Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 : * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
5 : *
6 : * This file contains the interrupt descriptor management code. Detailed
7 : * information is available in Documentation/core-api/genericirq.rst
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 : * lockdep: we want to handle all irq_desc locks as a single lock-class:
24 : */
25 : static struct lock_class_key irq_desc_lock_class;
26 :
27 : #if defined(CONFIG_SMP)
28 : static 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 : * Set at least the boot cpu. We don't want to end up with
34 : * bugreports caused by random commandline masks
35 : */
36 : cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
37 : return 1;
38 : }
39 : __setup("irqaffinity=", irq_affinity_setup);
40 :
41 : static 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
49 : static void __init init_irq_default_affinity(void)
50 : {
51 : }
52 : #endif
53 :
54 : #ifdef CONFIG_SMP
55 : static 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 :
81 : static 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
97 : static inline int
98 : alloc_masks(struct irq_desc *desc, int node) { return 0; }
99 : static inline void
100 : desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { }
101 : #endif
102 :
103 : static 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 :
108 128 : desc->irq_common_data.handler_data = NULL;
109 128 : desc->irq_common_data.msi_desc = NULL;
110 :
111 128 : desc->irq_data.common = &desc->irq_common_data;
112 128 : desc->irq_data.irq = irq;
113 128 : desc->irq_data.chip = &no_irq_chip;
114 128 : desc->irq_data.chip_data = NULL;
115 256 : irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
116 256 : irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
117 256 : irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
118 128 : desc->handle_irq = handle_bad_irq;
119 128 : desc->depth = 1;
120 128 : desc->irq_count = 0;
121 128 : desc->irqs_unhandled = 0;
122 128 : desc->tot_count = 0;
123 128 : desc->name = NULL;
124 128 : desc->owner = owner;
125 256 : for_each_possible_cpu(cpu)
126 128 : *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
127 128 : desc_smp_init(desc, node, affinity);
128 : }
129 :
130 : int nr_irqs = NR_IRQS;
131 : EXPORT_SYMBOL_GPL(nr_irqs);
132 :
133 : static DEFINE_MUTEX(sparse_irq_lock);
134 : static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
135 :
136 : #ifdef CONFIG_SPARSE_IRQ
137 :
138 : static void irq_kobj_release(struct kobject *kobj);
139 :
140 : #ifdef CONFIG_SYSFS
141 : static struct kobject *irq_kobj_base;
142 :
143 : #define IRQ_ATTR_RO(_name) \
144 : static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
145 :
146 : static 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 : }
164 : IRQ_ATTR_RO(per_cpu_count);
165 :
166 : static 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 : }
181 : IRQ_ATTR_RO(chip_name);
182 :
183 : static 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, "%lu\n", desc->irq_data.hwirq);
192 : raw_spin_unlock_irq(&desc->lock);
193 :
194 : return ret;
195 : }
196 : IRQ_ATTR_RO(hwirq);
197 :
198 : static 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 : }
212 : IRQ_ATTR_RO(type);
213 :
214 : static 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 : }
228 : IRQ_ATTR_RO(wakeup);
229 :
230 : static 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 : }
243 : IRQ_ATTR_RO(name);
244 :
245 : static 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 : }
266 : IRQ_ATTR_RO(actions);
267 :
268 : static 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 : };
278 : ATTRIBUTE_GROUPS(irq);
279 :
280 : static struct kobj_type irq_kobj_type = {
281 : .release = irq_kobj_release,
282 : .sysfs_ops = &kobj_sysfs_ops,
283 : .default_groups = irq_groups,
284 : };
285 :
286 : static void irq_sysfs_add(int irq, struct irq_desc *desc)
287 : {
288 : if (irq_kobj_base) {
289 : /*
290 : * Continue even in case of failure as this is nothing
291 : * crucial.
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 :
298 : static void irq_sysfs_del(struct irq_desc *desc)
299 : {
300 : /*
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
304 : * it conditional.
305 : */
306 : if (irq_kobj_base)
307 : kobject_del(&desc->kobj);
308 : }
309 :
310 : static int __init irq_sysfs_init(void)
311 : {
312 : struct irq_desc *desc;
313 : int irq;
314 :
315 : /* Prevent concurrent irq alloc/free */
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 : /* Add the already allocated interrupts */
325 : for_each_irq_desc(irq, desc)
326 : irq_sysfs_add(irq, desc);
327 : irq_unlock_sparse();
328 :
329 : return 0;
330 : }
331 : postcore_initcall(irq_sysfs_init);
332 :
333 : #else /* !CONFIG_SYSFS */
334 :
335 : static struct kobj_type irq_kobj_type = {
336 : .release = irq_kobj_release,
337 : };
338 :
339 : static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
340 : static void irq_sysfs_del(struct irq_desc *desc) {}
341 :
342 : #endif /* CONFIG_SYSFS */
343 :
344 : static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
345 :
346 : static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
347 : {
348 : radix_tree_insert(&irq_desc_tree, irq, desc);
349 : }
350 :
351 : struct 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
356 : EXPORT_SYMBOL_GPL(irq_to_desc);
357 : #endif
358 :
359 : static void delete_irq_desc(unsigned int irq)
360 : {
361 : radix_tree_delete(&irq_desc_tree, irq);
362 : }
363 :
364 : #ifdef CONFIG_SMP
365 : static 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
376 : static inline void free_masks(struct irq_desc *desc) { }
377 : #endif
378 :
379 : void irq_lock_sparse(void)
380 : {
381 : mutex_lock(&sparse_irq_lock);
382 : }
383 :
384 : void irq_unlock_sparse(void)
385 : {
386 : mutex_unlock(&sparse_irq_lock);
387 : }
388 :
389 : static 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 : /* allocate based on nr_cpu_ids */
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 : init_waitqueue_head(&desc->wait_for_threads);
411 :
412 : desc_set_defaults(irq, desc, node, affinity, owner);
413 : irqd_set(&desc->irq_data, flags);
414 : kobject_init(&desc->kobj, &irq_kobj_type);
415 :
416 : return desc;
417 :
418 : err_kstat:
419 : free_percpu(desc->kstat_irqs);
420 : err_desc:
421 : kfree(desc);
422 : return NULL;
423 : }
424 :
425 : static void irq_kobj_release(struct kobject *kobj)
426 : {
427 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
428 :
429 : free_masks(desc);
430 : free_percpu(desc->kstat_irqs);
431 : kfree(desc);
432 : }
433 :
434 : static void delayed_free_desc(struct rcu_head *rhp)
435 : {
436 : struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
437 :
438 : kobject_put(&desc->kobj);
439 : }
440 :
441 : static void free_desc(unsigned int irq)
442 : {
443 : struct irq_desc *desc = irq_to_desc(irq);
444 :
445 : irq_remove_debugfs_entry(desc);
446 : unregister_irq_proc(irq, desc);
447 :
448 : /*
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.
453 : *
454 : * The sysfs entry must be serialized against a concurrent
455 : * irq_sysfs_init() as well.
456 : */
457 : irq_sysfs_del(desc);
458 : delete_irq_desc(irq);
459 :
460 : /*
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().
465 : */
466 : call_rcu(&desc->rcu, delayed_free_desc);
467 : }
468 :
469 : static int alloc_descs(unsigned int start, unsigned int cnt, int node,
470 : const struct irq_affinity_desc *affinity,
471 : struct module *owner)
472 : {
473 : struct irq_desc *desc;
474 : int i;
475 :
476 : /* Validate affinity mask(s) */
477 : if (affinity) {
478 : for (i = 0; i < cnt; i++) {
479 : if (cpumask_empty(&affinity[i].mask))
480 : return -EINVAL;
481 : }
482 : }
483 :
484 : for (i = 0; i < cnt; i++) {
485 : const struct cpumask *mask = NULL;
486 : unsigned int flags = 0;
487 :
488 : if (affinity) {
489 : if (affinity->is_managed) {
490 : flags = IRQD_AFFINITY_MANAGED |
491 : IRQD_MANAGED_SHUTDOWN;
492 : }
493 : mask = &affinity->mask;
494 : node = cpu_to_node(cpumask_first(mask));
495 : affinity++;
496 : }
497 :
498 : desc = alloc_desc(start + i, node, flags, mask, owner);
499 : if (!desc)
500 : goto err;
501 : irq_insert_desc(start + i, desc);
502 : irq_sysfs_add(start + i, desc);
503 : irq_add_debugfs_entry(start + i, desc);
504 : }
505 : bitmap_set(allocated_irqs, start, cnt);
506 : return start;
507 :
508 : err:
509 : for (i--; i >= 0; i--)
510 : free_desc(start + i);
511 : return -ENOMEM;
512 : }
513 :
514 : static int irq_expand_nr_irqs(unsigned int nr)
515 : {
516 : if (nr > IRQ_BITMAP_BITS)
517 : return -ENOMEM;
518 : nr_irqs = nr;
519 : return 0;
520 : }
521 :
522 : int __init early_irq_init(void)
523 : {
524 : int i, initcnt, node = first_online_node;
525 : struct irq_desc *desc;
526 :
527 : init_irq_default_affinity();
528 :
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);
533 :
534 : if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
535 : nr_irqs = IRQ_BITMAP_BITS;
536 :
537 : if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
538 : initcnt = IRQ_BITMAP_BITS;
539 :
540 : if (initcnt > nr_irqs)
541 : nr_irqs = initcnt;
542 :
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);
547 : }
548 : return arch_early_irq_init();
549 : }
550 :
551 : #else /* !CONFIG_SPARSE_IRQ */
552 :
553 : struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
554 : [0 ... NR_IRQS-1] = {
555 : .handle_irq = handle_bad_irq,
556 : .depth = 1,
557 : .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
558 : }
559 : };
560 :
561 1 : int __init early_irq_init(void)
562 : {
563 1 : int count, i, node = first_online_node;
564 : struct irq_desc *desc;
565 :
566 : init_irq_default_affinity();
567 :
568 1 : printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
569 :
570 1 : desc = irq_desc;
571 1 : count = ARRAY_SIZE(irq_desc);
572 :
573 129 : for (i = 0; i < count; i++) {
574 128 : desc[i].kstat_irqs = alloc_percpu(unsigned int);
575 128 : alloc_masks(&desc[i], node);
576 : raw_spin_lock_init(&desc[i].lock);
577 : lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
578 128 : mutex_init(&desc[i].request_mutex);
579 128 : init_waitqueue_head(&desc[i].wait_for_threads);
580 256 : desc_set_defaults(i, &desc[i], node, NULL, NULL);
581 : }
582 1 : return arch_early_irq_init();
583 : }
584 :
585 134 : struct irq_desc *irq_to_desc(unsigned int irq)
586 : {
587 275 : return (irq < NR_IRQS) ? irq_desc + irq : NULL;
588 : }
589 : EXPORT_SYMBOL(irq_to_desc);
590 :
591 0 : static void free_desc(unsigned int irq)
592 : {
593 0 : struct irq_desc *desc = irq_to_desc(irq);
594 : unsigned long flags;
595 :
596 0 : raw_spin_lock_irqsave(&desc->lock, flags);
597 0 : desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
598 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
599 0 : }
600 :
601 0 : static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
602 : const struct irq_affinity_desc *affinity,
603 : struct module *owner)
604 : {
605 : u32 i;
606 :
607 0 : for (i = 0; i < cnt; i++) {
608 0 : struct irq_desc *desc = irq_to_desc(start + i);
609 :
610 0 : desc->owner = owner;
611 : }
612 0 : bitmap_set(allocated_irqs, start, cnt);
613 0 : return start;
614 : }
615 :
616 : static int irq_expand_nr_irqs(unsigned int nr)
617 : {
618 : return -ENOMEM;
619 : }
620 :
621 64 : void irq_mark_irq(unsigned int irq)
622 : {
623 64 : mutex_lock(&sparse_irq_lock);
624 64 : bitmap_set(allocated_irqs, irq, 1);
625 64 : mutex_unlock(&sparse_irq_lock);
626 64 : }
627 :
628 : #ifdef CONFIG_GENERIC_IRQ_LEGACY
629 : void irq_init_desc(unsigned int irq)
630 : {
631 : free_desc(irq);
632 : }
633 : #endif
634 :
635 : #endif /* !CONFIG_SPARSE_IRQ */
636 :
637 0 : int handle_irq_desc(struct irq_desc *desc)
638 : {
639 : struct irq_data *data;
640 :
641 13 : if (!desc)
642 : return -EINVAL;
643 :
644 13 : data = irq_desc_get_irq_data(desc);
645 13 : if (WARN_ON_ONCE(!in_hardirq() && handle_enforce_irqctx(data)))
646 : return -EPERM;
647 :
648 13 : generic_handle_irq_desc(desc);
649 0 : return 0;
650 : }
651 :
652 : /**
653 : * generic_handle_irq - Invoke the handler for a particular irq
654 : * @irq: The irq number to handle
655 : *
656 : * Returns: 0 on success, or -EINVAL if conversion has failed
657 : *
658 : * This function must be called from an IRQ context with irq regs
659 : * initialized.
660 : */
661 13 : int generic_handle_irq(unsigned int irq)
662 : {
663 26 : return handle_irq_desc(irq_to_desc(irq));
664 : }
665 : EXPORT_SYMBOL_GPL(generic_handle_irq);
666 :
667 : /**
668 : * generic_handle_irq_safe - Invoke the handler for a particular irq from any
669 : * context.
670 : * @irq: The irq number to handle
671 : *
672 : * Returns: 0 on success, a negative value on error.
673 : *
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.
677 : */
678 0 : int generic_handle_irq_safe(unsigned int irq)
679 : {
680 : unsigned long flags;
681 : int ret;
682 :
683 0 : local_irq_save(flags);
684 0 : ret = handle_irq_desc(irq_to_desc(irq));
685 0 : local_irq_restore(flags);
686 0 : return ret;
687 : }
688 : EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
689 :
690 : #ifdef CONFIG_IRQ_DOMAIN
691 : /**
692 : * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
693 : * to a domain.
694 : * @domain: The domain where to perform the lookup
695 : * @hwirq: The HW irq number to convert to a logical one
696 : *
697 : * Returns: 0 on success, or -EINVAL if conversion has failed
698 : *
699 : * This function must be called from an IRQ context with irq regs
700 : * initialized.
701 : */
702 0 : int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
703 : {
704 0 : return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
705 : }
706 : EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
707 :
708 : /**
709 : * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
710 : * to a domain.
711 : * @domain: The domain where to perform the lookup
712 : * @hwirq: The HW irq number to convert to a logical one
713 : *
714 : * Returns: 0 on success, or -EINVAL if conversion has failed
715 : *
716 : * This function must be called from an NMI context with irq regs
717 : * initialized.
718 : **/
719 0 : int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq)
720 : {
721 0 : WARN_ON_ONCE(!in_nmi());
722 0 : return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
723 : }
724 : #endif
725 :
726 : /* Dynamic interrupt handling */
727 :
728 : /**
729 : * irq_free_descs - free irq descriptors
730 : * @from: Start of descriptor range
731 : * @cnt: Number of consecutive irqs to free
732 : */
733 0 : void irq_free_descs(unsigned int from, unsigned int cnt)
734 : {
735 : int i;
736 :
737 0 : if (from >= nr_irqs || (from + cnt) > nr_irqs)
738 : return;
739 :
740 0 : mutex_lock(&sparse_irq_lock);
741 0 : for (i = 0; i < cnt; i++)
742 0 : free_desc(from + i);
743 :
744 0 : bitmap_clear(allocated_irqs, from, cnt);
745 0 : mutex_unlock(&sparse_irq_lock);
746 : }
747 : EXPORT_SYMBOL_GPL(irq_free_descs);
748 :
749 : /**
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
759 : *
760 : * Returns the first irq number or error code
761 : */
762 : int __ref
763 0 : __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
764 : struct module *owner, const struct irq_affinity_desc *affinity)
765 : {
766 : int start, ret;
767 :
768 0 : if (!cnt)
769 : return -EINVAL;
770 :
771 0 : if (irq >= 0) {
772 0 : if (from > irq)
773 : return -EINVAL;
774 : from = irq;
775 : } else {
776 : /*
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.
780 : */
781 0 : from = arch_dynirq_lower_bound(from);
782 : }
783 :
784 0 : mutex_lock(&sparse_irq_lock);
785 :
786 0 : start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
787 : from, cnt, 0);
788 0 : ret = -EEXIST;
789 0 : if (irq >=0 && start != irq)
790 : goto unlock;
791 :
792 0 : if (start + cnt > nr_irqs) {
793 : ret = irq_expand_nr_irqs(start + cnt);
794 : if (ret)
795 : goto unlock;
796 : }
797 0 : ret = alloc_descs(start, cnt, node, affinity, owner);
798 : unlock:
799 0 : mutex_unlock(&sparse_irq_lock);
800 0 : return ret;
801 : }
802 : EXPORT_SYMBOL_GPL(__irq_alloc_descs);
803 :
804 : /**
805 : * irq_get_next_irq - get next allocated irq number
806 : * @offset: where to start the search
807 : *
808 : * Returns next irq number after offset or nr_irqs if none is found.
809 : */
810 0 : unsigned int irq_get_next_irq(unsigned int offset)
811 : {
812 0 : return find_next_bit(allocated_irqs, nr_irqs, offset);
813 : }
814 :
815 : struct irq_desc *
816 128 : __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
817 : unsigned int check)
818 : {
819 128 : struct irq_desc *desc = irq_to_desc(irq);
820 :
821 128 : if (desc) {
822 128 : if (check & _IRQ_DESC_CHECK) {
823 0 : if ((check & _IRQ_DESC_PERCPU) &&
824 : !irq_settings_is_per_cpu_devid(desc))
825 : return NULL;
826 :
827 0 : if (!(check & _IRQ_DESC_PERCPU) &&
828 : irq_settings_is_per_cpu_devid(desc))
829 : return NULL;
830 : }
831 :
832 128 : if (bus)
833 : chip_bus_lock(desc);
834 128 : raw_spin_lock_irqsave(&desc->lock, *flags);
835 : }
836 : return desc;
837 : }
838 :
839 128 : void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
840 : __releases(&desc->lock)
841 : {
842 256 : raw_spin_unlock_irqrestore(&desc->lock, flags);
843 128 : if (bus)
844 : chip_bus_sync_unlock(desc);
845 128 : }
846 :
847 0 : int irq_set_percpu_devid_partition(unsigned int irq,
848 : const struct cpumask *affinity)
849 : {
850 0 : struct irq_desc *desc = irq_to_desc(irq);
851 :
852 0 : if (!desc)
853 : return -EINVAL;
854 :
855 0 : if (desc->percpu_enabled)
856 : return -EINVAL;
857 :
858 0 : desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
859 :
860 0 : if (!desc->percpu_enabled)
861 : return -ENOMEM;
862 :
863 0 : if (affinity)
864 0 : desc->percpu_affinity = affinity;
865 : else
866 0 : desc->percpu_affinity = cpu_possible_mask;
867 :
868 0 : irq_set_percpu_devid_flags(irq);
869 0 : return 0;
870 : }
871 :
872 0 : int irq_set_percpu_devid(unsigned int irq)
873 : {
874 0 : return irq_set_percpu_devid_partition(irq, NULL);
875 : }
876 :
877 0 : int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
878 : {
879 0 : struct irq_desc *desc = irq_to_desc(irq);
880 :
881 0 : if (!desc || !desc->percpu_enabled)
882 : return -EINVAL;
883 :
884 0 : if (affinity)
885 0 : cpumask_copy(affinity, desc->percpu_affinity);
886 :
887 : return 0;
888 : }
889 : EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
890 :
891 0 : void kstat_incr_irq_this_cpu(unsigned int irq)
892 : {
893 0 : kstat_incr_irqs_this_cpu(irq_to_desc(irq));
894 0 : }
895 :
896 : /**
897 : * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
898 : * @irq: The interrupt number
899 : * @cpu: The cpu number
900 : *
901 : * Returns the sum of interrupt counts on @cpu since boot for
902 : * @irq. The caller must ensure that the interrupt is not removed
903 : * concurrently.
904 : */
905 0 : unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
906 : {
907 0 : struct irq_desc *desc = irq_to_desc(irq);
908 :
909 0 : return desc && desc->kstat_irqs ?
910 0 : *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
911 : }
912 :
913 : static bool irq_is_nmi(struct irq_desc *desc)
914 : {
915 0 : return desc->istate & IRQS_NMI;
916 : }
917 :
918 0 : static unsigned int kstat_irqs(unsigned int irq)
919 : {
920 0 : struct irq_desc *desc = irq_to_desc(irq);
921 0 : unsigned int sum = 0;
922 : int cpu;
923 :
924 0 : if (!desc || !desc->kstat_irqs)
925 : return 0;
926 0 : if (!irq_settings_is_per_cpu_devid(desc) &&
927 0 : !irq_settings_is_per_cpu(desc) &&
928 : !irq_is_nmi(desc))
929 0 : return data_race(desc->tot_count);
930 :
931 0 : for_each_possible_cpu(cpu)
932 0 : sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));
933 : return sum;
934 : }
935 :
936 : /**
937 : * kstat_irqs_usr - Get the statistics for an interrupt from thread context
938 : * @irq: The interrupt number
939 : *
940 : * Returns the sum of interrupt counts on all cpus since boot for @irq.
941 : *
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().
945 : */
946 0 : unsigned int kstat_irqs_usr(unsigned int irq)
947 : {
948 : unsigned int sum;
949 :
950 : rcu_read_lock();
951 0 : sum = kstat_irqs(irq);
952 : rcu_read_unlock();
953 0 : return sum;
954 : }
955 :
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)
959 : {
960 : struct irq_desc *desc = irq_to_desc(irq);
961 :
962 : if (desc) {
963 : lockdep_set_class(&desc->lock, lock_class);
964 : lockdep_set_class(&desc->request_mutex, request_class);
965 : }
966 : }
967 : EXPORT_SYMBOL_GPL(__irq_set_lockdep_class);
968 : #endif
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