Quoting Patchwork (2020-05-01 00:06:47)
> #### Possible regressions ####
> 
>   * igt@i915_selftest@live@mman:
>     - fi-gdg-551:         [PASS][1] -> [DMESG-FAIL][2]
>    [1]: 
> https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8403/fi-gdg-551/igt@i915_selftest@[email protected]
>    [2]: 
> https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17532/fi-gdg-551/igt@i915_selftest@[email protected]

The nightmare of the incoherent GTT. Nothing much we can do for
userspace (ptracing), but in our selftest we may have to use the
intel_gt_flush_ggtt_writes() hammer?
-Chris
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