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
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