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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <asm/atomic.h>
21#include <asm/ptrace.h>
22#include <asm/system.h>
Lai Jiangshan2bf21602010-08-23 18:42:48 +090023#include <trace/events/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Thomas Gleixner6e213612006-07-01 19:29:03 -070025/*
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 *
Thomas Gleixner6932bf32010-03-26 00:06:55 +000045 * IRQF_DISABLED - keep irqs disabled when calling the action handler.
46 * DEPRECATED. This flag is a NOOP and scheduled to be removed
Thomas Gleixner6e213612006-07-01 19:29:03 -070047 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
48 * IRQF_SHARED - allow sharing the irq among several devices
49 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
50 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
Thomas Gleixner950f4422007-02-16 01:27:24 -080051 * IRQF_PERCPU - Interrupt is per cpu
52 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
Bernhard Walled85a60d2007-05-08 00:35:24 -070053 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
54 * registered first in an shared interrupt is considered for
55 * performance reasons)
Thomas Gleixnerb25c3402009-08-13 12:17:22 +020056 * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
57 * Used by threaded interrupts which need to keep the
58 * irq line disabled until the threaded handler has been run.
Ian Campbell685fd0b2010-07-29 11:16:32 +010059 * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend
Thomas Gleixnerdc5f2192011-02-04 13:19:20 +010060 * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
Thomas Gleixner0c4602f2011-02-23 23:52:18 +000061 * IRQF_NO_THREAD - Interrupt cannot be threaded
Thomas Gleixner6e213612006-07-01 19:29:03 -070062 */
63#define IRQF_DISABLED 0x00000020
64#define IRQF_SAMPLE_RANDOM 0x00000040
65#define IRQF_SHARED 0x00000080
66#define IRQF_PROBE_SHARED 0x00000100
Ian Campbell685fd0b2010-07-29 11:16:32 +010067#define __IRQF_TIMER 0x00000200
Thomas Gleixner284c6682006-07-03 02:20:32 +020068#define IRQF_PERCPU 0x00000400
Thomas Gleixner950f4422007-02-16 01:27:24 -080069#define IRQF_NOBALANCING 0x00000800
Bernhard Walled85a60d2007-05-08 00:35:24 -070070#define IRQF_IRQPOLL 0x00001000
Thomas Gleixnerb25c3402009-08-13 12:17:22 +020071#define IRQF_ONESHOT 0x00002000
Ian Campbell685fd0b2010-07-29 11:16:32 +010072#define IRQF_NO_SUSPEND 0x00004000
Thomas Gleixnerdc5f2192011-02-04 13:19:20 +010073#define IRQF_FORCE_RESUME 0x00008000
Thomas Gleixner0c4602f2011-02-23 23:52:18 +000074#define IRQF_NO_THREAD 0x00010000
Ian Campbell685fd0b2010-07-29 11:16:32 +010075
Thomas Gleixner0c4602f2011-02-23 23:52:18 +000076#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
Thomas Gleixner6e213612006-07-01 19:29:03 -070077
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010078/*
Marc Zyngierae731f82010-03-15 22:56:33 +000079 * These values can be returned by request_any_context_irq() and
80 * describe the context the interrupt will be run in.
81 *
82 * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
83 * IRQC_IS_NESTED - interrupt runs in a nested threaded context
84 */
85enum {
86 IRQC_IS_HARDIRQ = 0,
87 IRQC_IS_NESTED,
88};
89
David Howells7d12e782006-10-05 14:55:46 +010090typedef irqreturn_t (*irq_handler_t)(int, void *);
David Howellsda482792006-10-05 13:06:34 +010091
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010092/**
93 * struct irqaction - per interrupt action descriptor
94 * @handler: interrupt handler function
95 * @flags: flags (see IRQF_* above)
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010096 * @name: name of the device
97 * @dev_id: cookie to identify the device
98 * @next: pointer to the next irqaction for shared interrupts
99 * @irq: interrupt number
100 * @dir: pointer to the proc/irq/NN/name entry
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100101 * @thread_fn: interupt handler function for threaded interrupts
102 * @thread: thread pointer for threaded interrupts
103 * @thread_flags: flags related to @thread
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000104 * @thread_mask: bitmask for keeping track of @thread activity
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +0100105 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106struct irqaction {
David Howellsda482792006-10-05 13:06:34 +0100107 irq_handler_t handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 void *dev_id;
110 struct irqaction *next;
111 int irq;
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100112 irq_handler_t thread_fn;
113 struct task_struct *thread;
114 unsigned long thread_flags;
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000115 unsigned long thread_mask;
Eric Dumazetf6cd2472010-11-04 11:13:48 +0100116 const char *name;
117 struct proc_dir_entry *dir;
118} ____cacheline_internodealigned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
David Howells7d12e782006-10-05 14:55:46 +0100120extern irqreturn_t no_action(int cpl, void *dev_id);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100121
Thomas Gleixner3a381482009-03-24 20:27:39 +0100122#ifdef CONFIG_GENERIC_HARDIRQS
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100123extern int __must_check
124request_threaded_irq(unsigned int irq, irq_handler_t handler,
125 irq_handler_t thread_fn,
126 unsigned long flags, const char *name, void *dev);
127
128static inline int __must_check
129request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
130 const char *name, void *dev)
131{
132 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
133}
134
Marc Zyngierae731f82010-03-15 22:56:33 +0000135extern int __must_check
136request_any_context_irq(unsigned int irq, irq_handler_t handler,
137 unsigned long flags, const char *name, void *dev_id);
138
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100139extern void exit_irq_thread(void);
140#else
Thomas Gleixner3a381482009-03-24 20:27:39 +0100141
142extern int __must_check
143request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
144 const char *name, void *dev);
145
Thomas Gleixnerde188362009-03-25 17:33:38 +0100146/*
147 * Special function to avoid ifdeffery in kernel/irq/devres.c which
148 * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
149 * m68k). I really love these $@%#!* obvious Makefile references:
150 * ../../../kernel/irq/devres.o
151 */
152static inline int __must_check
153request_threaded_irq(unsigned int irq, irq_handler_t handler,
154 irq_handler_t thread_fn,
155 unsigned long flags, const char *name, void *dev)
156{
157 return request_irq(irq, handler, flags, name, dev);
158}
159
Marc Zyngierae731f82010-03-15 22:56:33 +0000160static inline int __must_check
161request_any_context_irq(unsigned int irq, irq_handler_t handler,
162 unsigned long flags, const char *name, void *dev_id)
163{
164 return request_irq(irq, handler, flags, name, dev_id);
165}
166
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100167static inline void exit_irq_thread(void) { }
168#endif
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170extern void free_irq(unsigned int, void *);
171
Al Viro0af36782007-07-27 14:24:33 +0100172struct device;
173
Arjan van de Ven935bd5b2009-03-23 18:28:16 +0100174extern int __must_check
175devm_request_threaded_irq(struct device *dev, unsigned int irq,
176 irq_handler_t handler, irq_handler_t thread_fn,
177 unsigned long irqflags, const char *devname,
178 void *dev_id);
179
180static inline int __must_check
181devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
182 unsigned long irqflags, const char *devname, void *dev_id)
183{
184 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
185 devname, dev_id);
186}
187
Tejun Heo9ac78492007-01-20 16:00:26 +0900188extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
189
Ingo Molnard7e96292006-07-03 00:24:27 -0700190/*
191 * On lockdep we dont want to enable hardirqs in hardirq
192 * context. Use local_irq_enable_in_hardirq() to annotate
193 * kernel code that has to do this nevertheless (pretty much
194 * the only valid case is for old/broken hardware that is
195 * insanely slow).
196 *
197 * NOTE: in theory this might break fragile code that relies
198 * on hardirq delivery - in practice we dont seem to have such
199 * places left. So the only effect should be slightly increased
200 * irqs-off latencies.
201 */
202#ifdef CONFIG_LOCKDEP
203# define local_irq_enable_in_hardirq() do { } while (0)
204#else
205# define local_irq_enable_in_hardirq() local_irq_enable()
206#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208extern void disable_irq_nosync(unsigned int irq);
209extern void disable_irq(unsigned int irq);
210extern void enable_irq(unsigned int irq);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700211
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100212/* The following three functions are for the core kernel use only. */
Heiko Carstens5818a6e2009-06-11 21:59:21 +0200213#ifdef CONFIG_GENERIC_HARDIRQS
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100214extern void suspend_device_irqs(void);
215extern void resume_device_irqs(void);
216#ifdef CONFIG_PM_SLEEP
217extern int check_wakeup_irqs(void);
218#else
219static inline int check_wakeup_irqs(void) { return 0; }
220#endif
Heiko Carstens5818a6e2009-06-11 21:59:21 +0200221#else
222static inline void suspend_device_irqs(void) { };
223static inline void resume_device_irqs(void) { };
224static inline int check_wakeup_irqs(void) { return 0; }
225#endif
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100226
Russell Kingd7b90682008-04-17 07:46:24 +0200227#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
228
Rusty Russelld036e672009-01-01 10:12:26 +1030229extern cpumask_var_t irq_default_affinity;
Max Krasnyansky18404752008-05-29 11:02:52 -0700230
Rusty Russell0de26522008-12-13 21:20:26 +1030231extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
Russell Kingd7b90682008-04-17 07:46:24 +0200232extern int irq_can_set_affinity(unsigned int irq);
Max Krasnyansky18404752008-05-29 11:02:52 -0700233extern int irq_select_affinity(unsigned int irq);
Russell Kingd7b90682008-04-17 07:46:24 +0200234
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700235extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000236
237/**
238 * struct irq_affinity_notify - context for notification of IRQ affinity changes
239 * @irq: Interrupt to which notification applies
240 * @kref: Reference count, for internal use
241 * @work: Work item, for internal use
242 * @notify: Function to be called on change. This will be
243 * called in process context.
244 * @release: Function to be called on release. This will be
245 * called in process context. Once registered, the
246 * structure must only be freed when this function is
247 * called or later.
248 */
249struct irq_affinity_notify {
250 unsigned int irq;
251 struct kref kref;
252 struct work_struct work;
253 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
254 void (*release)(struct kref *ref);
255};
256
257extern int
258irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
259
260static inline void irq_run_affinity_notifiers(void)
261{
262 flush_scheduled_work();
263}
264
Russell Kingd7b90682008-04-17 07:46:24 +0200265#else /* CONFIG_SMP */
266
Rusty Russell0de26522008-12-13 21:20:26 +1030267static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
Russell Kingd7b90682008-04-17 07:46:24 +0200268{
269 return -EINVAL;
270}
271
272static inline int irq_can_set_affinity(unsigned int irq)
273{
274 return 0;
275}
276
Max Krasnyansky18404752008-05-29 11:02:52 -0700277static inline int irq_select_affinity(unsigned int irq) { return 0; }
278
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700279static inline int irq_set_affinity_hint(unsigned int irq,
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000280 const struct cpumask *m)
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700281{
282 return -EINVAL;
283}
Russell Kingd7b90682008-04-17 07:46:24 +0200284#endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
285
Al Viroe9ed7e72007-07-21 23:29:12 +0100286#ifdef CONFIG_GENERIC_HARDIRQS
Ingo Molnarc01d4032006-07-03 00:24:27 -0700287/*
288 * Special lockdep variants of irq disabling/enabling.
289 * These should be used for locking constructs that
290 * know that a particular irq context which is disabled,
291 * and which is the only irq-context user of a lock,
292 * that it's safe to take the lock in the irq-disabled
293 * section without disabling hardirqs.
294 *
295 * On !CONFIG_LOCKDEP they are equivalent to the normal
296 * irq disable/enable methods.
297 */
298static inline void disable_irq_nosync_lockdep(unsigned int irq)
299{
300 disable_irq_nosync(irq);
301#ifdef CONFIG_LOCKDEP
302 local_irq_disable();
303#endif
304}
305
Arjan van de Vene8106b92006-09-29 02:01:08 -0700306static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
307{
308 disable_irq_nosync(irq);
309#ifdef CONFIG_LOCKDEP
310 local_irq_save(*flags);
311#endif
312}
313
Ingo Molnarc01d4032006-07-03 00:24:27 -0700314static inline void disable_irq_lockdep(unsigned int irq)
315{
316 disable_irq(irq);
317#ifdef CONFIG_LOCKDEP
318 local_irq_disable();
319#endif
320}
321
322static inline void enable_irq_lockdep(unsigned int irq)
323{
324#ifdef CONFIG_LOCKDEP
325 local_irq_enable();
326#endif
327 enable_irq(irq);
328}
329
Arjan van de Vene8106b92006-09-29 02:01:08 -0700330static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
331{
332#ifdef CONFIG_LOCKDEP
333 local_irq_restore(*flags);
334#endif
335 enable_irq(irq);
336}
337
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700338/* IRQ wakeup (PM) control: */
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100339extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
340
341#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
342/* Please do not use: Use the replacement functions instead */
343static inline int set_irq_wake(unsigned int irq, unsigned int on)
344{
345 return irq_set_irq_wake(irq, on);
346}
347#endif
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700348
349static inline int enable_irq_wake(unsigned int irq)
350{
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100351 return irq_set_irq_wake(irq, 1);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700352}
353
354static inline int disable_irq_wake(unsigned int irq)
355{
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100356 return irq_set_irq_wake(irq, 0);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700357}
358
Ingo Molnarc01d4032006-07-03 00:24:27 -0700359#else /* !CONFIG_GENERIC_HARDIRQS */
360/*
361 * NOTE: non-genirq architectures, if they want to support the lock
362 * validator need to define the methods below in their asm/irq.h
363 * files, under an #ifdef CONFIG_LOCKDEP section.
364 */
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200365#ifndef CONFIG_LOCKDEP
Ingo Molnarc01d4032006-07-03 00:24:27 -0700366# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200367# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
368 disable_irq_nosync(irq)
Ingo Molnarc01d4032006-07-03 00:24:27 -0700369# define disable_irq_lockdep(irq) disable_irq(irq)
370# define enable_irq_lockdep(irq) enable_irq(irq)
Roman Zippelb3e2fd92007-05-01 22:32:42 +0200371# define enable_irq_lockdep_irqrestore(irq, flags) \
372 enable_irq(irq)
Ingo Molnarc01d4032006-07-03 00:24:27 -0700373# endif
374
Guennadi Liakhovetskiaa5346a2007-10-16 01:24:01 -0700375static inline int enable_irq_wake(unsigned int irq)
376{
377 return 0;
378}
379
380static inline int disable_irq_wake(unsigned int irq)
381{
382 return 0;
383}
Ingo Molnarc01d4032006-07-03 00:24:27 -0700384#endif /* CONFIG_GENERIC_HARDIRQS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000386
387#ifdef CONFIG_IRQ_FORCED_THREADING
388extern bool force_irqthreads;
389#else
390#define force_irqthreads (0)
391#endif
392
Andi Kleen3f744782005-09-12 18:49:24 +0200393#ifndef __ARCH_SET_SOFTIRQ_PENDING
394#define set_softirq_pending(x) (local_softirq_pending() = (x))
395#define or_softirq_pending(x) (local_softirq_pending() |= (x))
396#endif
397
Benjamin Herrenschmidt2d3fbbb2007-05-10 22:22:46 -0700398/* Some architectures might implement lazy enabling/disabling of
399 * interrupts. In some cases, such as stop_machine, we might want
400 * to ensure that after a local_irq_disable(), interrupts have
401 * really been disabled in hardware. Such architectures need to
402 * implement the following hook.
403 */
404#ifndef hard_irq_disable
405#define hard_irq_disable() do { } while(0)
406#endif
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
409 frequency threaded job scheduling. For almost all the purposes
410 tasklets are more than enough. F.e. all serial device BHs et
411 al. should be converted to tasklets, not to softirqs.
412 */
413
414enum
415{
416 HI_SOFTIRQ=0,
417 TIMER_SOFTIRQ,
418 NET_TX_SOFTIRQ,
419 NET_RX_SOFTIRQ,
Jens Axboeff856ba2006-01-09 16:02:34 +0100420 BLOCK_SOFTIRQ,
Jens Axboe5e605b62009-08-05 09:07:21 +0200421 BLOCK_IOPOLL_SOFTIRQ,
Christoph Lameterc9819f42006-12-10 02:20:25 -0800422 TASKLET_SOFTIRQ,
423 SCHED_SOFTIRQ,
Peter Zijlstraa6037b62009-01-05 11:28:22 +0100424 HRTIMER_SOFTIRQ,
425 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
Alexey Dobriyan978b0112008-09-06 20:04:36 +0200426
427 NR_SOFTIRQS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428};
429
Jason Baron5d592b42009-03-12 14:33:36 -0400430/* map softirq index to softirq name. update 'softirq_to_name' in
431 * kernel/softirq.c when adding a new softirq.
432 */
433extern char *softirq_to_name[NR_SOFTIRQS];
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435/* softirq mask and active fields moved to irq_cpustat_t in
436 * asm/hardirq.h to get better cache usage. KAO
437 */
438
439struct softirq_action
440{
441 void (*action)(struct softirq_action *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442};
443
444asmlinkage void do_softirq(void);
Adrian Bunkeb0f1c42008-04-29 00:59:12 -0700445asmlinkage void __do_softirq(void);
Carlos R. Mafra962cf362008-05-15 11:15:37 -0300446extern void open_softirq(int nr, void (*action)(struct softirq_action *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447extern void softirq_init(void);
Lai Jiangshan2bf21602010-08-23 18:42:48 +0900448static inline void __raise_softirq_irqoff(unsigned int nr)
449{
Thomas Gleixnerf4bc6bb2010-10-19 15:00:13 +0200450 trace_softirq_raise(nr);
Lai Jiangshan2bf21602010-08-23 18:42:48 +0900451 or_softirq_pending(1UL << nr);
452}
453
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800454extern void raise_softirq_irqoff(unsigned int nr);
455extern void raise_softirq(unsigned int nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
David S. Miller54514a72008-09-23 22:15:57 -0700457/* This is the worklist that queues up per-cpu softirq work.
458 *
459 * send_remote_sendirq() adds work to these lists, and
460 * the softirq handler itself dequeues from them. The queues
461 * are protected by disabling local cpu interrupts and they must
462 * only be accessed by the local cpu that they are for.
463 */
464DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
465
466/* Try to send a softirq to a remote cpu. If this cannot be done, the
467 * work will be queued to the local cpu.
468 */
469extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
470
471/* Like send_remote_softirq(), but the caller must disable local cpu interrupts
472 * and compute the current cpu, passed in as 'this_cpu'.
473 */
474extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
475 int this_cpu, int softirq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477/* Tasklets --- multithreaded analogue of BHs.
478
479 Main feature differing them of generic softirqs: tasklet
480 is running only on one CPU simultaneously.
481
482 Main feature differing them of BHs: different tasklets
483 may be run simultaneously on different CPUs.
484
485 Properties:
486 * If tasklet_schedule() is called, then tasklet is guaranteed
487 to be executed on some cpu at least once after this.
488 * If the tasklet is already scheduled, but its excecution is still not
489 started, it will be executed only once.
490 * If this tasklet is already running on another CPU (or schedule is called
491 from tasklet itself), it is rescheduled for later.
492 * Tasklet is strictly serialized wrt itself, but not
493 wrt another tasklets. If client needs some intertask synchronization,
494 he makes it with spinlocks.
495 */
496
497struct tasklet_struct
498{
499 struct tasklet_struct *next;
500 unsigned long state;
501 atomic_t count;
502 void (*func)(unsigned long);
503 unsigned long data;
504};
505
506#define DECLARE_TASKLET(name, func, data) \
507struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
508
509#define DECLARE_TASKLET_DISABLED(name, func, data) \
510struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
511
512
513enum
514{
515 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
516 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
517};
518
519#ifdef CONFIG_SMP
520static inline int tasklet_trylock(struct tasklet_struct *t)
521{
522 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
523}
524
525static inline void tasklet_unlock(struct tasklet_struct *t)
526{
527 smp_mb__before_clear_bit();
528 clear_bit(TASKLET_STATE_RUN, &(t)->state);
529}
530
531static inline void tasklet_unlock_wait(struct tasklet_struct *t)
532{
533 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
534}
535#else
536#define tasklet_trylock(t) 1
537#define tasklet_unlock_wait(t) do { } while (0)
538#define tasklet_unlock(t) do { } while (0)
539#endif
540
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800541extern void __tasklet_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543static inline void tasklet_schedule(struct tasklet_struct *t)
544{
545 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
546 __tasklet_schedule(t);
547}
548
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800549extern void __tasklet_hi_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551static inline void tasklet_hi_schedule(struct tasklet_struct *t)
552{
553 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
554 __tasklet_hi_schedule(t);
555}
556
Vegard Nossum7c692cb2008-05-21 22:53:13 +0200557extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
558
559/*
560 * This version avoids touching any other tasklets. Needed for kmemcheck
561 * in order not to take any page faults while enqueueing this tasklet;
562 * consider VERY carefully whether you really need this or
563 * tasklet_hi_schedule()...
564 */
565static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
566{
567 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
568 __tasklet_hi_schedule_first(t);
569}
570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
572static inline void tasklet_disable_nosync(struct tasklet_struct *t)
573{
574 atomic_inc(&t->count);
575 smp_mb__after_atomic_inc();
576}
577
578static inline void tasklet_disable(struct tasklet_struct *t)
579{
580 tasklet_disable_nosync(t);
581 tasklet_unlock_wait(t);
582 smp_mb();
583}
584
585static inline void tasklet_enable(struct tasklet_struct *t)
586{
587 smp_mb__before_atomic_dec();
588 atomic_dec(&t->count);
589}
590
591static inline void tasklet_hi_enable(struct tasklet_struct *t)
592{
593 smp_mb__before_atomic_dec();
594 atomic_dec(&t->count);
595}
596
597extern void tasklet_kill(struct tasklet_struct *t);
598extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
599extern void tasklet_init(struct tasklet_struct *t,
600 void (*func)(unsigned long), unsigned long data);
601
Peter Zijlstra9ba5f002009-07-22 14:18:35 +0200602struct tasklet_hrtimer {
603 struct hrtimer timer;
604 struct tasklet_struct tasklet;
605 enum hrtimer_restart (*function)(struct hrtimer *);
606};
607
608extern void
609tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
610 enum hrtimer_restart (*function)(struct hrtimer *),
611 clockid_t which_clock, enum hrtimer_mode mode);
612
613static inline
614int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
615 const enum hrtimer_mode mode)
616{
617 return hrtimer_start(&ttimer->timer, time, mode);
618}
619
620static inline
621void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
622{
623 hrtimer_cancel(&ttimer->timer);
624 tasklet_kill(&ttimer->tasklet);
625}
626
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627/*
628 * Autoprobing for irqs:
629 *
630 * probe_irq_on() and probe_irq_off() provide robust primitives
631 * for accurate IRQ probing during kernel initialization. They are
632 * reasonably simple to use, are not "fooled" by spurious interrupts,
633 * and, unlike other attempts at IRQ probing, they do not get hung on
634 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
635 *
636 * For reasonably foolproof probing, use them as follows:
637 *
638 * 1. clear and/or mask the device's internal interrupt.
639 * 2. sti();
640 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
641 * 4. enable the device and cause it to trigger an interrupt.
642 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
643 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
644 * 7. service the device to clear its pending interrupt.
645 * 8. loop again if paranoia is required.
646 *
647 * probe_irq_on() returns a mask of allocated irq's.
648 *
649 * probe_irq_off() takes the mask as a parameter,
650 * and returns the irq number which occurred,
651 * or zero if none occurred, or a negative irq number
652 * if more than one irq occurred.
653 */
654
655#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
656static inline unsigned long probe_irq_on(void)
657{
658 return 0;
659}
660static inline int probe_irq_off(unsigned long val)
661{
662 return 0;
663}
664static inline unsigned int probe_irq_mask(unsigned long val)
665{
666 return 0;
667}
668#else
669extern unsigned long probe_irq_on(void); /* returns 0 on failure */
670extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
671extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
672#endif
673
Andrew Morton6168a702007-02-17 21:22:39 -0800674#ifdef CONFIG_PROC_FS
675/* Initialize /proc/irq/ */
676extern void init_irq_proc(void);
677#else
678static inline void init_irq_proc(void)
679{
680}
681#endif
682
Alexey Dobriyand43c36d2009-10-07 17:09:06 +0400683struct seq_file;
Adrian Bunkf74596d2008-02-06 01:36:35 -0800684int show_interrupts(struct seq_file *p, void *v);
Thomas Gleixnerc78b9b62010-12-16 17:21:47 +0100685int arch_show_interrupts(struct seq_file *p, int prec);
Adrian Bunkf74596d2008-02-06 01:36:35 -0800686
Yinghai Lu43a25632008-12-28 16:01:13 -0800687extern int early_irq_init(void);
Yinghai Lu4a046d12009-01-12 17:39:24 -0800688extern int arch_probe_nr_irqs(void);
Yinghai Lu43a25632008-12-28 16:01:13 -0800689extern int arch_early_irq_init(void);
Yinghai Lu43a25632008-12-28 16:01:13 -0800690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691#endif