From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14EE2C43461 for ; Fri, 4 Sep 2020 11:22:48 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 CF68E206B7 for ; Fri, 4 Sep 2020 11:22:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="mlnN/VSn" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CF68E206B7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=sh/3pw6JTNWJt7Vm+ZiRTCkcdziH+DTXDxVHkkiATys=; b=mlnN/VSn4R43dkCxgrgOXbfam DpehBldeHLb3Vr6BMV1lExSJ4NHKy+CMNRutx/BDwZ/bAbj/8hS+M5ATBnBDM2/DxybG1EQTFndfU orRd4fqTsPzowsRT2AS23SfleRpQVySICrKCNY8qWVv4gMwQvifabo08uCge5DiDQN+CATN3l7Ayu 492cISUB0cKl/Cb/n8WNzATexZNn1N4zB/H5mgln5yEmSou6A40TeQ3Va4IdhblE9Fl7id65Lt4qp xvJunnpp6l2ZN1incSjcHBC3EJfzq6LaWXyPoROH8/h1fUoCN4JMOGbC5ejBTls3F//zFPb8Ws08/ 5ZPBs/67Q==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kE9mX-0006m8-W1; Fri, 04 Sep 2020 11:21:26 +0000 Received: from 8bytes.org ([81.169.241.247] helo=theia.8bytes.org) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kE9mU-0006lU-Nr; Fri, 04 Sep 2020 11:21:23 +0000 Received: by theia.8bytes.org (Postfix, from userid 1000) id 6B8533D5; Fri, 4 Sep 2020 13:21:19 +0200 (CEST) Date: Fri, 4 Sep 2020 13:21:18 +0200 From: Joerg Roedel To: Miles Chen Subject: Re: [RESEND PATCHv5] iommu/mediatek: check 4GB mode by reading infracfg Message-ID: <20200904112117.GC16609@8bytes.org> References: <20200904104038.4979-1-miles.chen@mediatek.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200904104038.4979-1-miles.chen@mediatek.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200904_072122_908938_4D7CA58A X-CRM114-Status: GOOD ( 13.48 ) 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: Rob Herring , devicetree@vger.kernel.org, wsd_upstream@mediatek.com, David Hildenbrand , linux-kernel@vger.kernel.org, Mike Rapoport , Chao Hao , iommu@lists.linux-foundation.org, Rob Herring , linux-mediatek@lists.infradead.org, Yong Wu , Matthias Brugger , Yingjoe Chen , Christoph Hellwig , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Sep 04, 2020 at 06:40:38PM +0800, Miles Chen wrote: > In previous discussion [1] and [2], we found that it is risky to > use max_pfn or totalram_pages to tell if 4GB mode is enabled. > > Check 4GB mode by reading infracfg register, remove the usage > of the un-exported symbol max_pfn. > > This is a step towards building mtk_iommu as a kernel module. > > [1] https://lore.kernel.org/lkml/20200603161132.2441-1-miles.chen@mediatek.com/ > [2] https://lore.kernel.org/lkml/20200604080120.2628-1-miles.chen@mediatek.com/ > [3] https://lore.kernel.org/lkml/20200715205120.GA778876@bogus/ Applied, thanks. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel