1 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef _LINUX_INTERRUPT_H
4 #define _LINUX_INTERRUPT_H
6 #include <linux/kernel.h>
7 #include <linux/bitops.h>
8 #include <linux/cpumask.h>
9 #include <linux/irqreturn.h>
10 #include <linux/irqnr.h>
11 #include <linux/hardirq.h>
12 #include <linux/irqflags.h>
13 #include <linux/hrtimer.h>
14 #include <linux/kref.h>
15 #include <linux/workqueue.h>
17 #include <linux/atomic.h>
18 #include <asm/ptrace.h>
20 #include <asm/sections.h>
23 * These correspond to the IORESOURCE_IRQ_* defines in
24 * linux/ioport.h to select the interrupt line behaviour. When
25 * requesting an interrupt without specifying a IRQF_TRIGGER, the
26 * setting should be assumed to be "as already configured", which
27 * may be as per machine or firmware initialisation.
29 #define IRQF_TRIGGER_NONE 0x00000000
30 #define IRQF_TRIGGER_RISING 0x00000001
31 #define IRQF_TRIGGER_FALLING 0x00000002
32 #define IRQF_TRIGGER_HIGH 0x00000004
33 #define IRQF_TRIGGER_LOW 0x00000008
34 #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
35 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
36 #define IRQF_TRIGGER_PROBE 0x00000010
39 * These flags used only by the kernel as part of the
40 * irq handling routines.
42 * IRQF_SHARED - allow sharing the irq among several devices
43 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
44 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
45 * IRQF_PERCPU - Interrupt is per cpu
46 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
47 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
48 * registered first in a shared interrupt is considered for
49 * performance reasons)
50 * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
51 * Used by threaded interrupts which need to keep the
52 * irq line disabled until the threaded handler has been run.
53 * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend. Does not guarantee
54 * that this interrupt will wake the system from a suspended
55 * state. See Documentation/power/suspend-and-interrupts.rst
56 * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
57 * IRQF_NO_THREAD - Interrupt cannot be threaded
58 * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
60 * IRQF_COND_SUSPEND - If the IRQ is shared with a NO_SUSPEND user, execute this
61 * interrupt handler after suspending interrupts. For system
62 * wakeup devices users need to implement wakeup detection in
63 * their interrupt handlers.
64 * IRQF_NO_AUTOEN - Don't enable IRQ or NMI automatically when users request it.
65 * Users will enable it explicitly by enable_irq() or enable_nmi()
68 #define IRQF_SHARED 0x00000080
69 #define IRQF_PROBE_SHARED 0x00000100
70 #define __IRQF_TIMER 0x00000200
71 #define IRQF_PERCPU 0x00000400
72 #define IRQF_NOBALANCING 0x00000800
73 #define IRQF_IRQPOLL 0x00001000
74 #define IRQF_ONESHOT 0x00002000
75 #define IRQF_NO_SUSPEND 0x00004000
76 #define IRQF_FORCE_RESUME 0x00008000
77 #define IRQF_NO_THREAD 0x00010000
78 #define IRQF_EARLY_RESUME 0x00020000
79 #define IRQF_COND_SUSPEND 0x00040000
80 #define IRQF_NO_AUTOEN 0x00080000
82 #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
85 * These values can be returned by request_any_context_irq() and
86 * describe the context the interrupt will be run in.
88 * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
89 * IRQC_IS_NESTED - interrupt runs in a nested threaded context
96 typedef irqreturn_t (*irq_handler_t)(int, void *);
99 * struct irqaction - per interrupt action descriptor
100 * @handler: interrupt handler function
101 * @name: name of the device
102 * @dev_id: cookie to identify the device
103 * @percpu_dev_id: cookie to identify the device
104 * @next: pointer to the next irqaction for shared interrupts
105 * @irq: interrupt number
106 * @flags: flags (see IRQF_* above)
107 * @thread_fn: interrupt handler function for threaded interrupts
108 * @thread: thread pointer for threaded interrupts
109 * @secondary: pointer to secondary irqaction (force threading)
110 * @thread_flags: flags related to @thread
111 * @thread_mask: bitmask for keeping track of @thread activity
112 * @dir: pointer to the proc/irq/NN/name entry
115 irq_handler_t handler;
117 void __percpu *percpu_dev_id;
118 struct irqaction *next;
119 irq_handler_t thread_fn;
120 struct task_struct *thread;
121 struct irqaction *secondary;
124 unsigned long thread_flags;
125 unsigned long thread_mask;
127 struct proc_dir_entry *dir;
128 } ____cacheline_internodealigned_in_smp;
130 extern irqreturn_t no_action(int cpl, void *dev_id);
133 * If a (PCI) device interrupt is not connected we set dev->irq to
134 * IRQ_NOTCONNECTED. This causes request_irq() to fail with -ENOTCONN, so we
135 * can distingiush that case from other error returns.
137 * 0x80000000 is guaranteed to be outside the available range of interrupts
138 * and easy to distinguish from other possible incorrect values.
140 #define IRQ_NOTCONNECTED (1U << 31)
142 extern int __must_check
143 request_threaded_irq(unsigned int irq, irq_handler_t handler,
144 irq_handler_t thread_fn,
145 unsigned long flags, const char *name, void *dev);
148 * request_irq - Add a handler for an interrupt line
149 * @irq: The interrupt line to allocate
150 * @handler: Function to be called when the IRQ occurs.
151 * Primary handler for threaded interrupts
152 * If NULL, the default primary handler is installed
153 * @flags: Handling flags
154 * @name: Name of the device generating this interrupt
155 * @dev: A cookie passed to the handler function
157 * This call allocates an interrupt and establishes a handler; see
158 * the documentation for request_threaded_irq() for details.
160 static inline int __must_check
161 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
162 const char *name, void *dev)
164 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
167 extern int __must_check
168 request_any_context_irq(unsigned int irq, irq_handler_t handler,
169 unsigned long flags, const char *name, void *dev_id);
171 extern int __must_check
172 __request_percpu_irq(unsigned int irq, irq_handler_t handler,
173 unsigned long flags, const char *devname,
174 void __percpu *percpu_dev_id);
176 extern int __must_check
177 request_nmi(unsigned int irq, irq_handler_t handler, unsigned long flags,
178 const char *name, void *dev);
180 static inline int __must_check
181 request_percpu_irq(unsigned int irq, irq_handler_t handler,
182 const char *devname, void __percpu *percpu_dev_id)
184 return __request_percpu_irq(irq, handler, 0,
185 devname, percpu_dev_id);
188 extern int __must_check
189 request_percpu_nmi(unsigned int irq, irq_handler_t handler,
190 const char *devname, void __percpu *dev);
192 extern const void *free_irq(unsigned int, void *);
193 extern void free_percpu_irq(unsigned int, void __percpu *);
195 extern const void *free_nmi(unsigned int irq, void *dev_id);
196 extern void free_percpu_nmi(unsigned int irq, void __percpu *percpu_dev_id);
200 extern int __must_check
201 devm_request_threaded_irq(struct device *dev, unsigned int irq,
202 irq_handler_t handler, irq_handler_t thread_fn,
203 unsigned long irqflags, const char *devname,
206 static inline int __must_check
207 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
208 unsigned long irqflags, const char *devname, void *dev_id)
210 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
214 extern int __must_check
215 devm_request_any_context_irq(struct device *dev, unsigned int irq,
216 irq_handler_t handler, unsigned long irqflags,
217 const char *devname, void *dev_id);
219 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
222 * On lockdep we dont want to enable hardirqs in hardirq
223 * context. Use local_irq_enable_in_hardirq() to annotate
224 * kernel code that has to do this nevertheless (pretty much
225 * the only valid case is for old/broken hardware that is
228 * NOTE: in theory this might break fragile code that relies
229 * on hardirq delivery - in practice we dont seem to have such
230 * places left. So the only effect should be slightly increased
231 * irqs-off latencies.
233 #ifdef CONFIG_LOCKDEP
234 # define local_irq_enable_in_hardirq() do { } while (0)
236 # define local_irq_enable_in_hardirq() local_irq_enable()
239 bool irq_has_action(unsigned int irq);
240 extern void disable_irq_nosync(unsigned int irq);
241 extern bool disable_hardirq(unsigned int irq);
242 extern void disable_irq(unsigned int irq);
243 extern void disable_percpu_irq(unsigned int irq);
244 extern void enable_irq(unsigned int irq);
245 extern void enable_percpu_irq(unsigned int irq, unsigned int type);
246 extern bool irq_percpu_is_enabled(unsigned int irq);
247 extern void irq_wake_thread(unsigned int irq, void *dev_id);
249 extern void disable_nmi_nosync(unsigned int irq);
250 extern void disable_percpu_nmi(unsigned int irq);
251 extern void enable_nmi(unsigned int irq);
252 extern void enable_percpu_nmi(unsigned int irq, unsigned int type);
253 extern int prepare_percpu_nmi(unsigned int irq);
254 extern void teardown_percpu_nmi(unsigned int irq);
256 extern int irq_inject_interrupt(unsigned int irq);
258 /* The following three functions are for the core kernel use only. */
259 extern void suspend_device_irqs(void);
260 extern void resume_device_irqs(void);
261 extern void rearm_wake_irq(unsigned int irq);
264 * struct irq_affinity_notify - context for notification of IRQ affinity changes
265 * @irq: Interrupt to which notification applies
266 * @kref: Reference count, for internal use
267 * @work: Work item, for internal use
268 * @notify: Function to be called on change. This will be
269 * called in process context.
270 * @release: Function to be called on release. This will be
271 * called in process context. Once registered, the
272 * structure must only be freed when this function is
275 struct irq_affinity_notify {
278 struct work_struct work;
279 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
280 void (*release)(struct kref *ref);
283 #define IRQ_AFFINITY_MAX_SETS 4
286 * struct irq_affinity - Description for automatic irq affinity assignements
287 * @pre_vectors: Don't apply affinity to @pre_vectors at beginning of
288 * the MSI(-X) vector space
289 * @post_vectors: Don't apply affinity to @post_vectors at end of
290 * the MSI(-X) vector space
291 * @nr_sets: The number of interrupt sets for which affinity
292 * spreading is required
293 * @set_size: Array holding the size of each interrupt set
294 * @calc_sets: Callback for calculating the number and size
296 * @priv: Private data for usage by @calc_sets, usually a
297 * pointer to driver/device specific data.
299 struct irq_affinity {
300 unsigned int pre_vectors;
301 unsigned int post_vectors;
302 unsigned int nr_sets;
303 unsigned int set_size[IRQ_AFFINITY_MAX_SETS];
304 void (*calc_sets)(struct irq_affinity *, unsigned int nvecs);
309 * struct irq_affinity_desc - Interrupt affinity descriptor
310 * @mask: cpumask to hold the affinity assignment
311 * @is_managed: 1 if the interrupt is managed internally
313 struct irq_affinity_desc {
315 unsigned int is_managed : 1;
318 #if defined(CONFIG_SMP)
320 extern cpumask_var_t irq_default_affinity;
322 /* Internal implementation. Use the helpers below */
323 extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
327 * irq_set_affinity - Set the irq affinity of a given irq
328 * @irq: Interrupt to set affinity
331 * Fails if cpumask does not contain an online CPU
334 irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
336 return __irq_set_affinity(irq, cpumask, false);
340 * irq_force_affinity - Force the irq affinity of a given irq
341 * @irq: Interrupt to set affinity
344 * Same as irq_set_affinity, but without checking the mask against
347 * Solely for low level cpu hotplug code, where we need to make per
348 * cpu interrupts affine before the cpu becomes online.
351 irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
353 return __irq_set_affinity(irq, cpumask, true);
356 extern int irq_can_set_affinity(unsigned int irq);
357 extern int irq_select_affinity(unsigned int irq);
359 extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
360 extern int irq_update_affinity_desc(unsigned int irq,
361 struct irq_affinity_desc *affinity);
364 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
366 struct irq_affinity_desc *
367 irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd);
369 unsigned int irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec,
370 const struct irq_affinity *affd);
372 #else /* CONFIG_SMP */
374 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
379 static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
384 static inline int irq_can_set_affinity(unsigned int irq)
389 static inline int irq_select_affinity(unsigned int irq) { return 0; }
391 static inline int irq_set_affinity_hint(unsigned int irq,
392 const struct cpumask *m)
397 static inline int irq_update_affinity_desc(unsigned int irq,
398 struct irq_affinity_desc *affinity)
404 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
409 static inline struct irq_affinity_desc *
410 irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd)
415 static inline unsigned int
416 irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec,
417 const struct irq_affinity *affd)
422 #endif /* CONFIG_SMP */
425 * Special lockdep variants of irq disabling/enabling.
426 * These should be used for locking constructs that
427 * know that a particular irq context which is disabled,
428 * and which is the only irq-context user of a lock,
429 * that it's safe to take the lock in the irq-disabled
430 * section without disabling hardirqs.
432 * On !CONFIG_LOCKDEP they are equivalent to the normal
433 * irq disable/enable methods.
435 static inline void disable_irq_nosync_lockdep(unsigned int irq)
437 disable_irq_nosync(irq);
438 #ifdef CONFIG_LOCKDEP
443 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
445 disable_irq_nosync(irq);
446 #ifdef CONFIG_LOCKDEP
447 local_irq_save(*flags);
451 static inline void disable_irq_lockdep(unsigned int irq)
454 #ifdef CONFIG_LOCKDEP
459 static inline void enable_irq_lockdep(unsigned int irq)
461 #ifdef CONFIG_LOCKDEP
467 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
469 #ifdef CONFIG_LOCKDEP
470 local_irq_restore(*flags);
475 /* IRQ wakeup (PM) control: */
476 extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
478 static inline int enable_irq_wake(unsigned int irq)
480 return irq_set_irq_wake(irq, 1);
483 static inline int disable_irq_wake(unsigned int irq)
485 return irq_set_irq_wake(irq, 0);
489 * irq_get_irqchip_state/irq_set_irqchip_state specific flags
491 enum irqchip_irq_state {
492 IRQCHIP_STATE_PENDING, /* Is interrupt pending? */
493 IRQCHIP_STATE_ACTIVE, /* Is interrupt in progress? */
494 IRQCHIP_STATE_MASKED, /* Is interrupt masked? */
495 IRQCHIP_STATE_LINE_LEVEL, /* Is IRQ line high? */
498 extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
500 extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
503 #ifdef CONFIG_IRQ_FORCED_THREADING
504 # ifdef CONFIG_PREEMPT_RT
505 # define force_irqthreads (true)
507 extern bool force_irqthreads;
510 #define force_irqthreads (0)
513 #ifndef local_softirq_pending
515 #ifndef local_softirq_pending_ref
516 #define local_softirq_pending_ref irq_stat.__softirq_pending
519 #define local_softirq_pending() (__this_cpu_read(local_softirq_pending_ref))
520 #define set_softirq_pending(x) (__this_cpu_write(local_softirq_pending_ref, (x)))
521 #define or_softirq_pending(x) (__this_cpu_or(local_softirq_pending_ref, (x)))
523 #endif /* local_softirq_pending */
525 /* Some architectures might implement lazy enabling/disabling of
526 * interrupts. In some cases, such as stop_machine, we might want
527 * to ensure that after a local_irq_disable(), interrupts have
528 * really been disabled in hardware. Such architectures need to
529 * implement the following hook.
531 #ifndef hard_irq_disable
532 #define hard_irq_disable() do { } while(0)
535 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
536 frequency threaded job scheduling. For almost all the purposes
537 tasklets are more than enough. F.e. all serial device BHs et
538 al. should be converted to tasklets, not to softirqs.
552 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
557 #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
559 /* map softirq index to softirq name. update 'softirq_to_name' in
560 * kernel/softirq.c when adding a new softirq.
562 extern const char * const softirq_to_name[NR_SOFTIRQS];
564 /* softirq mask and active fields moved to irq_cpustat_t in
565 * asm/hardirq.h to get better cache usage. KAO
568 struct softirq_action
570 void (*action)(struct softirq_action *);
573 asmlinkage void do_softirq(void);
574 asmlinkage void __do_softirq(void);
576 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
577 extern void softirq_init(void);
578 extern void __raise_softirq_irqoff(unsigned int nr);
580 extern void raise_softirq_irqoff(unsigned int nr);
581 extern void raise_softirq(unsigned int nr);
583 DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
585 static inline struct task_struct *this_cpu_ksoftirqd(void)
587 return this_cpu_read(ksoftirqd);
590 /* Tasklets --- multithreaded analogue of BHs.
592 This API is deprecated. Please consider using threaded IRQs instead:
593 https://lore.kernel.org/lkml/20200716081538.2sivhkj4hcyrusem@linutronix.de
595 Main feature differing them of generic softirqs: tasklet
596 is running only on one CPU simultaneously.
598 Main feature differing them of BHs: different tasklets
599 may be run simultaneously on different CPUs.
602 * If tasklet_schedule() is called, then tasklet is guaranteed
603 to be executed on some cpu at least once after this.
604 * If the tasklet is already scheduled, but its execution is still not
605 started, it will be executed only once.
606 * If this tasklet is already running on another CPU (or schedule is called
607 from tasklet itself), it is rescheduled for later.
608 * Tasklet is strictly serialized wrt itself, but not
609 wrt another tasklets. If client needs some intertask synchronization,
610 he makes it with spinlocks.
613 struct tasklet_struct
615 struct tasklet_struct *next;
620 void (*func)(unsigned long data);
621 void (*callback)(struct tasklet_struct *t);
626 #define DECLARE_TASKLET(name, _callback) \
627 struct tasklet_struct name = { \
628 .count = ATOMIC_INIT(0), \
629 .callback = _callback, \
630 .use_callback = true, \
633 #define DECLARE_TASKLET_DISABLED(name, _callback) \
634 struct tasklet_struct name = { \
635 .count = ATOMIC_INIT(1), \
636 .callback = _callback, \
637 .use_callback = true, \
640 #define from_tasklet(var, callback_tasklet, tasklet_fieldname) \
641 container_of(callback_tasklet, typeof(*var), tasklet_fieldname)
643 #define DECLARE_TASKLET_OLD(name, _func) \
644 struct tasklet_struct name = { \
645 .count = ATOMIC_INIT(0), \
649 #define DECLARE_TASKLET_DISABLED_OLD(name, _func) \
650 struct tasklet_struct name = { \
651 .count = ATOMIC_INIT(1), \
657 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
658 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
661 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT)
662 static inline int tasklet_trylock(struct tasklet_struct *t)
664 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
667 void tasklet_unlock(struct tasklet_struct *t);
668 void tasklet_unlock_wait(struct tasklet_struct *t);
669 void tasklet_unlock_spin_wait(struct tasklet_struct *t);
672 static inline int tasklet_trylock(struct tasklet_struct *t) { return 1; }
673 static inline void tasklet_unlock(struct tasklet_struct *t) { }
674 static inline void tasklet_unlock_wait(struct tasklet_struct *t) { }
675 static inline void tasklet_unlock_spin_wait(struct tasklet_struct *t) { }
678 extern void __tasklet_schedule(struct tasklet_struct *t);
680 static inline void tasklet_schedule(struct tasklet_struct *t)
682 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
683 __tasklet_schedule(t);
686 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
688 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
690 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
691 __tasklet_hi_schedule(t);
694 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
696 atomic_inc(&t->count);
697 smp_mb__after_atomic();
701 * Do not use in new code. Disabling tasklets from atomic contexts is
702 * error prone and should be avoided.
704 static inline void tasklet_disable_in_atomic(struct tasklet_struct *t)
706 tasklet_disable_nosync(t);
707 tasklet_unlock_spin_wait(t);
711 static inline void tasklet_disable(struct tasklet_struct *t)
713 tasklet_disable_nosync(t);
714 tasklet_unlock_wait(t);
718 static inline void tasklet_enable(struct tasklet_struct *t)
720 smp_mb__before_atomic();
721 atomic_dec(&t->count);
724 extern void tasklet_kill(struct tasklet_struct *t);
725 extern void tasklet_init(struct tasklet_struct *t,
726 void (*func)(unsigned long), unsigned long data);
727 extern void tasklet_setup(struct tasklet_struct *t,
728 void (*callback)(struct tasklet_struct *));
731 * Autoprobing for irqs:
733 * probe_irq_on() and probe_irq_off() provide robust primitives
734 * for accurate IRQ probing during kernel initialization. They are
735 * reasonably simple to use, are not "fooled" by spurious interrupts,
736 * and, unlike other attempts at IRQ probing, they do not get hung on
737 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
739 * For reasonably foolproof probing, use them as follows:
741 * 1. clear and/or mask the device's internal interrupt.
743 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
744 * 4. enable the device and cause it to trigger an interrupt.
745 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
746 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
747 * 7. service the device to clear its pending interrupt.
748 * 8. loop again if paranoia is required.
750 * probe_irq_on() returns a mask of allocated irq's.
752 * probe_irq_off() takes the mask as a parameter,
753 * and returns the irq number which occurred,
754 * or zero if none occurred, or a negative irq number
755 * if more than one irq occurred.
758 #if !defined(CONFIG_GENERIC_IRQ_PROBE)
759 static inline unsigned long probe_irq_on(void)
763 static inline int probe_irq_off(unsigned long val)
767 static inline unsigned int probe_irq_mask(unsigned long val)
772 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
773 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
774 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
777 #ifdef CONFIG_PROC_FS
778 /* Initialize /proc/irq/ */
779 extern void init_irq_proc(void);
781 static inline void init_irq_proc(void)
786 #ifdef CONFIG_IRQ_TIMINGS
787 void irq_timings_enable(void);
788 void irq_timings_disable(void);
789 u64 irq_timings_next_event(u64 now);
793 int show_interrupts(struct seq_file *p, void *v);
794 int arch_show_interrupts(struct seq_file *p, int prec);
796 extern int early_irq_init(void);
797 extern int arch_probe_nr_irqs(void);
798 extern int arch_early_irq_init(void);
801 * We want to know which function is an entrypoint of a hardirq or a softirq.
804 # define __irq_entry __section(".irqentry.text")
807 #define __softirq_entry __section(".softirqentry.text")