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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 "internals.h"
20
21/**
22 * irq_set_chip - set the irq chip for an irq
23 * @irq: irq number
24 * @chip: pointer to irq chip description structure
25 */
26int irq_set_chip(unsigned int irq, struct irq_chip *chip)
27{
28 unsigned long flags;
29 struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
30
31 if (!desc)
32 return -EINVAL;
33
34 if (!chip)
35 chip = &no_irq_chip;
36
37 desc->irq_data.chip = chip;
38 irq_put_desc_unlock(desc, flags);
39 /*
40 * For !CONFIG_SPARSE_IRQ make the irq show up in
41 * allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
42 * already marked, and this call is harmless.
43 */
44 irq_reserve_irq(irq);
45 return 0;
46}
47EXPORT_SYMBOL(irq_set_chip);
48
49/**
50 * irq_set_type - set the irq trigger type for an irq
51 * @irq: irq number
52 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
53 */
54int irq_set_irq_type(unsigned int irq, unsigned int type)
55{
56 unsigned long flags;
57 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
58 int ret = 0;
59
60 if (!desc)
61 return -EINVAL;
62
63 type &= IRQ_TYPE_SENSE_MASK;
64 if (type != IRQ_TYPE_NONE)
65 ret = __irq_set_trigger(desc, irq, type);
66 irq_put_desc_busunlock(desc, flags);
67 return ret;
68}
69EXPORT_SYMBOL(irq_set_irq_type);
70
71/**
72 * irq_set_handler_data - set irq handler data for an irq
73 * @irq: Interrupt number
74 * @data: Pointer to interrupt specific data
75 *
76 * Set the hardware irq controller data for an irq
77 */
78int irq_set_handler_data(unsigned int irq, void *data)
79{
80 unsigned long flags;
81 struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
82
83 if (!desc)
84 return -EINVAL;
85 desc->irq_data.handler_data = data;
86 irq_put_desc_unlock(desc, flags);
87 return 0;
88}
89EXPORT_SYMBOL(irq_set_handler_data);
90
91/**
92 * irq_set_msi_desc - set MSI descriptor data for an irq
93 * @irq: Interrupt number
94 * @entry: Pointer to MSI descriptor data
95 *
96 * Set the MSI descriptor entry for an irq
97 */
98int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
99{
100 unsigned long flags;
101 struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
102
103 if (!desc)
104 return -EINVAL;
105 desc->irq_data.msi_desc = entry;
106 if (entry)
107 entry->irq = irq;
108 irq_put_desc_unlock(desc, flags);
109 return 0;
110}
111
112/**
113 * irq_set_chip_data - set irq chip data for an irq
114 * @irq: Interrupt number
115 * @data: Pointer to chip specific data
116 *
117 * Set the hardware irq chip data for an irq
118 */
119int irq_set_chip_data(unsigned int irq, void *data)
120{
121 unsigned long flags;
122 struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
123
124 if (!desc)
125 return -EINVAL;
126 desc->irq_data.chip_data = data;
127 irq_put_desc_unlock(desc, flags);
128 return 0;
129}
130EXPORT_SYMBOL(irq_set_chip_data);
131
132struct irq_data *irq_get_irq_data(unsigned int irq)
133{
134 struct irq_desc *desc = irq_to_desc(irq);
135
136 return desc ? &desc->irq_data : NULL;
137}
138EXPORT_SYMBOL_GPL(irq_get_irq_data);
139
140static void irq_state_clr_disabled(struct irq_desc *desc)
141{
142 irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
143}
144
145static void irq_state_set_disabled(struct irq_desc *desc)
146{
147 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
148}
149
150static void irq_state_clr_masked(struct irq_desc *desc)
151{
152 irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
153}
154
155static void irq_state_set_masked(struct irq_desc *desc)
156{
157 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
158}
159
160int irq_startup(struct irq_desc *desc)
161{
162 irq_state_clr_disabled(desc);
163 desc->depth = 0;
164
165 if (desc->irq_data.chip->irq_startup) {
166 int ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
167 irq_state_clr_masked(desc);
168 return ret;
169 }
170
171 irq_enable(desc);
172 return 0;
173}
174
175void irq_shutdown(struct irq_desc *desc)
176{
177 irq_state_set_disabled(desc);
178 desc->depth = 1;
179 if (desc->irq_data.chip->irq_shutdown)
180 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
181 else if (desc->irq_data.chip->irq_disable)
182 desc->irq_data.chip->irq_disable(&desc->irq_data);
183 else
184 desc->irq_data.chip->irq_mask(&desc->irq_data);
185 irq_state_set_masked(desc);
186}
187
188void irq_enable(struct irq_desc *desc)
189{
190 irq_state_clr_disabled(desc);
191 if (desc->irq_data.chip->irq_enable)
192 desc->irq_data.chip->irq_enable(&desc->irq_data);
193 else
194 desc->irq_data.chip->irq_unmask(&desc->irq_data);
195 irq_state_clr_masked(desc);
196}
197
198void irq_disable(struct irq_desc *desc)
199{
200 irq_state_set_disabled(desc);
201 if (desc->irq_data.chip->irq_disable) {
202 desc->irq_data.chip->irq_disable(&desc->irq_data);
203 irq_state_set_masked(desc);
204 }
205}
206
207static inline void mask_ack_irq(struct irq_desc *desc)
208{
209 if (desc->irq_data.chip->irq_mask_ack)
210 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
211 else {
212 desc->irq_data.chip->irq_mask(&desc->irq_data);
213 if (desc->irq_data.chip->irq_ack)
214 desc->irq_data.chip->irq_ack(&desc->irq_data);
215 }
216 irq_state_set_masked(desc);
217}
218
219void mask_irq(struct irq_desc *desc)
220{
221 if (desc->irq_data.chip->irq_mask) {
222 desc->irq_data.chip->irq_mask(&desc->irq_data);
223 irq_state_set_masked(desc);
224 }
225}
226
227void unmask_irq(struct irq_desc *desc)
228{
229 if (desc->irq_data.chip->irq_unmask) {
230 desc->irq_data.chip->irq_unmask(&desc->irq_data);
231 irq_state_clr_masked(desc);
232 }
233}
234
235/*
236 * handle_nested_irq - Handle a nested irq from a irq thread
237 * @irq: the interrupt number
238 *
239 * Handle interrupts which are nested into a threaded interrupt
240 * handler. The handler function is called inside the calling
241 * threads context.
242 */
243void handle_nested_irq(unsigned int irq)
244{
245 struct irq_desc *desc = irq_to_desc(irq);
246 struct irqaction *action;
247 irqreturn_t action_ret;
248
249 might_sleep();
250
251 raw_spin_lock_irq(&desc->lock);
252
253 kstat_incr_irqs_this_cpu(irq, desc);
254
255 action = desc->action;
256 if (unlikely(!action || irqd_irq_disabled(&desc->irq_data)))
257 goto out_unlock;
258
259 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
260 raw_spin_unlock_irq(&desc->lock);
261
262 action_ret = action->thread_fn(action->irq, action->dev_id);
263 if (!noirqdebug)
264 note_interrupt(irq, desc, action_ret);
265
266 raw_spin_lock_irq(&desc->lock);
267 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
268
269out_unlock:
270 raw_spin_unlock_irq(&desc->lock);
271}
272EXPORT_SYMBOL_GPL(handle_nested_irq);
273
274static bool irq_check_poll(struct irq_desc *desc)
275{
276 if (!(desc->istate & IRQS_POLL_INPROGRESS))
277 return false;
278 return irq_wait_for_poll(desc);
279}
280
281/**
282 * handle_simple_irq - Simple and software-decoded IRQs.
283 * @irq: the interrupt number
284 * @desc: the interrupt description structure for this irq
285 *
286 * Simple interrupts are either sent from a demultiplexing interrupt
287 * handler or come from hardware, where no interrupt hardware control
288 * is necessary.
289 *
290 * Note: The caller is expected to handle the ack, clear, mask and
291 * unmask issues if necessary.
292 */
293void
294handle_simple_irq(unsigned int irq, struct irq_desc *desc)
295{
296 raw_spin_lock(&desc->lock);
297
298 if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
299 if (!irq_check_poll(desc))
300 goto out_unlock;
301
302 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
303 kstat_incr_irqs_this_cpu(irq, desc);
304
305 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
306 goto out_unlock;
307
308 handle_irq_event(desc);
309
310out_unlock:
311 raw_spin_unlock(&desc->lock);
312}
313EXPORT_SYMBOL_GPL(handle_simple_irq);
314
315/**
316 * handle_level_irq - Level type irq handler
317 * @irq: the interrupt number
318 * @desc: the interrupt description structure for this irq
319 *
320 * Level type interrupts are active as long as the hardware line has
321 * the active level. This may require to mask the interrupt and unmask
322 * it after the associated handler has acknowledged the device, so the
323 * interrupt line is back to inactive.
324 */
325void
326handle_level_irq(unsigned int irq, struct irq_desc *desc)
327{
328 raw_spin_lock(&desc->lock);
329 mask_ack_irq(desc);
330
331 if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
332 if (!irq_check_poll(desc))
333 goto out_unlock;
334
335 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
336 kstat_incr_irqs_this_cpu(irq, desc);
337
338 /*
339 * If its disabled or no action available
340 * keep it masked and get out of here
341 */
342 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
343 goto out_unlock;
344
345 handle_irq_event(desc);
346
347 if (!irqd_irq_disabled(&desc->irq_data) && !(desc->istate & IRQS_ONESHOT))
348 unmask_irq(desc);
349out_unlock:
350 raw_spin_unlock(&desc->lock);
351}
352EXPORT_SYMBOL_GPL(handle_level_irq);
353
354#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
355static inline void preflow_handler(struct irq_desc *desc)
356{
357 if (desc->preflow_handler)
358 desc->preflow_handler(&desc->irq_data);
359}
360#else
361static inline void preflow_handler(struct irq_desc *desc) { }
362#endif
363
364/**
365 * handle_fasteoi_irq - irq handler for transparent controllers
366 * @irq: the interrupt number
367 * @desc: the interrupt description structure for this irq
368 *
369 * Only a single callback will be issued to the chip: an ->eoi()
370 * call when the interrupt has been serviced. This enables support
371 * for modern forms of interrupt handlers, which handle the flow
372 * details in hardware, transparently.
373 */
374void
375handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
376{
377 raw_spin_lock(&desc->lock);
378
379 if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
380 if (!irq_check_poll(desc))
381 goto out;
382
383 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
384 kstat_incr_irqs_this_cpu(irq, desc);
385
386 /*
387 * If its disabled or no action available
388 * then mask it and get out of here:
389 */
390 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
391 desc->istate |= IRQS_PENDING;
392 mask_irq(desc);
393 goto out;
394 }
395
396 if (desc->istate & IRQS_ONESHOT)
397 mask_irq(desc);
398
399 preflow_handler(desc);
400 handle_irq_event(desc);
401
402out_eoi:
403 desc->irq_data.chip->irq_eoi(&desc->irq_data);
404out_unlock:
405 raw_spin_unlock(&desc->lock);
406 return;
407out:
408 if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
409 goto out_eoi;
410 goto out_unlock;
411}
412
413/**
414 * handle_edge_irq - edge type IRQ handler
415 * @irq: the interrupt number
416 * @desc: the interrupt description structure for this irq
417 *
418 * Interrupt occures on the falling and/or rising edge of a hardware
419 * signal. The occurrence is latched into the irq controller hardware
420 * and must be acked in order to be reenabled. After the ack another
421 * interrupt can happen on the same source even before the first one
422 * is handled by the associated event handler. If this happens it
423 * might be necessary to disable (mask) the interrupt depending on the
424 * controller hardware. This requires to reenable the interrupt inside
425 * of the loop which handles the interrupts which have arrived while
426 * the handler was running. If all pending interrupts are handled, the
427 * loop is left.
428 */
429void
430handle_edge_irq(unsigned int irq, struct irq_desc *desc)
431{
432 raw_spin_lock(&desc->lock);
433
434 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
435 /*
436 * If we're currently running this IRQ, or its disabled,
437 * we shouldn't process the IRQ. Mark it pending, handle
438 * the necessary masking and go out
439 */
440 if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
441 irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
442 if (!irq_check_poll(desc)) {
443 desc->istate |= IRQS_PENDING;
444 mask_ack_irq(desc);
445 goto out_unlock;
446 }
447 }
448 kstat_incr_irqs_this_cpu(irq, desc);
449
450 /* Start handling the irq */
451 desc->irq_data.chip->irq_ack(&desc->irq_data);
452
453 do {
454 if (unlikely(!desc->action)) {
455 mask_irq(desc);
456 goto out_unlock;
457 }
458
459 /*
460 * When another irq arrived while we were handling
461 * one, we could have masked the irq.
462 * Renable it, if it was not disabled in meantime.
463 */
464 if (unlikely(desc->istate & IRQS_PENDING)) {
465 if (!irqd_irq_disabled(&desc->irq_data) &&
466 irqd_irq_masked(&desc->irq_data))
467 unmask_irq(desc);
468 }
469
470 handle_irq_event(desc);
471
472 } while ((desc->istate & IRQS_PENDING) &&
473 !irqd_irq_disabled(&desc->irq_data));
474
475out_unlock:
476 raw_spin_unlock(&desc->lock);
477}
478
479#ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
480/**
481 * handle_edge_eoi_irq - edge eoi type IRQ handler
482 * @irq: the interrupt number
483 * @desc: the interrupt description structure for this irq
484 *
485 * Similar as the above handle_edge_irq, but using eoi and w/o the
486 * mask/unmask logic.
487 */
488void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
489{
490 struct irq_chip *chip = irq_desc_get_chip(desc);
491
492 raw_spin_lock(&desc->lock);
493
494 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
495 /*
496 * If we're currently running this IRQ, or its disabled,
497 * we shouldn't process the IRQ. Mark it pending, handle
498 * the necessary masking and go out
499 */
500 if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
501 irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
502 if (!irq_check_poll(desc)) {
503 desc->istate |= IRQS_PENDING;
504 goto out_eoi;
505 }
506 }
507 kstat_incr_irqs_this_cpu(irq, desc);
508
509 do {
510 if (unlikely(!desc->action))
511 goto out_eoi;
512
513 handle_irq_event(desc);
514
515 } while ((desc->istate & IRQS_PENDING) &&
516 !irqd_irq_disabled(&desc->irq_data));
517
518out_eoi:
519 chip->irq_eoi(&desc->irq_data);
520 raw_spin_unlock(&desc->lock);
521}
522#endif
523
524/**
525 * handle_percpu_irq - Per CPU local irq handler
526 * @irq: the interrupt number
527 * @desc: the interrupt description structure for this irq
528 *
529 * Per CPU interrupts on SMP machines without locking requirements
530 */
531void
532handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
533{
534 struct irq_chip *chip = irq_desc_get_chip(desc);
535
536 kstat_incr_irqs_this_cpu(irq, desc);
537
538 if (chip->irq_ack)
539 chip->irq_ack(&desc->irq_data);
540
541 handle_irq_event_percpu(desc, desc->action);
542
543 if (chip->irq_eoi)
544 chip->irq_eoi(&desc->irq_data);
545}
546
547void
548__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
549 const char *name)
550{
551 unsigned long flags;
552 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
553
554 if (!desc)
555 return;
556
557 if (!handle) {
558 handle = handle_bad_irq;
559 } else {
560 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
561 goto out;
562 }
563
564 /* Uninstall? */
565 if (handle == handle_bad_irq) {
566 if (desc->irq_data.chip != &no_irq_chip)
567 mask_ack_irq(desc);
568 irq_state_set_disabled(desc);
569 desc->depth = 1;
570 }
571 desc->handle_irq = handle;
572 desc->name = name;
573
574 if (handle != handle_bad_irq && is_chained) {
575 irq_settings_set_noprobe(desc);
576 irq_settings_set_norequest(desc);
577 irq_settings_set_nothread(desc);
578 irq_startup(desc);
579 }
580out:
581 irq_put_desc_busunlock(desc, flags);
582}
583EXPORT_SYMBOL_GPL(__irq_set_handler);
584
585void
586irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
587 irq_flow_handler_t handle, const char *name)
588{
589 irq_set_chip(irq, chip);
590 __irq_set_handler(irq, handle, 0, name);
591}
592
593void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
594{
595 unsigned long flags;
596 struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
597
598 if (!desc)
599 return;
600 irq_settings_clr_and_set(desc, clr, set);
601
602 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
603 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
604 if (irq_settings_has_no_balance_set(desc))
605 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
606 if (irq_settings_is_per_cpu(desc))
607 irqd_set(&desc->irq_data, IRQD_PER_CPU);
608 if (irq_settings_can_move_pcntxt(desc))
609 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
610 if (irq_settings_is_level(desc))
611 irqd_set(&desc->irq_data, IRQD_LEVEL);
612
613 irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
614
615 irq_put_desc_unlock(desc, flags);
616}
617EXPORT_SYMBOL_GPL(irq_modify_status);
618
619/**
620 * irq_cpu_online - Invoke all irq_cpu_online functions.
621 *
622 * Iterate through all irqs and invoke the chip.irq_cpu_online()
623 * for each.
624 */
625void irq_cpu_online(void)
626{
627 struct irq_desc *desc;
628 struct irq_chip *chip;
629 unsigned long flags;
630 unsigned int irq;
631
632 for_each_active_irq(irq) {
633 desc = irq_to_desc(irq);
634 if (!desc)
635 continue;
636
637 raw_spin_lock_irqsave(&desc->lock, flags);
638
639 chip = irq_data_get_irq_chip(&desc->irq_data);
640 if (chip && chip->irq_cpu_online &&
641 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
642 !irqd_irq_disabled(&desc->irq_data)))
643 chip->irq_cpu_online(&desc->irq_data);
644
645 raw_spin_unlock_irqrestore(&desc->lock, flags);
646 }
647}
648
649/**
650 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
651 *
652 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
653 * for each.
654 */
655void irq_cpu_offline(void)
656{
657 struct irq_desc *desc;
658 struct irq_chip *chip;
659 unsigned long flags;
660 unsigned int irq;
661
662 for_each_active_irq(irq) {
663 desc = irq_to_desc(irq);
664 if (!desc)
665 continue;
666
667 raw_spin_lock_irqsave(&desc->lock, flags);
668
669 chip = irq_data_get_irq_chip(&desc->irq_data);
670 if (chip && chip->irq_cpu_offline &&
671 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
672 !irqd_irq_disabled(&desc->irq_data)))
673 chip->irq_cpu_offline(&desc->irq_data);
674
675 raw_spin_unlock_irqrestore(&desc->lock, flags);
676 }
677}
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}