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 type
&= IRQ_TYPE_SENSE_MASK
;
80 ret
= __irq_set_trigger(desc
, type
);
81 irq_put_desc_busunlock(desc
, flags
);
84 EXPORT_SYMBOL(irq_set_irq_type
);
87 * irq_set_handler_data - set irq handler data for an irq
88 * @irq: Interrupt number
89 * @data: Pointer to interrupt specific data
91 * Set the hardware irq controller data for an irq
93 int irq_set_handler_data(unsigned int irq
, void *data
)
96 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
100 desc
->irq_common_data
.handler_data
= data
;
101 irq_put_desc_unlock(desc
, flags
);
104 EXPORT_SYMBOL(irq_set_handler_data
);
107 * irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
108 * @irq_base: Interrupt number base
109 * @irq_offset: Interrupt number offset
110 * @entry: Pointer to MSI descriptor data
112 * Set the MSI descriptor entry for an irq at offset
114 int irq_set_msi_desc_off(unsigned int irq_base
, unsigned int irq_offset
,
115 struct msi_desc
*entry
)
118 struct irq_desc
*desc
= irq_get_desc_lock(irq_base
+ irq_offset
, &flags
, IRQ_GET_DESC_CHECK_GLOBAL
);
122 desc
->irq_common_data
.msi_desc
= entry
;
123 if (entry
&& !irq_offset
)
124 entry
->irq
= irq_base
;
125 irq_put_desc_unlock(desc
, flags
);
130 * irq_set_msi_desc - set MSI descriptor data for an irq
131 * @irq: Interrupt number
132 * @entry: Pointer to MSI descriptor data
134 * Set the MSI descriptor entry for an irq
136 int irq_set_msi_desc(unsigned int irq
, struct msi_desc
*entry
)
138 return irq_set_msi_desc_off(irq
, 0, entry
);
142 * irq_set_chip_data - set irq chip data for an irq
143 * @irq: Interrupt number
144 * @data: Pointer to chip specific data
146 * Set the hardware irq chip data for an irq
148 int irq_set_chip_data(unsigned int irq
, void *data
)
151 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
155 desc
->irq_data
.chip_data
= data
;
156 irq_put_desc_unlock(desc
, flags
);
159 EXPORT_SYMBOL(irq_set_chip_data
);
161 struct irq_data
*irq_get_irq_data(unsigned int irq
)
163 struct irq_desc
*desc
= irq_to_desc(irq
);
165 return desc
? &desc
->irq_data
: NULL
;
167 EXPORT_SYMBOL_GPL(irq_get_irq_data
);
169 static void irq_state_clr_disabled(struct irq_desc
*desc
)
171 irqd_clear(&desc
->irq_data
, IRQD_IRQ_DISABLED
);
174 static void irq_state_set_disabled(struct irq_desc
*desc
)
176 irqd_set(&desc
->irq_data
, IRQD_IRQ_DISABLED
);
179 static void irq_state_clr_masked(struct irq_desc
*desc
)
181 irqd_clear(&desc
->irq_data
, IRQD_IRQ_MASKED
);
184 static void irq_state_set_masked(struct irq_desc
*desc
)
186 irqd_set(&desc
->irq_data
, IRQD_IRQ_MASKED
);
189 int irq_startup(struct irq_desc
*desc
, bool resend
)
193 irq_state_clr_disabled(desc
);
196 irq_domain_activate_irq(&desc
->irq_data
);
197 if (desc
->irq_data
.chip
->irq_startup
) {
198 ret
= desc
->irq_data
.chip
->irq_startup(&desc
->irq_data
);
199 irq_state_clr_masked(desc
);
204 check_irq_resend(desc
);
208 void irq_shutdown(struct irq_desc
*desc
)
210 irq_state_set_disabled(desc
);
212 if (desc
->irq_data
.chip
->irq_shutdown
)
213 desc
->irq_data
.chip
->irq_shutdown(&desc
->irq_data
);
214 else if (desc
->irq_data
.chip
->irq_disable
)
215 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
217 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
218 irq_domain_deactivate_irq(&desc
->irq_data
);
219 irq_state_set_masked(desc
);
222 void irq_enable(struct irq_desc
*desc
)
224 irq_state_clr_disabled(desc
);
225 if (desc
->irq_data
.chip
->irq_enable
)
226 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
228 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
229 irq_state_clr_masked(desc
);
233 * irq_disable - Mark interrupt disabled
234 * @desc: irq descriptor which should be disabled
236 * If the chip does not implement the irq_disable callback, we
237 * use a lazy disable approach. That means we mark the interrupt
238 * disabled, but leave the hardware unmasked. That's an
239 * optimization because we avoid the hardware access for the
240 * common case where no interrupt happens after we marked it
241 * disabled. If an interrupt happens, then the interrupt flow
242 * handler masks the line at the hardware level and marks it
245 * If the interrupt chip does not implement the irq_disable callback,
246 * a driver can disable the lazy approach for a particular irq line by
247 * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
248 * be used for devices which cannot disable the interrupt at the
249 * device level under certain circumstances and have to use
250 * disable_irq[_nosync] instead.
252 void irq_disable(struct irq_desc
*desc
)
254 irq_state_set_disabled(desc
);
255 if (desc
->irq_data
.chip
->irq_disable
) {
256 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
257 irq_state_set_masked(desc
);
258 } else if (irq_settings_disable_unlazy(desc
)) {
263 void irq_percpu_enable(struct irq_desc
*desc
, unsigned int cpu
)
265 if (desc
->irq_data
.chip
->irq_enable
)
266 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
268 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
269 cpumask_set_cpu(cpu
, desc
->percpu_enabled
);
272 void irq_percpu_disable(struct irq_desc
*desc
, unsigned int cpu
)
274 if (desc
->irq_data
.chip
->irq_disable
)
275 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
277 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
278 cpumask_clear_cpu(cpu
, desc
->percpu_enabled
);
281 static inline void mask_ack_irq(struct irq_desc
*desc
)
283 if (desc
->irq_data
.chip
->irq_mask_ack
)
284 desc
->irq_data
.chip
->irq_mask_ack(&desc
->irq_data
);
286 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
287 if (desc
->irq_data
.chip
->irq_ack
)
288 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
290 irq_state_set_masked(desc
);
293 void mask_irq(struct irq_desc
*desc
)
295 if (desc
->irq_data
.chip
->irq_mask
) {
296 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
297 irq_state_set_masked(desc
);
301 void unmask_irq(struct irq_desc
*desc
)
303 if (desc
->irq_data
.chip
->irq_unmask
) {
304 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
305 irq_state_clr_masked(desc
);
309 void unmask_threaded_irq(struct irq_desc
*desc
)
311 struct irq_chip
*chip
= desc
->irq_data
.chip
;
313 if (chip
->flags
& IRQCHIP_EOI_THREADED
)
314 chip
->irq_eoi(&desc
->irq_data
);
316 if (chip
->irq_unmask
) {
317 chip
->irq_unmask(&desc
->irq_data
);
318 irq_state_clr_masked(desc
);
323 * handle_nested_irq - Handle a nested irq from a irq thread
324 * @irq: the interrupt number
326 * Handle interrupts which are nested into a threaded interrupt
327 * handler. The handler function is called inside the calling
330 void handle_nested_irq(unsigned int irq
)
332 struct irq_desc
*desc
= irq_to_desc(irq
);
333 struct irqaction
*action
;
334 irqreturn_t action_ret
;
338 raw_spin_lock_irq(&desc
->lock
);
340 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
342 action
= desc
->action
;
343 if (unlikely(!action
|| irqd_irq_disabled(&desc
->irq_data
))) {
344 desc
->istate
|= IRQS_PENDING
;
348 kstat_incr_irqs_this_cpu(desc
);
349 irqd_set(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
350 raw_spin_unlock_irq(&desc
->lock
);
352 action_ret
= action
->thread_fn(action
->irq
, action
->dev_id
);
354 note_interrupt(desc
, action_ret
);
356 raw_spin_lock_irq(&desc
->lock
);
357 irqd_clear(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
360 raw_spin_unlock_irq(&desc
->lock
);
362 EXPORT_SYMBOL_GPL(handle_nested_irq
);
364 static bool irq_check_poll(struct irq_desc
*desc
)
366 if (!(desc
->istate
& IRQS_POLL_INPROGRESS
))
368 return irq_wait_for_poll(desc
);
371 static bool irq_may_run(struct irq_desc
*desc
)
373 unsigned int mask
= IRQD_IRQ_INPROGRESS
| IRQD_WAKEUP_ARMED
;
376 * If the interrupt is not in progress and is not an armed
377 * wakeup interrupt, proceed.
379 if (!irqd_has_set(&desc
->irq_data
, mask
))
383 * If the interrupt is an armed wakeup source, mark it pending
384 * and suspended, disable it and notify the pm core about the
387 if (irq_pm_check_wakeup(desc
))
391 * Handle a potential concurrent poll on a different core.
393 return irq_check_poll(desc
);
397 * handle_simple_irq - Simple and software-decoded IRQs.
398 * @desc: the interrupt description structure for this irq
400 * Simple interrupts are either sent from a demultiplexing interrupt
401 * handler or come from hardware, where no interrupt hardware control
404 * Note: The caller is expected to handle the ack, clear, mask and
405 * unmask issues if necessary.
407 void handle_simple_irq(struct irq_desc
*desc
)
409 raw_spin_lock(&desc
->lock
);
411 if (!irq_may_run(desc
))
414 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
416 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
417 desc
->istate
|= IRQS_PENDING
;
421 kstat_incr_irqs_this_cpu(desc
);
422 handle_irq_event(desc
);
425 raw_spin_unlock(&desc
->lock
);
427 EXPORT_SYMBOL_GPL(handle_simple_irq
);
430 * handle_untracked_irq - Simple and software-decoded IRQs.
431 * @desc: the interrupt description structure for this irq
433 * Untracked interrupts are sent from a demultiplexing interrupt
434 * handler when the demultiplexer does not know which device it its
435 * multiplexed irq domain generated the interrupt. IRQ's handled
436 * through here are not subjected to stats tracking, randomness, or
437 * spurious interrupt detection.
439 * Note: Like handle_simple_irq, the caller is expected to handle
440 * the ack, clear, mask and unmask issues if necessary.
442 void handle_untracked_irq(struct irq_desc
*desc
)
444 unsigned int flags
= 0;
446 raw_spin_lock(&desc
->lock
);
448 if (!irq_may_run(desc
))
451 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
453 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
454 desc
->istate
|= IRQS_PENDING
;
458 desc
->istate
&= ~IRQS_PENDING
;
459 irqd_set(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
460 raw_spin_unlock(&desc
->lock
);
462 __handle_irq_event_percpu(desc
, &flags
);
464 raw_spin_lock(&desc
->lock
);
465 irqd_clear(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
468 raw_spin_unlock(&desc
->lock
);
470 EXPORT_SYMBOL_GPL(handle_untracked_irq
);
473 * Called unconditionally from handle_level_irq() and only for oneshot
474 * interrupts from handle_fasteoi_irq()
476 static void cond_unmask_irq(struct irq_desc
*desc
)
479 * We need to unmask in the following cases:
480 * - Standard level irq (IRQF_ONESHOT is not set)
481 * - Oneshot irq which did not wake the thread (caused by a
482 * spurious interrupt or a primary handler handling it
485 if (!irqd_irq_disabled(&desc
->irq_data
) &&
486 irqd_irq_masked(&desc
->irq_data
) && !desc
->threads_oneshot
)
491 * handle_level_irq - Level type irq handler
492 * @desc: the interrupt description structure for this irq
494 * Level type interrupts are active as long as the hardware line has
495 * the active level. This may require to mask the interrupt and unmask
496 * it after the associated handler has acknowledged the device, so the
497 * interrupt line is back to inactive.
499 void handle_level_irq(struct irq_desc
*desc
)
501 raw_spin_lock(&desc
->lock
);
504 if (!irq_may_run(desc
))
507 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
510 * If its disabled or no action available
511 * keep it masked and get out of here
513 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
514 desc
->istate
|= IRQS_PENDING
;
518 kstat_incr_irqs_this_cpu(desc
);
519 handle_irq_event(desc
);
521 cond_unmask_irq(desc
);
524 raw_spin_unlock(&desc
->lock
);
526 EXPORT_SYMBOL_GPL(handle_level_irq
);
528 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
529 static inline void preflow_handler(struct irq_desc
*desc
)
531 if (desc
->preflow_handler
)
532 desc
->preflow_handler(&desc
->irq_data
);
535 static inline void preflow_handler(struct irq_desc
*desc
) { }
538 static void cond_unmask_eoi_irq(struct irq_desc
*desc
, struct irq_chip
*chip
)
540 if (!(desc
->istate
& IRQS_ONESHOT
)) {
541 chip
->irq_eoi(&desc
->irq_data
);
545 * We need to unmask in the following cases:
546 * - Oneshot irq which did not wake the thread (caused by a
547 * spurious interrupt or a primary handler handling it
550 if (!irqd_irq_disabled(&desc
->irq_data
) &&
551 irqd_irq_masked(&desc
->irq_data
) && !desc
->threads_oneshot
) {
552 chip
->irq_eoi(&desc
->irq_data
);
554 } else if (!(chip
->flags
& IRQCHIP_EOI_THREADED
)) {
555 chip
->irq_eoi(&desc
->irq_data
);
560 * handle_fasteoi_irq - irq handler for transparent controllers
561 * @desc: the interrupt description structure for this irq
563 * Only a single callback will be issued to the chip: an ->eoi()
564 * call when the interrupt has been serviced. This enables support
565 * for modern forms of interrupt handlers, which handle the flow
566 * details in hardware, transparently.
568 void handle_fasteoi_irq(struct irq_desc
*desc
)
570 struct irq_chip
*chip
= desc
->irq_data
.chip
;
572 raw_spin_lock(&desc
->lock
);
574 if (!irq_may_run(desc
))
577 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
580 * If its disabled or no action available
581 * then mask it and get out of here:
583 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
584 desc
->istate
|= IRQS_PENDING
;
589 kstat_incr_irqs_this_cpu(desc
);
590 if (desc
->istate
& IRQS_ONESHOT
)
593 preflow_handler(desc
);
594 handle_irq_event(desc
);
596 cond_unmask_eoi_irq(desc
, chip
);
598 raw_spin_unlock(&desc
->lock
);
601 if (!(chip
->flags
& IRQCHIP_EOI_IF_HANDLED
))
602 chip
->irq_eoi(&desc
->irq_data
);
603 raw_spin_unlock(&desc
->lock
);
605 EXPORT_SYMBOL_GPL(handle_fasteoi_irq
);
608 * handle_edge_irq - edge type IRQ handler
609 * @desc: the interrupt description structure for this irq
611 * Interrupt occures on the falling and/or rising edge of a hardware
612 * signal. The occurrence is latched into the irq controller hardware
613 * and must be acked in order to be reenabled. After the ack another
614 * interrupt can happen on the same source even before the first one
615 * is handled by the associated event handler. If this happens it
616 * might be necessary to disable (mask) the interrupt depending on the
617 * controller hardware. This requires to reenable the interrupt inside
618 * of the loop which handles the interrupts which have arrived while
619 * the handler was running. If all pending interrupts are handled, the
622 void handle_edge_irq(struct irq_desc
*desc
)
624 raw_spin_lock(&desc
->lock
);
626 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
628 if (!irq_may_run(desc
)) {
629 desc
->istate
|= IRQS_PENDING
;
635 * If its disabled or no action available then mask it and get
638 if (irqd_irq_disabled(&desc
->irq_data
) || !desc
->action
) {
639 desc
->istate
|= IRQS_PENDING
;
644 kstat_incr_irqs_this_cpu(desc
);
646 /* Start handling the irq */
647 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
650 if (unlikely(!desc
->action
)) {
656 * When another irq arrived while we were handling
657 * one, we could have masked the irq.
658 * Renable it, if it was not disabled in meantime.
660 if (unlikely(desc
->istate
& IRQS_PENDING
)) {
661 if (!irqd_irq_disabled(&desc
->irq_data
) &&
662 irqd_irq_masked(&desc
->irq_data
))
666 handle_irq_event(desc
);
668 } while ((desc
->istate
& IRQS_PENDING
) &&
669 !irqd_irq_disabled(&desc
->irq_data
));
672 raw_spin_unlock(&desc
->lock
);
674 EXPORT_SYMBOL(handle_edge_irq
);
676 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
678 * handle_edge_eoi_irq - edge eoi type IRQ handler
679 * @desc: the interrupt description structure for this irq
681 * Similar as the above handle_edge_irq, but using eoi and w/o the
684 void handle_edge_eoi_irq(struct irq_desc
*desc
)
686 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
688 raw_spin_lock(&desc
->lock
);
690 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
692 if (!irq_may_run(desc
)) {
693 desc
->istate
|= IRQS_PENDING
;
698 * If its disabled or no action available then mask it and get
701 if (irqd_irq_disabled(&desc
->irq_data
) || !desc
->action
) {
702 desc
->istate
|= IRQS_PENDING
;
706 kstat_incr_irqs_this_cpu(desc
);
709 if (unlikely(!desc
->action
))
712 handle_irq_event(desc
);
714 } while ((desc
->istate
& IRQS_PENDING
) &&
715 !irqd_irq_disabled(&desc
->irq_data
));
718 chip
->irq_eoi(&desc
->irq_data
);
719 raw_spin_unlock(&desc
->lock
);
724 * handle_percpu_irq - Per CPU local irq handler
725 * @desc: the interrupt description structure for this irq
727 * Per CPU interrupts on SMP machines without locking requirements
729 void handle_percpu_irq(struct irq_desc
*desc
)
731 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
733 kstat_incr_irqs_this_cpu(desc
);
736 chip
->irq_ack(&desc
->irq_data
);
738 handle_irq_event_percpu(desc
);
741 chip
->irq_eoi(&desc
->irq_data
);
745 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
746 * @desc: the interrupt description structure for this irq
748 * Per CPU interrupts on SMP machines without locking requirements. Same as
749 * handle_percpu_irq() above but with the following extras:
751 * action->percpu_dev_id is a pointer to percpu variables which
752 * contain the real device id for the cpu on which this handler is
755 void handle_percpu_devid_irq(struct irq_desc
*desc
)
757 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
758 struct irqaction
*action
= desc
->action
;
759 void *dev_id
= raw_cpu_ptr(action
->percpu_dev_id
);
760 unsigned int irq
= irq_desc_get_irq(desc
);
763 kstat_incr_irqs_this_cpu(desc
);
766 chip
->irq_ack(&desc
->irq_data
);
768 trace_irq_handler_entry(irq
, action
);
769 res
= action
->handler(irq
, dev_id
);
770 trace_irq_handler_exit(irq
, action
, res
);
773 chip
->irq_eoi(&desc
->irq_data
);
777 __irq_do_set_handler(struct irq_desc
*desc
, irq_flow_handler_t handle
,
778 int is_chained
, const char *name
)
781 handle
= handle_bad_irq
;
783 struct irq_data
*irq_data
= &desc
->irq_data
;
784 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
786 * With hierarchical domains we might run into a
787 * situation where the outermost chip is not yet set
788 * up, but the inner chips are there. Instead of
789 * bailing we install the handler, but obviously we
790 * cannot enable/startup the interrupt at this point.
793 if (irq_data
->chip
!= &no_irq_chip
)
796 * Bail out if the outer chip is not set up
797 * and the interrrupt supposed to be started
800 if (WARN_ON(is_chained
))
803 irq_data
= irq_data
->parent_data
;
806 if (WARN_ON(!irq_data
|| irq_data
->chip
== &no_irq_chip
))
811 if (handle
== handle_bad_irq
) {
812 if (desc
->irq_data
.chip
!= &no_irq_chip
)
814 irq_state_set_disabled(desc
);
819 desc
->handle_irq
= handle
;
822 if (handle
!= handle_bad_irq
&& is_chained
) {
823 irq_settings_set_noprobe(desc
);
824 irq_settings_set_norequest(desc
);
825 irq_settings_set_nothread(desc
);
826 desc
->action
= &chained_action
;
827 irq_startup(desc
, true);
832 __irq_set_handler(unsigned int irq
, irq_flow_handler_t handle
, int is_chained
,
836 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, 0);
841 __irq_do_set_handler(desc
, handle
, is_chained
, name
);
842 irq_put_desc_busunlock(desc
, flags
);
844 EXPORT_SYMBOL_GPL(__irq_set_handler
);
847 irq_set_chained_handler_and_data(unsigned int irq
, irq_flow_handler_t handle
,
851 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, 0);
856 __irq_do_set_handler(desc
, handle
, 1, NULL
);
857 desc
->irq_common_data
.handler_data
= data
;
859 irq_put_desc_busunlock(desc
, flags
);
861 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data
);
864 irq_set_chip_and_handler_name(unsigned int irq
, struct irq_chip
*chip
,
865 irq_flow_handler_t handle
, const char *name
)
867 irq_set_chip(irq
, chip
);
868 __irq_set_handler(irq
, handle
, 0, name
);
870 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name
);
872 void irq_modify_status(unsigned int irq
, unsigned long clr
, unsigned long set
)
875 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
879 irq_settings_clr_and_set(desc
, clr
, set
);
881 irqd_clear(&desc
->irq_data
, IRQD_NO_BALANCING
| IRQD_PER_CPU
|
882 IRQD_TRIGGER_MASK
| IRQD_LEVEL
| IRQD_MOVE_PCNTXT
);
883 if (irq_settings_has_no_balance_set(desc
))
884 irqd_set(&desc
->irq_data
, IRQD_NO_BALANCING
);
885 if (irq_settings_is_per_cpu(desc
))
886 irqd_set(&desc
->irq_data
, IRQD_PER_CPU
);
887 if (irq_settings_can_move_pcntxt(desc
))
888 irqd_set(&desc
->irq_data
, IRQD_MOVE_PCNTXT
);
889 if (irq_settings_is_level(desc
))
890 irqd_set(&desc
->irq_data
, IRQD_LEVEL
);
892 irqd_set(&desc
->irq_data
, irq_settings_get_trigger_mask(desc
));
894 irq_put_desc_unlock(desc
, flags
);
896 EXPORT_SYMBOL_GPL(irq_modify_status
);
899 * irq_cpu_online - Invoke all irq_cpu_online functions.
901 * Iterate through all irqs and invoke the chip.irq_cpu_online()
904 void irq_cpu_online(void)
906 struct irq_desc
*desc
;
907 struct irq_chip
*chip
;
911 for_each_active_irq(irq
) {
912 desc
= irq_to_desc(irq
);
916 raw_spin_lock_irqsave(&desc
->lock
, flags
);
918 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
919 if (chip
&& chip
->irq_cpu_online
&&
920 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
921 !irqd_irq_disabled(&desc
->irq_data
)))
922 chip
->irq_cpu_online(&desc
->irq_data
);
924 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
929 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
931 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
934 void irq_cpu_offline(void)
936 struct irq_desc
*desc
;
937 struct irq_chip
*chip
;
941 for_each_active_irq(irq
) {
942 desc
= irq_to_desc(irq
);
946 raw_spin_lock_irqsave(&desc
->lock
, flags
);
948 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
949 if (chip
&& chip
->irq_cpu_offline
&&
950 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
951 !irqd_irq_disabled(&desc
->irq_data
)))
952 chip
->irq_cpu_offline(&desc
->irq_data
);
954 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
958 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
960 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
962 * @data: Pointer to interrupt specific data
964 void irq_chip_enable_parent(struct irq_data
*data
)
966 data
= data
->parent_data
;
967 if (data
->chip
->irq_enable
)
968 data
->chip
->irq_enable(data
);
970 data
->chip
->irq_unmask(data
);
974 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
976 * @data: Pointer to interrupt specific data
978 void irq_chip_disable_parent(struct irq_data
*data
)
980 data
= data
->parent_data
;
981 if (data
->chip
->irq_disable
)
982 data
->chip
->irq_disable(data
);
984 data
->chip
->irq_mask(data
);
988 * irq_chip_ack_parent - Acknowledge the parent interrupt
989 * @data: Pointer to interrupt specific data
991 void irq_chip_ack_parent(struct irq_data
*data
)
993 data
= data
->parent_data
;
994 data
->chip
->irq_ack(data
);
996 EXPORT_SYMBOL_GPL(irq_chip_ack_parent
);
999 * irq_chip_mask_parent - Mask the parent interrupt
1000 * @data: Pointer to interrupt specific data
1002 void irq_chip_mask_parent(struct irq_data
*data
)
1004 data
= data
->parent_data
;
1005 data
->chip
->irq_mask(data
);
1007 EXPORT_SYMBOL_GPL(irq_chip_mask_parent
);
1010 * irq_chip_unmask_parent - Unmask the parent interrupt
1011 * @data: Pointer to interrupt specific data
1013 void irq_chip_unmask_parent(struct irq_data
*data
)
1015 data
= data
->parent_data
;
1016 data
->chip
->irq_unmask(data
);
1018 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent
);
1021 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1022 * @data: Pointer to interrupt specific data
1024 void irq_chip_eoi_parent(struct irq_data
*data
)
1026 data
= data
->parent_data
;
1027 data
->chip
->irq_eoi(data
);
1029 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent
);
1032 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1033 * @data: Pointer to interrupt specific data
1034 * @dest: The affinity mask to set
1035 * @force: Flag to enforce setting (disable online checks)
1037 * Conditinal, as the underlying parent chip might not implement it.
1039 int irq_chip_set_affinity_parent(struct irq_data
*data
,
1040 const struct cpumask
*dest
, bool force
)
1042 data
= data
->parent_data
;
1043 if (data
->chip
->irq_set_affinity
)
1044 return data
->chip
->irq_set_affinity(data
, dest
, force
);
1050 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1051 * @data: Pointer to interrupt specific data
1052 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1054 * Conditional, as the underlying parent chip might not implement it.
1056 int irq_chip_set_type_parent(struct irq_data
*data
, unsigned int type
)
1058 data
= data
->parent_data
;
1060 if (data
->chip
->irq_set_type
)
1061 return data
->chip
->irq_set_type(data
, type
);
1065 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent
);
1068 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1069 * @data: Pointer to interrupt specific data
1071 * Iterate through the domain hierarchy of the interrupt and check
1072 * whether a hw retrigger function exists. If yes, invoke it.
1074 int irq_chip_retrigger_hierarchy(struct irq_data
*data
)
1076 for (data
= data
->parent_data
; data
; data
= data
->parent_data
)
1077 if (data
->chip
&& data
->chip
->irq_retrigger
)
1078 return data
->chip
->irq_retrigger(data
);
1084 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1085 * @data: Pointer to interrupt specific data
1086 * @vcpu_info: The vcpu affinity information
1088 int irq_chip_set_vcpu_affinity_parent(struct irq_data
*data
, void *vcpu_info
)
1090 data
= data
->parent_data
;
1091 if (data
->chip
->irq_set_vcpu_affinity
)
1092 return data
->chip
->irq_set_vcpu_affinity(data
, vcpu_info
);
1098 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1099 * @data: Pointer to interrupt specific data
1100 * @on: Whether to set or reset the wake-up capability of this irq
1102 * Conditional, as the underlying parent chip might not implement it.
1104 int irq_chip_set_wake_parent(struct irq_data
*data
, unsigned int on
)
1106 data
= data
->parent_data
;
1107 if (data
->chip
->irq_set_wake
)
1108 return data
->chip
->irq_set_wake(data
, on
);
1115 * irq_chip_compose_msi_msg - Componse msi message for a irq chip
1116 * @data: Pointer to interrupt specific data
1117 * @msg: Pointer to the MSI message
1119 * For hierarchical domains we find the first chip in the hierarchy
1120 * which implements the irq_compose_msi_msg callback. For non
1121 * hierarchical we use the top level chip.
1123 int irq_chip_compose_msi_msg(struct irq_data
*data
, struct msi_msg
*msg
)
1125 struct irq_data
*pos
= NULL
;
1127 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1128 for (; data
; data
= data
->parent_data
)
1130 if (data
->chip
&& data
->chip
->irq_compose_msi_msg
)
1135 pos
->chip
->irq_compose_msi_msg(pos
, msg
);
1141 * irq_chip_pm_get - Enable power for an IRQ chip
1142 * @data: Pointer to interrupt specific data
1144 * Enable the power to the IRQ chip referenced by the interrupt data
1147 int irq_chip_pm_get(struct irq_data
*data
)
1151 if (IS_ENABLED(CONFIG_PM
) && data
->chip
->parent_device
) {
1152 retval
= pm_runtime_get_sync(data
->chip
->parent_device
);
1154 pm_runtime_put_noidle(data
->chip
->parent_device
);
1163 * irq_chip_pm_put - Disable power for an IRQ chip
1164 * @data: Pointer to interrupt specific data
1166 * Disable the power to the IRQ chip referenced by the interrupt data
1167 * structure, belongs. Note that power will only be disabled, once this
1168 * function has been called for all IRQs that have called irq_chip_pm_get().
1170 int irq_chip_pm_put(struct irq_data
*data
)
1174 if (IS_ENABLED(CONFIG_PM
) && data
->chip
->parent_device
)
1175 retval
= pm_runtime_put(data
->chip
->parent_device
);
1177 return (retval
< 0) ? retval
: 0;