2 * linux/kernel/irq/chip.c
4 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
5 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
7 * This file contains the core interrupt handling code, for irq-chip
10 * Detailed information is available in Documentation/DocBook/genericirq
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>
19 #include <trace/events/irq.h>
21 #include "internals.h"
24 * irq_set_chip - set the irq chip for an irq
26 * @chip: pointer to irq chip description structure
28 int irq_set_chip(unsigned int irq, struct irq_chip *chip)
31 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
39 desc->irq_data.chip = chip;
40 irq_put_desc_unlock(desc, flags);
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.
49 EXPORT_SYMBOL(irq_set_chip);
52 * irq_set_type - set the irq trigger type for an irq
54 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
56 int irq_set_irq_type(unsigned int irq, unsigned int type)
59 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
65 type &= IRQ_TYPE_SENSE_MASK;
66 ret = __irq_set_trigger(desc, irq, type);
67 irq_put_desc_busunlock(desc, flags);
70 EXPORT_SYMBOL(irq_set_irq_type);
73 * irq_set_handler_data - set irq handler data for an irq
74 * @irq: Interrupt number
75 * @data: Pointer to interrupt specific data
77 * Set the hardware irq controller data for an irq
79 int irq_set_handler_data(unsigned int irq, void *data)
82 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
86 desc->irq_data.handler_data = data;
87 irq_put_desc_unlock(desc, flags);
90 EXPORT_SYMBOL(irq_set_handler_data);
94 * irq_set_msi_desc - set MSI descriptor data for an irq
95 * @irq: Interrupt number
96 * @entry: Pointer to MSI descriptor data
98 * Set the MSI descriptor entry for an irq
100 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
103 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
107 desc->irq_data.msi_desc = entry;
110 irq_put_desc_unlock(desc, flags);
116 * irq_set_chip_data - set irq chip data for an irq
117 * @irq: Interrupt number
118 * @data: Pointer to chip specific data
120 * Set the hardware irq chip data for an irq
122 int irq_set_chip_data(unsigned int irq, void *data)
125 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
129 desc->irq_data.chip_data = data;
130 irq_put_desc_unlock(desc, flags);
133 EXPORT_SYMBOL(irq_set_chip_data);
135 struct irq_data *irq_get_irq_data(unsigned int irq)
137 struct irq_desc *desc = irq_to_desc(irq);
139 return desc ? &desc->irq_data : NULL;
141 EXPORT_SYMBOL_GPL(irq_get_irq_data);
143 static void irq_state_clr_disabled(struct irq_desc *desc)
145 irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
148 static void irq_state_set_disabled(struct irq_desc *desc)
150 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
153 static void irq_state_clr_masked(struct irq_desc *desc)
155 irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
158 static void irq_state_set_masked(struct irq_desc *desc)
160 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
163 int irq_startup(struct irq_desc *desc, bool resend)
167 irq_state_clr_disabled(desc);
170 if (desc->irq_data.chip->irq_startup) {
171 ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
172 irq_state_clr_masked(desc);
177 check_irq_resend(desc, desc->irq_data.irq);
181 void irq_shutdown(struct irq_desc *desc)
183 irq_state_set_disabled(desc);
185 if (desc->irq_data.chip->irq_shutdown)
186 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
187 else if (desc->irq_data.chip->irq_disable)
188 desc->irq_data.chip->irq_disable(&desc->irq_data);
190 desc->irq_data.chip->irq_mask(&desc->irq_data);
191 irq_state_set_masked(desc);
194 void irq_enable(struct irq_desc *desc)
196 irq_state_clr_disabled(desc);
197 if (desc->irq_data.chip->irq_enable)
198 desc->irq_data.chip->irq_enable(&desc->irq_data);
200 desc->irq_data.chip->irq_unmask(&desc->irq_data);
201 irq_state_clr_masked(desc);
204 void irq_disable(struct irq_desc *desc)
206 irq_state_set_disabled(desc);
207 if (desc->irq_data.chip->irq_disable) {
208 desc->irq_data.chip->irq_disable(&desc->irq_data);
209 irq_state_set_masked(desc);
213 void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu)
215 if (desc->irq_data.chip->irq_enable)
216 desc->irq_data.chip->irq_enable(&desc->irq_data);
218 desc->irq_data.chip->irq_unmask(&desc->irq_data);
219 cpumask_set_cpu(cpu, desc->percpu_enabled);
222 void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
224 if (desc->irq_data.chip->irq_disable)
225 desc->irq_data.chip->irq_disable(&desc->irq_data);
227 desc->irq_data.chip->irq_mask(&desc->irq_data);
228 cpumask_clear_cpu(cpu, desc->percpu_enabled);
231 static inline void mask_ack_irq(struct irq_desc *desc)
233 if (desc->irq_data.chip->irq_mask_ack)
234 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
236 desc->irq_data.chip->irq_mask(&desc->irq_data);
237 if (desc->irq_data.chip->irq_ack)
238 desc->irq_data.chip->irq_ack(&desc->irq_data);
240 irq_state_set_masked(desc);
243 void mask_irq(struct irq_desc *desc)
245 if (desc->irq_data.chip->irq_mask) {
246 desc->irq_data.chip->irq_mask(&desc->irq_data);
247 irq_state_set_masked(desc);
251 void unmask_irq(struct irq_desc *desc)
253 if (desc->irq_data.chip->irq_unmask) {
254 desc->irq_data.chip->irq_unmask(&desc->irq_data);
255 irq_state_clr_masked(desc);
260 * handle_nested_irq - Handle a nested irq from a irq thread
261 * @irq: the interrupt number
263 * Handle interrupts which are nested into a threaded interrupt
264 * handler. The handler function is called inside the calling
267 void handle_nested_irq(unsigned int irq)
269 struct irq_desc *desc = irq_to_desc(irq);
270 struct irqaction *action;
271 irqreturn_t action_ret;
275 raw_spin_lock_irq(&desc->lock);
277 kstat_incr_irqs_this_cpu(irq, desc);
279 action = desc->action;
280 if (unlikely(!action || irqd_irq_disabled(&desc->irq_data)))
283 irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
284 raw_spin_unlock_irq(&desc->lock);
286 action_ret = action->thread_fn(action->irq, action->dev_id);
288 note_interrupt(irq, desc, action_ret);
290 raw_spin_lock_irq(&desc->lock);
291 irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
294 raw_spin_unlock_irq(&desc->lock);
296 EXPORT_SYMBOL_GPL(handle_nested_irq);
298 static bool irq_check_poll(struct irq_desc *desc)
300 if (!(desc->istate & IRQS_POLL_INPROGRESS))
302 return irq_wait_for_poll(desc);
306 * handle_simple_irq - Simple and software-decoded IRQs.
307 * @irq: the interrupt number
308 * @desc: the interrupt description structure for this irq
310 * Simple interrupts are either sent from a demultiplexing interrupt
311 * handler or come from hardware, where no interrupt hardware control
314 * Note: The caller is expected to handle the ack, clear, mask and
315 * unmask issues if necessary.
318 handle_simple_irq(unsigned int irq, struct irq_desc *desc)
320 raw_spin_lock(&desc->lock);
322 if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
323 if (!irq_check_poll(desc))
326 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
327 kstat_incr_irqs_this_cpu(irq, desc);
329 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
332 handle_irq_event(desc);
335 raw_spin_unlock(&desc->lock);
337 EXPORT_SYMBOL_GPL(handle_simple_irq);
340 * Called unconditionally from handle_level_irq() and only for oneshot
341 * interrupts from handle_fasteoi_irq()
343 static void cond_unmask_irq(struct irq_desc *desc)
346 * We need to unmask in the following cases:
347 * - Standard level irq (IRQF_ONESHOT is not set)
348 * - Oneshot irq which did not wake the thread (caused by a
349 * spurious interrupt or a primary handler handling it
352 if (!irqd_irq_disabled(&desc->irq_data) &&
353 irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
358 * handle_level_irq - Level type irq handler
359 * @irq: the interrupt number
360 * @desc: the interrupt description structure for this irq
362 * Level type interrupts are active as long as the hardware line has
363 * the active level. This may require to mask the interrupt and unmask
364 * it after the associated handler has acknowledged the device, so the
365 * interrupt line is back to inactive.
368 handle_level_irq(unsigned int irq, struct irq_desc *desc)
370 raw_spin_lock(&desc->lock);
373 if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
374 if (!irq_check_poll(desc))
377 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
378 kstat_incr_irqs_this_cpu(irq, desc);
381 * If its disabled or no action available
382 * keep it masked and get out of here
384 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
387 handle_irq_event(desc);
389 cond_unmask_irq(desc);
392 raw_spin_unlock(&desc->lock);
394 EXPORT_SYMBOL_GPL(handle_level_irq);
396 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
397 static inline void preflow_handler(struct irq_desc *desc)
399 if (desc->preflow_handler)
400 desc->preflow_handler(&desc->irq_data);
403 static inline void preflow_handler(struct irq_desc *desc) { }
407 * handle_fasteoi_irq - irq handler for transparent controllers
408 * @irq: the interrupt number
409 * @desc: the interrupt description structure for this irq
411 * Only a single callback will be issued to the chip: an ->eoi()
412 * call when the interrupt has been serviced. This enables support
413 * for modern forms of interrupt handlers, which handle the flow
414 * details in hardware, transparently.
417 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
419 raw_spin_lock(&desc->lock);
421 if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
422 if (!irq_check_poll(desc))
425 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
426 kstat_incr_irqs_this_cpu(irq, desc);
429 * If its disabled or no action available
430 * then mask it and get out of here:
432 if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
433 desc->istate |= IRQS_PENDING;
438 if (desc->istate & IRQS_ONESHOT)
441 preflow_handler(desc);
442 handle_irq_event(desc);
444 if (desc->istate & IRQS_ONESHOT)
445 cond_unmask_irq(desc);
448 desc->irq_data.chip->irq_eoi(&desc->irq_data);
450 raw_spin_unlock(&desc->lock);
453 if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
459 * handle_edge_irq - edge type IRQ handler
460 * @irq: the interrupt number
461 * @desc: the interrupt description structure for this irq
463 * Interrupt occures on the falling and/or rising edge of a hardware
464 * signal. The occurrence is latched into the irq controller hardware
465 * and must be acked in order to be reenabled. After the ack another
466 * interrupt can happen on the same source even before the first one
467 * is handled by the associated event handler. If this happens it
468 * might be necessary to disable (mask) the interrupt depending on the
469 * controller hardware. This requires to reenable the interrupt inside
470 * of the loop which handles the interrupts which have arrived while
471 * the handler was running. If all pending interrupts are handled, the
475 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
477 raw_spin_lock(&desc->lock);
479 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
481 * If we're currently running this IRQ, or its disabled,
482 * we shouldn't process the IRQ. Mark it pending, handle
483 * the necessary masking and go out
485 if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
486 irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
487 if (!irq_check_poll(desc)) {
488 desc->istate |= IRQS_PENDING;
493 kstat_incr_irqs_this_cpu(irq, desc);
495 /* Start handling the irq */
496 desc->irq_data.chip->irq_ack(&desc->irq_data);
499 if (unlikely(!desc->action)) {
505 * When another irq arrived while we were handling
506 * one, we could have masked the irq.
507 * Renable it, if it was not disabled in meantime.
509 if (unlikely(desc->istate & IRQS_PENDING)) {
510 if (!irqd_irq_disabled(&desc->irq_data) &&
511 irqd_irq_masked(&desc->irq_data))
515 handle_irq_event(desc);
517 } while ((desc->istate & IRQS_PENDING) &&
518 !irqd_irq_disabled(&desc->irq_data));
521 raw_spin_unlock(&desc->lock);
523 EXPORT_SYMBOL(handle_edge_irq);
525 #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
527 * handle_edge_eoi_irq - edge eoi type IRQ handler
528 * @irq: the interrupt number
529 * @desc: the interrupt description structure for this irq
531 * Similar as the above handle_edge_irq, but using eoi and w/o the
534 void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
536 struct irq_chip *chip = irq_desc_get_chip(desc);
538 raw_spin_lock(&desc->lock);
540 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
542 * If we're currently running this IRQ, or its disabled,
543 * we shouldn't process the IRQ. Mark it pending, handle
544 * the necessary masking and go out
546 if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
547 irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
548 if (!irq_check_poll(desc)) {
549 desc->istate |= IRQS_PENDING;
553 kstat_incr_irqs_this_cpu(irq, desc);
556 if (unlikely(!desc->action))
559 handle_irq_event(desc);
561 } while ((desc->istate & IRQS_PENDING) &&
562 !irqd_irq_disabled(&desc->irq_data));
565 chip->irq_eoi(&desc->irq_data);
566 raw_spin_unlock(&desc->lock);
571 * handle_percpu_irq - Per CPU local irq handler
572 * @irq: the interrupt number
573 * @desc: the interrupt description structure for this irq
575 * Per CPU interrupts on SMP machines without locking requirements
578 handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
580 struct irq_chip *chip = irq_desc_get_chip(desc);
582 kstat_incr_irqs_this_cpu(irq, desc);
585 chip->irq_ack(&desc->irq_data);
587 handle_irq_event_percpu(desc, desc->action);
590 chip->irq_eoi(&desc->irq_data);
594 * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
595 * @irq: the interrupt number
596 * @desc: the interrupt description structure for this irq
598 * Per CPU interrupts on SMP machines without locking requirements. Same as
599 * handle_percpu_irq() above but with the following extras:
601 * action->percpu_dev_id is a pointer to percpu variables which
602 * contain the real device id for the cpu on which this handler is
605 void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc)
607 struct irq_chip *chip = irq_desc_get_chip(desc);
608 struct irqaction *action = desc->action;
609 void *dev_id = __this_cpu_ptr(action->percpu_dev_id);
612 kstat_incr_irqs_this_cpu(irq, desc);
615 chip->irq_ack(&desc->irq_data);
617 trace_irq_handler_entry(irq, action);
618 res = action->handler(irq, dev_id);
619 trace_irq_handler_exit(irq, action, res);
622 chip->irq_eoi(&desc->irq_data);
626 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
630 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, 0);
636 handle = handle_bad_irq;
638 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
643 if (handle == handle_bad_irq) {
644 if (desc->irq_data.chip != &no_irq_chip)
646 irq_state_set_disabled(desc);
649 desc->handle_irq = handle;
652 if (handle != handle_bad_irq && is_chained) {
653 irq_settings_set_noprobe(desc);
654 irq_settings_set_norequest(desc);
655 irq_settings_set_nothread(desc);
656 irq_startup(desc, true);
659 irq_put_desc_busunlock(desc, flags);
661 EXPORT_SYMBOL_GPL(__irq_set_handler);
664 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
665 irq_flow_handler_t handle, const char *name)
667 irq_set_chip(irq, chip);
668 __irq_set_handler(irq, handle, 0, name);
671 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
674 struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
678 irq_settings_clr_and_set(desc, clr, set);
680 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
681 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
682 if (irq_settings_has_no_balance_set(desc))
683 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
684 if (irq_settings_is_per_cpu(desc))
685 irqd_set(&desc->irq_data, IRQD_PER_CPU);
686 if (irq_settings_can_move_pcntxt(desc))
687 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
688 if (irq_settings_is_level(desc))
689 irqd_set(&desc->irq_data, IRQD_LEVEL);
691 irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
693 irq_put_desc_unlock(desc, flags);
695 EXPORT_SYMBOL_GPL(irq_modify_status);
698 * irq_cpu_online - Invoke all irq_cpu_online functions.
700 * Iterate through all irqs and invoke the chip.irq_cpu_online()
703 void irq_cpu_online(void)
705 struct irq_desc *desc;
706 struct irq_chip *chip;
710 for_each_active_irq(irq) {
711 desc = irq_to_desc(irq);
715 raw_spin_lock_irqsave(&desc->lock, flags);
717 chip = irq_data_get_irq_chip(&desc->irq_data);
718 if (chip && chip->irq_cpu_online &&
719 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
720 !irqd_irq_disabled(&desc->irq_data)))
721 chip->irq_cpu_online(&desc->irq_data);
723 raw_spin_unlock_irqrestore(&desc->lock, flags);
728 * irq_cpu_offline - Invoke all irq_cpu_offline functions.
730 * Iterate through all irqs and invoke the chip.irq_cpu_offline()
733 void irq_cpu_offline(void)
735 struct irq_desc *desc;
736 struct irq_chip *chip;
740 for_each_active_irq(irq) {
741 desc = irq_to_desc(irq);
745 raw_spin_lock_irqsave(&desc->lock, flags);
747 chip = irq_data_get_irq_chip(&desc->irq_data);
748 if (chip && chip->irq_cpu_offline &&
749 (!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
750 !irqd_irq_disabled(&desc->irq_data)))
751 chip->irq_cpu_offline(&desc->irq_data);
753 raw_spin_unlock_irqrestore(&desc->lock, flags);