Edit File: memalloc.h
/* * 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 *)(__force 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 */ #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 /* * 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_dma_buffer *dmab, size_t offset) { struct snd_sg_buf *sgbuf = dmab->private_data; dma_addr_t 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; 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 */