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a202bd1ad8
This patch moves the mmap handling code into the common memalloc handler. It allows us to reduce the memory-type specific code in PCM code gracefully. Link: https://lore.kernel.org/r/20210609162551.7842-5-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Takashi Iwai <tiwai@suse.de>
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*
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* Generic memory allocators
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*/
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#ifndef __SOUND_MEMALLOC_H
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#define __SOUND_MEMALLOC_H
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struct device;
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struct page;
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struct vm_area_struct;
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/*
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* buffer device info
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*/
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struct snd_dma_device {
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int type; /* SNDRV_DMA_TYPE_XXX */
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struct device *dev; /* generic device */
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};
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#define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
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/*
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* buffer types
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*/
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#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
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#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
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#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
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#define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */
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#ifdef CONFIG_SND_DMA_SGBUF
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#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
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#define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */
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#else
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#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
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#define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC
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#endif
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#ifdef CONFIG_GENERIC_ALLOCATOR
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#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
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#else
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#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
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#endif
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#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
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/*
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* info for buffer allocation
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*/
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struct snd_dma_buffer {
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struct snd_dma_device dev; /* device type */
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unsigned char *area; /* virtual pointer */
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dma_addr_t addr; /* physical address */
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size_t bytes; /* buffer size in bytes */
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void *private_data; /* private for allocator; don't touch */
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};
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/*
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* return the pages matching with the given byte size
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*/
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static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
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{
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return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
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}
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/* allocate/release a buffer */
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int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
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struct snd_dma_buffer *dmab);
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int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
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struct snd_dma_buffer *dmab);
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void snd_dma_free_pages(struct snd_dma_buffer *dmab);
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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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dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);
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struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);
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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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#endif /* __SOUND_MEMALLOC_H */
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