On 3/29/23 18:16, Jason Gunthorpe wrote: > On Wed, Mar 29, 2023 at 04:28:08PM +0200, Linus Walleij wrote: > >> I'm a bit puzzled: could the above code (which exist in >> three instances in the driver) even work as it is? Or is it not used? >> Or is there some failover from DMA to something else that is constantly >> happening? > > The physical address dma type IB_MR_TYPE_DMA is rarely used and maybe > nobody ever tested it, at least in a configuration where kva != pa > > Then again, maybe I got it wrong and it is still a kva in this case > because it is still ultimately DMA mapped when using IB_MR_TYPE_DMA? > > Bob? > > Jason In the amd64 environment I use to dev and test there is no difference AFAIK. I have to go on faith that other platforms work but have very little experience. Bob
