1/* SPDX-License-Identifier: GPL-2.0 */
2/* interrupt.h */
3#ifndef _LINUX_INTERRUPT_H
4#define _LINUX_INTERRUPT_H
5
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>
16
17#include <linux/atomic.h>
18#include <asm/ptrace.h>
19#include <asm/irq.h>
20#include <asm/sections.h>
21
22/*
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.
28 */
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
37
38/*
39 * These flags used only by the kernel as part of the
40 * irq handling routines.
41 *
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 an 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.txt
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
59 * resume time.
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 */
65#define IRQF_SHARED 0x00000080
66#define IRQF_PROBE_SHARED 0x00000100
67#define __IRQF_TIMER 0x00000200
68#define IRQF_PERCPU 0x00000400
69#define IRQF_NOBALANCING 0x00000800
70#define IRQF_IRQPOLL 0x00001000
71#define IRQF_ONESHOT 0x00002000
72#define IRQF_NO_SUSPEND 0x00004000
73#define IRQF_FORCE_RESUME 0x00008000
74#define IRQF_NO_THREAD 0x00010000
75#define IRQF_EARLY_RESUME 0x00020000
76#define IRQF_COND_SUSPEND 0x00040000
77
78#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
79
80/*
81 * These values can be returned by request_any_context_irq() and
82 * describe the context the interrupt will be run in.
83 *
84 * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
85 * IRQC_IS_NESTED - interrupt runs in a nested threaded context
86 */
87enum {
88 IRQC_IS_HARDIRQ = 0,
89 IRQC_IS_NESTED,
90};
91
92typedef irqreturn_t (*irq_handler_t)(int, void *);
93
94/**
95 * struct irqaction - per interrupt action descriptor
96 * @handler: interrupt handler function
97 * @name: name of the device
98 * @dev_id: cookie to identify the device
99 * @percpu_dev_id: cookie to identify the device
100 * @next: pointer to the next irqaction for shared interrupts
101 * @irq: interrupt number
102 * @flags: flags (see IRQF_* above)
103 * @thread_fn: interrupt handler function for threaded interrupts
104 * @thread: thread pointer for threaded interrupts
105 * @secondary: pointer to secondary irqaction (force threading)
106 * @thread_flags: flags related to @thread
107 * @thread_mask: bitmask for keeping track of @thread activity
108 * @dir: pointer to the proc/irq/NN/name entry
109 */
110struct irqaction {
111 irq_handler_t handler;
112 void *dev_id;
113 void __percpu *percpu_dev_id;
114 struct irqaction *next;
115 irq_handler_t thread_fn;
116 struct task_struct *thread;
117 struct irqaction *secondary;
118 unsigned int irq;
119 unsigned int flags;
120 unsigned long thread_flags;
121 unsigned long thread_mask;
122 const char *name;
123 struct proc_dir_entry *dir;
124} ____cacheline_internodealigned_in_smp;
125
126extern irqreturn_t no_action(int cpl, void *dev_id);
127
128/*
129 * If a (PCI) device interrupt is not connected we set dev->irq to
130 * IRQ_NOTCONNECTED. This causes request_irq() to fail with -ENOTCONN, so we
131 * can distingiush that case from other error returns.
132 *
133 * 0x80000000 is guaranteed to be outside the available range of interrupts
134 * and easy to distinguish from other possible incorrect values.
135 */
136#define IRQ_NOTCONNECTED (1U << 31)
137
138extern int __must_check
139request_threaded_irq(unsigned int irq, irq_handler_t handler,
140 irq_handler_t thread_fn,
141 unsigned long flags, const char *name, void *dev);
142
143static inline int __must_check
144request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
145 const char *name, void *dev)
146{
147 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
148}
149
150extern int __must_check
151request_any_context_irq(unsigned int irq, irq_handler_t handler,
152 unsigned long flags, const char *name, void *dev_id);
153
154extern int __must_check
155__request_percpu_irq(unsigned int irq, irq_handler_t handler,
156 unsigned long flags, const char *devname,
157 void __percpu *percpu_dev_id);
158
159static inline int __must_check
160request_percpu_irq(unsigned int irq, irq_handler_t handler,
161 const char *devname, void __percpu *percpu_dev_id)
162{
163 return __request_percpu_irq(irq, handler, 0,
164 devname, percpu_dev_id);
165}
166
167extern const void *free_irq(unsigned int, void *);
168extern void free_percpu_irq(unsigned int, void __percpu *);
169
170struct device;
171
172extern int __must_check
173devm_request_threaded_irq(struct device *dev, unsigned int irq,
174 irq_handler_t handler, irq_handler_t thread_fn,
175 unsigned long irqflags, const char *devname,
176 void *dev_id);
177
178static inline int __must_check
179devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
180 unsigned long irqflags, const char *devname, void *dev_id)
181{
182 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
183 devname, dev_id);
184}
185
186extern int __must_check
187devm_request_any_context_irq(struct device *dev, unsigned int irq,
188 irq_handler_t handler, unsigned long irqflags,
189 const char *devname, void *dev_id);
190
191extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
192
193/*
194 * On lockdep we dont want to enable hardirqs in hardirq
195 * context. Use local_irq_enable_in_hardirq() to annotate
196 * kernel code that has to do this nevertheless (pretty much
197 * the only valid case is for old/broken hardware that is
198 * insanely slow).
199 *
200 * NOTE: in theory this might break fragile code that relies
201 * on hardirq delivery - in practice we dont seem to have such
202 * places left. So the only effect should be slightly increased
203 * irqs-off latencies.
204 */
205#ifdef CONFIG_LOCKDEP
206# define local_irq_enable_in_hardirq() do { } while (0)
207#else
208# define local_irq_enable_in_hardirq() local_irq_enable()
209#endif
210
211extern void disable_irq_nosync(unsigned int irq);
212extern bool disable_hardirq(unsigned int irq);
213extern void disable_irq(unsigned int irq);
214extern void disable_percpu_irq(unsigned int irq);
215extern void enable_irq(unsigned int irq);
216extern void enable_percpu_irq(unsigned int irq, unsigned int type);
217extern bool irq_percpu_is_enabled(unsigned int irq);
218extern void irq_wake_thread(unsigned int irq, void *dev_id);
219
220/* The following three functions are for the core kernel use only. */
221extern void suspend_device_irqs(void);
222extern void resume_device_irqs(void);
223
224/**
225 * struct irq_affinity_notify - context for notification of IRQ affinity changes
226 * @irq: Interrupt to which notification applies
227 * @kref: Reference count, for internal use
228 * @work: Work item, for internal use
229 * @notify: Function to be called on change. This will be
230 * called in process context.
231 * @release: Function to be called on release. This will be
232 * called in process context. Once registered, the
233 * structure must only be freed when this function is
234 * called or later.
235 */
236struct irq_affinity_notify {
237 unsigned int irq;
238 struct kref kref;
239 struct work_struct work;
240 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
241 void (*release)(struct kref *ref);
242};
243
244/**
245 * struct irq_affinity - Description for automatic irq affinity assignements
246 * @pre_vectors: Don't apply affinity to @pre_vectors at beginning of
247 * the MSI(-X) vector space
248 * @post_vectors: Don't apply affinity to @post_vectors at end of
249 * the MSI(-X) vector space
250 */
251struct irq_affinity {
252 int pre_vectors;
253 int post_vectors;
254};
255
256#if defined(CONFIG_SMP)
257
258extern cpumask_var_t irq_default_affinity;
259
260/* Internal implementation. Use the helpers below */
261extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
262 bool force);
263
264/**
265 * irq_set_affinity - Set the irq affinity of a given irq
266 * @irq: Interrupt to set affinity
267 * @cpumask: cpumask
268 *
269 * Fails if cpumask does not contain an online CPU
270 */
271static inline int
272irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
273{
274 return __irq_set_affinity(irq, cpumask, false);
275}
276
277/**
278 * irq_force_affinity - Force the irq affinity of a given irq
279 * @irq: Interrupt to set affinity
280 * @cpumask: cpumask
281 *
282 * Same as irq_set_affinity, but without checking the mask against
283 * online cpus.
284 *
285 * Solely for low level cpu hotplug code, where we need to make per
286 * cpu interrupts affine before the cpu becomes online.
287 */
288static inline int
289irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
290{
291 return __irq_set_affinity(irq, cpumask, true);
292}
293
294extern int irq_can_set_affinity(unsigned int irq);
295extern int irq_select_affinity(unsigned int irq);
296
297extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
298
299extern int
300irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
301
302struct cpumask *irq_create_affinity_masks(int nvec, const struct irq_affinity *affd);
303int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd);
304
305#else /* CONFIG_SMP */
306
307static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
308{
309 return -EINVAL;
310}
311
312static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
313{
314 return 0;
315}
316
317static inline int irq_can_set_affinity(unsigned int irq)
318{
319 return 0;
320}
321
322static inline int irq_select_affinity(unsigned int irq) { return 0; }
323
324static inline int irq_set_affinity_hint(unsigned int irq,
325 const struct cpumask *m)
326{
327 return -EINVAL;
328}
329
330static inline int
331irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
332{
333 return 0;
334}
335
336static inline struct cpumask *
337irq_create_affinity_masks(int nvec, const struct irq_affinity *affd)
338{
339 return NULL;
340}
341
342static inline int
343irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd)
344{
345 return maxvec;
346}
347
348#endif /* CONFIG_SMP */
349
350/*
351 * Special lockdep variants of irq disabling/enabling.
352 * These should be used for locking constructs that
353 * know that a particular irq context which is disabled,
354 * and which is the only irq-context user of a lock,
355 * that it's safe to take the lock in the irq-disabled
356 * section without disabling hardirqs.
357 *
358 * On !CONFIG_LOCKDEP they are equivalent to the normal
359 * irq disable/enable methods.
360 */
361static inline void disable_irq_nosync_lockdep(unsigned int irq)
362{
363 disable_irq_nosync(irq);
364#ifdef CONFIG_LOCKDEP
365 local_irq_disable();
366#endif
367}
368
369static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
370{
371 disable_irq_nosync(irq);
372#ifdef CONFIG_LOCKDEP
373 local_irq_save(*flags);
374#endif
375}
376
377static inline void disable_irq_lockdep(unsigned int irq)
378{
379 disable_irq(irq);
380#ifdef CONFIG_LOCKDEP
381 local_irq_disable();
382#endif
383}
384
385static inline void enable_irq_lockdep(unsigned int irq)
386{
387#ifdef CONFIG_LOCKDEP
388 local_irq_enable();
389#endif
390 enable_irq(irq);
391}
392
393static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
394{
395#ifdef CONFIG_LOCKDEP
396 local_irq_restore(*flags);
397#endif
398 enable_irq(irq);
399}
400
401/* IRQ wakeup (PM) control: */
402extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
403
404static inline int enable_irq_wake(unsigned int irq)
405{
406 return irq_set_irq_wake(irq, 1);
407}
408
409static inline int disable_irq_wake(unsigned int irq)
410{
411 return irq_set_irq_wake(irq, 0);
412}
413
414/*
415 * irq_get_irqchip_state/irq_set_irqchip_state specific flags
416 */
417enum irqchip_irq_state {
418 IRQCHIP_STATE_PENDING, /* Is interrupt pending? */
419 IRQCHIP_STATE_ACTIVE, /* Is interrupt in progress? */
420 IRQCHIP_STATE_MASKED, /* Is interrupt masked? */
421 IRQCHIP_STATE_LINE_LEVEL, /* Is IRQ line high? */
422};
423
424extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
425 bool *state);
426extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
427 bool state);
428
429#ifdef CONFIG_IRQ_FORCED_THREADING
430extern bool force_irqthreads;
431#else
432#define force_irqthreads (0)
433#endif
434
435#ifndef local_softirq_pending
436
437#ifndef local_softirq_pending_ref
438#define local_softirq_pending_ref irq_stat.__softirq_pending
439#endif
440
441#define local_softirq_pending() (__this_cpu_read(local_softirq_pending_ref))
442#define set_softirq_pending(x) (__this_cpu_write(local_softirq_pending_ref, (x)))
443#define or_softirq_pending(x) (__this_cpu_or(local_softirq_pending_ref, (x)))
444
445#endif /* local_softirq_pending */
446
447/* Some architectures might implement lazy enabling/disabling of
448 * interrupts. In some cases, such as stop_machine, we might want
449 * to ensure that after a local_irq_disable(), interrupts have
450 * really been disabled in hardware. Such architectures need to
451 * implement the following hook.
452 */
453#ifndef hard_irq_disable
454#define hard_irq_disable() do { } while(0)
455#endif
456
457/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
458 frequency threaded job scheduling. For almost all the purposes
459 tasklets are more than enough. F.e. all serial device BHs et
460 al. should be converted to tasklets, not to softirqs.
461 */
462
463enum
464{
465 HI_SOFTIRQ=0,
466 TIMER_SOFTIRQ,
467 NET_TX_SOFTIRQ,
468 NET_RX_SOFTIRQ,
469 BLOCK_SOFTIRQ,
470 IRQ_POLL_SOFTIRQ,
471 TASKLET_SOFTIRQ,
472 SCHED_SOFTIRQ,
473 HRTIMER_SOFTIRQ, /* Unused, but kept as tools rely on the
474 numbering. Sigh! */
475 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
476
477 NR_SOFTIRQS
478};
479
480#define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
481
482/* map softirq index to softirq name. update 'softirq_to_name' in
483 * kernel/softirq.c when adding a new softirq.
484 */
485extern const char * const softirq_to_name[NR_SOFTIRQS];
486
487/* softirq mask and active fields moved to irq_cpustat_t in
488 * asm/hardirq.h to get better cache usage. KAO
489 */
490
491struct softirq_action
492{
493 void (*action)(struct softirq_action *);
494};
495
496asmlinkage void do_softirq(void);
497asmlinkage void __do_softirq(void);
498
499#ifdef __ARCH_HAS_DO_SOFTIRQ
500void do_softirq_own_stack(void);
501#else
502static inline void do_softirq_own_stack(void)
503{
504 __do_softirq();
505}
506#endif
507
508extern void open_softirq(int nr, void (*action)(struct softirq_action *));
509extern void softirq_init(void);
510extern void __raise_softirq_irqoff(unsigned int nr);
511
512extern void raise_softirq_irqoff(unsigned int nr);
513extern void raise_softirq(unsigned int nr);
514
515DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
516
517static inline struct task_struct *this_cpu_ksoftirqd(void)
518{
519 return this_cpu_read(ksoftirqd);
520}
521
522/* Tasklets --- multithreaded analogue of BHs.
523
524 Main feature differing them of generic softirqs: tasklet
525 is running only on one CPU simultaneously.
526
527 Main feature differing them of BHs: different tasklets
528 may be run simultaneously on different CPUs.
529
530 Properties:
531 * If tasklet_schedule() is called, then tasklet is guaranteed
532 to be executed on some cpu at least once after this.
533 * If the tasklet is already scheduled, but its execution is still not
534 started, it will be executed only once.
535 * If this tasklet is already running on another CPU (or schedule is called
536 from tasklet itself), it is rescheduled for later.
537 * Tasklet is strictly serialized wrt itself, but not
538 wrt another tasklets. If client needs some intertask synchronization,
539 he makes it with spinlocks.
540 */
541
542struct tasklet_struct
543{
544 struct tasklet_struct *next;
545 unsigned long state;
546 atomic_t count;
547 void (*func)(unsigned long);
548 unsigned long data;
549};
550
551#define DECLARE_TASKLET(name, func, data) \
552struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
553
554#define DECLARE_TASKLET_DISABLED(name, func, data) \
555struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
556
557
558enum
559{
560 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
561 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
562};
563
564#ifdef CONFIG_SMP
565static inline int tasklet_trylock(struct tasklet_struct *t)
566{
567 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
568}
569
570static inline void tasklet_unlock(struct tasklet_struct *t)
571{
572 smp_mb__before_atomic();
573 clear_bit(TASKLET_STATE_RUN, &(t)->state);
574}
575
576static inline void tasklet_unlock_wait(struct tasklet_struct *t)
577{
578 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
579}
580#else
581#define tasklet_trylock(t) 1
582#define tasklet_unlock_wait(t) do { } while (0)
583#define tasklet_unlock(t) do { } while (0)
584#endif
585
586extern void __tasklet_schedule(struct tasklet_struct *t);
587
588static inline void tasklet_schedule(struct tasklet_struct *t)
589{
590 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
591 __tasklet_schedule(t);
592}
593
594extern void __tasklet_hi_schedule(struct tasklet_struct *t);
595
596static inline void tasklet_hi_schedule(struct tasklet_struct *t)
597{
598 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
599 __tasklet_hi_schedule(t);
600}
601
602static inline void tasklet_disable_nosync(struct tasklet_struct *t)
603{
604 atomic_inc(&t->count);
605 smp_mb__after_atomic();
606}
607
608static inline void tasklet_disable(struct tasklet_struct *t)
609{
610 tasklet_disable_nosync(t);
611 tasklet_unlock_wait(t);
612 smp_mb();
613}
614
615static inline void tasklet_enable(struct tasklet_struct *t)
616{
617 smp_mb__before_atomic();
618 atomic_dec(&t->count);
619}
620
621extern void tasklet_kill(struct tasklet_struct *t);
622extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
623extern void tasklet_init(struct tasklet_struct *t,
624 void (*func)(unsigned long), unsigned long data);
625
626struct tasklet_hrtimer {
627 struct hrtimer timer;
628 struct tasklet_struct tasklet;
629 enum hrtimer_restart (*function)(struct hrtimer *);
630};
631
632extern void
633tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
634 enum hrtimer_restart (*function)(struct hrtimer *),
635 clockid_t which_clock, enum hrtimer_mode mode);
636
637static inline
638void tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
639 const enum hrtimer_mode mode)
640{
641 hrtimer_start(&ttimer->timer, time, mode);
642}
643
644static inline
645void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
646{
647 hrtimer_cancel(&ttimer->timer);
648 tasklet_kill(&ttimer->tasklet);
649}
650
651/*
652 * Autoprobing for irqs:
653 *
654 * probe_irq_on() and probe_irq_off() provide robust primitives
655 * for accurate IRQ probing during kernel initialization. They are
656 * reasonably simple to use, are not "fooled" by spurious interrupts,
657 * and, unlike other attempts at IRQ probing, they do not get hung on
658 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
659 *
660 * For reasonably foolproof probing, use them as follows:
661 *
662 * 1. clear and/or mask the device's internal interrupt.
663 * 2. sti();
664 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
665 * 4. enable the device and cause it to trigger an interrupt.
666 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
667 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
668 * 7. service the device to clear its pending interrupt.
669 * 8. loop again if paranoia is required.
670 *
671 * probe_irq_on() returns a mask of allocated irq's.
672 *
673 * probe_irq_off() takes the mask as a parameter,
674 * and returns the irq number which occurred,
675 * or zero if none occurred, or a negative irq number
676 * if more than one irq occurred.
677 */
678
679#if !defined(CONFIG_GENERIC_IRQ_PROBE)
680static inline unsigned long probe_irq_on(void)
681{
682 return 0;
683}
684static inline int probe_irq_off(unsigned long val)
685{
686 return 0;
687}
688static inline unsigned int probe_irq_mask(unsigned long val)
689{
690 return 0;
691}
692#else
693extern unsigned long probe_irq_on(void); /* returns 0 on failure */
694extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
695extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
696#endif
697
698#ifdef CONFIG_PROC_FS
699/* Initialize /proc/irq/ */
700extern void init_irq_proc(void);
701#else
702static inline void init_irq_proc(void)
703{
704}
705#endif
706
707#ifdef CONFIG_IRQ_TIMINGS
708void irq_timings_enable(void);
709void irq_timings_disable(void);
710u64 irq_timings_next_event(u64 now);
711#endif
712
713struct seq_file;
714int show_interrupts(struct seq_file *p, void *v);
715int arch_show_interrupts(struct seq_file *p, int prec);
716
717extern int early_irq_init(void);
718extern int arch_probe_nr_irqs(void);
719extern int arch_early_irq_init(void);
720
721/*
722 * We want to know which function is an entrypoint of a hardirq or a softirq.
723 */
724#define __irq_entry __attribute__((__section__(".irqentry.text")))
725#define __softirq_entry \
726 __attribute__((__section__(".softirqentry.text")))
727
728#endif
729