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> |
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 | ||
85c0f909 YL |
18 | extern int nr_irqs; |
19 | ||
c7fb03a4 YL |
20 | #ifndef CONFIG_GENERIC_HARDIRQS |
21 | #define for_each_irq_desc(irq, desc) \ | |
22 | for (irq = 0; irq < nr_irqs; irq++) | |
23 | #endif | |
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 | * | |
45 | * IRQF_DISABLED - keep irqs disabled when calling the action handler | |
46 | * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator | |
47 | * IRQF_SHARED - allow sharing the irq among several devices | |
48 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur | |
49 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt | |
950f4427 TG |
50 | * IRQF_PERCPU - Interrupt is per cpu |
51 | * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing | |
d85a60d8 BW |
52 | * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is |
53 | * registered first in an shared interrupt is considered for | |
54 | * performance reasons) | |
6e213616 TG |
55 | */ |
56 | #define IRQF_DISABLED 0x00000020 | |
57 | #define IRQF_SAMPLE_RANDOM 0x00000040 | |
58 | #define IRQF_SHARED 0x00000080 | |
59 | #define IRQF_PROBE_SHARED 0x00000100 | |
60 | #define IRQF_TIMER 0x00000200 | |
284c6680 | 61 | #define IRQF_PERCPU 0x00000400 |
950f4427 | 62 | #define IRQF_NOBALANCING 0x00000800 |
d85a60d8 | 63 | #define IRQF_IRQPOLL 0x00001000 |
6e213616 | 64 | |
7d12e780 | 65 | typedef irqreturn_t (*irq_handler_t)(int, void *); |
da482792 | 66 | |
1da177e4 | 67 | struct irqaction { |
da482792 | 68 | irq_handler_t handler; |
1da177e4 LT |
69 | unsigned long flags; |
70 | cpumask_t mask; | |
71 | const char *name; | |
72 | void *dev_id; | |
73 | struct irqaction *next; | |
74 | int irq; | |
75 | struct proc_dir_entry *dir; | |
76 | }; | |
77 | ||
7d12e780 | 78 | extern irqreturn_t no_action(int cpl, void *dev_id); |
616883df | 79 | extern int __must_check request_irq(unsigned int, irq_handler_t handler, |
1da177e4 LT |
80 | unsigned long, const char *, void *); |
81 | extern void free_irq(unsigned int, void *); | |
82 | ||
0af3678f AV |
83 | struct device; |
84 | ||
616883df | 85 | extern int __must_check devm_request_irq(struct device *dev, unsigned int irq, |
9ac7849e TH |
86 | irq_handler_t handler, unsigned long irqflags, |
87 | const char *devname, void *dev_id); | |
88 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); | |
89 | ||
d7e9629d IM |
90 | /* |
91 | * On lockdep we dont want to enable hardirqs in hardirq | |
92 | * context. Use local_irq_enable_in_hardirq() to annotate | |
93 | * kernel code that has to do this nevertheless (pretty much | |
94 | * the only valid case is for old/broken hardware that is | |
95 | * insanely slow). | |
96 | * | |
97 | * NOTE: in theory this might break fragile code that relies | |
98 | * on hardirq delivery - in practice we dont seem to have such | |
99 | * places left. So the only effect should be slightly increased | |
100 | * irqs-off latencies. | |
101 | */ | |
102 | #ifdef CONFIG_LOCKDEP | |
103 | # define local_irq_enable_in_hardirq() do { } while (0) | |
104 | #else | |
105 | # define local_irq_enable_in_hardirq() local_irq_enable() | |
106 | #endif | |
1da177e4 | 107 | |
1da177e4 LT |
108 | extern void disable_irq_nosync(unsigned int irq); |
109 | extern void disable_irq(unsigned int irq); | |
110 | extern void enable_irq(unsigned int irq); | |
ba9a2331 | 111 | |
d7b90689 RK |
112 | #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS) |
113 | ||
18404756 MK |
114 | extern cpumask_t irq_default_affinity; |
115 | ||
d7b90689 RK |
116 | extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask); |
117 | extern int irq_can_set_affinity(unsigned int irq); | |
18404756 | 118 | extern int irq_select_affinity(unsigned int irq); |
d7b90689 RK |
119 | |
120 | #else /* CONFIG_SMP */ | |
121 | ||
122 | static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask) | |
123 | { | |
124 | return -EINVAL; | |
125 | } | |
126 | ||
127 | static inline int irq_can_set_affinity(unsigned int irq) | |
128 | { | |
129 | return 0; | |
130 | } | |
131 | ||
18404756 MK |
132 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
133 | ||
d7b90689 RK |
134 | #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */ |
135 | ||
e9ed7e72 | 136 | #ifdef CONFIG_GENERIC_HARDIRQS |
c01d403b IM |
137 | /* |
138 | * Special lockdep variants of irq disabling/enabling. | |
139 | * These should be used for locking constructs that | |
140 | * know that a particular irq context which is disabled, | |
141 | * and which is the only irq-context user of a lock, | |
142 | * that it's safe to take the lock in the irq-disabled | |
143 | * section without disabling hardirqs. | |
144 | * | |
145 | * On !CONFIG_LOCKDEP they are equivalent to the normal | |
146 | * irq disable/enable methods. | |
147 | */ | |
148 | static inline void disable_irq_nosync_lockdep(unsigned int irq) | |
149 | { | |
150 | disable_irq_nosync(irq); | |
151 | #ifdef CONFIG_LOCKDEP | |
152 | local_irq_disable(); | |
153 | #endif | |
154 | } | |
155 | ||
e8106b94 AV |
156 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
157 | { | |
158 | disable_irq_nosync(irq); | |
159 | #ifdef CONFIG_LOCKDEP | |
160 | local_irq_save(*flags); | |
161 | #endif | |
162 | } | |
163 | ||
c01d403b IM |
164 | static inline void disable_irq_lockdep(unsigned int irq) |
165 | { | |
166 | disable_irq(irq); | |
167 | #ifdef CONFIG_LOCKDEP | |
168 | local_irq_disable(); | |
169 | #endif | |
170 | } | |
171 | ||
172 | static inline void enable_irq_lockdep(unsigned int irq) | |
173 | { | |
174 | #ifdef CONFIG_LOCKDEP | |
175 | local_irq_enable(); | |
176 | #endif | |
177 | enable_irq(irq); | |
178 | } | |
179 | ||
e8106b94 AV |
180 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
181 | { | |
182 | #ifdef CONFIG_LOCKDEP | |
183 | local_irq_restore(*flags); | |
184 | #endif | |
185 | enable_irq(irq); | |
186 | } | |
187 | ||
ba9a2331 TG |
188 | /* IRQ wakeup (PM) control: */ |
189 | extern int set_irq_wake(unsigned int irq, unsigned int on); | |
190 | ||
191 | static inline int enable_irq_wake(unsigned int irq) | |
192 | { | |
193 | return set_irq_wake(irq, 1); | |
194 | } | |
195 | ||
196 | static inline int disable_irq_wake(unsigned int irq) | |
197 | { | |
198 | return set_irq_wake(irq, 0); | |
199 | } | |
200 | ||
c01d403b IM |
201 | #else /* !CONFIG_GENERIC_HARDIRQS */ |
202 | /* | |
203 | * NOTE: non-genirq architectures, if they want to support the lock | |
204 | * validator need to define the methods below in their asm/irq.h | |
205 | * files, under an #ifdef CONFIG_LOCKDEP section. | |
206 | */ | |
b3e2fd9c | 207 | #ifndef CONFIG_LOCKDEP |
c01d403b | 208 | # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq) |
b3e2fd9c RZ |
209 | # define disable_irq_nosync_lockdep_irqsave(irq, flags) \ |
210 | disable_irq_nosync(irq) | |
c01d403b IM |
211 | # define disable_irq_lockdep(irq) disable_irq(irq) |
212 | # define enable_irq_lockdep(irq) enable_irq(irq) | |
b3e2fd9c RZ |
213 | # define enable_irq_lockdep_irqrestore(irq, flags) \ |
214 | enable_irq(irq) | |
c01d403b IM |
215 | # endif |
216 | ||
aa5346a2 GL |
217 | static inline int enable_irq_wake(unsigned int irq) |
218 | { | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static inline int disable_irq_wake(unsigned int irq) | |
223 | { | |
224 | return 0; | |
225 | } | |
c01d403b | 226 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
1da177e4 | 227 | |
3f74478b AK |
228 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
229 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
230 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
231 | #endif | |
232 | ||
2d3fbbb3 BH |
233 | /* Some architectures might implement lazy enabling/disabling of |
234 | * interrupts. In some cases, such as stop_machine, we might want | |
235 | * to ensure that after a local_irq_disable(), interrupts have | |
236 | * really been disabled in hardware. Such architectures need to | |
237 | * implement the following hook. | |
238 | */ | |
239 | #ifndef hard_irq_disable | |
240 | #define hard_irq_disable() do { } while(0) | |
241 | #endif | |
242 | ||
1da177e4 LT |
243 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
244 | frequency threaded job scheduling. For almost all the purposes | |
245 | tasklets are more than enough. F.e. all serial device BHs et | |
246 | al. should be converted to tasklets, not to softirqs. | |
247 | */ | |
248 | ||
249 | enum | |
250 | { | |
251 | HI_SOFTIRQ=0, | |
252 | TIMER_SOFTIRQ, | |
253 | NET_TX_SOFTIRQ, | |
254 | NET_RX_SOFTIRQ, | |
ff856bad | 255 | BLOCK_SOFTIRQ, |
c9819f45 CL |
256 | TASKLET_SOFTIRQ, |
257 | SCHED_SOFTIRQ, | |
54cdfdb4 TG |
258 | #ifdef CONFIG_HIGH_RES_TIMERS |
259 | HRTIMER_SOFTIRQ, | |
260 | #endif | |
c2d727aa | 261 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ |
1da177e4 LT |
262 | }; |
263 | ||
264 | /* softirq mask and active fields moved to irq_cpustat_t in | |
265 | * asm/hardirq.h to get better cache usage. KAO | |
266 | */ | |
267 | ||
268 | struct softirq_action | |
269 | { | |
270 | void (*action)(struct softirq_action *); | |
1da177e4 LT |
271 | }; |
272 | ||
273 | asmlinkage void do_softirq(void); | |
eb0f1c44 | 274 | asmlinkage void __do_softirq(void); |
962cf36c | 275 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
1da177e4 | 276 | extern void softirq_init(void); |
3f74478b | 277 | #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) |
b3c97528 HH |
278 | extern void raise_softirq_irqoff(unsigned int nr); |
279 | extern void raise_softirq(unsigned int nr); | |
1da177e4 LT |
280 | |
281 | ||
282 | /* Tasklets --- multithreaded analogue of BHs. | |
283 | ||
284 | Main feature differing them of generic softirqs: tasklet | |
285 | is running only on one CPU simultaneously. | |
286 | ||
287 | Main feature differing them of BHs: different tasklets | |
288 | may be run simultaneously on different CPUs. | |
289 | ||
290 | Properties: | |
291 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
292 | to be executed on some cpu at least once after this. | |
293 | * If the tasklet is already scheduled, but its excecution is still not | |
294 | started, it will be executed only once. | |
295 | * If this tasklet is already running on another CPU (or schedule is called | |
296 | from tasklet itself), it is rescheduled for later. | |
297 | * Tasklet is strictly serialized wrt itself, but not | |
298 | wrt another tasklets. If client needs some intertask synchronization, | |
299 | he makes it with spinlocks. | |
300 | */ | |
301 | ||
302 | struct tasklet_struct | |
303 | { | |
304 | struct tasklet_struct *next; | |
305 | unsigned long state; | |
306 | atomic_t count; | |
307 | void (*func)(unsigned long); | |
308 | unsigned long data; | |
309 | }; | |
310 | ||
311 | #define DECLARE_TASKLET(name, func, data) \ | |
312 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
313 | ||
314 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
315 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
316 | ||
317 | ||
318 | enum | |
319 | { | |
320 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
321 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
322 | }; | |
323 | ||
324 | #ifdef CONFIG_SMP | |
325 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
326 | { | |
327 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
328 | } | |
329 | ||
330 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
331 | { | |
332 | smp_mb__before_clear_bit(); | |
333 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
334 | } | |
335 | ||
336 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
337 | { | |
338 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
339 | } | |
340 | #else | |
341 | #define tasklet_trylock(t) 1 | |
342 | #define tasklet_unlock_wait(t) do { } while (0) | |
343 | #define tasklet_unlock(t) do { } while (0) | |
344 | #endif | |
345 | ||
b3c97528 | 346 | extern void __tasklet_schedule(struct tasklet_struct *t); |
1da177e4 LT |
347 | |
348 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
349 | { | |
350 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
351 | __tasklet_schedule(t); | |
352 | } | |
353 | ||
b3c97528 | 354 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
1da177e4 LT |
355 | |
356 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
357 | { | |
358 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
359 | __tasklet_hi_schedule(t); | |
360 | } | |
361 | ||
362 | ||
363 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
364 | { | |
365 | atomic_inc(&t->count); | |
366 | smp_mb__after_atomic_inc(); | |
367 | } | |
368 | ||
369 | static inline void tasklet_disable(struct tasklet_struct *t) | |
370 | { | |
371 | tasklet_disable_nosync(t); | |
372 | tasklet_unlock_wait(t); | |
373 | smp_mb(); | |
374 | } | |
375 | ||
376 | static inline void tasklet_enable(struct tasklet_struct *t) | |
377 | { | |
378 | smp_mb__before_atomic_dec(); | |
379 | atomic_dec(&t->count); | |
380 | } | |
381 | ||
382 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
383 | { | |
384 | smp_mb__before_atomic_dec(); | |
385 | atomic_dec(&t->count); | |
386 | } | |
387 | ||
388 | extern void tasklet_kill(struct tasklet_struct *t); | |
389 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
390 | extern void tasklet_init(struct tasklet_struct *t, | |
391 | void (*func)(unsigned long), unsigned long data); | |
392 | ||
393 | /* | |
394 | * Autoprobing for irqs: | |
395 | * | |
396 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
397 | * for accurate IRQ probing during kernel initialization. They are | |
398 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
399 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
400 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
401 | * | |
402 | * For reasonably foolproof probing, use them as follows: | |
403 | * | |
404 | * 1. clear and/or mask the device's internal interrupt. | |
405 | * 2. sti(); | |
406 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
407 | * 4. enable the device and cause it to trigger an interrupt. | |
408 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
409 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
410 | * 7. service the device to clear its pending interrupt. | |
411 | * 8. loop again if paranoia is required. | |
412 | * | |
413 | * probe_irq_on() returns a mask of allocated irq's. | |
414 | * | |
415 | * probe_irq_off() takes the mask as a parameter, | |
416 | * and returns the irq number which occurred, | |
417 | * or zero if none occurred, or a negative irq number | |
418 | * if more than one irq occurred. | |
419 | */ | |
420 | ||
421 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
422 | static inline unsigned long probe_irq_on(void) | |
423 | { | |
424 | return 0; | |
425 | } | |
426 | static inline int probe_irq_off(unsigned long val) | |
427 | { | |
428 | return 0; | |
429 | } | |
430 | static inline unsigned int probe_irq_mask(unsigned long val) | |
431 | { | |
432 | return 0; | |
433 | } | |
434 | #else | |
435 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
436 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
437 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
438 | #endif | |
439 | ||
6168a702 AM |
440 | #ifdef CONFIG_PROC_FS |
441 | /* Initialize /proc/irq/ */ | |
442 | extern void init_irq_proc(void); | |
443 | #else | |
444 | static inline void init_irq_proc(void) | |
445 | { | |
446 | } | |
447 | #endif | |
448 | ||
f74596d0 AB |
449 | int show_interrupts(struct seq_file *p, void *v); |
450 | ||
1da177e4 | 451 | #endif |