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_each_action_of_desc(desc, action) {
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 const 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 and failures in the late irq_sysfs_init()
292 : * cannot be rolled back.
293 : */
294 : if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
295 : pr_warn("Failed to add kobject for irq %d\n", irq);
296 : else
297 : desc->istate |= IRQS_SYSFS;
298 : }
299 : }
300 :
301 : static void irq_sysfs_del(struct irq_desc *desc)
302 : {
303 : /*
304 : * Only invoke kobject_del() when kobject_add() was successfully
305 : * invoked for the descriptor. This covers both early boot, where
306 : * sysfs is not initialized yet, and the case of a failed
307 : * kobject_add() invocation.
308 : */
309 : if (desc->istate & IRQS_SYSFS)
310 : kobject_del(&desc->kobj);
311 : }
312 :
313 : static int __init irq_sysfs_init(void)
314 : {
315 : struct irq_desc *desc;
316 : int irq;
317 :
318 : /* Prevent concurrent irq alloc/free */
319 : irq_lock_sparse();
320 :
321 : irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
322 : if (!irq_kobj_base) {
323 : irq_unlock_sparse();
324 : return -ENOMEM;
325 : }
326 :
327 : /* Add the already allocated interrupts */
328 : for_each_irq_desc(irq, desc)
329 : irq_sysfs_add(irq, desc);
330 : irq_unlock_sparse();
331 :
332 : return 0;
333 : }
334 : postcore_initcall(irq_sysfs_init);
335 :
336 : #else /* !CONFIG_SYSFS */
337 :
338 : static const struct kobj_type irq_kobj_type = {
339 : .release = irq_kobj_release,
340 : };
341 :
342 : static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
343 : static void irq_sysfs_del(struct irq_desc *desc) {}
344 :
345 : #endif /* CONFIG_SYSFS */
346 :
347 : static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
348 :
349 : static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
350 : {
351 : radix_tree_insert(&irq_desc_tree, irq, desc);
352 : }
353 :
354 : struct irq_desc *irq_to_desc(unsigned int irq)
355 : {
356 : return radix_tree_lookup(&irq_desc_tree, irq);
357 : }
358 : #ifdef CONFIG_KVM_BOOK3S_64_HV_MODULE
359 : EXPORT_SYMBOL_GPL(irq_to_desc);
360 : #endif
361 :
362 : static void delete_irq_desc(unsigned int irq)
363 : {
364 : radix_tree_delete(&irq_desc_tree, irq);
365 : }
366 :
367 : #ifdef CONFIG_SMP
368 : static void free_masks(struct irq_desc *desc)
369 : {
370 : #ifdef CONFIG_GENERIC_PENDING_IRQ
371 : free_cpumask_var(desc->pending_mask);
372 : #endif
373 : free_cpumask_var(desc->irq_common_data.affinity);
374 : #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
375 : free_cpumask_var(desc->irq_common_data.effective_affinity);
376 : #endif
377 : }
378 : #else
379 : static inline void free_masks(struct irq_desc *desc) { }
380 : #endif
381 :
382 : void irq_lock_sparse(void)
383 : {
384 : mutex_lock(&sparse_irq_lock);
385 : }
386 :
387 : void irq_unlock_sparse(void)
388 : {
389 : mutex_unlock(&sparse_irq_lock);
390 : }
391 :
392 : static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
393 : const struct cpumask *affinity,
394 : struct module *owner)
395 : {
396 : struct irq_desc *desc;
397 :
398 : desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
399 : if (!desc)
400 : return NULL;
401 : /* allocate based on nr_cpu_ids */
402 : desc->kstat_irqs = alloc_percpu(unsigned int);
403 : if (!desc->kstat_irqs)
404 : goto err_desc;
405 :
406 : if (alloc_masks(desc, node))
407 : goto err_kstat;
408 :
409 : raw_spin_lock_init(&desc->lock);
410 : lockdep_set_class(&desc->lock, &irq_desc_lock_class);
411 : mutex_init(&desc->request_mutex);
412 : init_rcu_head(&desc->rcu);
413 : init_waitqueue_head(&desc->wait_for_threads);
414 :
415 : desc_set_defaults(irq, desc, node, affinity, owner);
416 : irqd_set(&desc->irq_data, flags);
417 : kobject_init(&desc->kobj, &irq_kobj_type);
418 :
419 : return desc;
420 :
421 : err_kstat:
422 : free_percpu(desc->kstat_irqs);
423 : err_desc:
424 : kfree(desc);
425 : return NULL;
426 : }
427 :
428 : static void irq_kobj_release(struct kobject *kobj)
429 : {
430 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
431 :
432 : free_masks(desc);
433 : free_percpu(desc->kstat_irqs);
434 : kfree(desc);
435 : }
436 :
437 : static void delayed_free_desc(struct rcu_head *rhp)
438 : {
439 : struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
440 :
441 : kobject_put(&desc->kobj);
442 : }
443 :
444 : static void free_desc(unsigned int irq)
445 : {
446 : struct irq_desc *desc = irq_to_desc(irq);
447 :
448 : irq_remove_debugfs_entry(desc);
449 : unregister_irq_proc(irq, desc);
450 :
451 : /*
452 : * sparse_irq_lock protects also show_interrupts() and
453 : * kstat_irq_usr(). Once we deleted the descriptor from the
454 : * sparse tree we can free it. Access in proc will fail to
455 : * lookup the descriptor.
456 : *
457 : * The sysfs entry must be serialized against a concurrent
458 : * irq_sysfs_init() as well.
459 : */
460 : irq_sysfs_del(desc);
461 : delete_irq_desc(irq);
462 :
463 : /*
464 : * We free the descriptor, masks and stat fields via RCU. That
465 : * allows demultiplex interrupts to do rcu based management of
466 : * the child interrupts.
467 : * This also allows us to use rcu in kstat_irqs_usr().
468 : */
469 : call_rcu(&desc->rcu, delayed_free_desc);
470 : }
471 :
472 : static int alloc_descs(unsigned int start, unsigned int cnt, int node,
473 : const struct irq_affinity_desc *affinity,
474 : struct module *owner)
475 : {
476 : struct irq_desc *desc;
477 : int i;
478 :
479 : /* Validate affinity mask(s) */
480 : if (affinity) {
481 : for (i = 0; i < cnt; i++) {
482 : if (cpumask_empty(&affinity[i].mask))
483 : return -EINVAL;
484 : }
485 : }
486 :
487 : for (i = 0; i < cnt; i++) {
488 : const struct cpumask *mask = NULL;
489 : unsigned int flags = 0;
490 :
491 : if (affinity) {
492 : if (affinity->is_managed) {
493 : flags = IRQD_AFFINITY_MANAGED |
494 : IRQD_MANAGED_SHUTDOWN;
495 : }
496 : mask = &affinity->mask;
497 : node = cpu_to_node(cpumask_first(mask));
498 : affinity++;
499 : }
500 :
501 : desc = alloc_desc(start + i, node, flags, mask, owner);
502 : if (!desc)
503 : goto err;
504 : irq_insert_desc(start + i, desc);
505 : irq_sysfs_add(start + i, desc);
506 : irq_add_debugfs_entry(start + i, desc);
507 : }
508 : bitmap_set(allocated_irqs, start, cnt);
509 : return start;
510 :
511 : err:
512 : for (i--; i >= 0; i--)
513 : free_desc(start + i);
514 : return -ENOMEM;
515 : }
516 :
517 : static int irq_expand_nr_irqs(unsigned int nr)
518 : {
519 : if (nr > IRQ_BITMAP_BITS)
520 : return -ENOMEM;
521 : nr_irqs = nr;
522 : return 0;
523 : }
524 :
525 : int __init early_irq_init(void)
526 : {
527 : int i, initcnt, node = first_online_node;
528 : struct irq_desc *desc;
529 :
530 : init_irq_default_affinity();
531 :
532 : /* Let arch update nr_irqs and return the nr of preallocated irqs */
533 : initcnt = arch_probe_nr_irqs();
534 : printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
535 : NR_IRQS, nr_irqs, initcnt);
536 :
537 : if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
538 : nr_irqs = IRQ_BITMAP_BITS;
539 :
540 : if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
541 : initcnt = IRQ_BITMAP_BITS;
542 :
543 : if (initcnt > nr_irqs)
544 : nr_irqs = initcnt;
545 :
546 : for (i = 0; i < initcnt; i++) {
547 : desc = alloc_desc(i, node, 0, NULL, NULL);
548 : set_bit(i, allocated_irqs);
549 : irq_insert_desc(i, desc);
550 : }
551 : return arch_early_irq_init();
552 : }
553 :
554 : #else /* !CONFIG_SPARSE_IRQ */
555 :
556 : struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
557 : [0 ... NR_IRQS-1] = {
558 : .handle_irq = handle_bad_irq,
559 : .depth = 1,
560 : .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
561 : }
562 : };
563 :
564 1 : int __init early_irq_init(void)
565 : {
566 1 : int count, i, node = first_online_node;
567 : struct irq_desc *desc;
568 :
569 : init_irq_default_affinity();
570 :
571 1 : printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
572 :
573 1 : desc = irq_desc;
574 1 : count = ARRAY_SIZE(irq_desc);
575 :
576 129 : for (i = 0; i < count; i++) {
577 128 : desc[i].kstat_irqs = alloc_percpu(unsigned int);
578 128 : alloc_masks(&desc[i], node);
579 : raw_spin_lock_init(&desc[i].lock);
580 : lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
581 128 : mutex_init(&desc[i].request_mutex);
582 128 : init_waitqueue_head(&desc[i].wait_for_threads);
583 256 : desc_set_defaults(i, &desc[i], node, NULL, NULL);
584 : }
585 1 : return arch_early_irq_init();
586 : }
587 :
588 134 : struct irq_desc *irq_to_desc(unsigned int irq)
589 : {
590 2985 : return (irq < NR_IRQS) ? irq_desc + irq : NULL;
591 : }
592 : EXPORT_SYMBOL(irq_to_desc);
593 :
594 0 : static void free_desc(unsigned int irq)
595 : {
596 0 : struct irq_desc *desc = irq_to_desc(irq);
597 : unsigned long flags;
598 :
599 0 : raw_spin_lock_irqsave(&desc->lock, flags);
600 0 : desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
601 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
602 0 : }
603 :
604 0 : static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
605 : const struct irq_affinity_desc *affinity,
606 : struct module *owner)
607 : {
608 : u32 i;
609 :
610 0 : for (i = 0; i < cnt; i++) {
611 0 : struct irq_desc *desc = irq_to_desc(start + i);
612 :
613 0 : desc->owner = owner;
614 : }
615 0 : bitmap_set(allocated_irqs, start, cnt);
616 0 : return start;
617 : }
618 :
619 : static int irq_expand_nr_irqs(unsigned int nr)
620 : {
621 : return -ENOMEM;
622 : }
623 :
624 64 : void irq_mark_irq(unsigned int irq)
625 : {
626 64 : mutex_lock(&sparse_irq_lock);
627 64 : bitmap_set(allocated_irqs, irq, 1);
628 64 : mutex_unlock(&sparse_irq_lock);
629 64 : }
630 :
631 : #ifdef CONFIG_GENERIC_IRQ_LEGACY
632 : void irq_init_desc(unsigned int irq)
633 : {
634 : free_desc(irq);
635 : }
636 : #endif
637 :
638 : #endif /* !CONFIG_SPARSE_IRQ */
639 :
640 0 : int handle_irq_desc(struct irq_desc *desc)
641 : {
642 : struct irq_data *data;
643 :
644 2723 : if (!desc)
645 : return -EINVAL;
646 :
647 2723 : data = irq_desc_get_irq_data(desc);
648 2723 : if (WARN_ON_ONCE(!in_hardirq() && handle_enforce_irqctx(data)))
649 : return -EPERM;
650 :
651 2723 : generic_handle_irq_desc(desc);
652 0 : return 0;
653 : }
654 :
655 : /**
656 : * generic_handle_irq - Invoke the handler for a particular irq
657 : * @irq: The irq number to handle
658 : *
659 : * Returns: 0 on success, or -EINVAL if conversion has failed
660 : *
661 : * This function must be called from an IRQ context with irq regs
662 : * initialized.
663 : */
664 2723 : int generic_handle_irq(unsigned int irq)
665 : {
666 5446 : return handle_irq_desc(irq_to_desc(irq));
667 : }
668 : EXPORT_SYMBOL_GPL(generic_handle_irq);
669 :
670 : /**
671 : * generic_handle_irq_safe - Invoke the handler for a particular irq from any
672 : * context.
673 : * @irq: The irq number to handle
674 : *
675 : * Returns: 0 on success, a negative value on error.
676 : *
677 : * This function can be called from any context (IRQ or process context). It
678 : * will report an error if not invoked from IRQ context and the irq has been
679 : * marked to enforce IRQ-context only.
680 : */
681 0 : int generic_handle_irq_safe(unsigned int irq)
682 : {
683 : unsigned long flags;
684 : int ret;
685 :
686 0 : local_irq_save(flags);
687 0 : ret = handle_irq_desc(irq_to_desc(irq));
688 0 : local_irq_restore(flags);
689 0 : return ret;
690 : }
691 : EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
692 :
693 : #ifdef CONFIG_IRQ_DOMAIN
694 : /**
695 : * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
696 : * to a domain.
697 : * @domain: The domain where to perform the lookup
698 : * @hwirq: The HW irq number to convert to a logical one
699 : *
700 : * Returns: 0 on success, or -EINVAL if conversion has failed
701 : *
702 : * This function must be called from an IRQ context with irq regs
703 : * initialized.
704 : */
705 0 : int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
706 : {
707 0 : return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
708 : }
709 : EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
710 :
711 : /**
712 : * generic_handle_irq_safe - Invoke the handler for a HW irq belonging
713 : * to a domain from any context.
714 : * @domain: The domain where to perform the lookup
715 : * @hwirq: The HW irq number to convert to a logical one
716 : *
717 : * Returns: 0 on success, a negative value on error.
718 : *
719 : * This function can be called from any context (IRQ or process
720 : * context). If the interrupt is marked as 'enforce IRQ-context only' then
721 : * the function must be invoked from hard interrupt context.
722 : */
723 0 : int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq)
724 : {
725 : unsigned long flags;
726 : int ret;
727 :
728 0 : local_irq_save(flags);
729 0 : ret = handle_irq_desc(irq_resolve_mapping(domain, hwirq));
730 0 : local_irq_restore(flags);
731 0 : return ret;
732 : }
733 : EXPORT_SYMBOL_GPL(generic_handle_domain_irq_safe);
734 :
735 : /**
736 : * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
737 : * to a domain.
738 : * @domain: The domain where to perform the lookup
739 : * @hwirq: The HW irq number to convert to a logical one
740 : *
741 : * Returns: 0 on success, or -EINVAL if conversion has failed
742 : *
743 : * This function must be called from an NMI context with irq regs
744 : * initialized.
745 : **/
746 0 : int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq)
747 : {
748 0 : WARN_ON_ONCE(!in_nmi());
749 0 : return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
750 : }
751 : #endif
752 :
753 : /* Dynamic interrupt handling */
754 :
755 : /**
756 : * irq_free_descs - free irq descriptors
757 : * @from: Start of descriptor range
758 : * @cnt: Number of consecutive irqs to free
759 : */
760 0 : void irq_free_descs(unsigned int from, unsigned int cnt)
761 : {
762 : int i;
763 :
764 0 : if (from >= nr_irqs || (from + cnt) > nr_irqs)
765 : return;
766 :
767 0 : mutex_lock(&sparse_irq_lock);
768 0 : for (i = 0; i < cnt; i++)
769 0 : free_desc(from + i);
770 :
771 0 : bitmap_clear(allocated_irqs, from, cnt);
772 0 : mutex_unlock(&sparse_irq_lock);
773 : }
774 : EXPORT_SYMBOL_GPL(irq_free_descs);
775 :
776 : /**
777 : * __irq_alloc_descs - allocate and initialize a range of irq descriptors
778 : * @irq: Allocate for specific irq number if irq >= 0
779 : * @from: Start the search from this irq number
780 : * @cnt: Number of consecutive irqs to allocate.
781 : * @node: Preferred node on which the irq descriptor should be allocated
782 : * @owner: Owning module (can be NULL)
783 : * @affinity: Optional pointer to an affinity mask array of size @cnt which
784 : * hints where the irq descriptors should be allocated and which
785 : * default affinities to use
786 : *
787 : * Returns the first irq number or error code
788 : */
789 : int __ref
790 0 : __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
791 : struct module *owner, const struct irq_affinity_desc *affinity)
792 : {
793 : int start, ret;
794 :
795 0 : if (!cnt)
796 : return -EINVAL;
797 :
798 0 : if (irq >= 0) {
799 0 : if (from > irq)
800 : return -EINVAL;
801 : from = irq;
802 : } else {
803 : /*
804 : * For interrupts which are freely allocated the
805 : * architecture can force a lower bound to the @from
806 : * argument. x86 uses this to exclude the GSI space.
807 : */
808 0 : from = arch_dynirq_lower_bound(from);
809 : }
810 :
811 0 : mutex_lock(&sparse_irq_lock);
812 :
813 0 : start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
814 : from, cnt, 0);
815 0 : ret = -EEXIST;
816 0 : if (irq >=0 && start != irq)
817 : goto unlock;
818 :
819 0 : if (start + cnt > nr_irqs) {
820 : ret = irq_expand_nr_irqs(start + cnt);
821 : if (ret)
822 : goto unlock;
823 : }
824 0 : ret = alloc_descs(start, cnt, node, affinity, owner);
825 : unlock:
826 0 : mutex_unlock(&sparse_irq_lock);
827 0 : return ret;
828 : }
829 : EXPORT_SYMBOL_GPL(__irq_alloc_descs);
830 :
831 : /**
832 : * irq_get_next_irq - get next allocated irq number
833 : * @offset: where to start the search
834 : *
835 : * Returns next irq number after offset or nr_irqs if none is found.
836 : */
837 0 : unsigned int irq_get_next_irq(unsigned int offset)
838 : {
839 0 : return find_next_bit(allocated_irqs, nr_irqs, offset);
840 : }
841 :
842 : struct irq_desc *
843 128 : __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
844 : unsigned int check)
845 : {
846 128 : struct irq_desc *desc = irq_to_desc(irq);
847 :
848 128 : if (desc) {
849 128 : if (check & _IRQ_DESC_CHECK) {
850 0 : if ((check & _IRQ_DESC_PERCPU) &&
851 : !irq_settings_is_per_cpu_devid(desc))
852 : return NULL;
853 :
854 0 : if (!(check & _IRQ_DESC_PERCPU) &&
855 : irq_settings_is_per_cpu_devid(desc))
856 : return NULL;
857 : }
858 :
859 128 : if (bus)
860 : chip_bus_lock(desc);
861 128 : raw_spin_lock_irqsave(&desc->lock, *flags);
862 : }
863 : return desc;
864 : }
865 :
866 128 : void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
867 : __releases(&desc->lock)
868 : {
869 256 : raw_spin_unlock_irqrestore(&desc->lock, flags);
870 128 : if (bus)
871 : chip_bus_sync_unlock(desc);
872 128 : }
873 :
874 0 : int irq_set_percpu_devid_partition(unsigned int irq,
875 : const struct cpumask *affinity)
876 : {
877 0 : struct irq_desc *desc = irq_to_desc(irq);
878 :
879 0 : if (!desc)
880 : return -EINVAL;
881 :
882 0 : if (desc->percpu_enabled)
883 : return -EINVAL;
884 :
885 0 : desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
886 :
887 0 : if (!desc->percpu_enabled)
888 : return -ENOMEM;
889 :
890 0 : if (affinity)
891 0 : desc->percpu_affinity = affinity;
892 : else
893 0 : desc->percpu_affinity = cpu_possible_mask;
894 :
895 0 : irq_set_percpu_devid_flags(irq);
896 0 : return 0;
897 : }
898 :
899 0 : int irq_set_percpu_devid(unsigned int irq)
900 : {
901 0 : return irq_set_percpu_devid_partition(irq, NULL);
902 : }
903 :
904 0 : int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
905 : {
906 0 : struct irq_desc *desc = irq_to_desc(irq);
907 :
908 0 : if (!desc || !desc->percpu_enabled)
909 : return -EINVAL;
910 :
911 0 : if (affinity)
912 0 : cpumask_copy(affinity, desc->percpu_affinity);
913 :
914 : return 0;
915 : }
916 : EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
917 :
918 0 : void kstat_incr_irq_this_cpu(unsigned int irq)
919 : {
920 0 : kstat_incr_irqs_this_cpu(irq_to_desc(irq));
921 0 : }
922 :
923 : /**
924 : * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
925 : * @irq: The interrupt number
926 : * @cpu: The cpu number
927 : *
928 : * Returns the sum of interrupt counts on @cpu since boot for
929 : * @irq. The caller must ensure that the interrupt is not removed
930 : * concurrently.
931 : */
932 0 : unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
933 : {
934 0 : struct irq_desc *desc = irq_to_desc(irq);
935 :
936 0 : return desc && desc->kstat_irqs ?
937 0 : *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
938 : }
939 :
940 : static bool irq_is_nmi(struct irq_desc *desc)
941 : {
942 0 : return desc->istate & IRQS_NMI;
943 : }
944 :
945 0 : static unsigned int kstat_irqs(unsigned int irq)
946 : {
947 0 : struct irq_desc *desc = irq_to_desc(irq);
948 0 : unsigned int sum = 0;
949 : int cpu;
950 :
951 0 : if (!desc || !desc->kstat_irqs)
952 : return 0;
953 0 : if (!irq_settings_is_per_cpu_devid(desc) &&
954 0 : !irq_settings_is_per_cpu(desc) &&
955 : !irq_is_nmi(desc))
956 0 : return data_race(desc->tot_count);
957 :
958 0 : for_each_possible_cpu(cpu)
959 0 : sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));
960 : return sum;
961 : }
962 :
963 : /**
964 : * kstat_irqs_usr - Get the statistics for an interrupt from thread context
965 : * @irq: The interrupt number
966 : *
967 : * Returns the sum of interrupt counts on all cpus since boot for @irq.
968 : *
969 : * It uses rcu to protect the access since a concurrent removal of an
970 : * interrupt descriptor is observing an rcu grace period before
971 : * delayed_free_desc()/irq_kobj_release().
972 : */
973 0 : unsigned int kstat_irqs_usr(unsigned int irq)
974 : {
975 : unsigned int sum;
976 :
977 : rcu_read_lock();
978 0 : sum = kstat_irqs(irq);
979 : rcu_read_unlock();
980 0 : return sum;
981 : }
982 :
983 : #ifdef CONFIG_LOCKDEP
984 : void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
985 : struct lock_class_key *request_class)
986 : {
987 : struct irq_desc *desc = irq_to_desc(irq);
988 :
989 : if (desc) {
990 : lockdep_set_class(&desc->lock, lock_class);
991 : lockdep_set_class(&desc->request_mutex, request_class);
992 : }
993 : }
994 : EXPORT_SYMBOL_GPL(__irq_set_lockdep_class);
995 : #endif
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