From patchwork Wed Feb 1 12:48:20 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 9549631 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 0B52160415 for ; Wed, 1 Feb 2017 12:47:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EC81228422 for ; Wed, 1 Feb 2017 12:47:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E139928437; Wed, 1 Feb 2017 12:47:29 +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=-1.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, T_DKIM_INVALID autolearn=no version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0A07728422 for ; Wed, 1 Feb 2017 12:47:29 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cYuJs-000409-P5; Wed, 01 Feb 2017 12:47:28 +0000 Received: from mail-pg0-x230.google.com ([2607:f8b0:400e:c05::230]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cYuJi-0003ni-7o for linux-arm-kernel@lists.infradead.org; Wed, 01 Feb 2017 12:47:25 +0000 Received: by mail-pg0-x230.google.com with SMTP id 14so109103743pgg.1 for ; Wed, 01 Feb 2017 04:46:58 -0800 (PST) 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=wCy1oA4FJqwEjNNSBfsy/wL1vp+hublTUwyYoXGlEJQ=; b=RU0kNC1/PpLeD2PK26gwg050msmyDoeaXSH6pXt409GEve1nRLbGWXaWi989wXZQqE 9fPsIKjH5dsEbUfQOgu9so1SIT/kYHfGztaNjRbhC84rZ66AOWoYbMALDApgOx81XAKg PDOgkDSB1GTmlrAMpc8D1/bMDwnyOM5fujJyY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=wCy1oA4FJqwEjNNSBfsy/wL1vp+hublTUwyYoXGlEJQ=; b=okeVuMuTUcQKWYpfBDlo5+lMa076logfjrEM3Fvyg7FSqNs+qV/lj1TKcWABDVxvsU oPOeqfVIpJbK5bY1YZHymeGZOn3ipascSAMIBJz8fystnpKHEcK/aqtenNq15TRYj8+o RBfSdYJKv1aic0gWrxDkfoRHSuFN+/TG6lApAGRiPZ/3UiIqeX4MQmxexslSeT4gWUYS PUiWwAgS7ivfyP3XwzwpdWCLqLYF1pTsxrN3kjwytoQm/UwIS5pSocmolGgQ16kcP08p 53g7/wfahR9aqeYZyfDiAdjKVZAva+1kCcMpIuECmRDxAJlGmTVKhiU5NWJnwIuB7J86 Ewfg== X-Gm-Message-State: AIkVDXIp1sQcHR/9d1jvcWpOxSuJO7ecG4w75bm8uVoKUr7eXxQQJ4UjAM0vLLY6UNOJFZVJ X-Received: by 10.84.224.134 with SMTP id s6mr4192794plj.49.1485953217527; Wed, 01 Feb 2017 04:46:57 -0800 (PST) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id h4sm49464574pfk.96.2017.02.01.04.46.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 01 Feb 2017 04:46:57 -0800 (PST) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, robh+dt@kernel.org, mark.rutland@arm.com Subject: [PATCH v31 12/12] Documentation: dt: chosen properties for arm64 kdump Date: Wed, 1 Feb 2017 21:48:20 +0900 Message-Id: <20170201124820.6094-1-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170201124218.5823-1-takahiro.akashi@linaro.org> References: <20170201124218.5823-1-takahiro.akashi@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170201_044718_391377_68BF168F X-CRM114-Status: GOOD ( 11.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 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 DT properties: linux,usable-memory-range linux,elfcorehdr used by arm64 kdump. Those decribe the usable memory range for crash dump kernel and the elfcorehdr's location within it, respectively. Signed-off-by: James Morse [takahiro.akashi@linaro.org: added "linux,crashkernel-base" and "-size" ] Signed-off-by: AKASHI Takahiro Acked-by: Mark Rutland Cc: devicetree@vger.kernel.org Cc: Rob Herring --- Documentation/devicetree/bindings/chosen.txt | 37 ++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt index 6ae9d82d4c37..8dc82431acc1 100644 --- a/Documentation/devicetree/bindings/chosen.txt +++ b/Documentation/devicetree/bindings/chosen.txt @@ -52,3 +52,40 @@ 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,usable-memory-range +------------------------- + +This property (arm64 only) holds a base address and size, describing a +limited region in which memory may be considered available for use by +the kernel. Memory outside of this range is not available for use. + +This property describes a limitation: memory within this range is only +valid when also described through another mechanism that the kernel +would otherwise use to determine available memory (e.g. memory nodes +or the EFI memory map). Valid memory may be sparse within the range. +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 as PT_LOAD segments of elf format. +e.g. + +/ { + chosen { + linux,elfcorehdr = <0x9 0xfffff000 0x0 0x800>; + }; +};