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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>
Peter Zijlstra9ba5f002009-07-22 14:18:35 +020014#include <linux/hrtimer.h>
Ben Hutchingscd7eab42011-01-19 21:01:44 +000015#include <linux/kref.h>
16#include <linux/workqueue.h>
Ingo Molnar0ebb26e2008-12-12 11:26:39 +010017
Arun Sharma600634972011-07-26 16:09:06 -070018#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/ptrace.h>
Frederic Weisbecker7d65f4a2013-09-05 15:49:45 +020020#include <asm/irq.h>
Masami Hiramatsu229a7182017-08-03 11:38:21 +090021#include <asm/sections.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 Gleixner6e213612006-07-01 19:29:03 -070043 * IRQF_SHARED - allow sharing the irq among several devices
44 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
45 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
Thomas Gleixner950f4422007-02-16 01:27:24 -080046 * IRQF_PERCPU - Interrupt is per cpu
47 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
Bernhard Walled85a60d2007-05-08 00:35:24 -070048 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
49 * registered first in an shared interrupt is considered for
50 * performance reasons)
Thomas Gleixnerb25c3402009-08-13 12:17:22 +020051 * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
52 * Used by threaded interrupts which need to keep the
53 * irq line disabled until the threaded handler has been run.
Mark Rutland737eb032015-02-20 14:53:46 +000054 * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend. Does not guarantee
55 * that this interrupt will wake the system from a suspended
56 * state. See Documentation/power/suspend-and-interrupts.txt
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.
Rafael J. Wysocki17f48032015-02-27 00:07:55 +010061 * IRQF_COND_SUSPEND - If the IRQ is shared with a NO_SUSPEND user, execute this
62 * interrupt handler after suspending interrupts. For system
63 * wakeup devices users need to implement wakeup detection in
64 * their interrupt handlers.
Thomas Gleixner6e213612006-07-01 19:29:03 -070065 */
Thomas Gleixner6e213612006-07-01 19:29:03 -070066#define IRQF_SHARED 0x00000080
67#define IRQF_PROBE_SHARED 0x00000100
Ian Campbell685fd0b2010-07-29 11:16:32 +010068#define __IRQF_TIMER 0x00000200
Thomas Gleixner284c6682006-07-03 02:20:32 +020069#define IRQF_PERCPU 0x00000400
Thomas Gleixner950f4422007-02-16 01:27:24 -080070#define IRQF_NOBALANCING 0x00000800
Bernhard Walled85a60d2007-05-08 00:35:24 -070071#define IRQF_IRQPOLL 0x00001000
Thomas Gleixnerb25c3402009-08-13 12:17:22 +020072#define IRQF_ONESHOT 0x00002000
Ian Campbell685fd0b2010-07-29 11:16:32 +010073#define IRQF_NO_SUSPEND 0x00004000
Thomas Gleixnerdc5f2192011-02-04 13:19:20 +010074#define IRQF_FORCE_RESUME 0x00008000
Thomas Gleixner0c4602f2011-02-23 23:52:18 +000075#define IRQF_NO_THREAD 0x00010000
Ian Campbell9bab0b72011-10-03 15:37:00 +010076#define IRQF_EARLY_RESUME 0x00020000
Rafael J. Wysocki17f48032015-02-27 00:07:55 +010077#define IRQF_COND_SUSPEND 0x00040000
Ian Campbell685fd0b2010-07-29 11:16:32 +010078
Thomas Gleixner0c4602f2011-02-23 23:52:18 +000079#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010080
Randy Dunlapb4e6b092010-05-21 09:03:01 -070081/*
Marc Zyngierae731f82010-03-15 22:56:33 +000082 * These values can be returned by request_any_context_irq() and
83 * describe the context the interrupt will be run in.
84 *
85 * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
86 * IRQC_IS_NESTED - interrupt runs in a nested threaded context
87 */
88enum {
89 IRQC_IS_HARDIRQ = 0,
90 IRQC_IS_NESTED,
91};
92
David Howells7d12e782006-10-05 14:55:46 +010093typedef irqreturn_t (*irq_handler_t)(int, void *);
David Howellsda482792006-10-05 13:06:34 +010094
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010095/**
96 * struct irqaction - per interrupt action descriptor
97 * @handler: interrupt handler function
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +010098 * @name: name of the device
99 * @dev_id: cookie to identify the device
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100100 * @percpu_dev_id: cookie to identify the device
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +0100101 * @next: pointer to the next irqaction for shared interrupts
102 * @irq: interrupt number
Thomas Gleixnerc0ecaa02012-04-19 11:53:25 +0200103 * @flags: flags (see IRQF_* above)
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300104 * @thread_fn: interrupt handler function for threaded interrupts
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100105 * @thread: thread pointer for threaded interrupts
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +0200106 * @secondary: pointer to secondary irqaction (force threading)
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100107 * @thread_flags: flags related to @thread
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000108 * @thread_mask: bitmask for keeping track of @thread activity
Thomas Gleixnerc0ecaa02012-04-19 11:53:25 +0200109 * @dir: pointer to the proc/irq/NN/name entry
Thomas Gleixnera9d0a1a2009-03-03 16:58:16 +0100110 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111struct irqaction {
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100112 irq_handler_t handler;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100113 void *dev_id;
114 void __percpu *percpu_dev_id;
115 struct irqaction *next;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100116 irq_handler_t thread_fn;
117 struct task_struct *thread;
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +0200118 struct irqaction *secondary;
Thomas Gleixnerc0ecaa02012-04-19 11:53:25 +0200119 unsigned int irq;
120 unsigned int flags;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100121 unsigned long thread_flags;
122 unsigned long thread_mask;
123 const char *name;
124 struct proc_dir_entry *dir;
Eric Dumazetf6cd2472010-11-04 11:13:48 +0100125} ____cacheline_internodealigned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
David Howells7d12e782006-10-05 14:55:46 +0100127extern irqreturn_t no_action(int cpl, void *dev_id);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100128
Chen Fane237a552016-02-15 12:52:01 +0800129/*
130 * If a (PCI) device interrupt is not connected we set dev->irq to
131 * IRQ_NOTCONNECTED. This causes request_irq() to fail with -ENOTCONN, so we
132 * can distingiush that case from other error returns.
133 *
134 * 0x80000000 is guaranteed to be outside the available range of interrupts
135 * and easy to distinguish from other possible incorrect values.
136 */
137#define IRQ_NOTCONNECTED (1U << 31)
138
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100139extern 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
144static inline int __must_check
145request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
146 const char *name, void *dev)
147{
148 return request_threaded_irq(irq, handler, NULL, flags, name, dev);
149}
150
Marc Zyngierae731f82010-03-15 22:56:33 +0000151extern int __must_check
152request_any_context_irq(unsigned int irq, irq_handler_t handler,
153 unsigned long flags, const char *name, void *dev_id);
154
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100155extern int __must_check
Daniel Lezcanoc80081b2017-07-06 14:29:04 +0200156__request_percpu_irq(unsigned int irq, irq_handler_t handler,
157 unsigned long flags, const char *devname,
158 void __percpu *percpu_dev_id);
159
160static inline int __must_check
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100161request_percpu_irq(unsigned int irq, irq_handler_t handler,
Daniel Lezcanoc80081b2017-07-06 14:29:04 +0200162 const char *devname, void __percpu *percpu_dev_id)
163{
164 return __request_percpu_irq(irq, handler, 0,
165 devname, percpu_dev_id);
166}
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100167
Christoph Hellwig25ce4be2017-04-13 09:06:41 +0200168extern const void *free_irq(unsigned int, void *);
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100169extern void free_percpu_irq(unsigned int, void __percpu *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Al Viro0af36782007-07-27 14:24:33 +0100171struct device;
172
Arjan van de Ven935bd5b2009-03-23 18:28:16 +0100173extern int __must_check
174devm_request_threaded_irq(struct device *dev, unsigned int irq,
175 irq_handler_t handler, irq_handler_t thread_fn,
176 unsigned long irqflags, const char *devname,
177 void *dev_id);
178
179static inline int __must_check
180devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
181 unsigned long irqflags, const char *devname, void *dev_id)
182{
183 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
184 devname, dev_id);
185}
186
Stephen Boyd0668d302014-01-02 16:37:32 -0800187extern int __must_check
188devm_request_any_context_irq(struct device *dev, unsigned int irq,
189 irq_handler_t handler, unsigned long irqflags,
190 const char *devname, void *dev_id);
191
Tejun Heo9ac78492007-01-20 16:00:26 +0900192extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
193
Ingo Molnard7e96292006-07-03 00:24:27 -0700194/*
195 * On lockdep we dont want to enable hardirqs in hardirq
196 * context. Use local_irq_enable_in_hardirq() to annotate
197 * kernel code that has to do this nevertheless (pretty much
198 * the only valid case is for old/broken hardware that is
199 * insanely slow).
200 *
201 * NOTE: in theory this might break fragile code that relies
202 * on hardirq delivery - in practice we dont seem to have such
203 * places left. So the only effect should be slightly increased
204 * irqs-off latencies.
205 */
206#ifdef CONFIG_LOCKDEP
207# define local_irq_enable_in_hardirq() do { } while (0)
208#else
209# define local_irq_enable_in_hardirq() local_irq_enable()
210#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212extern void disable_irq_nosync(unsigned int irq);
Peter Zijlstra02cea392015-02-05 14:06:23 +0100213extern bool disable_hardirq(unsigned int irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214extern void disable_irq(unsigned int irq);
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100215extern void disable_percpu_irq(unsigned int irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216extern void enable_irq(unsigned int irq);
Marc Zyngier1e7c5fd2011-09-30 10:48:47 +0100217extern void enable_percpu_irq(unsigned int irq, unsigned int type);
Thomas Petazzonif0cb3222015-10-20 15:23:51 +0200218extern bool irq_percpu_is_enabled(unsigned int irq);
Thomas Gleixnera92444c2014-02-15 00:55:19 +0000219extern void irq_wake_thread(unsigned int irq, void *dev_id);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700220
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100221/* The following three functions are for the core kernel use only. */
222extern void suspend_device_irqs(void);
223extern void resume_device_irqs(void);
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100224
Eyal Perryf0ba3d02014-05-20 17:57:00 +0300225/**
226 * struct irq_affinity_notify - context for notification of IRQ affinity changes
227 * @irq: Interrupt to which notification applies
228 * @kref: Reference count, for internal use
229 * @work: Work item, for internal use
230 * @notify: Function to be called on change. This will be
231 * called in process context.
232 * @release: Function to be called on release. This will be
233 * called in process context. Once registered, the
234 * structure must only be freed when this function is
235 * called or later.
236 */
237struct irq_affinity_notify {
238 unsigned int irq;
239 struct kref kref;
240 struct work_struct work;
241 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
242 void (*release)(struct kref *ref);
243};
244
Christoph Hellwig20e407e2016-11-08 17:15:01 -0800245/**
246 * struct irq_affinity - Description for automatic irq affinity assignements
247 * @pre_vectors: Don't apply affinity to @pre_vectors at beginning of
248 * the MSI(-X) vector space
249 * @post_vectors: Don't apply affinity to @post_vectors at end of
250 * the MSI(-X) vector space
251 */
252struct irq_affinity {
253 int pre_vectors;
254 int post_vectors;
255};
256
Martin Schwidefsky0244ad02013-08-30 09:39:53 +0200257#if defined(CONFIG_SMP)
Russell Kingd7b90682008-04-17 07:46:24 +0200258
Rusty Russelld036e672009-01-01 10:12:26 +1030259extern cpumask_var_t irq_default_affinity;
Max Krasnyansky18404752008-05-29 11:02:52 -0700260
Thomas Gleixner01f8fa42014-04-16 14:36:44 +0000261/* Internal implementation. Use the helpers below */
262extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
263 bool force);
264
265/**
266 * irq_set_affinity - Set the irq affinity of a given irq
267 * @irq: Interrupt to set affinity
Randy Dunlapdef5f122014-04-27 21:03:09 -0700268 * @cpumask: cpumask
Thomas Gleixner01f8fa42014-04-16 14:36:44 +0000269 *
270 * Fails if cpumask does not contain an online CPU
271 */
272static inline int
273irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
274{
275 return __irq_set_affinity(irq, cpumask, false);
276}
277
278/**
279 * irq_force_affinity - Force the irq affinity of a given irq
280 * @irq: Interrupt to set affinity
Randy Dunlapdef5f122014-04-27 21:03:09 -0700281 * @cpumask: cpumask
Thomas Gleixner01f8fa42014-04-16 14:36:44 +0000282 *
283 * Same as irq_set_affinity, but without checking the mask against
284 * online cpus.
285 *
286 * Solely for low level cpu hotplug code, where we need to make per
287 * cpu interrupts affine before the cpu becomes online.
288 */
289static inline int
290irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
291{
292 return __irq_set_affinity(irq, cpumask, true);
293}
294
Russell Kingd7b90682008-04-17 07:46:24 +0200295extern int irq_can_set_affinity(unsigned int irq);
Max Krasnyansky18404752008-05-29 11:02:52 -0700296extern int irq_select_affinity(unsigned int irq);
Russell Kingd7b90682008-04-17 07:46:24 +0200297
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700298extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000299
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000300extern int
301irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
302
Christoph Hellwig67c93c22016-11-08 17:15:03 -0800303struct cpumask *irq_create_affinity_masks(int nvec, const struct irq_affinity *affd);
Michael Hernandez6f9a22b2017-05-18 10:47:47 -0700304int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd);
Christoph Hellwig5e385a62016-07-04 17:39:27 +0900305
Russell Kingd7b90682008-04-17 07:46:24 +0200306#else /* CONFIG_SMP */
307
Rusty Russell0de26522008-12-13 21:20:26 +1030308static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
Russell Kingd7b90682008-04-17 07:46:24 +0200309{
310 return -EINVAL;
311}
312
Arnd Bergmann4c88d7f2014-04-23 14:49:17 +0200313static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
314{
315 return 0;
316}
317
Russell Kingd7b90682008-04-17 07:46:24 +0200318static inline int irq_can_set_affinity(unsigned int irq)
319{
320 return 0;
321}
322
Max Krasnyansky18404752008-05-29 11:02:52 -0700323static inline int irq_select_affinity(unsigned int irq) { return 0; }
324
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700325static inline int irq_set_affinity_hint(unsigned int irq,
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000326 const struct cpumask *m)
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700327{
328 return -EINVAL;
329}
Eyal Perryf0ba3d02014-05-20 17:57:00 +0300330
331static inline int
332irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
333{
334 return 0;
335}
Christoph Hellwig5e385a62016-07-04 17:39:27 +0900336
Thomas Gleixner34c3d982016-09-14 16:18:48 +0200337static inline struct cpumask *
Christoph Hellwig67c93c22016-11-08 17:15:03 -0800338irq_create_affinity_masks(int nvec, const struct irq_affinity *affd)
Thomas Gleixner34c3d982016-09-14 16:18:48 +0200339{
340 return NULL;
341}
342
343static inline int
Michael Hernandez6f9a22b2017-05-18 10:47:47 -0700344irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd)
Thomas Gleixner34c3d982016-09-14 16:18:48 +0200345{
346 return maxvec;
347}
348
Martin Schwidefsky0244ad02013-08-30 09:39:53 +0200349#endif /* CONFIG_SMP */
Russell Kingd7b90682008-04-17 07:46:24 +0200350
Ingo Molnarc01d4032006-07-03 00:24:27 -0700351/*
352 * Special lockdep variants of irq disabling/enabling.
353 * These should be used for locking constructs that
354 * know that a particular irq context which is disabled,
355 * and which is the only irq-context user of a lock,
356 * that it's safe to take the lock in the irq-disabled
357 * section without disabling hardirqs.
358 *
359 * On !CONFIG_LOCKDEP they are equivalent to the normal
360 * irq disable/enable methods.
361 */
362static inline void disable_irq_nosync_lockdep(unsigned int irq)
363{
364 disable_irq_nosync(irq);
365#ifdef CONFIG_LOCKDEP
366 local_irq_disable();
367#endif
368}
369
Arjan van de Vene8106b92006-09-29 02:01:08 -0700370static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
371{
372 disable_irq_nosync(irq);
373#ifdef CONFIG_LOCKDEP
374 local_irq_save(*flags);
375#endif
376}
377
Ingo Molnarc01d4032006-07-03 00:24:27 -0700378static inline void disable_irq_lockdep(unsigned int irq)
379{
380 disable_irq(irq);
381#ifdef CONFIG_LOCKDEP
382 local_irq_disable();
383#endif
384}
385
386static inline void enable_irq_lockdep(unsigned int irq)
387{
388#ifdef CONFIG_LOCKDEP
389 local_irq_enable();
390#endif
391 enable_irq(irq);
392}
393
Arjan van de Vene8106b92006-09-29 02:01:08 -0700394static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
395{
396#ifdef CONFIG_LOCKDEP
397 local_irq_restore(*flags);
398#endif
399 enable_irq(irq);
400}
401
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700402/* IRQ wakeup (PM) control: */
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100403extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
404
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700405static inline int enable_irq_wake(unsigned int irq)
406{
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100407 return irq_set_irq_wake(irq, 1);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700408}
409
410static inline int disable_irq_wake(unsigned int irq)
411{
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100412 return irq_set_irq_wake(irq, 0);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700413}
414
Marc Zyngier1b7047e2015-03-18 11:01:22 +0000415/*
416 * irq_get_irqchip_state/irq_set_irqchip_state specific flags
417 */
418enum irqchip_irq_state {
419 IRQCHIP_STATE_PENDING, /* Is interrupt pending? */
420 IRQCHIP_STATE_ACTIVE, /* Is interrupt in progress? */
421 IRQCHIP_STATE_MASKED, /* Is interrupt masked? */
422 IRQCHIP_STATE_LINE_LEVEL, /* Is IRQ line high? */
423};
424
425extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
426 bool *state);
427extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
428 bool state);
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000429
430#ifdef CONFIG_IRQ_FORCED_THREADING
431extern bool force_irqthreads;
432#else
433#define force_irqthreads (0)
434#endif
435
Andi Kleen3f744782005-09-12 18:49:24 +0200436#ifndef __ARCH_SET_SOFTIRQ_PENDING
437#define set_softirq_pending(x) (local_softirq_pending() = (x))
438#define or_softirq_pending(x) (local_softirq_pending() |= (x))
439#endif
440
Benjamin Herrenschmidt2d3fbbb2007-05-10 22:22:46 -0700441/* Some architectures might implement lazy enabling/disabling of
442 * interrupts. In some cases, such as stop_machine, we might want
443 * to ensure that after a local_irq_disable(), interrupts have
444 * really been disabled in hardware. Such architectures need to
445 * implement the following hook.
446 */
447#ifndef hard_irq_disable
448#define hard_irq_disable() do { } while(0)
449#endif
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
452 frequency threaded job scheduling. For almost all the purposes
453 tasklets are more than enough. F.e. all serial device BHs et
454 al. should be converted to tasklets, not to softirqs.
455 */
456
457enum
458{
459 HI_SOFTIRQ=0,
460 TIMER_SOFTIRQ,
461 NET_TX_SOFTIRQ,
462 NET_RX_SOFTIRQ,
Jens Axboeff856ba2006-01-09 16:02:34 +0100463 BLOCK_SOFTIRQ,
Christoph Hellwig511cbce2015-11-10 14:56:14 +0100464 IRQ_POLL_SOFTIRQ,
Christoph Lameterc9819f42006-12-10 02:20:25 -0800465 TASKLET_SOFTIRQ,
466 SCHED_SOFTIRQ,
Thomas Gleixnerc6eb3f72015-04-14 21:08:51 +0000467 HRTIMER_SOFTIRQ, /* Unused, but kept as tools rely on the
468 numbering. Sigh! */
Shaohua Li09223372011-06-14 13:26:25 +0800469 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
Alexey Dobriyan978b0112008-09-06 20:04:36 +0200470
471 NR_SOFTIRQS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472};
473
Paul E. McKenney803b0eb2012-08-23 08:34:07 -0700474#define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
475
Jason Baron5d592b42009-03-12 14:33:36 -0400476/* map softirq index to softirq name. update 'softirq_to_name' in
477 * kernel/softirq.c when adding a new softirq.
478 */
Joe Perchesce85b4f2014-01-27 17:07:16 -0800479extern const char * const softirq_to_name[NR_SOFTIRQS];
Jason Baron5d592b42009-03-12 14:33:36 -0400480
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481/* softirq mask and active fields moved to irq_cpustat_t in
482 * asm/hardirq.h to get better cache usage. KAO
483 */
484
485struct softirq_action
486{
487 void (*action)(struct softirq_action *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488};
489
490asmlinkage void do_softirq(void);
Adrian Bunkeb0f1c42008-04-29 00:59:12 -0700491asmlinkage void __do_softirq(void);
Frederic Weisbecker7d65f4a2013-09-05 15:49:45 +0200492
493#ifdef __ARCH_HAS_DO_SOFTIRQ
494void do_softirq_own_stack(void);
495#else
496static inline void do_softirq_own_stack(void)
497{
498 __do_softirq();
499}
500#endif
501
Carlos R. Mafra962cf362008-05-15 11:15:37 -0300502extern void open_softirq(int nr, void (*action)(struct softirq_action *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503extern void softirq_init(void);
Steven Rostedtf0696862012-01-25 20:18:55 -0500504extern void __raise_softirq_irqoff(unsigned int nr);
Lai Jiangshan2bf21602010-08-23 18:42:48 +0900505
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800506extern void raise_softirq_irqoff(unsigned int nr);
507extern void raise_softirq(unsigned int nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
Venkatesh Pallipadi4dd53d82010-12-21 17:09:00 -0800509DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
510
511static inline struct task_struct *this_cpu_ksoftirqd(void)
512{
513 return this_cpu_read(ksoftirqd);
514}
515
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516/* Tasklets --- multithreaded analogue of BHs.
517
518 Main feature differing them of generic softirqs: tasklet
519 is running only on one CPU simultaneously.
520
521 Main feature differing them of BHs: different tasklets
522 may be run simultaneously on different CPUs.
523
524 Properties:
525 * If tasklet_schedule() is called, then tasklet is guaranteed
526 to be executed on some cpu at least once after this.
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300527 * If the tasklet is already scheduled, but its execution is still not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 started, it will be executed only once.
529 * If this tasklet is already running on another CPU (or schedule is called
530 from tasklet itself), it is rescheduled for later.
531 * Tasklet is strictly serialized wrt itself, but not
532 wrt another tasklets. If client needs some intertask synchronization,
533 he makes it with spinlocks.
534 */
535
536struct tasklet_struct
537{
538 struct tasklet_struct *next;
539 unsigned long state;
540 atomic_t count;
541 void (*func)(unsigned long);
542 unsigned long data;
543};
544
545#define DECLARE_TASKLET(name, func, data) \
546struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
547
548#define DECLARE_TASKLET_DISABLED(name, func, data) \
549struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
550
551
552enum
553{
554 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
555 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
556};
557
558#ifdef CONFIG_SMP
559static inline int tasklet_trylock(struct tasklet_struct *t)
560{
561 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
562}
563
564static inline void tasklet_unlock(struct tasklet_struct *t)
565{
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100566 smp_mb__before_atomic();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 clear_bit(TASKLET_STATE_RUN, &(t)->state);
568}
569
570static inline void tasklet_unlock_wait(struct tasklet_struct *t)
571{
572 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
573}
574#else
575#define tasklet_trylock(t) 1
576#define tasklet_unlock_wait(t) do { } while (0)
577#define tasklet_unlock(t) do { } while (0)
578#endif
579
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800580extern void __tasklet_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
582static inline void tasklet_schedule(struct tasklet_struct *t)
583{
584 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
585 __tasklet_schedule(t);
586}
587
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800588extern void __tasklet_hi_schedule(struct tasklet_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
590static inline void tasklet_hi_schedule(struct tasklet_struct *t)
591{
592 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
593 __tasklet_hi_schedule(t);
594}
595
Vegard Nossum7c692cb2008-05-21 22:53:13 +0200596extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
597
598/*
599 * This version avoids touching any other tasklets. Needed for kmemcheck
600 * in order not to take any page faults while enqueueing this tasklet;
601 * consider VERY carefully whether you really need this or
602 * tasklet_hi_schedule()...
603 */
604static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
605{
606 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
607 __tasklet_hi_schedule_first(t);
608}
609
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611static inline void tasklet_disable_nosync(struct tasklet_struct *t)
612{
613 atomic_inc(&t->count);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100614 smp_mb__after_atomic();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615}
616
617static inline void tasklet_disable(struct tasklet_struct *t)
618{
619 tasklet_disable_nosync(t);
620 tasklet_unlock_wait(t);
621 smp_mb();
622}
623
624static inline void tasklet_enable(struct tasklet_struct *t)
625{
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100626 smp_mb__before_atomic();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 atomic_dec(&t->count);
628}
629
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630extern void tasklet_kill(struct tasklet_struct *t);
631extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
632extern void tasklet_init(struct tasklet_struct *t,
633 void (*func)(unsigned long), unsigned long data);
634
Peter Zijlstra9ba5f002009-07-22 14:18:35 +0200635struct tasklet_hrtimer {
636 struct hrtimer timer;
637 struct tasklet_struct tasklet;
638 enum hrtimer_restart (*function)(struct hrtimer *);
639};
640
641extern void
642tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
643 enum hrtimer_restart (*function)(struct hrtimer *),
644 clockid_t which_clock, enum hrtimer_mode mode);
645
646static inline
Thomas Gleixner61699e132015-04-14 21:09:23 +0000647void tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
648 const enum hrtimer_mode mode)
Peter Zijlstra9ba5f002009-07-22 14:18:35 +0200649{
Thomas Gleixner61699e132015-04-14 21:09:23 +0000650 hrtimer_start(&ttimer->timer, time, mode);
Peter Zijlstra9ba5f002009-07-22 14:18:35 +0200651}
652
653static inline
654void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
655{
656 hrtimer_cancel(&ttimer->timer);
657 tasklet_kill(&ttimer->tasklet);
658}
659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660/*
661 * Autoprobing for irqs:
662 *
663 * probe_irq_on() and probe_irq_off() provide robust primitives
664 * for accurate IRQ probing during kernel initialization. They are
665 * reasonably simple to use, are not "fooled" by spurious interrupts,
666 * and, unlike other attempts at IRQ probing, they do not get hung on
667 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
668 *
669 * For reasonably foolproof probing, use them as follows:
670 *
671 * 1. clear and/or mask the device's internal interrupt.
672 * 2. sti();
673 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
674 * 4. enable the device and cause it to trigger an interrupt.
675 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
676 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
677 * 7. service the device to clear its pending interrupt.
678 * 8. loop again if paranoia is required.
679 *
680 * probe_irq_on() returns a mask of allocated irq's.
681 *
682 * probe_irq_off() takes the mask as a parameter,
683 * and returns the irq number which occurred,
684 * or zero if none occurred, or a negative irq number
685 * if more than one irq occurred.
686 */
687
Martin Schwidefsky0244ad02013-08-30 09:39:53 +0200688#if !defined(CONFIG_GENERIC_IRQ_PROBE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689static inline unsigned long probe_irq_on(void)
690{
691 return 0;
692}
693static inline int probe_irq_off(unsigned long val)
694{
695 return 0;
696}
697static inline unsigned int probe_irq_mask(unsigned long val)
698{
699 return 0;
700}
701#else
702extern unsigned long probe_irq_on(void); /* returns 0 on failure */
703extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
704extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
705#endif
706
Andrew Morton6168a702007-02-17 21:22:39 -0800707#ifdef CONFIG_PROC_FS
708/* Initialize /proc/irq/ */
709extern void init_irq_proc(void);
710#else
711static inline void init_irq_proc(void)
712{
713}
714#endif
715
Daniel Lezcanob2d3d612017-06-23 16:11:07 +0200716#ifdef CONFIG_IRQ_TIMINGS
717void irq_timings_enable(void);
718void irq_timings_disable(void);
Daniel Lezcanoe1c92142017-06-23 16:11:08 +0200719u64 irq_timings_next_event(u64 now);
Daniel Lezcanob2d3d612017-06-23 16:11:07 +0200720#endif
721
Alexey Dobriyand43c36d2009-10-07 17:09:06 +0400722struct seq_file;
Adrian Bunkf74596d2008-02-06 01:36:35 -0800723int show_interrupts(struct seq_file *p, void *v);
Thomas Gleixnerc78b9b62010-12-16 17:21:47 +0100724int arch_show_interrupts(struct seq_file *p, int prec);
Adrian Bunkf74596d2008-02-06 01:36:35 -0800725
Yinghai Lu43a25632008-12-28 16:01:13 -0800726extern int early_irq_init(void);
Yinghai Lu4a046d12009-01-12 17:39:24 -0800727extern int arch_probe_nr_irqs(void);
Yinghai Lu43a25632008-12-28 16:01:13 -0800728extern int arch_early_irq_init(void);
Yinghai Lu43a25632008-12-28 16:01:13 -0800729
Alexander Potapenkobe7635e2016-03-25 14:22:05 -0700730/*
731 * We want to know which function is an entrypoint of a hardirq or a softirq.
732 */
733#define __irq_entry __attribute__((__section__(".irqentry.text")))
734#define __softirq_entry \
735 __attribute__((__section__(".softirqentry.text")))
736
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737#endif