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>
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)
53 #define IRQF_DISABLED 0x00000020
54 #define IRQF_SAMPLE_RANDOM 0x00000040
55 #define IRQF_SHARED 0x00000080
56 #define IRQF_PROBE_SHARED 0x00000100
57 #define IRQF_TIMER 0x00000200
58 #define IRQF_PERCPU 0x00000400
59 #define IRQF_NOBALANCING 0x00000800
60 #define IRQF_IRQPOLL 0x00001000
63 * Bits used by threaded handlers:
64 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
65 * IRQTF_DIED - handler thread died
72 typedef irqreturn_t (*irq_handler_t)(int, void *);
75 * struct irqaction - per interrupt action descriptor
76 * @handler: interrupt handler function
77 * @flags: flags (see IRQF_* above)
78 * @mask: no comment as it is useless and about to be removed
79 * @name: name of the device
80 * @dev_id: cookie to identify the device
81 * @next: pointer to the next irqaction for shared interrupts
82 * @irq: interrupt number
83 * @dir: pointer to the proc/irq/NN/name entry
84 * @thread_fn: interupt handler function for threaded interrupts
85 * @thread: thread pointer for threaded interrupts
86 * @thread_flags: flags related to @thread
89 irq_handler_t handler;
94 struct irqaction *next;
96 struct proc_dir_entry *dir;
97 irq_handler_t thread_fn;
98 struct task_struct *thread;
99 unsigned long thread_flags;
102 extern irqreturn_t no_action(int cpl, void *dev_id);
104 extern int __must_check
105 request_threaded_irq(unsigned int irq, irq_handler_t handler,
106 irq_handler_t thread_fn,
107 unsigned long flags, const char *name, void *dev);
109 static inline int __must_check
110 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
111 const char *name, void *dev)
113 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
116 #ifdef CONFIG_GENERIC_HARDIRQS
117 extern void exit_irq_thread(void);
119 static inline void exit_irq_thread(void) { }
122 extern void free_irq(unsigned int, void *);
126 extern int __must_check
127 devm_request_threaded_irq(struct device *dev, unsigned int irq,
128 irq_handler_t handler, irq_handler_t thread_fn,
129 unsigned long irqflags, const char *devname,
132 static inline int __must_check
133 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
134 unsigned long irqflags, const char *devname, void *dev_id)
136 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
140 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
143 * On lockdep we dont want to enable hardirqs in hardirq
144 * context. Use local_irq_enable_in_hardirq() to annotate
145 * kernel code that has to do this nevertheless (pretty much
146 * the only valid case is for old/broken hardware that is
149 * NOTE: in theory this might break fragile code that relies
150 * on hardirq delivery - in practice we dont seem to have such
151 * places left. So the only effect should be slightly increased
152 * irqs-off latencies.
154 #ifdef CONFIG_LOCKDEP
155 # define local_irq_enable_in_hardirq() do { } while (0)
157 # define local_irq_enable_in_hardirq() local_irq_enable()
160 extern void disable_irq_nosync(unsigned int irq);
161 extern void disable_irq(unsigned int irq);
162 extern void enable_irq(unsigned int irq);
164 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
166 extern cpumask_var_t irq_default_affinity;
168 extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
169 extern int irq_can_set_affinity(unsigned int irq);
170 extern int irq_select_affinity(unsigned int irq);
172 #else /* CONFIG_SMP */
174 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
179 static inline int irq_can_set_affinity(unsigned int irq)
184 static inline int irq_select_affinity(unsigned int irq) { return 0; }
186 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
188 #ifdef CONFIG_GENERIC_HARDIRQS
190 * Special lockdep variants of irq disabling/enabling.
191 * These should be used for locking constructs that
192 * know that a particular irq context which is disabled,
193 * and which is the only irq-context user of a lock,
194 * that it's safe to take the lock in the irq-disabled
195 * section without disabling hardirqs.
197 * On !CONFIG_LOCKDEP they are equivalent to the normal
198 * irq disable/enable methods.
200 static inline void disable_irq_nosync_lockdep(unsigned int irq)
202 disable_irq_nosync(irq);
203 #ifdef CONFIG_LOCKDEP
208 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
210 disable_irq_nosync(irq);
211 #ifdef CONFIG_LOCKDEP
212 local_irq_save(*flags);
216 static inline void disable_irq_lockdep(unsigned int irq)
219 #ifdef CONFIG_LOCKDEP
224 static inline void enable_irq_lockdep(unsigned int irq)
226 #ifdef CONFIG_LOCKDEP
232 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
234 #ifdef CONFIG_LOCKDEP
235 local_irq_restore(*flags);
240 /* IRQ wakeup (PM) control: */
241 extern int set_irq_wake(unsigned int irq, unsigned int on);
243 static inline int enable_irq_wake(unsigned int irq)
245 return set_irq_wake(irq, 1);
248 static inline int disable_irq_wake(unsigned int irq)
250 return set_irq_wake(irq, 0);
253 #else /* !CONFIG_GENERIC_HARDIRQS */
255 * NOTE: non-genirq architectures, if they want to support the lock
256 * validator need to define the methods below in their asm/irq.h
257 * files, under an #ifdef CONFIG_LOCKDEP section.
259 #ifndef CONFIG_LOCKDEP
260 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
261 # define disable_irq_nosync_lockdep_irqsave(irq, flags) \
262 disable_irq_nosync(irq)
263 # define disable_irq_lockdep(irq) disable_irq(irq)
264 # define enable_irq_lockdep(irq) enable_irq(irq)
265 # define enable_irq_lockdep_irqrestore(irq, flags) \
269 static inline int enable_irq_wake(unsigned int irq)
274 static inline int disable_irq_wake(unsigned int irq)
278 #endif /* CONFIG_GENERIC_HARDIRQS */
280 #ifndef __ARCH_SET_SOFTIRQ_PENDING
281 #define set_softirq_pending(x) (local_softirq_pending() = (x))
282 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
285 /* Some architectures might implement lazy enabling/disabling of
286 * interrupts. In some cases, such as stop_machine, we might want
287 * to ensure that after a local_irq_disable(), interrupts have
288 * really been disabled in hardware. Such architectures need to
289 * implement the following hook.
291 #ifndef hard_irq_disable
292 #define hard_irq_disable() do { } while(0)
295 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
296 frequency threaded job scheduling. For almost all the purposes
297 tasklets are more than enough. F.e. all serial device BHs et
298 al. should be converted to tasklets, not to softirqs.
311 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
316 /* softirq mask and active fields moved to irq_cpustat_t in
317 * asm/hardirq.h to get better cache usage. KAO
320 struct softirq_action
322 void (*action)(struct softirq_action *);
325 asmlinkage void do_softirq(void);
326 asmlinkage void __do_softirq(void);
327 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
328 extern void softirq_init(void);
329 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
330 extern void raise_softirq_irqoff(unsigned int nr);
331 extern void raise_softirq(unsigned int nr);
333 /* This is the worklist that queues up per-cpu softirq work.
335 * send_remote_sendirq() adds work to these lists, and
336 * the softirq handler itself dequeues from them. The queues
337 * are protected by disabling local cpu interrupts and they must
338 * only be accessed by the local cpu that they are for.
340 DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
342 /* Try to send a softirq to a remote cpu. If this cannot be done, the
343 * work will be queued to the local cpu.
345 extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
347 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
348 * and compute the current cpu, passed in as 'this_cpu'.
350 extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
351 int this_cpu, int softirq);
353 /* Tasklets --- multithreaded analogue of BHs.
355 Main feature differing them of generic softirqs: tasklet
356 is running only on one CPU simultaneously.
358 Main feature differing them of BHs: different tasklets
359 may be run simultaneously on different CPUs.
362 * If tasklet_schedule() is called, then tasklet is guaranteed
363 to be executed on some cpu at least once after this.
364 * If the tasklet is already scheduled, but its excecution is still not
365 started, it will be executed only once.
366 * If this tasklet is already running on another CPU (or schedule is called
367 from tasklet itself), it is rescheduled for later.
368 * Tasklet is strictly serialized wrt itself, but not
369 wrt another tasklets. If client needs some intertask synchronization,
370 he makes it with spinlocks.
373 struct tasklet_struct
375 struct tasklet_struct *next;
378 void (*func)(unsigned long);
382 #define DECLARE_TASKLET(name, func, data) \
383 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
385 #define DECLARE_TASKLET_DISABLED(name, func, data) \
386 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
391 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
392 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
396 static inline int tasklet_trylock(struct tasklet_struct *t)
398 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
401 static inline void tasklet_unlock(struct tasklet_struct *t)
403 smp_mb__before_clear_bit();
404 clear_bit(TASKLET_STATE_RUN, &(t)->state);
407 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
409 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
412 #define tasklet_trylock(t) 1
413 #define tasklet_unlock_wait(t) do { } while (0)
414 #define tasklet_unlock(t) do { } while (0)
417 extern void __tasklet_schedule(struct tasklet_struct *t);
419 static inline void tasklet_schedule(struct tasklet_struct *t)
421 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
422 __tasklet_schedule(t);
425 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
427 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
429 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
430 __tasklet_hi_schedule(t);
434 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
436 atomic_inc(&t->count);
437 smp_mb__after_atomic_inc();
440 static inline void tasklet_disable(struct tasklet_struct *t)
442 tasklet_disable_nosync(t);
443 tasklet_unlock_wait(t);
447 static inline void tasklet_enable(struct tasklet_struct *t)
449 smp_mb__before_atomic_dec();
450 atomic_dec(&t->count);
453 static inline void tasklet_hi_enable(struct tasklet_struct *t)
455 smp_mb__before_atomic_dec();
456 atomic_dec(&t->count);
459 extern void tasklet_kill(struct tasklet_struct *t);
460 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
461 extern void tasklet_init(struct tasklet_struct *t,
462 void (*func)(unsigned long), unsigned long data);
465 * Autoprobing for irqs:
467 * probe_irq_on() and probe_irq_off() provide robust primitives
468 * for accurate IRQ probing during kernel initialization. They are
469 * reasonably simple to use, are not "fooled" by spurious interrupts,
470 * and, unlike other attempts at IRQ probing, they do not get hung on
471 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
473 * For reasonably foolproof probing, use them as follows:
475 * 1. clear and/or mask the device's internal interrupt.
477 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
478 * 4. enable the device and cause it to trigger an interrupt.
479 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
480 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
481 * 7. service the device to clear its pending interrupt.
482 * 8. loop again if paranoia is required.
484 * probe_irq_on() returns a mask of allocated irq's.
486 * probe_irq_off() takes the mask as a parameter,
487 * and returns the irq number which occurred,
488 * or zero if none occurred, or a negative irq number
489 * if more than one irq occurred.
492 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
493 static inline unsigned long probe_irq_on(void)
497 static inline int probe_irq_off(unsigned long val)
501 static inline unsigned int probe_irq_mask(unsigned long val)
506 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
507 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
508 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
511 #ifdef CONFIG_PROC_FS
512 /* Initialize /proc/irq/ */
513 extern void init_irq_proc(void);
515 static inline void init_irq_proc(void)
520 #if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ)
521 extern void debug_poll_all_shared_irqs(void);
523 static inline void debug_poll_all_shared_irqs(void) { }
526 int show_interrupts(struct seq_file *p, void *v);
530 extern int early_irq_init(void);
531 extern int arch_probe_nr_irqs(void);
532 extern int arch_early_irq_init(void);
533 extern int arch_init_chip_data(struct irq_desc *desc, int cpu);