[RFC PATCH] drm/syncobj: add IOCTL to register an eventfd for a timeline

[Simon Ser]

On Sunday, October 9th, 2022 at 20:00, Christian König <christian.koenig at amd.com> wrote:

> Am 09.10.22 um 16:40 schrieb Simon Ser:
> 
> > Introduce a new DRM_IOCTL_SYNCOBJ_TIMELINE_REGISTER_EVENTFD IOCTL
> > which signals an eventfd when a timeline point completes.
> 
> I was entertaining the same though for quite a while, but I would even
> go a step further and actually always base the wait before signal
> functionality of the drm_syncobj and the eventfd functionality. That
> would save us quite a bit of complexity I think.

Hm what do you mean exactly? I'm not sure I'm following.

> As a general note I think the name
> DRM_IOCTL_SYNCOBJ_TIMELINE_REGISTER_EVENTFD is just to long, just make
> that DRM_IOCTL_SYNCOBJ_EVENTFD. Same for the function names as well.

Agreed.

> Additional to that I think we should also always have a graceful
> handling for binary syncobjs. So please try to avoid making this special
> for the timeline case (the timeline case should of course still be
> supported).

This makes sense to me.