1
2
3
4
5
6
7
8
9
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>
19
20#include "internals.h"
21
22
23
24
25static struct lock_class_key irq_desc_lock_class;
26
27#if defined(CONFIG_SMP)
28static int __init irq_affinity_setup(char *str)
29{
30 alloc_bootmem_cpumask_var(&irq_default_affinity);
31 cpulist_parse(str, irq_default_affinity);
32
33
34
35
36 cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
37 return 1;
38}
39__setup("irqaffinity=", irq_affinity_setup);
40
41static void __init init_irq_default_affinity(void)
42{
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);
47}
48#else
49static void __init init_irq_default_affinity(void)
50{
51}
52#endif
53
54#ifdef CONFIG_SMP
55static int alloc_masks(struct irq_desc *desc, int node)
56{
57 if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,
58 GFP_KERNEL, node))
59 return -ENOMEM;
60
61#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
62 if (!zalloc_cpumask_var_node(&desc->irq_common_data.effective_affinity,
63 GFP_KERNEL, node)) {
64 free_cpumask_var(desc->irq_common_data.affinity);
65 return -ENOMEM;
66 }
67#endif
68
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);
73#endif
74 free_cpumask_var(desc->irq_common_data.affinity);
75 return -ENOMEM;
76 }
77#endif
78 return 0;
79}
80
81static void desc_smp_init(struct irq_desc *desc, int node,
82 const struct cpumask *affinity)
83{
84 if (!affinity)
85 affinity = irq_default_affinity;
86 cpumask_copy(desc->irq_common_data.affinity, affinity);
87
88#ifdef CONFIG_GENERIC_PENDING_IRQ
89 cpumask_clear(desc->pending_mask);
90#endif
91#ifdef CONFIG_NUMA
92 desc->irq_common_data.node = node;
93#endif
94}
95
96#else
97static inline int
98alloc_masks(struct irq_desc *desc, int node) { return 0; }
99static inline void
100desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { }
101#endif
102
103static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
104 const struct cpumask *affinity, struct module *owner)
105{
106 int cpu;
107
108 desc->irq_common_data.handler_data = NULL;
109 desc->irq_common_data.msi_desc = NULL;
110
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;
119 desc->depth = 1;
120 desc->irq_count = 0;
121 desc->irqs_unhandled = 0;
122 desc->tot_count = 0;
123 desc->name = NULL;
124 desc->owner = owner;
125 for_each_possible_cpu(cpu)
126 *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
127 desc_smp_init(desc, node, affinity);
128}
129
130int nr_irqs = NR_IRQS;
131EXPORT_SYMBOL_GPL(nr_irqs);
132
133static DEFINE_MUTEX(sparse_irq_lock);
134static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
135
136#ifdef CONFIG_SPARSE_IRQ
137
138static void irq_kobj_release(struct kobject *kobj);
139
140#ifdef CONFIG_SYSFS
141static struct kobject *irq_kobj_base;
142
143#define IRQ_ATTR_RO(_name) \
144static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
145
146static ssize_t per_cpu_count_show(struct kobject *kobj,
147 struct kobj_attribute *attr, char *buf)
148{
149 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
150 ssize_t ret = 0;
151 char *p = "";
152 int cpu;
153
154 for_each_possible_cpu(cpu) {
155 unsigned int c = irq_desc_kstat_cpu(desc, cpu);
156
157 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
158 p = ",";
159 }
160
161 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
162 return ret;
163}
164IRQ_ATTR_RO(per_cpu_count);
165
166static ssize_t chip_name_show(struct kobject *kobj,
167 struct kobj_attribute *attr, char *buf)
168{
169 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
170 ssize_t ret = 0;
171
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);
176 }
177 raw_spin_unlock_irq(&desc->lock);
178
179 return ret;
180}
181IRQ_ATTR_RO(chip_name);
182
183static ssize_t hwirq_show(struct kobject *kobj,
184 struct kobj_attribute *attr, char *buf)
185{
186 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
187 ssize_t ret = 0;
188
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);
193
194 return ret;
195}
196IRQ_ATTR_RO(hwirq);
197
198static ssize_t type_show(struct kobject *kobj,
199 struct kobj_attribute *attr, char *buf)
200{
201 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
202 ssize_t ret = 0;
203
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);
208
209 return ret;
210
211}
212IRQ_ATTR_RO(type);
213
214static ssize_t wakeup_show(struct kobject *kobj,
215 struct kobj_attribute *attr, char *buf)
216{
217 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
218 ssize_t ret = 0;
219
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);
224
225 return ret;
226
227}
228IRQ_ATTR_RO(wakeup);
229
230static ssize_t name_show(struct kobject *kobj,
231 struct kobj_attribute *attr, char *buf)
232{
233 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
234 ssize_t ret = 0;
235
236 raw_spin_lock_irq(&desc->lock);
237 if (desc->name)
238 ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);
239 raw_spin_unlock_irq(&desc->lock);
240
241 return ret;
242}
243IRQ_ATTR_RO(name);
244
245static ssize_t actions_show(struct kobject *kobj,
246 struct kobj_attribute *attr, char *buf)
247{
248 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
249 struct irqaction *action;
250 ssize_t ret = 0;
251 char *p = "";
252
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",
256 p, action->name);
257 p = ",";
258 }
259 raw_spin_unlock_irq(&desc->lock);
260
261 if (ret)
262 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
263
264 return ret;
265}
266IRQ_ATTR_RO(actions);
267
268static struct attribute *irq_attrs[] = {
269 &per_cpu_count_attr.attr,
270 &chip_name_attr.attr,
271 &hwirq_attr.attr,
272 &type_attr.attr,
273 &wakeup_attr.attr,
274 &name_attr.attr,
275 &actions_attr.attr,
276 NULL
277};
278ATTRIBUTE_GROUPS(irq);
279
280static struct kobj_type irq_kobj_type = {
281 .release = irq_kobj_release,
282 .sysfs_ops = &kobj_sysfs_ops,
283 .default_groups = irq_groups,
284};
285
286static void irq_sysfs_add(int irq, struct irq_desc *desc)
287{
288 if (irq_kobj_base) {
289
290
291
292
293 if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
294 pr_warn("Failed to add kobject for irq %d\n", irq);
295 }
296}
297
298static void irq_sysfs_del(struct irq_desc *desc)
299{
300
301
302
303
304
305
306 if (irq_kobj_base)
307 kobject_del(&desc->kobj);
308}
309
310static int __init irq_sysfs_init(void)
311{
312 struct irq_desc *desc;
313 int irq;
314
315
316 irq_lock_sparse();
317
318 irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
319 if (!irq_kobj_base) {
320 irq_unlock_sparse();
321 return -ENOMEM;
322 }
323
324
325 for_each_irq_desc(irq, desc)
326 irq_sysfs_add(irq, desc);
327 irq_unlock_sparse();
328
329 return 0;
330}
331postcore_initcall(irq_sysfs_init);
332
333#else
334
335static struct kobj_type irq_kobj_type = {
336 .release = irq_kobj_release,
337};
338
339static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
340static void irq_sysfs_del(struct irq_desc *desc) {}
341
342#endif
343
344static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
345
346static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
347{
348 radix_tree_insert(&irq_desc_tree, irq, desc);
349}
350
351struct irq_desc *irq_to_desc(unsigned int irq)
352{
353 return radix_tree_lookup(&irq_desc_tree, irq);
354}
355#ifdef CONFIG_KVM_BOOK3S_64_HV_MODULE
356EXPORT_SYMBOL_GPL(irq_to_desc);
357#endif
358
359static void delete_irq_desc(unsigned int irq)
360{
361 radix_tree_delete(&irq_desc_tree, irq);
362}
363
364#ifdef CONFIG_SMP
365static void free_masks(struct irq_desc *desc)
366{
367#ifdef CONFIG_GENERIC_PENDING_IRQ
368 free_cpumask_var(desc->pending_mask);
369#endif
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);
373#endif
374}
375#else
376static inline void free_masks(struct irq_desc *desc) { }
377#endif
378
379void irq_lock_sparse(void)
380{
381 mutex_lock(&sparse_irq_lock);
382}
383
384void irq_unlock_sparse(void)
385{
386 mutex_unlock(&sparse_irq_lock);
387}
388
389static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
390 const struct cpumask *affinity,
391 struct module *owner)
392{
393 struct irq_desc *desc;
394
395 desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
396 if (!desc)
397 return NULL;
398
399 desc->kstat_irqs = alloc_percpu(unsigned int);
400 if (!desc->kstat_irqs)
401 goto err_desc;
402
403 if (alloc_masks(desc, node))
404 goto err_kstat;
405
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
411 desc_set_defaults(irq, desc, node, affinity, owner);
412 irqd_set(&desc->irq_data, flags);
413 kobject_init(&desc->kobj, &irq_kobj_type);
414
415 return desc;
416
417err_kstat:
418 free_percpu(desc->kstat_irqs);
419err_desc:
420 kfree(desc);
421 return NULL;
422}
423
424static void irq_kobj_release(struct kobject *kobj)
425{
426 struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
427
428 free_masks(desc);
429 free_percpu(desc->kstat_irqs);
430 kfree(desc);
431}
432
433static void delayed_free_desc(struct rcu_head *rhp)
434{
435 struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
436
437 kobject_put(&desc->kobj);
438}
439
440static void free_desc(unsigned int irq)
441{
442 struct irq_desc *desc = irq_to_desc(irq);
443
444 irq_remove_debugfs_entry(desc);
445 unregister_irq_proc(irq, desc);
446
447
448
449
450
451
452
453
454
455
456 irq_sysfs_del(desc);
457 delete_irq_desc(irq);
458
459
460
461
462
463
464
465 call_rcu(&desc->rcu, delayed_free_desc);
466}
467
468static int alloc_descs(unsigned int start, unsigned int cnt, int node,
469 const struct irq_affinity_desc *affinity,
470 struct module *owner)
471{
472 struct irq_desc *desc;
473 int i;
474
475
476 if (affinity) {
477 for (i = 0; i < cnt; i++) {
478 if (cpumask_empty(&affinity[i].mask))
479 return -EINVAL;
480 }
481 }
482
483 for (i = 0; i < cnt; i++) {
484 const struct cpumask *mask = NULL;
485 unsigned int flags = 0;
486
487 if (affinity) {
488 if (affinity->is_managed) {
489 flags = IRQD_AFFINITY_MANAGED |
490 IRQD_MANAGED_SHUTDOWN;
491 }
492 mask = &affinity->mask;
493 node = cpu_to_node(cpumask_first(mask));
494 affinity++;
495 }
496
497 desc = alloc_desc(start + i, node, flags, mask, owner);
498 if (!desc)
499 goto err;
500 irq_insert_desc(start + i, desc);
501 irq_sysfs_add(start + i, desc);
502 irq_add_debugfs_entry(start + i, desc);
503 }
504 bitmap_set(allocated_irqs, start, cnt);
505 return start;
506
507err:
508 for (i--; i >= 0; i--)
509 free_desc(start + i);
510 return -ENOMEM;
511}
512
513static int irq_expand_nr_irqs(unsigned int nr)
514{
515 if (nr > IRQ_BITMAP_BITS)
516 return -ENOMEM;
517 nr_irqs = nr;
518 return 0;
519}
520
521int __init early_irq_init(void)
522{
523 int i, initcnt, node = first_online_node;
524 struct irq_desc *desc;
525
526 init_irq_default_affinity();
527
528
529 initcnt = arch_probe_nr_irqs();
530 printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
531 NR_IRQS, nr_irqs, initcnt);
532
533 if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
534 nr_irqs = IRQ_BITMAP_BITS;
535
536 if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
537 initcnt = IRQ_BITMAP_BITS;
538
539 if (initcnt > nr_irqs)
540 nr_irqs = initcnt;
541
542 for (i = 0; i < initcnt; i++) {
543 desc = alloc_desc(i, node, 0, NULL, NULL);
544 set_bit(i, allocated_irqs);
545 irq_insert_desc(i, desc);
546 }
547 return arch_early_irq_init();
548}
549
550#else
551
552struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
553 [0 ... NR_IRQS-1] = {
554 .handle_irq = handle_bad_irq,
555 .depth = 1,
556 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
557 }
558};
559
560int __init early_irq_init(void)
561{
562 int count, i, node = first_online_node;
563 struct irq_desc *desc;
564
565 init_irq_default_affinity();
566
567 printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
568
569 desc = irq_desc;
570 count = ARRAY_SIZE(irq_desc);
571
572 for (i = 0; i < count; i++) {
573 desc[i].kstat_irqs = alloc_percpu(unsigned int);
574 alloc_masks(&desc[i], node);
575 raw_spin_lock_init(&desc[i].lock);
576 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
577 mutex_init(&desc[i].request_mutex);
578 desc_set_defaults(i, &desc[i], node, NULL, NULL);
579 }
580 return arch_early_irq_init();
581}
582
583struct irq_desc *irq_to_desc(unsigned int irq)
584{
585 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
586}
587EXPORT_SYMBOL(irq_to_desc);
588
589static void free_desc(unsigned int irq)
590{
591 struct irq_desc *desc = irq_to_desc(irq);
592 unsigned long flags;
593
594 raw_spin_lock_irqsave(&desc->lock, flags);
595 desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
596 raw_spin_unlock_irqrestore(&desc->lock, flags);
597}
598
599static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
600 const struct irq_affinity_desc *affinity,
601 struct module *owner)
602{
603 u32 i;
604
605 for (i = 0; i < cnt; i++) {
606 struct irq_desc *desc = irq_to_desc(start + i);
607
608 desc->owner = owner;
609 }
610 bitmap_set(allocated_irqs, start, cnt);
611 return start;
612}
613
614static int irq_expand_nr_irqs(unsigned int nr)
615{
616 return -ENOMEM;
617}
618
619void irq_mark_irq(unsigned int irq)
620{
621 mutex_lock(&sparse_irq_lock);
622 bitmap_set(allocated_irqs, irq, 1);
623 mutex_unlock(&sparse_irq_lock);
624}
625
626#ifdef CONFIG_GENERIC_IRQ_LEGACY
627void irq_init_desc(unsigned int irq)
628{
629 free_desc(irq);
630}
631#endif
632
633#endif
634
635int handle_irq_desc(struct irq_desc *desc)
636{
637 struct irq_data *data;
638
639 if (!desc)
640 return -EINVAL;
641
642 data = irq_desc_get_irq_data(desc);
643 if (WARN_ON_ONCE(!in_irq() && handle_enforce_irqctx(data)))
644 return -EPERM;
645
646 generic_handle_irq_desc(desc);
647 return 0;
648}
649EXPORT_SYMBOL_GPL(handle_irq_desc);
650
651
652
653
654
655
656int generic_handle_irq(unsigned int irq)
657{
658 return handle_irq_desc(irq_to_desc(irq));
659}
660EXPORT_SYMBOL_GPL(generic_handle_irq);
661
662#ifdef CONFIG_IRQ_DOMAIN
663
664
665
666
667
668
669
670
671
672
673int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
674{
675 return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
676}
677EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
678
679#ifdef CONFIG_HANDLE_DOMAIN_IRQ
680
681
682
683
684
685
686
687
688
689int handle_domain_irq(struct irq_domain *domain,
690 unsigned int hwirq, struct pt_regs *regs)
691{
692 struct pt_regs *old_regs = set_irq_regs(regs);
693 struct irq_desc *desc;
694 int ret = 0;
695
696 irq_enter();
697
698
699 desc = irq_resolve_mapping(domain, hwirq);
700 if (likely(desc))
701 handle_irq_desc(desc);
702 else
703 ret = -EINVAL;
704
705 irq_exit();
706 set_irq_regs(old_regs);
707 return ret;
708}
709
710
711
712
713
714
715
716
717
718
719
720int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq,
721 struct pt_regs *regs)
722{
723 struct pt_regs *old_regs = set_irq_regs(regs);
724 struct irq_desc *desc;
725 int ret = 0;
726
727
728
729
730 WARN_ON(!in_nmi());
731
732 desc = irq_resolve_mapping(domain, hwirq);
733
734
735
736
737
738 if (likely(desc))
739 handle_irq_desc(desc);
740 else
741 ret = -EINVAL;
742
743 set_irq_regs(old_regs);
744 return ret;
745}
746#endif
747#endif
748
749
750
751
752
753
754
755
756void irq_free_descs(unsigned int from, unsigned int cnt)
757{
758 int i;
759
760 if (from >= nr_irqs || (from + cnt) > nr_irqs)
761 return;
762
763 mutex_lock(&sparse_irq_lock);
764 for (i = 0; i < cnt; i++)
765 free_desc(from + i);
766
767 bitmap_clear(allocated_irqs, from, cnt);
768 mutex_unlock(&sparse_irq_lock);
769}
770EXPORT_SYMBOL_GPL(irq_free_descs);
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785int __ref
786__irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
787 struct module *owner, const struct irq_affinity_desc *affinity)
788{
789 int start, ret;
790
791 if (!cnt)
792 return -EINVAL;
793
794 if (irq >= 0) {
795 if (from > irq)
796 return -EINVAL;
797 from = irq;
798 } else {
799
800
801
802
803
804 from = arch_dynirq_lower_bound(from);
805 }
806
807 mutex_lock(&sparse_irq_lock);
808
809 start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
810 from, cnt, 0);
811 ret = -EEXIST;
812 if (irq >=0 && start != irq)
813 goto unlock;
814
815 if (start + cnt > nr_irqs) {
816 ret = irq_expand_nr_irqs(start + cnt);
817 if (ret)
818 goto unlock;
819 }
820 ret = alloc_descs(start, cnt, node, affinity, owner);
821unlock:
822 mutex_unlock(&sparse_irq_lock);
823 return ret;
824}
825EXPORT_SYMBOL_GPL(__irq_alloc_descs);
826
827
828
829
830
831
832
833unsigned int irq_get_next_irq(unsigned int offset)
834{
835 return find_next_bit(allocated_irqs, nr_irqs, offset);
836}
837
838struct irq_desc *
839__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
840 unsigned int check)
841{
842 struct irq_desc *desc = irq_to_desc(irq);
843
844 if (desc) {
845 if (check & _IRQ_DESC_CHECK) {
846 if ((check & _IRQ_DESC_PERCPU) &&
847 !irq_settings_is_per_cpu_devid(desc))
848 return NULL;
849
850 if (!(check & _IRQ_DESC_PERCPU) &&
851 irq_settings_is_per_cpu_devid(desc))
852 return NULL;
853 }
854
855 if (bus)
856 chip_bus_lock(desc);
857 raw_spin_lock_irqsave(&desc->lock, *flags);
858 }
859 return desc;
860}
861
862void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
863 __releases(&desc->lock)
864{
865 raw_spin_unlock_irqrestore(&desc->lock, flags);
866 if (bus)
867 chip_bus_sync_unlock(desc);
868}
869
870int irq_set_percpu_devid_partition(unsigned int irq,
871 const struct cpumask *affinity)
872{
873 struct irq_desc *desc = irq_to_desc(irq);
874
875 if (!desc)
876 return -EINVAL;
877
878 if (desc->percpu_enabled)
879 return -EINVAL;
880
881 desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
882
883 if (!desc->percpu_enabled)
884 return -ENOMEM;
885
886 if (affinity)
887 desc->percpu_affinity = affinity;
888 else
889 desc->percpu_affinity = cpu_possible_mask;
890
891 irq_set_percpu_devid_flags(irq);
892 return 0;
893}
894
895int irq_set_percpu_devid(unsigned int irq)
896{
897 return irq_set_percpu_devid_partition(irq, NULL);
898}
899
900int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
901{
902 struct irq_desc *desc = irq_to_desc(irq);
903
904 if (!desc || !desc->percpu_enabled)
905 return -EINVAL;
906
907 if (affinity)
908 cpumask_copy(affinity, desc->percpu_affinity);
909
910 return 0;
911}
912EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
913
914void kstat_incr_irq_this_cpu(unsigned int irq)
915{
916 kstat_incr_irqs_this_cpu(irq_to_desc(irq));
917}
918
919
920
921
922
923
924
925
926
927
928unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
929{
930 struct irq_desc *desc = irq_to_desc(irq);
931
932 return desc && desc->kstat_irqs ?
933 *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
934}
935
936static bool irq_is_nmi(struct irq_desc *desc)
937{
938 return desc->istate & IRQS_NMI;
939}
940
941static unsigned int kstat_irqs(unsigned int irq)
942{
943 struct irq_desc *desc = irq_to_desc(irq);
944 unsigned int sum = 0;
945 int cpu;
946
947 if (!desc || !desc->kstat_irqs)
948 return 0;
949 if (!irq_settings_is_per_cpu_devid(desc) &&
950 !irq_settings_is_per_cpu(desc) &&
951 !irq_is_nmi(desc))
952 return data_race(desc->tot_count);
953
954 for_each_possible_cpu(cpu)
955 sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));
956 return sum;
957}
958
959
960
961
962
963
964
965
966
967
968
969unsigned int kstat_irqs_usr(unsigned int irq)
970{
971 unsigned int sum;
972
973 rcu_read_lock();
974 sum = kstat_irqs(irq);
975 rcu_read_unlock();
976 return sum;
977}
978
979#ifdef CONFIG_LOCKDEP
980void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
981 struct lock_class_key *request_class)
982{
983 struct irq_desc *desc = irq_to_desc(irq);
984
985 if (desc) {
986 lockdep_set_class(&desc->lock, lock_class);
987 lockdep_set_class(&desc->request_mutex, request_class);
988 }
989}
990EXPORT_SYMBOL_GPL(__irq_set_lockdep_class);
991#endif
992