linux-kernel - [PATCH] thermal/drivers/netlink: Add the temperature when crossing a trip point

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Date:   Thu, 25 Mar 2021 20:36:32 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     daniel.lezcano@...aro.org
Cc:     rkumbako@...cinc.com, Zhang Rui <rui.zhang@...el.com>,
        Amit Kucheria <amitk@...nel.org>,
        linux-pm@...r.kernel.org (open list:THERMAL),
        linux-kernel@...r.kernel.org (open list),
        linux-api@...r.kernel.org (open list:ABI/API)
Subject: [PATCH] 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@...aro.org>
---
 drivers/thermal/thermal_core.c    |  6 ++++--
 drivers/thermal/thermal_netlink.c | 11 ++++++-----
 drivers/thermal/thermal_netlink.h |  8 ++++----
 include/uapi/linux/thermal.h      |  2 +-
 4 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 996c038f83a4..948020ef51b1 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -430,10 +430,12 @@ 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)
diff --git a/drivers/thermal/thermal_netlink.c b/drivers/thermal/thermal_netlink.c
index 1234dbe95895..a16dd4d5d710 100644
--- a/drivers/thermal/thermal_netlink.c
+++ b/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);
 }
diff --git a/drivers/thermal/thermal_netlink.h b/drivers/thermal/thermal_netlink.h
index 828d1dddfa98..e554f76291f4 100644
--- a/drivers/thermal/thermal_netlink.h
+++ b/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;
 }
diff --git a/include/uapi/linux/thermal.h b/include/uapi/linux/thermal.h
index c105054cbb57..bf5d9c8ef16f 100644
--- a/include/uapi/linux/thermal.h
+++ b/include/uapi/linux/thermal.h
@@ -18,7 +18,7 @@ enum thermal_trip_type {
 
 /* Adding event notification support elements */
 #define THERMAL_GENL_FAMILY_NAME		"thermal"
-#define THERMAL_GENL_VERSION			0x01
+#define THERMAL_GENL_VERSION			0x02
 #define THERMAL_GENL_SAMPLING_GROUP_NAME	"sampling"
 #define THERMAL_GENL_EVENT_GROUP_NAME		"event"
 
-- 
2.17.1