From patchwork Wed Nov 3 16:10:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Luba X-Patchwork-Id: 12601125 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6039C43217 for ; Wed, 3 Nov 2021 16:11:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B88E860F39 for ; Wed, 3 Nov 2021 16:11:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232756AbhKCQNi (ORCPT ); Wed, 3 Nov 2021 12:13:38 -0400 Received: from foss.arm.com ([217.140.110.172]:33040 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232926AbhKCQN2 (ORCPT ); Wed, 3 Nov 2021 12:13:28 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D1762ED1; Wed, 3 Nov 2021 09:10:51 -0700 (PDT) Received: from e123648.arm.com (unknown [10.57.26.226]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 703DF3F7D7; Wed, 3 Nov 2021 09:10:47 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, lukasz.luba@arm.com, sudeep.holla@arm.com, will@kernel.org, catalin.marinas@arm.com, linux@armlinux.org.uk, gregkh@linuxfoundation.org, rafael@kernel.org, viresh.kumar@linaro.org, amitk@kernel.org, daniel.lezcano@linaro.org, amit.kachhap@gmail.com, thara.gopinath@linaro.org, bjorn.andersson@linaro.org, agross@kernel.org Subject: [PATCH v3 3/5] cpufreq: qcom-cpufreq-hw: Update offline CPUs per-cpu thermal pressure Date: Wed, 3 Nov 2021 16:10:18 +0000 Message-Id: <20211103161020.26714-4-lukasz.luba@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211103161020.26714-1-lukasz.luba@arm.com> References: <20211103161020.26714-1-lukasz.luba@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The thermal pressure signal gives information to the scheduler about reduced CPU capacity due to thermal. It is based on a value stored in a per-cpu 'thermal_pressure' variable. The online CPUs will get the new value there, while the offline won't. Unfortunately, when the CPU is back online, the value read from per-cpu variable might be wrong (stale data). This might affect the scheduler decisions, since it sees the CPU capacity differently than what is actually available. Fix it by making sure that all online+offline CPUs would get the proper value in their per-cpu variable when there is throttling or throttling is removed. Fixes: 275157b367f479 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support") Reviewed-by: Thara Gopinath Signed-off-by: Lukasz Luba --- drivers/cpufreq/qcom-cpufreq-hw.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index a2be0df7e174..0138b2ec406d 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -304,7 +304,8 @@ static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) if (capacity > max_capacity) capacity = max_capacity; - arch_set_thermal_pressure(policy->cpus, max_capacity - capacity); + arch_set_thermal_pressure(policy->related_cpus, + max_capacity - capacity); /* * In the unlikely case policy is unregistered do not enable