162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-or-later */ 262306a36Sopenharmony_ci#ifndef __SOUND_UTIL_MEM_H 362306a36Sopenharmony_ci#define __SOUND_UTIL_MEM_H 462306a36Sopenharmony_ci 562306a36Sopenharmony_ci#include <linux/mutex.h> 662306a36Sopenharmony_ci/* 762306a36Sopenharmony_ci * Copyright (C) 2000 Takashi Iwai <tiwai@suse.de> 862306a36Sopenharmony_ci * 962306a36Sopenharmony_ci * Generic memory management routines for soundcard memory allocation 1062306a36Sopenharmony_ci */ 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ci/* 1362306a36Sopenharmony_ci * memory block 1462306a36Sopenharmony_ci */ 1562306a36Sopenharmony_cistruct snd_util_memblk { 1662306a36Sopenharmony_ci unsigned int size; /* size of this block */ 1762306a36Sopenharmony_ci unsigned int offset; /* zero-offset of this block */ 1862306a36Sopenharmony_ci struct list_head list; /* link */ 1962306a36Sopenharmony_ci}; 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_ci#define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(struct snd_util_memblk)) 2262306a36Sopenharmony_ci 2362306a36Sopenharmony_ci/* 2462306a36Sopenharmony_ci * memory management information 2562306a36Sopenharmony_ci */ 2662306a36Sopenharmony_cistruct snd_util_memhdr { 2762306a36Sopenharmony_ci unsigned int size; /* size of whole data */ 2862306a36Sopenharmony_ci struct list_head block; /* block linked-list header */ 2962306a36Sopenharmony_ci int nblocks; /* # of allocated blocks */ 3062306a36Sopenharmony_ci unsigned int used; /* used memory size */ 3162306a36Sopenharmony_ci int block_extra_size; /* extra data size of chunk */ 3262306a36Sopenharmony_ci struct mutex block_mutex; /* lock */ 3362306a36Sopenharmony_ci}; 3462306a36Sopenharmony_ci 3562306a36Sopenharmony_ci/* 3662306a36Sopenharmony_ci * prototypes 3762306a36Sopenharmony_ci */ 3862306a36Sopenharmony_cistruct snd_util_memhdr *snd_util_memhdr_new(int memsize); 3962306a36Sopenharmony_civoid snd_util_memhdr_free(struct snd_util_memhdr *hdr); 4062306a36Sopenharmony_cistruct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 4162306a36Sopenharmony_ciint snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 4262306a36Sopenharmony_ciint snd_util_mem_avail(struct snd_util_memhdr *hdr); 4362306a36Sopenharmony_ci 4462306a36Sopenharmony_ci/* functions without mutex */ 4562306a36Sopenharmony_cistruct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 4662306a36Sopenharmony_civoid __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 4762306a36Sopenharmony_cistruct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr, 4862306a36Sopenharmony_ci unsigned int units, 4962306a36Sopenharmony_ci struct list_head *prev); 5062306a36Sopenharmony_ci 5162306a36Sopenharmony_ci#endif /* __SOUND_UTIL_MEM_H */ 52