void i915_gem_setup_global_gtt(struct drm_device *dev, unsigned long start,
unsigned long mappable_end, unsigned long end);
-bool intel_enable_ppgtt(struct drm_device *dev, bool full);
int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt);
void i915_check_and_clear_faults(struct drm_device *dev);