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=-2.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 E58A7C32753 for ; Wed, 14 Aug 2019 14:50:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BB7872133F for ; Wed, 14 Aug 2019 14:50:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="pcnVgWDP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728148AbfHNOuk (ORCPT ); Wed, 14 Aug 2019 10:50:40 -0400 Received: from mail-wm1-f41.google.com ([209.85.128.41]:54377 "EHLO mail-wm1-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726126AbfHNOui (ORCPT ); Wed, 14 Aug 2019 10:50:38 -0400 Received: by mail-wm1-f41.google.com with SMTP id p74so4844972wme.4 for ; Wed, 14 Aug 2019 07:50:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=/DXlUZnAnppcVmvRaCvG45NAF6K209fxQvIeSZzOmy4=; b=pcnVgWDPpVIKvEGcoQm5OxaoBVqYZbMOQiqkZ3wTAZr8Y6ocDyeakMLA8Im1Y+g99D POTgttsWlFnHPGAOzmL9x63nQingz9nYI4tmdXIrqRiCxn+kPG3T16a2nvIYG8GQ2Vzs Wce7Jnayh7CiIlLHBB2wEP03uzF21zbs288aBwspAfbTH7jE/zAGLwIiABldEZ0t2MFl 7g+sqkueLUfkGGO7etvOXVSscsbkaSLTKp6TuYRkN4eneuKFf/g2q7u1xTmiXRL4QSi9 08axMg8aBPXjCpcOkD6x6gdVVXu3E7WHEH7t0kz1SSsDjvHpa4CY59KwF9g2UEt0zSR3 HS0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=/DXlUZnAnppcVmvRaCvG45NAF6K209fxQvIeSZzOmy4=; b=jXQgzVaklX99sfpBCAqhOWSZkiSwBFnQKMvcw7zOPAdUeuqsG1rWq8XxSVyMppK9gD C/tK8EvwegHNK7NiQvgyHuElcFHmB/b64X+xgzjGZvae/vnGytdsTUbYlWidIe7IwSq/ qyHVxRkeaAH4hdHWf9RkhowtWJezQjSJcSz8yINF6vgCshnyOzjmn+NY0r7nJF0meTBH 2yXKnkJP0Uwnp4PmTIDWjtOzUo6q0g5gAk1bVKTj65Yt7Y7s78fJJmeLTYy1VOKVmBP9 o/X6KeLUtltxT3Pt+5sIQ051ztzuxP+c/PtkXwiyai/YsUHXN5xpMn1uGVcOQ6eBChfQ 1Zxg== X-Gm-Message-State: APjAAAVMdHodDvUf8378Fnwr67zdFyKY3xpsYj0cDiIZtWepLp0RjueU SzcYtmkotOq0pQy8GbSkL0k= X-Google-Smtp-Source: APXvYqzoe9W3VA/sAzPxBxLK/CY1XdtfCqCC8uiIxtC44+YlxqrDtNJOaniUqy9vvtFN3+P4u+PPwA== X-Received: by 2002:a7b:cbcf:: with SMTP id n15mr9053044wmi.48.1565794236524; Wed, 14 Aug 2019 07:50:36 -0700 (PDT) Received: from Red ([2a01:cb1d:147:7200:2e56:dcff:fed2:c6d6]) by smtp.googlemail.com with ESMTPSA id t198sm7911434wmt.39.2019.08.14.07.50.35 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 14 Aug 2019 07:50:35 -0700 (PDT) Date: Wed, 14 Aug 2019 16:50:33 +0200 From: Corentin Labbe To: bskeggs@redhat.com, airlied@linux.ie, daniel@ffwll.ch, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com Cc: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org Subject: DMA-API: cacheline tracking ENOMEM, dma-debug disabled due to nouveau ? Message-ID: <20190814145033.GA11190@Red> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 ? Regards