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debug: add watchdog trigger in sysrq

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PD#165796: watchdog trigger to debug wdt related behavior
"echo x > /proc/sysrq-trigger" to trigger watchdog

Change-Id: Iddd92cd64c9a7ccdf452f23706b396eaf50ae448
Signed-off-by: jianxin.pan <jianxin.pan@amlogic.com>
This commit is contained in:
jianxin.pan
2018-05-07 14:25:48 +08:00
committed by Yixun Lan
parent 91d7a0007a
commit 5aa2357ea0
1 changed files with 23 additions and 1 deletions
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24
drivers/tty/sysrq.c
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@@ -150,6 +150,26 @@ static struct sysrq_key_op sysrq_crash_op = {
.enable_mask = SYSRQ_ENABLE_DUMP,
};
#ifdef CONFIG_AMLOGIC_MODIFY
static DEFINE_SPINLOCK(wdt_lock);
static void sysrq_handle_wdt_sw_rst(int key)
{
unsigned long flags;
spin_lock_irqsave(&wdt_lock, flags);
while (1)
;
/* wait for wdt fiq to kick in. */
}
static struct sysrq_key_op sysrq_wdt_sw_op = {
.handler = sysrq_handle_wdt_sw_rst,
.help_msg = "dis intr to riggger wdt rst(x)",
.action_msg = "Trigger a sw wdt reset",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
#endif
static void sysrq_handle_reboot(int key)
{
lockdep_off();
@@ -484,7 +504,9 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
/* x: May be registered on mips for TLB dump */
/* x: May be registered on ppc/powerpc for xmon */
/* x: May be registered on sparc64 for global PMU dump */
NULL, /* x */
#ifdef CONFIG_AMLOGIC_MODIFY
&sysrq_wdt_sw_op, /* x */
#endif
/* y: May be registered on sparc64 for global register dump */
NULL, /* y */
&sysrq_ftrace_dump_op, /* z */