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e1a261ba59
kmsg_dump doesn't forward the panic reason string to the kmsg_dumper callback. This patch adds a new struct kmsg_dump_detail, that will hold the reason and description, and pass it to the dump() callback. To avoid updating all kmsg_dump() call, it adds a kmsg_dump_desc() function and a macro for backward compatibility. I've written this for drm_panic, but it can be useful for other kmsg_dumper. It allows to see the panic reason, like "sysrq triggered crash" or "VFS: Unable to mount root fs on xxxx" on the drm panic screen. v2: * Use a struct kmsg_dump_detail to hold the reason and description pointer, for more flexibility if we want to add other parameters. (Kees Cook) * Fix powerpc/nvram_64 build, as I didn't update the forward declaration of oops_to_nvram() Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com> Acked-by: Petr Mladek <pmladek@suse.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Acked-by: Kees Cook <kees@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20240702122639.248110-1-jfalempe@redhat.com
127 lines
3.1 KiB
C
127 lines
3.1 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_SHUTDOWN,
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KMSG_DUMP_MAX
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};
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/**
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* struct kmsg_dump_iter - iterator for retrieving kernel messages
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* @cur_seq: Points to the oldest message to dump
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* @next_seq: Points after the newest message to dump
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*/
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struct kmsg_dump_iter {
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u64 cur_seq;
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u64 next_seq;
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};
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/**
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* struct kmsg_dump_detail - kernel crash detail
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* @reason: reason for the crash, see kmsg_dump_reason.
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* @description: optional short string, to provide additional information.
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*/
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struct kmsg_dump_detail {
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enum kmsg_dump_reason reason;
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const char *description;
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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, struct kmsg_dump_detail *detail);
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enum kmsg_dump_reason max_reason;
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bool registered;
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};
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#ifdef CONFIG_PRINTK
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void kmsg_dump_desc(enum kmsg_dump_reason reason, const char *desc);
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bool kmsg_dump_get_line(struct kmsg_dump_iter *iter, 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_dump_iter *iter, bool syslog,
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char *buf, size_t size, size_t *len_out);
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void kmsg_dump_rewind(struct kmsg_dump_iter *iter);
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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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const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason);
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#else
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static inline void kmsg_dump_desc(enum kmsg_dump_reason reason, const char *desc)
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{
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}
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static inline bool kmsg_dump_get_line(struct kmsg_dump_iter *iter, 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_dump_iter *iter, 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(struct kmsg_dump_iter *iter)
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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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static inline const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason)
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{
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return "Disabled";
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}
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#endif
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static inline void kmsg_dump(enum kmsg_dump_reason reason)
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{
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kmsg_dump_desc(reason, NULL);
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}
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#endif /* _LINUX_KMSG_DUMP_H */
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