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> |
de30a2b3 | 13 | #include <linux/irqflags.h> |
9ba5f005 | 14 | #include <linux/hrtimer.h> |
cd7eab44 BH |
15 | #include <linux/kref.h> |
16 | #include <linux/workqueue.h> | |
0ebb26e7 | 17 | |
60063497 | 18 | #include <linux/atomic.h> |
1da177e4 | 19 | #include <asm/ptrace.h> |
7d65f4a6 | 20 | #include <asm/irq.h> |
1da177e4 | 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_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) | |
b25c340c TG |
52 | * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished. |
53 | * Used by threaded interrupts which need to keep the | |
54 | * irq line disabled until the threaded handler has been run. | |
685fd0b4 | 55 | * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend |
dc5f219e | 56 | * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set |
0c4602ff | 57 | * IRQF_NO_THREAD - Interrupt cannot be threaded |
9bab0b7f IC |
58 | * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device |
59 | * resume time. | |
6e213616 TG |
60 | */ |
61 | #define IRQF_DISABLED 0x00000020 | |
6e213616 TG |
62 | #define IRQF_SHARED 0x00000080 |
63 | #define IRQF_PROBE_SHARED 0x00000100 | |
685fd0b4 | 64 | #define __IRQF_TIMER 0x00000200 |
284c6680 | 65 | #define IRQF_PERCPU 0x00000400 |
950f4427 | 66 | #define IRQF_NOBALANCING 0x00000800 |
d85a60d8 | 67 | #define IRQF_IRQPOLL 0x00001000 |
b25c340c | 68 | #define IRQF_ONESHOT 0x00002000 |
685fd0b4 | 69 | #define IRQF_NO_SUSPEND 0x00004000 |
dc5f219e | 70 | #define IRQF_FORCE_RESUME 0x00008000 |
0c4602ff | 71 | #define IRQF_NO_THREAD 0x00010000 |
9bab0b7f | 72 | #define IRQF_EARLY_RESUME 0x00020000 |
685fd0b4 | 73 | |
0c4602ff | 74 | #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) |
3aa551c9 | 75 | |
b4e6b097 | 76 | /* |
ae731f8d MZ |
77 | * These values can be returned by request_any_context_irq() and |
78 | * describe the context the interrupt will be run in. | |
79 | * | |
80 | * IRQC_IS_HARDIRQ - interrupt runs in hardirq context | |
81 | * IRQC_IS_NESTED - interrupt runs in a nested threaded context | |
82 | */ | |
83 | enum { | |
84 | IRQC_IS_HARDIRQ = 0, | |
85 | IRQC_IS_NESTED, | |
86 | }; | |
87 | ||
7d12e780 | 88 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 89 | |
a9d0a1a3 TG |
90 | /** |
91 | * struct irqaction - per interrupt action descriptor | |
92 | * @handler: interrupt handler function | |
a9d0a1a3 TG |
93 | * @name: name of the device |
94 | * @dev_id: cookie to identify the device | |
31d9d9b6 | 95 | * @percpu_dev_id: cookie to identify the device |
a9d0a1a3 TG |
96 | * @next: pointer to the next irqaction for shared interrupts |
97 | * @irq: interrupt number | |
c0ecaa06 | 98 | * @flags: flags (see IRQF_* above) |
25985edc | 99 | * @thread_fn: interrupt handler function for threaded interrupts |
3aa551c9 TG |
100 | * @thread: thread pointer for threaded interrupts |
101 | * @thread_flags: flags related to @thread | |
b5faba21 | 102 | * @thread_mask: bitmask for keeping track of @thread activity |
c0ecaa06 | 103 | * @dir: pointer to the proc/irq/NN/name entry |
a9d0a1a3 | 104 | */ |
1da177e4 | 105 | struct irqaction { |
31d9d9b6 | 106 | irq_handler_t handler; |
31d9d9b6 MZ |
107 | void *dev_id; |
108 | void __percpu *percpu_dev_id; | |
109 | struct irqaction *next; | |
31d9d9b6 MZ |
110 | irq_handler_t thread_fn; |
111 | struct task_struct *thread; | |
c0ecaa06 TG |
112 | unsigned int irq; |
113 | unsigned int flags; | |
31d9d9b6 MZ |
114 | unsigned long thread_flags; |
115 | unsigned long thread_mask; | |
116 | const char *name; | |
117 | struct proc_dir_entry *dir; | |
f6cd2477 | 118 | } ____cacheline_internodealigned_in_smp; |
1da177e4 | 119 | |
7d12e780 | 120 | extern irqreturn_t no_action(int cpl, void *dev_id); |
3aa551c9 TG |
121 | |
122 | extern int __must_check | |
123 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
124 | irq_handler_t thread_fn, | |
125 | unsigned long flags, const char *name, void *dev); | |
126 | ||
127 | static inline int __must_check | |
128 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
129 | const char *name, void *dev) | |
130 | { | |
131 | return request_threaded_irq(irq, handler, NULL, flags, name, dev); | |
132 | } | |
133 | ||
ae731f8d MZ |
134 | extern int __must_check |
135 | request_any_context_irq(unsigned int irq, irq_handler_t handler, | |
136 | unsigned long flags, const char *name, void *dev_id); | |
137 | ||
31d9d9b6 MZ |
138 | extern int __must_check |
139 | request_percpu_irq(unsigned int irq, irq_handler_t handler, | |
140 | const char *devname, void __percpu *percpu_dev_id); | |
3aa551c9 | 141 | |
1da177e4 | 142 | extern void free_irq(unsigned int, void *); |
31d9d9b6 | 143 | extern void free_percpu_irq(unsigned int, void __percpu *); |
1da177e4 | 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 | ||
0668d306 SB |
161 | extern int __must_check |
162 | devm_request_any_context_irq(struct device *dev, unsigned int irq, | |
163 | irq_handler_t handler, unsigned long irqflags, | |
164 | const char *devname, void *dev_id); | |
165 | ||
9ac7849e TH |
166 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); |
167 | ||
d7e9629d IM |
168 | /* |
169 | * On lockdep we dont want to enable hardirqs in hardirq | |
170 | * context. Use local_irq_enable_in_hardirq() to annotate | |
171 | * kernel code that has to do this nevertheless (pretty much | |
172 | * the only valid case is for old/broken hardware that is | |
173 | * insanely slow). | |
174 | * | |
175 | * NOTE: in theory this might break fragile code that relies | |
176 | * on hardirq delivery - in practice we dont seem to have such | |
177 | * places left. So the only effect should be slightly increased | |
178 | * irqs-off latencies. | |
179 | */ | |
180 | #ifdef CONFIG_LOCKDEP | |
181 | # define local_irq_enable_in_hardirq() do { } while (0) | |
182 | #else | |
183 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
184 | #endif | |
1da177e4 | 185 | |
1da177e4 LT |
186 | extern void disable_irq_nosync(unsigned int irq); |
187 | extern void disable_irq(unsigned int irq); | |
31d9d9b6 | 188 | extern void disable_percpu_irq(unsigned int irq); |
1da177e4 | 189 | extern void enable_irq(unsigned int irq); |
1e7c5fd2 | 190 | extern void enable_percpu_irq(unsigned int irq, unsigned int type); |
ba9a2331 | 191 | |
0a0c5168 RW |
192 | /* The following three functions are for the core kernel use only. */ |
193 | extern void suspend_device_irqs(void); | |
194 | extern void resume_device_irqs(void); | |
195 | #ifdef CONFIG_PM_SLEEP | |
196 | extern int check_wakeup_irqs(void); | |
197 | #else | |
198 | static inline int check_wakeup_irqs(void) { return 0; } | |
199 | #endif | |
200 | ||
0244ad00 | 201 | #if defined(CONFIG_SMP) |
d7b90689 | 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 | 208 | |
e7a297b0 | 209 | extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); |
cd7eab44 BH |
210 | |
211 | /** | |
212 | * struct irq_affinity_notify - context for notification of IRQ affinity changes | |
213 | * @irq: Interrupt to which notification applies | |
214 | * @kref: Reference count, for internal use | |
215 | * @work: Work item, for internal use | |
216 | * @notify: Function to be called on change. This will be | |
217 | * called in process context. | |
218 | * @release: Function to be called on release. This will be | |
219 | * called in process context. Once registered, the | |
220 | * structure must only be freed when this function is | |
221 | * called or later. | |
222 | */ | |
223 | struct irq_affinity_notify { | |
224 | unsigned int irq; | |
225 | struct kref kref; | |
226 | struct work_struct work; | |
227 | void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); | |
228 | void (*release)(struct kref *ref); | |
229 | }; | |
230 | ||
231 | extern int | |
232 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); | |
233 | ||
d7b90689 RK |
234 | #else /* CONFIG_SMP */ |
235 | ||
0de26520 | 236 | static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) |
d7b90689 RK |
237 | { |
238 | return -EINVAL; | |
239 | } | |
240 | ||
241 | static inline int irq_can_set_affinity(unsigned int irq) | |
242 | { | |
243 | return 0; | |
244 | } | |
245 | ||
18404756 MK |
246 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
247 | ||
e7a297b0 | 248 | static inline int irq_set_affinity_hint(unsigned int irq, |
cd7eab44 | 249 | const struct cpumask *m) |
e7a297b0 PWJ |
250 | { |
251 | return -EINVAL; | |
252 | } | |
0244ad00 | 253 | #endif /* CONFIG_SMP */ |
d7b90689 | 254 | |
c01d403b IM |
255 | /* |
256 | * Special lockdep variants of irq disabling/enabling. | |
257 | * These should be used for locking constructs that | |
258 | * know that a particular irq context which is disabled, | |
259 | * and which is the only irq-context user of a lock, | |
260 | * that it's safe to take the lock in the irq-disabled | |
261 | * section without disabling hardirqs. | |
262 | * | |
263 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
264 | * irq disable/enable methods. | |
265 | */ | |
266 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
267 | { | |
268 | disable_irq_nosync(irq); | |
269 | #ifdef CONFIG_LOCKDEP | |
270 | local_irq_disable(); | |
271 | #endif | |
272 | } | |
273 | ||
e8106b94 AV |
274 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
275 | { | |
276 | disable_irq_nosync(irq); | |
277 | #ifdef CONFIG_LOCKDEP | |
278 | local_irq_save(*flags); | |
279 | #endif | |
280 | } | |
281 | ||
c01d403b IM |
282 | static inline void disable_irq_lockdep(unsigned int irq) |
283 | { | |
284 | disable_irq(irq); | |
285 | #ifdef CONFIG_LOCKDEP | |
286 | local_irq_disable(); | |
287 | #endif | |
288 | } | |
289 | ||
290 | static inline void enable_irq_lockdep(unsigned int irq) | |
291 | { | |
292 | #ifdef CONFIG_LOCKDEP | |
293 | local_irq_enable(); | |
294 | #endif | |
295 | enable_irq(irq); | |
296 | } | |
297 | ||
e8106b94 AV |
298 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
299 | { | |
300 | #ifdef CONFIG_LOCKDEP | |
301 | local_irq_restore(*flags); | |
302 | #endif | |
303 | enable_irq(irq); | |
304 | } | |
305 | ||
ba9a2331 | 306 | /* IRQ wakeup (PM) control: */ |
a0cd9ca2 TG |
307 | extern int irq_set_irq_wake(unsigned int irq, unsigned int on); |
308 | ||
ba9a2331 TG |
309 | static inline int enable_irq_wake(unsigned int irq) |
310 | { | |
a0cd9ca2 | 311 | return irq_set_irq_wake(irq, 1); |
ba9a2331 TG |
312 | } |
313 | ||
314 | static inline int disable_irq_wake(unsigned int irq) | |
315 | { | |
a0cd9ca2 | 316 | return irq_set_irq_wake(irq, 0); |
ba9a2331 TG |
317 | } |
318 | ||
8d32a307 TG |
319 | |
320 | #ifdef CONFIG_IRQ_FORCED_THREADING | |
321 | extern bool force_irqthreads; | |
322 | #else | |
323 | #define force_irqthreads (0) | |
324 | #endif | |
325 | ||
3f74478b AK |
326 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
327 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
328 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
329 | #endif | |
330 | ||
2d3fbbb3 BH |
331 | /* Some architectures might implement lazy enabling/disabling of |
332 | * interrupts. In some cases, such as stop_machine, we might want | |
333 | * to ensure that after a local_irq_disable(), interrupts have | |
334 | * really been disabled in hardware. Such architectures need to | |
335 | * implement the following hook. | |
336 | */ | |
337 | #ifndef hard_irq_disable | |
338 | #define hard_irq_disable() do { } while(0) | |
339 | #endif | |
340 | ||
1da177e4 LT |
341 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
342 | frequency threaded job scheduling. For almost all the purposes | |
343 | tasklets are more than enough. F.e. all serial device BHs et | |
344 | al. should be converted to tasklets, not to softirqs. | |
345 | */ | |
346 | ||
347 | enum | |
348 | { | |
349 | HI_SOFTIRQ=0, | |
350 | TIMER_SOFTIRQ, | |
351 | NET_TX_SOFTIRQ, | |
352 | NET_RX_SOFTIRQ, | |
ff856bad | 353 | BLOCK_SOFTIRQ, |
5e605b64 | 354 | BLOCK_IOPOLL_SOFTIRQ, |
c9819f45 CL |
355 | TASKLET_SOFTIRQ, |
356 | SCHED_SOFTIRQ, | |
a6037b61 | 357 | HRTIMER_SOFTIRQ, |
09223371 | 358 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ |
978b0116 AD |
359 | |
360 | NR_SOFTIRQS | |
1da177e4 LT |
361 | }; |
362 | ||
803b0eba PM |
363 | #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ)) |
364 | ||
5d592b44 JB |
365 | /* map softirq index to softirq name. update 'softirq_to_name' in |
366 | * kernel/softirq.c when adding a new softirq. | |
367 | */ | |
ce85b4f2 | 368 | extern const char * const softirq_to_name[NR_SOFTIRQS]; |
5d592b44 | 369 | |
1da177e4 LT |
370 | /* softirq mask and active fields moved to irq_cpustat_t in |
371 | * asm/hardirq.h to get better cache usage. KAO | |
372 | */ | |
373 | ||
374 | struct softirq_action | |
375 | { | |
376 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
377 | }; |
378 | ||
379 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 380 | asmlinkage void __do_softirq(void); |
7d65f4a6 FW |
381 | |
382 | #ifdef __ARCH_HAS_DO_SOFTIRQ | |
383 | void do_softirq_own_stack(void); | |
384 | #else | |
385 | static inline void do_softirq_own_stack(void) | |
386 | { | |
387 | __do_softirq(); | |
388 | } | |
389 | #endif | |
390 | ||
962cf36c | 391 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
1da177e4 | 392 | extern void softirq_init(void); |
f069686e | 393 | extern void __raise_softirq_irqoff(unsigned int nr); |
2bf2160d | 394 | |
b3c97528 HH |
395 | extern void raise_softirq_irqoff(unsigned int nr); |
396 | extern void raise_softirq(unsigned int nr); | |
1da177e4 | 397 | |
4dd53d89 VP |
398 | DECLARE_PER_CPU(struct task_struct *, ksoftirqd); |
399 | ||
400 | static inline struct task_struct *this_cpu_ksoftirqd(void) | |
401 | { | |
402 | return this_cpu_read(ksoftirqd); | |
403 | } | |
404 | ||
1da177e4 LT |
405 | /* Tasklets --- multithreaded analogue of BHs. |
406 | ||
407 | Main feature differing them of generic softirqs: tasklet | |
408 | is running only on one CPU simultaneously. | |
409 | ||
410 | Main feature differing them of BHs: different tasklets | |
411 | may be run simultaneously on different CPUs. | |
412 | ||
413 | Properties: | |
414 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
415 | to be executed on some cpu at least once after this. | |
25985edc | 416 | * If the tasklet is already scheduled, but its execution is still not |
1da177e4 LT |
417 | started, it will be executed only once. |
418 | * If this tasklet is already running on another CPU (or schedule is called | |
419 | from tasklet itself), it is rescheduled for later. | |
420 | * Tasklet is strictly serialized wrt itself, but not | |
421 | wrt another tasklets. If client needs some intertask synchronization, | |
422 | he makes it with spinlocks. | |
423 | */ | |
424 | ||
425 | struct tasklet_struct | |
426 | { | |
427 | struct tasklet_struct *next; | |
428 | unsigned long state; | |
429 | atomic_t count; | |
430 | void (*func)(unsigned long); | |
431 | unsigned long data; | |
432 | }; | |
433 | ||
434 | #define DECLARE_TASKLET(name, func, data) \ | |
435 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
436 | ||
437 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
438 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
439 | ||
440 | ||
441 | enum | |
442 | { | |
443 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
444 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
445 | }; | |
446 | ||
447 | #ifdef CONFIG_SMP | |
448 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
449 | { | |
450 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
451 | } | |
452 | ||
453 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
454 | { | |
455 | smp_mb__before_clear_bit(); | |
456 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
457 | } | |
458 | ||
459 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
460 | { | |
461 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
462 | } | |
463 | #else | |
464 | #define tasklet_trylock(t) 1 | |
465 | #define tasklet_unlock_wait(t) do { } while (0) | |
466 | #define tasklet_unlock(t) do { } while (0) | |
467 | #endif | |
468 | ||
b3c97528 | 469 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
470 | |
471 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
472 | { | |
473 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
474 | __tasklet_schedule(t); | |
475 | } | |
476 | ||
b3c97528 | 477 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
478 | |
479 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
480 | { | |
481 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
482 | __tasklet_hi_schedule(t); | |
483 | } | |
484 | ||
7c692cba VN |
485 | extern void __tasklet_hi_schedule_first(struct tasklet_struct *t); |
486 | ||
487 | /* | |
488 | * This version avoids touching any other tasklets. Needed for kmemcheck | |
489 | * in order not to take any page faults while enqueueing this tasklet; | |
490 | * consider VERY carefully whether you really need this or | |
491 | * tasklet_hi_schedule()... | |
492 | */ | |
493 | static inline void tasklet_hi_schedule_first(struct tasklet_struct *t) | |
494 | { | |
495 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
496 | __tasklet_hi_schedule_first(t); | |
497 | } | |
498 | ||
1da177e4 LT |
499 | |
500 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
501 | { | |
502 | atomic_inc(&t->count); | |
503 | smp_mb__after_atomic_inc(); | |
504 | } | |
505 | ||
506 | static inline void tasklet_disable(struct tasklet_struct *t) | |
507 | { | |
508 | tasklet_disable_nosync(t); | |
509 | tasklet_unlock_wait(t); | |
510 | smp_mb(); | |
511 | } | |
512 | ||
513 | static inline void tasklet_enable(struct tasklet_struct *t) | |
514 | { | |
515 | smp_mb__before_atomic_dec(); | |
516 | atomic_dec(&t->count); | |
517 | } | |
518 | ||
519 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
520 | { | |
521 | smp_mb__before_atomic_dec(); | |
522 | atomic_dec(&t->count); | |
523 | } | |
524 | ||
525 | extern void tasklet_kill(struct tasklet_struct *t); | |
526 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
527 | extern void tasklet_init(struct tasklet_struct *t, | |
528 | void (*func)(unsigned long), unsigned long data); | |
529 | ||
9ba5f005 PZ |
530 | struct tasklet_hrtimer { |
531 | struct hrtimer timer; | |
532 | struct tasklet_struct tasklet; | |
533 | enum hrtimer_restart (*function)(struct hrtimer *); | |
534 | }; | |
535 | ||
536 | extern void | |
537 | tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, | |
538 | enum hrtimer_restart (*function)(struct hrtimer *), | |
539 | clockid_t which_clock, enum hrtimer_mode mode); | |
540 | ||
541 | static inline | |
542 | int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, | |
543 | const enum hrtimer_mode mode) | |
544 | { | |
545 | return hrtimer_start(&ttimer->timer, time, mode); | |
546 | } | |
547 | ||
548 | static inline | |
549 | void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) | |
550 | { | |
551 | hrtimer_cancel(&ttimer->timer); | |
552 | tasklet_kill(&ttimer->tasklet); | |
553 | } | |
554 | ||
1da177e4 LT |
555 | /* |
556 | * Autoprobing for irqs: | |
557 | * | |
558 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
559 | * for accurate IRQ probing during kernel initialization. They are | |
560 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
561 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
562 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
563 | * | |
564 | * For reasonably foolproof probing, use them as follows: | |
565 | * | |
566 | * 1. clear and/or mask the device's internal interrupt. | |
567 | * 2. sti(); | |
568 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
569 | * 4. enable the device and cause it to trigger an interrupt. | |
570 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
571 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
572 | * 7. service the device to clear its pending interrupt. | |
573 | * 8. loop again if paranoia is required. | |
574 | * | |
575 | * probe_irq_on() returns a mask of allocated irq's. | |
576 | * | |
577 | * probe_irq_off() takes the mask as a parameter, | |
578 | * and returns the irq number which occurred, | |
579 | * or zero if none occurred, or a negative irq number | |
580 | * if more than one irq occurred. | |
581 | */ | |
582 | ||
0244ad00 | 583 | #if !defined(CONFIG_GENERIC_IRQ_PROBE) |
1da177e4 LT |
584 | static inline unsigned long probe_irq_on(void) |
585 | { | |
586 | return 0; | |
587 | } | |
588 | static inline int probe_irq_off(unsigned long val) | |
589 | { | |
590 | return 0; | |
591 | } | |
592 | static inline unsigned int probe_irq_mask(unsigned long val) | |
593 | { | |
594 | return 0; | |
595 | } | |
596 | #else | |
597 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
598 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
599 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
600 | #endif | |
601 | ||
6168a702 AM |
602 | #ifdef CONFIG_PROC_FS |
603 | /* Initialize /proc/irq/ */ | |
604 | extern void init_irq_proc(void); | |
605 | #else | |
606 | static inline void init_irq_proc(void) | |
607 | { | |
608 | } | |
609 | #endif | |
610 | ||
d43c36dc | 611 | struct seq_file; |
f74596d0 | 612 | int show_interrupts(struct seq_file *p, void *v); |
c78b9b65 | 613 | int arch_show_interrupts(struct seq_file *p, int prec); |
f74596d0 | 614 | |
43a25632 | 615 | extern int early_irq_init(void); |
4a046d17 | 616 | extern int arch_probe_nr_irqs(void); |
43a25632 | 617 | extern int arch_early_irq_init(void); |
43a25632 | 618 | |
1da177e4 | 619 | #endif |