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

[Daniel Vetter]

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