[PATCH 2/2] gsmi: Log event for critical thermal thresholds

From: Ross Zwisler
Date: Mon Oct 22 2018 - 16:32:30 EST


From: Duncan Laurie <dlaurie@xxxxxxxxxxxx>

This registers a notifier for the new thermal notifier
introduced in a previous commit and logs a kernel shutdown
event when the notifier is called for crossing the
THERMAL_TRIP_CRITICAL threshold.

To test:
1) Modify critical shutdown threshold in the BIOS
2) Generate a load on the system to increase temperature
3) Wait until system powers off
4) Power back on and read the event log:

4 | 2012-07-18 10:47:02 | Kernel Event | Critical Thermal Threshold
5 | 2012-07-18 10:47:06 | Kernel Event | Clean Shutdown
6 | 2012-07-18 10:47:06 | ACPI Enter | S5

Signed-off-by: Duncan Laurie <dlaurie@xxxxxxxxxxxx>
Reviewed-by: Vincent Palatin <vpalatin@xxxxxxxxxxxx>
Reviewed-by: Olof Johansson <olofj@xxxxxxxxxxxx>
[ rez: updated changelog for upstream ]
Signed-off-by: Ross Zwisler <zwisler@xxxxxxxxxx>
---
drivers/firmware/google/gsmi.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c
index c8f169bf2e27d..ee0c611b83e99 100644
--- a/drivers/firmware/google/gsmi.c
+++ b/drivers/firmware/google/gsmi.c
@@ -29,6 +29,7 @@
#include <linux/efi.h>
#include <linux/module.h>
#include <linux/ucs2_string.h>
+#include <linux/thermal.h>

#define GSMI_SHUTDOWN_CLEAN 0 /* Clean Shutdown */
/* TODO(mikew@xxxxxxxxxx): Tie in HARDLOCKUP_DETECTOR with NMIWDT */
@@ -40,6 +41,7 @@
#define GSMI_SHUTDOWN_SOFTWDT 6 /* Software Watchdog */
#define GSMI_SHUTDOWN_MBE 7 /* Uncorrected ECC */
#define GSMI_SHUTDOWN_TRIPLE 8 /* Triple Fault */
+#define GSMI_SHUTDOWN_THERMAL 9 /* Critical Thermal Threshold */

#define DRIVER_VERSION "1.0"
#define GSMI_GUID_SIZE 16
@@ -670,6 +672,18 @@ static struct notifier_block gsmi_panic_notifier = {
.notifier_call = gsmi_panic_callback,
};

+static int gsmi_thermal_callback(struct notifier_block *nb,
+ unsigned long reason, void *arg)
+{
+ if (reason == THERMAL_TRIP_CRITICAL)
+ gsmi_shutdown_reason(GSMI_SHUTDOWN_THERMAL);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block gsmi_thermal_notifier = {
+ .notifier_call = gsmi_thermal_callback
+};
+
/*
* This hash function was blatantly copied from include/linux/hash.h.
* It is used by this driver to obfuscate a board name that requires a
@@ -892,6 +906,7 @@ static __init int gsmi_init(void)
goto out_remove_sysfs_files;
}

+ register_thermal_notifier(&gsmi_thermal_notifier);
register_reboot_notifier(&gsmi_reboot_notifier);
register_die_notifier(&gsmi_die_notifier);
atomic_notifier_chain_register(&panic_notifier_list,
@@ -918,6 +933,7 @@ static __init int gsmi_init(void)

static void __exit gsmi_exit(void)
{
+ unregister_thermal_notifier(&gsmi_thermal_notifier);
unregister_reboot_notifier(&gsmi_reboot_notifier);
unregister_die_notifier(&gsmi_die_notifier);
atomic_notifier_chain_unregister(&panic_notifier_list,
--
2.19.1.568.g152ad8e336-goog