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From:   Lukasz Luba <lukasz.luba@arm.com>
To:     linux-kernel@vger.kernel.org, daniel.lezcano@linaro.org,
        rafael@kernel.org
Cc:     linux-pm@vger.kernel.org, rui.zhang@intel.com, lukasz.luba@arm.com
Subject: [PATCH v2 7/8] thermal/sysfs: Update governors when the 'weight' has changed
Date:   Tue, 12 Dec 2023 13:48:43 +0000
Message-Id: <20231212134844.1213381-8-lukasz.luba@arm.com>
In-Reply-To: <20231212134844.1213381-1-lukasz.luba@arm.com>
References: <20231212134844.1213381-1-lukasz.luba@arm.com>
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Support governors update when the thermal instance's weight has changed.
This allows to adjust internal state for the governor.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
 drivers/thermal/thermal_sysfs.c | 9 +++++++++
 include/linux/thermal.h         | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
index df85df7d4a88..9afa2e2b76b9 100644
--- a/drivers/thermal/thermal_sysfs.c
+++ b/drivers/thermal/thermal_sysfs.c
@@ -957,6 +957,14 @@ weight_show(struct device *dev, struct device_attribute *attr, char *buf)
 	return sprintf(buf, "%d\n", instance->weight);
 }
 
+static void handle_weight_update(struct thermal_zone_device *tz)
+{
+	if (!tz->governor || !tz->governor->update_tz)
+		return;
+
+	tz->governor->update_tz(tz, THERMAL_INSTANCE_WEIGHT_UPDATE);
+}
+
 ssize_t weight_store(struct device *dev, struct device_attribute *attr,
 		     const char *buf, size_t count)
 {
@@ -974,6 +982,7 @@ ssize_t weight_store(struct device *dev, struct device_attribute *attr,
 	/* Don't race with governors using the 'weight' value */
 	mutex_lock(&tz->lock);
 	instance->weight = weight;
+	handle_weight_update(tz);
 	mutex_unlock(&tz->lock);
 
 	return count;
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 9fd0d3fb234a..24176f075fbf 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -52,6 +52,7 @@ enum thermal_notify_event {
 	THERMAL_TABLE_CHANGED, /* Thermal table(s) changed */
 	THERMAL_EVENT_KEEP_ALIVE, /* Request for user space handler to respond */
 	THERMAL_INSTANCE_LIST_UPDATE, /* List of thermal instances changed */
+	THERMAL_INSTANCE_WEIGHT_UPDATE, /* Thermal instance weight changed */
 };
 
 /**
-- 
2.25.1