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=-2.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS 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 0B698C37121 for ; Mon, 21 Jan 2019 22:53:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B93AC2089F for ; Mon, 21 Jan 2019 22:53:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548111183; bh=LLn7e6zngS8l+68LE/uuWH1EcdVIXOlTC2hJcz3KRII=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=YfjUH1X1+X5pQk/FHuYNb8d3AmUNn6uBc98Gd2NmjWXebS8PPhhePMZBw54dRabeE p/DL6nnMiQAkB0UL9A/3/4nDriwnJQ/ALlcXky7KSWlnJ1zz3ch5KYtk2nY7ielNcP tZw4WDnDcfoyvvX7fyseo2F2HkfWQanLIjYhSvjs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727833AbfAUWxB convert rfc822-to-8bit (ORCPT ); Mon, 21 Jan 2019 17:53:01 -0500 Received: from mail-oi1-f193.google.com ([209.85.167.193]:39163 "EHLO mail-oi1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726244AbfAUWxB (ORCPT ); Mon, 21 Jan 2019 17:53:01 -0500 Received: by mail-oi1-f193.google.com with SMTP id i6so15861471oia.6; Mon, 21 Jan 2019 14:53:00 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=RE1kbIAbegVn9X8HfrM9/6EPqvEelSy8K4+3x3//ZGA=; b=mjm5nflTcdpDGXRf0TxD3olIbRmygcHCnLyTdZKg/OwyOiL9nHwNTPAQRCxULR4lsL FZICFySAY9j7U15ioQLjzZapb280SeUGjd7hHB4cMILbt4ZAuru1Yq5Led3UVxkOehF6 jwOEMO794YZbhlZGxgJfcpaS/HEsF2KCB6fDJQpAPTiapm7THHefTOBxwVs8jZi/dqzw AsKzeyvq2NXLkBadDNk12aYUgqZpjoLJC3R53C7k+Eb0N8YUsp1SnAXMtVOV90Jkh5kW Vioj/9bXzrCvE0WaLUY/8ag9HE9aDq1f8mMR++KQl36at8PdH55ii0D0FAUhnEbLYbeA T3UA== X-Gm-Message-State: AJcUukc3F+CDbFKcwzKI6I68GWM87Acq4ILakQ8re7E/4CAAAKwcZZlm 8g6Ov7J2ifBBljUw07Q7wuPkzNwRK2Lb2ki6W40= X-Google-Smtp-Source: ALg8bN4ZXdNgr4WBsQib7vp5nJYKT3yx3ddIDIZD86zhCHZywvmLKEmm+u4Bnb9svCFap7u5XJK+VFSzvLTd6Lpzo38= X-Received: by 2002:aca:368a:: with SMTP id d132mr7106897oia.193.1548111179893; Mon, 21 Jan 2019 14:52:59 -0800 (PST) MIME-Version: 1.0 References: <1545388436-7489-1-git-send-email-vincent.guittot@linaro.org> <1545388436-7489-4-git-send-email-vincent.guittot@linaro.org> <20190117221628.GA21979@roeck-us.net> <20190118104215.GA13168@linaro.org> <9ff86048-fca5-11b9-174c-f0a9338dd231@roeck-us.net> In-Reply-To: From: "Rafael J. Wysocki" Date: Mon, 21 Jan 2019 23:52:46 +0100 Message-ID: Subject: Re: [PATCH v5 3/3] PM/runtime:Replace jiffies based accounting with ktime based accounting To: Vincent Guittot Cc: Guenter Roeck , "Rafael J. Wysocki" , "open list:THERMAL" , linux-kernel , "Rafael J. Wysocki" , Thara Gopinath , Jani Nikula , Joonas Lahtinen , rodrigo.vivi@intel.com, David Airlie , "Intel graphics driver community testing & development" , dri-devel , Ulf Hansson Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 21, 2019 at 4:17 PM Vincent Guittot wrote: > > On Fri, 18 Jan 2019 at 13:08, Guenter Roeck wrote: > > > > On 1/18/19 3:05 AM, Rafael J. Wysocki wrote: > > > On Fri, Jan 18, 2019 at 11:53 AM Vincent Guittot > > > wrote: > > >> > > >> On Fri, 18 Jan 2019 at 11:42, Vincent Guittot > > >> wrote: > > >>> > > >>> Hi Guenter, > > >>> > > >>> Le Thursday 17 Jan 2019 à 14:16:28 (-0800), Guenter Roeck a écrit : > > >>>> On Fri, Dec 21, 2018 at 11:33:56AM +0100, Vincent Guittot wrote: > > >>>>> From: Thara Gopinath > > >>>>> > > >>>>> This patch replaces jiffies based accounting for runtime_active_time > > >>>>> and runtime_suspended_time with ktime base accounting. This makes the > > >>>>> runtime debug counters inline with genpd and other pm subsytems which > > >>>>> uses ktime based accounting. > > >>>>> > > >>>>> timekeeping is initialized before pm_runtime_init() so ktime_get() will > > >>>>> be ready before first call. In fact, timekeeping_init() is called early > > >>>>> in start_kernel() which is way before driver_init() (and that's when > > >>>>> devices can start to be initialized) called from rest_init() via > > >>>>> kernel_init_freeable() and do_basic_setup(). > > >>>>> > > >>>> This is not (always) correct. My qemu "collie" boot test fails with this > > >>>> patch applied. Reverting the patch fixes the problem. Bisect log attached. > > >>>> > > >>> > > >>> Can you try the patch below ? > > >>> ktime_get_mono_fast_ns() has the advantage of being init with dummy clock so > > >>> it can be used at early_init. > > >> > > >> Another possibility would be delay the init of the gpiochip > > > > > > Well, right. > > > > > > Initializing devices before timekeeping doesn't feel particularly > > > robust from the design perspective. > > > > > > How exactly does that happen? > > > > > > > With an added 'initialized' flag and backtrace into the timekeeping code, > > with the change suggested earlier applied: > > > > ------------[ cut here ]------------ > > WARNING: CPU: 0 PID: 0 at kernel/time/timekeeping.c:453 ktime_get_mono_fast_ns+0x114/0x12c > > Timekeeping not initialized > > CPU: 0 PID: 0 Comm: swapper Not tainted 5.0.0-rc2-next-20190117-dirty #2 > > Hardware name: Sharp-Collie > > Backtrace: > > [] (dump_backtrace) from [] (show_stack+0x18/0x1c) > > r7:00000009 r6:00000000 r5:c065ba90 r4:c06d3e54 > > [] (show_stack) from [] (dump_stack+0x20/0x28) > > [] (dump_stack) from [] (__warn+0xcc/0xf4) > > [] (__warn) from [] (warn_slowpath_fmt+0x4c/0x6c) > > r8:df407b08 r7:00000000 r6:c0c01550 r5:c065bad8 r4:c06dd028 > > [] (warn_slowpath_fmt) from [] (ktime_get_mono_fast_ns+0x114/0x12c) > > r3:00000000 r2:c065bad8 > > r5:00000000 r4:df407b08 > > [] (ktime_get_mono_fast_ns) from [] (pm_runtime_init+0x38/0xb8) > > r9:c06c9a5c r8:df407b08 r7:00000000 r6:c0c01550 r5:00000000 r4:df407b08 > > [] (pm_runtime_init) from [] (device_initialize+0xb0/0xec) > > r7:00000000 r6:c0c01550 r5:00000000 r4:df407b08 > > [] (device_initialize) from [] (gpiochip_add_data_with_key+0x9c/0x884) > > r7:00000000 r6:c06fca34 r5:00000000 r4:00000000 > > [] (gpiochip_add_data_with_key) from [] (sa1100_init_gpio+0x40/0x98) > > r10:dfffcd60 r9:c06c9a5c r8:c06dd020 r7:c06dd028 r6:ffffffff r5:00000000 > > r4:c06fca34 > > [] (sa1100_init_gpio) from [] (sa1100_init_irq+0x2c/0x3c) > > r7:c06dd028 r6:ffffffff r5:c0713300 r4:c06e1070 > > [] (sa1100_init_irq) from [] (init_IRQ+0x20/0x28) > > r5:c0713300 r4:00000000 > > [] (init_IRQ) from [] (start_kernel+0x254/0x4cc) > > [] (start_kernel) from [<00000000>] ( (null)) > > r10:0000717f r9:6901b119 r8:c0000100 r7:00000092 r6:0000313d r5:00000053 > > r4:c06a7330 > > ---[ end trace 91e1bd00dd7cce32 ]--- > > Does it means that only the pm_runtime_init is done before > timekeeping_init() but no update_pm_runtime_accounting() ? This platform calls device_initialize(), via sa1100_init_irq(), from init_IRQ() which is in the start_kernel() code path before timekeeping_init(). That's the initialization of structure fields alone. Runtime PM really cannot be used legitimately before driver_init(), because it needs bus types to be there at least. > In this case, we can keep using ktimeçget in > update_pm_runtime_accounting() and find a solution to deal with > early_call of pm_runtime_init() Given the above, I think that initializing accounting_timestamp in pm_runtime_init() to anything different from 0 is a mistake. Note that update_pm_runtime_accounting() ignores the delta value if power.disable_depth is not zero anyway, so it really should be sufficient to update accounting_timestamp when enabling runtime PM - and I'm not sure why it is not updated in pm_runtime_enable() for that matter (that looks like a bug to me). From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: Re: [PATCH v5 3/3] PM/runtime:Replace jiffies based accounting with ktime based accounting Date: Mon, 21 Jan 2019 23:52:46 +0100 Message-ID: References: <1545388436-7489-1-git-send-email-vincent.guittot@linaro.org> <1545388436-7489-4-git-send-email-vincent.guittot@linaro.org> <20190117221628.GA21979@roeck-us.net> <20190118104215.GA13168@linaro.org> <9ff86048-fca5-11b9-174c-f0a9338dd231@roeck-us.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Vincent Guittot Cc: Ulf Hansson , dri-devel , "open list:THERMAL" , David Airlie , Intel graphics driver community testing & development , "Rafael J. Wysocki" , "Rafael J. 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