From patchwork Thu Aug 18 12:57:27 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Andrzej Siewior X-Patchwork-Id: 9287581 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 10C8060459 for ; Thu, 18 Aug 2016 12:59:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0251328FA4 for ; Thu, 18 Aug 2016 12:59:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EB64D291A7; Thu, 18 Aug 2016 12:59:33 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable 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 8FB3328FA4 for ; Thu, 18 Aug 2016 12:59:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1947145AbcHRM6Q (ORCPT ); Thu, 18 Aug 2016 08:58:16 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:44055 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1947138AbcHRM6P (ORCPT ); Thu, 18 Aug 2016 08:58:15 -0400 Received: from localhost ([127.0.0.1] helo=bazinga.breakpoint.cc) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1baMtZ-0008Nj-T8; Thu, 18 Aug 2016 14:58:06 +0200 From: Sebastian Andrzej Siewior To: linux-kernel@vger.kernel.org Cc: Peter Zijlstra , Ingo Molnar , rt@linutronix.de, Sebastian Andrzej Siewior , "Rafael J. Wysocki" , Daniel Lezcano , linux-pm@vger.kernel.org Subject: [PATCH 12/16] cpuidle: coupled: Convert to hotplug state machine Date: Thu, 18 Aug 2016 14:57:27 +0200 Message-Id: <20160818125731.27256-13-bigeasy@linutronix.de> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20160818125731.27256-1-bigeasy@linutronix.de> References: <20160818125731.27256-1-bigeasy@linutronix.de> 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 Install the callbacks via the state machine. Cc: "Rafael J. Wysocki" Cc: Daniel Lezcano Cc: linux-pm@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior --- drivers/cpuidle/coupled.c | 81 +++++++++++++++++++++------------------------- include/linux/cpuhotplug.h | 1 + 2 files changed, 38 insertions(+), 44 deletions(-) diff --git a/drivers/cpuidle/coupled.c b/drivers/cpuidle/coupled.c index d5657d50ac40..11efd9743e88 100644 --- a/drivers/cpuidle/coupled.c +++ b/drivers/cpuidle/coupled.c @@ -749,65 +749,58 @@ static void cpuidle_coupled_allow_idle(struct cpuidle_coupled *coupled) put_cpu(); } -/** - * cpuidle_coupled_cpu_notify - notifier called during hotplug transitions - * @nb: notifier block - * @action: hotplug transition - * @hcpu: target cpu number - * - * Called when a cpu is brought on or offline using hotplug. Updates the - * coupled cpu set appropriately - */ -static int cpuidle_coupled_cpu_notify(struct notifier_block *nb, - unsigned long action, void *hcpu) +static int coupled_cpu_online(unsigned int cpu) { - int cpu = (unsigned long)hcpu; struct cpuidle_device *dev; - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_UP_PREPARE: - case CPU_DOWN_PREPARE: - case CPU_ONLINE: - case CPU_DEAD: - case CPU_UP_CANCELED: - case CPU_DOWN_FAILED: - break; - default: - return NOTIFY_OK; - } - mutex_lock(&cpuidle_lock); dev = per_cpu(cpuidle_devices, cpu); if (!dev || !dev->coupled) goto out; - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_UP_PREPARE: - case CPU_DOWN_PREPARE: - cpuidle_coupled_prevent_idle(dev->coupled); - break; - case CPU_ONLINE: - case CPU_DEAD: - cpuidle_coupled_update_online_cpus(dev->coupled); - /* Fall through */ - case CPU_UP_CANCELED: - case CPU_DOWN_FAILED: - cpuidle_coupled_allow_idle(dev->coupled); - break; - } - + cpuidle_coupled_update_online_cpus(dev->coupled); + cpuidle_coupled_allow_idle(dev->coupled); out: mutex_unlock(&cpuidle_lock); - return NOTIFY_OK; + return 0; } -static struct notifier_block cpuidle_coupled_cpu_notifier = { - .notifier_call = cpuidle_coupled_cpu_notify, -}; +static int coupled_cpu_up_prepare(unsigned int cpu) +{ + struct cpuidle_device *dev; + + mutex_lock(&cpuidle_lock); + + dev = per_cpu(cpuidle_devices, cpu); + if (!dev || !dev->coupled) + goto out; + + cpuidle_coupled_prevent_idle(dev->coupled); +out: + mutex_unlock(&cpuidle_lock); + return 0; +} static int __init cpuidle_coupled_init(void) { - return register_cpu_notifier(&cpuidle_coupled_cpu_notifier); + int ret; + + ret = cpuhp_setup_state_nocalls(CPUHP_CPUIDLE_COUPLED_PREPARE, + "CPUIDLE_COUPLED_PREPARE", + coupled_cpu_up_prepare, + coupled_cpu_online); + if (ret) + goto err; + ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, + "CPUIDLE_COUPLED_ONLINE", + coupled_cpu_online, + coupled_cpu_up_prepare); + if (ret < 0) + goto err; + return 0; +err: + cpuhp_remove_state_nocalls(CPUHP_CPUIDLE_COUPLED_PREPARE); + return ret; } core_initcall(cpuidle_coupled_init); diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 6a08fd142b8c..9e50a7b3bbcd 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -31,6 +31,7 @@ enum cpuhp_state { CPUHP_SLAB_PREPARE, CPUHP_RCUTREE_PREP, CPUHP_MD_RAID5_PREPARE, + CPUHP_CPUIDLE_COUPLED_PREPARE, CPUHP_NOTIFY_PREPARE, CPUHP_TIMERS_DEAD, CPUHP_BRINGUP_CPU,