4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
6 * Author: Arnd Bergmann <arndb@de.ibm.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/list.h>
24 #include <linux/slab.h>
28 struct spu_gang *alloc_spu_gang(void)
30 struct spu_gang *gang;
32 gang = kzalloc(sizeof *gang, GFP_KERNEL);
36 kref_init(&gang->kref);
37 mutex_init(&gang->mutex);
38 INIT_LIST_HEAD(&gang->list);
44 static void destroy_spu_gang(struct kref *kref)
46 struct spu_gang *gang;
47 gang = container_of(kref, struct spu_gang, kref);
48 WARN_ON(gang->contexts || !list_empty(&gang->list));
52 struct spu_gang *get_spu_gang(struct spu_gang *gang)
54 kref_get(&gang->kref);
58 int put_spu_gang(struct spu_gang *gang)
60 return kref_put(&gang->kref, &destroy_spu_gang);
63 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
65 mutex_lock(&gang->mutex);
66 ctx->gang = get_spu_gang(gang);
67 list_add(&ctx->gang_list, &gang->list);
69 mutex_unlock(&gang->mutex);
72 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
74 mutex_lock(&gang->mutex);
75 WARN_ON(ctx->gang != gang);
76 list_del_init(&ctx->gang_list);
78 mutex_unlock(&gang->mutex);