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, const struct cpumask *aff,
194 struct irq_data *d = irq_desc_get_irq_data(desc);
196 if (!irqd_affinity_is_managed(d))
197 return IRQ_STARTUP_NORMAL;
199 irqd_clr_managed_shutdown(d);
201 if (cpumask_any_and(aff, cpu_online_mask) >= nr_cpu_ids) {
203 * Catch code which fiddles with enable_irq() on a managed
204 * and potentially shutdown IRQ. Chained interrupt
205 * installment or irq auto probing should not happen on
206 * managed irqs either.
208 if (WARN_ON_ONCE(force))
209 return IRQ_STARTUP_ABORT;
211 * The interrupt was requested, but there is no online CPU
212 * in it's affinity mask. Put it into managed shutdown
213 * state and let the cpu hotplug mechanism start it up once
214 * a CPU in the mask becomes available.
216 return IRQ_STARTUP_ABORT;
219 * Managed interrupts have reserved resources, so this should not
222 if (WARN_ON(irq_domain_activate_irq(d, false)))
223 return IRQ_STARTUP_ABORT;
224 return IRQ_STARTUP_MANAGED;
227 static __always_inline int
228 __irq_startup_managed(struct irq_desc *desc, const struct cpumask *aff,
231 return IRQ_STARTUP_NORMAL;
235 static int __irq_startup(struct irq_desc *desc)
237 struct irq_data *d = irq_desc_get_irq_data(desc);
240 /* Warn if this interrupt is not activated but try nevertheless */
241 WARN_ON_ONCE(!irqd_is_activated(d));
243 if (d->chip->irq_startup) {
244 ret = d->chip->irq_startup(d);
245 irq_state_clr_disabled(desc);
246 irq_state_clr_masked(desc);
250 irq_state_set_started(desc);
254 int irq_startup(struct irq_desc *desc, bool resend, bool force)
256 struct irq_data *d = irq_desc_get_irq_data(desc);
257 const struct cpumask *aff = irq_data_get_affinity_mask(d);
262 if (irqd_is_started(d)) {
265 switch (__irq_startup_managed(desc, aff, force)) {
266 case IRQ_STARTUP_NORMAL:
267 if (d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP)
268 irq_setup_affinity(desc);
269 ret = __irq_startup(desc);
270 if (!(d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP))
271 irq_setup_affinity(desc);
273 case IRQ_STARTUP_MANAGED:
274 irq_do_set_affinity(d, aff, false);
275 ret = __irq_startup(desc);
277 case IRQ_STARTUP_ABORT:
278 irqd_set_managed_shutdown(d);
283 check_irq_resend(desc, false);
288 int irq_activate(struct irq_desc *desc)
290 struct irq_data *d = irq_desc_get_irq_data(desc);
292 if (!irqd_affinity_is_managed(d))
293 return irq_domain_activate_irq(d, false);
297 int irq_activate_and_startup(struct irq_desc *desc, bool resend)
299 if (WARN_ON(irq_activate(desc)))
301 return irq_startup(desc, resend, IRQ_START_FORCE);
304 static void __irq_disable(struct irq_desc *desc, bool mask);
306 void irq_shutdown(struct irq_desc *desc)
308 if (irqd_is_started(&desc->irq_data)) {
309 clear_irq_resend(desc);
311 if (desc->irq_data.chip->irq_shutdown) {
312 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
313 irq_state_set_disabled(desc);
314 irq_state_set_masked(desc);
316 __irq_disable(desc, true);
318 irq_state_clr_started(desc);
323 void irq_shutdown_and_deactivate(struct irq_desc *desc)
327 * This must be called even if the interrupt was never started up,
328 * because the activation can happen before the interrupt is
329 * available for request/startup. It has it's own state tracking so
330 * it's safe to call it unconditionally.
332 irq_domain_deactivate_irq(&desc->irq_data);
335 void irq_enable(struct irq_desc *desc)
337 if (!irqd_irq_disabled(&desc->irq_data)) {
340 irq_state_clr_disabled(desc);
341 if (desc->irq_data.chip->irq_enable) {
342 desc->irq_data.chip->irq_enable(&desc->irq_data);
343 irq_state_clr_masked(desc);
350 static void __irq_disable(struct irq_desc *desc, bool mask)
352 if (irqd_irq_disabled(&desc->irq_data)) {
356 irq_state_set_disabled(desc);
357 if (desc->irq_data.chip->irq_disable) {
358 desc->irq_data.chip->irq_disable(&desc->irq_data);
359 irq_state_set_masked(desc);
367 * irq_disable - Mark interrupt disabled
368 * @desc: irq descriptor which should be disabled
370 * If the chip does not implement the irq_disable callback, we
371 * use a lazy disable approach. That means we mark the interrupt
372 * disabled, but leave the hardware unmasked. That's an
373 * optimization because we avoid the hardware access for the
374 * common case where no interrupt happens after we marked it
375 * disabled. If an interrupt happens, then the interrupt flow
376 * handler masks the line at the hardware level and marks it
379 * If the interrupt chip does not implement the irq_disable callback,
380 * a driver can disable the lazy approach for a particular irq line by
381 * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
382 * be used for devices which cannot disable the interrupt at the
383 * device level under certain circumstances and have to use
384 * disable_irq[_nosync] instead.
386 void irq_disable(struct irq_desc *desc)
388 __irq_disable(desc, irq_settings_disable_unlazy(desc));
391 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
393 if (desc->irq_data.chip->irq_enable)
394 desc->irq_data.chip->irq_enable(&desc->irq_data);
396 desc->irq_data.chip->irq_unmask(&desc->irq_data);
397 cpumask_set_cpu(cpu, desc->percpu_enabled);
400 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
402 if (desc->irq_data.chip->irq_disable)
403 desc->irq_data.chip->irq_disable(&desc->irq_data);
405 desc->irq_data.chip->irq_mask(&desc->irq_data);
406 cpumask_clear_cpu(cpu, desc->percpu_enabled);
409 static inline void mask_ack_irq(struct irq_desc *desc)
411 if (desc->irq_data.chip->irq_mask_ack) {
412 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
413 irq_state_set_masked(desc);
416 if (desc->irq_data.chip->irq_ack)
417 desc->irq_data.chip->irq_ack(&desc->irq_data);
421 void mask_irq(struct irq_desc *desc)
423 if (irqd_irq_masked(&desc->irq_data))
426 if (desc->irq_data.chip->irq_mask) {
427 desc->irq_data.chip->irq_mask(&desc->irq_data);
428 irq_state_set_masked(desc);
432 void unmask_irq(struct irq_desc *desc)
434 if (!irqd_irq_masked(&desc->irq_data))
437 if (desc->irq_data.chip->irq_unmask) {
438 desc->irq_data.chip->irq_unmask(&desc->irq_data);
439 irq_state_clr_masked(desc);
443 void unmask_threaded_irq(struct irq_desc *desc)
445 struct irq_chip *chip = desc->irq_data.chip;
447 if (chip->flags & IRQCHIP_EOI_THREADED)
448 chip->irq_eoi(&desc->irq_data);
454 * handle_nested_irq - Handle a nested irq from a irq thread
455 * @irq: the interrupt number
457 * Handle interrupts which are nested into a threaded interrupt
458 * handler. The handler function is called inside the calling
461 void handle_nested_irq(unsigned int irq)
463 struct irq_desc *desc = irq_to_desc(irq);
464 struct irqaction *action;
465 irqreturn_t action_ret;
469 raw_spin_lock_irq(&desc->lock);
471 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
473 action = desc->action;
474 if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
475 desc->istate |= IRQS_PENDING;
479 kstat_incr_irqs_this_cpu(desc);
480 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
481 raw_spin_unlock_irq(&desc->lock);
483 action_ret = IRQ_NONE;
484 for_each_action_of_desc(desc, action)
485 action_ret |= action->thread_fn(action->irq, action->dev_id);
487 if (!irq_settings_no_debug(desc))
488 note_interrupt(desc, action_ret);
490 raw_spin_lock_irq(&desc->lock);
491 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
494 raw_spin_unlock_irq(&desc->lock);
496 EXPORT_SYMBOL_GPL(handle_nested_irq);
498 static bool irq_check_poll(struct irq_desc *desc)
500 if (!(desc->istate & IRQS_POLL_INPROGRESS))
502 return irq_wait_for_poll(desc);
505 static bool irq_may_run(struct irq_desc *desc)
507 unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
510 * If the interrupt is not in progress and is not an armed
511 * wakeup interrupt, proceed.
513 if (!irqd_has_set(&desc->irq_data, mask))
517 * If the interrupt is an armed wakeup source, mark it pending
518 * and suspended, disable it and notify the pm core about the
521 if (irq_pm_check_wakeup(desc))
525 * Handle a potential concurrent poll on a different core.
527 return irq_check_poll(desc);
531 * handle_simple_irq - Simple and software-decoded IRQs.
532 * @desc: the interrupt description structure for this irq
534 * Simple interrupts are either sent from a demultiplexing interrupt
535 * handler or come from hardware, where no interrupt hardware control
538 * Note: The caller is expected to handle the ack, clear, mask and
539 * unmask issues if necessary.
541 void handle_simple_irq(struct irq_desc *desc)
543 raw_spin_lock(&desc->lock);
545 if (!irq_may_run(desc))
548 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
550 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
551 desc->istate |= IRQS_PENDING;
555 kstat_incr_irqs_this_cpu(desc);
556 handle_irq_event(desc);
559 raw_spin_unlock(&desc->lock);
561 EXPORT_SYMBOL_GPL(handle_simple_irq);
564 * handle_untracked_irq - Simple and software-decoded IRQs.
565 * @desc: the interrupt description structure for this irq
567 * Untracked interrupts are sent from a demultiplexing interrupt
568 * handler when the demultiplexer does not know which device it its
569 * multiplexed irq domain generated the interrupt. IRQ's handled
570 * through here are not subjected to stats tracking, randomness, or
571 * spurious interrupt detection.
573 * Note: Like handle_simple_irq, the caller is expected to handle
574 * the ack, clear, mask and unmask issues if necessary.
576 void handle_untracked_irq(struct irq_desc *desc)
578 raw_spin_lock(&desc->lock);
580 if (!irq_may_run(desc))
583 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
585 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
586 desc->istate |= IRQS_PENDING;
590 desc->istate &= ~IRQS_PENDING;
591 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
592 raw_spin_unlock(&desc->lock);
594 __handle_irq_event_percpu(desc);
596 raw_spin_lock(&desc->lock);
597 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
600 raw_spin_unlock(&desc->lock);
602 EXPORT_SYMBOL_GPL(handle_untracked_irq);
605 * Called unconditionally from handle_level_irq() and only for oneshot
606 * interrupts from handle_fasteoi_irq()
608 static void cond_unmask_irq(struct irq_desc *desc)
611 * We need to unmask in the following cases:
612 * - Standard level irq (IRQF_ONESHOT is not set)
613 * - Oneshot irq which did not wake the thread (caused by a
614 * spurious interrupt or a primary handler handling it
617 if (!irqd_irq_disabled(&desc->irq_data) &&
618 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
623 * handle_level_irq - Level type irq handler
624 * @desc: the interrupt description structure for this irq
626 * Level type interrupts are active as long as the hardware line has
627 * the active level. This may require to mask the interrupt and unmask
628 * it after the associated handler has acknowledged the device, so the
629 * interrupt line is back to inactive.
631 void handle_level_irq(struct irq_desc *desc)
633 raw_spin_lock(&desc->lock);
636 if (!irq_may_run(desc))
639 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
642 * If its disabled or no action available
643 * keep it masked and get out of here
645 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
646 desc->istate |= IRQS_PENDING;
650 kstat_incr_irqs_this_cpu(desc);
651 handle_irq_event(desc);
653 cond_unmask_irq(desc);
656 raw_spin_unlock(&desc->lock);
658 EXPORT_SYMBOL_GPL(handle_level_irq);
660 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
662 if (!(desc->istate & IRQS_ONESHOT)) {
663 chip->irq_eoi(&desc->irq_data);
667 * We need to unmask in the following cases:
668 * - Oneshot irq which did not wake the thread (caused by a
669 * spurious interrupt or a primary handler handling it
672 if (!irqd_irq_disabled(&desc->irq_data) &&
673 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
674 chip->irq_eoi(&desc->irq_data);
676 } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
677 chip->irq_eoi(&desc->irq_data);
682 * handle_fasteoi_irq - irq handler for transparent controllers
683 * @desc: the interrupt description structure for this irq
685 * Only a single callback will be issued to the chip: an ->eoi()
686 * call when the interrupt has been serviced. This enables support
687 * for modern forms of interrupt handlers, which handle the flow
688 * details in hardware, transparently.
690 void handle_fasteoi_irq(struct irq_desc *desc)
692 struct irq_chip *chip = desc->irq_data.chip;
694 raw_spin_lock(&desc->lock);
697 * When an affinity change races with IRQ handling, the next interrupt
698 * can arrive on the new CPU before the original CPU has completed
699 * handling the previous one - it may need to be resent.
701 if (!irq_may_run(desc)) {
702 if (irqd_needs_resend_when_in_progress(&desc->irq_data))
703 desc->istate |= IRQS_PENDING;
707 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
710 * If its disabled or no action available
711 * then mask it and get out of here:
713 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
714 desc->istate |= IRQS_PENDING;
719 kstat_incr_irqs_this_cpu(desc);
720 if (desc->istate & IRQS_ONESHOT)
723 handle_irq_event(desc);
725 cond_unmask_eoi_irq(desc, chip);
728 * When the race described above happens this will resend the interrupt.
730 if (unlikely(desc->istate & IRQS_PENDING))
731 check_irq_resend(desc, false);
733 raw_spin_unlock(&desc->lock);
736 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
737 chip->irq_eoi(&desc->irq_data);
738 raw_spin_unlock(&desc->lock);
740 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
743 * handle_fasteoi_nmi - irq handler for NMI interrupt lines
744 * @desc: the interrupt description structure for this irq
746 * A simple NMI-safe handler, considering the restrictions
749 * Only a single callback will be issued to the chip: an ->eoi()
750 * call when the interrupt has been serviced. This enables support
751 * for modern forms of interrupt handlers, which handle the flow
752 * details in hardware, transparently.
754 void handle_fasteoi_nmi(struct irq_desc *desc)
756 struct irq_chip *chip = irq_desc_get_chip(desc);
757 struct irqaction *action = desc->action;
758 unsigned int irq = irq_desc_get_irq(desc);
761 __kstat_incr_irqs_this_cpu(desc);
763 trace_irq_handler_entry(irq, action);
765 * NMIs cannot be shared, there is only one action.
767 res = action->handler(irq, action->dev_id);
768 trace_irq_handler_exit(irq, action, res);
771 chip->irq_eoi(&desc->irq_data);
773 EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);
776 * handle_edge_irq - edge type IRQ handler
777 * @desc: the interrupt description structure for this irq
779 * Interrupt occurs on the falling and/or rising edge of a hardware
780 * signal. The occurrence is latched into the irq controller hardware
781 * and must be acked in order to be reenabled. After the ack another
782 * interrupt can happen on the same source even before the first one
783 * is handled by the associated event handler. If this happens it
784 * might be necessary to disable (mask) the interrupt depending on the
785 * controller hardware. This requires to reenable the interrupt inside
786 * of the loop which handles the interrupts which have arrived while
787 * the handler was running. If all pending interrupts are handled, the
790 void handle_edge_irq(struct irq_desc *desc)
792 raw_spin_lock(&desc->lock);
794 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
796 if (!irq_may_run(desc)) {
797 desc->istate |= IRQS_PENDING;
803 * If its disabled or no action available then mask it and get
806 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
807 desc->istate |= IRQS_PENDING;
812 kstat_incr_irqs_this_cpu(desc);
814 /* Start handling the irq */
815 desc->irq_data.chip->irq_ack(&desc->irq_data);
818 if (unlikely(!desc->action)) {
824 * When another irq arrived while we were handling
825 * one, we could have masked the irq.
826 * Reenable it, if it was not disabled in meantime.
828 if (unlikely(desc->istate & IRQS_PENDING)) {
829 if (!irqd_irq_disabled(&desc->irq_data) &&
830 irqd_irq_masked(&desc->irq_data))
834 handle_irq_event(desc);
836 } while ((desc->istate & IRQS_PENDING) &&
837 !irqd_irq_disabled(&desc->irq_data));
840 raw_spin_unlock(&desc->lock);
842 EXPORT_SYMBOL(handle_edge_irq);
844 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
846 * handle_edge_eoi_irq - edge eoi type IRQ handler
847 * @desc: the interrupt description structure for this irq
849 * Similar as the above handle_edge_irq, but using eoi and w/o the
852 void handle_edge_eoi_irq(struct irq_desc *desc)
854 struct irq_chip *chip = irq_desc_get_chip(desc);
856 raw_spin_lock(&desc->lock);
858 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
860 if (!irq_may_run(desc)) {
861 desc->istate |= IRQS_PENDING;
866 * If its disabled or no action available then mask it and get
869 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
870 desc->istate |= IRQS_PENDING;
874 kstat_incr_irqs_this_cpu(desc);
877 if (unlikely(!desc->action))
880 handle_irq_event(desc);
882 } while ((desc->istate & IRQS_PENDING) &&
883 !irqd_irq_disabled(&desc->irq_data));
886 chip->irq_eoi(&desc->irq_data);
887 raw_spin_unlock(&desc->lock);
892 * handle_percpu_irq - Per CPU local irq handler
893 * @desc: the interrupt description structure for this irq
895 * Per CPU interrupts on SMP machines without locking requirements
897 void handle_percpu_irq(struct irq_desc *desc)
899 struct irq_chip *chip = irq_desc_get_chip(desc);
902 * PER CPU interrupts are not serialized. Do not touch
905 __kstat_incr_irqs_this_cpu(desc);
908 chip->irq_ack(&desc->irq_data);
910 handle_irq_event_percpu(desc);
913 chip->irq_eoi(&desc->irq_data);
917 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
918 * @desc: the interrupt description structure for this irq
920 * Per CPU interrupts on SMP machines without locking requirements. Same as
921 * handle_percpu_irq() above but with the following extras:
923 * action->percpu_dev_id is a pointer to percpu variables which
924 * contain the real device id for the cpu on which this handler is
927 void handle_percpu_devid_irq(struct irq_desc *desc)
929 struct irq_chip *chip = irq_desc_get_chip(desc);
930 struct irqaction *action = desc->action;
931 unsigned int irq = irq_desc_get_irq(desc);
935 * PER CPU interrupts are not serialized. Do not touch
938 __kstat_incr_irqs_this_cpu(desc);
941 chip->irq_ack(&desc->irq_data);
943 if (likely(action)) {
944 trace_irq_handler_entry(irq, action);
945 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
946 trace_irq_handler_exit(irq, action, res);
948 unsigned int cpu = smp_processor_id();
949 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
952 irq_percpu_disable(desc, cpu);
954 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
955 enabled ? " and unmasked" : "", irq, cpu);
959 chip->irq_eoi(&desc->irq_data);
963 * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
965 * @desc: the interrupt description structure for this irq
967 * Similar to handle_fasteoi_nmi, but handling the dev_id cookie
968 * as a percpu pointer.
970 void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
972 struct irq_chip *chip = irq_desc_get_chip(desc);
973 struct irqaction *action = desc->action;
974 unsigned int irq = irq_desc_get_irq(desc);
977 __kstat_incr_irqs_this_cpu(desc);
979 trace_irq_handler_entry(irq, action);
980 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
981 trace_irq_handler_exit(irq, action, res);
984 chip->irq_eoi(&desc->irq_data);
988 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
989 int is_chained, const char *name)
992 handle = handle_bad_irq;
994 struct irq_data *irq_data = &desc->irq_data;
995 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
997 * With hierarchical domains we might run into a
998 * situation where the outermost chip is not yet set
999 * up, but the inner chips are there. Instead of
1000 * bailing we install the handler, but obviously we
1001 * cannot enable/startup the interrupt at this point.
1004 if (irq_data->chip != &no_irq_chip)
1007 * Bail out if the outer chip is not set up
1008 * and the interrupt supposed to be started
1011 if (WARN_ON(is_chained))
1013 /* Try the parent */
1014 irq_data = irq_data->parent_data;
1017 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
1022 if (handle == handle_bad_irq) {
1023 if (desc->irq_data.chip != &no_irq_chip)
1025 irq_state_set_disabled(desc);
1027 desc->action = NULL;
1028 WARN_ON(irq_chip_pm_put(irq_desc_get_irq_data(desc)));
1032 desc->handle_irq = handle;
1035 if (handle != handle_bad_irq && is_chained) {
1036 unsigned int type = irqd_get_trigger_type(&desc->irq_data);
1039 * We're about to start this interrupt immediately,
1040 * hence the need to set the trigger configuration.
1041 * But the .set_type callback may have overridden the
1042 * flow handler, ignoring that we're dealing with a
1043 * chained interrupt. Reset it immediately because we
1046 if (type != IRQ_TYPE_NONE) {
1047 __irq_set_trigger(desc, type);
1048 desc->handle_irq = handle;
1051 irq_settings_set_noprobe(desc);
1052 irq_settings_set_norequest(desc);
1053 irq_settings_set_nothread(desc);
1054 desc->action = &chained_action;
1055 WARN_ON(irq_chip_pm_get(irq_desc_get_irq_data(desc)));
1056 irq_activate_and_startup(desc, IRQ_RESEND);
1061 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1064 unsigned long flags;
1065 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1070 __irq_do_set_handler(desc, handle, is_chained, name);
1071 irq_put_desc_busunlock(desc, flags);
1073 EXPORT_SYMBOL_GPL(__irq_set_handler);
1076 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1079 unsigned long flags;
1080 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1085 desc->irq_common_data.handler_data = data;
1086 __irq_do_set_handler(desc, handle, 1, NULL);
1088 irq_put_desc_busunlock(desc, flags);
1090 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1093 irq_set_chip_and_handler_name(unsigned int irq, const struct irq_chip *chip,
1094 irq_flow_handler_t handle, const char *name)
1096 irq_set_chip(irq, chip);
1097 __irq_set_handler(irq, handle, 0, name);
1099 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1101 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1103 unsigned long flags, trigger, tmp;
1104 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1110 * Warn when a driver sets the no autoenable flag on an already
1113 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1115 irq_settings_clr_and_set(desc, clr, set);
1117 trigger = irqd_get_trigger_type(&desc->irq_data);
1119 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1120 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1121 if (irq_settings_has_no_balance_set(desc))
1122 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1123 if (irq_settings_is_per_cpu(desc))
1124 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1125 if (irq_settings_can_move_pcntxt(desc))
1126 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1127 if (irq_settings_is_level(desc))
1128 irqd_set(&desc->irq_data, IRQD_LEVEL);
1130 tmp = irq_settings_get_trigger_mask(desc);
1131 if (tmp != IRQ_TYPE_NONE)
1134 irqd_set(&desc->irq_data, trigger);
1136 irq_put_desc_unlock(desc, flags);
1138 EXPORT_SYMBOL_GPL(irq_modify_status);
1140 #ifdef CONFIG_DEPRECATED_IRQ_CPU_ONOFFLINE
1142 * irq_cpu_online - Invoke all irq_cpu_online functions.
1144 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1147 void irq_cpu_online(void)
1149 struct irq_desc *desc;
1150 struct irq_chip *chip;
1151 unsigned long flags;
1154 for_each_active_irq(irq) {
1155 desc = irq_to_desc(irq);
1159 raw_spin_lock_irqsave(&desc->lock, flags);
1161 chip = irq_data_get_irq_chip(&desc->irq_data);
1162 if (chip && chip->irq_cpu_online &&
1163 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1164 !irqd_irq_disabled(&desc->irq_data)))
1165 chip->irq_cpu_online(&desc->irq_data);
1167 raw_spin_unlock_irqrestore(&desc->lock, flags);
1172 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1174 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1177 void irq_cpu_offline(void)
1179 struct irq_desc *desc;
1180 struct irq_chip *chip;
1181 unsigned long flags;
1184 for_each_active_irq(irq) {
1185 desc = irq_to_desc(irq);
1189 raw_spin_lock_irqsave(&desc->lock, flags);
1191 chip = irq_data_get_irq_chip(&desc->irq_data);
1192 if (chip && chip->irq_cpu_offline &&
1193 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1194 !irqd_irq_disabled(&desc->irq_data)))
1195 chip->irq_cpu_offline(&desc->irq_data);
1197 raw_spin_unlock_irqrestore(&desc->lock, flags);
1202 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1204 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1206 * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1207 * stacked on transparent controllers
1209 * @desc: the interrupt description structure for this irq
1211 * Like handle_fasteoi_irq(), but for use with hierarchy where
1212 * the irq_chip also needs to have its ->irq_ack() function
1215 void handle_fasteoi_ack_irq(struct irq_desc *desc)
1217 struct irq_chip *chip = desc->irq_data.chip;
1219 raw_spin_lock(&desc->lock);
1221 if (!irq_may_run(desc))
1224 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1227 * If its disabled or no action available
1228 * then mask it and get out of here:
1230 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1231 desc->istate |= IRQS_PENDING;
1236 kstat_incr_irqs_this_cpu(desc);
1237 if (desc->istate & IRQS_ONESHOT)
1240 /* Start handling the irq */
1241 desc->irq_data.chip->irq_ack(&desc->irq_data);
1243 handle_irq_event(desc);
1245 cond_unmask_eoi_irq(desc, chip);
1247 raw_spin_unlock(&desc->lock);
1250 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1251 chip->irq_eoi(&desc->irq_data);
1252 raw_spin_unlock(&desc->lock);
1254 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1257 * handle_fasteoi_mask_irq - irq handler for level hierarchy
1258 * stacked on transparent controllers
1260 * @desc: the interrupt description structure for this irq
1262 * Like handle_fasteoi_irq(), but for use with hierarchy where
1263 * the irq_chip also needs to have its ->irq_mask_ack() function
1266 void handle_fasteoi_mask_irq(struct irq_desc *desc)
1268 struct irq_chip *chip = desc->irq_data.chip;
1270 raw_spin_lock(&desc->lock);
1273 if (!irq_may_run(desc))
1276 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1279 * If its disabled or no action available
1280 * then mask it and get out of here:
1282 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1283 desc->istate |= IRQS_PENDING;
1288 kstat_incr_irqs_this_cpu(desc);
1289 if (desc->istate & IRQS_ONESHOT)
1292 handle_irq_event(desc);
1294 cond_unmask_eoi_irq(desc, chip);
1296 raw_spin_unlock(&desc->lock);
1299 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1300 chip->irq_eoi(&desc->irq_data);
1301 raw_spin_unlock(&desc->lock);
1303 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1305 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1308 * irq_chip_set_parent_state - set the state of a parent interrupt.
1310 * @data: Pointer to interrupt specific data
1311 * @which: State to be restored (one of IRQCHIP_STATE_*)
1312 * @val: Value corresponding to @which
1314 * Conditional success, if the underlying irqchip does not implement it.
1316 int irq_chip_set_parent_state(struct irq_data *data,
1317 enum irqchip_irq_state which,
1320 data = data->parent_data;
1322 if (!data || !data->chip->irq_set_irqchip_state)
1325 return data->chip->irq_set_irqchip_state(data, which, val);
1327 EXPORT_SYMBOL_GPL(irq_chip_set_parent_state);
1330 * irq_chip_get_parent_state - get the state of a parent interrupt.
1332 * @data: Pointer to interrupt specific data
1333 * @which: one of IRQCHIP_STATE_* the caller wants to know
1334 * @state: a pointer to a boolean where the state is to be stored
1336 * Conditional success, if the underlying irqchip does not implement it.
1338 int irq_chip_get_parent_state(struct irq_data *data,
1339 enum irqchip_irq_state which,
1342 data = data->parent_data;
1344 if (!data || !data->chip->irq_get_irqchip_state)
1347 return data->chip->irq_get_irqchip_state(data, which, state);
1349 EXPORT_SYMBOL_GPL(irq_chip_get_parent_state);
1352 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1354 * @data: Pointer to interrupt specific data
1356 void irq_chip_enable_parent(struct irq_data *data)
1358 data = data->parent_data;
1359 if (data->chip->irq_enable)
1360 data->chip->irq_enable(data);
1362 data->chip->irq_unmask(data);
1364 EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1367 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1369 * @data: Pointer to interrupt specific data
1371 void irq_chip_disable_parent(struct irq_data *data)
1373 data = data->parent_data;
1374 if (data->chip->irq_disable)
1375 data->chip->irq_disable(data);
1377 data->chip->irq_mask(data);
1379 EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1382 * irq_chip_ack_parent - Acknowledge the parent interrupt
1383 * @data: Pointer to interrupt specific data
1385 void irq_chip_ack_parent(struct irq_data *data)
1387 data = data->parent_data;
1388 data->chip->irq_ack(data);
1390 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1393 * irq_chip_mask_parent - Mask the parent interrupt
1394 * @data: Pointer to interrupt specific data
1396 void irq_chip_mask_parent(struct irq_data *data)
1398 data = data->parent_data;
1399 data->chip->irq_mask(data);
1401 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1404 * irq_chip_mask_ack_parent - Mask and acknowledge the parent interrupt
1405 * @data: Pointer to interrupt specific data
1407 void irq_chip_mask_ack_parent(struct irq_data *data)
1409 data = data->parent_data;
1410 data->chip->irq_mask_ack(data);
1412 EXPORT_SYMBOL_GPL(irq_chip_mask_ack_parent);
1415 * irq_chip_unmask_parent - Unmask the parent interrupt
1416 * @data: Pointer to interrupt specific data
1418 void irq_chip_unmask_parent(struct irq_data *data)
1420 data = data->parent_data;
1421 data->chip->irq_unmask(data);
1423 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1426 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1427 * @data: Pointer to interrupt specific data
1429 void irq_chip_eoi_parent(struct irq_data *data)
1431 data = data->parent_data;
1432 data->chip->irq_eoi(data);
1434 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1437 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1438 * @data: Pointer to interrupt specific data
1439 * @dest: The affinity mask to set
1440 * @force: Flag to enforce setting (disable online checks)
1442 * Conditional, as the underlying parent chip might not implement it.
1444 int irq_chip_set_affinity_parent(struct irq_data *data,
1445 const struct cpumask *dest, bool force)
1447 data = data->parent_data;
1448 if (data->chip->irq_set_affinity)
1449 return data->chip->irq_set_affinity(data, dest, force);
1453 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1456 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1457 * @data: Pointer to interrupt specific data
1458 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1460 * Conditional, as the underlying parent chip might not implement it.
1462 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1464 data = data->parent_data;
1466 if (data->chip->irq_set_type)
1467 return data->chip->irq_set_type(data, type);
1471 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1474 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1475 * @data: Pointer to interrupt specific data
1477 * Iterate through the domain hierarchy of the interrupt and check
1478 * whether a hw retrigger function exists. If yes, invoke it.
1480 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1482 for (data = data->parent_data; data; data = data->parent_data)
1483 if (data->chip && data->chip->irq_retrigger)
1484 return data->chip->irq_retrigger(data);
1488 EXPORT_SYMBOL_GPL(irq_chip_retrigger_hierarchy);
1491 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1492 * @data: Pointer to interrupt specific data
1493 * @vcpu_info: The vcpu affinity information
1495 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1497 data = data->parent_data;
1498 if (data->chip->irq_set_vcpu_affinity)
1499 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1503 EXPORT_SYMBOL_GPL(irq_chip_set_vcpu_affinity_parent);
1505 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1506 * @data: Pointer to interrupt specific data
1507 * @on: Whether to set or reset the wake-up capability of this irq
1509 * Conditional, as the underlying parent chip might not implement it.
1511 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1513 data = data->parent_data;
1515 if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1518 if (data->chip->irq_set_wake)
1519 return data->chip->irq_set_wake(data, on);
1523 EXPORT_SYMBOL_GPL(irq_chip_set_wake_parent);
1526 * irq_chip_request_resources_parent - Request resources on the parent interrupt
1527 * @data: Pointer to interrupt specific data
1529 int irq_chip_request_resources_parent(struct irq_data *data)
1531 data = data->parent_data;
1533 if (data->chip->irq_request_resources)
1534 return data->chip->irq_request_resources(data);
1536 /* no error on missing optional irq_chip::irq_request_resources */
1539 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);
1542 * irq_chip_release_resources_parent - Release resources on the parent interrupt
1543 * @data: Pointer to interrupt specific data
1545 void irq_chip_release_resources_parent(struct irq_data *data)
1547 data = data->parent_data;
1548 if (data->chip->irq_release_resources)
1549 data->chip->irq_release_resources(data);
1551 EXPORT_SYMBOL_GPL(irq_chip_release_resources_parent);
1555 * irq_chip_compose_msi_msg - Compose msi message for a irq chip
1556 * @data: Pointer to interrupt specific data
1557 * @msg: Pointer to the MSI message
1559 * For hierarchical domains we find the first chip in the hierarchy
1560 * which implements the irq_compose_msi_msg callback. For non
1561 * hierarchical we use the top level chip.
1563 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1565 struct irq_data *pos;
1567 for (pos = NULL; !pos && data; data = irqd_get_parent_data(data)) {
1568 if (data->chip && data->chip->irq_compose_msi_msg)
1575 pos->chip->irq_compose_msi_msg(pos, msg);
1579 static struct device *irq_get_pm_device(struct irq_data *data)
1582 return data->domain->pm_dev;
1588 * irq_chip_pm_get - Enable power for an IRQ chip
1589 * @data: Pointer to interrupt specific data
1591 * Enable the power to the IRQ chip referenced by the interrupt data
1594 int irq_chip_pm_get(struct irq_data *data)
1596 struct device *dev = irq_get_pm_device(data);
1599 if (IS_ENABLED(CONFIG_PM) && dev)
1600 retval = pm_runtime_resume_and_get(dev);
1606 * irq_chip_pm_put - Disable power for an IRQ chip
1607 * @data: Pointer to interrupt specific data
1609 * Disable the power to the IRQ chip referenced by the interrupt data
1610 * structure, belongs. Note that power will only be disabled, once this
1611 * function has been called for all IRQs that have called irq_chip_pm_get().
1613 int irq_chip_pm_put(struct irq_data *data)
1615 struct device *dev = irq_get_pm_device(data);
1618 if (IS_ENABLED(CONFIG_PM) && dev)
1619 retval = pm_runtime_put(dev);
1621 return (retval < 0) ? retval : 0;