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);
199 case IRQ_SET_MASK_OK_NOCOPY:
200 irq_validate_effective_affinity(data);
201 irq_set_thread_affinity(desc);
208 #ifdef CONFIG_GENERIC_PENDING_IRQ
209 static inline int irq_set_affinity_pending(struct irq_data *data,
210 const struct cpumask *dest)
212 struct irq_desc *desc = irq_data_to_desc(data);
214 irqd_set_move_pending(data);
215 irq_copy_pending(desc, dest);
219 static inline int irq_set_affinity_pending(struct irq_data *data,
220 const struct cpumask *dest)
226 static int irq_try_set_affinity(struct irq_data *data,
227 const struct cpumask *dest, bool force)
229 int ret = irq_do_set_affinity(data, dest, force);
232 * In case that the underlying vector management is busy and the
233 * architecture supports the generic pending mechanism then utilize
234 * this to avoid returning an error to user space.
236 if (ret == -EBUSY && !force)
237 ret = irq_set_affinity_pending(data, dest);
241 int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
244 struct irq_chip *chip = irq_data_get_irq_chip(data);
245 struct irq_desc *desc = irq_data_to_desc(data);
248 if (!chip || !chip->irq_set_affinity)
251 if (irq_can_move_pcntxt(data) && !irqd_is_setaffinity_pending(data)) {
252 ret = irq_try_set_affinity(data, mask, force);
254 irqd_set_move_pending(data);
255 irq_copy_pending(desc, mask);
258 if (desc->affinity_notify) {
259 kref_get(&desc->affinity_notify->kref);
260 schedule_work(&desc->affinity_notify->work);
262 irqd_set(data, IRQD_AFFINITY_SET);
267 int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force)
269 struct irq_desc *desc = irq_to_desc(irq);
276 raw_spin_lock_irqsave(&desc->lock, flags);
277 ret = irq_set_affinity_locked(irq_desc_get_irq_data(desc), mask, force);
278 raw_spin_unlock_irqrestore(&desc->lock, flags);
282 int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m)
285 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
289 desc->affinity_hint = m;
290 irq_put_desc_unlock(desc, flags);
291 /* set the initial affinity to prevent every interrupt being on CPU0 */
293 __irq_set_affinity(irq, m, false);
296 EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
298 static void irq_affinity_notify(struct work_struct *work)
300 struct irq_affinity_notify *notify =
301 container_of(work, struct irq_affinity_notify, work);
302 struct irq_desc *desc = irq_to_desc(notify->irq);
303 cpumask_var_t cpumask;
306 if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL))
309 raw_spin_lock_irqsave(&desc->lock, flags);
310 if (irq_move_pending(&desc->irq_data))
311 irq_get_pending(cpumask, desc);
313 cpumask_copy(cpumask, desc->irq_common_data.affinity);
314 raw_spin_unlock_irqrestore(&desc->lock, flags);
316 notify->notify(notify, cpumask);
318 free_cpumask_var(cpumask);
320 kref_put(¬ify->kref, notify->release);
324 * irq_set_affinity_notifier - control notification of IRQ affinity changes
325 * @irq: Interrupt for which to enable/disable notification
326 * @notify: Context for notification, or %NULL to disable
327 * notification. Function pointers must be initialised;
328 * the other fields will be initialised by this function.
330 * Must be called in process context. Notification may only be enabled
331 * after the IRQ is allocated and must be disabled before the IRQ is
332 * freed using free_irq().
335 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
337 struct irq_desc *desc = irq_to_desc(irq);
338 struct irq_affinity_notify *old_notify;
341 /* The release function is promised process context */
344 if (!desc || desc->istate & IRQS_NMI)
347 /* Complete initialisation of *notify */
350 kref_init(¬ify->kref);
351 INIT_WORK(¬ify->work, irq_affinity_notify);
354 raw_spin_lock_irqsave(&desc->lock, flags);
355 old_notify = desc->affinity_notify;
356 desc->affinity_notify = notify;
357 raw_spin_unlock_irqrestore(&desc->lock, flags);
360 kref_put(&old_notify->kref, old_notify->release);
364 EXPORT_SYMBOL_GPL(irq_set_affinity_notifier);
366 #ifndef CONFIG_AUTO_IRQ_AFFINITY
368 * Generic version of the affinity autoselector.
370 int irq_setup_affinity(struct irq_desc *desc)
372 struct cpumask *set = irq_default_affinity;
373 int ret, node = irq_desc_get_node(desc);
374 static DEFINE_RAW_SPINLOCK(mask_lock);
375 static struct cpumask mask;
377 /* Excludes PER_CPU and NO_BALANCE interrupts */
378 if (!__irq_can_set_affinity(desc))
381 raw_spin_lock(&mask_lock);
383 * Preserve the managed affinity setting and a userspace affinity
384 * setup, but make sure that one of the targets is online.
386 if (irqd_affinity_is_managed(&desc->irq_data) ||
387 irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) {
388 if (cpumask_intersects(desc->irq_common_data.affinity,
390 set = desc->irq_common_data.affinity;
392 irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET);
395 cpumask_and(&mask, cpu_online_mask, set);
396 if (cpumask_empty(&mask))
397 cpumask_copy(&mask, cpu_online_mask);
399 if (node != NUMA_NO_NODE) {
400 const struct cpumask *nodemask = cpumask_of_node(node);
402 /* make sure at least one of the cpus in nodemask is online */
403 if (cpumask_intersects(&mask, nodemask))
404 cpumask_and(&mask, &mask, nodemask);
406 ret = irq_do_set_affinity(&desc->irq_data, &mask, false);
407 raw_spin_unlock(&mask_lock);
411 /* Wrapper for ALPHA specific affinity selector magic */
412 int irq_setup_affinity(struct irq_desc *desc)
414 return irq_select_affinity(irq_desc_get_irq(desc));
419 * Called when a bogus affinity is set via /proc/irq
421 int irq_select_affinity_usr(unsigned int irq)
423 struct irq_desc *desc = irq_to_desc(irq);
427 raw_spin_lock_irqsave(&desc->lock, flags);
428 ret = irq_setup_affinity(desc);
429 raw_spin_unlock_irqrestore(&desc->lock, flags);
435 * irq_set_vcpu_affinity - Set vcpu affinity for the interrupt
436 * @irq: interrupt number to set affinity
437 * @vcpu_info: vCPU specific data or pointer to a percpu array of vCPU
438 * specific data for percpu_devid interrupts
440 * This function uses the vCPU specific data to set the vCPU
441 * affinity for an irq. The vCPU specific data is passed from
442 * outside, such as KVM. One example code path is as below:
443 * KVM -> IOMMU -> irq_set_vcpu_affinity().
445 int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
448 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
449 struct irq_data *data;
450 struct irq_chip *chip;
456 data = irq_desc_get_irq_data(desc);
458 chip = irq_data_get_irq_chip(data);
459 if (chip && chip->irq_set_vcpu_affinity)
461 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
462 data = data->parent_data;
469 ret = chip->irq_set_vcpu_affinity(data, vcpu_info);
470 irq_put_desc_unlock(desc, flags);
474 EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity);
476 void __disable_irq(struct irq_desc *desc)
482 static int __disable_irq_nosync(unsigned int irq)
485 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
490 irq_put_desc_busunlock(desc, flags);
495 * disable_irq_nosync - disable an irq without waiting
496 * @irq: Interrupt to disable
498 * Disable the selected interrupt line. Disables and Enables are
500 * Unlike disable_irq(), this function does not ensure existing
501 * instances of the IRQ handler have completed before returning.
503 * This function may be called from IRQ context.
505 void disable_irq_nosync(unsigned int irq)
507 __disable_irq_nosync(irq);
509 EXPORT_SYMBOL(disable_irq_nosync);
512 * disable_irq - disable an irq and wait for completion
513 * @irq: Interrupt to disable
515 * Disable the selected interrupt line. Enables and Disables are
517 * This function waits for any pending IRQ handlers for this interrupt
518 * to complete before returning. If you use this function while
519 * holding a resource the IRQ handler may need you will deadlock.
521 * This function may be called - with care - from IRQ context.
523 void disable_irq(unsigned int irq)
525 if (!__disable_irq_nosync(irq))
526 synchronize_irq(irq);
528 EXPORT_SYMBOL(disable_irq);
531 * disable_hardirq - disables an irq and waits for hardirq completion
532 * @irq: Interrupt to disable
534 * Disable the selected interrupt line. Enables and Disables are
536 * This function waits for any pending hard IRQ handlers for this
537 * interrupt to complete before returning. If you use this function while
538 * holding a resource the hard IRQ handler may need you will deadlock.
540 * When used to optimistically disable an interrupt from atomic context
541 * the return value must be checked.
543 * Returns: false if a threaded handler is active.
545 * This function may be called - with care - from IRQ context.
547 bool disable_hardirq(unsigned int irq)
549 if (!__disable_irq_nosync(irq))
550 return synchronize_hardirq(irq);
554 EXPORT_SYMBOL_GPL(disable_hardirq);
557 * disable_nmi_nosync - disable an nmi without waiting
558 * @irq: Interrupt to disable
560 * Disable the selected interrupt line. Disables and enables are
562 * The interrupt to disable must have been requested through request_nmi.
563 * Unlike disable_nmi(), this function does not ensure existing
564 * instances of the IRQ handler have completed before returning.
566 void disable_nmi_nosync(unsigned int irq)
568 disable_irq_nosync(irq);
571 void __enable_irq(struct irq_desc *desc)
573 switch (desc->depth) {
576 WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n",
577 irq_desc_get_irq(desc));
580 if (desc->istate & IRQS_SUSPENDED)
582 /* Prevent probing on this irq: */
583 irq_settings_set_noprobe(desc);
585 * Call irq_startup() not irq_enable() here because the
586 * interrupt might be marked NOAUTOEN. So irq_startup()
587 * needs to be invoked when it gets enabled the first
588 * time. If it was already started up, then irq_startup()
589 * will invoke irq_enable() under the hood.
591 irq_startup(desc, IRQ_RESEND, IRQ_START_FORCE);
600 * enable_irq - enable handling of an irq
601 * @irq: Interrupt to enable
603 * Undoes the effect of one call to disable_irq(). If this
604 * matches the last disable, processing of interrupts on this
605 * IRQ line is re-enabled.
607 * This function may be called from IRQ context only when
608 * desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL !
610 void enable_irq(unsigned int irq)
613 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
617 if (WARN(!desc->irq_data.chip,
618 KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq))
623 irq_put_desc_busunlock(desc, flags);
625 EXPORT_SYMBOL(enable_irq);
628 * enable_nmi - enable handling of an nmi
629 * @irq: Interrupt to enable
631 * The interrupt to enable must have been requested through request_nmi.
632 * Undoes the effect of one call to disable_nmi(). If this
633 * matches the last disable, processing of interrupts on this
634 * IRQ line is re-enabled.
636 void enable_nmi(unsigned int irq)
641 static int set_irq_wake_real(unsigned int irq, unsigned int on)
643 struct irq_desc *desc = irq_to_desc(irq);
646 if (irq_desc_get_chip(desc)->flags & IRQCHIP_SKIP_SET_WAKE)
649 if (desc->irq_data.chip->irq_set_wake)
650 ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on);
656 * irq_set_irq_wake - control irq power management wakeup
657 * @irq: interrupt to control
658 * @on: enable/disable power management wakeup
660 * Enable/disable power management wakeup mode, which is
661 * disabled by default. Enables and disables must match,
662 * just as they match for non-wakeup mode support.
664 * Wakeup mode lets this IRQ wake the system from sleep
665 * states like "suspend to RAM".
667 int irq_set_irq_wake(unsigned int irq, unsigned int on)
670 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
676 /* Don't use NMIs as wake up interrupts please */
677 if (desc->istate & IRQS_NMI) {
682 /* wakeup-capable irqs can be shared between drivers that
683 * don't need to have the same sleep mode behaviors.
686 if (desc->wake_depth++ == 0) {
687 ret = set_irq_wake_real(irq, on);
689 desc->wake_depth = 0;
691 irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE);
694 if (desc->wake_depth == 0) {
695 WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
696 } else if (--desc->wake_depth == 0) {
697 ret = set_irq_wake_real(irq, on);
699 desc->wake_depth = 1;
701 irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE);
706 irq_put_desc_busunlock(desc, flags);
709 EXPORT_SYMBOL(irq_set_irq_wake);
712 * Internal function that tells the architecture code whether a
713 * particular irq has been exclusively allocated or is available
716 int can_request_irq(unsigned int irq, unsigned long irqflags)
719 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
725 if (irq_settings_can_request(desc)) {
727 irqflags & desc->action->flags & IRQF_SHARED)
730 irq_put_desc_unlock(desc, flags);
734 int __irq_set_trigger(struct irq_desc *desc, unsigned long flags)
736 struct irq_chip *chip = desc->irq_data.chip;
739 if (!chip || !chip->irq_set_type) {
741 * IRQF_TRIGGER_* but the PIC does not support multiple
744 pr_debug("No set_type function for IRQ %d (%s)\n",
745 irq_desc_get_irq(desc),
746 chip ? (chip->name ? : "unknown") : "unknown");
750 if (chip->flags & IRQCHIP_SET_TYPE_MASKED) {
751 if (!irqd_irq_masked(&desc->irq_data))
753 if (!irqd_irq_disabled(&desc->irq_data))
757 /* Mask all flags except trigger mode */
758 flags &= IRQ_TYPE_SENSE_MASK;
759 ret = chip->irq_set_type(&desc->irq_data, flags);
762 case IRQ_SET_MASK_OK:
763 case IRQ_SET_MASK_OK_DONE:
764 irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK);
765 irqd_set(&desc->irq_data, flags);
768 case IRQ_SET_MASK_OK_NOCOPY:
769 flags = irqd_get_trigger_type(&desc->irq_data);
770 irq_settings_set_trigger_mask(desc, flags);
771 irqd_clear(&desc->irq_data, IRQD_LEVEL);
772 irq_settings_clr_level(desc);
773 if (flags & IRQ_TYPE_LEVEL_MASK) {
774 irq_settings_set_level(desc);
775 irqd_set(&desc->irq_data, IRQD_LEVEL);
781 pr_err("Setting trigger mode %lu for irq %u failed (%pF)\n",
782 flags, irq_desc_get_irq(desc), chip->irq_set_type);
789 #ifdef CONFIG_HARDIRQS_SW_RESEND
790 int irq_set_parent(int irq, int parent_irq)
793 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
798 desc->parent_irq = parent_irq;
800 irq_put_desc_unlock(desc, flags);
803 EXPORT_SYMBOL_GPL(irq_set_parent);
807 * Default primary interrupt handler for threaded interrupts. Is
808 * assigned as primary handler when request_threaded_irq is called
809 * with handler == NULL. Useful for oneshot interrupts.
811 static irqreturn_t irq_default_primary_handler(int irq, void *dev_id)
813 return IRQ_WAKE_THREAD;
817 * Primary handler for nested threaded interrupts. Should never be
820 static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id)
822 WARN(1, "Primary handler called for nested irq %d\n", irq);
826 static irqreturn_t irq_forced_secondary_handler(int irq, void *dev_id)
828 WARN(1, "Secondary action handler called for irq %d\n", irq);
832 static int irq_wait_for_interrupt(struct irqaction *action)
835 set_current_state(TASK_INTERRUPTIBLE);
837 if (kthread_should_stop()) {
838 /* may need to run one last time */
839 if (test_and_clear_bit(IRQTF_RUNTHREAD,
840 &action->thread_flags)) {
841 __set_current_state(TASK_RUNNING);
844 __set_current_state(TASK_RUNNING);
848 if (test_and_clear_bit(IRQTF_RUNTHREAD,
849 &action->thread_flags)) {
850 __set_current_state(TASK_RUNNING);
858 * Oneshot interrupts keep the irq line masked until the threaded
859 * handler finished. unmask if the interrupt has not been disabled and
862 static void irq_finalize_oneshot(struct irq_desc *desc,
863 struct irqaction *action)
865 if (!(desc->istate & IRQS_ONESHOT) ||
866 action->handler == irq_forced_secondary_handler)
870 raw_spin_lock_irq(&desc->lock);
873 * Implausible though it may be we need to protect us against
874 * the following scenario:
876 * The thread is faster done than the hard interrupt handler
877 * on the other CPU. If we unmask the irq line then the
878 * interrupt can come in again and masks the line, leaves due
879 * to IRQS_INPROGRESS and the irq line is masked forever.
881 * This also serializes the state of shared oneshot handlers
882 * versus "desc->threads_onehsot |= action->thread_mask;" in
883 * irq_wake_thread(). See the comment there which explains the
886 if (unlikely(irqd_irq_inprogress(&desc->irq_data))) {
887 raw_spin_unlock_irq(&desc->lock);
888 chip_bus_sync_unlock(desc);
894 * Now check again, whether the thread should run. Otherwise
895 * we would clear the threads_oneshot bit of this thread which
898 if (test_bit(IRQTF_RUNTHREAD, &action->thread_flags))
901 desc->threads_oneshot &= ~action->thread_mask;
903 if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) &&
904 irqd_irq_masked(&desc->irq_data))
905 unmask_threaded_irq(desc);
908 raw_spin_unlock_irq(&desc->lock);
909 chip_bus_sync_unlock(desc);
914 * Check whether we need to change the affinity of the interrupt thread.
917 irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
922 if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags))
926 * In case we are out of memory we set IRQTF_AFFINITY again and
927 * try again next time
929 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) {
930 set_bit(IRQTF_AFFINITY, &action->thread_flags);
934 raw_spin_lock_irq(&desc->lock);
936 * This code is triggered unconditionally. Check the affinity
937 * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out.
939 if (cpumask_available(desc->irq_common_data.affinity)) {
940 const struct cpumask *m;
942 m = irq_data_get_effective_affinity_mask(&desc->irq_data);
943 cpumask_copy(mask, m);
947 raw_spin_unlock_irq(&desc->lock);
950 set_cpus_allowed_ptr(current, mask);
951 free_cpumask_var(mask);
955 irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
959 * Interrupts which are not explicitly requested as threaded
960 * interrupts rely on the implicit bh/preempt disable of the hard irq
961 * context. So we need to disable bh here to avoid deadlocks and other
965 irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action)
970 ret = action->thread_fn(action->irq, action->dev_id);
971 if (ret == IRQ_HANDLED)
972 atomic_inc(&desc->threads_handled);
974 irq_finalize_oneshot(desc, action);
980 * Interrupts explicitly requested as threaded interrupts want to be
981 * preemtible - many of them need to sleep and wait for slow busses to
984 static irqreturn_t irq_thread_fn(struct irq_desc *desc,
985 struct irqaction *action)
989 ret = action->thread_fn(action->irq, action->dev_id);
990 if (ret == IRQ_HANDLED)
991 atomic_inc(&desc->threads_handled);
993 irq_finalize_oneshot(desc, action);
997 static void wake_threads_waitq(struct irq_desc *desc)
999 if (atomic_dec_and_test(&desc->threads_active))
1000 wake_up(&desc->wait_for_threads);
1003 static void irq_thread_dtor(struct callback_head *unused)
1005 struct task_struct *tsk = current;
1006 struct irq_desc *desc;
1007 struct irqaction *action;
1009 if (WARN_ON_ONCE(!(current->flags & PF_EXITING)))
1012 action = kthread_data(tsk);
1014 pr_err("exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n",
1015 tsk->comm, tsk->pid, action->irq);
1018 desc = irq_to_desc(action->irq);
1020 * If IRQTF_RUNTHREAD is set, we need to decrement
1021 * desc->threads_active and wake possible waiters.
1023 if (test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags))
1024 wake_threads_waitq(desc);
1026 /* Prevent a stale desc->threads_oneshot */
1027 irq_finalize_oneshot(desc, action);
1030 static void irq_wake_secondary(struct irq_desc *desc, struct irqaction *action)
1032 struct irqaction *secondary = action->secondary;
1034 if (WARN_ON_ONCE(!secondary))
1037 raw_spin_lock_irq(&desc->lock);
1038 __irq_wake_thread(desc, secondary);
1039 raw_spin_unlock_irq(&desc->lock);
1043 * Interrupt handler thread
1045 static int irq_thread(void *data)
1047 struct callback_head on_exit_work;
1048 struct irqaction *action = data;
1049 struct irq_desc *desc = irq_to_desc(action->irq);
1050 irqreturn_t (*handler_fn)(struct irq_desc *desc,
1051 struct irqaction *action);
1053 if (force_irqthreads && test_bit(IRQTF_FORCED_THREAD,
1054 &action->thread_flags))
1055 handler_fn = irq_forced_thread_fn;
1057 handler_fn = irq_thread_fn;
1059 init_task_work(&on_exit_work, irq_thread_dtor);
1060 task_work_add(current, &on_exit_work, false);
1062 irq_thread_check_affinity(desc, action);
1064 while (!irq_wait_for_interrupt(action)) {
1065 irqreturn_t action_ret;
1067 irq_thread_check_affinity(desc, action);
1069 action_ret = handler_fn(desc, action);
1070 if (action_ret == IRQ_WAKE_THREAD)
1071 irq_wake_secondary(desc, action);
1073 wake_threads_waitq(desc);
1077 * This is the regular exit path. __free_irq() is stopping the
1078 * thread via kthread_stop() after calling
1079 * synchronize_hardirq(). So neither IRQTF_RUNTHREAD nor the
1080 * oneshot mask bit can be set.
1082 task_work_cancel(current, irq_thread_dtor);
1087 * irq_wake_thread - wake the irq thread for the action identified by dev_id
1088 * @irq: Interrupt line
1089 * @dev_id: Device identity for which the thread should be woken
1092 void irq_wake_thread(unsigned int irq, void *dev_id)
1094 struct irq_desc *desc = irq_to_desc(irq);
1095 struct irqaction *action;
1096 unsigned long flags;
1098 if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1101 raw_spin_lock_irqsave(&desc->lock, flags);
1102 for_each_action_of_desc(desc, action) {
1103 if (action->dev_id == dev_id) {
1105 __irq_wake_thread(desc, action);
1109 raw_spin_unlock_irqrestore(&desc->lock, flags);
1111 EXPORT_SYMBOL_GPL(irq_wake_thread);
1113 static int irq_setup_forced_threading(struct irqaction *new)
1115 if (!force_irqthreads)
1117 if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT))
1121 * No further action required for interrupts which are requested as
1122 * threaded interrupts already
1124 if (new->handler == irq_default_primary_handler)
1127 new->flags |= IRQF_ONESHOT;
1130 * Handle the case where we have a real primary handler and a
1131 * thread handler. We force thread them as well by creating a
1134 if (new->handler && new->thread_fn) {
1135 /* Allocate the secondary action */
1136 new->secondary = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
1137 if (!new->secondary)
1139 new->secondary->handler = irq_forced_secondary_handler;
1140 new->secondary->thread_fn = new->thread_fn;
1141 new->secondary->dev_id = new->dev_id;
1142 new->secondary->irq = new->irq;
1143 new->secondary->name = new->name;
1145 /* Deal with the primary handler */
1146 set_bit(IRQTF_FORCED_THREAD, &new->thread_flags);
1147 new->thread_fn = new->handler;
1148 new->handler = irq_default_primary_handler;
1152 static int irq_request_resources(struct irq_desc *desc)
1154 struct irq_data *d = &desc->irq_data;
1155 struct irq_chip *c = d->chip;
1157 return c->irq_request_resources ? c->irq_request_resources(d) : 0;
1160 static void irq_release_resources(struct irq_desc *desc)
1162 struct irq_data *d = &desc->irq_data;
1163 struct irq_chip *c = d->chip;
1165 if (c->irq_release_resources)
1166 c->irq_release_resources(d);
1169 static bool irq_supports_nmi(struct irq_desc *desc)
1171 struct irq_data *d = irq_desc_get_irq_data(desc);
1173 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1174 /* Only IRQs directly managed by the root irqchip can be set as NMI */
1178 /* Don't support NMIs for chips behind a slow bus */
1179 if (d->chip->irq_bus_lock || d->chip->irq_bus_sync_unlock)
1182 return d->chip->flags & IRQCHIP_SUPPORTS_NMI;
1185 static int irq_nmi_setup(struct irq_desc *desc)
1187 struct irq_data *d = irq_desc_get_irq_data(desc);
1188 struct irq_chip *c = d->chip;
1190 return c->irq_nmi_setup ? c->irq_nmi_setup(d) : -EINVAL;
1193 static void irq_nmi_teardown(struct irq_desc *desc)
1195 struct irq_data *d = irq_desc_get_irq_data(desc);
1196 struct irq_chip *c = d->chip;
1198 if (c->irq_nmi_teardown)
1199 c->irq_nmi_teardown(d);
1203 setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary)
1205 struct task_struct *t;
1206 struct sched_param param = {
1207 .sched_priority = MAX_USER_RT_PRIO/2,
1211 t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
1214 t = kthread_create(irq_thread, new, "irq/%d-s-%s", irq,
1216 param.sched_priority -= 1;
1222 sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m);
1225 * We keep the reference to the task struct even if
1226 * the thread dies to avoid that the interrupt code
1227 * references an already freed task_struct.
1232 * Tell the thread to set its affinity. This is
1233 * important for shared interrupt handlers as we do
1234 * not invoke setup_affinity() for the secondary
1235 * handlers as everything is already set up. Even for
1236 * interrupts marked with IRQF_NO_BALANCE this is
1237 * correct as we want the thread to move to the cpu(s)
1238 * on which the requesting code placed the interrupt.
1240 set_bit(IRQTF_AFFINITY, &new->thread_flags);
1245 * Internal function to register an irqaction - typically used to
1246 * allocate special interrupts that are part of the architecture.
1250 * desc->request_mutex Provides serialization against a concurrent free_irq()
1251 * chip_bus_lock Provides serialization for slow bus operations
1252 * desc->lock Provides serialization against hard interrupts
1254 * chip_bus_lock and desc->lock are sufficient for all other management and
1255 * interrupt related functions. desc->request_mutex solely serializes
1256 * request/free_irq().
1259 __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
1261 struct irqaction *old, **old_ptr;
1262 unsigned long flags, thread_mask = 0;
1263 int ret, nested, shared = 0;
1268 if (desc->irq_data.chip == &no_irq_chip)
1270 if (!try_module_get(desc->owner))
1276 * If the trigger type is not specified by the caller,
1277 * then use the default for this interrupt.
1279 if (!(new->flags & IRQF_TRIGGER_MASK))
1280 new->flags |= irqd_get_trigger_type(&desc->irq_data);
1283 * Check whether the interrupt nests into another interrupt
1286 nested = irq_settings_is_nested_thread(desc);
1288 if (!new->thread_fn) {
1293 * Replace the primary handler which was provided from
1294 * the driver for non nested interrupt handling by the
1295 * dummy function which warns when called.
1297 new->handler = irq_nested_primary_handler;
1299 if (irq_settings_can_thread(desc)) {
1300 ret = irq_setup_forced_threading(new);
1307 * Create a handler thread when a thread function is supplied
1308 * and the interrupt does not nest into another interrupt
1311 if (new->thread_fn && !nested) {
1312 ret = setup_irq_thread(new, irq, false);
1315 if (new->secondary) {
1316 ret = setup_irq_thread(new->secondary, irq, true);
1323 * Drivers are often written to work w/o knowledge about the
1324 * underlying irq chip implementation, so a request for a
1325 * threaded irq without a primary hard irq context handler
1326 * requires the ONESHOT flag to be set. Some irq chips like
1327 * MSI based interrupts are per se one shot safe. Check the
1328 * chip flags, so we can avoid the unmask dance at the end of
1329 * the threaded handler for those.
1331 if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)
1332 new->flags &= ~IRQF_ONESHOT;
1335 * Protects against a concurrent __free_irq() call which might wait
1336 * for synchronize_hardirq() to complete without holding the optional
1337 * chip bus lock and desc->lock. Also protects against handing out
1338 * a recycled oneshot thread_mask bit while it's still in use by
1339 * its previous owner.
1341 mutex_lock(&desc->request_mutex);
1344 * Acquire bus lock as the irq_request_resources() callback below
1345 * might rely on the serialization or the magic power management
1346 * functions which are abusing the irq_bus_lock() callback,
1348 chip_bus_lock(desc);
1350 /* First installed action requests resources. */
1351 if (!desc->action) {
1352 ret = irq_request_resources(desc);
1354 pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n",
1355 new->name, irq, desc->irq_data.chip->name);
1356 goto out_bus_unlock;
1361 * The following block of code has to be executed atomically
1362 * protected against a concurrent interrupt and any of the other
1363 * management calls which are not serialized via
1364 * desc->request_mutex or the optional bus lock.
1366 raw_spin_lock_irqsave(&desc->lock, flags);
1367 old_ptr = &desc->action;
1371 * Can't share interrupts unless both agree to and are
1372 * the same type (level, edge, polarity). So both flag
1373 * fields must have IRQF_SHARED set and the bits which
1374 * set the trigger type must match. Also all must
1376 * Interrupt lines used for NMIs cannot be shared.
1378 unsigned int oldtype;
1380 if (desc->istate & IRQS_NMI) {
1381 pr_err("Invalid attempt to share NMI for %s (irq %d) on irqchip %s.\n",
1382 new->name, irq, desc->irq_data.chip->name);
1388 * If nobody did set the configuration before, inherit
1389 * the one provided by the requester.
1391 if (irqd_trigger_type_was_set(&desc->irq_data)) {
1392 oldtype = irqd_get_trigger_type(&desc->irq_data);
1394 oldtype = new->flags & IRQF_TRIGGER_MASK;
1395 irqd_set_trigger_type(&desc->irq_data, oldtype);
1398 if (!((old->flags & new->flags) & IRQF_SHARED) ||
1399 (oldtype != (new->flags & IRQF_TRIGGER_MASK)) ||
1400 ((old->flags ^ new->flags) & IRQF_ONESHOT))
1403 /* All handlers must agree on per-cpuness */
1404 if ((old->flags & IRQF_PERCPU) !=
1405 (new->flags & IRQF_PERCPU))
1408 /* add new interrupt at end of irq queue */
1411 * Or all existing action->thread_mask bits,
1412 * so we can find the next zero bit for this
1415 thread_mask |= old->thread_mask;
1416 old_ptr = &old->next;
1423 * Setup the thread mask for this irqaction for ONESHOT. For
1424 * !ONESHOT irqs the thread mask is 0 so we can avoid a
1425 * conditional in irq_wake_thread().
1427 if (new->flags & IRQF_ONESHOT) {
1429 * Unlikely to have 32 resp 64 irqs sharing one line,
1432 if (thread_mask == ~0UL) {
1437 * The thread_mask for the action is or'ed to
1438 * desc->thread_active to indicate that the
1439 * IRQF_ONESHOT thread handler has been woken, but not
1440 * yet finished. The bit is cleared when a thread
1441 * completes. When all threads of a shared interrupt
1442 * line have completed desc->threads_active becomes
1443 * zero and the interrupt line is unmasked. See
1444 * handle.c:irq_wake_thread() for further information.
1446 * If no thread is woken by primary (hard irq context)
1447 * interrupt handlers, then desc->threads_active is
1448 * also checked for zero to unmask the irq line in the
1449 * affected hard irq flow handlers
1450 * (handle_[fasteoi|level]_irq).
1452 * The new action gets the first zero bit of
1453 * thread_mask assigned. See the loop above which or's
1454 * all existing action->thread_mask bits.
1456 new->thread_mask = 1UL << ffz(thread_mask);
1458 } else if (new->handler == irq_default_primary_handler &&
1459 !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) {
1461 * The interrupt was requested with handler = NULL, so
1462 * we use the default primary handler for it. But it
1463 * does not have the oneshot flag set. In combination
1464 * with level interrupts this is deadly, because the
1465 * default primary handler just wakes the thread, then
1466 * the irq lines is reenabled, but the device still
1467 * has the level irq asserted. Rinse and repeat....
1469 * While this works for edge type interrupts, we play
1470 * it safe and reject unconditionally because we can't
1471 * say for sure which type this interrupt really
1472 * has. The type flags are unreliable as the
1473 * underlying chip implementation can override them.
1475 pr_err("Threaded irq requested with handler=NULL and !ONESHOT for irq %d\n",
1482 init_waitqueue_head(&desc->wait_for_threads);
1484 /* Setup the type (level, edge polarity) if configured: */
1485 if (new->flags & IRQF_TRIGGER_MASK) {
1486 ret = __irq_set_trigger(desc,
1487 new->flags & IRQF_TRIGGER_MASK);
1494 * Activate the interrupt. That activation must happen
1495 * independently of IRQ_NOAUTOEN. request_irq() can fail
1496 * and the callers are supposed to handle
1497 * that. enable_irq() of an interrupt requested with
1498 * IRQ_NOAUTOEN is not supposed to fail. The activation
1499 * keeps it in shutdown mode, it merily associates
1500 * resources if necessary and if that's not possible it
1501 * fails. Interrupts which are in managed shutdown mode
1502 * will simply ignore that activation request.
1504 ret = irq_activate(desc);
1508 desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \
1509 IRQS_ONESHOT | IRQS_WAITING);
1510 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
1512 if (new->flags & IRQF_PERCPU) {
1513 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1514 irq_settings_set_per_cpu(desc);
1517 if (new->flags & IRQF_ONESHOT)
1518 desc->istate |= IRQS_ONESHOT;
1520 /* Exclude IRQ from balancing if requested */
1521 if (new->flags & IRQF_NOBALANCING) {
1522 irq_settings_set_no_balancing(desc);
1523 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1526 if (irq_settings_can_autoenable(desc)) {
1527 irq_startup(desc, IRQ_RESEND, IRQ_START_COND);
1530 * Shared interrupts do not go well with disabling
1531 * auto enable. The sharing interrupt might request
1532 * it while it's still disabled and then wait for
1533 * interrupts forever.
1535 WARN_ON_ONCE(new->flags & IRQF_SHARED);
1536 /* Undo nested disables: */
1540 } else if (new->flags & IRQF_TRIGGER_MASK) {
1541 unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK;
1542 unsigned int omsk = irqd_get_trigger_type(&desc->irq_data);
1545 /* hope the handler works with current trigger mode */
1546 pr_warn("irq %d uses trigger mode %u; requested %u\n",
1552 irq_pm_install_action(desc, new);
1554 /* Reset broken irq detection when installing new handler */
1555 desc->irq_count = 0;
1556 desc->irqs_unhandled = 0;
1559 * Check whether we disabled the irq via the spurious handler
1560 * before. Reenable it and give it another chance.
1562 if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) {
1563 desc->istate &= ~IRQS_SPURIOUS_DISABLED;
1567 raw_spin_unlock_irqrestore(&desc->lock, flags);
1568 chip_bus_sync_unlock(desc);
1569 mutex_unlock(&desc->request_mutex);
1571 irq_setup_timings(desc, new);
1574 * Strictly no need to wake it up, but hung_task complains
1575 * when no hard interrupt wakes the thread up.
1578 wake_up_process(new->thread);
1580 wake_up_process(new->secondary->thread);
1582 register_irq_proc(irq, desc);
1584 register_handler_proc(irq, new);
1588 if (!(new->flags & IRQF_PROBE_SHARED)) {
1589 pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n",
1590 irq, new->flags, new->name, old->flags, old->name);
1591 #ifdef CONFIG_DEBUG_SHIRQ
1598 raw_spin_unlock_irqrestore(&desc->lock, flags);
1601 irq_release_resources(desc);
1603 chip_bus_sync_unlock(desc);
1604 mutex_unlock(&desc->request_mutex);
1608 struct task_struct *t = new->thread;
1614 if (new->secondary && new->secondary->thread) {
1615 struct task_struct *t = new->secondary->thread;
1617 new->secondary->thread = NULL;
1622 module_put(desc->owner);
1627 * setup_irq - setup an interrupt
1628 * @irq: Interrupt line to setup
1629 * @act: irqaction for the interrupt
1631 * Used to statically setup interrupts in the early boot process.
1633 int setup_irq(unsigned int irq, struct irqaction *act)
1636 struct irq_desc *desc = irq_to_desc(irq);
1638 if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1641 retval = irq_chip_pm_get(&desc->irq_data);
1645 retval = __setup_irq(irq, desc, act);
1648 irq_chip_pm_put(&desc->irq_data);
1652 EXPORT_SYMBOL_GPL(setup_irq);
1655 * Internal function to unregister an irqaction - used to free
1656 * regular and special interrupts that are part of the architecture.
1658 static struct irqaction *__free_irq(struct irq_desc *desc, void *dev_id)
1660 unsigned irq = desc->irq_data.irq;
1661 struct irqaction *action, **action_ptr;
1662 unsigned long flags;
1664 WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
1666 mutex_lock(&desc->request_mutex);
1667 chip_bus_lock(desc);
1668 raw_spin_lock_irqsave(&desc->lock, flags);
1671 * There can be multiple actions per IRQ descriptor, find the right
1672 * one based on the dev_id:
1674 action_ptr = &desc->action;
1676 action = *action_ptr;
1679 WARN(1, "Trying to free already-free IRQ %d\n", irq);
1680 raw_spin_unlock_irqrestore(&desc->lock, flags);
1681 chip_bus_sync_unlock(desc);
1682 mutex_unlock(&desc->request_mutex);
1686 if (action->dev_id == dev_id)
1688 action_ptr = &action->next;
1691 /* Found it - now remove it from the list of entries: */
1692 *action_ptr = action->next;
1694 irq_pm_remove_action(desc, action);
1696 /* If this was the last handler, shut down the IRQ line: */
1697 if (!desc->action) {
1698 irq_settings_clr_disable_unlazy(desc);
1703 /* make sure affinity_hint is cleaned up */
1704 if (WARN_ON_ONCE(desc->affinity_hint))
1705 desc->affinity_hint = NULL;
1708 raw_spin_unlock_irqrestore(&desc->lock, flags);
1710 * Drop bus_lock here so the changes which were done in the chip
1711 * callbacks above are synced out to the irq chips which hang
1712 * behind a slow bus (I2C, SPI) before calling synchronize_hardirq().
1714 * Aside of that the bus_lock can also be taken from the threaded
1715 * handler in irq_finalize_oneshot() which results in a deadlock
1716 * because kthread_stop() would wait forever for the thread to
1717 * complete, which is blocked on the bus lock.
1719 * The still held desc->request_mutex() protects against a
1720 * concurrent request_irq() of this irq so the release of resources
1721 * and timing data is properly serialized.
1723 chip_bus_sync_unlock(desc);
1725 unregister_handler_proc(irq, action);
1727 /* Make sure it's not being used on another CPU: */
1728 synchronize_hardirq(irq);
1730 #ifdef CONFIG_DEBUG_SHIRQ
1732 * It's a shared IRQ -- the driver ought to be prepared for an IRQ
1733 * event to happen even now it's being freed, so let's make sure that
1734 * is so by doing an extra call to the handler ....
1736 * ( We do this after actually deregistering it, to make sure that a
1737 * 'real' IRQ doesn't run in parallel with our fake. )
1739 if (action->flags & IRQF_SHARED) {
1740 local_irq_save(flags);
1741 action->handler(irq, dev_id);
1742 local_irq_restore(flags);
1747 * The action has already been removed above, but the thread writes
1748 * its oneshot mask bit when it completes. Though request_mutex is
1749 * held across this which prevents __setup_irq() from handing out
1750 * the same bit to a newly requested action.
1752 if (action->thread) {
1753 kthread_stop(action->thread);
1754 put_task_struct(action->thread);
1755 if (action->secondary && action->secondary->thread) {
1756 kthread_stop(action->secondary->thread);
1757 put_task_struct(action->secondary->thread);
1761 /* Last action releases resources */
1762 if (!desc->action) {
1764 * Reaquire bus lock as irq_release_resources() might
1765 * require it to deallocate resources over the slow bus.
1767 chip_bus_lock(desc);
1768 irq_release_resources(desc);
1769 chip_bus_sync_unlock(desc);
1770 irq_remove_timings(desc);
1773 mutex_unlock(&desc->request_mutex);
1775 irq_chip_pm_put(&desc->irq_data);
1776 module_put(desc->owner);
1777 kfree(action->secondary);
1782 * remove_irq - free an interrupt
1783 * @irq: Interrupt line to free
1784 * @act: irqaction for the interrupt
1786 * Used to remove interrupts statically setup by the early boot process.
1788 void remove_irq(unsigned int irq, struct irqaction *act)
1790 struct irq_desc *desc = irq_to_desc(irq);
1792 if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1793 __free_irq(desc, act->dev_id);
1795 EXPORT_SYMBOL_GPL(remove_irq);
1798 * free_irq - free an interrupt allocated with request_irq
1799 * @irq: Interrupt line to free
1800 * @dev_id: Device identity to free
1802 * Remove an interrupt handler. The handler is removed and if the
1803 * interrupt line is no longer in use by any driver it is disabled.
1804 * On a shared IRQ the caller must ensure the interrupt is disabled
1805 * on the card it drives before calling this function. The function
1806 * does not return until any executing interrupts for this IRQ
1809 * This function must not be called from interrupt context.
1811 * Returns the devname argument passed to request_irq.
1813 const void *free_irq(unsigned int irq, void *dev_id)
1815 struct irq_desc *desc = irq_to_desc(irq);
1816 struct irqaction *action;
1817 const char *devname;
1819 if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1823 if (WARN_ON(desc->affinity_notify))
1824 desc->affinity_notify = NULL;
1827 action = __free_irq(desc, dev_id);
1832 devname = action->name;
1836 EXPORT_SYMBOL(free_irq);
1838 /* This function must be called with desc->lock held */
1839 static const void *__cleanup_nmi(unsigned int irq, struct irq_desc *desc)
1841 const char *devname = NULL;
1843 desc->istate &= ~IRQS_NMI;
1845 if (!WARN_ON(desc->action == NULL)) {
1846 irq_pm_remove_action(desc, desc->action);
1847 devname = desc->action->name;
1848 unregister_handler_proc(irq, desc->action);
1850 kfree(desc->action);
1851 desc->action = NULL;
1854 irq_settings_clr_disable_unlazy(desc);
1857 irq_release_resources(desc);
1859 irq_chip_pm_put(&desc->irq_data);
1860 module_put(desc->owner);
1865 const void *free_nmi(unsigned int irq, void *dev_id)
1867 struct irq_desc *desc = irq_to_desc(irq);
1868 unsigned long flags;
1869 const void *devname;
1871 if (!desc || WARN_ON(!(desc->istate & IRQS_NMI)))
1874 if (WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1877 /* NMI still enabled */
1878 if (WARN_ON(desc->depth == 0))
1879 disable_nmi_nosync(irq);
1881 raw_spin_lock_irqsave(&desc->lock, flags);
1883 irq_nmi_teardown(desc);
1884 devname = __cleanup_nmi(irq, desc);
1886 raw_spin_unlock_irqrestore(&desc->lock, flags);
1892 * request_threaded_irq - allocate an interrupt line
1893 * @irq: Interrupt line to allocate
1894 * @handler: Function to be called when the IRQ occurs.
1895 * Primary handler for threaded interrupts
1896 * If NULL and thread_fn != NULL the default
1897 * primary handler is installed
1898 * @thread_fn: Function called from the irq handler thread
1899 * If NULL, no irq thread is created
1900 * @irqflags: Interrupt type flags
1901 * @devname: An ascii name for the claiming device
1902 * @dev_id: A cookie passed back to the handler function
1904 * This call allocates interrupt resources and enables the
1905 * interrupt line and IRQ handling. From the point this
1906 * call is made your handler function may be invoked. Since
1907 * your handler function must clear any interrupt the board
1908 * raises, you must take care both to initialise your hardware
1909 * and to set up the interrupt handler in the right order.
1911 * If you want to set up a threaded irq handler for your device
1912 * then you need to supply @handler and @thread_fn. @handler is
1913 * still called in hard interrupt context and has to check
1914 * whether the interrupt originates from the device. If yes it
1915 * needs to disable the interrupt on the device and return
1916 * IRQ_WAKE_THREAD which will wake up the handler thread and run
1917 * @thread_fn. This split handler design is necessary to support
1918 * shared interrupts.
1920 * Dev_id must be globally unique. Normally the address of the
1921 * device data structure is used as the cookie. Since the handler
1922 * receives this value it makes sense to use it.
1924 * If your interrupt is shared you must pass a non NULL dev_id
1925 * as this is required when freeing the interrupt.
1929 * IRQF_SHARED Interrupt is shared
1930 * IRQF_TRIGGER_* Specify active edge(s) or level
1933 int request_threaded_irq(unsigned int irq, irq_handler_t handler,
1934 irq_handler_t thread_fn, unsigned long irqflags,
1935 const char *devname, void *dev_id)
1937 struct irqaction *action;
1938 struct irq_desc *desc;
1941 if (irq == IRQ_NOTCONNECTED)
1945 * Sanity-check: shared interrupts must pass in a real dev-ID,
1946 * otherwise we'll have trouble later trying to figure out
1947 * which interrupt is which (messes up the interrupt freeing
1950 * Also IRQF_COND_SUSPEND only makes sense for shared interrupts and
1951 * it cannot be set along with IRQF_NO_SUSPEND.
1953 if (((irqflags & IRQF_SHARED) && !dev_id) ||
1954 (!(irqflags & IRQF_SHARED) && (irqflags & IRQF_COND_SUSPEND)) ||
1955 ((irqflags & IRQF_NO_SUSPEND) && (irqflags & IRQF_COND_SUSPEND)))
1958 desc = irq_to_desc(irq);
1962 if (!irq_settings_can_request(desc) ||
1963 WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1969 handler = irq_default_primary_handler;
1972 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
1976 action->handler = handler;
1977 action->thread_fn = thread_fn;
1978 action->flags = irqflags;
1979 action->name = devname;
1980 action->dev_id = dev_id;
1982 retval = irq_chip_pm_get(&desc->irq_data);
1988 retval = __setup_irq(irq, desc, action);
1991 irq_chip_pm_put(&desc->irq_data);
1992 kfree(action->secondary);
1996 #ifdef CONFIG_DEBUG_SHIRQ_FIXME
1997 if (!retval && (irqflags & IRQF_SHARED)) {
1999 * It's a shared IRQ -- the driver ought to be prepared for it
2000 * to happen immediately, so let's make sure....
2001 * We disable the irq to make sure that a 'real' IRQ doesn't
2002 * run in parallel with our fake.
2004 unsigned long flags;
2007 local_irq_save(flags);
2009 handler(irq, dev_id);
2011 local_irq_restore(flags);
2017 EXPORT_SYMBOL(request_threaded_irq);
2020 * request_any_context_irq - allocate an interrupt line
2021 * @irq: Interrupt line to allocate
2022 * @handler: Function to be called when the IRQ occurs.
2023 * Threaded handler for threaded interrupts.
2024 * @flags: Interrupt type flags
2025 * @name: An ascii name for the claiming device
2026 * @dev_id: A cookie passed back to the handler function
2028 * This call allocates interrupt resources and enables the
2029 * interrupt line and IRQ handling. It selects either a
2030 * hardirq or threaded handling method depending on the
2033 * On failure, it returns a negative value. On success,
2034 * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED.
2036 int request_any_context_irq(unsigned int irq, irq_handler_t handler,
2037 unsigned long flags, const char *name, void *dev_id)
2039 struct irq_desc *desc;
2042 if (irq == IRQ_NOTCONNECTED)
2045 desc = irq_to_desc(irq);
2049 if (irq_settings_is_nested_thread(desc)) {
2050 ret = request_threaded_irq(irq, NULL, handler,
2051 flags, name, dev_id);
2052 return !ret ? IRQC_IS_NESTED : ret;
2055 ret = request_irq(irq, handler, flags, name, dev_id);
2056 return !ret ? IRQC_IS_HARDIRQ : ret;
2058 EXPORT_SYMBOL_GPL(request_any_context_irq);
2061 * request_nmi - allocate an interrupt line for NMI delivery
2062 * @irq: Interrupt line to allocate
2063 * @handler: Function to be called when the IRQ occurs.
2064 * Threaded handler for threaded interrupts.
2065 * @irqflags: Interrupt type flags
2066 * @name: An ascii name for the claiming device
2067 * @dev_id: A cookie passed back to the handler function
2069 * This call allocates interrupt resources and enables the
2070 * interrupt line and IRQ handling. It sets up the IRQ line
2071 * to be handled as an NMI.
2073 * An interrupt line delivering NMIs cannot be shared and IRQ handling
2074 * cannot be threaded.
2076 * Interrupt lines requested for NMI delivering must produce per cpu
2077 * interrupts and have auto enabling setting disabled.
2079 * Dev_id must be globally unique. Normally the address of the
2080 * device data structure is used as the cookie. Since the handler
2081 * receives this value it makes sense to use it.
2083 * If the interrupt line cannot be used to deliver NMIs, function
2084 * will fail and return a negative value.
2086 int request_nmi(unsigned int irq, irq_handler_t handler,
2087 unsigned long irqflags, const char *name, void *dev_id)
2089 struct irqaction *action;
2090 struct irq_desc *desc;
2091 unsigned long flags;
2094 if (irq == IRQ_NOTCONNECTED)
2097 /* NMI cannot be shared, used for Polling */
2098 if (irqflags & (IRQF_SHARED | IRQF_COND_SUSPEND | IRQF_IRQPOLL))
2101 if (!(irqflags & IRQF_PERCPU))
2107 desc = irq_to_desc(irq);
2109 if (!desc || irq_settings_can_autoenable(desc) ||
2110 !irq_settings_can_request(desc) ||
2111 WARN_ON(irq_settings_is_per_cpu_devid(desc)) ||
2112 !irq_supports_nmi(desc))
2115 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2119 action->handler = handler;
2120 action->flags = irqflags | IRQF_NO_THREAD | IRQF_NOBALANCING;
2121 action->name = name;
2122 action->dev_id = dev_id;
2124 retval = irq_chip_pm_get(&desc->irq_data);
2128 retval = __setup_irq(irq, desc, action);
2132 raw_spin_lock_irqsave(&desc->lock, flags);
2134 /* Setup NMI state */
2135 desc->istate |= IRQS_NMI;
2136 retval = irq_nmi_setup(desc);
2138 __cleanup_nmi(irq, desc);
2139 raw_spin_unlock_irqrestore(&desc->lock, flags);
2143 raw_spin_unlock_irqrestore(&desc->lock, flags);
2148 irq_chip_pm_put(&desc->irq_data);
2155 void enable_percpu_irq(unsigned int irq, unsigned int type)
2157 unsigned int cpu = smp_processor_id();
2158 unsigned long flags;
2159 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
2165 * If the trigger type is not specified by the caller, then
2166 * use the default for this interrupt.
2168 type &= IRQ_TYPE_SENSE_MASK;
2169 if (type == IRQ_TYPE_NONE)
2170 type = irqd_get_trigger_type(&desc->irq_data);
2172 if (type != IRQ_TYPE_NONE) {
2175 ret = __irq_set_trigger(desc, type);
2178 WARN(1, "failed to set type for IRQ%d\n", irq);
2183 irq_percpu_enable(desc, cpu);
2185 irq_put_desc_unlock(desc, flags);
2187 EXPORT_SYMBOL_GPL(enable_percpu_irq);
2189 void enable_percpu_nmi(unsigned int irq, unsigned int type)
2191 enable_percpu_irq(irq, type);
2195 * irq_percpu_is_enabled - Check whether the per cpu irq is enabled
2196 * @irq: Linux irq number to check for
2198 * Must be called from a non migratable context. Returns the enable
2199 * state of a per cpu interrupt on the current cpu.
2201 bool irq_percpu_is_enabled(unsigned int irq)
2203 unsigned int cpu = smp_processor_id();
2204 struct irq_desc *desc;
2205 unsigned long flags;
2208 desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
2212 is_enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
2213 irq_put_desc_unlock(desc, flags);
2217 EXPORT_SYMBOL_GPL(irq_percpu_is_enabled);
2219 void disable_percpu_irq(unsigned int irq)
2221 unsigned int cpu = smp_processor_id();
2222 unsigned long flags;
2223 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
2228 irq_percpu_disable(desc, cpu);
2229 irq_put_desc_unlock(desc, flags);
2231 EXPORT_SYMBOL_GPL(disable_percpu_irq);
2233 void disable_percpu_nmi(unsigned int irq)
2235 disable_percpu_irq(irq);
2239 * Internal function to unregister a percpu irqaction.
2241 static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id)
2243 struct irq_desc *desc = irq_to_desc(irq);
2244 struct irqaction *action;
2245 unsigned long flags;
2247 WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
2252 raw_spin_lock_irqsave(&desc->lock, flags);
2254 action = desc->action;
2255 if (!action || action->percpu_dev_id != dev_id) {
2256 WARN(1, "Trying to free already-free IRQ %d\n", irq);
2260 if (!cpumask_empty(desc->percpu_enabled)) {
2261 WARN(1, "percpu IRQ %d still enabled on CPU%d!\n",
2262 irq, cpumask_first(desc->percpu_enabled));
2266 /* Found it - now remove it from the list of entries: */
2267 desc->action = NULL;
2269 desc->istate &= ~IRQS_NMI;
2271 raw_spin_unlock_irqrestore(&desc->lock, flags);
2273 unregister_handler_proc(irq, action);
2275 irq_chip_pm_put(&desc->irq_data);
2276 module_put(desc->owner);
2280 raw_spin_unlock_irqrestore(&desc->lock, flags);
2285 * remove_percpu_irq - free a per-cpu interrupt
2286 * @irq: Interrupt line to free
2287 * @act: irqaction for the interrupt
2289 * Used to remove interrupts statically setup by the early boot process.
2291 void remove_percpu_irq(unsigned int irq, struct irqaction *act)
2293 struct irq_desc *desc = irq_to_desc(irq);
2295 if (desc && irq_settings_is_per_cpu_devid(desc))
2296 __free_percpu_irq(irq, act->percpu_dev_id);
2300 * free_percpu_irq - free an interrupt allocated with request_percpu_irq
2301 * @irq: Interrupt line to free
2302 * @dev_id: Device identity to free
2304 * Remove a percpu interrupt handler. The handler is removed, but
2305 * the interrupt line is not disabled. This must be done on each
2306 * CPU before calling this function. The function does not return
2307 * until any executing interrupts for this IRQ have completed.
2309 * This function must not be called from interrupt context.
2311 void free_percpu_irq(unsigned int irq, void __percpu *dev_id)
2313 struct irq_desc *desc = irq_to_desc(irq);
2315 if (!desc || !irq_settings_is_per_cpu_devid(desc))
2318 chip_bus_lock(desc);
2319 kfree(__free_percpu_irq(irq, dev_id));
2320 chip_bus_sync_unlock(desc);
2322 EXPORT_SYMBOL_GPL(free_percpu_irq);
2324 void free_percpu_nmi(unsigned int irq, void __percpu *dev_id)
2326 struct irq_desc *desc = irq_to_desc(irq);
2328 if (!desc || !irq_settings_is_per_cpu_devid(desc))
2331 if (WARN_ON(!(desc->istate & IRQS_NMI)))
2334 kfree(__free_percpu_irq(irq, dev_id));
2338 * setup_percpu_irq - setup a per-cpu interrupt
2339 * @irq: Interrupt line to setup
2340 * @act: irqaction for the interrupt
2342 * Used to statically setup per-cpu interrupts in the early boot process.
2344 int setup_percpu_irq(unsigned int irq, struct irqaction *act)
2346 struct irq_desc *desc = irq_to_desc(irq);
2349 if (!desc || !irq_settings_is_per_cpu_devid(desc))
2352 retval = irq_chip_pm_get(&desc->irq_data);
2356 retval = __setup_irq(irq, desc, act);
2359 irq_chip_pm_put(&desc->irq_data);
2365 * __request_percpu_irq - allocate a percpu interrupt line
2366 * @irq: Interrupt line to allocate
2367 * @handler: Function to be called when the IRQ occurs.
2368 * @flags: Interrupt type flags (IRQF_TIMER only)
2369 * @devname: An ascii name for the claiming device
2370 * @dev_id: A percpu cookie passed back to the handler function
2372 * This call allocates interrupt resources and enables the
2373 * interrupt on the local CPU. If the interrupt is supposed to be
2374 * enabled on other CPUs, it has to be done on each CPU using
2375 * enable_percpu_irq().
2377 * Dev_id must be globally unique. It is a per-cpu variable, and
2378 * the handler gets called with the interrupted CPU's instance of
2381 int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
2382 unsigned long flags, const char *devname,
2383 void __percpu *dev_id)
2385 struct irqaction *action;
2386 struct irq_desc *desc;
2392 desc = irq_to_desc(irq);
2393 if (!desc || !irq_settings_can_request(desc) ||
2394 !irq_settings_is_per_cpu_devid(desc))
2397 if (flags && flags != IRQF_TIMER)
2400 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2404 action->handler = handler;
2405 action->flags = flags | IRQF_PERCPU | IRQF_NO_SUSPEND;
2406 action->name = devname;
2407 action->percpu_dev_id = dev_id;
2409 retval = irq_chip_pm_get(&desc->irq_data);
2415 retval = __setup_irq(irq, desc, action);
2418 irq_chip_pm_put(&desc->irq_data);
2424 EXPORT_SYMBOL_GPL(__request_percpu_irq);
2427 * request_percpu_nmi - allocate a percpu interrupt line for NMI delivery
2428 * @irq: Interrupt line to allocate
2429 * @handler: Function to be called when the IRQ occurs.
2430 * @name: An ascii name for the claiming device
2431 * @dev_id: A percpu cookie passed back to the handler function
2433 * This call allocates interrupt resources for a per CPU NMI. Per CPU NMIs
2434 * have to be setup on each CPU by calling prepare_percpu_nmi() before
2435 * being enabled on the same CPU by using enable_percpu_nmi().
2437 * Dev_id must be globally unique. It is a per-cpu variable, and
2438 * the handler gets called with the interrupted CPU's instance of
2441 * Interrupt lines requested for NMI delivering should have auto enabling
2444 * If the interrupt line cannot be used to deliver NMIs, function
2445 * will fail returning a negative value.
2447 int request_percpu_nmi(unsigned int irq, irq_handler_t handler,
2448 const char *name, void __percpu *dev_id)
2450 struct irqaction *action;
2451 struct irq_desc *desc;
2452 unsigned long flags;
2458 desc = irq_to_desc(irq);
2460 if (!desc || !irq_settings_can_request(desc) ||
2461 !irq_settings_is_per_cpu_devid(desc) ||
2462 irq_settings_can_autoenable(desc) ||
2463 !irq_supports_nmi(desc))
2466 /* The line cannot already be NMI */
2467 if (desc->istate & IRQS_NMI)
2470 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
2474 action->handler = handler;
2475 action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND | IRQF_NO_THREAD
2477 action->name = name;
2478 action->percpu_dev_id = dev_id;
2480 retval = irq_chip_pm_get(&desc->irq_data);
2484 retval = __setup_irq(irq, desc, action);
2488 raw_spin_lock_irqsave(&desc->lock, flags);
2489 desc->istate |= IRQS_NMI;
2490 raw_spin_unlock_irqrestore(&desc->lock, flags);
2495 irq_chip_pm_put(&desc->irq_data);
2503 * prepare_percpu_nmi - performs CPU local setup for NMI delivery
2504 * @irq: Interrupt line to prepare for NMI delivery
2506 * This call prepares an interrupt line to deliver NMI on the current CPU,
2507 * before that interrupt line gets enabled with enable_percpu_nmi().
2509 * As a CPU local operation, this should be called from non-preemptible
2512 * If the interrupt line cannot be used to deliver NMIs, function
2513 * will fail returning a negative value.
2515 int prepare_percpu_nmi(unsigned int irq)
2517 unsigned long flags;
2518 struct irq_desc *desc;
2521 WARN_ON(preemptible());
2523 desc = irq_get_desc_lock(irq, &flags,
2524 IRQ_GET_DESC_CHECK_PERCPU);
2528 if (WARN(!(desc->istate & IRQS_NMI),
2529 KERN_ERR "prepare_percpu_nmi called for a non-NMI interrupt: irq %u\n",
2535 ret = irq_nmi_setup(desc);
2537 pr_err("Failed to setup NMI delivery: irq %u\n", irq);
2542 irq_put_desc_unlock(desc, flags);
2547 * teardown_percpu_nmi - undoes NMI setup of IRQ line
2548 * @irq: Interrupt line from which CPU local NMI configuration should be
2551 * This call undoes the setup done by prepare_percpu_nmi().
2553 * IRQ line should not be enabled for the current CPU.
2555 * As a CPU local operation, this should be called from non-preemptible
2558 void teardown_percpu_nmi(unsigned int irq)
2560 unsigned long flags;
2561 struct irq_desc *desc;
2563 WARN_ON(preemptible());
2565 desc = irq_get_desc_lock(irq, &flags,
2566 IRQ_GET_DESC_CHECK_PERCPU);
2570 if (WARN_ON(!(desc->istate & IRQS_NMI)))
2573 irq_nmi_teardown(desc);
2575 irq_put_desc_unlock(desc, flags);
2579 * irq_get_irqchip_state - returns the irqchip state of a interrupt.
2580 * @irq: Interrupt line that is forwarded to a VM
2581 * @which: One of IRQCHIP_STATE_* the caller wants to know about
2582 * @state: a pointer to a boolean where the state is to be storeed
2584 * This call snapshots the internal irqchip state of an
2585 * interrupt, returning into @state the bit corresponding to
2588 * This function should be called with preemption disabled if the
2589 * interrupt controller has per-cpu registers.
2591 int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
2594 struct irq_desc *desc;
2595 struct irq_data *data;
2596 struct irq_chip *chip;
2597 unsigned long flags;
2600 desc = irq_get_desc_buslock(irq, &flags, 0);
2604 data = irq_desc_get_irq_data(desc);
2607 chip = irq_data_get_irq_chip(data);
2608 if (chip->irq_get_irqchip_state)
2610 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2611 data = data->parent_data;
2618 err = chip->irq_get_irqchip_state(data, which, state);
2620 irq_put_desc_busunlock(desc, flags);
2623 EXPORT_SYMBOL_GPL(irq_get_irqchip_state);
2626 * irq_set_irqchip_state - set the state of a forwarded interrupt.
2627 * @irq: Interrupt line that is forwarded to a VM
2628 * @which: State to be restored (one of IRQCHIP_STATE_*)
2629 * @val: Value corresponding to @which
2631 * This call sets the internal irqchip state of an interrupt,
2632 * depending on the value of @which.
2634 * This function should be called with preemption disabled if the
2635 * interrupt controller has per-cpu registers.
2637 int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
2640 struct irq_desc *desc;
2641 struct irq_data *data;
2642 struct irq_chip *chip;
2643 unsigned long flags;
2646 desc = irq_get_desc_buslock(irq, &flags, 0);
2650 data = irq_desc_get_irq_data(desc);
2653 chip = irq_data_get_irq_chip(data);
2654 if (chip->irq_set_irqchip_state)
2656 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2657 data = data->parent_data;
2664 err = chip->irq_set_irqchip_state(data, which, val);
2666 irq_put_desc_busunlock(desc, flags);
2669 EXPORT_SYMBOL_GPL(irq_set_irqchip_state);