1 files changed, 71 insertions, 0 deletions
diff --git a/include/drm/drm_vblank_work.h b/include/drm/drm_vblank_work.h
new file mode 100644
index 000000000..eb41d0810
--- /dev/null
+++ b/include/drm/drm_vblank_work.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: MIT */
+
+#ifndef _DRM_VBLANK_WORK_H_
+#define _DRM_VBLANK_WORK_H_
+
+#include <linux/kthread.h>
+
+struct drm_crtc;
+
+/**
+ * struct drm_vblank_work - A delayed work item which delays until a target
+ * vblank passes, and then executes at realtime priority outside of IRQ
+ * context.
+ *
+ * See also:
+ * drm_vblank_work_schedule()
+ * drm_vblank_work_init()
+ * drm_vblank_work_cancel_sync()
+ * drm_vblank_work_flush()
+ */
+struct drm_vblank_work {
+	/**
+	 * @base: The base &kthread_work item which will be executed by
+	 * &drm_vblank_crtc.worker. Drivers should not interact with this
+	 * directly, and instead rely on drm_vblank_work_init() to initialize
+	 * this.
+	 */
+	struct kthread_work base;
+
+	/**
+	 * @vblank: A pointer to &drm_vblank_crtc this work item belongs to.
+	 */
+	struct drm_vblank_crtc *vblank;
+
+	/**
+	 * @count: The target vblank this work will execute on. Drivers should
+	 * not modify this value directly, and instead use
+	 * drm_vblank_work_schedule()
+	 */
+	u64 count;
+
+	/**
+	 * @cancelling: The number of drm_vblank_work_cancel_sync() calls that
+	 * are currently running. A work item cannot be rescheduled until all
+	 * calls have finished.
+	 */
+	int cancelling;
+
+	/**
+	 * @node: The position of this work item in
+	 * &drm_vblank_crtc.pending_work.
+	 */
+	struct list_head node;
+};
+
+/**
+ * to_drm_vblank_work - Retrieve the respective &drm_vblank_work item from a
+ * &kthread_work
+ * @_work: The &kthread_work embedded inside a &drm_vblank_work
+ */
+#define to_drm_vblank_work(_work) \
+	container_of((_work), struct drm_vblank_work, base)
+
+int drm_vblank_work_schedule(struct drm_vblank_work *work,
+			     u64 count, bool nextonmiss);
+void drm_vblank_work_init(struct drm_vblank_work *work, struct drm_crtc *crtc,
+			  void (*func)(struct kthread_work *work));
+bool drm_vblank_work_cancel_sync(struct drm_vblank_work *work);
+void drm_vblank_work_flush(struct drm_vblank_work *work);
+
+#endif /* !_DRM_VBLANK_WORK_H_ */