1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 * Copyright (C) 2005-2006 Thomas Gleixner
6 * This file contains driver APIs to the irq subsystem.
9 #define pr_fmt(fmt) "genirq: " fmt
11 #include <linux/irq.h>
12 #include <linux/kthread.h>
13 #include <linux/module.h>
14 #include <linux/random.h>
15 #include <linux/interrupt.h>
16 #include <linux/slab.h>
17 #include <linux/sched.h>
18 #include <linux/sched/rt.h>
19 #include <linux/sched/task.h>
20 #include <uapi/linux/sched/types.h>
21 #include <linux/task_work.h>
23 #include "internals.h"
25 #ifdef CONFIG_IRQ_FORCED_THREADING
26 __read_mostly bool force_irqthreads;
27 EXPORT_SYMBOL_GPL(force_irqthreads);
29 static int __init setup_forced_irqthreads(char *arg)
31 force_irqthreads = true;
34 early_param("threadirqs", setup_forced_irqthreads);
37 static void __synchronize_hardirq(struct irq_desc *desc)
45 * Wait until we're out of the critical section. This might
46 * give the wrong answer due to the lack of memory barriers.
48 while (irqd_irq_inprogress(&desc->irq_data))
51 /* Ok, that indicated we're done: double-check carefully. */
52 raw_spin_lock_irqsave(&desc->lock, flags);
53 inprogress = irqd_irq_inprogress(&desc->irq_data);
54 raw_spin_unlock_irqrestore(&desc->lock, flags);
56 /* Oops, that failed? */
61 * synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs)
62 * @irq: interrupt number to wait for
64 * This function waits for any pending hard IRQ handlers for this
65 * interrupt to complete before returning. If you use this
66 * function while holding a resource the IRQ handler may need you
67 * will deadlock. It does not take associated threaded handlers
70 * Do not use this for shutdown scenarios where you must be sure
71 * that all parts (hardirq and threaded handler) have completed.
73 * Returns: false if a threaded handler is active.
75 * This function may be called - with care - from IRQ context.
77 bool synchronize_hardirq(unsigned int irq)
79 struct irq_desc *desc = irq_to_desc(irq);
82 __synchronize_hardirq(desc);
83 return !atomic_read(&desc->threads_active);
88 EXPORT_SYMBOL(synchronize_hardirq);
91 * synchronize_irq - wait for pending IRQ handlers (on other CPUs)
92 * @irq: interrupt number to wait for
94 * This function waits for any pending IRQ handlers for this interrupt
95 * to complete before returning. If you use this function while
96 * holding a resource the IRQ handler may need you will deadlock.
98 * This function may be called - with care - from IRQ context.
100 void synchronize_irq(unsigned int irq)
102 struct irq_desc *desc = irq_to_desc(irq);
105 __synchronize_hardirq(desc);
107 * We made sure that no hardirq handler is
108 * running. Now verify that no threaded handlers are
111 wait_event(desc->wait_for_threads,
112 !atomic_read(&desc->threads_active));
115 EXPORT_SYMBOL(synchronize_irq);
118 cpumask_var_t irq_default_affinity;
120 static bool __irq_can_set_affinity(struct irq_desc *desc)
122 if (!desc || !irqd_can_balance(&desc->irq_data) ||
123 !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity)
129 * irq_can_set_affinity - Check if the affinity of a given irq can be set
130 * @irq: Interrupt to check
133 int irq_can_set_affinity(unsigned int irq)
135 return __irq_can_set_affinity(irq_to_desc(irq));
139 * irq_can_set_affinity_usr - Check if affinity of a irq can be set from user space
140 * @irq: Interrupt to check
142 * Like irq_can_set_affinity() above, but additionally checks for the
143 * AFFINITY_MANAGED flag.
145 bool irq_can_set_affinity_usr(unsigned int irq)
147 struct irq_desc *desc = irq_to_desc(irq);
149 return __irq_can_set_affinity(desc) &&
150 !irqd_affinity_is_managed(&desc->irq_data);
154 * irq_set_thread_affinity - Notify irq threads to adjust affinity
155 * @desc: irq descriptor which has affitnity changed
157 * We just set IRQTF_AFFINITY and delegate the affinity setting
158 * to the interrupt thread itself. We can not call
159 * set_cpus_allowed_ptr() here as we hold desc->lock and this
160 * code can be called from hard interrupt context.
162 void irq_set_thread_affinity(struct irq_desc *desc)
164 struct irqaction *action;
166 for_each_action_of_desc(desc, action)
168 set_bit(IRQTF_AFFINITY, &action->thread_flags);
171 static void irq_validate_effective_affinity(struct irq_data *data)
173 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
174 const struct cpumask *m = irq_data_get_effective_affinity_mask(data);
175 struct irq_chip *chip = irq_data_get_irq_chip(data);
177 if (!cpumask_empty(m))
179 pr_warn_once("irq_chip %s did not update eff. affinity mask of irq %u\n",
180 chip->name, data->irq);
184 int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
187 struct irq_desc *desc = irq_data_to_desc(data);
188 struct irq_chip *chip = irq_data_get_irq_chip(data);
191 if (!chip || !chip->irq_set_affinity)
194 ret = chip->irq_set_affinity(data, mask, force);
196 case IRQ_SET_MASK_OK:
197 case IRQ_SET_MASK_OK_DONE:
198 cpumask_copy(desc->irq_common_data.affinity, mask);
200 case IRQ_SET_MASK_OK_NOCOPY:
201 irq_validate_effective_affinity(data);
202 irq_set_thread_affinity(desc);
209 #ifdef CONFIG_GENERIC_PENDING_IRQ
210 static inline int irq_set_affinity_pending(struct irq_data *data,
211 const struct cpumask *dest)
213 struct irq_desc *desc = irq_data_to_desc(data);
215 irqd_set_move_pending(data);
216 irq_copy_pending(desc, dest);
220 static inline int irq_set_affinity_pending(struct irq_data *data,
221 const struct cpumask *dest)
227 static int irq_try_set_affinity(struct irq_data *data,
228 const struct cpumask *dest, bool force)
230 int ret = irq_do_set_affinity(data, dest, force);
233 * In case that the underlying vector management is busy and the
234 * architecture supports the generic pending mechanism then utilize
235 * this to avoid returning an error to user space.
237 if (ret == -EBUSY && !force)
238 ret = irq_set_affinity_pending(data, dest);
242 int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
245 struct irq_chip *chip = irq_data_get_irq_chip(data);
246 struct irq_desc *desc = irq_data_to_desc(data);
249 if (!chip || !chip->irq_set_affinity)
252 if (irq_can_move_pcntxt(data) && !irqd_is_setaffinity_pending(data)) {
253 ret = irq_try_set_affinity(data, mask, force);
255 irqd_set_move_pending(data);
256 irq_copy_pending(desc, mask);
259 if (desc->affinity_notify) {
260 kref_get(&desc->affinity_notify->kref);
261 schedule_work(&desc->affinity_notify->work);
263 irqd_set(data, IRQD_AFFINITY_SET);
268 int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force)
270 struct irq_desc *desc = irq_to_desc(irq);
277 raw_spin_lock_irqsave(&desc->lock, flags);
278 ret = irq_set_affinity_locked(irq_desc_get_irq_data(desc), mask, force);
279 raw_spin_unlock_irqrestore(&desc->lock, flags);
283 int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m)
286 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
290 desc->affinity_hint = m;
291 irq_put_desc_unlock(desc, flags);
292 /* set the initial affinity to prevent every interrupt being on CPU0 */
294 __irq_set_affinity(irq, m, false);
297 EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
299 static void irq_affinity_notify(struct work_struct *work)
301 struct irq_affinity_notify *notify =
302 container_of(work, struct irq_affinity_notify, work);
303 struct irq_desc *desc = irq_to_desc(notify->irq);
304 cpumask_var_t cpumask;
307 if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL))
310 raw_spin_lock_irqsave(&desc->lock, flags);
311 if (irq_move_pending(&desc->irq_data))
312 irq_get_pending(cpumask, desc);
314 cpumask_copy(cpumask, desc->irq_common_data.affinity);
315 raw_spin_unlock_irqrestore(&desc->lock, flags);
317 notify->notify(notify, cpumask);
319 free_cpumask_var(cpumask);
321 kref_put(¬ify->kref, notify->release);
325 * irq_set_affinity_notifier - control notification of IRQ affinity changes
326 * @irq: Interrupt for which to enable/disable notification
327 * @notify: Context for notification, or %NULL to disable
328 * notification. Function pointers must be initialised;
329 * the other fields will be initialised by this function.
331 * Must be called in process context. Notification may only be enabled
332 * after the IRQ is allocated and must be disabled before the IRQ is
333 * freed using free_irq().
336 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
338 struct irq_desc *desc = irq_to_desc(irq);
339 struct irq_affinity_notify *old_notify;
342 /* The release function is promised process context */
345 if (!desc || desc->istate & IRQS_NMI)
348 /* Complete initialisation of *notify */
351 kref_init(¬ify->kref);
352 INIT_WORK(¬ify->work, irq_affinity_notify);
355 raw_spin_lock_irqsave(&desc->lock, flags);
356 old_notify = desc->affinity_notify;
357 desc->affinity_notify = notify;
358 raw_spin_unlock_irqrestore(&desc->lock, flags);
361 kref_put(&old_notify->kref, old_notify->release);
365 EXPORT_SYMBOL_GPL(irq_set_affinity_notifier);
367 #ifndef CONFIG_AUTO_IRQ_AFFINITY
369 * Generic version of the affinity autoselector.
371 int irq_setup_affinity(struct irq_desc *desc)
373 struct cpumask *set = irq_default_affinity;
374 int ret, node = irq_desc_get_node(desc);
375 static DEFINE_RAW_SPINLOCK(mask_lock);
376 static struct cpumask mask;
378 /* Excludes PER_CPU and NO_BALANCE interrupts */
379 if (!__irq_can_set_affinity(desc))
382 raw_spin_lock(&mask_lock);
384 * Preserve the managed affinity setting and a userspace affinity
385 * setup, but make sure that one of the targets is online.
387 if (irqd_affinity_is_managed(&desc->irq_data) ||
388 irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) {
389 if (cpumask_intersects(desc->irq_common_data.affinity,
391 set = desc->irq_common_data.affinity;
393 irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET);
396 cpumask_and(&mask, cpu_online_mask, set);
397 if (cpumask_empty(&mask))
398 cpumask_copy(&mask, cpu_online_mask);
400 if (node != NUMA_NO_NODE) {
401 const struct cpumask *nodemask = cpumask_of_node(node);
403 /* make sure at least one of the cpus in nodemask is online */
404 if (cpumask_intersects(&mask, nodemask))
405 cpumask_and(&mask, &mask, nodemask);
407 ret = irq_do_set_affinity(&desc->irq_data, &mask, false);
408 raw_spin_unlock(&mask_lock);
412 /* Wrapper for ALPHA specific affinity selector magic */
413 int irq_setup_affinity(struct irq_desc *desc)
415 return irq_select_affinity(irq_desc_get_irq(desc));
420 * Called when a bogus affinity is set via /proc/irq
422 int irq_select_affinity_usr(unsigned int irq)
424 struct irq_desc *desc = irq_to_desc(irq);
428 raw_spin_lock_irqsave(&desc->lock, flags);
429 ret = irq_setup_affinity(desc);
430 raw_spin_unlock_irqrestore(&desc->lock, flags);
436 * irq_set_vcpu_affinity - Set vcpu affinity for the interrupt
437 * @irq: interrupt number to set affinity
438 * @vcpu_info: vCPU specific data or pointer to a percpu array of vCPU
439 * specific data for percpu_devid interrupts
441 * This function uses the vCPU specific data to set the vCPU
442 * affinity for an irq. The vCPU specific data is passed from
443 * outside, such as KVM. One example code path is as below:
444 * KVM -> IOMMU -> irq_set_vcpu_affinity().
446 int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
449 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
450 struct irq_data *data;
451 struct irq_chip *chip;
457 data = irq_desc_get_irq_data(desc);
459 chip = irq_data_get_irq_chip(data);
460 if (chip && chip->irq_set_vcpu_affinity)
462 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
463 data = data->parent_data;
470 ret = chip->irq_set_vcpu_affinity(data, vcpu_info);
471 irq_put_desc_unlock(desc, flags);
475 EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity);
477 void __disable_irq(struct irq_desc *desc)
483 static int __disable_irq_nosync(unsigned int irq)
486 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
491 irq_put_desc_busunlock(desc, flags);
496 * disable_irq_nosync - disable an irq without waiting
497 * @irq: Interrupt to disable
499 * Disable the selected interrupt line. Disables and Enables are
501 * Unlike disable_irq(), this function does not ensure existing
502 * instances of the IRQ handler have completed before returning.
504 * This function may be called from IRQ context.
506 void disable_irq_nosync(unsigned int irq)
508 __disable_irq_nosync(irq);
510 EXPORT_SYMBOL(disable_irq_nosync);
513 * disable_irq - disable an irq and wait for completion
514 * @irq: Interrupt to disable
516 * Disable the selected interrupt line. Enables and Disables are
518 * This function waits for any pending IRQ handlers for this interrupt
519 * to complete before returning. If you use this function while
520 * holding a resource the IRQ handler may need you will deadlock.
522 * This function may be called - with care - from IRQ context.
524 void disable_irq(unsigned int irq)
526 if (!__disable_irq_nosync(irq))
527 synchronize_irq(irq);
529 EXPORT_SYMBOL(disable_irq);
532 * disable_hardirq - disables an irq and waits for hardirq completion
533 * @irq: Interrupt to disable
535 * Disable the selected interrupt line. Enables and Disables are
537 * This function waits for any pending hard IRQ handlers for this
538 * interrupt to complete before returning. If you use this function while
539 * holding a resource the hard IRQ handler may need you will deadlock.
541 * When used to optimistically disable an interrupt from atomic context
542 * the return value must be checked.
544 * Returns: false if a threaded handler is active.
546 * This function may be called - with care - from IRQ context.
548 bool disable_hardirq(unsigned int irq)
550 if (!__disable_irq_nosync(irq))
551 return synchronize_hardirq(irq);
555 EXPORT_SYMBOL_GPL(disable_hardirq);
558 * disable_nmi_nosync - disable an nmi without waiting
559 * @irq: Interrupt to disable
561 * Disable the selected interrupt line. Disables and enables are
563 * The interrupt to disable must have been requested through request_nmi.
564 * Unlike disable_nmi(), this function does not ensure existing
565 * instances of the IRQ handler have completed before returning.
567 void disable_nmi_nosync(unsigned int irq)
569 disable_irq_nosync(irq);
572 void __enable_irq(struct irq_desc *desc)
574 switch (desc->depth) {
577 WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n",
578 irq_desc_get_irq(desc));
581 if (desc->istate & IRQS_SUSPENDED)
583 /* Prevent probing on this irq: */
584 irq_settings_set_noprobe(desc);
586 * Call irq_startup() not irq_enable() here because the
587 * interrupt might be marked NOAUTOEN. So irq_startup()
588 * needs to be invoked when it gets enabled the first
589 * time. If it was already started up, then irq_startup()
590 * will invoke irq_enable() under the hood.
592 irq_startup(desc, IRQ_RESEND, IRQ_START_FORCE);
601 * enable_irq - enable handling of an irq
602 * @irq: Interrupt to enable
604 * Undoes the effect of one call to disable_irq(). If this
605 * matches the last disable, processing of interrupts on this
606 * IRQ line is re-enabled.
608 * This function may be called from IRQ context only when
609 * desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL !
611 void enable_irq(unsigned int irq)
614 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
618 if (WARN(!desc->irq_data.chip,
619 KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq))
624 irq_put_desc_busunlock(desc, flags);
626 EXPORT_SYMBOL(enable_irq);
629 * enable_nmi - enable handling of an nmi
630 * @irq: Interrupt to enable
632 * The interrupt to enable must have been requested through request_nmi.
633 * Undoes the effect of one call to disable_nmi(). If this
634 * matches the last disable, processing of interrupts on this
635 * IRQ line is re-enabled.
637 void enable_nmi(unsigned int irq)
642 static int set_irq_wake_real(unsigned int irq, unsigned int on)
644 struct irq_desc *desc = irq_to_desc(irq);
647 if (irq_desc_get_chip(desc)->flags & IRQCHIP_SKIP_SET_WAKE)
650 if (desc->irq_data.chip->irq_set_wake)
651 ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on);
657 * irq_set_irq_wake - control irq power management wakeup
658 * @irq: interrupt to control
659 * @on: enable/disable power management wakeup
661 * Enable/disable power management wakeup mode, which is
662 * disabled by default. Enables and disables must match,
663 * just as they match for non-wakeup mode support.
665 * Wakeup mode lets this IRQ wake the system from sleep
666 * states like "suspend to RAM".
668 int irq_set_irq_wake(unsigned int irq, unsigned int on)
671 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
677 /* Don't use NMIs as wake up interrupts please */
678 if (desc->istate & IRQS_NMI) {
683 /* wakeup-capable irqs can be shared between drivers that
684 * don't need to have the same sleep mode behaviors.
687 if (desc->wake_depth++ == 0) {
688 ret = set_irq_wake_real(irq, on);
690 desc->wake_depth = 0;
692 irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE);
695 if (desc->wake_depth == 0) {
696 WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
697 } else if (--desc->wake_depth == 0) {
698 ret = set_irq_wake_real(irq, on);
700 desc->wake_depth = 1;
702 irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE);
707 irq_put_desc_busunlock(desc, flags);
710 EXPORT_SYMBOL(irq_set_irq_wake);
713 * Internal function that tells the architecture code whether a
714 * particular irq has been exclusively allocated or is available
717 int can_request_irq(unsigned int irq, unsigned long irqflags)
720 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
726 if (irq_settings_can_request(desc)) {
728 irqflags & desc->action->flags & IRQF_SHARED)
731 irq_put_desc_unlock(desc, flags);
735 int __irq_set_trigger(struct irq_desc *desc, unsigned long flags)
737 struct irq_chip *chip = desc->irq_data.chip;
740 if (!chip || !chip->irq_set_type) {
742 * IRQF_TRIGGER_* but the PIC does not support multiple
745 pr_debug("No set_type function for IRQ %d (%s)\n",
746 irq_desc_get_irq(desc),
747 chip ? (chip->name ? : "unknown") : "unknown");
751 if (chip->flags & IRQCHIP_SET_TYPE_MASKED) {
752 if (!irqd_irq_masked(&desc->irq_data))
754 if (!irqd_irq_disabled(&desc->irq_data))
758 /* Mask all flags except trigger mode */
759 flags &= IRQ_TYPE_SENSE_MASK;
760 ret = chip->irq_set_type(&desc->irq_data, flags);
763 case IRQ_SET_MASK_OK:
764 case IRQ_SET_MASK_OK_DONE:
765 irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK);
766 irqd_set(&desc->irq_data, flags);
769 case IRQ_SET_MASK_OK_NOCOPY:
770 flags = irqd_get_trigger_type(&desc->irq_data);
771 irq_settings_set_trigger_mask(desc, flags);
772 irqd_clear(&desc->irq_data, IRQD_LEVEL);
773 irq_settings_clr_level(desc);
774 if (flags & IRQ_TYPE_LEVEL_MASK) {
775 irq_settings_set_level(desc);
776 irqd_set(&desc->irq_data, IRQD_LEVEL);
782 pr_err("Setting trigger mode %lu for irq %u failed (%pF)\n",
783 flags, irq_desc_get_irq(desc), chip->irq_set_type);
790 #ifdef CONFIG_HARDIRQS_SW_RESEND
791 int irq_set_parent(int irq, int parent_irq)
794 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
799 desc->parent_irq = parent_irq;
801 irq_put_desc_unlock(desc, flags);
804 EXPORT_SYMBOL_GPL(irq_set_parent);
808 * Default primary interrupt handler for threaded interrupts. Is
809 * assigned as primary handler when request_threaded_irq is called
810 * with handler == NULL. Useful for oneshot interrupts.
812 static irqreturn_t irq_default_primary_handler(int irq, void *dev_id)
814 return IRQ_WAKE_THREAD;
818 * Primary handler for nested threaded interrupts. Should never be
821 static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id)
823 WARN(1, "Primary handler called for nested irq %d\n", irq);
827 static irqreturn_t irq_forced_secondary_handler(int irq, void *dev_id)
829 WARN(1, "Secondary action handler called for irq %d\n", irq);
833 static int irq_wait_for_interrupt(struct irqaction *action)
836 set_current_state(TASK_INTERRUPTIBLE);
838 if (kthread_should_stop()) {
839 /* may need to run one last time */
840 if (test_and_clear_bit(IRQTF_RUNTHREAD,
841 &action->thread_flags)) {
842 __set_current_state(TASK_RUNNING);
845 __set_current_state(TASK_RUNNING);
849 if (test_and_clear_bit(IRQTF_RUNTHREAD,
850 &action->thread_flags)) {
851 __set_current_state(TASK_RUNNING);
859 * Oneshot interrupts keep the irq line masked until the threaded
860 * handler finished. unmask if the interrupt has not been disabled and
863 static void irq_finalize_oneshot(struct irq_desc *desc,
864 struct irqaction *action)
866 if (!(desc->istate & IRQS_ONESHOT) ||
867 action->handler == irq_forced_secondary_handler)
871 raw_spin_lock_irq(&desc->lock);
874 * Implausible though it may be we need to protect us against
875 * the following scenario:
877 * The thread is faster done than the hard interrupt handler
878 * on the other CPU. If we unmask the irq line then the
879 * interrupt can come in again and masks the line, leaves due
880 * to IRQS_INPROGRESS and the irq line is masked forever.
882 * This also serializes the state of shared oneshot handlers
883 * versus "desc->threads_onehsot |= action->thread_mask;" in
884 * irq_wake_thread(). See the comment there which explains the
887 if (unlikely(irqd_irq_inprogress(&desc->irq_data))) {
888 raw_spin_unlock_irq(&desc->lock);
889 chip_bus_sync_unlock(desc);
895 * Now check again, whether the thread should run. Otherwise
896 * we would clear the threads_oneshot bit of this thread which
899 if (test_bit(IRQTF_RUNTHREAD, &action->thread_flags))
902 desc->threads_oneshot &= ~action->thread_mask;
904 if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) &&
905 irqd_irq_masked(&desc->irq_data))
906 unmask_threaded_irq(desc);
909 raw_spin_unlock_irq(&desc->lock);
910 chip_bus_sync_unlock(desc);
915 * Check whether we need to change the affinity of the interrupt thread.
918 irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
923 if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags))
927 * In case we are out of memory we set IRQTF_AFFINITY again and
928 * try again next time
930 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) {
931 set_bit(IRQTF_AFFINITY, &action->thread_flags);
935 raw_spin_lock_irq(&desc->lock);
937 * This code is triggered unconditionally. Check the affinity
938 * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out.
940 if (cpumask_available(desc->irq_common_data.affinity)) {
941 const struct cpumask *m;
943 m = irq_data_get_effective_affinity_mask(&desc->irq_data);
944 cpumask_copy(mask, m);
948 raw_spin_unlock_irq(&desc->lock);
951 set_cpus_allowed_ptr(current, mask);
952 free_cpumask_var(mask);
956 irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
960 * Interrupts which are not explicitly requested as threaded
961 * interrupts rely on the implicit bh/preempt disable of the hard irq
962 * context. So we need to disable bh here to avoid deadlocks and other
966 irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action)
971 ret = action->thread_fn(action->irq, action->dev_id);
972 if (ret == IRQ_HANDLED)
973 atomic_inc(&desc->threads_handled);
975 irq_finalize_oneshot(desc, action);
981 * Interrupts explicitly requested as threaded interrupts want to be
982 * preemtible - many of them need to sleep and wait for slow busses to
985 static irqreturn_t irq_thread_fn(struct irq_desc *desc,
986 struct irqaction *action)
990 ret = action->thread_fn(action->irq, action->dev_id);
991 if (ret == IRQ_HANDLED)
992 atomic_inc(&desc->threads_handled);
994 irq_finalize_oneshot(desc, action);
998 static void wake_threads_waitq(struct irq_desc *desc)
1000 if (atomic_dec_and_test(&desc->threads_active))
1001 wake_up(&desc->wait_for_threads);
1004 static void irq_thread_dtor(struct callback_head *unused)
1006 struct task_struct *tsk = current;
1007 struct irq_desc *desc;
1008 struct irqaction *action;
1010 if (WARN_ON_ONCE(!(current->flags & PF_EXITING)))
1013 action = kthread_data(tsk);
1015 pr_err("exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n",
1016 tsk->comm, tsk->pid, action->irq);
1019 desc = irq_to_desc(action->irq);
1021 * If IRQTF_RUNTHREAD is set, we need to decrement
1022 * desc->threads_active and wake possible waiters.
1024 if (test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags))
1025 wake_threads_waitq(desc);
1027 /* Prevent a stale desc->threads_oneshot */
1028 irq_finalize_oneshot(desc, action);
1031 static void irq_wake_secondary(struct irq_desc *desc, struct irqaction *action)
1033 struct irqaction *secondary = action->secondary;
1035 if (WARN_ON_ONCE(!secondary))
1038 raw_spin_lock_irq(&desc->lock);
1039 __irq_wake_thread(desc, secondary);
1040 raw_spin_unlock_irq(&desc->lock);
1044 * Interrupt handler thread
1046 static int irq_thread(void *data)
1048 struct callback_head on_exit_work;
1049 struct irqaction *action = data;
1050 struct irq_desc *desc = irq_to_desc(action->irq);
1051 irqreturn_t (*handler_fn)(struct irq_desc *desc,
1052 struct irqaction *action);
1054 if (force_irqthreads && test_bit(IRQTF_FORCED_THREAD,
1055 &action->thread_flags))
1056 handler_fn = irq_forced_thread_fn;
1058 handler_fn = irq_thread_fn;
1060 init_task_work(&on_exit_work, irq_thread_dtor);
1061 task_work_add(current, &on_exit_work, false);
1063 irq_thread_check_affinity(desc, action);
1065 while (!irq_wait_for_interrupt(action)) {
1066 irqreturn_t action_ret;
1068 irq_thread_check_affinity(desc, action);
1070 action_ret = handler_fn(desc, action);
1071 if (action_ret == IRQ_WAKE_THREAD)
1072 irq_wake_secondary(desc, action);
1074 wake_threads_waitq(desc);
1078 * This is the regular exit path. __free_irq() is stopping the
1079 * thread via kthread_stop() after calling
1080 * synchronize_hardirq(). So neither IRQTF_RUNTHREAD nor the
1081 * oneshot mask bit can be set.
1083 task_work_cancel(current, irq_thread_dtor);
1088 * irq_wake_thread - wake the irq thread for the action identified by dev_id
1089 * @irq: Interrupt line
1090 * @dev_id: Device identity for which the thread should be woken
1093 void irq_wake_thread(unsigned int irq, void *dev_id)
1095 struct irq_desc *desc = irq_to_desc(irq);
1096 struct irqaction *action;
1097 unsigned long flags;
1099 if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1102 raw_spin_lock_irqsave(&desc->lock, flags);
1103 for_each_action_of_desc(desc, action) {
1104 if (action->dev_id == dev_id) {
1106 __irq_wake_thread(desc, action);
1110 raw_spin_unlock_irqrestore(&desc->lock, flags);
1112 EXPORT_SYMBOL_GPL(irq_wake_thread);
1114 static int irq_setup_forced_threading(struct irqaction *new)
1116 if (!force_irqthreads)
1118 if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT))
1122 * No further action required for interrupts which are requested as
1123 * threaded interrupts already
1125 if (new->handler == irq_default_primary_handler)
1128 new->flags |= IRQF_ONESHOT;
1131 * Handle the case where we have a real primary handler and a
1132 * thread handler. We force thread them as well by creating a
1135 if (new->handler && new->thread_fn) {
1136 /* Allocate the secondary action */
1137 new->secondary = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
1138 if (!new->secondary)
1140 new->secondary->handler = irq_forced_secondary_handler;
1141 new->secondary->thread_fn = new->thread_fn;
1142 new->secondary->dev_id = new->dev_id;
1143 new->secondary->irq = new->irq;
1144 new->secondary->name = new->name;
1146 /* Deal with the primary handler */
1147 set_bit(IRQTF_FORCED_THREAD, &new->thread_flags);
1148 new->thread_fn = new->handler;
1149 new->handler = irq_default_primary_handler;
1153 static int irq_request_resources(struct irq_desc *desc)
1155 struct irq_data *d = &desc->irq_data;
1156 struct irq_chip *c = d->chip;
1158 return c->irq_request_resources ? c->irq_request_resources(d) : 0;
1161 static void irq_release_resources(struct irq_desc *desc)
1163 struct irq_data *d = &desc->irq_data;
1164 struct irq_chip *c = d->chip;
1166 if (c->irq_release_resources)
1167 c->irq_release_resources(d);
1170 static bool irq_supports_nmi(struct irq_desc *desc)
1172 struct irq_data *d = irq_desc_get_irq_data(desc);
1174 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1175 /* Only IRQs directly managed by the root irqchip can be set as NMI */
1179 /* Don't support NMIs for chips behind a slow bus */
1180 if (d->chip->irq_bus_lock || d->chip->irq_bus_sync_unlock)
1183 return d->chip->flags & IRQCHIP_SUPPORTS_NMI;
1186 static int irq_nmi_setup(struct irq_desc *desc)
1188 struct irq_data *d = irq_desc_get_irq_data(desc);
1189 struct irq_chip *c = d->chip;
1191 return c->irq_nmi_setup ? c->irq_nmi_setup(d) : -EINVAL;
1194 static void irq_nmi_teardown(struct irq_desc *desc)
1196 struct irq_data *d = irq_desc_get_irq_data(desc);
1197 struct irq_chip *c = d->chip;
1199 if (c->irq_nmi_teardown)
1200 c->irq_nmi_teardown(d);
1204 setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary)
1206 struct task_struct *t;
1207 struct sched_param param = {
1208 .sched_priority = MAX_USER_RT_PRIO/2,
1212 t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
1215 t = kthread_create(irq_thread, new, "irq/%d-s-%s", irq,
1217 param.sched_priority -= 1;
1223 sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m);
1226 * We keep the reference to the task struct even if
1227 * the thread dies to avoid that the interrupt code
1228 * references an already freed task_struct.
1233 * Tell the thread to set its affinity. This is
1234 * important for shared interrupt handlers as we do
1235 * not invoke setup_affinity() for the secondary
1236 * handlers as everything is already set up. Even for
1237 * interrupts marked with IRQF_NO_BALANCE this is
1238 * correct as we want the thread to move to the cpu(s)
1239 * on which the requesting code placed the interrupt.
1241 set_bit(IRQTF_AFFINITY, &new->thread_flags);
1246 * Internal function to register an irqaction - typically used to
1247 * allocate special interrupts that are part of the architecture.
1251 * desc->request_mutex Provides serialization against a concurrent free_irq()
1252 * chip_bus_lock Provides serialization for slow bus operations
1253 * desc->lock Provides serialization against hard interrupts
1255 * chip_bus_lock and desc->lock are sufficient for all other management and
1256 * interrupt related functions. desc->request_mutex solely serializes
1257 * request/free_irq().
1260 __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
1262 struct irqaction *old, **old_ptr;
1263 unsigned long flags, thread_mask = 0;
1264 int ret, nested, shared = 0;
1269 if (desc->irq_data.chip == &no_irq_chip)
1271 if (!try_module_get(desc->owner))
1277 * If the trigger type is not specified by the caller,
1278 * then use the default for this interrupt.
1280 if (!(new->flags & IRQF_TRIGGER_MASK))
1281 new->flags |= irqd_get_trigger_type(&desc->irq_data);
1284 * Check whether the interrupt nests into another interrupt
1287 nested = irq_settings_is_nested_thread(desc);
1289 if (!new->thread_fn) {
1294 * Replace the primary handler which was provided from
1295 * the driver for non nested interrupt handling by the
1296 * dummy function which warns when called.
1298 new->handler = irq_nested_primary_handler;
1300 if (irq_settings_can_thread(desc)) {
1301 ret = irq_setup_forced_threading(new);
1308 * Create a handler thread when a thread function is supplied
1309 * and the interrupt does not nest into another interrupt
1312 if (new->thread_fn && !nested) {
1313 ret = setup_irq_thread(new, irq, false);
1316 if (new->secondary) {
1317 ret = setup_irq_thread(new->secondary, irq, true);
1324 * Drivers are often written to work w/o knowledge about the
1325 * underlying irq chip implementation, so a request for a
1326 * threaded irq without a primary hard irq context handler
1327 * requires the ONESHOT flag to be set. Some irq chips like
1328 * MSI based interrupts are per se one shot safe. Check the
1329 * chip flags, so we can avoid the unmask dance at the end of
1330 * the threaded handler for those.
1332 if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)
1333 new->flags &= ~IRQF_ONESHOT;
1336 * Protects against a concurrent __free_irq() call which might wait
1337 * for synchronize_hardirq() to complete without holding the optional
1338 * chip bus lock and desc->lock. Also protects against handing out
1339 * a recycled oneshot thread_mask bit while it's still in use by
1340 * its previous owner.
1342 mutex_lock(&desc->request_mutex);
1345 * Acquire bus lock as the irq_request_resources() callback below
1346 * might rely on the serialization or the magic power management
1347 * functions which are abusing the irq_bus_lock() callback,
1349 chip_bus_lock(desc);
1351 /* First installed action requests resources. */
1352 if (!desc->action) {
1353 ret = irq_request_resources(desc);
1355 pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n",
1356 new->name, irq, desc->irq_data.chip->name);
1357 goto out_bus_unlock;
1362 * The following block of code has to be executed atomically
1363 * protected against a concurrent interrupt and any of the other
1364 * management calls which are not serialized via
1365 * desc->request_mutex or the optional bus lock.
1367 raw_spin_lock_irqsave(&desc->lock, flags);
1368 old_ptr = &desc->action;
1372 * Can't share interrupts unless both agree to and are
1373 * the same type (level, edge, polarity). So both flag
1374 * fields must have IRQF_SHARED set and the bits which
1375 * set the trigger type must match. Also all must
1377 * Interrupt lines used for NMIs cannot be shared.
1379 unsigned int oldtype;
1381 if (desc->istate & IRQS_NMI) {
1382 pr_err("Invalid attempt to share NMI for %s (irq %d) on irqchip %s.\n",
1383 new->name, irq, desc->irq_data.chip->name);
1389 * If nobody did set the configuration before, inherit
1390 * the one provided by the requester.
1392 if (irqd_trigger_type_was_set(&desc->irq_data)) {
1393 oldtype = irqd_get_trigger_type(&desc->irq_data);
1395 oldtype = new->flags & IRQF_TRIGGER_MASK;
1396 irqd_set_trigger_type(&desc->irq_data, oldtype);
1399 if (!((old->flags & new->flags) & IRQF_SHARED) ||
1400 (oldtype != (new->flags & IRQF_TRIGGER_MASK)) ||
1401 ((old->flags ^ new->flags) & IRQF_ONESHOT))
1404 /* All handlers must agree on per-cpuness */
1405 if ((old->flags & IRQF_PERCPU) !=
1406 (new->flags & IRQF_PERCPU))
1409 /* add new interrupt at end of irq queue */
1412 * Or all existing action->thread_mask bits,
1413 * so we can find the next zero bit for this
1416 thread_mask |= old->thread_mask;
1417 old_ptr = &old->next;
1424 * Setup the thread mask for this irqaction for ONESHOT. For
1425 * !ONESHOT irqs the thread mask is 0 so we can avoid a
1426 * conditional in irq_wake_thread().
1428 if (new->flags & IRQF_ONESHOT) {
1430 * Unlikely to have 32 resp 64 irqs sharing one line,
1433 if (thread_mask == ~0UL) {
1438 * The thread_mask for the action is or'ed to
1439 * desc->thread_active to indicate that the
1440 * IRQF_ONESHOT thread handler has been woken, but not
1441 * yet finished. The bit is cleared when a thread
1442 * completes. When all threads of a shared interrupt
1443 * line have completed desc->threads_active becomes
1444 * zero and the interrupt line is unmasked. See
1445 * handle.c:irq_wake_thread() for further information.
1447 * If no thread is woken by primary (hard irq context)
1448 * interrupt handlers, then desc->threads_active is
1449 * also checked for zero to unmask the irq line in the
1450 * affected hard irq flow handlers
1451 * (handle_[fasteoi|level]_irq).
1453 * The new action gets the first zero bit of
1454 * thread_mask assigned. See the loop above which or's
1455 * all existing action->thread_mask bits.
1457 new->thread_mask = 1UL << ffz(thread_mask);
1459 } else if (new->handler == irq_default_primary_handler &&
1460 !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) {
1462 * The interrupt was requested with handler = NULL, so
1463 * we use the default primary handler for it. But it
1464 * does not have the oneshot flag set. In combination
1465 * with level interrupts this is deadly, because the
1466 * default primary handler just wakes the thread, then
1467 * the irq lines is reenabled, but the device still
1468 * has the level irq asserted. Rinse and repeat....
1470 * While this works for edge type interrupts, we play
1471 * it safe and reject unconditionally because we can't
1472 * say for sure which type this interrupt really
1473 * has. The type flags are unreliable as the
1474 * underlying chip implementation can override them.
1476 pr_err("Threaded irq requested with handler=NULL and !ONESHOT for irq %d\n",
1483 init_waitqueue_head(&desc->wait_for_threads);
1485 /* Setup the type (level, edge polarity) if configured: */
1486 if (new->flags & IRQF_TRIGGER_MASK) {
1487 ret = __irq_set_trigger(desc,
1488 new->flags & IRQF_TRIGGER_MASK);
1495 * Activate the interrupt. That activation must happen
1496 * independently of IRQ_NOAUTOEN. request_irq() can fail
1497 * and the callers are supposed to handle
1498 * that. enable_irq() of an interrupt requested with
1499 * IRQ_NOAUTOEN is not supposed to fail. The activation
1500 * keeps it in shutdown mode, it merily associates
1501 * resources if necessary and if that's not possible it
1502 * fails. Interrupts which are in managed shutdown mode
1503 * will simply ignore that activation request.
1505 ret = irq_activate(desc);
1509 desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \
1510 IRQS_ONESHOT | IRQS_WAITING);
1511 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
1513 if (new->flags & IRQF_PERCPU) {
1514 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1515 irq_settings_set_per_cpu(desc);
1518 if (new->flags & IRQF_ONESHOT)
1519 desc->istate |= IRQS_ONESHOT;
1521 /* Exclude IRQ from balancing if requested */
1522 if (new->flags & IRQF_NOBALANCING) {
1523 irq_settings_set_no_balancing(desc);
1524 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1527 if (irq_settings_can_autoenable(desc)) {
1528 irq_startup(desc, IRQ_RESEND, IRQ_START_COND);
1531 * Shared interrupts do not go well with disabling
1532 * auto enable. The sharing interrupt might request
1533 * it while it's still disabled and then wait for
1534 * interrupts forever.
1536 WARN_ON_ONCE(new->flags & IRQF_SHARED);
1537 /* Undo nested disables: */
1541 } else if (new->flags & IRQF_TRIGGER_MASK) {
1542 unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK;
1543 unsigned int omsk = irqd_get_trigger_type(&desc->irq_data);
1546 /* hope the handler works with current trigger mode */
1547 pr_warn("irq %d uses trigger mode %u; requested %u\n",
1553 irq_pm_install_action(desc, new);
1555 /* Reset broken irq detection when installing new handler */
1556 desc->irq_count = 0;
1557 desc->irqs_unhandled = 0;
1560 * Check whether we disabled the irq via the spurious handler
1561 * before. Reenable it and give it another chance.
1563 if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) {
1564 desc->istate &= ~IRQS_SPURIOUS_DISABLED;
1568 raw_spin_unlock_irqrestore(&desc->lock, flags);
1569 chip_bus_sync_unlock(desc);
1570 mutex_unlock(&desc->request_mutex);
1572 irq_setup_timings(desc, new);
1575 * Strictly no need to wake it up, but hung_task complains
1576 * when no hard interrupt wakes the thread up.
1579 wake_up_process(new->thread);
1581 wake_up_process(new->secondary->thread);
1583 register_irq_proc(irq, desc);
1585 register_handler_proc(irq, new);
1589 if (!(new->flags & IRQF_PROBE_SHARED)) {
1590 pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n",
1591 irq, new->flags, new->name, old->flags, old->name);
1592 #ifdef CONFIG_DEBUG_SHIRQ
1599 raw_spin_unlock_irqrestore(&desc->lock, flags);
1602 irq_release_resources(desc);
1604 chip_bus_sync_unlock(desc);
1605 mutex_unlock(&desc->request_mutex);
1609 struct task_struct *t = new->thread;
1615 if (new->secondary && new->secondary->thread) {
1616 struct task_struct *t = new->secondary->thread;
1618 new->secondary->thread = NULL;
1623 module_put(desc->owner);
1628 * setup_irq - setup an interrupt
1629 * @irq: Interrupt line to setup
1630 * @act: irqaction for the interrupt
1632 * Used to statically setup interrupts in the early boot process.
1634 int setup_irq(unsigned int irq, struct irqaction *act)
1637 struct irq_desc *desc = irq_to_desc(irq);
1639 if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1642 retval = irq_chip_pm_get(&desc->irq_data);
1646 retval = __setup_irq(irq, desc, act);
1649 irq_chip_pm_put(&desc->irq_data);
1653 EXPORT_SYMBOL_GPL(setup_irq);
1656 * Internal function to unregister an irqaction - used to free
1657 * regular and special interrupts that are part of the architecture.
1659 static struct irqaction *__free_irq(struct irq_desc *desc, void *dev_id)
1661 unsigned irq = desc->irq_data.irq;
1662 struct irqaction *action, **action_ptr;
1663 unsigned long flags;
1665 WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
1667 mutex_lock(&desc->request_mutex);
1668 chip_bus_lock(desc);
1669 raw_spin_lock_irqsave(&desc->lock, flags);
1672 * There can be multiple actions per IRQ descriptor, find the right
1673 * one based on the dev_id:
1675 action_ptr = &desc->action;
1677 action = *action_ptr;
1680 WARN(1, "Trying to free already-free IRQ %d\n", irq);
1681 raw_spin_unlock_irqrestore(&desc->lock, flags);
1682 chip_bus_sync_unlock(desc);
1683 mutex_unlock(&desc->request_mutex);
1687 if (action->dev_id == dev_id)
1689 action_ptr = &action->next;
1692 /* Found it - now remove it from the list of entries: */
1693 *action_ptr = action->next;
1695 irq_pm_remove_action(desc, action);
1697 /* If this was the last handler, shut down the IRQ line: */
1698 if (!desc->action) {
1699 irq_settings_clr_disable_unlazy(desc);
1704 /* make sure affinity_hint is cleaned up */
1705 if (WARN_ON_ONCE(desc->affinity_hint))
1706 desc->affinity_hint = NULL;
1709 raw_spin_unlock_irqrestore(&desc->lock, flags);
1711 * Drop bus_lock here so the changes which were done in the chip
1712 * callbacks above are synced out to the irq chips which hang
1713 * behind a slow bus (I2C, SPI) before calling synchronize_hardirq().
1715 * Aside of that the bus_lock can also be taken from the threaded
1716 * handler in irq_finalize_oneshot() which results in a deadlock
1717 * because kthread_stop() would wait forever for the thread to
1718 * complete, which is blocked on the bus lock.
1720 * The still held desc->request_mutex() protects against a
1721 * concurrent request_irq() of this irq so the release of resources
1722 * and timing data is properly serialized.
1724 chip_bus_sync_unlock(desc);
1726 unregister_handler_proc(irq, action);
1728 /* Make sure it's not being used on another CPU: */
1729 synchronize_hardirq(irq);
1731 #ifdef CONFIG_DEBUG_SHIRQ
1733 * It's a shared IRQ -- the driver ought to be prepared for an IRQ
1734 * event to happen even now it's being freed, so let's make sure that
1735 * is so by doing an extra call to the handler ....
1737 * ( We do this after actually deregistering it, to make sure that a
1738 * 'real' IRQ doesn't run in parallel with our fake. )
1740 if (action->flags & IRQF_SHARED) {
1741 local_irq_save(flags);
1742 action->handler(irq, dev_id);
1743 local_irq_restore(flags);
1748 * The action has already been removed above, but the thread writes
1749 * its oneshot mask bit when it completes. Though request_mutex is
1750 * held across this which prevents __setup_irq() from handing out
1751 * the same bit to a newly requested action.
1753 if (action->thread) {
1754 kthread_stop(action->thread);
1755 put_task_struct(action->thread);
1756 if (action->secondary && action->secondary->thread) {
1757 kthread_stop(action->secondary->thread);
1758 put_task_struct(action->secondary->thread);
1762 /* Last action releases resources */
1763 if (!desc->action) {
1765 * Reaquire bus lock as irq_release_resources() might
1766 * require it to deallocate resources over the slow bus.
1768 chip_bus_lock(desc);
1769 irq_release_resources(desc);
1770 chip_bus_sync_unlock(desc);
1771 irq_remove_timings(desc);
1774 mutex_unlock(&desc->request_mutex);
1776 irq_chip_pm_put(&desc->irq_data);
1777 module_put(desc->owner);
1778 kfree(action->secondary);
1783 * remove_irq - free an interrupt
1784 * @irq: Interrupt line to free
1785 * @act: irqaction for the interrupt
1787 * Used to remove interrupts statically setup by the early boot process.
1789 void remove_irq(unsigned int irq, struct irqaction *act)
1791 struct irq_desc *desc = irq_to_desc(irq);
1793 if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1794 __free_irq(desc, act->dev_id);
1796 EXPORT_SYMBOL_GPL(remove_irq);
1799 * free_irq - free an interrupt allocated with request_irq
1800 * @irq: Interrupt line to free
1801 * @dev_id: Device identity to free
1803 * Remove an interrupt handler. The handler is removed and if the
1804 * interrupt line is no longer in use by any driver it is disabled.
1805 * On a shared IRQ the caller must ensure the interrupt is disabled
1806 * on the card it drives before calling this function. The function
1807 * does not return until any executing interrupts for this IRQ
1810 * This function must not be called from interrupt context.
1812 * Returns the devname argument passed to request_irq.
1814 const void *free_irq(unsigned int irq, void *dev_id)
1816 struct irq_desc *desc = irq_to_desc(irq);
1817 struct irqaction *action;
1818 const char *devname;
1820 if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1824 if (WARN_ON(desc->affinity_notify))
1825 desc->affinity_notify = NULL;
1828 action = __free_irq(desc, dev_id);
1833 devname = action->name;
1837 EXPORT_SYMBOL(free_irq);
1839 /* This function must be called with desc->lock held */
1840 static const void *__cleanup_nmi(unsigned int irq, struct irq_desc *desc)
1842 const char *devname = NULL;
1844 desc->istate &= ~IRQS_NMI;
1846 if (!WARN_ON(desc->action == NULL)) {
1847 irq_pm_remove_action(desc, desc->action);
1848 devname = desc->action->name;
1849 unregister_handler_proc(irq, desc->action);
1851 kfree(desc->action);
1852 desc->action = NULL;
1855 irq_settings_clr_disable_unlazy(desc);
1858 irq_release_resources(desc);
1860 irq_chip_pm_put(&desc->irq_data);
1861 module_put(desc->owner);
1866 const void *free_nmi(unsigned int irq, void *dev_id)
1868 struct irq_desc *desc = irq_to_desc(irq);
1869 unsigned long flags;
1870 const void *devname;
1872 if (!desc || WARN_ON(!(desc->istate & IRQS_NMI)))
1875 if (WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1878 /* NMI still enabled */
1879 if (WARN_ON(desc->depth == 0))
1880 disable_nmi_nosync(irq);
1882 raw_spin_lock_irqsave(&desc->lock, flags);
1884 irq_nmi_teardown(desc);
1885 devname = __cleanup_nmi(irq, desc);
1887 raw_spin_unlock_irqrestore(&desc->lock, flags);
1893 * request_threaded_irq - allocate an interrupt line
1894 * @irq: Interrupt line to allocate
1895 * @handler: Function to be called when the IRQ occurs.
1896 * Primary handler for threaded interrupts
1897 * If NULL and thread_fn != NULL the default
1898 * primary handler is installed
1899 * @thread_fn: Function called from the irq handler thread
1900 * If NULL, no irq thread is created
1901 * @irqflags: Interrupt type flags
1902 * @devname: An ascii name for the claiming device
1903 * @dev_id: A cookie passed back to the handler function
1905 * This call allocates interrupt resources and enables the
1906 * interrupt line and IRQ handling. From the point this
1907 * call is made your handler function may be invoked. Since
1908 * your handler function must clear any interrupt the board
1909 * raises, you must take care both to initialise your hardware
1910 * and to set up the interrupt handler in the right order.
1912 * If you want to set up a threaded irq handler for your device
1913 * then you need to supply @handler and @thread_fn. @handler is
1914 * still called in hard interrupt context and has to check
1915 * whether the interrupt originates from the device. If yes it
1916 * needs to disable the interrupt on the device and return
1917 * IRQ_WAKE_THREAD which will wake up the handler thread and run
1918 * @thread_fn. This split handler design is necessary to support
1919 * shared interrupts.
1921 * Dev_id must be globally unique. Normally the address of the
1922 * device data structure is used as the cookie. Since the handler
1923 * receives this value it makes sense to use it.
1925 * If your interrupt is shared you must pass a non NULL dev_id
1926 * as this is required when freeing the interrupt.
1930 * IRQF_SHARED Interrupt is shared
1931 * IRQF_TRIGGER_* Specify active edge(s) or level
1934 int request_threaded_irq(unsigned int irq, irq_handler_t handler,
1935 irq_handler_t thread_fn, unsigned long irqflags,
1936 const char *devname, void *dev_id)
1938 struct irqaction *action;
1939 struct irq_desc *desc;
1942 if (irq == IRQ_NOTCONNECTED)
1946 * Sanity-check: shared interrupts must pass in a real dev-ID,
1947 * otherwise we'll have trouble later trying to figure out
1948 * which interrupt is which (messes up the interrupt freeing
1951 * Also IRQF_COND_SUSPEND only makes sense for shared interrupts and
1952 * it cannot be set along with IRQF_NO_SUSPEND.
1954 if (((irqflags & IRQF_SHARED) && !dev_id) ||
1955 (!(irqflags & IRQF_SHARED) && (irqflags & IRQF_COND_SUSPEND)) ||
1956 ((irqflags & IRQF_NO_SUSPEND) && (irqflags & IRQF_COND_SUSPEND)))
1959 desc = irq_to_desc(irq);
1963 if (!irq_settings_can_request(desc) ||
1964 WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1970 handler = irq_default_primary_handler;
1973 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
1977 action->handler = handler;
1978 action->thread_fn = thread_fn;
1979 action->flags = irqflags;
1980 action->name = devname;
1981 action->dev_id = dev_id;
1983 retval = irq_chip_pm_get(&desc->irq_data);
1989 retval = __setup_irq(irq, desc, action);
1992 irq_chip_pm_put(&desc->irq_data);
1993 kfree(action->secondary);
1997 #ifdef CONFIG_DEBUG_SHIRQ_FIXME
1998 if (!retval && (irqflags & IRQF_SHARED)) {
2000 * It's a shared IRQ -- the driver ought to be prepared for it
2001 * to happen immediately, so let's make sure....
2002 * We disable the irq to make sure that a 'real' IRQ doesn't
2003 * run in parallel with our fake.
2005 unsigned long flags;
2008 local_irq_save(flags);
2010 handler(irq, dev_id);
2012 local_irq_restore(flags);
2018 EXPORT_SYMBOL(request_threaded_irq);
2021 * request_any_context_irq - allocate an interrupt line
2022 * @irq: Interrupt line to allocate
2023 * @handler: Function to be called when the IRQ occurs.
2024 * Threaded handler for threaded interrupts.
2025 * @flags: Interrupt type flags
2026 * @name: An ascii name for the claiming device
2027 * @dev_id: A cookie passed back to the handler function
2029 * This call allocates interrupt resources and enables the
2030 * interrupt line and IRQ handling. It selects either a
2031 * hardirq or threaded handling method depending on the
2034 * On failure, it returns a negative value. On success,
2035 * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED.
2037 int request_any_context_irq(unsigned int irq, irq_handler_t handler,
2038 unsigned long flags, const char *name, void *dev_id)
2040 struct irq_desc *desc;
2043 if (irq == IRQ_NOTCONNECTED)
2046 desc = irq_to_desc(irq);
2050 if (irq_settings_is_nested_thread(desc)) {
2051 ret = request_threaded_irq(irq, NULL, handler,
2052 flags, name, dev_id);
2053 return !ret ? IRQC_IS_NESTED : ret;
2056 ret = request_irq(irq, handler, flags, name, dev_id);
2057 return !ret ? IRQC_IS_HARDIRQ : ret;
2059 EXPORT_SYMBOL_GPL(request_any_context_irq);
2062 * request_nmi - allocate an interrupt line for NMI delivery
2063 * @irq: Interrupt line to allocate
2064 * @handler: Function to be called when the IRQ occurs.
2065 * Threaded handler for threaded interrupts.
2066 * @irqflags: Interrupt type flags
2067 * @name: An ascii name for the claiming device
2068 * @dev_id: A cookie passed back to the handler function
2070 * This call allocates interrupt resources and enables the
2071 * interrupt line and IRQ handling. It sets up the IRQ line
2072 * to be handled as an NMI.
2074 * An interrupt line delivering NMIs cannot be shared and IRQ handling
2075 * cannot be threaded.
2077 * Interrupt lines requested for NMI delivering must produce per cpu
2078 * interrupts and have auto enabling setting disabled.
2080 * Dev_id must be globally unique. Normally the address of the
2081 * device data structure is used as the cookie. Since the handler
2082 * receives this value it makes sense to use it.
2084 * If the interrupt line cannot be used to deliver NMIs, function
2085 * will fail and return a negative value.
2087 int request_nmi(unsigned int irq, irq_handler_t handler,
2088 unsigned long irqflags, const char *name, void *dev_id)
2090 struct irqaction *action;
2091 struct irq_desc *desc;
2092 unsigned long flags;
2095 if (irq == IRQ_NOTCONNECTED)
2098 /* NMI cannot be shared, used for Polling */
2099 if (irqflags & (IRQF_SHARED | IRQF_COND_SUSPEND | IRQF_IRQPOLL))
2102 if (!(irqflags & IRQF_PERCPU))
2108 desc = irq_to_desc(irq);
2110 if (!desc || irq_settings_can_autoenable(desc) ||
2111 !irq_settings_can_request(desc) ||
2112 WARN_ON(irq_settings_is_per_cpu_devid(desc)) ||
2113 !irq_supports_nmi(desc))
2116 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2120 action->handler = handler;
2121 action->flags = irqflags | IRQF_NO_THREAD | IRQF_NOBALANCING;
2122 action->name = name;
2123 action->dev_id = dev_id;
2125 retval = irq_chip_pm_get(&desc->irq_data);
2129 retval = __setup_irq(irq, desc, action);
2133 raw_spin_lock_irqsave(&desc->lock, flags);
2135 /* Setup NMI state */
2136 desc->istate |= IRQS_NMI;
2137 retval = irq_nmi_setup(desc);
2139 __cleanup_nmi(irq, desc);
2140 raw_spin_unlock_irqrestore(&desc->lock, flags);
2144 raw_spin_unlock_irqrestore(&desc->lock, flags);
2149 irq_chip_pm_put(&desc->irq_data);
2156 void enable_percpu_irq(unsigned int irq, unsigned int type)
2158 unsigned int cpu = smp_processor_id();
2159 unsigned long flags;
2160 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
2166 * If the trigger type is not specified by the caller, then
2167 * use the default for this interrupt.
2169 type &= IRQ_TYPE_SENSE_MASK;
2170 if (type == IRQ_TYPE_NONE)
2171 type = irqd_get_trigger_type(&desc->irq_data);
2173 if (type != IRQ_TYPE_NONE) {
2176 ret = __irq_set_trigger(desc, type);
2179 WARN(1, "failed to set type for IRQ%d\n", irq);
2184 irq_percpu_enable(desc, cpu);
2186 irq_put_desc_unlock(desc, flags);
2188 EXPORT_SYMBOL_GPL(enable_percpu_irq);
2190 void enable_percpu_nmi(unsigned int irq, unsigned int type)
2192 enable_percpu_irq(irq, type);
2196 * irq_percpu_is_enabled - Check whether the per cpu irq is enabled
2197 * @irq: Linux irq number to check for
2199 * Must be called from a non migratable context. Returns the enable
2200 * state of a per cpu interrupt on the current cpu.
2202 bool irq_percpu_is_enabled(unsigned int irq)
2204 unsigned int cpu = smp_processor_id();
2205 struct irq_desc *desc;
2206 unsigned long flags;
2209 desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
2213 is_enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
2214 irq_put_desc_unlock(desc, flags);
2218 EXPORT_SYMBOL_GPL(irq_percpu_is_enabled);
2220 void disable_percpu_irq(unsigned int irq)
2222 unsigned int cpu = smp_processor_id();
2223 unsigned long flags;
2224 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
2229 irq_percpu_disable(desc, cpu);
2230 irq_put_desc_unlock(desc, flags);
2232 EXPORT_SYMBOL_GPL(disable_percpu_irq);
2234 void disable_percpu_nmi(unsigned int irq)
2236 disable_percpu_irq(irq);
2240 * Internal function to unregister a percpu irqaction.
2242 static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id)
2244 struct irq_desc *desc = irq_to_desc(irq);
2245 struct irqaction *action;
2246 unsigned long flags;
2248 WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
2253 raw_spin_lock_irqsave(&desc->lock, flags);
2255 action = desc->action;
2256 if (!action || action->percpu_dev_id != dev_id) {
2257 WARN(1, "Trying to free already-free IRQ %d\n", irq);
2261 if (!cpumask_empty(desc->percpu_enabled)) {
2262 WARN(1, "percpu IRQ %d still enabled on CPU%d!\n",
2263 irq, cpumask_first(desc->percpu_enabled));
2267 /* Found it - now remove it from the list of entries: */
2268 desc->action = NULL;
2270 desc->istate &= ~IRQS_NMI;
2272 raw_spin_unlock_irqrestore(&desc->lock, flags);
2274 unregister_handler_proc(irq, action);
2276 irq_chip_pm_put(&desc->irq_data);
2277 module_put(desc->owner);
2281 raw_spin_unlock_irqrestore(&desc->lock, flags);
2286 * remove_percpu_irq - free a per-cpu interrupt
2287 * @irq: Interrupt line to free
2288 * @act: irqaction for the interrupt
2290 * Used to remove interrupts statically setup by the early boot process.
2292 void remove_percpu_irq(unsigned int irq, struct irqaction *act)
2294 struct irq_desc *desc = irq_to_desc(irq);
2296 if (desc && irq_settings_is_per_cpu_devid(desc))
2297 __free_percpu_irq(irq, act->percpu_dev_id);
2301 * free_percpu_irq - free an interrupt allocated with request_percpu_irq
2302 * @irq: Interrupt line to free
2303 * @dev_id: Device identity to free
2305 * Remove a percpu interrupt handler. The handler is removed, but
2306 * the interrupt line is not disabled. This must be done on each
2307 * CPU before calling this function. The function does not return
2308 * until any executing interrupts for this IRQ have completed.
2310 * This function must not be called from interrupt context.
2312 void free_percpu_irq(unsigned int irq, void __percpu *dev_id)
2314 struct irq_desc *desc = irq_to_desc(irq);
2316 if (!desc || !irq_settings_is_per_cpu_devid(desc))
2319 chip_bus_lock(desc);
2320 kfree(__free_percpu_irq(irq, dev_id));
2321 chip_bus_sync_unlock(desc);
2323 EXPORT_SYMBOL_GPL(free_percpu_irq);
2325 void free_percpu_nmi(unsigned int irq, void __percpu *dev_id)
2327 struct irq_desc *desc = irq_to_desc(irq);
2329 if (!desc || !irq_settings_is_per_cpu_devid(desc))
2332 if (WARN_ON(!(desc->istate & IRQS_NMI)))
2335 kfree(__free_percpu_irq(irq, dev_id));
2339 * setup_percpu_irq - setup a per-cpu interrupt
2340 * @irq: Interrupt line to setup
2341 * @act: irqaction for the interrupt
2343 * Used to statically setup per-cpu interrupts in the early boot process.
2345 int setup_percpu_irq(unsigned int irq, struct irqaction *act)
2347 struct irq_desc *desc = irq_to_desc(irq);
2350 if (!desc || !irq_settings_is_per_cpu_devid(desc))
2353 retval = irq_chip_pm_get(&desc->irq_data);
2357 retval = __setup_irq(irq, desc, act);
2360 irq_chip_pm_put(&desc->irq_data);
2366 * __request_percpu_irq - allocate a percpu interrupt line
2367 * @irq: Interrupt line to allocate
2368 * @handler: Function to be called when the IRQ occurs.
2369 * @flags: Interrupt type flags (IRQF_TIMER only)
2370 * @devname: An ascii name for the claiming device
2371 * @dev_id: A percpu cookie passed back to the handler function
2373 * This call allocates interrupt resources and enables the
2374 * interrupt on the local CPU. If the interrupt is supposed to be
2375 * enabled on other CPUs, it has to be done on each CPU using
2376 * enable_percpu_irq().
2378 * Dev_id must be globally unique. It is a per-cpu variable, and
2379 * the handler gets called with the interrupted CPU's instance of
2382 int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
2383 unsigned long flags, const char *devname,
2384 void __percpu *dev_id)
2386 struct irqaction *action;
2387 struct irq_desc *desc;
2393 desc = irq_to_desc(irq);
2394 if (!desc || !irq_settings_can_request(desc) ||
2395 !irq_settings_is_per_cpu_devid(desc))
2398 if (flags && flags != IRQF_TIMER)
2401 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2405 action->handler = handler;
2406 action->flags = flags | IRQF_PERCPU | IRQF_NO_SUSPEND;
2407 action->name = devname;
2408 action->percpu_dev_id = dev_id;
2410 retval = irq_chip_pm_get(&desc->irq_data);
2416 retval = __setup_irq(irq, desc, action);
2419 irq_chip_pm_put(&desc->irq_data);
2425 EXPORT_SYMBOL_GPL(__request_percpu_irq);
2428 * request_percpu_nmi - allocate a percpu interrupt line for NMI delivery
2429 * @irq: Interrupt line to allocate
2430 * @handler: Function to be called when the IRQ occurs.
2431 * @name: An ascii name for the claiming device
2432 * @dev_id: A percpu cookie passed back to the handler function
2434 * This call allocates interrupt resources for a per CPU NMI. Per CPU NMIs
2435 * have to be setup on each CPU by calling prepare_percpu_nmi() before
2436 * being enabled on the same CPU by using enable_percpu_nmi().
2438 * Dev_id must be globally unique. It is a per-cpu variable, and
2439 * the handler gets called with the interrupted CPU's instance of
2442 * Interrupt lines requested for NMI delivering should have auto enabling
2445 * If the interrupt line cannot be used to deliver NMIs, function
2446 * will fail returning a negative value.
2448 int request_percpu_nmi(unsigned int irq, irq_handler_t handler,
2449 const char *name, void __percpu *dev_id)
2451 struct irqaction *action;
2452 struct irq_desc *desc;
2453 unsigned long flags;
2459 desc = irq_to_desc(irq);
2461 if (!desc || !irq_settings_can_request(desc) ||
2462 !irq_settings_is_per_cpu_devid(desc) ||
2463 irq_settings_can_autoenable(desc) ||
2464 !irq_supports_nmi(desc))
2467 /* The line cannot already be NMI */
2468 if (desc->istate & IRQS_NMI)
2471 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2475 action->handler = handler;
2476 action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND | IRQF_NO_THREAD
2478 action->name = name;
2479 action->percpu_dev_id = dev_id;
2481 retval = irq_chip_pm_get(&desc->irq_data);
2485 retval = __setup_irq(irq, desc, action);
2489 raw_spin_lock_irqsave(&desc->lock, flags);
2490 desc->istate |= IRQS_NMI;
2491 raw_spin_unlock_irqrestore(&desc->lock, flags);
2496 irq_chip_pm_put(&desc->irq_data);
2504 * prepare_percpu_nmi - performs CPU local setup for NMI delivery
2505 * @irq: Interrupt line to prepare for NMI delivery
2507 * This call prepares an interrupt line to deliver NMI on the current CPU,
2508 * before that interrupt line gets enabled with enable_percpu_nmi().
2510 * As a CPU local operation, this should be called from non-preemptible
2513 * If the interrupt line cannot be used to deliver NMIs, function
2514 * will fail returning a negative value.
2516 int prepare_percpu_nmi(unsigned int irq)
2518 unsigned long flags;
2519 struct irq_desc *desc;
2522 WARN_ON(preemptible());
2524 desc = irq_get_desc_lock(irq, &flags,
2525 IRQ_GET_DESC_CHECK_PERCPU);
2529 if (WARN(!(desc->istate & IRQS_NMI),
2530 KERN_ERR "prepare_percpu_nmi called for a non-NMI interrupt: irq %u\n",
2536 ret = irq_nmi_setup(desc);
2538 pr_err("Failed to setup NMI delivery: irq %u\n", irq);
2543 irq_put_desc_unlock(desc, flags);
2548 * teardown_percpu_nmi - undoes NMI setup of IRQ line
2549 * @irq: Interrupt line from which CPU local NMI configuration should be
2552 * This call undoes the setup done by prepare_percpu_nmi().
2554 * IRQ line should not be enabled for the current CPU.
2556 * As a CPU local operation, this should be called from non-preemptible
2559 void teardown_percpu_nmi(unsigned int irq)
2561 unsigned long flags;
2562 struct irq_desc *desc;
2564 WARN_ON(preemptible());
2566 desc = irq_get_desc_lock(irq, &flags,
2567 IRQ_GET_DESC_CHECK_PERCPU);
2571 if (WARN_ON(!(desc->istate & IRQS_NMI)))
2574 irq_nmi_teardown(desc);
2576 irq_put_desc_unlock(desc, flags);
2580 * irq_get_irqchip_state - returns the irqchip state of a interrupt.
2581 * @irq: Interrupt line that is forwarded to a VM
2582 * @which: One of IRQCHIP_STATE_* the caller wants to know about
2583 * @state: a pointer to a boolean where the state is to be storeed
2585 * This call snapshots the internal irqchip state of an
2586 * interrupt, returning into @state the bit corresponding to
2589 * This function should be called with preemption disabled if the
2590 * interrupt controller has per-cpu registers.
2592 int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
2595 struct irq_desc *desc;
2596 struct irq_data *data;
2597 struct irq_chip *chip;
2598 unsigned long flags;
2601 desc = irq_get_desc_buslock(irq, &flags, 0);
2605 data = irq_desc_get_irq_data(desc);
2608 chip = irq_data_get_irq_chip(data);
2609 if (chip->irq_get_irqchip_state)
2611 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2612 data = data->parent_data;
2619 err = chip->irq_get_irqchip_state(data, which, state);
2621 irq_put_desc_busunlock(desc, flags);
2624 EXPORT_SYMBOL_GPL(irq_get_irqchip_state);
2627 * irq_set_irqchip_state - set the state of a forwarded interrupt.
2628 * @irq: Interrupt line that is forwarded to a VM
2629 * @which: State to be restored (one of IRQCHIP_STATE_*)
2630 * @val: Value corresponding to @which
2632 * This call sets the internal irqchip state of an interrupt,
2633 * depending on the value of @which.
2635 * This function should be called with preemption disabled if the
2636 * interrupt controller has per-cpu registers.
2638 int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
2641 struct irq_desc *desc;
2642 struct irq_data *data;
2643 struct irq_chip *chip;
2644 unsigned long flags;
2647 desc = irq_get_desc_buslock(irq, &flags, 0);
2651 data = irq_desc_get_irq_data(desc);
2654 chip = irq_data_get_irq_chip(data);
2655 if (chip->irq_set_irqchip_state)
2657 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2658 data = data->parent_data;
2665 err = chip->irq_set_irqchip_state(data, which, val);
2667 irq_put_desc_busunlock(desc, flags);
2670 EXPORT_SYMBOL_GPL(irq_set_irqchip_state);