Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / kernel / irq / chip.c
blobc69357a43849e1650f347f916b499ba4da47c04b
1 /*
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
8 * based architectures.
10 * Detailed information is available in Documentation/core-api/genericirq.rst
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);
27 return IRQ_NONE;
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,
38 /**
39 * irq_set_chip - set the irq chip for an irq
40 * @irq: irq number
41 * @chip: pointer to irq chip description structure
43 int irq_set_chip(unsigned int irq, struct irq_chip *chip)
45 unsigned long flags;
46 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
48 if (!desc)
49 return -EINVAL;
51 if (!chip)
52 chip = &no_irq_chip;
54 desc->irq_data.chip = chip;
55 irq_put_desc_unlock(desc, flags);
57 * For !CONFIG_SPARSE_IRQ make the irq show up in
58 * allocated_irqs.
60 irq_mark_irq(irq);
61 return 0;
63 EXPORT_SYMBOL(irq_set_chip);
65 /**
66 * irq_set_type - set the irq trigger type for an irq
67 * @irq: irq number
68 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
70 int irq_set_irq_type(unsigned int irq, unsigned int type)
72 unsigned long flags;
73 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
74 int ret = 0;
76 if (!desc)
77 return -EINVAL;
79 ret = __irq_set_trigger(desc, type);
80 irq_put_desc_busunlock(desc, flags);
81 return ret;
83 EXPORT_SYMBOL(irq_set_irq_type);
85 /**
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)
94 unsigned long flags;
95 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
97 if (!desc)
98 return -EINVAL;
99 desc->irq_common_data.handler_data = data;
100 irq_put_desc_unlock(desc, flags);
101 return 0;
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)
116 unsigned long flags;
117 struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
119 if (!desc)
120 return -EINVAL;
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);
125 return 0;
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)
149 unsigned long flags;
150 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
152 if (!desc)
153 return -EINVAL;
154 desc->irq_data.chip_data = data;
155 irq_put_desc_unlock(desc, flags);
156 return 0;
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_clr_masked(struct irq_desc *desc)
175 irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
178 static void irq_state_clr_started(struct irq_desc *desc)
180 irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED);
183 static void irq_state_set_started(struct irq_desc *desc)
185 irqd_set(&desc->irq_data, IRQD_IRQ_STARTED);
188 enum {
189 IRQ_STARTUP_NORMAL,
190 IRQ_STARTUP_MANAGED,
191 IRQ_STARTUP_ABORT,
194 #ifdef CONFIG_SMP
195 static int
196 __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
198 struct irq_data *d = irq_desc_get_irq_data(desc);
200 if (!irqd_affinity_is_managed(d))
201 return IRQ_STARTUP_NORMAL;
203 irqd_clr_managed_shutdown(d);
205 if (cpumask_any_and(aff, cpu_online_mask) >= nr_cpu_ids) {
207 * Catch code which fiddles with enable_irq() on a managed
208 * and potentially shutdown IRQ. Chained interrupt
209 * installment or irq auto probing should not happen on
210 * managed irqs either.
212 if (WARN_ON_ONCE(force))
213 return IRQ_STARTUP_ABORT;
215 * The interrupt was requested, but there is no online CPU
216 * in it's affinity mask. Put it into managed shutdown
217 * state and let the cpu hotplug mechanism start it up once
218 * a CPU in the mask becomes available.
220 return IRQ_STARTUP_ABORT;
223 * Managed interrupts have reserved resources, so this should not
224 * happen.
226 if (WARN_ON(irq_domain_activate_irq(d, false)))
227 return IRQ_STARTUP_ABORT;
228 return IRQ_STARTUP_MANAGED;
230 #else
231 static __always_inline int
232 __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
234 return IRQ_STARTUP_NORMAL;
236 #endif
238 static int __irq_startup(struct irq_desc *desc)
240 struct irq_data *d = irq_desc_get_irq_data(desc);
241 int ret = 0;
243 /* Warn if this interrupt is not activated but try nevertheless */
244 WARN_ON_ONCE(!irqd_is_activated(d));
246 if (d->chip->irq_startup) {
247 ret = d->chip->irq_startup(d);
248 irq_state_clr_disabled(desc);
249 irq_state_clr_masked(desc);
250 } else {
251 irq_enable(desc);
253 irq_state_set_started(desc);
254 return ret;
257 int irq_startup(struct irq_desc *desc, bool resend, bool force)
259 struct irq_data *d = irq_desc_get_irq_data(desc);
260 struct cpumask *aff = irq_data_get_affinity_mask(d);
261 int ret = 0;
263 desc->depth = 0;
265 if (irqd_is_started(d)) {
266 irq_enable(desc);
267 } else {
268 switch (__irq_startup_managed(desc, aff, force)) {
269 case IRQ_STARTUP_NORMAL:
270 ret = __irq_startup(desc);
271 irq_setup_affinity(desc);
272 break;
273 case IRQ_STARTUP_MANAGED:
274 irq_do_set_affinity(d, aff, false);
275 ret = __irq_startup(desc);
276 break;
277 case IRQ_STARTUP_ABORT:
278 irqd_set_managed_shutdown(d);
279 return 0;
282 if (resend)
283 check_irq_resend(desc);
285 return ret;
288 int irq_activate(struct irq_desc *desc)
290 struct irq_data *d = irq_desc_get_irq_data(desc);
292 if (!irqd_affinity_is_managed(d))
293 return irq_domain_activate_irq(d, false);
294 return 0;
297 int irq_activate_and_startup(struct irq_desc *desc, bool resend)
299 if (WARN_ON(irq_activate(desc)))
300 return 0;
301 return irq_startup(desc, resend, IRQ_START_FORCE);
304 static void __irq_disable(struct irq_desc *desc, bool mask);
306 void irq_shutdown(struct irq_desc *desc)
308 if (irqd_is_started(&desc->irq_data)) {
309 desc->depth = 1;
310 if (desc->irq_data.chip->irq_shutdown) {
311 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
312 irq_state_set_disabled(desc);
313 irq_state_set_masked(desc);
314 } else {
315 __irq_disable(desc, true);
317 irq_state_clr_started(desc);
320 * This must be called even if the interrupt was never started up,
321 * because the activation can happen before the interrupt is
322 * available for request/startup. It has it's own state tracking so
323 * it's safe to call it unconditionally.
325 irq_domain_deactivate_irq(&desc->irq_data);
328 void irq_enable(struct irq_desc *desc)
330 if (!irqd_irq_disabled(&desc->irq_data)) {
331 unmask_irq(desc);
332 } else {
333 irq_state_clr_disabled(desc);
334 if (desc->irq_data.chip->irq_enable) {
335 desc->irq_data.chip->irq_enable(&desc->irq_data);
336 irq_state_clr_masked(desc);
337 } else {
338 unmask_irq(desc);
343 static void __irq_disable(struct irq_desc *desc, bool mask)
345 if (irqd_irq_disabled(&desc->irq_data)) {
346 if (mask)
347 mask_irq(desc);
348 } else {
349 irq_state_set_disabled(desc);
350 if (desc->irq_data.chip->irq_disable) {
351 desc->irq_data.chip->irq_disable(&desc->irq_data);
352 irq_state_set_masked(desc);
353 } else if (mask) {
354 mask_irq(desc);
360 * irq_disable - Mark interrupt disabled
361 * @desc: irq descriptor which should be disabled
363 * If the chip does not implement the irq_disable callback, we
364 * use a lazy disable approach. That means we mark the interrupt
365 * disabled, but leave the hardware unmasked. That's an
366 * optimization because we avoid the hardware access for the
367 * common case where no interrupt happens after we marked it
368 * disabled. If an interrupt happens, then the interrupt flow
369 * handler masks the line at the hardware level and marks it
370 * pending.
372 * If the interrupt chip does not implement the irq_disable callback,
373 * a driver can disable the lazy approach for a particular irq line by
374 * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
375 * be used for devices which cannot disable the interrupt at the
376 * device level under certain circumstances and have to use
377 * disable_irq[_nosync] instead.
379 void irq_disable(struct irq_desc *desc)
381 __irq_disable(desc, irq_settings_disable_unlazy(desc));
384 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
386 if (desc->irq_data.chip->irq_enable)
387 desc->irq_data.chip->irq_enable(&desc->irq_data);
388 else
389 desc->irq_data.chip->irq_unmask(&desc->irq_data);
390 cpumask_set_cpu(cpu, desc->percpu_enabled);
393 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
395 if (desc->irq_data.chip->irq_disable)
396 desc->irq_data.chip->irq_disable(&desc->irq_data);
397 else
398 desc->irq_data.chip->irq_mask(&desc->irq_data);
399 cpumask_clear_cpu(cpu, desc->percpu_enabled);
402 static inline void mask_ack_irq(struct irq_desc *desc)
404 if (desc->irq_data.chip->irq_mask_ack) {
405 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
406 irq_state_set_masked(desc);
407 } else {
408 mask_irq(desc);
409 if (desc->irq_data.chip->irq_ack)
410 desc->irq_data.chip->irq_ack(&desc->irq_data);
414 void mask_irq(struct irq_desc *desc)
416 if (irqd_irq_masked(&desc->irq_data))
417 return;
419 if (desc->irq_data.chip->irq_mask) {
420 desc->irq_data.chip->irq_mask(&desc->irq_data);
421 irq_state_set_masked(desc);
425 void unmask_irq(struct irq_desc *desc)
427 if (!irqd_irq_masked(&desc->irq_data))
428 return;
430 if (desc->irq_data.chip->irq_unmask) {
431 desc->irq_data.chip->irq_unmask(&desc->irq_data);
432 irq_state_clr_masked(desc);
436 void unmask_threaded_irq(struct irq_desc *desc)
438 struct irq_chip *chip = desc->irq_data.chip;
440 if (chip->flags & IRQCHIP_EOI_THREADED)
441 chip->irq_eoi(&desc->irq_data);
443 unmask_irq(desc);
447 * handle_nested_irq - Handle a nested irq from a irq thread
448 * @irq: the interrupt number
450 * Handle interrupts which are nested into a threaded interrupt
451 * handler. The handler function is called inside the calling
452 * threads context.
454 void handle_nested_irq(unsigned int irq)
456 struct irq_desc *desc = irq_to_desc(irq);
457 struct irqaction *action;
458 irqreturn_t action_ret;
460 might_sleep();
462 raw_spin_lock_irq(&desc->lock);
464 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
466 action = desc->action;
467 if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
468 desc->istate |= IRQS_PENDING;
469 goto out_unlock;
472 kstat_incr_irqs_this_cpu(desc);
473 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
474 raw_spin_unlock_irq(&desc->lock);
476 action_ret = IRQ_NONE;
477 for_each_action_of_desc(desc, action)
478 action_ret |= action->thread_fn(action->irq, action->dev_id);
480 if (!noirqdebug)
481 note_interrupt(desc, action_ret);
483 raw_spin_lock_irq(&desc->lock);
484 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
486 out_unlock:
487 raw_spin_unlock_irq(&desc->lock);
489 EXPORT_SYMBOL_GPL(handle_nested_irq);
491 static bool irq_check_poll(struct irq_desc *desc)
493 if (!(desc->istate & IRQS_POLL_INPROGRESS))
494 return false;
495 return irq_wait_for_poll(desc);
498 static bool irq_may_run(struct irq_desc *desc)
500 unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
503 * If the interrupt is not in progress and is not an armed
504 * wakeup interrupt, proceed.
506 if (!irqd_has_set(&desc->irq_data, mask))
507 return true;
510 * If the interrupt is an armed wakeup source, mark it pending
511 * and suspended, disable it and notify the pm core about the
512 * event.
514 if (irq_pm_check_wakeup(desc))
515 return false;
518 * Handle a potential concurrent poll on a different core.
520 return irq_check_poll(desc);
524 * handle_simple_irq - Simple and software-decoded IRQs.
525 * @desc: the interrupt description structure for this irq
527 * Simple interrupts are either sent from a demultiplexing interrupt
528 * handler or come from hardware, where no interrupt hardware control
529 * is necessary.
531 * Note: The caller is expected to handle the ack, clear, mask and
532 * unmask issues if necessary.
534 void handle_simple_irq(struct irq_desc *desc)
536 raw_spin_lock(&desc->lock);
538 if (!irq_may_run(desc))
539 goto out_unlock;
541 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
543 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
544 desc->istate |= IRQS_PENDING;
545 goto out_unlock;
548 kstat_incr_irqs_this_cpu(desc);
549 handle_irq_event(desc);
551 out_unlock:
552 raw_spin_unlock(&desc->lock);
554 EXPORT_SYMBOL_GPL(handle_simple_irq);
557 * handle_untracked_irq - Simple and software-decoded IRQs.
558 * @desc: the interrupt description structure for this irq
560 * Untracked interrupts are sent from a demultiplexing interrupt
561 * handler when the demultiplexer does not know which device it its
562 * multiplexed irq domain generated the interrupt. IRQ's handled
563 * through here are not subjected to stats tracking, randomness, or
564 * spurious interrupt detection.
566 * Note: Like handle_simple_irq, the caller is expected to handle
567 * the ack, clear, mask and unmask issues if necessary.
569 void handle_untracked_irq(struct irq_desc *desc)
571 unsigned int flags = 0;
573 raw_spin_lock(&desc->lock);
575 if (!irq_may_run(desc))
576 goto out_unlock;
578 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
580 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
581 desc->istate |= IRQS_PENDING;
582 goto out_unlock;
585 desc->istate &= ~IRQS_PENDING;
586 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
587 raw_spin_unlock(&desc->lock);
589 __handle_irq_event_percpu(desc, &flags);
591 raw_spin_lock(&desc->lock);
592 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
594 out_unlock:
595 raw_spin_unlock(&desc->lock);
597 EXPORT_SYMBOL_GPL(handle_untracked_irq);
600 * Called unconditionally from handle_level_irq() and only for oneshot
601 * interrupts from handle_fasteoi_irq()
603 static void cond_unmask_irq(struct irq_desc *desc)
606 * We need to unmask in the following cases:
607 * - Standard level irq (IRQF_ONESHOT is not set)
608 * - Oneshot irq which did not wake the thread (caused by a
609 * spurious interrupt or a primary handler handling it
610 * completely).
612 if (!irqd_irq_disabled(&desc->irq_data) &&
613 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
614 unmask_irq(desc);
618 * handle_level_irq - Level type irq handler
619 * @desc: the interrupt description structure for this irq
621 * Level type interrupts are active as long as the hardware line has
622 * the active level. This may require to mask the interrupt and unmask
623 * it after the associated handler has acknowledged the device, so the
624 * interrupt line is back to inactive.
626 void handle_level_irq(struct irq_desc *desc)
628 raw_spin_lock(&desc->lock);
629 mask_ack_irq(desc);
631 if (!irq_may_run(desc))
632 goto out_unlock;
634 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
637 * If its disabled or no action available
638 * keep it masked and get out of here
640 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
641 desc->istate |= IRQS_PENDING;
642 goto out_unlock;
645 kstat_incr_irqs_this_cpu(desc);
646 handle_irq_event(desc);
648 cond_unmask_irq(desc);
650 out_unlock:
651 raw_spin_unlock(&desc->lock);
653 EXPORT_SYMBOL_GPL(handle_level_irq);
655 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
656 static inline void preflow_handler(struct irq_desc *desc)
658 if (desc->preflow_handler)
659 desc->preflow_handler(&desc->irq_data);
661 #else
662 static inline void preflow_handler(struct irq_desc *desc) { }
663 #endif
665 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
667 if (!(desc->istate & IRQS_ONESHOT)) {
668 chip->irq_eoi(&desc->irq_data);
669 return;
672 * We need to unmask in the following cases:
673 * - Oneshot irq which did not wake the thread (caused by a
674 * spurious interrupt or a primary handler handling it
675 * completely).
677 if (!irqd_irq_disabled(&desc->irq_data) &&
678 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
679 chip->irq_eoi(&desc->irq_data);
680 unmask_irq(desc);
681 } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
682 chip->irq_eoi(&desc->irq_data);
687 * handle_fasteoi_irq - irq handler for transparent controllers
688 * @desc: the interrupt description structure for this irq
690 * Only a single callback will be issued to the chip: an ->eoi()
691 * call when the interrupt has been serviced. This enables support
692 * for modern forms of interrupt handlers, which handle the flow
693 * details in hardware, transparently.
695 void handle_fasteoi_irq(struct irq_desc *desc)
697 struct irq_chip *chip = desc->irq_data.chip;
699 raw_spin_lock(&desc->lock);
701 if (!irq_may_run(desc))
702 goto out;
704 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
707 * If its disabled or no action available
708 * then mask it and get out of here:
710 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
711 desc->istate |= IRQS_PENDING;
712 mask_irq(desc);
713 goto out;
716 kstat_incr_irqs_this_cpu(desc);
717 if (desc->istate & IRQS_ONESHOT)
718 mask_irq(desc);
720 preflow_handler(desc);
721 handle_irq_event(desc);
723 cond_unmask_eoi_irq(desc, chip);
725 raw_spin_unlock(&desc->lock);
726 return;
727 out:
728 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
729 chip->irq_eoi(&desc->irq_data);
730 raw_spin_unlock(&desc->lock);
732 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
735 * handle_edge_irq - edge type IRQ handler
736 * @desc: the interrupt description structure for this irq
738 * Interrupt occures on the falling and/or rising edge of a hardware
739 * signal. The occurrence is latched into the irq controller hardware
740 * and must be acked in order to be reenabled. After the ack another
741 * interrupt can happen on the same source even before the first one
742 * is handled by the associated event handler. If this happens it
743 * might be necessary to disable (mask) the interrupt depending on the
744 * controller hardware. This requires to reenable the interrupt inside
745 * of the loop which handles the interrupts which have arrived while
746 * the handler was running. If all pending interrupts are handled, the
747 * loop is left.
749 void handle_edge_irq(struct irq_desc *desc)
751 raw_spin_lock(&desc->lock);
753 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
755 if (!irq_may_run(desc)) {
756 desc->istate |= IRQS_PENDING;
757 mask_ack_irq(desc);
758 goto out_unlock;
762 * If its disabled or no action available then mask it and get
763 * out of here.
765 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
766 desc->istate |= IRQS_PENDING;
767 mask_ack_irq(desc);
768 goto out_unlock;
771 kstat_incr_irqs_this_cpu(desc);
773 /* Start handling the irq */
774 desc->irq_data.chip->irq_ack(&desc->irq_data);
776 do {
777 if (unlikely(!desc->action)) {
778 mask_irq(desc);
779 goto out_unlock;
783 * When another irq arrived while we were handling
784 * one, we could have masked the irq.
785 * Renable it, if it was not disabled in meantime.
787 if (unlikely(desc->istate & IRQS_PENDING)) {
788 if (!irqd_irq_disabled(&desc->irq_data) &&
789 irqd_irq_masked(&desc->irq_data))
790 unmask_irq(desc);
793 handle_irq_event(desc);
795 } while ((desc->istate & IRQS_PENDING) &&
796 !irqd_irq_disabled(&desc->irq_data));
798 out_unlock:
799 raw_spin_unlock(&desc->lock);
801 EXPORT_SYMBOL(handle_edge_irq);
803 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
805 * handle_edge_eoi_irq - edge eoi type IRQ handler
806 * @desc: the interrupt description structure for this irq
808 * Similar as the above handle_edge_irq, but using eoi and w/o the
809 * mask/unmask logic.
811 void handle_edge_eoi_irq(struct irq_desc *desc)
813 struct irq_chip *chip = irq_desc_get_chip(desc);
815 raw_spin_lock(&desc->lock);
817 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
819 if (!irq_may_run(desc)) {
820 desc->istate |= IRQS_PENDING;
821 goto out_eoi;
825 * If its disabled or no action available then mask it and get
826 * out of here.
828 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
829 desc->istate |= IRQS_PENDING;
830 goto out_eoi;
833 kstat_incr_irqs_this_cpu(desc);
835 do {
836 if (unlikely(!desc->action))
837 goto out_eoi;
839 handle_irq_event(desc);
841 } while ((desc->istate & IRQS_PENDING) &&
842 !irqd_irq_disabled(&desc->irq_data));
844 out_eoi:
845 chip->irq_eoi(&desc->irq_data);
846 raw_spin_unlock(&desc->lock);
848 #endif
851 * handle_percpu_irq - Per CPU local irq handler
852 * @desc: the interrupt description structure for this irq
854 * Per CPU interrupts on SMP machines without locking requirements
856 void handle_percpu_irq(struct irq_desc *desc)
858 struct irq_chip *chip = irq_desc_get_chip(desc);
860 kstat_incr_irqs_this_cpu(desc);
862 if (chip->irq_ack)
863 chip->irq_ack(&desc->irq_data);
865 handle_irq_event_percpu(desc);
867 if (chip->irq_eoi)
868 chip->irq_eoi(&desc->irq_data);
872 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
873 * @desc: the interrupt description structure for this irq
875 * Per CPU interrupts on SMP machines without locking requirements. Same as
876 * handle_percpu_irq() above but with the following extras:
878 * action->percpu_dev_id is a pointer to percpu variables which
879 * contain the real device id for the cpu on which this handler is
880 * called
882 void handle_percpu_devid_irq(struct irq_desc *desc)
884 struct irq_chip *chip = irq_desc_get_chip(desc);
885 struct irqaction *action = desc->action;
886 unsigned int irq = irq_desc_get_irq(desc);
887 irqreturn_t res;
889 kstat_incr_irqs_this_cpu(desc);
891 if (chip->irq_ack)
892 chip->irq_ack(&desc->irq_data);
894 if (likely(action)) {
895 trace_irq_handler_entry(irq, action);
896 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
897 trace_irq_handler_exit(irq, action, res);
898 } else {
899 unsigned int cpu = smp_processor_id();
900 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
902 if (enabled)
903 irq_percpu_disable(desc, cpu);
905 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
906 enabled ? " and unmasked" : "", irq, cpu);
909 if (chip->irq_eoi)
910 chip->irq_eoi(&desc->irq_data);
913 static void
914 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
915 int is_chained, const char *name)
917 if (!handle) {
918 handle = handle_bad_irq;
919 } else {
920 struct irq_data *irq_data = &desc->irq_data;
921 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
923 * With hierarchical domains we might run into a
924 * situation where the outermost chip is not yet set
925 * up, but the inner chips are there. Instead of
926 * bailing we install the handler, but obviously we
927 * cannot enable/startup the interrupt at this point.
929 while (irq_data) {
930 if (irq_data->chip != &no_irq_chip)
931 break;
933 * Bail out if the outer chip is not set up
934 * and the interrrupt supposed to be started
935 * right away.
937 if (WARN_ON(is_chained))
938 return;
939 /* Try the parent */
940 irq_data = irq_data->parent_data;
942 #endif
943 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
944 return;
947 /* Uninstall? */
948 if (handle == handle_bad_irq) {
949 if (desc->irq_data.chip != &no_irq_chip)
950 mask_ack_irq(desc);
951 irq_state_set_disabled(desc);
952 if (is_chained)
953 desc->action = NULL;
954 desc->depth = 1;
956 desc->handle_irq = handle;
957 desc->name = name;
959 if (handle != handle_bad_irq && is_chained) {
960 unsigned int type = irqd_get_trigger_type(&desc->irq_data);
963 * We're about to start this interrupt immediately,
964 * hence the need to set the trigger configuration.
965 * But the .set_type callback may have overridden the
966 * flow handler, ignoring that we're dealing with a
967 * chained interrupt. Reset it immediately because we
968 * do know better.
970 if (type != IRQ_TYPE_NONE) {
971 __irq_set_trigger(desc, type);
972 desc->handle_irq = handle;
975 irq_settings_set_noprobe(desc);
976 irq_settings_set_norequest(desc);
977 irq_settings_set_nothread(desc);
978 desc->action = &chained_action;
979 irq_activate_and_startup(desc, IRQ_RESEND);
983 void
984 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
985 const char *name)
987 unsigned long flags;
988 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
990 if (!desc)
991 return;
993 __irq_do_set_handler(desc, handle, is_chained, name);
994 irq_put_desc_busunlock(desc, flags);
996 EXPORT_SYMBOL_GPL(__irq_set_handler);
998 void
999 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1000 void *data)
1002 unsigned long flags;
1003 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1005 if (!desc)
1006 return;
1008 desc->irq_common_data.handler_data = data;
1009 __irq_do_set_handler(desc, handle, 1, NULL);
1011 irq_put_desc_busunlock(desc, flags);
1013 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1015 void
1016 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
1017 irq_flow_handler_t handle, const char *name)
1019 irq_set_chip(irq, chip);
1020 __irq_set_handler(irq, handle, 0, name);
1022 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1024 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1026 unsigned long flags, trigger, tmp;
1027 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1029 if (!desc)
1030 return;
1033 * Warn when a driver sets the no autoenable flag on an already
1034 * active interrupt.
1036 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1038 irq_settings_clr_and_set(desc, clr, set);
1040 trigger = irqd_get_trigger_type(&desc->irq_data);
1042 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1043 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1044 if (irq_settings_has_no_balance_set(desc))
1045 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1046 if (irq_settings_is_per_cpu(desc))
1047 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1048 if (irq_settings_can_move_pcntxt(desc))
1049 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1050 if (irq_settings_is_level(desc))
1051 irqd_set(&desc->irq_data, IRQD_LEVEL);
1053 tmp = irq_settings_get_trigger_mask(desc);
1054 if (tmp != IRQ_TYPE_NONE)
1055 trigger = tmp;
1057 irqd_set(&desc->irq_data, trigger);
1059 irq_put_desc_unlock(desc, flags);
1061 EXPORT_SYMBOL_GPL(irq_modify_status);
1064 * irq_cpu_online - Invoke all irq_cpu_online functions.
1066 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1067 * for each.
1069 void irq_cpu_online(void)
1071 struct irq_desc *desc;
1072 struct irq_chip *chip;
1073 unsigned long flags;
1074 unsigned int irq;
1076 for_each_active_irq(irq) {
1077 desc = irq_to_desc(irq);
1078 if (!desc)
1079 continue;
1081 raw_spin_lock_irqsave(&desc->lock, flags);
1083 chip = irq_data_get_irq_chip(&desc->irq_data);
1084 if (chip && chip->irq_cpu_online &&
1085 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1086 !irqd_irq_disabled(&desc->irq_data)))
1087 chip->irq_cpu_online(&desc->irq_data);
1089 raw_spin_unlock_irqrestore(&desc->lock, flags);
1094 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1096 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1097 * for each.
1099 void irq_cpu_offline(void)
1101 struct irq_desc *desc;
1102 struct irq_chip *chip;
1103 unsigned long flags;
1104 unsigned int irq;
1106 for_each_active_irq(irq) {
1107 desc = irq_to_desc(irq);
1108 if (!desc)
1109 continue;
1111 raw_spin_lock_irqsave(&desc->lock, flags);
1113 chip = irq_data_get_irq_chip(&desc->irq_data);
1114 if (chip && chip->irq_cpu_offline &&
1115 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1116 !irqd_irq_disabled(&desc->irq_data)))
1117 chip->irq_cpu_offline(&desc->irq_data);
1119 raw_spin_unlock_irqrestore(&desc->lock, flags);
1123 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1125 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1127 * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1128 * stacked on transparent controllers
1130 * @desc: the interrupt description structure for this irq
1132 * Like handle_fasteoi_irq(), but for use with hierarchy where
1133 * the irq_chip also needs to have its ->irq_ack() function
1134 * called.
1136 void handle_fasteoi_ack_irq(struct irq_desc *desc)
1138 struct irq_chip *chip = desc->irq_data.chip;
1140 raw_spin_lock(&desc->lock);
1142 if (!irq_may_run(desc))
1143 goto out;
1145 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1148 * If its disabled or no action available
1149 * then mask it and get out of here:
1151 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1152 desc->istate |= IRQS_PENDING;
1153 mask_irq(desc);
1154 goto out;
1157 kstat_incr_irqs_this_cpu(desc);
1158 if (desc->istate & IRQS_ONESHOT)
1159 mask_irq(desc);
1161 /* Start handling the irq */
1162 desc->irq_data.chip->irq_ack(&desc->irq_data);
1164 preflow_handler(desc);
1165 handle_irq_event(desc);
1167 cond_unmask_eoi_irq(desc, chip);
1169 raw_spin_unlock(&desc->lock);
1170 return;
1171 out:
1172 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1173 chip->irq_eoi(&desc->irq_data);
1174 raw_spin_unlock(&desc->lock);
1176 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1179 * handle_fasteoi_mask_irq - irq handler for level hierarchy
1180 * stacked on transparent controllers
1182 * @desc: the interrupt description structure for this irq
1184 * Like handle_fasteoi_irq(), but for use with hierarchy where
1185 * the irq_chip also needs to have its ->irq_mask_ack() function
1186 * called.
1188 void handle_fasteoi_mask_irq(struct irq_desc *desc)
1190 struct irq_chip *chip = desc->irq_data.chip;
1192 raw_spin_lock(&desc->lock);
1193 mask_ack_irq(desc);
1195 if (!irq_may_run(desc))
1196 goto out;
1198 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1201 * If its disabled or no action available
1202 * then mask it and get out of here:
1204 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1205 desc->istate |= IRQS_PENDING;
1206 mask_irq(desc);
1207 goto out;
1210 kstat_incr_irqs_this_cpu(desc);
1211 if (desc->istate & IRQS_ONESHOT)
1212 mask_irq(desc);
1214 preflow_handler(desc);
1215 handle_irq_event(desc);
1217 cond_unmask_eoi_irq(desc, chip);
1219 raw_spin_unlock(&desc->lock);
1220 return;
1221 out:
1222 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1223 chip->irq_eoi(&desc->irq_data);
1224 raw_spin_unlock(&desc->lock);
1226 EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1228 #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1231 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1232 * NULL)
1233 * @data: Pointer to interrupt specific data
1235 void irq_chip_enable_parent(struct irq_data *data)
1237 data = data->parent_data;
1238 if (data->chip->irq_enable)
1239 data->chip->irq_enable(data);
1240 else
1241 data->chip->irq_unmask(data);
1243 EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1246 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1247 * NULL)
1248 * @data: Pointer to interrupt specific data
1250 void irq_chip_disable_parent(struct irq_data *data)
1252 data = data->parent_data;
1253 if (data->chip->irq_disable)
1254 data->chip->irq_disable(data);
1255 else
1256 data->chip->irq_mask(data);
1258 EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1261 * irq_chip_ack_parent - Acknowledge the parent interrupt
1262 * @data: Pointer to interrupt specific data
1264 void irq_chip_ack_parent(struct irq_data *data)
1266 data = data->parent_data;
1267 data->chip->irq_ack(data);
1269 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1272 * irq_chip_mask_parent - Mask the parent interrupt
1273 * @data: Pointer to interrupt specific data
1275 void irq_chip_mask_parent(struct irq_data *data)
1277 data = data->parent_data;
1278 data->chip->irq_mask(data);
1280 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1283 * irq_chip_unmask_parent - Unmask the parent interrupt
1284 * @data: Pointer to interrupt specific data
1286 void irq_chip_unmask_parent(struct irq_data *data)
1288 data = data->parent_data;
1289 data->chip->irq_unmask(data);
1291 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1294 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1295 * @data: Pointer to interrupt specific data
1297 void irq_chip_eoi_parent(struct irq_data *data)
1299 data = data->parent_data;
1300 data->chip->irq_eoi(data);
1302 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1305 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1306 * @data: Pointer to interrupt specific data
1307 * @dest: The affinity mask to set
1308 * @force: Flag to enforce setting (disable online checks)
1310 * Conditinal, as the underlying parent chip might not implement it.
1312 int irq_chip_set_affinity_parent(struct irq_data *data,
1313 const struct cpumask *dest, bool force)
1315 data = data->parent_data;
1316 if (data->chip->irq_set_affinity)
1317 return data->chip->irq_set_affinity(data, dest, force);
1319 return -ENOSYS;
1321 EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1324 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1325 * @data: Pointer to interrupt specific data
1326 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1328 * Conditional, as the underlying parent chip might not implement it.
1330 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1332 data = data->parent_data;
1334 if (data->chip->irq_set_type)
1335 return data->chip->irq_set_type(data, type);
1337 return -ENOSYS;
1339 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1342 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1343 * @data: Pointer to interrupt specific data
1345 * Iterate through the domain hierarchy of the interrupt and check
1346 * whether a hw retrigger function exists. If yes, invoke it.
1348 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1350 for (data = data->parent_data; data; data = data->parent_data)
1351 if (data->chip && data->chip->irq_retrigger)
1352 return data->chip->irq_retrigger(data);
1354 return 0;
1358 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1359 * @data: Pointer to interrupt specific data
1360 * @vcpu_info: The vcpu affinity information
1362 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1364 data = data->parent_data;
1365 if (data->chip->irq_set_vcpu_affinity)
1366 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1368 return -ENOSYS;
1372 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1373 * @data: Pointer to interrupt specific data
1374 * @on: Whether to set or reset the wake-up capability of this irq
1376 * Conditional, as the underlying parent chip might not implement it.
1378 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1380 data = data->parent_data;
1381 if (data->chip->irq_set_wake)
1382 return data->chip->irq_set_wake(data, on);
1384 return -ENOSYS;
1386 #endif
1389 * irq_chip_compose_msi_msg - Componse msi message for a irq chip
1390 * @data: Pointer to interrupt specific data
1391 * @msg: Pointer to the MSI message
1393 * For hierarchical domains we find the first chip in the hierarchy
1394 * which implements the irq_compose_msi_msg callback. For non
1395 * hierarchical we use the top level chip.
1397 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1399 struct irq_data *pos = NULL;
1401 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1402 for (; data; data = data->parent_data)
1403 #endif
1404 if (data->chip && data->chip->irq_compose_msi_msg)
1405 pos = data;
1406 if (!pos)
1407 return -ENOSYS;
1409 pos->chip->irq_compose_msi_msg(pos, msg);
1411 return 0;
1415 * irq_chip_pm_get - Enable power for an IRQ chip
1416 * @data: Pointer to interrupt specific data
1418 * Enable the power to the IRQ chip referenced by the interrupt data
1419 * structure.
1421 int irq_chip_pm_get(struct irq_data *data)
1423 int retval;
1425 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
1426 retval = pm_runtime_get_sync(data->chip->parent_device);
1427 if (retval < 0) {
1428 pm_runtime_put_noidle(data->chip->parent_device);
1429 return retval;
1433 return 0;
1437 * irq_chip_pm_put - Disable power for an IRQ chip
1438 * @data: Pointer to interrupt specific data
1440 * Disable the power to the IRQ chip referenced by the interrupt data
1441 * structure, belongs. Note that power will only be disabled, once this
1442 * function has been called for all IRQs that have called irq_chip_pm_get().
1444 int irq_chip_pm_put(struct irq_data *data)
1446 int retval = 0;
1448 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
1449 retval = pm_runtime_put(data->chip->parent_device);
1451 return (retval < 0) ? retval : 0;