1 // SPDX-License-Identifier: GPL-2.0-or-later
11 #include <linux/dma-mapping.h>
12 #include <linux/dma-map-ops.h>
25 	 __GFP_RETRY_MAYFAIL | /* don't trigger OOM-killer */ \
26 	 __GFP_NOWARN)   /* no stack trace print - this call is non-critical */
38 	if (WARN_ON_ONCE(!ops || !ops->alloc))  in __snd_dma_alloc_pages()
40 	return ops->alloc(dmab, size);  in __snd_dma_alloc_pages()
44  * snd_dma_alloc_dir_pages - allocate the buffer area according to the given
52  * Calls the memory-allocator function for the corresponding
63 		return -ENXIO;  in snd_dma_alloc_dir_pages()
65 		return -ENXIO;  in snd_dma_alloc_dir_pages()
68 	dmab->dev.type = type;  in snd_dma_alloc_dir_pages()
69 	dmab->dev.dev = device;  in snd_dma_alloc_dir_pages()
70 	dmab->dev.dir = dir;  in snd_dma_alloc_dir_pages()
71 	dmab->bytes = 0;  in snd_dma_alloc_dir_pages()
72 	dmab->addr = 0;  in snd_dma_alloc_dir_pages()
73 	dmab->private_data = NULL;  in snd_dma_alloc_dir_pages()
74 	dmab->area = __snd_dma_alloc_pages(dmab, size);  in snd_dma_alloc_dir_pages()
75 	if (!dmab->area)  in snd_dma_alloc_dir_pages()
76 		return -ENOMEM;  in snd_dma_alloc_dir_pages()
77 	dmab->bytes = size;  in snd_dma_alloc_dir_pages()
83  * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
89  * Calls the memory-allocator function for the corresponding
103 		if (err != -ENOMEM)  in snd_dma_alloc_pages_fallback()
106 			return -ENOMEM;  in snd_dma_alloc_pages_fallback()
110 	if (! dmab->area)  in snd_dma_alloc_pages_fallback()
111 		return -ENOMEM;  in snd_dma_alloc_pages_fallback()
117  * snd_dma_free_pages - release the allocated buffer
126 	if (ops && ops->free)  in snd_dma_free_pages()
127 		ops->free(dmab);  in snd_dma_free_pages()
138  * snd_devm_alloc_dir_pages - allocate the buffer and manage with devres
180  * snd_dma_buffer_mmap - perform mmap of the given DMA buffer
192 		return -ENOENT;  in snd_dma_buffer_mmap()
194 	if (ops && ops->mmap)  in snd_dma_buffer_mmap()
195 		return ops->mmap(dmab, area);  in snd_dma_buffer_mmap()
197 		return -ENOENT;  in snd_dma_buffer_mmap()
203  * snd_dma_buffer_sync - sync DMA buffer between CPU and device
212 	if (!dmab || !dmab->dev.need_sync)  in snd_dma_buffer_sync()
215 	if (ops && ops->sync)  in snd_dma_buffer_sync()
216 		ops->sync(dmab, mode);  in snd_dma_buffer_sync()
222  * snd_sgbuf_get_addr - return the physical address at the corresponding offset
232 	if (ops && ops->get_addr)  in snd_sgbuf_get_addr()
233 		return ops->get_addr(dmab, offset);  in snd_sgbuf_get_addr()
235 		return dmab->addr + offset;  in snd_sgbuf_get_addr()
240  * snd_sgbuf_get_page - return the physical page at the corresponding offset
250 	if (ops && ops->get_page)  in snd_sgbuf_get_page()
251 		return ops->get_page(dmab, offset);  in snd_sgbuf_get_page()
253 		return virt_to_page(dmab->area + offset);  in snd_sgbuf_get_page()
258  * snd_sgbuf_get_chunk_size - compute the max chunk size with continuous pages
259  *	on sg-buffer
271 	if (ops && ops->get_chunk_size)  in snd_sgbuf_get_chunk_size()
272 		return ops->get_chunk_size(dmab, ofs, size);  in snd_sgbuf_get_chunk_size()
279  * Continuous pages allocator
294 	if ((*addr + size - 1) & ~dev->coherent_dma_mask) {  in do_alloc_pages()
323 	return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, false);  in snd_dma_continuous_alloc()
328 	do_free_pages(dmab->area, dmab->bytes, false);  in snd_dma_continuous_free()
334 	return remap_pfn_range(area, area->vm_start,  in snd_dma_continuous_mmap()
335 			       dmab->addr >> PAGE_SHIFT,  in snd_dma_continuous_mmap()
336 			       area->vm_end - area->vm_start,  in snd_dma_continuous_mmap()
337 			       area->vm_page_prot);  in snd_dma_continuous_mmap()
356 	vfree(dmab->area);  in snd_dma_vmalloc_free()
362 	return remap_vmalloc_range(area, dmab->area, 0);  in snd_dma_vmalloc_mmap()
366 	page_to_phys(vmalloc_to_page((dmab)->area + (offset)))
377 	return vmalloc_to_page(dmab->area + offset);  in snd_dma_vmalloc_get_page()
388 	end = ofs + size - 1; /* the last byte address */  in snd_dma_vmalloc_get_chunk_size()
397 			return start - ofs;  in snd_dma_vmalloc_get_chunk_size()
399 	/* ok, all on continuous pages */  in snd_dma_vmalloc_get_chunk_size()
419 	struct device *dev = dmab->dev.dev;  in snd_dma_iram_alloc()
423 	if (dev->of_node) {  in snd_dma_iram_alloc()
424 		pool = of_gen_pool_get(dev->of_node, "iram", 0);  in snd_dma_iram_alloc()
426 		dmab->private_data = pool;  in snd_dma_iram_alloc()
428 		p = gen_pool_dma_alloc_align(pool, size, &dmab->addr, PAGE_SIZE);  in snd_dma_iram_alloc()
436 	dmab->dev.type = SNDRV_DMA_TYPE_DEV;  in snd_dma_iram_alloc()
442 	struct gen_pool *pool = dmab->private_data;  in snd_dma_iram_free()
444 	if (pool && dmab->area)  in snd_dma_iram_free()
445 		gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);  in snd_dma_iram_free()
451 	area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);  in snd_dma_iram_mmap()
452 	return remap_pfn_range(area, area->vm_start,  in snd_dma_iram_mmap()
453 			       dmab->addr >> PAGE_SHIFT,  in snd_dma_iram_mmap()
454 			       area->vm_end - area->vm_start,  in snd_dma_iram_mmap()
455 			       area->vm_page_prot);  in snd_dma_iram_mmap()
470 	return dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);  in snd_dma_dev_alloc()
475 	dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);  in snd_dma_dev_free()
481 	return dma_mmap_coherent(dmab->dev.dev, area,  in snd_dma_dev_mmap()
482 				 dmab->area, dmab->addr, dmab->bytes);  in snd_dma_dev_mmap()
492  * Write-combined pages
494 /* x86-specific allocations */
498 	return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, true);  in snd_dma_wc_alloc()
503 	do_free_pages(dmab->area, dmab->bytes, true);  in snd_dma_wc_free()
509 	area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);  in snd_dma_wc_mmap()
515 	return dma_alloc_wc(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);  in snd_dma_wc_alloc()
520 	dma_free_wc(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);  in snd_dma_wc_free()
526 	return dma_mmap_wc(dmab->dev.dev, area,  in snd_dma_wc_mmap()
527 			   dmab->area, dmab->addr, dmab->bytes);  in snd_dma_wc_mmap()
538  * Non-contiguous pages allocator
545 	sgt = dma_alloc_noncontiguous(dmab->dev.dev, size, dmab->dev.dir,  in snd_dma_noncontig_alloc()
548 	if (!sgt && !get_dma_ops(dmab->dev.dev)) {  in snd_dma_noncontig_alloc()
549 		if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)  in snd_dma_noncontig_alloc()
550 			dmab->dev.type = SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK;  in snd_dma_noncontig_alloc()
552 			dmab->dev.type = SNDRV_DMA_TYPE_DEV_SG_FALLBACK;  in snd_dma_noncontig_alloc()
559 	dmab->dev.need_sync = dma_need_sync(dmab->dev.dev,  in snd_dma_noncontig_alloc()
560 					    sg_dma_address(sgt->sgl));  in snd_dma_noncontig_alloc()
561 	p = dma_vmap_noncontiguous(dmab->dev.dev, size, sgt);  in snd_dma_noncontig_alloc()
563 		dmab->private_data = sgt;  in snd_dma_noncontig_alloc()
565 		dmab->addr = snd_sgbuf_get_addr(dmab, 0);  in snd_dma_noncontig_alloc()
567 		dma_free_noncontiguous(dmab->dev.dev, size, sgt, dmab->dev.dir);  in snd_dma_noncontig_alloc()
574 	dma_vunmap_noncontiguous(dmab->dev.dev, dmab->area);  in snd_dma_noncontig_free()
575 	dma_free_noncontiguous(dmab->dev.dev, dmab->bytes, dmab->private_data,  in snd_dma_noncontig_free()
576 			       dmab->dev.dir);  in snd_dma_noncontig_free()
582 	return dma_mmap_noncontiguous(dmab->dev.dev, area,  in snd_dma_noncontig_mmap()
583 				      dmab->bytes, dmab->private_data);  in snd_dma_noncontig_mmap()
590 		if (dmab->dev.dir == DMA_TO_DEVICE)  in snd_dma_noncontig_sync()
592 		invalidate_kernel_vmap_range(dmab->area, dmab->bytes);  in snd_dma_noncontig_sync()
593 		dma_sync_sgtable_for_cpu(dmab->dev.dev, dmab->private_data,  in snd_dma_noncontig_sync()
594 					 dmab->dev.dir);  in snd_dma_noncontig_sync()
596 		if (dmab->dev.dir == DMA_FROM_DEVICE)  in snd_dma_noncontig_sync()
598 		flush_kernel_vmap_range(dmab->area, dmab->bytes);  in snd_dma_noncontig_sync()
599 		dma_sync_sgtable_for_device(dmab->dev.dev, dmab->private_data,  in snd_dma_noncontig_sync()
600 					    dmab->dev.dir);  in snd_dma_noncontig_sync()
608 	struct sg_table *sgt = dmab->private_data;  in snd_dma_noncontig_iter_set()
610 	__sg_page_iter_start(piter, sgt->sgl, sgt->orig_nents,  in snd_dma_noncontig_iter_set()
643 	end = ofs + size - 1; /* the last byte address */  in snd_dma_noncontig_get_chunk_size()
656 			return start - ofs;  in snd_dma_noncontig_get_chunk_size()
658 	/* ok, all on continuous pages */  in snd_dma_noncontig_get_chunk_size()
672 /* x86-specific SG-buffer with WC pages */
679 	struct sg_table *sgt = dmab->private_data;  in snd_dma_sg_wc_alloc()
684 	if (dmab->dev.type != SNDRV_DMA_TYPE_DEV_WC_SG)  in snd_dma_sg_wc_alloc()
693 	struct sg_table *sgt = dmab->private_data;  in snd_dma_sg_wc_free()
704 	area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);  in snd_dma_sg_wc_mmap()
705 	return dma_mmap_noncontiguous(dmab->dev.dev, area,  in snd_dma_sg_wc_mmap()
706 				      dmab->bytes, dmab->private_data);  in snd_dma_sg_wc_mmap()
719 /* Fallback SG-buffer allocations for x86 */
729 	bool wc = dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK;  in __snd_dma_sg_fallback_free()
732 	for (i = 0; i < sgbuf->count && sgbuf->pages[i]; i++)  in __snd_dma_sg_fallback_free()
733 		do_free_pages(page_address(sgbuf->pages[i]), PAGE_SIZE, wc);  in __snd_dma_sg_fallback_free()
734 	kvfree(sgbuf->pages);  in __snd_dma_sg_fallback_free()
735 	kvfree(sgbuf->addrs);  in __snd_dma_sg_fallback_free()
745 	bool wc = dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK;  in snd_dma_sg_fallback_alloc()
754 	sgbuf->pages = pages;  in snd_dma_sg_fallback_alloc()
755 	sgbuf->addrs = kvcalloc(count, sizeof(*sgbuf->addrs), GFP_KERNEL);  in snd_dma_sg_fallback_alloc()
756 	if (!sgbuf->addrs)  in snd_dma_sg_fallback_alloc()
759 	for (i = 0; i < count; sgbuf->count++, i++) {  in snd_dma_sg_fallback_alloc()
760 		p = do_alloc_pages(dmab->dev.dev, PAGE_SIZE, &sgbuf->addrs[i], wc);  in snd_dma_sg_fallback_alloc()
763 		sgbuf->pages[i] = virt_to_page(p);  in snd_dma_sg_fallback_alloc()
769 	dmab->private_data = sgbuf;  in snd_dma_sg_fallback_alloc()
771 	dmab->addr = snd_sgbuf_get_addr(dmab, 0);  in snd_dma_sg_fallback_alloc()
781 	vunmap(dmab->area);  in snd_dma_sg_fallback_free()
782 	__snd_dma_sg_fallback_free(dmab, dmab->private_data);  in snd_dma_sg_fallback_free()
788 	struct snd_dma_sg_fallback *sgbuf = dmab->private_data;  in snd_dma_sg_fallback_mmap()
790 	if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)  in snd_dma_sg_fallback_mmap()
791 		area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);  in snd_dma_sg_fallback_mmap()
792 	return vm_map_pages(area, sgbuf->pages, sgbuf->count);  in snd_dma_sg_fallback_mmap()
807  * Non-coherent pages allocator
813 	p = dma_alloc_noncoherent(dmab->dev.dev, size, &dmab->addr,  in snd_dma_noncoherent_alloc()
814 				  dmab->dev.dir, DEFAULT_GFP);  in snd_dma_noncoherent_alloc()
816 		dmab->dev.need_sync = dma_need_sync(dmab->dev.dev, dmab->addr);  in snd_dma_noncoherent_alloc()
822 	dma_free_noncoherent(dmab->dev.dev, dmab->bytes, dmab->area,  in snd_dma_noncoherent_free()
823 			     dmab->addr, dmab->dev.dir);  in snd_dma_noncoherent_free()
829 	area->vm_page_prot = vm_get_page_prot(area->vm_flags);  in snd_dma_noncoherent_mmap()
830 	return dma_mmap_pages(dmab->dev.dev, area,  in snd_dma_noncoherent_mmap()
831 			      area->vm_end - area->vm_start,  in snd_dma_noncoherent_mmap()
832 			      virt_to_page(dmab->area));  in snd_dma_noncoherent_mmap()
839 		if (dmab->dev.dir != DMA_TO_DEVICE)  in snd_dma_noncoherent_sync()
840 			dma_sync_single_for_cpu(dmab->dev.dev, dmab->addr,  in snd_dma_noncoherent_sync()
841 						dmab->bytes, dmab->dev.dir);  in snd_dma_noncoherent_sync()
843 		if (dmab->dev.dir != DMA_FROM_DEVICE)  in snd_dma_noncoherent_sync()
844 			dma_sync_single_for_device(dmab->dev.dev, dmab->addr,  in snd_dma_noncoherent_sync()
845 						   dmab->bytes, dmab->dev.dir);  in snd_dma_noncoherent_sync()
886 	if (WARN_ON_ONCE(dmab->dev.type <= SNDRV_DMA_TYPE_UNKNOWN ||  in snd_dma_get_ops()
887 			 dmab->dev.type >= ARRAY_SIZE(snd_dma_ops)))  in snd_dma_get_ops()
889 	return snd_dma_ops[dmab->dev.type];  in snd_dma_get_ops()