From patchwork Tue Nov 24 22:25:34 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geoff Levand X-Patchwork-Id: 57276 Delivered-To: patch@linaro.org Received: by 10.112.155.196 with SMTP id vy4csp2391480lbb; Tue, 24 Nov 2015 14:57:00 -0800 (PST) X-Received: by 10.66.100.226 with SMTP id fb2mr46321969pab.16.1448405820666; Tue, 24 Nov 2015 14:57:00 -0800 (PST) Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org. [2001:1868:205::9]) by mx.google.com with ESMTPS id qu9si29359970pab.149.2015.11.24.14.57.00 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 24 Nov 2015 14:57:00 -0800 (PST) Received-SPF: pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) client-ip=2001:1868:205::9; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1a1MUt-0005Xz-VR; Tue, 24 Nov 2015 22:55:39 +0000 Received: from merlin.infradead.org ([2001:4978:20e::2]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1a1MU2-00045Y-HZ; Tue, 24 Nov 2015 22:54:46 +0000 Received: from geoff by merlin.infradead.org with local (Exim 4.85 #2 (Red Hat Linux)) id 1a1M1m-0007XI-Fa; Tue, 24 Nov 2015 22:25:34 +0000 Message-Id: <3c9bfb1df9bba481b753d8d630e4e3d45f986f04.1448403503.git.geoff@infradead.org> In-Reply-To: References: From: Geoff Levand Patch-Date: Wed, 19 Aug 2015 11:50:20 +0900 Subject: [PATCH v12 14/16] arm64: kdump: update a kernel doc To: Catalin Marinas , Will Deacon Date: Tue, 24 Nov 2015 22:25:34 +0000 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , marc.zyngier@arm.com, kexec@lists.infradead.org, AKASHI Takahiro , christoffer.dall@linaro.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org From: AKASHI Takahiro This patch adds arch specific descriptions about kdump usage on arm64 to kdump.txt. Signed-off-by: AKASHI Takahiro --- Documentation/kdump/kdump.txt | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) -- 2.5.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt index bc4bd5a..7d3fad0 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) 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 enabled on the dump-capture kernel even + if it is configured. + Extended crashkernel syntax =========================== @@ -312,6 +335,8 @@ 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]". Note that the start address of + the kernel, X if explicitly specified, must be aligned to 2MiB (0x200000). Load the Dump-capture Kernel ============================ @@ -334,6 +359,8 @@ 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 +404,9 @@ For s390x: For arm: "1 maxcpus=1 reset_devices" +For arm64: + "1 mem=X[MG] maxcpus=1 reset_devices" + Notes on loading the dump-capture kernel: * By default, the ELF headers are stored in ELF64 format to support