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/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);
31 * Chained handlers should never call action on their IRQ. This default
32 * action will emit warning if such thing happens.
34 struct irqaction chained_action = {
35 .handler = bad_chained_irq,
39 * irq_set_chip - set the irq chip for an irq
41 * @chip: pointer to irq chip description structure
43 int irq_set_chip(unsigned int irq, struct irq_chip *chip)
46 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
54 desc->irq_data.chip = chip;
55 irq_put_desc_unlock(desc, flags);
57 * For !CONFIG_SPARSE_IRQ make the irq show up in
63 EXPORT_SYMBOL(irq_set_chip);
66 * irq_set_type - set the irq trigger type for an irq
68 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
70 int irq_set_irq_type(unsigned int irq, unsigned int type)
73 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
79 ret = __irq_set_trigger(desc, type);
80 irq_put_desc_busunlock(desc, flags);
83 EXPORT_SYMBOL(irq_set_irq_type);
86 * irq_set_handler_data - set irq handler data for an irq
87 * @irq: Interrupt number
88 * @data: Pointer to interrupt specific data
90 * Set the hardware irq controller data for an irq
92 int irq_set_handler_data(unsigned int irq, void *data)
95 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
99 desc->irq_common_data.handler_data = data;
100 irq_put_desc_unlock(desc, flags);
103 EXPORT_SYMBOL(irq_set_handler_data);
106 * irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
107 * @irq_base: Interrupt number base
108 * @irq_offset: Interrupt number offset
109 * @entry: Pointer to MSI descriptor data
111 * Set the MSI descriptor entry for an irq at offset
113 int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
114 struct msi_desc *entry)
117 struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
121 desc->irq_common_data.msi_desc = entry;
122 if (entry && !irq_offset)
123 entry->irq = irq_base;
124 irq_put_desc_unlock(desc, flags);
129 * irq_set_msi_desc - set MSI descriptor data for an irq
130 * @irq: Interrupt number
131 * @entry: Pointer to MSI descriptor data
133 * Set the MSI descriptor entry for an irq
135 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
137 return irq_set_msi_desc_off(irq, 0, entry);
141 * irq_set_chip_data - set irq chip data for an irq
142 * @irq: Interrupt number
143 * @data: Pointer to chip specific data
145 * Set the hardware irq chip data for an irq
147 int irq_set_chip_data(unsigned int irq, void *data)
150 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
154 desc->irq_data.chip_data = data;
155 irq_put_desc_unlock(desc, flags);
158 EXPORT_SYMBOL(irq_set_chip_data);
160 struct irq_data *irq_get_irq_data(unsigned int irq)
162 struct irq_desc *desc = irq_to_desc(irq);
164 return desc ? &desc->irq_data : NULL;
166 EXPORT_SYMBOL_GPL(irq_get_irq_data);
168 static void irq_state_clr_disabled(struct irq_desc *desc)
170 irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
173 static void irq_state_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);
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. Emit a warning, break the affinity
211 * and start it up as a normal interrupt.
213 if (WARN_ON_ONCE(force))
214 return IRQ_STARTUP_NORMAL;
216 * The interrupt was requested, but there is no online CPU
217 * in it's affinity mask. Put it into managed shutdown
218 * state and let the cpu hotplug mechanism start it up once
219 * a CPU in the mask becomes available.
221 irqd_set_managed_shutdown(d);
222 return IRQ_STARTUP_ABORT;
224 return IRQ_STARTUP_MANAGED;
227 static __always_inline int
228 __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
230 return IRQ_STARTUP_NORMAL;
234 static int __irq_startup(struct irq_desc *desc)
236 struct irq_data *d = irq_desc_get_irq_data(desc);
239 irq_domain_activate_irq(d);
240 if (d->chip->irq_startup) {
241 ret = d->chip->irq_startup(d);
242 irq_state_clr_disabled(desc);
243 irq_state_clr_masked(desc);
247 irq_state_set_started(desc);
251 int irq_startup(struct irq_desc *desc, bool resend, bool force)
253 struct irq_data *d = irq_desc_get_irq_data(desc);
254 struct cpumask *aff = irq_data_get_affinity_mask(d);
259 if (irqd_is_started(d)) {
262 switch (__irq_startup_managed(desc, aff, force)) {
263 case IRQ_STARTUP_NORMAL:
264 ret = __irq_startup(desc);
265 irq_setup_affinity(desc);
267 case IRQ_STARTUP_MANAGED:
268 ret = __irq_startup(desc);
269 irq_set_affinity_locked(d, aff, false);
271 case IRQ_STARTUP_ABORT:
276 check_irq_resend(desc);
281 static void __irq_disable(struct irq_desc *desc, bool mask);
283 void irq_shutdown(struct irq_desc *desc)
285 if (irqd_is_started(&desc->irq_data)) {
287 if (desc->irq_data.chip->irq_shutdown) {
288 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
289 irq_state_set_disabled(desc);
290 irq_state_set_masked(desc);
292 __irq_disable(desc, true);
294 irq_state_clr_started(desc);
297 * This must be called even if the interrupt was never started up,
298 * because the activation can happen before the interrupt is
299 * available for request/startup. It has it's own state tracking so
300 * it's safe to call it unconditionally.
302 irq_domain_deactivate_irq(&desc->irq_data);
305 void irq_enable(struct irq_desc *desc)
307 if (!irqd_irq_disabled(&desc->irq_data)) {
310 irq_state_clr_disabled(desc);
311 if (desc->irq_data.chip->irq_enable) {
312 desc->irq_data.chip->irq_enable(&desc->irq_data);
313 irq_state_clr_masked(desc);
320 static void __irq_disable(struct irq_desc *desc, bool mask)
322 if (irqd_irq_disabled(&desc->irq_data)) {
326 irq_state_set_disabled(desc);
327 if (desc->irq_data.chip->irq_disable) {
328 desc->irq_data.chip->irq_disable(&desc->irq_data);
329 irq_state_set_masked(desc);
337 * irq_disable - Mark interrupt disabled
338 * @desc: irq descriptor which should be disabled
340 * If the chip does not implement the irq_disable callback, we
341 * use a lazy disable approach. That means we mark the interrupt
342 * disabled, but leave the hardware unmasked. That's an
343 * optimization because we avoid the hardware access for the
344 * common case where no interrupt happens after we marked it
345 * disabled. If an interrupt happens, then the interrupt flow
346 * handler masks the line at the hardware level and marks it
349 * If the interrupt chip does not implement the irq_disable callback,
350 * a driver can disable the lazy approach for a particular irq line by
351 * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
352 * be used for devices which cannot disable the interrupt at the
353 * device level under certain circumstances and have to use
354 * disable_irq[_nosync] instead.
356 void irq_disable(struct irq_desc *desc)
358 __irq_disable(desc, irq_settings_disable_unlazy(desc));
361 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
363 if (desc->irq_data.chip->irq_enable)
364 desc->irq_data.chip->irq_enable(&desc->irq_data);
366 desc->irq_data.chip->irq_unmask(&desc->irq_data);
367 cpumask_set_cpu(cpu, desc->percpu_enabled);
370 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
372 if (desc->irq_data.chip->irq_disable)
373 desc->irq_data.chip->irq_disable(&desc->irq_data);
375 desc->irq_data.chip->irq_mask(&desc->irq_data);
376 cpumask_clear_cpu(cpu, desc->percpu_enabled);
379 static inline void mask_ack_irq(struct irq_desc *desc)
381 if (desc->irq_data.chip->irq_mask_ack) {
382 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
383 irq_state_set_masked(desc);
386 if (desc->irq_data.chip->irq_ack)
387 desc->irq_data.chip->irq_ack(&desc->irq_data);
391 void mask_irq(struct irq_desc *desc)
393 if (irqd_irq_masked(&desc->irq_data))
396 if (desc->irq_data.chip->irq_mask) {
397 desc->irq_data.chip->irq_mask(&desc->irq_data);
398 irq_state_set_masked(desc);
402 void unmask_irq(struct irq_desc *desc)
404 if (!irqd_irq_masked(&desc->irq_data))
407 if (desc->irq_data.chip->irq_unmask) {
408 desc->irq_data.chip->irq_unmask(&desc->irq_data);
409 irq_state_clr_masked(desc);
413 void unmask_threaded_irq(struct irq_desc *desc)
415 struct irq_chip *chip = desc->irq_data.chip;
417 if (chip->flags & IRQCHIP_EOI_THREADED)
418 chip->irq_eoi(&desc->irq_data);
424 * handle_nested_irq - Handle a nested irq from a irq thread
425 * @irq: the interrupt number
427 * Handle interrupts which are nested into a threaded interrupt
428 * handler. The handler function is called inside the calling
431 void handle_nested_irq(unsigned int irq)
433 struct irq_desc *desc = irq_to_desc(irq);
434 struct irqaction *action;
435 irqreturn_t action_ret;
439 raw_spin_lock_irq(&desc->lock);
441 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
443 action = desc->action;
444 if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
445 desc->istate |= IRQS_PENDING;
449 kstat_incr_irqs_this_cpu(desc);
450 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
451 raw_spin_unlock_irq(&desc->lock);
453 action_ret = IRQ_NONE;
454 for_each_action_of_desc(desc, action)
455 action_ret |= action->thread_fn(action->irq, action->dev_id);
458 note_interrupt(desc, action_ret);
460 raw_spin_lock_irq(&desc->lock);
461 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
464 raw_spin_unlock_irq(&desc->lock);
466 EXPORT_SYMBOL_GPL(handle_nested_irq);
468 static bool irq_check_poll(struct irq_desc *desc)
470 if (!(desc->istate & IRQS_POLL_INPROGRESS))
472 return irq_wait_for_poll(desc);
475 static bool irq_may_run(struct irq_desc *desc)
477 unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
480 * If the interrupt is not in progress and is not an armed
481 * wakeup interrupt, proceed.
483 if (!irqd_has_set(&desc->irq_data, mask))
487 * If the interrupt is an armed wakeup source, mark it pending
488 * and suspended, disable it and notify the pm core about the
491 if (irq_pm_check_wakeup(desc))
495 * Handle a potential concurrent poll on a different core.
497 return irq_check_poll(desc);
501 * handle_simple_irq - Simple and software-decoded IRQs.
502 * @desc: the interrupt description structure for this irq
504 * Simple interrupts are either sent from a demultiplexing interrupt
505 * handler or come from hardware, where no interrupt hardware control
508 * Note: The caller is expected to handle the ack, clear, mask and
509 * unmask issues if necessary.
511 void handle_simple_irq(struct irq_desc *desc)
513 raw_spin_lock(&desc->lock);
515 if (!irq_may_run(desc))
518 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
520 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
521 desc->istate |= IRQS_PENDING;
525 kstat_incr_irqs_this_cpu(desc);
526 handle_irq_event(desc);
529 raw_spin_unlock(&desc->lock);
531 EXPORT_SYMBOL_GPL(handle_simple_irq);
534 * handle_untracked_irq - Simple and software-decoded IRQs.
535 * @desc: the interrupt description structure for this irq
537 * Untracked interrupts are sent from a demultiplexing interrupt
538 * handler when the demultiplexer does not know which device it its
539 * multiplexed irq domain generated the interrupt. IRQ's handled
540 * through here are not subjected to stats tracking, randomness, or
541 * spurious interrupt detection.
543 * Note: Like handle_simple_irq, the caller is expected to handle
544 * the ack, clear, mask and unmask issues if necessary.
546 void handle_untracked_irq(struct irq_desc *desc)
548 unsigned int flags = 0;
550 raw_spin_lock(&desc->lock);
552 if (!irq_may_run(desc))
555 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
557 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
558 desc->istate |= IRQS_PENDING;
562 desc->istate &= ~IRQS_PENDING;
563 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
564 raw_spin_unlock(&desc->lock);
566 __handle_irq_event_percpu(desc, &flags);
568 raw_spin_lock(&desc->lock);
569 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
572 raw_spin_unlock(&desc->lock);
574 EXPORT_SYMBOL_GPL(handle_untracked_irq);
577 * Called unconditionally from handle_level_irq() and only for oneshot
578 * interrupts from handle_fasteoi_irq()
580 static void cond_unmask_irq(struct irq_desc *desc)
583 * We need to unmask in the following cases:
584 * - Standard level irq (IRQF_ONESHOT is not set)
585 * - Oneshot irq which did not wake the thread (caused by a
586 * spurious interrupt or a primary handler handling it
589 if (!irqd_irq_disabled(&desc->irq_data) &&
590 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
595 * handle_level_irq - Level type irq handler
596 * @desc: the interrupt description structure for this irq
598 * Level type interrupts are active as long as the hardware line has
599 * the active level. This may require to mask the interrupt and unmask
600 * it after the associated handler has acknowledged the device, so the
601 * interrupt line is back to inactive.
603 void handle_level_irq(struct irq_desc *desc)
605 raw_spin_lock(&desc->lock);
608 if (!irq_may_run(desc))
611 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
614 * If its disabled or no action available
615 * keep it masked and get out of here
617 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
618 desc->istate |= IRQS_PENDING;
622 kstat_incr_irqs_this_cpu(desc);
623 handle_irq_event(desc);
625 cond_unmask_irq(desc);
628 raw_spin_unlock(&desc->lock);
630 EXPORT_SYMBOL_GPL(handle_level_irq);
632 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
633 static inline void preflow_handler(struct irq_desc *desc)
635 if (desc->preflow_handler)
636 desc->preflow_handler(&desc->irq_data);
639 static inline void preflow_handler(struct irq_desc *desc) { }
642 static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
644 if (!(desc->istate & IRQS_ONESHOT)) {
645 chip->irq_eoi(&desc->irq_data);
649 * We need to unmask in the following cases:
650 * - Oneshot irq which did not wake the thread (caused by a
651 * spurious interrupt or a primary handler handling it
654 if (!irqd_irq_disabled(&desc->irq_data) &&
655 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
656 chip->irq_eoi(&desc->irq_data);
658 } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
659 chip->irq_eoi(&desc->irq_data);
664 * handle_fasteoi_irq - irq handler for transparent controllers
665 * @desc: the interrupt description structure for this irq
667 * Only a single callback will be issued to the chip: an ->eoi()
668 * call when the interrupt has been serviced. This enables support
669 * for modern forms of interrupt handlers, which handle the flow
670 * details in hardware, transparently.
672 void handle_fasteoi_irq(struct irq_desc *desc)
674 struct irq_chip *chip = desc->irq_data.chip;
676 raw_spin_lock(&desc->lock);
678 if (!irq_may_run(desc))
681 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
684 * If its disabled or no action available
685 * then mask it and get out of here:
687 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
688 desc->istate |= IRQS_PENDING;
693 kstat_incr_irqs_this_cpu(desc);
694 if (desc->istate & IRQS_ONESHOT)
697 preflow_handler(desc);
698 handle_irq_event(desc);
700 cond_unmask_eoi_irq(desc, chip);
702 raw_spin_unlock(&desc->lock);
705 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
706 chip->irq_eoi(&desc->irq_data);
707 raw_spin_unlock(&desc->lock);
709 EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
712 * handle_edge_irq - edge type IRQ handler
713 * @desc: the interrupt description structure for this irq
715 * Interrupt occures on the falling and/or rising edge of a hardware
716 * signal. The occurrence is latched into the irq controller hardware
717 * and must be acked in order to be reenabled. After the ack another
718 * interrupt can happen on the same source even before the first one
719 * is handled by the associated event handler. If this happens it
720 * might be necessary to disable (mask) the interrupt depending on the
721 * controller hardware. This requires to reenable the interrupt inside
722 * of the loop which handles the interrupts which have arrived while
723 * the handler was running. If all pending interrupts are handled, the
726 void handle_edge_irq(struct irq_desc *desc)
728 raw_spin_lock(&desc->lock);
730 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
732 if (!irq_may_run(desc)) {
733 desc->istate |= IRQS_PENDING;
739 * If its disabled or no action available then mask it and get
742 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
743 desc->istate |= IRQS_PENDING;
748 kstat_incr_irqs_this_cpu(desc);
750 /* Start handling the irq */
751 desc->irq_data.chip->irq_ack(&desc->irq_data);
754 if (unlikely(!desc->action)) {
760 * When another irq arrived while we were handling
761 * one, we could have masked the irq.
762 * Renable it, if it was not disabled in meantime.
764 if (unlikely(desc->istate & IRQS_PENDING)) {
765 if (!irqd_irq_disabled(&desc->irq_data) &&
766 irqd_irq_masked(&desc->irq_data))
770 handle_irq_event(desc);
772 } while ((desc->istate & IRQS_PENDING) &&
773 !irqd_irq_disabled(&desc->irq_data));
776 raw_spin_unlock(&desc->lock);
778 EXPORT_SYMBOL(handle_edge_irq);
780 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
782 * handle_edge_eoi_irq - edge eoi type IRQ handler
783 * @desc: the interrupt description structure for this irq
785 * Similar as the above handle_edge_irq, but using eoi and w/o the
788 void handle_edge_eoi_irq(struct irq_desc *desc)
790 struct irq_chip *chip = irq_desc_get_chip(desc);
792 raw_spin_lock(&desc->lock);
794 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
796 if (!irq_may_run(desc)) {
797 desc->istate |= IRQS_PENDING;
802 * If its disabled or no action available then mask it and get
805 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
806 desc->istate |= IRQS_PENDING;
810 kstat_incr_irqs_this_cpu(desc);
813 if (unlikely(!desc->action))
816 handle_irq_event(desc);
818 } while ((desc->istate & IRQS_PENDING) &&
819 !irqd_irq_disabled(&desc->irq_data));
822 chip->irq_eoi(&desc->irq_data);
823 raw_spin_unlock(&desc->lock);
828 * handle_percpu_irq - Per CPU local irq handler
829 * @desc: the interrupt description structure for this irq
831 * Per CPU interrupts on SMP machines without locking requirements
833 void handle_percpu_irq(struct irq_desc *desc)
835 struct irq_chip *chip = irq_desc_get_chip(desc);
837 kstat_incr_irqs_this_cpu(desc);
840 chip->irq_ack(&desc->irq_data);
842 handle_irq_event_percpu(desc);
845 chip->irq_eoi(&desc->irq_data);
849 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
850 * @desc: the interrupt description structure for this irq
852 * Per CPU interrupts on SMP machines without locking requirements. Same as
853 * handle_percpu_irq() above but with the following extras:
855 * action->percpu_dev_id is a pointer to percpu variables which
856 * contain the real device id for the cpu on which this handler is
859 void handle_percpu_devid_irq(struct irq_desc *desc)
861 struct irq_chip *chip = irq_desc_get_chip(desc);
862 struct irqaction *action = desc->action;
863 unsigned int irq = irq_desc_get_irq(desc);
866 kstat_incr_irqs_this_cpu(desc);
869 chip->irq_ack(&desc->irq_data);
871 if (likely(action)) {
872 trace_irq_handler_entry(irq, action);
873 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
874 trace_irq_handler_exit(irq, action, res);
876 unsigned int cpu = smp_processor_id();
877 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
880 irq_percpu_disable(desc, cpu);
882 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
883 enabled ? " and unmasked" : "", irq, cpu);
887 chip->irq_eoi(&desc->irq_data);
891 __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
892 int is_chained, const char *name)
895 handle = handle_bad_irq;
897 struct irq_data *irq_data = &desc->irq_data;
898 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
900 * With hierarchical domains we might run into a
901 * situation where the outermost chip is not yet set
902 * up, but the inner chips are there. Instead of
903 * bailing we install the handler, but obviously we
904 * cannot enable/startup the interrupt at this point.
907 if (irq_data->chip != &no_irq_chip)
910 * Bail out if the outer chip is not set up
911 * and the interrrupt supposed to be started
914 if (WARN_ON(is_chained))
917 irq_data = irq_data->parent_data;
920 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
925 if (handle == handle_bad_irq) {
926 if (desc->irq_data.chip != &no_irq_chip)
928 irq_state_set_disabled(desc);
933 desc->handle_irq = handle;
936 if (handle != handle_bad_irq && is_chained) {
937 unsigned int type = irqd_get_trigger_type(&desc->irq_data);
940 * We're about to start this interrupt immediately,
941 * hence the need to set the trigger configuration.
942 * But the .set_type callback may have overridden the
943 * flow handler, ignoring that we're dealing with a
944 * chained interrupt. Reset it immediately because we
947 if (type != IRQ_TYPE_NONE) {
948 __irq_set_trigger(desc, type);
949 desc->handle_irq = handle;
952 irq_settings_set_noprobe(desc);
953 irq_settings_set_norequest(desc);
954 irq_settings_set_nothread(desc);
955 desc->action = &chained_action;
956 irq_startup(desc, IRQ_RESEND, IRQ_START_FORCE);
961 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
965 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
970 __irq_do_set_handler(desc, handle, is_chained, name);
971 irq_put_desc_busunlock(desc, flags);
973 EXPORT_SYMBOL_GPL(__irq_set_handler);
976 irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
980 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
985 desc->irq_common_data.handler_data = data;
986 __irq_do_set_handler(desc, handle, 1, NULL);
988 irq_put_desc_busunlock(desc, flags);
990 EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
993 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
994 irq_flow_handler_t handle, const char *name)
996 irq_set_chip(irq, chip);
997 __irq_set_handler(irq, handle, 0, name);
999 EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1001 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1003 unsigned long flags;
1004 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1010 * Warn when a driver sets the no autoenable flag on an already
1013 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1015 irq_settings_clr_and_set(desc, clr, set);
1017 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1018 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1019 if (irq_settings_has_no_balance_set(desc))
1020 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1021 if (irq_settings_is_per_cpu(desc))
1022 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1023 if (irq_settings_can_move_pcntxt(desc))
1024 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1025 if (irq_settings_is_level(desc))
1026 irqd_set(&desc->irq_data, IRQD_LEVEL);
1028 irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
1030 irq_put_desc_unlock(desc, flags);
1032 EXPORT_SYMBOL_GPL(irq_modify_status);
1035 * irq_cpu_online - Invoke all irq_cpu_online functions.
1037 * Iterate through all irqs and invoke the chip.irq_cpu_online()
1040 void irq_cpu_online(void)
1042 struct irq_desc *desc;
1043 struct irq_chip *chip;
1044 unsigned long flags;
1047 for_each_active_irq(irq) {
1048 desc = irq_to_desc(irq);
1052 raw_spin_lock_irqsave(&desc->lock, flags);
1054 chip = irq_data_get_irq_chip(&desc->irq_data);
1055 if (chip && chip->irq_cpu_online &&
1056 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1057 !irqd_irq_disabled(&desc->irq_data)))
1058 chip->irq_cpu_online(&desc->irq_data);
1060 raw_spin_unlock_irqrestore(&desc->lock, flags);
1065 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1067 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1070 void irq_cpu_offline(void)
1072 struct irq_desc *desc;
1073 struct irq_chip *chip;
1074 unsigned long flags;
1077 for_each_active_irq(irq) {
1078 desc = irq_to_desc(irq);
1082 raw_spin_lock_irqsave(&desc->lock, flags);
1084 chip = irq_data_get_irq_chip(&desc->irq_data);
1085 if (chip && chip->irq_cpu_offline &&
1086 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1087 !irqd_irq_disabled(&desc->irq_data)))
1088 chip->irq_cpu_offline(&desc->irq_data);
1090 raw_spin_unlock_irqrestore(&desc->lock, flags);
1094 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1096 * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1098 * @data: Pointer to interrupt specific data
1100 void irq_chip_enable_parent(struct irq_data *data)
1102 data = data->parent_data;
1103 if (data->chip->irq_enable)
1104 data->chip->irq_enable(data);
1106 data->chip->irq_unmask(data);
1110 * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1112 * @data: Pointer to interrupt specific data
1114 void irq_chip_disable_parent(struct irq_data *data)
1116 data = data->parent_data;
1117 if (data->chip->irq_disable)
1118 data->chip->irq_disable(data);
1120 data->chip->irq_mask(data);
1124 * irq_chip_ack_parent - Acknowledge the parent interrupt
1125 * @data: Pointer to interrupt specific data
1127 void irq_chip_ack_parent(struct irq_data *data)
1129 data = data->parent_data;
1130 data->chip->irq_ack(data);
1132 EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1135 * irq_chip_mask_parent - Mask the parent interrupt
1136 * @data: Pointer to interrupt specific data
1138 void irq_chip_mask_parent(struct irq_data *data)
1140 data = data->parent_data;
1141 data->chip->irq_mask(data);
1143 EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1146 * irq_chip_unmask_parent - Unmask the parent interrupt
1147 * @data: Pointer to interrupt specific data
1149 void irq_chip_unmask_parent(struct irq_data *data)
1151 data = data->parent_data;
1152 data->chip->irq_unmask(data);
1154 EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1157 * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1158 * @data: Pointer to interrupt specific data
1160 void irq_chip_eoi_parent(struct irq_data *data)
1162 data = data->parent_data;
1163 data->chip->irq_eoi(data);
1165 EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1168 * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1169 * @data: Pointer to interrupt specific data
1170 * @dest: The affinity mask to set
1171 * @force: Flag to enforce setting (disable online checks)
1173 * Conditinal, as the underlying parent chip might not implement it.
1175 int irq_chip_set_affinity_parent(struct irq_data *data,
1176 const struct cpumask *dest, bool force)
1178 data = data->parent_data;
1179 if (data->chip->irq_set_affinity)
1180 return data->chip->irq_set_affinity(data, dest, force);
1186 * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1187 * @data: Pointer to interrupt specific data
1188 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1190 * Conditional, as the underlying parent chip might not implement it.
1192 int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1194 data = data->parent_data;
1196 if (data->chip->irq_set_type)
1197 return data->chip->irq_set_type(data, type);
1201 EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1204 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1205 * @data: Pointer to interrupt specific data
1207 * Iterate through the domain hierarchy of the interrupt and check
1208 * whether a hw retrigger function exists. If yes, invoke it.
1210 int irq_chip_retrigger_hierarchy(struct irq_data *data)
1212 for (data = data->parent_data; data; data = data->parent_data)
1213 if (data->chip && data->chip->irq_retrigger)
1214 return data->chip->irq_retrigger(data);
1220 * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1221 * @data: Pointer to interrupt specific data
1222 * @vcpu_info: The vcpu affinity information
1224 int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1226 data = data->parent_data;
1227 if (data->chip->irq_set_vcpu_affinity)
1228 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1234 * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1235 * @data: Pointer to interrupt specific data
1236 * @on: Whether to set or reset the wake-up capability of this irq
1238 * Conditional, as the underlying parent chip might not implement it.
1240 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1242 data = data->parent_data;
1243 if (data->chip->irq_set_wake)
1244 return data->chip->irq_set_wake(data, on);
1251 * irq_chip_compose_msi_msg - Componse msi message for a irq chip
1252 * @data: Pointer to interrupt specific data
1253 * @msg: Pointer to the MSI message
1255 * For hierarchical domains we find the first chip in the hierarchy
1256 * which implements the irq_compose_msi_msg callback. For non
1257 * hierarchical we use the top level chip.
1259 int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1261 struct irq_data *pos = NULL;
1263 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1264 for (; data; data = data->parent_data)
1266 if (data->chip && data->chip->irq_compose_msi_msg)
1271 pos->chip->irq_compose_msi_msg(pos, msg);
1277 * irq_chip_pm_get - Enable power for an IRQ chip
1278 * @data: Pointer to interrupt specific data
1280 * Enable the power to the IRQ chip referenced by the interrupt data
1283 int irq_chip_pm_get(struct irq_data *data)
1287 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
1288 retval = pm_runtime_get_sync(data->chip->parent_device);
1290 pm_runtime_put_noidle(data->chip->parent_device);
1299 * irq_chip_pm_put - Disable power for an IRQ chip
1300 * @data: Pointer to interrupt specific data
1302 * Disable the power to the IRQ chip referenced by the interrupt data
1303 * structure, belongs. Note that power will only be disabled, once this
1304 * function has been called for all IRQs that have called irq_chip_pm_get().
1306 int irq_chip_pm_put(struct irq_data *data)
1310 if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
1311 retval = pm_runtime_put(data->chip->parent_device);
1313 return (retval < 0) ? retval : 0;