Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* interrupt.h */ |
2 | #ifndef _LINUX_INTERRUPT_H | |
3 | #define _LINUX_INTERRUPT_H | |
4 | ||
1da177e4 LT |
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> | |
908dcecd | 10 | #include <linux/irqreturn.h> |
dd3a1db9 | 11 | #include <linux/irqnr.h> |
1da177e4 | 12 | #include <linux/hardirq.h> |
f037360f | 13 | #include <linux/sched.h> |
de30a2b3 | 14 | #include <linux/irqflags.h> |
54514a70 DM |
15 | #include <linux/smp.h> |
16 | #include <linux/percpu.h> | |
0ebb26e7 | 17 | |
1da177e4 LT |
18 | #include <asm/atomic.h> |
19 | #include <asm/ptrace.h> | |
20 | #include <asm/system.h> | |
21 | ||
6e213616 TG |
22 | /* |
23 | * These correspond to the IORESOURCE_IRQ_* defines in | |
24 | * linux/ioport.h to select the interrupt line behaviour. When | |
25 | * requesting an interrupt without specifying a IRQF_TRIGGER, the | |
26 | * setting should be assumed to be "as already configured", which | |
27 | * may be as per machine or firmware initialisation. | |
28 | */ | |
29 | #define IRQF_TRIGGER_NONE 0x00000000 | |
30 | #define IRQF_TRIGGER_RISING 0x00000001 | |
31 | #define IRQF_TRIGGER_FALLING 0x00000002 | |
32 | #define IRQF_TRIGGER_HIGH 0x00000004 | |
33 | #define IRQF_TRIGGER_LOW 0x00000008 | |
34 | #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \ | |
35 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING) | |
36 | #define IRQF_TRIGGER_PROBE 0x00000010 | |
37 | ||
38 | /* | |
39 | * These flags used only by the kernel as part of the | |
40 | * irq handling routines. | |
41 | * | |
42 | * IRQF_DISABLED - keep irqs disabled when calling the action handler | |
43 | * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator | |
44 | * IRQF_SHARED - allow sharing the irq among several devices | |
45 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur | |
46 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt | |
950f4427 TG |
47 | * IRQF_PERCPU - Interrupt is per cpu |
48 | * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing | |
d85a60d8 BW |
49 | * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is |
50 | * registered first in an shared interrupt is considered for | |
51 | * performance reasons) | |
6e213616 TG |
52 | */ |
53 | #define IRQF_DISABLED 0x00000020 | |
54 | #define IRQF_SAMPLE_RANDOM 0x00000040 | |
55 | #define IRQF_SHARED 0x00000080 | |
56 | #define IRQF_PROBE_SHARED 0x00000100 | |
57 | #define IRQF_TIMER 0x00000200 | |
284c6680 | 58 | #define IRQF_PERCPU 0x00000400 |
950f4427 | 59 | #define IRQF_NOBALANCING 0x00000800 |
d85a60d8 | 60 | #define IRQF_IRQPOLL 0x00001000 |
6e213616 | 61 | |
3aa551c9 TG |
62 | /* |
63 | * Bits used by threaded handlers: | |
64 | * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run | |
65 | * IRQTF_DIED - handler thread died | |
f48fe81e | 66 | * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed |
3aa551c9 TG |
67 | */ |
68 | enum { | |
69 | IRQTF_RUNTHREAD, | |
70 | IRQTF_DIED, | |
f48fe81e | 71 | IRQTF_WARNED, |
3aa551c9 TG |
72 | }; |
73 | ||
7d12e780 | 74 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 75 | |
a9d0a1a3 TG |
76 | /** |
77 | * struct irqaction - per interrupt action descriptor | |
78 | * @handler: interrupt handler function | |
79 | * @flags: flags (see IRQF_* above) | |
80 | * @mask: no comment as it is useless and about to be removed | |
81 | * @name: name of the device | |
82 | * @dev_id: cookie to identify the device | |
83 | * @next: pointer to the next irqaction for shared interrupts | |
84 | * @irq: interrupt number | |
85 | * @dir: pointer to the proc/irq/NN/name entry | |
3aa551c9 TG |
86 | * @thread_fn: interupt handler function for threaded interrupts |
87 | * @thread: thread pointer for threaded interrupts | |
88 | * @thread_flags: flags related to @thread | |
a9d0a1a3 | 89 | */ |
1da177e4 | 90 | struct irqaction { |
da482792 | 91 | irq_handler_t handler; |
1da177e4 LT |
92 | unsigned long flags; |
93 | cpumask_t mask; | |
94 | const char *name; | |
95 | void *dev_id; | |
96 | struct irqaction *next; | |
97 | int irq; | |
98 | struct proc_dir_entry *dir; | |
3aa551c9 TG |
99 | irq_handler_t thread_fn; |
100 | struct task_struct *thread; | |
101 | unsigned long thread_flags; | |
1da177e4 LT |
102 | }; |
103 | ||
7d12e780 | 104 | extern irqreturn_t no_action(int cpl, void *dev_id); |
3aa551c9 | 105 | |
3a38148f | 106 | #ifdef CONFIG_GENERIC_HARDIRQS |
3aa551c9 TG |
107 | extern int __must_check |
108 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
109 | irq_handler_t thread_fn, | |
110 | unsigned long flags, const char *name, void *dev); | |
111 | ||
112 | static inline int __must_check | |
113 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
114 | const char *name, void *dev) | |
115 | { | |
116 | return request_threaded_irq(irq, handler, NULL, flags, name, dev); | |
117 | } | |
118 | ||
3aa551c9 TG |
119 | extern void exit_irq_thread(void); |
120 | #else | |
3a38148f TG |
121 | |
122 | extern int __must_check | |
123 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
124 | const char *name, void *dev); | |
125 | ||
de18836e TG |
126 | /* |
127 | * Special function to avoid ifdeffery in kernel/irq/devres.c which | |
128 | * gets magically built by GENERIC_HARDIRQS=n architectures (sparc, | |
129 | * m68k). I really love these $@%#!* obvious Makefile references: | |
130 | * ../../../kernel/irq/devres.o | |
131 | */ | |
132 | static inline int __must_check | |
133 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
134 | irq_handler_t thread_fn, | |
135 | unsigned long flags, const char *name, void *dev) | |
136 | { | |
137 | return request_irq(irq, handler, flags, name, dev); | |
138 | } | |
139 | ||
3aa551c9 TG |
140 | static inline void exit_irq_thread(void) { } |
141 | #endif | |
142 | ||
1da177e4 LT |
143 | extern void free_irq(unsigned int, void *); |
144 | ||
0af3678f AV |
145 | struct device; |
146 | ||
935bd5b9 AV |
147 | extern int __must_check |
148 | devm_request_threaded_irq(struct device *dev, unsigned int irq, | |
149 | irq_handler_t handler, irq_handler_t thread_fn, | |
150 | unsigned long irqflags, const char *devname, | |
151 | void *dev_id); | |
152 | ||
153 | static inline int __must_check | |
154 | devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, | |
155 | unsigned long irqflags, const char *devname, void *dev_id) | |
156 | { | |
157 | return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, | |
158 | devname, dev_id); | |
159 | } | |
160 | ||
9ac7849e TH |
161 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); |
162 | ||
d7e9629d IM |
163 | /* |
164 | * On lockdep we dont want to enable hardirqs in hardirq | |
165 | * context. Use local_irq_enable_in_hardirq() to annotate | |
166 | * kernel code that has to do this nevertheless (pretty much | |
167 | * the only valid case is for old/broken hardware that is | |
168 | * insanely slow). | |
169 | * | |
170 | * NOTE: in theory this might break fragile code that relies | |
171 | * on hardirq delivery - in practice we dont seem to have such | |
172 | * places left. So the only effect should be slightly increased | |
173 | * irqs-off latencies. | |
174 | */ | |
175 | #ifdef CONFIG_LOCKDEP | |
176 | # define local_irq_enable_in_hardirq() do { } while (0) | |
177 | #else | |
178 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
179 | #endif | |
1da177e4 | 180 | |
1da177e4 LT |
181 | extern void disable_irq_nosync(unsigned int irq); |
182 | extern void disable_irq(unsigned int irq); | |
183 | extern void enable_irq(unsigned int irq); | |
ba9a2331 | 184 | |
0a0c5168 RW |
185 | /* The following three functions are for the core kernel use only. */ |
186 | extern void suspend_device_irqs(void); | |
187 | extern void resume_device_irqs(void); | |
188 | #ifdef CONFIG_PM_SLEEP | |
189 | extern int check_wakeup_irqs(void); | |
190 | #else | |
191 | static inline int check_wakeup_irqs(void) { return 0; } | |
192 | #endif | |
193 | ||
d7b90689 RK |
194 | #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS) |
195 | ||
d036e67b | 196 | extern cpumask_var_t irq_default_affinity; |
18404756 | 197 | |
0de26520 | 198 | extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask); |
d7b90689 | 199 | extern int irq_can_set_affinity(unsigned int irq); |
18404756 | 200 | extern int irq_select_affinity(unsigned int irq); |
d7b90689 RK |
201 | |
202 | #else /* CONFIG_SMP */ | |
203 | ||
0de26520 | 204 | static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) |
d7b90689 RK |
205 | { |
206 | return -EINVAL; | |
207 | } | |
208 | ||
209 | static inline int irq_can_set_affinity(unsigned int irq) | |
210 | { | |
211 | return 0; | |
212 | } | |
213 | ||
18404756 MK |
214 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
215 | ||
d7b90689 RK |
216 | #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */ |
217 | ||
e9ed7e72 | 218 | #ifdef CONFIG_GENERIC_HARDIRQS |
c01d403b IM |
219 | /* |
220 | * Special lockdep variants of irq disabling/enabling. | |
221 | * These should be used for locking constructs that | |
222 | * know that a particular irq context which is disabled, | |
223 | * and which is the only irq-context user of a lock, | |
224 | * that it's safe to take the lock in the irq-disabled | |
225 | * section without disabling hardirqs. | |
226 | * | |
227 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
228 | * irq disable/enable methods. | |
229 | */ | |
230 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
231 | { | |
232 | disable_irq_nosync(irq); | |
233 | #ifdef CONFIG_LOCKDEP | |
234 | local_irq_disable(); | |
235 | #endif | |
236 | } | |
237 | ||
e8106b94 AV |
238 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
239 | { | |
240 | disable_irq_nosync(irq); | |
241 | #ifdef CONFIG_LOCKDEP | |
242 | local_irq_save(*flags); | |
243 | #endif | |
244 | } | |
245 | ||
c01d403b IM |
246 | static inline void disable_irq_lockdep(unsigned int irq) |
247 | { | |
248 | disable_irq(irq); | |
249 | #ifdef CONFIG_LOCKDEP | |
250 | local_irq_disable(); | |
251 | #endif | |
252 | } | |
253 | ||
254 | static inline void enable_irq_lockdep(unsigned int irq) | |
255 | { | |
256 | #ifdef CONFIG_LOCKDEP | |
257 | local_irq_enable(); | |
258 | #endif | |
259 | enable_irq(irq); | |
260 | } | |
261 | ||
e8106b94 AV |
262 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
263 | { | |
264 | #ifdef CONFIG_LOCKDEP | |
265 | local_irq_restore(*flags); | |
266 | #endif | |
267 | enable_irq(irq); | |
268 | } | |
269 | ||
ba9a2331 TG |
270 | /* IRQ wakeup (PM) control: */ |
271 | extern int set_irq_wake(unsigned int irq, unsigned int on); | |
272 | ||
273 | static inline int enable_irq_wake(unsigned int irq) | |
274 | { | |
275 | return set_irq_wake(irq, 1); | |
276 | } | |
277 | ||
278 | static inline int disable_irq_wake(unsigned int irq) | |
279 | { | |
280 | return set_irq_wake(irq, 0); | |
281 | } | |
282 | ||
c01d403b IM |
283 | #else /* !CONFIG_GENERIC_HARDIRQS */ |
284 | /* | |
285 | * NOTE: non-genirq architectures, if they want to support the lock | |
286 | * validator need to define the methods below in their asm/irq.h | |
287 | * files, under an #ifdef CONFIG_LOCKDEP section. | |
288 | */ | |
b3e2fd9c | 289 | #ifndef CONFIG_LOCKDEP |
c01d403b | 290 | # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq) |
b3e2fd9c RZ |
291 | # define disable_irq_nosync_lockdep_irqsave(irq, flags) \ |
292 | disable_irq_nosync(irq) | |
c01d403b IM |
293 | # define disable_irq_lockdep(irq) disable_irq(irq) |
294 | # define enable_irq_lockdep(irq) enable_irq(irq) | |
b3e2fd9c RZ |
295 | # define enable_irq_lockdep_irqrestore(irq, flags) \ |
296 | enable_irq(irq) | |
c01d403b IM |
297 | # endif |
298 | ||
aa5346a2 GL |
299 | static inline int enable_irq_wake(unsigned int irq) |
300 | { | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static inline int disable_irq_wake(unsigned int irq) | |
305 | { | |
306 | return 0; | |
307 | } | |
c01d403b | 308 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 309 | |
3f74478b AK |
310 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
311 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
312 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
313 | #endif | |
314 | ||
2d3fbbb3 BH |
315 | /* Some architectures might implement lazy enabling/disabling of |
316 | * interrupts. In some cases, such as stop_machine, we might want | |
317 | * to ensure that after a local_irq_disable(), interrupts have | |
318 | * really been disabled in hardware. Such architectures need to | |
319 | * implement the following hook. | |
320 | */ | |
321 | #ifndef hard_irq_disable | |
322 | #define hard_irq_disable() do { } while(0) | |
323 | #endif | |
324 | ||
1da177e4 LT |
325 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
326 | frequency threaded job scheduling. For almost all the purposes | |
327 | tasklets are more than enough. F.e. all serial device BHs et | |
328 | al. should be converted to tasklets, not to softirqs. | |
329 | */ | |
330 | ||
331 | enum | |
332 | { | |
333 | HI_SOFTIRQ=0, | |
334 | TIMER_SOFTIRQ, | |
335 | NET_TX_SOFTIRQ, | |
336 | NET_RX_SOFTIRQ, | |
ff856bad | 337 | BLOCK_SOFTIRQ, |
c9819f45 CL |
338 | TASKLET_SOFTIRQ, |
339 | SCHED_SOFTIRQ, | |
a6037b61 PZ |
340 | HRTIMER_SOFTIRQ, |
341 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ | |
978b0116 AD |
342 | |
343 | NR_SOFTIRQS | |
1da177e4 LT |
344 | }; |
345 | ||
5d592b44 JB |
346 | /* map softirq index to softirq name. update 'softirq_to_name' in |
347 | * kernel/softirq.c when adding a new softirq. | |
348 | */ | |
349 | extern char *softirq_to_name[NR_SOFTIRQS]; | |
350 | ||
1da177e4 LT |
351 | /* softirq mask and active fields moved to irq_cpustat_t in |
352 | * asm/hardirq.h to get better cache usage. KAO | |
353 | */ | |
354 | ||
355 | struct softirq_action | |
356 | { | |
357 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
358 | }; |
359 | ||
360 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 361 | asmlinkage void __do_softirq(void); |
962cf36c | 362 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
1da177e4 | 363 | extern void softirq_init(void); |
3f74478b | 364 | #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) |
b3c97528 HH |
365 | extern void raise_softirq_irqoff(unsigned int nr); |
366 | extern void raise_softirq(unsigned int nr); | |
7f1e2ca9 | 367 | extern void wakeup_softirqd(void); |
1da177e4 | 368 | |
54514a70 DM |
369 | /* This is the worklist that queues up per-cpu softirq work. |
370 | * | |
371 | * send_remote_sendirq() adds work to these lists, and | |
372 | * the softirq handler itself dequeues from them. The queues | |
373 | * are protected by disabling local cpu interrupts and they must | |
374 | * only be accessed by the local cpu that they are for. | |
375 | */ | |
376 | DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list); | |
377 | ||
378 | /* Try to send a softirq to a remote cpu. If this cannot be done, the | |
379 | * work will be queued to the local cpu. | |
380 | */ | |
381 | extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq); | |
382 | ||
383 | /* Like send_remote_softirq(), but the caller must disable local cpu interrupts | |
384 | * and compute the current cpu, passed in as 'this_cpu'. | |
385 | */ | |
386 | extern void __send_remote_softirq(struct call_single_data *cp, int cpu, | |
387 | int this_cpu, int softirq); | |
1da177e4 LT |
388 | |
389 | /* Tasklets --- multithreaded analogue of BHs. | |
390 | ||
391 | Main feature differing them of generic softirqs: tasklet | |
392 | is running only on one CPU simultaneously. | |
393 | ||
394 | Main feature differing them of BHs: different tasklets | |
395 | may be run simultaneously on different CPUs. | |
396 | ||
397 | Properties: | |
398 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
399 | to be executed on some cpu at least once after this. | |
400 | * If the tasklet is already scheduled, but its excecution is still not | |
401 | started, it will be executed only once. | |
402 | * If this tasklet is already running on another CPU (or schedule is called | |
403 | from tasklet itself), it is rescheduled for later. | |
404 | * Tasklet is strictly serialized wrt itself, but not | |
405 | wrt another tasklets. If client needs some intertask synchronization, | |
406 | he makes it with spinlocks. | |
407 | */ | |
408 | ||
409 | struct tasklet_struct | |
410 | { | |
411 | struct tasklet_struct *next; | |
412 | unsigned long state; | |
413 | atomic_t count; | |
414 | void (*func)(unsigned long); | |
415 | unsigned long data; | |
416 | }; | |
417 | ||
418 | #define DECLARE_TASKLET(name, func, data) \ | |
419 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
420 | ||
421 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
422 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
423 | ||
424 | ||
425 | enum | |
426 | { | |
427 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
428 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
429 | }; | |
430 | ||
431 | #ifdef CONFIG_SMP | |
432 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
433 | { | |
434 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
435 | } | |
436 | ||
437 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
438 | { | |
439 | smp_mb__before_clear_bit(); | |
440 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
441 | } | |
442 | ||
443 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
444 | { | |
445 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
446 | } | |
447 | #else | |
448 | #define tasklet_trylock(t) 1 | |
449 | #define tasklet_unlock_wait(t) do { } while (0) | |
450 | #define tasklet_unlock(t) do { } while (0) | |
451 | #endif | |
452 | ||
b3c97528 | 453 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
454 | |
455 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
456 | { | |
457 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
458 | __tasklet_schedule(t); | |
459 | } | |
460 | ||
b3c97528 | 461 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
462 | |
463 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
464 | { | |
465 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
466 | __tasklet_hi_schedule(t); | |
467 | } | |
468 | ||
469 | ||
470 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
471 | { | |
472 | atomic_inc(&t->count); | |
473 | smp_mb__after_atomic_inc(); | |
474 | } | |
475 | ||
476 | static inline void tasklet_disable(struct tasklet_struct *t) | |
477 | { | |
478 | tasklet_disable_nosync(t); | |
479 | tasklet_unlock_wait(t); | |
480 | smp_mb(); | |
481 | } | |
482 | ||
483 | static inline void tasklet_enable(struct tasklet_struct *t) | |
484 | { | |
485 | smp_mb__before_atomic_dec(); | |
486 | atomic_dec(&t->count); | |
487 | } | |
488 | ||
489 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
490 | { | |
491 | smp_mb__before_atomic_dec(); | |
492 | atomic_dec(&t->count); | |
493 | } | |
494 | ||
495 | extern void tasklet_kill(struct tasklet_struct *t); | |
496 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
497 | extern void tasklet_init(struct tasklet_struct *t, | |
498 | void (*func)(unsigned long), unsigned long data); | |
499 | ||
500 | /* | |
501 | * Autoprobing for irqs: | |
502 | * | |
503 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
504 | * for accurate IRQ probing during kernel initialization. They are | |
505 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
506 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
507 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
508 | * | |
509 | * For reasonably foolproof probing, use them as follows: | |
510 | * | |
511 | * 1. clear and/or mask the device's internal interrupt. | |
512 | * 2. sti(); | |
513 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
514 | * 4. enable the device and cause it to trigger an interrupt. | |
515 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
516 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
517 | * 7. service the device to clear its pending interrupt. | |
518 | * 8. loop again if paranoia is required. | |
519 | * | |
520 | * probe_irq_on() returns a mask of allocated irq's. | |
521 | * | |
522 | * probe_irq_off() takes the mask as a parameter, | |
523 | * and returns the irq number which occurred, | |
524 | * or zero if none occurred, or a negative irq number | |
525 | * if more than one irq occurred. | |
526 | */ | |
527 | ||
528 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
529 | static inline unsigned long probe_irq_on(void) | |
530 | { | |
531 | return 0; | |
532 | } | |
533 | static inline int probe_irq_off(unsigned long val) | |
534 | { | |
535 | return 0; | |
536 | } | |
537 | static inline unsigned int probe_irq_mask(unsigned long val) | |
538 | { | |
539 | return 0; | |
540 | } | |
541 | #else | |
542 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
543 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
544 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
545 | #endif | |
546 | ||
6168a702 AM |
547 | #ifdef CONFIG_PROC_FS |
548 | /* Initialize /proc/irq/ */ | |
549 | extern void init_irq_proc(void); | |
550 | #else | |
551 | static inline void init_irq_proc(void) | |
552 | { | |
553 | } | |
554 | #endif | |
555 | ||
74296a8e IM |
556 | #if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ) |
557 | extern void debug_poll_all_shared_irqs(void); | |
558 | #else | |
559 | static inline void debug_poll_all_shared_irqs(void) { } | |
560 | #endif | |
561 | ||
f74596d0 AB |
562 | int show_interrupts(struct seq_file *p, void *v); |
563 | ||
43a25632 YL |
564 | struct irq_desc; |
565 | ||
566 | extern int early_irq_init(void); | |
4a046d17 | 567 | extern int arch_probe_nr_irqs(void); |
43a25632 YL |
568 | extern int arch_early_irq_init(void); |
569 | extern int arch_init_chip_data(struct irq_desc *desc, int cpu); | |
570 | ||
1da177e4 | 571 | #endif |