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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#include <linux/pgtable.h>
11#include <linux/slab.h>
12
13struct cma;
14struct iommu_ops;
15
16struct 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_phys)(struct device *dev, phys_addr_t phys,
35 size_t size, enum dma_data_direction dir,
36 unsigned long attrs);
37 void (*unmap_phys)(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 void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle,
50 size_t size, enum dma_data_direction dir);
51 void (*sync_single_for_device)(struct device *dev,
52 dma_addr_t dma_handle, size_t size,
53 enum dma_data_direction dir);
54 void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg,
55 int nents, enum dma_data_direction dir);
56 void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg,
57 int nents, enum dma_data_direction dir);
58 void (*cache_sync)(struct device *dev, void *vaddr, size_t size,
59 enum dma_data_direction direction);
60 int (*dma_supported)(struct device *dev, u64 mask);
61 u64 (*get_required_mask)(struct device *dev);
62 size_t (*max_mapping_size)(struct device *dev);
63 size_t (*opt_mapping_size)(void);
64 unsigned long (*get_merge_boundary)(struct device *dev);
65};
66
67#ifdef CONFIG_ARCH_HAS_DMA_OPS
68#include <asm/dma-mapping.h>
69
70static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
71{
72 if (dev->dma_ops)
73 return dev->dma_ops;
74 return get_arch_dma_ops();
75}
76
77static inline void set_dma_ops(struct device *dev,
78 const struct dma_map_ops *dma_ops)
79{
80 dev->dma_ops = dma_ops;
81}
82#else /* CONFIG_ARCH_HAS_DMA_OPS */
83static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
84{
85 return NULL;
86}
87static inline void set_dma_ops(struct device *dev,
88 const struct dma_map_ops *dma_ops)
89{
90}
91#endif /* CONFIG_ARCH_HAS_DMA_OPS */
92
93#ifdef CONFIG_DMA_CMA
94extern struct cma *dma_contiguous_default_area;
95
96static inline struct cma *dev_get_cma_area(struct device *dev)
97{
98 if (dev && dev->cma_area)
99 return dev->cma_area;
100 return dma_contiguous_default_area;
101}
102
103void dma_contiguous_reserve(phys_addr_t addr_limit);
104int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
105 phys_addr_t limit, struct cma **res_cma, bool fixed);
106
107struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
108 unsigned int order, bool no_warn);
109bool dma_release_from_contiguous(struct device *dev, struct page *pages,
110 int count);
111struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp);
112void dma_free_contiguous(struct device *dev, struct page *page, size_t size);
113
114void dma_contiguous_early_fixup(phys_addr_t base, unsigned long size);
115#else /* CONFIG_DMA_CMA */
116static inline struct cma *dev_get_cma_area(struct device *dev)
117{
118 return NULL;
119}
120static inline void dma_contiguous_reserve(phys_addr_t limit)
121{
122}
123static inline int dma_contiguous_reserve_area(phys_addr_t size,
124 phys_addr_t base, phys_addr_t limit, struct cma **res_cma,
125 bool fixed)
126{
127 return -ENOSYS;
128}
129static inline struct page *dma_alloc_from_contiguous(struct device *dev,
130 size_t count, unsigned int order, bool no_warn)
131{
132 return NULL;
133}
134static inline bool dma_release_from_contiguous(struct device *dev,
135 struct page *pages, int count)
136{
137 return false;
138}
139/* Use fallback alloc() and free() when CONFIG_DMA_CMA=n */
140static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size,
141 gfp_t gfp)
142{
143 return NULL;
144}
145static inline void dma_free_contiguous(struct device *dev, struct page *page,
146 size_t size)
147{
148 __free_pages(page, get_order(size));
149}
150static inline void dma_contiguous_early_fixup(phys_addr_t base, unsigned long size)
151{
152}
153#endif /* CONFIG_DMA_CMA*/
154
155#ifdef CONFIG_DMA_DECLARE_COHERENT
156int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
157 dma_addr_t device_addr, size_t size);
158void dma_release_coherent_memory(struct device *dev);
159int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
160 dma_addr_t *dma_handle, void **ret);
161int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
162int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
163 void *cpu_addr, size_t size, int *ret);
164#else
165static inline int dma_declare_coherent_memory(struct device *dev,
166 phys_addr_t phys_addr, dma_addr_t device_addr, size_t size)
167{
168 return -ENOSYS;
169}
170
171#define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
172#define dma_release_from_dev_coherent(dev, order, vaddr) (0)
173#define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
174static inline void dma_release_coherent_memory(struct device *dev) { }
175#endif /* CONFIG_DMA_DECLARE_COHERENT */
176
177#ifdef CONFIG_DMA_GLOBAL_POOL
178void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size,
179 dma_addr_t *dma_handle);
180int dma_release_from_global_coherent(int order, void *vaddr);
181int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
182 size_t size, int *ret);
183int dma_init_global_coherent(phys_addr_t phys_addr, size_t size);
184#else
185static inline void *dma_alloc_from_global_coherent(struct device *dev,
186 ssize_t size, dma_addr_t *dma_handle)
187{
188 return NULL;
189}
190static inline int dma_release_from_global_coherent(int order, void *vaddr)
191{
192 return 0;
193}
194static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
195 void *cpu_addr, size_t size, int *ret)
196{
197 return 0;
198}
199#endif /* CONFIG_DMA_GLOBAL_POOL */
200
201int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
202 void *cpu_addr, dma_addr_t dma_addr, size_t size,
203 unsigned long attrs);
204int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
205 void *cpu_addr, dma_addr_t dma_addr, size_t size,
206 unsigned long attrs);
207struct page *dma_common_alloc_pages(struct device *dev, size_t size,
208 dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
209void dma_common_free_pages(struct device *dev, size_t size, struct page *vaddr,
210 dma_addr_t dma_handle, enum dma_data_direction dir);
211
212struct page **dma_common_find_pages(void *cpu_addr);
213void *dma_common_contiguous_remap(struct page *page, size_t size, pgprot_t prot,
214 const void *caller);
215void *dma_common_pages_remap(struct page **pages, size_t size, pgprot_t prot,
216 const void *caller);
217void dma_common_free_remap(void *cpu_addr, size_t size);
218
219struct page *dma_alloc_from_pool(struct device *dev, size_t size,
220 void **cpu_addr, gfp_t flags,
221 bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t));
222bool dma_free_from_pool(struct device *dev, void *start, size_t size);
223
224int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start,
225 dma_addr_t dma_start, u64 size);
226
227#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
228 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
229 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
230extern bool dma_default_coherent;
231static inline bool dev_is_dma_coherent(struct device *dev)
232{
233 return dev->dma_coherent;
234}
235#else
236#define dma_default_coherent true
237
238static inline bool dev_is_dma_coherent(struct device *dev)
239{
240 return true;
241}
242#endif
243
244static inline void dma_reset_need_sync(struct device *dev)
245{
246#ifdef CONFIG_DMA_NEED_SYNC
247 /* Reset it only once so that the function can be called on hotpath */
248 if (unlikely(dev->dma_skip_sync))
249 dev->dma_skip_sync = false;
250#endif
251}
252
253/*
254 * Check whether potential kmalloc() buffers are safe for non-coherent DMA.
255 */
256static inline bool dma_kmalloc_safe(struct device *dev,
257 enum dma_data_direction dir)
258{
259 /*
260 * If DMA bouncing of kmalloc() buffers is disabled, the kmalloc()
261 * caches have already been aligned to a DMA-safe size.
262 */
263 if (!IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC))
264 return true;
265
266 /*
267 * kmalloc() buffers are DMA-safe irrespective of size if the device
268 * is coherent or the direction is DMA_TO_DEVICE (non-desctructive
269 * cache maintenance and benign cache line evictions).
270 */
271 if (dev_is_dma_coherent(dev) || dir == DMA_TO_DEVICE)
272 return true;
273
274 return false;
275}
276
277/*
278 * Check whether the given size, assuming it is for a kmalloc()'ed buffer, is
279 * sufficiently aligned for non-coherent DMA.
280 */
281static inline bool dma_kmalloc_size_aligned(size_t size)
282{
283 /*
284 * Larger kmalloc() sizes are guaranteed to be aligned to
285 * ARCH_DMA_MINALIGN.
286 */
287 if (size >= 2 * ARCH_DMA_MINALIGN ||
288 IS_ALIGNED(kmalloc_size_roundup(size), dma_get_cache_alignment()))
289 return true;
290
291 return false;
292}
293
294/*
295 * Check whether the given object size may have originated from a kmalloc()
296 * buffer with a slab alignment below the DMA-safe alignment and needs
297 * bouncing for non-coherent DMA. The pointer alignment is not considered and
298 * in-structure DMA-safe offsets are the responsibility of the caller. Such
299 * code should use the static ARCH_DMA_MINALIGN for compiler annotations.
300 *
301 * The heuristics can have false positives, bouncing unnecessarily, though the
302 * buffers would be small. False negatives are theoretically possible if, for
303 * example, multiple small kmalloc() buffers are coalesced into a larger
304 * buffer that passes the alignment check. There are no such known constructs
305 * in the kernel.
306 */
307static inline bool dma_kmalloc_needs_bounce(struct device *dev, size_t size,
308 enum dma_data_direction dir)
309{
310 return !dma_kmalloc_safe(dev, dir) && !dma_kmalloc_size_aligned(size);
311}
312
313void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
314 gfp_t gfp, unsigned long attrs);
315void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
316 dma_addr_t dma_addr, unsigned long attrs);
317
318#ifdef CONFIG_ARCH_HAS_DMA_SET_MASK
319void arch_dma_set_mask(struct device *dev, u64 mask);
320#else
321#define arch_dma_set_mask(dev, mask) do { } while (0)
322#endif
323
324#ifdef CONFIG_MMU
325/*
326 * Page protection so that devices that can't snoop CPU caches can use the
327 * memory coherently. We default to pgprot_noncached which is usually used
328 * for ioremap as a safe bet, but architectures can override this with less
329 * strict semantics if possible.
330 */
331#ifndef pgprot_dmacoherent
332#define pgprot_dmacoherent(prot) pgprot_noncached(prot)
333#endif
334
335pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs);
336#else
337static inline pgprot_t dma_pgprot(struct device *dev, pgprot_t prot,
338 unsigned long attrs)
339{
340 return prot; /* no protection bits supported without page tables */
341}
342#endif /* CONFIG_MMU */
343
344#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE
345void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
346 enum dma_data_direction dir);
347#else
348static inline void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
349 enum dma_data_direction dir)
350{
351}
352#endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */
353
354#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
355void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
356 enum dma_data_direction dir);
357#else
358static inline void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
359 enum dma_data_direction dir)
360{
361}
362#endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */
363
364#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
365void arch_sync_dma_for_cpu_all(void);
366#else
367static inline void arch_sync_dma_for_cpu_all(void)
368{
369}
370#endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
371
372#ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT
373void arch_dma_prep_coherent(struct page *page, size_t size);
374#else
375static inline void arch_dma_prep_coherent(struct page *page, size_t size)
376{
377}
378#endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
379
380#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
381void arch_dma_mark_clean(phys_addr_t paddr, size_t size);
382#else
383static inline void arch_dma_mark_clean(phys_addr_t paddr, size_t size)
384{
385}
386#endif /* ARCH_HAS_DMA_MARK_CLEAN */
387
388void *arch_dma_set_uncached(void *addr, size_t size);
389void arch_dma_clear_uncached(void *addr, size_t size);
390
391#ifdef CONFIG_ARCH_HAS_DMA_MAP_DIRECT
392bool arch_dma_map_phys_direct(struct device *dev, phys_addr_t addr);
393bool arch_dma_unmap_phys_direct(struct device *dev, dma_addr_t dma_handle);
394bool arch_dma_map_sg_direct(struct device *dev, struct scatterlist *sg,
395 int nents);
396bool arch_dma_unmap_sg_direct(struct device *dev, struct scatterlist *sg,
397 int nents);
398#else
399#define arch_dma_map_phys_direct(d, a) (false)
400#define arch_dma_unmap_phys_direct(d, a) (false)
401#define arch_dma_map_sg_direct(d, s, n) (false)
402#define arch_dma_unmap_sg_direct(d, s, n) (false)
403#endif
404
405#ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
406void arch_setup_dma_ops(struct device *dev, bool coherent);
407#else
408static inline void arch_setup_dma_ops(struct device *dev, bool coherent)
409{
410}
411#endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */
412
413#ifdef CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS
414void arch_teardown_dma_ops(struct device *dev);
415#else
416static inline void arch_teardown_dma_ops(struct device *dev)
417{
418}
419#endif /* CONFIG_ARCH_HAS_TEARDOWN_DMA_OPS */
420
421#ifdef CONFIG_DMA_API_DEBUG
422void dma_debug_add_bus(const struct bus_type *bus);
423void debug_dma_dump_mappings(struct device *dev);
424#else
425static inline void dma_debug_add_bus(const struct bus_type *bus)
426{
427}
428static inline void debug_dma_dump_mappings(struct device *dev)
429{
430}
431#endif /* CONFIG_DMA_API_DEBUG */
432
433extern const struct dma_map_ops dma_dummy_ops;
434#endif /* _LINUX_DMA_MAP_OPS_H */
435

source code of linux/include/linux/dma-map-ops.h