From patchwork Fri Apr 24 07:53:07 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 47553 Return-Path: X-Original-To: linaro@patches.linaro.org Delivered-To: linaro@patches.linaro.org Received: from mail-wi0-f199.google.com (mail-wi0-f199.google.com [209.85.212.199]) by ip-10-151-82-157.ec2.internal (Postfix) with ESMTPS id 4F73F21550 for ; Fri, 24 Apr 2015 07:54:34 +0000 (UTC) Received: by wizk4 with SMTP id k4sf2217339wiz.2 for ; Fri, 24 Apr 2015 00:54:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:delivered-to:from:to:cc:subject :date:message-id:in-reply-to:references:sender:precedence:list-id :x-original-sender:x-original-authentication-results:mailing-list :list-post:list-help:list-archive:list-unsubscribe; bh=XZjjiOJzGiOwiETSBkiiX5AiurjBvzngDo3iXpUvWyY=; b=QP0hn+DRp72CI2Sz0u2AunXs57Twr5r6miMoI8vb+fO8CO9S6H+o3mnsHjPUCzTpMa QWZ/ik29m+gGzXCxxzqAIzTmiyxXadzcEpJ/z5QSaB/tP01fLpJ1WeDfM62aJMvPcqs5 SfWmHZ2sB19ElyioSTdFpttsiq3ry6JpyJrM8cAfSdCairu+LualBaS2s0ci8fsjftei qtgLTDhbytV0iuPmTyPebOKzQ8cFgBHaGu+qnp4/Cbvl5hInx/vwDTTgG9BzVFC/Pdet ZpBnVgyJRpxuc9mcafui3URH6Z+z8hnXEEiQuV+lzKTzeJSkk8gNItoVNwmm2OpTbv8Q saZA== X-Gm-Message-State: ALoCoQnzMvyOB113jpd7fI31IenvfOmSiGdr6g/fKAyvSTCJ/+RjelQWwan16QlQPaOX+wq3Me+Y X-Received: by 10.180.98.130 with SMTP id ei2mr458844wib.0.1429862073560; Fri, 24 Apr 2015 00:54:33 -0700 (PDT) MIME-Version: 1.0 X-BeenThere: patchwork-forward@linaro.org Received: by 10.152.5.131 with SMTP id s3ls414060las.65.gmail; Fri, 24 Apr 2015 00:54:33 -0700 (PDT) X-Received: by 10.152.36.73 with SMTP id o9mr5778810laj.48.1429862073204; Fri, 24 Apr 2015 00:54:33 -0700 (PDT) Received: from mail-lb0-f170.google.com (mail-lb0-f170.google.com. [209.85.217.170]) by mx.google.com with ESMTPS id m5si7667146laj.177.2015.04.24.00.54.33 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 24 Apr 2015 00:54:33 -0700 (PDT) Received-SPF: pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.170 as permitted sender) client-ip=209.85.217.170; Received: by lbbqq2 with SMTP id qq2so30541947lbb.3 for ; Fri, 24 Apr 2015 00:54:33 -0700 (PDT) X-Received: by 10.112.219.70 with SMTP id pm6mr5746884lbc.41.1429862073086; Fri, 24 Apr 2015 00:54:33 -0700 (PDT) X-Forwarded-To: patchwork-forward@linaro.org X-Forwarded-For: patch@linaro.org patchwork-forward@linaro.org Delivered-To: patch@linaro.org Received: by 10.112.67.65 with SMTP id l1csp1032518lbt; Fri, 24 Apr 2015 00:54:32 -0700 (PDT) X-Received: by 10.66.220.5 with SMTP id ps5mr12793112pac.16.1429862071167; Fri, 24 Apr 2015 00:54:31 -0700 (PDT) Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id ag7si16291971pad.120.2015.04.24.00.54.29; Fri, 24 Apr 2015 00:54:31 -0700 (PDT) Received-SPF: none (google.com: linux-kernel-owner@vger.kernel.org does not designate permitted sender hosts) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755395AbbDXHy2 (ORCPT + 27 others); Fri, 24 Apr 2015 03:54:28 -0400 Received: from mail-pa0-f52.google.com ([209.85.220.52]:35834 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755366AbbDXHyU (ORCPT ); Fri, 24 Apr 2015 03:54:20 -0400 Received: by pabtp1 with SMTP id tp1so41673736pab.2 for ; Fri, 24 Apr 2015 00:54:19 -0700 (PDT) X-Received: by 10.66.154.162 with SMTP id vp2mr12369503pab.73.1429862058988; Fri, 24 Apr 2015 00:54:18 -0700 (PDT) Received: from localhost.localdomain (61-205-1-167m5.grp1.mineo.jp. [61.205.1.167]) by mx.google.com with ESMTPSA id ry2sm10154199pbb.83.2015.04.24.00.54.13 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 24 Apr 2015 00:54:17 -0700 (PDT) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, vgoyal@redhat.com, hbabus@us.ibm.com Cc: geoff@infradead.org, broonie@kernel.org, david.griego@linaro.org, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linaro-kernel@lists.linaro.org, linux-kernel@vger.kernel.org, AKASHI Takahiro Subject: [v2 4/5] arm64: add kdump support Date: Fri, 24 Apr 2015 16:53:07 +0900 Message-Id: <1429861989-8417-5-git-send-email-takahiro.akashi@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1429861989-8417-1-git-send-email-takahiro.akashi@linaro.org> References: <1429861989-8417-1-git-send-email-takahiro.akashi@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: takahiro.akashi@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.170 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , Please read the following commits for arm64-specific constraints: arm64: kdump: reserve memory for crash dump kernel arm64: kdump: do not go into EL2 before starting a crash dump kernel Signed-off-by: AKASHI Takahiro --- Documentation/kdump/kdump.txt | 31 ++++++++++++++++++++++++++++++- arch/arm64/Kconfig | 12 ++++++++++++ 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt index bc4bd5a..f9cf6f5 100644 --- a/Documentation/kdump/kdump.txt +++ b/Documentation/kdump/kdump.txt @@ -18,7 +18,7 @@ memory image to a dump file on the local disk, or across the network to a remote system. Kdump and kexec are currently supported on the x86, x86_64, ppc64, ia64, -s390x and arm architectures. +s390x, arm and arm64 architectures. When the system kernel boots, it reserves a small section of memory for the dump-capture kernel. This ensures that ongoing Direct Memory Access @@ -249,6 +249,29 @@ Dump-capture kernel config options (Arch Dependent, arm) AUTO_ZRELADDR=y +Dump-capture kernel config options (Arch Dependent, arm64) +---------------------------------------------------------- + +1) Disable symmetric multi-processing support under "Processor type and + features": + + CONFIG_SMP=n + + (If CONFIG_SMP=y, then specify maxcpus=1 on the kernel command line + when loading the dump-capture kernel, see section "Load the Dump-capture + Kernel".) + +2) Under uefi, the maximum memory size on the dump-capture kernel must be + limited by specifying: + + mem=X[MG] + + where X should be less than or equal to the size in "crashkernel=" + boot parameter. Kexec-tools will automatically add this. + +3) Currently, kvm will not be initialized on the dump-capture kernel even + if it is configured. + Extended crashkernel syntax =========================== @@ -312,6 +335,7 @@ Boot into System Kernel any space below the alignment point may be overwritten by the dump-capture kernel, which means it is possible that the vmcore is not that precise as expected. + On arm64, use "crashkernel=Y@X". Load the Dump-capture Kernel ============================ @@ -334,6 +358,8 @@ For s390x: - Use image or bzImage For arm: - Use zImage +For arm64: + - Use vmlinux If you are using a uncompressed vmlinux image then use following command to load dump-capture kernel. @@ -377,6 +403,9 @@ For s390x: For arm: "1 maxcpus=1 reset_devices" +For arm64: + "1 maxcpus=1 mem=X[MG] reset_devices" + Notes on loading the dump-capture kernel: * By default, the ELF headers are stored in ELF64 format to support diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 5716edf..8e2f545 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -562,6 +562,18 @@ config KEXEC but it is independent of the system firmware. And like a reboot you can start any kernel with it, not just Linux. +config CRASH_DUMP + bool "Build kdump crash kernel" + help + Generate crash dump after being started by kexec. This should + be normally only set in special crash dump kernels which are + loaded in the main kernel with kexec-tools into a specially + reserved region and then later executed after a crash by + kdump/kexec. The crash dump kernel must be compiled to a + memory address not used by the main kernel. + + For more details see Documentation/kdump/kdump.txt + config XEN_DOM0 def_bool y depends on XEN