drm/i915: Use cpu relocations if the object is in the GTT but not mappable

This prevents the case of unbinding the object in order to process the
relocations through the GTT and then rebinding it only to then proceed
to use cpu relocations as the object is now in the CPU write domain. By
choosing to use cpu relocations up front, we can therefore avoid the
rebind penalty.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -95,6 +95,7 @@ eb_destroy(struct eb_objects *eb)
 static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
 {
 	return (obj->base.write_domain == I915_GEM_DOMAIN_CPU ||
+		!obj->map_and_fenceable ||
 		obj->cache_level != I915_CACHE_NONE);
 }