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456b565c SK |
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 | ||
ac562241 | 15 | #include <linux/errno.h> |
456b565c SK |
16 | #include <linux/list.h> |
17 | ||
c22ab332 MG |
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 | */ | |
456b565c | 23 | enum kmsg_dump_reason { |
e2ae715d | 24 | KMSG_DUMP_UNDEF, |
456b565c | 25 | KMSG_DUMP_PANIC, |
c22ab332 MG |
26 | KMSG_DUMP_OOPS, |
27 | KMSG_DUMP_EMERG, | |
6d3cf962 | 28 | KMSG_DUMP_SHUTDOWN, |
b1f6f161 | 29 | KMSG_DUMP_MAX |
456b565c SK |
30 | }; |
31 | ||
f9f3f02d JO |
32 | /** |
33 | * struct kmsg_dump_iter - iterator for retrieving kernel messages | |
34 | * @cur_seq: Points to the oldest message to dump | |
35 | * @next_seq: Points after the newest message to dump | |
36 | */ | |
37 | struct kmsg_dump_iter { | |
38 | u64 cur_seq; | |
39 | u64 next_seq; | |
40 | }; | |
41 | ||
456b565c SK |
42 | /** |
43 | * struct kmsg_dumper - kernel crash message dumper structure | |
456b565c | 44 | * @list: Entry in the dumper list (private) |
e2ae715d KS |
45 | * @dump: Call into dumping code which will retrieve the data with |
46 | * through the record iterator | |
47 | * @max_reason: filter for highest reason number that should be dumped | |
456b565c SK |
48 | * @registered: Flag that specifies if this is already registered |
49 | */ | |
50 | struct kmsg_dumper { | |
456b565c | 51 | struct list_head list; |
e2ae715d KS |
52 | void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason); |
53 | enum kmsg_dump_reason max_reason; | |
e2ae715d | 54 | bool registered; |
456b565c SK |
55 | }; |
56 | ||
595dd3d8 | 57 | #ifdef CONFIG_PRINTK |
456b565c SK |
58 | void kmsg_dump(enum kmsg_dump_reason reason); |
59 | ||
f9f3f02d | 60 | bool kmsg_dump_get_line(struct kmsg_dump_iter *iter, bool syslog, |
e2ae715d KS |
61 | char *line, size_t size, size_t *len); |
62 | ||
f9f3f02d | 63 | bool kmsg_dump_get_buffer(struct kmsg_dump_iter *iter, bool syslog, |
726b5097 | 64 | char *buf, size_t size, size_t *len_out); |
e2ae715d | 65 | |
f9f3f02d | 66 | void kmsg_dump_rewind(struct kmsg_dump_iter *iter); |
e2ae715d | 67 | |
456b565c SK |
68 | int kmsg_dump_register(struct kmsg_dumper *dumper); |
69 | ||
70 | int kmsg_dump_unregister(struct kmsg_dumper *dumper); | |
fb13cb8a KC |
71 | |
72 | const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason); | |
595dd3d8 RD |
73 | #else |
74 | static inline void kmsg_dump(enum kmsg_dump_reason reason) | |
75 | { | |
76 | } | |
77 | ||
f9f3f02d | 78 | static inline bool kmsg_dump_get_line(struct kmsg_dump_iter *iter, bool syslog, |
246f6f2f | 79 | const char *line, size_t size, size_t *len) |
e2ae715d KS |
80 | { |
81 | return false; | |
82 | } | |
83 | ||
f9f3f02d | 84 | static inline bool kmsg_dump_get_buffer(struct kmsg_dump_iter *iter, bool syslog, |
246f6f2f | 85 | char *buf, size_t size, size_t *len) |
e2ae715d KS |
86 | { |
87 | return false; | |
88 | } | |
89 | ||
f9f3f02d | 90 | static inline void kmsg_dump_rewind(struct kmsg_dump_iter *iter) |
e2ae715d KS |
91 | { |
92 | } | |
93 | ||
595dd3d8 RD |
94 | static inline int kmsg_dump_register(struct kmsg_dumper *dumper) |
95 | { | |
96 | return -EINVAL; | |
97 | } | |
98 | ||
99 | static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper) | |
100 | { | |
101 | return -EINVAL; | |
102 | } | |
fb13cb8a KC |
103 | |
104 | static inline const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason) | |
105 | { | |
106 | return "Disabled"; | |
107 | } | |
595dd3d8 | 108 | #endif |
456b565c SK |
109 | |
110 | #endif /* _LINUX_KMSG_DUMP_H */ |