2 * linux/kernel/irq/chip.c
4 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
5 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
7 * This file contains the core interrupt handling code, for irq-chip
10 * Detailed information is available in Documentation/DocBook/genericirq
13 #include <linux/irq.h>
14 #include <linux/msi.h>
15 #include <linux/module.h>
16 #include <linux/interrupt.h>
17 #include <linux/kernel_stat.h>
18 #include <linux/irqdomain.h>
20 #include <trace/events/irq.h>
22 #include "internals.h"
24 static irqreturn_t
bad_chained_irq(int irq
, void *dev_id
)
26 WARN_ONCE(1, "Chained irq %d should not call an action\n", irq
);
31 * Chained handlers should never call action on their IRQ. This default
32 * action will emit warning if such thing happens.
34 struct irqaction chained_action
= {
35 .handler
= bad_chained_irq
,
39 * irq_set_chip - set the irq chip for an irq
41 * @chip: pointer to irq chip description structure
43 int irq_set_chip(unsigned int irq
, struct irq_chip
*chip
)
46 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
54 desc
->irq_data
.chip
= chip
;
55 irq_put_desc_unlock(desc
, flags
);
57 * For !CONFIG_SPARSE_IRQ make the irq show up in
63 EXPORT_SYMBOL(irq_set_chip
);
66 * irq_set_type - set the irq trigger type for an irq
68 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
70 int irq_set_irq_type(unsigned int irq
, unsigned int type
)
73 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, IRQ_GET_DESC_CHECK_GLOBAL
);
79 ret
= __irq_set_trigger(desc
, type
);
80 irq_put_desc_busunlock(desc
, flags
);
83 EXPORT_SYMBOL(irq_set_irq_type
);
86 * irq_set_handler_data - set irq handler data for an irq
87 * @irq: Interrupt number
88 * @data: Pointer to interrupt specific data
90 * Set the hardware irq controller data for an irq
92 int irq_set_handler_data(unsigned int irq
, void *data
)
95 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
99 desc
->irq_common_data
.handler_data
= data
;
100 irq_put_desc_unlock(desc
, flags
);
103 EXPORT_SYMBOL(irq_set_handler_data
);
106 * irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
107 * @irq_base: Interrupt number base
108 * @irq_offset: Interrupt number offset
109 * @entry: Pointer to MSI descriptor data
111 * Set the MSI descriptor entry for an irq at offset
113 int irq_set_msi_desc_off(unsigned int irq_base
, unsigned int irq_offset
,
114 struct msi_desc
*entry
)
117 struct irq_desc
*desc
= irq_get_desc_lock(irq_base
+ irq_offset
, &flags
, IRQ_GET_DESC_CHECK_GLOBAL
);
121 desc
->irq_common_data
.msi_desc
= entry
;
122 if (entry
&& !irq_offset
)
123 entry
->irq
= irq_base
;
124 irq_put_desc_unlock(desc
, flags
);
129 * irq_set_msi_desc - set MSI descriptor data for an irq
130 * @irq: Interrupt number
131 * @entry: Pointer to MSI descriptor data
133 * Set the MSI descriptor entry for an irq
135 int irq_set_msi_desc(unsigned int irq
, struct msi_desc
*entry
)
137 return irq_set_msi_desc_off(irq
, 0, entry
);
141 * irq_set_chip_data - set irq chip data for an irq
142 * @irq: Interrupt number
143 * @data: Pointer to chip specific data
145 * Set the hardware irq chip data for an irq
147 int irq_set_chip_data(unsigned int irq
, void *data
)
150 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
154 desc
->irq_data
.chip_data
= data
;
155 irq_put_desc_unlock(desc
, flags
);
158 EXPORT_SYMBOL(irq_set_chip_data
);
160 struct irq_data
*irq_get_irq_data(unsigned int irq
)
162 struct irq_desc
*desc
= irq_to_desc(irq
);
164 return desc
? &desc
->irq_data
: NULL
;
166 EXPORT_SYMBOL_GPL(irq_get_irq_data
);
168 static void irq_state_clr_disabled(struct irq_desc
*desc
)
170 irqd_clear(&desc
->irq_data
, IRQD_IRQ_DISABLED
);
173 static void irq_state_set_disabled(struct irq_desc
*desc
)
175 irqd_set(&desc
->irq_data
, IRQD_IRQ_DISABLED
);
178 static void irq_state_clr_masked(struct irq_desc
*desc
)
180 irqd_clear(&desc
->irq_data
, IRQD_IRQ_MASKED
);
183 static void irq_state_set_masked(struct irq_desc
*desc
)
185 irqd_set(&desc
->irq_data
, IRQD_IRQ_MASKED
);
188 int irq_startup(struct irq_desc
*desc
, bool resend
)
192 irq_state_clr_disabled(desc
);
195 irq_domain_activate_irq(&desc
->irq_data
);
196 if (desc
->irq_data
.chip
->irq_startup
) {
197 ret
= desc
->irq_data
.chip
->irq_startup(&desc
->irq_data
);
198 irq_state_clr_masked(desc
);
203 check_irq_resend(desc
);
207 void irq_shutdown(struct irq_desc
*desc
)
209 irq_state_set_disabled(desc
);
211 if (desc
->irq_data
.chip
->irq_shutdown
)
212 desc
->irq_data
.chip
->irq_shutdown(&desc
->irq_data
);
213 else if (desc
->irq_data
.chip
->irq_disable
)
214 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
216 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
217 irq_domain_deactivate_irq(&desc
->irq_data
);
218 irq_state_set_masked(desc
);
221 void irq_enable(struct irq_desc
*desc
)
223 irq_state_clr_disabled(desc
);
224 if (desc
->irq_data
.chip
->irq_enable
)
225 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
227 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
228 irq_state_clr_masked(desc
);
232 * irq_disable - Mark interrupt disabled
233 * @desc: irq descriptor which should be disabled
235 * If the chip does not implement the irq_disable callback, we
236 * use a lazy disable approach. That means we mark the interrupt
237 * disabled, but leave the hardware unmasked. That's an
238 * optimization because we avoid the hardware access for the
239 * common case where no interrupt happens after we marked it
240 * disabled. If an interrupt happens, then the interrupt flow
241 * handler masks the line at the hardware level and marks it
244 * If the interrupt chip does not implement the irq_disable callback,
245 * a driver can disable the lazy approach for a particular irq line by
246 * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
247 * be used for devices which cannot disable the interrupt at the
248 * device level under certain circumstances and have to use
249 * disable_irq[_nosync] instead.
251 void irq_disable(struct irq_desc
*desc
)
253 irq_state_set_disabled(desc
);
254 if (desc
->irq_data
.chip
->irq_disable
) {
255 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
256 irq_state_set_masked(desc
);
257 } else if (irq_settings_disable_unlazy(desc
)) {
262 void irq_percpu_enable(struct irq_desc
*desc
, unsigned int cpu
)
264 if (desc
->irq_data
.chip
->irq_enable
)
265 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
267 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
268 cpumask_set_cpu(cpu
, desc
->percpu_enabled
);
271 void irq_percpu_disable(struct irq_desc
*desc
, unsigned int cpu
)
273 if (desc
->irq_data
.chip
->irq_disable
)
274 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
276 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
277 cpumask_clear_cpu(cpu
, desc
->percpu_enabled
);
280 static inline void mask_ack_irq(struct irq_desc
*desc
)
282 if (desc
->irq_data
.chip
->irq_mask_ack
)
283 desc
->irq_data
.chip
->irq_mask_ack(&desc
->irq_data
);
285 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
286 if (desc
->irq_data
.chip
->irq_ack
)
287 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
289 irq_state_set_masked(desc
);
292 void mask_irq(struct irq_desc
*desc
)
294 if (desc
->irq_data
.chip
->irq_mask
) {
295 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
296 irq_state_set_masked(desc
);
300 void unmask_irq(struct irq_desc
*desc
)
302 if (desc
->irq_data
.chip
->irq_unmask
) {
303 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
304 irq_state_clr_masked(desc
);
308 void unmask_threaded_irq(struct irq_desc
*desc
)
310 struct irq_chip
*chip
= desc
->irq_data
.chip
;
312 if (chip
->flags
& IRQCHIP_EOI_THREADED
)
313 chip
->irq_eoi(&desc
->irq_data
);
315 if (chip
->irq_unmask
) {
316 chip
->irq_unmask(&desc
->irq_data
);
317 irq_state_clr_masked(desc
);
322 * handle_nested_irq - Handle a nested irq from a irq thread
323 * @irq: the interrupt number
325 * Handle interrupts which are nested into a threaded interrupt
326 * handler. The handler function is called inside the calling
329 void handle_nested_irq(unsigned int irq
)
331 struct irq_desc
*desc
= irq_to_desc(irq
);
332 struct irqaction
*action
;
333 irqreturn_t action_ret
;
337 raw_spin_lock_irq(&desc
->lock
);
339 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
341 action
= desc
->action
;
342 if (unlikely(!action
|| irqd_irq_disabled(&desc
->irq_data
))) {
343 desc
->istate
|= IRQS_PENDING
;
347 kstat_incr_irqs_this_cpu(desc
);
348 irqd_set(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
349 raw_spin_unlock_irq(&desc
->lock
);
351 action_ret
= IRQ_NONE
;
352 for_each_action_of_desc(desc
, action
)
353 action_ret
|= action
->thread_fn(action
->irq
, action
->dev_id
);
356 note_interrupt(desc
, action_ret
);
358 raw_spin_lock_irq(&desc
->lock
);
359 irqd_clear(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
362 raw_spin_unlock_irq(&desc
->lock
);
364 EXPORT_SYMBOL_GPL(handle_nested_irq
);
366 static bool irq_check_poll(struct irq_desc
*desc
)
368 if (!(desc
->istate
& IRQS_POLL_INPROGRESS
))
370 return irq_wait_for_poll(desc
);
373 static bool irq_may_run(struct irq_desc
*desc
)
375 unsigned int mask
= IRQD_IRQ_INPROGRESS
| IRQD_WAKEUP_ARMED
;
378 * If the interrupt is not in progress and is not an armed
379 * wakeup interrupt, proceed.
381 if (!irqd_has_set(&desc
->irq_data
, mask
))
385 * If the interrupt is an armed wakeup source, mark it pending
386 * and suspended, disable it and notify the pm core about the
389 if (irq_pm_check_wakeup(desc
))
393 * Handle a potential concurrent poll on a different core.
395 return irq_check_poll(desc
);
399 * handle_simple_irq - Simple and software-decoded IRQs.
400 * @desc: the interrupt description structure for this irq
402 * Simple interrupts are either sent from a demultiplexing interrupt
403 * handler or come from hardware, where no interrupt hardware control
406 * Note: The caller is expected to handle the ack, clear, mask and
407 * unmask issues if necessary.
409 void handle_simple_irq(struct irq_desc
*desc
)
411 raw_spin_lock(&desc
->lock
);
413 if (!irq_may_run(desc
))
416 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
418 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
419 desc
->istate
|= IRQS_PENDING
;
423 kstat_incr_irqs_this_cpu(desc
);
424 handle_irq_event(desc
);
427 raw_spin_unlock(&desc
->lock
);
429 EXPORT_SYMBOL_GPL(handle_simple_irq
);
432 * handle_untracked_irq - Simple and software-decoded IRQs.
433 * @desc: the interrupt description structure for this irq
435 * Untracked interrupts are sent from a demultiplexing interrupt
436 * handler when the demultiplexer does not know which device it its
437 * multiplexed irq domain generated the interrupt. IRQ's handled
438 * through here are not subjected to stats tracking, randomness, or
439 * spurious interrupt detection.
441 * Note: Like handle_simple_irq, the caller is expected to handle
442 * the ack, clear, mask and unmask issues if necessary.
444 void handle_untracked_irq(struct irq_desc
*desc
)
446 unsigned int flags
= 0;
448 raw_spin_lock(&desc
->lock
);
450 if (!irq_may_run(desc
))
453 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
455 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
456 desc
->istate
|= IRQS_PENDING
;
460 desc
->istate
&= ~IRQS_PENDING
;
461 irqd_set(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
462 raw_spin_unlock(&desc
->lock
);
464 __handle_irq_event_percpu(desc
, &flags
);
466 raw_spin_lock(&desc
->lock
);
467 irqd_clear(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
470 raw_spin_unlock(&desc
->lock
);
472 EXPORT_SYMBOL_GPL(handle_untracked_irq
);
475 * Called unconditionally from handle_level_irq() and only for oneshot
476 * interrupts from handle_fasteoi_irq()
478 static void cond_unmask_irq(struct irq_desc
*desc
)
481 * We need to unmask in the following cases:
482 * - Standard level irq (IRQF_ONESHOT is not set)
483 * - Oneshot irq which did not wake the thread (caused by a
484 * spurious interrupt or a primary handler handling it
487 if (!irqd_irq_disabled(&desc
->irq_data
) &&
488 irqd_irq_masked(&desc
->irq_data
) && !desc
->threads_oneshot
)
493 * handle_level_irq - Level type irq handler
494 * @desc: the interrupt description structure for this irq
496 * Level type interrupts are active as long as the hardware line has
497 * the active level. This may require to mask the interrupt and unmask
498 * it after the associated handler has acknowledged the device, so the
499 * interrupt line is back to inactive.
501 void handle_level_irq(struct irq_desc
*desc
)
503 raw_spin_lock(&desc
->lock
);
506 if (!irq_may_run(desc
))
509 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
512 * If its disabled or no action available
513 * keep it masked and get out of here
515 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
516 desc
->istate
|= IRQS_PENDING
;
520 kstat_incr_irqs_this_cpu(desc
);
521 handle_irq_event(desc
);
523 cond_unmask_irq(desc
);
526 raw_spin_unlock(&desc
->lock
);
528 EXPORT_SYMBOL_GPL(handle_level_irq
);
530 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
531 static inline void preflow_handler(struct irq_desc
*desc
)
533 if (desc
->preflow_handler
)
534 desc
->preflow_handler(&desc
->irq_data
);
537 static inline void preflow_handler(struct irq_desc
*desc
) { }
540 static void cond_unmask_eoi_irq(struct irq_desc
*desc
, struct irq_chip
*chip
)
542 if (!(desc
->istate
& IRQS_ONESHOT
)) {
543 chip
->irq_eoi(&desc
->irq_data
);
547 * We need to unmask in the following cases:
548 * - Oneshot irq which did not wake the thread (caused by a
549 * spurious interrupt or a primary handler handling it
552 if (!irqd_irq_disabled(&desc
->irq_data
) &&
553 irqd_irq_masked(&desc
->irq_data
) && !desc
->threads_oneshot
) {
554 chip
->irq_eoi(&desc
->irq_data
);
556 } else if (!(chip
->flags
& IRQCHIP_EOI_THREADED
)) {
557 chip
->irq_eoi(&desc
->irq_data
);
562 * handle_fasteoi_irq - irq handler for transparent controllers
563 * @desc: the interrupt description structure for this irq
565 * Only a single callback will be issued to the chip: an ->eoi()
566 * call when the interrupt has been serviced. This enables support
567 * for modern forms of interrupt handlers, which handle the flow
568 * details in hardware, transparently.
570 void handle_fasteoi_irq(struct irq_desc
*desc
)
572 struct irq_chip
*chip
= desc
->irq_data
.chip
;
574 raw_spin_lock(&desc
->lock
);
576 if (!irq_may_run(desc
))
579 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
582 * If its disabled or no action available
583 * then mask it and get out of here:
585 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
586 desc
->istate
|= IRQS_PENDING
;
591 kstat_incr_irqs_this_cpu(desc
);
592 if (desc
->istate
& IRQS_ONESHOT
)
595 preflow_handler(desc
);
596 handle_irq_event(desc
);
598 cond_unmask_eoi_irq(desc
, chip
);
600 raw_spin_unlock(&desc
->lock
);
603 if (!(chip
->flags
& IRQCHIP_EOI_IF_HANDLED
))
604 chip
->irq_eoi(&desc
->irq_data
);
605 raw_spin_unlock(&desc
->lock
);
607 EXPORT_SYMBOL_GPL(handle_fasteoi_irq
);
610 * handle_edge_irq - edge type IRQ handler
611 * @desc: the interrupt description structure for this irq
613 * Interrupt occures on the falling and/or rising edge of a hardware
614 * signal. The occurrence is latched into the irq controller hardware
615 * and must be acked in order to be reenabled. After the ack another
616 * interrupt can happen on the same source even before the first one
617 * is handled by the associated event handler. If this happens it
618 * might be necessary to disable (mask) the interrupt depending on the
619 * controller hardware. This requires to reenable the interrupt inside
620 * of the loop which handles the interrupts which have arrived while
621 * the handler was running. If all pending interrupts are handled, the
624 void handle_edge_irq(struct irq_desc
*desc
)
626 raw_spin_lock(&desc
->lock
);
628 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
630 if (!irq_may_run(desc
)) {
631 desc
->istate
|= IRQS_PENDING
;
637 * If its disabled or no action available then mask it and get
640 if (irqd_irq_disabled(&desc
->irq_data
) || !desc
->action
) {
641 desc
->istate
|= IRQS_PENDING
;
646 kstat_incr_irqs_this_cpu(desc
);
648 /* Start handling the irq */
649 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
652 if (unlikely(!desc
->action
)) {
658 * When another irq arrived while we were handling
659 * one, we could have masked the irq.
660 * Renable it, if it was not disabled in meantime.
662 if (unlikely(desc
->istate
& IRQS_PENDING
)) {
663 if (!irqd_irq_disabled(&desc
->irq_data
) &&
664 irqd_irq_masked(&desc
->irq_data
))
668 handle_irq_event(desc
);
670 } while ((desc
->istate
& IRQS_PENDING
) &&
671 !irqd_irq_disabled(&desc
->irq_data
));
674 raw_spin_unlock(&desc
->lock
);
676 EXPORT_SYMBOL(handle_edge_irq
);
678 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
680 * handle_edge_eoi_irq - edge eoi type IRQ handler
681 * @desc: the interrupt description structure for this irq
683 * Similar as the above handle_edge_irq, but using eoi and w/o the
686 void handle_edge_eoi_irq(struct irq_desc
*desc
)
688 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
690 raw_spin_lock(&desc
->lock
);
692 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
694 if (!irq_may_run(desc
)) {
695 desc
->istate
|= IRQS_PENDING
;
700 * If its disabled or no action available then mask it and get
703 if (irqd_irq_disabled(&desc
->irq_data
) || !desc
->action
) {
704 desc
->istate
|= IRQS_PENDING
;
708 kstat_incr_irqs_this_cpu(desc
);
711 if (unlikely(!desc
->action
))
714 handle_irq_event(desc
);
716 } while ((desc
->istate
& IRQS_PENDING
) &&
717 !irqd_irq_disabled(&desc
->irq_data
));
720 chip
->irq_eoi(&desc
->irq_data
);
721 raw_spin_unlock(&desc
->lock
);
726 * handle_percpu_irq - Per CPU local irq handler
727 * @desc: the interrupt description structure for this irq
729 * Per CPU interrupts on SMP machines without locking requirements
731 void handle_percpu_irq(struct irq_desc
*desc
)
733 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
735 kstat_incr_irqs_this_cpu(desc
);
738 chip
->irq_ack(&desc
->irq_data
);
740 handle_irq_event_percpu(desc
);
743 chip
->irq_eoi(&desc
->irq_data
);
747 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
748 * @desc: the interrupt description structure for this irq
750 * Per CPU interrupts on SMP machines without locking requirements. Same as
751 * handle_percpu_irq() above but with the following extras:
753 * action->percpu_dev_id is a pointer to percpu variables which
754 * contain the real device id for the cpu on which this handler is
757 void handle_percpu_devid_irq(struct irq_desc
*desc
)
759 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
760 struct irqaction
*action
= desc
->action
;
761 unsigned int irq
= irq_desc_get_irq(desc
);
764 kstat_incr_irqs_this_cpu(desc
);
767 chip
->irq_ack(&desc
->irq_data
);
769 if (likely(action
)) {
770 trace_irq_handler_entry(irq
, action
);
771 res
= action
->handler(irq
, raw_cpu_ptr(action
->percpu_dev_id
));
772 trace_irq_handler_exit(irq
, action
, res
);
774 unsigned int cpu
= smp_processor_id();
775 bool enabled
= cpumask_test_cpu(cpu
, desc
->percpu_enabled
);
778 irq_percpu_disable(desc
, cpu
);
780 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
781 enabled
? " and unmasked" : "", irq
, cpu
);
785 chip
->irq_eoi(&desc
->irq_data
);
789 __irq_do_set_handler(struct irq_desc
*desc
, irq_flow_handler_t handle
,
790 int is_chained
, const char *name
)
793 handle
= handle_bad_irq
;
795 struct irq_data
*irq_data
= &desc
->irq_data
;
796 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
798 * With hierarchical domains we might run into a
799 * situation where the outermost chip is not yet set
800 * up, but the inner chips are there. Instead of
801 * bailing we install the handler, but obviously we
802 * cannot enable/startup the interrupt at this point.
805 if (irq_data
->chip
!= &no_irq_chip
)
808 * Bail out if the outer chip is not set up
809 * and the interrrupt supposed to be started
812 if (WARN_ON(is_chained
))
815 irq_data
= irq_data
->parent_data
;
818 if (WARN_ON(!irq_data
|| irq_data
->chip
== &no_irq_chip
))
823 if (handle
== handle_bad_irq
) {
824 if (desc
->irq_data
.chip
!= &no_irq_chip
)
826 irq_state_set_disabled(desc
);
831 desc
->handle_irq
= handle
;
834 if (handle
!= handle_bad_irq
&& is_chained
) {
835 unsigned int type
= irqd_get_trigger_type(&desc
->irq_data
);
838 * We're about to start this interrupt immediately,
839 * hence the need to set the trigger configuration.
840 * But the .set_type callback may have overridden the
841 * flow handler, ignoring that we're dealing with a
842 * chained interrupt. Reset it immediately because we
845 if (type
!= IRQ_TYPE_NONE
) {
846 __irq_set_trigger(desc
, type
);
847 desc
->handle_irq
= handle
;
850 irq_settings_set_noprobe(desc
);
851 irq_settings_set_norequest(desc
);
852 irq_settings_set_nothread(desc
);
853 desc
->action
= &chained_action
;
854 irq_startup(desc
, true);
859 __irq_set_handler(unsigned int irq
, irq_flow_handler_t handle
, int is_chained
,
863 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, 0);
868 __irq_do_set_handler(desc
, handle
, is_chained
, name
);
869 irq_put_desc_busunlock(desc
, flags
);
871 EXPORT_SYMBOL_GPL(__irq_set_handler
);
874 irq_set_chained_handler_and_data(unsigned int irq
, irq_flow_handler_t handle
,
878 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, 0);
883 __irq_do_set_handler(desc
, handle
, 1, NULL
);
884 desc
->irq_common_data
.handler_data
= data
;
886 irq_put_desc_busunlock(desc
, flags
);
888 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data
);
891 irq_set_chip_and_handler_name(unsigned int irq
, struct irq_chip
*chip
,
892 irq_flow_handler_t handle
, const char *name
)
894 irq_set_chip(irq
, chip
);
895 __irq_set_handler(irq
, handle
, 0, name
);
897 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name
);
899 void irq_modify_status(unsigned int irq
, unsigned long clr
, unsigned long set
)
902 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
906 irq_settings_clr_and_set(desc
, clr
, set
);
908 irqd_clear(&desc
->irq_data
, IRQD_NO_BALANCING
| IRQD_PER_CPU
|
909 IRQD_TRIGGER_MASK
| IRQD_LEVEL
| IRQD_MOVE_PCNTXT
);
910 if (irq_settings_has_no_balance_set(desc
))
911 irqd_set(&desc
->irq_data
, IRQD_NO_BALANCING
);
912 if (irq_settings_is_per_cpu(desc
))
913 irqd_set(&desc
->irq_data
, IRQD_PER_CPU
);
914 if (irq_settings_can_move_pcntxt(desc
))
915 irqd_set(&desc
->irq_data
, IRQD_MOVE_PCNTXT
);
916 if (irq_settings_is_level(desc
))
917 irqd_set(&desc
->irq_data
, IRQD_LEVEL
);
919 irqd_set(&desc
->irq_data
, irq_settings_get_trigger_mask(desc
));
921 irq_put_desc_unlock(desc
, flags
);
923 EXPORT_SYMBOL_GPL(irq_modify_status
);
926 * irq_cpu_online - Invoke all irq_cpu_online functions.
928 * Iterate through all irqs and invoke the chip.irq_cpu_online()
931 void irq_cpu_online(void)
933 struct irq_desc
*desc
;
934 struct irq_chip
*chip
;
938 for_each_active_irq(irq
) {
939 desc
= irq_to_desc(irq
);
943 raw_spin_lock_irqsave(&desc
->lock
, flags
);
945 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
946 if (chip
&& chip
->irq_cpu_online
&&
947 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
948 !irqd_irq_disabled(&desc
->irq_data
)))
949 chip
->irq_cpu_online(&desc
->irq_data
);
951 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
956 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
958 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
961 void irq_cpu_offline(void)
963 struct irq_desc
*desc
;
964 struct irq_chip
*chip
;
968 for_each_active_irq(irq
) {
969 desc
= irq_to_desc(irq
);
973 raw_spin_lock_irqsave(&desc
->lock
, flags
);
975 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
976 if (chip
&& chip
->irq_cpu_offline
&&
977 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
978 !irqd_irq_disabled(&desc
->irq_data
)))
979 chip
->irq_cpu_offline(&desc
->irq_data
);
981 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
985 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
987 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
989 * @data: Pointer to interrupt specific data
991 void irq_chip_enable_parent(struct irq_data
*data
)
993 data
= data
->parent_data
;
994 if (data
->chip
->irq_enable
)
995 data
->chip
->irq_enable(data
);
997 data
->chip
->irq_unmask(data
);
1001 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1003 * @data: Pointer to interrupt specific data
1005 void irq_chip_disable_parent(struct irq_data
*data
)
1007 data
= data
->parent_data
;
1008 if (data
->chip
->irq_disable
)
1009 data
->chip
->irq_disable(data
);
1011 data
->chip
->irq_mask(data
);
1015 * irq_chip_ack_parent - Acknowledge the parent interrupt
1016 * @data: Pointer to interrupt specific data
1018 void irq_chip_ack_parent(struct irq_data
*data
)
1020 data
= data
->parent_data
;
1021 data
->chip
->irq_ack(data
);
1023 EXPORT_SYMBOL_GPL(irq_chip_ack_parent
);
1026 * irq_chip_mask_parent - Mask the parent interrupt
1027 * @data: Pointer to interrupt specific data
1029 void irq_chip_mask_parent(struct irq_data
*data
)
1031 data
= data
->parent_data
;
1032 data
->chip
->irq_mask(data
);
1034 EXPORT_SYMBOL_GPL(irq_chip_mask_parent
);
1037 * irq_chip_unmask_parent - Unmask the parent interrupt
1038 * @data: Pointer to interrupt specific data
1040 void irq_chip_unmask_parent(struct irq_data
*data
)
1042 data
= data
->parent_data
;
1043 data
->chip
->irq_unmask(data
);
1045 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent
);
1048 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1049 * @data: Pointer to interrupt specific data
1051 void irq_chip_eoi_parent(struct irq_data
*data
)
1053 data
= data
->parent_data
;
1054 data
->chip
->irq_eoi(data
);
1056 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent
);
1059 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1060 * @data: Pointer to interrupt specific data
1061 * @dest: The affinity mask to set
1062 * @force: Flag to enforce setting (disable online checks)
1064 * Conditinal, as the underlying parent chip might not implement it.
1066 int irq_chip_set_affinity_parent(struct irq_data
*data
,
1067 const struct cpumask
*dest
, bool force
)
1069 data
= data
->parent_data
;
1070 if (data
->chip
->irq_set_affinity
)
1071 return data
->chip
->irq_set_affinity(data
, dest
, force
);
1077 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1078 * @data: Pointer to interrupt specific data
1079 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1081 * Conditional, as the underlying parent chip might not implement it.
1083 int irq_chip_set_type_parent(struct irq_data
*data
, unsigned int type
)
1085 data
= data
->parent_data
;
1087 if (data
->chip
->irq_set_type
)
1088 return data
->chip
->irq_set_type(data
, type
);
1092 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent
);
1095 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1096 * @data: Pointer to interrupt specific data
1098 * Iterate through the domain hierarchy of the interrupt and check
1099 * whether a hw retrigger function exists. If yes, invoke it.
1101 int irq_chip_retrigger_hierarchy(struct irq_data
*data
)
1103 for (data
= data
->parent_data
; data
; data
= data
->parent_data
)
1104 if (data
->chip
&& data
->chip
->irq_retrigger
)
1105 return data
->chip
->irq_retrigger(data
);
1111 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1112 * @data: Pointer to interrupt specific data
1113 * @vcpu_info: The vcpu affinity information
1115 int irq_chip_set_vcpu_affinity_parent(struct irq_data
*data
, void *vcpu_info
)
1117 data
= data
->parent_data
;
1118 if (data
->chip
->irq_set_vcpu_affinity
)
1119 return data
->chip
->irq_set_vcpu_affinity(data
, vcpu_info
);
1125 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1126 * @data: Pointer to interrupt specific data
1127 * @on: Whether to set or reset the wake-up capability of this irq
1129 * Conditional, as the underlying parent chip might not implement it.
1131 int irq_chip_set_wake_parent(struct irq_data
*data
, unsigned int on
)
1133 data
= data
->parent_data
;
1134 if (data
->chip
->irq_set_wake
)
1135 return data
->chip
->irq_set_wake(data
, on
);
1142 * irq_chip_compose_msi_msg - Componse msi message for a irq chip
1143 * @data: Pointer to interrupt specific data
1144 * @msg: Pointer to the MSI message
1146 * For hierarchical domains we find the first chip in the hierarchy
1147 * which implements the irq_compose_msi_msg callback. For non
1148 * hierarchical we use the top level chip.
1150 int irq_chip_compose_msi_msg(struct irq_data
*data
, struct msi_msg
*msg
)
1152 struct irq_data
*pos
= NULL
;
1154 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1155 for (; data
; data
= data
->parent_data
)
1157 if (data
->chip
&& data
->chip
->irq_compose_msi_msg
)
1162 pos
->chip
->irq_compose_msi_msg(pos
, msg
);
1168 * irq_chip_pm_get - Enable power for an IRQ chip
1169 * @data: Pointer to interrupt specific data
1171 * Enable the power to the IRQ chip referenced by the interrupt data
1174 int irq_chip_pm_get(struct irq_data
*data
)
1178 if (IS_ENABLED(CONFIG_PM
) && data
->chip
->parent_device
) {
1179 retval
= pm_runtime_get_sync(data
->chip
->parent_device
);
1181 pm_runtime_put_noidle(data
->chip
->parent_device
);
1190 * irq_chip_pm_put - Disable power for an IRQ chip
1191 * @data: Pointer to interrupt specific data
1193 * Disable the power to the IRQ chip referenced by the interrupt data
1194 * structure, belongs. Note that power will only be disabled, once this
1195 * function has been called for all IRQs that have called irq_chip_pm_get().
1197 int irq_chip_pm_put(struct irq_data
*data
)
1201 if (IS_ENABLED(CONFIG_PM
) && data
->chip
->parent_device
)
1202 retval
= pm_runtime_put(data
->chip
->parent_device
);
1204 return (retval
< 0) ? retval
: 0;