From patchwork Wed Nov 2 04:54:25 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 690241 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3t7wXq6Jvyz9tl4 for ; Wed, 2 Nov 2016 15:46:19 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.b=FH6IjS6Z; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751947AbcKBEqS (ORCPT ); Wed, 2 Nov 2016 00:46:18 -0400 Received: from mail-pf0-f173.google.com ([209.85.192.173]:35284 "EHLO mail-pf0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751063AbcKBEqR (ORCPT ); Wed, 2 Nov 2016 00:46:17 -0400 Received: by mail-pf0-f173.google.com with SMTP id i88so4254291pfk.2 for ; Tue, 01 Nov 2016 21:46:17 -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=u84Agd6tREXx0Zn++0jLWxnm+2D8cTxGRu+OCHR9N1I=; b=FH6IjS6ZfTm0k2+caQcfd22I2VK1zwdZ/20E0f+RQpyWf4fmPTqnf3TJzbN/jn6Xhr nt6T6zoQtm0CWy3PJYmgSfrdHSk6lhg4lwj2pwUjEthOzSrge6osMeTbqwFod/SqIgH/ 9p9B5jv+LIsfMwhsJriqx856EainsIWn6+OZQ= 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=u84Agd6tREXx0Zn++0jLWxnm+2D8cTxGRu+OCHR9N1I=; b=VrL7uDmlBaR52VOUd8Zi1FIhehWzXU1TYLfQMuZlX6VCoObL9hqYN2DBjAJY+2QINy tBbvRCVUrJfW1UQMJeep+TMgRfTclFr0x2+z3VTKgPYh1AFpqmRJjJGLiiftsHhYx2dh Is0op3Jeq4GoB8rlBfNsw4/ioDMjQvPrB9Kmy5b+CzGb68Q5wscHNHX1Kk6RZTXyoA4B g/na+qX/v4nVQGNQslaPvQD0qxKh+bH2eFtnYYdx9cle7zyccMNc2esYClL68ldkIkYD E+s6WKvT40wtF869jPmelQVfBtEJ+zxjGxXCVPjZl1/qDMoUvBkbcysbfg7BN9om5dDO 8N9w== X-Gm-Message-State: ABUngveXfzY5mMvDgdce9C5Z3nTC0NmZskNSbGtxJmo0oxg7lx9+8tmvtgMKHHP5SnMvW12i X-Received: by 10.99.56.74 with SMTP id h10mr2632437pgn.75.1478061976922; Tue, 01 Nov 2016 21:46:16 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id r88sm449465pfe.93.2016.11.01.21.46.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Nov 2016 21:46:16 -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, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, AKASHI Takahiro Subject: [PATCH v27 9/9] Documentation: dt: chosen properties for arm64 kdump Date: Wed, 2 Nov 2016 13:54:25 +0900 Message-Id: <20161102045425.12126-1-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20161102044959.11954-1-takahiro.akashi@linaro.org> References: <20161102044959.11954-1-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 linux,crashkernel-base and crashkernel-size, linux,usable-memory-range linux,elfcorehdr used by arm64 kdump to decribe the kdump reserved area, and the elfcorehdr's location within it. Signed-off-by: James Morse [takahiro.akashi@linaro.org: added "linux,crashkernel-base" and "-size" ] Signed-off-by: AKASHI Takahiro Cc: devicetree@vger.kernel.org Cc: Rob Herring Cc: Mark Rutland --- 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..7b11516 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 as PT_LOAD segments of elf format. +e.g. + +/ { + chosen { + linux,elfcorehdr = <0x9 0xfffff000 0x0 0x800>; + }; +};