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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> |
de30a2b3 | 13 | #include <linux/irqflags.h> |
54514a70 DM |
14 | #include <linux/smp.h> |
15 | #include <linux/percpu.h> | |
9ba5f005 | 16 | #include <linux/hrtimer.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 | * | |
6932bf37 TG |
42 | * IRQF_DISABLED - keep irqs disabled when calling the action handler. |
43 | * DEPRECATED. This flag is a NOOP and scheduled to be removed | |
6e213616 TG |
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) | |
b25c340c TG |
53 | * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished. |
54 | * Used by threaded interrupts which need to keep the | |
55 | * irq line disabled until the threaded handler has been run. | |
685fd0b4 IC |
56 | * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend |
57 | * | |
6e213616 TG |
58 | */ |
59 | #define IRQF_DISABLED 0x00000020 | |
60 | #define IRQF_SAMPLE_RANDOM 0x00000040 | |
61 | #define IRQF_SHARED 0x00000080 | |
62 | #define IRQF_PROBE_SHARED 0x00000100 | |
685fd0b4 | 63 | #define __IRQF_TIMER 0x00000200 |
284c6680 | 64 | #define IRQF_PERCPU 0x00000400 |
950f4427 | 65 | #define IRQF_NOBALANCING 0x00000800 |
d85a60d8 | 66 | #define IRQF_IRQPOLL 0x00001000 |
b25c340c | 67 | #define IRQF_ONESHOT 0x00002000 |
685fd0b4 IC |
68 | #define IRQF_NO_SUSPEND 0x00004000 |
69 | ||
70 | #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND) | |
6e213616 | 71 | |
3aa551c9 TG |
72 | /* |
73 | * Bits used by threaded handlers: | |
74 | * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run | |
75 | * IRQTF_DIED - handler thread died | |
f48fe81e | 76 | * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed |
591d2fb0 | 77 | * IRQTF_AFFINITY - irq thread is requested to adjust affinity |
3aa551c9 TG |
78 | */ |
79 | enum { | |
80 | IRQTF_RUNTHREAD, | |
81 | IRQTF_DIED, | |
f48fe81e | 82 | IRQTF_WARNED, |
591d2fb0 | 83 | IRQTF_AFFINITY, |
3aa551c9 TG |
84 | }; |
85 | ||
b4e6b097 | 86 | /* |
ae731f8d MZ |
87 | * These values can be returned by request_any_context_irq() and |
88 | * describe the context the interrupt will be run in. | |
89 | * | |
90 | * IRQC_IS_HARDIRQ - interrupt runs in hardirq context | |
91 | * IRQC_IS_NESTED - interrupt runs in a nested threaded context | |
92 | */ | |
93 | enum { | |
94 | IRQC_IS_HARDIRQ = 0, | |
95 | IRQC_IS_NESTED, | |
96 | }; | |
97 | ||
7d12e780 | 98 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 99 | |
a9d0a1a3 TG |
100 | /** |
101 | * struct irqaction - per interrupt action descriptor | |
102 | * @handler: interrupt handler function | |
103 | * @flags: flags (see IRQF_* above) | |
a9d0a1a3 TG |
104 | * @name: name of the device |
105 | * @dev_id: cookie to identify the device | |
106 | * @next: pointer to the next irqaction for shared interrupts | |
107 | * @irq: interrupt number | |
108 | * @dir: pointer to the proc/irq/NN/name entry | |
3aa551c9 TG |
109 | * @thread_fn: interupt handler function for threaded interrupts |
110 | * @thread: thread pointer for threaded interrupts | |
111 | * @thread_flags: flags related to @thread | |
a9d0a1a3 | 112 | */ |
1da177e4 | 113 | struct irqaction { |
da482792 | 114 | irq_handler_t handler; |
1da177e4 | 115 | unsigned long flags; |
1da177e4 LT |
116 | const char *name; |
117 | void *dev_id; | |
118 | struct irqaction *next; | |
119 | int irq; | |
120 | struct proc_dir_entry *dir; | |
3aa551c9 TG |
121 | irq_handler_t thread_fn; |
122 | struct task_struct *thread; | |
123 | unsigned long thread_flags; | |
1da177e4 LT |
124 | }; |
125 | ||
7d12e780 | 126 | extern irqreturn_t no_action(int cpl, void *dev_id); |
3aa551c9 | 127 | |
3a38148f | 128 | #ifdef CONFIG_GENERIC_HARDIRQS |
3aa551c9 TG |
129 | extern int __must_check |
130 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
131 | irq_handler_t thread_fn, | |
132 | unsigned long flags, const char *name, void *dev); | |
133 | ||
134 | static inline int __must_check | |
135 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
136 | const char *name, void *dev) | |
137 | { | |
138 | return request_threaded_irq(irq, handler, NULL, flags, name, dev); | |
139 | } | |
140 | ||
ae731f8d MZ |
141 | extern int __must_check |
142 | request_any_context_irq(unsigned int irq, irq_handler_t handler, | |
143 | unsigned long flags, const char *name, void *dev_id); | |
144 | ||
3aa551c9 TG |
145 | extern void exit_irq_thread(void); |
146 | #else | |
3a38148f TG |
147 | |
148 | extern int __must_check | |
149 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
150 | const char *name, void *dev); | |
151 | ||
de18836e TG |
152 | /* |
153 | * Special function to avoid ifdeffery in kernel/irq/devres.c which | |
154 | * gets magically built by GENERIC_HARDIRQS=n architectures (sparc, | |
155 | * m68k). I really love these $@%#!* obvious Makefile references: | |
156 | * ../../../kernel/irq/devres.o | |
157 | */ | |
158 | static inline int __must_check | |
159 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
160 | irq_handler_t thread_fn, | |
161 | unsigned long flags, const char *name, void *dev) | |
162 | { | |
163 | return request_irq(irq, handler, flags, name, dev); | |
164 | } | |
165 | ||
ae731f8d MZ |
166 | static inline int __must_check |
167 | request_any_context_irq(unsigned int irq, irq_handler_t handler, | |
168 | unsigned long flags, const char *name, void *dev_id) | |
169 | { | |
170 | return request_irq(irq, handler, flags, name, dev_id); | |
171 | } | |
172 | ||
3aa551c9 TG |
173 | static inline void exit_irq_thread(void) { } |
174 | #endif | |
175 | ||
1da177e4 LT |
176 | extern void free_irq(unsigned int, void *); |
177 | ||
0af3678f AV |
178 | struct device; |
179 | ||
935bd5b9 AV |
180 | extern int __must_check |
181 | devm_request_threaded_irq(struct device *dev, unsigned int irq, | |
182 | irq_handler_t handler, irq_handler_t thread_fn, | |
183 | unsigned long irqflags, const char *devname, | |
184 | void *dev_id); | |
185 | ||
186 | static inline int __must_check | |
187 | devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, | |
188 | unsigned long irqflags, const char *devname, void *dev_id) | |
189 | { | |
190 | return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, | |
191 | devname, dev_id); | |
192 | } | |
193 | ||
9ac7849e TH |
194 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); |
195 | ||
d7e9629d IM |
196 | /* |
197 | * On lockdep we dont want to enable hardirqs in hardirq | |
198 | * context. Use local_irq_enable_in_hardirq() to annotate | |
199 | * kernel code that has to do this nevertheless (pretty much | |
200 | * the only valid case is for old/broken hardware that is | |
201 | * insanely slow). | |
202 | * | |
203 | * NOTE: in theory this might break fragile code that relies | |
204 | * on hardirq delivery - in practice we dont seem to have such | |
205 | * places left. So the only effect should be slightly increased | |
206 | * irqs-off latencies. | |
207 | */ | |
208 | #ifdef CONFIG_LOCKDEP | |
209 | # define local_irq_enable_in_hardirq() do { } while (0) | |
210 | #else | |
211 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
212 | #endif | |
1da177e4 | 213 | |
1da177e4 LT |
214 | extern void disable_irq_nosync(unsigned int irq); |
215 | extern void disable_irq(unsigned int irq); | |
216 | extern void enable_irq(unsigned int irq); | |
ba9a2331 | 217 | |
0a0c5168 | 218 | /* The following three functions are for the core kernel use only. */ |
5818a6e2 | 219 | #ifdef CONFIG_GENERIC_HARDIRQS |
0a0c5168 RW |
220 | extern void suspend_device_irqs(void); |
221 | extern void resume_device_irqs(void); | |
222 | #ifdef CONFIG_PM_SLEEP | |
223 | extern int check_wakeup_irqs(void); | |
224 | #else | |
225 | static inline int check_wakeup_irqs(void) { return 0; } | |
226 | #endif | |
5818a6e2 HC |
227 | #else |
228 | static inline void suspend_device_irqs(void) { }; | |
229 | static inline void resume_device_irqs(void) { }; | |
230 | static inline int check_wakeup_irqs(void) { return 0; } | |
0a0c5168 RW |
231 | #endif |
232 | ||
d7b90689 RK |
233 | #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS) |
234 | ||
d036e67b | 235 | extern cpumask_var_t irq_default_affinity; |
18404756 | 236 | |
0de26520 | 237 | extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask); |
d7b90689 | 238 | extern int irq_can_set_affinity(unsigned int irq); |
18404756 | 239 | extern int irq_select_affinity(unsigned int irq); |
d7b90689 | 240 | |
e7a297b0 | 241 | extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); |
d7b90689 RK |
242 | #else /* CONFIG_SMP */ |
243 | ||
0de26520 | 244 | static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) |
d7b90689 RK |
245 | { |
246 | return -EINVAL; | |
247 | } | |
248 | ||
249 | static inline int irq_can_set_affinity(unsigned int irq) | |
250 | { | |
251 | return 0; | |
252 | } | |
253 | ||
18404756 MK |
254 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
255 | ||
e7a297b0 PWJ |
256 | static inline int irq_set_affinity_hint(unsigned int irq, |
257 | const struct cpumask *m) | |
258 | { | |
259 | return -EINVAL; | |
260 | } | |
d7b90689 RK |
261 | #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */ |
262 | ||
e9ed7e72 | 263 | #ifdef CONFIG_GENERIC_HARDIRQS |
c01d403b IM |
264 | /* |
265 | * Special lockdep variants of irq disabling/enabling. | |
266 | * These should be used for locking constructs that | |
267 | * know that a particular irq context which is disabled, | |
268 | * and which is the only irq-context user of a lock, | |
269 | * that it's safe to take the lock in the irq-disabled | |
270 | * section without disabling hardirqs. | |
271 | * | |
272 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
273 | * irq disable/enable methods. | |
274 | */ | |
275 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
276 | { | |
277 | disable_irq_nosync(irq); | |
278 | #ifdef CONFIG_LOCKDEP | |
279 | local_irq_disable(); | |
280 | #endif | |
281 | } | |
282 | ||
e8106b94 AV |
283 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
284 | { | |
285 | disable_irq_nosync(irq); | |
286 | #ifdef CONFIG_LOCKDEP | |
287 | local_irq_save(*flags); | |
288 | #endif | |
289 | } | |
290 | ||
c01d403b IM |
291 | static inline void disable_irq_lockdep(unsigned int irq) |
292 | { | |
293 | disable_irq(irq); | |
294 | #ifdef CONFIG_LOCKDEP | |
295 | local_irq_disable(); | |
296 | #endif | |
297 | } | |
298 | ||
299 | static inline void enable_irq_lockdep(unsigned int irq) | |
300 | { | |
301 | #ifdef CONFIG_LOCKDEP | |
302 | local_irq_enable(); | |
303 | #endif | |
304 | enable_irq(irq); | |
305 | } | |
306 | ||
e8106b94 AV |
307 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
308 | { | |
309 | #ifdef CONFIG_LOCKDEP | |
310 | local_irq_restore(*flags); | |
311 | #endif | |
312 | enable_irq(irq); | |
313 | } | |
314 | ||
ba9a2331 TG |
315 | /* IRQ wakeup (PM) control: */ |
316 | extern int set_irq_wake(unsigned int irq, unsigned int on); | |
317 | ||
318 | static inline int enable_irq_wake(unsigned int irq) | |
319 | { | |
320 | return set_irq_wake(irq, 1); | |
321 | } | |
322 | ||
323 | static inline int disable_irq_wake(unsigned int irq) | |
324 | { | |
325 | return set_irq_wake(irq, 0); | |
326 | } | |
327 | ||
c01d403b IM |
328 | #else /* !CONFIG_GENERIC_HARDIRQS */ |
329 | /* | |
330 | * NOTE: non-genirq architectures, if they want to support the lock | |
331 | * validator need to define the methods below in their asm/irq.h | |
332 | * files, under an #ifdef CONFIG_LOCKDEP section. | |
333 | */ | |
b3e2fd9c | 334 | #ifndef CONFIG_LOCKDEP |
c01d403b | 335 | # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq) |
b3e2fd9c RZ |
336 | # define disable_irq_nosync_lockdep_irqsave(irq, flags) \ |
337 | disable_irq_nosync(irq) | |
c01d403b IM |
338 | # define disable_irq_lockdep(irq) disable_irq(irq) |
339 | # define enable_irq_lockdep(irq) enable_irq(irq) | |
b3e2fd9c RZ |
340 | # define enable_irq_lockdep_irqrestore(irq, flags) \ |
341 | enable_irq(irq) | |
c01d403b IM |
342 | # endif |
343 | ||
aa5346a2 GL |
344 | static inline int enable_irq_wake(unsigned int irq) |
345 | { | |
346 | return 0; | |
347 | } | |
348 | ||
349 | static inline int disable_irq_wake(unsigned int irq) | |
350 | { | |
351 | return 0; | |
352 | } | |
c01d403b | 353 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 354 | |
3f74478b AK |
355 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
356 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
357 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
358 | #endif | |
359 | ||
2d3fbbb3 BH |
360 | /* Some architectures might implement lazy enabling/disabling of |
361 | * interrupts. In some cases, such as stop_machine, we might want | |
362 | * to ensure that after a local_irq_disable(), interrupts have | |
363 | * really been disabled in hardware. Such architectures need to | |
364 | * implement the following hook. | |
365 | */ | |
366 | #ifndef hard_irq_disable | |
367 | #define hard_irq_disable() do { } while(0) | |
368 | #endif | |
369 | ||
1da177e4 LT |
370 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
371 | frequency threaded job scheduling. For almost all the purposes | |
372 | tasklets are more than enough. F.e. all serial device BHs et | |
373 | al. should be converted to tasklets, not to softirqs. | |
374 | */ | |
375 | ||
376 | enum | |
377 | { | |
378 | HI_SOFTIRQ=0, | |
379 | TIMER_SOFTIRQ, | |
380 | NET_TX_SOFTIRQ, | |
381 | NET_RX_SOFTIRQ, | |
ff856bad | 382 | BLOCK_SOFTIRQ, |
5e605b64 | 383 | BLOCK_IOPOLL_SOFTIRQ, |
c9819f45 CL |
384 | TASKLET_SOFTIRQ, |
385 | SCHED_SOFTIRQ, | |
a6037b61 PZ |
386 | HRTIMER_SOFTIRQ, |
387 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ | |
978b0116 AD |
388 | |
389 | NR_SOFTIRQS | |
1da177e4 LT |
390 | }; |
391 | ||
5d592b44 JB |
392 | /* map softirq index to softirq name. update 'softirq_to_name' in |
393 | * kernel/softirq.c when adding a new softirq. | |
394 | */ | |
395 | extern char *softirq_to_name[NR_SOFTIRQS]; | |
396 | ||
1da177e4 LT |
397 | /* softirq mask and active fields moved to irq_cpustat_t in |
398 | * asm/hardirq.h to get better cache usage. KAO | |
399 | */ | |
400 | ||
401 | struct softirq_action | |
402 | { | |
403 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
404 | }; |
405 | ||
406 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 407 | asmlinkage void __do_softirq(void); |
962cf36c | 408 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
1da177e4 | 409 | extern void softirq_init(void); |
3f74478b | 410 | #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) |
b3c97528 HH |
411 | extern void raise_softirq_irqoff(unsigned int nr); |
412 | extern void raise_softirq(unsigned int nr); | |
7f1e2ca9 | 413 | extern void wakeup_softirqd(void); |
1da177e4 | 414 | |
54514a70 DM |
415 | /* This is the worklist that queues up per-cpu softirq work. |
416 | * | |
417 | * send_remote_sendirq() adds work to these lists, and | |
418 | * the softirq handler itself dequeues from them. The queues | |
419 | * are protected by disabling local cpu interrupts and they must | |
420 | * only be accessed by the local cpu that they are for. | |
421 | */ | |
422 | DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list); | |
423 | ||
424 | /* Try to send a softirq to a remote cpu. If this cannot be done, the | |
425 | * work will be queued to the local cpu. | |
426 | */ | |
427 | extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq); | |
428 | ||
429 | /* Like send_remote_softirq(), but the caller must disable local cpu interrupts | |
430 | * and compute the current cpu, passed in as 'this_cpu'. | |
431 | */ | |
432 | extern void __send_remote_softirq(struct call_single_data *cp, int cpu, | |
433 | int this_cpu, int softirq); | |
1da177e4 LT |
434 | |
435 | /* Tasklets --- multithreaded analogue of BHs. | |
436 | ||
437 | Main feature differing them of generic softirqs: tasklet | |
438 | is running only on one CPU simultaneously. | |
439 | ||
440 | Main feature differing them of BHs: different tasklets | |
441 | may be run simultaneously on different CPUs. | |
442 | ||
443 | Properties: | |
444 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
445 | to be executed on some cpu at least once after this. | |
446 | * If the tasklet is already scheduled, but its excecution is still not | |
447 | started, it will be executed only once. | |
448 | * If this tasklet is already running on another CPU (or schedule is called | |
449 | from tasklet itself), it is rescheduled for later. | |
450 | * Tasklet is strictly serialized wrt itself, but not | |
451 | wrt another tasklets. If client needs some intertask synchronization, | |
452 | he makes it with spinlocks. | |
453 | */ | |
454 | ||
455 | struct tasklet_struct | |
456 | { | |
457 | struct tasklet_struct *next; | |
458 | unsigned long state; | |
459 | atomic_t count; | |
460 | void (*func)(unsigned long); | |
461 | unsigned long data; | |
462 | }; | |
463 | ||
464 | #define DECLARE_TASKLET(name, func, data) \ | |
465 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
466 | ||
467 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
468 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
469 | ||
470 | ||
471 | enum | |
472 | { | |
473 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
474 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
475 | }; | |
476 | ||
477 | #ifdef CONFIG_SMP | |
478 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
479 | { | |
480 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
481 | } | |
482 | ||
483 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
484 | { | |
485 | smp_mb__before_clear_bit(); | |
486 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
487 | } | |
488 | ||
489 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
490 | { | |
491 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
492 | } | |
493 | #else | |
494 | #define tasklet_trylock(t) 1 | |
495 | #define tasklet_unlock_wait(t) do { } while (0) | |
496 | #define tasklet_unlock(t) do { } while (0) | |
497 | #endif | |
498 | ||
b3c97528 | 499 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
500 | |
501 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
502 | { | |
503 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
504 | __tasklet_schedule(t); | |
505 | } | |
506 | ||
b3c97528 | 507 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
508 | |
509 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
510 | { | |
511 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
512 | __tasklet_hi_schedule(t); | |
513 | } | |
514 | ||
7c692cba VN |
515 | extern void __tasklet_hi_schedule_first(struct tasklet_struct *t); |
516 | ||
517 | /* | |
518 | * This version avoids touching any other tasklets. Needed for kmemcheck | |
519 | * in order not to take any page faults while enqueueing this tasklet; | |
520 | * consider VERY carefully whether you really need this or | |
521 | * tasklet_hi_schedule()... | |
522 | */ | |
523 | static inline void tasklet_hi_schedule_first(struct tasklet_struct *t) | |
524 | { | |
525 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
526 | __tasklet_hi_schedule_first(t); | |
527 | } | |
528 | ||
1da177e4 LT |
529 | |
530 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
531 | { | |
532 | atomic_inc(&t->count); | |
533 | smp_mb__after_atomic_inc(); | |
534 | } | |
535 | ||
536 | static inline void tasklet_disable(struct tasklet_struct *t) | |
537 | { | |
538 | tasklet_disable_nosync(t); | |
539 | tasklet_unlock_wait(t); | |
540 | smp_mb(); | |
541 | } | |
542 | ||
543 | static inline void tasklet_enable(struct tasklet_struct *t) | |
544 | { | |
545 | smp_mb__before_atomic_dec(); | |
546 | atomic_dec(&t->count); | |
547 | } | |
548 | ||
549 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
550 | { | |
551 | smp_mb__before_atomic_dec(); | |
552 | atomic_dec(&t->count); | |
553 | } | |
554 | ||
555 | extern void tasklet_kill(struct tasklet_struct *t); | |
556 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
557 | extern void tasklet_init(struct tasklet_struct *t, | |
558 | void (*func)(unsigned long), unsigned long data); | |
559 | ||
9ba5f005 PZ |
560 | struct tasklet_hrtimer { |
561 | struct hrtimer timer; | |
562 | struct tasklet_struct tasklet; | |
563 | enum hrtimer_restart (*function)(struct hrtimer *); | |
564 | }; | |
565 | ||
566 | extern void | |
567 | tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, | |
568 | enum hrtimer_restart (*function)(struct hrtimer *), | |
569 | clockid_t which_clock, enum hrtimer_mode mode); | |
570 | ||
571 | static inline | |
572 | int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, | |
573 | const enum hrtimer_mode mode) | |
574 | { | |
575 | return hrtimer_start(&ttimer->timer, time, mode); | |
576 | } | |
577 | ||
578 | static inline | |
579 | void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) | |
580 | { | |
581 | hrtimer_cancel(&ttimer->timer); | |
582 | tasklet_kill(&ttimer->tasklet); | |
583 | } | |
584 | ||
1da177e4 LT |
585 | /* |
586 | * Autoprobing for irqs: | |
587 | * | |
588 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
589 | * for accurate IRQ probing during kernel initialization. They are | |
590 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
591 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
592 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
593 | * | |
594 | * For reasonably foolproof probing, use them as follows: | |
595 | * | |
596 | * 1. clear and/or mask the device's internal interrupt. | |
597 | * 2. sti(); | |
598 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
599 | * 4. enable the device and cause it to trigger an interrupt. | |
600 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
601 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
602 | * 7. service the device to clear its pending interrupt. | |
603 | * 8. loop again if paranoia is required. | |
604 | * | |
605 | * probe_irq_on() returns a mask of allocated irq's. | |
606 | * | |
607 | * probe_irq_off() takes the mask as a parameter, | |
608 | * and returns the irq number which occurred, | |
609 | * or zero if none occurred, or a negative irq number | |
610 | * if more than one irq occurred. | |
611 | */ | |
612 | ||
613 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
614 | static inline unsigned long probe_irq_on(void) | |
615 | { | |
616 | return 0; | |
617 | } | |
618 | static inline int probe_irq_off(unsigned long val) | |
619 | { | |
620 | return 0; | |
621 | } | |
622 | static inline unsigned int probe_irq_mask(unsigned long val) | |
623 | { | |
624 | return 0; | |
625 | } | |
626 | #else | |
627 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
628 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
629 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
630 | #endif | |
631 | ||
6168a702 AM |
632 | #ifdef CONFIG_PROC_FS |
633 | /* Initialize /proc/irq/ */ | |
634 | extern void init_irq_proc(void); | |
635 | #else | |
636 | static inline void init_irq_proc(void) | |
637 | { | |
638 | } | |
639 | #endif | |
640 | ||
d43c36dc | 641 | struct seq_file; |
f74596d0 AB |
642 | int show_interrupts(struct seq_file *p, void *v); |
643 | ||
43a25632 YL |
644 | struct irq_desc; |
645 | ||
646 | extern int early_irq_init(void); | |
4a046d17 | 647 | extern int arch_probe_nr_irqs(void); |
43a25632 | 648 | extern int arch_early_irq_init(void); |
85ac16d0 | 649 | extern int arch_init_chip_data(struct irq_desc *desc, int node); |
43a25632 | 650 | |
1da177e4 | 651 | #endif |