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_edge_irq - edge type IRQ handler
743 * @desc: the interrupt description structure for this irq
745 * Interrupt occures on the falling and/or rising edge of a hardware
746 * signal. The occurrence is latched into the irq controller hardware
747 * and must be acked in order to be reenabled. After the ack another
748 * interrupt can happen on the same source even before the first one
749 * is handled by the associated event handler. If this happens it
750 * might be necessary to disable (mask) the interrupt depending on the
751 * controller hardware. This requires to reenable the interrupt inside
752 * of the loop which handles the interrupts which have arrived while
753 * the handler was running. If all pending interrupts are handled, the
756 void handle_edge_irq(struct irq_desc *desc)
758 raw_spin_lock(&desc->lock);
760 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
762 if (!irq_may_run(desc)) {
763 desc->istate |= IRQS_PENDING;
769 * If its disabled or no action available then mask it and get
772 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
773 desc->istate |= IRQS_PENDING;
778 kstat_incr_irqs_this_cpu(desc);
780 /* Start handling the irq */
781 desc->irq_data.chip->irq_ack(&desc->irq_data);
784 if (unlikely(!desc->action)) {
790 * When another irq arrived while we were handling
791 * one, we could have masked the irq.
792 * Renable it, if it was not disabled in meantime.
794 if (unlikely(desc->istate & IRQS_PENDING)) {
795 if (!irqd_irq_disabled(&desc->irq_data) &&
796 irqd_irq_masked(&desc->irq_data))
800 handle_irq_event(desc);
802 } while ((desc->istate & IRQS_PENDING) &&
803 !irqd_irq_disabled(&desc->irq_data));
806 raw_spin_unlock(&desc->lock);
808 EXPORT_SYMBOL(handle_edge_irq);
810 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
812 * handle_edge_eoi_irq - edge eoi type IRQ handler
813 * @desc: the interrupt description structure for this irq
815 * Similar as the above handle_edge_irq, but using eoi and w/o the
818 void handle_edge_eoi_irq(struct irq_desc *desc)
820 struct irq_chip *chip = irq_desc_get_chip(desc);
822 raw_spin_lock(&desc->lock);
824 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
826 if (!irq_may_run(desc)) {
827 desc->istate |= IRQS_PENDING;
832 * If its disabled or no action available then mask it and get
835 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
836 desc->istate |= IRQS_PENDING;
840 kstat_incr_irqs_this_cpu(desc);
843 if (unlikely(!desc->action))
846 handle_irq_event(desc);
848 } while ((desc->istate & IRQS_PENDING) &&
849 !irqd_irq_disabled(&desc->irq_data));
852 chip->irq_eoi(&desc->irq_data);
853 raw_spin_unlock(&desc->lock);
858 * handle_percpu_irq - Per CPU local irq handler
859 * @desc: the interrupt description structure for this irq
861 * Per CPU interrupts on SMP machines without locking requirements
863 void handle_percpu_irq(struct irq_desc *desc)
865 struct irq_chip *chip = irq_desc_get_chip(desc);
868 * PER CPU interrupts are not serialized. Do not touch
871 __kstat_incr_irqs_this_cpu(desc);
874 chip->irq_ack(&desc->irq_data);
876 handle_irq_event_percpu(desc);
879 chip->irq_eoi(&desc->irq_data);
883 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
884 * @desc: the interrupt description structure for this irq
886 * Per CPU interrupts on SMP machines without locking requirements. Same as
887 * handle_percpu_irq() above but with the following extras:
889 * action->percpu_dev_id is a pointer to percpu variables which
890 * contain the real device id for the cpu on which this handler is
893 void handle_percpu_devid_irq(struct irq_desc *desc)
895 struct irq_chip *chip = irq_desc_get_chip(desc);
896 struct irqaction *action = desc->action;
897 unsigned int irq = irq_desc_get_irq(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 if (likely(action)) {
910 trace_irq_handler_entry(irq, action);
911 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
912 trace_irq_handler_exit(irq, action, res);
914 unsigned int cpu = smp_processor_id();
915 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
918 irq_percpu_disable(desc, cpu);
920 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
921 enabled ? " and unmasked" : "", irq, cpu);
925 chip->irq_eoi(&desc->irq_data);
929 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
930 int is_chained, const char *name)
933 handle = handle_bad_irq;
935 struct irq_data *irq_data = &desc->irq_data;
936 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
938 * With hierarchical domains we might run into a
939 * situation where the outermost chip is not yet set
940 * up, but the inner chips are there. Instead of
941 * bailing we install the handler, but obviously we
942 * cannot enable/startup the interrupt at this point.
945 if (irq_data->chip != &no_irq_chip)
948 * Bail out if the outer chip is not set up
949 * and the interrrupt supposed to be started
952 if (WARN_ON(is_chained))
955 irq_data = irq_data->parent_data;
958 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
963 if (handle == handle_bad_irq) {
964 if (desc->irq_data.chip != &no_irq_chip)
966 irq_state_set_disabled(desc);
971 desc->handle_irq = handle;
974 if (handle != handle_bad_irq && is_chained) {
975 unsigned int type = irqd_get_trigger_type(&desc->irq_data);
978 * We're about to start this interrupt immediately,
979 * hence the need to set the trigger configuration.
980 * But the .set_type callback may have overridden the
981 * flow handler, ignoring that we're dealing with a
982 * chained interrupt. Reset it immediately because we
985 if (type != IRQ_TYPE_NONE) {
986 __irq_set_trigger(desc, type);
987 desc->handle_irq = handle;
990 irq_settings_set_noprobe(desc);
991 irq_settings_set_norequest(desc);
992 irq_settings_set_nothread(desc);
993 desc->action = &chained_action;
994 irq_activate_and_startup(desc, IRQ_RESEND);
999 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1002 unsigned long flags;
1003 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1008 __irq_do_set_handler(desc, handle, is_chained, name);
1009 irq_put_desc_busunlock(desc, flags);
1011 EXPORT_SYMBOL_GPL(__irq_set_handler);
1014 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1017 unsigned long flags;
1018 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1023 desc->irq_common_data.handler_data = data;
1024 __irq_do_set_handler(desc, handle, 1, NULL);
1026 irq_put_desc_busunlock(desc, flags);
1028 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1031 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
1032 irq_flow_handler_t handle, const char *name)
1034 irq_set_chip(irq, chip);
1035 __irq_set_handler(irq, handle, 0, name);
1037 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1039 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1041 unsigned long flags, trigger, tmp;
1042 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1048 * Warn when a driver sets the no autoenable flag on an already
1051 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1053 irq_settings_clr_and_set(desc, clr, set);
1055 trigger = irqd_get_trigger_type(&desc->irq_data);
1057 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1058 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1059 if (irq_settings_has_no_balance_set(desc))
1060 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1061 if (irq_settings_is_per_cpu(desc))
1062 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1063 if (irq_settings_can_move_pcntxt(desc))
1064 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1065 if (irq_settings_is_level(desc))
1066 irqd_set(&desc->irq_data, IRQD_LEVEL);
1068 tmp = irq_settings_get_trigger_mask(desc);
1069 if (tmp != IRQ_TYPE_NONE)
1072 irqd_set(&desc->irq_data, trigger);
1074 irq_put_desc_unlock(desc, flags);
1076 EXPORT_SYMBOL_GPL(irq_modify_status);
1079 * irq_cpu_online - Invoke all irq_cpu_online functions.
1081 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1084 void irq_cpu_online(void)
1086 struct irq_desc *desc;
1087 struct irq_chip *chip;
1088 unsigned long flags;
1091 for_each_active_irq(irq) {
1092 desc = irq_to_desc(irq);
1096 raw_spin_lock_irqsave(&desc->lock, flags);
1098 chip = irq_data_get_irq_chip(&desc->irq_data);
1099 if (chip && chip->irq_cpu_online &&
1100 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1101 !irqd_irq_disabled(&desc->irq_data)))
1102 chip->irq_cpu_online(&desc->irq_data);
1104 raw_spin_unlock_irqrestore(&desc->lock, flags);
1109 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1111 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1114 void irq_cpu_offline(void)
1116 struct irq_desc *desc;
1117 struct irq_chip *chip;
1118 unsigned long flags;
1121 for_each_active_irq(irq) {
1122 desc = irq_to_desc(irq);
1126 raw_spin_lock_irqsave(&desc->lock, flags);
1128 chip = irq_data_get_irq_chip(&desc->irq_data);
1129 if (chip && chip->irq_cpu_offline &&
1130 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1131 !irqd_irq_disabled(&desc->irq_data)))
1132 chip->irq_cpu_offline(&desc->irq_data);
1134 raw_spin_unlock_irqrestore(&desc->lock, flags);
1138 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1140 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1142 * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1143 * stacked on transparent controllers
1145 * @desc: the interrupt description structure for this irq
1147 * Like handle_fasteoi_irq(), but for use with hierarchy where
1148 * the irq_chip also needs to have its ->irq_ack() function
1151 void handle_fasteoi_ack_irq(struct irq_desc *desc)
1153 struct irq_chip *chip = desc->irq_data.chip;
1155 raw_spin_lock(&desc->lock);
1157 if (!irq_may_run(desc))
1160 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1163 * If its disabled or no action available
1164 * then mask it and get out of here:
1166 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1167 desc->istate |= IRQS_PENDING;
1172 kstat_incr_irqs_this_cpu(desc);
1173 if (desc->istate & IRQS_ONESHOT)
1176 /* Start handling the irq */
1177 desc->irq_data.chip->irq_ack(&desc->irq_data);
1179 preflow_handler(desc);
1180 handle_irq_event(desc);
1182 cond_unmask_eoi_irq(desc, chip);
1184 raw_spin_unlock(&desc->lock);
1187 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1188 chip->irq_eoi(&desc->irq_data);
1189 raw_spin_unlock(&desc->lock);
1191 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1194 * handle_fasteoi_mask_irq - irq handler for level hierarchy
1195 * stacked on transparent controllers
1197 * @desc: the interrupt description structure for this irq
1199 * Like handle_fasteoi_irq(), but for use with hierarchy where
1200 * the irq_chip also needs to have its ->irq_mask_ack() function
1203 void handle_fasteoi_mask_irq(struct irq_desc *desc)
1205 struct irq_chip *chip = desc->irq_data.chip;
1207 raw_spin_lock(&desc->lock);
1210 if (!irq_may_run(desc))
1213 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1216 * If its disabled or no action available
1217 * then mask it and get out of here:
1219 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1220 desc->istate |= IRQS_PENDING;
1225 kstat_incr_irqs_this_cpu(desc);
1226 if (desc->istate & IRQS_ONESHOT)
1229 preflow_handler(desc);
1230 handle_irq_event(desc);
1232 cond_unmask_eoi_irq(desc, chip);
1234 raw_spin_unlock(&desc->lock);
1237 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1238 chip->irq_eoi(&desc->irq_data);
1239 raw_spin_unlock(&desc->lock);
1241 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1243 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1246 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1248 * @data: Pointer to interrupt specific data
1250 void irq_chip_enable_parent(struct irq_data *data)
1252 data = data->parent_data;
1253 if (data->chip->irq_enable)
1254 data->chip->irq_enable(data);
1256 data->chip->irq_unmask(data);
1258 EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1261 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1263 * @data: Pointer to interrupt specific data
1265 void irq_chip_disable_parent(struct irq_data *data)
1267 data = data->parent_data;
1268 if (data->chip->irq_disable)
1269 data->chip->irq_disable(data);
1271 data->chip->irq_mask(data);
1273 EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1276 * irq_chip_ack_parent - Acknowledge the parent interrupt
1277 * @data: Pointer to interrupt specific data
1279 void irq_chip_ack_parent(struct irq_data *data)
1281 data = data->parent_data;
1282 data->chip->irq_ack(data);
1284 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1287 * irq_chip_mask_parent - Mask the parent interrupt
1288 * @data: Pointer to interrupt specific data
1290 void irq_chip_mask_parent(struct irq_data *data)
1292 data = data->parent_data;
1293 data->chip->irq_mask(data);
1295 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1298 * irq_chip_unmask_parent - Unmask the parent interrupt
1299 * @data: Pointer to interrupt specific data
1301 void irq_chip_unmask_parent(struct irq_data *data)
1303 data = data->parent_data;
1304 data->chip->irq_unmask(data);
1306 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1309 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1310 * @data: Pointer to interrupt specific data
1312 void irq_chip_eoi_parent(struct irq_data *data)
1314 data = data->parent_data;
1315 data->chip->irq_eoi(data);
1317 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1320 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1321 * @data: Pointer to interrupt specific data
1322 * @dest: The affinity mask to set
1323 * @force: Flag to enforce setting (disable online checks)
1325 * Conditinal, as the underlying parent chip might not implement it.
1327 int irq_chip_set_affinity_parent(struct irq_data *data,
1328 const struct cpumask *dest, bool force)
1330 data = data->parent_data;
1331 if (data->chip->irq_set_affinity)
1332 return data->chip->irq_set_affinity(data, dest, force);
1336 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1339 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1340 * @data: Pointer to interrupt specific data
1341 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1343 * Conditional, as the underlying parent chip might not implement it.
1345 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1347 data = data->parent_data;
1349 if (data->chip->irq_set_type)
1350 return data->chip->irq_set_type(data, type);
1354 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1357 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1358 * @data: Pointer to interrupt specific data
1360 * Iterate through the domain hierarchy of the interrupt and check
1361 * whether a hw retrigger function exists. If yes, invoke it.
1363 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1365 for (data = data->parent_data; data; data = data->parent_data)
1366 if (data->chip && data->chip->irq_retrigger)
1367 return data->chip->irq_retrigger(data);
1373 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1374 * @data: Pointer to interrupt specific data
1375 * @vcpu_info: The vcpu affinity information
1377 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1379 data = data->parent_data;
1380 if (data->chip->irq_set_vcpu_affinity)
1381 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1387 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1388 * @data: Pointer to interrupt specific data
1389 * @on: Whether to set or reset the wake-up capability of this irq
1391 * Conditional, as the underlying parent chip might not implement it.
1393 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1395 data = data->parent_data;
1397 if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1400 if (data->chip->irq_set_wake)
1401 return data->chip->irq_set_wake(data, on);
1408 * irq_chip_compose_msi_msg - Componse msi message for a irq chip
1409 * @data: Pointer to interrupt specific data
1410 * @msg: Pointer to the MSI message
1412 * For hierarchical domains we find the first chip in the hierarchy
1413 * which implements the irq_compose_msi_msg callback. For non
1414 * hierarchical we use the top level chip.
1416 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1418 struct irq_data *pos = NULL;
1420 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1421 for (; data; data = data->parent_data)
1423 if (data->chip && data->chip->irq_compose_msi_msg)
1428 pos->chip->irq_compose_msi_msg(pos, msg);
1434 * irq_chip_pm_get - Enable power for an IRQ chip
1435 * @data: Pointer to interrupt specific data
1437 * Enable the power to the IRQ chip referenced by the interrupt data
1440 int irq_chip_pm_get(struct irq_data *data)
1444 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
1445 retval = pm_runtime_get_sync(data->chip->parent_device);
1447 pm_runtime_put_noidle(data->chip->parent_device);
1456 * irq_chip_pm_put - Disable power for an IRQ chip
1457 * @data: Pointer to interrupt specific data
1459 * Disable the power to the IRQ chip referenced by the interrupt data
1460 * structure, belongs. Note that power will only be disabled, once this
1461 * function has been called for all IRQs that have called irq_chip_pm_get().
1463 int irq_chip_pm_put(struct irq_data *data)
1467 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
1468 retval = pm_runtime_put(data->chip->parent_device);
1470 return (retval < 0) ? retval : 0;