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