = get_dma_ops(dev);
 463         BUG_ON(!ops);
 464         if (ops->get_sgtable)
 465                 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
 466                                         attrs);
 467         return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
 468 }
 469
 470 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
 471
 472 #ifndef arch_dma_alloc_attrs
 473 #define arch_dma_alloc_attrs(dev, flag) (true)
 474 #endif
 475
 476 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 477                                        dma_addr_t *dma_handle, gfp_t flag,
 478                                        unsigned long attrs)
 479 {
 480         const struct dma_map_ops *ops = get_dma_ops(dev);
 481         void *cpu_addr;
 482
 483         BUG_ON(!ops);
 484
 485         if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr))
 486                 return cpu_addr;
 487
 488         if (!arch_dma_alloc_attrs(&dev, &flag))
 489                 return NULL;
 490         if (!ops->alloc)
 491                 return NULL;
 492
 493         cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
 494         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 495         return cpu_addr;
 496 }
 497
 498 static inline void dma_free_attrs(struct device *dev, size_t size,
 499                                      void *cpu_addr, dma_addr_t dma_handle,
 500                                      unsigned long attrs)
 501 {
 502         const struct dma_map_ops *ops = get_dma_ops(dev);
 503
 504         BUG_ON(!ops);
 505         WARN_ON(irqs_disabled());
 506
 507         if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
 508                 return;
 509
 510         if (!ops->free || !cpu_addr)
 511                 return;
 512
 513         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 514         ops->free(dev, size, cpu_addr, dma_handle, attrs);
 515 }
 516
 517 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 518                 dma_addr_t *dma_handle, gfp_t flag)
 519 {
 520         return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
 521 }
 522
 523 static inline void dma_free_coherent(struct device *dev, size_t size,
 524                 void *cpu_addr, dma_addr_t dma_handle)
 525 {
 526         return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
 527 }
 528
 529 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 530                 dma_addr_t *dma_handle, gfp_t gfp)
 531 {
 532         return dma_alloc_attrs(dev, size, dma_handle, gfp,
 533                                DMA_ATTR_NON_CONSISTENT);
 534 }
 535
 536 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 537                 void *cpu_addr, dma_addr_t dma_handle)
 538 {
 539         dma_free_attrs(dev, size, cpu_addr, dma_handle,
 540                        DMA_ATTR_NON_CONSISTENT);
 541 }
 542
 543 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 544 {
 545         debug_dma_mapping_error(dev, dma_addr);
 546
 547         if (get_dma_ops(dev)->mapping_error)
 548                 return get_dma_ops(dev)->mapping_error(dev, dma_addr);
 549
 550 #ifdef DMA_ERROR_CODE
 551         return dma_addr == DMA_ERROR_CODE;
 552 #else
 553         return 0;
 554 #endif
 555 }
 556
 557 #ifndef HAVE_ARCH_DMA_SUPPORTED
 558 static inline int dma_supported(struct device *dev, u64 mask)
 559 {
 560         const struct dma_map_ops *ops = get_dma_ops(dev);
 561
 562         if (!ops)
 563                 return 0;
 564         if (!ops->dma_supported)
 565                 return 1;
 566         return ops->dma_supported(dev, mask);
 567 }
 568 #endif
 569
 570 #ifndef HAVE_ARCH_DMA_SET_MASK
 571 static inline int dma_set_mask(struct device *dev, u64 mask)
 572 {
 573         const struct dma_map_ops *ops = get_dma_ops(dev);
 574
 575         if (ops->set_dma_mask)
 576                 return ops->set_dma_mask(dev, mask);
 577
 578         if (!dev->dma_mask || !dma_supported(dev, mask))
 579                 return -EIO;
 580         *dev->dma_mask = mask;
 581         return 0;
 582 }
 583 #endif
 584
 585 static inline u64 dma_get_mask(struct device *dev)
 586 {
 587         if (dev && dev->dma_mask && *dev->dma_mask)
 588                 return *dev->dma_mask;
 589         return DMA_BIT_MASK(32);
 590 }
 591
 592 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
 593 int dma_set_coherent_mask(struct device *dev, u64 mask);
 594 #else
 595 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
 596 {
 597         if (!dma_supported(dev, mask))
 598                 return -EIO;
 599         dev->coherent_dma_mask = mask;
 600         return 0;
 601 }
 602 #endif
 603
 604 /*
 605  * Set both the DMA mask and the coherent DMA mask to the same thing.
 606  * Note that we don't check the return value from dma_set_coherent_mask()
 607  * as the DMA API guarantees that the coherent DMA mask can be set to
 608  * the same or smaller than the streaming DMA mask.
 609  */
 610 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 611 {
 612         int rc = dma_set_mask(dev, mask);
 613         if (rc == 0)
 614                 dma_set_coherent_mask(dev, mask);
 615         return rc;
 616 }
 617
 618 /*
 619  * Similar to the above, except it deals with the case where the device
 620  * does not have dev->dma_mask appropriately setup.
 621  */
 622 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 623 {
 624         dev->dma_mask = &dev->coherent_dma_mask;
 625         return dma_set_mask_and_coherent(dev, mask);
 626 }
 627
 628 extern u64 dma_get_required_mask(struct device *dev);
 629
 630 #ifndef arch_setup_dma_ops
 631 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 632                                       u64 size, const struct iommu_ops *iommu,
 633                                       bool coherent) { }
 634 #endif
 635
 636 #ifndef arch_teardown_dma_ops
 637 static inline void arch_teardown_dma_ops(struct device *dev) { }
 638 #endif
 639
 640 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 641 {
 642         if (dev->dma_parms && dev->dma_parms->max_segment_size)
 643                 return dev->dma_parms->max_segment_size;
 644         return SZ_64K;
 645 }
 646
 647 static inline unsigned int dma_set_max_seg_size(struct device *dev,
 648                                                 unsigned int size)
 649 {
 650         if (dev->dma_parms) {
 651                 dev->dma_parms->max_segment_size = size;
 652                 return 0;
 653         }
 654         return -EIO;
 655 }
 656
 657 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 658 {
 659         if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
 660                 return dev->dma_parms->segment_boundary_mask;
 661         return DMA_BIT_MASK(32);
 662 }
 663
 664 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 665 {
 666         if (dev->dma_parms) {
 667                 dev->dma_parms->segment_boundary_mask = mask;
 668                 return 0;
 669         }
 670         return -EIO;
 671 }
 672
 673 #ifndef dma_max_pfn
 674 static inline unsigned long dma_max_pfn(struct device *dev)
 675 {
 676         return *dev->dma_mask >> PAGE_SHIFT;
 677 }
 678 #endif
 679
 680 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 681                                         dma_addr_t *dma_handle, gfp_t flag)
 682 {
 683         void *ret = dma_alloc_coherent(dev, size, dma_handle,
 684                                        flag | __GFP_ZERO);
 685         return ret;
 686 }
 687
 688 #ifdef CONFIG_HAS_DMA
 689 static inline int dma_get_cache_alignment(void)
 690 {
 691 #ifdef ARCH_DMA_MINALIGN
 692         return ARCH_DMA_MINALIGN;
 693 #endif
 694         return 1;
 695 }
 696 #endif
 697
 698 /* flags for the coherent memory api */
 699 #define DMA_MEMORY_MAP                  0x01
 700 #define DMA_MEMORY_IO                   0x02
 701 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
 702 #define DMA_MEMORY_EXCLUSIVE            0x08
 703
 704 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 705 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 706                                 dma_addr_t device_addr, size_t size, int flags);
 707 void dma_release_declared_memory(struct device *dev);
 708 void *dma_mark_declared_memory_occupied(struct device *dev,
 709                                         dma_addr_t device_addr, size_t size);
 710 #else
 711 static inline int
 712 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 713                             dma_addr_t device_addr, size_t size, int flags)
 714 {
 715         return 0;
 716 }
 717
 718 static inline void
 719 dma_release_declared_memory(struct device *dev)
 720 {
 721 }
 722
 723 static inline void *
 724 dma_mark_declared_memory_occupied(struct device *dev,
 725                                   dma_addr_t device_addr, size_t size)
 726 {
 727         return ERR_PTR(-EBUSY);
 728 }
 729 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 730
 731 #ifdef CONFIG_HAS_DMA
 732 int dma_configure(struct device *dev);
 733 void dma_deconfigure(struct device *dev);
 734 #else
 735 static inline int dma_configure(struct device *dev)
 736 {
 737         return 0;
 738 }
 739
 740 static inline void dma_deconfigure(struct device *dev) {}
 741 #endif
 742
 743 /*
 744  * Managed DMA API
 745  */
 746 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 747                                  dma_addr_t *dma_handle, gfp_t gfp);
 748 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 749                                dma_addr_t dma_handle);
 750 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
 751                                     dma_addr_t *dma_handle, gfp_t gfp);
 752 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 753                                   dma_addr_t dma_handle);
 754 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 755 extern int dmam_declare_coherent_memory(struct device *dev,
 756                                         phys_addr_t phys_addr,
 757                                         dma_addr_t device_addr, size_t size,
 758                                         int flags);
 759 extern void dmam_release_declared_memory(struct device *dev);
 760 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 761 static inline int dmam_declare_coherent_memory(struct device *dev,
 762                                 phys_addr_t phys_addr, dma_addr_t device_addr,
 763                                 size_t size, gfp_t gfp)
 764 {
 765         return 0;
 766 }
 767
 768 static inline void dmam_release_declared_memory(struct device *dev)
 769 {
 770 }
 771 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 772
 773 static inline void *dma_alloc_wc(struct device *dev, size_t size,
 774                                  dma_addr_t *dma_addr, gfp_t gfp)
 775 {
 776         return dma_alloc_attrs(dev, size, dma_addr, gfp,
 777                                DMA_ATTR_WRITE_COMBINE);
 778 }
 779 #ifndef dma_alloc_writecombine
 780 #define dma_alloc_writecombine dma_alloc_wc
 781 #endif
 782
 783 static inline void dma_free_wc(struct device *dev, size_t size,
 784                                void *cpu_addr, dma_addr_t dma_addr)
 785 {
 786         return dma_free_attrs(dev, size, cpu_addr, dma_addr,
 787                               DMA_ATTR_WRITE_COMBINE);
 788 }
 789 #ifndef dma_free_writecombine
 790 #define dma_free_writecombine dma_free_wc
 791 #endif
 792
 793 static inline int dma_mmap_wc(struct device *dev,
 794                               struct vm_area_struct *vma,
 795                               void *cpu_addr, dma_addr_t dma_addr,
 796                               size_t size)
 797 {
 798         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
 799                               DMA_ATTR_WRITE_COMBINE);
 800 }
 801 #ifndef dma_mmap_writecombine
 802 #define dma_mmap_writecombine dma_mmap_wc
 803 #endif
 804
 805 #if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
 806 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 807 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 808 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 809 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 810 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 811 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 812 #else
 813 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 814 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 815 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 816 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 817 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 818 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 819 #endif
 820
 821 #endif