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
62 typedef irqreturn_t (*irq_handler_t)(int, void *);
65 irq_handler_t handler;
70 struct irqaction *next;
72 struct proc_dir_entry *dir;
75 extern irqreturn_t no_action(int cpl, void *dev_id);
76 extern int __must_check request_irq(unsigned int, irq_handler_t handler,
77 unsigned long, const char *, void *);
78 extern void free_irq(unsigned int, void *);
82 extern int __must_check devm_request_irq(struct device *dev, unsigned int irq,
83 irq_handler_t handler, unsigned long irqflags,
84 const char *devname, void *dev_id);
85 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
88 * On lockdep we dont want to enable hardirqs in hardirq
89 * context. Use local_irq_enable_in_hardirq() to annotate
90 * kernel code that has to do this nevertheless (pretty much
91 * the only valid case is for old/broken hardware that is
94 * NOTE: in theory this might break fragile code that relies
95 * on hardirq delivery - in practice we dont seem to have such
96 * places left. So the only effect should be slightly increased
100 # define local_irq_enable_in_hardirq() do { } while (0)
102 # define local_irq_enable_in_hardirq() local_irq_enable()
105 extern void disable_irq_nosync(unsigned int irq);
106 extern void disable_irq(unsigned int irq);
107 extern void enable_irq(unsigned int irq);
109 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
111 extern cpumask_var_t irq_default_affinity;
113 extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
114 extern int irq_can_set_affinity(unsigned int irq);
115 extern int irq_select_affinity(unsigned int irq);
117 #else /* CONFIG_SMP */
119 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
124 static inline int irq_can_set_affinity(unsigned int irq)
129 static inline int irq_select_affinity(unsigned int irq) { return 0; }
131 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
133 #ifdef CONFIG_GENERIC_HARDIRQS
135 * Special lockdep variants of irq disabling/enabling.
136 * These should be used for locking constructs that
137 * know that a particular irq context which is disabled,
138 * and which is the only irq-context user of a lock,
139 * that it's safe to take the lock in the irq-disabled
140 * section without disabling hardirqs.
142 * On !CONFIG_LOCKDEP they are equivalent to the normal
143 * irq disable/enable methods.
145 static inline void disable_irq_nosync_lockdep(unsigned int irq)
147 disable_irq_nosync(irq);
148 #ifdef CONFIG_LOCKDEP
153 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
155 disable_irq_nosync(irq);
156 #ifdef CONFIG_LOCKDEP
157 local_irq_save(*flags);
161 static inline void disable_irq_lockdep(unsigned int irq)
164 #ifdef CONFIG_LOCKDEP
169 static inline void enable_irq_lockdep(unsigned int irq)
171 #ifdef CONFIG_LOCKDEP
177 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
179 #ifdef CONFIG_LOCKDEP
180 local_irq_restore(*flags);
185 /* IRQ wakeup (PM) control: */
186 extern int set_irq_wake(unsigned int irq, unsigned int on);
188 static inline int enable_irq_wake(unsigned int irq)
190 return set_irq_wake(irq, 1);
193 static inline int disable_irq_wake(unsigned int irq)
195 return set_irq_wake(irq, 0);
198 #else /* !CONFIG_GENERIC_HARDIRQS */
200 * NOTE: non-genirq architectures, if they want to support the lock
201 * validator need to define the methods below in their asm/irq.h
202 * files, under an #ifdef CONFIG_LOCKDEP section.
204 #ifndef CONFIG_LOCKDEP
205 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
206 # define disable_irq_nosync_lockdep_irqsave(irq, flags) \
207 disable_irq_nosync(irq)
208 # define disable_irq_lockdep(irq) disable_irq(irq)
209 # define enable_irq_lockdep(irq) enable_irq(irq)
210 # define enable_irq_lockdep_irqrestore(irq, flags) \
214 static inline int enable_irq_wake(unsigned int irq)
219 static inline int disable_irq_wake(unsigned int irq)
223 #endif /* CONFIG_GENERIC_HARDIRQS */
225 #ifndef __ARCH_SET_SOFTIRQ_PENDING
226 #define set_softirq_pending(x) (local_softirq_pending() = (x))
227 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
230 /* Some architectures might implement lazy enabling/disabling of
231 * interrupts. In some cases, such as stop_machine, we might want
232 * to ensure that after a local_irq_disable(), interrupts have
233 * really been disabled in hardware. Such architectures need to
234 * implement the following hook.
236 #ifndef hard_irq_disable
237 #define hard_irq_disable() do { } while(0)
240 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
241 frequency threaded job scheduling. For almost all the purposes
242 tasklets are more than enough. F.e. all serial device BHs et
243 al. should be converted to tasklets, not to softirqs.
256 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
261 /* map softirq index to softirq name. update 'softirq_to_name' in
262 * kernel/softirq.c when adding a new softirq.
264 extern char *softirq_to_name[NR_SOFTIRQS];
266 /* softirq mask and active fields moved to irq_cpustat_t in
267 * asm/hardirq.h to get better cache usage. KAO
270 struct softirq_action
272 void (*action)(struct softirq_action *);
275 asmlinkage void do_softirq(void);
276 asmlinkage void __do_softirq(void);
277 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
278 extern void softirq_init(void);
279 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
280 extern void raise_softirq_irqoff(unsigned int nr);
281 extern void raise_softirq(unsigned int nr);
283 /* This is the worklist that queues up per-cpu softirq work.
285 * send_remote_sendirq() adds work to these lists, and
286 * the softirq handler itself dequeues from them. The queues
287 * are protected by disabling local cpu interrupts and they must
288 * only be accessed by the local cpu that they are for.
290 DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
292 /* Try to send a softirq to a remote cpu. If this cannot be done, the
293 * work will be queued to the local cpu.
295 extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
297 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
298 * and compute the current cpu, passed in as 'this_cpu'.
300 extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
301 int this_cpu, int softirq);
303 /* Tasklets --- multithreaded analogue of BHs.
305 Main feature differing them of generic softirqs: tasklet
306 is running only on one CPU simultaneously.
308 Main feature differing them of BHs: different tasklets
309 may be run simultaneously on different CPUs.
312 * If tasklet_schedule() is called, then tasklet is guaranteed
313 to be executed on some cpu at least once after this.
314 * If the tasklet is already scheduled, but its excecution is still not
315 started, it will be executed only once.
316 * If this tasklet is already running on another CPU (or schedule is called
317 from tasklet itself), it is rescheduled for later.
318 * Tasklet is strictly serialized wrt itself, but not
319 wrt another tasklets. If client needs some intertask synchronization,
320 he makes it with spinlocks.
323 struct tasklet_struct
325 struct tasklet_struct *next;
328 void (*func)(unsigned long);
332 #define DECLARE_TASKLET(name, func, data) \
333 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
335 #define DECLARE_TASKLET_DISABLED(name, func, data) \
336 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
341 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
342 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
346 static inline int tasklet_trylock(struct tasklet_struct *t)
348 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
351 static inline void tasklet_unlock(struct tasklet_struct *t)
353 smp_mb__before_clear_bit();
354 clear_bit(TASKLET_STATE_RUN, &(t)->state);
357 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
359 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
362 #define tasklet_trylock(t) 1
363 #define tasklet_unlock_wait(t) do { } while (0)
364 #define tasklet_unlock(t) do { } while (0)
367 extern void __tasklet_schedule(struct tasklet_struct *t);
369 static inline void tasklet_schedule(struct tasklet_struct *t)
371 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
372 __tasklet_schedule(t);
375 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
377 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
379 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
380 __tasklet_hi_schedule(t);
384 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
386 atomic_inc(&t->count);
387 smp_mb__after_atomic_inc();
390 static inline void tasklet_disable(struct tasklet_struct *t)
392 tasklet_disable_nosync(t);
393 tasklet_unlock_wait(t);
397 static inline void tasklet_enable(struct tasklet_struct *t)
399 smp_mb__before_atomic_dec();
400 atomic_dec(&t->count);
403 static inline void tasklet_hi_enable(struct tasklet_struct *t)
405 smp_mb__before_atomic_dec();
406 atomic_dec(&t->count);
409 extern void tasklet_kill(struct tasklet_struct *t);
410 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
411 extern void tasklet_init(struct tasklet_struct *t,
412 void (*func)(unsigned long), unsigned long data);
415 * Autoprobing for irqs:
417 * probe_irq_on() and probe_irq_off() provide robust primitives
418 * for accurate IRQ probing during kernel initialization. They are
419 * reasonably simple to use, are not "fooled" by spurious interrupts,
420 * and, unlike other attempts at IRQ probing, they do not get hung on
421 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
423 * For reasonably foolproof probing, use them as follows:
425 * 1. clear and/or mask the device's internal interrupt.
427 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
428 * 4. enable the device and cause it to trigger an interrupt.
429 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
430 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
431 * 7. service the device to clear its pending interrupt.
432 * 8. loop again if paranoia is required.
434 * probe_irq_on() returns a mask of allocated irq's.
436 * probe_irq_off() takes the mask as a parameter,
437 * and returns the irq number which occurred,
438 * or zero if none occurred, or a negative irq number
439 * if more than one irq occurred.
442 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
443 static inline unsigned long probe_irq_on(void)
447 static inline int probe_irq_off(unsigned long val)
451 static inline unsigned int probe_irq_mask(unsigned long val)
456 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
457 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
458 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
461 #ifdef CONFIG_PROC_FS
462 /* Initialize /proc/irq/ */
463 extern void init_irq_proc(void);
465 static inline void init_irq_proc(void)
470 int show_interrupts(struct seq_file *p, void *v);
474 extern int early_irq_init(void);
475 extern int arch_probe_nr_irqs(void);
476 extern int arch_early_irq_init(void);
477 extern int arch_init_chip_data(struct irq_desc *desc, int cpu);