38  * generic delayed work implementation which delays work execution until a
39  * particular vblank has passed, and then executes the work at realtime
43  * re-arming work items can be easily implemented.
48 	struct drm_vblank_work *work, *next;  in drm_handle_vblank_works()  local
54 	list_for_each_entry_safe(work, next, &vblank->pending_work, node) {  in drm_handle_vblank_works()
55 		if (!drm_vblank_passed(count, work->count))  in drm_handle_vblank_works()
58 		list_del_init(&work->node);  in drm_handle_vblank_works()
60 		kthread_queue_work(vblank->worker, &work->base);  in drm_handle_vblank_works()
67 /* Handle cancelling any pending vblank work items and drop respective vblank
72 	struct drm_vblank_work *work, *next;  in drm_vblank_cancel_pending_works()  local
79 	list_for_each_entry_safe(work, next, &vblank->pending_work, node) {  in drm_vblank_cancel_pending_works()
80 		list_del_init(&work->node);  in drm_vblank_cancel_pending_works()
88  * drm_vblank_work_schedule - schedule a vblank work
89  * @work: vblank work to schedule
93  * Schedule @work for execution once the crtc vblank count reaches @count.
96  * %false the work starts to execute immediately.
99  * %true the work is deferred until the next vblank (as if @count has been
102  * If @work is already scheduled, this function will reschedule said work
103  * using the new @count. This can be used for self-rearming work items.
106  * %1 if @work was successfully (re)scheduled, %0 if it was either already
109 int drm_vblank_work_schedule(struct drm_vblank_work *work,  in drm_vblank_work_schedule()  argument
112 	struct drm_vblank_crtc *vblank = work->vblank;  in drm_vblank_work_schedule()
120 	if (work->cancelling)  in drm_vblank_work_schedule()
129 	if (list_empty(&work->node)) {  in drm_vblank_work_schedule()
133 	} else if (work->count == count) {  in drm_vblank_work_schedule()
140 	work->count = count;  in drm_vblank_work_schedule()
150 		ret = kthread_queue_work(vblank->worker, &work->base);  in drm_vblank_work_schedule()
153 			list_del_init(&work->node);  in drm_vblank_work_schedule()
158 			list_add_tail(&work->node, &vblank->pending_work);  in drm_vblank_work_schedule()
171  * drm_vblank_work_cancel_sync - cancel a vblank work and wait for it to
173  * @work: vblank work to cancel
175  * Cancel an already scheduled vblank work and wait for its
178  * On return, @work is guaranteed to no longer be scheduled or running, even
182  * %True if the work was cancelled before it started to execute, %false
185 bool drm_vblank_work_cancel_sync(struct drm_vblank_work *work)  in drm_vblank_work_cancel_sync()  argument
187 	struct drm_vblank_crtc *vblank = work->vblank;  in drm_vblank_work_cancel_sync()
192 	if (!list_empty(&work->node)) {  in drm_vblank_work_cancel_sync()
193 		list_del_init(&work->node);  in drm_vblank_work_cancel_sync()
198 	work->cancelling++;  in drm_vblank_work_cancel_sync()
203 	if (kthread_cancel_work_sync(&work->base))  in drm_vblank_work_cancel_sync()
207 	work->cancelling--;  in drm_vblank_work_cancel_sync()
215  * drm_vblank_work_flush - wait for a scheduled vblank work to finish
217  * @work: vblank work to flush
219  * Wait until @work has finished executing once.
221 void drm_vblank_work_flush(struct drm_vblank_work *work)  in drm_vblank_work_flush()  argument
223 	struct drm_vblank_crtc *vblank = work->vblank;  in drm_vblank_work_flush()
227 	wait_event_lock_irq(vblank->work_wait_queue, list_empty(&work->node),  in drm_vblank_work_flush()
231 	kthread_flush_work(&work->base);  in drm_vblank_work_flush()
236  * drm_vblank_work_flush_all - flush all currently pending vblank work on crtc.
237  * @crtc: crtc for which vblank work to flush
239  * Wait until all currently queued vblank work on @crtc
258  * drm_vblank_work_init - initialize a vblank work item
259  * @work: vblank work item
260  * @crtc: CRTC whose vblank will trigger the work execution
261  * @func: work function to be executed
263  * Initialize a vblank work item for a specific crtc.
265 void drm_vblank_work_init(struct drm_vblank_work *work, struct drm_crtc *crtc,  in drm_vblank_work_init()  argument
266 			  void (*func)(struct kthread_work *work))  in drm_vblank_work_init()  argument
268 	kthread_init_work(&work->base, func);  in drm_vblank_work_init()
269 	INIT_LIST_HEAD(&work->node);  in drm_vblank_work_init()
270 	work->vblank = drm_crtc_vblank_crtc(crtc);  in drm_vblank_work_init()