drm/i915/gen8: Add WaClearSlmSpaceAtContextSwitch workaround
In Indirect context w/a batch buffer, WaClearSlmSpaceAtContextSwitch This WA performs writes to scratch page so it must be valid, this check is performed before initializing the batch with this WA. v2: s/PIPE_CONTROL_FLUSH_RO_CACHES/PIPE_CONTROL_FLUSH_L3 (Ville) v3: GTT bit in scratch address should be mbz (Chris) Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Dave Gordon <david.s.gordon@intel.com> Signed-off-by: NRafael Barbalho <rafael.barbalho@intel.com> Signed-off-by: NArun Siluvery <arun.siluvery@linux.intel.com> Acked-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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