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