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

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Message-ID: <20181030135242.doccralyqaqzshyx@sirius.home.kraxel.org>
Date:   Tue, 30 Oct 2018 14:52:42 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Emil Velikov <emil.l.velikov@...il.com>
Cc:     Robert Foss <robert.foss@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Emil Velikov <emil.velikov@...labora.com>
Subject: Re: [PATCH 2/5] drm/virtio: add uapi for in and out explicit fences

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@...hat.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