Re: [PATCH 00/16] Add new DMA mapping operation for P2PDMA

[John Hubbard]

On 4/27/21 12:28 PM, Jason Gunthorpe wrote:
> On Thu, Apr 08, 2021 at 11:01:07AM -0600, Logan Gunthorpe wrote:
> > Hi,
> >
> > This patchset continues my work to to add P2PDMA support to the common
> > dma map operations. This allows for creating SGLs that have both P2PDMA
> > and regular pages which is a necessary step to allowing P2PDMA pages in
> > userspace.
> >
> > The earlier RFC[1] generated a lot of great feedback and I heard no show
> > stopping objections. Thus, I've incorporated all the feedback and have
> > decided to post this as a proper patch series with hopes of eventually
> > getting it in mainline.
> >
> > I'm happy to do a few more passes if anyone has any further feedback
> > or better ideas.
>
> For the user of the DMA API the idea seems reasonable enough, the next
> steps to integrate with pin_user_pages() seem fairly straightfoward
> too
>
> Was there no feedback on this at all?

oops, I meant to review this a lot sooner, because this whole p2pdma thing is
actually very interesting and important...somehow it slipped but I'll take
a look now.

thanks,
--
John Hubbard
NVIDIA