linux-kernel - [PATCH v1 05/16] thermal: core: Introduce .manage() callback for thermal governors

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Date: Wed, 10 Apr 2024 18:08:12 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Lukasz Luba <lukasz.luba@....com>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject:
 [PATCH v1 05/16] thermal: core: Introduce .manage() callback for thermal
 governors

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Introduce a new thermal governor callback called .manage() that will be
invoked once per thermal zone update after processing all of the trip
points in the core.

This will allow governors that look at multiple trip points together
to check all of them in a consistent configuration, so they don't need
to play tricks with skipping .throttle() invocations that they are not
interested in and they can avoid carrying out the same computations for
multiple times in one cycle.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/thermal_core.c |    3 +++
 drivers/thermal/thermal_core.h |    2 ++
 2 files changed, 5 insertions(+)

Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -516,6 +516,9 @@ void __thermal_zone_device_update(struct
 			governor->trip_crossed(tz, &td->trip, false);
 	}

+	if (governor->manage)
+		governor->manage(tz);
+
 	monitor_thermal_zone(tz);
 }

Index: linux-pm/drivers/thermal/thermal_core.h
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.h
+++ linux-pm/drivers/thermal/thermal_core.h
@@ -31,6 +31,7 @@ struct thermal_trip_desc {
  * @unbind_from_tz:	callback called when a governor is unbound from a
  *			thermal zone.
  * @trip_crossed:	called for trip points that have just been crossed
+ * @manage:	called on thermal zone temperature updates
  * @throttle:	callback called for every trip point even if temperature is
  *		below the trip point temperature
  * @update_tz:	callback called when thermal zone internals have changed, e.g.
@@ -44,6 +45,7 @@ struct thermal_governor {
 	void (*trip_crossed)(struct thermal_zone_device *tz,
 			     const struct thermal_trip *trip,
 			     bool crossed_up);
+	void (*manage)(struct thermal_zone_device *tz);
 	int (*throttle)(struct thermal_zone_device *tz,
 			const struct thermal_trip *trip);
 	void (*update_tz)(struct thermal_zone_device *tz,