From patchwork Mon Oct 19 14:05:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Luba X-Patchwork-Id: 286768 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 69ED5C43457 for ; Mon, 19 Oct 2020 14:06:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1ED0A222E7 for ; Mon, 19 Oct 2020 14:06:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729055AbgJSOG0 (ORCPT ); Mon, 19 Oct 2020 10:06:26 -0400 Received: from foss.arm.com ([217.140.110.172]:58310 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728557AbgJSOG0 (ORCPT ); Mon, 19 Oct 2020 10:06:26 -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 22469D6E; Mon, 19 Oct 2020 07:06:25 -0700 (PDT) Received: from e123648.arm.com (unknown [10.57.15.200]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 97A4A3F66E; Mon, 19 Oct 2020 07:06:20 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-doc@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: robh+dt@kernel.org, amitk@kernel.org, corbet@lwn.net, daniel.lezcano@linaro.org, lukasz.luba@arm.com, Dietmar.Eggemann@arm.com, morten.rasmussen@arm.com, qperret@google.com, dianders@chromium.org, mka@chromium.org, rnayak@codeaurora.org, rafael@kernel.org, sudeep.holla@arm.com, viresh.kumar@linaro.org, sboyd@kernel.org, nm@ti.com Subject: [PATCH v3 1/4] PM / EM: Add a flag indicating units of power values in Energy Model Date: Mon, 19 Oct 2020 15:05:58 +0100 Message-Id: <20201019140601.3047-2-lukasz.luba@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201019140601.3047-1-lukasz.luba@arm.com> References: <20201019140601.3047-1-lukasz.luba@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org There are different platforms and devices which might use different scale for the power values. Kernel sub-systems might need to check if all Energy Model (EM) devices are using the same scale. Address that issue and store the information inside EM for each device. Thanks to that they can be easily compared and proper action triggered. Suggested-by: Daniel Lezcano Signed-off-by: Lukasz Luba Reviewed-by: Quentin Perret --- drivers/cpufreq/scmi-cpufreq.c | 3 ++- drivers/opp/of.c | 2 +- include/linux/energy_model.h | 9 +++++++-- kernel/power/energy_model.c | 24 +++++++++++++++++++++++- 4 files changed, 33 insertions(+), 5 deletions(-) diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c index e855e8612a67..3714a4cd07fa 100644 --- a/drivers/cpufreq/scmi-cpufreq.c +++ b/drivers/cpufreq/scmi-cpufreq.c @@ -188,7 +188,8 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy) policy->fast_switch_possible = handle->perf_ops->fast_switch_possible(handle, cpu_dev); - em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, policy->cpus); + em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, policy->cpus, + false); return 0; diff --git a/drivers/opp/of.c b/drivers/opp/of.c index 874b58756220..9e1307061de5 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -1333,7 +1333,7 @@ int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus) goto failed; } - ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus); + ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus, true); if (ret) goto failed; diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index b67a51c574b9..2c31d79bb922 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -29,6 +29,8 @@ struct em_perf_state { * em_perf_domain - Performance domain * @table: List of performance states, in ascending order * @nr_perf_states: Number of performance states + * @milliwatts: Flag indicating the power values are in milli-Watts + * or some other scale. * @cpus: Cpumask covering the CPUs of the domain. It's here * for performance reasons to avoid potential cache * misses during energy calculations in the scheduler @@ -43,6 +45,7 @@ struct em_perf_state { struct em_perf_domain { struct em_perf_state *table; int nr_perf_states; + bool milliwatts; unsigned long cpus[]; }; @@ -79,7 +82,8 @@ struct em_data_callback { struct em_perf_domain *em_cpu_get(int cpu); struct em_perf_domain *em_pd_get(struct device *dev); int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, - struct em_data_callback *cb, cpumask_t *span); + struct em_data_callback *cb, cpumask_t *spani, + bool milliwatts); void em_dev_unregister_perf_domain(struct device *dev); /** @@ -186,7 +190,8 @@ struct em_data_callback {}; static inline int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, - struct em_data_callback *cb, cpumask_t *span) + struct em_data_callback *cb, cpumask_t *span, + bool milliwatts) { return -EINVAL; } diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index c1ff7fa030ab..efe2a595988e 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -52,6 +52,17 @@ static int em_debug_cpus_show(struct seq_file *s, void *unused) } DEFINE_SHOW_ATTRIBUTE(em_debug_cpus); +static int em_debug_units_show(struct seq_file *s, void *unused) +{ + struct em_perf_domain *pd = s->private; + char *units = pd->milliwatts ? "milliWatts" : "bogoWatts"; + + seq_printf(s, "%s\n", units); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(em_debug_units); + static void em_debug_create_pd(struct device *dev) { struct dentry *d; @@ -64,6 +75,8 @@ static void em_debug_create_pd(struct device *dev) debugfs_create_file("cpus", 0444, d, dev->em_pd->cpus, &em_debug_cpus_fops); + debugfs_create_file("units", 0444, d, dev->em_pd, &em_debug_units_fops); + /* Create a sub-directory for each performance state */ for (i = 0; i < dev->em_pd->nr_perf_states; i++) em_debug_create_ps(&dev->em_pd->table[i], d); @@ -250,17 +263,24 @@ EXPORT_SYMBOL_GPL(em_cpu_get); * @cpus : Pointer to cpumask_t, which in case of a CPU device is * obligatory. It can be taken from i.e. 'policy->cpus'. For other * type of devices this should be set to NULL. + * @milliwatts : Flag indicating that the power values are in milliWatts or + * in some other scale. It must be set properly. * * Create Energy Model tables for a performance domain using the callbacks * defined in cb. * + * The @milliwatts is important to set with correct value. Some kernel + * sub-systems might rely on this flag and check if all devices in the EM are + * using the same scale. + * * If multiple clients register the same performance domain, all but the first * registration will be ignored. * * Return 0 on success */ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, - struct em_data_callback *cb, cpumask_t *cpus) + struct em_data_callback *cb, cpumask_t *cpus, + bool milliwatts) { unsigned long cap, prev_cap = 0; int cpu, ret; @@ -313,6 +333,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, if (ret) goto unlock; + dev->em_pd->milliwatts = milliwatts; + em_debug_create_pd(dev); dev_info(dev, "EM: created perf domain\n");