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