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