From nobody Thu Nov 14 10:32:43 2024 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 251DFC433FE for ; Wed, 16 Mar 2022 23:52:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347382AbiCPXyM (ORCPT ); Wed, 16 Mar 2022 19:54:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353569AbiCPXyD (ORCPT ); Wed, 16 Mar 2022 19:54:03 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id DC0A31BE8A; Wed, 16 Mar 2022 16:52:45 -0700 (PDT) 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 A108F1476; Wed, 16 Mar 2022 16:52:45 -0700 (PDT) Received: from e123648.arm.com (unknown [10.57.19.225]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id BF9C83F766; Wed, 16 Mar 2022 16:52:42 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com, Pierre.Gondois@arm.com, ionela.voinescu@arm.com, viresh.kumar@linaro.org, rafael@kernel.org, daniel.lezcano@linaro.org, linux-pm@vger.kernel.org, mka@chromium.org, nm@ti.com, sboyd@kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, cristian.marussi@arm.com, sudeep.holla@arm.com, matthias.bgg@gmail.com Subject: [[PATCH 7/8] thermal: cooling: Check Energy Model type in cpufreq_cooling and devfreq_cooling Date: Wed, 16 Mar 2022 23:52:10 +0000 Message-Id: <20220316235211.29370-8-lukasz.luba@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220316235211.29370-1-lukasz.luba@arm.com> References: <20220316235211.29370-1-lukasz.luba@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The Energy Model can now be artificial, which means the power values are mathematically generated to leverage EAS while not expected to be on an uniform scale with other devices providing power information. If this EM type is in use, the thermal governor IPA should not be allowed to operate, since the relation between cooling devices is not properly defined. Thus, it might be possible that big GPU has lower power values than a Little CPU. To mitigate a misbehaviour of the thermal control algorithm, simply do not register the cooling device as IPA's power actor. Signed-off-by: Lukasz Luba --- drivers/thermal/cpufreq_cooling.c | 2 +- drivers/thermal/devfreq_cooling.c | 8 +++++--- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_co= oling.c index 0bfb8eebd126..b8151d95a806 100644 --- a/drivers/thermal/cpufreq_cooling.c +++ b/drivers/thermal/cpufreq_cooling.c @@ -328,7 +328,7 @@ static inline bool em_is_sane(struct cpufreq_cooling_de= vice *cpufreq_cdev, struct cpufreq_policy *policy; unsigned int nr_levels; =20 - if (!em) + if (!em || em_is_artificial(em)) return false; =20 policy =3D cpufreq_cdev->policy; diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_co= oling.c index 4310cb342a9f..b04dcbbf721a 100644 --- a/drivers/thermal/devfreq_cooling.c +++ b/drivers/thermal/devfreq_cooling.c @@ -358,6 +358,7 @@ of_devfreq_cooling_register_power(struct device_node *n= p, struct devfreq *df, struct thermal_cooling_device *cdev; struct device *dev =3D df->dev.parent; struct devfreq_cooling_device *dfc; + struct em_perf_domain *em; char *name; int err, num_opps; =20 @@ -367,8 +368,9 @@ of_devfreq_cooling_register_power(struct device_node *n= p, struct devfreq *df, =20 dfc->devfreq =3D df; =20 - dfc->em_pd =3D em_pd_get(dev); - if (dfc->em_pd) { + em =3D em_pd_get(dev); + if (em && !em_is_artificial(em)) { + dfc->em_pd =3D em; devfreq_cooling_ops.get_requested_power =3D devfreq_cooling_get_requested_power; devfreq_cooling_ops.state2power =3D devfreq_cooling_state2power; @@ -379,7 +381,7 @@ of_devfreq_cooling_register_power(struct device_node *n= p, struct devfreq *df, num_opps =3D em_pd_nr_perf_states(dfc->em_pd); } else { /* Backward compatibility for drivers which do not use IPA */ - dev_dbg(dev, "missing EM for cooling device\n"); + dev_dbg(dev, "missing proper EM for cooling device\n"); =20 num_opps =3D dev_pm_opp_get_opp_count(dev); =20 --=20 2.17.1