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/hardirq.h>
12 #include <linux/sched.h>
13 #include <linux/irqflags.h>
14 #include <linux/bottom_half.h>
15 #include <linux/device.h>
16 #include <asm/atomic.h>
17 #include <asm/ptrace.h>
18 #include <asm/system.h>
21 * These correspond to the IORESOURCE_IRQ_* defines in
22 * linux/ioport.h to select the interrupt line behaviour. When
23 * requesting an interrupt without specifying a IRQF_TRIGGER, the
24 * setting should be assumed to be "as already configured", which
25 * may be as per machine or firmware initialisation.
27 #define IRQF_TRIGGER_NONE 0x00000000
28 #define IRQF_TRIGGER_RISING 0x00000001
29 #define IRQF_TRIGGER_FALLING 0x00000002
30 #define IRQF_TRIGGER_HIGH 0x00000004
31 #define IRQF_TRIGGER_LOW 0x00000008
32 #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
33 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
34 #define IRQF_TRIGGER_PROBE 0x00000010
37 * These flags used only by the kernel as part of the
38 * irq handling routines.
40 * IRQF_DISABLED - keep irqs disabled when calling the action handler
41 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
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
48 #define IRQF_DISABLED 0x00000020
49 #define IRQF_SAMPLE_RANDOM 0x00000040
50 #define IRQF_SHARED 0x00000080
51 #define IRQF_PROBE_SHARED 0x00000100
52 #define IRQF_TIMER 0x00000200
53 #define IRQF_PERCPU 0x00000400
54 #define IRQF_NOBALANCING 0x00000800
57 * Migration helpers. Scheduled for removal in 1/2007
58 * Do not use for new code !
60 #define SA_INTERRUPT IRQF_DISABLED
61 #define SA_SAMPLE_RANDOM IRQF_SAMPLE_RANDOM
62 #define SA_SHIRQ IRQF_SHARED
63 #define SA_PROBEIRQ IRQF_PROBE_SHARED
64 #define SA_PERCPU IRQF_PERCPU
66 #define SA_TRIGGER_LOW IRQF_TRIGGER_LOW
67 #define SA_TRIGGER_HIGH IRQF_TRIGGER_HIGH
68 #define SA_TRIGGER_FALLING IRQF_TRIGGER_FALLING
69 #define SA_TRIGGER_RISING IRQF_TRIGGER_RISING
70 #define SA_TRIGGER_MASK IRQF_TRIGGER_MASK
72 typedef irqreturn_t (*irq_handler_t
)(int, void *);
75 irq_handler_t handler
;
80 struct irqaction
*next
;
82 struct proc_dir_entry
*dir
;
85 extern irqreturn_t
no_action(int cpl
, void *dev_id
);
86 extern int request_irq(unsigned int, irq_handler_t handler
,
87 unsigned long, const char *, void *);
88 extern void free_irq(unsigned int, void *);
90 extern int devm_request_irq(struct device
*dev
, unsigned int irq
,
91 irq_handler_t handler
, unsigned long irqflags
,
92 const char *devname
, void *dev_id
);
93 extern void devm_free_irq(struct device
*dev
, unsigned int irq
, void *dev_id
);
96 * On lockdep we dont want to enable hardirqs in hardirq
97 * context. Use local_irq_enable_in_hardirq() to annotate
98 * kernel code that has to do this nevertheless (pretty much
99 * the only valid case is for old/broken hardware that is
102 * NOTE: in theory this might break fragile code that relies
103 * on hardirq delivery - in practice we dont seem to have such
104 * places left. So the only effect should be slightly increased
105 * irqs-off latencies.
107 #ifdef CONFIG_LOCKDEP
108 # define local_irq_enable_in_hardirq() do { } while (0)
110 # define local_irq_enable_in_hardirq() local_irq_enable()
113 #ifdef CONFIG_GENERIC_HARDIRQS
114 extern void disable_irq_nosync(unsigned int irq
);
115 extern void disable_irq(unsigned int irq
);
116 extern void enable_irq(unsigned int irq
);
119 * Special lockdep variants of irq disabling/enabling.
120 * These should be used for locking constructs that
121 * know that a particular irq context which is disabled,
122 * and which is the only irq-context user of a lock,
123 * that it's safe to take the lock in the irq-disabled
124 * section without disabling hardirqs.
126 * On !CONFIG_LOCKDEP they are equivalent to the normal
127 * irq disable/enable methods.
129 static inline void disable_irq_nosync_lockdep(unsigned int irq
)
131 disable_irq_nosync(irq
);
132 #ifdef CONFIG_LOCKDEP
137 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq
, unsigned long *flags
)
139 disable_irq_nosync(irq
);
140 #ifdef CONFIG_LOCKDEP
141 local_irq_save(*flags
);
145 static inline void disable_irq_lockdep(unsigned int irq
)
148 #ifdef CONFIG_LOCKDEP
153 static inline void enable_irq_lockdep(unsigned int irq
)
155 #ifdef CONFIG_LOCKDEP
161 static inline void enable_irq_lockdep_irqrestore(unsigned int irq
, unsigned long *flags
)
163 #ifdef CONFIG_LOCKDEP
164 local_irq_restore(*flags
);
169 /* IRQ wakeup (PM) control: */
170 extern int set_irq_wake(unsigned int irq
, unsigned int on
);
172 static inline int enable_irq_wake(unsigned int irq
)
174 return set_irq_wake(irq
, 1);
177 static inline int disable_irq_wake(unsigned int irq
)
179 return set_irq_wake(irq
, 0);
182 #else /* !CONFIG_GENERIC_HARDIRQS */
184 * NOTE: non-genirq architectures, if they want to support the lock
185 * validator need to define the methods below in their asm/irq.h
186 * files, under an #ifdef CONFIG_LOCKDEP section.
188 #ifndef CONFIG_LOCKDEP
189 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
190 # define disable_irq_nosync_lockdep_irqsave(irq, flags) \
191 disable_irq_nosync(irq)
192 # define disable_irq_lockdep(irq) disable_irq(irq)
193 # define enable_irq_lockdep(irq) enable_irq(irq)
194 # define enable_irq_lockdep_irqrestore(irq, flags) \
198 #endif /* CONFIG_GENERIC_HARDIRQS */
200 #ifndef __ARCH_SET_SOFTIRQ_PENDING
201 #define set_softirq_pending(x) (local_softirq_pending() = (x))
202 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
206 * Temporary defines for UP kernels, until all code gets fixed.
209 static inline void __deprecated
cli(void)
213 static inline void __deprecated
sti(void)
217 static inline void __deprecated
save_flags(unsigned long *x
)
219 local_save_flags(*x
);
221 #define save_flags(x) save_flags(&x)
222 static inline void __deprecated
restore_flags(unsigned long x
)
224 local_irq_restore(x
);
227 static inline void __deprecated
save_and_cli(unsigned long *x
)
231 #define save_and_cli(x) save_and_cli(&x)
232 #endif /* CONFIG_SMP */
234 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
235 frequency threaded job scheduling. For almost all the purposes
236 tasklets are more than enough. F.e. all serial device BHs et
237 al. should be converted to tasklets, not to softirqs.
249 #ifdef CONFIG_HIGH_RES_TIMERS
254 /* softirq mask and active fields moved to irq_cpustat_t in
255 * asm/hardirq.h to get better cache usage. KAO
258 struct softirq_action
260 void (*action
)(struct softirq_action
*);
264 asmlinkage
void do_softirq(void);
265 extern void open_softirq(int nr
, void (*action
)(struct softirq_action
*), void *data
);
266 extern void softirq_init(void);
267 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
268 extern void FASTCALL(raise_softirq_irqoff(unsigned int nr
));
269 extern void FASTCALL(raise_softirq(unsigned int nr
));
272 /* Tasklets --- multithreaded analogue of BHs.
274 Main feature differing them of generic softirqs: tasklet
275 is running only on one CPU simultaneously.
277 Main feature differing them of BHs: different tasklets
278 may be run simultaneously on different CPUs.
281 * If tasklet_schedule() is called, then tasklet is guaranteed
282 to be executed on some cpu at least once after this.
283 * If the tasklet is already scheduled, but its excecution is still not
284 started, it will be executed only once.
285 * If this tasklet is already running on another CPU (or schedule is called
286 from tasklet itself), it is rescheduled for later.
287 * Tasklet is strictly serialized wrt itself, but not
288 wrt another tasklets. If client needs some intertask synchronization,
289 he makes it with spinlocks.
292 struct tasklet_struct
294 struct tasklet_struct
*next
;
297 void (*func
)(unsigned long);
301 #define DECLARE_TASKLET(name, func, data) \
302 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
304 #define DECLARE_TASKLET_DISABLED(name, func, data) \
305 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
310 TASKLET_STATE_SCHED
, /* Tasklet is scheduled for execution */
311 TASKLET_STATE_RUN
/* Tasklet is running (SMP only) */
315 static inline int tasklet_trylock(struct tasklet_struct
*t
)
317 return !test_and_set_bit(TASKLET_STATE_RUN
, &(t
)->state
);
320 static inline void tasklet_unlock(struct tasklet_struct
*t
)
322 smp_mb__before_clear_bit();
323 clear_bit(TASKLET_STATE_RUN
, &(t
)->state
);
326 static inline void tasklet_unlock_wait(struct tasklet_struct
*t
)
328 while (test_bit(TASKLET_STATE_RUN
, &(t
)->state
)) { barrier(); }
331 #define tasklet_trylock(t) 1
332 #define tasklet_unlock_wait(t) do { } while (0)
333 #define tasklet_unlock(t) do { } while (0)
336 extern void FASTCALL(__tasklet_schedule(struct tasklet_struct
*t
));
338 static inline void tasklet_schedule(struct tasklet_struct
*t
)
340 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
341 __tasklet_schedule(t
);
344 extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct
*t
));
346 static inline void tasklet_hi_schedule(struct tasklet_struct
*t
)
348 if (!test_and_set_bit(TASKLET_STATE_SCHED
, &t
->state
))
349 __tasklet_hi_schedule(t
);
353 static inline void tasklet_disable_nosync(struct tasklet_struct
*t
)
355 atomic_inc(&t
->count
);
356 smp_mb__after_atomic_inc();
359 static inline void tasklet_disable(struct tasklet_struct
*t
)
361 tasklet_disable_nosync(t
);
362 tasklet_unlock_wait(t
);
366 static inline void tasklet_enable(struct tasklet_struct
*t
)
368 smp_mb__before_atomic_dec();
369 atomic_dec(&t
->count
);
372 static inline void tasklet_hi_enable(struct tasklet_struct
*t
)
374 smp_mb__before_atomic_dec();
375 atomic_dec(&t
->count
);
378 extern void tasklet_kill(struct tasklet_struct
*t
);
379 extern void tasklet_kill_immediate(struct tasklet_struct
*t
, unsigned int cpu
);
380 extern void tasklet_init(struct tasklet_struct
*t
,
381 void (*func
)(unsigned long), unsigned long data
);
384 * Autoprobing for irqs:
386 * probe_irq_on() and probe_irq_off() provide robust primitives
387 * for accurate IRQ probing during kernel initialization. They are
388 * reasonably simple to use, are not "fooled" by spurious interrupts,
389 * and, unlike other attempts at IRQ probing, they do not get hung on
390 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
392 * For reasonably foolproof probing, use them as follows:
394 * 1. clear and/or mask the device's internal interrupt.
396 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
397 * 4. enable the device and cause it to trigger an interrupt.
398 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
399 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
400 * 7. service the device to clear its pending interrupt.
401 * 8. loop again if paranoia is required.
403 * probe_irq_on() returns a mask of allocated irq's.
405 * probe_irq_off() takes the mask as a parameter,
406 * and returns the irq number which occurred,
407 * or zero if none occurred, or a negative irq number
408 * if more than one irq occurred.
411 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
412 static inline unsigned long probe_irq_on(void)
416 static inline int probe_irq_off(unsigned long val
)
420 static inline unsigned int probe_irq_mask(unsigned long val
)
425 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
426 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
427 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
430 #ifdef CONFIG_PROC_FS
431 /* Initialize /proc/irq/ */
432 extern void init_irq_proc(void);
434 static inline void init_irq_proc(void)