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1/* SPDX-License-Identifier: GPL-2.0-or-later */2#ifndef __SOUND_UTIL_MEM_H3#define __SOUND_UTIL_MEM_H4 5#include <linux/mutex.h>6/*7 * Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>8 *9 * Generic memory management routines for soundcard memory allocation10 */11 12/*13 * memory block14 */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 information25 */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 * prototypes37 */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