1 // SPDX-License-Identifier: MIT
18 	struct xe_exec_queue *q = pfence->q;  in preempt_fence_work_func()
20 	if (pfence->error) {  in preempt_fence_work_func()
21 		dma_fence_set_error(&pfence->base, pfence->error);  in preempt_fence_work_func()
22 	} else if (!q->ops->reset_status(q)) {  in preempt_fence_work_func()
23 		int err = q->ops->suspend_wait(q);  in preempt_fence_work_func()
26 			dma_fence_set_error(&pfence->base, err);  in preempt_fence_work_func()
27 	} else {  in preempt_fence_work_func()
28 		dma_fence_set_error(&pfence->base, -ENOENT);  in preempt_fence_work_func()
31 	dma_fence_signal(&pfence->base);  in preempt_fence_work_func()
33 	 * Opt for keep everything in the fence critical section. This looks really strange since we  in preempt_fence_work_func()
35 	 * global ordered-wq, therefore anything that happens in this callback can easily block  in preempt_fence_work_func()
37 	 * ever signalling.  Therefore try to keep everything here in the callback in the fence  in preempt_fence_work_func()
38 	 * critical section. For example if something below grabs a scary lock like vm->lock,  in preempt_fence_work_func()
42 	xe_vm_queue_rebind_worker(q->vm);  in preempt_fence_work_func()
63 	struct xe_exec_queue *q = pfence->q;  in preempt_fence_enable_signaling()
65 	pfence->error = q->ops->suspend(q);  in preempt_fence_enable_signaling()
66 	queue_work(q->vm->xe->preempt_fence_wq, &pfence->preempt_work);  in preempt_fence_enable_signaling()
77  * xe_preempt_fence_alloc() - Allocate a preempt fence with minimal
95 		return ERR_PTR(-ENOMEM);  in xe_preempt_fence_alloc()
97 	INIT_LIST_HEAD(&pfence->link);  in xe_preempt_fence_alloc()
98 	INIT_WORK(&pfence->preempt_work, preempt_fence_work_func);  in xe_preempt_fence_alloc()
104  * xe_preempt_fence_free() - Free a preempt fence allocated using
112 	list_del(&pfence->link);  in xe_preempt_fence_free()
117  * xe_preempt_fence_arm() - Arm a preempt fence allocated using
122  * @context: The dma-fence context used for arming.
123  * @seqno: The dma-fence seqno used for arming.
135 	list_del_init(&pfence->link);  in xe_preempt_fence_arm()
136 	pfence->q = xe_exec_queue_get(q);  in xe_preempt_fence_arm()
137 	spin_lock_init(&pfence->lock);  in xe_preempt_fence_arm()
138 	dma_fence_init(&pfence->base, &preempt_fence_ops,  in xe_preempt_fence_arm()
139 		      &pfence->lock, context, seqno);  in xe_preempt_fence_arm()
141 	return &pfence->base;  in xe_preempt_fence_arm()
145  * xe_preempt_fence_create() - Helper to create and arm a preempt fence.
147  * @context: The dma-fence context used for arming.
148  * @seqno: The dma-fence seqno used for arming.
155  * ERR_PTR(-ENOMEM);
172 	return fence->ops == &preempt_fence_ops;  in xe_fence_is_xe_preempt()