[Mesa-dev] [PATCH] kms-swrast: Support Prime fd handling

[Andreas Pokorny]

Hi,


On Thu, Aug 28, 2014 at 6:09 PM, Giovanni Campagna <
scampa.giovanni at gmail.com> wrote:

> On Thu, Aug 28, 2014 at 4:01 PM, Emil Velikov <emil.l.velikov at gmail.com>
> wrote:
> > On 22/08/14 17:41, Andreas Pokorny wrote:
> >> Allows using prime fds as display target and from display target.
> >> Test for PRIME capability after initializing kms_swrast screen.
> >>
> > Hi Andreas,
> >
> > I'm hoping that Giovanni will take a look. After all kms-dri is his
> creation.
>
> I'm not sure I'm the right person to look at this code. After all I'm
> not a mesa developer.
>
> From a cursory review, the patches look good to me, but what I'm not
> seeing are the necessary EGL changes to make use of prime fds with
> kms-swrast, eg. EGL_WL_bind_wayland_display is still not exposed, even
> though it could be implemented using prime fds.
>

I have no clue on the current state of what wayland requires. There seem to
be a lot of options now. I assumed the patch is one of the necessary pieces.


> Another thing is, you briefly mentioned the generic GEM ioctls. If
> drivers really can use the generic GEM_FLINK/GEM_OPEN ioctl to give a
> name to dumb buffers, then indeed the kms-swrast driver is capable of
> buffer sharing (I always assumed that a somehow real GEM was
> necessary, and that the simple one in qxl/cirrus/simpledrm was not
> enough). I'd like to see that implemented first, which would allow to
> remove a good amount of complexity and special casing in gallium and
> egl (and would allow using kms-swrast for faster sw wayland too).
>

I was about to do that, then recent regressions in kvm utils and some low
hanging fruits in i915 distracted me.
.. so real soon now..

regards
Andreas
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