Commit | Line | Data |
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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> | |
9ba5f005 | 17 | #include <linux/hrtimer.h> |
0ebb26e7 | 18 | |
1da177e4 LT |
19 | #include <asm/atomic.h> |
20 | #include <asm/ptrace.h> | |
21 | #include <asm/system.h> | |
22 | ||
6e213616 TG |
23 | /* |
24 | * These correspond to the IORESOURCE_IRQ_* defines in | |
25 | * linux/ioport.h to select the interrupt line behaviour. When | |
26 | * requesting an interrupt without specifying a IRQF_TRIGGER, the | |
27 | * setting should be assumed to be "as already configured", which | |
28 | * may be as per machine or firmware initialisation. | |
29 | */ | |
30 | #define IRQF_TRIGGER_NONE 0x00000000 | |
31 | #define IRQF_TRIGGER_RISING 0x00000001 | |
32 | #define IRQF_TRIGGER_FALLING 0x00000002 | |
33 | #define IRQF_TRIGGER_HIGH 0x00000004 | |
34 | #define IRQF_TRIGGER_LOW 0x00000008 | |
35 | #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \ | |
36 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING) | |
37 | #define IRQF_TRIGGER_PROBE 0x00000010 | |
38 | ||
39 | /* | |
40 | * These flags used only by the kernel as part of the | |
41 | * irq handling routines. | |
42 | * | |
43 | * IRQF_DISABLED - keep irqs disabled when calling the action handler | |
44 | * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator | |
45 | * IRQF_SHARED - allow sharing the irq among several devices | |
46 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur | |
47 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt | |
950f4427 TG |
48 | * IRQF_PERCPU - Interrupt is per cpu |
49 | * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing | |
d85a60d8 BW |
50 | * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is |
51 | * registered first in an shared interrupt is considered for | |
52 | * performance reasons) | |
6e213616 TG |
53 | */ |
54 | #define IRQF_DISABLED 0x00000020 | |
55 | #define IRQF_SAMPLE_RANDOM 0x00000040 | |
56 | #define IRQF_SHARED 0x00000080 | |
57 | #define IRQF_PROBE_SHARED 0x00000100 | |
58 | #define IRQF_TIMER 0x00000200 | |
284c6680 | 59 | #define IRQF_PERCPU 0x00000400 |
950f4427 | 60 | #define IRQF_NOBALANCING 0x00000800 |
d85a60d8 | 61 | #define IRQF_IRQPOLL 0x00001000 |
6e213616 | 62 | |
3aa551c9 TG |
63 | /* |
64 | * Bits used by threaded handlers: | |
65 | * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run | |
66 | * IRQTF_DIED - handler thread died | |
f48fe81e | 67 | * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed |
3aa551c9 TG |
68 | */ |
69 | enum { | |
70 | IRQTF_RUNTHREAD, | |
71 | IRQTF_DIED, | |
f48fe81e | 72 | IRQTF_WARNED, |
3aa551c9 TG |
73 | }; |
74 | ||
7d12e780 | 75 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 76 | |
a9d0a1a3 TG |
77 | /** |
78 | * struct irqaction - per interrupt action descriptor | |
79 | * @handler: interrupt handler function | |
80 | * @flags: flags (see IRQF_* above) | |
81 | * @mask: no comment as it is useless and about to be removed | |
82 | * @name: name of the device | |
83 | * @dev_id: cookie to identify the device | |
84 | * @next: pointer to the next irqaction for shared interrupts | |
85 | * @irq: interrupt number | |
86 | * @dir: pointer to the proc/irq/NN/name entry | |
3aa551c9 TG |
87 | * @thread_fn: interupt handler function for threaded interrupts |
88 | * @thread: thread pointer for threaded interrupts | |
89 | * @thread_flags: flags related to @thread | |
a9d0a1a3 | 90 | */ |
1da177e4 | 91 | struct irqaction { |
da482792 | 92 | irq_handler_t handler; |
1da177e4 LT |
93 | unsigned long flags; |
94 | cpumask_t mask; | |
95 | const char *name; | |
96 | void *dev_id; | |
97 | struct irqaction *next; | |
98 | int irq; | |
99 | struct proc_dir_entry *dir; | |
3aa551c9 TG |
100 | irq_handler_t thread_fn; |
101 | struct task_struct *thread; | |
102 | unsigned long thread_flags; | |
1da177e4 LT |
103 | }; |
104 | ||
7d12e780 | 105 | extern irqreturn_t no_action(int cpl, void *dev_id); |
3aa551c9 | 106 | |
3a38148f | 107 | #ifdef CONFIG_GENERIC_HARDIRQS |
3aa551c9 TG |
108 | extern int __must_check |
109 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
110 | irq_handler_t thread_fn, | |
111 | unsigned long flags, const char *name, void *dev); | |
112 | ||
113 | static inline int __must_check | |
114 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
115 | const char *name, void *dev) | |
116 | { | |
117 | return request_threaded_irq(irq, handler, NULL, flags, name, dev); | |
118 | } | |
119 | ||
3aa551c9 TG |
120 | extern void exit_irq_thread(void); |
121 | #else | |
3a38148f TG |
122 | |
123 | extern int __must_check | |
124 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
125 | const char *name, void *dev); | |
126 | ||
de18836e TG |
127 | /* |
128 | * Special function to avoid ifdeffery in kernel/irq/devres.c which | |
129 | * gets magically built by GENERIC_HARDIRQS=n architectures (sparc, | |
130 | * m68k). I really love these $@%#!* obvious Makefile references: | |
131 | * ../../../kernel/irq/devres.o | |
132 | */ | |
133 | static inline int __must_check | |
134 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
135 | irq_handler_t thread_fn, | |
136 | unsigned long flags, const char *name, void *dev) | |
137 | { | |
138 | return request_irq(irq, handler, flags, name, dev); | |
139 | } | |
140 | ||
3aa551c9 TG |
141 | static inline void exit_irq_thread(void) { } |
142 | #endif | |
143 | ||
1da177e4 LT |
144 | extern void free_irq(unsigned int, void *); |
145 | ||
0af3678f AV |
146 | struct device; |
147 | ||
935bd5b9 AV |
148 | extern int __must_check |
149 | devm_request_threaded_irq(struct device *dev, unsigned int irq, | |
150 | irq_handler_t handler, irq_handler_t thread_fn, | |
151 | unsigned long irqflags, const char *devname, | |
152 | void *dev_id); | |
153 | ||
154 | static inline int __must_check | |
155 | devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, | |
156 | unsigned long irqflags, const char *devname, void *dev_id) | |
157 | { | |
158 | return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, | |
159 | devname, dev_id); | |
160 | } | |
161 | ||
9ac7849e TH |
162 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); |
163 | ||
d7e9629d IM |
164 | /* |
165 | * On lockdep we dont want to enable hardirqs in hardirq | |
166 | * context. Use local_irq_enable_in_hardirq() to annotate | |
167 | * kernel code that has to do this nevertheless (pretty much | |
168 | * the only valid case is for old/broken hardware that is | |
169 | * insanely slow). | |
170 | * | |
171 | * NOTE: in theory this might break fragile code that relies | |
172 | * on hardirq delivery - in practice we dont seem to have such | |
173 | * places left. So the only effect should be slightly increased | |
174 | * irqs-off latencies. | |
175 | */ | |
176 | #ifdef CONFIG_LOCKDEP | |
177 | # define local_irq_enable_in_hardirq() do { } while (0) | |
178 | #else | |
179 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
180 | #endif | |
1da177e4 | 181 | |
1da177e4 LT |
182 | extern void disable_irq_nosync(unsigned int irq); |
183 | extern void disable_irq(unsigned int irq); | |
184 | extern void enable_irq(unsigned int irq); | |
ba9a2331 | 185 | |
0a0c5168 | 186 | /* The following three functions are for the core kernel use only. */ |
5818a6e2 | 187 | #ifdef CONFIG_GENERIC_HARDIRQS |
0a0c5168 RW |
188 | extern void suspend_device_irqs(void); |
189 | extern void resume_device_irqs(void); | |
190 | #ifdef CONFIG_PM_SLEEP | |
191 | extern int check_wakeup_irqs(void); | |
192 | #else | |
193 | static inline int check_wakeup_irqs(void) { return 0; } | |
194 | #endif | |
5818a6e2 HC |
195 | #else |
196 | static inline void suspend_device_irqs(void) { }; | |
197 | static inline void resume_device_irqs(void) { }; | |
198 | static inline int check_wakeup_irqs(void) { return 0; } | |
0a0c5168 RW |
199 | #endif |
200 | ||
d7b90689 RK |
201 | #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS) |
202 | ||
d036e67b | 203 | extern cpumask_var_t irq_default_affinity; |
18404756 | 204 | |
0de26520 | 205 | extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask); |
d7b90689 | 206 | extern int irq_can_set_affinity(unsigned int irq); |
18404756 | 207 | extern int irq_select_affinity(unsigned int irq); |
d7b90689 RK |
208 | |
209 | #else /* CONFIG_SMP */ | |
210 | ||
0de26520 | 211 | static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) |
d7b90689 RK |
212 | { |
213 | return -EINVAL; | |
214 | } | |
215 | ||
216 | static inline int irq_can_set_affinity(unsigned int irq) | |
217 | { | |
218 | return 0; | |
219 | } | |
220 | ||
18404756 MK |
221 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
222 | ||
d7b90689 RK |
223 | #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */ |
224 | ||
e9ed7e72 | 225 | #ifdef CONFIG_GENERIC_HARDIRQS |
c01d403b IM |
226 | /* |
227 | * Special lockdep variants of irq disabling/enabling. | |
228 | * These should be used for locking constructs that | |
229 | * know that a particular irq context which is disabled, | |
230 | * and which is the only irq-context user of a lock, | |
231 | * that it's safe to take the lock in the irq-disabled | |
232 | * section without disabling hardirqs. | |
233 | * | |
234 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
235 | * irq disable/enable methods. | |
236 | */ | |
237 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
238 | { | |
239 | disable_irq_nosync(irq); | |
240 | #ifdef CONFIG_LOCKDEP | |
241 | local_irq_disable(); | |
242 | #endif | |
243 | } | |
244 | ||
e8106b94 AV |
245 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
246 | { | |
247 | disable_irq_nosync(irq); | |
248 | #ifdef CONFIG_LOCKDEP | |
249 | local_irq_save(*flags); | |
250 | #endif | |
251 | } | |
252 | ||
c01d403b IM |
253 | static inline void disable_irq_lockdep(unsigned int irq) |
254 | { | |
255 | disable_irq(irq); | |
256 | #ifdef CONFIG_LOCKDEP | |
257 | local_irq_disable(); | |
258 | #endif | |
259 | } | |
260 | ||
261 | static inline void enable_irq_lockdep(unsigned int irq) | |
262 | { | |
263 | #ifdef CONFIG_LOCKDEP | |
264 | local_irq_enable(); | |
265 | #endif | |
266 | enable_irq(irq); | |
267 | } | |
268 | ||
e8106b94 AV |
269 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
270 | { | |
271 | #ifdef CONFIG_LOCKDEP | |
272 | local_irq_restore(*flags); | |
273 | #endif | |
274 | enable_irq(irq); | |
275 | } | |
276 | ||
ba9a2331 TG |
277 | /* IRQ wakeup (PM) control: */ |
278 | extern int set_irq_wake(unsigned int irq, unsigned int on); | |
279 | ||
280 | static inline int enable_irq_wake(unsigned int irq) | |
281 | { | |
282 | return set_irq_wake(irq, 1); | |
283 | } | |
284 | ||
285 | static inline int disable_irq_wake(unsigned int irq) | |
286 | { | |
287 | return set_irq_wake(irq, 0); | |
288 | } | |
289 | ||
c01d403b IM |
290 | #else /* !CONFIG_GENERIC_HARDIRQS */ |
291 | /* | |
292 | * NOTE: non-genirq architectures, if they want to support the lock | |
293 | * validator need to define the methods below in their asm/irq.h | |
294 | * files, under an #ifdef CONFIG_LOCKDEP section. | |
295 | */ | |
b3e2fd9c | 296 | #ifndef CONFIG_LOCKDEP |
c01d403b | 297 | # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq) |
b3e2fd9c RZ |
298 | # define disable_irq_nosync_lockdep_irqsave(irq, flags) \ |
299 | disable_irq_nosync(irq) | |
c01d403b IM |
300 | # define disable_irq_lockdep(irq) disable_irq(irq) |
301 | # define enable_irq_lockdep(irq) enable_irq(irq) | |
b3e2fd9c RZ |
302 | # define enable_irq_lockdep_irqrestore(irq, flags) \ |
303 | enable_irq(irq) | |
c01d403b IM |
304 | # endif |
305 | ||
aa5346a2 GL |
306 | static inline int enable_irq_wake(unsigned int irq) |
307 | { | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static inline int disable_irq_wake(unsigned int irq) | |
312 | { | |
313 | return 0; | |
314 | } | |
c01d403b | 315 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 316 | |
3f74478b AK |
317 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
318 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
319 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
320 | #endif | |
321 | ||
2d3fbbb3 BH |
322 | /* Some architectures might implement lazy enabling/disabling of |
323 | * interrupts. In some cases, such as stop_machine, we might want | |
324 | * to ensure that after a local_irq_disable(), interrupts have | |
325 | * really been disabled in hardware. Such architectures need to | |
326 | * implement the following hook. | |
327 | */ | |
328 | #ifndef hard_irq_disable | |
329 | #define hard_irq_disable() do { } while(0) | |
330 | #endif | |
331 | ||
1da177e4 LT |
332 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
333 | frequency threaded job scheduling. For almost all the purposes | |
334 | tasklets are more than enough. F.e. all serial device BHs et | |
335 | al. should be converted to tasklets, not to softirqs. | |
336 | */ | |
337 | ||
338 | enum | |
339 | { | |
340 | HI_SOFTIRQ=0, | |
341 | TIMER_SOFTIRQ, | |
342 | NET_TX_SOFTIRQ, | |
343 | NET_RX_SOFTIRQ, | |
ff856bad | 344 | BLOCK_SOFTIRQ, |
c9819f45 CL |
345 | TASKLET_SOFTIRQ, |
346 | SCHED_SOFTIRQ, | |
a6037b61 PZ |
347 | HRTIMER_SOFTIRQ, |
348 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ | |
978b0116 AD |
349 | |
350 | NR_SOFTIRQS | |
1da177e4 LT |
351 | }; |
352 | ||
5d592b44 JB |
353 | /* map softirq index to softirq name. update 'softirq_to_name' in |
354 | * kernel/softirq.c when adding a new softirq. | |
355 | */ | |
356 | extern char *softirq_to_name[NR_SOFTIRQS]; | |
357 | ||
1da177e4 LT |
358 | /* softirq mask and active fields moved to irq_cpustat_t in |
359 | * asm/hardirq.h to get better cache usage. KAO | |
360 | */ | |
361 | ||
362 | struct softirq_action | |
363 | { | |
364 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
365 | }; |
366 | ||
367 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 368 | asmlinkage void __do_softirq(void); |
962cf36c | 369 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
1da177e4 | 370 | extern void softirq_init(void); |
3f74478b | 371 | #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) |
b3c97528 HH |
372 | extern void raise_softirq_irqoff(unsigned int nr); |
373 | extern void raise_softirq(unsigned int nr); | |
7f1e2ca9 | 374 | extern void wakeup_softirqd(void); |
1da177e4 | 375 | |
54514a70 DM |
376 | /* This is the worklist that queues up per-cpu softirq work. |
377 | * | |
378 | * send_remote_sendirq() adds work to these lists, and | |
379 | * the softirq handler itself dequeues from them. The queues | |
380 | * are protected by disabling local cpu interrupts and they must | |
381 | * only be accessed by the local cpu that they are for. | |
382 | */ | |
383 | DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list); | |
384 | ||
385 | /* Try to send a softirq to a remote cpu. If this cannot be done, the | |
386 | * work will be queued to the local cpu. | |
387 | */ | |
388 | extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq); | |
389 | ||
390 | /* Like send_remote_softirq(), but the caller must disable local cpu interrupts | |
391 | * and compute the current cpu, passed in as 'this_cpu'. | |
392 | */ | |
393 | extern void __send_remote_softirq(struct call_single_data *cp, int cpu, | |
394 | int this_cpu, int softirq); | |
1da177e4 LT |
395 | |
396 | /* Tasklets --- multithreaded analogue of BHs. | |
397 | ||
398 | Main feature differing them of generic softirqs: tasklet | |
399 | is running only on one CPU simultaneously. | |
400 | ||
401 | Main feature differing them of BHs: different tasklets | |
402 | may be run simultaneously on different CPUs. | |
403 | ||
404 | Properties: | |
405 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
406 | to be executed on some cpu at least once after this. | |
407 | * If the tasklet is already scheduled, but its excecution is still not | |
408 | started, it will be executed only once. | |
409 | * If this tasklet is already running on another CPU (or schedule is called | |
410 | from tasklet itself), it is rescheduled for later. | |
411 | * Tasklet is strictly serialized wrt itself, but not | |
412 | wrt another tasklets. If client needs some intertask synchronization, | |
413 | he makes it with spinlocks. | |
414 | */ | |
415 | ||
416 | struct tasklet_struct | |
417 | { | |
418 | struct tasklet_struct *next; | |
419 | unsigned long state; | |
420 | atomic_t count; | |
421 | void (*func)(unsigned long); | |
422 | unsigned long data; | |
423 | }; | |
424 | ||
425 | #define DECLARE_TASKLET(name, func, data) \ | |
426 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
427 | ||
428 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
429 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
430 | ||
431 | ||
432 | enum | |
433 | { | |
434 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
435 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
436 | }; | |
437 | ||
438 | #ifdef CONFIG_SMP | |
439 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
440 | { | |
441 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
442 | } | |
443 | ||
444 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
445 | { | |
446 | smp_mb__before_clear_bit(); | |
447 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
448 | } | |
449 | ||
450 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
451 | { | |
452 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
453 | } | |
454 | #else | |
455 | #define tasklet_trylock(t) 1 | |
456 | #define tasklet_unlock_wait(t) do { } while (0) | |
457 | #define tasklet_unlock(t) do { } while (0) | |
458 | #endif | |
459 | ||
b3c97528 | 460 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
461 | |
462 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
463 | { | |
464 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
465 | __tasklet_schedule(t); | |
466 | } | |
467 | ||
b3c97528 | 468 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
469 | |
470 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
471 | { | |
472 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
473 | __tasklet_hi_schedule(t); | |
474 | } | |
475 | ||
7c692cba VN |
476 | extern void __tasklet_hi_schedule_first(struct tasklet_struct *t); |
477 | ||
478 | /* | |
479 | * This version avoids touching any other tasklets. Needed for kmemcheck | |
480 | * in order not to take any page faults while enqueueing this tasklet; | |
481 | * consider VERY carefully whether you really need this or | |
482 | * tasklet_hi_schedule()... | |
483 | */ | |
484 | static inline void tasklet_hi_schedule_first(struct tasklet_struct *t) | |
485 | { | |
486 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
487 | __tasklet_hi_schedule_first(t); | |
488 | } | |
489 | ||
1da177e4 LT |
490 | |
491 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
492 | { | |
493 | atomic_inc(&t->count); | |
494 | smp_mb__after_atomic_inc(); | |
495 | } | |
496 | ||
497 | static inline void tasklet_disable(struct tasklet_struct *t) | |
498 | { | |
499 | tasklet_disable_nosync(t); | |
500 | tasklet_unlock_wait(t); | |
501 | smp_mb(); | |
502 | } | |
503 | ||
504 | static inline void tasklet_enable(struct tasklet_struct *t) | |
505 | { | |
506 | smp_mb__before_atomic_dec(); | |
507 | atomic_dec(&t->count); | |
508 | } | |
509 | ||
510 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
511 | { | |
512 | smp_mb__before_atomic_dec(); | |
513 | atomic_dec(&t->count); | |
514 | } | |
515 | ||
516 | extern void tasklet_kill(struct tasklet_struct *t); | |
517 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
518 | extern void tasklet_init(struct tasklet_struct *t, | |
519 | void (*func)(unsigned long), unsigned long data); | |
520 | ||
9ba5f005 PZ |
521 | struct tasklet_hrtimer { |
522 | struct hrtimer timer; | |
523 | struct tasklet_struct tasklet; | |
524 | enum hrtimer_restart (*function)(struct hrtimer *); | |
525 | }; | |
526 | ||
527 | extern void | |
528 | tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, | |
529 | enum hrtimer_restart (*function)(struct hrtimer *), | |
530 | clockid_t which_clock, enum hrtimer_mode mode); | |
531 | ||
532 | static inline | |
533 | int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, | |
534 | const enum hrtimer_mode mode) | |
535 | { | |
536 | return hrtimer_start(&ttimer->timer, time, mode); | |
537 | } | |
538 | ||
539 | static inline | |
540 | void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) | |
541 | { | |
542 | hrtimer_cancel(&ttimer->timer); | |
543 | tasklet_kill(&ttimer->tasklet); | |
544 | } | |
545 | ||
1da177e4 LT |
546 | /* |
547 | * Autoprobing for irqs: | |
548 | * | |
549 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
550 | * for accurate IRQ probing during kernel initialization. They are | |
551 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
552 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
553 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
554 | * | |
555 | * For reasonably foolproof probing, use them as follows: | |
556 | * | |
557 | * 1. clear and/or mask the device's internal interrupt. | |
558 | * 2. sti(); | |
559 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
560 | * 4. enable the device and cause it to trigger an interrupt. | |
561 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
562 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
563 | * 7. service the device to clear its pending interrupt. | |
564 | * 8. loop again if paranoia is required. | |
565 | * | |
566 | * probe_irq_on() returns a mask of allocated irq's. | |
567 | * | |
568 | * probe_irq_off() takes the mask as a parameter, | |
569 | * and returns the irq number which occurred, | |
570 | * or zero if none occurred, or a negative irq number | |
571 | * if more than one irq occurred. | |
572 | */ | |
573 | ||
574 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
575 | static inline unsigned long probe_irq_on(void) | |
576 | { | |
577 | return 0; | |
578 | } | |
579 | static inline int probe_irq_off(unsigned long val) | |
580 | { | |
581 | return 0; | |
582 | } | |
583 | static inline unsigned int probe_irq_mask(unsigned long val) | |
584 | { | |
585 | return 0; | |
586 | } | |
587 | #else | |
588 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
589 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
590 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
591 | #endif | |
592 | ||
6168a702 AM |
593 | #ifdef CONFIG_PROC_FS |
594 | /* Initialize /proc/irq/ */ | |
595 | extern void init_irq_proc(void); | |
596 | #else | |
597 | static inline void init_irq_proc(void) | |
598 | { | |
599 | } | |
600 | #endif | |
601 | ||
74296a8e IM |
602 | #if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ) |
603 | extern void debug_poll_all_shared_irqs(void); | |
604 | #else | |
605 | static inline void debug_poll_all_shared_irqs(void) { } | |
606 | #endif | |
607 | ||
f74596d0 AB |
608 | int show_interrupts(struct seq_file *p, void *v); |
609 | ||
43a25632 YL |
610 | struct irq_desc; |
611 | ||
612 | extern int early_irq_init(void); | |
4a046d17 | 613 | extern int arch_probe_nr_irqs(void); |
43a25632 | 614 | extern int arch_early_irq_init(void); |
85ac16d0 | 615 | extern int arch_init_chip_data(struct irq_desc *desc, int node); |
43a25632 | 616 | |
1da177e4 | 617 | #endif |