https://bugs.freedesktop.org/show_bug.cgi?id=26345
--- Comment #153 from Chris Wilson <chris at chris-wilson.co.uk> ---
Now in kernel form as well:
commit b75e53bac7f4164e1c53a636352faa3d177b4beb
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date: Sun Dec 16 18:08:07 2012 +0100
drm/i915: Implement workaround for broken CS tlb on i830/845
Now that Chris Wilson demonstrated that the key for stability on early
gen 2 is to simple _never_ exchange the physical backing storage of
batch buffers I've tried a stab at a kernel solution. Doesn't look too
nefarious imho, now that I don't try to be too clever for my own good
any more.
v2: After discussing the various techniques, we've decided to always blit
batches on the suspect devices, but allow userspace to opt out of the
kernel workaround assume full responsibility for providing coherent
batches. The principal reason is that avoiding the blit does improve
performance in a few key microbenchmarks and also in cairo-trace
replays.
Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
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