[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 #97 from Marek Olšák <maraeo at gmail.com> 2012-08-03 15:20:12 UTC ---
(In reply to comment #96)
> Created attachment 65093 [details] [review]
> Possible fix.
> 
> It's hard and uneffecient to solve this problem completely in the kernel.
> 
> Since we patch the VM table synchronously, but use it asynchronously we will
> always end up needing to wait for a bo use by the GPU to end before patching in
> the new VA.
> 
> Please take a look at the attached patch it should fix the issue nicely in
> userspace.

Please use the radeon_bo_is_busy function. Calling DRM_RADEON_GEM_BUSY directly
is not reliable because of the thread offloading of the CS ioctl. The same
applies to any other kernel queries and commands which depend on the CS ioctl.

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