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 <asm/atomic.h>
15 #include <asm/ptrace.h>
16 #include <asm/system.h>
19 * These correspond to the IORESOURCE_IRQ_* defines in
20 * linux/ioport.h to select the interrupt line behaviour. When
21 * requesting an interrupt without specifying a IRQF_TRIGGER, the
22 * setting should be assumed to be "as already configured", which
23 * may be as per machine or firmware initialisation.
25 #define IRQF_TRIGGER_NONE 0x00000000
26 #define IRQF_TRIGGER_RISING 0x00000001
27 #define IRQF_TRIGGER_FALLING 0x00000002
28 #define IRQF_TRIGGER_HIGH 0x00000004
29 #define IRQF_TRIGGER_LOW 0x00000008
30 #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
31 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
32 #define IRQF_TRIGGER_PROBE 0x00000010
35 * These flags used only by the kernel as part of the
36 * irq handling routines.
38 * IRQF_DISABLED - keep irqs disabled when calling the action handler
39 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
40 * IRQF_SHARED - allow sharing the irq among several devices
41 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
42 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
44 #define IRQF_DISABLED 0x00000020
45 #define IRQF_SAMPLE_RANDOM 0x00000040
46 #define IRQF_SHARED 0x00000080
47 #define IRQF_PROBE_SHARED 0x00000100
48 #define IRQF_TIMER 0x00000200
49 #define IRQF_PERCPU 0x00000400
52 * Migration helpers. Scheduled for removal in 1/2007
53 * Do not use for new code !
55 #define SA_INTERRUPT IRQF_DISABLED
56 #define SA_SAMPLE_RANDOM IRQF_SAMPLE_RANDOM
57 #define SA_SHIRQ IRQF_SHARED
58 #define SA_PROBEIRQ IRQF_PROBE_SHARED
59 #define SA_PERCPU IRQF_PERCPU
61 #define SA_TRIGGER_LOW IRQF_TRIGGER_LOW
62 #define SA_TRIGGER_HIGH IRQF_TRIGGER_HIGH
63 #define SA_TRIGGER_FALLING IRQF_TRIGGER_FALLING
64 #define SA_TRIGGER_RISING IRQF_TRIGGER_RISING
65 #define SA_TRIGGER_MASK IRQF_TRIGGER_MASK
68 irqreturn_t (*handler)(int, void *, struct pt_regs *);
73 struct irqaction *next;
75 struct proc_dir_entry *dir;
78 extern irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs);
79 extern int request_irq(unsigned int,
80 irqreturn_t (*handler)(int, void *, struct pt_regs *),
81 unsigned long, const char *, void *);
82 extern void free_irq(unsigned int, void *);
85 * On lockdep we dont want to enable hardirqs in hardirq
86 * context. Use local_irq_enable_in_hardirq() to annotate
87 * kernel code that has to do this nevertheless (pretty much
88 * the only valid case is for old/broken hardware that is
91 * NOTE: in theory this might break fragile code that relies
92 * on hardirq delivery - in practice we dont seem to have such
93 * places left. So the only effect should be slightly increased
97 # define local_irq_enable_in_hardirq() do { } while (0)
99 # define local_irq_enable_in_hardirq() local_irq_enable()
102 #ifdef CONFIG_GENERIC_HARDIRQS
103 extern void disable_irq_nosync(unsigned int irq);
104 extern void disable_irq(unsigned int irq);
105 extern void enable_irq(unsigned int irq);
108 * Special lockdep variants of irq disabling/enabling.
109 * These should be used for locking constructs that
110 * know that a particular irq context which is disabled,
111 * and which is the only irq-context user of a lock,
112 * that it's safe to take the lock in the irq-disabled
113 * section without disabling hardirqs.
115 * On !CONFIG_LOCKDEP they are equivalent to the normal
116 * irq disable/enable methods.
118 static inline void disable_irq_nosync_lockdep(unsigned int irq)
120 disable_irq_nosync(irq);
121 #ifdef CONFIG_LOCKDEP
126 static inline void disable_irq_lockdep(unsigned int irq)
129 #ifdef CONFIG_LOCKDEP
134 static inline void enable_irq_lockdep(unsigned int irq)
136 #ifdef CONFIG_LOCKDEP
142 /* IRQ wakeup (PM) control: */
143 extern int set_irq_wake(unsigned int irq, unsigned int on);
145 static inline int enable_irq_wake(unsigned int irq)
147 return set_irq_wake(irq, 1);
150 static inline int disable_irq_wake(unsigned int irq)
152 return set_irq_wake(irq, 0);
155 #else /* !CONFIG_GENERIC_HARDIRQS */
157 * NOTE: non-genirq architectures, if they want to support the lock
158 * validator need to define the methods below in their asm/irq.h
159 * files, under an #ifdef CONFIG_LOCKDEP section.
161 # ifndef CONFIG_LOCKDEP
162 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
163 # define disable_irq_lockdep(irq) disable_irq(irq)
164 # define enable_irq_lockdep(irq) enable_irq(irq)
167 #endif /* CONFIG_GENERIC_HARDIRQS */
169 #ifdef CONFIG_HAVE_IRQ_IGNORE_UNHANDLED
170 int irq_ignore_unhandled(unsigned int irq);
172 #define irq_ignore_unhandled(irq) 0
175 #ifndef __ARCH_SET_SOFTIRQ_PENDING
176 #define set_softirq_pending(x) (local_softirq_pending() = (x))
177 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
181 * Temporary defines for UP kernels, until all code gets fixed.
184 static inline void __deprecated cli(void)
188 static inline void __deprecated sti(void)
192 static inline void __deprecated save_flags(unsigned long *x)
194 local_save_flags(*x);
196 #define save_flags(x) save_flags(&x)
197 static inline void __deprecated restore_flags(unsigned long x)
199 local_irq_restore(x);
202 static inline void __deprecated save_and_cli(unsigned long *x)
206 #define save_and_cli(x) save_and_cli(&x)
207 #endif /* CONFIG_SMP */
209 extern void local_bh_disable(void);
210 extern void __local_bh_enable(void);
211 extern void _local_bh_enable(void);
212 extern void local_bh_enable(void);
213 extern void local_bh_enable_ip(unsigned long ip);
215 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
216 frequency threaded job scheduling. For almost all the purposes
217 tasklets are more than enough. F.e. all serial device BHs et
218 al. should be converted to tasklets, not to softirqs.
231 /* softirq mask and active fields moved to irq_cpustat_t in
232 * asm/hardirq.h to get better cache usage. KAO
235 struct softirq_action
237 void (*action)(struct softirq_action *);
241 asmlinkage void do_softirq(void);
242 extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
243 extern void softirq_init(void);
244 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
245 extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
246 extern void FASTCALL(raise_softirq(unsigned int nr));
249 /* Tasklets --- multithreaded analogue of BHs.
251 Main feature differing them of generic softirqs: tasklet
252 is running only on one CPU simultaneously.
254 Main feature differing them of BHs: different tasklets
255 may be run simultaneously on different CPUs.
258 * If tasklet_schedule() is called, then tasklet is guaranteed
259 to be executed on some cpu at least once after this.
260 * If the tasklet is already scheduled, but its excecution is still not
261 started, it will be executed only once.
262 * If this tasklet is already running on another CPU (or schedule is called
263 from tasklet itself), it is rescheduled for later.
264 * Tasklet is strictly serialized wrt itself, but not
265 wrt another tasklets. If client needs some intertask synchronization,
266 he makes it with spinlocks.
269 struct tasklet_struct
271 struct tasklet_struct *next;
274 void (*func)(unsigned long);
278 #define DECLARE_TASKLET(name, func, data) \
279 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
281 #define DECLARE_TASKLET_DISABLED(name, func, data) \
282 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
287 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
288 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
292 static inline int tasklet_trylock(struct tasklet_struct *t)
294 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
297 static inline void tasklet_unlock(struct tasklet_struct *t)
299 smp_mb__before_clear_bit();
300 clear_bit(TASKLET_STATE_RUN, &(t)->state);
303 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
305 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
308 #define tasklet_trylock(t) 1
309 #define tasklet_unlock_wait(t) do { } while (0)
310 #define tasklet_unlock(t) do { } while (0)
313 extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
315 static inline void tasklet_schedule(struct tasklet_struct *t)
317 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
318 __tasklet_schedule(t);
321 extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
323 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
325 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
326 __tasklet_hi_schedule(t);
330 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
332 atomic_inc(&t->count);
333 smp_mb__after_atomic_inc();
336 static inline void tasklet_disable(struct tasklet_struct *t)
338 tasklet_disable_nosync(t);
339 tasklet_unlock_wait(t);
343 static inline void tasklet_enable(struct tasklet_struct *t)
345 smp_mb__before_atomic_dec();
346 atomic_dec(&t->count);
349 static inline void tasklet_hi_enable(struct tasklet_struct *t)
351 smp_mb__before_atomic_dec();
352 atomic_dec(&t->count);
355 extern void tasklet_kill(struct tasklet_struct *t);
356 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
357 extern void tasklet_init(struct tasklet_struct *t,
358 void (*func)(unsigned long), unsigned long data);
361 * Autoprobing for irqs:
363 * probe_irq_on() and probe_irq_off() provide robust primitives
364 * for accurate IRQ probing during kernel initialization. They are
365 * reasonably simple to use, are not "fooled" by spurious interrupts,
366 * and, unlike other attempts at IRQ probing, they do not get hung on
367 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
369 * For reasonably foolproof probing, use them as follows:
371 * 1. clear and/or mask the device's internal interrupt.
373 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
374 * 4. enable the device and cause it to trigger an interrupt.
375 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
376 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
377 * 7. service the device to clear its pending interrupt.
378 * 8. loop again if paranoia is required.
380 * probe_irq_on() returns a mask of allocated irq's.
382 * probe_irq_off() takes the mask as a parameter,
383 * and returns the irq number which occurred,
384 * or zero if none occurred, or a negative irq number
385 * if more than one irq occurred.
388 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
389 static inline unsigned long probe_irq_on(void)
393 static inline int probe_irq_off(unsigned long val)
397 static inline unsigned int probe_irq_mask(unsigned long val)
402 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
403 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
404 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */