__igt_mmap_revoke
err = __igt_mmap_revoke(i915, obj, I915_MMAP_TYPE_GTT);
err = __igt_mmap_revoke(i915, obj, I915_MMAP_TYPE_WC);
err = __igt_mmap_revoke(i915, obj, I915_MMAP_TYPE_FIXED);