1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Takashi Iwai <tiwai@suse.de>
6 * Generic memory allocators
9 #include <linux/slab.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/dma-map-ops.h>
13 #include <linux/genalloc.h>
14 #include <linux/highmem.h>
15 #include <linux/vmalloc.h>
17 #include <asm/set_memory.h>
19 #include <sound/memalloc.h>
20 #include "memalloc_local.h"
24 __GFP_COMP | /* compound page lets parts be mapped */ \
25 __GFP_RETRY_MAYFAIL | /* don't trigger OOM-killer */ \
26 __GFP_NOWARN) /* no stack trace print - this call is non-critical */
28 static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab);
30 #ifdef CONFIG_SND_DMA_SGBUF
31 static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size);
34 static void *__snd_dma_alloc_pages(struct snd_dma_buffer *dmab, size_t size)
36 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
38 if (WARN_ON_ONCE(!ops || !ops->alloc))
40 return ops->alloc(dmab, size);
44 * snd_dma_alloc_dir_pages - allocate the buffer area according to the given
46 * @type: the DMA buffer type
47 * @device: the device pointer
49 * @size: the buffer size to allocate
50 * @dmab: buffer allocation record to store the allocated data
52 * Calls the memory-allocator function for the corresponding
55 * Return: Zero if the buffer with the given size is allocated successfully,
56 * otherwise a negative value on error.
58 int snd_dma_alloc_dir_pages(int type, struct device *device,
59 enum dma_data_direction dir, size_t size,
60 struct snd_dma_buffer *dmab)
67 size = PAGE_ALIGN(size);
68 dmab->dev.type = type;
69 dmab->dev.dev = device;
73 dmab->private_data = NULL;
74 dmab->area = __snd_dma_alloc_pages(dmab, size);
80 EXPORT_SYMBOL(snd_dma_alloc_dir_pages);
83 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
84 * @type: the DMA buffer type
85 * @device: the device pointer
86 * @size: the buffer size to allocate
87 * @dmab: buffer allocation record to store the allocated data
89 * Calls the memory-allocator function for the corresponding
90 * buffer type. When no space is left, this function reduces the size and
91 * tries to allocate again. The size actually allocated is stored in
94 * Return: Zero if the buffer with the given size is allocated successfully,
95 * otherwise a negative value on error.
97 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
98 struct snd_dma_buffer *dmab)
102 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
105 if (size <= PAGE_SIZE)
108 size = PAGE_SIZE << get_order(size);
114 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
117 * snd_dma_free_pages - release the allocated buffer
118 * @dmab: the buffer allocation record to release
120 * Releases the allocated buffer via snd_dma_alloc_pages().
122 void snd_dma_free_pages(struct snd_dma_buffer *dmab)
124 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
126 if (ops && ops->free)
129 EXPORT_SYMBOL(snd_dma_free_pages);
131 /* called by devres */
132 static void __snd_release_pages(struct device *dev, void *res)
134 snd_dma_free_pages(res);
138 * snd_devm_alloc_dir_pages - allocate the buffer and manage with devres
139 * @dev: the device pointer
140 * @type: the DMA buffer type
141 * @dir: DMA direction
142 * @size: the buffer size to allocate
144 * Allocate buffer pages depending on the given type and manage using devres.
145 * The pages will be released automatically at the device removal.
147 * Unlike snd_dma_alloc_pages(), this function requires the real device pointer,
148 * hence it can't work with SNDRV_DMA_TYPE_CONTINUOUS or
149 * SNDRV_DMA_TYPE_VMALLOC type.
151 * Return: the snd_dma_buffer object at success, or NULL if failed
153 struct snd_dma_buffer *
154 snd_devm_alloc_dir_pages(struct device *dev, int type,
155 enum dma_data_direction dir, size_t size)
157 struct snd_dma_buffer *dmab;
160 if (WARN_ON(type == SNDRV_DMA_TYPE_CONTINUOUS ||
161 type == SNDRV_DMA_TYPE_VMALLOC))
164 dmab = devres_alloc(__snd_release_pages, sizeof(*dmab), GFP_KERNEL);
168 err = snd_dma_alloc_dir_pages(type, dev, dir, size, dmab);
174 devres_add(dev, dmab);
177 EXPORT_SYMBOL_GPL(snd_devm_alloc_dir_pages);
180 * snd_dma_buffer_mmap - perform mmap of the given DMA buffer
181 * @dmab: buffer allocation information
182 * @area: VM area information
184 * Return: zero if successful, or a negative error code
186 int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
187 struct vm_area_struct *area)
189 const struct snd_malloc_ops *ops;
193 ops = snd_dma_get_ops(dmab);
194 if (ops && ops->mmap)
195 return ops->mmap(dmab, area);
199 EXPORT_SYMBOL(snd_dma_buffer_mmap);
201 #ifdef CONFIG_HAS_DMA
203 * snd_dma_buffer_sync - sync DMA buffer between CPU and device
204 * @dmab: buffer allocation information
207 void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
208 enum snd_dma_sync_mode mode)
210 const struct snd_malloc_ops *ops;
212 if (!dmab || !dmab->dev.need_sync)
214 ops = snd_dma_get_ops(dmab);
215 if (ops && ops->sync)
216 ops->sync(dmab, mode);
218 EXPORT_SYMBOL_GPL(snd_dma_buffer_sync);
219 #endif /* CONFIG_HAS_DMA */
222 * snd_sgbuf_get_addr - return the physical address at the corresponding offset
223 * @dmab: buffer allocation information
224 * @offset: offset in the ring buffer
226 * Return: the physical address
228 dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset)
230 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
232 if (ops && ops->get_addr)
233 return ops->get_addr(dmab, offset);
235 return dmab->addr + offset;
237 EXPORT_SYMBOL(snd_sgbuf_get_addr);
240 * snd_sgbuf_get_page - return the physical page at the corresponding offset
241 * @dmab: buffer allocation information
242 * @offset: offset in the ring buffer
244 * Return: the page pointer
246 struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset)
248 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
250 if (ops && ops->get_page)
251 return ops->get_page(dmab, offset);
253 return virt_to_page(dmab->area + offset);
255 EXPORT_SYMBOL(snd_sgbuf_get_page);
258 * snd_sgbuf_get_chunk_size - compute the max chunk size with continuous pages
260 * @dmab: buffer allocation information
261 * @ofs: offset in the ring buffer
262 * @size: the requested size
264 * Return: the chunk size
266 unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
267 unsigned int ofs, unsigned int size)
269 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
271 if (ops && ops->get_chunk_size)
272 return ops->get_chunk_size(dmab, ofs, size);
276 EXPORT_SYMBOL(snd_sgbuf_get_chunk_size);
279 * Continuous pages allocator
281 static void *do_alloc_pages(struct device *dev, size_t size, dma_addr_t *addr,
285 gfp_t gfp = GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
288 p = alloc_pages_exact(size, gfp);
291 *addr = page_to_phys(virt_to_page(p));
294 if ((*addr + size - 1) & ~dev->coherent_dma_mask) {
295 if (IS_ENABLED(CONFIG_ZONE_DMA32) && !(gfp & GFP_DMA32)) {
299 if (IS_ENABLED(CONFIG_ZONE_DMA) && !(gfp & GFP_DMA)) {
300 gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
306 set_memory_wc((unsigned long)(p), size >> PAGE_SHIFT);
311 static void do_free_pages(void *p, size_t size, bool wc)
315 set_memory_wb((unsigned long)(p), size >> PAGE_SHIFT);
317 free_pages_exact(p, size);
321 static void *snd_dma_continuous_alloc(struct snd_dma_buffer *dmab, size_t size)
323 return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, false);
326 static void snd_dma_continuous_free(struct snd_dma_buffer *dmab)
328 do_free_pages(dmab->area, dmab->bytes, false);
331 static int snd_dma_continuous_mmap(struct snd_dma_buffer *dmab,
332 struct vm_area_struct *area)
334 return remap_pfn_range(area, area->vm_start,
335 dmab->addr >> PAGE_SHIFT,
336 area->vm_end - area->vm_start,
340 static const struct snd_malloc_ops snd_dma_continuous_ops = {
341 .alloc = snd_dma_continuous_alloc,
342 .free = snd_dma_continuous_free,
343 .mmap = snd_dma_continuous_mmap,
349 static void *snd_dma_vmalloc_alloc(struct snd_dma_buffer *dmab, size_t size)
351 return vmalloc(size);
354 static void snd_dma_vmalloc_free(struct snd_dma_buffer *dmab)
359 static int snd_dma_vmalloc_mmap(struct snd_dma_buffer *dmab,
360 struct vm_area_struct *area)
362 return remap_vmalloc_range(area, dmab->area, 0);
365 #define get_vmalloc_page_addr(dmab, offset) \
366 page_to_phys(vmalloc_to_page((dmab)->area + (offset)))
368 static dma_addr_t snd_dma_vmalloc_get_addr(struct snd_dma_buffer *dmab,
371 return get_vmalloc_page_addr(dmab, offset) + offset % PAGE_SIZE;
374 static struct page *snd_dma_vmalloc_get_page(struct snd_dma_buffer *dmab,
377 return vmalloc_to_page(dmab->area + offset);
381 snd_dma_vmalloc_get_chunk_size(struct snd_dma_buffer *dmab,
382 unsigned int ofs, unsigned int size)
384 unsigned int start, end;
387 start = ALIGN_DOWN(ofs, PAGE_SIZE);
388 end = ofs + size - 1; /* the last byte address */
389 /* check page continuity */
390 addr = get_vmalloc_page_addr(dmab, start);
396 if (get_vmalloc_page_addr(dmab, start) != addr)
399 /* ok, all on continuous pages */
403 static const struct snd_malloc_ops snd_dma_vmalloc_ops = {
404 .alloc = snd_dma_vmalloc_alloc,
405 .free = snd_dma_vmalloc_free,
406 .mmap = snd_dma_vmalloc_mmap,
407 .get_addr = snd_dma_vmalloc_get_addr,
408 .get_page = snd_dma_vmalloc_get_page,
409 .get_chunk_size = snd_dma_vmalloc_get_chunk_size,
412 #ifdef CONFIG_HAS_DMA
416 #ifdef CONFIG_GENERIC_ALLOCATOR
417 static void *snd_dma_iram_alloc(struct snd_dma_buffer *dmab, size_t size)
419 struct device *dev = dmab->dev.dev;
420 struct gen_pool *pool;
424 pool = of_gen_pool_get(dev->of_node, "iram", 0);
425 /* Assign the pool into private_data field */
426 dmab->private_data = pool;
428 p = gen_pool_dma_alloc_align(pool, size, &dmab->addr, PAGE_SIZE);
433 /* Internal memory might have limited size and no enough space,
434 * so if we fail to malloc, try to fetch memory traditionally.
436 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
437 return __snd_dma_alloc_pages(dmab, size);
440 static void snd_dma_iram_free(struct snd_dma_buffer *dmab)
442 struct gen_pool *pool = dmab->private_data;
444 if (pool && dmab->area)
445 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
448 static int snd_dma_iram_mmap(struct snd_dma_buffer *dmab,
449 struct vm_area_struct *area)
451 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
452 return remap_pfn_range(area, area->vm_start,
453 dmab->addr >> PAGE_SHIFT,
454 area->vm_end - area->vm_start,
458 static const struct snd_malloc_ops snd_dma_iram_ops = {
459 .alloc = snd_dma_iram_alloc,
460 .free = snd_dma_iram_free,
461 .mmap = snd_dma_iram_mmap,
463 #endif /* CONFIG_GENERIC_ALLOCATOR */
466 * Coherent device pages allocator
468 static void *snd_dma_dev_alloc(struct snd_dma_buffer *dmab, size_t size)
470 return dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);
473 static void snd_dma_dev_free(struct snd_dma_buffer *dmab)
475 dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
478 static int snd_dma_dev_mmap(struct snd_dma_buffer *dmab,
479 struct vm_area_struct *area)
481 return dma_mmap_coherent(dmab->dev.dev, area,
482 dmab->area, dmab->addr, dmab->bytes);
485 static const struct snd_malloc_ops snd_dma_dev_ops = {
486 .alloc = snd_dma_dev_alloc,
487 .free = snd_dma_dev_free,
488 .mmap = snd_dma_dev_mmap,
492 * Write-combined pages
494 /* x86-specific allocations */
495 #ifdef CONFIG_SND_DMA_SGBUF
496 static void *snd_dma_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
498 return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, true);
501 static void snd_dma_wc_free(struct snd_dma_buffer *dmab)
503 do_free_pages(dmab->area, dmab->bytes, true);
506 static int snd_dma_wc_mmap(struct snd_dma_buffer *dmab,
507 struct vm_area_struct *area)
509 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
510 return snd_dma_continuous_mmap(dmab, area);
513 static void *snd_dma_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
515 return dma_alloc_wc(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);
518 static void snd_dma_wc_free(struct snd_dma_buffer *dmab)
520 dma_free_wc(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
523 static int snd_dma_wc_mmap(struct snd_dma_buffer *dmab,
524 struct vm_area_struct *area)
526 return dma_mmap_wc(dmab->dev.dev, area,
527 dmab->area, dmab->addr, dmab->bytes);
529 #endif /* CONFIG_SND_DMA_SGBUF */
531 static const struct snd_malloc_ops snd_dma_wc_ops = {
532 .alloc = snd_dma_wc_alloc,
533 .free = snd_dma_wc_free,
534 .mmap = snd_dma_wc_mmap,
538 * Non-contiguous pages allocator
540 static void *snd_dma_noncontig_alloc(struct snd_dma_buffer *dmab, size_t size)
542 struct sg_table *sgt;
545 sgt = dma_alloc_noncontiguous(dmab->dev.dev, size, dmab->dev.dir,
547 #ifdef CONFIG_SND_DMA_SGBUF
548 if (!sgt && !get_dma_ops(dmab->dev.dev)) {
549 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)
550 dmab->dev.type = SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK;
552 dmab->dev.type = SNDRV_DMA_TYPE_DEV_SG_FALLBACK;
553 return snd_dma_sg_fallback_alloc(dmab, size);
559 dmab->dev.need_sync = dma_need_sync(dmab->dev.dev,
560 sg_dma_address(sgt->sgl));
561 p = dma_vmap_noncontiguous(dmab->dev.dev, size, sgt);
563 dmab->private_data = sgt;
564 /* store the first page address for convenience */
565 dmab->addr = snd_sgbuf_get_addr(dmab, 0);
567 dma_free_noncontiguous(dmab->dev.dev, size, sgt, dmab->dev.dir);
572 static void snd_dma_noncontig_free(struct snd_dma_buffer *dmab)
574 dma_vunmap_noncontiguous(dmab->dev.dev, dmab->area);
575 dma_free_noncontiguous(dmab->dev.dev, dmab->bytes, dmab->private_data,
579 static int snd_dma_noncontig_mmap(struct snd_dma_buffer *dmab,
580 struct vm_area_struct *area)
582 return dma_mmap_noncontiguous(dmab->dev.dev, area,
583 dmab->bytes, dmab->private_data);
586 static void snd_dma_noncontig_sync(struct snd_dma_buffer *dmab,
587 enum snd_dma_sync_mode mode)
589 if (mode == SNDRV_DMA_SYNC_CPU) {
590 if (dmab->dev.dir == DMA_TO_DEVICE)
592 invalidate_kernel_vmap_range(dmab->area, dmab->bytes);
593 dma_sync_sgtable_for_cpu(dmab->dev.dev, dmab->private_data,
596 if (dmab->dev.dir == DMA_FROM_DEVICE)
598 flush_kernel_vmap_range(dmab->area, dmab->bytes);
599 dma_sync_sgtable_for_device(dmab->dev.dev, dmab->private_data,
604 static inline void snd_dma_noncontig_iter_set(struct snd_dma_buffer *dmab,
605 struct sg_page_iter *piter,
608 struct sg_table *sgt = dmab->private_data;
610 __sg_page_iter_start(piter, sgt->sgl, sgt->orig_nents,
611 offset >> PAGE_SHIFT);
614 static dma_addr_t snd_dma_noncontig_get_addr(struct snd_dma_buffer *dmab,
617 struct sg_dma_page_iter iter;
619 snd_dma_noncontig_iter_set(dmab, &iter.base, offset);
620 __sg_page_iter_dma_next(&iter);
621 return sg_page_iter_dma_address(&iter) + offset % PAGE_SIZE;
624 static struct page *snd_dma_noncontig_get_page(struct snd_dma_buffer *dmab,
627 struct sg_page_iter iter;
629 snd_dma_noncontig_iter_set(dmab, &iter, offset);
630 __sg_page_iter_next(&iter);
631 return sg_page_iter_page(&iter);
635 snd_dma_noncontig_get_chunk_size(struct snd_dma_buffer *dmab,
636 unsigned int ofs, unsigned int size)
638 struct sg_dma_page_iter iter;
639 unsigned int start, end;
642 start = ALIGN_DOWN(ofs, PAGE_SIZE);
643 end = ofs + size - 1; /* the last byte address */
644 snd_dma_noncontig_iter_set(dmab, &iter.base, start);
645 if (!__sg_page_iter_dma_next(&iter))
647 /* check page continuity */
648 addr = sg_page_iter_dma_address(&iter);
654 if (!__sg_page_iter_dma_next(&iter) ||
655 sg_page_iter_dma_address(&iter) != addr)
658 /* ok, all on continuous pages */
662 static const struct snd_malloc_ops snd_dma_noncontig_ops = {
663 .alloc = snd_dma_noncontig_alloc,
664 .free = snd_dma_noncontig_free,
665 .mmap = snd_dma_noncontig_mmap,
666 .sync = snd_dma_noncontig_sync,
667 .get_addr = snd_dma_noncontig_get_addr,
668 .get_page = snd_dma_noncontig_get_page,
669 .get_chunk_size = snd_dma_noncontig_get_chunk_size,
672 /* x86-specific SG-buffer with WC pages */
673 #ifdef CONFIG_SND_DMA_SGBUF
674 #define sg_wc_address(it) ((unsigned long)page_address(sg_page_iter_page(it)))
676 static void *snd_dma_sg_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
678 void *p = snd_dma_noncontig_alloc(dmab, size);
679 struct sg_table *sgt = dmab->private_data;
680 struct sg_page_iter iter;
684 if (dmab->dev.type != SNDRV_DMA_TYPE_DEV_WC_SG)
686 for_each_sgtable_page(sgt, &iter, 0)
687 set_memory_wc(sg_wc_address(&iter), 1);
691 static void snd_dma_sg_wc_free(struct snd_dma_buffer *dmab)
693 struct sg_table *sgt = dmab->private_data;
694 struct sg_page_iter iter;
696 for_each_sgtable_page(sgt, &iter, 0)
697 set_memory_wb(sg_wc_address(&iter), 1);
698 snd_dma_noncontig_free(dmab);
701 static int snd_dma_sg_wc_mmap(struct snd_dma_buffer *dmab,
702 struct vm_area_struct *area)
704 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
705 return dma_mmap_noncontiguous(dmab->dev.dev, area,
706 dmab->bytes, dmab->private_data);
709 static const struct snd_malloc_ops snd_dma_sg_wc_ops = {
710 .alloc = snd_dma_sg_wc_alloc,
711 .free = snd_dma_sg_wc_free,
712 .mmap = snd_dma_sg_wc_mmap,
713 .sync = snd_dma_noncontig_sync,
714 .get_addr = snd_dma_noncontig_get_addr,
715 .get_page = snd_dma_noncontig_get_page,
716 .get_chunk_size = snd_dma_noncontig_get_chunk_size,
719 /* Fallback SG-buffer allocations for x86 */
720 struct snd_dma_sg_fallback {
726 static void __snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab,
727 struct snd_dma_sg_fallback *sgbuf)
729 bool wc = dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK;
732 for (i = 0; i < sgbuf->count && sgbuf->pages[i]; i++)
733 do_free_pages(page_address(sgbuf->pages[i]), PAGE_SIZE, wc);
734 kvfree(sgbuf->pages);
735 kvfree(sgbuf->addrs);
739 static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size)
741 struct snd_dma_sg_fallback *sgbuf;
745 bool wc = dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK;
747 sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL);
750 count = PAGE_ALIGN(size) >> PAGE_SHIFT;
751 pages = kvcalloc(count, sizeof(*pages), GFP_KERNEL);
754 sgbuf->pages = pages;
755 sgbuf->addrs = kvcalloc(count, sizeof(*sgbuf->addrs), GFP_KERNEL);
759 for (i = 0; i < count; sgbuf->count++, i++) {
760 p = do_alloc_pages(dmab->dev.dev, PAGE_SIZE, &sgbuf->addrs[i], wc);
763 sgbuf->pages[i] = virt_to_page(p);
766 p = vmap(pages, count, VM_MAP, PAGE_KERNEL);
769 dmab->private_data = sgbuf;
770 /* store the first page address for convenience */
771 dmab->addr = snd_sgbuf_get_addr(dmab, 0);
775 __snd_dma_sg_fallback_free(dmab, sgbuf);
779 static void snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab)
782 __snd_dma_sg_fallback_free(dmab, dmab->private_data);
785 static int snd_dma_sg_fallback_mmap(struct snd_dma_buffer *dmab,
786 struct vm_area_struct *area)
788 struct snd_dma_sg_fallback *sgbuf = dmab->private_data;
790 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
791 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
792 return vm_map_pages(area, sgbuf->pages, sgbuf->count);
795 static const struct snd_malloc_ops snd_dma_sg_fallback_ops = {
796 .alloc = snd_dma_sg_fallback_alloc,
797 .free = snd_dma_sg_fallback_free,
798 .mmap = snd_dma_sg_fallback_mmap,
799 /* reuse vmalloc helpers */
800 .get_addr = snd_dma_vmalloc_get_addr,
801 .get_page = snd_dma_vmalloc_get_page,
802 .get_chunk_size = snd_dma_vmalloc_get_chunk_size,
804 #endif /* CONFIG_SND_DMA_SGBUF */
807 * Non-coherent pages allocator
809 static void *snd_dma_noncoherent_alloc(struct snd_dma_buffer *dmab, size_t size)
813 p = dma_alloc_noncoherent(dmab->dev.dev, size, &dmab->addr,
814 dmab->dev.dir, DEFAULT_GFP);
816 dmab->dev.need_sync = dma_need_sync(dmab->dev.dev, dmab->addr);
820 static void snd_dma_noncoherent_free(struct snd_dma_buffer *dmab)
822 dma_free_noncoherent(dmab->dev.dev, dmab->bytes, dmab->area,
823 dmab->addr, dmab->dev.dir);
826 static int snd_dma_noncoherent_mmap(struct snd_dma_buffer *dmab,
827 struct vm_area_struct *area)
829 area->vm_page_prot = vm_get_page_prot(area->vm_flags);
830 return dma_mmap_pages(dmab->dev.dev, area,
831 area->vm_end - area->vm_start,
832 virt_to_page(dmab->area));
835 static void snd_dma_noncoherent_sync(struct snd_dma_buffer *dmab,
836 enum snd_dma_sync_mode mode)
838 if (mode == SNDRV_DMA_SYNC_CPU) {
839 if (dmab->dev.dir != DMA_TO_DEVICE)
840 dma_sync_single_for_cpu(dmab->dev.dev, dmab->addr,
841 dmab->bytes, dmab->dev.dir);
843 if (dmab->dev.dir != DMA_FROM_DEVICE)
844 dma_sync_single_for_device(dmab->dev.dev, dmab->addr,
845 dmab->bytes, dmab->dev.dir);
849 static const struct snd_malloc_ops snd_dma_noncoherent_ops = {
850 .alloc = snd_dma_noncoherent_alloc,
851 .free = snd_dma_noncoherent_free,
852 .mmap = snd_dma_noncoherent_mmap,
853 .sync = snd_dma_noncoherent_sync,
856 #endif /* CONFIG_HAS_DMA */
861 static const struct snd_malloc_ops *snd_dma_ops[] = {
862 [SNDRV_DMA_TYPE_CONTINUOUS] = &snd_dma_continuous_ops,
863 [SNDRV_DMA_TYPE_VMALLOC] = &snd_dma_vmalloc_ops,
864 #ifdef CONFIG_HAS_DMA
865 [SNDRV_DMA_TYPE_DEV] = &snd_dma_dev_ops,
866 [SNDRV_DMA_TYPE_DEV_WC] = &snd_dma_wc_ops,
867 [SNDRV_DMA_TYPE_NONCONTIG] = &snd_dma_noncontig_ops,
868 [SNDRV_DMA_TYPE_NONCOHERENT] = &snd_dma_noncoherent_ops,
869 #ifdef CONFIG_SND_DMA_SGBUF
870 [SNDRV_DMA_TYPE_DEV_WC_SG] = &snd_dma_sg_wc_ops,
872 #ifdef CONFIG_GENERIC_ALLOCATOR
873 [SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops,
874 #endif /* CONFIG_GENERIC_ALLOCATOR */
875 #ifdef CONFIG_SND_DMA_SGBUF
876 [SNDRV_DMA_TYPE_DEV_SG_FALLBACK] = &snd_dma_sg_fallback_ops,
877 [SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK] = &snd_dma_sg_fallback_ops,
879 #endif /* CONFIG_HAS_DMA */
882 static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab)
884 if (WARN_ON_ONCE(!dmab))
886 if (WARN_ON_ONCE(dmab->dev.type <= SNDRV_DMA_TYPE_UNKNOWN ||
887 dmab->dev.type >= ARRAY_SIZE(snd_dma_ops)))
889 return snd_dma_ops[dmab->dev.type];