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1da177e4 LT |
1 | /* |
2 | * linux/kernel/irq/manage.c | |
3 | * | |
a34db9b2 IM |
4 | * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar |
5 | * Copyright (C) 2005-2006 Thomas Gleixner | |
1da177e4 LT |
6 | * |
7 | * This file contains driver APIs to the irq subsystem. | |
8 | */ | |
9 | ||
97fd75b7 AM |
10 | #define pr_fmt(fmt) "genirq: " fmt |
11 | ||
1da177e4 | 12 | #include <linux/irq.h> |
3aa551c9 | 13 | #include <linux/kthread.h> |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/random.h> | |
16 | #include <linux/interrupt.h> | |
1aeb272c | 17 | #include <linux/slab.h> |
3aa551c9 | 18 | #include <linux/sched.h> |
4d1d61a6 | 19 | #include <linux/task_work.h> |
1da177e4 LT |
20 | |
21 | #include "internals.h" | |
22 | ||
8d32a307 TG |
23 | #ifdef CONFIG_IRQ_FORCED_THREADING |
24 | __read_mostly bool force_irqthreads; | |
25 | ||
26 | static int __init setup_forced_irqthreads(char *arg) | |
27 | { | |
28 | force_irqthreads = true; | |
29 | return 0; | |
30 | } | |
31 | early_param("threadirqs", setup_forced_irqthreads); | |
32 | #endif | |
33 | ||
1da177e4 LT |
34 | /** |
35 | * synchronize_irq - wait for pending IRQ handlers (on other CPUs) | |
1e5d5331 | 36 | * @irq: interrupt number to wait for |
1da177e4 LT |
37 | * |
38 | * This function waits for any pending IRQ handlers for this interrupt | |
39 | * to complete before returning. If you use this function while | |
40 | * holding a resource the IRQ handler may need you will deadlock. | |
41 | * | |
42 | * This function may be called - with care - from IRQ context. | |
43 | */ | |
44 | void synchronize_irq(unsigned int irq) | |
45 | { | |
cb5bc832 | 46 | struct irq_desc *desc = irq_to_desc(irq); |
32f4125e | 47 | bool inprogress; |
1da177e4 | 48 | |
7d94f7ca | 49 | if (!desc) |
c2b5a251 MW |
50 | return; |
51 | ||
a98ce5c6 HX |
52 | do { |
53 | unsigned long flags; | |
54 | ||
55 | /* | |
56 | * Wait until we're out of the critical section. This might | |
57 | * give the wrong answer due to the lack of memory barriers. | |
58 | */ | |
32f4125e | 59 | while (irqd_irq_inprogress(&desc->irq_data)) |
a98ce5c6 HX |
60 | cpu_relax(); |
61 | ||
62 | /* Ok, that indicated we're done: double-check carefully. */ | |
239007b8 | 63 | raw_spin_lock_irqsave(&desc->lock, flags); |
32f4125e | 64 | inprogress = irqd_irq_inprogress(&desc->irq_data); |
239007b8 | 65 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
a98ce5c6 HX |
66 | |
67 | /* Oops, that failed? */ | |
32f4125e | 68 | } while (inprogress); |
3aa551c9 TG |
69 | |
70 | /* | |
71 | * We made sure that no hardirq handler is running. Now verify | |
72 | * that no threaded handlers are active. | |
73 | */ | |
74 | wait_event(desc->wait_for_threads, !atomic_read(&desc->threads_active)); | |
1da177e4 | 75 | } |
1da177e4 LT |
76 | EXPORT_SYMBOL(synchronize_irq); |
77 | ||
3aa551c9 TG |
78 | #ifdef CONFIG_SMP |
79 | cpumask_var_t irq_default_affinity; | |
80 | ||
771ee3b0 TG |
81 | /** |
82 | * irq_can_set_affinity - Check if the affinity of a given irq can be set | |
83 | * @irq: Interrupt to check | |
84 | * | |
85 | */ | |
86 | int irq_can_set_affinity(unsigned int irq) | |
87 | { | |
08678b08 | 88 | struct irq_desc *desc = irq_to_desc(irq); |
771ee3b0 | 89 | |
bce43032 TG |
90 | if (!desc || !irqd_can_balance(&desc->irq_data) || |
91 | !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity) | |
771ee3b0 TG |
92 | return 0; |
93 | ||
94 | return 1; | |
95 | } | |
96 | ||
591d2fb0 TG |
97 | /** |
98 | * irq_set_thread_affinity - Notify irq threads to adjust affinity | |
99 | * @desc: irq descriptor which has affitnity changed | |
100 | * | |
101 | * We just set IRQTF_AFFINITY and delegate the affinity setting | |
102 | * to the interrupt thread itself. We can not call | |
103 | * set_cpus_allowed_ptr() here as we hold desc->lock and this | |
104 | * code can be called from hard interrupt context. | |
105 | */ | |
106 | void irq_set_thread_affinity(struct irq_desc *desc) | |
3aa551c9 TG |
107 | { |
108 | struct irqaction *action = desc->action; | |
109 | ||
110 | while (action) { | |
111 | if (action->thread) | |
591d2fb0 | 112 | set_bit(IRQTF_AFFINITY, &action->thread_flags); |
3aa551c9 TG |
113 | action = action->next; |
114 | } | |
115 | } | |
116 | ||
1fa46f1f | 117 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
0ef5ca1e | 118 | static inline bool irq_can_move_pcntxt(struct irq_data *data) |
1fa46f1f | 119 | { |
0ef5ca1e | 120 | return irqd_can_move_in_process_context(data); |
1fa46f1f | 121 | } |
0ef5ca1e | 122 | static inline bool irq_move_pending(struct irq_data *data) |
1fa46f1f | 123 | { |
0ef5ca1e | 124 | return irqd_is_setaffinity_pending(data); |
1fa46f1f TG |
125 | } |
126 | static inline void | |
127 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) | |
128 | { | |
129 | cpumask_copy(desc->pending_mask, mask); | |
130 | } | |
131 | static inline void | |
132 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) | |
133 | { | |
134 | cpumask_copy(mask, desc->pending_mask); | |
135 | } | |
136 | #else | |
0ef5ca1e | 137 | static inline bool irq_can_move_pcntxt(struct irq_data *data) { return true; } |
cd22c0e4 | 138 | static inline bool irq_move_pending(struct irq_data *data) { return false; } |
1fa46f1f TG |
139 | static inline void |
140 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) { } | |
141 | static inline void | |
142 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { } | |
143 | #endif | |
144 | ||
818b0f3b JL |
145 | int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask, |
146 | bool force) | |
147 | { | |
148 | struct irq_desc *desc = irq_data_to_desc(data); | |
149 | struct irq_chip *chip = irq_data_get_irq_chip(data); | |
150 | int ret; | |
151 | ||
152 | ret = chip->irq_set_affinity(data, mask, false); | |
153 | switch (ret) { | |
154 | case IRQ_SET_MASK_OK: | |
155 | cpumask_copy(data->affinity, mask); | |
156 | case IRQ_SET_MASK_OK_NOCOPY: | |
157 | irq_set_thread_affinity(desc); | |
158 | ret = 0; | |
159 | } | |
160 | ||
161 | return ret; | |
162 | } | |
163 | ||
c2d0c555 | 164 | int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask) |
771ee3b0 | 165 | { |
c2d0c555 DD |
166 | struct irq_chip *chip = irq_data_get_irq_chip(data); |
167 | struct irq_desc *desc = irq_data_to_desc(data); | |
1fa46f1f | 168 | int ret = 0; |
771ee3b0 | 169 | |
c2d0c555 | 170 | if (!chip || !chip->irq_set_affinity) |
771ee3b0 TG |
171 | return -EINVAL; |
172 | ||
0ef5ca1e | 173 | if (irq_can_move_pcntxt(data)) { |
818b0f3b | 174 | ret = irq_do_set_affinity(data, mask, false); |
1fa46f1f | 175 | } else { |
c2d0c555 | 176 | irqd_set_move_pending(data); |
1fa46f1f | 177 | irq_copy_pending(desc, mask); |
57b150cc | 178 | } |
1fa46f1f | 179 | |
cd7eab44 BH |
180 | if (desc->affinity_notify) { |
181 | kref_get(&desc->affinity_notify->kref); | |
182 | schedule_work(&desc->affinity_notify->work); | |
183 | } | |
c2d0c555 DD |
184 | irqd_set(data, IRQD_AFFINITY_SET); |
185 | ||
186 | return ret; | |
187 | } | |
188 | ||
189 | /** | |
190 | * irq_set_affinity - Set the irq affinity of a given irq | |
191 | * @irq: Interrupt to set affinity | |
30398bf6 | 192 | * @mask: cpumask |
c2d0c555 DD |
193 | * |
194 | */ | |
195 | int irq_set_affinity(unsigned int irq, const struct cpumask *mask) | |
196 | { | |
197 | struct irq_desc *desc = irq_to_desc(irq); | |
198 | unsigned long flags; | |
199 | int ret; | |
200 | ||
201 | if (!desc) | |
202 | return -EINVAL; | |
203 | ||
204 | raw_spin_lock_irqsave(&desc->lock, flags); | |
205 | ret = __irq_set_affinity_locked(irq_desc_get_irq_data(desc), mask); | |
239007b8 | 206 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
1fa46f1f | 207 | return ret; |
771ee3b0 TG |
208 | } |
209 | ||
e7a297b0 PWJ |
210 | int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) |
211 | { | |
e7a297b0 | 212 | unsigned long flags; |
31d9d9b6 | 213 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
e7a297b0 PWJ |
214 | |
215 | if (!desc) | |
216 | return -EINVAL; | |
e7a297b0 | 217 | desc->affinity_hint = m; |
02725e74 | 218 | irq_put_desc_unlock(desc, flags); |
e7a297b0 PWJ |
219 | return 0; |
220 | } | |
221 | EXPORT_SYMBOL_GPL(irq_set_affinity_hint); | |
222 | ||
cd7eab44 BH |
223 | static void irq_affinity_notify(struct work_struct *work) |
224 | { | |
225 | struct irq_affinity_notify *notify = | |
226 | container_of(work, struct irq_affinity_notify, work); | |
227 | struct irq_desc *desc = irq_to_desc(notify->irq); | |
228 | cpumask_var_t cpumask; | |
229 | unsigned long flags; | |
230 | ||
1fa46f1f | 231 | if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL)) |
cd7eab44 BH |
232 | goto out; |
233 | ||
234 | raw_spin_lock_irqsave(&desc->lock, flags); | |
0ef5ca1e | 235 | if (irq_move_pending(&desc->irq_data)) |
1fa46f1f | 236 | irq_get_pending(cpumask, desc); |
cd7eab44 | 237 | else |
1fb0ef31 | 238 | cpumask_copy(cpumask, desc->irq_data.affinity); |
cd7eab44 BH |
239 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
240 | ||
241 | notify->notify(notify, cpumask); | |
242 | ||
243 | free_cpumask_var(cpumask); | |
244 | out: | |
245 | kref_put(¬ify->kref, notify->release); | |
246 | } | |
247 | ||
248 | /** | |
249 | * irq_set_affinity_notifier - control notification of IRQ affinity changes | |
250 | * @irq: Interrupt for which to enable/disable notification | |
251 | * @notify: Context for notification, or %NULL to disable | |
252 | * notification. Function pointers must be initialised; | |
253 | * the other fields will be initialised by this function. | |
254 | * | |
255 | * Must be called in process context. Notification may only be enabled | |
256 | * after the IRQ is allocated and must be disabled before the IRQ is | |
257 | * freed using free_irq(). | |
258 | */ | |
259 | int | |
260 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) | |
261 | { | |
262 | struct irq_desc *desc = irq_to_desc(irq); | |
263 | struct irq_affinity_notify *old_notify; | |
264 | unsigned long flags; | |
265 | ||
266 | /* The release function is promised process context */ | |
267 | might_sleep(); | |
268 | ||
269 | if (!desc) | |
270 | return -EINVAL; | |
271 | ||
272 | /* Complete initialisation of *notify */ | |
273 | if (notify) { | |
274 | notify->irq = irq; | |
275 | kref_init(¬ify->kref); | |
276 | INIT_WORK(¬ify->work, irq_affinity_notify); | |
277 | } | |
278 | ||
279 | raw_spin_lock_irqsave(&desc->lock, flags); | |
280 | old_notify = desc->affinity_notify; | |
281 | desc->affinity_notify = notify; | |
282 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
283 | ||
284 | if (old_notify) | |
285 | kref_put(&old_notify->kref, old_notify->release); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(irq_set_affinity_notifier); | |
290 | ||
18404756 MK |
291 | #ifndef CONFIG_AUTO_IRQ_AFFINITY |
292 | /* | |
293 | * Generic version of the affinity autoselector. | |
294 | */ | |
3b8249e7 TG |
295 | static int |
296 | setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) | |
18404756 | 297 | { |
569bda8d | 298 | struct cpumask *set = irq_default_affinity; |
818b0f3b | 299 | int node = desc->irq_data.node; |
569bda8d | 300 | |
b008207c | 301 | /* Excludes PER_CPU and NO_BALANCE interrupts */ |
18404756 MK |
302 | if (!irq_can_set_affinity(irq)) |
303 | return 0; | |
304 | ||
f6d87f4b TG |
305 | /* |
306 | * Preserve an userspace affinity setup, but make sure that | |
307 | * one of the targets is online. | |
308 | */ | |
2bdd1055 | 309 | if (irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) { |
569bda8d TG |
310 | if (cpumask_intersects(desc->irq_data.affinity, |
311 | cpu_online_mask)) | |
312 | set = desc->irq_data.affinity; | |
0c6f8a8b | 313 | else |
2bdd1055 | 314 | irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET); |
f6d87f4b | 315 | } |
18404756 | 316 | |
3b8249e7 | 317 | cpumask_and(mask, cpu_online_mask, set); |
241fc640 PB |
318 | if (node != NUMA_NO_NODE) { |
319 | const struct cpumask *nodemask = cpumask_of_node(node); | |
320 | ||
321 | /* make sure at least one of the cpus in nodemask is online */ | |
322 | if (cpumask_intersects(mask, nodemask)) | |
323 | cpumask_and(mask, mask, nodemask); | |
324 | } | |
818b0f3b | 325 | irq_do_set_affinity(&desc->irq_data, mask, false); |
18404756 MK |
326 | return 0; |
327 | } | |
f6d87f4b | 328 | #else |
3b8249e7 TG |
329 | static inline int |
330 | setup_affinity(unsigned int irq, struct irq_desc *d, struct cpumask *mask) | |
f6d87f4b TG |
331 | { |
332 | return irq_select_affinity(irq); | |
333 | } | |
18404756 MK |
334 | #endif |
335 | ||
f6d87f4b TG |
336 | /* |
337 | * Called when affinity is set via /proc/irq | |
338 | */ | |
3b8249e7 | 339 | int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask) |
f6d87f4b TG |
340 | { |
341 | struct irq_desc *desc = irq_to_desc(irq); | |
342 | unsigned long flags; | |
343 | int ret; | |
344 | ||
239007b8 | 345 | raw_spin_lock_irqsave(&desc->lock, flags); |
3b8249e7 | 346 | ret = setup_affinity(irq, desc, mask); |
239007b8 | 347 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
f6d87f4b TG |
348 | return ret; |
349 | } | |
350 | ||
351 | #else | |
3b8249e7 TG |
352 | static inline int |
353 | setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) | |
f6d87f4b TG |
354 | { |
355 | return 0; | |
356 | } | |
1da177e4 LT |
357 | #endif |
358 | ||
0a0c5168 RW |
359 | void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend) |
360 | { | |
361 | if (suspend) { | |
685fd0b4 | 362 | if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND)) |
0a0c5168 | 363 | return; |
c531e836 | 364 | desc->istate |= IRQS_SUSPENDED; |
0a0c5168 RW |
365 | } |
366 | ||
3aae994f | 367 | if (!desc->depth++) |
87923470 | 368 | irq_disable(desc); |
0a0c5168 RW |
369 | } |
370 | ||
02725e74 TG |
371 | static int __disable_irq_nosync(unsigned int irq) |
372 | { | |
373 | unsigned long flags; | |
31d9d9b6 | 374 | struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
02725e74 TG |
375 | |
376 | if (!desc) | |
377 | return -EINVAL; | |
378 | __disable_irq(desc, irq, false); | |
379 | irq_put_desc_busunlock(desc, flags); | |
380 | return 0; | |
381 | } | |
382 | ||
1da177e4 LT |
383 | /** |
384 | * disable_irq_nosync - disable an irq without waiting | |
385 | * @irq: Interrupt to disable | |
386 | * | |
387 | * Disable the selected interrupt line. Disables and Enables are | |
388 | * nested. | |
389 | * Unlike disable_irq(), this function does not ensure existing | |
390 | * instances of the IRQ handler have completed before returning. | |
391 | * | |
392 | * This function may be called from IRQ context. | |
393 | */ | |
394 | void disable_irq_nosync(unsigned int irq) | |
395 | { | |
02725e74 | 396 | __disable_irq_nosync(irq); |
1da177e4 | 397 | } |
1da177e4 LT |
398 | EXPORT_SYMBOL(disable_irq_nosync); |
399 | ||
400 | /** | |
401 | * disable_irq - disable an irq and wait for completion | |
402 | * @irq: Interrupt to disable | |
403 | * | |
404 | * Disable the selected interrupt line. Enables and Disables are | |
405 | * nested. | |
406 | * This function waits for any pending IRQ handlers for this interrupt | |
407 | * to complete before returning. If you use this function while | |
408 | * holding a resource the IRQ handler may need you will deadlock. | |
409 | * | |
410 | * This function may be called - with care - from IRQ context. | |
411 | */ | |
412 | void disable_irq(unsigned int irq) | |
413 | { | |
02725e74 | 414 | if (!__disable_irq_nosync(irq)) |
1da177e4 LT |
415 | synchronize_irq(irq); |
416 | } | |
1da177e4 LT |
417 | EXPORT_SYMBOL(disable_irq); |
418 | ||
0a0c5168 | 419 | void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) |
1adb0850 | 420 | { |
dc5f219e | 421 | if (resume) { |
c531e836 | 422 | if (!(desc->istate & IRQS_SUSPENDED)) { |
dc5f219e TG |
423 | if (!desc->action) |
424 | return; | |
425 | if (!(desc->action->flags & IRQF_FORCE_RESUME)) | |
426 | return; | |
427 | /* Pretend that it got disabled ! */ | |
428 | desc->depth++; | |
429 | } | |
c531e836 | 430 | desc->istate &= ~IRQS_SUSPENDED; |
dc5f219e | 431 | } |
0a0c5168 | 432 | |
1adb0850 TG |
433 | switch (desc->depth) { |
434 | case 0: | |
0a0c5168 | 435 | err_out: |
b8c512f6 | 436 | WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq); |
1adb0850 TG |
437 | break; |
438 | case 1: { | |
c531e836 | 439 | if (desc->istate & IRQS_SUSPENDED) |
0a0c5168 | 440 | goto err_out; |
1adb0850 | 441 | /* Prevent probing on this irq: */ |
1ccb4e61 | 442 | irq_settings_set_noprobe(desc); |
3aae994f | 443 | irq_enable(desc); |
1adb0850 TG |
444 | check_irq_resend(desc, irq); |
445 | /* fall-through */ | |
446 | } | |
447 | default: | |
448 | desc->depth--; | |
449 | } | |
450 | } | |
451 | ||
1da177e4 LT |
452 | /** |
453 | * enable_irq - enable handling of an irq | |
454 | * @irq: Interrupt to enable | |
455 | * | |
456 | * Undoes the effect of one call to disable_irq(). If this | |
457 | * matches the last disable, processing of interrupts on this | |
458 | * IRQ line is re-enabled. | |
459 | * | |
70aedd24 | 460 | * This function may be called from IRQ context only when |
6b8ff312 | 461 | * desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL ! |
1da177e4 LT |
462 | */ |
463 | void enable_irq(unsigned int irq) | |
464 | { | |
1da177e4 | 465 | unsigned long flags; |
31d9d9b6 | 466 | struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
1da177e4 | 467 | |
7d94f7ca | 468 | if (!desc) |
c2b5a251 | 469 | return; |
50f7c032 TG |
470 | if (WARN(!desc->irq_data.chip, |
471 | KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq)) | |
02725e74 | 472 | goto out; |
2656c366 | 473 | |
0a0c5168 | 474 | __enable_irq(desc, irq, false); |
02725e74 TG |
475 | out: |
476 | irq_put_desc_busunlock(desc, flags); | |
1da177e4 | 477 | } |
1da177e4 LT |
478 | EXPORT_SYMBOL(enable_irq); |
479 | ||
0c5d1eb7 | 480 | static int set_irq_wake_real(unsigned int irq, unsigned int on) |
2db87321 | 481 | { |
08678b08 | 482 | struct irq_desc *desc = irq_to_desc(irq); |
2db87321 UKK |
483 | int ret = -ENXIO; |
484 | ||
60f96b41 SS |
485 | if (irq_desc_get_chip(desc)->flags & IRQCHIP_SKIP_SET_WAKE) |
486 | return 0; | |
487 | ||
2f7e99bb TG |
488 | if (desc->irq_data.chip->irq_set_wake) |
489 | ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on); | |
2db87321 UKK |
490 | |
491 | return ret; | |
492 | } | |
493 | ||
ba9a2331 | 494 | /** |
a0cd9ca2 | 495 | * irq_set_irq_wake - control irq power management wakeup |
ba9a2331 TG |
496 | * @irq: interrupt to control |
497 | * @on: enable/disable power management wakeup | |
498 | * | |
15a647eb DB |
499 | * Enable/disable power management wakeup mode, which is |
500 | * disabled by default. Enables and disables must match, | |
501 | * just as they match for non-wakeup mode support. | |
502 | * | |
503 | * Wakeup mode lets this IRQ wake the system from sleep | |
504 | * states like "suspend to RAM". | |
ba9a2331 | 505 | */ |
a0cd9ca2 | 506 | int irq_set_irq_wake(unsigned int irq, unsigned int on) |
ba9a2331 | 507 | { |
ba9a2331 | 508 | unsigned long flags; |
31d9d9b6 | 509 | struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
2db87321 | 510 | int ret = 0; |
ba9a2331 | 511 | |
13863a66 JJ |
512 | if (!desc) |
513 | return -EINVAL; | |
514 | ||
15a647eb DB |
515 | /* wakeup-capable irqs can be shared between drivers that |
516 | * don't need to have the same sleep mode behaviors. | |
517 | */ | |
15a647eb | 518 | if (on) { |
2db87321 UKK |
519 | if (desc->wake_depth++ == 0) { |
520 | ret = set_irq_wake_real(irq, on); | |
521 | if (ret) | |
522 | desc->wake_depth = 0; | |
523 | else | |
7f94226f | 524 | irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE); |
2db87321 | 525 | } |
15a647eb DB |
526 | } else { |
527 | if (desc->wake_depth == 0) { | |
7a2c4770 | 528 | WARN(1, "Unbalanced IRQ %d wake disable\n", irq); |
2db87321 UKK |
529 | } else if (--desc->wake_depth == 0) { |
530 | ret = set_irq_wake_real(irq, on); | |
531 | if (ret) | |
532 | desc->wake_depth = 1; | |
533 | else | |
7f94226f | 534 | irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE); |
2db87321 | 535 | } |
15a647eb | 536 | } |
02725e74 | 537 | irq_put_desc_busunlock(desc, flags); |
ba9a2331 TG |
538 | return ret; |
539 | } | |
a0cd9ca2 | 540 | EXPORT_SYMBOL(irq_set_irq_wake); |
ba9a2331 | 541 | |
1da177e4 LT |
542 | /* |
543 | * Internal function that tells the architecture code whether a | |
544 | * particular irq has been exclusively allocated or is available | |
545 | * for driver use. | |
546 | */ | |
547 | int can_request_irq(unsigned int irq, unsigned long irqflags) | |
548 | { | |
cc8c3b78 | 549 | unsigned long flags; |
31d9d9b6 | 550 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); |
02725e74 | 551 | int canrequest = 0; |
1da177e4 | 552 | |
7d94f7ca YL |
553 | if (!desc) |
554 | return 0; | |
555 | ||
02725e74 TG |
556 | if (irq_settings_can_request(desc)) { |
557 | if (desc->action) | |
558 | if (irqflags & desc->action->flags & IRQF_SHARED) | |
559 | canrequest =1; | |
560 | } | |
561 | irq_put_desc_unlock(desc, flags); | |
562 | return canrequest; | |
1da177e4 LT |
563 | } |
564 | ||
0c5d1eb7 | 565 | int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, |
b2ba2c30 | 566 | unsigned long flags) |
82736f4d | 567 | { |
6b8ff312 | 568 | struct irq_chip *chip = desc->irq_data.chip; |
d4d5e089 | 569 | int ret, unmask = 0; |
82736f4d | 570 | |
b2ba2c30 | 571 | if (!chip || !chip->irq_set_type) { |
82736f4d UKK |
572 | /* |
573 | * IRQF_TRIGGER_* but the PIC does not support multiple | |
574 | * flow-types? | |
575 | */ | |
97fd75b7 | 576 | pr_debug("No set_type function for IRQ %d (%s)\n", irq, |
f5d89470 | 577 | chip ? (chip->name ? : "unknown") : "unknown"); |
82736f4d UKK |
578 | return 0; |
579 | } | |
580 | ||
876dbd4c | 581 | flags &= IRQ_TYPE_SENSE_MASK; |
d4d5e089 TG |
582 | |
583 | if (chip->flags & IRQCHIP_SET_TYPE_MASKED) { | |
32f4125e | 584 | if (!irqd_irq_masked(&desc->irq_data)) |
d4d5e089 | 585 | mask_irq(desc); |
32f4125e | 586 | if (!irqd_irq_disabled(&desc->irq_data)) |
d4d5e089 TG |
587 | unmask = 1; |
588 | } | |
589 | ||
f2b662da | 590 | /* caller masked out all except trigger mode flags */ |
b2ba2c30 | 591 | ret = chip->irq_set_type(&desc->irq_data, flags); |
82736f4d | 592 | |
876dbd4c TG |
593 | switch (ret) { |
594 | case IRQ_SET_MASK_OK: | |
595 | irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK); | |
596 | irqd_set(&desc->irq_data, flags); | |
597 | ||
598 | case IRQ_SET_MASK_OK_NOCOPY: | |
599 | flags = irqd_get_trigger_type(&desc->irq_data); | |
600 | irq_settings_set_trigger_mask(desc, flags); | |
601 | irqd_clear(&desc->irq_data, IRQD_LEVEL); | |
602 | irq_settings_clr_level(desc); | |
603 | if (flags & IRQ_TYPE_LEVEL_MASK) { | |
604 | irq_settings_set_level(desc); | |
605 | irqd_set(&desc->irq_data, IRQD_LEVEL); | |
606 | } | |
46732475 | 607 | |
d4d5e089 | 608 | ret = 0; |
8fff39e0 | 609 | break; |
876dbd4c | 610 | default: |
97fd75b7 | 611 | pr_err("Setting trigger mode %lu for irq %u failed (%pF)\n", |
876dbd4c | 612 | flags, irq, chip->irq_set_type); |
0c5d1eb7 | 613 | } |
d4d5e089 TG |
614 | if (unmask) |
615 | unmask_irq(desc); | |
82736f4d UKK |
616 | return ret; |
617 | } | |
618 | ||
293a7a0a TG |
619 | #ifdef CONFIG_HARDIRQS_SW_RESEND |
620 | int irq_set_parent(int irq, int parent_irq) | |
621 | { | |
622 | unsigned long flags; | |
623 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); | |
624 | ||
625 | if (!desc) | |
626 | return -EINVAL; | |
627 | ||
628 | desc->parent_irq = parent_irq; | |
629 | ||
630 | irq_put_desc_unlock(desc, flags); | |
631 | return 0; | |
632 | } | |
633 | #endif | |
634 | ||
b25c340c TG |
635 | /* |
636 | * Default primary interrupt handler for threaded interrupts. Is | |
637 | * assigned as primary handler when request_threaded_irq is called | |
638 | * with handler == NULL. Useful for oneshot interrupts. | |
639 | */ | |
640 | static irqreturn_t irq_default_primary_handler(int irq, void *dev_id) | |
641 | { | |
642 | return IRQ_WAKE_THREAD; | |
643 | } | |
644 | ||
399b5da2 TG |
645 | /* |
646 | * Primary handler for nested threaded interrupts. Should never be | |
647 | * called. | |
648 | */ | |
649 | static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id) | |
650 | { | |
651 | WARN(1, "Primary handler called for nested irq %d\n", irq); | |
652 | return IRQ_NONE; | |
653 | } | |
654 | ||
3aa551c9 TG |
655 | static int irq_wait_for_interrupt(struct irqaction *action) |
656 | { | |
550acb19 IY |
657 | set_current_state(TASK_INTERRUPTIBLE); |
658 | ||
3aa551c9 | 659 | while (!kthread_should_stop()) { |
f48fe81e TG |
660 | |
661 | if (test_and_clear_bit(IRQTF_RUNTHREAD, | |
662 | &action->thread_flags)) { | |
3aa551c9 TG |
663 | __set_current_state(TASK_RUNNING); |
664 | return 0; | |
f48fe81e TG |
665 | } |
666 | schedule(); | |
550acb19 | 667 | set_current_state(TASK_INTERRUPTIBLE); |
3aa551c9 | 668 | } |
550acb19 | 669 | __set_current_state(TASK_RUNNING); |
3aa551c9 TG |
670 | return -1; |
671 | } | |
672 | ||
b25c340c TG |
673 | /* |
674 | * Oneshot interrupts keep the irq line masked until the threaded | |
675 | * handler finished. unmask if the interrupt has not been disabled and | |
676 | * is marked MASKED. | |
677 | */ | |
b5faba21 | 678 | static void irq_finalize_oneshot(struct irq_desc *desc, |
f3f79e38 | 679 | struct irqaction *action) |
b25c340c | 680 | { |
b5faba21 TG |
681 | if (!(desc->istate & IRQS_ONESHOT)) |
682 | return; | |
0b1adaa0 | 683 | again: |
3876ec9e | 684 | chip_bus_lock(desc); |
239007b8 | 685 | raw_spin_lock_irq(&desc->lock); |
0b1adaa0 TG |
686 | |
687 | /* | |
688 | * Implausible though it may be we need to protect us against | |
689 | * the following scenario: | |
690 | * | |
691 | * The thread is faster done than the hard interrupt handler | |
692 | * on the other CPU. If we unmask the irq line then the | |
693 | * interrupt can come in again and masks the line, leaves due | |
009b4c3b | 694 | * to IRQS_INPROGRESS and the irq line is masked forever. |
b5faba21 TG |
695 | * |
696 | * This also serializes the state of shared oneshot handlers | |
697 | * versus "desc->threads_onehsot |= action->thread_mask;" in | |
698 | * irq_wake_thread(). See the comment there which explains the | |
699 | * serialization. | |
0b1adaa0 | 700 | */ |
32f4125e | 701 | if (unlikely(irqd_irq_inprogress(&desc->irq_data))) { |
0b1adaa0 | 702 | raw_spin_unlock_irq(&desc->lock); |
3876ec9e | 703 | chip_bus_sync_unlock(desc); |
0b1adaa0 TG |
704 | cpu_relax(); |
705 | goto again; | |
706 | } | |
707 | ||
b5faba21 TG |
708 | /* |
709 | * Now check again, whether the thread should run. Otherwise | |
710 | * we would clear the threads_oneshot bit of this thread which | |
711 | * was just set. | |
712 | */ | |
f3f79e38 | 713 | if (test_bit(IRQTF_RUNTHREAD, &action->thread_flags)) |
b5faba21 TG |
714 | goto out_unlock; |
715 | ||
716 | desc->threads_oneshot &= ~action->thread_mask; | |
717 | ||
32f4125e TG |
718 | if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) && |
719 | irqd_irq_masked(&desc->irq_data)) | |
720 | unmask_irq(desc); | |
721 | ||
b5faba21 | 722 | out_unlock: |
239007b8 | 723 | raw_spin_unlock_irq(&desc->lock); |
3876ec9e | 724 | chip_bus_sync_unlock(desc); |
b25c340c TG |
725 | } |
726 | ||
61f38261 | 727 | #ifdef CONFIG_SMP |
591d2fb0 | 728 | /* |
d4d5e089 | 729 | * Check whether we need to chasnge the affinity of the interrupt thread. |
591d2fb0 TG |
730 | */ |
731 | static void | |
732 | irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) | |
733 | { | |
734 | cpumask_var_t mask; | |
735 | ||
736 | if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags)) | |
737 | return; | |
738 | ||
739 | /* | |
740 | * In case we are out of memory we set IRQTF_AFFINITY again and | |
741 | * try again next time | |
742 | */ | |
743 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { | |
744 | set_bit(IRQTF_AFFINITY, &action->thread_flags); | |
745 | return; | |
746 | } | |
747 | ||
239007b8 | 748 | raw_spin_lock_irq(&desc->lock); |
6b8ff312 | 749 | cpumask_copy(mask, desc->irq_data.affinity); |
239007b8 | 750 | raw_spin_unlock_irq(&desc->lock); |
591d2fb0 TG |
751 | |
752 | set_cpus_allowed_ptr(current, mask); | |
753 | free_cpumask_var(mask); | |
754 | } | |
61f38261 BP |
755 | #else |
756 | static inline void | |
757 | irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { } | |
758 | #endif | |
591d2fb0 | 759 | |
8d32a307 TG |
760 | /* |
761 | * Interrupts which are not explicitely requested as threaded | |
762 | * interrupts rely on the implicit bh/preempt disable of the hard irq | |
763 | * context. So we need to disable bh here to avoid deadlocks and other | |
764 | * side effects. | |
765 | */ | |
3a43e05f | 766 | static irqreturn_t |
8d32a307 TG |
767 | irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action) |
768 | { | |
3a43e05f SAS |
769 | irqreturn_t ret; |
770 | ||
8d32a307 | 771 | local_bh_disable(); |
3a43e05f | 772 | ret = action->thread_fn(action->irq, action->dev_id); |
f3f79e38 | 773 | irq_finalize_oneshot(desc, action); |
8d32a307 | 774 | local_bh_enable(); |
3a43e05f | 775 | return ret; |
8d32a307 TG |
776 | } |
777 | ||
778 | /* | |
779 | * Interrupts explicitely requested as threaded interupts want to be | |
780 | * preemtible - many of them need to sleep and wait for slow busses to | |
781 | * complete. | |
782 | */ | |
3a43e05f SAS |
783 | static irqreturn_t irq_thread_fn(struct irq_desc *desc, |
784 | struct irqaction *action) | |
8d32a307 | 785 | { |
3a43e05f SAS |
786 | irqreturn_t ret; |
787 | ||
788 | ret = action->thread_fn(action->irq, action->dev_id); | |
f3f79e38 | 789 | irq_finalize_oneshot(desc, action); |
3a43e05f | 790 | return ret; |
8d32a307 TG |
791 | } |
792 | ||
7140ea19 IY |
793 | static void wake_threads_waitq(struct irq_desc *desc) |
794 | { | |
795 | if (atomic_dec_and_test(&desc->threads_active) && | |
796 | waitqueue_active(&desc->wait_for_threads)) | |
797 | wake_up(&desc->wait_for_threads); | |
798 | } | |
799 | ||
67d12145 | 800 | static void irq_thread_dtor(struct callback_head *unused) |
4d1d61a6 ON |
801 | { |
802 | struct task_struct *tsk = current; | |
803 | struct irq_desc *desc; | |
804 | struct irqaction *action; | |
805 | ||
806 | if (WARN_ON_ONCE(!(current->flags & PF_EXITING))) | |
807 | return; | |
808 | ||
809 | action = kthread_data(tsk); | |
810 | ||
fb21affa | 811 | pr_err("exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n", |
4d1d61a6 ON |
812 | tsk->comm ? tsk->comm : "", tsk->pid, action->irq); |
813 | ||
814 | ||
815 | desc = irq_to_desc(action->irq); | |
816 | /* | |
817 | * If IRQTF_RUNTHREAD is set, we need to decrement | |
818 | * desc->threads_active and wake possible waiters. | |
819 | */ | |
820 | if (test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags)) | |
821 | wake_threads_waitq(desc); | |
822 | ||
823 | /* Prevent a stale desc->threads_oneshot */ | |
824 | irq_finalize_oneshot(desc, action); | |
825 | } | |
826 | ||
3aa551c9 TG |
827 | /* |
828 | * Interrupt handler thread | |
829 | */ | |
830 | static int irq_thread(void *data) | |
831 | { | |
67d12145 | 832 | struct callback_head on_exit_work; |
c9b5f501 | 833 | static const struct sched_param param = { |
fe7de49f KM |
834 | .sched_priority = MAX_USER_RT_PRIO/2, |
835 | }; | |
3aa551c9 TG |
836 | struct irqaction *action = data; |
837 | struct irq_desc *desc = irq_to_desc(action->irq); | |
3a43e05f SAS |
838 | irqreturn_t (*handler_fn)(struct irq_desc *desc, |
839 | struct irqaction *action); | |
3aa551c9 | 840 | |
540b60e2 | 841 | if (force_irqthreads && test_bit(IRQTF_FORCED_THREAD, |
8d32a307 TG |
842 | &action->thread_flags)) |
843 | handler_fn = irq_forced_thread_fn; | |
844 | else | |
845 | handler_fn = irq_thread_fn; | |
846 | ||
3aa551c9 | 847 | sched_setscheduler(current, SCHED_FIFO, ¶m); |
4d1d61a6 | 848 | |
41f9d29f | 849 | init_task_work(&on_exit_work, irq_thread_dtor); |
4d1d61a6 | 850 | task_work_add(current, &on_exit_work, false); |
3aa551c9 | 851 | |
f3de44ed SM |
852 | irq_thread_check_affinity(desc, action); |
853 | ||
3aa551c9 | 854 | while (!irq_wait_for_interrupt(action)) { |
7140ea19 | 855 | irqreturn_t action_ret; |
3aa551c9 | 856 | |
591d2fb0 TG |
857 | irq_thread_check_affinity(desc, action); |
858 | ||
7140ea19 IY |
859 | action_ret = handler_fn(desc, action); |
860 | if (!noirqdebug) | |
861 | note_interrupt(action->irq, desc, action_ret); | |
3aa551c9 | 862 | |
7140ea19 | 863 | wake_threads_waitq(desc); |
3aa551c9 TG |
864 | } |
865 | ||
7140ea19 IY |
866 | /* |
867 | * This is the regular exit path. __free_irq() is stopping the | |
868 | * thread via kthread_stop() after calling | |
869 | * synchronize_irq(). So neither IRQTF_RUNTHREAD nor the | |
e04268b0 TG |
870 | * oneshot mask bit can be set. We cannot verify that as we |
871 | * cannot touch the oneshot mask at this point anymore as | |
872 | * __setup_irq() might have given out currents thread_mask | |
873 | * again. | |
3aa551c9 | 874 | */ |
4d1d61a6 | 875 | task_work_cancel(current, irq_thread_dtor); |
3aa551c9 TG |
876 | return 0; |
877 | } | |
878 | ||
8d32a307 TG |
879 | static void irq_setup_forced_threading(struct irqaction *new) |
880 | { | |
881 | if (!force_irqthreads) | |
882 | return; | |
883 | if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT)) | |
884 | return; | |
885 | ||
886 | new->flags |= IRQF_ONESHOT; | |
887 | ||
888 | if (!new->thread_fn) { | |
889 | set_bit(IRQTF_FORCED_THREAD, &new->thread_flags); | |
890 | new->thread_fn = new->handler; | |
891 | new->handler = irq_default_primary_handler; | |
892 | } | |
893 | } | |
894 | ||
1da177e4 LT |
895 | /* |
896 | * Internal function to register an irqaction - typically used to | |
897 | * allocate special interrupts that are part of the architecture. | |
898 | */ | |
d3c60047 | 899 | static int |
327ec569 | 900 | __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) |
1da177e4 | 901 | { |
f17c7545 | 902 | struct irqaction *old, **old_ptr; |
b5faba21 | 903 | unsigned long flags, thread_mask = 0; |
3b8249e7 TG |
904 | int ret, nested, shared = 0; |
905 | cpumask_var_t mask; | |
1da177e4 | 906 | |
7d94f7ca | 907 | if (!desc) |
c2b5a251 MW |
908 | return -EINVAL; |
909 | ||
6b8ff312 | 910 | if (desc->irq_data.chip == &no_irq_chip) |
1da177e4 | 911 | return -ENOSYS; |
b6873807 SAS |
912 | if (!try_module_get(desc->owner)) |
913 | return -ENODEV; | |
1da177e4 | 914 | |
3aa551c9 | 915 | /* |
399b5da2 TG |
916 | * Check whether the interrupt nests into another interrupt |
917 | * thread. | |
918 | */ | |
1ccb4e61 | 919 | nested = irq_settings_is_nested_thread(desc); |
399b5da2 | 920 | if (nested) { |
b6873807 SAS |
921 | if (!new->thread_fn) { |
922 | ret = -EINVAL; | |
923 | goto out_mput; | |
924 | } | |
399b5da2 TG |
925 | /* |
926 | * Replace the primary handler which was provided from | |
927 | * the driver for non nested interrupt handling by the | |
928 | * dummy function which warns when called. | |
929 | */ | |
930 | new->handler = irq_nested_primary_handler; | |
8d32a307 | 931 | } else { |
7f1b1244 PM |
932 | if (irq_settings_can_thread(desc)) |
933 | irq_setup_forced_threading(new); | |
399b5da2 TG |
934 | } |
935 | ||
3aa551c9 | 936 | /* |
399b5da2 TG |
937 | * Create a handler thread when a thread function is supplied |
938 | * and the interrupt does not nest into another interrupt | |
939 | * thread. | |
3aa551c9 | 940 | */ |
399b5da2 | 941 | if (new->thread_fn && !nested) { |
3aa551c9 TG |
942 | struct task_struct *t; |
943 | ||
944 | t = kthread_create(irq_thread, new, "irq/%d-%s", irq, | |
945 | new->name); | |
b6873807 SAS |
946 | if (IS_ERR(t)) { |
947 | ret = PTR_ERR(t); | |
948 | goto out_mput; | |
949 | } | |
3aa551c9 TG |
950 | /* |
951 | * We keep the reference to the task struct even if | |
952 | * the thread dies to avoid that the interrupt code | |
953 | * references an already freed task_struct. | |
954 | */ | |
955 | get_task_struct(t); | |
956 | new->thread = t; | |
3aa551c9 TG |
957 | } |
958 | ||
3b8249e7 TG |
959 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { |
960 | ret = -ENOMEM; | |
961 | goto out_thread; | |
962 | } | |
963 | ||
dc9b229a TG |
964 | /* |
965 | * Drivers are often written to work w/o knowledge about the | |
966 | * underlying irq chip implementation, so a request for a | |
967 | * threaded irq without a primary hard irq context handler | |
968 | * requires the ONESHOT flag to be set. Some irq chips like | |
969 | * MSI based interrupts are per se one shot safe. Check the | |
970 | * chip flags, so we can avoid the unmask dance at the end of | |
971 | * the threaded handler for those. | |
972 | */ | |
973 | if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE) | |
974 | new->flags &= ~IRQF_ONESHOT; | |
975 | ||
1da177e4 LT |
976 | /* |
977 | * The following block of code has to be executed atomically | |
978 | */ | |
239007b8 | 979 | raw_spin_lock_irqsave(&desc->lock, flags); |
f17c7545 IM |
980 | old_ptr = &desc->action; |
981 | old = *old_ptr; | |
06fcb0c6 | 982 | if (old) { |
e76de9f8 TG |
983 | /* |
984 | * Can't share interrupts unless both agree to and are | |
985 | * the same type (level, edge, polarity). So both flag | |
3cca53b0 | 986 | * fields must have IRQF_SHARED set and the bits which |
9d591edd TG |
987 | * set the trigger type must match. Also all must |
988 | * agree on ONESHOT. | |
e76de9f8 | 989 | */ |
3cca53b0 | 990 | if (!((old->flags & new->flags) & IRQF_SHARED) || |
9d591edd | 991 | ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) || |
f5d89470 | 992 | ((old->flags ^ new->flags) & IRQF_ONESHOT)) |
f5163427 DS |
993 | goto mismatch; |
994 | ||
f5163427 | 995 | /* All handlers must agree on per-cpuness */ |
3cca53b0 TG |
996 | if ((old->flags & IRQF_PERCPU) != |
997 | (new->flags & IRQF_PERCPU)) | |
f5163427 | 998 | goto mismatch; |
1da177e4 LT |
999 | |
1000 | /* add new interrupt at end of irq queue */ | |
1001 | do { | |
52abb700 TG |
1002 | /* |
1003 | * Or all existing action->thread_mask bits, | |
1004 | * so we can find the next zero bit for this | |
1005 | * new action. | |
1006 | */ | |
b5faba21 | 1007 | thread_mask |= old->thread_mask; |
f17c7545 IM |
1008 | old_ptr = &old->next; |
1009 | old = *old_ptr; | |
1da177e4 LT |
1010 | } while (old); |
1011 | shared = 1; | |
1012 | } | |
1013 | ||
b5faba21 | 1014 | /* |
52abb700 TG |
1015 | * Setup the thread mask for this irqaction for ONESHOT. For |
1016 | * !ONESHOT irqs the thread mask is 0 so we can avoid a | |
1017 | * conditional in irq_wake_thread(). | |
b5faba21 | 1018 | */ |
52abb700 TG |
1019 | if (new->flags & IRQF_ONESHOT) { |
1020 | /* | |
1021 | * Unlikely to have 32 resp 64 irqs sharing one line, | |
1022 | * but who knows. | |
1023 | */ | |
1024 | if (thread_mask == ~0UL) { | |
1025 | ret = -EBUSY; | |
1026 | goto out_mask; | |
1027 | } | |
1028 | /* | |
1029 | * The thread_mask for the action is or'ed to | |
1030 | * desc->thread_active to indicate that the | |
1031 | * IRQF_ONESHOT thread handler has been woken, but not | |
1032 | * yet finished. The bit is cleared when a thread | |
1033 | * completes. When all threads of a shared interrupt | |
1034 | * line have completed desc->threads_active becomes | |
1035 | * zero and the interrupt line is unmasked. See | |
1036 | * handle.c:irq_wake_thread() for further information. | |
1037 | * | |
1038 | * If no thread is woken by primary (hard irq context) | |
1039 | * interrupt handlers, then desc->threads_active is | |
1040 | * also checked for zero to unmask the irq line in the | |
1041 | * affected hard irq flow handlers | |
1042 | * (handle_[fasteoi|level]_irq). | |
1043 | * | |
1044 | * The new action gets the first zero bit of | |
1045 | * thread_mask assigned. See the loop above which or's | |
1046 | * all existing action->thread_mask bits. | |
1047 | */ | |
1048 | new->thread_mask = 1 << ffz(thread_mask); | |
1c6c6952 | 1049 | |
dc9b229a TG |
1050 | } else if (new->handler == irq_default_primary_handler && |
1051 | !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) { | |
1c6c6952 TG |
1052 | /* |
1053 | * The interrupt was requested with handler = NULL, so | |
1054 | * we use the default primary handler for it. But it | |
1055 | * does not have the oneshot flag set. In combination | |
1056 | * with level interrupts this is deadly, because the | |
1057 | * default primary handler just wakes the thread, then | |
1058 | * the irq lines is reenabled, but the device still | |
1059 | * has the level irq asserted. Rinse and repeat.... | |
1060 | * | |
1061 | * While this works for edge type interrupts, we play | |
1062 | * it safe and reject unconditionally because we can't | |
1063 | * say for sure which type this interrupt really | |
1064 | * has. The type flags are unreliable as the | |
1065 | * underlying chip implementation can override them. | |
1066 | */ | |
97fd75b7 | 1067 | pr_err("Threaded irq requested with handler=NULL and !ONESHOT for irq %d\n", |
1c6c6952 TG |
1068 | irq); |
1069 | ret = -EINVAL; | |
1070 | goto out_mask; | |
b5faba21 | 1071 | } |
b5faba21 | 1072 | |
1da177e4 | 1073 | if (!shared) { |
3aa551c9 TG |
1074 | init_waitqueue_head(&desc->wait_for_threads); |
1075 | ||
e76de9f8 | 1076 | /* Setup the type (level, edge polarity) if configured: */ |
3cca53b0 | 1077 | if (new->flags & IRQF_TRIGGER_MASK) { |
f2b662da DB |
1078 | ret = __irq_set_trigger(desc, irq, |
1079 | new->flags & IRQF_TRIGGER_MASK); | |
82736f4d | 1080 | |
3aa551c9 | 1081 | if (ret) |
3b8249e7 | 1082 | goto out_mask; |
091738a2 | 1083 | } |
6a6de9ef | 1084 | |
009b4c3b | 1085 | desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \ |
32f4125e TG |
1086 | IRQS_ONESHOT | IRQS_WAITING); |
1087 | irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS); | |
94d39e1f | 1088 | |
a005677b TG |
1089 | if (new->flags & IRQF_PERCPU) { |
1090 | irqd_set(&desc->irq_data, IRQD_PER_CPU); | |
1091 | irq_settings_set_per_cpu(desc); | |
1092 | } | |
6a58fb3b | 1093 | |
b25c340c | 1094 | if (new->flags & IRQF_ONESHOT) |
3d67baec | 1095 | desc->istate |= IRQS_ONESHOT; |
b25c340c | 1096 | |
1ccb4e61 | 1097 | if (irq_settings_can_autoenable(desc)) |
b4bc724e | 1098 | irq_startup(desc, true); |
46999238 | 1099 | else |
e76de9f8 TG |
1100 | /* Undo nested disables: */ |
1101 | desc->depth = 1; | |
18404756 | 1102 | |
612e3684 | 1103 | /* Exclude IRQ from balancing if requested */ |
a005677b TG |
1104 | if (new->flags & IRQF_NOBALANCING) { |
1105 | irq_settings_set_no_balancing(desc); | |
1106 | irqd_set(&desc->irq_data, IRQD_NO_BALANCING); | |
1107 | } | |
612e3684 | 1108 | |
18404756 | 1109 | /* Set default affinity mask once everything is setup */ |
3b8249e7 | 1110 | setup_affinity(irq, desc, mask); |
0c5d1eb7 | 1111 | |
876dbd4c TG |
1112 | } else if (new->flags & IRQF_TRIGGER_MASK) { |
1113 | unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK; | |
1114 | unsigned int omsk = irq_settings_get_trigger_mask(desc); | |
1115 | ||
1116 | if (nmsk != omsk) | |
1117 | /* hope the handler works with current trigger mode */ | |
97fd75b7 | 1118 | pr_warning("irq %d uses trigger mode %u; requested %u\n", |
876dbd4c | 1119 | irq, nmsk, omsk); |
1da177e4 | 1120 | } |
82736f4d | 1121 | |
69ab8494 | 1122 | new->irq = irq; |
f17c7545 | 1123 | *old_ptr = new; |
82736f4d | 1124 | |
8528b0f1 LT |
1125 | /* Reset broken irq detection when installing new handler */ |
1126 | desc->irq_count = 0; | |
1127 | desc->irqs_unhandled = 0; | |
1adb0850 TG |
1128 | |
1129 | /* | |
1130 | * Check whether we disabled the irq via the spurious handler | |
1131 | * before. Reenable it and give it another chance. | |
1132 | */ | |
7acdd53e TG |
1133 | if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) { |
1134 | desc->istate &= ~IRQS_SPURIOUS_DISABLED; | |
0a0c5168 | 1135 | __enable_irq(desc, irq, false); |
1adb0850 TG |
1136 | } |
1137 | ||
239007b8 | 1138 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
1da177e4 | 1139 | |
69ab8494 TG |
1140 | /* |
1141 | * Strictly no need to wake it up, but hung_task complains | |
1142 | * when no hard interrupt wakes the thread up. | |
1143 | */ | |
1144 | if (new->thread) | |
1145 | wake_up_process(new->thread); | |
1146 | ||
2c6927a3 | 1147 | register_irq_proc(irq, desc); |
1da177e4 LT |
1148 | new->dir = NULL; |
1149 | register_handler_proc(irq, new); | |
4f5058c3 | 1150 | free_cpumask_var(mask); |
1da177e4 LT |
1151 | |
1152 | return 0; | |
f5163427 DS |
1153 | |
1154 | mismatch: | |
3cca53b0 | 1155 | if (!(new->flags & IRQF_PROBE_SHARED)) { |
97fd75b7 | 1156 | pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n", |
f5d89470 TG |
1157 | irq, new->flags, new->name, old->flags, old->name); |
1158 | #ifdef CONFIG_DEBUG_SHIRQ | |
13e87ec6 | 1159 | dump_stack(); |
3f050447 | 1160 | #endif |
f5d89470 | 1161 | } |
3aa551c9 TG |
1162 | ret = -EBUSY; |
1163 | ||
3b8249e7 | 1164 | out_mask: |
1c389795 | 1165 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
3b8249e7 TG |
1166 | free_cpumask_var(mask); |
1167 | ||
3aa551c9 | 1168 | out_thread: |
3aa551c9 TG |
1169 | if (new->thread) { |
1170 | struct task_struct *t = new->thread; | |
1171 | ||
1172 | new->thread = NULL; | |
05d74efa | 1173 | kthread_stop(t); |
3aa551c9 TG |
1174 | put_task_struct(t); |
1175 | } | |
b6873807 SAS |
1176 | out_mput: |
1177 | module_put(desc->owner); | |
3aa551c9 | 1178 | return ret; |
1da177e4 LT |
1179 | } |
1180 | ||
d3c60047 TG |
1181 | /** |
1182 | * setup_irq - setup an interrupt | |
1183 | * @irq: Interrupt line to setup | |
1184 | * @act: irqaction for the interrupt | |
1185 | * | |
1186 | * Used to statically setup interrupts in the early boot process. | |
1187 | */ | |
1188 | int setup_irq(unsigned int irq, struct irqaction *act) | |
1189 | { | |
986c011d | 1190 | int retval; |
d3c60047 TG |
1191 | struct irq_desc *desc = irq_to_desc(irq); |
1192 | ||
31d9d9b6 MZ |
1193 | if (WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
1194 | return -EINVAL; | |
986c011d DD |
1195 | chip_bus_lock(desc); |
1196 | retval = __setup_irq(irq, desc, act); | |
1197 | chip_bus_sync_unlock(desc); | |
1198 | ||
1199 | return retval; | |
d3c60047 | 1200 | } |
eb53b4e8 | 1201 | EXPORT_SYMBOL_GPL(setup_irq); |
d3c60047 | 1202 | |
31d9d9b6 | 1203 | /* |
cbf94f06 MD |
1204 | * Internal function to unregister an irqaction - used to free |
1205 | * regular and special interrupts that are part of the architecture. | |
1da177e4 | 1206 | */ |
cbf94f06 | 1207 | static struct irqaction *__free_irq(unsigned int irq, void *dev_id) |
1da177e4 | 1208 | { |
d3c60047 | 1209 | struct irq_desc *desc = irq_to_desc(irq); |
f17c7545 | 1210 | struct irqaction *action, **action_ptr; |
1da177e4 LT |
1211 | unsigned long flags; |
1212 | ||
ae88a23b | 1213 | WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq); |
7d94f7ca | 1214 | |
7d94f7ca | 1215 | if (!desc) |
f21cfb25 | 1216 | return NULL; |
1da177e4 | 1217 | |
239007b8 | 1218 | raw_spin_lock_irqsave(&desc->lock, flags); |
ae88a23b IM |
1219 | |
1220 | /* | |
1221 | * There can be multiple actions per IRQ descriptor, find the right | |
1222 | * one based on the dev_id: | |
1223 | */ | |
f17c7545 | 1224 | action_ptr = &desc->action; |
1da177e4 | 1225 | for (;;) { |
f17c7545 | 1226 | action = *action_ptr; |
1da177e4 | 1227 | |
ae88a23b IM |
1228 | if (!action) { |
1229 | WARN(1, "Trying to free already-free IRQ %d\n", irq); | |
239007b8 | 1230 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
1da177e4 | 1231 | |
f21cfb25 | 1232 | return NULL; |
ae88a23b | 1233 | } |
1da177e4 | 1234 | |
8316e381 IM |
1235 | if (action->dev_id == dev_id) |
1236 | break; | |
f17c7545 | 1237 | action_ptr = &action->next; |
ae88a23b | 1238 | } |
dbce706e | 1239 | |
ae88a23b | 1240 | /* Found it - now remove it from the list of entries: */ |
f17c7545 | 1241 | *action_ptr = action->next; |
ae88a23b | 1242 | |
ae88a23b | 1243 | /* If this was the last handler, shut down the IRQ line: */ |
46999238 TG |
1244 | if (!desc->action) |
1245 | irq_shutdown(desc); | |
3aa551c9 | 1246 | |
e7a297b0 PWJ |
1247 | #ifdef CONFIG_SMP |
1248 | /* make sure affinity_hint is cleaned up */ | |
1249 | if (WARN_ON_ONCE(desc->affinity_hint)) | |
1250 | desc->affinity_hint = NULL; | |
1251 | #endif | |
1252 | ||
239007b8 | 1253 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
ae88a23b IM |
1254 | |
1255 | unregister_handler_proc(irq, action); | |
1256 | ||
1257 | /* Make sure it's not being used on another CPU: */ | |
1258 | synchronize_irq(irq); | |
1da177e4 | 1259 | |
70edcd77 | 1260 | #ifdef CONFIG_DEBUG_SHIRQ |
ae88a23b IM |
1261 | /* |
1262 | * It's a shared IRQ -- the driver ought to be prepared for an IRQ | |
1263 | * event to happen even now it's being freed, so let's make sure that | |
1264 | * is so by doing an extra call to the handler .... | |
1265 | * | |
1266 | * ( We do this after actually deregistering it, to make sure that a | |
1267 | * 'real' IRQ doesn't run in * parallel with our fake. ) | |
1268 | */ | |
1269 | if (action->flags & IRQF_SHARED) { | |
1270 | local_irq_save(flags); | |
1271 | action->handler(irq, dev_id); | |
1272 | local_irq_restore(flags); | |
1da177e4 | 1273 | } |
ae88a23b | 1274 | #endif |
2d860ad7 LT |
1275 | |
1276 | if (action->thread) { | |
05d74efa | 1277 | kthread_stop(action->thread); |
2d860ad7 LT |
1278 | put_task_struct(action->thread); |
1279 | } | |
1280 | ||
b6873807 | 1281 | module_put(desc->owner); |
f21cfb25 MD |
1282 | return action; |
1283 | } | |
1284 | ||
cbf94f06 MD |
1285 | /** |
1286 | * remove_irq - free an interrupt | |
1287 | * @irq: Interrupt line to free | |
1288 | * @act: irqaction for the interrupt | |
1289 | * | |
1290 | * Used to remove interrupts statically setup by the early boot process. | |
1291 | */ | |
1292 | void remove_irq(unsigned int irq, struct irqaction *act) | |
1293 | { | |
31d9d9b6 MZ |
1294 | struct irq_desc *desc = irq_to_desc(irq); |
1295 | ||
1296 | if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc))) | |
1297 | __free_irq(irq, act->dev_id); | |
cbf94f06 | 1298 | } |
eb53b4e8 | 1299 | EXPORT_SYMBOL_GPL(remove_irq); |
cbf94f06 | 1300 | |
f21cfb25 MD |
1301 | /** |
1302 | * free_irq - free an interrupt allocated with request_irq | |
1303 | * @irq: Interrupt line to free | |
1304 | * @dev_id: Device identity to free | |
1305 | * | |
1306 | * Remove an interrupt handler. The handler is removed and if the | |
1307 | * interrupt line is no longer in use by any driver it is disabled. | |
1308 | * On a shared IRQ the caller must ensure the interrupt is disabled | |
1309 | * on the card it drives before calling this function. The function | |
1310 | * does not return until any executing interrupts for this IRQ | |
1311 | * have completed. | |
1312 | * | |
1313 | * This function must not be called from interrupt context. | |
1314 | */ | |
1315 | void free_irq(unsigned int irq, void *dev_id) | |
1316 | { | |
70aedd24 TG |
1317 | struct irq_desc *desc = irq_to_desc(irq); |
1318 | ||
31d9d9b6 | 1319 | if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
70aedd24 TG |
1320 | return; |
1321 | ||
cd7eab44 BH |
1322 | #ifdef CONFIG_SMP |
1323 | if (WARN_ON(desc->affinity_notify)) | |
1324 | desc->affinity_notify = NULL; | |
1325 | #endif | |
1326 | ||
3876ec9e | 1327 | chip_bus_lock(desc); |
cbf94f06 | 1328 | kfree(__free_irq(irq, dev_id)); |
3876ec9e | 1329 | chip_bus_sync_unlock(desc); |
1da177e4 | 1330 | } |
1da177e4 LT |
1331 | EXPORT_SYMBOL(free_irq); |
1332 | ||
1333 | /** | |
3aa551c9 | 1334 | * request_threaded_irq - allocate an interrupt line |
1da177e4 | 1335 | * @irq: Interrupt line to allocate |
3aa551c9 TG |
1336 | * @handler: Function to be called when the IRQ occurs. |
1337 | * Primary handler for threaded interrupts | |
b25c340c TG |
1338 | * If NULL and thread_fn != NULL the default |
1339 | * primary handler is installed | |
f48fe81e TG |
1340 | * @thread_fn: Function called from the irq handler thread |
1341 | * If NULL, no irq thread is created | |
1da177e4 LT |
1342 | * @irqflags: Interrupt type flags |
1343 | * @devname: An ascii name for the claiming device | |
1344 | * @dev_id: A cookie passed back to the handler function | |
1345 | * | |
1346 | * This call allocates interrupt resources and enables the | |
1347 | * interrupt line and IRQ handling. From the point this | |
1348 | * call is made your handler function may be invoked. Since | |
1349 | * your handler function must clear any interrupt the board | |
1350 | * raises, you must take care both to initialise your hardware | |
1351 | * and to set up the interrupt handler in the right order. | |
1352 | * | |
3aa551c9 | 1353 | * If you want to set up a threaded irq handler for your device |
6d21af4f | 1354 | * then you need to supply @handler and @thread_fn. @handler is |
3aa551c9 TG |
1355 | * still called in hard interrupt context and has to check |
1356 | * whether the interrupt originates from the device. If yes it | |
1357 | * needs to disable the interrupt on the device and return | |
39a2eddb | 1358 | * IRQ_WAKE_THREAD which will wake up the handler thread and run |
3aa551c9 TG |
1359 | * @thread_fn. This split handler design is necessary to support |
1360 | * shared interrupts. | |
1361 | * | |
1da177e4 LT |
1362 | * Dev_id must be globally unique. Normally the address of the |
1363 | * device data structure is used as the cookie. Since the handler | |
1364 | * receives this value it makes sense to use it. | |
1365 | * | |
1366 | * If your interrupt is shared you must pass a non NULL dev_id | |
1367 | * as this is required when freeing the interrupt. | |
1368 | * | |
1369 | * Flags: | |
1370 | * | |
3cca53b0 | 1371 | * IRQF_SHARED Interrupt is shared |
0c5d1eb7 | 1372 | * IRQF_TRIGGER_* Specify active edge(s) or level |
1da177e4 LT |
1373 | * |
1374 | */ | |
3aa551c9 TG |
1375 | int request_threaded_irq(unsigned int irq, irq_handler_t handler, |
1376 | irq_handler_t thread_fn, unsigned long irqflags, | |
1377 | const char *devname, void *dev_id) | |
1da177e4 | 1378 | { |
06fcb0c6 | 1379 | struct irqaction *action; |
08678b08 | 1380 | struct irq_desc *desc; |
d3c60047 | 1381 | int retval; |
1da177e4 LT |
1382 | |
1383 | /* | |
1384 | * Sanity-check: shared interrupts must pass in a real dev-ID, | |
1385 | * otherwise we'll have trouble later trying to figure out | |
1386 | * which interrupt is which (messes up the interrupt freeing | |
1387 | * logic etc). | |
1388 | */ | |
3cca53b0 | 1389 | if ((irqflags & IRQF_SHARED) && !dev_id) |
1da177e4 | 1390 | return -EINVAL; |
7d94f7ca | 1391 | |
cb5bc832 | 1392 | desc = irq_to_desc(irq); |
7d94f7ca | 1393 | if (!desc) |
1da177e4 | 1394 | return -EINVAL; |
7d94f7ca | 1395 | |
31d9d9b6 MZ |
1396 | if (!irq_settings_can_request(desc) || |
1397 | WARN_ON(irq_settings_is_per_cpu_devid(desc))) | |
6550c775 | 1398 | return -EINVAL; |
b25c340c TG |
1399 | |
1400 | if (!handler) { | |
1401 | if (!thread_fn) | |
1402 | return -EINVAL; | |
1403 | handler = irq_default_primary_handler; | |
1404 | } | |
1da177e4 | 1405 | |
45535732 | 1406 | action = kzalloc(sizeof(struct irqaction), GFP_KERNEL); |
1da177e4 LT |
1407 | if (!action) |
1408 | return -ENOMEM; | |
1409 | ||
1410 | action->handler = handler; | |
3aa551c9 | 1411 | action->thread_fn = thread_fn; |
1da177e4 | 1412 | action->flags = irqflags; |
1da177e4 | 1413 | action->name = devname; |
1da177e4 LT |
1414 | action->dev_id = dev_id; |
1415 | ||
3876ec9e | 1416 | chip_bus_lock(desc); |
d3c60047 | 1417 | retval = __setup_irq(irq, desc, action); |
3876ec9e | 1418 | chip_bus_sync_unlock(desc); |
70aedd24 | 1419 | |
377bf1e4 AV |
1420 | if (retval) |
1421 | kfree(action); | |
1422 | ||
6d83f94d | 1423 | #ifdef CONFIG_DEBUG_SHIRQ_FIXME |
6ce51c43 | 1424 | if (!retval && (irqflags & IRQF_SHARED)) { |
a304e1b8 DW |
1425 | /* |
1426 | * It's a shared IRQ -- the driver ought to be prepared for it | |
1427 | * to happen immediately, so let's make sure.... | |
377bf1e4 AV |
1428 | * We disable the irq to make sure that a 'real' IRQ doesn't |
1429 | * run in parallel with our fake. | |
a304e1b8 | 1430 | */ |
59845b1f | 1431 | unsigned long flags; |
a304e1b8 | 1432 | |
377bf1e4 | 1433 | disable_irq(irq); |
59845b1f | 1434 | local_irq_save(flags); |
377bf1e4 | 1435 | |
59845b1f | 1436 | handler(irq, dev_id); |
377bf1e4 | 1437 | |
59845b1f | 1438 | local_irq_restore(flags); |
377bf1e4 | 1439 | enable_irq(irq); |
a304e1b8 DW |
1440 | } |
1441 | #endif | |
1da177e4 LT |
1442 | return retval; |
1443 | } | |
3aa551c9 | 1444 | EXPORT_SYMBOL(request_threaded_irq); |
ae731f8d MZ |
1445 | |
1446 | /** | |
1447 | * request_any_context_irq - allocate an interrupt line | |
1448 | * @irq: Interrupt line to allocate | |
1449 | * @handler: Function to be called when the IRQ occurs. | |
1450 | * Threaded handler for threaded interrupts. | |
1451 | * @flags: Interrupt type flags | |
1452 | * @name: An ascii name for the claiming device | |
1453 | * @dev_id: A cookie passed back to the handler function | |
1454 | * | |
1455 | * This call allocates interrupt resources and enables the | |
1456 | * interrupt line and IRQ handling. It selects either a | |
1457 | * hardirq or threaded handling method depending on the | |
1458 | * context. | |
1459 | * | |
1460 | * On failure, it returns a negative value. On success, | |
1461 | * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED. | |
1462 | */ | |
1463 | int request_any_context_irq(unsigned int irq, irq_handler_t handler, | |
1464 | unsigned long flags, const char *name, void *dev_id) | |
1465 | { | |
1466 | struct irq_desc *desc = irq_to_desc(irq); | |
1467 | int ret; | |
1468 | ||
1469 | if (!desc) | |
1470 | return -EINVAL; | |
1471 | ||
1ccb4e61 | 1472 | if (irq_settings_is_nested_thread(desc)) { |
ae731f8d MZ |
1473 | ret = request_threaded_irq(irq, NULL, handler, |
1474 | flags, name, dev_id); | |
1475 | return !ret ? IRQC_IS_NESTED : ret; | |
1476 | } | |
1477 | ||
1478 | ret = request_irq(irq, handler, flags, name, dev_id); | |
1479 | return !ret ? IRQC_IS_HARDIRQ : ret; | |
1480 | } | |
1481 | EXPORT_SYMBOL_GPL(request_any_context_irq); | |
31d9d9b6 | 1482 | |
1e7c5fd2 | 1483 | void enable_percpu_irq(unsigned int irq, unsigned int type) |
31d9d9b6 MZ |
1484 | { |
1485 | unsigned int cpu = smp_processor_id(); | |
1486 | unsigned long flags; | |
1487 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); | |
1488 | ||
1489 | if (!desc) | |
1490 | return; | |
1491 | ||
1e7c5fd2 MZ |
1492 | type &= IRQ_TYPE_SENSE_MASK; |
1493 | if (type != IRQ_TYPE_NONE) { | |
1494 | int ret; | |
1495 | ||
1496 | ret = __irq_set_trigger(desc, irq, type); | |
1497 | ||
1498 | if (ret) { | |
32cffdde | 1499 | WARN(1, "failed to set type for IRQ%d\n", irq); |
1e7c5fd2 MZ |
1500 | goto out; |
1501 | } | |
1502 | } | |
1503 | ||
31d9d9b6 | 1504 | irq_percpu_enable(desc, cpu); |
1e7c5fd2 | 1505 | out: |
31d9d9b6 MZ |
1506 | irq_put_desc_unlock(desc, flags); |
1507 | } | |
1508 | ||
1509 | void disable_percpu_irq(unsigned int irq) | |
1510 | { | |
1511 | unsigned int cpu = smp_processor_id(); | |
1512 | unsigned long flags; | |
1513 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); | |
1514 | ||
1515 | if (!desc) | |
1516 | return; | |
1517 | ||
1518 | irq_percpu_disable(desc, cpu); | |
1519 | irq_put_desc_unlock(desc, flags); | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * Internal function to unregister a percpu irqaction. | |
1524 | */ | |
1525 | static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id) | |
1526 | { | |
1527 | struct irq_desc *desc = irq_to_desc(irq); | |
1528 | struct irqaction *action; | |
1529 | unsigned long flags; | |
1530 | ||
1531 | WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq); | |
1532 | ||
1533 | if (!desc) | |
1534 | return NULL; | |
1535 | ||
1536 | raw_spin_lock_irqsave(&desc->lock, flags); | |
1537 | ||
1538 | action = desc->action; | |
1539 | if (!action || action->percpu_dev_id != dev_id) { | |
1540 | WARN(1, "Trying to free already-free IRQ %d\n", irq); | |
1541 | goto bad; | |
1542 | } | |
1543 | ||
1544 | if (!cpumask_empty(desc->percpu_enabled)) { | |
1545 | WARN(1, "percpu IRQ %d still enabled on CPU%d!\n", | |
1546 | irq, cpumask_first(desc->percpu_enabled)); | |
1547 | goto bad; | |
1548 | } | |
1549 | ||
1550 | /* Found it - now remove it from the list of entries: */ | |
1551 | desc->action = NULL; | |
1552 | ||
1553 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
1554 | ||
1555 | unregister_handler_proc(irq, action); | |
1556 | ||
1557 | module_put(desc->owner); | |
1558 | return action; | |
1559 | ||
1560 | bad: | |
1561 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
1562 | return NULL; | |
1563 | } | |
1564 | ||
1565 | /** | |
1566 | * remove_percpu_irq - free a per-cpu interrupt | |
1567 | * @irq: Interrupt line to free | |
1568 | * @act: irqaction for the interrupt | |
1569 | * | |
1570 | * Used to remove interrupts statically setup by the early boot process. | |
1571 | */ | |
1572 | void remove_percpu_irq(unsigned int irq, struct irqaction *act) | |
1573 | { | |
1574 | struct irq_desc *desc = irq_to_desc(irq); | |
1575 | ||
1576 | if (desc && irq_settings_is_per_cpu_devid(desc)) | |
1577 | __free_percpu_irq(irq, act->percpu_dev_id); | |
1578 | } | |
1579 | ||
1580 | /** | |
1581 | * free_percpu_irq - free an interrupt allocated with request_percpu_irq | |
1582 | * @irq: Interrupt line to free | |
1583 | * @dev_id: Device identity to free | |
1584 | * | |
1585 | * Remove a percpu interrupt handler. The handler is removed, but | |
1586 | * the interrupt line is not disabled. This must be done on each | |
1587 | * CPU before calling this function. The function does not return | |
1588 | * until any executing interrupts for this IRQ have completed. | |
1589 | * | |
1590 | * This function must not be called from interrupt context. | |
1591 | */ | |
1592 | void free_percpu_irq(unsigned int irq, void __percpu *dev_id) | |
1593 | { | |
1594 | struct irq_desc *desc = irq_to_desc(irq); | |
1595 | ||
1596 | if (!desc || !irq_settings_is_per_cpu_devid(desc)) | |
1597 | return; | |
1598 | ||
1599 | chip_bus_lock(desc); | |
1600 | kfree(__free_percpu_irq(irq, dev_id)); | |
1601 | chip_bus_sync_unlock(desc); | |
1602 | } | |
1603 | ||
1604 | /** | |
1605 | * setup_percpu_irq - setup a per-cpu interrupt | |
1606 | * @irq: Interrupt line to setup | |
1607 | * @act: irqaction for the interrupt | |
1608 | * | |
1609 | * Used to statically setup per-cpu interrupts in the early boot process. | |
1610 | */ | |
1611 | int setup_percpu_irq(unsigned int irq, struct irqaction *act) | |
1612 | { | |
1613 | struct irq_desc *desc = irq_to_desc(irq); | |
1614 | int retval; | |
1615 | ||
1616 | if (!desc || !irq_settings_is_per_cpu_devid(desc)) | |
1617 | return -EINVAL; | |
1618 | chip_bus_lock(desc); | |
1619 | retval = __setup_irq(irq, desc, act); | |
1620 | chip_bus_sync_unlock(desc); | |
1621 | ||
1622 | return retval; | |
1623 | } | |
1624 | ||
1625 | /** | |
1626 | * request_percpu_irq - allocate a percpu interrupt line | |
1627 | * @irq: Interrupt line to allocate | |
1628 | * @handler: Function to be called when the IRQ occurs. | |
1629 | * @devname: An ascii name for the claiming device | |
1630 | * @dev_id: A percpu cookie passed back to the handler function | |
1631 | * | |
1632 | * This call allocates interrupt resources, but doesn't | |
1633 | * automatically enable the interrupt. It has to be done on each | |
1634 | * CPU using enable_percpu_irq(). | |
1635 | * | |
1636 | * Dev_id must be globally unique. It is a per-cpu variable, and | |
1637 | * the handler gets called with the interrupted CPU's instance of | |
1638 | * that variable. | |
1639 | */ | |
1640 | int request_percpu_irq(unsigned int irq, irq_handler_t handler, | |
1641 | const char *devname, void __percpu *dev_id) | |
1642 | { | |
1643 | struct irqaction *action; | |
1644 | struct irq_desc *desc; | |
1645 | int retval; | |
1646 | ||
1647 | if (!dev_id) | |
1648 | return -EINVAL; | |
1649 | ||
1650 | desc = irq_to_desc(irq); | |
1651 | if (!desc || !irq_settings_can_request(desc) || | |
1652 | !irq_settings_is_per_cpu_devid(desc)) | |
1653 | return -EINVAL; | |
1654 | ||
1655 | action = kzalloc(sizeof(struct irqaction), GFP_KERNEL); | |
1656 | if (!action) | |
1657 | return -ENOMEM; | |
1658 | ||
1659 | action->handler = handler; | |
2ed0e645 | 1660 | action->flags = IRQF_PERCPU | IRQF_NO_SUSPEND; |
31d9d9b6 MZ |
1661 | action->name = devname; |
1662 | action->percpu_dev_id = dev_id; | |
1663 | ||
1664 | chip_bus_lock(desc); | |
1665 | retval = __setup_irq(irq, desc, action); | |
1666 | chip_bus_sync_unlock(desc); | |
1667 | ||
1668 | if (retval) | |
1669 | kfree(action); | |
1670 | ||
1671 | return retval; | |
1672 | } |