1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */ 2*4882a593Smuzhiyun #ifndef __SOUND_UTIL_MEM_H 3*4882a593Smuzhiyun #define __SOUND_UTIL_MEM_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/mutex.h> 6*4882a593Smuzhiyun /* 7*4882a593Smuzhiyun * Copyright (C) 2000 Takashi Iwai <tiwai@suse.de> 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * Generic memory management routines for soundcard memory allocation 10*4882a593Smuzhiyun */ 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun /* 13*4882a593Smuzhiyun * memory block 14*4882a593Smuzhiyun */ 15*4882a593Smuzhiyun struct snd_util_memblk { 16*4882a593Smuzhiyun unsigned int size; /* size of this block */ 17*4882a593Smuzhiyun unsigned int offset; /* zero-offset of this block */ 18*4882a593Smuzhiyun struct list_head list; /* link */ 19*4882a593Smuzhiyun }; 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun #define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(struct snd_util_memblk)) 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun /* 24*4882a593Smuzhiyun * memory management information 25*4882a593Smuzhiyun */ 26*4882a593Smuzhiyun struct snd_util_memhdr { 27*4882a593Smuzhiyun unsigned int size; /* size of whole data */ 28*4882a593Smuzhiyun struct list_head block; /* block linked-list header */ 29*4882a593Smuzhiyun int nblocks; /* # of allocated blocks */ 30*4882a593Smuzhiyun unsigned int used; /* used memory size */ 31*4882a593Smuzhiyun int block_extra_size; /* extra data size of chunk */ 32*4882a593Smuzhiyun struct mutex block_mutex; /* lock */ 33*4882a593Smuzhiyun }; 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun /* 36*4882a593Smuzhiyun * prototypes 37*4882a593Smuzhiyun */ 38*4882a593Smuzhiyun struct snd_util_memhdr *snd_util_memhdr_new(int memsize); 39*4882a593Smuzhiyun void snd_util_memhdr_free(struct snd_util_memhdr *hdr); 40*4882a593Smuzhiyun struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 41*4882a593Smuzhiyun int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 42*4882a593Smuzhiyun int snd_util_mem_avail(struct snd_util_memhdr *hdr); 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun /* functions without mutex */ 45*4882a593Smuzhiyun struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 46*4882a593Smuzhiyun void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 47*4882a593Smuzhiyun struct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr, 48*4882a593Smuzhiyun unsigned int units, 49*4882a593Smuzhiyun struct list_head *prev); 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun #endif /* __SOUND_UTIL_MEM_H */ 52