Quoting Chris Wilson (2018-11-02 18:12:12)
> Since capturing the error state requires fiddling around with the GGTT
> to read arbitrary buffers and is itself run under stop_machine(), it
> deadlocks the machine (effectively a hard hang) when run in conjunction
> with Broxton's VTd workaround to serialize GGTT access.
>
> v2: Store the ERR_PTR in first_error so that the error can be reported
> to the user via sysfs.
>
> Fixes: 0ef34ad6222a ("drm/i915: Serialize GTT/Aperture accesses on BXT")
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: Jon Bloomfield <jon.bloomfi...@intel.com>
> Cc: John Harrison <john.c.harri...@intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
> Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
> Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
Might be worthy splurting something to the dmesg?
Reviewed-by: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
Regards, Joonas
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