Add linux-drm-syncobj-v1 protocol

src/wayland/handlers/drm_syncobj.rs

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
+use crate::state::{BackendData, State};
+use smithay::{
+    delegate_drm_syncobj,
+    wayland::drm_syncobj::{DrmSyncobjHandler, DrmSyncobjState},
+};
+
+impl DrmSyncobjHandler for State {
+    fn drm_syncobj_state(&mut self) -> &mut DrmSyncobjState {
+        let kms = match &mut self.backend {
+            BackendData::Kms(kms) => kms,
+            _ => unreachable!(),
+        };
+        kms.syncobj_state.as_mut().unwrap()
+    }
+}
+
+delegate_drm_syncobj!(State);