From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A1E13C49EA7 for ; Fri, 25 Jun 2021 15:26:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8007F6193F for ; Fri, 25 Jun 2021 15:26:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229915AbhFYP3I (ORCPT ); Fri, 25 Jun 2021 11:29:08 -0400 Received: from foss.arm.com ([217.140.110.172]:58660 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229445AbhFYP3H (ORCPT ); Fri, 25 Jun 2021 11:29:07 -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 399591396; Fri, 25 Jun 2021 08:26:46 -0700 (PDT) Received: from e123648.arm.com (unknown [10.57.7.232]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 0C50B3F694; Fri, 25 Jun 2021 08:26:42 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org Cc: Chris.Redpath@arm.com, lukasz.luba@arm.com, dietmar.eggemann@arm.com, morten.rasmussen@arm.com, qperret@google.com, linux-pm@vger.kernel.org, peterz@infradead.org, rjw@rjwysocki.net, viresh.kumar@linaro.org, vincent.guittot@linaro.org, mingo@redhat.com, juri.lelli@redhat.com, rostedt@goodmis.org, segall@google.com, mgorman@suse.de, bristot@redhat.com, CCj.Yeh@mediatek.com Subject: [PATCH 2/3] PM: EM: Make em_cpu_energy() able to return bigger values Date: Fri, 25 Jun 2021 16:26:02 +0100 Message-Id: <20210625152603.25960-3-lukasz.luba@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210625152603.25960-1-lukasz.luba@arm.com> References: <20210625152603.25960-1-lukasz.luba@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The Energy Model (EM) em_cpu_energy() is responsible for providing good estimation regarding CPUs energy. It contains proper data structures which are then used during calculation. The values stored in there are in milli-Watts precision (or in abstract scale) smaller that 0xffff, which use sufficient unsigned long even on 32-bit machines. There are scenarios where we would like to provide calculated estimations in a better precision and the values might be 1000 times bigger. This patch makes possible to use quite big values for also 32-bit machines. Signed-off-by: Lukasz Luba --- include/linux/energy_model.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index 3f221dbf5f95..2016f5a706e0 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -101,7 +101,7 @@ void em_dev_unregister_perf_domain(struct device *dev); * Return: the sum of the energy consumed by the CPUs of the domain assuming * a capacity state satisfying the max utilization of the domain. */ -static inline unsigned long em_cpu_energy(struct em_perf_domain *pd, +static inline u64 em_cpu_energy(struct em_perf_domain *pd, unsigned long max_util, unsigned long sum_util, unsigned long allowed_cpu_cap) { @@ -180,7 +180,7 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd, * pd_nrg = ------------------------ (4) * scale_cpu */ - return ps->cost * sum_util / scale_cpu; + return div_u64((u64)ps->cost * sum_util, scale_cpu); } /** @@ -217,7 +217,7 @@ static inline struct em_perf_domain *em_pd_get(struct device *dev) { return NULL; } -static inline unsigned long em_cpu_energy(struct em_perf_domain *pd, +static inline u64 em_cpu_energy(struct em_perf_domain *pd, unsigned long max_util, unsigned long sum_util, unsigned long allowed_cpu_cap) { -- 2.17.1