Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

Linux/include/linux/interrupt.h

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

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us