[Bug 45018] [bisected] rendering regression since added support for virtual address space on cayman v11

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=45018

--- Comment #88 from Michel Dänzer <michel at daenzer.net> 2012-08-03 07:47:17 UTC ---
(In reply to comment #86)
> So, Anthony has put a finger on something.

Yes, I think something like Anthony's patch is needed due to asynchronous GPU
processing: when the userspace driver assigns virtual address space for a new
BO, the GPU may not have finished processing command streams using previous BOs
occupying that same virtual address space.

However, the userspace driver shouldn't wait synchronously for the BO to go
idle when destroying it but should instead defer destruction (or at least the
freeing of the virtual address space) until it notices the BO has become idle.


> With Anthony's patch, I'm still able to lock the display everytime

And these lockups do not happen when not using virtual address space? Can you
provide the dmesg output of the GPU reset for such a lockup? Ideally from a
single piglit test reproducing it.

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