[PATCH 2/5] drm/virtio: add uapi for in and out explicit fences

[Gerd Hoffmann]

On Tue, Oct 30, 2018 at 11:31:04AM +0000, Emil Velikov wrote:
> HI Gerd,
> 
> On Tue, 30 Oct 2018 at 06:11, Gerd Hoffmann <kraxel at redhat.com> wrote:
> >
> >   Hi,
> >
> > > The execbuffer IOCTL is now read-write to allow the userspace to read the
> > > out-fence.
> >
> > >  #define DRM_IOCTL_VIRTGPU_EXECBUFFER \
> > > -     DRM_IOW(DRM_COMMAND_BASE + DRM_VIRTGPU_EXECBUFFER,\
> > > +     DRM_IOWR(DRM_COMMAND_BASE + DRM_VIRTGPU_EXECBUFFER,\
> > >               struct drm_virtgpu_execbuffer)
> >
> > That changes the ioctl number and breaks the userspace api.
> >
> Have you looked at the drm_ioctl() implementation? AFAICT it
> explicitly caters for this kind of changes.

Looking ...

The direction bits are not used to lookup the ioctl functions,
so it should work indeed.

Series doesn't apply to drm-misc-next and needs a rebase.

cheers,
  Gerd