1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4  * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
7  * information is available in Documentation/core-api/genericirq.rst
23  * lockdep: we want to handle all irq_desc locks as a single lock-class:
57 	if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,  in alloc_masks()
59 		return -ENOMEM;  in alloc_masks()
62 	if (!zalloc_cpumask_var_node(&desc->irq_common_data.effective_affinity,  in alloc_masks()
64 		free_cpumask_var(desc->irq_common_data.affinity);  in alloc_masks()
65 		return -ENOMEM;  in alloc_masks()
70 	if (!zalloc_cpumask_var_node(&desc->pending_mask, GFP_KERNEL, node)) {  in alloc_masks()
72 		free_cpumask_var(desc->irq_common_data.effective_affinity);  in alloc_masks()
74 		free_cpumask_var(desc->irq_common_data.affinity);  in alloc_masks()
75 		return -ENOMEM;  in alloc_masks()
86 	cpumask_copy(desc->irq_common_data.affinity, affinity);  in desc_smp_init()
89 	cpumask_clear(desc->pending_mask);  in desc_smp_init()
92 	desc->irq_common_data.node = node;  in desc_smp_init()
99 	free_cpumask_var(desc->pending_mask);  in free_masks()
101 	free_cpumask_var(desc->irq_common_data.affinity);  in free_masks()
103 	free_cpumask_var(desc->irq_common_data.effective_affinity);  in free_masks()
120 	desc->irq_common_data.handler_data = NULL;  in desc_set_defaults()
121 	desc->irq_common_data.msi_desc = NULL;  in desc_set_defaults()
123 	desc->irq_data.common = &desc->irq_common_data;  in desc_set_defaults()
124 	desc->irq_data.irq = irq;  in desc_set_defaults()
125 	desc->irq_data.chip = &no_irq_chip;  in desc_set_defaults()
126 	desc->irq_data.chip_data = NULL;  in desc_set_defaults()
128 	irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);  in desc_set_defaults()
129 	irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);  in desc_set_defaults()
130 	desc->handle_irq = handle_bad_irq;  in desc_set_defaults()
131 	desc->depth = 1;  in desc_set_defaults()
132 	desc->irq_count = 0;  in desc_set_defaults()
133 	desc->irqs_unhandled = 0;  in desc_set_defaults()
134 	desc->tot_count = 0;  in desc_set_defaults()
135 	desc->name = NULL;  in desc_set_defaults()
136 	desc->owner = owner;  in desc_set_defaults()
138 		*per_cpu_ptr(desc->kstat_irqs, cpu) = (struct irqstat) { };  in desc_set_defaults()
145  * irq_get_nr_irqs() - Number of interrupts supported by the system.
154  * irq_set_nr_irqs() - Set the number of interrupts supported by the system.
174 static int irq_find_free_area(unsigned int from, unsigned int cnt)  in irq_find_free_area()  argument
178 	if (mas_empty_area(&mas, from, MAX_SPARSE_IRQS, cnt))  in irq_find_free_area()
179 		return -ENOSPC;  in irq_find_free_area()
215 	desc->kstat_irqs = alloc_percpu(struct irqstat);  in init_desc()
216 	if (!desc->kstat_irqs)  in init_desc()
217 		return -ENOMEM;  in init_desc()
220 		free_percpu(desc->kstat_irqs);  in init_desc()
221 		return -ENOMEM;  in init_desc()
224 	raw_spin_lock_init(&desc->lock);  in init_desc()
225 	lockdep_set_class(&desc->lock, &irq_desc_lock_class);  in init_desc()
226 	mutex_init(&desc->request_mutex);  in init_desc()
227 	init_waitqueue_head(&desc->wait_for_threads);  in init_desc()
229 	irqd_set(&desc->irq_data, flags);  in init_desc()
232 	kobject_init(&desc->kobj, &irq_kobj_type);  in init_desc()
233 	init_rcu_head(&desc->rcu);  in init_desc()
250 				  struct kobj_attribute *attr, char *buf)  in per_cpu_count_show()  argument
260 		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);  in per_cpu_count_show()
264 	ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");  in per_cpu_count_show()
270 			      struct kobj_attribute *attr, char *buf)  in chip_name_show()  argument
275 	raw_spin_lock_irq(&desc->lock);  in chip_name_show()
276 	if (desc->irq_data.chip && desc->irq_data.chip->name) {  in chip_name_show()
278 				desc->irq_data.chip->name);  in chip_name_show()
280 	raw_spin_unlock_irq(&desc->lock);  in chip_name_show()
287 			  struct kobj_attribute *attr, char *buf)  in hwirq_show()  argument
292 	raw_spin_lock_irq(&desc->lock);  in hwirq_show()
293 	if (desc->irq_data.domain)  in hwirq_show()
294 		ret = sprintf(buf, "%lu\n", desc->irq_data.hwirq);  in hwirq_show()
295 	raw_spin_unlock_irq(&desc->lock);  in hwirq_show()
302 			 struct kobj_attribute *attr, char *buf)  in type_show()  argument
307 	raw_spin_lock_irq(&desc->lock);  in type_show()
309 		      irqd_is_level_type(&desc->irq_data) ? "level" : "edge");  in type_show()
310 	raw_spin_unlock_irq(&desc->lock);  in type_show()
318 			   struct kobj_attribute *attr, char *buf)  in wakeup_show()  argument
323 	raw_spin_lock_irq(&desc->lock);  in wakeup_show()
324 	ret = sprintf(buf, "%s\n", str_enabled_disabled(irqd_is_wakeup_set(&desc->irq_data)));  in wakeup_show()
325 	raw_spin_unlock_irq(&desc->lock);  in wakeup_show()
333 			 struct kobj_attribute *attr, char *buf)  in name_show()  argument
338 	raw_spin_lock_irq(&desc->lock);  in name_show()
339 	if (desc->name)  in name_show()
340 		ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);  in name_show()
341 	raw_spin_unlock_irq(&desc->lock);  in name_show()
345 IRQ_ATTR_RO(name);
348 			    struct kobj_attribute *attr, char *buf)  in actions_show()  argument
355 	raw_spin_lock_irq(&desc->lock);  in actions_show()
357 		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",  in actions_show()
358 				 p, action->name);  in actions_show()
361 	raw_spin_unlock_irq(&desc->lock);  in actions_show()
364 		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");  in actions_show()
371 	&per_cpu_count_attr.attr,
372 	&chip_name_attr.attr,
373 	&hwirq_attr.attr,
374 	&type_attr.attr,
375 	&wakeup_attr.attr,
376 	&name_attr.attr,
377 	&actions_attr.attr,
396 		if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))  in irq_sysfs_add()
399 			desc->istate |= IRQS_SYSFS;  in irq_sysfs_add()
411 	if (desc->istate & IRQS_SYSFS)  in irq_sysfs_del()
412 		kobject_del(&desc->kobj);  in irq_sysfs_del()
426 		return -ENOMEM;  in irq_sysfs_init()
492 	free_percpu(desc->kstat_irqs);  in irq_kobj_release()
500 	kobject_put(&desc->kobj);  in delayed_free_desc()
528 	call_rcu(&desc->rcu, delayed_free_desc);  in free_desc()
531 static int alloc_descs(unsigned int start, unsigned int cnt, int node,  in alloc_descs()  argument
540 		for (i = 0; i < cnt; i++) {  in alloc_descs()
542 				return -EINVAL;  in alloc_descs()
546 	for (i = 0; i < cnt; i++) {  in alloc_descs()
551 			if (affinity->is_managed) {  in alloc_descs()
556 			mask = &affinity->mask;  in alloc_descs()
571 	for (i--; i >= 0; i--)  in alloc_descs()
573 	return -ENOMEM;  in alloc_descs()
579 		return -ENOMEM;  in irq_expand_nr_irqs()
615 	[0 ... NR_IRQS-1] = {
618 		.lock		= __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
642 	while (--i >= 0) {  in early_irq_init()
661 	raw_spin_lock_irqsave(&desc->lock, flags);  in free_desc()
663 	raw_spin_unlock_irqrestore(&desc->lock, flags);  in free_desc()
667 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,  in alloc_descs()  argument
673 	for (i = 0; i < cnt; i++) {  in alloc_descs()
676 		desc->owner = owner;  in alloc_descs()
684 	return -ENOMEM;  in irq_expand_nr_irqs()
708 		return -EINVAL;  in handle_irq_desc()
712 		return -EPERM;  in handle_irq_desc()
719  * generic_handle_irq - Invoke the handler for a particular irq
722  * Returns:	0 on success, or -EINVAL if conversion has failed
734  * generic_handle_irq_safe - Invoke the handler for a particular irq from any
742  * marked to enforce IRQ-context only.
758  * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
763  * Returns:	0 on success, or -EINVAL if conversion has failed
775  * generic_handle_irq_safe - Invoke the handler for a HW irq belonging
783  * context). If the interrupt is marked as 'enforce IRQ-context only' then
799  * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
804  * Returns:	0 on success, or -EINVAL if conversion has failed
819  * irq_free_descs - free irq descriptors
821  * @cnt:	Number of consecutive irqs to free
823 void irq_free_descs(unsigned int from, unsigned int cnt)  in irq_free_descs()  argument
827 	if (from >= nr_irqs || (from + cnt) > nr_irqs)  in irq_free_descs()
831 	for (i = 0; i < cnt; i++)  in irq_free_descs()
839  * __irq_alloc_descs - allocate and initialize a range of irq descriptors
842  * @cnt:	Number of consecutive irqs to allocate.
845  * @affinity:	Optional pointer to an affinity mask array of size @cnt which
852 __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,  in __irq_alloc_descs()  argument
857 	if (!cnt)  in __irq_alloc_descs()
858 		return -EINVAL;  in __irq_alloc_descs()
862 			return -EINVAL;  in __irq_alloc_descs()
875 	start = irq_find_free_area(from, cnt);  in __irq_alloc_descs()
876 	ret = -EEXIST;  in __irq_alloc_descs()
880 	if (start + cnt > nr_irqs) {  in __irq_alloc_descs()
881 		ret = irq_expand_nr_irqs(start + cnt);  in __irq_alloc_descs()
885 	ret = alloc_descs(start, cnt, node, affinity, owner);  in __irq_alloc_descs()
893  * irq_get_next_irq - get next allocated irq number
922 		raw_spin_lock_irqsave(&desc->lock, *flags);  in __irq_get_desc_lock()
928 	__releases(&desc->lock)  in __irq_put_desc_unlock()
930 	raw_spin_unlock_irqrestore(&desc->lock, flags);  in __irq_put_desc_unlock()
940 	if (!desc || desc->percpu_enabled)  in irq_set_percpu_devid_partition()
941 		return -EINVAL;  in irq_set_percpu_devid_partition()
943 	desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);  in irq_set_percpu_devid_partition()
945 	if (!desc->percpu_enabled)  in irq_set_percpu_devid_partition()
946 		return -ENOMEM;  in irq_set_percpu_devid_partition()
948 	desc->percpu_affinity = affinity ? : cpu_possible_mask;  in irq_set_percpu_devid_partition()
963 	if (!desc || !desc->percpu_enabled)  in irq_get_percpu_devid_partition()
964 		return -EINVAL;  in irq_get_percpu_devid_partition()
967 		cpumask_copy(affinity, desc->percpu_affinity);  in irq_get_percpu_devid_partition()
979  * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
991 	return desc && desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, cpu) : 0;  in kstat_irqs_cpu()
1002 		return data_race(desc->tot_count);  in kstat_irqs_desc()
1005 		sum += data_race(per_cpu(desc->kstat_irqs->cnt, cpu));  in kstat_irqs_desc()
1013 	if (!desc || !desc->kstat_irqs)  in kstat_irqs()
1026 		if (!desc->kstat_irqs)  in kstat_snapshot_irqs()
1028 		this_cpu_write(desc->kstat_irqs->ref, this_cpu_read(desc->kstat_irqs->cnt));  in kstat_snapshot_irqs()
1036 	if (!desc || !desc->kstat_irqs)  in kstat_get_irq_since_snapshot()
1038 	return this_cpu_read(desc->kstat_irqs->cnt) - this_cpu_read(desc->kstat_irqs->ref);  in kstat_get_irq_since_snapshot()
1044  * kstat_irqs_usr - Get the statistics for an interrupt from thread context
1070 		lockdep_set_class(&desc->lock, lock_class);  in __irq_set_lockdep_class()
1071 		lockdep_set_class(&desc->request_mutex, request_class);  in __irq_set_lockdep_class()