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-debug.h>
  10 #include <linux/dma-direction.h>
  11 #include <linux/scatterlist.h>
  12 #include <linux/bug.h>
  13 #include <linux/mem_encrypt.h>
  14
  15 /**
  16  * List of possible attributes associated with a DMA mapping. The semantics
  17  * of each attribute should be defined in Documentation/DMA-attributes.txt.
  18  *
  19  * DMA_ATTR_WRITE_BARRIER: DMA to a memory region with this attribute
  20  * forces all pending DMA writes to complete.
  21  */
  22 #define DMA_ATTR_WRITE_BARRIER          (1UL << 0)
  23 /*
  24  * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping
  25  * may be weakly ordered, that is that reads and writes may pass each other.
  26  */
  27 #define DMA_ATTR_WEAK_ORDERING          (1UL << 1)
  28 /*
  29  * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be
  30  * buffered to improve performance.
  31  */
  32 #define DMA_ATTR_WRITE_COMBINE          (1UL << 2)
  33 /*
  34  * DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either
  35  * consistent or non-consistent memory as it sees fit.
  36  */
  37 #define DMA_ATTR_NON_CONSISTENT         (1UL << 3)
  38 /*
  39  * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
  40  * virtual mapping for the allocated buffer.
  41  */
  42 #define DMA_ATTR_NO_KERNEL_MAPPING      (1UL << 4)
  43 /*
  44  * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of
  45  * the CPU cache for the given buffer assuming that it has been already
  46  * transferred to 'device' domain.
  47  */
  48 #define DMA_ATTR_SKIP_CPU_SYNC          (1UL << 5)
  49 /*
  50  * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer
  51  * in physical memory.
  52  */
  53 #define DMA_ATTR_FORCE_CONTIGUOUS       (1UL << 6)
  54 /*
  55  * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem
  56  * that it's probably not worth the time to try to allocate memory to in a way
  57  * that gives better TLB efficiency.
  58  */
  59 #define DMA_ATTR_ALLOC_SINGLE_PAGES     (1UL << 7)
  60 /*
  61  * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress
  62  * allocation failure reports (similarly to __GFP_NOWARN).
  63  */
  64 #define DMA_ATTR_NO_WARN        (1UL << 8)
  65
  66 /*
  67  * DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully
  68  * accessible at an elevated privilege level (and ideally inaccessible or
  69  * at least read-only at lesser-privileged levels).
  70  */
  71 #define DMA_ATTR_PRIVILEGED             (1UL << 9)
  72
  73 /*
  74  * A dma_addr_t can hold any valid DMA or bus address for the platform.
  75  * It can be given to a device to use as a DMA source or target.  A CPU cannot
  76  * reference a dma_addr_t directly because there may be translation between
  77  * its physical address space and the bus address space.
  78  */
  79 struct dma_map_ops {
  80         void* (*alloc)(struct device *dev, size_t size,
  81                                 dma_addr_t *dma_handle, gfp_t gfp,
  82                                 unsigned long attrs);
  83         void (*free)(struct device *dev, size_t size,
  84                               void *vaddr, dma_addr_t dma_handle,
  85                               unsigned long attrs);
  86         int (*mmap)(struct device *, struct vm_area_struct *,
  87                           void *, dma_addr_t, size_t,
  88                           unsigned long attrs);
  89
  90         int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
  91                            dma_addr_t, size_t, unsigned long attrs);
  92
  93         dma_addr_t (*map_page)(struct device *dev, struct page *page,
  94                                unsigned long offset, size_t size,
  95                                enum dma_data_direction dir,
  96                                unsigned long attrs);
  97         void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
  98                            size_t size, enum dma_data_direction dir,
  99                            unsigned long attrs);
 100         /*
 101          * map_sg returns 0 on error and a value > 0 on success.
 102          * It should never return a value < 0.
 103          */
 104         int (*map_sg)(struct device *dev, struct scatterlist *sg,
 105                       int nents, enum dma_data_direction dir,
 106                       unsigned long attrs);
 107         void (*unmap_sg)(struct device *dev,
 108                          struct scatterlist *sg, int nents,
 109                          enum dma_data_direction dir,
 110                          unsigned long attrs);
 111         dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
 112                                size_t size, enum dma_data_direction dir,
 113                                unsigned long attrs);
 114         void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
 115                            size_t size, enum dma_data_direction dir,
 116                            unsigned long attrs);
 117         void (*sync_single_for_cpu)(struct device *dev,
 118                                     dma_addr_t dma_handle, size_t size,
 119                                     enum dma_data_direction dir);
 120         void (*sync_single_for_device)(struct device *dev,
 121                                        dma_addr_t dma_handle, size_t size,
 122                                        enum dma_data_direction dir);
 123         void (*sync_sg_for_cpu)(struct device *dev,
 124                                 struct scatterlist *sg, int nents,
 125                                 enum dma_data_direction dir);
 126         void (*sync_sg_for_device)(struct device *dev,
 127                                    struct scatterlist *sg, int nents,
 128                                    enum dma_data_direction dir);
 129         void (*cache_sync)(struct device *dev, void *vaddr, size_t size,
 130                         enum dma_data_direction direction);
 131         int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
 132         int (*dma_supported)(struct device *dev, u64 mask);
 133         u64 (*get_required_mask)(struct device *dev);
 134 };
 135
 136 extern const struct dma_map_ops dma_direct_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_dev_coherent(struct device *dev, ssize_t size,
 161                                        dma_addr_t *dma_handle, void **ret);
 162 int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
 163
 164 int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
 165                             void *cpu_addr, size_t size, int *ret);
 166
 167 void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle);
 168 int dma_release_from_global_coherent(int order, void *vaddr);
 169 int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
 170                                   size_t size, int *ret);
 171
 172 #else
 173 #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
 174 #define dma_release_from_dev_coherent(dev, order, vaddr) (0)
 175 #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
 176
 177 static inline void *dma_alloc_from_global_coherent(ssize_t size,
 178                                                    dma_addr_t *dma_handle)
 179 {
 180         return NULL;
 181 }
 182
 183 static inline int dma_release_from_global_coherent(int order, void *vaddr)
 184 {
 185         return 0;
 186 }
 187
 188 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
 189                                                 void *cpu_addr, size_t size,
 190                                                 int *ret)
 191 {
 192         return 0;
 193 }
 194 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 195
 196 #ifdef CONFIG_HAS_DMA
 197 #include <asm/dma-mapping.h>
 198 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 199 {
 200         if (dev && dev->dma_ops)
 201                 return dev->dma_ops;
 202         return get_arch_dma_ops(dev ? dev->bus : NULL);
 203 }
 204
 205 static inline void set_dma_ops(struct device *dev,
 206                                const struct dma_map_ops *dma_ops)
 207 {
 208         dev->dma_ops = dma_ops;
 209 }
 210 #else
 211 /*
 212  * Define the dma api to allow compilation of dma dependent code.
 213  * Code that depends on the dma-mapping API needs to set 'depends on HAS_DMA'
 214  * in its Kconfig, unless it already depends on <something> || COMPILE_TEST,
 215  * where <something> guarantuees the availability of the dma-mapping API.
 216  */
 217 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 218 {
 219         return NULL;
 220 }
 221 #endif
 222
 223 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
 224                                               size_t size,
 225                                               enum dma_data_direction dir,
 226                                               unsigned long attrs)
 227 {
 228         const struct dma_map_ops *ops = get_dma_ops(dev);
 229         dma_addr_t addr;
 230
 231         BUG_ON(!valid_dma_direction(dir));
 232         debug_dma_map_single(dev, ptr, size);
 233         addr = ops->map_page(dev, virt_to_page(ptr),
 234                              offset_in_page(ptr), size,
 235                              dir, attrs);
 236         debug_dma_map_page(dev, virt_to_page(ptr),
 237                            offset_in_page(ptr), size,
 238                            dir, addr, true);
 239         return addr;
 240 }
 241
 242 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
 243                                           size_t size,
 244                                           enum dma_data_direction dir,
 245                                           unsigned long attrs)
 246 {
 247         const struct dma_map_ops *ops = get_dma_ops(dev);
 248
 249         BUG_ON(!valid_dma_direction(dir));
 250         if (ops->unmap_page)
 251                 ops->unmap_page(dev, addr, size, dir, attrs);
 252         debug_dma_unmap_page(dev, addr, size, dir, true);
 253 }
 254
 255 /*
 256  * dma_maps_sg_attrs returns 0 on error and > 0 on success.
 257  * It should never return a value < 0.
 258  */
 259 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 260                                    int nents, enum dma_data_direction dir,
 261                                    unsigned long attrs)
 262 {
 263         const struct dma_map_ops *ops = get_dma_ops(dev);
 264         int ents;
 265
 266         BUG_ON(!valid_dma_direction(dir));
 267         ents = ops->map_sg(dev, sg, nents, dir, attrs);
 268         BUG_ON(ents < 0);
 269         debug_dma_map_sg(dev, sg, nents, ents, dir);
 270
 271         return ents;
 272 }
 273
 274 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 275                                       int nents, enum dma_data_direction dir,
 276                                       unsigned long attrs)
 277 {
 278         const struct dma_map_ops *ops = get_dma_ops(dev);
 279
 280         BUG_ON(!valid_dma_direction(dir));
 281         debug_dma_unmap_sg(dev, sg, nents, dir);
 282         if (ops->unmap_sg)
 283                 ops->unmap_sg(dev, sg, nents, dir, attrs);
 284 }
 285
 286 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 287                                             struct page *page,
 288                                             size_t offset, size_t size,
 289                                             enum dma_data_direction dir,
 290                                             unsigned long attrs)
 291 {
 292         const struct dma_map_ops *ops = get_dma_ops(dev);
 293         dma_addr_t addr;
 294
 295         BUG_ON(!valid_dma_direction(dir));
 296         addr = ops->map_page(dev, page, offset, size, dir, attrs);
 297         debug_dma_map_page(dev, page, offset, size, dir, addr, false);
 298
 299         return addr;
 300 }
 301
 302 static inline void dma_unmap_page_attrs(struct device *dev,
 303                                         dma_addr_t addr, size_t size,
 304                                         enum dma_data_direction dir,
 305                                         unsigned long attrs)
 306 {
 307         const struct dma_map_ops *ops = get_dma_ops(dev);
 308
 309         BUG_ON(!valid_dma_direction(dir));
 310         if (ops->unmap_page)
 311                 ops->unmap_page(dev, addr, size, dir, attrs);
 312         debug_dma_unmap_page(dev, addr, size, dir, false);
 313 }
 314
 315 static inline dma_addr_t dma_map_resource(struct device *dev,
 316                                           phys_addr_t phys_addr,
 317                                           size_t size,
 318                                           enum dma_data_direction dir,
 319                                           unsigned long attrs)
 320 {
 321         const struct dma_map_ops *ops = get_dma_ops(dev);
 322         dma_addr_t addr;
 323
 324         BUG_ON(!valid_dma_direction(dir));
 325
 326         /* Don't allow RAM to be mapped */
 327         BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
 328
 329         addr = phys_addr;
 330         if (ops->map_resource)
 331                 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
 332
 333         debug_dma_map_resource(dev, phys_addr, size, dir, addr);
 334
 335         return addr;
 336 }
 337
 338 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
 339                                       size_t size, enum dma_data_direction dir,
 340                                       unsigned long attrs)
 341 {
 342         const struct dma_map_ops *ops = get_dma_ops(dev);
 343
 344         BUG_ON(!valid_dma_direction(dir));
 345         if (ops->unmap_resource)
 346                 ops->unmap_resource(dev, addr, size, dir, attrs);
 347         debug_dma_unmap_resource(dev, addr, size, dir);
 348 }
 349
 350 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 351                                            size_t size,
 352                                            enum dma_data_direction dir)
 353 {
 354         const struct dma_map_ops *ops = get_dma_ops(dev);
 355
 356         BUG_ON(!valid_dma_direction(dir));
 357         if (ops->sync_single_for_cpu)
 358                 ops->sync_single_for_cpu(dev, addr, size, dir);
 359         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 360 }
 361
 362 static inline void dma_sync_single_for_device(struct device *dev,
 363                                               dma_addr_t addr, size_t size,
 364                                               enum dma_data_direction dir)
 365 {
 366         const struct dma_map_ops *ops = get_dma_ops(dev);
 367
 368         BUG_ON(!valid_dma_direction(dir));
 369         if (ops->sync_single_for_device)
 370                 ops->sync_single_for_device(dev, addr, size, dir);
 371         debug_dma_sync_single_for_device(dev, addr, size, dir);
 372 }
 373
 374 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 375                                                  dma_addr_t addr,
 376                                                  unsigned long offset,
 377                                                  size_t size,
 378                                                  enum dma_data_direction dir)
 379 {
 380         const struct dma_map_ops *ops = get_dma_ops(dev);
 381
 382         BUG_ON(!valid_dma_direction(dir));
 383         if (ops->sync_single_for_cpu)
 384                 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
 385         debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
 386 }
 387
 388 static inline void dma_sync_single_range_for_device(struct device *dev,
 389                                                     dma_addr_t addr,
 390                                                     unsigned long offset,
 391                                                     size_t size,
 392                                                     enum dma_data_direction dir)
 393 {
 394         const struct dma_map_ops *ops = get_dma_ops(dev);
 395
 396         BUG_ON(!valid_dma_direction(dir));
 397         if (ops->sync_single_for_device)
 398                 ops->sync_single_for_device(dev, addr + offset, size, dir);
 399         debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
 400 }
 401
 402 static inline void
 403 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 404                     int nelems, enum dma_data_direction dir)
 405 {
 406         const struct dma_map_ops *ops = get_dma_ops(dev);
 407
 408         BUG_ON(!valid_dma_direction(dir));
 409         if (ops->sync_sg_for_cpu)
 410                 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
 411         debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 412 }
 413
 414 static inline void
 415 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 416                        int nelems, enum dma_data_direction dir)
 417 {
 418         const struct dma_map_ops *ops = get_dma_ops(dev);
 419
 420         BUG_ON(!valid_dma_direction(dir));
 421         if (ops->sync_sg_for_device)
 422                 ops->sync_sg_for_device(dev, sg, nelems, dir);
 423         debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 424
 425 }
 426
 427 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
 428 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
 429 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
 430 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
 431 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
 432 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
 433
 434 static inline void
 435 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 436                 enum dma_data_direction dir)
 437 {
 438         const struct dma_map_ops *ops = get_dma_ops(dev);
 439
 440         BUG_ON(!valid_dma_direction(dir));
 441         if (ops->cache_sync)
 442                 ops->cache_sync(dev, vaddr, size, dir);
 443 }
 444
 445 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 446                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 447                 unsigned long attrs);
 448
 449 void *dma_common_contiguous_remap(struct page *page, size_t size,
 450                         unsigned long vm_flags,
 451                         pgprot_t prot, const void *caller);
 452
 453 void *dma_common_pages_remap(struct page **pages, size_t size,
 454                         unsigned long vm_flags, pgprot_t prot,
 455                         const void *caller);
 456 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
 457
 458 /**
 459  * dma_mmap_attrs - map a coherent DMA allocation into user space
 460  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 461  * @vma: vm_area_struct describing requested user mapping
 462  * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 463  * @handle: device-view address returned from dma_alloc_attrs
 464  * @size: size of memory originally requested in dma_alloc_attrs
 465  * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 466  *
 467  * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 468  * into user space.  The coherent DMA buffer must not be freed by the
 469  * driver until the user space mapping has been released.
 470  */
 471 static inline int
 472 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
 473                dma_addr_t dma_addr, size_t size, unsigned long attrs)
 474 {
 475         const struct dma_map_ops *ops = get_dma_ops(dev);
 476         BUG_ON(!ops);
 477         if (ops->mmap)
 478                 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
 479         return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
 480 }
 481
 482 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
 483
 484 int
 485 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr,
 486                 dma_addr_t dma_addr, size_t size, unsigned long attrs);
 487
 488 static inline int
 489 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
 490                       dma_addr_t dma_addr, size_t size,
 491                       unsigned long attrs)
 492 {
 493         const struct dma_map_ops *ops = get_dma_ops(dev);
 494         BUG_ON(!ops);
 495         if (ops->get_sgtable)
 496                 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
 497                                         attrs);
 498         return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
 499                         attrs);
 500 }
 501
 502 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
 503
 504 #ifndef arch_dma_alloc_attrs
 505 #define arch_dma_alloc_attrs(dev)       (true)
 506 #endif
 507
 508 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 509                                        dma_addr_t *dma_handle, gfp_t flag,
 510                                        unsigned long attrs)
 511 {
 512         const struct dma_map_ops *ops = get_dma_ops(dev);
 513         void *cpu_addr;
 514
 515         BUG_ON(!ops);
 516         WARN_ON_ONCE(dev && !dev->coherent_dma_mask);
 517
 518         if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
 519                 return cpu_addr;
 520
 521         /* let the implementation decide on the zone to allocate from: */
 522         flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
 523
 524         if (!arch_dma_alloc_attrs(&dev))
 525                 return NULL;
 526         if (!ops->alloc)
 527                 return NULL;
 528
 529         cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
 530         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 531         return cpu_addr;
 532 }
 533
 534 static inline void dma_free_attrs(struct device *dev, size_t size,
 535                                      void *cpu_addr, dma_addr_t dma_handle,
 536                                      unsigned long attrs)
 537 {
 538         const struct dma_map_ops *ops = get_dma_ops(dev);
 539
 540         BUG_ON(!ops);
 541
 542         if (dma_release_from_dev_coherent(dev, get_order(size), cpu_addr))
 543                 return;
 544         /*
 545          * On non-coherent platforms which implement DMA-coherent buffers via
 546          * non-cacheable remaps, ops->free() may call vunmap(). Thus getting
 547          * this far in IRQ context is a) at risk of a BUG_ON() or trying to
 548          * sleep on some machines, and b) an indication that the driver is
 549          * probably misusing the coherent API anyway.
 550          */
 551         WARN_ON(irqs_disabled());
 552
 553         if (!ops->free || !cpu_addr)
 554                 return;
 555
 556         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 557         ops->free(dev, size, cpu_addr, dma_handle, attrs);
 558 }
 559
 560 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 561                 dma_addr_t *dma_handle, gfp_t gfp)
 562 {
 563
 564         return dma_alloc_attrs(dev, size, dma_handle, gfp,
 565                         (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0);
 566 }
 567
 568 static inline void dma_free_coherent(struct device *dev, size_t size,
 569                 void *cpu_addr, dma_addr_t dma_handle)
 570 {
 571         return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
 572 }
 573
 574 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 575 {
 576         const struct dma_map_ops *ops = get_dma_ops(dev);
 577
 578         debug_dma_mapping_error(dev, dma_addr);
 579         if (ops->mapping_error)
 580                 return ops->mapping_error(dev, dma_addr);
 581         return 0;
 582 }
 583
 584 static inline void dma_check_mask(struct device *dev, u64 mask)
 585 {
 586         if (sme_active() && (mask < (((u64)sme_get_me_mask() << 1) - 1)))
 587                 dev_warn(dev, "SME is active, device will require DMA bounce buffers\n");
 588 }
 589
 590 static inline int dma_supported(struct device *dev, u64 mask)
 591 {
 592         const struct dma_map_ops *ops = get_dma_ops(dev);
 593
 594         if (!ops)
 595                 return 0;
 596         if (!ops->dma_supported)
 597                 return 1;
 598         return ops->dma_supported(dev, mask);
 599 }
 600
 601 #ifndef HAVE_ARCH_DMA_SET_MASK
 602 static inline int dma_set_mask(struct device *dev, u64 mask)
 603 {
 604         if (!dev->dma_mask || !dma_supported(dev, mask))
 605                 return -EIO;
 606
 607         dma_check_mask(dev, mask);
 608
 609         *dev->dma_mask = mask;
 610         return 0;
 611 }
 612 #endif
 613
 614 static inline u64 dma_get_mask(struct device *dev)
 615 {
 616         if (dev && dev->dma_mask && *dev->dma_mask)
 617                 return *dev->dma_mask;
 618         return DMA_BIT_MASK(32);
 619 }
 620
 621 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
 622 int dma_set_coherent_mask(struct device *dev, u64 mask);
 623 #else
 624 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
 625 {
 626         if (!dma_supported(dev, mask))
 627                 return -EIO;
 628
 629         dma_check_mask(dev, mask);
 630
 631         dev->coherent_dma_mask = mask;
 632         return 0;
 633 }
 634 #endif
 635
 636 /*
 637  * Set both the DMA mask and the coherent DMA mask to the same thing.
 638  * Note that we don't check the return value from dma_set_coherent_mask()
 639  * as the DMA API guarantees that the coherent DMA mask can be set to
 640  * the same or smaller than the streaming DMA mask.
 641  */
 642 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 643 {
 644         int rc = dma_set_mask(dev, mask);
 645         if (rc == 0)
 646                 dma_set_coherent_mask(dev, mask);
 647         return rc;
 648 }
 649
 650 /*
 651  * Similar to the above, except it deals with the case where the device
 652  * does not have dev->dma_mask appropriately setup.
 653  */
 654 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 655 {
 656         dev->dma_mask = &dev->coherent_dma_mask;
 657         return dma_set_mask_and_coherent(dev, mask);
 658 }
 659
 660 extern u64 dma_get_required_mask(struct device *dev);
 661
 662 #ifndef arch_setup_dma_ops
 663 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 664                                       u64 size, const struct iommu_ops *iommu,
 665                                       bool coherent) { }
 666 #endif
 667
 668 #ifndef arch_teardown_dma_ops
 669 static inline void arch_teardown_dma_ops(struct device *dev) { }
 670 #endif
 671
 672 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 673 {
 674         if (dev->dma_parms && dev->dma_parms->max_segment_size)
 675                 return dev->dma_parms->max_segment_size;
 676         return SZ_64K;
 677 }
 678
 679 static inline unsigned int dma_set_max_seg_size(struct device *dev,
 680                                                 unsigned int size)
 681 {
 682         if (dev->dma_parms) {
 683                 dev->dma_parms->max_segment_size = size;
 684                 return 0;
 685         }
 686         return -EIO;
 687 }
 688
 689 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 690 {
 691         if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
 692                 return dev->dma_parms->segment_boundary_mask;
 693         return DMA_BIT_MASK(32);
 694 }
 695
 696 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 697 {
 698         if (dev->dma_parms) {
 699                 dev->dma_parms->segment_boundary_mask = mask;
 700                 return 0;
 701         }
 702         return -EIO;
 703 }
 704
 705 #ifndef dma_max_pfn
 706 static inline unsigned long dma_max_pfn(struct device *dev)
 707 {
 708         return (*dev->dma_mask >> PAGE_SHIFT) + dev->dma_pfn_offset;
 709 }
 710 #endif
 711
 712 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 713                                         dma_addr_t *dma_handle, gfp_t flag)
 714 {
 715         void *ret = dma_alloc_coherent(dev, size, dma_handle,
 716                                        flag | __GFP_ZERO);
 717         return ret;
 718 }
 719
 720 static inline int dma_get_cache_alignment(void)
 721 {
 722 #ifdef ARCH_DMA_MINALIGN
 723         return ARCH_DMA_MINALIGN;
 724 #endif
 725         return 1;
 726 }
 727
 728 /* flags for the coherent memory api */
 729 #define DMA_MEMORY_EXCLUSIVE            0x01
 730
 731 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 732 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 733                                 dma_addr_t device_addr, size_t size, int flags);
 734 void dma_release_declared_memory(struct device *dev);
 735 void *dma_mark_declared_memory_occupied(struct device *dev,
 736                                         dma_addr_t device_addr, size_t size);
 737 #else
 738 static inline int
 739 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 740                             dma_addr_t device_addr, size_t size, int flags)
 741 {
 742         return -ENOSYS;
 743 }
 744
 745 static inline void
 746 dma_release_declared_memory(struct device *dev)
 747 {
 748 }
 749
 750 static inline void *
 751 dma_mark_declared_memory_occupied(struct device *dev,
 752                                   dma_addr_t device_addr, size_t size)
 753 {
 754         return ERR_PTR(-EBUSY);
 755 }
 756 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 757
 758 /*
 759  * Managed DMA API
 760  */
 761 #ifdef CONFIG_HAS_DMA
 762 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 763                                  dma_addr_t *dma_handle, gfp_t gfp);
 764 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 765                                dma_addr_t dma_handle);
 766 #else /* !CONFIG_HAS_DMA */
 767 static inline void *dmam_alloc_coherent(struct device *dev, size_t size,
 768                                         dma_addr_t *dma_handle, gfp_t gfp)
 769 { return NULL; }
 770 static inline void dmam_free_coherent(struct device *dev, size_t size,
 771                                       void *vaddr, dma_addr_t dma_handle) { }
 772 #endif /* !CONFIG_HAS_DMA */
 773
 774 extern void *dmam_alloc_attrs(struct device *dev, size_t size,
 775                               dma_addr_t *dma_handle, gfp_t gfp,
 776                               unsigned long attrs);
 777 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 778 extern int dmam_declare_coherent_memory(struct device *dev,
 779                                         phys_addr_t phys_addr,
 780                                         dma_addr_t device_addr, size_t size,
 781                                         int flags);
 782 extern void dmam_release_declared_memory(struct device *dev);
 783 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 784 static inline int dmam_declare_coherent_memory(struct device *dev,
 785                                 phys_addr_t phys_addr, dma_addr_t device_addr,
 786                                 size_t size, gfp_t gfp)
 787 {
 788         return 0;
 789 }
 790
 791 static inline void dmam_release_declared_memory(struct device *dev)
 792 {
 793 }
 794 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 795
 796 static inline void *dma_alloc_wc(struct device *dev, size_t size,
 797                                  dma_addr_t *dma_addr, gfp_t gfp)
 798 {
 799         unsigned long attrs = DMA_ATTR_NO_WARN;
 800
 801         if (gfp & __GFP_NOWARN)
 802                 attrs |= DMA_ATTR_NO_WARN;
 803
 804         return dma_alloc_attrs(dev, size, dma_addr, gfp, attrs);
 805 }
 806 #ifndef dma_alloc_writecombine
 807 #define dma_alloc_writecombine dma_alloc_wc
 808 #endif
 809
 810 static inline void dma_free_wc(struct device *dev, size_t size,
 811                                void *cpu_addr, dma_addr_t dma_addr)
 812 {
 813         return dma_free_attrs(dev, size, cpu_addr, dma_addr,
 814                               DMA_ATTR_WRITE_COMBINE);
 815 }
 816 #ifndef dma_free_writecombine
 817 #define dma_free_writecombine dma_free_wc
 818 #endif
 819
 820 static inline int dma_mmap_wc(struct device *dev,
 821                               struct vm_area_struct *vma,
 822                               void *cpu_addr, dma_addr_t dma_addr,
 823                               size_t size)
 824 {
 825         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
 826                               DMA_ATTR_WRITE_COMBINE);
 827 }
 828 #ifndef dma_mmap_writecombine
 829 #define dma_mmap_writecombine dma_mmap_wc
 830 #endif
 831
 832 #ifdef CONFIG_NEED_DMA_MAP_STATE
 833 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 834 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 835 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 836 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 837 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 838 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 839 #else
 840 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 841 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 842 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 843 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 844 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 845 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 846 #endif
 847
 848 #endif