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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>
Al Virof0373602005-11-13 16:06:57 -080013#include <linux/sched.h>
Ingo Molnarde30a2b2006-07-03 00:24:42 -070014#include <linux/irqflags.h>
David S. Miller54514a72008-09-23 22:15:57 -070015#include <linux/smp.h>
16#include <linux/percpu.h>
Peter Zijlstra9ba5f002009-07-22 14:18:35 +020017#include <linux/hrtimer.h>
Ingo Molnar0ebb26e2008-12-12 11:26:39 +010018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/atomic.h>
20#include <asm/ptrace.h>
21#include <asm/system.h>
22
Thomas Gleixner6e213612006-07-01 19:29:03 -070023/*
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
Thomas Gleixner950f4422007-02-16 01:27:24 -080048 * IRQF_PERCPU - Interrupt is per cpu
49 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
Bernhard Walled85a60d2007-05-08 00:35:24 -070050 * 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)
Thomas Gleixnerb25c3402009-08-13 12:17:22 +020053 * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
54 * Used by threaded interrupts which need to keep the
55 * irq line disabled until the threaded handler has been run.
Thomas Gleixner6e213612006-07-01 19:29:03 -070056 */
57#define IRQF_DISABLED 0x00000020
58#define IRQF_SAMPLE_RANDOM 0x00000040
59#define IRQF_SHARED 0x00000080
60#define IRQF_PROBE_SHARED 0x00000100
61#define IRQF_TIMER 0x00000200
Thomas Gleixner284c6682006-07-03 02:20:32 +020062#define IRQF_PERCPU 0x00000400
Thomas Gleixner950f4422007-02-16 01:27:24 -080063#define IRQF_NOBALANCING 0x00000800
Bernhard Walled85a60d2007-05-08 00:35:24 -070064#define IRQF_IRQPOLL 0x00001000
Thomas Gleixnerb25c3402009-08-13 12:17:22 +020065#define IRQF_ONESHOT 0x00002000
Thomas Gleixner6e213612006-07-01 19:29:03 -070066
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010067/*
68 * Bits used by threaded handlers:
69 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
70 * IRQTF_DIED - handler thread died
Thomas Gleixnerf48fe812009-03-24 11:46:22 +010071 * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
Thomas Gleixner591d2fb2009-07-21 11:09:39 +020072 * IRQTF_AFFINITY - irq thread is requested to adjust affinity
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010073 */
74enum {
75 IRQTF_RUNTHREAD,
76 IRQTF_DIED,
Thomas Gleixnerf48fe812009-03-24 11:46:22 +010077 IRQTF_WARNED,
Thomas Gleixner591d2fb2009-07-21 11:09:39 +020078 IRQTF_AFFINITY,
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010079};
80
David Howells7d12e782006-10-05 14:55:46 +010081typedef irqreturn_t (*irq_handler_t)(int, void *);
David Howellsda482792006-10-05 13:06:34 +010082
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010083/**
84 * struct irqaction - per interrupt action descriptor
85 * @handler: interrupt handler function
86 * @flags: flags (see IRQF_* above)
87 * @mask: no comment as it is useless and about to be removed
88 * @name: name of the device
89 * @dev_id: cookie to identify the device
90 * @next: pointer to the next irqaction for shared interrupts
91 * @irq: interrupt number
92 * @dir: pointer to the proc/irq/NN/name entry
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010093 * @thread_fn: interupt handler function for threaded interrupts
94 * @thread: thread pointer for threaded interrupts
95 * @thread_flags: flags related to @thread
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010096 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070097struct irqaction {
David Howellsda482792006-10-05 13:06:34 +010098 irq_handler_t handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 unsigned long flags;
100 cpumask_t mask;
101 const char *name;
102 void *dev_id;
103 struct irqaction *next;
104 int irq;
105 struct proc_dir_entry *dir;
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100106 irq_handler_t thread_fn;
107 struct task_struct *thread;
108 unsigned long thread_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109};
110
David Howells7d12e782006-10-05 14:55:46 +0100111extern irqreturn_t no_action(int cpl, void *dev_id);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100112
Thomas Gleixner3a381482009-03-24 20:27:39 +0100113#ifdef CONFIG_GENERIC_HARDIRQS
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100114extern int __must_check
115request_threaded_irq(unsigned int irq, irq_handler_t handler,
116 irq_handler_t thread_fn,
117 unsigned long flags, const char *name, void *dev);
118
119static inline int __must_check
120request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
121 const char *name, void *dev)
122{
123 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
124}
125
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100126extern void exit_irq_thread(void);
127#else
Thomas Gleixner3a381482009-03-24 20:27:39 +0100128
129extern int __must_check
130request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
131 const char *name, void *dev);
132
Thomas Gleixnerde188362009-03-25 17:33:38 +0100133/*
134 * Special function to avoid ifdeffery in kernel/irq/devres.c which
135 * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
136 * m68k). I really love these $@%#!* obvious Makefile references:
137 * ../../../kernel/irq/devres.o
138 */
139static inline int __must_check
140request_threaded_irq(unsigned int irq, irq_handler_t handler,
141 irq_handler_t thread_fn,
142 unsigned long flags, const char *name, void *dev)
143{
144 return request_irq(irq, handler, flags, name, dev);
145}
146
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100147static inline void exit_irq_thread(void) { }
148#endif
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150extern void free_irq(unsigned int, void *);
151
Al Viro0af36782007-07-27 14:24:33 +0100152struct device;
153
Arjan van de Ven935bd5b2009-03-23 18:28:16 +0100154extern int __must_check
155devm_request_threaded_irq(struct device *dev, unsigned int irq,
156 irq_handler_t handler, irq_handler_t thread_fn,
157 unsigned long irqflags, const char *devname,
158 void *dev_id);
159
160static inline int __must_check
161devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
162 unsigned long irqflags, const char *devname, void *dev_id)
163{
164 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
165 devname, dev_id);
166}
167
Tejun Heo9ac78492007-01-20 16:00:26 +0900168extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
169
Ingo Molnard7e96292006-07-03 00:24:27 -0700170/*
171 * On lockdep we dont want to enable hardirqs in hardirq
172 * context. Use local_irq_enable_in_hardirq() to annotate
173 * kernel code that has to do this nevertheless (pretty much
174 * the only valid case is for old/broken hardware that is
175 * insanely slow).
176 *
177 * NOTE: in theory this might break fragile code that relies
178 * on hardirq delivery - in practice we dont seem to have such
179 * places left. So the only effect should be slightly increased
180 * irqs-off latencies.
181 */
182#ifdef CONFIG_LOCKDEP
183# define local_irq_enable_in_hardirq() do { } while (0)
184#else
185# define local_irq_enable_in_hardirq() local_irq_enable()
186#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188extern void disable_irq_nosync(unsigned int irq);
189extern void disable_irq(unsigned int irq);
190extern void enable_irq(unsigned int irq);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700191
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100192/* The following three functions are for the core kernel use only. */
Heiko Carstens5818a6e2009-06-11 21:59:21 +0200193#ifdef CONFIG_GENERIC_HARDIRQS
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100194extern void suspend_device_irqs(void);
195extern void resume_device_irqs(void);
196#ifdef CONFIG_PM_SLEEP
197extern int check_wakeup_irqs(void);
198#else
199static inline int check_wakeup_irqs(void) { return 0; }
200#endif
Heiko Carstens5818a6e2009-06-11 21:59:21 +0200201#else
202static inline void suspend_device_irqs(void) { };
203static inline void resume_device_irqs(void) { };
204static inline int check_wakeup_irqs(void) { return 0; }
205#endif
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100206
Russell Kingd7b90682008-04-17 07:46:24 +0200207#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
208
Rusty Russelld036e672009-01-01 10:12:26 +1030209extern cpumask_var_t irq_default_affinity;
Max Krasnyansky18404752008-05-29 11:02:52 -0700210
Rusty Russell0de26522008-12-13 21:20:26 +1030211extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
Russell Kingd7b90682008-04-17 07:46:24 +0200212extern int irq_can_set_affinity(unsigned int irq);
Max Krasnyansky18404752008-05-29 11:02:52 -0700213extern int irq_select_affinity(unsigned int irq);
Russell Kingd7b90682008-04-17 07:46:24 +0200214
215#else /* CONFIG_SMP */
216
Rusty Russell0de26522008-12-13 21:20:26 +1030217static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
Russell Kingd7b90682008-04-17 07:46:24 +0200218{
219 return -EINVAL;
220}
221
222static inline int irq_can_set_affinity(unsigned int irq)
223{
224 return 0;
225}
226
Max Krasnyansky18404752008-05-29 11:02:52 -0700227static inline int irq_select_affinity(unsigned int irq) { return 0; }
228
Russell Kingd7b90682008-04-17 07:46:24 +0200229#endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
230
Al Viroe9ed7e72007-07-21 23:29:12 +0100231#ifdef CONFIG_GENERIC_HARDIRQS
Ingo Molnarc01d4032006-07-03 00:24:27 -0700232/*
233 * Special lockdep variants of irq disabling/enabling.
234 * These should be used for locking constructs that
235 * know that a particular irq context which is disabled,
236 * and which is the only irq-context user of a lock,
237 * that it's safe to take the lock in the irq-disabled
238 * section without disabling hardirqs.
239 *
240 * On !CONFIG_LOCKDEP they are equivalent to the normal
241 * irq disable/enable methods.
242 */
243static inline void disable_irq_nosync_lockdep(unsigned int irq)
244{
245 disable_irq_nosync(irq);
246#ifdef CONFIG_LOCKDEP
247 local_irq_disable();
248#endif
249}
250
Arjan van de Vene8106b92006-09-29 02:01:08 -0700251static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
252{
253 disable_irq_nosync(irq);
254#ifdef CONFIG_LOCKDEP
255 local_irq_save(*flags);
256#endif
257}
258
Ingo Molnarc01d4032006-07-03 00:24:27 -0700259static inline void disable_irq_lockdep(unsigned int irq)
260{
261 disable_irq(irq);
262#ifdef CONFIG_LOCKDEP
263 local_irq_disable();
264#endif
265}
266
267static inline void enable_irq_lockdep(unsigned int irq)
268{
269#ifdef CONFIG_LOCKDEP
270 local_irq_enable();
271#endif
272 enable_irq(irq);
273}
274
Arjan van de Vene8106b92006-09-29 02:01:08 -0700275static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
276{
277#ifdef CONFIG_LOCKDEP
278 local_irq_restore(*flags);
279#endif
280 enable_irq(irq);
281}
282
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700283/* IRQ wakeup (PM) control: */
284extern int set_irq_wake(unsigned int irq, unsigned int on);
285
286static inline int enable_irq_wake(unsigned int irq)
287{
288 return set_irq_wake(irq, 1);
289}
290
291static inline int disable_irq_wake(unsigned int irq)
292{
293 return set_irq_wake(irq, 0);
294}
295
Ingo Molnarc01d4032006-07-03 00:24:27 -0700296#else /* !CONFIG_GENERIC_HARDIRQS */
297/*
298 * NOTE: non-genirq architectures, if they want to support the lock
299 * validator need to define the methods below in their asm/irq.h
300 * files, under an #ifdef CONFIG_LOCKDEP section.
301 */
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200302#ifndef CONFIG_LOCKDEP
Ingo Molnarc01d4032006-07-03 00:24:27 -0700303# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200304# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
305 disable_irq_nosync(irq)
Ingo Molnarc01d4032006-07-03 00:24:27 -0700306# define disable_irq_lockdep(irq) disable_irq(irq)
307# define enable_irq_lockdep(irq) enable_irq(irq)
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200308# define enable_irq_lockdep_irqrestore(irq, flags) \
309 enable_irq(irq)
Ingo Molnarc01d4032006-07-03 00:24:27 -0700310# endif
311
Guennadi Liakhovetskiaa5346a2007-10-16 01:24:01 -0700312static inline int enable_irq_wake(unsigned int irq)
313{
314 return 0;
315}
316
317static inline int disable_irq_wake(unsigned int irq)
318{
319 return 0;
320}
Ingo Molnarc01d4032006-07-03 00:24:27 -0700321#endif /* CONFIG_GENERIC_HARDIRQS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Andi Kleen3f744782005-09-12 18:49:24 +0200323#ifndef __ARCH_SET_SOFTIRQ_PENDING
324#define set_softirq_pending(x) (local_softirq_pending() = (x))
325#define or_softirq_pending(x) (local_softirq_pending() |= (x))
326#endif
327
Benjamin Herrenschmidt2d3fbbb2007-05-10 22:22:46 -0700328/* Some architectures might implement lazy enabling/disabling of
329 * interrupts. In some cases, such as stop_machine, we might want
330 * to ensure that after a local_irq_disable(), interrupts have
331 * really been disabled in hardware. Such architectures need to
332 * implement the following hook.
333 */
334#ifndef hard_irq_disable
335#define hard_irq_disable() do { } while(0)
336#endif
337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
339 frequency threaded job scheduling. For almost all the purposes
340 tasklets are more than enough. F.e. all serial device BHs et
341 al. should be converted to tasklets, not to softirqs.
342 */
343
344enum
345{
346 HI_SOFTIRQ=0,
347 TIMER_SOFTIRQ,
348 NET_TX_SOFTIRQ,
349 NET_RX_SOFTIRQ,
Jens Axboeff856ba2006-01-09 16:02:34 +0100350 BLOCK_SOFTIRQ,
Christoph Lameterc9819f42006-12-10 02:20:25 -0800351 TASKLET_SOFTIRQ,
352 SCHED_SOFTIRQ,
Peter Zijlstraa6037b62009-01-05 11:28:22 +0100353 HRTIMER_SOFTIRQ,
354 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
Alexey Dobriyan978b0112008-09-06 20:04:36 +0200355
356 NR_SOFTIRQS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357};
358
Jason Baron5d592b42009-03-12 14:33:36 -0400359/* map softirq index to softirq name. update 'softirq_to_name' in
360 * kernel/softirq.c when adding a new softirq.
361 */
362extern char *softirq_to_name[NR_SOFTIRQS];
363
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364/* softirq mask and active fields moved to irq_cpustat_t in
365 * asm/hardirq.h to get better cache usage. KAO
366 */
367
368struct softirq_action
369{
370 void (*action)(struct softirq_action *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371};
372
373asmlinkage void do_softirq(void);
Adrian Bunkeb0f1c42008-04-29 00:59:12 -0700374asmlinkage void __do_softirq(void);
Carlos R. Mafra962cf362008-05-15 11:15:37 -0300375extern void open_softirq(int nr, void (*action)(struct softirq_action *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376extern void softirq_init(void);
Andi Kleen3f744782005-09-12 18:49:24 +0200377#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800378extern void raise_softirq_irqoff(unsigned int nr);
379extern void raise_softirq(unsigned int nr);
Peter Zijlstra7f1e2ca2009-03-13 12:21:27 +0100380extern void wakeup_softirqd(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
David S. Miller54514a72008-09-23 22:15:57 -0700382/* This is the worklist that queues up per-cpu softirq work.
383 *
384 * send_remote_sendirq() adds work to these lists, and
385 * the softirq handler itself dequeues from them. The queues
386 * are protected by disabling local cpu interrupts and they must
387 * only be accessed by the local cpu that they are for.
388 */
389DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
390
391/* Try to send a softirq to a remote cpu. If this cannot be done, the
392 * work will be queued to the local cpu.
393 */
394extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
395
396/* Like send_remote_softirq(), but the caller must disable local cpu interrupts
397 * and compute the current cpu, passed in as 'this_cpu'.
398 */
399extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
400 int this_cpu, int softirq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402/* Tasklets --- multithreaded analogue of BHs.
403
404 Main feature differing them of generic softirqs: tasklet
405 is running only on one CPU simultaneously.
406
407 Main feature differing them of BHs: different tasklets
408 may be run simultaneously on different CPUs.
409
410 Properties:
411 * If tasklet_schedule() is called, then tasklet is guaranteed
412 to be executed on some cpu at least once after this.
413 * If the tasklet is already scheduled, but its excecution is still not
414 started, it will be executed only once.
415 * If this tasklet is already running on another CPU (or schedule is called
416 from tasklet itself), it is rescheduled for later.
417 * Tasklet is strictly serialized wrt itself, but not
418 wrt another tasklets. If client needs some intertask synchronization,
419 he makes it with spinlocks.
420 */
421
422struct tasklet_struct
423{
424 struct tasklet_struct *next;
425 unsigned long state;
426 atomic_t count;
427 void (*func)(unsigned long);
428 unsigned long data;
429};
430
431#define DECLARE_TASKLET(name, func, data) \
432struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
433
434#define DECLARE_TASKLET_DISABLED(name, func, data) \
435struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
436
437
438enum
439{
440 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
441 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
442};
443
444#ifdef CONFIG_SMP
445static inline int tasklet_trylock(struct tasklet_struct *t)
446{
447 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
448}
449
450static inline void tasklet_unlock(struct tasklet_struct *t)
451{
452 smp_mb__before_clear_bit();
453 clear_bit(TASKLET_STATE_RUN, &(t)->state);
454}
455
456static inline void tasklet_unlock_wait(struct tasklet_struct *t)
457{
458 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
459}
460#else
461#define tasklet_trylock(t) 1
462#define tasklet_unlock_wait(t) do { } while (0)
463#define tasklet_unlock(t) do { } while (0)
464#endif
465
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800466extern void __tasklet_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468static inline void tasklet_schedule(struct tasklet_struct *t)
469{
470 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
471 __tasklet_schedule(t);
472}
473
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800474extern void __tasklet_hi_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476static inline void tasklet_hi_schedule(struct tasklet_struct *t)
477{
478 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
479 __tasklet_hi_schedule(t);
480}
481
Vegard Nossum7c692cb2008-05-21 22:53:13 +0200482extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
483
484/*
485 * This version avoids touching any other tasklets. Needed for kmemcheck
486 * in order not to take any page faults while enqueueing this tasklet;
487 * consider VERY carefully whether you really need this or
488 * tasklet_hi_schedule()...
489 */
490static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
491{
492 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
493 __tasklet_hi_schedule_first(t);
494}
495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497static inline void tasklet_disable_nosync(struct tasklet_struct *t)
498{
499 atomic_inc(&t->count);
500 smp_mb__after_atomic_inc();
501}
502
503static inline void tasklet_disable(struct tasklet_struct *t)
504{
505 tasklet_disable_nosync(t);
506 tasklet_unlock_wait(t);
507 smp_mb();
508}
509
510static inline void tasklet_enable(struct tasklet_struct *t)
511{
512 smp_mb__before_atomic_dec();
513 atomic_dec(&t->count);
514}
515
516static inline void tasklet_hi_enable(struct tasklet_struct *t)
517{
518 smp_mb__before_atomic_dec();
519 atomic_dec(&t->count);
520}
521
522extern void tasklet_kill(struct tasklet_struct *t);
523extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
524extern void tasklet_init(struct tasklet_struct *t,
525 void (*func)(unsigned long), unsigned long data);
526
Peter Zijlstra9ba5f002009-07-22 14:18:35 +0200527struct tasklet_hrtimer {
528 struct hrtimer timer;
529 struct tasklet_struct tasklet;
530 enum hrtimer_restart (*function)(struct hrtimer *);
531};
532
533extern void
534tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
535 enum hrtimer_restart (*function)(struct hrtimer *),
536 clockid_t which_clock, enum hrtimer_mode mode);
537
538static inline
539int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
540 const enum hrtimer_mode mode)
541{
542 return hrtimer_start(&ttimer->timer, time, mode);
543}
544
545static inline
546void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
547{
548 hrtimer_cancel(&ttimer->timer);
549 tasklet_kill(&ttimer->tasklet);
550}
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552/*
553 * Autoprobing for irqs:
554 *
555 * probe_irq_on() and probe_irq_off() provide robust primitives
556 * for accurate IRQ probing during kernel initialization. They are
557 * reasonably simple to use, are not "fooled" by spurious interrupts,
558 * and, unlike other attempts at IRQ probing, they do not get hung on
559 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
560 *
561 * For reasonably foolproof probing, use them as follows:
562 *
563 * 1. clear and/or mask the device's internal interrupt.
564 * 2. sti();
565 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
566 * 4. enable the device and cause it to trigger an interrupt.
567 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
568 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
569 * 7. service the device to clear its pending interrupt.
570 * 8. loop again if paranoia is required.
571 *
572 * probe_irq_on() returns a mask of allocated irq's.
573 *
574 * probe_irq_off() takes the mask as a parameter,
575 * and returns the irq number which occurred,
576 * or zero if none occurred, or a negative irq number
577 * if more than one irq occurred.
578 */
579
580#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
581static inline unsigned long probe_irq_on(void)
582{
583 return 0;
584}
585static inline int probe_irq_off(unsigned long val)
586{
587 return 0;
588}
589static inline unsigned int probe_irq_mask(unsigned long val)
590{
591 return 0;
592}
593#else
594extern unsigned long probe_irq_on(void); /* returns 0 on failure */
595extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
596extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
597#endif
598
Andrew Morton6168a702007-02-17 21:22:39 -0800599#ifdef CONFIG_PROC_FS
600/* Initialize /proc/irq/ */
601extern void init_irq_proc(void);
602#else
603static inline void init_irq_proc(void)
604{
605}
606#endif
607
Ingo Molnar74296a82009-01-16 17:43:50 +0100608#if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ)
609extern void debug_poll_all_shared_irqs(void);
610#else
611static inline void debug_poll_all_shared_irqs(void) { }
612#endif
613
Adrian Bunkf74596d2008-02-06 01:36:35 -0800614int show_interrupts(struct seq_file *p, void *v);
615
Yinghai Lu43a25632008-12-28 16:01:13 -0800616struct irq_desc;
617
618extern int early_irq_init(void);
Yinghai Lu4a046d12009-01-12 17:39:24 -0800619extern int arch_probe_nr_irqs(void);
Yinghai Lu43a25632008-12-28 16:01:13 -0800620extern int arch_early_irq_init(void);
Yinghai Lu85ac16d2009-04-27 18:00:38 -0700621extern int arch_init_chip_data(struct irq_desc *desc, int node);
Yinghai Lu43a25632008-12-28 16:01:13 -0800622
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623#endif