[Intel-gfx] [PATCH 4/4] drm/i915/gen12: Invalidate aux table entries forcibly

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> Quoting Mika Kuoppala (2020-05-06 15:47:34)
>> Aux table invalidation can fail on update. So
>> next access may cause memory access to be into stale entry.
>> 
>> Proposed workaround is to invalidate entries between
>> all batchbuffers.
>
> This sounds like it should have a sunset clause. Do we anticipate being
> able to drop this w/a in future?

Rafael kindly pointed out that Mesa already does this:
https://gitlab.freedesktop.org/mesa/mesa/-/blob/master/src/gallium/drivers/iris/iris_state.c#L5131
So I would say we can drop this patch.

But it makes me wonder that is that LRI dropped for not being whitelisted.

-Mika