Re: [RFC PATCH 00/28] Removing struct page from P2PDMA

Jason Gunthorpe
2019-06-24T18:54:44Z

On Mon, Jun 24, 2019 at 12:28:33PM -0600, Logan Gunthorpe wrote:

> > Sounded like this series does generate the dma_addr for the correct
> > device..
>
> This series doesn't generate any DMA addresses with dma_map(). The
> current p2pdma code ensures everything is behind the same root port and
> only uses the pci bus address. This is valid and correct, but yes it's
> something to expand upon.

I think if you do this it still has to be presented as the same API
like dma_map that takes in the target device * and produces the device
specific dma_addr_t

Otherwise this whole thing is confusing and looks like *all* of it can
only work under the switch assumption

Jason