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;
476 raw_spin_unlock_irq(&desc->lock);
480 kstat_incr_irqs_this_cpu(desc);
481 atomic_inc(&desc->threads_active);
482 raw_spin_unlock_irq(&desc->lock);
484 action_ret = IRQ_NONE;
485 for_each_action_of_desc(desc, action)
486 action_ret |= action->thread_fn(action->irq, action->dev_id);
488 if (!irq_settings_no_debug(desc))
489 note_interrupt(desc, action_ret);
491 wake_threads_waitq(desc);
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);
694 * When an affinity change races with IRQ handling, the next interrupt
695 * can arrive on the new CPU before the original CPU has completed
696 * handling the previous one - it may need to be resent.
698 if (!irq_may_run(desc)) {
699 if (irqd_needs_resend_when_in_progress(&desc->irq_data))
700 desc->istate |= IRQS_PENDING;
704 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
707 * If its disabled or no action available
708 * then mask it and get out of here:
710 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
711 desc->istate |= IRQS_PENDING;
716 kstat_incr_irqs_this_cpu(desc);
717 if (desc->istate & IRQS_ONESHOT)
720 handle_irq_event(desc);
722 cond_unmask_eoi_irq(desc, chip);
725 * When the race described above happens this will resend the interrupt.
727 if (unlikely(desc->istate & IRQS_PENDING))
728 check_irq_resend(desc, false);
730 raw_spin_unlock(&desc->lock);
733 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
734 chip->irq_eoi(&desc->irq_data);
735 raw_spin_unlock(&desc->lock);
737 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
740 * handle_fasteoi_nmi - irq handler for NMI interrupt lines
741 * @desc: the interrupt description structure for this irq
743 * A simple NMI-safe handler, considering the restrictions
746 * Only a single callback will be issued to the chip: an ->eoi()
747 * call when the interrupt has been serviced. This enables support
748 * for modern forms of interrupt handlers, which handle the flow
749 * details in hardware, transparently.
751 void handle_fasteoi_nmi(struct irq_desc *desc)
753 struct irq_chip *chip = irq_desc_get_chip(desc);
754 struct irqaction *action = desc->action;
755 unsigned int irq = irq_desc_get_irq(desc);
758 __kstat_incr_irqs_this_cpu(desc);
760 trace_irq_handler_entry(irq, action);
762 * NMIs cannot be shared, there is only one action.
764 res = action->handler(irq, action->dev_id);
765 trace_irq_handler_exit(irq, action, res);
768 chip->irq_eoi(&desc->irq_data);
770 EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);
773 * handle_edge_irq - edge type IRQ handler
774 * @desc: the interrupt description structure for this irq
776 * Interrupt occurs on the falling and/or rising edge of a hardware
777 * signal. The occurrence is latched into the irq controller hardware
778 * and must be acked in order to be reenabled. After the ack another
779 * interrupt can happen on the same source even before the first one
780 * is handled by the associated event handler. If this happens it
781 * might be necessary to disable (mask) the interrupt depending on the
782 * controller hardware. This requires to reenable the interrupt inside
783 * of the loop which handles the interrupts which have arrived while
784 * the handler was running. If all pending interrupts are handled, the
787 void handle_edge_irq(struct irq_desc *desc)
789 raw_spin_lock(&desc->lock);
791 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
793 if (!irq_may_run(desc)) {
794 desc->istate |= IRQS_PENDING;
800 * If its disabled or no action available then mask it and get
803 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
804 desc->istate |= IRQS_PENDING;
809 kstat_incr_irqs_this_cpu(desc);
811 /* Start handling the irq */
812 desc->irq_data.chip->irq_ack(&desc->irq_data);
815 if (unlikely(!desc->action)) {
821 * When another irq arrived while we were handling
822 * one, we could have masked the irq.
823 * Reenable it, if it was not disabled in meantime.
825 if (unlikely(desc->istate & IRQS_PENDING)) {
826 if (!irqd_irq_disabled(&desc->irq_data) &&
827 irqd_irq_masked(&desc->irq_data))
831 handle_irq_event(desc);
833 } while ((desc->istate & IRQS_PENDING) &&
834 !irqd_irq_disabled(&desc->irq_data));
837 raw_spin_unlock(&desc->lock);
839 EXPORT_SYMBOL(handle_edge_irq);
841 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
843 * handle_edge_eoi_irq - edge eoi type IRQ handler
844 * @desc: the interrupt description structure for this irq
846 * Similar as the above handle_edge_irq, but using eoi and w/o the
849 void handle_edge_eoi_irq(struct irq_desc *desc)
851 struct irq_chip *chip = irq_desc_get_chip(desc);
853 raw_spin_lock(&desc->lock);
855 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
857 if (!irq_may_run(desc)) {
858 desc->istate |= IRQS_PENDING;
863 * If its disabled or no action available then mask it and get
866 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
867 desc->istate |= IRQS_PENDING;
871 kstat_incr_irqs_this_cpu(desc);
874 if (unlikely(!desc->action))
877 handle_irq_event(desc);
879 } while ((desc->istate & IRQS_PENDING) &&
880 !irqd_irq_disabled(&desc->irq_data));
883 chip->irq_eoi(&desc->irq_data);
884 raw_spin_unlock(&desc->lock);
889 * handle_percpu_irq - Per CPU local irq handler
890 * @desc: the interrupt description structure for this irq
892 * Per CPU interrupts on SMP machines without locking requirements
894 void handle_percpu_irq(struct irq_desc *desc)
896 struct irq_chip *chip = irq_desc_get_chip(desc);
899 * PER CPU interrupts are not serialized. Do not touch
902 __kstat_incr_irqs_this_cpu(desc);
905 chip->irq_ack(&desc->irq_data);
907 handle_irq_event_percpu(desc);
910 chip->irq_eoi(&desc->irq_data);
914 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
915 * @desc: the interrupt description structure for this irq
917 * Per CPU interrupts on SMP machines without locking requirements. Same as
918 * handle_percpu_irq() above but with the following extras:
920 * action->percpu_dev_id is a pointer to percpu variables which
921 * contain the real device id for the cpu on which this handler is
924 void handle_percpu_devid_irq(struct irq_desc *desc)
926 struct irq_chip *chip = irq_desc_get_chip(desc);
927 struct irqaction *action = desc->action;
928 unsigned int irq = irq_desc_get_irq(desc);
932 * PER CPU interrupts are not serialized. Do not touch
935 __kstat_incr_irqs_this_cpu(desc);
938 chip->irq_ack(&desc->irq_data);
940 if (likely(action)) {
941 trace_irq_handler_entry(irq, action);
942 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
943 trace_irq_handler_exit(irq, action, res);
945 unsigned int cpu = smp_processor_id();
946 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
949 irq_percpu_disable(desc, cpu);
951 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
952 enabled ? " and unmasked" : "", irq, cpu);
956 chip->irq_eoi(&desc->irq_data);
960 * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
962 * @desc: the interrupt description structure for this irq
964 * Similar to handle_fasteoi_nmi, but handling the dev_id cookie
965 * as a percpu pointer.
967 void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
969 struct irq_chip *chip = irq_desc_get_chip(desc);
970 struct irqaction *action = desc->action;
971 unsigned int irq = irq_desc_get_irq(desc);
974 __kstat_incr_irqs_this_cpu(desc);
976 trace_irq_handler_entry(irq, action);
977 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
978 trace_irq_handler_exit(irq, action, res);
981 chip->irq_eoi(&desc->irq_data);
985 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
986 int is_chained, const char *name)
989 handle = handle_bad_irq;
991 struct irq_data *irq_data = &desc->irq_data;
992 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
994 * With hierarchical domains we might run into a
995 * situation where the outermost chip is not yet set
996 * up, but the inner chips are there. Instead of
997 * bailing we install the handler, but obviously we
998 * cannot enable/startup the interrupt at this point.
1001 if (irq_data->chip != &no_irq_chip)
1004 * Bail out if the outer chip is not set up
1005 * and the interrupt supposed to be started
1008 if (WARN_ON(is_chained))
1010 /* Try the parent */
1011 irq_data = irq_data->parent_data;
1014 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
1019 if (handle == handle_bad_irq) {
1020 if (desc->irq_data.chip != &no_irq_chip)
1022 irq_state_set_disabled(desc);
1024 desc->action = NULL;
1025 WARN_ON(irq_chip_pm_put(irq_desc_get_irq_data(desc)));
1029 desc->handle_irq = handle;
1032 if (handle != handle_bad_irq && is_chained) {
1033 unsigned int type = irqd_get_trigger_type(&desc->irq_data);
1036 * We're about to start this interrupt immediately,
1037 * hence the need to set the trigger configuration.
1038 * But the .set_type callback may have overridden the
1039 * flow handler, ignoring that we're dealing with a
1040 * chained interrupt. Reset it immediately because we
1043 if (type != IRQ_TYPE_NONE) {
1044 __irq_set_trigger(desc, type);
1045 desc->handle_irq = handle;
1048 irq_settings_set_noprobe(desc);
1049 irq_settings_set_norequest(desc);
1050 irq_settings_set_nothread(desc);
1051 desc->action = &chained_action;
1052 WARN_ON(irq_chip_pm_get(irq_desc_get_irq_data(desc)));
1053 irq_activate_and_startup(desc, IRQ_RESEND);
1058 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1061 unsigned long flags;
1062 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1067 __irq_do_set_handler(desc, handle, is_chained, name);
1068 irq_put_desc_busunlock(desc, flags);
1070 EXPORT_SYMBOL_GPL(__irq_set_handler);
1073 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1076 unsigned long flags;
1077 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1082 desc->irq_common_data.handler_data = data;
1083 __irq_do_set_handler(desc, handle, 1, NULL);
1085 irq_put_desc_busunlock(desc, flags);
1087 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1090 irq_set_chip_and_handler_name(unsigned int irq, const struct irq_chip *chip,
1091 irq_flow_handler_t handle, const char *name)
1093 irq_set_chip(irq, chip);
1094 __irq_set_handler(irq, handle, 0, name);
1096 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1098 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1100 unsigned long flags, trigger, tmp;
1101 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1107 * Warn when a driver sets the no autoenable flag on an already
1110 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1112 irq_settings_clr_and_set(desc, clr, set);
1114 trigger = irqd_get_trigger_type(&desc->irq_data);
1116 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1117 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1118 if (irq_settings_has_no_balance_set(desc))
1119 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1120 if (irq_settings_is_per_cpu(desc))
1121 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1122 if (irq_settings_can_move_pcntxt(desc))
1123 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1124 if (irq_settings_is_level(desc))
1125 irqd_set(&desc->irq_data, IRQD_LEVEL);
1127 tmp = irq_settings_get_trigger_mask(desc);
1128 if (tmp != IRQ_TYPE_NONE)
1131 irqd_set(&desc->irq_data, trigger);
1133 irq_put_desc_unlock(desc, flags);
1135 EXPORT_SYMBOL_GPL(irq_modify_status);
1137 #ifdef CONFIG_DEPRECATED_IRQ_CPU_ONOFFLINE
1139 * irq_cpu_online - Invoke all irq_cpu_online functions.
1141 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1144 void irq_cpu_online(void)
1146 struct irq_desc *desc;
1147 struct irq_chip *chip;
1148 unsigned long flags;
1151 for_each_active_irq(irq) {
1152 desc = irq_to_desc(irq);
1156 raw_spin_lock_irqsave(&desc->lock, flags);
1158 chip = irq_data_get_irq_chip(&desc->irq_data);
1159 if (chip && chip->irq_cpu_online &&
1160 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1161 !irqd_irq_disabled(&desc->irq_data)))
1162 chip->irq_cpu_online(&desc->irq_data);
1164 raw_spin_unlock_irqrestore(&desc->lock, flags);
1169 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1171 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1174 void irq_cpu_offline(void)
1176 struct irq_desc *desc;
1177 struct irq_chip *chip;
1178 unsigned long flags;
1181 for_each_active_irq(irq) {
1182 desc = irq_to_desc(irq);
1186 raw_spin_lock_irqsave(&desc->lock, flags);
1188 chip = irq_data_get_irq_chip(&desc->irq_data);
1189 if (chip && chip->irq_cpu_offline &&
1190 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1191 !irqd_irq_disabled(&desc->irq_data)))
1192 chip->irq_cpu_offline(&desc->irq_data);
1194 raw_spin_unlock_irqrestore(&desc->lock, flags);
1199 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1201 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1203 * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1204 * stacked on transparent controllers
1206 * @desc: the interrupt description structure for this irq
1208 * Like handle_fasteoi_irq(), but for use with hierarchy where
1209 * the irq_chip also needs to have its ->irq_ack() function
1212 void handle_fasteoi_ack_irq(struct irq_desc *desc)
1214 struct irq_chip *chip = desc->irq_data.chip;
1216 raw_spin_lock(&desc->lock);
1218 if (!irq_may_run(desc))
1221 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1224 * If its disabled or no action available
1225 * then mask it and get out of here:
1227 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1228 desc->istate |= IRQS_PENDING;
1233 kstat_incr_irqs_this_cpu(desc);
1234 if (desc->istate & IRQS_ONESHOT)
1237 /* Start handling the irq */
1238 desc->irq_data.chip->irq_ack(&desc->irq_data);
1240 handle_irq_event(desc);
1242 cond_unmask_eoi_irq(desc, chip);
1244 raw_spin_unlock(&desc->lock);
1247 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1248 chip->irq_eoi(&desc->irq_data);
1249 raw_spin_unlock(&desc->lock);
1251 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1254 * handle_fasteoi_mask_irq - irq handler for level hierarchy
1255 * stacked on transparent controllers
1257 * @desc: the interrupt description structure for this irq
1259 * Like handle_fasteoi_irq(), but for use with hierarchy where
1260 * the irq_chip also needs to have its ->irq_mask_ack() function
1263 void handle_fasteoi_mask_irq(struct irq_desc *desc)
1265 struct irq_chip *chip = desc->irq_data.chip;
1267 raw_spin_lock(&desc->lock);
1270 if (!irq_may_run(desc))
1273 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1276 * If its disabled or no action available
1277 * then mask it and get out of here:
1279 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1280 desc->istate |= IRQS_PENDING;
1285 kstat_incr_irqs_this_cpu(desc);
1286 if (desc->istate & IRQS_ONESHOT)
1289 handle_irq_event(desc);
1291 cond_unmask_eoi_irq(desc, chip);
1293 raw_spin_unlock(&desc->lock);
1296 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1297 chip->irq_eoi(&desc->irq_data);
1298 raw_spin_unlock(&desc->lock);
1300 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1302 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1305 * irq_chip_set_parent_state - set the state of a parent interrupt.
1307 * @data: Pointer to interrupt specific data
1308 * @which: State to be restored (one of IRQCHIP_STATE_*)
1309 * @val: Value corresponding to @which
1311 * Conditional success, if the underlying irqchip does not implement it.
1313 int irq_chip_set_parent_state(struct irq_data *data,
1314 enum irqchip_irq_state which,
1317 data = data->parent_data;
1319 if (!data || !data->chip->irq_set_irqchip_state)
1322 return data->chip->irq_set_irqchip_state(data, which, val);
1324 EXPORT_SYMBOL_GPL(irq_chip_set_parent_state);
1327 * irq_chip_get_parent_state - get the state of a parent interrupt.
1329 * @data: Pointer to interrupt specific data
1330 * @which: one of IRQCHIP_STATE_* the caller wants to know
1331 * @state: a pointer to a boolean where the state is to be stored
1333 * Conditional success, if the underlying irqchip does not implement it.
1335 int irq_chip_get_parent_state(struct irq_data *data,
1336 enum irqchip_irq_state which,
1339 data = data->parent_data;
1341 if (!data || !data->chip->irq_get_irqchip_state)
1344 return data->chip->irq_get_irqchip_state(data, which, state);
1346 EXPORT_SYMBOL_GPL(irq_chip_get_parent_state);
1349 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1351 * @data: Pointer to interrupt specific data
1353 void irq_chip_enable_parent(struct irq_data *data)
1355 data = data->parent_data;
1356 if (data->chip->irq_enable)
1357 data->chip->irq_enable(data);
1359 data->chip->irq_unmask(data);
1361 EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1364 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1366 * @data: Pointer to interrupt specific data
1368 void irq_chip_disable_parent(struct irq_data *data)
1370 data = data->parent_data;
1371 if (data->chip->irq_disable)
1372 data->chip->irq_disable(data);
1374 data->chip->irq_mask(data);
1376 EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1379 * irq_chip_ack_parent - Acknowledge the parent interrupt
1380 * @data: Pointer to interrupt specific data
1382 void irq_chip_ack_parent(struct irq_data *data)
1384 data = data->parent_data;
1385 data->chip->irq_ack(data);
1387 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1390 * irq_chip_mask_parent - Mask the parent interrupt
1391 * @data: Pointer to interrupt specific data
1393 void irq_chip_mask_parent(struct irq_data *data)
1395 data = data->parent_data;
1396 data->chip->irq_mask(data);
1398 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1401 * irq_chip_mask_ack_parent - Mask and acknowledge the parent interrupt
1402 * @data: Pointer to interrupt specific data
1404 void irq_chip_mask_ack_parent(struct irq_data *data)
1406 data = data->parent_data;
1407 data->chip->irq_mask_ack(data);
1409 EXPORT_SYMBOL_GPL(irq_chip_mask_ack_parent);
1412 * irq_chip_unmask_parent - Unmask the parent interrupt
1413 * @data: Pointer to interrupt specific data
1415 void irq_chip_unmask_parent(struct irq_data *data)
1417 data = data->parent_data;
1418 data->chip->irq_unmask(data);
1420 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1423 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1424 * @data: Pointer to interrupt specific data
1426 void irq_chip_eoi_parent(struct irq_data *data)
1428 data = data->parent_data;
1429 data->chip->irq_eoi(data);
1431 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1434 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1435 * @data: Pointer to interrupt specific data
1436 * @dest: The affinity mask to set
1437 * @force: Flag to enforce setting (disable online checks)
1439 * Conditional, as the underlying parent chip might not implement it.
1441 int irq_chip_set_affinity_parent(struct irq_data *data,
1442 const struct cpumask *dest, bool force)
1444 data = data->parent_data;
1445 if (data->chip->irq_set_affinity)
1446 return data->chip->irq_set_affinity(data, dest, force);
1450 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1453 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1454 * @data: Pointer to interrupt specific data
1455 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1457 * Conditional, as the underlying parent chip might not implement it.
1459 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1461 data = data->parent_data;
1463 if (data->chip->irq_set_type)
1464 return data->chip->irq_set_type(data, type);
1468 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1471 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1472 * @data: Pointer to interrupt specific data
1474 * Iterate through the domain hierarchy of the interrupt and check
1475 * whether a hw retrigger function exists. If yes, invoke it.
1477 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1479 for (data = data->parent_data; data; data = data->parent_data)
1480 if (data->chip && data->chip->irq_retrigger)
1481 return data->chip->irq_retrigger(data);
1485 EXPORT_SYMBOL_GPL(irq_chip_retrigger_hierarchy);
1488 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1489 * @data: Pointer to interrupt specific data
1490 * @vcpu_info: The vcpu affinity information
1492 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1494 data = data->parent_data;
1495 if (data->chip->irq_set_vcpu_affinity)
1496 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1500 EXPORT_SYMBOL_GPL(irq_chip_set_vcpu_affinity_parent);
1502 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1503 * @data: Pointer to interrupt specific data
1504 * @on: Whether to set or reset the wake-up capability of this irq
1506 * Conditional, as the underlying parent chip might not implement it.
1508 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1510 data = data->parent_data;
1512 if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1515 if (data->chip->irq_set_wake)
1516 return data->chip->irq_set_wake(data, on);
1520 EXPORT_SYMBOL_GPL(irq_chip_set_wake_parent);
1523 * irq_chip_request_resources_parent - Request resources on the parent interrupt
1524 * @data: Pointer to interrupt specific data
1526 int irq_chip_request_resources_parent(struct irq_data *data)
1528 data = data->parent_data;
1530 if (data->chip->irq_request_resources)
1531 return data->chip->irq_request_resources(data);
1533 /* no error on missing optional irq_chip::irq_request_resources */
1536 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);
1539 * irq_chip_release_resources_parent - Release resources on the parent interrupt
1540 * @data: Pointer to interrupt specific data
1542 void irq_chip_release_resources_parent(struct irq_data *data)
1544 data = data->parent_data;
1545 if (data->chip->irq_release_resources)
1546 data->chip->irq_release_resources(data);
1548 EXPORT_SYMBOL_GPL(irq_chip_release_resources_parent);
1552 * irq_chip_compose_msi_msg - Compose msi message for a irq chip
1553 * @data: Pointer to interrupt specific data
1554 * @msg: Pointer to the MSI message
1556 * For hierarchical domains we find the first chip in the hierarchy
1557 * which implements the irq_compose_msi_msg callback. For non
1558 * hierarchical we use the top level chip.
1560 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1562 struct irq_data *pos;
1564 for (pos = NULL; !pos && data; data = irqd_get_parent_data(data)) {
1565 if (data->chip && data->chip->irq_compose_msi_msg)
1572 pos->chip->irq_compose_msi_msg(pos, msg);
1576 static struct device *irq_get_pm_device(struct irq_data *data)
1579 return data->domain->pm_dev;
1585 * irq_chip_pm_get - Enable power for an IRQ chip
1586 * @data: Pointer to interrupt specific data
1588 * Enable the power to the IRQ chip referenced by the interrupt data
1591 int irq_chip_pm_get(struct irq_data *data)
1593 struct device *dev = irq_get_pm_device(data);
1596 if (IS_ENABLED(CONFIG_PM) && dev)
1597 retval = pm_runtime_resume_and_get(dev);
1603 * irq_chip_pm_put - Disable power for an IRQ chip
1604 * @data: Pointer to interrupt specific data
1606 * Disable the power to the IRQ chip referenced by the interrupt data
1607 * structure, belongs. Note that power will only be disabled, once this
1608 * function has been called for all IRQs that have called irq_chip_pm_get().
1610 int irq_chip_pm_put(struct irq_data *data)
1612 struct device *dev = irq_get_pm_device(data);
1615 if (IS_ENABLED(CONFIG_PM) && dev)
1616 retval = pm_runtime_put(dev);
1618 return (retval < 0) ? retval : 0;