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