11a59d1b8SThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-or-later */ 21da177e4SLinus Torvalds #ifndef __SOUND_UTIL_MEM_H 31da177e4SLinus Torvalds #define __SOUND_UTIL_MEM_H 4ef9f0a42SIngo Molnar 5ef9f0a42SIngo Molnar #include <linux/mutex.h> 61da177e4SLinus Torvalds /* 71da177e4SLinus Torvalds * Copyright (C) 2000 Takashi Iwai <tiwai@suse.de> 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Generic memory management routines for soundcard memory allocation 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds /* 131da177e4SLinus Torvalds * memory block 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds struct snd_util_memblk { 1603da312aSTakashi Iwai unsigned int size; /* size of this block */ 1703da312aSTakashi Iwai unsigned int offset; /* zero-offset of this block */ 181da177e4SLinus Torvalds struct list_head list; /* link */ 191da177e4SLinus Torvalds }; 201da177e4SLinus Torvalds 2103da312aSTakashi Iwai #define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(struct snd_util_memblk)) 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds /* 241da177e4SLinus Torvalds * memory management information 251da177e4SLinus Torvalds */ 261da177e4SLinus Torvalds struct snd_util_memhdr { 2703da312aSTakashi Iwai unsigned int size; /* size of whole data */ 281da177e4SLinus Torvalds struct list_head block; /* block linked-list header */ 291da177e4SLinus Torvalds int nblocks; /* # of allocated blocks */ 3003da312aSTakashi Iwai unsigned int used; /* used memory size */ 311da177e4SLinus Torvalds int block_extra_size; /* extra data size of chunk */ 32ef9f0a42SIngo Molnar struct mutex block_mutex; /* lock */ 331da177e4SLinus Torvalds }; 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds /* 361da177e4SLinus Torvalds * prototypes 371da177e4SLinus Torvalds */ 3803da312aSTakashi Iwai struct snd_util_memhdr *snd_util_memhdr_new(int memsize); 3903da312aSTakashi Iwai void snd_util_memhdr_free(struct snd_util_memhdr *hdr); 4003da312aSTakashi Iwai struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 4103da312aSTakashi Iwai int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 4203da312aSTakashi Iwai int snd_util_mem_avail(struct snd_util_memhdr *hdr); 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds /* functions without mutex */ 4503da312aSTakashi Iwai struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 4603da312aSTakashi Iwai void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 4703da312aSTakashi Iwai struct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr, 4803da312aSTakashi Iwai unsigned int units, 4903da312aSTakashi Iwai struct list_head *prev); 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds #endif /* __SOUND_UTIL_MEM_H */ 52