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/irqnr.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
63 typedef irqreturn_t (*irq_handler_t
)(int, void *);
66 irq_handler_t handler
;
71 struct irqaction
*next
;
73 struct proc_dir_entry
*dir
;
76 extern irqreturn_t
no_action(int cpl
, void *dev_id
);
77 extern int __must_check
request_irq(unsigned int, irq_handler_t handler
,
78 unsigned long, const char *, void *);
79 extern void free_irq(unsigned int, void *);
83 extern int __must_check
devm_request_irq(struct device
*dev
, unsigned int irq
,
84 irq_handler_t handler
, unsigned long irqflags
,
85 const char *devname
, void *dev_id
);
86 extern void devm_free_irq(struct device
*dev
, unsigned int irq
, void *dev_id
);
89 * On lockdep we dont want to enable hardirqs in hardirq
90 * context. Use local_irq_enable_in_hardirq() to annotate
91 * kernel code that has to do this nevertheless (pretty much
92 * the only valid case is for old/broken hardware that is
95 * NOTE: in theory this might break fragile code that relies
96 * on hardirq delivery - in practice we dont seem to have such
97 * places left. So the only effect should be slightly increased
100 #ifdef CONFIG_LOCKDEP
101 # define local_irq_enable_in_hardirq() do { } while (0)
103 # define local_irq_enable_in_hardirq() local_irq_enable()
106 extern void disable_irq_nosync(unsigned int irq
);
107 extern void disable_irq(unsigned int irq
);
108 extern void enable_irq(unsigned int irq
);
110 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
112 extern cpumask_var_t irq_default_affinity
;
114 extern int irq_set_affinity(unsigned int irq
, const struct cpumask
*cpumask
);
115 extern int irq_can_set_affinity(unsigned int irq
);
116 extern int irq_select_affinity(unsigned int irq
);
118 #else /* CONFIG_SMP */
120 static inline int irq_set_affinity(unsigned int irq
, const struct cpumask
*m
)
125 static inline int irq_can_set_affinity(unsigned int irq
)
130 static inline int irq_select_affinity(unsigned int irq
) { return 0; }
132 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
134 #ifdef CONFIG_GENERIC_HARDIRQS
136 * Special lockdep variants of irq disabling/enabling.
137 * These should be used for locking constructs that
138 * know that a particular irq context which is disabled,
139 * and which is the only irq-context user of a lock,
140 * that it's safe to take the lock in the irq-disabled
141 * section without disabling hardirqs.
143 * On !CONFIG_LOCKDEP they are equivalent to the normal
144 * irq disable/enable methods.
146 static inline void disable_irq_nosync_lockdep(unsigned int irq
)
148 disable_irq_nosync(irq
);
149 #ifdef CONFIG_LOCKDEP
154 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq
, unsigned long *flags
)
156 disable_irq_nosync(irq
);
157 #ifdef CONFIG_LOCKDEP
158 local_irq_save(*flags
);
162 static inline void disable_irq_lockdep(unsigned int irq
)
165 #ifdef CONFIG_LOCKDEP
170 static inline void enable_irq_lockdep(unsigned int irq
)
172 #ifdef CONFIG_LOCKDEP
178 static inline void enable_irq_lockdep_irqrestore(unsigned int irq
, unsigned long *flags
)
180 #ifdef CONFIG_LOCKDEP
181 local_irq_restore(*flags
);
186 /* IRQ wakeup (PM) control: */
187 extern int set_irq_wake(unsigned int irq
, unsigned int on
);
189 static inline int enable_irq_wake(unsigned int irq
)
191 return set_irq_wake(irq
, 1);
194 static inline int disable_irq_wake(unsigned int irq
)
196 return set_irq_wake(irq
, 0);
199 #else /* !CONFIG_GENERIC_HARDIRQS */
201 * NOTE: non-genirq architectures, if they want to support the lock
202 * validator need to define the methods below in their asm/irq.h
203 * files, under an #ifdef CONFIG_LOCKDEP section.
205 #ifndef CONFIG_LOCKDEP
206 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
207 # define disable_irq_nosync_lockdep_irqsave(irq, flags) \
208 disable_irq_nosync(irq)
209 # define disable_irq_lockdep(irq) disable_irq(irq)
210 # define enable_irq_lockdep(irq) enable_irq(irq)
211 # define enable_irq_lockdep_irqrestore(irq, flags) \
215 static inline int enable_irq_wake(unsigned int irq
)
220 static inline int disable_irq_wake(unsigned int irq
)
224 #endif /* CONFIG_GENERIC_HARDIRQS */
226 #ifndef __ARCH_SET_SOFTIRQ_PENDING
227 #define set_softirq_pending(x) (local_softirq_pending() = (x))
228 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
231 /* Some architectures might implement lazy enabling/disabling of
232 * interrupts. In some cases, such as stop_machine, we might want
233 * to ensure that after a local_irq_disable(), interrupts have
234 * really been disabled in hardware. Such architectures need to
235 * implement the following hook.
237 #ifndef hard_irq_disable
238 #define hard_irq_disable() do { } while(0)
241 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
242 frequency threaded job scheduling. For almost all the purposes
243 tasklets are more than enough. F.e. all serial device BHs et
244 al. should be converted to tasklets, not to softirqs.
256 RCU_SOFTIRQ
, /* Preferable RCU should always be the last softirq */
261 /* softirq mask and active fields moved to irq_cpustat_t in
262 * asm/hardirq.h to get better cache usage. KAO
265 struct softirq_action
267 void (*action
)(struct softirq_action
*);
270 asmlinkage
void do_softirq(void);
271 asmlinkage
void __do_softirq(void);
272 extern void open_softirq(int nr
, void (*action
)(struct softirq_action
*));
273 extern void softirq_init(void);
274 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
275 extern void raise_softirq_irqoff(unsigned int nr
);
276 extern void raise_softirq(unsigned int nr
);
278 /* This is the worklist that queues up per-cpu softirq work.
280 * send_remote_sendirq() adds work to these lists, and
281 * the softirq handler itself dequeues from them. The queues
282 * are protected by disabling local cpu interrupts and they must
283 * only be accessed by the local cpu that they are for.
285 DECLARE_PER_CPU(struct list_head
[NR_SOFTIRQS
], softirq_work_list
);
287 /* Try to send a softirq to a remote cpu. If this cannot be done, the
288 * work will be queued to the local cpu.
290 extern void send_remote_softirq(struct call_single_data
*cp
, int cpu
, int softirq
);
292 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
293 * and compute the current cpu, passed in as 'this_cpu'.
295 extern void __send_remote_softirq(struct call_single_data
*cp
, int cpu
,
296 int this_cpu
, int softirq
);
298 /* Tasklets --- multithreaded analogue of BHs.
300 Main feature differing them of generic softirqs: tasklet
301 is running only on one CPU simultaneously.
303 Main feature differing them of BHs: different tasklets
304 may be run simultaneously on different CPUs.
307 * If tasklet_schedule() is called, then tasklet is guaranteed
308 to be executed on some cpu at least once after this.
309 * If the tasklet is already scheduled, but its excecution is still not
310 started, it will be executed only once.
311 * If this tasklet is already running on another CPU (or schedule is called
312 from tasklet itself), it is rescheduled for later.
313 * Tasklet is strictly serialized wrt itself, but not
314 wrt another tasklets. If client needs some intertask synchronization,
315 he makes it with spinlocks.
318 struct tasklet_struct
320 struct tasklet_struct
*next
;
323 void (*func
)(unsigned long);
327 #define DECLARE_TASKLET(name, func, data) \
328 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
330 #define DECLARE_TASKLET_DISABLED(name, func, data) \
331 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
336 TASKLET_STATE_SCHED
, /* Tasklet is scheduled for execution */
337 TASKLET_STATE_RUN
/* Tasklet is running (SMP only) */
341 static inline int tasklet_trylock(struct tasklet_struct
*t
)
343 return !test_and_set_bit(TASKLET_STATE_RUN
, &(t
)->state
);
346 static inline void tasklet_unlock(struct tasklet_struct
*t
)
348 smp_mb__before_clear_bit();
349 clear_bit(TASKLET_STATE_RUN
, &(t
)->state
);
352 static inline void tasklet_unlock_wait(struct tasklet_struct
*t
)
354 while (test_bit(TASKLET_STATE_RUN
, &(t
)->state
)) { barrier(); }
357 #define tasklet_trylock(t) 1
358 #define tasklet_unlock_wait(t) do { } while (0)
359 #define tasklet_unlock(t) do { } while (0)
362 extern void __tasklet_schedule(struct tasklet_struct
*t
);
364 static inline void tasklet_schedule(struct tasklet_struct
*t
)
366 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
367 __tasklet_schedule(t
);
370 extern void __tasklet_hi_schedule(struct tasklet_struct
*t
);
372 static inline void tasklet_hi_schedule(struct tasklet_struct
*t
)
374 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
375 __tasklet_hi_schedule(t
);
379 static inline void tasklet_disable_nosync(struct tasklet_struct
*t
)
381 atomic_inc(&t
->count
);
382 smp_mb__after_atomic_inc();
385 static inline void tasklet_disable(struct tasklet_struct
*t
)
387 tasklet_disable_nosync(t
);
388 tasklet_unlock_wait(t
);
392 static inline void tasklet_enable(struct tasklet_struct
*t
)
394 smp_mb__before_atomic_dec();
395 atomic_dec(&t
->count
);
398 static inline void tasklet_hi_enable(struct tasklet_struct
*t
)
400 smp_mb__before_atomic_dec();
401 atomic_dec(&t
->count
);
404 extern void tasklet_kill(struct tasklet_struct
*t
);
405 extern void tasklet_kill_immediate(struct tasklet_struct
*t
, unsigned int cpu
);
406 extern void tasklet_init(struct tasklet_struct
*t
,
407 void (*func
)(unsigned long), unsigned long data
);
410 * Autoprobing for irqs:
412 * probe_irq_on() and probe_irq_off() provide robust primitives
413 * for accurate IRQ probing during kernel initialization. They are
414 * reasonably simple to use, are not "fooled" by spurious interrupts,
415 * and, unlike other attempts at IRQ probing, they do not get hung on
416 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
418 * For reasonably foolproof probing, use them as follows:
420 * 1. clear and/or mask the device's internal interrupt.
422 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
423 * 4. enable the device and cause it to trigger an interrupt.
424 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
425 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
426 * 7. service the device to clear its pending interrupt.
427 * 8. loop again if paranoia is required.
429 * probe_irq_on() returns a mask of allocated irq's.
431 * probe_irq_off() takes the mask as a parameter,
432 * and returns the irq number which occurred,
433 * or zero if none occurred, or a negative irq number
434 * if more than one irq occurred.
437 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
438 static inline unsigned long probe_irq_on(void)
442 static inline int probe_irq_off(unsigned long val
)
446 static inline unsigned int probe_irq_mask(unsigned long val
)
451 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
452 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
453 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
456 #ifdef CONFIG_PROC_FS
457 /* Initialize /proc/irq/ */
458 extern void init_irq_proc(void);
460 static inline void init_irq_proc(void)
465 int show_interrupts(struct seq_file
*p
, void *v
);
469 extern int early_irq_init(void);
470 extern int arch_early_irq_init(void);
471 extern int arch_init_chip_data(struct irq_desc
*desc
, int cpu
);