From patchwork Thu Jun 13 22:45:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marcelo Tosatti X-Patchwork-Id: 10993787 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AEB3014DB for ; Thu, 13 Jun 2019 22:55:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A1E0A26CFF for ; Thu, 13 Jun 2019 22:55:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 95D05274D1; Thu, 13 Jun 2019 22:55:19 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 29B9D271CB for ; Thu, 13 Jun 2019 22:55:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727418AbfFMWzQ (ORCPT ); Thu, 13 Jun 2019 18:55:16 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60298 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727112AbfFMWzQ (ORCPT ); Thu, 13 Jun 2019 18:55:16 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 77F603091782; Thu, 13 Jun 2019 22:55:15 +0000 (UTC) Received: from amt.cnet (ovpn-112-4.gru2.redhat.com [10.97.112.4]) by smtp.corp.redhat.com (Postfix) with ESMTP id E145652FCE; Thu, 13 Jun 2019 22:55:14 +0000 (UTC) Received: from amt.cnet (localhost [127.0.0.1]) by amt.cnet (Postfix) with ESMTP id 81612105182; Thu, 13 Jun 2019 19:53:03 -0300 (BRT) Received: (from marcelo@localhost) by amt.cnet (8.14.7/8.14.7/Submit) id x5DMr3vx025932; Thu, 13 Jun 2019 19:53:03 -0300 Message-ID: <20190613225022.932697232@redhat.com> User-Agent: quilt/0.66 Date: Thu, 13 Jun 2019 18:45:33 -0400 From: Marcelo Tosatti To: kvm-devel Cc: Paolo Bonzini , Radim Krcmar , Andrea Arcangeli , "Rafael J. Wysocki" , Peter Zijlstra , Wanpeng Li , Konrad Rzeszutek Wilk , Raslan KarimAllah , Boris Ostrovsky , Ankur Arora , Christian Borntraeger , linux-pm@vger.kernel.org, Marcelo Tosatti Subject: [patch 1/5] drivers/cpuidle: add cpuidle-haltpoll driver References: <20190613224532.949768676@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Thu, 13 Jun 2019 22:55:15 +0000 (UTC) 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 Add a cpuidle driver that calls the architecture default_idle routine. To be used in conjunction with the haltpoll governor. Signed-off-by: Marcelo Tosatti --- arch/x86/kernel/process.c | 2 - drivers/cpuidle/Kconfig | 9 +++++ drivers/cpuidle/Makefile | 1 drivers/cpuidle/cpuidle-haltpoll.c | 65 +++++++++++++++++++++++++++++++++++++ 4 files changed, 76 insertions(+), 1 deletion(-) Index: linux-2.6.git/arch/x86/kernel/process.c =================================================================== --- linux-2.6.git.orig/arch/x86/kernel/process.c 2019-06-13 16:19:27.877064340 -0400 +++ linux-2.6.git/arch/x86/kernel/process.c 2019-06-13 16:19:48.795544892 -0400 @@ -580,7 +580,7 @@ safe_halt(); trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id()); } -#ifdef CONFIG_APM_MODULE +#if defined(CONFIG_APM_MODULE) || defined(CONFIG_HALTPOLL_CPUIDLE_MODULE) EXPORT_SYMBOL(default_idle); #endif Index: linux-2.6.git/drivers/cpuidle/Kconfig =================================================================== --- linux-2.6.git.orig/drivers/cpuidle/Kconfig 2019-06-13 16:19:27.878064316 -0400 +++ linux-2.6.git/drivers/cpuidle/Kconfig 2019-06-13 18:41:40.599912671 -0400 @@ -51,6 +51,15 @@ source "drivers/cpuidle/Kconfig.powerpc" endmenu +config HALTPOLL_CPUIDLE + tristate "Halt poll cpuidle driver" + depends on X86 + default y + help + This option enables halt poll cpuidle driver, which allows to poll + before halting in the guest (more efficient than polling in the + host via halt_poll_ns for some scenarios). + endif config ARCH_NEEDS_CPU_IDLE_COUPLED Index: linux-2.6.git/drivers/cpuidle/Makefile =================================================================== --- linux-2.6.git.orig/drivers/cpuidle/Makefile 2019-06-13 16:19:27.878064316 -0400 +++ linux-2.6.git/drivers/cpuidle/Makefile 2019-06-13 16:19:48.796544867 -0400 @@ -7,6 +7,7 @@ obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o obj-$(CONFIG_DT_IDLE_STATES) += dt_idle_states.o obj-$(CONFIG_ARCH_HAS_CPU_RELAX) += poll_state.o +obj-$(CONFIG_HALTPOLL_CPUIDLE) += cpuidle-haltpoll.o ################################################################################## # ARM SoC drivers Index: linux-2.6.git/drivers/cpuidle/cpuidle-haltpoll.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.git/drivers/cpuidle/cpuidle-haltpoll.c 2019-06-13 18:41:39.305933413 -0400 @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * cpuidle driver for haltpoll governor. + * + * Copyright 2019 Red Hat, Inc. and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + * Authors: Marcelo Tosatti + */ + +#include +#include +#include +#include + +static int default_enter_idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + if (current_clr_polling_and_test()) { + local_irq_enable(); + return index; + } + default_idle(); + return index; +} + +static struct cpuidle_driver haltpoll_driver = { + .name = "haltpoll", + .owner = THIS_MODULE, + .states = { + { /* entry 0 is for polling */ }, + { + .enter = default_enter_idle, + .exit_latency = 0, + .target_residency = 0, + .power_usage = -1, + .name = "haltpoll idle", + .desc = "default architecture idle", + }, + }, + .safe_state_index = 0, + .state_count = 2, +}; + +static int __init haltpoll_init(void) +{ + struct cpuidle_driver *drv = &haltpoll_driver; + + cpuidle_poll_state_init(drv); + + return cpuidle_register(&haltpoll_driver, NULL); +} + +static void __exit haltpoll_exit(void) +{ + cpuidle_unregister(&haltpoll_driver); +} + +module_init(haltpoll_init); +module_exit(haltpoll_exit); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Marcelo Tosatti "); +