From patchwork Tue Aug 9 01:57:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 9270069 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 683C4607D6 for ; Tue, 9 Aug 2016 01:56:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 57135280CF for ; Tue, 9 Aug 2016 01:56:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 47DC8281A7; Tue, 9 Aug 2016 01:56:14 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C0C49280CF for ; Tue, 9 Aug 2016 01:56:13 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bWwFg-0006PJ-IR; Tue, 09 Aug 2016 01:54:44 +0000 Received: from mail-pa0-x232.google.com ([2607:f8b0:400e:c03::232]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bWwDU-0004OK-GR for linux-arm-kernel@lists.infradead.org; Tue, 09 Aug 2016 01:52:39 +0000 Received: by mail-pa0-x232.google.com with SMTP id fi15so159368pac.1 for ; Mon, 08 Aug 2016 18:52:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=vlsdDd7rnuyKOZQz1hJSb8nGV8er6Vv/y1hRa1MIFvo=; b=VSi2vDl6ePjvalVRqi2gAv5+Qx0C/2U69TnX+1D/pcFTM0UTbQrZ/ARorCMGczFUON hZVGvoL3jTe6prDUhBOYsgfVq3uNHy1HOipoHUsOVEB0fQU6YULGlEuHYxr2/mZ5Ilg5 pTSPgLKg2u5eGJanFaWoJ6SXiibok6OWuKKyI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=vlsdDd7rnuyKOZQz1hJSb8nGV8er6Vv/y1hRa1MIFvo=; b=mh2mgQKehGvMfKRex5IdZRx+eRKuUaPzUSTeNWR/lLwDHUqu2R+C04b3xpDx/HbOBo +DcJ3LxJ1vLoGb4a8XkMX0dvVDM4alfj6BPSHSpl9qTw4Ms+W1LSYg5qllVHU+x+tmM1 Hqa1mWbVGHlTDyENNqmegAawYoPCWAiZZyLEmwbp/wR1Z+cBbIyY8+5bbjqaCMP6ZO6d wkYi5utv3VdIC54A5ImcsUegQHmW1S3fWWQvREQjqM8s31+0zohGo7fjKk/iEz0Q1oQl X/YuiGOR0Eoj2yFpurC3k9TMKl7S/CoJGdGeV/4H21dy8TwaOWkLsGqSUnL6OlZgh7av QZ9w== X-Gm-Message-State: AEkoouvo52uxLdM645eisA0B/OnmG/CkEitvXGr9kBde+VlpStKReWMYkS090UlBnPOfAoDK X-Received: by 10.66.242.166 with SMTP id wr6mr167559357pac.147.1470707527652; Mon, 08 Aug 2016 18:52:07 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id e187sm50957040pfg.43.2016.08.08.18.52.06 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Mon, 08 Aug 2016 18:52:07 -0700 (PDT) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, robh+dt@kernel.org, frowand.list@gmail.com Subject: [PATCH v24 9/9] Documentation: dt: chosen properties for arm64 kdump Date: Tue, 9 Aug 2016 10:57:47 +0900 Message-Id: <20160809015747.28591-1-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.9.0 In-Reply-To: <20160809015248.28414-2-takahiro.akashi@linaro.org> References: <20160809015248.28414-2-takahiro.akashi@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160808_185228_961879_F6CA0566 X-CRM114-Status: GOOD ( 10.86 ) 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@arm.com, devicetree@vger.kernel.org, geoff@infradead.org, kexec@lists.infradead.org, AKASHI Takahiro , james.morse@arm.com, bauerman@linux.vnet.ibm.com, dyoung@redhat.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: James Morse Add documentation for linux,crashkernel-base and crashkernel-size, linux,usable-memory-range, and linux,elfcorehdr used by arm64 kexec/kdump to decribe the kdump reserved area, and the elfcorehdr's location within it. Signed-off-by: James Morse [takahiro.akashi@linaro.org: renamed "usable-memory" to "usable-memory-range", added "linux,crashkernel-base" and "-size" ] Signed-off-by: AKASHI Takahiro --- Documentation/devicetree/bindings/chosen.txt | 50 ++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt index 6ae9d82..236188a 100644 --- a/Documentation/devicetree/bindings/chosen.txt +++ b/Documentation/devicetree/bindings/chosen.txt @@ -52,3 +52,53 @@ This property is set (currently only on PowerPC, and only needed on book3e) by some versions of kexec-tools to tell the new kernel that it is being booted by kexec, as the booting environment may differ (e.g. a different secondary CPU release mechanism) + +linux,crashkernel-base +linux,crashkernel-size +---------------------- +These properties (currently used on PowerPC and arm64) indicates +the base address and the size, respectively, of the reserved memory +range for crash dump kernel. +e.g. + +/ { + chosen { + linux,crashkernel-base = <0x9 0xf0000000>; + linux,crashkernel-size = <0x0 0x10000000>; + }; +}; + +linux,usable-memory-range +------------------------- + +This property (currently used only on arm64) holds the memory range, +the base address and the size, which can be used as system ram on +the *current* kernel. Note that, if this property is present, any memory +regions under "memory" nodes in DT blob or ones marked as "conventional +memory" in EFI memory map should be ignored. +e.g. + +/ { + chosen { + linux,usable-memory-range = <0x9 0xf0000000 0x0 0x10000000>; + }; +}; + +The main usage is for crash dump kernel to identify its own usable +memory and exclude, at its boot time, any other memory areas that are +part of the panicked kernel's memory. + +linux,elfcorehdr +---------------- + +This property (currently used only on arm64) holds the memory range, +the address and the size, of the elf core header which mainly describes +the panicked kernel's memory layout in elf format. +e.g. + +/ { + chosen { + linux,usable-memory-range = <0x9 0xf0000000 0x0 0x10000000>; + linux,elfcorehdr = <0x9 0xfffff000 0x0 0x800>; + }; +};