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
23static LIST_HEAD(irq_domain_list);
24static DEFINE_MUTEX(irq_domain_mutex);
25
26static struct irq_domain *irq_default_domain;
27
28static 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);
31static void irq_domain_check_hierarchy(struct irq_domain *domain);
32static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq);
33
34struct 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
42static void debugfs_add_domain_dir(struct irq_domain *d);
43static void debugfs_remove_domain_dir(struct irq_domain *d);
44#else
45static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
46static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
47#endif
48
49static 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
56const struct fwnode_operations irqchip_fwnode_ops = {
57 .get_name = irqchip_fwnode_get_name,
58};
59EXPORT_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 */
77struct 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, fmt: "%s", name);
89 break;
90 case IRQCHIP_FWNODE_NAMED_ID:
91 n = kasprintf(GFP_KERNEL, fmt: "%s-%d", name, id);
92 break;
93 default:
94 n = kasprintf(GFP_KERNEL, fmt: "irqchip@%pa", pa);
95 break;
96 }
97
98 if (!fwid || !n) {
99 kfree(objp: fwid);
100 kfree(objp: n);
101 return NULL;
102 }
103
104 fwid->type = type;
105 fwid->name = n;
106 fwid->pa = pa;
107 fwnode_init(fwnode: &fwid->fwnode, ops: &irqchip_fwnode_ops);
108 return &fwid->fwnode;
109}
110EXPORT_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 */
118void 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(objp: fwid->name);
127 kfree(objp: fwid);
128}
129EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
130
131static int alloc_name(struct irq_domain *domain, char *base, enum irq_domain_bus_token bus_token)
132{
133 if (bus_token == DOMAIN_BUS_ANY)
134 domain->name = kasprintf(GFP_KERNEL, fmt: "%s", base);
135 else
136 domain->name = kasprintf(GFP_KERNEL, fmt: "%s-%d", base, bus_token);
137 if (!domain->name)
138 return -ENOMEM;
139
140 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
141 return 0;
142}
143
144static int alloc_fwnode_name(struct irq_domain *domain, const struct fwnode_handle *fwnode,
145 enum irq_domain_bus_token bus_token, const char *suffix)
146{
147 const char *sep = suffix ? "-" : "";
148 const char *suf = suffix ? : "";
149 char *name;
150
151 if (bus_token == DOMAIN_BUS_ANY)
152 name = kasprintf(GFP_KERNEL, fmt: "%pfw%s%s", fwnode, sep, suf);
153 else
154 name = kasprintf(GFP_KERNEL, fmt: "%pfw%s%s-%d", fwnode, sep, suf, bus_token);
155 if (!name)
156 return -ENOMEM;
157
158 /*
159 * fwnode paths contain '/', which debugfs is legitimately unhappy
160 * about. Replace them with ':', which does the trick and is not as
161 * offensive as '\'...
162 */
163 domain->name = strreplace(str: name, old: '/', new: ':');
164 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
165 return 0;
166}
167
168static int alloc_unknown_name(struct irq_domain *domain, enum irq_domain_bus_token bus_token)
169{
170 static atomic_t unknown_domains;
171 int id = atomic_inc_return(v: &unknown_domains);
172
173 if (bus_token == DOMAIN_BUS_ANY)
174 domain->name = kasprintf(GFP_KERNEL, fmt: "unknown-%d", id);
175 else
176 domain->name = kasprintf(GFP_KERNEL, fmt: "unknown-%d-%d", id, bus_token);
177 if (!domain->name)
178 return -ENOMEM;
179
180 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
181 return 0;
182}
183
184static int irq_domain_set_name(struct irq_domain *domain, const struct irq_domain_info *info)
185{
186 enum irq_domain_bus_token bus_token = info->bus_token;
187 const struct fwnode_handle *fwnode = info->fwnode;
188
189 if (is_fwnode_irqchip(fwnode)) {
190 struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
191
192 /*
193 * The name_suffix is only intended to be used to avoid a name
194 * collision when multiple domains are created for a single
195 * device and the name is picked using a real device node.
196 * (Typical use-case is regmap-IRQ controllers for devices
197 * providing more than one physical IRQ.) There should be no
198 * need to use name_suffix with irqchip-fwnode.
199 */
200 if (info->name_suffix)
201 return -EINVAL;
202
203 switch (fwid->type) {
204 case IRQCHIP_FWNODE_NAMED:
205 case IRQCHIP_FWNODE_NAMED_ID:
206 return alloc_name(domain, base: fwid->name, bus_token);
207 default:
208 domain->name = fwid->name;
209 if (bus_token != DOMAIN_BUS_ANY)
210 return alloc_name(domain, base: fwid->name, bus_token);
211 }
212
213 } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) || is_software_node(fwnode)) {
214 return alloc_fwnode_name(domain, fwnode, bus_token, suffix: info->name_suffix);
215 }
216
217 if (domain->name)
218 return 0;
219
220 if (fwnode)
221 pr_err("Invalid fwnode type for irqdomain\n");
222 return alloc_unknown_name(domain, bus_token);
223}
224
225static struct irq_domain *__irq_domain_create(const struct irq_domain_info *info)
226{
227 struct irq_domain *domain;
228 int err;
229
230 if (WARN_ON((info->size && info->direct_max) ||
231 (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && info->direct_max) ||
232 (info->direct_max && info->direct_max != info->hwirq_max)))
233 return ERR_PTR(error: -EINVAL);
234
235 domain = kzalloc_node(struct_size(domain, revmap, info->size),
236 GFP_KERNEL, of_node_to_nid(to_of_node(info->fwnode)));
237 if (!domain)
238 return ERR_PTR(error: -ENOMEM);
239
240 err = irq_domain_set_name(domain, info);
241 if (err) {
242 kfree(objp: domain);
243 return ERR_PTR(error: err);
244 }
245
246 domain->fwnode = fwnode_handle_get(fwnode: info->fwnode);
247 fwnode_dev_initialized(fwnode: domain->fwnode, initialized: true);
248
249 /* Fill structure */
250 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
251 domain->ops = info->ops;
252 domain->host_data = info->host_data;
253 domain->bus_token = info->bus_token;
254 domain->hwirq_max = info->hwirq_max;
255
256 if (info->direct_max)
257 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
258
259 domain->revmap_size = info->size;
260
261 /*
262 * Hierarchical domains use the domain lock of the root domain
263 * (innermost domain).
264 *
265 * For non-hierarchical domains (as for root domains), the root
266 * pointer is set to the domain itself so that &domain->root->mutex
267 * always points to the right lock.
268 */
269 mutex_init(&domain->mutex);
270 domain->root = domain;
271
272 irq_domain_check_hierarchy(domain);
273
274 return domain;
275}
276
277static void __irq_domain_publish(struct irq_domain *domain)
278{
279 mutex_lock(&irq_domain_mutex);
280 debugfs_add_domain_dir(d: domain);
281 list_add(new: &domain->link, head: &irq_domain_list);
282 mutex_unlock(lock: &irq_domain_mutex);
283
284 pr_debug("Added domain %s\n", domain->name);
285}
286
287static void irq_domain_free(struct irq_domain *domain)
288{
289 fwnode_dev_initialized(fwnode: domain->fwnode, initialized: false);
290 fwnode_handle_put(fwnode: domain->fwnode);
291 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
292 kfree(objp: domain->name);
293 kfree(objp: domain);
294}
295
296static void irq_domain_instantiate_descs(const struct irq_domain_info *info)
297{
298 if (!IS_ENABLED(CONFIG_SPARSE_IRQ))
299 return;
300
301 if (irq_alloc_descs(info->virq_base, info->virq_base, info->size,
302 of_node_to_nid(to_of_node(info->fwnode))) < 0) {
303 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
304 info->virq_base);
305 }
306}
307
308static struct irq_domain *__irq_domain_instantiate(const struct irq_domain_info *info,
309 bool cond_alloc_descs, bool force_associate)
310{
311 struct irq_domain *domain;
312 int err;
313
314 domain = __irq_domain_create(info);
315 if (IS_ERR(ptr: domain))
316 return domain;
317
318 domain->flags |= info->domain_flags;
319 domain->exit = info->exit;
320 domain->dev = info->dev;
321
322#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
323 if (info->parent) {
324 domain->root = info->parent->root;
325 domain->parent = info->parent;
326 }
327#endif
328
329 if (info->dgc_info) {
330 err = irq_domain_alloc_generic_chips(d: domain, info: info->dgc_info);
331 if (err)
332 goto err_domain_free;
333 }
334
335 if (info->init) {
336 err = info->init(domain);
337 if (err)
338 goto err_domain_gc_remove;
339 }
340
341 __irq_domain_publish(domain);
342
343 if (cond_alloc_descs && info->virq_base > 0)
344 irq_domain_instantiate_descs(info);
345
346 /*
347 * Legacy interrupt domains have a fixed Linux interrupt number
348 * associated. Other interrupt domains can request association by
349 * providing a Linux interrupt number > 0.
350 */
351 if (force_associate || info->virq_base > 0) {
352 irq_domain_associate_many(domain, irq_base: info->virq_base, hwirq_base: info->hwirq_base,
353 count: info->size - info->hwirq_base);
354 }
355
356 return domain;
357
358err_domain_gc_remove:
359 if (info->dgc_info)
360 irq_domain_remove_generic_chips(d: domain);
361err_domain_free:
362 irq_domain_free(domain);
363 return ERR_PTR(error: err);
364}
365
366/**
367 * irq_domain_instantiate() - Instantiate a new irq domain data structure
368 * @info: Domain information pointer pointing to the information for this domain
369 *
370 * Return: A pointer to the instantiated irq domain or an ERR_PTR value.
371 */
372struct irq_domain *irq_domain_instantiate(const struct irq_domain_info *info)
373{
374 return __irq_domain_instantiate(info, cond_alloc_descs: false, force_associate: false);
375}
376EXPORT_SYMBOL_GPL(irq_domain_instantiate);
377
378/**
379 * irq_domain_remove() - Remove an irq domain.
380 * @domain: domain to remove
381 *
382 * This routine is used to remove an irq domain. The caller must ensure
383 * that all mappings within the domain have been disposed of prior to
384 * use, depending on the revmap type.
385 */
386void irq_domain_remove(struct irq_domain *domain)
387{
388 if (domain->exit)
389 domain->exit(domain);
390
391 mutex_lock(&irq_domain_mutex);
392 debugfs_remove_domain_dir(d: domain);
393
394 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
395
396 list_del(entry: &domain->link);
397
398 /*
399 * If the going away domain is the default one, reset it.
400 */
401 if (unlikely(irq_default_domain == domain))
402 irq_set_default_domain(NULL);
403
404 mutex_unlock(lock: &irq_domain_mutex);
405
406 if (domain->flags & IRQ_DOMAIN_FLAG_DESTROY_GC)
407 irq_domain_remove_generic_chips(d: domain);
408
409 pr_debug("Removed domain %s\n", domain->name);
410 irq_domain_free(domain);
411}
412EXPORT_SYMBOL_GPL(irq_domain_remove);
413
414void irq_domain_update_bus_token(struct irq_domain *domain,
415 enum irq_domain_bus_token bus_token)
416{
417 char *name;
418
419 if (domain->bus_token == bus_token)
420 return;
421
422 mutex_lock(&irq_domain_mutex);
423
424 domain->bus_token = bus_token;
425
426 name = kasprintf(GFP_KERNEL, fmt: "%s-%d", domain->name, bus_token);
427 if (!name) {
428 mutex_unlock(lock: &irq_domain_mutex);
429 return;
430 }
431
432 debugfs_remove_domain_dir(d: domain);
433
434 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
435 kfree(objp: domain->name);
436 else
437 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
438
439 domain->name = name;
440 debugfs_add_domain_dir(d: domain);
441
442 mutex_unlock(lock: &irq_domain_mutex);
443}
444EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
445
446/**
447 * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
448 * @fwnode: firmware node for the interrupt controller
449 * @size: total number of irqs in mapping
450 * @first_irq: first number of irq block assigned to the domain,
451 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
452 * pre-map all of the irqs in the domain to virqs starting at first_irq.
453 * @ops: domain callbacks
454 * @host_data: Controller private data pointer
455 *
456 * Allocates an irq_domain, and optionally if first_irq is positive then also
457 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
458 *
459 * This is intended to implement the expected behaviour for most
460 * interrupt controllers. If device tree is used, then first_irq will be 0 and
461 * irqs get mapped dynamically on the fly. However, if the controller requires
462 * static virq assignments (non-DT boot) then it will set that up correctly.
463 */
464struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
465 unsigned int size,
466 unsigned int first_irq,
467 const struct irq_domain_ops *ops,
468 void *host_data)
469{
470 struct irq_domain_info info = {
471 .fwnode = fwnode,
472 .size = size,
473 .hwirq_max = size,
474 .virq_base = first_irq,
475 .ops = ops,
476 .host_data = host_data,
477 };
478 struct irq_domain *domain = __irq_domain_instantiate(info: &info, cond_alloc_descs: true, force_associate: false);
479
480 return IS_ERR(ptr: domain) ? NULL : domain;
481}
482EXPORT_SYMBOL_GPL(irq_domain_create_simple);
483
484struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
485 unsigned int size,
486 unsigned int first_irq,
487 irq_hw_number_t first_hwirq,
488 const struct irq_domain_ops *ops,
489 void *host_data)
490{
491 struct irq_domain_info info = {
492 .fwnode = fwnode,
493 .size = first_hwirq + size,
494 .hwirq_max = first_hwirq + size,
495 .hwirq_base = first_hwirq,
496 .virq_base = first_irq,
497 .ops = ops,
498 .host_data = host_data,
499 };
500 struct irq_domain *domain = __irq_domain_instantiate(info: &info, cond_alloc_descs: false, force_associate: true);
501
502 return IS_ERR(ptr: domain) ? NULL : domain;
503}
504EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
505
506/**
507 * irq_find_matching_fwspec() - Locates a domain for a given fwspec
508 * @fwspec: FW specifier for an interrupt
509 * @bus_token: domain-specific data
510 */
511struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
512 enum irq_domain_bus_token bus_token)
513{
514 struct irq_domain *h, *found = NULL;
515 struct fwnode_handle *fwnode = fwspec->fwnode;
516 int rc;
517
518 /*
519 * We might want to match the legacy controller last since
520 * it might potentially be set to match all interrupts in
521 * the absence of a device node. This isn't a problem so far
522 * yet though...
523 *
524 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
525 * values must generate an exact match for the domain to be
526 * selected.
527 */
528 mutex_lock(&irq_domain_mutex);
529 list_for_each_entry(h, &irq_domain_list, link) {
530 if (h->ops->select && bus_token != DOMAIN_BUS_ANY)
531 rc = h->ops->select(h, fwspec, bus_token);
532 else if (h->ops->match)
533 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
534 else
535 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
536 ((bus_token == DOMAIN_BUS_ANY) ||
537 (h->bus_token == bus_token)));
538
539 if (rc) {
540 found = h;
541 break;
542 }
543 }
544 mutex_unlock(lock: &irq_domain_mutex);
545 return found;
546}
547EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
548
549/**
550 * irq_set_default_domain() - Set a "default" irq domain
551 * @domain: default domain pointer
552 *
553 * For convenience, it's possible to set a "default" domain that will be used
554 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
555 * platforms that want to manipulate a few hard coded interrupt numbers that
556 * aren't properly represented in the device-tree.
557 */
558void irq_set_default_domain(struct irq_domain *domain)
559{
560 pr_debug("Default domain set to @0x%p\n", domain);
561
562 irq_default_domain = domain;
563}
564EXPORT_SYMBOL_GPL(irq_set_default_domain);
565
566/**
567 * irq_get_default_domain() - Retrieve the "default" irq domain
568 *
569 * Returns: the default domain, if any.
570 *
571 * Modern code should never use this. This should only be used on
572 * systems that cannot implement a firmware->fwnode mapping (which
573 * both DT and ACPI provide).
574 */
575struct irq_domain *irq_get_default_domain(void)
576{
577 return irq_default_domain;
578}
579EXPORT_SYMBOL_GPL(irq_get_default_domain);
580
581static bool irq_domain_is_nomap(struct irq_domain *domain)
582{
583 return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
584 (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
585}
586
587static void irq_domain_clear_mapping(struct irq_domain *domain,
588 irq_hw_number_t hwirq)
589{
590 lockdep_assert_held(&domain->root->mutex);
591
592 if (irq_domain_is_nomap(domain))
593 return;
594
595 if (hwirq < domain->revmap_size)
596 rcu_assign_pointer(domain->revmap[hwirq], NULL);
597 else
598 radix_tree_delete(&domain->revmap_tree, hwirq);
599}
600
601static void irq_domain_set_mapping(struct irq_domain *domain,
602 irq_hw_number_t hwirq,
603 struct irq_data *irq_data)
604{
605 /*
606 * This also makes sure that all domains point to the same root when
607 * called from irq_domain_insert_irq() for each domain in a hierarchy.
608 */
609 lockdep_assert_held(&domain->root->mutex);
610
611 if (irq_domain_is_nomap(domain))
612 return;
613
614 if (hwirq < domain->revmap_size)
615 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
616 else
617 radix_tree_insert(&domain->revmap_tree, index: hwirq, irq_data);
618}
619
620static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
621{
622 struct irq_data *irq_data = irq_get_irq_data(irq);
623 irq_hw_number_t hwirq;
624
625 if (WARN(!irq_data || irq_data->domain != domain,
626 "virq%i doesn't exist; cannot disassociate\n", irq))
627 return;
628
629 hwirq = irq_data->hwirq;
630
631 mutex_lock(&domain->root->mutex);
632
633 irq_set_status_flags(irq, set: IRQ_NOREQUEST);
634
635 /* remove chip and handler */
636 irq_set_chip_and_handler(irq, NULL, NULL);
637
638 /* Make sure it's completed */
639 synchronize_irq(irq);
640
641 /* Tell the PIC about it */
642 if (domain->ops->unmap)
643 domain->ops->unmap(domain, irq);
644 smp_mb();
645
646 irq_data->domain = NULL;
647 irq_data->hwirq = 0;
648 domain->mapcount--;
649
650 /* Clear reverse map for this hwirq */
651 irq_domain_clear_mapping(domain, hwirq);
652
653 mutex_unlock(lock: &domain->root->mutex);
654}
655
656static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
657 irq_hw_number_t hwirq)
658{
659 struct irq_data *irq_data = irq_get_irq_data(irq: virq);
660 int ret;
661
662 if (WARN(hwirq >= domain->hwirq_max,
663 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
664 return -EINVAL;
665 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
666 return -EINVAL;
667 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
668 return -EINVAL;
669
670 irq_data->hwirq = hwirq;
671 irq_data->domain = domain;
672 if (domain->ops->map) {
673 ret = domain->ops->map(domain, virq, hwirq);
674 if (ret != 0) {
675 /*
676 * If map() returns -EPERM, this interrupt is protected
677 * by the firmware or some other service and shall not
678 * be mapped. Don't bother telling the user about it.
679 */
680 if (ret != -EPERM) {
681 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
682 domain->name, hwirq, virq, ret);
683 }
684 irq_data->domain = NULL;
685 irq_data->hwirq = 0;
686 return ret;
687 }
688 }
689
690 domain->mapcount++;
691 irq_domain_set_mapping(domain, hwirq, irq_data);
692
693 irq_clear_status_flags(irq: virq, clr: IRQ_NOREQUEST);
694
695 return 0;
696}
697
698int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
699 irq_hw_number_t hwirq)
700{
701 int ret;
702
703 mutex_lock(&domain->root->mutex);
704 ret = irq_domain_associate_locked(domain, virq, hwirq);
705 mutex_unlock(lock: &domain->root->mutex);
706
707 return ret;
708}
709EXPORT_SYMBOL_GPL(irq_domain_associate);
710
711void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
712 irq_hw_number_t hwirq_base, int count)
713{
714 struct device_node *of_node;
715 int i;
716
717 of_node = irq_domain_get_of_node(d: domain);
718 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
719 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
720
721 for (i = 0; i < count; i++)
722 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
723}
724EXPORT_SYMBOL_GPL(irq_domain_associate_many);
725
726#ifdef CONFIG_IRQ_DOMAIN_NOMAP
727/**
728 * irq_create_direct_mapping() - Allocate an irq for direct mapping
729 * @domain: domain to allocate the irq for or NULL for default domain
730 *
731 * This routine is used for irq controllers which can choose the hardware
732 * interrupt numbers they generate. In such a case it's simplest to use
733 * the linux irq as the hardware interrupt number. It still uses the linear
734 * or radix tree to store the mapping, but the irq controller can optimize
735 * the revmap path by using the hwirq directly.
736 */
737unsigned int irq_create_direct_mapping(struct irq_domain *domain)
738{
739 struct device_node *of_node;
740 unsigned int virq;
741
742 if (domain == NULL)
743 domain = irq_default_domain;
744
745 of_node = irq_domain_get_of_node(domain);
746 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
747 if (!virq) {
748 pr_debug("create_direct virq allocation failed\n");
749 return 0;
750 }
751 if (virq >= domain->hwirq_max) {
752 pr_err("ERROR: no free irqs available below %lu maximum\n",
753 domain->hwirq_max);
754 irq_free_desc(virq);
755 return 0;
756 }
757 pr_debug("create_direct obtained virq %d\n", virq);
758
759 if (irq_domain_associate(domain, virq, virq)) {
760 irq_free_desc(virq);
761 return 0;
762 }
763
764 return virq;
765}
766EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
767#endif
768
769static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
770 irq_hw_number_t hwirq,
771 const struct irq_affinity_desc *affinity)
772{
773 struct device_node *of_node = irq_domain_get_of_node(d: domain);
774 int virq;
775
776 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
777
778 /* Allocate a virtual interrupt number */
779 virq = irq_domain_alloc_descs(virq: -1, nr_irqs: 1, hwirq, node: of_node_to_nid(np: of_node),
780 affinity);
781 if (virq <= 0) {
782 pr_debug("-> virq allocation failed\n");
783 return 0;
784 }
785
786 if (irq_domain_associate_locked(domain, virq, hwirq)) {
787 irq_free_desc(irq: virq);
788 return 0;
789 }
790
791 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
792 hwirq, of_node_full_name(of_node), virq);
793
794 return virq;
795}
796
797/**
798 * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
799 * @domain: domain owning this hardware interrupt or NULL for default domain
800 * @hwirq: hardware irq number in that domain space
801 * @affinity: irq affinity
802 *
803 * Only one mapping per hardware interrupt is permitted. Returns a linux
804 * irq number.
805 * If the sense/trigger is to be specified, set_irq_type() should be called
806 * on the number returned from that call.
807 */
808unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
809 irq_hw_number_t hwirq,
810 const struct irq_affinity_desc *affinity)
811{
812 int virq;
813
814 /* Look for default domain if necessary */
815 if (domain == NULL)
816 domain = irq_default_domain;
817 if (domain == NULL) {
818 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
819 return 0;
820 }
821
822 mutex_lock(&domain->root->mutex);
823
824 /* Check if mapping already exists */
825 virq = irq_find_mapping(domain, hwirq);
826 if (virq) {
827 pr_debug("existing mapping on virq %d\n", virq);
828 goto out;
829 }
830
831 virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
832out:
833 mutex_unlock(lock: &domain->root->mutex);
834
835 return virq;
836}
837EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
838
839static int irq_domain_translate(struct irq_domain *d,
840 struct irq_fwspec *fwspec,
841 irq_hw_number_t *hwirq, unsigned int *type)
842{
843#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
844 if (d->ops->translate)
845 return d->ops->translate(d, fwspec, hwirq, type);
846#endif
847 if (d->ops->xlate)
848 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
849 fwspec->param, fwspec->param_count,
850 hwirq, type);
851
852 /* If domain has no translation, then we assume interrupt line */
853 *hwirq = fwspec->param[0];
854 return 0;
855}
856
857void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
858 unsigned int count, struct irq_fwspec *fwspec)
859{
860 int i;
861
862 fwspec->fwnode = of_fwnode_handle(np);
863 fwspec->param_count = count;
864
865 for (i = 0; i < count; i++)
866 fwspec->param[i] = args[i];
867}
868EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
869
870static struct irq_domain *fwspec_to_domain(struct irq_fwspec *fwspec)
871{
872 struct irq_domain *domain;
873
874 if (fwspec->fwnode) {
875 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
876 if (!domain)
877 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
878 } else {
879 domain = irq_default_domain;
880 }
881
882 return domain;
883}
884
885#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
886int irq_populate_fwspec_info(struct irq_fwspec *fwspec, struct irq_fwspec_info *info)
887{
888 struct irq_domain *domain = fwspec_to_domain(fwspec);
889
890 memset(info, 0, sizeof(*info));
891
892 if (!domain || !domain->ops->get_fwspec_info)
893 return 0;
894
895 return domain->ops->get_fwspec_info(fwspec, info);
896}
897#endif
898
899unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
900{
901 unsigned int type = IRQ_TYPE_NONE;
902 struct irq_domain *domain;
903 struct irq_data *irq_data;
904 irq_hw_number_t hwirq;
905 int virq;
906
907 domain = fwspec_to_domain(fwspec);
908 if (!domain) {
909 pr_warn("no irq domain found for %s !\n",
910 of_node_full_name(to_of_node(fwspec->fwnode)));
911 return 0;
912 }
913
914 if (irq_domain_translate(d: domain, fwspec, hwirq: &hwirq, type: &type))
915 return 0;
916
917 /*
918 * WARN if the irqchip returns a type with bits
919 * outside the sense mask set and clear these bits.
920 */
921 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
922 type &= IRQ_TYPE_SENSE_MASK;
923
924 mutex_lock(&domain->root->mutex);
925
926 /*
927 * If we've already configured this interrupt,
928 * don't do it again, or hell will break loose.
929 */
930 virq = irq_find_mapping(domain, hwirq);
931 if (virq) {
932 /*
933 * If the trigger type is not specified or matches the
934 * current trigger type then we are done so return the
935 * interrupt number.
936 */
937 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(irq: virq))
938 goto out;
939
940 /*
941 * If the trigger type has not been set yet, then set
942 * it now and return the interrupt number.
943 */
944 if (irq_get_trigger_type(irq: virq) == IRQ_TYPE_NONE) {
945 irq_data = irq_get_irq_data(irq: virq);
946 if (!irq_data) {
947 virq = 0;
948 goto out;
949 }
950
951 irqd_set_trigger_type(d: irq_data, type);
952 goto out;
953 }
954
955 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
956 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
957 virq = 0;
958 goto out;
959 }
960
961 if (irq_domain_is_hierarchy(domain)) {
962 if (irq_domain_is_msi_device(domain)) {
963 mutex_unlock(lock: &domain->root->mutex);
964 virq = msi_device_domain_alloc_wired(domain, hwirq, type);
965 mutex_lock(&domain->root->mutex);
966 } else
967 virq = irq_domain_alloc_irqs_locked(domain, irq_base: -1, nr_irqs: 1, NUMA_NO_NODE,
968 arg: fwspec, realloc: false, NULL);
969 if (virq <= 0) {
970 virq = 0;
971 goto out;
972 }
973 } else {
974 /* Create mapping */
975 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
976 if (!virq)
977 goto out;
978 }
979
980 irq_data = irq_get_irq_data(irq: virq);
981 if (WARN_ON(!irq_data)) {
982 virq = 0;
983 goto out;
984 }
985
986 /* Store trigger type */
987 irqd_set_trigger_type(d: irq_data, type);
988out:
989 mutex_unlock(lock: &domain->root->mutex);
990
991 return virq;
992}
993EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
994
995unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
996{
997 struct irq_fwspec fwspec;
998
999 of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
1000 irq_data->args_count, &fwspec);
1001
1002 return irq_create_fwspec_mapping(&fwspec);
1003}
1004EXPORT_SYMBOL_GPL(irq_create_of_mapping);
1005
1006/**
1007 * irq_dispose_mapping() - Unmap an interrupt
1008 * @virq: linux irq number of the interrupt to unmap
1009 */
1010void irq_dispose_mapping(unsigned int virq)
1011{
1012 struct irq_data *irq_data;
1013 struct irq_domain *domain;
1014
1015 irq_data = virq ? irq_get_irq_data(irq: virq) : NULL;
1016 if (!irq_data)
1017 return;
1018
1019 domain = irq_data->domain;
1020 if (WARN_ON(domain == NULL))
1021 return;
1022
1023 if (irq_domain_is_hierarchy(domain)) {
1024 irq_domain_free_one_irq(domain, virq);
1025 } else {
1026 irq_domain_disassociate(domain, irq: virq);
1027 irq_free_desc(irq: virq);
1028 }
1029}
1030EXPORT_SYMBOL_GPL(irq_dispose_mapping);
1031
1032/**
1033 * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
1034 * @domain: domain owning this hardware interrupt
1035 * @hwirq: hardware irq number in that domain space
1036 * @irq: optional pointer to return the Linux irq if required
1037 *
1038 * Returns the interrupt descriptor.
1039 */
1040struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
1041 irq_hw_number_t hwirq,
1042 unsigned int *irq)
1043{
1044 struct irq_desc *desc = NULL;
1045 struct irq_data *data;
1046
1047 /* Look for default domain if necessary */
1048 if (domain == NULL)
1049 domain = irq_default_domain;
1050 if (domain == NULL)
1051 return desc;
1052
1053 if (irq_domain_is_nomap(domain)) {
1054 if (hwirq < domain->hwirq_max) {
1055 data = irq_domain_get_irq_data(domain, virq: hwirq);
1056 if (data && data->hwirq == hwirq)
1057 desc = irq_data_to_desc(data);
1058 if (irq && desc)
1059 *irq = hwirq;
1060 }
1061
1062 return desc;
1063 }
1064
1065 rcu_read_lock();
1066 /* Check if the hwirq is in the linear revmap. */
1067 if (hwirq < domain->revmap_size)
1068 data = rcu_dereference(domain->revmap[hwirq]);
1069 else
1070 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
1071
1072 if (likely(data)) {
1073 desc = irq_data_to_desc(data);
1074 if (irq)
1075 *irq = data->irq;
1076 }
1077
1078 rcu_read_unlock();
1079 return desc;
1080}
1081EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
1082
1083/**
1084 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
1085 * @d: Interrupt domain involved in the translation
1086 * @ctrlr: The device tree node for the device whose interrupt is translated
1087 * @intspec: The interrupt specifier data from the device tree
1088 * @intsize: The number of entries in @intspec
1089 * @out_hwirq: Pointer to storage for the hardware interrupt number
1090 * @out_type: Pointer to storage for the interrupt type
1091 *
1092 * Device Tree IRQ specifier translation function which works with one cell
1093 * bindings where the cell value maps directly to the hwirq number.
1094 */
1095int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
1096 const u32 *intspec, unsigned int intsize,
1097 unsigned long *out_hwirq, unsigned int *out_type)
1098{
1099 if (WARN_ON(intsize < 1))
1100 return -EINVAL;
1101 *out_hwirq = intspec[0];
1102 *out_type = IRQ_TYPE_NONE;
1103 return 0;
1104}
1105EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
1106
1107/**
1108 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1109 * @d: Interrupt domain involved in the translation
1110 * @ctrlr: The device tree node for the device whose interrupt is translated
1111 * @intspec: The interrupt specifier data from the device tree
1112 * @intsize: The number of entries in @intspec
1113 * @out_hwirq: Pointer to storage for the hardware interrupt number
1114 * @out_type: Pointer to storage for the interrupt type
1115 *
1116 * Device Tree IRQ specifier translation function which works with two cell
1117 * bindings where the cell values map directly to the hwirq number
1118 * and linux irq flags.
1119 */
1120int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1121 const u32 *intspec, unsigned int intsize,
1122 irq_hw_number_t *out_hwirq, unsigned int *out_type)
1123{
1124 struct irq_fwspec fwspec;
1125
1126 of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1127 return irq_domain_translate_twocell(d, fwspec: &fwspec, out_hwirq, out_type);
1128}
1129EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1130
1131/**
1132 * irq_domain_xlate_twothreecell() - Generic xlate for direct two or three cell bindings
1133 * @d: Interrupt domain involved in the translation
1134 * @ctrlr: The device tree node for the device whose interrupt is translated
1135 * @intspec: The interrupt specifier data from the device tree
1136 * @intsize: The number of entries in @intspec
1137 * @out_hwirq: Pointer to storage for the hardware interrupt number
1138 * @out_type: Pointer to storage for the interrupt type
1139 *
1140 * Device Tree interrupt specifier translation function for two or three
1141 * cell bindings, where the cell values map directly to the hardware
1142 * interrupt number and the type specifier.
1143 */
1144int irq_domain_xlate_twothreecell(struct irq_domain *d, struct device_node *ctrlr,
1145 const u32 *intspec, unsigned int intsize,
1146 irq_hw_number_t *out_hwirq, unsigned int *out_type)
1147{
1148 struct irq_fwspec fwspec;
1149
1150 of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1151
1152 return irq_domain_translate_twothreecell(d, fwspec: &fwspec, out_hwirq, out_type);
1153}
1154EXPORT_SYMBOL_GPL(irq_domain_xlate_twothreecell);
1155
1156/**
1157 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1158 * @d: Interrupt domain involved in the translation
1159 * @ctrlr: The device tree node for the device whose interrupt is translated
1160 * @intspec: The interrupt specifier data from the device tree
1161 * @intsize: The number of entries in @intspec
1162 * @out_hwirq: Pointer to storage for the hardware interrupt number
1163 * @out_type: Pointer to storage for the interrupt type
1164 *
1165 * Device Tree IRQ specifier translation function which works with either one
1166 * or two cell bindings where the cell values map directly to the hwirq number
1167 * and linux irq flags.
1168 *
1169 * Note: don't use this function unless your interrupt controller explicitly
1170 * supports both one and two cell bindings. For the majority of controllers
1171 * the _onecell() or _twocell() variants above should be used.
1172 */
1173int irq_domain_xlate_onetwocell(struct irq_domain *d,
1174 struct device_node *ctrlr,
1175 const u32 *intspec, unsigned int intsize,
1176 unsigned long *out_hwirq, unsigned int *out_type)
1177{
1178 if (WARN_ON(intsize < 1))
1179 return -EINVAL;
1180 *out_hwirq = intspec[0];
1181 if (intsize > 1)
1182 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1183 else
1184 *out_type = IRQ_TYPE_NONE;
1185 return 0;
1186}
1187EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1188
1189const struct irq_domain_ops irq_domain_simple_ops = {
1190 .xlate = irq_domain_xlate_onetwocell,
1191};
1192EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1193
1194/**
1195 * irq_domain_translate_onecell() - Generic translate for direct one cell
1196 * bindings
1197 * @d: Interrupt domain involved in the translation
1198 * @fwspec: The firmware interrupt specifier to translate
1199 * @out_hwirq: Pointer to storage for the hardware interrupt number
1200 * @out_type: Pointer to storage for the interrupt type
1201 */
1202int irq_domain_translate_onecell(struct irq_domain *d,
1203 struct irq_fwspec *fwspec,
1204 unsigned long *out_hwirq,
1205 unsigned int *out_type)
1206{
1207 if (WARN_ON(fwspec->param_count < 1))
1208 return -EINVAL;
1209 *out_hwirq = fwspec->param[0];
1210 *out_type = IRQ_TYPE_NONE;
1211 return 0;
1212}
1213EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1214
1215/**
1216 * irq_domain_translate_twocell() - Generic translate for direct two cell
1217 * bindings
1218 * @d: Interrupt domain involved in the translation
1219 * @fwspec: The firmware interrupt specifier to translate
1220 * @out_hwirq: Pointer to storage for the hardware interrupt number
1221 * @out_type: Pointer to storage for the interrupt type
1222 *
1223 * Device Tree IRQ specifier translation function which works with two cell
1224 * bindings where the cell values map directly to the hwirq number
1225 * and linux irq flags.
1226 */
1227int irq_domain_translate_twocell(struct irq_domain *d,
1228 struct irq_fwspec *fwspec,
1229 unsigned long *out_hwirq,
1230 unsigned int *out_type)
1231{
1232 if (WARN_ON(fwspec->param_count < 2))
1233 return -EINVAL;
1234 *out_hwirq = fwspec->param[0];
1235 *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1236 return 0;
1237}
1238EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1239
1240/**
1241 * irq_domain_translate_twothreecell() - Generic translate for direct two or three cell
1242 * bindings
1243 * @d: Interrupt domain involved in the translation
1244 * @fwspec: The firmware interrupt specifier to translate
1245 * @out_hwirq: Pointer to storage for the hardware interrupt number
1246 * @out_type: Pointer to storage for the interrupt type
1247 *
1248 * Firmware interrupt specifier translation function for two or three cell
1249 * specifications, where the parameter values map directly to the hardware
1250 * interrupt number and the type specifier.
1251 */
1252int irq_domain_translate_twothreecell(struct irq_domain *d, struct irq_fwspec *fwspec,
1253 unsigned long *out_hwirq, unsigned int *out_type)
1254{
1255 if (fwspec->param_count == 2) {
1256 *out_hwirq = fwspec->param[0];
1257 *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1258 return 0;
1259 }
1260
1261 if (fwspec->param_count == 3) {
1262 *out_hwirq = fwspec->param[1];
1263 *out_type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1264 return 0;
1265 }
1266
1267 return -EINVAL;
1268}
1269EXPORT_SYMBOL_GPL(irq_domain_translate_twothreecell);
1270
1271int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1272 int node, const struct irq_affinity_desc *affinity)
1273{
1274 unsigned int hint;
1275
1276 if (virq >= 0) {
1277 virq = __irq_alloc_descs(irq: virq, from: virq, cnt, node, THIS_MODULE,
1278 affinity);
1279 } else {
1280 hint = hwirq % irq_get_nr_irqs();
1281 if (hint == 0)
1282 hint++;
1283 virq = __irq_alloc_descs(irq: -1, from: hint, cnt, node, THIS_MODULE,
1284 affinity);
1285 if (virq <= 0 && hint > 1) {
1286 virq = __irq_alloc_descs(irq: -1, from: 1, cnt, node, THIS_MODULE,
1287 affinity);
1288 }
1289 }
1290
1291 return virq;
1292}
1293
1294/**
1295 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1296 * @irq_data: The pointer to irq_data
1297 */
1298void irq_domain_reset_irq_data(struct irq_data *irq_data)
1299{
1300 irq_data->hwirq = 0;
1301 irq_data->chip = &no_irq_chip;
1302 irq_data->chip_data = NULL;
1303}
1304EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1305
1306#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1307static void irq_domain_insert_irq(int virq)
1308{
1309 struct irq_data *data;
1310
1311 for (data = irq_get_irq_data(irq: virq); data; data = data->parent_data) {
1312 struct irq_domain *domain = data->domain;
1313
1314 domain->mapcount++;
1315 irq_domain_set_mapping(domain, hwirq: data->hwirq, irq_data: data);
1316 }
1317
1318 irq_clear_status_flags(irq: virq, clr: IRQ_NOREQUEST);
1319}
1320
1321static void irq_domain_remove_irq(int virq)
1322{
1323 struct irq_data *data;
1324
1325 irq_set_status_flags(irq: virq, set: IRQ_NOREQUEST);
1326 irq_set_chip_and_handler(irq: virq, NULL, NULL);
1327 synchronize_irq(irq: virq);
1328 smp_mb();
1329
1330 for (data = irq_get_irq_data(irq: virq); data; data = data->parent_data) {
1331 struct irq_domain *domain = data->domain;
1332 irq_hw_number_t hwirq = data->hwirq;
1333
1334 domain->mapcount--;
1335 irq_domain_clear_mapping(domain, hwirq);
1336 }
1337}
1338
1339static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1340 struct irq_data *child)
1341{
1342 struct irq_data *irq_data;
1343
1344 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1345 irq_data_get_node(child));
1346 if (irq_data) {
1347 child->parent_data = irq_data;
1348 irq_data->irq = child->irq;
1349 irq_data->common = child->common;
1350 irq_data->domain = domain;
1351 }
1352
1353 return irq_data;
1354}
1355
1356static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1357{
1358 struct irq_data *tmp;
1359
1360 while (irq_data) {
1361 tmp = irq_data;
1362 irq_data = irq_data->parent_data;
1363 kfree(objp: tmp);
1364 }
1365}
1366
1367static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1368{
1369 struct irq_data *irq_data, *tmp;
1370 int i;
1371
1372 for (i = 0; i < nr_irqs; i++) {
1373 irq_data = irq_get_irq_data(irq: virq + i);
1374 tmp = irq_data->parent_data;
1375 irq_data->parent_data = NULL;
1376 irq_data->domain = NULL;
1377
1378 __irq_domain_free_hierarchy(irq_data: tmp);
1379 }
1380}
1381
1382/**
1383 * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1384 * @domain: IRQ domain from which the hierarchy is to be disconnected
1385 * @virq: IRQ number where the hierarchy is to be trimmed
1386 *
1387 * Marks the @virq level belonging to @domain as disconnected.
1388 * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1389 * to @domain.
1390 *
1391 * Its only use is to be able to trim levels of hierarchy that do not
1392 * have any real meaning for this interrupt, and that the driver marks
1393 * as such from its .alloc() callback.
1394 */
1395int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1396 unsigned int virq)
1397{
1398 struct irq_data *irqd;
1399
1400 irqd = irq_domain_get_irq_data(domain, virq);
1401 if (!irqd)
1402 return -EINVAL;
1403
1404 irqd->chip = ERR_PTR(error: -ENOTCONN);
1405 return 0;
1406}
1407EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1408
1409static int irq_domain_trim_hierarchy(unsigned int virq)
1410{
1411 struct irq_data *tail, *irqd, *irq_data;
1412
1413 irq_data = irq_get_irq_data(irq: virq);
1414 tail = NULL;
1415
1416 /* The first entry must have a valid irqchip */
1417 if (IS_ERR_OR_NULL(ptr: irq_data->chip))
1418 return -EINVAL;
1419
1420 /*
1421 * Validate that the irq_data chain is sane in the presence of
1422 * a hierarchy trimming marker.
1423 */
1424 for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1425 /* Can't have a valid irqchip after a trim marker */
1426 if (irqd->chip && tail)
1427 return -EINVAL;
1428
1429 /* Can't have an empty irqchip before a trim marker */
1430 if (!irqd->chip && !tail)
1431 return -EINVAL;
1432
1433 if (IS_ERR(ptr: irqd->chip)) {
1434 /* Only -ENOTCONN is a valid trim marker */
1435 if (PTR_ERR(ptr: irqd->chip) != -ENOTCONN)
1436 return -EINVAL;
1437
1438 tail = irq_data;
1439 }
1440 }
1441
1442 /* No trim marker, nothing to do */
1443 if (!tail)
1444 return 0;
1445
1446 pr_info("IRQ%d: trimming hierarchy from %s\n",
1447 virq, tail->parent_data->domain->name);
1448
1449 /* Sever the inner part of the hierarchy... */
1450 irqd = tail;
1451 tail = tail->parent_data;
1452 irqd->parent_data = NULL;
1453 __irq_domain_free_hierarchy(irq_data: tail);
1454
1455 return 0;
1456}
1457
1458static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1459 unsigned int virq, unsigned int nr_irqs)
1460{
1461 struct irq_data *irq_data;
1462 struct irq_domain *parent;
1463 int i;
1464
1465 /* The outermost irq_data is embedded in struct irq_desc */
1466 for (i = 0; i < nr_irqs; i++) {
1467 irq_data = irq_get_irq_data(irq: virq + i);
1468 irq_data->domain = domain;
1469
1470 for (parent = domain->parent; parent; parent = parent->parent) {
1471 irq_data = irq_domain_insert_irq_data(domain: parent, child: irq_data);
1472 if (!irq_data) {
1473 irq_domain_free_irq_data(virq, nr_irqs: i + 1);
1474 return -ENOMEM;
1475 }
1476 }
1477 }
1478
1479 return 0;
1480}
1481
1482/**
1483 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1484 * @domain: domain to match
1485 * @virq: IRQ number to get irq_data
1486 */
1487struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1488 unsigned int virq)
1489{
1490 struct irq_data *irq_data;
1491
1492 for (irq_data = irq_get_irq_data(irq: virq); irq_data;
1493 irq_data = irq_data->parent_data)
1494 if (irq_data->domain == domain)
1495 return irq_data;
1496
1497 return NULL;
1498}
1499EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1500
1501/**
1502 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1503 * @domain: Interrupt domain to match
1504 * @virq: IRQ number
1505 * @hwirq: The hwirq number
1506 * @chip: The associated interrupt chip
1507 * @chip_data: The associated chip data
1508 */
1509int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1510 irq_hw_number_t hwirq,
1511 const struct irq_chip *chip,
1512 void *chip_data)
1513{
1514 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1515
1516 if (!irq_data)
1517 return -ENOENT;
1518
1519 irq_data->hwirq = hwirq;
1520 irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1521 irq_data->chip_data = chip_data;
1522
1523 return 0;
1524}
1525EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1526
1527/**
1528 * irq_domain_set_info - Set the complete data for a @virq in @domain
1529 * @domain: Interrupt domain to match
1530 * @virq: IRQ number
1531 * @hwirq: The hardware interrupt number
1532 * @chip: The associated interrupt chip
1533 * @chip_data: The associated interrupt chip data
1534 * @handler: The interrupt flow handler
1535 * @handler_data: The interrupt flow handler data
1536 * @handler_name: The interrupt handler name
1537 */
1538void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1539 irq_hw_number_t hwirq, const struct irq_chip *chip,
1540 void *chip_data, irq_flow_handler_t handler,
1541 void *handler_data, const char *handler_name)
1542{
1543 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1544 __irq_set_handler(irq: virq, handle: handler, is_chained: 0, name: handler_name);
1545 irq_set_handler_data(irq: virq, data: handler_data);
1546}
1547EXPORT_SYMBOL(irq_domain_set_info);
1548
1549/**
1550 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1551 * @domain: Interrupt domain to match
1552 * @virq: IRQ number to start with
1553 * @nr_irqs: The number of irqs to free
1554 */
1555void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1556 unsigned int nr_irqs)
1557{
1558 struct irq_data *irq_data;
1559 int i;
1560
1561 for (i = 0; i < nr_irqs; i++) {
1562 irq_data = irq_domain_get_irq_data(domain, virq + i);
1563 if (irq_data)
1564 irq_domain_reset_irq_data(irq_data);
1565 }
1566 irq_domain_free_irqs_parent(domain, irq_base: virq, nr_irqs);
1567}
1568EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1569
1570/**
1571 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1572 * @domain: Interrupt domain to match
1573 * @virq: IRQ number to start with
1574 * @nr_irqs: The number of irqs to free
1575 */
1576void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1577 unsigned int nr_irqs)
1578{
1579 int i;
1580
1581 for (i = 0; i < nr_irqs; i++) {
1582 irq_set_handler_data(irq: virq + i, NULL);
1583 irq_set_handler(irq: virq + i, NULL);
1584 }
1585 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1586}
1587EXPORT_SYMBOL_GPL(irq_domain_free_irqs_top);
1588
1589static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1590 unsigned int irq_base,
1591 unsigned int nr_irqs)
1592{
1593 unsigned int i;
1594
1595 if (!domain->ops->free)
1596 return;
1597
1598 for (i = 0; i < nr_irqs; i++) {
1599 if (irq_domain_get_irq_data(domain, irq_base + i))
1600 domain->ops->free(domain, irq_base + i, 1);
1601 }
1602}
1603
1604static int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain, unsigned int irq_base,
1605 unsigned int nr_irqs, void *arg)
1606{
1607 if (!domain->ops->alloc) {
1608 pr_debug("domain->ops->alloc() is NULL\n");
1609 return -ENOSYS;
1610 }
1611
1612 return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1613}
1614
1615static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1616 unsigned int nr_irqs, int node, void *arg,
1617 bool realloc, const struct irq_affinity_desc *affinity)
1618{
1619 int i, ret, virq;
1620
1621 if (realloc && irq_base >= 0) {
1622 virq = irq_base;
1623 } else {
1624 virq = irq_domain_alloc_descs(virq: irq_base, cnt: nr_irqs, hwirq: 0, node,
1625 affinity);
1626 if (virq < 0) {
1627 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1628 irq_base, nr_irqs);
1629 return virq;
1630 }
1631 }
1632
1633 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1634 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1635 ret = -ENOMEM;
1636 goto out_free_desc;
1637 }
1638
1639 ret = irq_domain_alloc_irqs_hierarchy(domain, irq_base: virq, nr_irqs, arg);
1640 if (ret < 0)
1641 goto out_free_irq_data;
1642
1643 for (i = 0; i < nr_irqs; i++) {
1644 ret = irq_domain_trim_hierarchy(virq: virq + i);
1645 if (ret)
1646 goto out_free_irq_data;
1647 }
1648
1649 for (i = 0; i < nr_irqs; i++)
1650 irq_domain_insert_irq(virq: virq + i);
1651
1652 return virq;
1653
1654out_free_irq_data:
1655 irq_domain_free_irq_data(virq, nr_irqs);
1656out_free_desc:
1657 irq_free_descs(irq: virq, cnt: nr_irqs);
1658 return ret;
1659}
1660
1661/**
1662 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1663 * @domain: domain to allocate from
1664 * @irq_base: allocate specified IRQ number if irq_base >= 0
1665 * @nr_irqs: number of IRQs to allocate
1666 * @node: NUMA node id for memory allocation
1667 * @arg: domain specific argument
1668 * @realloc: IRQ descriptors have already been allocated if true
1669 * @affinity: Optional irq affinity mask for multiqueue devices
1670 *
1671 * Allocate IRQ numbers and initialized all data structures to support
1672 * hierarchy IRQ domains.
1673 * Parameter @realloc is mainly to support legacy IRQs.
1674 * Returns error code or allocated IRQ number
1675 *
1676 * The whole process to setup an IRQ has been split into two steps.
1677 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1678 * descriptor and required hardware resources. The second step,
1679 * irq_domain_activate_irq(), is to program the hardware with preallocated
1680 * resources. In this way, it's easier to rollback when failing to
1681 * allocate resources.
1682 */
1683int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1684 unsigned int nr_irqs, int node, void *arg,
1685 bool realloc, const struct irq_affinity_desc *affinity)
1686{
1687 int ret;
1688
1689 if (domain == NULL) {
1690 domain = irq_default_domain;
1691 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1692 return -EINVAL;
1693 }
1694
1695 mutex_lock(&domain->root->mutex);
1696 ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1697 realloc, affinity);
1698 mutex_unlock(lock: &domain->root->mutex);
1699
1700 return ret;
1701}
1702EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1703
1704/* The irq_data was moved, fix the revmap to refer to the new location */
1705static void irq_domain_fix_revmap(struct irq_data *d)
1706{
1707 void __rcu **slot;
1708
1709 lockdep_assert_held(&d->domain->root->mutex);
1710
1711 if (irq_domain_is_nomap(domain: d->domain))
1712 return;
1713
1714 /* Fix up the revmap. */
1715 if (d->hwirq < d->domain->revmap_size) {
1716 /* Not using radix tree */
1717 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1718 } else {
1719 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, index: d->hwirq);
1720 if (slot)
1721 radix_tree_replace_slot(&d->domain->revmap_tree, slot, entry: d);
1722 }
1723}
1724
1725/**
1726 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1727 * @domain: Domain to push.
1728 * @virq: Irq to push the domain in to.
1729 * @arg: Passed to the irq_domain_ops alloc() function.
1730 *
1731 * For an already existing irqdomain hierarchy, as might be obtained
1732 * via a call to pci_enable_msix(), add an additional domain to the
1733 * head of the processing chain. Must be called before request_irq()
1734 * has been called.
1735 */
1736int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1737{
1738 struct irq_data *irq_data = irq_get_irq_data(irq: virq);
1739 struct irq_data *parent_irq_data;
1740 struct irq_desc *desc;
1741 int rv = 0;
1742
1743 /*
1744 * Check that no action has been set, which indicates the virq
1745 * is in a state where this function doesn't have to deal with
1746 * races between interrupt handling and maintaining the
1747 * hierarchy. This will catch gross misuse. Attempting to
1748 * make the check race free would require holding locks across
1749 * calls to struct irq_domain_ops->alloc(), which could lead
1750 * to deadlock, so we just do a simple check before starting.
1751 */
1752 desc = irq_to_desc(irq: virq);
1753 if (!desc)
1754 return -EINVAL;
1755 if (WARN_ON(desc->action))
1756 return -EBUSY;
1757
1758 if (domain == NULL)
1759 return -EINVAL;
1760
1761 if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1762 return -EINVAL;
1763
1764 if (!irq_data)
1765 return -EINVAL;
1766
1767 if (domain->parent != irq_data->domain)
1768 return -EINVAL;
1769
1770 parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1771 irq_data_get_node(irq_data));
1772 if (!parent_irq_data)
1773 return -ENOMEM;
1774
1775 mutex_lock(&domain->root->mutex);
1776
1777 /* Copy the original irq_data. */
1778 *parent_irq_data = *irq_data;
1779
1780 /*
1781 * Overwrite the irq_data, which is embedded in struct irq_desc, with
1782 * values for this domain.
1783 */
1784 irq_data->parent_data = parent_irq_data;
1785 irq_data->domain = domain;
1786 irq_data->mask = 0;
1787 irq_data->hwirq = 0;
1788 irq_data->chip = NULL;
1789 irq_data->chip_data = NULL;
1790
1791 /* May (probably does) set hwirq, chip, etc. */
1792 rv = irq_domain_alloc_irqs_hierarchy(domain, irq_base: virq, nr_irqs: 1, arg);
1793 if (rv) {
1794 /* Restore the original irq_data. */
1795 *irq_data = *parent_irq_data;
1796 kfree(objp: parent_irq_data);
1797 goto error;
1798 }
1799
1800 irq_domain_fix_revmap(d: parent_irq_data);
1801 irq_domain_set_mapping(domain, hwirq: irq_data->hwirq, irq_data);
1802error:
1803 mutex_unlock(lock: &domain->root->mutex);
1804
1805 return rv;
1806}
1807EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1808
1809/**
1810 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1811 * @domain: Domain to remove.
1812 * @virq: Irq to remove the domain from.
1813 *
1814 * Undo the effects of a call to irq_domain_push_irq(). Must be
1815 * called either before request_irq() or after free_irq().
1816 */
1817int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1818{
1819 struct irq_data *irq_data = irq_get_irq_data(irq: virq);
1820 struct irq_data *parent_irq_data;
1821 struct irq_data *tmp_irq_data;
1822 struct irq_desc *desc;
1823
1824 /*
1825 * Check that no action is set, which indicates the virq is in
1826 * a state where this function doesn't have to deal with races
1827 * between interrupt handling and maintaining the hierarchy.
1828 * This will catch gross misuse. Attempting to make the check
1829 * race free would require holding locks across calls to
1830 * struct irq_domain_ops->free(), which could lead to
1831 * deadlock, so we just do a simple check before starting.
1832 */
1833 desc = irq_to_desc(irq: virq);
1834 if (!desc)
1835 return -EINVAL;
1836 if (WARN_ON(desc->action))
1837 return -EBUSY;
1838
1839 if (domain == NULL)
1840 return -EINVAL;
1841
1842 if (!irq_data)
1843 return -EINVAL;
1844
1845 tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1846
1847 /* We can only "pop" if this domain is at the top of the list */
1848 if (WARN_ON(irq_data != tmp_irq_data))
1849 return -EINVAL;
1850
1851 if (WARN_ON(irq_data->domain != domain))
1852 return -EINVAL;
1853
1854 parent_irq_data = irq_data->parent_data;
1855 if (WARN_ON(!parent_irq_data))
1856 return -EINVAL;
1857
1858 mutex_lock(&domain->root->mutex);
1859
1860 irq_data->parent_data = NULL;
1861
1862 irq_domain_clear_mapping(domain, hwirq: irq_data->hwirq);
1863 irq_domain_free_irqs_hierarchy(domain, irq_base: virq, nr_irqs: 1);
1864
1865 /* Restore the original irq_data. */
1866 *irq_data = *parent_irq_data;
1867
1868 irq_domain_fix_revmap(d: irq_data);
1869
1870 mutex_unlock(lock: &domain->root->mutex);
1871
1872 kfree(objp: parent_irq_data);
1873
1874 return 0;
1875}
1876EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1877
1878/**
1879 * irq_domain_free_irqs - Free IRQ number and associated data structures
1880 * @virq: base IRQ number
1881 * @nr_irqs: number of IRQs to free
1882 */
1883void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1884{
1885 struct irq_data *data = irq_get_irq_data(irq: virq);
1886 struct irq_domain *domain;
1887 int i;
1888
1889 if (WARN(!data || !data->domain || !data->domain->ops->free,
1890 "NULL pointer, cannot free irq\n"))
1891 return;
1892
1893 domain = data->domain;
1894
1895 mutex_lock(&domain->root->mutex);
1896 for (i = 0; i < nr_irqs; i++)
1897 irq_domain_remove_irq(virq: virq + i);
1898 irq_domain_free_irqs_hierarchy(domain, irq_base: virq, nr_irqs);
1899 mutex_unlock(lock: &domain->root->mutex);
1900
1901 irq_domain_free_irq_data(virq, nr_irqs);
1902 irq_free_descs(irq: virq, cnt: nr_irqs);
1903}
1904
1905static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq)
1906{
1907 if (irq_domain_is_msi_device(domain))
1908 msi_device_domain_free_wired(domain, virq);
1909 else
1910 irq_domain_free_irqs(virq, nr_irqs: 1);
1911}
1912
1913/**
1914 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1915 * @domain: Domain below which interrupts must be allocated
1916 * @irq_base: Base IRQ number
1917 * @nr_irqs: Number of IRQs to allocate
1918 * @arg: Allocation data (arch/domain specific)
1919 */
1920int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1921 unsigned int irq_base, unsigned int nr_irqs,
1922 void *arg)
1923{
1924 if (!domain->parent)
1925 return -ENOSYS;
1926
1927 return irq_domain_alloc_irqs_hierarchy(domain: domain->parent, irq_base,
1928 nr_irqs, arg);
1929}
1930EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1931
1932/**
1933 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1934 * @domain: Domain below which interrupts must be freed
1935 * @irq_base: Base IRQ number
1936 * @nr_irqs: Number of IRQs to free
1937 */
1938void irq_domain_free_irqs_parent(struct irq_domain *domain,
1939 unsigned int irq_base, unsigned int nr_irqs)
1940{
1941 if (!domain->parent)
1942 return;
1943
1944 irq_domain_free_irqs_hierarchy(domain: domain->parent, irq_base, nr_irqs);
1945}
1946EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1947
1948static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1949{
1950 if (irq_data && irq_data->domain) {
1951 struct irq_domain *domain = irq_data->domain;
1952
1953 if (domain->ops->deactivate)
1954 domain->ops->deactivate(domain, irq_data);
1955 if (irq_data->parent_data)
1956 __irq_domain_deactivate_irq(irq_data: irq_data->parent_data);
1957 }
1958}
1959
1960static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1961{
1962 int ret = 0;
1963
1964 if (irqd && irqd->domain) {
1965 struct irq_domain *domain = irqd->domain;
1966
1967 if (irqd->parent_data)
1968 ret = __irq_domain_activate_irq(irqd: irqd->parent_data,
1969 reserve);
1970 if (!ret && domain->ops->activate) {
1971 ret = domain->ops->activate(domain, irqd, reserve);
1972 /* Rollback in case of error */
1973 if (ret && irqd->parent_data)
1974 __irq_domain_deactivate_irq(irq_data: irqd->parent_data);
1975 }
1976 }
1977 return ret;
1978}
1979
1980/**
1981 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1982 * interrupt
1983 * @irq_data: Outermost irq_data associated with interrupt
1984 * @reserve: If set only reserve an interrupt vector instead of assigning one
1985 *
1986 * This is the second step to call domain_ops->activate to program interrupt
1987 * controllers, so the interrupt could actually get delivered.
1988 */
1989int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1990{
1991 int ret = 0;
1992
1993 if (!irqd_is_activated(d: irq_data))
1994 ret = __irq_domain_activate_irq(irqd: irq_data, reserve);
1995 if (!ret)
1996 irqd_set_activated(d: irq_data);
1997 return ret;
1998}
1999
2000/**
2001 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
2002 * deactivate interrupt
2003 * @irq_data: outermost irq_data associated with interrupt
2004 *
2005 * It calls domain_ops->deactivate to program interrupt controllers to disable
2006 * interrupt delivery.
2007 */
2008void irq_domain_deactivate_irq(struct irq_data *irq_data)
2009{
2010 if (irqd_is_activated(d: irq_data)) {
2011 __irq_domain_deactivate_irq(irq_data);
2012 irqd_clr_activated(d: irq_data);
2013 }
2014}
2015
2016static void irq_domain_check_hierarchy(struct irq_domain *domain)
2017{
2018 /* Hierarchy irq_domains must implement callback alloc() */
2019 if (domain->ops->alloc)
2020 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
2021}
2022#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
2023/*
2024 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
2025 * @domain: domain to match
2026 * @virq: IRQ number to get irq_data
2027 */
2028struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
2029 unsigned int virq)
2030{
2031 struct irq_data *irq_data = irq_get_irq_data(virq);
2032
2033 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
2034}
2035EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
2036
2037/*
2038 * irq_domain_set_info - Set the complete data for a @virq in @domain
2039 * @domain: Interrupt domain to match
2040 * @virq: IRQ number
2041 * @hwirq: The hardware interrupt number
2042 * @chip: The associated interrupt chip
2043 * @chip_data: The associated interrupt chip data
2044 * @handler: The interrupt flow handler
2045 * @handler_data: The interrupt flow handler data
2046 * @handler_name: The interrupt handler name
2047 */
2048void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
2049 irq_hw_number_t hwirq, const struct irq_chip *chip,
2050 void *chip_data, irq_flow_handler_t handler,
2051 void *handler_data, const char *handler_name)
2052{
2053 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
2054 irq_set_chip_data(virq, chip_data);
2055 irq_set_handler_data(virq, handler_data);
2056}
2057
2058static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
2059 unsigned int nr_irqs, int node, void *arg,
2060 bool realloc, const struct irq_affinity_desc *affinity)
2061{
2062 return -EINVAL;
2063}
2064
2065static void irq_domain_check_hierarchy(struct irq_domain *domain) { }
2066static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq) { }
2067
2068#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
2069
2070#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
2071#include "internals.h"
2072
2073static struct dentry *domain_dir;
2074
2075static const struct irq_bit_descr irqdomain_flags[] = {
2076 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_HIERARCHY),
2077 BIT_MASK_DESCR(IRQ_DOMAIN_NAME_ALLOCATED),
2078 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_IPI_PER_CPU),
2079 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_IPI_SINGLE),
2080 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI),
2081 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_ISOLATED_MSI),
2082 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_NO_MAP),
2083 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI_PARENT),
2084 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI_DEVICE),
2085 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_NONCORE),
2086};
2087
2088static void irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
2089{
2090 seq_printf(m, fmt: "%*sname: %s\n", ind, "", d->name);
2091 seq_printf(m, fmt: "%*ssize: %u\n", ind + 1, "", d->revmap_size);
2092 seq_printf(m, fmt: "%*smapped: %u\n", ind + 1, "", d->mapcount);
2093 seq_printf(m, fmt: "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
2094 irq_debug_show_bits(m, ind, state: d->flags, sd: irqdomain_flags, ARRAY_SIZE(irqdomain_flags));
2095 if (d->ops && d->ops->debug_show)
2096 d->ops->debug_show(m, d, NULL, ind + 1);
2097#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2098 if (!d->parent)
2099 return;
2100 seq_printf(m, fmt: "%*sparent: %s\n", ind + 1, "", d->parent->name);
2101 irq_domain_debug_show_one(m, d: d->parent, ind: ind + 4);
2102#endif
2103}
2104
2105static int irq_domain_debug_show(struct seq_file *m, void *p)
2106{
2107 struct irq_domain *d = m->private;
2108
2109 /* Default domain? Might be NULL */
2110 if (!d) {
2111 if (!irq_default_domain)
2112 return 0;
2113 d = irq_default_domain;
2114 }
2115 irq_domain_debug_show_one(m, d, ind: 0);
2116 return 0;
2117}
2118DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
2119
2120static void debugfs_add_domain_dir(struct irq_domain *d)
2121{
2122 if (!d->name || !domain_dir)
2123 return;
2124 debugfs_create_file(d->name, 0444, domain_dir, d,
2125 &irq_domain_debug_fops);
2126}
2127
2128static void debugfs_remove_domain_dir(struct irq_domain *d)
2129{
2130 debugfs_lookup_and_remove(name: d->name, parent: domain_dir);
2131}
2132
2133void __init irq_domain_debugfs_init(struct dentry *root)
2134{
2135 struct irq_domain *d;
2136
2137 domain_dir = debugfs_create_dir(name: "domains", parent: root);
2138
2139 debugfs_create_file("default", 0444, domain_dir, NULL,
2140 &irq_domain_debug_fops);
2141 mutex_lock(&irq_domain_mutex);
2142 list_for_each_entry(d, &irq_domain_list, link)
2143 debugfs_add_domain_dir(d);
2144 mutex_unlock(lock: &irq_domain_mutex);
2145}
2146#endif
2147

source code of linux/kernel/irq/irqdomain.c