1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
6 * This file contains the core interrupt handling code, for irq-chip based
7 * architectures. Detailed information is available in
8 * Documentation/core-api/genericirq.rst
11 #include <linux/irq.h>
12 #include <linux/msi.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/irqdomain.h>
18 #include <trace/events/irq.h>
20 #include "internals.h"
22 static irqreturn_t
bad_chained_irq(int irq
, void *dev_id
)
24 WARN_ONCE(1, "Chained irq %d should not call an action\n", irq
);
29 * Chained handlers should never call action on their IRQ. This default
30 * action will emit warning if such thing happens.
32 struct irqaction chained_action
= {
33 .handler
= bad_chained_irq
,
37 * irq_set_chip - set the irq chip for an irq
39 * @chip: pointer to irq chip description structure
41 int irq_set_chip(unsigned int irq
, struct irq_chip
*chip
)
44 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
52 desc
->irq_data
.chip
= chip
;
53 irq_put_desc_unlock(desc
, flags
);
55 * For !CONFIG_SPARSE_IRQ make the irq show up in
61 EXPORT_SYMBOL(irq_set_chip
);
64 * irq_set_irq_type - set the irq trigger type for an irq
66 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
68 int irq_set_irq_type(unsigned int irq
, unsigned int type
)
71 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, IRQ_GET_DESC_CHECK_GLOBAL
);
77 ret
= __irq_set_trigger(desc
, type
);
78 irq_put_desc_busunlock(desc
, flags
);
81 EXPORT_SYMBOL(irq_set_irq_type
);
84 * irq_set_handler_data - set irq handler data for an irq
85 * @irq: Interrupt number
86 * @data: Pointer to interrupt specific data
88 * Set the hardware irq controller data for an irq
90 int irq_set_handler_data(unsigned int irq
, void *data
)
93 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
97 desc
->irq_common_data
.handler_data
= data
;
98 irq_put_desc_unlock(desc
, flags
);
101 EXPORT_SYMBOL(irq_set_handler_data
);
104 * irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
105 * @irq_base: Interrupt number base
106 * @irq_offset: Interrupt number offset
107 * @entry: Pointer to MSI descriptor data
109 * Set the MSI descriptor entry for an irq at offset
111 int irq_set_msi_desc_off(unsigned int irq_base
, unsigned int irq_offset
,
112 struct msi_desc
*entry
)
115 struct irq_desc
*desc
= irq_get_desc_lock(irq_base
+ irq_offset
, &flags
, IRQ_GET_DESC_CHECK_GLOBAL
);
119 desc
->irq_common_data
.msi_desc
= entry
;
120 if (entry
&& !irq_offset
)
121 entry
->irq
= irq_base
;
122 irq_put_desc_unlock(desc
, flags
);
127 * irq_set_msi_desc - set MSI descriptor data for an irq
128 * @irq: Interrupt number
129 * @entry: Pointer to MSI descriptor data
131 * Set the MSI descriptor entry for an irq
133 int irq_set_msi_desc(unsigned int irq
, struct msi_desc
*entry
)
135 return irq_set_msi_desc_off(irq
, 0, entry
);
139 * irq_set_chip_data - set irq chip data for an irq
140 * @irq: Interrupt number
141 * @data: Pointer to chip specific data
143 * Set the hardware irq chip data for an irq
145 int irq_set_chip_data(unsigned int irq
, void *data
)
148 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
152 desc
->irq_data
.chip_data
= data
;
153 irq_put_desc_unlock(desc
, flags
);
156 EXPORT_SYMBOL(irq_set_chip_data
);
158 struct irq_data
*irq_get_irq_data(unsigned int irq
)
160 struct irq_desc
*desc
= irq_to_desc(irq
);
162 return desc
? &desc
->irq_data
: NULL
;
164 EXPORT_SYMBOL_GPL(irq_get_irq_data
);
166 static void irq_state_clr_disabled(struct irq_desc
*desc
)
168 irqd_clear(&desc
->irq_data
, IRQD_IRQ_DISABLED
);
171 static void irq_state_clr_masked(struct irq_desc
*desc
)
173 irqd_clear(&desc
->irq_data
, IRQD_IRQ_MASKED
);
176 static void irq_state_clr_started(struct irq_desc
*desc
)
178 irqd_clear(&desc
->irq_data
, IRQD_IRQ_STARTED
);
181 static void irq_state_set_started(struct irq_desc
*desc
)
183 irqd_set(&desc
->irq_data
, IRQD_IRQ_STARTED
);
194 __irq_startup_managed(struct irq_desc
*desc
, struct cpumask
*aff
, bool force
)
196 struct irq_data
*d
= irq_desc_get_irq_data(desc
);
198 if (!irqd_affinity_is_managed(d
))
199 return IRQ_STARTUP_NORMAL
;
201 irqd_clr_managed_shutdown(d
);
203 if (cpumask_any_and(aff
, cpu_online_mask
) >= nr_cpu_ids
) {
205 * Catch code which fiddles with enable_irq() on a managed
206 * and potentially shutdown IRQ. Chained interrupt
207 * installment or irq auto probing should not happen on
208 * managed irqs either.
210 if (WARN_ON_ONCE(force
))
211 return IRQ_STARTUP_ABORT
;
213 * The interrupt was requested, but there is no online CPU
214 * in it's affinity mask. Put it into managed shutdown
215 * state and let the cpu hotplug mechanism start it up once
216 * a CPU in the mask becomes available.
218 return IRQ_STARTUP_ABORT
;
221 * Managed interrupts have reserved resources, so this should not
224 if (WARN_ON(irq_domain_activate_irq(d
, false)))
225 return IRQ_STARTUP_ABORT
;
226 return IRQ_STARTUP_MANAGED
;
229 static __always_inline
int
230 __irq_startup_managed(struct irq_desc
*desc
, struct cpumask
*aff
, bool force
)
232 return IRQ_STARTUP_NORMAL
;
236 static int __irq_startup(struct irq_desc
*desc
)
238 struct irq_data
*d
= irq_desc_get_irq_data(desc
);
241 /* Warn if this interrupt is not activated but try nevertheless */
242 WARN_ON_ONCE(!irqd_is_activated(d
));
244 if (d
->chip
->irq_startup
) {
245 ret
= d
->chip
->irq_startup(d
);
246 irq_state_clr_disabled(desc
);
247 irq_state_clr_masked(desc
);
251 irq_state_set_started(desc
);
255 int irq_startup(struct irq_desc
*desc
, bool resend
, bool force
)
257 struct irq_data
*d
= irq_desc_get_irq_data(desc
);
258 struct cpumask
*aff
= irq_data_get_affinity_mask(d
);
263 if (irqd_is_started(d
)) {
266 switch (__irq_startup_managed(desc
, aff
, force
)) {
267 case IRQ_STARTUP_NORMAL
:
268 if (d
->chip
->flags
& IRQCHIP_AFFINITY_PRE_STARTUP
)
269 irq_setup_affinity(desc
);
270 ret
= __irq_startup(desc
);
271 if (!(d
->chip
->flags
& IRQCHIP_AFFINITY_PRE_STARTUP
))
272 irq_setup_affinity(desc
);
274 case IRQ_STARTUP_MANAGED
:
275 irq_do_set_affinity(d
, aff
, false);
276 ret
= __irq_startup(desc
);
278 case IRQ_STARTUP_ABORT
:
279 irqd_set_managed_shutdown(d
);
284 check_irq_resend(desc
, false);
289 int irq_activate(struct irq_desc
*desc
)
291 struct irq_data
*d
= irq_desc_get_irq_data(desc
);
293 if (!irqd_affinity_is_managed(d
))
294 return irq_domain_activate_irq(d
, false);
298 int irq_activate_and_startup(struct irq_desc
*desc
, bool resend
)
300 if (WARN_ON(irq_activate(desc
)))
302 return irq_startup(desc
, resend
, IRQ_START_FORCE
);
305 static void __irq_disable(struct irq_desc
*desc
, bool mask
);
307 void irq_shutdown(struct irq_desc
*desc
)
309 if (irqd_is_started(&desc
->irq_data
)) {
311 if (desc
->irq_data
.chip
->irq_shutdown
) {
312 desc
->irq_data
.chip
->irq_shutdown(&desc
->irq_data
);
313 irq_state_set_disabled(desc
);
314 irq_state_set_masked(desc
);
316 __irq_disable(desc
, true);
318 irq_state_clr_started(desc
);
323 void irq_shutdown_and_deactivate(struct irq_desc
*desc
)
327 * This must be called even if the interrupt was never started up,
328 * because the activation can happen before the interrupt is
329 * available for request/startup. It has it's own state tracking so
330 * it's safe to call it unconditionally.
332 irq_domain_deactivate_irq(&desc
->irq_data
);
335 void irq_enable(struct irq_desc
*desc
)
337 if (!irqd_irq_disabled(&desc
->irq_data
)) {
340 irq_state_clr_disabled(desc
);
341 if (desc
->irq_data
.chip
->irq_enable
) {
342 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
343 irq_state_clr_masked(desc
);
350 static void __irq_disable(struct irq_desc
*desc
, bool mask
)
352 if (irqd_irq_disabled(&desc
->irq_data
)) {
356 irq_state_set_disabled(desc
);
357 if (desc
->irq_data
.chip
->irq_disable
) {
358 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
359 irq_state_set_masked(desc
);
367 * irq_disable - Mark interrupt disabled
368 * @desc: irq descriptor which should be disabled
370 * If the chip does not implement the irq_disable callback, we
371 * use a lazy disable approach. That means we mark the interrupt
372 * disabled, but leave the hardware unmasked. That's an
373 * optimization because we avoid the hardware access for the
374 * common case where no interrupt happens after we marked it
375 * disabled. If an interrupt happens, then the interrupt flow
376 * handler masks the line at the hardware level and marks it
379 * If the interrupt chip does not implement the irq_disable callback,
380 * a driver can disable the lazy approach for a particular irq line by
381 * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
382 * be used for devices which cannot disable the interrupt at the
383 * device level under certain circumstances and have to use
384 * disable_irq[_nosync] instead.
386 void irq_disable(struct irq_desc
*desc
)
388 __irq_disable(desc
, irq_settings_disable_unlazy(desc
));
391 void irq_percpu_enable(struct irq_desc
*desc
, unsigned int cpu
)
393 if (desc
->irq_data
.chip
->irq_enable
)
394 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
396 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
397 cpumask_set_cpu(cpu
, desc
->percpu_enabled
);
400 void irq_percpu_disable(struct irq_desc
*desc
, unsigned int cpu
)
402 if (desc
->irq_data
.chip
->irq_disable
)
403 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
405 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
406 cpumask_clear_cpu(cpu
, desc
->percpu_enabled
);
409 static inline void mask_ack_irq(struct irq_desc
*desc
)
411 if (desc
->irq_data
.chip
->irq_mask_ack
) {
412 desc
->irq_data
.chip
->irq_mask_ack(&desc
->irq_data
);
413 irq_state_set_masked(desc
);
416 if (desc
->irq_data
.chip
->irq_ack
)
417 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
421 void mask_irq(struct irq_desc
*desc
)
423 if (irqd_irq_masked(&desc
->irq_data
))
426 if (desc
->irq_data
.chip
->irq_mask
) {
427 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
428 irq_state_set_masked(desc
);
432 void unmask_irq(struct irq_desc
*desc
)
434 if (!irqd_irq_masked(&desc
->irq_data
))
437 if (desc
->irq_data
.chip
->irq_unmask
) {
438 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
439 irq_state_clr_masked(desc
);
443 void unmask_threaded_irq(struct irq_desc
*desc
)
445 struct irq_chip
*chip
= desc
->irq_data
.chip
;
447 if (chip
->flags
& IRQCHIP_EOI_THREADED
)
448 chip
->irq_eoi(&desc
->irq_data
);
454 * handle_nested_irq - Handle a nested irq from a irq thread
455 * @irq: the interrupt number
457 * Handle interrupts which are nested into a threaded interrupt
458 * handler. The handler function is called inside the calling
461 void handle_nested_irq(unsigned int irq
)
463 struct irq_desc
*desc
= irq_to_desc(irq
);
464 struct irqaction
*action
;
465 irqreturn_t action_ret
;
469 raw_spin_lock_irq(&desc
->lock
);
471 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
473 action
= desc
->action
;
474 if (unlikely(!action
|| irqd_irq_disabled(&desc
->irq_data
))) {
475 desc
->istate
|= IRQS_PENDING
;
479 kstat_incr_irqs_this_cpu(desc
);
480 irqd_set(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
481 raw_spin_unlock_irq(&desc
->lock
);
483 action_ret
= IRQ_NONE
;
484 for_each_action_of_desc(desc
, action
)
485 action_ret
|= action
->thread_fn(action
->irq
, action
->dev_id
);
487 if (!irq_settings_no_debug(desc
))
488 note_interrupt(desc
, action_ret
);
490 raw_spin_lock_irq(&desc
->lock
);
491 irqd_clear(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
494 raw_spin_unlock_irq(&desc
->lock
);
496 EXPORT_SYMBOL_GPL(handle_nested_irq
);
498 static bool irq_check_poll(struct irq_desc
*desc
)
500 if (!(desc
->istate
& IRQS_POLL_INPROGRESS
))
502 return irq_wait_for_poll(desc
);
505 static bool irq_may_run(struct irq_desc
*desc
)
507 unsigned int mask
= IRQD_IRQ_INPROGRESS
| IRQD_WAKEUP_ARMED
;
510 * If the interrupt is not in progress and is not an armed
511 * wakeup interrupt, proceed.
513 if (!irqd_has_set(&desc
->irq_data
, mask
))
517 * If the interrupt is an armed wakeup source, mark it pending
518 * and suspended, disable it and notify the pm core about the
521 if (irq_pm_check_wakeup(desc
))
525 * Handle a potential concurrent poll on a different core.
527 return irq_check_poll(desc
);
531 * handle_simple_irq - Simple and software-decoded IRQs.
532 * @desc: the interrupt description structure for this irq
534 * Simple interrupts are either sent from a demultiplexing interrupt
535 * handler or come from hardware, where no interrupt hardware control
538 * Note: The caller is expected to handle the ack, clear, mask and
539 * unmask issues if necessary.
541 void handle_simple_irq(struct irq_desc
*desc
)
543 raw_spin_lock(&desc
->lock
);
545 if (!irq_may_run(desc
))
548 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
550 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
551 desc
->istate
|= IRQS_PENDING
;
555 kstat_incr_irqs_this_cpu(desc
);
556 handle_irq_event(desc
);
559 raw_spin_unlock(&desc
->lock
);
561 EXPORT_SYMBOL_GPL(handle_simple_irq
);
564 * handle_untracked_irq - Simple and software-decoded IRQs.
565 * @desc: the interrupt description structure for this irq
567 * Untracked interrupts are sent from a demultiplexing interrupt
568 * handler when the demultiplexer does not know which device it its
569 * multiplexed irq domain generated the interrupt. IRQ's handled
570 * through here are not subjected to stats tracking, randomness, or
571 * spurious interrupt detection.
573 * Note: Like handle_simple_irq, the caller is expected to handle
574 * the ack, clear, mask and unmask issues if necessary.
576 void handle_untracked_irq(struct irq_desc
*desc
)
578 unsigned int flags
= 0;
580 raw_spin_lock(&desc
->lock
);
582 if (!irq_may_run(desc
))
585 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
587 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
588 desc
->istate
|= IRQS_PENDING
;
592 desc
->istate
&= ~IRQS_PENDING
;
593 irqd_set(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
594 raw_spin_unlock(&desc
->lock
);
596 __handle_irq_event_percpu(desc
, &flags
);
598 raw_spin_lock(&desc
->lock
);
599 irqd_clear(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
602 raw_spin_unlock(&desc
->lock
);
604 EXPORT_SYMBOL_GPL(handle_untracked_irq
);
607 * Called unconditionally from handle_level_irq() and only for oneshot
608 * interrupts from handle_fasteoi_irq()
610 static void cond_unmask_irq(struct irq_desc
*desc
)
613 * We need to unmask in the following cases:
614 * - Standard level irq (IRQF_ONESHOT is not set)
615 * - Oneshot irq which did not wake the thread (caused by a
616 * spurious interrupt or a primary handler handling it
619 if (!irqd_irq_disabled(&desc
->irq_data
) &&
620 irqd_irq_masked(&desc
->irq_data
) && !desc
->threads_oneshot
)
625 * handle_level_irq - Level type irq handler
626 * @desc: the interrupt description structure for this irq
628 * Level type interrupts are active as long as the hardware line has
629 * the active level. This may require to mask the interrupt and unmask
630 * it after the associated handler has acknowledged the device, so the
631 * interrupt line is back to inactive.
633 void handle_level_irq(struct irq_desc
*desc
)
635 raw_spin_lock(&desc
->lock
);
638 if (!irq_may_run(desc
))
641 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
644 * If its disabled or no action available
645 * keep it masked and get out of here
647 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
648 desc
->istate
|= IRQS_PENDING
;
652 kstat_incr_irqs_this_cpu(desc
);
653 handle_irq_event(desc
);
655 cond_unmask_irq(desc
);
658 raw_spin_unlock(&desc
->lock
);
660 EXPORT_SYMBOL_GPL(handle_level_irq
);
662 static void cond_unmask_eoi_irq(struct irq_desc
*desc
, struct irq_chip
*chip
)
664 if (!(desc
->istate
& IRQS_ONESHOT
)) {
665 chip
->irq_eoi(&desc
->irq_data
);
669 * We need to unmask in the following cases:
670 * - Oneshot irq which did not wake the thread (caused by a
671 * spurious interrupt or a primary handler handling it
674 if (!irqd_irq_disabled(&desc
->irq_data
) &&
675 irqd_irq_masked(&desc
->irq_data
) && !desc
->threads_oneshot
) {
676 chip
->irq_eoi(&desc
->irq_data
);
678 } else if (!(chip
->flags
& IRQCHIP_EOI_THREADED
)) {
679 chip
->irq_eoi(&desc
->irq_data
);
684 * handle_fasteoi_irq - irq handler for transparent controllers
685 * @desc: the interrupt description structure for this irq
687 * Only a single callback will be issued to the chip: an ->eoi()
688 * call when the interrupt has been serviced. This enables support
689 * for modern forms of interrupt handlers, which handle the flow
690 * details in hardware, transparently.
692 void handle_fasteoi_irq(struct irq_desc
*desc
)
694 struct irq_chip
*chip
= desc
->irq_data
.chip
;
696 raw_spin_lock(&desc
->lock
);
698 if (!irq_may_run(desc
))
701 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
704 * If its disabled or no action available
705 * then mask it and get out of here:
707 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
708 desc
->istate
|= IRQS_PENDING
;
713 kstat_incr_irqs_this_cpu(desc
);
714 if (desc
->istate
& IRQS_ONESHOT
)
717 handle_irq_event(desc
);
719 cond_unmask_eoi_irq(desc
, chip
);
721 raw_spin_unlock(&desc
->lock
);
724 if (!(chip
->flags
& IRQCHIP_EOI_IF_HANDLED
))
725 chip
->irq_eoi(&desc
->irq_data
);
726 raw_spin_unlock(&desc
->lock
);
728 EXPORT_SYMBOL_GPL(handle_fasteoi_irq
);
731 * handle_fasteoi_nmi - irq handler for NMI interrupt lines
732 * @desc: the interrupt description structure for this irq
734 * A simple NMI-safe handler, considering the restrictions
737 * Only a single callback will be issued to the chip: an ->eoi()
738 * call when the interrupt has been serviced. This enables support
739 * for modern forms of interrupt handlers, which handle the flow
740 * details in hardware, transparently.
742 void handle_fasteoi_nmi(struct irq_desc
*desc
)
744 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
745 struct irqaction
*action
= desc
->action
;
746 unsigned int irq
= irq_desc_get_irq(desc
);
749 __kstat_incr_irqs_this_cpu(desc
);
751 trace_irq_handler_entry(irq
, action
);
753 * NMIs cannot be shared, there is only one action.
755 res
= action
->handler(irq
, action
->dev_id
);
756 trace_irq_handler_exit(irq
, action
, res
);
759 chip
->irq_eoi(&desc
->irq_data
);
761 EXPORT_SYMBOL_GPL(handle_fasteoi_nmi
);
764 * handle_edge_irq - edge type IRQ handler
765 * @desc: the interrupt description structure for this irq
767 * Interrupt occurs on the falling and/or rising edge of a hardware
768 * signal. The occurrence is latched into the irq controller hardware
769 * and must be acked in order to be reenabled. After the ack another
770 * interrupt can happen on the same source even before the first one
771 * is handled by the associated event handler. If this happens it
772 * might be necessary to disable (mask) the interrupt depending on the
773 * controller hardware. This requires to reenable the interrupt inside
774 * of the loop which handles the interrupts which have arrived while
775 * the handler was running. If all pending interrupts are handled, the
778 void handle_edge_irq(struct irq_desc
*desc
)
780 raw_spin_lock(&desc
->lock
);
782 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
784 if (!irq_may_run(desc
)) {
785 desc
->istate
|= IRQS_PENDING
;
791 * If its disabled or no action available then mask it and get
794 if (irqd_irq_disabled(&desc
->irq_data
) || !desc
->action
) {
795 desc
->istate
|= IRQS_PENDING
;
800 kstat_incr_irqs_this_cpu(desc
);
802 /* Start handling the irq */
803 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
806 if (unlikely(!desc
->action
)) {
812 * When another irq arrived while we were handling
813 * one, we could have masked the irq.
814 * Reenable it, if it was not disabled in meantime.
816 if (unlikely(desc
->istate
& IRQS_PENDING
)) {
817 if (!irqd_irq_disabled(&desc
->irq_data
) &&
818 irqd_irq_masked(&desc
->irq_data
))
822 handle_irq_event(desc
);
824 } while ((desc
->istate
& IRQS_PENDING
) &&
825 !irqd_irq_disabled(&desc
->irq_data
));
828 raw_spin_unlock(&desc
->lock
);
830 EXPORT_SYMBOL(handle_edge_irq
);
832 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
834 * handle_edge_eoi_irq - edge eoi type IRQ handler
835 * @desc: the interrupt description structure for this irq
837 * Similar as the above handle_edge_irq, but using eoi and w/o the
840 void handle_edge_eoi_irq(struct irq_desc
*desc
)
842 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
844 raw_spin_lock(&desc
->lock
);
846 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
848 if (!irq_may_run(desc
)) {
849 desc
->istate
|= IRQS_PENDING
;
854 * If its disabled or no action available then mask it and get
857 if (irqd_irq_disabled(&desc
->irq_data
) || !desc
->action
) {
858 desc
->istate
|= IRQS_PENDING
;
862 kstat_incr_irqs_this_cpu(desc
);
865 if (unlikely(!desc
->action
))
868 handle_irq_event(desc
);
870 } while ((desc
->istate
& IRQS_PENDING
) &&
871 !irqd_irq_disabled(&desc
->irq_data
));
874 chip
->irq_eoi(&desc
->irq_data
);
875 raw_spin_unlock(&desc
->lock
);
880 * handle_percpu_irq - Per CPU local irq handler
881 * @desc: the interrupt description structure for this irq
883 * Per CPU interrupts on SMP machines without locking requirements
885 void handle_percpu_irq(struct irq_desc
*desc
)
887 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
890 * PER CPU interrupts are not serialized. Do not touch
893 __kstat_incr_irqs_this_cpu(desc
);
896 chip
->irq_ack(&desc
->irq_data
);
898 handle_irq_event_percpu(desc
);
901 chip
->irq_eoi(&desc
->irq_data
);
905 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
906 * @desc: the interrupt description structure for this irq
908 * Per CPU interrupts on SMP machines without locking requirements. Same as
909 * handle_percpu_irq() above but with the following extras:
911 * action->percpu_dev_id is a pointer to percpu variables which
912 * contain the real device id for the cpu on which this handler is
915 void handle_percpu_devid_irq(struct irq_desc
*desc
)
917 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
918 struct irqaction
*action
= desc
->action
;
919 unsigned int irq
= irq_desc_get_irq(desc
);
923 * PER CPU interrupts are not serialized. Do not touch
926 __kstat_incr_irqs_this_cpu(desc
);
929 chip
->irq_ack(&desc
->irq_data
);
931 if (likely(action
)) {
932 trace_irq_handler_entry(irq
, action
);
933 res
= action
->handler(irq
, raw_cpu_ptr(action
->percpu_dev_id
));
934 trace_irq_handler_exit(irq
, action
, res
);
936 unsigned int cpu
= smp_processor_id();
937 bool enabled
= cpumask_test_cpu(cpu
, desc
->percpu_enabled
);
940 irq_percpu_disable(desc
, cpu
);
942 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
943 enabled
? " and unmasked" : "", irq
, cpu
);
947 chip
->irq_eoi(&desc
->irq_data
);
951 * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
953 * @desc: the interrupt description structure for this irq
955 * Similar to handle_fasteoi_nmi, but handling the dev_id cookie
956 * as a percpu pointer.
958 void handle_percpu_devid_fasteoi_nmi(struct irq_desc
*desc
)
960 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
961 struct irqaction
*action
= desc
->action
;
962 unsigned int irq
= irq_desc_get_irq(desc
);
965 __kstat_incr_irqs_this_cpu(desc
);
967 trace_irq_handler_entry(irq
, action
);
968 res
= action
->handler(irq
, raw_cpu_ptr(action
->percpu_dev_id
));
969 trace_irq_handler_exit(irq
, action
, res
);
972 chip
->irq_eoi(&desc
->irq_data
);
976 __irq_do_set_handler(struct irq_desc
*desc
, irq_flow_handler_t handle
,
977 int is_chained
, const char *name
)
980 handle
= handle_bad_irq
;
982 struct irq_data
*irq_data
= &desc
->irq_data
;
983 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
985 * With hierarchical domains we might run into a
986 * situation where the outermost chip is not yet set
987 * up, but the inner chips are there. Instead of
988 * bailing we install the handler, but obviously we
989 * cannot enable/startup the interrupt at this point.
992 if (irq_data
->chip
!= &no_irq_chip
)
995 * Bail out if the outer chip is not set up
996 * and the interrupt supposed to be started
999 if (WARN_ON(is_chained
))
1001 /* Try the parent */
1002 irq_data
= irq_data
->parent_data
;
1005 if (WARN_ON(!irq_data
|| irq_data
->chip
== &no_irq_chip
))
1010 if (handle
== handle_bad_irq
) {
1011 if (desc
->irq_data
.chip
!= &no_irq_chip
)
1013 irq_state_set_disabled(desc
);
1015 desc
->action
= NULL
;
1018 desc
->handle_irq
= handle
;
1021 if (handle
!= handle_bad_irq
&& is_chained
) {
1022 unsigned int type
= irqd_get_trigger_type(&desc
->irq_data
);
1025 * We're about to start this interrupt immediately,
1026 * hence the need to set the trigger configuration.
1027 * But the .set_type callback may have overridden the
1028 * flow handler, ignoring that we're dealing with a
1029 * chained interrupt. Reset it immediately because we
1032 if (type
!= IRQ_TYPE_NONE
) {
1033 __irq_set_trigger(desc
, type
);
1034 desc
->handle_irq
= handle
;
1037 irq_settings_set_noprobe(desc
);
1038 irq_settings_set_norequest(desc
);
1039 irq_settings_set_nothread(desc
);
1040 desc
->action
= &chained_action
;
1041 irq_activate_and_startup(desc
, IRQ_RESEND
);
1046 __irq_set_handler(unsigned int irq
, irq_flow_handler_t handle
, int is_chained
,
1049 unsigned long flags
;
1050 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, 0);
1055 __irq_do_set_handler(desc
, handle
, is_chained
, name
);
1056 irq_put_desc_busunlock(desc
, flags
);
1058 EXPORT_SYMBOL_GPL(__irq_set_handler
);
1061 irq_set_chained_handler_and_data(unsigned int irq
, irq_flow_handler_t handle
,
1064 unsigned long flags
;
1065 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, 0);
1070 desc
->irq_common_data
.handler_data
= data
;
1071 __irq_do_set_handler(desc
, handle
, 1, NULL
);
1073 irq_put_desc_busunlock(desc
, flags
);
1075 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data
);
1078 irq_set_chip_and_handler_name(unsigned int irq
, struct irq_chip
*chip
,
1079 irq_flow_handler_t handle
, const char *name
)
1081 irq_set_chip(irq
, chip
);
1082 __irq_set_handler(irq
, handle
, 0, name
);
1084 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name
);
1086 void irq_modify_status(unsigned int irq
, unsigned long clr
, unsigned long set
)
1088 unsigned long flags
, trigger
, tmp
;
1089 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
1095 * Warn when a driver sets the no autoenable flag on an already
1098 WARN_ON_ONCE(!desc
->depth
&& (set
& _IRQ_NOAUTOEN
));
1100 irq_settings_clr_and_set(desc
, clr
, set
);
1102 trigger
= irqd_get_trigger_type(&desc
->irq_data
);
1104 irqd_clear(&desc
->irq_data
, IRQD_NO_BALANCING
| IRQD_PER_CPU
|
1105 IRQD_TRIGGER_MASK
| IRQD_LEVEL
| IRQD_MOVE_PCNTXT
);
1106 if (irq_settings_has_no_balance_set(desc
))
1107 irqd_set(&desc
->irq_data
, IRQD_NO_BALANCING
);
1108 if (irq_settings_is_per_cpu(desc
))
1109 irqd_set(&desc
->irq_data
, IRQD_PER_CPU
);
1110 if (irq_settings_can_move_pcntxt(desc
))
1111 irqd_set(&desc
->irq_data
, IRQD_MOVE_PCNTXT
);
1112 if (irq_settings_is_level(desc
))
1113 irqd_set(&desc
->irq_data
, IRQD_LEVEL
);
1115 tmp
= irq_settings_get_trigger_mask(desc
);
1116 if (tmp
!= IRQ_TYPE_NONE
)
1119 irqd_set(&desc
->irq_data
, trigger
);
1121 irq_put_desc_unlock(desc
, flags
);
1123 EXPORT_SYMBOL_GPL(irq_modify_status
);
1126 * irq_cpu_online - Invoke all irq_cpu_online functions.
1128 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1131 void irq_cpu_online(void)
1133 struct irq_desc
*desc
;
1134 struct irq_chip
*chip
;
1135 unsigned long flags
;
1138 for_each_active_irq(irq
) {
1139 desc
= irq_to_desc(irq
);
1143 raw_spin_lock_irqsave(&desc
->lock
, flags
);
1145 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
1146 if (chip
&& chip
->irq_cpu_online
&&
1147 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
1148 !irqd_irq_disabled(&desc
->irq_data
)))
1149 chip
->irq_cpu_online(&desc
->irq_data
);
1151 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
1156 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1158 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1161 void irq_cpu_offline(void)
1163 struct irq_desc
*desc
;
1164 struct irq_chip
*chip
;
1165 unsigned long flags
;
1168 for_each_active_irq(irq
) {
1169 desc
= irq_to_desc(irq
);
1173 raw_spin_lock_irqsave(&desc
->lock
, flags
);
1175 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
1176 if (chip
&& chip
->irq_cpu_offline
&&
1177 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
1178 !irqd_irq_disabled(&desc
->irq_data
)))
1179 chip
->irq_cpu_offline(&desc
->irq_data
);
1181 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
1185 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1187 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1189 * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1190 * stacked on transparent controllers
1192 * @desc: the interrupt description structure for this irq
1194 * Like handle_fasteoi_irq(), but for use with hierarchy where
1195 * the irq_chip also needs to have its ->irq_ack() function
1198 void handle_fasteoi_ack_irq(struct irq_desc
*desc
)
1200 struct irq_chip
*chip
= desc
->irq_data
.chip
;
1202 raw_spin_lock(&desc
->lock
);
1204 if (!irq_may_run(desc
))
1207 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
1210 * If its disabled or no action available
1211 * then mask it and get out of here:
1213 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
1214 desc
->istate
|= IRQS_PENDING
;
1219 kstat_incr_irqs_this_cpu(desc
);
1220 if (desc
->istate
& IRQS_ONESHOT
)
1223 /* Start handling the irq */
1224 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
1226 handle_irq_event(desc
);
1228 cond_unmask_eoi_irq(desc
, chip
);
1230 raw_spin_unlock(&desc
->lock
);
1233 if (!(chip
->flags
& IRQCHIP_EOI_IF_HANDLED
))
1234 chip
->irq_eoi(&desc
->irq_data
);
1235 raw_spin_unlock(&desc
->lock
);
1237 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq
);
1240 * handle_fasteoi_mask_irq - irq handler for level hierarchy
1241 * stacked on transparent controllers
1243 * @desc: the interrupt description structure for this irq
1245 * Like handle_fasteoi_irq(), but for use with hierarchy where
1246 * the irq_chip also needs to have its ->irq_mask_ack() function
1249 void handle_fasteoi_mask_irq(struct irq_desc
*desc
)
1251 struct irq_chip
*chip
= desc
->irq_data
.chip
;
1253 raw_spin_lock(&desc
->lock
);
1256 if (!irq_may_run(desc
))
1259 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
1262 * If its disabled or no action available
1263 * then mask it and get out of here:
1265 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
1266 desc
->istate
|= IRQS_PENDING
;
1271 kstat_incr_irqs_this_cpu(desc
);
1272 if (desc
->istate
& IRQS_ONESHOT
)
1275 handle_irq_event(desc
);
1277 cond_unmask_eoi_irq(desc
, chip
);
1279 raw_spin_unlock(&desc
->lock
);
1282 if (!(chip
->flags
& IRQCHIP_EOI_IF_HANDLED
))
1283 chip
->irq_eoi(&desc
->irq_data
);
1284 raw_spin_unlock(&desc
->lock
);
1286 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq
);
1288 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1291 * irq_chip_set_parent_state - set the state of a parent interrupt.
1293 * @data: Pointer to interrupt specific data
1294 * @which: State to be restored (one of IRQCHIP_STATE_*)
1295 * @val: Value corresponding to @which
1297 * Conditional success, if the underlying irqchip does not implement it.
1299 int irq_chip_set_parent_state(struct irq_data
*data
,
1300 enum irqchip_irq_state which
,
1303 data
= data
->parent_data
;
1305 if (!data
|| !data
->chip
->irq_set_irqchip_state
)
1308 return data
->chip
->irq_set_irqchip_state(data
, which
, val
);
1310 EXPORT_SYMBOL_GPL(irq_chip_set_parent_state
);
1313 * irq_chip_get_parent_state - get the state of a parent interrupt.
1315 * @data: Pointer to interrupt specific data
1316 * @which: one of IRQCHIP_STATE_* the caller wants to know
1317 * @state: a pointer to a boolean where the state is to be stored
1319 * Conditional success, if the underlying irqchip does not implement it.
1321 int irq_chip_get_parent_state(struct irq_data
*data
,
1322 enum irqchip_irq_state which
,
1325 data
= data
->parent_data
;
1327 if (!data
|| !data
->chip
->irq_get_irqchip_state
)
1330 return data
->chip
->irq_get_irqchip_state(data
, which
, state
);
1332 EXPORT_SYMBOL_GPL(irq_chip_get_parent_state
);
1335 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1337 * @data: Pointer to interrupt specific data
1339 void irq_chip_enable_parent(struct irq_data
*data
)
1341 data
= data
->parent_data
;
1342 if (data
->chip
->irq_enable
)
1343 data
->chip
->irq_enable(data
);
1345 data
->chip
->irq_unmask(data
);
1347 EXPORT_SYMBOL_GPL(irq_chip_enable_parent
);
1350 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1352 * @data: Pointer to interrupt specific data
1354 void irq_chip_disable_parent(struct irq_data
*data
)
1356 data
= data
->parent_data
;
1357 if (data
->chip
->irq_disable
)
1358 data
->chip
->irq_disable(data
);
1360 data
->chip
->irq_mask(data
);
1362 EXPORT_SYMBOL_GPL(irq_chip_disable_parent
);
1365 * irq_chip_ack_parent - Acknowledge the parent interrupt
1366 * @data: Pointer to interrupt specific data
1368 void irq_chip_ack_parent(struct irq_data
*data
)
1370 data
= data
->parent_data
;
1371 data
->chip
->irq_ack(data
);
1373 EXPORT_SYMBOL_GPL(irq_chip_ack_parent
);
1376 * irq_chip_mask_parent - Mask the parent interrupt
1377 * @data: Pointer to interrupt specific data
1379 void irq_chip_mask_parent(struct irq_data
*data
)
1381 data
= data
->parent_data
;
1382 data
->chip
->irq_mask(data
);
1384 EXPORT_SYMBOL_GPL(irq_chip_mask_parent
);
1387 * irq_chip_mask_ack_parent - Mask and acknowledge the parent interrupt
1388 * @data: Pointer to interrupt specific data
1390 void irq_chip_mask_ack_parent(struct irq_data
*data
)
1392 data
= data
->parent_data
;
1393 data
->chip
->irq_mask_ack(data
);
1395 EXPORT_SYMBOL_GPL(irq_chip_mask_ack_parent
);
1398 * irq_chip_unmask_parent - Unmask the parent interrupt
1399 * @data: Pointer to interrupt specific data
1401 void irq_chip_unmask_parent(struct irq_data
*data
)
1403 data
= data
->parent_data
;
1404 data
->chip
->irq_unmask(data
);
1406 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent
);
1409 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1410 * @data: Pointer to interrupt specific data
1412 void irq_chip_eoi_parent(struct irq_data
*data
)
1414 data
= data
->parent_data
;
1415 data
->chip
->irq_eoi(data
);
1417 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent
);
1420 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1421 * @data: Pointer to interrupt specific data
1422 * @dest: The affinity mask to set
1423 * @force: Flag to enforce setting (disable online checks)
1425 * Conditional, as the underlying parent chip might not implement it.
1427 int irq_chip_set_affinity_parent(struct irq_data
*data
,
1428 const struct cpumask
*dest
, bool force
)
1430 data
= data
->parent_data
;
1431 if (data
->chip
->irq_set_affinity
)
1432 return data
->chip
->irq_set_affinity(data
, dest
, force
);
1436 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent
);
1439 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1440 * @data: Pointer to interrupt specific data
1441 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1443 * Conditional, as the underlying parent chip might not implement it.
1445 int irq_chip_set_type_parent(struct irq_data
*data
, unsigned int type
)
1447 data
= data
->parent_data
;
1449 if (data
->chip
->irq_set_type
)
1450 return data
->chip
->irq_set_type(data
, type
);
1454 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent
);
1457 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1458 * @data: Pointer to interrupt specific data
1460 * Iterate through the domain hierarchy of the interrupt and check
1461 * whether a hw retrigger function exists. If yes, invoke it.
1463 int irq_chip_retrigger_hierarchy(struct irq_data
*data
)
1465 for (data
= data
->parent_data
; data
; data
= data
->parent_data
)
1466 if (data
->chip
&& data
->chip
->irq_retrigger
)
1467 return data
->chip
->irq_retrigger(data
);
1471 EXPORT_SYMBOL_GPL(irq_chip_retrigger_hierarchy
);
1474 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1475 * @data: Pointer to interrupt specific data
1476 * @vcpu_info: The vcpu affinity information
1478 int irq_chip_set_vcpu_affinity_parent(struct irq_data
*data
, void *vcpu_info
)
1480 data
= data
->parent_data
;
1481 if (data
->chip
->irq_set_vcpu_affinity
)
1482 return data
->chip
->irq_set_vcpu_affinity(data
, vcpu_info
);
1486 EXPORT_SYMBOL_GPL(irq_chip_set_vcpu_affinity_parent
);
1488 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1489 * @data: Pointer to interrupt specific data
1490 * @on: Whether to set or reset the wake-up capability of this irq
1492 * Conditional, as the underlying parent chip might not implement it.
1494 int irq_chip_set_wake_parent(struct irq_data
*data
, unsigned int on
)
1496 data
= data
->parent_data
;
1498 if (data
->chip
->flags
& IRQCHIP_SKIP_SET_WAKE
)
1501 if (data
->chip
->irq_set_wake
)
1502 return data
->chip
->irq_set_wake(data
, on
);
1506 EXPORT_SYMBOL_GPL(irq_chip_set_wake_parent
);
1509 * irq_chip_request_resources_parent - Request resources on the parent interrupt
1510 * @data: Pointer to interrupt specific data
1512 int irq_chip_request_resources_parent(struct irq_data
*data
)
1514 data
= data
->parent_data
;
1516 if (data
->chip
->irq_request_resources
)
1517 return data
->chip
->irq_request_resources(data
);
1521 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent
);
1524 * irq_chip_release_resources_parent - Release resources on the parent interrupt
1525 * @data: Pointer to interrupt specific data
1527 void irq_chip_release_resources_parent(struct irq_data
*data
)
1529 data
= data
->parent_data
;
1530 if (data
->chip
->irq_release_resources
)
1531 data
->chip
->irq_release_resources(data
);
1533 EXPORT_SYMBOL_GPL(irq_chip_release_resources_parent
);
1537 * irq_chip_compose_msi_msg - Compose msi message for a irq chip
1538 * @data: Pointer to interrupt specific data
1539 * @msg: Pointer to the MSI message
1541 * For hierarchical domains we find the first chip in the hierarchy
1542 * which implements the irq_compose_msi_msg callback. For non
1543 * hierarchical we use the top level chip.
1545 int irq_chip_compose_msi_msg(struct irq_data
*data
, struct msi_msg
*msg
)
1547 struct irq_data
*pos
;
1549 for (pos
= NULL
; !pos
&& data
; data
= irqd_get_parent_data(data
)) {
1550 if (data
->chip
&& data
->chip
->irq_compose_msi_msg
)
1557 pos
->chip
->irq_compose_msi_msg(pos
, msg
);
1562 * irq_chip_pm_get - Enable power for an IRQ chip
1563 * @data: Pointer to interrupt specific data
1565 * Enable the power to the IRQ chip referenced by the interrupt data
1568 int irq_chip_pm_get(struct irq_data
*data
)
1572 if (IS_ENABLED(CONFIG_PM
) && data
->chip
->parent_device
) {
1573 retval
= pm_runtime_get_sync(data
->chip
->parent_device
);
1575 pm_runtime_put_noidle(data
->chip
->parent_device
);
1584 * irq_chip_pm_put - Disable power for an IRQ chip
1585 * @data: Pointer to interrupt specific data
1587 * Disable the power to the IRQ chip referenced by the interrupt data
1588 * structure, belongs. Note that power will only be disabled, once this
1589 * function has been called for all IRQs that have called irq_chip_pm_get().
1591 int irq_chip_pm_put(struct irq_data
*data
)
1595 if (IS_ENABLED(CONFIG_PM
) && data
->chip
->parent_device
)
1596 retval
= pm_runtime_put(data
->chip
->parent_device
);
1598 return (retval
< 0) ? retval
: 0;