kernel-ark/sound/synth/util_mem.c
Takashi Iwai 561b220a4d [ALSA] Replace with kzalloc() - others
Documentation,SA11xx UDA1341 driver,Generic drivers,MPU401 UART,OPL3
OPL4,Digigram VX core,I2C cs8427,I2C lib core,I2C tea6330t,L3 drivers
AK4114 receiver,AK4117 receiver,PDAudioCF driver,PPC PMAC driver
SPARC AMD7930 driver,SPARC cs4231 driver,Synth,Common EMU synth
USB generic driver,USB USX2Y
Replace kcalloc(1,..) with kzalloc().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2005-09-12 10:48:22 +02:00

208 lines
4.4 KiB
C

/*
* Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
*
* Generic memory management routines for soundcard memory allocation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sound/driver.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/util_mem.h>
MODULE_AUTHOR("Takashi Iwai");
MODULE_DESCRIPTION("Generic memory management routines for soundcard memory allocation");
MODULE_LICENSE("GPL");
#define get_memblk(p) list_entry(p, snd_util_memblk_t, list)
/*
* create a new memory manager
*/
snd_util_memhdr_t *
snd_util_memhdr_new(int memsize)
{
snd_util_memhdr_t *hdr;
hdr = kzalloc(sizeof(*hdr), GFP_KERNEL);
if (hdr == NULL)
return NULL;
hdr->size = memsize;
init_MUTEX(&hdr->block_mutex);
INIT_LIST_HEAD(&hdr->block);
return hdr;
}
/*
* free a memory manager
*/
void snd_util_memhdr_free(snd_util_memhdr_t *hdr)
{
struct list_head *p;
snd_assert(hdr != NULL, return);
/* release all blocks */
while ((p = hdr->block.next) != &hdr->block) {
list_del(p);
kfree(get_memblk(p));
}
kfree(hdr);
}
/*
* allocate a memory block (without mutex)
*/
snd_util_memblk_t *
__snd_util_mem_alloc(snd_util_memhdr_t *hdr, int size)
{
snd_util_memblk_t *blk;
snd_util_unit_t units, prev_offset;
struct list_head *p;
snd_assert(hdr != NULL, return NULL);
snd_assert(size > 0, return NULL);
/* word alignment */
units = size;
if (units & 1)
units++;
if (units > hdr->size)
return NULL;
/* look for empty block */
prev_offset = 0;
list_for_each(p, &hdr->block) {
blk = get_memblk(p);
if (blk->offset - prev_offset >= units)
goto __found;
prev_offset = blk->offset + blk->size;
}
if (hdr->size - prev_offset < units)
return NULL;
__found:
return __snd_util_memblk_new(hdr, units, p->prev);
}
/*
* create a new memory block with the given size
* the block is linked next to prev
*/
snd_util_memblk_t *
__snd_util_memblk_new(snd_util_memhdr_t *hdr, snd_util_unit_t units,
struct list_head *prev)
{
snd_util_memblk_t *blk;
blk = kmalloc(sizeof(snd_util_memblk_t) + hdr->block_extra_size, GFP_KERNEL);
if (blk == NULL)
return NULL;
if (! prev || prev == &hdr->block)
blk->offset = 0;
else {
snd_util_memblk_t *p = get_memblk(prev);
blk->offset = p->offset + p->size;
}
blk->size = units;
list_add(&blk->list, prev);
hdr->nblocks++;
hdr->used += units;
return blk;
}
/*
* allocate a memory block (with mutex)
*/
snd_util_memblk_t *
snd_util_mem_alloc(snd_util_memhdr_t *hdr, int size)
{
snd_util_memblk_t *blk;
down(&hdr->block_mutex);
blk = __snd_util_mem_alloc(hdr, size);
up(&hdr->block_mutex);
return blk;
}
/*
* remove the block from linked-list and free resource
* (without mutex)
*/
void
__snd_util_mem_free(snd_util_memhdr_t *hdr, snd_util_memblk_t *blk)
{
list_del(&blk->list);
hdr->nblocks--;
hdr->used -= blk->size;
kfree(blk);
}
/*
* free a memory block (with mutex)
*/
int snd_util_mem_free(snd_util_memhdr_t *hdr, snd_util_memblk_t *blk)
{
snd_assert(hdr && blk, return -EINVAL);
down(&hdr->block_mutex);
__snd_util_mem_free(hdr, blk);
up(&hdr->block_mutex);
return 0;
}
/*
* return available memory size
*/
int snd_util_mem_avail(snd_util_memhdr_t *hdr)
{
unsigned int size;
down(&hdr->block_mutex);
size = hdr->size - hdr->used;
up(&hdr->block_mutex);
return size;
}
EXPORT_SYMBOL(snd_util_memhdr_new);
EXPORT_SYMBOL(snd_util_memhdr_free);
EXPORT_SYMBOL(snd_util_mem_alloc);
EXPORT_SYMBOL(snd_util_mem_free);
EXPORT_SYMBOL(snd_util_mem_avail);
EXPORT_SYMBOL(__snd_util_mem_alloc);
EXPORT_SYMBOL(__snd_util_mem_free);
EXPORT_SYMBOL(__snd_util_memblk_new);
/*
* INIT part
*/
static int __init alsa_util_mem_init(void)
{
return 0;
}
static void __exit alsa_util_mem_exit(void)
{
}
module_init(alsa_util_mem_init)
module_exit(alsa_util_mem_exit)