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 12 struct cma; 13 14 struct dma_map_ops { 15 void *(*alloc)(struct device *dev, size_t size, 16 dma_addr_t *dma_handle, gfp_t gfp, 17 unsigned long attrs); 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, 22 gfp_t gfp); 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, 27 gfp_t gfp); 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); 32 33 int (*get_sgtable)(struct device *dev, struct sg_table *sgt, 34 void *cpu_addr, dma_addr_t dma_addr, size_t size, 35 unsigned long attrs); 36 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, 42 unsigned long attrs); 43 /* 44 * map_sg returns 0 on error and a value > 0 on success. 45 * It should never return a value < 0. 46 */ 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, 53 unsigned long attrs); 54 void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle, 55 size_t size, enum dma_data_direction dir, 56 unsigned long attrs); 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); 72 }; 73 74 #ifdef CONFIG_DMA_OPS 75 #include <asm/dma-mapping.h> 76 77 static inline const struct dma_map_ops *get_dma_ops(struct device *dev) 78 { 79 if (dev->dma_ops) 80 return dev->dma_ops; 81 return get_arch_dma_ops(dev->bus); 82 } 83 84 static inline void set_dma_ops(struct device *dev, 85 const struct dma_map_ops *dma_ops) 86 { 87 dev->dma_ops = dma_ops; 88 } 89 #else /* CONFIG_DMA_OPS */ 90 static inline const struct dma_map_ops *get_dma_ops(struct device *dev) 91 { 92 return NULL; 93 } 94 static inline void set_dma_ops(struct device *dev, 95 const struct dma_map_ops *dma_ops) 96 { 97 } 98 #endif /* CONFIG_DMA_OPS */ 99 100 #ifdef CONFIG_DMA_CMA 101 extern struct cma *dma_contiguous_default_area; 102 103 static inline struct cma *dev_get_cma_area(struct device *dev) 104 { 105 if (dev && dev->cma_area) 106 return dev->cma_area; 107 return dma_contiguous_default_area; 108 } 109 110 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); 113 114 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, 117 int count); 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); 120 121 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) 124 { 125 return NULL; 126 } 127 static inline void dma_contiguous_reserve(phys_addr_t limit) 128 { 129 } 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, 132 bool fixed) 133 { 134 return -ENOSYS; 135 } 136 static inline struct page *dma_alloc_from_contiguous(struct device *dev, 137 size_t count, unsigned int order, bool no_warn) 138 { 139 return NULL; 140 } 141 static inline bool dma_release_from_contiguous(struct device *dev, 142 struct page *pages, int count) 143 { 144 return false; 145 } 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, 148 gfp_t gfp) 149 { 150 return NULL; 151 } 152 static inline void dma_free_contiguous(struct device *dev, struct page *page, 153 size_t size) 154 { 155 __free_pages(page, get_order(size)); 156 } 157 #endif /* CONFIG_DMA_CMA*/ 158 159 #ifdef CONFIG_DMA_PERNUMA_CMA 160 void dma_pernuma_cma_reserve(void); 161 #else 162 static inline void dma_pernuma_cma_reserve(void) { } 163 #endif /* CONFIG_DMA_PERNUMA_CMA */ 164 165 #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); 173 174 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); 179 180 #else 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) 183 { 184 return -ENOSYS; 185 } 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) 189 190 static inline void *dma_alloc_from_global_coherent(struct device *dev, 191 ssize_t size, dma_addr_t *dma_handle) 192 { 193 return NULL; 194 } 195 static inline int dma_release_from_global_coherent(int order, void *vaddr) 196 { 197 return 0; 198 } 199 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma, 200 void *cpu_addr, size_t size, int *ret) 201 { 202 return 0; 203 } 204 #endif /* CONFIG_DMA_DECLARE_COHERENT */ 205 206 #ifdef CONFIG_ARCH_HAS_DMA_COHERENCE_H 207 #include <asm/dma-coherence.h> 208 #elif defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ 209 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ 210 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) 211 static inline bool dev_is_dma_coherent(struct device *dev) 212 { 213 return dev->dma_coherent; 214 } 215 #else 216 static inline bool dev_is_dma_coherent(struct device *dev) 217 { 218 return true; 219 } 220 #endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */ 221 222 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, 223 gfp_t gfp, unsigned long attrs); 224 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, 225 dma_addr_t dma_addr, unsigned long attrs); 226 227 #ifdef CONFIG_MMU 228 /* 229 * Page protection so that devices that can't snoop CPU caches can use the 230 * memory coherently. We default to pgprot_noncached which is usually used 231 * for ioremap as a safe bet, but architectures can override this with less 232 * strict semantics if possible. 233 */ 234 #ifndef pgprot_dmacoherent 235 #define pgprot_dmacoherent(prot) pgprot_noncached(prot) 236 #endif 237 238 pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs); 239 #else 240 static inline pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, 241 unsigned long attrs) 242 { 243 return prot; /* no protection bits supported without page tables */ 244 } 245 #endif /* CONFIG_MMU */ 246 247 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE 248 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, 249 enum dma_data_direction dir); 250 #else 251 static inline void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, 252 enum dma_data_direction dir) 253 { 254 } 255 #endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */ 256 257 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU 258 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, 259 enum dma_data_direction dir); 260 #else 261 static inline void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, 262 enum dma_data_direction dir) 263 { 264 } 265 #endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */ 266 267 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL 268 void arch_sync_dma_for_cpu_all(void); 269 #else 270 static inline void arch_sync_dma_for_cpu_all(void) 271 { 272 } 273 #endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */ 274 275 #ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT 276 void arch_dma_prep_coherent(struct page *page, size_t size); 277 #else 278 static inline void arch_dma_prep_coherent(struct page *page, size_t size) 279 { 280 } 281 #endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */ 282 283 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN 284 void arch_dma_mark_clean(phys_addr_t paddr, size_t size); 285 #else 286 static inline void arch_dma_mark_clean(phys_addr_t paddr, size_t size) 287 { 288 } 289 #endif /* ARCH_HAS_DMA_MARK_CLEAN */ 290 291 void *arch_dma_set_uncached(void *addr, size_t size); 292 void arch_dma_clear_uncached(void *addr, size_t size); 293 294 #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS 295 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, 296 const struct iommu_ops *iommu, bool coherent); 297 #else 298 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, 299 u64 size, const struct iommu_ops *iommu, bool coherent) 300 { 301 } 302 #endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */ 303 304 #ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS 305 void arch_teardown_dma_ops(struct device *dev); 306 #else 307 static inline void arch_teardown_dma_ops(struct device *dev) 308 { 309 } 310 #endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */ 311 312 #ifdef CONFIG_DMA_API_DEBUG 313 void dma_debug_add_bus(struct bus_type *bus); 314 void debug_dma_dump_mappings(struct device *dev); 315 #else 316 static inline void dma_debug_add_bus(struct bus_type *bus) 317 { 318 } 319 static inline void debug_dma_dump_mappings(struct device *dev) 320 { 321 } 322 #endif /* CONFIG_DMA_API_DEBUG */ 323 324 extern const struct dma_map_ops dma_dummy_ops; 325 326 #endif /* _LINUX_DMA_MAP_OPS_H */ 327