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> |
f037360f | 13 | #include <linux/sched.h> |
de30a2b3 | 14 | #include <linux/irqflags.h> |
54514a70 DM |
15 | #include <linux/smp.h> |
16 | #include <linux/percpu.h> | |
0ebb26e7 IM |
17 | #include <linux/irqnr.h> |
18 | ||
1da177e4 LT |
19 | #include <asm/atomic.h> |
20 | #include <asm/ptrace.h> | |
21 | #include <asm/system.h> | |
22 | ||
6e213616 TG |
23 | /* |
24 | * These correspond to the IORESOURCE_IRQ_* defines in | |
25 | * linux/ioport.h to select the interrupt line behaviour. When | |
26 | * requesting an interrupt without specifying a IRQF_TRIGGER, the | |
27 | * setting should be assumed to be "as already configured", which | |
28 | * may be as per machine or firmware initialisation. | |
29 | */ | |
30 | #define IRQF_TRIGGER_NONE 0x00000000 | |
31 | #define IRQF_TRIGGER_RISING 0x00000001 | |
32 | #define IRQF_TRIGGER_FALLING 0x00000002 | |
33 | #define IRQF_TRIGGER_HIGH 0x00000004 | |
34 | #define IRQF_TRIGGER_LOW 0x00000008 | |
35 | #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \ | |
36 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING) | |
37 | #define IRQF_TRIGGER_PROBE 0x00000010 | |
38 | ||
39 | /* | |
40 | * These flags used only by the kernel as part of the | |
41 | * irq handling routines. | |
42 | * | |
43 | * IRQF_DISABLED - keep irqs disabled when calling the action handler | |
44 | * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator | |
45 | * IRQF_SHARED - allow sharing the irq among several devices | |
46 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur | |
47 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt | |
950f4427 TG |
48 | * IRQF_PERCPU - Interrupt is per cpu |
49 | * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing | |
d85a60d8 BW |
50 | * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is |
51 | * registered first in an shared interrupt is considered for | |
52 | * performance reasons) | |
6e213616 TG |
53 | */ |
54 | #define IRQF_DISABLED 0x00000020 | |
55 | #define IRQF_SAMPLE_RANDOM 0x00000040 | |
56 | #define IRQF_SHARED 0x00000080 | |
57 | #define IRQF_PROBE_SHARED 0x00000100 | |
58 | #define IRQF_TIMER 0x00000200 | |
284c6680 | 59 | #define IRQF_PERCPU 0x00000400 |
950f4427 | 60 | #define IRQF_NOBALANCING 0x00000800 |
d85a60d8 | 61 | #define IRQF_IRQPOLL 0x00001000 |
6e213616 | 62 | |
7d12e780 | 63 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 64 | |
1da177e4 | 65 | struct irqaction { |
da482792 | 66 | irq_handler_t handler; |
1da177e4 LT |
67 | unsigned long flags; |
68 | cpumask_t mask; | |
69 | const char *name; | |
70 | void *dev_id; | |
71 | struct irqaction *next; | |
72 | int irq; | |
73 | struct proc_dir_entry *dir; | |
74 | }; | |
75 | ||
7d12e780 | 76 | extern irqreturn_t no_action(int cpl, void *dev_id); |
616883df | 77 | extern int __must_check request_irq(unsigned int, irq_handler_t handler, |
1da177e4 LT |
78 | unsigned long, const char *, void *); |
79 | extern void free_irq(unsigned int, void *); | |
80 | ||
0af3678f AV |
81 | struct device; |
82 | ||
616883df | 83 | extern int __must_check devm_request_irq(struct device *dev, unsigned int irq, |
9ac7849e TH |
84 | irq_handler_t handler, unsigned long irqflags, |
85 | const char *devname, void *dev_id); | |
86 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); | |
87 | ||
d7e9629d IM |
88 | /* |
89 | * On lockdep we dont want to enable hardirqs in hardirq | |
90 | * context. Use local_irq_enable_in_hardirq() to annotate | |
91 | * kernel code that has to do this nevertheless (pretty much | |
92 | * the only valid case is for old/broken hardware that is | |
93 | * insanely slow). | |
94 | * | |
95 | * NOTE: in theory this might break fragile code that relies | |
96 | * on hardirq delivery - in practice we dont seem to have such | |
97 | * places left. So the only effect should be slightly increased | |
98 | * irqs-off latencies. | |
99 | */ | |
100 | #ifdef CONFIG_LOCKDEP | |
101 | # define local_irq_enable_in_hardirq() do { } while (0) | |
102 | #else | |
103 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
104 | #endif | |
1da177e4 | 105 | |
1da177e4 LT |
106 | extern void disable_irq_nosync(unsigned int irq); |
107 | extern void disable_irq(unsigned int irq); | |
108 | extern void enable_irq(unsigned int irq); | |
ba9a2331 | 109 | |
d7b90689 RK |
110 | #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS) |
111 | ||
18404756 MK |
112 | extern cpumask_t irq_default_affinity; |
113 | ||
d7b90689 RK |
114 | extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask); |
115 | extern int irq_can_set_affinity(unsigned int irq); | |
18404756 | 116 | extern int irq_select_affinity(unsigned int irq); |
d7b90689 RK |
117 | |
118 | #else /* CONFIG_SMP */ | |
119 | ||
120 | static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask) | |
121 | { | |
122 | return -EINVAL; | |
123 | } | |
124 | ||
125 | static inline int irq_can_set_affinity(unsigned int irq) | |
126 | { | |
127 | return 0; | |
128 | } | |
129 | ||
18404756 MK |
130 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
131 | ||
d7b90689 RK |
132 | #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */ |
133 | ||
e9ed7e72 | 134 | #ifdef CONFIG_GENERIC_HARDIRQS |
c01d403b IM |
135 | /* |
136 | * Special lockdep variants of irq disabling/enabling. | |
137 | * These should be used for locking constructs that | |
138 | * know that a particular irq context which is disabled, | |
139 | * and which is the only irq-context user of a lock, | |
140 | * that it's safe to take the lock in the irq-disabled | |
141 | * section without disabling hardirqs. | |
142 | * | |
143 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
144 | * irq disable/enable methods. | |
145 | */ | |
146 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
147 | { | |
148 | disable_irq_nosync(irq); | |
149 | #ifdef CONFIG_LOCKDEP | |
150 | local_irq_disable(); | |
151 | #endif | |
152 | } | |
153 | ||
e8106b94 AV |
154 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
155 | { | |
156 | disable_irq_nosync(irq); | |
157 | #ifdef CONFIG_LOCKDEP | |
158 | local_irq_save(*flags); | |
159 | #endif | |
160 | } | |
161 | ||
c01d403b IM |
162 | static inline void disable_irq_lockdep(unsigned int irq) |
163 | { | |
164 | disable_irq(irq); | |
165 | #ifdef CONFIG_LOCKDEP | |
166 | local_irq_disable(); | |
167 | #endif | |
168 | } | |
169 | ||
170 | static inline void enable_irq_lockdep(unsigned int irq) | |
171 | { | |
172 | #ifdef CONFIG_LOCKDEP | |
173 | local_irq_enable(); | |
174 | #endif | |
175 | enable_irq(irq); | |
176 | } | |
177 | ||
e8106b94 AV |
178 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
179 | { | |
180 | #ifdef CONFIG_LOCKDEP | |
181 | local_irq_restore(*flags); | |
182 | #endif | |
183 | enable_irq(irq); | |
184 | } | |
185 | ||
ba9a2331 TG |
186 | /* IRQ wakeup (PM) control: */ |
187 | extern int set_irq_wake(unsigned int irq, unsigned int on); | |
188 | ||
189 | static inline int enable_irq_wake(unsigned int irq) | |
190 | { | |
191 | return set_irq_wake(irq, 1); | |
192 | } | |
193 | ||
194 | static inline int disable_irq_wake(unsigned int irq) | |
195 | { | |
196 | return set_irq_wake(irq, 0); | |
197 | } | |
198 | ||
c01d403b IM |
199 | #else /* !CONFIG_GENERIC_HARDIRQS */ |
200 | /* | |
201 | * NOTE: non-genirq architectures, if they want to support the lock | |
202 | * validator need to define the methods below in their asm/irq.h | |
203 | * files, under an #ifdef CONFIG_LOCKDEP section. | |
204 | */ | |
b3e2fd9c | 205 | #ifndef CONFIG_LOCKDEP |
c01d403b | 206 | # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq) |
b3e2fd9c RZ |
207 | # define disable_irq_nosync_lockdep_irqsave(irq, flags) \ |
208 | disable_irq_nosync(irq) | |
c01d403b IM |
209 | # define disable_irq_lockdep(irq) disable_irq(irq) |
210 | # define enable_irq_lockdep(irq) enable_irq(irq) | |
b3e2fd9c RZ |
211 | # define enable_irq_lockdep_irqrestore(irq, flags) \ |
212 | enable_irq(irq) | |
c01d403b IM |
213 | # endif |
214 | ||
aa5346a2 GL |
215 | static inline int enable_irq_wake(unsigned int irq) |
216 | { | |
217 | return 0; | |
218 | } | |
219 | ||
220 | static inline int disable_irq_wake(unsigned int irq) | |
221 | { | |
222 | return 0; | |
223 | } | |
c01d403b | 224 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 225 | |
3f74478b AK |
226 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
227 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
228 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
229 | #endif | |
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, | |
c2d727aa | 256 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ |
978b0116 AD |
257 | |
258 | NR_SOFTIRQS | |
1da177e4 LT |
259 | }; |
260 | ||
261 | /* softirq mask and active fields moved to irq_cpustat_t in | |
262 | * asm/hardirq.h to get better cache usage. KAO | |
263 | */ | |
264 | ||
265 | struct softirq_action | |
266 | { | |
267 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
268 | }; |
269 | ||
270 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 271 | asmlinkage void __do_softirq(void); |
962cf36c | 272 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
1da177e4 | 273 | extern void softirq_init(void); |
3f74478b | 274 | #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) |
b3c97528 HH |
275 | extern void raise_softirq_irqoff(unsigned int nr); |
276 | extern void raise_softirq(unsigned int nr); | |
1da177e4 | 277 | |
54514a70 DM |
278 | /* This is the worklist that queues up per-cpu softirq work. |
279 | * | |
280 | * send_remote_sendirq() adds work to these lists, and | |
281 | * the softirq handler itself dequeues from them. The queues | |
282 | * are protected by disabling local cpu interrupts and they must | |
283 | * only be accessed by the local cpu that they are for. | |
284 | */ | |
285 | DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list); | |
286 | ||
287 | /* Try to send a softirq to a remote cpu. If this cannot be done, the | |
288 | * work will be queued to the local cpu. | |
289 | */ | |
290 | extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq); | |
291 | ||
292 | /* Like send_remote_softirq(), but the caller must disable local cpu interrupts | |
293 | * and compute the current cpu, passed in as 'this_cpu'. | |
294 | */ | |
295 | extern void __send_remote_softirq(struct call_single_data *cp, int cpu, | |
296 | int this_cpu, int softirq); | |
1da177e4 LT |
297 | |
298 | /* Tasklets --- multithreaded analogue of BHs. | |
299 | ||
300 | Main feature differing them of generic softirqs: tasklet | |
301 | is running only on one CPU simultaneously. | |
302 | ||
303 | Main feature differing them of BHs: different tasklets | |
304 | may be run simultaneously on different CPUs. | |
305 | ||
306 | Properties: | |
307 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
308 | to be executed on some cpu at least once after this. | |
309 | * If the tasklet is already scheduled, but its excecution is still not | |
310 | started, it will be executed only once. | |
311 | * If this tasklet is already running on another CPU (or schedule is called | |
312 | from tasklet itself), it is rescheduled for later. | |
313 | * Tasklet is strictly serialized wrt itself, but not | |
314 | wrt another tasklets. If client needs some intertask synchronization, | |
315 | he makes it with spinlocks. | |
316 | */ | |
317 | ||
318 | struct tasklet_struct | |
319 | { | |
320 | struct tasklet_struct *next; | |
321 | unsigned long state; | |
322 | atomic_t count; | |
323 | void (*func)(unsigned long); | |
324 | unsigned long data; | |
325 | }; | |
326 | ||
327 | #define DECLARE_TASKLET(name, func, data) \ | |
328 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
329 | ||
330 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
331 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
332 | ||
333 | ||
334 | enum | |
335 | { | |
336 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
337 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
338 | }; | |
339 | ||
340 | #ifdef CONFIG_SMP | |
341 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
342 | { | |
343 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
344 | } | |
345 | ||
346 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
347 | { | |
348 | smp_mb__before_clear_bit(); | |
349 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
350 | } | |
351 | ||
352 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
353 | { | |
354 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
355 | } | |
356 | #else | |
357 | #define tasklet_trylock(t) 1 | |
358 | #define tasklet_unlock_wait(t) do { } while (0) | |
359 | #define tasklet_unlock(t) do { } while (0) | |
360 | #endif | |
361 | ||
b3c97528 | 362 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
363 | |
364 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
365 | { | |
366 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
367 | __tasklet_schedule(t); | |
368 | } | |
369 | ||
b3c97528 | 370 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
371 | |
372 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
373 | { | |
374 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
375 | __tasklet_hi_schedule(t); | |
376 | } | |
377 | ||
378 | ||
379 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
380 | { | |
381 | atomic_inc(&t->count); | |
382 | smp_mb__after_atomic_inc(); | |
383 | } | |
384 | ||
385 | static inline void tasklet_disable(struct tasklet_struct *t) | |
386 | { | |
387 | tasklet_disable_nosync(t); | |
388 | tasklet_unlock_wait(t); | |
389 | smp_mb(); | |
390 | } | |
391 | ||
392 | static inline void tasklet_enable(struct tasklet_struct *t) | |
393 | { | |
394 | smp_mb__before_atomic_dec(); | |
395 | atomic_dec(&t->count); | |
396 | } | |
397 | ||
398 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
399 | { | |
400 | smp_mb__before_atomic_dec(); | |
401 | atomic_dec(&t->count); | |
402 | } | |
403 | ||
404 | extern void tasklet_kill(struct tasklet_struct *t); | |
405 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
406 | extern void tasklet_init(struct tasklet_struct *t, | |
407 | void (*func)(unsigned long), unsigned long data); | |
408 | ||
409 | /* | |
410 | * Autoprobing for irqs: | |
411 | * | |
412 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
413 | * for accurate IRQ probing during kernel initialization. They are | |
414 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
415 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
416 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
417 | * | |
418 | * For reasonably foolproof probing, use them as follows: | |
419 | * | |
420 | * 1. clear and/or mask the device's internal interrupt. | |
421 | * 2. sti(); | |
422 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
423 | * 4. enable the device and cause it to trigger an interrupt. | |
424 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
425 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
426 | * 7. service the device to clear its pending interrupt. | |
427 | * 8. loop again if paranoia is required. | |
428 | * | |
429 | * probe_irq_on() returns a mask of allocated irq's. | |
430 | * | |
431 | * probe_irq_off() takes the mask as a parameter, | |
432 | * and returns the irq number which occurred, | |
433 | * or zero if none occurred, or a negative irq number | |
434 | * if more than one irq occurred. | |
435 | */ | |
436 | ||
437 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
438 | static inline unsigned long probe_irq_on(void) | |
439 | { | |
440 | return 0; | |
441 | } | |
442 | static inline int probe_irq_off(unsigned long val) | |
443 | { | |
444 | return 0; | |
445 | } | |
446 | static inline unsigned int probe_irq_mask(unsigned long val) | |
447 | { | |
448 | return 0; | |
449 | } | |
450 | #else | |
451 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
452 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
453 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
454 | #endif | |
455 | ||
6168a702 AM |
456 | #ifdef CONFIG_PROC_FS |
457 | /* Initialize /proc/irq/ */ | |
458 | extern void init_irq_proc(void); | |
459 | #else | |
460 | static inline void init_irq_proc(void) | |
461 | { | |
462 | } | |
463 | #endif | |
464 | ||
f74596d0 AB |
465 | int show_interrupts(struct seq_file *p, void *v); |
466 | ||
1da177e4 | 467 | #endif |