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, struct irq_chip *chip)
44 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
52 desc->irq_data.chip = chip;
53 irq_put_desc_unlock(desc, flags);
55 * For !CONFIG_SPARSE_IRQ make the irq show up in
61 EXPORT_SYMBOL(irq_set_chip);
64 * irq_set_irq_type - set the irq trigger type for an irq
66 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
68 int irq_set_irq_type(unsigned int irq, unsigned int type)
71 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
77 ret = __irq_set_trigger(desc, type);
78 irq_put_desc_busunlock(desc, flags);
81 EXPORT_SYMBOL(irq_set_irq_type);
84 * irq_set_handler_data - set irq handler data for an irq
85 * @irq: Interrupt number
86 * @data: Pointer to interrupt specific data
88 * Set the hardware irq controller data for an irq
90 int irq_set_handler_data(unsigned int irq, void *data)
93 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
97 desc->irq_common_data.handler_data = data;
98 irq_put_desc_unlock(desc, flags);
101 EXPORT_SYMBOL(irq_set_handler_data);
104 * irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
105 * @irq_base: Interrupt number base
106 * @irq_offset: Interrupt number offset
107 * @entry: Pointer to MSI descriptor data
109 * Set the MSI descriptor entry for an irq at offset
111 int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
112 struct msi_desc *entry)
115 struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
119 desc->irq_common_data.msi_desc = entry;
120 if (entry && !irq_offset)
121 entry->irq = irq_base;
122 irq_put_desc_unlock(desc, flags);
127 * irq_set_msi_desc - set MSI descriptor data for an irq
128 * @irq: Interrupt number
129 * @entry: Pointer to MSI descriptor data
131 * Set the MSI descriptor entry for an irq
133 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
135 return irq_set_msi_desc_off(irq, 0, entry);
139 * irq_set_chip_data - set irq chip data for an irq
140 * @irq: Interrupt number
141 * @data: Pointer to chip specific data
143 * Set the hardware irq chip data for an irq
145 int irq_set_chip_data(unsigned int irq, void *data)
148 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
152 desc->irq_data.chip_data = data;
153 irq_put_desc_unlock(desc, flags);
156 EXPORT_SYMBOL(irq_set_chip_data);
158 struct irq_data *irq_get_irq_data(unsigned int irq)
160 struct irq_desc *desc = irq_to_desc(irq);
162 return desc ? &desc->irq_data : NULL;
164 EXPORT_SYMBOL_GPL(irq_get_irq_data);
166 static void irq_state_clr_disabled(struct irq_desc *desc)
168 irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
171 static void irq_state_clr_masked(struct irq_desc *desc)
173 irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
176 static void irq_state_clr_started(struct irq_desc *desc)
178 irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED);
181 static void irq_state_set_started(struct irq_desc *desc)
183 irqd_set(&desc->irq_data, IRQD_IRQ_STARTED);
194 __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
196 struct irq_data *d = irq_desc_get_irq_data(desc);
198 if (!irqd_affinity_is_managed(d))
199 return IRQ_STARTUP_NORMAL;
201 irqd_clr_managed_shutdown(d);
203 if (cpumask_any_and(aff, cpu_online_mask) >= nr_cpu_ids) {
205 * Catch code which fiddles with enable_irq() on a managed
206 * and potentially shutdown IRQ. Chained interrupt
207 * installment or irq auto probing should not happen on
208 * managed irqs either.
210 if (WARN_ON_ONCE(force))
211 return IRQ_STARTUP_ABORT;
213 * The interrupt was requested, but there is no online CPU
214 * in it's affinity mask. Put it into managed shutdown
215 * state and let the cpu hotplug mechanism start it up once
216 * a CPU in the mask becomes available.
218 return IRQ_STARTUP_ABORT;
221 * Managed interrupts have reserved resources, so this should not
224 if (WARN_ON(irq_domain_activate_irq(d, false)))
225 return IRQ_STARTUP_ABORT;
226 return IRQ_STARTUP_MANAGED;
229 static __always_inline int
230 __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
232 return IRQ_STARTUP_NORMAL;
236 static int __irq_startup(struct irq_desc *desc)
238 struct irq_data *d = irq_desc_get_irq_data(desc);
241 /* Warn if this interrupt is not activated but try nevertheless */
242 WARN_ON_ONCE(!irqd_is_activated(d));
244 if (d->chip->irq_startup) {
245 ret = d->chip->irq_startup(d);
246 irq_state_clr_disabled(desc);
247 irq_state_clr_masked(desc);
251 irq_state_set_started(desc);
255 int irq_startup(struct irq_desc *desc, bool resend, bool force)
257 struct irq_data *d = irq_desc_get_irq_data(desc);
258 struct cpumask *aff = irq_data_get_affinity_mask(d);
263 if (irqd_is_started(d)) {
266 switch (__irq_startup_managed(desc, aff, force)) {
267 case IRQ_STARTUP_NORMAL:
268 if (d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP)
269 irq_setup_affinity(desc);
270 ret = __irq_startup(desc);
271 if (!(d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP))
272 irq_setup_affinity(desc);
274 case IRQ_STARTUP_MANAGED:
275 irq_do_set_affinity(d, aff, false);
276 ret = __irq_startup(desc);
278 case IRQ_STARTUP_ABORT:
279 irqd_set_managed_shutdown(d);
284 check_irq_resend(desc, false);
289 int irq_activate(struct irq_desc *desc)
291 struct irq_data *d = irq_desc_get_irq_data(desc);
293 if (!irqd_affinity_is_managed(d))
294 return irq_domain_activate_irq(d, false);
298 int irq_activate_and_startup(struct irq_desc *desc, bool resend)
300 if (WARN_ON(irq_activate(desc)))
302 return irq_startup(desc, resend, IRQ_START_FORCE);
305 static void __irq_disable(struct irq_desc *desc, bool mask);
307 void irq_shutdown(struct irq_desc *desc)
309 if (irqd_is_started(&desc->irq_data)) {
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 unsigned int flags = 0;
580 raw_spin_lock(&desc->lock);
582 if (!irq_may_run(desc))
585 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
587 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
588 desc->istate |= IRQS_PENDING;
592 desc->istate &= ~IRQS_PENDING;
593 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
594 raw_spin_unlock(&desc->lock);
596 __handle_irq_event_percpu(desc, &flags);
598 raw_spin_lock(&desc->lock);
599 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
602 raw_spin_unlock(&desc->lock);
604 EXPORT_SYMBOL_GPL(handle_untracked_irq);
607 * Called unconditionally from handle_level_irq() and only for oneshot
608 * interrupts from handle_fasteoi_irq()
610 static void cond_unmask_irq(struct irq_desc *desc)
613 * We need to unmask in the following cases:
614 * - Standard level irq (IRQF_ONESHOT is not set)
615 * - Oneshot irq which did not wake the thread (caused by a
616 * spurious interrupt or a primary handler handling it
619 if (!irqd_irq_disabled(&desc->irq_data) &&
620 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
625 * handle_level_irq - Level type irq handler
626 * @desc: the interrupt description structure for this irq
628 * Level type interrupts are active as long as the hardware line has
629 * the active level. This may require to mask the interrupt and unmask
630 * it after the associated handler has acknowledged the device, so the
631 * interrupt line is back to inactive.
633 void handle_level_irq(struct irq_desc *desc)
635 raw_spin_lock(&desc->lock);
638 if (!irq_may_run(desc))
641 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
644 * If its disabled or no action available
645 * keep it masked and get out of here
647 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
648 desc->istate |= IRQS_PENDING;
652 kstat_incr_irqs_this_cpu(desc);
653 handle_irq_event(desc);
655 cond_unmask_irq(desc);
658 raw_spin_unlock(&desc->lock);
660 EXPORT_SYMBOL_GPL(handle_level_irq);
662 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
664 if (!(desc->istate & IRQS_ONESHOT)) {
665 chip->irq_eoi(&desc->irq_data);
669 * We need to unmask in the following cases:
670 * - Oneshot irq which did not wake the thread (caused by a
671 * spurious interrupt or a primary handler handling it
674 if (!irqd_irq_disabled(&desc->irq_data) &&
675 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
676 chip->irq_eoi(&desc->irq_data);
678 } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
679 chip->irq_eoi(&desc->irq_data);
684 * handle_fasteoi_irq - irq handler for transparent controllers
685 * @desc: the interrupt description structure for this irq
687 * Only a single callback will be issued to the chip: an ->eoi()
688 * call when the interrupt has been serviced. This enables support
689 * for modern forms of interrupt handlers, which handle the flow
690 * details in hardware, transparently.
692 void handle_fasteoi_irq(struct irq_desc *desc)
694 struct irq_chip *chip = desc->irq_data.chip;
696 raw_spin_lock(&desc->lock);
698 if (!irq_may_run(desc))
701 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
704 * If its disabled or no action available
705 * then mask it and get out of here:
707 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
708 desc->istate |= IRQS_PENDING;
713 kstat_incr_irqs_this_cpu(desc);
714 if (desc->istate & IRQS_ONESHOT)
717 handle_irq_event(desc);
719 cond_unmask_eoi_irq(desc, chip);
721 raw_spin_unlock(&desc->lock);
724 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
725 chip->irq_eoi(&desc->irq_data);
726 raw_spin_unlock(&desc->lock);
728 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
731 * handle_fasteoi_nmi - irq handler for NMI interrupt lines
732 * @desc: the interrupt description structure for this irq
734 * A simple NMI-safe handler, considering the restrictions
737 * Only a single callback will be issued to the chip: an ->eoi()
738 * call when the interrupt has been serviced. This enables support
739 * for modern forms of interrupt handlers, which handle the flow
740 * details in hardware, transparently.
742 void handle_fasteoi_nmi(struct irq_desc *desc)
744 struct irq_chip *chip = irq_desc_get_chip(desc);
745 struct irqaction *action = desc->action;
746 unsigned int irq = irq_desc_get_irq(desc);
749 __kstat_incr_irqs_this_cpu(desc);
751 trace_irq_handler_entry(irq, action);
753 * NMIs cannot be shared, there is only one action.
755 res = action->handler(irq, action->dev_id);
756 trace_irq_handler_exit(irq, action, res);
759 chip->irq_eoi(&desc->irq_data);
761 EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);
764 * handle_edge_irq - edge type IRQ handler
765 * @desc: the interrupt description structure for this irq
767 * Interrupt occurs on the falling and/or rising edge of a hardware
768 * signal. The occurrence is latched into the irq controller hardware
769 * and must be acked in order to be reenabled. After the ack another
770 * interrupt can happen on the same source even before the first one
771 * is handled by the associated event handler. If this happens it
772 * might be necessary to disable (mask) the interrupt depending on the
773 * controller hardware. This requires to reenable the interrupt inside
774 * of the loop which handles the interrupts which have arrived while
775 * the handler was running. If all pending interrupts are handled, the
778 void handle_edge_irq(struct irq_desc *desc)
780 raw_spin_lock(&desc->lock);
782 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
784 if (!irq_may_run(desc)) {
785 desc->istate |= IRQS_PENDING;
791 * If its disabled or no action available then mask it and get
794 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
795 desc->istate |= IRQS_PENDING;
800 kstat_incr_irqs_this_cpu(desc);
802 /* Start handling the irq */
803 desc->irq_data.chip->irq_ack(&desc->irq_data);
806 if (unlikely(!desc->action)) {
812 * When another irq arrived while we were handling
813 * one, we could have masked the irq.
814 * Reenable it, if it was not disabled in meantime.
816 if (unlikely(desc->istate & IRQS_PENDING)) {
817 if (!irqd_irq_disabled(&desc->irq_data) &&
818 irqd_irq_masked(&desc->irq_data))
822 handle_irq_event(desc);
824 } while ((desc->istate & IRQS_PENDING) &&
825 !irqd_irq_disabled(&desc->irq_data));
828 raw_spin_unlock(&desc->lock);
830 EXPORT_SYMBOL(handle_edge_irq);
832 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
834 * handle_edge_eoi_irq - edge eoi type IRQ handler
835 * @desc: the interrupt description structure for this irq
837 * Similar as the above handle_edge_irq, but using eoi and w/o the
840 void handle_edge_eoi_irq(struct irq_desc *desc)
842 struct irq_chip *chip = irq_desc_get_chip(desc);
844 raw_spin_lock(&desc->lock);
846 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
848 if (!irq_may_run(desc)) {
849 desc->istate |= IRQS_PENDING;
854 * If its disabled or no action available then mask it and get
857 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
858 desc->istate |= IRQS_PENDING;
862 kstat_incr_irqs_this_cpu(desc);
865 if (unlikely(!desc->action))
868 handle_irq_event(desc);
870 } while ((desc->istate & IRQS_PENDING) &&
871 !irqd_irq_disabled(&desc->irq_data));
874 chip->irq_eoi(&desc->irq_data);
875 raw_spin_unlock(&desc->lock);
880 * handle_percpu_irq - Per CPU local irq handler
881 * @desc: the interrupt description structure for this irq
883 * Per CPU interrupts on SMP machines without locking requirements
885 void handle_percpu_irq(struct irq_desc *desc)
887 struct irq_chip *chip = irq_desc_get_chip(desc);
890 * PER CPU interrupts are not serialized. Do not touch
893 __kstat_incr_irqs_this_cpu(desc);
896 chip->irq_ack(&desc->irq_data);
898 handle_irq_event_percpu(desc);
901 chip->irq_eoi(&desc->irq_data);
905 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
906 * @desc: the interrupt description structure for this irq
908 * Per CPU interrupts on SMP machines without locking requirements. Same as
909 * handle_percpu_irq() above but with the following extras:
911 * action->percpu_dev_id is a pointer to percpu variables which
912 * contain the real device id for the cpu on which this handler is
915 void handle_percpu_devid_irq(struct irq_desc *desc)
917 struct irq_chip *chip = irq_desc_get_chip(desc);
918 struct irqaction *action = desc->action;
919 unsigned int irq = irq_desc_get_irq(desc);
923 * PER CPU interrupts are not serialized. Do not touch
926 __kstat_incr_irqs_this_cpu(desc);
929 chip->irq_ack(&desc->irq_data);
931 if (likely(action)) {
932 trace_irq_handler_entry(irq, action);
933 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
934 trace_irq_handler_exit(irq, action, res);
936 unsigned int cpu = smp_processor_id();
937 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
940 irq_percpu_disable(desc, cpu);
942 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
943 enabled ? " and unmasked" : "", irq, cpu);
947 chip->irq_eoi(&desc->irq_data);
951 * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
953 * @desc: the interrupt description structure for this irq
955 * Similar to handle_fasteoi_nmi, but handling the dev_id cookie
956 * as a percpu pointer.
958 void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
960 struct irq_chip *chip = irq_desc_get_chip(desc);
961 struct irqaction *action = desc->action;
962 unsigned int irq = irq_desc_get_irq(desc);
965 __kstat_incr_irqs_this_cpu(desc);
967 trace_irq_handler_entry(irq, action);
968 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
969 trace_irq_handler_exit(irq, action, res);
972 chip->irq_eoi(&desc->irq_data);
976 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
977 int is_chained, const char *name)
980 handle = handle_bad_irq;
982 struct irq_data *irq_data = &desc->irq_data;
983 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
985 * With hierarchical domains we might run into a
986 * situation where the outermost chip is not yet set
987 * up, but the inner chips are there. Instead of
988 * bailing we install the handler, but obviously we
989 * cannot enable/startup the interrupt at this point.
992 if (irq_data->chip != &no_irq_chip)
995 * Bail out if the outer chip is not set up
996 * and the interrupt supposed to be started
999 if (WARN_ON(is_chained))
1001 /* Try the parent */
1002 irq_data = irq_data->parent_data;
1005 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
1010 if (handle == handle_bad_irq) {
1011 if (desc->irq_data.chip != &no_irq_chip)
1013 irq_state_set_disabled(desc);
1015 desc->action = NULL;
1018 desc->handle_irq = handle;
1021 if (handle != handle_bad_irq && is_chained) {
1022 unsigned int type = irqd_get_trigger_type(&desc->irq_data);
1025 * We're about to start this interrupt immediately,
1026 * hence the need to set the trigger configuration.
1027 * But the .set_type callback may have overridden the
1028 * flow handler, ignoring that we're dealing with a
1029 * chained interrupt. Reset it immediately because we
1032 if (type != IRQ_TYPE_NONE) {
1033 __irq_set_trigger(desc, type);
1034 desc->handle_irq = handle;
1037 irq_settings_set_noprobe(desc);
1038 irq_settings_set_norequest(desc);
1039 irq_settings_set_nothread(desc);
1040 desc->action = &chained_action;
1041 irq_activate_and_startup(desc, IRQ_RESEND);
1046 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1049 unsigned long flags;
1050 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1055 __irq_do_set_handler(desc, handle, is_chained, name);
1056 irq_put_desc_busunlock(desc, flags);
1058 EXPORT_SYMBOL_GPL(__irq_set_handler);
1061 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1064 unsigned long flags;
1065 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1070 desc->irq_common_data.handler_data = data;
1071 __irq_do_set_handler(desc, handle, 1, NULL);
1073 irq_put_desc_busunlock(desc, flags);
1075 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1078 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
1079 irq_flow_handler_t handle, const char *name)
1081 irq_set_chip(irq, chip);
1082 __irq_set_handler(irq, handle, 0, name);
1084 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1086 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1088 unsigned long flags, trigger, tmp;
1089 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1095 * Warn when a driver sets the no autoenable flag on an already
1098 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1100 irq_settings_clr_and_set(desc, clr, set);
1102 trigger = irqd_get_trigger_type(&desc->irq_data);
1104 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1105 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1106 if (irq_settings_has_no_balance_set(desc))
1107 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1108 if (irq_settings_is_per_cpu(desc))
1109 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1110 if (irq_settings_can_move_pcntxt(desc))
1111 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1112 if (irq_settings_is_level(desc))
1113 irqd_set(&desc->irq_data, IRQD_LEVEL);
1115 tmp = irq_settings_get_trigger_mask(desc);
1116 if (tmp != IRQ_TYPE_NONE)
1119 irqd_set(&desc->irq_data, trigger);
1121 irq_put_desc_unlock(desc, flags);
1123 EXPORT_SYMBOL_GPL(irq_modify_status);
1126 * irq_cpu_online - Invoke all irq_cpu_online functions.
1128 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1131 void irq_cpu_online(void)
1133 struct irq_desc *desc;
1134 struct irq_chip *chip;
1135 unsigned long flags;
1138 for_each_active_irq(irq) {
1139 desc = irq_to_desc(irq);
1143 raw_spin_lock_irqsave(&desc->lock, flags);
1145 chip = irq_data_get_irq_chip(&desc->irq_data);
1146 if (chip && chip->irq_cpu_online &&
1147 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1148 !irqd_irq_disabled(&desc->irq_data)))
1149 chip->irq_cpu_online(&desc->irq_data);
1151 raw_spin_unlock_irqrestore(&desc->lock, flags);
1156 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1158 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1161 void irq_cpu_offline(void)
1163 struct irq_desc *desc;
1164 struct irq_chip *chip;
1165 unsigned long flags;
1168 for_each_active_irq(irq) {
1169 desc = irq_to_desc(irq);
1173 raw_spin_lock_irqsave(&desc->lock, flags);
1175 chip = irq_data_get_irq_chip(&desc->irq_data);
1176 if (chip && chip->irq_cpu_offline &&
1177 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1178 !irqd_irq_disabled(&desc->irq_data)))
1179 chip->irq_cpu_offline(&desc->irq_data);
1181 raw_spin_unlock_irqrestore(&desc->lock, flags);
1185 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1187 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1189 * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1190 * stacked on transparent controllers
1192 * @desc: the interrupt description structure for this irq
1194 * Like handle_fasteoi_irq(), but for use with hierarchy where
1195 * the irq_chip also needs to have its ->irq_ack() function
1198 void handle_fasteoi_ack_irq(struct irq_desc *desc)
1200 struct irq_chip *chip = desc->irq_data.chip;
1202 raw_spin_lock(&desc->lock);
1204 if (!irq_may_run(desc))
1207 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1210 * If its disabled or no action available
1211 * then mask it and get out of here:
1213 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1214 desc->istate |= IRQS_PENDING;
1219 kstat_incr_irqs_this_cpu(desc);
1220 if (desc->istate & IRQS_ONESHOT)
1223 /* Start handling the irq */
1224 desc->irq_data.chip->irq_ack(&desc->irq_data);
1226 handle_irq_event(desc);
1228 cond_unmask_eoi_irq(desc, chip);
1230 raw_spin_unlock(&desc->lock);
1233 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1234 chip->irq_eoi(&desc->irq_data);
1235 raw_spin_unlock(&desc->lock);
1237 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1240 * handle_fasteoi_mask_irq - irq handler for level hierarchy
1241 * stacked on transparent controllers
1243 * @desc: the interrupt description structure for this irq
1245 * Like handle_fasteoi_irq(), but for use with hierarchy where
1246 * the irq_chip also needs to have its ->irq_mask_ack() function
1249 void handle_fasteoi_mask_irq(struct irq_desc *desc)
1251 struct irq_chip *chip = desc->irq_data.chip;
1253 raw_spin_lock(&desc->lock);
1256 if (!irq_may_run(desc))
1259 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1262 * If its disabled or no action available
1263 * then mask it and get out of here:
1265 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1266 desc->istate |= IRQS_PENDING;
1271 kstat_incr_irqs_this_cpu(desc);
1272 if (desc->istate & IRQS_ONESHOT)
1275 handle_irq_event(desc);
1277 cond_unmask_eoi_irq(desc, chip);
1279 raw_spin_unlock(&desc->lock);
1282 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1283 chip->irq_eoi(&desc->irq_data);
1284 raw_spin_unlock(&desc->lock);
1286 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1288 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1291 * irq_chip_set_parent_state - set the state of a parent interrupt.
1293 * @data: Pointer to interrupt specific data
1294 * @which: State to be restored (one of IRQCHIP_STATE_*)
1295 * @val: Value corresponding to @which
1297 * Conditional success, if the underlying irqchip does not implement it.
1299 int irq_chip_set_parent_state(struct irq_data *data,
1300 enum irqchip_irq_state which,
1303 data = data->parent_data;
1305 if (!data || !data->chip->irq_set_irqchip_state)
1308 return data->chip->irq_set_irqchip_state(data, which, val);
1310 EXPORT_SYMBOL_GPL(irq_chip_set_parent_state);
1313 * irq_chip_get_parent_state - get the state of a parent interrupt.
1315 * @data: Pointer to interrupt specific data
1316 * @which: one of IRQCHIP_STATE_* the caller wants to know
1317 * @state: a pointer to a boolean where the state is to be stored
1319 * Conditional success, if the underlying irqchip does not implement it.
1321 int irq_chip_get_parent_state(struct irq_data *data,
1322 enum irqchip_irq_state which,
1325 data = data->parent_data;
1327 if (!data || !data->chip->irq_get_irqchip_state)
1330 return data->chip->irq_get_irqchip_state(data, which, state);
1332 EXPORT_SYMBOL_GPL(irq_chip_get_parent_state);
1335 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1337 * @data: Pointer to interrupt specific data
1339 void irq_chip_enable_parent(struct irq_data *data)
1341 data = data->parent_data;
1342 if (data->chip->irq_enable)
1343 data->chip->irq_enable(data);
1345 data->chip->irq_unmask(data);
1347 EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1350 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1352 * @data: Pointer to interrupt specific data
1354 void irq_chip_disable_parent(struct irq_data *data)
1356 data = data->parent_data;
1357 if (data->chip->irq_disable)
1358 data->chip->irq_disable(data);
1360 data->chip->irq_mask(data);
1362 EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1365 * irq_chip_ack_parent - Acknowledge the parent interrupt
1366 * @data: Pointer to interrupt specific data
1368 void irq_chip_ack_parent(struct irq_data *data)
1370 data = data->parent_data;
1371 data->chip->irq_ack(data);
1373 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1376 * irq_chip_mask_parent - Mask the parent interrupt
1377 * @data: Pointer to interrupt specific data
1379 void irq_chip_mask_parent(struct irq_data *data)
1381 data = data->parent_data;
1382 data->chip->irq_mask(data);
1384 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1387 * irq_chip_mask_ack_parent - Mask and acknowledge the parent interrupt
1388 * @data: Pointer to interrupt specific data
1390 void irq_chip_mask_ack_parent(struct irq_data *data)
1392 data = data->parent_data;
1393 data->chip->irq_mask_ack(data);
1395 EXPORT_SYMBOL_GPL(irq_chip_mask_ack_parent);
1398 * irq_chip_unmask_parent - Unmask the parent interrupt
1399 * @data: Pointer to interrupt specific data
1401 void irq_chip_unmask_parent(struct irq_data *data)
1403 data = data->parent_data;
1404 data->chip->irq_unmask(data);
1406 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1409 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1410 * @data: Pointer to interrupt specific data
1412 void irq_chip_eoi_parent(struct irq_data *data)
1414 data = data->parent_data;
1415 data->chip->irq_eoi(data);
1417 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1420 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1421 * @data: Pointer to interrupt specific data
1422 * @dest: The affinity mask to set
1423 * @force: Flag to enforce setting (disable online checks)
1425 * Conditional, as the underlying parent chip might not implement it.
1427 int irq_chip_set_affinity_parent(struct irq_data *data,
1428 const struct cpumask *dest, bool force)
1430 data = data->parent_data;
1431 if (data->chip->irq_set_affinity)
1432 return data->chip->irq_set_affinity(data, dest, force);
1436 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1439 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1440 * @data: Pointer to interrupt specific data
1441 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1443 * Conditional, as the underlying parent chip might not implement it.
1445 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1447 data = data->parent_data;
1449 if (data->chip->irq_set_type)
1450 return data->chip->irq_set_type(data, type);
1454 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1457 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1458 * @data: Pointer to interrupt specific data
1460 * Iterate through the domain hierarchy of the interrupt and check
1461 * whether a hw retrigger function exists. If yes, invoke it.
1463 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1465 for (data = data->parent_data; data; data = data->parent_data)
1466 if (data->chip && data->chip->irq_retrigger)
1467 return data->chip->irq_retrigger(data);
1471 EXPORT_SYMBOL_GPL(irq_chip_retrigger_hierarchy);
1474 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1475 * @data: Pointer to interrupt specific data
1476 * @vcpu_info: The vcpu affinity information
1478 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1480 data = data->parent_data;
1481 if (data->chip->irq_set_vcpu_affinity)
1482 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1486 EXPORT_SYMBOL_GPL(irq_chip_set_vcpu_affinity_parent);
1488 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1489 * @data: Pointer to interrupt specific data
1490 * @on: Whether to set or reset the wake-up capability of this irq
1492 * Conditional, as the underlying parent chip might not implement it.
1494 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1496 data = data->parent_data;
1498 if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1501 if (data->chip->irq_set_wake)
1502 return data->chip->irq_set_wake(data, on);
1506 EXPORT_SYMBOL_GPL(irq_chip_set_wake_parent);
1509 * irq_chip_request_resources_parent - Request resources on the parent interrupt
1510 * @data: Pointer to interrupt specific data
1512 int irq_chip_request_resources_parent(struct irq_data *data)
1514 data = data->parent_data;
1516 if (data->chip->irq_request_resources)
1517 return data->chip->irq_request_resources(data);
1521 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);
1524 * irq_chip_release_resources_parent - Release resources on the parent interrupt
1525 * @data: Pointer to interrupt specific data
1527 void irq_chip_release_resources_parent(struct irq_data *data)
1529 data = data->parent_data;
1530 if (data->chip->irq_release_resources)
1531 data->chip->irq_release_resources(data);
1533 EXPORT_SYMBOL_GPL(irq_chip_release_resources_parent);
1537 * irq_chip_compose_msi_msg - Compose msi message for a irq chip
1538 * @data: Pointer to interrupt specific data
1539 * @msg: Pointer to the MSI message
1541 * For hierarchical domains we find the first chip in the hierarchy
1542 * which implements the irq_compose_msi_msg callback. For non
1543 * hierarchical we use the top level chip.
1545 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1547 struct irq_data *pos;
1549 for (pos = NULL; !pos && data; data = irqd_get_parent_data(data)) {
1550 if (data->chip && data->chip->irq_compose_msi_msg)
1557 pos->chip->irq_compose_msi_msg(pos, msg);
1562 * irq_chip_pm_get - Enable power for an IRQ chip
1563 * @data: Pointer to interrupt specific data
1565 * Enable the power to the IRQ chip referenced by the interrupt data
1568 int irq_chip_pm_get(struct irq_data *data)
1572 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
1573 retval = pm_runtime_get_sync(data->chip->parent_device);
1575 pm_runtime_put_noidle(data->chip->parent_device);
1584 * irq_chip_pm_put - Disable power for an IRQ chip
1585 * @data: Pointer to interrupt specific data
1587 * Disable the power to the IRQ chip referenced by the interrupt data
1588 * structure, belongs. Note that power will only be disabled, once this
1589 * function has been called for all IRQs that have called irq_chip_pm_get().
1591 int irq_chip_pm_put(struct irq_data *data)
1595 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
1596 retval = pm_runtime_put(data->chip->parent_device);
1598 return (retval < 0) ? retval : 0;