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> |
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 | |
1da177e4 LT |
20 | #include <asm/atomic.h> |
21 | #include <asm/ptrace.h> | |
22 | #include <asm/system.h> | |
2bf2160d | 23 | #include <trace/events/irq.h> |
1da177e4 | 24 | |
6e213616 TG |
25 | /* |
26 | * These correspond to the IORESOURCE_IRQ_* defines in | |
27 | * linux/ioport.h to select the interrupt line behaviour. When | |
28 | * requesting an interrupt without specifying a IRQF_TRIGGER, the | |
29 | * setting should be assumed to be "as already configured", which | |
30 | * may be as per machine or firmware initialisation. | |
31 | */ | |
32 | #define IRQF_TRIGGER_NONE 0x00000000 | |
33 | #define IRQF_TRIGGER_RISING 0x00000001 | |
34 | #define IRQF_TRIGGER_FALLING 0x00000002 | |
35 | #define IRQF_TRIGGER_HIGH 0x00000004 | |
36 | #define IRQF_TRIGGER_LOW 0x00000008 | |
37 | #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \ | |
38 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING) | |
39 | #define IRQF_TRIGGER_PROBE 0x00000010 | |
40 | ||
41 | /* | |
42 | * These flags used only by the kernel as part of the | |
43 | * irq handling routines. | |
44 | * | |
6932bf37 TG |
45 | * IRQF_DISABLED - keep irqs disabled when calling the action handler. |
46 | * DEPRECATED. This flag is a NOOP and scheduled to be removed | |
6e213616 TG |
47 | * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator |
48 | * IRQF_SHARED - allow sharing the irq among several devices | |
49 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur | |
50 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt | |
950f4427 TG |
51 | * IRQF_PERCPU - Interrupt is per cpu |
52 | * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing | |
d85a60d8 BW |
53 | * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is |
54 | * registered first in an shared interrupt is considered for | |
55 | * performance reasons) | |
b25c340c TG |
56 | * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished. |
57 | * Used by threaded interrupts which need to keep the | |
58 | * irq line disabled until the threaded handler has been run. | |
685fd0b4 | 59 | * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend |
dc5f219e | 60 | * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set |
0c4602ff | 61 | * IRQF_NO_THREAD - Interrupt cannot be threaded |
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 |
685fd0b4 | 75 | |
0c4602ff | 76 | #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) |
3aa551c9 | 77 | |
b4e6b097 | 78 | /* |
ae731f8d MZ |
79 | * These values can be returned by request_any_context_irq() and |
80 | * describe the context the interrupt will be run in. | |
81 | * | |
82 | * IRQC_IS_HARDIRQ - interrupt runs in hardirq context | |
83 | * IRQC_IS_NESTED - interrupt runs in a nested threaded context | |
84 | */ | |
85 | enum { | |
86 | IRQC_IS_HARDIRQ = 0, | |
87 | IRQC_IS_NESTED, | |
88 | }; | |
89 | ||
7d12e780 | 90 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 91 | |
a9d0a1a3 TG |
92 | /** |
93 | * struct irqaction - per interrupt action descriptor | |
94 | * @handler: interrupt handler function | |
95 | * @flags: flags (see IRQF_* above) | |
a9d0a1a3 TG |
96 | * @name: name of the device |
97 | * @dev_id: cookie to identify the device | |
98 | * @next: pointer to the next irqaction for shared interrupts | |
99 | * @irq: interrupt number | |
100 | * @dir: pointer to the proc/irq/NN/name entry | |
3aa551c9 TG |
101 | * @thread_fn: interupt handler function for threaded interrupts |
102 | * @thread: thread pointer for threaded interrupts | |
103 | * @thread_flags: flags related to @thread | |
b5faba21 | 104 | * @thread_mask: bitmask for keeping track of @thread activity |
a9d0a1a3 | 105 | */ |
1da177e4 | 106 | struct irqaction { |
da482792 | 107 | irq_handler_t handler; |
1da177e4 | 108 | unsigned long flags; |
1da177e4 LT |
109 | void *dev_id; |
110 | struct irqaction *next; | |
111 | int irq; | |
3aa551c9 TG |
112 | irq_handler_t thread_fn; |
113 | struct task_struct *thread; | |
114 | unsigned long thread_flags; | |
b5faba21 | 115 | unsigned long thread_mask; |
f6cd2477 ED |
116 | const char *name; |
117 | struct proc_dir_entry *dir; | |
118 | } ____cacheline_internodealigned_in_smp; | |
1da177e4 | 119 | |
7d12e780 | 120 | extern irqreturn_t no_action(int cpl, void *dev_id); |
3aa551c9 | 121 | |
3a38148f | 122 | #ifdef CONFIG_GENERIC_HARDIRQS |
3aa551c9 TG |
123 | extern int __must_check |
124 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
125 | irq_handler_t thread_fn, | |
126 | unsigned long flags, const char *name, void *dev); | |
127 | ||
128 | static inline int __must_check | |
129 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
130 | const char *name, void *dev) | |
131 | { | |
132 | return request_threaded_irq(irq, handler, NULL, flags, name, dev); | |
133 | } | |
134 | ||
ae731f8d MZ |
135 | extern int __must_check |
136 | request_any_context_irq(unsigned int irq, irq_handler_t handler, | |
137 | unsigned long flags, const char *name, void *dev_id); | |
138 | ||
3aa551c9 TG |
139 | extern void exit_irq_thread(void); |
140 | #else | |
3a38148f TG |
141 | |
142 | extern int __must_check | |
143 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, | |
144 | const char *name, void *dev); | |
145 | ||
de18836e TG |
146 | /* |
147 | * Special function to avoid ifdeffery in kernel/irq/devres.c which | |
148 | * gets magically built by GENERIC_HARDIRQS=n architectures (sparc, | |
149 | * m68k). I really love these $@%#!* obvious Makefile references: | |
150 | * ../../../kernel/irq/devres.o | |
151 | */ | |
152 | static inline int __must_check | |
153 | request_threaded_irq(unsigned int irq, irq_handler_t handler, | |
154 | irq_handler_t thread_fn, | |
155 | unsigned long flags, const char *name, void *dev) | |
156 | { | |
157 | return request_irq(irq, handler, flags, name, dev); | |
158 | } | |
159 | ||
ae731f8d MZ |
160 | static inline int __must_check |
161 | request_any_context_irq(unsigned int irq, irq_handler_t handler, | |
162 | unsigned long flags, const char *name, void *dev_id) | |
163 | { | |
164 | return request_irq(irq, handler, flags, name, dev_id); | |
165 | } | |
166 | ||
3aa551c9 TG |
167 | static inline void exit_irq_thread(void) { } |
168 | #endif | |
169 | ||
1da177e4 LT |
170 | extern void free_irq(unsigned int, void *); |
171 | ||
0af3678f AV |
172 | struct device; |
173 | ||
935bd5b9 AV |
174 | extern int __must_check |
175 | devm_request_threaded_irq(struct device *dev, unsigned int irq, | |
176 | irq_handler_t handler, irq_handler_t thread_fn, | |
177 | unsigned long irqflags, const char *devname, | |
178 | void *dev_id); | |
179 | ||
180 | static inline int __must_check | |
181 | devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, | |
182 | unsigned long irqflags, const char *devname, void *dev_id) | |
183 | { | |
184 | return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, | |
185 | devname, dev_id); | |
186 | } | |
187 | ||
9ac7849e TH |
188 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); |
189 | ||
d7e9629d IM |
190 | /* |
191 | * On lockdep we dont want to enable hardirqs in hardirq | |
192 | * context. Use local_irq_enable_in_hardirq() to annotate | |
193 | * kernel code that has to do this nevertheless (pretty much | |
194 | * the only valid case is for old/broken hardware that is | |
195 | * insanely slow). | |
196 | * | |
197 | * NOTE: in theory this might break fragile code that relies | |
198 | * on hardirq delivery - in practice we dont seem to have such | |
199 | * places left. So the only effect should be slightly increased | |
200 | * irqs-off latencies. | |
201 | */ | |
202 | #ifdef CONFIG_LOCKDEP | |
203 | # define local_irq_enable_in_hardirq() do { } while (0) | |
204 | #else | |
205 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
206 | #endif | |
1da177e4 | 207 | |
1da177e4 LT |
208 | extern void disable_irq_nosync(unsigned int irq); |
209 | extern void disable_irq(unsigned int irq); | |
210 | extern void enable_irq(unsigned int irq); | |
ba9a2331 | 211 | |
0a0c5168 | 212 | /* The following three functions are for the core kernel use only. */ |
5818a6e2 | 213 | #ifdef CONFIG_GENERIC_HARDIRQS |
0a0c5168 RW |
214 | extern void suspend_device_irqs(void); |
215 | extern void resume_device_irqs(void); | |
216 | #ifdef CONFIG_PM_SLEEP | |
217 | extern int check_wakeup_irqs(void); | |
218 | #else | |
219 | static inline int check_wakeup_irqs(void) { return 0; } | |
220 | #endif | |
5818a6e2 HC |
221 | #else |
222 | static inline void suspend_device_irqs(void) { }; | |
223 | static inline void resume_device_irqs(void) { }; | |
224 | static inline int check_wakeup_irqs(void) { return 0; } | |
0a0c5168 RW |
225 | #endif |
226 | ||
d7b90689 RK |
227 | #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS) |
228 | ||
d036e67b | 229 | extern cpumask_var_t irq_default_affinity; |
18404756 | 230 | |
0de26520 | 231 | extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask); |
d7b90689 | 232 | extern int irq_can_set_affinity(unsigned int irq); |
18404756 | 233 | extern int irq_select_affinity(unsigned int irq); |
d7b90689 | 234 | |
e7a297b0 | 235 | extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); |
cd7eab44 BH |
236 | |
237 | /** | |
238 | * struct irq_affinity_notify - context for notification of IRQ affinity changes | |
239 | * @irq: Interrupt to which notification applies | |
240 | * @kref: Reference count, for internal use | |
241 | * @work: Work item, for internal use | |
242 | * @notify: Function to be called on change. This will be | |
243 | * called in process context. | |
244 | * @release: Function to be called on release. This will be | |
245 | * called in process context. Once registered, the | |
246 | * structure must only be freed when this function is | |
247 | * called or later. | |
248 | */ | |
249 | struct irq_affinity_notify { | |
250 | unsigned int irq; | |
251 | struct kref kref; | |
252 | struct work_struct work; | |
253 | void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); | |
254 | void (*release)(struct kref *ref); | |
255 | }; | |
256 | ||
257 | extern int | |
258 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); | |
259 | ||
260 | static inline void irq_run_affinity_notifiers(void) | |
261 | { | |
262 | flush_scheduled_work(); | |
263 | } | |
264 | ||
d7b90689 RK |
265 | #else /* CONFIG_SMP */ |
266 | ||
0de26520 | 267 | static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) |
d7b90689 RK |
268 | { |
269 | return -EINVAL; | |
270 | } | |
271 | ||
272 | static inline int irq_can_set_affinity(unsigned int irq) | |
273 | { | |
274 | return 0; | |
275 | } | |
276 | ||
18404756 MK |
277 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
278 | ||
e7a297b0 | 279 | static inline int irq_set_affinity_hint(unsigned int irq, |
cd7eab44 | 280 | const struct cpumask *m) |
e7a297b0 PWJ |
281 | { |
282 | return -EINVAL; | |
283 | } | |
d7b90689 RK |
284 | #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */ |
285 | ||
e9ed7e72 | 286 | #ifdef CONFIG_GENERIC_HARDIRQS |
c01d403b IM |
287 | /* |
288 | * Special lockdep variants of irq disabling/enabling. | |
289 | * These should be used for locking constructs that | |
290 | * know that a particular irq context which is disabled, | |
291 | * and which is the only irq-context user of a lock, | |
292 | * that it's safe to take the lock in the irq-disabled | |
293 | * section without disabling hardirqs. | |
294 | * | |
295 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
296 | * irq disable/enable methods. | |
297 | */ | |
298 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
299 | { | |
300 | disable_irq_nosync(irq); | |
301 | #ifdef CONFIG_LOCKDEP | |
302 | local_irq_disable(); | |
303 | #endif | |
304 | } | |
305 | ||
e8106b94 AV |
306 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
307 | { | |
308 | disable_irq_nosync(irq); | |
309 | #ifdef CONFIG_LOCKDEP | |
310 | local_irq_save(*flags); | |
311 | #endif | |
312 | } | |
313 | ||
c01d403b IM |
314 | static inline void disable_irq_lockdep(unsigned int irq) |
315 | { | |
316 | disable_irq(irq); | |
317 | #ifdef CONFIG_LOCKDEP | |
318 | local_irq_disable(); | |
319 | #endif | |
320 | } | |
321 | ||
322 | static inline void enable_irq_lockdep(unsigned int irq) | |
323 | { | |
324 | #ifdef CONFIG_LOCKDEP | |
325 | local_irq_enable(); | |
326 | #endif | |
327 | enable_irq(irq); | |
328 | } | |
329 | ||
e8106b94 AV |
330 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
331 | { | |
332 | #ifdef CONFIG_LOCKDEP | |
333 | local_irq_restore(*flags); | |
334 | #endif | |
335 | enable_irq(irq); | |
336 | } | |
337 | ||
ba9a2331 | 338 | /* IRQ wakeup (PM) control: */ |
a0cd9ca2 TG |
339 | extern int irq_set_irq_wake(unsigned int irq, unsigned int on); |
340 | ||
341 | #ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT | |
342 | /* Please do not use: Use the replacement functions instead */ | |
343 | static inline int set_irq_wake(unsigned int irq, unsigned int on) | |
344 | { | |
345 | return irq_set_irq_wake(irq, on); | |
346 | } | |
347 | #endif | |
ba9a2331 TG |
348 | |
349 | static inline int enable_irq_wake(unsigned int irq) | |
350 | { | |
a0cd9ca2 | 351 | return irq_set_irq_wake(irq, 1); |
ba9a2331 TG |
352 | } |
353 | ||
354 | static inline int disable_irq_wake(unsigned int irq) | |
355 | { | |
a0cd9ca2 | 356 | return irq_set_irq_wake(irq, 0); |
ba9a2331 TG |
357 | } |
358 | ||
c01d403b IM |
359 | #else /* !CONFIG_GENERIC_HARDIRQS */ |
360 | /* | |
361 | * NOTE: non-genirq architectures, if they want to support the lock | |
362 | * validator need to define the methods below in their asm/irq.h | |
363 | * files, under an #ifdef CONFIG_LOCKDEP section. | |
364 | */ | |
b3e2fd9c | 365 | #ifndef CONFIG_LOCKDEP |
c01d403b | 366 | # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq) |
b3e2fd9c RZ |
367 | # define disable_irq_nosync_lockdep_irqsave(irq, flags) \ |
368 | disable_irq_nosync(irq) | |
c01d403b IM |
369 | # define disable_irq_lockdep(irq) disable_irq(irq) |
370 | # define enable_irq_lockdep(irq) enable_irq(irq) | |
b3e2fd9c RZ |
371 | # define enable_irq_lockdep_irqrestore(irq, flags) \ |
372 | enable_irq(irq) | |
c01d403b IM |
373 | # endif |
374 | ||
aa5346a2 GL |
375 | static inline int enable_irq_wake(unsigned int irq) |
376 | { | |
377 | return 0; | |
378 | } | |
379 | ||
380 | static inline int disable_irq_wake(unsigned int irq) | |
381 | { | |
382 | return 0; | |
383 | } | |
c01d403b | 384 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 385 | |
8d32a307 TG |
386 | |
387 | #ifdef CONFIG_IRQ_FORCED_THREADING | |
388 | extern bool force_irqthreads; | |
389 | #else | |
390 | #define force_irqthreads (0) | |
391 | #endif | |
392 | ||
3f74478b AK |
393 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
394 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
395 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
396 | #endif | |
397 | ||
2d3fbbb3 BH |
398 | /* Some architectures might implement lazy enabling/disabling of |
399 | * interrupts. In some cases, such as stop_machine, we might want | |
400 | * to ensure that after a local_irq_disable(), interrupts have | |
401 | * really been disabled in hardware. Such architectures need to | |
402 | * implement the following hook. | |
403 | */ | |
404 | #ifndef hard_irq_disable | |
405 | #define hard_irq_disable() do { } while(0) | |
406 | #endif | |
407 | ||
1da177e4 LT |
408 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
409 | frequency threaded job scheduling. For almost all the purposes | |
410 | tasklets are more than enough. F.e. all serial device BHs et | |
411 | al. should be converted to tasklets, not to softirqs. | |
412 | */ | |
413 | ||
414 | enum | |
415 | { | |
416 | HI_SOFTIRQ=0, | |
417 | TIMER_SOFTIRQ, | |
418 | NET_TX_SOFTIRQ, | |
419 | NET_RX_SOFTIRQ, | |
ff856bad | 420 | BLOCK_SOFTIRQ, |
5e605b64 | 421 | BLOCK_IOPOLL_SOFTIRQ, |
c9819f45 CL |
422 | TASKLET_SOFTIRQ, |
423 | SCHED_SOFTIRQ, | |
a6037b61 PZ |
424 | HRTIMER_SOFTIRQ, |
425 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ | |
978b0116 AD |
426 | |
427 | NR_SOFTIRQS | |
1da177e4 LT |
428 | }; |
429 | ||
5d592b44 JB |
430 | /* map softirq index to softirq name. update 'softirq_to_name' in |
431 | * kernel/softirq.c when adding a new softirq. | |
432 | */ | |
433 | extern char *softirq_to_name[NR_SOFTIRQS]; | |
434 | ||
1da177e4 LT |
435 | /* softirq mask and active fields moved to irq_cpustat_t in |
436 | * asm/hardirq.h to get better cache usage. KAO | |
437 | */ | |
438 | ||
439 | struct softirq_action | |
440 | { | |
441 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
442 | }; |
443 | ||
444 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 445 | asmlinkage void __do_softirq(void); |
962cf36c | 446 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
1da177e4 | 447 | extern void softirq_init(void); |
2bf2160d LJ |
448 | static inline void __raise_softirq_irqoff(unsigned int nr) |
449 | { | |
f4bc6bb2 | 450 | trace_softirq_raise(nr); |
2bf2160d LJ |
451 | or_softirq_pending(1UL << nr); |
452 | } | |
453 | ||
b3c97528 HH |
454 | extern void raise_softirq_irqoff(unsigned int nr); |
455 | extern void raise_softirq(unsigned int nr); | |
1da177e4 | 456 | |
54514a70 DM |
457 | /* This is the worklist that queues up per-cpu softirq work. |
458 | * | |
459 | * send_remote_sendirq() adds work to these lists, and | |
460 | * the softirq handler itself dequeues from them. The queues | |
461 | * are protected by disabling local cpu interrupts and they must | |
462 | * only be accessed by the local cpu that they are for. | |
463 | */ | |
464 | DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list); | |
465 | ||
4dd53d89 VP |
466 | DECLARE_PER_CPU(struct task_struct *, ksoftirqd); |
467 | ||
468 | static inline struct task_struct *this_cpu_ksoftirqd(void) | |
469 | { | |
470 | return this_cpu_read(ksoftirqd); | |
471 | } | |
472 | ||
54514a70 DM |
473 | /* Try to send a softirq to a remote cpu. If this cannot be done, the |
474 | * work will be queued to the local cpu. | |
475 | */ | |
476 | extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq); | |
477 | ||
478 | /* Like send_remote_softirq(), but the caller must disable local cpu interrupts | |
479 | * and compute the current cpu, passed in as 'this_cpu'. | |
480 | */ | |
481 | extern void __send_remote_softirq(struct call_single_data *cp, int cpu, | |
482 | int this_cpu, int softirq); | |
1da177e4 LT |
483 | |
484 | /* Tasklets --- multithreaded analogue of BHs. | |
485 | ||
486 | Main feature differing them of generic softirqs: tasklet | |
487 | is running only on one CPU simultaneously. | |
488 | ||
489 | Main feature differing them of BHs: different tasklets | |
490 | may be run simultaneously on different CPUs. | |
491 | ||
492 | Properties: | |
493 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
494 | to be executed on some cpu at least once after this. | |
495 | * If the tasklet is already scheduled, but its excecution is still not | |
496 | started, it will be executed only once. | |
497 | * If this tasklet is already running on another CPU (or schedule is called | |
498 | from tasklet itself), it is rescheduled for later. | |
499 | * Tasklet is strictly serialized wrt itself, but not | |
500 | wrt another tasklets. If client needs some intertask synchronization, | |
501 | he makes it with spinlocks. | |
502 | */ | |
503 | ||
504 | struct tasklet_struct | |
505 | { | |
506 | struct tasklet_struct *next; | |
507 | unsigned long state; | |
508 | atomic_t count; | |
509 | void (*func)(unsigned long); | |
510 | unsigned long data; | |
511 | }; | |
512 | ||
513 | #define DECLARE_TASKLET(name, func, data) \ | |
514 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
515 | ||
516 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
517 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
518 | ||
519 | ||
520 | enum | |
521 | { | |
522 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
523 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
524 | }; | |
525 | ||
526 | #ifdef CONFIG_SMP | |
527 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
528 | { | |
529 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
530 | } | |
531 | ||
532 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
533 | { | |
534 | smp_mb__before_clear_bit(); | |
535 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
536 | } | |
537 | ||
538 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
539 | { | |
540 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
541 | } | |
542 | #else | |
543 | #define tasklet_trylock(t) 1 | |
544 | #define tasklet_unlock_wait(t) do { } while (0) | |
545 | #define tasklet_unlock(t) do { } while (0) | |
546 | #endif | |
547 | ||
b3c97528 | 548 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
549 | |
550 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
551 | { | |
552 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
553 | __tasklet_schedule(t); | |
554 | } | |
555 | ||
b3c97528 | 556 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
557 | |
558 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
559 | { | |
560 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
561 | __tasklet_hi_schedule(t); | |
562 | } | |
563 | ||
7c692cba VN |
564 | extern void __tasklet_hi_schedule_first(struct tasklet_struct *t); |
565 | ||
566 | /* | |
567 | * This version avoids touching any other tasklets. Needed for kmemcheck | |
568 | * in order not to take any page faults while enqueueing this tasklet; | |
569 | * consider VERY carefully whether you really need this or | |
570 | * tasklet_hi_schedule()... | |
571 | */ | |
572 | static inline void tasklet_hi_schedule_first(struct tasklet_struct *t) | |
573 | { | |
574 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
575 | __tasklet_hi_schedule_first(t); | |
576 | } | |
577 | ||
1da177e4 LT |
578 | |
579 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
580 | { | |
581 | atomic_inc(&t->count); | |
582 | smp_mb__after_atomic_inc(); | |
583 | } | |
584 | ||
585 | static inline void tasklet_disable(struct tasklet_struct *t) | |
586 | { | |
587 | tasklet_disable_nosync(t); | |
588 | tasklet_unlock_wait(t); | |
589 | smp_mb(); | |
590 | } | |
591 | ||
592 | static inline void tasklet_enable(struct tasklet_struct *t) | |
593 | { | |
594 | smp_mb__before_atomic_dec(); | |
595 | atomic_dec(&t->count); | |
596 | } | |
597 | ||
598 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
599 | { | |
600 | smp_mb__before_atomic_dec(); | |
601 | atomic_dec(&t->count); | |
602 | } | |
603 | ||
604 | extern void tasklet_kill(struct tasklet_struct *t); | |
605 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
606 | extern void tasklet_init(struct tasklet_struct *t, | |
607 | void (*func)(unsigned long), unsigned long data); | |
608 | ||
9ba5f005 PZ |
609 | struct tasklet_hrtimer { |
610 | struct hrtimer timer; | |
611 | struct tasklet_struct tasklet; | |
612 | enum hrtimer_restart (*function)(struct hrtimer *); | |
613 | }; | |
614 | ||
615 | extern void | |
616 | tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, | |
617 | enum hrtimer_restart (*function)(struct hrtimer *), | |
618 | clockid_t which_clock, enum hrtimer_mode mode); | |
619 | ||
620 | static inline | |
621 | int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, | |
622 | const enum hrtimer_mode mode) | |
623 | { | |
624 | return hrtimer_start(&ttimer->timer, time, mode); | |
625 | } | |
626 | ||
627 | static inline | |
628 | void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) | |
629 | { | |
630 | hrtimer_cancel(&ttimer->timer); | |
631 | tasklet_kill(&ttimer->tasklet); | |
632 | } | |
633 | ||
1da177e4 LT |
634 | /* |
635 | * Autoprobing for irqs: | |
636 | * | |
637 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
638 | * for accurate IRQ probing during kernel initialization. They are | |
639 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
640 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
641 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
642 | * | |
643 | * For reasonably foolproof probing, use them as follows: | |
644 | * | |
645 | * 1. clear and/or mask the device's internal interrupt. | |
646 | * 2. sti(); | |
647 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
648 | * 4. enable the device and cause it to trigger an interrupt. | |
649 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
650 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
651 | * 7. service the device to clear its pending interrupt. | |
652 | * 8. loop again if paranoia is required. | |
653 | * | |
654 | * probe_irq_on() returns a mask of allocated irq's. | |
655 | * | |
656 | * probe_irq_off() takes the mask as a parameter, | |
657 | * and returns the irq number which occurred, | |
658 | * or zero if none occurred, or a negative irq number | |
659 | * if more than one irq occurred. | |
660 | */ | |
661 | ||
662 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
663 | static inline unsigned long probe_irq_on(void) | |
664 | { | |
665 | return 0; | |
666 | } | |
667 | static inline int probe_irq_off(unsigned long val) | |
668 | { | |
669 | return 0; | |
670 | } | |
671 | static inline unsigned int probe_irq_mask(unsigned long val) | |
672 | { | |
673 | return 0; | |
674 | } | |
675 | #else | |
676 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
677 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
678 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
679 | #endif | |
680 | ||
6168a702 AM |
681 | #ifdef CONFIG_PROC_FS |
682 | /* Initialize /proc/irq/ */ | |
683 | extern void init_irq_proc(void); | |
684 | #else | |
685 | static inline void init_irq_proc(void) | |
686 | { | |
687 | } | |
688 | #endif | |
689 | ||
d43c36dc | 690 | struct seq_file; |
f74596d0 | 691 | int show_interrupts(struct seq_file *p, void *v); |
c78b9b65 | 692 | int arch_show_interrupts(struct seq_file *p, int prec); |
f74596d0 | 693 | |
43a25632 | 694 | extern int early_irq_init(void); |
4a046d17 | 695 | extern int arch_probe_nr_irqs(void); |
43a25632 | 696 | extern int arch_early_irq_init(void); |
43a25632 | 697 | |
1da177e4 | 698 | #endif |