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TOMOYO Linux Cross Reference
Linux/include/linux/interrupt.h

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  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 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.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 /*
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 
138 extern int __must_check
139 request_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 
143 static inline int __must_check
144 request_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 
150 extern int __must_check
151 request_any_context_irq(unsigned int irq, irq_handler_t handler,
152                         unsigned long flags, const char *name, void *dev_id);
153 
154 extern 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 
159 static inline int __must_check
160 request_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 
167 extern const void *free_irq(unsigned int, void *);
168 extern void free_percpu_irq(unsigned int, void __percpu *);
169 
170 struct device;
171 
172 extern int __must_check
173 devm_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 
178 static inline int __must_check
179 devm_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 
186 extern int __must_check
187 devm_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 
191 extern 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 
211 extern void disable_irq_nosync(unsigned int irq);
212 extern bool disable_hardirq(unsigned int irq);
213 extern void disable_irq(unsigned int irq);
214 extern void disable_percpu_irq(unsigned int irq);
215 extern void enable_irq(unsigned int irq);
216 extern void enable_percpu_irq(unsigned int irq, unsigned int type);
217 extern bool irq_percpu_is_enabled(unsigned int irq);
218 extern void irq_wake_thread(unsigned int irq, void *dev_id);
219 
220 /* The following three functions are for the core kernel use only. */
221 extern void suspend_device_irqs(void);
222 extern 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  */
236 struct 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  * @nr_sets:            Length of passed in *sets array
251  * @sets:               Number of affinitized sets
252  */
253 struct irq_affinity {
254         int     pre_vectors;
255         int     post_vectors;
256         int     nr_sets;
257         int     *sets;
258 };
259 
260 /**
261  * struct irq_affinity_desc - Interrupt affinity descriptor
262  * @mask:       cpumask to hold the affinity assignment
263  * @is_managed: 1 if the interrupt is managed internally
264  */
265 struct irq_affinity_desc {
266         struct cpumask  mask;
267         unsigned int    is_managed : 1;
268 };
269 
270 #if defined(CONFIG_SMP)
271 
272 extern cpumask_var_t irq_default_affinity;
273 
274 /* Internal implementation. Use the helpers below */
275 extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
276                               bool force);
277 
278 /**
279  * irq_set_affinity - Set the irq affinity of a given irq
280  * @irq:        Interrupt to set affinity
281  * @cpumask:    cpumask
282  *
283  * Fails if cpumask does not contain an online CPU
284  */
285 static inline int
286 irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
287 {
288         return __irq_set_affinity(irq, cpumask, false);
289 }
290 
291 /**
292  * irq_force_affinity - Force the irq affinity of a given irq
293  * @irq:        Interrupt to set affinity
294  * @cpumask:    cpumask
295  *
296  * Same as irq_set_affinity, but without checking the mask against
297  * online cpus.
298  *
299  * Solely for low level cpu hotplug code, where we need to make per
300  * cpu interrupts affine before the cpu becomes online.
301  */
302 static inline int
303 irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
304 {
305         return __irq_set_affinity(irq, cpumask, true);
306 }
307 
308 extern int irq_can_set_affinity(unsigned int irq);
309 extern int irq_select_affinity(unsigned int irq);
310 
311 extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
312 
313 extern int
314 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
315 
316 struct irq_affinity_desc *
317 irq_create_affinity_masks(int nvec, const struct irq_affinity *affd);
318 
319 int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd);
320 
321 #else /* CONFIG_SMP */
322 
323 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
324 {
325         return -EINVAL;
326 }
327 
328 static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
329 {
330         return 0;
331 }
332 
333 static inline int irq_can_set_affinity(unsigned int irq)
334 {
335         return 0;
336 }
337 
338 static inline int irq_select_affinity(unsigned int irq)  { return 0; }
339 
340 static inline int irq_set_affinity_hint(unsigned int irq,
341                                         const struct cpumask *m)
342 {
343         return -EINVAL;
344 }
345 
346 static inline int
347 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
348 {
349         return 0;
350 }
351 
352 static inline struct irq_affinity_desc *
353 irq_create_affinity_masks(int nvec, const struct irq_affinity *affd)
354 {
355         return NULL;
356 }
357 
358 static inline int
359 irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd)
360 {
361         return maxvec;
362 }
363 
364 #endif /* CONFIG_SMP */
365 
366 /*
367  * Special lockdep variants of irq disabling/enabling.
368  * These should be used for locking constructs that
369  * know that a particular irq context which is disabled,
370  * and which is the only irq-context user of a lock,
371  * that it's safe to take the lock in the irq-disabled
372  * section without disabling hardirqs.
373  *
374  * On !CONFIG_LOCKDEP they are equivalent to the normal
375  * irq disable/enable methods.
376  */
377 static inline void disable_irq_nosync_lockdep(unsigned int irq)
378 {
379         disable_irq_nosync(irq);
380 #ifdef CONFIG_LOCKDEP
381         local_irq_disable();
382 #endif
383 }
384 
385 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
386 {
387         disable_irq_nosync(irq);
388 #ifdef CONFIG_LOCKDEP
389         local_irq_save(*flags);
390 #endif
391 }
392 
393 static inline void disable_irq_lockdep(unsigned int irq)
394 {
395         disable_irq(irq);
396 #ifdef CONFIG_LOCKDEP
397         local_irq_disable();
398 #endif
399 }
400 
401 static inline void enable_irq_lockdep(unsigned int irq)
402 {
403 #ifdef CONFIG_LOCKDEP
404         local_irq_enable();
405 #endif
406         enable_irq(irq);
407 }
408 
409 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
410 {
411 #ifdef CONFIG_LOCKDEP
412         local_irq_restore(*flags);
413 #endif
414         enable_irq(irq);
415 }
416 
417 /* IRQ wakeup (PM) control: */
418 extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
419 
420 static inline int enable_irq_wake(unsigned int irq)
421 {
422         return irq_set_irq_wake(irq, 1);
423 }
424 
425 static inline int disable_irq_wake(unsigned int irq)
426 {
427         return irq_set_irq_wake(irq, 0);
428 }
429 
430 /*
431  * irq_get_irqchip_state/irq_set_irqchip_state specific flags
432  */
433 enum irqchip_irq_state {
434         IRQCHIP_STATE_PENDING,          /* Is interrupt pending? */
435         IRQCHIP_STATE_ACTIVE,           /* Is interrupt in progress? */
436         IRQCHIP_STATE_MASKED,           /* Is interrupt masked? */
437         IRQCHIP_STATE_LINE_LEVEL,       /* Is IRQ line high? */
438 };
439 
440 extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
441                                  bool *state);
442 extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
443                                  bool state);
444 
445 #ifdef CONFIG_IRQ_FORCED_THREADING
446 extern bool force_irqthreads;
447 #else
448 #define force_irqthreads        (0)
449 #endif
450 
451 #ifndef local_softirq_pending
452 
453 #ifndef local_softirq_pending_ref
454 #define local_softirq_pending_ref irq_stat.__softirq_pending
455 #endif
456 
457 #define local_softirq_pending() (__this_cpu_read(local_softirq_pending_ref))
458 #define set_softirq_pending(x)  (__this_cpu_write(local_softirq_pending_ref, (x)))
459 #define or_softirq_pending(x)   (__this_cpu_or(local_softirq_pending_ref, (x)))
460 
461 #endif /* local_softirq_pending */
462 
463 /* Some architectures might implement lazy enabling/disabling of
464  * interrupts. In some cases, such as stop_machine, we might want
465  * to ensure that after a local_irq_disable(), interrupts have
466  * really been disabled in hardware. Such architectures need to
467  * implement the following hook.
468  */
469 #ifndef hard_irq_disable
470 #define hard_irq_disable()      do { } while(0)
471 #endif
472 
473 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
474    frequency threaded job scheduling. For almost all the purposes
475    tasklets are more than enough. F.e. all serial device BHs et
476    al. should be converted to tasklets, not to softirqs.
477  */
478 
479 enum
480 {
481         HI_SOFTIRQ=0,
482         TIMER_SOFTIRQ,
483         NET_TX_SOFTIRQ,
484         NET_RX_SOFTIRQ,
485         BLOCK_SOFTIRQ,
486         IRQ_POLL_SOFTIRQ,
487         TASKLET_SOFTIRQ,
488         SCHED_SOFTIRQ,
489         HRTIMER_SOFTIRQ, /* Unused, but kept as tools rely on the
490                             numbering. Sigh! */
491         RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */
492 
493         NR_SOFTIRQS
494 };
495 
496 #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
497 
498 /* map softirq index to softirq name. update 'softirq_to_name' in
499  * kernel/softirq.c when adding a new softirq.
500  */
501 extern const char * const softirq_to_name[NR_SOFTIRQS];
502 
503 /* softirq mask and active fields moved to irq_cpustat_t in
504  * asm/hardirq.h to get better cache usage.  KAO
505  */
506 
507 struct softirq_action
508 {
509         void    (*action)(struct softirq_action *);
510 };
511 
512 asmlinkage void do_softirq(void);
513 asmlinkage void __do_softirq(void);
514 
515 #ifdef __ARCH_HAS_DO_SOFTIRQ
516 void do_softirq_own_stack(void);
517 #else
518 static inline void do_softirq_own_stack(void)
519 {
520         __do_softirq();
521 }
522 #endif
523 
524 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
525 extern void softirq_init(void);
526 extern void __raise_softirq_irqoff(unsigned int nr);
527 
528 extern void raise_softirq_irqoff(unsigned int nr);
529 extern void raise_softirq(unsigned int nr);
530 
531 DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
532 
533 static inline struct task_struct *this_cpu_ksoftirqd(void)
534 {
535         return this_cpu_read(ksoftirqd);
536 }
537 
538 /* Tasklets --- multithreaded analogue of BHs.
539 
540    Main feature differing them of generic softirqs: tasklet
541    is running only on one CPU simultaneously.
542 
543    Main feature differing them of BHs: different tasklets
544    may be run simultaneously on different CPUs.
545 
546    Properties:
547    * If tasklet_schedule() is called, then tasklet is guaranteed
548      to be executed on some cpu at least once after this.
549    * If the tasklet is already scheduled, but its execution is still not
550      started, it will be executed only once.
551    * If this tasklet is already running on another CPU (or schedule is called
552      from tasklet itself), it is rescheduled for later.
553    * Tasklet is strictly serialized wrt itself, but not
554      wrt another tasklets. If client needs some intertask synchronization,
555      he makes it with spinlocks.
556  */
557 
558 struct tasklet_struct
559 {
560         struct tasklet_struct *next;
561         unsigned long state;
562         atomic_t count;
563         void (*func)(unsigned long);
564         unsigned long data;
565 };
566 
567 #define DECLARE_TASKLET(name, func, data) \
568 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
569 
570 #define DECLARE_TASKLET_DISABLED(name, func, data) \
571 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
572 
573 
574 enum
575 {
576         TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
577         TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
578 };
579 
580 #ifdef CONFIG_SMP
581 static inline int tasklet_trylock(struct tasklet_struct *t)
582 {
583         return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
584 }
585 
586 static inline void tasklet_unlock(struct tasklet_struct *t)
587 {
588         smp_mb__before_atomic();
589         clear_bit(TASKLET_STATE_RUN, &(t)->state);
590 }
591 
592 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
593 {
594         while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
595 }
596 #else
597 #define tasklet_trylock(t) 1
598 #define tasklet_unlock_wait(t) do { } while (0)
599 #define tasklet_unlock(t) do { } while (0)
600 #endif
601 
602 extern void __tasklet_schedule(struct tasklet_struct *t);
603 
604 static inline void tasklet_schedule(struct tasklet_struct *t)
605 {
606         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
607                 __tasklet_schedule(t);
608 }
609 
610 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
611 
612 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
613 {
614         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
615                 __tasklet_hi_schedule(t);
616 }
617 
618 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
619 {
620         atomic_inc(&t->count);
621         smp_mb__after_atomic();
622 }
623 
624 static inline void tasklet_disable(struct tasklet_struct *t)
625 {
626         tasklet_disable_nosync(t);
627         tasklet_unlock_wait(t);
628         smp_mb();
629 }
630 
631 static inline void tasklet_enable(struct tasklet_struct *t)
632 {
633         smp_mb__before_atomic();
634         atomic_dec(&t->count);
635 }
636 
637 extern void tasklet_kill(struct tasklet_struct *t);
638 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
639 extern void tasklet_init(struct tasklet_struct *t,
640                          void (*func)(unsigned long), unsigned long data);
641 
642 struct tasklet_hrtimer {
643         struct hrtimer          timer;
644         struct tasklet_struct   tasklet;
645         enum hrtimer_restart    (*function)(struct hrtimer *);
646 };
647 
648 extern void
649 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
650                      enum hrtimer_restart (*function)(struct hrtimer *),
651                      clockid_t which_clock, enum hrtimer_mode mode);
652 
653 static inline
654 void tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
655                            const enum hrtimer_mode mode)
656 {
657         hrtimer_start(&ttimer->timer, time, mode);
658 }
659 
660 static inline
661 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
662 {
663         hrtimer_cancel(&ttimer->timer);
664         tasklet_kill(&ttimer->tasklet);
665 }
666 
667 /*
668  * Autoprobing for irqs:
669  *
670  * probe_irq_on() and probe_irq_off() provide robust primitives
671  * for accurate IRQ probing during kernel initialization.  They are
672  * reasonably simple to use, are not "fooled" by spurious interrupts,
673  * and, unlike other attempts at IRQ probing, they do not get hung on
674  * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
675  *
676  * For reasonably foolproof probing, use them as follows:
677  *
678  * 1. clear and/or mask the device's internal interrupt.
679  * 2. sti();
680  * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
681  * 4. enable the device and cause it to trigger an interrupt.
682  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
683  * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
684  * 7. service the device to clear its pending interrupt.
685  * 8. loop again if paranoia is required.
686  *
687  * probe_irq_on() returns a mask of allocated irq's.
688  *
689  * probe_irq_off() takes the mask as a parameter,
690  * and returns the irq number which occurred,
691  * or zero if none occurred, or a negative irq number
692  * if more than one irq occurred.
693  */
694 
695 #if !defined(CONFIG_GENERIC_IRQ_PROBE) 
696 static inline unsigned long probe_irq_on(void)
697 {
698         return 0;
699 }
700 static inline int probe_irq_off(unsigned long val)
701 {
702         return 0;
703 }
704 static inline unsigned int probe_irq_mask(unsigned long val)
705 {
706         return 0;
707 }
708 #else
709 extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
710 extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
711 extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
712 #endif
713 
714 #ifdef CONFIG_PROC_FS
715 /* Initialize /proc/irq/ */
716 extern void init_irq_proc(void);
717 #else
718 static inline void init_irq_proc(void)
719 {
720 }
721 #endif
722 
723 #ifdef CONFIG_IRQ_TIMINGS
724 void irq_timings_enable(void);
725 void irq_timings_disable(void);
726 u64 irq_timings_next_event(u64 now);
727 #endif
728 
729 struct seq_file;
730 int show_interrupts(struct seq_file *p, void *v);
731 int arch_show_interrupts(struct seq_file *p, int prec);
732 
733 extern int early_irq_init(void);
734 extern int arch_probe_nr_irqs(void);
735 extern int arch_early_irq_init(void);
736 
737 /*
738  * We want to know which function is an entrypoint of a hardirq or a softirq.
739  */
740 #define __irq_entry              __attribute__((__section__(".irqentry.text")))
741 #define __softirq_entry  \
742         __attribute__((__section__(".softirqentry.text")))
743 
744 #endif
745 

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