Commit | Line | Data |
---|---|---|
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> |
8bd75c77 | 19 | #include <linux/sched/rt.h> |
0881e7bd | 20 | #include <linux/sched/task.h> |
ae7e81c0 | 21 | #include <uapi/linux/sched/types.h> |
4d1d61a6 | 22 | #include <linux/task_work.h> |
1da177e4 LT |
23 | |
24 | #include "internals.h" | |
25 | ||
8d32a307 TG |
26 | #ifdef CONFIG_IRQ_FORCED_THREADING |
27 | __read_mostly bool force_irqthreads; | |
28 | ||
29 | static int __init setup_forced_irqthreads(char *arg) | |
30 | { | |
31 | force_irqthreads = true; | |
32 | return 0; | |
33 | } | |
34 | early_param("threadirqs", setup_forced_irqthreads); | |
35 | #endif | |
36 | ||
18258f72 | 37 | static void __synchronize_hardirq(struct irq_desc *desc) |
1da177e4 | 38 | { |
32f4125e | 39 | bool inprogress; |
1da177e4 | 40 | |
a98ce5c6 HX |
41 | do { |
42 | unsigned long flags; | |
43 | ||
44 | /* | |
45 | * Wait until we're out of the critical section. This might | |
46 | * give the wrong answer due to the lack of memory barriers. | |
47 | */ | |
32f4125e | 48 | while (irqd_irq_inprogress(&desc->irq_data)) |
a98ce5c6 HX |
49 | cpu_relax(); |
50 | ||
51 | /* Ok, that indicated we're done: double-check carefully. */ | |
239007b8 | 52 | raw_spin_lock_irqsave(&desc->lock, flags); |
32f4125e | 53 | inprogress = irqd_irq_inprogress(&desc->irq_data); |
239007b8 | 54 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
a98ce5c6 HX |
55 | |
56 | /* Oops, that failed? */ | |
32f4125e | 57 | } while (inprogress); |
18258f72 TG |
58 | } |
59 | ||
60 | /** | |
61 | * synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs) | |
62 | * @irq: interrupt number to wait for | |
63 | * | |
64 | * This function waits for any pending hard IRQ handlers for this | |
65 | * interrupt to complete before returning. If you use this | |
66 | * function while holding a resource the IRQ handler may need you | |
67 | * will deadlock. It does not take associated threaded handlers | |
68 | * into account. | |
69 | * | |
70 | * Do not use this for shutdown scenarios where you must be sure | |
71 | * that all parts (hardirq and threaded handler) have completed. | |
72 | * | |
02cea395 PZ |
73 | * Returns: false if a threaded handler is active. |
74 | * | |
18258f72 TG |
75 | * This function may be called - with care - from IRQ context. |
76 | */ | |
02cea395 | 77 | bool synchronize_hardirq(unsigned int irq) |
18258f72 TG |
78 | { |
79 | struct irq_desc *desc = irq_to_desc(irq); | |
3aa551c9 | 80 | |
02cea395 | 81 | if (desc) { |
18258f72 | 82 | __synchronize_hardirq(desc); |
02cea395 PZ |
83 | return !atomic_read(&desc->threads_active); |
84 | } | |
85 | ||
86 | return true; | |
18258f72 TG |
87 | } |
88 | EXPORT_SYMBOL(synchronize_hardirq); | |
89 | ||
90 | /** | |
91 | * synchronize_irq - wait for pending IRQ handlers (on other CPUs) | |
92 | * @irq: interrupt number to wait for | |
93 | * | |
94 | * This function waits for any pending IRQ handlers for this interrupt | |
95 | * to complete before returning. If you use this function while | |
96 | * holding a resource the IRQ handler may need you will deadlock. | |
97 | * | |
98 | * This function may be called - with care - from IRQ context. | |
99 | */ | |
100 | void synchronize_irq(unsigned int irq) | |
101 | { | |
102 | struct irq_desc *desc = irq_to_desc(irq); | |
103 | ||
104 | if (desc) { | |
105 | __synchronize_hardirq(desc); | |
106 | /* | |
107 | * We made sure that no hardirq handler is | |
108 | * running. Now verify that no threaded handlers are | |
109 | * active. | |
110 | */ | |
111 | wait_event(desc->wait_for_threads, | |
112 | !atomic_read(&desc->threads_active)); | |
113 | } | |
1da177e4 | 114 | } |
1da177e4 LT |
115 | EXPORT_SYMBOL(synchronize_irq); |
116 | ||
3aa551c9 TG |
117 | #ifdef CONFIG_SMP |
118 | cpumask_var_t irq_default_affinity; | |
119 | ||
9c255583 | 120 | static bool __irq_can_set_affinity(struct irq_desc *desc) |
e019c249 JL |
121 | { |
122 | if (!desc || !irqd_can_balance(&desc->irq_data) || | |
123 | !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity) | |
9c255583 TG |
124 | return false; |
125 | return true; | |
e019c249 JL |
126 | } |
127 | ||
771ee3b0 TG |
128 | /** |
129 | * irq_can_set_affinity - Check if the affinity of a given irq can be set | |
130 | * @irq: Interrupt to check | |
131 | * | |
132 | */ | |
133 | int irq_can_set_affinity(unsigned int irq) | |
134 | { | |
e019c249 | 135 | return __irq_can_set_affinity(irq_to_desc(irq)); |
771ee3b0 TG |
136 | } |
137 | ||
9c255583 TG |
138 | /** |
139 | * irq_can_set_affinity_usr - Check if affinity of a irq can be set from user space | |
140 | * @irq: Interrupt to check | |
141 | * | |
142 | * Like irq_can_set_affinity() above, but additionally checks for the | |
143 | * AFFINITY_MANAGED flag. | |
144 | */ | |
145 | bool irq_can_set_affinity_usr(unsigned int irq) | |
146 | { | |
147 | struct irq_desc *desc = irq_to_desc(irq); | |
148 | ||
149 | return __irq_can_set_affinity(desc) && | |
150 | !irqd_affinity_is_managed(&desc->irq_data); | |
151 | } | |
152 | ||
591d2fb0 TG |
153 | /** |
154 | * irq_set_thread_affinity - Notify irq threads to adjust affinity | |
155 | * @desc: irq descriptor which has affitnity changed | |
156 | * | |
157 | * We just set IRQTF_AFFINITY and delegate the affinity setting | |
158 | * to the interrupt thread itself. We can not call | |
159 | * set_cpus_allowed_ptr() here as we hold desc->lock and this | |
160 | * code can be called from hard interrupt context. | |
161 | */ | |
162 | void irq_set_thread_affinity(struct irq_desc *desc) | |
3aa551c9 | 163 | { |
f944b5a7 | 164 | struct irqaction *action; |
3aa551c9 | 165 | |
f944b5a7 | 166 | for_each_action_of_desc(desc, action) |
3aa551c9 | 167 | if (action->thread) |
591d2fb0 | 168 | set_bit(IRQTF_AFFINITY, &action->thread_flags); |
3aa551c9 TG |
169 | } |
170 | ||
19e1d4e9 TG |
171 | static void irq_validate_effective_affinity(struct irq_data *data) |
172 | { | |
173 | #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK | |
174 | const struct cpumask *m = irq_data_get_effective_affinity_mask(data); | |
175 | struct irq_chip *chip = irq_data_get_irq_chip(data); | |
176 | ||
177 | if (!cpumask_empty(m)) | |
178 | return; | |
179 | pr_warn_once("irq_chip %s did not update eff. affinity mask of irq %u\n", | |
180 | chip->name, data->irq); | |
181 | #endif | |
182 | } | |
183 | ||
818b0f3b JL |
184 | int 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 | ||
e43b3b58 TG |
191 | if (!chip || !chip->irq_set_affinity) |
192 | return -EINVAL; | |
193 | ||
01f8fa4f | 194 | ret = chip->irq_set_affinity(data, mask, force); |
818b0f3b JL |
195 | switch (ret) { |
196 | case IRQ_SET_MASK_OK: | |
2cb62547 | 197 | case IRQ_SET_MASK_OK_DONE: |
9df872fa | 198 | cpumask_copy(desc->irq_common_data.affinity, mask); |
818b0f3b | 199 | case IRQ_SET_MASK_OK_NOCOPY: |
19e1d4e9 | 200 | irq_validate_effective_affinity(data); |
818b0f3b JL |
201 | irq_set_thread_affinity(desc); |
202 | ret = 0; | |
203 | } | |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
01f8fa4f TG |
208 | int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask, |
209 | bool force) | |
771ee3b0 | 210 | { |
c2d0c555 DD |
211 | struct irq_chip *chip = irq_data_get_irq_chip(data); |
212 | struct irq_desc *desc = irq_data_to_desc(data); | |
1fa46f1f | 213 | int ret = 0; |
771ee3b0 | 214 | |
c2d0c555 | 215 | if (!chip || !chip->irq_set_affinity) |
771ee3b0 TG |
216 | return -EINVAL; |
217 | ||
0ef5ca1e | 218 | if (irq_can_move_pcntxt(data)) { |
01f8fa4f | 219 | ret = irq_do_set_affinity(data, mask, force); |
1fa46f1f | 220 | } else { |
c2d0c555 | 221 | irqd_set_move_pending(data); |
1fa46f1f | 222 | irq_copy_pending(desc, mask); |
57b150cc | 223 | } |
1fa46f1f | 224 | |
cd7eab44 BH |
225 | if (desc->affinity_notify) { |
226 | kref_get(&desc->affinity_notify->kref); | |
227 | schedule_work(&desc->affinity_notify->work); | |
228 | } | |
c2d0c555 DD |
229 | irqd_set(data, IRQD_AFFINITY_SET); |
230 | ||
231 | return ret; | |
232 | } | |
233 | ||
01f8fa4f | 234 | int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force) |
c2d0c555 DD |
235 | { |
236 | struct irq_desc *desc = irq_to_desc(irq); | |
237 | unsigned long flags; | |
238 | int ret; | |
239 | ||
240 | if (!desc) | |
241 | return -EINVAL; | |
242 | ||
243 | raw_spin_lock_irqsave(&desc->lock, flags); | |
01f8fa4f | 244 | ret = irq_set_affinity_locked(irq_desc_get_irq_data(desc), mask, force); |
239007b8 | 245 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
1fa46f1f | 246 | return ret; |
771ee3b0 TG |
247 | } |
248 | ||
e7a297b0 PWJ |
249 | int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) |
250 | { | |
e7a297b0 | 251 | unsigned long flags; |
31d9d9b6 | 252 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
e7a297b0 PWJ |
253 | |
254 | if (!desc) | |
255 | return -EINVAL; | |
e7a297b0 | 256 | desc->affinity_hint = m; |
02725e74 | 257 | irq_put_desc_unlock(desc, flags); |
e2e64a93 | 258 | /* set the initial affinity to prevent every interrupt being on CPU0 */ |
4fe7ffb7 JB |
259 | if (m) |
260 | __irq_set_affinity(irq, m, false); | |
e7a297b0 PWJ |
261 | return 0; |
262 | } | |
263 | EXPORT_SYMBOL_GPL(irq_set_affinity_hint); | |
264 | ||
cd7eab44 BH |
265 | static void irq_affinity_notify(struct work_struct *work) |
266 | { | |
267 | struct irq_affinity_notify *notify = | |
268 | container_of(work, struct irq_affinity_notify, work); | |
269 | struct irq_desc *desc = irq_to_desc(notify->irq); | |
270 | cpumask_var_t cpumask; | |
271 | unsigned long flags; | |
272 | ||
1fa46f1f | 273 | if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL)) |
cd7eab44 BH |
274 | goto out; |
275 | ||
276 | raw_spin_lock_irqsave(&desc->lock, flags); | |
0ef5ca1e | 277 | if (irq_move_pending(&desc->irq_data)) |
1fa46f1f | 278 | irq_get_pending(cpumask, desc); |
cd7eab44 | 279 | else |
9df872fa | 280 | cpumask_copy(cpumask, desc->irq_common_data.affinity); |
cd7eab44 BH |
281 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
282 | ||
283 | notify->notify(notify, cpumask); | |
284 | ||
285 | free_cpumask_var(cpumask); | |
286 | out: | |
287 | kref_put(¬ify->kref, notify->release); | |
288 | } | |
289 | ||
290 | /** | |
291 | * irq_set_affinity_notifier - control notification of IRQ affinity changes | |
292 | * @irq: Interrupt for which to enable/disable notification | |
293 | * @notify: Context for notification, or %NULL to disable | |
294 | * notification. Function pointers must be initialised; | |
295 | * the other fields will be initialised by this function. | |
296 | * | |
297 | * Must be called in process context. Notification may only be enabled | |
298 | * after the IRQ is allocated and must be disabled before the IRQ is | |
299 | * freed using free_irq(). | |
300 | */ | |
301 | int | |
302 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) | |
303 | { | |
304 | struct irq_desc *desc = irq_to_desc(irq); | |
305 | struct irq_affinity_notify *old_notify; | |
306 | unsigned long flags; | |
307 | ||
308 | /* The release function is promised process context */ | |
309 | might_sleep(); | |
310 | ||
311 | if (!desc) | |
312 | return -EINVAL; | |
313 | ||
314 | /* Complete initialisation of *notify */ | |
315 | if (notify) { | |
316 | notify->irq = irq; | |
317 | kref_init(¬ify->kref); | |
318 | INIT_WORK(¬ify->work, irq_affinity_notify); | |
319 | } | |
320 | ||
321 | raw_spin_lock_irqsave(&desc->lock, flags); | |
322 | old_notify = desc->affinity_notify; | |
323 | desc->affinity_notify = notify; | |
324 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
325 | ||
326 | if (old_notify) | |
327 | kref_put(&old_notify->kref, old_notify->release); | |
328 | ||
329 | return 0; | |
330 | } | |
331 | EXPORT_SYMBOL_GPL(irq_set_affinity_notifier); | |
332 | ||
18404756 MK |
333 | #ifndef CONFIG_AUTO_IRQ_AFFINITY |
334 | /* | |
335 | * Generic version of the affinity autoselector. | |
336 | */ | |
43564bd9 | 337 | int irq_setup_affinity(struct irq_desc *desc) |
18404756 | 338 | { |
569bda8d | 339 | struct cpumask *set = irq_default_affinity; |
cba4235e TG |
340 | int ret, node = irq_desc_get_node(desc); |
341 | static DEFINE_RAW_SPINLOCK(mask_lock); | |
342 | static struct cpumask mask; | |
569bda8d | 343 | |
b008207c | 344 | /* Excludes PER_CPU and NO_BALANCE interrupts */ |
e019c249 | 345 | if (!__irq_can_set_affinity(desc)) |
18404756 MK |
346 | return 0; |
347 | ||
cba4235e | 348 | raw_spin_lock(&mask_lock); |
f6d87f4b | 349 | /* |
9332ef9d | 350 | * Preserve the managed affinity setting and a userspace affinity |
06ee6d57 | 351 | * setup, but make sure that one of the targets is online. |
f6d87f4b | 352 | */ |
06ee6d57 TG |
353 | if (irqd_affinity_is_managed(&desc->irq_data) || |
354 | irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) { | |
9df872fa | 355 | if (cpumask_intersects(desc->irq_common_data.affinity, |
569bda8d | 356 | cpu_online_mask)) |
9df872fa | 357 | set = desc->irq_common_data.affinity; |
0c6f8a8b | 358 | else |
2bdd1055 | 359 | irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET); |
f6d87f4b | 360 | } |
18404756 | 361 | |
cba4235e | 362 | cpumask_and(&mask, cpu_online_mask, set); |
241fc640 PB |
363 | if (node != NUMA_NO_NODE) { |
364 | const struct cpumask *nodemask = cpumask_of_node(node); | |
365 | ||
366 | /* make sure at least one of the cpus in nodemask is online */ | |
cba4235e TG |
367 | if (cpumask_intersects(&mask, nodemask)) |
368 | cpumask_and(&mask, &mask, nodemask); | |
241fc640 | 369 | } |
cba4235e TG |
370 | ret = irq_do_set_affinity(&desc->irq_data, &mask, false); |
371 | raw_spin_unlock(&mask_lock); | |
372 | return ret; | |
18404756 | 373 | } |
f6d87f4b | 374 | #else |
a8a98eac | 375 | /* Wrapper for ALPHA specific affinity selector magic */ |
cba4235e | 376 | int irq_setup_affinity(struct irq_desc *desc) |
f6d87f4b | 377 | { |
cba4235e | 378 | return irq_select_affinity(irq_desc_get_irq(desc)); |
f6d87f4b | 379 | } |
18404756 MK |
380 | #endif |
381 | ||
f6d87f4b | 382 | /* |
cba4235e | 383 | * Called when a bogus affinity is set via /proc/irq |
f6d87f4b | 384 | */ |
cba4235e | 385 | int irq_select_affinity_usr(unsigned int irq) |
f6d87f4b TG |
386 | { |
387 | struct irq_desc *desc = irq_to_desc(irq); | |
388 | unsigned long flags; | |
389 | int ret; | |
390 | ||
239007b8 | 391 | raw_spin_lock_irqsave(&desc->lock, flags); |
cba4235e | 392 | ret = irq_setup_affinity(desc); |
239007b8 | 393 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
f6d87f4b TG |
394 | return ret; |
395 | } | |
1da177e4 LT |
396 | #endif |
397 | ||
fcf1ae2f FW |
398 | /** |
399 | * irq_set_vcpu_affinity - Set vcpu affinity for the interrupt | |
400 | * @irq: interrupt number to set affinity | |
401 | * @vcpu_info: vCPU specific data | |
402 | * | |
403 | * This function uses the vCPU specific data to set the vCPU | |
404 | * affinity for an irq. The vCPU specific data is passed from | |
405 | * outside, such as KVM. One example code path is as below: | |
406 | * KVM -> IOMMU -> irq_set_vcpu_affinity(). | |
407 | */ | |
408 | int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info) | |
409 | { | |
410 | unsigned long flags; | |
411 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); | |
412 | struct irq_data *data; | |
413 | struct irq_chip *chip; | |
414 | int ret = -ENOSYS; | |
415 | ||
416 | if (!desc) | |
417 | return -EINVAL; | |
418 | ||
419 | data = irq_desc_get_irq_data(desc); | |
0abce64a MZ |
420 | do { |
421 | chip = irq_data_get_irq_chip(data); | |
422 | if (chip && chip->irq_set_vcpu_affinity) | |
423 | break; | |
424 | #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY | |
425 | data = data->parent_data; | |
426 | #else | |
427 | data = NULL; | |
428 | #endif | |
429 | } while (data); | |
430 | ||
431 | if (data) | |
fcf1ae2f FW |
432 | ret = chip->irq_set_vcpu_affinity(data, vcpu_info); |
433 | irq_put_desc_unlock(desc, flags); | |
434 | ||
435 | return ret; | |
436 | } | |
437 | EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity); | |
438 | ||
79ff1cda | 439 | void __disable_irq(struct irq_desc *desc) |
0a0c5168 | 440 | { |
3aae994f | 441 | if (!desc->depth++) |
87923470 | 442 | irq_disable(desc); |
0a0c5168 RW |
443 | } |
444 | ||
02725e74 TG |
445 | static int __disable_irq_nosync(unsigned int irq) |
446 | { | |
447 | unsigned long flags; | |
31d9d9b6 | 448 | struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
02725e74 TG |
449 | |
450 | if (!desc) | |
451 | return -EINVAL; | |
79ff1cda | 452 | __disable_irq(desc); |
02725e74 TG |
453 | irq_put_desc_busunlock(desc, flags); |
454 | return 0; | |
455 | } | |
456 | ||
1da177e4 LT |
457 | /** |
458 | * disable_irq_nosync - disable an irq without waiting | |
459 | * @irq: Interrupt to disable | |
460 | * | |
461 | * Disable the selected interrupt line. Disables and Enables are | |
462 | * nested. | |
463 | * Unlike disable_irq(), this function does not ensure existing | |
464 | * instances of the IRQ handler have completed before returning. | |
465 | * | |
466 | * This function may be called from IRQ context. | |
467 | */ | |
468 | void disable_irq_nosync(unsigned int irq) | |
469 | { | |
02725e74 | 470 | __disable_irq_nosync(irq); |
1da177e4 | 471 | } |
1da177e4 LT |
472 | EXPORT_SYMBOL(disable_irq_nosync); |
473 | ||
474 | /** | |
475 | * disable_irq - disable an irq and wait for completion | |
476 | * @irq: Interrupt to disable | |
477 | * | |
478 | * Disable the selected interrupt line. Enables and Disables are | |
479 | * nested. | |
480 | * This function waits for any pending IRQ handlers for this interrupt | |
481 | * to complete before returning. If you use this function while | |
482 | * holding a resource the IRQ handler may need you will deadlock. | |
483 | * | |
484 | * This function may be called - with care - from IRQ context. | |
485 | */ | |
486 | void disable_irq(unsigned int irq) | |
487 | { | |
02725e74 | 488 | if (!__disable_irq_nosync(irq)) |
1da177e4 LT |
489 | synchronize_irq(irq); |
490 | } | |
1da177e4 LT |
491 | EXPORT_SYMBOL(disable_irq); |
492 | ||
02cea395 PZ |
493 | /** |
494 | * disable_hardirq - disables an irq and waits for hardirq completion | |
495 | * @irq: Interrupt to disable | |
496 | * | |
497 | * Disable the selected interrupt line. Enables and Disables are | |
498 | * nested. | |
499 | * This function waits for any pending hard IRQ handlers for this | |
500 | * interrupt to complete before returning. If you use this function while | |
501 | * holding a resource the hard IRQ handler may need you will deadlock. | |
502 | * | |
503 | * When used to optimistically disable an interrupt from atomic context | |
504 | * the return value must be checked. | |
505 | * | |
506 | * Returns: false if a threaded handler is active. | |
507 | * | |
508 | * This function may be called - with care - from IRQ context. | |
509 | */ | |
510 | bool disable_hardirq(unsigned int irq) | |
511 | { | |
512 | if (!__disable_irq_nosync(irq)) | |
513 | return synchronize_hardirq(irq); | |
514 | ||
515 | return false; | |
516 | } | |
517 | EXPORT_SYMBOL_GPL(disable_hardirq); | |
518 | ||
79ff1cda | 519 | void __enable_irq(struct irq_desc *desc) |
1adb0850 TG |
520 | { |
521 | switch (desc->depth) { | |
522 | case 0: | |
0a0c5168 | 523 | err_out: |
79ff1cda JL |
524 | WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", |
525 | irq_desc_get_irq(desc)); | |
1adb0850 TG |
526 | break; |
527 | case 1: { | |
c531e836 | 528 | if (desc->istate & IRQS_SUSPENDED) |
0a0c5168 | 529 | goto err_out; |
1adb0850 | 530 | /* Prevent probing on this irq: */ |
1ccb4e61 | 531 | irq_settings_set_noprobe(desc); |
201d7f47 TG |
532 | /* |
533 | * Call irq_startup() not irq_enable() here because the | |
534 | * interrupt might be marked NOAUTOEN. So irq_startup() | |
535 | * needs to be invoked when it gets enabled the first | |
536 | * time. If it was already started up, then irq_startup() | |
537 | * will invoke irq_enable() under the hood. | |
538 | */ | |
4cde9c6b | 539 | irq_startup(desc, IRQ_RESEND, IRQ_START_COND); |
201d7f47 | 540 | break; |
1adb0850 TG |
541 | } |
542 | default: | |
543 | desc->depth--; | |
544 | } | |
545 | } | |
546 | ||
1da177e4 LT |
547 | /** |
548 | * enable_irq - enable handling of an irq | |
549 | * @irq: Interrupt to enable | |
550 | * | |
551 | * Undoes the effect of one call to disable_irq(). If this | |
552 | * matches the last disable, processing of interrupts on this | |
553 | * IRQ line is re-enabled. | |
554 | * | |
70aedd24 | 555 | * This function may be called from IRQ context only when |
6b8ff312 | 556 | * desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL ! |
1da177e4 LT |
557 | */ |
558 | void enable_irq(unsigned int irq) | |
559 | { | |
1da177e4 | 560 | unsigned long flags; |
31d9d9b6 | 561 | struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
1da177e4 | 562 | |
7d94f7ca | 563 | if (!desc) |
c2b5a251 | 564 | return; |
50f7c032 TG |
565 | if (WARN(!desc->irq_data.chip, |
566 | KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq)) | |
02725e74 | 567 | goto out; |
2656c366 | 568 | |
79ff1cda | 569 | __enable_irq(desc); |
02725e74 TG |
570 | out: |
571 | irq_put_desc_busunlock(desc, flags); | |
1da177e4 | 572 | } |
1da177e4 LT |
573 | EXPORT_SYMBOL(enable_irq); |
574 | ||
0c5d1eb7 | 575 | static int set_irq_wake_real(unsigned int irq, unsigned int on) |
2db87321 | 576 | { |
08678b08 | 577 | struct irq_desc *desc = irq_to_desc(irq); |
2db87321 UKK |
578 | int ret = -ENXIO; |
579 | ||
60f96b41 SS |
580 | if (irq_desc_get_chip(desc)->flags & IRQCHIP_SKIP_SET_WAKE) |
581 | return 0; | |
582 | ||
2f7e99bb TG |
583 | if (desc->irq_data.chip->irq_set_wake) |
584 | ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on); | |
2db87321 UKK |
585 | |
586 | return ret; | |
587 | } | |
588 | ||
ba9a2331 | 589 | /** |
a0cd9ca2 | 590 | * irq_set_irq_wake - control irq power management wakeup |
ba9a2331 TG |
591 | * @irq: interrupt to control |
592 | * @on: enable/disable power management wakeup | |
593 | * | |
15a647eb DB |
594 | * Enable/disable power management wakeup mode, which is |
595 | * disabled by default. Enables and disables must match, | |
596 | * just as they match for non-wakeup mode support. | |
597 | * | |
598 | * Wakeup mode lets this IRQ wake the system from sleep | |
599 | * states like "suspend to RAM". | |
ba9a2331 | 600 | */ |
a0cd9ca2 | 601 | int irq_set_irq_wake(unsigned int irq, unsigned int on) |
ba9a2331 | 602 | { |
ba9a2331 | 603 | unsigned long flags; |
31d9d9b6 | 604 | struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL); |
2db87321 | 605 | int ret = 0; |
ba9a2331 | 606 | |
13863a66 JJ |
607 | if (!desc) |
608 | return -EINVAL; | |
609 | ||
15a647eb DB |
610 | /* wakeup-capable irqs can be shared between drivers that |
611 | * don't need to have the same sleep mode behaviors. | |
612 | */ | |
15a647eb | 613 | if (on) { |
2db87321 UKK |
614 | if (desc->wake_depth++ == 0) { |
615 | ret = set_irq_wake_real(irq, on); | |
616 | if (ret) | |
617 | desc->wake_depth = 0; | |
618 | else | |
7f94226f | 619 | irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE); |
2db87321 | 620 | } |
15a647eb DB |
621 | } else { |
622 | if (desc->wake_depth == 0) { | |
7a2c4770 | 623 | WARN(1, "Unbalanced IRQ %d wake disable\n", irq); |
2db87321 UKK |
624 | } else if (--desc->wake_depth == 0) { |
625 | ret = set_irq_wake_real(irq, on); | |
626 | if (ret) | |
627 | desc->wake_depth = 1; | |
628 | else | |
7f94226f | 629 | irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE); |
2db87321 | 630 | } |
15a647eb | 631 | } |
02725e74 | 632 | irq_put_desc_busunlock(desc, flags); |
ba9a2331 TG |
633 | return ret; |
634 | } | |
a0cd9ca2 | 635 | EXPORT_SYMBOL(irq_set_irq_wake); |
ba9a2331 | 636 | |
1da177e4 LT |
637 | /* |
638 | * Internal function that tells the architecture code whether a | |
639 | * particular irq has been exclusively allocated or is available | |
640 | * for driver use. | |
641 | */ | |
642 | int can_request_irq(unsigned int irq, unsigned long irqflags) | |
643 | { | |
cc8c3b78 | 644 | unsigned long flags; |
31d9d9b6 | 645 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); |
02725e74 | 646 | int canrequest = 0; |
1da177e4 | 647 | |
7d94f7ca YL |
648 | if (!desc) |
649 | return 0; | |
650 | ||
02725e74 | 651 | if (irq_settings_can_request(desc)) { |
2779db8d BH |
652 | if (!desc->action || |
653 | irqflags & desc->action->flags & IRQF_SHARED) | |
654 | canrequest = 1; | |
02725e74 TG |
655 | } |
656 | irq_put_desc_unlock(desc, flags); | |
657 | return canrequest; | |
1da177e4 LT |
658 | } |
659 | ||
a1ff541a | 660 | int __irq_set_trigger(struct irq_desc *desc, unsigned long flags) |
82736f4d | 661 | { |
6b8ff312 | 662 | struct irq_chip *chip = desc->irq_data.chip; |
d4d5e089 | 663 | int ret, unmask = 0; |
82736f4d | 664 | |
b2ba2c30 | 665 | if (!chip || !chip->irq_set_type) { |
82736f4d UKK |
666 | /* |
667 | * IRQF_TRIGGER_* but the PIC does not support multiple | |
668 | * flow-types? | |
669 | */ | |
a1ff541a JL |
670 | pr_debug("No set_type function for IRQ %d (%s)\n", |
671 | irq_desc_get_irq(desc), | |
f5d89470 | 672 | chip ? (chip->name ? : "unknown") : "unknown"); |
82736f4d UKK |
673 | return 0; |
674 | } | |
675 | ||
d4d5e089 | 676 | if (chip->flags & IRQCHIP_SET_TYPE_MASKED) { |
32f4125e | 677 | if (!irqd_irq_masked(&desc->irq_data)) |
d4d5e089 | 678 | mask_irq(desc); |
32f4125e | 679 | if (!irqd_irq_disabled(&desc->irq_data)) |
d4d5e089 TG |
680 | unmask = 1; |
681 | } | |
682 | ||
00b992de AK |
683 | /* Mask all flags except trigger mode */ |
684 | flags &= IRQ_TYPE_SENSE_MASK; | |
b2ba2c30 | 685 | ret = chip->irq_set_type(&desc->irq_data, flags); |
82736f4d | 686 | |
876dbd4c TG |
687 | switch (ret) { |
688 | case IRQ_SET_MASK_OK: | |
2cb62547 | 689 | case IRQ_SET_MASK_OK_DONE: |
876dbd4c TG |
690 | irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK); |
691 | irqd_set(&desc->irq_data, flags); | |
692 | ||
693 | case IRQ_SET_MASK_OK_NOCOPY: | |
694 | flags = irqd_get_trigger_type(&desc->irq_data); | |
695 | irq_settings_set_trigger_mask(desc, flags); | |
696 | irqd_clear(&desc->irq_data, IRQD_LEVEL); | |
697 | irq_settings_clr_level(desc); | |
698 | if (flags & IRQ_TYPE_LEVEL_MASK) { | |
699 | irq_settings_set_level(desc); | |
700 | irqd_set(&desc->irq_data, IRQD_LEVEL); | |
701 | } | |
46732475 | 702 | |
d4d5e089 | 703 | ret = 0; |
8fff39e0 | 704 | break; |
876dbd4c | 705 | default: |
97fd75b7 | 706 | pr_err("Setting trigger mode %lu for irq %u failed (%pF)\n", |
a1ff541a | 707 | flags, irq_desc_get_irq(desc), chip->irq_set_type); |
0c5d1eb7 | 708 | } |
d4d5e089 TG |
709 | if (unmask) |
710 | unmask_irq(desc); | |
82736f4d UKK |
711 | return ret; |
712 | } | |
713 | ||
293a7a0a TG |
714 | #ifdef CONFIG_HARDIRQS_SW_RESEND |
715 | int irq_set_parent(int irq, int parent_irq) | |
716 | { | |
717 | unsigned long flags; | |
718 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); | |
719 | ||
720 | if (!desc) | |
721 | return -EINVAL; | |
722 | ||
723 | desc->parent_irq = parent_irq; | |
724 | ||
725 | irq_put_desc_unlock(desc, flags); | |
726 | return 0; | |
727 | } | |
3118dac5 | 728 | EXPORT_SYMBOL_GPL(irq_set_parent); |
293a7a0a TG |
729 | #endif |
730 | ||
b25c340c TG |
731 | /* |
732 | * Default primary interrupt handler for threaded interrupts. Is | |
733 | * assigned as primary handler when request_threaded_irq is called | |
734 | * with handler == NULL. Useful for oneshot interrupts. | |
735 | */ | |
736 | static irqreturn_t irq_default_primary_handler(int irq, void *dev_id) | |
737 | { | |
738 | return IRQ_WAKE_THREAD; | |
739 | } | |
740 | ||
399b5da2 TG |
741 | /* |
742 | * Primary handler for nested threaded interrupts. Should never be | |
743 | * called. | |
744 | */ | |
745 | static irqreturn_t irq_nested_primary_handler(int irq, void *dev_id) | |
746 | { | |
747 | WARN(1, "Primary handler called for nested irq %d\n", irq); | |
748 | return IRQ_NONE; | |
749 | } | |
750 | ||
2a1d3ab8 TG |
751 | static irqreturn_t irq_forced_secondary_handler(int irq, void *dev_id) |
752 | { | |
753 | WARN(1, "Secondary action handler called for irq %d\n", irq); | |
754 | return IRQ_NONE; | |
755 | } | |
756 | ||
3aa551c9 TG |
757 | static int irq_wait_for_interrupt(struct irqaction *action) |
758 | { | |
550acb19 IY |
759 | set_current_state(TASK_INTERRUPTIBLE); |
760 | ||
3aa551c9 | 761 | while (!kthread_should_stop()) { |
f48fe81e TG |
762 | |
763 | if (test_and_clear_bit(IRQTF_RUNTHREAD, | |
764 | &action->thread_flags)) { | |
3aa551c9 TG |
765 | __set_current_state(TASK_RUNNING); |
766 | return 0; | |
f48fe81e TG |
767 | } |
768 | schedule(); | |
550acb19 | 769 | set_current_state(TASK_INTERRUPTIBLE); |
3aa551c9 | 770 | } |
550acb19 | 771 | __set_current_state(TASK_RUNNING); |
3aa551c9 TG |
772 | return -1; |
773 | } | |
774 | ||
b25c340c TG |
775 | /* |
776 | * Oneshot interrupts keep the irq line masked until the threaded | |
777 | * handler finished. unmask if the interrupt has not been disabled and | |
778 | * is marked MASKED. | |
779 | */ | |
b5faba21 | 780 | static void irq_finalize_oneshot(struct irq_desc *desc, |
f3f79e38 | 781 | struct irqaction *action) |
b25c340c | 782 | { |
2a1d3ab8 TG |
783 | if (!(desc->istate & IRQS_ONESHOT) || |
784 | action->handler == irq_forced_secondary_handler) | |
b5faba21 | 785 | return; |
0b1adaa0 | 786 | again: |
3876ec9e | 787 | chip_bus_lock(desc); |
239007b8 | 788 | raw_spin_lock_irq(&desc->lock); |
0b1adaa0 TG |
789 | |
790 | /* | |
791 | * Implausible though it may be we need to protect us against | |
792 | * the following scenario: | |
793 | * | |
794 | * The thread is faster done than the hard interrupt handler | |
795 | * on the other CPU. If we unmask the irq line then the | |
796 | * interrupt can come in again and masks the line, leaves due | |
009b4c3b | 797 | * to IRQS_INPROGRESS and the irq line is masked forever. |
b5faba21 TG |
798 | * |
799 | * This also serializes the state of shared oneshot handlers | |
800 | * versus "desc->threads_onehsot |= action->thread_mask;" in | |
801 | * irq_wake_thread(). See the comment there which explains the | |
802 | * serialization. | |
0b1adaa0 | 803 | */ |
32f4125e | 804 | if (unlikely(irqd_irq_inprogress(&desc->irq_data))) { |
0b1adaa0 | 805 | raw_spin_unlock_irq(&desc->lock); |
3876ec9e | 806 | chip_bus_sync_unlock(desc); |
0b1adaa0 TG |
807 | cpu_relax(); |
808 | goto again; | |
809 | } | |
810 | ||
b5faba21 TG |
811 | /* |
812 | * Now check again, whether the thread should run. Otherwise | |
813 | * we would clear the threads_oneshot bit of this thread which | |
814 | * was just set. | |
815 | */ | |
f3f79e38 | 816 | if (test_bit(IRQTF_RUNTHREAD, &action->thread_flags)) |
b5faba21 TG |
817 | goto out_unlock; |
818 | ||
819 | desc->threads_oneshot &= ~action->thread_mask; | |
820 | ||
32f4125e TG |
821 | if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) && |
822 | irqd_irq_masked(&desc->irq_data)) | |
328a4978 | 823 | unmask_threaded_irq(desc); |
32f4125e | 824 | |
b5faba21 | 825 | out_unlock: |
239007b8 | 826 | raw_spin_unlock_irq(&desc->lock); |
3876ec9e | 827 | chip_bus_sync_unlock(desc); |
b25c340c TG |
828 | } |
829 | ||
61f38261 | 830 | #ifdef CONFIG_SMP |
591d2fb0 | 831 | /* |
b04c644e | 832 | * Check whether we need to change the affinity of the interrupt thread. |
591d2fb0 TG |
833 | */ |
834 | static void | |
835 | irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) | |
836 | { | |
837 | cpumask_var_t mask; | |
04aa530e | 838 | bool valid = true; |
591d2fb0 TG |
839 | |
840 | if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags)) | |
841 | return; | |
842 | ||
843 | /* | |
844 | * In case we are out of memory we set IRQTF_AFFINITY again and | |
845 | * try again next time | |
846 | */ | |
847 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { | |
848 | set_bit(IRQTF_AFFINITY, &action->thread_flags); | |
849 | return; | |
850 | } | |
851 | ||
239007b8 | 852 | raw_spin_lock_irq(&desc->lock); |
04aa530e TG |
853 | /* |
854 | * This code is triggered unconditionally. Check the affinity | |
855 | * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out. | |
856 | */ | |
d170fe7d | 857 | if (cpumask_available(desc->irq_common_data.affinity)) |
9df872fa | 858 | cpumask_copy(mask, desc->irq_common_data.affinity); |
04aa530e TG |
859 | else |
860 | valid = false; | |
239007b8 | 861 | raw_spin_unlock_irq(&desc->lock); |
591d2fb0 | 862 | |
04aa530e TG |
863 | if (valid) |
864 | set_cpus_allowed_ptr(current, mask); | |
591d2fb0 TG |
865 | free_cpumask_var(mask); |
866 | } | |
61f38261 BP |
867 | #else |
868 | static inline void | |
869 | irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { } | |
870 | #endif | |
591d2fb0 | 871 | |
8d32a307 TG |
872 | /* |
873 | * Interrupts which are not explicitely requested as threaded | |
874 | * interrupts rely on the implicit bh/preempt disable of the hard irq | |
875 | * context. So we need to disable bh here to avoid deadlocks and other | |
876 | * side effects. | |
877 | */ | |
3a43e05f | 878 | static irqreturn_t |
8d32a307 TG |
879 | irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action) |
880 | { | |
3a43e05f SAS |
881 | irqreturn_t ret; |
882 | ||
8d32a307 | 883 | local_bh_disable(); |
3a43e05f | 884 | ret = action->thread_fn(action->irq, action->dev_id); |
f3f79e38 | 885 | irq_finalize_oneshot(desc, action); |
8d32a307 | 886 | local_bh_enable(); |
3a43e05f | 887 | return ret; |
8d32a307 TG |
888 | } |
889 | ||
890 | /* | |
f788e7bf | 891 | * Interrupts explicitly requested as threaded interrupts want to be |
8d32a307 TG |
892 | * preemtible - many of them need to sleep and wait for slow busses to |
893 | * complete. | |
894 | */ | |
3a43e05f SAS |
895 | static irqreturn_t irq_thread_fn(struct irq_desc *desc, |
896 | struct irqaction *action) | |
8d32a307 | 897 | { |
3a43e05f SAS |
898 | irqreturn_t ret; |
899 | ||
900 | ret = action->thread_fn(action->irq, action->dev_id); | |
f3f79e38 | 901 | irq_finalize_oneshot(desc, action); |
3a43e05f | 902 | return ret; |
8d32a307 TG |
903 | } |
904 | ||
7140ea19 IY |
905 | static void wake_threads_waitq(struct irq_desc *desc) |
906 | { | |
c685689f | 907 | if (atomic_dec_and_test(&desc->threads_active)) |
7140ea19 IY |
908 | wake_up(&desc->wait_for_threads); |
909 | } | |
910 | ||
67d12145 | 911 | static void irq_thread_dtor(struct callback_head *unused) |
4d1d61a6 ON |
912 | { |
913 | struct task_struct *tsk = current; | |
914 | struct irq_desc *desc; | |
915 | struct irqaction *action; | |
916 | ||
917 | if (WARN_ON_ONCE(!(current->flags & PF_EXITING))) | |
918 | return; | |
919 | ||
920 | action = kthread_data(tsk); | |
921 | ||
fb21affa | 922 | pr_err("exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n", |
19af395d | 923 | tsk->comm, tsk->pid, action->irq); |
4d1d61a6 ON |
924 | |
925 | ||
926 | desc = irq_to_desc(action->irq); | |
927 | /* | |
928 | * If IRQTF_RUNTHREAD is set, we need to decrement | |
929 | * desc->threads_active and wake possible waiters. | |
930 | */ | |
931 | if (test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags)) | |
932 | wake_threads_waitq(desc); | |
933 | ||
934 | /* Prevent a stale desc->threads_oneshot */ | |
935 | irq_finalize_oneshot(desc, action); | |
936 | } | |
937 | ||
2a1d3ab8 TG |
938 | static void irq_wake_secondary(struct irq_desc *desc, struct irqaction *action) |
939 | { | |
940 | struct irqaction *secondary = action->secondary; | |
941 | ||
942 | if (WARN_ON_ONCE(!secondary)) | |
943 | return; | |
944 | ||
945 | raw_spin_lock_irq(&desc->lock); | |
946 | __irq_wake_thread(desc, secondary); | |
947 | raw_spin_unlock_irq(&desc->lock); | |
948 | } | |
949 | ||
3aa551c9 TG |
950 | /* |
951 | * Interrupt handler thread | |
952 | */ | |
953 | static int irq_thread(void *data) | |
954 | { | |
67d12145 | 955 | struct callback_head on_exit_work; |
3aa551c9 TG |
956 | struct irqaction *action = data; |
957 | struct irq_desc *desc = irq_to_desc(action->irq); | |
3a43e05f SAS |
958 | irqreturn_t (*handler_fn)(struct irq_desc *desc, |
959 | struct irqaction *action); | |
3aa551c9 | 960 | |
540b60e2 | 961 | if (force_irqthreads && test_bit(IRQTF_FORCED_THREAD, |
8d32a307 TG |
962 | &action->thread_flags)) |
963 | handler_fn = irq_forced_thread_fn; | |
964 | else | |
965 | handler_fn = irq_thread_fn; | |
966 | ||
41f9d29f | 967 | init_task_work(&on_exit_work, irq_thread_dtor); |
4d1d61a6 | 968 | task_work_add(current, &on_exit_work, false); |
3aa551c9 | 969 | |
f3de44ed SM |
970 | irq_thread_check_affinity(desc, action); |
971 | ||
3aa551c9 | 972 | while (!irq_wait_for_interrupt(action)) { |
7140ea19 | 973 | irqreturn_t action_ret; |
3aa551c9 | 974 | |
591d2fb0 TG |
975 | irq_thread_check_affinity(desc, action); |
976 | ||
7140ea19 | 977 | action_ret = handler_fn(desc, action); |
1e77d0a1 TG |
978 | if (action_ret == IRQ_HANDLED) |
979 | atomic_inc(&desc->threads_handled); | |
2a1d3ab8 TG |
980 | if (action_ret == IRQ_WAKE_THREAD) |
981 | irq_wake_secondary(desc, action); | |
3aa551c9 | 982 | |
7140ea19 | 983 | wake_threads_waitq(desc); |
3aa551c9 TG |
984 | } |
985 | ||
7140ea19 IY |
986 | /* |
987 | * This is the regular exit path. __free_irq() is stopping the | |
988 | * thread via kthread_stop() after calling | |
989 | * synchronize_irq(). So neither IRQTF_RUNTHREAD nor the | |
e04268b0 TG |
990 | * oneshot mask bit can be set. We cannot verify that as we |
991 | * cannot touch the oneshot mask at this point anymore as | |
992 | * __setup_irq() might have given out currents thread_mask | |
993 | * again. | |
3aa551c9 | 994 | */ |
4d1d61a6 | 995 | task_work_cancel(current, irq_thread_dtor); |
3aa551c9 TG |
996 | return 0; |
997 | } | |
998 | ||
a92444c6 TG |
999 | /** |
1000 | * irq_wake_thread - wake the irq thread for the action identified by dev_id | |
1001 | * @irq: Interrupt line | |
1002 | * @dev_id: Device identity for which the thread should be woken | |
1003 | * | |
1004 | */ | |
1005 | void irq_wake_thread(unsigned int irq, void *dev_id) | |
1006 | { | |
1007 | struct irq_desc *desc = irq_to_desc(irq); | |
1008 | struct irqaction *action; | |
1009 | unsigned long flags; | |
1010 | ||
1011 | if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc))) | |
1012 | return; | |
1013 | ||
1014 | raw_spin_lock_irqsave(&desc->lock, flags); | |
f944b5a7 | 1015 | for_each_action_of_desc(desc, action) { |
a92444c6 TG |
1016 | if (action->dev_id == dev_id) { |
1017 | if (action->thread) | |
1018 | __irq_wake_thread(desc, action); | |
1019 | break; | |
1020 | } | |
1021 | } | |
1022 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(irq_wake_thread); | |
1025 | ||
2a1d3ab8 | 1026 | static int irq_setup_forced_threading(struct irqaction *new) |
8d32a307 TG |
1027 | { |
1028 | if (!force_irqthreads) | |
2a1d3ab8 | 1029 | return 0; |
8d32a307 | 1030 | if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT)) |
2a1d3ab8 | 1031 | return 0; |
8d32a307 TG |
1032 | |
1033 | new->flags |= IRQF_ONESHOT; | |
1034 | ||
2a1d3ab8 TG |
1035 | /* |
1036 | * Handle the case where we have a real primary handler and a | |
1037 | * thread handler. We force thread them as well by creating a | |
1038 | * secondary action. | |
1039 | */ | |
1040 | if (new->handler != irq_default_primary_handler && new->thread_fn) { | |
1041 | /* Allocate the secondary action */ | |
1042 | new->secondary = kzalloc(sizeof(struct irqaction), GFP_KERNEL); | |
1043 | if (!new->secondary) | |
1044 | return -ENOMEM; | |
1045 | new->secondary->handler = irq_forced_secondary_handler; | |
1046 | new->secondary->thread_fn = new->thread_fn; | |
1047 | new->secondary->dev_id = new->dev_id; | |
1048 | new->secondary->irq = new->irq; | |
1049 | new->secondary->name = new->name; | |
8d32a307 | 1050 | } |
2a1d3ab8 TG |
1051 | /* Deal with the primary handler */ |
1052 | set_bit(IRQTF_FORCED_THREAD, &new->thread_flags); | |
1053 | new->thread_fn = new->handler; | |
1054 | new->handler = irq_default_primary_handler; | |
1055 | return 0; | |
8d32a307 TG |
1056 | } |
1057 | ||
c1bacbae TG |
1058 | static int irq_request_resources(struct irq_desc *desc) |
1059 | { | |
1060 | struct irq_data *d = &desc->irq_data; | |
1061 | struct irq_chip *c = d->chip; | |
1062 | ||
1063 | return c->irq_request_resources ? c->irq_request_resources(d) : 0; | |
1064 | } | |
1065 | ||
1066 | static void irq_release_resources(struct irq_desc *desc) | |
1067 | { | |
1068 | struct irq_data *d = &desc->irq_data; | |
1069 | struct irq_chip *c = d->chip; | |
1070 | ||
1071 | if (c->irq_release_resources) | |
1072 | c->irq_release_resources(d); | |
1073 | } | |
1074 | ||
2a1d3ab8 TG |
1075 | static int |
1076 | setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary) | |
1077 | { | |
1078 | struct task_struct *t; | |
1079 | struct sched_param param = { | |
1080 | .sched_priority = MAX_USER_RT_PRIO/2, | |
1081 | }; | |
1082 | ||
1083 | if (!secondary) { | |
1084 | t = kthread_create(irq_thread, new, "irq/%d-%s", irq, | |
1085 | new->name); | |
1086 | } else { | |
1087 | t = kthread_create(irq_thread, new, "irq/%d-s-%s", irq, | |
1088 | new->name); | |
1089 | param.sched_priority -= 1; | |
1090 | } | |
1091 | ||
1092 | if (IS_ERR(t)) | |
1093 | return PTR_ERR(t); | |
1094 | ||
1095 | sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m); | |
1096 | ||
1097 | /* | |
1098 | * We keep the reference to the task struct even if | |
1099 | * the thread dies to avoid that the interrupt code | |
1100 | * references an already freed task_struct. | |
1101 | */ | |
1102 | get_task_struct(t); | |
1103 | new->thread = t; | |
1104 | /* | |
1105 | * Tell the thread to set its affinity. This is | |
1106 | * important for shared interrupt handlers as we do | |
1107 | * not invoke setup_affinity() for the secondary | |
1108 | * handlers as everything is already set up. Even for | |
1109 | * interrupts marked with IRQF_NO_BALANCE this is | |
1110 | * correct as we want the thread to move to the cpu(s) | |
1111 | * on which the requesting code placed the interrupt. | |
1112 | */ | |
1113 | set_bit(IRQTF_AFFINITY, &new->thread_flags); | |
1114 | return 0; | |
1115 | } | |
1116 | ||
1da177e4 LT |
1117 | /* |
1118 | * Internal function to register an irqaction - typically used to | |
1119 | * allocate special interrupts that are part of the architecture. | |
19d39a38 TG |
1120 | * |
1121 | * Locking rules: | |
1122 | * | |
1123 | * desc->request_mutex Provides serialization against a concurrent free_irq() | |
1124 | * chip_bus_lock Provides serialization for slow bus operations | |
1125 | * desc->lock Provides serialization against hard interrupts | |
1126 | * | |
1127 | * chip_bus_lock and desc->lock are sufficient for all other management and | |
1128 | * interrupt related functions. desc->request_mutex solely serializes | |
1129 | * request/free_irq(). | |
1da177e4 | 1130 | */ |
d3c60047 | 1131 | static int |
327ec569 | 1132 | __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) |
1da177e4 | 1133 | { |
f17c7545 | 1134 | struct irqaction *old, **old_ptr; |
b5faba21 | 1135 | unsigned long flags, thread_mask = 0; |
3b8249e7 | 1136 | int ret, nested, shared = 0; |
1da177e4 | 1137 | |
7d94f7ca | 1138 | if (!desc) |
c2b5a251 MW |
1139 | return -EINVAL; |
1140 | ||
6b8ff312 | 1141 | if (desc->irq_data.chip == &no_irq_chip) |
1da177e4 | 1142 | return -ENOSYS; |
b6873807 SAS |
1143 | if (!try_module_get(desc->owner)) |
1144 | return -ENODEV; | |
1da177e4 | 1145 | |
2a1d3ab8 TG |
1146 | new->irq = irq; |
1147 | ||
4b357dae JH |
1148 | /* |
1149 | * If the trigger type is not specified by the caller, | |
1150 | * then use the default for this interrupt. | |
1151 | */ | |
1152 | if (!(new->flags & IRQF_TRIGGER_MASK)) | |
1153 | new->flags |= irqd_get_trigger_type(&desc->irq_data); | |
1154 | ||
3aa551c9 | 1155 | /* |
399b5da2 TG |
1156 | * Check whether the interrupt nests into another interrupt |
1157 | * thread. | |
1158 | */ | |
1ccb4e61 | 1159 | nested = irq_settings_is_nested_thread(desc); |
399b5da2 | 1160 | if (nested) { |
b6873807 SAS |
1161 | if (!new->thread_fn) { |
1162 | ret = -EINVAL; | |
1163 | goto out_mput; | |
1164 | } | |
399b5da2 TG |
1165 | /* |
1166 | * Replace the primary handler which was provided from | |
1167 | * the driver for non nested interrupt handling by the | |
1168 | * dummy function which warns when called. | |
1169 | */ | |
1170 | new->handler = irq_nested_primary_handler; | |
8d32a307 | 1171 | } else { |
2a1d3ab8 TG |
1172 | if (irq_settings_can_thread(desc)) { |
1173 | ret = irq_setup_forced_threading(new); | |
1174 | if (ret) | |
1175 | goto out_mput; | |
1176 | } | |
399b5da2 TG |
1177 | } |
1178 | ||
3aa551c9 | 1179 | /* |
399b5da2 TG |
1180 | * Create a handler thread when a thread function is supplied |
1181 | * and the interrupt does not nest into another interrupt | |
1182 | * thread. | |
3aa551c9 | 1183 | */ |
399b5da2 | 1184 | if (new->thread_fn && !nested) { |
2a1d3ab8 TG |
1185 | ret = setup_irq_thread(new, irq, false); |
1186 | if (ret) | |
b6873807 | 1187 | goto out_mput; |
2a1d3ab8 TG |
1188 | if (new->secondary) { |
1189 | ret = setup_irq_thread(new->secondary, irq, true); | |
1190 | if (ret) | |
1191 | goto out_thread; | |
b6873807 | 1192 | } |
3aa551c9 TG |
1193 | } |
1194 | ||
dc9b229a TG |
1195 | /* |
1196 | * Drivers are often written to work w/o knowledge about the | |
1197 | * underlying irq chip implementation, so a request for a | |
1198 | * threaded irq without a primary hard irq context handler | |
1199 | * requires the ONESHOT flag to be set. Some irq chips like | |
1200 | * MSI based interrupts are per se one shot safe. Check the | |
1201 | * chip flags, so we can avoid the unmask dance at the end of | |
1202 | * the threaded handler for those. | |
1203 | */ | |
1204 | if (desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE) | |
1205 | new->flags &= ~IRQF_ONESHOT; | |
1206 | ||
19d39a38 TG |
1207 | /* |
1208 | * Protects against a concurrent __free_irq() call which might wait | |
1209 | * for synchronize_irq() to complete without holding the optional | |
1210 | * chip bus lock and desc->lock. | |
1211 | */ | |
9114014c | 1212 | mutex_lock(&desc->request_mutex); |
19d39a38 TG |
1213 | |
1214 | /* | |
1215 | * Acquire bus lock as the irq_request_resources() callback below | |
1216 | * might rely on the serialization or the magic power management | |
1217 | * functions which are abusing the irq_bus_lock() callback, | |
1218 | */ | |
1219 | chip_bus_lock(desc); | |
1220 | ||
1221 | /* First installed action requests resources. */ | |
46e48e25 TG |
1222 | if (!desc->action) { |
1223 | ret = irq_request_resources(desc); | |
1224 | if (ret) { | |
1225 | pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n", | |
1226 | new->name, irq, desc->irq_data.chip->name); | |
19d39a38 | 1227 | goto out_bus_unlock; |
46e48e25 TG |
1228 | } |
1229 | } | |
9114014c | 1230 | |
1da177e4 LT |
1231 | /* |
1232 | * The following block of code has to be executed atomically | |
19d39a38 TG |
1233 | * protected against a concurrent interrupt and any of the other |
1234 | * management calls which are not serialized via | |
1235 | * desc->request_mutex or the optional bus lock. | |
1da177e4 | 1236 | */ |
239007b8 | 1237 | raw_spin_lock_irqsave(&desc->lock, flags); |
f17c7545 IM |
1238 | old_ptr = &desc->action; |
1239 | old = *old_ptr; | |
06fcb0c6 | 1240 | if (old) { |
e76de9f8 TG |
1241 | /* |
1242 | * Can't share interrupts unless both agree to and are | |
1243 | * the same type (level, edge, polarity). So both flag | |
3cca53b0 | 1244 | * fields must have IRQF_SHARED set and the bits which |
9d591edd TG |
1245 | * set the trigger type must match. Also all must |
1246 | * agree on ONESHOT. | |
e76de9f8 | 1247 | */ |
382bd4de HG |
1248 | unsigned int oldtype = irqd_get_trigger_type(&desc->irq_data); |
1249 | ||
3cca53b0 | 1250 | if (!((old->flags & new->flags) & IRQF_SHARED) || |
382bd4de | 1251 | (oldtype != (new->flags & IRQF_TRIGGER_MASK)) || |
f5d89470 | 1252 | ((old->flags ^ new->flags) & IRQF_ONESHOT)) |
f5163427 DS |
1253 | goto mismatch; |
1254 | ||
f5163427 | 1255 | /* All handlers must agree on per-cpuness */ |
3cca53b0 TG |
1256 | if ((old->flags & IRQF_PERCPU) != |
1257 | (new->flags & IRQF_PERCPU)) | |
f5163427 | 1258 | goto mismatch; |
1da177e4 LT |
1259 | |
1260 | /* add new interrupt at end of irq queue */ | |
1261 | do { | |
52abb700 TG |
1262 | /* |
1263 | * Or all existing action->thread_mask bits, | |
1264 | * so we can find the next zero bit for this | |
1265 | * new action. | |
1266 | */ | |
b5faba21 | 1267 | thread_mask |= old->thread_mask; |
f17c7545 IM |
1268 | old_ptr = &old->next; |
1269 | old = *old_ptr; | |
1da177e4 LT |
1270 | } while (old); |
1271 | shared = 1; | |
1272 | } | |
1273 | ||
b5faba21 | 1274 | /* |
52abb700 TG |
1275 | * Setup the thread mask for this irqaction for ONESHOT. For |
1276 | * !ONESHOT irqs the thread mask is 0 so we can avoid a | |
1277 | * conditional in irq_wake_thread(). | |
b5faba21 | 1278 | */ |
52abb700 TG |
1279 | if (new->flags & IRQF_ONESHOT) { |
1280 | /* | |
1281 | * Unlikely to have 32 resp 64 irqs sharing one line, | |
1282 | * but who knows. | |
1283 | */ | |
1284 | if (thread_mask == ~0UL) { | |
1285 | ret = -EBUSY; | |
cba4235e | 1286 | goto out_unlock; |
52abb700 TG |
1287 | } |
1288 | /* | |
1289 | * The thread_mask for the action is or'ed to | |
1290 | * desc->thread_active to indicate that the | |
1291 | * IRQF_ONESHOT thread handler has been woken, but not | |
1292 | * yet finished. The bit is cleared when a thread | |
1293 | * completes. When all threads of a shared interrupt | |
1294 | * line have completed desc->threads_active becomes | |
1295 | * zero and the interrupt line is unmasked. See | |
1296 | * handle.c:irq_wake_thread() for further information. | |
1297 | * | |
1298 | * If no thread is woken by primary (hard irq context) | |
1299 | * interrupt handlers, then desc->threads_active is | |
1300 | * also checked for zero to unmask the irq line in the | |
1301 | * affected hard irq flow handlers | |
1302 | * (handle_[fasteoi|level]_irq). | |
1303 | * | |
1304 | * The new action gets the first zero bit of | |
1305 | * thread_mask assigned. See the loop above which or's | |
1306 | * all existing action->thread_mask bits. | |
1307 | */ | |
1308 | new->thread_mask = 1 << ffz(thread_mask); | |
1c6c6952 | 1309 | |
dc9b229a TG |
1310 | } else if (new->handler == irq_default_primary_handler && |
1311 | !(desc->irq_data.chip->flags & IRQCHIP_ONESHOT_SAFE)) { | |
1c6c6952 TG |
1312 | /* |
1313 | * The interrupt was requested with handler = NULL, so | |
1314 | * we use the default primary handler for it. But it | |
1315 | * does not have the oneshot flag set. In combination | |
1316 | * with level interrupts this is deadly, because the | |
1317 | * default primary handler just wakes the thread, then | |
1318 | * the irq lines is reenabled, but the device still | |
1319 | * has the level irq asserted. Rinse and repeat.... | |
1320 | * | |
1321 | * While this works for edge type interrupts, we play | |
1322 | * it safe and reject unconditionally because we can't | |
1323 | * say for sure which type this interrupt really | |
1324 | * has. The type flags are unreliable as the | |
1325 | * underlying chip implementation can override them. | |
1326 | */ | |
97fd75b7 | 1327 | pr_err("Threaded irq requested with handler=NULL and !ONESHOT for irq %d\n", |
1c6c6952 TG |
1328 | irq); |
1329 | ret = -EINVAL; | |
cba4235e | 1330 | goto out_unlock; |
b5faba21 | 1331 | } |
b5faba21 | 1332 | |
1da177e4 | 1333 | if (!shared) { |
3aa551c9 TG |
1334 | init_waitqueue_head(&desc->wait_for_threads); |
1335 | ||
e76de9f8 | 1336 | /* Setup the type (level, edge polarity) if configured: */ |
3cca53b0 | 1337 | if (new->flags & IRQF_TRIGGER_MASK) { |
a1ff541a JL |
1338 | ret = __irq_set_trigger(desc, |
1339 | new->flags & IRQF_TRIGGER_MASK); | |
82736f4d | 1340 | |
19d39a38 | 1341 | if (ret) |
cba4235e | 1342 | goto out_unlock; |
091738a2 | 1343 | } |
6a6de9ef | 1344 | |
009b4c3b | 1345 | desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \ |
32f4125e TG |
1346 | IRQS_ONESHOT | IRQS_WAITING); |
1347 | irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS); | |
94d39e1f | 1348 | |
a005677b TG |
1349 | if (new->flags & IRQF_PERCPU) { |
1350 | irqd_set(&desc->irq_data, IRQD_PER_CPU); | |
1351 | irq_settings_set_per_cpu(desc); | |
1352 | } | |
6a58fb3b | 1353 | |
b25c340c | 1354 | if (new->flags & IRQF_ONESHOT) |
3d67baec | 1355 | desc->istate |= IRQS_ONESHOT; |
b25c340c | 1356 | |
2e051552 TG |
1357 | /* Exclude IRQ from balancing if requested */ |
1358 | if (new->flags & IRQF_NOBALANCING) { | |
1359 | irq_settings_set_no_balancing(desc); | |
1360 | irqd_set(&desc->irq_data, IRQD_NO_BALANCING); | |
1361 | } | |
1362 | ||
04c848d3 | 1363 | if (irq_settings_can_autoenable(desc)) { |
4cde9c6b | 1364 | irq_startup(desc, IRQ_RESEND, IRQ_START_COND); |
04c848d3 TG |
1365 | } else { |
1366 | /* | |
1367 | * Shared interrupts do not go well with disabling | |
1368 | * auto enable. The sharing interrupt might request | |
1369 | * it while it's still disabled and then wait for | |
1370 | * interrupts forever. | |
1371 | */ | |
1372 | WARN_ON_ONCE(new->flags & IRQF_SHARED); | |
e76de9f8 TG |
1373 | /* Undo nested disables: */ |
1374 | desc->depth = 1; | |
04c848d3 | 1375 | } |
18404756 | 1376 | |
876dbd4c TG |
1377 | } else if (new->flags & IRQF_TRIGGER_MASK) { |
1378 | unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK; | |
7ee7e87d | 1379 | unsigned int omsk = irqd_get_trigger_type(&desc->irq_data); |
876dbd4c TG |
1380 | |
1381 | if (nmsk != omsk) | |
1382 | /* hope the handler works with current trigger mode */ | |
a395d6a7 | 1383 | pr_warn("irq %d uses trigger mode %u; requested %u\n", |
7ee7e87d | 1384 | irq, omsk, nmsk); |
1da177e4 | 1385 | } |
82736f4d | 1386 | |
f17c7545 | 1387 | *old_ptr = new; |
82736f4d | 1388 | |
cab303be TG |
1389 | irq_pm_install_action(desc, new); |
1390 | ||
8528b0f1 LT |
1391 | /* Reset broken irq detection when installing new handler */ |
1392 | desc->irq_count = 0; | |
1393 | desc->irqs_unhandled = 0; | |
1adb0850 TG |
1394 | |
1395 | /* | |
1396 | * Check whether we disabled the irq via the spurious handler | |
1397 | * before. Reenable it and give it another chance. | |
1398 | */ | |
7acdd53e TG |
1399 | if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) { |
1400 | desc->istate &= ~IRQS_SPURIOUS_DISABLED; | |
79ff1cda | 1401 | __enable_irq(desc); |
1adb0850 TG |
1402 | } |
1403 | ||
239007b8 | 1404 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
3a90795e | 1405 | chip_bus_sync_unlock(desc); |
9114014c | 1406 | mutex_unlock(&desc->request_mutex); |
1da177e4 | 1407 | |
b2d3d61a DL |
1408 | irq_setup_timings(desc, new); |
1409 | ||
69ab8494 TG |
1410 | /* |
1411 | * Strictly no need to wake it up, but hung_task complains | |
1412 | * when no hard interrupt wakes the thread up. | |
1413 | */ | |
1414 | if (new->thread) | |
1415 | wake_up_process(new->thread); | |
2a1d3ab8 TG |
1416 | if (new->secondary) |
1417 | wake_up_process(new->secondary->thread); | |
69ab8494 | 1418 | |
2c6927a3 | 1419 | register_irq_proc(irq, desc); |
087cdfb6 | 1420 | irq_add_debugfs_entry(irq, desc); |
1da177e4 LT |
1421 | new->dir = NULL; |
1422 | register_handler_proc(irq, new); | |
1da177e4 | 1423 | return 0; |
f5163427 DS |
1424 | |
1425 | mismatch: | |
3cca53b0 | 1426 | if (!(new->flags & IRQF_PROBE_SHARED)) { |
97fd75b7 | 1427 | pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n", |
f5d89470 TG |
1428 | irq, new->flags, new->name, old->flags, old->name); |
1429 | #ifdef CONFIG_DEBUG_SHIRQ | |
13e87ec6 | 1430 | dump_stack(); |
3f050447 | 1431 | #endif |
f5d89470 | 1432 | } |
3aa551c9 TG |
1433 | ret = -EBUSY; |
1434 | ||
cba4235e | 1435 | out_unlock: |
1c389795 | 1436 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
3b8249e7 | 1437 | |
46e48e25 TG |
1438 | if (!desc->action) |
1439 | irq_release_resources(desc); | |
19d39a38 TG |
1440 | out_bus_unlock: |
1441 | chip_bus_sync_unlock(desc); | |
9114014c TG |
1442 | mutex_unlock(&desc->request_mutex); |
1443 | ||
3aa551c9 | 1444 | out_thread: |
3aa551c9 TG |
1445 | if (new->thread) { |
1446 | struct task_struct *t = new->thread; | |
1447 | ||
1448 | new->thread = NULL; | |
05d74efa | 1449 | kthread_stop(t); |
3aa551c9 TG |
1450 | put_task_struct(t); |
1451 | } | |
2a1d3ab8 TG |
1452 | if (new->secondary && new->secondary->thread) { |
1453 | struct task_struct *t = new->secondary->thread; | |
1454 | ||
1455 | new->secondary->thread = NULL; | |
1456 | kthread_stop(t); | |
1457 | put_task_struct(t); | |
1458 | } | |
b6873807 SAS |
1459 | out_mput: |
1460 | module_put(desc->owner); | |
3aa551c9 | 1461 | return ret; |
1da177e4 LT |
1462 | } |
1463 | ||
d3c60047 TG |
1464 | /** |
1465 | * setup_irq - setup an interrupt | |
1466 | * @irq: Interrupt line to setup | |
1467 | * @act: irqaction for the interrupt | |
1468 | * | |
1469 | * Used to statically setup interrupts in the early boot process. | |
1470 | */ | |
1471 | int setup_irq(unsigned int irq, struct irqaction *act) | |
1472 | { | |
986c011d | 1473 | int retval; |
d3c60047 TG |
1474 | struct irq_desc *desc = irq_to_desc(irq); |
1475 | ||
9b5d585d | 1476 | if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
31d9d9b6 | 1477 | return -EINVAL; |
be45beb2 JH |
1478 | |
1479 | retval = irq_chip_pm_get(&desc->irq_data); | |
1480 | if (retval < 0) | |
1481 | return retval; | |
1482 | ||
986c011d | 1483 | retval = __setup_irq(irq, desc, act); |
986c011d | 1484 | |
be45beb2 JH |
1485 | if (retval) |
1486 | irq_chip_pm_put(&desc->irq_data); | |
1487 | ||
986c011d | 1488 | return retval; |
d3c60047 | 1489 | } |
eb53b4e8 | 1490 | EXPORT_SYMBOL_GPL(setup_irq); |
d3c60047 | 1491 | |
31d9d9b6 | 1492 | /* |
cbf94f06 MD |
1493 | * Internal function to unregister an irqaction - used to free |
1494 | * regular and special interrupts that are part of the architecture. | |
1da177e4 | 1495 | */ |
cbf94f06 | 1496 | static struct irqaction *__free_irq(unsigned int irq, void *dev_id) |
1da177e4 | 1497 | { |
d3c60047 | 1498 | struct irq_desc *desc = irq_to_desc(irq); |
f17c7545 | 1499 | struct irqaction *action, **action_ptr; |
1da177e4 LT |
1500 | unsigned long flags; |
1501 | ||
ae88a23b | 1502 | WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq); |
7d94f7ca | 1503 | |
7d94f7ca | 1504 | if (!desc) |
f21cfb25 | 1505 | return NULL; |
1da177e4 | 1506 | |
9114014c | 1507 | mutex_lock(&desc->request_mutex); |
abc7e40c | 1508 | chip_bus_lock(desc); |
239007b8 | 1509 | raw_spin_lock_irqsave(&desc->lock, flags); |
ae88a23b IM |
1510 | |
1511 | /* | |
1512 | * There can be multiple actions per IRQ descriptor, find the right | |
1513 | * one based on the dev_id: | |
1514 | */ | |
f17c7545 | 1515 | action_ptr = &desc->action; |
1da177e4 | 1516 | for (;;) { |
f17c7545 | 1517 | action = *action_ptr; |
1da177e4 | 1518 | |
ae88a23b IM |
1519 | if (!action) { |
1520 | WARN(1, "Trying to free already-free IRQ %d\n", irq); | |
239007b8 | 1521 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
abc7e40c | 1522 | chip_bus_sync_unlock(desc); |
19d39a38 | 1523 | mutex_unlock(&desc->request_mutex); |
f21cfb25 | 1524 | return NULL; |
ae88a23b | 1525 | } |
1da177e4 | 1526 | |
8316e381 IM |
1527 | if (action->dev_id == dev_id) |
1528 | break; | |
f17c7545 | 1529 | action_ptr = &action->next; |
ae88a23b | 1530 | } |
dbce706e | 1531 | |
ae88a23b | 1532 | /* Found it - now remove it from the list of entries: */ |
f17c7545 | 1533 | *action_ptr = action->next; |
ae88a23b | 1534 | |
cab303be TG |
1535 | irq_pm_remove_action(desc, action); |
1536 | ||
ae88a23b | 1537 | /* If this was the last handler, shut down the IRQ line: */ |
c1bacbae | 1538 | if (!desc->action) { |
e9849777 | 1539 | irq_settings_clr_disable_unlazy(desc); |
46999238 | 1540 | irq_shutdown(desc); |
c1bacbae | 1541 | } |
3aa551c9 | 1542 | |
e7a297b0 PWJ |
1543 | #ifdef CONFIG_SMP |
1544 | /* make sure affinity_hint is cleaned up */ | |
1545 | if (WARN_ON_ONCE(desc->affinity_hint)) | |
1546 | desc->affinity_hint = NULL; | |
1547 | #endif | |
1548 | ||
239007b8 | 1549 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
19d39a38 TG |
1550 | /* |
1551 | * Drop bus_lock here so the changes which were done in the chip | |
1552 | * callbacks above are synced out to the irq chips which hang | |
1553 | * behind a slow bus (I2C, SPI) before calling synchronize_irq(). | |
1554 | * | |
1555 | * Aside of that the bus_lock can also be taken from the threaded | |
1556 | * handler in irq_finalize_oneshot() which results in a deadlock | |
1557 | * because synchronize_irq() would wait forever for the thread to | |
1558 | * complete, which is blocked on the bus lock. | |
1559 | * | |
1560 | * The still held desc->request_mutex() protects against a | |
1561 | * concurrent request_irq() of this irq so the release of resources | |
1562 | * and timing data is properly serialized. | |
1563 | */ | |
abc7e40c | 1564 | chip_bus_sync_unlock(desc); |
ae88a23b IM |
1565 | |
1566 | unregister_handler_proc(irq, action); | |
1567 | ||
1568 | /* Make sure it's not being used on another CPU: */ | |
1569 | synchronize_irq(irq); | |
1da177e4 | 1570 | |
70edcd77 | 1571 | #ifdef CONFIG_DEBUG_SHIRQ |
ae88a23b IM |
1572 | /* |
1573 | * It's a shared IRQ -- the driver ought to be prepared for an IRQ | |
1574 | * event to happen even now it's being freed, so let's make sure that | |
1575 | * is so by doing an extra call to the handler .... | |
1576 | * | |
1577 | * ( We do this after actually deregistering it, to make sure that a | |
1578 | * 'real' IRQ doesn't run in * parallel with our fake. ) | |
1579 | */ | |
1580 | if (action->flags & IRQF_SHARED) { | |
1581 | local_irq_save(flags); | |
1582 | action->handler(irq, dev_id); | |
1583 | local_irq_restore(flags); | |
1da177e4 | 1584 | } |
ae88a23b | 1585 | #endif |
2d860ad7 LT |
1586 | |
1587 | if (action->thread) { | |
05d74efa | 1588 | kthread_stop(action->thread); |
2d860ad7 | 1589 | put_task_struct(action->thread); |
2a1d3ab8 TG |
1590 | if (action->secondary && action->secondary->thread) { |
1591 | kthread_stop(action->secondary->thread); | |
1592 | put_task_struct(action->secondary->thread); | |
1593 | } | |
2d860ad7 LT |
1594 | } |
1595 | ||
19d39a38 | 1596 | /* Last action releases resources */ |
2343877f | 1597 | if (!desc->action) { |
19d39a38 TG |
1598 | /* |
1599 | * Reaquire bus lock as irq_release_resources() might | |
1600 | * require it to deallocate resources over the slow bus. | |
1601 | */ | |
1602 | chip_bus_lock(desc); | |
46e48e25 | 1603 | irq_release_resources(desc); |
19d39a38 | 1604 | chip_bus_sync_unlock(desc); |
2343877f TG |
1605 | irq_remove_timings(desc); |
1606 | } | |
46e48e25 | 1607 | |
9114014c TG |
1608 | mutex_unlock(&desc->request_mutex); |
1609 | ||
be45beb2 | 1610 | irq_chip_pm_put(&desc->irq_data); |
b6873807 | 1611 | module_put(desc->owner); |
2a1d3ab8 | 1612 | kfree(action->secondary); |
f21cfb25 MD |
1613 | return action; |
1614 | } | |
1615 | ||
cbf94f06 MD |
1616 | /** |
1617 | * remove_irq - free an interrupt | |
1618 | * @irq: Interrupt line to free | |
1619 | * @act: irqaction for the interrupt | |
1620 | * | |
1621 | * Used to remove interrupts statically setup by the early boot process. | |
1622 | */ | |
1623 | void remove_irq(unsigned int irq, struct irqaction *act) | |
1624 | { | |
31d9d9b6 MZ |
1625 | struct irq_desc *desc = irq_to_desc(irq); |
1626 | ||
1627 | if (desc && !WARN_ON(irq_settings_is_per_cpu_devid(desc))) | |
a7e60e55 | 1628 | __free_irq(irq, act->dev_id); |
cbf94f06 | 1629 | } |
eb53b4e8 | 1630 | EXPORT_SYMBOL_GPL(remove_irq); |
cbf94f06 | 1631 | |
f21cfb25 MD |
1632 | /** |
1633 | * free_irq - free an interrupt allocated with request_irq | |
1634 | * @irq: Interrupt line to free | |
1635 | * @dev_id: Device identity to free | |
1636 | * | |
1637 | * Remove an interrupt handler. The handler is removed and if the | |
1638 | * interrupt line is no longer in use by any driver it is disabled. | |
1639 | * On a shared IRQ the caller must ensure the interrupt is disabled | |
1640 | * on the card it drives before calling this function. The function | |
1641 | * does not return until any executing interrupts for this IRQ | |
1642 | * have completed. | |
1643 | * | |
1644 | * This function must not be called from interrupt context. | |
25ce4be7 CH |
1645 | * |
1646 | * Returns the devname argument passed to request_irq. | |
f21cfb25 | 1647 | */ |
25ce4be7 | 1648 | const void *free_irq(unsigned int irq, void *dev_id) |
f21cfb25 | 1649 | { |
70aedd24 | 1650 | struct irq_desc *desc = irq_to_desc(irq); |
25ce4be7 CH |
1651 | struct irqaction *action; |
1652 | const char *devname; | |
70aedd24 | 1653 | |
31d9d9b6 | 1654 | if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc))) |
25ce4be7 | 1655 | return NULL; |
70aedd24 | 1656 | |
cd7eab44 BH |
1657 | #ifdef CONFIG_SMP |
1658 | if (WARN_ON(desc->affinity_notify)) | |
1659 | desc->affinity_notify = NULL; | |
1660 | #endif | |
1661 | ||
25ce4be7 | 1662 | action = __free_irq(irq, dev_id); |
2827a418 AM |
1663 | |
1664 | if (!action) | |
1665 | return NULL; | |
1666 | ||
25ce4be7 CH |
1667 | devname = action->name; |
1668 | kfree(action); | |
1669 | return devname; | |
1da177e4 | 1670 | } |
1da177e4 LT |
1671 | EXPORT_SYMBOL(free_irq); |
1672 | ||
1673 | /** | |
3aa551c9 | 1674 | * request_threaded_irq - allocate an interrupt line |
1da177e4 | 1675 | * @irq: Interrupt line to allocate |
3aa551c9 TG |
1676 | * @handler: Function to be called when the IRQ occurs. |
1677 | * Primary handler for threaded interrupts | |
b25c340c TG |
1678 | * If NULL and thread_fn != NULL the default |
1679 | * primary handler is installed | |
f48fe81e TG |
1680 | * @thread_fn: Function called from the irq handler thread |
1681 | * If NULL, no irq thread is created | |
1da177e4 LT |
1682 | * @irqflags: Interrupt type flags |
1683 | * @devname: An ascii name for the claiming device | |
1684 | * @dev_id: A cookie passed back to the handler function | |
1685 | * | |
1686 | * This call allocates interrupt resources and enables the | |
1687 | * interrupt line and IRQ handling. From the point this | |
1688 | * call is made your handler function may be invoked. Since | |
1689 | * your handler function must clear any interrupt the board | |
1690 | * raises, you must take care both to initialise your hardware | |
1691 | * and to set up the interrupt handler in the right order. | |
1692 | * | |
3aa551c9 | 1693 | * If you want to set up a threaded irq handler for your device |
6d21af4f | 1694 | * then you need to supply @handler and @thread_fn. @handler is |
3aa551c9 TG |
1695 | * still called in hard interrupt context and has to check |
1696 | * whether the interrupt originates from the device. If yes it | |
1697 | * needs to disable the interrupt on the device and return | |
39a2eddb | 1698 | * IRQ_WAKE_THREAD which will wake up the handler thread and run |
3aa551c9 TG |
1699 | * @thread_fn. This split handler design is necessary to support |
1700 | * shared interrupts. | |
1701 | * | |
1da177e4 LT |
1702 | * Dev_id must be globally unique. Normally the address of the |
1703 | * device data structure is used as the cookie. Since the handler | |
1704 | * receives this value it makes sense to use it. | |
1705 | * | |
1706 | * If your interrupt is shared you must pass a non NULL dev_id | |
1707 | * as this is required when freeing the interrupt. | |
1708 | * | |
1709 | * Flags: | |
1710 | * | |
3cca53b0 | 1711 | * IRQF_SHARED Interrupt is shared |
0c5d1eb7 | 1712 | * IRQF_TRIGGER_* Specify active edge(s) or level |
1da177e4 LT |
1713 | * |
1714 | */ | |
3aa551c9 TG |
1715 | int request_threaded_irq(unsigned int irq, irq_handler_t handler, |
1716 | irq_handler_t thread_fn, unsigned long irqflags, | |
1717 | const char *devname, void *dev_id) | |
1da177e4 | 1718 | { |
06fcb0c6 | 1719 | struct irqaction *action; |
08678b08 | 1720 | struct irq_desc *desc; |
d3c60047 | 1721 | int retval; |
1da177e4 | 1722 | |
e237a551 CF |
1723 | if (irq == IRQ_NOTCONNECTED) |
1724 | return -ENOTCONN; | |
1725 | ||
1da177e4 LT |
1726 | /* |
1727 | * Sanity-check: shared interrupts must pass in a real dev-ID, | |
1728 | * otherwise we'll have trouble later trying to figure out | |
1729 | * which interrupt is which (messes up the interrupt freeing | |
1730 | * logic etc). | |
17f48034 RW |
1731 | * |
1732 | * Also IRQF_COND_SUSPEND only makes sense for shared interrupts and | |
1733 | * it cannot be set along with IRQF_NO_SUSPEND. | |
1da177e4 | 1734 | */ |
17f48034 RW |
1735 | if (((irqflags & IRQF_SHARED) && !dev_id) || |
1736 | (!(irqflags & IRQF_SHARED) && (irqflags & IRQF_COND_SUSPEND)) || | |
1737 | ((irqflags & IRQF_NO_SUSPEND) && (irqflags & IRQF_COND_SUSPEND))) | |
1da177e4 | 1738 | return -EINVAL; |
7d94f7ca | 1739 | |
cb5bc832 | 1740 | desc = irq_to_desc(irq); |
7d94f7ca | 1741 | if (!desc) |
1da177e4 | 1742 | return -EINVAL; |
7d94f7ca | 1743 | |
31d9d9b6 MZ |
1744 | if (!irq_settings_can_request(desc) || |
1745 | WARN_ON(irq_settings_is_per_cpu_devid(desc))) | |
6550c775 | 1746 | return -EINVAL; |
b25c340c TG |
1747 | |
1748 | if (!handler) { | |
1749 | if (!thread_fn) | |
1750 | return -EINVAL; | |
1751 | handler = irq_default_primary_handler; | |
1752 | } | |
1da177e4 | 1753 | |
45535732 | 1754 | action = kzalloc(sizeof(struct irqaction), GFP_KERNEL); |
1da177e4 LT |
1755 | if (!action) |
1756 | return -ENOMEM; | |
1757 | ||
1758 | action->handler = handler; | |
3aa551c9 | 1759 | action->thread_fn = thread_fn; |
1da177e4 | 1760 | action->flags = irqflags; |
1da177e4 | 1761 | action->name = devname; |
1da177e4 LT |
1762 | action->dev_id = dev_id; |
1763 | ||
be45beb2 | 1764 | retval = irq_chip_pm_get(&desc->irq_data); |
4396f46c SL |
1765 | if (retval < 0) { |
1766 | kfree(action); | |
be45beb2 | 1767 | return retval; |
4396f46c | 1768 | } |
be45beb2 | 1769 | |
d3c60047 | 1770 | retval = __setup_irq(irq, desc, action); |
70aedd24 | 1771 | |
2a1d3ab8 | 1772 | if (retval) { |
be45beb2 | 1773 | irq_chip_pm_put(&desc->irq_data); |
2a1d3ab8 | 1774 | kfree(action->secondary); |
377bf1e4 | 1775 | kfree(action); |
2a1d3ab8 | 1776 | } |
377bf1e4 | 1777 | |
6d83f94d | 1778 | #ifdef CONFIG_DEBUG_SHIRQ_FIXME |
6ce51c43 | 1779 | if (!retval && (irqflags & IRQF_SHARED)) { |
a304e1b8 DW |
1780 | /* |
1781 | * It's a shared IRQ -- the driver ought to be prepared for it | |
1782 | * to happen immediately, so let's make sure.... | |
377bf1e4 AV |
1783 | * We disable the irq to make sure that a 'real' IRQ doesn't |
1784 | * run in parallel with our fake. | |
a304e1b8 | 1785 | */ |
59845b1f | 1786 | unsigned long flags; |
a304e1b8 | 1787 | |
377bf1e4 | 1788 | disable_irq(irq); |
59845b1f | 1789 | local_irq_save(flags); |
377bf1e4 | 1790 | |
59845b1f | 1791 | handler(irq, dev_id); |
377bf1e4 | 1792 | |
59845b1f | 1793 | local_irq_restore(flags); |
377bf1e4 | 1794 | enable_irq(irq); |
a304e1b8 DW |
1795 | } |
1796 | #endif | |
1da177e4 LT |
1797 | return retval; |
1798 | } | |
3aa551c9 | 1799 | EXPORT_SYMBOL(request_threaded_irq); |
ae731f8d MZ |
1800 | |
1801 | /** | |
1802 | * request_any_context_irq - allocate an interrupt line | |
1803 | * @irq: Interrupt line to allocate | |
1804 | * @handler: Function to be called when the IRQ occurs. | |
1805 | * Threaded handler for threaded interrupts. | |
1806 | * @flags: Interrupt type flags | |
1807 | * @name: An ascii name for the claiming device | |
1808 | * @dev_id: A cookie passed back to the handler function | |
1809 | * | |
1810 | * This call allocates interrupt resources and enables the | |
1811 | * interrupt line and IRQ handling. It selects either a | |
1812 | * hardirq or threaded handling method depending on the | |
1813 | * context. | |
1814 | * | |
1815 | * On failure, it returns a negative value. On success, | |
1816 | * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED. | |
1817 | */ | |
1818 | int request_any_context_irq(unsigned int irq, irq_handler_t handler, | |
1819 | unsigned long flags, const char *name, void *dev_id) | |
1820 | { | |
e237a551 | 1821 | struct irq_desc *desc; |
ae731f8d MZ |
1822 | int ret; |
1823 | ||
e237a551 CF |
1824 | if (irq == IRQ_NOTCONNECTED) |
1825 | return -ENOTCONN; | |
1826 | ||
1827 | desc = irq_to_desc(irq); | |
ae731f8d MZ |
1828 | if (!desc) |
1829 | return -EINVAL; | |
1830 | ||
1ccb4e61 | 1831 | if (irq_settings_is_nested_thread(desc)) { |
ae731f8d MZ |
1832 | ret = request_threaded_irq(irq, NULL, handler, |
1833 | flags, name, dev_id); | |
1834 | return !ret ? IRQC_IS_NESTED : ret; | |
1835 | } | |
1836 | ||
1837 | ret = request_irq(irq, handler, flags, name, dev_id); | |
1838 | return !ret ? IRQC_IS_HARDIRQ : ret; | |
1839 | } | |
1840 | EXPORT_SYMBOL_GPL(request_any_context_irq); | |
31d9d9b6 | 1841 | |
1e7c5fd2 | 1842 | void enable_percpu_irq(unsigned int irq, unsigned int type) |
31d9d9b6 MZ |
1843 | { |
1844 | unsigned int cpu = smp_processor_id(); | |
1845 | unsigned long flags; | |
1846 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); | |
1847 | ||
1848 | if (!desc) | |
1849 | return; | |
1850 | ||
f35ad083 MZ |
1851 | /* |
1852 | * If the trigger type is not specified by the caller, then | |
1853 | * use the default for this interrupt. | |
1854 | */ | |
1e7c5fd2 | 1855 | type &= IRQ_TYPE_SENSE_MASK; |
f35ad083 MZ |
1856 | if (type == IRQ_TYPE_NONE) |
1857 | type = irqd_get_trigger_type(&desc->irq_data); | |
1858 | ||
1e7c5fd2 MZ |
1859 | if (type != IRQ_TYPE_NONE) { |
1860 | int ret; | |
1861 | ||
a1ff541a | 1862 | ret = __irq_set_trigger(desc, type); |
1e7c5fd2 MZ |
1863 | |
1864 | if (ret) { | |
32cffdde | 1865 | WARN(1, "failed to set type for IRQ%d\n", irq); |
1e7c5fd2 MZ |
1866 | goto out; |
1867 | } | |
1868 | } | |
1869 | ||
31d9d9b6 | 1870 | irq_percpu_enable(desc, cpu); |
1e7c5fd2 | 1871 | out: |
31d9d9b6 MZ |
1872 | irq_put_desc_unlock(desc, flags); |
1873 | } | |
36a5df85 | 1874 | EXPORT_SYMBOL_GPL(enable_percpu_irq); |
31d9d9b6 | 1875 | |
f0cb3220 TP |
1876 | /** |
1877 | * irq_percpu_is_enabled - Check whether the per cpu irq is enabled | |
1878 | * @irq: Linux irq number to check for | |
1879 | * | |
1880 | * Must be called from a non migratable context. Returns the enable | |
1881 | * state of a per cpu interrupt on the current cpu. | |
1882 | */ | |
1883 | bool irq_percpu_is_enabled(unsigned int irq) | |
1884 | { | |
1885 | unsigned int cpu = smp_processor_id(); | |
1886 | struct irq_desc *desc; | |
1887 | unsigned long flags; | |
1888 | bool is_enabled; | |
1889 | ||
1890 | desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); | |
1891 | if (!desc) | |
1892 | return false; | |
1893 | ||
1894 | is_enabled = cpumask_test_cpu(cpu, desc->percpu_enabled); | |
1895 | irq_put_desc_unlock(desc, flags); | |
1896 | ||
1897 | return is_enabled; | |
1898 | } | |
1899 | EXPORT_SYMBOL_GPL(irq_percpu_is_enabled); | |
1900 | ||
31d9d9b6 MZ |
1901 | void disable_percpu_irq(unsigned int irq) |
1902 | { | |
1903 | unsigned int cpu = smp_processor_id(); | |
1904 | unsigned long flags; | |
1905 | struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_PERCPU); | |
1906 | ||
1907 | if (!desc) | |
1908 | return; | |
1909 | ||
1910 | irq_percpu_disable(desc, cpu); | |
1911 | irq_put_desc_unlock(desc, flags); | |
1912 | } | |
36a5df85 | 1913 | EXPORT_SYMBOL_GPL(disable_percpu_irq); |
31d9d9b6 MZ |
1914 | |
1915 | /* | |
1916 | * Internal function to unregister a percpu irqaction. | |
1917 | */ | |
1918 | static struct irqaction *__free_percpu_irq(unsigned int irq, void __percpu *dev_id) | |
1919 | { | |
1920 | struct irq_desc *desc = irq_to_desc(irq); | |
1921 | struct irqaction *action; | |
1922 | unsigned long flags; | |
1923 | ||
1924 | WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq); | |
1925 | ||
1926 | if (!desc) | |
1927 | return NULL; | |
1928 | ||
1929 | raw_spin_lock_irqsave(&desc->lock, flags); | |
1930 | ||
1931 | action = desc->action; | |
1932 | if (!action || action->percpu_dev_id != dev_id) { | |
1933 | WARN(1, "Trying to free already-free IRQ %d\n", irq); | |
1934 | goto bad; | |
1935 | } | |
1936 | ||
1937 | if (!cpumask_empty(desc->percpu_enabled)) { | |
1938 | WARN(1, "percpu IRQ %d still enabled on CPU%d!\n", | |
1939 | irq, cpumask_first(desc->percpu_enabled)); | |
1940 | goto bad; | |
1941 | } | |
1942 | ||
1943 | /* Found it - now remove it from the list of entries: */ | |
1944 | desc->action = NULL; | |
1945 | ||
1946 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
1947 | ||
1948 | unregister_handler_proc(irq, action); | |
1949 | ||
be45beb2 | 1950 | irq_chip_pm_put(&desc->irq_data); |
31d9d9b6 MZ |
1951 | module_put(desc->owner); |
1952 | return action; | |
1953 | ||
1954 | bad: | |
1955 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
1956 | return NULL; | |
1957 | } | |
1958 | ||
1959 | /** | |
1960 | * remove_percpu_irq - free a per-cpu interrupt | |
1961 | * @irq: Interrupt line to free | |
1962 | * @act: irqaction for the interrupt | |
1963 | * | |
1964 | * Used to remove interrupts statically setup by the early boot process. | |
1965 | */ | |
1966 | void remove_percpu_irq(unsigned int irq, struct irqaction *act) | |
1967 | { | |
1968 | struct irq_desc *desc = irq_to_desc(irq); | |
1969 | ||
1970 | if (desc && irq_settings_is_per_cpu_devid(desc)) | |
1971 | __free_percpu_irq(irq, act->percpu_dev_id); | |
1972 | } | |
1973 | ||
1974 | /** | |
1975 | * free_percpu_irq - free an interrupt allocated with request_percpu_irq | |
1976 | * @irq: Interrupt line to free | |
1977 | * @dev_id: Device identity to free | |
1978 | * | |
1979 | * Remove a percpu interrupt handler. The handler is removed, but | |
1980 | * the interrupt line is not disabled. This must be done on each | |
1981 | * CPU before calling this function. The function does not return | |
1982 | * until any executing interrupts for this IRQ have completed. | |
1983 | * | |
1984 | * This function must not be called from interrupt context. | |
1985 | */ | |
1986 | void free_percpu_irq(unsigned int irq, void __percpu *dev_id) | |
1987 | { | |
1988 | struct irq_desc *desc = irq_to_desc(irq); | |
1989 | ||
1990 | if (!desc || !irq_settings_is_per_cpu_devid(desc)) | |
1991 | return; | |
1992 | ||
1993 | chip_bus_lock(desc); | |
1994 | kfree(__free_percpu_irq(irq, dev_id)); | |
1995 | chip_bus_sync_unlock(desc); | |
1996 | } | |
aec2e2ad | 1997 | EXPORT_SYMBOL_GPL(free_percpu_irq); |
31d9d9b6 MZ |
1998 | |
1999 | /** | |
2000 | * setup_percpu_irq - setup a per-cpu interrupt | |
2001 | * @irq: Interrupt line to setup | |
2002 | * @act: irqaction for the interrupt | |
2003 | * | |
2004 | * Used to statically setup per-cpu interrupts in the early boot process. | |
2005 | */ | |
2006 | int setup_percpu_irq(unsigned int irq, struct irqaction *act) | |
2007 | { | |
2008 | struct irq_desc *desc = irq_to_desc(irq); | |
2009 | int retval; | |
2010 | ||
2011 | if (!desc || !irq_settings_is_per_cpu_devid(desc)) | |
2012 | return -EINVAL; | |
be45beb2 JH |
2013 | |
2014 | retval = irq_chip_pm_get(&desc->irq_data); | |
2015 | if (retval < 0) | |
2016 | return retval; | |
2017 | ||
31d9d9b6 | 2018 | retval = __setup_irq(irq, desc, act); |
31d9d9b6 | 2019 | |
be45beb2 JH |
2020 | if (retval) |
2021 | irq_chip_pm_put(&desc->irq_data); | |
2022 | ||
31d9d9b6 MZ |
2023 | return retval; |
2024 | } | |
2025 | ||
2026 | /** | |
c80081b9 | 2027 | * __request_percpu_irq - allocate a percpu interrupt line |
31d9d9b6 MZ |
2028 | * @irq: Interrupt line to allocate |
2029 | * @handler: Function to be called when the IRQ occurs. | |
c80081b9 | 2030 | * @flags: Interrupt type flags (IRQF_TIMER only) |
31d9d9b6 MZ |
2031 | * @devname: An ascii name for the claiming device |
2032 | * @dev_id: A percpu cookie passed back to the handler function | |
2033 | * | |
a1b7febd MR |
2034 | * This call allocates interrupt resources and enables the |
2035 | * interrupt on the local CPU. If the interrupt is supposed to be | |
2036 | * enabled on other CPUs, it has to be done on each CPU using | |
2037 | * enable_percpu_irq(). | |
31d9d9b6 MZ |
2038 | * |
2039 | * Dev_id must be globally unique. It is a per-cpu variable, and | |
2040 | * the handler gets called with the interrupted CPU's instance of | |
2041 | * that variable. | |
2042 | */ | |
c80081b9 DL |
2043 | int __request_percpu_irq(unsigned int irq, irq_handler_t handler, |
2044 | unsigned long flags, const char *devname, | |
2045 | void __percpu *dev_id) | |
31d9d9b6 MZ |
2046 | { |
2047 | struct irqaction *action; | |
2048 | struct irq_desc *desc; | |
2049 | int retval; | |
2050 | ||
2051 | if (!dev_id) | |
2052 | return -EINVAL; | |
2053 | ||
2054 | desc = irq_to_desc(irq); | |
2055 | if (!desc || !irq_settings_can_request(desc) || | |
2056 | !irq_settings_is_per_cpu_devid(desc)) | |
2057 | return -EINVAL; | |
2058 | ||
c80081b9 DL |
2059 | if (flags && flags != IRQF_TIMER) |
2060 | return -EINVAL; | |
2061 | ||
31d9d9b6 MZ |
2062 | action = kzalloc(sizeof(struct irqaction), GFP_KERNEL); |
2063 | if (!action) | |
2064 | return -ENOMEM; | |
2065 | ||
2066 | action->handler = handler; | |
c80081b9 | 2067 | action->flags = flags | IRQF_PERCPU | IRQF_NO_SUSPEND; |
31d9d9b6 MZ |
2068 | action->name = devname; |
2069 | action->percpu_dev_id = dev_id; | |
2070 | ||
be45beb2 | 2071 | retval = irq_chip_pm_get(&desc->irq_data); |
4396f46c SL |
2072 | if (retval < 0) { |
2073 | kfree(action); | |
be45beb2 | 2074 | return retval; |
4396f46c | 2075 | } |
be45beb2 | 2076 | |
31d9d9b6 | 2077 | retval = __setup_irq(irq, desc, action); |
31d9d9b6 | 2078 | |
be45beb2 JH |
2079 | if (retval) { |
2080 | irq_chip_pm_put(&desc->irq_data); | |
31d9d9b6 | 2081 | kfree(action); |
be45beb2 | 2082 | } |
31d9d9b6 MZ |
2083 | |
2084 | return retval; | |
2085 | } | |
c80081b9 | 2086 | EXPORT_SYMBOL_GPL(__request_percpu_irq); |
1b7047ed MZ |
2087 | |
2088 | /** | |
2089 | * irq_get_irqchip_state - returns the irqchip state of a interrupt. | |
2090 | * @irq: Interrupt line that is forwarded to a VM | |
2091 | * @which: One of IRQCHIP_STATE_* the caller wants to know about | |
2092 | * @state: a pointer to a boolean where the state is to be storeed | |
2093 | * | |
2094 | * This call snapshots the internal irqchip state of an | |
2095 | * interrupt, returning into @state the bit corresponding to | |
2096 | * stage @which | |
2097 | * | |
2098 | * This function should be called with preemption disabled if the | |
2099 | * interrupt controller has per-cpu registers. | |
2100 | */ | |
2101 | int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which, | |
2102 | bool *state) | |
2103 | { | |
2104 | struct irq_desc *desc; | |
2105 | struct irq_data *data; | |
2106 | struct irq_chip *chip; | |
2107 | unsigned long flags; | |
2108 | int err = -EINVAL; | |
2109 | ||
2110 | desc = irq_get_desc_buslock(irq, &flags, 0); | |
2111 | if (!desc) | |
2112 | return err; | |
2113 | ||
2114 | data = irq_desc_get_irq_data(desc); | |
2115 | ||
2116 | do { | |
2117 | chip = irq_data_get_irq_chip(data); | |
2118 | if (chip->irq_get_irqchip_state) | |
2119 | break; | |
2120 | #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY | |
2121 | data = data->parent_data; | |
2122 | #else | |
2123 | data = NULL; | |
2124 | #endif | |
2125 | } while (data); | |
2126 | ||
2127 | if (data) | |
2128 | err = chip->irq_get_irqchip_state(data, which, state); | |
2129 | ||
2130 | irq_put_desc_busunlock(desc, flags); | |
2131 | return err; | |
2132 | } | |
1ee4fb3e | 2133 | EXPORT_SYMBOL_GPL(irq_get_irqchip_state); |
1b7047ed MZ |
2134 | |
2135 | /** | |
2136 | * irq_set_irqchip_state - set the state of a forwarded interrupt. | |
2137 | * @irq: Interrupt line that is forwarded to a VM | |
2138 | * @which: State to be restored (one of IRQCHIP_STATE_*) | |
2139 | * @val: Value corresponding to @which | |
2140 | * | |
2141 | * This call sets the internal irqchip state of an interrupt, | |
2142 | * depending on the value of @which. | |
2143 | * | |
2144 | * This function should be called with preemption disabled if the | |
2145 | * interrupt controller has per-cpu registers. | |
2146 | */ | |
2147 | int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, | |
2148 | bool val) | |
2149 | { | |
2150 | struct irq_desc *desc; | |
2151 | struct irq_data *data; | |
2152 | struct irq_chip *chip; | |
2153 | unsigned long flags; | |
2154 | int err = -EINVAL; | |
2155 | ||
2156 | desc = irq_get_desc_buslock(irq, &flags, 0); | |
2157 | if (!desc) | |
2158 | return err; | |
2159 | ||
2160 | data = irq_desc_get_irq_data(desc); | |
2161 | ||
2162 | do { | |
2163 | chip = irq_data_get_irq_chip(data); | |
2164 | if (chip->irq_set_irqchip_state) | |
2165 | break; | |
2166 | #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY | |
2167 | data = data->parent_data; | |
2168 | #else | |
2169 | data = NULL; | |
2170 | #endif | |
2171 | } while (data); | |
2172 | ||
2173 | if (data) | |
2174 | err = chip->irq_set_irqchip_state(data, which, val); | |
2175 | ||
2176 | irq_put_desc_busunlock(desc, flags); | |
2177 | return err; | |
2178 | } | |
1ee4fb3e | 2179 | EXPORT_SYMBOL_GPL(irq_set_irqchip_state); |