[Intel-gfx] [PATCH] drm/i915/gt: Temporarily force MTL into uncached mode

[Andi Shyti]

Hi Matt,

> > > > FIXME: CAT errors are cropping up on MTL.  This removes them,
> > > > but the real root cause must still be diagnosed.
> > > 
> > > Do you have a link to specific IGT test(s) that illustrate the CAT
> > > errors so that we can ensure that they now appear fixed in CI?
> > 
> > this one:
> > 
> > https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_124599v1/bat-mtlp-8/igt@i915_selftest@live@hugepages.html
> > 
> > Andi
> 
> Wait, now I'm confused.  That's a failure caused by a different patch
> series (one that we won't be moving forward with).  The live at hugepages
> test is always passing on drm-tip today:
> https://intel-gfx-ci.01.org/tree/drm-tip/igt@i915_selftest@live@hugepages.html

yes, true, but that patch allows us to move forward with the
testing and hit the CAT error.

(it was the most reachable link I found :))

> Is there a test that's giving CAT errors on drm-tip itself (even
> sporadically) that we can monitor to see the impact of Jonathan's patch
> here?

Otherwise this one:

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_13667/re-mtlp-3/igt@gem_exec_fence@parallel.html#dmesg-warnings11

Andi