From patchwork Thu Aug 25 20:03:17 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lina Iyer X-Patchwork-Id: 9299817 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A8BCD60757 for ; Thu, 25 Aug 2016 20:05:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9A6EF2936B for ; Thu, 25 Aug 2016 20:05:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8F146293B9; Thu, 25 Aug 2016 20:05:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 46CFC29384 for ; Thu, 25 Aug 2016 20:05:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757934AbcHYUEu (ORCPT ); Thu, 25 Aug 2016 16:04:50 -0400 Received: from mail-pa0-f44.google.com ([209.85.220.44]:33497 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757590AbcHYUEX (ORCPT ); Thu, 25 Aug 2016 16:04:23 -0400 Received: by mail-pa0-f44.google.com with SMTP id ti13so19767234pac.0 for ; Thu, 25 Aug 2016 13:04:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=nP2WZEnkovd6MyeNkqtBYHiNrUsPjiWq+Ghgyn8hWr8=; b=isnKHL0cwqKJg44VH4WXwRx//++IMUXA6DBgjoNl0etS1SmIPo55Qc+ZGdHIEQlfre satwhucpW91QdJClcrleLhOK9q8LUBum7U24ipTcdrOSGIkNeamRXkhRMdtdr7SOeydB eGSVD10yq+W9hdeiqsy/1WqRJTAdBDvN4SCUM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=nP2WZEnkovd6MyeNkqtBYHiNrUsPjiWq+Ghgyn8hWr8=; b=isJOHmk+1CPKkEuKf/csMHWwd4XiTnMjDrtu9nIkcDqsUQDshj1iCgno6/dqccKTyl mKzRRU/oa3D3wA08oyrSrUQDOlb90uDXyUAoVNa99T5NK/jodRNnLUKa4ZXzGMwqWOeS FWsdg7y9tYmcChY1lpkeAw2NEP8zQ6sccEKoeRTsCpyjhhya+X6z5HAbnzKLca5Cguft 7Z9zVL0bbMzJW+F3r9xM8WGq2dyIrUMK1y/lKWNwOzOAkFEZiQ1LrM1PM0mZjK+esNTB M/rprAgcYGxDpoAreMJbz/KBj9GaotvnxnhJkGR9KJkAWa9QOCzKuX1WCviUhRVK5H8Y 01NA== X-Gm-Message-State: AE9vXwPVbg2lkBZLKBbaKfBJbmnIhSbcQtHSkI4DvJ8dnyLVfxPg3w4TVIWI/T7VthG5iVGa X-Received: by 10.66.78.35 with SMTP id y3mr19480348paw.40.1472155441563; Thu, 25 Aug 2016 13:04:01 -0700 (PDT) Received: from ubuntu.localdomain (i-global254.qualcomm.com. [199.106.103.254]) by smtp.gmail.com with ESMTPSA id u1sm22841644pfu.12.2016.08.25.13.03.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 25 Aug 2016 13:04:00 -0700 (PDT) From: Lina Iyer To: ulf.hansson@linaro.org, khilman@kernel.org, rjw@rjwysocki.net, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: andy.gross@linaro.org, sboyd@codeaurora.org, linux-arm-msm@vger.kernel.org, brendan.jackman@arm.com, lorenzo.pieralisi@arm.com, sudeep.holla@arm.com, Juri.Lelli@arm.com, Lina Iyer , Daniel Lezcano Subject: [PATCH v4 08/16] ARM: cpuidle: Add runtime PM support for CPUs Date: Thu, 25 Aug 2016 14:03:17 -0600 Message-Id: <1472155405-41841-9-git-send-email-lina.iyer@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1472155405-41841-1-git-send-email-lina.iyer@linaro.org> References: <1472155405-41841-1-git-send-email-lina.iyer@linaro.org> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Notify runtime PM when the CPU is going to be powered off in the idle state. This allows for runtime PM suspend/resume of the CPU as well as its PM domain. We do not call into runtime PM for ARM WFI to keep the default state simple and faster. Cc: Daniel Lezcano Cc: Lorenzo Pieralisi Signed-off-by: Lina Iyer --- drivers/cpuidle/cpuidle-arm.c | 55 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c index e342565e..3abd145 100644 --- a/drivers/cpuidle/cpuidle-arm.c +++ b/drivers/cpuidle/cpuidle-arm.c @@ -11,12 +11,14 @@ #define pr_fmt(fmt) "CPUidle arm: " fmt +#include #include #include #include #include #include #include +#include #include #include @@ -37,6 +39,7 @@ static int arm_enter_idle_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, int idx) { int ret; + struct device *cpu_dev = get_cpu_device(dev->cpu); if (!idx) { cpu_do_idle(); @@ -46,12 +49,20 @@ static int arm_enter_idle_state(struct cpuidle_device *dev, ret = cpu_pm_enter(); if (!ret) { /* + * Call runtime PM suspend on our device + * Notify RCU to pay attention to critical sections + * called from within runtime PM. + */ + RCU_NONIDLE(pm_runtime_put_sync_suspend(cpu_dev)); + + /* * Pass idle state index to cpu_suspend which in turn will * call the CPU ops suspend protocol with idle index as a * parameter. */ ret = arm_cpuidle_suspend(idx); + RCU_NONIDLE(pm_runtime_get_sync(cpu_dev)); cpu_pm_exit(); } @@ -84,6 +95,34 @@ static const struct of_device_id arm_idle_state_match[] __initconst = { { }, }; +#ifdef CONFIG_HOTPLUG_CPU +static int arm_idle_cpu_hotplug(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *cpu_dev = get_cpu_device(smp_processor_id()); + + /* Execute CPU runtime PM on that CPU */ + switch (action & ~CPU_TASKS_FROZEN) { + case CPU_DYING: + pm_runtime_put_sync_suspend(cpu_dev); + break; + case CPU_STARTING: + pm_runtime_get_sync(cpu_dev); + break; + default: + break; + } + + return NOTIFY_OK; +} +#else +static int arm_idle_cpu_hotplug(struct notifier_block *nb, + unsigned long action, void *data) +{ + return NOTIFY_OK; +} +#endif + /* * arm_idle_init * @@ -96,6 +135,7 @@ static int __init arm_idle_init(void) int cpu, ret; struct cpuidle_driver *drv = &arm_idle_driver; struct cpuidle_device *dev; + struct device *cpu_dev; /* * Initialize idle states data, starting at index 1. @@ -118,6 +158,16 @@ static int __init arm_idle_init(void) * idle states suspend back-end specific data */ for_each_possible_cpu(cpu) { + + /* Initialize Runtime PM for the CPU */ + cpu_dev = get_cpu_device(cpu); + pm_runtime_irq_safe(cpu_dev); + pm_runtime_enable(cpu_dev); + if (cpu_online(cpu)) { + pm_runtime_get_noresume(cpu_dev); + pm_runtime_set_active(cpu_dev); + } + ret = arm_cpuidle_init(cpu); /* @@ -148,10 +198,15 @@ static int __init arm_idle_init(void) } } + /* Register for hotplug notifications for runtime PM */ + hotcpu_notifier(arm_idle_cpu_hotplug, 0); + return 0; out_fail: while (--cpu >= 0) { dev = per_cpu(cpuidle_devices, cpu); + cpu_dev = get_cpu_device(cpu); + __pm_runtime_disable(cpu_dev, false); cpuidle_unregister_device(dev); kfree(dev); }