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Diffstat (limited to 'kernel/include/linux/kmsg_dump.h')
-rw-r--r-- | kernel/include/linux/kmsg_dump.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/kernel/include/linux/kmsg_dump.h b/kernel/include/linux/kmsg_dump.h new file mode 100644 index 000000000..2e7a1e032 --- /dev/null +++ b/kernel/include/linux/kmsg_dump.h @@ -0,0 +1,117 @@ +/* + * linux/include/kmsg_dump.h + * + * Copyright (C) 2009 Net Insight AB + * + * Author: Simon Kagstrom <simon.kagstrom@netinsight.net> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ +#ifndef _LINUX_KMSG_DUMP_H +#define _LINUX_KMSG_DUMP_H + +#include <linux/errno.h> +#include <linux/list.h> + +/* + * Keep this list arranged in rough order of priority. Anything listed after + * KMSG_DUMP_OOPS will not be logged by default unless printk.always_kmsg_dump + * is passed to the kernel. + */ +enum kmsg_dump_reason { + KMSG_DUMP_UNDEF, + KMSG_DUMP_PANIC, + KMSG_DUMP_OOPS, + KMSG_DUMP_EMERG, + KMSG_DUMP_RESTART, + KMSG_DUMP_HALT, + KMSG_DUMP_POWEROFF, +}; + +/** + * struct kmsg_dumper - kernel crash message dumper structure + * @list: Entry in the dumper list (private) + * @dump: Call into dumping code which will retrieve the data with + * through the record iterator + * @max_reason: filter for highest reason number that should be dumped + * @registered: Flag that specifies if this is already registered + */ +struct kmsg_dumper { + struct list_head list; + void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason); + enum kmsg_dump_reason max_reason; + bool active; + bool registered; + + /* private state of the kmsg iterator */ + u32 cur_idx; + u32 next_idx; + u64 cur_seq; + u64 next_seq; +}; + +#ifdef CONFIG_PRINTK +void kmsg_dump(enum kmsg_dump_reason reason); + +bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, bool syslog, + char *line, size_t size, size_t *len); + +bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog, + char *line, size_t size, size_t *len); + +bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog, + char *buf, size_t size, size_t *len); + +void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper); + +void kmsg_dump_rewind(struct kmsg_dumper *dumper); + +int kmsg_dump_register(struct kmsg_dumper *dumper); + +int kmsg_dump_unregister(struct kmsg_dumper *dumper); +#else +static inline void kmsg_dump(enum kmsg_dump_reason reason) +{ +} + +static inline bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, + bool syslog, const char *line, + size_t size, size_t *len) +{ + return false; +} + +static inline bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog, + const char *line, size_t size, size_t *len) +{ + return false; +} + +static inline bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog, + char *buf, size_t size, size_t *len) +{ + return false; +} + +static inline void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper) +{ +} + +static inline void kmsg_dump_rewind(struct kmsg_dumper *dumper) +{ +} + +static inline int kmsg_dump_register(struct kmsg_dumper *dumper) +{ + return -EINVAL; +} + +static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper) +{ + return -EINVAL; +} +#endif + +#endif /* _LINUX_KMSG_DUMP_H */ |