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128 lines
3.9 KiB
128 lines
3.9 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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#ifndef __SOUND_MEMALLOC_H |
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#define __SOUND_MEMALLOC_H |
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#include <linux/dma-direction.h> |
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#include <asm/page.h> |
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struct device; |
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struct vm_area_struct; |
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struct sg_table; |
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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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enum dma_data_direction dir; /* DMA direction */ |
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bool need_sync; /* explicit sync needed? */ |
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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_WC 5 /* continuous write-combined */ |
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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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#define SNDRV_DMA_TYPE_NONCONTIG 8 /* non-coherent SG buffer */ |
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#define SNDRV_DMA_TYPE_NONCOHERENT 9 /* non-coherent buffer */ |
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#ifdef CONFIG_SND_DMA_SGBUF |
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#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_NONCONTIG |
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#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */ |
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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_WC_SG SNDRV_DMA_TYPE_DEV_WC |
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#endif |
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/* fallback types, don't use those directly */ |
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#ifdef CONFIG_SND_DMA_SGBUF |
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#define SNDRV_DMA_TYPE_DEV_SG_FALLBACK 10 |
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#define SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK 11 |
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#endif |
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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_dir_pages(int type, struct device *dev, |
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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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static inline int snd_dma_alloc_pages(int type, struct device *dev, |
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size_t size, struct snd_dma_buffer *dmab) |
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{ |
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return snd_dma_alloc_dir_pages(type, dev, DMA_BIDIRECTIONAL, size, dmab); |
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} |
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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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enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE }; |
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#ifdef CONFIG_HAS_DMA |
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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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#else |
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static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab, |
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enum snd_dma_sync_mode mode) {} |
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#endif |
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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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/* device-managed memory allocator */ |
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struct snd_dma_buffer *snd_devm_alloc_dir_pages(struct device *dev, int type, |
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enum dma_data_direction dir, |
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size_t size); |
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static inline 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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return snd_devm_alloc_dir_pages(dev, type, DMA_BIDIRECTIONAL, size); |
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} |
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static inline struct sg_table * |
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snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab) |
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{ |
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return dmab->private_data; |
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} |
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#endif /* __SOUND_MEMALLOC_H */ |
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