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
22  * lockdep: we want to handle all irq_desc locks as a single lock-class:
56 	if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,  in alloc_masks()
58 		return -ENOMEM;  in alloc_masks()
61 	if (!zalloc_cpumask_var_node(&desc->irq_common_data.effective_affinity,  in alloc_masks()
63 		free_cpumask_var(desc->irq_common_data.affinity);  in alloc_masks()
64 		return -ENOMEM;  in alloc_masks()
69 	if (!zalloc_cpumask_var_node(&desc->pending_mask, GFP_KERNEL, node)) {  in alloc_masks()
71 		free_cpumask_var(desc->irq_common_data.effective_affinity);  in alloc_masks()
73 		free_cpumask_var(desc->irq_common_data.affinity);  in alloc_masks()
74 		return -ENOMEM;  in alloc_masks()
85 	cpumask_copy(desc->irq_common_data.affinity, affinity);  in desc_smp_init()
88 	cpumask_clear(desc->pending_mask);  in desc_smp_init()
91 	desc->irq_common_data.node = node;  in desc_smp_init()
98 	free_cpumask_var(desc->pending_mask);  in free_masks()
100 	free_cpumask_var(desc->irq_common_data.affinity);  in free_masks()
102 	free_cpumask_var(desc->irq_common_data.effective_affinity);  in free_masks()
119 	desc->irq_common_data.handler_data = NULL;  in desc_set_defaults()
120 	desc->irq_common_data.msi_desc = NULL;  in desc_set_defaults()
122 	desc->irq_data.common = &desc->irq_common_data;  in desc_set_defaults()
123 	desc->irq_data.irq = irq;  in desc_set_defaults()
124 	desc->irq_data.chip = &no_irq_chip;  in desc_set_defaults()
125 	desc->irq_data.chip_data = NULL;  in desc_set_defaults()
127 	irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);  in desc_set_defaults()
128 	irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);  in desc_set_defaults()
129 	desc->handle_irq = handle_bad_irq;  in desc_set_defaults()
130 	desc->depth = 1;  in desc_set_defaults()
131 	desc->irq_count = 0;  in desc_set_defaults()
132 	desc->irqs_unhandled = 0;  in desc_set_defaults()
133 	desc->tot_count = 0;  in desc_set_defaults()
134 	desc->name = NULL;  in desc_set_defaults()
135 	desc->owner = owner;  in desc_set_defaults()
137 		*per_cpu_ptr(desc->kstat_irqs, cpu) = (struct irqstat) { };  in desc_set_defaults()
151 static int irq_find_free_area(unsigned int from, unsigned int cnt)  in irq_find_free_area()  argument
155 	if (mas_empty_area(&mas, from, MAX_SPARSE_IRQS, cnt))  in irq_find_free_area()
156 		return -ENOSPC;  in irq_find_free_area()
192 	desc->kstat_irqs = alloc_percpu(struct irqstat);  in init_desc()
193 	if (!desc->kstat_irqs)  in init_desc()
194 		return -ENOMEM;  in init_desc()
197 		free_percpu(desc->kstat_irqs);  in init_desc()
198 		return -ENOMEM;  in init_desc()
201 	raw_spin_lock_init(&desc->lock);  in init_desc()
202 	lockdep_set_class(&desc->lock, &irq_desc_lock_class);  in init_desc()
203 	mutex_init(&desc->request_mutex);  in init_desc()
204 	init_waitqueue_head(&desc->wait_for_threads);  in init_desc()
206 	irqd_set(&desc->irq_data, flags);  in init_desc()
209 	kobject_init(&desc->kobj, &irq_kobj_type);  in init_desc()
210 	init_rcu_head(&desc->rcu);  in init_desc()
227 				  struct kobj_attribute *attr, char *buf)  in per_cpu_count_show()  argument
237 		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);  in per_cpu_count_show()
241 	ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");  in per_cpu_count_show()
247 			      struct kobj_attribute *attr, char *buf)  in chip_name_show()  argument
252 	raw_spin_lock_irq(&desc->lock);  in chip_name_show()
253 	if (desc->irq_data.chip && desc->irq_data.chip->name) {  in chip_name_show()
255 				desc->irq_data.chip->name);  in chip_name_show()
257 	raw_spin_unlock_irq(&desc->lock);  in chip_name_show()
264 			  struct kobj_attribute *attr, char *buf)  in hwirq_show()  argument
269 	raw_spin_lock_irq(&desc->lock);  in hwirq_show()
270 	if (desc->irq_data.domain)  in hwirq_show()
271 		ret = sprintf(buf, "%lu\n", desc->irq_data.hwirq);  in hwirq_show()
272 	raw_spin_unlock_irq(&desc->lock);  in hwirq_show()
279 			 struct kobj_attribute *attr, char *buf)  in type_show()  argument
284 	raw_spin_lock_irq(&desc->lock);  in type_show()
286 		      irqd_is_level_type(&desc->irq_data) ? "level" : "edge");  in type_show()
287 	raw_spin_unlock_irq(&desc->lock);  in type_show()
295 			   struct kobj_attribute *attr, char *buf)  in wakeup_show()  argument
300 	raw_spin_lock_irq(&desc->lock);  in wakeup_show()
302 		      irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled");  in wakeup_show()
303 	raw_spin_unlock_irq(&desc->lock);  in wakeup_show()
311 			 struct kobj_attribute *attr, char *buf)  in name_show()  argument
316 	raw_spin_lock_irq(&desc->lock);  in name_show()
317 	if (desc->name)  in name_show()
318 		ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);  in name_show()
319 	raw_spin_unlock_irq(&desc->lock);  in name_show()
323 IRQ_ATTR_RO(name);
326 			    struct kobj_attribute *attr, char *buf)  in actions_show()  argument
333 	raw_spin_lock_irq(&desc->lock);  in actions_show()
335 		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",  in actions_show()
336 				 p, action->name);  in actions_show()
339 	raw_spin_unlock_irq(&desc->lock);  in actions_show()
342 		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");  in actions_show()
349 	&per_cpu_count_attr.attr,
350 	&chip_name_attr.attr,
351 	&hwirq_attr.attr,
352 	&type_attr.attr,
353 	&wakeup_attr.attr,
354 	&name_attr.attr,
355 	&actions_attr.attr,
374 		if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))  in irq_sysfs_add()
377 			desc->istate |= IRQS_SYSFS;  in irq_sysfs_add()
389 	if (desc->istate & IRQS_SYSFS)  in irq_sysfs_del()
390 		kobject_del(&desc->kobj);  in irq_sysfs_del()
404 		return -ENOMEM;  in irq_sysfs_init()
470 	free_percpu(desc->kstat_irqs);  in irq_kobj_release()
478 	kobject_put(&desc->kobj);  in delayed_free_desc()
506 	call_rcu(&desc->rcu, delayed_free_desc);  in free_desc()
509 static int alloc_descs(unsigned int start, unsigned int cnt, int node,  in alloc_descs()  argument
518 		for (i = 0; i < cnt; i++) {  in alloc_descs()
520 				return -EINVAL;  in alloc_descs()
524 	for (i = 0; i < cnt; i++) {  in alloc_descs()
529 			if (affinity->is_managed) {  in alloc_descs()
534 			mask = &affinity->mask;  in alloc_descs()
549 	for (i--; i >= 0; i--)  in alloc_descs()
551 	return -ENOMEM;  in alloc_descs()
557 		return -ENOMEM;  in irq_expand_nr_irqs()
593 	[0 ... NR_IRQS-1] = {
596 		.lock		= __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
620 	while (--i >= 0) {  in early_irq_init()
639 	raw_spin_lock_irqsave(&desc->lock, flags);  in free_desc()
641 	raw_spin_unlock_irqrestore(&desc->lock, flags);  in free_desc()
645 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,  in alloc_descs()  argument
651 	for (i = 0; i < cnt; i++) {  in alloc_descs()
654 		desc->owner = owner;  in alloc_descs()
662 	return -ENOMEM;  in irq_expand_nr_irqs()
686 		return -EINVAL;  in handle_irq_desc()
690 		return -EPERM;  in handle_irq_desc()
697  * generic_handle_irq - Invoke the handler for a particular irq
700  * Returns:	0 on success, or -EINVAL if conversion has failed
712  * generic_handle_irq_safe - Invoke the handler for a particular irq from any
720  * marked to enforce IRQ-context only.
736  * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
741  * Returns:	0 on success, or -EINVAL if conversion has failed
753  * generic_handle_irq_safe - Invoke the handler for a HW irq belonging
761  * context). If the interrupt is marked as 'enforce IRQ-context only' then
777  * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
782  * Returns:	0 on success, or -EINVAL if conversion has failed
797  * irq_free_descs - free irq descriptors
799  * @cnt:	Number of consecutive irqs to free
801 void irq_free_descs(unsigned int from, unsigned int cnt)  in irq_free_descs()  argument
805 	if (from >= nr_irqs || (from + cnt) > nr_irqs)  in irq_free_descs()
809 	for (i = 0; i < cnt; i++)  in irq_free_descs()
817  * __irq_alloc_descs - allocate and initialize a range of irq descriptors
820  * @cnt:	Number of consecutive irqs to allocate.
823  * @affinity:	Optional pointer to an affinity mask array of size @cnt which
830 __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,  in __irq_alloc_descs()  argument
835 	if (!cnt)  in __irq_alloc_descs()
836 		return -EINVAL;  in __irq_alloc_descs()
840 			return -EINVAL;  in __irq_alloc_descs()
853 	start = irq_find_free_area(from, cnt);  in __irq_alloc_descs()
854 	ret = -EEXIST;  in __irq_alloc_descs()
858 	if (start + cnt > nr_irqs) {  in __irq_alloc_descs()
859 		ret = irq_expand_nr_irqs(start + cnt);  in __irq_alloc_descs()
863 	ret = alloc_descs(start, cnt, node, affinity, owner);  in __irq_alloc_descs()
871  * irq_get_next_irq - get next allocated irq number
900 		raw_spin_lock_irqsave(&desc->lock, *flags);  in __irq_get_desc_lock()
906 	__releases(&desc->lock)  in __irq_put_desc_unlock()
908 	raw_spin_unlock_irqrestore(&desc->lock, flags);  in __irq_put_desc_unlock()
918 	if (!desc || desc->percpu_enabled)  in irq_set_percpu_devid_partition()
919 		return -EINVAL;  in irq_set_percpu_devid_partition()
921 	desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);  in irq_set_percpu_devid_partition()
923 	if (!desc->percpu_enabled)  in irq_set_percpu_devid_partition()
924 		return -ENOMEM;  in irq_set_percpu_devid_partition()
926 	desc->percpu_affinity = affinity ? : cpu_possible_mask;  in irq_set_percpu_devid_partition()
941 	if (!desc || !desc->percpu_enabled)  in irq_get_percpu_devid_partition()
942 		return -EINVAL;  in irq_get_percpu_devid_partition()
945 		cpumask_copy(affinity, desc->percpu_affinity);  in irq_get_percpu_devid_partition()
957  * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
969 	return desc && desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, cpu) : 0;  in kstat_irqs_cpu()
980 		return data_race(desc->tot_count);  in kstat_irqs_desc()
983 		sum += data_race(per_cpu(desc->kstat_irqs->cnt, cpu));  in kstat_irqs_desc()
991 	if (!desc || !desc->kstat_irqs)  in kstat_irqs()
1004 		if (!desc->kstat_irqs)  in kstat_snapshot_irqs()
1006 		this_cpu_write(desc->kstat_irqs->ref, this_cpu_read(desc->kstat_irqs->cnt));  in kstat_snapshot_irqs()
1014 	if (!desc || !desc->kstat_irqs)  in kstat_get_irq_since_snapshot()
1016 	return this_cpu_read(desc->kstat_irqs->cnt) - this_cpu_read(desc->kstat_irqs->ref);  in kstat_get_irq_since_snapshot()
1022  * kstat_irqs_usr - Get the statistics for an interrupt from thread context
1048 		lockdep_set_class(&desc->lock, lock_class);  in __irq_set_lockdep_class()
1049 		lockdep_set_class(&desc->request_mutex, request_class);  in __irq_set_lockdep_class()