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 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 0EFA0C4345F for ; Mon, 22 Apr 2024 13:12:07 +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:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=dOOia365IRuvCE9EIX+ELcB6wkJsU8T1iVS/d7U24ws=; b=W8+kbiuz8dZ9i4 O2jDNGzrriERxiZg9S4dCl8fv7XEo9e8Drb1i7IUIblM64+dlxeKdjkW3tKDmm/tVyaIBgMcTMqRZ AfItQVxr5bWOJMvnzkyMl+9Pszg3YyN7i4rltMNYR4HE0nSmQ/26aMcbLIFUnjjYPxbMDZJ9BjDLr jaOK0aYHfRWq85MtOfsRFZ6bT0ZlbSnxCtHTLYoBWPgLpOMuATb5By62KHFJPvxIfPhiex9Eq88Wk z/0se4CAZahQtCfYkZTuJ46Avp3403J+me5fEskBbbWwvmnHFpPyg6zN9nwcMD2reztKBFvlq/5yb UeMbHXzthbXWM76HYAjw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rytSg-0000000Dgvv-42Z7; Mon, 22 Apr 2024 13:11:59 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rytSe-0000000Dgur-1GmA for linux-arm-kernel@lists.infradead.org; Mon, 22 Apr 2024 13:11:57 +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 D41D8339; Mon, 22 Apr 2024 06:12:23 -0700 (PDT) Received: from [192.168.178.110] (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 285833F73F; Mon, 22 Apr 2024 06:11:54 -0700 (PDT) Message-ID: <780caf10-964c-4a5b-8333-b448e9cbab4b@arm.com> Date: Mon, 22 Apr 2024 15:11:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] cpufreq: scmi: Update Energy Model with allowed performance limits Content-Language: en-US To: Lukasz Luba , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, sudeep.holla@arm.com, cristian.marussi@arm.com, linux-samsung-soc@vger.kernel.org, rafael@kernel.org, viresh.kumar@linaro.org, quic_sibis@quicinc.com References: <20240403162315.1458337-1-lukasz.luba@arm.com> <20240403162315.1458337-3-lukasz.luba@arm.com> From: Dietmar Eggemann In-Reply-To: <20240403162315.1458337-3-lukasz.luba@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240422_061156_431634_BF10C8C8 X-CRM114-Status: UNSURE ( 6.86 ) X-CRM114-Notice: Please train this message. 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 03/04/2024 18:23, Lukasz Luba wrote: > The Energy Model (EM) supports performance limits updates. Use the SCMI > notifications to get information from FW about allowed frequency scope for > the CPUs. I'm slightly confused here. IMHO this doesn't seem to be related to the "HW dependency between 'little CPUs & L3 $ in DSU' or similar" usecase. I assumed that this usecase is rather handled via an additional out-of-tree driver, potentially the same which updates the EM because of temperature change (em_dev_compute_costs(), em_dev_update_perf_domain()) or chip binning (em_dev_update_chip_binning()). What about other CPUFreq drivers registering an EM via em_dev_register_perf_domain() or 'cpufreq_register_em_with_opp() -> dev_pm_opp_of_register_em()'? Or is this 'limit notification' an SCMI FW only thing? [...] _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel