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
76 	list_for_each_entry_safe(work, next, &vblank->pending_work, node) {  in drm_vblank_cancel_pending_works()
77 		list_del_init(&work->node);  in drm_vblank_cancel_pending_works()
85  * drm_vblank_work_schedule - schedule a vblank work
86  * @work: vblank work to schedule
90  * Schedule @work for execution once the crtc vblank count reaches @count.
93  * %false the work starts to execute immediately.
96  * %true the work is deferred until the next vblank (as if @count has been
99  * If @work is already scheduled, this function will reschedule said work
100  * using the new @count. This can be used for self-rearming work items.
103  * %1 if @work was successfully (re)scheduled, %0 if it was either already
106 int drm_vblank_work_schedule(struct drm_vblank_work *work,  in drm_vblank_work_schedule()  argument
109 	struct drm_vblank_crtc *vblank = work->vblank;  in drm_vblank_work_schedule()
117 	if (work->cancelling)  in drm_vblank_work_schedule()
126 	if (list_empty(&work->node)) {  in drm_vblank_work_schedule()
130 	} else if (work->count == count) {  in drm_vblank_work_schedule()
137 	work->count = count;  in drm_vblank_work_schedule()
147 		ret = kthread_queue_work(vblank->worker, &work->base);  in drm_vblank_work_schedule()
150 			list_del_init(&work->node);  in drm_vblank_work_schedule()
155 			list_add_tail(&work->node, &vblank->pending_work);  in drm_vblank_work_schedule()
168  * drm_vblank_work_cancel_sync - cancel a vblank work and wait for it to
170  * @work: vblank work to cancel
172  * Cancel an already scheduled vblank work and wait for its
175  * On return, @work is guaranteed to no longer be scheduled or running, even
179  * %True if the work was cancelled before it started to execute, %false
182 bool drm_vblank_work_cancel_sync(struct drm_vblank_work *work)  in drm_vblank_work_cancel_sync()  argument
184 	struct drm_vblank_crtc *vblank = work->vblank;  in drm_vblank_work_cancel_sync()
189 	if (!list_empty(&work->node)) {  in drm_vblank_work_cancel_sync()
190 		list_del_init(&work->node);  in drm_vblank_work_cancel_sync()
195 	work->cancelling++;  in drm_vblank_work_cancel_sync()
200 	if (kthread_cancel_work_sync(&work->base))  in drm_vblank_work_cancel_sync()
204 	work->cancelling--;  in drm_vblank_work_cancel_sync()
212  * drm_vblank_work_flush - wait for a scheduled vblank work to finish
214  * @work: vblank work to flush
216  * Wait until @work has finished executing once.
218 void drm_vblank_work_flush(struct drm_vblank_work *work)  in drm_vblank_work_flush()  argument
220 	struct drm_vblank_crtc *vblank = work->vblank;  in drm_vblank_work_flush()
224 	wait_event_lock_irq(vblank->work_wait_queue, list_empty(&work->node),  in drm_vblank_work_flush()
228 	kthread_flush_work(&work->base);  in drm_vblank_work_flush()
233  * drm_vblank_work_init - initialize a vblank work item
234  * @work: vblank work item
235  * @crtc: CRTC whose vblank will trigger the work execution
236  * @func: work function to be executed
238  * Initialize a vblank work item for a specific crtc.
240 void drm_vblank_work_init(struct drm_vblank_work *work, struct drm_crtc *crtc,  in drm_vblank_work_init()  argument
241 			  void (*func)(struct kthread_work *work))  in drm_vblank_work_init()  argument
243 	kthread_init_work(&work->base, func);  in drm_vblank_work_init()
244 	INIT_LIST_HEAD(&work->node);  in drm_vblank_work_init()
245 	work->vblank = &crtc->dev->vblank[drm_crtc_index(crtc)];  in drm_vblank_work_init()