[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 #89 from Alexandre Demers <alexandre.f.demers at gmail.com> 2012-08-03 08:05:07 UTC ---
(In reply to comment #88)
> (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.

Nope, no lockup without va (I may only be lucky though if the bug is there but
only shown when using va). I'll try to find a way to get dmesg... It has been a
problem since the start for that part, but I may be able to use another
computer to log in remotely. May take a couple of days to do though.

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