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/kmemcheck.h>
  13 #include <linux/bug.h>
  14 #include <linux/mem_encrypt.h>
  15
  16 /**
  17  * List of possible attributes associated with a DMA mapping. The semantics
  18  * of each attribute should be defined in Documentation/DMA-attributes.txt.
  19  *
  20  * DMA_ATTR_WRITE_BARRIER: DMA to a memory region with this attribute
  21  * forces all pending DMA writes to complete.
  22  */
  23 #define DMA_ATTR_WRITE_BARRIER          (1UL << 0)
  24 /*
  25  * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping
  26  * may be weakly ordered, that is that reads and writes may pass each other.
  27  */
  28 #define DMA_ATTR_WEAK_ORDERING          (1UL << 1)
  29 /*
  30  * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be
  31  * buffered to improve performance.
  32  */
  33 #define DMA_ATTR_WRITE_COMBINE          (1UL << 2)
  34 /*
  35  * DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either
  36  * consistent or non-consistent memory as it sees fit.
  37  */
  38 #define DMA_ATTR_NON_CONSISTENT         (1UL << 3)
  39 /*
  40  * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
  41  * virtual mapping for the allocated buffer.
  42  */
  43 #define DMA_ATTR_NO_KERNEL_MAPPING      (1UL << 4)
  44 /*
  45  * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of
  46  * the CPU cache for the given buffer assuming that it has been already
  47  * transferred to 'device' domain.
  48  */
  49 #define DMA_ATTR_SKIP_CPU_SYNC          (1UL << 5)
  50 /*
  51  * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer
  52  * in physical memory.
  53  */
  54 #define DMA_ATTR_FORCE_CONTIGUOUS       (1UL << 6)
  55 /*
  56  * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem
  57  * that it's probably not worth the time to try to allocate memory to in a way
  58  * that gives better TLB efficiency.
  59  */
  60 #define DMA_ATTR_ALLOC_SINGLE_PAGES     (1UL << 7)
  61 /*
  62  * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress
  63  * allocation failure reports (similarly to __GFP_NOWARN).
  64  */
  65 #define DMA_ATTR_NO_WARN        (1UL << 8)
  66
  67 /*
  68  * DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully
  69  * accessible at an elevated privilege level (and ideally inaccessible or
  70  * at least read-only at lesser-privileged levels).
  71  */
  72 #define DMA_ATTR_PRIVILEGED             (1UL << 9)
  73
  74 /*
  75  * A dma_addr_t can hold any valid DMA or bus address for the platform.
  76  * It can be given to a device to use as a DMA source or target.  A CPU cannot
  77  * reference a dma_addr_t directly because there may be translation between
  78  * its physical address space and the bus address space.
  79  */
  80 struct dma_map_ops {
  81         void* (*alloc)(struct device *dev, size_t size,
  82                                 dma_addr_t *dma_handle, gfp_t gfp,
  83                                 unsigned long attrs);
  84         void (*free)(struct device *dev, size_t size,
  85                               void *vaddr, dma_addr_t dma_handle,
  86                               unsigned long attrs);
  87         int (*mmap)(struct device *, struct vm_area_struct *,
  88                           void *, dma_addr_t, size_t,
  89                           unsigned long attrs);
  90
  91         int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
  92                            dma_addr_t, size_t, unsigned long attrs);
  93
  94         dma_addr_t (*map_page)(struct device *dev, struct page *page,
  95                                unsigned long offset, size_t size,
  96                                enum dma_data_direction dir,
  97                                unsigned long attrs);
  98         void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
  99                            size_t size, enum dma_data_direction dir,
 100                            unsigned long attrs);
 101         /*
 102          * map_sg returns 0 on error and a value > 0 on success.
 103          * It should never return a value < 0.
 104          */
 105         int (*map_sg)(struct device *dev, struct scatterlist *sg,
 106                       int nents, enum dma_data_direction dir,
 107                       unsigned long attrs);
 108         void (*unmap_sg)(struct device *dev,
 109                          struct scatterlist *sg, int nents,
 110                          enum dma_data_direction dir,
 111                          unsigned long attrs);
 112         dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
 113                                size_t size, enum dma_data_direction dir,
 114                                unsigned long attrs);
 115         void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
 116                            size_t size, enum dma_data_direction dir,
 117                            unsigned long attrs);
 118         void (*sync_single_for_cpu)(struct device *dev,
 119                                     dma_addr_t dma_handle, size_t size,
 120                                     enum dma_data_direction dir);
 121         void (*sync_single_for_device)(struct device *dev,
 122                                        dma_addr_t dma_handle, size_t size,
 123                                        enum dma_data_direction dir);
 124         void (*sync_sg_for_cpu)(struct device *dev,
 125                                 struct scatterlist *sg, int nents,
 126                                 enum dma_data_direction dir);
 127         void (*sync_sg_for_device)(struct device *dev,
 128                                    struct scatterlist *sg, int nents,
 129                                    enum dma_data_direction dir);
 130         int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
 131         int (*dma_supported)(struct device *dev, u64 mask);
 132 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 133         u64 (*get_required_mask)(struct device *dev);
 134 #endif
 135         int is_phys;
 136 };
 137
 138 extern const struct dma_map_ops dma_noop_ops;
 139 extern const struct dma_map_ops dma_virt_ops;
 140
 141 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
 142
 143 #define DMA_MASK_NONE   0x0ULL
 144
 145 static inline int valid_dma_direction(int dma_direction)
 146 {
 147         return ((dma_direction == DMA_BIDIRECTIONAL) ||
 148                 (dma_direction == DMA_TO_DEVICE) ||
 149                 (dma_direction == DMA_FROM_DEVICE));
 150 }
 151
 152 static inline int is_device_dma_capable(struct device *dev)
 153 {
 154         return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
 155 }
 156
 157 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 158 /*
 159  * These three functions are only for dma allocator.
 160  * Don't use them in device drivers.
 161  */
 162 int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
 163                                        dma_addr_t *dma_handle, void **ret);
 164 int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
 165
 166 int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
 167                             void *cpu_addr, size_t size, int *ret);
 168
 169 void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle);
 170 int dma_release_from_global_coherent(int order, void *vaddr);
 171 int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
 172                                   size_t size, int *ret);
 173
 174 #else
 175 #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
 176 #define dma_release_from_dev_coherent(dev, order, vaddr) (0)
 177 #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
 178
 179 static inline void *dma_alloc_from_global_coherent(ssize_t size,
 180                                                    dma_addr_t *dma_handle)
 181 {
 182         return NULL;
 183 }
 184
 185 static inline int dma_release_from_global_coherent(int order, void *vaddr)
 186 {
 187         return 0;
 188 }
 189
 190 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
 191                                                 void *cpu_addr, size_t size,
 192                                                 int *ret)
 193 {
 194         return 0;
 195 }
 196 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 197
 198 #ifdef CONFIG_HAS_DMA
 199 #include <asm/dma-mapping.h>
 200 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 201 {
 202         if (dev && dev->dma_ops)
 203                 return dev->dma_ops;
 204         return get_arch_dma_ops(dev ? dev->bus : NULL);
 205 }
 206
 207 static inline void set_dma_ops(struct device *dev,
 208                                const struct dma_map_ops *dma_ops)
 209 {
 210         dev->dma_ops = dma_ops;
 211 }
 212 #else
 213 /*
 214  * Define the dma api to allow compilation but not linking of
 215  * dma dependent code.  Code that depends on the dma-mapping
 216  * API needs to set 'depends on HAS_DMA' in its Kconfig
 217  */
 218 extern const struct dma_map_ops bad_dma_ops;
 219 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 220 {
 221         return &bad_dma_ops;
 222 }
 223 #endif
 224
 225 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
 226                                               size_t size,
 227                                               enum dma_data_direction dir,
 228                                               unsigned long attrs)
 229 {
 230         const struct dma_map_ops *ops = get_dma_ops(dev);
 231         dma_addr_t addr;
 232
 233         kmemcheck_mark_initialized(ptr, size);
 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 i, ents;
 267         struct scatterlist *s;
 268
 269         for_each_sg(sg, s, nents, i)
 270                 kmemcheck_mark_initialized(sg_virt(s), s->length);
 271         BUG_ON(!valid_dma_direction(dir));
 272         ents = ops->map_sg(dev, sg, nents, dir, attrs);
 273         BUG_ON(ents < 0);
 274         debug_dma_map_sg(dev, sg, nents, ents, dir);
 275
 276         return ents;
 277 }
 278
 279 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 280                                       int nents, enum dma_data_direction dir,
 281                                       unsigned long attrs)
 282 {
 283         const struct dma_map_ops *ops = get_dma_ops(dev);
 284
 285         BUG_ON(!valid_dma_direction(dir));
 286         debug_dma_unmap_sg(dev, sg, nents, dir);
 287         if (ops->unmap_sg)
 288                 ops->unmap_sg(dev, sg, nents, dir, attrs);
 289 }
 290
 291 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 292                                             struct page *page,
 293                                             size_t offset, size_t size,
 294                                             enum dma_data_direction dir,
 295                                             unsigned long attrs)
 296 {
 297         const struct dma_map_ops *ops = get_dma_ops(dev);
 298         dma_addr_t addr;
 299
 300         kmemcheck_mark_initialized(page_address(page) + offset, size);
 301         BUG_ON(!valid_dma_direction(dir));
 302         addr = ops->map_page(dev, page, offset, size, dir, attrs);
 303         debug_dma_map_page(dev, page, offset, size, dir, addr, false);
 304
 305         return addr;
 306 }
 307
 308 static inline void dma_unmap_page_attrs(struct device *dev,
 309                                         dma_addr_t addr, size_t size,
 310                                         enum dma_data_direction dir,
 311                                         unsigned long attrs)
 312 {
 313         const struct dma_map_ops *ops = get_dma_ops(dev);
 314
 315         BUG_ON(!valid_dma_direction(dir));
 316         if (ops->unmap_page)
 317                 ops->unmap_page(dev, addr, size, dir, attrs);
 318         debug_dma_unmap_page(dev, addr, size, dir, false);
 319 }
 320
 321 static inline dma_addr_t dma_map_resource(struct device *dev,
 322                                           phys_addr_t phys_addr,
 323                                           size_t size,
 324                                           enum dma_data_direction dir,
 325                                           unsigned long attrs)
 326 {
 327         const struct dma_map_ops *ops = get_dma_ops(dev);
 328         dma_addr_t addr;
 329
 330         BUG_ON(!valid_dma_direction(dir));
 331
 332         /* Don't allow RAM to be mapped */
 333         BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
 334
 335         addr = phys_addr;
 336         if (ops->map_resource)
 337                 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
 338
 339         debug_dma_map_resource(dev, phys_addr, size, dir, addr);
 340
 341         return addr;
 342 }
 343
 344 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
 345                                       size_t size, enum dma_data_direction dir,
 346                                       unsigned long attrs)
 347 {
 348         const struct dma_map_ops *ops = get_dma_ops(dev);
 349
 350         BUG_ON(!valid_dma_direction(dir));
 351         if (ops->unmap_resource)
 352                 ops->unmap_resource(dev, addr, size, dir, attrs);
 353         debug_dma_unmap_resource(dev, addr, size, dir);
 354 }
 355
 356 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 357                                            size_t size,
 358                                            enum dma_data_direction dir)
 359 {
 360         const struct dma_map_ops *ops = get_dma_ops(dev);
 361
 362         BUG_ON(!valid_dma_direction(dir));
 363         if (ops->sync_single_for_cpu)
 364                 ops->sync_single_for_cpu(dev, addr, size, dir);
 365         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 366 }
 367
 368 static inline void dma_sync_single_for_device(struct device *dev,
 369                                               dma_addr_t addr, size_t size,
 370                                               enum dma_data_direction dir)
 371 {
 372         const struct dma_map_ops *ops = get_dma_ops(dev);
 373
 374         BUG_ON(!valid_dma_direction(dir));
 375         if (ops->sync_single_for_device)
 376                 ops->sync_single_for_device(dev, addr, size, dir);
 377         debug_dma_sync_single_for_device(dev, addr, size, dir);
 378 }
 379
 380 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 381                                                  dma_addr_t addr,
 382                                                  unsigned long offset,
 383                                                  size_t size,
 384                                                  enum dma_data_direction dir)
 385 {
 386         const struct dma_map_ops *ops = get_dma_ops(dev);
 387
 388         BUG_ON(!valid_dma_direction(dir));
 389         if (ops->sync_single_for_cpu)
 390                 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
 391         debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
 392 }
 393
 394 static inline void dma_sync_single_range_for_device(struct device *dev,
 395                                                     dma_addr_t addr,
 396                                                     unsigned long offset,
 397                                                     size_t size,
 398                                                     enum dma_data_direction dir)
 399 {
 400         const struct dma_map_ops *ops = get_dma_ops(dev);
 401
 402         BUG_ON(!valid_dma_direction(dir));
 403         if (ops->sync_single_for_device)
 404                 ops->sync_single_for_device(dev, addr + offset, size, dir);
 405         debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
 406 }
 407
 408 static inline void
 409 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 410                     int nelems, enum dma_data_direction dir)
 411 {
 412         const struct dma_map_ops *ops = get_dma_ops(dev);
 413
 414         BUG_ON(!valid_dma_direction(dir));
 415         if (ops->sync_sg_for_cpu)
 416                 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
 417         debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 418 }
 419
 420 static inline void
 421 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 422                        int nelems, enum dma_data_direction dir)
 423 {
 424         const struct dma_map_ops *ops = get_dma_ops(dev);
 425
 426         BUG_ON(!valid_dma_direction(dir));
 427         if (ops->sync_sg_for_device)
 428                 ops->sync_sg_for_device(dev, sg, nelems, dir);
 429         debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 430
 431 }
 432
 433 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
 434 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
 435 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
 436 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
 437 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
 438 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
 439
 440 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 441                            void *cpu_addr, dma_addr_t dma_addr, size_t size);
 442
 443 void *dma_common_contiguous_remap(struct page *page, size_t size,
 444                         unsigned long vm_flags,
 445                         pgprot_t prot, const void *caller);
 446
 447 void *dma_common_pages_remap(struct page **pages, size_t size,
 448                         unsigned long vm_flags, pgprot_t prot,
 449                         const void *caller);
 450 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
 451
 452 /**
 453  * dma_mmap_attrs - map a coherent DMA allocation into user space
 454  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 455  * @vma: vm_area_struct describing requested user mapping
 456  * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 457  * @handle: device-view address returned from dma_alloc_attrs
 458  * @size: size of memory originally requested in dma_alloc_attrs
 459  * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 460  *
 461  * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 462  * into user space.  The coherent DMA buffer must not be freed by the
 463  * driver until the user space mapping has been released.
 464  */
 465 static inline int
 466 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
 467                dma_addr_t dma_addr, size_t size, unsigned long attrs)
 468 {
 469         const struct dma_map_ops *ops = get_dma_ops(dev);
 470         BUG_ON(!ops);
 471         if (ops->mmap)
 472                 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
 473         return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
 474 }
 475
 476 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
 477
 478 int
 479 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 480                        void *cpu_addr, dma_addr_t dma_addr, size_t size);
 481
 482 static inline int
 483 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
 484                       dma_addr_t dma_addr, size_t size,
 485                       unsigned long attrs)
 486 {
 487         const struct dma_map_ops *ops = get_dma_ops(dev);
 488         BUG_ON(!ops);
 489         if (ops->get_sgtable)
 490                 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
 491                                         attrs);
 492         return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
 493 }
 494
 495 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
 496
 497 #ifndef arch_dma_alloc_attrs
 498 #define arch_dma_alloc_attrs(dev, flag) (true)
 499 #endif
 500
 501 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 502                                        dma_addr_t *dma_handle, gfp_t flag,
 503                                        unsigned long attrs)
 504 {
 505         const struct dma_map_ops *ops = get_dma_ops(dev);
 506         void *cpu_addr;
 507
 508         BUG_ON(!ops);
 509
 510         if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
 511                 return cpu_addr;
 512
 513         if (!arch_dma_alloc_attrs(&dev, &flag))
 514                 return NULL;
 515         if (!ops->alloc)
 516                 return NULL;
 517
 518         cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
 519         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 520         return cpu_addr;
 521 }
 522
 523 static inline void dma_free_attrs(struct device *dev, size_t size,
 524                                      void *cpu_addr, dma_addr_t dma_handle,
 525                                      unsigned long attrs)
 526 {
 527         const struct dma_map_ops *ops = get_dma_ops(dev);
 528
 529         BUG_ON(!ops);
 530         WARN_ON(irqs_disabled());
 531
 532         if (dma_release_from_dev_coherent(dev, get_order(size), cpu_addr))
 533                 return;
 534
 535         if (!ops->free || !cpu_addr)
 536                 return;
 537
 538         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 539         ops->free(dev, size, cpu_addr, dma_handle, attrs);
 540 }
 541
 542 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 543                 dma_addr_t *dma_handle, gfp_t flag)
 544 {
 545         return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
 546 }
 547
 548 static inline void dma_free_coherent(struct device *dev, size_t size,
 549                 void *cpu_addr, dma_addr_t dma_handle)
 550 {
 551         return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
 552 }
 553
 554 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 555 {
 556         const struct dma_map_ops *ops = get_dma_ops(dev);
 557
 558         debug_dma_mapping_error(dev, dma_addr);
 559         if (ops->mapping_error)
 560                 return ops->mapping_error(dev, dma_addr);
 561         return 0;
 562 }
 563
 564 static inline void dma_check_mask(struct device *dev, u64 mask)
 565 {
 566         if (sme_active() && (mask < (((u64)sme_get_me_mask() << 1) - 1)))
 567                 dev_warn(dev, "SME is active, device will require DMA bounce buffers\n");
 568 }
 569
 570 static inline int dma_supported(struct device *dev, u64 mask)
 571 {
 572         const struct dma_map_ops *ops = get_dma_ops(dev);
 573
 574         if (!ops)
 575                 return 0;
 576         if (!ops->dma_supported)
 577                 return 1;
 578         return ops->dma_supported(dev, mask);
 579 }
 580
 581 #ifndef HAVE_ARCH_DMA_SET_MASK
 582 static inline int dma_set_mask(struct device *dev, u64 mask)
 583 {
 584         if (!dev->dma_mask || !dma_supported(dev, mask))
 585                 return -EIO;
 586
 587         dma_check_mask(dev, mask);
 588
 589         *dev->dma_mask = mask;
 590         return 0;
 591 }
 592 #endif
 593
 594 static inline u64 dma_get_mask(struct device *dev)
 595 {
 596         if (dev && dev->dma_mask && *dev->dma_mask)
 597                 return *dev->dma_mask;
 598         return DMA_BIT_MASK(32);
 599 }
 600
 601 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
 602 int dma_set_coherent_mask(struct device *dev, u64 mask);
 603 #else
 604 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
 605 {
 606         if (!dma_supported(dev, mask))
 607                 return -EIO;
 608
 609         dma_check_mask(dev, mask);
 610
 611         dev->coherent_dma_mask = mask;
 612         return 0;
 613 }
 614 #endif
 615
 616 /*
 617  * Set both the DMA mask and the coherent DMA mask to the same thing.
 618  * Note that we don't check the return value from dma_set_coherent_mask()
 619  * as the DMA API guarantees that the coherent DMA mask can be set to
 620  * the same or smaller than the streaming DMA mask.
 621  */
 622 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 623 {
 624         int rc = dma_set_mask(dev, mask);
 625         if (rc == 0)
 626                 dma_set_coherent_mask(dev, mask);
 627         return rc;
 628 }
 629
 630 /*
 631  * Similar to the above, except it deals with the case where the device
 632  * does not have dev->dma_mask appropriately setup.
 633  */
 634 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 635 {
 636         dev->dma_mask = &dev->coherent_dma_mask;
 637         return dma_set_mask_and_coherent(dev, mask);
 638 }
 639
 640 extern u64 dma_get_required_mask(struct device *dev);
 641
 642 #ifndef arch_setup_dma_ops
 643 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 644                                       u64 size, const struct iommu_ops *iommu,
 645                                       bool coherent) { }
 646 #endif
 647
 648 #ifndef arch_teardown_dma_ops
 649 static inline void arch_teardown_dma_ops(struct device *dev) { }
 650 #endif
 651
 652 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 653 {
 654         if (dev->dma_parms && dev->dma_parms->max_segment_size)
 655                 return dev->dma_parms->max_segment_size;
 656         return SZ_64K;
 657 }
 658
 659 static inline unsigned int dma_set_max_seg_size(struct device *dev,
 660                                                 unsigned int size)
 661 {
 662         if (dev->dma_parms) {
 663                 dev->dma_parms->max_segment_size = size;
 664                 return 0;
 665         }
 666         return -EIO;
 667 }
 668
 669 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 670 {
 671         if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
 672                 return dev->dma_parms->segment_boundary_mask;
 673         return DMA_BIT_MASK(32);
 674 }
 675
 676 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 677 {
 678         if (dev->dma_parms) {
 679                 dev->dma_parms->segment_boundary_mask = mask;
 680                 return 0;
 681         }
 682         return -EIO;
 683 }
 684
 685 #ifndef dma_max_pfn
 686 static inline unsigned long dma_max_pfn(struct device *dev)
 687 {
 688         return *dev->dma_mask >> PAGE_SHIFT;
 689 }
 690 #endif
 691
 692 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 693                                         dma_addr_t *dma_handle, gfp_t flag)
 694 {
 695         void *ret = dma_alloc_coherent(dev, size, dma_handle,
 696                                        flag | __GFP_ZERO);
 697         return ret;
 698 }
 699
 700 #ifdef CONFIG_HAS_DMA
 701 static inline int dma_get_cache_alignment(void)
 702 {
 703 #ifdef ARCH_DMA_MINALIGN
 704         return ARCH_DMA_MINALIGN;
 705 #endif
 706         return 1;
 707 }
 708 #endif
 709
 710 /* flags for the coherent memory api */
 711 #define DMA_MEMORY_EXCLUSIVE            0x01
 712
 713 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 714 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 715                                 dma_addr_t device_addr, size_t size, int flags);
 716 void dma_release_declared_memory(struct device *dev);
 717 void *dma_mark_declared_memory_occupied(struct device *dev,
 718                                         dma_addr_t device_addr, size_t size);
 719 #else
 720 static inline int
 721 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 722                             dma_addr_t device_addr, size_t size, int flags)
 723 {
 724         return -ENOSYS;
 725 }
 726
 727 static inline void
 728 dma_release_declared_memory(struct device *dev)
 729 {
 730 }
 731
 732 static inline void *
 733 dma_mark_declared_memory_occupied(struct device *dev,
 734                                   dma_addr_t device_addr, size_t size)
 735 {
 736         return ERR_PTR(-EBUSY);
 737 }
 738 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 739
 740 #ifdef CONFIG_HAS_DMA
 741 int dma_configure(struct device *dev);
 742 void dma_deconfigure(struct device *dev);
 743 #else
 744 static inline int dma_configure(struct device *dev)
 745 {
 746         return 0;
 747 }
 748
 749 static inline void dma_deconfigure(struct device *dev) {}
 750 #endif
 751
 752 /*
 753  * Managed DMA API
 754  */
 755 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 756                                  dma_addr_t *dma_handle, gfp_t gfp);
 757 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 758                                dma_addr_t dma_handle);
 759 extern void *dmam_alloc_attrs(struct device *dev, size_t size,
 760                               dma_addr_t *dma_handle, gfp_t gfp,
 761                               unsigned long attrs);
 762 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 763 extern int dmam_declare_coherent_memory(struct device *dev,
 764                                         phys_addr_t phys_addr,
 765                                         dma_addr_t device_addr, size_t size,
 766                                         int flags);
 767 extern void dmam_release_declared_memory(struct device *dev);
 768 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 769 static inline int dmam_declare_coherent_memory(struct device *dev,
 770                                 phys_addr_t phys_addr, dma_addr_t device_addr,
 771                                 size_t size, gfp_t gfp)
 772 {
 773         return 0;
 774 }
 775
 776 static inline void dmam_release_declared_memory(struct device *dev)
 777 {
 778 }
 779 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 780
 781 static inline void *dma_alloc_wc(struct device *dev, size_t size,
 782                                  dma_addr_t *dma_addr, gfp_t gfp)
 783 {
 784         return dma_alloc_attrs(dev, size, dma_addr, gfp,
 785                                DMA_ATTR_WRITE_COMBINE);
 786 }
 787 #ifndef dma_alloc_writecombine
 788 #define dma_alloc_writecombine dma_alloc_wc
 789 #endif
 790
 791 static inline void dma_free_wc(struct device *dev, size_t size,
 792                                void *cpu_addr, dma_addr_t dma_addr)
 793 {
 794         return dma_free_attrs(dev, size, cpu_addr, dma_addr,
 795                               DMA_ATTR_WRITE_COMBINE);
 796 }
 797 #ifndef dma_free_writecombine
 798 #define dma_free_writecombine dma_free_wc
 799 #endif
 800
 801 static inline int dma_mmap_wc(struct device *dev,
 802                               struct vm_area_struct *vma,
 803                               void *cpu_addr, dma_addr_t dma_addr,
 804                               size_t size)
 805 {
 806         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
 807                               DMA_ATTR_WRITE_COMBINE);
 808 }
 809 #ifndef dma_mmap_writecombine
 810 #define dma_mmap_writecombine dma_mmap_wc
 811 #endif
 812
 813 #if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
 814 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 815 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 816 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 817 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 818 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 819 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 820 #else
 821 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 822 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 823 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 824 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 825 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 826 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 827 #endif
 828
 829 #endif