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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 B2666C49EA6 for ; Thu, 24 Jun 2021 11:14:56 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (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 62830611CE for ; Thu, 24 Jun 2021 11:14:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 62830611CE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 2693E606A8; Thu, 24 Jun 2021 11:14:56 +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 9Oyr4triBBjO; Thu, 24 Jun 2021 11:14:55 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp3.osuosl.org (Postfix) with ESMTPS id E16486061D; Thu, 24 Jun 2021 11:14:54 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id B3433C001A; Thu, 24 Jun 2021 11:14:54 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [IPv6:2605:bc80:3010::138]) by lists.linuxfoundation.org (Postfix) with ESMTP id D0C88C000E for ; Thu, 24 Jun 2021 11:14:53 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id C3F2983CF3 for ; Thu, 24 Jun 2021 11:14:53 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZzhEJpxikeLQ for ; Thu, 24 Jun 2021 11:14:53 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp1.osuosl.org (Postfix) with ESMTP id 0F06283CE4 for ; Thu, 24 Jun 2021 11:14:52 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3087531B; Thu, 24 Jun 2021 04:14:52 -0700 (PDT) Received: from [10.57.9.136] (unknown [10.57.9.136]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 72B7B3F718; Thu, 24 Jun 2021 04:14:44 -0700 (PDT) Subject: Re: [PATCH v14 06/12] swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing To: Claire Chang , Christoph Hellwig References: <20210619034043.199220-1-tientzu@chromium.org> <20210619034043.199220-7-tientzu@chromium.org> <76c3343d-72e5-9df3-8924-5474ee698ef4@quicinc.com> <20210623183736.GA472@willie-the-truck> <19d4c7a2-744d-21e0-289c-a576e1f0e6f3@quicinc.com> <20210624054315.GA25381@lst.de> From: Robin Murphy Message-ID: <364e6715-eafd-fc4a-e0af-ce2a042756b4@arm.com> Date: Thu, 24 Jun 2021 12:14:39 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB Cc: heikki.krogerus@linux.intel.com, linux-devicetree , peterz@infradead.org, benh@kernel.crashing.org, joonas.lahtinen@linux.intel.com, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, grant.likely@arm.com, paulus@samba.org, Frank Rowand , mingo@kernel.org, Jianxiong Gao , Stefano Stabellini , Saravana Kannan , mpe@ellerman.id.au, "Rafael J . Wysocki" , Bartosz Golaszewski , bskeggs@redhat.com, linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org, Dan Williams , matthew.auld@intel.com, Nicolas Boichat , thomas.hellstrom@linux.intel.com, Jim Quinlan , Will Deacon , Konrad Rzeszutek Wilk , intel-gfx@lists.freedesktop.org, maarten.lankhorst@linux.intel.com, jani.nikula@linux.intel.com, Rob Herring , rodrigo.vivi@intel.com, Bjorn Helgaas , boris.ostrovsky@oracle.com, Andy Shevchenko , jgross@suse.com, airlied@linux.ie, Thierry Reding , Greg KH , Randy Dunlap , Qian Cai , lkml , "list@263.net:IOMMU DRIVERS" , Daniel Vetter , xypron.glpk@gmx.de, Tom Lendacky , linuxppc-dev@lists.ozlabs.org, bauerman@linux.ibm.com 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 2021-06-24 07:05, Claire Chang wrote: > On Thu, Jun 24, 2021 at 1:43 PM Christoph Hellwig wrote: >> >> On Wed, Jun 23, 2021 at 02:44:34PM -0400, Qian Cai wrote: >>> is_swiotlb_force_bounce at /usr/src/linux-next/./include/linux/swiotlb.h:119 >>> >>> is_swiotlb_force_bounce() was the new function introduced in this patch here. >>> >>> +static inline bool is_swiotlb_force_bounce(struct device *dev) >>> +{ >>> + return dev->dma_io_tlb_mem->force_bounce; >>> +} >> >> To me the crash looks like dev->dma_io_tlb_mem is NULL. Can you >> turn this into : >> >> return dev->dma_io_tlb_mem && dev->dma_io_tlb_mem->force_bounce; >> >> for a quick debug check? > > I just realized that dma_io_tlb_mem might be NULL like Christoph > pointed out since swiotlb might not get initialized. > However, `Unable to handle kernel paging request at virtual address > dfff80000000000e` looks more like the address is garbage rather than > NULL? > I wonder if that's because dev->dma_io_tlb_mem is not assigned > properly (which means device_initialize is not called?). What also looks odd is that the base "address" 0xdfff800000000000 is held in a couple of registers, but the offset 0xe looks too small to match up to any relevant structure member in that dereference chain :/ Robin. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu