[PATCH v4 3/4] drm/virtio: add in/out fence support for explicit synchronization

[Gerd Hoffmann]

  Hi,

> > > I had a look into this and how other drivers are doing it.
> > > msm[1] and etnaviv[2] seem to use the same dual-use variable.
> > 
> > Ok, lets do it the same way then.
> > What is the status of the userspace side of this?
> 
> The patch is hosted here[1], but is as of yet unmerged.
> 
> I know the drm subsystem requires a userspace implementation of
> all features, but does it have to be upstreamed first?

Which part is merged first doesn't matter much I think, but both kernel
and userspace side patches should be reviewed, especially the API bits,
so we don't end up with a bad API.

cheers,
  Gerd