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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
22static irqreturn_t bad_chained_irq(int irq, void *dev_id)
23{
24 WARN_ONCE(1, "Chained irq %d should not call an action\n", irq);
25 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 */
32struct 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 */
41int irq_set_chip(unsigned int irq, const struct irq_chip *chip)
42{
43 unsigned long flags;
44 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
45
46 if (!desc)
47 return -EINVAL;
48
49 desc->irq_data.chip = (struct irq_chip *)(chip ?: &no_irq_chip);
50 irq_put_desc_unlock(desc, flags);
51 /*
52 * For !CONFIG_SPARSE_IRQ make the irq show up in
53 * allocated_irqs.
54 */
55 irq_mark_irq(irq);
56 return 0;
57}
58EXPORT_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 */
65int irq_set_irq_type(unsigned int irq, unsigned int type)
66{
67 unsigned long flags;
68 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
69 int ret = 0;
70
71 if (!desc)
72 return -EINVAL;
73
74 ret = __irq_set_trigger(desc, type);
75 irq_put_desc_busunlock(desc, flags);
76 return ret;
77}
78EXPORT_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 */
87int irq_set_handler_data(unsigned int irq, void *data)
88{
89 unsigned long flags;
90 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
91
92 if (!desc)
93 return -EINVAL;
94 desc->irq_common_data.handler_data = data;
95 irq_put_desc_unlock(desc, flags);
96 return 0;
97}
98EXPORT_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 */
108int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
109 struct msi_desc *entry)
110{
111 unsigned long flags;
112 struct irq_desc *desc = irq_get_desc_lock(irq_base + irq_offset, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
113
114 if (!desc)
115 return -EINVAL;
116 desc->irq_common_data.msi_desc = entry;
117 if (entry && !irq_offset)
118 entry->irq = irq_base;
119 irq_put_desc_unlock(desc, flags);
120 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 */
130int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
131{
132 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 */
142int irq_set_chip_data(unsigned int irq, void *data)
143{
144 unsigned long flags;
145 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
146
147 if (!desc)
148 return -EINVAL;
149 desc->irq_data.chip_data = data;
150 irq_put_desc_unlock(desc, flags);
151 return 0;
152}
153EXPORT_SYMBOL(irq_set_chip_data);
154
155struct irq_data *irq_get_irq_data(unsigned int irq)
156{
157 struct irq_desc *desc = irq_to_desc(irq);
158
159 return desc ? &desc->irq_data : NULL;
160}
161EXPORT_SYMBOL_GPL(irq_get_irq_data);
162
163static void irq_state_clr_disabled(struct irq_desc *desc)
164{
165 irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
166}
167
168static void irq_state_clr_masked(struct irq_desc *desc)
169{
170 irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
171}
172
173static void irq_state_clr_started(struct irq_desc *desc)
174{
175 irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED);
176}
177
178static void irq_state_set_started(struct irq_desc *desc)
179{
180 irqd_set(&desc->irq_data, IRQD_IRQ_STARTED);
181}
182
183enum {
184 IRQ_STARTUP_NORMAL,
185 IRQ_STARTUP_MANAGED,
186 IRQ_STARTUP_ABORT,
187};
188
189#ifdef CONFIG_SMP
190static 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
227static __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
235static int __irq_startup(struct irq_desc *desc)
236{
237 struct irq_data *d = irq_desc_get_irq_data(desc);
238 int ret = 0;
239
240 /* Warn if this interrupt is not activated but try nevertheless */
241 WARN_ON_ONCE(!irqd_is_activated(d));
242
243 if (d->chip->irq_startup) {
244 ret = d->chip->irq_startup(d);
245 irq_state_clr_disabled(desc);
246 irq_state_clr_masked(desc);
247 } else {
248 irq_enable(desc);
249 }
250 irq_state_set_started(desc);
251 return ret;
252}
253
254int irq_startup(struct irq_desc *desc, bool resend, bool force)
255{
256 struct irq_data *d = irq_desc_get_irq_data(desc);
257 const struct cpumask *aff = irq_data_get_affinity_mask(d);
258 int ret = 0;
259
260 desc->depth = 0;
261
262 if (irqd_is_started(d)) {
263 irq_enable(desc);
264 } else {
265 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 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 if (resend)
283 check_irq_resend(desc, false);
284
285 return ret;
286}
287
288int irq_activate(struct irq_desc *desc)
289{
290 struct irq_data *d = irq_desc_get_irq_data(desc);
291
292 if (!irqd_affinity_is_managed(d))
293 return irq_domain_activate_irq(d, false);
294 return 0;
295}
296
297int irq_activate_and_startup(struct irq_desc *desc, bool resend)
298{
299 if (WARN_ON(irq_activate(desc)))
300 return 0;
301 return irq_startup(desc, resend, IRQ_START_FORCE);
302}
303
304static void __irq_disable(struct irq_desc *desc, bool mask);
305
306void irq_shutdown(struct irq_desc *desc)
307{
308 if (irqd_is_started(&desc->irq_data)) {
309 desc->depth = 1;
310 if (desc->irq_data.chip->irq_shutdown) {
311 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
312 irq_state_set_disabled(desc);
313 irq_state_set_masked(desc);
314 } else {
315 __irq_disable(desc, true);
316 }
317 irq_state_clr_started(desc);
318 }
319}
320
321
322void irq_shutdown_and_deactivate(struct irq_desc *desc)
323{
324 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 irq_domain_deactivate_irq(&desc->irq_data);
332}
333
334void irq_enable(struct irq_desc *desc)
335{
336 if (!irqd_irq_disabled(&desc->irq_data)) {
337 unmask_irq(desc);
338 } else {
339 irq_state_clr_disabled(desc);
340 if (desc->irq_data.chip->irq_enable) {
341 desc->irq_data.chip->irq_enable(&desc->irq_data);
342 irq_state_clr_masked(desc);
343 } else {
344 unmask_irq(desc);
345 }
346 }
347}
348
349static void __irq_disable(struct irq_desc *desc, bool mask)
350{
351 if (irqd_irq_disabled(&desc->irq_data)) {
352 if (mask)
353 mask_irq(desc);
354 } else {
355 irq_state_set_disabled(desc);
356 if (desc->irq_data.chip->irq_disable) {
357 desc->irq_data.chip->irq_disable(&desc->irq_data);
358 irq_state_set_masked(desc);
359 } else if (mask) {
360 mask_irq(desc);
361 }
362 }
363}
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 */
385void irq_disable(struct irq_desc *desc)
386{
387 __irq_disable(desc, irq_settings_disable_unlazy(desc));
388}
389
390void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
391{
392 if (desc->irq_data.chip->irq_enable)
393 desc->irq_data.chip->irq_enable(&desc->irq_data);
394 else
395 desc->irq_data.chip->irq_unmask(&desc->irq_data);
396 cpumask_set_cpu(cpu, desc->percpu_enabled);
397}
398
399void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
400{
401 if (desc->irq_data.chip->irq_disable)
402 desc->irq_data.chip->irq_disable(&desc->irq_data);
403 else
404 desc->irq_data.chip->irq_mask(&desc->irq_data);
405 cpumask_clear_cpu(cpu, desc->percpu_enabled);
406}
407
408static inline void mask_ack_irq(struct irq_desc *desc)
409{
410 if (desc->irq_data.chip->irq_mask_ack) {
411 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
412 irq_state_set_masked(desc);
413 } else {
414 mask_irq(desc);
415 if (desc->irq_data.chip->irq_ack)
416 desc->irq_data.chip->irq_ack(&desc->irq_data);
417 }
418}
419
420void mask_irq(struct irq_desc *desc)
421{
422 if (irqd_irq_masked(&desc->irq_data))
423 return;
424
425 if (desc->irq_data.chip->irq_mask) {
426 desc->irq_data.chip->irq_mask(&desc->irq_data);
427 irq_state_set_masked(desc);
428 }
429}
430
431void unmask_irq(struct irq_desc *desc)
432{
433 if (!irqd_irq_masked(&desc->irq_data))
434 return;
435
436 if (desc->irq_data.chip->irq_unmask) {
437 desc->irq_data.chip->irq_unmask(&desc->irq_data);
438 irq_state_clr_masked(desc);
439 }
440}
441
442void unmask_threaded_irq(struct irq_desc *desc)
443{
444 struct irq_chip *chip = desc->irq_data.chip;
445
446 if (chip->flags & IRQCHIP_EOI_THREADED)
447 chip->irq_eoi(&desc->irq_data);
448
449 unmask_irq(desc);
450}
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 */
460void handle_nested_irq(unsigned int irq)
461{
462 struct irq_desc *desc = irq_to_desc(irq);
463 struct irqaction *action;
464 irqreturn_t action_ret;
465
466 might_sleep();
467
468 raw_spin_lock_irq(&desc->lock);
469
470 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
471
472 action = desc->action;
473 if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
474 desc->istate |= IRQS_PENDING;
475 goto out_unlock;
476 }
477
478 kstat_incr_irqs_this_cpu(desc);
479 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
480 raw_spin_unlock_irq(&desc->lock);
481
482 action_ret = IRQ_NONE;
483 for_each_action_of_desc(desc, action)
484 action_ret |= action->thread_fn(action->irq, action->dev_id);
485
486 if (!irq_settings_no_debug(desc))
487 note_interrupt(desc, action_ret);
488
489 raw_spin_lock_irq(&desc->lock);
490 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
491
492out_unlock:
493 raw_spin_unlock_irq(&desc->lock);
494}
495EXPORT_SYMBOL_GPL(handle_nested_irq);
496
497static bool irq_check_poll(struct irq_desc *desc)
498{
499 if (!(desc->istate & IRQS_POLL_INPROGRESS))
500 return false;
501 return irq_wait_for_poll(desc);
502}
503
504static bool irq_may_run(struct irq_desc *desc)
505{
506 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 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 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 */
540void handle_simple_irq(struct irq_desc *desc)
541{
542 raw_spin_lock(&desc->lock);
543
544 if (!irq_may_run(desc))
545 goto out_unlock;
546
547 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
548
549 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
550 desc->istate |= IRQS_PENDING;
551 goto out_unlock;
552 }
553
554 kstat_incr_irqs_this_cpu(desc);
555 handle_irq_event(desc);
556
557out_unlock:
558 raw_spin_unlock(&desc->lock);
559}
560EXPORT_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 */
575void handle_untracked_irq(struct irq_desc *desc)
576{
577 raw_spin_lock(&desc->lock);
578
579 if (!irq_may_run(desc))
580 goto out_unlock;
581
582 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
583
584 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
585 desc->istate |= IRQS_PENDING;
586 goto out_unlock;
587 }
588
589 desc->istate &= ~IRQS_PENDING;
590 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
591 raw_spin_unlock(&desc->lock);
592
593 __handle_irq_event_percpu(desc);
594
595 raw_spin_lock(&desc->lock);
596 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
597
598out_unlock:
599 raw_spin_unlock(&desc->lock);
600}
601EXPORT_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 */
607static 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 if (!irqd_irq_disabled(&desc->irq_data) &&
617 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
618 unmask_irq(desc);
619}
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 */
630void handle_level_irq(struct irq_desc *desc)
631{
632 raw_spin_lock(&desc->lock);
633 mask_ack_irq(desc);
634
635 if (!irq_may_run(desc))
636 goto out_unlock;
637
638 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 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
645 desc->istate |= IRQS_PENDING;
646 goto out_unlock;
647 }
648
649 kstat_incr_irqs_this_cpu(desc);
650 handle_irq_event(desc);
651
652 cond_unmask_irq(desc);
653
654out_unlock:
655 raw_spin_unlock(&desc->lock);
656}
657EXPORT_SYMBOL_GPL(handle_level_irq);
658
659static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
660{
661 if (!(desc->istate & IRQS_ONESHOT)) {
662 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 if (!irqd_irq_disabled(&desc->irq_data) &&
672 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
673 chip->irq_eoi(&desc->irq_data);
674 unmask_irq(desc);
675 } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
676 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 */
689void handle_fasteoi_irq(struct irq_desc *desc)
690{
691 struct irq_chip *chip = desc->irq_data.chip;
692
693 raw_spin_lock(&desc->lock);
694
695 if (!irq_may_run(desc))
696 goto out;
697
698 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 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
705 desc->istate |= IRQS_PENDING;
706 mask_irq(desc);
707 goto out;
708 }
709
710 kstat_incr_irqs_this_cpu(desc);
711 if (desc->istate & IRQS_ONESHOT)
712 mask_irq(desc);
713
714 handle_irq_event(desc);
715
716 cond_unmask_eoi_irq(desc, chip);
717
718 raw_spin_unlock(&desc->lock);
719 return;
720out:
721 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
722 chip->irq_eoi(&desc->irq_data);
723 raw_spin_unlock(&desc->lock);
724}
725EXPORT_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 */
739void handle_fasteoi_nmi(struct irq_desc *desc)
740{
741 struct irq_chip *chip = irq_desc_get_chip(desc);
742 struct irqaction *action = desc->action;
743 unsigned int irq = irq_desc_get_irq(desc);
744 irqreturn_t res;
745
746 __kstat_incr_irqs_this_cpu(desc);
747
748 trace_irq_handler_entry(irq, action);
749 /*
750 * NMIs cannot be shared, there is only one action.
751 */
752 res = action->handler(irq, action->dev_id);
753 trace_irq_handler_exit(irq, action, res);
754
755 if (chip->irq_eoi)
756 chip->irq_eoi(&desc->irq_data);
757}
758EXPORT_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 */
775void handle_edge_irq(struct irq_desc *desc)
776{
777 raw_spin_lock(&desc->lock);
778
779 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
780
781 if (!irq_may_run(desc)) {
782 desc->istate |= IRQS_PENDING;
783 mask_ack_irq(desc);
784 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 if (irqd_irq_disabled(&desc->irq_data) || !desc->action) {
792 desc->istate |= IRQS_PENDING;
793 mask_ack_irq(desc);
794 goto out_unlock;
795 }
796
797 kstat_incr_irqs_this_cpu(desc);
798
799 /* Start handling the irq */
800 desc->irq_data.chip->irq_ack(&desc->irq_data);
801
802 do {
803 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 if (unlikely(desc->istate & IRQS_PENDING)) {
814 if (!irqd_irq_disabled(&desc->irq_data) &&
815 irqd_irq_masked(&desc->irq_data))
816 unmask_irq(desc);
817 }
818
819 handle_irq_event(desc);
820
821 } while ((desc->istate & IRQS_PENDING) &&
822 !irqd_irq_disabled(&desc->irq_data));
823
824out_unlock:
825 raw_spin_unlock(&desc->lock);
826}
827EXPORT_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 */
837void 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
870out_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 */
882void handle_percpu_irq(struct irq_desc *desc)
883{
884 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 __kstat_incr_irqs_this_cpu(desc);
891
892 if (chip->irq_ack)
893 chip->irq_ack(&desc->irq_data);
894
895 handle_irq_event_percpu(desc);
896
897 if (chip->irq_eoi)
898 chip->irq_eoi(&desc->irq_data);
899}
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 */
912void handle_percpu_devid_irq(struct irq_desc *desc)
913{
914 struct irq_chip *chip = irq_desc_get_chip(desc);
915 struct irqaction *action = desc->action;
916 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 __kstat_incr_irqs_this_cpu(desc);
924
925 if (chip->irq_ack)
926 chip->irq_ack(&desc->irq_data);
927
928 if (likely(action)) {
929 trace_irq_handler_entry(irq, action);
930 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
931 trace_irq_handler_exit(irq, action, res);
932 } else {
933 unsigned int cpu = smp_processor_id();
934 bool enabled = cpumask_test_cpu(cpu, desc->percpu_enabled);
935
936 if (enabled)
937 irq_percpu_disable(desc, cpu);
938
939 pr_err_once("Spurious%s percpu IRQ%u on CPU%u\n",
940 enabled ? " and unmasked" : "", irq, cpu);
941 }
942
943 if (chip->irq_eoi)
944 chip->irq_eoi(&desc->irq_data);
945}
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 */
955void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
956{
957 struct irq_chip *chip = irq_desc_get_chip(desc);
958 struct irqaction *action = desc->action;
959 unsigned int irq = irq_desc_get_irq(desc);
960 irqreturn_t res;
961
962 __kstat_incr_irqs_this_cpu(desc);
963
964 trace_irq_handler_entry(irq, action);
965 res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
966 trace_irq_handler_exit(irq, action, res);
967
968 if (chip->irq_eoi)
969 chip->irq_eoi(&desc->irq_data);
970}
971
972static void
973__irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
974 int is_chained, const char *name)
975{
976 if (!handle) {
977 handle = handle_bad_irq;
978 } else {
979 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 while (irq_data) {
989 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 if (WARN_ON(is_chained))
997 return;
998 /* Try the parent */
999 irq_data = irq_data->parent_data;
1000 }
1001#endif
1002 if (WARN_ON(!irq_data || irq_data->chip == &no_irq_chip))
1003 return;
1004 }
1005
1006 /* Uninstall? */
1007 if (handle == handle_bad_irq) {
1008 if (desc->irq_data.chip != &no_irq_chip)
1009 mask_ack_irq(desc);
1010 irq_state_set_disabled(desc);
1011 if (is_chained) {
1012 desc->action = NULL;
1013 WARN_ON(irq_chip_pm_put(irq_desc_get_irq_data(desc)));
1014 }
1015 desc->depth = 1;
1016 }
1017 desc->handle_irq = handle;
1018 desc->name = name;
1019
1020 if (handle != handle_bad_irq && is_chained) {
1021 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 if (type != IRQ_TYPE_NONE) {
1032 __irq_set_trigger(desc, type);
1033 desc->handle_irq = handle;
1034 }
1035
1036 irq_settings_set_noprobe(desc);
1037 irq_settings_set_norequest(desc);
1038 irq_settings_set_nothread(desc);
1039 desc->action = &chained_action;
1040 WARN_ON(irq_chip_pm_get(irq_desc_get_irq_data(desc)));
1041 irq_activate_and_startup(desc, IRQ_RESEND);
1042 }
1043}
1044
1045void
1046__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
1047 const char *name)
1048{
1049 unsigned long flags;
1050 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1051
1052 if (!desc)
1053 return;
1054
1055 __irq_do_set_handler(desc, handle, is_chained, name);
1056 irq_put_desc_busunlock(desc, flags);
1057}
1058EXPORT_SYMBOL_GPL(__irq_set_handler);
1059
1060void
1061irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
1062 void *data)
1063{
1064 unsigned long flags;
1065 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
1066
1067 if (!desc)
1068 return;
1069
1070 desc->irq_common_data.handler_data = data;
1071 __irq_do_set_handler(desc, handle, 1, NULL);
1072
1073 irq_put_desc_busunlock(desc, flags);
1074}
1075EXPORT_SYMBOL_GPL(irq_set_chained_handler_and_data);
1076
1077void
1078irq_set_chip_and_handler_name(unsigned int irq, const struct irq_chip *chip,
1079 irq_flow_handler_t handle, const char *name)
1080{
1081 irq_set_chip(irq, chip);
1082 __irq_set_handler(irq, handle, 0, name);
1083}
1084EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
1085
1086void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
1087{
1088 unsigned long flags, trigger, tmp;
1089 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
1090
1091 if (!desc)
1092 return;
1093
1094 /*
1095 * Warn when a driver sets the no autoenable flag on an already
1096 * active interrupt.
1097 */
1098 WARN_ON_ONCE(!desc->depth && (set & _IRQ_NOAUTOEN));
1099
1100 irq_settings_clr_and_set(desc, clr, set);
1101
1102 trigger = irqd_get_trigger_type(&desc->irq_data);
1103
1104 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
1105 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
1106 if (irq_settings_has_no_balance_set(desc))
1107 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
1108 if (irq_settings_is_per_cpu(desc))
1109 irqd_set(&desc->irq_data, IRQD_PER_CPU);
1110 if (irq_settings_can_move_pcntxt(desc))
1111 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
1112 if (irq_settings_is_level(desc))
1113 irqd_set(&desc->irq_data, IRQD_LEVEL);
1114
1115 tmp = irq_settings_get_trigger_mask(desc);
1116 if (tmp != IRQ_TYPE_NONE)
1117 trigger = tmp;
1118
1119 irqd_set(&desc->irq_data, trigger);
1120
1121 irq_put_desc_unlock(desc, flags);
1122}
1123EXPORT_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 */
1132void 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 */
1162void 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 */
1200void 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;
1234out:
1235 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1236 chip->irq_eoi(&desc->irq_data);
1237 raw_spin_unlock(&desc->lock);
1238}
1239EXPORT_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 */
1251void 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;
1283out:
1284 if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
1285 chip->irq_eoi(&desc->irq_data);
1286 raw_spin_unlock(&desc->lock);
1287}
1288EXPORT_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 */
1301int irq_chip_set_parent_state(struct irq_data *data,
1302 enum irqchip_irq_state which,
1303 bool val)
1304{
1305 data = data->parent_data;
1306
1307 if (!data || !data->chip->irq_set_irqchip_state)
1308 return 0;
1309
1310 return data->chip->irq_set_irqchip_state(data, which, val);
1311}
1312EXPORT_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 */
1323int irq_chip_get_parent_state(struct irq_data *data,
1324 enum irqchip_irq_state which,
1325 bool *state)
1326{
1327 data = data->parent_data;
1328
1329 if (!data || !data->chip->irq_get_irqchip_state)
1330 return 0;
1331
1332 return data->chip->irq_get_irqchip_state(data, which, state);
1333}
1334EXPORT_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 */
1341void irq_chip_enable_parent(struct irq_data *data)
1342{
1343 data = data->parent_data;
1344 if (data->chip->irq_enable)
1345 data->chip->irq_enable(data);
1346 else
1347 data->chip->irq_unmask(data);
1348}
1349EXPORT_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 */
1356void irq_chip_disable_parent(struct irq_data *data)
1357{
1358 data = data->parent_data;
1359 if (data->chip->irq_disable)
1360 data->chip->irq_disable(data);
1361 else
1362 data->chip->irq_mask(data);
1363}
1364EXPORT_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 */
1370void irq_chip_ack_parent(struct irq_data *data)
1371{
1372 data = data->parent_data;
1373 data->chip->irq_ack(data);
1374}
1375EXPORT_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 */
1381void irq_chip_mask_parent(struct irq_data *data)
1382{
1383 data = data->parent_data;
1384 data->chip->irq_mask(data);
1385}
1386EXPORT_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 */
1392void irq_chip_mask_ack_parent(struct irq_data *data)
1393{
1394 data = data->parent_data;
1395 data->chip->irq_mask_ack(data);
1396}
1397EXPORT_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 */
1403void irq_chip_unmask_parent(struct irq_data *data)
1404{
1405 data = data->parent_data;
1406 data->chip->irq_unmask(data);
1407}
1408EXPORT_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 */
1414void irq_chip_eoi_parent(struct irq_data *data)
1415{
1416 data = data->parent_data;
1417 data->chip->irq_eoi(data);
1418}
1419EXPORT_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 */
1429int irq_chip_set_affinity_parent(struct irq_data *data,
1430 const struct cpumask *dest, bool force)
1431{
1432 data = data->parent_data;
1433 if (data->chip->irq_set_affinity)
1434 return data->chip->irq_set_affinity(data, dest, force);
1435
1436 return -ENOSYS;
1437}
1438EXPORT_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 */
1447int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
1448{
1449 data = data->parent_data;
1450
1451 if (data->chip->irq_set_type)
1452 return data->chip->irq_set_type(data, type);
1453
1454 return -ENOSYS;
1455}
1456EXPORT_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 */
1465int irq_chip_retrigger_hierarchy(struct irq_data *data)
1466{
1467 for (data = data->parent_data; data; data = data->parent_data)
1468 if (data->chip && data->chip->irq_retrigger)
1469 return data->chip->irq_retrigger(data);
1470
1471 return 0;
1472}
1473EXPORT_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 */
1480int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
1481{
1482 data = data->parent_data;
1483 if (data->chip->irq_set_vcpu_affinity)
1484 return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
1485
1486 return -ENOSYS;
1487}
1488EXPORT_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 */
1496int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
1497{
1498 data = data->parent_data;
1499
1500 if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
1501 return 0;
1502
1503 if (data->chip->irq_set_wake)
1504 return data->chip->irq_set_wake(data, on);
1505
1506 return -ENOSYS;
1507}
1508EXPORT_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 */
1514int irq_chip_request_resources_parent(struct irq_data *data)
1515{
1516 data = data->parent_data;
1517
1518 if (data->chip->irq_request_resources)
1519 return data->chip->irq_request_resources(data);
1520
1521 /* no error on missing optional irq_chip::irq_request_resources */
1522 return 0;
1523}
1524EXPORT_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 */
1530void irq_chip_release_resources_parent(struct irq_data *data)
1531{
1532 data = data->parent_data;
1533 if (data->chip->irq_release_resources)
1534 data->chip->irq_release_resources(data);
1535}
1536EXPORT_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 */
1548int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
1549{
1550 struct irq_data *pos;
1551
1552 for (pos = NULL; !pos && data; data = irqd_get_parent_data(data)) {
1553 if (data->chip && data->chip->irq_compose_msi_msg)
1554 pos = data;
1555 }
1556
1557 if (!pos)
1558 return -ENOSYS;
1559
1560 pos->chip->irq_compose_msi_msg(pos, msg);
1561 return 0;
1562}
1563
1564static struct device *irq_get_pm_device(struct irq_data *data)
1565{
1566 if (data->domain)
1567 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 */
1579int irq_chip_pm_get(struct irq_data *data)
1580{
1581 struct device *dev = irq_get_pm_device(data);
1582 int retval = 0;
1583
1584 if (IS_ENABLED(CONFIG_PM) && dev)
1585 retval = pm_runtime_resume_and_get(dev);
1586
1587 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 */
1598int irq_chip_pm_put(struct irq_data *data)
1599{
1600 struct device *dev = irq_get_pm_device(data);
1601 int retval = 0;
1602
1603 if (IS_ENABLED(CONFIG_PM) && dev)
1604 retval = pm_runtime_put(dev);
1605
1606 return (retval < 0) ? retval : 0;
1607}
1/*
2 * linux/kernel/irq/chip.c
3 *
4 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
5 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
6 *
7 * This file contains the core interrupt handling code, for irq-chip
8 * based architectures.
9 *
10 * Detailed information is available in Documentation/DocBook/genericirq
11 */
12
13#include <linux/irq.h>
14#include <linux/msi.h>
15#include <linux/module.h>
16#include <linux/interrupt.h>
17#include <linux/kernel_stat.h>
18
19#include <trace/events/irq.h>
20
21#include "internals.h"
22
23/**
24 * irq_set_chip - set the irq chip for an irq
25 * @irq: irq number
26 * @chip: pointer to irq chip description structure
27 */
28int irq_set_chip(unsigned int irq, struct irq_chip *chip)
29{
30 unsigned long flags;
31 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
32
33 if (!desc)
34 return -EINVAL;
35
36 if (!chip)
37 chip = &no_irq_chip;
38
39 desc->irq_data.chip = chip;
40 irq_put_desc_unlock(desc, flags);
41 /*
42 * For !CONFIG_SPARSE_IRQ make the irq show up in
43 * allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
44 * already marked, and this call is harmless.
45 */
46 irq_reserve_irq(irq);
47 return 0;
48}
49EXPORT_SYMBOL(irq_set_chip);
50
51/**
52 * irq_set_type - set the irq trigger type for an irq
53 * @irq: irq number
54 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
55 */
56int irq_set_irq_type(unsigned int irq, unsigned int type)
57{
58 unsigned long flags;
59 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
60 int ret = 0;
61
62 if (!desc)
63 return -EINVAL;
64
65 type &= IRQ_TYPE_SENSE_MASK;
66 ret = __irq_set_trigger(desc, irq, type);
67 irq_put_desc_busunlock(desc, flags);
68 return ret;
69}
70EXPORT_SYMBOL(irq_set_irq_type);
71
72/**
73 * irq_set_handler_data - set irq handler data for an irq
74 * @irq: Interrupt number
75 * @data: Pointer to interrupt specific data
76 *
77 * Set the hardware irq controller data for an irq
78 */
79int irq_set_handler_data(unsigned int irq, void *data)
80{
81 unsigned long flags;
82 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
83
84 if (!desc)
85 return -EINVAL;
86 desc->irq_data.handler_data = data;
87 irq_put_desc_unlock(desc, flags);
88 return 0;
89}
90EXPORT_SYMBOL(irq_set_handler_data);
91
92/**
93 * irq_set_msi_desc - set MSI descriptor data for an irq
94 * @irq: Interrupt number
95 * @entry: Pointer to MSI descriptor data
96 *
97 * Set the MSI descriptor entry for an irq
98 */
99int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
100{
101 unsigned long flags;
102 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
103
104 if (!desc)
105 return -EINVAL;
106 desc->irq_data.msi_desc = entry;
107 if (entry)
108 entry->irq = irq;
109 irq_put_desc_unlock(desc, flags);
110 return 0;
111}
112
113/**
114 * irq_set_chip_data - set irq chip data for an irq
115 * @irq: Interrupt number
116 * @data: Pointer to chip specific data
117 *
118 * Set the hardware irq chip data for an irq
119 */
120int irq_set_chip_data(unsigned int irq, void *data)
121{
122 unsigned long flags;
123 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
124
125 if (!desc)
126 return -EINVAL;
127 desc->irq_data.chip_data = data;
128 irq_put_desc_unlock(desc, flags);
129 return 0;
130}
131EXPORT_SYMBOL(irq_set_chip_data);
132
133struct irq_data *irq_get_irq_data(unsigned int irq)
134{
135 struct irq_desc *desc = irq_to_desc(irq);
136
137 return desc ? &desc->irq_data : NULL;
138}
139EXPORT_SYMBOL_GPL(irq_get_irq_data);
140
141static void irq_state_clr_disabled(struct irq_desc *desc)
142{
143 irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
144}
145
146static void irq_state_set_disabled(struct irq_desc *desc)
147{
148 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
149}
150
151static void irq_state_clr_masked(struct irq_desc *desc)
152{
153 irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
154}
155
156static void irq_state_set_masked(struct irq_desc *desc)
157{
158 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
159}
160
161int irq_startup(struct irq_desc *desc, bool resend)
162{
163 int ret = 0;
164
165 irq_state_clr_disabled(desc);
166 desc->depth = 0;
167
168 if (desc->irq_data.chip->irq_startup) {
169 ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
170 irq_state_clr_masked(desc);
171 } else {
172 irq_enable(desc);
173 }
174 if (resend)
175 check_irq_resend(desc, desc->irq_data.irq);
176 return ret;
177}
178
179void irq_shutdown(struct irq_desc *desc)
180{
181 irq_state_set_disabled(desc);
182 desc->depth = 1;
183 if (desc->irq_data.chip->irq_shutdown)
184 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
185 else if (desc->irq_data.chip->irq_disable)
186 desc->irq_data.chip->irq_disable(&desc->irq_data);
187 else
188 desc->irq_data.chip->irq_mask(&desc->irq_data);
189 irq_state_set_masked(desc);
190}
191
192void irq_enable(struct irq_desc *desc)
193{
194 irq_state_clr_disabled(desc);
195 if (desc->irq_data.chip->irq_enable)
196 desc->irq_data.chip->irq_enable(&desc->irq_data);
197 else
198 desc->irq_data.chip->irq_unmask(&desc->irq_data);
199 irq_state_clr_masked(desc);
200}
201
202void irq_disable(struct irq_desc *desc)
203{
204 irq_state_set_disabled(desc);
205 if (desc->irq_data.chip->irq_disable) {
206 desc->irq_data.chip->irq_disable(&desc->irq_data);
207 irq_state_set_masked(desc);
208 }
209}
210
211void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
212{
213 if (desc->irq_data.chip->irq_enable)
214 desc->irq_data.chip->irq_enable(&desc->irq_data);
215 else
216 desc->irq_data.chip->irq_unmask(&desc->irq_data);
217 cpumask_set_cpu(cpu, desc->percpu_enabled);
218}
219
220void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
221{
222 if (desc->irq_data.chip->irq_disable)
223 desc->irq_data.chip->irq_disable(&desc->irq_data);
224 else
225 desc->irq_data.chip->irq_mask(&desc->irq_data);
226 cpumask_clear_cpu(cpu, desc->percpu_enabled);
227}
228
229static inline void mask_ack_irq(struct irq_desc *desc)
230{
231 if (desc->irq_data.chip->irq_mask_ack)
232 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
233 else {
234 desc->irq_data.chip->irq_mask(&desc->irq_data);
235 if (desc->irq_data.chip->irq_ack)
236 desc->irq_data.chip->irq_ack(&desc->irq_data);
237 }
238 irq_state_set_masked(desc);
239}
240
241void mask_irq(struct irq_desc *desc)
242{
243 if (desc->irq_data.chip->irq_mask) {
244 desc->irq_data.chip->irq_mask(&desc->irq_data);
245 irq_state_set_masked(desc);
246 }
247}
248
249void unmask_irq(struct irq_desc *desc)
250{
251 if (desc->irq_data.chip->irq_unmask) {
252 desc->irq_data.chip->irq_unmask(&desc->irq_data);
253 irq_state_clr_masked(desc);
254 }
255}
256
257/*
258 * handle_nested_irq - Handle a nested irq from a irq thread
259 * @irq: the interrupt number
260 *
261 * Handle interrupts which are nested into a threaded interrupt
262 * handler. The handler function is called inside the calling
263 * threads context.
264 */
265void handle_nested_irq(unsigned int irq)
266{
267 struct irq_desc *desc = irq_to_desc(irq);
268 struct irqaction *action;
269 irqreturn_t action_ret;
270
271 might_sleep();
272
273 raw_spin_lock_irq(&desc->lock);
274
275 kstat_incr_irqs_this_cpu(irq, desc);
276
277 action = desc->action;
278 if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
279 desc->istate |= IRQS_PENDING;
280 goto out_unlock;
281 }
282
283 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
284 raw_spin_unlock_irq(&desc->lock);
285
286 action_ret = action->thread_fn(action->irq, action->dev_id);
287 if (!noirqdebug)
288 note_interrupt(irq, desc, action_ret);
289
290 raw_spin_lock_irq(&desc->lock);
291 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
292
293out_unlock:
294 raw_spin_unlock_irq(&desc->lock);
295}
296EXPORT_SYMBOL_GPL(handle_nested_irq);
297
298static bool irq_check_poll(struct irq_desc *desc)
299{
300 if (!(desc->istate & IRQS_POLL_INPROGRESS))
301 return false;
302 return irq_wait_for_poll(desc);
303}
304
305/**
306 * handle_simple_irq - Simple and software-decoded IRQs.
307 * @irq: the interrupt number
308 * @desc: the interrupt description structure for this irq
309 *
310 * Simple interrupts are either sent from a demultiplexing interrupt
311 * handler or come from hardware, where no interrupt hardware control
312 * is necessary.
313 *
314 * Note: The caller is expected to handle the ack, clear, mask and
315 * unmask issues if necessary.
316 */
317void
318handle_simple_irq(unsigned int irq, struct irq_desc *desc)
319{
320 raw_spin_lock(&desc->lock);
321
322 if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
323 if (!irq_check_poll(desc))
324 goto out_unlock;
325
326 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
327 kstat_incr_irqs_this_cpu(irq, desc);
328
329 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
330 desc->istate |= IRQS_PENDING;
331 goto out_unlock;
332 }
333
334 handle_irq_event(desc);
335
336out_unlock:
337 raw_spin_unlock(&desc->lock);
338}
339EXPORT_SYMBOL_GPL(handle_simple_irq);
340
341/*
342 * Called unconditionally from handle_level_irq() and only for oneshot
343 * interrupts from handle_fasteoi_irq()
344 */
345static void cond_unmask_irq(struct irq_desc *desc)
346{
347 /*
348 * We need to unmask in the following cases:
349 * - Standard level irq (IRQF_ONESHOT is not set)
350 * - Oneshot irq which did not wake the thread (caused by a
351 * spurious interrupt or a primary handler handling it
352 * completely).
353 */
354 if (!irqd_irq_disabled(&desc->irq_data) &&
355 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
356 unmask_irq(desc);
357}
358
359/**
360 * handle_level_irq - Level type irq handler
361 * @irq: the interrupt number
362 * @desc: the interrupt description structure for this irq
363 *
364 * Level type interrupts are active as long as the hardware line has
365 * the active level. This may require to mask the interrupt and unmask
366 * it after the associated handler has acknowledged the device, so the
367 * interrupt line is back to inactive.
368 */
369void
370handle_level_irq(unsigned int irq, struct irq_desc *desc)
371{
372 raw_spin_lock(&desc->lock);
373 mask_ack_irq(desc);
374
375 if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
376 if (!irq_check_poll(desc))
377 goto out_unlock;
378
379 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
380 kstat_incr_irqs_this_cpu(irq, desc);
381
382 /*
383 * If its disabled or no action available
384 * keep it masked and get out of here
385 */
386 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
387 desc->istate |= IRQS_PENDING;
388 goto out_unlock;
389 }
390
391 handle_irq_event(desc);
392
393 cond_unmask_irq(desc);
394
395out_unlock:
396 raw_spin_unlock(&desc->lock);
397}
398EXPORT_SYMBOL_GPL(handle_level_irq);
399
400#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
401static inline void preflow_handler(struct irq_desc *desc)
402{
403 if (desc->preflow_handler)
404 desc->preflow_handler(&desc->irq_data);
405}
406#else
407static inline void preflow_handler(struct irq_desc *desc) { }
408#endif
409
410/**
411 * handle_fasteoi_irq - irq handler for transparent controllers
412 * @irq: the interrupt number
413 * @desc: the interrupt description structure for this irq
414 *
415 * Only a single callback will be issued to the chip: an ->eoi()
416 * call when the interrupt has been serviced. This enables support
417 * for modern forms of interrupt handlers, which handle the flow
418 * details in hardware, transparently.
419 */
420void
421handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
422{
423 raw_spin_lock(&desc->lock);
424
425 if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
426 if (!irq_check_poll(desc))
427 goto out;
428
429 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
430 kstat_incr_irqs_this_cpu(irq, desc);
431
432 /*
433 * If its disabled or no action available
434 * then mask it and get out of here:
435 */
436 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
437 desc->istate |= IRQS_PENDING;
438 mask_irq(desc);
439 goto out;
440 }
441
442 if (desc->istate & IRQS_ONESHOT)
443 mask_irq(desc);
444
445 preflow_handler(desc);
446 handle_irq_event(desc);
447
448 if (desc->istate & IRQS_ONESHOT)
449 cond_unmask_irq(desc);
450
451out_eoi:
452 desc->irq_data.chip->irq_eoi(&desc->irq_data);
453out_unlock:
454 raw_spin_unlock(&desc->lock);
455 return;
456out:
457 if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
458 goto out_eoi;
459 goto out_unlock;
460}
461
462/**
463 * handle_edge_irq - edge type IRQ handler
464 * @irq: the interrupt number
465 * @desc: the interrupt description structure for this irq
466 *
467 * Interrupt occures on the falling and/or rising edge of a hardware
468 * signal. The occurrence is latched into the irq controller hardware
469 * and must be acked in order to be reenabled. After the ack another
470 * interrupt can happen on the same source even before the first one
471 * is handled by the associated event handler. If this happens it
472 * might be necessary to disable (mask) the interrupt depending on the
473 * controller hardware. This requires to reenable the interrupt inside
474 * of the loop which handles the interrupts which have arrived while
475 * the handler was running. If all pending interrupts are handled, the
476 * loop is left.
477 */
478void
479handle_edge_irq(unsigned int irq, struct irq_desc *desc)
480{
481 raw_spin_lock(&desc->lock);
482
483 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
484 /*
485 * If we're currently running this IRQ, or its disabled,
486 * we shouldn't process the IRQ. Mark it pending, handle
487 * the necessary masking and go out
488 */
489 if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
490 irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
491 if (!irq_check_poll(desc)) {
492 desc->istate |= IRQS_PENDING;
493 mask_ack_irq(desc);
494 goto out_unlock;
495 }
496 }
497 kstat_incr_irqs_this_cpu(irq, desc);
498
499 /* Start handling the irq */
500 desc->irq_data.chip->irq_ack(&desc->irq_data);
501
502 do {
503 if (unlikely(!desc->action)) {
504 mask_irq(desc);
505 goto out_unlock;
506 }
507
508 /*
509 * When another irq arrived while we were handling
510 * one, we could have masked the irq.
511 * Renable it, if it was not disabled in meantime.
512 */
513 if (unlikely(desc->istate & IRQS_PENDING)) {
514 if (!irqd_irq_disabled(&desc->irq_data) &&
515 irqd_irq_masked(&desc->irq_data))
516 unmask_irq(desc);
517 }
518
519 handle_irq_event(desc);
520
521 } while ((desc->istate & IRQS_PENDING) &&
522 !irqd_irq_disabled(&desc->irq_data));
523
524out_unlock:
525 raw_spin_unlock(&desc->lock);
526}
527EXPORT_SYMBOL(handle_edge_irq);
528
529#ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
530/**
531 * handle_edge_eoi_irq - edge eoi type IRQ handler
532 * @irq: the interrupt number
533 * @desc: the interrupt description structure for this irq
534 *
535 * Similar as the above handle_edge_irq, but using eoi and w/o the
536 * mask/unmask logic.
537 */
538void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
539{
540 struct irq_chip *chip = irq_desc_get_chip(desc);
541
542 raw_spin_lock(&desc->lock);
543
544 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
545 /*
546 * If we're currently running this IRQ, or its disabled,
547 * we shouldn't process the IRQ. Mark it pending, handle
548 * the necessary masking and go out
549 */
550 if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
551 irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
552 if (!irq_check_poll(desc)) {
553 desc->istate |= IRQS_PENDING;
554 goto out_eoi;
555 }
556 }
557 kstat_incr_irqs_this_cpu(irq, desc);
558
559 do {
560 if (unlikely(!desc->action))
561 goto out_eoi;
562
563 handle_irq_event(desc);
564
565 } while ((desc->istate & IRQS_PENDING) &&
566 !irqd_irq_disabled(&desc->irq_data));
567
568out_eoi:
569 chip->irq_eoi(&desc->irq_data);
570 raw_spin_unlock(&desc->lock);
571}
572#endif
573
574/**
575 * handle_percpu_irq - Per CPU local irq handler
576 * @irq: the interrupt number
577 * @desc: the interrupt description structure for this irq
578 *
579 * Per CPU interrupts on SMP machines without locking requirements
580 */
581void
582handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
583{
584 struct irq_chip *chip = irq_desc_get_chip(desc);
585
586 kstat_incr_irqs_this_cpu(irq, desc);
587
588 if (chip->irq_ack)
589 chip->irq_ack(&desc->irq_data);
590
591 handle_irq_event_percpu(desc, desc->action);
592
593 if (chip->irq_eoi)
594 chip->irq_eoi(&desc->irq_data);
595}
596
597/**
598 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
599 * @irq: the interrupt number
600 * @desc: the interrupt description structure for this irq
601 *
602 * Per CPU interrupts on SMP machines without locking requirements. Same as
603 * handle_percpu_irq() above but with the following extras:
604 *
605 * action->percpu_dev_id is a pointer to percpu variables which
606 * contain the real device id for the cpu on which this handler is
607 * called
608 */
609void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
610{
611 struct irq_chip *chip = irq_desc_get_chip(desc);
612 struct irqaction *action = desc->action;
613 void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
614 irqreturn_t res;
615
616 kstat_incr_irqs_this_cpu(irq, desc);
617
618 if (chip->irq_ack)
619 chip->irq_ack(&desc->irq_data);
620
621 trace_irq_handler_entry(irq, action);
622 res = action->handler(irq, dev_id);
623 trace_irq_handler_exit(irq, action, res);
624
625 if (chip->irq_eoi)
626 chip->irq_eoi(&desc->irq_data);
627}
628
629void
630__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
631 const char *name)
632{
633 unsigned long flags;
634 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
635
636 if (!desc)
637 return;
638
639 if (!handle) {
640 handle = handle_bad_irq;
641 } else {
642 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
643 goto out;
644 }
645
646 /* Uninstall? */
647 if (handle == handle_bad_irq) {
648 if (desc->irq_data.chip != &no_irq_chip)
649 mask_ack_irq(desc);
650 irq_state_set_disabled(desc);
651 desc->depth = 1;
652 }
653 desc->handle_irq = handle;
654 desc->name = name;
655
656 if (handle != handle_bad_irq && is_chained) {
657 irq_settings_set_noprobe(desc);
658 irq_settings_set_norequest(desc);
659 irq_settings_set_nothread(desc);
660 irq_startup(desc, true);
661 }
662out:
663 irq_put_desc_busunlock(desc, flags);
664}
665EXPORT_SYMBOL_GPL(__irq_set_handler);
666
667void
668irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
669 irq_flow_handler_t handle, const char *name)
670{
671 irq_set_chip(irq, chip);
672 __irq_set_handler(irq, handle, 0, name);
673}
674
675void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
676{
677 unsigned long flags;
678 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
679
680 if (!desc)
681 return;
682 irq_settings_clr_and_set(desc, clr, set);
683
684 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
685 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
686 if (irq_settings_has_no_balance_set(desc))
687 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
688 if (irq_settings_is_per_cpu(desc))
689 irqd_set(&desc->irq_data, IRQD_PER_CPU);
690 if (irq_settings_can_move_pcntxt(desc))
691 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
692 if (irq_settings_is_level(desc))
693 irqd_set(&desc->irq_data, IRQD_LEVEL);
694
695 irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
696
697 irq_put_desc_unlock(desc, flags);
698}
699EXPORT_SYMBOL_GPL(irq_modify_status);
700
701/**
702 * irq_cpu_online - Invoke all irq_cpu_online functions.
703 *
704 * Iterate through all irqs and invoke the chip.irq_cpu_online()
705 * for each.
706 */
707void irq_cpu_online(void)
708{
709 struct irq_desc *desc;
710 struct irq_chip *chip;
711 unsigned long flags;
712 unsigned int irq;
713
714 for_each_active_irq(irq) {
715 desc = irq_to_desc(irq);
716 if (!desc)
717 continue;
718
719 raw_spin_lock_irqsave(&desc->lock, flags);
720
721 chip = irq_data_get_irq_chip(&desc->irq_data);
722 if (chip && chip->irq_cpu_online &&
723 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
724 !irqd_irq_disabled(&desc->irq_data)))
725 chip->irq_cpu_online(&desc->irq_data);
726
727 raw_spin_unlock_irqrestore(&desc->lock, flags);
728 }
729}
730
731/**
732 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
733 *
734 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
735 * for each.
736 */
737void irq_cpu_offline(void)
738{
739 struct irq_desc *desc;
740 struct irq_chip *chip;
741 unsigned long flags;
742 unsigned int irq;
743
744 for_each_active_irq(irq) {
745 desc = irq_to_desc(irq);
746 if (!desc)
747 continue;
748
749 raw_spin_lock_irqsave(&desc->lock, flags);
750
751 chip = irq_data_get_irq_chip(&desc->irq_data);
752 if (chip && chip->irq_cpu_offline &&
753 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
754 !irqd_irq_disabled(&desc->irq_data)))
755 chip->irq_cpu_offline(&desc->irq_data);
756
757 raw_spin_unlock_irqrestore(&desc->lock, flags);
758 }
759}