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 <asm/atomic.h>
14 #include <asm/ptrace.h>
15 #include <asm/system.h>
18 * These correspond to the IORESOURCE_IRQ_* defines in
19 * linux/ioport.h to select the interrupt line behaviour. When
20 * requesting an interrupt without specifying a IRQF_TRIGGER, the
21 * setting should be assumed to be "as already configured", which
22 * may be as per machine or firmware initialisation.
24 #define IRQF_TRIGGER_NONE 0x00000000
25 #define IRQF_TRIGGER_RISING 0x00000001
26 #define IRQF_TRIGGER_FALLING 0x00000002
27 #define IRQF_TRIGGER_HIGH 0x00000004
28 #define IRQF_TRIGGER_LOW 0x00000008
29 #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
30 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
31 #define IRQF_TRIGGER_PROBE 0x00000010
34 * These flags used only by the kernel as part of the
35 * irq handling routines.
37 * IRQF_DISABLED - keep irqs disabled when calling the action handler
38 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
39 * IRQF_SHARED - allow sharing the irq among several devices
40 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
41 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
43 #define IRQF_DISABLED 0x00000020
44 #define IRQF_SAMPLE_RANDOM 0x00000040
45 #define IRQF_SHARED 0x00000080
46 #define IRQF_PROBE_SHARED 0x00000100
47 #define IRQF_TIMER 0x00000200
48 #define IRQF_PERCPU 0x00000400
51 * Migration helpers. Scheduled for removal in 1/2007
52 * Do not use for new code !
54 #define SA_INTERRUPT IRQF_DISABLED
55 #define SA_SAMPLE_RANDOM IRQF_SAMPLE_RANDOM
56 #define SA_SHIRQ IRQF_SHARED
57 #define SA_PROBEIRQ IRQF_PROBE_SHARED
58 #define SA_PERCPU IRQF_PERCPU
60 #define SA_TRIGGER_LOW IRQF_TRIGGER_LOW
61 #define SA_TRIGGER_HIGH IRQF_TRIGGER_HIGH
62 #define SA_TRIGGER_FALLING IRQF_TRIGGER_FALLING
63 #define SA_TRIGGER_RISING IRQF_TRIGGER_RISING
64 #define SA_TRIGGER_MASK IRQF_TRIGGER_MASK
67 irqreturn_t (*handler)(int, void *, struct pt_regs *);
72 struct irqaction *next;
74 struct proc_dir_entry *dir;
77 extern irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs);
78 extern int request_irq(unsigned int,
79 irqreturn_t (*handler)(int, void *, struct pt_regs *),
80 unsigned long, const char *, void *);
81 extern void free_irq(unsigned int, void *);
84 #ifdef CONFIG_GENERIC_HARDIRQS
85 extern void disable_irq_nosync(unsigned int irq);
86 extern void disable_irq(unsigned int irq);
87 extern void enable_irq(unsigned int irq);
90 * Special lockdep variants of irq disabling/enabling.
91 * These should be used for locking constructs that
92 * know that a particular irq context which is disabled,
93 * and which is the only irq-context user of a lock,
94 * that it's safe to take the lock in the irq-disabled
95 * section without disabling hardirqs.
97 * On !CONFIG_LOCKDEP they are equivalent to the normal
98 * irq disable/enable methods.
100 static inline void disable_irq_nosync_lockdep(unsigned int irq)
102 disable_irq_nosync(irq);
103 #ifdef CONFIG_LOCKDEP
108 static inline void disable_irq_lockdep(unsigned int irq)
111 #ifdef CONFIG_LOCKDEP
116 static inline void enable_irq_lockdep(unsigned int irq)
118 #ifdef CONFIG_LOCKDEP
124 /* IRQ wakeup (PM) control: */
125 extern int set_irq_wake(unsigned int irq, unsigned int on);
127 static inline int enable_irq_wake(unsigned int irq)
129 return set_irq_wake(irq, 1);
132 static inline int disable_irq_wake(unsigned int irq)
134 return set_irq_wake(irq, 0);
137 #else /* !CONFIG_GENERIC_HARDIRQS */
139 * NOTE: non-genirq architectures, if they want to support the lock
140 * validator need to define the methods below in their asm/irq.h
141 * files, under an #ifdef CONFIG_LOCKDEP section.
143 # ifndef CONFIG_LOCKDEP
144 # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
145 # define disable_irq_lockdep(irq) disable_irq(irq)
146 # define enable_irq_lockdep(irq) enable_irq(irq)
149 #endif /* CONFIG_GENERIC_HARDIRQS */
151 #ifndef __ARCH_SET_SOFTIRQ_PENDING
152 #define set_softirq_pending(x) (local_softirq_pending() = (x))
153 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
157 * Temporary defines for UP kernels, until all code gets fixed.
160 static inline void __deprecated cli(void)
164 static inline void __deprecated sti(void)
168 static inline void __deprecated save_flags(unsigned long *x)
170 local_save_flags(*x);
172 #define save_flags(x) save_flags(&x)
173 static inline void __deprecated restore_flags(unsigned long x)
175 local_irq_restore(x);
178 static inline void __deprecated save_and_cli(unsigned long *x)
182 #define save_and_cli(x) save_and_cli(&x)
183 #endif /* CONFIG_SMP */
185 /* SoftIRQ primitives. */
186 #define local_bh_disable() \
187 do { add_preempt_count(SOFTIRQ_OFFSET); barrier(); } while (0)
188 #define __local_bh_enable() \
189 do { barrier(); sub_preempt_count(SOFTIRQ_OFFSET); } while (0)
191 extern void local_bh_enable(void);
193 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
194 frequency threaded job scheduling. For almost all the purposes
195 tasklets are more than enough. F.e. all serial device BHs et
196 al. should be converted to tasklets, not to softirqs.
209 /* softirq mask and active fields moved to irq_cpustat_t in
210 * asm/hardirq.h to get better cache usage. KAO
213 struct softirq_action
215 void (*action)(struct softirq_action *);
219 asmlinkage void do_softirq(void);
220 extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
221 extern void softirq_init(void);
222 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
223 extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
224 extern void FASTCALL(raise_softirq(unsigned int nr));
227 /* Tasklets --- multithreaded analogue of BHs.
229 Main feature differing them of generic softirqs: tasklet
230 is running only on one CPU simultaneously.
232 Main feature differing them of BHs: different tasklets
233 may be run simultaneously on different CPUs.
236 * If tasklet_schedule() is called, then tasklet is guaranteed
237 to be executed on some cpu at least once after this.
238 * If the tasklet is already scheduled, but its excecution is still not
239 started, it will be executed only once.
240 * If this tasklet is already running on another CPU (or schedule is called
241 from tasklet itself), it is rescheduled for later.
242 * Tasklet is strictly serialized wrt itself, but not
243 wrt another tasklets. If client needs some intertask synchronization,
244 he makes it with spinlocks.
247 struct tasklet_struct
249 struct tasklet_struct *next;
252 void (*func)(unsigned long);
256 #define DECLARE_TASKLET(name, func, data) \
257 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
259 #define DECLARE_TASKLET_DISABLED(name, func, data) \
260 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
265 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
266 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
270 static inline int tasklet_trylock(struct tasklet_struct *t)
272 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
275 static inline void tasklet_unlock(struct tasklet_struct *t)
277 smp_mb__before_clear_bit();
278 clear_bit(TASKLET_STATE_RUN, &(t)->state);
281 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
283 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
286 #define tasklet_trylock(t) 1
287 #define tasklet_unlock_wait(t) do { } while (0)
288 #define tasklet_unlock(t) do { } while (0)
291 extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
293 static inline void tasklet_schedule(struct tasklet_struct *t)
295 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
296 __tasklet_schedule(t);
299 extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
301 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
303 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
304 __tasklet_hi_schedule(t);
308 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
310 atomic_inc(&t->count);
311 smp_mb__after_atomic_inc();
314 static inline void tasklet_disable(struct tasklet_struct *t)
316 tasklet_disable_nosync(t);
317 tasklet_unlock_wait(t);
321 static inline void tasklet_enable(struct tasklet_struct *t)
323 smp_mb__before_atomic_dec();
324 atomic_dec(&t->count);
327 static inline void tasklet_hi_enable(struct tasklet_struct *t)
329 smp_mb__before_atomic_dec();
330 atomic_dec(&t->count);
333 extern void tasklet_kill(struct tasklet_struct *t);
334 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
335 extern void tasklet_init(struct tasklet_struct *t,
336 void (*func)(unsigned long), unsigned long data);
339 * Autoprobing for irqs:
341 * probe_irq_on() and probe_irq_off() provide robust primitives
342 * for accurate IRQ probing during kernel initialization. They are
343 * reasonably simple to use, are not "fooled" by spurious interrupts,
344 * and, unlike other attempts at IRQ probing, they do not get hung on
345 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
347 * For reasonably foolproof probing, use them as follows:
349 * 1. clear and/or mask the device's internal interrupt.
351 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
352 * 4. enable the device and cause it to trigger an interrupt.
353 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
354 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
355 * 7. service the device to clear its pending interrupt.
356 * 8. loop again if paranoia is required.
358 * probe_irq_on() returns a mask of allocated irq's.
360 * probe_irq_off() takes the mask as a parameter,
361 * and returns the irq number which occurred,
362 * or zero if none occurred, or a negative irq number
363 * if more than one irq occurred.
366 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
367 static inline unsigned long probe_irq_on(void)
371 static inline int probe_irq_off(unsigned long val)
375 static inline unsigned int probe_irq_mask(unsigned long val)
380 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
381 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
382 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */