1 /* 2 * linux/include/kmsg_dump.h 3 * 4 * Copyright (C) 2009 Net Insight AB 5 * 6 * Author: Simon Kagstrom <[email protected]> 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 */ 23 enum kmsg_dump_reason { 24 KMSG_DUMP_UNDEF, 25 KMSG_DUMP_PANIC, 26 KMSG_DUMP_OOPS, 27 KMSG_DUMP_EMERG, 28 KMSG_DUMP_SHUTDOWN, 29 KMSG_DUMP_MAX 30 }; 31 32 /** 33 * struct kmsg_dumper - kernel crash message dumper structure 34 * @list: Entry in the dumper list (private) 35 * @dump: Call into dumping code which will retrieve the data with 36 * through the record iterator 37 * @max_reason: filter for highest reason number that should be dumped 38 * @registered: Flag that specifies if this is already registered 39 */ 40 struct kmsg_dumper { 41 struct list_head list; 42 void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason); 43 enum kmsg_dump_reason max_reason; 44 bool active; 45 bool registered; 46 47 /* private state of the kmsg iterator */ 48 u32 cur_idx; 49 u32 next_idx; 50 u64 cur_seq; 51 u64 next_seq; 52 }; 53 54 #ifdef CONFIG_PRINTK 55 void kmsg_dump(enum kmsg_dump_reason reason); 56 57 bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, bool syslog, 58 char *line, size_t size, size_t *len); 59 60 bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog, 61 char *line, size_t size, size_t *len); 62 63 bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog, 64 char *buf, size_t size, size_t *len); 65 66 void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper); 67 68 void kmsg_dump_rewind(struct kmsg_dumper *dumper); 69 70 int kmsg_dump_register(struct kmsg_dumper *dumper); 71 72 int kmsg_dump_unregister(struct kmsg_dumper *dumper); 73 #else 74 static inline void kmsg_dump(enum kmsg_dump_reason reason) 75 { 76 } 77 78 static inline bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, 79 bool syslog, const char *line, 80 size_t size, size_t *len) 81 { 82 return false; 83 } 84 85 static inline bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog, 86 const char *line, size_t size, size_t *len) 87 { 88 return false; 89 } 90 91 static inline bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog, 92 char *buf, size_t size, size_t *len) 93 { 94 return false; 95 } 96 97 static inline void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper) 98 { 99 } 100 101 static inline void kmsg_dump_rewind(struct kmsg_dumper *dumper) 102 { 103 } 104 105 static inline int kmsg_dump_register(struct kmsg_dumper *dumper) 106 { 107 return -EINVAL; 108 } 109 110 static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper) 111 { 112 return -EINVAL; 113 } 114 #endif 115 116 #endif /* _LINUX_KMSG_DUMP_H */ 117