1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_DMA_MAPPING_H
3 #define _LINUX_DMA_MAPPING_H
5 #include <linux/sizes.h>
6 #include <linux/string.h>
7 #include <linux/device.h>
9 #include <linux/dma-debug.h>
10 #include <linux/dma-direction.h>
11 #include <linux/scatterlist.h>
12 #include <linux/bug.h>
13 #include <linux/mem_encrypt.h>
16 * List of possible attributes associated with a DMA mapping. The semantics
17 * of each attribute should be defined in Documentation/DMA-attributes.txt.
19 * DMA_ATTR_WRITE_BARRIER: DMA to a memory region with this attribute
20 * forces all pending DMA writes to complete.
22 #define DMA_ATTR_WRITE_BARRIER (1UL << 0)
24 * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping
25 * may be weakly ordered, that is that reads and writes may pass each other.
27 #define DMA_ATTR_WEAK_ORDERING (1UL << 1)
29 * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be
30 * buffered to improve performance.
32 #define DMA_ATTR_WRITE_COMBINE (1UL << 2)
34 * DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either
35 * consistent or non-consistent memory as it sees fit.
37 #define DMA_ATTR_NON_CONSISTENT (1UL << 3)
39 * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
40 * virtual mapping for the allocated buffer.
42 #define DMA_ATTR_NO_KERNEL_MAPPING (1UL << 4)
44 * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of
45 * the CPU cache for the given buffer assuming that it has been already
46 * transferred to 'device' domain.
48 #define DMA_ATTR_SKIP_CPU_SYNC (1UL << 5)
50 * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer
53 #define DMA_ATTR_FORCE_CONTIGUOUS (1UL << 6)
55 * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem
56 * that it's probably not worth the time to try to allocate memory to in a way
57 * that gives better TLB efficiency.
59 #define DMA_ATTR_ALLOC_SINGLE_PAGES (1UL << 7)
61 * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress
62 * allocation failure reports (similarly to __GFP_NOWARN).
64 #define DMA_ATTR_NO_WARN (1UL << 8)
67 * DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully
68 * accessible at an elevated privilege level (and ideally inaccessible or
69 * at least read-only at lesser-privileged levels).
71 #define DMA_ATTR_PRIVILEGED (1UL << 9)
74 * A dma_addr_t can hold any valid DMA or bus address for the platform.
75 * It can be given to a device to use as a DMA source or target. A CPU cannot
76 * reference a dma_addr_t directly because there may be translation between
77 * its physical address space and the bus address space.
80 void* (*alloc)(struct device *dev, size_t size,
81 dma_addr_t *dma_handle, gfp_t gfp,
83 void (*free)(struct device *dev, size_t size,
84 void *vaddr, dma_addr_t dma_handle,
86 int (*mmap)(struct device *, struct vm_area_struct *,
87 void *, dma_addr_t, size_t,
90 int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
91 dma_addr_t, size_t, unsigned long attrs);
93 dma_addr_t (*map_page)(struct device *dev, struct page *page,
94 unsigned long offset, size_t size,
95 enum dma_data_direction dir,
97 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
98 size_t size, enum dma_data_direction dir,
101 * map_sg returns 0 on error and a value > 0 on success.
102 * It should never return a value < 0.
104 int (*map_sg)(struct device *dev, struct scatterlist *sg,
105 int nents, enum dma_data_direction dir,
106 unsigned long attrs);
107 void (*unmap_sg)(struct device *dev,
108 struct scatterlist *sg, int nents,
109 enum dma_data_direction dir,
110 unsigned long attrs);
111 dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
112 size_t size, enum dma_data_direction dir,
113 unsigned long attrs);
114 void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
115 size_t size, enum dma_data_direction dir,
116 unsigned long attrs);
117 void (*sync_single_for_cpu)(struct device *dev,
118 dma_addr_t dma_handle, size_t size,
119 enum dma_data_direction dir);
120 void (*sync_single_for_device)(struct device *dev,
121 dma_addr_t dma_handle, size_t size,
122 enum dma_data_direction dir);
123 void (*sync_sg_for_cpu)(struct device *dev,
124 struct scatterlist *sg, int nents,
125 enum dma_data_direction dir);
126 void (*sync_sg_for_device)(struct device *dev,
127 struct scatterlist *sg, int nents,
128 enum dma_data_direction dir);
129 void (*cache_sync)(struct device *dev, void *vaddr, size_t size,
130 enum dma_data_direction direction);
131 int (*dma_supported)(struct device *dev, u64 mask);
132 u64 (*get_required_mask)(struct device *dev);
135 #define DMA_MAPPING_ERROR (~(dma_addr_t)0)
137 extern const struct dma_map_ops dma_virt_ops;
138 extern const struct dma_map_ops dma_dummy_ops;
140 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
142 #define DMA_MASK_NONE 0x0ULL
144 static inline int valid_dma_direction(int dma_direction)
146 return ((dma_direction == DMA_BIDIRECTIONAL) ||
147 (dma_direction == DMA_TO_DEVICE) ||
148 (dma_direction == DMA_FROM_DEVICE));
151 static inline int is_device_dma_capable(struct device *dev)
153 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
156 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
158 * These three functions are only for dma allocator.
159 * Don't use them in device drivers.
161 int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
162 dma_addr_t *dma_handle, void **ret);
163 int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
165 int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
166 void *cpu_addr, size_t size, int *ret);
168 void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle);
169 int dma_release_from_global_coherent(int order, void *vaddr);
170 int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
171 size_t size, int *ret);
174 #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
175 #define dma_release_from_dev_coherent(dev, order, vaddr) (0)
176 #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
178 static inline void *dma_alloc_from_global_coherent(ssize_t size,
179 dma_addr_t *dma_handle)
184 static inline int dma_release_from_global_coherent(int order, void *vaddr)
189 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
190 void *cpu_addr, size_t size,
195 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
197 #ifdef CONFIG_HAS_DMA
198 #include <asm/dma-mapping.h>
199 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
201 if (dev && dev->dma_ops)
203 return get_arch_dma_ops(dev ? dev->bus : NULL);
206 static inline void set_dma_ops(struct device *dev,
207 const struct dma_map_ops *dma_ops)
209 dev->dma_ops = dma_ops;
213 * Define the dma api to allow compilation of dma dependent code.
214 * Code that depends on the dma-mapping API needs to set 'depends on HAS_DMA'
215 * in its Kconfig, unless it already depends on <something> || COMPILE_TEST,
216 * where <something> guarantuees the availability of the dma-mapping API.
218 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
224 static inline bool dma_is_direct(const struct dma_map_ops *ops)
230 * All the dma_direct_* declarations are here just for the indirect call bypass,
231 * and must not be used directly drivers!
233 dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
234 unsigned long offset, size_t size, enum dma_data_direction dir,
235 unsigned long attrs);
236 int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
237 enum dma_data_direction dir, unsigned long attrs);
239 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
240 defined(CONFIG_SWIOTLB)
241 void dma_direct_sync_single_for_device(struct device *dev,
242 dma_addr_t addr, size_t size, enum dma_data_direction dir);
243 void dma_direct_sync_sg_for_device(struct device *dev,
244 struct scatterlist *sgl, int nents, enum dma_data_direction dir);
246 static inline void dma_direct_sync_single_for_device(struct device *dev,
247 dma_addr_t addr, size_t size, enum dma_data_direction dir)
250 static inline void dma_direct_sync_sg_for_device(struct device *dev,
251 struct scatterlist *sgl, int nents, enum dma_data_direction dir)
256 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
257 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \
258 defined(CONFIG_SWIOTLB)
259 void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
260 size_t size, enum dma_data_direction dir, unsigned long attrs);
261 void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl,
262 int nents, enum dma_data_direction dir, unsigned long attrs);
263 void dma_direct_sync_single_for_cpu(struct device *dev,
264 dma_addr_t addr, size_t size, enum dma_data_direction dir);
265 void dma_direct_sync_sg_for_cpu(struct device *dev,
266 struct scatterlist *sgl, int nents, enum dma_data_direction dir);
268 static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
269 size_t size, enum dma_data_direction dir, unsigned long attrs)
272 static inline void dma_direct_unmap_sg(struct device *dev,
273 struct scatterlist *sgl, int nents, enum dma_data_direction dir,
277 static inline void dma_direct_sync_single_for_cpu(struct device *dev,
278 dma_addr_t addr, size_t size, enum dma_data_direction dir)
281 static inline void dma_direct_sync_sg_for_cpu(struct device *dev,
282 struct scatterlist *sgl, int nents, enum dma_data_direction dir)
287 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
288 struct page *page, size_t offset, size_t size,
289 enum dma_data_direction dir, unsigned long attrs)
291 const struct dma_map_ops *ops = get_dma_ops(dev);
294 BUG_ON(!valid_dma_direction(dir));
295 if (dma_is_direct(ops))
296 addr = dma_direct_map_page(dev, page, offset, size, dir, attrs);
298 addr = ops->map_page(dev, page, offset, size, dir, attrs);
299 debug_dma_map_page(dev, page, offset, size, dir, addr);
304 static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr,
305 size_t size, enum dma_data_direction dir, unsigned long attrs)
307 const struct dma_map_ops *ops = get_dma_ops(dev);
309 BUG_ON(!valid_dma_direction(dir));
310 if (dma_is_direct(ops))
311 dma_direct_unmap_page(dev, addr, size, dir, attrs);
312 else if (ops->unmap_page)
313 ops->unmap_page(dev, addr, size, dir, attrs);
314 debug_dma_unmap_page(dev, addr, size, dir);
318 * dma_maps_sg_attrs returns 0 on error and > 0 on success.
319 * It should never return a value < 0.
321 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
322 int nents, enum dma_data_direction dir,
325 const struct dma_map_ops *ops = get_dma_ops(dev);
328 BUG_ON(!valid_dma_direction(dir));
329 if (dma_is_direct(ops))
330 ents = dma_direct_map_sg(dev, sg, nents, dir, attrs);
332 ents = ops->map_sg(dev, sg, nents, dir, attrs);
334 debug_dma_map_sg(dev, sg, nents, ents, dir);
339 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
340 int nents, enum dma_data_direction dir,
343 const struct dma_map_ops *ops = get_dma_ops(dev);
345 BUG_ON(!valid_dma_direction(dir));
346 debug_dma_unmap_sg(dev, sg, nents, dir);
347 if (dma_is_direct(ops))
348 dma_direct_unmap_sg(dev, sg, nents, dir, attrs);
349 else if (ops->unmap_sg)
350 ops->unmap_sg(dev, sg, nents, dir, attrs);
353 static inline dma_addr_t dma_map_resource(struct device *dev,
354 phys_addr_t phys_addr,
356 enum dma_data_direction dir,
359 const struct dma_map_ops *ops = get_dma_ops(dev);
362 BUG_ON(!valid_dma_direction(dir));
364 /* Don't allow RAM to be mapped */
365 BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
368 if (ops && ops->map_resource)
369 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
371 debug_dma_map_resource(dev, phys_addr, size, dir, addr);
376 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
377 size_t size, enum dma_data_direction dir,
380 const struct dma_map_ops *ops = get_dma_ops(dev);
382 BUG_ON(!valid_dma_direction(dir));
383 if (ops && ops->unmap_resource)
384 ops->unmap_resource(dev, addr, size, dir, attrs);
385 debug_dma_unmap_resource(dev, addr, size, dir);
388 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
390 enum dma_data_direction dir)
392 const struct dma_map_ops *ops = get_dma_ops(dev);
394 BUG_ON(!valid_dma_direction(dir));
395 if (dma_is_direct(ops))
396 dma_direct_sync_single_for_cpu(dev, addr, size, dir);
397 else if (ops->sync_single_for_cpu)
398 ops->sync_single_for_cpu(dev, addr, size, dir);
399 debug_dma_sync_single_for_cpu(dev, addr, size, dir);
402 static inline void dma_sync_single_range_for_cpu(struct device *dev,
403 dma_addr_t addr, unsigned long offset, size_t size,
404 enum dma_data_direction dir)
406 return dma_sync_single_for_cpu(dev, addr + offset, size, dir);
409 static inline void dma_sync_single_for_device(struct device *dev,
410 dma_addr_t addr, size_t size,
411 enum dma_data_direction dir)
413 const struct dma_map_ops *ops = get_dma_ops(dev);
415 BUG_ON(!valid_dma_direction(dir));
416 if (dma_is_direct(ops))
417 dma_direct_sync_single_for_device(dev, addr, size, dir);
418 else if (ops->sync_single_for_device)
419 ops->sync_single_for_device(dev, addr, size, dir);
420 debug_dma_sync_single_for_device(dev, addr, size, dir);
423 static inline void dma_sync_single_range_for_device(struct device *dev,
424 dma_addr_t addr, unsigned long offset, size_t size,
425 enum dma_data_direction dir)
427 return dma_sync_single_for_device(dev, addr + offset, size, dir);
431 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
432 int nelems, enum dma_data_direction dir)
434 const struct dma_map_ops *ops = get_dma_ops(dev);
436 BUG_ON(!valid_dma_direction(dir));
437 if (dma_is_direct(ops))
438 dma_direct_sync_sg_for_cpu(dev, sg, nelems, dir);
439 else if (ops->sync_sg_for_cpu)
440 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
441 debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
445 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
446 int nelems, enum dma_data_direction dir)
448 const struct dma_map_ops *ops = get_dma_ops(dev);
450 BUG_ON(!valid_dma_direction(dir));
451 if (dma_is_direct(ops))
452 dma_direct_sync_sg_for_device(dev, sg, nelems, dir);
453 else if (ops->sync_sg_for_device)
454 ops->sync_sg_for_device(dev, sg, nelems, dir);
455 debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
459 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
460 size_t size, enum dma_data_direction dir, unsigned long attrs)
462 debug_dma_map_single(dev, ptr, size);
463 return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr),
467 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
468 size_t size, enum dma_data_direction dir, unsigned long attrs)
470 return dma_unmap_page_attrs(dev, addr, size, dir, attrs);
473 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
474 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
475 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
476 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
477 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
478 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
480 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
481 enum dma_data_direction dir);
483 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
484 void *cpu_addr, dma_addr_t dma_addr, size_t size,
485 unsigned long attrs);
487 void *dma_common_contiguous_remap(struct page *page, size_t size,
488 unsigned long vm_flags,
489 pgprot_t prot, const void *caller);
491 void *dma_common_pages_remap(struct page **pages, size_t size,
492 unsigned long vm_flags, pgprot_t prot,
494 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
496 int __init dma_atomic_pool_init(gfp_t gfp, pgprot_t prot);
497 bool dma_in_atomic_pool(void *start, size_t size);
498 void *dma_alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags);
499 bool dma_free_from_pool(void *start, size_t size);
501 int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
502 void *cpu_addr, dma_addr_t dma_addr, size_t size,
503 unsigned long attrs);
504 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
507 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr,
508 dma_addr_t dma_addr, size_t size, unsigned long attrs);
510 int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt,
511 void *cpu_addr, dma_addr_t dma_addr, size_t size,
512 unsigned long attrs);
513 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
515 void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
516 gfp_t flag, unsigned long attrs);
517 void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
518 dma_addr_t dma_handle, unsigned long attrs);
520 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
521 dma_addr_t *dma_handle, gfp_t gfp)
524 return dma_alloc_attrs(dev, size, dma_handle, gfp,
525 (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0);
528 static inline void dma_free_coherent(struct device *dev, size_t size,
529 void *cpu_addr, dma_addr_t dma_handle)
531 return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
534 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
536 debug_dma_mapping_error(dev, dma_addr);
538 if (dma_addr == DMA_MAPPING_ERROR)
543 int dma_supported(struct device *dev, u64 mask);
544 int dma_set_mask(struct device *dev, u64 mask);
545 int dma_set_coherent_mask(struct device *dev, u64 mask);
547 static inline u64 dma_get_mask(struct device *dev)
549 if (dev && dev->dma_mask && *dev->dma_mask)
550 return *dev->dma_mask;
551 return DMA_BIT_MASK(32);
555 * Set both the DMA mask and the coherent DMA mask to the same thing.
556 * Note that we don't check the return value from dma_set_coherent_mask()
557 * as the DMA API guarantees that the coherent DMA mask can be set to
558 * the same or smaller than the streaming DMA mask.
560 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
562 int rc = dma_set_mask(dev, mask);
564 dma_set_coherent_mask(dev, mask);
569 * Similar to the above, except it deals with the case where the device
570 * does not have dev->dma_mask appropriately setup.
572 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
574 dev->dma_mask = &dev->coherent_dma_mask;
575 return dma_set_mask_and_coherent(dev, mask);
578 extern u64 dma_get_required_mask(struct device *dev);
580 #ifndef arch_setup_dma_ops
581 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
582 u64 size, const struct iommu_ops *iommu,
586 #ifndef arch_teardown_dma_ops
587 static inline void arch_teardown_dma_ops(struct device *dev) { }
590 static inline unsigned int dma_get_max_seg_size(struct device *dev)
592 if (dev->dma_parms && dev->dma_parms->max_segment_size)
593 return dev->dma_parms->max_segment_size;
597 static inline int dma_set_max_seg_size(struct device *dev, unsigned int size)
599 if (dev->dma_parms) {
600 dev->dma_parms->max_segment_size = size;
606 static inline unsigned long dma_get_seg_boundary(struct device *dev)
608 if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
609 return dev->dma_parms->segment_boundary_mask;
610 return DMA_BIT_MASK(32);
613 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
615 if (dev->dma_parms) {
616 dev->dma_parms->segment_boundary_mask = mask;
623 static inline unsigned long dma_max_pfn(struct device *dev)
625 return (*dev->dma_mask >> PAGE_SHIFT) + dev->dma_pfn_offset;
630 * Please always use dma_alloc_coherent instead as it already zeroes the memory!
632 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
633 dma_addr_t *dma_handle, gfp_t flag)
635 return dma_alloc_coherent(dev, size, dma_handle, flag);
638 static inline int dma_get_cache_alignment(void)
640 #ifdef ARCH_DMA_MINALIGN
641 return ARCH_DMA_MINALIGN;
646 /* flags for the coherent memory api */
647 #define DMA_MEMORY_EXCLUSIVE 0x01
649 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
650 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
651 dma_addr_t device_addr, size_t size, int flags);
652 void dma_release_declared_memory(struct device *dev);
653 void *dma_mark_declared_memory_occupied(struct device *dev,
654 dma_addr_t device_addr, size_t size);
657 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
658 dma_addr_t device_addr, size_t size, int flags)
664 dma_release_declared_memory(struct device *dev)
669 dma_mark_declared_memory_occupied(struct device *dev,
670 dma_addr_t device_addr, size_t size)
672 return ERR_PTR(-EBUSY);
674 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
679 #ifdef CONFIG_HAS_DMA
680 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
681 dma_addr_t *dma_handle, gfp_t gfp);
682 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
683 dma_addr_t dma_handle);
684 #else /* !CONFIG_HAS_DMA */
685 static inline void *dmam_alloc_coherent(struct device *dev, size_t size,
686 dma_addr_t *dma_handle, gfp_t gfp)
688 static inline void dmam_free_coherent(struct device *dev, size_t size,
689 void *vaddr, dma_addr_t dma_handle) { }
690 #endif /* !CONFIG_HAS_DMA */
692 extern void *dmam_alloc_attrs(struct device *dev, size_t size,
693 dma_addr_t *dma_handle, gfp_t gfp,
694 unsigned long attrs);
695 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
696 extern int dmam_declare_coherent_memory(struct device *dev,
697 phys_addr_t phys_addr,
698 dma_addr_t device_addr, size_t size,
700 extern void dmam_release_declared_memory(struct device *dev);
701 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
702 static inline int dmam_declare_coherent_memory(struct device *dev,
703 phys_addr_t phys_addr, dma_addr_t device_addr,
704 size_t size, gfp_t gfp)
709 static inline void dmam_release_declared_memory(struct device *dev)
712 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
714 static inline void *dma_alloc_wc(struct device *dev, size_t size,
715 dma_addr_t *dma_addr, gfp_t gfp)
717 unsigned long attrs = DMA_ATTR_WRITE_COMBINE;
719 if (gfp & __GFP_NOWARN)
720 attrs |= DMA_ATTR_NO_WARN;
722 return dma_alloc_attrs(dev, size, dma_addr, gfp, attrs);
724 #ifndef dma_alloc_writecombine
725 #define dma_alloc_writecombine dma_alloc_wc
728 static inline void dma_free_wc(struct device *dev, size_t size,
729 void *cpu_addr, dma_addr_t dma_addr)
731 return dma_free_attrs(dev, size, cpu_addr, dma_addr,
732 DMA_ATTR_WRITE_COMBINE);
734 #ifndef dma_free_writecombine
735 #define dma_free_writecombine dma_free_wc
738 static inline int dma_mmap_wc(struct device *dev,
739 struct vm_area_struct *vma,
740 void *cpu_addr, dma_addr_t dma_addr,
743 return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
744 DMA_ATTR_WRITE_COMBINE);
746 #ifndef dma_mmap_writecombine
747 #define dma_mmap_writecombine dma_mmap_wc
750 #ifdef CONFIG_NEED_DMA_MAP_STATE
751 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
752 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
753 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
754 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
755 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
756 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
758 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
759 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
760 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
761 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
762 #define dma_unmap_len(PTR, LEN_NAME) (0)
763 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)