From patchwork Thu Aug 26 08:35:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincent Donnefort X-Patchwork-Id: 503568 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, 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 9E265C43214 for ; Thu, 26 Aug 2021 08:36:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70A3061151 for ; Thu, 26 Aug 2021 08:36:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240457AbhHZIhJ (ORCPT ); Thu, 26 Aug 2021 04:37:09 -0400 Received: from foss.arm.com ([217.140.110.172]:41526 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240327AbhHZIhI (ORCPT ); Thu, 26 Aug 2021 04:37:08 -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 A5AE21042; Thu, 26 Aug 2021 01:36:21 -0700 (PDT) Received: from e120877-lin.cambridge.arm.com (e120877-lin.cambridge.arm.com [10.1.194.43]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 100173F5A1; Thu, 26 Aug 2021 01:36:19 -0700 (PDT) From: Vincent Donnefort To: peterz@infradead.org, rjw@rjwysocki.net, viresh.kumar@linaro.org, vincent.guittot@linaro.org, qperret@google.com Cc: linux-pm@vger.kernel.org, ionela.voinescu@arm.com, lukasz.luba@arm.com, dietmar.eggemann@arm.com, mka@chromium.org, Vincent Donnefort Subject: [PATCH v5 2/8] PM / EM: Mark inefficient states Date: Thu, 26 Aug 2021 09:35:38 +0100 Message-Id: <1629966944-439570-3-git-send-email-vincent.donnefort@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1629966944-439570-1-git-send-email-vincent.donnefort@arm.com> References: <1629966944-439570-1-git-send-email-vincent.donnefort@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Some SoCs, such as the sd855 have OPPs within the same performance domain, whose cost is higher than others with a higher frequency. Even though those OPPs are interesting from a cooling perspective, it makes no sense to use them when the device can run at full capacity. Those OPPs handicap the performance domain, when choosing the most energy-efficient CPU and are wasting energy. They are inefficient. Hence, add support for such OPPs to the Energy Model. The table can now be read skipping inefficient performance states (and by extension, inefficient OPPs). Signed-off-by: Vincent Donnefort Reviewed-by: Matthias Kaehlcke Reviewed-by: Lukasz Luba diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index 1834752c5617..629f5f63a7d7 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -17,13 +17,25 @@ * device). It can be a total power: static and dynamic. * @cost: The cost coefficient associated with this level, used during * energy calculation. Equal to: power * max_frequency / frequency + * @flags: see "em_perf_state flags" description below. */ struct em_perf_state { unsigned long frequency; unsigned long power; unsigned long cost; + unsigned long flags; }; +/* + * em_perf_state flags: + * + * EM_PERF_STATE_INEFFICIENT: The performance state is inefficient. There is + * in this em_perf_domain, another performance state with a higher frequency + * but a lower or equal power cost. Such inefficient states are ignored when + * using em_pd_get_efficient_*() functions. + */ +#define EM_PERF_STATE_INEFFICIENT BIT(0) + /** * em_perf_domain - Performance domain * @table: List of performance states, in ascending order diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 97e62469a6b3..6d8438347535 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -2,7 +2,7 @@ /* * Energy Model of devices * - * Copyright (c) 2018-2020, Arm ltd. + * Copyright (c) 2018-2021, Arm ltd. * Written by: Quentin Perret, Arm ltd. * Improvements provided by: Lukasz Luba, Arm ltd. */ @@ -42,6 +42,7 @@ static void em_debug_create_ps(struct em_perf_state *ps, struct dentry *pd) debugfs_create_ulong("frequency", 0444, d, &ps->frequency); debugfs_create_ulong("power", 0444, d, &ps->power); debugfs_create_ulong("cost", 0444, d, &ps->cost); + debugfs_create_ulong("inefficient", 0444, d, &ps->flags); } static int em_debug_cpus_show(struct seq_file *s, void *unused) @@ -162,6 +163,7 @@ static int em_create_perf_table(struct device *dev, struct em_perf_domain *pd, table[i].cost = div64_u64(fmax * power_res, table[i].frequency); if (table[i].cost >= prev_cost) { + table[i].flags = EM_PERF_STATE_INEFFICIENT; dev_dbg(dev, "EM: OPP:%lu is inefficient\n", table[i].frequency); } else {