533827c921
If used from KDB, the locked variants are prone to deadlocks (suppose we got to the debugger w/ the logbuf lock held). So, we have to implement a few routines that grab no logbuf lock. Yet we don't need these functions in modules, so we don't export them. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
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* linux/include/kmsg_dump.h
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*
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* Copyright (C) 2009 Net Insight AB
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*
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* Author: Simon Kagstrom <simon.kagstrom@netinsight.net>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#ifndef _LINUX_KMSG_DUMP_H
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#define _LINUX_KMSG_DUMP_H
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#include <linux/errno.h>
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#include <linux/list.h>
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/*
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* Keep this list arranged in rough order of priority. Anything listed after
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* KMSG_DUMP_OOPS will not be logged by default unless printk.always_kmsg_dump
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* is passed to the kernel.
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*/
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enum kmsg_dump_reason {
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KMSG_DUMP_UNDEF,
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KMSG_DUMP_PANIC,
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KMSG_DUMP_OOPS,
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KMSG_DUMP_EMERG,
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KMSG_DUMP_RESTART,
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KMSG_DUMP_HALT,
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KMSG_DUMP_POWEROFF,
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};
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/**
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* struct kmsg_dumper - kernel crash message dumper structure
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* @list: Entry in the dumper list (private)
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* @dump: Call into dumping code which will retrieve the data with
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* through the record iterator
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* @max_reason: filter for highest reason number that should be dumped
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* @registered: Flag that specifies if this is already registered
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*/
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struct kmsg_dumper {
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struct list_head list;
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void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
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enum kmsg_dump_reason max_reason;
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bool active;
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bool registered;
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/* private state of the kmsg iterator */
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u32 cur_idx;
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u32 next_idx;
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u64 cur_seq;
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u64 next_seq;
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};
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#ifdef CONFIG_PRINTK
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void kmsg_dump(enum kmsg_dump_reason reason);
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bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, bool syslog,
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char *line, size_t size, size_t *len);
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bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
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char *line, size_t size, size_t *len);
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bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
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char *buf, size_t size, size_t *len);
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void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper);
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void kmsg_dump_rewind(struct kmsg_dumper *dumper);
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int kmsg_dump_register(struct kmsg_dumper *dumper);
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int kmsg_dump_unregister(struct kmsg_dumper *dumper);
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#else
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static inline void kmsg_dump(enum kmsg_dump_reason reason)
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{
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}
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static inline bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper,
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bool syslog, const char *line,
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size_t size, size_t *len)
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{
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return false;
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}
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static inline bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
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const char *line, size_t size, size_t *len)
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{
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return false;
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}
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static inline bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
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char *buf, size_t size, size_t *len)
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{
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return false;
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}
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static inline void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper)
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{
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}
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static inline void kmsg_dump_rewind(struct kmsg_dumper *dumper)
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{
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}
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static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
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{
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return -EINVAL;
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}
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static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
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{
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return -EINVAL;
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}
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#endif
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#endif /* _LINUX_KMSG_DUMP_H */
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