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 0 : static int __init irq_affinity_setup(char *str)
29 : {
30 0 : alloc_bootmem_cpumask_var(&irq_default_affinity);
31 0 : 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 comandline masks
35 : */
36 0 : cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
37 0 : return 1;
38 : }
39 : __setup("irqaffinity=", irq_affinity_setup);
40 :
41 1 : static void __init init_irq_default_affinity(void)
42 : {
43 1 : if (!cpumask_available(irq_default_affinity))
44 1 : zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
45 1 : if (cpumask_empty(irq_default_affinity))
46 1 : cpumask_setall(irq_default_affinity);
47 1 : }
48 : #else
49 : static void __init init_irq_default_affinity(void)
50 : {
51 : }
52 : #endif
53 :
54 : #ifdef CONFIG_SMP
55 16 : static int alloc_masks(struct irq_desc *desc, int node)
56 : {
57 16 : 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 16 : 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 16 : 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 16 : return 0;
79 : }
80 :
81 16 : static void desc_smp_init(struct irq_desc *desc, int node,
82 : const struct cpumask *affinity)
83 : {
84 16 : if (!affinity)
85 16 : affinity = irq_default_affinity;
86 16 : cpumask_copy(desc->irq_common_data.affinity, affinity);
87 :
88 : #ifdef CONFIG_GENERIC_PENDING_IRQ
89 16 : cpumask_clear(desc->pending_mask);
90 : #endif
91 : #ifdef CONFIG_NUMA
92 16 : desc->irq_common_data.node = node;
93 : #endif
94 16 : }
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 16 : static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
104 : const struct cpumask *affinity, struct module *owner)
105 : {
106 16 : int cpu;
107 :
108 16 : desc->irq_common_data.handler_data = NULL;
109 16 : desc->irq_common_data.msi_desc = NULL;
110 :
111 16 : desc->irq_data.common = &desc->irq_common_data;
112 16 : desc->irq_data.irq = irq;
113 16 : desc->irq_data.chip = &no_irq_chip;
114 16 : desc->irq_data.chip_data = NULL;
115 16 : irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
116 16 : irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
117 16 : irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
118 16 : desc->handle_irq = handle_bad_irq;
119 16 : desc->depth = 1;
120 16 : desc->irq_count = 0;
121 16 : desc->irqs_unhandled = 0;
122 16 : desc->tot_count = 0;
123 16 : desc->name = NULL;
124 16 : desc->owner = owner;
125 80 : for_each_possible_cpu(cpu)
126 64 : *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
127 16 : desc_smp_init(desc, node, affinity);
128 16 : }
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 0 : static ssize_t per_cpu_count_show(struct kobject *kobj,
147 : struct kobj_attribute *attr, char *buf)
148 : {
149 0 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
150 0 : ssize_t ret = 0;
151 0 : char *p = "";
152 0 : int cpu;
153 :
154 0 : for_each_possible_cpu(cpu) {
155 0 : unsigned int c = irq_desc_kstat_cpu(desc, cpu);
156 :
157 0 : ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
158 0 : p = ",";
159 : }
160 :
161 0 : ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
162 0 : return ret;
163 : }
164 : IRQ_ATTR_RO(per_cpu_count);
165 :
166 0 : static ssize_t chip_name_show(struct kobject *kobj,
167 : struct kobj_attribute *attr, char *buf)
168 : {
169 0 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
170 0 : ssize_t ret = 0;
171 :
172 0 : raw_spin_lock_irq(&desc->lock);
173 0 : if (desc->irq_data.chip && desc->irq_data.chip->name) {
174 0 : ret = scnprintf(buf, PAGE_SIZE, "%s\n",
175 : desc->irq_data.chip->name);
176 : }
177 0 : raw_spin_unlock_irq(&desc->lock);
178 :
179 0 : return ret;
180 : }
181 : IRQ_ATTR_RO(chip_name);
182 :
183 0 : static ssize_t hwirq_show(struct kobject *kobj,
184 : struct kobj_attribute *attr, char *buf)
185 : {
186 0 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
187 0 : ssize_t ret = 0;
188 :
189 0 : raw_spin_lock_irq(&desc->lock);
190 0 : if (desc->irq_data.domain)
191 0 : ret = sprintf(buf, "%d\n", (int)desc->irq_data.hwirq);
192 0 : raw_spin_unlock_irq(&desc->lock);
193 :
194 0 : return ret;
195 : }
196 : IRQ_ATTR_RO(hwirq);
197 :
198 0 : static ssize_t type_show(struct kobject *kobj,
199 : struct kobj_attribute *attr, char *buf)
200 : {
201 0 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
202 0 : ssize_t ret = 0;
203 :
204 0 : raw_spin_lock_irq(&desc->lock);
205 0 : ret = sprintf(buf, "%s\n",
206 0 : irqd_is_level_type(&desc->irq_data) ? "level" : "edge");
207 0 : raw_spin_unlock_irq(&desc->lock);
208 :
209 0 : return ret;
210 :
211 : }
212 : IRQ_ATTR_RO(type);
213 :
214 0 : static ssize_t wakeup_show(struct kobject *kobj,
215 : struct kobj_attribute *attr, char *buf)
216 : {
217 0 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
218 0 : ssize_t ret = 0;
219 :
220 0 : raw_spin_lock_irq(&desc->lock);
221 0 : ret = sprintf(buf, "%s\n",
222 0 : irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled");
223 0 : raw_spin_unlock_irq(&desc->lock);
224 :
225 0 : return ret;
226 :
227 : }
228 : IRQ_ATTR_RO(wakeup);
229 :
230 0 : static ssize_t name_show(struct kobject *kobj,
231 : struct kobj_attribute *attr, char *buf)
232 : {
233 0 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
234 0 : ssize_t ret = 0;
235 :
236 0 : raw_spin_lock_irq(&desc->lock);
237 0 : if (desc->name)
238 0 : ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);
239 0 : raw_spin_unlock_irq(&desc->lock);
240 :
241 0 : return ret;
242 : }
243 : IRQ_ATTR_RO(name);
244 :
245 0 : static ssize_t actions_show(struct kobject *kobj,
246 : struct kobj_attribute *attr, char *buf)
247 : {
248 0 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
249 0 : struct irqaction *action;
250 0 : ssize_t ret = 0;
251 0 : char *p = "";
252 :
253 0 : raw_spin_lock_irq(&desc->lock);
254 0 : for (action = desc->action; action != NULL; action = action->next) {
255 0 : ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
256 : p, action->name);
257 0 : p = ",";
258 : }
259 0 : raw_spin_unlock_irq(&desc->lock);
260 :
261 0 : if (ret)
262 0 : ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
263 :
264 0 : 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 16 : static void irq_sysfs_add(int irq, struct irq_desc *desc)
287 : {
288 16 : if (irq_kobj_base) {
289 : /*
290 : * Continue even in case of failure as this is nothing
291 : * crucial.
292 : */
293 16 : if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
294 0 : pr_warn("Failed to add kobject for irq %d\n", irq);
295 : }
296 16 : }
297 :
298 0 : 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 0 : if (irq_kobj_base)
307 0 : kobject_del(&desc->kobj);
308 : }
309 :
310 1 : static int __init irq_sysfs_init(void)
311 : {
312 1 : struct irq_desc *desc;
313 1 : int irq;
314 :
315 : /* Prevent concurrent irq alloc/free */
316 1 : irq_lock_sparse();
317 :
318 1 : irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
319 1 : if (!irq_kobj_base) {
320 0 : irq_unlock_sparse();
321 0 : return -ENOMEM;
322 : }
323 :
324 : /* Add the already allocated interrupts */
325 73 : for_each_irq_desc(irq, desc)
326 16 : irq_sysfs_add(irq, desc);
327 1 : irq_unlock_sparse();
328 :
329 1 : 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 16 : static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
347 : {
348 16 : radix_tree_insert(&irq_desc_tree, irq, desc);
349 : }
350 :
351 438 : struct irq_desc *irq_to_desc(unsigned int irq)
352 : {
353 361 : 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 0 : static void delete_irq_desc(unsigned int irq)
360 : {
361 0 : radix_tree_delete(&irq_desc_tree, irq);
362 : }
363 :
364 : #ifdef CONFIG_SMP
365 0 : static void free_masks(struct irq_desc *desc)
366 : {
367 : #ifdef CONFIG_GENERIC_PENDING_IRQ
368 0 : free_cpumask_var(desc->pending_mask);
369 : #endif
370 0 : free_cpumask_var(desc->irq_common_data.affinity);
371 : #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
372 0 : 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 7 : void irq_lock_sparse(void)
380 : {
381 7 : mutex_lock(&sparse_irq_lock);
382 6 : }
383 :
384 7 : void irq_unlock_sparse(void)
385 : {
386 7 : mutex_unlock(&sparse_irq_lock);
387 6 : }
388 :
389 16 : static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
390 : const struct cpumask *affinity,
391 : struct module *owner)
392 : {
393 16 : struct irq_desc *desc;
394 :
395 16 : desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
396 16 : if (!desc)
397 : return NULL;
398 : /* allocate based on nr_cpu_ids */
399 16 : desc->kstat_irqs = alloc_percpu(unsigned int);
400 16 : if (!desc->kstat_irqs)
401 0 : goto err_desc;
402 :
403 16 : if (alloc_masks(desc, node))
404 0 : goto err_kstat;
405 :
406 16 : raw_spin_lock_init(&desc->lock);
407 16 : lockdep_set_class(&desc->lock, &irq_desc_lock_class);
408 16 : mutex_init(&desc->request_mutex);
409 16 : init_rcu_head(&desc->rcu);
410 :
411 16 : desc_set_defaults(irq, desc, node, affinity, owner);
412 16 : irqd_set(&desc->irq_data, flags);
413 16 : kobject_init(&desc->kobj, &irq_kobj_type);
414 :
415 16 : return desc;
416 :
417 0 : err_kstat:
418 0 : free_percpu(desc->kstat_irqs);
419 0 : err_desc:
420 0 : kfree(desc);
421 0 : return NULL;
422 : }
423 :
424 0 : static void irq_kobj_release(struct kobject *kobj)
425 : {
426 0 : struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
427 :
428 0 : free_masks(desc);
429 0 : free_percpu(desc->kstat_irqs);
430 0 : kfree(desc);
431 0 : }
432 :
433 0 : static void delayed_free_desc(struct rcu_head *rhp)
434 : {
435 0 : struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
436 :
437 0 : kobject_put(&desc->kobj);
438 0 : }
439 :
440 0 : static void free_desc(unsigned int irq)
441 : {
442 0 : struct irq_desc *desc = irq_to_desc(irq);
443 :
444 0 : irq_remove_debugfs_entry(desc);
445 0 : unregister_irq_proc(irq, desc);
446 :
447 : /*
448 : * sparse_irq_lock protects also show_interrupts() and
449 : * kstat_irq_usr(). Once we deleted the descriptor from the
450 : * sparse tree we can free it. Access in proc will fail to
451 : * lookup the descriptor.
452 : *
453 : * The sysfs entry must be serialized against a concurrent
454 : * irq_sysfs_init() as well.
455 : */
456 0 : irq_sysfs_del(desc);
457 0 : delete_irq_desc(irq);
458 :
459 : /*
460 : * We free the descriptor, masks and stat fields via RCU. That
461 : * allows demultiplex interrupts to do rcu based management of
462 : * the child interrupts.
463 : * This also allows us to use rcu in kstat_irqs_usr().
464 : */
465 0 : call_rcu(&desc->rcu, delayed_free_desc);
466 0 : }
467 :
468 0 : static int alloc_descs(unsigned int start, unsigned int cnt, int node,
469 : const struct irq_affinity_desc *affinity,
470 : struct module *owner)
471 : {
472 0 : struct irq_desc *desc;
473 0 : int i;
474 :
475 : /* Validate affinity mask(s) */
476 0 : if (affinity) {
477 0 : for (i = 0; i < cnt; i++) {
478 0 : if (cpumask_empty(&affinity[i].mask))
479 : return -EINVAL;
480 : }
481 : }
482 :
483 0 : for (i = 0; i < cnt; i++) {
484 0 : const struct cpumask *mask = NULL;
485 0 : unsigned int flags = 0;
486 :
487 0 : if (affinity) {
488 0 : if (affinity->is_managed) {
489 0 : flags = IRQD_AFFINITY_MANAGED |
490 : IRQD_MANAGED_SHUTDOWN;
491 : }
492 0 : mask = &affinity->mask;
493 0 : node = cpu_to_node(cpumask_first(mask));
494 0 : affinity++;
495 : }
496 :
497 0 : desc = alloc_desc(start + i, node, flags, mask, owner);
498 0 : if (!desc)
499 0 : goto err;
500 0 : irq_insert_desc(start + i, desc);
501 0 : irq_sysfs_add(start + i, desc);
502 0 : irq_add_debugfs_entry(start + i, desc);
503 : }
504 0 : bitmap_set(allocated_irqs, start, cnt);
505 0 : return start;
506 :
507 0 : err:
508 0 : for (i--; i >= 0; i--)
509 0 : free_desc(start + i);
510 : return -ENOMEM;
511 : }
512 :
513 0 : static int irq_expand_nr_irqs(unsigned int nr)
514 : {
515 0 : if (nr > IRQ_BITMAP_BITS)
516 : return -ENOMEM;
517 0 : nr_irqs = nr;
518 0 : return 0;
519 : }
520 :
521 1 : int __init early_irq_init(void)
522 : {
523 1 : int i, initcnt, node = first_online_node;
524 1 : struct irq_desc *desc;
525 :
526 1 : init_irq_default_affinity();
527 :
528 : /* Let arch update nr_irqs and return the nr of preallocated irqs */
529 1 : initcnt = arch_probe_nr_irqs();
530 1 : printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
531 : NR_IRQS, nr_irqs, initcnt);
532 :
533 1 : if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
534 0 : nr_irqs = IRQ_BITMAP_BITS;
535 :
536 1 : if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
537 0 : initcnt = IRQ_BITMAP_BITS;
538 :
539 1 : if (initcnt > nr_irqs)
540 0 : nr_irqs = initcnt;
541 :
542 17 : for (i = 0; i < initcnt; i++) {
543 16 : desc = alloc_desc(i, node, 0, NULL, NULL);
544 16 : set_bit(i, allocated_irqs);
545 16 : irq_insert_desc(i, desc);
546 : }
547 1 : return arch_early_irq_init();
548 : }
549 :
550 : #else /* !CONFIG_SPARSE_IRQ */
551 :
552 : struct 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 :
560 : int __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 :
583 : struct irq_desc *irq_to_desc(unsigned int irq)
584 : {
585 : return (irq < NR_IRQS) ? irq_desc + irq : NULL;
586 : }
587 : EXPORT_SYMBOL(irq_to_desc);
588 :
589 : static 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 :
599 : static 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 :
614 : static int irq_expand_nr_irqs(unsigned int nr)
615 : {
616 : return -ENOMEM;
617 : }
618 :
619 : void 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
627 : void irq_init_desc(unsigned int irq)
628 : {
629 : free_desc(irq);
630 : }
631 : #endif
632 :
633 : #endif /* !CONFIG_SPARSE_IRQ */
634 :
635 : /**
636 : * generic_handle_irq - Invoke the handler for a particular irq
637 : * @irq: The irq number to handle
638 : *
639 : */
640 0 : int generic_handle_irq(unsigned int irq)
641 : {
642 0 : struct irq_desc *desc = irq_to_desc(irq);
643 0 : struct irq_data *data;
644 :
645 0 : if (!desc)
646 : return -EINVAL;
647 :
648 0 : data = irq_desc_get_irq_data(desc);
649 0 : if (WARN_ON_ONCE(!in_irq() && handle_enforce_irqctx(data)))
650 : return -EPERM;
651 :
652 0 : generic_handle_irq_desc(desc);
653 0 : return 0;
654 : }
655 : EXPORT_SYMBOL_GPL(generic_handle_irq);
656 :
657 : #ifdef CONFIG_HANDLE_DOMAIN_IRQ
658 : /**
659 : * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain
660 : * @domain: The domain where to perform the lookup
661 : * @hwirq: The HW irq number to convert to a logical one
662 : * @lookup: Whether to perform the domain lookup or not
663 : * @regs: Register file coming from the low-level handling code
664 : *
665 : * Returns: 0 on success, or -EINVAL if conversion has failed
666 : */
667 : int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
668 : bool lookup, struct pt_regs *regs)
669 : {
670 : struct pt_regs *old_regs = set_irq_regs(regs);
671 : unsigned int irq = hwirq;
672 : int ret = 0;
673 :
674 : irq_enter();
675 :
676 : #ifdef CONFIG_IRQ_DOMAIN
677 : if (lookup)
678 : irq = irq_find_mapping(domain, hwirq);
679 : #endif
680 :
681 : /*
682 : * Some hardware gives randomly wrong interrupts. Rather
683 : * than crashing, do something sensible.
684 : */
685 : if (unlikely(!irq || irq >= nr_irqs)) {
686 : ack_bad_irq(irq);
687 : ret = -EINVAL;
688 : } else {
689 : generic_handle_irq(irq);
690 : }
691 :
692 : irq_exit();
693 : set_irq_regs(old_regs);
694 : return ret;
695 : }
696 :
697 : #ifdef CONFIG_IRQ_DOMAIN
698 : /**
699 : * handle_domain_nmi - Invoke the handler for a HW irq belonging to a domain
700 : * @domain: The domain where to perform the lookup
701 : * @hwirq: The HW irq number to convert to a logical one
702 : * @regs: Register file coming from the low-level handling code
703 : *
704 : * This function must be called from an NMI context.
705 : *
706 : * Returns: 0 on success, or -EINVAL if conversion has failed
707 : */
708 : int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq,
709 : struct pt_regs *regs)
710 : {
711 : struct pt_regs *old_regs = set_irq_regs(regs);
712 : unsigned int irq;
713 : int ret = 0;
714 :
715 : /*
716 : * NMI context needs to be setup earlier in order to deal with tracing.
717 : */
718 : WARN_ON(!in_nmi());
719 :
720 : irq = irq_find_mapping(domain, hwirq);
721 :
722 : /*
723 : * ack_bad_irq is not NMI-safe, just report
724 : * an invalid interrupt.
725 : */
726 : if (likely(irq))
727 : generic_handle_irq(irq);
728 : else
729 : ret = -EINVAL;
730 :
731 : set_irq_regs(old_regs);
732 : return ret;
733 : }
734 : #endif
735 : #endif
736 :
737 : /* Dynamic interrupt handling */
738 :
739 : /**
740 : * irq_free_descs - free irq descriptors
741 : * @from: Start of descriptor range
742 : * @cnt: Number of consecutive irqs to free
743 : */
744 0 : void irq_free_descs(unsigned int from, unsigned int cnt)
745 : {
746 0 : int i;
747 :
748 0 : if (from >= nr_irqs || (from + cnt) > nr_irqs)
749 : return;
750 :
751 0 : mutex_lock(&sparse_irq_lock);
752 0 : for (i = 0; i < cnt; i++)
753 0 : free_desc(from + i);
754 :
755 0 : bitmap_clear(allocated_irqs, from, cnt);
756 0 : mutex_unlock(&sparse_irq_lock);
757 : }
758 : EXPORT_SYMBOL_GPL(irq_free_descs);
759 :
760 : /**
761 : * __irq_alloc_descs - allocate and initialize a range of irq descriptors
762 : * @irq: Allocate for specific irq number if irq >= 0
763 : * @from: Start the search from this irq number
764 : * @cnt: Number of consecutive irqs to allocate.
765 : * @node: Preferred node on which the irq descriptor should be allocated
766 : * @owner: Owning module (can be NULL)
767 : * @affinity: Optional pointer to an affinity mask array of size @cnt which
768 : * hints where the irq descriptors should be allocated and which
769 : * default affinities to use
770 : *
771 : * Returns the first irq number or error code
772 : */
773 : int __ref
774 0 : __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
775 : struct module *owner, const struct irq_affinity_desc *affinity)
776 : {
777 0 : int start, ret;
778 :
779 0 : if (!cnt)
780 : return -EINVAL;
781 :
782 0 : if (irq >= 0) {
783 0 : if (from > irq)
784 : return -EINVAL;
785 : from = irq;
786 : } else {
787 : /*
788 : * For interrupts which are freely allocated the
789 : * architecture can force a lower bound to the @from
790 : * argument. x86 uses this to exclude the GSI space.
791 : */
792 0 : from = arch_dynirq_lower_bound(from);
793 : }
794 :
795 0 : mutex_lock(&sparse_irq_lock);
796 :
797 0 : start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
798 : from, cnt, 0);
799 0 : ret = -EEXIST;
800 0 : if (irq >=0 && start != irq)
801 0 : goto unlock;
802 :
803 0 : if (start + cnt > nr_irqs) {
804 0 : ret = irq_expand_nr_irqs(start + cnt);
805 0 : if (ret)
806 0 : goto unlock;
807 : }
808 0 : ret = alloc_descs(start, cnt, node, affinity, owner);
809 0 : unlock:
810 0 : mutex_unlock(&sparse_irq_lock);
811 0 : return ret;
812 : }
813 : EXPORT_SYMBOL_GPL(__irq_alloc_descs);
814 :
815 : /**
816 : * irq_get_next_irq - get next allocated irq number
817 : * @offset: where to start the search
818 : *
819 : * Returns next irq number after offset or nr_irqs if none is found.
820 : */
821 68 : unsigned int irq_get_next_irq(unsigned int offset)
822 : {
823 68 : return find_next_bit(allocated_irqs, nr_irqs, offset);
824 : }
825 :
826 : struct irq_desc *
827 77 : __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
828 : unsigned int check)
829 : {
830 77 : struct irq_desc *desc = irq_to_desc(irq);
831 :
832 77 : if (desc) {
833 77 : if (check & _IRQ_DESC_CHECK) {
834 0 : if ((check & _IRQ_DESC_PERCPU) &&
835 0 : !irq_settings_is_per_cpu_devid(desc))
836 : return NULL;
837 :
838 0 : if (!(check & _IRQ_DESC_PERCPU) &&
839 0 : irq_settings_is_per_cpu_devid(desc))
840 : return NULL;
841 : }
842 :
843 77 : if (bus)
844 31 : chip_bus_lock(desc);
845 77 : raw_spin_lock_irqsave(&desc->lock, *flags);
846 : }
847 : return desc;
848 : }
849 :
850 77 : void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
851 : __releases(&desc->lock)
852 : {
853 77 : raw_spin_unlock_irqrestore(&desc->lock, flags);
854 77 : if (bus)
855 31 : chip_bus_sync_unlock(desc);
856 77 : }
857 :
858 0 : int irq_set_percpu_devid_partition(unsigned int irq,
859 : const struct cpumask *affinity)
860 : {
861 0 : struct irq_desc *desc = irq_to_desc(irq);
862 :
863 0 : if (!desc)
864 : return -EINVAL;
865 :
866 0 : if (desc->percpu_enabled)
867 : return -EINVAL;
868 :
869 0 : desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
870 :
871 0 : if (!desc->percpu_enabled)
872 : return -ENOMEM;
873 :
874 0 : if (affinity)
875 0 : desc->percpu_affinity = affinity;
876 : else
877 0 : desc->percpu_affinity = cpu_possible_mask;
878 :
879 0 : irq_set_percpu_devid_flags(irq);
880 0 : return 0;
881 : }
882 :
883 0 : int irq_set_percpu_devid(unsigned int irq)
884 : {
885 0 : return irq_set_percpu_devid_partition(irq, NULL);
886 : }
887 :
888 0 : int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
889 : {
890 0 : struct irq_desc *desc = irq_to_desc(irq);
891 :
892 0 : if (!desc || !desc->percpu_enabled)
893 : return -EINVAL;
894 :
895 0 : if (affinity)
896 0 : cpumask_copy(affinity, desc->percpu_affinity);
897 :
898 : return 0;
899 : }
900 : EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
901 :
902 0 : void kstat_incr_irq_this_cpu(unsigned int irq)
903 : {
904 0 : kstat_incr_irqs_this_cpu(irq_to_desc(irq));
905 0 : }
906 :
907 : /**
908 : * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
909 : * @irq: The interrupt number
910 : * @cpu: The cpu number
911 : *
912 : * Returns the sum of interrupt counts on @cpu since boot for
913 : * @irq. The caller must ensure that the interrupt is not removed
914 : * concurrently.
915 : */
916 0 : unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
917 : {
918 0 : struct irq_desc *desc = irq_to_desc(irq);
919 :
920 0 : return desc && desc->kstat_irqs ?
921 0 : *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
922 : }
923 :
924 0 : static bool irq_is_nmi(struct irq_desc *desc)
925 : {
926 0 : return desc->istate & IRQS_NMI;
927 : }
928 :
929 0 : static unsigned int kstat_irqs(unsigned int irq)
930 : {
931 0 : struct irq_desc *desc = irq_to_desc(irq);
932 0 : unsigned int sum = 0;
933 0 : int cpu;
934 :
935 0 : if (!desc || !desc->kstat_irqs)
936 : return 0;
937 0 : if (!irq_settings_is_per_cpu_devid(desc) &&
938 0 : !irq_settings_is_per_cpu(desc) &&
939 0 : !irq_is_nmi(desc))
940 0 : return data_race(desc->tot_count);
941 :
942 0 : for_each_possible_cpu(cpu)
943 0 : sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));
944 : return sum;
945 : }
946 :
947 : /**
948 : * kstat_irqs_usr - Get the statistics for an interrupt from thread context
949 : * @irq: The interrupt number
950 : *
951 : * Returns the sum of interrupt counts on all cpus since boot for @irq.
952 : *
953 : * It uses rcu to protect the access since a concurrent removal of an
954 : * interrupt descriptor is observing an rcu grace period before
955 : * delayed_free_desc()/irq_kobj_release().
956 : */
957 0 : unsigned int kstat_irqs_usr(unsigned int irq)
958 : {
959 0 : unsigned int sum;
960 :
961 0 : rcu_read_lock();
962 0 : sum = kstat_irqs(irq);
963 0 : rcu_read_unlock();
964 0 : return sum;
965 : }
966 :
967 : #ifdef CONFIG_LOCKDEP
968 0 : void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
969 : struct lock_class_key *request_class)
970 : {
971 0 : struct irq_desc *desc = irq_to_desc(irq);
972 :
973 0 : if (desc) {
974 0 : lockdep_set_class(&desc->lock, lock_class);
975 0 : lockdep_set_class(&desc->request_mutex, request_class);
976 : }
977 0 : }
978 : EXPORT_SYMBOL_GPL(__irq_set_lockdep_class);
979 : #endif
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