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/radix-tree.h>
16 #include <linux/bitmap.h>
17 #include <linux/irqdomain.h>
18 #include <linux/sysfs.h>
20 #include "internals.h"
23 * lockdep: we want to handle all irq_desc locks as a single lock-class:
25 static struct lock_class_key irq_desc_lock_class;
27 #if defined(CONFIG_SMP)
28 static int __init irq_affinity_setup(char *str)
30 alloc_bootmem_cpumask_var(&irq_default_affinity);
31 cpulist_parse(str, irq_default_affinity);
33 * Set at least the boot cpu. We don't want to end up with
34 * bugreports caused by random commandline masks
36 cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
39 __setup("irqaffinity=", irq_affinity_setup);
41 static void __init init_irq_default_affinity(void)
43 if (!cpumask_available(irq_default_affinity))
44 zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
45 if (cpumask_empty(irq_default_affinity))
46 cpumask_setall(irq_default_affinity);
49 static void __init init_irq_default_affinity(void)
55 static int alloc_masks(struct irq_desc *desc, int node)
57 if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,
61 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
62 if (!zalloc_cpumask_var_node(&desc->irq_common_data.effective_affinity,
64 free_cpumask_var(desc->irq_common_data.affinity);
69 #ifdef CONFIG_GENERIC_PENDING_IRQ
70 if (!zalloc_cpumask_var_node(&desc->pending_mask, GFP_KERNEL, node)) {
71 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
72 free_cpumask_var(desc->irq_common_data.effective_affinity);
74 free_cpumask_var(desc->irq_common_data.affinity);
81 static void desc_smp_init(struct irq_desc *desc, int node,
82 const struct cpumask *affinity)
85 affinity = irq_default_affinity;
86 cpumask_copy(desc->irq_common_data.affinity, affinity);
88 #ifdef CONFIG_GENERIC_PENDING_IRQ
89 cpumask_clear(desc->pending_mask);
92 desc->irq_common_data.node = node;
98 alloc_masks(struct irq_desc *desc, int node) { return 0; }
100 desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { }
103 static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
104 const struct cpumask *affinity, struct module *owner)
108 desc->irq_common_data.handler_data = NULL;
109 desc->irq_common_data.msi_desc = NULL;
111 desc->irq_data.common = &desc->irq_common_data;
112 desc->irq_data.irq = irq;
113 desc->irq_data.chip = &no_irq_chip;
114 desc->irq_data.chip_data = NULL;
115 irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
116 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
117 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
118 desc->handle_irq = handle_bad_irq;
121 desc->irqs_unhandled = 0;
125 for_each_possible_cpu(cpu)
126 *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
127 desc_smp_init(desc, node, affinity);
130 int nr_irqs = NR_IRQS;
131 EXPORT_SYMBOL_GPL(nr_irqs);
133 static DEFINE_MUTEX(sparse_irq_lock);
134 static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
136 #ifdef CONFIG_SPARSE_IRQ
138 static void irq_kobj_release(struct kobject *kobj);
141 static struct kobject *irq_kobj_base;
143 #define IRQ_ATTR_RO(_name) \
144 static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
146 static ssize_t per_cpu_count_show(struct kobject *kobj,
147 struct kobj_attribute *attr, char *buf)
149 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
154 for_each_possible_cpu(cpu) {
155 unsigned int c = irq_desc_kstat_cpu(desc, cpu);
157 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
161 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
164 IRQ_ATTR_RO(per_cpu_count);
166 static ssize_t chip_name_show(struct kobject *kobj,
167 struct kobj_attribute *attr, char *buf)
169 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
172 raw_spin_lock_irq(&desc->lock);
173 if (desc->irq_data.chip && desc->irq_data.chip->name) {
174 ret = scnprintf(buf, PAGE_SIZE, "%s\n",
175 desc->irq_data.chip->name);
177 raw_spin_unlock_irq(&desc->lock);
181 IRQ_ATTR_RO(chip_name);
183 static ssize_t hwirq_show(struct kobject *kobj,
184 struct kobj_attribute *attr, char *buf)
186 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
189 raw_spin_lock_irq(&desc->lock);
190 if (desc->irq_data.domain)
191 ret = sprintf(buf, "%lu\n", desc->irq_data.hwirq);
192 raw_spin_unlock_irq(&desc->lock);
198 static ssize_t type_show(struct kobject *kobj,
199 struct kobj_attribute *attr, char *buf)
201 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
204 raw_spin_lock_irq(&desc->lock);
205 ret = sprintf(buf, "%s\n",
206 irqd_is_level_type(&desc->irq_data) ? "level" : "edge");
207 raw_spin_unlock_irq(&desc->lock);
214 static ssize_t wakeup_show(struct kobject *kobj,
215 struct kobj_attribute *attr, char *buf)
217 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
220 raw_spin_lock_irq(&desc->lock);
221 ret = sprintf(buf, "%s\n",
222 irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled");
223 raw_spin_unlock_irq(&desc->lock);
230 static ssize_t name_show(struct kobject *kobj,
231 struct kobj_attribute *attr, char *buf)
233 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
236 raw_spin_lock_irq(&desc->lock);
238 ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);
239 raw_spin_unlock_irq(&desc->lock);
245 static ssize_t actions_show(struct kobject *kobj,
246 struct kobj_attribute *attr, char *buf)
248 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
249 struct irqaction *action;
253 raw_spin_lock_irq(&desc->lock);
254 for_each_action_of_desc(desc, action) {
255 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
259 raw_spin_unlock_irq(&desc->lock);
262 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
266 IRQ_ATTR_RO(actions);
268 static struct attribute *irq_attrs[] = {
269 &per_cpu_count_attr.attr,
270 &chip_name_attr.attr,
278 ATTRIBUTE_GROUPS(irq);
280 static struct kobj_type irq_kobj_type = {
281 .release = irq_kobj_release,
282 .sysfs_ops = &kobj_sysfs_ops,
283 .default_groups = irq_groups,
286 static void irq_sysfs_add(int irq, struct irq_desc *desc)
290 * Continue even in case of failure as this is nothing
293 if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
294 pr_warn("Failed to add kobject for irq %d\n", irq);
298 static void irq_sysfs_del(struct irq_desc *desc)
301 * If irq_sysfs_init() has not yet been invoked (early boot), then
302 * irq_kobj_base is NULL and the descriptor was never added.
303 * kobject_del() complains about a object with no parent, so make
307 kobject_del(&desc->kobj);
310 static int __init irq_sysfs_init(void)
312 struct irq_desc *desc;
315 /* Prevent concurrent irq alloc/free */
318 irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
319 if (!irq_kobj_base) {
324 /* Add the already allocated interrupts */
325 for_each_irq_desc(irq, desc)
326 irq_sysfs_add(irq, desc);
331 postcore_initcall(irq_sysfs_init);
333 #else /* !CONFIG_SYSFS */
335 static struct kobj_type irq_kobj_type = {
336 .release = irq_kobj_release,
339 static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
340 static void irq_sysfs_del(struct irq_desc *desc) {}
342 #endif /* CONFIG_SYSFS */
344 static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
346 static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
348 radix_tree_insert(&irq_desc_tree, irq, desc);
351 struct irq_desc *irq_to_desc(unsigned int irq)
353 return radix_tree_lookup(&irq_desc_tree, irq);
355 #ifdef CONFIG_KVM_BOOK3S_64_HV_MODULE
356 EXPORT_SYMBOL_GPL(irq_to_desc);
359 static void delete_irq_desc(unsigned int irq)
361 radix_tree_delete(&irq_desc_tree, irq);
365 static void free_masks(struct irq_desc *desc)
367 #ifdef CONFIG_GENERIC_PENDING_IRQ
368 free_cpumask_var(desc->pending_mask);
370 free_cpumask_var(desc->irq_common_data.affinity);
371 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
372 free_cpumask_var(desc->irq_common_data.effective_affinity);
376 static inline void free_masks(struct irq_desc *desc) { }
379 void irq_lock_sparse(void)
381 mutex_lock(&sparse_irq_lock);
384 void irq_unlock_sparse(void)
386 mutex_unlock(&sparse_irq_lock);
389 static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
390 const struct cpumask *affinity,
391 struct module *owner)
393 struct irq_desc *desc;
395 desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
398 /* allocate based on nr_cpu_ids */
399 desc->kstat_irqs = alloc_percpu(unsigned int);
400 if (!desc->kstat_irqs)
403 if (alloc_masks(desc, node))
406 raw_spin_lock_init(&desc->lock);
407 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
408 mutex_init(&desc->request_mutex);
409 init_rcu_head(&desc->rcu);
410 init_waitqueue_head(&desc->wait_for_threads);
412 desc_set_defaults(irq, desc, node, affinity, owner);
413 irqd_set(&desc->irq_data, flags);
414 kobject_init(&desc->kobj, &irq_kobj_type);
419 free_percpu(desc->kstat_irqs);
425 static void irq_kobj_release(struct kobject *kobj)
427 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
430 free_percpu(desc->kstat_irqs);
434 static void delayed_free_desc(struct rcu_head *rhp)
436 struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
438 kobject_put(&desc->kobj);
441 static void free_desc(unsigned int irq)
443 struct irq_desc *desc = irq_to_desc(irq);
445 irq_remove_debugfs_entry(desc);
446 unregister_irq_proc(irq, desc);
449 * sparse_irq_lock protects also show_interrupts() and
450 * kstat_irq_usr(). Once we deleted the descriptor from the
451 * sparse tree we can free it. Access in proc will fail to
452 * lookup the descriptor.
454 * The sysfs entry must be serialized against a concurrent
455 * irq_sysfs_init() as well.
458 delete_irq_desc(irq);
461 * We free the descriptor, masks and stat fields via RCU. That
462 * allows demultiplex interrupts to do rcu based management of
463 * the child interrupts.
464 * This also allows us to use rcu in kstat_irqs_usr().
466 call_rcu(&desc->rcu, delayed_free_desc);
469 static int alloc_descs(unsigned int start, unsigned int cnt, int node,
470 const struct irq_affinity_desc *affinity,
471 struct module *owner)
473 struct irq_desc *desc;
476 /* Validate affinity mask(s) */
478 for (i = 0; i < cnt; i++) {
479 if (cpumask_empty(&affinity[i].mask))
484 for (i = 0; i < cnt; i++) {
485 const struct cpumask *mask = NULL;
486 unsigned int flags = 0;
489 if (affinity->is_managed) {
490 flags = IRQD_AFFINITY_MANAGED |
491 IRQD_MANAGED_SHUTDOWN;
493 mask = &affinity->mask;
494 node = cpu_to_node(cpumask_first(mask));
498 desc = alloc_desc(start + i, node, flags, mask, owner);
501 irq_insert_desc(start + i, desc);
502 irq_sysfs_add(start + i, desc);
503 irq_add_debugfs_entry(start + i, desc);
505 bitmap_set(allocated_irqs, start, cnt);
509 for (i--; i >= 0; i--)
510 free_desc(start + i);
514 static int irq_expand_nr_irqs(unsigned int nr)
516 if (nr > IRQ_BITMAP_BITS)
522 int __init early_irq_init(void)
524 int i, initcnt, node = first_online_node;
525 struct irq_desc *desc;
527 init_irq_default_affinity();
529 /* Let arch update nr_irqs and return the nr of preallocated irqs */
530 initcnt = arch_probe_nr_irqs();
531 printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
532 NR_IRQS, nr_irqs, initcnt);
534 if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
535 nr_irqs = IRQ_BITMAP_BITS;
537 if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
538 initcnt = IRQ_BITMAP_BITS;
540 if (initcnt > nr_irqs)
543 for (i = 0; i < initcnt; i++) {
544 desc = alloc_desc(i, node, 0, NULL, NULL);
545 set_bit(i, allocated_irqs);
546 irq_insert_desc(i, desc);
548 return arch_early_irq_init();
551 #else /* !CONFIG_SPARSE_IRQ */
553 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
554 [0 ... NR_IRQS-1] = {
555 .handle_irq = handle_bad_irq,
557 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
561 int __init early_irq_init(void)
563 int count, i, node = first_online_node;
564 struct irq_desc *desc;
566 init_irq_default_affinity();
568 printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
571 count = ARRAY_SIZE(irq_desc);
573 for (i = 0; i < count; i++) {
574 desc[i].kstat_irqs = alloc_percpu(unsigned int);
575 alloc_masks(&desc[i], node);
576 raw_spin_lock_init(&desc[i].lock);
577 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
578 mutex_init(&desc[i].request_mutex);
579 init_waitqueue_head(&desc[i].wait_for_threads);
580 desc_set_defaults(i, &desc[i], node, NULL, NULL);
582 return arch_early_irq_init();
585 struct irq_desc *irq_to_desc(unsigned int irq)
587 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
589 EXPORT_SYMBOL(irq_to_desc);
591 static void free_desc(unsigned int irq)
593 struct irq_desc *desc = irq_to_desc(irq);
596 raw_spin_lock_irqsave(&desc->lock, flags);
597 desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
598 raw_spin_unlock_irqrestore(&desc->lock, flags);
601 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
602 const struct irq_affinity_desc *affinity,
603 struct module *owner)
607 for (i = 0; i < cnt; i++) {
608 struct irq_desc *desc = irq_to_desc(start + i);
612 bitmap_set(allocated_irqs, start, cnt);
616 static int irq_expand_nr_irqs(unsigned int nr)
621 void irq_mark_irq(unsigned int irq)
623 mutex_lock(&sparse_irq_lock);
624 bitmap_set(allocated_irqs, irq, 1);
625 mutex_unlock(&sparse_irq_lock);
628 #ifdef CONFIG_GENERIC_IRQ_LEGACY
629 void irq_init_desc(unsigned int irq)
635 #endif /* !CONFIG_SPARSE_IRQ */
637 int handle_irq_desc(struct irq_desc *desc)
639 struct irq_data *data;
644 data = irq_desc_get_irq_data(desc);
645 if (WARN_ON_ONCE(!in_hardirq() && handle_enforce_irqctx(data)))
648 generic_handle_irq_desc(desc);
653 * generic_handle_irq - Invoke the handler for a particular irq
654 * @irq: The irq number to handle
656 * Returns: 0 on success, or -EINVAL if conversion has failed
658 * This function must be called from an IRQ context with irq regs
661 int generic_handle_irq(unsigned int irq)
663 return handle_irq_desc(irq_to_desc(irq));
665 EXPORT_SYMBOL_GPL(generic_handle_irq);
668 * generic_handle_irq_safe - Invoke the handler for a particular irq from any
670 * @irq: The irq number to handle
672 * Returns: 0 on success, a negative value on error.
674 * This function can be called from any context (IRQ or process context). It
675 * will report an error if not invoked from IRQ context and the irq has been
676 * marked to enforce IRQ-context only.
678 int generic_handle_irq_safe(unsigned int irq)
683 local_irq_save(flags);
684 ret = handle_irq_desc(irq_to_desc(irq));
685 local_irq_restore(flags);
688 EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
690 #ifdef CONFIG_IRQ_DOMAIN
692 * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
694 * @domain: The domain where to perform the lookup
695 * @hwirq: The HW irq number to convert to a logical one
697 * Returns: 0 on success, or -EINVAL if conversion has failed
699 * This function must be called from an IRQ context with irq regs
702 int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
704 return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
706 EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
709 * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
711 * @domain: The domain where to perform the lookup
712 * @hwirq: The HW irq number to convert to a logical one
714 * Returns: 0 on success, or -EINVAL if conversion has failed
716 * This function must be called from an NMI context with irq regs
719 int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq)
721 WARN_ON_ONCE(!in_nmi());
722 return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
726 /* Dynamic interrupt handling */
729 * irq_free_descs - free irq descriptors
730 * @from: Start of descriptor range
731 * @cnt: Number of consecutive irqs to free
733 void irq_free_descs(unsigned int from, unsigned int cnt)
737 if (from >= nr_irqs || (from + cnt) > nr_irqs)
740 mutex_lock(&sparse_irq_lock);
741 for (i = 0; i < cnt; i++)
744 bitmap_clear(allocated_irqs, from, cnt);
745 mutex_unlock(&sparse_irq_lock);
747 EXPORT_SYMBOL_GPL(irq_free_descs);
750 * __irq_alloc_descs - allocate and initialize a range of irq descriptors
751 * @irq: Allocate for specific irq number if irq >= 0
752 * @from: Start the search from this irq number
753 * @cnt: Number of consecutive irqs to allocate.
754 * @node: Preferred node on which the irq descriptor should be allocated
755 * @owner: Owning module (can be NULL)
756 * @affinity: Optional pointer to an affinity mask array of size @cnt which
757 * hints where the irq descriptors should be allocated and which
758 * default affinities to use
760 * Returns the first irq number or error code
763 __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
764 struct module *owner, const struct irq_affinity_desc *affinity)
777 * For interrupts which are freely allocated the
778 * architecture can force a lower bound to the @from
779 * argument. x86 uses this to exclude the GSI space.
781 from = arch_dynirq_lower_bound(from);
784 mutex_lock(&sparse_irq_lock);
786 start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
789 if (irq >=0 && start != irq)
792 if (start + cnt > nr_irqs) {
793 ret = irq_expand_nr_irqs(start + cnt);
797 ret = alloc_descs(start, cnt, node, affinity, owner);
799 mutex_unlock(&sparse_irq_lock);
802 EXPORT_SYMBOL_GPL(__irq_alloc_descs);
805 * irq_get_next_irq - get next allocated irq number
806 * @offset: where to start the search
808 * Returns next irq number after offset or nr_irqs if none is found.
810 unsigned int irq_get_next_irq(unsigned int offset)
812 return find_next_bit(allocated_irqs, nr_irqs, offset);
816 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
819 struct irq_desc *desc = irq_to_desc(irq);
822 if (check & _IRQ_DESC_CHECK) {
823 if ((check & _IRQ_DESC_PERCPU) &&
824 !irq_settings_is_per_cpu_devid(desc))
827 if (!(check & _IRQ_DESC_PERCPU) &&
828 irq_settings_is_per_cpu_devid(desc))
834 raw_spin_lock_irqsave(&desc->lock, *flags);
839 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
840 __releases(&desc->lock)
842 raw_spin_unlock_irqrestore(&desc->lock, flags);
844 chip_bus_sync_unlock(desc);
847 int irq_set_percpu_devid_partition(unsigned int irq,
848 const struct cpumask *affinity)
850 struct irq_desc *desc = irq_to_desc(irq);
855 if (desc->percpu_enabled)
858 desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
860 if (!desc->percpu_enabled)
864 desc->percpu_affinity = affinity;
866 desc->percpu_affinity = cpu_possible_mask;
868 irq_set_percpu_devid_flags(irq);
872 int irq_set_percpu_devid(unsigned int irq)
874 return irq_set_percpu_devid_partition(irq, NULL);
877 int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
879 struct irq_desc *desc = irq_to_desc(irq);
881 if (!desc || !desc->percpu_enabled)
885 cpumask_copy(affinity, desc->percpu_affinity);
889 EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
891 void kstat_incr_irq_this_cpu(unsigned int irq)
893 kstat_incr_irqs_this_cpu(irq_to_desc(irq));
897 * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
898 * @irq: The interrupt number
899 * @cpu: The cpu number
901 * Returns the sum of interrupt counts on @cpu since boot for
902 * @irq. The caller must ensure that the interrupt is not removed
905 unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
907 struct irq_desc *desc = irq_to_desc(irq);
909 return desc && desc->kstat_irqs ?
910 *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
913 static bool irq_is_nmi(struct irq_desc *desc)
915 return desc->istate & IRQS_NMI;
918 static unsigned int kstat_irqs(unsigned int irq)
920 struct irq_desc *desc = irq_to_desc(irq);
921 unsigned int sum = 0;
924 if (!desc || !desc->kstat_irqs)
926 if (!irq_settings_is_per_cpu_devid(desc) &&
927 !irq_settings_is_per_cpu(desc) &&
929 return data_race(desc->tot_count);
931 for_each_possible_cpu(cpu)
932 sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));
937 * kstat_irqs_usr - Get the statistics for an interrupt from thread context
938 * @irq: The interrupt number
940 * Returns the sum of interrupt counts on all cpus since boot for @irq.
942 * It uses rcu to protect the access since a concurrent removal of an
943 * interrupt descriptor is observing an rcu grace period before
944 * delayed_free_desc()/irq_kobj_release().
946 unsigned int kstat_irqs_usr(unsigned int irq)
951 sum = kstat_irqs(irq);
956 #ifdef CONFIG_LOCKDEP
957 void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
958 struct lock_class_key *request_class)
960 struct irq_desc *desc = irq_to_desc(irq);
963 lockdep_set_class(&desc->lock, lock_class);
964 lockdep_set_class(&desc->request_mutex, request_class);
967 EXPORT_SYMBOL_GPL(__irq_set_lockdep_class);