1/*
2 * SPU file system
3 *
4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
5 *
6 * Author: Arnd Bergmann <arndb@de.ibm.com>
7 *
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)
11 * any later version.
12 *
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.
17 *
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.
21 */
22
23#include <linux/list.h>
24#include <linux/slab.h>
25
26#include "spufs.h"
27
28struct spu_gang *alloc_spu_gang(void)
29{
30	struct spu_gang *gang;
31
32	gang = kzalloc(sizeof *gang, GFP_KERNEL);
33	if (!gang)
34		goto out;
35
36	kref_init(&gang->kref);
37	mutex_init(&gang->mutex);
38	mutex_init(&gang->aff_mutex);
39	INIT_LIST_HEAD(&gang->list);
40	INIT_LIST_HEAD(&gang->aff_list_head);
41
42out:
43	return gang;
44}
45
46static void destroy_spu_gang(struct kref *kref)
47{
48	struct spu_gang *gang;
49	gang = container_of(kref, struct spu_gang, kref);
50	WARN_ON(gang->contexts || !list_empty(&gang->list));
51	kfree(gang);
52}
53
54struct spu_gang *get_spu_gang(struct spu_gang *gang)
55{
56	kref_get(&gang->kref);
57	return gang;
58}
59
60int put_spu_gang(struct spu_gang *gang)
61{
62	return kref_put(&gang->kref, &destroy_spu_gang);
63}
64
65void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
66{
67	mutex_lock(&gang->mutex);
68	ctx->gang = get_spu_gang(gang);
69	list_add(&ctx->gang_list, &gang->list);
70	gang->contexts++;
71	mutex_unlock(&gang->mutex);
72}
73
74void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
75{
76	mutex_lock(&gang->mutex);
77	WARN_ON(ctx->gang != gang);
78	if (!list_empty(&ctx->aff_list)) {
79		list_del_init(&ctx->aff_list);
80		gang->aff_flags &= ~AFF_OFFSETS_SET;
81	}
82	list_del_init(&ctx->gang_list);
83	gang->contexts--;
84	mutex_unlock(&gang->mutex);
85
86	put_spu_gang(gang);
87}
88