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 | * | |
6e213616 TG |
42 | * IRQF_SHARED - allow sharing the irq among several devices |
43 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur | |
44 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt | |
950f4427 TG |
45 | * IRQF_PERCPU - Interrupt is per cpu |
46 | * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing | |
d85a60d8 BW |
47 | * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is |
48 | * registered first in an shared interrupt is considered for | |
49 | * performance reasons) | |
b25c340c TG |
50 | * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished. |
51 | * Used by threaded interrupts which need to keep the | |
52 | * irq line disabled until the threaded handler has been run. | |
737eb030 MR |
53 | * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend. Does not guarantee |
54 | * that this interrupt will wake the system from a suspended | |
55 | * state. See Documentation/power/suspend-and-interrupts.txt | |
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. | |
17f48034 RW |
60 | * IRQF_COND_SUSPEND - If the IRQ is shared with a NO_SUSPEND user, execute this |
61 | * interrupt handler after suspending interrupts. For system | |
62 | * wakeup devices users need to implement wakeup detection in | |
63 | * their interrupt handlers. | |
6e213616 | 64 | */ |
6e213616 TG |
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 |
17f48034 | 76 | #define IRQF_COND_SUSPEND 0x00040000 |
685fd0b4 | 77 | |
0c4602ff | 78 | #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) |
3aa551c9 | 79 | |
b4e6b097 | 80 | /* |
ae731f8d MZ |
81 | * These values can be returned by request_any_context_irq() and |
82 | * describe the context the interrupt will be run in. | |
83 | * | |
84 | * IRQC_IS_HARDIRQ - interrupt runs in hardirq context | |
85 | * IRQC_IS_NESTED - interrupt runs in a nested threaded context | |
86 | */ | |
87 | enum { | |
88 | IRQC_IS_HARDIRQ = 0, | |
89 | IRQC_IS_NESTED, | |
90 | }; | |
91 | ||
7d12e780 | 92 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 93 | |
a9d0a1a3 TG |
94 | /** |
95 | * struct irqaction - per interrupt action descriptor | |
96 | * @handler: interrupt handler function | |
a9d0a1a3 TG |
97 | * @name: name of the device |
98 | * @dev_id: cookie to identify the device | |
31d9d9b6 | 99 | * @percpu_dev_id: cookie to identify the device |
a9d0a1a3 TG |
100 | * @next: pointer to the next irqaction for shared interrupts |
101 | * @irq: interrupt number | |
c0ecaa06 | 102 | * @flags: flags (see IRQF_* above) |
25985edc | 103 | * @thread_fn: interrupt handler function for threaded interrupts |
3aa551c9 TG |
104 | * @thread: thread pointer for threaded interrupts |
105 | * @thread_flags: flags related to @thread | |
b5faba21 | 106 | * @thread_mask: bitmask for keeping track of @thread activity |
c0ecaa06 | 107 | * @dir: pointer to the proc/irq/NN/name entry |
a9d0a1a3 | 108 | */ |
1da177e4 | 109 | struct irqaction { |
31d9d9b6 | 110 | irq_handler_t handler; |
31d9d9b6 MZ |
111 | void *dev_id; |
112 | void __percpu *percpu_dev_id; | |
113 | struct irqaction *next; | |
31d9d9b6 MZ |
114 | irq_handler_t thread_fn; |
115 | struct task_struct *thread; | |
c0ecaa06 TG |
116 | unsigned int irq; |
117 | unsigned int flags; | |
31d9d9b6 MZ |
118 | unsigned long thread_flags; |
119 | unsigned long thread_mask; | |
120 | const char *name; | |
121 | struct proc_dir_entry *dir; | |
f6cd2477 | 122 | } ____cacheline_internodealigned_in_smp; |
1da177e4 | 123 | |
7d12e780 | 124 | extern irqreturn_t no_action(int cpl, void *dev_id); |
3aa551c9 TG |
125 | |
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 | |
1da177e4 | 146 | extern void free_irq(unsigned int, void *); |
31d9d9b6 | 147 | extern void free_percpu_irq(unsigned int, void __percpu *); |
1da177e4 | 148 | |
0af3678f AV |
149 | struct device; |
150 | ||
935bd5b9 AV |
151 | extern int __must_check |
152 | devm_request_threaded_irq(struct device *dev, unsigned int irq, | |
153 | irq_handler_t handler, irq_handler_t thread_fn, | |
154 | unsigned long irqflags, const char *devname, | |
155 | void *dev_id); | |
156 | ||
157 | static inline int __must_check | |
158 | devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, | |
159 | unsigned long irqflags, const char *devname, void *dev_id) | |
160 | { | |
161 | return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, | |
162 | devname, dev_id); | |
163 | } | |
164 | ||
0668d306 SB |
165 | extern int __must_check |
166 | devm_request_any_context_irq(struct device *dev, unsigned int irq, | |
167 | irq_handler_t handler, unsigned long irqflags, | |
168 | const char *devname, void *dev_id); | |
169 | ||
9ac7849e TH |
170 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); |
171 | ||
d7e9629d IM |
172 | /* |
173 | * On lockdep we dont want to enable hardirqs in hardirq | |
174 | * context. Use local_irq_enable_in_hardirq() to annotate | |
175 | * kernel code that has to do this nevertheless (pretty much | |
176 | * the only valid case is for old/broken hardware that is | |
177 | * insanely slow). | |
178 | * | |
179 | * NOTE: in theory this might break fragile code that relies | |
180 | * on hardirq delivery - in practice we dont seem to have such | |
181 | * places left. So the only effect should be slightly increased | |
182 | * irqs-off latencies. | |
183 | */ | |
184 | #ifdef CONFIG_LOCKDEP | |
185 | # define local_irq_enable_in_hardirq() do { } while (0) | |
186 | #else | |
187 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
188 | #endif | |
1da177e4 | 189 | |
1da177e4 | 190 | extern void disable_irq_nosync(unsigned int irq); |
02cea395 | 191 | extern bool disable_hardirq(unsigned int irq); |
1da177e4 | 192 | extern void disable_irq(unsigned int irq); |
31d9d9b6 | 193 | extern void disable_percpu_irq(unsigned int irq); |
1da177e4 | 194 | extern void enable_irq(unsigned int irq); |
1e7c5fd2 | 195 | extern void enable_percpu_irq(unsigned int irq, unsigned int type); |
a92444c6 | 196 | extern void irq_wake_thread(unsigned int irq, void *dev_id); |
ba9a2331 | 197 | |
0a0c5168 RW |
198 | /* The following three functions are for the core kernel use only. */ |
199 | extern void suspend_device_irqs(void); | |
200 | extern void resume_device_irqs(void); | |
0a0c5168 | 201 | |
f0ba3d05 EP |
202 | /** |
203 | * struct irq_affinity_notify - context for notification of IRQ affinity changes | |
204 | * @irq: Interrupt to which notification applies | |
205 | * @kref: Reference count, for internal use | |
206 | * @work: Work item, for internal use | |
207 | * @notify: Function to be called on change. This will be | |
208 | * called in process context. | |
209 | * @release: Function to be called on release. This will be | |
210 | * called in process context. Once registered, the | |
211 | * structure must only be freed when this function is | |
212 | * called or later. | |
213 | */ | |
214 | struct irq_affinity_notify { | |
215 | unsigned int irq; | |
216 | struct kref kref; | |
217 | struct work_struct work; | |
218 | void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); | |
219 | void (*release)(struct kref *ref); | |
220 | }; | |
221 | ||
0244ad00 | 222 | #if defined(CONFIG_SMP) |
d7b90689 | 223 | |
d036e67b | 224 | extern cpumask_var_t irq_default_affinity; |
18404756 | 225 | |
01f8fa4f TG |
226 | /* Internal implementation. Use the helpers below */ |
227 | extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask, | |
228 | bool force); | |
229 | ||
230 | /** | |
231 | * irq_set_affinity - Set the irq affinity of a given irq | |
232 | * @irq: Interrupt to set affinity | |
def5f127 | 233 | * @cpumask: cpumask |
01f8fa4f TG |
234 | * |
235 | * Fails if cpumask does not contain an online CPU | |
236 | */ | |
237 | static inline int | |
238 | irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) | |
239 | { | |
240 | return __irq_set_affinity(irq, cpumask, false); | |
241 | } | |
242 | ||
243 | /** | |
244 | * irq_force_affinity - Force the irq affinity of a given irq | |
245 | * @irq: Interrupt to set affinity | |
def5f127 | 246 | * @cpumask: cpumask |
01f8fa4f TG |
247 | * |
248 | * Same as irq_set_affinity, but without checking the mask against | |
249 | * online cpus. | |
250 | * | |
251 | * Solely for low level cpu hotplug code, where we need to make per | |
252 | * cpu interrupts affine before the cpu becomes online. | |
253 | */ | |
254 | static inline int | |
255 | irq_force_affinity(unsigned int irq, const struct cpumask *cpumask) | |
256 | { | |
257 | return __irq_set_affinity(irq, cpumask, true); | |
258 | } | |
259 | ||
d7b90689 | 260 | extern int irq_can_set_affinity(unsigned int irq); |
18404756 | 261 | extern int irq_select_affinity(unsigned int irq); |
d7b90689 | 262 | |
e7a297b0 | 263 | extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); |
cd7eab44 | 264 | |
cd7eab44 BH |
265 | extern int |
266 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); | |
267 | ||
d7b90689 RK |
268 | #else /* CONFIG_SMP */ |
269 | ||
0de26520 | 270 | static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) |
d7b90689 RK |
271 | { |
272 | return -EINVAL; | |
273 | } | |
274 | ||
4c88d7f9 AB |
275 | static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask) |
276 | { | |
277 | return 0; | |
278 | } | |
279 | ||
d7b90689 RK |
280 | static inline int irq_can_set_affinity(unsigned int irq) |
281 | { | |
282 | return 0; | |
283 | } | |
284 | ||
18404756 MK |
285 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
286 | ||
e7a297b0 | 287 | static inline int irq_set_affinity_hint(unsigned int irq, |
cd7eab44 | 288 | const struct cpumask *m) |
e7a297b0 PWJ |
289 | { |
290 | return -EINVAL; | |
291 | } | |
f0ba3d05 EP |
292 | |
293 | static inline int | |
294 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) | |
295 | { | |
296 | return 0; | |
297 | } | |
0244ad00 | 298 | #endif /* CONFIG_SMP */ |
d7b90689 | 299 | |
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 | ||
1b7047ed MZ |
364 | /* |
365 | * irq_get_irqchip_state/irq_set_irqchip_state specific flags | |
366 | */ | |
367 | enum irqchip_irq_state { | |
368 | IRQCHIP_STATE_PENDING, /* Is interrupt pending? */ | |
369 | IRQCHIP_STATE_ACTIVE, /* Is interrupt in progress? */ | |
370 | IRQCHIP_STATE_MASKED, /* Is interrupt masked? */ | |
371 | IRQCHIP_STATE_LINE_LEVEL, /* Is IRQ line high? */ | |
372 | }; | |
373 | ||
374 | extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which, | |
375 | bool *state); | |
376 | extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, | |
377 | bool state); | |
8d32a307 TG |
378 | |
379 | #ifdef CONFIG_IRQ_FORCED_THREADING | |
380 | extern bool force_irqthreads; | |
381 | #else | |
382 | #define force_irqthreads (0) | |
383 | #endif | |
384 | ||
3f74478b AK |
385 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
386 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
387 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
388 | #endif | |
389 | ||
2d3fbbb3 BH |
390 | /* Some architectures might implement lazy enabling/disabling of |
391 | * interrupts. In some cases, such as stop_machine, we might want | |
392 | * to ensure that after a local_irq_disable(), interrupts have | |
393 | * really been disabled in hardware. Such architectures need to | |
394 | * implement the following hook. | |
395 | */ | |
396 | #ifndef hard_irq_disable | |
397 | #define hard_irq_disable() do { } while(0) | |
398 | #endif | |
399 | ||
1da177e4 LT |
400 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
401 | frequency threaded job scheduling. For almost all the purposes | |
402 | tasklets are more than enough. F.e. all serial device BHs et | |
403 | al. should be converted to tasklets, not to softirqs. | |
404 | */ | |
405 | ||
406 | enum | |
407 | { | |
408 | HI_SOFTIRQ=0, | |
409 | TIMER_SOFTIRQ, | |
410 | NET_TX_SOFTIRQ, | |
411 | NET_RX_SOFTIRQ, | |
ff856bad | 412 | BLOCK_SOFTIRQ, |
5e605b64 | 413 | BLOCK_IOPOLL_SOFTIRQ, |
c9819f45 CL |
414 | TASKLET_SOFTIRQ, |
415 | SCHED_SOFTIRQ, | |
c6eb3f70 TG |
416 | HRTIMER_SOFTIRQ, /* Unused, but kept as tools rely on the |
417 | numbering. Sigh! */ | |
09223371 | 418 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ |
978b0116 AD |
419 | |
420 | NR_SOFTIRQS | |
1da177e4 LT |
421 | }; |
422 | ||
803b0eba PM |
423 | #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ)) |
424 | ||
5d592b44 JB |
425 | /* map softirq index to softirq name. update 'softirq_to_name' in |
426 | * kernel/softirq.c when adding a new softirq. | |
427 | */ | |
ce85b4f2 | 428 | extern const char * const softirq_to_name[NR_SOFTIRQS]; |
5d592b44 | 429 | |
1da177e4 LT |
430 | /* softirq mask and active fields moved to irq_cpustat_t in |
431 | * asm/hardirq.h to get better cache usage. KAO | |
432 | */ | |
433 | ||
434 | struct softirq_action | |
435 | { | |
436 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
437 | }; |
438 | ||
439 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 440 | asmlinkage void __do_softirq(void); |
7d65f4a6 FW |
441 | |
442 | #ifdef __ARCH_HAS_DO_SOFTIRQ | |
443 | void do_softirq_own_stack(void); | |
444 | #else | |
445 | static inline void do_softirq_own_stack(void) | |
446 | { | |
447 | __do_softirq(); | |
448 | } | |
449 | #endif | |
450 | ||
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 | |
4dd53d89 VP |
458 | DECLARE_PER_CPU(struct task_struct *, ksoftirqd); |
459 | ||
460 | static inline struct task_struct *this_cpu_ksoftirqd(void) | |
461 | { | |
462 | return this_cpu_read(ksoftirqd); | |
463 | } | |
464 | ||
1da177e4 LT |
465 | /* Tasklets --- multithreaded analogue of BHs. |
466 | ||
467 | Main feature differing them of generic softirqs: tasklet | |
468 | is running only on one CPU simultaneously. | |
469 | ||
470 | Main feature differing them of BHs: different tasklets | |
471 | may be run simultaneously on different CPUs. | |
472 | ||
473 | Properties: | |
474 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
475 | to be executed on some cpu at least once after this. | |
25985edc | 476 | * If the tasklet is already scheduled, but its execution is still not |
1da177e4 LT |
477 | started, it will be executed only once. |
478 | * If this tasklet is already running on another CPU (or schedule is called | |
479 | from tasklet itself), it is rescheduled for later. | |
480 | * Tasklet is strictly serialized wrt itself, but not | |
481 | wrt another tasklets. If client needs some intertask synchronization, | |
482 | he makes it with spinlocks. | |
483 | */ | |
484 | ||
485 | struct tasklet_struct | |
486 | { | |
487 | struct tasklet_struct *next; | |
488 | unsigned long state; | |
489 | atomic_t count; | |
490 | void (*func)(unsigned long); | |
491 | unsigned long data; | |
492 | }; | |
493 | ||
494 | #define DECLARE_TASKLET(name, func, data) \ | |
495 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
496 | ||
497 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
498 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
499 | ||
500 | ||
501 | enum | |
502 | { | |
503 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
504 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
505 | }; | |
506 | ||
507 | #ifdef CONFIG_SMP | |
508 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
509 | { | |
510 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
511 | } | |
512 | ||
513 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
514 | { | |
4e857c58 | 515 | smp_mb__before_atomic(); |
1da177e4 LT |
516 | clear_bit(TASKLET_STATE_RUN, &(t)->state); |
517 | } | |
518 | ||
519 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
520 | { | |
521 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
522 | } | |
523 | #else | |
524 | #define tasklet_trylock(t) 1 | |
525 | #define tasklet_unlock_wait(t) do { } while (0) | |
526 | #define tasklet_unlock(t) do { } while (0) | |
527 | #endif | |
528 | ||
b3c97528 | 529 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
530 | |
531 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
532 | { | |
533 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
534 | __tasklet_schedule(t); | |
535 | } | |
536 | ||
b3c97528 | 537 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
538 | |
539 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
540 | { | |
541 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
542 | __tasklet_hi_schedule(t); | |
543 | } | |
544 | ||
7c692cba VN |
545 | extern void __tasklet_hi_schedule_first(struct tasklet_struct *t); |
546 | ||
547 | /* | |
548 | * This version avoids touching any other tasklets. Needed for kmemcheck | |
549 | * in order not to take any page faults while enqueueing this tasklet; | |
550 | * consider VERY carefully whether you really need this or | |
551 | * tasklet_hi_schedule()... | |
552 | */ | |
553 | static inline void tasklet_hi_schedule_first(struct tasklet_struct *t) | |
554 | { | |
555 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
556 | __tasklet_hi_schedule_first(t); | |
557 | } | |
558 | ||
1da177e4 LT |
559 | |
560 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
561 | { | |
562 | atomic_inc(&t->count); | |
4e857c58 | 563 | smp_mb__after_atomic(); |
1da177e4 LT |
564 | } |
565 | ||
566 | static inline void tasklet_disable(struct tasklet_struct *t) | |
567 | { | |
568 | tasklet_disable_nosync(t); | |
569 | tasklet_unlock_wait(t); | |
570 | smp_mb(); | |
571 | } | |
572 | ||
573 | static inline void tasklet_enable(struct tasklet_struct *t) | |
574 | { | |
4e857c58 | 575 | smp_mb__before_atomic(); |
1da177e4 LT |
576 | atomic_dec(&t->count); |
577 | } | |
578 | ||
1da177e4 LT |
579 | extern void tasklet_kill(struct tasklet_struct *t); |
580 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
581 | extern void tasklet_init(struct tasklet_struct *t, | |
582 | void (*func)(unsigned long), unsigned long data); | |
583 | ||
9ba5f005 PZ |
584 | struct tasklet_hrtimer { |
585 | struct hrtimer timer; | |
586 | struct tasklet_struct tasklet; | |
587 | enum hrtimer_restart (*function)(struct hrtimer *); | |
588 | }; | |
589 | ||
590 | extern void | |
591 | tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, | |
592 | enum hrtimer_restart (*function)(struct hrtimer *), | |
593 | clockid_t which_clock, enum hrtimer_mode mode); | |
594 | ||
595 | static inline | |
61699e13 TG |
596 | void tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, |
597 | const enum hrtimer_mode mode) | |
9ba5f005 | 598 | { |
61699e13 | 599 | hrtimer_start(&ttimer->timer, time, mode); |
9ba5f005 PZ |
600 | } |
601 | ||
602 | static inline | |
603 | void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) | |
604 | { | |
605 | hrtimer_cancel(&ttimer->timer); | |
606 | tasklet_kill(&ttimer->tasklet); | |
607 | } | |
608 | ||
1da177e4 LT |
609 | /* |
610 | * Autoprobing for irqs: | |
611 | * | |
612 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
613 | * for accurate IRQ probing during kernel initialization. They are | |
614 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
615 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
616 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
617 | * | |
618 | * For reasonably foolproof probing, use them as follows: | |
619 | * | |
620 | * 1. clear and/or mask the device's internal interrupt. | |
621 | * 2. sti(); | |
622 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
623 | * 4. enable the device and cause it to trigger an interrupt. | |
624 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
625 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
626 | * 7. service the device to clear its pending interrupt. | |
627 | * 8. loop again if paranoia is required. | |
628 | * | |
629 | * probe_irq_on() returns a mask of allocated irq's. | |
630 | * | |
631 | * probe_irq_off() takes the mask as a parameter, | |
632 | * and returns the irq number which occurred, | |
633 | * or zero if none occurred, or a negative irq number | |
634 | * if more than one irq occurred. | |
635 | */ | |
636 | ||
0244ad00 | 637 | #if !defined(CONFIG_GENERIC_IRQ_PROBE) |
1da177e4 LT |
638 | static inline unsigned long probe_irq_on(void) |
639 | { | |
640 | return 0; | |
641 | } | |
642 | static inline int probe_irq_off(unsigned long val) | |
643 | { | |
644 | return 0; | |
645 | } | |
646 | static inline unsigned int probe_irq_mask(unsigned long val) | |
647 | { | |
648 | return 0; | |
649 | } | |
650 | #else | |
651 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
652 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
653 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
654 | #endif | |
655 | ||
6168a702 AM |
656 | #ifdef CONFIG_PROC_FS |
657 | /* Initialize /proc/irq/ */ | |
658 | extern void init_irq_proc(void); | |
659 | #else | |
660 | static inline void init_irq_proc(void) | |
661 | { | |
662 | } | |
663 | #endif | |
664 | ||
d43c36dc | 665 | struct seq_file; |
f74596d0 | 666 | int show_interrupts(struct seq_file *p, void *v); |
c78b9b65 | 667 | int arch_show_interrupts(struct seq_file *p, int prec); |
f74596d0 | 668 | |
43a25632 | 669 | extern int early_irq_init(void); |
4a046d17 | 670 | extern int arch_probe_nr_irqs(void); |
43a25632 | 671 | extern int arch_early_irq_init(void); |
43a25632 | 672 | |
1da177e4 | 673 | #endif |