From patchwork Mon Apr 3 02:26:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 96589 Delivered-To: patch@linaro.org Received: by 10.140.89.233 with SMTP id v96csp1685379qgd; Sun, 2 Apr 2017 19:23:03 -0700 (PDT) X-Received: by 10.84.248.9 with SMTP id p9mr18668525pll.185.1491186183562; Sun, 02 Apr 2017 19:23:03 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id k10si12631212pfg.293.2017.04.02.19.23.03; Sun, 02 Apr 2017 19:23:03 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@linaro.org; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751507AbdDCCXC (ORCPT + 7 others); Sun, 2 Apr 2017 22:23:02 -0400 Received: from mail-pg0-f48.google.com ([74.125.83.48]:34799 "EHLO mail-pg0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751280AbdDCCXB (ORCPT ); Sun, 2 Apr 2017 22:23:01 -0400 Received: by mail-pg0-f48.google.com with SMTP id 21so105687810pgg.1 for ; Sun, 02 Apr 2017 19:23:01 -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=qoGTX5qJmqJbCg9RP9uc/PJG8OTVrm/xdcL56EzL+VQ=; b=bEpScIT8cLZuO4WzRhH8lBDJ+g0IugTbBRsapviYWB5829MCG1GKY90ArxuL0L6lCm EEygpN59xpDkFyNzPuQpm3OUuoOU5LsCefXkyzmVRjDpFUCuzL2sBssL5Al7pnT8Hc2T OTFIk147PA9zsUzbYUS+wPJiAX2dRHeVYPNjw= 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=qoGTX5qJmqJbCg9RP9uc/PJG8OTVrm/xdcL56EzL+VQ=; b=OiJ5Fnidp+tNFacC3l4QUku8UYKO5EDGs15O9Bfyznr+RJAPllimcEQd6eyue6F9/N l2x3T8UyWaqCzkF5LA9I8IayFUGRN5UAR5mYF6HvG5e7Aszlc4gLZN/rOinRIRfm015W aJLhITHxlleNxzS4UEAcRvX+3s4M3DXKubTXPB46Jzz5pc7yWPBJ4NWpe4XTqT/aJj2e WamHpnthn/PUZg7KiN0a5c816ROGoaRHktxY74vGDl/FH6VNmnwddb93ZF+6IPHARdj1 vm9UhkLYSOhqKIUOUe48jpFnb9tc+DCSZM+yqi2006ZW1ZrEyjK9C3W4CxBsktEuHHpu Eu6w== X-Gm-Message-State: AFeK/H017rxkisb6yFjuyGhUyKUcKgOv143IlvxXNjx4ZtJ60a8xxuuO5pqpwDBKZI4HO6XG X-Received: by 10.84.194.195 with SMTP id h61mr18894176pld.182.1491186180626; Sun, 02 Apr 2017 19:23:00 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id m3sm22241112pgn.52.2017.04.02.19.22.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 02 Apr 2017 19:23:00 -0700 (PDT) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, robh+dt@kernel.org, mark.rutland@arm.com Cc: james.morse@arm.com, geoff@infradead.org, bauerman@linux.vnet.ibm.com, dyoung@redhat.com, ard.biesheuvel@linaro.org, panand@redhat.com, sgoel@codeaurora.org, dwmw2@infradead.org, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, AKASHI Takahiro Subject: [PATCH v35 13/14] Documentation: dt: chosen properties for arm64 kdump Date: Mon, 3 Apr 2017 11:26:06 +0900 Message-Id: <20170403022606.12609-1-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.11.1 In-Reply-To: <20170403022139.12383-1-takahiro.akashi@linaro.org> References: <20170403022139.12383-1-takahiro.akashi@linaro.org> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: James Morse Add documentation for DT properties: linux,usable-memory-range linux,elfcorehdr used by arm64 kdump. Those are, respectively, a usable memory range allocated to crash dump kernel and the elfcorehdr's location within it. Signed-off-by: James Morse [takahiro.akashi@linaro.org: update the text due to recent changes ] Signed-off-by: AKASHI Takahiro Acked-by: Mark Rutland Cc: devicetree@vger.kernel.org Cc: Rob Herring --- Documentation/devicetree/bindings/chosen.txt | 45 ++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) -- 2.11.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt index 6ae9d82d4c37..b5e39af4ddc0 100644 --- a/Documentation/devicetree/bindings/chosen.txt +++ b/Documentation/devicetree/bindings/chosen.txt @@ -52,3 +52,48 @@ 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. + +While this property does not represent a real hardware, the address +and the size are expressed in #address-cells and #size-cells, +respectively, of the root node. + +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>; + }; +}; + +While this property does not represent a real hardware, the address +and the size are expressed in #address-cells and #size-cells, +respectively, of the root node.