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=-8.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 2ECCEC4338F for ; Mon, 26 Jul 2021 12:25:47 +0000 (UTC) Received: from smtp4.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 CFEE260F51 for ; Mon, 26 Jul 2021 12:25:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org CFEE260F51 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 959B740303; Mon, 26 Jul 2021 12:25:46 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rDYoE9JtaD0w; Mon, 26 Jul 2021 12:25:45 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTPS id D760340132; Mon, 26 Jul 2021 12:25:44 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 9CBD2C0010; Mon, 26 Jul 2021 12:25:44 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 8ED3BC000E for ; Mon, 26 Jul 2021 12:25:43 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 7CE4C60752 for ; Mon, 26 Jul 2021 12:25:43 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Y8Eu8JhhdV6W for ; Mon, 26 Jul 2021 12:25:43 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 Received: from theia.8bytes.org (8bytes.org [IPv6:2a01:238:4383:600:38bc:a715:4b6d:a889]) by smtp3.osuosl.org (Postfix) with ESMTPS id DD4FD605C9 for ; Mon, 26 Jul 2021 12:25:42 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id 6D7EE2B0; Mon, 26 Jul 2021 14:25:40 +0200 (CEST) Date: Mon, 26 Jul 2021 14:25:39 +0200 From: Joerg Roedel To: Kyung Min Park Subject: Re: [PATCH v2] iommu/vt-d: Dump DMAR translation structure Message-ID: References: <20210722042453.10579-1-kyung.min.park@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210722042453.10579-1-kyung.min.park@intel.com> Cc: ravi.v.shankar@intel.com, ashok.raj@intel.com, dwmw2@infradead.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, will@kernel.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 Wed, Jul 21, 2021 at 09:24:53PM -0700, Kyung Min Park wrote: > When the dmar translation fault happens, the kernel prints a single line > fault reason with corresponding hexadecimal code defined in the Intel VT-d > specification. > > Currently, when user wants to debug the translation fault in detail, > debugfs is used for dumping the dmar_translation_struct, which is not > available when the kernel failed to boot. > > Dump the DMAR translation structure, pagewalk the IO page table and print > the page table entry when the fault happens. > > Signed-off-by: Kyung Min Park This is too much noise in dmesg for a single dmar fault. Please hide that additional debug information behind a debug kernel option for the VT-d driver. Thanks, Joerg _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu