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/hrtimer.h>
15 #include <linux/kref.h>
16 #include <linux/workqueue.h>
18 #include <linux/atomic.h>
19 #include <asm/ptrace.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_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 an 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.txt
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
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.
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
78 #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
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 * @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
111 irq_handler_t handler;
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;
120 unsigned long thread_flags;
121 unsigned long thread_mask;
123 struct proc_dir_entry *dir;
124 } ____cacheline_internodealigned_in_smp;
126 extern irqreturn_t no_action(int cpl, void *dev_id);
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.
133 * 0x80000000 is guaranteed to be outside the available range of interrupts
134 * and easy to distinguish from other possible incorrect values.
136 #define IRQ_NOTCONNECTED (1U << 31)
138 extern int __must_check
139 request_threaded_irq(unsigned int irq, irq_handler_t handler,
140 irq_handler_t thread_fn,
141 unsigned long flags, const char *name, void *dev);
143 static inline int __must_check
144 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
145 const char *name, void *dev)
147 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
150 extern int __must_check
151 request_any_context_irq(unsigned int irq, irq_handler_t handler,
152 unsigned long flags, const char *name, void *dev_id);
154 extern int __must_check
155 request_percpu_irq(unsigned int irq, irq_handler_t handler,
156 const char *devname, void __percpu *percpu_dev_id);
158 extern void free_irq(unsigned int, void *);
159 extern void free_percpu_irq(unsigned int, void __percpu *);
163 extern int __must_check
164 devm_request_threaded_irq(struct device *dev, unsigned int irq,
165 irq_handler_t handler, irq_handler_t thread_fn,
166 unsigned long irqflags, const char *devname,
169 static inline int __must_check
170 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
171 unsigned long irqflags, const char *devname, void *dev_id)
173 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
177 extern int __must_check
178 devm_request_any_context_irq(struct device *dev, unsigned int irq,
179 irq_handler_t handler, unsigned long irqflags,
180 const char *devname, void *dev_id);
182 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
185 * On lockdep we dont want to enable hardirqs in hardirq
186 * context. Use local_irq_enable_in_hardirq() to annotate
187 * kernel code that has to do this nevertheless (pretty much
188 * the only valid case is for old/broken hardware that is
191 * NOTE: in theory this might break fragile code that relies
192 * on hardirq delivery - in practice we dont seem to have such
193 * places left. So the only effect should be slightly increased
194 * irqs-off latencies.
196 #ifdef CONFIG_LOCKDEP
197 # define local_irq_enable_in_hardirq() do { } while (0)
199 # define local_irq_enable_in_hardirq() local_irq_enable()
202 extern void disable_irq_nosync(unsigned int irq);
203 extern bool disable_hardirq(unsigned int irq);
204 extern void disable_irq(unsigned int irq);
205 extern void disable_percpu_irq(unsigned int irq);
206 extern void enable_irq(unsigned int irq);
207 extern void enable_percpu_irq(unsigned int irq, unsigned int type);
208 extern bool irq_percpu_is_enabled(unsigned int irq);
209 extern void irq_wake_thread(unsigned int irq, void *dev_id);
211 /* The following three functions are for the core kernel use only. */
212 extern void suspend_device_irqs(void);
213 extern void resume_device_irqs(void);
216 * struct irq_affinity_notify - context for notification of IRQ affinity changes
217 * @irq: Interrupt to which notification applies
218 * @kref: Reference count, for internal use
219 * @work: Work item, for internal use
220 * @notify: Function to be called on change. This will be
221 * called in process context.
222 * @release: Function to be called on release. This will be
223 * called in process context. Once registered, the
224 * structure must only be freed when this function is
227 struct irq_affinity_notify {
230 struct work_struct work;
231 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
232 void (*release)(struct kref *ref);
235 #if defined(CONFIG_SMP)
237 extern cpumask_var_t irq_default_affinity;
239 /* Internal implementation. Use the helpers below */
240 extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
244 * irq_set_affinity - Set the irq affinity of a given irq
245 * @irq: Interrupt to set affinity
248 * Fails if cpumask does not contain an online CPU
251 irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
253 return __irq_set_affinity(irq, cpumask, false);
257 * irq_force_affinity - Force the irq affinity of a given irq
258 * @irq: Interrupt to set affinity
261 * Same as irq_set_affinity, but without checking the mask against
264 * Solely for low level cpu hotplug code, where we need to make per
265 * cpu interrupts affine before the cpu becomes online.
268 irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
270 return __irq_set_affinity(irq, cpumask, true);
273 extern int irq_can_set_affinity(unsigned int irq);
274 extern int irq_select_affinity(unsigned int irq);
276 extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
279 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
281 struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs);
283 #else /* CONFIG_SMP */
285 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
290 static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
295 static inline int irq_can_set_affinity(unsigned int irq)
300 static inline int irq_select_affinity(unsigned int irq) { return 0; }
302 static inline int irq_set_affinity_hint(unsigned int irq,
303 const struct cpumask *m)
309 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
314 static inline struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs)
319 #endif /* CONFIG_SMP */
322 * Special lockdep variants of irq disabling/enabling.
323 * These should be used for locking constructs that
324 * know that a particular irq context which is disabled,
325 * and which is the only irq-context user of a lock,
326 * that it's safe to take the lock in the irq-disabled
327 * section without disabling hardirqs.
329 * On !CONFIG_LOCKDEP they are equivalent to the normal
330 * irq disable/enable methods.
332 static inline void disable_irq_nosync_lockdep(unsigned int irq)
334 disable_irq_nosync(irq);
335 #ifdef CONFIG_LOCKDEP
340 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
342 disable_irq_nosync(irq);
343 #ifdef CONFIG_LOCKDEP
344 local_irq_save(*flags);
348 static inline void disable_irq_lockdep(unsigned int irq)
351 #ifdef CONFIG_LOCKDEP
356 static inline void enable_irq_lockdep(unsigned int irq)
358 #ifdef CONFIG_LOCKDEP
364 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
366 #ifdef CONFIG_LOCKDEP
367 local_irq_restore(*flags);
372 /* IRQ wakeup (PM) control: */
373 extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
375 static inline int enable_irq_wake(unsigned int irq)
377 return irq_set_irq_wake(irq, 1);
380 static inline int disable_irq_wake(unsigned int irq)
382 return irq_set_irq_wake(irq, 0);
386 * irq_get_irqchip_state/irq_set_irqchip_state specific flags
388 enum irqchip_irq_state {
389 IRQCHIP_STATE_PENDING, /* Is interrupt pending? */
390 IRQCHIP_STATE_ACTIVE, /* Is interrupt in progress? */
391 IRQCHIP_STATE_MASKED, /* Is interrupt masked? */
392 IRQCHIP_STATE_LINE_LEVEL, /* Is IRQ line high? */
395 extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
397 extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
400 #ifdef CONFIG_IRQ_FORCED_THREADING
401 extern bool force_irqthreads;
403 #define force_irqthreads (0)
406 #ifndef __ARCH_SET_SOFTIRQ_PENDING
407 #define set_softirq_pending(x) (local_softirq_pending() = (x))
408 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
411 /* Some architectures might implement lazy enabling/disabling of
412 * interrupts. In some cases, such as stop_machine, we might want
413 * to ensure that after a local_irq_disable(), interrupts have
414 * really been disabled in hardware. Such architectures need to
415 * implement the following hook.
417 #ifndef hard_irq_disable
418 #define hard_irq_disable() do { } while(0)
421 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
422 frequency threaded job scheduling. For almost all the purposes
423 tasklets are more than enough. F.e. all serial device BHs et
424 al. should be converted to tasklets, not to softirqs.
437 HRTIMER_SOFTIRQ, /* Unused, but kept as tools rely on the
439 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
444 #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
446 /* map softirq index to softirq name. update 'softirq_to_name' in
447 * kernel/softirq.c when adding a new softirq.
449 extern const char * const softirq_to_name[NR_SOFTIRQS];
451 /* softirq mask and active fields moved to irq_cpustat_t in
452 * asm/hardirq.h to get better cache usage. KAO
455 struct softirq_action
457 void (*action)(struct softirq_action *);
460 asmlinkage void do_softirq(void);
461 asmlinkage void __do_softirq(void);
463 #ifdef __ARCH_HAS_DO_SOFTIRQ
464 void do_softirq_own_stack(void);
466 static inline void do_softirq_own_stack(void)
472 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
473 extern void softirq_init(void);
474 extern void __raise_softirq_irqoff(unsigned int nr);
476 extern void raise_softirq_irqoff(unsigned int nr);
477 extern void raise_softirq(unsigned int nr);
479 DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
481 static inline struct task_struct *this_cpu_ksoftirqd(void)
483 return this_cpu_read(ksoftirqd);
486 /* Tasklets --- multithreaded analogue of BHs.
488 Main feature differing them of generic softirqs: tasklet
489 is running only on one CPU simultaneously.
491 Main feature differing them of BHs: different tasklets
492 may be run simultaneously on different CPUs.
495 * If tasklet_schedule() is called, then tasklet is guaranteed
496 to be executed on some cpu at least once after this.
497 * If the tasklet is already scheduled, but its execution is still not
498 started, it will be executed only once.
499 * If this tasklet is already running on another CPU (or schedule is called
500 from tasklet itself), it is rescheduled for later.
501 * Tasklet is strictly serialized wrt itself, but not
502 wrt another tasklets. If client needs some intertask synchronization,
503 he makes it with spinlocks.
506 struct tasklet_struct
508 struct tasklet_struct *next;
511 void (*func)(unsigned long);
515 #define DECLARE_TASKLET(name, func, data) \
516 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
518 #define DECLARE_TASKLET_DISABLED(name, func, data) \
519 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
524 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
525 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
529 static inline int tasklet_trylock(struct tasklet_struct *t)
531 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
534 static inline void tasklet_unlock(struct tasklet_struct *t)
536 smp_mb__before_atomic();
537 clear_bit(TASKLET_STATE_RUN, &(t)->state);
540 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
542 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
545 #define tasklet_trylock(t) 1
546 #define tasklet_unlock_wait(t) do { } while (0)
547 #define tasklet_unlock(t) do { } while (0)
550 extern void __tasklet_schedule(struct tasklet_struct *t);
552 static inline void tasklet_schedule(struct tasklet_struct *t)
554 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
555 __tasklet_schedule(t);
558 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
560 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
562 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
563 __tasklet_hi_schedule(t);
566 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
569 * This version avoids touching any other tasklets. Needed for kmemcheck
570 * in order not to take any page faults while enqueueing this tasklet;
571 * consider VERY carefully whether you really need this or
572 * tasklet_hi_schedule()...
574 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
576 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
577 __tasklet_hi_schedule_first(t);
581 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
583 atomic_inc(&t->count);
584 smp_mb__after_atomic();
587 static inline void tasklet_disable(struct tasklet_struct *t)
589 tasklet_disable_nosync(t);
590 tasklet_unlock_wait(t);
594 static inline void tasklet_enable(struct tasklet_struct *t)
596 smp_mb__before_atomic();
597 atomic_dec(&t->count);
600 extern void tasklet_kill(struct tasklet_struct *t);
601 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
602 extern void tasklet_init(struct tasklet_struct *t,
603 void (*func)(unsigned long), unsigned long data);
605 struct tasklet_hrtimer {
606 struct hrtimer timer;
607 struct tasklet_struct tasklet;
608 enum hrtimer_restart (*function)(struct hrtimer *);
612 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
613 enum hrtimer_restart (*function)(struct hrtimer *),
614 clockid_t which_clock, enum hrtimer_mode mode);
617 void tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
618 const enum hrtimer_mode mode)
620 hrtimer_start(&ttimer->timer, time, mode);
624 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
626 hrtimer_cancel(&ttimer->timer);
627 tasklet_kill(&ttimer->tasklet);
631 * Autoprobing for irqs:
633 * probe_irq_on() and probe_irq_off() provide robust primitives
634 * for accurate IRQ probing during kernel initialization. They are
635 * reasonably simple to use, are not "fooled" by spurious interrupts,
636 * and, unlike other attempts at IRQ probing, they do not get hung on
637 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
639 * For reasonably foolproof probing, use them as follows:
641 * 1. clear and/or mask the device's internal interrupt.
643 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
644 * 4. enable the device and cause it to trigger an interrupt.
645 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
646 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
647 * 7. service the device to clear its pending interrupt.
648 * 8. loop again if paranoia is required.
650 * probe_irq_on() returns a mask of allocated irq's.
652 * probe_irq_off() takes the mask as a parameter,
653 * and returns the irq number which occurred,
654 * or zero if none occurred, or a negative irq number
655 * if more than one irq occurred.
658 #if !defined(CONFIG_GENERIC_IRQ_PROBE)
659 static inline unsigned long probe_irq_on(void)
663 static inline int probe_irq_off(unsigned long val)
667 static inline unsigned int probe_irq_mask(unsigned long val)
672 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
673 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
674 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
677 #ifdef CONFIG_PROC_FS
678 /* Initialize /proc/irq/ */
679 extern void init_irq_proc(void);
681 static inline void init_irq_proc(void)
687 int show_interrupts(struct seq_file *p, void *v);
688 int arch_show_interrupts(struct seq_file *p, int prec);
690 extern int early_irq_init(void);
691 extern int arch_probe_nr_irqs(void);
692 extern int arch_early_irq_init(void);
694 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
696 * We want to know which function is an entrypoint of a hardirq or a softirq.
698 #define __irq_entry __attribute__((__section__(".irqentry.text")))
699 #define __softirq_entry \
700 __attribute__((__section__(".softirqentry.text")))
702 /* Limits of hardirq entrypoints */
703 extern char __irqentry_text_start[];
704 extern char __irqentry_text_end[];
705 /* Limits of softirq entrypoints */
706 extern char __softirqentry_text_start[];
707 extern char __softirqentry_text_end[];
711 #define __softirq_entry