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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.rst
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
143/**
144 * request_irq - Add a handler for an interrupt line
145 * @irq: The interrupt line to allocate
146 * @handler: Function to be called when the IRQ occurs.
147 * Primary handler for threaded interrupts
148 * If NULL, the default primary handler is installed
149 * @flags: Handling flags
150 * @name: Name of the device generating this interrupt
151 * @dev: A cookie passed to the handler function
152 *
153 * This call allocates an interrupt and establishes a handler; see
154 * the documentation for request_threaded_irq() for details.
155 */
156static inline int __must_check
157request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
158 const char *name, void *dev)
159{
160 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
161}
162
163extern int __must_check
164request_any_context_irq(unsigned int irq, irq_handler_t handler,
165 unsigned long flags, const char *name, void *dev_id);
166
167extern int __must_check
168__request_percpu_irq(unsigned int irq, irq_handler_t handler,
169 unsigned long flags, const char *devname,
170 void __percpu *percpu_dev_id);
171
172extern int __must_check
173request_nmi(unsigned int irq, irq_handler_t handler, unsigned long flags,
174 const char *name, void *dev);
175
176static inline int __must_check
177request_percpu_irq(unsigned int irq, irq_handler_t handler,
178 const char *devname, void __percpu *percpu_dev_id)
179{
180 return __request_percpu_irq(irq, handler, 0,
181 devname, percpu_dev_id);
182}
183
184extern int __must_check
185request_percpu_nmi(unsigned int irq, irq_handler_t handler,
186 const char *devname, void __percpu *dev);
187
188extern const void *free_irq(unsigned int, void *);
189extern void free_percpu_irq(unsigned int, void __percpu *);
190
191extern const void *free_nmi(unsigned int irq, void *dev_id);
192extern void free_percpu_nmi(unsigned int irq, void __percpu *percpu_dev_id);
193
194struct device;
195
196extern int __must_check
197devm_request_threaded_irq(struct device *dev, unsigned int irq,
198 irq_handler_t handler, irq_handler_t thread_fn,
199 unsigned long irqflags, const char *devname,
200 void *dev_id);
201
202static inline int __must_check
203devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
204 unsigned long irqflags, const char *devname, void *dev_id)
205{
206 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
207 devname, dev_id);
208}
209
210extern int __must_check
211devm_request_any_context_irq(struct device *dev, unsigned int irq,
212 irq_handler_t handler, unsigned long irqflags,
213 const char *devname, void *dev_id);
214
215extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
216
217/*
218 * On lockdep we dont want to enable hardirqs in hardirq
219 * context. Use local_irq_enable_in_hardirq() to annotate
220 * kernel code that has to do this nevertheless (pretty much
221 * the only valid case is for old/broken hardware that is
222 * insanely slow).
223 *
224 * NOTE: in theory this might break fragile code that relies
225 * on hardirq delivery - in practice we dont seem to have such
226 * places left. So the only effect should be slightly increased
227 * irqs-off latencies.
228 */
229#ifdef CONFIG_LOCKDEP
230# define local_irq_enable_in_hardirq() do { } while (0)
231#else
232# define local_irq_enable_in_hardirq() local_irq_enable()
233#endif
234
235extern void disable_irq_nosync(unsigned int irq);
236extern bool disable_hardirq(unsigned int irq);
237extern void disable_irq(unsigned int irq);
238extern void disable_percpu_irq(unsigned int irq);
239extern void enable_irq(unsigned int irq);
240extern void enable_percpu_irq(unsigned int irq, unsigned int type);
241extern bool irq_percpu_is_enabled(unsigned int irq);
242extern void irq_wake_thread(unsigned int irq, void *dev_id);
243
244extern void disable_nmi_nosync(unsigned int irq);
245extern void disable_percpu_nmi(unsigned int irq);
246extern void enable_nmi(unsigned int irq);
247extern void enable_percpu_nmi(unsigned int irq, unsigned int type);
248extern int prepare_percpu_nmi(unsigned int irq);
249extern void teardown_percpu_nmi(unsigned int irq);
250
251extern int irq_inject_interrupt(unsigned int irq);
252
253/* The following three functions are for the core kernel use only. */
254extern void suspend_device_irqs(void);
255extern void resume_device_irqs(void);
256extern void rearm_wake_irq(unsigned int irq);
257
258/**
259 * struct irq_affinity_notify - context for notification of IRQ affinity changes
260 * @irq: Interrupt to which notification applies
261 * @kref: Reference count, for internal use
262 * @work: Work item, for internal use
263 * @notify: Function to be called on change. This will be
264 * called in process context.
265 * @release: Function to be called on release. This will be
266 * called in process context. Once registered, the
267 * structure must only be freed when this function is
268 * called or later.
269 */
270struct irq_affinity_notify {
271 unsigned int irq;
272 struct kref kref;
273 struct work_struct work;
274 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
275 void (*release)(struct kref *ref);
276};
277
278#define IRQ_AFFINITY_MAX_SETS 4
279
280/**
281 * struct irq_affinity - Description for automatic irq affinity assignements
282 * @pre_vectors: Don't apply affinity to @pre_vectors at beginning of
283 * the MSI(-X) vector space
284 * @post_vectors: Don't apply affinity to @post_vectors at end of
285 * the MSI(-X) vector space
286 * @nr_sets: The number of interrupt sets for which affinity
287 * spreading is required
288 * @set_size: Array holding the size of each interrupt set
289 * @calc_sets: Callback for calculating the number and size
290 * of interrupt sets
291 * @priv: Private data for usage by @calc_sets, usually a
292 * pointer to driver/device specific data.
293 */
294struct irq_affinity {
295 unsigned int pre_vectors;
296 unsigned int post_vectors;
297 unsigned int nr_sets;
298 unsigned int set_size[IRQ_AFFINITY_MAX_SETS];
299 void (*calc_sets)(struct irq_affinity *, unsigned int nvecs);
300 void *priv;
301};
302
303/**
304 * struct irq_affinity_desc - Interrupt affinity descriptor
305 * @mask: cpumask to hold the affinity assignment
306 * @is_managed: 1 if the interrupt is managed internally
307 */
308struct irq_affinity_desc {
309 struct cpumask mask;
310 unsigned int is_managed : 1;
311};
312
313#if defined(CONFIG_SMP)
314
315extern cpumask_var_t irq_default_affinity;
316
317/* Internal implementation. Use the helpers below */
318extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
319 bool force);
320
321/**
322 * irq_set_affinity - Set the irq affinity of a given irq
323 * @irq: Interrupt to set affinity
324 * @cpumask: cpumask
325 *
326 * Fails if cpumask does not contain an online CPU
327 */
328static inline int
329irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
330{
331 return __irq_set_affinity(irq, cpumask, false);
332}
333
334/**
335 * irq_force_affinity - Force the irq affinity of a given irq
336 * @irq: Interrupt to set affinity
337 * @cpumask: cpumask
338 *
339 * Same as irq_set_affinity, but without checking the mask against
340 * online cpus.
341 *
342 * Solely for low level cpu hotplug code, where we need to make per
343 * cpu interrupts affine before the cpu becomes online.
344 */
345static inline int
346irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
347{
348 return __irq_set_affinity(irq, cpumask, true);
349}
350
351extern int irq_can_set_affinity(unsigned int irq);
352extern int irq_select_affinity(unsigned int irq);
353
354extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
355
356extern int
357irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
358
359struct irq_affinity_desc *
360irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd);
361
362unsigned int irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec,
363 const struct irq_affinity *affd);
364
365#else /* CONFIG_SMP */
366
367static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
368{
369 return -EINVAL;
370}
371
372static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
373{
374 return 0;
375}
376
377static inline int irq_can_set_affinity(unsigned int irq)
378{
379 return 0;
380}
381
382static inline int irq_select_affinity(unsigned int irq) { return 0; }
383
384static inline int irq_set_affinity_hint(unsigned int irq,
385 const struct cpumask *m)
386{
387 return -EINVAL;
388}
389
390static inline int
391irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
392{
393 return 0;
394}
395
396static inline struct irq_affinity_desc *
397irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd)
398{
399 return NULL;
400}
401
402static inline unsigned int
403irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec,
404 const struct irq_affinity *affd)
405{
406 return maxvec;
407}
408
409#endif /* CONFIG_SMP */
410
411/*
412 * Special lockdep variants of irq disabling/enabling.
413 * These should be used for locking constructs that
414 * know that a particular irq context which is disabled,
415 * and which is the only irq-context user of a lock,
416 * that it's safe to take the lock in the irq-disabled
417 * section without disabling hardirqs.
418 *
419 * On !CONFIG_LOCKDEP they are equivalent to the normal
420 * irq disable/enable methods.
421 */
422static inline void disable_irq_nosync_lockdep(unsigned int irq)
423{
424 disable_irq_nosync(irq);
425#ifdef CONFIG_LOCKDEP
426 local_irq_disable();
427#endif
428}
429
430static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
431{
432 disable_irq_nosync(irq);
433#ifdef CONFIG_LOCKDEP
434 local_irq_save(*flags);
435#endif
436}
437
438static inline void disable_irq_lockdep(unsigned int irq)
439{
440 disable_irq(irq);
441#ifdef CONFIG_LOCKDEP
442 local_irq_disable();
443#endif
444}
445
446static inline void enable_irq_lockdep(unsigned int irq)
447{
448#ifdef CONFIG_LOCKDEP
449 local_irq_enable();
450#endif
451 enable_irq(irq);
452}
453
454static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
455{
456#ifdef CONFIG_LOCKDEP
457 local_irq_restore(*flags);
458#endif
459 enable_irq(irq);
460}
461
462/* IRQ wakeup (PM) control: */
463extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
464
465static inline int enable_irq_wake(unsigned int irq)
466{
467 return irq_set_irq_wake(irq, 1);
468}
469
470static inline int disable_irq_wake(unsigned int irq)
471{
472 return irq_set_irq_wake(irq, 0);
473}
474
475/*
476 * irq_get_irqchip_state/irq_set_irqchip_state specific flags
477 */
478enum irqchip_irq_state {
479 IRQCHIP_STATE_PENDING, /* Is interrupt pending? */
480 IRQCHIP_STATE_ACTIVE, /* Is interrupt in progress? */
481 IRQCHIP_STATE_MASKED, /* Is interrupt masked? */
482 IRQCHIP_STATE_LINE_LEVEL, /* Is IRQ line high? */
483};
484
485extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
486 bool *state);
487extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
488 bool state);
489
490#ifdef CONFIG_IRQ_FORCED_THREADING
491# ifdef CONFIG_PREEMPT_RT
492# define force_irqthreads (true)
493# else
494extern bool force_irqthreads;
495# endif
496#else
497#define force_irqthreads (0)
498#endif
499
500#ifndef local_softirq_pending
501
502#ifndef local_softirq_pending_ref
503#define local_softirq_pending_ref irq_stat.__softirq_pending
504#endif
505
506#define local_softirq_pending() (__this_cpu_read(local_softirq_pending_ref))
507#define set_softirq_pending(x) (__this_cpu_write(local_softirq_pending_ref, (x)))
508#define or_softirq_pending(x) (__this_cpu_or(local_softirq_pending_ref, (x)))
509
510#endif /* local_softirq_pending */
511
512/* Some architectures might implement lazy enabling/disabling of
513 * interrupts. In some cases, such as stop_machine, we might want
514 * to ensure that after a local_irq_disable(), interrupts have
515 * really been disabled in hardware. Such architectures need to
516 * implement the following hook.
517 */
518#ifndef hard_irq_disable
519#define hard_irq_disable() do { } while(0)
520#endif
521
522/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
523 frequency threaded job scheduling. For almost all the purposes
524 tasklets are more than enough. F.e. all serial device BHs et
525 al. should be converted to tasklets, not to softirqs.
526 */
527
528enum
529{
530 HI_SOFTIRQ=0,
531 TIMER_SOFTIRQ,
532 NET_TX_SOFTIRQ,
533 NET_RX_SOFTIRQ,
534 BLOCK_SOFTIRQ,
535 IRQ_POLL_SOFTIRQ,
536 TASKLET_SOFTIRQ,
537 SCHED_SOFTIRQ,
538 HRTIMER_SOFTIRQ,
539 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
540
541 NR_SOFTIRQS
542};
543
544#define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
545
546/* map softirq index to softirq name. update 'softirq_to_name' in
547 * kernel/softirq.c when adding a new softirq.
548 */
549extern const char * const softirq_to_name[NR_SOFTIRQS];
550
551/* softirq mask and active fields moved to irq_cpustat_t in
552 * asm/hardirq.h to get better cache usage. KAO
553 */
554
555struct softirq_action
556{
557 void (*action)(struct softirq_action *);
558};
559
560asmlinkage void do_softirq(void);
561asmlinkage void __do_softirq(void);
562
563#ifdef __ARCH_HAS_DO_SOFTIRQ
564void do_softirq_own_stack(void);
565#else
566static inline void do_softirq_own_stack(void)
567{
568 __do_softirq();
569}
570#endif
571
572extern void open_softirq(int nr, void (*action)(struct softirq_action *));
573extern void softirq_init(void);
574extern void __raise_softirq_irqoff(unsigned int nr);
575
576extern void raise_softirq_irqoff(unsigned int nr);
577extern void raise_softirq(unsigned int nr);
578
579DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
580
581static inline struct task_struct *this_cpu_ksoftirqd(void)
582{
583 return this_cpu_read(ksoftirqd);
584}
585
586/* Tasklets --- multithreaded analogue of BHs.
587
588 This API is deprecated. Please consider using threaded IRQs instead:
589 https://lore.kernel.org/lkml/20200716081538.2sivhkj4hcyrusem@linutronix.de
590
591 Main feature differing them of generic softirqs: tasklet
592 is running only on one CPU simultaneously.
593
594 Main feature differing them of BHs: different tasklets
595 may be run simultaneously on different CPUs.
596
597 Properties:
598 * If tasklet_schedule() is called, then tasklet is guaranteed
599 to be executed on some cpu at least once after this.
600 * If the tasklet is already scheduled, but its execution is still not
601 started, it will be executed only once.
602 * If this tasklet is already running on another CPU (or schedule is called
603 from tasklet itself), it is rescheduled for later.
604 * Tasklet is strictly serialized wrt itself, but not
605 wrt another tasklets. If client needs some intertask synchronization,
606 he makes it with spinlocks.
607 */
608
609struct tasklet_struct
610{
611 struct tasklet_struct *next;
612 unsigned long state;
613 atomic_t count;
614 bool use_callback;
615 union {
616 void (*func)(unsigned long data);
617 void (*callback)(struct tasklet_struct *t);
618 };
619 unsigned long data;
620};
621
622#define DECLARE_TASKLET(name, _callback) \
623struct tasklet_struct name = { \
624 .count = ATOMIC_INIT(0), \
625 .callback = _callback, \
626 .use_callback = true, \
627}
628
629#define DECLARE_TASKLET_DISABLED(name, _callback) \
630struct tasklet_struct name = { \
631 .count = ATOMIC_INIT(1), \
632 .callback = _callback, \
633 .use_callback = true, \
634}
635
636#define from_tasklet(var, callback_tasklet, tasklet_fieldname) \
637 container_of(callback_tasklet, typeof(*var), tasklet_fieldname)
638
639#define DECLARE_TASKLET_OLD(name, _func) \
640struct tasklet_struct name = { \
641 .count = ATOMIC_INIT(0), \
642 .func = _func, \
643}
644
645#define DECLARE_TASKLET_DISABLED_OLD(name, _func) \
646struct tasklet_struct name = { \
647 .count = ATOMIC_INIT(1), \
648 .func = _func, \
649}
650
651enum
652{
653 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
654 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
655};
656
657#ifdef CONFIG_SMP
658static inline int tasklet_trylock(struct tasklet_struct *t)
659{
660 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
661}
662
663static inline void tasklet_unlock(struct tasklet_struct *t)
664{
665 smp_mb__before_atomic();
666 clear_bit(TASKLET_STATE_RUN, &(t)->state);
667}
668
669static inline void tasklet_unlock_wait(struct tasklet_struct *t)
670{
671 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
672}
673#else
674#define tasklet_trylock(t) 1
675#define tasklet_unlock_wait(t) do { } while (0)
676#define tasklet_unlock(t) do { } while (0)
677#endif
678
679extern void __tasklet_schedule(struct tasklet_struct *t);
680
681static inline void tasklet_schedule(struct tasklet_struct *t)
682{
683 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
684 __tasklet_schedule(t);
685}
686
687extern void __tasklet_hi_schedule(struct tasklet_struct *t);
688
689static inline void tasklet_hi_schedule(struct tasklet_struct *t)
690{
691 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
692 __tasklet_hi_schedule(t);
693}
694
695static inline void tasklet_disable_nosync(struct tasklet_struct *t)
696{
697 atomic_inc(&t->count);
698 smp_mb__after_atomic();
699}
700
701static inline void tasklet_disable(struct tasklet_struct *t)
702{
703 tasklet_disable_nosync(t);
704 tasklet_unlock_wait(t);
705 smp_mb();
706}
707
708static inline void tasklet_enable(struct tasklet_struct *t)
709{
710 smp_mb__before_atomic();
711 atomic_dec(&t->count);
712}
713
714extern void tasklet_kill(struct tasklet_struct *t);
715extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
716extern void tasklet_init(struct tasklet_struct *t,
717 void (*func)(unsigned long), unsigned long data);
718extern void tasklet_setup(struct tasklet_struct *t,
719 void (*callback)(struct tasklet_struct *));
720
721/*
722 * Autoprobing for irqs:
723 *
724 * probe_irq_on() and probe_irq_off() provide robust primitives
725 * for accurate IRQ probing during kernel initialization. They are
726 * reasonably simple to use, are not "fooled" by spurious interrupts,
727 * and, unlike other attempts at IRQ probing, they do not get hung on
728 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
729 *
730 * For reasonably foolproof probing, use them as follows:
731 *
732 * 1. clear and/or mask the device's internal interrupt.
733 * 2. sti();
734 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
735 * 4. enable the device and cause it to trigger an interrupt.
736 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
737 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
738 * 7. service the device to clear its pending interrupt.
739 * 8. loop again if paranoia is required.
740 *
741 * probe_irq_on() returns a mask of allocated irq's.
742 *
743 * probe_irq_off() takes the mask as a parameter,
744 * and returns the irq number which occurred,
745 * or zero if none occurred, or a negative irq number
746 * if more than one irq occurred.
747 */
748
749#if !defined(CONFIG_GENERIC_IRQ_PROBE)
750static inline unsigned long probe_irq_on(void)
751{
752 return 0;
753}
754static inline int probe_irq_off(unsigned long val)
755{
756 return 0;
757}
758static inline unsigned int probe_irq_mask(unsigned long val)
759{
760 return 0;
761}
762#else
763extern unsigned long probe_irq_on(void); /* returns 0 on failure */
764extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
765extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
766#endif
767
768#ifdef CONFIG_PROC_FS
769/* Initialize /proc/irq/ */
770extern void init_irq_proc(void);
771#else
772static inline void init_irq_proc(void)
773{
774}
775#endif
776
777#ifdef CONFIG_IRQ_TIMINGS
778void irq_timings_enable(void);
779void irq_timings_disable(void);
780u64 irq_timings_next_event(u64 now);
781#endif
782
783struct seq_file;
784int show_interrupts(struct seq_file *p, void *v);
785int arch_show_interrupts(struct seq_file *p, int prec);
786
787extern int early_irq_init(void);
788extern int arch_probe_nr_irqs(void);
789extern int arch_early_irq_init(void);
790
791/*
792 * We want to know which function is an entrypoint of a hardirq or a softirq.
793 */
794#ifndef __irq_entry
795# define __irq_entry __attribute__((__section__(".irqentry.text")))
796#endif
797
798#define __softirq_entry __attribute__((__section__(".softirqentry.text")))
799
800#endif
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_SAMPLE_RANDOM - irq is used to feed the random generator
46 * IRQF_SHARED - allow sharing the irq among several devices
47 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
48 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
49 * IRQF_PERCPU - Interrupt is per cpu
50 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
51 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
52 * registered first in an shared interrupt is considered for
53 * performance reasons)
54 * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
55 * Used by threaded interrupts which need to keep the
56 * irq line disabled until the threaded handler has been run.
57 * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend
58 * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
59 * IRQF_NO_THREAD - Interrupt cannot be threaded
60 * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
61 * resume time.
62 */
63#define IRQF_DISABLED 0x00000020
64#define IRQF_SAMPLE_RANDOM 0x00000040
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
77#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
78
79/*
80 * These values can be returned by request_any_context_irq() and
81 * describe the context the interrupt will be run in.
82 *
83 * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
84 * IRQC_IS_NESTED - interrupt runs in a nested threaded context
85 */
86enum {
87 IRQC_IS_HARDIRQ = 0,
88 IRQC_IS_NESTED,
89};
90
91typedef irqreturn_t (*irq_handler_t)(int, void *);
92
93/**
94 * struct irqaction - per interrupt action descriptor
95 * @handler: interrupt handler function
96 * @name: name of the device
97 * @dev_id: cookie to identify the device
98 * @percpu_dev_id: cookie to identify the device
99 * @next: pointer to the next irqaction for shared interrupts
100 * @irq: interrupt number
101 * @flags: flags (see IRQF_* above)
102 * @thread_fn: interrupt handler function for threaded interrupts
103 * @thread: thread pointer for threaded interrupts
104 * @thread_flags: flags related to @thread
105 * @thread_mask: bitmask for keeping track of @thread activity
106 * @dir: pointer to the proc/irq/NN/name entry
107 */
108struct irqaction {
109 irq_handler_t handler;
110 void *dev_id;
111 void __percpu *percpu_dev_id;
112 struct irqaction *next;
113 irq_handler_t thread_fn;
114 struct task_struct *thread;
115 unsigned int irq;
116 unsigned int flags;
117 unsigned long thread_flags;
118 unsigned long thread_mask;
119 const char *name;
120 struct proc_dir_entry *dir;
121} ____cacheline_internodealigned_in_smp;
122
123extern irqreturn_t no_action(int cpl, void *dev_id);
124
125#ifdef CONFIG_GENERIC_HARDIRQS
126extern int __must_check
127request_threaded_irq(unsigned int irq, irq_handler_t handler,
128 irq_handler_t thread_fn,
129 unsigned long flags, const char *name, void *dev);
130
131static inline int __must_check
132request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
133 const char *name, void *dev)
134{
135 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
136}
137
138extern int __must_check
139request_any_context_irq(unsigned int irq, irq_handler_t handler,
140 unsigned long flags, const char *name, void *dev_id);
141
142extern int __must_check
143request_percpu_irq(unsigned int irq, irq_handler_t handler,
144 const char *devname, void __percpu *percpu_dev_id);
145#else
146
147extern int __must_check
148request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
149 const char *name, void *dev);
150
151/*
152 * Special function to avoid ifdeffery in kernel/irq/devres.c which
153 * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
154 * m68k). I really love these $@%#!* obvious Makefile references:
155 * ../../../kernel/irq/devres.o
156 */
157static inline int __must_check
158request_threaded_irq(unsigned int irq, irq_handler_t handler,
159 irq_handler_t thread_fn,
160 unsigned long flags, const char *name, void *dev)
161{
162 return request_irq(irq, handler, flags, name, dev);
163}
164
165static inline int __must_check
166request_any_context_irq(unsigned int irq, irq_handler_t handler,
167 unsigned long flags, const char *name, void *dev_id)
168{
169 return request_irq(irq, handler, flags, name, dev_id);
170}
171
172static inline int __must_check
173request_percpu_irq(unsigned int irq, irq_handler_t handler,
174 const char *devname, void __percpu *percpu_dev_id)
175{
176 return request_irq(irq, handler, 0, devname, percpu_dev_id);
177}
178#endif
179
180extern void free_irq(unsigned int, void *);
181extern void free_percpu_irq(unsigned int, void __percpu *);
182
183struct device;
184
185extern int __must_check
186devm_request_threaded_irq(struct device *dev, unsigned int irq,
187 irq_handler_t handler, irq_handler_t thread_fn,
188 unsigned long irqflags, const char *devname,
189 void *dev_id);
190
191static inline int __must_check
192devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
193 unsigned long irqflags, const char *devname, void *dev_id)
194{
195 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
196 devname, dev_id);
197}
198
199extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
200
201/*
202 * On lockdep we dont want to enable hardirqs in hardirq
203 * context. Use local_irq_enable_in_hardirq() to annotate
204 * kernel code that has to do this nevertheless (pretty much
205 * the only valid case is for old/broken hardware that is
206 * insanely slow).
207 *
208 * NOTE: in theory this might break fragile code that relies
209 * on hardirq delivery - in practice we dont seem to have such
210 * places left. So the only effect should be slightly increased
211 * irqs-off latencies.
212 */
213#ifdef CONFIG_LOCKDEP
214# define local_irq_enable_in_hardirq() do { } while (0)
215#else
216# define local_irq_enable_in_hardirq() local_irq_enable()
217#endif
218
219extern void disable_irq_nosync(unsigned int irq);
220extern void disable_irq(unsigned int irq);
221extern void disable_percpu_irq(unsigned int irq);
222extern void enable_irq(unsigned int irq);
223extern void enable_percpu_irq(unsigned int irq, unsigned int type);
224
225/* The following three functions are for the core kernel use only. */
226#ifdef CONFIG_GENERIC_HARDIRQS
227extern void suspend_device_irqs(void);
228extern void resume_device_irqs(void);
229#ifdef CONFIG_PM_SLEEP
230extern int check_wakeup_irqs(void);
231#else
232static inline int check_wakeup_irqs(void) { return 0; }
233#endif
234#else
235static inline void suspend_device_irqs(void) { };
236static inline void resume_device_irqs(void) { };
237static inline int check_wakeup_irqs(void) { return 0; }
238#endif
239
240#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
241
242extern cpumask_var_t irq_default_affinity;
243
244extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
245extern int irq_can_set_affinity(unsigned int irq);
246extern int irq_select_affinity(unsigned int irq);
247
248extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
249
250/**
251 * struct irq_affinity_notify - context for notification of IRQ affinity changes
252 * @irq: Interrupt to which notification applies
253 * @kref: Reference count, for internal use
254 * @work: Work item, for internal use
255 * @notify: Function to be called on change. This will be
256 * called in process context.
257 * @release: Function to be called on release. This will be
258 * called in process context. Once registered, the
259 * structure must only be freed when this function is
260 * called or later.
261 */
262struct irq_affinity_notify {
263 unsigned int irq;
264 struct kref kref;
265 struct work_struct work;
266 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
267 void (*release)(struct kref *ref);
268};
269
270extern int
271irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
272
273static inline void irq_run_affinity_notifiers(void)
274{
275 flush_scheduled_work();
276}
277
278#else /* CONFIG_SMP */
279
280static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
281{
282 return -EINVAL;
283}
284
285static inline int irq_can_set_affinity(unsigned int irq)
286{
287 return 0;
288}
289
290static inline int irq_select_affinity(unsigned int irq) { return 0; }
291
292static inline int irq_set_affinity_hint(unsigned int irq,
293 const struct cpumask *m)
294{
295 return -EINVAL;
296}
297#endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
298
299#ifdef CONFIG_GENERIC_HARDIRQS
300/*
301 * Special lockdep variants of irq disabling/enabling.
302 * These should be used for locking constructs that
303 * know that a particular irq context which is disabled,
304 * and which is the only irq-context user of a lock,
305 * that it's safe to take the lock in the irq-disabled
306 * section without disabling hardirqs.
307 *
308 * On !CONFIG_LOCKDEP they are equivalent to the normal
309 * irq disable/enable methods.
310 */
311static inline void disable_irq_nosync_lockdep(unsigned int irq)
312{
313 disable_irq_nosync(irq);
314#ifdef CONFIG_LOCKDEP
315 local_irq_disable();
316#endif
317}
318
319static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
320{
321 disable_irq_nosync(irq);
322#ifdef CONFIG_LOCKDEP
323 local_irq_save(*flags);
324#endif
325}
326
327static inline void disable_irq_lockdep(unsigned int irq)
328{
329 disable_irq(irq);
330#ifdef CONFIG_LOCKDEP
331 local_irq_disable();
332#endif
333}
334
335static inline void enable_irq_lockdep(unsigned int irq)
336{
337#ifdef CONFIG_LOCKDEP
338 local_irq_enable();
339#endif
340 enable_irq(irq);
341}
342
343static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
344{
345#ifdef CONFIG_LOCKDEP
346 local_irq_restore(*flags);
347#endif
348 enable_irq(irq);
349}
350
351/* IRQ wakeup (PM) control: */
352extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
353
354static inline int enable_irq_wake(unsigned int irq)
355{
356 return irq_set_irq_wake(irq, 1);
357}
358
359static inline int disable_irq_wake(unsigned int irq)
360{
361 return irq_set_irq_wake(irq, 0);
362}
363
364#else /* !CONFIG_GENERIC_HARDIRQS */
365/*
366 * NOTE: non-genirq architectures, if they want to support the lock
367 * validator need to define the methods below in their asm/irq.h
368 * files, under an #ifdef CONFIG_LOCKDEP section.
369 */
370#ifndef CONFIG_LOCKDEP
371# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
372# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
373 disable_irq_nosync(irq)
374# define disable_irq_lockdep(irq) disable_irq(irq)
375# define enable_irq_lockdep(irq) enable_irq(irq)
376# define enable_irq_lockdep_irqrestore(irq, flags) \
377 enable_irq(irq)
378# endif
379
380static inline int enable_irq_wake(unsigned int irq)
381{
382 return 0;
383}
384
385static inline int disable_irq_wake(unsigned int irq)
386{
387 return 0;
388}
389#endif /* CONFIG_GENERIC_HARDIRQS */
390
391
392#ifdef CONFIG_IRQ_FORCED_THREADING
393extern bool force_irqthreads;
394#else
395#define force_irqthreads (0)
396#endif
397
398#ifndef __ARCH_SET_SOFTIRQ_PENDING
399#define set_softirq_pending(x) (local_softirq_pending() = (x))
400#define or_softirq_pending(x) (local_softirq_pending() |= (x))
401#endif
402
403/* Some architectures might implement lazy enabling/disabling of
404 * interrupts. In some cases, such as stop_machine, we might want
405 * to ensure that after a local_irq_disable(), interrupts have
406 * really been disabled in hardware. Such architectures need to
407 * implement the following hook.
408 */
409#ifndef hard_irq_disable
410#define hard_irq_disable() do { } while(0)
411#endif
412
413/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
414 frequency threaded job scheduling. For almost all the purposes
415 tasklets are more than enough. F.e. all serial device BHs et
416 al. should be converted to tasklets, not to softirqs.
417 */
418
419enum
420{
421 HI_SOFTIRQ=0,
422 TIMER_SOFTIRQ,
423 NET_TX_SOFTIRQ,
424 NET_RX_SOFTIRQ,
425 BLOCK_SOFTIRQ,
426 BLOCK_IOPOLL_SOFTIRQ,
427 TASKLET_SOFTIRQ,
428 SCHED_SOFTIRQ,
429 HRTIMER_SOFTIRQ,
430 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
431
432 NR_SOFTIRQS
433};
434
435/* map softirq index to softirq name. update 'softirq_to_name' in
436 * kernel/softirq.c when adding a new softirq.
437 */
438extern char *softirq_to_name[NR_SOFTIRQS];
439
440/* softirq mask and active fields moved to irq_cpustat_t in
441 * asm/hardirq.h to get better cache usage. KAO
442 */
443
444struct softirq_action
445{
446 void (*action)(struct softirq_action *);
447};
448
449asmlinkage void do_softirq(void);
450asmlinkage void __do_softirq(void);
451extern void open_softirq(int nr, void (*action)(struct softirq_action *));
452extern void softirq_init(void);
453extern void __raise_softirq_irqoff(unsigned int nr);
454
455extern void raise_softirq_irqoff(unsigned int nr);
456extern void raise_softirq(unsigned int nr);
457
458/* This is the worklist that queues up per-cpu softirq work.
459 *
460 * send_remote_sendirq() adds work to these lists, and
461 * the softirq handler itself dequeues from them. The queues
462 * are protected by disabling local cpu interrupts and they must
463 * only be accessed by the local cpu that they are for.
464 */
465DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
466
467DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
468
469static inline struct task_struct *this_cpu_ksoftirqd(void)
470{
471 return this_cpu_read(ksoftirqd);
472}
473
474/* Try to send a softirq to a remote cpu. If this cannot be done, the
475 * work will be queued to the local cpu.
476 */
477extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
478
479/* Like send_remote_softirq(), but the caller must disable local cpu interrupts
480 * and compute the current cpu, passed in as 'this_cpu'.
481 */
482extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
483 int this_cpu, int softirq);
484
485/* Tasklets --- multithreaded analogue of BHs.
486
487 Main feature differing them of generic softirqs: tasklet
488 is running only on one CPU simultaneously.
489
490 Main feature differing them of BHs: different tasklets
491 may be run simultaneously on different CPUs.
492
493 Properties:
494 * If tasklet_schedule() is called, then tasklet is guaranteed
495 to be executed on some cpu at least once after this.
496 * If the tasklet is already scheduled, but its execution is still not
497 started, it will be executed only once.
498 * If this tasklet is already running on another CPU (or schedule is called
499 from tasklet itself), it is rescheduled for later.
500 * Tasklet is strictly serialized wrt itself, but not
501 wrt another tasklets. If client needs some intertask synchronization,
502 he makes it with spinlocks.
503 */
504
505struct tasklet_struct
506{
507 struct tasklet_struct *next;
508 unsigned long state;
509 atomic_t count;
510 void (*func)(unsigned long);
511 unsigned long data;
512};
513
514#define DECLARE_TASKLET(name, func, data) \
515struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
516
517#define DECLARE_TASKLET_DISABLED(name, func, data) \
518struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
519
520
521enum
522{
523 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
524 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
525};
526
527#ifdef CONFIG_SMP
528static inline int tasklet_trylock(struct tasklet_struct *t)
529{
530 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
531}
532
533static inline void tasklet_unlock(struct tasklet_struct *t)
534{
535 smp_mb__before_clear_bit();
536 clear_bit(TASKLET_STATE_RUN, &(t)->state);
537}
538
539static inline void tasklet_unlock_wait(struct tasklet_struct *t)
540{
541 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
542}
543#else
544#define tasklet_trylock(t) 1
545#define tasklet_unlock_wait(t) do { } while (0)
546#define tasklet_unlock(t) do { } while (0)
547#endif
548
549extern void __tasklet_schedule(struct tasklet_struct *t);
550
551static inline void tasklet_schedule(struct tasklet_struct *t)
552{
553 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
554 __tasklet_schedule(t);
555}
556
557extern void __tasklet_hi_schedule(struct tasklet_struct *t);
558
559static inline void tasklet_hi_schedule(struct tasklet_struct *t)
560{
561 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
562 __tasklet_hi_schedule(t);
563}
564
565extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
566
567/*
568 * This version avoids touching any other tasklets. Needed for kmemcheck
569 * in order not to take any page faults while enqueueing this tasklet;
570 * consider VERY carefully whether you really need this or
571 * tasklet_hi_schedule()...
572 */
573static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
574{
575 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
576 __tasklet_hi_schedule_first(t);
577}
578
579
580static inline void tasklet_disable_nosync(struct tasklet_struct *t)
581{
582 atomic_inc(&t->count);
583 smp_mb__after_atomic_inc();
584}
585
586static inline void tasklet_disable(struct tasklet_struct *t)
587{
588 tasklet_disable_nosync(t);
589 tasklet_unlock_wait(t);
590 smp_mb();
591}
592
593static inline void tasklet_enable(struct tasklet_struct *t)
594{
595 smp_mb__before_atomic_dec();
596 atomic_dec(&t->count);
597}
598
599static inline void tasklet_hi_enable(struct tasklet_struct *t)
600{
601 smp_mb__before_atomic_dec();
602 atomic_dec(&t->count);
603}
604
605extern void tasklet_kill(struct tasklet_struct *t);
606extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
607extern void tasklet_init(struct tasklet_struct *t,
608 void (*func)(unsigned long), unsigned long data);
609
610struct tasklet_hrtimer {
611 struct hrtimer timer;
612 struct tasklet_struct tasklet;
613 enum hrtimer_restart (*function)(struct hrtimer *);
614};
615
616extern void
617tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
618 enum hrtimer_restart (*function)(struct hrtimer *),
619 clockid_t which_clock, enum hrtimer_mode mode);
620
621static inline
622int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
623 const enum hrtimer_mode mode)
624{
625 return hrtimer_start(&ttimer->timer, time, mode);
626}
627
628static inline
629void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
630{
631 hrtimer_cancel(&ttimer->timer);
632 tasklet_kill(&ttimer->tasklet);
633}
634
635/*
636 * Autoprobing for irqs:
637 *
638 * probe_irq_on() and probe_irq_off() provide robust primitives
639 * for accurate IRQ probing during kernel initialization. They are
640 * reasonably simple to use, are not "fooled" by spurious interrupts,
641 * and, unlike other attempts at IRQ probing, they do not get hung on
642 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
643 *
644 * For reasonably foolproof probing, use them as follows:
645 *
646 * 1. clear and/or mask the device's internal interrupt.
647 * 2. sti();
648 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
649 * 4. enable the device and cause it to trigger an interrupt.
650 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
651 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
652 * 7. service the device to clear its pending interrupt.
653 * 8. loop again if paranoia is required.
654 *
655 * probe_irq_on() returns a mask of allocated irq's.
656 *
657 * probe_irq_off() takes the mask as a parameter,
658 * and returns the irq number which occurred,
659 * or zero if none occurred, or a negative irq number
660 * if more than one irq occurred.
661 */
662
663#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
664static inline unsigned long probe_irq_on(void)
665{
666 return 0;
667}
668static inline int probe_irq_off(unsigned long val)
669{
670 return 0;
671}
672static inline unsigned int probe_irq_mask(unsigned long val)
673{
674 return 0;
675}
676#else
677extern unsigned long probe_irq_on(void); /* returns 0 on failure */
678extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
679extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
680#endif
681
682#ifdef CONFIG_PROC_FS
683/* Initialize /proc/irq/ */
684extern void init_irq_proc(void);
685#else
686static inline void init_irq_proc(void)
687{
688}
689#endif
690
691struct seq_file;
692int show_interrupts(struct seq_file *p, void *v);
693int arch_show_interrupts(struct seq_file *p, int prec);
694
695extern int early_irq_init(void);
696extern int arch_probe_nr_irqs(void);
697extern int arch_early_irq_init(void);
698
699#endif