18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-or-later */ 28c2ecf20Sopenharmony_ci#ifndef __SOUND_UTIL_MEM_H 38c2ecf20Sopenharmony_ci#define __SOUND_UTIL_MEM_H 48c2ecf20Sopenharmony_ci 58c2ecf20Sopenharmony_ci#include <linux/mutex.h> 68c2ecf20Sopenharmony_ci/* 78c2ecf20Sopenharmony_ci * Copyright (C) 2000 Takashi Iwai <tiwai@suse.de> 88c2ecf20Sopenharmony_ci * 98c2ecf20Sopenharmony_ci * Generic memory management routines for soundcard memory allocation 108c2ecf20Sopenharmony_ci */ 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ci/* 138c2ecf20Sopenharmony_ci * memory block 148c2ecf20Sopenharmony_ci */ 158c2ecf20Sopenharmony_cistruct snd_util_memblk { 168c2ecf20Sopenharmony_ci unsigned int size; /* size of this block */ 178c2ecf20Sopenharmony_ci unsigned int offset; /* zero-offset of this block */ 188c2ecf20Sopenharmony_ci struct list_head list; /* link */ 198c2ecf20Sopenharmony_ci}; 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_ci#define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(struct snd_util_memblk)) 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci/* 248c2ecf20Sopenharmony_ci * memory management information 258c2ecf20Sopenharmony_ci */ 268c2ecf20Sopenharmony_cistruct snd_util_memhdr { 278c2ecf20Sopenharmony_ci unsigned int size; /* size of whole data */ 288c2ecf20Sopenharmony_ci struct list_head block; /* block linked-list header */ 298c2ecf20Sopenharmony_ci int nblocks; /* # of allocated blocks */ 308c2ecf20Sopenharmony_ci unsigned int used; /* used memory size */ 318c2ecf20Sopenharmony_ci int block_extra_size; /* extra data size of chunk */ 328c2ecf20Sopenharmony_ci struct mutex block_mutex; /* lock */ 338c2ecf20Sopenharmony_ci}; 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci/* 368c2ecf20Sopenharmony_ci * prototypes 378c2ecf20Sopenharmony_ci */ 388c2ecf20Sopenharmony_cistruct snd_util_memhdr *snd_util_memhdr_new(int memsize); 398c2ecf20Sopenharmony_civoid snd_util_memhdr_free(struct snd_util_memhdr *hdr); 408c2ecf20Sopenharmony_cistruct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 418c2ecf20Sopenharmony_ciint snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 428c2ecf20Sopenharmony_ciint snd_util_mem_avail(struct snd_util_memhdr *hdr); 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ci/* functions without mutex */ 458c2ecf20Sopenharmony_cistruct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 468c2ecf20Sopenharmony_civoid __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 478c2ecf20Sopenharmony_cistruct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr, 488c2ecf20Sopenharmony_ci unsigned int units, 498c2ecf20Sopenharmony_ci struct list_head *prev); 508c2ecf20Sopenharmony_ci 518c2ecf20Sopenharmony_ci#endif /* __SOUND_UTIL_MEM_H */ 52