1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * SPU file system
4  *
5  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
6  *
7  * Author: Arnd Bergmann <arndb@de.ibm.com>
8  */
9 
10 #include <linux/list.h>
11 #include <linux/slab.h>
12 
13 #include "spufs.h"
14 
alloc_spu_gang(void)15 struct spu_gang *alloc_spu_gang(void)
16 {
17 	struct spu_gang *gang;
18 
19 	gang = kzalloc(sizeof *gang, GFP_KERNEL);
20 	if (!gang)
21 		goto out;
22 
23 	kref_init(&gang->kref);
24 	mutex_init(&gang->mutex);
25 	mutex_init(&gang->aff_mutex);
26 	INIT_LIST_HEAD(&gang->list);
27 	INIT_LIST_HEAD(&gang->aff_list_head);
28 
29 out:
30 	return gang;
31 }
32 
destroy_spu_gang(struct kref * kref)33 static void destroy_spu_gang(struct kref *kref)
34 {
35 	struct spu_gang *gang;
36 	gang = container_of(kref, struct spu_gang, kref);
37 	WARN_ON(gang->contexts || !list_empty(&gang->list));
38 	kfree(gang);
39 }
40 
get_spu_gang(struct spu_gang * gang)41 struct spu_gang *get_spu_gang(struct spu_gang *gang)
42 {
43 	kref_get(&gang->kref);
44 	return gang;
45 }
46 
put_spu_gang(struct spu_gang * gang)47 int put_spu_gang(struct spu_gang *gang)
48 {
49 	return kref_put(&gang->kref, &destroy_spu_gang);
50 }
51 
spu_gang_add_ctx(struct spu_gang * gang,struct spu_context * ctx)52 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
53 {
54 	mutex_lock(&gang->mutex);
55 	ctx->gang = get_spu_gang(gang);
56 	list_add(&ctx->gang_list, &gang->list);
57 	gang->contexts++;
58 	mutex_unlock(&gang->mutex);
59 }
60 
spu_gang_remove_ctx(struct spu_gang * gang,struct spu_context * ctx)61 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
62 {
63 	mutex_lock(&gang->mutex);
64 	WARN_ON(ctx->gang != gang);
65 	if (!list_empty(&ctx->aff_list)) {
66 		list_del_init(&ctx->aff_list);
67 		gang->aff_flags &= ~AFF_OFFSETS_SET;
68 	}
69 	list_del_init(&ctx->gang_list);
70 	gang->contexts--;
71 	mutex_unlock(&gang->mutex);
72 
73 	put_spu_gang(gang);
74 }
75