1 #ifndef _LINUX_DMA_MAPPING_H
2 #define _LINUX_DMA_MAPPING_H
4 #include <linux/sizes.h>
5 #include <linux/string.h>
6 #include <linux/device.h>
8 #include <linux/dma-debug.h>
9 #include <linux/dma-direction.h>
10 #include <linux/scatterlist.h>
11 #include <linux/kmemcheck.h>
12 #include <linux/bug.h>
15 * List of possible attributes associated with a DMA mapping. The semantics
16 * of each attribute should be defined in Documentation/DMA-attributes.txt.
18 * DMA_ATTR_WRITE_BARRIER: DMA to a memory region with this attribute
19 * forces all pending DMA writes to complete.
21 #define DMA_ATTR_WRITE_BARRIER (1UL << 0)
23 * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping
24 * may be weakly ordered, that is that reads and writes may pass each other.
26 #define DMA_ATTR_WEAK_ORDERING (1UL << 1)
28 * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be
29 * buffered to improve performance.
31 #define DMA_ATTR_WRITE_COMBINE (1UL << 2)
33 * DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either
34 * consistent or non-consistent memory as it sees fit.
36 #define DMA_ATTR_NON_CONSISTENT (1UL << 3)
38 * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
39 * virtual mapping for the allocated buffer.
41 #define DMA_ATTR_NO_KERNEL_MAPPING (1UL << 4)
43 * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of
44 * the CPU cache for the given buffer assuming that it has been already
45 * transferred to 'device' domain.
47 #define DMA_ATTR_SKIP_CPU_SYNC (1UL << 5)
49 * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer
52 #define DMA_ATTR_FORCE_CONTIGUOUS (1UL << 6)
54 * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem
55 * that it's probably not worth the time to try to allocate memory to in a way
56 * that gives better TLB efficiency.
58 #define DMA_ATTR_ALLOC_SINGLE_PAGES (1UL << 7)
60 * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress
61 * allocation failure reports (similarly to __GFP_NOWARN).
63 #define DMA_ATTR_NO_WARN (1UL << 8)
66 * A dma_addr_t can hold any valid DMA or bus address for the platform.
67 * It can be given to a device to use as a DMA source or target. A CPU cannot
68 * reference a dma_addr_t directly because there may be translation between
69 * its physical address space and the bus address space.
72 void* (*alloc)(struct device *dev, size_t size,
73 dma_addr_t *dma_handle, gfp_t gfp,
75 void (*free)(struct device *dev, size_t size,
76 void *vaddr, dma_addr_t dma_handle,
78 int (*mmap)(struct device *, struct vm_area_struct *,
79 void *, dma_addr_t, size_t,
82 int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
83 dma_addr_t, size_t, unsigned long attrs);
85 dma_addr_t (*map_page)(struct device *dev, struct page *page,
86 unsigned long offset, size_t size,
87 enum dma_data_direction dir,
89 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
90 size_t size, enum dma_data_direction dir,
93 * map_sg returns 0 on error and a value > 0 on success.
94 * It should never return a value < 0.
96 int (*map_sg)(struct device *dev, struct scatterlist *sg,
97 int nents, enum dma_data_direction dir,
99 void (*unmap_sg)(struct device *dev,
100 struct scatterlist *sg, int nents,
101 enum dma_data_direction dir,
102 unsigned long attrs);
103 dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
104 size_t size, enum dma_data_direction dir,
105 unsigned long attrs);
106 void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
107 size_t size, enum dma_data_direction dir,
108 unsigned long attrs);
109 void (*sync_single_for_cpu)(struct device *dev,
110 dma_addr_t dma_handle, size_t size,
111 enum dma_data_direction dir);
112 void (*sync_single_for_device)(struct device *dev,
113 dma_addr_t dma_handle, size_t size,
114 enum dma_data_direction dir);
115 void (*sync_sg_for_cpu)(struct device *dev,
116 struct scatterlist *sg, int nents,
117 enum dma_data_direction dir);
118 void (*sync_sg_for_device)(struct device *dev,
119 struct scatterlist *sg, int nents,
120 enum dma_data_direction dir);
121 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
122 int (*dma_supported)(struct device *dev, u64 mask);
123 int (*set_dma_mask)(struct device *dev, u64 mask);
124 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
125 u64 (*get_required_mask)(struct device *dev);
130 extern struct dma_map_ops dma_noop_ops;
132 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
134 #define DMA_MASK_NONE 0x0ULL
136 static inline int valid_dma_direction(int dma_direction)
138 return ((dma_direction == DMA_BIDIRECTIONAL) ||
139 (dma_direction == DMA_TO_DEVICE) ||
140 (dma_direction == DMA_FROM_DEVICE));
143 static inline int is_device_dma_capable(struct device *dev)
145 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
148 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
150 * These three functions are only for dma allocator.
151 * Don't use them in device drivers.
153 int dma_alloc_from_coherent(struct device *dev, ssize_t size,
154 dma_addr_t *dma_handle, void **ret);
155 int dma_release_from_coherent(struct device *dev, int order, void *vaddr);
157 int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
158 void *cpu_addr, size_t size, int *ret);
160 #define dma_alloc_from_coherent(dev, size, handle, ret) (0)
161 #define dma_release_from_coherent(dev, order, vaddr) (0)
162 #define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
163 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
165 #ifdef CONFIG_HAS_DMA
166 #include <asm/dma-mapping.h>
169 * Define the dma api to allow compilation but not linking of
170 * dma dependent code. Code that depends on the dma-mapping
171 * API needs to set 'depends on HAS_DMA' in its Kconfig
173 extern struct dma_map_ops bad_dma_ops;
174 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
180 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
182 enum dma_data_direction dir,
185 struct dma_map_ops *ops = get_dma_ops(dev);
188 kmemcheck_mark_initialized(ptr, size);
189 BUG_ON(!valid_dma_direction(dir));
190 addr = ops->map_page(dev, virt_to_page(ptr),
191 offset_in_page(ptr), size,
193 debug_dma_map_page(dev, virt_to_page(ptr),
194 offset_in_page(ptr), size,
199 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
201 enum dma_data_direction dir,
204 struct dma_map_ops *ops = get_dma_ops(dev);
206 BUG_ON(!valid_dma_direction(dir));
208 ops->unmap_page(dev, addr, size, dir, attrs);
209 debug_dma_unmap_page(dev, addr, size, dir, true);
213 * dma_maps_sg_attrs returns 0 on error and > 0 on success.
214 * It should never return a value < 0.
216 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
217 int nents, enum dma_data_direction dir,
220 struct dma_map_ops *ops = get_dma_ops(dev);
222 struct scatterlist *s;
224 for_each_sg(sg, s, nents, i)
225 kmemcheck_mark_initialized(sg_virt(s), s->length);
226 BUG_ON(!valid_dma_direction(dir));
227 ents = ops->map_sg(dev, sg, nents, dir, attrs);
229 debug_dma_map_sg(dev, sg, nents, ents, dir);
234 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
235 int nents, enum dma_data_direction dir,
238 struct dma_map_ops *ops = get_dma_ops(dev);
240 BUG_ON(!valid_dma_direction(dir));
241 debug_dma_unmap_sg(dev, sg, nents, dir);
243 ops->unmap_sg(dev, sg, nents, dir, attrs);
246 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
248 size_t offset, size_t size,
249 enum dma_data_direction dir,
252 struct dma_map_ops *ops = get_dma_ops(dev);
255 kmemcheck_mark_initialized(page_address(page) + offset, size);
256 BUG_ON(!valid_dma_direction(dir));
257 addr = ops->map_page(dev, page, offset, size, dir, attrs);
258 debug_dma_map_page(dev, page, offset, size, dir, addr, false);
263 static inline void dma_unmap_page_attrs(struct device *dev,
264 dma_addr_t addr, size_t size,
265 enum dma_data_direction dir,
268 struct dma_map_ops *ops = get_dma_ops(dev);
270 BUG_ON(!valid_dma_direction(dir));
272 ops->unmap_page(dev, addr, size, dir, attrs);
273 debug_dma_unmap_page(dev, addr, size, dir, false);
276 static inline dma_addr_t dma_map_resource(struct device *dev,
277 phys_addr_t phys_addr,
279 enum dma_data_direction dir,
282 struct dma_map_ops *ops = get_dma_ops(dev);
285 BUG_ON(!valid_dma_direction(dir));
287 /* Don't allow RAM to be mapped */
288 BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
291 if (ops->map_resource)
292 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
294 debug_dma_map_resource(dev, phys_addr, size, dir, addr);
299 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
300 size_t size, enum dma_data_direction dir,
303 struct dma_map_ops *ops = get_dma_ops(dev);
305 BUG_ON(!valid_dma_direction(dir));
306 if (ops->unmap_resource)
307 ops->unmap_resource(dev, addr, size, dir, attrs);
308 debug_dma_unmap_resource(dev, addr, size, dir);
311 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
313 enum dma_data_direction dir)
315 struct dma_map_ops *ops = get_dma_ops(dev);
317 BUG_ON(!valid_dma_direction(dir));
318 if (ops->sync_single_for_cpu)
319 ops->sync_single_for_cpu(dev, addr, size, dir);
320 debug_dma_sync_single_for_cpu(dev, addr, size, dir);
323 static inline void dma_sync_single_for_device(struct device *dev,
324 dma_addr_t addr, size_t size,
325 enum dma_data_direction dir)
327 struct dma_map_ops *ops = get_dma_ops(dev);
329 BUG_ON(!valid_dma_direction(dir));
330 if (ops->sync_single_for_device)
331 ops->sync_single_for_device(dev, addr, size, dir);
332 debug_dma_sync_single_for_device(dev, addr, size, dir);
335 static inline void dma_sync_single_range_for_cpu(struct device *dev,
337 unsigned long offset,
339 enum dma_data_direction dir)
341 const struct dma_map_ops *ops = get_dma_ops(dev);
343 BUG_ON(!valid_dma_direction(dir));
344 if (ops->sync_single_for_cpu)
345 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
346 debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
349 static inline void dma_sync_single_range_for_device(struct device *dev,
351 unsigned long offset,
353 enum dma_data_direction dir)
355 const struct dma_map_ops *ops = get_dma_ops(dev);
357 BUG_ON(!valid_dma_direction(dir));
358 if (ops->sync_single_for_device)
359 ops->sync_single_for_device(dev, addr + offset, size, dir);
360 debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
364 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
365 int nelems, enum dma_data_direction dir)
367 struct dma_map_ops *ops = get_dma_ops(dev);
369 BUG_ON(!valid_dma_direction(dir));
370 if (ops->sync_sg_for_cpu)
371 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
372 debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
376 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
377 int nelems, enum dma_data_direction dir)
379 struct dma_map_ops *ops = get_dma_ops(dev);
381 BUG_ON(!valid_dma_direction(dir));
382 if (ops->sync_sg_for_device)
383 ops->sync_sg_for_device(dev, sg, nelems, dir);
384 debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
388 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
389 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
390 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
391 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
392 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
393 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
395 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
396 void *cpu_addr, dma_addr_t dma_addr, size_t size);
398 void *dma_common_contiguous_remap(struct page *page, size_t size,
399 unsigned long vm_flags,
400 pgprot_t prot, const void *caller);
402 void *dma_common_pages_remap(struct page **pages, size_t size,
403 unsigned long vm_flags, pgprot_t prot,
405 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
408 * dma_mmap_attrs - map a coherent DMA allocation into user space
409 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
410 * @vma: vm_area_struct describing requested user mapping
411 * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
412 * @handle: device-view address returned from dma_alloc_attrs
413 * @size: size of memory originally requested in dma_alloc_attrs
414 * @attrs: attributes of mapping properties requested in dma_alloc_attrs
416 * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
417 * into user space. The coherent DMA buffer must not be freed by the
418 * driver until the user space mapping has been released.
421 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
422 dma_addr_t dma_addr, size_t size, unsigned long attrs)
424 struct dma_map_ops *ops = get_dma_ops(dev);
427 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
428 return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
431 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
434 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
435 void *cpu_addr, dma_addr_t dma_addr, size_t size);
438 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
439 dma_addr_t dma_addr, size_t size,
442 struct dma_map_ops *ops = get_dma_ops(dev);
444 if (ops->get_sgtable)
445 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
447 return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
450 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
452 #ifndef arch_dma_alloc_attrs
453 #define arch_dma_alloc_attrs(dev, flag) (true)
456 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
457 dma_addr_t *dma_handle, gfp_t flag,
460 struct dma_map_ops *ops = get_dma_ops(dev);
465 if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr))
468 if (!arch_dma_alloc_attrs(&dev, &flag))
473 cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
474 debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
478 static inline void dma_free_attrs(struct device *dev, size_t size,
479 void *cpu_addr, dma_addr_t dma_handle,
482 struct dma_map_ops *ops = get_dma_ops(dev);
485 WARN_ON(irqs_disabled());
487 if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
490 if (!ops->free || !cpu_addr)
493 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
494 ops->free(dev, size, cpu_addr, dma_handle, attrs);
497 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
498 dma_addr_t *dma_handle, gfp_t flag)
500 return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
503 static inline void dma_free_coherent(struct device *dev, size_t size,
504 void *cpu_addr, dma_addr_t dma_handle)
506 return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
509 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
510 dma_addr_t *dma_handle, gfp_t gfp)
512 return dma_alloc_attrs(dev, size, dma_handle, gfp,
513 DMA_ATTR_NON_CONSISTENT);
516 static inline void dma_free_noncoherent(struct device *dev, size_t size,
517 void *cpu_addr, dma_addr_t dma_handle)
519 dma_free_attrs(dev, size, cpu_addr, dma_handle,
520 DMA_ATTR_NON_CONSISTENT);
523 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
525 debug_dma_mapping_error(dev, dma_addr);
527 if (get_dma_ops(dev)->mapping_error)
528 return get_dma_ops(dev)->mapping_error(dev, dma_addr);
530 #ifdef DMA_ERROR_CODE
531 return dma_addr == DMA_ERROR_CODE;
537 #ifndef HAVE_ARCH_DMA_SUPPORTED
538 static inline int dma_supported(struct device *dev, u64 mask)
540 struct dma_map_ops *ops = get_dma_ops(dev);
544 if (!ops->dma_supported)
546 return ops->dma_supported(dev, mask);
550 #ifndef HAVE_ARCH_DMA_SET_MASK
551 static inline int dma_set_mask(struct device *dev, u64 mask)
553 struct dma_map_ops *ops = get_dma_ops(dev);
555 if (ops->set_dma_mask)
556 return ops->set_dma_mask(dev, mask);
558 if (!dev->dma_mask || !dma_supported(dev, mask))
560 *dev->dma_mask = mask;
565 static inline u64 dma_get_mask(struct device *dev)
567 if (dev && dev->dma_mask && *dev->dma_mask)
568 return *dev->dma_mask;
569 return DMA_BIT_MASK(32);
572 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
573 int dma_set_coherent_mask(struct device *dev, u64 mask);
575 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
577 if (!dma_supported(dev, mask))
579 dev->coherent_dma_mask = mask;
585 * Set both the DMA mask and the coherent DMA mask to the same thing.
586 * Note that we don't check the return value from dma_set_coherent_mask()
587 * as the DMA API guarantees that the coherent DMA mask can be set to
588 * the same or smaller than the streaming DMA mask.
590 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
592 int rc = dma_set_mask(dev, mask);
594 dma_set_coherent_mask(dev, mask);
599 * Similar to the above, except it deals with the case where the device
600 * does not have dev->dma_mask appropriately setup.
602 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
604 dev->dma_mask = &dev->coherent_dma_mask;
605 return dma_set_mask_and_coherent(dev, mask);
608 extern u64 dma_get_required_mask(struct device *dev);
610 #ifndef arch_setup_dma_ops
611 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
612 u64 size, const struct iommu_ops *iommu,
616 #ifndef arch_teardown_dma_ops
617 static inline void arch_teardown_dma_ops(struct device *dev) { }
620 static inline unsigned int dma_get_max_seg_size(struct device *dev)
622 if (dev->dma_parms && dev->dma_parms->max_segment_size)
623 return dev->dma_parms->max_segment_size;
627 static inline unsigned int dma_set_max_seg_size(struct device *dev,
630 if (dev->dma_parms) {
631 dev->dma_parms->max_segment_size = size;
637 static inline unsigned long dma_get_seg_boundary(struct device *dev)
639 if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
640 return dev->dma_parms->segment_boundary_mask;
641 return DMA_BIT_MASK(32);
644 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
646 if (dev->dma_parms) {
647 dev->dma_parms->segment_boundary_mask = mask;
654 static inline unsigned long dma_max_pfn(struct device *dev)
656 return *dev->dma_mask >> PAGE_SHIFT;
660 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
661 dma_addr_t *dma_handle, gfp_t flag)
663 void *ret = dma_alloc_coherent(dev, size, dma_handle,
668 #ifdef CONFIG_HAS_DMA
669 static inline int dma_get_cache_alignment(void)
671 #ifdef ARCH_DMA_MINALIGN
672 return ARCH_DMA_MINALIGN;
678 /* flags for the coherent memory api */
679 #define DMA_MEMORY_MAP 0x01
680 #define DMA_MEMORY_IO 0x02
681 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
682 #define DMA_MEMORY_EXCLUSIVE 0x08
684 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
685 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
686 dma_addr_t device_addr, size_t size, int flags);
687 void dma_release_declared_memory(struct device *dev);
688 void *dma_mark_declared_memory_occupied(struct device *dev,
689 dma_addr_t device_addr, size_t size);
692 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
693 dma_addr_t device_addr, size_t size, int flags)
699 dma_release_declared_memory(struct device *dev)
704 dma_mark_declared_memory_occupied(struct device *dev,
705 dma_addr_t device_addr, size_t size)
707 return ERR_PTR(-EBUSY);
709 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
714 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
715 dma_addr_t *dma_handle, gfp_t gfp);
716 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
717 dma_addr_t dma_handle);
718 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
719 dma_addr_t *dma_handle, gfp_t gfp);
720 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
721 dma_addr_t dma_handle);
722 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
723 extern int dmam_declare_coherent_memory(struct device *dev,
724 phys_addr_t phys_addr,
725 dma_addr_t device_addr, size_t size,
727 extern void dmam_release_declared_memory(struct device *dev);
728 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
729 static inline int dmam_declare_coherent_memory(struct device *dev,
730 phys_addr_t phys_addr, dma_addr_t device_addr,
731 size_t size, gfp_t gfp)
736 static inline void dmam_release_declared_memory(struct device *dev)
739 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
741 static inline void *dma_alloc_wc(struct device *dev, size_t size,
742 dma_addr_t *dma_addr, gfp_t gfp)
744 return dma_alloc_attrs(dev, size, dma_addr, gfp,
745 DMA_ATTR_WRITE_COMBINE);
747 #ifndef dma_alloc_writecombine
748 #define dma_alloc_writecombine dma_alloc_wc
751 static inline void dma_free_wc(struct device *dev, size_t size,
752 void *cpu_addr, dma_addr_t dma_addr)
754 return dma_free_attrs(dev, size, cpu_addr, dma_addr,
755 DMA_ATTR_WRITE_COMBINE);
757 #ifndef dma_free_writecombine
758 #define dma_free_writecombine dma_free_wc
761 static inline int dma_mmap_wc(struct device *dev,
762 struct vm_area_struct *vma,
763 void *cpu_addr, dma_addr_t dma_addr,
766 return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
767 DMA_ATTR_WRITE_COMBINE);
769 #ifndef dma_mmap_writecombine
770 #define dma_mmap_writecombine dma_mmap_wc
773 #if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
774 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
775 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
776 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
777 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
778 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
779 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
781 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
782 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
783 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
784 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
785 #define dma_unmap_len(PTR, LEN_NAME) (0)
786 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)