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kernel add
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/*
* SPU file system
*
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
*
* Author: Arnd Bergmann <arndb@de.ibm.com>
*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/list.h>
#include <linux/slab.h>
#include "spufs.h"
struct spu_gang *alloc_spu_gang(void)
{
struct spu_gang *gang;
gang = kzalloc(sizeof *gang, GFP_KERNEL);
if (!gang)
goto out;
kref_init(&gang->kref);
mutex_init(&gang->mutex);
mutex_init(&gang->aff_mutex);
INIT_LIST_HEAD(&gang->list);
INIT_LIST_HEAD(&gang->aff_list_head);
out:
return gang;
}
static void destroy_spu_gang(struct kref *kref)
{
struct spu_gang *gang;
gang = container_of(kref, struct spu_gang, kref);
WARN_ON(gang->contexts || !list_empty(&gang->list));
kfree(gang);
}
struct spu_gang *get_spu_gang(struct spu_gang *gang)
{
kref_get(&gang->kref);
return gang;
}
int put_spu_gang(struct spu_gang *gang)
{
return kref_put(&gang->kref, &destroy_spu_gang);
}
void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
{
mutex_lock(&gang->mutex);
ctx->gang = get_spu_gang(gang);
list_add(&ctx->gang_list, &gang->list);
gang->contexts++;
mutex_unlock(&gang->mutex);
}
void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
{
mutex_lock(&gang->mutex);
WARN_ON(ctx->gang != gang);
if (!list_empty(&ctx->aff_list)) {
list_del_init(&ctx->aff_list);
gang->aff_flags &= ~AFF_OFFSETS_SET;
}
list_del_init(&ctx->gang_list);
gang->contexts--;
mutex_unlock(&gang->mutex);
put_spu_gang(gang);
}
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