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This allows us to map the PTEs WC. I've not done thorough testing or
performance measurements with this patch, but it should be decent.
This is based on a patch from Jesse with the original commit message
> I've only lightly tested this so far, but the corruption seems to be
> gone if I write the GFX_FLSH_CNTL reg after binding an object. This
> register should control the TLB for the system agent, which is what CPU
> mapped objects will go through.
It has been updated for the new AGP-less code by me, and included with
it is feedback from the original patch.
v2: Updated to reflect paranoia on pte updates/register posting reads.
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by [v1]: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
0f9b91c754