op 22-07-14 16:24, Christian K?nig schreef: >> No, you really shouldn't be doing much in the check anyway, it's meant to be >> a lightweight check. If you're not ready yet because of a lockup simply >> return not signaled yet. > It's not only the lockup case from radeon I have in mind here. For userspace > queues it might be necessary to call copy_from_user to figure out if a fence > is signaled or not. > > Returning false all the time is probably not a good idea either. Having userspace implement a fence sounds like an awful idea, why would you want to do that?
A fence could be exported to userspace, but that would only mean it can wait for it to be signaled with an interface like poll.. ~Maarten
