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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>
Ben Hutchingscd7eab42011-01-19 21:01:44 +000017#include <linux/kref.h>
18#include <linux/workqueue.h>
Ingo Molnar0ebb26e2008-12-12 11:26:39 +010019
Arun Sharma600634972011-07-26 16:09:06 -070020#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <asm/ptrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
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 *
Thomas Gleixner6932bf32010-03-26 00:06:55 +000043 * IRQF_DISABLED - keep irqs disabled when calling the action handler.
44 * DEPRECATED. This flag is a NOOP and scheduled to be removed
Thomas Gleixner6e213612006-07-01 19:29:03 -070045 * 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.
Ian Campbell685fd0b2010-07-29 11:16:32 +010056 * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend
Thomas Gleixnerdc5f2192011-02-04 13:19:20 +010057 * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
Thomas Gleixner0c4602f2011-02-23 23:52:18 +000058 * IRQF_NO_THREAD - Interrupt cannot be threaded
Ian Campbell9bab0b72011-10-03 15:37:00 +010059 * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
60 * resume time.
Thomas Gleixner6e213612006-07-01 19:29:03 -070061 */
62#define IRQF_DISABLED 0x00000020
Thomas Gleixner6e213612006-07-01 19:29:03 -070063#define IRQF_SHARED 0x00000080
64#define IRQF_PROBE_SHARED 0x00000100
Ian Campbell685fd0b2010-07-29 11:16:32 +010065#define __IRQF_TIMER 0x00000200
Thomas Gleixner284c6682006-07-03 02:20:32 +020066#define IRQF_PERCPU 0x00000400
Thomas Gleixner950f4422007-02-16 01:27:24 -080067#define IRQF_NOBALANCING 0x00000800
Bernhard Walled85a60d2007-05-08 00:35:24 -070068#define IRQF_IRQPOLL 0x00001000
Thomas Gleixnerb25c3402009-08-13 12:17:22 +020069#define IRQF_ONESHOT 0x00002000
Ian Campbell685fd0b2010-07-29 11:16:32 +010070#define IRQF_NO_SUSPEND 0x00004000
Thomas Gleixnerdc5f2192011-02-04 13:19:20 +010071#define IRQF_FORCE_RESUME 0x00008000
Thomas Gleixner0c4602f2011-02-23 23:52:18 +000072#define IRQF_NO_THREAD 0x00010000
Ian Campbell9bab0b72011-10-03 15:37:00 +010073#define IRQF_EARLY_RESUME 0x00020000
Ian Campbell685fd0b2010-07-29 11:16:32 +010074
Thomas Gleixner0c4602f2011-02-23 23:52:18 +000075#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010076
Randy Dunlapb4e6b092010-05-21 09:03:01 -070077/*
Marc Zyngierae731f82010-03-15 22:56:33 +000078 * These values can be returned by request_any_context_irq() and
79 * describe the context the interrupt will be run in.
80 *
81 * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
82 * IRQC_IS_NESTED - interrupt runs in a nested threaded context
83 */
84enum {
85 IRQC_IS_HARDIRQ = 0,
86 IRQC_IS_NESTED,
87};
88
David Howells7d12e782006-10-05 14:55:46 +010089typedef irqreturn_t (*irq_handler_t)(int, void *);
David Howellsda482792006-10-05 13:06:34 +010090
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010091/**
92 * struct irqaction - per interrupt action descriptor
93 * @handler: interrupt handler function
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010094 * @name: name of the device
95 * @dev_id: cookie to identify the device
Marc Zyngier31d9d9b2011-09-23 17:03:06 +010096 * @percpu_dev_id: cookie to identify the device
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010097 * @next: pointer to the next irqaction for shared interrupts
98 * @irq: interrupt number
Thomas Gleixnerc0ecaa02012-04-19 11:53:25 +020099 * @flags: flags (see IRQF_* above)
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300100 * @thread_fn: interrupt handler function for threaded interrupts
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100101 * @thread: thread pointer for threaded interrupts
102 * @thread_flags: flags related to @thread
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000103 * @thread_mask: bitmask for keeping track of @thread activity
Thomas Gleixnerc0ecaa02012-04-19 11:53:25 +0200104 * @dir: pointer to the proc/irq/NN/name entry
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +0100105 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106struct irqaction {
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100107 irq_handler_t handler;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100108 void *dev_id;
109 void __percpu *percpu_dev_id;
110 struct irqaction *next;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100111 irq_handler_t thread_fn;
112 struct task_struct *thread;
Thomas Gleixnerc0ecaa02012-04-19 11:53:25 +0200113 unsigned int irq;
114 unsigned int flags;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100115 unsigned long thread_flags;
116 unsigned long thread_mask;
117 const char *name;
118 struct proc_dir_entry *dir;
Eric Dumazetf6cd2472010-11-04 11:13:48 +0100119} ____cacheline_internodealigned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
David Howells7d12e782006-10-05 14:55:46 +0100121extern irqreturn_t no_action(int cpl, void *dev_id);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100122
Thomas Gleixner3a381482009-03-24 20:27:39 +0100123#ifdef CONFIG_GENERIC_HARDIRQS
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100124extern int __must_check
125request_threaded_irq(unsigned int irq, irq_handler_t handler,
126 irq_handler_t thread_fn,
127 unsigned long flags, const char *name, void *dev);
128
129static inline int __must_check
130request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
131 const char *name, void *dev)
132{
133 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
134}
135
Marc Zyngierae731f82010-03-15 22:56:33 +0000136extern int __must_check
137request_any_context_irq(unsigned int irq, irq_handler_t handler,
138 unsigned long flags, const char *name, void *dev_id);
139
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100140extern int __must_check
141request_percpu_irq(unsigned int irq, irq_handler_t handler,
142 const char *devname, void __percpu *percpu_dev_id);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100143#else
Thomas Gleixner3a381482009-03-24 20:27:39 +0100144
145extern int __must_check
146request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
147 const char *name, void *dev);
148
Thomas Gleixnerde188362009-03-25 17:33:38 +0100149/*
150 * Special function to avoid ifdeffery in kernel/irq/devres.c which
151 * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
152 * m68k). I really love these $@%#!* obvious Makefile references:
153 * ../../../kernel/irq/devres.o
154 */
155static inline int __must_check
156request_threaded_irq(unsigned int irq, irq_handler_t handler,
157 irq_handler_t thread_fn,
158 unsigned long flags, const char *name, void *dev)
159{
160 return request_irq(irq, handler, flags, name, dev);
161}
162
Marc Zyngierae731f82010-03-15 22:56:33 +0000163static inline int __must_check
164request_any_context_irq(unsigned int irq, irq_handler_t handler,
165 unsigned long flags, const char *name, void *dev_id)
166{
167 return request_irq(irq, handler, flags, name, dev_id);
168}
169
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100170static inline int __must_check
171request_percpu_irq(unsigned int irq, irq_handler_t handler,
172 const char *devname, void __percpu *percpu_dev_id)
173{
174 return request_irq(irq, handler, 0, devname, percpu_dev_id);
175}
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100176#endif
177
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178extern void free_irq(unsigned int, void *);
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100179extern void free_percpu_irq(unsigned int, void __percpu *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Al Viro0af36782007-07-27 14:24:33 +0100181struct device;
182
Arjan van de Ven935bd5b2009-03-23 18:28:16 +0100183extern int __must_check
184devm_request_threaded_irq(struct device *dev, unsigned int irq,
185 irq_handler_t handler, irq_handler_t thread_fn,
186 unsigned long irqflags, const char *devname,
187 void *dev_id);
188
189static inline int __must_check
190devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
191 unsigned long irqflags, const char *devname, void *dev_id)
192{
193 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
194 devname, dev_id);
195}
196
Tejun Heo9ac78492007-01-20 16:00:26 +0900197extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
198
Ingo Molnard7e96292006-07-03 00:24:27 -0700199/*
200 * On lockdep we dont want to enable hardirqs in hardirq
201 * context. Use local_irq_enable_in_hardirq() to annotate
202 * kernel code that has to do this nevertheless (pretty much
203 * the only valid case is for old/broken hardware that is
204 * insanely slow).
205 *
206 * NOTE: in theory this might break fragile code that relies
207 * on hardirq delivery - in practice we dont seem to have such
208 * places left. So the only effect should be slightly increased
209 * irqs-off latencies.
210 */
211#ifdef CONFIG_LOCKDEP
212# define local_irq_enable_in_hardirq() do { } while (0)
213#else
214# define local_irq_enable_in_hardirq() local_irq_enable()
215#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217extern void disable_irq_nosync(unsigned int irq);
218extern void disable_irq(unsigned int irq);
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100219extern void disable_percpu_irq(unsigned int irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220extern void enable_irq(unsigned int irq);
Marc Zyngier1e7c5fd2011-09-30 10:48:47 +0100221extern void enable_percpu_irq(unsigned int irq, unsigned int type);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700222
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100223/* The following three functions are for the core kernel use only. */
Heiko Carstens5818a6e2009-06-11 21:59:21 +0200224#ifdef CONFIG_GENERIC_HARDIRQS
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100225extern void suspend_device_irqs(void);
226extern void resume_device_irqs(void);
227#ifdef CONFIG_PM_SLEEP
228extern int check_wakeup_irqs(void);
229#else
230static inline int check_wakeup_irqs(void) { return 0; }
231#endif
Heiko Carstens5818a6e2009-06-11 21:59:21 +0200232#else
233static inline void suspend_device_irqs(void) { };
234static inline void resume_device_irqs(void) { };
235static inline int check_wakeup_irqs(void) { return 0; }
236#endif
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100237
Russell Kingd7b90682008-04-17 07:46:24 +0200238#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
239
Rusty Russelld036e672009-01-01 10:12:26 +1030240extern cpumask_var_t irq_default_affinity;
Max Krasnyansky18404752008-05-29 11:02:52 -0700241
Rusty Russell0de26522008-12-13 21:20:26 +1030242extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
Russell Kingd7b90682008-04-17 07:46:24 +0200243extern int irq_can_set_affinity(unsigned int irq);
Max Krasnyansky18404752008-05-29 11:02:52 -0700244extern int irq_select_affinity(unsigned int irq);
Russell Kingd7b90682008-04-17 07:46:24 +0200245
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700246extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000247
248/**
249 * struct irq_affinity_notify - context for notification of IRQ affinity changes
250 * @irq: Interrupt to which notification applies
251 * @kref: Reference count, for internal use
252 * @work: Work item, for internal use
253 * @notify: Function to be called on change. This will be
254 * called in process context.
255 * @release: Function to be called on release. This will be
256 * called in process context. Once registered, the
257 * structure must only be freed when this function is
258 * called or later.
259 */
260struct irq_affinity_notify {
261 unsigned int irq;
262 struct kref kref;
263 struct work_struct work;
264 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
265 void (*release)(struct kref *ref);
266};
267
268extern int
269irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
270
271static inline void irq_run_affinity_notifiers(void)
272{
273 flush_scheduled_work();
274}
275
Russell Kingd7b90682008-04-17 07:46:24 +0200276#else /* CONFIG_SMP */
277
Rusty Russell0de26522008-12-13 21:20:26 +1030278static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
Russell Kingd7b90682008-04-17 07:46:24 +0200279{
280 return -EINVAL;
281}
282
283static inline int irq_can_set_affinity(unsigned int irq)
284{
285 return 0;
286}
287
Max Krasnyansky18404752008-05-29 11:02:52 -0700288static inline int irq_select_affinity(unsigned int irq) { return 0; }
289
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700290static inline int irq_set_affinity_hint(unsigned int irq,
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000291 const struct cpumask *m)
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700292{
293 return -EINVAL;
294}
Russell Kingd7b90682008-04-17 07:46:24 +0200295#endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
296
Al Viroe9ed7e72007-07-21 23:29:12 +0100297#ifdef CONFIG_GENERIC_HARDIRQS
Ingo Molnarc01d4032006-07-03 00:24:27 -0700298/*
299 * Special lockdep variants of irq disabling/enabling.
300 * These should be used for locking constructs that
301 * know that a particular irq context which is disabled,
302 * and which is the only irq-context user of a lock,
303 * that it's safe to take the lock in the irq-disabled
304 * section without disabling hardirqs.
305 *
306 * On !CONFIG_LOCKDEP they are equivalent to the normal
307 * irq disable/enable methods.
308 */
309static inline void disable_irq_nosync_lockdep(unsigned int irq)
310{
311 disable_irq_nosync(irq);
312#ifdef CONFIG_LOCKDEP
313 local_irq_disable();
314#endif
315}
316
Arjan van de Vene8106b92006-09-29 02:01:08 -0700317static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
318{
319 disable_irq_nosync(irq);
320#ifdef CONFIG_LOCKDEP
321 local_irq_save(*flags);
322#endif
323}
324
Ingo Molnarc01d4032006-07-03 00:24:27 -0700325static inline void disable_irq_lockdep(unsigned int irq)
326{
327 disable_irq(irq);
328#ifdef CONFIG_LOCKDEP
329 local_irq_disable();
330#endif
331}
332
333static inline void enable_irq_lockdep(unsigned int irq)
334{
335#ifdef CONFIG_LOCKDEP
336 local_irq_enable();
337#endif
338 enable_irq(irq);
339}
340
Arjan van de Vene8106b92006-09-29 02:01:08 -0700341static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
342{
343#ifdef CONFIG_LOCKDEP
344 local_irq_restore(*flags);
345#endif
346 enable_irq(irq);
347}
348
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700349/* IRQ wakeup (PM) control: */
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100350extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
351
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700352static inline int enable_irq_wake(unsigned int irq)
353{
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100354 return irq_set_irq_wake(irq, 1);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700355}
356
357static inline int disable_irq_wake(unsigned int irq)
358{
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100359 return irq_set_irq_wake(irq, 0);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700360}
361
Ingo Molnarc01d4032006-07-03 00:24:27 -0700362#else /* !CONFIG_GENERIC_HARDIRQS */
363/*
364 * NOTE: non-genirq architectures, if they want to support the lock
365 * validator need to define the methods below in their asm/irq.h
366 * files, under an #ifdef CONFIG_LOCKDEP section.
367 */
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200368#ifndef CONFIG_LOCKDEP
Ingo Molnarc01d4032006-07-03 00:24:27 -0700369# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200370# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
371 disable_irq_nosync(irq)
Ingo Molnarc01d4032006-07-03 00:24:27 -0700372# define disable_irq_lockdep(irq) disable_irq(irq)
373# define enable_irq_lockdep(irq) enable_irq(irq)
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200374# define enable_irq_lockdep_irqrestore(irq, flags) \
375 enable_irq(irq)
Ingo Molnarc01d4032006-07-03 00:24:27 -0700376# endif
377
Guennadi Liakhovetskiaa5346a2007-10-16 01:24:01 -0700378static inline int enable_irq_wake(unsigned int irq)
379{
380 return 0;
381}
382
383static inline int disable_irq_wake(unsigned int irq)
384{
385 return 0;
386}
Ingo Molnarc01d4032006-07-03 00:24:27 -0700387#endif /* CONFIG_GENERIC_HARDIRQS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000389
390#ifdef CONFIG_IRQ_FORCED_THREADING
391extern bool force_irqthreads;
392#else
393#define force_irqthreads (0)
394#endif
395
Andi Kleen3f744782005-09-12 18:49:24 +0200396#ifndef __ARCH_SET_SOFTIRQ_PENDING
397#define set_softirq_pending(x) (local_softirq_pending() = (x))
398#define or_softirq_pending(x) (local_softirq_pending() |= (x))
399#endif
400
Benjamin Herrenschmidt2d3fbbb2007-05-10 22:22:46 -0700401/* Some architectures might implement lazy enabling/disabling of
402 * interrupts. In some cases, such as stop_machine, we might want
403 * to ensure that after a local_irq_disable(), interrupts have
404 * really been disabled in hardware. Such architectures need to
405 * implement the following hook.
406 */
407#ifndef hard_irq_disable
408#define hard_irq_disable() do { } while(0)
409#endif
410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
412 frequency threaded job scheduling. For almost all the purposes
413 tasklets are more than enough. F.e. all serial device BHs et
414 al. should be converted to tasklets, not to softirqs.
415 */
416
417enum
418{
419 HI_SOFTIRQ=0,
420 TIMER_SOFTIRQ,
421 NET_TX_SOFTIRQ,
422 NET_RX_SOFTIRQ,
Jens Axboeff856ba2006-01-09 16:02:34 +0100423 BLOCK_SOFTIRQ,
Jens Axboe5e605b62009-08-05 09:07:21 +0200424 BLOCK_IOPOLL_SOFTIRQ,
Christoph Lameterc9819f42006-12-10 02:20:25 -0800425 TASKLET_SOFTIRQ,
426 SCHED_SOFTIRQ,
Peter Zijlstraa6037b62009-01-05 11:28:22 +0100427 HRTIMER_SOFTIRQ,
Shaohua Li09223372011-06-14 13:26:25 +0800428 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
Alexey Dobriyan978b0112008-09-06 20:04:36 +0200429
430 NR_SOFTIRQS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431};
432
Jason Baron5d592b42009-03-12 14:33:36 -0400433/* map softirq index to softirq name. update 'softirq_to_name' in
434 * kernel/softirq.c when adding a new softirq.
435 */
436extern char *softirq_to_name[NR_SOFTIRQS];
437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438/* softirq mask and active fields moved to irq_cpustat_t in
439 * asm/hardirq.h to get better cache usage. KAO
440 */
441
442struct softirq_action
443{
444 void (*action)(struct softirq_action *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445};
446
447asmlinkage void do_softirq(void);
Adrian Bunkeb0f1c42008-04-29 00:59:12 -0700448asmlinkage void __do_softirq(void);
Carlos R. Mafra962cf362008-05-15 11:15:37 -0300449extern void open_softirq(int nr, void (*action)(struct softirq_action *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450extern void softirq_init(void);
Steven Rostedtf0696862012-01-25 20:18:55 -0500451extern void __raise_softirq_irqoff(unsigned int nr);
Lai Jiangshan2bf21602010-08-23 18:42:48 +0900452
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800453extern void raise_softirq_irqoff(unsigned int nr);
454extern void raise_softirq(unsigned int nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
David S. Miller54514a72008-09-23 22:15:57 -0700456/* This is the worklist that queues up per-cpu softirq work.
457 *
458 * send_remote_sendirq() adds work to these lists, and
459 * the softirq handler itself dequeues from them. The queues
460 * are protected by disabling local cpu interrupts and they must
461 * only be accessed by the local cpu that they are for.
462 */
463DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
464
Venkatesh Pallipadi4dd53d82010-12-21 17:09:00 -0800465DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
466
467static inline struct task_struct *this_cpu_ksoftirqd(void)
468{
469 return this_cpu_read(ksoftirqd);
470}
471
David S. Miller54514a72008-09-23 22:15:57 -0700472/* Try to send a softirq to a remote cpu. If this cannot be done, the
473 * work will be queued to the local cpu.
474 */
475extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
476
477/* Like send_remote_softirq(), but the caller must disable local cpu interrupts
478 * and compute the current cpu, passed in as 'this_cpu'.
479 */
480extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
481 int this_cpu, int softirq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483/* Tasklets --- multithreaded analogue of BHs.
484
485 Main feature differing them of generic softirqs: tasklet
486 is running only on one CPU simultaneously.
487
488 Main feature differing them of BHs: different tasklets
489 may be run simultaneously on different CPUs.
490
491 Properties:
492 * If tasklet_schedule() is called, then tasklet is guaranteed
493 to be executed on some cpu at least once after this.
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300494 * If the tasklet is already scheduled, but its execution is still not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 started, it will be executed only once.
496 * If this tasklet is already running on another CPU (or schedule is called
497 from tasklet itself), it is rescheduled for later.
498 * Tasklet is strictly serialized wrt itself, but not
499 wrt another tasklets. If client needs some intertask synchronization,
500 he makes it with spinlocks.
501 */
502
503struct tasklet_struct
504{
505 struct tasklet_struct *next;
506 unsigned long state;
507 atomic_t count;
508 void (*func)(unsigned long);
509 unsigned long data;
510};
511
512#define DECLARE_TASKLET(name, func, data) \
513struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
514
515#define DECLARE_TASKLET_DISABLED(name, func, data) \
516struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
517
518
519enum
520{
521 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
522 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
523};
524
525#ifdef CONFIG_SMP
526static inline int tasklet_trylock(struct tasklet_struct *t)
527{
528 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
529}
530
531static inline void tasklet_unlock(struct tasklet_struct *t)
532{
533 smp_mb__before_clear_bit();
534 clear_bit(TASKLET_STATE_RUN, &(t)->state);
535}
536
537static inline void tasklet_unlock_wait(struct tasklet_struct *t)
538{
539 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
540}
541#else
542#define tasklet_trylock(t) 1
543#define tasklet_unlock_wait(t) do { } while (0)
544#define tasklet_unlock(t) do { } while (0)
545#endif
546
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800547extern void __tasklet_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
549static inline void tasklet_schedule(struct tasklet_struct *t)
550{
551 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
552 __tasklet_schedule(t);
553}
554
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800555extern void __tasklet_hi_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557static inline void tasklet_hi_schedule(struct tasklet_struct *t)
558{
559 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
560 __tasklet_hi_schedule(t);
561}
562
Vegard Nossum7c692cb2008-05-21 22:53:13 +0200563extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
564
565/*
566 * This version avoids touching any other tasklets. Needed for kmemcheck
567 * in order not to take any page faults while enqueueing this tasklet;
568 * consider VERY carefully whether you really need this or
569 * tasklet_hi_schedule()...
570 */
571static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
572{
573 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
574 __tasklet_hi_schedule_first(t);
575}
576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578static inline void tasklet_disable_nosync(struct tasklet_struct *t)
579{
580 atomic_inc(&t->count);
581 smp_mb__after_atomic_inc();
582}
583
584static inline void tasklet_disable(struct tasklet_struct *t)
585{
586 tasklet_disable_nosync(t);
587 tasklet_unlock_wait(t);
588 smp_mb();
589}
590
591static inline void tasklet_enable(struct tasklet_struct *t)
592{
593 smp_mb__before_atomic_dec();
594 atomic_dec(&t->count);
595}
596
597static inline void tasklet_hi_enable(struct tasklet_struct *t)
598{
599 smp_mb__before_atomic_dec();
600 atomic_dec(&t->count);
601}
602
603extern void tasklet_kill(struct tasklet_struct *t);
604extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
605extern void tasklet_init(struct tasklet_struct *t,
606 void (*func)(unsigned long), unsigned long data);
607
Peter Zijlstra9ba5f002009-07-22 14:18:35 +0200608struct tasklet_hrtimer {
609 struct hrtimer timer;
610 struct tasklet_struct tasklet;
611 enum hrtimer_restart (*function)(struct hrtimer *);
612};
613
614extern void
615tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
616 enum hrtimer_restart (*function)(struct hrtimer *),
617 clockid_t which_clock, enum hrtimer_mode mode);
618
619static inline
620int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
621 const enum hrtimer_mode mode)
622{
623 return hrtimer_start(&ttimer->timer, time, mode);
624}
625
626static inline
627void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
628{
629 hrtimer_cancel(&ttimer->timer);
630 tasklet_kill(&ttimer->tasklet);
631}
632
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633/*
634 * Autoprobing for irqs:
635 *
636 * probe_irq_on() and probe_irq_off() provide robust primitives
637 * for accurate IRQ probing during kernel initialization. They are
638 * reasonably simple to use, are not "fooled" by spurious interrupts,
639 * and, unlike other attempts at IRQ probing, they do not get hung on
640 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
641 *
642 * For reasonably foolproof probing, use them as follows:
643 *
644 * 1. clear and/or mask the device's internal interrupt.
645 * 2. sti();
646 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
647 * 4. enable the device and cause it to trigger an interrupt.
648 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
649 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
650 * 7. service the device to clear its pending interrupt.
651 * 8. loop again if paranoia is required.
652 *
653 * probe_irq_on() returns a mask of allocated irq's.
654 *
655 * probe_irq_off() takes the mask as a parameter,
656 * and returns the irq number which occurred,
657 * or zero if none occurred, or a negative irq number
658 * if more than one irq occurred.
659 */
660
661#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
662static inline unsigned long probe_irq_on(void)
663{
664 return 0;
665}
666static inline int probe_irq_off(unsigned long val)
667{
668 return 0;
669}
670static inline unsigned int probe_irq_mask(unsigned long val)
671{
672 return 0;
673}
674#else
675extern unsigned long probe_irq_on(void); /* returns 0 on failure */
676extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
677extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
678#endif
679
Andrew Morton6168a702007-02-17 21:22:39 -0800680#ifdef CONFIG_PROC_FS
681/* Initialize /proc/irq/ */
682extern void init_irq_proc(void);
683#else
684static inline void init_irq_proc(void)
685{
686}
687#endif
688
Alexey Dobriyand43c36d2009-10-07 17:09:06 +0400689struct seq_file;
Adrian Bunkf74596d2008-02-06 01:36:35 -0800690int show_interrupts(struct seq_file *p, void *v);
Thomas Gleixnerc78b9b62010-12-16 17:21:47 +0100691int arch_show_interrupts(struct seq_file *p, int prec);
Adrian Bunkf74596d2008-02-06 01:36:35 -0800692
Yinghai Lu43a25632008-12-28 16:01:13 -0800693extern int early_irq_init(void);
Yinghai Lu4a046d12009-01-12 17:39:24 -0800694extern int arch_probe_nr_irqs(void);
Yinghai Lu43a25632008-12-28 16:01:13 -0800695extern int arch_early_irq_init(void);
Yinghai Lu43a25632008-12-28 16:01:13 -0800696
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697#endif