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>
19 #include "internals.h"
22 * irq_set_chip - set the irq chip for an irq
24 * @chip: pointer to irq chip description structure
26 int irq_set_chip(unsigned int irq
, struct irq_chip
*chip
)
29 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
37 desc
->irq_data
.chip
= chip
;
38 irq_put_desc_unlock(desc
, flags
);
40 * For !CONFIG_SPARSE_IRQ make the irq show up in
41 * allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
42 * already marked, and this call is harmless.
47 EXPORT_SYMBOL(irq_set_chip
);
50 * irq_set_type - set the irq trigger type for an irq
52 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
54 int irq_set_irq_type(unsigned int irq
, unsigned int type
)
57 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, IRQ_GET_DESC_CHECK_GLOBAL
);
63 type
&= IRQ_TYPE_SENSE_MASK
;
64 ret
= __irq_set_trigger(desc
, irq
, type
);
65 irq_put_desc_busunlock(desc
, flags
);
68 EXPORT_SYMBOL(irq_set_irq_type
);
71 * irq_set_handler_data - set irq handler data for an irq
72 * @irq: Interrupt number
73 * @data: Pointer to interrupt specific data
75 * Set the hardware irq controller data for an irq
77 int irq_set_handler_data(unsigned int irq
, void *data
)
80 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
84 desc
->irq_data
.handler_data
= data
;
85 irq_put_desc_unlock(desc
, flags
);
88 EXPORT_SYMBOL(irq_set_handler_data
);
91 * irq_set_msi_desc - set MSI descriptor data for an irq
92 * @irq: Interrupt number
93 * @entry: Pointer to MSI descriptor data
95 * Set the MSI descriptor entry for an irq
97 int irq_set_msi_desc(unsigned int irq
, struct msi_desc
*entry
)
100 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, IRQ_GET_DESC_CHECK_GLOBAL
);
104 desc
->irq_data
.msi_desc
= entry
;
107 irq_put_desc_unlock(desc
, flags
);
112 * irq_set_chip_data - set irq chip data for an irq
113 * @irq: Interrupt number
114 * @data: Pointer to chip specific data
116 * Set the hardware irq chip data for an irq
118 int irq_set_chip_data(unsigned int irq
, void *data
)
121 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
125 desc
->irq_data
.chip_data
= data
;
126 irq_put_desc_unlock(desc
, flags
);
129 EXPORT_SYMBOL(irq_set_chip_data
);
131 struct irq_data
*irq_get_irq_data(unsigned int irq
)
133 struct irq_desc
*desc
= irq_to_desc(irq
);
135 return desc
? &desc
->irq_data
: NULL
;
137 EXPORT_SYMBOL_GPL(irq_get_irq_data
);
139 static void irq_state_clr_disabled(struct irq_desc
*desc
)
141 irqd_clear(&desc
->irq_data
, IRQD_IRQ_DISABLED
);
144 static void irq_state_set_disabled(struct irq_desc
*desc
)
146 irqd_set(&desc
->irq_data
, IRQD_IRQ_DISABLED
);
149 static void irq_state_clr_masked(struct irq_desc
*desc
)
151 irqd_clear(&desc
->irq_data
, IRQD_IRQ_MASKED
);
154 static void irq_state_set_masked(struct irq_desc
*desc
)
156 irqd_set(&desc
->irq_data
, IRQD_IRQ_MASKED
);
159 int irq_startup(struct irq_desc
*desc
, bool resend
)
163 irq_state_clr_disabled(desc
);
166 if (desc
->irq_data
.chip
->irq_startup
) {
167 ret
= desc
->irq_data
.chip
->irq_startup(&desc
->irq_data
);
168 irq_state_clr_masked(desc
);
173 check_irq_resend(desc
, desc
->irq_data
.irq
);
177 void irq_shutdown(struct irq_desc
*desc
)
179 irq_state_set_disabled(desc
);
181 if (desc
->irq_data
.chip
->irq_shutdown
)
182 desc
->irq_data
.chip
->irq_shutdown(&desc
->irq_data
);
183 else if (desc
->irq_data
.chip
->irq_disable
)
184 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
186 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
187 irq_state_set_masked(desc
);
190 void irq_enable(struct irq_desc
*desc
)
192 irq_state_clr_disabled(desc
);
193 if (desc
->irq_data
.chip
->irq_enable
)
194 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
196 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
197 irq_state_clr_masked(desc
);
200 void irq_disable(struct irq_desc
*desc
)
202 irq_state_set_disabled(desc
);
203 if (desc
->irq_data
.chip
->irq_disable
) {
204 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
205 irq_state_set_masked(desc
);
209 void irq_percpu_enable(struct irq_desc
*desc
, unsigned int cpu
)
211 if (desc
->irq_data
.chip
->irq_enable
)
212 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
214 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
215 cpumask_set_cpu(cpu
, desc
->percpu_enabled
);
218 void irq_percpu_disable(struct irq_desc
*desc
, unsigned int cpu
)
220 if (desc
->irq_data
.chip
->irq_disable
)
221 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
223 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
224 cpumask_clear_cpu(cpu
, desc
->percpu_enabled
);
227 static inline void mask_ack_irq(struct irq_desc
*desc
)
229 if (desc
->irq_data
.chip
->irq_mask_ack
)
230 desc
->irq_data
.chip
->irq_mask_ack(&desc
->irq_data
);
232 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
233 if (desc
->irq_data
.chip
->irq_ack
)
234 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
236 irq_state_set_masked(desc
);
239 void mask_irq(struct irq_desc
*desc
)
241 if (desc
->irq_data
.chip
->irq_mask
) {
242 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
243 irq_state_set_masked(desc
);
247 void unmask_irq(struct irq_desc
*desc
)
249 if (desc
->irq_data
.chip
->irq_unmask
) {
250 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
251 irq_state_clr_masked(desc
);
256 * handle_nested_irq - Handle a nested irq from a irq thread
257 * @irq: the interrupt number
259 * Handle interrupts which are nested into a threaded interrupt
260 * handler. The handler function is called inside the calling
263 void handle_nested_irq(unsigned int irq
)
265 struct irq_desc
*desc
= irq_to_desc(irq
);
266 struct irqaction
*action
;
267 irqreturn_t action_ret
;
271 raw_spin_lock_irq(&desc
->lock
);
273 kstat_incr_irqs_this_cpu(irq
, desc
);
275 action
= desc
->action
;
276 if (unlikely(!action
|| irqd_irq_disabled(&desc
->irq_data
)))
279 irqd_set(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
280 raw_spin_unlock_irq(&desc
->lock
);
282 action_ret
= action
->thread_fn(action
->irq
, action
->dev_id
);
284 note_interrupt(irq
, desc
, action_ret
);
286 raw_spin_lock_irq(&desc
->lock
);
287 irqd_clear(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
290 raw_spin_unlock_irq(&desc
->lock
);
292 EXPORT_SYMBOL_GPL(handle_nested_irq
);
294 static bool irq_check_poll(struct irq_desc
*desc
)
296 if (!(desc
->istate
& IRQS_POLL_INPROGRESS
))
298 return irq_wait_for_poll(desc
);
302 * handle_simple_irq - Simple and software-decoded IRQs.
303 * @irq: the interrupt number
304 * @desc: the interrupt description structure for this irq
306 * Simple interrupts are either sent from a demultiplexing interrupt
307 * handler or come from hardware, where no interrupt hardware control
310 * Note: The caller is expected to handle the ack, clear, mask and
311 * unmask issues if necessary.
314 handle_simple_irq(unsigned int irq
, struct irq_desc
*desc
)
316 raw_spin_lock(&desc
->lock
);
318 if (unlikely(irqd_irq_inprogress(&desc
->irq_data
)))
319 if (!irq_check_poll(desc
))
322 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
323 kstat_incr_irqs_this_cpu(irq
, desc
);
325 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
)))
328 handle_irq_event(desc
);
331 raw_spin_unlock(&desc
->lock
);
333 EXPORT_SYMBOL_GPL(handle_simple_irq
);
336 * Called unconditionally from handle_level_irq() and only for oneshot
337 * interrupts from handle_fasteoi_irq()
339 static void cond_unmask_irq(struct irq_desc
*desc
)
342 * We need to unmask in the following cases:
343 * - Standard level irq (IRQF_ONESHOT is not set)
344 * - Oneshot irq which did not wake the thread (caused by a
345 * spurious interrupt or a primary handler handling it
348 if (!irqd_irq_disabled(&desc
->irq_data
) &&
349 irqd_irq_masked(&desc
->irq_data
) && !desc
->threads_oneshot
)
354 * handle_level_irq - Level type irq handler
355 * @irq: the interrupt number
356 * @desc: the interrupt description structure for this irq
358 * Level type interrupts are active as long as the hardware line has
359 * the active level. This may require to mask the interrupt and unmask
360 * it after the associated handler has acknowledged the device, so the
361 * interrupt line is back to inactive.
364 handle_level_irq(unsigned int irq
, struct irq_desc
*desc
)
366 raw_spin_lock(&desc
->lock
);
369 if (unlikely(irqd_irq_inprogress(&desc
->irq_data
)))
370 if (!irq_check_poll(desc
))
373 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
374 kstat_incr_irqs_this_cpu(irq
, desc
);
377 * If its disabled or no action available
378 * keep it masked and get out of here
380 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
)))
383 handle_irq_event(desc
);
385 cond_unmask_irq(desc
);
388 raw_spin_unlock(&desc
->lock
);
390 EXPORT_SYMBOL_GPL(handle_level_irq
);
392 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
393 static inline void preflow_handler(struct irq_desc
*desc
)
395 if (desc
->preflow_handler
)
396 desc
->preflow_handler(&desc
->irq_data
);
399 static inline void preflow_handler(struct irq_desc
*desc
) { }
403 * handle_fasteoi_irq - irq handler for transparent controllers
404 * @irq: the interrupt number
405 * @desc: the interrupt description structure for this irq
407 * Only a single callback will be issued to the chip: an ->eoi()
408 * call when the interrupt has been serviced. This enables support
409 * for modern forms of interrupt handlers, which handle the flow
410 * details in hardware, transparently.
413 handle_fasteoi_irq(unsigned int irq
, struct irq_desc
*desc
)
415 raw_spin_lock(&desc
->lock
);
417 if (unlikely(irqd_irq_inprogress(&desc
->irq_data
)))
418 if (!irq_check_poll(desc
))
421 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
422 kstat_incr_irqs_this_cpu(irq
, desc
);
425 * If its disabled or no action available
426 * then mask it and get out of here:
428 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
429 desc
->istate
|= IRQS_PENDING
;
434 if (desc
->istate
& IRQS_ONESHOT
)
437 preflow_handler(desc
);
438 handle_irq_event(desc
);
440 if (desc
->istate
& IRQS_ONESHOT
)
441 cond_unmask_irq(desc
);
444 desc
->irq_data
.chip
->irq_eoi(&desc
->irq_data
);
446 raw_spin_unlock(&desc
->lock
);
449 if (!(desc
->irq_data
.chip
->flags
& IRQCHIP_EOI_IF_HANDLED
))
455 * handle_edge_irq - edge type IRQ handler
456 * @irq: the interrupt number
457 * @desc: the interrupt description structure for this irq
459 * Interrupt occures on the falling and/or rising edge of a hardware
460 * signal. The occurrence is latched into the irq controller hardware
461 * and must be acked in order to be reenabled. After the ack another
462 * interrupt can happen on the same source even before the first one
463 * is handled by the associated event handler. If this happens it
464 * might be necessary to disable (mask) the interrupt depending on the
465 * controller hardware. This requires to reenable the interrupt inside
466 * of the loop which handles the interrupts which have arrived while
467 * the handler was running. If all pending interrupts are handled, the
471 handle_edge_irq(unsigned int irq
, struct irq_desc
*desc
)
473 raw_spin_lock(&desc
->lock
);
475 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
477 * If we're currently running this IRQ, or its disabled,
478 * we shouldn't process the IRQ. Mark it pending, handle
479 * the necessary masking and go out
481 if (unlikely(irqd_irq_disabled(&desc
->irq_data
) ||
482 irqd_irq_inprogress(&desc
->irq_data
) || !desc
->action
)) {
483 if (!irq_check_poll(desc
)) {
484 desc
->istate
|= IRQS_PENDING
;
489 kstat_incr_irqs_this_cpu(irq
, desc
);
491 /* Start handling the irq */
492 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
495 if (unlikely(!desc
->action
)) {
501 * When another irq arrived while we were handling
502 * one, we could have masked the irq.
503 * Renable it, if it was not disabled in meantime.
505 if (unlikely(desc
->istate
& IRQS_PENDING
)) {
506 if (!irqd_irq_disabled(&desc
->irq_data
) &&
507 irqd_irq_masked(&desc
->irq_data
))
511 handle_irq_event(desc
);
513 } while ((desc
->istate
& IRQS_PENDING
) &&
514 !irqd_irq_disabled(&desc
->irq_data
));
517 raw_spin_unlock(&desc
->lock
);
520 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
522 * handle_edge_eoi_irq - edge eoi type IRQ handler
523 * @irq: the interrupt number
524 * @desc: the interrupt description structure for this irq
526 * Similar as the above handle_edge_irq, but using eoi and w/o the
529 void handle_edge_eoi_irq(unsigned int irq
, struct irq_desc
*desc
)
531 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
533 raw_spin_lock(&desc
->lock
);
535 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
537 * If we're currently running this IRQ, or its disabled,
538 * we shouldn't process the IRQ. Mark it pending, handle
539 * the necessary masking and go out
541 if (unlikely(irqd_irq_disabled(&desc
->irq_data
) ||
542 irqd_irq_inprogress(&desc
->irq_data
) || !desc
->action
)) {
543 if (!irq_check_poll(desc
)) {
544 desc
->istate
|= IRQS_PENDING
;
548 kstat_incr_irqs_this_cpu(irq
, desc
);
551 if (unlikely(!desc
->action
))
554 handle_irq_event(desc
);
556 } while ((desc
->istate
& IRQS_PENDING
) &&
557 !irqd_irq_disabled(&desc
->irq_data
));
560 chip
->irq_eoi(&desc
->irq_data
);
561 raw_spin_unlock(&desc
->lock
);
566 * handle_percpu_irq - Per CPU local irq handler
567 * @irq: the interrupt number
568 * @desc: the interrupt description structure for this irq
570 * Per CPU interrupts on SMP machines without locking requirements
573 handle_percpu_irq(unsigned int irq
, struct irq_desc
*desc
)
575 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
577 kstat_incr_irqs_this_cpu(irq
, desc
);
580 chip
->irq_ack(&desc
->irq_data
);
582 handle_irq_event_percpu(desc
, desc
->action
);
585 chip
->irq_eoi(&desc
->irq_data
);
589 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
590 * @irq: the interrupt number
591 * @desc: the interrupt description structure for this irq
593 * Per CPU interrupts on SMP machines without locking requirements. Same as
594 * handle_percpu_irq() above but with the following extras:
596 * action->percpu_dev_id is a pointer to percpu variables which
597 * contain the real device id for the cpu on which this handler is
600 void handle_percpu_devid_irq(unsigned int irq
, struct irq_desc
*desc
)
602 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
603 struct irqaction
*action
= desc
->action
;
604 void *dev_id
= __this_cpu_ptr(action
->percpu_dev_id
);
607 kstat_incr_irqs_this_cpu(irq
, desc
);
610 chip
->irq_ack(&desc
->irq_data
);
612 trace_irq_handler_entry(irq
, action
);
613 res
= action
->handler(irq
, dev_id
);
614 trace_irq_handler_exit(irq
, action
, res
);
617 chip
->irq_eoi(&desc
->irq_data
);
621 __irq_set_handler(unsigned int irq
, irq_flow_handler_t handle
, int is_chained
,
625 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, 0);
631 handle
= handle_bad_irq
;
633 if (WARN_ON(desc
->irq_data
.chip
== &no_irq_chip
))
638 if (handle
== handle_bad_irq
) {
639 if (desc
->irq_data
.chip
!= &no_irq_chip
)
641 irq_state_set_disabled(desc
);
644 desc
->handle_irq
= handle
;
647 if (handle
!= handle_bad_irq
&& is_chained
) {
648 irq_settings_set_noprobe(desc
);
649 irq_settings_set_norequest(desc
);
650 irq_settings_set_nothread(desc
);
651 irq_startup(desc
, true);
654 irq_put_desc_busunlock(desc
, flags
);
656 EXPORT_SYMBOL_GPL(__irq_set_handler
);
659 irq_set_chip_and_handler_name(unsigned int irq
, struct irq_chip
*chip
,
660 irq_flow_handler_t handle
, const char *name
)
662 irq_set_chip(irq
, chip
);
663 __irq_set_handler(irq
, handle
, 0, name
);
666 void irq_modify_status(unsigned int irq
, unsigned long clr
, unsigned long set
)
669 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
673 irq_settings_clr_and_set(desc
, clr
, set
);
675 irqd_clear(&desc
->irq_data
, IRQD_NO_BALANCING
| IRQD_PER_CPU
|
676 IRQD_TRIGGER_MASK
| IRQD_LEVEL
| IRQD_MOVE_PCNTXT
);
677 if (irq_settings_has_no_balance_set(desc
))
678 irqd_set(&desc
->irq_data
, IRQD_NO_BALANCING
);
679 if (irq_settings_is_per_cpu(desc
))
680 irqd_set(&desc
->irq_data
, IRQD_PER_CPU
);
681 if (irq_settings_can_move_pcntxt(desc
))
682 irqd_set(&desc
->irq_data
, IRQD_MOVE_PCNTXT
);
683 if (irq_settings_is_level(desc
))
684 irqd_set(&desc
->irq_data
, IRQD_LEVEL
);
686 irqd_set(&desc
->irq_data
, irq_settings_get_trigger_mask(desc
));
688 irq_put_desc_unlock(desc
, flags
);
690 EXPORT_SYMBOL_GPL(irq_modify_status
);
693 * irq_cpu_online - Invoke all irq_cpu_online functions.
695 * Iterate through all irqs and invoke the chip.irq_cpu_online()
698 void irq_cpu_online(void)
700 struct irq_desc
*desc
;
701 struct irq_chip
*chip
;
705 for_each_active_irq(irq
) {
706 desc
= irq_to_desc(irq
);
710 raw_spin_lock_irqsave(&desc
->lock
, flags
);
712 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
713 if (chip
&& chip
->irq_cpu_online
&&
714 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
715 !irqd_irq_disabled(&desc
->irq_data
)))
716 chip
->irq_cpu_online(&desc
->irq_data
);
718 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
723 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
725 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
728 void irq_cpu_offline(void)
730 struct irq_desc
*desc
;
731 struct irq_chip
*chip
;
735 for_each_active_irq(irq
) {
736 desc
= irq_to_desc(irq
);
740 raw_spin_lock_irqsave(&desc
->lock
, flags
);
742 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
743 if (chip
&& chip
->irq_cpu_offline
&&
744 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
745 !irqd_irq_disabled(&desc
->irq_data
)))
746 chip
->irq_cpu_offline(&desc
->irq_data
);
748 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);