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

Dan Williams
2021-04-27T20:49:11Z

On Tue, Apr 27, 2021 at 1:22 PM John Hubbard <jhubbard@nvidia.com> wrote:
>
> 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.

Still in my queue as well behind Joao's memmap consolidation series,
and a recent copy_mc_to_iter() fix series from Al.