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498 lines
13 KiB
498 lines
13 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/genalloc.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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static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab); |
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|
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/* a cast to gfp flag from the dev pointer; for CONTINUOUS and VMALLOC types */ |
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static inline gfp_t snd_mem_get_gfp_flags(const struct snd_dma_buffer *dmab, |
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gfp_t default_gfp) |
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{ |
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if (!dmab->dev.dev) |
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return default_gfp; |
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else |
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return (__force gfp_t)(unsigned long)dmab->dev.dev; |
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} |
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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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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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* snd_dma_alloc_pages - allocate the buffer area according to the given type |
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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. |
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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(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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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->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_pages); |
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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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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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* 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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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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/* 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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* snd_devm_alloc_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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* @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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* The function returns 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_pages(struct device *dev, int type, 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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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_pages(type, dev, 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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devres_add(dev, dmab); |
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return dmab; |
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} |
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EXPORT_SYMBOL_GPL(snd_devm_alloc_pages); |
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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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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 = 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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* 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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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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* 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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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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* 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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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 *snd_dma_continuous_alloc(struct snd_dma_buffer *dmab, size_t size) |
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{ |
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gfp_t gfp = snd_mem_get_gfp_flags(dmab, GFP_KERNEL); |
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void *p = alloc_pages_exact(size, gfp); |
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if (p) |
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dmab->addr = page_to_phys(virt_to_page(p)); |
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return p; |
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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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free_pages_exact(dmab->area, dmab->bytes); |
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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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gfp_t gfp = snd_mem_get_gfp_flags(dmab, GFP_KERNEL | __GFP_HIGHMEM); |
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return __vmalloc(size, gfp); |
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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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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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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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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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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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/* 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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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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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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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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#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_NORETRY | /* 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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* 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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void *p; |
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p = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP); |
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#ifdef CONFIG_X86 |
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if (p && dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC) |
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set_memory_wc((unsigned long)p, PAGE_ALIGN(size) >> PAGE_SHIFT); |
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#endif |
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return p; |
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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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#ifdef CONFIG_X86 |
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if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC) |
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set_memory_wb((unsigned long)dmab->area, |
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PAGE_ALIGN(dmab->bytes) >> PAGE_SHIFT); |
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#endif |
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dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); |
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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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#ifdef CONFIG_X86 |
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if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC) |
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area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); |
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#endif |
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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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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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#ifdef CONFIG_X86 |
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/* On x86, share the same ops as the standard dev ops */ |
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#define snd_dma_wc_ops snd_dma_dev_ops |
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#else /* CONFIG_X86 */ |
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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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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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#endif /* CONFIG_X86 */ |
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#endif /* CONFIG_HAS_DMA */ |
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/* |
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* Entry points |
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*/ |
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static const struct snd_malloc_ops *dma_ops[] = { |
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[SNDRV_DMA_TYPE_CONTINUOUS] = &snd_dma_continuous_ops, |
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[SNDRV_DMA_TYPE_VMALLOC] = &snd_dma_vmalloc_ops, |
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#ifdef CONFIG_HAS_DMA |
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[SNDRV_DMA_TYPE_DEV] = &snd_dma_dev_ops, |
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[SNDRV_DMA_TYPE_DEV_WC] = &snd_dma_wc_ops, |
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#ifdef CONFIG_GENERIC_ALLOCATOR |
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[SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops, |
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#endif /* CONFIG_GENERIC_ALLOCATOR */ |
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#endif /* CONFIG_HAS_DMA */ |
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#ifdef CONFIG_SND_DMA_SGBUF |
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[SNDRV_DMA_TYPE_DEV_SG] = &snd_dma_sg_ops, |
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[SNDRV_DMA_TYPE_DEV_WC_SG] = &snd_dma_sg_ops, |
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#endif |
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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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{ |
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if (WARN_ON_ONCE(dmab->dev.type <= SNDRV_DMA_TYPE_UNKNOWN || |
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dmab->dev.type >= ARRAY_SIZE(dma_ops))) |
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return NULL; |
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return dma_ops[dmab->dev.type]; |
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}
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