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 comandline 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);
150 int cpu, irq = desc->irq_data.irq;
154 for_each_possible_cpu(cpu) {
155 unsigned int c = kstat_irqs_cpu(irq, 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, "%d\n", (int)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 (action = desc->action; action != NULL; action = action->next) {
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,
279 static struct kobj_type irq_kobj_type = {
280 .release = irq_kobj_release,
281 .sysfs_ops = &kobj_sysfs_ops,
282 .default_attrs = irq_attrs,
285 static void irq_sysfs_add(int irq, struct irq_desc *desc)
289 * Continue even in case of failure as this is nothing
292 if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
293 pr_warn("Failed to add kobject for irq %d\n", irq);
297 static int __init irq_sysfs_init(void)
299 struct irq_desc *desc;
302 /* Prevent concurrent irq alloc/free */
305 irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
306 if (!irq_kobj_base) {
311 /* Add the already allocated interrupts */
312 for_each_irq_desc(irq, desc)
313 irq_sysfs_add(irq, desc);
318 postcore_initcall(irq_sysfs_init);
320 #else /* !CONFIG_SYSFS */
322 static struct kobj_type irq_kobj_type = {
323 .release = irq_kobj_release,
326 static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
328 #endif /* CONFIG_SYSFS */
330 static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
332 static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
334 radix_tree_insert(&irq_desc_tree, irq, desc);
337 struct irq_desc *irq_to_desc(unsigned int irq)
339 return radix_tree_lookup(&irq_desc_tree, irq);
341 EXPORT_SYMBOL(irq_to_desc);
343 static void delete_irq_desc(unsigned int irq)
345 radix_tree_delete(&irq_desc_tree, irq);
349 static void free_masks(struct irq_desc *desc)
351 #ifdef CONFIG_GENERIC_PENDING_IRQ
352 free_cpumask_var(desc->pending_mask);
354 free_cpumask_var(desc->irq_common_data.affinity);
355 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
356 free_cpumask_var(desc->irq_common_data.effective_affinity);
360 static inline void free_masks(struct irq_desc *desc) { }
363 void irq_lock_sparse(void)
365 mutex_lock(&sparse_irq_lock);
368 void irq_unlock_sparse(void)
370 mutex_unlock(&sparse_irq_lock);
373 static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
374 const struct cpumask *affinity,
375 struct module *owner)
377 struct irq_desc *desc;
379 desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
382 /* allocate based on nr_cpu_ids */
383 desc->kstat_irqs = alloc_percpu(unsigned int);
384 if (!desc->kstat_irqs)
387 if (alloc_masks(desc, node))
390 raw_spin_lock_init(&desc->lock);
391 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
392 mutex_init(&desc->request_mutex);
393 init_rcu_head(&desc->rcu);
395 desc_set_defaults(irq, desc, node, affinity, owner);
396 irqd_set(&desc->irq_data, flags);
397 kobject_init(&desc->kobj, &irq_kobj_type);
402 free_percpu(desc->kstat_irqs);
408 static void irq_kobj_release(struct kobject *kobj)
410 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
413 free_percpu(desc->kstat_irqs);
417 static void delayed_free_desc(struct rcu_head *rhp)
419 struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
421 kobject_put(&desc->kobj);
424 static void free_desc(unsigned int irq)
426 struct irq_desc *desc = irq_to_desc(irq);
428 irq_remove_debugfs_entry(desc);
429 unregister_irq_proc(irq, desc);
432 * sparse_irq_lock protects also show_interrupts() and
433 * kstat_irq_usr(). Once we deleted the descriptor from the
434 * sparse tree we can free it. Access in proc will fail to
435 * lookup the descriptor.
437 * The sysfs entry must be serialized against a concurrent
438 * irq_sysfs_init() as well.
440 kobject_del(&desc->kobj);
441 delete_irq_desc(irq);
444 * We free the descriptor, masks and stat fields via RCU. That
445 * allows demultiplex interrupts to do rcu based management of
446 * the child interrupts.
447 * This also allows us to use rcu in kstat_irqs_usr().
449 call_rcu(&desc->rcu, delayed_free_desc);
452 static int alloc_descs(unsigned int start, unsigned int cnt, int node,
453 const struct irq_affinity_desc *affinity,
454 struct module *owner)
456 struct irq_desc *desc;
459 /* Validate affinity mask(s) */
461 for (i = 0; i < cnt; i++) {
462 if (cpumask_empty(&affinity[i].mask))
467 for (i = 0; i < cnt; i++) {
468 const struct cpumask *mask = NULL;
469 unsigned int flags = 0;
472 if (affinity->is_managed) {
473 flags = IRQD_AFFINITY_MANAGED |
474 IRQD_MANAGED_SHUTDOWN;
476 mask = &affinity->mask;
477 node = cpu_to_node(cpumask_first(mask));
481 desc = alloc_desc(start + i, node, flags, mask, owner);
484 irq_insert_desc(start + i, desc);
485 irq_sysfs_add(start + i, desc);
486 irq_add_debugfs_entry(start + i, desc);
488 bitmap_set(allocated_irqs, start, cnt);
492 for (i--; i >= 0; i--)
493 free_desc(start + i);
497 static int irq_expand_nr_irqs(unsigned int nr)
499 if (nr > IRQ_BITMAP_BITS)
505 int __init early_irq_init(void)
507 int i, initcnt, node = first_online_node;
508 struct irq_desc *desc;
510 init_irq_default_affinity();
512 /* Let arch update nr_irqs and return the nr of preallocated irqs */
513 initcnt = arch_probe_nr_irqs();
514 printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
515 NR_IRQS, nr_irqs, initcnt);
517 if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
518 nr_irqs = IRQ_BITMAP_BITS;
520 if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
521 initcnt = IRQ_BITMAP_BITS;
523 if (initcnt > nr_irqs)
526 for (i = 0; i < initcnt; i++) {
527 desc = alloc_desc(i, node, 0, NULL, NULL);
528 set_bit(i, allocated_irqs);
529 irq_insert_desc(i, desc);
531 return arch_early_irq_init();
534 #else /* !CONFIG_SPARSE_IRQ */
536 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
537 [0 ... NR_IRQS-1] = {
538 .handle_irq = handle_bad_irq,
540 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
544 int __init early_irq_init(void)
546 int count, i, node = first_online_node;
547 struct irq_desc *desc;
549 init_irq_default_affinity();
551 printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
554 count = ARRAY_SIZE(irq_desc);
556 for (i = 0; i < count; i++) {
557 desc[i].kstat_irqs = alloc_percpu(unsigned int);
558 alloc_masks(&desc[i], node);
559 raw_spin_lock_init(&desc[i].lock);
560 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
561 desc_set_defaults(i, &desc[i], node, NULL, NULL);
563 return arch_early_irq_init();
566 struct irq_desc *irq_to_desc(unsigned int irq)
568 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
570 EXPORT_SYMBOL(irq_to_desc);
572 static void free_desc(unsigned int irq)
574 struct irq_desc *desc = irq_to_desc(irq);
577 raw_spin_lock_irqsave(&desc->lock, flags);
578 desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
579 raw_spin_unlock_irqrestore(&desc->lock, flags);
582 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
583 const struct irq_affinity_desc *affinity,
584 struct module *owner)
588 for (i = 0; i < cnt; i++) {
589 struct irq_desc *desc = irq_to_desc(start + i);
593 bitmap_set(allocated_irqs, start, cnt);
597 static int irq_expand_nr_irqs(unsigned int nr)
602 void irq_mark_irq(unsigned int irq)
604 mutex_lock(&sparse_irq_lock);
605 bitmap_set(allocated_irqs, irq, 1);
606 mutex_unlock(&sparse_irq_lock);
609 #ifdef CONFIG_GENERIC_IRQ_LEGACY
610 void irq_init_desc(unsigned int irq)
616 #endif /* !CONFIG_SPARSE_IRQ */
619 * generic_handle_irq - Invoke the handler for a particular irq
620 * @irq: The irq number to handle
623 int generic_handle_irq(unsigned int irq)
625 struct irq_desc *desc = irq_to_desc(irq);
629 generic_handle_irq_desc(desc);
632 EXPORT_SYMBOL_GPL(generic_handle_irq);
634 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
636 * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain
637 * @domain: The domain where to perform the lookup
638 * @hwirq: The HW irq number to convert to a logical one
639 * @lookup: Whether to perform the domain lookup or not
640 * @regs: Register file coming from the low-level handling code
642 * Returns: 0 on success, or -EINVAL if conversion has failed
644 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
645 bool lookup, struct pt_regs *regs)
647 struct pt_regs *old_regs = set_irq_regs(regs);
648 unsigned int irq = hwirq;
653 #ifdef CONFIG_IRQ_DOMAIN
655 irq = irq_find_mapping(domain, hwirq);
659 * Some hardware gives randomly wrong interrupts. Rather
660 * than crashing, do something sensible.
662 if (unlikely(!irq || irq >= nr_irqs)) {
666 generic_handle_irq(irq);
670 set_irq_regs(old_regs);
674 #ifdef CONFIG_IRQ_DOMAIN
676 * handle_domain_nmi - Invoke the handler for a HW irq belonging to a domain
677 * @domain: The domain where to perform the lookup
678 * @hwirq: The HW irq number to convert to a logical one
679 * @regs: Register file coming from the low-level handling code
681 * Returns: 0 on success, or -EINVAL if conversion has failed
683 int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq,
684 struct pt_regs *regs)
686 struct pt_regs *old_regs = set_irq_regs(regs);
692 irq = irq_find_mapping(domain, hwirq);
695 * ack_bad_irq is not NMI-safe, just report
696 * an invalid interrupt.
699 generic_handle_irq(irq);
704 set_irq_regs(old_regs);
710 /* Dynamic interrupt handling */
713 * irq_free_descs - free irq descriptors
714 * @from: Start of descriptor range
715 * @cnt: Number of consecutive irqs to free
717 void irq_free_descs(unsigned int from, unsigned int cnt)
721 if (from >= nr_irqs || (from + cnt) > nr_irqs)
724 mutex_lock(&sparse_irq_lock);
725 for (i = 0; i < cnt; i++)
728 bitmap_clear(allocated_irqs, from, cnt);
729 mutex_unlock(&sparse_irq_lock);
731 EXPORT_SYMBOL_GPL(irq_free_descs);
734 * irq_alloc_descs - allocate and initialize a range of irq descriptors
735 * @irq: Allocate for specific irq number if irq >= 0
736 * @from: Start the search from this irq number
737 * @cnt: Number of consecutive irqs to allocate.
738 * @node: Preferred node on which the irq descriptor should be allocated
739 * @owner: Owning module (can be NULL)
740 * @affinity: Optional pointer to an affinity mask array of size @cnt which
741 * hints where the irq descriptors should be allocated and which
742 * default affinities to use
744 * Returns the first irq number or error code
747 __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
748 struct module *owner, const struct irq_affinity_desc *affinity)
761 * For interrupts which are freely allocated the
762 * architecture can force a lower bound to the @from
763 * argument. x86 uses this to exclude the GSI space.
765 from = arch_dynirq_lower_bound(from);
768 mutex_lock(&sparse_irq_lock);
770 start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
773 if (irq >=0 && start != irq)
776 if (start + cnt > nr_irqs) {
777 ret = irq_expand_nr_irqs(start + cnt);
781 ret = alloc_descs(start, cnt, node, affinity, owner);
783 mutex_unlock(&sparse_irq_lock);
786 EXPORT_SYMBOL_GPL(__irq_alloc_descs);
788 #ifdef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
790 * irq_alloc_hwirqs - Allocate an irq descriptor and initialize the hardware
791 * @cnt: number of interrupts to allocate
792 * @node: node on which to allocate
794 * Returns an interrupt number > 0 or 0, if the allocation fails.
796 unsigned int irq_alloc_hwirqs(int cnt, int node)
798 int i, irq = __irq_alloc_descs(-1, 0, cnt, node, NULL, NULL);
803 for (i = irq; cnt > 0; i++, cnt--) {
804 if (arch_setup_hwirq(i, node))
806 irq_clear_status_flags(i, _IRQ_NOREQUEST);
811 for (i--; i >= irq; i--) {
812 irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
813 arch_teardown_hwirq(i);
815 irq_free_descs(irq, cnt);
818 EXPORT_SYMBOL_GPL(irq_alloc_hwirqs);
821 * irq_free_hwirqs - Free irq descriptor and cleanup the hardware
822 * @from: Free from irq number
823 * @cnt: number of interrupts to free
826 void irq_free_hwirqs(unsigned int from, int cnt)
830 for (i = from, j = cnt; j > 0; i++, j--) {
831 irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
832 arch_teardown_hwirq(i);
834 irq_free_descs(from, cnt);
836 EXPORT_SYMBOL_GPL(irq_free_hwirqs);
840 * irq_get_next_irq - get next allocated irq number
841 * @offset: where to start the search
843 * Returns next irq number after offset or nr_irqs if none is found.
845 unsigned int irq_get_next_irq(unsigned int offset)
847 return find_next_bit(allocated_irqs, nr_irqs, offset);
851 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
854 struct irq_desc *desc = irq_to_desc(irq);
857 if (check & _IRQ_DESC_CHECK) {
858 if ((check & _IRQ_DESC_PERCPU) &&
859 !irq_settings_is_per_cpu_devid(desc))
862 if (!(check & _IRQ_DESC_PERCPU) &&
863 irq_settings_is_per_cpu_devid(desc))
869 raw_spin_lock_irqsave(&desc->lock, *flags);
874 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
876 raw_spin_unlock_irqrestore(&desc->lock, flags);
878 chip_bus_sync_unlock(desc);
881 int irq_set_percpu_devid_partition(unsigned int irq,
882 const struct cpumask *affinity)
884 struct irq_desc *desc = irq_to_desc(irq);
889 if (desc->percpu_enabled)
892 desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
894 if (!desc->percpu_enabled)
898 desc->percpu_affinity = affinity;
900 desc->percpu_affinity = cpu_possible_mask;
902 irq_set_percpu_devid_flags(irq);
906 int irq_set_percpu_devid(unsigned int irq)
908 return irq_set_percpu_devid_partition(irq, NULL);
911 int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
913 struct irq_desc *desc = irq_to_desc(irq);
915 if (!desc || !desc->percpu_enabled)
919 cpumask_copy(affinity, desc->percpu_affinity);
923 EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
925 void kstat_incr_irq_this_cpu(unsigned int irq)
927 kstat_incr_irqs_this_cpu(irq_to_desc(irq));
931 * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
932 * @irq: The interrupt number
933 * @cpu: The cpu number
935 * Returns the sum of interrupt counts on @cpu since boot for
936 * @irq. The caller must ensure that the interrupt is not removed
939 unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
941 struct irq_desc *desc = irq_to_desc(irq);
943 return desc && desc->kstat_irqs ?
944 *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
948 * kstat_irqs - Get the statistics for an interrupt
949 * @irq: The interrupt number
951 * Returns the sum of interrupt counts on all cpus since boot for
952 * @irq. The caller must ensure that the interrupt is not removed
955 unsigned int kstat_irqs(unsigned int irq)
957 struct irq_desc *desc = irq_to_desc(irq);
958 unsigned int sum = 0;
961 if (!desc || !desc->kstat_irqs)
963 if (!irq_settings_is_per_cpu_devid(desc) &&
964 !irq_settings_is_per_cpu(desc))
965 return desc->tot_count;
967 for_each_possible_cpu(cpu)
968 sum += *per_cpu_ptr(desc->kstat_irqs, cpu);
973 * kstat_irqs_usr - Get the statistics for an interrupt
974 * @irq: The interrupt number
976 * Returns the sum of interrupt counts on all cpus since boot for @irq.
977 * Contrary to kstat_irqs() this can be called from any context.
978 * It uses rcu since a concurrent removal of an interrupt descriptor is
979 * observing an rcu grace period before delayed_free_desc()/irq_kobj_release().
981 unsigned int kstat_irqs_usr(unsigned int irq)
986 sum = kstat_irqs(irq);