Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 : * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
5 : *
6 : * This file contains the core interrupt handling code, for irq-chip based
7 : * architectures. Detailed information is available in
8 : * Documentation/core-api/genericirq.rst
9 : */
10 :
11 : #include <linux/irq.h>
12 : #include <linux/msi.h>
13 : #include <linux/module.h>
14 : #include <linux/interrupt.h>
15 : #include <linux/kernel_stat.h>
16 : #include <linux/irqdomain.h>
17 :
18 : #include <trace/events/irq.h>
19 :
20 : #include "internals.h"
21 :
22 0 : static irqreturn_t bad_chained_irq(int irq, void *dev_id)
23 : {
24 0 : WARN_ONCE(1, "Chained irq %d should not call an action\n", irq);
25 0 : return IRQ_NONE;
26 : }
27 :
28 : /*
29 : * Chained handlers should never call action on their IRQ. This default
30 : * action will emit warning if such thing happens.
31 : */
32 : struct irqaction chained_action = {
33 : .handler = bad_chained_irq,
34 : };
35 :
36 : /**
37 : * irq_set_chip - set the irq chip for an irq
38 : * @irq: irq number
39 : * @chip: pointer to irq chip description structure
40 : */
41 64 : int irq_set_chip(unsigned int irq, const struct irq_chip *chip)
42 : {
43 : unsigned long flags;
44 64 : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
45 :
46 64 : if (!desc)
47 : return -EINVAL;
48 :
49 64 : desc->irq_data.chip = (struct irq_chip *)(chip ?: &no_irq_chip);
50 128 : irq_put_desc_unlock(desc, flags);
51 : /*
52 : * For !CONFIG_SPARSE_IRQ make the irq show up in
53 : * allocated_irqs.
54 : */
55 64 : irq_mark_irq(irq);
56 64 : return 0;
57 : }
58 : EXPORT_SYMBOL(irq_set_chip);
59 :
60 : /**
61 : * irq_set_irq_type - set the irq trigger type for an irq
62 : * @irq: irq number
63 : * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
64 : */
65 0 : int irq_set_irq_type(unsigned int irq, unsigned int type)
66 : {
67 : unsigned long flags;
68 0 : struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
69 0 : int ret = 0;
70 :
71 0 : if (!desc)
72 : return -EINVAL;
73 :
74 0 : ret = __irq_set_trigger(desc, type);
75 0 : irq_put_desc_busunlock(desc, flags);
76 0 : return ret;
77 : }
78 : EXPORT_SYMBOL(irq_set_irq_type);
79 :
80 : /**
81 : * irq_set_handler_data - set irq handler data for an irq
82 : * @irq: Interrupt number
83 : * @data: Pointer to interrupt specific data
84 : *
85 : * Set the hardware irq controller data for an irq
86 : */
87 0 : int irq_set_handler_data(unsigned int irq, void *data)
88 : {
89 : unsigned long flags;
90 0 : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
91 :
92 0 : if (!desc)
93 : return -EINVAL;
94 0 : desc->irq_common_data.handler_data = data;
95 0 : irq_put_desc_unlock(desc, flags);
96 0 : return 0;
97 : }
98 : EXPORT_SYMBOL(irq_set_handler_data);
99 :
100 : /**
101 : * irq_set_msi_desc_off - set MSI descriptor data for an irq at offset
102 : * @irq_base: Interrupt number base
103 : * @irq_offset: Interrupt number offset
104 : * @entry: Pointer to MSI descriptor data
105 : *
106 : * Set the MSI descriptor entry for an irq at offset
107 : */
108 0 : int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
109 : struct msi_desc *entry)
110 : {
111 : unsigned long flags;
112 0 : struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
113 :
114 0 : if (!desc)
115 : return -EINVAL;
116 0 : desc->irq_common_data.msi_desc = entry;
117 0 : if (entry && !irq_offset)
118 0 : entry->irq = irq_base;
119 0 : irq_put_desc_unlock(desc, flags);
120 0 : return 0;
121 : }
122 :
123 : /**
124 : * irq_set_msi_desc - set MSI descriptor data for an irq
125 : * @irq: Interrupt number
126 : * @entry: Pointer to MSI descriptor data
127 : *
128 : * Set the MSI descriptor entry for an irq
129 : */
130 0 : int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
131 : {
132 0 : return irq_set_msi_desc_off(irq, 0, entry);
133 : }
134 :
135 : /**
136 : * irq_set_chip_data - set irq chip data for an irq
137 : * @irq: Interrupt number
138 : * @data: Pointer to chip specific data
139 : *
140 : * Set the hardware irq chip data for an irq
141 : */
142 0 : int irq_set_chip_data(unsigned int irq, void *data)
143 : {
144 : unsigned long flags;
145 0 : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
146 :
147 0 : if (!desc)
148 : return -EINVAL;
149 0 : desc->irq_data.chip_data = data;
150 0 : irq_put_desc_unlock(desc, flags);
151 0 : return 0;
152 : }
153 : EXPORT_SYMBOL(irq_set_chip_data);
154 :
155 0 : struct irq_data *irq_get_irq_data(unsigned int irq)
156 : {
157 0 : struct irq_desc *desc = irq_to_desc(irq);
158 :
159 0 : return desc ? &desc->irq_data : NULL;
160 : }
161 : EXPORT_SYMBOL_GPL(irq_get_irq_data);
162 :
163 : static void irq_state_clr_disabled(struct irq_desc *desc)
164 : {
165 4 : irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
166 : }
167 :
168 : static void irq_state_clr_masked(struct irq_desc *desc)
169 : {
170 4 : irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
171 : }
172 :
173 : static void irq_state_clr_started(struct irq_desc *desc)
174 : {
175 0 : irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED);
176 : }
177 :
178 : static void irq_state_set_started(struct irq_desc *desc)
179 : {
180 4 : irqd_set(&desc->irq_data, IRQD_IRQ_STARTED);
181 : }
182 :
183 : enum {
184 : IRQ_STARTUP_NORMAL,
185 : IRQ_STARTUP_MANAGED,
186 : IRQ_STARTUP_ABORT,
187 : };
188 :
189 : #ifdef CONFIG_SMP
190 : static int
191 : __irq_startup_managed(struct irq_desc *desc, const struct cpumask *aff,
192 : bool force)
193 : {
194 : struct irq_data *d = irq_desc_get_irq_data(desc);
195 :
196 : if (!irqd_affinity_is_managed(d))
197 : return IRQ_STARTUP_NORMAL;
198 :
199 : irqd_clr_managed_shutdown(d);
200 :
201 : if (cpumask_any_and(aff, cpu_online_mask) >= nr_cpu_ids) {
202 : /*
203 : * Catch code which fiddles with enable_irq() on a managed
204 : * and potentially shutdown IRQ. Chained interrupt
205 : * installment or irq auto probing should not happen on
206 : * managed irqs either.
207 : */
208 : if (WARN_ON_ONCE(force))
209 : return IRQ_STARTUP_ABORT;
210 : /*
211 : * The interrupt was requested, but there is no online CPU
212 : * in it's affinity mask. Put it into managed shutdown
213 : * state and let the cpu hotplug mechanism start it up once
214 : * a CPU in the mask becomes available.
215 : */
216 : return IRQ_STARTUP_ABORT;
217 : }
218 : /*
219 : * Managed interrupts have reserved resources, so this should not
220 : * happen.
221 : */
222 : if (WARN_ON(irq_domain_activate_irq(d, false)))
223 : return IRQ_STARTUP_ABORT;
224 : return IRQ_STARTUP_MANAGED;
225 : }
226 : #else
227 : static __always_inline int
228 : __irq_startup_managed(struct irq_desc *desc, const struct cpumask *aff,
229 : bool force)
230 : {
231 : return IRQ_STARTUP_NORMAL;
232 : }
233 : #endif
234 :
235 2 : static int __irq_startup(struct irq_desc *desc)
236 : {
237 2 : struct irq_data *d = irq_desc_get_irq_data(desc);
238 2 : int ret = 0;
239 :
240 : /* Warn if this interrupt is not activated but try nevertheless */
241 2 : WARN_ON_ONCE(!irqd_is_activated(d));
242 :
243 2 : if (d->chip->irq_startup) {
244 0 : ret = d->chip->irq_startup(d);
245 0 : irq_state_clr_disabled(desc);
246 : irq_state_clr_masked(desc);
247 : } else {
248 2 : irq_enable(desc);
249 : }
250 2 : irq_state_set_started(desc);
251 2 : return ret;
252 : }
253 :
254 2 : int irq_startup(struct irq_desc *desc, bool resend, bool force)
255 : {
256 2 : struct irq_data *d = irq_desc_get_irq_data(desc);
257 2 : const struct cpumask *aff = irq_data_get_affinity_mask(d);
258 2 : int ret = 0;
259 :
260 2 : desc->depth = 0;
261 :
262 2 : if (irqd_is_started(d)) {
263 0 : irq_enable(desc);
264 : } else {
265 2 : switch (__irq_startup_managed(desc, aff, force)) {
266 : case IRQ_STARTUP_NORMAL:
267 : if (d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP)
268 : irq_setup_affinity(desc);
269 2 : ret = __irq_startup(desc);
270 : if (!(d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP))
271 : irq_setup_affinity(desc);
272 : break;
273 : case IRQ_STARTUP_MANAGED:
274 : irq_do_set_affinity(d, aff, false);
275 : ret = __irq_startup(desc);
276 : break;
277 : case IRQ_STARTUP_ABORT:
278 : irqd_set_managed_shutdown(d);
279 : return 0;
280 : }
281 : }
282 2 : if (resend)
283 2 : check_irq_resend(desc, false);
284 :
285 : return ret;
286 : }
287 :
288 2 : int irq_activate(struct irq_desc *desc)
289 : {
290 2 : struct irq_data *d = irq_desc_get_irq_data(desc);
291 :
292 2 : if (!irqd_affinity_is_managed(d))
293 2 : return irq_domain_activate_irq(d, false);
294 : return 0;
295 : }
296 :
297 0 : int irq_activate_and_startup(struct irq_desc *desc, bool resend)
298 : {
299 0 : if (WARN_ON(irq_activate(desc)))
300 : return 0;
301 0 : return irq_startup(desc, resend, IRQ_START_FORCE);
302 : }
303 :
304 : static void __irq_disable(struct irq_desc *desc, bool mask);
305 :
306 0 : void irq_shutdown(struct irq_desc *desc)
307 : {
308 0 : if (irqd_is_started(&desc->irq_data)) {
309 0 : desc->depth = 1;
310 0 : if (desc->irq_data.chip->irq_shutdown) {
311 0 : desc->irq_data.chip->irq_shutdown(&desc->irq_data);
312 0 : irq_state_set_disabled(desc);
313 : irq_state_set_masked(desc);
314 : } else {
315 0 : __irq_disable(desc, true);
316 : }
317 : irq_state_clr_started(desc);
318 : }
319 0 : }
320 :
321 :
322 0 : void irq_shutdown_and_deactivate(struct irq_desc *desc)
323 : {
324 0 : irq_shutdown(desc);
325 : /*
326 : * This must be called even if the interrupt was never started up,
327 : * because the activation can happen before the interrupt is
328 : * available for request/startup. It has it's own state tracking so
329 : * it's safe to call it unconditionally.
330 : */
331 0 : irq_domain_deactivate_irq(&desc->irq_data);
332 0 : }
333 :
334 2 : void irq_enable(struct irq_desc *desc)
335 : {
336 4 : if (!irqd_irq_disabled(&desc->irq_data)) {
337 : unmask_irq(desc);
338 : } else {
339 2 : irq_state_clr_disabled(desc);
340 2 : if (desc->irq_data.chip->irq_enable) {
341 2 : desc->irq_data.chip->irq_enable(&desc->irq_data);
342 : irq_state_clr_masked(desc);
343 : } else {
344 : unmask_irq(desc);
345 : }
346 : }
347 2 : }
348 :
349 0 : static void __irq_disable(struct irq_desc *desc, bool mask)
350 : {
351 0 : if (irqd_irq_disabled(&desc->irq_data)) {
352 0 : if (mask)
353 : mask_irq(desc);
354 : } else {
355 0 : irq_state_set_disabled(desc);
356 0 : if (desc->irq_data.chip->irq_disable) {
357 0 : desc->irq_data.chip->irq_disable(&desc->irq_data);
358 : irq_state_set_masked(desc);
359 0 : } else if (mask) {
360 : mask_irq(desc);
361 : }
362 : }
363 0 : }
364 :
365 : /**
366 : * irq_disable - Mark interrupt disabled
367 : * @desc: irq descriptor which should be disabled
368 : *
369 : * If the chip does not implement the irq_disable callback, we
370 : * use a lazy disable approach. That means we mark the interrupt
371 : * disabled, but leave the hardware unmasked. That's an
372 : * optimization because we avoid the hardware access for the
373 : * common case where no interrupt happens after we marked it
374 : * disabled. If an interrupt happens, then the interrupt flow
375 : * handler masks the line at the hardware level and marks it
376 : * pending.
377 : *
378 : * If the interrupt chip does not implement the irq_disable callback,
379 : * a driver can disable the lazy approach for a particular irq line by
380 : * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
381 : * be used for devices which cannot disable the interrupt at the
382 : * device level under certain circumstances and have to use
383 : * disable_irq[_nosync] instead.
384 : */
385 0 : void irq_disable(struct irq_desc *desc)
386 : {
387 0 : __irq_disable(desc, irq_settings_disable_unlazy(desc));
388 0 : }
389 :
390 0 : void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
391 : {
392 0 : if (desc->irq_data.chip->irq_enable)
393 0 : desc->irq_data.chip->irq_enable(&desc->irq_data);
394 : else
395 0 : desc->irq_data.chip->irq_unmask(&desc->irq_data);
396 0 : cpumask_set_cpu(cpu, desc->percpu_enabled);
397 0 : }
398 :
399 0 : void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
400 : {
401 0 : if (desc->irq_data.chip->irq_disable)
402 0 : desc->irq_data.chip->irq_disable(&desc->irq_data);
403 : else
404 0 : desc->irq_data.chip->irq_mask(&desc->irq_data);
405 0 : cpumask_clear_cpu(cpu, desc->percpu_enabled);
406 0 : }
407 :
408 0 : static inline void mask_ack_irq(struct irq_desc *desc)
409 : {
410 0 : if (desc->irq_data.chip->irq_mask_ack) {
411 0 : desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
412 : irq_state_set_masked(desc);
413 : } else {
414 0 : mask_irq(desc);
415 0 : if (desc->irq_data.chip->irq_ack)
416 0 : desc->irq_data.chip->irq_ack(&desc->irq_data);
417 : }
418 0 : }
419 :
420 0 : void mask_irq(struct irq_desc *desc)
421 : {
422 0 : if (irqd_irq_masked(&desc->irq_data))
423 : return;
424 :
425 0 : if (desc->irq_data.chip->irq_mask) {
426 0 : desc->irq_data.chip->irq_mask(&desc->irq_data);
427 : irq_state_set_masked(desc);
428 : }
429 : }
430 :
431 0 : void unmask_irq(struct irq_desc *desc)
432 : {
433 0 : if (!irqd_irq_masked(&desc->irq_data))
434 : return;
435 :
436 0 : if (desc->irq_data.chip->irq_unmask) {
437 0 : desc->irq_data.chip->irq_unmask(&desc->irq_data);
438 : irq_state_clr_masked(desc);
439 : }
440 : }
441 :
442 0 : void unmask_threaded_irq(struct irq_desc *desc)
443 : {
444 0 : struct irq_chip *chip = desc->irq_data.chip;
445 :
446 0 : if (chip->flags & IRQCHIP_EOI_THREADED)
447 0 : chip->irq_eoi(&desc->irq_data);
448 :
449 0 : unmask_irq(desc);
450 0 : }
451 :
452 : /*
453 : * handle_nested_irq - Handle a nested irq from a irq thread
454 : * @irq: the interrupt number
455 : *
456 : * Handle interrupts which are nested into a threaded interrupt
457 : * handler. The handler function is called inside the calling
458 : * threads context.
459 : */
460 0 : void handle_nested_irq(unsigned int irq)
461 : {
462 0 : struct irq_desc *desc = irq_to_desc(irq);
463 : struct irqaction *action;
464 : irqreturn_t action_ret;
465 :
466 : might_sleep();
467 :
468 0 : raw_spin_lock_irq(&desc->lock);
469 :
470 0 : desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
471 :
472 0 : action = desc->action;
473 0 : if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
474 0 : desc->istate |= IRQS_PENDING;
475 0 : goto out_unlock;
476 : }
477 :
478 0 : kstat_incr_irqs_this_cpu(desc);
479 0 : irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
480 0 : raw_spin_unlock_irq(&desc->lock);
481 :
482 0 : action_ret = IRQ_NONE;
483 0 : for_each_action_of_desc(desc, action)
484 0 : action_ret |= action->thread_fn(action->irq, action->dev_id);
485 :
486 0 : if (!irq_settings_no_debug(desc))
487 0 : note_interrupt(desc, action_ret);
488 :
489 0 : raw_spin_lock_irq(&desc->lock);
490 0 : irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
491 :
492 : out_unlock:
493 0 : raw_spin_unlock_irq(&desc->lock);
494 0 : }
495 : EXPORT_SYMBOL_GPL(handle_nested_irq);
496 :
497 : static bool irq_check_poll(struct irq_desc *desc)
498 : {
499 0 : if (!(desc->istate & IRQS_POLL_INPROGRESS))
500 : return false;
501 0 : return irq_wait_for_poll(desc);
502 : }
503 :
504 2943 : static bool irq_may_run(struct irq_desc *desc)
505 : {
506 2943 : unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
507 :
508 : /*
509 : * If the interrupt is not in progress and is not an armed
510 : * wakeup interrupt, proceed.
511 : */
512 5886 : if (!irqd_has_set(&desc->irq_data, mask))
513 : return true;
514 :
515 : /*
516 : * If the interrupt is an armed wakeup source, mark it pending
517 : * and suspended, disable it and notify the pm core about the
518 : * event.
519 : */
520 0 : if (irq_pm_check_wakeup(desc))
521 : return false;
522 :
523 : /*
524 : * Handle a potential concurrent poll on a different core.
525 : */
526 : return irq_check_poll(desc);
527 : }
528 :
529 : /**
530 : * handle_simple_irq - Simple and software-decoded IRQs.
531 : * @desc: the interrupt description structure for this irq
532 : *
533 : * Simple interrupts are either sent from a demultiplexing interrupt
534 : * handler or come from hardware, where no interrupt hardware control
535 : * is necessary.
536 : *
537 : * Note: The caller is expected to handle the ack, clear, mask and
538 : * unmask issues if necessary.
539 : */
540 0 : void handle_simple_irq(struct irq_desc *desc)
541 : {
542 0 : raw_spin_lock(&desc->lock);
543 :
544 0 : if (!irq_may_run(desc))
545 : goto out_unlock;
546 :
547 0 : desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
548 :
549 0 : if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
550 0 : desc->istate |= IRQS_PENDING;
551 0 : goto out_unlock;
552 : }
553 :
554 0 : kstat_incr_irqs_this_cpu(desc);
555 0 : handle_irq_event(desc);
556 :
557 : out_unlock:
558 0 : raw_spin_unlock(&desc->lock);
559 0 : }
560 : EXPORT_SYMBOL_GPL(handle_simple_irq);
561 :
562 : /**
563 : * handle_untracked_irq - Simple and software-decoded IRQs.
564 : * @desc: the interrupt description structure for this irq
565 : *
566 : * Untracked interrupts are sent from a demultiplexing interrupt
567 : * handler when the demultiplexer does not know which device it its
568 : * multiplexed irq domain generated the interrupt. IRQ's handled
569 : * through here are not subjected to stats tracking, randomness, or
570 : * spurious interrupt detection.
571 : *
572 : * Note: Like handle_simple_irq, the caller is expected to handle
573 : * the ack, clear, mask and unmask issues if necessary.
574 : */
575 0 : void handle_untracked_irq(struct irq_desc *desc)
576 : {
577 0 : raw_spin_lock(&desc->lock);
578 :
579 0 : if (!irq_may_run(desc))
580 : goto out_unlock;
581 :
582 0 : desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
583 :
584 0 : if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
585 0 : desc->istate |= IRQS_PENDING;
586 0 : goto out_unlock;
587 : }
588 :
589 0 : desc->istate &= ~IRQS_PENDING;
590 0 : irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
591 0 : raw_spin_unlock(&desc->lock);
592 :
593 0 : __handle_irq_event_percpu(desc);
594 :
595 0 : raw_spin_lock(&desc->lock);
596 0 : irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
597 :
598 : out_unlock:
599 0 : raw_spin_unlock(&desc->lock);
600 0 : }
601 : EXPORT_SYMBOL_GPL(handle_untracked_irq);
602 :
603 : /*
604 : * Called unconditionally from handle_level_irq() and only for oneshot
605 : * interrupts from handle_fasteoi_irq()
606 : */
607 0 : static void cond_unmask_irq(struct irq_desc *desc)
608 : {
609 : /*
610 : * We need to unmask in the following cases:
611 : * - Standard level irq (IRQF_ONESHOT is not set)
612 : * - Oneshot irq which did not wake the thread (caused by a
613 : * spurious interrupt or a primary handler handling it
614 : * completely).
615 : */
616 0 : if (!irqd_irq_disabled(&desc->irq_data) &&
617 0 : irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
618 : unmask_irq(desc);
619 0 : }
620 :
621 : /**
622 : * handle_level_irq - Level type irq handler
623 : * @desc: the interrupt description structure for this irq
624 : *
625 : * Level type interrupts are active as long as the hardware line has
626 : * the active level. This may require to mask the interrupt and unmask
627 : * it after the associated handler has acknowledged the device, so the
628 : * interrupt line is back to inactive.
629 : */
630 0 : void handle_level_irq(struct irq_desc *desc)
631 : {
632 0 : raw_spin_lock(&desc->lock);
633 0 : mask_ack_irq(desc);
634 :
635 0 : if (!irq_may_run(desc))
636 : goto out_unlock;
637 :
638 0 : desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
639 :
640 : /*
641 : * If its disabled or no action available
642 : * keep it masked and get out of here
643 : */
644 0 : if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
645 0 : desc->istate |= IRQS_PENDING;
646 0 : goto out_unlock;
647 : }
648 :
649 0 : kstat_incr_irqs_this_cpu(desc);
650 0 : handle_irq_event(desc);
651 :
652 0 : cond_unmask_irq(desc);
653 :
654 : out_unlock:
655 0 : raw_spin_unlock(&desc->lock);
656 0 : }
657 : EXPORT_SYMBOL_GPL(handle_level_irq);
658 :
659 0 : static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
660 : {
661 0 : if (!(desc->istate & IRQS_ONESHOT)) {
662 0 : chip->irq_eoi(&desc->irq_data);
663 : return;
664 : }
665 : /*
666 : * We need to unmask in the following cases:
667 : * - Oneshot irq which did not wake the thread (caused by a
668 : * spurious interrupt or a primary handler handling it
669 : * completely).
670 : */
671 0 : if (!irqd_irq_disabled(&desc->irq_data) &&
672 0 : irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
673 0 : chip->irq_eoi(&desc->irq_data);
674 : unmask_irq(desc);
675 0 : } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
676 0 : chip->irq_eoi(&desc->irq_data);
677 : }
678 : }
679 :
680 : /**
681 : * handle_fasteoi_irq - irq handler for transparent controllers
682 : * @desc: the interrupt description structure for this irq
683 : *
684 : * Only a single callback will be issued to the chip: an ->eoi()
685 : * call when the interrupt has been serviced. This enables support
686 : * for modern forms of interrupt handlers, which handle the flow
687 : * details in hardware, transparently.
688 : */
689 0 : void handle_fasteoi_irq(struct irq_desc *desc)
690 : {
691 0 : struct irq_chip *chip = desc->irq_data.chip;
692 :
693 0 : raw_spin_lock(&desc->lock);
694 :
695 0 : if (!irq_may_run(desc))
696 : goto out;
697 :
698 0 : desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
699 :
700 : /*
701 : * If its disabled or no action available
702 : * then mask it and get out of here:
703 : */
704 0 : if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
705 0 : desc->istate |= IRQS_PENDING;
706 : mask_irq(desc);
707 : goto out;
708 : }
709 :
710 0 : kstat_incr_irqs_this_cpu(desc);
711 0 : if (desc->istate & IRQS_ONESHOT)
712 : mask_irq(desc);
713 :
714 0 : handle_irq_event(desc);
715 :
716 0 : cond_unmask_eoi_irq(desc, chip);
717 :
718 0 : raw_spin_unlock(&desc->lock);
719 0 : return;
720 : out:
721 0 : if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
722 0 : chip->irq_eoi(&desc->irq_data);
723 0 : raw_spin_unlock(&desc->lock);
724 : }
725 : EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
726 :
727 : /**
728 : * handle_fasteoi_nmi - irq handler for NMI interrupt lines
729 : * @desc: the interrupt description structure for this irq
730 : *
731 : * A simple NMI-safe handler, considering the restrictions
732 : * from request_nmi.
733 : *
734 : * Only a single callback will be issued to the chip: an ->eoi()
735 : * call when the interrupt has been serviced. This enables support
736 : * for modern forms of interrupt handlers, which handle the flow
737 : * details in hardware, transparently.
738 : */
739 0 : void handle_fasteoi_nmi(struct irq_desc *desc)
740 : {
741 0 : struct irq_chip *chip = irq_desc_get_chip(desc);
742 0 : struct irqaction *action = desc->action;
743 0 : unsigned int irq = irq_desc_get_irq(desc);
744 : irqreturn_t res;
745 :
746 0 : __kstat_incr_irqs_this_cpu(desc);
747 :
748 0 : trace_irq_handler_entry(irq, action);
749 : /*
750 : * NMIs cannot be shared, there is only one action.
751 : */
752 0 : res = action->handler(irq, action->dev_id);
753 0 : trace_irq_handler_exit(irq, action, res);
754 :
755 0 : if (chip->irq_eoi)
756 0 : chip->irq_eoi(&desc->irq_data);
757 0 : }
758 : EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);
759 :
760 : /**
761 : * handle_edge_irq - edge type IRQ handler
762 : * @desc: the interrupt description structure for this irq
763 : *
764 : * Interrupt occurs on the falling and/or rising edge of a hardware
765 : * signal. The occurrence is latched into the irq controller hardware
766 : * and must be acked in order to be reenabled. After the ack another
767 : * interrupt can happen on the same source even before the first one
768 : * is handled by the associated event handler. If this happens it
769 : * might be necessary to disable (mask) the interrupt depending on the
770 : * controller hardware. This requires to reenable the interrupt inside
771 : * of the loop which handles the interrupts which have arrived while
772 : * the handler was running. If all pending interrupts are handled, the
773 : * loop is left.
774 : */
775 2943 : void handle_edge_irq(struct irq_desc *desc)
776 : {
777 2943 : raw_spin_lock(&desc->lock);
778 :
779 2943 : desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
780 :
781 2943 : if (!irq_may_run(desc)) {
782 0 : desc->istate |= IRQS_PENDING;
783 0 : mask_ack_irq(desc);
784 0 : goto out_unlock;
785 : }
786 :
787 : /*
788 : * If its disabled or no action available then mask it and get
789 : * out of here.
790 : */
791 5886 : if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
792 0 : desc->istate |= IRQS_PENDING;
793 0 : mask_ack_irq(desc);
794 0 : goto out_unlock;
795 : }
796 :
797 2943 : kstat_incr_irqs_this_cpu(desc);
798 :
799 : /* Start handling the irq */
800 2943 : desc->irq_data.chip->irq_ack(&desc->irq_data);
801 :
802 : do {
803 2943 : if (unlikely(!desc->action)) {
804 : mask_irq(desc);
805 : goto out_unlock;
806 : }
807 :
808 : /*
809 : * When another irq arrived while we were handling
810 : * one, we could have masked the irq.
811 : * Reenable it, if it was not disabled in meantime.
812 : */
813 2943 : if (unlikely(desc->istate & IRQS_PENDING)) {
814 0 : if (!irqd_irq_disabled(&desc->irq_data) &&
815 0 : irqd_irq_masked(&desc->irq_data))
816 : unmask_irq(desc);
817 : }
818 :
819 2943 : handle_irq_event(desc);
820 :
821 2943 : } while ((desc->istate & IRQS_PENDING) &&
822 2943 : !irqd_irq_disabled(&desc->irq_data));
823 :
824 : out_unlock:
825 2943 : raw_spin_unlock(&desc->lock);
826 2943 : }
827 : EXPORT_SYMBOL(handle_edge_irq);
828 :
829 : #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
830 : /**
831 : * handle_edge_eoi_irq - edge eoi type IRQ handler
832 : * @desc: the interrupt description structure for this irq
833 : *
834 : * Similar as the above handle_edge_irq, but using eoi and w/o the
835 : * mask/unmask logic.
836 : */
837 : void handle_edge_eoi_irq(struct irq_desc *desc)
838 : {
839 : struct irq_chip *chip = irq_desc_get_chip(desc);
840 :
841 : raw_spin_lock(&desc->lock);
842 :
843 : desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
844 :
845 : if (!irq_may_run(desc)) {
846 : desc->istate |= IRQS_PENDING;
847 : goto out_eoi;
848 : }
849 :
850 : /*
851 : * If its disabled or no action available then mask it and get
852 : * out of here.
853 : */
854 : if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
855 : desc->istate |= IRQS_PENDING;
856 : goto out_eoi;
857 : }
858 :
859 : kstat_incr_irqs_this_cpu(desc);
860 :
861 : do {
862 : if (unlikely(!desc->action))
863 : goto out_eoi;
864 :
865 : handle_irq_event(desc);
866 :
867 : } while ((desc->istate & IRQS_PENDING) &&
868 : !irqd_irq_disabled(&desc->irq_data));
869 :
870 : out_eoi:
871 : chip->irq_eoi(&desc->irq_data);
872 : raw_spin_unlock(&desc->lock);
873 : }
874 : #endif
875 :
876 : /**
877 : * handle_percpu_irq - Per CPU local irq handler
878 : * @desc: the interrupt description structure for this irq
879 : *
880 : * Per CPU interrupts on SMP machines without locking requirements
881 : */
882 0 : void handle_percpu_irq(struct irq_desc *desc)
883 : {
884 0 : struct irq_chip *chip = irq_desc_get_chip(desc);
885 :
886 : /*
887 : * PER CPU interrupts are not serialized. Do not touch
888 : * desc->tot_count.
889 : */
890 0 : __kstat_incr_irqs_this_cpu(desc);
891 :
892 0 : if (chip->irq_ack)
893 0 : chip->irq_ack(&desc->irq_data);
894 :
895 0 : handle_irq_event_percpu(desc);
896 :
897 0 : if (chip->irq_eoi)
898 0 : chip->irq_eoi(&desc->irq_data);
899 0 : }
900 :
901 : /**
902 : * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
903 : * @desc: the interrupt description structure for this irq
904 : *
905 : * Per CPU interrupts on SMP machines without locking requirements. Same as
906 : * handle_percpu_irq() above but with the following extras:
907 : *
908 : * action->percpu_dev_id is a pointer to percpu variables which
909 : * contain the real device id for the cpu on which this handler is
910 : * called
911 : */
912 0 : void handle_percpu_devid_irq(struct irq_desc *desc)
913 : {
914 0 : struct irq_chip *chip = irq_desc_get_chip(desc);
915 0 : struct irqaction *action = desc->action;
916 0 : unsigned int irq = irq_desc_get_irq(desc);
917 : irqreturn_t res;
918 :
919 : /*
920 : * PER CPU interrupts are not serialized. Do not touch
921 : * desc->tot_count.
922 : */
923 0 : __kstat_incr_irqs_this_cpu(desc);
924 :
925 0 : if (chip->irq_ack)
926 0 : chip->irq_ack(&desc->irq_data);
927 :
928 0 : if (likely(action)) {
929 0 : trace_irq_handler_entry(irq, action);
930 0 : res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
931 0 : trace_irq_handler_exit(irq, action, res);
932 : } else {
933 0 : unsigned int cpu = smp_processor_id();
934 0 : bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
935 :
936 0 : if (enabled)
937 0 : irq_percpu_disable(desc, cpu);
938 :
939 0 : pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
940 : enabled ? " and unmasked" : "", irq, cpu);
941 : }
942 :
943 0 : if (chip->irq_eoi)
944 0 : chip->irq_eoi(&desc->irq_data);
945 0 : }
946 :
947 : /**
948 : * handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
949 : * dev ids
950 : * @desc: the interrupt description structure for this irq
951 : *
952 : * Similar to handle_fasteoi_nmi, but handling the dev_id cookie
953 : * as a percpu pointer.
954 : */
955 0 : void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
956 : {
957 0 : struct irq_chip *chip = irq_desc_get_chip(desc);
958 0 : struct irqaction *action = desc->action;
959 0 : unsigned int irq = irq_desc_get_irq(desc);
960 : irqreturn_t res;
961 :
962 0 : __kstat_incr_irqs_this_cpu(desc);
963 :
964 0 : trace_irq_handler_entry(irq, action);
965 0 : res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
966 0 : trace_irq_handler_exit(irq, action, res);
967 :
968 0 : if (chip->irq_eoi)
969 0 : chip->irq_eoi(&desc->irq_data);
970 0 : }
971 :
972 : static void
973 64 : __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
974 : int is_chained, const char *name)
975 : {
976 64 : if (!handle) {
977 : handle = handle_bad_irq;
978 : } else {
979 64 : struct irq_data *irq_data = &desc->irq_data;
980 : #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
981 : /*
982 : * With hierarchical domains we might run into a
983 : * situation where the outermost chip is not yet set
984 : * up, but the inner chips are there. Instead of
985 : * bailing we install the handler, but obviously we
986 : * cannot enable/startup the interrupt at this point.
987 : */
988 128 : while (irq_data) {
989 64 : if (irq_data->chip != &no_irq_chip)
990 : break;
991 : /*
992 : * Bail out if the outer chip is not set up
993 : * and the interrupt supposed to be started
994 : * right away.
995 : */
996 0 : if (WARN_ON(is_chained))
997 : return;
998 : /* Try the parent */
999 0 : irq_data = irq_data->parent_data;
1000 : }
1001 : #endif
1002 64 : if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
1003 : return;
1004 : }
1005 :
1006 : /* Uninstall? */
1007 64 : if (handle == handle_bad_irq) {
1008 0 : if (desc->irq_data.chip != &no_irq_chip)
1009 0 : mask_ack_irq(desc);
1010 0 : irq_state_set_disabled(desc);
1011 0 : if (is_chained) {
1012 0 : desc->action = NULL;
1013 0 : WARN_ON(irq_chip_pm_put(irq_desc_get_irq_data(desc)));
1014 : }
1015 0 : desc->depth = 1;
1016 : }
1017 64 : desc->handle_irq = handle;
1018 64 : desc->name = name;
1019 :
1020 64 : if (handle != handle_bad_irq && is_chained) {
1021 0 : unsigned int type = irqd_get_trigger_type(&desc->irq_data);
1022 :
1023 : /*
1024 : * We're about to start this interrupt immediately,
1025 : * hence the need to set the trigger configuration.
1026 : * But the .set_type callback may have overridden the
1027 : * flow handler, ignoring that we're dealing with a
1028 : * chained interrupt. Reset it immediately because we
1029 : * do know better.
1030 : */
1031 0 : if (type != IRQ_TYPE_NONE) {
1032 0 : __irq_set_trigger(desc, type);
1033 0 : desc->handle_irq = handle;
1034 : }
1035 :
1036 0 : irq_settings_set_noprobe(desc);
1037 0 : irq_settings_set_norequest(desc);
1038 0 : irq_settings_set_nothread(desc);
1039 0 : desc->action = &chained_action;
1040 0 : WARN_ON(irq_chip_pm_get(irq_desc_get_irq_data(desc)));
1041 0 : irq_activate_and_startup(desc, IRQ_RESEND);
1042 : }
1043 : }
1044 :
1045 : void
1046 64 : __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1047 : const char *name)
1048 : {
1049 : unsigned long flags;
1050 64 : struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1051 :
1052 64 : if (!desc)
1053 0 : return;
1054 :
1055 64 : __irq_do_set_handler(desc, handle, is_chained, name);
1056 128 : irq_put_desc_busunlock(desc, flags);
1057 : }
1058 : EXPORT_SYMBOL_GPL(__irq_set_handler);
1059 :
1060 : void
1061 0 : irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1062 : void *data)
1063 : {
1064 : unsigned long flags;
1065 0 : struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1066 :
1067 0 : if (!desc)
1068 0 : return;
1069 :
1070 0 : desc->irq_common_data.handler_data = data;
1071 0 : __irq_do_set_handler(desc, handle, 1, NULL);
1072 :
1073 0 : irq_put_desc_busunlock(desc, flags);
1074 : }
1075 : EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1076 :
1077 : void
1078 64 : irq_set_chip_and_handler_name(unsigned int irq, const struct irq_chip *chip,
1079 : irq_flow_handler_t handle, const char *name)
1080 : {
1081 64 : irq_set_chip(irq, chip);
1082 64 : __irq_set_handler(irq, handle, 0, name);
1083 64 : }
1084 : EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1085 :
1086 0 : void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1087 : {
1088 : unsigned long flags, trigger, tmp;
1089 0 : struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1090 :
1091 0 : if (!desc)
1092 0 : return;
1093 :
1094 : /*
1095 : * Warn when a driver sets the no autoenable flag on an already
1096 : * active interrupt.
1097 : */
1098 0 : WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1099 :
1100 0 : irq_settings_clr_and_set(desc, clr, set);
1101 :
1102 0 : trigger = irqd_get_trigger_type(&desc->irq_data);
1103 :
1104 0 : irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1105 : IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1106 0 : if (irq_settings_has_no_balance_set(desc))
1107 0 : irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1108 0 : if (irq_settings_is_per_cpu(desc))
1109 0 : irqd_set(&desc->irq_data, IRQD_PER_CPU);
1110 0 : if (irq_settings_can_move_pcntxt(desc))
1111 0 : irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1112 0 : if (irq_settings_is_level(desc))
1113 0 : irqd_set(&desc->irq_data, IRQD_LEVEL);
1114 :
1115 0 : tmp = irq_settings_get_trigger_mask(desc);
1116 0 : if (tmp != IRQ_TYPE_NONE)
1117 0 : trigger = tmp;
1118 :
1119 0 : irqd_set(&desc->irq_data, trigger);
1120 :
1121 0 : irq_put_desc_unlock(desc, flags);
1122 : }
1123 : EXPORT_SYMBOL_GPL(irq_modify_status);
1124 :
1125 : #ifdef CONFIG_DEPRECATED_IRQ_CPU_ONOFFLINE
1126 : /**
1127 : * irq_cpu_online - Invoke all irq_cpu_online functions.
1128 : *
1129 : * Iterate through all irqs and invoke the chip.irq_cpu_online()
1130 : * for each.
1131 : */
1132 : void irq_cpu_online(void)
1133 : {
1134 : struct irq_desc *desc;
1135 : struct irq_chip *chip;
1136 : unsigned long flags;
1137 : unsigned int irq;
1138 :
1139 : for_each_active_irq(irq) {
1140 : desc = irq_to_desc(irq);
1141 : if (!desc)
1142 : continue;
1143 :
1144 : raw_spin_lock_irqsave(&desc->lock, flags);
1145 :
1146 : chip = irq_data_get_irq_chip(&desc->irq_data);
1147 : if (chip && chip->irq_cpu_online &&
1148 : (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1149 : !irqd_irq_disabled(&desc->irq_data)))
1150 : chip->irq_cpu_online(&desc->irq_data);
1151 :
1152 : raw_spin_unlock_irqrestore(&desc->lock, flags);
1153 : }
1154 : }
1155 :
1156 : /**
1157 : * irq_cpu_offline - Invoke all irq_cpu_offline functions.
1158 : *
1159 : * Iterate through all irqs and invoke the chip.irq_cpu_offline()
1160 : * for each.
1161 : */
1162 : void irq_cpu_offline(void)
1163 : {
1164 : struct irq_desc *desc;
1165 : struct irq_chip *chip;
1166 : unsigned long flags;
1167 : unsigned int irq;
1168 :
1169 : for_each_active_irq(irq) {
1170 : desc = irq_to_desc(irq);
1171 : if (!desc)
1172 : continue;
1173 :
1174 : raw_spin_lock_irqsave(&desc->lock, flags);
1175 :
1176 : chip = irq_data_get_irq_chip(&desc->irq_data);
1177 : if (chip && chip->irq_cpu_offline &&
1178 : (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
1179 : !irqd_irq_disabled(&desc->irq_data)))
1180 : chip->irq_cpu_offline(&desc->irq_data);
1181 :
1182 : raw_spin_unlock_irqrestore(&desc->lock, flags);
1183 : }
1184 : }
1185 : #endif
1186 :
1187 : #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1188 :
1189 : #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
1190 : /**
1191 : * handle_fasteoi_ack_irq - irq handler for edge hierarchy
1192 : * stacked on transparent controllers
1193 : *
1194 : * @desc: the interrupt description structure for this irq
1195 : *
1196 : * Like handle_fasteoi_irq(), but for use with hierarchy where
1197 : * the irq_chip also needs to have its ->irq_ack() function
1198 : * called.
1199 : */
1200 : void handle_fasteoi_ack_irq(struct irq_desc *desc)
1201 : {
1202 : struct irq_chip *chip = desc->irq_data.chip;
1203 :
1204 : raw_spin_lock(&desc->lock);
1205 :
1206 : if (!irq_may_run(desc))
1207 : goto out;
1208 :
1209 : desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1210 :
1211 : /*
1212 : * If its disabled or no action available
1213 : * then mask it and get out of here:
1214 : */
1215 : if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1216 : desc->istate |= IRQS_PENDING;
1217 : mask_irq(desc);
1218 : goto out;
1219 : }
1220 :
1221 : kstat_incr_irqs_this_cpu(desc);
1222 : if (desc->istate & IRQS_ONESHOT)
1223 : mask_irq(desc);
1224 :
1225 : /* Start handling the irq */
1226 : desc->irq_data.chip->irq_ack(&desc->irq_data);
1227 :
1228 : handle_irq_event(desc);
1229 :
1230 : cond_unmask_eoi_irq(desc, chip);
1231 :
1232 : raw_spin_unlock(&desc->lock);
1233 : return;
1234 : out:
1235 : if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1236 : chip->irq_eoi(&desc->irq_data);
1237 : raw_spin_unlock(&desc->lock);
1238 : }
1239 : EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
1240 :
1241 : /**
1242 : * handle_fasteoi_mask_irq - irq handler for level hierarchy
1243 : * stacked on transparent controllers
1244 : *
1245 : * @desc: the interrupt description structure for this irq
1246 : *
1247 : * Like handle_fasteoi_irq(), but for use with hierarchy where
1248 : * the irq_chip also needs to have its ->irq_mask_ack() function
1249 : * called.
1250 : */
1251 : void handle_fasteoi_mask_irq(struct irq_desc *desc)
1252 : {
1253 : struct irq_chip *chip = desc->irq_data.chip;
1254 :
1255 : raw_spin_lock(&desc->lock);
1256 : mask_ack_irq(desc);
1257 :
1258 : if (!irq_may_run(desc))
1259 : goto out;
1260 :
1261 : desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
1262 :
1263 : /*
1264 : * If its disabled or no action available
1265 : * then mask it and get out of here:
1266 : */
1267 : if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
1268 : desc->istate |= IRQS_PENDING;
1269 : mask_irq(desc);
1270 : goto out;
1271 : }
1272 :
1273 : kstat_incr_irqs_this_cpu(desc);
1274 : if (desc->istate & IRQS_ONESHOT)
1275 : mask_irq(desc);
1276 :
1277 : handle_irq_event(desc);
1278 :
1279 : cond_unmask_eoi_irq(desc, chip);
1280 :
1281 : raw_spin_unlock(&desc->lock);
1282 : return;
1283 : out:
1284 : if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1285 : chip->irq_eoi(&desc->irq_data);
1286 : raw_spin_unlock(&desc->lock);
1287 : }
1288 : EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
1289 :
1290 : #endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
1291 :
1292 : /**
1293 : * irq_chip_set_parent_state - set the state of a parent interrupt.
1294 : *
1295 : * @data: Pointer to interrupt specific data
1296 : * @which: State to be restored (one of IRQCHIP_STATE_*)
1297 : * @val: Value corresponding to @which
1298 : *
1299 : * Conditional success, if the underlying irqchip does not implement it.
1300 : */
1301 0 : int irq_chip_set_parent_state(struct irq_data *data,
1302 : enum irqchip_irq_state which,
1303 : bool val)
1304 : {
1305 0 : data = data->parent_data;
1306 :
1307 0 : if (!data || !data->chip->irq_set_irqchip_state)
1308 : return 0;
1309 :
1310 0 : return data->chip->irq_set_irqchip_state(data, which, val);
1311 : }
1312 : EXPORT_SYMBOL_GPL(irq_chip_set_parent_state);
1313 :
1314 : /**
1315 : * irq_chip_get_parent_state - get the state of a parent interrupt.
1316 : *
1317 : * @data: Pointer to interrupt specific data
1318 : * @which: one of IRQCHIP_STATE_* the caller wants to know
1319 : * @state: a pointer to a boolean where the state is to be stored
1320 : *
1321 : * Conditional success, if the underlying irqchip does not implement it.
1322 : */
1323 0 : int irq_chip_get_parent_state(struct irq_data *data,
1324 : enum irqchip_irq_state which,
1325 : bool *state)
1326 : {
1327 0 : data = data->parent_data;
1328 :
1329 0 : if (!data || !data->chip->irq_get_irqchip_state)
1330 : return 0;
1331 :
1332 0 : return data->chip->irq_get_irqchip_state(data, which, state);
1333 : }
1334 : EXPORT_SYMBOL_GPL(irq_chip_get_parent_state);
1335 :
1336 : /**
1337 : * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
1338 : * NULL)
1339 : * @data: Pointer to interrupt specific data
1340 : */
1341 0 : void irq_chip_enable_parent(struct irq_data *data)
1342 : {
1343 0 : data = data->parent_data;
1344 0 : if (data->chip->irq_enable)
1345 0 : data->chip->irq_enable(data);
1346 : else
1347 0 : data->chip->irq_unmask(data);
1348 0 : }
1349 : EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
1350 :
1351 : /**
1352 : * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
1353 : * NULL)
1354 : * @data: Pointer to interrupt specific data
1355 : */
1356 0 : void irq_chip_disable_parent(struct irq_data *data)
1357 : {
1358 0 : data = data->parent_data;
1359 0 : if (data->chip->irq_disable)
1360 0 : data->chip->irq_disable(data);
1361 : else
1362 0 : data->chip->irq_mask(data);
1363 0 : }
1364 : EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
1365 :
1366 : /**
1367 : * irq_chip_ack_parent - Acknowledge the parent interrupt
1368 : * @data: Pointer to interrupt specific data
1369 : */
1370 0 : void irq_chip_ack_parent(struct irq_data *data)
1371 : {
1372 0 : data = data->parent_data;
1373 0 : data->chip->irq_ack(data);
1374 0 : }
1375 : EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
1376 :
1377 : /**
1378 : * irq_chip_mask_parent - Mask the parent interrupt
1379 : * @data: Pointer to interrupt specific data
1380 : */
1381 0 : void irq_chip_mask_parent(struct irq_data *data)
1382 : {
1383 0 : data = data->parent_data;
1384 0 : data->chip->irq_mask(data);
1385 0 : }
1386 : EXPORT_SYMBOL_GPL(irq_chip_mask_parent);
1387 :
1388 : /**
1389 : * irq_chip_mask_ack_parent - Mask and acknowledge the parent interrupt
1390 : * @data: Pointer to interrupt specific data
1391 : */
1392 0 : void irq_chip_mask_ack_parent(struct irq_data *data)
1393 : {
1394 0 : data = data->parent_data;
1395 0 : data->chip->irq_mask_ack(data);
1396 0 : }
1397 : EXPORT_SYMBOL_GPL(irq_chip_mask_ack_parent);
1398 :
1399 : /**
1400 : * irq_chip_unmask_parent - Unmask the parent interrupt
1401 : * @data: Pointer to interrupt specific data
1402 : */
1403 0 : void irq_chip_unmask_parent(struct irq_data *data)
1404 : {
1405 0 : data = data->parent_data;
1406 0 : data->chip->irq_unmask(data);
1407 0 : }
1408 : EXPORT_SYMBOL_GPL(irq_chip_unmask_parent);
1409 :
1410 : /**
1411 : * irq_chip_eoi_parent - Invoke EOI on the parent interrupt
1412 : * @data: Pointer to interrupt specific data
1413 : */
1414 0 : void irq_chip_eoi_parent(struct irq_data *data)
1415 : {
1416 0 : data = data->parent_data;
1417 0 : data->chip->irq_eoi(data);
1418 0 : }
1419 : EXPORT_SYMBOL_GPL(irq_chip_eoi_parent);
1420 :
1421 : /**
1422 : * irq_chip_set_affinity_parent - Set affinity on the parent interrupt
1423 : * @data: Pointer to interrupt specific data
1424 : * @dest: The affinity mask to set
1425 : * @force: Flag to enforce setting (disable online checks)
1426 : *
1427 : * Conditional, as the underlying parent chip might not implement it.
1428 : */
1429 0 : int irq_chip_set_affinity_parent(struct irq_data *data,
1430 : const struct cpumask *dest, bool force)
1431 : {
1432 0 : data = data->parent_data;
1433 0 : if (data->chip->irq_set_affinity)
1434 0 : return data->chip->irq_set_affinity(data, dest, force);
1435 :
1436 : return -ENOSYS;
1437 : }
1438 : EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
1439 :
1440 : /**
1441 : * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
1442 : * @data: Pointer to interrupt specific data
1443 : * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
1444 : *
1445 : * Conditional, as the underlying parent chip might not implement it.
1446 : */
1447 0 : int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1448 : {
1449 0 : data = data->parent_data;
1450 :
1451 0 : if (data->chip->irq_set_type)
1452 0 : return data->chip->irq_set_type(data, type);
1453 :
1454 : return -ENOSYS;
1455 : }
1456 : EXPORT_SYMBOL_GPL(irq_chip_set_type_parent);
1457 :
1458 : /**
1459 : * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
1460 : * @data: Pointer to interrupt specific data
1461 : *
1462 : * Iterate through the domain hierarchy of the interrupt and check
1463 : * whether a hw retrigger function exists. If yes, invoke it.
1464 : */
1465 0 : int irq_chip_retrigger_hierarchy(struct irq_data *data)
1466 : {
1467 0 : for (data = data->parent_data; data; data = data->parent_data)
1468 0 : if (data->chip && data->chip->irq_retrigger)
1469 0 : return data->chip->irq_retrigger(data);
1470 :
1471 : return 0;
1472 : }
1473 : EXPORT_SYMBOL_GPL(irq_chip_retrigger_hierarchy);
1474 :
1475 : /**
1476 : * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
1477 : * @data: Pointer to interrupt specific data
1478 : * @vcpu_info: The vcpu affinity information
1479 : */
1480 0 : int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1481 : {
1482 0 : data = data->parent_data;
1483 0 : if (data->chip->irq_set_vcpu_affinity)
1484 0 : return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1485 :
1486 : return -ENOSYS;
1487 : }
1488 : EXPORT_SYMBOL_GPL(irq_chip_set_vcpu_affinity_parent);
1489 : /**
1490 : * irq_chip_set_wake_parent - Set/reset wake-up on the parent interrupt
1491 : * @data: Pointer to interrupt specific data
1492 : * @on: Whether to set or reset the wake-up capability of this irq
1493 : *
1494 : * Conditional, as the underlying parent chip might not implement it.
1495 : */
1496 0 : int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1497 : {
1498 0 : data = data->parent_data;
1499 :
1500 0 : if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1501 : return 0;
1502 :
1503 0 : if (data->chip->irq_set_wake)
1504 0 : return data->chip->irq_set_wake(data, on);
1505 :
1506 : return -ENOSYS;
1507 : }
1508 : EXPORT_SYMBOL_GPL(irq_chip_set_wake_parent);
1509 :
1510 : /**
1511 : * irq_chip_request_resources_parent - Request resources on the parent interrupt
1512 : * @data: Pointer to interrupt specific data
1513 : */
1514 0 : int irq_chip_request_resources_parent(struct irq_data *data)
1515 : {
1516 0 : data = data->parent_data;
1517 :
1518 0 : if (data->chip->irq_request_resources)
1519 0 : return data->chip->irq_request_resources(data);
1520 :
1521 : /* no error on missing optional irq_chip::irq_request_resources */
1522 : return 0;
1523 : }
1524 : EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);
1525 :
1526 : /**
1527 : * irq_chip_release_resources_parent - Release resources on the parent interrupt
1528 : * @data: Pointer to interrupt specific data
1529 : */
1530 0 : void irq_chip_release_resources_parent(struct irq_data *data)
1531 : {
1532 0 : data = data->parent_data;
1533 0 : if (data->chip->irq_release_resources)
1534 0 : data->chip->irq_release_resources(data);
1535 0 : }
1536 : EXPORT_SYMBOL_GPL(irq_chip_release_resources_parent);
1537 : #endif
1538 :
1539 : /**
1540 : * irq_chip_compose_msi_msg - Compose msi message for a irq chip
1541 : * @data: Pointer to interrupt specific data
1542 : * @msg: Pointer to the MSI message
1543 : *
1544 : * For hierarchical domains we find the first chip in the hierarchy
1545 : * which implements the irq_compose_msi_msg callback. For non
1546 : * hierarchical we use the top level chip.
1547 : */
1548 0 : int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1549 : {
1550 : struct irq_data *pos;
1551 :
1552 0 : for (pos = NULL; !pos && data; data = irqd_get_parent_data(data)) {
1553 0 : if (data->chip && data->chip->irq_compose_msi_msg)
1554 0 : pos = data;
1555 : }
1556 :
1557 0 : if (!pos)
1558 : return -ENOSYS;
1559 :
1560 0 : pos->chip->irq_compose_msi_msg(pos, msg);
1561 0 : return 0;
1562 : }
1563 :
1564 : static struct device *irq_get_pm_device(struct irq_data *data)
1565 : {
1566 2 : if (data->domain)
1567 0 : return data->domain->pm_dev;
1568 :
1569 : return NULL;
1570 : }
1571 :
1572 : /**
1573 : * irq_chip_pm_get - Enable power for an IRQ chip
1574 : * @data: Pointer to interrupt specific data
1575 : *
1576 : * Enable the power to the IRQ chip referenced by the interrupt data
1577 : * structure.
1578 : */
1579 2 : int irq_chip_pm_get(struct irq_data *data)
1580 : {
1581 4 : struct device *dev = irq_get_pm_device(data);
1582 2 : int retval = 0;
1583 :
1584 2 : if (IS_ENABLED(CONFIG_PM) && dev)
1585 0 : retval = pm_runtime_resume_and_get(dev);
1586 :
1587 2 : return retval;
1588 : }
1589 :
1590 : /**
1591 : * irq_chip_pm_put - Disable power for an IRQ chip
1592 : * @data: Pointer to interrupt specific data
1593 : *
1594 : * Disable the power to the IRQ chip referenced by the interrupt data
1595 : * structure, belongs. Note that power will only be disabled, once this
1596 : * function has been called for all IRQs that have called irq_chip_pm_get().
1597 : */
1598 0 : int irq_chip_pm_put(struct irq_data *data)
1599 : {
1600 0 : struct device *dev = irq_get_pm_device(data);
1601 0 : int retval = 0;
1602 :
1603 0 : if (IS_ENABLED(CONFIG_PM) && dev)
1604 0 : retval = pm_runtime_put(dev);
1605 :
1606 0 : return (retval < 0) ? retval : 0;
1607 : }
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