root/include/linux/dma-mapping.h

INCLUDED FROM

DEFINITIONS

1. valid_dma_direction
2. dma_alloc_from_global_coherent
3. dma_release_from_global_coherent
4. dma_mmap_from_global_coherent
5. dma_is_direct
6. dma_direct_sync_single_for_device
7. dma_direct_sync_sg_for_device
8. dma_direct_unmap_page
9. dma_direct_unmap_sg
10. dma_direct_sync_single_for_cpu
11. dma_direct_sync_sg_for_cpu
12. get_dma_ops
13. set_dma_ops
14. dma_map_page_attrs
15. dma_unmap_page_attrs
16. dma_map_sg_attrs
17. dma_unmap_sg_attrs
18. dma_map_resource
19. dma_unmap_resource
20. dma_sync_single_for_cpu
21. dma_sync_single_for_device
22. dma_sync_sg_for_cpu
23. dma_sync_sg_for_device
24. dma_mapping_error
25. dma_map_page_attrs
26. dma_unmap_page_attrs
27. dma_map_sg_attrs
28. dma_unmap_sg_attrs
29. dma_map_resource
30. dma_unmap_resource
31. dma_sync_single_for_cpu
32. dma_sync_single_for_device
33. dma_sync_sg_for_cpu
34. dma_sync_sg_for_device
35. dma_mapping_error
36. dma_alloc_attrs
37. dma_free_attrs
38. dmam_alloc_attrs
39. dmam_free_coherent
40. dma_cache_sync
41. dma_get_sgtable_attrs
42. dma_mmap_attrs
43. dma_can_mmap
44. dma_supported
45. dma_set_mask
46. dma_set_coherent_mask
47. dma_get_required_mask
48. dma_max_mapping_size
49. dma_get_merge_boundary
50. dma_map_single_attrs
51. dma_unmap_single_attrs
52. dma_sync_single_range_for_cpu
53. dma_sync_single_range_for_device
54. dma_alloc_coherent
55. dma_free_coherent
56. dma_get_mask
57. dma_set_mask_and_coherent
58. dma_coerce_mask_and_coherent
59. dma_addressing_limited
60. arch_setup_dma_ops
61. arch_teardown_dma_ops
62. dma_get_max_seg_size
63. dma_set_max_seg_size
64. dma_get_seg_boundary
65. dma_set_seg_boundary
66. dma_get_cache_alignment
67. dma_declare_coherent_memory
68. dmam_alloc_coherent
69. dma_alloc_wc
70. dma_free_wc
71. dma_mmap_wc

   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 (*dma_supported)(struct device *dev, u64 mask);
 132         u64 (*get_required_mask)(struct device *dev);
 133         size_t (*max_mapping_size)(struct device *dev);
 134         unsigned long (*get_merge_boundary)(struct device *dev);
 135 };
 136 
 137 #define DMA_MAPPING_ERROR               (~(dma_addr_t)0)
 138 
 139 extern const struct dma_map_ops dma_virt_ops;
 140 extern const struct dma_map_ops dma_dummy_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 #ifdef CONFIG_DMA_DECLARE_COHERENT
 154 /*
 155  * These three functions are only for dma allocator.
 156  * Don't use them in device drivers.
 157  */
 158 int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
 159                                        dma_addr_t *dma_handle, void **ret);
 160 int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
 161 
 162 int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
 163                             void *cpu_addr, size_t size, int *ret);
 164 
 165 void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size, dma_addr_t *dma_handle);
 166 int dma_release_from_global_coherent(int order, void *vaddr);
 167 int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
 168                                   size_t size, int *ret);
 169 
 170 #else
 171 #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
 172 #define dma_release_from_dev_coherent(dev, order, vaddr) (0)
 173 #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
 174 
 175 static inline void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size,
 176                                                    dma_addr_t *dma_handle)
 177 {
 178         return NULL;
 179 }
 180 
 181 static inline int dma_release_from_global_coherent(int order, void *vaddr)
 182 {
 183         return 0;
 184 }
 185 
 186 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
 187                                                 void *cpu_addr, size_t size,
 188                                                 int *ret)
 189 {
 190         return 0;
 191 }
 192 #endif /* CONFIG_DMA_DECLARE_COHERENT */
 193 
 194 static inline bool dma_is_direct(const struct dma_map_ops *ops)
 195 {
 196         return likely(!ops);
 197 }
 198 
 199 /*
 200  * All the dma_direct_* declarations are here just for the indirect call bypass,
 201  * and must not be used directly drivers!
 202  */
 203 dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
 204                 unsigned long offset, size_t size, enum dma_data_direction dir,
 205                 unsigned long attrs);
 206 int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
 207                 enum dma_data_direction dir, unsigned long attrs);
 208 dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
 209                 size_t size, enum dma_data_direction dir, unsigned long attrs);
 210 
 211 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
 212     defined(CONFIG_SWIOTLB)
 213 void dma_direct_sync_single_for_device(struct device *dev,
 214                 dma_addr_t addr, size_t size, enum dma_data_direction dir);
 215 void dma_direct_sync_sg_for_device(struct device *dev,
 216                 struct scatterlist *sgl, int nents, enum dma_data_direction dir);
 217 #else
 218 static inline void dma_direct_sync_single_for_device(struct device *dev,
 219                 dma_addr_t addr, size_t size, enum dma_data_direction dir)
 220 {
 221 }
 222 static inline void dma_direct_sync_sg_for_device(struct device *dev,
 223                 struct scatterlist *sgl, int nents, enum dma_data_direction dir)
 224 {
 225 }
 226 #endif
 227 
 228 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
 229     defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \
 230     defined(CONFIG_SWIOTLB)
 231 void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
 232                 size_t size, enum dma_data_direction dir, unsigned long attrs);
 233 void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl,
 234                 int nents, enum dma_data_direction dir, unsigned long attrs);
 235 void dma_direct_sync_single_for_cpu(struct device *dev,
 236                 dma_addr_t addr, size_t size, enum dma_data_direction dir);
 237 void dma_direct_sync_sg_for_cpu(struct device *dev,
 238                 struct scatterlist *sgl, int nents, enum dma_data_direction dir);
 239 #else
 240 static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
 241                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 242 {
 243 }
 244 static inline void dma_direct_unmap_sg(struct device *dev,
 245                 struct scatterlist *sgl, int nents, enum dma_data_direction dir,
 246                 unsigned long attrs)
 247 {
 248 }
 249 static inline void dma_direct_sync_single_for_cpu(struct device *dev,
 250                 dma_addr_t addr, size_t size, enum dma_data_direction dir)
 251 {
 252 }
 253 static inline void dma_direct_sync_sg_for_cpu(struct device *dev,
 254                 struct scatterlist *sgl, int nents, enum dma_data_direction dir)
 255 {
 256 }
 257 #endif
 258 
 259 size_t dma_direct_max_mapping_size(struct device *dev);
 260 
 261 #ifdef CONFIG_HAS_DMA
 262 #include <asm/dma-mapping.h>
 263 
 264 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 265 {
 266         if (dev->dma_ops)
 267                 return dev->dma_ops;
 268         return get_arch_dma_ops(dev->bus);
 269 }
 270 
 271 static inline void set_dma_ops(struct device *dev,
 272                                const struct dma_map_ops *dma_ops)
 273 {
 274         dev->dma_ops = dma_ops;
 275 }
 276 
 277 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 278                 struct page *page, size_t offset, size_t size,
 279                 enum dma_data_direction dir, unsigned long attrs)
 280 {
 281         const struct dma_map_ops *ops = get_dma_ops(dev);
 282         dma_addr_t addr;
 283 
 284         BUG_ON(!valid_dma_direction(dir));
 285         if (dma_is_direct(ops))
 286                 addr = dma_direct_map_page(dev, page, offset, size, dir, attrs);
 287         else
 288                 addr = ops->map_page(dev, page, offset, size, dir, attrs);
 289         debug_dma_map_page(dev, page, offset, size, dir, addr);
 290 
 291         return addr;
 292 }
 293 
 294 static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr,
 295                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 296 {
 297         const struct dma_map_ops *ops = get_dma_ops(dev);
 298 
 299         BUG_ON(!valid_dma_direction(dir));
 300         if (dma_is_direct(ops))
 301                 dma_direct_unmap_page(dev, addr, size, dir, attrs);
 302         else if (ops->unmap_page)
 303                 ops->unmap_page(dev, addr, size, dir, attrs);
 304         debug_dma_unmap_page(dev, addr, size, dir);
 305 }
 306 
 307 /*
 308  * dma_maps_sg_attrs returns 0 on error and > 0 on success.
 309  * It should never return a value < 0.
 310  */
 311 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 312                                    int nents, enum dma_data_direction dir,
 313                                    unsigned long attrs)
 314 {
 315         const struct dma_map_ops *ops = get_dma_ops(dev);
 316         int ents;
 317 
 318         BUG_ON(!valid_dma_direction(dir));
 319         if (dma_is_direct(ops))
 320                 ents = dma_direct_map_sg(dev, sg, nents, dir, attrs);
 321         else
 322                 ents = ops->map_sg(dev, sg, nents, dir, attrs);
 323         BUG_ON(ents < 0);
 324         debug_dma_map_sg(dev, sg, nents, ents, dir);
 325 
 326         return ents;
 327 }
 328 
 329 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 330                                       int nents, enum dma_data_direction dir,
 331                                       unsigned long attrs)
 332 {
 333         const struct dma_map_ops *ops = get_dma_ops(dev);
 334 
 335         BUG_ON(!valid_dma_direction(dir));
 336         debug_dma_unmap_sg(dev, sg, nents, dir);
 337         if (dma_is_direct(ops))
 338                 dma_direct_unmap_sg(dev, sg, nents, dir, attrs);
 339         else if (ops->unmap_sg)
 340                 ops->unmap_sg(dev, sg, nents, dir, attrs);
 341 }
 342 
 343 static inline dma_addr_t dma_map_resource(struct device *dev,
 344                                           phys_addr_t phys_addr,
 345                                           size_t size,
 346                                           enum dma_data_direction dir,
 347                                           unsigned long attrs)
 348 {
 349         const struct dma_map_ops *ops = get_dma_ops(dev);
 350         dma_addr_t addr = DMA_MAPPING_ERROR;
 351 
 352         BUG_ON(!valid_dma_direction(dir));
 353 
 354         /* Don't allow RAM to be mapped */
 355         if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
 356                 return DMA_MAPPING_ERROR;
 357 
 358         if (dma_is_direct(ops))
 359                 addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs);
 360         else if (ops->map_resource)
 361                 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
 362 
 363         debug_dma_map_resource(dev, phys_addr, size, dir, addr);
 364         return addr;
 365 }
 366 
 367 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
 368                                       size_t size, enum dma_data_direction dir,
 369                                       unsigned long attrs)
 370 {
 371         const struct dma_map_ops *ops = get_dma_ops(dev);
 372 
 373         BUG_ON(!valid_dma_direction(dir));
 374         if (!dma_is_direct(ops) && ops->unmap_resource)
 375                 ops->unmap_resource(dev, addr, size, dir, attrs);
 376         debug_dma_unmap_resource(dev, addr, size, dir);
 377 }
 378 
 379 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 380                                            size_t size,
 381                                            enum dma_data_direction dir)
 382 {
 383         const struct dma_map_ops *ops = get_dma_ops(dev);
 384 
 385         BUG_ON(!valid_dma_direction(dir));
 386         if (dma_is_direct(ops))
 387                 dma_direct_sync_single_for_cpu(dev, addr, size, dir);
 388         else if (ops->sync_single_for_cpu)
 389                 ops->sync_single_for_cpu(dev, addr, size, dir);
 390         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 391 }
 392 
 393 static inline void dma_sync_single_for_device(struct device *dev,
 394                                               dma_addr_t addr, size_t size,
 395                                               enum dma_data_direction dir)
 396 {
 397         const struct dma_map_ops *ops = get_dma_ops(dev);
 398 
 399         BUG_ON(!valid_dma_direction(dir));
 400         if (dma_is_direct(ops))
 401                 dma_direct_sync_single_for_device(dev, addr, size, dir);
 402         else if (ops->sync_single_for_device)
 403                 ops->sync_single_for_device(dev, addr, size, dir);
 404         debug_dma_sync_single_for_device(dev, addr, size, dir);
 405 }
 406 
 407 static inline void
 408 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 409                     int nelems, enum dma_data_direction dir)
 410 {
 411         const struct dma_map_ops *ops = get_dma_ops(dev);
 412 
 413         BUG_ON(!valid_dma_direction(dir));
 414         if (dma_is_direct(ops))
 415                 dma_direct_sync_sg_for_cpu(dev, sg, nelems, dir);
 416         else if (ops->sync_sg_for_cpu)
 417                 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
 418         debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 419 }
 420 
 421 static inline void
 422 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 423                        int nelems, enum dma_data_direction dir)
 424 {
 425         const struct dma_map_ops *ops = get_dma_ops(dev);
 426 
 427         BUG_ON(!valid_dma_direction(dir));
 428         if (dma_is_direct(ops))
 429                 dma_direct_sync_sg_for_device(dev, sg, nelems, dir);
 430         else if (ops->sync_sg_for_device)
 431                 ops->sync_sg_for_device(dev, sg, nelems, dir);
 432         debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 433 
 434 }
 435 
 436 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 437 {
 438         debug_dma_mapping_error(dev, dma_addr);
 439 
 440         if (dma_addr == DMA_MAPPING_ERROR)
 441                 return -ENOMEM;
 442         return 0;
 443 }
 444 
 445 void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
 446                 gfp_t flag, unsigned long attrs);
 447 void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
 448                 dma_addr_t dma_handle, unsigned long attrs);
 449 void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
 450                 gfp_t gfp, unsigned long attrs);
 451 void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 452                 dma_addr_t dma_handle);
 453 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 454                 enum dma_data_direction dir);
 455 int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt,
 456                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 457                 unsigned long attrs);
 458 int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
 459                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 460                 unsigned long attrs);
 461 bool dma_can_mmap(struct device *dev);
 462 int dma_supported(struct device *dev, u64 mask);
 463 int dma_set_mask(struct device *dev, u64 mask);
 464 int dma_set_coherent_mask(struct device *dev, u64 mask);
 465 u64 dma_get_required_mask(struct device *dev);
 466 size_t dma_max_mapping_size(struct device *dev);
 467 unsigned long dma_get_merge_boundary(struct device *dev);
 468 #else /* CONFIG_HAS_DMA */
 469 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 470                 struct page *page, size_t offset, size_t size,
 471                 enum dma_data_direction dir, unsigned long attrs)
 472 {
 473         return DMA_MAPPING_ERROR;
 474 }
 475 static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr,
 476                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 477 {
 478 }
 479 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 480                 int nents, enum dma_data_direction dir, unsigned long attrs)
 481 {
 482         return 0;
 483 }
 484 static inline void dma_unmap_sg_attrs(struct device *dev,
 485                 struct scatterlist *sg, int nents, enum dma_data_direction dir,
 486                 unsigned long attrs)
 487 {
 488 }
 489 static inline dma_addr_t dma_map_resource(struct device *dev,
 490                 phys_addr_t phys_addr, size_t size, enum dma_data_direction dir,
 491                 unsigned long attrs)
 492 {
 493         return DMA_MAPPING_ERROR;
 494 }
 495 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
 496                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 497 {
 498 }
 499 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 500                 size_t size, enum dma_data_direction dir)
 501 {
 502 }
 503 static inline void dma_sync_single_for_device(struct device *dev,
 504                 dma_addr_t addr, size_t size, enum dma_data_direction dir)
 505 {
 506 }
 507 static inline void dma_sync_sg_for_cpu(struct device *dev,
 508                 struct scatterlist *sg, int nelems, enum dma_data_direction dir)
 509 {
 510 }
 511 static inline void dma_sync_sg_for_device(struct device *dev,
 512                 struct scatterlist *sg, int nelems, enum dma_data_direction dir)
 513 {
 514 }
 515 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 516 {
 517         return -ENOMEM;
 518 }
 519 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 520                 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
 521 {
 522         return NULL;
 523 }
 524 static void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
 525                 dma_addr_t dma_handle, unsigned long attrs)
 526 {
 527 }
 528 static inline void *dmam_alloc_attrs(struct device *dev, size_t size,
 529                 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 530 {
 531         return NULL;
 532 }
 533 static inline void dmam_free_coherent(struct device *dev, size_t size,
 534                 void *vaddr, dma_addr_t dma_handle)
 535 {
 536 }
 537 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 538                 enum dma_data_direction dir)
 539 {
 540 }
 541 static inline int dma_get_sgtable_attrs(struct device *dev,
 542                 struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr,
 543                 size_t size, unsigned long attrs)
 544 {
 545         return -ENXIO;
 546 }
 547 static inline int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
 548                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 549                 unsigned long attrs)
 550 {
 551         return -ENXIO;
 552 }
 553 static inline bool dma_can_mmap(struct device *dev)
 554 {
 555         return false;
 556 }
 557 static inline int dma_supported(struct device *dev, u64 mask)
 558 {
 559         return 0;
 560 }
 561 static inline int dma_set_mask(struct device *dev, u64 mask)
 562 {
 563         return -EIO;
 564 }
 565 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
 566 {
 567         return -EIO;
 568 }
 569 static inline u64 dma_get_required_mask(struct device *dev)
 570 {
 571         return 0;
 572 }
 573 static inline size_t dma_max_mapping_size(struct device *dev)
 574 {
 575         return 0;
 576 }
 577 static inline unsigned long dma_get_merge_boundary(struct device *dev)
 578 {
 579         return 0;
 580 }
 581 #endif /* CONFIG_HAS_DMA */
 582 
 583 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
 584                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 585 {
 586         /* DMA must never operate on areas that might be remapped. */
 587         if (dev_WARN_ONCE(dev, is_vmalloc_addr(ptr),
 588                           "rejecting DMA map of vmalloc memory\n"))
 589                 return DMA_MAPPING_ERROR;
 590         debug_dma_map_single(dev, ptr, size);
 591         return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr),
 592                         size, dir, attrs);
 593 }
 594 
 595 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
 596                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 597 {
 598         return dma_unmap_page_attrs(dev, addr, size, dir, attrs);
 599 }
 600 
 601 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 602                 dma_addr_t addr, unsigned long offset, size_t size,
 603                 enum dma_data_direction dir)
 604 {
 605         return dma_sync_single_for_cpu(dev, addr + offset, size, dir);
 606 }
 607 
 608 static inline void dma_sync_single_range_for_device(struct device *dev,
 609                 dma_addr_t addr, unsigned long offset, size_t size,
 610                 enum dma_data_direction dir)
 611 {
 612         return dma_sync_single_for_device(dev, addr + offset, size, dir);
 613 }
 614 
 615 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
 616 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
 617 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
 618 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
 619 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
 620 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
 621 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
 622 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
 623 
 624 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 625                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 626                 unsigned long attrs);
 627 
 628 struct page **dma_common_find_pages(void *cpu_addr);
 629 void *dma_common_contiguous_remap(struct page *page, size_t size,
 630                         pgprot_t prot, const void *caller);
 631 
 632 void *dma_common_pages_remap(struct page **pages, size_t size,
 633                         pgprot_t prot, const void *caller);
 634 void dma_common_free_remap(void *cpu_addr, size_t size);
 635 
 636 bool dma_in_atomic_pool(void *start, size_t size);
 637 void *dma_alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags);
 638 bool dma_free_from_pool(void *start, size_t size);
 639 
 640 int
 641 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr,
 642                 dma_addr_t dma_addr, size_t size, unsigned long attrs);
 643 
 644 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 645                 dma_addr_t *dma_handle, gfp_t gfp)
 646 {
 647 
 648         return dma_alloc_attrs(dev, size, dma_handle, gfp,
 649                         (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0);
 650 }
 651 
 652 static inline void dma_free_coherent(struct device *dev, size_t size,
 653                 void *cpu_addr, dma_addr_t dma_handle)
 654 {
 655         return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
 656 }
 657 
 658 
 659 static inline u64 dma_get_mask(struct device *dev)
 660 {
 661         if (dev->dma_mask && *dev->dma_mask)
 662                 return *dev->dma_mask;
 663         return DMA_BIT_MASK(32);
 664 }
 665 
 666 /*
 667  * Set both the DMA mask and the coherent DMA mask to the same thing.
 668  * Note that we don't check the return value from dma_set_coherent_mask()
 669  * as the DMA API guarantees that the coherent DMA mask can be set to
 670  * the same or smaller than the streaming DMA mask.
 671  */
 672 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 673 {
 674         int rc = dma_set_mask(dev, mask);
 675         if (rc == 0)
 676                 dma_set_coherent_mask(dev, mask);
 677         return rc;
 678 }
 679 
 680 /*
 681  * Similar to the above, except it deals with the case where the device
 682  * does not have dev->dma_mask appropriately setup.
 683  */
 684 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 685 {
 686         dev->dma_mask = &dev->coherent_dma_mask;
 687         return dma_set_mask_and_coherent(dev, mask);
 688 }
 689 
 690 /**
 691  * dma_addressing_limited - return if the device is addressing limited
 692  * @dev:        device to check
 693  *
 694  * Return %true if the devices DMA mask is too small to address all memory in
 695  * the system, else %false.  Lack of addressing bits is the prime reason for
 696  * bounce buffering, but might not be the only one.
 697  */
 698 static inline bool dma_addressing_limited(struct device *dev)
 699 {
 700         return min_not_zero(dma_get_mask(dev), dev->bus_dma_mask) <
 701                             dma_get_required_mask(dev);
 702 }
 703 
 704 #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
 705 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 706                 const struct iommu_ops *iommu, bool coherent);
 707 #else
 708 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 709                 u64 size, const struct iommu_ops *iommu, bool coherent)
 710 {
 711 }
 712 #endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */
 713 
 714 #ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS
 715 void arch_teardown_dma_ops(struct device *dev);
 716 #else
 717 static inline void arch_teardown_dma_ops(struct device *dev)
 718 {
 719 }
 720 #endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */
 721 
 722 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 723 {
 724         if (dev->dma_parms && dev->dma_parms->max_segment_size)
 725                 return dev->dma_parms->max_segment_size;
 726         return SZ_64K;
 727 }
 728 
 729 static inline int dma_set_max_seg_size(struct device *dev, unsigned int size)
 730 {
 731         if (dev->dma_parms) {
 732                 dev->dma_parms->max_segment_size = size;
 733                 return 0;
 734         }
 735         return -EIO;
 736 }
 737 
 738 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 739 {
 740         if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
 741                 return dev->dma_parms->segment_boundary_mask;
 742         return DMA_BIT_MASK(32);
 743 }
 744 
 745 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 746 {
 747         if (dev->dma_parms) {
 748                 dev->dma_parms->segment_boundary_mask = mask;
 749                 return 0;
 750         }
 751         return -EIO;
 752 }
 753 
 754 static inline int dma_get_cache_alignment(void)
 755 {
 756 #ifdef ARCH_DMA_MINALIGN
 757         return ARCH_DMA_MINALIGN;
 758 #endif
 759         return 1;
 760 }
 761 
 762 #ifdef CONFIG_DMA_DECLARE_COHERENT
 763 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 764                                 dma_addr_t device_addr, size_t size);
 765 #else
 766 static inline int
 767 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 768                             dma_addr_t device_addr, size_t size)
 769 {
 770         return -ENOSYS;
 771 }
 772 #endif /* CONFIG_DMA_DECLARE_COHERENT */
 773 
 774 static inline void *dmam_alloc_coherent(struct device *dev, size_t size,
 775                 dma_addr_t *dma_handle, gfp_t gfp)
 776 {
 777         return dmam_alloc_attrs(dev, size, dma_handle, gfp,
 778                         (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0);
 779 }
 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         unsigned long attrs = DMA_ATTR_WRITE_COMBINE;
 785 
 786         if (gfp & __GFP_NOWARN)
 787                 attrs |= DMA_ATTR_NO_WARN;
 788 
 789         return dma_alloc_attrs(dev, size, dma_addr, gfp, attrs);
 790 }
 791 
 792 static inline void dma_free_wc(struct device *dev, size_t size,
 793                                void *cpu_addr, dma_addr_t dma_addr)
 794 {
 795         return dma_free_attrs(dev, size, cpu_addr, dma_addr,
 796                               DMA_ATTR_WRITE_COMBINE);
 797 }
 798 
 799 static inline int dma_mmap_wc(struct device *dev,
 800                               struct vm_area_struct *vma,
 801                               void *cpu_addr, dma_addr_t dma_addr,
 802                               size_t size)
 803 {
 804         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
 805                               DMA_ATTR_WRITE_COMBINE);
 806 }
 807 
 808 #ifdef CONFIG_NEED_DMA_MAP_STATE
 809 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 810 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 811 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 812 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 813 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 814 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 815 #else
 816 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 817 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 818 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 819 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 820 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 821 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 822 #endif
 823 
 824 #endif