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
6 * This file contains the interrupt descriptor management code. Detailed
7 * information is available in Documentation/core-api/genericirq.rst
10 #include <linux/irq.h>
11 #include <linux/slab.h>
12 #include <linux/export.h>
13 #include <linux/interrupt.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/maple_tree.h>
16 #include <linux/irqdomain.h>
17 #include <linux/sysfs.h>
19 #include "internals.h"
22 * lockdep: we want to handle all irq_desc locks as a single lock-class:
24 static struct lock_class_key irq_desc_lock_class;
26 #if defined(CONFIG_SMP)
27 static int __init irq_affinity_setup(char *str)
29 alloc_bootmem_cpumask_var(&irq_default_affinity);
30 cpulist_parse(str, irq_default_affinity);
32 * Set at least the boot cpu. We don't want to end up with
33 * bugreports caused by random commandline masks
35 cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
38 __setup("irqaffinity=", irq_affinity_setup);
40 static void __init init_irq_default_affinity(void)
42 if (!cpumask_available(irq_default_affinity))
43 zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
44 if (cpumask_empty(irq_default_affinity))
45 cpumask_setall(irq_default_affinity);
48 static void __init init_irq_default_affinity(void)
54 static int alloc_masks(struct irq_desc *desc, int node)
56 if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,
60 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
61 if (!zalloc_cpumask_var_node(&desc->irq_common_data.effective_affinity,
63 free_cpumask_var(desc->irq_common_data.affinity);
68 #ifdef CONFIG_GENERIC_PENDING_IRQ
69 if (!zalloc_cpumask_var_node(&desc->pending_mask, GFP_KERNEL, node)) {
70 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
71 free_cpumask_var(desc->irq_common_data.effective_affinity);
73 free_cpumask_var(desc->irq_common_data.affinity);
80 static void desc_smp_init(struct irq_desc *desc, int node,
81 const struct cpumask *affinity)
84 affinity = irq_default_affinity;
85 cpumask_copy(desc->irq_common_data.affinity, affinity);
87 #ifdef CONFIG_GENERIC_PENDING_IRQ
88 cpumask_clear(desc->pending_mask);
91 desc->irq_common_data.node = node;
95 static void free_masks(struct irq_desc *desc)
97 #ifdef CONFIG_GENERIC_PENDING_IRQ
98 free_cpumask_var(desc->pending_mask);
100 free_cpumask_var(desc->irq_common_data.affinity);
101 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
102 free_cpumask_var(desc->irq_common_data.effective_affinity);
108 alloc_masks(struct irq_desc *desc, int node) { return 0; }
110 desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { }
111 static inline void free_masks(struct irq_desc *desc) { }
114 static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
115 const struct cpumask *affinity, struct module *owner)
119 desc->irq_common_data.handler_data = NULL;
120 desc->irq_common_data.msi_desc = NULL;
122 desc->irq_data.common = &desc->irq_common_data;
123 desc->irq_data.irq = irq;
124 desc->irq_data.chip = &no_irq_chip;
125 desc->irq_data.chip_data = NULL;
126 irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
127 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
128 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
129 desc->handle_irq = handle_bad_irq;
132 desc->irqs_unhandled = 0;
136 for_each_possible_cpu(cpu)
137 *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
138 desc_smp_init(desc, node, affinity);
141 int nr_irqs = NR_IRQS;
142 EXPORT_SYMBOL_GPL(nr_irqs);
144 static DEFINE_MUTEX(sparse_irq_lock);
145 static struct maple_tree sparse_irqs = MTREE_INIT_EXT(sparse_irqs,
146 MT_FLAGS_ALLOC_RANGE |
147 MT_FLAGS_LOCK_EXTERN |
151 static int irq_find_free_area(unsigned int from, unsigned int cnt)
153 MA_STATE(mas, &sparse_irqs, 0, 0);
155 if (mas_empty_area(&mas, from, MAX_SPARSE_IRQS, cnt))
160 static unsigned int irq_find_at_or_after(unsigned int offset)
162 unsigned long index = offset;
163 struct irq_desc *desc = mt_find(&sparse_irqs, &index, nr_irqs);
165 return desc ? irq_desc_get_irq(desc) : nr_irqs;
168 static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
170 MA_STATE(mas, &sparse_irqs, irq, irq);
171 WARN_ON(mas_store_gfp(&mas, desc, GFP_KERNEL) != 0);
174 static void delete_irq_desc(unsigned int irq)
176 MA_STATE(mas, &sparse_irqs, irq, irq);
180 #ifdef CONFIG_SPARSE_IRQ
181 static const struct kobj_type irq_kobj_type;
184 static int init_desc(struct irq_desc *desc, int irq, int node,
186 const struct cpumask *affinity,
187 struct module *owner)
189 desc->kstat_irqs = alloc_percpu(unsigned int);
190 if (!desc->kstat_irqs)
193 if (alloc_masks(desc, node)) {
194 free_percpu(desc->kstat_irqs);
198 raw_spin_lock_init(&desc->lock);
199 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
200 mutex_init(&desc->request_mutex);
201 init_waitqueue_head(&desc->wait_for_threads);
202 desc_set_defaults(irq, desc, node, affinity, owner);
203 irqd_set(&desc->irq_data, flags);
204 irq_resend_init(desc);
205 #ifdef CONFIG_SPARSE_IRQ
206 kobject_init(&desc->kobj, &irq_kobj_type);
207 init_rcu_head(&desc->rcu);
213 #ifdef CONFIG_SPARSE_IRQ
215 static void irq_kobj_release(struct kobject *kobj);
218 static struct kobject *irq_kobj_base;
220 #define IRQ_ATTR_RO(_name) \
221 static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
223 static ssize_t per_cpu_count_show(struct kobject *kobj,
224 struct kobj_attribute *attr, char *buf)
226 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
231 for_each_possible_cpu(cpu) {
232 unsigned int c = irq_desc_kstat_cpu(desc, cpu);
234 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
238 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
241 IRQ_ATTR_RO(per_cpu_count);
243 static ssize_t chip_name_show(struct kobject *kobj,
244 struct kobj_attribute *attr, char *buf)
246 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
249 raw_spin_lock_irq(&desc->lock);
250 if (desc->irq_data.chip && desc->irq_data.chip->name) {
251 ret = scnprintf(buf, PAGE_SIZE, "%s\n",
252 desc->irq_data.chip->name);
254 raw_spin_unlock_irq(&desc->lock);
258 IRQ_ATTR_RO(chip_name);
260 static ssize_t hwirq_show(struct kobject *kobj,
261 struct kobj_attribute *attr, char *buf)
263 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
266 raw_spin_lock_irq(&desc->lock);
267 if (desc->irq_data.domain)
268 ret = sprintf(buf, "%lu\n", desc->irq_data.hwirq);
269 raw_spin_unlock_irq(&desc->lock);
275 static ssize_t type_show(struct kobject *kobj,
276 struct kobj_attribute *attr, char *buf)
278 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
281 raw_spin_lock_irq(&desc->lock);
282 ret = sprintf(buf, "%s\n",
283 irqd_is_level_type(&desc->irq_data) ? "level" : "edge");
284 raw_spin_unlock_irq(&desc->lock);
291 static ssize_t wakeup_show(struct kobject *kobj,
292 struct kobj_attribute *attr, char *buf)
294 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
297 raw_spin_lock_irq(&desc->lock);
298 ret = sprintf(buf, "%s\n",
299 irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled");
300 raw_spin_unlock_irq(&desc->lock);
307 static ssize_t name_show(struct kobject *kobj,
308 struct kobj_attribute *attr, char *buf)
310 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
313 raw_spin_lock_irq(&desc->lock);
315 ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);
316 raw_spin_unlock_irq(&desc->lock);
322 static ssize_t actions_show(struct kobject *kobj,
323 struct kobj_attribute *attr, char *buf)
325 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
326 struct irqaction *action;
330 raw_spin_lock_irq(&desc->lock);
331 for_each_action_of_desc(desc, action) {
332 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
336 raw_spin_unlock_irq(&desc->lock);
339 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
343 IRQ_ATTR_RO(actions);
345 static struct attribute *irq_attrs[] = {
346 &per_cpu_count_attr.attr,
347 &chip_name_attr.attr,
355 ATTRIBUTE_GROUPS(irq);
357 static const struct kobj_type irq_kobj_type = {
358 .release = irq_kobj_release,
359 .sysfs_ops = &kobj_sysfs_ops,
360 .default_groups = irq_groups,
363 static void irq_sysfs_add(int irq, struct irq_desc *desc)
367 * Continue even in case of failure as this is nothing
368 * crucial and failures in the late irq_sysfs_init()
369 * cannot be rolled back.
371 if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
372 pr_warn("Failed to add kobject for irq %d\n", irq);
374 desc->istate |= IRQS_SYSFS;
378 static void irq_sysfs_del(struct irq_desc *desc)
381 * Only invoke kobject_del() when kobject_add() was successfully
382 * invoked for the descriptor. This covers both early boot, where
383 * sysfs is not initialized yet, and the case of a failed
384 * kobject_add() invocation.
386 if (desc->istate & IRQS_SYSFS)
387 kobject_del(&desc->kobj);
390 static int __init irq_sysfs_init(void)
392 struct irq_desc *desc;
395 /* Prevent concurrent irq alloc/free */
398 irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
399 if (!irq_kobj_base) {
404 /* Add the already allocated interrupts */
405 for_each_irq_desc(irq, desc)
406 irq_sysfs_add(irq, desc);
411 postcore_initcall(irq_sysfs_init);
413 #else /* !CONFIG_SYSFS */
415 static const struct kobj_type irq_kobj_type = {
416 .release = irq_kobj_release,
419 static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
420 static void irq_sysfs_del(struct irq_desc *desc) {}
422 #endif /* CONFIG_SYSFS */
424 struct irq_desc *irq_to_desc(unsigned int irq)
426 return mtree_load(&sparse_irqs, irq);
428 #ifdef CONFIG_KVM_BOOK3S_64_HV_MODULE
429 EXPORT_SYMBOL_GPL(irq_to_desc);
432 void irq_lock_sparse(void)
434 mutex_lock(&sparse_irq_lock);
437 void irq_unlock_sparse(void)
439 mutex_unlock(&sparse_irq_lock);
442 static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
443 const struct cpumask *affinity,
444 struct module *owner)
446 struct irq_desc *desc;
449 desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
453 ret = init_desc(desc, irq, node, flags, affinity, owner);
462 static void irq_kobj_release(struct kobject *kobj)
464 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
467 free_percpu(desc->kstat_irqs);
471 static void delayed_free_desc(struct rcu_head *rhp)
473 struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
475 kobject_put(&desc->kobj);
478 static void free_desc(unsigned int irq)
480 struct irq_desc *desc = irq_to_desc(irq);
482 irq_remove_debugfs_entry(desc);
483 unregister_irq_proc(irq, desc);
486 * sparse_irq_lock protects also show_interrupts() and
487 * kstat_irq_usr(). Once we deleted the descriptor from the
488 * sparse tree we can free it. Access in proc will fail to
489 * lookup the descriptor.
491 * The sysfs entry must be serialized against a concurrent
492 * irq_sysfs_init() as well.
495 delete_irq_desc(irq);
498 * We free the descriptor, masks and stat fields via RCU. That
499 * allows demultiplex interrupts to do rcu based management of
500 * the child interrupts.
501 * This also allows us to use rcu in kstat_irqs_usr().
503 call_rcu(&desc->rcu, delayed_free_desc);
506 static int alloc_descs(unsigned int start, unsigned int cnt, int node,
507 const struct irq_affinity_desc *affinity,
508 struct module *owner)
510 struct irq_desc *desc;
513 /* Validate affinity mask(s) */
515 for (i = 0; i < cnt; i++) {
516 if (cpumask_empty(&affinity[i].mask))
521 for (i = 0; i < cnt; i++) {
522 const struct cpumask *mask = NULL;
523 unsigned int flags = 0;
526 if (affinity->is_managed) {
527 flags = IRQD_AFFINITY_MANAGED |
528 IRQD_MANAGED_SHUTDOWN;
530 mask = &affinity->mask;
531 node = cpu_to_node(cpumask_first(mask));
535 desc = alloc_desc(start + i, node, flags, mask, owner);
538 irq_insert_desc(start + i, desc);
539 irq_sysfs_add(start + i, desc);
540 irq_add_debugfs_entry(start + i, desc);
545 for (i--; i >= 0; i--)
546 free_desc(start + i);
550 static int irq_expand_nr_irqs(unsigned int nr)
552 if (nr > MAX_SPARSE_IRQS)
558 int __init early_irq_init(void)
560 int i, initcnt, node = first_online_node;
561 struct irq_desc *desc;
563 init_irq_default_affinity();
565 /* Let arch update nr_irqs and return the nr of preallocated irqs */
566 initcnt = arch_probe_nr_irqs();
567 printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
568 NR_IRQS, nr_irqs, initcnt);
570 if (WARN_ON(nr_irqs > MAX_SPARSE_IRQS))
571 nr_irqs = MAX_SPARSE_IRQS;
573 if (WARN_ON(initcnt > MAX_SPARSE_IRQS))
574 initcnt = MAX_SPARSE_IRQS;
576 if (initcnt > nr_irqs)
579 for (i = 0; i < initcnt; i++) {
580 desc = alloc_desc(i, node, 0, NULL, NULL);
581 irq_insert_desc(i, desc);
583 return arch_early_irq_init();
586 #else /* !CONFIG_SPARSE_IRQ */
588 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
589 [0 ... NR_IRQS-1] = {
590 .handle_irq = handle_bad_irq,
592 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
596 int __init early_irq_init(void)
598 int count, i, node = first_online_node;
601 init_irq_default_affinity();
603 printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
605 count = ARRAY_SIZE(irq_desc);
607 for (i = 0; i < count; i++) {
608 ret = init_desc(irq_desc + i, i, node, 0, NULL, NULL);
610 goto __free_desc_res;
613 return arch_early_irq_init();
617 free_masks(irq_desc + i);
618 free_percpu(irq_desc[i].kstat_irqs);
624 struct irq_desc *irq_to_desc(unsigned int irq)
626 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
628 EXPORT_SYMBOL(irq_to_desc);
630 static void free_desc(unsigned int irq)
632 struct irq_desc *desc = irq_to_desc(irq);
635 raw_spin_lock_irqsave(&desc->lock, flags);
636 desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
637 raw_spin_unlock_irqrestore(&desc->lock, flags);
638 delete_irq_desc(irq);
641 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
642 const struct irq_affinity_desc *affinity,
643 struct module *owner)
647 for (i = 0; i < cnt; i++) {
648 struct irq_desc *desc = irq_to_desc(start + i);
651 irq_insert_desc(start + i, desc);
656 static int irq_expand_nr_irqs(unsigned int nr)
661 void irq_mark_irq(unsigned int irq)
663 mutex_lock(&sparse_irq_lock);
664 irq_insert_desc(irq, irq_desc + irq);
665 mutex_unlock(&sparse_irq_lock);
668 #ifdef CONFIG_GENERIC_IRQ_LEGACY
669 void irq_init_desc(unsigned int irq)
675 #endif /* !CONFIG_SPARSE_IRQ */
677 int handle_irq_desc(struct irq_desc *desc)
679 struct irq_data *data;
684 data = irq_desc_get_irq_data(desc);
685 if (WARN_ON_ONCE(!in_hardirq() && handle_enforce_irqctx(data)))
688 generic_handle_irq_desc(desc);
693 * generic_handle_irq - Invoke the handler for a particular irq
694 * @irq: The irq number to handle
696 * Returns: 0 on success, or -EINVAL if conversion has failed
698 * This function must be called from an IRQ context with irq regs
701 int generic_handle_irq(unsigned int irq)
703 return handle_irq_desc(irq_to_desc(irq));
705 EXPORT_SYMBOL_GPL(generic_handle_irq);
708 * generic_handle_irq_safe - Invoke the handler for a particular irq from any
710 * @irq: The irq number to handle
712 * Returns: 0 on success, a negative value on error.
714 * This function can be called from any context (IRQ or process context). It
715 * will report an error if not invoked from IRQ context and the irq has been
716 * marked to enforce IRQ-context only.
718 int generic_handle_irq_safe(unsigned int irq)
723 local_irq_save(flags);
724 ret = handle_irq_desc(irq_to_desc(irq));
725 local_irq_restore(flags);
728 EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
730 #ifdef CONFIG_IRQ_DOMAIN
732 * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
734 * @domain: The domain where to perform the lookup
735 * @hwirq: The HW irq number to convert to a logical one
737 * Returns: 0 on success, or -EINVAL if conversion has failed
739 * This function must be called from an IRQ context with irq regs
742 int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
744 return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
746 EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
749 * generic_handle_irq_safe - Invoke the handler for a HW irq belonging
750 * to a domain from any context.
751 * @domain: The domain where to perform the lookup
752 * @hwirq: The HW irq number to convert to a logical one
754 * Returns: 0 on success, a negative value on error.
756 * This function can be called from any context (IRQ or process
757 * context). If the interrupt is marked as 'enforce IRQ-context only' then
758 * the function must be invoked from hard interrupt context.
760 int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq)
765 local_irq_save(flags);
766 ret = handle_irq_desc(irq_resolve_mapping(domain, hwirq));
767 local_irq_restore(flags);
770 EXPORT_SYMBOL_GPL(generic_handle_domain_irq_safe);
773 * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
775 * @domain: The domain where to perform the lookup
776 * @hwirq: The HW irq number to convert to a logical one
778 * Returns: 0 on success, or -EINVAL if conversion has failed
780 * This function must be called from an NMI context with irq regs
783 int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq)
785 WARN_ON_ONCE(!in_nmi());
786 return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
790 /* Dynamic interrupt handling */
793 * irq_free_descs - free irq descriptors
794 * @from: Start of descriptor range
795 * @cnt: Number of consecutive irqs to free
797 void irq_free_descs(unsigned int from, unsigned int cnt)
801 if (from >= nr_irqs || (from + cnt) > nr_irqs)
804 mutex_lock(&sparse_irq_lock);
805 for (i = 0; i < cnt; i++)
808 mutex_unlock(&sparse_irq_lock);
810 EXPORT_SYMBOL_GPL(irq_free_descs);
813 * __irq_alloc_descs - allocate and initialize a range of irq descriptors
814 * @irq: Allocate for specific irq number if irq >= 0
815 * @from: Start the search from this irq number
816 * @cnt: Number of consecutive irqs to allocate.
817 * @node: Preferred node on which the irq descriptor should be allocated
818 * @owner: Owning module (can be NULL)
819 * @affinity: Optional pointer to an affinity mask array of size @cnt which
820 * hints where the irq descriptors should be allocated and which
821 * default affinities to use
823 * Returns the first irq number or error code
826 __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
827 struct module *owner, const struct irq_affinity_desc *affinity)
840 * For interrupts which are freely allocated the
841 * architecture can force a lower bound to the @from
842 * argument. x86 uses this to exclude the GSI space.
844 from = arch_dynirq_lower_bound(from);
847 mutex_lock(&sparse_irq_lock);
849 start = irq_find_free_area(from, cnt);
851 if (irq >=0 && start != irq)
854 if (start + cnt > nr_irqs) {
855 ret = irq_expand_nr_irqs(start + cnt);
859 ret = alloc_descs(start, cnt, node, affinity, owner);
861 mutex_unlock(&sparse_irq_lock);
864 EXPORT_SYMBOL_GPL(__irq_alloc_descs);
867 * irq_get_next_irq - get next allocated irq number
868 * @offset: where to start the search
870 * Returns next irq number after offset or nr_irqs if none is found.
872 unsigned int irq_get_next_irq(unsigned int offset)
874 return irq_find_at_or_after(offset);
878 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
881 struct irq_desc *desc = irq_to_desc(irq);
884 if (check & _IRQ_DESC_CHECK) {
885 if ((check & _IRQ_DESC_PERCPU) &&
886 !irq_settings_is_per_cpu_devid(desc))
889 if (!(check & _IRQ_DESC_PERCPU) &&
890 irq_settings_is_per_cpu_devid(desc))
896 raw_spin_lock_irqsave(&desc->lock, *flags);
901 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
902 __releases(&desc->lock)
904 raw_spin_unlock_irqrestore(&desc->lock, flags);
906 chip_bus_sync_unlock(desc);
909 int irq_set_percpu_devid_partition(unsigned int irq,
910 const struct cpumask *affinity)
912 struct irq_desc *desc = irq_to_desc(irq);
917 if (desc->percpu_enabled)
920 desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
922 if (!desc->percpu_enabled)
926 desc->percpu_affinity = affinity;
928 desc->percpu_affinity = cpu_possible_mask;
930 irq_set_percpu_devid_flags(irq);
934 int irq_set_percpu_devid(unsigned int irq)
936 return irq_set_percpu_devid_partition(irq, NULL);
939 int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
941 struct irq_desc *desc = irq_to_desc(irq);
943 if (!desc || !desc->percpu_enabled)
947 cpumask_copy(affinity, desc->percpu_affinity);
951 EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
953 void kstat_incr_irq_this_cpu(unsigned int irq)
955 kstat_incr_irqs_this_cpu(irq_to_desc(irq));
959 * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
960 * @irq: The interrupt number
961 * @cpu: The cpu number
963 * Returns the sum of interrupt counts on @cpu since boot for
964 * @irq. The caller must ensure that the interrupt is not removed
967 unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
969 struct irq_desc *desc = irq_to_desc(irq);
971 return desc && desc->kstat_irqs ?
972 *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
975 static bool irq_is_nmi(struct irq_desc *desc)
977 return desc->istate & IRQS_NMI;
980 static unsigned int kstat_irqs(unsigned int irq)
982 struct irq_desc *desc = irq_to_desc(irq);
983 unsigned int sum = 0;
986 if (!desc || !desc->kstat_irqs)
988 if (!irq_settings_is_per_cpu_devid(desc) &&
989 !irq_settings_is_per_cpu(desc) &&
991 return data_race(desc->tot_count);
993 for_each_possible_cpu(cpu)
994 sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));
999 * kstat_irqs_usr - Get the statistics for an interrupt from thread context
1000 * @irq: The interrupt number
1002 * Returns the sum of interrupt counts on all cpus since boot for @irq.
1004 * It uses rcu to protect the access since a concurrent removal of an
1005 * interrupt descriptor is observing an rcu grace period before
1006 * delayed_free_desc()/irq_kobj_release().
1008 unsigned int kstat_irqs_usr(unsigned int irq)
1013 sum = kstat_irqs(irq);
1018 #ifdef CONFIG_LOCKDEP
1019 void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
1020 struct lock_class_key *request_class)
1022 struct irq_desc *desc = irq_to_desc(irq);
1025 lockdep_set_class(&desc->lock, lock_class);
1026 lockdep_set_class(&desc->request_mutex, request_class);
1029 EXPORT_SYMBOL_GPL(__irq_set_lockdep_class);