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

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Message-ID: <20190814174927.GT7444@phenom.ffwll.local>
Date:   Wed, 14 Aug 2019 19:49:27 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     bskeggs@...hat.com, airlied@...ux.ie, daniel@...ll.ch, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: DMA-API: cacheline tracking ENOMEM, dma-debug disabled due to
 nouveau ?

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.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch