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 */
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
159extern int __must_check
160request_nmi(unsigned int irq, irq_handler_t handler, unsigned long flags,
161 const char *name, void *dev);
162
163static inline int __must_check
164request_percpu_irq(unsigned int irq, irq_handler_t handler,
165 const char *devname, void __percpu *percpu_dev_id)
166{
167 return __request_percpu_irq(irq, handler, 0,
168 devname, percpu_dev_id);
169}
170
171extern int __must_check
172request_percpu_nmi(unsigned int irq, irq_handler_t handler,
173 const char *devname, void __percpu *dev);
174
175extern const void *free_irq(unsigned int, void *);
176extern void free_percpu_irq(unsigned int, void __percpu *);
177
178extern const void *free_nmi(unsigned int irq, void *dev_id);
179extern void free_percpu_nmi(unsigned int irq, void __percpu *percpu_dev_id);
180
181struct device;
182
183extern int __must_check
184devm_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
189static inline int __must_check
190devm_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
197extern int __must_check
198devm_request_any_context_irq(struct device *dev, unsigned int irq,
199 irq_handler_t handler, unsigned long irqflags,
200 const char *devname, void *dev_id);
201
202extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
203
204/*
205 * On lockdep we dont want to enable hardirqs in hardirq
206 * context. Use local_irq_enable_in_hardirq() to annotate
207 * kernel code that has to do this nevertheless (pretty much
208 * the only valid case is for old/broken hardware that is
209 * insanely slow).
210 *
211 * NOTE: in theory this might break fragile code that relies
212 * on hardirq delivery - in practice we dont seem to have such
213 * places left. So the only effect should be slightly increased
214 * irqs-off latencies.
215 */
216#ifdef CONFIG_LOCKDEP
217# define local_irq_enable_in_hardirq() do { } while (0)
218#else
219# define local_irq_enable_in_hardirq() local_irq_enable()
220#endif
221
222extern void disable_irq_nosync(unsigned int irq);
223extern bool disable_hardirq(unsigned int irq);
224extern void disable_irq(unsigned int irq);
225extern void disable_percpu_irq(unsigned int irq);
226extern void enable_irq(unsigned int irq);
227extern void enable_percpu_irq(unsigned int irq, unsigned int type);
228extern bool irq_percpu_is_enabled(unsigned int irq);
229extern void irq_wake_thread(unsigned int irq, void *dev_id);
230
231extern void disable_nmi_nosync(unsigned int irq);
232extern void disable_percpu_nmi(unsigned int irq);
233extern void enable_nmi(unsigned int irq);
234extern void enable_percpu_nmi(unsigned int irq, unsigned int type);
235extern int prepare_percpu_nmi(unsigned int irq);
236extern void teardown_percpu_nmi(unsigned int irq);
237
238/* The following three functions are for the core kernel use only. */
239extern void suspend_device_irqs(void);
240extern void resume_device_irqs(void);
241
242/**
243 * struct irq_affinity_notify - context for notification of IRQ affinity changes
244 * @irq: Interrupt to which notification applies
245 * @kref: Reference count, for internal use
246 * @work: Work item, for internal use
247 * @notify: Function to be called on change. This will be
248 * called in process context.
249 * @release: Function to be called on release. This will be
250 * called in process context. Once registered, the
251 * structure must only be freed when this function is
252 * called or later.
253 */
254struct irq_affinity_notify {
255 unsigned int irq;
256 struct kref kref;
257 struct work_struct work;
258 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
259 void (*release)(struct kref *ref);
260};
261
262#define IRQ_AFFINITY_MAX_SETS 4
263
264/**
265 * struct irq_affinity - Description for automatic irq affinity assignements
266 * @pre_vectors: Don't apply affinity to @pre_vectors at beginning of
267 * the MSI(-X) vector space
268 * @post_vectors: Don't apply affinity to @post_vectors at end of
269 * the MSI(-X) vector space
270 * @nr_sets: The number of interrupt sets for which affinity
271 * spreading is required
272 * @set_size: Array holding the size of each interrupt set
273 * @calc_sets: Callback for calculating the number and size
274 * of interrupt sets
275 * @priv: Private data for usage by @calc_sets, usually a
276 * pointer to driver/device specific data.
277 */
278struct irq_affinity {
279 unsigned int pre_vectors;
280 unsigned int post_vectors;
281 unsigned int nr_sets;
282 unsigned int set_size[IRQ_AFFINITY_MAX_SETS];
283 void (*calc_sets)(struct irq_affinity *, unsigned int nvecs);
284 void *priv;
285};
286
287/**
288 * struct irq_affinity_desc - Interrupt affinity descriptor
289 * @mask: cpumask to hold the affinity assignment
290 * @is_managed: 1 if the interrupt is managed internally
291 */
292struct irq_affinity_desc {
293 struct cpumask mask;
294 unsigned int is_managed : 1;
295};
296
297#if defined(CONFIG_SMP)
298
299extern cpumask_var_t irq_default_affinity;
300
301/* Internal implementation. Use the helpers below */
302extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
303 bool force);
304
305/**
306 * irq_set_affinity - Set the irq affinity of a given irq
307 * @irq: Interrupt to set affinity
308 * @cpumask: cpumask
309 *
310 * Fails if cpumask does not contain an online CPU
311 */
312static inline int
313irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
314{
315 return __irq_set_affinity(irq, cpumask, false);
316}
317
318/**
319 * irq_force_affinity - Force the irq affinity of a given irq
320 * @irq: Interrupt to set affinity
321 * @cpumask: cpumask
322 *
323 * Same as irq_set_affinity, but without checking the mask against
324 * online cpus.
325 *
326 * Solely for low level cpu hotplug code, where we need to make per
327 * cpu interrupts affine before the cpu becomes online.
328 */
329static inline int
330irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
331{
332 return __irq_set_affinity(irq, cpumask, true);
333}
334
335extern int irq_can_set_affinity(unsigned int irq);
336extern int irq_select_affinity(unsigned int irq);
337
338extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
339
340extern int
341irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
342
343struct irq_affinity_desc *
344irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd);
345
346unsigned int irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec,
347 const struct irq_affinity *affd);
348
349#else /* CONFIG_SMP */
350
351static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
352{
353 return -EINVAL;
354}
355
356static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
357{
358 return 0;
359}
360
361static inline int irq_can_set_affinity(unsigned int irq)
362{
363 return 0;
364}
365
366static inline int irq_select_affinity(unsigned int irq) { return 0; }
367
368static inline int irq_set_affinity_hint(unsigned int irq,
369 const struct cpumask *m)
370{
371 return -EINVAL;
372}
373
374static inline int
375irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
376{
377 return 0;
378}
379
380static inline struct irq_affinity_desc *
381irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd)
382{
383 return NULL;
384}
385
386static inline unsigned int
387irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec,
388 const struct irq_affinity *affd)
389{
390 return maxvec;
391}
392
393#endif /* CONFIG_SMP */
394
395/*
396 * Special lockdep variants of irq disabling/enabling.
397 * These should be used for locking constructs that
398 * know that a particular irq context which is disabled,
399 * and which is the only irq-context user of a lock,
400 * that it's safe to take the lock in the irq-disabled
401 * section without disabling hardirqs.
402 *
403 * On !CONFIG_LOCKDEP they are equivalent to the normal
404 * irq disable/enable methods.
405 */
406static inline void disable_irq_nosync_lockdep(unsigned int irq)
407{
408 disable_irq_nosync(irq);
409#ifdef CONFIG_LOCKDEP
410 local_irq_disable();
411#endif
412}
413
414static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
415{
416 disable_irq_nosync(irq);
417#ifdef CONFIG_LOCKDEP
418 local_irq_save(*flags);
419#endif
420}
421
422static inline void disable_irq_lockdep(unsigned int irq)
423{
424 disable_irq(irq);
425#ifdef CONFIG_LOCKDEP
426 local_irq_disable();
427#endif
428}
429
430static inline void enable_irq_lockdep(unsigned int irq)
431{
432#ifdef CONFIG_LOCKDEP
433 local_irq_enable();
434#endif
435 enable_irq(irq);
436}
437
438static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
439{
440#ifdef CONFIG_LOCKDEP
441 local_irq_restore(*flags);
442#endif
443 enable_irq(irq);
444}
445
446/* IRQ wakeup (PM) control: */
447extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
448
449static inline int enable_irq_wake(unsigned int irq)
450{
451 return irq_set_irq_wake(irq, 1);
452}
453
454static inline int disable_irq_wake(unsigned int irq)
455{
456 return irq_set_irq_wake(irq, 0);
457}
458
459/*
460 * irq_get_irqchip_state/irq_set_irqchip_state specific flags
461 */
462enum irqchip_irq_state {
463 IRQCHIP_STATE_PENDING, /* Is interrupt pending? */
464 IRQCHIP_STATE_ACTIVE, /* Is interrupt in progress? */
465 IRQCHIP_STATE_MASKED, /* Is interrupt masked? */
466 IRQCHIP_STATE_LINE_LEVEL, /* Is IRQ line high? */
467};
468
469extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
470 bool *state);
471extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
472 bool state);
473
474#ifdef CONFIG_IRQ_FORCED_THREADING
475extern bool force_irqthreads;
476#else
477#define force_irqthreads (0)
478#endif
479
480#ifndef local_softirq_pending
481
482#ifndef local_softirq_pending_ref
483#define local_softirq_pending_ref irq_stat.__softirq_pending
484#endif
485
486#define local_softirq_pending() (__this_cpu_read(local_softirq_pending_ref))
487#define set_softirq_pending(x) (__this_cpu_write(local_softirq_pending_ref, (x)))
488#define or_softirq_pending(x) (__this_cpu_or(local_softirq_pending_ref, (x)))
489
490#endif /* local_softirq_pending */
491
492/* Some architectures might implement lazy enabling/disabling of
493 * interrupts. In some cases, such as stop_machine, we might want
494 * to ensure that after a local_irq_disable(), interrupts have
495 * really been disabled in hardware. Such architectures need to
496 * implement the following hook.
497 */
498#ifndef hard_irq_disable
499#define hard_irq_disable() do { } while(0)
500#endif
501
502/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
503 frequency threaded job scheduling. For almost all the purposes
504 tasklets are more than enough. F.e. all serial device BHs et
505 al. should be converted to tasklets, not to softirqs.
506 */
507
508enum
509{
510 HI_SOFTIRQ=0,
511 TIMER_SOFTIRQ,
512 NET_TX_SOFTIRQ,
513 NET_RX_SOFTIRQ,
514 BLOCK_SOFTIRQ,
515 IRQ_POLL_SOFTIRQ,
516 TASKLET_SOFTIRQ,
517 SCHED_SOFTIRQ,
518 HRTIMER_SOFTIRQ, /* Unused, but kept as tools rely on the
519 numbering. Sigh! */
520 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
521
522 NR_SOFTIRQS
523};
524
525#define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
526
527/* map softirq index to softirq name. update 'softirq_to_name' in
528 * kernel/softirq.c when adding a new softirq.
529 */
530extern const char * const softirq_to_name[NR_SOFTIRQS];
531
532/* softirq mask and active fields moved to irq_cpustat_t in
533 * asm/hardirq.h to get better cache usage. KAO
534 */
535
536struct softirq_action
537{
538 void (*action)(struct softirq_action *);
539};
540
541asmlinkage void do_softirq(void);
542asmlinkage void __do_softirq(void);
543
544#ifdef __ARCH_HAS_DO_SOFTIRQ
545void do_softirq_own_stack(void);
546#else
547static inline void do_softirq_own_stack(void)
548{
549 __do_softirq();
550}
551#endif
552
553extern void open_softirq(int nr, void (*action)(struct softirq_action *));
554extern void softirq_init(void);
555extern void __raise_softirq_irqoff(unsigned int nr);
556
557extern void raise_softirq_irqoff(unsigned int nr);
558extern void raise_softirq(unsigned int nr);
559
560DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
561
562static inline struct task_struct *this_cpu_ksoftirqd(void)
563{
564 return this_cpu_read(ksoftirqd);
565}
566
567/* Tasklets --- multithreaded analogue of BHs.
568
569 Main feature differing them of generic softirqs: tasklet
570 is running only on one CPU simultaneously.
571
572 Main feature differing them of BHs: different tasklets
573 may be run simultaneously on different CPUs.
574
575 Properties:
576 * If tasklet_schedule() is called, then tasklet is guaranteed
577 to be executed on some cpu at least once after this.
578 * If the tasklet is already scheduled, but its execution is still not
579 started, it will be executed only once.
580 * If this tasklet is already running on another CPU (or schedule is called
581 from tasklet itself), it is rescheduled for later.
582 * Tasklet is strictly serialized wrt itself, but not
583 wrt another tasklets. If client needs some intertask synchronization,
584 he makes it with spinlocks.
585 */
586
587struct tasklet_struct
588{
589 struct tasklet_struct *next;
590 unsigned long state;
591 atomic_t count;
592 void (*func)(unsigned long);
593 unsigned long data;
594};
595
596#define DECLARE_TASKLET(name, func, data) \
597struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
598
599#define DECLARE_TASKLET_DISABLED(name, func, data) \
600struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
601
602
603enum
604{
605 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
606 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
607};
608
609#ifdef CONFIG_SMP
610static inline int tasklet_trylock(struct tasklet_struct *t)
611{
612 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
613}
614
615static inline void tasklet_unlock(struct tasklet_struct *t)
616{
617 smp_mb__before_atomic();
618 clear_bit(TASKLET_STATE_RUN, &(t)->state);
619}
620
621static inline void tasklet_unlock_wait(struct tasklet_struct *t)
622{
623 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
624}
625#else
626#define tasklet_trylock(t) 1
627#define tasklet_unlock_wait(t) do { } while (0)
628#define tasklet_unlock(t) do { } while (0)
629#endif
630
631extern void __tasklet_schedule(struct tasklet_struct *t);
632
633static inline void tasklet_schedule(struct tasklet_struct *t)
634{
635 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
636 __tasklet_schedule(t);
637}
638
639extern void __tasklet_hi_schedule(struct tasklet_struct *t);
640
641static inline void tasklet_hi_schedule(struct tasklet_struct *t)
642{
643 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
644 __tasklet_hi_schedule(t);
645}
646
647static inline void tasklet_disable_nosync(struct tasklet_struct *t)
648{
649 atomic_inc(&t->count);
650 smp_mb__after_atomic();
651}
652
653static inline void tasklet_disable(struct tasklet_struct *t)
654{
655 tasklet_disable_nosync(t);
656 tasklet_unlock_wait(t);
657 smp_mb();
658}
659
660static inline void tasklet_enable(struct tasklet_struct *t)
661{
662 smp_mb__before_atomic();
663 atomic_dec(&t->count);
664}
665
666extern void tasklet_kill(struct tasklet_struct *t);
667extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
668extern void tasklet_init(struct tasklet_struct *t,
669 void (*func)(unsigned long), unsigned long data);
670
671struct tasklet_hrtimer {
672 struct hrtimer timer;
673 struct tasklet_struct tasklet;
674 enum hrtimer_restart (*function)(struct hrtimer *);
675};
676
677extern void
678tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
679 enum hrtimer_restart (*function)(struct hrtimer *),
680 clockid_t which_clock, enum hrtimer_mode mode);
681
682static inline
683void tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
684 const enum hrtimer_mode mode)
685{
686 hrtimer_start(&ttimer->timer, time, mode);
687}
688
689static inline
690void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
691{
692 hrtimer_cancel(&ttimer->timer);
693 tasklet_kill(&ttimer->tasklet);
694}
695
696/*
697 * Autoprobing for irqs:
698 *
699 * probe_irq_on() and probe_irq_off() provide robust primitives
700 * for accurate IRQ probing during kernel initialization. They are
701 * reasonably simple to use, are not "fooled" by spurious interrupts,
702 * and, unlike other attempts at IRQ probing, they do not get hung on
703 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
704 *
705 * For reasonably foolproof probing, use them as follows:
706 *
707 * 1. clear and/or mask the device's internal interrupt.
708 * 2. sti();
709 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
710 * 4. enable the device and cause it to trigger an interrupt.
711 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
712 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
713 * 7. service the device to clear its pending interrupt.
714 * 8. loop again if paranoia is required.
715 *
716 * probe_irq_on() returns a mask of allocated irq's.
717 *
718 * probe_irq_off() takes the mask as a parameter,
719 * and returns the irq number which occurred,
720 * or zero if none occurred, or a negative irq number
721 * if more than one irq occurred.
722 */
723
724#if !defined(CONFIG_GENERIC_IRQ_PROBE)
725static inline unsigned long probe_irq_on(void)
726{
727 return 0;
728}
729static inline int probe_irq_off(unsigned long val)
730{
731 return 0;
732}
733static inline unsigned int probe_irq_mask(unsigned long val)
734{
735 return 0;
736}
737#else
738extern unsigned long probe_irq_on(void); /* returns 0 on failure */
739extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
740extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
741#endif
742
743#ifdef CONFIG_PROC_FS
744/* Initialize /proc/irq/ */
745extern void init_irq_proc(void);
746#else
747static inline void init_irq_proc(void)
748{
749}
750#endif
751
752#ifdef CONFIG_IRQ_TIMINGS
753void irq_timings_enable(void);
754void irq_timings_disable(void);
755u64 irq_timings_next_event(u64 now);
756#endif
757
758struct seq_file;
759int show_interrupts(struct seq_file *p, void *v);
760int arch_show_interrupts(struct seq_file *p, int prec);
761
762extern int early_irq_init(void);
763extern int arch_probe_nr_irqs(void);
764extern int arch_early_irq_init(void);
765
766/*
767 * We want to know which function is an entrypoint of a hardirq or a softirq.
768 */
769#define __irq_entry __attribute__((__section__(".irqentry.text")))
770#define __softirq_entry \
771 __attribute__((__section__(".softirqentry.text")))
772
773#endif
774