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)
61 * A dma_addr_t can hold any valid DMA or bus address for the platform.
62 * It can be given to a device to use as a DMA source or target. A CPU cannot
63 * reference a dma_addr_t directly because there may be translation between
64 * its physical address space and the bus address space.
67 void* (*alloc)(struct device *dev, size_t size,
68 dma_addr_t *dma_handle, gfp_t gfp,
70 void (*free)(struct device *dev, size_t size,
71 void *vaddr, dma_addr_t dma_handle,
73 int (*mmap)(struct device *, struct vm_area_struct *,
74 void *, dma_addr_t, size_t,
77 int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
78 dma_addr_t, size_t, unsigned long attrs);
80 dma_addr_t (*map_page)(struct device *dev, struct page *page,
81 unsigned long offset, size_t size,
82 enum dma_data_direction dir,
84 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
85 size_t size, enum dma_data_direction dir,
88 * map_sg returns 0 on error and a value > 0 on success.
89 * It should never return a value < 0.
91 int (*map_sg)(struct device *dev, struct scatterlist *sg,
92 int nents, enum dma_data_direction dir,
94 void (*unmap_sg)(struct device *dev,
95 struct scatterlist *sg, int nents,
96 enum dma_data_direction dir,
98 dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
99 size_t size, enum dma_data_direction dir,
100 unsigned long attrs);
101 void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
102 size_t size, enum dma_data_direction dir,
103 unsigned long attrs);
104 void (*sync_single_for_cpu)(struct device *dev,
105 dma_addr_t dma_handle, size_t size,
106 enum dma_data_direction dir);
107 void (*sync_single_for_device)(struct device *dev,
108 dma_addr_t dma_handle, size_t size,
109 enum dma_data_direction dir);
110 void (*sync_sg_for_cpu)(struct device *dev,
111 struct scatterlist *sg, int nents,
112 enum dma_data_direction dir);
113 void (*sync_sg_for_device)(struct device *dev,
114 struct scatterlist *sg, int nents,
115 enum dma_data_direction dir);
116 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
117 int (*dma_supported)(struct device *dev, u64 mask);
118 int (*set_dma_mask)(struct device *dev, u64 mask);
119 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
120 u64 (*get_required_mask)(struct device *dev);
125 extern struct dma_map_ops dma_noop_ops;
127 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
129 #define DMA_MASK_NONE 0x0ULL
131 static inline int valid_dma_direction(int dma_direction)
133 return ((dma_direction == DMA_BIDIRECTIONAL) ||
134 (dma_direction == DMA_TO_DEVICE) ||
135 (dma_direction == DMA_FROM_DEVICE));
138 static inline int is_device_dma_capable(struct device *dev)
140 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
143 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
145 * These three functions are only for dma allocator.
146 * Don't use them in device drivers.
148 int dma_alloc_from_coherent(struct device *dev, ssize_t size,
149 dma_addr_t *dma_handle, void **ret);
150 int dma_release_from_coherent(struct device *dev, int order, void *vaddr);
152 int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
153 void *cpu_addr, size_t size, int *ret);
155 #define dma_alloc_from_coherent(dev, size, handle, ret) (0)
156 #define dma_release_from_coherent(dev, order, vaddr) (0)
157 #define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
158 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
160 #ifdef CONFIG_HAS_DMA
161 #include <asm/dma-mapping.h>
164 * Define the dma api to allow compilation but not linking of
165 * dma dependent code. Code that depends on the dma-mapping
166 * API needs to set 'depends on HAS_DMA' in its Kconfig
168 extern struct dma_map_ops bad_dma_ops;
169 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
175 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
177 enum dma_data_direction dir,
180 struct dma_map_ops *ops = get_dma_ops(dev);
183 kmemcheck_mark_initialized(ptr, size);
184 BUG_ON(!valid_dma_direction(dir));
185 addr = ops->map_page(dev, virt_to_page(ptr),
186 offset_in_page(ptr), size,
188 debug_dma_map_page(dev, virt_to_page(ptr),
189 offset_in_page(ptr), size,
194 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
196 enum dma_data_direction dir,
199 struct dma_map_ops *ops = get_dma_ops(dev);
201 BUG_ON(!valid_dma_direction(dir));
203 ops->unmap_page(dev, addr, size, dir, attrs);
204 debug_dma_unmap_page(dev, addr, size, dir, true);
208 * dma_maps_sg_attrs returns 0 on error and > 0 on success.
209 * It should never return a value < 0.
211 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
212 int nents, enum dma_data_direction dir,
215 struct dma_map_ops *ops = get_dma_ops(dev);
217 struct scatterlist *s;
219 for_each_sg(sg, s, nents, i)
220 kmemcheck_mark_initialized(sg_virt(s), s->length);
221 BUG_ON(!valid_dma_direction(dir));
222 ents = ops->map_sg(dev, sg, nents, dir, attrs);
224 debug_dma_map_sg(dev, sg, nents, ents, dir);
229 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
230 int nents, enum dma_data_direction dir,
233 struct dma_map_ops *ops = get_dma_ops(dev);
235 BUG_ON(!valid_dma_direction(dir));
236 debug_dma_unmap_sg(dev, sg, nents, dir);
238 ops->unmap_sg(dev, sg, nents, dir, attrs);
241 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
242 size_t offset, size_t size,
243 enum dma_data_direction dir)
245 struct dma_map_ops *ops = get_dma_ops(dev);
248 kmemcheck_mark_initialized(page_address(page) + offset, size);
249 BUG_ON(!valid_dma_direction(dir));
250 addr = ops->map_page(dev, page, offset, size, dir, 0);
251 debug_dma_map_page(dev, page, offset, size, dir, addr, false);
256 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
257 size_t size, enum dma_data_direction dir)
259 struct dma_map_ops *ops = get_dma_ops(dev);
261 BUG_ON(!valid_dma_direction(dir));
263 ops->unmap_page(dev, addr, size, dir, 0);
264 debug_dma_unmap_page(dev, addr, size, dir, false);
267 static inline dma_addr_t dma_map_resource(struct device *dev,
268 phys_addr_t phys_addr,
270 enum dma_data_direction dir,
273 struct dma_map_ops *ops = get_dma_ops(dev);
276 BUG_ON(!valid_dma_direction(dir));
278 /* Don't allow RAM to be mapped */
279 BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
282 if (ops->map_resource)
283 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
285 debug_dma_map_resource(dev, phys_addr, size, dir, addr);
290 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
291 size_t size, enum dma_data_direction dir,
294 struct dma_map_ops *ops = get_dma_ops(dev);
296 BUG_ON(!valid_dma_direction(dir));
297 if (ops->unmap_resource)
298 ops->unmap_resource(dev, addr, size, dir, attrs);
299 debug_dma_unmap_resource(dev, addr, size, dir);
302 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
304 enum dma_data_direction dir)
306 struct dma_map_ops *ops = get_dma_ops(dev);
308 BUG_ON(!valid_dma_direction(dir));
309 if (ops->sync_single_for_cpu)
310 ops->sync_single_for_cpu(dev, addr, size, dir);
311 debug_dma_sync_single_for_cpu(dev, addr, size, dir);
314 static inline void dma_sync_single_for_device(struct device *dev,
315 dma_addr_t addr, size_t size,
316 enum dma_data_direction dir)
318 struct dma_map_ops *ops = get_dma_ops(dev);
320 BUG_ON(!valid_dma_direction(dir));
321 if (ops->sync_single_for_device)
322 ops->sync_single_for_device(dev, addr, size, dir);
323 debug_dma_sync_single_for_device(dev, addr, size, dir);
326 static inline void dma_sync_single_range_for_cpu(struct device *dev,
328 unsigned long offset,
330 enum dma_data_direction dir)
332 const struct dma_map_ops *ops = get_dma_ops(dev);
334 BUG_ON(!valid_dma_direction(dir));
335 if (ops->sync_single_for_cpu)
336 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
337 debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
340 static inline void dma_sync_single_range_for_device(struct device *dev,
342 unsigned long offset,
344 enum dma_data_direction dir)
346 const struct dma_map_ops *ops = get_dma_ops(dev);
348 BUG_ON(!valid_dma_direction(dir));
349 if (ops->sync_single_for_device)
350 ops->sync_single_for_device(dev, addr + offset, size, dir);
351 debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
355 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
356 int nelems, enum dma_data_direction dir)
358 struct dma_map_ops *ops = get_dma_ops(dev);
360 BUG_ON(!valid_dma_direction(dir));
361 if (ops->sync_sg_for_cpu)
362 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
363 debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
367 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
368 int nelems, enum dma_data_direction dir)
370 struct dma_map_ops *ops = get_dma_ops(dev);
372 BUG_ON(!valid_dma_direction(dir));
373 if (ops->sync_sg_for_device)
374 ops->sync_sg_for_device(dev, sg, nelems, dir);
375 debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
379 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
380 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
381 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
382 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
384 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
385 void *cpu_addr, dma_addr_t dma_addr, size_t size);
387 void *dma_common_contiguous_remap(struct page *page, size_t size,
388 unsigned long vm_flags,
389 pgprot_t prot, const void *caller);
391 void *dma_common_pages_remap(struct page **pages, size_t size,
392 unsigned long vm_flags, pgprot_t prot,
394 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
397 * dma_mmap_attrs - map a coherent DMA allocation into user space
398 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
399 * @vma: vm_area_struct describing requested user mapping
400 * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
401 * @handle: device-view address returned from dma_alloc_attrs
402 * @size: size of memory originally requested in dma_alloc_attrs
403 * @attrs: attributes of mapping properties requested in dma_alloc_attrs
405 * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
406 * into user space. The coherent DMA buffer must not be freed by the
407 * driver until the user space mapping has been released.
410 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
411 dma_addr_t dma_addr, size_t size, unsigned long attrs)
413 struct dma_map_ops *ops = get_dma_ops(dev);
416 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
417 return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
420 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
423 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
424 void *cpu_addr, dma_addr_t dma_addr, size_t size);
427 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
428 dma_addr_t dma_addr, size_t size,
431 struct dma_map_ops *ops = get_dma_ops(dev);
433 if (ops->get_sgtable)
434 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
436 return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
439 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
441 #ifndef arch_dma_alloc_attrs
442 #define arch_dma_alloc_attrs(dev, flag) (true)
445 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
446 dma_addr_t *dma_handle, gfp_t flag,
449 struct dma_map_ops *ops = get_dma_ops(dev);
454 if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr))
457 if (!arch_dma_alloc_attrs(&dev, &flag))
462 cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
463 debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
467 static inline void dma_free_attrs(struct device *dev, size_t size,
468 void *cpu_addr, dma_addr_t dma_handle,
471 struct dma_map_ops *ops = get_dma_ops(dev);
474 WARN_ON(irqs_disabled());
476 if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
479 if (!ops->free || !cpu_addr)
482 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
483 ops->free(dev, size, cpu_addr, dma_handle, attrs);
486 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
487 dma_addr_t *dma_handle, gfp_t flag)
489 return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
492 static inline void dma_free_coherent(struct device *dev, size_t size,
493 void *cpu_addr, dma_addr_t dma_handle)
495 return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
498 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
499 dma_addr_t *dma_handle, gfp_t gfp)
501 return dma_alloc_attrs(dev, size, dma_handle, gfp,
502 DMA_ATTR_NON_CONSISTENT);
505 static inline void dma_free_noncoherent(struct device *dev, size_t size,
506 void *cpu_addr, dma_addr_t dma_handle)
508 dma_free_attrs(dev, size, cpu_addr, dma_handle,
509 DMA_ATTR_NON_CONSISTENT);
512 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
514 debug_dma_mapping_error(dev, dma_addr);
516 if (get_dma_ops(dev)->mapping_error)
517 return get_dma_ops(dev)->mapping_error(dev, dma_addr);
519 #ifdef DMA_ERROR_CODE
520 return dma_addr == DMA_ERROR_CODE;
526 #ifndef HAVE_ARCH_DMA_SUPPORTED
527 static inline int dma_supported(struct device *dev, u64 mask)
529 struct dma_map_ops *ops = get_dma_ops(dev);
533 if (!ops->dma_supported)
535 return ops->dma_supported(dev, mask);
539 #ifndef HAVE_ARCH_DMA_SET_MASK
540 static inline int dma_set_mask(struct device *dev, u64 mask)
542 struct dma_map_ops *ops = get_dma_ops(dev);
544 if (ops->set_dma_mask)
545 return ops->set_dma_mask(dev, mask);
547 if (!dev->dma_mask || !dma_supported(dev, mask))
549 *dev->dma_mask = mask;
554 static inline u64 dma_get_mask(struct device *dev)
556 if (dev && dev->dma_mask && *dev->dma_mask)
557 return *dev->dma_mask;
558 return DMA_BIT_MASK(32);
561 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
562 int dma_set_coherent_mask(struct device *dev, u64 mask);
564 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
566 if (!dma_supported(dev, mask))
568 dev->coherent_dma_mask = mask;
574 * Set both the DMA mask and the coherent DMA mask to the same thing.
575 * Note that we don't check the return value from dma_set_coherent_mask()
576 * as the DMA API guarantees that the coherent DMA mask can be set to
577 * the same or smaller than the streaming DMA mask.
579 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
581 int rc = dma_set_mask(dev, mask);
583 dma_set_coherent_mask(dev, mask);
588 * Similar to the above, except it deals with the case where the device
589 * does not have dev->dma_mask appropriately setup.
591 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
593 dev->dma_mask = &dev->coherent_dma_mask;
594 return dma_set_mask_and_coherent(dev, mask);
597 extern u64 dma_get_required_mask(struct device *dev);
599 #ifndef arch_setup_dma_ops
600 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
601 u64 size, const struct iommu_ops *iommu,
605 #ifndef arch_teardown_dma_ops
606 static inline void arch_teardown_dma_ops(struct device *dev) { }
609 static inline unsigned int dma_get_max_seg_size(struct device *dev)
611 if (dev->dma_parms && dev->dma_parms->max_segment_size)
612 return dev->dma_parms->max_segment_size;
616 static inline unsigned int dma_set_max_seg_size(struct device *dev,
619 if (dev->dma_parms) {
620 dev->dma_parms->max_segment_size = size;
626 static inline unsigned long dma_get_seg_boundary(struct device *dev)
628 if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
629 return dev->dma_parms->segment_boundary_mask;
630 return DMA_BIT_MASK(32);
633 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
635 if (dev->dma_parms) {
636 dev->dma_parms->segment_boundary_mask = mask;
643 static inline unsigned long dma_max_pfn(struct device *dev)
645 return *dev->dma_mask >> PAGE_SHIFT;
649 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
650 dma_addr_t *dma_handle, gfp_t flag)
652 void *ret = dma_alloc_coherent(dev, size, dma_handle,
657 #ifdef CONFIG_HAS_DMA
658 static inline int dma_get_cache_alignment(void)
660 #ifdef ARCH_DMA_MINALIGN
661 return ARCH_DMA_MINALIGN;
667 /* flags for the coherent memory api */
668 #define DMA_MEMORY_MAP 0x01
669 #define DMA_MEMORY_IO 0x02
670 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
671 #define DMA_MEMORY_EXCLUSIVE 0x08
673 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
674 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
675 dma_addr_t device_addr, size_t size, int flags);
676 void dma_release_declared_memory(struct device *dev);
677 void *dma_mark_declared_memory_occupied(struct device *dev,
678 dma_addr_t device_addr, size_t size);
681 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
682 dma_addr_t device_addr, size_t size, int flags)
688 dma_release_declared_memory(struct device *dev)
693 dma_mark_declared_memory_occupied(struct device *dev,
694 dma_addr_t device_addr, size_t size)
696 return ERR_PTR(-EBUSY);
698 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
703 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
704 dma_addr_t *dma_handle, gfp_t gfp);
705 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
706 dma_addr_t dma_handle);
707 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
708 dma_addr_t *dma_handle, gfp_t gfp);
709 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
710 dma_addr_t dma_handle);
711 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
712 extern int dmam_declare_coherent_memory(struct device *dev,
713 phys_addr_t phys_addr,
714 dma_addr_t device_addr, size_t size,
716 extern void dmam_release_declared_memory(struct device *dev);
717 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
718 static inline int dmam_declare_coherent_memory(struct device *dev,
719 phys_addr_t phys_addr, dma_addr_t device_addr,
720 size_t size, gfp_t gfp)
725 static inline void dmam_release_declared_memory(struct device *dev)
728 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
730 static inline void *dma_alloc_wc(struct device *dev, size_t size,
731 dma_addr_t *dma_addr, gfp_t gfp)
733 return dma_alloc_attrs(dev, size, dma_addr, gfp,
734 DMA_ATTR_WRITE_COMBINE);
736 #ifndef dma_alloc_writecombine
737 #define dma_alloc_writecombine dma_alloc_wc
740 static inline void dma_free_wc(struct device *dev, size_t size,
741 void *cpu_addr, dma_addr_t dma_addr)
743 return dma_free_attrs(dev, size, cpu_addr, dma_addr,
744 DMA_ATTR_WRITE_COMBINE);
746 #ifndef dma_free_writecombine
747 #define dma_free_writecombine dma_free_wc
750 static inline int dma_mmap_wc(struct device *dev,
751 struct vm_area_struct *vma,
752 void *cpu_addr, dma_addr_t dma_addr,
755 return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
756 DMA_ATTR_WRITE_COMBINE);
758 #ifndef dma_mmap_writecombine
759 #define dma_mmap_writecombine dma_mmap_wc
762 #if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
763 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
764 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
765 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
766 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
767 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
768 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
770 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
771 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
772 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
773 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
774 #define dma_unmap_len(PTR, LEN_NAME) (0)
775 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)