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
28 struct 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
42 out:
43 return gang;
44 }
45
46 static 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
54 struct spu_gang *get_spu_gang(struct spu_gang *gang)
55 {
56 kref_get(&gang->kref);
57 return gang;
58 }
59
60 int put_spu_gang(struct spu_gang *gang)
61 {
62 return kref_put(&gang->kref, &destroy_spu_gang);
63 }
64
65 void 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
74 void 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
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