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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> |
cd7eab44 BH |
17 | #include <linux/kref.h> |
18 | #include <linux/workqueue.h> | |
0ebb26e7 | 19 | |
60063497 | 20 | #include <linux/atomic.h> |
1da177e4 | 21 | #include <asm/ptrace.h> |
1da177e4 | 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 | * | |
6932bf37 TG |
43 | * IRQF_DISABLED - keep irqs disabled when calling the action handler. |
44 | * DEPRECATED. This flag is a NOOP and scheduled to be removed | |
6e213616 TG |
45 | * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator |
46 | * IRQF_SHARED - allow sharing the irq among several devices | |
47 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur | |
48 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt | |
950f4427 TG |
49 | * IRQF_PERCPU - Interrupt is per cpu |
50 | * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing | |
d85a60d8 BW |
51 | * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is |
52 | * registered first in an shared interrupt is considered for | |
53 | * performance reasons) | |
b25c340c TG |
54 | * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished. |
55 | * Used by threaded interrupts which need to keep the | |
56 | * irq line disabled until the threaded handler has been run. | |
685fd0b4 | 57 | * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend |
dc5f219e | 58 | * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set |
0c4602ff | 59 | * IRQF_NO_THREAD - Interrupt cannot be threaded |
9bab0b7f IC |
60 | * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device |
61 | * resume time. | |
6e213616 TG |
62 | */ |
63 | #define IRQF_DISABLED 0x00000020 | |
64 | #define IRQF_SAMPLE_RANDOM 0x00000040 | |
65 | #define IRQF_SHARED 0x00000080 | |
66 | #define IRQF_PROBE_SHARED 0x00000100 | |
685fd0b4 | 67 | #define __IRQF_TIMER 0x00000200 |
284c6680 | 68 | #define IRQF_PERCPU 0x00000400 |
950f4427 | 69 | #define IRQF_NOBALANCING 0x00000800 |
d85a60d8 | 70 | #define IRQF_IRQPOLL 0x00001000 |
b25c340c | 71 | #define IRQF_ONESHOT 0x00002000 |
685fd0b4 | 72 | #define IRQF_NO_SUSPEND 0x00004000 |
dc5f219e | 73 | #define IRQF_FORCE_RESUME 0x00008000 |
0c4602ff | 74 | #define IRQF_NO_THREAD 0x00010000 |
9bab0b7f | 75 | #define IRQF_EARLY_RESUME 0x00020000 |
685fd0b4 | 76 | |
0c4602ff | 77 | #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) |
3aa551c9 | 78 | |
b4e6b097 | 79 | /* |
ae731f8d MZ |
80 | * These values can be returned by request_any_context_irq() and |
81 | * describe the context the interrupt will be run in. | |
82 | * | |
83 | * IRQC_IS_HARDIRQ - interrupt runs in hardirq context | |
84 | * IRQC_IS_NESTED - interrupt runs in a nested threaded context | |
85 | */ | |
86 | enum { | |
87 | IRQC_IS_HARDIRQ = 0, | |
88 | IRQC_IS_NESTED, | |
89 | }; | |
90 | ||
7d12e780 | 91 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 92 | |
a9d0a1a3 TG |
93 | /** |
94 | * struct irqaction - per interrupt action descriptor | |
95 | * @handler: interrupt handler function | |
a9d0a1a3 TG |
96 | * @name: name of the device |
97 | * @dev_id: cookie to identify the device | |
31d9d9b6 | 98 | * @percpu_dev_id: cookie to identify the device |
a9d0a1a3 TG |
99 | * @next: pointer to the next irqaction for shared interrupts |
100 | * @irq: interrupt number | |
c0ecaa06 | 101 | * @flags: flags (see IRQF_* above) |
25985edc | 102 | * @thread_fn: interrupt handler function for threaded interrupts |
3aa551c9 TG |
103 | * @thread: thread pointer for threaded interrupts |
104 | * @thread_flags: flags related to @thread | |
b5faba21 | 105 | * @thread_mask: bitmask for keeping track of @thread activity |
c0ecaa06 | 106 | * @dir: pointer to the proc/irq/NN/name entry |
a9d0a1a3 | 107 | */ |
1da177e4 | 108 | struct irqaction { |
31d9d9b6 | 109 | irq_handler_t handler; |
31d9d9b6 MZ |
110 | void *dev_id; |
111 | void __percpu *percpu_dev_id; | |
112 | struct irqaction *next; | |
31d9d9b6 MZ |
113 | irq_handler_t thread_fn; |
114 | struct task_struct *thread; | |
c0ecaa06 TG |
115 | unsigned int irq; |
116 | unsigned int flags; | |
31d9d9b6 MZ |
117 | unsigned long thread_flags; |
118 | unsigned long thread_mask; | |
119 | const char *name; | |
120 | struct proc_dir_entry *dir; | |
f6cd2477 | 121 | } ____cacheline_internodealigned_in_smp; |
1da177e4 | 122 | |
7d12e780 | 123 | extern irqreturn_t no_action(int cpl, void *dev_id); |
3aa551c9 | 124 | |
3a38148f | 125 | #ifdef CONFIG_GENERIC_HARDIRQS |
3aa551c9 TG |
126 | extern int __must_check |
127 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
128 | irq_handler_t thread_fn, | |
129 | unsigned long flags, const char *name, void *dev); | |
130 | ||
131 | static inline int __must_check | |
132 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
133 | const char *name, void *dev) | |
134 | { | |
135 | return request_threaded_irq(irq, handler, NULL, flags, name, dev); | |
136 | } | |
137 | ||
ae731f8d MZ |
138 | extern int __must_check |
139 | request_any_context_irq(unsigned int irq, irq_handler_t handler, | |
140 | unsigned long flags, const char *name, void *dev_id); | |
141 | ||
31d9d9b6 MZ |
142 | extern int __must_check |
143 | request_percpu_irq(unsigned int irq, irq_handler_t handler, | |
144 | const char *devname, void __percpu *percpu_dev_id); | |
3aa551c9 | 145 | #else |
3a38148f TG |
146 | |
147 | extern int __must_check | |
148 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
149 | const char *name, void *dev); | |
150 | ||
de18836e TG |
151 | /* |
152 | * Special function to avoid ifdeffery in kernel/irq/devres.c which | |
153 | * gets magically built by GENERIC_HARDIRQS=n architectures (sparc, | |
154 | * m68k). I really love these $@%#!* obvious Makefile references: | |
155 | * ../../../kernel/irq/devres.o | |
156 | */ | |
157 | static inline int __must_check | |
158 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
159 | irq_handler_t thread_fn, | |
160 | unsigned long flags, const char *name, void *dev) | |
161 | { | |
162 | return request_irq(irq, handler, flags, name, dev); | |
163 | } | |
164 | ||
ae731f8d MZ |
165 | static inline int __must_check |
166 | request_any_context_irq(unsigned int irq, irq_handler_t handler, | |
167 | unsigned long flags, const char *name, void *dev_id) | |
168 | { | |
169 | return request_irq(irq, handler, flags, name, dev_id); | |
170 | } | |
171 | ||
31d9d9b6 MZ |
172 | static inline int __must_check |
173 | request_percpu_irq(unsigned int irq, irq_handler_t handler, | |
174 | const char *devname, void __percpu *percpu_dev_id) | |
175 | { | |
176 | return request_irq(irq, handler, 0, devname, percpu_dev_id); | |
177 | } | |
3aa551c9 TG |
178 | #endif |
179 | ||
1da177e4 | 180 | extern void free_irq(unsigned int, void *); |
31d9d9b6 | 181 | extern void free_percpu_irq(unsigned int, void __percpu *); |
1da177e4 | 182 | |
0af3678f AV |
183 | struct device; |
184 | ||
935bd5b9 AV |
185 | extern int __must_check |
186 | devm_request_threaded_irq(struct device *dev, unsigned int irq, | |
187 | irq_handler_t handler, irq_handler_t thread_fn, | |
188 | unsigned long irqflags, const char *devname, | |
189 | void *dev_id); | |
190 | ||
191 | static inline int __must_check | |
192 | devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, | |
193 | unsigned long irqflags, const char *devname, void *dev_id) | |
194 | { | |
195 | return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, | |
196 | devname, dev_id); | |
197 | } | |
198 | ||
9ac7849e TH |
199 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); |
200 | ||
d7e9629d IM |
201 | /* |
202 | * On lockdep we dont want to enable hardirqs in hardirq | |
203 | * context. Use local_irq_enable_in_hardirq() to annotate | |
204 | * kernel code that has to do this nevertheless (pretty much | |
205 | * the only valid case is for old/broken hardware that is | |
206 | * insanely slow). | |
207 | * | |
208 | * NOTE: in theory this might break fragile code that relies | |
209 | * on hardirq delivery - in practice we dont seem to have such | |
210 | * places left. So the only effect should be slightly increased | |
211 | * irqs-off latencies. | |
212 | */ | |
213 | #ifdef CONFIG_LOCKDEP | |
214 | # define local_irq_enable_in_hardirq() do { } while (0) | |
215 | #else | |
216 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
217 | #endif | |
1da177e4 | 218 | |
1da177e4 LT |
219 | extern void disable_irq_nosync(unsigned int irq); |
220 | extern void disable_irq(unsigned int irq); | |
31d9d9b6 | 221 | extern void disable_percpu_irq(unsigned int irq); |
1da177e4 | 222 | extern void enable_irq(unsigned int irq); |
1e7c5fd2 | 223 | extern void enable_percpu_irq(unsigned int irq, unsigned int type); |
ba9a2331 | 224 | |
0a0c5168 | 225 | /* The following three functions are for the core kernel use only. */ |
5818a6e2 | 226 | #ifdef CONFIG_GENERIC_HARDIRQS |
0a0c5168 RW |
227 | extern void suspend_device_irqs(void); |
228 | extern void resume_device_irqs(void); | |
229 | #ifdef CONFIG_PM_SLEEP | |
230 | extern int check_wakeup_irqs(void); | |
231 | #else | |
232 | static inline int check_wakeup_irqs(void) { return 0; } | |
233 | #endif | |
5818a6e2 HC |
234 | #else |
235 | static inline void suspend_device_irqs(void) { }; | |
236 | static inline void resume_device_irqs(void) { }; | |
237 | static inline int check_wakeup_irqs(void) { return 0; } | |
0a0c5168 RW |
238 | #endif |
239 | ||
d7b90689 RK |
240 | #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS) |
241 | ||
d036e67b | 242 | extern cpumask_var_t irq_default_affinity; |
18404756 | 243 | |
0de26520 | 244 | extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask); |
d7b90689 | 245 | extern int irq_can_set_affinity(unsigned int irq); |
18404756 | 246 | extern int irq_select_affinity(unsigned int irq); |
d7b90689 | 247 | |
e7a297b0 | 248 | extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); |
cd7eab44 BH |
249 | |
250 | /** | |
251 | * struct irq_affinity_notify - context for notification of IRQ affinity changes | |
252 | * @irq: Interrupt to which notification applies | |
253 | * @kref: Reference count, for internal use | |
254 | * @work: Work item, for internal use | |
255 | * @notify: Function to be called on change. This will be | |
256 | * called in process context. | |
257 | * @release: Function to be called on release. This will be | |
258 | * called in process context. Once registered, the | |
259 | * structure must only be freed when this function is | |
260 | * called or later. | |
261 | */ | |
262 | struct irq_affinity_notify { | |
263 | unsigned int irq; | |
264 | struct kref kref; | |
265 | struct work_struct work; | |
266 | void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); | |
267 | void (*release)(struct kref *ref); | |
268 | }; | |
269 | ||
270 | extern int | |
271 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); | |
272 | ||
273 | static inline void irq_run_affinity_notifiers(void) | |
274 | { | |
275 | flush_scheduled_work(); | |
276 | } | |
277 | ||
d7b90689 RK |
278 | #else /* CONFIG_SMP */ |
279 | ||
0de26520 | 280 | static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) |
d7b90689 RK |
281 | { |
282 | return -EINVAL; | |
283 | } | |
284 | ||
285 | static inline int irq_can_set_affinity(unsigned int irq) | |
286 | { | |
287 | return 0; | |
288 | } | |
289 | ||
18404756 MK |
290 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
291 | ||
e7a297b0 | 292 | static inline int irq_set_affinity_hint(unsigned int irq, |
cd7eab44 | 293 | const struct cpumask *m) |
e7a297b0 PWJ |
294 | { |
295 | return -EINVAL; | |
296 | } | |
d7b90689 RK |
297 | #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */ |
298 | ||
e9ed7e72 | 299 | #ifdef CONFIG_GENERIC_HARDIRQS |
c01d403b IM |
300 | /* |
301 | * Special lockdep variants of irq disabling/enabling. | |
302 | * These should be used for locking constructs that | |
303 | * know that a particular irq context which is disabled, | |
304 | * and which is the only irq-context user of a lock, | |
305 | * that it's safe to take the lock in the irq-disabled | |
306 | * section without disabling hardirqs. | |
307 | * | |
308 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
309 | * irq disable/enable methods. | |
310 | */ | |
311 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
312 | { | |
313 | disable_irq_nosync(irq); | |
314 | #ifdef CONFIG_LOCKDEP | |
315 | local_irq_disable(); | |
316 | #endif | |
317 | } | |
318 | ||
e8106b94 AV |
319 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
320 | { | |
321 | disable_irq_nosync(irq); | |
322 | #ifdef CONFIG_LOCKDEP | |
323 | local_irq_save(*flags); | |
324 | #endif | |
325 | } | |
326 | ||
c01d403b IM |
327 | static inline void disable_irq_lockdep(unsigned int irq) |
328 | { | |
329 | disable_irq(irq); | |
330 | #ifdef CONFIG_LOCKDEP | |
331 | local_irq_disable(); | |
332 | #endif | |
333 | } | |
334 | ||
335 | static inline void enable_irq_lockdep(unsigned int irq) | |
336 | { | |
337 | #ifdef CONFIG_LOCKDEP | |
338 | local_irq_enable(); | |
339 | #endif | |
340 | enable_irq(irq); | |
341 | } | |
342 | ||
e8106b94 AV |
343 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
344 | { | |
345 | #ifdef CONFIG_LOCKDEP | |
346 | local_irq_restore(*flags); | |
347 | #endif | |
348 | enable_irq(irq); | |
349 | } | |
350 | ||
ba9a2331 | 351 | /* IRQ wakeup (PM) control: */ |
a0cd9ca2 TG |
352 | extern int irq_set_irq_wake(unsigned int irq, unsigned int on); |
353 | ||
ba9a2331 TG |
354 | static inline int enable_irq_wake(unsigned int irq) |
355 | { | |
a0cd9ca2 | 356 | return irq_set_irq_wake(irq, 1); |
ba9a2331 TG |
357 | } |
358 | ||
359 | static inline int disable_irq_wake(unsigned int irq) | |
360 | { | |
a0cd9ca2 | 361 | return irq_set_irq_wake(irq, 0); |
ba9a2331 TG |
362 | } |
363 | ||
c01d403b IM |
364 | #else /* !CONFIG_GENERIC_HARDIRQS */ |
365 | /* | |
366 | * NOTE: non-genirq architectures, if they want to support the lock | |
367 | * validator need to define the methods below in their asm/irq.h | |
368 | * files, under an #ifdef CONFIG_LOCKDEP section. | |
369 | */ | |
b3e2fd9c | 370 | #ifndef CONFIG_LOCKDEP |
c01d403b | 371 | # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq) |
b3e2fd9c RZ |
372 | # define disable_irq_nosync_lockdep_irqsave(irq, flags) \ |
373 | disable_irq_nosync(irq) | |
c01d403b IM |
374 | # define disable_irq_lockdep(irq) disable_irq(irq) |
375 | # define enable_irq_lockdep(irq) enable_irq(irq) | |
b3e2fd9c RZ |
376 | # define enable_irq_lockdep_irqrestore(irq, flags) \ |
377 | enable_irq(irq) | |
c01d403b IM |
378 | # endif |
379 | ||
aa5346a2 GL |
380 | static inline int enable_irq_wake(unsigned int irq) |
381 | { | |
382 | return 0; | |
383 | } | |
384 | ||
385 | static inline int disable_irq_wake(unsigned int irq) | |
386 | { | |
387 | return 0; | |
388 | } | |
c01d403b | 389 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 390 | |
8d32a307 TG |
391 | |
392 | #ifdef CONFIG_IRQ_FORCED_THREADING | |
393 | extern bool force_irqthreads; | |
394 | #else | |
395 | #define force_irqthreads (0) | |
396 | #endif | |
397 | ||
3f74478b AK |
398 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
399 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
400 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
401 | #endif | |
402 | ||
2d3fbbb3 BH |
403 | /* Some architectures might implement lazy enabling/disabling of |
404 | * interrupts. In some cases, such as stop_machine, we might want | |
405 | * to ensure that after a local_irq_disable(), interrupts have | |
406 | * really been disabled in hardware. Such architectures need to | |
407 | * implement the following hook. | |
408 | */ | |
409 | #ifndef hard_irq_disable | |
410 | #define hard_irq_disable() do { } while(0) | |
411 | #endif | |
412 | ||
1da177e4 LT |
413 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
414 | frequency threaded job scheduling. For almost all the purposes | |
415 | tasklets are more than enough. F.e. all serial device BHs et | |
416 | al. should be converted to tasklets, not to softirqs. | |
417 | */ | |
418 | ||
419 | enum | |
420 | { | |
421 | HI_SOFTIRQ=0, | |
422 | TIMER_SOFTIRQ, | |
423 | NET_TX_SOFTIRQ, | |
424 | NET_RX_SOFTIRQ, | |
ff856bad | 425 | BLOCK_SOFTIRQ, |
5e605b64 | 426 | BLOCK_IOPOLL_SOFTIRQ, |
c9819f45 CL |
427 | TASKLET_SOFTIRQ, |
428 | SCHED_SOFTIRQ, | |
a6037b61 | 429 | HRTIMER_SOFTIRQ, |
09223371 | 430 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ |
978b0116 AD |
431 | |
432 | NR_SOFTIRQS | |
1da177e4 LT |
433 | }; |
434 | ||
5d592b44 JB |
435 | /* map softirq index to softirq name. update 'softirq_to_name' in |
436 | * kernel/softirq.c when adding a new softirq. | |
437 | */ | |
438 | extern char *softirq_to_name[NR_SOFTIRQS]; | |
439 | ||
1da177e4 LT |
440 | /* softirq mask and active fields moved to irq_cpustat_t in |
441 | * asm/hardirq.h to get better cache usage. KAO | |
442 | */ | |
443 | ||
444 | struct softirq_action | |
445 | { | |
446 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
447 | }; |
448 | ||
449 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 450 | asmlinkage void __do_softirq(void); |
962cf36c | 451 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
1da177e4 | 452 | extern void softirq_init(void); |
f069686e | 453 | extern void __raise_softirq_irqoff(unsigned int nr); |
2bf2160d | 454 | |
b3c97528 HH |
455 | extern void raise_softirq_irqoff(unsigned int nr); |
456 | extern void raise_softirq(unsigned int nr); | |
1da177e4 | 457 | |
54514a70 DM |
458 | /* This is the worklist that queues up per-cpu softirq work. |
459 | * | |
460 | * send_remote_sendirq() adds work to these lists, and | |
461 | * the softirq handler itself dequeues from them. The queues | |
462 | * are protected by disabling local cpu interrupts and they must | |
463 | * only be accessed by the local cpu that they are for. | |
464 | */ | |
465 | DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list); | |
466 | ||
4dd53d89 VP |
467 | DECLARE_PER_CPU(struct task_struct *, ksoftirqd); |
468 | ||
469 | static inline struct task_struct *this_cpu_ksoftirqd(void) | |
470 | { | |
471 | return this_cpu_read(ksoftirqd); | |
472 | } | |
473 | ||
54514a70 DM |
474 | /* Try to send a softirq to a remote cpu. If this cannot be done, the |
475 | * work will be queued to the local cpu. | |
476 | */ | |
477 | extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq); | |
478 | ||
479 | /* Like send_remote_softirq(), but the caller must disable local cpu interrupts | |
480 | * and compute the current cpu, passed in as 'this_cpu'. | |
481 | */ | |
482 | extern void __send_remote_softirq(struct call_single_data *cp, int cpu, | |
483 | int this_cpu, int softirq); | |
1da177e4 LT |
484 | |
485 | /* Tasklets --- multithreaded analogue of BHs. | |
486 | ||
487 | Main feature differing them of generic softirqs: tasklet | |
488 | is running only on one CPU simultaneously. | |
489 | ||
490 | Main feature differing them of BHs: different tasklets | |
491 | may be run simultaneously on different CPUs. | |
492 | ||
493 | Properties: | |
494 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
495 | to be executed on some cpu at least once after this. | |
25985edc | 496 | * If the tasklet is already scheduled, but its execution is still not |
1da177e4 LT |
497 | started, it will be executed only once. |
498 | * If this tasklet is already running on another CPU (or schedule is called | |
499 | from tasklet itself), it is rescheduled for later. | |
500 | * Tasklet is strictly serialized wrt itself, but not | |
501 | wrt another tasklets. If client needs some intertask synchronization, | |
502 | he makes it with spinlocks. | |
503 | */ | |
504 | ||
505 | struct tasklet_struct | |
506 | { | |
507 | struct tasklet_struct *next; | |
508 | unsigned long state; | |
509 | atomic_t count; | |
510 | void (*func)(unsigned long); | |
511 | unsigned long data; | |
512 | }; | |
513 | ||
514 | #define DECLARE_TASKLET(name, func, data) \ | |
515 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
516 | ||
517 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
518 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
519 | ||
520 | ||
521 | enum | |
522 | { | |
523 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
524 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
525 | }; | |
526 | ||
527 | #ifdef CONFIG_SMP | |
528 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
529 | { | |
530 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
531 | } | |
532 | ||
533 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
534 | { | |
535 | smp_mb__before_clear_bit(); | |
536 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
537 | } | |
538 | ||
539 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
540 | { | |
541 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
542 | } | |
543 | #else | |
544 | #define tasklet_trylock(t) 1 | |
545 | #define tasklet_unlock_wait(t) do { } while (0) | |
546 | #define tasklet_unlock(t) do { } while (0) | |
547 | #endif | |
548 | ||
b3c97528 | 549 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
550 | |
551 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
552 | { | |
553 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
554 | __tasklet_schedule(t); | |
555 | } | |
556 | ||
b3c97528 | 557 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
558 | |
559 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
560 | { | |
561 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
562 | __tasklet_hi_schedule(t); | |
563 | } | |
564 | ||
7c692cba VN |
565 | extern void __tasklet_hi_schedule_first(struct tasklet_struct *t); |
566 | ||
567 | /* | |
568 | * This version avoids touching any other tasklets. Needed for kmemcheck | |
569 | * in order not to take any page faults while enqueueing this tasklet; | |
570 | * consider VERY carefully whether you really need this or | |
571 | * tasklet_hi_schedule()... | |
572 | */ | |
573 | static inline void tasklet_hi_schedule_first(struct tasklet_struct *t) | |
574 | { | |
575 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
576 | __tasklet_hi_schedule_first(t); | |
577 | } | |
578 | ||
1da177e4 LT |
579 | |
580 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
581 | { | |
582 | atomic_inc(&t->count); | |
583 | smp_mb__after_atomic_inc(); | |
584 | } | |
585 | ||
586 | static inline void tasklet_disable(struct tasklet_struct *t) | |
587 | { | |
588 | tasklet_disable_nosync(t); | |
589 | tasklet_unlock_wait(t); | |
590 | smp_mb(); | |
591 | } | |
592 | ||
593 | static inline void tasklet_enable(struct tasklet_struct *t) | |
594 | { | |
595 | smp_mb__before_atomic_dec(); | |
596 | atomic_dec(&t->count); | |
597 | } | |
598 | ||
599 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
600 | { | |
601 | smp_mb__before_atomic_dec(); | |
602 | atomic_dec(&t->count); | |
603 | } | |
604 | ||
605 | extern void tasklet_kill(struct tasklet_struct *t); | |
606 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
607 | extern void tasklet_init(struct tasklet_struct *t, | |
608 | void (*func)(unsigned long), unsigned long data); | |
609 | ||
9ba5f005 PZ |
610 | struct tasklet_hrtimer { |
611 | struct hrtimer timer; | |
612 | struct tasklet_struct tasklet; | |
613 | enum hrtimer_restart (*function)(struct hrtimer *); | |
614 | }; | |
615 | ||
616 | extern void | |
617 | tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, | |
618 | enum hrtimer_restart (*function)(struct hrtimer *), | |
619 | clockid_t which_clock, enum hrtimer_mode mode); | |
620 | ||
621 | static inline | |
622 | int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, | |
623 | const enum hrtimer_mode mode) | |
624 | { | |
625 | return hrtimer_start(&ttimer->timer, time, mode); | |
626 | } | |
627 | ||
628 | static inline | |
629 | void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) | |
630 | { | |
631 | hrtimer_cancel(&ttimer->timer); | |
632 | tasklet_kill(&ttimer->tasklet); | |
633 | } | |
634 | ||
1da177e4 LT |
635 | /* |
636 | * Autoprobing for irqs: | |
637 | * | |
638 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
639 | * for accurate IRQ probing during kernel initialization. They are | |
640 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
641 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
642 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
643 | * | |
644 | * For reasonably foolproof probing, use them as follows: | |
645 | * | |
646 | * 1. clear and/or mask the device's internal interrupt. | |
647 | * 2. sti(); | |
648 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
649 | * 4. enable the device and cause it to trigger an interrupt. | |
650 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
651 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
652 | * 7. service the device to clear its pending interrupt. | |
653 | * 8. loop again if paranoia is required. | |
654 | * | |
655 | * probe_irq_on() returns a mask of allocated irq's. | |
656 | * | |
657 | * probe_irq_off() takes the mask as a parameter, | |
658 | * and returns the irq number which occurred, | |
659 | * or zero if none occurred, or a negative irq number | |
660 | * if more than one irq occurred. | |
661 | */ | |
662 | ||
663 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
664 | static inline unsigned long probe_irq_on(void) | |
665 | { | |
666 | return 0; | |
667 | } | |
668 | static inline int probe_irq_off(unsigned long val) | |
669 | { | |
670 | return 0; | |
671 | } | |
672 | static inline unsigned int probe_irq_mask(unsigned long val) | |
673 | { | |
674 | return 0; | |
675 | } | |
676 | #else | |
677 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
678 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
679 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
680 | #endif | |
681 | ||
6168a702 AM |
682 | #ifdef CONFIG_PROC_FS |
683 | /* Initialize /proc/irq/ */ | |
684 | extern void init_irq_proc(void); | |
685 | #else | |
686 | static inline void init_irq_proc(void) | |
687 | { | |
688 | } | |
689 | #endif | |
690 | ||
d43c36dc | 691 | struct seq_file; |
f74596d0 | 692 | int show_interrupts(struct seq_file *p, void *v); |
c78b9b65 | 693 | int arch_show_interrupts(struct seq_file *p, int prec); |
f74596d0 | 694 | |
43a25632 | 695 | extern int early_irq_init(void); |
4a046d17 | 696 | extern int arch_probe_nr_irqs(void); |
43a25632 | 697 | extern int arch_early_irq_init(void); |
43a25632 | 698 | |
1da177e4 | 699 | #endif |