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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 | ||
0b1abd1f CH |
11 | struct cma; |
12 | ||
0a0f0d8b CH |
13 | struct dma_map_ops { |
14 | void *(*alloc)(struct device *dev, size_t size, | |
15 | dma_addr_t *dma_handle, gfp_t gfp, | |
16 | unsigned long attrs); | |
17 | void (*free)(struct device *dev, size_t size, void *vaddr, | |
18 | dma_addr_t dma_handle, unsigned long attrs); | |
19 | struct page *(*alloc_pages)(struct device *dev, size_t size, | |
20 | dma_addr_t *dma_handle, enum dma_data_direction dir, | |
21 | gfp_t gfp); | |
22 | void (*free_pages)(struct device *dev, size_t size, struct page *vaddr, | |
23 | dma_addr_t dma_handle, enum dma_data_direction dir); | |
24 | void *(*alloc_noncoherent)(struct device *dev, size_t size, | |
25 | dma_addr_t *dma_handle, enum dma_data_direction dir, | |
26 | gfp_t gfp); | |
27 | void (*free_noncoherent)(struct device *dev, size_t size, void *vaddr, | |
28 | dma_addr_t dma_handle, enum dma_data_direction dir); | |
29 | int (*mmap)(struct device *, struct vm_area_struct *, | |
30 | void *, dma_addr_t, size_t, unsigned long attrs); | |
31 | ||
32 | int (*get_sgtable)(struct device *dev, struct sg_table *sgt, | |
33 | void *cpu_addr, dma_addr_t dma_addr, size_t size, | |
34 | unsigned long attrs); | |
35 | ||
36 | dma_addr_t (*map_page)(struct device *dev, struct page *page, | |
37 | unsigned long offset, size_t size, | |
38 | enum dma_data_direction dir, unsigned long attrs); | |
39 | void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, | |
40 | size_t size, enum dma_data_direction dir, | |
41 | unsigned long attrs); | |
42 | /* | |
43 | * map_sg returns 0 on error and a value > 0 on success. | |
44 | * It should never return a value < 0. | |
45 | */ | |
46 | int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, | |
47 | enum dma_data_direction dir, unsigned long attrs); | |
48 | void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, | |
49 | enum dma_data_direction dir, unsigned long attrs); | |
50 | dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr, | |
51 | size_t size, enum dma_data_direction dir, | |
52 | unsigned long attrs); | |
53 | void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle, | |
54 | size_t size, enum dma_data_direction dir, | |
55 | unsigned long attrs); | |
56 | void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle, | |
57 | size_t size, enum dma_data_direction dir); | |
58 | void (*sync_single_for_device)(struct device *dev, | |
59 | dma_addr_t dma_handle, size_t size, | |
60 | enum dma_data_direction dir); | |
61 | void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, | |
62 | int nents, enum dma_data_direction dir); | |
63 | void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg, | |
64 | int nents, enum dma_data_direction dir); | |
65 | void (*cache_sync)(struct device *dev, void *vaddr, size_t size, | |
66 | enum dma_data_direction direction); | |
67 | int (*dma_supported)(struct device *dev, u64 mask); | |
68 | u64 (*get_required_mask)(struct device *dev); | |
69 | size_t (*max_mapping_size)(struct device *dev); | |
70 | unsigned long (*get_merge_boundary)(struct device *dev); | |
71 | }; | |
72 | ||
73 | #ifdef CONFIG_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(dev->bus); | |
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_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_DMA_OPS */ | |
98 | ||
0b1abd1f CH |
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 | #else /* CONFIG_DMA_CMA */ | |
120 | static inline struct cma *dev_get_cma_area(struct device *dev) | |
121 | { | |
122 | return NULL; | |
123 | } | |
124 | static inline void dma_contiguous_reserve(phys_addr_t limit) | |
125 | { | |
126 | } | |
127 | static inline int dma_contiguous_reserve_area(phys_addr_t size, | |
128 | phys_addr_t base, phys_addr_t limit, struct cma **res_cma, | |
129 | bool fixed) | |
130 | { | |
131 | return -ENOSYS; | |
132 | } | |
133 | static inline struct page *dma_alloc_from_contiguous(struct device *dev, | |
134 | size_t count, unsigned int order, bool no_warn) | |
135 | { | |
136 | return NULL; | |
137 | } | |
138 | static inline bool dma_release_from_contiguous(struct device *dev, | |
139 | struct page *pages, int count) | |
140 | { | |
141 | return false; | |
142 | } | |
143 | /* Use fallback alloc() and free() when CONFIG_DMA_CMA=n */ | |
144 | static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size, | |
145 | gfp_t gfp) | |
146 | { | |
147 | return NULL; | |
148 | } | |
149 | static inline void dma_free_contiguous(struct device *dev, struct page *page, | |
150 | size_t size) | |
151 | { | |
152 | __free_pages(page, get_order(size)); | |
153 | } | |
154 | #endif /* CONFIG_DMA_CMA*/ | |
155 | ||
156 | #ifdef CONFIG_DMA_PERNUMA_CMA | |
157 | void dma_pernuma_cma_reserve(void); | |
158 | #else | |
159 | static inline void dma_pernuma_cma_reserve(void) { } | |
160 | #endif /* CONFIG_DMA_PERNUMA_CMA */ | |
161 | ||
0a0f0d8b CH |
162 | #ifdef CONFIG_DMA_DECLARE_COHERENT |
163 | int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, | |
164 | dma_addr_t device_addr, size_t size); | |
165 | int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size, | |
166 | dma_addr_t *dma_handle, void **ret); | |
167 | int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr); | |
168 | int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma, | |
169 | void *cpu_addr, size_t size, int *ret); | |
170 | ||
171 | void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size, | |
172 | dma_addr_t *dma_handle); | |
173 | int dma_release_from_global_coherent(int order, void *vaddr); | |
174 | int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr, | |
175 | size_t size, int *ret); | |
176 | ||
177 | #else | |
178 | static inline int dma_declare_coherent_memory(struct device *dev, | |
179 | phys_addr_t phys_addr, dma_addr_t device_addr, size_t size) | |
180 | { | |
181 | return -ENOSYS; | |
182 | } | |
183 | #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0) | |
184 | #define dma_release_from_dev_coherent(dev, order, vaddr) (0) | |
185 | #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0) | |
186 | ||
187 | static inline void *dma_alloc_from_global_coherent(struct device *dev, | |
188 | ssize_t size, dma_addr_t *dma_handle) | |
189 | { | |
190 | return NULL; | |
191 | } | |
192 | static inline int dma_release_from_global_coherent(int order, void *vaddr) | |
193 | { | |
194 | return 0; | |
195 | } | |
196 | static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma, | |
197 | void *cpu_addr, size_t size, int *ret) | |
198 | { | |
199 | return 0; | |
200 | } | |
201 | #endif /* CONFIG_DMA_DECLARE_COHERENT */ | |
202 | ||
203 | #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS | |
204 | void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, | |
205 | const struct iommu_ops *iommu, bool coherent); | |
206 | #else | |
207 | static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, | |
208 | u64 size, const struct iommu_ops *iommu, bool coherent) | |
209 | { | |
210 | } | |
211 | #endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */ | |
212 | ||
213 | #ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS | |
214 | void arch_teardown_dma_ops(struct device *dev); | |
215 | #else | |
216 | static inline void arch_teardown_dma_ops(struct device *dev) | |
217 | { | |
218 | } | |
219 | #endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */ | |
220 | ||
221 | extern const struct dma_map_ops dma_dummy_ops; | |
222 | ||
223 | #endif /* _LINUX_DMA_MAP_OPS_H */ |