On Tue, 2020-09-15 at 07:42 +1000, Benjamin Herrenschmidt wrote: > > > which is back to my original question, how do you do DMA using > > /sys/xx/resources? Why not use VFIO like everything else? > > Note: All this doesnt' change the fact that sys/xx/resources_wc > exists > for other archs and I see no reasons so far not to have it on ARM... Also... it looks like VFIO also doesn't provide a way to do WC yet unfortunately :-( There was a discussion 2 or 3 years ago while I was at IBM about ways to add that functionality, but it doesn't seem to have resulted in anything. Cheers, Ben.
