Linux kernel mirror (for testing)
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linux
1/* interrupt.h */
2#ifndef _LINUX_INTERRUPT_H
3#define _LINUX_INTERRUPT_H
4
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>
19
20/*
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.
26 */
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
35
36/*
37 * These flags used only by the kernel as part of the
38 * irq handling routines.
39 *
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
47 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
48 * registered first in an shared interrupt is considered for
49 * performance reasons)
50 */
51#define IRQF_DISABLED 0x00000020
52#define IRQF_SAMPLE_RANDOM 0x00000040
53#define IRQF_SHARED 0x00000080
54#define IRQF_PROBE_SHARED 0x00000100
55#define IRQF_TIMER 0x00000200
56#define IRQF_PERCPU 0x00000400
57#define IRQF_NOBALANCING 0x00000800
58#define IRQF_IRQPOLL 0x00001000
59
60/*
61 * Migration helpers. Scheduled for removal in 9/2007
62 * Do not use for new code !
63 */
64static inline
65unsigned long __deprecated deprecated_irq_flag(unsigned long flag)
66{
67 return flag;
68}
69
70#define SA_INTERRUPT deprecated_irq_flag(IRQF_DISABLED)
71#define SA_SAMPLE_RANDOM deprecated_irq_flag(IRQF_SAMPLE_RANDOM)
72#define SA_SHIRQ deprecated_irq_flag(IRQF_SHARED)
73#define SA_PROBEIRQ deprecated_irq_flag(IRQF_PROBE_SHARED)
74#define SA_PERCPU deprecated_irq_flag(IRQF_PERCPU)
75
76#define SA_TRIGGER_LOW deprecated_irq_flag(IRQF_TRIGGER_LOW)
77#define SA_TRIGGER_HIGH deprecated_irq_flag(IRQF_TRIGGER_HIGH)
78#define SA_TRIGGER_FALLING deprecated_irq_flag(IRQF_TRIGGER_FALLING)
79#define SA_TRIGGER_RISING deprecated_irq_flag(IRQF_TRIGGER_RISING)
80#define SA_TRIGGER_MASK deprecated_irq_flag(IRQF_TRIGGER_MASK)
81
82typedef irqreturn_t (*irq_handler_t)(int, void *);
83
84struct irqaction {
85 irq_handler_t handler;
86 unsigned long flags;
87 cpumask_t mask;
88 const char *name;
89 void *dev_id;
90 struct irqaction *next;
91 int irq;
92 struct proc_dir_entry *dir;
93};
94
95extern irqreturn_t no_action(int cpl, void *dev_id);
96extern int __must_check request_irq(unsigned int, irq_handler_t handler,
97 unsigned long, const char *, void *);
98extern void free_irq(unsigned int, void *);
99
100extern int __must_check devm_request_irq(struct device *dev, unsigned int irq,
101 irq_handler_t handler, unsigned long irqflags,
102 const char *devname, void *dev_id);
103extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
104
105/*
106 * On lockdep we dont want to enable hardirqs in hardirq
107 * context. Use local_irq_enable_in_hardirq() to annotate
108 * kernel code that has to do this nevertheless (pretty much
109 * the only valid case is for old/broken hardware that is
110 * insanely slow).
111 *
112 * NOTE: in theory this might break fragile code that relies
113 * on hardirq delivery - in practice we dont seem to have such
114 * places left. So the only effect should be slightly increased
115 * irqs-off latencies.
116 */
117#ifdef CONFIG_LOCKDEP
118# define local_irq_enable_in_hardirq() do { } while (0)
119#else
120# define local_irq_enable_in_hardirq() local_irq_enable()
121#endif
122
123#ifdef CONFIG_GENERIC_HARDIRQS
124extern void disable_irq_nosync(unsigned int irq);
125extern void disable_irq(unsigned int irq);
126extern void enable_irq(unsigned int irq);
127
128/*
129 * Special lockdep variants of irq disabling/enabling.
130 * These should be used for locking constructs that
131 * know that a particular irq context which is disabled,
132 * and which is the only irq-context user of a lock,
133 * that it's safe to take the lock in the irq-disabled
134 * section without disabling hardirqs.
135 *
136 * On !CONFIG_LOCKDEP they are equivalent to the normal
137 * irq disable/enable methods.
138 */
139static inline void disable_irq_nosync_lockdep(unsigned int irq)
140{
141 disable_irq_nosync(irq);
142#ifdef CONFIG_LOCKDEP
143 local_irq_disable();
144#endif
145}
146
147static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
148{
149 disable_irq_nosync(irq);
150#ifdef CONFIG_LOCKDEP
151 local_irq_save(*flags);
152#endif
153}
154
155static inline void disable_irq_lockdep(unsigned int irq)
156{
157 disable_irq(irq);
158#ifdef CONFIG_LOCKDEP
159 local_irq_disable();
160#endif
161}
162
163static inline void enable_irq_lockdep(unsigned int irq)
164{
165#ifdef CONFIG_LOCKDEP
166 local_irq_enable();
167#endif
168 enable_irq(irq);
169}
170
171static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
172{
173#ifdef CONFIG_LOCKDEP
174 local_irq_restore(*flags);
175#endif
176 enable_irq(irq);
177}
178
179/* IRQ wakeup (PM) control: */
180extern int set_irq_wake(unsigned int irq, unsigned int on);
181
182static inline int enable_irq_wake(unsigned int irq)
183{
184 return set_irq_wake(irq, 1);
185}
186
187static inline int disable_irq_wake(unsigned int irq)
188{
189 return set_irq_wake(irq, 0);
190}
191
192#else /* !CONFIG_GENERIC_HARDIRQS */
193/*
194 * NOTE: non-genirq architectures, if they want to support the lock
195 * validator need to define the methods below in their asm/irq.h
196 * files, under an #ifdef CONFIG_LOCKDEP section.
197 */
198#ifndef CONFIG_LOCKDEP
199# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
200# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
201 disable_irq_nosync(irq)
202# define disable_irq_lockdep(irq) disable_irq(irq)
203# define enable_irq_lockdep(irq) enable_irq(irq)
204# define enable_irq_lockdep_irqrestore(irq, flags) \
205 enable_irq(irq)
206# endif
207
208#endif /* CONFIG_GENERIC_HARDIRQS */
209
210#ifndef __ARCH_SET_SOFTIRQ_PENDING
211#define set_softirq_pending(x) (local_softirq_pending() = (x))
212#define or_softirq_pending(x) (local_softirq_pending() |= (x))
213#endif
214
215/*
216 * Temporary defines for UP kernels, until all code gets fixed.
217 */
218#ifndef CONFIG_SMP
219static inline void __deprecated cli(void)
220{
221 local_irq_disable();
222}
223static inline void __deprecated sti(void)
224{
225 local_irq_enable();
226}
227static inline void __deprecated save_flags(unsigned long *x)
228{
229 local_save_flags(*x);
230}
231#define save_flags(x) save_flags(&x)
232static inline void __deprecated restore_flags(unsigned long x)
233{
234 local_irq_restore(x);
235}
236
237static inline void __deprecated save_and_cli(unsigned long *x)
238{
239 local_irq_save(*x);
240}
241#define save_and_cli(x) save_and_cli(&x)
242#endif /* CONFIG_SMP */
243
244/* Some architectures might implement lazy enabling/disabling of
245 * interrupts. In some cases, such as stop_machine, we might want
246 * to ensure that after a local_irq_disable(), interrupts have
247 * really been disabled in hardware. Such architectures need to
248 * implement the following hook.
249 */
250#ifndef hard_irq_disable
251#define hard_irq_disable() do { } while(0)
252#endif
253
254/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
255 frequency threaded job scheduling. For almost all the purposes
256 tasklets are more than enough. F.e. all serial device BHs et
257 al. should be converted to tasklets, not to softirqs.
258 */
259
260enum
261{
262 HI_SOFTIRQ=0,
263 TIMER_SOFTIRQ,
264 NET_TX_SOFTIRQ,
265 NET_RX_SOFTIRQ,
266 BLOCK_SOFTIRQ,
267 TASKLET_SOFTIRQ,
268 SCHED_SOFTIRQ,
269#ifdef CONFIG_HIGH_RES_TIMERS
270 HRTIMER_SOFTIRQ,
271#endif
272};
273
274/* softirq mask and active fields moved to irq_cpustat_t in
275 * asm/hardirq.h to get better cache usage. KAO
276 */
277
278struct softirq_action
279{
280 void (*action)(struct softirq_action *);
281 void *data;
282};
283
284asmlinkage void do_softirq(void);
285extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
286extern void softirq_init(void);
287#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
288extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
289extern void FASTCALL(raise_softirq(unsigned int nr));
290
291
292/* Tasklets --- multithreaded analogue of BHs.
293
294 Main feature differing them of generic softirqs: tasklet
295 is running only on one CPU simultaneously.
296
297 Main feature differing them of BHs: different tasklets
298 may be run simultaneously on different CPUs.
299
300 Properties:
301 * If tasklet_schedule() is called, then tasklet is guaranteed
302 to be executed on some cpu at least once after this.
303 * If the tasklet is already scheduled, but its excecution is still not
304 started, it will be executed only once.
305 * If this tasklet is already running on another CPU (or schedule is called
306 from tasklet itself), it is rescheduled for later.
307 * Tasklet is strictly serialized wrt itself, but not
308 wrt another tasklets. If client needs some intertask synchronization,
309 he makes it with spinlocks.
310 */
311
312struct tasklet_struct
313{
314 struct tasklet_struct *next;
315 unsigned long state;
316 atomic_t count;
317 void (*func)(unsigned long);
318 unsigned long data;
319};
320
321#define DECLARE_TASKLET(name, func, data) \
322struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
323
324#define DECLARE_TASKLET_DISABLED(name, func, data) \
325struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
326
327
328enum
329{
330 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
331 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
332};
333
334#ifdef CONFIG_SMP
335static inline int tasklet_trylock(struct tasklet_struct *t)
336{
337 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
338}
339
340static inline void tasklet_unlock(struct tasklet_struct *t)
341{
342 smp_mb__before_clear_bit();
343 clear_bit(TASKLET_STATE_RUN, &(t)->state);
344}
345
346static inline void tasklet_unlock_wait(struct tasklet_struct *t)
347{
348 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
349}
350#else
351#define tasklet_trylock(t) 1
352#define tasklet_unlock_wait(t) do { } while (0)
353#define tasklet_unlock(t) do { } while (0)
354#endif
355
356extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
357
358static inline void tasklet_schedule(struct tasklet_struct *t)
359{
360 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
361 __tasklet_schedule(t);
362}
363
364extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
365
366static inline void tasklet_hi_schedule(struct tasklet_struct *t)
367{
368 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
369 __tasklet_hi_schedule(t);
370}
371
372
373static inline void tasklet_disable_nosync(struct tasklet_struct *t)
374{
375 atomic_inc(&t->count);
376 smp_mb__after_atomic_inc();
377}
378
379static inline void tasklet_disable(struct tasklet_struct *t)
380{
381 tasklet_disable_nosync(t);
382 tasklet_unlock_wait(t);
383 smp_mb();
384}
385
386static inline void tasklet_enable(struct tasklet_struct *t)
387{
388 smp_mb__before_atomic_dec();
389 atomic_dec(&t->count);
390}
391
392static inline void tasklet_hi_enable(struct tasklet_struct *t)
393{
394 smp_mb__before_atomic_dec();
395 atomic_dec(&t->count);
396}
397
398extern void tasklet_kill(struct tasklet_struct *t);
399extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
400extern void tasklet_init(struct tasklet_struct *t,
401 void (*func)(unsigned long), unsigned long data);
402
403/*
404 * Autoprobing for irqs:
405 *
406 * probe_irq_on() and probe_irq_off() provide robust primitives
407 * for accurate IRQ probing during kernel initialization. They are
408 * reasonably simple to use, are not "fooled" by spurious interrupts,
409 * and, unlike other attempts at IRQ probing, they do not get hung on
410 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
411 *
412 * For reasonably foolproof probing, use them as follows:
413 *
414 * 1. clear and/or mask the device's internal interrupt.
415 * 2. sti();
416 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
417 * 4. enable the device and cause it to trigger an interrupt.
418 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
419 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
420 * 7. service the device to clear its pending interrupt.
421 * 8. loop again if paranoia is required.
422 *
423 * probe_irq_on() returns a mask of allocated irq's.
424 *
425 * probe_irq_off() takes the mask as a parameter,
426 * and returns the irq number which occurred,
427 * or zero if none occurred, or a negative irq number
428 * if more than one irq occurred.
429 */
430
431#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
432static inline unsigned long probe_irq_on(void)
433{
434 return 0;
435}
436static inline int probe_irq_off(unsigned long val)
437{
438 return 0;
439}
440static inline unsigned int probe_irq_mask(unsigned long val)
441{
442 return 0;
443}
444#else
445extern unsigned long probe_irq_on(void); /* returns 0 on failure */
446extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
447extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
448#endif
449
450#ifdef CONFIG_PROC_FS
451/* Initialize /proc/irq/ */
452extern void init_irq_proc(void);
453#else
454static inline void init_irq_proc(void)
455{
456}
457#endif
458
459#endif