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