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 "internals.h"
22 * irq_set_chip - set the irq chip for an irq
24 * @chip: pointer to irq chip description structure
26 int irq_set_chip(unsigned int irq, struct irq_chip *chip)
29 struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
37 irq_chip_set_defaults(chip);
38 desc->irq_data.chip = chip;
39 irq_put_desc_unlock(desc, flags);
41 * For !CONFIG_SPARSE_IRQ make the irq show up in
42 * allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
43 * already marked, and this call is harmless.
48 EXPORT_SYMBOL(irq_set_chip);
51 * irq_set_type - set the irq trigger type for an irq
53 * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
55 int irq_set_irq_type(unsigned int irq, unsigned int type)
58 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
64 type &= IRQ_TYPE_SENSE_MASK;
65 if (type != IRQ_TYPE_NONE)
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);
86 desc->irq_data.handler_data = data;
87 irq_put_desc_unlock(desc, flags);
90 EXPORT_SYMBOL(irq_set_handler_data);
93 * irq_set_msi_desc - set MSI descriptor data for an irq
94 * @irq: Interrupt number
95 * @entry: Pointer to MSI descriptor data
97 * Set the MSI descriptor entry for an irq
99 int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
102 struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
106 desc->irq_data.msi_desc = entry;
109 irq_put_desc_unlock(desc, flags);
114 * irq_set_chip_data - set irq chip data for an irq
115 * @irq: Interrupt number
116 * @data: Pointer to chip specific data
118 * Set the hardware irq chip data for an irq
120 int irq_set_chip_data(unsigned int irq, void *data)
123 struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
127 desc->irq_data.chip_data = data;
128 irq_put_desc_unlock(desc, flags);
131 EXPORT_SYMBOL(irq_set_chip_data);
133 struct irq_data *irq_get_irq_data(unsigned int irq)
135 struct irq_desc *desc = irq_to_desc(irq);
137 return desc ? &desc->irq_data : NULL;
139 EXPORT_SYMBOL_GPL(irq_get_irq_data);
141 static void irq_state_clr_disabled(struct irq_desc *desc)
143 desc->istate &= ~IRQS_DISABLED;
144 irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
145 irq_compat_clr_disabled(desc);
148 static void irq_state_set_disabled(struct irq_desc *desc)
150 desc->istate |= IRQS_DISABLED;
151 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
152 irq_compat_set_disabled(desc);
155 static void irq_state_clr_masked(struct irq_desc *desc)
157 desc->istate &= ~IRQS_MASKED;
158 irq_compat_clr_masked(desc);
161 static void irq_state_set_masked(struct irq_desc *desc)
163 desc->istate |= IRQS_MASKED;
164 irq_compat_set_masked(desc);
167 int irq_startup(struct irq_desc *desc)
169 irq_state_clr_disabled(desc);
172 if (desc->irq_data.chip->irq_startup) {
173 int ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
174 irq_state_clr_masked(desc);
182 void irq_shutdown(struct irq_desc *desc)
184 irq_state_set_disabled(desc);
186 if (desc->irq_data.chip->irq_shutdown)
187 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
188 if (desc->irq_data.chip->irq_disable)
189 desc->irq_data.chip->irq_disable(&desc->irq_data);
191 desc->irq_data.chip->irq_mask(&desc->irq_data);
192 irq_state_set_masked(desc);
195 void irq_enable(struct irq_desc *desc)
197 irq_state_clr_disabled(desc);
198 if (desc->irq_data.chip->irq_enable)
199 desc->irq_data.chip->irq_enable(&desc->irq_data);
201 desc->irq_data.chip->irq_unmask(&desc->irq_data);
202 irq_state_clr_masked(desc);
205 void irq_disable(struct irq_desc *desc)
207 irq_state_set_disabled(desc);
208 if (desc->irq_data.chip->irq_disable) {
209 desc->irq_data.chip->irq_disable(&desc->irq_data);
210 irq_state_set_masked(desc);
214 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
215 /* Temporary migration helpers */
216 static void compat_irq_mask(struct irq_data *data)
218 data->chip->mask(data->irq);
221 static void compat_irq_unmask(struct irq_data *data)
223 data->chip->unmask(data->irq);
226 static void compat_irq_ack(struct irq_data *data)
228 data->chip->ack(data->irq);
231 static void compat_irq_mask_ack(struct irq_data *data)
233 data->chip->mask_ack(data->irq);
236 static void compat_irq_eoi(struct irq_data *data)
238 data->chip->eoi(data->irq);
241 static void compat_irq_enable(struct irq_data *data)
243 data->chip->enable(data->irq);
246 static void compat_irq_disable(struct irq_data *data)
248 data->chip->disable(data->irq);
251 static void compat_irq_shutdown(struct irq_data *data)
253 data->chip->shutdown(data->irq);
256 static unsigned int compat_irq_startup(struct irq_data *data)
258 return data->chip->startup(data->irq);
261 static int compat_irq_set_affinity(struct irq_data *data,
262 const struct cpumask *dest, bool force)
264 return data->chip->set_affinity(data->irq, dest);
267 static int compat_irq_set_type(struct irq_data *data, unsigned int type)
269 return data->chip->set_type(data->irq, type);
272 static int compat_irq_set_wake(struct irq_data *data, unsigned int on)
274 return data->chip->set_wake(data->irq, on);
277 static int compat_irq_retrigger(struct irq_data *data)
279 return data->chip->retrigger(data->irq);
282 static void compat_bus_lock(struct irq_data *data)
284 data->chip->bus_lock(data->irq);
287 static void compat_bus_sync_unlock(struct irq_data *data)
289 data->chip->bus_sync_unlock(data->irq);
294 * Fixup enable/disable function pointers
296 void irq_chip_set_defaults(struct irq_chip *chip)
298 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
300 chip->irq_enable = compat_irq_enable;
302 chip->irq_disable = compat_irq_disable;
304 chip->irq_shutdown = compat_irq_shutdown;
306 chip->irq_startup = compat_irq_startup;
308 chip->end = dummy_irq_chip.end;
310 chip->irq_bus_lock = compat_bus_lock;
311 if (chip->bus_sync_unlock)
312 chip->irq_bus_sync_unlock = compat_bus_sync_unlock;
314 chip->irq_mask = compat_irq_mask;
316 chip->irq_unmask = compat_irq_unmask;
318 chip->irq_ack = compat_irq_ack;
320 chip->irq_mask_ack = compat_irq_mask_ack;
322 chip->irq_eoi = compat_irq_eoi;
323 if (chip->set_affinity)
324 chip->irq_set_affinity = compat_irq_set_affinity;
326 chip->irq_set_type = compat_irq_set_type;
328 chip->irq_set_wake = compat_irq_set_wake;
330 chip->irq_retrigger = compat_irq_retrigger;
334 static inline void mask_ack_irq(struct irq_desc *desc)
336 if (desc->irq_data.chip->irq_mask_ack)
337 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
339 desc->irq_data.chip->irq_mask(&desc->irq_data);
340 if (desc->irq_data.chip->irq_ack)
341 desc->irq_data.chip->irq_ack(&desc->irq_data);
343 irq_state_set_masked(desc);
346 void mask_irq(struct irq_desc *desc)
348 if (desc->irq_data.chip->irq_mask) {
349 desc->irq_data.chip->irq_mask(&desc->irq_data);
350 irq_state_set_masked(desc);
354 void unmask_irq(struct irq_desc *desc)
356 if (desc->irq_data.chip->irq_unmask) {
357 desc->irq_data.chip->irq_unmask(&desc->irq_data);
358 irq_state_clr_masked(desc);
363 * handle_nested_irq - Handle a nested irq from a irq thread
364 * @irq: the interrupt number
366 * Handle interrupts which are nested into a threaded interrupt
367 * handler. The handler function is called inside the calling
370 void handle_nested_irq(unsigned int irq)
372 struct irq_desc *desc = irq_to_desc(irq);
373 struct irqaction *action;
374 irqreturn_t action_ret;
378 raw_spin_lock_irq(&desc->lock);
380 kstat_incr_irqs_this_cpu(irq, desc);
382 action = desc->action;
383 if (unlikely(!action || (desc->istate & IRQS_DISABLED)))
386 irq_compat_set_progress(desc);
387 desc->istate |= IRQS_INPROGRESS;
388 raw_spin_unlock_irq(&desc->lock);
390 action_ret = action->thread_fn(action->irq, action->dev_id);
392 note_interrupt(irq, desc, action_ret);
394 raw_spin_lock_irq(&desc->lock);
395 desc->istate &= ~IRQS_INPROGRESS;
396 irq_compat_clr_progress(desc);
399 raw_spin_unlock_irq(&desc->lock);
401 EXPORT_SYMBOL_GPL(handle_nested_irq);
403 static bool irq_check_poll(struct irq_desc *desc)
405 if (!(desc->istate & IRQS_POLL_INPROGRESS))
407 return irq_wait_for_poll(desc);
411 * handle_simple_irq - Simple and software-decoded IRQs.
412 * @irq: the interrupt number
413 * @desc: the interrupt description structure for this irq
415 * Simple interrupts are either sent from a demultiplexing interrupt
416 * handler or come from hardware, where no interrupt hardware control
419 * Note: The caller is expected to handle the ack, clear, mask and
420 * unmask issues if necessary.
423 handle_simple_irq(unsigned int irq, struct irq_desc *desc)
425 raw_spin_lock(&desc->lock);
427 if (unlikely(desc->istate & IRQS_INPROGRESS))
428 if (!irq_check_poll(desc))
431 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
432 kstat_incr_irqs_this_cpu(irq, desc);
434 if (unlikely(!desc->action || (desc->istate & IRQS_DISABLED)))
437 handle_irq_event(desc);
440 raw_spin_unlock(&desc->lock);
444 * handle_level_irq - Level type irq handler
445 * @irq: the interrupt number
446 * @desc: the interrupt description structure for this irq
448 * Level type interrupts are active as long as the hardware line has
449 * the active level. This may require to mask the interrupt and unmask
450 * it after the associated handler has acknowledged the device, so the
451 * interrupt line is back to inactive.
454 handle_level_irq(unsigned int irq, struct irq_desc *desc)
456 raw_spin_lock(&desc->lock);
459 if (unlikely(desc->istate & IRQS_INPROGRESS))
460 if (!irq_check_poll(desc))
463 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
464 kstat_incr_irqs_this_cpu(irq, desc);
467 * If its disabled or no action available
468 * keep it masked and get out of here
470 if (unlikely(!desc->action || (desc->istate & IRQS_DISABLED)))
473 handle_irq_event(desc);
475 if (!(desc->istate & (IRQS_DISABLED | IRQS_ONESHOT)))
478 raw_spin_unlock(&desc->lock);
480 EXPORT_SYMBOL_GPL(handle_level_irq);
482 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
483 static inline void preflow_handler(struct irq_desc *desc)
485 if (desc->preflow_handler)
486 desc->preflow_handler(&desc->irq_data);
489 static inline void preflow_handler(struct irq_desc *desc) { }
493 * handle_fasteoi_irq - irq handler for transparent controllers
494 * @irq: the interrupt number
495 * @desc: the interrupt description structure for this irq
497 * Only a single callback will be issued to the chip: an ->eoi()
498 * call when the interrupt has been serviced. This enables support
499 * for modern forms of interrupt handlers, which handle the flow
500 * details in hardware, transparently.
503 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
505 raw_spin_lock(&desc->lock);
507 if (unlikely(desc->istate & IRQS_INPROGRESS))
508 if (!irq_check_poll(desc))
511 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
512 kstat_incr_irqs_this_cpu(irq, desc);
515 * If its disabled or no action available
516 * then mask it and get out of here:
518 if (unlikely(!desc->action || (desc->istate & IRQS_DISABLED))) {
519 irq_compat_set_pending(desc);
520 desc->istate |= IRQS_PENDING;
525 if (desc->istate & IRQS_ONESHOT)
528 preflow_handler(desc);
529 handle_irq_event(desc);
532 desc->irq_data.chip->irq_eoi(&desc->irq_data);
534 raw_spin_unlock(&desc->lock);
537 if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
543 * handle_edge_irq - edge type IRQ handler
544 * @irq: the interrupt number
545 * @desc: the interrupt description structure for this irq
547 * Interrupt occures on the falling and/or rising edge of a hardware
548 * signal. The occurence is latched into the irq controller hardware
549 * and must be acked in order to be reenabled. After the ack another
550 * interrupt can happen on the same source even before the first one
551 * is handled by the associated event handler. If this happens it
552 * might be necessary to disable (mask) the interrupt depending on the
553 * controller hardware. This requires to reenable the interrupt inside
554 * of the loop which handles the interrupts which have arrived while
555 * the handler was running. If all pending interrupts are handled, the
559 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
561 raw_spin_lock(&desc->lock);
563 desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
565 * If we're currently running this IRQ, or its disabled,
566 * we shouldn't process the IRQ. Mark it pending, handle
567 * the necessary masking and go out
569 if (unlikely((desc->istate & (IRQS_DISABLED | IRQS_INPROGRESS) ||
571 if (!irq_check_poll(desc)) {
572 irq_compat_set_pending(desc);
573 desc->istate |= IRQS_PENDING;
578 kstat_incr_irqs_this_cpu(irq, desc);
580 /* Start handling the irq */
581 desc->irq_data.chip->irq_ack(&desc->irq_data);
584 if (unlikely(!desc->action)) {
590 * When another irq arrived while we were handling
591 * one, we could have masked the irq.
592 * Renable it, if it was not disabled in meantime.
594 if (unlikely(desc->istate & IRQS_PENDING)) {
595 if (!(desc->istate & IRQS_DISABLED) &&
596 (desc->istate & IRQS_MASKED))
600 handle_irq_event(desc);
602 } while ((desc->istate & IRQS_PENDING) &&
603 !(desc->istate & IRQS_DISABLED));
606 raw_spin_unlock(&desc->lock);
610 * handle_percpu_irq - Per CPU local irq handler
611 * @irq: the interrupt number
612 * @desc: the interrupt description structure for this irq
614 * Per CPU interrupts on SMP machines without locking requirements
617 handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
619 struct irq_chip *chip = irq_desc_get_chip(desc);
621 kstat_incr_irqs_this_cpu(irq, desc);
624 chip->irq_ack(&desc->irq_data);
626 handle_irq_event_percpu(desc, desc->action);
629 chip->irq_eoi(&desc->irq_data);
633 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
637 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
643 handle = handle_bad_irq;
645 if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
650 if (handle == handle_bad_irq) {
651 if (desc->irq_data.chip != &no_irq_chip)
653 irq_state_set_disabled(desc);
656 desc->handle_irq = handle;
659 if (handle != handle_bad_irq && is_chained) {
660 irq_settings_set_noprobe(desc);
661 irq_settings_set_norequest(desc);
665 irq_put_desc_busunlock(desc, flags);
667 EXPORT_SYMBOL_GPL(__irq_set_handler);
670 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
671 irq_flow_handler_t handle, const char *name)
673 irq_set_chip(irq, chip);
674 __irq_set_handler(irq, handle, 0, name);
677 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
680 struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
684 irq_settings_clr_and_set(desc, clr, set);
686 irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
687 IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
688 if (irq_settings_has_no_balance_set(desc))
689 irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
690 if (irq_settings_is_per_cpu(desc))
691 irqd_set(&desc->irq_data, IRQD_PER_CPU);
692 if (irq_settings_can_move_pcntxt(desc))
693 irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
695 irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
697 irq_put_desc_unlock(desc, flags);