1 /* SPDX-License-Identifier: GPL-2.0 */
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.
6 #ifndef _LINUX_DMA_MAP_OPS_H
7 #define _LINUX_DMA_MAP_OPS_H
9 #include <linux/dma-mapping.h>
10 #include <linux/pgtable.h>
15 * Values for struct dma_map_ops.flags:
17 * DMA_F_PCI_P2PDMA_SUPPORTED: Indicates the dma_map_ops implementation can
18 * handle PCI P2PDMA pages in the map_sg/unmap_sg operation.
20 #define DMA_F_PCI_P2PDMA_SUPPORTED (1 << 0)
25 void *(*alloc)(struct device *dev, size_t size,
26 dma_addr_t *dma_handle, gfp_t gfp,
28 void (*free)(struct device *dev, size_t size, void *vaddr,
29 dma_addr_t dma_handle, unsigned long attrs);
30 struct page *(*alloc_pages)(struct device *dev, size_t size,
31 dma_addr_t *dma_handle, enum dma_data_direction dir,
33 void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
34 dma_addr_t dma_handle, enum dma_data_direction dir);
35 struct sg_table *(*alloc_noncontiguous)(struct device *dev, size_t size,
36 enum dma_data_direction dir, gfp_t gfp,
38 void (*free_noncontiguous)(struct device *dev, size_t size,
39 struct sg_table *sgt, enum dma_data_direction dir);
40 int (*mmap)(struct device *, struct vm_area_struct *,
41 void *, dma_addr_t, size_t, unsigned long attrs);
43 int (*get_sgtable)(struct device *dev, struct sg_table *sgt,
44 void *cpu_addr, dma_addr_t dma_addr, size_t size,
47 dma_addr_t (*map_page)(struct device *dev, struct page *page,
48 unsigned long offset, size_t size,
49 enum dma_data_direction dir, unsigned long attrs);
50 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
51 size_t size, enum dma_data_direction dir,
54 * map_sg should return a negative error code on error. See
55 * dma_map_sgtable() for a list of appropriate error codes
58 int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents,
59 enum dma_data_direction dir, unsigned long attrs);
60 void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents,
61 enum dma_data_direction dir, unsigned long attrs);
62 dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
63 size_t size, enum dma_data_direction dir,
65 void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
66 size_t size, enum dma_data_direction dir,
68 void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle,
69 size_t size, enum dma_data_direction dir);
70 void (*sync_single_for_device)(struct device *dev,
71 dma_addr_t dma_handle, size_t size,
72 enum dma_data_direction dir);
73 void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg,
74 int nents, enum dma_data_direction dir);
75 void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg,
76 int nents, enum dma_data_direction dir);
77 void (*cache_sync)(struct device *dev, void *vaddr, size_t size,
78 enum dma_data_direction direction);
79 int (*dma_supported)(struct device *dev, u64 mask);
80 u64 (*get_required_mask)(struct device *dev);
81 size_t (*max_mapping_size)(struct device *dev);
82 size_t (*opt_mapping_size)(void);
83 unsigned long (*get_merge_boundary)(struct device *dev);
87 #include <asm/dma-mapping.h>
89 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
93 return get_arch_dma_ops(dev->bus);
96 static inline void set_dma_ops(struct device *dev,
97 const struct dma_map_ops *dma_ops)
99 dev->dma_ops = dma_ops;
101 #else /* CONFIG_DMA_OPS */
102 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
106 static inline void set_dma_ops(struct device *dev,
107 const struct dma_map_ops *dma_ops)
110 #endif /* CONFIG_DMA_OPS */
112 #ifdef CONFIG_DMA_CMA
113 extern struct cma *dma_contiguous_default_area;
115 static inline struct cma *dev_get_cma_area(struct device *dev)
117 if (dev && dev->cma_area)
118 return dev->cma_area;
119 return dma_contiguous_default_area;
122 void dma_contiguous_reserve(phys_addr_t addr_limit);
123 int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
124 phys_addr_t limit, struct cma **res_cma, bool fixed);
126 struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
127 unsigned int order, bool no_warn);
128 bool dma_release_from_contiguous(struct device *dev, struct page *pages,
130 struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp);
131 void dma_free_contiguous(struct device *dev, struct page *page, size_t size);
133 void dma_contiguous_early_fixup(phys_addr_t base, unsigned long size);
134 #else /* CONFIG_DMA_CMA */
135 static inline struct cma *dev_get_cma_area(struct device *dev)
139 static inline void dma_contiguous_reserve(phys_addr_t limit)
142 static inline int dma_contiguous_reserve_area(phys_addr_t size,
143 phys_addr_t base, phys_addr_t limit, struct cma **res_cma,
148 static inline struct page *dma_alloc_from_contiguous(struct device *dev,
149 size_t count, unsigned int order, bool no_warn)
153 static inline bool dma_release_from_contiguous(struct device *dev,
154 struct page *pages, int count)
158 /* Use fallback alloc() and free() when CONFIG_DMA_CMA=n */
159 static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size,
164 static inline void dma_free_contiguous(struct device *dev, struct page *page,
167 __free_pages(page, get_order(size));
169 #endif /* CONFIG_DMA_CMA*/
171 #ifdef CONFIG_DMA_PERNUMA_CMA
172 void dma_pernuma_cma_reserve(void);
174 static inline void dma_pernuma_cma_reserve(void) { }
175 #endif /* CONFIG_DMA_PERNUMA_CMA */
177 #ifdef CONFIG_DMA_DECLARE_COHERENT
178 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
179 dma_addr_t device_addr, size_t size);
180 int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
181 dma_addr_t *dma_handle, void **ret);
182 int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
183 int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
184 void *cpu_addr, size_t size, int *ret);
186 static inline int dma_declare_coherent_memory(struct device *dev,
187 phys_addr_t phys_addr, dma_addr_t device_addr, size_t size)
191 #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
192 #define dma_release_from_dev_coherent(dev, order, vaddr) (0)
193 #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
194 #endif /* CONFIG_DMA_DECLARE_COHERENT */
196 #ifdef CONFIG_DMA_GLOBAL_POOL
197 void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size,
198 dma_addr_t *dma_handle);
199 int dma_release_from_global_coherent(int order, void *vaddr);
200 int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
201 size_t size, int *ret);
202 int dma_init_global_coherent(phys_addr_t phys_addr, size_t size);
204 static inline void *dma_alloc_from_global_coherent(struct device *dev,
205 ssize_t size, dma_addr_t *dma_handle)
209 static inline int dma_release_from_global_coherent(int order, void *vaddr)
213 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
214 void *cpu_addr, size_t size, int *ret)
218 #endif /* CONFIG_DMA_GLOBAL_POOL */
221 * This is the actual return value from the ->alloc_noncontiguous method.
222 * The users of the DMA API should only care about the sg_table, but to make
223 * the DMA-API internal vmaping and freeing easier we stash away the page
224 * array as well (except for the fallback case). This can go away any time,
225 * e.g. when a vmap-variant that takes a scatterlist comes along.
227 struct dma_sgt_handle {
231 #define sgt_handle(sgt) \
232 container_of((sgt), struct dma_sgt_handle, sgt)
234 int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
235 void *cpu_addr, dma_addr_t dma_addr, size_t size,
236 unsigned long attrs);
237 int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
238 void *cpu_addr, dma_addr_t dma_addr, size_t size,
239 unsigned long attrs);
240 struct page *dma_common_alloc_pages(struct device *dev, size_t size,
241 dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
242 void dma_common_free_pages(struct device *dev, size_t size, struct page *vaddr,
243 dma_addr_t dma_handle, enum dma_data_direction dir);
245 struct page **dma_common_find_pages(void *cpu_addr);
246 void *dma_common_contiguous_remap(struct page *page, size_t size, pgprot_t prot,
248 void *dma_common_pages_remap(struct page **pages, size_t size, pgprot_t prot,
250 void dma_common_free_remap(void *cpu_addr, size_t size);
252 struct page *dma_alloc_from_pool(struct device *dev, size_t size,
253 void **cpu_addr, gfp_t flags,
254 bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t));
255 bool dma_free_from_pool(struct device *dev, void *start, size_t size);
257 int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start,
258 dma_addr_t dma_start, u64 size);
260 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
261 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
262 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
263 extern bool dma_default_coherent;
264 static inline bool dev_is_dma_coherent(struct device *dev)
266 return dev->dma_coherent;
269 static inline bool dev_is_dma_coherent(struct device *dev)
273 #endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */
275 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
276 gfp_t gfp, unsigned long attrs);
277 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
278 dma_addr_t dma_addr, unsigned long attrs);
282 * Page protection so that devices that can't snoop CPU caches can use the
283 * memory coherently. We default to pgprot_noncached which is usually used
284 * for ioremap as a safe bet, but architectures can override this with less
285 * strict semantics if possible.
287 #ifndef pgprot_dmacoherent
288 #define pgprot_dmacoherent(prot) pgprot_noncached(prot)
291 pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs);
293 static inline pgprot_t dma_pgprot(struct device *dev, pgprot_t prot,
296 return prot; /* no protection bits supported without page tables */
298 #endif /* CONFIG_MMU */
300 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE
301 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
302 enum dma_data_direction dir);
304 static inline void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
305 enum dma_data_direction dir)
308 #endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */
310 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
311 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
312 enum dma_data_direction dir);
314 static inline void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
315 enum dma_data_direction dir)
318 #endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */
320 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
321 void arch_sync_dma_for_cpu_all(void);
323 static inline void arch_sync_dma_for_cpu_all(void)
326 #endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
328 #ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT
329 void arch_dma_prep_coherent(struct page *page, size_t size);
331 static inline void arch_dma_prep_coherent(struct page *page, size_t size)
334 #endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
336 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
337 void arch_dma_mark_clean(phys_addr_t paddr, size_t size);
339 static inline void arch_dma_mark_clean(phys_addr_t paddr, size_t size)
342 #endif /* ARCH_HAS_DMA_MARK_CLEAN */
344 void *arch_dma_set_uncached(void *addr, size_t size);
345 void arch_dma_clear_uncached(void *addr, size_t size);
347 #ifdef CONFIG_ARCH_HAS_DMA_MAP_DIRECT
348 bool arch_dma_map_page_direct(struct device *dev, phys_addr_t addr);
349 bool arch_dma_unmap_page_direct(struct device *dev, dma_addr_t dma_handle);
350 bool arch_dma_map_sg_direct(struct device *dev, struct scatterlist *sg,
352 bool arch_dma_unmap_sg_direct(struct device *dev, struct scatterlist *sg,
355 #define arch_dma_map_page_direct(d, a) (false)
356 #define arch_dma_unmap_page_direct(d, a) (false)
357 #define arch_dma_map_sg_direct(d, s, n) (false)
358 #define arch_dma_unmap_sg_direct(d, s, n) (false)
361 #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
362 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
363 const struct iommu_ops *iommu, bool coherent);
365 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
366 u64 size, const struct iommu_ops *iommu, bool coherent)
369 #endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */
371 #ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS
372 void arch_teardown_dma_ops(struct device *dev);
374 static inline void arch_teardown_dma_ops(struct device *dev)
377 #endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */
379 #ifdef CONFIG_DMA_API_DEBUG
380 void dma_debug_add_bus(struct bus_type *bus);
381 void debug_dma_dump_mappings(struct device *dev);
383 static inline void dma_debug_add_bus(struct bus_type *bus)
386 static inline void debug_dma_dump_mappings(struct device *dev)
389 #endif /* CONFIG_DMA_API_DEBUG */
391 extern const struct dma_map_ops dma_dummy_ops;
393 enum pci_p2pdma_map_type {
395 * PCI_P2PDMA_MAP_UNKNOWN: Used internally for indicating the mapping
396 * type hasn't been calculated yet. Functions that return this enum
397 * never return this value.
399 PCI_P2PDMA_MAP_UNKNOWN = 0,
402 * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will
403 * traverse the host bridge and the host bridge is not in the
404 * allowlist. DMA Mapping routines should return an error when
407 PCI_P2PDMA_MAP_NOT_SUPPORTED,
410 * PCI_P2PDMA_BUS_ADDR: Indicates that two devices can talk to
411 * each other directly through a PCI switch and the transaction will
412 * not traverse the host bridge. Such a mapping should program
413 * the DMA engine with PCI bus addresses.
415 PCI_P2PDMA_MAP_BUS_ADDR,
418 * PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: Indicates two devices can talk
419 * to each other, but the transaction traverses a host bridge on the
420 * allowlist. In this case, a normal mapping either with CPU physical
421 * addresses (in the case of dma-direct) or IOVA addresses (in the
422 * case of IOMMUs) should be used to program the DMA engine.
424 PCI_P2PDMA_MAP_THRU_HOST_BRIDGE,
427 struct pci_p2pdma_map_state {
428 struct dev_pagemap *pgmap;
433 #ifdef CONFIG_PCI_P2PDMA
434 enum pci_p2pdma_map_type
435 pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev,
436 struct scatterlist *sg);
437 #else /* CONFIG_PCI_P2PDMA */
438 static inline enum pci_p2pdma_map_type
439 pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev,
440 struct scatterlist *sg)
442 return PCI_P2PDMA_MAP_NOT_SUPPORTED;
444 #endif /* CONFIG_PCI_P2PDMA */
446 #endif /* _LINUX_DMA_MAP_OPS_H */