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linux
1/*
2 * linux/include/kmsg_dump.h
3 *
4 * Copyright (C) 2009 Net Insight AB
5 *
6 * Author: Simon Kagstrom <simon.kagstrom@netinsight.net>
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive
10 * for more details.
11 */
12#ifndef _LINUX_KMSG_DUMP_H
13#define _LINUX_KMSG_DUMP_H
14
15#include <linux/errno.h>
16#include <linux/list.h>
17
18/*
19 * Keep this list arranged in rough order of priority. Anything listed after
20 * KMSG_DUMP_OOPS will not be logged by default unless printk.always_kmsg_dump
21 * is passed to the kernel.
22 */
23enum kmsg_dump_reason {
24 KMSG_DUMP_PANIC,
25 KMSG_DUMP_OOPS,
26 KMSG_DUMP_EMERG,
27 KMSG_DUMP_RESTART,
28 KMSG_DUMP_HALT,
29 KMSG_DUMP_POWEROFF,
30};
31
32/**
33 * struct kmsg_dumper - kernel crash message dumper structure
34 * @dump: The callback which gets called on crashes. The buffer is passed
35 * as two sections, where s1 (length l1) contains the older
36 * messages and s2 (length l2) contains the newer.
37 * @list: Entry in the dumper list (private)
38 * @registered: Flag that specifies if this is already registered
39 */
40struct kmsg_dumper {
41 void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
42 const char *s1, unsigned long l1,
43 const char *s2, unsigned long l2);
44 struct list_head list;
45 int registered;
46};
47
48#ifdef CONFIG_PRINTK
49void kmsg_dump(enum kmsg_dump_reason reason);
50
51int kmsg_dump_register(struct kmsg_dumper *dumper);
52
53int kmsg_dump_unregister(struct kmsg_dumper *dumper);
54#else
55static inline void kmsg_dump(enum kmsg_dump_reason reason)
56{
57}
58
59static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
60{
61 return -EINVAL;
62}
63
64static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
65{
66 return -EINVAL;
67}
68#endif
69
70#endif /* _LINUX_KMSG_DUMP_H */