1 // SPDX-License-Identifier: GPL-2.0
2
3 #define pr_fmt(fmt) "irq: " fmt
4
5 #include <linux/acpi.h>
6 #include <linux/debugfs.h>
7 #include <linux/hardirq.h>
8 #include <linux/interrupt.h>
9 #include <linux/irq.h>
10 #include <linux/irqdesc.h>
11 #include <linux/irqdomain.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16 #include <linux/of_irq.h>
17 #include <linux/topology.h>
18 #include <linux/seq_file.h>
19 #include <linux/slab.h>
20 #include <linux/smp.h>
21 #include <linux/fs.h>
22
23 static LIST_HEAD(irq_domain_list);
24 static DEFINE_MUTEX(irq_domain_mutex);
25
26 static struct irq_domain *irq_default_domain;
27
28 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
29 unsigned int nr_irqs, int node, void *arg,
30 bool realloc, const struct irq_affinity_desc *affinity);
31 static void irq_domain_check_hierarchy(struct irq_domain *domain);
32 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq);
33
34 struct irqchip_fwid {
35 struct fwnode_handle fwnode;
36 unsigned int type;
37 char *name;
38 phys_addr_t *pa;
39 };
40
41 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
42 static void debugfs_add_domain_dir(struct irq_domain *d);
43 static void debugfs_remove_domain_dir(struct irq_domain *d);
44 #else
45 static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
46 static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
47 #endif
48
49 static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
50 {
51 struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
52
53 return fwid->name;
54 }
55
56 const struct fwnode_operations irqchip_fwnode_ops = {
57 .get_name = irqchip_fwnode_get_name,
58 };
59 EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
60
61 /**
62 * __irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
63 * identifying an irq domain
64 * @type: Type of irqchip_fwnode. See linux/irqdomain.h
65 * @id: Optional user provided id if name != NULL
66 * @name: Optional user provided domain name
67 * @pa: Optional user-provided physical address
68 *
69 * Allocate a struct irqchip_fwid, and return a pointer to the embedded
70 * fwnode_handle (or NULL on failure).
71 *
72 * Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
73 * solely to transport name information to irqdomain creation code. The
74 * node is not stored. For other types the pointer is kept in the irq
75 * domain struct.
76 */
77 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
78 const char *name,
79 phys_addr_t *pa)
80 {
81 struct irqchip_fwid *fwid;
82 char *n;
83
84 fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
85
86 switch (type) {
87 case IRQCHIP_FWNODE_NAMED:
88 n = kasprintf(GFP_KERNEL, "%s", name);
89 break;
90 case IRQCHIP_FWNODE_NAMED_ID:
91 n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
92 break;
93 default:
94 n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
95 break;
96 }
97
98 if (!fwid || !n) {
99 kfree(fwid);
100 kfree(n);
101 return NULL;
102 }
103
104 fwid->type = type;
105 fwid->name = n;
106 fwid->pa = pa;
107 fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
108 return &fwid->fwnode;
109 }
110 EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
111
112 /**
113 * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
114 * @fwnode: fwnode_handle to free
115 *
116 * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
117 */
118 void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
119 {
120 struct irqchip_fwid *fwid;
121
122 if (!fwnode || WARN_ON(!is_fwnode_irqchip(fwnode)))
123 return;
124
125 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
126 kfree(fwid->name);
127 kfree(fwid);
128 }
129 EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
130
131 static int irq_domain_set_name(struct irq_domain *domain,
132 const struct fwnode_handle *fwnode,
133 enum irq_domain_bus_token bus_token)
134 {
135 static atomic_t unknown_domains;
136 struct irqchip_fwid *fwid;
137
138 if (is_fwnode_irqchip(fwnode)) {
139 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
140
141 switch (fwid->type) {
142 case IRQCHIP_FWNODE_NAMED:
143 case IRQCHIP_FWNODE_NAMED_ID:
144 domain->name = bus_token ?
145 kasprintf(GFP_KERNEL, "%s-%d",
146 fwid->name, bus_token) :
147 kstrdup(fwid->name, GFP_KERNEL);
148 if (!domain->name)
149 return -ENOMEM;
150 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
151 break;
152 default:
153 domain->name = fwid->name;
154 if (bus_token) {
155 domain->name = kasprintf(GFP_KERNEL, "%s-%d",
156 fwid->name, bus_token);
157 if (!domain->name)
158 return -ENOMEM;
159 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
160 }
161 break;
162 }
163 } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
164 is_software_node(fwnode)) {
165 char *name;
166
167 /*
168 * fwnode paths contain '/', which debugfs is legitimately
169 * unhappy about. Replace them with ':', which does
170 * the trick and is not as offensive as '\'...
171 */
172 name = bus_token ?
173 kasprintf(GFP_KERNEL, "%pfw-%d", fwnode, bus_token) :
174 kasprintf(GFP_KERNEL, "%pfw", fwnode);
175 if (!name)
176 return -ENOMEM;
177
178 domain->name = strreplace(name, '/', ':');
179 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
180 }
181
182 if (!domain->name) {
183 if (fwnode)
184 pr_err("Invalid fwnode type for irqdomain\n");
185 domain->name = bus_token ?
186 kasprintf(GFP_KERNEL, "unknown-%d-%d",
187 atomic_inc_return(&unknown_domains),
188 bus_token) :
189 kasprintf(GFP_KERNEL, "unknown-%d",
190 atomic_inc_return(&unknown_domains));
191 if (!domain->name)
192 return -ENOMEM;
193 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
194 }
195
196 return 0;
197 }
198
199 static struct irq_domain *__irq_domain_create(const struct irq_domain_info *info)
200 {
201 struct irq_domain *domain;
202 int err;
203
204 if (WARN_ON((info->size && info->direct_max) ||
205 (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && info->direct_max) ||
206 (info->direct_max && info->direct_max != info->hwirq_max)))
207 return ERR_PTR(-EINVAL);
208
209 domain = kzalloc_node(struct_size(domain, revmap, info->size),
210 GFP_KERNEL, of_node_to_nid(to_of_node(info->fwnode)));
211 if (!domain)
212 return ERR_PTR(-ENOMEM);
213
214 err = irq_domain_set_name(domain, info->fwnode, info->bus_token);
215 if (err) {
216 kfree(domain);
217 return ERR_PTR(err);
218 }
219
220 domain->fwnode = fwnode_handle_get(info->fwnode);
221 fwnode_dev_initialized(domain->fwnode, true);
222
223 /* Fill structure */
224 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
225 domain->ops = info->ops;
226 domain->host_data = info->host_data;
227 domain->bus_token = info->bus_token;
228 domain->hwirq_max = info->hwirq_max;
229
230 if (info->direct_max)
231 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
232
233 domain->revmap_size = info->size;
234
235 /*
236 * Hierarchical domains use the domain lock of the root domain
237 * (innermost domain).
238 *
239 * For non-hierarchical domains (as for root domains), the root
240 * pointer is set to the domain itself so that &domain->root->mutex
241 * always points to the right lock.
242 */
243 mutex_init(&domain->mutex);
244 domain->root = domain;
245
246 irq_domain_check_hierarchy(domain);
247
248 return domain;
249 }
250
251 static void __irq_domain_publish(struct irq_domain *domain)
252 {
253 mutex_lock(&irq_domain_mutex);
254 debugfs_add_domain_dir(domain);
255 list_add(&domain->link, &irq_domain_list);
256 mutex_unlock(&irq_domain_mutex);
257
258 pr_debug("Added domain %s\n", domain->name);
259 }
260
261 static void irq_domain_free(struct irq_domain *domain)
262 {
263 fwnode_dev_initialized(domain->fwnode, false);
264 fwnode_handle_put(domain->fwnode);
265 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
266 kfree(domain->name);
267 kfree(domain);
268 }
269
270 /**
271 * irq_domain_instantiate() - Instantiate a new irq domain data structure
272 * @info: Domain information pointer pointing to the information for this domain
273 *
274 * Return: A pointer to the instantiated irq domain or an ERR_PTR value.
275 */
276 struct irq_domain *irq_domain_instantiate(const struct irq_domain_info *info)
277 {
278 struct irq_domain *domain;
279 int err;
280
281 domain = __irq_domain_create(info);
282 if (IS_ERR(domain))
283 return domain;
284
285 domain->flags |= info->domain_flags;
286 domain->exit = info->exit;
287
288 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
289 if (info->parent) {
290 domain->root = info->parent->root;
291 domain->parent = info->parent;
292 }
293 #endif
294
295 if (info->dgc_info) {
296 err = irq_domain_alloc_generic_chips(domain, info->dgc_info);
297 if (err)
298 goto err_domain_free;
299 }
300
301 if (info->init) {
302 err = info->init(domain);
303 if (err)
304 goto err_domain_gc_remove;
305 }
306
307 __irq_domain_publish(domain);
308
309 return domain;
310
311 err_domain_gc_remove:
312 if (info->dgc_info)
313 irq_domain_remove_generic_chips(domain);
314 err_domain_free:
315 irq_domain_free(domain);
316 return ERR_PTR(err);
317 }
318 EXPORT_SYMBOL_GPL(irq_domain_instantiate);
319
320 /**
321 * irq_domain_remove() - Remove an irq domain.
322 * @domain: domain to remove
323 *
324 * This routine is used to remove an irq domain. The caller must ensure
325 * that all mappings within the domain have been disposed of prior to
326 * use, depending on the revmap type.
327 */
328 void irq_domain_remove(struct irq_domain *domain)
329 {
330 if (domain->exit)
331 domain->exit(domain);
332
333 mutex_lock(&irq_domain_mutex);
334 debugfs_remove_domain_dir(domain);
335
336 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
337
338 list_del(&domain->link);
339
340 /*
341 * If the going away domain is the default one, reset it.
342 */
343 if (unlikely(irq_default_domain == domain))
344 irq_set_default_host(NULL);
345
346 mutex_unlock(&irq_domain_mutex);
347
348 if (domain->flags & IRQ_DOMAIN_FLAG_DESTROY_GC)
349 irq_domain_remove_generic_chips(domain);
350
351 pr_debug("Removed domain %s\n", domain->name);
352 irq_domain_free(domain);
353 }
354 EXPORT_SYMBOL_GPL(irq_domain_remove);
355
356 void irq_domain_update_bus_token(struct irq_domain *domain,
357 enum irq_domain_bus_token bus_token)
358 {
359 char *name;
360
361 if (domain->bus_token == bus_token)
362 return;
363
364 mutex_lock(&irq_domain_mutex);
365
366 domain->bus_token = bus_token;
367
368 name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
369 if (!name) {
370 mutex_unlock(&irq_domain_mutex);
371 return;
372 }
373
374 debugfs_remove_domain_dir(domain);
375
376 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
377 kfree(domain->name);
378 else
379 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
380
381 domain->name = name;
382 debugfs_add_domain_dir(domain);
383
384 mutex_unlock(&irq_domain_mutex);
385 }
386 EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
387
388 /**
389 * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
390 * @fwnode: firmware node for the interrupt controller
391 * @size: total number of irqs in mapping
392 * @first_irq: first number of irq block assigned to the domain,
393 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
394 * pre-map all of the irqs in the domain to virqs starting at first_irq.
395 * @ops: domain callbacks
396 * @host_data: Controller private data pointer
397 *
398 * Allocates an irq_domain, and optionally if first_irq is positive then also
399 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
400 *
401 * This is intended to implement the expected behaviour for most
402 * interrupt controllers. If device tree is used, then first_irq will be 0 and
403 * irqs get mapped dynamically on the fly. However, if the controller requires
404 * static virq assignments (non-DT boot) then it will set that up correctly.
405 */
406 struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
407 unsigned int size,
408 unsigned int first_irq,
409 const struct irq_domain_ops *ops,
410 void *host_data)
411 {
412 struct irq_domain_info info = {
413 .fwnode = fwnode,
414 .size = size,
415 .hwirq_max = size,
416 .ops = ops,
417 .host_data = host_data,
418 };
419 struct irq_domain *domain;
420
421 domain = irq_domain_instantiate(&info);
422 if (IS_ERR(domain))
423 return NULL;
424
425 if (first_irq > 0) {
426 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
427 /* attempt to allocated irq_descs */
428 int rc = irq_alloc_descs(first_irq, first_irq, size,
429 of_node_to_nid(to_of_node(fwnode)));
430 if (rc < 0)
431 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
432 first_irq);
433 }
434 irq_domain_associate_many(domain, first_irq, 0, size);
435 }
436
437 return domain;
438 }
439 EXPORT_SYMBOL_GPL(irq_domain_create_simple);
440
441 /**
442 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
443 * @of_node: pointer to interrupt controller's device tree node.
444 * @size: total number of irqs in legacy mapping
445 * @first_irq: first number of irq block assigned to the domain
446 * @first_hwirq: first hwirq number to use for the translation. Should normally
447 * be '', but a positive integer can be used if the effective
448 * hwirqs numbering does not begin at zero.
449 * @ops: map/unmap domain callbacks
450 * @host_data: Controller private data pointer
451 *
452 * Note: the map() callback will be called before this function returns
453 * for all legacy interrupts except 0 (which is always the invalid irq for
454 * a legacy controller).
455 */
456 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
457 unsigned int size,
458 unsigned int first_irq,
459 irq_hw_number_t first_hwirq,
460 const struct irq_domain_ops *ops,
461 void *host_data)
462 {
463 return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
464 first_irq, first_hwirq, ops, host_data);
465 }
466 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
467
468 struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
469 unsigned int size,
470 unsigned int first_irq,
471 irq_hw_number_t first_hwirq,
472 const struct irq_domain_ops *ops,
473 void *host_data)
474 {
475 struct irq_domain_info info = {
476 .fwnode = fwnode,
477 .size = first_hwirq + size,
478 .hwirq_max = first_hwirq + size,
479 .ops = ops,
480 .host_data = host_data,
481 };
482 struct irq_domain *domain;
483
484 domain = irq_domain_instantiate(&info);
485 if (IS_ERR(domain))
486 return NULL;
487
488 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
489
490 return domain;
491 }
492 EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
493
494 /**
495 * irq_find_matching_fwspec() - Locates a domain for a given fwspec
496 * @fwspec: FW specifier for an interrupt
497 * @bus_token: domain-specific data
498 */
499 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
500 enum irq_domain_bus_token bus_token)
501 {
502 struct irq_domain *h, *found = NULL;
503 struct fwnode_handle *fwnode = fwspec->fwnode;
504 int rc;
505
506 /*
507 * We might want to match the legacy controller last since
508 * it might potentially be set to match all interrupts in
509 * the absence of a device node. This isn't a problem so far
510 * yet though...
511 *
512 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
513 * values must generate an exact match for the domain to be
514 * selected.
515 */
516 mutex_lock(&irq_domain_mutex);
517 list_for_each_entry(h, &irq_domain_list, link) {
518 if (h->ops->select && bus_token != DOMAIN_BUS_ANY)
519 rc = h->ops->select(h, fwspec, bus_token);
520 else if (h->ops->match)
521 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
522 else
523 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
524 ((bus_token == DOMAIN_BUS_ANY) ||
525 (h->bus_token == bus_token)));
526
527 if (rc) {
528 found = h;
529 break;
530 }
531 }
532 mutex_unlock(&irq_domain_mutex);
533 return found;
534 }
535 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
536
537 /**
538 * irq_set_default_host() - Set a "default" irq domain
539 * @domain: default domain pointer
540 *
541 * For convenience, it's possible to set a "default" domain that will be used
542 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
543 * platforms that want to manipulate a few hard coded interrupt numbers that
544 * aren't properly represented in the device-tree.
545 */
546 void irq_set_default_host(struct irq_domain *domain)
547 {
548 pr_debug("Default domain set to @0x%p\n", domain);
549
550 irq_default_domain = domain;
551 }
552 EXPORT_SYMBOL_GPL(irq_set_default_host);
553
554 /**
555 * irq_get_default_host() - Retrieve the "default" irq domain
556 *
557 * Returns: the default domain, if any.
558 *
559 * Modern code should never use this. This should only be used on
560 * systems that cannot implement a firmware->fwnode mapping (which
561 * both DT and ACPI provide).
562 */
563 struct irq_domain *irq_get_default_host(void)
564 {
565 return irq_default_domain;
566 }
567 EXPORT_SYMBOL_GPL(irq_get_default_host);
568
569 static bool irq_domain_is_nomap(struct irq_domain *domain)
570 {
571 return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
572 (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
573 }
574
575 static void irq_domain_clear_mapping(struct irq_domain *domain,
576 irq_hw_number_t hwirq)
577 {
578 lockdep_assert_held(&domain->root->mutex);
579
580 if (irq_domain_is_nomap(domain))
581 return;
582
583 if (hwirq < domain->revmap_size)
584 rcu_assign_pointer(domain->revmap[hwirq], NULL);
585 else
586 radix_tree_delete(&domain->revmap_tree, hwirq);
587 }
588
589 static void irq_domain_set_mapping(struct irq_domain *domain,
590 irq_hw_number_t hwirq,
591 struct irq_data *irq_data)
592 {
593 /*
594 * This also makes sure that all domains point to the same root when
595 * called from irq_domain_insert_irq() for each domain in a hierarchy.
596 */
597 lockdep_assert_held(&domain->root->mutex);
598
599 if (irq_domain_is_nomap(domain))
600 return;
601
602 if (hwirq < domain->revmap_size)
603 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
604 else
605 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
606 }
607
608 static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
609 {
610 struct irq_data *irq_data = irq_get_irq_data(irq);
611 irq_hw_number_t hwirq;
612
613 if (WARN(!irq_data || irq_data->domain != domain,
614 "virq%i doesn't exist; cannot disassociate\n", irq))
615 return;
616
617 hwirq = irq_data->hwirq;
618
619 mutex_lock(&domain->root->mutex);
620
621 irq_set_status_flags(irq, IRQ_NOREQUEST);
622
623 /* remove chip and handler */
624 irq_set_chip_and_handler(irq, NULL, NULL);
625
626 /* Make sure it's completed */
627 synchronize_irq(irq);
628
629 /* Tell the PIC about it */
630 if (domain->ops->unmap)
631 domain->ops->unmap(domain, irq);
632 smp_mb();
633
634 irq_data->domain = NULL;
635 irq_data->hwirq = 0;
636 domain->mapcount--;
637
638 /* Clear reverse map for this hwirq */
639 irq_domain_clear_mapping(domain, hwirq);
640
641 mutex_unlock(&domain->root->mutex);
642 }
643
644 static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
645 irq_hw_number_t hwirq)
646 {
647 struct irq_data *irq_data = irq_get_irq_data(virq);
648 int ret;
649
650 if (WARN(hwirq >= domain->hwirq_max,
651 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
652 return -EINVAL;
653 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
654 return -EINVAL;
655 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
656 return -EINVAL;
657
658 irq_data->hwirq = hwirq;
659 irq_data->domain = domain;
660 if (domain->ops->map) {
661 ret = domain->ops->map(domain, virq, hwirq);
662 if (ret != 0) {
663 /*
664 * If map() returns -EPERM, this interrupt is protected
665 * by the firmware or some other service and shall not
666 * be mapped. Don't bother telling the user about it.
667 */
668 if (ret != -EPERM) {
669 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
670 domain->name, hwirq, virq, ret);
671 }
672 irq_data->domain = NULL;
673 irq_data->hwirq = 0;
674 return ret;
675 }
676 }
677
678 domain->mapcount++;
679 irq_domain_set_mapping(domain, hwirq, irq_data);
680
681 irq_clear_status_flags(virq, IRQ_NOREQUEST);
682
683 return 0;
684 }
685
686 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
687 irq_hw_number_t hwirq)
688 {
689 int ret;
690
691 mutex_lock(&domain->root->mutex);
692 ret = irq_domain_associate_locked(domain, virq, hwirq);
693 mutex_unlock(&domain->root->mutex);
694
695 return ret;
696 }
697 EXPORT_SYMBOL_GPL(irq_domain_associate);
698
699 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
700 irq_hw_number_t hwirq_base, int count)
701 {
702 struct device_node *of_node;
703 int i;
704
705 of_node = irq_domain_get_of_node(domain);
706 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
707 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
708
709 for (i = 0; i < count; i++)
710 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
711 }
712 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
713
714 #ifdef CONFIG_IRQ_DOMAIN_NOMAP
715 /**
716 * irq_create_direct_mapping() - Allocate an irq for direct mapping
717 * @domain: domain to allocate the irq for or NULL for default domain
718 *
719 * This routine is used for irq controllers which can choose the hardware
720 * interrupt numbers they generate. In such a case it's simplest to use
721 * the linux irq as the hardware interrupt number. It still uses the linear
722 * or radix tree to store the mapping, but the irq controller can optimize
723 * the revmap path by using the hwirq directly.
724 */
725 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
726 {
727 struct device_node *of_node;
728 unsigned int virq;
729
730 if (domain == NULL)
731 domain = irq_default_domain;
732
733 of_node = irq_domain_get_of_node(domain);
734 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
735 if (!virq) {
736 pr_debug("create_direct virq allocation failed\n");
737 return 0;
738 }
739 if (virq >= domain->hwirq_max) {
740 pr_err("ERROR: no free irqs available below %lu maximum\n",
741 domain->hwirq_max);
742 irq_free_desc(virq);
743 return 0;
744 }
745 pr_debug("create_direct obtained virq %d\n", virq);
746
747 if (irq_domain_associate(domain, virq, virq)) {
748 irq_free_desc(virq);
749 return 0;
750 }
751
752 return virq;
753 }
754 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
755 #endif
756
757 static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
758 irq_hw_number_t hwirq,
759 const struct irq_affinity_desc *affinity)
760 {
761 struct device_node *of_node = irq_domain_get_of_node(domain);
762 int virq;
763
764 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
765
766 /* Allocate a virtual interrupt number */
767 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
768 affinity);
769 if (virq <= 0) {
770 pr_debug("-> virq allocation failed\n");
771 return 0;
772 }
773
774 if (irq_domain_associate_locked(domain, virq, hwirq)) {
775 irq_free_desc(virq);
776 return 0;
777 }
778
779 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
780 hwirq, of_node_full_name(of_node), virq);
781
782 return virq;
783 }
784
785 /**
786 * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
787 * @domain: domain owning this hardware interrupt or NULL for default domain
788 * @hwirq: hardware irq number in that domain space
789 * @affinity: irq affinity
790 *
791 * Only one mapping per hardware interrupt is permitted. Returns a linux
792 * irq number.
793 * If the sense/trigger is to be specified, set_irq_type() should be called
794 * on the number returned from that call.
795 */
796 unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
797 irq_hw_number_t hwirq,
798 const struct irq_affinity_desc *affinity)
799 {
800 int virq;
801
802 /* Look for default domain if necessary */
803 if (domain == NULL)
804 domain = irq_default_domain;
805 if (domain == NULL) {
806 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
807 return 0;
808 }
809
810 mutex_lock(&domain->root->mutex);
811
812 /* Check if mapping already exists */
813 virq = irq_find_mapping(domain, hwirq);
814 if (virq) {
815 pr_debug("existing mapping on virq %d\n", virq);
816 goto out;
817 }
818
819 virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
820 out:
821 mutex_unlock(&domain->root->mutex);
822
823 return virq;
824 }
825 EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
826
827 static int irq_domain_translate(struct irq_domain *d,
828 struct irq_fwspec *fwspec,
829 irq_hw_number_t *hwirq, unsigned int *type)
830 {
831 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
832 if (d->ops->translate)
833 return d->ops->translate(d, fwspec, hwirq, type);
834 #endif
835 if (d->ops->xlate)
836 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
837 fwspec->param, fwspec->param_count,
838 hwirq, type);
839
840 /* If domain has no translation, then we assume interrupt line */
841 *hwirq = fwspec->param[0];
842 return 0;
843 }
844
845 void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
846 unsigned int count, struct irq_fwspec *fwspec)
847 {
848 int i;
849
850 fwspec->fwnode = of_node_to_fwnode(np);
851 fwspec->param_count = count;
852
853 for (i = 0; i < count; i++)
854 fwspec->param[i] = args[i];
855 }
856 EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
857
858 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
859 {
860 struct irq_domain *domain;
861 struct irq_data *irq_data;
862 irq_hw_number_t hwirq;
863 unsigned int type = IRQ_TYPE_NONE;
864 int virq;
865
866 if (fwspec->fwnode) {
867 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
868 if (!domain)
869 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
870 } else {
871 domain = irq_default_domain;
872 }
873
874 if (!domain) {
875 pr_warn("no irq domain found for %s !\n",
876 of_node_full_name(to_of_node(fwspec->fwnode)));
877 return 0;
878 }
879
880 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
881 return 0;
882
883 /*
884 * WARN if the irqchip returns a type with bits
885 * outside the sense mask set and clear these bits.
886 */
887 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
888 type &= IRQ_TYPE_SENSE_MASK;
889
890 mutex_lock(&domain->root->mutex);
891
892 /*
893 * If we've already configured this interrupt,
894 * don't do it again, or hell will break loose.
895 */
896 virq = irq_find_mapping(domain, hwirq);
897 if (virq) {
898 /*
899 * If the trigger type is not specified or matches the
900 * current trigger type then we are done so return the
901 * interrupt number.
902 */
903 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
904 goto out;
905
906 /*
907 * If the trigger type has not been set yet, then set
908 * it now and return the interrupt number.
909 */
910 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
911 irq_data = irq_get_irq_data(virq);
912 if (!irq_data) {
913 virq = 0;
914 goto out;
915 }
916
917 irqd_set_trigger_type(irq_data, type);
918 goto out;
919 }
920
921 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
922 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
923 virq = 0;
924 goto out;
925 }
926
927 if (irq_domain_is_hierarchy(domain)) {
928 if (irq_domain_is_msi_device(domain)) {
929 mutex_unlock(&domain->root->mutex);
930 virq = msi_device_domain_alloc_wired(domain, hwirq, type);
931 mutex_lock(&domain->root->mutex);
932 } else
933 virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
934 fwspec, false, NULL);
935 if (virq <= 0) {
936 virq = 0;
937 goto out;
938 }
939 } else {
940 /* Create mapping */
941 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
942 if (!virq)
943 goto out;
944 }
945
946 irq_data = irq_get_irq_data(virq);
947 if (WARN_ON(!irq_data)) {
948 virq = 0;
949 goto out;
950 }
951
952 /* Store trigger type */
953 irqd_set_trigger_type(irq_data, type);
954 out:
955 mutex_unlock(&domain->root->mutex);
956
957 return virq;
958 }
959 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
960
961 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
962 {
963 struct irq_fwspec fwspec;
964
965 of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
966 irq_data->args_count, &fwspec);
967
968 return irq_create_fwspec_mapping(&fwspec);
969 }
970 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
971
972 /**
973 * irq_dispose_mapping() - Unmap an interrupt
974 * @virq: linux irq number of the interrupt to unmap
975 */
976 void irq_dispose_mapping(unsigned int virq)
977 {
978 struct irq_data *irq_data;
979 struct irq_domain *domain;
980
981 irq_data = virq ? irq_get_irq_data(virq) : NULL;
982 if (!irq_data)
983 return;
984
985 domain = irq_data->domain;
986 if (WARN_ON(domain == NULL))
987 return;
988
989 if (irq_domain_is_hierarchy(domain)) {
990 irq_domain_free_one_irq(domain, virq);
991 } else {
992 irq_domain_disassociate(domain, virq);
993 irq_free_desc(virq);
994 }
995 }
996 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
997
998 /**
999 * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
1000 * @domain: domain owning this hardware interrupt
1001 * @hwirq: hardware irq number in that domain space
1002 * @irq: optional pointer to return the Linux irq if required
1003 *
1004 * Returns the interrupt descriptor.
1005 */
1006 struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
1007 irq_hw_number_t hwirq,
1008 unsigned int *irq)
1009 {
1010 struct irq_desc *desc = NULL;
1011 struct irq_data *data;
1012
1013 /* Look for default domain if necessary */
1014 if (domain == NULL)
1015 domain = irq_default_domain;
1016 if (domain == NULL)
1017 return desc;
1018
1019 if (irq_domain_is_nomap(domain)) {
1020 if (hwirq < domain->hwirq_max) {
1021 data = irq_domain_get_irq_data(domain, hwirq);
1022 if (data && data->hwirq == hwirq)
1023 desc = irq_data_to_desc(data);
1024 if (irq && desc)
1025 *irq = hwirq;
1026 }
1027
1028 return desc;
1029 }
1030
1031 rcu_read_lock();
1032 /* Check if the hwirq is in the linear revmap. */
1033 if (hwirq < domain->revmap_size)
1034 data = rcu_dereference(domain->revmap[hwirq]);
1035 else
1036 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
1037
1038 if (likely(data)) {
1039 desc = irq_data_to_desc(data);
1040 if (irq)
1041 *irq = data->irq;
1042 }
1043
1044 rcu_read_unlock();
1045 return desc;
1046 }
1047 EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
1048
1049 /**
1050 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
1051 * @d: Interrupt domain involved in the translation
1052 * @ctrlr: The device tree node for the device whose interrupt is translated
1053 * @intspec: The interrupt specifier data from the device tree
1054 * @intsize: The number of entries in @intspec
1055 * @out_hwirq: Pointer to storage for the hardware interrupt number
1056 * @out_type: Pointer to storage for the interrupt type
1057 *
1058 * Device Tree IRQ specifier translation function which works with one cell
1059 * bindings where the cell value maps directly to the hwirq number.
1060 */
1061 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
1062 const u32 *intspec, unsigned int intsize,
1063 unsigned long *out_hwirq, unsigned int *out_type)
1064 {
1065 if (WARN_ON(intsize < 1))
1066 return -EINVAL;
1067 *out_hwirq = intspec[0];
1068 *out_type = IRQ_TYPE_NONE;
1069 return 0;
1070 }
1071 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
1072
1073 /**
1074 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1075 * @d: Interrupt domain involved in the translation
1076 * @ctrlr: The device tree node for the device whose interrupt is translated
1077 * @intspec: The interrupt specifier data from the device tree
1078 * @intsize: The number of entries in @intspec
1079 * @out_hwirq: Pointer to storage for the hardware interrupt number
1080 * @out_type: Pointer to storage for the interrupt type
1081 *
1082 * Device Tree IRQ specifier translation function which works with two cell
1083 * bindings where the cell values map directly to the hwirq number
1084 * and linux irq flags.
1085 */
1086 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1087 const u32 *intspec, unsigned int intsize,
1088 irq_hw_number_t *out_hwirq, unsigned int *out_type)
1089 {
1090 struct irq_fwspec fwspec;
1091
1092 of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1093 return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1094 }
1095 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1096
1097 /**
1098 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1099 * @d: Interrupt domain involved in the translation
1100 * @ctrlr: The device tree node for the device whose interrupt is translated
1101 * @intspec: The interrupt specifier data from the device tree
1102 * @intsize: The number of entries in @intspec
1103 * @out_hwirq: Pointer to storage for the hardware interrupt number
1104 * @out_type: Pointer to storage for the interrupt type
1105 *
1106 * Device Tree IRQ specifier translation function which works with either one
1107 * or two cell bindings where the cell values map directly to the hwirq number
1108 * and linux irq flags.
1109 *
1110 * Note: don't use this function unless your interrupt controller explicitly
1111 * supports both one and two cell bindings. For the majority of controllers
1112 * the _onecell() or _twocell() variants above should be used.
1113 */
1114 int irq_domain_xlate_onetwocell(struct irq_domain *d,
1115 struct device_node *ctrlr,
1116 const u32 *intspec, unsigned int intsize,
1117 unsigned long *out_hwirq, unsigned int *out_type)
1118 {
1119 if (WARN_ON(intsize < 1))
1120 return -EINVAL;
1121 *out_hwirq = intspec[0];
1122 if (intsize > 1)
1123 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1124 else
1125 *out_type = IRQ_TYPE_NONE;
1126 return 0;
1127 }
1128 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1129
1130 const struct irq_domain_ops irq_domain_simple_ops = {
1131 .xlate = irq_domain_xlate_onetwocell,
1132 };
1133 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1134
1135 /**
1136 * irq_domain_translate_onecell() - Generic translate for direct one cell
1137 * bindings
1138 * @d: Interrupt domain involved in the translation
1139 * @fwspec: The firmware interrupt specifier to translate
1140 * @out_hwirq: Pointer to storage for the hardware interrupt number
1141 * @out_type: Pointer to storage for the interrupt type
1142 */
1143 int irq_domain_translate_onecell(struct irq_domain *d,
1144 struct irq_fwspec *fwspec,
1145 unsigned long *out_hwirq,
1146 unsigned int *out_type)
1147 {
1148 if (WARN_ON(fwspec->param_count < 1))
1149 return -EINVAL;
1150 *out_hwirq = fwspec->param[0];
1151 *out_type = IRQ_TYPE_NONE;
1152 return 0;
1153 }
1154 EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1155
1156 /**
1157 * irq_domain_translate_twocell() - Generic translate for direct two cell
1158 * bindings
1159 * @d: Interrupt domain involved in the translation
1160 * @fwspec: The firmware interrupt specifier to translate
1161 * @out_hwirq: Pointer to storage for the hardware interrupt number
1162 * @out_type: Pointer to storage for the interrupt type
1163 *
1164 * Device Tree IRQ specifier translation function which works with two cell
1165 * bindings where the cell values map directly to the hwirq number
1166 * and linux irq flags.
1167 */
1168 int irq_domain_translate_twocell(struct irq_domain *d,
1169 struct irq_fwspec *fwspec,
1170 unsigned long *out_hwirq,
1171 unsigned int *out_type)
1172 {
1173 if (WARN_ON(fwspec->param_count < 2))
1174 return -EINVAL;
1175 *out_hwirq = fwspec->param[0];
1176 *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1177 return 0;
1178 }
1179 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1180
1181 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1182 int node, const struct irq_affinity_desc *affinity)
1183 {
1184 unsigned int hint;
1185
1186 if (virq >= 0) {
1187 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1188 affinity);
1189 } else {
1190 hint = hwirq % nr_irqs;
1191 if (hint == 0)
1192 hint++;
1193 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1194 affinity);
1195 if (virq <= 0 && hint > 1) {
1196 virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1197 affinity);
1198 }
1199 }
1200
1201 return virq;
1202 }
1203
1204 /**
1205 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1206 * @irq_data: The pointer to irq_data
1207 */
1208 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1209 {
1210 irq_data->hwirq = 0;
1211 irq_data->chip = &no_irq_chip;
1212 irq_data->chip_data = NULL;
1213 }
1214 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1215
1216 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1217 /**
1218 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1219 * @parent: Parent irq domain to associate with the new domain
1220 * @flags: Irq domain flags associated to the domain
1221 * @size: Size of the domain. See below
1222 * @fwnode: Optional fwnode of the interrupt controller
1223 * @ops: Pointer to the interrupt domain callbacks
1224 * @host_data: Controller private data pointer
1225 *
1226 * If @size is 0 a tree domain is created, otherwise a linear domain.
1227 *
1228 * If successful the parent is associated to the new domain and the
1229 * domain flags are set.
1230 * Returns pointer to IRQ domain, or NULL on failure.
1231 */
1232 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1233 unsigned int flags,
1234 unsigned int size,
1235 struct fwnode_handle *fwnode,
1236 const struct irq_domain_ops *ops,
1237 void *host_data)
1238 {
1239 struct irq_domain_info info = {
1240 .fwnode = fwnode,
1241 .size = size,
1242 .hwirq_max = size,
1243 .ops = ops,
1244 .host_data = host_data,
1245 .domain_flags = flags,
1246 .parent = parent,
1247 };
1248 struct irq_domain *d;
1249
1250 if (!info.size)
1251 info.hwirq_max = ~0U;
1252
1253 d = irq_domain_instantiate(&info);
1254 return IS_ERR(d) ? NULL : d;
1255 }
1256 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1257
1258 static void irq_domain_insert_irq(int virq)
1259 {
1260 struct irq_data *data;
1261
1262 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1263 struct irq_domain *domain = data->domain;
1264
1265 domain->mapcount++;
1266 irq_domain_set_mapping(domain, data->hwirq, data);
1267 }
1268
1269 irq_clear_status_flags(virq, IRQ_NOREQUEST);
1270 }
1271
1272 static void irq_domain_remove_irq(int virq)
1273 {
1274 struct irq_data *data;
1275
1276 irq_set_status_flags(virq, IRQ_NOREQUEST);
1277 irq_set_chip_and_handler(virq, NULL, NULL);
1278 synchronize_irq(virq);
1279 smp_mb();
1280
1281 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1282 struct irq_domain *domain = data->domain;
1283 irq_hw_number_t hwirq = data->hwirq;
1284
1285 domain->mapcount--;
1286 irq_domain_clear_mapping(domain, hwirq);
1287 }
1288 }
1289
1290 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1291 struct irq_data *child)
1292 {
1293 struct irq_data *irq_data;
1294
1295 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1296 irq_data_get_node(child));
1297 if (irq_data) {
1298 child->parent_data = irq_data;
1299 irq_data->irq = child->irq;
1300 irq_data->common = child->common;
1301 irq_data->domain = domain;
1302 }
1303
1304 return irq_data;
1305 }
1306
1307 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1308 {
1309 struct irq_data *tmp;
1310
1311 while (irq_data) {
1312 tmp = irq_data;
1313 irq_data = irq_data->parent_data;
1314 kfree(tmp);
1315 }
1316 }
1317
1318 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1319 {
1320 struct irq_data *irq_data, *tmp;
1321 int i;
1322
1323 for (i = 0; i < nr_irqs; i++) {
1324 irq_data = irq_get_irq_data(virq + i);
1325 tmp = irq_data->parent_data;
1326 irq_data->parent_data = NULL;
1327 irq_data->domain = NULL;
1328
1329 __irq_domain_free_hierarchy(tmp);
1330 }
1331 }
1332
1333 /**
1334 * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1335 * @domain: IRQ domain from which the hierarchy is to be disconnected
1336 * @virq: IRQ number where the hierarchy is to be trimmed
1337 *
1338 * Marks the @virq level belonging to @domain as disconnected.
1339 * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1340 * to @domain.
1341 *
1342 * Its only use is to be able to trim levels of hierarchy that do not
1343 * have any real meaning for this interrupt, and that the driver marks
1344 * as such from its .alloc() callback.
1345 */
1346 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1347 unsigned int virq)
1348 {
1349 struct irq_data *irqd;
1350
1351 irqd = irq_domain_get_irq_data(domain, virq);
1352 if (!irqd)
1353 return -EINVAL;
1354
1355 irqd->chip = ERR_PTR(-ENOTCONN);
1356 return 0;
1357 }
1358 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1359
1360 static int irq_domain_trim_hierarchy(unsigned int virq)
1361 {
1362 struct irq_data *tail, *irqd, *irq_data;
1363
1364 irq_data = irq_get_irq_data(virq);
1365 tail = NULL;
1366
1367 /* The first entry must have a valid irqchip */
1368 if (!irq_data->chip || IS_ERR(irq_data->chip))
1369 return -EINVAL;
1370
1371 /*
1372 * Validate that the irq_data chain is sane in the presence of
1373 * a hierarchy trimming marker.
1374 */
1375 for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1376 /* Can't have a valid irqchip after a trim marker */
1377 if (irqd->chip && tail)
1378 return -EINVAL;
1379
1380 /* Can't have an empty irqchip before a trim marker */
1381 if (!irqd->chip && !tail)
1382 return -EINVAL;
1383
1384 if (IS_ERR(irqd->chip)) {
1385 /* Only -ENOTCONN is a valid trim marker */
1386 if (PTR_ERR(irqd->chip) != -ENOTCONN)
1387 return -EINVAL;
1388
1389 tail = irq_data;
1390 }
1391 }
1392
1393 /* No trim marker, nothing to do */
1394 if (!tail)
1395 return 0;
1396
1397 pr_info("IRQ%d: trimming hierarchy from %s\n",
1398 virq, tail->parent_data->domain->name);
1399
1400 /* Sever the inner part of the hierarchy... */
1401 irqd = tail;
1402 tail = tail->parent_data;
1403 irqd->parent_data = NULL;
1404 __irq_domain_free_hierarchy(tail);
1405
1406 return 0;
1407 }
1408
1409 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1410 unsigned int virq, unsigned int nr_irqs)
1411 {
1412 struct irq_data *irq_data;
1413 struct irq_domain *parent;
1414 int i;
1415
1416 /* The outermost irq_data is embedded in struct irq_desc */
1417 for (i = 0; i < nr_irqs; i++) {
1418 irq_data = irq_get_irq_data(virq + i);
1419 irq_data->domain = domain;
1420
1421 for (parent = domain->parent; parent; parent = parent->parent) {
1422 irq_data = irq_domain_insert_irq_data(parent, irq_data);
1423 if (!irq_data) {
1424 irq_domain_free_irq_data(virq, i + 1);
1425 return -ENOMEM;
1426 }
1427 }
1428 }
1429
1430 return 0;
1431 }
1432
1433 /**
1434 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1435 * @domain: domain to match
1436 * @virq: IRQ number to get irq_data
1437 */
1438 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1439 unsigned int virq)
1440 {
1441 struct irq_data *irq_data;
1442
1443 for (irq_data = irq_get_irq_data(virq); irq_data;
1444 irq_data = irq_data->parent_data)
1445 if (irq_data->domain == domain)
1446 return irq_data;
1447
1448 return NULL;
1449 }
1450 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1451
1452 /**
1453 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1454 * @domain: Interrupt domain to match
1455 * @virq: IRQ number
1456 * @hwirq: The hwirq number
1457 * @chip: The associated interrupt chip
1458 * @chip_data: The associated chip data
1459 */
1460 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1461 irq_hw_number_t hwirq,
1462 const struct irq_chip *chip,
1463 void *chip_data)
1464 {
1465 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1466
1467 if (!irq_data)
1468 return -ENOENT;
1469
1470 irq_data->hwirq = hwirq;
1471 irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1472 irq_data->chip_data = chip_data;
1473
1474 return 0;
1475 }
1476 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1477
1478 /**
1479 * irq_domain_set_info - Set the complete data for a @virq in @domain
1480 * @domain: Interrupt domain to match
1481 * @virq: IRQ number
1482 * @hwirq: The hardware interrupt number
1483 * @chip: The associated interrupt chip
1484 * @chip_data: The associated interrupt chip data
1485 * @handler: The interrupt flow handler
1486 * @handler_data: The interrupt flow handler data
1487 * @handler_name: The interrupt handler name
1488 */
1489 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1490 irq_hw_number_t hwirq, const struct irq_chip *chip,
1491 void *chip_data, irq_flow_handler_t handler,
1492 void *handler_data, const char *handler_name)
1493 {
1494 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1495 __irq_set_handler(virq, handler, 0, handler_name);
1496 irq_set_handler_data(virq, handler_data);
1497 }
1498 EXPORT_SYMBOL(irq_domain_set_info);
1499
1500 /**
1501 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1502 * @domain: Interrupt domain to match
1503 * @virq: IRQ number to start with
1504 * @nr_irqs: The number of irqs to free
1505 */
1506 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1507 unsigned int nr_irqs)
1508 {
1509 struct irq_data *irq_data;
1510 int i;
1511
1512 for (i = 0; i < nr_irqs; i++) {
1513 irq_data = irq_domain_get_irq_data(domain, virq + i);
1514 if (irq_data)
1515 irq_domain_reset_irq_data(irq_data);
1516 }
1517 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1518 }
1519 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1520
1521 /**
1522 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1523 * @domain: Interrupt domain to match
1524 * @virq: IRQ number to start with
1525 * @nr_irqs: The number of irqs to free
1526 */
1527 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1528 unsigned int nr_irqs)
1529 {
1530 int i;
1531
1532 for (i = 0; i < nr_irqs; i++) {
1533 irq_set_handler_data(virq + i, NULL);
1534 irq_set_handler(virq + i, NULL);
1535 }
1536 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1537 }
1538
1539 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1540 unsigned int irq_base,
1541 unsigned int nr_irqs)
1542 {
1543 unsigned int i;
1544
1545 if (!domain->ops->free)
1546 return;
1547
1548 for (i = 0; i < nr_irqs; i++) {
1549 if (irq_domain_get_irq_data(domain, irq_base + i))
1550 domain->ops->free(domain, irq_base + i, 1);
1551 }
1552 }
1553
1554 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1555 unsigned int irq_base,
1556 unsigned int nr_irqs, void *arg)
1557 {
1558 if (!domain->ops->alloc) {
1559 pr_debug("domain->ops->alloc() is NULL\n");
1560 return -ENOSYS;
1561 }
1562
1563 return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1564 }
1565
1566 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1567 unsigned int nr_irqs, int node, void *arg,
1568 bool realloc, const struct irq_affinity_desc *affinity)
1569 {
1570 int i, ret, virq;
1571
1572 if (realloc && irq_base >= 0) {
1573 virq = irq_base;
1574 } else {
1575 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1576 affinity);
1577 if (virq < 0) {
1578 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1579 irq_base, nr_irqs);
1580 return virq;
1581 }
1582 }
1583
1584 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1585 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1586 ret = -ENOMEM;
1587 goto out_free_desc;
1588 }
1589
1590 ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1591 if (ret < 0)
1592 goto out_free_irq_data;
1593
1594 for (i = 0; i < nr_irqs; i++) {
1595 ret = irq_domain_trim_hierarchy(virq + i);
1596 if (ret)
1597 goto out_free_irq_data;
1598 }
1599
1600 for (i = 0; i < nr_irqs; i++)
1601 irq_domain_insert_irq(virq + i);
1602
1603 return virq;
1604
1605 out_free_irq_data:
1606 irq_domain_free_irq_data(virq, nr_irqs);
1607 out_free_desc:
1608 irq_free_descs(virq, nr_irqs);
1609 return ret;
1610 }
1611
1612 /**
1613 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1614 * @domain: domain to allocate from
1615 * @irq_base: allocate specified IRQ number if irq_base >= 0
1616 * @nr_irqs: number of IRQs to allocate
1617 * @node: NUMA node id for memory allocation
1618 * @arg: domain specific argument
1619 * @realloc: IRQ descriptors have already been allocated if true
1620 * @affinity: Optional irq affinity mask for multiqueue devices
1621 *
1622 * Allocate IRQ numbers and initialized all data structures to support
1623 * hierarchy IRQ domains.
1624 * Parameter @realloc is mainly to support legacy IRQs.
1625 * Returns error code or allocated IRQ number
1626 *
1627 * The whole process to setup an IRQ has been split into two steps.
1628 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1629 * descriptor and required hardware resources. The second step,
1630 * irq_domain_activate_irq(), is to program the hardware with preallocated
1631 * resources. In this way, it's easier to rollback when failing to
1632 * allocate resources.
1633 */
1634 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1635 unsigned int nr_irqs, int node, void *arg,
1636 bool realloc, const struct irq_affinity_desc *affinity)
1637 {
1638 int ret;
1639
1640 if (domain == NULL) {
1641 domain = irq_default_domain;
1642 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1643 return -EINVAL;
1644 }
1645
1646 mutex_lock(&domain->root->mutex);
1647 ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1648 realloc, affinity);
1649 mutex_unlock(&domain->root->mutex);
1650
1651 return ret;
1652 }
1653 EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1654
1655 /* The irq_data was moved, fix the revmap to refer to the new location */
1656 static void irq_domain_fix_revmap(struct irq_data *d)
1657 {
1658 void __rcu **slot;
1659
1660 lockdep_assert_held(&d->domain->root->mutex);
1661
1662 if (irq_domain_is_nomap(d->domain))
1663 return;
1664
1665 /* Fix up the revmap. */
1666 if (d->hwirq < d->domain->revmap_size) {
1667 /* Not using radix tree */
1668 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1669 } else {
1670 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1671 if (slot)
1672 radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1673 }
1674 }
1675
1676 /**
1677 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1678 * @domain: Domain to push.
1679 * @virq: Irq to push the domain in to.
1680 * @arg: Passed to the irq_domain_ops alloc() function.
1681 *
1682 * For an already existing irqdomain hierarchy, as might be obtained
1683 * via a call to pci_enable_msix(), add an additional domain to the
1684 * head of the processing chain. Must be called before request_irq()
1685 * has been called.
1686 */
1687 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1688 {
1689 struct irq_data *irq_data = irq_get_irq_data(virq);
1690 struct irq_data *parent_irq_data;
1691 struct irq_desc *desc;
1692 int rv = 0;
1693
1694 /*
1695 * Check that no action has been set, which indicates the virq
1696 * is in a state where this function doesn't have to deal with
1697 * races between interrupt handling and maintaining the
1698 * hierarchy. This will catch gross misuse. Attempting to
1699 * make the check race free would require holding locks across
1700 * calls to struct irq_domain_ops->alloc(), which could lead
1701 * to deadlock, so we just do a simple check before starting.
1702 */
1703 desc = irq_to_desc(virq);
1704 if (!desc)
1705 return -EINVAL;
1706 if (WARN_ON(desc->action))
1707 return -EBUSY;
1708
1709 if (domain == NULL)
1710 return -EINVAL;
1711
1712 if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1713 return -EINVAL;
1714
1715 if (!irq_data)
1716 return -EINVAL;
1717
1718 if (domain->parent != irq_data->domain)
1719 return -EINVAL;
1720
1721 parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1722 irq_data_get_node(irq_data));
1723 if (!parent_irq_data)
1724 return -ENOMEM;
1725
1726 mutex_lock(&domain->root->mutex);
1727
1728 /* Copy the original irq_data. */
1729 *parent_irq_data = *irq_data;
1730
1731 /*
1732 * Overwrite the irq_data, which is embedded in struct irq_desc, with
1733 * values for this domain.
1734 */
1735 irq_data->parent_data = parent_irq_data;
1736 irq_data->domain = domain;
1737 irq_data->mask = 0;
1738 irq_data->hwirq = 0;
1739 irq_data->chip = NULL;
1740 irq_data->chip_data = NULL;
1741
1742 /* May (probably does) set hwirq, chip, etc. */
1743 rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1744 if (rv) {
1745 /* Restore the original irq_data. */
1746 *irq_data = *parent_irq_data;
1747 kfree(parent_irq_data);
1748 goto error;
1749 }
1750
1751 irq_domain_fix_revmap(parent_irq_data);
1752 irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
1753 error:
1754 mutex_unlock(&domain->root->mutex);
1755
1756 return rv;
1757 }
1758 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1759
1760 /**
1761 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1762 * @domain: Domain to remove.
1763 * @virq: Irq to remove the domain from.
1764 *
1765 * Undo the effects of a call to irq_domain_push_irq(). Must be
1766 * called either before request_irq() or after free_irq().
1767 */
1768 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1769 {
1770 struct irq_data *irq_data = irq_get_irq_data(virq);
1771 struct irq_data *parent_irq_data;
1772 struct irq_data *tmp_irq_data;
1773 struct irq_desc *desc;
1774
1775 /*
1776 * Check that no action is set, which indicates the virq is in
1777 * a state where this function doesn't have to deal with races
1778 * between interrupt handling and maintaining the hierarchy.
1779 * This will catch gross misuse. Attempting to make the check
1780 * race free would require holding locks across calls to
1781 * struct irq_domain_ops->free(), which could lead to
1782 * deadlock, so we just do a simple check before starting.
1783 */
1784 desc = irq_to_desc(virq);
1785 if (!desc)
1786 return -EINVAL;
1787 if (WARN_ON(desc->action))
1788 return -EBUSY;
1789
1790 if (domain == NULL)
1791 return -EINVAL;
1792
1793 if (!irq_data)
1794 return -EINVAL;
1795
1796 tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1797
1798 /* We can only "pop" if this domain is at the top of the list */
1799 if (WARN_ON(irq_data != tmp_irq_data))
1800 return -EINVAL;
1801
1802 if (WARN_ON(irq_data->domain != domain))
1803 return -EINVAL;
1804
1805 parent_irq_data = irq_data->parent_data;
1806 if (WARN_ON(!parent_irq_data))
1807 return -EINVAL;
1808
1809 mutex_lock(&domain->root->mutex);
1810
1811 irq_data->parent_data = NULL;
1812
1813 irq_domain_clear_mapping(domain, irq_data->hwirq);
1814 irq_domain_free_irqs_hierarchy(domain, virq, 1);
1815
1816 /* Restore the original irq_data. */
1817 *irq_data = *parent_irq_data;
1818
1819 irq_domain_fix_revmap(irq_data);
1820
1821 mutex_unlock(&domain->root->mutex);
1822
1823 kfree(parent_irq_data);
1824
1825 return 0;
1826 }
1827 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1828
1829 /**
1830 * irq_domain_free_irqs - Free IRQ number and associated data structures
1831 * @virq: base IRQ number
1832 * @nr_irqs: number of IRQs to free
1833 */
1834 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1835 {
1836 struct irq_data *data = irq_get_irq_data(virq);
1837 struct irq_domain *domain;
1838 int i;
1839
1840 if (WARN(!data || !data->domain || !data->domain->ops->free,
1841 "NULL pointer, cannot free irq\n"))
1842 return;
1843
1844 domain = data->domain;
1845
1846 mutex_lock(&domain->root->mutex);
1847 for (i = 0; i < nr_irqs; i++)
1848 irq_domain_remove_irq(virq + i);
1849 irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
1850 mutex_unlock(&domain->root->mutex);
1851
1852 irq_domain_free_irq_data(virq, nr_irqs);
1853 irq_free_descs(virq, nr_irqs);
1854 }
1855
1856 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq)
1857 {
1858 if (irq_domain_is_msi_device(domain))
1859 msi_device_domain_free_wired(domain, virq);
1860 else
1861 irq_domain_free_irqs(virq, 1);
1862 }
1863
1864 /**
1865 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1866 * @domain: Domain below which interrupts must be allocated
1867 * @irq_base: Base IRQ number
1868 * @nr_irqs: Number of IRQs to allocate
1869 * @arg: Allocation data (arch/domain specific)
1870 */
1871 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1872 unsigned int irq_base, unsigned int nr_irqs,
1873 void *arg)
1874 {
1875 if (!domain->parent)
1876 return -ENOSYS;
1877
1878 return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1879 nr_irqs, arg);
1880 }
1881 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1882
1883 /**
1884 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1885 * @domain: Domain below which interrupts must be freed
1886 * @irq_base: Base IRQ number
1887 * @nr_irqs: Number of IRQs to free
1888 */
1889 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1890 unsigned int irq_base, unsigned int nr_irqs)
1891 {
1892 if (!domain->parent)
1893 return;
1894
1895 irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1896 }
1897 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1898
1899 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1900 {
1901 if (irq_data && irq_data->domain) {
1902 struct irq_domain *domain = irq_data->domain;
1903
1904 if (domain->ops->deactivate)
1905 domain->ops->deactivate(domain, irq_data);
1906 if (irq_data->parent_data)
1907 __irq_domain_deactivate_irq(irq_data->parent_data);
1908 }
1909 }
1910
1911 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1912 {
1913 int ret = 0;
1914
1915 if (irqd && irqd->domain) {
1916 struct irq_domain *domain = irqd->domain;
1917
1918 if (irqd->parent_data)
1919 ret = __irq_domain_activate_irq(irqd->parent_data,
1920 reserve);
1921 if (!ret && domain->ops->activate) {
1922 ret = domain->ops->activate(domain, irqd, reserve);
1923 /* Rollback in case of error */
1924 if (ret && irqd->parent_data)
1925 __irq_domain_deactivate_irq(irqd->parent_data);
1926 }
1927 }
1928 return ret;
1929 }
1930
1931 /**
1932 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1933 * interrupt
1934 * @irq_data: Outermost irq_data associated with interrupt
1935 * @reserve: If set only reserve an interrupt vector instead of assigning one
1936 *
1937 * This is the second step to call domain_ops->activate to program interrupt
1938 * controllers, so the interrupt could actually get delivered.
1939 */
1940 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1941 {
1942 int ret = 0;
1943
1944 if (!irqd_is_activated(irq_data))
1945 ret = __irq_domain_activate_irq(irq_data, reserve);
1946 if (!ret)
1947 irqd_set_activated(irq_data);
1948 return ret;
1949 }
1950
1951 /**
1952 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1953 * deactivate interrupt
1954 * @irq_data: outermost irq_data associated with interrupt
1955 *
1956 * It calls domain_ops->deactivate to program interrupt controllers to disable
1957 * interrupt delivery.
1958 */
1959 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1960 {
1961 if (irqd_is_activated(irq_data)) {
1962 __irq_domain_deactivate_irq(irq_data);
1963 irqd_clr_activated(irq_data);
1964 }
1965 }
1966
1967 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1968 {
1969 /* Hierarchy irq_domains must implement callback alloc() */
1970 if (domain->ops->alloc)
1971 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1972 }
1973 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1974 /**
1975 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1976 * @domain: domain to match
1977 * @virq: IRQ number to get irq_data
1978 */
1979 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1980 unsigned int virq)
1981 {
1982 struct irq_data *irq_data = irq_get_irq_data(virq);
1983
1984 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1985 }
1986 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1987
1988 /**
1989 * irq_domain_set_info - Set the complete data for a @virq in @domain
1990 * @domain: Interrupt domain to match
1991 * @virq: IRQ number
1992 * @hwirq: The hardware interrupt number
1993 * @chip: The associated interrupt chip
1994 * @chip_data: The associated interrupt chip data
1995 * @handler: The interrupt flow handler
1996 * @handler_data: The interrupt flow handler data
1997 * @handler_name: The interrupt handler name
1998 */
1999 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
2000 irq_hw_number_t hwirq, const struct irq_chip *chip,
2001 void *chip_data, irq_flow_handler_t handler,
2002 void *handler_data, const char *handler_name)
2003 {
2004 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
2005 irq_set_chip_data(virq, chip_data);
2006 irq_set_handler_data(virq, handler_data);
2007 }
2008
2009 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
2010 unsigned int nr_irqs, int node, void *arg,
2011 bool realloc, const struct irq_affinity_desc *affinity)
2012 {
2013 return -EINVAL;
2014 }
2015
2016 static void irq_domain_check_hierarchy(struct irq_domain *domain) { }
2017 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq) { }
2018
2019 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
2020
2021 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
2022 #include "internals.h"
2023
2024 static struct dentry *domain_dir;
2025
2026 static const struct irq_bit_descr irqdomain_flags[] = {
2027 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_HIERARCHY),
2028 BIT_MASK_DESCR(IRQ_DOMAIN_NAME_ALLOCATED),
2029 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_IPI_PER_CPU),
2030 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_IPI_SINGLE),
2031 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI),
2032 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_ISOLATED_MSI),
2033 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_NO_MAP),
2034 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI_PARENT),
2035 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI_DEVICE),
2036 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_NONCORE),
2037 };
2038
2039 static void irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
2040 {
2041 seq_printf(m, "%*sname: %s\n", ind, "", d->name);
2042 seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size);
2043 seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
2044 seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
2045 irq_debug_show_bits(m, ind, d->flags, irqdomain_flags, ARRAY_SIZE(irqdomain_flags));
2046 if (d->ops && d->ops->debug_show)
2047 d->ops->debug_show(m, d, NULL, ind + 1);
2048 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2049 if (!d->parent)
2050 return;
2051 seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
2052 irq_domain_debug_show_one(m, d->parent, ind + 4);
2053 #endif
2054 }
2055
2056 static int irq_domain_debug_show(struct seq_file *m, void *p)
2057 {
2058 struct irq_domain *d = m->private;
2059
2060 /* Default domain? Might be NULL */
2061 if (!d) {
2062 if (!irq_default_domain)
2063 return 0;
2064 d = irq_default_domain;
2065 }
2066 irq_domain_debug_show_one(m, d, 0);
2067 return 0;
2068 }
2069 DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
2070
2071 static void debugfs_add_domain_dir(struct irq_domain *d)
2072 {
2073 if (!d->name || !domain_dir)
2074 return;
2075 debugfs_create_file(d->name, 0444, domain_dir, d,
2076 &irq_domain_debug_fops);
2077 }
2078
2079 static void debugfs_remove_domain_dir(struct irq_domain *d)
2080 {
2081 debugfs_lookup_and_remove(d->name, domain_dir);
2082 }
2083
2084 void __init irq_domain_debugfs_init(struct dentry *root)
2085 {
2086 struct irq_domain *d;
2087
2088 domain_dir = debugfs_create_dir("domains", root);
2089
2090 debugfs_create_file("default", 0444, domain_dir, NULL,
2091 &irq_domain_debug_fops);
2092 mutex_lock(&irq_domain_mutex);
2093 list_for_each_entry(d, &irq_domain_list, link)
2094 debugfs_add_domain_dir(d);
2095 mutex_unlock(&irq_domain_mutex);
2096 }
2097 #endif
2098
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