Merge branch 'drm-patches' of master.kernel.org:/pub/scm/linux/kernel/git/airlied...
[linux-drm-fsl-dcu.git] / arch / powerpc / platforms / cell / spu_coredump.c
1 /*
2  * SPU core dump code
3  *
4  * (C) Copyright 2006 IBM Corp.
5  *
6  * Author: Dwayne Grant McConnell <decimal@us.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/file.h>
24 #include <linux/module.h>
25 #include <linux/syscalls.h>
26
27 #include <asm/spu.h>
28
29 static struct spu_coredump_calls *spu_coredump_calls;
30 static DEFINE_MUTEX(spu_coredump_mutex);
31
32 int arch_notes_size(void)
33 {
34         long ret;
35
36         ret = -ENOSYS;
37         mutex_lock(&spu_coredump_mutex);
38         if (spu_coredump_calls && try_module_get(spu_coredump_calls->owner)) {
39                 ret = spu_coredump_calls->arch_notes_size();
40                 module_put(spu_coredump_calls->owner);
41         }
42         mutex_unlock(&spu_coredump_mutex);
43         return ret;
44 }
45
46 void arch_write_notes(struct file *file)
47 {
48         mutex_lock(&spu_coredump_mutex);
49         if (spu_coredump_calls && try_module_get(spu_coredump_calls->owner)) {
50                 spu_coredump_calls->arch_write_notes(file);
51                 module_put(spu_coredump_calls->owner);
52         }
53         mutex_unlock(&spu_coredump_mutex);
54 }
55
56 int register_arch_coredump_calls(struct spu_coredump_calls *calls)
57 {
58         int ret = 0;
59
60
61         mutex_lock(&spu_coredump_mutex);
62         if (spu_coredump_calls)
63                 ret = -EBUSY;
64         else
65                 spu_coredump_calls = calls;
66         mutex_unlock(&spu_coredump_mutex);
67         return ret;
68 }
69 EXPORT_SYMBOL_GPL(register_arch_coredump_calls);
70
71 void unregister_arch_coredump_calls(struct spu_coredump_calls *calls)
72 {
73         BUG_ON(spu_coredump_calls != calls);
74
75         mutex_lock(&spu_coredump_mutex);
76         spu_coredump_calls = NULL;
77         mutex_unlock(&spu_coredump_mutex);
78 }
79 EXPORT_SYMBOL_GPL(unregister_arch_coredump_calls);