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/sched.h>
14 #include <linux/irqflags.h>
15 #include <linux/smp.h>
16 #include <linux/percpu.h>
17 #include <linux/hrtimer.h>
19 #include <asm/atomic.h>
20 #include <asm/ptrace.h>
21 #include <asm/system.h>
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.
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
40 * These flags used only by the kernel as part of the
41 * irq handling routines.
43 * IRQF_DISABLED - keep irqs disabled when calling the action handler
44 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
45 * IRQF_SHARED - allow sharing the irq among several devices
46 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
47 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
48 * IRQF_PERCPU - Interrupt is per cpu
49 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
50 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
51 * registered first in an shared interrupt is considered for
52 * performance reasons)
54 #define IRQF_DISABLED 0x00000020
55 #define IRQF_SAMPLE_RANDOM 0x00000040
56 #define IRQF_SHARED 0x00000080
57 #define IRQF_PROBE_SHARED 0x00000100
58 #define IRQF_TIMER 0x00000200
59 #define IRQF_PERCPU 0x00000400
60 #define IRQF_NOBALANCING 0x00000800
61 #define IRQF_IRQPOLL 0x00001000
64 * Bits used by threaded handlers:
65 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
66 * IRQTF_DIED - handler thread died
67 * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
75 typedef irqreturn_t (*irq_handler_t
)(int, void *);
78 * struct irqaction - per interrupt action descriptor
79 * @handler: interrupt handler function
80 * @flags: flags (see IRQF_* above)
81 * @mask: no comment as it is useless and about to be removed
82 * @name: name of the device
83 * @dev_id: cookie to identify the device
84 * @next: pointer to the next irqaction for shared interrupts
85 * @irq: interrupt number
86 * @dir: pointer to the proc/irq/NN/name entry
87 * @thread_fn: interupt handler function for threaded interrupts
88 * @thread: thread pointer for threaded interrupts
89 * @thread_flags: flags related to @thread
92 irq_handler_t handler
;
97 struct irqaction
*next
;
99 struct proc_dir_entry
*dir
;
100 irq_handler_t thread_fn
;
101 struct task_struct
*thread
;
102 unsigned long thread_flags
;
105 extern irqreturn_t
no_action(int cpl
, void *dev_id
);
107 #ifdef CONFIG_GENERIC_HARDIRQS
108 extern int __must_check
109 request_threaded_irq(unsigned int irq
, irq_handler_t handler
,
110 irq_handler_t thread_fn
,
111 unsigned long flags
, const char *name
, void *dev
);
113 static inline int __must_check
114 request_irq(unsigned int irq
, irq_handler_t handler
, unsigned long flags
,
115 const char *name
, void *dev
)
117 return request_threaded_irq(irq
, handler
, NULL
, flags
, name
, dev
);
120 extern void exit_irq_thread(void);
123 extern int __must_check
124 request_irq(unsigned int irq
, irq_handler_t handler
, unsigned long flags
,
125 const char *name
, void *dev
);
128 * Special function to avoid ifdeffery in kernel/irq/devres.c which
129 * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
130 * m68k). I really love these $@%#!* obvious Makefile references:
131 * ../../../kernel/irq/devres.o
133 static inline int __must_check
134 request_threaded_irq(unsigned int irq
, irq_handler_t handler
,
135 irq_handler_t thread_fn
,
136 unsigned long flags
, const char *name
, void *dev
)
138 return request_irq(irq
, handler
, flags
, name
, dev
);
141 static inline void exit_irq_thread(void) { }
144 extern void free_irq(unsigned int, void *);
148 extern int __must_check
149 devm_request_threaded_irq(struct device
*dev
, unsigned int irq
,
150 irq_handler_t handler
, irq_handler_t thread_fn
,
151 unsigned long irqflags
, const char *devname
,
154 static inline int __must_check
155 devm_request_irq(struct device
*dev
, unsigned int irq
, irq_handler_t handler
,
156 unsigned long irqflags
, const char *devname
, void *dev_id
)
158 return devm_request_threaded_irq(dev
, irq
, handler
, NULL
, irqflags
,
162 extern void devm_free_irq(struct device
*dev
, unsigned int irq
, void *dev_id
);
165 * On lockdep we dont want to enable hardirqs in hardirq
166 * context. Use local_irq_enable_in_hardirq() to annotate
167 * kernel code that has to do this nevertheless (pretty much
168 * the only valid case is for old/broken hardware that is
171 * NOTE: in theory this might break fragile code that relies
172 * on hardirq delivery - in practice we dont seem to have such
173 * places left. So the only effect should be slightly increased
174 * irqs-off latencies.
176 #ifdef CONFIG_LOCKDEP
177 # define local_irq_enable_in_hardirq() do { } while (0)
179 # define local_irq_enable_in_hardirq() local_irq_enable()
182 extern void disable_irq_nosync(unsigned int irq
);
183 extern void disable_irq(unsigned int irq
);
184 extern void enable_irq(unsigned int irq
);
186 /* The following three functions are for the core kernel use only. */
187 #ifdef CONFIG_GENERIC_HARDIRQS
188 extern void suspend_device_irqs(void);
189 extern void resume_device_irqs(void);
190 #ifdef CONFIG_PM_SLEEP
191 extern int check_wakeup_irqs(void);
193 static inline int check_wakeup_irqs(void) { return 0; }
196 static inline void suspend_device_irqs(void) { };
197 static inline void resume_device_irqs(void) { };
198 static inline int check_wakeup_irqs(void) { return 0; }
201 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
203 extern cpumask_var_t irq_default_affinity
;
205 extern int irq_set_affinity(unsigned int irq
, const struct cpumask
*cpumask
);
206 extern int irq_can_set_affinity(unsigned int irq
);
207 extern int irq_select_affinity(unsigned int irq
);
209 #else /* CONFIG_SMP */
211 static inline int irq_set_affinity(unsigned int irq
, const struct cpumask
*m
)
216 static inline int irq_can_set_affinity(unsigned int irq
)
221 static inline int irq_select_affinity(unsigned int irq
) { return 0; }
223 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
225 #ifdef CONFIG_GENERIC_HARDIRQS
227 * Special lockdep variants of irq disabling/enabling.
228 * These should be used for locking constructs that
229 * know that a particular irq context which is disabled,
230 * and which is the only irq-context user of a lock,
231 * that it's safe to take the lock in the irq-disabled
232 * section without disabling hardirqs.
234 * On !CONFIG_LOCKDEP they are equivalent to the normal
235 * irq disable/enable methods.
237 static inline void disable_irq_nosync_lockdep(unsigned int irq
)
239 disable_irq_nosync(irq
);
240 #ifdef CONFIG_LOCKDEP
245 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq
, unsigned long *flags
)
247 disable_irq_nosync(irq
);
248 #ifdef CONFIG_LOCKDEP
249 local_irq_save(*flags
);
253 static inline void disable_irq_lockdep(unsigned int irq
)
256 #ifdef CONFIG_LOCKDEP
261 static inline void enable_irq_lockdep(unsigned int irq
)
263 #ifdef CONFIG_LOCKDEP
269 static inline void enable_irq_lockdep_irqrestore(unsigned int irq
, unsigned long *flags
)
271 #ifdef CONFIG_LOCKDEP
272 local_irq_restore(*flags
);
277 /* IRQ wakeup (PM) control: */
278 extern int set_irq_wake(unsigned int irq
, unsigned int on
);
280 static inline int enable_irq_wake(unsigned int irq
)
282 return set_irq_wake(irq
, 1);
285 static inline int disable_irq_wake(unsigned int irq
)
287 return set_irq_wake(irq
, 0);
290 #else /* !CONFIG_GENERIC_HARDIRQS */
292 * NOTE: non-genirq architectures, if they want to support the lock
293 * validator need to define the methods below in their asm/irq.h
294 * files, under an #ifdef CONFIG_LOCKDEP section.
296 #ifndef CONFIG_LOCKDEP
297 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
298 # define disable_irq_nosync_lockdep_irqsave(irq, flags) \
299 disable_irq_nosync(irq)
300 # define disable_irq_lockdep(irq) disable_irq(irq)
301 # define enable_irq_lockdep(irq) enable_irq(irq)
302 # define enable_irq_lockdep_irqrestore(irq, flags) \
306 static inline int enable_irq_wake(unsigned int irq
)
311 static inline int disable_irq_wake(unsigned int irq
)
315 #endif /* CONFIG_GENERIC_HARDIRQS */
317 #ifndef __ARCH_SET_SOFTIRQ_PENDING
318 #define set_softirq_pending(x) (local_softirq_pending() = (x))
319 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
322 /* Some architectures might implement lazy enabling/disabling of
323 * interrupts. In some cases, such as stop_machine, we might want
324 * to ensure that after a local_irq_disable(), interrupts have
325 * really been disabled in hardware. Such architectures need to
326 * implement the following hook.
328 #ifndef hard_irq_disable
329 #define hard_irq_disable() do { } while(0)
332 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
333 frequency threaded job scheduling. For almost all the purposes
334 tasklets are more than enough. F.e. all serial device BHs et
335 al. should be converted to tasklets, not to softirqs.
348 RCU_SOFTIRQ
, /* Preferable RCU should always be the last softirq */
353 /* map softirq index to softirq name. update 'softirq_to_name' in
354 * kernel/softirq.c when adding a new softirq.
356 extern char *softirq_to_name
[NR_SOFTIRQS
];
358 /* softirq mask and active fields moved to irq_cpustat_t in
359 * asm/hardirq.h to get better cache usage. KAO
362 struct softirq_action
364 void (*action
)(struct softirq_action
*);
367 asmlinkage
void do_softirq(void);
368 asmlinkage
void __do_softirq(void);
369 extern void open_softirq(int nr
, void (*action
)(struct softirq_action
*));
370 extern void softirq_init(void);
371 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
372 extern void raise_softirq_irqoff(unsigned int nr
);
373 extern void raise_softirq(unsigned int nr
);
374 extern void wakeup_softirqd(void);
376 /* This is the worklist that queues up per-cpu softirq work.
378 * send_remote_sendirq() adds work to these lists, and
379 * the softirq handler itself dequeues from them. The queues
380 * are protected by disabling local cpu interrupts and they must
381 * only be accessed by the local cpu that they are for.
383 DECLARE_PER_CPU(struct list_head
[NR_SOFTIRQS
], softirq_work_list
);
385 /* Try to send a softirq to a remote cpu. If this cannot be done, the
386 * work will be queued to the local cpu.
388 extern void send_remote_softirq(struct call_single_data
*cp
, int cpu
, int softirq
);
390 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
391 * and compute the current cpu, passed in as 'this_cpu'.
393 extern void __send_remote_softirq(struct call_single_data
*cp
, int cpu
,
394 int this_cpu
, int softirq
);
396 /* Tasklets --- multithreaded analogue of BHs.
398 Main feature differing them of generic softirqs: tasklet
399 is running only on one CPU simultaneously.
401 Main feature differing them of BHs: different tasklets
402 may be run simultaneously on different CPUs.
405 * If tasklet_schedule() is called, then tasklet is guaranteed
406 to be executed on some cpu at least once after this.
407 * If the tasklet is already scheduled, but its excecution is still not
408 started, it will be executed only once.
409 * If this tasklet is already running on another CPU (or schedule is called
410 from tasklet itself), it is rescheduled for later.
411 * Tasklet is strictly serialized wrt itself, but not
412 wrt another tasklets. If client needs some intertask synchronization,
413 he makes it with spinlocks.
416 struct tasklet_struct
418 struct tasklet_struct
*next
;
421 void (*func
)(unsigned long);
425 #define DECLARE_TASKLET(name, func, data) \
426 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
428 #define DECLARE_TASKLET_DISABLED(name, func, data) \
429 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
434 TASKLET_STATE_SCHED
, /* Tasklet is scheduled for execution */
435 TASKLET_STATE_RUN
/* Tasklet is running (SMP only) */
439 static inline int tasklet_trylock(struct tasklet_struct
*t
)
441 return !test_and_set_bit(TASKLET_STATE_RUN
, &(t
)->state
);
444 static inline void tasklet_unlock(struct tasklet_struct
*t
)
446 smp_mb__before_clear_bit();
447 clear_bit(TASKLET_STATE_RUN
, &(t
)->state
);
450 static inline void tasklet_unlock_wait(struct tasklet_struct
*t
)
452 while (test_bit(TASKLET_STATE_RUN
, &(t
)->state
)) { barrier(); }
455 #define tasklet_trylock(t) 1
456 #define tasklet_unlock_wait(t) do { } while (0)
457 #define tasklet_unlock(t) do { } while (0)
460 extern void __tasklet_schedule(struct tasklet_struct
*t
);
462 static inline void tasklet_schedule(struct tasklet_struct
*t
)
464 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
465 __tasklet_schedule(t
);
468 extern void __tasklet_hi_schedule(struct tasklet_struct
*t
);
470 static inline void tasklet_hi_schedule(struct tasklet_struct
*t
)
472 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
473 __tasklet_hi_schedule(t
);
476 extern void __tasklet_hi_schedule_first(struct tasklet_struct
*t
);
479 * This version avoids touching any other tasklets. Needed for kmemcheck
480 * in order not to take any page faults while enqueueing this tasklet;
481 * consider VERY carefully whether you really need this or
482 * tasklet_hi_schedule()...
484 static inline void tasklet_hi_schedule_first(struct tasklet_struct
*t
)
486 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
487 __tasklet_hi_schedule_first(t
);
491 static inline void tasklet_disable_nosync(struct tasklet_struct
*t
)
493 atomic_inc(&t
->count
);
494 smp_mb__after_atomic_inc();
497 static inline void tasklet_disable(struct tasklet_struct
*t
)
499 tasklet_disable_nosync(t
);
500 tasklet_unlock_wait(t
);
504 static inline void tasklet_enable(struct tasklet_struct
*t
)
506 smp_mb__before_atomic_dec();
507 atomic_dec(&t
->count
);
510 static inline void tasklet_hi_enable(struct tasklet_struct
*t
)
512 smp_mb__before_atomic_dec();
513 atomic_dec(&t
->count
);
516 extern void tasklet_kill(struct tasklet_struct
*t
);
517 extern void tasklet_kill_immediate(struct tasklet_struct
*t
, unsigned int cpu
);
518 extern void tasklet_init(struct tasklet_struct
*t
,
519 void (*func
)(unsigned long), unsigned long data
);
521 struct tasklet_hrtimer
{
522 struct hrtimer timer
;
523 struct tasklet_struct tasklet
;
524 enum hrtimer_restart (*function
)(struct hrtimer
*);
528 tasklet_hrtimer_init(struct tasklet_hrtimer
*ttimer
,
529 enum hrtimer_restart (*function
)(struct hrtimer
*),
530 clockid_t which_clock
, enum hrtimer_mode mode
);
533 int tasklet_hrtimer_start(struct tasklet_hrtimer
*ttimer
, ktime_t time
,
534 const enum hrtimer_mode mode
)
536 return hrtimer_start(&ttimer
->timer
, time
, mode
);
540 void tasklet_hrtimer_cancel(struct tasklet_hrtimer
*ttimer
)
542 hrtimer_cancel(&ttimer
->timer
);
543 tasklet_kill(&ttimer
->tasklet
);
547 * Autoprobing for irqs:
549 * probe_irq_on() and probe_irq_off() provide robust primitives
550 * for accurate IRQ probing during kernel initialization. They are
551 * reasonably simple to use, are not "fooled" by spurious interrupts,
552 * and, unlike other attempts at IRQ probing, they do not get hung on
553 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
555 * For reasonably foolproof probing, use them as follows:
557 * 1. clear and/or mask the device's internal interrupt.
559 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
560 * 4. enable the device and cause it to trigger an interrupt.
561 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
562 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
563 * 7. service the device to clear its pending interrupt.
564 * 8. loop again if paranoia is required.
566 * probe_irq_on() returns a mask of allocated irq's.
568 * probe_irq_off() takes the mask as a parameter,
569 * and returns the irq number which occurred,
570 * or zero if none occurred, or a negative irq number
571 * if more than one irq occurred.
574 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
575 static inline unsigned long probe_irq_on(void)
579 static inline int probe_irq_off(unsigned long val
)
583 static inline unsigned int probe_irq_mask(unsigned long val
)
588 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
589 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
590 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
593 #ifdef CONFIG_PROC_FS
594 /* Initialize /proc/irq/ */
595 extern void init_irq_proc(void);
597 static inline void init_irq_proc(void)
602 #if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ)
603 extern void debug_poll_all_shared_irqs(void);
605 static inline void debug_poll_all_shared_irqs(void) { }
608 int show_interrupts(struct seq_file
*p
, void *v
);
612 extern int early_irq_init(void);
613 extern int arch_probe_nr_irqs(void);
614 extern int arch_early_irq_init(void);
615 extern int arch_init_chip_data(struct irq_desc
*desc
, int node
);