From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751672AbaJAHrX (ORCPT ); Wed, 1 Oct 2014 03:47:23 -0400 Received: from e31.co.us.ibm.com ([32.97.110.149]:40413 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751190AbaJAHrU (ORCPT ); Wed, 1 Oct 2014 03:47:20 -0400 From: "Shreyas B. Prabhu" To: linux-kernel@vger.kernel.org Cc: "Shreyas B. Prabhu" , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , "Srivatsa S. Bhat" , "Preeti U. Murthy" , Vaidyanathan Srinivasan , linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 0/5] Winkle support for offline cpus Date: Wed, 1 Oct 2014 13:16:52 +0530 Message-Id: <1412149617-3178-1-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: 14100107-8236-0000-0000-000005D308AE Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Powernv already has support for nap and sleep and these states are used by cpuidle framework. This patchset adds support for 'deep winkle' a deeper idle state. In deep winkle, entire chiplet (core/L2/L3) is power off, leading to higher power savings. But this results in hypervisor state loss. This patchset add the necessary infrastructure to recover from hypervisor state loss and enables offline cpus to use winkle. I've successfully tested subcore functionality with these patches. Particularly these two scenarios: Scenario 1: -> Set subcore-per-core to 4. -> Offline and online a complete core Check if core wakes up with 4 subcores Scenario 2. -> Set subcore-per-core to 1. -> Offline a core. -> set subcore-per-core to 4. -> Online a core Check if core wakes up with 4 subcores. In both these scenarios, the core wakes up with 4 subcores and can run guests on individual subcores. Note, these patches apply on top 'powernv/cpuidle: Fastsleep workaround and fixes' series. Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Srivatsa S. Bhat Cc: Preeti U. Murthy Cc: Vaidyanathan Srinivasan Cc: linuxppc-dev@lists.ozlabs.org v2: Rebased on 3.17-rc7 Split from 'powerpc/powernv: Support for fastsleep and winkle' v1: https://lkml.org/lkml/2014/8/25/446 Shreyas B. Prabhu (5): powerpc/powernv: Add OPAL call to save and restore powerpc: Adding macro for accessing Thread Switch Control Register powerpc/powernv: Add winkle infrastructure powerpc/powernv: Discover and enable winkle powerpc/powernv: Enter deepest supported idle state in offline arch/powerpc/include/asm/machdep.h | 1 + arch/powerpc/include/asm/opal.h | 3 + arch/powerpc/include/asm/paca.h | 3 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 2 + arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 4 +- arch/powerpc/kernel/idle.c | 11 +++ arch/powerpc/kernel/idle_power7.S | 81 ++++++++++++++++++++- arch/powerpc/platforms/powernv/opal-wrappers.S | 1 + arch/powerpc/platforms/powernv/powernv.h | 1 + arch/powerpc/platforms/powernv/setup.c | 99 ++++++++++++++++++++++++++ arch/powerpc/platforms/powernv/smp.c | 6 +- arch/powerpc/platforms/powernv/subcore.c | 15 ++++ 15 files changed, 226 insertions(+), 5 deletions(-) -- 1.9.3