Re: [PATCH] drm/i915/gt: Fill all the unused space in the GGTT

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On Tue, 31 Mar 2020 at 13:42, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
>
> When we allocate space in the GGTT we may have to allocate a larger
> region than will be populated by the object to accommodate fencing. Make
> sure that this space beyond the end of the buffer points safely into
> scratch space, in case the HW tries to access it anyway (e.g. fenced
> access to the last tile row).
>
> Reported-by: Imre Deak <imre.deak@xxxxxxxxx>
> References: https://gitlab.freedesktop.org/drm/intel/-/issues/1554
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
> Cc: Imre Deak <imre.deak@xxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

Do we not need similar treatment for gen6? It seems to also play
tricks with the nop clear range, or did we disable gen7 ppgtt in the
end?

Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
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