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Check that we are correctly invalidating the TLB at the start of a batch after updating the GTT. v2: Comments and hold the request reference while spinning Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190919131414.7495-1-chris@chris-wilson.co.uk