linux-kernel - DMA-API: cacheline tracking ENOMEM, dma-debug disabled due to nouveau ?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190814145033.GA11190@Red>
Date:   Wed, 14 Aug 2019 16:50:33 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     bskeggs@...hat.com, airlied@...ux.ie, daniel@...ll.ch, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com
Cc:     dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: DMA-API: cacheline tracking ENOMEM, dma-debug disabled due to
 nouveau ?

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