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1#define pr_fmt(fmt) "irq: " fmt
2
3#include <linux/debugfs.h>
4#include <linux/hardirq.h>
5#include <linux/interrupt.h>
6#include <linux/irq.h>
7#include <linux/irqdesc.h>
8#include <linux/irqdomain.h>
9#include <linux/module.h>
10#include <linux/mutex.h>
11#include <linux/of.h>
12#include <linux/of_address.h>
13#include <linux/of_irq.h>
14#include <linux/topology.h>
15#include <linux/seq_file.h>
16#include <linux/slab.h>
17#include <linux/smp.h>
18#include <linux/fs.h>
19
20static LIST_HEAD(irq_domain_list);
21static DEFINE_MUTEX(irq_domain_mutex);
22
23static DEFINE_MUTEX(revmap_trees_mutex);
24static struct irq_domain *irq_default_domain;
25
26static void irq_domain_check_hierarchy(struct irq_domain *domain);
27
28struct irqchip_fwid {
29 struct fwnode_handle fwnode;
30 char *name;
31 void *data;
32};
33
34/**
35 * irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
36 * identifying an irq domain
37 * @data: optional user-provided data
38 *
39 * Allocate a struct device_node, and return a poiner to the embedded
40 * fwnode_handle (or NULL on failure).
41 */
42struct fwnode_handle *irq_domain_alloc_fwnode(void *data)
43{
44 struct irqchip_fwid *fwid;
45 char *name;
46
47 fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
48 name = kasprintf(GFP_KERNEL, "irqchip@%p", data);
49
50 if (!fwid || !name) {
51 kfree(fwid);
52 kfree(name);
53 return NULL;
54 }
55
56 fwid->name = name;
57 fwid->data = data;
58 fwid->fwnode.type = FWNODE_IRQCHIP;
59 return &fwid->fwnode;
60}
61EXPORT_SYMBOL_GPL(irq_domain_alloc_fwnode);
62
63/**
64 * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
65 *
66 * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
67 */
68void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
69{
70 struct irqchip_fwid *fwid;
71
72 if (WARN_ON(!is_fwnode_irqchip(fwnode)))
73 return;
74
75 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
76 kfree(fwid->name);
77 kfree(fwid);
78}
79EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
80
81/**
82 * __irq_domain_add() - Allocate a new irq_domain data structure
83 * @fwnode: firmware node for the interrupt controller
84 * @size: Size of linear map; 0 for radix mapping only
85 * @hwirq_max: Maximum number of interrupts supported by controller
86 * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
87 * direct mapping
88 * @ops: domain callbacks
89 * @host_data: Controller private data pointer
90 *
91 * Allocates and initialize and irq_domain structure.
92 * Returns pointer to IRQ domain, or NULL on failure.
93 */
94struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
95 irq_hw_number_t hwirq_max, int direct_max,
96 const struct irq_domain_ops *ops,
97 void *host_data)
98{
99 struct device_node *of_node = to_of_node(fwnode);
100 struct irq_domain *domain;
101
102 domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
103 GFP_KERNEL, of_node_to_nid(of_node));
104 if (WARN_ON(!domain))
105 return NULL;
106
107 of_node_get(of_node);
108
109 /* Fill structure */
110 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
111 domain->ops = ops;
112 domain->host_data = host_data;
113 domain->fwnode = fwnode;
114 domain->hwirq_max = hwirq_max;
115 domain->revmap_size = size;
116 domain->revmap_direct_max_irq = direct_max;
117 irq_domain_check_hierarchy(domain);
118
119 mutex_lock(&irq_domain_mutex);
120 list_add(&domain->link, &irq_domain_list);
121 mutex_unlock(&irq_domain_mutex);
122
123 pr_debug("Added domain %s\n", domain->name);
124 return domain;
125}
126EXPORT_SYMBOL_GPL(__irq_domain_add);
127
128/**
129 * irq_domain_remove() - Remove an irq domain.
130 * @domain: domain to remove
131 *
132 * This routine is used to remove an irq domain. The caller must ensure
133 * that all mappings within the domain have been disposed of prior to
134 * use, depending on the revmap type.
135 */
136void irq_domain_remove(struct irq_domain *domain)
137{
138 mutex_lock(&irq_domain_mutex);
139
140 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
141
142 list_del(&domain->link);
143
144 /*
145 * If the going away domain is the default one, reset it.
146 */
147 if (unlikely(irq_default_domain == domain))
148 irq_set_default_host(NULL);
149
150 mutex_unlock(&irq_domain_mutex);
151
152 pr_debug("Removed domain %s\n", domain->name);
153
154 of_node_put(irq_domain_get_of_node(domain));
155 kfree(domain);
156}
157EXPORT_SYMBOL_GPL(irq_domain_remove);
158
159/**
160 * irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
161 * @of_node: pointer to interrupt controller's device tree node.
162 * @size: total number of irqs in mapping
163 * @first_irq: first number of irq block assigned to the domain,
164 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
165 * pre-map all of the irqs in the domain to virqs starting at first_irq.
166 * @ops: domain callbacks
167 * @host_data: Controller private data pointer
168 *
169 * Allocates an irq_domain, and optionally if first_irq is positive then also
170 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
171 *
172 * This is intended to implement the expected behaviour for most
173 * interrupt controllers. If device tree is used, then first_irq will be 0 and
174 * irqs get mapped dynamically on the fly. However, if the controller requires
175 * static virq assignments (non-DT boot) then it will set that up correctly.
176 */
177struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
178 unsigned int size,
179 unsigned int first_irq,
180 const struct irq_domain_ops *ops,
181 void *host_data)
182{
183 struct irq_domain *domain;
184
185 domain = __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
186 if (!domain)
187 return NULL;
188
189 if (first_irq > 0) {
190 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
191 /* attempt to allocated irq_descs */
192 int rc = irq_alloc_descs(first_irq, first_irq, size,
193 of_node_to_nid(of_node));
194 if (rc < 0)
195 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
196 first_irq);
197 }
198 irq_domain_associate_many(domain, first_irq, 0, size);
199 }
200
201 return domain;
202}
203EXPORT_SYMBOL_GPL(irq_domain_add_simple);
204
205/**
206 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
207 * @of_node: pointer to interrupt controller's device tree node.
208 * @size: total number of irqs in legacy mapping
209 * @first_irq: first number of irq block assigned to the domain
210 * @first_hwirq: first hwirq number to use for the translation. Should normally
211 * be '0', but a positive integer can be used if the effective
212 * hwirqs numbering does not begin at zero.
213 * @ops: map/unmap domain callbacks
214 * @host_data: Controller private data pointer
215 *
216 * Note: the map() callback will be called before this function returns
217 * for all legacy interrupts except 0 (which is always the invalid irq for
218 * a legacy controller).
219 */
220struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
221 unsigned int size,
222 unsigned int first_irq,
223 irq_hw_number_t first_hwirq,
224 const struct irq_domain_ops *ops,
225 void *host_data)
226{
227 struct irq_domain *domain;
228
229 domain = __irq_domain_add(of_node_to_fwnode(of_node), first_hwirq + size,
230 first_hwirq + size, 0, ops, host_data);
231 if (domain)
232 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
233
234 return domain;
235}
236EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
237
238/**
239 * irq_find_matching_fwspec() - Locates a domain for a given fwspec
240 * @fwspec: FW specifier for an interrupt
241 * @bus_token: domain-specific data
242 */
243struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
244 enum irq_domain_bus_token bus_token)
245{
246 struct irq_domain *h, *found = NULL;
247 struct fwnode_handle *fwnode = fwspec->fwnode;
248 int rc;
249
250 /* We might want to match the legacy controller last since
251 * it might potentially be set to match all interrupts in
252 * the absence of a device node. This isn't a problem so far
253 * yet though...
254 *
255 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
256 * values must generate an exact match for the domain to be
257 * selected.
258 */
259 mutex_lock(&irq_domain_mutex);
260 list_for_each_entry(h, &irq_domain_list, link) {
261 if (h->ops->select && fwspec->param_count)
262 rc = h->ops->select(h, fwspec, bus_token);
263 else if (h->ops->match)
264 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
265 else
266 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
267 ((bus_token == DOMAIN_BUS_ANY) ||
268 (h->bus_token == bus_token)));
269
270 if (rc) {
271 found = h;
272 break;
273 }
274 }
275 mutex_unlock(&irq_domain_mutex);
276 return found;
277}
278EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
279
280/**
281 * irq_set_default_host() - Set a "default" irq domain
282 * @domain: default domain pointer
283 *
284 * For convenience, it's possible to set a "default" domain that will be used
285 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
286 * platforms that want to manipulate a few hard coded interrupt numbers that
287 * aren't properly represented in the device-tree.
288 */
289void irq_set_default_host(struct irq_domain *domain)
290{
291 pr_debug("Default domain set to @0x%p\n", domain);
292
293 irq_default_domain = domain;
294}
295EXPORT_SYMBOL_GPL(irq_set_default_host);
296
297void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
298{
299 struct irq_data *irq_data = irq_get_irq_data(irq);
300 irq_hw_number_t hwirq;
301
302 if (WARN(!irq_data || irq_data->domain != domain,
303 "virq%i doesn't exist; cannot disassociate\n", irq))
304 return;
305
306 hwirq = irq_data->hwirq;
307 irq_set_status_flags(irq, IRQ_NOREQUEST);
308
309 /* remove chip and handler */
310 irq_set_chip_and_handler(irq, NULL, NULL);
311
312 /* Make sure it's completed */
313 synchronize_irq(irq);
314
315 /* Tell the PIC about it */
316 if (domain->ops->unmap)
317 domain->ops->unmap(domain, irq);
318 smp_mb();
319
320 irq_data->domain = NULL;
321 irq_data->hwirq = 0;
322
323 /* Clear reverse map for this hwirq */
324 if (hwirq < domain->revmap_size) {
325 domain->linear_revmap[hwirq] = 0;
326 } else {
327 mutex_lock(&revmap_trees_mutex);
328 radix_tree_delete(&domain->revmap_tree, hwirq);
329 mutex_unlock(&revmap_trees_mutex);
330 }
331}
332
333int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
334 irq_hw_number_t hwirq)
335{
336 struct irq_data *irq_data = irq_get_irq_data(virq);
337 int ret;
338
339 if (WARN(hwirq >= domain->hwirq_max,
340 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
341 return -EINVAL;
342 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
343 return -EINVAL;
344 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
345 return -EINVAL;
346
347 mutex_lock(&irq_domain_mutex);
348 irq_data->hwirq = hwirq;
349 irq_data->domain = domain;
350 if (domain->ops->map) {
351 ret = domain->ops->map(domain, virq, hwirq);
352 if (ret != 0) {
353 /*
354 * If map() returns -EPERM, this interrupt is protected
355 * by the firmware or some other service and shall not
356 * be mapped. Don't bother telling the user about it.
357 */
358 if (ret != -EPERM) {
359 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
360 domain->name, hwirq, virq, ret);
361 }
362 irq_data->domain = NULL;
363 irq_data->hwirq = 0;
364 mutex_unlock(&irq_domain_mutex);
365 return ret;
366 }
367
368 /* If not already assigned, give the domain the chip's name */
369 if (!domain->name && irq_data->chip)
370 domain->name = irq_data->chip->name;
371 }
372
373 if (hwirq < domain->revmap_size) {
374 domain->linear_revmap[hwirq] = virq;
375 } else {
376 mutex_lock(&revmap_trees_mutex);
377 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
378 mutex_unlock(&revmap_trees_mutex);
379 }
380 mutex_unlock(&irq_domain_mutex);
381
382 irq_clear_status_flags(virq, IRQ_NOREQUEST);
383
384 return 0;
385}
386EXPORT_SYMBOL_GPL(irq_domain_associate);
387
388void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
389 irq_hw_number_t hwirq_base, int count)
390{
391 struct device_node *of_node;
392 int i;
393
394 of_node = irq_domain_get_of_node(domain);
395 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
396 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
397
398 for (i = 0; i < count; i++) {
399 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
400 }
401}
402EXPORT_SYMBOL_GPL(irq_domain_associate_many);
403
404/**
405 * irq_create_direct_mapping() - Allocate an irq for direct mapping
406 * @domain: domain to allocate the irq for or NULL for default domain
407 *
408 * This routine is used for irq controllers which can choose the hardware
409 * interrupt numbers they generate. In such a case it's simplest to use
410 * the linux irq as the hardware interrupt number. It still uses the linear
411 * or radix tree to store the mapping, but the irq controller can optimize
412 * the revmap path by using the hwirq directly.
413 */
414unsigned int irq_create_direct_mapping(struct irq_domain *domain)
415{
416 struct device_node *of_node;
417 unsigned int virq;
418
419 if (domain == NULL)
420 domain = irq_default_domain;
421
422 of_node = irq_domain_get_of_node(domain);
423 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
424 if (!virq) {
425 pr_debug("create_direct virq allocation failed\n");
426 return 0;
427 }
428 if (virq >= domain->revmap_direct_max_irq) {
429 pr_err("ERROR: no free irqs available below %i maximum\n",
430 domain->revmap_direct_max_irq);
431 irq_free_desc(virq);
432 return 0;
433 }
434 pr_debug("create_direct obtained virq %d\n", virq);
435
436 if (irq_domain_associate(domain, virq, virq)) {
437 irq_free_desc(virq);
438 return 0;
439 }
440
441 return virq;
442}
443EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
444
445/**
446 * irq_create_mapping() - Map a hardware interrupt into linux irq space
447 * @domain: domain owning this hardware interrupt or NULL for default domain
448 * @hwirq: hardware irq number in that domain space
449 *
450 * Only one mapping per hardware interrupt is permitted. Returns a linux
451 * irq number.
452 * If the sense/trigger is to be specified, set_irq_type() should be called
453 * on the number returned from that call.
454 */
455unsigned int irq_create_mapping(struct irq_domain *domain,
456 irq_hw_number_t hwirq)
457{
458 struct device_node *of_node;
459 int virq;
460
461 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
462
463 /* Look for default domain if nececssary */
464 if (domain == NULL)
465 domain = irq_default_domain;
466 if (domain == NULL) {
467 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
468 return 0;
469 }
470 pr_debug("-> using domain @%p\n", domain);
471
472 of_node = irq_domain_get_of_node(domain);
473
474 /* Check if mapping already exists */
475 virq = irq_find_mapping(domain, hwirq);
476 if (virq) {
477 pr_debug("-> existing mapping on virq %d\n", virq);
478 return virq;
479 }
480
481 /* Allocate a virtual interrupt number */
482 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), NULL);
483 if (virq <= 0) {
484 pr_debug("-> virq allocation failed\n");
485 return 0;
486 }
487
488 if (irq_domain_associate(domain, virq, hwirq)) {
489 irq_free_desc(virq);
490 return 0;
491 }
492
493 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
494 hwirq, of_node_full_name(of_node), virq);
495
496 return virq;
497}
498EXPORT_SYMBOL_GPL(irq_create_mapping);
499
500/**
501 * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
502 * @domain: domain owning the interrupt range
503 * @irq_base: beginning of linux IRQ range
504 * @hwirq_base: beginning of hardware IRQ range
505 * @count: Number of interrupts to map
506 *
507 * This routine is used for allocating and mapping a range of hardware
508 * irqs to linux irqs where the linux irq numbers are at pre-defined
509 * locations. For use by controllers that already have static mappings
510 * to insert in to the domain.
511 *
512 * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
513 * domain insertion.
514 *
515 * 0 is returned upon success, while any failure to establish a static
516 * mapping is treated as an error.
517 */
518int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
519 irq_hw_number_t hwirq_base, int count)
520{
521 struct device_node *of_node;
522 int ret;
523
524 of_node = irq_domain_get_of_node(domain);
525 ret = irq_alloc_descs(irq_base, irq_base, count,
526 of_node_to_nid(of_node));
527 if (unlikely(ret < 0))
528 return ret;
529
530 irq_domain_associate_many(domain, irq_base, hwirq_base, count);
531 return 0;
532}
533EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
534
535static int irq_domain_translate(struct irq_domain *d,
536 struct irq_fwspec *fwspec,
537 irq_hw_number_t *hwirq, unsigned int *type)
538{
539#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
540 if (d->ops->translate)
541 return d->ops->translate(d, fwspec, hwirq, type);
542#endif
543 if (d->ops->xlate)
544 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
545 fwspec->param, fwspec->param_count,
546 hwirq, type);
547
548 /* If domain has no translation, then we assume interrupt line */
549 *hwirq = fwspec->param[0];
550 return 0;
551}
552
553static void of_phandle_args_to_fwspec(struct of_phandle_args *irq_data,
554 struct irq_fwspec *fwspec)
555{
556 int i;
557
558 fwspec->fwnode = irq_data->np ? &irq_data->np->fwnode : NULL;
559 fwspec->param_count = irq_data->args_count;
560
561 for (i = 0; i < irq_data->args_count; i++)
562 fwspec->param[i] = irq_data->args[i];
563}
564
565unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
566{
567 struct irq_domain *domain;
568 struct irq_data *irq_data;
569 irq_hw_number_t hwirq;
570 unsigned int type = IRQ_TYPE_NONE;
571 int virq;
572
573 if (fwspec->fwnode) {
574 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
575 if (!domain)
576 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
577 } else {
578 domain = irq_default_domain;
579 }
580
581 if (!domain) {
582 pr_warn("no irq domain found for %s !\n",
583 of_node_full_name(to_of_node(fwspec->fwnode)));
584 return 0;
585 }
586
587 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
588 return 0;
589
590 /*
591 * WARN if the irqchip returns a type with bits
592 * outside the sense mask set and clear these bits.
593 */
594 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
595 type &= IRQ_TYPE_SENSE_MASK;
596
597 /*
598 * If we've already configured this interrupt,
599 * don't do it again, or hell will break loose.
600 */
601 virq = irq_find_mapping(domain, hwirq);
602 if (virq) {
603 /*
604 * If the trigger type is not specified or matches the
605 * current trigger type then we are done so return the
606 * interrupt number.
607 */
608 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
609 return virq;
610
611 /*
612 * If the trigger type has not been set yet, then set
613 * it now and return the interrupt number.
614 */
615 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
616 irq_data = irq_get_irq_data(virq);
617 if (!irq_data)
618 return 0;
619
620 irqd_set_trigger_type(irq_data, type);
621 return virq;
622 }
623
624 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
625 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
626 return 0;
627 }
628
629 if (irq_domain_is_hierarchy(domain)) {
630 virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
631 if (virq <= 0)
632 return 0;
633 } else {
634 /* Create mapping */
635 virq = irq_create_mapping(domain, hwirq);
636 if (!virq)
637 return virq;
638 }
639
640 irq_data = irq_get_irq_data(virq);
641 if (!irq_data) {
642 if (irq_domain_is_hierarchy(domain))
643 irq_domain_free_irqs(virq, 1);
644 else
645 irq_dispose_mapping(virq);
646 return 0;
647 }
648
649 /* Store trigger type */
650 irqd_set_trigger_type(irq_data, type);
651
652 return virq;
653}
654EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
655
656unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
657{
658 struct irq_fwspec fwspec;
659
660 of_phandle_args_to_fwspec(irq_data, &fwspec);
661 return irq_create_fwspec_mapping(&fwspec);
662}
663EXPORT_SYMBOL_GPL(irq_create_of_mapping);
664
665/**
666 * irq_dispose_mapping() - Unmap an interrupt
667 * @virq: linux irq number of the interrupt to unmap
668 */
669void irq_dispose_mapping(unsigned int virq)
670{
671 struct irq_data *irq_data = irq_get_irq_data(virq);
672 struct irq_domain *domain;
673
674 if (!virq || !irq_data)
675 return;
676
677 domain = irq_data->domain;
678 if (WARN_ON(domain == NULL))
679 return;
680
681 if (irq_domain_is_hierarchy(domain)) {
682 irq_domain_free_irqs(virq, 1);
683 } else {
684 irq_domain_disassociate(domain, virq);
685 irq_free_desc(virq);
686 }
687}
688EXPORT_SYMBOL_GPL(irq_dispose_mapping);
689
690/**
691 * irq_find_mapping() - Find a linux irq from an hw irq number.
692 * @domain: domain owning this hardware interrupt
693 * @hwirq: hardware irq number in that domain space
694 */
695unsigned int irq_find_mapping(struct irq_domain *domain,
696 irq_hw_number_t hwirq)
697{
698 struct irq_data *data;
699
700 /* Look for default domain if nececssary */
701 if (domain == NULL)
702 domain = irq_default_domain;
703 if (domain == NULL)
704 return 0;
705
706 if (hwirq < domain->revmap_direct_max_irq) {
707 data = irq_domain_get_irq_data(domain, hwirq);
708 if (data && data->hwirq == hwirq)
709 return hwirq;
710 }
711
712 /* Check if the hwirq is in the linear revmap. */
713 if (hwirq < domain->revmap_size)
714 return domain->linear_revmap[hwirq];
715
716 rcu_read_lock();
717 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
718 rcu_read_unlock();
719 return data ? data->irq : 0;
720}
721EXPORT_SYMBOL_GPL(irq_find_mapping);
722
723#ifdef CONFIG_IRQ_DOMAIN_DEBUG
724static int virq_debug_show(struct seq_file *m, void *private)
725{
726 unsigned long flags;
727 struct irq_desc *desc;
728 struct irq_domain *domain;
729 struct radix_tree_iter iter;
730 void *data, **slot;
731 int i;
732
733 seq_printf(m, " %-16s %-6s %-10s %-10s %s\n",
734 "name", "mapped", "linear-max", "direct-max", "devtree-node");
735 mutex_lock(&irq_domain_mutex);
736 list_for_each_entry(domain, &irq_domain_list, link) {
737 struct device_node *of_node;
738 int count = 0;
739 of_node = irq_domain_get_of_node(domain);
740 radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0)
741 count++;
742 seq_printf(m, "%c%-16s %6u %10u %10u %s\n",
743 domain == irq_default_domain ? '*' : ' ', domain->name,
744 domain->revmap_size + count, domain->revmap_size,
745 domain->revmap_direct_max_irq,
746 of_node ? of_node_full_name(of_node) : "");
747 }
748 mutex_unlock(&irq_domain_mutex);
749
750 seq_printf(m, "%-5s %-7s %-15s %-*s %6s %-14s %s\n", "irq", "hwirq",
751 "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
752 "active", "type", "domain");
753
754 for (i = 1; i < nr_irqs; i++) {
755 desc = irq_to_desc(i);
756 if (!desc)
757 continue;
758
759 raw_spin_lock_irqsave(&desc->lock, flags);
760 domain = desc->irq_data.domain;
761
762 if (domain) {
763 struct irq_chip *chip;
764 int hwirq = desc->irq_data.hwirq;
765 bool direct;
766
767 seq_printf(m, "%5d ", i);
768 seq_printf(m, "0x%05x ", hwirq);
769
770 chip = irq_desc_get_chip(desc);
771 seq_printf(m, "%-15s ", (chip && chip->name) ? chip->name : "none");
772
773 data = irq_desc_get_chip_data(desc);
774 seq_printf(m, data ? "0x%p " : " %p ", data);
775
776 seq_printf(m, " %c ", (desc->action && desc->action->handler) ? '*' : ' ');
777 direct = (i == hwirq) && (i < domain->revmap_direct_max_irq);
778 seq_printf(m, "%6s%-8s ",
779 (hwirq < domain->revmap_size) ? "LINEAR" : "RADIX",
780 direct ? "(DIRECT)" : "");
781 seq_printf(m, "%s\n", desc->irq_data.domain->name);
782 }
783
784 raw_spin_unlock_irqrestore(&desc->lock, flags);
785 }
786
787 return 0;
788}
789
790static int virq_debug_open(struct inode *inode, struct file *file)
791{
792 return single_open(file, virq_debug_show, inode->i_private);
793}
794
795static const struct file_operations virq_debug_fops = {
796 .open = virq_debug_open,
797 .read = seq_read,
798 .llseek = seq_lseek,
799 .release = single_release,
800};
801
802static int __init irq_debugfs_init(void)
803{
804 if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
805 NULL, &virq_debug_fops) == NULL)
806 return -ENOMEM;
807
808 return 0;
809}
810__initcall(irq_debugfs_init);
811#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
812
813/**
814 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
815 *
816 * Device Tree IRQ specifier translation function which works with one cell
817 * bindings where the cell value maps directly to the hwirq number.
818 */
819int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
820 const u32 *intspec, unsigned int intsize,
821 unsigned long *out_hwirq, unsigned int *out_type)
822{
823 if (WARN_ON(intsize < 1))
824 return -EINVAL;
825 *out_hwirq = intspec[0];
826 *out_type = IRQ_TYPE_NONE;
827 return 0;
828}
829EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
830
831/**
832 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
833 *
834 * Device Tree IRQ specifier translation function which works with two cell
835 * bindings where the cell values map directly to the hwirq number
836 * and linux irq flags.
837 */
838int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
839 const u32 *intspec, unsigned int intsize,
840 irq_hw_number_t *out_hwirq, unsigned int *out_type)
841{
842 if (WARN_ON(intsize < 2))
843 return -EINVAL;
844 *out_hwirq = intspec[0];
845 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
846 return 0;
847}
848EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
849
850/**
851 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
852 *
853 * Device Tree IRQ specifier translation function which works with either one
854 * or two cell bindings where the cell values map directly to the hwirq number
855 * and linux irq flags.
856 *
857 * Note: don't use this function unless your interrupt controller explicitly
858 * supports both one and two cell bindings. For the majority of controllers
859 * the _onecell() or _twocell() variants above should be used.
860 */
861int irq_domain_xlate_onetwocell(struct irq_domain *d,
862 struct device_node *ctrlr,
863 const u32 *intspec, unsigned int intsize,
864 unsigned long *out_hwirq, unsigned int *out_type)
865{
866 if (WARN_ON(intsize < 1))
867 return -EINVAL;
868 *out_hwirq = intspec[0];
869 if (intsize > 1)
870 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
871 else
872 *out_type = IRQ_TYPE_NONE;
873 return 0;
874}
875EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
876
877const struct irq_domain_ops irq_domain_simple_ops = {
878 .xlate = irq_domain_xlate_onetwocell,
879};
880EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
881
882int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
883 int node, const struct cpumask *affinity)
884{
885 unsigned int hint;
886
887 if (virq >= 0) {
888 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
889 affinity);
890 } else {
891 hint = hwirq % nr_irqs;
892 if (hint == 0)
893 hint++;
894 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
895 affinity);
896 if (virq <= 0 && hint > 1) {
897 virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
898 affinity);
899 }
900 }
901
902 return virq;
903}
904
905#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
906/**
907 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
908 * @parent: Parent irq domain to associate with the new domain
909 * @flags: Irq domain flags associated to the domain
910 * @size: Size of the domain. See below
911 * @fwnode: Optional fwnode of the interrupt controller
912 * @ops: Pointer to the interrupt domain callbacks
913 * @host_data: Controller private data pointer
914 *
915 * If @size is 0 a tree domain is created, otherwise a linear domain.
916 *
917 * If successful the parent is associated to the new domain and the
918 * domain flags are set.
919 * Returns pointer to IRQ domain, or NULL on failure.
920 */
921struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
922 unsigned int flags,
923 unsigned int size,
924 struct fwnode_handle *fwnode,
925 const struct irq_domain_ops *ops,
926 void *host_data)
927{
928 struct irq_domain *domain;
929
930 if (size)
931 domain = irq_domain_create_linear(fwnode, size, ops, host_data);
932 else
933 domain = irq_domain_create_tree(fwnode, ops, host_data);
934 if (domain) {
935 domain->parent = parent;
936 domain->flags |= flags;
937 }
938
939 return domain;
940}
941EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
942
943static void irq_domain_insert_irq(int virq)
944{
945 struct irq_data *data;
946
947 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
948 struct irq_domain *domain = data->domain;
949 irq_hw_number_t hwirq = data->hwirq;
950
951 if (hwirq < domain->revmap_size) {
952 domain->linear_revmap[hwirq] = virq;
953 } else {
954 mutex_lock(&revmap_trees_mutex);
955 radix_tree_insert(&domain->revmap_tree, hwirq, data);
956 mutex_unlock(&revmap_trees_mutex);
957 }
958
959 /* If not already assigned, give the domain the chip's name */
960 if (!domain->name && data->chip)
961 domain->name = data->chip->name;
962 }
963
964 irq_clear_status_flags(virq, IRQ_NOREQUEST);
965}
966
967static void irq_domain_remove_irq(int virq)
968{
969 struct irq_data *data;
970
971 irq_set_status_flags(virq, IRQ_NOREQUEST);
972 irq_set_chip_and_handler(virq, NULL, NULL);
973 synchronize_irq(virq);
974 smp_mb();
975
976 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
977 struct irq_domain *domain = data->domain;
978 irq_hw_number_t hwirq = data->hwirq;
979
980 if (hwirq < domain->revmap_size) {
981 domain->linear_revmap[hwirq] = 0;
982 } else {
983 mutex_lock(&revmap_trees_mutex);
984 radix_tree_delete(&domain->revmap_tree, hwirq);
985 mutex_unlock(&revmap_trees_mutex);
986 }
987 }
988}
989
990static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
991 struct irq_data *child)
992{
993 struct irq_data *irq_data;
994
995 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
996 irq_data_get_node(child));
997 if (irq_data) {
998 child->parent_data = irq_data;
999 irq_data->irq = child->irq;
1000 irq_data->common = child->common;
1001 irq_data->domain = domain;
1002 }
1003
1004 return irq_data;
1005}
1006
1007static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1008{
1009 struct irq_data *irq_data, *tmp;
1010 int i;
1011
1012 for (i = 0; i < nr_irqs; i++) {
1013 irq_data = irq_get_irq_data(virq + i);
1014 tmp = irq_data->parent_data;
1015 irq_data->parent_data = NULL;
1016 irq_data->domain = NULL;
1017
1018 while (tmp) {
1019 irq_data = tmp;
1020 tmp = tmp->parent_data;
1021 kfree(irq_data);
1022 }
1023 }
1024}
1025
1026static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1027 unsigned int virq, unsigned int nr_irqs)
1028{
1029 struct irq_data *irq_data;
1030 struct irq_domain *parent;
1031 int i;
1032
1033 /* The outermost irq_data is embedded in struct irq_desc */
1034 for (i = 0; i < nr_irqs; i++) {
1035 irq_data = irq_get_irq_data(virq + i);
1036 irq_data->domain = domain;
1037
1038 for (parent = domain->parent; parent; parent = parent->parent) {
1039 irq_data = irq_domain_insert_irq_data(parent, irq_data);
1040 if (!irq_data) {
1041 irq_domain_free_irq_data(virq, i + 1);
1042 return -ENOMEM;
1043 }
1044 }
1045 }
1046
1047 return 0;
1048}
1049
1050/**
1051 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1052 * @domain: domain to match
1053 * @virq: IRQ number to get irq_data
1054 */
1055struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1056 unsigned int virq)
1057{
1058 struct irq_data *irq_data;
1059
1060 for (irq_data = irq_get_irq_data(virq); irq_data;
1061 irq_data = irq_data->parent_data)
1062 if (irq_data->domain == domain)
1063 return irq_data;
1064
1065 return NULL;
1066}
1067EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1068
1069/**
1070 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1071 * @domain: Interrupt domain to match
1072 * @virq: IRQ number
1073 * @hwirq: The hwirq number
1074 * @chip: The associated interrupt chip
1075 * @chip_data: The associated chip data
1076 */
1077int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1078 irq_hw_number_t hwirq, struct irq_chip *chip,
1079 void *chip_data)
1080{
1081 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1082
1083 if (!irq_data)
1084 return -ENOENT;
1085
1086 irq_data->hwirq = hwirq;
1087 irq_data->chip = chip ? chip : &no_irq_chip;
1088 irq_data->chip_data = chip_data;
1089
1090 return 0;
1091}
1092EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1093
1094/**
1095 * irq_domain_set_info - Set the complete data for a @virq in @domain
1096 * @domain: Interrupt domain to match
1097 * @virq: IRQ number
1098 * @hwirq: The hardware interrupt number
1099 * @chip: The associated interrupt chip
1100 * @chip_data: The associated interrupt chip data
1101 * @handler: The interrupt flow handler
1102 * @handler_data: The interrupt flow handler data
1103 * @handler_name: The interrupt handler name
1104 */
1105void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1106 irq_hw_number_t hwirq, struct irq_chip *chip,
1107 void *chip_data, irq_flow_handler_t handler,
1108 void *handler_data, const char *handler_name)
1109{
1110 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1111 __irq_set_handler(virq, handler, 0, handler_name);
1112 irq_set_handler_data(virq, handler_data);
1113}
1114EXPORT_SYMBOL(irq_domain_set_info);
1115
1116/**
1117 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1118 * @irq_data: The pointer to irq_data
1119 */
1120void irq_domain_reset_irq_data(struct irq_data *irq_data)
1121{
1122 irq_data->hwirq = 0;
1123 irq_data->chip = &no_irq_chip;
1124 irq_data->chip_data = NULL;
1125}
1126EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1127
1128/**
1129 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1130 * @domain: Interrupt domain to match
1131 * @virq: IRQ number to start with
1132 * @nr_irqs: The number of irqs to free
1133 */
1134void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1135 unsigned int nr_irqs)
1136{
1137 struct irq_data *irq_data;
1138 int i;
1139
1140 for (i = 0; i < nr_irqs; i++) {
1141 irq_data = irq_domain_get_irq_data(domain, virq + i);
1142 if (irq_data)
1143 irq_domain_reset_irq_data(irq_data);
1144 }
1145 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1146}
1147EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1148
1149/**
1150 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1151 * @domain: Interrupt domain to match
1152 * @virq: IRQ number to start with
1153 * @nr_irqs: The number of irqs to free
1154 */
1155void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1156 unsigned int nr_irqs)
1157{
1158 int i;
1159
1160 for (i = 0; i < nr_irqs; i++) {
1161 irq_set_handler_data(virq + i, NULL);
1162 irq_set_handler(virq + i, NULL);
1163 }
1164 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1165}
1166
1167static bool irq_domain_is_auto_recursive(struct irq_domain *domain)
1168{
1169 return domain->flags & IRQ_DOMAIN_FLAG_AUTO_RECURSIVE;
1170}
1171
1172static void irq_domain_free_irqs_recursive(struct irq_domain *domain,
1173 unsigned int irq_base,
1174 unsigned int nr_irqs)
1175{
1176 domain->ops->free(domain, irq_base, nr_irqs);
1177 if (irq_domain_is_auto_recursive(domain)) {
1178 BUG_ON(!domain->parent);
1179 irq_domain_free_irqs_recursive(domain->parent, irq_base,
1180 nr_irqs);
1181 }
1182}
1183
1184int irq_domain_alloc_irqs_recursive(struct irq_domain *domain,
1185 unsigned int irq_base,
1186 unsigned int nr_irqs, void *arg)
1187{
1188 int ret = 0;
1189 struct irq_domain *parent = domain->parent;
1190 bool recursive = irq_domain_is_auto_recursive(domain);
1191
1192 BUG_ON(recursive && !parent);
1193 if (recursive)
1194 ret = irq_domain_alloc_irqs_recursive(parent, irq_base,
1195 nr_irqs, arg);
1196 if (ret < 0)
1197 return ret;
1198
1199 ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1200 if (ret < 0 && recursive)
1201 irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs);
1202
1203 return ret;
1204}
1205
1206/**
1207 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1208 * @domain: domain to allocate from
1209 * @irq_base: allocate specified IRQ nubmer if irq_base >= 0
1210 * @nr_irqs: number of IRQs to allocate
1211 * @node: NUMA node id for memory allocation
1212 * @arg: domain specific argument
1213 * @realloc: IRQ descriptors have already been allocated if true
1214 * @affinity: Optional irq affinity mask for multiqueue devices
1215 *
1216 * Allocate IRQ numbers and initialized all data structures to support
1217 * hierarchy IRQ domains.
1218 * Parameter @realloc is mainly to support legacy IRQs.
1219 * Returns error code or allocated IRQ number
1220 *
1221 * The whole process to setup an IRQ has been split into two steps.
1222 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1223 * descriptor and required hardware resources. The second step,
1224 * irq_domain_activate_irq(), is to program hardwares with preallocated
1225 * resources. In this way, it's easier to rollback when failing to
1226 * allocate resources.
1227 */
1228int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1229 unsigned int nr_irqs, int node, void *arg,
1230 bool realloc, const struct cpumask *affinity)
1231{
1232 int i, ret, virq;
1233
1234 if (domain == NULL) {
1235 domain = irq_default_domain;
1236 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1237 return -EINVAL;
1238 }
1239
1240 if (!domain->ops->alloc) {
1241 pr_debug("domain->ops->alloc() is NULL\n");
1242 return -ENOSYS;
1243 }
1244
1245 if (realloc && irq_base >= 0) {
1246 virq = irq_base;
1247 } else {
1248 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1249 affinity);
1250 if (virq < 0) {
1251 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1252 irq_base, nr_irqs);
1253 return virq;
1254 }
1255 }
1256
1257 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1258 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1259 ret = -ENOMEM;
1260 goto out_free_desc;
1261 }
1262
1263 mutex_lock(&irq_domain_mutex);
1264 ret = irq_domain_alloc_irqs_recursive(domain, virq, nr_irqs, arg);
1265 if (ret < 0) {
1266 mutex_unlock(&irq_domain_mutex);
1267 goto out_free_irq_data;
1268 }
1269 for (i = 0; i < nr_irqs; i++)
1270 irq_domain_insert_irq(virq + i);
1271 mutex_unlock(&irq_domain_mutex);
1272
1273 return virq;
1274
1275out_free_irq_data:
1276 irq_domain_free_irq_data(virq, nr_irqs);
1277out_free_desc:
1278 irq_free_descs(virq, nr_irqs);
1279 return ret;
1280}
1281
1282/**
1283 * irq_domain_free_irqs - Free IRQ number and associated data structures
1284 * @virq: base IRQ number
1285 * @nr_irqs: number of IRQs to free
1286 */
1287void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1288{
1289 struct irq_data *data = irq_get_irq_data(virq);
1290 int i;
1291
1292 if (WARN(!data || !data->domain || !data->domain->ops->free,
1293 "NULL pointer, cannot free irq\n"))
1294 return;
1295
1296 mutex_lock(&irq_domain_mutex);
1297 for (i = 0; i < nr_irqs; i++)
1298 irq_domain_remove_irq(virq + i);
1299 irq_domain_free_irqs_recursive(data->domain, virq, nr_irqs);
1300 mutex_unlock(&irq_domain_mutex);
1301
1302 irq_domain_free_irq_data(virq, nr_irqs);
1303 irq_free_descs(virq, nr_irqs);
1304}
1305
1306/**
1307 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1308 * @irq_base: Base IRQ number
1309 * @nr_irqs: Number of IRQs to allocate
1310 * @arg: Allocation data (arch/domain specific)
1311 *
1312 * Check whether the domain has been setup recursive. If not allocate
1313 * through the parent domain.
1314 */
1315int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1316 unsigned int irq_base, unsigned int nr_irqs,
1317 void *arg)
1318{
1319 /* irq_domain_alloc_irqs_recursive() has called parent's alloc() */
1320 if (irq_domain_is_auto_recursive(domain))
1321 return 0;
1322
1323 domain = domain->parent;
1324 if (domain)
1325 return irq_domain_alloc_irqs_recursive(domain, irq_base,
1326 nr_irqs, arg);
1327 return -ENOSYS;
1328}
1329EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1330
1331/**
1332 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1333 * @irq_base: Base IRQ number
1334 * @nr_irqs: Number of IRQs to free
1335 *
1336 * Check whether the domain has been setup recursive. If not free
1337 * through the parent domain.
1338 */
1339void irq_domain_free_irqs_parent(struct irq_domain *domain,
1340 unsigned int irq_base, unsigned int nr_irqs)
1341{
1342 /* irq_domain_free_irqs_recursive() will call parent's free */
1343 if (!irq_domain_is_auto_recursive(domain) && domain->parent)
1344 irq_domain_free_irqs_recursive(domain->parent, irq_base,
1345 nr_irqs);
1346}
1347EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1348
1349static void __irq_domain_activate_irq(struct irq_data *irq_data)
1350{
1351 if (irq_data && irq_data->domain) {
1352 struct irq_domain *domain = irq_data->domain;
1353
1354 if (irq_data->parent_data)
1355 __irq_domain_activate_irq(irq_data->parent_data);
1356 if (domain->ops->activate)
1357 domain->ops->activate(domain, irq_data);
1358 }
1359}
1360
1361static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1362{
1363 if (irq_data && irq_data->domain) {
1364 struct irq_domain *domain = irq_data->domain;
1365
1366 if (domain->ops->deactivate)
1367 domain->ops->deactivate(domain, irq_data);
1368 if (irq_data->parent_data)
1369 __irq_domain_deactivate_irq(irq_data->parent_data);
1370 }
1371}
1372
1373/**
1374 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1375 * interrupt
1376 * @irq_data: outermost irq_data associated with interrupt
1377 *
1378 * This is the second step to call domain_ops->activate to program interrupt
1379 * controllers, so the interrupt could actually get delivered.
1380 */
1381void irq_domain_activate_irq(struct irq_data *irq_data)
1382{
1383 if (!irqd_is_activated(irq_data)) {
1384 __irq_domain_activate_irq(irq_data);
1385 irqd_set_activated(irq_data);
1386 }
1387}
1388
1389/**
1390 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1391 * deactivate interrupt
1392 * @irq_data: outermost irq_data associated with interrupt
1393 *
1394 * It calls domain_ops->deactivate to program interrupt controllers to disable
1395 * interrupt delivery.
1396 */
1397void irq_domain_deactivate_irq(struct irq_data *irq_data)
1398{
1399 if (irqd_is_activated(irq_data)) {
1400 __irq_domain_deactivate_irq(irq_data);
1401 irqd_clr_activated(irq_data);
1402 }
1403}
1404
1405static void irq_domain_check_hierarchy(struct irq_domain *domain)
1406{
1407 /* Hierarchy irq_domains must implement callback alloc() */
1408 if (domain->ops->alloc)
1409 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1410}
1411#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1412/**
1413 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1414 * @domain: domain to match
1415 * @virq: IRQ number to get irq_data
1416 */
1417struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1418 unsigned int virq)
1419{
1420 struct irq_data *irq_data = irq_get_irq_data(virq);
1421
1422 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1423}
1424EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1425
1426/**
1427 * irq_domain_set_info - Set the complete data for a @virq in @domain
1428 * @domain: Interrupt domain to match
1429 * @virq: IRQ number
1430 * @hwirq: The hardware interrupt number
1431 * @chip: The associated interrupt chip
1432 * @chip_data: The associated interrupt chip data
1433 * @handler: The interrupt flow handler
1434 * @handler_data: The interrupt flow handler data
1435 * @handler_name: The interrupt handler name
1436 */
1437void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1438 irq_hw_number_t hwirq, struct irq_chip *chip,
1439 void *chip_data, irq_flow_handler_t handler,
1440 void *handler_data, const char *handler_name)
1441{
1442 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1443 irq_set_chip_data(virq, chip_data);
1444 irq_set_handler_data(virq, handler_data);
1445}
1446
1447static void irq_domain_check_hierarchy(struct irq_domain *domain)
1448{
1449}
1450#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
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, "%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}
110EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
111
112/**
113 * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
114 *
115 * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
116 */
117void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
118{
119 struct irqchip_fwid *fwid;
120
121 if (!fwnode || WARN_ON(!is_fwnode_irqchip(fwnode)))
122 return;
123
124 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
125 kfree(fwid->name);
126 kfree(fwid);
127}
128EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
129
130static struct irq_domain *__irq_domain_create(struct fwnode_handle *fwnode,
131 unsigned int size,
132 irq_hw_number_t hwirq_max,
133 int direct_max,
134 const struct irq_domain_ops *ops,
135 void *host_data)
136{
137 struct irqchip_fwid *fwid;
138 struct irq_domain *domain;
139
140 static atomic_t unknown_domains;
141
142 if (WARN_ON((size && direct_max) ||
143 (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max) ||
144 (direct_max && (direct_max != hwirq_max))))
145 return NULL;
146
147 domain = kzalloc_node(struct_size(domain, revmap, size),
148 GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
149 if (!domain)
150 return NULL;
151
152 if (is_fwnode_irqchip(fwnode)) {
153 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
154
155 switch (fwid->type) {
156 case IRQCHIP_FWNODE_NAMED:
157 case IRQCHIP_FWNODE_NAMED_ID:
158 domain->fwnode = fwnode;
159 domain->name = kstrdup(fwid->name, GFP_KERNEL);
160 if (!domain->name) {
161 kfree(domain);
162 return NULL;
163 }
164 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
165 break;
166 default:
167 domain->fwnode = fwnode;
168 domain->name = fwid->name;
169 break;
170 }
171 } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
172 is_software_node(fwnode)) {
173 char *name;
174
175 /*
176 * fwnode paths contain '/', which debugfs is legitimately
177 * unhappy about. Replace them with ':', which does
178 * the trick and is not as offensive as '\'...
179 */
180 name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
181 if (!name) {
182 kfree(domain);
183 return NULL;
184 }
185
186 domain->name = strreplace(name, '/', ':');
187 domain->fwnode = fwnode;
188 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
189 }
190
191 if (!domain->name) {
192 if (fwnode)
193 pr_err("Invalid fwnode type for irqdomain\n");
194 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
195 atomic_inc_return(&unknown_domains));
196 if (!domain->name) {
197 kfree(domain);
198 return NULL;
199 }
200 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
201 }
202
203 fwnode_handle_get(fwnode);
204 fwnode_dev_initialized(fwnode, true);
205
206 /* Fill structure */
207 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
208 domain->ops = ops;
209 domain->host_data = host_data;
210 domain->hwirq_max = hwirq_max;
211
212 if (direct_max)
213 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
214
215 domain->revmap_size = size;
216
217 /*
218 * Hierarchical domains use the domain lock of the root domain
219 * (innermost domain).
220 *
221 * For non-hierarchical domains (as for root domains), the root
222 * pointer is set to the domain itself so that &domain->root->mutex
223 * always points to the right lock.
224 */
225 mutex_init(&domain->mutex);
226 domain->root = domain;
227
228 irq_domain_check_hierarchy(domain);
229
230 return domain;
231}
232
233static void __irq_domain_publish(struct irq_domain *domain)
234{
235 mutex_lock(&irq_domain_mutex);
236 debugfs_add_domain_dir(domain);
237 list_add(&domain->link, &irq_domain_list);
238 mutex_unlock(&irq_domain_mutex);
239
240 pr_debug("Added domain %s\n", domain->name);
241}
242
243/**
244 * __irq_domain_add() - Allocate a new irq_domain data structure
245 * @fwnode: firmware node for the interrupt controller
246 * @size: Size of linear map; 0 for radix mapping only
247 * @hwirq_max: Maximum number of interrupts supported by controller
248 * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
249 * direct mapping
250 * @ops: domain callbacks
251 * @host_data: Controller private data pointer
252 *
253 * Allocates and initializes an irq_domain structure.
254 * Returns pointer to IRQ domain, or NULL on failure.
255 */
256struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
257 irq_hw_number_t hwirq_max, int direct_max,
258 const struct irq_domain_ops *ops,
259 void *host_data)
260{
261 struct irq_domain *domain;
262
263 domain = __irq_domain_create(fwnode, size, hwirq_max, direct_max,
264 ops, host_data);
265 if (domain)
266 __irq_domain_publish(domain);
267
268 return domain;
269}
270EXPORT_SYMBOL_GPL(__irq_domain_add);
271
272/**
273 * irq_domain_remove() - Remove an irq domain.
274 * @domain: domain to remove
275 *
276 * This routine is used to remove an irq domain. The caller must ensure
277 * that all mappings within the domain have been disposed of prior to
278 * use, depending on the revmap type.
279 */
280void irq_domain_remove(struct irq_domain *domain)
281{
282 mutex_lock(&irq_domain_mutex);
283 debugfs_remove_domain_dir(domain);
284
285 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
286
287 list_del(&domain->link);
288
289 /*
290 * If the going away domain is the default one, reset it.
291 */
292 if (unlikely(irq_default_domain == domain))
293 irq_set_default_host(NULL);
294
295 mutex_unlock(&irq_domain_mutex);
296
297 pr_debug("Removed domain %s\n", domain->name);
298
299 fwnode_dev_initialized(domain->fwnode, false);
300 fwnode_handle_put(domain->fwnode);
301 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
302 kfree(domain->name);
303 kfree(domain);
304}
305EXPORT_SYMBOL_GPL(irq_domain_remove);
306
307void irq_domain_update_bus_token(struct irq_domain *domain,
308 enum irq_domain_bus_token bus_token)
309{
310 char *name;
311
312 if (domain->bus_token == bus_token)
313 return;
314
315 mutex_lock(&irq_domain_mutex);
316
317 domain->bus_token = bus_token;
318
319 name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
320 if (!name) {
321 mutex_unlock(&irq_domain_mutex);
322 return;
323 }
324
325 debugfs_remove_domain_dir(domain);
326
327 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
328 kfree(domain->name);
329 else
330 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
331
332 domain->name = name;
333 debugfs_add_domain_dir(domain);
334
335 mutex_unlock(&irq_domain_mutex);
336}
337EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
338
339/**
340 * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
341 * @fwnode: firmware node for the interrupt controller
342 * @size: total number of irqs in mapping
343 * @first_irq: first number of irq block assigned to the domain,
344 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
345 * pre-map all of the irqs in the domain to virqs starting at first_irq.
346 * @ops: domain callbacks
347 * @host_data: Controller private data pointer
348 *
349 * Allocates an irq_domain, and optionally if first_irq is positive then also
350 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
351 *
352 * This is intended to implement the expected behaviour for most
353 * interrupt controllers. If device tree is used, then first_irq will be 0 and
354 * irqs get mapped dynamically on the fly. However, if the controller requires
355 * static virq assignments (non-DT boot) then it will set that up correctly.
356 */
357struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
358 unsigned int size,
359 unsigned int first_irq,
360 const struct irq_domain_ops *ops,
361 void *host_data)
362{
363 struct irq_domain *domain;
364
365 domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data);
366 if (!domain)
367 return NULL;
368
369 if (first_irq > 0) {
370 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
371 /* attempt to allocated irq_descs */
372 int rc = irq_alloc_descs(first_irq, first_irq, size,
373 of_node_to_nid(to_of_node(fwnode)));
374 if (rc < 0)
375 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
376 first_irq);
377 }
378 irq_domain_associate_many(domain, first_irq, 0, size);
379 }
380
381 return domain;
382}
383EXPORT_SYMBOL_GPL(irq_domain_create_simple);
384
385/**
386 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
387 * @of_node: pointer to interrupt controller's device tree node.
388 * @size: total number of irqs in legacy mapping
389 * @first_irq: first number of irq block assigned to the domain
390 * @first_hwirq: first hwirq number to use for the translation. Should normally
391 * be '0', but a positive integer can be used if the effective
392 * hwirqs numbering does not begin at zero.
393 * @ops: map/unmap domain callbacks
394 * @host_data: Controller private data pointer
395 *
396 * Note: the map() callback will be called before this function returns
397 * for all legacy interrupts except 0 (which is always the invalid irq for
398 * a legacy controller).
399 */
400struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
401 unsigned int size,
402 unsigned int first_irq,
403 irq_hw_number_t first_hwirq,
404 const struct irq_domain_ops *ops,
405 void *host_data)
406{
407 return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
408 first_irq, first_hwirq, ops, host_data);
409}
410EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
411
412struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
413 unsigned int size,
414 unsigned int first_irq,
415 irq_hw_number_t first_hwirq,
416 const struct irq_domain_ops *ops,
417 void *host_data)
418{
419 struct irq_domain *domain;
420
421 domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
422 if (domain)
423 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
424
425 return domain;
426}
427EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
428
429/**
430 * irq_find_matching_fwspec() - Locates a domain for a given fwspec
431 * @fwspec: FW specifier for an interrupt
432 * @bus_token: domain-specific data
433 */
434struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
435 enum irq_domain_bus_token bus_token)
436{
437 struct irq_domain *h, *found = NULL;
438 struct fwnode_handle *fwnode = fwspec->fwnode;
439 int rc;
440
441 /* We might want to match the legacy controller last since
442 * it might potentially be set to match all interrupts in
443 * the absence of a device node. This isn't a problem so far
444 * yet though...
445 *
446 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
447 * values must generate an exact match for the domain to be
448 * selected.
449 */
450 mutex_lock(&irq_domain_mutex);
451 list_for_each_entry(h, &irq_domain_list, link) {
452 if (h->ops->select && bus_token != DOMAIN_BUS_ANY)
453 rc = h->ops->select(h, fwspec, bus_token);
454 else if (h->ops->match)
455 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
456 else
457 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
458 ((bus_token == DOMAIN_BUS_ANY) ||
459 (h->bus_token == bus_token)));
460
461 if (rc) {
462 found = h;
463 break;
464 }
465 }
466 mutex_unlock(&irq_domain_mutex);
467 return found;
468}
469EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
470
471/**
472 * irq_set_default_host() - Set a "default" irq domain
473 * @domain: default domain pointer
474 *
475 * For convenience, it's possible to set a "default" domain that will be used
476 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
477 * platforms that want to manipulate a few hard coded interrupt numbers that
478 * aren't properly represented in the device-tree.
479 */
480void irq_set_default_host(struct irq_domain *domain)
481{
482 pr_debug("Default domain set to @0x%p\n", domain);
483
484 irq_default_domain = domain;
485}
486EXPORT_SYMBOL_GPL(irq_set_default_host);
487
488/**
489 * irq_get_default_host() - Retrieve the "default" irq domain
490 *
491 * Returns: the default domain, if any.
492 *
493 * Modern code should never use this. This should only be used on
494 * systems that cannot implement a firmware->fwnode mapping (which
495 * both DT and ACPI provide).
496 */
497struct irq_domain *irq_get_default_host(void)
498{
499 return irq_default_domain;
500}
501EXPORT_SYMBOL_GPL(irq_get_default_host);
502
503static bool irq_domain_is_nomap(struct irq_domain *domain)
504{
505 return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
506 (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
507}
508
509static void irq_domain_clear_mapping(struct irq_domain *domain,
510 irq_hw_number_t hwirq)
511{
512 lockdep_assert_held(&domain->root->mutex);
513
514 if (irq_domain_is_nomap(domain))
515 return;
516
517 if (hwirq < domain->revmap_size)
518 rcu_assign_pointer(domain->revmap[hwirq], NULL);
519 else
520 radix_tree_delete(&domain->revmap_tree, hwirq);
521}
522
523static void irq_domain_set_mapping(struct irq_domain *domain,
524 irq_hw_number_t hwirq,
525 struct irq_data *irq_data)
526{
527 /*
528 * This also makes sure that all domains point to the same root when
529 * called from irq_domain_insert_irq() for each domain in a hierarchy.
530 */
531 lockdep_assert_held(&domain->root->mutex);
532
533 if (irq_domain_is_nomap(domain))
534 return;
535
536 if (hwirq < domain->revmap_size)
537 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
538 else
539 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
540}
541
542static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
543{
544 struct irq_data *irq_data = irq_get_irq_data(irq);
545 irq_hw_number_t hwirq;
546
547 if (WARN(!irq_data || irq_data->domain != domain,
548 "virq%i doesn't exist; cannot disassociate\n", irq))
549 return;
550
551 hwirq = irq_data->hwirq;
552
553 mutex_lock(&domain->root->mutex);
554
555 irq_set_status_flags(irq, IRQ_NOREQUEST);
556
557 /* remove chip and handler */
558 irq_set_chip_and_handler(irq, NULL, NULL);
559
560 /* Make sure it's completed */
561 synchronize_irq(irq);
562
563 /* Tell the PIC about it */
564 if (domain->ops->unmap)
565 domain->ops->unmap(domain, irq);
566 smp_mb();
567
568 irq_data->domain = NULL;
569 irq_data->hwirq = 0;
570 domain->mapcount--;
571
572 /* Clear reverse map for this hwirq */
573 irq_domain_clear_mapping(domain, hwirq);
574
575 mutex_unlock(&domain->root->mutex);
576}
577
578static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
579 irq_hw_number_t hwirq)
580{
581 struct irq_data *irq_data = irq_get_irq_data(virq);
582 int ret;
583
584 if (WARN(hwirq >= domain->hwirq_max,
585 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
586 return -EINVAL;
587 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
588 return -EINVAL;
589 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
590 return -EINVAL;
591
592 irq_data->hwirq = hwirq;
593 irq_data->domain = domain;
594 if (domain->ops->map) {
595 ret = domain->ops->map(domain, virq, hwirq);
596 if (ret != 0) {
597 /*
598 * If map() returns -EPERM, this interrupt is protected
599 * by the firmware or some other service and shall not
600 * be mapped. Don't bother telling the user about it.
601 */
602 if (ret != -EPERM) {
603 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
604 domain->name, hwirq, virq, ret);
605 }
606 irq_data->domain = NULL;
607 irq_data->hwirq = 0;
608 return ret;
609 }
610 }
611
612 domain->mapcount++;
613 irq_domain_set_mapping(domain, hwirq, irq_data);
614
615 irq_clear_status_flags(virq, IRQ_NOREQUEST);
616
617 return 0;
618}
619
620int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
621 irq_hw_number_t hwirq)
622{
623 int ret;
624
625 mutex_lock(&domain->root->mutex);
626 ret = irq_domain_associate_locked(domain, virq, hwirq);
627 mutex_unlock(&domain->root->mutex);
628
629 return ret;
630}
631EXPORT_SYMBOL_GPL(irq_domain_associate);
632
633void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
634 irq_hw_number_t hwirq_base, int count)
635{
636 struct device_node *of_node;
637 int i;
638
639 of_node = irq_domain_get_of_node(domain);
640 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
641 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
642
643 for (i = 0; i < count; i++)
644 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
645}
646EXPORT_SYMBOL_GPL(irq_domain_associate_many);
647
648#ifdef CONFIG_IRQ_DOMAIN_NOMAP
649/**
650 * irq_create_direct_mapping() - Allocate an irq for direct mapping
651 * @domain: domain to allocate the irq for or NULL for default domain
652 *
653 * This routine is used for irq controllers which can choose the hardware
654 * interrupt numbers they generate. In such a case it's simplest to use
655 * the linux irq as the hardware interrupt number. It still uses the linear
656 * or radix tree to store the mapping, but the irq controller can optimize
657 * the revmap path by using the hwirq directly.
658 */
659unsigned int irq_create_direct_mapping(struct irq_domain *domain)
660{
661 struct device_node *of_node;
662 unsigned int virq;
663
664 if (domain == NULL)
665 domain = irq_default_domain;
666
667 of_node = irq_domain_get_of_node(domain);
668 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
669 if (!virq) {
670 pr_debug("create_direct virq allocation failed\n");
671 return 0;
672 }
673 if (virq >= domain->hwirq_max) {
674 pr_err("ERROR: no free irqs available below %lu maximum\n",
675 domain->hwirq_max);
676 irq_free_desc(virq);
677 return 0;
678 }
679 pr_debug("create_direct obtained virq %d\n", virq);
680
681 if (irq_domain_associate(domain, virq, virq)) {
682 irq_free_desc(virq);
683 return 0;
684 }
685
686 return virq;
687}
688EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
689#endif
690
691static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
692 irq_hw_number_t hwirq,
693 const struct irq_affinity_desc *affinity)
694{
695 struct device_node *of_node = irq_domain_get_of_node(domain);
696 int virq;
697
698 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
699
700 /* Allocate a virtual interrupt number */
701 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
702 affinity);
703 if (virq <= 0) {
704 pr_debug("-> virq allocation failed\n");
705 return 0;
706 }
707
708 if (irq_domain_associate_locked(domain, virq, hwirq)) {
709 irq_free_desc(virq);
710 return 0;
711 }
712
713 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
714 hwirq, of_node_full_name(of_node), virq);
715
716 return virq;
717}
718
719/**
720 * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
721 * @domain: domain owning this hardware interrupt or NULL for default domain
722 * @hwirq: hardware irq number in that domain space
723 * @affinity: irq affinity
724 *
725 * Only one mapping per hardware interrupt is permitted. Returns a linux
726 * irq number.
727 * If the sense/trigger is to be specified, set_irq_type() should be called
728 * on the number returned from that call.
729 */
730unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
731 irq_hw_number_t hwirq,
732 const struct irq_affinity_desc *affinity)
733{
734 int virq;
735
736 /* Look for default domain if necessary */
737 if (domain == NULL)
738 domain = irq_default_domain;
739 if (domain == NULL) {
740 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
741 return 0;
742 }
743
744 mutex_lock(&domain->root->mutex);
745
746 /* Check if mapping already exists */
747 virq = irq_find_mapping(domain, hwirq);
748 if (virq) {
749 pr_debug("existing mapping on virq %d\n", virq);
750 goto out;
751 }
752
753 virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
754out:
755 mutex_unlock(&domain->root->mutex);
756
757 return virq;
758}
759EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
760
761static int irq_domain_translate(struct irq_domain *d,
762 struct irq_fwspec *fwspec,
763 irq_hw_number_t *hwirq, unsigned int *type)
764{
765#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
766 if (d->ops->translate)
767 return d->ops->translate(d, fwspec, hwirq, type);
768#endif
769 if (d->ops->xlate)
770 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
771 fwspec->param, fwspec->param_count,
772 hwirq, type);
773
774 /* If domain has no translation, then we assume interrupt line */
775 *hwirq = fwspec->param[0];
776 return 0;
777}
778
779void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
780 unsigned int count, struct irq_fwspec *fwspec)
781{
782 int i;
783
784 fwspec->fwnode = of_node_to_fwnode(np);
785 fwspec->param_count = count;
786
787 for (i = 0; i < count; i++)
788 fwspec->param[i] = args[i];
789}
790EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
791
792unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
793{
794 struct irq_domain *domain;
795 struct irq_data *irq_data;
796 irq_hw_number_t hwirq;
797 unsigned int type = IRQ_TYPE_NONE;
798 int virq;
799
800 if (fwspec->fwnode) {
801 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
802 if (!domain)
803 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
804 } else {
805 domain = irq_default_domain;
806 }
807
808 if (!domain) {
809 pr_warn("no irq domain found for %s !\n",
810 of_node_full_name(to_of_node(fwspec->fwnode)));
811 return 0;
812 }
813
814 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
815 return 0;
816
817 /*
818 * WARN if the irqchip returns a type with bits
819 * outside the sense mask set and clear these bits.
820 */
821 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
822 type &= IRQ_TYPE_SENSE_MASK;
823
824 mutex_lock(&domain->root->mutex);
825
826 /*
827 * If we've already configured this interrupt,
828 * don't do it again, or hell will break loose.
829 */
830 virq = irq_find_mapping(domain, hwirq);
831 if (virq) {
832 /*
833 * If the trigger type is not specified or matches the
834 * current trigger type then we are done so return the
835 * interrupt number.
836 */
837 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
838 goto out;
839
840 /*
841 * If the trigger type has not been set yet, then set
842 * it now and return the interrupt number.
843 */
844 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
845 irq_data = irq_get_irq_data(virq);
846 if (!irq_data) {
847 virq = 0;
848 goto out;
849 }
850
851 irqd_set_trigger_type(irq_data, type);
852 goto out;
853 }
854
855 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
856 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
857 virq = 0;
858 goto out;
859 }
860
861 if (irq_domain_is_hierarchy(domain)) {
862 if (irq_domain_is_msi_device(domain)) {
863 mutex_unlock(&domain->root->mutex);
864 virq = msi_device_domain_alloc_wired(domain, hwirq, type);
865 mutex_lock(&domain->root->mutex);
866 } else
867 virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
868 fwspec, false, NULL);
869 if (virq <= 0) {
870 virq = 0;
871 goto out;
872 }
873 } else {
874 /* Create mapping */
875 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
876 if (!virq)
877 goto out;
878 }
879
880 irq_data = irq_get_irq_data(virq);
881 if (WARN_ON(!irq_data)) {
882 virq = 0;
883 goto out;
884 }
885
886 /* Store trigger type */
887 irqd_set_trigger_type(irq_data, type);
888out:
889 mutex_unlock(&domain->root->mutex);
890
891 return virq;
892}
893EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
894
895unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
896{
897 struct irq_fwspec fwspec;
898
899 of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
900 irq_data->args_count, &fwspec);
901
902 return irq_create_fwspec_mapping(&fwspec);
903}
904EXPORT_SYMBOL_GPL(irq_create_of_mapping);
905
906/**
907 * irq_dispose_mapping() - Unmap an interrupt
908 * @virq: linux irq number of the interrupt to unmap
909 */
910void irq_dispose_mapping(unsigned int virq)
911{
912 struct irq_data *irq_data = irq_get_irq_data(virq);
913 struct irq_domain *domain;
914
915 if (!virq || !irq_data)
916 return;
917
918 domain = irq_data->domain;
919 if (WARN_ON(domain == NULL))
920 return;
921
922 if (irq_domain_is_hierarchy(domain)) {
923 irq_domain_free_one_irq(domain, virq);
924 } else {
925 irq_domain_disassociate(domain, virq);
926 irq_free_desc(virq);
927 }
928}
929EXPORT_SYMBOL_GPL(irq_dispose_mapping);
930
931/**
932 * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
933 * @domain: domain owning this hardware interrupt
934 * @hwirq: hardware irq number in that domain space
935 * @irq: optional pointer to return the Linux irq if required
936 *
937 * Returns the interrupt descriptor.
938 */
939struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
940 irq_hw_number_t hwirq,
941 unsigned int *irq)
942{
943 struct irq_desc *desc = NULL;
944 struct irq_data *data;
945
946 /* Look for default domain if necessary */
947 if (domain == NULL)
948 domain = irq_default_domain;
949 if (domain == NULL)
950 return desc;
951
952 if (irq_domain_is_nomap(domain)) {
953 if (hwirq < domain->hwirq_max) {
954 data = irq_domain_get_irq_data(domain, hwirq);
955 if (data && data->hwirq == hwirq)
956 desc = irq_data_to_desc(data);
957 if (irq && desc)
958 *irq = hwirq;
959 }
960
961 return desc;
962 }
963
964 rcu_read_lock();
965 /* Check if the hwirq is in the linear revmap. */
966 if (hwirq < domain->revmap_size)
967 data = rcu_dereference(domain->revmap[hwirq]);
968 else
969 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
970
971 if (likely(data)) {
972 desc = irq_data_to_desc(data);
973 if (irq)
974 *irq = data->irq;
975 }
976
977 rcu_read_unlock();
978 return desc;
979}
980EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
981
982/**
983 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
984 *
985 * Device Tree IRQ specifier translation function which works with one cell
986 * bindings where the cell value maps directly to the hwirq number.
987 */
988int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
989 const u32 *intspec, unsigned int intsize,
990 unsigned long *out_hwirq, unsigned int *out_type)
991{
992 if (WARN_ON(intsize < 1))
993 return -EINVAL;
994 *out_hwirq = intspec[0];
995 *out_type = IRQ_TYPE_NONE;
996 return 0;
997}
998EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
999
1000/**
1001 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1002 *
1003 * Device Tree IRQ specifier translation function which works with two cell
1004 * bindings where the cell values map directly to the hwirq number
1005 * and linux irq flags.
1006 */
1007int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1008 const u32 *intspec, unsigned int intsize,
1009 irq_hw_number_t *out_hwirq, unsigned int *out_type)
1010{
1011 struct irq_fwspec fwspec;
1012
1013 of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1014 return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1015}
1016EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1017
1018/**
1019 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1020 *
1021 * Device Tree IRQ specifier translation function which works with either one
1022 * or two cell bindings where the cell values map directly to the hwirq number
1023 * and linux irq flags.
1024 *
1025 * Note: don't use this function unless your interrupt controller explicitly
1026 * supports both one and two cell bindings. For the majority of controllers
1027 * the _onecell() or _twocell() variants above should be used.
1028 */
1029int irq_domain_xlate_onetwocell(struct irq_domain *d,
1030 struct device_node *ctrlr,
1031 const u32 *intspec, unsigned int intsize,
1032 unsigned long *out_hwirq, unsigned int *out_type)
1033{
1034 if (WARN_ON(intsize < 1))
1035 return -EINVAL;
1036 *out_hwirq = intspec[0];
1037 if (intsize > 1)
1038 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1039 else
1040 *out_type = IRQ_TYPE_NONE;
1041 return 0;
1042}
1043EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1044
1045const struct irq_domain_ops irq_domain_simple_ops = {
1046 .xlate = irq_domain_xlate_onetwocell,
1047};
1048EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1049
1050/**
1051 * irq_domain_translate_onecell() - Generic translate for direct one cell
1052 * bindings
1053 */
1054int irq_domain_translate_onecell(struct irq_domain *d,
1055 struct irq_fwspec *fwspec,
1056 unsigned long *out_hwirq,
1057 unsigned int *out_type)
1058{
1059 if (WARN_ON(fwspec->param_count < 1))
1060 return -EINVAL;
1061 *out_hwirq = fwspec->param[0];
1062 *out_type = IRQ_TYPE_NONE;
1063 return 0;
1064}
1065EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1066
1067/**
1068 * irq_domain_translate_twocell() - Generic translate for direct two cell
1069 * bindings
1070 *
1071 * Device Tree IRQ specifier translation function which works with two cell
1072 * bindings where the cell values map directly to the hwirq number
1073 * and linux irq flags.
1074 */
1075int irq_domain_translate_twocell(struct irq_domain *d,
1076 struct irq_fwspec *fwspec,
1077 unsigned long *out_hwirq,
1078 unsigned int *out_type)
1079{
1080 if (WARN_ON(fwspec->param_count < 2))
1081 return -EINVAL;
1082 *out_hwirq = fwspec->param[0];
1083 *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1084 return 0;
1085}
1086EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1087
1088int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1089 int node, const struct irq_affinity_desc *affinity)
1090{
1091 unsigned int hint;
1092
1093 if (virq >= 0) {
1094 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1095 affinity);
1096 } else {
1097 hint = hwirq % nr_irqs;
1098 if (hint == 0)
1099 hint++;
1100 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1101 affinity);
1102 if (virq <= 0 && hint > 1) {
1103 virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1104 affinity);
1105 }
1106 }
1107
1108 return virq;
1109}
1110
1111/**
1112 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1113 * @irq_data: The pointer to irq_data
1114 */
1115void irq_domain_reset_irq_data(struct irq_data *irq_data)
1116{
1117 irq_data->hwirq = 0;
1118 irq_data->chip = &no_irq_chip;
1119 irq_data->chip_data = NULL;
1120}
1121EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1122
1123#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1124/**
1125 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1126 * @parent: Parent irq domain to associate with the new domain
1127 * @flags: Irq domain flags associated to the domain
1128 * @size: Size of the domain. See below
1129 * @fwnode: Optional fwnode of the interrupt controller
1130 * @ops: Pointer to the interrupt domain callbacks
1131 * @host_data: Controller private data pointer
1132 *
1133 * If @size is 0 a tree domain is created, otherwise a linear domain.
1134 *
1135 * If successful the parent is associated to the new domain and the
1136 * domain flags are set.
1137 * Returns pointer to IRQ domain, or NULL on failure.
1138 */
1139struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1140 unsigned int flags,
1141 unsigned int size,
1142 struct fwnode_handle *fwnode,
1143 const struct irq_domain_ops *ops,
1144 void *host_data)
1145{
1146 struct irq_domain *domain;
1147
1148 if (size)
1149 domain = __irq_domain_create(fwnode, size, size, 0, ops, host_data);
1150 else
1151 domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
1152
1153 if (domain) {
1154 if (parent)
1155 domain->root = parent->root;
1156 domain->parent = parent;
1157 domain->flags |= flags;
1158
1159 __irq_domain_publish(domain);
1160 }
1161
1162 return domain;
1163}
1164EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1165
1166static void irq_domain_insert_irq(int virq)
1167{
1168 struct irq_data *data;
1169
1170 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1171 struct irq_domain *domain = data->domain;
1172
1173 domain->mapcount++;
1174 irq_domain_set_mapping(domain, data->hwirq, data);
1175 }
1176
1177 irq_clear_status_flags(virq, IRQ_NOREQUEST);
1178}
1179
1180static void irq_domain_remove_irq(int virq)
1181{
1182 struct irq_data *data;
1183
1184 irq_set_status_flags(virq, IRQ_NOREQUEST);
1185 irq_set_chip_and_handler(virq, NULL, NULL);
1186 synchronize_irq(virq);
1187 smp_mb();
1188
1189 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1190 struct irq_domain *domain = data->domain;
1191 irq_hw_number_t hwirq = data->hwirq;
1192
1193 domain->mapcount--;
1194 irq_domain_clear_mapping(domain, hwirq);
1195 }
1196}
1197
1198static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1199 struct irq_data *child)
1200{
1201 struct irq_data *irq_data;
1202
1203 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1204 irq_data_get_node(child));
1205 if (irq_data) {
1206 child->parent_data = irq_data;
1207 irq_data->irq = child->irq;
1208 irq_data->common = child->common;
1209 irq_data->domain = domain;
1210 }
1211
1212 return irq_data;
1213}
1214
1215static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1216{
1217 struct irq_data *tmp;
1218
1219 while (irq_data) {
1220 tmp = irq_data;
1221 irq_data = irq_data->parent_data;
1222 kfree(tmp);
1223 }
1224}
1225
1226static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1227{
1228 struct irq_data *irq_data, *tmp;
1229 int i;
1230
1231 for (i = 0; i < nr_irqs; i++) {
1232 irq_data = irq_get_irq_data(virq + i);
1233 tmp = irq_data->parent_data;
1234 irq_data->parent_data = NULL;
1235 irq_data->domain = NULL;
1236
1237 __irq_domain_free_hierarchy(tmp);
1238 }
1239}
1240
1241/**
1242 * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1243 * @domain: IRQ domain from which the hierarchy is to be disconnected
1244 * @virq: IRQ number where the hierarchy is to be trimmed
1245 *
1246 * Marks the @virq level belonging to @domain as disconnected.
1247 * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1248 * to @domain.
1249 *
1250 * Its only use is to be able to trim levels of hierarchy that do not
1251 * have any real meaning for this interrupt, and that the driver marks
1252 * as such from its .alloc() callback.
1253 */
1254int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1255 unsigned int virq)
1256{
1257 struct irq_data *irqd;
1258
1259 irqd = irq_domain_get_irq_data(domain, virq);
1260 if (!irqd)
1261 return -EINVAL;
1262
1263 irqd->chip = ERR_PTR(-ENOTCONN);
1264 return 0;
1265}
1266EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1267
1268static int irq_domain_trim_hierarchy(unsigned int virq)
1269{
1270 struct irq_data *tail, *irqd, *irq_data;
1271
1272 irq_data = irq_get_irq_data(virq);
1273 tail = NULL;
1274
1275 /* The first entry must have a valid irqchip */
1276 if (!irq_data->chip || IS_ERR(irq_data->chip))
1277 return -EINVAL;
1278
1279 /*
1280 * Validate that the irq_data chain is sane in the presence of
1281 * a hierarchy trimming marker.
1282 */
1283 for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1284 /* Can't have a valid irqchip after a trim marker */
1285 if (irqd->chip && tail)
1286 return -EINVAL;
1287
1288 /* Can't have an empty irqchip before a trim marker */
1289 if (!irqd->chip && !tail)
1290 return -EINVAL;
1291
1292 if (IS_ERR(irqd->chip)) {
1293 /* Only -ENOTCONN is a valid trim marker */
1294 if (PTR_ERR(irqd->chip) != -ENOTCONN)
1295 return -EINVAL;
1296
1297 tail = irq_data;
1298 }
1299 }
1300
1301 /* No trim marker, nothing to do */
1302 if (!tail)
1303 return 0;
1304
1305 pr_info("IRQ%d: trimming hierarchy from %s\n",
1306 virq, tail->parent_data->domain->name);
1307
1308 /* Sever the inner part of the hierarchy... */
1309 irqd = tail;
1310 tail = tail->parent_data;
1311 irqd->parent_data = NULL;
1312 __irq_domain_free_hierarchy(tail);
1313
1314 return 0;
1315}
1316
1317static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1318 unsigned int virq, unsigned int nr_irqs)
1319{
1320 struct irq_data *irq_data;
1321 struct irq_domain *parent;
1322 int i;
1323
1324 /* The outermost irq_data is embedded in struct irq_desc */
1325 for (i = 0; i < nr_irqs; i++) {
1326 irq_data = irq_get_irq_data(virq + i);
1327 irq_data->domain = domain;
1328
1329 for (parent = domain->parent; parent; parent = parent->parent) {
1330 irq_data = irq_domain_insert_irq_data(parent, irq_data);
1331 if (!irq_data) {
1332 irq_domain_free_irq_data(virq, i + 1);
1333 return -ENOMEM;
1334 }
1335 }
1336 }
1337
1338 return 0;
1339}
1340
1341/**
1342 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1343 * @domain: domain to match
1344 * @virq: IRQ number to get irq_data
1345 */
1346struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1347 unsigned int virq)
1348{
1349 struct irq_data *irq_data;
1350
1351 for (irq_data = irq_get_irq_data(virq); irq_data;
1352 irq_data = irq_data->parent_data)
1353 if (irq_data->domain == domain)
1354 return irq_data;
1355
1356 return NULL;
1357}
1358EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1359
1360/**
1361 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1362 * @domain: Interrupt domain to match
1363 * @virq: IRQ number
1364 * @hwirq: The hwirq number
1365 * @chip: The associated interrupt chip
1366 * @chip_data: The associated chip data
1367 */
1368int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1369 irq_hw_number_t hwirq,
1370 const struct irq_chip *chip,
1371 void *chip_data)
1372{
1373 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1374
1375 if (!irq_data)
1376 return -ENOENT;
1377
1378 irq_data->hwirq = hwirq;
1379 irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1380 irq_data->chip_data = chip_data;
1381
1382 return 0;
1383}
1384EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1385
1386/**
1387 * irq_domain_set_info - Set the complete data for a @virq in @domain
1388 * @domain: Interrupt domain to match
1389 * @virq: IRQ number
1390 * @hwirq: The hardware interrupt number
1391 * @chip: The associated interrupt chip
1392 * @chip_data: The associated interrupt chip data
1393 * @handler: The interrupt flow handler
1394 * @handler_data: The interrupt flow handler data
1395 * @handler_name: The interrupt handler name
1396 */
1397void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1398 irq_hw_number_t hwirq, const struct irq_chip *chip,
1399 void *chip_data, irq_flow_handler_t handler,
1400 void *handler_data, const char *handler_name)
1401{
1402 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1403 __irq_set_handler(virq, handler, 0, handler_name);
1404 irq_set_handler_data(virq, handler_data);
1405}
1406EXPORT_SYMBOL(irq_domain_set_info);
1407
1408/**
1409 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1410 * @domain: Interrupt domain to match
1411 * @virq: IRQ number to start with
1412 * @nr_irqs: The number of irqs to free
1413 */
1414void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1415 unsigned int nr_irqs)
1416{
1417 struct irq_data *irq_data;
1418 int i;
1419
1420 for (i = 0; i < nr_irqs; i++) {
1421 irq_data = irq_domain_get_irq_data(domain, virq + i);
1422 if (irq_data)
1423 irq_domain_reset_irq_data(irq_data);
1424 }
1425 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1426}
1427EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1428
1429/**
1430 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1431 * @domain: Interrupt domain to match
1432 * @virq: IRQ number to start with
1433 * @nr_irqs: The number of irqs to free
1434 */
1435void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1436 unsigned int nr_irqs)
1437{
1438 int i;
1439
1440 for (i = 0; i < nr_irqs; i++) {
1441 irq_set_handler_data(virq + i, NULL);
1442 irq_set_handler(virq + i, NULL);
1443 }
1444 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1445}
1446
1447static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1448 unsigned int irq_base,
1449 unsigned int nr_irqs)
1450{
1451 unsigned int i;
1452
1453 if (!domain->ops->free)
1454 return;
1455
1456 for (i = 0; i < nr_irqs; i++) {
1457 if (irq_domain_get_irq_data(domain, irq_base + i))
1458 domain->ops->free(domain, irq_base + i, 1);
1459 }
1460}
1461
1462int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1463 unsigned int irq_base,
1464 unsigned int nr_irqs, void *arg)
1465{
1466 if (!domain->ops->alloc) {
1467 pr_debug("domain->ops->alloc() is NULL\n");
1468 return -ENOSYS;
1469 }
1470
1471 return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1472}
1473
1474static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1475 unsigned int nr_irqs, int node, void *arg,
1476 bool realloc, const struct irq_affinity_desc *affinity)
1477{
1478 int i, ret, virq;
1479
1480 if (realloc && irq_base >= 0) {
1481 virq = irq_base;
1482 } else {
1483 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1484 affinity);
1485 if (virq < 0) {
1486 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1487 irq_base, nr_irqs);
1488 return virq;
1489 }
1490 }
1491
1492 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1493 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1494 ret = -ENOMEM;
1495 goto out_free_desc;
1496 }
1497
1498 ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1499 if (ret < 0)
1500 goto out_free_irq_data;
1501
1502 for (i = 0; i < nr_irqs; i++) {
1503 ret = irq_domain_trim_hierarchy(virq + i);
1504 if (ret)
1505 goto out_free_irq_data;
1506 }
1507
1508 for (i = 0; i < nr_irqs; i++)
1509 irq_domain_insert_irq(virq + i);
1510
1511 return virq;
1512
1513out_free_irq_data:
1514 irq_domain_free_irq_data(virq, nr_irqs);
1515out_free_desc:
1516 irq_free_descs(virq, nr_irqs);
1517 return ret;
1518}
1519
1520/**
1521 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1522 * @domain: domain to allocate from
1523 * @irq_base: allocate specified IRQ number if irq_base >= 0
1524 * @nr_irqs: number of IRQs to allocate
1525 * @node: NUMA node id for memory allocation
1526 * @arg: domain specific argument
1527 * @realloc: IRQ descriptors have already been allocated if true
1528 * @affinity: Optional irq affinity mask for multiqueue devices
1529 *
1530 * Allocate IRQ numbers and initialized all data structures to support
1531 * hierarchy IRQ domains.
1532 * Parameter @realloc is mainly to support legacy IRQs.
1533 * Returns error code or allocated IRQ number
1534 *
1535 * The whole process to setup an IRQ has been split into two steps.
1536 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1537 * descriptor and required hardware resources. The second step,
1538 * irq_domain_activate_irq(), is to program the hardware with preallocated
1539 * resources. In this way, it's easier to rollback when failing to
1540 * allocate resources.
1541 */
1542int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1543 unsigned int nr_irqs, int node, void *arg,
1544 bool realloc, const struct irq_affinity_desc *affinity)
1545{
1546 int ret;
1547
1548 if (domain == NULL) {
1549 domain = irq_default_domain;
1550 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1551 return -EINVAL;
1552 }
1553
1554 mutex_lock(&domain->root->mutex);
1555 ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1556 realloc, affinity);
1557 mutex_unlock(&domain->root->mutex);
1558
1559 return ret;
1560}
1561EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1562
1563/* The irq_data was moved, fix the revmap to refer to the new location */
1564static void irq_domain_fix_revmap(struct irq_data *d)
1565{
1566 void __rcu **slot;
1567
1568 lockdep_assert_held(&d->domain->root->mutex);
1569
1570 if (irq_domain_is_nomap(d->domain))
1571 return;
1572
1573 /* Fix up the revmap. */
1574 if (d->hwirq < d->domain->revmap_size) {
1575 /* Not using radix tree */
1576 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1577 } else {
1578 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1579 if (slot)
1580 radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1581 }
1582}
1583
1584/**
1585 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1586 * @domain: Domain to push.
1587 * @virq: Irq to push the domain in to.
1588 * @arg: Passed to the irq_domain_ops alloc() function.
1589 *
1590 * For an already existing irqdomain hierarchy, as might be obtained
1591 * via a call to pci_enable_msix(), add an additional domain to the
1592 * head of the processing chain. Must be called before request_irq()
1593 * has been called.
1594 */
1595int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1596{
1597 struct irq_data *irq_data = irq_get_irq_data(virq);
1598 struct irq_data *parent_irq_data;
1599 struct irq_desc *desc;
1600 int rv = 0;
1601
1602 /*
1603 * Check that no action has been set, which indicates the virq
1604 * is in a state where this function doesn't have to deal with
1605 * races between interrupt handling and maintaining the
1606 * hierarchy. This will catch gross misuse. Attempting to
1607 * make the check race free would require holding locks across
1608 * calls to struct irq_domain_ops->alloc(), which could lead
1609 * to deadlock, so we just do a simple check before starting.
1610 */
1611 desc = irq_to_desc(virq);
1612 if (!desc)
1613 return -EINVAL;
1614 if (WARN_ON(desc->action))
1615 return -EBUSY;
1616
1617 if (domain == NULL)
1618 return -EINVAL;
1619
1620 if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1621 return -EINVAL;
1622
1623 if (!irq_data)
1624 return -EINVAL;
1625
1626 if (domain->parent != irq_data->domain)
1627 return -EINVAL;
1628
1629 parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1630 irq_data_get_node(irq_data));
1631 if (!parent_irq_data)
1632 return -ENOMEM;
1633
1634 mutex_lock(&domain->root->mutex);
1635
1636 /* Copy the original irq_data. */
1637 *parent_irq_data = *irq_data;
1638
1639 /*
1640 * Overwrite the irq_data, which is embedded in struct irq_desc, with
1641 * values for this domain.
1642 */
1643 irq_data->parent_data = parent_irq_data;
1644 irq_data->domain = domain;
1645 irq_data->mask = 0;
1646 irq_data->hwirq = 0;
1647 irq_data->chip = NULL;
1648 irq_data->chip_data = NULL;
1649
1650 /* May (probably does) set hwirq, chip, etc. */
1651 rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1652 if (rv) {
1653 /* Restore the original irq_data. */
1654 *irq_data = *parent_irq_data;
1655 kfree(parent_irq_data);
1656 goto error;
1657 }
1658
1659 irq_domain_fix_revmap(parent_irq_data);
1660 irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
1661error:
1662 mutex_unlock(&domain->root->mutex);
1663
1664 return rv;
1665}
1666EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1667
1668/**
1669 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1670 * @domain: Domain to remove.
1671 * @virq: Irq to remove the domain from.
1672 *
1673 * Undo the effects of a call to irq_domain_push_irq(). Must be
1674 * called either before request_irq() or after free_irq().
1675 */
1676int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1677{
1678 struct irq_data *irq_data = irq_get_irq_data(virq);
1679 struct irq_data *parent_irq_data;
1680 struct irq_data *tmp_irq_data;
1681 struct irq_desc *desc;
1682
1683 /*
1684 * Check that no action is set, which indicates the virq is in
1685 * a state where this function doesn't have to deal with races
1686 * between interrupt handling and maintaining the hierarchy.
1687 * This will catch gross misuse. Attempting to make the check
1688 * race free would require holding locks across calls to
1689 * struct irq_domain_ops->free(), which could lead to
1690 * deadlock, so we just do a simple check before starting.
1691 */
1692 desc = irq_to_desc(virq);
1693 if (!desc)
1694 return -EINVAL;
1695 if (WARN_ON(desc->action))
1696 return -EBUSY;
1697
1698 if (domain == NULL)
1699 return -EINVAL;
1700
1701 if (!irq_data)
1702 return -EINVAL;
1703
1704 tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1705
1706 /* We can only "pop" if this domain is at the top of the list */
1707 if (WARN_ON(irq_data != tmp_irq_data))
1708 return -EINVAL;
1709
1710 if (WARN_ON(irq_data->domain != domain))
1711 return -EINVAL;
1712
1713 parent_irq_data = irq_data->parent_data;
1714 if (WARN_ON(!parent_irq_data))
1715 return -EINVAL;
1716
1717 mutex_lock(&domain->root->mutex);
1718
1719 irq_data->parent_data = NULL;
1720
1721 irq_domain_clear_mapping(domain, irq_data->hwirq);
1722 irq_domain_free_irqs_hierarchy(domain, virq, 1);
1723
1724 /* Restore the original irq_data. */
1725 *irq_data = *parent_irq_data;
1726
1727 irq_domain_fix_revmap(irq_data);
1728
1729 mutex_unlock(&domain->root->mutex);
1730
1731 kfree(parent_irq_data);
1732
1733 return 0;
1734}
1735EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1736
1737/**
1738 * irq_domain_free_irqs - Free IRQ number and associated data structures
1739 * @virq: base IRQ number
1740 * @nr_irqs: number of IRQs to free
1741 */
1742void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1743{
1744 struct irq_data *data = irq_get_irq_data(virq);
1745 struct irq_domain *domain;
1746 int i;
1747
1748 if (WARN(!data || !data->domain || !data->domain->ops->free,
1749 "NULL pointer, cannot free irq\n"))
1750 return;
1751
1752 domain = data->domain;
1753
1754 mutex_lock(&domain->root->mutex);
1755 for (i = 0; i < nr_irqs; i++)
1756 irq_domain_remove_irq(virq + i);
1757 irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
1758 mutex_unlock(&domain->root->mutex);
1759
1760 irq_domain_free_irq_data(virq, nr_irqs);
1761 irq_free_descs(virq, nr_irqs);
1762}
1763
1764static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq)
1765{
1766 if (irq_domain_is_msi_device(domain))
1767 msi_device_domain_free_wired(domain, virq);
1768 else
1769 irq_domain_free_irqs(virq, 1);
1770}
1771
1772/**
1773 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1774 * @domain: Domain below which interrupts must be allocated
1775 * @irq_base: Base IRQ number
1776 * @nr_irqs: Number of IRQs to allocate
1777 * @arg: Allocation data (arch/domain specific)
1778 */
1779int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1780 unsigned int irq_base, unsigned int nr_irqs,
1781 void *arg)
1782{
1783 if (!domain->parent)
1784 return -ENOSYS;
1785
1786 return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1787 nr_irqs, arg);
1788}
1789EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1790
1791/**
1792 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1793 * @domain: Domain below which interrupts must be freed
1794 * @irq_base: Base IRQ number
1795 * @nr_irqs: Number of IRQs to free
1796 */
1797void irq_domain_free_irqs_parent(struct irq_domain *domain,
1798 unsigned int irq_base, unsigned int nr_irqs)
1799{
1800 if (!domain->parent)
1801 return;
1802
1803 irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1804}
1805EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1806
1807static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1808{
1809 if (irq_data && irq_data->domain) {
1810 struct irq_domain *domain = irq_data->domain;
1811
1812 if (domain->ops->deactivate)
1813 domain->ops->deactivate(domain, irq_data);
1814 if (irq_data->parent_data)
1815 __irq_domain_deactivate_irq(irq_data->parent_data);
1816 }
1817}
1818
1819static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1820{
1821 int ret = 0;
1822
1823 if (irqd && irqd->domain) {
1824 struct irq_domain *domain = irqd->domain;
1825
1826 if (irqd->parent_data)
1827 ret = __irq_domain_activate_irq(irqd->parent_data,
1828 reserve);
1829 if (!ret && domain->ops->activate) {
1830 ret = domain->ops->activate(domain, irqd, reserve);
1831 /* Rollback in case of error */
1832 if (ret && irqd->parent_data)
1833 __irq_domain_deactivate_irq(irqd->parent_data);
1834 }
1835 }
1836 return ret;
1837}
1838
1839/**
1840 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1841 * interrupt
1842 * @irq_data: Outermost irq_data associated with interrupt
1843 * @reserve: If set only reserve an interrupt vector instead of assigning one
1844 *
1845 * This is the second step to call domain_ops->activate to program interrupt
1846 * controllers, so the interrupt could actually get delivered.
1847 */
1848int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1849{
1850 int ret = 0;
1851
1852 if (!irqd_is_activated(irq_data))
1853 ret = __irq_domain_activate_irq(irq_data, reserve);
1854 if (!ret)
1855 irqd_set_activated(irq_data);
1856 return ret;
1857}
1858
1859/**
1860 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1861 * deactivate interrupt
1862 * @irq_data: outermost irq_data associated with interrupt
1863 *
1864 * It calls domain_ops->deactivate to program interrupt controllers to disable
1865 * interrupt delivery.
1866 */
1867void irq_domain_deactivate_irq(struct irq_data *irq_data)
1868{
1869 if (irqd_is_activated(irq_data)) {
1870 __irq_domain_deactivate_irq(irq_data);
1871 irqd_clr_activated(irq_data);
1872 }
1873}
1874
1875static void irq_domain_check_hierarchy(struct irq_domain *domain)
1876{
1877 /* Hierarchy irq_domains must implement callback alloc() */
1878 if (domain->ops->alloc)
1879 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1880}
1881#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1882/**
1883 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1884 * @domain: domain to match
1885 * @virq: IRQ number to get irq_data
1886 */
1887struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1888 unsigned int virq)
1889{
1890 struct irq_data *irq_data = irq_get_irq_data(virq);
1891
1892 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1893}
1894EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1895
1896/**
1897 * irq_domain_set_info - Set the complete data for a @virq in @domain
1898 * @domain: Interrupt domain to match
1899 * @virq: IRQ number
1900 * @hwirq: The hardware interrupt number
1901 * @chip: The associated interrupt chip
1902 * @chip_data: The associated interrupt chip data
1903 * @handler: The interrupt flow handler
1904 * @handler_data: The interrupt flow handler data
1905 * @handler_name: The interrupt handler name
1906 */
1907void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1908 irq_hw_number_t hwirq, const struct irq_chip *chip,
1909 void *chip_data, irq_flow_handler_t handler,
1910 void *handler_data, const char *handler_name)
1911{
1912 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1913 irq_set_chip_data(virq, chip_data);
1914 irq_set_handler_data(virq, handler_data);
1915}
1916
1917static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1918 unsigned int nr_irqs, int node, void *arg,
1919 bool realloc, const struct irq_affinity_desc *affinity)
1920{
1921 return -EINVAL;
1922}
1923
1924static void irq_domain_check_hierarchy(struct irq_domain *domain) { }
1925static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq) { }
1926
1927#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1928
1929#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1930#include "internals.h"
1931
1932static struct dentry *domain_dir;
1933
1934static void
1935irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1936{
1937 seq_printf(m, "%*sname: %s\n", ind, "", d->name);
1938 seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size);
1939 seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1940 seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
1941 if (d->ops && d->ops->debug_show)
1942 d->ops->debug_show(m, d, NULL, ind + 1);
1943#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1944 if (!d->parent)
1945 return;
1946 seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1947 irq_domain_debug_show_one(m, d->parent, ind + 4);
1948#endif
1949}
1950
1951static int irq_domain_debug_show(struct seq_file *m, void *p)
1952{
1953 struct irq_domain *d = m->private;
1954
1955 /* Default domain? Might be NULL */
1956 if (!d) {
1957 if (!irq_default_domain)
1958 return 0;
1959 d = irq_default_domain;
1960 }
1961 irq_domain_debug_show_one(m, d, 0);
1962 return 0;
1963}
1964DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1965
1966static void debugfs_add_domain_dir(struct irq_domain *d)
1967{
1968 if (!d->name || !domain_dir)
1969 return;
1970 debugfs_create_file(d->name, 0444, domain_dir, d,
1971 &irq_domain_debug_fops);
1972}
1973
1974static void debugfs_remove_domain_dir(struct irq_domain *d)
1975{
1976 debugfs_lookup_and_remove(d->name, domain_dir);
1977}
1978
1979void __init irq_domain_debugfs_init(struct dentry *root)
1980{
1981 struct irq_domain *d;
1982
1983 domain_dir = debugfs_create_dir("domains", root);
1984
1985 debugfs_create_file("default", 0444, domain_dir, NULL,
1986 &irq_domain_debug_fops);
1987 mutex_lock(&irq_domain_mutex);
1988 list_for_each_entry(d, &irq_domain_list, link)
1989 debugfs_add_domain_dir(d);
1990 mutex_unlock(&irq_domain_mutex);
1991}
1992#endif