linux-kernel - [PATCH v1 06/16] thermal: gov_power_allocator: Use .manage() callback instead of .throttle()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Wed, 10 Apr 2024 18:10:14 +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 06/16] thermal: gov_power_allocator: Use .manage() callback instead
 of .throttle()

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

The Power Allocator governor really only wants to be called once per
thermal zone update and it does a special check to skip the extra,
from its perspective, invocations of the .throttle() callback.

Make it use .manage() instead of .throttle().

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/gov_power_allocator.c |   24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

Index: linux-pm/drivers/thermal/gov_power_allocator.c
===================================================================
--- linux-pm.orig/drivers/thermal/gov_power_allocator.c
+++ linux-pm/drivers/thermal/gov_power_allocator.c
@@ -395,7 +395,7 @@ static void divvy_up_power(struct power_
 	}
 }
 
-static int allocate_power(struct thermal_zone_device *tz, int control_temp)
+static void allocate_power(struct thermal_zone_device *tz, int control_temp)
 {
 	struct power_allocator_params *params = tz->governor_data;
 	unsigned int num_actors = params->num_actors;
@@ -410,7 +410,7 @@ static int allocate_power(struct thermal
 	int i = 0, ret;
 
 	if (!num_actors)
-		return -ENODEV;
+		return;
 
 	/* Clean all buffers for new power estimations */
 	memset(power, 0, params->buffer_size);
@@ -471,8 +471,6 @@ static int allocate_power(struct thermal
 				      num_actors, power_range,
 				      max_allocatable_power, tz->temperature,
 				      control_temp - tz->temperature);
-
-	return 0;
 }
 
 /**
@@ -745,40 +743,32 @@ static void power_allocator_unbind(struc
 	tz->governor_data = NULL;
 }
 
-static int power_allocator_throttle(struct thermal_zone_device *tz,
-				    const struct thermal_trip *trip)
+static void power_allocator_manage(struct thermal_zone_device *tz)
 {
 	struct power_allocator_params *params = tz->governor_data;
+	const struct thermal_trip *trip = params->trip_switch_on;
 	bool update;
 
 	lockdep_assert_held(&tz->lock);
 
-	/*
-	 * We get called for every trip point but we only need to do
-	 * our calculations once
-	 */
-	if (trip != params->trip_max)
-		return 0;
-
-	trip = params->trip_switch_on;
 	if (trip && tz->temperature < trip->temperature) {
 		update = tz->passive;
 		tz->passive = 0;
 		reset_pid_controller(params);
 		allow_maximum_power(tz, update);
-		return 0;
+		return;
 	}
 
 	tz->passive = 1;
 
-	return allocate_power(tz, params->trip_max->temperature);
+	allocate_power(tz, params->trip_max->temperature);
 }
 
 static struct thermal_governor thermal_gov_power_allocator = {
 	.name		= "power_allocator",
 	.bind_to_tz	= power_allocator_bind,
 	.unbind_from_tz	= power_allocator_unbind,
-	.throttle	= power_allocator_throttle,
+	.manage		= power_allocator_manage,
 	.update_tz	= power_allocator_update_tz,
 };
 THERMAL_GOVERNOR_DECLARE(thermal_gov_power_allocator);