[Bug 26345] [845G] CPU/GPU incoherency

[bugzilla-daemon at freedesktop.org]

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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