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
15struct 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(kref: &gang->kref);
24 mutex_init(&gang->mutex);
25 mutex_init(&gang->aff_mutex);
26 INIT_LIST_HEAD(list: &gang->list);
27 INIT_LIST_HEAD(list: &gang->aff_list_head);
28 gang->alive = 1;
29
30out:
31 return gang;
32}
33
34static void destroy_spu_gang(struct kref *kref)
35{
36 struct spu_gang *gang;
37 gang = container_of(kref, struct spu_gang, kref);
38 WARN_ON(gang->contexts || !list_empty(&gang->list));
39 kfree(objp: gang);
40}
41
42struct spu_gang *get_spu_gang(struct spu_gang *gang)
43{
44 kref_get(kref: &gang->kref);
45 return gang;
46}
47
48int put_spu_gang(struct spu_gang *gang)
49{
50 return kref_put(kref: &gang->kref, release: &destroy_spu_gang);
51}
52
53void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
54{
55 mutex_lock(&gang->mutex);
56 ctx->gang = get_spu_gang(gang);
57 list_add(new: &ctx->gang_list, head: &gang->list);
58 gang->contexts++;
59 mutex_unlock(lock: &gang->mutex);
60}
61
62void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
63{
64 mutex_lock(&gang->mutex);
65 WARN_ON(ctx->gang != gang);
66 if (!list_empty(head: &ctx->aff_list)) {
67 list_del_init(entry: &ctx->aff_list);
68 gang->aff_flags &= ~AFF_OFFSETS_SET;
69 }
70 list_del_init(entry: &ctx->gang_list);
71 gang->contexts--;
72 mutex_unlock(lock: &gang->mutex);
73
74 put_spu_gang(gang);
75}
76

source code of linux/arch/powerpc/platforms/cell/spufs/gang.c