82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/*
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* SPU file system
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
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*
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* Author: Arnd Bergmann <arndb@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/list.h>
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#include <linux/slab.h>
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#include "spufs.h"
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struct spu_gang *alloc_spu_gang(void)
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{
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struct spu_gang *gang;
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gang = kzalloc(sizeof *gang, GFP_KERNEL);
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if (!gang)
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goto out;
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kref_init(&gang->kref);
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mutex_init(&gang->mutex);
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INIT_LIST_HEAD(&gang->list);
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out:
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return gang;
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}
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static void destroy_spu_gang(struct kref *kref)
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{
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struct spu_gang *gang;
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gang = container_of(kref, struct spu_gang, kref);
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WARN_ON(gang->contexts || !list_empty(&gang->list));
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kfree(gang);
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}
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struct spu_gang *get_spu_gang(struct spu_gang *gang)
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{
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kref_get(&gang->kref);
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return gang;
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}
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int put_spu_gang(struct spu_gang *gang)
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{
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return kref_put(&gang->kref, &destroy_spu_gang);
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}
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void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
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{
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mutex_lock(&gang->mutex);
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ctx->gang = get_spu_gang(gang);
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list_add(&ctx->gang_list, &gang->list);
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gang->contexts++;
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mutex_unlock(&gang->mutex);
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}
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void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
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{
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mutex_lock(&gang->mutex);
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WARN_ON(ctx->gang != gang);
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list_del_init(&ctx->gang_list);
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gang->contexts--;
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mutex_unlock(&gang->mutex);
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put_spu_gang(gang);
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}
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