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()
107 	desc->irq_common_data.handler_data = NULL;  in desc_set_defaults()
108 	desc->irq_common_data.msi_desc = NULL;  in desc_set_defaults()
110 	desc->irq_data.common = &desc->irq_common_data;  in desc_set_defaults()
111 	desc->irq_data.irq = irq;  in desc_set_defaults()
112 	desc->irq_data.chip = &no_irq_chip;  in desc_set_defaults()
113 	desc->irq_data.chip_data = NULL;  in desc_set_defaults()
115 	irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);  in desc_set_defaults()
116 	irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);  in desc_set_defaults()
117 	desc->handle_irq = handle_bad_irq;  in desc_set_defaults()
118 	desc->depth = 1;  in desc_set_defaults()
119 	desc->irq_count = 0;  in desc_set_defaults()
120 	desc->irqs_unhandled = 0;  in desc_set_defaults()
121 	desc->tot_count = 0;  in desc_set_defaults()
122 	desc->name = NULL;  in desc_set_defaults()
123 	desc->owner = owner;  in desc_set_defaults()
125 		*per_cpu_ptr(desc->kstat_irqs, cpu) = 0;  in desc_set_defaults()
139 static int irq_find_free_area(unsigned int from, unsigned int cnt)  in irq_find_free_area()  argument
143 	if (mas_empty_area(&mas, from, MAX_SPARSE_IRQS, cnt))  in irq_find_free_area()
144 		return -ENOSPC;  in irq_find_free_area()
179 				  struct kobj_attribute *attr, char *buf)  in per_cpu_count_show()  argument
189 		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);  in per_cpu_count_show()
193 	ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");  in per_cpu_count_show()
199 			      struct kobj_attribute *attr, char *buf)  in chip_name_show()  argument
204 	raw_spin_lock_irq(&desc->lock);  in chip_name_show()
205 	if (desc->irq_data.chip && desc->irq_data.chip->name) {  in chip_name_show()
207 				desc->irq_data.chip->name);  in chip_name_show()
209 	raw_spin_unlock_irq(&desc->lock);  in chip_name_show()
216 			  struct kobj_attribute *attr, char *buf)  in hwirq_show()  argument
221 	raw_spin_lock_irq(&desc->lock);  in hwirq_show()
222 	if (desc->irq_data.domain)  in hwirq_show()
223 		ret = sprintf(buf, "%lu\n", desc->irq_data.hwirq);  in hwirq_show()
224 	raw_spin_unlock_irq(&desc->lock);  in hwirq_show()
231 			 struct kobj_attribute *attr, char *buf)  in type_show()  argument
236 	raw_spin_lock_irq(&desc->lock);  in type_show()
238 		      irqd_is_level_type(&desc->irq_data) ? "level" : "edge");  in type_show()
239 	raw_spin_unlock_irq(&desc->lock);  in type_show()
247 			   struct kobj_attribute *attr, char *buf)  in wakeup_show()  argument
252 	raw_spin_lock_irq(&desc->lock);  in wakeup_show()
254 		      irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled");  in wakeup_show()
255 	raw_spin_unlock_irq(&desc->lock);  in wakeup_show()
263 			 struct kobj_attribute *attr, char *buf)  in name_show()  argument
268 	raw_spin_lock_irq(&desc->lock);  in name_show()
269 	if (desc->name)  in name_show()
270 		ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);  in name_show()
271 	raw_spin_unlock_irq(&desc->lock);  in name_show()
275 IRQ_ATTR_RO(name);
278 			    struct kobj_attribute *attr, char *buf)  in actions_show()  argument
285 	raw_spin_lock_irq(&desc->lock);  in actions_show()
287 		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",  in actions_show()
288 				 p, action->name);  in actions_show()
291 	raw_spin_unlock_irq(&desc->lock);  in actions_show()
294 		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");  in actions_show()
301 	&per_cpu_count_attr.attr,
302 	&chip_name_attr.attr,
303 	&hwirq_attr.attr,
304 	&type_attr.attr,
305 	&wakeup_attr.attr,
306 	&name_attr.attr,
307 	&actions_attr.attr,
326 		if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))  in irq_sysfs_add()
329 			desc->istate |= IRQS_SYSFS;  in irq_sysfs_add()
341 	if (desc->istate & IRQS_SYSFS)  in irq_sysfs_del()
342 		kobject_del(&desc->kobj);  in irq_sysfs_del()
356 		return -ENOMEM;  in irq_sysfs_init()
391 	free_cpumask_var(desc->pending_mask);  in free_masks()
393 	free_cpumask_var(desc->irq_common_data.affinity);  in free_masks()
395 	free_cpumask_var(desc->irq_common_data.effective_affinity);  in free_masks()
422 	desc->kstat_irqs = alloc_percpu(unsigned int);  in alloc_desc()
423 	if (!desc->kstat_irqs)  in alloc_desc()
429 	raw_spin_lock_init(&desc->lock);  in alloc_desc()
430 	lockdep_set_class(&desc->lock, &irq_desc_lock_class);  in alloc_desc()
431 	mutex_init(&desc->request_mutex);  in alloc_desc()
432 	init_rcu_head(&desc->rcu);  in alloc_desc()
433 	init_waitqueue_head(&desc->wait_for_threads);  in alloc_desc()
436 	irqd_set(&desc->irq_data, flags);  in alloc_desc()
437 	kobject_init(&desc->kobj, &irq_kobj_type);  in alloc_desc()
443 	free_percpu(desc->kstat_irqs);  in alloc_desc()
454 	free_percpu(desc->kstat_irqs);  in irq_kobj_release()
462 	kobject_put(&desc->kobj);  in delayed_free_desc()
490 	call_rcu(&desc->rcu, delayed_free_desc);  in free_desc()
493 static int alloc_descs(unsigned int start, unsigned int cnt, int node,  in alloc_descs()  argument
502 		for (i = 0; i < cnt; i++) {  in alloc_descs()
504 				return -EINVAL;  in alloc_descs()
508 	for (i = 0; i < cnt; i++) {  in alloc_descs()
513 			if (affinity->is_managed) {  in alloc_descs()
517 			mask = &affinity->mask;  in alloc_descs()
532 	for (i--; i >= 0; i--)  in alloc_descs()
534 	return -ENOMEM;  in alloc_descs()
540 		return -ENOMEM;  in irq_expand_nr_irqs()
576 	[0 ... NR_IRQS-1] = {
579 		.lock		= __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
619 	raw_spin_lock_irqsave(&desc->lock, flags);  in free_desc()
621 	raw_spin_unlock_irqrestore(&desc->lock, flags);  in free_desc()
625 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,  in alloc_descs()  argument
631 	for (i = 0; i < cnt; i++) {  in alloc_descs()
634 		desc->owner = owner;  in alloc_descs()
642 	return -ENOMEM;  in irq_expand_nr_irqs()
666 		return -EINVAL;  in handle_irq_desc()
670 		return -EPERM;  in handle_irq_desc()
677  * generic_handle_irq - Invoke the handler for a particular irq
680  * Returns:	0 on success, or -EINVAL if conversion has failed
692  * generic_handle_irq_safe - Invoke the handler for a particular irq from any
700  * marked to enforce IRQ-context only.
716  * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
721  * Returns:	0 on success, or -EINVAL if conversion has failed
733  * generic_handle_irq_safe - Invoke the handler for a HW irq belonging
741  * context). If the interrupt is marked as 'enforce IRQ-context only' then
757  * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
762  * Returns:	0 on success, or -EINVAL if conversion has failed
777  * irq_free_descs - free irq descriptors
779  * @cnt:	Number of consecutive irqs to free
781 void irq_free_descs(unsigned int from, unsigned int cnt)  in irq_free_descs()  argument
785 	if (from >= nr_irqs || (from + cnt) > nr_irqs)  in irq_free_descs()
789 	for (i = 0; i < cnt; i++)  in irq_free_descs()
797  * __irq_alloc_descs - allocate and initialize a range of irq descriptors
800  * @cnt:	Number of consecutive irqs to allocate.
803  * @affinity:	Optional pointer to an affinity mask array of size @cnt which
810 __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,  in __irq_alloc_descs()  argument
815 	if (!cnt)  in __irq_alloc_descs()
816 		return -EINVAL;  in __irq_alloc_descs()
820 			return -EINVAL;  in __irq_alloc_descs()
833 	start = irq_find_free_area(from, cnt);  in __irq_alloc_descs()
834 	ret = -EEXIST;  in __irq_alloc_descs()
838 	if (start + cnt > nr_irqs) {  in __irq_alloc_descs()
839 		ret = irq_expand_nr_irqs(start + cnt);  in __irq_alloc_descs()
843 	ret = alloc_descs(start, cnt, node, affinity, owner);  in __irq_alloc_descs()
851  * irq_get_next_irq - get next allocated irq number
880 		raw_spin_lock_irqsave(&desc->lock, *flags);  in __irq_get_desc_lock()
886 	__releases(&desc->lock)  in __irq_put_desc_unlock()
888 	raw_spin_unlock_irqrestore(&desc->lock, flags);  in __irq_put_desc_unlock()
899 		return -EINVAL;  in irq_set_percpu_devid_partition()
901 	if (desc->percpu_enabled)  in irq_set_percpu_devid_partition()
902 		return -EINVAL;  in irq_set_percpu_devid_partition()
904 	desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);  in irq_set_percpu_devid_partition()
906 	if (!desc->percpu_enabled)  in irq_set_percpu_devid_partition()
907 		return -ENOMEM;  in irq_set_percpu_devid_partition()
910 		desc->percpu_affinity = affinity;  in irq_set_percpu_devid_partition()
912 		desc->percpu_affinity = cpu_possible_mask;  in irq_set_percpu_devid_partition()
927 	if (!desc || !desc->percpu_enabled)  in irq_get_percpu_devid_partition()
928 		return -EINVAL;  in irq_get_percpu_devid_partition()
931 		cpumask_copy(affinity, desc->percpu_affinity);  in irq_get_percpu_devid_partition()
943  * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
955 	return desc && desc->kstat_irqs ?  in kstat_irqs_cpu()
956 			*per_cpu_ptr(desc->kstat_irqs, cpu) : 0;  in kstat_irqs_cpu()
961 	return desc->istate & IRQS_NMI;  in irq_is_nmi()
970 	if (!desc || !desc->kstat_irqs)  in kstat_irqs()
975 		return data_race(desc->tot_count);  in kstat_irqs()
978 		sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));  in kstat_irqs()
983  * kstat_irqs_usr - Get the statistics for an interrupt from thread context
1009 		lockdep_set_class(&desc->lock, lock_class);  in __irq_set_lockdep_class()
1010 		lockdep_set_class(&desc->request_mutex, request_class);  in __irq_set_lockdep_class()