cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kmsg_dump.h (2772B)

      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 */
     23enum kmsg_dump_reason {
     24	KMSG_DUMP_UNDEF,
     25	KMSG_DUMP_PANIC,
     26	KMSG_DUMP_OOPS,
     27	KMSG_DUMP_EMERG,
     28	KMSG_DUMP_SHUTDOWN,
     29	KMSG_DUMP_MAX
     30};
     31
     32/**
     33 * struct kmsg_dump_iter - iterator for retrieving kernel messages
     34 * @cur_seq:	Points to the oldest message to dump
     35 * @next_seq:	Points after the newest message to dump
     36 */
     37struct kmsg_dump_iter {
     38	u64	cur_seq;
     39	u64	next_seq;
     40};
     41
     42/**
     43 * struct kmsg_dumper - kernel crash message dumper structure
     44 * @list:	Entry in the dumper list (private)
     45 * @dump:	Call into dumping code which will retrieve the data with
     46 * 		through the record iterator
     47 * @max_reason:	filter for highest reason number that should be dumped
     48 * @registered:	Flag that specifies if this is already registered
     49 */
     50struct kmsg_dumper {
     51	struct list_head list;
     52	void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
     53	enum kmsg_dump_reason max_reason;
     54	bool registered;
     55};
     56
     57#ifdef CONFIG_PRINTK
     58void kmsg_dump(enum kmsg_dump_reason reason);
     59
     60bool kmsg_dump_get_line(struct kmsg_dump_iter *iter, bool syslog,
     61			char *line, size_t size, size_t *len);
     62
     63bool kmsg_dump_get_buffer(struct kmsg_dump_iter *iter, bool syslog,
     64			  char *buf, size_t size, size_t *len_out);
     65
     66void kmsg_dump_rewind(struct kmsg_dump_iter *iter);
     67
     68int kmsg_dump_register(struct kmsg_dumper *dumper);
     69
     70int kmsg_dump_unregister(struct kmsg_dumper *dumper);
     71
     72const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason);
     73#else
     74static inline void kmsg_dump(enum kmsg_dump_reason reason)
     75{
     76}
     77
     78static inline bool kmsg_dump_get_line(struct kmsg_dump_iter *iter, bool syslog,
     79				const char *line, size_t size, size_t *len)
     80{
     81	return false;
     82}
     83
     84static inline bool kmsg_dump_get_buffer(struct kmsg_dump_iter *iter, bool syslog,
     85					char *buf, size_t size, size_t *len)
     86{
     87	return false;
     88}
     89
     90static inline void kmsg_dump_rewind(struct kmsg_dump_iter *iter)
     91{
     92}
     93
     94static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
     95{
     96	return -EINVAL;
     97}
     98
     99static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
    100{
    101	return -EINVAL;
    102}
    103
    104static inline const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason)
    105{
    106	return "Disabled";
    107}
    108#endif
    109
    110#endif /* _LINUX_KMSG_DUMP_H */