On Mon, Nov 07, 2016 at 10:54:43AM +0000, Chris Wilson wrote:
> When we split a large object up into chunks for GTT faulting (because we
> can't fit the whole object into the aperture) we have to align our cuts
> with the fence registers. Each partial VMA must cover a complete set of
> tile rows or the offset into each partial VMA is not aligned with the
> whole image. Currently we enforce a minimum size on each partial VMA,
> but this minimum size itself was not aligned to the tile row causing
> distortion.
>
> Reported-by: Andreas Reis <andreas.reis@xxxxxxxxx>
> Reported-by: Chris Clayton <chris2553@xxxxxxxxxxxxxx>
> Reported-by: Norbert Preining <preining@xxxxxxxx>
> Tested-by: Norbert Preining <preining@xxxxxxxx>
> Fixes: 03af84fe7f48 ("drm/i915: Choose partial chunksize based on tile row size")
> Fixes: a61007a83a46 ("drm/i915: Fix partial GGTT faulting") # enabling patch
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98402
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: <drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx> # v4.9-rc1+
Testcase: igt/gem_mmap_gtt/medium-copy-odd
Appears quite difficult to actually aim for. I was expecting the
huge-copy to be the main test case (since its objects can never fit) -
not sure why it still passes. Still we manage to it with one of them!
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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