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
);