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=-2.2 required=3.0 tests=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 2690BC3A59C for ; Thu, 15 Aug 2019 13:36:01 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (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 073132084D for ; Thu, 15 Aug 2019 13:36:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 073132084D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id ACEB0504; Thu, 15 Aug 2019 13:36:00 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 037893EE for ; Thu, 15 Aug 2019 13:35:59 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 958D087B for ; Thu, 15 Aug 2019 13:35:58 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id A750A68AFE; Thu, 15 Aug 2019 15:35:54 +0200 (CEST) Date: Thu, 15 Aug 2019 15:35:54 +0200 From: Christoph Hellwig To: Corentin Labbe , bskeggs@redhat.com, airlied@linux.ie, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org Subject: Re: DMA-API: cacheline tracking ENOMEM, dma-debug disabled due to nouveau ? Message-ID: <20190815133554.GE12036@lst.de> References: <20190814145033.GA11190@Red> <20190814174927.GT7444@phenom.ffwll.local> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190814174927.GT7444@phenom.ffwll.local> User-Agent: Mutt/1.5.17 (2007-11-01) X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 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 Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On Wed, Aug 14, 2019 at 07:49:27PM +0200, Daniel Vetter wrote: > On Wed, Aug 14, 2019 at 04:50:33PM +0200, Corentin Labbe wrote: > > Hello > > > > Since lot of release (at least since 4.19), I hit the following error message: > > DMA-API: cacheline tracking ENOMEM, dma-debug disabled > > > > After hitting that, I try to check who is creating so many DMA mapping and see: > > cat /sys/kernel/debug/dma-api/dump | cut -d' ' -f2 | sort | uniq -c > > 6 ahci > > 257 e1000e > > 6 ehci-pci > > 5891 nouveau > > 24 uhci_hcd > > > > Does nouveau having this high number of DMA mapping is normal ? > > Yeah seems perfectly fine for a gpu. That is a lot and apparently overwhelm the dma-debug tracking. Robin rewrote this code in Linux 4.21 to work a little better, so I'm curious why this might have changes in 4.19, as dma-debug did not change at all there. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu