drm/i915: ensure context objects are bound to the global gtt

This way round we don't introduce and ugly layering violations and use
the interface as I planned to use it.

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 5248c00..fb6aa5e 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -358,6 +358,9 @@
 	if (ret)
 		return ret;
 
+	if (!to->obj->has_global_gtt_mapping)
+		i915_gem_gtt_bind_object(to->obj, to->obj->cache_level);
+
 	if (!to->is_initialized || is_default_context(to))
 		hw_flags |= MI_RESTORE_INHIBIT;
 	else if (WARN_ON_ONCE(from_obj == to->obj)) /* not yet expected */