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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* interrupt.h */
2#ifndef _LINUX_INTERRUPT_H
3#define _LINUX_INTERRUPT_H
4
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/kernel.h>
6#include <linux/linkage.h>
7#include <linux/bitops.h>
8#include <linux/preempt.h>
9#include <linux/cpumask.h>
Jan Beulich908dcec2006-06-23 02:06:00 -070010#include <linux/irqreturn.h>
Thomas Gleixnerdd3a1db2008-10-16 18:20:58 +020011#include <linux/irqnr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/hardirq.h>
Ingo Molnarde30a2b2006-07-03 00:24:42 -070013#include <linux/irqflags.h>
David S. Miller54514a72008-09-23 22:15:57 -070014#include <linux/smp.h>
15#include <linux/percpu.h>
Peter Zijlstra9ba5f002009-07-22 14:18:35 +020016#include <linux/hrtimer.h>
Ingo Molnar0ebb26e2008-12-12 11:26:39 +010017
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <asm/atomic.h>
19#include <asm/ptrace.h>
20#include <asm/system.h>
21
Thomas Gleixner6e213612006-07-01 19:29:03 -070022/*
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 *
42 * IRQF_DISABLED - keep irqs disabled when calling the action handler
43 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
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
Thomas Gleixner950f4422007-02-16 01:27:24 -080047 * IRQF_PERCPU - Interrupt is per cpu
48 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
Bernhard Walled85a60d2007-05-08 00:35:24 -070049 * 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)
Thomas Gleixnerb25c3402009-08-13 12:17:22 +020052 * 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.
Thomas Gleixner6e213612006-07-01 19:29:03 -070055 */
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
Thomas Gleixner284c6682006-07-03 02:20:32 +020061#define IRQF_PERCPU 0x00000400
Thomas Gleixner950f4422007-02-16 01:27:24 -080062#define IRQF_NOBALANCING 0x00000800
Bernhard Walled85a60d2007-05-08 00:35:24 -070063#define IRQF_IRQPOLL 0x00001000
Thomas Gleixnerb25c3402009-08-13 12:17:22 +020064#define IRQF_ONESHOT 0x00002000
Thomas Gleixner6e213612006-07-01 19:29:03 -070065
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010066/*
67 * Bits used by threaded handlers:
68 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
69 * IRQTF_DIED - handler thread died
Thomas Gleixnerf48fe812009-03-24 11:46:22 +010070 * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
Thomas Gleixner591d2fb2009-07-21 11:09:39 +020071 * IRQTF_AFFINITY - irq thread is requested to adjust affinity
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010072 */
73enum {
74 IRQTF_RUNTHREAD,
75 IRQTF_DIED,
Thomas Gleixnerf48fe812009-03-24 11:46:22 +010076 IRQTF_WARNED,
Thomas Gleixner591d2fb2009-07-21 11:09:39 +020077 IRQTF_AFFINITY,
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010078};
79
David Howells7d12e782006-10-05 14:55:46 +010080typedef irqreturn_t (*irq_handler_t)(int, void *);
David Howellsda482792006-10-05 13:06:34 +010081
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010082/**
83 * struct irqaction - per interrupt action descriptor
84 * @handler: interrupt handler function
85 * @flags: flags (see IRQF_* above)
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010086 * @name: name of the device
87 * @dev_id: cookie to identify the device
88 * @next: pointer to the next irqaction for shared interrupts
89 * @irq: interrupt number
90 * @dir: pointer to the proc/irq/NN/name entry
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010091 * @thread_fn: interupt handler function for threaded interrupts
92 * @thread: thread pointer for threaded interrupts
93 * @thread_flags: flags related to @thread
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010094 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070095struct irqaction {
David Howellsda482792006-10-05 13:06:34 +010096 irq_handler_t handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 const char *name;
99 void *dev_id;
100 struct irqaction *next;
101 int irq;
102 struct proc_dir_entry *dir;
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100103 irq_handler_t thread_fn;
104 struct task_struct *thread;
105 unsigned long thread_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106};
107
David Howells7d12e782006-10-05 14:55:46 +0100108extern irqreturn_t no_action(int cpl, void *dev_id);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100109
Thomas Gleixner3a381482009-03-24 20:27:39 +0100110#ifdef CONFIG_GENERIC_HARDIRQS
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100111extern int __must_check
112request_threaded_irq(unsigned int irq, irq_handler_t handler,
113 irq_handler_t thread_fn,
114 unsigned long flags, const char *name, void *dev);
115
116static inline int __must_check
117request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
118 const char *name, void *dev)
119{
120 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
121}
122
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100123extern void exit_irq_thread(void);
124#else
Thomas Gleixner3a381482009-03-24 20:27:39 +0100125
126extern int __must_check
127request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
128 const char *name, void *dev);
129
Thomas Gleixnerde188362009-03-25 17:33:38 +0100130/*
131 * Special function to avoid ifdeffery in kernel/irq/devres.c which
132 * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
133 * m68k). I really love these $@%#!* obvious Makefile references:
134 * ../../../kernel/irq/devres.o
135 */
136static inline int __must_check
137request_threaded_irq(unsigned int irq, irq_handler_t handler,
138 irq_handler_t thread_fn,
139 unsigned long flags, const char *name, void *dev)
140{
141 return request_irq(irq, handler, flags, name, dev);
142}
143
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100144static inline void exit_irq_thread(void) { }
145#endif
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147extern void free_irq(unsigned int, void *);
148
Al Viro0af36782007-07-27 14:24:33 +0100149struct device;
150
Arjan van de Ven935bd5b2009-03-23 18:28:16 +0100151extern int __must_check
152devm_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
157static inline int __must_check
158devm_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
Tejun Heo9ac78492007-01-20 16:00:26 +0900165extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
166
Ingo Molnard7e96292006-07-03 00:24:27 -0700167/*
168 * On lockdep we dont want to enable hardirqs in hardirq
169 * context. Use local_irq_enable_in_hardirq() to annotate
170 * kernel code that has to do this nevertheless (pretty much
171 * the only valid case is for old/broken hardware that is
172 * insanely slow).
173 *
174 * NOTE: in theory this might break fragile code that relies
175 * on hardirq delivery - in practice we dont seem to have such
176 * places left. So the only effect should be slightly increased
177 * irqs-off latencies.
178 */
179#ifdef CONFIG_LOCKDEP
180# define local_irq_enable_in_hardirq() do { } while (0)
181#else
182# define local_irq_enable_in_hardirq() local_irq_enable()
183#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185extern void disable_irq_nosync(unsigned int irq);
186extern void disable_irq(unsigned int irq);
187extern void enable_irq(unsigned int irq);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700188
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100189/* The following three functions are for the core kernel use only. */
Heiko Carstens5818a6e2009-06-11 21:59:21 +0200190#ifdef CONFIG_GENERIC_HARDIRQS
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100191extern void suspend_device_irqs(void);
192extern void resume_device_irqs(void);
193#ifdef CONFIG_PM_SLEEP
194extern int check_wakeup_irqs(void);
195#else
196static inline int check_wakeup_irqs(void) { return 0; }
197#endif
Heiko Carstens5818a6e2009-06-11 21:59:21 +0200198#else
199static inline void suspend_device_irqs(void) { };
200static inline void resume_device_irqs(void) { };
201static inline int check_wakeup_irqs(void) { return 0; }
202#endif
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100203
Russell Kingd7b90682008-04-17 07:46:24 +0200204#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
205
Rusty Russelld036e672009-01-01 10:12:26 +1030206extern cpumask_var_t irq_default_affinity;
Max Krasnyansky18404752008-05-29 11:02:52 -0700207
Rusty Russell0de26522008-12-13 21:20:26 +1030208extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
Russell Kingd7b90682008-04-17 07:46:24 +0200209extern int irq_can_set_affinity(unsigned int irq);
Max Krasnyansky18404752008-05-29 11:02:52 -0700210extern int irq_select_affinity(unsigned int irq);
Russell Kingd7b90682008-04-17 07:46:24 +0200211
212#else /* CONFIG_SMP */
213
Rusty Russell0de26522008-12-13 21:20:26 +1030214static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
Russell Kingd7b90682008-04-17 07:46:24 +0200215{
216 return -EINVAL;
217}
218
219static inline int irq_can_set_affinity(unsigned int irq)
220{
221 return 0;
222}
223
Max Krasnyansky18404752008-05-29 11:02:52 -0700224static inline int irq_select_affinity(unsigned int irq) { return 0; }
225
Russell Kingd7b90682008-04-17 07:46:24 +0200226#endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
227
Al Viroe9ed7e72007-07-21 23:29:12 +0100228#ifdef CONFIG_GENERIC_HARDIRQS
Ingo Molnarc01d4032006-07-03 00:24:27 -0700229/*
230 * Special lockdep variants of irq disabling/enabling.
231 * These should be used for locking constructs that
232 * know that a particular irq context which is disabled,
233 * and which is the only irq-context user of a lock,
234 * that it's safe to take the lock in the irq-disabled
235 * section without disabling hardirqs.
236 *
237 * On !CONFIG_LOCKDEP they are equivalent to the normal
238 * irq disable/enable methods.
239 */
240static inline void disable_irq_nosync_lockdep(unsigned int irq)
241{
242 disable_irq_nosync(irq);
243#ifdef CONFIG_LOCKDEP
244 local_irq_disable();
245#endif
246}
247
Arjan van de Vene8106b92006-09-29 02:01:08 -0700248static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
249{
250 disable_irq_nosync(irq);
251#ifdef CONFIG_LOCKDEP
252 local_irq_save(*flags);
253#endif
254}
255
Ingo Molnarc01d4032006-07-03 00:24:27 -0700256static inline void disable_irq_lockdep(unsigned int irq)
257{
258 disable_irq(irq);
259#ifdef CONFIG_LOCKDEP
260 local_irq_disable();
261#endif
262}
263
264static inline void enable_irq_lockdep(unsigned int irq)
265{
266#ifdef CONFIG_LOCKDEP
267 local_irq_enable();
268#endif
269 enable_irq(irq);
270}
271
Arjan van de Vene8106b92006-09-29 02:01:08 -0700272static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
273{
274#ifdef CONFIG_LOCKDEP
275 local_irq_restore(*flags);
276#endif
277 enable_irq(irq);
278}
279
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700280/* IRQ wakeup (PM) control: */
281extern int set_irq_wake(unsigned int irq, unsigned int on);
282
283static inline int enable_irq_wake(unsigned int irq)
284{
285 return set_irq_wake(irq, 1);
286}
287
288static inline int disable_irq_wake(unsigned int irq)
289{
290 return set_irq_wake(irq, 0);
291}
292
Ingo Molnarc01d4032006-07-03 00:24:27 -0700293#else /* !CONFIG_GENERIC_HARDIRQS */
294/*
295 * NOTE: non-genirq architectures, if they want to support the lock
296 * validator need to define the methods below in their asm/irq.h
297 * files, under an #ifdef CONFIG_LOCKDEP section.
298 */
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200299#ifndef CONFIG_LOCKDEP
Ingo Molnarc01d4032006-07-03 00:24:27 -0700300# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200301# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
302 disable_irq_nosync(irq)
Ingo Molnarc01d4032006-07-03 00:24:27 -0700303# define disable_irq_lockdep(irq) disable_irq(irq)
304# define enable_irq_lockdep(irq) enable_irq(irq)
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200305# define enable_irq_lockdep_irqrestore(irq, flags) \
306 enable_irq(irq)
Ingo Molnarc01d4032006-07-03 00:24:27 -0700307# endif
308
Guennadi Liakhovetskiaa5346a2007-10-16 01:24:01 -0700309static inline int enable_irq_wake(unsigned int irq)
310{
311 return 0;
312}
313
314static inline int disable_irq_wake(unsigned int irq)
315{
316 return 0;
317}
Ingo Molnarc01d4032006-07-03 00:24:27 -0700318#endif /* CONFIG_GENERIC_HARDIRQS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Andi Kleen3f744782005-09-12 18:49:24 +0200320#ifndef __ARCH_SET_SOFTIRQ_PENDING
321#define set_softirq_pending(x) (local_softirq_pending() = (x))
322#define or_softirq_pending(x) (local_softirq_pending() |= (x))
323#endif
324
Benjamin Herrenschmidt2d3fbbb2007-05-10 22:22:46 -0700325/* Some architectures might implement lazy enabling/disabling of
326 * interrupts. In some cases, such as stop_machine, we might want
327 * to ensure that after a local_irq_disable(), interrupts have
328 * really been disabled in hardware. Such architectures need to
329 * implement the following hook.
330 */
331#ifndef hard_irq_disable
332#define hard_irq_disable() do { } while(0)
333#endif
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
336 frequency threaded job scheduling. For almost all the purposes
337 tasklets are more than enough. F.e. all serial device BHs et
338 al. should be converted to tasklets, not to softirqs.
339 */
340
341enum
342{
343 HI_SOFTIRQ=0,
344 TIMER_SOFTIRQ,
345 NET_TX_SOFTIRQ,
346 NET_RX_SOFTIRQ,
Jens Axboeff856ba2006-01-09 16:02:34 +0100347 BLOCK_SOFTIRQ,
Jens Axboe5e605b62009-08-05 09:07:21 +0200348 BLOCK_IOPOLL_SOFTIRQ,
Christoph Lameterc9819f42006-12-10 02:20:25 -0800349 TASKLET_SOFTIRQ,
350 SCHED_SOFTIRQ,
Peter Zijlstraa6037b62009-01-05 11:28:22 +0100351 HRTIMER_SOFTIRQ,
352 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
Alexey Dobriyan978b0112008-09-06 20:04:36 +0200353
354 NR_SOFTIRQS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355};
356
Jason Baron5d592b42009-03-12 14:33:36 -0400357/* map softirq index to softirq name. update 'softirq_to_name' in
358 * kernel/softirq.c when adding a new softirq.
359 */
360extern char *softirq_to_name[NR_SOFTIRQS];
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362/* softirq mask and active fields moved to irq_cpustat_t in
363 * asm/hardirq.h to get better cache usage. KAO
364 */
365
366struct softirq_action
367{
368 void (*action)(struct softirq_action *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369};
370
371asmlinkage void do_softirq(void);
Adrian Bunkeb0f1c42008-04-29 00:59:12 -0700372asmlinkage void __do_softirq(void);
Carlos R. Mafra962cf362008-05-15 11:15:37 -0300373extern void open_softirq(int nr, void (*action)(struct softirq_action *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374extern void softirq_init(void);
Andi Kleen3f744782005-09-12 18:49:24 +0200375#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800376extern void raise_softirq_irqoff(unsigned int nr);
377extern void raise_softirq(unsigned int nr);
Peter Zijlstra7f1e2ca2009-03-13 12:21:27 +0100378extern void wakeup_softirqd(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
David S. Miller54514a72008-09-23 22:15:57 -0700380/* This is the worklist that queues up per-cpu softirq work.
381 *
382 * send_remote_sendirq() adds work to these lists, and
383 * the softirq handler itself dequeues from them. The queues
384 * are protected by disabling local cpu interrupts and they must
385 * only be accessed by the local cpu that they are for.
386 */
387DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
388
389/* Try to send a softirq to a remote cpu. If this cannot be done, the
390 * work will be queued to the local cpu.
391 */
392extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
393
394/* Like send_remote_softirq(), but the caller must disable local cpu interrupts
395 * and compute the current cpu, passed in as 'this_cpu'.
396 */
397extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
398 int this_cpu, int softirq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400/* Tasklets --- multithreaded analogue of BHs.
401
402 Main feature differing them of generic softirqs: tasklet
403 is running only on one CPU simultaneously.
404
405 Main feature differing them of BHs: different tasklets
406 may be run simultaneously on different CPUs.
407
408 Properties:
409 * If tasklet_schedule() is called, then tasklet is guaranteed
410 to be executed on some cpu at least once after this.
411 * If the tasklet is already scheduled, but its excecution is still not
412 started, it will be executed only once.
413 * If this tasklet is already running on another CPU (or schedule is called
414 from tasklet itself), it is rescheduled for later.
415 * Tasklet is strictly serialized wrt itself, but not
416 wrt another tasklets. If client needs some intertask synchronization,
417 he makes it with spinlocks.
418 */
419
420struct tasklet_struct
421{
422 struct tasklet_struct *next;
423 unsigned long state;
424 atomic_t count;
425 void (*func)(unsigned long);
426 unsigned long data;
427};
428
429#define DECLARE_TASKLET(name, func, data) \
430struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
431
432#define DECLARE_TASKLET_DISABLED(name, func, data) \
433struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
434
435
436enum
437{
438 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
439 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
440};
441
442#ifdef CONFIG_SMP
443static inline int tasklet_trylock(struct tasklet_struct *t)
444{
445 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
446}
447
448static inline void tasklet_unlock(struct tasklet_struct *t)
449{
450 smp_mb__before_clear_bit();
451 clear_bit(TASKLET_STATE_RUN, &(t)->state);
452}
453
454static inline void tasklet_unlock_wait(struct tasklet_struct *t)
455{
456 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
457}
458#else
459#define tasklet_trylock(t) 1
460#define tasklet_unlock_wait(t) do { } while (0)
461#define tasklet_unlock(t) do { } while (0)
462#endif
463
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800464extern void __tasklet_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
466static inline void tasklet_schedule(struct tasklet_struct *t)
467{
468 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
469 __tasklet_schedule(t);
470}
471
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800472extern void __tasklet_hi_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474static inline void tasklet_hi_schedule(struct tasklet_struct *t)
475{
476 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
477 __tasklet_hi_schedule(t);
478}
479
Vegard Nossum7c692cb2008-05-21 22:53:13 +0200480extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
481
482/*
483 * This version avoids touching any other tasklets. Needed for kmemcheck
484 * in order not to take any page faults while enqueueing this tasklet;
485 * consider VERY carefully whether you really need this or
486 * tasklet_hi_schedule()...
487 */
488static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
489{
490 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
491 __tasklet_hi_schedule_first(t);
492}
493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495static inline void tasklet_disable_nosync(struct tasklet_struct *t)
496{
497 atomic_inc(&t->count);
498 smp_mb__after_atomic_inc();
499}
500
501static inline void tasklet_disable(struct tasklet_struct *t)
502{
503 tasklet_disable_nosync(t);
504 tasklet_unlock_wait(t);
505 smp_mb();
506}
507
508static inline void tasklet_enable(struct tasklet_struct *t)
509{
510 smp_mb__before_atomic_dec();
511 atomic_dec(&t->count);
512}
513
514static inline void tasklet_hi_enable(struct tasklet_struct *t)
515{
516 smp_mb__before_atomic_dec();
517 atomic_dec(&t->count);
518}
519
520extern void tasklet_kill(struct tasklet_struct *t);
521extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
522extern void tasklet_init(struct tasklet_struct *t,
523 void (*func)(unsigned long), unsigned long data);
524
Peter Zijlstra9ba5f002009-07-22 14:18:35 +0200525struct tasklet_hrtimer {
526 struct hrtimer timer;
527 struct tasklet_struct tasklet;
528 enum hrtimer_restart (*function)(struct hrtimer *);
529};
530
531extern void
532tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
533 enum hrtimer_restart (*function)(struct hrtimer *),
534 clockid_t which_clock, enum hrtimer_mode mode);
535
536static inline
537int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
538 const enum hrtimer_mode mode)
539{
540 return hrtimer_start(&ttimer->timer, time, mode);
541}
542
543static inline
544void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
545{
546 hrtimer_cancel(&ttimer->timer);
547 tasklet_kill(&ttimer->tasklet);
548}
549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550/*
551 * Autoprobing for irqs:
552 *
553 * probe_irq_on() and probe_irq_off() provide robust primitives
554 * for accurate IRQ probing during kernel initialization. They are
555 * reasonably simple to use, are not "fooled" by spurious interrupts,
556 * and, unlike other attempts at IRQ probing, they do not get hung on
557 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
558 *
559 * For reasonably foolproof probing, use them as follows:
560 *
561 * 1. clear and/or mask the device's internal interrupt.
562 * 2. sti();
563 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
564 * 4. enable the device and cause it to trigger an interrupt.
565 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
566 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
567 * 7. service the device to clear its pending interrupt.
568 * 8. loop again if paranoia is required.
569 *
570 * probe_irq_on() returns a mask of allocated irq's.
571 *
572 * probe_irq_off() takes the mask as a parameter,
573 * and returns the irq number which occurred,
574 * or zero if none occurred, or a negative irq number
575 * if more than one irq occurred.
576 */
577
578#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
579static inline unsigned long probe_irq_on(void)
580{
581 return 0;
582}
583static inline int probe_irq_off(unsigned long val)
584{
585 return 0;
586}
587static inline unsigned int probe_irq_mask(unsigned long val)
588{
589 return 0;
590}
591#else
592extern unsigned long probe_irq_on(void); /* returns 0 on failure */
593extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
594extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
595#endif
596
Andrew Morton6168a702007-02-17 21:22:39 -0800597#ifdef CONFIG_PROC_FS
598/* Initialize /proc/irq/ */
599extern void init_irq_proc(void);
600#else
601static inline void init_irq_proc(void)
602{
603}
604#endif
605
Ingo Molnar74296a82009-01-16 17:43:50 +0100606#if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ)
607extern void debug_poll_all_shared_irqs(void);
608#else
609static inline void debug_poll_all_shared_irqs(void) { }
610#endif
611
Alexey Dobriyand43c36d2009-10-07 17:09:06 +0400612struct seq_file;
Adrian Bunkf74596d2008-02-06 01:36:35 -0800613int show_interrupts(struct seq_file *p, void *v);
614
Yinghai Lu43a25632008-12-28 16:01:13 -0800615struct irq_desc;
616
617extern int early_irq_init(void);
Yinghai Lu4a046d12009-01-12 17:39:24 -0800618extern int arch_probe_nr_irqs(void);
Yinghai Lu43a25632008-12-28 16:01:13 -0800619extern int arch_early_irq_init(void);
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700620extern int arch_init_chip_data(struct irq_desc *desc, int node);
Yinghai Lu43a25632008-12-28 16:01:13 -0800621
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622#endif