drm/i915/gt: Skip global serialisation of clear_range for bxt vtd
VT'd on Broxton and on Braswell require serialisation of GGTT updates. However, it seems to only be required for insertion, so drop the complication and heavyweight stop_machine() for clears. The range will be serialised again before use. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200130092239.1743672-1-chris@chris-wilson.co.uk
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