1 /* interrupt.h */
2 #ifndef _LINUX_INTERRUPT_H
3 #define _LINUX_INTERRUPT_H
4
5 #include <linux/kernel.h>
6 #include <linux/linkage.h>
7 #include <linux/bitops.h>
8 #include <linux/preempt.h>
9 #include <linux/cpumask.h>
10 #include <linux/irqreturn.h>
11 #include <linux/irqnr.h>
12 #include <linux/hardirq.h>
13 #include <linux/irqflags.h>
14 #include <linux/smp.h>
15 #include <linux/percpu.h>
16 #include <linux/hrtimer.h>
17 #include <linux/kref.h>
18 #include <linux/workqueue.h>
19
20 #include <linux/atomic.h>
21 #include <asm/ptrace.h>
22
23 /*
24 * These correspond to the IORESOURCE_IRQ_* defines in
25 * linux/ioport.h to select the interrupt line behaviour. When
26 * requesting an interrupt without specifying a IRQF_TRIGGER, the
27 * setting should be assumed to be "as already configured", which
28 * may be as per machine or firmware initialisation.
29 */
30 #define IRQF_TRIGGER_NONE 0x00000000
31 #define IRQF_TRIGGER_RISING 0x00000001
32 #define IRQF_TRIGGER_FALLING 0x00000002
33 #define IRQF_TRIGGER_HIGH 0x00000004
34 #define IRQF_TRIGGER_LOW 0x00000008
35 #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
36 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
37 #define IRQF_TRIGGER_PROBE 0x00000010
38
39 /*
40 * These flags used only by the kernel as part of the
41 * irq handling routines.
42 *
43 * IRQF_DISABLED - keep irqs disabled when calling the action handler.
44 * DEPRECATED. This flag is a NOOP and scheduled to be removed
45 * IRQF_SHARED - allow sharing the irq among several devices
46 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
47 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
48 * IRQF_PERCPU - Interrupt is per cpu
49 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
50 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
51 * registered first in an shared interrupt is considered for
52 * performance reasons)
53 * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
54 * Used by threaded interrupts which need to keep the
55 * irq line disabled until the threaded handler has been run.
56 * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend
57 * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
58 * IRQF_NO_THREAD - Interrupt cannot be threaded
59 * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
60 * resume time.
61 */
62 #define IRQF_DISABLED 0x00000020
63 #define IRQF_SHARED 0x00000080
64 #define IRQF_PROBE_SHARED 0x00000100
65 #define __IRQF_TIMER 0x00000200
66 #define IRQF_PERCPU 0x00000400
67 #define IRQF_NOBALANCING 0x00000800
68 #define IRQF_IRQPOLL 0x00001000
69 #define IRQF_ONESHOT 0x00002000
70 #define IRQF_NO_SUSPEND 0x00004000
71 #define IRQF_FORCE_RESUME 0x00008000
72 #define IRQF_NO_THREAD 0x00010000
73 #define IRQF_EARLY_RESUME 0x00020000
74
75 #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
76
77 /*
78 * These values can be returned by request_any_context_irq() and
79 * describe the context the interrupt will be run in.
80 *
81 * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
82 * IRQC_IS_NESTED - interrupt runs in a nested threaded context
83 */
84 enum {
85 IRQC_IS_HARDIRQ = 0,
86 IRQC_IS_NESTED,
87 };
88
89 typedef irqreturn_t (*irq_handler_t)(int, void *);
90
91 /**
92 * struct irqaction - per interrupt action descriptor
93 * @handler: interrupt handler function
94 * @name: name of the device
95 * @dev_id: cookie to identify the device
96 * @percpu_dev_id: cookie to identify the device
97 * @next: pointer to the next irqaction for shared interrupts
98 * @irq: interrupt number
99 * @flags: flags (see IRQF_* above)
100 * @thread_fn: interrupt handler function for threaded interrupts
101 * @thread: thread pointer for threaded interrupts
102 * @thread_flags: flags related to @thread
103 * @thread_mask: bitmask for keeping track of @thread activity
104 * @dir: pointer to the proc/irq/NN/name entry
105 */
106 struct irqaction {
107 irq_handler_t handler;
108 void *dev_id;
109 void __percpu *percpu_dev_id;
110 struct irqaction *next;
111 irq_handler_t thread_fn;
112 struct task_struct *thread;
113 unsigned int irq;
114 unsigned int flags;
115 unsigned long thread_flags;
116 unsigned long thread_mask;
117 const char *name;
118 struct proc_dir_entry *dir;
119 } ____cacheline_internodealigned_in_smp;
120
121 extern irqreturn_t no_action(int cpl, void *dev_id);
122
123 #ifdef CONFIG_GENERIC_HARDIRQS
124 extern int __must_check
125 request_threaded_irq(unsigned int irq, irq_handler_t handler,
126 irq_handler_t thread_fn,
127 unsigned long flags, const char *name, void *dev);
128
129 static inline int __must_check
130 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
131 const char *name, void *dev)
132 {
133 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
134 }
135
136 extern int __must_check
137 request_any_context_irq(unsigned int irq, irq_handler_t handler,
138 unsigned long flags, const char *name, void *dev_id);
139
140 extern int __must_check
141 request_percpu_irq(unsigned int irq, irq_handler_t handler,
142 const char *devname, void __percpu *percpu_dev_id);
143 #else
144
145 extern int __must_check
146 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
147 const char *name, void *dev);
148
149 /*
150 * Special function to avoid ifdeffery in kernel/irq/devres.c which
151 * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
152 * m68k). I really love these $@%#!* obvious Makefile references:
153 * ../../../kernel/irq/devres.o
154 */
155 static inline int __must_check
156 request_threaded_irq(unsigned int irq, irq_handler_t handler,
157 irq_handler_t thread_fn,
158 unsigned long flags, const char *name, void *dev)
159 {
160 return request_irq(irq, handler, flags, name, dev);
161 }
162
163 static inline int __must_check
164 request_any_context_irq(unsigned int irq, irq_handler_t handler,
165 unsigned long flags, const char *name, void *dev_id)
166 {
167 return request_irq(irq, handler, flags, name, dev_id);
168 }
169
170 static inline int __must_check
171 request_percpu_irq(unsigned int irq, irq_handler_t handler,
172 const char *devname, void __percpu *percpu_dev_id)
173 {
174 return request_irq(irq, handler, 0, devname, percpu_dev_id);
175 }
176 #endif
177
178 extern void free_irq(unsigned int, void *);
179 extern void free_percpu_irq(unsigned int, void __percpu *);
180
181 struct device;
182
183 extern int __must_check
184 devm_request_threaded_irq(struct device *dev, unsigned int irq,
185 irq_handler_t handler, irq_handler_t thread_fn,
186 unsigned long irqflags, const char *devname,
187 void *dev_id);
188
189 static inline int __must_check
190 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
191 unsigned long irqflags, const char *devname, void *dev_id)
192 {
193 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
194 devname, dev_id);
195 }
196
197 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
198
199 /*
200 * On lockdep we dont want to enable hardirqs in hardirq
201 * context. Use local_irq_enable_in_hardirq() to annotate
202 * kernel code that has to do this nevertheless (pretty much
203 * the only valid case is for old/broken hardware that is
204 * insanely slow).
205 *
206 * NOTE: in theory this might break fragile code that relies
207 * on hardirq delivery - in practice we dont seem to have such
208 * places left. So the only effect should be slightly increased
209 * irqs-off latencies.
210 */
211 #ifdef CONFIG_LOCKDEP
212 # define local_irq_enable_in_hardirq() do { } while (0)
213 #else
214 # define local_irq_enable_in_hardirq() local_irq_enable()
215 #endif
216
217 extern void disable_irq_nosync(unsigned int irq);
218 extern void disable_irq(unsigned int irq);
219 extern void disable_percpu_irq(unsigned int irq);
220 extern void enable_irq(unsigned int irq);
221 extern void enable_percpu_irq(unsigned int irq, unsigned int type);
222
223 /* The following three functions are for the core kernel use only. */
224 #ifdef CONFIG_GENERIC_HARDIRQS
225 extern void suspend_device_irqs(void);
226 extern void resume_device_irqs(void);
227 #ifdef CONFIG_PM_SLEEP
228 extern int check_wakeup_irqs(void);
229 #else
230 static inline int check_wakeup_irqs(void) { return 0; }
231 #endif
232 #else
233 static inline void suspend_device_irqs(void) { };
234 static inline void resume_device_irqs(void) { };
235 static inline int check_wakeup_irqs(void) { return 0; }
236 #endif
237
238 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
239
240 extern cpumask_var_t irq_default_affinity;
241
242 extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
243 extern int irq_can_set_affinity(unsigned int irq);
244 extern int irq_select_affinity(unsigned int irq);
245
246 extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
247
248 /**
249 * struct irq_affinity_notify - context for notification of IRQ affinity changes
250 * @irq: Interrupt to which notification applies
251 * @kref: Reference count, for internal use
252 * @work: Work item, for internal use
253 * @notify: Function to be called on change. This will be
254 * called in process context.
255 * @release: Function to be called on release. This will be
256 * called in process context. Once registered, the
257 * structure must only be freed when this function is
258 * called or later.
259 */
260 struct irq_affinity_notify {
261 unsigned int irq;
262 struct kref kref;
263 struct work_struct work;
264 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
265 void (*release)(struct kref *ref);
266 };
267
268 extern int
269 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
270
271 #else /* CONFIG_SMP */
272
273 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
274 {
275 return -EINVAL;
276 }
277
278 static inline int irq_can_set_affinity(unsigned int irq)
279 {
280 return 0;
281 }
282
283 static inline int irq_select_affinity(unsigned int irq) { return 0; }
284
285 static inline int irq_set_affinity_hint(unsigned int irq,
286 const struct cpumask *m)
287 {
288 return -EINVAL;
289 }
290 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
291
292 #ifdef CONFIG_GENERIC_HARDIRQS
293 /*
294 * Special lockdep variants of irq disabling/enabling.
295 * These should be used for locking constructs that
296 * know that a particular irq context which is disabled,
297 * and which is the only irq-context user of a lock,
298 * that it's safe to take the lock in the irq-disabled
299 * section without disabling hardirqs.
300 *
301 * On !CONFIG_LOCKDEP they are equivalent to the normal
302 * irq disable/enable methods.
303 */
304 static inline void disable_irq_nosync_lockdep(unsigned int irq)
305 {
306 disable_irq_nosync(irq);
307 #ifdef CONFIG_LOCKDEP
308 local_irq_disable();
309 #endif
310 }
311
312 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
313 {
314 disable_irq_nosync(irq);
315 #ifdef CONFIG_LOCKDEP
316 local_irq_save(*flags);
317 #endif
318 }
319
320 static inline void disable_irq_lockdep(unsigned int irq)
321 {
322 disable_irq(irq);
323 #ifdef CONFIG_LOCKDEP
324 local_irq_disable();
325 #endif
326 }
327
328 static inline void enable_irq_lockdep(unsigned int irq)
329 {
330 #ifdef CONFIG_LOCKDEP
331 local_irq_enable();
332 #endif
333 enable_irq(irq);
334 }
335
336 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
337 {
338 #ifdef CONFIG_LOCKDEP
339 local_irq_restore(*flags);
340 #endif
341 enable_irq(irq);
342 }
343
344 /* IRQ wakeup (PM) control: */
345 extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
346
347 static inline int enable_irq_wake(unsigned int irq)
348 {
349 return irq_set_irq_wake(irq, 1);
350 }
351
352 static inline int disable_irq_wake(unsigned int irq)
353 {
354 return irq_set_irq_wake(irq, 0);
355 }
356
357 #else /* !CONFIG_GENERIC_HARDIRQS */
358 /*
359 * NOTE: non-genirq architectures, if they want to support the lock
360 * validator need to define the methods below in their asm/irq.h
361 * files, under an #ifdef CONFIG_LOCKDEP section.
362 */
363 #ifndef CONFIG_LOCKDEP
364 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
365 # define disable_irq_nosync_lockdep_irqsave(irq, flags) \
366 disable_irq_nosync(irq)
367 # define disable_irq_lockdep(irq) disable_irq(irq)
368 # define enable_irq_lockdep(irq) enable_irq(irq)
369 # define enable_irq_lockdep_irqrestore(irq, flags) \
370 enable_irq(irq)
371 # endif
372
373 static inline int enable_irq_wake(unsigned int irq)
374 {
375 return 0;
376 }
377
378 static inline int disable_irq_wake(unsigned int irq)
379 {
380 return 0;
381 }
382 #endif /* CONFIG_GENERIC_HARDIRQS */
383
384
385 #ifdef CONFIG_IRQ_FORCED_THREADING
386 extern bool force_irqthreads;
387 #else
388 #define force_irqthreads (0)
389 #endif
390
391 #ifndef __ARCH_SET_SOFTIRQ_PENDING
392 #define set_softirq_pending(x) (local_softirq_pending() = (x))
393 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
394 #endif
395
396 /* Some architectures might implement lazy enabling/disabling of
397 * interrupts. In some cases, such as stop_machine, we might want
398 * to ensure that after a local_irq_disable(), interrupts have
399 * really been disabled in hardware. Such architectures need to
400 * implement the following hook.
401 */
402 #ifndef hard_irq_disable
403 #define hard_irq_disable() do { } while(0)
404 #endif
405
406 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
407 frequency threaded job scheduling. For almost all the purposes
408 tasklets are more than enough. F.e. all serial device BHs et
409 al. should be converted to tasklets, not to softirqs.
410 */
411
412 enum
413 {
414 HI_SOFTIRQ=0,
415 TIMER_SOFTIRQ,
416 NET_TX_SOFTIRQ,
417 NET_RX_SOFTIRQ,
418 BLOCK_SOFTIRQ,
419 BLOCK_IOPOLL_SOFTIRQ,
420 TASKLET_SOFTIRQ,
421 SCHED_SOFTIRQ,
422 HRTIMER_SOFTIRQ,
423 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
424
425 NR_SOFTIRQS
426 };
427
428 #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
429
430 /* map softirq index to softirq name. update 'softirq_to_name' in
431 * kernel/softirq.c when adding a new softirq.
432 */
433 extern char *softirq_to_name[NR_SOFTIRQS];
434
435 /* softirq mask and active fields moved to irq_cpustat_t in
436 * asm/hardirq.h to get better cache usage. KAO
437 */
438
439 struct softirq_action
440 {
441 void (*action)(struct softirq_action *);
442 };
443
444 asmlinkage void do_softirq(void);
445 asmlinkage void __do_softirq(void);
446 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
447 extern void softirq_init(void);
448 extern void __raise_softirq_irqoff(unsigned int nr);
449
450 extern void raise_softirq_irqoff(unsigned int nr);
451 extern void raise_softirq(unsigned int nr);
452
453 /* This is the worklist that queues up per-cpu softirq work.
454 *
455 * send_remote_sendirq() adds work to these lists, and
456 * the softirq handler itself dequeues from them. The queues
457 * are protected by disabling local cpu interrupts and they must
458 * only be accessed by the local cpu that they are for.
459 */
460 DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
461
462 DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
463
464 static inline struct task_struct *this_cpu_ksoftirqd(void)
465 {
466 return this_cpu_read(ksoftirqd);
467 }
468
469 /* Try to send a softirq to a remote cpu. If this cannot be done, the
470 * work will be queued to the local cpu.
471 */
472 extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
473
474 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
475 * and compute the current cpu, passed in as 'this_cpu'.
476 */
477 extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
478 int this_cpu, int softirq);
479
480 /* Tasklets --- multithreaded analogue of BHs.
481
482 Main feature differing them of generic softirqs: tasklet
483 is running only on one CPU simultaneously.
484
485 Main feature differing them of BHs: different tasklets
486 may be run simultaneously on different CPUs.
487
488 Properties:
489 * If tasklet_schedule() is called, then tasklet is guaranteed
490 to be executed on some cpu at least once after this.
491 * If the tasklet is already scheduled, but its execution is still not
492 started, it will be executed only once.
493 * If this tasklet is already running on another CPU (or schedule is called
494 from tasklet itself), it is rescheduled for later.
495 * Tasklet is strictly serialized wrt itself, but not
496 wrt another tasklets. If client needs some intertask synchronization,
497 he makes it with spinlocks.
498 */
499
500 struct tasklet_struct
501 {
502 struct tasklet_struct *next;
503 unsigned long state;
504 atomic_t count;
505 void (*func)(unsigned long);
506 unsigned long data;
507 };
508
509 #define DECLARE_TASKLET(name, func, data) \
510 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
511
512 #define DECLARE_TASKLET_DISABLED(name, func, data) \
513 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
514
515
516 enum
517 {
518 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
519 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
520 };
521
522 #ifdef CONFIG_SMP
523 static inline int tasklet_trylock(struct tasklet_struct *t)
524 {
525 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
526 }
527
528 static inline void tasklet_unlock(struct tasklet_struct *t)
529 {
530 smp_mb__before_clear_bit();
531 clear_bit(TASKLET_STATE_RUN, &(t)->state);
532 }
533
534 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
535 {
536 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
537 }
538 #else
539 #define tasklet_trylock(t) 1
540 #define tasklet_unlock_wait(t) do { } while (0)
541 #define tasklet_unlock(t) do { } while (0)
542 #endif
543
544 extern void __tasklet_schedule(struct tasklet_struct *t);
545
546 static inline void tasklet_schedule(struct tasklet_struct *t)
547 {
548 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
549 __tasklet_schedule(t);
550 }
551
552 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
553
554 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
555 {
556 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
557 __tasklet_hi_schedule(t);
558 }
559
560 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
561
562 /*
563 * This version avoids touching any other tasklets. Needed for kmemcheck
564 * in order not to take any page faults while enqueueing this tasklet;
565 * consider VERY carefully whether you really need this or
566 * tasklet_hi_schedule()...
567 */
568 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
569 {
570 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
571 __tasklet_hi_schedule_first(t);
572 }
573
574
575 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
576 {
577 atomic_inc(&t->count);
578 smp_mb__after_atomic_inc();
579 }
580
581 static inline void tasklet_disable(struct tasklet_struct *t)
582 {
583 tasklet_disable_nosync(t);
584 tasklet_unlock_wait(t);
585 smp_mb();
586 }
587
588 static inline void tasklet_enable(struct tasklet_struct *t)
589 {
590 smp_mb__before_atomic_dec();
591 atomic_dec(&t->count);
592 }
593
594 static inline void tasklet_hi_enable(struct tasklet_struct *t)
595 {
596 smp_mb__before_atomic_dec();
597 atomic_dec(&t->count);
598 }
599
600 extern void tasklet_kill(struct tasklet_struct *t);
601 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
602 extern void tasklet_init(struct tasklet_struct *t,
603 void (*func)(unsigned long), unsigned long data);
604
605 struct tasklet_hrtimer {
606 struct hrtimer timer;
607 struct tasklet_struct tasklet;
608 enum hrtimer_restart (*function)(struct hrtimer *);
609 };
610
611 extern void
612 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
613 enum hrtimer_restart (*function)(struct hrtimer *),
614 clockid_t which_clock, enum hrtimer_mode mode);
615
616 static inline
617 int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
618 const enum hrtimer_mode mode)
619 {
620 return hrtimer_start(&ttimer->timer, time, mode);
621 }
622
623 static inline
624 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
625 {
626 hrtimer_cancel(&ttimer->timer);
627 tasklet_kill(&ttimer->tasklet);
628 }
629
630 /*
631 * Autoprobing for irqs:
632 *
633 * probe_irq_on() and probe_irq_off() provide robust primitives
634 * for accurate IRQ probing during kernel initialization. They are
635 * reasonably simple to use, are not "fooled" by spurious interrupts,
636 * and, unlike other attempts at IRQ probing, they do not get hung on
637 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
638 *
639 * For reasonably foolproof probing, use them as follows:
640 *
641 * 1. clear and/or mask the device's internal interrupt.
642 * 2. sti();
643 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
644 * 4. enable the device and cause it to trigger an interrupt.
645 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
646 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
647 * 7. service the device to clear its pending interrupt.
648 * 8. loop again if paranoia is required.
649 *
650 * probe_irq_on() returns a mask of allocated irq's.
651 *
652 * probe_irq_off() takes the mask as a parameter,
653 * and returns the irq number which occurred,
654 * or zero if none occurred, or a negative irq number
655 * if more than one irq occurred.
656 */
657
658 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
659 static inline unsigned long probe_irq_on(void)
660 {
661 return 0;
662 }
663 static inline int probe_irq_off(unsigned long val)
664 {
665 return 0;
666 }
667 static inline unsigned int probe_irq_mask(unsigned long val)
668 {
669 return 0;
670 }
671 #else
672 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
673 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
674 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
675 #endif
676
677 #ifdef CONFIG_PROC_FS
678 /* Initialize /proc/irq/ */
679 extern void init_irq_proc(void);
680 #else
681 static inline void init_irq_proc(void)
682 {
683 }
684 #endif
685
686 struct seq_file;
687 int show_interrupts(struct seq_file *p, void *v);
688 int arch_show_interrupts(struct seq_file *p, int prec);
689
690 extern int early_irq_init(void);
691 extern int arch_probe_nr_irqs(void);
692 extern int arch_early_irq_init(void);
693
694 #endif
695
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