include/linux/dma-map-ops.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * This header is for implementations of dma_map_ops and related code.
   4  * It should not be included in drivers just using the DMA API.
   5  */
   6 #ifndef _LINUX_DMA_MAP_OPS_H
   7 #define _LINUX_DMA_MAP_OPS_H
   8
   9 #include <linux/dma-mapping.h>
  10 #include <linux/pgtable.h>
  11 #include <linux/slab.h>
  12
  13 struct cma;
  14 struct iommu_ops;
  15
  16 struct dma_map_ops {
  17         void *(*alloc)(struct device *dev, size_t size,
  18                         dma_addr_t *dma_handle, gfp_t gfp,
  19                         unsigned long attrs);
  20         void (*free)(struct device *dev, size_t size, void *vaddr,
  21                         dma_addr_t dma_handle, unsigned long attrs);
  22         struct page *(*alloc_pages_op)(struct device *dev, size_t size,
  23                         dma_addr_t *dma_handle, enum dma_data_direction dir,
  24                         gfp_t gfp);
  25         void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
  26                         dma_addr_t dma_handle, enum dma_data_direction dir);
  27         int (*mmap)(struct device *, struct vm_area_struct *,
  28                         void *, dma_addr_t, size_t, unsigned long attrs);
  29
  30         int (*get_sgtable)(struct device *dev, struct sg_table *sgt,
  31                         void *cpu_addr, dma_addr_t dma_addr, size_t size,
  32                         unsigned long attrs);
  33
  34         dma_addr_t (*map_page)(struct device *dev, struct page *page,
  35                         unsigned long offset, size_t size,
  36                         enum dma_data_direction dir, unsigned long attrs);
  37         void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
  38                         size_t size, enum dma_data_direction dir,
  39                         unsigned long attrs);
  40         /*
  41          * map_sg should return a negative error code on error. See
  42          * dma_map_sgtable() for a list of appropriate error codes
  43          * and their meanings.
  44          */
  45         int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents,
  46                         enum dma_data_direction dir, unsigned long attrs);
  47         void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents,
  48                         enum dma_data_direction dir, unsigned long attrs);
  49         dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
  50                         size_t size, enum dma_data_direction dir,
  51                         unsigned long attrs);
  52         void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
  53                         size_t size, enum dma_data_direction dir,
  54                         unsigned long attrs);
  55         void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle,
  56                         size_t size, enum dma_data_direction dir);
  57         void (*sync_single_for_device)(struct device *dev,
  58                         dma_addr_t dma_handle, size_t size,
  59                         enum dma_data_direction dir);
  60         void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg,
  61                         int nents, enum dma_data_direction dir);
  62         void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg,
  63                         int nents, enum dma_data_direction dir);
  64         void (*cache_sync)(struct device *dev, void *vaddr, size_t size,
  65                         enum dma_data_direction direction);
  66         int (*dma_supported)(struct device *dev, u64 mask);
  67         u64 (*get_required_mask)(struct device *dev);
  68         size_t (*max_mapping_size)(struct device *dev);
  69         size_t (*opt_mapping_size)(void);
  70         unsigned long (*get_merge_boundary)(struct device *dev);
  71 };
  72
  73 #ifdef CONFIG_ARCH_HAS_DMA_OPS
  74 #include <asm/dma-mapping.h>
  75
  76 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
  77 {
  78         if (dev->dma_ops)
  79                 return dev->dma_ops;
  80         return get_arch_dma_ops();
  81 }
  82
  83 static inline void set_dma_ops(struct device *dev,
  84                                const struct dma_map_ops *dma_ops)
  85 {
  86         dev->dma_ops = dma_ops;
  87 }
  88 #else /* CONFIG_ARCH_HAS_DMA_OPS */
  89 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
  90 {
  91         return NULL;
  92 }
  93 static inline void set_dma_ops(struct device *dev,
  94                                const struct dma_map_ops *dma_ops)
  95 {
  96 }
  97 #endif /* CONFIG_ARCH_HAS_DMA_OPS */
  98
  99 #ifdef CONFIG_DMA_CMA
 100 extern struct cma *dma_contiguous_default_area;
 101
 102 static inline struct cma *dev_get_cma_area(struct device *dev)
 103 {
 104         if (dev && dev->cma_area)
 105                 return dev->cma_area;
 106         return dma_contiguous_default_area;
 107 }
 108
 109 void dma_contiguous_reserve(phys_addr_t addr_limit);
 110 int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
 111                 phys_addr_t limit, struct cma **res_cma, bool fixed);
 112
 113 struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
 114                                        unsigned int order, bool no_warn);
 115 bool dma_release_from_contiguous(struct device *dev, struct page *pages,
 116                                  int count);
 117 struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp);
 118 void dma_free_contiguous(struct device *dev, struct page *page, size_t size);
 119
 120 void dma_contiguous_early_fixup(phys_addr_t base, unsigned long size);
 121 #else /* CONFIG_DMA_CMA */
 122 static inline struct cma *dev_get_cma_area(struct device *dev)
 123 {
 124         return NULL;
 125 }
 126 static inline void dma_contiguous_reserve(phys_addr_t limit)
 127 {
 128 }
 129 static inline int dma_contiguous_reserve_area(phys_addr_t size,
 130                 phys_addr_t base, phys_addr_t limit, struct cma **res_cma,
 131                 bool fixed)
 132 {
 133         return -ENOSYS;
 134 }
 135 static inline struct page *dma_alloc_from_contiguous(struct device *dev,
 136                 size_t count, unsigned int order, bool no_warn)
 137 {
 138         return NULL;
 139 }
 140 static inline bool dma_release_from_contiguous(struct device *dev,
 141                 struct page *pages, int count)
 142 {
 143         return false;
 144 }
 145 /* Use fallback alloc() and free() when CONFIG_DMA_CMA=n */
 146 static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size,
 147                 gfp_t gfp)
 148 {
 149         return NULL;
 150 }
 151 static inline void dma_free_contiguous(struct device *dev, struct page *page,
 152                 size_t size)
 153 {
 154         __free_pages(page, get_order(size));
 155 }
 156 #endif /* CONFIG_DMA_CMA*/
 157
 158 #ifdef CONFIG_DMA_DECLARE_COHERENT
 159 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 160                 dma_addr_t device_addr, size_t size);
 161 void dma_release_coherent_memory(struct device *dev);
 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 int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
 166                 void *cpu_addr, size_t size, int *ret);
 167 #else
 168 static inline int dma_declare_coherent_memory(struct device *dev,
 169                 phys_addr_t phys_addr, dma_addr_t device_addr, size_t size)
 170 {
 171         return -ENOSYS;
 172 }
 173
 174 #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
 175 #define dma_release_from_dev_coherent(dev, order, vaddr) (0)
 176 #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
 177 static inline void dma_release_coherent_memory(struct device *dev) { }
 178 #endif /* CONFIG_DMA_DECLARE_COHERENT */
 179
 180 #ifdef CONFIG_DMA_GLOBAL_POOL
 181 void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size,
 182                 dma_addr_t *dma_handle);
 183 int dma_release_from_global_coherent(int order, void *vaddr);
 184 int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
 185                 size_t size, int *ret);
 186 int dma_init_global_coherent(phys_addr_t phys_addr, size_t size);
 187 #else
 188 static inline void *dma_alloc_from_global_coherent(struct device *dev,
 189                 ssize_t size, dma_addr_t *dma_handle)
 190 {
 191         return NULL;
 192 }
 193 static inline int dma_release_from_global_coherent(int order, void *vaddr)
 194 {
 195         return 0;
 196 }
 197 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
 198                 void *cpu_addr, size_t size, int *ret)
 199 {
 200         return 0;
 201 }
 202 #endif /* CONFIG_DMA_GLOBAL_POOL */
 203
 204 int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 205                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 206                 unsigned long attrs);
 207 int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 208                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 209                 unsigned long attrs);
 210 struct page *dma_common_alloc_pages(struct device *dev, size_t size,
 211                 dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
 212 void dma_common_free_pages(struct device *dev, size_t size, struct page *vaddr,
 213                 dma_addr_t dma_handle, enum dma_data_direction dir);
 214
 215 struct page **dma_common_find_pages(void *cpu_addr);
 216 void *dma_common_contiguous_remap(struct page *page, size_t size, pgprot_t prot,
 217                 const void *caller);
 218 void *dma_common_pages_remap(struct page **pages, size_t size, pgprot_t prot,
 219                 const void *caller);
 220 void dma_common_free_remap(void *cpu_addr, size_t size);
 221
 222 struct page *dma_alloc_from_pool(struct device *dev, size_t size,
 223                 void **cpu_addr, gfp_t flags,
 224                 bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t));
 225 bool dma_free_from_pool(struct device *dev, void *start, size_t size);
 226
 227 int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start,
 228                 dma_addr_t dma_start, u64 size);
 229
 230 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
 231         defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
 232         defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
 233 extern bool dma_default_coherent;
 234 static inline bool dev_is_dma_coherent(struct device *dev)
 235 {
 236         return dev->dma_coherent;
 237 }
 238 #else
 239 #define dma_default_coherent true
 240
 241 static inline bool dev_is_dma_coherent(struct device *dev)
 242 {
 243         return true;
 244 }
 245 #endif
 246
 247 static inline void dma_reset_need_sync(struct device *dev)
 248 {
 249 #ifdef CONFIG_DMA_NEED_SYNC
 250         /* Reset it only once so that the function can be called on hotpath */
 251         if (unlikely(dev->dma_skip_sync))
 252                 dev->dma_skip_sync = false;
 253 #endif
 254 }
 255
 256 /*
 257  * Check whether potential kmalloc() buffers are safe for non-coherent DMA.
 258  */
 259 static inline bool dma_kmalloc_safe(struct device *dev,
 260                                     enum dma_data_direction dir)
 261 {
 262         /*
 263          * If DMA bouncing of kmalloc() buffers is disabled, the kmalloc()
 264          * caches have already been aligned to a DMA-safe size.
 265          */
 266         if (!IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC))
 267                 return true;
 268
 269         /*
 270          * kmalloc() buffers are DMA-safe irrespective of size if the device
 271          * is coherent or the direction is DMA_TO_DEVICE (non-desctructive
 272          * cache maintenance and benign cache line evictions).
 273          */
 274         if (dev_is_dma_coherent(dev) || dir == DMA_TO_DEVICE)
 275                 return true;
 276
 277         return false;
 278 }
 279
 280 /*
 281  * Check whether the given size, assuming it is for a kmalloc()'ed buffer, is
 282  * sufficiently aligned for non-coherent DMA.
 283  */
 284 static inline bool dma_kmalloc_size_aligned(size_t size)
 285 {
 286         /*
 287          * Larger kmalloc() sizes are guaranteed to be aligned to
 288          * ARCH_DMA_MINALIGN.
 289          */
 290         if (size >= 2 * ARCH_DMA_MINALIGN ||
 291             IS_ALIGNED(kmalloc_size_roundup(size), dma_get_cache_alignment()))
 292                 return true;
 293
 294         return false;
 295 }
 296
 297 /*
 298  * Check whether the given object size may have originated from a kmalloc()
 299  * buffer with a slab alignment below the DMA-safe alignment and needs
 300  * bouncing for non-coherent DMA. The pointer alignment is not considered and
 301  * in-structure DMA-safe offsets are the responsibility of the caller. Such
 302  * code should use the static ARCH_DMA_MINALIGN for compiler annotations.
 303  *
 304  * The heuristics can have false positives, bouncing unnecessarily, though the
 305  * buffers would be small. False negatives are theoretically possible if, for
 306  * example, multiple small kmalloc() buffers are coalesced into a larger
 307  * buffer that passes the alignment check. There are no such known constructs
 308  * in the kernel.
 309  */
 310 static inline bool dma_kmalloc_needs_bounce(struct device *dev, size_t size,
 311                                             enum dma_data_direction dir)
 312 {
 313         return !dma_kmalloc_safe(dev, dir) && !dma_kmalloc_size_aligned(size);
 314 }
 315
 316 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 317                 gfp_t gfp, unsigned long attrs);
 318 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
 319                 dma_addr_t dma_addr, unsigned long attrs);
 320
 321 #ifdef CONFIG_ARCH_HAS_DMA_SET_MASK
 322 void arch_dma_set_mask(struct device *dev, u64 mask);
 323 #else
 324 #define arch_dma_set_mask(dev, mask)    do { } while (0)
 325 #endif
 326
 327 #ifdef CONFIG_MMU
 328 /*
 329  * Page protection so that devices that can't snoop CPU caches can use the
 330  * memory coherently.  We default to pgprot_noncached which is usually used
 331  * for ioremap as a safe bet, but architectures can override this with less
 332  * strict semantics if possible.
 333  */
 334 #ifndef pgprot_dmacoherent
 335 #define pgprot_dmacoherent(prot)        pgprot_noncached(prot)
 336 #endif
 337
 338 pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs);
 339 #else
 340 static inline pgprot_t dma_pgprot(struct device *dev, pgprot_t prot,
 341                 unsigned long attrs)
 342 {
 343         return prot;    /* no protection bits supported without page tables */
 344 }
 345 #endif /* CONFIG_MMU */
 346
 347 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE
 348 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
 349                 enum dma_data_direction dir);
 350 #else
 351 static inline void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
 352                 enum dma_data_direction dir)
 353 {
 354 }
 355 #endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */
 356
 357 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
 358 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
 359                 enum dma_data_direction dir);
 360 #else
 361 static inline void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
 362                 enum dma_data_direction dir)
 363 {
 364 }
 365 #endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */
 366
 367 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
 368 void arch_sync_dma_for_cpu_all(void);
 369 #else
 370 static inline void arch_sync_dma_for_cpu_all(void)
 371 {
 372 }
 373 #endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
 374
 375 #ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT
 376 void arch_dma_prep_coherent(struct page *page, size_t size);
 377 #else
 378 static inline void arch_dma_prep_coherent(struct page *page, size_t size)
 379 {
 380 }
 381 #endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
 382
 383 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
 384 void arch_dma_mark_clean(phys_addr_t paddr, size_t size);
 385 #else
 386 static inline void arch_dma_mark_clean(phys_addr_t paddr, size_t size)
 387 {
 388 }
 389 #endif /* ARCH_HAS_DMA_MARK_CLEAN */
 390
 391 void *arch_dma_set_uncached(void *addr, size_t size);
 392 void arch_dma_clear_uncached(void *addr, size_t size);
 393
 394 #ifdef CONFIG_ARCH_HAS_DMA_MAP_DIRECT
 395 bool arch_dma_map_page_direct(struct device *dev, phys_addr_t addr);
 396 bool arch_dma_unmap_page_direct(struct device *dev, dma_addr_t dma_handle);
 397 bool arch_dma_map_sg_direct(struct device *dev, struct scatterlist *sg,
 398                 int nents);
 399 bool arch_dma_unmap_sg_direct(struct device *dev, struct scatterlist *sg,
 400                 int nents);
 401 #else
 402 #define arch_dma_map_page_direct(d, a)          (false)
 403 #define arch_dma_unmap_page_direct(d, a)        (false)
 404 #define arch_dma_map_sg_direct(d, s, n)         (false)
 405 #define arch_dma_unmap_sg_direct(d, s, n)       (false)
 406 #endif
 407
 408 #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
 409 void arch_setup_dma_ops(struct device *dev, bool coherent);
 410 #else
 411 static inline void arch_setup_dma_ops(struct device *dev, bool coherent)
 412 {
 413 }
 414 #endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */
 415
 416 #ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS
 417 void arch_teardown_dma_ops(struct device *dev);
 418 #else
 419 static inline void arch_teardown_dma_ops(struct device *dev)
 420 {
 421 }
 422 #endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */
 423
 424 #ifdef CONFIG_DMA_API_DEBUG
 425 void dma_debug_add_bus(const struct bus_type *bus);
 426 void debug_dma_dump_mappings(struct device *dev);
 427 #else
 428 static inline void dma_debug_add_bus(const struct bus_type *bus)
 429 {
 430 }
 431 static inline void debug_dma_dump_mappings(struct device *dev)
 432 {
 433 }
 434 #endif /* CONFIG_DMA_API_DEBUG */
 435
 436 extern const struct dma_map_ops dma_dummy_ops;
 437
 438 enum pci_p2pdma_map_type {
 439         /*
 440          * PCI_P2PDMA_MAP_UNKNOWN: Used internally for indicating the mapping
 441          * type hasn't been calculated yet. Functions that return this enum
 442          * never return this value.
 443          */
 444         PCI_P2PDMA_MAP_UNKNOWN = 0,
 445
 446         /*
 447          * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will
 448          * traverse the host bridge and the host bridge is not in the
 449          * allowlist. DMA Mapping routines should return an error when
 450          * this is returned.
 451          */
 452         PCI_P2PDMA_MAP_NOT_SUPPORTED,
 453
 454         /*
 455          * PCI_P2PDMA_BUS_ADDR: Indicates that two devices can talk to
 456          * each other directly through a PCI switch and the transaction will
 457          * not traverse the host bridge. Such a mapping should program
 458          * the DMA engine with PCI bus addresses.
 459          */
 460         PCI_P2PDMA_MAP_BUS_ADDR,
 461
 462         /*
 463          * PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: Indicates two devices can talk
 464          * to each other, but the transaction traverses a host bridge on the
 465          * allowlist. In this case, a normal mapping either with CPU physical
 466          * addresses (in the case of dma-direct) or IOVA addresses (in the
 467          * case of IOMMUs) should be used to program the DMA engine.
 468          */
 469         PCI_P2PDMA_MAP_THRU_HOST_BRIDGE,
 470 };
 471
 472 struct pci_p2pdma_map_state {
 473         struct dev_pagemap *pgmap;
 474         int map;
 475         u64 bus_off;
 476 };
 477
 478 #ifdef CONFIG_PCI_P2PDMA
 479 enum pci_p2pdma_map_type
 480 pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev,
 481                        struct scatterlist *sg);
 482 #else /* CONFIG_PCI_P2PDMA */
 483 static inline enum pci_p2pdma_map_type
 484 pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev,
 485                        struct scatterlist *sg)
 486 {
 487         return PCI_P2PDMA_MAP_NOT_SUPPORTED;
 488 }
 489 #endif /* CONFIG_PCI_P2PDMA */
 490
 491 #endif /* _LINUX_DMA_MAP_OPS_H */