From patchwork Sat Sep 14 10:25:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 828771 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 49C601DA5E; Sat, 14 Sep 2024 11:14:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312444; cv=none; b=HHYWL9R7dGn32p1O/dmncNteHPJj7GIN+YjVHZg3X4yr0HiTPXoeVFPKHNRUowabsDF0+vwrQ4FYikF41IrkKmUSk/5ZjDZ2UmMCFHch4NtMBdK2aRRLQVaEYhI+xCEuLdfqx3Nw1O4SyDddnUoZc2boYIK66td/7XZj1sJkZ1I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312444; c=relaxed/simple; bh=IlQgOKwKcriIkpiTmpqGXxTu1Frf5sbwkloQzYZPnSQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=E+JTBXfMLay+hm6hNQxEcnToVfex0FL2xMLY3XH2EIGhZJNJMutKfd0cjddIvWxlEa9c3F/lyfhqJihvOE0n7D+X9wLDA7boNJ8xuf63EegdRTG8+sguH3R73ZgM5idrevl0jO1e9NPUnllo09JltDZVI/tWROfXz+/KG+UesDI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=q7Z2q5zH reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="q7Z2q5zH" 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 6.2.0) id b6bb8940ca4bfd4e; Sat, 14 Sep 2024 13:14:00 +0200 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 CDD2C8532AE; Sat, 14 Sep 2024 13:13:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726312440; bh=IlQgOKwKcriIkpiTmpqGXxTu1Frf5sbwkloQzYZPnSQ=; h=From:Subject:Date; b=q7Z2q5zH9AKEBmD4ZyzfRBukAT/LzrP4Abf+oEHTz4YlYTiwqEyfM+jV8wrmIEu57 aJF873KS7jEFHuOdpOzJ2nLXcK3gM9dAM0DsFsdQAtc5ykYMcThlEmeCpL2RHgVDYK t4ZhiCFXfCyoNJqSHA2CY0/U+KFMBJIdBTVAQvEb8PfIFitqZokf9rREosM4UlJ/Tu MIEgSy64DJ511xWBFTG3lWVDhflERGuUNt83A73/ZCTVSN5cx2pam5AdkciQRO7j5R /jmaHeewqEzkerg7/UTdiPDrRFL8tfnXag7jNYnjCxQSeZ3QCiKlexwydyNFJUl+sS vSS/krDZb6l/w== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 01/20] thermal: core: Use the thermal zone guard in more cases Date: Sat, 14 Sep 2024 12:25:53 +0200 Message-ID: <4613601.LvFx2qVVIh@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepfeduudeutdeugfelffduieegiedtueefledvjeegffdttefhhffhtefhleejgfetnecuffhomhgrihhnpehkvghrnhgvlhdrohhrghenucfkphepudelhedrudefiedrudelrdelgeenucfuphgrmhfkphepudelhedrudefiedrudelrdelgeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeduleehrddufeeirdduledrleegpdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpehrjhifsehrjhifhihsohgtkhhirdhnvghtpdhnsggprhgtphhtthhopeehpdhrtghpthhtoheplhhinhhugidqphhmsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtohepuggrnhhivghlrdhlvgiitggrnhhosehlihhnrghrohdrohhrghdprhgtphhtthhopehluhhkrghsiidrlhhusggrsegrrhhmrdgtohhmpdhrtghpthhtoheprhhuihdriihhrghnghesihhnthgvlhdrtghomh X-DCC--Metrics: v370.home.net.pl 1024; Body=45 Fuz1=45 Fuz2=45 From: Rafael J. Wysocki There are a few more cases in which the thermal zone guard introduced previously can be used to help clarify the code, so do that. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- To be merged with https://lore.kernel.org/linux-pm/3241904.5fSG56mABF@rjwysocki.net/ --- drivers/thermal/thermal_debugfs.c | 25 +++++++++++++++---------- drivers/thermal/thermal_hwmon.c | 6 +----- drivers/thermal/thermal_netlink.c | 21 ++++++--------------- 3 files changed, 22 insertions(+), 30 deletions(-) Index: linux-pm/drivers/thermal/thermal_netlink.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_netlink.c +++ linux-pm/drivers/thermal/thermal_netlink.c @@ -460,7 +460,7 @@ static int thermal_genl_cmd_tz_get_trip( if (!start_trip) return -EMSGSIZE; - mutex_lock(&tz->lock); + guard(thermal_zone)(tz); for_each_trip_desc(tz, td) { const struct thermal_trip *trip = &td->trip; @@ -470,19 +470,12 @@ static int thermal_genl_cmd_tz_get_trip( nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TYPE, trip->type) || nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TEMP, trip->temperature) || nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_HYST, trip->hysteresis)) - goto out_cancel_nest; + return -EMSGSIZE; } - mutex_unlock(&tz->lock); - nla_nest_end(msg, start_trip); return 0; - -out_cancel_nest: - mutex_unlock(&tz->lock); - - return -EMSGSIZE; } static int thermal_genl_cmd_tz_get_temp(struct param *p) @@ -515,7 +508,7 @@ static int thermal_genl_cmd_tz_get_gov(s { struct sk_buff *msg = p->msg; struct thermal_zone_device *tz; - int id, ret = 0; + int id; if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID]) return -EINVAL; @@ -526,16 +519,14 @@ static int thermal_genl_cmd_tz_get_gov(s if (!tz) return -EINVAL; - mutex_lock(&tz->lock); + guard(thermal_zone)(tz); if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_ID, id) || nla_put_string(msg, THERMAL_GENL_ATTR_TZ_GOV_NAME, tz->governor->name)) - ret = -EMSGSIZE; - - mutex_unlock(&tz->lock); + return -EMSGSIZE; - return ret; + return 0; } static int __thermal_genl_cmd_cdev_get(struct thermal_cooling_device *cdev, Index: linux-pm/drivers/thermal/thermal_debugfs.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_debugfs.c +++ linux-pm/drivers/thermal/thermal_debugfs.c @@ -885,6 +885,19 @@ void thermal_debug_tz_add(struct thermal tz->debugfs = thermal_dbg; } +static struct thermal_debugfs *thermal_debug_tz_clear(struct thermal_zone_device *tz) +{ + struct thermal_debugfs *thermal_dbg; + + guard(thermal_zone)(tz); + + thermal_dbg = tz->debugfs; + if (thermal_dbg) + tz->debugfs = NULL; + + return thermal_dbg; +} + void thermal_debug_tz_remove(struct thermal_zone_device *tz) { struct thermal_debugfs *thermal_dbg; @@ -892,17 +905,9 @@ void thermal_debug_tz_remove(struct ther struct tz_debugfs *tz_dbg; int *trips_crossed; - mutex_lock(&tz->lock); - - thermal_dbg = tz->debugfs; - if (!thermal_dbg) { - mutex_unlock(&tz->lock); + thermal_dbg = thermal_debug_tz_clear(tz); + if (!thermal_dbg) return; - } - - tz->debugfs = NULL; - - mutex_unlock(&tz->lock); tz_dbg = &thermal_dbg->tz_dbg; Index: linux-pm/drivers/thermal/thermal_hwmon.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_hwmon.c +++ linux-pm/drivers/thermal/thermal_hwmon.c @@ -78,19 +78,15 @@ temp_crit_show(struct device *dev, struc int temperature; int ret; - mutex_lock(&tz->lock); + guard(thermal_zone)(tz); ret = tz->ops.get_crit_temp(tz, &temperature); - - mutex_unlock(&tz->lock); - if (ret) return ret; return sprintf(buf, "%d\n", temperature); } - static struct thermal_hwmon_device * thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz) { From patchwork Sat Sep 14 10:27:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 829172 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 81E5B7A15A; Sat, 14 Sep 2024 11:14:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312443; cv=none; b=HES8K190u0tpoTitrA+uyeRgm0K/jU89psJfvzKp4ETKiMzfXXiDsgP5BZyJt+oaIGBPhcXFu5M1uL1KL+qakud4rPohpF4E6/aYBkm1J3e7PNAaKgp8gJl2iE2aEIi6wkj+knlU9x18znqU4rl3sQMe7269bwvi7XUZBsrYix0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312443; c=relaxed/simple; bh=FdlwvppnGhrvw2CWlzVf8Z4HuHTXJ0bu2PxvguLALyo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=UQjW1SepfTw7Hg8ZageKQ/nxMZvdXl0sOhSRS/B1xa0SW5eO5jj/NHGOL4hE0f/VRtmWnrPSZ4Z7lTmzYwvVFJpJoNhwCPWLjRAfk+f+9PgVUVSzwPsWbZxje2QiQw3SaHcttKjIojKwY5OY5MsFOJ0Xhq/xd42IAd2AWPFvzqQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=ZkcvyjT8 reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="ZkcvyjT8" 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 6.2.0) id 500d8a0d6220b94c; Sat, 14 Sep 2024 13:13:59 +0200 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 0E95D8532AE; Sat, 14 Sep 2024 13:13:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726312439; bh=FdlwvppnGhrvw2CWlzVf8Z4HuHTXJ0bu2PxvguLALyo=; h=From:Subject:Date; b=ZkcvyjT8J516BckV0W81lZy0ds0iQunUyoKC4tCXGXyq21t68aCCjIIjniWhJUJ3+ 5LQJV9LWOsX6Nu5aGp6GUgE1lXavWx95OtNABBcHRCjpI666IU3MXs3mf4U/DCW3LS V4TfD5xXEh/NoOt9DVi/XUjFtvg8B3/pTt8H0mx2Ts5Stmtj0uqiG+E+WFtLJOHsTU auawDa7NLS0uI9dxGUNA5ysamFrq65vzMaOexKyScefoWlmjktKcWeh06mOwDTATfc k4JX+jfg3TiULb79nFismyUdtyICPOCfcEy6wqHKZKBuo76ibwaApCCIBBQXU+2CEI 63cz0LIpfVyiw== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 02/20] thermal: core: Rearrange PM notification code Date: Sat, 14 Sep 2024 12:27:17 +0200 Message-ID: <4940614.GXAFRqVoOG@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgepudenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=45 Fuz1=45 Fuz2=45 From: Rafael J. Wysocki Move the code run for each thermal zone by the thermal PM notify handler to separate functions and use the thermal zone guard to implement locking in them. This will help to make some subsequent changes look somewhat more straightforward, among other things. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 84 ++++++++++++++++++++--------------------- 1 file changed, 42 insertions(+), 42 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -1662,6 +1662,44 @@ static void thermal_zone_device_resume(s tz->resuming = false; } +static void thermal_zone_pm_prepare(struct thermal_zone_device *tz) +{ + guard(thermal_zone)(tz); + + if (tz->resuming) { + /* + * thermal_zone_device_resume() queued up for this zone has not + * acquired the lock yet, so release it to let the function run + * and wait util it has done the work. + */ + mutex_unlock(&tz->lock); + + wait_for_completion(&tz->resume); + + mutex_lock(&tz->lock); + } + + tz->suspended = true; +} + +static void thermal_zone_pm_complete(struct thermal_zone_device *tz) +{ + guard(thermal_zone)(tz); + + cancel_delayed_work(&tz->poll_queue); + + reinit_completion(&tz->resume); + tz->resuming = true; + + /* + * Replace the work function with the resume one, which will restore the + * original work function and schedule the polling work if needed. + */ + INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_resume); + /* Queue up the work without a delay. */ + mod_delayed_work(system_freezable_power_efficient_wq, &tz->poll_queue, 0); +} + static int thermal_pm_notify(struct notifier_block *nb, unsigned long mode, void *_unused) { @@ -1673,27 +1711,8 @@ static int thermal_pm_notify(struct noti case PM_SUSPEND_PREPARE: mutex_lock(&thermal_list_lock); - list_for_each_entry(tz, &thermal_tz_list, node) { - mutex_lock(&tz->lock); - - if (tz->resuming) { - /* - * thermal_zone_device_resume() queued up for - * this zone has not acquired the lock yet, so - * release it to let the function run and wait - * util it has done the work. - */ - mutex_unlock(&tz->lock); - - wait_for_completion(&tz->resume); - - mutex_lock(&tz->lock); - } - - tz->suspended = true; - - mutex_unlock(&tz->lock); - } + list_for_each_entry(tz, &thermal_tz_list, node) + thermal_zone_pm_prepare(tz); mutex_unlock(&thermal_list_lock); break; @@ -1702,27 +1721,8 @@ static int thermal_pm_notify(struct noti case PM_POST_SUSPEND: mutex_lock(&thermal_list_lock); - list_for_each_entry(tz, &thermal_tz_list, node) { - mutex_lock(&tz->lock); - - cancel_delayed_work(&tz->poll_queue); - - reinit_completion(&tz->resume); - tz->resuming = true; - - /* - * Replace the work function with the resume one, which - * will restore the original work function and schedule - * the polling work if needed. - */ - INIT_DELAYED_WORK(&tz->poll_queue, - thermal_zone_device_resume); - /* Queue up the work without a delay. */ - mod_delayed_work(system_freezable_power_efficient_wq, - &tz->poll_queue, 0); - - mutex_unlock(&tz->lock); - } + list_for_each_entry(tz, &thermal_tz_list, node) + thermal_zone_pm_complete(tz); mutex_unlock(&thermal_list_lock); break; From patchwork Sat Sep 14 10:28:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 828772 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EBE9F1CE71F; Sat, 14 Sep 2024 11:11:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312286; cv=none; b=k5aEJsV9JBEc4FS1jQtDfT0FuMGaDpF9nX7PWnbRDtmcn+HoyPPKUOh4S+o9lgKWPigVTWYQSYwzir0m6QYqJkfgunQRZhSCbUNU3IMkvQ+ydcGpTa/wRdToJwsUe4/bMkzb8USBkPEtEWCGol9+K6muEMol2vtScPp8IBlpu60= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312286; c=relaxed/simple; bh=1aGP2ubyvlPoEmFhGtZ1hFKOD0UpMhJppFF6WSwrEmA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HiPnXY5yQ/erx56d4Rlnf/uy7He2ZV+GyFRdalwsF6vT0htlqXE/xZCvqPdjUzIWmj2d73JCS86TeFa4M8s7zp8Wtb0CwaTmuem/3GhIxVjAiRTZjYG0UpqsST0m59wNXLox8j3cggxAHNsBwK2/wVYbDvkBHiS10jTjeTNp1ls= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=mxZD+nC2 reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="mxZD+nC2" 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 6.2.0) id e74fefbdeaa75e17; Sat, 14 Sep 2024 13:11:23 +0200 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 822248532AE; Sat, 14 Sep 2024 13:11:22 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726312282; bh=1aGP2ubyvlPoEmFhGtZ1hFKOD0UpMhJppFF6WSwrEmA=; h=From:Subject:Date; b=mxZD+nC2qi0WsWWYJvxP7JQCAn3mkvaMm0odBTFz4lvvld8hfR0BgNwwNkN13tliz lViaGxKu6r9ZhiQz6ko4zdEgaGi4T/KqwWxOK3F9pTJ4qetzaURvq2O+8DsPTPHRHs cWzFZIYlgp2Qa1OU+KErPOMzHcEnB9ayF+gUdlOD7mE5WqWzR5JPadILx0xU2h1SwX ajWIJTTem/AjyJnvwyykB/zo0jzG1Dhq+tyBPjk0Mf6maXpKEw3b7UhHZlMR9DBNDW x0vBX4cGnj1lHiMwMQ0xATLToMxsluQC+71dhJ2ij/RpRwTOLFZH2dogsFVcPu/uux gIxzBkL50CAyw== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 03/20] thermal: core: Represent suspend-related thermal zone flags as bits Date: Sat, 14 Sep 2024 12:28:43 +0200 Message-ID: <2215885.irdbgypaU6@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=40 Fuz1=40 Fuz2=40 From: Rafael J. Wysocki Instead of using two separate fields in struct thermal_zone_device for representing flags related to thermal zone suspend, represent them explicitly as bits in one u8 "state" field. Subsequently, that field will be used for addressing race conditions related to thermal zone initialization and exit. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 11 +++++------ drivers/thermal/thermal_core.h | 11 +++++++---- 2 files changed, 12 insertions(+), 10 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -497,7 +497,7 @@ void __thermal_zone_device_update(struct int low = -INT_MAX, high = INT_MAX; int temp, ret; - if (tz->suspended || tz->mode != THERMAL_DEVICE_ENABLED) + if (tz->state != TZ_STATE_READY || tz->mode != THERMAL_DEVICE_ENABLED) return; ret = __thermal_zone_get_temp(tz, &temp); @@ -1651,7 +1651,7 @@ static void thermal_zone_device_resume(s guard(thermal_zone)(tz); - tz->suspended = false; + tz->state &= ~(TZ_STATE_FLAG_SUSPENDED | TZ_STATE_FLAG_RESUMING); thermal_debug_tz_resume(tz); thermal_zone_device_init(tz); @@ -1659,14 +1659,13 @@ static void thermal_zone_device_resume(s __thermal_zone_device_update(tz, THERMAL_TZ_RESUME); complete(&tz->resume); - tz->resuming = false; } static void thermal_zone_pm_prepare(struct thermal_zone_device *tz) { guard(thermal_zone)(tz); - if (tz->resuming) { + if (tz->state & TZ_STATE_FLAG_RESUMING) { /* * thermal_zone_device_resume() queued up for this zone has not * acquired the lock yet, so release it to let the function run @@ -1679,7 +1678,7 @@ static void thermal_zone_pm_prepare(stru mutex_lock(&tz->lock); } - tz->suspended = true; + tz->state |= TZ_STATE_FLAG_SUSPENDED; } static void thermal_zone_pm_complete(struct thermal_zone_device *tz) @@ -1689,7 +1688,7 @@ static void thermal_zone_pm_complete(str cancel_delayed_work(&tz->poll_queue); reinit_completion(&tz->resume); - tz->resuming = true; + tz->state |= TZ_STATE_FLAG_RESUMING; /* * Replace the work function with the resume one, which will restore the Index: linux-pm/drivers/thermal/thermal_core.h =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.h +++ linux-pm/drivers/thermal/thermal_core.h @@ -62,6 +62,11 @@ struct thermal_governor { struct list_head governor_list; }; +#define TZ_STATE_FLAG_SUSPENDED BIT(0) +#define TZ_STATE_FLAG_RESUMING BIT(1) + +#define TZ_STATE_READY 0 + /** * struct thermal_zone_device - structure for a thermal zone * @id: unique id number for each thermal zone @@ -103,8 +108,7 @@ struct thermal_governor { * @node: node in thermal_tz_list (in thermal_core.c) * @poll_queue: delayed work for polling * @notify_event: Last notification event - * @suspended: thermal zone suspend indicator - * @resuming: indicates whether or not thermal zone resume is in progress + * @state: current state of the thermal zone * @trips: array of struct thermal_trip objects */ struct thermal_zone_device { @@ -139,8 +143,7 @@ struct thermal_zone_device { struct list_head node; struct delayed_work poll_queue; enum thermal_notify_event notify_event; - bool suspended; - bool resuming; + u8 state; #ifdef CONFIG_THERMAL_DEBUGFS struct thermal_debugfs *debugfs; #endif From patchwork Sat Sep 14 10:30:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 829173 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3CEE07A15A; Sat, 14 Sep 2024 11:11:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312286; cv=none; b=SfmUPGAnM2/+Al2bVsDSpbfJzlHrybRYl9KFUwewOsMdPoYwk/avH5kDLkZfxcSsl6P0MwFyenQmnsE5lzxY7FrKtER8Cm8CTh29Ag3rQch5h86ndkh9RTmBRfUUvDXudsK673Mtk14azzKajh+p6BBQAwaMQQeYUmSK7yZ/p44= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312286; c=relaxed/simple; bh=3Eqp5JGnLDAKSgWRuFCqtDwNpNy+yiRTaOr7QY81dJI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=I6EgHCDJvjwOQHiisixThnGNLTRb80kCXZ9Ul9wGfNjpem1cRaTMDAP6F7EK52GgB2F/p/M3oij5bF8BnE3v2VChBTLYtc9oA/ozYFs91f6ZfLbwY86TqnbOYIgLmfJHx8SvHXmx4ta3lAw6Vwa3BZzhMPgUQdTYJAMNIRqVp7w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=JILsk8L7 reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="JILsk8L7" 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 6.2.0) id 549c2bad012402de; Sat, 14 Sep 2024 13:11:22 +0200 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 B61D38532AE; Sat, 14 Sep 2024 13:11:21 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726312282; bh=3Eqp5JGnLDAKSgWRuFCqtDwNpNy+yiRTaOr7QY81dJI=; h=From:Subject:Date; b=JILsk8L7jBsEwqBMFDZEPONCXvJZ7FvG9//aZ/raj37+Cd4k/Y6nRwQlT2X+umf5x L7DRr3pwVIlDFBgUGShXGBNeQRNhsAE+bs7lkPMUD6UaqeTdQmI47O7UcbLc4TfY2h CRcH475VbtYKMYADJqmF25g9QOrDJen2q0JAVNF9d+x2PdGRsFCfXBvi1UByz0RZIk m1V1EfYzbmGMV3um6+Hct3EaG0Y6/9jYzMV3+8fSQrlhFZcIWnIVLa+mA8/5+O6Dcu JpgxWEDSLSupFfz4T8ESUbNGe4HQOF3P8XdOYWheno6R0PGgIlofbeHngBmc1KuLAa z0JiKAPdzlElw== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 04/20] thermal: core: Mark thermal zones as initializing to start with Date: Sat, 14 Sep 2024 12:30:27 +0200 Message-ID: <2973309.e9J7NaK4W3@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=40 Fuz1=40 Fuz2=40 From: Rafael J. Wysocki After thermal_zone_device_register_with_trips() has called device_register() and it has registered the new thermal zone device with the driver core, user space may access its sysfs attributes and, among other things, it may enable the thermal zone before it is ready. To address this, introduce a new thermal zone state flag for initialization and set it before calling device_register() in thermal_zone_device_register_with_trips(). This causes __thermal_zone_device_update() to return early until the new flag is cleared. To clear it when the thermal zone is ready, introduce a new function called thermal_zone_init_complete() that will also invoke __thermal_zone_device_update() after clearing that flag (both under the thernal zone lock) and make thermal_zone_device_register_with_trips() call the new function instead of checking need_update and calling thermal_zone_device_update() when it is set. After this change, if user space enables the thermal zone prematurely, __thermal_zone_device_update() will return early for it until thermal_zone_init_complete() is called. In turn, if the thermal zone is not enabled by user space before thermal_zone_init_complete() is called, the __thermal_zone_device_update() call in it will return early because the thermal zone has not been enabled yet, but that function will be invoked again by thermal_zone_device_set_mode() when the thermal zone is enabled and it will not return early this time. The checking of need_update is not necessary any more because the __thermal_zone_device_update() calls potentially triggered by cooling device binding take place before calling thermal_zone_init_complete(), so they all will return early, which means that thermal_zone_init_complete() must call __thermal_zone_device_update() in case the thermal zone is enabled prematurely by user space. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 14 +++++++++++--- drivers/thermal/thermal_core.h | 1 + 2 files changed, 12 insertions(+), 3 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -1318,6 +1318,14 @@ static void thermal_zone_add_to_list(str list_add_tail(&tz->node, &thermal_tz_list); } +static void thermal_zone_init_complete(struct thermal_zone_device *tz) +{ + guard(thermal_zone)(tz); + + tz->state &= ~TZ_STATE_FLAG_INIT; + __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); +} + /** * thermal_zone_device_register_with_trips() - register a new thermal zone device * @type: the thermal zone device type @@ -1435,6 +1443,8 @@ thermal_zone_device_register_with_trips( tz->passive_delay_jiffies = msecs_to_jiffies(passive_delay); tz->recheck_delay_jiffies = THERMAL_RECHECK_DELAY; + tz->state = TZ_STATE_FLAG_INIT; + /* sys I/F */ /* Add nodes that are always present via .groups */ result = thermal_zone_create_device_groups(tz); @@ -1486,9 +1496,7 @@ thermal_zone_device_register_with_trips( mutex_unlock(&thermal_list_lock); - /* Update the new thermal zone and mark it as already updated. */ - if (atomic_cmpxchg(&tz->need_update, 1, 0)) - thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); + thermal_zone_init_complete(tz); thermal_notify_tz_create(tz); Index: linux-pm/drivers/thermal/thermal_core.h =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.h +++ linux-pm/drivers/thermal/thermal_core.h @@ -64,6 +64,7 @@ struct thermal_governor { #define TZ_STATE_FLAG_SUSPENDED BIT(0) #define TZ_STATE_FLAG_RESUMING BIT(1) +#define TZ_STATE_FLAG_INIT BIT(2) #define TZ_STATE_READY 0 From patchwork Sat Sep 14 10:31:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 828773 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C848E1CEE87; Sat, 14 Sep 2024 11:09:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312152; cv=none; b=n0VGMmjYkB7MWboH2o14f9sLBIRYJIPrGNKT7wWzRgc9+GOEQzi6zmOcmXXZd1EE0kdObEHIKBrzkbg/HrvX7n1kgTDv5nycW5yhhN+TO1T5GE0u4UivfFdOtB1cf2T0wZxbm7AQSLpEtVTgadOKl/nPULNktAWtepkbzLU5/E8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312152; c=relaxed/simple; bh=w8kkdEpj36L90ciznlhiK8sldUmkY+C4hInsCITqYWg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Est2dlChIaluwEPdHKtL73Bl/Kcj+vc+9hdIYvv6kKqmdz//ME/fTObS0X26VgjKbDSvaQ7ThGUqY5sYQ8+ibwmFS5swnHrXwayMbhbvr9bcTZwk5SVAKojw0iKeIyH3V/2pS6Y6RWAo7YNIgVgEqX/DYU7SwF9yhmscmc21iu8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=dV6U00Me reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="dV6U00Me" 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 6.2.0) id e52e580cb7d3fbf3; Sat, 14 Sep 2024 13:09:08 +0200 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 4DF918532AE; Sat, 14 Sep 2024 13:09:08 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726312148; bh=w8kkdEpj36L90ciznlhiK8sldUmkY+C4hInsCITqYWg=; h=From:Subject:Date; b=dV6U00MeRxkvTex/wF/NTmcthJps7rv4EozLHbeb63VWw8IhAN4tl2P+dJkuKkY4h S64WQrJGTK+81uXuFS7+6oBzOB4Ben5ORZ8QxD9urRNih3yc2AsD6HqQsiZ28jCw4A fkyiUxzyKw7/R4oDu4kScaDDkCvchdCWL+goCPoxH5rQVO9E2OdbDaWh4bLhiyIGvW VcEmg9K3ttkXJe9hbxci7xrywkf2gb0aZIecOf7o5qOeGLFao5+IzjgS+S24yc1pwr AMBX9ZGgP3HZ4QXjoUmyg1IOIllkWZvgOXkv/JMuBy0wur3LfunwQ8dqFpWRsBQE98 WS3qeSuJBhpCQ== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 05/20] thermal: core: Fix race between zone registration and system suspend Date: Sat, 14 Sep 2024 12:31:28 +0200 Message-ID: <3335807.44csPzL39Z@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeejucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgepudenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=35 Fuz1=35 Fuz2=35 From: Rafael J. Wysocki If the registration of a thermal zone takes place at the same time when system suspend is started, thermal_pm_notify() can run before the new thermal zone is added to thermal_tz_list and its "suspended" flag will not be set. Consequently, if __thermal_zone_device_update() is called for that thermal zone, it will not return early as expected which may cause some destructive interference with the system suspend or resume flow to occur. To avoid that, make thermal_zone_init_complete() introduced previously set the "suspended" flag for new thermal zones if it runs during system suspend or resume. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -39,6 +39,8 @@ static DEFINE_MUTEX(thermal_governor_loc static struct thermal_governor *def_governor; +static bool thermal_pm_suspended; + /* * Governor section: set of functions to handle thermal governors * @@ -1323,6 +1325,14 @@ static void thermal_zone_init_complete(s guard(thermal_zone)(tz); tz->state &= ~TZ_STATE_FLAG_INIT; + /* + * If system suspend or resume is in progress at this point, the + * new thermal zone needs to be marked as suspended because + * thermal_pm_notify() has run already. + */ + if (thermal_pm_suspended) + tz->state |= TZ_STATE_FLAG_SUSPENDED; + __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); } @@ -1494,10 +1504,10 @@ thermal_zone_device_register_with_trips( list_for_each_entry(cdev, &thermal_cdev_list, node) thermal_zone_cdev_bind(tz, cdev); - mutex_unlock(&thermal_list_lock); - thermal_zone_init_complete(tz); + mutex_unlock(&thermal_list_lock); + thermal_notify_tz_create(tz); thermal_debug_tz_add(tz); @@ -1718,6 +1728,8 @@ static int thermal_pm_notify(struct noti case PM_SUSPEND_PREPARE: mutex_lock(&thermal_list_lock); + thermal_pm_suspended = true; + list_for_each_entry(tz, &thermal_tz_list, node) thermal_zone_pm_prepare(tz); @@ -1728,6 +1740,8 @@ static int thermal_pm_notify(struct noti case PM_POST_SUSPEND: mutex_lock(&thermal_list_lock); + thermal_pm_suspended = false; + list_for_each_entry(tz, &thermal_tz_list, node) thermal_zone_pm_complete(tz); From patchwork Sat Sep 14 10:32:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 829174 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ADDF61CEAA9; Sat, 14 Sep 2024 11:09:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312151; cv=none; b=cvRdaEE1Oq2idzLZJDl8ZhNm4rraNLMNhKMezfPojw0kMUFPDcJ7ai/RWEhFuCewm3L93rOwKFsDjm4DCfYlPQ+cnqTLSVZhfGIt7YzDv6T4t2TMO0+TviMV6mU216trJeQevXOpETV6YHzhGSL7SOO1U84JAKxw8oXI+SsIf7g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312151; c=relaxed/simple; bh=sq2UmYbbnOGBr85+l3Ku3qnhEozpZ2jyvuuLubWqfKQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=q5kI0IFb4DYtMW7x+2wRdW1yp1cyT5QnQr8ltnG/CrlUNoRDKZqzNNXHDHv3jOFRluPn+O85eatz18a5Ey6ULqHs7bLiwf+c3vNUuKWgg9/J+UhTcKvLDyFocW7Z+iBzM+k///gsla8y3CMr5dO+pP69aYwSLQlNNxKRhiCQxHM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=eRGuhE01 reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="eRGuhE01" 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 6.2.0) id d45f49d283229167; Sat, 14 Sep 2024 13:09:07 +0200 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 442BF853358; Sat, 14 Sep 2024 13:09:07 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726312147; bh=sq2UmYbbnOGBr85+l3Ku3qnhEozpZ2jyvuuLubWqfKQ=; h=From:Subject:Date; b=eRGuhE01zhmibwHIvieYYdaLcSFQid7rGN2ag/5mfi8jiiX342yrdaWjPfNhwFexl 7zlj1rrMlXJASmyjCPk7RlnUJKP4B/N+VNTbrr7cTcHkPSRR63T66ydUQTdQ9d15og Q7FLdzfBAZH2L2eik3AFnu/kndqwlYEaXkZPg5/Ue5VW3xQvWpop0LafJWGpICC6oC btUrqUL2Ge1Cn+WS7V6F9d6n3KfN7YUvSsQgG1m9aMrsb23VN/BaDZWpNp5yQaJ0FQ sBcuXCI49muP2wiqWg5yZyfWPsgcjwgBkg4zW4MiO2gKdHgKDLwuK40joyoUkq05p0 6BXrkacORofBA== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 06/20] thermal: core: Consolidate thermal zone locking during initialization Date: Sat, 14 Sep 2024 12:32:45 +0200 Message-ID: <10548633.nUPlyArG6x@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeejucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgepudenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=35 Fuz1=35 Fuz2=35 From: Rafael J. Wysocki The part of thermal zone initialization carried out under thermal_list_lock acquires the thermal zone lock and releases it multiple times back-to-back which is not really necessary. Instead of doing this, acquire the thermal zone lock once after acquiring thermal_list_lock and release it along with that lock. For this purpose, move all of the code in question to thermal_zone_init_complete() introduced previously and provide an "unloacked" variant of thermal_zone_cdev_bind() to be invoked from there. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 40 ++++++++++++++++++++-------------------- 1 file changed, 20 insertions(+), 20 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -919,16 +919,14 @@ void print_bind_err_msg(struct thermal_z cdev->type, thermal_zone_trip_id(tz, &td->trip), ret); } -static void thermal_zone_cdev_bind(struct thermal_zone_device *tz, - struct thermal_cooling_device *cdev) +static void __thermal_zone_cdev_bind(struct thermal_zone_device *tz, + struct thermal_cooling_device *cdev) { struct thermal_trip_desc *td; if (!tz->ops.should_bind) return; - guard(thermal_zone)(tz); - for_each_trip_desc(tz, td) { struct cooling_spec c = { .upper = THERMAL_NO_LIMIT, @@ -946,6 +944,14 @@ static void thermal_zone_cdev_bind(struc } } +static void thermal_zone_cdev_bind(struct thermal_zone_device *tz, + struct thermal_cooling_device *cdev) +{ + guard(thermal_zone)(tz); + + __thermal_zone_cdev_bind(tz, cdev); +} + /** * __thermal_cooling_device_register() - register a new thermal cooling device * @np: a pointer to a device tree node. @@ -1313,17 +1319,20 @@ int thermal_zone_get_crit_temp(struct th } EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp); -static void thermal_zone_add_to_list(struct thermal_zone_device *tz) +static void thermal_zone_init_complete(struct thermal_zone_device *tz) { - guard(thermal_zone)(tz); + struct thermal_cooling_device *cdev; + + mutex_lock(&thermal_list_lock); list_add_tail(&tz->node, &thermal_tz_list); -} -static void thermal_zone_init_complete(struct thermal_zone_device *tz) -{ guard(thermal_zone)(tz); + /* Bind cooling devices for this zone. */ + list_for_each_entry(cdev, &thermal_cdev_list, node) + __thermal_zone_cdev_bind(tz, cdev); + tz->state &= ~TZ_STATE_FLAG_INIT; /* * If system suspend or resume is in progress at this point, the @@ -1334,6 +1343,8 @@ static void thermal_zone_init_complete(s tz->state |= TZ_STATE_FLAG_SUSPENDED; __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); + + mutex_unlock(&thermal_list_lock); } /** @@ -1370,7 +1381,6 @@ thermal_zone_device_register_with_trips( unsigned int polling_delay) { const struct thermal_trip *trip = trips; - struct thermal_cooling_device *cdev; struct thermal_zone_device *tz; struct thermal_trip_desc *td; int id; @@ -1496,18 +1506,8 @@ thermal_zone_device_register_with_trips( goto unregister; } - mutex_lock(&thermal_list_lock); - - thermal_zone_add_to_list(tz); - - /* Bind cooling devices for this zone */ - list_for_each_entry(cdev, &thermal_cdev_list, node) - thermal_zone_cdev_bind(tz, cdev); - thermal_zone_init_complete(tz); - mutex_unlock(&thermal_list_lock); - thermal_notify_tz_create(tz); thermal_debug_tz_add(tz); From patchwork Sat Sep 14 10:34:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 828774 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0508A1CDFD5; Sat, 14 Sep 2024 11:07:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312030; cv=none; b=GODhNhIKEuMxdhklRLJ27SNrc8jHaJMAxlwz7eoj7yQvtDCEBi8mnNOdlOhVPhAWahqzk3FbySlfBd97KdnzkLs/z6BnjLwmEp7VaEHLyQje5DxAVuUWu1ieYLV1+NiedbtBI4Dn+RquJq4kkjFW0Ei26nhuMeHyML2wqFjUszo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312030; c=relaxed/simple; bh=pbuB+DXAFqYaCx2qxAElUt1m641oVTnWEEOF+ktc0N0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DIAdITGcrMdEk/trDc65TrlAGnSUIER5Ib09HIvSiqdX7SUxcS7FVGpa9zsTPOtAXitC/xpIx2MXtMUP8X0Z4BJhUt66/a/IaWaMaXqTAsXpa6//h+019klgwlPPGy26KFMCz2ss+qGFz34ZN5Dmra/vixwXLvdar1lDvaYb7ac= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=nrYeQpi5 reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="nrYeQpi5" 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 6.2.0) id 9133f7438f486c6e; Sat, 14 Sep 2024 13:07:07 +0200 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 7C1708532AE; Sat, 14 Sep 2024 13:07:06 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726312026; bh=pbuB+DXAFqYaCx2qxAElUt1m641oVTnWEEOF+ktc0N0=; h=From:Subject:Date; b=nrYeQpi5LSq/fe7en8vGuGm80zICtUU24v//RZboPJ7n3YZ36Vi6SSrzzGzmY7ms8 k1lEIQLPKGm6evkgAIfkXQoMv/eJF581EeHBz31P09b2XJUa1spHzonQEQ9rZo52eA gK5A88p4prxIMjoF5BuN2IE5KGRdKtpyalcNitebTGoV9lWGbDhuJDaWU+yeQ0+227 ps/lUT1yT3vDUATYK/cvN4W+IoSv/VArvoHFvKKax29ZhlfprXo81qesg+HrmqybFi Mgu0eNFWEGKj9xjTTaqAYDuWu3sRY/RueQySo0EhKRh/31UF4EUCR2l9yl3pV0jntC vwPgBhSw8mtCw== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 07/20] thermal: core: Mark thermal zones as exiting before unregistration Date: Sat, 14 Sep 2024 12:34:06 +0200 Message-ID: <1997536.PYKUYFuaPT@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeejucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=30 Fuz1=30 Fuz2=30 From: Rafael J. Wysocki In analogy with a previous change in the thermal zone registration code path, to ensure that __thermal_zone_device_update() will return early for thermal zones that are going away, introduce a thermal zone state flag representing the "exit" state and set it along with deleting the thermal zone from thermal_tz_list. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 5 +++-- drivers/thermal/thermal_core.h | 1 + 2 files changed, 4 insertions(+), 2 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -1563,10 +1563,11 @@ struct device *thermal_zone_device(struc } EXPORT_SYMBOL_GPL(thermal_zone_device); -static void thermal_zone_del_from_list(struct thermal_zone_device *tz) +static void thermal_zone_exit(struct thermal_zone_device *tz) { guard(thermal_zone)(tz); + tz->state |= TZ_STATE_FLAG_EXIT; list_del(&tz->node); } @@ -1594,7 +1595,7 @@ void thermal_zone_device_unregister(stru return; } - thermal_zone_del_from_list(tz); + thermal_zone_exit(tz); /* Unbind all cdevs associated with 'this' thermal zone */ list_for_each_entry(cdev, &thermal_cdev_list, node) Index: linux-pm/drivers/thermal/thermal_core.h =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.h +++ linux-pm/drivers/thermal/thermal_core.h @@ -65,6 +65,7 @@ struct thermal_governor { #define TZ_STATE_FLAG_SUSPENDED BIT(0) #define TZ_STATE_FLAG_RESUMING BIT(1) #define TZ_STATE_FLAG_INIT BIT(2) +#define TZ_STATE_FLAG_EXIT BIT(3) #define TZ_STATE_READY 0 From patchwork Sat Sep 14 10:35:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 829175 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6FFCF7A15A; Sat, 14 Sep 2024 11:07:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312029; cv=none; b=akeNquf/Y74iIv6X2SlbUg2B/KSZloivvz0FD8sDtQ3DwvGRLi20I/bc7M80QFuFmPu7rp9fNcX/1lf3Nn1gr7JGF6o+xq+NOwcrcK0Ro6HYUfoie8k3q1BCYsDyAVvAOg0Xdz2If2IJ1mF05h+xH29bZCGLA3ck+siX0XLcBI4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726312029; c=relaxed/simple; bh=PtnD5ql8uhjYjbo53dvYode4Eg5InbMjg9FywYZMa/w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=EcN8pOaVaFnXhM49s9r2PM3K2e9S+05zR/t4rcm0uYQRjXscRmalBpV4nPv1nbAHHcsTpfcbu5P8p/0qnqfWSikoE4MDkHUbe73k8P0h84XVGepf38E3pFhDMGWUSpArZxNXz4bMFe+yvlWZvXiFAP9BcC+RoF62Hc43al6hfiw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=LmWW5tGq reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="LmWW5tGq" 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 6.2.0) id b54674465a1ca381; Sat, 14 Sep 2024 13:07:05 +0200 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 9BC2C8532AE; Sat, 14 Sep 2024 13:07:04 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726312025; bh=PtnD5ql8uhjYjbo53dvYode4Eg5InbMjg9FywYZMa/w=; h=From:Subject:Date; b=LmWW5tGqQH549cIqM5GW3fAW1fGKJJxFtdgx06dqnTJylZ0nZC/Azu3B9bS5CmWDT VFXvrYOU7FbLGnVuCT1O8r65poztnbZjYURBESIQ2OeDO8RgiIQCAz+r5JTm+RySnN q3ZJAZCPltq0PX5BLdAyq25oIgk8qCTZhru9Bpa9zyFcqTSUTqu6yzkeYaOYnphx9I yuKm2xIqq57543cICNvj82mtTvDKHnP2PpcWTKHVAws7qfyfF3ubdpM7F8sRhyMGo9 Qh3oe50J5cM5LX7+EDKFB84oqj8WVD6PlP32C/cG3f7PCvz4WtqfZjyEUa4SBtxeVj KUw+bmboIchlg== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 08/20] thermal: core: Consolidate thermal zone locking in the exit path Date: Sat, 14 Sep 2024 12:35:20 +0200 Message-ID: <7729094.EvYhyI6sBW@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeejucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=30 Fuz1=30 Fuz2=30 From: Rafael J. Wysocki In analogy with a previous change in the thermal zone initialization path, to avoid acquiring the thermal zone lock and releasing it multiple times back-to-back unnecessarily, move all of the code running under thermal_list_lock in thermal_zone_device_unregister() into thermal_zone_exit() and make the latter acquire the thermal zone lock only once and release it along with thermal_list_lock. For this purpose, provide an "unlocked" variant of thermal_zone_cdev_unbind() to be called by thermal_zone_exit() under the thermal zone lock. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 53 +++++++++++++++++++++++------------------ 1 file changed, 30 insertions(+), 23 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -1249,17 +1249,23 @@ unlock_list: } EXPORT_SYMBOL_GPL(thermal_cooling_device_update); -static void thermal_zone_cdev_unbind(struct thermal_zone_device *tz, +static void __thermal_zone_cdev_unbind(struct thermal_zone_device *tz, struct thermal_cooling_device *cdev) { struct thermal_trip_desc *td; - guard(thermal_zone)(tz); - for_each_trip_desc(tz, td) thermal_unbind_cdev_from_trip(tz, td, cdev); } +static void thermal_zone_cdev_unbind(struct thermal_zone_device *tz, + struct thermal_cooling_device *cdev) +{ + guard(thermal_zone)(tz); + + __thermal_zone_cdev_unbind(tz, cdev); +} + /** * thermal_cooling_device_unregister - removes a thermal cooling device * @cdev: the thermal cooling device to remove. @@ -1563,12 +1569,31 @@ struct device *thermal_zone_device(struc } EXPORT_SYMBOL_GPL(thermal_zone_device); -static void thermal_zone_exit(struct thermal_zone_device *tz) +static bool thermal_zone_exit(struct thermal_zone_device *tz) { + struct thermal_cooling_device *cdev; + bool ret = true; + + mutex_lock(&thermal_list_lock); + + if (list_empty(&tz->node)) { + ret = false; + goto unlock; + } + guard(thermal_zone)(tz); tz->state |= TZ_STATE_FLAG_EXIT; list_del(&tz->node); + + /* Unbind all cdevs associated with this thermal zone. */ + list_for_each_entry(cdev, &thermal_cdev_list, node) + __thermal_zone_cdev_unbind(tz, cdev); + +unlock: + mutex_unlock(&thermal_list_lock); + + return ret; } /** @@ -1577,31 +1602,13 @@ static void thermal_zone_exit(struct the */ void thermal_zone_device_unregister(struct thermal_zone_device *tz) { - struct thermal_cooling_device *cdev; - struct thermal_zone_device *pos = NULL; - if (!tz) return; thermal_debug_tz_remove(tz); - mutex_lock(&thermal_list_lock); - list_for_each_entry(pos, &thermal_tz_list, node) - if (pos == tz) - break; - if (pos != tz) { - /* thermal zone device not found */ - mutex_unlock(&thermal_list_lock); + if (!thermal_zone_exit(tz)) return; - } - - thermal_zone_exit(tz); - - /* Unbind all cdevs associated with 'this' thermal zone */ - list_for_each_entry(cdev, &thermal_cdev_list, node) - thermal_zone_cdev_unbind(tz, cdev); - - mutex_unlock(&thermal_list_lock); cancel_delayed_work_sync(&tz->poll_queue); From patchwork Sat Sep 14 10:36:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 828775 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 119A41CF2B1; Sat, 14 Sep 2024 11:03:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311827; cv=none; b=HQiv2vHcOfLj7bxGilcslCEAnQs2xwsIrAx16tP6bCeOLBlhI7VRPj4/2NAOgsw0vMgjwKcKt59VqUu0zcUnj2J6dns0JpOXoJTbmXO/rEIr6Qxp9Iqi46Lrmm9MCbGPyFbk/T+mNKtFSvjd72/6W1Y5wH08zbZk0jb3P5OhsIo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311827; c=relaxed/simple; bh=9WXyKvAcLO2BMZyBokhszmnjfpwu44G6g4cyK24kuwI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=E3WaN0su0n1crrAPjcn6BENeIax6+uhgpqIet/595jIolCMSOZCOlxp7LSvaI0FywBurmHAJOqNem9z8TCumJZA2sA9D5lhrmYqiJADd9VdMu6QO6vp8NDsxVkQNx+k2ZG+6m5MZEMT4MQ78j1NUdtZcWi1NCMky1taO6YVxL6k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=Tq89ZFBa reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="Tq89ZFBa" 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 6.2.0) id 5b635f05774a90d9; Sat, 14 Sep 2024 13:03:43 +0200 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 1725F8532AE; Sat, 14 Sep 2024 13:03:42 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311822; bh=9WXyKvAcLO2BMZyBokhszmnjfpwu44G6g4cyK24kuwI=; h=From:Subject:Date; b=Tq89ZFBa9frfgbK0J4wzD807UM9ILLu8Uiki9tGXyiOJJ3gvj8N5m5qpPrXsn7ldY TeoXDhU6BXJs99gqFt9h1S5xNBgHfPm9sUxXm63phvXGRJEH2SgMmnnE7HkXlJWzev TklUPBIJGW8F/hU1YFIbKM+YZVT8og9n5kDJWdGse0WKM7aW2GxaWs7m8fPZvMBcuM driZAi7MsbxnKZ59wL8bbYDpqNOtak5zxpd8IfxsVxJUjrkhezEc9Yg2fzGDYDDR6B BvlNKxceDGVu5kRcCYcIdZ8HAhS1XD6N+xrrgvaxt6H6hSjorPzq4W6KkuRB4ReFxV IZLB1/fQDtHZQ== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 09/20] thermal: core: Update thermal zones after cooling device binding Date: Sat, 14 Sep 2024 12:36:51 +0200 Message-ID: <3603909.iIbC2pHGDl@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgepudenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=25 Fuz1=25 Fuz2=25 From: Rafael J. Wysocki If a new cooling device is registered and it is bound to at least one trip point in a given thermal zone, that thermal zone needs to be updated via __thermal_zone_device_update(). Instead of doing this with the help of the need_update atomic field in struct thermal_zone_device, which is not particularly straightforward, make __thermal_zone_cdev_bind() return a bool value indicating whether or not the given thermal zone needs to be updated because a new cooling device has been bound to it and update thermal_zone_cdev_bind() to call __thermal_zone_device_update() when this value is "true". No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -919,13 +919,14 @@ void print_bind_err_msg(struct thermal_z cdev->type, thermal_zone_trip_id(tz, &td->trip), ret); } -static void __thermal_zone_cdev_bind(struct thermal_zone_device *tz, +static bool __thermal_zone_cdev_bind(struct thermal_zone_device *tz, struct thermal_cooling_device *cdev) { struct thermal_trip_desc *td; + bool update_tz = false; if (!tz->ops.should_bind) - return; + return false; for_each_trip_desc(tz, td) { struct cooling_spec c = { @@ -939,9 +940,15 @@ static void __thermal_zone_cdev_bind(str continue; ret = thermal_bind_cdev_to_trip(tz, td, cdev, &c); - if (ret) + if (ret) { print_bind_err_msg(tz, td, cdev, ret); + continue; + } + + update_tz = true; } + + return update_tz; } static void thermal_zone_cdev_bind(struct thermal_zone_device *tz, @@ -949,7 +956,8 @@ static void thermal_zone_cdev_bind(struc { guard(thermal_zone)(tz); - __thermal_zone_cdev_bind(tz, cdev); + if (__thermal_zone_cdev_bind(tz, cdev)) + __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); } /** @@ -974,7 +982,7 @@ __thermal_cooling_device_register(struct const struct thermal_cooling_device_ops *ops) { struct thermal_cooling_device *cdev; - struct thermal_zone_device *pos = NULL; + struct thermal_zone_device *pos; unsigned long current_state; int id, ret; @@ -1050,11 +1058,6 @@ __thermal_cooling_device_register(struct list_for_each_entry(pos, &thermal_tz_list, node) thermal_zone_cdev_bind(pos, cdev); - list_for_each_entry(pos, &thermal_tz_list, node) - if (atomic_cmpxchg(&pos->need_update, 1, 0)) - thermal_zone_device_update(pos, - THERMAL_EVENT_UNSPECIFIED); - mutex_unlock(&thermal_list_lock); return cdev; From patchwork Sat Sep 14 10:37:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 829176 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 537C54437; Sat, 14 Sep 2024 11:03:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311822; cv=none; b=pVqUK86hpzP3AFSgaAU9mOqzS12dsK5XBiMX8QN3qhxdlhlF+0E2A1y/0jsHmpHSJyx98IGW3X9UsZha3NZ4N/CIo2PswR571Ylx2OFh74vQzoyhr/zvlQgCO5CgZsNG9KXEwStDt9ZYAJ3ghbhw24ncDBxtGp8u0RLsQYLLXV0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311822; c=relaxed/simple; bh=LzuSMsQ8zYf06qhRsW0uKP+Ha8RA1FTKiyM9mfxAlTU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HKKQxzvLnSjaLwPM4R7uzqiRuh/erTetom30sQvbFG0+ysJCcRBbUunPrCK1rQiLuZ3zuz2kqxsjs3le9Li8QZsZBzVihuIoxms1/w2wpp6/YRkJdt7sZtWkBk8cqDc8dDrTDmCNZnGP4CVNqOtSSFu0eVGKSq5gwZ8/Dq3oxow= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=CMfpSeqt reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="CMfpSeqt" 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 6.2.0) id 1852fd98ce71f1db; Sat, 14 Sep 2024 13:03:38 +0200 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 9B309853357; Sat, 14 Sep 2024 13:03:36 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311817; bh=LzuSMsQ8zYf06qhRsW0uKP+Ha8RA1FTKiyM9mfxAlTU=; h=From:Subject:Date; b=CMfpSeqtK4rm4xEv9UeS/BWPW2xm389zlo9GYsNzfU2jr0VJcAmcEbwvkGE9iBkLE KDJs/rMCIvEk9RHTKzgPeJjFQ6vs7KnBJE5Qs/K/ulKFArkUvUofOj52bAR0B6tSfj do5sHJRzVUxQe5RlV+j1ZEuqgJrTrDzubnNLujEN4Hdaj9pvVJ3XCIfF10/sj/IuPw 0/LGqoA7iP1wyDxbQYikXn4DLvw35eMDq39kff7T8zFXaVXv79o2v6+xJUEe741niH yWtvMTnJeLwoFxgpJV5i1neOi9Q/bBZfCKvYavcAbQpOvPkpgzvCjvOr7HujZflh0F KFn+ZjGRneFsA== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 10/20] thermal: core: Drop need_update field from struct thermal_zone_device Date: Sat, 14 Sep 2024 12:37:46 +0200 Message-ID: <3261209.5fSG56mABF@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgepgeenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=25 Fuz1=25 Fuz2=25 From: Rafael J. Wysocki After previous changes, the need_update field in struct thermal_zone_device is only set and never read, so drop it. No functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 4 ---- drivers/thermal/thermal_core.h | 2 -- 2 files changed, 6 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -826,7 +826,6 @@ static int thermal_bind_cdev_to_trip(str if (!result) { list_add_tail(&dev->trip_node, &td->thermal_instances); list_add_tail(&dev->cdev_node, &cdev->thermal_instances); - atomic_set(&tz->need_update, 1); thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV); } @@ -1480,9 +1479,6 @@ thermal_zone_device_register_with_trips( if (result) goto remove_id; - /* A new thermal zone needs to be updated anyway. */ - atomic_set(&tz->need_update, 1); - result = dev_set_name(&tz->device, "thermal_zone%d", tz->id); if (result) { thermal_zone_destroy_device_groups(tz); Index: linux-pm/drivers/thermal/thermal_core.h =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.h +++ linux-pm/drivers/thermal/thermal_core.h @@ -99,7 +99,6 @@ struct thermal_governor { trip point. * @prev_high_trip: the above current temperature if you've crossed a passive trip point. - * @need_update: if equals 1, thermal_zone_device_update needs to be invoked. * @ops: operations this &thermal_zone_device supports * @tzp: thermal zone parameters * @governor: pointer to the governor for this thermal zone @@ -135,7 +134,6 @@ struct thermal_zone_device { int passive; int prev_low_trip; int prev_high_trip; - atomic_t need_update; struct thermal_zone_device_ops ops; struct thermal_zone_params *tzp; struct thermal_governor *governor; From patchwork Sat Sep 14 10:38:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. 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Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 11/20] thermal: core: Separate code running under thermal_list_lock Date: Sat, 14 Sep 2024 12:38:45 +0200 Message-ID: <1822468.VLH7GnMWUR@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=20 Fuz1=20 Fuz2=20 From: Rafael J. Wysocki To prepare for a subsequent change that will switch over the thermal core to using a mutex guard for thermal_list_lock management, move the code running under thermal_list_lock during the initialization and unregistration of cooling devices into separate functions. While at it, drop some comments that do not add value. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 64 +++++++++++++++++++++++------------------ 1 file changed, 36 insertions(+), 28 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -959,6 +959,20 @@ static void thermal_zone_cdev_bind(struc __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); } +static void thermal_cooling_device_init_complete(struct thermal_cooling_device *cdev) +{ + struct thermal_zone_device *tz; + + mutex_lock(&thermal_list_lock); + + list_add(&cdev->node, &thermal_cdev_list); + + list_for_each_entry(tz, &thermal_tz_list, node) + thermal_zone_cdev_bind(tz, cdev); + + mutex_unlock(&thermal_list_lock); +} + /** * __thermal_cooling_device_register() - register a new thermal cooling device * @np: a pointer to a device tree node. @@ -981,7 +995,6 @@ __thermal_cooling_device_register(struct const struct thermal_cooling_device_ops *ops) { struct thermal_cooling_device *cdev; - struct thermal_zone_device *pos; unsigned long current_state; int id, ret; @@ -1048,16 +1061,7 @@ __thermal_cooling_device_register(struct if (current_state <= cdev->max_state) thermal_debug_cdev_add(cdev, current_state); - /* Add 'this' new cdev to the global cdev list */ - mutex_lock(&thermal_list_lock); - - list_add(&cdev->node, &thermal_cdev_list); - - /* Update binding information for 'this' new cdev */ - list_for_each_entry(pos, &thermal_tz_list, node) - thermal_zone_cdev_bind(pos, cdev); - - mutex_unlock(&thermal_list_lock); + thermal_cooling_device_init_complete(cdev); return cdev; @@ -1268,38 +1272,42 @@ static void thermal_zone_cdev_unbind(str __thermal_zone_cdev_unbind(tz, cdev); } -/** - * thermal_cooling_device_unregister - removes a thermal cooling device - * @cdev: the thermal cooling device to remove. - * - * thermal_cooling_device_unregister() must be called when a registered - * thermal cooling device is no longer needed. - */ -void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) +static bool thermal_cooling_device_exit(struct thermal_cooling_device *cdev) { struct thermal_zone_device *tz; - - if (!cdev) - return; - - thermal_debug_cdev_remove(cdev); + bool ret = true; mutex_lock(&thermal_list_lock); if (!thermal_cooling_device_present(cdev)) { - mutex_unlock(&thermal_list_lock); - return; + ret = false; + goto unlock; } list_del(&cdev->node); - /* Unbind all thermal zones associated with 'this' cdev */ list_for_each_entry(tz, &thermal_tz_list, node) thermal_zone_cdev_unbind(tz, cdev); +unlock: mutex_unlock(&thermal_list_lock); - device_unregister(&cdev->device); + return ret; +} + +/** + * thermal_cooling_device_unregister() - removes a thermal cooling device + * @cdev: Thermal cooling device to remove. + */ +void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) +{ + if (!cdev) + return; + + thermal_debug_cdev_remove(cdev); + + if (thermal_cooling_device_exit(cdev)) + device_unregister(&cdev->device); } EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister); From patchwork Sat Sep 14 10:40:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. 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Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 12/20] thermal: core: Manage thermal_list_lock using a mutex guard Date: Sat, 14 Sep 2024 12:40:00 +0200 Message-ID: <2018087.usQuhbGJ8B@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=20 Fuz1=20 Fuz2=20 From: Rafael J. Wysocki Switch over the thermal core to using a mutex guard for thermal_list_lock management. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 151 ++++++++++++++++++----------------------- 1 file changed, 69 insertions(+), 82 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -139,7 +139,7 @@ int thermal_register_governor(struct the def_governor = governor; } - mutex_lock(&thermal_list_lock); + guard(mutex)(&thermal_list_lock); list_for_each_entry(pos, &thermal_tz_list, node) { /* @@ -162,7 +162,6 @@ int thermal_register_governor(struct the } } - mutex_unlock(&thermal_list_lock); mutex_unlock(&thermal_governor_lock); return err; @@ -180,7 +179,9 @@ void thermal_unregister_governor(struct if (!__find_governor(governor->name)) goto exit; - mutex_lock(&thermal_list_lock); + list_del(&governor->governor_list); + + guard(mutex)(&thermal_list_lock); list_for_each_entry(pos, &thermal_tz_list, node) { if (!strncasecmp(pos->governor->name, governor->name, @@ -188,8 +189,6 @@ void thermal_unregister_governor(struct thermal_set_governor(pos, NULL); } - mutex_unlock(&thermal_list_lock); - list_del(&governor->governor_list); exit: mutex_unlock(&thermal_governor_lock); } @@ -681,50 +680,50 @@ int for_each_thermal_cooling_device(int void *), void *data) { struct thermal_cooling_device *cdev; - int ret = 0; - mutex_lock(&thermal_list_lock); + guard(mutex)(&thermal_list_lock); + list_for_each_entry(cdev, &thermal_cdev_list, node) { + int ret; + ret = cb(cdev, data); if (ret) - break; + return ret; } - mutex_unlock(&thermal_list_lock); - return ret; + return 0; } int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *), void *data) { struct thermal_zone_device *tz; - int ret = 0; - mutex_lock(&thermal_list_lock); + guard(mutex)(&thermal_list_lock); + list_for_each_entry(tz, &thermal_tz_list, node) { + int ret; + ret = cb(tz, data); if (ret) - break; + return ret; } - mutex_unlock(&thermal_list_lock); - return ret; + return 0; } struct thermal_zone_device *thermal_zone_get_by_id(int id) { - struct thermal_zone_device *tz, *match = NULL; + struct thermal_zone_device *tz; + + guard(mutex)(&thermal_list_lock); - mutex_lock(&thermal_list_lock); list_for_each_entry(tz, &thermal_tz_list, node) { - if (tz->id == id) { - match = tz; - break; - } + if (tz->id == id) + return tz; } - mutex_unlock(&thermal_list_lock); - return match; + return NULL; } /* @@ -963,14 +962,12 @@ static void thermal_cooling_device_init_ { struct thermal_zone_device *tz; - mutex_lock(&thermal_list_lock); + guard(mutex)(&thermal_list_lock); list_add(&cdev->node, &thermal_cdev_list); list_for_each_entry(tz, &thermal_tz_list, node) thermal_zone_cdev_bind(tz, cdev); - - mutex_unlock(&thermal_list_lock); } /** @@ -1204,10 +1201,10 @@ void thermal_cooling_device_update(struc * Hold thermal_list_lock throughout the update to prevent the device * from going away while being updated. */ - mutex_lock(&thermal_list_lock); + guard(mutex)(&thermal_list_lock); if (!thermal_cooling_device_present(cdev)) - goto unlock_list; + return; /* * Update under the cdev lock to prevent the state from being set beyond @@ -1249,9 +1246,6 @@ void thermal_cooling_device_update(struc unlock: mutex_unlock(&cdev->lock); - -unlock_list: - mutex_unlock(&thermal_list_lock); } EXPORT_SYMBOL_GPL(thermal_cooling_device_update); @@ -1275,24 +1269,18 @@ static void thermal_zone_cdev_unbind(str static bool thermal_cooling_device_exit(struct thermal_cooling_device *cdev) { struct thermal_zone_device *tz; - bool ret = true; - mutex_lock(&thermal_list_lock); + guard(mutex)(&thermal_list_lock); - if (!thermal_cooling_device_present(cdev)) { - ret = false; - goto unlock; - } + if (!thermal_cooling_device_present(cdev)) + return false; list_del(&cdev->node); list_for_each_entry(tz, &thermal_tz_list, node) thermal_zone_cdev_unbind(tz, cdev); -unlock: - mutex_unlock(&thermal_list_lock); - - return ret; + return true; } /** @@ -1339,7 +1327,7 @@ static void thermal_zone_init_complete(s { struct thermal_cooling_device *cdev; - mutex_lock(&thermal_list_lock); + guard(mutex)(&thermal_list_lock); list_add_tail(&tz->node, &thermal_tz_list); @@ -1359,8 +1347,6 @@ static void thermal_zone_init_complete(s tz->state |= TZ_STATE_FLAG_SUSPENDED; __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); - - mutex_unlock(&thermal_list_lock); } /** @@ -1579,14 +1565,11 @@ EXPORT_SYMBOL_GPL(thermal_zone_device); static bool thermal_zone_exit(struct thermal_zone_device *tz) { struct thermal_cooling_device *cdev; - bool ret = true; - mutex_lock(&thermal_list_lock); + guard(mutex)(&thermal_list_lock); - if (list_empty(&tz->node)) { - ret = false; - goto unlock; - } + if (list_empty(&tz->node)) + return false; guard(thermal_zone)(tz); @@ -1597,10 +1580,7 @@ static bool thermal_zone_exit(struct the list_for_each_entry(cdev, &thermal_cdev_list, node) __thermal_zone_cdev_unbind(tz, cdev); -unlock: - mutex_unlock(&thermal_list_lock); - - return ret; + return true; } /** @@ -1654,24 +1634,23 @@ struct thermal_zone_device *thermal_zone unsigned int found = 0; if (!name) - goto exit; + return ERR_PTR(-EINVAL); + + guard(mutex)(&thermal_list_lock); - mutex_lock(&thermal_list_lock); list_for_each_entry(pos, &thermal_tz_list, node) if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) { found++; ref = pos; } - mutex_unlock(&thermal_list_lock); - /* nothing has been found, thus an error code for it */ - if (found == 0) - ref = ERR_PTR(-ENODEV); - else if (found > 1) - /* Success only when an unique zone is found */ - ref = ERR_PTR(-EEXIST); + if (!found) + return ERR_PTR(-ENODEV); + + /* Success only when one zone is found. */ + if (found > 1) + return ERR_PTR(-EEXIST); -exit: return ref; } EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name); @@ -1714,6 +1693,18 @@ static void thermal_zone_pm_prepare(stru tz->state |= TZ_STATE_FLAG_SUSPENDED; } +static void thermal_pm_notify_prepare(void) +{ + struct thermal_zone_device *tz; + + guard(mutex)(&thermal_list_lock); + + thermal_pm_suspended = true; + + list_for_each_entry(tz, &thermal_tz_list, node) + thermal_zone_pm_prepare(tz); +} + static void thermal_zone_pm_complete(struct thermal_zone_device *tz) { guard(thermal_zone)(tz); @@ -1732,35 +1723,31 @@ static void thermal_zone_pm_complete(str mod_delayed_work(system_freezable_power_efficient_wq, &tz->poll_queue, 0); } -static int thermal_pm_notify(struct notifier_block *nb, - unsigned long mode, void *_unused) +static void thermal_pm_notify_complete(void) { struct thermal_zone_device *tz; + guard(mutex)(&thermal_list_lock); + + thermal_pm_suspended = false; + + list_for_each_entry(tz, &thermal_tz_list, node) + thermal_zone_pm_complete(tz); +} + +static int thermal_pm_notify(struct notifier_block *nb, + unsigned long mode, void *_unused) +{ switch (mode) { case PM_HIBERNATION_PREPARE: case PM_RESTORE_PREPARE: case PM_SUSPEND_PREPARE: - mutex_lock(&thermal_list_lock); - - thermal_pm_suspended = true; - - list_for_each_entry(tz, &thermal_tz_list, node) - thermal_zone_pm_prepare(tz); - - mutex_unlock(&thermal_list_lock); + thermal_pm_notify_prepare(); break; case PM_POST_HIBERNATION: case PM_POST_RESTORE: case PM_POST_SUSPEND: - mutex_lock(&thermal_list_lock); - - thermal_pm_suspended = false; - - list_for_each_entry(tz, &thermal_tz_list, node) - thermal_zone_pm_complete(tz); - - mutex_unlock(&thermal_list_lock); + thermal_pm_notify_complete(); break; default: break; From patchwork Sat Sep 14 10:41:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 828777 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EDE6577115; Sat, 14 Sep 2024 10:58:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311490; cv=none; b=YnCZkg/BQeMCRLwrnHIucHV7cP6ayhnMTXG72R9GNhg4QoAYyb/WCi2qqcSWo1YX/sc6x9V0owgwHlNXINP5BlhIx6knbdPElSGnmceT3Ynhe5J5GdS7jAjLaFV1GGAH4J06dMHP+MHM612xJCy08BCINyshdH6XxBNNRP6j8T8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311490; c=relaxed/simple; bh=d6kU/oDJbmlVAoois5dft3LLP1DBvbyCs5QgRNeLxLo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HHAH/31lMxWP2zqbye/6w+MV6k2zplbE+42sVR/KNDEhkRP8zU8FhdR/yBn+iXghtBciPFBwpP0uS5aSRwL1Oomstp9v9I55g4kED2NsAls2XSQ8b4hdpTVgUquYtpujtRoK/ykSuRvQ4uE4FVAfKV+WeukFO1HlEyghl3SNpjw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=vl51TOjn reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="vl51TOjn" 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 6.2.0) id b2a62219cf34ebf7; Sat, 14 Sep 2024 12:58:05 +0200 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 6A62A8532AE; Sat, 14 Sep 2024 12:58:05 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311485; bh=d6kU/oDJbmlVAoois5dft3LLP1DBvbyCs5QgRNeLxLo=; h=From:Subject:Date; b=vl51TOjnvw5xUW8pIgbYl4KcgamVpjZpwDHtxYx/Zul8iY32SGr1lSBchb43JfPVN 8T2C+wrkIKJk8TPtLTKGhcCPfkjJS/xRHdeAz1YSPn4ReKPHMgoaY2YCOlnIGwl38z We70Y2Fq/oDatKaIpOgOOk0DzASG9mB2WJn33XRp+cqDlCMKA+yRZ0gJ/TVsOOsEKe KkdLPE1L6yFykZH0IvA8hgcXEsrtMdQm81NEtc26VXHH0nh5H3udGip8h4D1+j58ey Y4bQf26d+fuM0HUj/JFGJn20xtFxvw3dVzIfCqxmabFbbLpka+87Ml/xEAmIb52EN3 YUCd8zG+b2e+g== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 13/20] thermal: core: Call thermal_governor_update_tz() outside of cdev lock Date: Sat, 14 Sep 2024 12:41:54 +0200 Message-ID: <1921484.CQOukoFCf9@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeehucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=15 Fuz1=15 Fuz2=15 From: Rafael J. Wysocki Holding a cooling device lock around thermal_governor_update_tz() calls is not necessary and it may cause lockdep to complain if any governor's .update_tz() callback attempts to lock a cdev. For this reason, move the thermal_governor_update_tz() calls in thermal_bind_cdev_to_trip() and thermal_unbind_cdev_from_trip() from under the cdev lock. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -825,13 +825,13 @@ static int thermal_bind_cdev_to_trip(str if (!result) { list_add_tail(&dev->trip_node, &td->thermal_instances); list_add_tail(&dev->cdev_node, &cdev->thermal_instances); - - thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV); } mutex_unlock(&cdev->lock); - if (!result) + if (!result) { + thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV); return 0; + } device_remove_file(&tz->device, &dev->weight_attr); remove_trip_file: @@ -866,9 +866,6 @@ static void thermal_unbind_cdev_from_tri if (pos->cdev == cdev) { list_del(&pos->trip_node); list_del(&pos->cdev_node); - - thermal_governor_update_tz(tz, THERMAL_TZ_UNBIND_CDEV); - mutex_unlock(&cdev->lock); goto unbind; } @@ -878,6 +875,8 @@ static void thermal_unbind_cdev_from_tri return; unbind: + thermal_governor_update_tz(tz, THERMAL_TZ_UNBIND_CDEV); + device_remove_file(&tz->device, &pos->weight_attr); device_remove_file(&tz->device, &pos->attr); sysfs_remove_link(&tz->device.kobj, pos->name); From patchwork Sat Sep 14 10:43:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 829178 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E4885635; Sat, 14 Sep 2024 10:58:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311488; cv=none; b=qujEPOB78x6e7FXt9vUoaXoBRyPEJTE1GfRuDZ+qoEIuVTlwTuLZcslTKGlpw1/e66IDmu7NvIbPskAy0oCdbeZ9ja4CN4IrxWiu2a1SCi7YDNpS4cFsf4HCOP6gfsYRBEf9to5lACd69gveHhDFZKPqcu/cUnNx+X5mCiO8G0c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311488; c=relaxed/simple; bh=JZzx1172XcqWvR1UQZF0WI04VQXPhB3F9mKK19knqDE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KQtFpM7DGerAvSZcKlqmEn9vDGR1fxAa93cIPWGmPOv09HbGdRwLGWd8vMXDO1KaXyRnElXEjec5nrJDcCiXr0uhAqWebkrTxv7UUD8aH6XslhiE/NGIduj2bp5OtoarTFMI1AWswESYo+8fQFarlOE4XorAdtP4gx/FI6nUs28= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=peEt8jP8 reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="peEt8jP8" 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 6.2.0) id 6ed451219db4accd; Sat, 14 Sep 2024 12:58:05 +0200 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 78B498532AE; Sat, 14 Sep 2024 12:58:04 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311484; bh=JZzx1172XcqWvR1UQZF0WI04VQXPhB3F9mKK19knqDE=; h=From:Subject:Date; b=peEt8jP8CrAvxU39LOOYcnt5pegi3H6JK8Fue2hKUAo+qGMkT2pHeEqNDOtAh7ech nG4pemubZTVe3jOs3qpvagcwQK/Lk3t1qtefaQBZXiD/6g/ciDmmqNaPoYlV9adaC5 UCJALMT/8hJBInYq2/3ZM81cN6oUVWOH2PesinWWMThe1Lq6aPNWmixhsK3WxYtfnY kQ3s27oayWIbZH9eP1rfxOmNbgVSK+V1p660dhwDYanPqqfqJOC9A79q5r42SXIi8u Z2gSdGDlUXpcw5KhxHoxPYGDV3UL5Dlq2etQj0wksZ9H14SE4s4Wz5kwXajzZPDSMf 8EwE82bBxYF+Q== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 14/20] thermal: core: Introduce thermal_instance_add() Date: Sat, 14 Sep 2024 12:43:24 +0200 Message-ID: <2641944.Lt9SDvczpP@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeehucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=15 Fuz1=15 Fuz2=15 From: Rafael J. Wysocki To reduce the number of redundant result checks in thermal_bind_cdev_to_trip() and make the code in it easier to follow, move some of that code to a new function called thermal_instance_add() and make thermal_bind_cdev_to_trip() invoke that function. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 46 ++++++++++++++++++++++++++--------------- 1 file changed, 30 insertions(+), 16 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -736,6 +736,28 @@ struct thermal_zone_device *thermal_zone * binding, and unbinding. */ +static int thermal_instance_add(struct thermal_instance *new_instance, + struct thermal_cooling_device *cdev, + struct thermal_trip_desc *td) +{ + struct thermal_instance *instance; + + list_for_each_entry(instance, &td->thermal_instances, trip_node) { + if (instance->cdev == cdev) + return -EEXIST; + } + + list_add_tail(&new_instance->trip_node, &td->thermal_instances); + + mutex_lock(&cdev->lock); + + list_add_tail(&new_instance->cdev_node, &cdev->thermal_instances); + + mutex_unlock(&cdev->lock); + + return 0; +} + /** * thermal_bind_cdev_to_trip - bind a cooling device to a thermal zone * @tz: pointer to struct thermal_zone_device @@ -754,7 +776,7 @@ static int thermal_bind_cdev_to_trip(str struct thermal_cooling_device *cdev, struct cooling_spec *cool_spec) { - struct thermal_instance *dev, *instance; + struct thermal_instance *dev; bool upper_no_limit; int result; @@ -816,23 +838,15 @@ static int thermal_bind_cdev_to_trip(str if (result) goto remove_trip_file; - mutex_lock(&cdev->lock); - list_for_each_entry(instance, &td->thermal_instances, trip_node) - if (instance->cdev == cdev) { - result = -EEXIST; - break; - } - if (!result) { - list_add_tail(&dev->trip_node, &td->thermal_instances); - list_add_tail(&dev->cdev_node, &cdev->thermal_instances); - } - mutex_unlock(&cdev->lock); + result = thermal_instance_add(dev, cdev, td); + if (result) + goto remove_weight_file; - if (!result) { - thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV); - return 0; - } + thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV); + + return 0; +remove_weight_file: device_remove_file(&tz->device, &dev->weight_attr); remove_trip_file: device_remove_file(&tz->device, &dev->attr); From patchwork Sat Sep 14 10:44:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. 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Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 15/20] thermal: core: Introduce thermal_instance_delete() Date: Sat, 14 Sep 2024 12:44:45 +0200 Message-ID: <2224279.Mh6RI2rZIc@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgepfeenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=10 Fuz1=10 Fuz2=10 From: Rafael J. Wysocki It is not necessary to walk the thermal_instances list in a trip descriptor under a cooling device lock, so acquire that lock only for deleting the given thermal instance from the list of thermal instances in the given cdev. Moreover, in analogy with the previous change that introduced thermal_instance_add(), put the code deleting the given thermal instance from the lists it is on into a separate new function called thermal_instance_delete(). No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -859,6 +859,17 @@ free_mem: return result; } +static void thermal_instance_delete(struct thermal_instance *instance) +{ + list_del(&instance->trip_node); + + mutex_lock(&instance->cdev->lock); + + list_del(&instance->cdev_node); + + mutex_unlock(&instance->cdev->lock); +} + /** * thermal_unbind_cdev_from_trip - unbind a cooling device from a thermal zone. * @tz: pointer to a struct thermal_zone_device. @@ -875,16 +886,12 @@ static void thermal_unbind_cdev_from_tri { struct thermal_instance *pos, *next; - mutex_lock(&cdev->lock); list_for_each_entry_safe(pos, next, &td->thermal_instances, trip_node) { if (pos->cdev == cdev) { - list_del(&pos->trip_node); - list_del(&pos->cdev_node); - mutex_unlock(&cdev->lock); + thermal_instance_delete(pos); goto unbind; } } - mutex_unlock(&cdev->lock); return; From patchwork Sat Sep 14 10:45:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 828778 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C7D121CEAB0; Sat, 14 Sep 2024 10:54:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311273; cv=none; b=tDUR9ypMOd2NJKTgTzsefGRWomxkDsBHmLabbQePOFcqn/B/r1cCeWIFSC5Nqi3vDg/zKbfvyhTC8FLacsw6CQNAMpc/aZ6DgmhxOArBgopUEaW4NQJ0fy8NsPPJ2zhIBmkWjYR+Xda21hYV7VnX14r0QCysqiYOT81Sbgp7XYg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311273; c=relaxed/simple; bh=+5/i/yZAcna1+JjBtrENZEzQS9hTFvlTTLY7k+oP7nk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=MujU6n/ZU6qtUrvqDRPr3A2swKXWsxjnivkLD2v2RdrM5M7cEil79YcMKfLB6uVYCsSIK8iJgt5YEiwBgUxdi0R6Cltpq7WXActY2IVd5YJxVnG/IgL3OHX7ArtrFQjdeQ7Osdwaqql7RLjpZU2xrbUp7eYjVDv4gEF7TbdUisY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=yIMI02N3 reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="yIMI02N3" 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 6.2.0) id 9e5b3eb4689cc188; Sat, 14 Sep 2024 12:54:29 +0200 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 86EF9853357; Sat, 14 Sep 2024 12:54:28 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311269; bh=+5/i/yZAcna1+JjBtrENZEzQS9hTFvlTTLY7k+oP7nk=; h=From:Subject:Date; b=yIMI02N3aF2YxVa8MbruYqSng6s1fFN9IaFnkkGQa42AZR50Wxe4N4flymlfhudXL tPsOTm8/LZBX7qyn+uVRhL2sPBf6feMCrhEBK2AyAk6/RHhgmBGfc+Fk2DHe2AJfZl Sxq8e0NopLUxYUmpo1U7p83Sm3pxtU9c1YyS9e0iaEOkD8oFD9PeOaiXAfK3tF6SxN RYNJ2tYmuRyHmKIQpP+q2m8ZQoMy94WFMEx7Ie70lo5cPCt9ST2T5x3Wi/WW5wZd/Y 6LWY64wg7pmfZIfjWBccK4aGVDey+HhVqigOwOGdtH2mc3HCCZ7qIJPMr7Jh8TjB/A u0R70cFpfNmOg== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 16/20] thermal: core: Introduce thermal_cdev_update_nocheck() Date: Sat, 14 Sep 2024 12:45:57 +0200 Message-ID: <3791590.MHq7AAxBmi@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgepudenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=10 Fuz1=10 Fuz2=10 From: Rafael J. Wysocki Three thermal governors call __thermal_cdev_update() under the cdev lock without doing any checks, so in order to reduce the related code duplication, introduce a new helper function called thermal_cdev_update_nocheck() for them and make them use it. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/gov_bang_bang.c | 4 +--- drivers/thermal/gov_fair_share.c | 4 +--- drivers/thermal/gov_power_allocator.c | 5 ++--- drivers/thermal/thermal_core.h | 1 + drivers/thermal/thermal_helpers.c | 13 +++++++++++++ 5 files changed, 18 insertions(+), 9 deletions(-) Index: linux-pm/drivers/thermal/gov_bang_bang.c =================================================================== --- linux-pm.orig/drivers/thermal/gov_bang_bang.c +++ linux-pm/drivers/thermal/gov_bang_bang.c @@ -30,9 +30,7 @@ static void bang_bang_set_instance_targe dev_dbg(&instance->cdev->device, "target=%ld\n", instance->target); - mutex_lock(&instance->cdev->lock); - __thermal_cdev_update(instance->cdev); - mutex_unlock(&instance->cdev->lock); + thermal_cdev_update_nocheck(instance->cdev); } /** Index: linux-pm/drivers/thermal/gov_fair_share.c =================================================================== --- linux-pm.orig/drivers/thermal/gov_fair_share.c +++ linux-pm/drivers/thermal/gov_fair_share.c @@ -89,9 +89,7 @@ static void fair_share_throttle(struct t } instance->target = div_u64(dividend, divisor); - mutex_lock(&cdev->lock); - __thermal_cdev_update(cdev); - mutex_unlock(&cdev->lock); + thermal_cdev_update_nocheck(cdev); } } 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 @@ -317,9 +317,8 @@ power_actor_set_power(struct thermal_coo return ret; instance->target = clamp_val(state, instance->lower, instance->upper); - mutex_lock(&cdev->lock); - __thermal_cdev_update(cdev); - mutex_unlock(&cdev->lock); + + thermal_cdev_update_nocheck(cdev); return 0; } Index: linux-pm/drivers/thermal/thermal_core.h =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.h +++ linux-pm/drivers/thermal/thermal_core.h @@ -212,6 +212,7 @@ static inline bool cdev_is_power_actor(s } void thermal_cdev_update(struct thermal_cooling_device *); +void thermal_cdev_update_nocheck(struct thermal_cooling_device *cdev); void __thermal_cdev_update(struct thermal_cooling_device *cdev); int get_tz_trend(struct thermal_zone_device *tz, const struct thermal_trip *trip); Index: linux-pm/drivers/thermal/thermal_helpers.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_helpers.c +++ linux-pm/drivers/thermal/thermal_helpers.c @@ -206,6 +206,19 @@ void thermal_cdev_update(struct thermal_ } /** + * thermal_cdev_update_nocheck() - Unconditionally update cooling device state + * @cdev: Target cooling device. + */ +void thermal_cdev_update_nocheck(struct thermal_cooling_device *cdev) +{ + mutex_lock(&cdev->lock); + + __thermal_cdev_update(cdev); + + mutex_unlock(&cdev->lock); +} + +/** * thermal_zone_get_slope - return the slope attribute of the thermal zone * @tz: thermal zone device with the slope attribute * From patchwork Sat Sep 14 10:47:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 828779 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DDE8D149C4A; Sat, 14 Sep 2024 10:51:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311065; cv=none; b=aHgRhupmXmmw4lzqGL5Ca5ix1ROBNEn2M53FdIdFd+uBijLLeoLE+Heu8tg2mgy1ZhLjilpr/uRTnPyqgEgWkqC/EwAo3eUvBrT7iPZYI+cvT4w1PsAVwZkjKSo0ZxOqBszS+is6Mgwr6LYbtQBeRFyth7qEevvpyylHhBNTujg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311065; c=relaxed/simple; bh=v0QrYE3ZmBl/HSfh4WxfjE45E3R3d00cYJ0JGbnpgZM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=EjM5y3UoJMqPWvQ7KxIZ3PKxp5e4DZG/j7W/JJIXY3JjtioRKorZxa38SEoaNzy/fFEzE/+wf0cT6pahU+w0qIg5JB0fppldHuz+tPQl8nMbVtGtZK10fBRjFR5OwEf5ybJpS4DbCbpagQjCWt83kSxsw6OUA/AtAyuBHYfMBFo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=VFx3cygI reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="VFx3cygI" 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 6.2.0) id e2eb2ee9d723a393; Sat, 14 Sep 2024 12:50:55 +0200 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 1BC748532AE; Sat, 14 Sep 2024 12:50:55 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311055; bh=v0QrYE3ZmBl/HSfh4WxfjE45E3R3d00cYJ0JGbnpgZM=; h=From:Subject:Date; b=VFx3cygI1/t+5q0C/vcZ+PbhaZLa3EI0aUQ13hhrl3QzQBhWV3GnrBPgJvSdoWWEX 3Bd1pAPD+2NlxKi0Nh65FctFatVQI1pOYaMxZBofKoI4WhRR4wFwrJH4CM0FsXVqZQ S4+K4xorEbMvxp0K4io7ud2GFqwhXjWCCLNFVFDDPTWu92Jjfnr3quS+Pe7+ugqOJN 5X/nvoEIN8jZo0nxO6mqy4IbG4L4IWntBIp2QDEH/Z4Po/yYfPKRIoQ8FISfjFL4CC zdNREg3+sNwfEmO9YU2FEVp1ilooiXCEB+fW56k1ZvMjS4sK+xDREIxQOe8Qy0XhiJ 9eFhAnPQilzQA== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 17/20] thermal: core: Add and use cooling device guard Date: Sat, 14 Sep 2024 12:47:16 +0200 Message-ID: <1890654.atdPhlSkOF@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=5 Fuz1=5 Fuz2=5 From: Rafael J. Wysocki Add and use a special guard for cooling devices. This allows quite a few error code paths to be simplified among other things and brings in code size reduction for a good measure. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/gov_power_allocator.c | 21 +++++++++---------- drivers/thermal/gov_step_wise.c | 6 ++--- drivers/thermal/thermal_core.c | 17 ++++----------- drivers/thermal/thermal_debugfs.c | 25 +++++++++++++--------- drivers/thermal/thermal_helpers.c | 19 ++++------------- drivers/thermal/thermal_sysfs.c | 37 ++++++++++------------------------ include/linux/thermal.h | 3 ++ 7 files changed, 52 insertions(+), 76 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -749,12 +749,10 @@ static int thermal_instance_add(struct t list_add_tail(&new_instance->trip_node, &td->thermal_instances); - mutex_lock(&cdev->lock); + guard(cooling_dev)(cdev); list_add_tail(&new_instance->cdev_node, &cdev->thermal_instances); - mutex_unlock(&cdev->lock); - return 0; } @@ -863,11 +861,9 @@ static void thermal_instance_delete(stru { list_del(&instance->trip_node); - mutex_lock(&instance->cdev->lock); + guard(cooling_dev)(instance->cdev); list_del(&instance->cdev_node); - - mutex_unlock(&instance->cdev->lock); } /** @@ -1230,10 +1226,10 @@ void thermal_cooling_device_update(struc * Update under the cdev lock to prevent the state from being set beyond * the new limit concurrently. */ - mutex_lock(&cdev->lock); + guard(cooling_dev)(cdev); if (cdev->ops->get_max_state(cdev, &cdev->max_state)) - goto unlock; + return; thermal_cooling_device_stats_reinit(cdev); @@ -1260,12 +1256,9 @@ void thermal_cooling_device_update(struc } if (cdev->ops->get_cur_state(cdev, &state) || state > cdev->max_state) - goto unlock; + return; thermal_cooling_device_stats_update(cdev, state); - -unlock: - mutex_unlock(&cdev->lock); } EXPORT_SYMBOL_GPL(thermal_cooling_device_update); Index: linux-pm/include/linux/thermal.h =================================================================== --- linux-pm.orig/include/linux/thermal.h +++ linux-pm/include/linux/thermal.h @@ -137,6 +137,9 @@ struct thermal_cooling_device { #endif }; +DEFINE_GUARD(cooling_dev, struct thermal_cooling_device *, mutex_lock(&_T->lock), + mutex_unlock(&_T->lock)) + /* Structure to define Thermal Zone parameters */ struct thermal_zone_params { const char *governor_name; Index: linux-pm/drivers/thermal/thermal_sysfs.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_sysfs.c +++ linux-pm/drivers/thermal/thermal_sysfs.c @@ -544,13 +544,12 @@ cur_state_store(struct device *dev, stru if (state > cdev->max_state) return -EINVAL; - mutex_lock(&cdev->lock); + guard(cooling_dev)(cdev); result = cdev->ops->set_cur_state(cdev, state); if (!result) thermal_cooling_device_stats_update(cdev, state); - mutex_unlock(&cdev->lock); return result ? result : count; } @@ -625,21 +624,18 @@ static ssize_t total_trans_show(struct d { struct thermal_cooling_device *cdev = to_cooling_device(dev); struct cooling_dev_stats *stats; - int ret = 0; + int ret; - mutex_lock(&cdev->lock); + guard(cooling_dev)(cdev); stats = cdev->stats; if (!stats) - goto unlock; + return 0; spin_lock(&stats->lock); ret = sprintf(buf, "%u\n", stats->total_trans); spin_unlock(&stats->lock); -unlock: - mutex_unlock(&cdev->lock); - return ret; } @@ -652,11 +648,11 @@ time_in_state_ms_show(struct device *dev ssize_t len = 0; int i; - mutex_lock(&cdev->lock); + guard(cooling_dev)(cdev); stats = cdev->stats; if (!stats) - goto unlock; + return 0; spin_lock(&stats->lock); @@ -668,9 +664,6 @@ time_in_state_ms_show(struct device *dev } spin_unlock(&stats->lock); -unlock: - mutex_unlock(&cdev->lock); - return len; } @@ -682,11 +675,11 @@ reset_store(struct device *dev, struct d struct cooling_dev_stats *stats; int i, states; - mutex_lock(&cdev->lock); + guard(cooling_dev)(cdev); stats = cdev->stats; if (!stats) - goto unlock; + return count; states = cdev->max_state + 1; @@ -702,9 +695,6 @@ reset_store(struct device *dev, struct d spin_unlock(&stats->lock); -unlock: - mutex_unlock(&cdev->lock); - return count; } @@ -716,13 +706,11 @@ static ssize_t trans_table_show(struct d ssize_t len = 0; int i, j; - mutex_lock(&cdev->lock); + guard(cooling_dev)(cdev); stats = cdev->stats; - if (!stats) { - len = -ENODATA; - goto unlock; - } + if (!stats) + return -ENODATA; len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); len += snprintf(buf + len, PAGE_SIZE - len, " : "); @@ -760,9 +748,6 @@ static ssize_t trans_table_show(struct d len = -EFBIG; } -unlock: - mutex_unlock(&cdev->lock); - return len; } Index: linux-pm/drivers/thermal/thermal_helpers.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_helpers.c +++ linux-pm/drivers/thermal/thermal_helpers.c @@ -58,17 +58,10 @@ bool thermal_trip_is_bound_to_cdev(struc const struct thermal_trip *trip, struct thermal_cooling_device *cdev) { - bool ret; - guard(thermal_zone)(tz); + guard(cooling_dev)(cdev); - mutex_lock(&cdev->lock); - - ret = thermal_instance_present(tz, cdev, trip); - - mutex_unlock(&cdev->lock); - - return ret; + return thermal_instance_present(tz, cdev, trip); } EXPORT_SYMBOL_GPL(thermal_trip_is_bound_to_cdev); @@ -197,12 +190,12 @@ void __thermal_cdev_update(struct therma */ void thermal_cdev_update(struct thermal_cooling_device *cdev) { - mutex_lock(&cdev->lock); + guard(cooling_dev)(cdev); + if (!cdev->updated) { __thermal_cdev_update(cdev); cdev->updated = true; } - mutex_unlock(&cdev->lock); } /** @@ -211,11 +204,9 @@ void thermal_cdev_update(struct thermal_ */ void thermal_cdev_update_nocheck(struct thermal_cooling_device *cdev) { - mutex_lock(&cdev->lock); + guard(cooling_dev)(cdev); __thermal_cdev_update(cdev); - - mutex_unlock(&cdev->lock); } /** Index: linux-pm/drivers/thermal/thermal_debugfs.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_debugfs.c +++ linux-pm/drivers/thermal/thermal_debugfs.c @@ -516,6 +516,19 @@ void thermal_debug_cdev_add(struct therm cdev->debugfs = thermal_dbg; } +static struct thermal_debugfs *thermal_debug_cdev_clear(struct thermal_cooling_device *cdev) +{ + struct thermal_debugfs *thermal_dbg; + + guard(cooling_dev)(cdev); + + thermal_dbg = cdev->debugfs; + if (thermal_dbg) + cdev->debugfs = NULL; + + return thermal_dbg; +} + /** * thermal_debug_cdev_remove - Remove a cooling device debugfs entry * @@ -527,17 +540,9 @@ void thermal_debug_cdev_remove(struct th { struct thermal_debugfs *thermal_dbg; - mutex_lock(&cdev->lock); - - thermal_dbg = cdev->debugfs; - if (!thermal_dbg) { - mutex_unlock(&cdev->lock); + thermal_dbg = thermal_debug_cdev_clear(cdev); + if (!thermal_dbg) return; - } - - cdev->debugfs = NULL; - - mutex_unlock(&cdev->lock); mutex_lock(&thermal_dbg->lock); 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 @@ -544,18 +544,17 @@ static void allow_maximum_power(struct t cdev = instance->cdev; instance->target = 0; - mutex_lock(&cdev->lock); - /* - * Call for updating the cooling devices local stats and avoid - * periods of dozen of seconds when those have not been - * maintained. - */ - cdev->ops->get_requested_power(cdev, &req_power); + scoped_guard(cooling_dev, cdev) { + /* + * Call for updating the cooling devices local stats and + * avoid periods of dozen of seconds when those have not + * been maintained. + */ + cdev->ops->get_requested_power(cdev, &req_power); - if (params->update_cdevs) - __thermal_cdev_update(cdev); - - mutex_unlock(&cdev->lock); + if (params->update_cdevs) + __thermal_cdev_update(cdev); + } } } Index: linux-pm/drivers/thermal/gov_step_wise.c =================================================================== --- linux-pm.orig/drivers/thermal/gov_step_wise.c +++ linux-pm/drivers/thermal/gov_step_wise.c @@ -97,9 +97,9 @@ static void thermal_zone_trip_update(str instance->initialized = true; - mutex_lock(&instance->cdev->lock); - instance->cdev->updated = false; /* cdev needs update */ - mutex_unlock(&instance->cdev->lock); + scoped_guard(cooling_dev, instance->cdev) { + instance->cdev->updated = false; /* cdev needs update */ + } } } From patchwork Sat Sep 14 10:48:22 2024 Content-Type: text/plain; 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Wysocki" X-Patchwork-Id: 829180 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7968D635; Sat, 14 Sep 2024 10:51:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311066; cv=none; b=r+FwDi4L7u2Z65QwMATYyNR2bd4kVufiONWzqBqF3Rcc8OKQXfo5eAhy5oz6P7Ef3ZS09TYzWiohKEVDsegMfzDDEsKnWjwnM1dB1N8hj3uWV7OdeJ1iuHBh7LBoeXofzKiXUWicda1pOYpgr0n3WXuaHI8VJO6K32tY1hP6i90= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311066; c=relaxed/simple; bh=cDtItHbdNGnN9iqgNK0L4DgeyKSEtRo50VDSA5j1JO4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=SkLvJKkK/R+UqW6KASBBtUGLai8Yc2IhA/3ktT8vLtOc2OUxVDAjFgsRcT1e+Q9ixaTFfO39bxRDpZdAmY8vF3Yet5snpyZEff+0dBNNiMRFIDaRRtB4fXdnMLahCQry65fbh1Pdy2OVQvzklYNfkNLYYmhbPLSsTmct2ILZB9w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=BunJqhg7 reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="BunJqhg7" 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 6.2.0) id 35d387eeb166edd4; Sat, 14 Sep 2024 12:50:54 +0200 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 0FC178532AE; Sat, 14 Sep 2024 12:50:54 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311054; bh=cDtItHbdNGnN9iqgNK0L4DgeyKSEtRo50VDSA5j1JO4=; h=From:Subject:Date; b=BunJqhg7Jj9W996RPxTobbMZRfdeuWWbejTd4TRNdULLdp8qEBkMGg+/WBcvx2vJR iho5Ue+zadrqVRrzpSUgA+Fj0K7v8FR0FDrmdDUJcsmHcAASit948DFPy8dSIL3ILW TjLJ3TyD5K4ZSOXIb/hL/mVf3MfvEnmrPek3ZZ9cwxNCNnkLblpzE8JyfAFpl3B45N 3KVhUbz38n/c38MYaUAtPr5auTw0kUrz2bB9hw/Oad5NMNzlL+z9vSzR13EbYGc1Sa YfVNkN6ZbSg1yBJv195Z0mojJ8AH5l40h/WmzE3i8CPB7NMTnleHmR9ELGJV+Ljrxl d41/aZ+lPsvbw== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 18/20] thermal: core: Call __thermal_cdev_update() on cdev unbind Date: Sat, 14 Sep 2024 12:48:22 +0200 Message-ID: <2227092.Icojqenx9y@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=5 Fuz1=5 Fuz2=5 From: Rafael J. Wysocki When deleting a thermal instance from a cooling device's list of thermal instances, update it in case its state has been determined by the thermal instance going away. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 6 ++++++ 1 file changed, 6 insertions(+) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -864,6 +864,12 @@ static void thermal_instance_delete(stru guard(cooling_dev)(instance->cdev); list_del(&instance->cdev_node); + + /* + * Update the cdev in case its state has been determined by the thermal + * instance going away. + */ + __thermal_cdev_update(instance->cdev); } /** From patchwork Sat Sep 14 10:49:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 829181 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 796CB2BB09; Sat, 14 Sep 2024 10:51:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311064; cv=none; b=jeXOkaeg0ao1v0UElqW98ghXeE4Awg8TCMIZiClu8o+svllMjAlSN2Qibimw+fo/9T2ysJZYmnmnXk25VdoOV1HQigLZGensP/qJ80eQONGxakk/NJ7mKFwYQO8OesdRDUHAixb9ILKqi0KF95QJ1T47XBEl/OYJJJ2cRgAi3B0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311064; c=relaxed/simple; bh=mkycwVK0EqE+tg/RGLbOtF4efoV6gUkcxA6iWq166NE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=M+KUwPTx4eoaTJdYuSIPMff6w0+d4fE7i9OTZ8BR0YOOS5PBBpblME688KBfpZt/TEwTNfFSF3IVOsjfKQhdqbMsgl25SYXTvaf8TNenGsMxhKTqHbsLA7X1qUZh16Cu3lHF5vk+2cjAoYB3Nv93lKnSObqSzqZpT53AB6eLUro= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=BMtcHzQi reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="BMtcHzQi" 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 6.2.0) id c4b8d7d304967b42; Sat, 14 Sep 2024 12:50:53 +0200 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 3FC0E8532AE; Sat, 14 Sep 2024 12:50:53 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311053; bh=mkycwVK0EqE+tg/RGLbOtF4efoV6gUkcxA6iWq166NE=; h=From:Subject:Date; b=BMtcHzQi27HxFB4ZS9f55MPnMMc3/si0ttKknjw6iZkVU3Rf4O4g56oyT8pleAfq4 sRFpjqIDx+t942KJ1nlFSAVd8lm5CCbLSJrhhoZ2aCadCxzUFGqiy/uQ/JNtRbVzUp 9ZMjnX4DZNe5s7NhuO+egs/D3v75f6BnQy3nSjK1TJLtwA6YMxkQ1fKcOcq+yM91RK 9VE31TSzqPLoc/gKb39HUwJww1W+Y73Nkm1VfMu4oC2NNJhPnJ6oA0LnkeT1Tk6vRh Sdj7dmkuBdtT4KfyaZzcIkvdRfkvQkIodbgO717xowrMOHvO8WWQC5jczWCChRW25h bZLPM+uo53cxg== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 19/20] thermal: core: Separate thermal zone governor initialization Date: Sat, 14 Sep 2024 12:49:17 +0200 Message-ID: <2495577.jE0xQCEvom@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=5 Fuz1=5 Fuz2=5 From: Rafael J. Wysocki In preparation for a subsequent change that will switch over the thermal core to using a mutex guard for managing thermal_governor_lock, move the code running in thermal_zone_device_register_with_trips() under that lock into a separate function called thermal_zone_init_governor(). While at it, drop a useless comment. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 36 +++++++++++++++++++++--------------- 1 file changed, 21 insertions(+), 15 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -1342,6 +1342,25 @@ int thermal_zone_get_crit_temp(struct th } EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp); +static int thermal_zone_init_governor(struct thermal_zone_device *tz) +{ + struct thermal_governor *governor; + int ret; + + mutex_lock(&thermal_governor_lock); + + if (tz->tzp) + governor = __find_governor(tz->tzp->governor_name); + else + governor = def_governor; + + ret = thermal_set_governor(tz, governor); + + mutex_unlock(&thermal_governor_lock); + + return ret; +} + static void thermal_zone_init_complete(struct thermal_zone_device *tz) { struct thermal_cooling_device *cdev; @@ -1406,7 +1425,6 @@ thermal_zone_device_register_with_trips( struct thermal_trip_desc *td; int id; int result; - struct thermal_governor *governor; if (!type || strlen(type) == 0) { pr_err("No thermal zone type defined\n"); @@ -1502,21 +1520,9 @@ thermal_zone_device_register_with_trips( if (result) goto release_device; - /* Update 'this' zone's governor information */ - mutex_lock(&thermal_governor_lock); - - if (tz->tzp) - governor = __find_governor(tz->tzp->governor_name); - else - governor = def_governor; - - result = thermal_set_governor(tz, governor); - if (result) { - mutex_unlock(&thermal_governor_lock); + result = thermal_zone_init_governor(tz); + if (result) goto unregister; - } - - mutex_unlock(&thermal_governor_lock); if (!tz->tzp || !tz->tzp->no_hwmon) { result = thermal_add_hwmon_sysfs(tz); From patchwork Sat Sep 14 10:50:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 828780 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A756138C; Sat, 14 Sep 2024 10:51:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311064; cv=none; b=oOshnNDQPzPebC2GStexCdlXHReirc6GQLULqzftCaLlKLkN2ADSnY0wBc9vl9+oT9KVuUAkAnmpkXYe/V5Z6y85ResxsuJmpsTLy0dimLZ/9Ppult8bGvdSEza8a48XGqjn5KJx050jVs92Uh8gMYD2cjVt4bXOVQAe1GEYqtY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726311064; c=relaxed/simple; bh=OoicNfJK50cTdvLntxjnZVynjZjfdbu7WKyioFwc1YY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=h0EdVtLxN5VXo3qAT+DVONLbYnXDojoWk3HnvX4kIiJHeYqKgHitemLHhLWvD+FaT8rz2GxKATki3xbs5zi9y2VWSz/0Ns+1VbdCngvFqDPQ7EiEtikedlm9+1zM2t5YXa3OtgbWd6rUqHwfcY3rTH4jHGAj+zDKlbum8gd1/PU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=fail (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=nQBRqUDX reason="signature verification failed"; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="nQBRqUDX" 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 6.2.0) id d0e4e7f6a0323e80; Sat, 14 Sep 2024 12:50:52 +0200 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 6A2238532AE; Sat, 14 Sep 2024 12:50:52 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1726311052; bh=OoicNfJK50cTdvLntxjnZVynjZjfdbu7WKyioFwc1YY=; h=From:Subject:Date; b=nQBRqUDXby/UJVHDHPlUsiVabT3PqnYQmzWWoXXdgOXXFEY8afGF/OJq9S5ffviM4 /fjQE5xk+bHkL8woYfA+nL6gLmOxXFeIUxgHdg2E9ydvywx3EwDVW+hI2vIewJPXDT kp+AlR8gSyhnHUvZFo+t92uPxOF9IW35DnYwZn4wvs7rWrKUzoj0hM9626XUR26q6Y GDIp/ie2WGcQcc4xAggsznoTDmTj8si23V9MZ/E6+2UASjRIu1c66/Y1w4JnYo3cdj kochoi3d4QSQbPPKGPiiEXViI6rmRP5BVFGDW+dqc6EwDAfZCltiRIu/gl+Y0zhfOQ R8dkH0yDO3Z/Q== From: "Rafael J. Wysocki" To: Linux PM Cc: LKML , Daniel Lezcano , Lukasz Luba , Zhang Rui Subject: [RFC PATCH for 6.13 v1 20/20] thermal: core: Manage thermal_governor_lock using a mutex guard Date: Sat, 14 Sep 2024 12:50:15 +0200 Message-ID: <863177860.0ifERbkFSE@rjwysocki.net> In-Reply-To: <6100907.lOV4Wx5bFT@rjwysocki.net> References: <6100907.lOV4Wx5bFT@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: spam:low X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeeftddrudektddgfeegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenogfuphgrmhfkphculdeftddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppeduleehrddufeeirdduledrleegnecuufhprghmkfhppeduleehrddufeeirdduledrleegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudelhedrudefiedrudelrdelgedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomheprhhjfiesrhhjfiihshhotghkihdrnhgvthdpnhgspghrtghpthhtohephedprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegurghnihgvlhdrlhgviigtrghnoheslhhinhgrrhhordhorhhgpdhrtghpthhtoheplhhukhgrshiirdhluhgsrgesrghrmhdrtghomhdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=5 Fuz1=5 Fuz2=5 From: Rafael J. Wysocki Switch over the thermal core to using a mutex guard for thermal_governor_lock management. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/thermal/thermal_core.c | 40 +++++++++++++--------------------------- 1 file changed, 13 insertions(+), 27 deletions(-) Index: linux-pm/drivers/thermal/thermal_core.c =================================================================== --- linux-pm.orig/drivers/thermal/thermal_core.c +++ linux-pm/drivers/thermal/thermal_core.c @@ -123,7 +123,7 @@ int thermal_register_governor(struct the if (!governor) return -EINVAL; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); err = -EBUSY; if (!__find_governor(governor->name)) { @@ -162,8 +162,6 @@ int thermal_register_governor(struct the } } - mutex_unlock(&thermal_governor_lock); - return err; } @@ -174,10 +172,10 @@ void thermal_unregister_governor(struct if (!governor) return; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); if (!__find_governor(governor->name)) - goto exit; + return; list_del(&governor->governor_list); @@ -188,9 +186,6 @@ void thermal_unregister_governor(struct THERMAL_NAME_LENGTH)) thermal_set_governor(pos, NULL); } - -exit: - mutex_unlock(&thermal_governor_lock); } int thermal_zone_device_set_policy(struct thermal_zone_device *tz, @@ -199,16 +194,13 @@ int thermal_zone_device_set_policy(struc struct thermal_governor *gov; int ret = -EINVAL; - mutex_lock(&thermal_governor_lock); - + guard(mutex)(&thermal_governor_lock); guard(thermal_zone)(tz); gov = __find_governor(strim(policy)); if (gov) ret = thermal_set_governor(tz, gov); - mutex_unlock(&thermal_governor_lock); - thermal_notify_tz_gov_change(tz, policy); return ret; @@ -219,15 +211,13 @@ int thermal_build_list_of_policies(char struct thermal_governor *pos; ssize_t count = 0; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); list_for_each_entry(pos, &thermal_governor_list, governor_list) { count += sysfs_emit_at(buf, count, "%s ", pos->name); } count += sysfs_emit_at(buf, count, "\n"); - mutex_unlock(&thermal_governor_lock); - return count; } @@ -663,17 +653,18 @@ int for_each_thermal_governor(int (*cb)( void *data) { struct thermal_governor *gov; - int ret = 0; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); + list_for_each_entry(gov, &thermal_governor_list, governor_list) { + int ret; + ret = cb(gov, data); if (ret) - break; + return ret; } - mutex_unlock(&thermal_governor_lock); - return ret; + return 0; } int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *, @@ -1345,20 +1336,15 @@ EXPORT_SYMBOL_GPL(thermal_zone_get_crit_ static int thermal_zone_init_governor(struct thermal_zone_device *tz) { struct thermal_governor *governor; - int ret; - mutex_lock(&thermal_governor_lock); + guard(mutex)(&thermal_governor_lock); if (tz->tzp) governor = __find_governor(tz->tzp->governor_name); else governor = def_governor; - ret = thermal_set_governor(tz, governor); - - mutex_unlock(&thermal_governor_lock); - - return ret; + return thermal_set_governor(tz, governor); } static void thermal_zone_init_complete(struct thermal_zone_device *tz)