Re: [PATCH v3 01/11] PCI/P2PDMA: Support peer-to-peer memory

[Stephen Bates]

>I assume you want to exclude Root Ports because of multi-function
>  devices and the "route to self" error.  I was hoping for a reference
>  to that so I could learn more about it.

Apologies Bjorn. This slipped through my net. I will try and get you a reference for RTS in the next couple of days.
    
> While I was looking for it, I found sec 6.12.1.2 (PCIe r4.0), "ACS
> Functions in SR-IOV Capable and Multi-Function Devices", which seems
> relevant.  It talks about "peer-to-peer Requests (between Functions of
> the device)".  Thay says to me that multi-function devices can DMA
> between themselves.
    
I will go take a look. Appreciate the link.

Stephen