From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BEC06C4346E for ; Thu, 24 Sep 2020 04:54:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86FA723899 for ; Thu, 24 Sep 2020 04:54:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726768AbgIXEys (ORCPT ); Thu, 24 Sep 2020 00:54:48 -0400 Received: from mgwym03.jp.fujitsu.com ([211.128.242.42]:62677 "EHLO mgwym03.jp.fujitsu.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726466AbgIXEyr (ORCPT ); Thu, 24 Sep 2020 00:54:47 -0400 X-Greylist: delayed 663 seconds by postgrey-1.27 at vger.kernel.org; Thu, 24 Sep 2020 00:54:46 EDT Received: from yt-mxoi1.gw.nic.fujitsu.com (unknown [192.168.229.67]) by mgwym03.jp.fujitsu.com with smtp id 2783_2cfd_64562af8_ea9a_4753_b429_e475f2a5d975; Thu, 24 Sep 2020 13:43:38 +0900 Received: from pumpkin.openstacklocal (pumpkin.fct.css.fujitsu.com [10.130.70.189]) by yt-mxoi1.gw.nic.fujitsu.com (Postfix) with ESMTP id 935C3AC0111 for ; Thu, 24 Sep 2020 13:43:37 +0900 (JST) Received: by pumpkin.openstacklocal (Postfix, from userid 1016) id E760C1C014; Thu, 24 Sep 2020 13:42:38 +0900 (JST) From: Yuichi Ito To: maz@kernel.org, sumit.garg@linaro.org, tglx@linutronix.de, jason@lakedaemon.net, catalin.marinas@arm.com, will@kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Yuichi Ito Subject: [PATCH 0/2] Enable support IPI_CPU_CRASH_STOP to be pseudo-NMI Date: Thu, 24 Sep 2020 13:42:34 +0900 Message-Id: <20200924044236.1245808-1-ito-yuichi@fujitsu.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Enable support IPI_CPU_CRASH_STOP to be pseudo-NMI This patchset enables IPI_CPU_CRASH_STOP IPI to be pseudo-NMI. This allows kdump to collect system information even when the CPU is in a HARDLOCKUP state. Only IPI_CPU_CRASH_STOP uses NMI and the other IPIs remain normal IRQs. The patch has been tested on ThunderX. This patch assumes Marc's latest IPIs patch-set. [1] It also uses some of Sumit's IPI patch set for NMI.[2] [1] https://lore.kernel.org/linux-arm-kernel/20200901144324.1071694-1-maz@kernel.org/ [2] https://lore.kernel.org/linux-arm-kernel/1599830924-13990-3-git-send-email-sumit.garg@linaro.org/ $ echo 1 > /proc/sys/kernel/panic_on_rcu_stal $ echo HARDLOCKUP > /sys/kernel/debug/provoke-crash/DIRECT : kernel panics and crash kernel boot : makedumpfile saves the system state at HARDLOCKUP in vmcore. crash utility: crash> bt PID: 3213 TASK: fffffd001adc5940 CPU: 8 COMMAND: "bash" #0 [fffffe0022fefcf0] lkdtm_HARDLOCKUP at fffffe0010888ab4 #1 [fffffe0022fefd10] lkdtm_do_action at fffffe00108882bc #2 [fffffe0022fefd20] direct_entry at fffffe0010888720 #3 [fffffe0022fefd70] full_proxy_write at fffffe001058cfe4 #4 [fffffe0022fefdb0] vfs_write at fffffe00104a4c2c #5 [fffffe0022fefdf0] ksys_write at fffffe00104a4f0c #6 [fffffe0022fefe40] __arm64_sys_write at fffffe00104a4fbc #7 [fffffe0022fefe50] el0_svc_common.constprop.0 at fffffe0010159e38 #8 [fffffe0022fefe80] do_el0_svc at fffffe0010159fa0 #9 [fffffe0022fefe90] el0_svc at fffffe00101481d0 #10 [fffffe0022fefea0] el0_sync_handler at fffffe00101484b4 #11 [fffffe0022fefff0] el0_sync at fffffe0010142b7c Sumit Garg (1): irqchip/gic-v3: Enable support for SGIs to act as NMIs Yuichi Ito (1): Register IPI_CPU_CRASH_STOP IPI as pseudo-NMI arch/arm64/kernel/smp.c | 39 ++++++++++++++++++++++++++++-------- drivers/irqchip/irq-gic-v3.c | 13 ++++++++++-- 2 files changed, 42 insertions(+), 10 deletions(-) -- 2.25.1