[Intel-gfx] [RFC] Page table sharing and bufferless execbuf

[Chris Wilson]

On Fri, Sep 04, 2015 at 09:58:54AM -0700, Jesse Barnes wrote:
> A few things to think about:
>   - how to signal GPU hangs with the new execbuf (a signal might be more
>     natural as the execution appears more CPU-like?  what state do we
>     have to worry about restoring for bufferless contexts?

GPU hangs are not signalled via execbuf. The only time userspace is told
via execbuf is when the kernel rejects the cmdbuffer (EIO when it can't
program the hardware queues). EIO notification currently is at the wait
points, and with manually querying. Having a signal would fit in nicely
with the async nature of cmdbuffers and be useful today - though I don't
know how practical it is to extend the signal ABI.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre