From nobody Fri Dec 19 00:21:13 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7549EC4167B for ; Fri, 1 Dec 2023 21:08:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379659AbjLAVId (ORCPT ); Fri, 1 Dec 2023 16:08:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50270 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379643AbjLAVIa (ORCPT ); Fri, 1 Dec 2023 16:08:30 -0500 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DDEDD10DA; Fri, 1 Dec 2023 13:08:34 -0800 (PST) Received: from localhost (127.0.0.1) (HELO v370.home.net.pl) by /usr/run/smtp (/usr/run/postfix/private/idea_relay_lmtp) via UNIX with SMTP (IdeaSmtpServer 5.4.0) id 4a30dc77d0f6a91a; Fri, 1 Dec 2023 22:08:32 +0100 Received: from kreacher.localnet (unknown [195.136.19.94]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by cloudserver094114.home.pl (Postfix) with ESMTPSA id DAA7B6686C5; Fri, 1 Dec 2023 22:08:31 +0100 (CET) From: "Rafael J. Wysocki" To: Daniel Lezcano , Lukasz Luba Cc: Linux PM , LKML , Srinivas Pandruvada , Zhang Rui Subject: [PATCH v2 0/2] thermal: sysfs: Rework the handling of trip point updates Date: Fri, 01 Dec 2023 22:06:53 +0100 Message-ID: <6021522.lOV4Wx5bFT@kreacher> In-Reply-To: <12359903.O9o76ZdvQC@kreacher> References: <12359903.O9o76ZdvQC@kreacher> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvkedrudeiledgudeghecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfjqffogffrnfdpggftiffpkfenuceurghilhhouhhtmecuudehtdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvvefufffkjghfggfgtgesthfuredttddtjeenucfhrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqeenucggtffrrghtthgvrhhnpedvffeuiedtgfdvtddugeeujedtffetteegfeekffdvfedttddtuefhgeefvdejhfenucfkphepudelhedrudefiedrudelrdelgeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeduleehrddufeeirdduledrleegpdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqpdhnsggprhgtphhtthhopeeipdhrtghpthhtohepuggrnhhivghlrdhlvgiitggrnhhosehlihhnrghrohdrohhrghdprhgtphhtthhopehluhhkrghsiidrlhhusggrsegrrhhmrdgtohhmpdhrtghpthhtoheplhhinhhugidqphhmsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtohepshhr ihhnihhvrghsrdhprghnughruhhvrggurgeslhhinhhugidrihhnthgvlhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=6 Fuz1=6 Fuz2=6 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Rafael J. Wysocki Both trip_point_temp_store() and trip_point_hyst_store() use thermal_zone_set_trip() to update a given trip point, but none of them actually needs to change more than one field in struct thermal_trip representing it. However, each of them effectively calls __thermal_zone_get_trip() twice in a row for the same trip index value, once directly and once via thermal_zone_set_trip(), which is not particularly efficient, and the way in which thermal_zone_set_trip() carries out the update is not particularly straightforward. Moreover, input processing need not be done under the thermal zone lock in any of these functions. Rework trip_point_temp_store() and trip_point_hyst_store() to address the above, move the part of thermal_zone_set_trip() that is still useful to a new function called thermal_zone_trip_updated() and drop the rest of it. While at it, make trip_point_hyst_store() reject negative hysteresis values. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.h | 2 + drivers/thermal/thermal_sysfs.c | 75 ++++++++++++++++++++++++++++-------= ----- drivers/thermal/thermal_trip.c | 45 ++++-------------------- include/linux/thermal.h | 4 -- 4 files changed, 64 insertions(+), 62 deletions(-) Index: linux-pm/drivers/thermal/thermal_sysfs.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- linux-pm.orig/drivers/thermal/thermal_sysfs.c +++ linux-pm/drivers/thermal/thermal_sysfs.c @@ -78,6 +78,19 @@ mode_store(struct device *dev, struct de return count; } =20 +static int check_thermal_zone_and_trip_id(struct device *dev, + struct thermal_zone_device *tz, + int trip_id) +{ + if (!device_is_registered(dev)) + return -ENODEV; + + if (trip_id < 0 || trip_id >=3D tz->num_trips) + return -EINVAL; + + return 0; +} + static ssize_t trip_point_type_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -120,28 +133,37 @@ trip_point_temp_store(struct device *dev const char *buf, size_t count) { struct thermal_zone_device *tz =3D to_thermal_zone(dev); - struct thermal_trip trip; + struct thermal_trip *trip; int trip_id, ret; + int temp; + + ret =3D kstrtoint(buf, 10, &temp); + if (ret) + return -EINVAL; =20 if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) !=3D 1) return -EINVAL; =20 mutex_lock(&tz->lock); =20 - if (!device_is_registered(dev)) { - ret =3D -ENODEV; - goto unlock; - } - - ret =3D __thermal_zone_get_trip(tz, trip_id, &trip); + ret =3D check_thermal_zone_and_trip_id(dev, tz, trip_id); if (ret) goto unlock; =20 - ret =3D kstrtoint(buf, 10, &trip.temperature); - if (ret) - goto unlock; + trip =3D &tz->trips[trip_id]; + + if (temp !=3D trip->temperature) { + if (tz->ops->set_trip_temp) { + ret =3D tz->ops->set_trip_temp(tz, trip_id, temp); + if (ret) + goto unlock; + } + + trip->temperature =3D temp; + + thermal_zone_trip_updated(tz, trip); + } =20 - ret =3D thermal_zone_set_trip(tz, trip_id, &trip); unlock: mutex_unlock(&tz->lock); =09 @@ -179,28 +201,37 @@ trip_point_hyst_store(struct device *dev const char *buf, size_t count) { struct thermal_zone_device *tz =3D to_thermal_zone(dev); - struct thermal_trip trip; + struct thermal_trip *trip; int trip_id, ret; + int hyst; + + ret =3D kstrtoint(buf, 10, &hyst); + if (ret || hyst < 0) + return -EINVAL; =20 if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) !=3D 1) return -EINVAL; =20 mutex_lock(&tz->lock); =20 - if (!device_is_registered(dev)) { - ret =3D -ENODEV; - goto unlock; - } - - ret =3D __thermal_zone_get_trip(tz, trip_id, &trip); + ret =3D check_thermal_zone_and_trip_id(dev, tz, trip_id); if (ret) goto unlock; =20 - ret =3D kstrtoint(buf, 10, &trip.hysteresis); - if (ret) - goto unlock; + trip =3D &tz->trips[trip_id]; + + if (hyst !=3D trip->hysteresis) { + if (tz->ops->set_trip_hyst) { + ret =3D tz->ops->set_trip_hyst(tz, trip_id, hyst); + if (ret) + goto unlock; + } + + trip->hysteresis =3D hyst; + + thermal_zone_trip_updated(tz, trip); + } =20 - ret =3D thermal_zone_set_trip(tz, trip_id, &trip); unlock: mutex_unlock(&tz->lock); =20 Index: linux-pm/drivers/thermal/thermal_core.h =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- linux-pm.orig/drivers/thermal/thermal_core.h +++ linux-pm/drivers/thermal/thermal_core.h @@ -124,6 +124,8 @@ int __thermal_zone_get_trip(struct therm struct thermal_trip *trip); int thermal_zone_trip_id(struct thermal_zone_device *tz, const struct thermal_trip *trip); +void thermal_zone_trip_updated(struct thermal_zone_device *tz, + const struct thermal_trip *trip); int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp); =20 /* sysfs I/F */ Index: linux-pm/drivers/thermal/thermal_trip.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- linux-pm.orig/drivers/thermal/thermal_trip.c +++ linux-pm/drivers/thermal/thermal_trip.c @@ -147,42 +147,6 @@ int thermal_zone_get_trip(struct thermal } EXPORT_SYMBOL_GPL(thermal_zone_get_trip); =20 -int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id, - const struct thermal_trip *trip) -{ - struct thermal_trip t; - int ret; - - ret =3D __thermal_zone_get_trip(tz, trip_id, &t); - if (ret) - return ret; - - if (t.type !=3D trip->type) - return -EINVAL; - - if (t.temperature !=3D trip->temperature && tz->ops->set_trip_temp) { - ret =3D tz->ops->set_trip_temp(tz, trip_id, trip->temperature); - if (ret) - return ret; - } - - if (t.hysteresis !=3D trip->hysteresis && tz->ops->set_trip_hyst) { - ret =3D tz->ops->set_trip_hyst(tz, trip_id, trip->hysteresis); - if (ret) - return ret; - } - - if (tz->trips && (t.temperature !=3D trip->temperature || t.hysteresis != =3D trip->hysteresis)) - tz->trips[trip_id] =3D *trip; - - thermal_notify_tz_trip_change(tz->id, trip_id, trip->type, - trip->temperature, trip->hysteresis); - - __thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED); - - return 0; -} - int thermal_zone_trip_id(struct thermal_zone_device *tz, const struct thermal_trip *trip) { @@ -192,3 +156,12 @@ int thermal_zone_trip_id(struct thermal_ */ return trip - tz->trips; } + +void thermal_zone_trip_updated(struct thermal_zone_device *tz, + const struct thermal_trip *trip) +{ + thermal_notify_tz_trip_change(tz->id, thermal_zone_trip_id(tz, trip), + trip->type, trip->temperature, + trip->hysteresis); + __thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED); +} Index: linux-pm/include/linux/thermal.h =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- linux-pm.orig/include/linux/thermal.h +++ linux-pm/include/linux/thermal.h @@ -282,10 +282,6 @@ int __thermal_zone_get_trip(struct therm struct thermal_trip *trip); int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id, struct thermal_trip *trip); - -int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id, - const struct thermal_trip *trip); - int for_each_thermal_trip(struct thermal_zone_device *tz, int (*cb)(struct thermal_trip *, void *), void *data);