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 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 134         u64 (*get_required_mask)(struct device *dev);
 135 #endif
 136         int is_phys;
 137 };
 138
 139 extern const struct dma_map_ops dma_direct_ops;
 140 extern const struct dma_map_ops dma_virt_ops;
 141
 142 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
 143
 144 #define DMA_MASK_NONE   0x0ULL
 145
 146 static inline int valid_dma_direction(int dma_direction)
 147 {
 148         return ((dma_direction == DMA_BIDIRECTIONAL) ||
 149                 (dma_direction == DMA_TO_DEVICE) ||
 150                 (dma_direction == DMA_FROM_DEVICE));
 151 }
 152
 153 static inline int is_device_dma_capable(struct device *dev)
 154 {
 155         return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
 156 }
 157
 158 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 159 /*
 160  * These three functions are only for dma allocator.
 161  * Don't use them in device drivers.
 162  */
 163 int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
 164                                        dma_addr_t *dma_handle, void **ret);
 165 int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
 166
 167 int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
 168                             void *cpu_addr, size_t size, int *ret);
 169
 170 void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle);
 171 int dma_release_from_global_coherent(int order, void *vaddr);
 172 int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
 173                                   size_t size, int *ret);
 174
 175 #else
 176 #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
 177 #define dma_release_from_dev_coherent(dev, order, vaddr) (0)
 178 #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
 179
 180 static inline void *dma_alloc_from_global_coherent(ssize_t size,
 181                                                    dma_addr_t *dma_handle)
 182 {
 183         return NULL;
 184 }
 185
 186 static inline int dma_release_from_global_coherent(int order, void *vaddr)
 187 {
 188         return 0;
 189 }
 190
 191 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
 192                                                 void *cpu_addr, size_t size,
 193                                                 int *ret)
 194 {
 195         return 0;
 196 }
 197 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 198
 199 #ifdef CONFIG_HAS_DMA
 200 #include <asm/dma-mapping.h>
 201 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 202 {
 203         if (dev && dev->dma_ops)
 204                 return dev->dma_ops;
 205         return get_arch_dma_ops(dev ? dev->bus : NULL);
 206 }
 207
 208 static inline void set_dma_ops(struct device *dev,
 209                                const struct dma_map_ops *dma_ops)
 210 {
 211         dev->dma_ops = dma_ops;
 212 }
 213 #else
 214 /*
 215  * Define the dma api to allow compilation but not linking of
 216  * dma dependent code.  Code that depends on the dma-mapping
 217  * API needs to set 'depends on HAS_DMA' in its Kconfig
 218  */
 219 extern const struct dma_map_ops bad_dma_ops;
 220 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 221 {
 222         return &bad_dma_ops;
 223 }
 224 #endif
 225
 226 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
 227                                               size_t size,
 228                                               enum dma_data_direction dir,
 229                                               unsigned long attrs)
 230 {
 231         const struct dma_map_ops *ops = get_dma_ops(dev);
 232         dma_addr_t addr;
 233
 234         BUG_ON(!valid_dma_direction(dir));
 235         addr = ops->map_page(dev, virt_to_page(ptr),
 236                              offset_in_page(ptr), size,
 237                              dir, attrs);
 238         debug_dma_map_page(dev, virt_to_page(ptr),
 239                            offset_in_page(ptr), size,
 240                            dir, addr, true);
 241         return addr;
 242 }
 243
 244 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
 245                                           size_t size,
 246                                           enum dma_data_direction dir,
 247                                           unsigned long attrs)
 248 {
 249         const struct dma_map_ops *ops = get_dma_ops(dev);
 250
 251         BUG_ON(!valid_dma_direction(dir));
 252         if (ops->unmap_page)
 253                 ops->unmap_page(dev, addr, size, dir, attrs);
 254         debug_dma_unmap_page(dev, addr, size, dir, true);
 255 }
 256
 257 /*
 258  * dma_maps_sg_attrs returns 0 on error and > 0 on success.
 259  * It should never return a value < 0.
 260  */
 261 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 262                                    int nents, enum dma_data_direction dir,
 263                                    unsigned long attrs)
 264 {
 265         const struct dma_map_ops *ops = get_dma_ops(dev);
 266         int ents;
 267
 268         BUG_ON(!valid_dma_direction(dir));
 269         ents = ops->map_sg(dev, sg, nents, dir, attrs);
 270         BUG_ON(ents < 0);
 271         debug_dma_map_sg(dev, sg, nents, ents, dir);
 272
 273         return ents;
 274 }
 275
 276 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 277                                       int nents, enum dma_data_direction dir,
 278                                       unsigned long attrs)
 279 {
 280         const struct dma_map_ops *ops = get_dma_ops(dev);
 281
 282         BUG_ON(!valid_dma_direction(dir));
 283         debug_dma_unmap_sg(dev, sg, nents, dir);
 284         if (ops->unmap_sg)
 285                 ops->unmap_sg(dev, sg, nents, dir, attrs);
 286 }
 287
 288 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 289                                             struct page *page,
 290                                             size_t offset, size_t size,
 291                                             enum dma_data_direction dir,
 292                                             unsigned long attrs)
 293 {
 294         const struct dma_map_ops *ops = get_dma_ops(dev);
 295         dma_addr_t addr;
 296
 297         BUG_ON(!valid_dma_direction(dir));
 298         addr = ops->map_page(dev, page, offset, size, dir, attrs);
 299         debug_dma_map_page(dev, page, offset, size, dir, addr, false);
 300
 301         return addr;
 302 }
 303
 304 static inline void dma_unmap_page_attrs(struct device *dev,
 305                                         dma_addr_t addr, size_t size,
 306                                         enum dma_data_direction dir,
 307                                         unsigned long attrs)
 308 {
 309         const struct dma_map_ops *ops = get_dma_ops(dev);
 310
 311         BUG_ON(!valid_dma_direction(dir));
 312         if (ops->unmap_page)
 313                 ops->unmap_page(dev, addr, size, dir, attrs);
 314         debug_dma_unmap_page(dev, addr, size, dir, false);
 315 }
 316
 317 static inline dma_addr_t dma_map_resource(struct device *dev,
 318                                           phys_addr_t phys_addr,
 319                                           size_t size,
 320                                           enum dma_data_direction dir,
 321                                           unsigned long attrs)
 322 {
 323         const struct dma_map_ops *ops = get_dma_ops(dev);
 324         dma_addr_t addr;
 325
 326         BUG_ON(!valid_dma_direction(dir));
 327
 328         /* Don't allow RAM to be mapped */
 329         BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
 330
 331         addr = phys_addr;
 332         if (ops->map_resource)
 333                 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
 334
 335         debug_dma_map_resource(dev, phys_addr, size, dir, addr);
 336
 337         return addr;
 338 }
 339
 340 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
 341                                       size_t size, enum dma_data_direction dir,
 342                                       unsigned long attrs)
 343 {
 344         const struct dma_map_ops *ops = get_dma_ops(dev);
 345
 346         BUG_ON(!valid_dma_direction(dir));
 347         if (ops->unmap_resource)
 348                 ops->unmap_resource(dev, addr, size, dir, attrs);
 349         debug_dma_unmap_resource(dev, addr, size, dir);
 350 }
 351
 352 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 353                                            size_t size,
 354                                            enum dma_data_direction dir)
 355 {
 356         const struct dma_map_ops *ops = get_dma_ops(dev);
 357
 358         BUG_ON(!valid_dma_direction(dir));
 359         if (ops->sync_single_for_cpu)
 360                 ops->sync_single_for_cpu(dev, addr, size, dir);
 361         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 362 }
 363
 364 static inline void dma_sync_single_for_device(struct device *dev,
 365                                               dma_addr_t addr, size_t size,
 366                                               enum dma_data_direction dir)
 367 {
 368         const struct dma_map_ops *ops = get_dma_ops(dev);
 369
 370         BUG_ON(!valid_dma_direction(dir));
 371         if (ops->sync_single_for_device)
 372                 ops->sync_single_for_device(dev, addr, size, dir);
 373         debug_dma_sync_single_for_device(dev, addr, size, dir);
 374 }
 375
 376 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 377                                                  dma_addr_t addr,
 378                                                  unsigned long offset,
 379                                                  size_t size,
 380                                                  enum dma_data_direction dir)
 381 {
 382         const struct dma_map_ops *ops = get_dma_ops(dev);
 383
 384         BUG_ON(!valid_dma_direction(dir));
 385         if (ops->sync_single_for_cpu)
 386                 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
 387         debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
 388 }
 389
 390 static inline void dma_sync_single_range_for_device(struct device *dev,
 391                                                     dma_addr_t addr,
 392                                                     unsigned long offset,
 393                                                     size_t size,
 394                                                     enum dma_data_direction dir)
 395 {
 396         const struct dma_map_ops *ops = get_dma_ops(dev);
 397
 398         BUG_ON(!valid_dma_direction(dir));
 399         if (ops->sync_single_for_device)
 400                 ops->sync_single_for_device(dev, addr + offset, size, dir);
 401         debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
 402 }
 403
 404 static inline void
 405 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 406                     int nelems, enum dma_data_direction dir)
 407 {
 408         const struct dma_map_ops *ops = get_dma_ops(dev);
 409
 410         BUG_ON(!valid_dma_direction(dir));
 411         if (ops->sync_sg_for_cpu)
 412                 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
 413         debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 414 }
 415
 416 static inline void
 417 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 418                        int nelems, enum dma_data_direction dir)
 419 {
 420         const struct dma_map_ops *ops = get_dma_ops(dev);
 421
 422         BUG_ON(!valid_dma_direction(dir));
 423         if (ops->sync_sg_for_device)
 424                 ops->sync_sg_for_device(dev, sg, nelems, dir);
 425         debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 426
 427 }
 428
 429 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
 430 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
 431 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
 432 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
 433 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
 434 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
 435
 436 static inline void
 437 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 438                 enum dma_data_direction dir)
 439 {
 440         const struct dma_map_ops *ops = get_dma_ops(dev);
 441
 442         BUG_ON(!valid_dma_direction(dir));
 443         if (ops->cache_sync)
 444                 ops->cache_sync(dev, vaddr, size, dir);
 445 }
 446
 447 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 448                            void *cpu_addr, dma_addr_t dma_addr, size_t size);
 449
 450 void *dma_common_contiguous_remap(struct page *page, size_t size,
 451                         unsigned long vm_flags,
 452                         pgprot_t prot, const void *caller);
 453
 454 void *dma_common_pages_remap(struct page **pages, size_t size,
 455                         unsigned long vm_flags, pgprot_t prot,
 456                         const void *caller);
 457 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
 458
 459 /**
 460  * dma_mmap_attrs - map a coherent DMA allocation into user space
 461  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 462  * @vma: vm_area_struct describing requested user mapping
 463  * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 464  * @handle: device-view address returned from dma_alloc_attrs
 465  * @size: size of memory originally requested in dma_alloc_attrs
 466  * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 467  *
 468  * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 469  * into user space.  The coherent DMA buffer must not be freed by the
 470  * driver until the user space mapping has been released.
 471  */
 472 static inline int
 473 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
 474                dma_addr_t dma_addr, size_t size, unsigned long attrs)
 475 {
 476         const struct dma_map_ops *ops = get_dma_ops(dev);
 477         BUG_ON(!ops);
 478         if (ops->mmap)
 479                 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
 480         return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
 481 }
 482
 483 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
 484
 485 int
 486 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 487                        void *cpu_addr, dma_addr_t dma_addr, size_t size);
 488
 489 static inline int
 490 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
 491                       dma_addr_t dma_addr, size_t size,
 492                       unsigned long attrs)
 493 {
 494         const struct dma_map_ops *ops = get_dma_ops(dev);
 495         BUG_ON(!ops);
 496         if (ops->get_sgtable)
 497                 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
 498                                         attrs);
 499         return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
 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, flag) (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         /*
 522          * Let the implementation decide on the zone to allocate from, and
 523          * decide on the way of zeroing the memory given that the memory
 524          * returned should always be zeroed.
 525          */
 526         flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM | __GFP_ZERO);
 527
 528         if (!arch_dma_alloc_attrs(&dev, &flag))
 529                 return NULL;
 530         if (!ops->alloc)
 531                 return NULL;
 532
 533         cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
 534         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 535         return cpu_addr;
 536 }
 537
 538 static inline void dma_free_attrs(struct device *dev, size_t size,
 539                                      void *cpu_addr, dma_addr_t dma_handle,
 540                                      unsigned long attrs)
 541 {
 542         const struct dma_map_ops *ops = get_dma_ops(dev);
 543
 544         BUG_ON(!ops);
 545         WARN_ON(irqs_disabled());
 546
 547         if (dma_release_from_dev_coherent(dev, get_order(size), cpu_addr))
 548                 return;
 549
 550         if (!ops->free || !cpu_addr)
 551                 return;
 552
 553         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 554         ops->free(dev, size, cpu_addr, dma_handle, attrs);
 555 }
 556
 557 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 558                 dma_addr_t *dma_handle, gfp_t flag)
 559 {
 560         return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
 561 }
 562
 563 static inline void dma_free_coherent(struct device *dev, size_t size,
 564                 void *cpu_addr, dma_addr_t dma_handle)
 565 {
 566         return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
 567 }
 568
 569 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 570 {
 571         const struct dma_map_ops *ops = get_dma_ops(dev);
 572
 573         debug_dma_mapping_error(dev, dma_addr);
 574         if (ops->mapping_error)
 575                 return ops->mapping_error(dev, dma_addr);
 576         return 0;
 577 }
 578
 579 /*
 580  * This is a hack for the legacy x86 forbid_dac and iommu_sac_force. Please
 581  * don't use this is new code.
 582  */
 583 #ifndef arch_dma_supported
 584 #define arch_dma_supported(dev, mask)   (1)
 585 #endif
 586
 587 static inline void dma_check_mask(struct device *dev, u64 mask)
 588 {
 589         if (sme_active() && (mask < (((u64)sme_get_me_mask() << 1) - 1)))
 590                 dev_warn(dev, "SME is active, device will require DMA bounce buffers\n");
 591 }
 592
 593 static inline int dma_supported(struct device *dev, u64 mask)
 594 {
 595         const struct dma_map_ops *ops = get_dma_ops(dev);
 596
 597         if (!ops)
 598                 return 0;
 599         if (!arch_dma_supported(dev, mask))
 600                 return 0;
 601
 602         if (!ops->dma_supported)
 603                 return 1;
 604         return ops->dma_supported(dev, mask);
 605 }
 606
 607 #ifndef HAVE_ARCH_DMA_SET_MASK
 608 static inline int dma_set_mask(struct device *dev, u64 mask)
 609 {
 610         if (!dev->dma_mask || !dma_supported(dev, mask))
 611                 return -EIO;
 612
 613         dma_check_mask(dev, mask);
 614
 615         *dev->dma_mask = mask;
 616         return 0;
 617 }
 618 #endif
 619
 620 static inline u64 dma_get_mask(struct device *dev)
 621 {
 622         if (dev && dev->dma_mask && *dev->dma_mask)
 623                 return *dev->dma_mask;
 624         return DMA_BIT_MASK(32);
 625 }
 626
 627 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
 628 int dma_set_coherent_mask(struct device *dev, u64 mask);
 629 #else
 630 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
 631 {
 632         if (!dma_supported(dev, mask))
 633                 return -EIO;
 634
 635         dma_check_mask(dev, mask);
 636
 637         dev->coherent_dma_mask = mask;
 638         return 0;
 639 }
 640 #endif
 641
 642 /*
 643  * Set both the DMA mask and the coherent DMA mask to the same thing.
 644  * Note that we don't check the return value from dma_set_coherent_mask()
 645  * as the DMA API guarantees that the coherent DMA mask can be set to
 646  * the same or smaller than the streaming DMA mask.
 647  */
 648 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 649 {
 650         int rc = dma_set_mask(dev, mask);
 651         if (rc == 0)
 652                 dma_set_coherent_mask(dev, mask);
 653         return rc;
 654 }
 655
 656 /*
 657  * Similar to the above, except it deals with the case where the device
 658  * does not have dev->dma_mask appropriately setup.
 659  */
 660 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 661 {
 662         dev->dma_mask = &dev->coherent_dma_mask;
 663         return dma_set_mask_and_coherent(dev, mask);
 664 }
 665
 666 extern u64 dma_get_required_mask(struct device *dev);
 667
 668 #ifndef arch_setup_dma_ops
 669 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 670                                       u64 size, const struct iommu_ops *iommu,
 671                                       bool coherent) { }
 672 #endif
 673
 674 #ifndef arch_teardown_dma_ops
 675 static inline void arch_teardown_dma_ops(struct device *dev) { }
 676 #endif
 677
 678 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 679 {
 680         if (dev->dma_parms && dev->dma_parms->max_segment_size)
 681                 return dev->dma_parms->max_segment_size;
 682         return SZ_64K;
 683 }
 684
 685 static inline unsigned int dma_set_max_seg_size(struct device *dev,
 686                                                 unsigned int size)
 687 {
 688         if (dev->dma_parms) {
 689                 dev->dma_parms->max_segment_size = size;
 690                 return 0;
 691         }
 692         return -EIO;
 693 }
 694
 695 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 696 {
 697         if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
 698                 return dev->dma_parms->segment_boundary_mask;
 699         return DMA_BIT_MASK(32);
 700 }
 701
 702 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 703 {
 704         if (dev->dma_parms) {
 705                 dev->dma_parms->segment_boundary_mask = mask;
 706                 return 0;
 707         }
 708         return -EIO;
 709 }
 710
 711 #ifndef dma_max_pfn
 712 static inline unsigned long dma_max_pfn(struct device *dev)
 713 {
 714         return (*dev->dma_mask >> PAGE_SHIFT) + dev->dma_pfn_offset;
 715 }
 716 #endif
 717
 718 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 719                                         dma_addr_t *dma_handle, gfp_t flag)
 720 {
 721         void *ret = dma_alloc_coherent(dev, size, dma_handle,
 722                                        flag | __GFP_ZERO);
 723         return ret;
 724 }
 725
 726 static inline int dma_get_cache_alignment(void)
 727 {
 728 #ifdef ARCH_DMA_MINALIGN
 729         return ARCH_DMA_MINALIGN;
 730 #endif
 731         return 1;
 732 }
 733
 734 /* flags for the coherent memory api */
 735 #define DMA_MEMORY_EXCLUSIVE            0x01
 736
 737 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 738 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 739                                 dma_addr_t device_addr, size_t size, int flags);
 740 void dma_release_declared_memory(struct device *dev);
 741 void *dma_mark_declared_memory_occupied(struct device *dev,
 742                                         dma_addr_t device_addr, size_t size);
 743 #else
 744 static inline int
 745 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 746                             dma_addr_t device_addr, size_t size, int flags)
 747 {
 748         return -ENOSYS;
 749 }
 750
 751 static inline void
 752 dma_release_declared_memory(struct device *dev)
 753 {
 754 }
 755
 756 static inline void *
 757 dma_mark_declared_memory_occupied(struct device *dev,
 758                                   dma_addr_t device_addr, size_t size)
 759 {
 760         return ERR_PTR(-EBUSY);
 761 }
 762 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 763
 764 #ifdef CONFIG_HAS_DMA
 765 int dma_configure(struct device *dev);
 766 void dma_deconfigure(struct device *dev);
 767 #else
 768 static inline int dma_configure(struct device *dev)
 769 {
 770         return 0;
 771 }
 772
 773 static inline void dma_deconfigure(struct device *dev) {}
 774 #endif
 775
 776 /*
 777  * Managed DMA API
 778  */
 779 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 780                                  dma_addr_t *dma_handle, gfp_t gfp);
 781 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 782                                dma_addr_t dma_handle);
 783 extern void *dmam_alloc_attrs(struct device *dev, size_t size,
 784                               dma_addr_t *dma_handle, gfp_t gfp,
 785                               unsigned long attrs);
 786 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 787 extern int dmam_declare_coherent_memory(struct device *dev,
 788                                         phys_addr_t phys_addr,
 789                                         dma_addr_t device_addr, size_t size,
 790                                         int flags);
 791 extern void dmam_release_declared_memory(struct device *dev);
 792 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 793 static inline int dmam_declare_coherent_memory(struct device *dev,
 794                                 phys_addr_t phys_addr, dma_addr_t device_addr,
 795                                 size_t size, gfp_t gfp)
 796 {
 797         return 0;
 798 }
 799
 800 static inline void dmam_release_declared_memory(struct device *dev)
 801 {
 802 }
 803 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 804
 805 static inline void *dma_alloc_wc(struct device *dev, size_t size,
 806                                  dma_addr_t *dma_addr, gfp_t gfp)
 807 {
 808         return dma_alloc_attrs(dev, size, dma_addr, gfp,
 809                                DMA_ATTR_WRITE_COMBINE);
 810 }
 811 #ifndef dma_alloc_writecombine
 812 #define dma_alloc_writecombine dma_alloc_wc
 813 #endif
 814
 815 static inline void dma_free_wc(struct device *dev, size_t size,
 816                                void *cpu_addr, dma_addr_t dma_addr)
 817 {
 818         return dma_free_attrs(dev, size, cpu_addr, dma_addr,
 819                               DMA_ATTR_WRITE_COMBINE);
 820 }
 821 #ifndef dma_free_writecombine
 822 #define dma_free_writecombine dma_free_wc
 823 #endif
 824
 825 static inline int dma_mmap_wc(struct device *dev,
 826                               struct vm_area_struct *vma,
 827                               void *cpu_addr, dma_addr_t dma_addr,
 828                               size_t size)
 829 {
 830         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
 831                               DMA_ATTR_WRITE_COMBINE);
 832 }
 833 #ifndef dma_mmap_writecombine
 834 #define dma_mmap_writecombine dma_mmap_wc
 835 #endif
 836
 837 #if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
 838 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 839 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 840 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 841 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 842 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 843 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 844 #else
 845 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 846 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 847 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 848 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 849 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 850 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 851 #endif
 852
 853 #endif