From patchwork Fri Aug 5 15:38:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Lezcano X-Patchwork-Id: 12937409 X-Patchwork-Delegate: daniel.lezcano@linaro.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 48DB1C00140 for ; Fri, 5 Aug 2022 15:38:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240504AbiHEPiw (ORCPT ); Fri, 5 Aug 2022 11:38:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42228 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232065AbiHEPiu (ORCPT ); Fri, 5 Aug 2022 11:38:50 -0400 Received: from mail-wm1-x32f.google.com (mail-wm1-x32f.google.com [IPv6:2a00:1450:4864:20::32f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4FCC5237F7 for ; Fri, 5 Aug 2022 08:38:49 -0700 (PDT) Received: by mail-wm1-x32f.google.com with SMTP id v5so1608651wmj.0 for ; Fri, 05 Aug 2022 08:38:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc; bh=N6F1KWOnquRUouMVh2G6/70txn8l+RtXgOaeM52+cMU=; b=V2XfY7982nfVB9EPf9DcG6vgZp5KQoMpU91mPaqcS+EgJmGv7BXdpdU7PvOWsrQMZu Duf0uuqVQpOprvC+RUl+/z9hvlsZty5RyaOL+gQjIynYhJqrArH/Hb3DF+Jh1BhkR72I 5dvJtxs0Xxo74w9qAB2iymM1uf/j5cB6xTLMziat5Ms+WEezdOamVqro1v3dT4Zgtxei qBUBVXxbZ1uY6o4/ONmlO8nEp9aVnhKmLDAebff3K2gswoALA6+HihaBF85aTkehxU0y rRufOHKpU/p8LN23eFpbxVeJcMpAQiHLGFdfTKRN6ohtjHsaxfWJEtyoP6jiVxbaeKPg EqEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=N6F1KWOnquRUouMVh2G6/70txn8l+RtXgOaeM52+cMU=; b=amwNK2fn6WUUtt/I+wjwWNEMXg6HLSjIT9Pw0Ga8c0kijc/JCcgSUsJMjnSDvjzJgo bYAVv88k7T28iDhdU0I0iFvRpDTdayFGy1DFPkkSD+GmzX43te3otkkBfXkIpIDdizY3 9PUR316n47PMP+Yw/tDv9dJKc7Kjts/0PSdS4UZSY0hLA0fs8KtvjQH7WFJGlGXMZ55V Xt2VuxYEFZ58MjDhn8i7y4yk2hjTa3S0aKFVUzFHQgNuJwl+UfUbSggo+GU6zLMdjJv2 dPAXgeN/79hkrZtKV79p7TIHBZw8YemTdVizf6i2OGWkjlqBP/s7cCfCZNTKogFWzPG6 BM6w== X-Gm-Message-State: ACgBeo0RKWdlRJr9x5TRWrieJlMsAYVfNYnZgRzt2f+5Bd4wfT0HUCxd 7e+RRuRmrrDu1LRgVIntJyrEHQ== X-Google-Smtp-Source: AA6agR7UD70typjSKOyMwB0tdF6biWcDynYwwuQQGpaeIGKp9oaEzgOTLqU7sBujDYIh1O48hFSdxA== X-Received: by 2002:a05:600c:a146:b0:3a3:1e79:4446 with SMTP id ib6-20020a05600ca14600b003a31e794446mr5193441wmb.158.1659713927788; Fri, 05 Aug 2022 08:38:47 -0700 (PDT) Received: from mai.box.freepro.com ([2a05:6e02:1041:c10:aef0:8606:da6b:79ef]) by smtp.gmail.com with ESMTPSA id h14-20020a5d430e000000b002217540b222sm1721025wrq.58.2022.08.05.08.38.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Aug 2022 08:38:47 -0700 (PDT) From: Daniel Lezcano To: daniel.lezcano@linaro.org, rafael@kernel.org Cc: rui.zhang@intel.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Amit Kucheria , Lukasz Luba Subject: [PATCH 3/5] thermal/governors: Group the thermal zone lock inside the throttle function Date: Fri, 5 Aug 2022 17:38:32 +0200 Message-Id: <20220805153834.2510142-3-daniel.lezcano@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220805153834.2510142-1-daniel.lezcano@linaro.org> References: <20220805153834.2510142-1-daniel.lezcano@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The thermal zone lock is taken in the different places in the throttling path. At the first glance it does not hurt to move them at the beginning and the end of the 'throttle' function. That will allow a consolidation of the lock in the next following changes. Signed-off-by: Daniel Lezcano --- drivers/thermal/gov_bang_bang.c | 8 ++----- drivers/thermal/gov_fair_share.c | 1 + drivers/thermal/gov_power_allocator.c | 34 ++++++++++++--------------- drivers/thermal/gov_step_wise.c | 8 ++----- 4 files changed, 20 insertions(+), 31 deletions(-) diff --git a/drivers/thermal/gov_bang_bang.c b/drivers/thermal/gov_bang_bang.c index 991a1c54296d..f0bff2e0475b 100644 --- a/drivers/thermal/gov_bang_bang.c +++ b/drivers/thermal/gov_bang_bang.c @@ -31,8 +31,6 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip) trip, trip_temp, tz->temperature, trip_hyst); - mutex_lock(&tz->lock); - list_for_each_entry(instance, &tz->thermal_instances, tz_node) { if (instance->trip != trip) continue; @@ -65,8 +63,6 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip) instance->cdev->updated = false; /* cdev needs update */ mutex_unlock(&instance->cdev->lock); } - - mutex_unlock(&tz->lock); } /** @@ -100,10 +96,10 @@ static int bang_bang_control(struct thermal_zone_device *tz, int trip) { struct thermal_instance *instance; - thermal_zone_trip_update(tz, trip); - mutex_lock(&tz->lock); + thermal_zone_trip_update(tz, trip); + list_for_each_entry(instance, &tz->thermal_instances, tz_node) thermal_cdev_update(instance->cdev); diff --git a/drivers/thermal/gov_fair_share.c b/drivers/thermal/gov_fair_share.c index 6a2abcfc648f..5d5ddd648cd2 100644 --- a/drivers/thermal/gov_fair_share.c +++ b/drivers/thermal/gov_fair_share.c @@ -113,6 +113,7 @@ static int fair_share_throttle(struct thermal_zone_device *tz, int trip) } mutex_unlock(&tz->lock); + return 0; } diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c index 1d5052470967..d3aca236e274 100644 --- a/drivers/thermal/gov_power_allocator.c +++ b/drivers/thermal/gov_power_allocator.c @@ -392,8 +392,6 @@ static int allocate_power(struct thermal_zone_device *tz, int i, num_actors, total_weight, ret = 0; int trip_max_desired_temperature = params->trip_max_desired_temperature; - mutex_lock(&tz->lock); - num_actors = 0; total_weight = 0; list_for_each_entry(instance, &tz->thermal_instances, tz_node) { @@ -404,10 +402,8 @@ static int allocate_power(struct thermal_zone_device *tz, } } - if (!num_actors) { - ret = -ENODEV; - goto unlock; - } + if (!num_actors) + return -ENODEV; /* * We need to allocate five arrays of the same size: @@ -421,10 +417,8 @@ static int allocate_power(struct thermal_zone_device *tz, BUILD_BUG_ON(sizeof(*req_power) != sizeof(*extra_actor_power)); BUILD_BUG_ON(sizeof(*req_power) != sizeof(*weighted_req_power)); req_power = kcalloc(num_actors * 5, sizeof(*req_power), GFP_KERNEL); - if (!req_power) { - ret = -ENOMEM; - goto unlock; - } + if (!req_power) + return -ENOMEM; max_power = &req_power[num_actors]; granted_power = &req_power[2 * num_actors]; @@ -496,8 +490,6 @@ static int allocate_power(struct thermal_zone_device *tz, control_temp - tz->temperature); kfree(req_power); -unlock: - mutex_unlock(&tz->lock); return ret; } @@ -576,7 +568,6 @@ static void allow_maximum_power(struct thermal_zone_device *tz, bool update) struct power_allocator_params *params = tz->governor_data; u32 req_power; - mutex_lock(&tz->lock); list_for_each_entry(instance, &tz->thermal_instances, tz_node) { struct thermal_cooling_device *cdev = instance->cdev; @@ -598,7 +589,6 @@ static void allow_maximum_power(struct thermal_zone_device *tz, bool update) mutex_unlock(&instance->cdev->lock); } - mutex_unlock(&tz->lock); } /** @@ -707,17 +697,19 @@ static void power_allocator_unbind(struct thermal_zone_device *tz) static int power_allocator_throttle(struct thermal_zone_device *tz, int trip) { - int ret; + int ret = 0; int switch_on_temp, control_temp; struct power_allocator_params *params = tz->governor_data; bool update; + mutex_lock(&tz->lock); + /* * We get called for every trip point but we only need to do * our calculations once */ if (trip != params->trip_max_desired_temperature) - return 0; + goto out; ret = tz->ops->get_trip_temp(tz, params->trip_switch_on, &switch_on_temp); @@ -726,7 +718,7 @@ static int power_allocator_throttle(struct thermal_zone_device *tz, int trip) tz->passive = 0; reset_pid_controller(params); allow_maximum_power(tz, update); - return 0; + goto out; } tz->passive = 1; @@ -737,10 +729,14 @@ static int power_allocator_throttle(struct thermal_zone_device *tz, int trip) dev_warn(&tz->device, "Failed to get the maximum desired temperature: %d\n", ret); - return ret; + goto out; } - return allocate_power(tz, control_temp); + ret = allocate_power(tz, control_temp); + + mutex_unlock(&tz->lock); +out: + return ret; } static struct thermal_governor thermal_gov_power_allocator = { diff --git a/drivers/thermal/gov_step_wise.c b/drivers/thermal/gov_step_wise.c index 9729b46d0258..597a0ebec7a4 100644 --- a/drivers/thermal/gov_step_wise.c +++ b/drivers/thermal/gov_step_wise.c @@ -117,8 +117,6 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip) dev_dbg(&tz->device, "Trip%d[type=%d,temp=%d]:trend=%d,throttle=%d\n", trip, trip_type, trip_temp, trend, throttle); - mutex_lock(&tz->lock); - list_for_each_entry(instance, &tz->thermal_instances, tz_node) { if (instance->trip != trip) continue; @@ -145,8 +143,6 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip) instance->cdev->updated = false; /* cdev needs update */ mutex_unlock(&instance->cdev->lock); } - - mutex_unlock(&tz->lock); } /** @@ -164,10 +160,10 @@ static int step_wise_throttle(struct thermal_zone_device *tz, int trip) { struct thermal_instance *instance; - thermal_zone_trip_update(tz, trip); - mutex_lock(&tz->lock); + thermal_zone_trip_update(tz, trip); + list_for_each_entry(instance, &tz->thermal_instances, tz_node) thermal_cdev_update(instance->cdev);