LXR linux/include/linux/dma-mapping.h

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