Re: [CI] drm/i915/selftests: Add tiled blits selftest

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Quoting Chris Wilson (2020-04-30 07:49:57)
> From: Zbigniew Kempczyński <zbigniew.kempczynski@xxxxxxxxx>
> 
> Extend coverage of the blitter client by exercising conversion to and
> from tiled sources. In the process we perform spot checks to verify that
> the tiling/detiling is being applied correctly, along with position
> invariance of the tiling parameters.
> 
> Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@xxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>

This does what I asked for a minimal and accurate replacement of tiled
blits, thanks! It can be bumped for sensitivity (spot check a few more
pixels, or the whole surface), it can also be adjusted for checking
tiling parameters and fine copies. What it tests right now is that we
can move objects around inside the GTT without losing tiling, which is
the foundational level of assurance we need.

Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris
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