include/linux/interrupt.h

1 /* SPDX-License-Identifier: GPL-2.0 */
44  * IRQF_SHARED - allow sharing the irq among several devices
45  * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
46  * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
47  * IRQF_PERCPU - Interrupt is per cpu
48  * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
49  * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
52  * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
55  * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend.  Does not guarantee
57  *                   state.  See Documentation/power/suspend-and-interrupts.rst
58  * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
59  * IRQF_NO_THREAD - Interrupt cannot be threaded
60  * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
62  * IRQF_COND_SUSPEND - If the IRQ is shared with a NO_SUSPEND user, execute this
66  * IRQF_NO_AUTOEN - Don't enable IRQ or NMI automatically when users request it.
69  * IRQF_NO_DEBUG - Exclude from runnaway detection for IPI and similar handlers,
71  * IRQF_COND_ONESHOT - Agree to do IRQF_ONESHOT if already set for a shared
96  * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
97  * IRQC_IS_NESTED - interrupt runs in a nested threaded context
107  * struct irqaction - per interrupt action descriptor
141  * If a (PCI) device interrupt is not connected we set dev->irq to
142  * IRQ_NOTCONNECTED. This causes request_irq() to fail with -ENOTCONN, so we
156  * request_irq - Add a handler for an interrupt line
240 		    disable_irq(*_T->lock), enable_irq(*_T->lock))
257  * struct irq_affinity_notify - context for notification of IRQ affinity changes
279  * struct irq_affinity - Description for automatic irq affinity assignments
281  *			the MSI(-X) vector space
283  *			the MSI(-X) vector space
302  * struct irq_affinity_desc - Interrupt affinity descriptor
325  * irq_update_affinity_hint - Update the affinity hint
338  * irq_set_affinity_and_hint - Update the affinity hint and apply the provided
377 	return -EINVAL;  in irq_set_affinity()
395 	return -EINVAL;  in irq_update_affinity_hint()
401 	return -EINVAL;  in irq_set_affinity_and_hint()
407 	return -EINVAL;  in irq_set_affinity_hint()
413 	return -EINVAL;  in irq_update_affinity_desc()
441  * and which is the only irq-context user of a lock,
442  * that it's safe to take the lock in the irq-disabled
626 /* Tasklets --- multithreaded analogue of BHs.
629    https://lore.kernel.org/lkml/20200716081538.2sivhkj4hcyrusem@linutronix.de
644    * Tasklet is strictly serialized wrt itself, but not
700 	return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);  in tasklet_trylock()
718 	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))  in tasklet_schedule()
726 	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))  in tasklet_hi_schedule()
732 	atomic_inc(&t->count);  in tasklet_disable_nosync()
757 	atomic_dec(&t->count);  in tasklet_enable()
781  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.