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 if (type
!= IRQ_TYPE_NONE
)
65 ret
= __irq_set_trigger(desc
, irq
, type
);
66 irq_put_desc_busunlock(desc
, flags
);
69 EXPORT_SYMBOL(irq_set_irq_type
);
72 * irq_set_handler_data - set irq handler data for an irq
73 * @irq: Interrupt number
74 * @data: Pointer to interrupt specific data
76 * Set the hardware irq controller data for an irq
78 int irq_set_handler_data(unsigned int irq
, void *data
)
81 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
85 desc
->irq_data
.handler_data
= data
;
86 irq_put_desc_unlock(desc
, flags
);
89 EXPORT_SYMBOL(irq_set_handler_data
);
92 * irq_set_msi_desc - set MSI descriptor data for an irq
93 * @irq: Interrupt number
94 * @entry: Pointer to MSI descriptor data
96 * Set the MSI descriptor entry for an irq
98 int irq_set_msi_desc(unsigned int irq
, struct msi_desc
*entry
)
101 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, IRQ_GET_DESC_CHECK_GLOBAL
);
105 desc
->irq_data
.msi_desc
= entry
;
108 irq_put_desc_unlock(desc
, flags
);
113 * irq_set_chip_data - set irq chip data for an irq
114 * @irq: Interrupt number
115 * @data: Pointer to chip specific data
117 * Set the hardware irq chip data for an irq
119 int irq_set_chip_data(unsigned int irq
, void *data
)
122 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
126 desc
->irq_data
.chip_data
= data
;
127 irq_put_desc_unlock(desc
, flags
);
130 EXPORT_SYMBOL(irq_set_chip_data
);
132 struct irq_data
*irq_get_irq_data(unsigned int irq
)
134 struct irq_desc
*desc
= irq_to_desc(irq
);
136 return desc
? &desc
->irq_data
: NULL
;
138 EXPORT_SYMBOL_GPL(irq_get_irq_data
);
140 static void irq_state_clr_disabled(struct irq_desc
*desc
)
142 irqd_clear(&desc
->irq_data
, IRQD_IRQ_DISABLED
);
145 static void irq_state_set_disabled(struct irq_desc
*desc
)
147 irqd_set(&desc
->irq_data
, IRQD_IRQ_DISABLED
);
150 static void irq_state_clr_masked(struct irq_desc
*desc
)
152 irqd_clear(&desc
->irq_data
, IRQD_IRQ_MASKED
);
155 static void irq_state_set_masked(struct irq_desc
*desc
)
157 irqd_set(&desc
->irq_data
, IRQD_IRQ_MASKED
);
160 int irq_startup(struct irq_desc
*desc
, bool resend
)
164 irq_state_clr_disabled(desc
);
167 if (desc
->irq_data
.chip
->irq_startup
) {
168 ret
= desc
->irq_data
.chip
->irq_startup(&desc
->irq_data
);
169 irq_state_clr_masked(desc
);
174 check_irq_resend(desc
, desc
->irq_data
.irq
);
178 void irq_shutdown(struct irq_desc
*desc
)
180 irq_state_set_disabled(desc
);
182 if (desc
->irq_data
.chip
->irq_shutdown
)
183 desc
->irq_data
.chip
->irq_shutdown(&desc
->irq_data
);
184 else if (desc
->irq_data
.chip
->irq_disable
)
185 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
187 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
188 irq_state_set_masked(desc
);
191 void irq_enable(struct irq_desc
*desc
)
193 irq_state_clr_disabled(desc
);
194 if (desc
->irq_data
.chip
->irq_enable
)
195 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
197 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
198 irq_state_clr_masked(desc
);
201 void irq_disable(struct irq_desc
*desc
)
203 irq_state_set_disabled(desc
);
204 if (desc
->irq_data
.chip
->irq_disable
) {
205 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
206 irq_state_set_masked(desc
);
210 void irq_percpu_enable(struct irq_desc
*desc
, unsigned int cpu
)
212 if (desc
->irq_data
.chip
->irq_enable
)
213 desc
->irq_data
.chip
->irq_enable(&desc
->irq_data
);
215 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
216 cpumask_set_cpu(cpu
, desc
->percpu_enabled
);
219 void irq_percpu_disable(struct irq_desc
*desc
, unsigned int cpu
)
221 if (desc
->irq_data
.chip
->irq_disable
)
222 desc
->irq_data
.chip
->irq_disable(&desc
->irq_data
);
224 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
225 cpumask_clear_cpu(cpu
, desc
->percpu_enabled
);
228 static inline void mask_ack_irq(struct irq_desc
*desc
)
230 if (desc
->irq_data
.chip
->irq_mask_ack
)
231 desc
->irq_data
.chip
->irq_mask_ack(&desc
->irq_data
);
233 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
234 if (desc
->irq_data
.chip
->irq_ack
)
235 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
237 irq_state_set_masked(desc
);
240 void mask_irq(struct irq_desc
*desc
)
242 if (desc
->irq_data
.chip
->irq_mask
) {
243 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
244 irq_state_set_masked(desc
);
248 void unmask_irq(struct irq_desc
*desc
)
250 if (desc
->irq_data
.chip
->irq_unmask
) {
251 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
252 irq_state_clr_masked(desc
);
257 * handle_nested_irq - Handle a nested irq from a irq thread
258 * @irq: the interrupt number
260 * Handle interrupts which are nested into a threaded interrupt
261 * handler. The handler function is called inside the calling
264 void handle_nested_irq(unsigned int irq
)
266 struct irq_desc
*desc
= irq_to_desc(irq
);
267 struct irqaction
*action
;
268 irqreturn_t action_ret
;
272 raw_spin_lock_irq(&desc
->lock
);
274 kstat_incr_irqs_this_cpu(irq
, desc
);
276 action
= desc
->action
;
277 if (unlikely(!action
|| irqd_irq_disabled(&desc
->irq_data
)))
280 irqd_set(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
281 raw_spin_unlock_irq(&desc
->lock
);
283 action_ret
= action
->thread_fn(action
->irq
, action
->dev_id
);
285 note_interrupt(irq
, desc
, action_ret
);
287 raw_spin_lock_irq(&desc
->lock
);
288 irqd_clear(&desc
->irq_data
, IRQD_IRQ_INPROGRESS
);
291 raw_spin_unlock_irq(&desc
->lock
);
293 EXPORT_SYMBOL_GPL(handle_nested_irq
);
295 static bool irq_check_poll(struct irq_desc
*desc
)
297 if (!(desc
->istate
& IRQS_POLL_INPROGRESS
))
299 return irq_wait_for_poll(desc
);
303 * handle_simple_irq - Simple and software-decoded IRQs.
304 * @irq: the interrupt number
305 * @desc: the interrupt description structure for this irq
307 * Simple interrupts are either sent from a demultiplexing interrupt
308 * handler or come from hardware, where no interrupt hardware control
311 * Note: The caller is expected to handle the ack, clear, mask and
312 * unmask issues if necessary.
315 handle_simple_irq(unsigned int irq
, struct irq_desc
*desc
)
317 raw_spin_lock(&desc
->lock
);
319 if (unlikely(irqd_irq_inprogress(&desc
->irq_data
)))
320 if (!irq_check_poll(desc
))
323 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
324 kstat_incr_irqs_this_cpu(irq
, desc
);
326 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
)))
329 handle_irq_event(desc
);
332 raw_spin_unlock(&desc
->lock
);
334 EXPORT_SYMBOL_GPL(handle_simple_irq
);
337 * Called unconditionally from handle_level_irq() and only for oneshot
338 * interrupts from handle_fasteoi_irq()
340 static void cond_unmask_irq(struct irq_desc
*desc
)
343 * We need to unmask in the following cases:
344 * - Standard level irq (IRQF_ONESHOT is not set)
345 * - Oneshot irq which did not wake the thread (caused by a
346 * spurious interrupt or a primary handler handling it
349 if (!irqd_irq_disabled(&desc
->irq_data
) &&
350 irqd_irq_masked(&desc
->irq_data
) && !desc
->threads_oneshot
)
355 * handle_level_irq - Level type irq handler
356 * @irq: the interrupt number
357 * @desc: the interrupt description structure for this irq
359 * Level type interrupts are active as long as the hardware line has
360 * the active level. This may require to mask the interrupt and unmask
361 * it after the associated handler has acknowledged the device, so the
362 * interrupt line is back to inactive.
365 handle_level_irq(unsigned int irq
, struct irq_desc
*desc
)
367 raw_spin_lock(&desc
->lock
);
370 if (unlikely(irqd_irq_inprogress(&desc
->irq_data
)))
371 if (!irq_check_poll(desc
))
374 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
375 kstat_incr_irqs_this_cpu(irq
, desc
);
378 * If its disabled or no action available
379 * keep it masked and get out of here
381 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
)))
384 handle_irq_event(desc
);
386 cond_unmask_irq(desc
);
389 raw_spin_unlock(&desc
->lock
);
391 EXPORT_SYMBOL_GPL(handle_level_irq
);
393 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
394 static inline void preflow_handler(struct irq_desc
*desc
)
396 if (desc
->preflow_handler
)
397 desc
->preflow_handler(&desc
->irq_data
);
400 static inline void preflow_handler(struct irq_desc
*desc
) { }
404 * handle_fasteoi_irq - irq handler for transparent controllers
405 * @irq: the interrupt number
406 * @desc: the interrupt description structure for this irq
408 * Only a single callback will be issued to the chip: an ->eoi()
409 * call when the interrupt has been serviced. This enables support
410 * for modern forms of interrupt handlers, which handle the flow
411 * details in hardware, transparently.
414 handle_fasteoi_irq(unsigned int irq
, struct irq_desc
*desc
)
416 raw_spin_lock(&desc
->lock
);
418 if (unlikely(irqd_irq_inprogress(&desc
->irq_data
)))
419 if (!irq_check_poll(desc
))
422 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
423 kstat_incr_irqs_this_cpu(irq
, desc
);
426 * If its disabled or no action available
427 * then mask it and get out of here:
429 if (unlikely(!desc
->action
|| irqd_irq_disabled(&desc
->irq_data
))) {
430 desc
->istate
|= IRQS_PENDING
;
435 if (desc
->istate
& IRQS_ONESHOT
)
438 preflow_handler(desc
);
439 handle_irq_event(desc
);
441 if (desc
->istate
& IRQS_ONESHOT
)
442 cond_unmask_irq(desc
);
445 desc
->irq_data
.chip
->irq_eoi(&desc
->irq_data
);
447 raw_spin_unlock(&desc
->lock
);
450 if (!(desc
->irq_data
.chip
->flags
& IRQCHIP_EOI_IF_HANDLED
))
456 * handle_edge_irq - edge type IRQ handler
457 * @irq: the interrupt number
458 * @desc: the interrupt description structure for this irq
460 * Interrupt occures on the falling and/or rising edge of a hardware
461 * signal. The occurrence is latched into the irq controller hardware
462 * and must be acked in order to be reenabled. After the ack another
463 * interrupt can happen on the same source even before the first one
464 * is handled by the associated event handler. If this happens it
465 * might be necessary to disable (mask) the interrupt depending on the
466 * controller hardware. This requires to reenable the interrupt inside
467 * of the loop which handles the interrupts which have arrived while
468 * the handler was running. If all pending interrupts are handled, the
472 handle_edge_irq(unsigned int irq
, struct irq_desc
*desc
)
474 raw_spin_lock(&desc
->lock
);
476 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
478 * If we're currently running this IRQ, or its disabled,
479 * we shouldn't process the IRQ. Mark it pending, handle
480 * the necessary masking and go out
482 if (unlikely(irqd_irq_disabled(&desc
->irq_data
) ||
483 irqd_irq_inprogress(&desc
->irq_data
) || !desc
->action
)) {
484 if (!irq_check_poll(desc
)) {
485 desc
->istate
|= IRQS_PENDING
;
490 kstat_incr_irqs_this_cpu(irq
, desc
);
492 /* Start handling the irq */
493 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
496 if (unlikely(!desc
->action
)) {
502 * When another irq arrived while we were handling
503 * one, we could have masked the irq.
504 * Renable it, if it was not disabled in meantime.
506 if (unlikely(desc
->istate
& IRQS_PENDING
)) {
507 if (!irqd_irq_disabled(&desc
->irq_data
) &&
508 irqd_irq_masked(&desc
->irq_data
))
512 handle_irq_event(desc
);
514 } while ((desc
->istate
& IRQS_PENDING
) &&
515 !irqd_irq_disabled(&desc
->irq_data
));
518 raw_spin_unlock(&desc
->lock
);
521 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
523 * handle_edge_eoi_irq - edge eoi type IRQ handler
524 * @irq: the interrupt number
525 * @desc: the interrupt description structure for this irq
527 * Similar as the above handle_edge_irq, but using eoi and w/o the
530 void handle_edge_eoi_irq(unsigned int irq
, struct irq_desc
*desc
)
532 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
534 raw_spin_lock(&desc
->lock
);
536 desc
->istate
&= ~(IRQS_REPLAY
| IRQS_WAITING
);
538 * If we're currently running this IRQ, or its disabled,
539 * we shouldn't process the IRQ. Mark it pending, handle
540 * the necessary masking and go out
542 if (unlikely(irqd_irq_disabled(&desc
->irq_data
) ||
543 irqd_irq_inprogress(&desc
->irq_data
) || !desc
->action
)) {
544 if (!irq_check_poll(desc
)) {
545 desc
->istate
|= IRQS_PENDING
;
549 kstat_incr_irqs_this_cpu(irq
, desc
);
552 if (unlikely(!desc
->action
))
555 handle_irq_event(desc
);
557 } while ((desc
->istate
& IRQS_PENDING
) &&
558 !irqd_irq_disabled(&desc
->irq_data
));
561 chip
->irq_eoi(&desc
->irq_data
);
562 raw_spin_unlock(&desc
->lock
);
567 * handle_percpu_irq - Per CPU local irq handler
568 * @irq: the interrupt number
569 * @desc: the interrupt description structure for this irq
571 * Per CPU interrupts on SMP machines without locking requirements
574 handle_percpu_irq(unsigned int irq
, struct irq_desc
*desc
)
576 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
578 kstat_incr_irqs_this_cpu(irq
, desc
);
581 chip
->irq_ack(&desc
->irq_data
);
583 handle_irq_event_percpu(desc
, desc
->action
);
586 chip
->irq_eoi(&desc
->irq_data
);
590 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
591 * @irq: the interrupt number
592 * @desc: the interrupt description structure for this irq
594 * Per CPU interrupts on SMP machines without locking requirements. Same as
595 * handle_percpu_irq() above but with the following extras:
597 * action->percpu_dev_id is a pointer to percpu variables which
598 * contain the real device id for the cpu on which this handler is
601 void handle_percpu_devid_irq(unsigned int irq
, struct irq_desc
*desc
)
603 struct irq_chip
*chip
= irq_desc_get_chip(desc
);
604 struct irqaction
*action
= desc
->action
;
605 void *dev_id
= __this_cpu_ptr(action
->percpu_dev_id
);
608 kstat_incr_irqs_this_cpu(irq
, desc
);
611 chip
->irq_ack(&desc
->irq_data
);
613 trace_irq_handler_entry(irq
, action
);
614 res
= action
->handler(irq
, dev_id
);
615 trace_irq_handler_exit(irq
, action
, res
);
618 chip
->irq_eoi(&desc
->irq_data
);
622 __irq_set_handler(unsigned int irq
, irq_flow_handler_t handle
, int is_chained
,
626 struct irq_desc
*desc
= irq_get_desc_buslock(irq
, &flags
, 0);
632 handle
= handle_bad_irq
;
634 if (WARN_ON(desc
->irq_data
.chip
== &no_irq_chip
))
639 if (handle
== handle_bad_irq
) {
640 if (desc
->irq_data
.chip
!= &no_irq_chip
)
642 irq_state_set_disabled(desc
);
645 desc
->handle_irq
= handle
;
648 if (handle
!= handle_bad_irq
&& is_chained
) {
649 irq_settings_set_noprobe(desc
);
650 irq_settings_set_norequest(desc
);
651 irq_settings_set_nothread(desc
);
652 irq_startup(desc
, true);
655 irq_put_desc_busunlock(desc
, flags
);
657 EXPORT_SYMBOL_GPL(__irq_set_handler
);
660 irq_set_chip_and_handler_name(unsigned int irq
, struct irq_chip
*chip
,
661 irq_flow_handler_t handle
, const char *name
)
663 irq_set_chip(irq
, chip
);
664 __irq_set_handler(irq
, handle
, 0, name
);
667 void irq_modify_status(unsigned int irq
, unsigned long clr
, unsigned long set
)
670 struct irq_desc
*desc
= irq_get_desc_lock(irq
, &flags
, 0);
674 irq_settings_clr_and_set(desc
, clr
, set
);
676 irqd_clear(&desc
->irq_data
, IRQD_NO_BALANCING
| IRQD_PER_CPU
|
677 IRQD_TRIGGER_MASK
| IRQD_LEVEL
| IRQD_MOVE_PCNTXT
);
678 if (irq_settings_has_no_balance_set(desc
))
679 irqd_set(&desc
->irq_data
, IRQD_NO_BALANCING
);
680 if (irq_settings_is_per_cpu(desc
))
681 irqd_set(&desc
->irq_data
, IRQD_PER_CPU
);
682 if (irq_settings_can_move_pcntxt(desc
))
683 irqd_set(&desc
->irq_data
, IRQD_MOVE_PCNTXT
);
684 if (irq_settings_is_level(desc
))
685 irqd_set(&desc
->irq_data
, IRQD_LEVEL
);
687 irqd_set(&desc
->irq_data
, irq_settings_get_trigger_mask(desc
));
689 irq_put_desc_unlock(desc
, flags
);
691 EXPORT_SYMBOL_GPL(irq_modify_status
);
694 * irq_cpu_online - Invoke all irq_cpu_online functions.
696 * Iterate through all irqs and invoke the chip.irq_cpu_online()
699 void irq_cpu_online(void)
701 struct irq_desc
*desc
;
702 struct irq_chip
*chip
;
706 for_each_active_irq(irq
) {
707 desc
= irq_to_desc(irq
);
711 raw_spin_lock_irqsave(&desc
->lock
, flags
);
713 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
714 if (chip
&& chip
->irq_cpu_online
&&
715 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
716 !irqd_irq_disabled(&desc
->irq_data
)))
717 chip
->irq_cpu_online(&desc
->irq_data
);
719 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
724 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
726 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
729 void irq_cpu_offline(void)
731 struct irq_desc
*desc
;
732 struct irq_chip
*chip
;
736 for_each_active_irq(irq
) {
737 desc
= irq_to_desc(irq
);
741 raw_spin_lock_irqsave(&desc
->lock
, flags
);
743 chip
= irq_data_get_irq_chip(&desc
->irq_data
);
744 if (chip
&& chip
->irq_cpu_offline
&&
745 (!(chip
->flags
& IRQCHIP_ONOFFLINE_ENABLED
) ||
746 !irqd_irq_disabled(&desc
->irq_data
)))
747 chip
->irq_cpu_offline(&desc
->irq_data
);
749 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);