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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/kernel/irq/manage.c
3 *
Ingo Molnara34db9b2006-06-29 02:24:50 -07004 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
5 * Copyright (C) 2005-2006 Thomas Gleixner
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * This file contains driver APIs to the irq subsystem.
8 */
9
Andrew Morton97fd75b2012-05-31 16:26:07 -070010#define pr_fmt(fmt) "genirq: " fmt
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/irq.h>
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010013#include <linux/kthread.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/module.h>
15#include <linux/random.h>
16#include <linux/interrupt.h>
Robert P. J. Day1aeb2722008-04-29 00:59:25 -070017#include <linux/slab.h>
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010018#include <linux/sched.h>
Clark Williams8bd75c72013-02-07 09:47:07 -060019#include <linux/sched/rt.h>
Oleg Nesterov4d1d61a2012-05-11 10:59:08 +100020#include <linux/task_work.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22#include "internals.h"
23
Thomas Gleixner8d32a302011-02-23 23:52:23 +000024#ifdef CONFIG_IRQ_FORCED_THREADING
25__read_mostly bool force_irqthreads;
26
27static int __init setup_forced_irqthreads(char *arg)
28{
29 force_irqthreads = true;
30 return 0;
31}
32early_param("threadirqs", setup_forced_irqthreads);
33#endif
34
Thomas Gleixner18258f72014-02-15 00:55:18 +000035static void __synchronize_hardirq(struct irq_desc *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
Thomas Gleixner32f41252011-03-28 14:10:52 +020037 bool inprogress;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Herbert Xua98ce5c2007-10-23 11:26:25 +080039 do {
40 unsigned long flags;
41
42 /*
43 * Wait until we're out of the critical section. This might
44 * give the wrong answer due to the lack of memory barriers.
45 */
Thomas Gleixner32f41252011-03-28 14:10:52 +020046 while (irqd_irq_inprogress(&desc->irq_data))
Herbert Xua98ce5c2007-10-23 11:26:25 +080047 cpu_relax();
48
49 /* Ok, that indicated we're done: double-check carefully. */
Thomas Gleixner239007b2009-11-17 16:46:45 +010050 raw_spin_lock_irqsave(&desc->lock, flags);
Thomas Gleixner32f41252011-03-28 14:10:52 +020051 inprogress = irqd_irq_inprogress(&desc->irq_data);
Thomas Gleixner239007b2009-11-17 16:46:45 +010052 raw_spin_unlock_irqrestore(&desc->lock, flags);
Herbert Xua98ce5c2007-10-23 11:26:25 +080053
54 /* Oops, that failed? */
Thomas Gleixner32f41252011-03-28 14:10:52 +020055 } while (inprogress);
Thomas Gleixner18258f72014-02-15 00:55:18 +000056}
Thomas Gleixner3aa551c2009-03-23 18:28:15 +010057
Thomas Gleixner18258f72014-02-15 00:55:18 +000058/**
59 * synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs)
60 * @irq: interrupt number to wait for
61 *
62 * This function waits for any pending hard IRQ handlers for this
63 * interrupt to complete before returning. If you use this
64 * function while holding a resource the IRQ handler may need you
65 * will deadlock. It does not take associated threaded handlers
66 * into account.
67 *
68 * Do not use this for shutdown scenarios where you must be sure
69 * that all parts (hardirq and threaded handler) have completed.
70 *
Peter Zijlstra02cea392015-02-05 14:06:23 +010071 * Returns: false if a threaded handler is active.
72 *
Thomas Gleixner18258f72014-02-15 00:55:18 +000073 * This function may be called - with care - from IRQ context.
74 */
Peter Zijlstra02cea392015-02-05 14:06:23 +010075bool synchronize_hardirq(unsigned int irq)
Thomas Gleixner18258f72014-02-15 00:55:18 +000076{
77 struct irq_desc *desc = irq_to_desc(irq);
78
Peter Zijlstra02cea392015-02-05 14:06:23 +010079 if (desc) {
Thomas Gleixner18258f72014-02-15 00:55:18 +000080 __synchronize_hardirq(desc);
Peter Zijlstra02cea392015-02-05 14:06:23 +010081 return !atomic_read(&desc->threads_active);
82 }
83
84 return true;
Thomas Gleixner18258f72014-02-15 00:55:18 +000085}
86EXPORT_SYMBOL(synchronize_hardirq);
87
88/**
89 * synchronize_irq - wait for pending IRQ handlers (on other CPUs)
90 * @irq: interrupt number to wait for
91 *
92 * This function waits for any pending IRQ handlers for this interrupt
93 * to complete before returning. If you use this function while
94 * holding a resource the IRQ handler may need you will deadlock.
95 *
96 * This function may be called - with care - from IRQ context.
97 */
98void synchronize_irq(unsigned int irq)
99{
100 struct irq_desc *desc = irq_to_desc(irq);
101
102 if (desc) {
103 __synchronize_hardirq(desc);
104 /*
105 * We made sure that no hardirq handler is
106 * running. Now verify that no threaded handlers are
107 * active.
108 */
109 wait_event(desc->wait_for_threads,
110 !atomic_read(&desc->threads_active));
111 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113EXPORT_SYMBOL(synchronize_irq);
114
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100115#ifdef CONFIG_SMP
116cpumask_var_t irq_default_affinity;
117
Jiang Liue019c242015-06-23 20:29:34 +0200118static int __irq_can_set_affinity(struct irq_desc *desc)
119{
120 if (!desc || !irqd_can_balance(&desc->irq_data) ||
121 !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity)
122 return 0;
123 return 1;
124}
125
Thomas Gleixner771ee3b2007-02-16 01:27:25 -0800126/**
127 * irq_can_set_affinity - Check if the affinity of a given irq can be set
128 * @irq: Interrupt to check
129 *
130 */
131int irq_can_set_affinity(unsigned int irq)
132{
Jiang Liue019c242015-06-23 20:29:34 +0200133 return __irq_can_set_affinity(irq_to_desc(irq));
Thomas Gleixner771ee3b2007-02-16 01:27:25 -0800134}
135
Thomas Gleixner591d2fb2009-07-21 11:09:39 +0200136/**
137 * irq_set_thread_affinity - Notify irq threads to adjust affinity
138 * @desc: irq descriptor which has affitnity changed
139 *
140 * We just set IRQTF_AFFINITY and delegate the affinity setting
141 * to the interrupt thread itself. We can not call
142 * set_cpus_allowed_ptr() here as we hold desc->lock and this
143 * code can be called from hard interrupt context.
144 */
145void irq_set_thread_affinity(struct irq_desc *desc)
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100146{
147 struct irqaction *action = desc->action;
148
149 while (action) {
150 if (action->thread)
Thomas Gleixner591d2fb2009-07-21 11:09:39 +0200151 set_bit(IRQTF_AFFINITY, &action->thread_flags);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100152 action = action->next;
153 }
154}
155
Thomas Gleixner1fa46f12011-02-07 16:46:58 +0100156#ifdef CONFIG_GENERIC_PENDING_IRQ
Thomas Gleixner0ef5ca12011-03-28 21:59:37 +0200157static inline bool irq_can_move_pcntxt(struct irq_data *data)
Thomas Gleixner1fa46f12011-02-07 16:46:58 +0100158{
Thomas Gleixner0ef5ca12011-03-28 21:59:37 +0200159 return irqd_can_move_in_process_context(data);
Thomas Gleixner1fa46f12011-02-07 16:46:58 +0100160}
Thomas Gleixner0ef5ca12011-03-28 21:59:37 +0200161static inline bool irq_move_pending(struct irq_data *data)
Thomas Gleixner1fa46f12011-02-07 16:46:58 +0100162{
Thomas Gleixner0ef5ca12011-03-28 21:59:37 +0200163 return irqd_is_setaffinity_pending(data);
Thomas Gleixner1fa46f12011-02-07 16:46:58 +0100164}
165static inline void
166irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
167{
168 cpumask_copy(desc->pending_mask, mask);
169}
170static inline void
171irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
172{
173 cpumask_copy(mask, desc->pending_mask);
174}
175#else
Thomas Gleixner0ef5ca12011-03-28 21:59:37 +0200176static inline bool irq_can_move_pcntxt(struct irq_data *data) { return true; }
Thomas Gleixnercd22c0e2011-03-29 11:36:05 +0200177static inline bool irq_move_pending(struct irq_data *data) { return false; }
Thomas Gleixner1fa46f12011-02-07 16:46:58 +0100178static inline void
179irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) { }
180static inline void
181irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { }
182#endif
183
Jiang Liu818b0f32012-03-30 23:11:34 +0800184int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
185 bool force)
186{
187 struct irq_desc *desc = irq_data_to_desc(data);
188 struct irq_chip *chip = irq_data_get_irq_chip(data);
189 int ret;
190
Thomas Gleixner01f8fa42014-04-16 14:36:44 +0000191 ret = chip->irq_set_affinity(data, mask, force);
Jiang Liu818b0f32012-03-30 23:11:34 +0800192 switch (ret) {
193 case IRQ_SET_MASK_OK:
Jiang Liu2cb62542014-11-06 22:20:18 +0800194 case IRQ_SET_MASK_OK_DONE:
Jiang Liu9df872f2015-06-03 11:47:50 +0800195 cpumask_copy(desc->irq_common_data.affinity, mask);
Jiang Liu818b0f32012-03-30 23:11:34 +0800196 case IRQ_SET_MASK_OK_NOCOPY:
197 irq_set_thread_affinity(desc);
198 ret = 0;
199 }
200
201 return ret;
202}
203
Thomas Gleixner01f8fa42014-04-16 14:36:44 +0000204int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
205 bool force)
David Daneyc2d0c552011-03-25 12:38:50 -0700206{
207 struct irq_chip *chip = irq_data_get_irq_chip(data);
208 struct irq_desc *desc = irq_data_to_desc(data);
209 int ret = 0;
210
211 if (!chip || !chip->irq_set_affinity)
212 return -EINVAL;
213
Thomas Gleixner0ef5ca12011-03-28 21:59:37 +0200214 if (irq_can_move_pcntxt(data)) {
Thomas Gleixner01f8fa42014-04-16 14:36:44 +0000215 ret = irq_do_set_affinity(data, mask, force);
David Daneyc2d0c552011-03-25 12:38:50 -0700216 } else {
217 irqd_set_move_pending(data);
218 irq_copy_pending(desc, mask);
219 }
220
221 if (desc->affinity_notify) {
222 kref_get(&desc->affinity_notify->kref);
223 schedule_work(&desc->affinity_notify->work);
224 }
David Daneyc2d0c552011-03-25 12:38:50 -0700225 irqd_set(data, IRQD_AFFINITY_SET);
226
227 return ret;
228}
229
Thomas Gleixner01f8fa42014-04-16 14:36:44 +0000230int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force)
Thomas Gleixner771ee3b2007-02-16 01:27:25 -0800231{
Yinghai Lu08678b02008-08-19 20:50:05 -0700232 struct irq_desc *desc = irq_to_desc(irq);
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100233 unsigned long flags;
David Daneyc2d0c552011-03-25 12:38:50 -0700234 int ret;
Thomas Gleixner771ee3b2007-02-16 01:27:25 -0800235
David Daneyc2d0c552011-03-25 12:38:50 -0700236 if (!desc)
Thomas Gleixner771ee3b2007-02-16 01:27:25 -0800237 return -EINVAL;
238
Thomas Gleixner239007b2009-11-17 16:46:45 +0100239 raw_spin_lock_irqsave(&desc->lock, flags);
Thomas Gleixner01f8fa42014-04-16 14:36:44 +0000240 ret = irq_set_affinity_locked(irq_desc_get_irq_data(desc), mask, force);
Thomas Gleixner239007b2009-11-17 16:46:45 +0100241 raw_spin_unlock_irqrestore(&desc->lock, flags);
Thomas Gleixner1fa46f12011-02-07 16:46:58 +0100242 return ret;
Thomas Gleixner771ee3b2007-02-16 01:27:25 -0800243}
244
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700245int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m)
246{
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700247 unsigned long flags;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100248 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700249
250 if (!desc)
251 return -EINVAL;
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700252 desc->affinity_hint = m;
Thomas Gleixner02725e72011-02-12 10:37:36 +0100253 irq_put_desc_unlock(desc, flags);
Jesse Brandeburge2e64a92014-12-18 17:22:06 -0800254 /* set the initial affinity to prevent every interrupt being on CPU0 */
Jesse Brandeburg4fe7ffb2015-01-28 10:57:39 -0800255 if (m)
256 __irq_set_affinity(irq, m, false);
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -0700257 return 0;
258}
259EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
260
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000261static void irq_affinity_notify(struct work_struct *work)
262{
263 struct irq_affinity_notify *notify =
264 container_of(work, struct irq_affinity_notify, work);
265 struct irq_desc *desc = irq_to_desc(notify->irq);
266 cpumask_var_t cpumask;
267 unsigned long flags;
268
Thomas Gleixner1fa46f12011-02-07 16:46:58 +0100269 if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL))
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000270 goto out;
271
272 raw_spin_lock_irqsave(&desc->lock, flags);
Thomas Gleixner0ef5ca12011-03-28 21:59:37 +0200273 if (irq_move_pending(&desc->irq_data))
Thomas Gleixner1fa46f12011-02-07 16:46:58 +0100274 irq_get_pending(cpumask, desc);
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000275 else
Jiang Liu9df872f2015-06-03 11:47:50 +0800276 cpumask_copy(cpumask, desc->irq_common_data.affinity);
Ben Hutchingscd7eab42011-01-19 21:01:44 +0000277 raw_spin_unlock_irqrestore(&desc->lock, flags);
278
279 notify->notify(notify, cpumask);
280
281 free_cpumask_var(cpumask);
282out:
283 kref_put(&notify->kref, notify->release);
284}
285
286/**
287 * irq_set_affinity_notifier - control notification of IRQ affinity changes
288 * @irq: Interrupt for which to enable/disable notification
289 * @notify: Context for notification, or %NULL to disable
290 * notification. Function pointers must be initialised;
291 * the other fields will be initialised by this function.
292 *
293 * Must be called in process context. Notification may only be enabled
294 * after the IRQ is allocated and must be disabled before the IRQ is
295 * freed using free_irq().
296 */
297int
298irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
299{
300 struct irq_desc *desc = irq_to_desc(irq);
301 struct irq_affinity_notify *old_notify;
302 unsigned long flags;
303
304 /* The release function is promised process context */
305 might_sleep();
306
307 if (!desc)
308 return -EINVAL;
309
310 /* Complete initialisation of *notify */
311 if (notify) {
312 notify->irq = irq;
313 kref_init(&notify->kref);
314 INIT_WORK(&notify->work, irq_affinity_notify);
315 }
316
317 raw_spin_lock_irqsave(&desc->lock, flags);
318 old_notify = desc->affinity_notify;
319 desc->affinity_notify = notify;
320 raw_spin_unlock_irqrestore(&desc->lock, flags);
321
322 if (old_notify)
323 kref_put(&old_notify->kref, old_notify->release);
324
325 return 0;
326}
327EXPORT_SYMBOL_GPL(irq_set_affinity_notifier);
328
Max Krasnyansky18404752008-05-29 11:02:52 -0700329#ifndef CONFIG_AUTO_IRQ_AFFINITY
330/*
331 * Generic version of the affinity autoselector.
332 */
Jiang Liua8a98ea2015-06-04 12:13:30 +0800333static int setup_affinity(struct irq_desc *desc, struct cpumask *mask)
Max Krasnyansky18404752008-05-29 11:02:52 -0700334{
Thomas Gleixner569bda82011-02-07 17:05:08 +0100335 struct cpumask *set = irq_default_affinity;
Jiang Liu67830112015-06-01 16:05:13 +0800336 int node = irq_desc_get_node(desc);
Thomas Gleixner569bda82011-02-07 17:05:08 +0100337
Thomas Gleixnerb0082072011-02-07 17:30:50 +0100338 /* Excludes PER_CPU and NO_BALANCE interrupts */
Jiang Liue019c242015-06-23 20:29:34 +0200339 if (!__irq_can_set_affinity(desc))
Max Krasnyansky18404752008-05-29 11:02:52 -0700340 return 0;
341
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100342 /*
343 * Preserve an userspace affinity setup, but make sure that
344 * one of the targets is online.
345 */
Thomas Gleixner2bdd1052011-02-08 17:22:00 +0100346 if (irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) {
Jiang Liu9df872f2015-06-03 11:47:50 +0800347 if (cpumask_intersects(desc->irq_common_data.affinity,
Thomas Gleixner569bda82011-02-07 17:05:08 +0100348 cpu_online_mask))
Jiang Liu9df872f2015-06-03 11:47:50 +0800349 set = desc->irq_common_data.affinity;
Thomas Gleixner0c6f8a82011-03-28 13:32:20 +0200350 else
Thomas Gleixner2bdd1052011-02-08 17:22:00 +0100351 irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET);
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100352 }
Max Krasnyansky18404752008-05-29 11:02:52 -0700353
Thomas Gleixner3b8249e2011-02-07 16:02:20 +0100354 cpumask_and(mask, cpu_online_mask, set);
Prarit Bhargava241fc642012-03-26 15:02:18 -0400355 if (node != NUMA_NO_NODE) {
356 const struct cpumask *nodemask = cpumask_of_node(node);
357
358 /* make sure at least one of the cpus in nodemask is online */
359 if (cpumask_intersects(mask, nodemask))
360 cpumask_and(mask, mask, nodemask);
361 }
Jiang Liu818b0f32012-03-30 23:11:34 +0800362 irq_do_set_affinity(&desc->irq_data, mask, false);
Max Krasnyansky18404752008-05-29 11:02:52 -0700363 return 0;
364}
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100365#else
Jiang Liua8a98ea2015-06-04 12:13:30 +0800366/* Wrapper for ALPHA specific affinity selector magic */
367static inline int setup_affinity(struct irq_desc *d, struct cpumask *mask)
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100368{
Jiang Liua8a98ea2015-06-04 12:13:30 +0800369 return irq_select_affinity(irq_desc_get_irq(d));
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100370}
Max Krasnyansky18404752008-05-29 11:02:52 -0700371#endif
372
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100373/*
374 * Called when affinity is set via /proc/irq
375 */
Thomas Gleixner3b8249e2011-02-07 16:02:20 +0100376int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask)
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100377{
378 struct irq_desc *desc = irq_to_desc(irq);
379 unsigned long flags;
380 int ret;
381
Thomas Gleixner239007b2009-11-17 16:46:45 +0100382 raw_spin_lock_irqsave(&desc->lock, flags);
Jiang Liua8a98ea2015-06-04 12:13:30 +0800383 ret = setup_affinity(desc, mask);
Thomas Gleixner239007b2009-11-17 16:46:45 +0100384 raw_spin_unlock_irqrestore(&desc->lock, flags);
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100385 return ret;
386}
387
388#else
Thomas Gleixner3b8249e2011-02-07 16:02:20 +0100389static inline int
Jiang Liua8a98ea2015-06-04 12:13:30 +0800390setup_affinity(struct irq_desc *desc, struct cpumask *mask)
Thomas Gleixnerf6d87f42008-11-07 13:18:30 +0100391{
392 return 0;
393}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394#endif
395
Feng Wufcf1ae22015-10-03 16:20:38 +0800396/**
397 * irq_set_vcpu_affinity - Set vcpu affinity for the interrupt
398 * @irq: interrupt number to set affinity
399 * @vcpu_info: vCPU specific data
400 *
401 * This function uses the vCPU specific data to set the vCPU
402 * affinity for an irq. The vCPU specific data is passed from
403 * outside, such as KVM. One example code path is as below:
404 * KVM -> IOMMU -> irq_set_vcpu_affinity().
405 */
406int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
407{
408 unsigned long flags;
409 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
410 struct irq_data *data;
411 struct irq_chip *chip;
412 int ret = -ENOSYS;
413
414 if (!desc)
415 return -EINVAL;
416
417 data = irq_desc_get_irq_data(desc);
418 chip = irq_data_get_irq_chip(data);
419 if (chip && chip->irq_set_vcpu_affinity)
420 ret = chip->irq_set_vcpu_affinity(data, vcpu_info);
421 irq_put_desc_unlock(desc, flags);
422
423 return ret;
424}
425EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity);
426
Jiang Liu79ff1cd2015-06-23 19:52:36 +0200427void __disable_irq(struct irq_desc *desc)
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100428{
Thomas Gleixner3aae9942011-02-04 10:17:52 +0100429 if (!desc->depth++)
Thomas Gleixner87923472011-02-03 12:27:44 +0100430 irq_disable(desc);
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100431}
432
Thomas Gleixner02725e72011-02-12 10:37:36 +0100433static int __disable_irq_nosync(unsigned int irq)
434{
435 unsigned long flags;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100436 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
Thomas Gleixner02725e72011-02-12 10:37:36 +0100437
438 if (!desc)
439 return -EINVAL;
Jiang Liu79ff1cd2015-06-23 19:52:36 +0200440 __disable_irq(desc);
Thomas Gleixner02725e72011-02-12 10:37:36 +0100441 irq_put_desc_busunlock(desc, flags);
442 return 0;
443}
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445/**
446 * disable_irq_nosync - disable an irq without waiting
447 * @irq: Interrupt to disable
448 *
449 * Disable the selected interrupt line. Disables and Enables are
450 * nested.
451 * Unlike disable_irq(), this function does not ensure existing
452 * instances of the IRQ handler have completed before returning.
453 *
454 * This function may be called from IRQ context.
455 */
456void disable_irq_nosync(unsigned int irq)
457{
Thomas Gleixner02725e72011-02-12 10:37:36 +0100458 __disable_irq_nosync(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460EXPORT_SYMBOL(disable_irq_nosync);
461
462/**
463 * disable_irq - disable an irq and wait for completion
464 * @irq: Interrupt to disable
465 *
466 * Disable the selected interrupt line. Enables and Disables are
467 * nested.
468 * This function waits for any pending IRQ handlers for this interrupt
469 * to complete before returning. If you use this function while
470 * holding a resource the IRQ handler may need you will deadlock.
471 *
472 * This function may be called - with care - from IRQ context.
473 */
474void disable_irq(unsigned int irq)
475{
Thomas Gleixner02725e72011-02-12 10:37:36 +0100476 if (!__disable_irq_nosync(irq))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 synchronize_irq(irq);
478}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479EXPORT_SYMBOL(disable_irq);
480
Peter Zijlstra02cea392015-02-05 14:06:23 +0100481/**
482 * disable_hardirq - disables an irq and waits for hardirq completion
483 * @irq: Interrupt to disable
484 *
485 * Disable the selected interrupt line. Enables and Disables are
486 * nested.
487 * This function waits for any pending hard IRQ handlers for this
488 * interrupt to complete before returning. If you use this function while
489 * holding a resource the hard IRQ handler may need you will deadlock.
490 *
491 * When used to optimistically disable an interrupt from atomic context
492 * the return value must be checked.
493 *
494 * Returns: false if a threaded handler is active.
495 *
496 * This function may be called - with care - from IRQ context.
497 */
498bool disable_hardirq(unsigned int irq)
499{
500 if (!__disable_irq_nosync(irq))
501 return synchronize_hardirq(irq);
502
503 return false;
504}
505EXPORT_SYMBOL_GPL(disable_hardirq);
506
Jiang Liu79ff1cd2015-06-23 19:52:36 +0200507void __enable_irq(struct irq_desc *desc)
Thomas Gleixner1adb0852008-04-28 17:01:56 +0200508{
509 switch (desc->depth) {
510 case 0:
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100511 err_out:
Jiang Liu79ff1cd2015-06-23 19:52:36 +0200512 WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n",
513 irq_desc_get_irq(desc));
Thomas Gleixner1adb0852008-04-28 17:01:56 +0200514 break;
515 case 1: {
Thomas Gleixnerc531e832011-02-08 12:44:58 +0100516 if (desc->istate & IRQS_SUSPENDED)
Rafael J. Wysocki0a0c5162009-03-16 22:33:49 +0100517 goto err_out;
Thomas Gleixner1adb0852008-04-28 17:01:56 +0200518 /* Prevent probing on this irq: */
Thomas Gleixner1ccb4e62011-02-09 14:44:17 +0100519 irq_settings_set_noprobe(desc);
Thomas Gleixner3aae9942011-02-04 10:17:52 +0100520 irq_enable(desc);
Jiang Liu0798abe2015-06-04 12:13:27 +0800521 check_irq_resend(desc);
Thomas Gleixner1adb0852008-04-28 17:01:56 +0200522 /* fall-through */
523 }
524 default:
525 desc->depth--;
526 }
527}
528
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529/**
530 * enable_irq - enable handling of an irq
531 * @irq: Interrupt to enable
532 *
533 * Undoes the effect of one call to disable_irq(). If this
534 * matches the last disable, processing of interrupts on this
535 * IRQ line is re-enabled.
536 *
Thomas Gleixner70aedd22009-08-13 12:17:48 +0200537 * This function may be called from IRQ context only when
Thomas Gleixner6b8ff312010-10-01 12:58:38 +0200538 * desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL !
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 */
540void enable_irq(unsigned int irq)
541{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 unsigned long flags;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100543 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Yinghai Lu7d94f7c2008-08-19 20:50:14 -0700545 if (!desc)
Matthew Wilcoxc2b5a252005-11-03 07:51:18 -0700546 return;
Thomas Gleixner50f7c032011-02-03 13:23:54 +0100547 if (WARN(!desc->irq_data.chip,
548 KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq))
Thomas Gleixner02725e72011-02-12 10:37:36 +0100549 goto out;
Thomas Gleixner2656c362010-10-22 14:47:57 +0200550
Jiang Liu79ff1cd2015-06-23 19:52:36 +0200551 __enable_irq(desc);
Thomas Gleixner02725e72011-02-12 10:37:36 +0100552out:
553 irq_put_desc_busunlock(desc, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555EXPORT_SYMBOL(enable_irq);
556
David Brownell0c5d1eb2008-10-01 14:46:18 -0700557static int set_irq_wake_real(unsigned int irq, unsigned int on)
Uwe Kleine-König2db87322008-07-23 14:42:25 +0200558{
Yinghai Lu08678b02008-08-19 20:50:05 -0700559 struct irq_desc *desc = irq_to_desc(irq);
Uwe Kleine-König2db87322008-07-23 14:42:25 +0200560 int ret = -ENXIO;
561
Santosh Shilimkar60f96b42011-09-09 13:59:35 +0530562 if (irq_desc_get_chip(desc)->flags & IRQCHIP_SKIP_SET_WAKE)
563 return 0;
564
Thomas Gleixner2f7e99b2010-09-27 12:45:50 +0000565 if (desc->irq_data.chip->irq_set_wake)
566 ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on);
Uwe Kleine-König2db87322008-07-23 14:42:25 +0200567
568 return ret;
569}
570
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700571/**
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100572 * irq_set_irq_wake - control irq power management wakeup
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700573 * @irq: interrupt to control
574 * @on: enable/disable power management wakeup
575 *
David Brownell15a647e2006-07-30 03:03:08 -0700576 * Enable/disable power management wakeup mode, which is
577 * disabled by default. Enables and disables must match,
578 * just as they match for non-wakeup mode support.
579 *
580 * Wakeup mode lets this IRQ wake the system from sleep
581 * states like "suspend to RAM".
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700582 */
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100583int irq_set_irq_wake(unsigned int irq, unsigned int on)
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700584{
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700585 unsigned long flags;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100586 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
Uwe Kleine-König2db87322008-07-23 14:42:25 +0200587 int ret = 0;
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700588
Jesper Juhl13863a62011-06-09 23:14:58 +0200589 if (!desc)
590 return -EINVAL;
591
David Brownell15a647e2006-07-30 03:03:08 -0700592 /* wakeup-capable irqs can be shared between drivers that
593 * don't need to have the same sleep mode behaviors.
594 */
David Brownell15a647e2006-07-30 03:03:08 -0700595 if (on) {
Uwe Kleine-König2db87322008-07-23 14:42:25 +0200596 if (desc->wake_depth++ == 0) {
597 ret = set_irq_wake_real(irq, on);
598 if (ret)
599 desc->wake_depth = 0;
600 else
Thomas Gleixner7f942262011-02-10 19:46:26 +0100601 irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE);
Uwe Kleine-König2db87322008-07-23 14:42:25 +0200602 }
David Brownell15a647e2006-07-30 03:03:08 -0700603 } else {
604 if (desc->wake_depth == 0) {
Arjan van de Ven7a2c4772008-07-25 01:45:54 -0700605 WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
Uwe Kleine-König2db87322008-07-23 14:42:25 +0200606 } else if (--desc->wake_depth == 0) {
607 ret = set_irq_wake_real(irq, on);
608 if (ret)
609 desc->wake_depth = 1;
610 else
Thomas Gleixner7f942262011-02-10 19:46:26 +0100611 irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE);
Uwe Kleine-König2db87322008-07-23 14:42:25 +0200612 }
David Brownell15a647e2006-07-30 03:03:08 -0700613 }
Thomas Gleixner02725e72011-02-12 10:37:36 +0100614 irq_put_desc_busunlock(desc, flags);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700615 return ret;
616}
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100617EXPORT_SYMBOL(irq_set_irq_wake);
Thomas Gleixnerba9a2332006-06-29 02:24:55 -0700618
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619/*
620 * Internal function that tells the architecture code whether a
621 * particular irq has been exclusively allocated or is available
622 * for driver use.
623 */
624int can_request_irq(unsigned int irq, unsigned long irqflags)
625{
Thomas Gleixnercc8c3b72010-03-23 22:40:53 +0100626 unsigned long flags;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +0100627 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
Thomas Gleixner02725e72011-02-12 10:37:36 +0100628 int canrequest = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
Yinghai Lu7d94f7c2008-08-19 20:50:14 -0700630 if (!desc)
631 return 0;
632
Thomas Gleixner02725e72011-02-12 10:37:36 +0100633 if (irq_settings_can_request(desc)) {
Ben Hutchings2779db82013-06-28 02:40:30 +0100634 if (!desc->action ||
635 irqflags & desc->action->flags & IRQF_SHARED)
636 canrequest = 1;
Thomas Gleixner02725e72011-02-12 10:37:36 +0100637 }
638 irq_put_desc_unlock(desc, flags);
639 return canrequest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640}
641
Jiang Liua1ff5412015-06-23 19:47:29 +0200642int __irq_set_trigger(struct irq_desc *desc, unsigned long flags)
Uwe Kleine-König82736f42008-07-23 21:28:54 -0700643{
Thomas Gleixner6b8ff312010-10-01 12:58:38 +0200644 struct irq_chip *chip = desc->irq_data.chip;
Thomas Gleixnerd4d5e082011-02-10 13:16:14 +0100645 int ret, unmask = 0;
Uwe Kleine-König82736f42008-07-23 21:28:54 -0700646
Thomas Gleixnerb2ba2c32010-09-27 12:45:47 +0000647 if (!chip || !chip->irq_set_type) {
Uwe Kleine-König82736f42008-07-23 21:28:54 -0700648 /*
649 * IRQF_TRIGGER_* but the PIC does not support multiple
650 * flow-types?
651 */
Jiang Liua1ff5412015-06-23 19:47:29 +0200652 pr_debug("No set_type function for IRQ %d (%s)\n",
653 irq_desc_get_irq(desc),
Thomas Gleixnerf5d89472012-04-19 12:06:13 +0200654 chip ? (chip->name ? : "unknown") : "unknown");
Uwe Kleine-König82736f42008-07-23 21:28:54 -0700655 return 0;
656 }
657
Thomas Gleixner876dbd42011-02-08 17:28:12 +0100658 flags &= IRQ_TYPE_SENSE_MASK;
Thomas Gleixnerd4d5e082011-02-10 13:16:14 +0100659
660 if (chip->flags & IRQCHIP_SET_TYPE_MASKED) {
Thomas Gleixner32f41252011-03-28 14:10:52 +0200661 if (!irqd_irq_masked(&desc->irq_data))
Thomas Gleixnerd4d5e082011-02-10 13:16:14 +0100662 mask_irq(desc);
Thomas Gleixner32f41252011-03-28 14:10:52 +0200663 if (!irqd_irq_disabled(&desc->irq_data))
Thomas Gleixnerd4d5e082011-02-10 13:16:14 +0100664 unmask = 1;
665 }
666
David Brownellf2b662d2008-12-01 14:31:38 -0800667 /* caller masked out all except trigger mode flags */
Thomas Gleixnerb2ba2c32010-09-27 12:45:47 +0000668 ret = chip->irq_set_type(&desc->irq_data, flags);
Uwe Kleine-König82736f42008-07-23 21:28:54 -0700669
Thomas Gleixner876dbd42011-02-08 17:28:12 +0100670 switch (ret) {
671 case IRQ_SET_MASK_OK:
Jiang Liu2cb62542014-11-06 22:20:18 +0800672 case IRQ_SET_MASK_OK_DONE:
Thomas Gleixner876dbd42011-02-08 17:28:12 +0100673 irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK);
674 irqd_set(&desc->irq_data, flags);
675
676 case IRQ_SET_MASK_OK_NOCOPY:
677 flags = irqd_get_trigger_type(&desc->irq_data);
678 irq_settings_set_trigger_mask(desc, flags);
679 irqd_clear(&desc->irq_data, IRQD_LEVEL);
680 irq_settings_clr_level(desc);
681 if (flags & IRQ_TYPE_LEVEL_MASK) {
682 irq_settings_set_level(desc);
683 irqd_set(&desc->irq_data, IRQD_LEVEL);
684 }
Thomas Gleixner46732472010-06-07 17:53:51 +0200685
Thomas Gleixnerd4d5e082011-02-10 13:16:14 +0100686 ret = 0;
Thomas Gleixner8fff39e2011-02-21 14:19:42 +0100687 break;
Thomas Gleixner876dbd42011-02-08 17:28:12 +0100688 default:
Andrew Morton97fd75b2012-05-31 16:26:07 -0700689 pr_err("Setting trigger mode %lu for irq %u failed (%pF)\n",
Jiang Liua1ff5412015-06-23 19:47:29 +0200690 flags, irq_desc_get_irq(desc), chip->irq_set_type);
David Brownell0c5d1eb2008-10-01 14:46:18 -0700691 }
Thomas Gleixnerd4d5e082011-02-10 13:16:14 +0100692 if (unmask)
693 unmask_irq(desc);
Uwe Kleine-König82736f42008-07-23 21:28:54 -0700694 return ret;
695}
696
Thomas Gleixner293a7a02012-10-16 15:07:49 -0700697#ifdef CONFIG_HARDIRQS_SW_RESEND
698int irq_set_parent(int irq, int parent_irq)
699{
700 unsigned long flags;
701 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
702
703 if (!desc)
704 return -EINVAL;
705
706 desc->parent_irq = parent_irq;
707
708 irq_put_desc_unlock(desc, flags);
709 return 0;
710}
711#endif
712
Thomas Gleixnerb25c3402009-08-13 12:17:22 +0200713/*
714 * Default primary interrupt handler for threaded interrupts. Is
715 * assigned as primary handler when request_threaded_irq is called
716 * with handler == NULL. Useful for oneshot interrupts.
717 */
718static irqreturn_t irq_default_primary_handler(int irq, void *dev_id)
719{
720 return IRQ_WAKE_THREAD;
721}
722
Thomas Gleixner399b5da2009-08-13 13:21:38 +0200723/*
724 * Primary handler for nested threaded interrupts. Should never be
725 * called.
726 */
727static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id)
728{
729 WARN(1, "Primary handler called for nested irq %d\n", irq);
730 return IRQ_NONE;
731}
732
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +0200733static irqreturn_t irq_forced_secondary_handler(int irq, void *dev_id)
734{
735 WARN(1, "Secondary action handler called for irq %d\n", irq);
736 return IRQ_NONE;
737}
738
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100739static int irq_wait_for_interrupt(struct irqaction *action)
740{
Ido Yariv550acb12011-12-01 13:55:08 +0200741 set_current_state(TASK_INTERRUPTIBLE);
742
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100743 while (!kthread_should_stop()) {
Thomas Gleixnerf48fe812009-03-24 11:46:22 +0100744
745 if (test_and_clear_bit(IRQTF_RUNTHREAD,
746 &action->thread_flags)) {
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100747 __set_current_state(TASK_RUNNING);
748 return 0;
Thomas Gleixnerf48fe812009-03-24 11:46:22 +0100749 }
750 schedule();
Ido Yariv550acb12011-12-01 13:55:08 +0200751 set_current_state(TASK_INTERRUPTIBLE);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100752 }
Ido Yariv550acb12011-12-01 13:55:08 +0200753 __set_current_state(TASK_RUNNING);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100754 return -1;
755}
756
Thomas Gleixnerb25c3402009-08-13 12:17:22 +0200757/*
758 * Oneshot interrupts keep the irq line masked until the threaded
759 * handler finished. unmask if the interrupt has not been disabled and
760 * is marked MASKED.
761 */
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000762static void irq_finalize_oneshot(struct irq_desc *desc,
Alexander Gordeevf3f79e32012-03-21 17:22:35 +0100763 struct irqaction *action)
Thomas Gleixnerb25c3402009-08-13 12:17:22 +0200764{
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +0200765 if (!(desc->istate & IRQS_ONESHOT) ||
766 action->handler == irq_forced_secondary_handler)
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000767 return;
Thomas Gleixner0b1adaa2010-03-09 19:45:54 +0100768again:
Thomas Gleixner3876ec92010-09-27 12:44:35 +0000769 chip_bus_lock(desc);
Thomas Gleixner239007b2009-11-17 16:46:45 +0100770 raw_spin_lock_irq(&desc->lock);
Thomas Gleixner0b1adaa2010-03-09 19:45:54 +0100771
772 /*
773 * Implausible though it may be we need to protect us against
774 * the following scenario:
775 *
776 * The thread is faster done than the hard interrupt handler
777 * on the other CPU. If we unmask the irq line then the
778 * interrupt can come in again and masks the line, leaves due
Thomas Gleixner009b4c32011-02-07 21:48:49 +0100779 * to IRQS_INPROGRESS and the irq line is masked forever.
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000780 *
781 * This also serializes the state of shared oneshot handlers
782 * versus "desc->threads_onehsot |= action->thread_mask;" in
783 * irq_wake_thread(). See the comment there which explains the
784 * serialization.
Thomas Gleixner0b1adaa2010-03-09 19:45:54 +0100785 */
Thomas Gleixner32f41252011-03-28 14:10:52 +0200786 if (unlikely(irqd_irq_inprogress(&desc->irq_data))) {
Thomas Gleixner0b1adaa2010-03-09 19:45:54 +0100787 raw_spin_unlock_irq(&desc->lock);
Thomas Gleixner3876ec92010-09-27 12:44:35 +0000788 chip_bus_sync_unlock(desc);
Thomas Gleixner0b1adaa2010-03-09 19:45:54 +0100789 cpu_relax();
790 goto again;
791 }
792
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000793 /*
794 * Now check again, whether the thread should run. Otherwise
795 * we would clear the threads_oneshot bit of this thread which
796 * was just set.
797 */
Alexander Gordeevf3f79e32012-03-21 17:22:35 +0100798 if (test_bit(IRQTF_RUNTHREAD, &action->thread_flags))
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000799 goto out_unlock;
800
801 desc->threads_oneshot &= ~action->thread_mask;
802
Thomas Gleixner32f41252011-03-28 14:10:52 +0200803 if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) &&
804 irqd_irq_masked(&desc->irq_data))
Thomas Gleixner328a4972014-03-13 19:03:51 +0100805 unmask_threaded_irq(desc);
Thomas Gleixner32f41252011-03-28 14:10:52 +0200806
Thomas Gleixnerb5faba22011-02-23 23:52:13 +0000807out_unlock:
Thomas Gleixner239007b2009-11-17 16:46:45 +0100808 raw_spin_unlock_irq(&desc->lock);
Thomas Gleixner3876ec92010-09-27 12:44:35 +0000809 chip_bus_sync_unlock(desc);
Thomas Gleixnerb25c3402009-08-13 12:17:22 +0200810}
811
Bruno Premont61f38262009-07-22 22:22:32 +0200812#ifdef CONFIG_SMP
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100813/*
Chuansheng Liub04c6442014-02-10 16:13:57 +0800814 * Check whether we need to change the affinity of the interrupt thread.
Thomas Gleixner591d2fb2009-07-21 11:09:39 +0200815 */
816static void
817irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
818{
819 cpumask_var_t mask;
Thomas Gleixner04aa5302012-11-03 11:52:09 +0100820 bool valid = true;
Thomas Gleixner591d2fb2009-07-21 11:09:39 +0200821
822 if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags))
823 return;
824
825 /*
826 * In case we are out of memory we set IRQTF_AFFINITY again and
827 * try again next time
828 */
829 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) {
830 set_bit(IRQTF_AFFINITY, &action->thread_flags);
831 return;
832 }
833
Thomas Gleixner239007b2009-11-17 16:46:45 +0100834 raw_spin_lock_irq(&desc->lock);
Thomas Gleixner04aa5302012-11-03 11:52:09 +0100835 /*
836 * This code is triggered unconditionally. Check the affinity
837 * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out.
838 */
Jiang Liu9df872f2015-06-03 11:47:50 +0800839 if (desc->irq_common_data.affinity)
840 cpumask_copy(mask, desc->irq_common_data.affinity);
Thomas Gleixner04aa5302012-11-03 11:52:09 +0100841 else
842 valid = false;
Thomas Gleixner239007b2009-11-17 16:46:45 +0100843 raw_spin_unlock_irq(&desc->lock);
Thomas Gleixner591d2fb2009-07-21 11:09:39 +0200844
Thomas Gleixner04aa5302012-11-03 11:52:09 +0100845 if (valid)
846 set_cpus_allowed_ptr(current, mask);
Thomas Gleixner591d2fb2009-07-21 11:09:39 +0200847 free_cpumask_var(mask);
848}
Bruno Premont61f38262009-07-22 22:22:32 +0200849#else
850static inline void
851irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
852#endif
Thomas Gleixner591d2fb2009-07-21 11:09:39 +0200853
854/*
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000855 * Interrupts which are not explicitely requested as threaded
856 * interrupts rely on the implicit bh/preempt disable of the hard irq
857 * context. So we need to disable bh here to avoid deadlocks and other
858 * side effects.
859 */
Sebastian Andrzej Siewior3a43e052011-05-31 08:56:11 +0200860static irqreturn_t
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000861irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action)
862{
Sebastian Andrzej Siewior3a43e052011-05-31 08:56:11 +0200863 irqreturn_t ret;
864
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000865 local_bh_disable();
Sebastian Andrzej Siewior3a43e052011-05-31 08:56:11 +0200866 ret = action->thread_fn(action->irq, action->dev_id);
Alexander Gordeevf3f79e32012-03-21 17:22:35 +0100867 irq_finalize_oneshot(desc, action);
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000868 local_bh_enable();
Sebastian Andrzej Siewior3a43e052011-05-31 08:56:11 +0200869 return ret;
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000870}
871
872/*
Xie XiuQif788e7b2013-10-18 09:12:04 +0800873 * Interrupts explicitly requested as threaded interrupts want to be
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000874 * preemtible - many of them need to sleep and wait for slow busses to
875 * complete.
876 */
Sebastian Andrzej Siewior3a43e052011-05-31 08:56:11 +0200877static irqreturn_t irq_thread_fn(struct irq_desc *desc,
878 struct irqaction *action)
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000879{
Sebastian Andrzej Siewior3a43e052011-05-31 08:56:11 +0200880 irqreturn_t ret;
881
882 ret = action->thread_fn(action->irq, action->dev_id);
Alexander Gordeevf3f79e32012-03-21 17:22:35 +0100883 irq_finalize_oneshot(desc, action);
Sebastian Andrzej Siewior3a43e052011-05-31 08:56:11 +0200884 return ret;
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000885}
886
Ido Yariv7140ea12011-12-02 18:24:12 +0200887static void wake_threads_waitq(struct irq_desc *desc)
888{
Chuansheng Liuc6856892014-02-24 11:29:50 +0800889 if (atomic_dec_and_test(&desc->threads_active))
Ido Yariv7140ea12011-12-02 18:24:12 +0200890 wake_up(&desc->wait_for_threads);
891}
892
Al Viro67d12142012-06-27 11:07:19 +0400893static void irq_thread_dtor(struct callback_head *unused)
Oleg Nesterov4d1d61a2012-05-11 10:59:08 +1000894{
895 struct task_struct *tsk = current;
896 struct irq_desc *desc;
897 struct irqaction *action;
898
899 if (WARN_ON_ONCE(!(current->flags & PF_EXITING)))
900 return;
901
902 action = kthread_data(tsk);
903
Linus Torvaldsfb21aff2012-05-31 18:47:30 -0700904 pr_err("exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n",
Alan Cox19af3952012-12-18 14:21:25 -0800905 tsk->comm, tsk->pid, action->irq);
Oleg Nesterov4d1d61a2012-05-11 10:59:08 +1000906
907
908 desc = irq_to_desc(action->irq);
909 /*
910 * If IRQTF_RUNTHREAD is set, we need to decrement
911 * desc->threads_active and wake possible waiters.
912 */
913 if (test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags))
914 wake_threads_waitq(desc);
915
916 /* Prevent a stale desc->threads_oneshot */
917 irq_finalize_oneshot(desc, action);
918}
919
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +0200920static void irq_wake_secondary(struct irq_desc *desc, struct irqaction *action)
921{
922 struct irqaction *secondary = action->secondary;
923
924 if (WARN_ON_ONCE(!secondary))
925 return;
926
927 raw_spin_lock_irq(&desc->lock);
928 __irq_wake_thread(desc, secondary);
929 raw_spin_unlock_irq(&desc->lock);
930}
931
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000932/*
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100933 * Interrupt handler thread
934 */
935static int irq_thread(void *data)
936{
Al Viro67d12142012-06-27 11:07:19 +0400937 struct callback_head on_exit_work;
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100938 struct irqaction *action = data;
939 struct irq_desc *desc = irq_to_desc(action->irq);
Sebastian Andrzej Siewior3a43e052011-05-31 08:56:11 +0200940 irqreturn_t (*handler_fn)(struct irq_desc *desc,
941 struct irqaction *action);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100942
Alexander Gordeev540b60e2012-03-09 14:59:13 +0100943 if (force_irqthreads && test_bit(IRQTF_FORCED_THREAD,
Thomas Gleixner8d32a302011-02-23 23:52:23 +0000944 &action->thread_flags))
945 handler_fn = irq_forced_thread_fn;
946 else
947 handler_fn = irq_thread_fn;
948
Al Viro41f9d292012-06-26 22:10:04 +0400949 init_task_work(&on_exit_work, irq_thread_dtor);
Oleg Nesterov4d1d61a2012-05-11 10:59:08 +1000950 task_work_add(current, &on_exit_work, false);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100951
Sankara Muthukrishnanf3de44e2012-10-31 15:41:23 -0500952 irq_thread_check_affinity(desc, action);
953
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100954 while (!irq_wait_for_interrupt(action)) {
Ido Yariv7140ea12011-12-02 18:24:12 +0200955 irqreturn_t action_ret;
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100956
Thomas Gleixner591d2fb2009-07-21 11:09:39 +0200957 irq_thread_check_affinity(desc, action);
958
Ido Yariv7140ea12011-12-02 18:24:12 +0200959 action_ret = handler_fn(desc, action);
Thomas Gleixner1e77d0a2013-03-07 14:53:45 +0100960 if (action_ret == IRQ_HANDLED)
961 atomic_inc(&desc->threads_handled);
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +0200962 if (action_ret == IRQ_WAKE_THREAD)
963 irq_wake_secondary(desc, action);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100964
Ido Yariv7140ea12011-12-02 18:24:12 +0200965 wake_threads_waitq(desc);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100966 }
967
Ido Yariv7140ea12011-12-02 18:24:12 +0200968 /*
969 * This is the regular exit path. __free_irq() is stopping the
970 * thread via kthread_stop() after calling
971 * synchronize_irq(). So neither IRQTF_RUNTHREAD nor the
Thomas Gleixnere04268b2012-03-15 22:55:21 +0100972 * oneshot mask bit can be set. We cannot verify that as we
973 * cannot touch the oneshot mask at this point anymore as
974 * __setup_irq() might have given out currents thread_mask
975 * again.
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100976 */
Oleg Nesterov4d1d61a2012-05-11 10:59:08 +1000977 task_work_cancel(current, irq_thread_dtor);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +0100978 return 0;
979}
980
Thomas Gleixnera92444c2014-02-15 00:55:19 +0000981/**
982 * irq_wake_thread - wake the irq thread for the action identified by dev_id
983 * @irq: Interrupt line
984 * @dev_id: Device identity for which the thread should be woken
985 *
986 */
987void irq_wake_thread(unsigned int irq, void *dev_id)
988{
989 struct irq_desc *desc = irq_to_desc(irq);
990 struct irqaction *action;
991 unsigned long flags;
992
993 if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
994 return;
995
996 raw_spin_lock_irqsave(&desc->lock, flags);
997 for (action = desc->action; action; action = action->next) {
998 if (action->dev_id == dev_id) {
999 if (action->thread)
1000 __irq_wake_thread(desc, action);
1001 break;
1002 }
1003 }
1004 raw_spin_unlock_irqrestore(&desc->lock, flags);
1005}
1006EXPORT_SYMBOL_GPL(irq_wake_thread);
1007
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001008static int irq_setup_forced_threading(struct irqaction *new)
Thomas Gleixner8d32a302011-02-23 23:52:23 +00001009{
1010 if (!force_irqthreads)
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001011 return 0;
Thomas Gleixner8d32a302011-02-23 23:52:23 +00001012 if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT))
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001013 return 0;
Thomas Gleixner8d32a302011-02-23 23:52:23 +00001014
1015 new->flags |= IRQF_ONESHOT;
1016
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001017 /*
1018 * Handle the case where we have a real primary handler and a
1019 * thread handler. We force thread them as well by creating a
1020 * secondary action.
1021 */
1022 if (new->handler != irq_default_primary_handler && new->thread_fn) {
1023 /* Allocate the secondary action */
1024 new->secondary = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
1025 if (!new->secondary)
1026 return -ENOMEM;
1027 new->secondary->handler = irq_forced_secondary_handler;
1028 new->secondary->thread_fn = new->thread_fn;
1029 new->secondary->dev_id = new->dev_id;
1030 new->secondary->irq = new->irq;
1031 new->secondary->name = new->name;
Thomas Gleixner8d32a302011-02-23 23:52:23 +00001032 }
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001033 /* Deal with the primary handler */
1034 set_bit(IRQTF_FORCED_THREAD, &new->thread_flags);
1035 new->thread_fn = new->handler;
1036 new->handler = irq_default_primary_handler;
1037 return 0;
Thomas Gleixner8d32a302011-02-23 23:52:23 +00001038}
1039
Thomas Gleixnerc1bacba2014-03-08 08:59:58 +01001040static int irq_request_resources(struct irq_desc *desc)
1041{
1042 struct irq_data *d = &desc->irq_data;
1043 struct irq_chip *c = d->chip;
1044
1045 return c->irq_request_resources ? c->irq_request_resources(d) : 0;
1046}
1047
1048static void irq_release_resources(struct irq_desc *desc)
1049{
1050 struct irq_data *d = &desc->irq_data;
1051 struct irq_chip *c = d->chip;
1052
1053 if (c->irq_release_resources)
1054 c->irq_release_resources(d);
1055}
1056
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001057static int
1058setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary)
1059{
1060 struct task_struct *t;
1061 struct sched_param param = {
1062 .sched_priority = MAX_USER_RT_PRIO/2,
1063 };
1064
1065 if (!secondary) {
1066 t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
1067 new->name);
1068 } else {
1069 t = kthread_create(irq_thread, new, "irq/%d-s-%s", irq,
1070 new->name);
1071 param.sched_priority -= 1;
1072 }
1073
1074 if (IS_ERR(t))
1075 return PTR_ERR(t);
1076
1077 sched_setscheduler_nocheck(t, SCHED_FIFO, &param);
1078
1079 /*
1080 * We keep the reference to the task struct even if
1081 * the thread dies to avoid that the interrupt code
1082 * references an already freed task_struct.
1083 */
1084 get_task_struct(t);
1085 new->thread = t;
1086 /*
1087 * Tell the thread to set its affinity. This is
1088 * important for shared interrupt handlers as we do
1089 * not invoke setup_affinity() for the secondary
1090 * handlers as everything is already set up. Even for
1091 * interrupts marked with IRQF_NO_BALANCE this is
1092 * correct as we want the thread to move to the cpu(s)
1093 * on which the requesting code placed the interrupt.
1094 */
1095 set_bit(IRQTF_AFFINITY, &new->thread_flags);
1096 return 0;
1097}
1098
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099/*
1100 * Internal function to register an irqaction - typically used to
1101 * allocate special interrupts that are part of the architecture.
1102 */
Thomas Gleixnerd3c60042008-10-16 09:55:00 +02001103static int
Ingo Molnar327ec562009-02-15 11:21:37 +01001104__setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105{
Ingo Molnarf17c7542009-02-17 20:43:37 +01001106 struct irqaction *old, **old_ptr;
Thomas Gleixnerb5faba22011-02-23 23:52:13 +00001107 unsigned long flags, thread_mask = 0;
Thomas Gleixner3b8249e2011-02-07 16:02:20 +01001108 int ret, nested, shared = 0;
1109 cpumask_var_t mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
Yinghai Lu7d94f7c2008-08-19 20:50:14 -07001111 if (!desc)
Matthew Wilcoxc2b5a252005-11-03 07:51:18 -07001112 return -EINVAL;
1113
Thomas Gleixner6b8ff312010-10-01 12:58:38 +02001114 if (desc->irq_data.chip == &no_irq_chip)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 return -ENOSYS;
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +02001116 if (!try_module_get(desc->owner))
1117 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001119 new->irq = irq;
1120
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 /*
Thomas Gleixner399b5da2009-08-13 13:21:38 +02001122 * Check whether the interrupt nests into another interrupt
1123 * thread.
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001124 */
Thomas Gleixner1ccb4e62011-02-09 14:44:17 +01001125 nested = irq_settings_is_nested_thread(desc);
Thomas Gleixner399b5da2009-08-13 13:21:38 +02001126 if (nested) {
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +02001127 if (!new->thread_fn) {
1128 ret = -EINVAL;
1129 goto out_mput;
1130 }
Thomas Gleixner399b5da2009-08-13 13:21:38 +02001131 /*
1132 * Replace the primary handler which was provided from
1133 * the driver for non nested interrupt handling by the
1134 * dummy function which warns when called.
1135 */
1136 new->handler = irq_nested_primary_handler;
Thomas Gleixner8d32a302011-02-23 23:52:23 +00001137 } else {
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001138 if (irq_settings_can_thread(desc)) {
1139 ret = irq_setup_forced_threading(new);
1140 if (ret)
1141 goto out_mput;
1142 }
Thomas Gleixner399b5da2009-08-13 13:21:38 +02001143 }
1144
1145 /*
1146 * Create a handler thread when a thread function is supplied
1147 * and the interrupt does not nest into another interrupt
1148 * thread.
1149 */
1150 if (new->thread_fn && !nested) {
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001151 ret = setup_irq_thread(new, irq, false);
1152 if (ret)
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +02001153 goto out_mput;
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001154 if (new->secondary) {
1155 ret = setup_irq_thread(new->secondary, irq, true);
1156 if (ret)
1157 goto out_thread;
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +02001158 }
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001159 }
1160
Thomas Gleixner3b8249e2011-02-07 16:02:20 +01001161 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) {
1162 ret = -ENOMEM;
1163 goto out_thread;
1164 }
1165
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001166 /*
Thomas Gleixnerdc9b2292012-07-13 19:29:45 +02001167 * Drivers are often written to work w/o knowledge about the
1168 * underlying irq chip implementation, so a request for a
1169 * threaded irq without a primary hard irq context handler
1170 * requires the ONESHOT flag to be set. Some irq chips like
1171 * MSI based interrupts are per se one shot safe. Check the
1172 * chip flags, so we can avoid the unmask dance at the end of
1173 * the threaded handler for those.
1174 */
1175 if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)
1176 new->flags &= ~IRQF_ONESHOT;
1177
1178 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 * The following block of code has to be executed atomically
1180 */
Thomas Gleixner239007b2009-11-17 16:46:45 +01001181 raw_spin_lock_irqsave(&desc->lock, flags);
Ingo Molnarf17c7542009-02-17 20:43:37 +01001182 old_ptr = &desc->action;
1183 old = *old_ptr;
Ingo Molnar06fcb0c2006-06-29 02:24:40 -07001184 if (old) {
Thomas Gleixnere76de9f2006-06-29 02:24:56 -07001185 /*
1186 * Can't share interrupts unless both agree to and are
1187 * the same type (level, edge, polarity). So both flag
Thomas Gleixner3cca53b2006-07-01 19:29:31 -07001188 * fields must have IRQF_SHARED set and the bits which
Thomas Gleixner9d591ed2011-02-23 23:52:16 +00001189 * set the trigger type must match. Also all must
1190 * agree on ONESHOT.
Thomas Gleixnere76de9f2006-06-29 02:24:56 -07001191 */
Thomas Gleixner3cca53b2006-07-01 19:29:31 -07001192 if (!((old->flags & new->flags) & IRQF_SHARED) ||
Thomas Gleixner9d591ed2011-02-23 23:52:16 +00001193 ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) ||
Thomas Gleixnerf5d89472012-04-19 12:06:13 +02001194 ((old->flags ^ new->flags) & IRQF_ONESHOT))
Dimitri Sivanichf5163422006-03-25 03:08:23 -08001195 goto mismatch;
1196
Dimitri Sivanichf5163422006-03-25 03:08:23 -08001197 /* All handlers must agree on per-cpuness */
Thomas Gleixner3cca53b2006-07-01 19:29:31 -07001198 if ((old->flags & IRQF_PERCPU) !=
1199 (new->flags & IRQF_PERCPU))
Dimitri Sivanichf5163422006-03-25 03:08:23 -08001200 goto mismatch;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
1202 /* add new interrupt at end of irq queue */
1203 do {
Thomas Gleixner52abb702012-03-06 23:18:54 +01001204 /*
1205 * Or all existing action->thread_mask bits,
1206 * so we can find the next zero bit for this
1207 * new action.
1208 */
Thomas Gleixnerb5faba22011-02-23 23:52:13 +00001209 thread_mask |= old->thread_mask;
Ingo Molnarf17c7542009-02-17 20:43:37 +01001210 old_ptr = &old->next;
1211 old = *old_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 } while (old);
1213 shared = 1;
1214 }
1215
Thomas Gleixnerb5faba22011-02-23 23:52:13 +00001216 /*
Thomas Gleixner52abb702012-03-06 23:18:54 +01001217 * Setup the thread mask for this irqaction for ONESHOT. For
1218 * !ONESHOT irqs the thread mask is 0 so we can avoid a
1219 * conditional in irq_wake_thread().
Thomas Gleixnerb5faba22011-02-23 23:52:13 +00001220 */
Thomas Gleixner52abb702012-03-06 23:18:54 +01001221 if (new->flags & IRQF_ONESHOT) {
1222 /*
1223 * Unlikely to have 32 resp 64 irqs sharing one line,
1224 * but who knows.
1225 */
1226 if (thread_mask == ~0UL) {
1227 ret = -EBUSY;
1228 goto out_mask;
1229 }
1230 /*
1231 * The thread_mask for the action is or'ed to
1232 * desc->thread_active to indicate that the
1233 * IRQF_ONESHOT thread handler has been woken, but not
1234 * yet finished. The bit is cleared when a thread
1235 * completes. When all threads of a shared interrupt
1236 * line have completed desc->threads_active becomes
1237 * zero and the interrupt line is unmasked. See
1238 * handle.c:irq_wake_thread() for further information.
1239 *
1240 * If no thread is woken by primary (hard irq context)
1241 * interrupt handlers, then desc->threads_active is
1242 * also checked for zero to unmask the irq line in the
1243 * affected hard irq flow handlers
1244 * (handle_[fasteoi|level]_irq).
1245 *
1246 * The new action gets the first zero bit of
1247 * thread_mask assigned. See the loop above which or's
1248 * all existing action->thread_mask bits.
1249 */
1250 new->thread_mask = 1 << ffz(thread_mask);
Thomas Gleixner1c6c6952012-04-19 10:35:17 +02001251
Thomas Gleixnerdc9b2292012-07-13 19:29:45 +02001252 } else if (new->handler == irq_default_primary_handler &&
1253 !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) {
Thomas Gleixner1c6c6952012-04-19 10:35:17 +02001254 /*
1255 * The interrupt was requested with handler = NULL, so
1256 * we use the default primary handler for it. But it
1257 * does not have the oneshot flag set. In combination
1258 * with level interrupts this is deadly, because the
1259 * default primary handler just wakes the thread, then
1260 * the irq lines is reenabled, but the device still
1261 * has the level irq asserted. Rinse and repeat....
1262 *
1263 * While this works for edge type interrupts, we play
1264 * it safe and reject unconditionally because we can't
1265 * say for sure which type this interrupt really
1266 * has. The type flags are unreliable as the
1267 * underlying chip implementation can override them.
1268 */
Andrew Morton97fd75b2012-05-31 16:26:07 -07001269 pr_err("Threaded irq requested with handler=NULL and !ONESHOT for irq %d\n",
Thomas Gleixner1c6c6952012-04-19 10:35:17 +02001270 irq);
1271 ret = -EINVAL;
1272 goto out_mask;
Thomas Gleixnerb5faba22011-02-23 23:52:13 +00001273 }
Thomas Gleixnerb5faba22011-02-23 23:52:13 +00001274
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 if (!shared) {
Thomas Gleixnerc1bacba2014-03-08 08:59:58 +01001276 ret = irq_request_resources(desc);
1277 if (ret) {
1278 pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n",
1279 new->name, irq, desc->irq_data.chip->name);
1280 goto out_mask;
1281 }
1282
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001283 init_waitqueue_head(&desc->wait_for_threads);
1284
Uwe Kleine-König82736f42008-07-23 21:28:54 -07001285 /* Setup the type (level, edge polarity) if configured: */
1286 if (new->flags & IRQF_TRIGGER_MASK) {
Jiang Liua1ff5412015-06-23 19:47:29 +02001287 ret = __irq_set_trigger(desc,
1288 new->flags & IRQF_TRIGGER_MASK);
Uwe Kleine-König82736f42008-07-23 21:28:54 -07001289
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001290 if (ret)
Thomas Gleixner3b8249e2011-02-07 16:02:20 +01001291 goto out_mask;
Thomas Gleixner091738a2011-02-14 20:16:43 +01001292 }
Ahmed S. Darwishf75d2222007-05-08 00:27:55 -07001293
Thomas Gleixner009b4c32011-02-07 21:48:49 +01001294 desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \
Thomas Gleixner32f41252011-03-28 14:10:52 +02001295 IRQS_ONESHOT | IRQS_WAITING);
1296 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
Thomas Gleixner94d39e12006-06-29 02:24:50 -07001297
Thomas Gleixnera0056772011-02-08 17:11:03 +01001298 if (new->flags & IRQF_PERCPU) {
1299 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1300 irq_settings_set_per_cpu(desc);
1301 }
Thomas Gleixner6a58fb32011-02-08 15:40:05 +01001302
Thomas Gleixnerb25c3402009-08-13 12:17:22 +02001303 if (new->flags & IRQF_ONESHOT)
Thomas Gleixner3d67bae2011-02-07 21:02:10 +01001304 desc->istate |= IRQS_ONESHOT;
Thomas Gleixnerb25c3402009-08-13 12:17:22 +02001305
Thomas Gleixner1ccb4e62011-02-09 14:44:17 +01001306 if (irq_settings_can_autoenable(desc))
Thomas Gleixnerb4bc7242012-02-08 11:57:52 +01001307 irq_startup(desc, true);
Thomas Gleixner46999232011-02-02 21:41:14 +00001308 else
Thomas Gleixnere76de9f2006-06-29 02:24:56 -07001309 /* Undo nested disables: */
1310 desc->depth = 1;
Max Krasnyansky18404752008-05-29 11:02:52 -07001311
Thomas Gleixner612e3682008-11-07 13:58:46 +01001312 /* Exclude IRQ from balancing if requested */
Thomas Gleixnera0056772011-02-08 17:11:03 +01001313 if (new->flags & IRQF_NOBALANCING) {
1314 irq_settings_set_no_balancing(desc);
1315 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1316 }
Thomas Gleixner612e3682008-11-07 13:58:46 +01001317
Max Krasnyansky18404752008-05-29 11:02:52 -07001318 /* Set default affinity mask once everything is setup */
Jiang Liua8a98ea2015-06-04 12:13:30 +08001319 setup_affinity(desc, mask);
David Brownell0c5d1eb2008-10-01 14:46:18 -07001320
Thomas Gleixner876dbd42011-02-08 17:28:12 +01001321 } else if (new->flags & IRQF_TRIGGER_MASK) {
1322 unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK;
1323 unsigned int omsk = irq_settings_get_trigger_mask(desc);
1324
1325 if (nmsk != omsk)
1326 /* hope the handler works with current trigger mode */
Andrew Morton97fd75b2012-05-31 16:26:07 -07001327 pr_warning("irq %d uses trigger mode %u; requested %u\n",
Thomas Gleixner876dbd42011-02-08 17:28:12 +01001328 irq, nmsk, omsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 }
Uwe Kleine-König82736f42008-07-23 21:28:54 -07001330
Ingo Molnarf17c7542009-02-17 20:43:37 +01001331 *old_ptr = new;
Uwe Kleine-König82736f42008-07-23 21:28:54 -07001332
Thomas Gleixnercab303b2014-08-28 11:44:31 +02001333 irq_pm_install_action(desc, new);
1334
Linus Torvalds8528b0f2007-01-23 14:16:31 -08001335 /* Reset broken irq detection when installing new handler */
1336 desc->irq_count = 0;
1337 desc->irqs_unhandled = 0;
Thomas Gleixner1adb0852008-04-28 17:01:56 +02001338
1339 /*
1340 * Check whether we disabled the irq via the spurious handler
1341 * before. Reenable it and give it another chance.
1342 */
Thomas Gleixner7acdd532011-02-07 20:40:54 +01001343 if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) {
1344 desc->istate &= ~IRQS_SPURIOUS_DISABLED;
Jiang Liu79ff1cd2015-06-23 19:52:36 +02001345 __enable_irq(desc);
Thomas Gleixner1adb0852008-04-28 17:01:56 +02001346 }
1347
Thomas Gleixner239007b2009-11-17 16:46:45 +01001348 raw_spin_unlock_irqrestore(&desc->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349
Thomas Gleixner69ab8492009-08-17 14:07:16 +02001350 /*
1351 * Strictly no need to wake it up, but hung_task complains
1352 * when no hard interrupt wakes the thread up.
1353 */
1354 if (new->thread)
1355 wake_up_process(new->thread);
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001356 if (new->secondary)
1357 wake_up_process(new->secondary->thread);
Thomas Gleixner69ab8492009-08-17 14:07:16 +02001358
Yinghai Lu2c6927a2008-08-19 20:50:11 -07001359 register_irq_proc(irq, desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 new->dir = NULL;
1361 register_handler_proc(irq, new);
Xiaotian Feng4f5058c2011-04-02 19:39:35 +08001362 free_cpumask_var(mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
1364 return 0;
Dimitri Sivanichf5163422006-03-25 03:08:23 -08001365
1366mismatch:
Thomas Gleixner3cca53b2006-07-01 19:29:31 -07001367 if (!(new->flags & IRQF_PROBE_SHARED)) {
Andrew Morton97fd75b2012-05-31 16:26:07 -07001368 pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n",
Thomas Gleixnerf5d89472012-04-19 12:06:13 +02001369 irq, new->flags, new->name, old->flags, old->name);
1370#ifdef CONFIG_DEBUG_SHIRQ
Andrew Morton13e87ec2006-04-27 18:39:18 -07001371 dump_stack();
Alan Cox3f050442007-02-12 00:52:04 -08001372#endif
Thomas Gleixnerf5d89472012-04-19 12:06:13 +02001373 }
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001374 ret = -EBUSY;
1375
Thomas Gleixner3b8249e2011-02-07 16:02:20 +01001376out_mask:
Dan Carpenter1c389792011-03-17 14:43:07 +03001377 raw_spin_unlock_irqrestore(&desc->lock, flags);
Thomas Gleixner3b8249e2011-02-07 16:02:20 +01001378 free_cpumask_var(mask);
1379
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001380out_thread:
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001381 if (new->thread) {
1382 struct task_struct *t = new->thread;
1383
1384 new->thread = NULL;
Alexander Gordeev05d74ef2012-03-09 14:59:40 +01001385 kthread_stop(t);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001386 put_task_struct(t);
1387 }
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001388 if (new->secondary && new->secondary->thread) {
1389 struct task_struct *t = new->secondary->thread;
1390
1391 new->secondary->thread = NULL;
1392 kthread_stop(t);
1393 put_task_struct(t);
1394 }
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +02001395out_mput:
1396 module_put(desc->owner);
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001397 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398}
1399
1400/**
Thomas Gleixnerd3c60042008-10-16 09:55:00 +02001401 * setup_irq - setup an interrupt
1402 * @irq: Interrupt line to setup
1403 * @act: irqaction for the interrupt
1404 *
1405 * Used to statically setup interrupts in the early boot process.
1406 */
1407int setup_irq(unsigned int irq, struct irqaction *act)
1408{
David Daney986c0112011-02-09 16:04:25 -08001409 int retval;
Thomas Gleixnerd3c60042008-10-16 09:55:00 +02001410 struct irq_desc *desc = irq_to_desc(irq);
1411
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001412 if (WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1413 return -EINVAL;
David Daney986c0112011-02-09 16:04:25 -08001414 chip_bus_lock(desc);
1415 retval = __setup_irq(irq, desc, act);
1416 chip_bus_sync_unlock(desc);
1417
1418 return retval;
Thomas Gleixnerd3c60042008-10-16 09:55:00 +02001419}
Magnus Dammeb53b4e2009-03-12 21:05:59 +09001420EXPORT_SYMBOL_GPL(setup_irq);
Thomas Gleixnerd3c60042008-10-16 09:55:00 +02001421
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001422/*
Magnus Dammcbf94f02009-03-12 21:05:51 +09001423 * Internal function to unregister an irqaction - used to free
1424 * regular and special interrupts that are part of the architecture.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 */
Magnus Dammcbf94f02009-03-12 21:05:51 +09001426static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427{
Thomas Gleixnerd3c60042008-10-16 09:55:00 +02001428 struct irq_desc *desc = irq_to_desc(irq);
Ingo Molnarf17c7542009-02-17 20:43:37 +01001429 struct irqaction *action, **action_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 unsigned long flags;
1431
Ingo Molnarae88a232009-02-15 11:29:50 +01001432 WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
Yinghai Lu7d94f7c2008-08-19 20:50:14 -07001433
Yinghai Lu7d94f7c2008-08-19 20:50:14 -07001434 if (!desc)
Magnus Dammf21cfb22009-03-12 21:05:42 +09001435 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
Thomas Gleixner239007b2009-11-17 16:46:45 +01001437 raw_spin_lock_irqsave(&desc->lock, flags);
Ingo Molnarae88a232009-02-15 11:29:50 +01001438
1439 /*
1440 * There can be multiple actions per IRQ descriptor, find the right
1441 * one based on the dev_id:
1442 */
Ingo Molnarf17c7542009-02-17 20:43:37 +01001443 action_ptr = &desc->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 for (;;) {
Ingo Molnarf17c7542009-02-17 20:43:37 +01001445 action = *action_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446
Ingo Molnarae88a232009-02-15 11:29:50 +01001447 if (!action) {
1448 WARN(1, "Trying to free already-free IRQ %d\n", irq);
Thomas Gleixner239007b2009-11-17 16:46:45 +01001449 raw_spin_unlock_irqrestore(&desc->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450
Magnus Dammf21cfb22009-03-12 21:05:42 +09001451 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 }
Ingo Molnarae88a232009-02-15 11:29:50 +01001453
Ingo Molnar8316e382009-02-17 20:28:29 +01001454 if (action->dev_id == dev_id)
1455 break;
Ingo Molnarf17c7542009-02-17 20:43:37 +01001456 action_ptr = &action->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 }
Ingo Molnarae88a232009-02-15 11:29:50 +01001458
1459 /* Found it - now remove it from the list of entries: */
Ingo Molnarf17c7542009-02-17 20:43:37 +01001460 *action_ptr = action->next;
Ingo Molnarae88a232009-02-15 11:29:50 +01001461
Thomas Gleixnercab303b2014-08-28 11:44:31 +02001462 irq_pm_remove_action(desc, action);
1463
Ingo Molnarae88a232009-02-15 11:29:50 +01001464 /* If this was the last handler, shut down the IRQ line: */
Thomas Gleixnerc1bacba2014-03-08 08:59:58 +01001465 if (!desc->action) {
Thomas Gleixnere9849772015-10-09 23:28:58 +02001466 irq_settings_clr_disable_unlazy(desc);
Thomas Gleixner46999232011-02-02 21:41:14 +00001467 irq_shutdown(desc);
Thomas Gleixnerc1bacba2014-03-08 08:59:58 +01001468 irq_release_resources(desc);
1469 }
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001470
Peter P Waskiewicz Jre7a297b2010-04-30 14:44:50 -07001471#ifdef CONFIG_SMP
1472 /* make sure affinity_hint is cleaned up */
1473 if (WARN_ON_ONCE(desc->affinity_hint))
1474 desc->affinity_hint = NULL;
1475#endif
1476
Thomas Gleixner239007b2009-11-17 16:46:45 +01001477 raw_spin_unlock_irqrestore(&desc->lock, flags);
Ingo Molnarae88a232009-02-15 11:29:50 +01001478
1479 unregister_handler_proc(irq, action);
1480
1481 /* Make sure it's not being used on another CPU: */
1482 synchronize_irq(irq);
1483
1484#ifdef CONFIG_DEBUG_SHIRQ
1485 /*
1486 * It's a shared IRQ -- the driver ought to be prepared for an IRQ
1487 * event to happen even now it's being freed, so let's make sure that
1488 * is so by doing an extra call to the handler ....
1489 *
1490 * ( We do this after actually deregistering it, to make sure that a
1491 * 'real' IRQ doesn't run in * parallel with our fake. )
1492 */
1493 if (action->flags & IRQF_SHARED) {
1494 local_irq_save(flags);
1495 action->handler(irq, dev_id);
1496 local_irq_restore(flags);
1497 }
1498#endif
Linus Torvalds2d860ad2009-08-13 13:05:10 -07001499
1500 if (action->thread) {
Alexander Gordeev05d74ef2012-03-09 14:59:40 +01001501 kthread_stop(action->thread);
Linus Torvalds2d860ad2009-08-13 13:05:10 -07001502 put_task_struct(action->thread);
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001503 if (action->secondary && action->secondary->thread) {
1504 kthread_stop(action->secondary->thread);
1505 put_task_struct(action->secondary->thread);
1506 }
Linus Torvalds2d860ad2009-08-13 13:05:10 -07001507 }
1508
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +02001509 module_put(desc->owner);
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001510 kfree(action->secondary);
Magnus Dammf21cfb22009-03-12 21:05:42 +09001511 return action;
1512}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
1514/**
Magnus Dammcbf94f02009-03-12 21:05:51 +09001515 * remove_irq - free an interrupt
1516 * @irq: Interrupt line to free
1517 * @act: irqaction for the interrupt
1518 *
1519 * Used to remove interrupts statically setup by the early boot process.
1520 */
1521void remove_irq(unsigned int irq, struct irqaction *act)
1522{
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001523 struct irq_desc *desc = irq_to_desc(irq);
1524
1525 if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc)))
1526 __free_irq(irq, act->dev_id);
Magnus Dammcbf94f02009-03-12 21:05:51 +09001527}
Magnus Dammeb53b4e2009-03-12 21:05:59 +09001528EXPORT_SYMBOL_GPL(remove_irq);
Magnus Dammcbf94f02009-03-12 21:05:51 +09001529
1530/**
Magnus Dammf21cfb22009-03-12 21:05:42 +09001531 * free_irq - free an interrupt allocated with request_irq
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 * @irq: Interrupt line to free
1533 * @dev_id: Device identity to free
1534 *
1535 * Remove an interrupt handler. The handler is removed and if the
1536 * interrupt line is no longer in use by any driver it is disabled.
1537 * On a shared IRQ the caller must ensure the interrupt is disabled
1538 * on the card it drives before calling this function. The function
1539 * does not return until any executing interrupts for this IRQ
1540 * have completed.
1541 *
1542 * This function must not be called from interrupt context.
1543 */
1544void free_irq(unsigned int irq, void *dev_id)
1545{
Thomas Gleixner70aedd22009-08-13 12:17:48 +02001546 struct irq_desc *desc = irq_to_desc(irq);
1547
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001548 if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
Thomas Gleixner70aedd22009-08-13 12:17:48 +02001549 return;
1550
Ben Hutchingscd7eab42011-01-19 21:01:44 +00001551#ifdef CONFIG_SMP
1552 if (WARN_ON(desc->affinity_notify))
1553 desc->affinity_notify = NULL;
1554#endif
1555
Thomas Gleixner3876ec92010-09-27 12:44:35 +00001556 chip_bus_lock(desc);
Magnus Dammcbf94f02009-03-12 21:05:51 +09001557 kfree(__free_irq(irq, dev_id));
Thomas Gleixner3876ec92010-09-27 12:44:35 +00001558 chip_bus_sync_unlock(desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560EXPORT_SYMBOL(free_irq);
1561
1562/**
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001563 * request_threaded_irq - allocate an interrupt line
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 * @irq: Interrupt line to allocate
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001565 * @handler: Function to be called when the IRQ occurs.
1566 * Primary handler for threaded interrupts
Thomas Gleixnerb25c3402009-08-13 12:17:22 +02001567 * If NULL and thread_fn != NULL the default
1568 * primary handler is installed
Thomas Gleixnerf48fe812009-03-24 11:46:22 +01001569 * @thread_fn: Function called from the irq handler thread
1570 * If NULL, no irq thread is created
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 * @irqflags: Interrupt type flags
1572 * @devname: An ascii name for the claiming device
1573 * @dev_id: A cookie passed back to the handler function
1574 *
1575 * This call allocates interrupt resources and enables the
1576 * interrupt line and IRQ handling. From the point this
1577 * call is made your handler function may be invoked. Since
1578 * your handler function must clear any interrupt the board
1579 * raises, you must take care both to initialise your hardware
1580 * and to set up the interrupt handler in the right order.
1581 *
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001582 * If you want to set up a threaded irq handler for your device
Javi Merino6d21af42011-10-26 10:16:11 +01001583 * then you need to supply @handler and @thread_fn. @handler is
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001584 * still called in hard interrupt context and has to check
1585 * whether the interrupt originates from the device. If yes it
1586 * needs to disable the interrupt on the device and return
Steven Rostedt39a2edd2009-05-12 14:35:54 -04001587 * IRQ_WAKE_THREAD which will wake up the handler thread and run
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001588 * @thread_fn. This split handler design is necessary to support
1589 * shared interrupts.
1590 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591 * Dev_id must be globally unique. Normally the address of the
1592 * device data structure is used as the cookie. Since the handler
1593 * receives this value it makes sense to use it.
1594 *
1595 * If your interrupt is shared you must pass a non NULL dev_id
1596 * as this is required when freeing the interrupt.
1597 *
1598 * Flags:
1599 *
Thomas Gleixner3cca53b2006-07-01 19:29:31 -07001600 * IRQF_SHARED Interrupt is shared
David Brownell0c5d1eb2008-10-01 14:46:18 -07001601 * IRQF_TRIGGER_* Specify active edge(s) or level
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 *
1603 */
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001604int request_threaded_irq(unsigned int irq, irq_handler_t handler,
1605 irq_handler_t thread_fn, unsigned long irqflags,
1606 const char *devname, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607{
Ingo Molnar06fcb0c2006-06-29 02:24:40 -07001608 struct irqaction *action;
Yinghai Lu08678b02008-08-19 20:50:05 -07001609 struct irq_desc *desc;
Thomas Gleixnerd3c60042008-10-16 09:55:00 +02001610 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611
David Brownell470c6622008-12-01 14:31:37 -08001612 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 * Sanity-check: shared interrupts must pass in a real dev-ID,
1614 * otherwise we'll have trouble later trying to figure out
1615 * which interrupt is which (messes up the interrupt freeing
1616 * logic etc).
Rafael J. Wysocki17f48032015-02-27 00:07:55 +01001617 *
1618 * Also IRQF_COND_SUSPEND only makes sense for shared interrupts and
1619 * it cannot be set along with IRQF_NO_SUSPEND.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 */
Rafael J. Wysocki17f48032015-02-27 00:07:55 +01001621 if (((irqflags & IRQF_SHARED) && !dev_id) ||
1622 (!(irqflags & IRQF_SHARED) && (irqflags & IRQF_COND_SUSPEND)) ||
1623 ((irqflags & IRQF_NO_SUSPEND) && (irqflags & IRQF_COND_SUSPEND)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 return -EINVAL;
Yinghai Lu7d94f7c2008-08-19 20:50:14 -07001625
Yinghai Lucb5bc832008-08-19 20:50:17 -07001626 desc = irq_to_desc(irq);
Yinghai Lu7d94f7c2008-08-19 20:50:14 -07001627 if (!desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 return -EINVAL;
Yinghai Lu7d94f7c2008-08-19 20:50:14 -07001629
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001630 if (!irq_settings_can_request(desc) ||
1631 WARN_ON(irq_settings_is_per_cpu_devid(desc)))
Thomas Gleixner6550c772006-06-29 02:24:49 -07001632 return -EINVAL;
Thomas Gleixnerb25c3402009-08-13 12:17:22 +02001633
1634 if (!handler) {
1635 if (!thread_fn)
1636 return -EINVAL;
1637 handler = irq_default_primary_handler;
1638 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639
Thomas Gleixner45535732009-02-22 23:00:32 +01001640 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 if (!action)
1642 return -ENOMEM;
1643
1644 action->handler = handler;
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001645 action->thread_fn = thread_fn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 action->flags = irqflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 action->name = devname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 action->dev_id = dev_id;
1649
Thomas Gleixner3876ec92010-09-27 12:44:35 +00001650 chip_bus_lock(desc);
Thomas Gleixnerd3c60042008-10-16 09:55:00 +02001651 retval = __setup_irq(irq, desc, action);
Thomas Gleixner3876ec92010-09-27 12:44:35 +00001652 chip_bus_sync_unlock(desc);
Thomas Gleixner70aedd22009-08-13 12:17:48 +02001653
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001654 if (retval) {
1655 kfree(action->secondary);
Anton Vorontsov377bf1e2008-08-21 22:58:28 +04001656 kfree(action);
Thomas Gleixner2a1d3ab2015-09-21 11:01:10 +02001657 }
Anton Vorontsov377bf1e2008-08-21 22:58:28 +04001658
Thomas Gleixner6d83f942011-02-18 23:27:23 +01001659#ifdef CONFIG_DEBUG_SHIRQ_FIXME
Luis Henriques6ce51c42009-04-01 18:06:35 +01001660 if (!retval && (irqflags & IRQF_SHARED)) {
David Woodhousea304e1b2007-02-12 00:52:00 -08001661 /*
1662 * It's a shared IRQ -- the driver ought to be prepared for it
1663 * to happen immediately, so let's make sure....
Anton Vorontsov377bf1e2008-08-21 22:58:28 +04001664 * We disable the irq to make sure that a 'real' IRQ doesn't
1665 * run in parallel with our fake.
David Woodhousea304e1b2007-02-12 00:52:00 -08001666 */
Jarek Poplawski59845b12007-08-30 23:56:34 -07001667 unsigned long flags;
David Woodhousea304e1b2007-02-12 00:52:00 -08001668
Anton Vorontsov377bf1e2008-08-21 22:58:28 +04001669 disable_irq(irq);
Jarek Poplawski59845b12007-08-30 23:56:34 -07001670 local_irq_save(flags);
Anton Vorontsov377bf1e2008-08-21 22:58:28 +04001671
Jarek Poplawski59845b12007-08-30 23:56:34 -07001672 handler(irq, dev_id);
Anton Vorontsov377bf1e2008-08-21 22:58:28 +04001673
Jarek Poplawski59845b12007-08-30 23:56:34 -07001674 local_irq_restore(flags);
Anton Vorontsov377bf1e2008-08-21 22:58:28 +04001675 enable_irq(irq);
David Woodhousea304e1b2007-02-12 00:52:00 -08001676 }
1677#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678 return retval;
1679}
Thomas Gleixner3aa551c2009-03-23 18:28:15 +01001680EXPORT_SYMBOL(request_threaded_irq);
Marc Zyngierae731f82010-03-15 22:56:33 +00001681
1682/**
1683 * request_any_context_irq - allocate an interrupt line
1684 * @irq: Interrupt line to allocate
1685 * @handler: Function to be called when the IRQ occurs.
1686 * Threaded handler for threaded interrupts.
1687 * @flags: Interrupt type flags
1688 * @name: An ascii name for the claiming device
1689 * @dev_id: A cookie passed back to the handler function
1690 *
1691 * This call allocates interrupt resources and enables the
1692 * interrupt line and IRQ handling. It selects either a
1693 * hardirq or threaded handling method depending on the
1694 * context.
1695 *
1696 * On failure, it returns a negative value. On success,
1697 * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED.
1698 */
1699int request_any_context_irq(unsigned int irq, irq_handler_t handler,
1700 unsigned long flags, const char *name, void *dev_id)
1701{
1702 struct irq_desc *desc = irq_to_desc(irq);
1703 int ret;
1704
1705 if (!desc)
1706 return -EINVAL;
1707
Thomas Gleixner1ccb4e62011-02-09 14:44:17 +01001708 if (irq_settings_is_nested_thread(desc)) {
Marc Zyngierae731f82010-03-15 22:56:33 +00001709 ret = request_threaded_irq(irq, NULL, handler,
1710 flags, name, dev_id);
1711 return !ret ? IRQC_IS_NESTED : ret;
1712 }
1713
1714 ret = request_irq(irq, handler, flags, name, dev_id);
1715 return !ret ? IRQC_IS_HARDIRQ : ret;
1716}
1717EXPORT_SYMBOL_GPL(request_any_context_irq);
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001718
Marc Zyngier1e7c5fd2011-09-30 10:48:47 +01001719void enable_percpu_irq(unsigned int irq, unsigned int type)
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001720{
1721 unsigned int cpu = smp_processor_id();
1722 unsigned long flags;
1723 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
1724
1725 if (!desc)
1726 return;
1727
Marc Zyngier1e7c5fd2011-09-30 10:48:47 +01001728 type &= IRQ_TYPE_SENSE_MASK;
1729 if (type != IRQ_TYPE_NONE) {
1730 int ret;
1731
Jiang Liua1ff5412015-06-23 19:47:29 +02001732 ret = __irq_set_trigger(desc, type);
Marc Zyngier1e7c5fd2011-09-30 10:48:47 +01001733
1734 if (ret) {
Thomas Gleixner32cffdd2011-10-04 18:43:57 +02001735 WARN(1, "failed to set type for IRQ%d\n", irq);
Marc Zyngier1e7c5fd2011-09-30 10:48:47 +01001736 goto out;
1737 }
1738 }
1739
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001740 irq_percpu_enable(desc, cpu);
Marc Zyngier1e7c5fd2011-09-30 10:48:47 +01001741out:
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001742 irq_put_desc_unlock(desc, flags);
1743}
Chris Metcalf36a5df82013-02-01 15:04:26 -05001744EXPORT_SYMBOL_GPL(enable_percpu_irq);
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001745
1746void disable_percpu_irq(unsigned int irq)
1747{
1748 unsigned int cpu = smp_processor_id();
1749 unsigned long flags;
1750 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU);
1751
1752 if (!desc)
1753 return;
1754
1755 irq_percpu_disable(desc, cpu);
1756 irq_put_desc_unlock(desc, flags);
1757}
Chris Metcalf36a5df82013-02-01 15:04:26 -05001758EXPORT_SYMBOL_GPL(disable_percpu_irq);
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001759
1760/*
1761 * Internal function to unregister a percpu irqaction.
1762 */
1763static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id)
1764{
1765 struct irq_desc *desc = irq_to_desc(irq);
1766 struct irqaction *action;
1767 unsigned long flags;
1768
1769 WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
1770
1771 if (!desc)
1772 return NULL;
1773
1774 raw_spin_lock_irqsave(&desc->lock, flags);
1775
1776 action = desc->action;
1777 if (!action || action->percpu_dev_id != dev_id) {
1778 WARN(1, "Trying to free already-free IRQ %d\n", irq);
1779 goto bad;
1780 }
1781
1782 if (!cpumask_empty(desc->percpu_enabled)) {
1783 WARN(1, "percpu IRQ %d still enabled on CPU%d!\n",
1784 irq, cpumask_first(desc->percpu_enabled));
1785 goto bad;
1786 }
1787
1788 /* Found it - now remove it from the list of entries: */
1789 desc->action = NULL;
1790
1791 raw_spin_unlock_irqrestore(&desc->lock, flags);
1792
1793 unregister_handler_proc(irq, action);
1794
1795 module_put(desc->owner);
1796 return action;
1797
1798bad:
1799 raw_spin_unlock_irqrestore(&desc->lock, flags);
1800 return NULL;
1801}
1802
1803/**
1804 * remove_percpu_irq - free a per-cpu interrupt
1805 * @irq: Interrupt line to free
1806 * @act: irqaction for the interrupt
1807 *
1808 * Used to remove interrupts statically setup by the early boot process.
1809 */
1810void remove_percpu_irq(unsigned int irq, struct irqaction *act)
1811{
1812 struct irq_desc *desc = irq_to_desc(irq);
1813
1814 if (desc && irq_settings_is_per_cpu_devid(desc))
1815 __free_percpu_irq(irq, act->percpu_dev_id);
1816}
1817
1818/**
1819 * free_percpu_irq - free an interrupt allocated with request_percpu_irq
1820 * @irq: Interrupt line to free
1821 * @dev_id: Device identity to free
1822 *
1823 * Remove a percpu interrupt handler. The handler is removed, but
1824 * the interrupt line is not disabled. This must be done on each
1825 * CPU before calling this function. The function does not return
1826 * until any executing interrupts for this IRQ have completed.
1827 *
1828 * This function must not be called from interrupt context.
1829 */
1830void free_percpu_irq(unsigned int irq, void __percpu *dev_id)
1831{
1832 struct irq_desc *desc = irq_to_desc(irq);
1833
1834 if (!desc || !irq_settings_is_per_cpu_devid(desc))
1835 return;
1836
1837 chip_bus_lock(desc);
1838 kfree(__free_percpu_irq(irq, dev_id));
1839 chip_bus_sync_unlock(desc);
1840}
Maxime Ripardaec2e2a2015-09-25 18:09:33 +02001841EXPORT_SYMBOL_GPL(free_percpu_irq);
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001842
1843/**
1844 * setup_percpu_irq - setup a per-cpu interrupt
1845 * @irq: Interrupt line to setup
1846 * @act: irqaction for the interrupt
1847 *
1848 * Used to statically setup per-cpu interrupts in the early boot process.
1849 */
1850int setup_percpu_irq(unsigned int irq, struct irqaction *act)
1851{
1852 struct irq_desc *desc = irq_to_desc(irq);
1853 int retval;
1854
1855 if (!desc || !irq_settings_is_per_cpu_devid(desc))
1856 return -EINVAL;
1857 chip_bus_lock(desc);
1858 retval = __setup_irq(irq, desc, act);
1859 chip_bus_sync_unlock(desc);
1860
1861 return retval;
1862}
1863
1864/**
1865 * request_percpu_irq - allocate a percpu interrupt line
1866 * @irq: Interrupt line to allocate
1867 * @handler: Function to be called when the IRQ occurs.
1868 * @devname: An ascii name for the claiming device
1869 * @dev_id: A percpu cookie passed back to the handler function
1870 *
Maxime Riparda1b7feb2015-09-25 18:09:32 +02001871 * This call allocates interrupt resources and enables the
1872 * interrupt on the local CPU. If the interrupt is supposed to be
1873 * enabled on other CPUs, it has to be done on each CPU using
1874 * enable_percpu_irq().
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001875 *
1876 * Dev_id must be globally unique. It is a per-cpu variable, and
1877 * the handler gets called with the interrupted CPU's instance of
1878 * that variable.
1879 */
1880int request_percpu_irq(unsigned int irq, irq_handler_t handler,
1881 const char *devname, void __percpu *dev_id)
1882{
1883 struct irqaction *action;
1884 struct irq_desc *desc;
1885 int retval;
1886
1887 if (!dev_id)
1888 return -EINVAL;
1889
1890 desc = irq_to_desc(irq);
1891 if (!desc || !irq_settings_can_request(desc) ||
1892 !irq_settings_is_per_cpu_devid(desc))
1893 return -EINVAL;
1894
1895 action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
1896 if (!action)
1897 return -ENOMEM;
1898
1899 action->handler = handler;
Marc Zyngier2ed0e642011-11-16 12:27:39 +00001900 action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +01001901 action->name = devname;
1902 action->percpu_dev_id = dev_id;
1903
1904 chip_bus_lock(desc);
1905 retval = __setup_irq(irq, desc, action);
1906 chip_bus_sync_unlock(desc);
1907
1908 if (retval)
1909 kfree(action);
1910
1911 return retval;
1912}
Maxime Ripardaec2e2a2015-09-25 18:09:33 +02001913EXPORT_SYMBOL_GPL(request_percpu_irq);
Marc Zyngier1b7047e2015-03-18 11:01:22 +00001914
1915/**
1916 * irq_get_irqchip_state - returns the irqchip state of a interrupt.
1917 * @irq: Interrupt line that is forwarded to a VM
1918 * @which: One of IRQCHIP_STATE_* the caller wants to know about
1919 * @state: a pointer to a boolean where the state is to be storeed
1920 *
1921 * This call snapshots the internal irqchip state of an
1922 * interrupt, returning into @state the bit corresponding to
1923 * stage @which
1924 *
1925 * This function should be called with preemption disabled if the
1926 * interrupt controller has per-cpu registers.
1927 */
1928int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
1929 bool *state)
1930{
1931 struct irq_desc *desc;
1932 struct irq_data *data;
1933 struct irq_chip *chip;
1934 unsigned long flags;
1935 int err = -EINVAL;
1936
1937 desc = irq_get_desc_buslock(irq, &flags, 0);
1938 if (!desc)
1939 return err;
1940
1941 data = irq_desc_get_irq_data(desc);
1942
1943 do {
1944 chip = irq_data_get_irq_chip(data);
1945 if (chip->irq_get_irqchip_state)
1946 break;
1947#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1948 data = data->parent_data;
1949#else
1950 data = NULL;
1951#endif
1952 } while (data);
1953
1954 if (data)
1955 err = chip->irq_get_irqchip_state(data, which, state);
1956
1957 irq_put_desc_busunlock(desc, flags);
1958 return err;
1959}
Bjorn Andersson1ee4fb32015-07-22 12:43:04 -07001960EXPORT_SYMBOL_GPL(irq_get_irqchip_state);
Marc Zyngier1b7047e2015-03-18 11:01:22 +00001961
1962/**
1963 * irq_set_irqchip_state - set the state of a forwarded interrupt.
1964 * @irq: Interrupt line that is forwarded to a VM
1965 * @which: State to be restored (one of IRQCHIP_STATE_*)
1966 * @val: Value corresponding to @which
1967 *
1968 * This call sets the internal irqchip state of an interrupt,
1969 * depending on the value of @which.
1970 *
1971 * This function should be called with preemption disabled if the
1972 * interrupt controller has per-cpu registers.
1973 */
1974int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
1975 bool val)
1976{
1977 struct irq_desc *desc;
1978 struct irq_data *data;
1979 struct irq_chip *chip;
1980 unsigned long flags;
1981 int err = -EINVAL;
1982
1983 desc = irq_get_desc_buslock(irq, &flags, 0);
1984 if (!desc)
1985 return err;
1986
1987 data = irq_desc_get_irq_data(desc);
1988
1989 do {
1990 chip = irq_data_get_irq_chip(data);
1991 if (chip->irq_set_irqchip_state)
1992 break;
1993#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1994 data = data->parent_data;
1995#else
1996 data = NULL;
1997#endif
1998 } while (data);
1999
2000 if (data)
2001 err = chip->irq_set_irqchip_state(data, which, val);
2002
2003 irq_put_desc_busunlock(desc, flags);
2004 return err;
2005}
Bjorn Andersson1ee4fb32015-07-22 12:43:04 -07002006EXPORT_SYMBOL_GPL(irq_set_irqchip_state);