[PATCH v2 4/7] drm/panfrost: Add the ability to create submit queues

[Alyssa Rosenzweig]

> > My Vulkan knowledge is limited so I'm not sure whether this is the right
> > approach or not. In particular is it correct that an application can
> > create a high priority queue which could affect other (normal priority)
> > applications?
> 
> That's what msm does (with no extra CAPS check AFAICT), and the
> freedreno driver can already create high priority queues if
> PIPE_CONTEXT_HIGH_PRIORITY is passed. Not saying that's okay to allow
> userspace to tweak the priority, but if that's a problem, other drivers
> are in trouble too ;-).

Speaking of, how will PIPE_CONTEXT_HIGH_PRIORITY be implemented with the
new ioctl()? I envisioned something much simpler (for the old ioctl),
just adding a "high priority?" flag to the submit and internally
creating the two queues of normal/high priority for drm_sched to work
out. Is this juggling now moved to userspace?