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
80 typedef irqreturn_t (*irq_handler_t)(int, void *);
83 * struct irqaction - per interrupt action descriptor
84 * @handler: interrupt handler function
85 * @flags: flags (see IRQF_* above)
86 * @name: name of the device
87 * @dev_id: cookie to identify the device
88 * @next: pointer to the next irqaction for shared interrupts
89 * @irq: interrupt number
90 * @dir: pointer to the proc/irq/NN/name entry
91 * @thread_fn: interupt handler function for threaded interrupts
92 * @thread: thread pointer for threaded interrupts
93 * @thread_flags: flags related to @thread
96 irq_handler_t handler;
100 struct irqaction *next;
102 struct proc_dir_entry *dir;
103 irq_handler_t thread_fn;
104 struct task_struct *thread;
105 unsigned long thread_flags;
108 extern irqreturn_t no_action(int cpl, void *dev_id);
110 #ifdef CONFIG_GENERIC_HARDIRQS
111 extern int __must_check
112 request_threaded_irq(unsigned int irq, irq_handler_t handler,
113 irq_handler_t thread_fn,
114 unsigned long flags, const char *name, void *dev);
116 static inline int __must_check
117 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
118 const char *name, void *dev)
120 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
123 extern void exit_irq_thread(void);
126 extern int __must_check
127 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
128 const char *name, void *dev);
131 * Special function to avoid ifdeffery in kernel/irq/devres.c which
132 * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
133 * m68k). I really love these $@%#!* obvious Makefile references:
134 * ../../../kernel/irq/devres.o
136 static inline int __must_check
137 request_threaded_irq(unsigned int irq, irq_handler_t handler,
138 irq_handler_t thread_fn,
139 unsigned long flags, const char *name, void *dev)
141 return request_irq(irq, handler, flags, name, dev);
144 static inline void exit_irq_thread(void) { }
147 extern void free_irq(unsigned int, void *);
151 extern int __must_check
152 devm_request_threaded_irq(struct device *dev, unsigned int irq,
153 irq_handler_t handler, irq_handler_t thread_fn,
154 unsigned long irqflags, const char *devname,
157 static inline int __must_check
158 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
159 unsigned long irqflags, const char *devname, void *dev_id)
161 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
165 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
168 * On lockdep we dont want to enable hardirqs in hardirq
169 * context. Use local_irq_enable_in_hardirq() to annotate
170 * kernel code that has to do this nevertheless (pretty much
171 * the only valid case is for old/broken hardware that is
174 * NOTE: in theory this might break fragile code that relies
175 * on hardirq delivery - in practice we dont seem to have such
176 * places left. So the only effect should be slightly increased
177 * irqs-off latencies.
179 #ifdef CONFIG_LOCKDEP
180 # define local_irq_enable_in_hardirq() do { } while (0)
182 # define local_irq_enable_in_hardirq() local_irq_enable()
185 extern void disable_irq_nosync(unsigned int irq);
186 extern void disable_irq(unsigned int irq);
187 extern void enable_irq(unsigned int irq);
189 /* The following three functions are for the core kernel use only. */
190 #ifdef CONFIG_GENERIC_HARDIRQS
191 extern void suspend_device_irqs(void);
192 extern void resume_device_irqs(void);
193 #ifdef CONFIG_PM_SLEEP
194 extern int check_wakeup_irqs(void);
196 static inline int check_wakeup_irqs(void) { return 0; }
199 static inline void suspend_device_irqs(void) { };
200 static inline void resume_device_irqs(void) { };
201 static inline int check_wakeup_irqs(void) { return 0; }
204 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
206 extern cpumask_var_t irq_default_affinity;
208 extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
209 extern int irq_can_set_affinity(unsigned int irq);
210 extern int irq_select_affinity(unsigned int irq);
212 #else /* CONFIG_SMP */
214 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
219 static inline int irq_can_set_affinity(unsigned int irq)
224 static inline int irq_select_affinity(unsigned int irq) { return 0; }
226 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
228 #ifdef CONFIG_GENERIC_HARDIRQS
230 * Special lockdep variants of irq disabling/enabling.
231 * These should be used for locking constructs that
232 * know that a particular irq context which is disabled,
233 * and which is the only irq-context user of a lock,
234 * that it's safe to take the lock in the irq-disabled
235 * section without disabling hardirqs.
237 * On !CONFIG_LOCKDEP they are equivalent to the normal
238 * irq disable/enable methods.
240 static inline void disable_irq_nosync_lockdep(unsigned int irq)
242 disable_irq_nosync(irq);
243 #ifdef CONFIG_LOCKDEP
248 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
250 disable_irq_nosync(irq);
251 #ifdef CONFIG_LOCKDEP
252 local_irq_save(*flags);
256 static inline void disable_irq_lockdep(unsigned int irq)
259 #ifdef CONFIG_LOCKDEP
264 static inline void enable_irq_lockdep(unsigned int irq)
266 #ifdef CONFIG_LOCKDEP
272 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
274 #ifdef CONFIG_LOCKDEP
275 local_irq_restore(*flags);
280 /* IRQ wakeup (PM) control: */
281 extern int set_irq_wake(unsigned int irq, unsigned int on);
283 static inline int enable_irq_wake(unsigned int irq)
285 return set_irq_wake(irq, 1);
288 static inline int disable_irq_wake(unsigned int irq)
290 return set_irq_wake(irq, 0);
293 #else /* !CONFIG_GENERIC_HARDIRQS */
295 * NOTE: non-genirq architectures, if they want to support the lock
296 * validator need to define the methods below in their asm/irq.h
297 * files, under an #ifdef CONFIG_LOCKDEP section.
299 #ifndef CONFIG_LOCKDEP
300 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
301 # define disable_irq_nosync_lockdep_irqsave(irq, flags) \
302 disable_irq_nosync(irq)
303 # define disable_irq_lockdep(irq) disable_irq(irq)
304 # define enable_irq_lockdep(irq) enable_irq(irq)
305 # define enable_irq_lockdep_irqrestore(irq, flags) \
309 static inline int enable_irq_wake(unsigned int irq)
314 static inline int disable_irq_wake(unsigned int irq)
318 #endif /* CONFIG_GENERIC_HARDIRQS */
320 #ifndef __ARCH_SET_SOFTIRQ_PENDING
321 #define set_softirq_pending(x) (local_softirq_pending() = (x))
322 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
325 /* Some architectures might implement lazy enabling/disabling of
326 * interrupts. In some cases, such as stop_machine, we might want
327 * to ensure that after a local_irq_disable(), interrupts have
328 * really been disabled in hardware. Such architectures need to
329 * implement the following hook.
331 #ifndef hard_irq_disable
332 #define hard_irq_disable() do { } while(0)
335 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
336 frequency threaded job scheduling. For almost all the purposes
337 tasklets are more than enough. F.e. all serial device BHs et
338 al. should be converted to tasklets, not to softirqs.
348 BLOCK_IOPOLL_SOFTIRQ,
352 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
357 /* map softirq index to softirq name. update 'softirq_to_name' in
358 * kernel/softirq.c when adding a new softirq.
360 extern char *softirq_to_name[NR_SOFTIRQS];
362 /* softirq mask and active fields moved to irq_cpustat_t in
363 * asm/hardirq.h to get better cache usage. KAO
366 struct softirq_action
368 void (*action)(struct softirq_action *);
371 asmlinkage void do_softirq(void);
372 asmlinkage void __do_softirq(void);
373 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
374 extern void softirq_init(void);
375 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
376 extern void raise_softirq_irqoff(unsigned int nr);
377 extern void raise_softirq(unsigned int nr);
378 extern void wakeup_softirqd(void);
380 /* This is the worklist that queues up per-cpu softirq work.
382 * send_remote_sendirq() adds work to these lists, and
383 * the softirq handler itself dequeues from them. The queues
384 * are protected by disabling local cpu interrupts and they must
385 * only be accessed by the local cpu that they are for.
387 DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
389 /* Try to send a softirq to a remote cpu. If this cannot be done, the
390 * work will be queued to the local cpu.
392 extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
394 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
395 * and compute the current cpu, passed in as 'this_cpu'.
397 extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
398 int this_cpu, int softirq);
400 /* Tasklets --- multithreaded analogue of BHs.
402 Main feature differing them of generic softirqs: tasklet
403 is running only on one CPU simultaneously.
405 Main feature differing them of BHs: different tasklets
406 may be run simultaneously on different CPUs.
409 * If tasklet_schedule() is called, then tasklet is guaranteed
410 to be executed on some cpu at least once after this.
411 * If the tasklet is already scheduled, but its excecution is still not
412 started, it will be executed only once.
413 * If this tasklet is already running on another CPU (or schedule is called
414 from tasklet itself), it is rescheduled for later.
415 * Tasklet is strictly serialized wrt itself, but not
416 wrt another tasklets. If client needs some intertask synchronization,
417 he makes it with spinlocks.
420 struct tasklet_struct
422 struct tasklet_struct *next;
425 void (*func)(unsigned long);
429 #define DECLARE_TASKLET(name, func, data) \
430 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
432 #define DECLARE_TASKLET_DISABLED(name, func, data) \
433 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
438 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
439 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
443 static inline int tasklet_trylock(struct tasklet_struct *t)
445 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
448 static inline void tasklet_unlock(struct tasklet_struct *t)
450 smp_mb__before_clear_bit();
451 clear_bit(TASKLET_STATE_RUN, &(t)->state);
454 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
456 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
459 #define tasklet_trylock(t) 1
460 #define tasklet_unlock_wait(t) do { } while (0)
461 #define tasklet_unlock(t) do { } while (0)
464 extern void __tasklet_schedule(struct tasklet_struct *t);
466 static inline void tasklet_schedule(struct tasklet_struct *t)
468 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
469 __tasklet_schedule(t);
472 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
474 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
476 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
477 __tasklet_hi_schedule(t);
480 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
483 * This version avoids touching any other tasklets. Needed for kmemcheck
484 * in order not to take any page faults while enqueueing this tasklet;
485 * consider VERY carefully whether you really need this or
486 * tasklet_hi_schedule()...
488 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
490 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
491 __tasklet_hi_schedule_first(t);
495 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
497 atomic_inc(&t->count);
498 smp_mb__after_atomic_inc();
501 static inline void tasklet_disable(struct tasklet_struct *t)
503 tasklet_disable_nosync(t);
504 tasklet_unlock_wait(t);
508 static inline void tasklet_enable(struct tasklet_struct *t)
510 smp_mb__before_atomic_dec();
511 atomic_dec(&t->count);
514 static inline void tasklet_hi_enable(struct tasklet_struct *t)
516 smp_mb__before_atomic_dec();
517 atomic_dec(&t->count);
520 extern void tasklet_kill(struct tasklet_struct *t);
521 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
522 extern void tasklet_init(struct tasklet_struct *t,
523 void (*func)(unsigned long), unsigned long data);
525 struct tasklet_hrtimer {
526 struct hrtimer timer;
527 struct tasklet_struct tasklet;
528 enum hrtimer_restart (*function)(struct hrtimer *);
532 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
533 enum hrtimer_restart (*function)(struct hrtimer *),
534 clockid_t which_clock, enum hrtimer_mode mode);
537 int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
538 const enum hrtimer_mode mode)
540 return hrtimer_start(&ttimer->timer, time, mode);
544 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
546 hrtimer_cancel(&ttimer->timer);
547 tasklet_kill(&ttimer->tasklet);
551 * Autoprobing for irqs:
553 * probe_irq_on() and probe_irq_off() provide robust primitives
554 * for accurate IRQ probing during kernel initialization. They are
555 * reasonably simple to use, are not "fooled" by spurious interrupts,
556 * and, unlike other attempts at IRQ probing, they do not get hung on
557 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
559 * For reasonably foolproof probing, use them as follows:
561 * 1. clear and/or mask the device's internal interrupt.
563 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
564 * 4. enable the device and cause it to trigger an interrupt.
565 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
566 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
567 * 7. service the device to clear its pending interrupt.
568 * 8. loop again if paranoia is required.
570 * probe_irq_on() returns a mask of allocated irq's.
572 * probe_irq_off() takes the mask as a parameter,
573 * and returns the irq number which occurred,
574 * or zero if none occurred, or a negative irq number
575 * if more than one irq occurred.
578 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
579 static inline unsigned long probe_irq_on(void)
583 static inline int probe_irq_off(unsigned long val)
587 static inline unsigned int probe_irq_mask(unsigned long val)
592 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
593 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
594 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
597 #ifdef CONFIG_PROC_FS
598 /* Initialize /proc/irq/ */
599 extern void init_irq_proc(void);
601 static inline void init_irq_proc(void)
607 int show_interrupts(struct seq_file *p, void *v);
611 extern int early_irq_init(void);
612 extern int arch_probe_nr_irqs(void);
613 extern int arch_early_irq_init(void);
614 extern int arch_init_chip_data(struct irq_desc *desc, int node);