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;
97 alloc_masks(struct irq_desc *desc, int node) { return 0; }
99 desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { }
102 static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
103 const struct cpumask *affinity, struct module *owner)
107 desc->irq_common_data.handler_data = NULL;
108 desc->irq_common_data.msi_desc = NULL;
110 desc->irq_data.common = &desc->irq_common_data;
111 desc->irq_data.irq = irq;
112 desc->irq_data.chip = &no_irq_chip;
113 desc->irq_data.chip_data = NULL;
114 irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
115 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
116 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
117 desc->handle_irq = handle_bad_irq;
120 desc->irqs_unhandled = 0;
124 for_each_possible_cpu(cpu)
125 *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
126 desc_smp_init(desc, node, affinity);
129 int nr_irqs = NR_IRQS;
130 EXPORT_SYMBOL_GPL(nr_irqs);
132 static DEFINE_MUTEX(sparse_irq_lock);
133 static struct maple_tree sparse_irqs = MTREE_INIT_EXT(sparse_irqs,
134 MT_FLAGS_ALLOC_RANGE |
135 MT_FLAGS_LOCK_EXTERN |
139 static int irq_find_free_area(unsigned int from, unsigned int cnt)
141 MA_STATE(mas, &sparse_irqs, 0, 0);
143 if (mas_empty_area(&mas, from, MAX_SPARSE_IRQS, cnt))
148 static unsigned int irq_find_at_or_after(unsigned int offset)
150 unsigned long index = offset;
151 struct irq_desc *desc = mt_find(&sparse_irqs, &index, nr_irqs);
153 return desc ? irq_desc_get_irq(desc) : nr_irqs;
156 static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
158 MA_STATE(mas, &sparse_irqs, irq, irq);
159 WARN_ON(mas_store_gfp(&mas, desc, GFP_KERNEL) != 0);
162 static void delete_irq_desc(unsigned int irq)
164 MA_STATE(mas, &sparse_irqs, irq, irq);
168 #ifdef CONFIG_SPARSE_IRQ
170 static void irq_kobj_release(struct kobject *kobj);
173 static struct kobject *irq_kobj_base;
175 #define IRQ_ATTR_RO(_name) \
176 static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
178 static ssize_t per_cpu_count_show(struct kobject *kobj,
179 struct kobj_attribute *attr, char *buf)
181 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
186 for_each_possible_cpu(cpu) {
187 unsigned int c = irq_desc_kstat_cpu(desc, cpu);
189 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
193 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
196 IRQ_ATTR_RO(per_cpu_count);
198 static ssize_t chip_name_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 if (desc->irq_data.chip && desc->irq_data.chip->name) {
206 ret = scnprintf(buf, PAGE_SIZE, "%s\n",
207 desc->irq_data.chip->name);
209 raw_spin_unlock_irq(&desc->lock);
213 IRQ_ATTR_RO(chip_name);
215 static ssize_t hwirq_show(struct kobject *kobj,
216 struct kobj_attribute *attr, char *buf)
218 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
221 raw_spin_lock_irq(&desc->lock);
222 if (desc->irq_data.domain)
223 ret = sprintf(buf, "%lu\n", desc->irq_data.hwirq);
224 raw_spin_unlock_irq(&desc->lock);
230 static ssize_t type_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);
237 ret = sprintf(buf, "%s\n",
238 irqd_is_level_type(&desc->irq_data) ? "level" : "edge");
239 raw_spin_unlock_irq(&desc->lock);
246 static ssize_t wakeup_show(struct kobject *kobj,
247 struct kobj_attribute *attr, char *buf)
249 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
252 raw_spin_lock_irq(&desc->lock);
253 ret = sprintf(buf, "%s\n",
254 irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled");
255 raw_spin_unlock_irq(&desc->lock);
262 static ssize_t name_show(struct kobject *kobj,
263 struct kobj_attribute *attr, char *buf)
265 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
268 raw_spin_lock_irq(&desc->lock);
270 ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);
271 raw_spin_unlock_irq(&desc->lock);
277 static ssize_t actions_show(struct kobject *kobj,
278 struct kobj_attribute *attr, char *buf)
280 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
281 struct irqaction *action;
285 raw_spin_lock_irq(&desc->lock);
286 for_each_action_of_desc(desc, action) {
287 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
291 raw_spin_unlock_irq(&desc->lock);
294 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
298 IRQ_ATTR_RO(actions);
300 static struct attribute *irq_attrs[] = {
301 &per_cpu_count_attr.attr,
302 &chip_name_attr.attr,
310 ATTRIBUTE_GROUPS(irq);
312 static const struct kobj_type irq_kobj_type = {
313 .release = irq_kobj_release,
314 .sysfs_ops = &kobj_sysfs_ops,
315 .default_groups = irq_groups,
318 static void irq_sysfs_add(int irq, struct irq_desc *desc)
322 * Continue even in case of failure as this is nothing
323 * crucial and failures in the late irq_sysfs_init()
324 * cannot be rolled back.
326 if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
327 pr_warn("Failed to add kobject for irq %d\n", irq);
329 desc->istate |= IRQS_SYSFS;
333 static void irq_sysfs_del(struct irq_desc *desc)
336 * Only invoke kobject_del() when kobject_add() was successfully
337 * invoked for the descriptor. This covers both early boot, where
338 * sysfs is not initialized yet, and the case of a failed
339 * kobject_add() invocation.
341 if (desc->istate & IRQS_SYSFS)
342 kobject_del(&desc->kobj);
345 static int __init irq_sysfs_init(void)
347 struct irq_desc *desc;
350 /* Prevent concurrent irq alloc/free */
353 irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
354 if (!irq_kobj_base) {
359 /* Add the already allocated interrupts */
360 for_each_irq_desc(irq, desc)
361 irq_sysfs_add(irq, desc);
366 postcore_initcall(irq_sysfs_init);
368 #else /* !CONFIG_SYSFS */
370 static const struct kobj_type irq_kobj_type = {
371 .release = irq_kobj_release,
374 static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
375 static void irq_sysfs_del(struct irq_desc *desc) {}
377 #endif /* CONFIG_SYSFS */
379 struct irq_desc *irq_to_desc(unsigned int irq)
381 return mtree_load(&sparse_irqs, irq);
383 #ifdef CONFIG_KVM_BOOK3S_64_HV_MODULE
384 EXPORT_SYMBOL_GPL(irq_to_desc);
388 static void free_masks(struct irq_desc *desc)
390 #ifdef CONFIG_GENERIC_PENDING_IRQ
391 free_cpumask_var(desc->pending_mask);
393 free_cpumask_var(desc->irq_common_data.affinity);
394 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
395 free_cpumask_var(desc->irq_common_data.effective_affinity);
399 static inline void free_masks(struct irq_desc *desc) { }
402 void irq_lock_sparse(void)
404 mutex_lock(&sparse_irq_lock);
407 void irq_unlock_sparse(void)
409 mutex_unlock(&sparse_irq_lock);
412 static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
413 const struct cpumask *affinity,
414 struct module *owner)
416 struct irq_desc *desc;
418 desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
421 /* allocate based on nr_cpu_ids */
422 desc->kstat_irqs = alloc_percpu(unsigned int);
423 if (!desc->kstat_irqs)
426 if (alloc_masks(desc, node))
429 raw_spin_lock_init(&desc->lock);
430 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
431 mutex_init(&desc->request_mutex);
432 init_rcu_head(&desc->rcu);
433 init_waitqueue_head(&desc->wait_for_threads);
435 desc_set_defaults(irq, desc, node, affinity, owner);
436 irqd_set(&desc->irq_data, flags);
437 kobject_init(&desc->kobj, &irq_kobj_type);
438 irq_resend_init(desc);
443 free_percpu(desc->kstat_irqs);
449 static void irq_kobj_release(struct kobject *kobj)
451 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
454 free_percpu(desc->kstat_irqs);
458 static void delayed_free_desc(struct rcu_head *rhp)
460 struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
462 kobject_put(&desc->kobj);
465 static void free_desc(unsigned int irq)
467 struct irq_desc *desc = irq_to_desc(irq);
469 irq_remove_debugfs_entry(desc);
470 unregister_irq_proc(irq, desc);
473 * sparse_irq_lock protects also show_interrupts() and
474 * kstat_irq_usr(). Once we deleted the descriptor from the
475 * sparse tree we can free it. Access in proc will fail to
476 * lookup the descriptor.
478 * The sysfs entry must be serialized against a concurrent
479 * irq_sysfs_init() as well.
482 delete_irq_desc(irq);
485 * We free the descriptor, masks and stat fields via RCU. That
486 * allows demultiplex interrupts to do rcu based management of
487 * the child interrupts.
488 * This also allows us to use rcu in kstat_irqs_usr().
490 call_rcu(&desc->rcu, delayed_free_desc);
493 static int alloc_descs(unsigned int start, unsigned int cnt, int node,
494 const struct irq_affinity_desc *affinity,
495 struct module *owner)
497 struct irq_desc *desc;
500 /* Validate affinity mask(s) */
502 for (i = 0; i < cnt; i++) {
503 if (cpumask_empty(&affinity[i].mask))
508 for (i = 0; i < cnt; i++) {
509 const struct cpumask *mask = NULL;
510 unsigned int flags = 0;
513 if (affinity->is_managed) {
514 flags = IRQD_AFFINITY_MANAGED |
515 IRQD_MANAGED_SHUTDOWN;
517 mask = &affinity->mask;
518 node = cpu_to_node(cpumask_first(mask));
522 desc = alloc_desc(start + i, node, flags, mask, owner);
525 irq_insert_desc(start + i, desc);
526 irq_sysfs_add(start + i, desc);
527 irq_add_debugfs_entry(start + i, desc);
532 for (i--; i >= 0; i--)
533 free_desc(start + i);
537 static int irq_expand_nr_irqs(unsigned int nr)
539 if (nr > MAX_SPARSE_IRQS)
545 int __init early_irq_init(void)
547 int i, initcnt, node = first_online_node;
548 struct irq_desc *desc;
550 init_irq_default_affinity();
552 /* Let arch update nr_irqs and return the nr of preallocated irqs */
553 initcnt = arch_probe_nr_irqs();
554 printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
555 NR_IRQS, nr_irqs, initcnt);
557 if (WARN_ON(nr_irqs > MAX_SPARSE_IRQS))
558 nr_irqs = MAX_SPARSE_IRQS;
560 if (WARN_ON(initcnt > MAX_SPARSE_IRQS))
561 initcnt = MAX_SPARSE_IRQS;
563 if (initcnt > nr_irqs)
566 for (i = 0; i < initcnt; i++) {
567 desc = alloc_desc(i, node, 0, NULL, NULL);
568 irq_insert_desc(i, desc);
570 return arch_early_irq_init();
573 #else /* !CONFIG_SPARSE_IRQ */
575 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
576 [0 ... NR_IRQS-1] = {
577 .handle_irq = handle_bad_irq,
579 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
583 int __init early_irq_init(void)
585 int count, i, node = first_online_node;
586 struct irq_desc *desc;
588 init_irq_default_affinity();
590 printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
593 count = ARRAY_SIZE(irq_desc);
595 for (i = 0; i < count; i++) {
596 desc[i].kstat_irqs = alloc_percpu(unsigned int);
597 alloc_masks(&desc[i], node);
598 raw_spin_lock_init(&desc[i].lock);
599 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
600 mutex_init(&desc[i].request_mutex);
601 init_waitqueue_head(&desc[i].wait_for_threads);
602 desc_set_defaults(i, &desc[i], node, NULL, NULL);
603 irq_resend_init(desc);
605 return arch_early_irq_init();
608 struct irq_desc *irq_to_desc(unsigned int irq)
610 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
612 EXPORT_SYMBOL(irq_to_desc);
614 static void free_desc(unsigned int irq)
616 struct irq_desc *desc = irq_to_desc(irq);
619 raw_spin_lock_irqsave(&desc->lock, flags);
620 desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
621 raw_spin_unlock_irqrestore(&desc->lock, flags);
622 delete_irq_desc(irq);
625 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
626 const struct irq_affinity_desc *affinity,
627 struct module *owner)
631 for (i = 0; i < cnt; i++) {
632 struct irq_desc *desc = irq_to_desc(start + i);
635 irq_insert_desc(start + i, desc);
640 static int irq_expand_nr_irqs(unsigned int nr)
645 void irq_mark_irq(unsigned int irq)
647 mutex_lock(&sparse_irq_lock);
648 irq_insert_desc(irq, irq_desc + irq);
649 mutex_unlock(&sparse_irq_lock);
652 #ifdef CONFIG_GENERIC_IRQ_LEGACY
653 void irq_init_desc(unsigned int irq)
659 #endif /* !CONFIG_SPARSE_IRQ */
661 int handle_irq_desc(struct irq_desc *desc)
663 struct irq_data *data;
668 data = irq_desc_get_irq_data(desc);
669 if (WARN_ON_ONCE(!in_hardirq() && handle_enforce_irqctx(data)))
672 generic_handle_irq_desc(desc);
677 * generic_handle_irq - Invoke the handler for a particular irq
678 * @irq: The irq number to handle
680 * Returns: 0 on success, or -EINVAL if conversion has failed
682 * This function must be called from an IRQ context with irq regs
685 int generic_handle_irq(unsigned int irq)
687 return handle_irq_desc(irq_to_desc(irq));
689 EXPORT_SYMBOL_GPL(generic_handle_irq);
692 * generic_handle_irq_safe - Invoke the handler for a particular irq from any
694 * @irq: The irq number to handle
696 * Returns: 0 on success, a negative value on error.
698 * This function can be called from any context (IRQ or process context). It
699 * will report an error if not invoked from IRQ context and the irq has been
700 * marked to enforce IRQ-context only.
702 int generic_handle_irq_safe(unsigned int irq)
707 local_irq_save(flags);
708 ret = handle_irq_desc(irq_to_desc(irq));
709 local_irq_restore(flags);
712 EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
714 #ifdef CONFIG_IRQ_DOMAIN
716 * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
718 * @domain: The domain where to perform the lookup
719 * @hwirq: The HW irq number to convert to a logical one
721 * Returns: 0 on success, or -EINVAL if conversion has failed
723 * This function must be called from an IRQ context with irq regs
726 int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
728 return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
730 EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
733 * generic_handle_irq_safe - Invoke the handler for a HW irq belonging
734 * to a domain from any context.
735 * @domain: The domain where to perform the lookup
736 * @hwirq: The HW irq number to convert to a logical one
738 * Returns: 0 on success, a negative value on error.
740 * This function can be called from any context (IRQ or process
741 * context). If the interrupt is marked as 'enforce IRQ-context only' then
742 * the function must be invoked from hard interrupt context.
744 int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq)
749 local_irq_save(flags);
750 ret = handle_irq_desc(irq_resolve_mapping(domain, hwirq));
751 local_irq_restore(flags);
754 EXPORT_SYMBOL_GPL(generic_handle_domain_irq_safe);
757 * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
759 * @domain: The domain where to perform the lookup
760 * @hwirq: The HW irq number to convert to a logical one
762 * Returns: 0 on success, or -EINVAL if conversion has failed
764 * This function must be called from an NMI context with irq regs
767 int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq)
769 WARN_ON_ONCE(!in_nmi());
770 return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
774 /* Dynamic interrupt handling */
777 * irq_free_descs - free irq descriptors
778 * @from: Start of descriptor range
779 * @cnt: Number of consecutive irqs to free
781 void irq_free_descs(unsigned int from, unsigned int cnt)
785 if (from >= nr_irqs || (from + cnt) > nr_irqs)
788 mutex_lock(&sparse_irq_lock);
789 for (i = 0; i < cnt; i++)
792 mutex_unlock(&sparse_irq_lock);
794 EXPORT_SYMBOL_GPL(irq_free_descs);
797 * __irq_alloc_descs - allocate and initialize a range of irq descriptors
798 * @irq: Allocate for specific irq number if irq >= 0
799 * @from: Start the search from this irq number
800 * @cnt: Number of consecutive irqs to allocate.
801 * @node: Preferred node on which the irq descriptor should be allocated
802 * @owner: Owning module (can be NULL)
803 * @affinity: Optional pointer to an affinity mask array of size @cnt which
804 * hints where the irq descriptors should be allocated and which
805 * default affinities to use
807 * Returns the first irq number or error code
810 __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
811 struct module *owner, const struct irq_affinity_desc *affinity)
824 * For interrupts which are freely allocated the
825 * architecture can force a lower bound to the @from
826 * argument. x86 uses this to exclude the GSI space.
828 from = arch_dynirq_lower_bound(from);
831 mutex_lock(&sparse_irq_lock);
833 start = irq_find_free_area(from, cnt);
835 if (irq >=0 && start != irq)
838 if (start + cnt > nr_irqs) {
839 ret = irq_expand_nr_irqs(start + cnt);
843 ret = alloc_descs(start, cnt, node, affinity, owner);
845 mutex_unlock(&sparse_irq_lock);
848 EXPORT_SYMBOL_GPL(__irq_alloc_descs);
851 * irq_get_next_irq - get next allocated irq number
852 * @offset: where to start the search
854 * Returns next irq number after offset or nr_irqs if none is found.
856 unsigned int irq_get_next_irq(unsigned int offset)
858 return irq_find_at_or_after(offset);
862 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
865 struct irq_desc *desc = irq_to_desc(irq);
868 if (check & _IRQ_DESC_CHECK) {
869 if ((check & _IRQ_DESC_PERCPU) &&
870 !irq_settings_is_per_cpu_devid(desc))
873 if (!(check & _IRQ_DESC_PERCPU) &&
874 irq_settings_is_per_cpu_devid(desc))
880 raw_spin_lock_irqsave(&desc->lock, *flags);
885 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
886 __releases(&desc->lock)
888 raw_spin_unlock_irqrestore(&desc->lock, flags);
890 chip_bus_sync_unlock(desc);
893 int irq_set_percpu_devid_partition(unsigned int irq,
894 const struct cpumask *affinity)
896 struct irq_desc *desc = irq_to_desc(irq);
901 if (desc->percpu_enabled)
904 desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
906 if (!desc->percpu_enabled)
910 desc->percpu_affinity = affinity;
912 desc->percpu_affinity = cpu_possible_mask;
914 irq_set_percpu_devid_flags(irq);
918 int irq_set_percpu_devid(unsigned int irq)
920 return irq_set_percpu_devid_partition(irq, NULL);
923 int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
925 struct irq_desc *desc = irq_to_desc(irq);
927 if (!desc || !desc->percpu_enabled)
931 cpumask_copy(affinity, desc->percpu_affinity);
935 EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
937 void kstat_incr_irq_this_cpu(unsigned int irq)
939 kstat_incr_irqs_this_cpu(irq_to_desc(irq));
943 * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
944 * @irq: The interrupt number
945 * @cpu: The cpu number
947 * Returns the sum of interrupt counts on @cpu since boot for
948 * @irq. The caller must ensure that the interrupt is not removed
951 unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
953 struct irq_desc *desc = irq_to_desc(irq);
955 return desc && desc->kstat_irqs ?
956 *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
959 static bool irq_is_nmi(struct irq_desc *desc)
961 return desc->istate & IRQS_NMI;
964 static unsigned int kstat_irqs(unsigned int irq)
966 struct irq_desc *desc = irq_to_desc(irq);
967 unsigned int sum = 0;
970 if (!desc || !desc->kstat_irqs)
972 if (!irq_settings_is_per_cpu_devid(desc) &&
973 !irq_settings_is_per_cpu(desc) &&
975 return data_race(desc->tot_count);
977 for_each_possible_cpu(cpu)
978 sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));
983 * kstat_irqs_usr - Get the statistics for an interrupt from thread context
984 * @irq: The interrupt number
986 * Returns the sum of interrupt counts on all cpus since boot for @irq.
988 * It uses rcu to protect the access since a concurrent removal of an
989 * interrupt descriptor is observing an rcu grace period before
990 * delayed_free_desc()/irq_kobj_release().
992 unsigned int kstat_irqs_usr(unsigned int irq)
997 sum = kstat_irqs(irq);
1002 #ifdef CONFIG_LOCKDEP
1003 void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
1004 struct lock_class_key *request_class)
1006 struct irq_desc *desc = irq_to_desc(irq);
1009 lockdep_set_class(&desc->lock, lock_class);
1010 lockdep_set_class(&desc->request_mutex, request_class);
1013 EXPORT_SYMBOL_GPL(__irq_set_lockdep_class);