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/maple_tree.h>
16 : #include <linux/irqdomain.h>
17 : #include <linux/sysfs.h>
18 :
19 : #include "internals.h"
20 :
21 : /*
22 : * lockdep: we want to handle all irq_desc locks as a single lock-class:
23 : */
24 : static struct lock_class_key irq_desc_lock_class;
25 :
26 : #if defined(CONFIG_SMP)
27 : static int __init irq_affinity_setup(char *str)
28 : {
29 : alloc_bootmem_cpumask_var(&irq_default_affinity);
30 : cpulist_parse(str, irq_default_affinity);
31 : /*
32 : * Set at least the boot cpu. We don't want to end up with
33 : * bugreports caused by random commandline masks
34 : */
35 : cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
36 : return 1;
37 : }
38 : __setup("irqaffinity=", irq_affinity_setup);
39 :
40 : static void __init init_irq_default_affinity(void)
41 : {
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);
46 : }
47 : #else
48 : static void __init init_irq_default_affinity(void)
49 : {
50 : }
51 : #endif
52 :
53 : #ifdef CONFIG_SMP
54 : static int alloc_masks(struct irq_desc *desc, int node)
55 : {
56 : if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,
57 : GFP_KERNEL, node))
58 : return -ENOMEM;
59 :
60 : #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
61 : if (!zalloc_cpumask_var_node(&desc->irq_common_data.effective_affinity,
62 : GFP_KERNEL, node)) {
63 : free_cpumask_var(desc->irq_common_data.affinity);
64 : return -ENOMEM;
65 : }
66 : #endif
67 :
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);
72 : #endif
73 : free_cpumask_var(desc->irq_common_data.affinity);
74 : return -ENOMEM;
75 : }
76 : #endif
77 : return 0;
78 : }
79 :
80 : static void desc_smp_init(struct irq_desc *desc, int node,
81 : const struct cpumask *affinity)
82 : {
83 : if (!affinity)
84 : affinity = irq_default_affinity;
85 : cpumask_copy(desc->irq_common_data.affinity, affinity);
86 :
87 : #ifdef CONFIG_GENERIC_PENDING_IRQ
88 : cpumask_clear(desc->pending_mask);
89 : #endif
90 : #ifdef CONFIG_NUMA
91 : desc->irq_common_data.node = node;
92 : #endif
93 : }
94 :
95 : #else
96 : static inline int
97 : alloc_masks(struct irq_desc *desc, int node) { return 0; }
98 : static inline void
99 : desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { }
100 : #endif
101 :
102 : static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
103 : const struct cpumask *affinity, struct module *owner)
104 : {
105 : int cpu;
106 :
107 128 : desc->irq_common_data.handler_data = NULL;
108 128 : desc->irq_common_data.msi_desc = NULL;
109 :
110 128 : desc->irq_data.common = &desc->irq_common_data;
111 128 : desc->irq_data.irq = irq;
112 128 : desc->irq_data.chip = &no_irq_chip;
113 128 : desc->irq_data.chip_data = NULL;
114 256 : irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
115 256 : irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
116 256 : irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
117 128 : desc->handle_irq = handle_bad_irq;
118 128 : desc->depth = 1;
119 128 : desc->irq_count = 0;
120 128 : desc->irqs_unhandled = 0;
121 128 : desc->tot_count = 0;
122 128 : desc->name = NULL;
123 128 : desc->owner = owner;
124 256 : for_each_possible_cpu(cpu)
125 128 : *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
126 128 : desc_smp_init(desc, node, affinity);
127 : }
128 :
129 : int nr_irqs = NR_IRQS;
130 : EXPORT_SYMBOL_GPL(nr_irqs);
131 :
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 |
136 : MT_FLAGS_USE_RCU,
137 : sparse_irq_lock);
138 :
139 0 : static int irq_find_free_area(unsigned int from, unsigned int cnt)
140 : {
141 0 : MA_STATE(mas, &sparse_irqs, 0, 0);
142 :
143 0 : if (mas_empty_area(&mas, from, MAX_SPARSE_IRQS, cnt))
144 : return -ENOSPC;
145 0 : return mas.index;
146 : }
147 :
148 0 : static unsigned int irq_find_at_or_after(unsigned int offset)
149 : {
150 0 : unsigned long index = offset;
151 0 : struct irq_desc *desc = mt_find(&sparse_irqs, &index, nr_irqs);
152 :
153 0 : return desc ? irq_desc_get_irq(desc) : nr_irqs;
154 : }
155 :
156 64 : static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
157 : {
158 64 : MA_STATE(mas, &sparse_irqs, irq, irq);
159 64 : WARN_ON(mas_store_gfp(&mas, desc, GFP_KERNEL) != 0);
160 64 : }
161 :
162 0 : static void delete_irq_desc(unsigned int irq)
163 : {
164 0 : MA_STATE(mas, &sparse_irqs, irq, irq);
165 0 : mas_erase(&mas);
166 0 : }
167 :
168 : #ifdef CONFIG_SPARSE_IRQ
169 :
170 : static void irq_kobj_release(struct kobject *kobj);
171 :
172 : #ifdef CONFIG_SYSFS
173 : static struct kobject *irq_kobj_base;
174 :
175 : #define IRQ_ATTR_RO(_name) \
176 : static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
177 :
178 : static ssize_t per_cpu_count_show(struct kobject *kobj,
179 : struct kobj_attribute *attr, char *buf)
180 : {
181 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
182 : ssize_t ret = 0;
183 : char *p = "";
184 : int cpu;
185 :
186 : for_each_possible_cpu(cpu) {
187 : unsigned int c = irq_desc_kstat_cpu(desc, cpu);
188 :
189 : ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
190 : p = ",";
191 : }
192 :
193 : ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
194 : return ret;
195 : }
196 : IRQ_ATTR_RO(per_cpu_count);
197 :
198 : static ssize_t chip_name_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 : if (desc->irq_data.chip && desc->irq_data.chip->name) {
206 : ret = scnprintf(buf, PAGE_SIZE, "%s\n",
207 : desc->irq_data.chip->name);
208 : }
209 : raw_spin_unlock_irq(&desc->lock);
210 :
211 : return ret;
212 : }
213 : IRQ_ATTR_RO(chip_name);
214 :
215 : static ssize_t hwirq_show(struct kobject *kobj,
216 : struct kobj_attribute *attr, char *buf)
217 : {
218 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
219 : ssize_t ret = 0;
220 :
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);
225 :
226 : return ret;
227 : }
228 : IRQ_ATTR_RO(hwirq);
229 :
230 : static ssize_t type_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 : ret = sprintf(buf, "%s\n",
238 : irqd_is_level_type(&desc->irq_data) ? "level" : "edge");
239 : raw_spin_unlock_irq(&desc->lock);
240 :
241 : return ret;
242 :
243 : }
244 : IRQ_ATTR_RO(type);
245 :
246 : static ssize_t wakeup_show(struct kobject *kobj,
247 : struct kobj_attribute *attr, char *buf)
248 : {
249 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
250 : ssize_t ret = 0;
251 :
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);
256 :
257 : return ret;
258 :
259 : }
260 : IRQ_ATTR_RO(wakeup);
261 :
262 : static ssize_t name_show(struct kobject *kobj,
263 : struct kobj_attribute *attr, char *buf)
264 : {
265 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
266 : ssize_t ret = 0;
267 :
268 : raw_spin_lock_irq(&desc->lock);
269 : if (desc->name)
270 : ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);
271 : raw_spin_unlock_irq(&desc->lock);
272 :
273 : return ret;
274 : }
275 : IRQ_ATTR_RO(name);
276 :
277 : static ssize_t actions_show(struct kobject *kobj,
278 : struct kobj_attribute *attr, char *buf)
279 : {
280 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
281 : struct irqaction *action;
282 : ssize_t ret = 0;
283 : char *p = "";
284 :
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",
288 : p, action->name);
289 : p = ",";
290 : }
291 : raw_spin_unlock_irq(&desc->lock);
292 :
293 : if (ret)
294 : ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
295 :
296 : return ret;
297 : }
298 : IRQ_ATTR_RO(actions);
299 :
300 : static struct attribute *irq_attrs[] = {
301 : &per_cpu_count_attr.attr,
302 : &chip_name_attr.attr,
303 : &hwirq_attr.attr,
304 : &type_attr.attr,
305 : &wakeup_attr.attr,
306 : &name_attr.attr,
307 : &actions_attr.attr,
308 : NULL
309 : };
310 : ATTRIBUTE_GROUPS(irq);
311 :
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,
316 : };
317 :
318 : static void irq_sysfs_add(int irq, struct irq_desc *desc)
319 : {
320 : if (irq_kobj_base) {
321 : /*
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.
325 : */
326 : if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
327 : pr_warn("Failed to add kobject for irq %d\n", irq);
328 : else
329 : desc->istate |= IRQS_SYSFS;
330 : }
331 : }
332 :
333 : static void irq_sysfs_del(struct irq_desc *desc)
334 : {
335 : /*
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.
340 : */
341 : if (desc->istate & IRQS_SYSFS)
342 : kobject_del(&desc->kobj);
343 : }
344 :
345 : static int __init irq_sysfs_init(void)
346 : {
347 : struct irq_desc *desc;
348 : int irq;
349 :
350 : /* Prevent concurrent irq alloc/free */
351 : irq_lock_sparse();
352 :
353 : irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
354 : if (!irq_kobj_base) {
355 : irq_unlock_sparse();
356 : return -ENOMEM;
357 : }
358 :
359 : /* Add the already allocated interrupts */
360 : for_each_irq_desc(irq, desc)
361 : irq_sysfs_add(irq, desc);
362 : irq_unlock_sparse();
363 :
364 : return 0;
365 : }
366 : postcore_initcall(irq_sysfs_init);
367 :
368 : #else /* !CONFIG_SYSFS */
369 :
370 : static const struct kobj_type irq_kobj_type = {
371 : .release = irq_kobj_release,
372 : };
373 :
374 : static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
375 : static void irq_sysfs_del(struct irq_desc *desc) {}
376 :
377 : #endif /* CONFIG_SYSFS */
378 :
379 : struct irq_desc *irq_to_desc(unsigned int irq)
380 : {
381 : return mtree_load(&sparse_irqs, irq);
382 : }
383 : #ifdef CONFIG_KVM_BOOK3S_64_HV_MODULE
384 : EXPORT_SYMBOL_GPL(irq_to_desc);
385 : #endif
386 :
387 : #ifdef CONFIG_SMP
388 : static void free_masks(struct irq_desc *desc)
389 : {
390 : #ifdef CONFIG_GENERIC_PENDING_IRQ
391 : free_cpumask_var(desc->pending_mask);
392 : #endif
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);
396 : #endif
397 : }
398 : #else
399 : static inline void free_masks(struct irq_desc *desc) { }
400 : #endif
401 :
402 : void irq_lock_sparse(void)
403 : {
404 : mutex_lock(&sparse_irq_lock);
405 : }
406 :
407 : void irq_unlock_sparse(void)
408 : {
409 : mutex_unlock(&sparse_irq_lock);
410 : }
411 :
412 : static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
413 : const struct cpumask *affinity,
414 : struct module *owner)
415 : {
416 : struct irq_desc *desc;
417 :
418 : desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
419 : if (!desc)
420 : return NULL;
421 : /* allocate based on nr_cpu_ids */
422 : desc->kstat_irqs = alloc_percpu(unsigned int);
423 : if (!desc->kstat_irqs)
424 : goto err_desc;
425 :
426 : if (alloc_masks(desc, node))
427 : goto err_kstat;
428 :
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);
434 :
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);
439 :
440 : return desc;
441 :
442 : err_kstat:
443 : free_percpu(desc->kstat_irqs);
444 : err_desc:
445 : kfree(desc);
446 : return NULL;
447 : }
448 :
449 : static void irq_kobj_release(struct kobject *kobj)
450 : {
451 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
452 :
453 : free_masks(desc);
454 : free_percpu(desc->kstat_irqs);
455 : kfree(desc);
456 : }
457 :
458 : static void delayed_free_desc(struct rcu_head *rhp)
459 : {
460 : struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
461 :
462 : kobject_put(&desc->kobj);
463 : }
464 :
465 : static void free_desc(unsigned int irq)
466 : {
467 : struct irq_desc *desc = irq_to_desc(irq);
468 :
469 : irq_remove_debugfs_entry(desc);
470 : unregister_irq_proc(irq, desc);
471 :
472 : /*
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.
477 : *
478 : * The sysfs entry must be serialized against a concurrent
479 : * irq_sysfs_init() as well.
480 : */
481 : irq_sysfs_del(desc);
482 : delete_irq_desc(irq);
483 :
484 : /*
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().
489 : */
490 : call_rcu(&desc->rcu, delayed_free_desc);
491 : }
492 :
493 : static int alloc_descs(unsigned int start, unsigned int cnt, int node,
494 : const struct irq_affinity_desc *affinity,
495 : struct module *owner)
496 : {
497 : struct irq_desc *desc;
498 : int i;
499 :
500 : /* Validate affinity mask(s) */
501 : if (affinity) {
502 : for (i = 0; i < cnt; i++) {
503 : if (cpumask_empty(&affinity[i].mask))
504 : return -EINVAL;
505 : }
506 : }
507 :
508 : for (i = 0; i < cnt; i++) {
509 : const struct cpumask *mask = NULL;
510 : unsigned int flags = 0;
511 :
512 : if (affinity) {
513 : if (affinity->is_managed) {
514 : flags = IRQD_AFFINITY_MANAGED |
515 : IRQD_MANAGED_SHUTDOWN;
516 : }
517 : mask = &affinity->mask;
518 : node = cpu_to_node(cpumask_first(mask));
519 : affinity++;
520 : }
521 :
522 : desc = alloc_desc(start + i, node, flags, mask, owner);
523 : if (!desc)
524 : goto err;
525 : irq_insert_desc(start + i, desc);
526 : irq_sysfs_add(start + i, desc);
527 : irq_add_debugfs_entry(start + i, desc);
528 : }
529 : return start;
530 :
531 : err:
532 : for (i--; i >= 0; i--)
533 : free_desc(start + i);
534 : return -ENOMEM;
535 : }
536 :
537 : static int irq_expand_nr_irqs(unsigned int nr)
538 : {
539 : if (nr > MAX_SPARSE_IRQS)
540 : return -ENOMEM;
541 : nr_irqs = nr;
542 : return 0;
543 : }
544 :
545 : int __init early_irq_init(void)
546 : {
547 : int i, initcnt, node = first_online_node;
548 : struct irq_desc *desc;
549 :
550 : init_irq_default_affinity();
551 :
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);
556 :
557 : if (WARN_ON(nr_irqs > MAX_SPARSE_IRQS))
558 : nr_irqs = MAX_SPARSE_IRQS;
559 :
560 : if (WARN_ON(initcnt > MAX_SPARSE_IRQS))
561 : initcnt = MAX_SPARSE_IRQS;
562 :
563 : if (initcnt > nr_irqs)
564 : nr_irqs = initcnt;
565 :
566 : for (i = 0; i < initcnt; i++) {
567 : desc = alloc_desc(i, node, 0, NULL, NULL);
568 : irq_insert_desc(i, desc);
569 : }
570 : return arch_early_irq_init();
571 : }
572 :
573 : #else /* !CONFIG_SPARSE_IRQ */
574 :
575 : struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
576 : [0 ... NR_IRQS-1] = {
577 : .handle_irq = handle_bad_irq,
578 : .depth = 1,
579 : .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
580 : }
581 : };
582 :
583 1 : int __init early_irq_init(void)
584 : {
585 1 : int count, i, node = first_online_node;
586 : struct irq_desc *desc;
587 :
588 : init_irq_default_affinity();
589 :
590 1 : printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
591 :
592 1 : desc = irq_desc;
593 1 : count = ARRAY_SIZE(irq_desc);
594 :
595 129 : for (i = 0; i < count; i++) {
596 128 : desc[i].kstat_irqs = alloc_percpu(unsigned int);
597 128 : alloc_masks(&desc[i], node);
598 : raw_spin_lock_init(&desc[i].lock);
599 : lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
600 128 : mutex_init(&desc[i].request_mutex);
601 128 : init_waitqueue_head(&desc[i].wait_for_threads);
602 256 : desc_set_defaults(i, &desc[i], node, NULL, NULL);
603 128 : irq_resend_init(desc);
604 : }
605 1 : return arch_early_irq_init();
606 : }
607 :
608 134 : struct irq_desc *irq_to_desc(unsigned int irq)
609 : {
610 267 : return (irq < NR_IRQS) ? irq_desc + irq : NULL;
611 : }
612 : EXPORT_SYMBOL(irq_to_desc);
613 :
614 0 : static void free_desc(unsigned int irq)
615 : {
616 0 : struct irq_desc *desc = irq_to_desc(irq);
617 : unsigned long flags;
618 :
619 0 : raw_spin_lock_irqsave(&desc->lock, flags);
620 0 : desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
621 0 : raw_spin_unlock_irqrestore(&desc->lock, flags);
622 0 : delete_irq_desc(irq);
623 0 : }
624 :
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)
628 : {
629 : u32 i;
630 :
631 0 : for (i = 0; i < cnt; i++) {
632 0 : struct irq_desc *desc = irq_to_desc(start + i);
633 :
634 0 : desc->owner = owner;
635 0 : irq_insert_desc(start + i, desc);
636 : }
637 : return start;
638 : }
639 :
640 : static int irq_expand_nr_irqs(unsigned int nr)
641 : {
642 : return -ENOMEM;
643 : }
644 :
645 64 : void irq_mark_irq(unsigned int irq)
646 : {
647 64 : mutex_lock(&sparse_irq_lock);
648 64 : irq_insert_desc(irq, irq_desc + irq);
649 64 : mutex_unlock(&sparse_irq_lock);
650 64 : }
651 :
652 : #ifdef CONFIG_GENERIC_IRQ_LEGACY
653 : void irq_init_desc(unsigned int irq)
654 : {
655 : free_desc(irq);
656 : }
657 : #endif
658 :
659 : #endif /* !CONFIG_SPARSE_IRQ */
660 :
661 0 : int handle_irq_desc(struct irq_desc *desc)
662 : {
663 : struct irq_data *data;
664 :
665 5 : if (!desc)
666 : return -EINVAL;
667 :
668 5 : data = irq_desc_get_irq_data(desc);
669 5 : if (WARN_ON_ONCE(!in_hardirq() && handle_enforce_irqctx(data)))
670 : return -EPERM;
671 :
672 5 : generic_handle_irq_desc(desc);
673 0 : return 0;
674 : }
675 :
676 : /**
677 : * generic_handle_irq - Invoke the handler for a particular irq
678 : * @irq: The irq number to handle
679 : *
680 : * Returns: 0 on success, or -EINVAL if conversion has failed
681 : *
682 : * This function must be called from an IRQ context with irq regs
683 : * initialized.
684 : */
685 5 : int generic_handle_irq(unsigned int irq)
686 : {
687 10 : return handle_irq_desc(irq_to_desc(irq));
688 : }
689 : EXPORT_SYMBOL_GPL(generic_handle_irq);
690 :
691 : /**
692 : * generic_handle_irq_safe - Invoke the handler for a particular irq from any
693 : * context.
694 : * @irq: The irq number to handle
695 : *
696 : * Returns: 0 on success, a negative value on error.
697 : *
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.
701 : */
702 0 : int generic_handle_irq_safe(unsigned int irq)
703 : {
704 : unsigned long flags;
705 : int ret;
706 :
707 0 : local_irq_save(flags);
708 0 : ret = handle_irq_desc(irq_to_desc(irq));
709 0 : local_irq_restore(flags);
710 0 : return ret;
711 : }
712 : EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
713 :
714 : #ifdef CONFIG_IRQ_DOMAIN
715 : /**
716 : * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
717 : * to a domain.
718 : * @domain: The domain where to perform the lookup
719 : * @hwirq: The HW irq number to convert to a logical one
720 : *
721 : * Returns: 0 on success, or -EINVAL if conversion has failed
722 : *
723 : * This function must be called from an IRQ context with irq regs
724 : * initialized.
725 : */
726 0 : int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
727 : {
728 0 : return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
729 : }
730 : EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
731 :
732 : /**
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
737 : *
738 : * Returns: 0 on success, a negative value on error.
739 : *
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.
743 : */
744 0 : int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq)
745 : {
746 : unsigned long flags;
747 : int ret;
748 :
749 0 : local_irq_save(flags);
750 0 : ret = handle_irq_desc(irq_resolve_mapping(domain, hwirq));
751 0 : local_irq_restore(flags);
752 0 : return ret;
753 : }
754 : EXPORT_SYMBOL_GPL(generic_handle_domain_irq_safe);
755 :
756 : /**
757 : * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
758 : * to a domain.
759 : * @domain: The domain where to perform the lookup
760 : * @hwirq: The HW irq number to convert to a logical one
761 : *
762 : * Returns: 0 on success, or -EINVAL if conversion has failed
763 : *
764 : * This function must be called from an NMI context with irq regs
765 : * initialized.
766 : **/
767 0 : int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq)
768 : {
769 0 : WARN_ON_ONCE(!in_nmi());
770 0 : return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
771 : }
772 : #endif
773 :
774 : /* Dynamic interrupt handling */
775 :
776 : /**
777 : * irq_free_descs - free irq descriptors
778 : * @from: Start of descriptor range
779 : * @cnt: Number of consecutive irqs to free
780 : */
781 0 : void irq_free_descs(unsigned int from, unsigned int cnt)
782 : {
783 : int i;
784 :
785 0 : if (from >= nr_irqs || (from + cnt) > nr_irqs)
786 : return;
787 :
788 0 : mutex_lock(&sparse_irq_lock);
789 0 : for (i = 0; i < cnt; i++)
790 0 : free_desc(from + i);
791 :
792 0 : mutex_unlock(&sparse_irq_lock);
793 : }
794 : EXPORT_SYMBOL_GPL(irq_free_descs);
795 :
796 : /**
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
806 : *
807 : * Returns the first irq number or error code
808 : */
809 : int __ref
810 0 : __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
811 : struct module *owner, const struct irq_affinity_desc *affinity)
812 : {
813 : int start, ret;
814 :
815 0 : if (!cnt)
816 : return -EINVAL;
817 :
818 0 : if (irq >= 0) {
819 0 : if (from > irq)
820 : return -EINVAL;
821 : from = irq;
822 : } else {
823 : /*
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.
827 : */
828 0 : from = arch_dynirq_lower_bound(from);
829 : }
830 :
831 0 : mutex_lock(&sparse_irq_lock);
832 :
833 0 : start = irq_find_free_area(from, cnt);
834 0 : ret = -EEXIST;
835 0 : if (irq >=0 && start != irq)
836 : goto unlock;
837 :
838 0 : if (start + cnt > nr_irqs) {
839 : ret = irq_expand_nr_irqs(start + cnt);
840 : if (ret)
841 : goto unlock;
842 : }
843 : ret = alloc_descs(start, cnt, node, affinity, owner);
844 : unlock:
845 0 : mutex_unlock(&sparse_irq_lock);
846 0 : return ret;
847 : }
848 : EXPORT_SYMBOL_GPL(__irq_alloc_descs);
849 :
850 : /**
851 : * irq_get_next_irq - get next allocated irq number
852 : * @offset: where to start the search
853 : *
854 : * Returns next irq number after offset or nr_irqs if none is found.
855 : */
856 0 : unsigned int irq_get_next_irq(unsigned int offset)
857 : {
858 0 : return irq_find_at_or_after(offset);
859 : }
860 :
861 : struct irq_desc *
862 128 : __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
863 : unsigned int check)
864 : {
865 128 : struct irq_desc *desc = irq_to_desc(irq);
866 :
867 128 : if (desc) {
868 128 : if (check & _IRQ_DESC_CHECK) {
869 0 : if ((check & _IRQ_DESC_PERCPU) &&
870 : !irq_settings_is_per_cpu_devid(desc))
871 : return NULL;
872 :
873 0 : if (!(check & _IRQ_DESC_PERCPU) &&
874 : irq_settings_is_per_cpu_devid(desc))
875 : return NULL;
876 : }
877 :
878 128 : if (bus)
879 : chip_bus_lock(desc);
880 128 : raw_spin_lock_irqsave(&desc->lock, *flags);
881 : }
882 : return desc;
883 : }
884 :
885 128 : void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
886 : __releases(&desc->lock)
887 : {
888 256 : raw_spin_unlock_irqrestore(&desc->lock, flags);
889 128 : if (bus)
890 : chip_bus_sync_unlock(desc);
891 128 : }
892 :
893 0 : int irq_set_percpu_devid_partition(unsigned int irq,
894 : const struct cpumask *affinity)
895 : {
896 0 : struct irq_desc *desc = irq_to_desc(irq);
897 :
898 0 : if (!desc)
899 : return -EINVAL;
900 :
901 0 : if (desc->percpu_enabled)
902 : return -EINVAL;
903 :
904 0 : desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
905 :
906 0 : if (!desc->percpu_enabled)
907 : return -ENOMEM;
908 :
909 0 : if (affinity)
910 0 : desc->percpu_affinity = affinity;
911 : else
912 0 : desc->percpu_affinity = cpu_possible_mask;
913 :
914 0 : irq_set_percpu_devid_flags(irq);
915 0 : return 0;
916 : }
917 :
918 0 : int irq_set_percpu_devid(unsigned int irq)
919 : {
920 0 : return irq_set_percpu_devid_partition(irq, NULL);
921 : }
922 :
923 0 : int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
924 : {
925 0 : struct irq_desc *desc = irq_to_desc(irq);
926 :
927 0 : if (!desc || !desc->percpu_enabled)
928 : return -EINVAL;
929 :
930 0 : if (affinity)
931 0 : cpumask_copy(affinity, desc->percpu_affinity);
932 :
933 : return 0;
934 : }
935 : EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
936 :
937 0 : void kstat_incr_irq_this_cpu(unsigned int irq)
938 : {
939 0 : kstat_incr_irqs_this_cpu(irq_to_desc(irq));
940 0 : }
941 :
942 : /**
943 : * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
944 : * @irq: The interrupt number
945 : * @cpu: The cpu number
946 : *
947 : * Returns the sum of interrupt counts on @cpu since boot for
948 : * @irq. The caller must ensure that the interrupt is not removed
949 : * concurrently.
950 : */
951 0 : unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
952 : {
953 0 : struct irq_desc *desc = irq_to_desc(irq);
954 :
955 0 : return desc && desc->kstat_irqs ?
956 0 : *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
957 : }
958 :
959 : static bool irq_is_nmi(struct irq_desc *desc)
960 : {
961 0 : return desc->istate & IRQS_NMI;
962 : }
963 :
964 0 : static unsigned int kstat_irqs(unsigned int irq)
965 : {
966 0 : struct irq_desc *desc = irq_to_desc(irq);
967 0 : unsigned int sum = 0;
968 : int cpu;
969 :
970 0 : if (!desc || !desc->kstat_irqs)
971 : return 0;
972 0 : if (!irq_settings_is_per_cpu_devid(desc) &&
973 0 : !irq_settings_is_per_cpu(desc) &&
974 : !irq_is_nmi(desc))
975 0 : return data_race(desc->tot_count);
976 :
977 0 : for_each_possible_cpu(cpu)
978 0 : sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));
979 : return sum;
980 : }
981 :
982 : /**
983 : * kstat_irqs_usr - Get the statistics for an interrupt from thread context
984 : * @irq: The interrupt number
985 : *
986 : * Returns the sum of interrupt counts on all cpus since boot for @irq.
987 : *
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().
991 : */
992 0 : unsigned int kstat_irqs_usr(unsigned int irq)
993 : {
994 : unsigned int sum;
995 :
996 : rcu_read_lock();
997 0 : sum = kstat_irqs(irq);
998 : rcu_read_unlock();
999 0 : return sum;
1000 : }
1001 :
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)
1005 : {
1006 : struct irq_desc *desc = irq_to_desc(irq);
1007 :
1008 : if (desc) {
1009 : lockdep_set_class(&desc->lock, lock_class);
1010 : lockdep_set_class(&desc->request_mutex, request_class);
1011 : }
1012 : }
1013 : EXPORT_SYMBOL_GPL(__irq_set_lockdep_class);
1014 : #endif
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