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_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 ret = __irq_startup(desc);
269 irq_setup_affinity(desc);
271 case IRQ_STARTUP_MANAGED:
272 irq_do_set_affinity(d, aff, false);
273 ret = __irq_startup(desc);
275 case IRQ_STARTUP_ABORT:
276 irqd_set_managed_shutdown(d);
281 check_irq_resend(desc);
286 int irq_activate(struct irq_desc *desc)
288 struct irq_data *d = irq_desc_get_irq_data(desc);
290 if (!irqd_affinity_is_managed(d))
291 return irq_domain_activate_irq(d, false);
295 int irq_activate_and_startup(struct irq_desc *desc, bool resend)
297 if (WARN_ON(irq_activate(desc)))
299 return irq_startup(desc, resend, IRQ_START_FORCE);
302 static void __irq_disable(struct irq_desc *desc, bool mask);
304 void irq_shutdown(struct irq_desc *desc)
306 if (irqd_is_started(&desc->irq_data)) {
308 if (desc->irq_data.chip->irq_shutdown) {
309 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
310 irq_state_set_disabled(desc);
311 irq_state_set_masked(desc);
313 __irq_disable(desc, true);
315 irq_state_clr_started(desc);
320 void irq_shutdown_and_deactivate(struct irq_desc *desc)
324 * This must be called even if the interrupt was never started up,
325 * because the activation can happen before the interrupt is
326 * available for request/startup. It has it's own state tracking so
327 * it's safe to call it unconditionally.
329 irq_domain_deactivate_irq(&desc->irq_data);
332 void irq_enable(struct irq_desc *desc)
334 if (!irqd_irq_disabled(&desc->irq_data)) {
337 irq_state_clr_disabled(desc);
338 if (desc->irq_data.chip->irq_enable) {
339 desc->irq_data.chip->irq_enable(&desc->irq_data);
340 irq_state_clr_masked(desc);
347 static void __irq_disable(struct irq_desc *desc, bool mask)
349 if (irqd_irq_disabled(&desc->irq_data)) {
353 irq_state_set_disabled(desc);
354 if (desc->irq_data.chip->irq_disable) {
355 desc->irq_data.chip->irq_disable(&desc->irq_data);
356 irq_state_set_masked(desc);
364 * irq_disable - Mark interrupt disabled
365 * @desc: irq descriptor which should be disabled
367 * If the chip does not implement the irq_disable callback, we
368 * use a lazy disable approach. That means we mark the interrupt
369 * disabled, but leave the hardware unmasked. That's an
370 * optimization because we avoid the hardware access for the
371 * common case where no interrupt happens after we marked it
372 * disabled. If an interrupt happens, then the interrupt flow
373 * handler masks the line at the hardware level and marks it
376 * If the interrupt chip does not implement the irq_disable callback,
377 * a driver can disable the lazy approach for a particular irq line by
378 * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
379 * be used for devices which cannot disable the interrupt at the
380 * device level under certain circumstances and have to use
381 * disable_irq[_nosync] instead.
383 void irq_disable(struct irq_desc *desc)
385 __irq_disable(desc, irq_settings_disable_unlazy(desc));
388 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
390 if (desc->irq_data.chip->irq_enable)
391 desc->irq_data.chip->irq_enable(&desc->irq_data);
393 desc->irq_data.chip->irq_unmask(&desc->irq_data);
394 cpumask_set_cpu(cpu, desc->percpu_enabled);
397 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
399 if (desc->irq_data.chip->irq_disable)
400 desc->irq_data.chip->irq_disable(&desc->irq_data);
402 desc->irq_data.chip->irq_mask(&desc->irq_data);
403 cpumask_clear_cpu(cpu, desc->percpu_enabled);
406 static inline void mask_ack_irq(struct irq_desc *desc)
408 if (desc->irq_data.chip->irq_mask_ack) {
409 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
410 irq_state_set_masked(desc);
413 if (desc->irq_data.chip->irq_ack)
414 desc->irq_data.chip->irq_ack(&desc->irq_data);
418 void mask_irq(struct irq_desc *desc)
420 if (irqd_irq_masked(&desc->irq_data))
423 if (desc->irq_data.chip->irq_mask) {
424 desc->irq_data.chip->irq_mask(&desc->irq_data);
425 irq_state_set_masked(desc);
429 void unmask_irq(struct irq_desc *desc)
431 if (!irqd_irq_masked(&desc->irq_data))
434 if (desc->irq_data.chip->irq_unmask) {
435 desc->irq_data.chip->irq_unmask(&desc->irq_data);
436 irq_state_clr_masked(desc);
440 void unmask_threaded_irq(struct irq_desc *desc)
442 struct irq_chip *chip = desc->irq_data.chip;
444 if (chip->flags & IRQCHIP_EOI_THREADED)
445 chip->irq_eoi(&desc->irq_data);
451 * handle_nested_irq - Handle a nested irq from a irq thread
452 * @irq: the interrupt number
454 * Handle interrupts which are nested into a threaded interrupt
455 * handler. The handler function is called inside the calling
458 void handle_nested_irq(unsigned int irq)
460 struct irq_desc *desc = irq_to_desc(irq);
461 struct irqaction *action;
462 irqreturn_t action_ret;
466 raw_spin_lock_irq(&desc->lock);
468 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
470 action = desc->action;
471 if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
472 desc->istate |= IRQS_PENDING;
476 kstat_incr_irqs_this_cpu(desc);
477 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
478 raw_spin_unlock_irq(&desc->lock);
480 action_ret = IRQ_NONE;
481 for_each_action_of_desc(desc, action)
482 action_ret |= action->thread_fn(action->irq, action->dev_id);
485 note_interrupt(desc, action_ret);
487 raw_spin_lock_irq(&desc->lock);
488 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
491 raw_spin_unlock_irq(&desc->lock);
493 EXPORT_SYMBOL_GPL(handle_nested_irq);
495 static bool irq_check_poll(struct irq_desc *desc)
497 if (!(desc->istate & IRQS_POLL_INPROGRESS))
499 return irq_wait_for_poll(desc);
502 static bool irq_may_run(struct irq_desc *desc)
504 unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
507 * If the interrupt is not in progress and is not an armed
508 * wakeup interrupt, proceed.
510 if (!irqd_has_set(&desc->irq_data, mask))
514 * If the interrupt is an armed wakeup source, mark it pending
515 * and suspended, disable it and notify the pm core about the
518 if (irq_pm_check_wakeup(desc))
522 * Handle a potential concurrent poll on a different core.
524 return irq_check_poll(desc);
528 * handle_simple_irq - Simple and software-decoded IRQs.
529 * @desc: the interrupt description structure for this irq
531 * Simple interrupts are either sent from a demultiplexing interrupt
532 * handler or come from hardware, where no interrupt hardware control
535 * Note: The caller is expected to handle the ack, clear, mask and
536 * unmask issues if necessary.
538 void handle_simple_irq(struct irq_desc *desc)
540 raw_spin_lock(&desc->lock);
542 if (!irq_may_run(desc))
545 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
547 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
548 desc->istate |= IRQS_PENDING;
552 kstat_incr_irqs_this_cpu(desc);
553 handle_irq_event(desc);
556 raw_spin_unlock(&desc->lock);
558 EXPORT_SYMBOL_GPL(handle_simple_irq);
561 * handle_untracked_irq - Simple and software-decoded IRQs.
562 * @desc: the interrupt description structure for this irq
564 * Untracked interrupts are sent from a demultiplexing interrupt
565 * handler when the demultiplexer does not know which device it its
566 * multiplexed irq domain generated the interrupt. IRQ's handled
567 * through here are not subjected to stats tracking, randomness, or
568 * spurious interrupt detection.
570 * Note: Like handle_simple_irq, the caller is expected to handle
571 * the ack, clear, mask and unmask issues if necessary.
573 void handle_untracked_irq(struct irq_desc *desc)
575 unsigned int flags = 0;
577 raw_spin_lock(&desc->lock);
579 if (!irq_may_run(desc))
582 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
584 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
585 desc->istate |= IRQS_PENDING;
589 desc->istate &= ~IRQS_PENDING;
590 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
591 raw_spin_unlock(&desc->lock);
593 __handle_irq_event_percpu(desc, &flags);
595 raw_spin_lock(&desc->lock);
596 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
599 raw_spin_unlock(&desc->lock);
601 EXPORT_SYMBOL_GPL(handle_untracked_irq);
604 * Called unconditionally from handle_level_irq() and only for oneshot
605 * interrupts from handle_fasteoi_irq()
607 static void cond_unmask_irq(struct irq_desc *desc)
610 * We need to unmask in the following cases:
611 * - Standard level irq (IRQF_ONESHOT is not set)
612 * - Oneshot irq which did not wake the thread (caused by a
613 * spurious interrupt or a primary handler handling it
616 if (!irqd_irq_disabled(&desc->irq_data) &&
617 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
622 * handle_level_irq - Level type irq handler
623 * @desc: the interrupt description structure for this irq
625 * Level type interrupts are active as long as the hardware line has
626 * the active level. This may require to mask the interrupt and unmask
627 * it after the associated handler has acknowledged the device, so the
628 * interrupt line is back to inactive.
630 void handle_level_irq(struct irq_desc *desc)
632 raw_spin_lock(&desc->lock);
635 if (!irq_may_run(desc))
638 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
641 * If its disabled or no action available
642 * keep it masked and get out of here
644 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
645 desc->istate |= IRQS_PENDING;
649 kstat_incr_irqs_this_cpu(desc);
650 handle_irq_event(desc);
652 cond_unmask_irq(desc);
655 raw_spin_unlock(&desc->lock);
657 EXPORT_SYMBOL_GPL(handle_level_irq);
659 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
660 static inline void preflow_handler(struct irq_desc *desc)
662 if (desc->preflow_handler)
663 desc->preflow_handler(&desc->irq_data);
666 static inline void preflow_handler(struct irq_desc *desc) { }
669 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
671 if (!(desc->istate & IRQS_ONESHOT)) {
672 chip->irq_eoi(&desc->irq_data);
676 * We need to unmask in the following cases:
677 * - Oneshot irq which did not wake the thread (caused by a
678 * spurious interrupt or a primary handler handling it
681 if (!irqd_irq_disabled(&desc->irq_data) &&
682 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
683 chip->irq_eoi(&desc->irq_data);
685 } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
686 chip->irq_eoi(&desc->irq_data);
691 * handle_fasteoi_irq - irq handler for transparent controllers
692 * @desc: the interrupt description structure for this irq
694 * Only a single callback will be issued to the chip: an ->eoi()
695 * call when the interrupt has been serviced. This enables support
696 * for modern forms of interrupt handlers, which handle the flow
697 * details in hardware, transparently.
699 void handle_fasteoi_irq(struct irq_desc *desc)
701 struct irq_chip *chip = desc->irq_data.chip;
703 raw_spin_lock(&desc->lock);
705 if (!irq_may_run(desc))
708 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
711 * If its disabled or no action available
712 * then mask it and get out of here:
714 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
715 desc->istate |= IRQS_PENDING;
720 kstat_incr_irqs_this_cpu(desc);
721 if (desc->istate & IRQS_ONESHOT)
724 preflow_handler(desc);
725 handle_irq_event(desc);
727 cond_unmask_eoi_irq(desc, chip);
729 raw_spin_unlock(&desc->lock);
732 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
733 chip->irq_eoi(&desc->irq_data);
734 raw_spin_unlock(&desc->lock);
736 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
739 * handle_fasteoi_nmi - irq handler for NMI interrupt lines
740 * @desc: the interrupt description structure for this irq
742 * A simple NMI-safe handler, considering the restrictions
745 * Only a single callback will be issued to the chip: an ->eoi()
746 * call when the interrupt has been serviced. This enables support
747 * for modern forms of interrupt handlers, which handle the flow
748 * details in hardware, transparently.
750 void handle_fasteoi_nmi(struct irq_desc *desc)
752 struct irq_chip *chip = irq_desc_get_chip(desc);
753 struct irqaction *action = desc->action;
754 unsigned int irq = irq_desc_get_irq(desc);
757 __kstat_incr_irqs_this_cpu(desc);
759 trace_irq_handler_entry(irq, action);
761 * NMIs cannot be shared, there is only one action.
763 res = action->handler(irq, action->dev_id);
764 trace_irq_handler_exit(irq, action, res);
767 chip->irq_eoi(&desc->irq_data);
769 EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);
772 * handle_edge_irq - edge type IRQ handler
773 * @desc: the interrupt description structure for this irq
775 * Interrupt occures on the falling and/or rising edge of a hardware
776 * signal. The occurrence is latched into the irq controller hardware
777 * and must be acked in order to be reenabled. After the ack another
778 * interrupt can happen on the same source even before the first one
779 * is handled by the associated event handler. If this happens it
780 * might be necessary to disable (mask) the interrupt depending on the
781 * controller hardware. This requires to reenable the interrupt inside
782 * of the loop which handles the interrupts which have arrived while
783 * the handler was running. If all pending interrupts are handled, the
786 void handle_edge_irq(struct irq_desc *desc)
788 raw_spin_lock(&desc->lock);
790 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
792 if (!irq_may_run(desc)) {
793 desc->istate |= IRQS_PENDING;
799 * If its disabled or no action available then mask it and get
802 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
803 desc->istate |= IRQS_PENDING;
808 kstat_incr_irqs_this_cpu(desc);
810 /* Start handling the irq */
811 desc->irq_data.chip->irq_ack(&desc->irq_data);
814 if (unlikely(!desc->action)) {
820 * When another irq arrived while we were handling
821 * one, we could have masked the irq.
822 * Renable it, if it was not disabled in meantime.
824 if (unlikely(desc->istate & IRQS_PENDING)) {
825 if (!irqd_irq_disabled(&desc->irq_data) &&
826 irqd_irq_masked(&desc->irq_data))
830 handle_irq_event(desc);
832 } while ((desc->istate & IRQS_PENDING) &&
833 !irqd_irq_disabled(&desc->irq_data));
836 raw_spin_unlock(&desc->lock);
838 EXPORT_SYMBOL(handle_edge_irq);
840 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
842 * handle_edge_eoi_irq - edge eoi type IRQ handler
843 * @desc: the interrupt description structure for this irq
845 * Similar as the above handle_edge_irq, but using eoi and w/o the
848 void handle_edge_eoi_irq(struct irq_desc *desc)
850 struct irq_chip *chip = irq_desc_get_chip(desc);
852 raw_spin_lock(&desc->lock);
854 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
856 if (!irq_may_run(desc)) {
857 desc->istate |= IRQS_PENDING;
862 * If its disabled or no action available then mask it and get
865 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
866 desc->istate |= IRQS_PENDING;
870 kstat_incr_irqs_this_cpu(desc);
873 if (unlikely(!desc->action))
876 handle_irq_event(desc);
878 } while ((desc->istate & IRQS_PENDING) &&
879 !irqd_irq_disabled(&desc->irq_data));
882 chip->irq_eoi(&desc->irq_data);
883 raw_spin_unlock(&desc->lock);
888 * handle_percpu_irq - Per CPU local irq handler
889 * @desc: the interrupt description structure for this irq
891 * Per CPU interrupts on SMP machines without locking requirements
893 void handle_percpu_irq(struct irq_desc *desc)
895 struct irq_chip *chip = irq_desc_get_chip(desc);
898 * PER CPU interrupts are not serialized. Do not touch
901 __kstat_incr_irqs_this_cpu(desc);
904 chip->irq_ack(&desc->irq_data);
906 handle_irq_event_percpu(desc);
909 chip->irq_eoi(&desc->irq_data);
913 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
914 * @desc: the interrupt description structure for this irq
916 * Per CPU interrupts on SMP machines without locking requirements. Same as
917 * handle_percpu_irq() above but with the following extras:
919 * action->percpu_dev_id is a pointer to percpu variables which
920 * contain the real device id for the cpu on which this handler is
923 void handle_percpu_devid_irq(struct irq_desc *desc)
925 struct irq_chip *chip = irq_desc_get_chip(desc);
926 struct irqaction *action = desc->action;
927 unsigned int irq = irq_desc_get_irq(desc);
931 * PER CPU interrupts are not serialized. Do not touch
934 __kstat_incr_irqs_this_cpu(desc);
937 chip->irq_ack(&desc->irq_data);
939 if (likely(action)) {
940 trace_irq_handler_entry(irq, action);
941 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
942 trace_irq_handler_exit(irq, action, res);
944 unsigned int cpu = smp_processor_id();
945 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
948 irq_percpu_disable(desc, cpu);
950 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
951 enabled ? " and unmasked" : "", irq, cpu);
955 chip->irq_eoi(&desc->irq_data);
959 * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
961 * @desc: the interrupt description structure for this irq
963 * Similar to handle_fasteoi_nmi, but handling the dev_id cookie
964 * as a percpu pointer.
966 void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
968 struct irq_chip *chip = irq_desc_get_chip(desc);
969 struct irqaction *action = desc->action;
970 unsigned int irq = irq_desc_get_irq(desc);
973 __kstat_incr_irqs_this_cpu(desc);
975 trace_irq_handler_entry(irq, action);
976 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
977 trace_irq_handler_exit(irq, action, res);
980 chip->irq_eoi(&desc->irq_data);
984 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
985 int is_chained, const char *name)
988 handle = handle_bad_irq;
990 struct irq_data *irq_data = &desc->irq_data;
991 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
993 * With hierarchical domains we might run into a
994 * situation where the outermost chip is not yet set
995 * up, but the inner chips are there. Instead of
996 * bailing we install the handler, but obviously we
997 * cannot enable/startup the interrupt at this point.
1000 if (irq_data->chip != &no_irq_chip)
1003 * Bail out if the outer chip is not set up
1004 * and the interrupt supposed to be started
1007 if (WARN_ON(is_chained))
1009 /* Try the parent */
1010 irq_data = irq_data->parent_data;
1013 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
1018 if (handle == handle_bad_irq) {
1019 if (desc->irq_data.chip != &no_irq_chip)
1021 irq_state_set_disabled(desc);
1023 desc->action = NULL;
1026 desc->handle_irq = handle;
1029 if (handle != handle_bad_irq && is_chained) {
1030 unsigned int type = irqd_get_trigger_type(&desc->irq_data);
1033 * We're about to start this interrupt immediately,
1034 * hence the need to set the trigger configuration.
1035 * But the .set_type callback may have overridden the
1036 * flow handler, ignoring that we're dealing with a
1037 * chained interrupt. Reset it immediately because we
1040 if (type != IRQ_TYPE_NONE) {
1041 __irq_set_trigger(desc, type);
1042 desc->handle_irq = handle;
1045 irq_settings_set_noprobe(desc);
1046 irq_settings_set_norequest(desc);
1047 irq_settings_set_nothread(desc);
1048 desc->action = &chained_action;
1049 irq_activate_and_startup(desc, IRQ_RESEND);
1054 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1057 unsigned long flags;
1058 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1063 __irq_do_set_handler(desc, handle, is_chained, name);
1064 irq_put_desc_busunlock(desc, flags);
1066 EXPORT_SYMBOL_GPL(__irq_set_handler);
1069 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1072 unsigned long flags;
1073 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1078 desc->irq_common_data.handler_data = data;
1079 __irq_do_set_handler(desc, handle, 1, NULL);
1081 irq_put_desc_busunlock(desc, flags);
1083 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1086 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
1087 irq_flow_handler_t handle, const char *name)
1089 irq_set_chip(irq, chip);
1090 __irq_set_handler(irq, handle, 0, name);
1092 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1094 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1096 unsigned long flags, trigger, tmp;
1097 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1103 * Warn when a driver sets the no autoenable flag on an already
1106 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1108 irq_settings_clr_and_set(desc, clr, set);
1110 trigger = irqd_get_trigger_type(&desc->irq_data);
1112 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1113 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1114 if (irq_settings_has_no_balance_set(desc))
1115 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1116 if (irq_settings_is_per_cpu(desc))
1117 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1118 if (irq_settings_can_move_pcntxt(desc))
1119 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1120 if (irq_settings_is_level(desc))
1121 irqd_set(&desc->irq_data, IRQD_LEVEL);
1123 tmp = irq_settings_get_trigger_mask(desc);
1124 if (tmp != IRQ_TYPE_NONE)
1127 irqd_set(&desc->irq_data, trigger);
1129 irq_put_desc_unlock(desc, flags);
1131 EXPORT_SYMBOL_GPL(irq_modify_status);
1134 * irq_cpu_online - Invoke all irq_cpu_online functions.
1136 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1139 void irq_cpu_online(void)
1141 struct irq_desc *desc;
1142 struct irq_chip *chip;
1143 unsigned long flags;
1146 for_each_active_irq(irq) {
1147 desc = irq_to_desc(irq);
1151 raw_spin_lock_irqsave(&desc->lock, flags);
1153 chip = irq_data_get_irq_chip(&desc->irq_data);
1154 if (chip && chip->irq_cpu_online &&
1155 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1156 !irqd_irq_disabled(&desc->irq_data)))
1157 chip->irq_cpu_online(&desc->irq_data);
1159 raw_spin_unlock_irqrestore(&desc->lock, flags);
1164 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1166 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1169 void irq_cpu_offline(void)
1171 struct irq_desc *desc;
1172 struct irq_chip *chip;
1173 unsigned long flags;
1176 for_each_active_irq(irq) {
1177 desc = irq_to_desc(irq);
1181 raw_spin_lock_irqsave(&desc->lock, flags);
1183 chip = irq_data_get_irq_chip(&desc->irq_data);
1184 if (chip && chip->irq_cpu_offline &&
1185 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1186 !irqd_irq_disabled(&desc->irq_data)))
1187 chip->irq_cpu_offline(&desc->irq_data);
1189 raw_spin_unlock_irqrestore(&desc->lock, flags);
1193 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1195 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1197 * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1198 * stacked on transparent controllers
1200 * @desc: the interrupt description structure for this irq
1202 * Like handle_fasteoi_irq(), but for use with hierarchy where
1203 * the irq_chip also needs to have its ->irq_ack() function
1206 void handle_fasteoi_ack_irq(struct irq_desc *desc)
1208 struct irq_chip *chip = desc->irq_data.chip;
1210 raw_spin_lock(&desc->lock);
1212 if (!irq_may_run(desc))
1215 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1218 * If its disabled or no action available
1219 * then mask it and get out of here:
1221 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1222 desc->istate |= IRQS_PENDING;
1227 kstat_incr_irqs_this_cpu(desc);
1228 if (desc->istate & IRQS_ONESHOT)
1231 /* Start handling the irq */
1232 desc->irq_data.chip->irq_ack(&desc->irq_data);
1234 preflow_handler(desc);
1235 handle_irq_event(desc);
1237 cond_unmask_eoi_irq(desc, chip);
1239 raw_spin_unlock(&desc->lock);
1242 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1243 chip->irq_eoi(&desc->irq_data);
1244 raw_spin_unlock(&desc->lock);
1246 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1249 * handle_fasteoi_mask_irq - irq handler for level hierarchy
1250 * stacked on transparent controllers
1252 * @desc: the interrupt description structure for this irq
1254 * Like handle_fasteoi_irq(), but for use with hierarchy where
1255 * the irq_chip also needs to have its ->irq_mask_ack() function
1258 void handle_fasteoi_mask_irq(struct irq_desc *desc)
1260 struct irq_chip *chip = desc->irq_data.chip;
1262 raw_spin_lock(&desc->lock);
1265 if (!irq_may_run(desc))
1268 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1271 * If its disabled or no action available
1272 * then mask it and get out of here:
1274 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1275 desc->istate |= IRQS_PENDING;
1280 kstat_incr_irqs_this_cpu(desc);
1281 if (desc->istate & IRQS_ONESHOT)
1284 preflow_handler(desc);
1285 handle_irq_event(desc);
1287 cond_unmask_eoi_irq(desc, chip);
1289 raw_spin_unlock(&desc->lock);
1292 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1293 chip->irq_eoi(&desc->irq_data);
1294 raw_spin_unlock(&desc->lock);
1296 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1298 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1301 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1303 * @data: Pointer to interrupt specific data
1305 void irq_chip_enable_parent(struct irq_data *data)
1307 data = data->parent_data;
1308 if (data->chip->irq_enable)
1309 data->chip->irq_enable(data);
1311 data->chip->irq_unmask(data);
1313 EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1316 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1318 * @data: Pointer to interrupt specific data
1320 void irq_chip_disable_parent(struct irq_data *data)
1322 data = data->parent_data;
1323 if (data->chip->irq_disable)
1324 data->chip->irq_disable(data);
1326 data->chip->irq_mask(data);
1328 EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1331 * irq_chip_ack_parent - Acknowledge the parent interrupt
1332 * @data: Pointer to interrupt specific data
1334 void irq_chip_ack_parent(struct irq_data *data)
1336 data = data->parent_data;
1337 data->chip->irq_ack(data);
1339 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1342 * irq_chip_mask_parent - Mask the parent interrupt
1343 * @data: Pointer to interrupt specific data
1345 void irq_chip_mask_parent(struct irq_data *data)
1347 data = data->parent_data;
1348 data->chip->irq_mask(data);
1350 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1353 * irq_chip_mask_ack_parent - Mask and acknowledge the parent interrupt
1354 * @data: Pointer to interrupt specific data
1356 void irq_chip_mask_ack_parent(struct irq_data *data)
1358 data = data->parent_data;
1359 data->chip->irq_mask_ack(data);
1361 EXPORT_SYMBOL_GPL(irq_chip_mask_ack_parent);
1364 * irq_chip_unmask_parent - Unmask the parent interrupt
1365 * @data: Pointer to interrupt specific data
1367 void irq_chip_unmask_parent(struct irq_data *data)
1369 data = data->parent_data;
1370 data->chip->irq_unmask(data);
1372 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1375 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1376 * @data: Pointer to interrupt specific data
1378 void irq_chip_eoi_parent(struct irq_data *data)
1380 data = data->parent_data;
1381 data->chip->irq_eoi(data);
1383 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1386 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1387 * @data: Pointer to interrupt specific data
1388 * @dest: The affinity mask to set
1389 * @force: Flag to enforce setting (disable online checks)
1391 * Conditinal, as the underlying parent chip might not implement it.
1393 int irq_chip_set_affinity_parent(struct irq_data *data,
1394 const struct cpumask *dest, bool force)
1396 data = data->parent_data;
1397 if (data->chip->irq_set_affinity)
1398 return data->chip->irq_set_affinity(data, dest, force);
1402 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1405 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1406 * @data: Pointer to interrupt specific data
1407 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1409 * Conditional, as the underlying parent chip might not implement it.
1411 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1413 data = data->parent_data;
1415 if (data->chip->irq_set_type)
1416 return data->chip->irq_set_type(data, type);
1420 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1423 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1424 * @data: Pointer to interrupt specific data
1426 * Iterate through the domain hierarchy of the interrupt and check
1427 * whether a hw retrigger function exists. If yes, invoke it.
1429 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1431 for (data = data->parent_data; data; data = data->parent_data)
1432 if (data->chip && data->chip->irq_retrigger)
1433 return data->chip->irq_retrigger(data);
1439 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1440 * @data: Pointer to interrupt specific data
1441 * @vcpu_info: The vcpu affinity information
1443 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1445 data = data->parent_data;
1446 if (data->chip->irq_set_vcpu_affinity)
1447 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1453 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1454 * @data: Pointer to interrupt specific data
1455 * @on: Whether to set or reset the wake-up capability of this irq
1457 * Conditional, as the underlying parent chip might not implement it.
1459 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1461 data = data->parent_data;
1463 if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1466 if (data->chip->irq_set_wake)
1467 return data->chip->irq_set_wake(data, on);
1471 EXPORT_SYMBOL_GPL(irq_chip_set_wake_parent);
1474 * irq_chip_request_resources_parent - Request resources on the parent interrupt
1475 * @data: Pointer to interrupt specific data
1477 int irq_chip_request_resources_parent(struct irq_data *data)
1479 data = data->parent_data;
1481 if (data->chip->irq_request_resources)
1482 return data->chip->irq_request_resources(data);
1486 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);
1489 * irq_chip_release_resources_parent - Release resources on the parent interrupt
1490 * @data: Pointer to interrupt specific data
1492 void irq_chip_release_resources_parent(struct irq_data *data)
1494 data = data->parent_data;
1495 if (data->chip->irq_release_resources)
1496 data->chip->irq_release_resources(data);
1498 EXPORT_SYMBOL_GPL(irq_chip_release_resources_parent);
1502 * irq_chip_compose_msi_msg - Componse msi message for a irq chip
1503 * @data: Pointer to interrupt specific data
1504 * @msg: Pointer to the MSI message
1506 * For hierarchical domains we find the first chip in the hierarchy
1507 * which implements the irq_compose_msi_msg callback. For non
1508 * hierarchical we use the top level chip.
1510 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1512 struct irq_data *pos = NULL;
1514 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1515 for (; data; data = data->parent_data)
1517 if (data->chip && data->chip->irq_compose_msi_msg)
1522 pos->chip->irq_compose_msi_msg(pos, msg);
1528 * irq_chip_pm_get - Enable power for an IRQ chip
1529 * @data: Pointer to interrupt specific data
1531 * Enable the power to the IRQ chip referenced by the interrupt data
1534 int irq_chip_pm_get(struct irq_data *data)
1538 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
1539 retval = pm_runtime_get_sync(data->chip->parent_device);
1541 pm_runtime_put_noidle(data->chip->parent_device);
1550 * irq_chip_pm_put - Disable power for an IRQ chip
1551 * @data: Pointer to interrupt specific data
1553 * Disable the power to the IRQ chip referenced by the interrupt data
1554 * structure, belongs. Note that power will only be disabled, once this
1555 * function has been called for all IRQs that have called irq_chip_pm_get().
1557 int irq_chip_pm_put(struct irq_data *data)
1561 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
1562 retval = pm_runtime_put(data->chip->parent_device);
1564 return (retval < 0) ? retval : 0;