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_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 */ 40 struct 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 49 void kmsg_dump(enum kmsg_dump_reason reason); 50 51 int kmsg_dump_register(struct kmsg_dumper *dumper); 52 53 int kmsg_dump_unregister(struct kmsg_dumper *dumper); 54 #else 55 static inline void kmsg_dump(enum kmsg_dump_reason reason) 56 { 57 } 58 59 static inline int kmsg_dump_register(struct kmsg_dumper *dumper) 60 { 61 return -EINVAL; 62 } 63 64 static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper) 65 { 66 return -EINVAL; 67 } 68 #endif 69 70 #endif /* _LINUX_KMSG_DUMP_H */ 71