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 void *(*alloc)(struct device *dev, size_t size,
16 dma_addr_t *dma_handle, gfp_t gfp,
18 void (*free)(struct device *dev, size_t size, void *vaddr,
19 dma_addr_t dma_handle, unsigned long attrs);
20 struct page *(*alloc_pages)(struct device *dev, size_t size,
21 dma_addr_t *dma_handle, enum dma_data_direction dir,
23 void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
24 dma_addr_t dma_handle, enum dma_data_direction dir);
25 void *(*alloc_noncoherent)(struct device *dev, size_t size,
26 dma_addr_t *dma_handle, enum dma_data_direction dir,
28 void (*free_noncoherent)(struct device *dev, size_t size, void *vaddr,
29 dma_addr_t dma_handle, enum dma_data_direction dir);
30 int (*mmap)(struct device *, struct vm_area_struct *,
31 void *, dma_addr_t, size_t, unsigned long attrs);
33 int (*get_sgtable)(struct device *dev, struct sg_table *sgt,
34 void *cpu_addr, dma_addr_t dma_addr, size_t size,
37 dma_addr_t (*map_page)(struct device *dev, struct page *page,
38 unsigned long offset, size_t size,
39 enum dma_data_direction dir, unsigned long attrs);
40 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
41 size_t size, enum dma_data_direction dir,
44 * map_sg returns 0 on error and a value > 0 on success.
45 * It should never return a value < 0.
47 int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents,
48 enum dma_data_direction dir, unsigned long attrs);
49 void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents,
50 enum dma_data_direction dir, unsigned long attrs);
51 dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
52 size_t size, enum dma_data_direction dir,
54 void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
55 size_t size, enum dma_data_direction dir,
57 void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle,
58 size_t size, enum dma_data_direction dir);
59 void (*sync_single_for_device)(struct device *dev,
60 dma_addr_t dma_handle, size_t size,
61 enum dma_data_direction dir);
62 void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg,
63 int nents, enum dma_data_direction dir);
64 void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg,
65 int nents, enum dma_data_direction dir);
66 void (*cache_sync)(struct device *dev, void *vaddr, size_t size,
67 enum dma_data_direction direction);
68 int (*dma_supported)(struct device *dev, u64 mask);
69 u64 (*get_required_mask)(struct device *dev);
70 size_t (*max_mapping_size)(struct device *dev);
71 unsigned long (*get_merge_boundary)(struct device *dev);
75 #include <asm/dma-mapping.h>
77 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
81 return get_arch_dma_ops(dev->bus);
84 static inline void set_dma_ops(struct device *dev,
85 const struct dma_map_ops *dma_ops)
87 dev->dma_ops = dma_ops;
89 #else /* CONFIG_DMA_OPS */
90 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
94 static inline void set_dma_ops(struct device *dev,
95 const struct dma_map_ops *dma_ops)
98 #endif /* CONFIG_DMA_OPS */
100 #ifdef CONFIG_DMA_CMA
101 extern struct cma *dma_contiguous_default_area;
103 static inline struct cma *dev_get_cma_area(struct device *dev)
105 if (dev && dev->cma_area)
106 return dev->cma_area;
107 return dma_contiguous_default_area;
110 void dma_contiguous_reserve(phys_addr_t addr_limit);
111 int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
112 phys_addr_t limit, struct cma **res_cma, bool fixed);
114 struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
115 unsigned int order, bool no_warn);
116 bool dma_release_from_contiguous(struct device *dev, struct page *pages,
118 struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp);
119 void dma_free_contiguous(struct device *dev, struct page *page, size_t size);
121 void dma_contiguous_early_fixup(phys_addr_t base, unsigned long size);
122 #else /* CONFIG_DMA_CMA */
123 static inline struct cma *dev_get_cma_area(struct device *dev)
127 static inline void dma_contiguous_reserve(phys_addr_t limit)
130 static inline int dma_contiguous_reserve_area(phys_addr_t size,
131 phys_addr_t base, phys_addr_t limit, struct cma **res_cma,
136 static inline struct page *dma_alloc_from_contiguous(struct device *dev,
137 size_t count, unsigned int order, bool no_warn)
141 static inline bool dma_release_from_contiguous(struct device *dev,
142 struct page *pages, int count)
146 /* Use fallback alloc() and free() when CONFIG_DMA_CMA=n */
147 static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size,
152 static inline void dma_free_contiguous(struct device *dev, struct page *page,
155 __free_pages(page, get_order(size));
157 #endif /* CONFIG_DMA_CMA*/
159 #ifdef CONFIG_DMA_PERNUMA_CMA
160 void dma_pernuma_cma_reserve(void);
162 static inline void dma_pernuma_cma_reserve(void) { }
163 #endif /* CONFIG_DMA_PERNUMA_CMA */
165 #ifdef CONFIG_DMA_DECLARE_COHERENT
166 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
167 dma_addr_t device_addr, size_t size);
168 int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
169 dma_addr_t *dma_handle, void **ret);
170 int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
171 int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
172 void *cpu_addr, size_t size, int *ret);
174 void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size,
175 dma_addr_t *dma_handle);
176 int dma_release_from_global_coherent(int order, void *vaddr);
177 int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
178 size_t size, int *ret);
181 static inline int dma_declare_coherent_memory(struct device *dev,
182 phys_addr_t phys_addr, dma_addr_t device_addr, size_t size)
186 #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
187 #define dma_release_from_dev_coherent(dev, order, vaddr) (0)
188 #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
190 static inline void *dma_alloc_from_global_coherent(struct device *dev,
191 ssize_t size, dma_addr_t *dma_handle)
195 static inline int dma_release_from_global_coherent(int order, void *vaddr)
199 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
200 void *cpu_addr, size_t size, int *ret)
204 #endif /* CONFIG_DMA_DECLARE_COHERENT */
206 int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
207 void *cpu_addr, dma_addr_t dma_addr, size_t size,
208 unsigned long attrs);
209 int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
210 void *cpu_addr, dma_addr_t dma_addr, size_t size,
211 unsigned long attrs);
212 struct page *dma_common_alloc_pages(struct device *dev, size_t size,
213 dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
214 void dma_common_free_pages(struct device *dev, size_t size, struct page *vaddr,
215 dma_addr_t dma_handle, enum dma_data_direction dir);
217 struct page **dma_common_find_pages(void *cpu_addr);
218 void *dma_common_contiguous_remap(struct page *page, size_t size, pgprot_t prot,
220 void *dma_common_pages_remap(struct page **pages, size_t size, pgprot_t prot,
222 void dma_common_free_remap(void *cpu_addr, size_t size);
224 struct page *dma_alloc_from_pool(struct device *dev, size_t size,
225 void **cpu_addr, gfp_t flags,
226 bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t));
227 bool dma_free_from_pool(struct device *dev, void *start, size_t size);
229 int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start,
230 dma_addr_t dma_start, u64 size);
232 #ifdef CONFIG_ARCH_HAS_DMA_COHERENCE_H
233 #include <asm/dma-coherence.h>
234 #elif defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
235 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
236 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
237 static inline bool dev_is_dma_coherent(struct device *dev)
239 return dev->dma_coherent;
242 static inline bool dev_is_dma_coherent(struct device *dev)
246 #endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */
248 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
249 gfp_t gfp, unsigned long attrs);
250 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
251 dma_addr_t dma_addr, unsigned long attrs);
255 * Page protection so that devices that can't snoop CPU caches can use the
256 * memory coherently. We default to pgprot_noncached which is usually used
257 * for ioremap as a safe bet, but architectures can override this with less
258 * strict semantics if possible.
260 #ifndef pgprot_dmacoherent
261 #define pgprot_dmacoherent(prot) pgprot_noncached(prot)
264 pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs);
266 static inline pgprot_t dma_pgprot(struct device *dev, pgprot_t prot,
269 return prot; /* no protection bits supported without page tables */
271 #endif /* CONFIG_MMU */
273 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE
274 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
275 enum dma_data_direction dir);
277 static inline void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
278 enum dma_data_direction dir)
281 #endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */
283 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
284 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
285 enum dma_data_direction dir);
287 static inline void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
288 enum dma_data_direction dir)
291 #endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */
293 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
294 void arch_sync_dma_for_cpu_all(void);
296 static inline void arch_sync_dma_for_cpu_all(void)
299 #endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
301 #ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT
302 void arch_dma_prep_coherent(struct page *page, size_t size);
304 static inline void arch_dma_prep_coherent(struct page *page, size_t size)
307 #endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
309 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
310 void arch_dma_mark_clean(phys_addr_t paddr, size_t size);
312 static inline void arch_dma_mark_clean(phys_addr_t paddr, size_t size)
315 #endif /* ARCH_HAS_DMA_MARK_CLEAN */
317 void *arch_dma_set_uncached(void *addr, size_t size);
318 void arch_dma_clear_uncached(void *addr, size_t size);
320 #ifdef CONFIG_ARCH_HAS_DMA_MAP_DIRECT
321 bool arch_dma_map_page_direct(struct device *dev, phys_addr_t addr);
322 bool arch_dma_unmap_page_direct(struct device *dev, dma_addr_t dma_handle);
323 bool arch_dma_map_sg_direct(struct device *dev, struct scatterlist *sg,
325 bool arch_dma_unmap_sg_direct(struct device *dev, struct scatterlist *sg,
328 #define arch_dma_map_page_direct(d, a) (false)
329 #define arch_dma_unmap_page_direct(d, a) (false)
330 #define arch_dma_map_sg_direct(d, s, n) (false)
331 #define arch_dma_unmap_sg_direct(d, s, n) (false)
334 #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
335 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
336 const struct iommu_ops *iommu, bool coherent);
338 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
339 u64 size, const struct iommu_ops *iommu, bool coherent)
342 #endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */
344 #ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS
345 void arch_teardown_dma_ops(struct device *dev);
347 static inline void arch_teardown_dma_ops(struct device *dev)
350 #endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */
352 #ifdef CONFIG_DMA_API_DEBUG
353 void dma_debug_add_bus(struct bus_type *bus);
354 void debug_dma_dump_mappings(struct device *dev);
356 static inline void dma_debug_add_bus(struct bus_type *bus)
359 static inline void debug_dma_dump_mappings(struct device *dev)
362 #endif /* CONFIG_DMA_API_DEBUG */
364 extern const struct dma_map_ops dma_dummy_ops;
366 #endif /* _LINUX_DMA_MAP_OPS_H */