From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753885Ab0BIIdf (ORCPT ); Tue, 9 Feb 2010 03:33:35 -0500 Received: from e23smtp09.au.ibm.com ([202.81.31.142]:54758 "EHLO e23smtp09.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753570Ab0BIIde (ORCPT ); Tue, 9 Feb 2010 03:33:34 -0500 Date: Tue, 9 Feb 2010 14:03:26 +0530 From: Arun R Bharadwaj To: Peter Zijlstra , Benjamin Herrenschmidt , Ingo Molnar , Vaidyanathan Srinivasan , Dipankar Sarma , Balbir Singh , Venkatesh Pallipadi Cc: linux-kernel@vger.kernel.org, Arun Bharadwaj Subject: [v11 PATCH 5/9]: POWER: enable cpuidle for POWER. Message-ID: <20100209083326.GF29988@linux.vnet.ibm.com> Reply-To: arun@linux.vnet.ibm.com References: <20100209082815.GA29988@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20100209082815.GA29988@linux.vnet.ibm.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Arun R Bharadwaj [2010-02-09 13:58:16]: This patch enables the cpuidle option in Kconfig for pSeries. Currently cpuidle infrastructure is enabled only for x86 and ARM. This code is almost completely borrowed from x86 to enable cpuidle for pSeries. Signed-off-by: Arun R Bharadwaj --- arch/powerpc/Kconfig | 9 +++++++++ arch/powerpc/include/asm/system.h | 2 ++ arch/powerpc/kernel/idle.c | 19 +++++++++++++++++++ 3 files changed, 30 insertions(+) Index: linux.trees.git/arch/powerpc/Kconfig =================================================================== --- linux.trees.git.orig/arch/powerpc/Kconfig +++ linux.trees.git/arch/powerpc/Kconfig @@ -101,6 +101,9 @@ config ARCH_HAS_ILOG2_U64 bool default y if 64BIT +config ARCH_HAS_CPU_IDLE_WAIT + def_bool y + config GENERIC_HWEIGHT bool default y @@ -247,6 +250,12 @@ source "kernel/Kconfig.freezer" source "arch/powerpc/sysdev/Kconfig" source "arch/powerpc/platforms/Kconfig" +menu "Power management options" + +source "drivers/cpuidle/Kconfig" + +endmenu + menu "Kernel options" config HIGHMEM Index: linux.trees.git/arch/powerpc/include/asm/system.h =================================================================== --- linux.trees.git.orig/arch/powerpc/include/asm/system.h +++ linux.trees.git/arch/powerpc/include/asm/system.h @@ -546,5 +546,7 @@ extern void account_system_vtime(struct extern struct dentry *powerpc_debugfs_root; +void cpu_idle_wait(void); + #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_SYSTEM_H */ Index: linux.trees.git/arch/powerpc/kernel/idle.c =================================================================== --- linux.trees.git.orig/arch/powerpc/kernel/idle.c +++ linux.trees.git/arch/powerpc/kernel/idle.c @@ -102,6 +102,25 @@ void cpu_idle(void) } } +static void do_nothing(void *unused) +{ +} + +/* + * cpu_idle_wait - Used to ensure that all the CPUs come out of the old + * idle loop and start using the new idle loop. + * Required while changing idle handler on SMP systems. + * Caller must have changed idle handler to the new value before the call. + */ +void cpu_idle_wait(void) +{ + /* Ensure that new value of idle is set */ + smp_mb(); + /* kick all the CPUs so that they exit out of old idle routine */ + smp_call_function(do_nothing, NULL, 1); +} +EXPORT_SYMBOL_GPL(cpu_idle_wait); + int powersave_nap; #ifdef CONFIG_SYSCTL