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/kmemcheck.h>
13 #include <linux/bug.h>
14 #include <linux/mem_encrypt.h>
17 * List of possible attributes associated with a DMA mapping. The semantics
18 * of each attribute should be defined in Documentation/DMA-attributes.txt.
20 * DMA_ATTR_WRITE_BARRIER: DMA to a memory region with this attribute
21 * forces all pending DMA writes to complete.
23 #define DMA_ATTR_WRITE_BARRIER (1UL << 0)
25 * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping
26 * may be weakly ordered, that is that reads and writes may pass each other.
28 #define DMA_ATTR_WEAK_ORDERING (1UL << 1)
30 * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be
31 * buffered to improve performance.
33 #define DMA_ATTR_WRITE_COMBINE (1UL << 2)
35 * DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either
36 * consistent or non-consistent memory as it sees fit.
38 #define DMA_ATTR_NON_CONSISTENT (1UL << 3)
40 * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
41 * virtual mapping for the allocated buffer.
43 #define DMA_ATTR_NO_KERNEL_MAPPING (1UL << 4)
45 * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of
46 * the CPU cache for the given buffer assuming that it has been already
47 * transferred to 'device' domain.
49 #define DMA_ATTR_SKIP_CPU_SYNC (1UL << 5)
51 * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer
54 #define DMA_ATTR_FORCE_CONTIGUOUS (1UL << 6)
56 * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem
57 * that it's probably not worth the time to try to allocate memory to in a way
58 * that gives better TLB efficiency.
60 #define DMA_ATTR_ALLOC_SINGLE_PAGES (1UL << 7)
62 * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress
63 * allocation failure reports (similarly to __GFP_NOWARN).
65 #define DMA_ATTR_NO_WARN (1UL << 8)
68 * DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully
69 * accessible at an elevated privilege level (and ideally inaccessible or
70 * at least read-only at lesser-privileged levels).
72 #define DMA_ATTR_PRIVILEGED (1UL << 9)
75 * A dma_addr_t can hold any valid DMA or bus address for the platform.
76 * It can be given to a device to use as a DMA source or target. A CPU cannot
77 * reference a dma_addr_t directly because there may be translation between
78 * its physical address space and the bus address space.
81 void* (*alloc)(struct device *dev, size_t size,
82 dma_addr_t *dma_handle, gfp_t gfp,
84 void (*free)(struct device *dev, size_t size,
85 void *vaddr, dma_addr_t dma_handle,
87 int (*mmap)(struct device *, struct vm_area_struct *,
88 void *, dma_addr_t, size_t,
91 int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
92 dma_addr_t, size_t, unsigned long attrs);
94 dma_addr_t (*map_page)(struct device *dev, struct page *page,
95 unsigned long offset, size_t size,
96 enum dma_data_direction dir,
98 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
99 size_t size, enum dma_data_direction dir,
100 unsigned long attrs);
102 * map_sg returns 0 on error and a value > 0 on success.
103 * It should never return a value < 0.
105 int (*map_sg)(struct device *dev, struct scatterlist *sg,
106 int nents, enum dma_data_direction dir,
107 unsigned long attrs);
108 void (*unmap_sg)(struct device *dev,
109 struct scatterlist *sg, int nents,
110 enum dma_data_direction dir,
111 unsigned long attrs);
112 dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
113 size_t size, enum dma_data_direction dir,
114 unsigned long attrs);
115 void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
116 size_t size, enum dma_data_direction dir,
117 unsigned long attrs);
118 void (*sync_single_for_cpu)(struct device *dev,
119 dma_addr_t dma_handle, size_t size,
120 enum dma_data_direction dir);
121 void (*sync_single_for_device)(struct device *dev,
122 dma_addr_t dma_handle, size_t size,
123 enum dma_data_direction dir);
124 void (*sync_sg_for_cpu)(struct device *dev,
125 struct scatterlist *sg, int nents,
126 enum dma_data_direction dir);
127 void (*sync_sg_for_device)(struct device *dev,
128 struct scatterlist *sg, int nents,
129 enum dma_data_direction dir);
130 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
131 int (*dma_supported)(struct device *dev, u64 mask);
132 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
133 u64 (*get_required_mask)(struct device *dev);
138 extern const struct dma_map_ops dma_noop_ops;
139 extern const struct dma_map_ops dma_virt_ops;
141 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
143 #define DMA_MASK_NONE 0x0ULL
145 static inline int valid_dma_direction(int dma_direction)
147 return ((dma_direction == DMA_BIDIRECTIONAL) ||
148 (dma_direction == DMA_TO_DEVICE) ||
149 (dma_direction == DMA_FROM_DEVICE));
152 static inline int is_device_dma_capable(struct device *dev)
154 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
157 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
159 * These three functions are only for dma allocator.
160 * Don't use them in device drivers.
162 int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
163 dma_addr_t *dma_handle, void **ret);
164 int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
166 int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
167 void *cpu_addr, size_t size, int *ret);
169 void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle);
170 int dma_release_from_global_coherent(int order, void *vaddr);
171 int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
172 size_t size, int *ret);
175 #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
176 #define dma_release_from_dev_coherent(dev, order, vaddr) (0)
177 #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
179 static inline void *dma_alloc_from_global_coherent(ssize_t size,
180 dma_addr_t *dma_handle)
185 static inline int dma_release_from_global_coherent(int order, void *vaddr)
190 static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
191 void *cpu_addr, size_t size,
196 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
198 #ifdef CONFIG_HAS_DMA
199 #include <asm/dma-mapping.h>
200 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
202 if (dev && dev->dma_ops)
204 return get_arch_dma_ops(dev ? dev->bus : NULL);
207 static inline void set_dma_ops(struct device *dev,
208 const struct dma_map_ops *dma_ops)
210 dev->dma_ops = dma_ops;
214 * Define the dma api to allow compilation but not linking of
215 * dma dependent code. Code that depends on the dma-mapping
216 * API needs to set 'depends on HAS_DMA' in its Kconfig
218 extern const struct dma_map_ops bad_dma_ops;
219 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
225 static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
227 enum dma_data_direction dir,
230 const struct dma_map_ops *ops = get_dma_ops(dev);
233 kmemcheck_mark_initialized(ptr, size);
234 BUG_ON(!valid_dma_direction(dir));
235 addr = ops->map_page(dev, virt_to_page(ptr),
236 offset_in_page(ptr), size,
238 debug_dma_map_page(dev, virt_to_page(ptr),
239 offset_in_page(ptr), size,
244 static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
246 enum dma_data_direction dir,
249 const struct dma_map_ops *ops = get_dma_ops(dev);
251 BUG_ON(!valid_dma_direction(dir));
253 ops->unmap_page(dev, addr, size, dir, attrs);
254 debug_dma_unmap_page(dev, addr, size, dir, true);
258 * dma_maps_sg_attrs returns 0 on error and > 0 on success.
259 * It should never return a value < 0.
261 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
262 int nents, enum dma_data_direction dir,
265 const struct dma_map_ops *ops = get_dma_ops(dev);
267 struct scatterlist *s;
269 for_each_sg(sg, s, nents, i)
270 kmemcheck_mark_initialized(sg_virt(s), s->length);
271 BUG_ON(!valid_dma_direction(dir));
272 ents = ops->map_sg(dev, sg, nents, dir, attrs);
274 debug_dma_map_sg(dev, sg, nents, ents, dir);
279 static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
280 int nents, enum dma_data_direction dir,
283 const struct dma_map_ops *ops = get_dma_ops(dev);
285 BUG_ON(!valid_dma_direction(dir));
286 debug_dma_unmap_sg(dev, sg, nents, dir);
288 ops->unmap_sg(dev, sg, nents, dir, attrs);
291 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
293 size_t offset, size_t size,
294 enum dma_data_direction dir,
297 const struct dma_map_ops *ops = get_dma_ops(dev);
300 kmemcheck_mark_initialized(page_address(page) + offset, size);
301 BUG_ON(!valid_dma_direction(dir));
302 addr = ops->map_page(dev, page, offset, size, dir, attrs);
303 debug_dma_map_page(dev, page, offset, size, dir, addr, false);
308 static inline void dma_unmap_page_attrs(struct device *dev,
309 dma_addr_t addr, size_t size,
310 enum dma_data_direction dir,
313 const struct dma_map_ops *ops = get_dma_ops(dev);
315 BUG_ON(!valid_dma_direction(dir));
317 ops->unmap_page(dev, addr, size, dir, attrs);
318 debug_dma_unmap_page(dev, addr, size, dir, false);
321 static inline dma_addr_t dma_map_resource(struct device *dev,
322 phys_addr_t phys_addr,
324 enum dma_data_direction dir,
327 const struct dma_map_ops *ops = get_dma_ops(dev);
330 BUG_ON(!valid_dma_direction(dir));
332 /* Don't allow RAM to be mapped */
333 BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
336 if (ops->map_resource)
337 addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
339 debug_dma_map_resource(dev, phys_addr, size, dir, addr);
344 static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
345 size_t size, enum dma_data_direction dir,
348 const struct dma_map_ops *ops = get_dma_ops(dev);
350 BUG_ON(!valid_dma_direction(dir));
351 if (ops->unmap_resource)
352 ops->unmap_resource(dev, addr, size, dir, attrs);
353 debug_dma_unmap_resource(dev, addr, size, dir);
356 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
358 enum dma_data_direction dir)
360 const struct dma_map_ops *ops = get_dma_ops(dev);
362 BUG_ON(!valid_dma_direction(dir));
363 if (ops->sync_single_for_cpu)
364 ops->sync_single_for_cpu(dev, addr, size, dir);
365 debug_dma_sync_single_for_cpu(dev, addr, size, dir);
368 static inline void dma_sync_single_for_device(struct device *dev,
369 dma_addr_t addr, size_t size,
370 enum dma_data_direction dir)
372 const struct dma_map_ops *ops = get_dma_ops(dev);
374 BUG_ON(!valid_dma_direction(dir));
375 if (ops->sync_single_for_device)
376 ops->sync_single_for_device(dev, addr, size, dir);
377 debug_dma_sync_single_for_device(dev, addr, size, dir);
380 static inline void dma_sync_single_range_for_cpu(struct device *dev,
382 unsigned long offset,
384 enum dma_data_direction dir)
386 const struct dma_map_ops *ops = get_dma_ops(dev);
388 BUG_ON(!valid_dma_direction(dir));
389 if (ops->sync_single_for_cpu)
390 ops->sync_single_for_cpu(dev, addr + offset, size, dir);
391 debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
394 static inline void dma_sync_single_range_for_device(struct device *dev,
396 unsigned long offset,
398 enum dma_data_direction dir)
400 const struct dma_map_ops *ops = get_dma_ops(dev);
402 BUG_ON(!valid_dma_direction(dir));
403 if (ops->sync_single_for_device)
404 ops->sync_single_for_device(dev, addr + offset, size, dir);
405 debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
409 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
410 int nelems, 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->sync_sg_for_cpu)
416 ops->sync_sg_for_cpu(dev, sg, nelems, dir);
417 debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
421 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
422 int nelems, 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 (ops->sync_sg_for_device)
428 ops->sync_sg_for_device(dev, sg, nelems, dir);
429 debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
433 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
434 #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
435 #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
436 #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
437 #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
438 #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
440 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
441 void *cpu_addr, dma_addr_t dma_addr, size_t size);
443 void *dma_common_contiguous_remap(struct page *page, size_t size,
444 unsigned long vm_flags,
445 pgprot_t prot, const void *caller);
447 void *dma_common_pages_remap(struct page **pages, size_t size,
448 unsigned long vm_flags, pgprot_t prot,
450 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
453 * dma_mmap_attrs - map a coherent DMA allocation into user space
454 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
455 * @vma: vm_area_struct describing requested user mapping
456 * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
457 * @handle: device-view address returned from dma_alloc_attrs
458 * @size: size of memory originally requested in dma_alloc_attrs
459 * @attrs: attributes of mapping properties requested in dma_alloc_attrs
461 * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
462 * into user space. The coherent DMA buffer must not be freed by the
463 * driver until the user space mapping has been released.
466 dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
467 dma_addr_t dma_addr, size_t size, unsigned long attrs)
469 const struct dma_map_ops *ops = get_dma_ops(dev);
472 return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
473 return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
476 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
479 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
480 void *cpu_addr, dma_addr_t dma_addr, size_t size);
483 dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
484 dma_addr_t dma_addr, size_t size,
487 const struct dma_map_ops *ops = get_dma_ops(dev);
489 if (ops->get_sgtable)
490 return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
492 return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
495 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
497 #ifndef arch_dma_alloc_attrs
498 #define arch_dma_alloc_attrs(dev, flag) (true)
501 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
502 dma_addr_t *dma_handle, gfp_t flag,
505 const struct dma_map_ops *ops = get_dma_ops(dev);
510 if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
513 if (!arch_dma_alloc_attrs(&dev, &flag))
518 cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
519 debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
523 static inline void dma_free_attrs(struct device *dev, size_t size,
524 void *cpu_addr, dma_addr_t dma_handle,
527 const struct dma_map_ops *ops = get_dma_ops(dev);
530 WARN_ON(irqs_disabled());
532 if (dma_release_from_dev_coherent(dev, get_order(size), cpu_addr))
535 if (!ops->free || !cpu_addr)
538 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
539 ops->free(dev, size, cpu_addr, dma_handle, attrs);
542 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
543 dma_addr_t *dma_handle, gfp_t flag)
545 return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
548 static inline void dma_free_coherent(struct device *dev, size_t size,
549 void *cpu_addr, dma_addr_t dma_handle)
551 return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
554 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
556 const struct dma_map_ops *ops = get_dma_ops(dev);
558 debug_dma_mapping_error(dev, dma_addr);
559 if (ops->mapping_error)
560 return ops->mapping_error(dev, dma_addr);
564 static inline void dma_check_mask(struct device *dev, u64 mask)
566 if (sme_active() && (mask < (((u64)sme_get_me_mask() << 1) - 1)))
567 dev_warn(dev, "SME is active, device will require DMA bounce buffers\n");
570 static inline int dma_supported(struct device *dev, u64 mask)
572 const struct dma_map_ops *ops = get_dma_ops(dev);
576 if (!ops->dma_supported)
578 return ops->dma_supported(dev, mask);
581 #ifndef HAVE_ARCH_DMA_SET_MASK
582 static inline int dma_set_mask(struct device *dev, u64 mask)
584 if (!dev->dma_mask || !dma_supported(dev, mask))
587 dma_check_mask(dev, mask);
589 *dev->dma_mask = mask;
594 static inline u64 dma_get_mask(struct device *dev)
596 if (dev && dev->dma_mask && *dev->dma_mask)
597 return *dev->dma_mask;
598 return DMA_BIT_MASK(32);
601 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
602 int dma_set_coherent_mask(struct device *dev, u64 mask);
604 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
606 if (!dma_supported(dev, mask))
609 dma_check_mask(dev, mask);
611 dev->coherent_dma_mask = mask;
617 * Set both the DMA mask and the coherent DMA mask to the same thing.
618 * Note that we don't check the return value from dma_set_coherent_mask()
619 * as the DMA API guarantees that the coherent DMA mask can be set to
620 * the same or smaller than the streaming DMA mask.
622 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
624 int rc = dma_set_mask(dev, mask);
626 dma_set_coherent_mask(dev, mask);
631 * Similar to the above, except it deals with the case where the device
632 * does not have dev->dma_mask appropriately setup.
634 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
636 dev->dma_mask = &dev->coherent_dma_mask;
637 return dma_set_mask_and_coherent(dev, mask);
640 extern u64 dma_get_required_mask(struct device *dev);
642 #ifndef arch_setup_dma_ops
643 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
644 u64 size, const struct iommu_ops *iommu,
648 #ifndef arch_teardown_dma_ops
649 static inline void arch_teardown_dma_ops(struct device *dev) { }
652 static inline unsigned int dma_get_max_seg_size(struct device *dev)
654 if (dev->dma_parms && dev->dma_parms->max_segment_size)
655 return dev->dma_parms->max_segment_size;
659 static inline unsigned int dma_set_max_seg_size(struct device *dev,
662 if (dev->dma_parms) {
663 dev->dma_parms->max_segment_size = size;
669 static inline unsigned long dma_get_seg_boundary(struct device *dev)
671 if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
672 return dev->dma_parms->segment_boundary_mask;
673 return DMA_BIT_MASK(32);
676 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
678 if (dev->dma_parms) {
679 dev->dma_parms->segment_boundary_mask = mask;
686 static inline unsigned long dma_max_pfn(struct device *dev)
688 return *dev->dma_mask >> PAGE_SHIFT;
692 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
693 dma_addr_t *dma_handle, gfp_t flag)
695 void *ret = dma_alloc_coherent(dev, size, dma_handle,
700 #ifdef CONFIG_HAS_DMA
701 static inline int dma_get_cache_alignment(void)
703 #ifdef ARCH_DMA_MINALIGN
704 return ARCH_DMA_MINALIGN;
710 /* flags for the coherent memory api */
711 #define DMA_MEMORY_EXCLUSIVE 0x01
713 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
714 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
715 dma_addr_t device_addr, size_t size, int flags);
716 void dma_release_declared_memory(struct device *dev);
717 void *dma_mark_declared_memory_occupied(struct device *dev,
718 dma_addr_t device_addr, size_t size);
721 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
722 dma_addr_t device_addr, size_t size, int flags)
728 dma_release_declared_memory(struct device *dev)
733 dma_mark_declared_memory_occupied(struct device *dev,
734 dma_addr_t device_addr, size_t size)
736 return ERR_PTR(-EBUSY);
738 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
740 #ifdef CONFIG_HAS_DMA
741 int dma_configure(struct device *dev);
742 void dma_deconfigure(struct device *dev);
744 static inline int dma_configure(struct device *dev)
749 static inline void dma_deconfigure(struct device *dev) {}
755 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
756 dma_addr_t *dma_handle, gfp_t gfp);
757 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
758 dma_addr_t dma_handle);
759 extern void *dmam_alloc_attrs(struct device *dev, size_t size,
760 dma_addr_t *dma_handle, gfp_t gfp,
761 unsigned long attrs);
762 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
763 extern int dmam_declare_coherent_memory(struct device *dev,
764 phys_addr_t phys_addr,
765 dma_addr_t device_addr, size_t size,
767 extern void dmam_release_declared_memory(struct device *dev);
768 #else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
769 static inline int dmam_declare_coherent_memory(struct device *dev,
770 phys_addr_t phys_addr, dma_addr_t device_addr,
771 size_t size, gfp_t gfp)
776 static inline void dmam_release_declared_memory(struct device *dev)
779 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
781 static inline void *dma_alloc_wc(struct device *dev, size_t size,
782 dma_addr_t *dma_addr, gfp_t gfp)
784 return dma_alloc_attrs(dev, size, dma_addr, gfp,
785 DMA_ATTR_WRITE_COMBINE);
787 #ifndef dma_alloc_writecombine
788 #define dma_alloc_writecombine dma_alloc_wc
791 static inline void dma_free_wc(struct device *dev, size_t size,
792 void *cpu_addr, dma_addr_t dma_addr)
794 return dma_free_attrs(dev, size, cpu_addr, dma_addr,
795 DMA_ATTR_WRITE_COMBINE);
797 #ifndef dma_free_writecombine
798 #define dma_free_writecombine dma_free_wc
801 static inline int dma_mmap_wc(struct device *dev,
802 struct vm_area_struct *vma,
803 void *cpu_addr, dma_addr_t dma_addr,
806 return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
807 DMA_ATTR_WRITE_COMBINE);
809 #ifndef dma_mmap_writecombine
810 #define dma_mmap_writecombine dma_mmap_wc
813 #if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
814 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
815 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
816 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
817 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
818 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
819 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
821 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
822 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
823 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
824 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
825 #define dma_unmap_len(PTR, LEN_NAME) (0)
826 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)