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[PATCHv2 0/3] thermal: rework core to improve userspace interaction

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  [PATCHv2 0/3] thermal: rework core to improve userspace interaction  Eduardo Valentin <edubezval@gmail.com> - 2015-12-17 20:20 +0100
    [PATCHv2 3/3] thermal: improve hot trip handling Eduardo Valentin <edubezval@gmail.com> - 2015-12-17 20:20 +0100

#1294154 — [PATCHv2 0/3] thermal: rework core to improve userspace interaction

Hello Rui, linux-pm

Changelog:
V1 -> V2: Fixes patch 2, and added Srivinas reviewed by on patch 1.

Please consider these three patches in the thermal core to improve
the interaction with userspace.

The first is already in its second version. It avoids reconfiguring
monitor period. Now the thermal core configures the monitor only
after handling all trip points.

The second is about improving emul_temp. The background here is to
allow using emul_temp, even if the thermal zone is not fully setup,
with a missing .get_temp().

The third is to improve hot trip points handling. Hot trip points
are described as notification entry points. However, we do very
little on them. This patch adds a uevent to propagate the event
to userspace. Today, we rely on thermal zone driver. I believe
having the same message coming on every thermal zone makes more
sense. However, I did not remove the .notify() callback, and it
should behave the same.

Eduardo Valentin (3):
  thermal: setup monitor only once after handling trips
  thermal: rework core to allow emul_temp to be treated as regular temp
  thermal: improve hot trip handling

 drivers/thermal/thermal_core.c | 96 ++++++++++++++++++++++++++++++++++--------
 1 file changed, 78 insertions(+), 18 deletions(-)

-- 
2.5.0

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#1294156 — [PATCHv2 3/3] thermal: improve hot trip handling

The idea is to add the choice to be notified only when temperature
crosses trip points. The trip points affected are the non-passive
trip points.

It will check last temperature and current temperature against
the trip point temperature and its hysteresis.
In case the check shows temperature has changed enought indicating
a trip point crossing, a uevent will be sent to userspace.

The uevent contains the thermal zone type, the current temperature,
the last temperature and the trip point in which the current temperature
now resides.

The behavior of ops->notify() callback remains the same.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
---
V1->V2: none
---
 drivers/thermal/thermal_core.c | 52 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index a229c84..e0f1f4e 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -423,6 +423,56 @@ static void handle_non_critical_trips(struct thermal_zone_device *tz,
 		       def_governor->throttle(tz, trip);
 }
 
+static void thermal_tripped_notify(struct thermal_zone_device *tz,
+				   int trip, enum thermal_trip_type trip_type,
+				   int trip_temp)
+{
+	char tuv_name[THERMAL_NAME_LENGTH + 15], tuv_temp[25],
+		tuv_ltemp[25], tuv_trip[25], tuv_type[25];
+	char *msg[6] = { tuv_name, tuv_temp, tuv_ltemp, tuv_trip, tuv_type,
+			NULL };
+	int upper_trip_hyst, upper_trip_temp, trip_hyst = 0;
+	int ret = 0;
+
+	snprintf(tuv_name, sizeof(tuv_name), "THERMAL_ZONE=%s", tz->type);
+	snprintf(tuv_temp, sizeof(tuv_temp), "TEMP=%d", tz->temperature);
+	snprintf(tuv_ltemp, sizeof(tuv_ltemp), "LAST_TEMP=%d",
+		 tz->last_temperature);
+	snprintf(tuv_trip, sizeof(tuv_trip), "TRIP=%d", trip);
+	snprintf(tuv_type, sizeof(tuv_type), "TRIP_TYPE=%d", trip_type);
+
+	mutex_lock(&tz->lock);
+
+	/* crossing up */
+	if (tz->last_temperature < trip_temp && trip_temp < tz->temperature)
+		kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, msg);
+
+	if (tz->ops->get_trip_hyst)
+		tz->ops->get_trip_hyst(tz, trip, &trip_hyst);
+
+	/* crossing down, check for hyst */
+	trip_temp -= trip_hyst;
+	if (tz->last_temperature > trip_temp && trip_temp > tz->temperature) {
+		snprintf(tuv_trip, sizeof(tuv_trip), "TRIP=%d", trip - 1);
+		kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, msg);
+	}
+
+	ret = tz->ops->get_trip_temp(tz, trip + 1, &upper_trip_temp);
+	if (ret)
+		goto unlock;
+
+	if (tz->ops->get_trip_hyst)
+		tz->ops->get_trip_hyst(tz, trip + 1, &upper_trip_hyst);
+
+	upper_trip_temp -= upper_trip_hyst;
+	if (tz->last_temperature > upper_trip_temp &&
+	    upper_trip_temp > tz->temperature)
+		kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, msg);
+
+unlock:
+	mutex_unlock(&tz->lock);
+}
+
 static void handle_critical_trips(struct thermal_zone_device *tz,
 				int trip, enum thermal_trip_type trip_type)
 {
@@ -430,6 +480,8 @@ static void handle_critical_trips(struct thermal_zone_device *tz,
 
 	tz->ops->get_trip_temp(tz, trip, &trip_temp);
 
+	thermal_tripped_notify(tz, trip, trip_type, trip_temp);
+
 	/* If we have not crossed the trip_temp, we do not care. */
 	if (trip_temp <= 0 || tz->temperature < trip_temp)
 		return;
-- 
2.5.0

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