thermal/drivers/netlink: Add the temperature when crossing a trip point

The slope of the temperature increase or decrease can be high and when
the temperature crosses the trip point, there could be a significant
difference between the trip temperature and the measured temperatures.

That forces the userspace to read the temperature back right after
receiving a trip violation notification.

In order to be efficient, give the temperature which resulted in the
trip violation.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20211001223323.1836640-1-daniel.lezcano@linaro.org

drivers/thermal/thermal_core.c

@@ -375,10 +375,12 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 	if (tz->last_temperature != THERMAL_TEMP_INVALID) {
 		if (tz->last_temperature < trip_temp &&
 		    tz->temperature >= trip_temp)
-			thermal_notify_tz_trip_up(tz->id, trip);
+			thermal_notify_tz_trip_up(tz->id, trip,
+						  tz->temperature);
 		if (tz->last_temperature >= trip_temp &&
 		    tz->temperature < (trip_temp - hyst))
-			thermal_notify_tz_trip_down(tz->id, trip);
+			thermal_notify_tz_trip_down(tz->id, trip,
+						    tz->temperature);
 	}
 
 	if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)

drivers/thermal/thermal_netlink.c

@@ -121,7 +121,8 @@ static int thermal_genl_event_tz(struct param *p)
 static int thermal_genl_event_tz_trip_up(struct param *p)
 {
 	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
-	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, p->trip_id))
+	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, p->trip_id) ||
+	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TEMP, p->temp))
 		return -EMSGSIZE;
 
 	return 0;
@@ -285,16 +286,16 @@ int thermal_notify_tz_disable(int tz_id)
 	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_DISABLE, &p);
 }
 
-int thermal_notify_tz_trip_down(int tz_id, int trip_id)
+int thermal_notify_tz_trip_down(int tz_id, int trip_id, int temp)
 {
-	struct param p = { .tz_id = tz_id, .trip_id = trip_id };
+	struct param p = { .tz_id = tz_id, .trip_id = trip_id, .temp = temp };
 
 	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_DOWN, &p);
 }
 
-int thermal_notify_tz_trip_up(int tz_id, int trip_id)
+int thermal_notify_tz_trip_up(int tz_id, int trip_id, int temp)
 {
-	struct param p = { .tz_id = tz_id, .trip_id = trip_id };
+	struct param p = { .tz_id = tz_id, .trip_id = trip_id, .temp = temp };
 
 	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_UP, &p);
 }

drivers/thermal/thermal_netlink.h

@@ -11,8 +11,8 @@ int thermal_notify_tz_create(int tz_id, const char *name);
 int thermal_notify_tz_delete(int tz_id);
 int thermal_notify_tz_enable(int tz_id);
 int thermal_notify_tz_disable(int tz_id);
-int thermal_notify_tz_trip_down(int tz_id, int id);
-int thermal_notify_tz_trip_up(int tz_id, int id);
+int thermal_notify_tz_trip_down(int tz_id, int id, int temp);
+int thermal_notify_tz_trip_up(int tz_id, int id, int temp);
 int thermal_notify_tz_trip_delete(int tz_id, int id);
 int thermal_notify_tz_trip_add(int tz_id, int id, int type,
 			       int temp, int hyst);
@@ -49,12 +49,12 @@ static inline int thermal_notify_tz_disable(int tz_id)
 	return 0;
 }
 
-static inline int thermal_notify_tz_trip_down(int tz_id, int id)
+static inline int thermal_notify_tz_trip_down(int tz_id, int id, int temp)
 {
 	return 0;
 }
 
-static inline int thermal_notify_tz_trip_up(int tz_id, int id)
+static inline int thermal_notify_tz_trip_up(int tz_id, int id, int temp)
 {
 	return 0;
 }