From patchwork Wed Mar 16 23:52:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Luba X-Patchwork-Id: 12783318 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6D822C433EF for ; Wed, 16 Mar 2022 23:53:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date:Subject:Cc:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=stpxPFADlhhdd+2UMTzwsvaXQidjrg2VoJtY5+DZYfk=; b=Vco6aRbNPxcEU+ A50Zsz+J9Ucf8TH8X7chn14z1lghmXkIgGTCcW+D91QYtMuBVS1Vu2zPBK+ytOVBreXeKHEI+FpjY JpT3FvHnvNdKthmAB5fGWT0oPshbVB+ig71BOHaOd+wyV9yhqUMg+iJeLVLJ2hM3zTFez6A3NUb5i j4lU2Ml+DOFDNDWHviW8Or22Vt/JccLAkGA9hHFedwCQb0DmPpAciE8jCwp3pwCSXIZGj7hgDq5vg J5GqE1BIS238jna9tSV0LdOOzOHl7Tvn0UfaagacRAU5o44wuCMeAoUkhH7ooUYWqRwl6ghy54+23 lHiBTK9tM6Et/njk8syg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nUdRQ-00EVx9-Ga; Wed, 16 Mar 2022 23:52:32 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nUdRM-00EVvb-QX; Wed, 16 Mar 2022 23:52:30 +0000 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 4DA3F1476; Wed, 16 Mar 2022 16:52:23 -0700 (PDT) Received: from e123648.arm.com (unknown [10.57.19.225]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 61BC43F766; Wed, 16 Mar 2022 16:52:20 -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: [0/8] Introduce support for artificial Energy Model Date: Wed, 16 Mar 2022 23:52:03 +0000 Message-Id: <20220316235211.29370-1-lukasz.luba@arm.com> X-Mailer: git-send-email 2.17.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220316_165228_954308_AC72C579 X-CRM114-Status: GOOD ( 12.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi all, This patch set adds new callback and support for artificial Energy Model (EM). The new EMs have artificially generated performance states. Such EMs can be created from lean information sources, such as the relative energy efficiency between CPUs. The ACPI based platforms provide this information (ACPI 6.4, s5.2.12.14 'GIC CPU Interface (GICC) Structure' 'Processor Power efficiency Class' field). Artificial EMs might require to directly provide the 'cost' of the generated performance state. This patch set adds a new callback .get_cost() for this. The EM framework does not force any model or formula, it's up to the platform code. Artificial EMs aim to leverage the Energy Aware Scheduler (EAS). Other frameworks relying on performance states information (i.e. IPA/DTPM) must be informed of the EM type and might be prevented from using it. This patch sets also does this by introducing a new flag: EM_PERF_DOMAIN_ARTIFICIAL. The patch set is based on current linux-next, where some changes to OPP & EM are queuing. The patch set also contains (patch 7/8 and patch 8/8) logic which prevents two EM's client frameworks from using this new EM type. Some other approach, using 'milli-watts', has been proposed and discussed, but refused [1]. This new flag is more precised and should not leave space for wrong interpretation. Shortly after this patch set you will see a patch set implementing the platform code and registering this new EM. Regards, Lukasz Luba [1] https://lore.kernel.org/linux-pm/20220207073036.14901-1-lukasz.luba@arm.com/ Lukasz Luba (7): PM: EM: Add .get_cost() callback PM: EM: Use the new .get_cost() callback while registering EM PM: EM: Change the order of arguments in the .active_power() callback PM: EM: Remove old debugfs files and print all 'flags' Documentation: EM: Add artificial EM registration description thermal: cooling: Check Energy Model type in cpufreq_cooling and devfreq_cooling powercap: DTPM: Check for Energy Model type Pierre Gondois (1): PM: EM: Add artificial EM flag Documentation/power/energy-model.rst | 24 +++++++++- drivers/cpufreq/mediatek-cpufreq-hw.c | 4 +- drivers/cpufreq/scmi-cpufreq.c | 4 +- drivers/opp/of.c | 6 +-- drivers/powercap/dtpm_cpu.c | 2 +- drivers/thermal/cpufreq_cooling.c | 2 +- drivers/thermal/devfreq_cooling.c | 8 ++-- include/linux/energy_model.h | 35 +++++++++++++-- kernel/power/energy_model.c | 63 +++++++++++++++------------ 9 files changed, 101 insertions(+), 47 deletions(-)