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PM: dpm_watchdog: add module param to backtrace all CPUs 

Add dpm_watchdog_all_cpu_backtrace module parameter which
controls all CPU backtrace dump before the DPM watchdog panics
the system.

This is expected to help understand what might have caused device
timeout.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Link: https://patch.msgid.link/20251007063551.3147937-1-senozhatsky@chromium.org
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sergey Senozhatsky 2025-10-07 15:35:40 +09:00 committed by Rafael J. Wysocki
parent 5a151c2328
commit a67818f745
1 changed files with 10 additions and 0 deletions
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10
drivers/base/power/main.c
View File

@ -34,6 +34,7 @@
#include <linux/cpufreq.h>
#include <linux/devfreq.h>
#include <linux/timer.h>
#include <linux/nmi.h>
#include "../base.h"
#include "power.h"
@ -515,6 +516,11 @@ struct dpm_watchdog {
#define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \
struct dpm_watchdog wd
static bool __read_mostly dpm_watchdog_all_cpu_backtrace;
module_param(dpm_watchdog_all_cpu_backtrace, bool, 0644);
MODULE_PARM_DESC(dpm_watchdog_all_cpu_backtrace,
"Backtrace all CPUs on DPM watchdog timeout");
/**
* dpm_watchdog_handler - Driver suspend / resume watchdog handler.
* @t: The timer that PM watchdog depends on.
@ -530,8 +536,12 @@ static void dpm_watchdog_handler(struct timer_list *t)
unsigned int time_left;
if (wd->fatal) {
unsigned int this_cpu = smp_processor_id();
dev_emerg(wd->dev, "**** DPM device timeout ****\n");
show_stack(wd->tsk, NULL, KERN_EMERG);
if (dpm_watchdog_all_cpu_backtrace)
trigger_allbutcpu_cpu_backtrace(this_cpu);
panic("%s %s: unrecoverable failure\n",
dev_driver_string(wd->dev), dev_name(wd->dev));
}