From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp07.in.ibm.com (e28smtp07.in.ibm.com [122.248.162.7]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e28smtp07.in.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id E2638B71C0 for ; Thu, 17 Nov 2011 23:26:18 +1100 (EST) Received: from /spool/local by e28smtp07.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 17 Nov 2011 17:03:44 +0530 Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id pAHBSQbx4595716 for ; Thu, 17 Nov 2011 16:58:27 +0530 Received: from d28av01.in.ibm.com (loopback [127.0.0.1]) by d28av01.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id pAHBSQsr008841 for ; Thu, 17 Nov 2011 16:58:26 +0530 Subject: [RFC PATCH v2 0/4] cpuidle: (POWER) cpuidle driver for pSeries To: linuxppc-dev@ozlabs.org, linux-pm@lists.linux-foundation.org, linux-pm@vger.kernel.org From: Deepthi Dharwar Date: Thu, 17 Nov 2011 16:58:25 +0530 Message-ID: <20111117112815.9191.2322.stgit@localhost6.localdomain6> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: linux-kernel@vger.kernel.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This patch series ports the cpuidle framework for ppc64 platform and implements a cpuidle back-end driver for ppc64 (pSeries) platform. Currently idle states are managed by pseries_{dedicated,shared}_idle_sleep() routines in arch/powerpc/platforms/pseries/setup.c. There are two idle states (snooze and cede) that are exploited by these routines based on simple heuristics. Moving the idle states over to cpuidle framework can take advantage of the advanced heuristics, tunables, and features provided by cpuidle framework. Additional idle states like extended cede with hints would be included and exploited using the cpuidle framework. The statistics and tracing infrastructure provided by the cpuidle framework also helps in enabling power management related tools and help tune the system and applications. This series aims to maintain compatibility and functionality to existing pSeries idle cpu management code. There are no new functions or idle states added as part of this series. The previous version of this patch can be found at https://lkml.org/lkml/2011/6/7/375 Changes from the previous version (v1): 1] Rebased to latest 3.2-rc2 2] Incorporated the changes from the feedback provided by Ben in the previous version of this series. 3] The first three patches in this series posted in v1 are not re-posted as they were taken from "idle cleanup - v3" posted by Len Brown (https://lkml.org/lkml/2011/4/2/8) which have made to the mainline in 3.1. This cleanup was a community requirement and major dependency before cpuidle framework can be ported over to powerpc architecture. This patch series includes: [1/4] - Provides arch specific cpu_idle_wait() function required by cpuidle subsystem. [2/4] - pseries_idle cpuidle driver [3/4] - Enables cpuidle for pSeries and directly calls cpuidle_idle_call() [4/4] - Handles powersave=off kernel boot parameter and disables registration of pseries_idle cpuidle driver. This series has been tested on ppc64 pSeries POWER7 system with the snooze and cede states -- arch/powerpc/Kconfig | 4 arch/powerpc/include/asm/processor.h | 3 arch/powerpc/include/asm/system.h | 9 + arch/powerpc/kernel/idle.c | 26 ++ arch/powerpc/kernel/sysfs.c | 2 arch/powerpc/platforms/Kconfig | 6 arch/powerpc/platforms/pseries/Kconfig | 9 + arch/powerpc/platforms/pseries/Makefile | 1 arch/powerpc/platforms/pseries/processor_idle.c | 321 +++++++++++++++++++++++ arch/powerpc/platforms/pseries/pseries.h | 3 arch/powerpc/platforms/pseries/setup.c | 89 ------ arch/powerpc/platforms/pseries/smp.c | 1 include/linux/cpuidle.h | 2 13 files changed, 387 insertions(+), 89 deletions(-) create mode 100644 arch/powerpc/platforms/pseries/processor_idle.c -Deepthi