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_noop_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
 517         if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
 518                 return cpu_addr;
 519
 520         if (!arch_dma_alloc_attrs(&dev, &flag))
 521                 return NULL;
 522         if (!ops->alloc)
 523                 return NULL;
 524
 525         cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
 526         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 527         return cpu_addr;
 528 }
 529
 530 static inline void dma_free_attrs(struct device *dev, size_t size,
 531                                      void *cpu_addr, dma_addr_t dma_handle,
 532                                      unsigned long attrs)
 533 {
 534         const struct dma_map_ops *ops = get_dma_ops(dev);
 535
 536         BUG_ON(!ops);
 537         WARN_ON(irqs_disabled());
 538
 539         if (dma_release_from_dev_coherent(dev, get_order(size), cpu_addr))
 540                 return;
 541
 542         if (!ops->free || !cpu_addr)
 543                 return;
 544
 545         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 546         ops->free(dev, size, cpu_addr, dma_handle, attrs);
 547 }
 548
 549 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 550                 dma_addr_t *dma_handle, gfp_t flag)
 551 {
 552         return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
 553 }
 554
 555 static inline void dma_free_coherent(struct device *dev, size_t size,
 556                 void *cpu_addr, dma_addr_t dma_handle)
 557 {
 558         return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
 559 }
 560
 561 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 562 {
 563         const struct dma_map_ops *ops = get_dma_ops(dev);
 564
 565         debug_dma_mapping_error(dev, dma_addr);
 566         if (ops->mapping_error)
 567                 return ops->mapping_error(dev, dma_addr);
 568         return 0;
 569 }
 570
 571 static inline void dma_check_mask(struct device *dev, u64 mask)
 572 {
 573         if (sme_active() && (mask < (((u64)sme_get_me_mask() << 1) - 1)))
 574                 dev_warn(dev, "SME is active, device will require DMA bounce buffers\n");
 575 }
 576
 577 static inline int dma_supported(struct device *dev, u64 mask)
 578 {
 579         const struct dma_map_ops *ops = get_dma_ops(dev);
 580
 581         if (!ops)
 582                 return 0;
 583         if (!ops->dma_supported)
 584                 return 1;
 585         return ops->dma_supported(dev, mask);
 586 }
 587
 588 #ifndef HAVE_ARCH_DMA_SET_MASK
 589 static inline int dma_set_mask(struct device *dev, u64 mask)
 590 {
 591         if (!dev->dma_mask || !dma_supported(dev, mask))
 592                 return -EIO;
 593
 594         dma_check_mask(dev, mask);
 595
 596         *dev->dma_mask = mask;
 597         return 0;
 598 }
 599 #endif
 600
 601 static inline u64 dma_get_mask(struct device *dev)
 602 {
 603         if (dev && dev->dma_mask && *dev->dma_mask)
 604                 return *dev->dma_mask;
 605         return DMA_BIT_MASK(32);
 606 }
 607
 608 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
 609 int dma_set_coherent_mask(struct device *dev, u64 mask);
 610 #else
 611 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
 612 {
 613         if (!dma_supported(dev, mask))
 614                 return -EIO;
 615
 616         dma_check_mask(dev, mask);
 617
 618         dev->coherent_dma_mask = mask;
 619         return 0;
 620 }
 621 #endif
 622
 623 /*
 624  * Set both the DMA mask and the coherent DMA mask to the same thing.
 625  * Note that we don't check the return value from dma_set_coherent_mask()
 626  * as the DMA API guarantees that the coherent DMA mask can be set to
 627  * the same or smaller than the streaming DMA mask.
 628  */
 629 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 630 {
 631         int rc = dma_set_mask(dev, mask);
 632         if (rc == 0)
 633                 dma_set_coherent_mask(dev, mask);
 634         return rc;
 635 }
 636
 637 /*
 638  * Similar to the above, except it deals with the case where the device
 639  * does not have dev->dma_mask appropriately setup.
 640  */
 641 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 642 {
 643         dev->dma_mask = &dev->coherent_dma_mask;
 644         return dma_set_mask_and_coherent(dev, mask);
 645 }
 646
 647 extern u64 dma_get_required_mask(struct device *dev);
 648
 649 #ifndef arch_setup_dma_ops
 650 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 651                                       u64 size, const struct iommu_ops *iommu,
 652                                       bool coherent) { }
 653 #endif
 654
 655 #ifndef arch_teardown_dma_ops
 656 static inline void arch_teardown_dma_ops(struct device *dev) { }
 657 #endif
 658
 659 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 660 {
 661         if (dev->dma_parms && dev->dma_parms->max_segment_size)
 662                 return dev->dma_parms->max_segment_size;
 663         return SZ_64K;
 664 }
 665
 666 static inline unsigned int dma_set_max_seg_size(struct device *dev,
 667                                                 unsigned int size)
 668 {
 669         if (dev->dma_parms) {
 670                 dev->dma_parms->max_segment_size = size;
 671                 return 0;
 672         }
 673         return -EIO;
 674 }
 675
 676 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 677 {
 678         if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
 679                 return dev->dma_parms->segment_boundary_mask;
 680         return DMA_BIT_MASK(32);
 681 }
 682
 683 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 684 {
 685         if (dev->dma_parms) {
 686                 dev->dma_parms->segment_boundary_mask = mask;
 687                 return 0;
 688         }
 689         return -EIO;
 690 }
 691
 692 #ifndef dma_max_pfn
 693 static inline unsigned long dma_max_pfn(struct device *dev)
 694 {
 695         return *dev->dma_mask >> PAGE_SHIFT;
 696 }
 697 #endif
 698
 699 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 700                                         dma_addr_t *dma_handle, gfp_t flag)
 701 {
 702         void *ret = dma_alloc_coherent(dev, size, dma_handle,
 703                                        flag | __GFP_ZERO);
 704         return ret;
 705 }
 706
 707 static inline int dma_get_cache_alignment(void)
 708 {
 709 #ifdef ARCH_DMA_MINALIGN
 710         return ARCH_DMA_MINALIGN;
 711 #endif
 712         return 1;
 713 }
 714
 715 /* flags for the coherent memory api */
 716 #define DMA_MEMORY_EXCLUSIVE            0x01
 717
 718 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 719 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 720                                 dma_addr_t device_addr, size_t size, int flags);
 721 void dma_release_declared_memory(struct device *dev);
 722 void *dma_mark_declared_memory_occupied(struct device *dev,
 723                                         dma_addr_t device_addr, size_t size);
 724 #else
 725 static inline int
 726 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 727                             dma_addr_t device_addr, size_t size, int flags)
 728 {
 729         return -ENOSYS;
 730 }
 731
 732 static inline void
 733 dma_release_declared_memory(struct device *dev)
 734 {
 735 }
 736
 737 static inline void *
 738 dma_mark_declared_memory_occupied(struct device *dev,
 739                                   dma_addr_t device_addr, size_t size)
 740 {
 741         return ERR_PTR(-EBUSY);
 742 }
 743 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 744
 745 #ifdef CONFIG_HAS_DMA
 746 int dma_configure(struct device *dev);
 747 void dma_deconfigure(struct device *dev);
 748 #else
 749 static inline int dma_configure(struct device *dev)
 750 {
 751         return 0;
 752 }
 753
 754 static inline void dma_deconfigure(struct device *dev) {}
 755 #endif
 756
 757 /*
 758  * Managed DMA API
 759  */
 760 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 761                                  dma_addr_t *dma_handle, gfp_t gfp);
 762 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 763                                dma_addr_t dma_handle);
 764 extern void *dmam_alloc_attrs(struct device *dev, size_t size,
 765                               dma_addr_t *dma_handle, gfp_t gfp,
 766                               unsigned long attrs);
 767 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 768 extern int dmam_declare_coherent_memory(struct device *dev,
 769                                         phys_addr_t phys_addr,
 770                                         dma_addr_t device_addr, size_t size,
 771                                         int flags);
 772 extern void dmam_release_declared_memory(struct device *dev);
 773 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 774 static inline int dmam_declare_coherent_memory(struct device *dev,
 775                                 phys_addr_t phys_addr, dma_addr_t device_addr,
 776                                 size_t size, gfp_t gfp)
 777 {
 778         return 0;
 779 }
 780
 781 static inline void dmam_release_declared_memory(struct device *dev)
 782 {
 783 }
 784 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 785
 786 static inline void *dma_alloc_wc(struct device *dev, size_t size,
 787                                  dma_addr_t *dma_addr, gfp_t gfp)
 788 {
 789         return dma_alloc_attrs(dev, size, dma_addr, gfp,
 790                                DMA_ATTR_WRITE_COMBINE);
 791 }
 792 #ifndef dma_alloc_writecombine
 793 #define dma_alloc_writecombine dma_alloc_wc
 794 #endif
 795
 796 static inline void dma_free_wc(struct device *dev, size_t size,
 797                                void *cpu_addr, dma_addr_t dma_addr)
 798 {
 799         return dma_free_attrs(dev, size, cpu_addr, dma_addr,
 800                               DMA_ATTR_WRITE_COMBINE);
 801 }
 802 #ifndef dma_free_writecombine
 803 #define dma_free_writecombine dma_free_wc
 804 #endif
 805
 806 static inline int dma_mmap_wc(struct device *dev,
 807                               struct vm_area_struct *vma,
 808                               void *cpu_addr, dma_addr_t dma_addr,
 809                               size_t size)
 810 {
 811         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
 812                               DMA_ATTR_WRITE_COMBINE);
 813 }
 814 #ifndef dma_mmap_writecombine
 815 #define dma_mmap_writecombine dma_mmap_wc
 816 #endif
 817
 818 #if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
 819 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 820 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 821 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 822 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 823 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 824 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 825 #else
 826 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 827 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 828 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 829 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 830 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 831 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 832 #endif
 833
 834 #endif