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 9/2007
58 * Do not use for new code !
61 unsigned long __deprecated deprecated_irq_flag(unsigned long flag)
66 #define SA_INTERRUPT deprecated_irq_flag(IRQF_DISABLED)
67 #define SA_SAMPLE_RANDOM deprecated_irq_flag(IRQF_SAMPLE_RANDOM)
68 #define SA_SHIRQ deprecated_irq_flag(IRQF_SHARED)
69 #define SA_PROBEIRQ deprecated_irq_flag(IRQF_PROBE_SHARED)
70 #define SA_PERCPU deprecated_irq_flag(IRQF_PERCPU)
72 #define SA_TRIGGER_LOW deprecated_irq_flag(IRQF_TRIGGER_LOW)
73 #define SA_TRIGGER_HIGH deprecated_irq_flag(IRQF_TRIGGER_HIGH)
74 #define SA_TRIGGER_FALLING deprecated_irq_flag(IRQF_TRIGGER_FALLING)
75 #define SA_TRIGGER_RISING deprecated_irq_flag(IRQF_TRIGGER_RISING)
76 #define SA_TRIGGER_MASK deprecated_irq_flag(IRQF_TRIGGER_MASK)
78 typedef irqreturn_t (*irq_handler_t)(int, void *);
81 irq_handler_t handler;
86 struct irqaction *next;
88 struct proc_dir_entry *dir;
91 extern irqreturn_t no_action(int cpl, void *dev_id);
92 extern int __must_check request_irq(unsigned int, irq_handler_t handler,
93 unsigned long, const char *, void *);
94 extern void free_irq(unsigned int, void *);
96 extern int __must_check devm_request_irq(struct device *dev, unsigned int irq,
97 irq_handler_t handler, unsigned long irqflags,
98 const char *devname, void *dev_id);
99 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
102 * On lockdep we dont want to enable hardirqs in hardirq
103 * context. Use local_irq_enable_in_hardirq() to annotate
104 * kernel code that has to do this nevertheless (pretty much
105 * the only valid case is for old/broken hardware that is
108 * NOTE: in theory this might break fragile code that relies
109 * on hardirq delivery - in practice we dont seem to have such
110 * places left. So the only effect should be slightly increased
111 * irqs-off latencies.
113 #ifdef CONFIG_LOCKDEP
114 # define local_irq_enable_in_hardirq() do { } while (0)
116 # define local_irq_enable_in_hardirq() local_irq_enable()
119 #ifdef CONFIG_GENERIC_HARDIRQS
120 extern void disable_irq_nosync(unsigned int irq);
121 extern void disable_irq(unsigned int irq);
122 extern void enable_irq(unsigned int irq);
125 * Special lockdep variants of irq disabling/enabling.
126 * These should be used for locking constructs that
127 * know that a particular irq context which is disabled,
128 * and which is the only irq-context user of a lock,
129 * that it's safe to take the lock in the irq-disabled
130 * section without disabling hardirqs.
132 * On !CONFIG_LOCKDEP they are equivalent to the normal
133 * irq disable/enable methods.
135 static inline void disable_irq_nosync_lockdep(unsigned int irq)
137 disable_irq_nosync(irq);
138 #ifdef CONFIG_LOCKDEP
143 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
145 disable_irq_nosync(irq);
146 #ifdef CONFIG_LOCKDEP
147 local_irq_save(*flags);
151 static inline void disable_irq_lockdep(unsigned int irq)
154 #ifdef CONFIG_LOCKDEP
159 static inline void enable_irq_lockdep(unsigned int irq)
161 #ifdef CONFIG_LOCKDEP
167 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
169 #ifdef CONFIG_LOCKDEP
170 local_irq_restore(*flags);
175 /* IRQ wakeup (PM) control: */
176 extern int set_irq_wake(unsigned int irq, unsigned int on);
178 static inline int enable_irq_wake(unsigned int irq)
180 return set_irq_wake(irq, 1);
183 static inline int disable_irq_wake(unsigned int irq)
185 return set_irq_wake(irq, 0);
188 #else /* !CONFIG_GENERIC_HARDIRQS */
190 * NOTE: non-genirq architectures, if they want to support the lock
191 * validator need to define the methods below in their asm/irq.h
192 * files, under an #ifdef CONFIG_LOCKDEP section.
194 #ifndef CONFIG_LOCKDEP
195 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
196 # define disable_irq_nosync_lockdep_irqsave(irq, flags) \
197 disable_irq_nosync(irq)
198 # define disable_irq_lockdep(irq) disable_irq(irq)
199 # define enable_irq_lockdep(irq) enable_irq(irq)
200 # define enable_irq_lockdep_irqrestore(irq, flags) \
204 #endif /* CONFIG_GENERIC_HARDIRQS */
206 #ifndef __ARCH_SET_SOFTIRQ_PENDING
207 #define set_softirq_pending(x) (local_softirq_pending() = (x))
208 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
212 * Temporary defines for UP kernels, until all code gets fixed.
215 static inline void __deprecated cli(void)
219 static inline void __deprecated sti(void)
223 static inline void __deprecated save_flags(unsigned long *x)
225 local_save_flags(*x);
227 #define save_flags(x) save_flags(&x)
228 static inline void __deprecated restore_flags(unsigned long x)
230 local_irq_restore(x);
233 static inline void __deprecated save_and_cli(unsigned long *x)
237 #define save_and_cli(x) save_and_cli(&x)
238 #endif /* CONFIG_SMP */
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.
255 #ifdef CONFIG_HIGH_RES_TIMERS
260 /* softirq mask and active fields moved to irq_cpustat_t in
261 * asm/hardirq.h to get better cache usage. KAO
264 struct softirq_action
266 void (*action)(struct softirq_action *);
270 asmlinkage void do_softirq(void);
271 extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
272 extern void softirq_init(void);
273 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
274 extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
275 extern void FASTCALL(raise_softirq(unsigned int nr));
278 /* Tasklets --- multithreaded analogue of BHs.
280 Main feature differing them of generic softirqs: tasklet
281 is running only on one CPU simultaneously.
283 Main feature differing them of BHs: different tasklets
284 may be run simultaneously on different CPUs.
287 * If tasklet_schedule() is called, then tasklet is guaranteed
288 to be executed on some cpu at least once after this.
289 * If the tasklet is already scheduled, but its excecution is still not
290 started, it will be executed only once.
291 * If this tasklet is already running on another CPU (or schedule is called
292 from tasklet itself), it is rescheduled for later.
293 * Tasklet is strictly serialized wrt itself, but not
294 wrt another tasklets. If client needs some intertask synchronization,
295 he makes it with spinlocks.
298 struct tasklet_struct
300 struct tasklet_struct *next;
303 void (*func)(unsigned long);
307 #define DECLARE_TASKLET(name, func, data) \
308 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
310 #define DECLARE_TASKLET_DISABLED(name, func, data) \
311 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
316 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
317 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
321 static inline int tasklet_trylock(struct tasklet_struct *t)
323 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
326 static inline void tasklet_unlock(struct tasklet_struct *t)
328 smp_mb__before_clear_bit();
329 clear_bit(TASKLET_STATE_RUN, &(t)->state);
332 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
334 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
337 #define tasklet_trylock(t) 1
338 #define tasklet_unlock_wait(t) do { } while (0)
339 #define tasklet_unlock(t) do { } while (0)
342 extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
344 static inline void tasklet_schedule(struct tasklet_struct *t)
346 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
347 __tasklet_schedule(t);
350 extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
352 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
354 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
355 __tasklet_hi_schedule(t);
359 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
361 atomic_inc(&t->count);
362 smp_mb__after_atomic_inc();
365 static inline void tasklet_disable(struct tasklet_struct *t)
367 tasklet_disable_nosync(t);
368 tasklet_unlock_wait(t);
372 static inline void tasklet_enable(struct tasklet_struct *t)
374 smp_mb__before_atomic_dec();
375 atomic_dec(&t->count);
378 static inline void tasklet_hi_enable(struct tasklet_struct *t)
380 smp_mb__before_atomic_dec();
381 atomic_dec(&t->count);
384 extern void tasklet_kill(struct tasklet_struct *t);
385 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
386 extern void tasklet_init(struct tasklet_struct *t,
387 void (*func)(unsigned long), unsigned long data);
390 * Autoprobing for irqs:
392 * probe_irq_on() and probe_irq_off() provide robust primitives
393 * for accurate IRQ probing during kernel initialization. They are
394 * reasonably simple to use, are not "fooled" by spurious interrupts,
395 * and, unlike other attempts at IRQ probing, they do not get hung on
396 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
398 * For reasonably foolproof probing, use them as follows:
400 * 1. clear and/or mask the device's internal interrupt.
402 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
403 * 4. enable the device and cause it to trigger an interrupt.
404 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
405 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
406 * 7. service the device to clear its pending interrupt.
407 * 8. loop again if paranoia is required.
409 * probe_irq_on() returns a mask of allocated irq's.
411 * probe_irq_off() takes the mask as a parameter,
412 * and returns the irq number which occurred,
413 * or zero if none occurred, or a negative irq number
414 * if more than one irq occurred.
417 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
418 static inline unsigned long probe_irq_on(void)
422 static inline int probe_irq_off(unsigned long val)
426 static inline unsigned int probe_irq_mask(unsigned long val)
431 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
432 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
433 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
436 #ifdef CONFIG_PROC_FS
437 /* Initialize /proc/irq/ */
438 extern void init_irq_proc(void);
440 static inline void init_irq_proc(void)