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 */ 15 struct 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 */ 26 struct 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 */ 38 struct snd_util_memhdr *snd_util_memhdr_new(int memsize); 39 void snd_util_memhdr_free(struct snd_util_memhdr *hdr); 40 struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 41 int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 42 int snd_util_mem_avail(struct snd_util_memhdr *hdr); 43 44 /* functions without mutex */ 45 struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 46 void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 47 struct 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