1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
6 * This file contains the core interrupt handling code, for irq-chip based
7 * architectures. Detailed information is available in
8 * Documentation/core-api/genericirq.rst
11 #include <linux/irq.h>
12 #include <linux/msi.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/irqdomain.h>
18 #include <trace/events/irq.h>
20 #include "internals.h"
22 static irqreturn_t bad_chained_irq(int irq, void *dev_id)
24 WARN_ONCE(1, "Chained irq %d should not call an action\n", irq);
29 * Chained handlers should never call action on their IRQ. This default
30 * action will emit warning if such thing happens.
32 struct irqaction chained_action = {
33 .handler = bad_chained_irq,
37 * irq_set_chip - set the irq chip for an irq
39 * @chip: pointer to irq chip description structure
41 int irq_set_chip(unsigned int irq, const struct irq_chip *chip)
44 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
49 desc->irq_data.chip = (struct irq_chip *)(chip ?: &no_irq_chip);
50 irq_put_desc_unlock(desc, flags);
52 * For !CONFIG_SPARSE_IRQ make the irq show up in
58 EXPORT_SYMBOL(irq_set_chip);
61 * irq_set_irq_type - set the irq trigger type for an irq
63 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
65 int irq_set_irq_type(unsigned int irq, unsigned int type)
68 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
74 ret = __irq_set_trigger(desc, type);
75 irq_put_desc_busunlock(desc, flags);
78 EXPORT_SYMBOL(irq_set_irq_type);
81 * irq_set_handler_data - set irq handler data for an irq
82 * @irq: Interrupt number
83 * @data: Pointer to interrupt specific data
85 * Set the hardware irq controller data for an irq
87 int irq_set_handler_data(unsigned int irq, void *data)
90 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
94 desc->irq_common_data.handler_data = data;
95 irq_put_desc_unlock(desc, flags);
98 EXPORT_SYMBOL(irq_set_handler_data);
101 * irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
102 * @irq_base: Interrupt number base
103 * @irq_offset: Interrupt number offset
104 * @entry: Pointer to MSI descriptor data
106 * Set the MSI descriptor entry for an irq at offset
108 int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
109 struct msi_desc *entry)
112 struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
116 desc->irq_common_data.msi_desc = entry;
117 if (entry && !irq_offset)
118 entry->irq = irq_base;
119 irq_put_desc_unlock(desc, flags);
124 * irq_set_msi_desc - set MSI descriptor data for an irq
125 * @irq: Interrupt number
126 * @entry: Pointer to MSI descriptor data
128 * Set the MSI descriptor entry for an irq
130 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
132 return irq_set_msi_desc_off(irq, 0, entry);
136 * irq_set_chip_data - set irq chip data for an irq
137 * @irq: Interrupt number
138 * @data: Pointer to chip specific data
140 * Set the hardware irq chip data for an irq
142 int irq_set_chip_data(unsigned int irq, void *data)
145 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
149 desc->irq_data.chip_data = data;
150 irq_put_desc_unlock(desc, flags);
153 EXPORT_SYMBOL(irq_set_chip_data);
155 struct irq_data *irq_get_irq_data(unsigned int irq)
157 struct irq_desc *desc = irq_to_desc(irq);
159 return desc ? &desc->irq_data : NULL;
161 EXPORT_SYMBOL_GPL(irq_get_irq_data);
163 static void irq_state_clr_disabled(struct irq_desc *desc)
165 irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
168 static void irq_state_clr_masked(struct irq_desc *desc)
170 irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
173 static void irq_state_clr_started(struct irq_desc *desc)
175 irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED);
178 static void irq_state_set_started(struct irq_desc *desc)
180 irqd_set(&desc->irq_data, IRQD_IRQ_STARTED);
191 __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
193 struct irq_data *d = irq_desc_get_irq_data(desc);
195 if (!irqd_affinity_is_managed(d))
196 return IRQ_STARTUP_NORMAL;
198 irqd_clr_managed_shutdown(d);
200 if (cpumask_any_and(aff, cpu_online_mask) >= nr_cpu_ids) {
202 * Catch code which fiddles with enable_irq() on a managed
203 * and potentially shutdown IRQ. Chained interrupt
204 * installment or irq auto probing should not happen on
205 * managed irqs either.
207 if (WARN_ON_ONCE(force))
208 return IRQ_STARTUP_ABORT;
210 * The interrupt was requested, but there is no online CPU
211 * in it's affinity mask. Put it into managed shutdown
212 * state and let the cpu hotplug mechanism start it up once
213 * a CPU in the mask becomes available.
215 return IRQ_STARTUP_ABORT;
218 * Managed interrupts have reserved resources, so this should not
221 if (WARN_ON(irq_domain_activate_irq(d, false)))
222 return IRQ_STARTUP_ABORT;
223 return IRQ_STARTUP_MANAGED;
226 static __always_inline int
227 __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
229 return IRQ_STARTUP_NORMAL;
233 static int __irq_startup(struct irq_desc *desc)
235 struct irq_data *d = irq_desc_get_irq_data(desc);
238 /* Warn if this interrupt is not activated but try nevertheless */
239 WARN_ON_ONCE(!irqd_is_activated(d));
241 if (d->chip->irq_startup) {
242 ret = d->chip->irq_startup(d);
243 irq_state_clr_disabled(desc);
244 irq_state_clr_masked(desc);
248 irq_state_set_started(desc);
252 int irq_startup(struct irq_desc *desc, bool resend, bool force)
254 struct irq_data *d = irq_desc_get_irq_data(desc);
255 struct cpumask *aff = irq_data_get_affinity_mask(d);
260 if (irqd_is_started(d)) {
263 switch (__irq_startup_managed(desc, aff, force)) {
264 case IRQ_STARTUP_NORMAL:
265 if (d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP)
266 irq_setup_affinity(desc);
267 ret = __irq_startup(desc);
268 if (!(d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP))
269 irq_setup_affinity(desc);
271 case IRQ_STARTUP_MANAGED:
272 irq_do_set_affinity(d, aff, false);
273 ret = __irq_startup(desc);
275 case IRQ_STARTUP_ABORT:
276 irqd_set_managed_shutdown(d);
281 check_irq_resend(desc, false);
286 int irq_activate(struct irq_desc *desc)
288 struct irq_data *d = irq_desc_get_irq_data(desc);
290 if (!irqd_affinity_is_managed(d))
291 return irq_domain_activate_irq(d, false);
295 int irq_activate_and_startup(struct irq_desc *desc, bool resend)
297 if (WARN_ON(irq_activate(desc)))
299 return irq_startup(desc, resend, IRQ_START_FORCE);
302 static void __irq_disable(struct irq_desc *desc, bool mask);
304 void irq_shutdown(struct irq_desc *desc)
306 if (irqd_is_started(&desc->irq_data)) {
308 if (desc->irq_data.chip->irq_shutdown) {
309 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
310 irq_state_set_disabled(desc);
311 irq_state_set_masked(desc);
313 __irq_disable(desc, true);
315 irq_state_clr_started(desc);
320 void irq_shutdown_and_deactivate(struct irq_desc *desc)
324 * This must be called even if the interrupt was never started up,
325 * because the activation can happen before the interrupt is
326 * available for request/startup. It has it's own state tracking so
327 * it's safe to call it unconditionally.
329 irq_domain_deactivate_irq(&desc->irq_data);
332 void irq_enable(struct irq_desc *desc)
334 if (!irqd_irq_disabled(&desc->irq_data)) {
337 irq_state_clr_disabled(desc);
338 if (desc->irq_data.chip->irq_enable) {
339 desc->irq_data.chip->irq_enable(&desc->irq_data);
340 irq_state_clr_masked(desc);
347 static void __irq_disable(struct irq_desc *desc, bool mask)
349 if (irqd_irq_disabled(&desc->irq_data)) {
353 irq_state_set_disabled(desc);
354 if (desc->irq_data.chip->irq_disable) {
355 desc->irq_data.chip->irq_disable(&desc->irq_data);
356 irq_state_set_masked(desc);
364 * irq_disable - Mark interrupt disabled
365 * @desc: irq descriptor which should be disabled
367 * If the chip does not implement the irq_disable callback, we
368 * use a lazy disable approach. That means we mark the interrupt
369 * disabled, but leave the hardware unmasked. That's an
370 * optimization because we avoid the hardware access for the
371 * common case where no interrupt happens after we marked it
372 * disabled. If an interrupt happens, then the interrupt flow
373 * handler masks the line at the hardware level and marks it
376 * If the interrupt chip does not implement the irq_disable callback,
377 * a driver can disable the lazy approach for a particular irq line by
378 * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
379 * be used for devices which cannot disable the interrupt at the
380 * device level under certain circumstances and have to use
381 * disable_irq[_nosync] instead.
383 void irq_disable(struct irq_desc *desc)
385 __irq_disable(desc, irq_settings_disable_unlazy(desc));
388 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
390 if (desc->irq_data.chip->irq_enable)
391 desc->irq_data.chip->irq_enable(&desc->irq_data);
393 desc->irq_data.chip->irq_unmask(&desc->irq_data);
394 cpumask_set_cpu(cpu, desc->percpu_enabled);
397 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
399 if (desc->irq_data.chip->irq_disable)
400 desc->irq_data.chip->irq_disable(&desc->irq_data);
402 desc->irq_data.chip->irq_mask(&desc->irq_data);
403 cpumask_clear_cpu(cpu, desc->percpu_enabled);
406 static inline void mask_ack_irq(struct irq_desc *desc)
408 if (desc->irq_data.chip->irq_mask_ack) {
409 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
410 irq_state_set_masked(desc);
413 if (desc->irq_data.chip->irq_ack)
414 desc->irq_data.chip->irq_ack(&desc->irq_data);
418 void mask_irq(struct irq_desc *desc)
420 if (irqd_irq_masked(&desc->irq_data))
423 if (desc->irq_data.chip->irq_mask) {
424 desc->irq_data.chip->irq_mask(&desc->irq_data);
425 irq_state_set_masked(desc);
429 void unmask_irq(struct irq_desc *desc)
431 if (!irqd_irq_masked(&desc->irq_data))
434 if (desc->irq_data.chip->irq_unmask) {
435 desc->irq_data.chip->irq_unmask(&desc->irq_data);
436 irq_state_clr_masked(desc);
440 void unmask_threaded_irq(struct irq_desc *desc)
442 struct irq_chip *chip = desc->irq_data.chip;
444 if (chip->flags & IRQCHIP_EOI_THREADED)
445 chip->irq_eoi(&desc->irq_data);
451 * handle_nested_irq - Handle a nested irq from a irq thread
452 * @irq: the interrupt number
454 * Handle interrupts which are nested into a threaded interrupt
455 * handler. The handler function is called inside the calling
458 void handle_nested_irq(unsigned int irq)
460 struct irq_desc *desc = irq_to_desc(irq);
461 struct irqaction *action;
462 irqreturn_t action_ret;
466 raw_spin_lock_irq(&desc->lock);
468 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
470 action = desc->action;
471 if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
472 desc->istate |= IRQS_PENDING;
476 kstat_incr_irqs_this_cpu(desc);
477 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
478 raw_spin_unlock_irq(&desc->lock);
480 action_ret = IRQ_NONE;
481 for_each_action_of_desc(desc, action)
482 action_ret |= action->thread_fn(action->irq, action->dev_id);
484 if (!irq_settings_no_debug(desc))
485 note_interrupt(desc, action_ret);
487 raw_spin_lock_irq(&desc->lock);
488 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
491 raw_spin_unlock_irq(&desc->lock);
493 EXPORT_SYMBOL_GPL(handle_nested_irq);
495 static bool irq_check_poll(struct irq_desc *desc)
497 if (!(desc->istate & IRQS_POLL_INPROGRESS))
499 return irq_wait_for_poll(desc);
502 static bool irq_may_run(struct irq_desc *desc)
504 unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
507 * If the interrupt is not in progress and is not an armed
508 * wakeup interrupt, proceed.
510 if (!irqd_has_set(&desc->irq_data, mask))
514 * If the interrupt is an armed wakeup source, mark it pending
515 * and suspended, disable it and notify the pm core about the
518 if (irq_pm_check_wakeup(desc))
522 * Handle a potential concurrent poll on a different core.
524 return irq_check_poll(desc);
528 * handle_simple_irq - Simple and software-decoded IRQs.
529 * @desc: the interrupt description structure for this irq
531 * Simple interrupts are either sent from a demultiplexing interrupt
532 * handler or come from hardware, where no interrupt hardware control
535 * Note: The caller is expected to handle the ack, clear, mask and
536 * unmask issues if necessary.
538 void handle_simple_irq(struct irq_desc *desc)
540 raw_spin_lock(&desc->lock);
542 if (!irq_may_run(desc))
545 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
547 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
548 desc->istate |= IRQS_PENDING;
552 kstat_incr_irqs_this_cpu(desc);
553 handle_irq_event(desc);
556 raw_spin_unlock(&desc->lock);
558 EXPORT_SYMBOL_GPL(handle_simple_irq);
561 * handle_untracked_irq - Simple and software-decoded IRQs.
562 * @desc: the interrupt description structure for this irq
564 * Untracked interrupts are sent from a demultiplexing interrupt
565 * handler when the demultiplexer does not know which device it its
566 * multiplexed irq domain generated the interrupt. IRQ's handled
567 * through here are not subjected to stats tracking, randomness, or
568 * spurious interrupt detection.
570 * Note: Like handle_simple_irq, the caller is expected to handle
571 * the ack, clear, mask and unmask issues if necessary.
573 void handle_untracked_irq(struct irq_desc *desc)
575 raw_spin_lock(&desc->lock);
577 if (!irq_may_run(desc))
580 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
582 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
583 desc->istate |= IRQS_PENDING;
587 desc->istate &= ~IRQS_PENDING;
588 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
589 raw_spin_unlock(&desc->lock);
591 __handle_irq_event_percpu(desc);
593 raw_spin_lock(&desc->lock);
594 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
597 raw_spin_unlock(&desc->lock);
599 EXPORT_SYMBOL_GPL(handle_untracked_irq);
602 * Called unconditionally from handle_level_irq() and only for oneshot
603 * interrupts from handle_fasteoi_irq()
605 static void cond_unmask_irq(struct irq_desc *desc)
608 * We need to unmask in the following cases:
609 * - Standard level irq (IRQF_ONESHOT is not set)
610 * - Oneshot irq which did not wake the thread (caused by a
611 * spurious interrupt or a primary handler handling it
614 if (!irqd_irq_disabled(&desc->irq_data) &&
615 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
620 * handle_level_irq - Level type irq handler
621 * @desc: the interrupt description structure for this irq
623 * Level type interrupts are active as long as the hardware line has
624 * the active level. This may require to mask the interrupt and unmask
625 * it after the associated handler has acknowledged the device, so the
626 * interrupt line is back to inactive.
628 void handle_level_irq(struct irq_desc *desc)
630 raw_spin_lock(&desc->lock);
633 if (!irq_may_run(desc))
636 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
639 * If its disabled or no action available
640 * keep it masked and get out of here
642 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
643 desc->istate |= IRQS_PENDING;
647 kstat_incr_irqs_this_cpu(desc);
648 handle_irq_event(desc);
650 cond_unmask_irq(desc);
653 raw_spin_unlock(&desc->lock);
655 EXPORT_SYMBOL_GPL(handle_level_irq);
657 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
659 if (!(desc->istate & IRQS_ONESHOT)) {
660 chip->irq_eoi(&desc->irq_data);
664 * We need to unmask in the following cases:
665 * - Oneshot irq which did not wake the thread (caused by a
666 * spurious interrupt or a primary handler handling it
669 if (!irqd_irq_disabled(&desc->irq_data) &&
670 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
671 chip->irq_eoi(&desc->irq_data);
673 } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
674 chip->irq_eoi(&desc->irq_data);
679 * handle_fasteoi_irq - irq handler for transparent controllers
680 * @desc: the interrupt description structure for this irq
682 * Only a single callback will be issued to the chip: an ->eoi()
683 * call when the interrupt has been serviced. This enables support
684 * for modern forms of interrupt handlers, which handle the flow
685 * details in hardware, transparently.
687 void handle_fasteoi_irq(struct irq_desc *desc)
689 struct irq_chip *chip = desc->irq_data.chip;
691 raw_spin_lock(&desc->lock);
693 if (!irq_may_run(desc))
696 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
699 * If its disabled or no action available
700 * then mask it and get out of here:
702 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
703 desc->istate |= IRQS_PENDING;
708 kstat_incr_irqs_this_cpu(desc);
709 if (desc->istate & IRQS_ONESHOT)
712 handle_irq_event(desc);
714 cond_unmask_eoi_irq(desc, chip);
716 raw_spin_unlock(&desc->lock);
719 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
720 chip->irq_eoi(&desc->irq_data);
721 raw_spin_unlock(&desc->lock);
723 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
726 * handle_fasteoi_nmi - irq handler for NMI interrupt lines
727 * @desc: the interrupt description structure for this irq
729 * A simple NMI-safe handler, considering the restrictions
732 * Only a single callback will be issued to the chip: an ->eoi()
733 * call when the interrupt has been serviced. This enables support
734 * for modern forms of interrupt handlers, which handle the flow
735 * details in hardware, transparently.
737 void handle_fasteoi_nmi(struct irq_desc *desc)
739 struct irq_chip *chip = irq_desc_get_chip(desc);
740 struct irqaction *action = desc->action;
741 unsigned int irq = irq_desc_get_irq(desc);
744 __kstat_incr_irqs_this_cpu(desc);
746 trace_irq_handler_entry(irq, action);
748 * NMIs cannot be shared, there is only one action.
750 res = action->handler(irq, action->dev_id);
751 trace_irq_handler_exit(irq, action, res);
754 chip->irq_eoi(&desc->irq_data);
756 EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);
759 * handle_edge_irq - edge type IRQ handler
760 * @desc: the interrupt description structure for this irq
762 * Interrupt occurs on the falling and/or rising edge of a hardware
763 * signal. The occurrence is latched into the irq controller hardware
764 * and must be acked in order to be reenabled. After the ack another
765 * interrupt can happen on the same source even before the first one
766 * is handled by the associated event handler. If this happens it
767 * might be necessary to disable (mask) the interrupt depending on the
768 * controller hardware. This requires to reenable the interrupt inside
769 * of the loop which handles the interrupts which have arrived while
770 * the handler was running. If all pending interrupts are handled, the
773 void handle_edge_irq(struct irq_desc *desc)
775 raw_spin_lock(&desc->lock);
777 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
779 if (!irq_may_run(desc)) {
780 desc->istate |= IRQS_PENDING;
786 * If its disabled or no action available then mask it and get
789 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
790 desc->istate |= IRQS_PENDING;
795 kstat_incr_irqs_this_cpu(desc);
797 /* Start handling the irq */
798 desc->irq_data.chip->irq_ack(&desc->irq_data);
801 if (unlikely(!desc->action)) {
807 * When another irq arrived while we were handling
808 * one, we could have masked the irq.
809 * Reenable it, if it was not disabled in meantime.
811 if (unlikely(desc->istate & IRQS_PENDING)) {
812 if (!irqd_irq_disabled(&desc->irq_data) &&
813 irqd_irq_masked(&desc->irq_data))
817 handle_irq_event(desc);
819 } while ((desc->istate & IRQS_PENDING) &&
820 !irqd_irq_disabled(&desc->irq_data));
823 raw_spin_unlock(&desc->lock);
825 EXPORT_SYMBOL(handle_edge_irq);
827 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
829 * handle_edge_eoi_irq - edge eoi type IRQ handler
830 * @desc: the interrupt description structure for this irq
832 * Similar as the above handle_edge_irq, but using eoi and w/o the
835 void handle_edge_eoi_irq(struct irq_desc *desc)
837 struct irq_chip *chip = irq_desc_get_chip(desc);
839 raw_spin_lock(&desc->lock);
841 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
843 if (!irq_may_run(desc)) {
844 desc->istate |= IRQS_PENDING;
849 * If its disabled or no action available then mask it and get
852 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
853 desc->istate |= IRQS_PENDING;
857 kstat_incr_irqs_this_cpu(desc);
860 if (unlikely(!desc->action))
863 handle_irq_event(desc);
865 } while ((desc->istate & IRQS_PENDING) &&
866 !irqd_irq_disabled(&desc->irq_data));
869 chip->irq_eoi(&desc->irq_data);
870 raw_spin_unlock(&desc->lock);
875 * handle_percpu_irq - Per CPU local irq handler
876 * @desc: the interrupt description structure for this irq
878 * Per CPU interrupts on SMP machines without locking requirements
880 void handle_percpu_irq(struct irq_desc *desc)
882 struct irq_chip *chip = irq_desc_get_chip(desc);
885 * PER CPU interrupts are not serialized. Do not touch
888 __kstat_incr_irqs_this_cpu(desc);
891 chip->irq_ack(&desc->irq_data);
893 handle_irq_event_percpu(desc);
896 chip->irq_eoi(&desc->irq_data);
900 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
901 * @desc: the interrupt description structure for this irq
903 * Per CPU interrupts on SMP machines without locking requirements. Same as
904 * handle_percpu_irq() above but with the following extras:
906 * action->percpu_dev_id is a pointer to percpu variables which
907 * contain the real device id for the cpu on which this handler is
910 void handle_percpu_devid_irq(struct irq_desc *desc)
912 struct irq_chip *chip = irq_desc_get_chip(desc);
913 struct irqaction *action = desc->action;
914 unsigned int irq = irq_desc_get_irq(desc);
918 * PER CPU interrupts are not serialized. Do not touch
921 __kstat_incr_irqs_this_cpu(desc);
924 chip->irq_ack(&desc->irq_data);
926 if (likely(action)) {
927 trace_irq_handler_entry(irq, action);
928 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
929 trace_irq_handler_exit(irq, action, res);
931 unsigned int cpu = smp_processor_id();
932 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
935 irq_percpu_disable(desc, cpu);
937 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
938 enabled ? " and unmasked" : "", irq, cpu);
942 chip->irq_eoi(&desc->irq_data);
946 * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
948 * @desc: the interrupt description structure for this irq
950 * Similar to handle_fasteoi_nmi, but handling the dev_id cookie
951 * as a percpu pointer.
953 void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
955 struct irq_chip *chip = irq_desc_get_chip(desc);
956 struct irqaction *action = desc->action;
957 unsigned int irq = irq_desc_get_irq(desc);
960 __kstat_incr_irqs_this_cpu(desc);
962 trace_irq_handler_entry(irq, action);
963 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
964 trace_irq_handler_exit(irq, action, res);
967 chip->irq_eoi(&desc->irq_data);
971 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
972 int is_chained, const char *name)
975 handle = handle_bad_irq;
977 struct irq_data *irq_data = &desc->irq_data;
978 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
980 * With hierarchical domains we might run into a
981 * situation where the outermost chip is not yet set
982 * up, but the inner chips are there. Instead of
983 * bailing we install the handler, but obviously we
984 * cannot enable/startup the interrupt at this point.
987 if (irq_data->chip != &no_irq_chip)
990 * Bail out if the outer chip is not set up
991 * and the interrupt supposed to be started
994 if (WARN_ON(is_chained))
997 irq_data = irq_data->parent_data;
1000 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
1005 if (handle == handle_bad_irq) {
1006 if (desc->irq_data.chip != &no_irq_chip)
1008 irq_state_set_disabled(desc);
1010 desc->action = NULL;
1013 desc->handle_irq = handle;
1016 if (handle != handle_bad_irq && is_chained) {
1017 unsigned int type = irqd_get_trigger_type(&desc->irq_data);
1020 * We're about to start this interrupt immediately,
1021 * hence the need to set the trigger configuration.
1022 * But the .set_type callback may have overridden the
1023 * flow handler, ignoring that we're dealing with a
1024 * chained interrupt. Reset it immediately because we
1027 if (type != IRQ_TYPE_NONE) {
1028 __irq_set_trigger(desc, type);
1029 desc->handle_irq = handle;
1032 irq_settings_set_noprobe(desc);
1033 irq_settings_set_norequest(desc);
1034 irq_settings_set_nothread(desc);
1035 desc->action = &chained_action;
1036 irq_activate_and_startup(desc, IRQ_RESEND);
1041 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1044 unsigned long flags;
1045 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1050 __irq_do_set_handler(desc, handle, is_chained, name);
1051 irq_put_desc_busunlock(desc, flags);
1053 EXPORT_SYMBOL_GPL(__irq_set_handler);
1056 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1059 unsigned long flags;
1060 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1065 desc->irq_common_data.handler_data = data;
1066 __irq_do_set_handler(desc, handle, 1, NULL);
1068 irq_put_desc_busunlock(desc, flags);
1070 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1073 irq_set_chip_and_handler_name(unsigned int irq, const struct irq_chip *chip,
1074 irq_flow_handler_t handle, const char *name)
1076 irq_set_chip(irq, chip);
1077 __irq_set_handler(irq, handle, 0, name);
1079 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1081 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1083 unsigned long flags, trigger, tmp;
1084 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1090 * Warn when a driver sets the no autoenable flag on an already
1093 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1095 irq_settings_clr_and_set(desc, clr, set);
1097 trigger = irqd_get_trigger_type(&desc->irq_data);
1099 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1100 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1101 if (irq_settings_has_no_balance_set(desc))
1102 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1103 if (irq_settings_is_per_cpu(desc))
1104 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1105 if (irq_settings_can_move_pcntxt(desc))
1106 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1107 if (irq_settings_is_level(desc))
1108 irqd_set(&desc->irq_data, IRQD_LEVEL);
1110 tmp = irq_settings_get_trigger_mask(desc);
1111 if (tmp != IRQ_TYPE_NONE)
1114 irqd_set(&desc->irq_data, trigger);
1116 irq_put_desc_unlock(desc, flags);
1118 EXPORT_SYMBOL_GPL(irq_modify_status);
1120 #ifdef CONFIG_DEPRECATED_IRQ_CPU_ONOFFLINE
1122 * irq_cpu_online - Invoke all irq_cpu_online functions.
1124 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1127 void irq_cpu_online(void)
1129 struct irq_desc *desc;
1130 struct irq_chip *chip;
1131 unsigned long flags;
1134 for_each_active_irq(irq) {
1135 desc = irq_to_desc(irq);
1139 raw_spin_lock_irqsave(&desc->lock, flags);
1141 chip = irq_data_get_irq_chip(&desc->irq_data);
1142 if (chip && chip->irq_cpu_online &&
1143 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1144 !irqd_irq_disabled(&desc->irq_data)))
1145 chip->irq_cpu_online(&desc->irq_data);
1147 raw_spin_unlock_irqrestore(&desc->lock, flags);
1152 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1154 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1157 void irq_cpu_offline(void)
1159 struct irq_desc *desc;
1160 struct irq_chip *chip;
1161 unsigned long flags;
1164 for_each_active_irq(irq) {
1165 desc = irq_to_desc(irq);
1169 raw_spin_lock_irqsave(&desc->lock, flags);
1171 chip = irq_data_get_irq_chip(&desc->irq_data);
1172 if (chip && chip->irq_cpu_offline &&
1173 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1174 !irqd_irq_disabled(&desc->irq_data)))
1175 chip->irq_cpu_offline(&desc->irq_data);
1177 raw_spin_unlock_irqrestore(&desc->lock, flags);
1182 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1184 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1186 * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1187 * stacked on transparent controllers
1189 * @desc: the interrupt description structure for this irq
1191 * Like handle_fasteoi_irq(), but for use with hierarchy where
1192 * the irq_chip also needs to have its ->irq_ack() function
1195 void handle_fasteoi_ack_irq(struct irq_desc *desc)
1197 struct irq_chip *chip = desc->irq_data.chip;
1199 raw_spin_lock(&desc->lock);
1201 if (!irq_may_run(desc))
1204 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1207 * If its disabled or no action available
1208 * then mask it and get out of here:
1210 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1211 desc->istate |= IRQS_PENDING;
1216 kstat_incr_irqs_this_cpu(desc);
1217 if (desc->istate & IRQS_ONESHOT)
1220 /* Start handling the irq */
1221 desc->irq_data.chip->irq_ack(&desc->irq_data);
1223 handle_irq_event(desc);
1225 cond_unmask_eoi_irq(desc, chip);
1227 raw_spin_unlock(&desc->lock);
1230 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1231 chip->irq_eoi(&desc->irq_data);
1232 raw_spin_unlock(&desc->lock);
1234 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1237 * handle_fasteoi_mask_irq - irq handler for level hierarchy
1238 * stacked on transparent controllers
1240 * @desc: the interrupt description structure for this irq
1242 * Like handle_fasteoi_irq(), but for use with hierarchy where
1243 * the irq_chip also needs to have its ->irq_mask_ack() function
1246 void handle_fasteoi_mask_irq(struct irq_desc *desc)
1248 struct irq_chip *chip = desc->irq_data.chip;
1250 raw_spin_lock(&desc->lock);
1253 if (!irq_may_run(desc))
1256 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1259 * If its disabled or no action available
1260 * then mask it and get out of here:
1262 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1263 desc->istate |= IRQS_PENDING;
1268 kstat_incr_irqs_this_cpu(desc);
1269 if (desc->istate & IRQS_ONESHOT)
1272 handle_irq_event(desc);
1274 cond_unmask_eoi_irq(desc, chip);
1276 raw_spin_unlock(&desc->lock);
1279 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1280 chip->irq_eoi(&desc->irq_data);
1281 raw_spin_unlock(&desc->lock);
1283 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1285 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1288 * irq_chip_set_parent_state - set the state of a parent interrupt.
1290 * @data: Pointer to interrupt specific data
1291 * @which: State to be restored (one of IRQCHIP_STATE_*)
1292 * @val: Value corresponding to @which
1294 * Conditional success, if the underlying irqchip does not implement it.
1296 int irq_chip_set_parent_state(struct irq_data *data,
1297 enum irqchip_irq_state which,
1300 data = data->parent_data;
1302 if (!data || !data->chip->irq_set_irqchip_state)
1305 return data->chip->irq_set_irqchip_state(data, which, val);
1307 EXPORT_SYMBOL_GPL(irq_chip_set_parent_state);
1310 * irq_chip_get_parent_state - get the state of a parent interrupt.
1312 * @data: Pointer to interrupt specific data
1313 * @which: one of IRQCHIP_STATE_* the caller wants to know
1314 * @state: a pointer to a boolean where the state is to be stored
1316 * Conditional success, if the underlying irqchip does not implement it.
1318 int irq_chip_get_parent_state(struct irq_data *data,
1319 enum irqchip_irq_state which,
1322 data = data->parent_data;
1324 if (!data || !data->chip->irq_get_irqchip_state)
1327 return data->chip->irq_get_irqchip_state(data, which, state);
1329 EXPORT_SYMBOL_GPL(irq_chip_get_parent_state);
1332 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1334 * @data: Pointer to interrupt specific data
1336 void irq_chip_enable_parent(struct irq_data *data)
1338 data = data->parent_data;
1339 if (data->chip->irq_enable)
1340 data->chip->irq_enable(data);
1342 data->chip->irq_unmask(data);
1344 EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1347 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1349 * @data: Pointer to interrupt specific data
1351 void irq_chip_disable_parent(struct irq_data *data)
1353 data = data->parent_data;
1354 if (data->chip->irq_disable)
1355 data->chip->irq_disable(data);
1357 data->chip->irq_mask(data);
1359 EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1362 * irq_chip_ack_parent - Acknowledge the parent interrupt
1363 * @data: Pointer to interrupt specific data
1365 void irq_chip_ack_parent(struct irq_data *data)
1367 data = data->parent_data;
1368 data->chip->irq_ack(data);
1370 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1373 * irq_chip_mask_parent - Mask the parent interrupt
1374 * @data: Pointer to interrupt specific data
1376 void irq_chip_mask_parent(struct irq_data *data)
1378 data = data->parent_data;
1379 data->chip->irq_mask(data);
1381 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1384 * irq_chip_mask_ack_parent - Mask and acknowledge the parent interrupt
1385 * @data: Pointer to interrupt specific data
1387 void irq_chip_mask_ack_parent(struct irq_data *data)
1389 data = data->parent_data;
1390 data->chip->irq_mask_ack(data);
1392 EXPORT_SYMBOL_GPL(irq_chip_mask_ack_parent);
1395 * irq_chip_unmask_parent - Unmask the parent interrupt
1396 * @data: Pointer to interrupt specific data
1398 void irq_chip_unmask_parent(struct irq_data *data)
1400 data = data->parent_data;
1401 data->chip->irq_unmask(data);
1403 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1406 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1407 * @data: Pointer to interrupt specific data
1409 void irq_chip_eoi_parent(struct irq_data *data)
1411 data = data->parent_data;
1412 data->chip->irq_eoi(data);
1414 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1417 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1418 * @data: Pointer to interrupt specific data
1419 * @dest: The affinity mask to set
1420 * @force: Flag to enforce setting (disable online checks)
1422 * Conditional, as the underlying parent chip might not implement it.
1424 int irq_chip_set_affinity_parent(struct irq_data *data,
1425 const struct cpumask *dest, bool force)
1427 data = data->parent_data;
1428 if (data->chip->irq_set_affinity)
1429 return data->chip->irq_set_affinity(data, dest, force);
1433 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1436 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1437 * @data: Pointer to interrupt specific data
1438 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1440 * Conditional, as the underlying parent chip might not implement it.
1442 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1444 data = data->parent_data;
1446 if (data->chip->irq_set_type)
1447 return data->chip->irq_set_type(data, type);
1451 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1454 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1455 * @data: Pointer to interrupt specific data
1457 * Iterate through the domain hierarchy of the interrupt and check
1458 * whether a hw retrigger function exists. If yes, invoke it.
1460 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1462 for (data = data->parent_data; data; data = data->parent_data)
1463 if (data->chip && data->chip->irq_retrigger)
1464 return data->chip->irq_retrigger(data);
1468 EXPORT_SYMBOL_GPL(irq_chip_retrigger_hierarchy);
1471 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1472 * @data: Pointer to interrupt specific data
1473 * @vcpu_info: The vcpu affinity information
1475 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1477 data = data->parent_data;
1478 if (data->chip->irq_set_vcpu_affinity)
1479 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1483 EXPORT_SYMBOL_GPL(irq_chip_set_vcpu_affinity_parent);
1485 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1486 * @data: Pointer to interrupt specific data
1487 * @on: Whether to set or reset the wake-up capability of this irq
1489 * Conditional, as the underlying parent chip might not implement it.
1491 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1493 data = data->parent_data;
1495 if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1498 if (data->chip->irq_set_wake)
1499 return data->chip->irq_set_wake(data, on);
1503 EXPORT_SYMBOL_GPL(irq_chip_set_wake_parent);
1506 * irq_chip_request_resources_parent - Request resources on the parent interrupt
1507 * @data: Pointer to interrupt specific data
1509 int irq_chip_request_resources_parent(struct irq_data *data)
1511 data = data->parent_data;
1513 if (data->chip->irq_request_resources)
1514 return data->chip->irq_request_resources(data);
1518 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);
1521 * irq_chip_release_resources_parent - Release resources on the parent interrupt
1522 * @data: Pointer to interrupt specific data
1524 void irq_chip_release_resources_parent(struct irq_data *data)
1526 data = data->parent_data;
1527 if (data->chip->irq_release_resources)
1528 data->chip->irq_release_resources(data);
1530 EXPORT_SYMBOL_GPL(irq_chip_release_resources_parent);
1534 * irq_chip_compose_msi_msg - Compose msi message for a irq chip
1535 * @data: Pointer to interrupt specific data
1536 * @msg: Pointer to the MSI message
1538 * For hierarchical domains we find the first chip in the hierarchy
1539 * which implements the irq_compose_msi_msg callback. For non
1540 * hierarchical we use the top level chip.
1542 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1544 struct irq_data *pos;
1546 for (pos = NULL; !pos && data; data = irqd_get_parent_data(data)) {
1547 if (data->chip && data->chip->irq_compose_msi_msg)
1554 pos->chip->irq_compose_msi_msg(pos, msg);
1558 static struct device *irq_get_parent_device(struct irq_data *data)
1561 return data->domain->dev;
1567 * irq_chip_pm_get - Enable power for an IRQ chip
1568 * @data: Pointer to interrupt specific data
1570 * Enable the power to the IRQ chip referenced by the interrupt data
1573 int irq_chip_pm_get(struct irq_data *data)
1575 struct device *dev = irq_get_parent_device(data);
1578 if (IS_ENABLED(CONFIG_PM) && dev) {
1579 retval = pm_runtime_get_sync(dev);
1581 pm_runtime_put_noidle(dev);
1590 * irq_chip_pm_put - Disable power for an IRQ chip
1591 * @data: Pointer to interrupt specific data
1593 * Disable the power to the IRQ chip referenced by the interrupt data
1594 * structure, belongs. Note that power will only be disabled, once this
1595 * function has been called for all IRQs that have called irq_chip_pm_get().
1597 int irq_chip_pm_put(struct irq_data *data)
1599 struct device *dev = irq_get_parent_device(data);
1602 if (IS_ENABLED(CONFIG_PM) && dev)
1603 retval = pm_runtime_put(dev);
1605 return (retval < 0) ? retval : 0;