linux/include/sound/memalloc.h
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   1/*
   2 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   3 *                   Takashi Iwai <tiwai@suse.de>
   4 * 
   5 *  Generic memory allocators
   6 *
   7 *
   8 *   This program is free software; you can redistribute it and/or modify
   9 *   it under the terms of the GNU General Public License as published by
  10 *   the Free Software Foundation; either version 2 of the License, or
  11 *   (at your option) any later version.
  12 *
  13 *   This program is distributed in the hope that it will be useful,
  14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *   GNU General Public License for more details.
  17 *
  18 *   You should have received a copy of the GNU General Public License
  19 *   along with this program; if not, write to the Free Software
  20 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21 *
  22 */
  23
  24#ifndef __SOUND_MEMALLOC_H
  25#define __SOUND_MEMALLOC_H
  26
  27struct device;
  28
  29/*
  30 * buffer device info
  31 */
  32struct snd_dma_device {
  33        int type;                       /* SNDRV_DMA_TYPE_XXX */
  34        struct device *dev;             /* generic device */
  35};
  36
  37#ifndef snd_dma_pci_data
  38#define snd_dma_pci_data(pci)   (&(pci)->dev)
  39#define snd_dma_isa_data()      NULL
  40#define snd_dma_continuous_data(x)      ((struct device *)(unsigned long)(x))
  41#endif
  42
  43
  44/*
  45 * buffer types
  46 */
  47#define SNDRV_DMA_TYPE_UNKNOWN          0       /* not defined */
  48#define SNDRV_DMA_TYPE_CONTINUOUS       1       /* continuous no-DMA memory */
  49#define SNDRV_DMA_TYPE_DEV              2       /* generic device continuous */
  50#ifdef CONFIG_SND_DMA_SGBUF
  51#define SNDRV_DMA_TYPE_DEV_SG           3       /* generic device SG-buffer */
  52#else
  53#define SNDRV_DMA_TYPE_DEV_SG   SNDRV_DMA_TYPE_DEV /* no SG-buf support */
  54#endif
  55
  56/*
  57 * info for buffer allocation
  58 */
  59struct snd_dma_buffer {
  60        struct snd_dma_device dev;      /* device type */
  61        unsigned char *area;    /* virtual pointer */
  62        dma_addr_t addr;        /* physical address */
  63        size_t bytes;           /* buffer size in bytes */
  64        void *private_data;     /* private for allocator; don't touch */
  65};
  66
  67#ifdef CONFIG_SND_DMA_SGBUF
  68/*
  69 * Scatter-Gather generic device pages
  70 */
  71void *snd_malloc_sgbuf_pages(struct device *device,
  72                             size_t size, struct snd_dma_buffer *dmab,
  73                             size_t *res_size);
  74int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
  75
  76struct snd_sg_page {
  77        void *buf;
  78        dma_addr_t addr;
  79};
  80
  81struct snd_sg_buf {
  82        int size;       /* allocated byte size */
  83        int pages;      /* allocated pages */
  84        int tblsize;    /* allocated table size */
  85        struct snd_sg_page *table;      /* address table */
  86        struct page **page_table;       /* page table (for vmap/vunmap) */
  87        struct device *dev;
  88};
  89
  90/*
  91 * return the pages matching with the given byte size
  92 */
  93static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
  94{
  95        return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
  96}
  97
  98/*
  99 * return the physical address at the corresponding offset
 100 */
 101static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
 102{
 103        dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
 104        addr &= PAGE_MASK;
 105        return addr + offset % PAGE_SIZE;
 106}
 107
 108/*
 109 * return the virtual address at the corresponding offset
 110 */
 111static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset)
 112{
 113        return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
 114}
 115#endif /* CONFIG_SND_DMA_SGBUF */
 116
 117/* allocate/release a buffer */
 118int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
 119                        struct snd_dma_buffer *dmab);
 120int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
 121                                 struct snd_dma_buffer *dmab);
 122void snd_dma_free_pages(struct snd_dma_buffer *dmab);
 123
 124/* buffer-preservation managements */
 125
 126#define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
 127
 128size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
 129int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
 130
 131/* basic memory allocation functions */
 132void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
 133void snd_free_pages(void *ptr, size_t size);
 134
 135#endif /* __SOUND_MEMALLOC_H */
 136
 137
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