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 X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 ADFF9C433FE for ; Mon, 6 Sep 2021 14:11:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 96C8B60524 for ; Mon, 6 Sep 2021 14:11:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243201AbhIFOMh (ORCPT ); Mon, 6 Sep 2021 10:12:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57034 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243169AbhIFOMf (ORCPT ); Mon, 6 Sep 2021 10:12:35 -0400 Received: from mail-lj1-x22b.google.com (mail-lj1-x22b.google.com [IPv6:2a00:1450:4864:20::22b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F6A1C061575; Mon, 6 Sep 2021 07:11:30 -0700 (PDT) Received: by mail-lj1-x22b.google.com with SMTP id f2so11598490ljn.1; Mon, 06 Sep 2021 07:11:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=zZggPjhx+8+aupkWFSxcS4wLcFNjdVmDJ+q9FbeStYM=; b=SENtr9O3Gx326nfrYlnyImNgmBzsv3Vtsvg9RfVcQ3HjaOkbL5JzZ25JAD16EbT4vl dWBiOKf4wtOUnbtqdSvKFUG1BpR9WyIluCpOifosq/O47vHh5KVBNpxbdE1BenGzkQHU /sGO+mBwXFAPScj/O6wDTW6QhCHF1baQFbMm4YgvMNG7TN4n0HhmtXwEnj0CVP3Xtfb1 zaExjV4OLZDRgtp/aRe1OOF3zIfV49Bj5NZt8GYJC+vNtqUdiTCCmapJP4dqJZbuf6yP eQm1oow9QcvPnRhIM7MIVIz/MU1DsY4tmTu+TJ2GCWf4Mkc0e0hqDCBYT7MZKQR5gXkJ 0pWA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=zZggPjhx+8+aupkWFSxcS4wLcFNjdVmDJ+q9FbeStYM=; b=OWxfPcoFOiqQnR17Z9Di1sLNJfgLDO/NQVKqEH30b2EiRlwhUW7zGOa4pVyvFtg2ba xYTZ+SnhDx4R6wenNRG8uynYL67xmzQq56tkJOFxCuev2YkNc0p7CBnhhhaOZpWnkQfa mVVPM9ONWGJIzg1vla8HmI9qlEGXFOUKjYJ6HsxBbweaaxFsKjS0/LJ2LhuG8P4tGdbl a+Y7VLgTxDPGZDBYrwBTsVvfY/5aheLo8K01+WiUgt4jZbcTz61lZtz9zcUD/sywD15T Y3cOKXE6YsQhCGWTeHuIXeZ0TGGahB1U6DoTaPKEL8LbwdFiKyryoqrK+4U30OVngvyJ xRiA== X-Gm-Message-State: AOAM531Mpn0zGYQOp2I3Xw5zFUt5uimv84bQC0h02fnZHtH0WFLIXeVG vo5nvX+nHi1MPOP7Mm8XQFZx0sAxzdE= X-Google-Smtp-Source: ABdhPJzF5abV/WMXCGDW39/7j4zAz5FxR8KMOu7LYg7zcHQU0Wkq1Ug4jb1JInQVjCIgGrSq6W9Lng== X-Received: by 2002:a05:651c:10a2:: with SMTP id k2mr11353085ljn.262.1630937488606; Mon, 06 Sep 2021 07:11:28 -0700 (PDT) Received: from [192.168.2.145] (46-138-3-129.dynamic.spd-mgts.ru. [46.138.3.129]) by smtp.googlemail.com with ESMTPSA id t20sm756427lfk.157.2021.09.06.07.11.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Sep 2021 07:11:27 -0700 (PDT) Subject: Re: [PATCH 1/3] PM: domains: Drop the performance state vote for a device at detach To: Ulf Hansson Cc: "Rafael J . Wysocki" , Viresh Kumar , Linux PM , Dmitry Baryshkov , Jonathan Hunter , Thierry Reding , Rajendra Nayak , Stephan Gerhold , Bjorn Andersson , Linux ARM , Linux Kernel Mailing List References: <20210902101634.827187-1-ulf.hansson@linaro.org> <20210902101634.827187-2-ulf.hansson@linaro.org> <08335cd4-7dc8-3b8b-d63f-374585ffa373@gmail.com> <6603212d-f36c-afff-6222-8125de5b7b79@gmail.com> From: Dmitry Osipenko Message-ID: <66fbbc69-3e16-e07c-4e25-48d59d69fd3c@gmail.com> Date: Mon, 6 Sep 2021 17:11:26 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 06.09.2021 13:24, Ulf Hansson пишет: > On Sun, 5 Sept 2021 at 10:26, Dmitry Osipenko wrote: >> >> 03.09.2021 17:03, Ulf Hansson пишет: >>> On Fri, 3 Sept 2021 at 11:58, Dmitry Osipenko wrote: >>>> >>>> 03.09.2021 11:22, Ulf Hansson пишет: >>>>> On Fri, 3 Sept 2021 at 08:01, Dmitry Osipenko wrote: >>>>>> >>>>>> 02.09.2021 13:16, Ulf Hansson пишет: >>>>>>> When a device is detached from its genpd, genpd loses track of the device, >>>>>>> including its performance state vote that may have been requested for it. >>>>>>> >>>>>>> Rather than relying on the consumer driver to drop the performance state >>>>>>> vote for its device, let's do it internally in genpd when the device is >>>>>>> getting detached. In this way, we makes sure that the aggregation of the >>>>>>> votes in genpd becomes correct. >>>>>> >>>>>> This is a dangerous behaviour in a case where performance state >>>>>> represents voltage. If hardware is kept active on detachment, say it's >>>>>> always-on, then it may be a disaster to drop the voltage for the active >>>>>> hardware. >>>>>> >>>>>> It's safe to drop performance state only if you assume that there is a >>>>>> firmware behind kernel which has its own layer of performance management >>>>>> and it will prevent the disaster by saying 'nope, I'm not doing this'. >>>>>> >>>>>> The performance state should be persistent for a device and it should be >>>>>> controlled in a conjunction with runtime PM. If platform wants to drop >>>>>> performance state to zero on detachment, then this behaviour should be >>>>>> specific to that platform. >>>>> >>>>> I understand your concern, but at this point, genpd can't help to fix this. >>>>> >>>>> Genpd has no information about the device, unless it's attached to it. >>>>> For now and for these always on HWs, we simply need to make sure the >>>>> device stays attached, in one way or the other. >>>> >>>> This indeed requires to redesign GENPD to make it more coupled with a >>>> device, but this is not a real problem for any of the current API users >>>> AFAIK. Ideally the state should be persistent to make API more universal. >>> >>> Right. In fact this has been discussed in the past. In principle, the >>> idea was to attach to genpd at device registration, rather than at >>> driver probe. >>> >>> Although, this is not very easy to implement - and it seems like the >>> churns to do, have not been really worth it. At least so far. >>> >>>> >>>> Since for today we assume that device should be suspended at the time of >>>> the detachment (if the default OPP state isn't used), it may be better >>>> to add a noisy warning message if pstate!=0, keeping the state untouched >>>> if it's not zero. >>> >>> That would just be very silly in my opinion. >>> >>> When the device is detached (suspended or not), it may cause it's PM >>> domain to be powered off - and there is really nothing we can do about >>> that from the genpd point of view. >>> >>> As stated, the only current short term solution is to avoid detaching >>> the device. Anything else, would just be papering of the issue. >> >> What about to re-evaluate the performance state of the domain after >> detachment instead of setting the state to zero? > > I am not suggesting to set the performance state of the genpd to zero, > but to drop a potential vote for a performance state for the *device* > that is about to be detached. By removing the vote of the *device*, you will drop the performance state of the genpd. If device is active and it's wrong to drop its state, then you may cause the damage. > Calling genpd_set_performance_state(dev, 0), during detach will have > the same effect as triggering a re-evaluation of the performance state > for the genpd, but after the detach. Yes >> This way PD driver may >> take an action on detachment if performance isn't zero, before hardware >> is crashed, for example it may emit a warning. > > Not sure I got that. Exactly when do you want to emit a warning and > for what reason? > > Do you want to add a check somewhere to see if > 'gpd_data->performance_state' is non zero - and then print a warning? I want to check the 'gpd_data->performance_state' from the detachment callback and emit the warning + lock further performance changes in the PD driver since it's a error condition. 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[46.138.3.129]) by smtp.googlemail.com with ESMTPSA id t20sm756427lfk.157.2021.09.06.07.11.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Sep 2021 07:11:27 -0700 (PDT) Subject: Re: [PATCH 1/3] PM: domains: Drop the performance state vote for a device at detach To: Ulf Hansson Cc: "Rafael J . Wysocki" , Viresh Kumar , Linux PM , Dmitry Baryshkov , Jonathan Hunter , Thierry Reding , Rajendra Nayak , Stephan Gerhold , Bjorn Andersson , Linux ARM , Linux Kernel Mailing List References: <20210902101634.827187-1-ulf.hansson@linaro.org> <20210902101634.827187-2-ulf.hansson@linaro.org> <08335cd4-7dc8-3b8b-d63f-374585ffa373@gmail.com> <6603212d-f36c-afff-6222-8125de5b7b79@gmail.com> From: Dmitry Osipenko Message-ID: <66fbbc69-3e16-e07c-4e25-48d59d69fd3c@gmail.com> Date: Mon, 6 Sep 2021 17:11:26 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210906_071131_462584_A77D0053 X-CRM114-Status: GOOD ( 31.21 ) 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: , 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