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 
alloc_spu_gang(void)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 
destroy_spu_gang(struct kref * kref)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 
get_spu_gang(struct spu_gang * gang)54 struct spu_gang *get_spu_gang(struct spu_gang *gang)
55 {
56 	kref_get(&gang->kref);
57 	return gang;
58 }
59 
put_spu_gang(struct spu_gang * gang)60 int put_spu_gang(struct spu_gang *gang)
61 {
62 	return kref_put(&gang->kref, &destroy_spu_gang);
63 }
64 
spu_gang_add_ctx(struct spu_gang * gang,struct spu_context * ctx)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 
spu_gang_remove_ctx(struct spu_gang * gang,struct spu_context * ctx)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