From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3wRrkQ0NMWzDqc2 for ; Tue, 16 May 2017 18:50:21 +1000 (AEST) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v4G8mkgk027094 for ; Tue, 16 May 2017 04:50:11 -0400 Received: from e17.ny.us.ibm.com (e17.ny.us.ibm.com [129.33.205.207]) by mx0a-001b2d01.pphosted.com with ESMTP id 2afwhj21vf-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 16 May 2017 04:50:11 -0400 Received: from localhost by e17.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 16 May 2017 04:50:08 -0400 From: "Gautham R. Shenoy" To: Nicholas Piggin , Michael Ellerman , Michael Neuling , Vaidyanathan Srinivasan , Shilpasri G Bhat , Akshay Adiga , Benjamin Herrenschmidt Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, "Gautham R. Shenoy" Subject: [PATCH 0/6] Enable support for deep-stop states on POWER9 Date: Tue, 16 May 2017 14:19:42 +0530 Message-Id: List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: "Gautham R. Shenoy" Hi, This patch series contains some of the fixes required for enabling support for deep stop states such as STOP4 and STOP11 via CPU-Hotplug. These fixes mainly ensure that some of the hypervisor resources which are lost during the deep stop state are correctly restored on a wakeup. There are 6 patches in the series. Patch 1 correctly initializes the core_idle_state_ptr based on the threads_per_core. core_idle_state_ptr is used to determine if a thread is the last thread entering a deep stop state or a first thread waking up from deep stop state in order to save/restore per-core resources. Patch 2 decouples restoring timebase from restoring hypervisor resources, as there are stop states which lose hypervisor state but not the timebase. Patch 3 saves the LPCR value before executing deep stop and restores it back to the saved value on the wakeup from stop. Patch 4 programs the restoration of some of one-time initialized SPRs via the stop-api. Patch 5 provides a workaround for a hardware issue on POWER9 DD1 chips where the PLS value cannot be relied upon on a wakeup from deep stop. Patch 6 fixes the cpuidle-powernv initialization code to allow deep states that don't lose timebase. These patches are based on the Linux upstream and have been tested with the corresponding skiboot patches in https://lists.ozlabs.org/pipermail/skiboot/2017-May/007183.html to get STOP4 working via CPU-Hotplug. Akshay Adiga (1): powernv:idle: Restore SPRs for deep idle states via stop API. Gautham R. Shenoy (5): powernv:idle: Correctly initialize core_idle_state_ptr powernv:idle: Decouple Timebase restore & Per-core SPRs restore powernv:idle: Restore LPCR on wakeup from deep-stop powernv:idle: Use Requested Level for restoring state on P9 DD1 cpuidle-powernv: Allow Deep stop states that don't stop time arch/powerpc/include/asm/paca.h | 2 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/idle_book3s.S | 33 +++++++--- arch/powerpc/platforms/powernv/idle.c | 112 +++++++++++++++++++++------------- drivers/cpuidle/cpuidle-powernv.c | 16 +++-- 5 files changed, 110 insertions(+), 54 deletions(-) -- 1.8.3.1