[PATCH v7] unstable/drm-lease: DRM lease protocol support

[Pekka Paalanen]

On Fri, 18 Oct 2019 15:47:39 +0200
Philipp Zabel <p.zabel at pengutronix.de> wrote:

> On Fri, 2019-10-18 at 08:51 +0000, Simon Ser wrote:
> > On Thursday, October 17, 2019 11:15 PM, Drew DeVault <sir at cmpwn.com> wrote:
> >   
> > > On Thu Oct 17, 2019 at 6:08 PM Simon Ser wrote:
> > >   
> > > > Should we keep the connector event, now that we have an unprivileged
> > > > DRM FD?
> > > > Alternatives include:
> > > > 
> > > > -   Let the client use the FD to get what it needs (EDID/a configured
> > > >     output/something else).
> > > >   
> > > 
> > > Isn't this:
> > >   
> > > > -   Keep an event to advertise lease-able connector IDs  
> > > 
> > > What it's still there for? I'm not sure I understand, otherwise how is
> > > the client supposed to know which DRM resources it can request a lease
> > > for? How does it encode those intentions into a lease request? afaict
> > > the connector is still necessary.  
> > 
> > The client can recognize EDIDs it's interested in, and then try to
> > lease these connectors. The lease will fail if the connectors aren't
> > leasable. This isn't a big deal for e.g. VR and we can always add the
> > connector event later if needed.  
> 
> If there was no event for the appearance of leasable connectors, the
> client would have to listen to hotplug uevents itself if it wants to be
> capable of handling HMDs plugged in later. Is this something we want to
> require?

Supporting hotplug is a good question. I didn't think the connector
events were for that, though. I think hotplug and hot-unplug should be
discussed in the spec, how they are expected to work.

DRM hotplug events are udev events which (for now) just say "hey, go
re-scan stuff, something probably changed". I don't think clients
should need to listen to udev events as well.


Thanks,
pq
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