1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_DMA_MAPPING_H |
3 | #define _LINUX_DMA_MAPPING_H |
4 | |
5 | #include <linux/cache.h> |
6 | #include <linux/sizes.h> |
7 | #include <linux/string.h> |
8 | #include <linux/device.h> |
9 | #include <linux/err.h> |
10 | #include <linux/dma-direction.h> |
11 | #include <linux/scatterlist.h> |
12 | #include <linux/bug.h> |
13 | #include <linux/mem_encrypt.h> |
14 | |
15 | /** |
16 | * List of possible attributes associated with a DMA mapping. The semantics |
17 | * of each attribute should be defined in Documentation/core-api/dma-attributes.rst. |
18 | */ |
19 | |
20 | /* |
21 | * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping |
22 | * may be weakly ordered, that is that reads and writes may pass each other. |
23 | */ |
24 | #define DMA_ATTR_WEAK_ORDERING (1UL << 1) |
25 | /* |
26 | * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be |
27 | * buffered to improve performance. |
28 | */ |
29 | #define DMA_ATTR_WRITE_COMBINE (1UL << 2) |
30 | /* |
31 | * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel |
32 | * virtual mapping for the allocated buffer. |
33 | */ |
34 | #define DMA_ATTR_NO_KERNEL_MAPPING (1UL << 4) |
35 | /* |
36 | * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of |
37 | * the CPU cache for the given buffer assuming that it has been already |
38 | * transferred to 'device' domain. |
39 | */ |
40 | #define DMA_ATTR_SKIP_CPU_SYNC (1UL << 5) |
41 | /* |
42 | * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer |
43 | * in physical memory. |
44 | */ |
45 | #define DMA_ATTR_FORCE_CONTIGUOUS (1UL << 6) |
46 | /* |
47 | * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem |
48 | * that it's probably not worth the time to try to allocate memory to in a way |
49 | * that gives better TLB efficiency. |
50 | */ |
51 | #define DMA_ATTR_ALLOC_SINGLE_PAGES (1UL << 7) |
52 | /* |
53 | * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress |
54 | * allocation failure reports (similarly to __GFP_NOWARN). |
55 | */ |
56 | #define DMA_ATTR_NO_WARN (1UL << 8) |
57 | |
58 | /* |
59 | * DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully |
60 | * accessible at an elevated privilege level (and ideally inaccessible or |
61 | * at least read-only at lesser-privileged levels). |
62 | */ |
63 | #define DMA_ATTR_PRIVILEGED (1UL << 9) |
64 | |
65 | /* |
66 | * A dma_addr_t can hold any valid DMA or bus address for the platform. It can |
67 | * be given to a device to use as a DMA source or target. It is specific to a |
68 | * given device and there may be a translation between the CPU physical address |
69 | * space and the bus address space. |
70 | * |
71 | * DMA_MAPPING_ERROR is the magic error code if a mapping failed. It should not |
72 | * be used directly in drivers, but checked for using dma_mapping_error() |
73 | * instead. |
74 | */ |
75 | #define DMA_MAPPING_ERROR (~(dma_addr_t)0) |
76 | |
77 | #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) |
78 | |
79 | #ifdef CONFIG_DMA_API_DEBUG |
80 | void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); |
81 | void debug_dma_map_single(struct device *dev, const void *addr, |
82 | unsigned long len); |
83 | #else |
84 | static inline void debug_dma_mapping_error(struct device *dev, |
85 | dma_addr_t dma_addr) |
86 | { |
87 | } |
88 | static inline void debug_dma_map_single(struct device *dev, const void *addr, |
89 | unsigned long len) |
90 | { |
91 | } |
92 | #endif /* CONFIG_DMA_API_DEBUG */ |
93 | |
94 | #ifdef CONFIG_HAS_DMA |
95 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
96 | { |
97 | debug_dma_mapping_error(dev, dma_addr); |
98 | |
99 | if (unlikely(dma_addr == DMA_MAPPING_ERROR)) |
100 | return -ENOMEM; |
101 | return 0; |
102 | } |
103 | |
104 | dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page, |
105 | size_t offset, size_t size, enum dma_data_direction dir, |
106 | unsigned long attrs); |
107 | void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size, |
108 | enum dma_data_direction dir, unsigned long attrs); |
109 | unsigned int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, |
110 | int nents, enum dma_data_direction dir, unsigned long attrs); |
111 | void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, |
112 | int nents, enum dma_data_direction dir, |
113 | unsigned long attrs); |
114 | int dma_map_sgtable(struct device *dev, struct sg_table *sgt, |
115 | enum dma_data_direction dir, unsigned long attrs); |
116 | dma_addr_t dma_map_resource(struct device *dev, phys_addr_t phys_addr, |
117 | size_t size, enum dma_data_direction dir, unsigned long attrs); |
118 | void dma_unmap_resource(struct device *dev, dma_addr_t addr, size_t size, |
119 | enum dma_data_direction dir, unsigned long attrs); |
120 | void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, |
121 | enum dma_data_direction dir); |
122 | void dma_sync_single_for_device(struct device *dev, dma_addr_t addr, |
123 | size_t size, enum dma_data_direction dir); |
124 | void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
125 | int nelems, enum dma_data_direction dir); |
126 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
127 | int nelems, enum dma_data_direction dir); |
128 | void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, |
129 | gfp_t flag, unsigned long attrs); |
130 | void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, |
131 | dma_addr_t dma_handle, unsigned long attrs); |
132 | void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, |
133 | gfp_t gfp, unsigned long attrs); |
134 | void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, |
135 | dma_addr_t dma_handle); |
136 | int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, |
137 | void *cpu_addr, dma_addr_t dma_addr, size_t size, |
138 | unsigned long attrs); |
139 | int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, |
140 | void *cpu_addr, dma_addr_t dma_addr, size_t size, |
141 | unsigned long attrs); |
142 | bool dma_can_mmap(struct device *dev); |
143 | bool dma_pci_p2pdma_supported(struct device *dev); |
144 | int dma_set_mask(struct device *dev, u64 mask); |
145 | int dma_set_coherent_mask(struct device *dev, u64 mask); |
146 | u64 dma_get_required_mask(struct device *dev); |
147 | size_t dma_max_mapping_size(struct device *dev); |
148 | size_t dma_opt_mapping_size(struct device *dev); |
149 | bool dma_need_sync(struct device *dev, dma_addr_t dma_addr); |
150 | unsigned long dma_get_merge_boundary(struct device *dev); |
151 | struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size, |
152 | enum dma_data_direction dir, gfp_t gfp, unsigned long attrs); |
153 | void dma_free_noncontiguous(struct device *dev, size_t size, |
154 | struct sg_table *sgt, enum dma_data_direction dir); |
155 | void *dma_vmap_noncontiguous(struct device *dev, size_t size, |
156 | struct sg_table *sgt); |
157 | void dma_vunmap_noncontiguous(struct device *dev, void *vaddr); |
158 | int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma, |
159 | size_t size, struct sg_table *sgt); |
160 | #else /* CONFIG_HAS_DMA */ |
161 | static inline dma_addr_t dma_map_page_attrs(struct device *dev, |
162 | struct page *page, size_t offset, size_t size, |
163 | enum dma_data_direction dir, unsigned long attrs) |
164 | { |
165 | return DMA_MAPPING_ERROR; |
166 | } |
167 | static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, |
168 | size_t size, enum dma_data_direction dir, unsigned long attrs) |
169 | { |
170 | } |
171 | static inline unsigned int dma_map_sg_attrs(struct device *dev, |
172 | struct scatterlist *sg, int nents, enum dma_data_direction dir, |
173 | unsigned long attrs) |
174 | { |
175 | return 0; |
176 | } |
177 | static inline void dma_unmap_sg_attrs(struct device *dev, |
178 | struct scatterlist *sg, int nents, enum dma_data_direction dir, |
179 | unsigned long attrs) |
180 | { |
181 | } |
182 | static inline int dma_map_sgtable(struct device *dev, struct sg_table *sgt, |
183 | enum dma_data_direction dir, unsigned long attrs) |
184 | { |
185 | return -EOPNOTSUPP; |
186 | } |
187 | static inline dma_addr_t dma_map_resource(struct device *dev, |
188 | phys_addr_t phys_addr, size_t size, enum dma_data_direction dir, |
189 | unsigned long attrs) |
190 | { |
191 | return DMA_MAPPING_ERROR; |
192 | } |
193 | static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr, |
194 | size_t size, enum dma_data_direction dir, unsigned long attrs) |
195 | { |
196 | } |
197 | static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, |
198 | size_t size, enum dma_data_direction dir) |
199 | { |
200 | } |
201 | static inline void dma_sync_single_for_device(struct device *dev, |
202 | dma_addr_t addr, size_t size, enum dma_data_direction dir) |
203 | { |
204 | } |
205 | static inline void dma_sync_sg_for_cpu(struct device *dev, |
206 | struct scatterlist *sg, int nelems, enum dma_data_direction dir) |
207 | { |
208 | } |
209 | static inline void dma_sync_sg_for_device(struct device *dev, |
210 | struct scatterlist *sg, int nelems, enum dma_data_direction dir) |
211 | { |
212 | } |
213 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
214 | { |
215 | return -ENOMEM; |
216 | } |
217 | static inline void *dma_alloc_attrs(struct device *dev, size_t size, |
218 | dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs) |
219 | { |
220 | return NULL; |
221 | } |
222 | static void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, |
223 | dma_addr_t dma_handle, unsigned long attrs) |
224 | { |
225 | } |
226 | static inline void *dmam_alloc_attrs(struct device *dev, size_t size, |
227 | dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) |
228 | { |
229 | return NULL; |
230 | } |
231 | static inline void dmam_free_coherent(struct device *dev, size_t size, |
232 | void *vaddr, dma_addr_t dma_handle) |
233 | { |
234 | } |
235 | static inline int dma_get_sgtable_attrs(struct device *dev, |
236 | struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, |
237 | size_t size, unsigned long attrs) |
238 | { |
239 | return -ENXIO; |
240 | } |
241 | static inline int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, |
242 | void *cpu_addr, dma_addr_t dma_addr, size_t size, |
243 | unsigned long attrs) |
244 | { |
245 | return -ENXIO; |
246 | } |
247 | static inline bool dma_can_mmap(struct device *dev) |
248 | { |
249 | return false; |
250 | } |
251 | static inline bool dma_pci_p2pdma_supported(struct device *dev) |
252 | { |
253 | return false; |
254 | } |
255 | static inline int dma_set_mask(struct device *dev, u64 mask) |
256 | { |
257 | return -EIO; |
258 | } |
259 | static inline int dma_set_coherent_mask(struct device *dev, u64 mask) |
260 | { |
261 | return -EIO; |
262 | } |
263 | static inline u64 dma_get_required_mask(struct device *dev) |
264 | { |
265 | return 0; |
266 | } |
267 | static inline size_t dma_max_mapping_size(struct device *dev) |
268 | { |
269 | return 0; |
270 | } |
271 | static inline size_t dma_opt_mapping_size(struct device *dev) |
272 | { |
273 | return 0; |
274 | } |
275 | static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) |
276 | { |
277 | return false; |
278 | } |
279 | static inline unsigned long dma_get_merge_boundary(struct device *dev) |
280 | { |
281 | return 0; |
282 | } |
283 | static inline struct sg_table *dma_alloc_noncontiguous(struct device *dev, |
284 | size_t size, enum dma_data_direction dir, gfp_t gfp, |
285 | unsigned long attrs) |
286 | { |
287 | return NULL; |
288 | } |
289 | static inline void dma_free_noncontiguous(struct device *dev, size_t size, |
290 | struct sg_table *sgt, enum dma_data_direction dir) |
291 | { |
292 | } |
293 | static inline void *dma_vmap_noncontiguous(struct device *dev, size_t size, |
294 | struct sg_table *sgt) |
295 | { |
296 | return NULL; |
297 | } |
298 | static inline void dma_vunmap_noncontiguous(struct device *dev, void *vaddr) |
299 | { |
300 | } |
301 | static inline int dma_mmap_noncontiguous(struct device *dev, |
302 | struct vm_area_struct *vma, size_t size, struct sg_table *sgt) |
303 | { |
304 | return -EINVAL; |
305 | } |
306 | #endif /* CONFIG_HAS_DMA */ |
307 | |
308 | struct page *dma_alloc_pages(struct device *dev, size_t size, |
309 | dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp); |
310 | void dma_free_pages(struct device *dev, size_t size, struct page *page, |
311 | dma_addr_t dma_handle, enum dma_data_direction dir); |
312 | int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma, |
313 | size_t size, struct page *page); |
314 | |
315 | static inline void *dma_alloc_noncoherent(struct device *dev, size_t size, |
316 | dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) |
317 | { |
318 | struct page *page = dma_alloc_pages(dev, size, dma_handle, dir, gfp); |
319 | return page ? page_address(page) : NULL; |
320 | } |
321 | |
322 | static inline void dma_free_noncoherent(struct device *dev, size_t size, |
323 | void *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir) |
324 | { |
325 | dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir); |
326 | } |
327 | |
328 | static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr, |
329 | size_t size, enum dma_data_direction dir, unsigned long attrs) |
330 | { |
331 | /* DMA must never operate on areas that might be remapped. */ |
332 | if (dev_WARN_ONCE(dev, is_vmalloc_addr(ptr), |
333 | "rejecting DMA map of vmalloc memory\n" )) |
334 | return DMA_MAPPING_ERROR; |
335 | debug_dma_map_single(dev, addr: ptr, len: size); |
336 | return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr), |
337 | size, dir, attrs); |
338 | } |
339 | |
340 | static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, |
341 | size_t size, enum dma_data_direction dir, unsigned long attrs) |
342 | { |
343 | return dma_unmap_page_attrs(dev, addr, size, dir, attrs); |
344 | } |
345 | |
346 | static inline void dma_sync_single_range_for_cpu(struct device *dev, |
347 | dma_addr_t addr, unsigned long offset, size_t size, |
348 | enum dma_data_direction dir) |
349 | { |
350 | return dma_sync_single_for_cpu(dev, addr: addr + offset, size, dir); |
351 | } |
352 | |
353 | static inline void dma_sync_single_range_for_device(struct device *dev, |
354 | dma_addr_t addr, unsigned long offset, size_t size, |
355 | enum dma_data_direction dir) |
356 | { |
357 | return dma_sync_single_for_device(dev, addr: addr + offset, size, dir); |
358 | } |
359 | |
360 | /** |
361 | * dma_unmap_sgtable - Unmap the given buffer for DMA |
362 | * @dev: The device for which to perform the DMA operation |
363 | * @sgt: The sg_table object describing the buffer |
364 | * @dir: DMA direction |
365 | * @attrs: Optional DMA attributes for the unmap operation |
366 | * |
367 | * Unmaps a buffer described by a scatterlist stored in the given sg_table |
368 | * object for the @dir DMA operation by the @dev device. After this function |
369 | * the ownership of the buffer is transferred back to the CPU domain. |
370 | */ |
371 | static inline void dma_unmap_sgtable(struct device *dev, struct sg_table *sgt, |
372 | enum dma_data_direction dir, unsigned long attrs) |
373 | { |
374 | dma_unmap_sg_attrs(dev, sg: sgt->sgl, nents: sgt->orig_nents, dir, attrs); |
375 | } |
376 | |
377 | /** |
378 | * dma_sync_sgtable_for_cpu - Synchronize the given buffer for CPU access |
379 | * @dev: The device for which to perform the DMA operation |
380 | * @sgt: The sg_table object describing the buffer |
381 | * @dir: DMA direction |
382 | * |
383 | * Performs the needed cache synchronization and moves the ownership of the |
384 | * buffer back to the CPU domain, so it is safe to perform any access to it |
385 | * by the CPU. Before doing any further DMA operations, one has to transfer |
386 | * the ownership of the buffer back to the DMA domain by calling the |
387 | * dma_sync_sgtable_for_device(). |
388 | */ |
389 | static inline void dma_sync_sgtable_for_cpu(struct device *dev, |
390 | struct sg_table *sgt, enum dma_data_direction dir) |
391 | { |
392 | dma_sync_sg_for_cpu(dev, sg: sgt->sgl, nelems: sgt->orig_nents, dir); |
393 | } |
394 | |
395 | /** |
396 | * dma_sync_sgtable_for_device - Synchronize the given buffer for DMA |
397 | * @dev: The device for which to perform the DMA operation |
398 | * @sgt: The sg_table object describing the buffer |
399 | * @dir: DMA direction |
400 | * |
401 | * Performs the needed cache synchronization and moves the ownership of the |
402 | * buffer back to the DMA domain, so it is safe to perform the DMA operation. |
403 | * Once finished, one has to call dma_sync_sgtable_for_cpu() or |
404 | * dma_unmap_sgtable(). |
405 | */ |
406 | static inline void dma_sync_sgtable_for_device(struct device *dev, |
407 | struct sg_table *sgt, enum dma_data_direction dir) |
408 | { |
409 | dma_sync_sg_for_device(dev, sg: sgt->sgl, nelems: sgt->orig_nents, dir); |
410 | } |
411 | |
412 | #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0) |
413 | #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0) |
414 | #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0) |
415 | #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0) |
416 | #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0) |
417 | #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0) |
418 | #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0) |
419 | #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0) |
420 | |
421 | bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size); |
422 | |
423 | static inline void *dma_alloc_coherent(struct device *dev, size_t size, |
424 | dma_addr_t *dma_handle, gfp_t gfp) |
425 | { |
426 | return dma_alloc_attrs(dev, size, dma_handle, flag: gfp, |
427 | attrs: (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0); |
428 | } |
429 | |
430 | static inline void dma_free_coherent(struct device *dev, size_t size, |
431 | void *cpu_addr, dma_addr_t dma_handle) |
432 | { |
433 | return dma_free_attrs(dev, size, cpu_addr, dma_handle, attrs: 0); |
434 | } |
435 | |
436 | |
437 | static inline u64 dma_get_mask(struct device *dev) |
438 | { |
439 | if (dev->dma_mask && *dev->dma_mask) |
440 | return *dev->dma_mask; |
441 | return DMA_BIT_MASK(32); |
442 | } |
443 | |
444 | /* |
445 | * Set both the DMA mask and the coherent DMA mask to the same thing. |
446 | * Note that we don't check the return value from dma_set_coherent_mask() |
447 | * as the DMA API guarantees that the coherent DMA mask can be set to |
448 | * the same or smaller than the streaming DMA mask. |
449 | */ |
450 | static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask) |
451 | { |
452 | int rc = dma_set_mask(dev, mask); |
453 | if (rc == 0) |
454 | dma_set_coherent_mask(dev, mask); |
455 | return rc; |
456 | } |
457 | |
458 | /* |
459 | * Similar to the above, except it deals with the case where the device |
460 | * does not have dev->dma_mask appropriately setup. |
461 | */ |
462 | static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask) |
463 | { |
464 | dev->dma_mask = &dev->coherent_dma_mask; |
465 | return dma_set_mask_and_coherent(dev, mask); |
466 | } |
467 | |
468 | /** |
469 | * dma_addressing_limited - return if the device is addressing limited |
470 | * @dev: device to check |
471 | * |
472 | * Return %true if the devices DMA mask is too small to address all memory in |
473 | * the system, else %false. Lack of addressing bits is the prime reason for |
474 | * bounce buffering, but might not be the only one. |
475 | */ |
476 | static inline bool dma_addressing_limited(struct device *dev) |
477 | { |
478 | return min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) < |
479 | dma_get_required_mask(dev); |
480 | } |
481 | |
482 | static inline unsigned int dma_get_max_seg_size(struct device *dev) |
483 | { |
484 | if (dev->dma_parms && dev->dma_parms->max_segment_size) |
485 | return dev->dma_parms->max_segment_size; |
486 | return SZ_64K; |
487 | } |
488 | |
489 | static inline int dma_set_max_seg_size(struct device *dev, unsigned int size) |
490 | { |
491 | if (dev->dma_parms) { |
492 | dev->dma_parms->max_segment_size = size; |
493 | return 0; |
494 | } |
495 | return -EIO; |
496 | } |
497 | |
498 | static inline unsigned long dma_get_seg_boundary(struct device *dev) |
499 | { |
500 | if (dev->dma_parms && dev->dma_parms->segment_boundary_mask) |
501 | return dev->dma_parms->segment_boundary_mask; |
502 | return ULONG_MAX; |
503 | } |
504 | |
505 | /** |
506 | * dma_get_seg_boundary_nr_pages - return the segment boundary in "page" units |
507 | * @dev: device to guery the boundary for |
508 | * @page_shift: ilog() of the IOMMU page size |
509 | * |
510 | * Return the segment boundary in IOMMU page units (which may be different from |
511 | * the CPU page size) for the passed in device. |
512 | * |
513 | * If @dev is NULL a boundary of U32_MAX is assumed, this case is just for |
514 | * non-DMA API callers. |
515 | */ |
516 | static inline unsigned long dma_get_seg_boundary_nr_pages(struct device *dev, |
517 | unsigned int page_shift) |
518 | { |
519 | if (!dev) |
520 | return (U32_MAX >> page_shift) + 1; |
521 | return (dma_get_seg_boundary(dev) >> page_shift) + 1; |
522 | } |
523 | |
524 | static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) |
525 | { |
526 | if (dev->dma_parms) { |
527 | dev->dma_parms->segment_boundary_mask = mask; |
528 | return 0; |
529 | } |
530 | return -EIO; |
531 | } |
532 | |
533 | static inline unsigned int dma_get_min_align_mask(struct device *dev) |
534 | { |
535 | if (dev->dma_parms) |
536 | return dev->dma_parms->min_align_mask; |
537 | return 0; |
538 | } |
539 | |
540 | static inline int dma_set_min_align_mask(struct device *dev, |
541 | unsigned int min_align_mask) |
542 | { |
543 | if (WARN_ON_ONCE(!dev->dma_parms)) |
544 | return -EIO; |
545 | dev->dma_parms->min_align_mask = min_align_mask; |
546 | return 0; |
547 | } |
548 | |
549 | #ifndef dma_get_cache_alignment |
550 | static inline int dma_get_cache_alignment(void) |
551 | { |
552 | #ifdef ARCH_HAS_DMA_MINALIGN |
553 | return ARCH_DMA_MINALIGN; |
554 | #endif |
555 | return 1; |
556 | } |
557 | #endif |
558 | |
559 | static inline void *dmam_alloc_coherent(struct device *dev, size_t size, |
560 | dma_addr_t *dma_handle, gfp_t gfp) |
561 | { |
562 | return dmam_alloc_attrs(dev, size, dma_handle, gfp, |
563 | attrs: (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0); |
564 | } |
565 | |
566 | static inline void *dma_alloc_wc(struct device *dev, size_t size, |
567 | dma_addr_t *dma_addr, gfp_t gfp) |
568 | { |
569 | unsigned long attrs = DMA_ATTR_WRITE_COMBINE; |
570 | |
571 | if (gfp & __GFP_NOWARN) |
572 | attrs |= DMA_ATTR_NO_WARN; |
573 | |
574 | return dma_alloc_attrs(dev, size, dma_handle: dma_addr, flag: gfp, attrs); |
575 | } |
576 | |
577 | static inline void dma_free_wc(struct device *dev, size_t size, |
578 | void *cpu_addr, dma_addr_t dma_addr) |
579 | { |
580 | return dma_free_attrs(dev, size, cpu_addr, dma_handle: dma_addr, |
581 | DMA_ATTR_WRITE_COMBINE); |
582 | } |
583 | |
584 | static inline int dma_mmap_wc(struct device *dev, |
585 | struct vm_area_struct *vma, |
586 | void *cpu_addr, dma_addr_t dma_addr, |
587 | size_t size) |
588 | { |
589 | return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, |
590 | DMA_ATTR_WRITE_COMBINE); |
591 | } |
592 | |
593 | #ifdef CONFIG_NEED_DMA_MAP_STATE |
594 | #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME |
595 | #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME |
596 | #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME) |
597 | #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL)) |
598 | #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME) |
599 | #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL)) |
600 | #else |
601 | #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) |
602 | #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) |
603 | #define dma_unmap_addr(PTR, ADDR_NAME) (0) |
604 | #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0) |
605 | #define dma_unmap_len(PTR, LEN_NAME) (0) |
606 | #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) |
607 | #endif |
608 | |
609 | #endif /* _LINUX_DMA_MAPPING_H */ |
610 | |