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890 lines
23 KiB
890 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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* Takashi Iwai <[email protected]> |
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* |
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* Generic memory allocators |
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*/ |
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|
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#include <linux/slab.h> |
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#include <linux/mm.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/dma-map-ops.h> |
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#include <linux/genalloc.h> |
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#include <linux/highmem.h> |
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#include <linux/vmalloc.h> |
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#ifdef CONFIG_X86 |
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#include <asm/set_memory.h> |
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#endif |
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#include <sound/memalloc.h> |
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#include "memalloc_local.h" |
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|
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#define DEFAULT_GFP \ |
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(GFP_KERNEL | \ |
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__GFP_COMP | /* compound page lets parts be mapped */ \ |
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__GFP_RETRY_MAYFAIL | /* don't trigger OOM-killer */ \ |
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__GFP_NOWARN) /* no stack trace print - this call is non-critical */ |
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|
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static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab); |
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#ifdef CONFIG_SND_DMA_SGBUF |
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static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size); |
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#endif |
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static void *__snd_dma_alloc_pages(struct snd_dma_buffer *dmab, size_t size) |
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{ |
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab); |
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|
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if (WARN_ON_ONCE(!ops || !ops->alloc)) |
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return NULL; |
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return ops->alloc(dmab, size); |
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} |
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|
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/** |
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* snd_dma_alloc_dir_pages - allocate the buffer area according to the given |
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* type and direction |
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* @type: the DMA buffer type |
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* @device: the device pointer |
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* @dir: DMA direction |
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* @size: the buffer size to allocate |
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* @dmab: buffer allocation record to store the allocated data |
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* |
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* Calls the memory-allocator function for the corresponding |
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* buffer type. |
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* |
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* Return: Zero if the buffer with the given size is allocated successfully, |
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* otherwise a negative value on error. |
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*/ |
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int snd_dma_alloc_dir_pages(int type, struct device *device, |
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enum dma_data_direction dir, size_t size, |
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struct snd_dma_buffer *dmab) |
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{ |
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if (WARN_ON(!size)) |
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return -ENXIO; |
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if (WARN_ON(!dmab)) |
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return -ENXIO; |
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size = PAGE_ALIGN(size); |
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dmab->dev.type = type; |
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dmab->dev.dev = device; |
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dmab->dev.dir = dir; |
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dmab->bytes = 0; |
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dmab->addr = 0; |
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dmab->private_data = NULL; |
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dmab->area = __snd_dma_alloc_pages(dmab, size); |
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if (!dmab->area) |
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return -ENOMEM; |
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dmab->bytes = size; |
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return 0; |
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} |
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EXPORT_SYMBOL(snd_dma_alloc_dir_pages); |
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|
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/** |
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* snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback |
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* @type: the DMA buffer type |
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* @device: the device pointer |
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* @size: the buffer size to allocate |
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* @dmab: buffer allocation record to store the allocated data |
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* |
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* Calls the memory-allocator function for the corresponding |
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* buffer type. When no space is left, this function reduces the size and |
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* tries to allocate again. The size actually allocated is stored in |
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* res_size argument. |
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* |
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* Return: Zero if the buffer with the given size is allocated successfully, |
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* otherwise a negative value on error. |
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*/ |
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int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size, |
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struct snd_dma_buffer *dmab) |
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{ |
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int err; |
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|
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while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) { |
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if (err != -ENOMEM) |
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return err; |
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if (size <= PAGE_SIZE) |
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return -ENOMEM; |
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size >>= 1; |
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size = PAGE_SIZE << get_order(size); |
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} |
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if (! dmab->area) |
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return -ENOMEM; |
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return 0; |
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} |
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EXPORT_SYMBOL(snd_dma_alloc_pages_fallback); |
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|
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/** |
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* snd_dma_free_pages - release the allocated buffer |
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* @dmab: the buffer allocation record to release |
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* |
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* Releases the allocated buffer via snd_dma_alloc_pages(). |
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*/ |
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void snd_dma_free_pages(struct snd_dma_buffer *dmab) |
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{ |
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab); |
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|
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if (ops && ops->free) |
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ops->free(dmab); |
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} |
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EXPORT_SYMBOL(snd_dma_free_pages); |
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|
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/* called by devres */ |
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static void __snd_release_pages(struct device *dev, void *res) |
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{ |
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snd_dma_free_pages(res); |
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} |
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|
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/** |
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* snd_devm_alloc_dir_pages - allocate the buffer and manage with devres |
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* @dev: the device pointer |
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* @type: the DMA buffer type |
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* @dir: DMA direction |
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* @size: the buffer size to allocate |
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* |
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* Allocate buffer pages depending on the given type and manage using devres. |
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* The pages will be released automatically at the device removal. |
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* |
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* Unlike snd_dma_alloc_pages(), this function requires the real device pointer, |
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* hence it can't work with SNDRV_DMA_TYPE_CONTINUOUS or |
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* SNDRV_DMA_TYPE_VMALLOC type. |
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* |
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* Return: the snd_dma_buffer object at success, or NULL if failed |
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*/ |
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struct snd_dma_buffer * |
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snd_devm_alloc_dir_pages(struct device *dev, int type, |
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enum dma_data_direction dir, size_t size) |
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{ |
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struct snd_dma_buffer *dmab; |
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int err; |
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|
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if (WARN_ON(type == SNDRV_DMA_TYPE_CONTINUOUS || |
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type == SNDRV_DMA_TYPE_VMALLOC)) |
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return NULL; |
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dmab = devres_alloc(__snd_release_pages, sizeof(*dmab), GFP_KERNEL); |
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if (!dmab) |
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return NULL; |
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err = snd_dma_alloc_dir_pages(type, dev, dir, size, dmab); |
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if (err < 0) { |
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devres_free(dmab); |
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return NULL; |
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} |
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|
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devres_add(dev, dmab); |
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return dmab; |
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} |
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EXPORT_SYMBOL_GPL(snd_devm_alloc_dir_pages); |
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|
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/** |
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* snd_dma_buffer_mmap - perform mmap of the given DMA buffer |
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* @dmab: buffer allocation information |
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* @area: VM area information |
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* |
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* Return: zero if successful, or a negative error code |
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*/ |
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int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab, |
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struct vm_area_struct *area) |
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{ |
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const struct snd_malloc_ops *ops; |
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|
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if (!dmab) |
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return -ENOENT; |
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ops = snd_dma_get_ops(dmab); |
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if (ops && ops->mmap) |
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return ops->mmap(dmab, area); |
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else |
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return -ENOENT; |
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} |
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EXPORT_SYMBOL(snd_dma_buffer_mmap); |
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|
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#ifdef CONFIG_HAS_DMA |
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/** |
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* snd_dma_buffer_sync - sync DMA buffer between CPU and device |
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* @dmab: buffer allocation information |
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* @mode: sync mode |
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*/ |
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void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, |
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enum snd_dma_sync_mode mode) |
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{ |
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const struct snd_malloc_ops *ops; |
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|
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if (!dmab || !dmab->dev.need_sync) |
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return; |
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ops = snd_dma_get_ops(dmab); |
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if (ops && ops->sync) |
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ops->sync(dmab, mode); |
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} |
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EXPORT_SYMBOL_GPL(snd_dma_buffer_sync); |
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#endif /* CONFIG_HAS_DMA */ |
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|
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/** |
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* snd_sgbuf_get_addr - return the physical address at the corresponding offset |
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* @dmab: buffer allocation information |
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* @offset: offset in the ring buffer |
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* |
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* Return: the physical address |
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*/ |
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dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset) |
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{ |
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab); |
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if (ops && ops->get_addr) |
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return ops->get_addr(dmab, offset); |
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else |
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return dmab->addr + offset; |
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} |
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EXPORT_SYMBOL(snd_sgbuf_get_addr); |
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|
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/** |
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* snd_sgbuf_get_page - return the physical page at the corresponding offset |
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* @dmab: buffer allocation information |
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* @offset: offset in the ring buffer |
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* |
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* Return: the page pointer |
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*/ |
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struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset) |
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{ |
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab); |
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if (ops && ops->get_page) |
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return ops->get_page(dmab, offset); |
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else |
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return virt_to_page(dmab->area + offset); |
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} |
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EXPORT_SYMBOL(snd_sgbuf_get_page); |
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|
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/** |
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* snd_sgbuf_get_chunk_size - compute the max chunk size with continuous pages |
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* on sg-buffer |
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* @dmab: buffer allocation information |
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* @ofs: offset in the ring buffer |
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* @size: the requested size |
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* |
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* Return: the chunk size |
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*/ |
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unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, |
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unsigned int ofs, unsigned int size) |
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{ |
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab); |
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if (ops && ops->get_chunk_size) |
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return ops->get_chunk_size(dmab, ofs, size); |
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else |
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return size; |
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} |
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EXPORT_SYMBOL(snd_sgbuf_get_chunk_size); |
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/* |
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* Continuous pages allocator |
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*/ |
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static void *do_alloc_pages(struct device *dev, size_t size, dma_addr_t *addr, |
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bool wc) |
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{ |
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void *p; |
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gfp_t gfp = GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN; |
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|
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again: |
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p = alloc_pages_exact(size, gfp); |
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if (!p) |
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return NULL; |
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*addr = page_to_phys(virt_to_page(p)); |
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if (!dev) |
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return p; |
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if ((*addr + size - 1) & ~dev->coherent_dma_mask) { |
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if (IS_ENABLED(CONFIG_ZONE_DMA32) && !(gfp & GFP_DMA32)) { |
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gfp |= GFP_DMA32; |
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goto again; |
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} |
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if (IS_ENABLED(CONFIG_ZONE_DMA) && !(gfp & GFP_DMA)) { |
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gfp = (gfp & ~GFP_DMA32) | GFP_DMA; |
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goto again; |
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} |
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} |
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#ifdef CONFIG_X86 |
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if (wc) |
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set_memory_wc((unsigned long)(p), size >> PAGE_SHIFT); |
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#endif |
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return p; |
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} |
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static void do_free_pages(void *p, size_t size, bool wc) |
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{ |
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#ifdef CONFIG_X86 |
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if (wc) |
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set_memory_wb((unsigned long)(p), size >> PAGE_SHIFT); |
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#endif |
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free_pages_exact(p, size); |
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} |
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static void *snd_dma_continuous_alloc(struct snd_dma_buffer *dmab, size_t size) |
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{ |
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return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, false); |
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} |
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static void snd_dma_continuous_free(struct snd_dma_buffer *dmab) |
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{ |
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do_free_pages(dmab->area, dmab->bytes, false); |
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} |
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static int snd_dma_continuous_mmap(struct snd_dma_buffer *dmab, |
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struct vm_area_struct *area) |
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{ |
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return remap_pfn_range(area, area->vm_start, |
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dmab->addr >> PAGE_SHIFT, |
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area->vm_end - area->vm_start, |
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area->vm_page_prot); |
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} |
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static const struct snd_malloc_ops snd_dma_continuous_ops = { |
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.alloc = snd_dma_continuous_alloc, |
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.free = snd_dma_continuous_free, |
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.mmap = snd_dma_continuous_mmap, |
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}; |
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/* |
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* VMALLOC allocator |
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*/ |
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static void *snd_dma_vmalloc_alloc(struct snd_dma_buffer *dmab, size_t size) |
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{ |
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return vmalloc(size); |
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} |
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static void snd_dma_vmalloc_free(struct snd_dma_buffer *dmab) |
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{ |
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vfree(dmab->area); |
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} |
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static int snd_dma_vmalloc_mmap(struct snd_dma_buffer *dmab, |
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struct vm_area_struct *area) |
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{ |
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return remap_vmalloc_range(area, dmab->area, 0); |
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} |
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#define get_vmalloc_page_addr(dmab, offset) \ |
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page_to_phys(vmalloc_to_page((dmab)->area + (offset))) |
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|
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static dma_addr_t snd_dma_vmalloc_get_addr(struct snd_dma_buffer *dmab, |
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size_t offset) |
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{ |
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return get_vmalloc_page_addr(dmab, offset) + offset % PAGE_SIZE; |
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} |
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static struct page *snd_dma_vmalloc_get_page(struct snd_dma_buffer *dmab, |
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size_t offset) |
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{ |
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return vmalloc_to_page(dmab->area + offset); |
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} |
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|
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static unsigned int |
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snd_dma_vmalloc_get_chunk_size(struct snd_dma_buffer *dmab, |
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unsigned int ofs, unsigned int size) |
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{ |
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unsigned int start, end; |
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unsigned long addr; |
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start = ALIGN_DOWN(ofs, PAGE_SIZE); |
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end = ofs + size - 1; /* the last byte address */ |
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/* check page continuity */ |
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addr = get_vmalloc_page_addr(dmab, start); |
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for (;;) { |
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start += PAGE_SIZE; |
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if (start > end) |
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break; |
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addr += PAGE_SIZE; |
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if (get_vmalloc_page_addr(dmab, start) != addr) |
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return start - ofs; |
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} |
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/* ok, all on continuous pages */ |
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return size; |
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} |
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static const struct snd_malloc_ops snd_dma_vmalloc_ops = { |
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.alloc = snd_dma_vmalloc_alloc, |
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.free = snd_dma_vmalloc_free, |
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.mmap = snd_dma_vmalloc_mmap, |
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.get_addr = snd_dma_vmalloc_get_addr, |
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.get_page = snd_dma_vmalloc_get_page, |
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.get_chunk_size = snd_dma_vmalloc_get_chunk_size, |
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}; |
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#ifdef CONFIG_HAS_DMA |
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/* |
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* IRAM allocator |
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*/ |
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#ifdef CONFIG_GENERIC_ALLOCATOR |
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static void *snd_dma_iram_alloc(struct snd_dma_buffer *dmab, size_t size) |
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{ |
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struct device *dev = dmab->dev.dev; |
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struct gen_pool *pool; |
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void *p; |
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|
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if (dev->of_node) { |
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pool = of_gen_pool_get(dev->of_node, "iram", 0); |
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/* Assign the pool into private_data field */ |
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dmab->private_data = pool; |
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|
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p = gen_pool_dma_alloc_align(pool, size, &dmab->addr, PAGE_SIZE); |
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if (p) |
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return p; |
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} |
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|
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/* Internal memory might have limited size and no enough space, |
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* so if we fail to malloc, try to fetch memory traditionally. |
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*/ |
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dmab->dev.type = SNDRV_DMA_TYPE_DEV; |
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return __snd_dma_alloc_pages(dmab, size); |
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} |
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|
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static void snd_dma_iram_free(struct snd_dma_buffer *dmab) |
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{ |
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struct gen_pool *pool = dmab->private_data; |
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|
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if (pool && dmab->area) |
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gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes); |
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} |
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static int snd_dma_iram_mmap(struct snd_dma_buffer *dmab, |
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struct vm_area_struct *area) |
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{ |
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area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); |
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return remap_pfn_range(area, area->vm_start, |
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dmab->addr >> PAGE_SHIFT, |
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area->vm_end - area->vm_start, |
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area->vm_page_prot); |
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} |
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|
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static const struct snd_malloc_ops snd_dma_iram_ops = { |
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.alloc = snd_dma_iram_alloc, |
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.free = snd_dma_iram_free, |
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.mmap = snd_dma_iram_mmap, |
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}; |
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#endif /* CONFIG_GENERIC_ALLOCATOR */ |
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|
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/* |
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* Coherent device pages allocator |
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*/ |
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static void *snd_dma_dev_alloc(struct snd_dma_buffer *dmab, size_t size) |
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{ |
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return dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP); |
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} |
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|
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static void snd_dma_dev_free(struct snd_dma_buffer *dmab) |
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{ |
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dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); |
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} |
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|
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static int snd_dma_dev_mmap(struct snd_dma_buffer *dmab, |
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struct vm_area_struct *area) |
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{ |
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return dma_mmap_coherent(dmab->dev.dev, area, |
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dmab->area, dmab->addr, dmab->bytes); |
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} |
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|
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static const struct snd_malloc_ops snd_dma_dev_ops = { |
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.alloc = snd_dma_dev_alloc, |
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.free = snd_dma_dev_free, |
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.mmap = snd_dma_dev_mmap, |
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}; |
|
|
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/* |
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* Write-combined pages |
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*/ |
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/* x86-specific allocations */ |
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#ifdef CONFIG_SND_DMA_SGBUF |
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static void *snd_dma_wc_alloc(struct snd_dma_buffer *dmab, size_t size) |
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{ |
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return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, true); |
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} |
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|
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static void snd_dma_wc_free(struct snd_dma_buffer *dmab) |
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{ |
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do_free_pages(dmab->area, dmab->bytes, true); |
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} |
|
|
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static int snd_dma_wc_mmap(struct snd_dma_buffer *dmab, |
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struct vm_area_struct *area) |
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{ |
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area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); |
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return snd_dma_continuous_mmap(dmab, area); |
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} |
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#else |
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static void *snd_dma_wc_alloc(struct snd_dma_buffer *dmab, size_t size) |
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{ |
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return dma_alloc_wc(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP); |
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} |
|
|
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static void snd_dma_wc_free(struct snd_dma_buffer *dmab) |
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{ |
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dma_free_wc(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); |
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} |
|
|
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static int snd_dma_wc_mmap(struct snd_dma_buffer *dmab, |
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struct vm_area_struct *area) |
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{ |
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return dma_mmap_wc(dmab->dev.dev, area, |
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dmab->area, dmab->addr, dmab->bytes); |
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} |
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#endif /* CONFIG_SND_DMA_SGBUF */ |
|
|
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static const struct snd_malloc_ops snd_dma_wc_ops = { |
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.alloc = snd_dma_wc_alloc, |
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.free = snd_dma_wc_free, |
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.mmap = snd_dma_wc_mmap, |
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}; |
|
|
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/* |
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* Non-contiguous pages allocator |
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*/ |
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static void *snd_dma_noncontig_alloc(struct snd_dma_buffer *dmab, size_t size) |
|
{ |
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struct sg_table *sgt; |
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void *p; |
|
|
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sgt = dma_alloc_noncontiguous(dmab->dev.dev, size, dmab->dev.dir, |
|
DEFAULT_GFP, 0); |
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#ifdef CONFIG_SND_DMA_SGBUF |
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if (!sgt && !get_dma_ops(dmab->dev.dev)) { |
|
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG) |
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dmab->dev.type = SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK; |
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else |
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dmab->dev.type = SNDRV_DMA_TYPE_DEV_SG_FALLBACK; |
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return snd_dma_sg_fallback_alloc(dmab, size); |
|
} |
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#endif |
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if (!sgt) |
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return NULL; |
|
|
|
dmab->dev.need_sync = dma_need_sync(dmab->dev.dev, |
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sg_dma_address(sgt->sgl)); |
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p = dma_vmap_noncontiguous(dmab->dev.dev, size, sgt); |
|
if (p) { |
|
dmab->private_data = sgt; |
|
/* store the first page address for convenience */ |
|
dmab->addr = snd_sgbuf_get_addr(dmab, 0); |
|
} else { |
|
dma_free_noncontiguous(dmab->dev.dev, size, sgt, dmab->dev.dir); |
|
} |
|
return p; |
|
} |
|
|
|
static void snd_dma_noncontig_free(struct snd_dma_buffer *dmab) |
|
{ |
|
dma_vunmap_noncontiguous(dmab->dev.dev, dmab->area); |
|
dma_free_noncontiguous(dmab->dev.dev, dmab->bytes, dmab->private_data, |
|
dmab->dev.dir); |
|
} |
|
|
|
static int snd_dma_noncontig_mmap(struct snd_dma_buffer *dmab, |
|
struct vm_area_struct *area) |
|
{ |
|
return dma_mmap_noncontiguous(dmab->dev.dev, area, |
|
dmab->bytes, dmab->private_data); |
|
} |
|
|
|
static void snd_dma_noncontig_sync(struct snd_dma_buffer *dmab, |
|
enum snd_dma_sync_mode mode) |
|
{ |
|
if (mode == SNDRV_DMA_SYNC_CPU) { |
|
if (dmab->dev.dir == DMA_TO_DEVICE) |
|
return; |
|
invalidate_kernel_vmap_range(dmab->area, dmab->bytes); |
|
dma_sync_sgtable_for_cpu(dmab->dev.dev, dmab->private_data, |
|
dmab->dev.dir); |
|
} else { |
|
if (dmab->dev.dir == DMA_FROM_DEVICE) |
|
return; |
|
flush_kernel_vmap_range(dmab->area, dmab->bytes); |
|
dma_sync_sgtable_for_device(dmab->dev.dev, dmab->private_data, |
|
dmab->dev.dir); |
|
} |
|
} |
|
|
|
static inline void snd_dma_noncontig_iter_set(struct snd_dma_buffer *dmab, |
|
struct sg_page_iter *piter, |
|
size_t offset) |
|
{ |
|
struct sg_table *sgt = dmab->private_data; |
|
|
|
__sg_page_iter_start(piter, sgt->sgl, sgt->orig_nents, |
|
offset >> PAGE_SHIFT); |
|
} |
|
|
|
static dma_addr_t snd_dma_noncontig_get_addr(struct snd_dma_buffer *dmab, |
|
size_t offset) |
|
{ |
|
struct sg_dma_page_iter iter; |
|
|
|
snd_dma_noncontig_iter_set(dmab, &iter.base, offset); |
|
__sg_page_iter_dma_next(&iter); |
|
return sg_page_iter_dma_address(&iter) + offset % PAGE_SIZE; |
|
} |
|
|
|
static struct page *snd_dma_noncontig_get_page(struct snd_dma_buffer *dmab, |
|
size_t offset) |
|
{ |
|
struct sg_page_iter iter; |
|
|
|
snd_dma_noncontig_iter_set(dmab, &iter, offset); |
|
__sg_page_iter_next(&iter); |
|
return sg_page_iter_page(&iter); |
|
} |
|
|
|
static unsigned int |
|
snd_dma_noncontig_get_chunk_size(struct snd_dma_buffer *dmab, |
|
unsigned int ofs, unsigned int size) |
|
{ |
|
struct sg_dma_page_iter iter; |
|
unsigned int start, end; |
|
unsigned long addr; |
|
|
|
start = ALIGN_DOWN(ofs, PAGE_SIZE); |
|
end = ofs + size - 1; /* the last byte address */ |
|
snd_dma_noncontig_iter_set(dmab, &iter.base, start); |
|
if (!__sg_page_iter_dma_next(&iter)) |
|
return 0; |
|
/* check page continuity */ |
|
addr = sg_page_iter_dma_address(&iter); |
|
for (;;) { |
|
start += PAGE_SIZE; |
|
if (start > end) |
|
break; |
|
addr += PAGE_SIZE; |
|
if (!__sg_page_iter_dma_next(&iter) || |
|
sg_page_iter_dma_address(&iter) != addr) |
|
return start - ofs; |
|
} |
|
/* ok, all on continuous pages */ |
|
return size; |
|
} |
|
|
|
static const struct snd_malloc_ops snd_dma_noncontig_ops = { |
|
.alloc = snd_dma_noncontig_alloc, |
|
.free = snd_dma_noncontig_free, |
|
.mmap = snd_dma_noncontig_mmap, |
|
.sync = snd_dma_noncontig_sync, |
|
.get_addr = snd_dma_noncontig_get_addr, |
|
.get_page = snd_dma_noncontig_get_page, |
|
.get_chunk_size = snd_dma_noncontig_get_chunk_size, |
|
}; |
|
|
|
/* x86-specific SG-buffer with WC pages */ |
|
#ifdef CONFIG_SND_DMA_SGBUF |
|
#define sg_wc_address(it) ((unsigned long)page_address(sg_page_iter_page(it))) |
|
|
|
static void *snd_dma_sg_wc_alloc(struct snd_dma_buffer *dmab, size_t size) |
|
{ |
|
void *p = snd_dma_noncontig_alloc(dmab, size); |
|
struct sg_table *sgt = dmab->private_data; |
|
struct sg_page_iter iter; |
|
|
|
if (!p) |
|
return NULL; |
|
if (dmab->dev.type != SNDRV_DMA_TYPE_DEV_WC_SG) |
|
return p; |
|
for_each_sgtable_page(sgt, &iter, 0) |
|
set_memory_wc(sg_wc_address(&iter), 1); |
|
return p; |
|
} |
|
|
|
static void snd_dma_sg_wc_free(struct snd_dma_buffer *dmab) |
|
{ |
|
struct sg_table *sgt = dmab->private_data; |
|
struct sg_page_iter iter; |
|
|
|
for_each_sgtable_page(sgt, &iter, 0) |
|
set_memory_wb(sg_wc_address(&iter), 1); |
|
snd_dma_noncontig_free(dmab); |
|
} |
|
|
|
static int snd_dma_sg_wc_mmap(struct snd_dma_buffer *dmab, |
|
struct vm_area_struct *area) |
|
{ |
|
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); |
|
return dma_mmap_noncontiguous(dmab->dev.dev, area, |
|
dmab->bytes, dmab->private_data); |
|
} |
|
|
|
static const struct snd_malloc_ops snd_dma_sg_wc_ops = { |
|
.alloc = snd_dma_sg_wc_alloc, |
|
.free = snd_dma_sg_wc_free, |
|
.mmap = snd_dma_sg_wc_mmap, |
|
.sync = snd_dma_noncontig_sync, |
|
.get_addr = snd_dma_noncontig_get_addr, |
|
.get_page = snd_dma_noncontig_get_page, |
|
.get_chunk_size = snd_dma_noncontig_get_chunk_size, |
|
}; |
|
|
|
/* Fallback SG-buffer allocations for x86 */ |
|
struct snd_dma_sg_fallback { |
|
size_t count; |
|
struct page **pages; |
|
dma_addr_t *addrs; |
|
}; |
|
|
|
static void __snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab, |
|
struct snd_dma_sg_fallback *sgbuf) |
|
{ |
|
bool wc = dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK; |
|
size_t i; |
|
|
|
for (i = 0; i < sgbuf->count && sgbuf->pages[i]; i++) |
|
do_free_pages(page_address(sgbuf->pages[i]), PAGE_SIZE, wc); |
|
kvfree(sgbuf->pages); |
|
kvfree(sgbuf->addrs); |
|
kfree(sgbuf); |
|
} |
|
|
|
static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size) |
|
{ |
|
struct snd_dma_sg_fallback *sgbuf; |
|
struct page **pages; |
|
size_t i, count; |
|
void *p; |
|
bool wc = dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK; |
|
|
|
sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL); |
|
if (!sgbuf) |
|
return NULL; |
|
count = PAGE_ALIGN(size) >> PAGE_SHIFT; |
|
pages = kvcalloc(count, sizeof(*pages), GFP_KERNEL); |
|
if (!pages) |
|
goto error; |
|
sgbuf->pages = pages; |
|
sgbuf->addrs = kvcalloc(count, sizeof(*sgbuf->addrs), GFP_KERNEL); |
|
if (!sgbuf->addrs) |
|
goto error; |
|
|
|
for (i = 0; i < count; sgbuf->count++, i++) { |
|
p = do_alloc_pages(dmab->dev.dev, PAGE_SIZE, &sgbuf->addrs[i], wc); |
|
if (!p) |
|
goto error; |
|
sgbuf->pages[i] = virt_to_page(p); |
|
} |
|
|
|
p = vmap(pages, count, VM_MAP, PAGE_KERNEL); |
|
if (!p) |
|
goto error; |
|
dmab->private_data = sgbuf; |
|
/* store the first page address for convenience */ |
|
dmab->addr = snd_sgbuf_get_addr(dmab, 0); |
|
return p; |
|
|
|
error: |
|
__snd_dma_sg_fallback_free(dmab, sgbuf); |
|
return NULL; |
|
} |
|
|
|
static void snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab) |
|
{ |
|
vunmap(dmab->area); |
|
__snd_dma_sg_fallback_free(dmab, dmab->private_data); |
|
} |
|
|
|
static int snd_dma_sg_fallback_mmap(struct snd_dma_buffer *dmab, |
|
struct vm_area_struct *area) |
|
{ |
|
struct snd_dma_sg_fallback *sgbuf = dmab->private_data; |
|
|
|
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK) |
|
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); |
|
return vm_map_pages(area, sgbuf->pages, sgbuf->count); |
|
} |
|
|
|
static const struct snd_malloc_ops snd_dma_sg_fallback_ops = { |
|
.alloc = snd_dma_sg_fallback_alloc, |
|
.free = snd_dma_sg_fallback_free, |
|
.mmap = snd_dma_sg_fallback_mmap, |
|
/* reuse vmalloc helpers */ |
|
.get_addr = snd_dma_vmalloc_get_addr, |
|
.get_page = snd_dma_vmalloc_get_page, |
|
.get_chunk_size = snd_dma_vmalloc_get_chunk_size, |
|
}; |
|
#endif /* CONFIG_SND_DMA_SGBUF */ |
|
|
|
/* |
|
* Non-coherent pages allocator |
|
*/ |
|
static void *snd_dma_noncoherent_alloc(struct snd_dma_buffer *dmab, size_t size) |
|
{ |
|
void *p; |
|
|
|
p = dma_alloc_noncoherent(dmab->dev.dev, size, &dmab->addr, |
|
dmab->dev.dir, DEFAULT_GFP); |
|
if (p) |
|
dmab->dev.need_sync = dma_need_sync(dmab->dev.dev, dmab->addr); |
|
return p; |
|
} |
|
|
|
static void snd_dma_noncoherent_free(struct snd_dma_buffer *dmab) |
|
{ |
|
dma_free_noncoherent(dmab->dev.dev, dmab->bytes, dmab->area, |
|
dmab->addr, dmab->dev.dir); |
|
} |
|
|
|
static int snd_dma_noncoherent_mmap(struct snd_dma_buffer *dmab, |
|
struct vm_area_struct *area) |
|
{ |
|
area->vm_page_prot = vm_get_page_prot(area->vm_flags); |
|
return dma_mmap_pages(dmab->dev.dev, area, |
|
area->vm_end - area->vm_start, |
|
virt_to_page(dmab->area)); |
|
} |
|
|
|
static void snd_dma_noncoherent_sync(struct snd_dma_buffer *dmab, |
|
enum snd_dma_sync_mode mode) |
|
{ |
|
if (mode == SNDRV_DMA_SYNC_CPU) { |
|
if (dmab->dev.dir != DMA_TO_DEVICE) |
|
dma_sync_single_for_cpu(dmab->dev.dev, dmab->addr, |
|
dmab->bytes, dmab->dev.dir); |
|
} else { |
|
if (dmab->dev.dir != DMA_FROM_DEVICE) |
|
dma_sync_single_for_device(dmab->dev.dev, dmab->addr, |
|
dmab->bytes, dmab->dev.dir); |
|
} |
|
} |
|
|
|
static const struct snd_malloc_ops snd_dma_noncoherent_ops = { |
|
.alloc = snd_dma_noncoherent_alloc, |
|
.free = snd_dma_noncoherent_free, |
|
.mmap = snd_dma_noncoherent_mmap, |
|
.sync = snd_dma_noncoherent_sync, |
|
}; |
|
|
|
#endif /* CONFIG_HAS_DMA */ |
|
|
|
/* |
|
* Entry points |
|
*/ |
|
static const struct snd_malloc_ops *snd_dma_ops[] = { |
|
[SNDRV_DMA_TYPE_CONTINUOUS] = &snd_dma_continuous_ops, |
|
[SNDRV_DMA_TYPE_VMALLOC] = &snd_dma_vmalloc_ops, |
|
#ifdef CONFIG_HAS_DMA |
|
[SNDRV_DMA_TYPE_DEV] = &snd_dma_dev_ops, |
|
[SNDRV_DMA_TYPE_DEV_WC] = &snd_dma_wc_ops, |
|
[SNDRV_DMA_TYPE_NONCONTIG] = &snd_dma_noncontig_ops, |
|
[SNDRV_DMA_TYPE_NONCOHERENT] = &snd_dma_noncoherent_ops, |
|
#ifdef CONFIG_SND_DMA_SGBUF |
|
[SNDRV_DMA_TYPE_DEV_WC_SG] = &snd_dma_sg_wc_ops, |
|
#endif |
|
#ifdef CONFIG_GENERIC_ALLOCATOR |
|
[SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops, |
|
#endif /* CONFIG_GENERIC_ALLOCATOR */ |
|
#ifdef CONFIG_SND_DMA_SGBUF |
|
[SNDRV_DMA_TYPE_DEV_SG_FALLBACK] = &snd_dma_sg_fallback_ops, |
|
[SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK] = &snd_dma_sg_fallback_ops, |
|
#endif |
|
#endif /* CONFIG_HAS_DMA */ |
|
}; |
|
|
|
static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab) |
|
{ |
|
if (WARN_ON_ONCE(!dmab)) |
|
return NULL; |
|
if (WARN_ON_ONCE(dmab->dev.type <= SNDRV_DMA_TYPE_UNKNOWN || |
|
dmab->dev.type >= ARRAY_SIZE(snd_dma_ops))) |
|
return NULL; |
|
return snd_dma_ops[dmab->dev.type]; |
|
}
|
|
|