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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> |
1da177e4 | 11 | #include <linux/hardirq.h> |
f037360f | 12 | #include <linux/sched.h> |
de30a2b3 | 13 | #include <linux/irqflags.h> |
1da177e4 LT |
14 | #include <asm/atomic.h> |
15 | #include <asm/ptrace.h> | |
16 | #include <asm/system.h> | |
17 | ||
6e213616 TG |
18 | /* |
19 | * These correspond to the IORESOURCE_IRQ_* defines in | |
20 | * linux/ioport.h to select the interrupt line behaviour. When | |
21 | * requesting an interrupt without specifying a IRQF_TRIGGER, the | |
22 | * setting should be assumed to be "as already configured", which | |
23 | * may be as per machine or firmware initialisation. | |
24 | */ | |
25 | #define IRQF_TRIGGER_NONE 0x00000000 | |
26 | #define IRQF_TRIGGER_RISING 0x00000001 | |
27 | #define IRQF_TRIGGER_FALLING 0x00000002 | |
28 | #define IRQF_TRIGGER_HIGH 0x00000004 | |
29 | #define IRQF_TRIGGER_LOW 0x00000008 | |
30 | #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \ | |
31 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING) | |
32 | #define IRQF_TRIGGER_PROBE 0x00000010 | |
33 | ||
34 | /* | |
35 | * These flags used only by the kernel as part of the | |
36 | * irq handling routines. | |
37 | * | |
38 | * IRQF_DISABLED - keep irqs disabled when calling the action handler | |
39 | * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator | |
40 | * IRQF_SHARED - allow sharing the irq among several devices | |
41 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur | |
42 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt | |
950f4427 TG |
43 | * IRQF_PERCPU - Interrupt is per cpu |
44 | * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing | |
d85a60d8 BW |
45 | * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is |
46 | * registered first in an shared interrupt is considered for | |
47 | * performance reasons) | |
6e213616 TG |
48 | */ |
49 | #define IRQF_DISABLED 0x00000020 | |
50 | #define IRQF_SAMPLE_RANDOM 0x00000040 | |
51 | #define IRQF_SHARED 0x00000080 | |
52 | #define IRQF_PROBE_SHARED 0x00000100 | |
53 | #define IRQF_TIMER 0x00000200 | |
284c6680 | 54 | #define IRQF_PERCPU 0x00000400 |
950f4427 | 55 | #define IRQF_NOBALANCING 0x00000800 |
d85a60d8 | 56 | #define IRQF_IRQPOLL 0x00001000 |
6e213616 | 57 | |
7d12e780 | 58 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 59 | |
1da177e4 | 60 | struct irqaction { |
da482792 | 61 | irq_handler_t handler; |
1da177e4 LT |
62 | unsigned long flags; |
63 | cpumask_t mask; | |
64 | const char *name; | |
65 | void *dev_id; | |
66 | struct irqaction *next; | |
67 | int irq; | |
68 | struct proc_dir_entry *dir; | |
69 | }; | |
70 | ||
7d12e780 | 71 | extern irqreturn_t no_action(int cpl, void *dev_id); |
616883df | 72 | extern int __must_check request_irq(unsigned int, irq_handler_t handler, |
1da177e4 LT |
73 | unsigned long, const char *, void *); |
74 | extern void free_irq(unsigned int, void *); | |
75 | ||
0af3678f AV |
76 | struct device; |
77 | ||
616883df | 78 | extern int __must_check devm_request_irq(struct device *dev, unsigned int irq, |
9ac7849e TH |
79 | irq_handler_t handler, unsigned long irqflags, |
80 | const char *devname, void *dev_id); | |
81 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); | |
82 | ||
d7e9629d IM |
83 | /* |
84 | * On lockdep we dont want to enable hardirqs in hardirq | |
85 | * context. Use local_irq_enable_in_hardirq() to annotate | |
86 | * kernel code that has to do this nevertheless (pretty much | |
87 | * the only valid case is for old/broken hardware that is | |
88 | * insanely slow). | |
89 | * | |
90 | * NOTE: in theory this might break fragile code that relies | |
91 | * on hardirq delivery - in practice we dont seem to have such | |
92 | * places left. So the only effect should be slightly increased | |
93 | * irqs-off latencies. | |
94 | */ | |
95 | #ifdef CONFIG_LOCKDEP | |
96 | # define local_irq_enable_in_hardirq() do { } while (0) | |
97 | #else | |
98 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
99 | #endif | |
1da177e4 | 100 | |
1da177e4 LT |
101 | extern void disable_irq_nosync(unsigned int irq); |
102 | extern void disable_irq(unsigned int irq); | |
103 | extern void enable_irq(unsigned int irq); | |
ba9a2331 | 104 | |
e9ed7e72 | 105 | #ifdef CONFIG_GENERIC_HARDIRQS |
c01d403b IM |
106 | /* |
107 | * Special lockdep variants of irq disabling/enabling. | |
108 | * These should be used for locking constructs that | |
109 | * know that a particular irq context which is disabled, | |
110 | * and which is the only irq-context user of a lock, | |
111 | * that it's safe to take the lock in the irq-disabled | |
112 | * section without disabling hardirqs. | |
113 | * | |
114 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
115 | * irq disable/enable methods. | |
116 | */ | |
117 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
118 | { | |
119 | disable_irq_nosync(irq); | |
120 | #ifdef CONFIG_LOCKDEP | |
121 | local_irq_disable(); | |
122 | #endif | |
123 | } | |
124 | ||
e8106b94 AV |
125 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
126 | { | |
127 | disable_irq_nosync(irq); | |
128 | #ifdef CONFIG_LOCKDEP | |
129 | local_irq_save(*flags); | |
130 | #endif | |
131 | } | |
132 | ||
c01d403b IM |
133 | static inline void disable_irq_lockdep(unsigned int irq) |
134 | { | |
135 | disable_irq(irq); | |
136 | #ifdef CONFIG_LOCKDEP | |
137 | local_irq_disable(); | |
138 | #endif | |
139 | } | |
140 | ||
141 | static inline void enable_irq_lockdep(unsigned int irq) | |
142 | { | |
143 | #ifdef CONFIG_LOCKDEP | |
144 | local_irq_enable(); | |
145 | #endif | |
146 | enable_irq(irq); | |
147 | } | |
148 | ||
e8106b94 AV |
149 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
150 | { | |
151 | #ifdef CONFIG_LOCKDEP | |
152 | local_irq_restore(*flags); | |
153 | #endif | |
154 | enable_irq(irq); | |
155 | } | |
156 | ||
ba9a2331 TG |
157 | /* IRQ wakeup (PM) control: */ |
158 | extern int set_irq_wake(unsigned int irq, unsigned int on); | |
159 | ||
160 | static inline int enable_irq_wake(unsigned int irq) | |
161 | { | |
162 | return set_irq_wake(irq, 1); | |
163 | } | |
164 | ||
165 | static inline int disable_irq_wake(unsigned int irq) | |
166 | { | |
167 | return set_irq_wake(irq, 0); | |
168 | } | |
169 | ||
c01d403b IM |
170 | #else /* !CONFIG_GENERIC_HARDIRQS */ |
171 | /* | |
172 | * NOTE: non-genirq architectures, if they want to support the lock | |
173 | * validator need to define the methods below in their asm/irq.h | |
174 | * files, under an #ifdef CONFIG_LOCKDEP section. | |
175 | */ | |
b3e2fd9c | 176 | #ifndef CONFIG_LOCKDEP |
c01d403b | 177 | # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq) |
b3e2fd9c RZ |
178 | # define disable_irq_nosync_lockdep_irqsave(irq, flags) \ |
179 | disable_irq_nosync(irq) | |
c01d403b IM |
180 | # define disable_irq_lockdep(irq) disable_irq(irq) |
181 | # define enable_irq_lockdep(irq) enable_irq(irq) | |
b3e2fd9c RZ |
182 | # define enable_irq_lockdep_irqrestore(irq, flags) \ |
183 | enable_irq(irq) | |
c01d403b IM |
184 | # endif |
185 | ||
aa5346a2 GL |
186 | static inline int enable_irq_wake(unsigned int irq) |
187 | { | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static inline int disable_irq_wake(unsigned int irq) | |
192 | { | |
193 | return 0; | |
194 | } | |
c01d403b | 195 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 196 | |
3f74478b AK |
197 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
198 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
199 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
200 | #endif | |
201 | ||
1da177e4 LT |
202 | /* |
203 | * Temporary defines for UP kernels, until all code gets fixed. | |
204 | */ | |
205 | #ifndef CONFIG_SMP | |
206 | static inline void __deprecated cli(void) | |
207 | { | |
208 | local_irq_disable(); | |
209 | } | |
210 | static inline void __deprecated sti(void) | |
211 | { | |
212 | local_irq_enable(); | |
213 | } | |
214 | static inline void __deprecated save_flags(unsigned long *x) | |
215 | { | |
216 | local_save_flags(*x); | |
217 | } | |
ef9ceab2 | 218 | #define save_flags(x) save_flags(&x) |
1da177e4 LT |
219 | static inline void __deprecated restore_flags(unsigned long x) |
220 | { | |
221 | local_irq_restore(x); | |
222 | } | |
223 | ||
224 | static inline void __deprecated save_and_cli(unsigned long *x) | |
225 | { | |
226 | local_irq_save(*x); | |
227 | } | |
228 | #define save_and_cli(x) save_and_cli(&x) | |
229 | #endif /* CONFIG_SMP */ | |
230 | ||
2d3fbbb3 BH |
231 | /* Some architectures might implement lazy enabling/disabling of |
232 | * interrupts. In some cases, such as stop_machine, we might want | |
233 | * to ensure that after a local_irq_disable(), interrupts have | |
234 | * really been disabled in hardware. Such architectures need to | |
235 | * implement the following hook. | |
236 | */ | |
237 | #ifndef hard_irq_disable | |
238 | #define hard_irq_disable() do { } while(0) | |
239 | #endif | |
240 | ||
1da177e4 LT |
241 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
242 | frequency threaded job scheduling. For almost all the purposes | |
243 | tasklets are more than enough. F.e. all serial device BHs et | |
244 | al. should be converted to tasklets, not to softirqs. | |
245 | */ | |
246 | ||
247 | enum | |
248 | { | |
249 | HI_SOFTIRQ=0, | |
250 | TIMER_SOFTIRQ, | |
251 | NET_TX_SOFTIRQ, | |
252 | NET_RX_SOFTIRQ, | |
ff856bad | 253 | BLOCK_SOFTIRQ, |
c9819f45 CL |
254 | TASKLET_SOFTIRQ, |
255 | SCHED_SOFTIRQ, | |
54cdfdb4 TG |
256 | #ifdef CONFIG_HIGH_RES_TIMERS |
257 | HRTIMER_SOFTIRQ, | |
258 | #endif | |
c2d727aa | 259 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ |
1da177e4 LT |
260 | }; |
261 | ||
262 | /* softirq mask and active fields moved to irq_cpustat_t in | |
263 | * asm/hardirq.h to get better cache usage. KAO | |
264 | */ | |
265 | ||
266 | struct softirq_action | |
267 | { | |
268 | void (*action)(struct softirq_action *); | |
269 | void *data; | |
270 | }; | |
271 | ||
272 | asmlinkage void do_softirq(void); | |
273 | extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data); | |
274 | extern void softirq_init(void); | |
3f74478b | 275 | #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) |
1da177e4 LT |
276 | extern void FASTCALL(raise_softirq_irqoff(unsigned int nr)); |
277 | extern void FASTCALL(raise_softirq(unsigned int nr)); | |
278 | ||
279 | ||
280 | /* Tasklets --- multithreaded analogue of BHs. | |
281 | ||
282 | Main feature differing them of generic softirqs: tasklet | |
283 | is running only on one CPU simultaneously. | |
284 | ||
285 | Main feature differing them of BHs: different tasklets | |
286 | may be run simultaneously on different CPUs. | |
287 | ||
288 | Properties: | |
289 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
290 | to be executed on some cpu at least once after this. | |
291 | * If the tasklet is already scheduled, but its excecution is still not | |
292 | started, it will be executed only once. | |
293 | * If this tasklet is already running on another CPU (or schedule is called | |
294 | from tasklet itself), it is rescheduled for later. | |
295 | * Tasklet is strictly serialized wrt itself, but not | |
296 | wrt another tasklets. If client needs some intertask synchronization, | |
297 | he makes it with spinlocks. | |
298 | */ | |
299 | ||
300 | struct tasklet_struct | |
301 | { | |
302 | struct tasklet_struct *next; | |
303 | unsigned long state; | |
304 | atomic_t count; | |
305 | void (*func)(unsigned long); | |
306 | unsigned long data; | |
307 | }; | |
308 | ||
309 | #define DECLARE_TASKLET(name, func, data) \ | |
310 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
311 | ||
312 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
313 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
314 | ||
315 | ||
316 | enum | |
317 | { | |
318 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
319 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
320 | }; | |
321 | ||
322 | #ifdef CONFIG_SMP | |
323 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
324 | { | |
325 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
326 | } | |
327 | ||
328 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
329 | { | |
330 | smp_mb__before_clear_bit(); | |
331 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
332 | } | |
333 | ||
334 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
335 | { | |
336 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
337 | } | |
338 | #else | |
339 | #define tasklet_trylock(t) 1 | |
340 | #define tasklet_unlock_wait(t) do { } while (0) | |
341 | #define tasklet_unlock(t) do { } while (0) | |
342 | #endif | |
343 | ||
344 | extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t)); | |
345 | ||
346 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
347 | { | |
348 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
349 | __tasklet_schedule(t); | |
350 | } | |
351 | ||
352 | extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t)); | |
353 | ||
354 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
355 | { | |
356 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
357 | __tasklet_hi_schedule(t); | |
358 | } | |
359 | ||
360 | ||
361 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
362 | { | |
363 | atomic_inc(&t->count); | |
364 | smp_mb__after_atomic_inc(); | |
365 | } | |
366 | ||
367 | static inline void tasklet_disable(struct tasklet_struct *t) | |
368 | { | |
369 | tasklet_disable_nosync(t); | |
370 | tasklet_unlock_wait(t); | |
371 | smp_mb(); | |
372 | } | |
373 | ||
374 | static inline void tasklet_enable(struct tasklet_struct *t) | |
375 | { | |
376 | smp_mb__before_atomic_dec(); | |
377 | atomic_dec(&t->count); | |
378 | } | |
379 | ||
380 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
381 | { | |
382 | smp_mb__before_atomic_dec(); | |
383 | atomic_dec(&t->count); | |
384 | } | |
385 | ||
386 | extern void tasklet_kill(struct tasklet_struct *t); | |
387 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
388 | extern void tasklet_init(struct tasklet_struct *t, | |
389 | void (*func)(unsigned long), unsigned long data); | |
390 | ||
391 | /* | |
392 | * Autoprobing for irqs: | |
393 | * | |
394 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
395 | * for accurate IRQ probing during kernel initialization. They are | |
396 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
397 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
398 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
399 | * | |
400 | * For reasonably foolproof probing, use them as follows: | |
401 | * | |
402 | * 1. clear and/or mask the device's internal interrupt. | |
403 | * 2. sti(); | |
404 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
405 | * 4. enable the device and cause it to trigger an interrupt. | |
406 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
407 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
408 | * 7. service the device to clear its pending interrupt. | |
409 | * 8. loop again if paranoia is required. | |
410 | * | |
411 | * probe_irq_on() returns a mask of allocated irq's. | |
412 | * | |
413 | * probe_irq_off() takes the mask as a parameter, | |
414 | * and returns the irq number which occurred, | |
415 | * or zero if none occurred, or a negative irq number | |
416 | * if more than one irq occurred. | |
417 | */ | |
418 | ||
419 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
420 | static inline unsigned long probe_irq_on(void) | |
421 | { | |
422 | return 0; | |
423 | } | |
424 | static inline int probe_irq_off(unsigned long val) | |
425 | { | |
426 | return 0; | |
427 | } | |
428 | static inline unsigned int probe_irq_mask(unsigned long val) | |
429 | { | |
430 | return 0; | |
431 | } | |
432 | #else | |
433 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
434 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
435 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
436 | #endif | |
437 | ||
6168a702 AM |
438 | #ifdef CONFIG_PROC_FS |
439 | /* Initialize /proc/irq/ */ | |
440 | extern void init_irq_proc(void); | |
441 | #else | |
442 | static inline void init_irq_proc(void) | |
443 | { | |
444 | } | |
445 | #endif | |
446 | ||
1da177e4 | 447 | #endif |