include/linux/dma-mapping.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_DMA_MAPPING_H
   3 #define _LINUX_DMA_MAPPING_H
   4
   5 #include <linux/sizes.h>
   6 #include <linux/string.h>
   7 #include <linux/device.h>
   8 #include <linux/err.h>
   9 #include <linux/dma-direction.h>
  10 #include <linux/scatterlist.h>
  11 #include <linux/bug.h>
  12 #include <linux/mem_encrypt.h>
  13
  14 /**
  15  * List of possible attributes associated with a DMA mapping. The semantics
  16  * of each attribute should be defined in Documentation/core-api/dma-attributes.rst.
  17  */
  18
  19 /*
  20  * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping
  21  * may be weakly ordered, that is that reads and writes may pass each other.
  22  */
  23 #define DMA_ATTR_WEAK_ORDERING          (1UL << 1)
  24 /*
  25  * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be
  26  * buffered to improve performance.
  27  */
  28 #define DMA_ATTR_WRITE_COMBINE          (1UL << 2)
  29 /*
  30  * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
  31  * virtual mapping for the allocated buffer.
  32  */
  33 #define DMA_ATTR_NO_KERNEL_MAPPING      (1UL << 4)
  34 /*
  35  * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of
  36  * the CPU cache for the given buffer assuming that it has been already
  37  * transferred to 'device' domain.
  38  */
  39 #define DMA_ATTR_SKIP_CPU_SYNC          (1UL << 5)
  40 /*
  41  * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer
  42  * in physical memory.
  43  */
  44 #define DMA_ATTR_FORCE_CONTIGUOUS       (1UL << 6)
  45 /*
  46  * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem
  47  * that it's probably not worth the time to try to allocate memory to in a way
  48  * that gives better TLB efficiency.
  49  */
  50 #define DMA_ATTR_ALLOC_SINGLE_PAGES     (1UL << 7)
  51 /*
  52  * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress
  53  * allocation failure reports (similarly to __GFP_NOWARN).
  54  */
  55 #define DMA_ATTR_NO_WARN        (1UL << 8)
  56
  57 /*
  58  * DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully
  59  * accessible at an elevated privilege level (and ideally inaccessible or
  60  * at least read-only at lesser-privileged levels).
  61  */
  62 #define DMA_ATTR_PRIVILEGED             (1UL << 9)
  63
  64 /*
  65  * A dma_addr_t can hold any valid DMA or bus address for the platform.  It can
  66  * be given to a device to use as a DMA source or target.  It is specific to a
  67  * given device and there may be a translation between the CPU physical address
  68  * space and the bus address space.
  69  *
  70  * DMA_MAPPING_ERROR is the magic error code if a mapping failed.  It should not
  71  * be used directly in drivers, but checked for using dma_mapping_error()
  72  * instead.
  73  */
  74 #define DMA_MAPPING_ERROR               (~(dma_addr_t)0)
  75
  76 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
  77
  78 #ifdef CONFIG_DMA_API_DEBUG
  79 void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
  80 void debug_dma_map_single(struct device *dev, const void *addr,
  81                 unsigned long len);
  82 #else
  83 static inline void debug_dma_mapping_error(struct device *dev,
  84                 dma_addr_t dma_addr)
  85 {
  86 }
  87 static inline void debug_dma_map_single(struct device *dev, const void *addr,
  88                 unsigned long len)
  89 {
  90 }
  91 #endif /* CONFIG_DMA_API_DEBUG */
  92
  93 #ifdef CONFIG_HAS_DMA
  94 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  95 {
  96         debug_dma_mapping_error(dev, dma_addr);
  97
  98         if (unlikely(dma_addr == DMA_MAPPING_ERROR))
  99                 return -ENOMEM;
 100         return 0;
 101 }
 102
 103 dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page,
 104                 size_t offset, size_t size, enum dma_data_direction dir,
 105                 unsigned long attrs);
 106 void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size,
 107                 enum dma_data_direction dir, unsigned long attrs);
 108 int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents,
 109                 enum dma_data_direction dir, unsigned long attrs);
 110 void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 111                                       int nents, enum dma_data_direction dir,
 112                                       unsigned long attrs);
 113 dma_addr_t dma_map_resource(struct device *dev, phys_addr_t phys_addr,
 114                 size_t size, enum dma_data_direction dir, unsigned long attrs);
 115 void dma_unmap_resource(struct device *dev, dma_addr_t addr, size_t size,
 116                 enum dma_data_direction dir, unsigned long attrs);
 117 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size,
 118                 enum dma_data_direction dir);
 119 void dma_sync_single_for_device(struct device *dev, dma_addr_t addr,
 120                 size_t size, enum dma_data_direction dir);
 121 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 122                     int nelems, enum dma_data_direction dir);
 123 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 124                        int nelems, enum dma_data_direction dir);
 125 void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
 126                 gfp_t flag, unsigned long attrs);
 127 void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
 128                 dma_addr_t dma_handle, unsigned long attrs);
 129 void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
 130                 gfp_t gfp, unsigned long attrs);
 131 void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 132                 dma_addr_t dma_handle);
 133 int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt,
 134                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 135                 unsigned long attrs);
 136 int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
 137                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 138                 unsigned long attrs);
 139 bool dma_can_mmap(struct device *dev);
 140 int dma_supported(struct device *dev, u64 mask);
 141 int dma_set_mask(struct device *dev, u64 mask);
 142 int dma_set_coherent_mask(struct device *dev, u64 mask);
 143 u64 dma_get_required_mask(struct device *dev);
 144 size_t dma_max_mapping_size(struct device *dev);
 145 bool dma_need_sync(struct device *dev, dma_addr_t dma_addr);
 146 unsigned long dma_get_merge_boundary(struct device *dev);
 147 struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size,
 148                 enum dma_data_direction dir, gfp_t gfp, unsigned long attrs);
 149 void dma_free_noncontiguous(struct device *dev, size_t size,
 150                 struct sg_table *sgt, enum dma_data_direction dir);
 151 void *dma_vmap_noncontiguous(struct device *dev, size_t size,
 152                 struct sg_table *sgt);
 153 void dma_vunmap_noncontiguous(struct device *dev, void *vaddr);
 154 int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
 155                 size_t size, struct sg_table *sgt);
 156 #else /* CONFIG_HAS_DMA */
 157 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 158                 struct page *page, size_t offset, size_t size,
 159                 enum dma_data_direction dir, unsigned long attrs)
 160 {
 161         return DMA_MAPPING_ERROR;
 162 }
 163 static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr,
 164                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 165 {
 166 }
 167 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 168                 int nents, enum dma_data_direction dir, unsigned long attrs)
 169 {
 170         return 0;
 171 }
 172 static inline void dma_unmap_sg_attrs(struct device *dev,
 173                 struct scatterlist *sg, int nents, enum dma_data_direction dir,
 174                 unsigned long attrs)
 175 {
 176 }
 177 static inline dma_addr_t dma_map_resource(struct device *dev,
 178                 phys_addr_t phys_addr, size_t size, enum dma_data_direction dir,
 179                 unsigned long attrs)
 180 {
 181         return DMA_MAPPING_ERROR;
 182 }
 183 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
 184                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 185 {
 186 }
 187 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 188                 size_t size, enum dma_data_direction dir)
 189 {
 190 }
 191 static inline void dma_sync_single_for_device(struct device *dev,
 192                 dma_addr_t addr, size_t size, enum dma_data_direction dir)
 193 {
 194 }
 195 static inline void dma_sync_sg_for_cpu(struct device *dev,
 196                 struct scatterlist *sg, int nelems, enum dma_data_direction dir)
 197 {
 198 }
 199 static inline void dma_sync_sg_for_device(struct device *dev,
 200                 struct scatterlist *sg, int nelems, enum dma_data_direction dir)
 201 {
 202 }
 203 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 204 {
 205         return -ENOMEM;
 206 }
 207 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 208                 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
 209 {
 210         return NULL;
 211 }
 212 static void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
 213                 dma_addr_t dma_handle, unsigned long attrs)
 214 {
 215 }
 216 static inline void *dmam_alloc_attrs(struct device *dev, size_t size,
 217                 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 218 {
 219         return NULL;
 220 }
 221 static inline void dmam_free_coherent(struct device *dev, size_t size,
 222                 void *vaddr, dma_addr_t dma_handle)
 223 {
 224 }
 225 static inline int dma_get_sgtable_attrs(struct device *dev,
 226                 struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr,
 227                 size_t size, unsigned long attrs)
 228 {
 229         return -ENXIO;
 230 }
 231 static inline int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
 232                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 233                 unsigned long attrs)
 234 {
 235         return -ENXIO;
 236 }
 237 static inline bool dma_can_mmap(struct device *dev)
 238 {
 239         return false;
 240 }
 241 static inline int dma_supported(struct device *dev, u64 mask)
 242 {
 243         return 0;
 244 }
 245 static inline int dma_set_mask(struct device *dev, u64 mask)
 246 {
 247         return -EIO;
 248 }
 249 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
 250 {
 251         return -EIO;
 252 }
 253 static inline u64 dma_get_required_mask(struct device *dev)
 254 {
 255         return 0;
 256 }
 257 static inline size_t dma_max_mapping_size(struct device *dev)
 258 {
 259         return 0;
 260 }
 261 static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr)
 262 {
 263         return false;
 264 }
 265 static inline unsigned long dma_get_merge_boundary(struct device *dev)
 266 {
 267         return 0;
 268 }
 269 static inline struct sg_table *dma_alloc_noncontiguous(struct device *dev,
 270                 size_t size, enum dma_data_direction dir, gfp_t gfp,
 271                 unsigned long attrs)
 272 {
 273         return NULL;
 274 }
 275 static inline void dma_free_noncontiguous(struct device *dev, size_t size,
 276                 struct sg_table *sgt, enum dma_data_direction dir)
 277 {
 278 }
 279 static inline void *dma_vmap_noncontiguous(struct device *dev, size_t size,
 280                 struct sg_table *sgt)
 281 {
 282         return NULL;
 283 }
 284 static inline void dma_vunmap_noncontiguous(struct device *dev, void *vaddr)
 285 {
 286 }
 287 static inline int dma_mmap_noncontiguous(struct device *dev,
 288                 struct vm_area_struct *vma, size_t size, struct sg_table *sgt)
 289 {
 290         return -EINVAL;
 291 }
 292 #endif /* CONFIG_HAS_DMA */
 293
 294 struct page *dma_alloc_pages(struct device *dev, size_t size,
 295                 dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
 296 void dma_free_pages(struct device *dev, size_t size, struct page *page,
 297                 dma_addr_t dma_handle, enum dma_data_direction dir);
 298 int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
 299                 size_t size, struct page *page);
 300
 301 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 302                 dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
 303 {
 304         struct page *page = dma_alloc_pages(dev, size, dma_handle, dir, gfp);
 305         return page ? page_address(page) : NULL;
 306 }
 307
 308 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 309                 void *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir)
 310 {
 311         dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir);
 312 }
 313
 314 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
 315                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 316 {
 317         /* DMA must never operate on areas that might be remapped. */
 318         if (dev_WARN_ONCE(dev, is_vmalloc_addr(ptr),
 319                           "rejecting DMA map of vmalloc memory\n"))
 320                 return DMA_MAPPING_ERROR;
 321         debug_dma_map_single(dev, ptr, size);
 322         return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr),
 323                         size, dir, attrs);
 324 }
 325
 326 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
 327                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 328 {
 329         return dma_unmap_page_attrs(dev, addr, size, dir, attrs);
 330 }
 331
 332 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 333                 dma_addr_t addr, unsigned long offset, size_t size,
 334                 enum dma_data_direction dir)
 335 {
 336         return dma_sync_single_for_cpu(dev, addr + offset, size, dir);
 337 }
 338
 339 static inline void dma_sync_single_range_for_device(struct device *dev,
 340                 dma_addr_t addr, unsigned long offset, size_t size,
 341                 enum dma_data_direction dir)
 342 {
 343         return dma_sync_single_for_device(dev, addr + offset, size, dir);
 344 }
 345
 346 /**
 347  * dma_map_sgtable - Map the given buffer for DMA
 348  * @dev:        The device for which to perform the DMA operation
 349  * @sgt:        The sg_table object describing the buffer
 350  * @dir:        DMA direction
 351  * @attrs:      Optional DMA attributes for the map operation
 352  *
 353  * Maps a buffer described by a scatterlist stored in the given sg_table
 354  * object for the @dir DMA operation by the @dev device. After success the
 355  * ownership for the buffer is transferred to the DMA domain.  One has to
 356  * call dma_sync_sgtable_for_cpu() or dma_unmap_sgtable() to move the
 357  * ownership of the buffer back to the CPU domain before touching the
 358  * buffer by the CPU.
 359  *
 360  * Returns 0 on success or -EINVAL on error during mapping the buffer.
 361  */
 362 static inline int dma_map_sgtable(struct device *dev, struct sg_table *sgt,
 363                 enum dma_data_direction dir, unsigned long attrs)
 364 {
 365         int nents;
 366
 367         nents = dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs);
 368         if (nents <= 0)
 369                 return -EINVAL;
 370         sgt->nents = nents;
 371         return 0;
 372 }
 373
 374 /**
 375  * dma_unmap_sgtable - Unmap the given buffer for DMA
 376  * @dev:        The device for which to perform the DMA operation
 377  * @sgt:        The sg_table object describing the buffer
 378  * @dir:        DMA direction
 379  * @attrs:      Optional DMA attributes for the unmap operation
 380  *
 381  * Unmaps a buffer described by a scatterlist stored in the given sg_table
 382  * object for the @dir DMA operation by the @dev device. After this function
 383  * the ownership of the buffer is transferred back to the CPU domain.
 384  */
 385 static inline void dma_unmap_sgtable(struct device *dev, struct sg_table *sgt,
 386                 enum dma_data_direction dir, unsigned long attrs)
 387 {
 388         dma_unmap_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs);
 389 }
 390
 391 /**
 392  * dma_sync_sgtable_for_cpu - Synchronize the given buffer for CPU access
 393  * @dev:        The device for which to perform the DMA operation
 394  * @sgt:        The sg_table object describing the buffer
 395  * @dir:        DMA direction
 396  *
 397  * Performs the needed cache synchronization and moves the ownership of the
 398  * buffer back to the CPU domain, so it is safe to perform any access to it
 399  * by the CPU. Before doing any further DMA operations, one has to transfer
 400  * the ownership of the buffer back to the DMA domain by calling the
 401  * dma_sync_sgtable_for_device().
 402  */
 403 static inline void dma_sync_sgtable_for_cpu(struct device *dev,
 404                 struct sg_table *sgt, enum dma_data_direction dir)
 405 {
 406         dma_sync_sg_for_cpu(dev, sgt->sgl, sgt->orig_nents, dir);
 407 }
 408
 409 /**
 410  * dma_sync_sgtable_for_device - Synchronize the given buffer for DMA
 411  * @dev:        The device for which to perform the DMA operation
 412  * @sgt:        The sg_table object describing the buffer
 413  * @dir:        DMA direction
 414  *
 415  * Performs the needed cache synchronization and moves the ownership of the
 416  * buffer back to the DMA domain, so it is safe to perform the DMA operation.
 417  * Once finished, one has to call dma_sync_sgtable_for_cpu() or
 418  * dma_unmap_sgtable().
 419  */
 420 static inline void dma_sync_sgtable_for_device(struct device *dev,
 421                 struct sg_table *sgt, enum dma_data_direction dir)
 422 {
 423         dma_sync_sg_for_device(dev, sgt->sgl, sgt->orig_nents, dir);
 424 }
 425
 426 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
 427 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
 428 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
 429 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
 430 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
 431 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
 432 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
 433 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
 434
 435 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 436                 dma_addr_t *dma_handle, gfp_t gfp)
 437 {
 438         return dma_alloc_attrs(dev, size, dma_handle, gfp,
 439                         (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0);
 440 }
 441
 442 static inline void dma_free_coherent(struct device *dev, size_t size,
 443                 void *cpu_addr, dma_addr_t dma_handle)
 444 {
 445         return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
 446 }
 447
 448
 449 static inline u64 dma_get_mask(struct device *dev)
 450 {
 451         if (dev->dma_mask && *dev->dma_mask)
 452                 return *dev->dma_mask;
 453         return DMA_BIT_MASK(32);
 454 }
 455
 456 /*
 457  * Set both the DMA mask and the coherent DMA mask to the same thing.
 458  * Note that we don't check the return value from dma_set_coherent_mask()
 459  * as the DMA API guarantees that the coherent DMA mask can be set to
 460  * the same or smaller than the streaming DMA mask.
 461  */
 462 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 463 {
 464         int rc = dma_set_mask(dev, mask);
 465         if (rc == 0)
 466                 dma_set_coherent_mask(dev, mask);
 467         return rc;
 468 }
 469
 470 /*
 471  * Similar to the above, except it deals with the case where the device
 472  * does not have dev->dma_mask appropriately setup.
 473  */
 474 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 475 {
 476         dev->dma_mask = &dev->coherent_dma_mask;
 477         return dma_set_mask_and_coherent(dev, mask);
 478 }
 479
 480 /**
 481  * dma_addressing_limited - return if the device is addressing limited
 482  * @dev:        device to check
 483  *
 484  * Return %true if the devices DMA mask is too small to address all memory in
 485  * the system, else %false.  Lack of addressing bits is the prime reason for
 486  * bounce buffering, but might not be the only one.
 487  */
 488 static inline bool dma_addressing_limited(struct device *dev)
 489 {
 490         return min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) <
 491                             dma_get_required_mask(dev);
 492 }
 493
 494 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 495 {
 496         if (dev->dma_parms && dev->dma_parms->max_segment_size)
 497                 return dev->dma_parms->max_segment_size;
 498         return SZ_64K;
 499 }
 500
 501 static inline int dma_set_max_seg_size(struct device *dev, unsigned int size)
 502 {
 503         if (dev->dma_parms) {
 504                 dev->dma_parms->max_segment_size = size;
 505                 return 0;
 506         }
 507         return -EIO;
 508 }
 509
 510 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 511 {
 512         if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
 513                 return dev->dma_parms->segment_boundary_mask;
 514         return ULONG_MAX;
 515 }
 516
 517 /**
 518  * dma_get_seg_boundary_nr_pages - return the segment boundary in "page" units
 519  * @dev: device to guery the boundary for
 520  * @page_shift: ilog() of the IOMMU page size
 521  *
 522  * Return the segment boundary in IOMMU page units (which may be different from
 523  * the CPU page size) for the passed in device.
 524  *
 525  * If @dev is NULL a boundary of U32_MAX is assumed, this case is just for
 526  * non-DMA API callers.
 527  */
 528 static inline unsigned long dma_get_seg_boundary_nr_pages(struct device *dev,
 529                 unsigned int page_shift)
 530 {
 531         if (!dev)
 532                 return (U32_MAX >> page_shift) + 1;
 533         return (dma_get_seg_boundary(dev) >> page_shift) + 1;
 534 }
 535
 536 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 537 {
 538         if (dev->dma_parms) {
 539                 dev->dma_parms->segment_boundary_mask = mask;
 540                 return 0;
 541         }
 542         return -EIO;
 543 }
 544
 545 static inline unsigned int dma_get_min_align_mask(struct device *dev)
 546 {
 547         if (dev->dma_parms)
 548                 return dev->dma_parms->min_align_mask;
 549         return 0;
 550 }
 551
 552 static inline int dma_set_min_align_mask(struct device *dev,
 553                 unsigned int min_align_mask)
 554 {
 555         if (WARN_ON_ONCE(!dev->dma_parms))
 556                 return -EIO;
 557         dev->dma_parms->min_align_mask = min_align_mask;
 558         return 0;
 559 }
 560
 561 static inline int dma_get_cache_alignment(void)
 562 {
 563 #ifdef ARCH_DMA_MINALIGN
 564         return ARCH_DMA_MINALIGN;
 565 #endif
 566         return 1;
 567 }
 568
 569 static inline void *dmam_alloc_coherent(struct device *dev, size_t size,
 570                 dma_addr_t *dma_handle, gfp_t gfp)
 571 {
 572         return dmam_alloc_attrs(dev, size, dma_handle, gfp,
 573                         (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0);
 574 }
 575
 576 static inline void *dma_alloc_wc(struct device *dev, size_t size,
 577                                  dma_addr_t *dma_addr, gfp_t gfp)
 578 {
 579         unsigned long attrs = DMA_ATTR_WRITE_COMBINE;
 580
 581         if (gfp & __GFP_NOWARN)
 582                 attrs |= DMA_ATTR_NO_WARN;
 583
 584         return dma_alloc_attrs(dev, size, dma_addr, gfp, attrs);
 585 }
 586
 587 static inline void dma_free_wc(struct device *dev, size_t size,
 588                                void *cpu_addr, dma_addr_t dma_addr)
 589 {
 590         return dma_free_attrs(dev, size, cpu_addr, dma_addr,
 591                               DMA_ATTR_WRITE_COMBINE);
 592 }
 593
 594 static inline int dma_mmap_wc(struct device *dev,
 595                               struct vm_area_struct *vma,
 596                               void *cpu_addr, dma_addr_t dma_addr,
 597                               size_t size)
 598 {
 599         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
 600                               DMA_ATTR_WRITE_COMBINE);
 601 }
 602
 603 #ifdef CONFIG_NEED_DMA_MAP_STATE
 604 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 605 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 606 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 607 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 608 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 609 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 610 #else
 611 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 612 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 613 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 614 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 615 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 616 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 617 #endif
 618
 619 #endif /* _LINUX_DMA_MAPPING_H */