+static int
+vmw_ioctl_get_param(struct vmw_driver *vmw, uint32_t param, uint64_t *out)
+{
+ struct drm_vmw_getparam_arg gp_arg;
+ int ret;
+
+ memset(&gp_arg, 0, sizeof(gp_arg));
+ gp_arg.param = param;
+ ret = drmCommandWriteRead(vmw->fd, DRM_VMW_GET_PARAM,
+ &gp_arg, sizeof(gp_arg));
+
+ if (ret == 0) {
+ *out = gp_arg.value;
+ }
+
+ return ret;
+}
+
+int
+vmw_ioctl_supports_overlay(struct vmw_driver *vmw)
+{
+ uint64_t value;
+ int ret;
+
+ ret = vmw_ioctl_get_param(vmw, DRM_VMW_PARAM_OVERLAY_IOCTL, &value);
+ if (ret)
+ return ret;
+
+ return value ? 0 : -ENOSYS;
+}
+