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Diffstat (limited to 'include/sound/memalloc.h')
| -rw-r--r-- | include/sound/memalloc.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h new file mode 100644 index 00000000..c4250621 --- /dev/null +++ b/include/sound/memalloc.h @@ -0,0 +1,136 @@ +/* + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + * Takashi Iwai <tiwai@suse.de> + * + * Generic memory allocators + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#ifndef __SOUND_MEMALLOC_H +#define __SOUND_MEMALLOC_H + +struct device; + +/* + * buffer device info + */ +struct snd_dma_device { + int type; /* SNDRV_DMA_TYPE_XXX */ + struct device *dev; /* generic device */ +}; + +#ifndef snd_dma_pci_data +#define snd_dma_pci_data(pci) (&(pci)->dev) +#define snd_dma_isa_data() NULL +#define snd_dma_continuous_data(x) ((struct device *)(unsigned long)(x)) +#endif + + +/* + * 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 */ +#ifdef CONFIG_SND_DMA_SGBUF +#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */ +#else +#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */ +#endif + +/* + * 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 */ +}; + +#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 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; +} + +/* + * return the physical address at the corresponding offset + */ +static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset) +{ + dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; + addr &= PAGE_MASK; + return addr + offset % PAGE_SIZE; +} + +/* + * return the virtual address at the corresponding offset + */ +static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset) +{ + return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_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); + +/* buffer-preservation managements */ + +#define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device) + +size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id); +int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id); + +/* basic memory allocation functions */ +void *snd_malloc_pages(size_t size, gfp_t gfp_flags); +void snd_free_pages(void *ptr, size_t size); + +#endif /* __SOUND_MEMALLOC_H */ + |