From patchwork Tue Feb 18 02:28:46 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuansheng Liu X-Patchwork-Id: 3666811 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 7DF669F38B for ; Tue, 18 Feb 2014 02:39:19 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A9E3D201D3 for ; Tue, 18 Feb 2014 02:39:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BAAB5201C7 for ; Tue, 18 Feb 2014 02:39:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754045AbaBRCjQ (ORCPT ); Mon, 17 Feb 2014 21:39:16 -0500 Received: from mga03.intel.com ([143.182.124.21]:58660 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754019AbaBRCjP (ORCPT ); Mon, 17 Feb 2014 21:39:15 -0500 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by azsmga101.ch.intel.com with ESMTP; 17 Feb 2014 18:39:14 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,864,1389772800"; d="scan'208";a="476798941" Received: from shsibuild003.sh.intel.com ([10.239.146.212]) by fmsmga001.fm.intel.com with ESMTP; 17 Feb 2014 18:39:12 -0800 From: Chuansheng Liu To: rjw@rjwysocki.net, gregkh@linuxfoundation.org, len.brown@intel.com, pavel@ucw.cz Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, zhuangzhi.li@intel.com, chuansheng.liu@intel.com Subject: [PATCH v4 3/5] PM / sleep: Asynchronous threads for resume_early Date: Tue, 18 Feb 2014 10:28:46 +0800 Message-Id: <1392690528-10024-4-git-send-email-chuansheng.liu@intel.com> X-Mailer: git-send-email 1.9.rc0 In-Reply-To: <1392690528-10024-1-git-send-email-chuansheng.liu@intel.com> References: <1392690528-10024-1-git-send-email-chuansheng.liu@intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In analogy with commits 5af84b82701a and 97df8c12995, using asynchronous threads can improve the overall resume_early time significantly. This patch is for resume_early phase. Signed-off-by: Chuansheng Liu --- drivers/base/power/main.c | 55 +++++++++++++++++++++++++++++++++++++---------- 1 file changed, 44 insertions(+), 11 deletions(-) diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index ea3f1d2..6d41165 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -595,7 +595,7 @@ static void dpm_resume_noirq(pm_message_t state) * * Runtime PM is disabled for @dev while this function is being executed. */ -static int device_resume_early(struct device *dev, pm_message_t state) +static int device_resume_early(struct device *dev, pm_message_t state, bool async) { pm_callback_t callback = NULL; char *info = NULL; @@ -610,6 +610,8 @@ static int device_resume_early(struct device *dev, pm_message_t state) if (!dev->power.is_late_suspended) goto Out; + dpm_wait(dev->parent, async); + if (dev->pm_domain) { info = "early power domain "; callback = pm_late_early_op(&dev->pm_domain->ops, state); @@ -636,38 +638,69 @@ static int device_resume_early(struct device *dev, pm_message_t state) TRACE_RESUME(error); pm_runtime_enable(dev); + complete_all(&dev->power.completion); return error; } +static void async_resume_early(void *data, async_cookie_t cookie) +{ + struct device *dev = (struct device *)data; + int error; + + error = device_resume_early(dev, pm_transition, true); + if (error) + pm_dev_err(dev, pm_transition, " async", error); + + put_device(dev); +} + /** * dpm_resume_early - Execute "early resume" callbacks for all devices. * @state: PM transition of the system being carried out. */ static void dpm_resume_early(pm_message_t state) { + struct device *dev; ktime_t starttime = ktime_get(); mutex_lock(&dpm_list_mtx); - while (!list_empty(&dpm_late_early_list)) { - struct device *dev = to_device(dpm_late_early_list.next); - int error; + pm_transition = state; + + /* + * Advanced the async threads upfront, + * in case the starting of async threads is + * delayed by non-async resuming devices. + */ + list_for_each_entry(dev, &dpm_late_early_list, power.entry) { + reinit_completion(&dev->power.completion); + if (is_async(dev)) { + get_device(dev); + async_schedule(async_resume_early, dev); + } + } + while (!list_empty(&dpm_late_early_list)) { + dev = to_device(dpm_late_early_list.next); get_device(dev); list_move_tail(&dev->power.entry, &dpm_suspended_list); mutex_unlock(&dpm_list_mtx); - error = device_resume_early(dev, state); - if (error) { - suspend_stats.failed_resume_early++; - dpm_save_failed_step(SUSPEND_RESUME_EARLY); - dpm_save_failed_dev(dev_name(dev)); - pm_dev_err(dev, state, " early", error); - } + if (!is_async(dev)) { + int error; + error = device_resume_early(dev, state, false); + if (error) { + suspend_stats.failed_resume_early++; + dpm_save_failed_step(SUSPEND_RESUME_EARLY); + dpm_save_failed_dev(dev_name(dev)); + pm_dev_err(dev, state, " early", error); + } + } mutex_lock(&dpm_list_mtx); put_device(dev); } mutex_unlock(&dpm_list_mtx); + async_synchronize_full(); dpm_show_time(starttime, state, "early"); }