2 #ifndef _LINUX_INTERRUPT_H
3 #define _LINUX_INTERRUPT_H
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>
18 #include <asm/atomic.h>
19 #include <asm/ptrace.h>
20 #include <asm/system.h>
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.
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
39 * These flags used only by the kernel as part of the
40 * irq handling routines.
42 * IRQF_DISABLED - keep irqs disabled when calling the action handler
43 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
44 * IRQF_SHARED - allow sharing the irq among several devices
45 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
46 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
47 * IRQF_PERCPU - Interrupt is per cpu
48 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
49 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
50 * registered first in an shared interrupt is considered for
51 * performance reasons)
52 * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
53 * Used by threaded interrupts which need to keep the
54 * irq line disabled until the threaded handler has been run.
56 #define IRQF_DISABLED 0x00000020
57 #define IRQF_SAMPLE_RANDOM 0x00000040
58 #define IRQF_SHARED 0x00000080
59 #define IRQF_PROBE_SHARED 0x00000100
60 #define IRQF_TIMER 0x00000200
61 #define IRQF_PERCPU 0x00000400
62 #define IRQF_NOBALANCING 0x00000800
63 #define IRQF_IRQPOLL 0x00001000
64 #define IRQF_ONESHOT 0x00002000
67 * Bits used by threaded handlers:
68 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
69 * IRQTF_DIED - handler thread died
70 * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
71 * IRQTF_AFFINITY - irq thread is requested to adjust affinity
81 * These values can be returned by request_any_context_irq() and
82 * describe the context the interrupt will be run in.
84 * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
85 * IRQC_IS_NESTED - interrupt runs in a nested threaded context
92 typedef irqreturn_t (*irq_handler_t
)(int, void *);
95 * struct irqaction - per interrupt action descriptor
96 * @handler: interrupt handler function
97 * @flags: flags (see IRQF_* above)
98 * @name: name of the device
99 * @dev_id: cookie to identify the device
100 * @next: pointer to the next irqaction for shared interrupts
101 * @irq: interrupt number
102 * @dir: pointer to the proc/irq/NN/name entry
103 * @thread_fn: interupt handler function for threaded interrupts
104 * @thread: thread pointer for threaded interrupts
105 * @thread_flags: flags related to @thread
108 irq_handler_t handler
;
112 struct irqaction
*next
;
114 struct proc_dir_entry
*dir
;
115 irq_handler_t thread_fn
;
116 struct task_struct
*thread
;
117 unsigned long thread_flags
;
120 extern irqreturn_t
no_action(int cpl
, void *dev_id
);
122 #ifdef CONFIG_GENERIC_HARDIRQS
123 extern int __must_check
124 request_threaded_irq(unsigned int irq
, irq_handler_t handler
,
125 irq_handler_t thread_fn
,
126 unsigned long flags
, const char *name
, void *dev
);
128 static inline int __must_check
129 request_irq(unsigned int irq
, irq_handler_t handler
, unsigned long flags
,
130 const char *name
, void *dev
)
132 return request_threaded_irq(irq
, handler
, NULL
, flags
, name
, dev
);
135 extern int __must_check
136 request_any_context_irq(unsigned int irq
, irq_handler_t handler
,
137 unsigned long flags
, const char *name
, void *dev_id
);
139 extern void exit_irq_thread(void);
142 extern int __must_check
143 request_irq(unsigned int irq
, irq_handler_t handler
, unsigned long flags
,
144 const char *name
, void *dev
);
147 * Special function to avoid ifdeffery in kernel/irq/devres.c which
148 * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
149 * m68k). I really love these $@%#!* obvious Makefile references:
150 * ../../../kernel/irq/devres.o
152 static inline int __must_check
153 request_threaded_irq(unsigned int irq
, irq_handler_t handler
,
154 irq_handler_t thread_fn
,
155 unsigned long flags
, const char *name
, void *dev
)
157 return request_irq(irq
, handler
, flags
, name
, dev
);
160 static inline int __must_check
161 request_any_context_irq(unsigned int irq
, irq_handler_t handler
,
162 unsigned long flags
, const char *name
, void *dev_id
)
164 return request_irq(irq
, handler
, flags
, name
, dev_id
);
167 static inline void exit_irq_thread(void) { }
170 extern void free_irq(unsigned int, void *);
174 extern int __must_check
175 devm_request_threaded_irq(struct device
*dev
, unsigned int irq
,
176 irq_handler_t handler
, irq_handler_t thread_fn
,
177 unsigned long irqflags
, const char *devname
,
180 static inline int __must_check
181 devm_request_irq(struct device
*dev
, unsigned int irq
, irq_handler_t handler
,
182 unsigned long irqflags
, const char *devname
, void *dev_id
)
184 return devm_request_threaded_irq(dev
, irq
, handler
, NULL
, irqflags
,
188 extern void devm_free_irq(struct device
*dev
, unsigned int irq
, void *dev_id
);
191 * On lockdep we dont want to enable hardirqs in hardirq
192 * context. Use local_irq_enable_in_hardirq() to annotate
193 * kernel code that has to do this nevertheless (pretty much
194 * the only valid case is for old/broken hardware that is
197 * NOTE: in theory this might break fragile code that relies
198 * on hardirq delivery - in practice we dont seem to have such
199 * places left. So the only effect should be slightly increased
200 * irqs-off latencies.
202 #ifdef CONFIG_LOCKDEP
203 # define local_irq_enable_in_hardirq() do { } while (0)
205 # define local_irq_enable_in_hardirq() local_irq_enable()
208 extern void disable_irq_nosync(unsigned int irq
);
209 extern void disable_irq(unsigned int irq
);
210 extern void enable_irq(unsigned int irq
);
212 /* The following three functions are for the core kernel use only. */
213 #ifdef CONFIG_GENERIC_HARDIRQS
214 extern void suspend_device_irqs(void);
215 extern void resume_device_irqs(void);
216 #ifdef CONFIG_PM_SLEEP
217 extern int check_wakeup_irqs(void);
219 static inline int check_wakeup_irqs(void) { return 0; }
222 static inline void suspend_device_irqs(void) { };
223 static inline void resume_device_irqs(void) { };
224 static inline int check_wakeup_irqs(void) { return 0; }
227 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
229 extern cpumask_var_t irq_default_affinity
;
231 extern int irq_set_affinity(unsigned int irq
, const struct cpumask
*cpumask
);
232 extern int irq_can_set_affinity(unsigned int irq
);
233 extern int irq_select_affinity(unsigned int irq
);
235 #else /* CONFIG_SMP */
237 static inline int irq_set_affinity(unsigned int irq
, const struct cpumask
*m
)
242 static inline int irq_can_set_affinity(unsigned int irq
)
247 static inline int irq_select_affinity(unsigned int irq
) { return 0; }
249 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
251 #ifdef CONFIG_GENERIC_HARDIRQS
253 * Special lockdep variants of irq disabling/enabling.
254 * These should be used for locking constructs that
255 * know that a particular irq context which is disabled,
256 * and which is the only irq-context user of a lock,
257 * that it's safe to take the lock in the irq-disabled
258 * section without disabling hardirqs.
260 * On !CONFIG_LOCKDEP they are equivalent to the normal
261 * irq disable/enable methods.
263 static inline void disable_irq_nosync_lockdep(unsigned int irq
)
265 disable_irq_nosync(irq
);
266 #ifdef CONFIG_LOCKDEP
271 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq
, unsigned long *flags
)
273 disable_irq_nosync(irq
);
274 #ifdef CONFIG_LOCKDEP
275 local_irq_save(*flags
);
279 static inline void disable_irq_lockdep(unsigned int irq
)
282 #ifdef CONFIG_LOCKDEP
287 static inline void enable_irq_lockdep(unsigned int irq
)
289 #ifdef CONFIG_LOCKDEP
295 static inline void enable_irq_lockdep_irqrestore(unsigned int irq
, unsigned long *flags
)
297 #ifdef CONFIG_LOCKDEP
298 local_irq_restore(*flags
);
303 /* IRQ wakeup (PM) control: */
304 extern int set_irq_wake(unsigned int irq
, unsigned int on
);
306 static inline int enable_irq_wake(unsigned int irq
)
308 return set_irq_wake(irq
, 1);
311 static inline int disable_irq_wake(unsigned int irq
)
313 return set_irq_wake(irq
, 0);
316 #else /* !CONFIG_GENERIC_HARDIRQS */
318 * NOTE: non-genirq architectures, if they want to support the lock
319 * validator need to define the methods below in their asm/irq.h
320 * files, under an #ifdef CONFIG_LOCKDEP section.
322 #ifndef CONFIG_LOCKDEP
323 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
324 # define disable_irq_nosync_lockdep_irqsave(irq, flags) \
325 disable_irq_nosync(irq)
326 # define disable_irq_lockdep(irq) disable_irq(irq)
327 # define enable_irq_lockdep(irq) enable_irq(irq)
328 # define enable_irq_lockdep_irqrestore(irq, flags) \
332 static inline int enable_irq_wake(unsigned int irq
)
337 static inline int disable_irq_wake(unsigned int irq
)
341 #endif /* CONFIG_GENERIC_HARDIRQS */
343 #ifndef __ARCH_SET_SOFTIRQ_PENDING
344 #define set_softirq_pending(x) (local_softirq_pending() = (x))
345 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
348 /* Some architectures might implement lazy enabling/disabling of
349 * interrupts. In some cases, such as stop_machine, we might want
350 * to ensure that after a local_irq_disable(), interrupts have
351 * really been disabled in hardware. Such architectures need to
352 * implement the following hook.
354 #ifndef hard_irq_disable
355 #define hard_irq_disable() do { } while(0)
358 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
359 frequency threaded job scheduling. For almost all the purposes
360 tasklets are more than enough. F.e. all serial device BHs et
361 al. should be converted to tasklets, not to softirqs.
371 BLOCK_IOPOLL_SOFTIRQ
,
375 RCU_SOFTIRQ
, /* Preferable RCU should always be the last softirq */
380 /* map softirq index to softirq name. update 'softirq_to_name' in
381 * kernel/softirq.c when adding a new softirq.
383 extern char *softirq_to_name
[NR_SOFTIRQS
];
385 /* softirq mask and active fields moved to irq_cpustat_t in
386 * asm/hardirq.h to get better cache usage. KAO
389 struct softirq_action
391 void (*action
)(struct softirq_action
*);
394 asmlinkage
void do_softirq(void);
395 asmlinkage
void __do_softirq(void);
396 extern void open_softirq(int nr
, void (*action
)(struct softirq_action
*));
397 extern void softirq_init(void);
398 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
399 extern void raise_softirq_irqoff(unsigned int nr
);
400 extern void raise_softirq(unsigned int nr
);
401 extern void wakeup_softirqd(void);
403 /* This is the worklist that queues up per-cpu softirq work.
405 * send_remote_sendirq() adds work to these lists, and
406 * the softirq handler itself dequeues from them. The queues
407 * are protected by disabling local cpu interrupts and they must
408 * only be accessed by the local cpu that they are for.
410 DECLARE_PER_CPU(struct list_head
[NR_SOFTIRQS
], softirq_work_list
);
412 /* Try to send a softirq to a remote cpu. If this cannot be done, the
413 * work will be queued to the local cpu.
415 extern void send_remote_softirq(struct call_single_data
*cp
, int cpu
, int softirq
);
417 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
418 * and compute the current cpu, passed in as 'this_cpu'.
420 extern void __send_remote_softirq(struct call_single_data
*cp
, int cpu
,
421 int this_cpu
, int softirq
);
423 /* Tasklets --- multithreaded analogue of BHs.
425 Main feature differing them of generic softirqs: tasklet
426 is running only on one CPU simultaneously.
428 Main feature differing them of BHs: different tasklets
429 may be run simultaneously on different CPUs.
432 * If tasklet_schedule() is called, then tasklet is guaranteed
433 to be executed on some cpu at least once after this.
434 * If the tasklet is already scheduled, but its excecution is still not
435 started, it will be executed only once.
436 * If this tasklet is already running on another CPU (or schedule is called
437 from tasklet itself), it is rescheduled for later.
438 * Tasklet is strictly serialized wrt itself, but not
439 wrt another tasklets. If client needs some intertask synchronization,
440 he makes it with spinlocks.
443 struct tasklet_struct
445 struct tasklet_struct
*next
;
448 void (*func
)(unsigned long);
452 #define DECLARE_TASKLET(name, func, data) \
453 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
455 #define DECLARE_TASKLET_DISABLED(name, func, data) \
456 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
461 TASKLET_STATE_SCHED
, /* Tasklet is scheduled for execution */
462 TASKLET_STATE_RUN
/* Tasklet is running (SMP only) */
466 static inline int tasklet_trylock(struct tasklet_struct
*t
)
468 return !test_and_set_bit(TASKLET_STATE_RUN
, &(t
)->state
);
471 static inline void tasklet_unlock(struct tasklet_struct
*t
)
473 smp_mb__before_clear_bit();
474 clear_bit(TASKLET_STATE_RUN
, &(t
)->state
);
477 static inline void tasklet_unlock_wait(struct tasklet_struct
*t
)
479 while (test_bit(TASKLET_STATE_RUN
, &(t
)->state
)) { barrier(); }
482 #define tasklet_trylock(t) 1
483 #define tasklet_unlock_wait(t) do { } while (0)
484 #define tasklet_unlock(t) do { } while (0)
487 extern void __tasklet_schedule(struct tasklet_struct
*t
);
489 static inline void tasklet_schedule(struct tasklet_struct
*t
)
491 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
492 __tasklet_schedule(t
);
495 extern void __tasklet_hi_schedule(struct tasklet_struct
*t
);
497 static inline void tasklet_hi_schedule(struct tasklet_struct
*t
)
499 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
500 __tasklet_hi_schedule(t
);
503 extern void __tasklet_hi_schedule_first(struct tasklet_struct
*t
);
506 * This version avoids touching any other tasklets. Needed for kmemcheck
507 * in order not to take any page faults while enqueueing this tasklet;
508 * consider VERY carefully whether you really need this or
509 * tasklet_hi_schedule()...
511 static inline void tasklet_hi_schedule_first(struct tasklet_struct
*t
)
513 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
514 __tasklet_hi_schedule_first(t
);
518 static inline void tasklet_disable_nosync(struct tasklet_struct
*t
)
520 atomic_inc(&t
->count
);
521 smp_mb__after_atomic_inc();
524 static inline void tasklet_disable(struct tasklet_struct
*t
)
526 tasklet_disable_nosync(t
);
527 tasklet_unlock_wait(t
);
531 static inline void tasklet_enable(struct tasklet_struct
*t
)
533 smp_mb__before_atomic_dec();
534 atomic_dec(&t
->count
);
537 static inline void tasklet_hi_enable(struct tasklet_struct
*t
)
539 smp_mb__before_atomic_dec();
540 atomic_dec(&t
->count
);
543 extern void tasklet_kill(struct tasklet_struct
*t
);
544 extern void tasklet_kill_immediate(struct tasklet_struct
*t
, unsigned int cpu
);
545 extern void tasklet_init(struct tasklet_struct
*t
,
546 void (*func
)(unsigned long), unsigned long data
);
548 struct tasklet_hrtimer
{
549 struct hrtimer timer
;
550 struct tasklet_struct tasklet
;
551 enum hrtimer_restart (*function
)(struct hrtimer
*);
555 tasklet_hrtimer_init(struct tasklet_hrtimer
*ttimer
,
556 enum hrtimer_restart (*function
)(struct hrtimer
*),
557 clockid_t which_clock
, enum hrtimer_mode mode
);
560 int tasklet_hrtimer_start(struct tasklet_hrtimer
*ttimer
, ktime_t time
,
561 const enum hrtimer_mode mode
)
563 return hrtimer_start(&ttimer
->timer
, time
, mode
);
567 void tasklet_hrtimer_cancel(struct tasklet_hrtimer
*ttimer
)
569 hrtimer_cancel(&ttimer
->timer
);
570 tasklet_kill(&ttimer
->tasklet
);
574 * Autoprobing for irqs:
576 * probe_irq_on() and probe_irq_off() provide robust primitives
577 * for accurate IRQ probing during kernel initialization. They are
578 * reasonably simple to use, are not "fooled" by spurious interrupts,
579 * and, unlike other attempts at IRQ probing, they do not get hung on
580 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
582 * For reasonably foolproof probing, use them as follows:
584 * 1. clear and/or mask the device's internal interrupt.
586 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
587 * 4. enable the device and cause it to trigger an interrupt.
588 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
589 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
590 * 7. service the device to clear its pending interrupt.
591 * 8. loop again if paranoia is required.
593 * probe_irq_on() returns a mask of allocated irq's.
595 * probe_irq_off() takes the mask as a parameter,
596 * and returns the irq number which occurred,
597 * or zero if none occurred, or a negative irq number
598 * if more than one irq occurred.
601 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
602 static inline unsigned long probe_irq_on(void)
606 static inline int probe_irq_off(unsigned long val
)
610 static inline unsigned int probe_irq_mask(unsigned long val
)
615 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
616 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
617 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
620 #ifdef CONFIG_PROC_FS
621 /* Initialize /proc/irq/ */
622 extern void init_irq_proc(void);
624 static inline void init_irq_proc(void)
630 int show_interrupts(struct seq_file
*p
, void *v
);
634 extern int early_irq_init(void);
635 extern int arch_probe_nr_irqs(void);
636 extern int arch_early_irq_init(void);
637 extern int arch_init_chip_data(struct irq_desc
*desc
, int node
);