Re: [PATCH v4 04/14] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches

Stephen Bates
2018-05-09T16:30:32Z

Hi Jerome

> Now inside that page table you can point GPU virtual address
> to use GPU memory or use system memory. Those system memory entry can
> also be mark as ATS against a given PASID.

Thanks. This all makes sense.

But do you have examples of this in a kernel driver (if so can you point me too it) or is this all done via user-space? Based on my grepping of the kernel code I see zero EP drivers using in-kernel ATS functionality right now...

Stephen