include/linux/kmsg_dump.h

   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  */
  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 */