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Record the LRC registers before/after a preemption event to ensure that the first context sees nothing from the second client; at least in the normal per-context register state. References: https://gitlab.freedesktop.org/drm/intel/issues/1233 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200227085723.1961649-12-chris@chris-wilson.co.uk