diff --git a/include/uapi/linux/nvgpu-t18x.h b/include/uapi/linux/nvgpu-t18x.h
index 6116ec616..e2696b4c3 100644
--- a/include/uapi/linux/nvgpu-t18x.h
+++ b/include/uapi/linux/nvgpu-t18x.h
@@ -58,6 +58,10 @@
 				NVGPU_GPU_FLAGS_ECC_ENABLED_TEX    |	\
 				NVGPU_GPU_FLAGS_ECC_ENABLED_LTC)
 
+/* Channel event_id in nvgpu_channel_events_ctrl_ext_args */
+#define NVGPU_IOCTL_CHANNEL_EVENT_ID_CILP_PREEMPTION_STARTED	3
+#define NVGPU_IOCTL_CHANNEL_EVENT_ID_CILP_PREEMPTION_COMPLETE	4
+
 #endif /* _UAPI__LINUX_NVGPU_T18X_IOCTL_H_ */