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 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);
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);
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 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
663 static inline void preflow_handler(struct irq_desc *desc)
665 if (desc->preflow_handler)
666 desc->preflow_handler(&desc->irq_data);
669 static inline void preflow_handler(struct irq_desc *desc) { }
672 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
674 if (!(desc->istate & IRQS_ONESHOT)) {
675 chip->irq_eoi(&desc->irq_data);
679 * We need to unmask in the following cases:
680 * - Oneshot irq which did not wake the thread (caused by a
681 * spurious interrupt or a primary handler handling it
684 if (!irqd_irq_disabled(&desc->irq_data) &&
685 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
686 chip->irq_eoi(&desc->irq_data);
688 } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
689 chip->irq_eoi(&desc->irq_data);
694 * handle_fasteoi_irq - irq handler for transparent controllers
695 * @desc: the interrupt description structure for this irq
697 * Only a single callback will be issued to the chip: an ->eoi()
698 * call when the interrupt has been serviced. This enables support
699 * for modern forms of interrupt handlers, which handle the flow
700 * details in hardware, transparently.
702 void handle_fasteoi_irq(struct irq_desc *desc)
704 struct irq_chip *chip = desc->irq_data.chip;
706 raw_spin_lock(&desc->lock);
708 if (!irq_may_run(desc))
711 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
714 * If its disabled or no action available
715 * then mask it and get out of here:
717 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
718 desc->istate |= IRQS_PENDING;
723 kstat_incr_irqs_this_cpu(desc);
724 if (desc->istate & IRQS_ONESHOT)
727 preflow_handler(desc);
728 handle_irq_event(desc);
730 cond_unmask_eoi_irq(desc, chip);
732 raw_spin_unlock(&desc->lock);
735 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
736 chip->irq_eoi(&desc->irq_data);
737 raw_spin_unlock(&desc->lock);
739 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
742 * handle_fasteoi_nmi - irq handler for NMI interrupt lines
743 * @desc: the interrupt description structure for this irq
745 * A simple NMI-safe handler, considering the restrictions
748 * Only a single callback will be issued to the chip: an ->eoi()
749 * call when the interrupt has been serviced. This enables support
750 * for modern forms of interrupt handlers, which handle the flow
751 * details in hardware, transparently.
753 void handle_fasteoi_nmi(struct irq_desc *desc)
755 struct irq_chip *chip = irq_desc_get_chip(desc);
756 struct irqaction *action = desc->action;
757 unsigned int irq = irq_desc_get_irq(desc);
760 __kstat_incr_irqs_this_cpu(desc);
762 trace_irq_handler_entry(irq, action);
764 * NMIs cannot be shared, there is only one action.
766 res = action->handler(irq, action->dev_id);
767 trace_irq_handler_exit(irq, action, res);
770 chip->irq_eoi(&desc->irq_data);
772 EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);
775 * handle_edge_irq - edge type IRQ handler
776 * @desc: the interrupt description structure for this irq
778 * Interrupt occures on the falling and/or rising edge of a hardware
779 * signal. The occurrence is latched into the irq controller hardware
780 * and must be acked in order to be reenabled. After the ack another
781 * interrupt can happen on the same source even before the first one
782 * is handled by the associated event handler. If this happens it
783 * might be necessary to disable (mask) the interrupt depending on the
784 * controller hardware. This requires to reenable the interrupt inside
785 * of the loop which handles the interrupts which have arrived while
786 * the handler was running. If all pending interrupts are handled, the
789 void handle_edge_irq(struct irq_desc *desc)
791 raw_spin_lock(&desc->lock);
793 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
795 if (!irq_may_run(desc)) {
796 desc->istate |= IRQS_PENDING;
802 * If its disabled or no action available then mask it and get
805 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
806 desc->istate |= IRQS_PENDING;
811 kstat_incr_irqs_this_cpu(desc);
813 /* Start handling the irq */
814 desc->irq_data.chip->irq_ack(&desc->irq_data);
817 if (unlikely(!desc->action)) {
823 * When another irq arrived while we were handling
824 * one, we could have masked the irq.
825 * Renable it, if it was not disabled in meantime.
827 if (unlikely(desc->istate & IRQS_PENDING)) {
828 if (!irqd_irq_disabled(&desc->irq_data) &&
829 irqd_irq_masked(&desc->irq_data))
833 handle_irq_event(desc);
835 } while ((desc->istate & IRQS_PENDING) &&
836 !irqd_irq_disabled(&desc->irq_data));
839 raw_spin_unlock(&desc->lock);
841 EXPORT_SYMBOL(handle_edge_irq);
843 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
845 * handle_edge_eoi_irq - edge eoi type IRQ handler
846 * @desc: the interrupt description structure for this irq
848 * Similar as the above handle_edge_irq, but using eoi and w/o the
851 void handle_edge_eoi_irq(struct irq_desc *desc)
853 struct irq_chip *chip = irq_desc_get_chip(desc);
855 raw_spin_lock(&desc->lock);
857 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
859 if (!irq_may_run(desc)) {
860 desc->istate |= IRQS_PENDING;
865 * If its disabled or no action available then mask it and get
868 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
869 desc->istate |= IRQS_PENDING;
873 kstat_incr_irqs_this_cpu(desc);
876 if (unlikely(!desc->action))
879 handle_irq_event(desc);
881 } while ((desc->istate & IRQS_PENDING) &&
882 !irqd_irq_disabled(&desc->irq_data));
885 chip->irq_eoi(&desc->irq_data);
886 raw_spin_unlock(&desc->lock);
891 * handle_percpu_irq - Per CPU local irq handler
892 * @desc: the interrupt description structure for this irq
894 * Per CPU interrupts on SMP machines without locking requirements
896 void handle_percpu_irq(struct irq_desc *desc)
898 struct irq_chip *chip = irq_desc_get_chip(desc);
901 * PER CPU interrupts are not serialized. Do not touch
904 __kstat_incr_irqs_this_cpu(desc);
907 chip->irq_ack(&desc->irq_data);
909 handle_irq_event_percpu(desc);
912 chip->irq_eoi(&desc->irq_data);
916 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
917 * @desc: the interrupt description structure for this irq
919 * Per CPU interrupts on SMP machines without locking requirements. Same as
920 * handle_percpu_irq() above but with the following extras:
922 * action->percpu_dev_id is a pointer to percpu variables which
923 * contain the real device id for the cpu on which this handler is
926 void handle_percpu_devid_irq(struct irq_desc *desc)
928 struct irq_chip *chip = irq_desc_get_chip(desc);
929 struct irqaction *action = desc->action;
930 unsigned int irq = irq_desc_get_irq(desc);
934 * PER CPU interrupts are not serialized. Do not touch
937 __kstat_incr_irqs_this_cpu(desc);
940 chip->irq_ack(&desc->irq_data);
942 if (likely(action)) {
943 trace_irq_handler_entry(irq, action);
944 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
945 trace_irq_handler_exit(irq, action, res);
947 unsigned int cpu = smp_processor_id();
948 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
951 irq_percpu_disable(desc, cpu);
953 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
954 enabled ? " and unmasked" : "", irq, cpu);
958 chip->irq_eoi(&desc->irq_data);
962 * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
964 * @desc: the interrupt description structure for this irq
966 * Similar to handle_fasteoi_nmi, but handling the dev_id cookie
967 * as a percpu pointer.
969 void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
971 struct irq_chip *chip = irq_desc_get_chip(desc);
972 struct irqaction *action = desc->action;
973 unsigned int irq = irq_desc_get_irq(desc);
976 __kstat_incr_irqs_this_cpu(desc);
978 trace_irq_handler_entry(irq, action);
979 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
980 trace_irq_handler_exit(irq, action, res);
983 chip->irq_eoi(&desc->irq_data);
987 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
988 int is_chained, const char *name)
991 handle = handle_bad_irq;
993 struct irq_data *irq_data = &desc->irq_data;
994 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
996 * With hierarchical domains we might run into a
997 * situation where the outermost chip is not yet set
998 * up, but the inner chips are there. Instead of
999 * bailing we install the handler, but obviously we
1000 * cannot enable/startup the interrupt at this point.
1003 if (irq_data->chip != &no_irq_chip)
1006 * Bail out if the outer chip is not set up
1007 * and the interrupt supposed to be started
1010 if (WARN_ON(is_chained))
1012 /* Try the parent */
1013 irq_data = irq_data->parent_data;
1016 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
1021 if (handle == handle_bad_irq) {
1022 if (desc->irq_data.chip != &no_irq_chip)
1024 irq_state_set_disabled(desc);
1026 desc->action = NULL;
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 irq_activate_and_startup(desc, IRQ_RESEND);
1057 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1060 unsigned long flags;
1061 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1066 __irq_do_set_handler(desc, handle, is_chained, name);
1067 irq_put_desc_busunlock(desc, flags);
1069 EXPORT_SYMBOL_GPL(__irq_set_handler);
1072 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1075 unsigned long flags;
1076 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1081 desc->irq_common_data.handler_data = data;
1082 __irq_do_set_handler(desc, handle, 1, NULL);
1084 irq_put_desc_busunlock(desc, flags);
1086 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1089 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
1090 irq_flow_handler_t handle, const char *name)
1092 irq_set_chip(irq, chip);
1093 __irq_set_handler(irq, handle, 0, name);
1095 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1097 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1099 unsigned long flags, trigger, tmp;
1100 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1106 * Warn when a driver sets the no autoenable flag on an already
1109 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1111 irq_settings_clr_and_set(desc, clr, set);
1113 trigger = irqd_get_trigger_type(&desc->irq_data);
1115 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1116 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1117 if (irq_settings_has_no_balance_set(desc))
1118 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1119 if (irq_settings_is_per_cpu(desc))
1120 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1121 if (irq_settings_can_move_pcntxt(desc))
1122 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1123 if (irq_settings_is_level(desc))
1124 irqd_set(&desc->irq_data, IRQD_LEVEL);
1126 tmp = irq_settings_get_trigger_mask(desc);
1127 if (tmp != IRQ_TYPE_NONE)
1130 irqd_set(&desc->irq_data, trigger);
1132 irq_put_desc_unlock(desc, flags);
1134 EXPORT_SYMBOL_GPL(irq_modify_status);
1137 * irq_cpu_online - Invoke all irq_cpu_online functions.
1139 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1142 void irq_cpu_online(void)
1144 struct irq_desc *desc;
1145 struct irq_chip *chip;
1146 unsigned long flags;
1149 for_each_active_irq(irq) {
1150 desc = irq_to_desc(irq);
1154 raw_spin_lock_irqsave(&desc->lock, flags);
1156 chip = irq_data_get_irq_chip(&desc->irq_data);
1157 if (chip && chip->irq_cpu_online &&
1158 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1159 !irqd_irq_disabled(&desc->irq_data)))
1160 chip->irq_cpu_online(&desc->irq_data);
1162 raw_spin_unlock_irqrestore(&desc->lock, flags);
1167 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1169 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1172 void irq_cpu_offline(void)
1174 struct irq_desc *desc;
1175 struct irq_chip *chip;
1176 unsigned long flags;
1179 for_each_active_irq(irq) {
1180 desc = irq_to_desc(irq);
1184 raw_spin_lock_irqsave(&desc->lock, flags);
1186 chip = irq_data_get_irq_chip(&desc->irq_data);
1187 if (chip && chip->irq_cpu_offline &&
1188 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1189 !irqd_irq_disabled(&desc->irq_data)))
1190 chip->irq_cpu_offline(&desc->irq_data);
1192 raw_spin_unlock_irqrestore(&desc->lock, flags);
1196 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1198 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1200 * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1201 * stacked on transparent controllers
1203 * @desc: the interrupt description structure for this irq
1205 * Like handle_fasteoi_irq(), but for use with hierarchy where
1206 * the irq_chip also needs to have its ->irq_ack() function
1209 void handle_fasteoi_ack_irq(struct irq_desc *desc)
1211 struct irq_chip *chip = desc->irq_data.chip;
1213 raw_spin_lock(&desc->lock);
1215 if (!irq_may_run(desc))
1218 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1221 * If its disabled or no action available
1222 * then mask it and get out of here:
1224 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1225 desc->istate |= IRQS_PENDING;
1230 kstat_incr_irqs_this_cpu(desc);
1231 if (desc->istate & IRQS_ONESHOT)
1234 /* Start handling the irq */
1235 desc->irq_data.chip->irq_ack(&desc->irq_data);
1237 preflow_handler(desc);
1238 handle_irq_event(desc);
1240 cond_unmask_eoi_irq(desc, chip);
1242 raw_spin_unlock(&desc->lock);
1245 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1246 chip->irq_eoi(&desc->irq_data);
1247 raw_spin_unlock(&desc->lock);
1249 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1252 * handle_fasteoi_mask_irq - irq handler for level hierarchy
1253 * stacked on transparent controllers
1255 * @desc: the interrupt description structure for this irq
1257 * Like handle_fasteoi_irq(), but for use with hierarchy where
1258 * the irq_chip also needs to have its ->irq_mask_ack() function
1261 void handle_fasteoi_mask_irq(struct irq_desc *desc)
1263 struct irq_chip *chip = desc->irq_data.chip;
1265 raw_spin_lock(&desc->lock);
1268 if (!irq_may_run(desc))
1271 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1274 * If its disabled or no action available
1275 * then mask it and get out of here:
1277 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1278 desc->istate |= IRQS_PENDING;
1283 kstat_incr_irqs_this_cpu(desc);
1284 if (desc->istate & IRQS_ONESHOT)
1287 preflow_handler(desc);
1288 handle_irq_event(desc);
1290 cond_unmask_eoi_irq(desc, chip);
1292 raw_spin_unlock(&desc->lock);
1295 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1296 chip->irq_eoi(&desc->irq_data);
1297 raw_spin_unlock(&desc->lock);
1299 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1301 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1304 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1306 * @data: Pointer to interrupt specific data
1308 void irq_chip_enable_parent(struct irq_data *data)
1310 data = data->parent_data;
1311 if (data->chip->irq_enable)
1312 data->chip->irq_enable(data);
1314 data->chip->irq_unmask(data);
1316 EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1319 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1321 * @data: Pointer to interrupt specific data
1323 void irq_chip_disable_parent(struct irq_data *data)
1325 data = data->parent_data;
1326 if (data->chip->irq_disable)
1327 data->chip->irq_disable(data);
1329 data->chip->irq_mask(data);
1331 EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1334 * irq_chip_ack_parent - Acknowledge the parent interrupt
1335 * @data: Pointer to interrupt specific data
1337 void irq_chip_ack_parent(struct irq_data *data)
1339 data = data->parent_data;
1340 data->chip->irq_ack(data);
1342 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1345 * irq_chip_mask_parent - Mask the parent interrupt
1346 * @data: Pointer to interrupt specific data
1348 void irq_chip_mask_parent(struct irq_data *data)
1350 data = data->parent_data;
1351 data->chip->irq_mask(data);
1353 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1356 * irq_chip_mask_ack_parent - Mask and acknowledge the parent interrupt
1357 * @data: Pointer to interrupt specific data
1359 void irq_chip_mask_ack_parent(struct irq_data *data)
1361 data = data->parent_data;
1362 data->chip->irq_mask_ack(data);
1364 EXPORT_SYMBOL_GPL(irq_chip_mask_ack_parent);
1367 * irq_chip_unmask_parent - Unmask the parent interrupt
1368 * @data: Pointer to interrupt specific data
1370 void irq_chip_unmask_parent(struct irq_data *data)
1372 data = data->parent_data;
1373 data->chip->irq_unmask(data);
1375 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1378 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1379 * @data: Pointer to interrupt specific data
1381 void irq_chip_eoi_parent(struct irq_data *data)
1383 data = data->parent_data;
1384 data->chip->irq_eoi(data);
1386 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1389 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1390 * @data: Pointer to interrupt specific data
1391 * @dest: The affinity mask to set
1392 * @force: Flag to enforce setting (disable online checks)
1394 * Conditinal, as the underlying parent chip might not implement it.
1396 int irq_chip_set_affinity_parent(struct irq_data *data,
1397 const struct cpumask *dest, bool force)
1399 data = data->parent_data;
1400 if (data->chip->irq_set_affinity)
1401 return data->chip->irq_set_affinity(data, dest, force);
1405 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1408 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1409 * @data: Pointer to interrupt specific data
1410 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1412 * Conditional, as the underlying parent chip might not implement it.
1414 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1416 data = data->parent_data;
1418 if (data->chip->irq_set_type)
1419 return data->chip->irq_set_type(data, type);
1423 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1426 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1427 * @data: Pointer to interrupt specific data
1429 * Iterate through the domain hierarchy of the interrupt and check
1430 * whether a hw retrigger function exists. If yes, invoke it.
1432 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1434 for (data = data->parent_data; data; data = data->parent_data)
1435 if (data->chip && data->chip->irq_retrigger)
1436 return data->chip->irq_retrigger(data);
1442 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1443 * @data: Pointer to interrupt specific data
1444 * @vcpu_info: The vcpu affinity information
1446 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1448 data = data->parent_data;
1449 if (data->chip->irq_set_vcpu_affinity)
1450 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1456 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1457 * @data: Pointer to interrupt specific data
1458 * @on: Whether to set or reset the wake-up capability of this irq
1460 * Conditional, as the underlying parent chip might not implement it.
1462 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1464 data = data->parent_data;
1466 if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1469 if (data->chip->irq_set_wake)
1470 return data->chip->irq_set_wake(data, on);
1474 EXPORT_SYMBOL_GPL(irq_chip_set_wake_parent);
1477 * irq_chip_request_resources_parent - Request resources on the parent interrupt
1478 * @data: Pointer to interrupt specific data
1480 int irq_chip_request_resources_parent(struct irq_data *data)
1482 data = data->parent_data;
1484 if (data->chip->irq_request_resources)
1485 return data->chip->irq_request_resources(data);
1487 /* no error on missing optional irq_chip::irq_request_resources */
1490 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);
1493 * irq_chip_release_resources_parent - Release resources on the parent interrupt
1494 * @data: Pointer to interrupt specific data
1496 void irq_chip_release_resources_parent(struct irq_data *data)
1498 data = data->parent_data;
1499 if (data->chip->irq_release_resources)
1500 data->chip->irq_release_resources(data);
1502 EXPORT_SYMBOL_GPL(irq_chip_release_resources_parent);
1506 * irq_chip_compose_msi_msg - Componse msi message for a irq chip
1507 * @data: Pointer to interrupt specific data
1508 * @msg: Pointer to the MSI message
1510 * For hierarchical domains we find the first chip in the hierarchy
1511 * which implements the irq_compose_msi_msg callback. For non
1512 * hierarchical we use the top level chip.
1514 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1516 struct irq_data *pos = NULL;
1518 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1519 for (; data; data = data->parent_data)
1521 if (data->chip && data->chip->irq_compose_msi_msg)
1526 pos->chip->irq_compose_msi_msg(pos, msg);
1532 * irq_chip_pm_get - Enable power for an IRQ chip
1533 * @data: Pointer to interrupt specific data
1535 * Enable the power to the IRQ chip referenced by the interrupt data
1538 int irq_chip_pm_get(struct irq_data *data)
1542 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
1543 retval = pm_runtime_get_sync(data->chip->parent_device);
1545 pm_runtime_put_noidle(data->chip->parent_device);
1554 * irq_chip_pm_put - Disable power for an IRQ chip
1555 * @data: Pointer to interrupt specific data
1557 * Disable the power to the IRQ chip referenced by the interrupt data
1558 * structure, belongs. Note that power will only be disabled, once this
1559 * function has been called for all IRQs that have called irq_chip_pm_get().
1561 int irq_chip_pm_put(struct irq_data *data)
1565 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
1566 retval = pm_runtime_put(data->chip->parent_device);
1568 return (retval < 0) ? retval : 0;