From patchwork Thu May 21 09:38:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: chenzhou X-Patchwork-Id: 11562551 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 14D7B912 for ; Thu, 21 May 2020 09:36:47 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E7B992072C for ; Thu, 21 May 2020 09:36:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="qyGNytpf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E7B992072C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=pQhpgPWWOdecj+exNYtKvDYRtTzSTQENDBuk9uhsYk8=; b=qyGNytpfUOQcXe vhKR+LU3+acXqNb6C3v5ezozNjL8AxEyRmLTqZG5vG9w6gnn8t/3NTZ6XcbGjm4WMs15aAs2h6AFn I9PiCqAkIC97KPr4ArOnIGhu8Li2dWhxsOkZa9enETtxjZXvjr/FWF9+dwjLRQiUtuFsgx1W6M0op 8IHROkxdZotfIQDIv1v8IKh8BzK5wa7qnF5YN0kCiH7saVFAmoDs2ljBOoEJ3gKbpivSQUNar7iYG NfJY5gLTo7RvUw1h/aUK/FbcXk4TexJ0l2GCP5haLjJCSD2LYsPhyMG/RZURZaxG2aQIpAKfDxnRZ vXLeIg/X8INg0YxZu2Ew==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jbhd6-00036T-Gu; Thu, 21 May 2020 09:36:44 +0000 Received: from szxga06-in.huawei.com ([45.249.212.32] helo=huawei.com) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jbhbe-0001G3-1h; Thu, 21 May 2020 09:35:24 +0000 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 9BA5FE96E50757FA2EB1; Thu, 21 May 2020 17:35:12 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.487.0; Thu, 21 May 2020 17:35:06 +0800 From: Chen Zhou To: , , , , , , Subject: [PATCH v8 5/5] dt-bindings: chosen: Document linux, low-memory-range for arm64 kdump Date: Thu, 21 May 2020 17:38:05 +0800 Message-ID: <20200521093805.64398-6-chenzhou10@huawei.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200521093805.64398-1-chenzhou10@huawei.com> References: <20200521093805.64398-1-chenzhou10@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200521_023514_281306_D1A6B1E3 X-CRM114-Status: UNSURE ( 8.00 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [45.249.212.32 listed in list.dnswl.org] 0.0 RCVD_IN_MSPIKE_H4 RBL: Very Good reputation (+4) [45.249.212.32 listed in wl.mailspike.net] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: John.p.donnelly@oracle.com, arnd@arndb.de, devicetree@vger.kernel.org, chenzhou10@huawei.com, linux-doc@vger.kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, horms@verge.net.au, guohanjun@huawei.com, pkushwaha@marvell.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add documentation for DT property used by arm64 kdump: linux,low-memory-range. "linux,low-memory-range" is an another memory region used for crash dump kernel devices. Signed-off-by: Chen Zhou --- Documentation/devicetree/bindings/chosen.txt | 25 ++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt index 45e79172a646..bfe6fb6976e6 100644 --- a/Documentation/devicetree/bindings/chosen.txt +++ b/Documentation/devicetree/bindings/chosen.txt @@ -103,6 +103,31 @@ 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,low-memory-range +---------------------- +This property (arm64 only) holds a base address and size, describing a +limited region below 4G. Similar to "linux,usable-memory-range", it is +an another memory range which may be considered available for use by the +kernel. + +e.g. + +/ { + chosen { + linux,low-memory-range = <0x0 0x70000000 0x0 0x10000000>; + linux,usable-memory-range = <0x202f 0xc0000000 0x0 0x40000000>; + }; +}; + +The main usage is for crash dump kernel devices when reserving crashkernel +above 4G. When reserving crashkernel above 4G, there may be two crash kernel +regions, one is below 4G, the other is above 4G. In order to distinct from +the high region, use this property to pass the low region. + +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 ----------------