From patchwork Mon Dec 14 12:38:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ionela Voinescu X-Patchwork-Id: 11972069 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 4F091C4361B for ; Mon, 14 Dec 2020 12:40:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B28F206FC for ; Mon, 14 Dec 2020 12:40:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2407316AbgLNMkI (ORCPT ); Mon, 14 Dec 2020 07:40:08 -0500 Received: from foss.arm.com ([217.140.110.172]:46750 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2407235AbgLNMkA (ORCPT ); Mon, 14 Dec 2020 07:40:00 -0500 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 CC63C11FB; Mon, 14 Dec 2020 04:39:14 -0800 (PST) Received: from e108754-lin.cambridge.arm.com (unknown [10.1.198.32]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 3AACB3F66B; Mon, 14 Dec 2020 04:39:13 -0800 (PST) From: Ionela Voinescu To: rjw@rjwysocki.net, viresh.kumar@linaro.org, lenb@kernel.org Cc: yousaf.kaukab@suse.com, jeremy.linton@arm.com, lukasz.luba@arm.com, valentin.schneider@arm.com, linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, ionela.voinescu@arm.com Subject: [PATCH v2 3/4] cppc_cpufreq: expose information on frequency domains Date: Mon, 14 Dec 2020 12:38:22 +0000 Message-Id: <20201214123823.3949-4-ionela.voinescu@arm.com> X-Mailer: git-send-email 2.29.2.dirty In-Reply-To: <20201214123823.3949-1-ionela.voinescu@arm.com> References: <20201214123823.3949-1-ionela.voinescu@arm.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Use the existing sysfs attribute "freqdomain_cpus" to expose information to userspace about CPUs in the same frequency domain. Signed-off-by: Ionela Voinescu Acked-by: Viresh Kumar Cc: Rafael J. Wysocki Cc: Viresh Kumar --- Documentation/ABI/testing/sysfs-devices-system-cpu | 3 ++- drivers/cpufreq/cppc_cpufreq.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 1a04ca8162ad..0eee30b27ab6 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -264,7 +264,8 @@ Description: Discover CPUs in the same CPU frequency coordination domain attribute is useful for user space DVFS controllers to get better power/performance results for platforms using acpi-cpufreq. - This file is only present if the acpi-cpufreq driver is in use. + This file is only present if the acpi-cpufreq or the cppc-cpufreq + drivers are in use. What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1} diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index f15a44c8b6b7..40b58d2dbbc6 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -402,6 +402,19 @@ static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state) return 0; } +static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf) +{ + unsigned int cpu = policy->cpu; + + return cpufreq_show_cpus(all_cpu_data[cpu]->shared_cpu_map, buf); +} +cpufreq_freq_attr_ro(freqdomain_cpus); + +static struct freq_attr *cppc_cpufreq_attr[] = { + &freqdomain_cpus, + NULL, +}; + static struct cpufreq_driver cppc_cpufreq_driver = { .flags = CPUFREQ_CONST_LOOPS, .verify = cppc_verify_policy, @@ -410,6 +423,7 @@ static struct cpufreq_driver cppc_cpufreq_driver = { .init = cppc_cpufreq_cpu_init, .stop_cpu = cppc_cpufreq_stop_cpu, .set_boost = cppc_cpufreq_set_boost, + .attr = cppc_cpufreq_attr, .name = "cppc_cpufreq", };