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, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 2A689C43461 for ; Fri, 4 Sep 2020 11:21:25 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 E9621206B7 for ; Fri, 4 Sep 2020 11:21:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E9621206B7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id C84D186C2C; Fri, 4 Sep 2020 11:21:24 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UqCohjMFemTz; Fri, 4 Sep 2020 11:21:23 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 80B6586C1D; Fri, 4 Sep 2020 11:21:23 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 52261C0890; Fri, 4 Sep 2020 11:21:23 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id CCCA9C0052 for ; Fri, 4 Sep 2020 11:21:22 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id BCC5A86FD4 for ; Fri, 4 Sep 2020 11:21:22 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FonKE2FFzVCK for ; Fri, 4 Sep 2020 11:21:22 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by hemlock.osuosl.org (Postfix) with ESMTPS id 35C6186FBB for ; Fri, 4 Sep 2020 11:21:22 +0000 (UTC) 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) 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, Matthias Brugger , Yingjoe Chen , Christoph Hellwig , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" 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. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu