blob: 427dd5a61a38a18595be9089ecbd53eed1e185b6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/kmsg_dump.h>
#include <linux/spinlock.h>
#include <linux/console.h>
#include <linux/string.h>
#include <shared/init.h>
#include <shared/kern.h>
#include <os.h>
static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason)
{
static struct kmsg_dump_iter iter;
static DEFINE_SPINLOCK(lock);
static char line[1024];
struct console *con;
unsigned long flags;
size_t len = 0;
int cookie;
/*
* If no consoles are available to output crash information, dump
* the kmsg buffer to stdout.
*/
cookie = console_srcu_read_lock();
for_each_console_srcu(con) {
/*
* The ttynull console and disabled consoles are ignored
* since they cannot output. All other consoles are
* expected to output the crash information.
*/
if (strcmp(con->name, "ttynull") != 0 &&
(console_srcu_read_flags(con) & CON_ENABLED)) {
break;
}
}
console_srcu_read_unlock(cookie);
if (con)
return;
if (!spin_trylock_irqsave(&lock, flags))
return;
kmsg_dump_rewind(&iter);
printf("kmsg_dump:\n");
while (kmsg_dump_get_line(&iter, true, line, sizeof(line), &len)) {
line[len] = '\0';
printf("%s", line);
}
spin_unlock_irqrestore(&lock, flags);
}
static struct kmsg_dumper kmsg_dumper = {
.dump = kmsg_dumper_stdout
};
int __init kmsg_dumper_stdout_init(void)
{
return kmsg_dump_register(&kmsg_dumper);
}
__uml_postsetup(kmsg_dumper_stdout_init);
|
