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_single_attrs(struct device *dev, void *ptr,
289 enum dma_data_direction dir,
292 const struct dma_map_ops *ops = get_dma_ops(dev);
295 BUG_ON(!valid_dma_direction(dir));
296 debug_dma_map_single(dev, ptr, size);
297 if (dma_is_direct(ops))
298 addr = dma_direct_map_page(dev, virt_to_page(ptr),
299 offset_in_page(ptr), size, dir, attrs);
301 addr = ops->map_page(dev, virt_to_page(ptr),
302 offset_in_page(ptr), size, dir, attrs);
303 debug_dma_map_page(dev, virt_to_page(ptr),
304 offset_in_page(ptr), size,
309 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
311 enum dma_data_direction dir,
314 const struct dma_map_ops *ops = get_dma_ops(dev);
316 BUG_ON(!valid_dma_direction(dir));
317 if (dma_is_direct(ops))
318 dma_direct_unmap_page(dev, addr, size, dir, attrs);
319 else if (ops->unmap_page)
320 ops->unmap_page(dev, addr, size, dir, attrs);
321 debug_dma_unmap_page(dev, addr, size, dir, true);
324 static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr,
325 size_t size, enum dma_data_direction dir, unsigned long attrs)
327 return dma_unmap_single_attrs(dev, addr, size, dir, attrs);
331 * dma_maps_sg_attrs returns 0 on error and > 0 on success.
332 * It should never return a value < 0.
334 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
335 int nents, enum dma_data_direction dir,
338 const struct dma_map_ops *ops = get_dma_ops(dev);
341 BUG_ON(!valid_dma_direction(dir));
342 if (dma_is_direct(ops))
343 ents = dma_direct_map_sg(dev, sg, nents, dir, attrs);
345 ents = ops->map_sg(dev, sg, nents, dir, attrs);
347 debug_dma_map_sg(dev, sg, nents, ents, dir);
352 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
353 int nents, enum dma_data_direction dir,
356 const struct dma_map_ops *ops = get_dma_ops(dev);
358 BUG_ON(!valid_dma_direction(dir));
359 debug_dma_unmap_sg(dev, sg, nents, dir);
360 if (dma_is_direct(ops))
361 dma_direct_unmap_sg(dev, sg, nents, dir, attrs);
362 else if (ops->unmap_sg)
363 ops->unmap_sg(dev, sg, nents, dir, attrs);
366 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
368 size_t offset, size_t size,
369 enum dma_data_direction dir,
372 const struct dma_map_ops *ops = get_dma_ops(dev);
375 BUG_ON(!valid_dma_direction(dir));
376 if (dma_is_direct(ops))
377 addr = dma_direct_map_page(dev, page, offset, size, dir, attrs);
379 addr = ops->map_page(dev, page, offset, size, dir, attrs);
380 debug_dma_map_page(dev, page, offset, size, dir, addr, false);
385 static inline dma_addr_t dma_map_resource(struct device *dev,
386 phys_addr_t phys_addr,
388 enum dma_data_direction dir,
391 const struct dma_map_ops *ops = get_dma_ops(dev);
394 BUG_ON(!valid_dma_direction(dir));
396 /* Don't allow RAM to be mapped */
397 BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
400 if (ops && ops->map_resource)
401 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
403 debug_dma_map_resource(dev, phys_addr, size, dir, addr);
408 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
409 size_t size, enum dma_data_direction dir,
412 const struct dma_map_ops *ops = get_dma_ops(dev);
414 BUG_ON(!valid_dma_direction(dir));
415 if (ops && ops->unmap_resource)
416 ops->unmap_resource(dev, addr, size, dir, attrs);
417 debug_dma_unmap_resource(dev, addr, size, dir);
420 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
422 enum dma_data_direction dir)
424 const struct dma_map_ops *ops = get_dma_ops(dev);
426 BUG_ON(!valid_dma_direction(dir));
427 if (dma_is_direct(ops))
428 dma_direct_sync_single_for_cpu(dev, addr, size, dir);
429 else if (ops->sync_single_for_cpu)
430 ops->sync_single_for_cpu(dev, addr, size, dir);
431 debug_dma_sync_single_for_cpu(dev, addr, size, dir);
434 static inline void dma_sync_single_range_for_cpu(struct device *dev,
435 dma_addr_t addr, unsigned long offset, size_t size,
436 enum dma_data_direction dir)
438 return dma_sync_single_for_cpu(dev, addr + offset, size, dir);
441 static inline void dma_sync_single_for_device(struct device *dev,
442 dma_addr_t addr, size_t size,
443 enum dma_data_direction dir)
445 const struct dma_map_ops *ops = get_dma_ops(dev);
447 BUG_ON(!valid_dma_direction(dir));
448 if (dma_is_direct(ops))
449 dma_direct_sync_single_for_device(dev, addr, size, dir);
450 else if (ops->sync_single_for_device)
451 ops->sync_single_for_device(dev, addr, size, dir);
452 debug_dma_sync_single_for_device(dev, addr, size, dir);
455 static inline void dma_sync_single_range_for_device(struct device *dev,
456 dma_addr_t addr, unsigned long offset, size_t size,
457 enum dma_data_direction dir)
459 return dma_sync_single_for_device(dev, addr + offset, size, dir);
463 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
464 int nelems, enum dma_data_direction dir)
466 const struct dma_map_ops *ops = get_dma_ops(dev);
468 BUG_ON(!valid_dma_direction(dir));
469 if (dma_is_direct(ops))
470 dma_direct_sync_sg_for_cpu(dev, sg, nelems, dir);
471 else if (ops->sync_sg_for_cpu)
472 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
473 debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
477 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
478 int nelems, enum dma_data_direction dir)
480 const struct dma_map_ops *ops = get_dma_ops(dev);
482 BUG_ON(!valid_dma_direction(dir));
483 if (dma_is_direct(ops))
484 dma_direct_sync_sg_for_device(dev, sg, nelems, dir);
485 else if (ops->sync_sg_for_device)
486 ops->sync_sg_for_device(dev, sg, nelems, dir);
487 debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
491 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
492 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
493 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
494 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
495 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
496 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
498 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
499 enum dma_data_direction dir);
501 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
502 void *cpu_addr, dma_addr_t dma_addr, size_t size,
503 unsigned long attrs);
505 void *dma_common_contiguous_remap(struct page *page, size_t size,
506 unsigned long vm_flags,
507 pgprot_t prot, const void *caller);
509 void *dma_common_pages_remap(struct page **pages, size_t size,
510 unsigned long vm_flags, pgprot_t prot,
512 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
514 int __init dma_atomic_pool_init(gfp_t gfp, pgprot_t prot);
515 bool dma_in_atomic_pool(void *start, size_t size);
516 void *dma_alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags);
517 bool dma_free_from_pool(void *start, size_t size);
519 int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
520 void *cpu_addr, dma_addr_t dma_addr, size_t size,
521 unsigned long attrs);
522 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
525 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr,
526 dma_addr_t dma_addr, size_t size, unsigned long attrs);
528 int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt,
529 void *cpu_addr, dma_addr_t dma_addr, size_t size,
530 unsigned long attrs);
531 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
533 void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
534 gfp_t flag, unsigned long attrs);
535 void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
536 dma_addr_t dma_handle, unsigned long attrs);
538 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
539 dma_addr_t *dma_handle, gfp_t gfp)
542 return dma_alloc_attrs(dev, size, dma_handle, gfp,
543 (gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0);
546 static inline void dma_free_coherent(struct device *dev, size_t size,
547 void *cpu_addr, dma_addr_t dma_handle)
549 return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
552 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
554 debug_dma_mapping_error(dev, dma_addr);
556 if (dma_addr == DMA_MAPPING_ERROR)
561 int dma_supported(struct device *dev, u64 mask);
562 int dma_set_mask(struct device *dev, u64 mask);
563 int dma_set_coherent_mask(struct device *dev, u64 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);
573 * Set both the DMA mask and the coherent DMA mask to the same thing.
574 * Note that we don't check the return value from dma_set_coherent_mask()
575 * as the DMA API guarantees that the coherent DMA mask can be set to
576 * the same or smaller than the streaming DMA mask.
578 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
580 int rc = dma_set_mask(dev, mask);
582 dma_set_coherent_mask(dev, mask);
587 * Similar to the above, except it deals with the case where the device
588 * does not have dev->dma_mask appropriately setup.
590 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
592 dev->dma_mask = &dev->coherent_dma_mask;
593 return dma_set_mask_and_coherent(dev, mask);
596 extern u64 dma_get_required_mask(struct device *dev);
598 #ifndef arch_setup_dma_ops
599 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
600 u64 size, const struct iommu_ops *iommu,
604 #ifndef arch_teardown_dma_ops
605 static inline void arch_teardown_dma_ops(struct device *dev) { }
608 static inline unsigned int dma_get_max_seg_size(struct device *dev)
610 if (dev->dma_parms && dev->dma_parms->max_segment_size)
611 return dev->dma_parms->max_segment_size;
615 static inline int dma_set_max_seg_size(struct device *dev, unsigned int size)
617 if (dev->dma_parms) {
618 dev->dma_parms->max_segment_size = size;
624 static inline unsigned long dma_get_seg_boundary(struct device *dev)
626 if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
627 return dev->dma_parms->segment_boundary_mask;
628 return DMA_BIT_MASK(32);
631 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
633 if (dev->dma_parms) {
634 dev->dma_parms->segment_boundary_mask = mask;
641 static inline unsigned long dma_max_pfn(struct device *dev)
643 return (*dev->dma_mask >> PAGE_SHIFT) + dev->dma_pfn_offset;
648 * Please always use dma_alloc_coherent instead as it already zeroes the memory!
650 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
651 dma_addr_t *dma_handle, gfp_t flag)
653 return dma_alloc_coherent(dev, size, dma_handle, flag);
656 static inline int dma_get_cache_alignment(void)
658 #ifdef ARCH_DMA_MINALIGN
659 return ARCH_DMA_MINALIGN;
664 /* flags for the coherent memory api */
665 #define DMA_MEMORY_EXCLUSIVE 0x01
667 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
668 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
669 dma_addr_t device_addr, size_t size, int flags);
670 void dma_release_declared_memory(struct device *dev);
671 void *dma_mark_declared_memory_occupied(struct device *dev,
672 dma_addr_t device_addr, size_t size);
675 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
676 dma_addr_t device_addr, size_t size, int flags)
682 dma_release_declared_memory(struct device *dev)
687 dma_mark_declared_memory_occupied(struct device *dev,
688 dma_addr_t device_addr, size_t size)
690 return ERR_PTR(-EBUSY);
692 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
697 #ifdef CONFIG_HAS_DMA
698 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
699 dma_addr_t *dma_handle, gfp_t gfp);
700 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
701 dma_addr_t dma_handle);
702 #else /* !CONFIG_HAS_DMA */
703 static inline void *dmam_alloc_coherent(struct device *dev, size_t size,
704 dma_addr_t *dma_handle, gfp_t gfp)
706 static inline void dmam_free_coherent(struct device *dev, size_t size,
707 void *vaddr, dma_addr_t dma_handle) { }
708 #endif /* !CONFIG_HAS_DMA */
710 extern void *dmam_alloc_attrs(struct device *dev, size_t size,
711 dma_addr_t *dma_handle, gfp_t gfp,
712 unsigned long attrs);
713 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
714 extern int dmam_declare_coherent_memory(struct device *dev,
715 phys_addr_t phys_addr,
716 dma_addr_t device_addr, size_t size,
718 extern void dmam_release_declared_memory(struct device *dev);
719 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
720 static inline int dmam_declare_coherent_memory(struct device *dev,
721 phys_addr_t phys_addr, dma_addr_t device_addr,
722 size_t size, gfp_t gfp)
727 static inline void dmam_release_declared_memory(struct device *dev)
730 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
732 static inline void *dma_alloc_wc(struct device *dev, size_t size,
733 dma_addr_t *dma_addr, gfp_t gfp)
735 unsigned long attrs = DMA_ATTR_NO_WARN;
737 if (gfp & __GFP_NOWARN)
738 attrs |= DMA_ATTR_NO_WARN;
740 return dma_alloc_attrs(dev, size, dma_addr, gfp, attrs);
742 #ifndef dma_alloc_writecombine
743 #define dma_alloc_writecombine dma_alloc_wc
746 static inline void dma_free_wc(struct device *dev, size_t size,
747 void *cpu_addr, dma_addr_t dma_addr)
749 return dma_free_attrs(dev, size, cpu_addr, dma_addr,
750 DMA_ATTR_WRITE_COMBINE);
752 #ifndef dma_free_writecombine
753 #define dma_free_writecombine dma_free_wc
756 static inline int dma_mmap_wc(struct device *dev,
757 struct vm_area_struct *vma,
758 void *cpu_addr, dma_addr_t dma_addr,
761 return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
762 DMA_ATTR_WRITE_COMBINE);
764 #ifndef dma_mmap_writecombine
765 #define dma_mmap_writecombine dma_mmap_wc
768 #ifdef CONFIG_NEED_DMA_MAP_STATE
769 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
770 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
771 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
772 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
773 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
774 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
776 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
777 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
778 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
779 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
780 #define dma_unmap_len(PTR, LEN_NAME) (0)
781 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)