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); |
a92444c6 | 191 | extern void irq_wake_thread(unsigned int irq, void *dev_id); |
ba9a2331 | 192 | |
0a0c5168 RW |
193 | /* The following three functions are for the core kernel use only. */ |
194 | extern void suspend_device_irqs(void); | |
195 | extern void resume_device_irqs(void); | |
0a0c5168 | 196 | |
f0ba3d05 EP |
197 | /** |
198 | * struct irq_affinity_notify - context for notification of IRQ affinity changes | |
199 | * @irq: Interrupt to which notification applies | |
200 | * @kref: Reference count, for internal use | |
201 | * @work: Work item, for internal use | |
202 | * @notify: Function to be called on change. This will be | |
203 | * called in process context. | |
204 | * @release: Function to be called on release. This will be | |
205 | * called in process context. Once registered, the | |
206 | * structure must only be freed when this function is | |
207 | * called or later. | |
208 | */ | |
209 | struct irq_affinity_notify { | |
210 | unsigned int irq; | |
211 | struct kref kref; | |
212 | struct work_struct work; | |
213 | void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); | |
214 | void (*release)(struct kref *ref); | |
215 | }; | |
216 | ||
0244ad00 | 217 | #if defined(CONFIG_SMP) |
d7b90689 | 218 | |
d036e67b | 219 | extern cpumask_var_t irq_default_affinity; |
18404756 | 220 | |
01f8fa4f TG |
221 | /* Internal implementation. Use the helpers below */ |
222 | extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask, | |
223 | bool force); | |
224 | ||
225 | /** | |
226 | * irq_set_affinity - Set the irq affinity of a given irq | |
227 | * @irq: Interrupt to set affinity | |
def5f127 | 228 | * @cpumask: cpumask |
01f8fa4f TG |
229 | * |
230 | * Fails if cpumask does not contain an online CPU | |
231 | */ | |
232 | static inline int | |
233 | irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) | |
234 | { | |
235 | return __irq_set_affinity(irq, cpumask, false); | |
236 | } | |
237 | ||
238 | /** | |
239 | * irq_force_affinity - Force the irq affinity of a given irq | |
240 | * @irq: Interrupt to set affinity | |
def5f127 | 241 | * @cpumask: cpumask |
01f8fa4f TG |
242 | * |
243 | * Same as irq_set_affinity, but without checking the mask against | |
244 | * online cpus. | |
245 | * | |
246 | * Solely for low level cpu hotplug code, where we need to make per | |
247 | * cpu interrupts affine before the cpu becomes online. | |
248 | */ | |
249 | static inline int | |
250 | irq_force_affinity(unsigned int irq, const struct cpumask *cpumask) | |
251 | { | |
252 | return __irq_set_affinity(irq, cpumask, true); | |
253 | } | |
254 | ||
d7b90689 | 255 | extern int irq_can_set_affinity(unsigned int irq); |
18404756 | 256 | extern int irq_select_affinity(unsigned int irq); |
d7b90689 | 257 | |
e7a297b0 | 258 | extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); |
cd7eab44 | 259 | |
cd7eab44 BH |
260 | extern int |
261 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); | |
262 | ||
d7b90689 RK |
263 | #else /* CONFIG_SMP */ |
264 | ||
0de26520 | 265 | static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) |
d7b90689 RK |
266 | { |
267 | return -EINVAL; | |
268 | } | |
269 | ||
4c88d7f9 AB |
270 | static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask) |
271 | { | |
272 | return 0; | |
273 | } | |
274 | ||
d7b90689 RK |
275 | static inline int irq_can_set_affinity(unsigned int irq) |
276 | { | |
277 | return 0; | |
278 | } | |
279 | ||
18404756 MK |
280 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
281 | ||
e7a297b0 | 282 | static inline int irq_set_affinity_hint(unsigned int irq, |
cd7eab44 | 283 | const struct cpumask *m) |
e7a297b0 PWJ |
284 | { |
285 | return -EINVAL; | |
286 | } | |
f0ba3d05 EP |
287 | |
288 | static inline int | |
289 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) | |
290 | { | |
291 | return 0; | |
292 | } | |
0244ad00 | 293 | #endif /* CONFIG_SMP */ |
d7b90689 | 294 | |
c01d403b IM |
295 | /* |
296 | * Special lockdep variants of irq disabling/enabling. | |
297 | * These should be used for locking constructs that | |
298 | * know that a particular irq context which is disabled, | |
299 | * and which is the only irq-context user of a lock, | |
300 | * that it's safe to take the lock in the irq-disabled | |
301 | * section without disabling hardirqs. | |
302 | * | |
303 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
304 | * irq disable/enable methods. | |
305 | */ | |
306 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
307 | { | |
308 | disable_irq_nosync(irq); | |
309 | #ifdef CONFIG_LOCKDEP | |
310 | local_irq_disable(); | |
311 | #endif | |
312 | } | |
313 | ||
e8106b94 AV |
314 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
315 | { | |
316 | disable_irq_nosync(irq); | |
317 | #ifdef CONFIG_LOCKDEP | |
318 | local_irq_save(*flags); | |
319 | #endif | |
320 | } | |
321 | ||
c01d403b IM |
322 | static inline void disable_irq_lockdep(unsigned int irq) |
323 | { | |
324 | disable_irq(irq); | |
325 | #ifdef CONFIG_LOCKDEP | |
326 | local_irq_disable(); | |
327 | #endif | |
328 | } | |
329 | ||
330 | static inline void enable_irq_lockdep(unsigned int irq) | |
331 | { | |
332 | #ifdef CONFIG_LOCKDEP | |
333 | local_irq_enable(); | |
334 | #endif | |
335 | enable_irq(irq); | |
336 | } | |
337 | ||
e8106b94 AV |
338 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
339 | { | |
340 | #ifdef CONFIG_LOCKDEP | |
341 | local_irq_restore(*flags); | |
342 | #endif | |
343 | enable_irq(irq); | |
344 | } | |
345 | ||
ba9a2331 | 346 | /* IRQ wakeup (PM) control: */ |
a0cd9ca2 TG |
347 | extern int irq_set_irq_wake(unsigned int irq, unsigned int on); |
348 | ||
ba9a2331 TG |
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 | ||
8d32a307 TG |
359 | |
360 | #ifdef CONFIG_IRQ_FORCED_THREADING | |
361 | extern bool force_irqthreads; | |
362 | #else | |
363 | #define force_irqthreads (0) | |
364 | #endif | |
365 | ||
3f74478b AK |
366 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
367 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
368 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
369 | #endif | |
370 | ||
2d3fbbb3 BH |
371 | /* Some architectures might implement lazy enabling/disabling of |
372 | * interrupts. In some cases, such as stop_machine, we might want | |
373 | * to ensure that after a local_irq_disable(), interrupts have | |
374 | * really been disabled in hardware. Such architectures need to | |
375 | * implement the following hook. | |
376 | */ | |
377 | #ifndef hard_irq_disable | |
378 | #define hard_irq_disable() do { } while(0) | |
379 | #endif | |
380 | ||
1da177e4 LT |
381 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
382 | frequency threaded job scheduling. For almost all the purposes | |
383 | tasklets are more than enough. F.e. all serial device BHs et | |
384 | al. should be converted to tasklets, not to softirqs. | |
385 | */ | |
386 | ||
387 | enum | |
388 | { | |
389 | HI_SOFTIRQ=0, | |
390 | TIMER_SOFTIRQ, | |
391 | NET_TX_SOFTIRQ, | |
392 | NET_RX_SOFTIRQ, | |
ff856bad | 393 | BLOCK_SOFTIRQ, |
5e605b64 | 394 | BLOCK_IOPOLL_SOFTIRQ, |
c9819f45 CL |
395 | TASKLET_SOFTIRQ, |
396 | SCHED_SOFTIRQ, | |
a6037b61 | 397 | HRTIMER_SOFTIRQ, |
09223371 | 398 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ |
978b0116 AD |
399 | |
400 | NR_SOFTIRQS | |
1da177e4 LT |
401 | }; |
402 | ||
803b0eba PM |
403 | #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ)) |
404 | ||
5d592b44 JB |
405 | /* map softirq index to softirq name. update 'softirq_to_name' in |
406 | * kernel/softirq.c when adding a new softirq. | |
407 | */ | |
ce85b4f2 | 408 | extern const char * const softirq_to_name[NR_SOFTIRQS]; |
5d592b44 | 409 | |
1da177e4 LT |
410 | /* softirq mask and active fields moved to irq_cpustat_t in |
411 | * asm/hardirq.h to get better cache usage. KAO | |
412 | */ | |
413 | ||
414 | struct softirq_action | |
415 | { | |
416 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
417 | }; |
418 | ||
419 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 420 | asmlinkage void __do_softirq(void); |
7d65f4a6 FW |
421 | |
422 | #ifdef __ARCH_HAS_DO_SOFTIRQ | |
423 | void do_softirq_own_stack(void); | |
424 | #else | |
425 | static inline void do_softirq_own_stack(void) | |
426 | { | |
427 | __do_softirq(); | |
428 | } | |
429 | #endif | |
430 | ||
962cf36c | 431 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
1da177e4 | 432 | extern void softirq_init(void); |
f069686e | 433 | extern void __raise_softirq_irqoff(unsigned int nr); |
2bf2160d | 434 | |
b3c97528 HH |
435 | extern void raise_softirq_irqoff(unsigned int nr); |
436 | extern void raise_softirq(unsigned int nr); | |
1da177e4 | 437 | |
4dd53d89 VP |
438 | DECLARE_PER_CPU(struct task_struct *, ksoftirqd); |
439 | ||
440 | static inline struct task_struct *this_cpu_ksoftirqd(void) | |
441 | { | |
442 | return this_cpu_read(ksoftirqd); | |
443 | } | |
444 | ||
1da177e4 LT |
445 | /* Tasklets --- multithreaded analogue of BHs. |
446 | ||
447 | Main feature differing them of generic softirqs: tasklet | |
448 | is running only on one CPU simultaneously. | |
449 | ||
450 | Main feature differing them of BHs: different tasklets | |
451 | may be run simultaneously on different CPUs. | |
452 | ||
453 | Properties: | |
454 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
455 | to be executed on some cpu at least once after this. | |
25985edc | 456 | * If the tasklet is already scheduled, but its execution is still not |
1da177e4 LT |
457 | started, it will be executed only once. |
458 | * If this tasklet is already running on another CPU (or schedule is called | |
459 | from tasklet itself), it is rescheduled for later. | |
460 | * Tasklet is strictly serialized wrt itself, but not | |
461 | wrt another tasklets. If client needs some intertask synchronization, | |
462 | he makes it with spinlocks. | |
463 | */ | |
464 | ||
465 | struct tasklet_struct | |
466 | { | |
467 | struct tasklet_struct *next; | |
468 | unsigned long state; | |
469 | atomic_t count; | |
470 | void (*func)(unsigned long); | |
471 | unsigned long data; | |
472 | }; | |
473 | ||
474 | #define DECLARE_TASKLET(name, func, data) \ | |
475 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
476 | ||
477 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
478 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
479 | ||
480 | ||
481 | enum | |
482 | { | |
483 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
484 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
485 | }; | |
486 | ||
487 | #ifdef CONFIG_SMP | |
488 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
489 | { | |
490 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
491 | } | |
492 | ||
493 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
494 | { | |
4e857c58 | 495 | smp_mb__before_atomic(); |
1da177e4 LT |
496 | clear_bit(TASKLET_STATE_RUN, &(t)->state); |
497 | } | |
498 | ||
499 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
500 | { | |
501 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
502 | } | |
503 | #else | |
504 | #define tasklet_trylock(t) 1 | |
505 | #define tasklet_unlock_wait(t) do { } while (0) | |
506 | #define tasklet_unlock(t) do { } while (0) | |
507 | #endif | |
508 | ||
b3c97528 | 509 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
510 | |
511 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
512 | { | |
513 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
514 | __tasklet_schedule(t); | |
515 | } | |
516 | ||
b3c97528 | 517 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
518 | |
519 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
520 | { | |
521 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
522 | __tasklet_hi_schedule(t); | |
523 | } | |
524 | ||
7c692cba VN |
525 | extern void __tasklet_hi_schedule_first(struct tasklet_struct *t); |
526 | ||
527 | /* | |
528 | * This version avoids touching any other tasklets. Needed for kmemcheck | |
529 | * in order not to take any page faults while enqueueing this tasklet; | |
530 | * consider VERY carefully whether you really need this or | |
531 | * tasklet_hi_schedule()... | |
532 | */ | |
533 | static inline void tasklet_hi_schedule_first(struct tasklet_struct *t) | |
534 | { | |
535 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
536 | __tasklet_hi_schedule_first(t); | |
537 | } | |
538 | ||
1da177e4 LT |
539 | |
540 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
541 | { | |
542 | atomic_inc(&t->count); | |
4e857c58 | 543 | smp_mb__after_atomic(); |
1da177e4 LT |
544 | } |
545 | ||
546 | static inline void tasklet_disable(struct tasklet_struct *t) | |
547 | { | |
548 | tasklet_disable_nosync(t); | |
549 | tasklet_unlock_wait(t); | |
550 | smp_mb(); | |
551 | } | |
552 | ||
553 | static inline void tasklet_enable(struct tasklet_struct *t) | |
554 | { | |
4e857c58 | 555 | smp_mb__before_atomic(); |
1da177e4 LT |
556 | atomic_dec(&t->count); |
557 | } | |
558 | ||
559 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
560 | { | |
4e857c58 | 561 | smp_mb__before_atomic(); |
1da177e4 LT |
562 | atomic_dec(&t->count); |
563 | } | |
564 | ||
565 | extern void tasklet_kill(struct tasklet_struct *t); | |
566 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
567 | extern void tasklet_init(struct tasklet_struct *t, | |
568 | void (*func)(unsigned long), unsigned long data); | |
569 | ||
9ba5f005 PZ |
570 | struct tasklet_hrtimer { |
571 | struct hrtimer timer; | |
572 | struct tasklet_struct tasklet; | |
573 | enum hrtimer_restart (*function)(struct hrtimer *); | |
574 | }; | |
575 | ||
576 | extern void | |
577 | tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, | |
578 | enum hrtimer_restart (*function)(struct hrtimer *), | |
579 | clockid_t which_clock, enum hrtimer_mode mode); | |
580 | ||
581 | static inline | |
582 | int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, | |
583 | const enum hrtimer_mode mode) | |
584 | { | |
585 | return hrtimer_start(&ttimer->timer, time, mode); | |
586 | } | |
587 | ||
588 | static inline | |
589 | void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) | |
590 | { | |
591 | hrtimer_cancel(&ttimer->timer); | |
592 | tasklet_kill(&ttimer->tasklet); | |
593 | } | |
594 | ||
1da177e4 LT |
595 | /* |
596 | * Autoprobing for irqs: | |
597 | * | |
598 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
599 | * for accurate IRQ probing during kernel initialization. They are | |
600 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
601 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
602 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
603 | * | |
604 | * For reasonably foolproof probing, use them as follows: | |
605 | * | |
606 | * 1. clear and/or mask the device's internal interrupt. | |
607 | * 2. sti(); | |
608 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
609 | * 4. enable the device and cause it to trigger an interrupt. | |
610 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
611 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
612 | * 7. service the device to clear its pending interrupt. | |
613 | * 8. loop again if paranoia is required. | |
614 | * | |
615 | * probe_irq_on() returns a mask of allocated irq's. | |
616 | * | |
617 | * probe_irq_off() takes the mask as a parameter, | |
618 | * and returns the irq number which occurred, | |
619 | * or zero if none occurred, or a negative irq number | |
620 | * if more than one irq occurred. | |
621 | */ | |
622 | ||
0244ad00 | 623 | #if !defined(CONFIG_GENERIC_IRQ_PROBE) |
1da177e4 LT |
624 | static inline unsigned long probe_irq_on(void) |
625 | { | |
626 | return 0; | |
627 | } | |
628 | static inline int probe_irq_off(unsigned long val) | |
629 | { | |
630 | return 0; | |
631 | } | |
632 | static inline unsigned int probe_irq_mask(unsigned long val) | |
633 | { | |
634 | return 0; | |
635 | } | |
636 | #else | |
637 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
638 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
639 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
640 | #endif | |
641 | ||
6168a702 AM |
642 | #ifdef CONFIG_PROC_FS |
643 | /* Initialize /proc/irq/ */ | |
644 | extern void init_irq_proc(void); | |
645 | #else | |
646 | static inline void init_irq_proc(void) | |
647 | { | |
648 | } | |
649 | #endif | |
650 | ||
d43c36dc | 651 | struct seq_file; |
f74596d0 | 652 | int show_interrupts(struct seq_file *p, void *v); |
c78b9b65 | 653 | int arch_show_interrupts(struct seq_file *p, int prec); |
f74596d0 | 654 | |
43a25632 | 655 | extern int early_irq_init(void); |
4a046d17 | 656 | extern int arch_probe_nr_irqs(void); |
43a25632 | 657 | extern int arch_early_irq_init(void); |
43a25632 | 658 | |
1da177e4 | 659 | #endif |