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Diffstat (limited to '')
| -rw-r--r-- | include/sound/memalloc.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h new file mode 100644 index 000000000..5daa93768 --- /dev/null +++ b/include/sound/memalloc.h @@ -0,0 +1,147 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + * Takashi Iwai <tiwai@suse.de> + * + * Generic memory allocators + */ + +#ifndef __SOUND_MEMALLOC_H +#define __SOUND_MEMALLOC_H + +#include <asm/page.h> + +struct device; + +/* + * buffer device info + */ +struct snd_dma_device { + int type; /* SNDRV_DMA_TYPE_XXX */ + struct device *dev; /* generic device */ +}; + +#define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x)) + + +/* + * buffer types + */ +#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */ +#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */ +#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */ +#define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */ +#ifdef CONFIG_SND_DMA_SGBUF +#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ +#define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */ +#else +#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ +#define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC +#endif +#ifdef CONFIG_GENERIC_ALLOCATOR +#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */ +#else +#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV +#endif +#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */ + +/* + * info for buffer allocation + */ +struct snd_dma_buffer { + struct snd_dma_device dev; /* device type */ + unsigned char *area; /* virtual pointer */ + dma_addr_t addr; /* physical address */ + size_t bytes; /* buffer size in bytes */ + void *private_data; /* private for allocator; don't touch */ +}; + +/* + * return the pages matching with the given byte size + */ +static inline unsigned int snd_sgbuf_aligned_pages(size_t size) +{ + return (size + PAGE_SIZE - 1) >> PAGE_SHIFT; +} + +#ifdef CONFIG_SND_DMA_SGBUF +/* + * Scatter-Gather generic device pages + */ +void *snd_malloc_sgbuf_pages(struct device *device, + size_t size, struct snd_dma_buffer *dmab, + size_t *res_size); +int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); + +struct snd_sg_page { + void *buf; + dma_addr_t addr; +}; + +struct snd_sg_buf { + int size; /* allocated byte size */ + int pages; /* allocated pages */ + int tblsize; /* allocated table size */ + struct snd_sg_page *table; /* address table */ + struct page **page_table; /* page table (for vmap/vunmap) */ + struct device *dev; +}; + +/* + * return the physical address at the corresponding offset + */ +static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, + size_t offset) +{ + struct snd_sg_buf *sgbuf = dmab->private_data; + dma_addr_t addr; + + if (!sgbuf) + return dmab->addr + offset; + addr = sgbuf->table[offset >> PAGE_SHIFT].addr; + addr &= ~((dma_addr_t)PAGE_SIZE - 1); + return addr + offset % PAGE_SIZE; +} + +/* + * return the virtual address at the corresponding offset + */ +static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, + size_t offset) +{ + struct snd_sg_buf *sgbuf = dmab->private_data; + + if (!sgbuf) + return dmab->area + offset; + return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE; +} + +unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, + unsigned int ofs, unsigned int size); +#else +/* non-SG versions */ +static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, + size_t offset) +{ + return dmab->addr + offset; +} + +static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab, + size_t offset) +{ + return dmab->area + offset; +} + +#define snd_sgbuf_get_chunk_size(dmab, ofs, size) (size) + +#endif /* CONFIG_SND_DMA_SGBUF */ + +/* allocate/release a buffer */ +int snd_dma_alloc_pages(int type, struct device *dev, size_t size, + struct snd_dma_buffer *dmab); +int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size, + struct snd_dma_buffer *dmab); +void snd_dma_free_pages(struct snd_dma_buffer *dmab); + +#endif /* __SOUND_MEMALLOC_H */ + |