LXR linux/include/sound/util

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2#ifndef __SOUND_UTIL_MEM_H
   3#define __SOUND_UTIL_MEM_H
   4
   5#include <linux/mutex.h>
   6/*
   7 *  Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
   8 *
   9 *  Generic memory management routines for soundcard memory allocation
  10 */
  11
  12/*
  13 * memory block
  14 */
  15struct snd_util_memblk {
  16        unsigned int size;              /* size of this block */
  17        unsigned int offset;            /* zero-offset of this block */
  18        struct list_head list;          /* link */
  19};
  20
  21#define snd_util_memblk_argptr(blk)     (void*)((char*)(blk) + sizeof(struct snd_util_memblk))
  22
  23/*
  24 * memory management information
  25 */
  26struct snd_util_memhdr {
  27        unsigned int size;              /* size of whole data */
  28        struct list_head block;         /* block linked-list header */
  29        int nblocks;                    /* # of allocated blocks */
  30        unsigned int used;              /* used memory size */
  31        int block_extra_size;           /* extra data size of chunk */
  32        struct mutex block_mutex;       /* lock */
  33};
  34
  35/*
  36 * prototypes
  37 */
  38struct snd_util_memhdr *snd_util_memhdr_new(int memsize);
  39void snd_util_memhdr_free(struct snd_util_memhdr *hdr);
  40struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
  41int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
  42int snd_util_mem_avail(struct snd_util_memhdr *hdr);
  43
  44/* functions without mutex */
  45struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
  46void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
  47struct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr,
  48                                              unsigned int units,
  49                                              struct list_head *prev);
  50
  51#endif /* __SOUND_UTIL_MEM_H */
  52