Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753665AbaKYLSj (ORCPT ); Tue, 25 Nov 2014 06:18:39 -0500 Received: from e9.ny.us.ibm.com ([32.97.182.139]:57419 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753593AbaKYLSh (ORCPT ); Tue, 25 Nov 2014 06:18:37 -0500 From: "Shreyas B. Prabhu" To: linux-kernel@vger.kernel.org Cc: "Shreyas B. Prabhu" , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , "Rafael J. Wysocki" , linux-pm@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Vaidyanathan Srinivasan , Preeti U Murthy Subject: [PATCH v2 0/4] powernv: cpuidle: Redesign idle states management Date: Tue, 25 Nov 2014 16:47:55 +0530 Message-Id: <1416914279-30384-1-git-send-email-shreyas@linux.vnet.ibm.com> X-Mailer: git-send-email 1.9.3 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14112511-0033-0000-0000-000001248C5A Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Deep idle states like sleep and winkle are per core idle states. A core enters these states only when all the threads enter either the particular idle state or a deeper one. There are tasks like fastsleep hardware bug workaround and hypervisor core state save which have to be done only by the last thread of the core entering deep idle state and similarly tasks like timebase resync, hypervisor core register restore that have to be done only by the first thread waking up from these states. The current idle state management does not have a way to distinguish the first/last thread of the core waking/entering idle states. Tasks like timebase resync are done for all the threads. This is not only is suboptimal, but can cause functionality issues when subcores are involved. Winkle is deeper idle state compared to fastsleep. In this state the power supply to the chiplet, i.e core, private L2 and private L3 is turned off. This results in a total hypervisor state loss. This patch set adds support for winkle and provides a way to track the idle states of the threads of the core and use it for idle state management of idle states sleep and winkle. Changes in v2: -------------- -Using PNV_THREAD_NAP/SLEEP defines while calling power7_powersave_common -Comment changes based on review -Rebased on top of 3.18-rc6 Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Rafael J. Wysocki Cc: linux-pm@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: Vaidyanathan Srinivasan Cc: Preeti U Murthy Paul Mackerras (1): powerpc: powernv: Switch off MMU before entering nap/sleep/rvwinkle mode Preeti U. Murthy (1): powerpc/powernv: Enable Offline CPUs to enter deep idle states Shreyas B. Prabhu (2): powernv: cpuidle: Redesign idle states management powernv: powerpc: Add winkle support for offline cpus arch/powerpc/include/asm/cpuidle.h | 14 ++ arch/powerpc/include/asm/opal.h | 13 + arch/powerpc/include/asm/paca.h | 6 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 1 + arch/powerpc/include/asm/reg.h | 4 + arch/powerpc/kernel/asm-offsets.c | 6 + arch/powerpc/kernel/cpu_setup_power.S | 4 + arch/powerpc/kernel/exceptions-64s.S | 30 ++- arch/powerpc/kernel/idle_power7.S | 332 +++++++++++++++++++++---- arch/powerpc/platforms/powernv/opal-wrappers.S | 39 +++ arch/powerpc/platforms/powernv/powernv.h | 2 + arch/powerpc/platforms/powernv/setup.c | 160 ++++++++++++ arch/powerpc/platforms/powernv/smp.c | 10 +- arch/powerpc/platforms/powernv/subcore.c | 34 +++ arch/powerpc/platforms/powernv/subcore.h | 1 + drivers/cpuidle/cpuidle-powernv.c | 10 +- 17 files changed, 608 insertions(+), 60 deletions(-) create mode 100644 arch/powerpc/include/asm/cpuidle.h -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/