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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/seq_file.h>
14#include <linux/slab.h>
15#include <linux/smp.h>
16#include <linux/fs.h>
17
18#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
19 * ie. legacy 8259, gets irqs 1..15 */
20#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
21#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
22#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
23
24static LIST_HEAD(irq_domain_list);
25static DEFINE_MUTEX(irq_domain_mutex);
26
27static DEFINE_MUTEX(revmap_trees_mutex);
28static struct irq_domain *irq_default_domain;
29
30/**
31 * irq_domain_alloc() - Allocate a new irq_domain data structure
32 * @of_node: optional device-tree node of the interrupt controller
33 * @revmap_type: type of reverse mapping to use
34 * @ops: map/unmap domain callbacks
35 * @host_data: Controller private data pointer
36 *
37 * Allocates and initialize and irq_domain structure. Caller is expected to
38 * register allocated irq_domain with irq_domain_register(). Returns pointer
39 * to IRQ domain, or NULL on failure.
40 */
41static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
42 unsigned int revmap_type,
43 const struct irq_domain_ops *ops,
44 void *host_data)
45{
46 struct irq_domain *domain;
47
48 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
49 if (WARN_ON(!domain))
50 return NULL;
51
52 /* Fill structure */
53 domain->revmap_type = revmap_type;
54 domain->ops = ops;
55 domain->host_data = host_data;
56 domain->of_node = of_node_get(of_node);
57
58 return domain;
59}
60
61static void irq_domain_free(struct irq_domain *domain)
62{
63 of_node_put(domain->of_node);
64 kfree(domain);
65}
66
67static void irq_domain_add(struct irq_domain *domain)
68{
69 mutex_lock(&irq_domain_mutex);
70 list_add(&domain->link, &irq_domain_list);
71 mutex_unlock(&irq_domain_mutex);
72 pr_debug("Allocated domain of type %d @0x%p\n",
73 domain->revmap_type, domain);
74}
75
76/**
77 * irq_domain_remove() - Remove an irq domain.
78 * @domain: domain to remove
79 *
80 * This routine is used to remove an irq domain. The caller must ensure
81 * that all mappings within the domain have been disposed of prior to
82 * use, depending on the revmap type.
83 */
84void irq_domain_remove(struct irq_domain *domain)
85{
86 mutex_lock(&irq_domain_mutex);
87
88 switch (domain->revmap_type) {
89 case IRQ_DOMAIN_MAP_LEGACY:
90 /*
91 * Legacy domains don't manage their own irq_desc
92 * allocations, we expect the caller to handle irq_desc
93 * freeing on their own.
94 */
95 break;
96 case IRQ_DOMAIN_MAP_TREE:
97 /*
98 * radix_tree_delete() takes care of destroying the root
99 * node when all entries are removed. Shout if there are
100 * any mappings left.
101 */
102 WARN_ON(domain->revmap_data.tree.height);
103 break;
104 case IRQ_DOMAIN_MAP_LINEAR:
105 kfree(domain->revmap_data.linear.revmap);
106 domain->revmap_data.linear.size = 0;
107 break;
108 case IRQ_DOMAIN_MAP_NOMAP:
109 break;
110 }
111
112 list_del(&domain->link);
113
114 /*
115 * If the going away domain is the default one, reset it.
116 */
117 if (unlikely(irq_default_domain == domain))
118 irq_set_default_host(NULL);
119
120 mutex_unlock(&irq_domain_mutex);
121
122 pr_debug("Removed domain of type %d @0x%p\n",
123 domain->revmap_type, domain);
124
125 irq_domain_free(domain);
126}
127EXPORT_SYMBOL_GPL(irq_domain_remove);
128
129static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
130 irq_hw_number_t hwirq)
131{
132 irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
133 int size = domain->revmap_data.legacy.size;
134
135 if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
136 return 0;
137 return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
138}
139
140/**
141 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
142 * @of_node: pointer to interrupt controller's device tree node.
143 * @size: total number of irqs in legacy mapping
144 * @first_irq: first number of irq block assigned to the domain
145 * @first_hwirq: first hwirq number to use for the translation. Should normally
146 * be '0', but a positive integer can be used if the effective
147 * hwirqs numbering does not begin at zero.
148 * @ops: map/unmap domain callbacks
149 * @host_data: Controller private data pointer
150 *
151 * Note: the map() callback will be called before this function returns
152 * for all legacy interrupts except 0 (which is always the invalid irq for
153 * a legacy controller).
154 */
155struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
156 unsigned int size,
157 unsigned int first_irq,
158 irq_hw_number_t first_hwirq,
159 const struct irq_domain_ops *ops,
160 void *host_data)
161{
162 struct irq_domain *domain;
163 unsigned int i;
164
165 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
166 if (!domain)
167 return NULL;
168
169 domain->revmap_data.legacy.first_irq = first_irq;
170 domain->revmap_data.legacy.first_hwirq = first_hwirq;
171 domain->revmap_data.legacy.size = size;
172
173 mutex_lock(&irq_domain_mutex);
174 /* Verify that all the irqs are available */
175 for (i = 0; i < size; i++) {
176 int irq = first_irq + i;
177 struct irq_data *irq_data = irq_get_irq_data(irq);
178
179 if (WARN_ON(!irq_data || irq_data->domain)) {
180 mutex_unlock(&irq_domain_mutex);
181 irq_domain_free(domain);
182 return NULL;
183 }
184 }
185
186 /* Claim all of the irqs before registering a legacy domain */
187 for (i = 0; i < size; i++) {
188 struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
189 irq_data->hwirq = first_hwirq + i;
190 irq_data->domain = domain;
191 }
192 mutex_unlock(&irq_domain_mutex);
193
194 for (i = 0; i < size; i++) {
195 int irq = first_irq + i;
196 int hwirq = first_hwirq + i;
197
198 /* IRQ0 gets ignored */
199 if (!irq)
200 continue;
201
202 /* Legacy flags are left to default at this point,
203 * one can then use irq_create_mapping() to
204 * explicitly change them
205 */
206 ops->map(domain, irq, hwirq);
207
208 /* Clear norequest flags */
209 irq_clear_status_flags(irq, IRQ_NOREQUEST);
210 }
211
212 irq_domain_add(domain);
213 return domain;
214}
215EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
216
217/**
218 * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain.
219 * @of_node: pointer to interrupt controller's device tree node.
220 * @size: Number of interrupts in the domain.
221 * @ops: map/unmap domain callbacks
222 * @host_data: Controller private data pointer
223 */
224struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
225 unsigned int size,
226 const struct irq_domain_ops *ops,
227 void *host_data)
228{
229 struct irq_domain *domain;
230 unsigned int *revmap;
231
232 revmap = kzalloc(sizeof(*revmap) * size, GFP_KERNEL);
233 if (WARN_ON(!revmap))
234 return NULL;
235
236 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
237 if (!domain) {
238 kfree(revmap);
239 return NULL;
240 }
241 domain->revmap_data.linear.size = size;
242 domain->revmap_data.linear.revmap = revmap;
243 irq_domain_add(domain);
244 return domain;
245}
246EXPORT_SYMBOL_GPL(irq_domain_add_linear);
247
248struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
249 unsigned int max_irq,
250 const struct irq_domain_ops *ops,
251 void *host_data)
252{
253 struct irq_domain *domain = irq_domain_alloc(of_node,
254 IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
255 if (domain) {
256 domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
257 irq_domain_add(domain);
258 }
259 return domain;
260}
261EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
262
263/**
264 * irq_domain_add_tree()
265 * @of_node: pointer to interrupt controller's device tree node.
266 * @ops: map/unmap domain callbacks
267 *
268 * Note: The radix tree will be allocated later during boot automatically
269 * (the reverse mapping will use the slow path until that happens).
270 */
271struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
272 const struct irq_domain_ops *ops,
273 void *host_data)
274{
275 struct irq_domain *domain = irq_domain_alloc(of_node,
276 IRQ_DOMAIN_MAP_TREE, ops, host_data);
277 if (domain) {
278 INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
279 irq_domain_add(domain);
280 }
281 return domain;
282}
283EXPORT_SYMBOL_GPL(irq_domain_add_tree);
284
285/**
286 * irq_find_host() - Locates a domain for a given device node
287 * @node: device-tree node of the interrupt controller
288 */
289struct irq_domain *irq_find_host(struct device_node *node)
290{
291 struct irq_domain *h, *found = NULL;
292 int rc;
293
294 /* We might want to match the legacy controller last since
295 * it might potentially be set to match all interrupts in
296 * the absence of a device node. This isn't a problem so far
297 * yet though...
298 */
299 mutex_lock(&irq_domain_mutex);
300 list_for_each_entry(h, &irq_domain_list, link) {
301 if (h->ops->match)
302 rc = h->ops->match(h, node);
303 else
304 rc = (h->of_node != NULL) && (h->of_node == node);
305
306 if (rc) {
307 found = h;
308 break;
309 }
310 }
311 mutex_unlock(&irq_domain_mutex);
312 return found;
313}
314EXPORT_SYMBOL_GPL(irq_find_host);
315
316/**
317 * irq_set_default_host() - Set a "default" irq domain
318 * @domain: default domain pointer
319 *
320 * For convenience, it's possible to set a "default" domain that will be used
321 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
322 * platforms that want to manipulate a few hard coded interrupt numbers that
323 * aren't properly represented in the device-tree.
324 */
325void irq_set_default_host(struct irq_domain *domain)
326{
327 pr_debug("Default domain set to @0x%p\n", domain);
328
329 irq_default_domain = domain;
330}
331EXPORT_SYMBOL_GPL(irq_set_default_host);
332
333static int irq_setup_virq(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
338 irq_data->hwirq = hwirq;
339 irq_data->domain = domain;
340 if (domain->ops->map(domain, virq, hwirq)) {
341 pr_debug("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq);
342 irq_data->domain = NULL;
343 irq_data->hwirq = 0;
344 return -1;
345 }
346
347 irq_clear_status_flags(virq, IRQ_NOREQUEST);
348
349 return 0;
350}
351
352/**
353 * irq_create_direct_mapping() - Allocate an irq for direct mapping
354 * @domain: domain to allocate the irq for or NULL for default domain
355 *
356 * This routine is used for irq controllers which can choose the hardware
357 * interrupt numbers they generate. In such a case it's simplest to use
358 * the linux irq as the hardware interrupt number.
359 */
360unsigned int irq_create_direct_mapping(struct irq_domain *domain)
361{
362 unsigned int virq;
363
364 if (domain == NULL)
365 domain = irq_default_domain;
366
367 BUG_ON(domain == NULL);
368 WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP);
369
370 virq = irq_alloc_desc_from(1, 0);
371 if (!virq) {
372 pr_debug("create_direct virq allocation failed\n");
373 return 0;
374 }
375 if (virq >= domain->revmap_data.nomap.max_irq) {
376 pr_err("ERROR: no free irqs available below %i maximum\n",
377 domain->revmap_data.nomap.max_irq);
378 irq_free_desc(virq);
379 return 0;
380 }
381 pr_debug("create_direct obtained virq %d\n", virq);
382
383 if (irq_setup_virq(domain, virq, virq)) {
384 irq_free_desc(virq);
385 return 0;
386 }
387
388 return virq;
389}
390EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
391
392/**
393 * irq_create_mapping() - Map a hardware interrupt into linux irq space
394 * @domain: domain owning this hardware interrupt or NULL for default domain
395 * @hwirq: hardware irq number in that domain space
396 *
397 * Only one mapping per hardware interrupt is permitted. Returns a linux
398 * irq number.
399 * If the sense/trigger is to be specified, set_irq_type() should be called
400 * on the number returned from that call.
401 */
402unsigned int irq_create_mapping(struct irq_domain *domain,
403 irq_hw_number_t hwirq)
404{
405 unsigned int hint;
406 int virq;
407
408 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
409
410 /* Look for default domain if nececssary */
411 if (domain == NULL)
412 domain = irq_default_domain;
413 if (domain == NULL) {
414 pr_warning("irq_create_mapping called for"
415 " NULL domain, hwirq=%lx\n", hwirq);
416 WARN_ON(1);
417 return 0;
418 }
419 pr_debug("-> using domain @%p\n", domain);
420
421 /* Check if mapping already exists */
422 virq = irq_find_mapping(domain, hwirq);
423 if (virq) {
424 pr_debug("-> existing mapping on virq %d\n", virq);
425 return virq;
426 }
427
428 /* Get a virtual interrupt number */
429 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
430 return irq_domain_legacy_revmap(domain, hwirq);
431
432 /* Allocate a virtual interrupt number */
433 hint = hwirq % nr_irqs;
434 if (hint == 0)
435 hint++;
436 virq = irq_alloc_desc_from(hint, 0);
437 if (virq <= 0)
438 virq = irq_alloc_desc_from(1, 0);
439 if (virq <= 0) {
440 pr_debug("-> virq allocation failed\n");
441 return 0;
442 }
443
444 if (irq_setup_virq(domain, virq, hwirq)) {
445 if (domain->revmap_type != IRQ_DOMAIN_MAP_LEGACY)
446 irq_free_desc(virq);
447 return 0;
448 }
449
450 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
451 hwirq, domain->of_node ? domain->of_node->full_name : "null", virq);
452
453 return virq;
454}
455EXPORT_SYMBOL_GPL(irq_create_mapping);
456
457unsigned int irq_create_of_mapping(struct device_node *controller,
458 const u32 *intspec, unsigned int intsize)
459{
460 struct irq_domain *domain;
461 irq_hw_number_t hwirq;
462 unsigned int type = IRQ_TYPE_NONE;
463 unsigned int virq;
464
465 domain = controller ? irq_find_host(controller) : irq_default_domain;
466 if (!domain) {
467#ifdef CONFIG_MIPS
468 /*
469 * Workaround to avoid breaking interrupt controller drivers
470 * that don't yet register an irq_domain. This is temporary
471 * code. ~~~gcl, Feb 24, 2012
472 *
473 * Scheduled for removal in Linux v3.6. That should be enough
474 * time.
475 */
476 if (intsize > 0)
477 return intspec[0];
478#endif
479 pr_warning("no irq domain found for %s !\n",
480 controller->full_name);
481 return 0;
482 }
483
484 /* If domain has no translation, then we assume interrupt line */
485 if (domain->ops->xlate == NULL)
486 hwirq = intspec[0];
487 else {
488 if (domain->ops->xlate(domain, controller, intspec, intsize,
489 &hwirq, &type))
490 return 0;
491 }
492
493 /* Create mapping */
494 virq = irq_create_mapping(domain, hwirq);
495 if (!virq)
496 return virq;
497
498 /* Set type if specified and different than the current one */
499 if (type != IRQ_TYPE_NONE &&
500 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
501 irq_set_irq_type(virq, type);
502 return virq;
503}
504EXPORT_SYMBOL_GPL(irq_create_of_mapping);
505
506/**
507 * irq_dispose_mapping() - Unmap an interrupt
508 * @virq: linux irq number of the interrupt to unmap
509 */
510void irq_dispose_mapping(unsigned int virq)
511{
512 struct irq_data *irq_data = irq_get_irq_data(virq);
513 struct irq_domain *domain;
514 irq_hw_number_t hwirq;
515
516 if (!virq || !irq_data)
517 return;
518
519 domain = irq_data->domain;
520 if (WARN_ON(domain == NULL))
521 return;
522
523 /* Never unmap legacy interrupts */
524 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
525 return;
526
527 irq_set_status_flags(virq, IRQ_NOREQUEST);
528
529 /* remove chip and handler */
530 irq_set_chip_and_handler(virq, NULL, NULL);
531
532 /* Make sure it's completed */
533 synchronize_irq(virq);
534
535 /* Tell the PIC about it */
536 if (domain->ops->unmap)
537 domain->ops->unmap(domain, virq);
538 smp_mb();
539
540 /* Clear reverse map */
541 hwirq = irq_data->hwirq;
542 switch(domain->revmap_type) {
543 case IRQ_DOMAIN_MAP_LINEAR:
544 if (hwirq < domain->revmap_data.linear.size)
545 domain->revmap_data.linear.revmap[hwirq] = 0;
546 break;
547 case IRQ_DOMAIN_MAP_TREE:
548 mutex_lock(&revmap_trees_mutex);
549 radix_tree_delete(&domain->revmap_data.tree, hwirq);
550 mutex_unlock(&revmap_trees_mutex);
551 break;
552 }
553
554 irq_free_desc(virq);
555}
556EXPORT_SYMBOL_GPL(irq_dispose_mapping);
557
558/**
559 * irq_find_mapping() - Find a linux irq from an hw irq number.
560 * @domain: domain owning this hardware interrupt
561 * @hwirq: hardware irq number in that domain space
562 *
563 * This is a slow path, for use by generic code. It's expected that an
564 * irq controller implementation directly calls the appropriate low level
565 * mapping function.
566 */
567unsigned int irq_find_mapping(struct irq_domain *domain,
568 irq_hw_number_t hwirq)
569{
570 unsigned int i;
571 unsigned int hint = hwirq % nr_irqs;
572
573 /* Look for default domain if nececssary */
574 if (domain == NULL)
575 domain = irq_default_domain;
576 if (domain == NULL)
577 return 0;
578
579 /* legacy -> bail early */
580 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
581 return irq_domain_legacy_revmap(domain, hwirq);
582
583 /* Slow path does a linear search of the map */
584 if (hint == 0)
585 hint = 1;
586 i = hint;
587 do {
588 struct irq_data *data = irq_get_irq_data(i);
589 if (data && (data->domain == domain) && (data->hwirq == hwirq))
590 return i;
591 i++;
592 if (i >= nr_irqs)
593 i = 1;
594 } while(i != hint);
595 return 0;
596}
597EXPORT_SYMBOL_GPL(irq_find_mapping);
598
599/**
600 * irq_radix_revmap_lookup() - Find a linux irq from a hw irq number.
601 * @domain: domain owning this hardware interrupt
602 * @hwirq: hardware irq number in that domain space
603 *
604 * This is a fast path, for use by irq controller code that uses radix tree
605 * revmaps
606 */
607unsigned int irq_radix_revmap_lookup(struct irq_domain *domain,
608 irq_hw_number_t hwirq)
609{
610 struct irq_data *irq_data;
611
612 if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
613 return irq_find_mapping(domain, hwirq);
614
615 /*
616 * Freeing an irq can delete nodes along the path to
617 * do the lookup via call_rcu.
618 */
619 rcu_read_lock();
620 irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
621 rcu_read_unlock();
622
623 /*
624 * If found in radix tree, then fine.
625 * Else fallback to linear lookup - this should not happen in practice
626 * as it means that we failed to insert the node in the radix tree.
627 */
628 return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq);
629}
630EXPORT_SYMBOL_GPL(irq_radix_revmap_lookup);
631
632/**
633 * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping.
634 * @domain: domain owning this hardware interrupt
635 * @virq: linux irq number
636 * @hwirq: hardware irq number in that domain space
637 *
638 * This is for use by irq controllers that use a radix tree reverse
639 * mapping for fast lookup.
640 */
641void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq,
642 irq_hw_number_t hwirq)
643{
644 struct irq_data *irq_data = irq_get_irq_data(virq);
645
646 if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
647 return;
648
649 if (virq) {
650 mutex_lock(&revmap_trees_mutex);
651 radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
652 mutex_unlock(&revmap_trees_mutex);
653 }
654}
655EXPORT_SYMBOL_GPL(irq_radix_revmap_insert);
656
657/**
658 * irq_linear_revmap() - Find a linux irq from a hw irq number.
659 * @domain: domain owning this hardware interrupt
660 * @hwirq: hardware irq number in that domain space
661 *
662 * This is a fast path, for use by irq controller code that uses linear
663 * revmaps. It does fallback to the slow path if the revmap doesn't exist
664 * yet and will create the revmap entry with appropriate locking
665 */
666unsigned int irq_linear_revmap(struct irq_domain *domain,
667 irq_hw_number_t hwirq)
668{
669 unsigned int *revmap;
670
671 if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR))
672 return irq_find_mapping(domain, hwirq);
673
674 /* Check revmap bounds */
675 if (unlikely(hwirq >= domain->revmap_data.linear.size))
676 return irq_find_mapping(domain, hwirq);
677
678 /* Check if revmap was allocated */
679 revmap = domain->revmap_data.linear.revmap;
680 if (unlikely(revmap == NULL))
681 return irq_find_mapping(domain, hwirq);
682
683 /* Fill up revmap with slow path if no mapping found */
684 if (unlikely(!revmap[hwirq]))
685 revmap[hwirq] = irq_find_mapping(domain, hwirq);
686
687 return revmap[hwirq];
688}
689EXPORT_SYMBOL_GPL(irq_linear_revmap);
690
691#ifdef CONFIG_IRQ_DOMAIN_DEBUG
692static int virq_debug_show(struct seq_file *m, void *private)
693{
694 unsigned long flags;
695 struct irq_desc *desc;
696 const char *p;
697 static const char none[] = "none";
698 void *data;
699 int i;
700
701 seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq",
702 "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
703 "domain name");
704
705 for (i = 1; i < nr_irqs; i++) {
706 desc = irq_to_desc(i);
707 if (!desc)
708 continue;
709
710 raw_spin_lock_irqsave(&desc->lock, flags);
711
712 if (desc->action && desc->action->handler) {
713 struct irq_chip *chip;
714
715 seq_printf(m, "%5d ", i);
716 seq_printf(m, "0x%05lx ", desc->irq_data.hwirq);
717
718 chip = irq_desc_get_chip(desc);
719 if (chip && chip->name)
720 p = chip->name;
721 else
722 p = none;
723 seq_printf(m, "%-15s ", p);
724
725 data = irq_desc_get_chip_data(desc);
726 seq_printf(m, data ? "0x%p " : " %p ", data);
727
728 if (desc->irq_data.domain && desc->irq_data.domain->of_node)
729 p = desc->irq_data.domain->of_node->full_name;
730 else
731 p = none;
732 seq_printf(m, "%s\n", p);
733 }
734
735 raw_spin_unlock_irqrestore(&desc->lock, flags);
736 }
737
738 return 0;
739}
740
741static int virq_debug_open(struct inode *inode, struct file *file)
742{
743 return single_open(file, virq_debug_show, inode->i_private);
744}
745
746static const struct file_operations virq_debug_fops = {
747 .open = virq_debug_open,
748 .read = seq_read,
749 .llseek = seq_lseek,
750 .release = single_release,
751};
752
753static int __init irq_debugfs_init(void)
754{
755 if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
756 NULL, &virq_debug_fops) == NULL)
757 return -ENOMEM;
758
759 return 0;
760}
761__initcall(irq_debugfs_init);
762#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
763
764static int irq_domain_simple_map(struct irq_domain *d, unsigned int irq,
765 irq_hw_number_t hwirq)
766{
767 return 0;
768}
769
770/**
771 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
772 *
773 * Device Tree IRQ specifier translation function which works with one cell
774 * bindings where the cell value maps directly to the hwirq number.
775 */
776int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
777 const u32 *intspec, unsigned int intsize,
778 unsigned long *out_hwirq, unsigned int *out_type)
779{
780 if (WARN_ON(intsize < 1))
781 return -EINVAL;
782 *out_hwirq = intspec[0];
783 *out_type = IRQ_TYPE_NONE;
784 return 0;
785}
786EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
787
788/**
789 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
790 *
791 * Device Tree IRQ specifier translation function which works with two cell
792 * bindings where the cell values map directly to the hwirq number
793 * and linux irq flags.
794 */
795int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
796 const u32 *intspec, unsigned int intsize,
797 irq_hw_number_t *out_hwirq, unsigned int *out_type)
798{
799 if (WARN_ON(intsize < 2))
800 return -EINVAL;
801 *out_hwirq = intspec[0];
802 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
803 return 0;
804}
805EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
806
807/**
808 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
809 *
810 * Device Tree IRQ specifier translation function which works with either one
811 * or two cell bindings where the cell values map directly to the hwirq number
812 * and linux irq flags.
813 *
814 * Note: don't use this function unless your interrupt controller explicitly
815 * supports both one and two cell bindings. For the majority of controllers
816 * the _onecell() or _twocell() variants above should be used.
817 */
818int irq_domain_xlate_onetwocell(struct irq_domain *d,
819 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 = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
827 return 0;
828}
829EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
830
831const struct irq_domain_ops irq_domain_simple_ops = {
832 .map = irq_domain_simple_map,
833 .xlate = irq_domain_xlate_onetwocell,
834};
835EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
836
837#ifdef CONFIG_OF_IRQ
838void irq_domain_generate_simple(const struct of_device_id *match,
839 u64 phys_base, unsigned int irq_start)
840{
841 struct device_node *node;
842 pr_debug("looking for phys_base=%llx, irq_start=%i\n",
843 (unsigned long long) phys_base, (int) irq_start);
844 node = of_find_matching_node_by_address(NULL, match, phys_base);
845 if (node)
846 irq_domain_add_legacy(node, 32, irq_start, 0,
847 &irq_domain_simple_ops, NULL);
848}
849EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
850#endif
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 void irq_domain_check_hierarchy(struct irq_domain *domain);
29
30struct irqchip_fwid {
31 struct fwnode_handle fwnode;
32 unsigned int type;
33 char *name;
34 phys_addr_t *pa;
35};
36
37#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
38static void debugfs_add_domain_dir(struct irq_domain *d);
39static void debugfs_remove_domain_dir(struct irq_domain *d);
40#else
41static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
42static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
43#endif
44
45static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
46{
47 struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
48
49 return fwid->name;
50}
51
52const struct fwnode_operations irqchip_fwnode_ops = {
53 .get_name = irqchip_fwnode_get_name,
54};
55EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
56
57/**
58 * __irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
59 * identifying an irq domain
60 * @type: Type of irqchip_fwnode. See linux/irqdomain.h
61 * @id: Optional user provided id if name != NULL
62 * @name: Optional user provided domain name
63 * @pa: Optional user-provided physical address
64 *
65 * Allocate a struct irqchip_fwid, and return a pointer to the embedded
66 * fwnode_handle (or NULL on failure).
67 *
68 * Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
69 * solely to transport name information to irqdomain creation code. The
70 * node is not stored. For other types the pointer is kept in the irq
71 * domain struct.
72 */
73struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
74 const char *name,
75 phys_addr_t *pa)
76{
77 struct irqchip_fwid *fwid;
78 char *n;
79
80 fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
81
82 switch (type) {
83 case IRQCHIP_FWNODE_NAMED:
84 n = kasprintf(GFP_KERNEL, "%s", name);
85 break;
86 case IRQCHIP_FWNODE_NAMED_ID:
87 n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
88 break;
89 default:
90 n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
91 break;
92 }
93
94 if (!fwid || !n) {
95 kfree(fwid);
96 kfree(n);
97 return NULL;
98 }
99
100 fwid->type = type;
101 fwid->name = n;
102 fwid->pa = pa;
103 fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
104 return &fwid->fwnode;
105}
106EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
107
108/**
109 * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
110 *
111 * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
112 */
113void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
114{
115 struct irqchip_fwid *fwid;
116
117 if (WARN_ON(!is_fwnode_irqchip(fwnode)))
118 return;
119
120 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
121 kfree(fwid->name);
122 kfree(fwid);
123}
124EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
125
126/**
127 * __irq_domain_add() - Allocate a new irq_domain data structure
128 * @fwnode: firmware node for the interrupt controller
129 * @size: Size of linear map; 0 for radix mapping only
130 * @hwirq_max: Maximum number of interrupts supported by controller
131 * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
132 * direct mapping
133 * @ops: domain callbacks
134 * @host_data: Controller private data pointer
135 *
136 * Allocates and initializes an irq_domain structure.
137 * Returns pointer to IRQ domain, or NULL on failure.
138 */
139struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
140 irq_hw_number_t hwirq_max, int direct_max,
141 const struct irq_domain_ops *ops,
142 void *host_data)
143{
144 struct irqchip_fwid *fwid;
145 struct irq_domain *domain;
146
147 static atomic_t unknown_domains;
148
149 if (WARN_ON((size && direct_max) ||
150 (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max)))
151 return NULL;
152
153 domain = kzalloc_node(struct_size(domain, revmap, size),
154 GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
155 if (!domain)
156 return NULL;
157
158 if (is_fwnode_irqchip(fwnode)) {
159 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
160
161 switch (fwid->type) {
162 case IRQCHIP_FWNODE_NAMED:
163 case IRQCHIP_FWNODE_NAMED_ID:
164 domain->fwnode = fwnode;
165 domain->name = kstrdup(fwid->name, GFP_KERNEL);
166 if (!domain->name) {
167 kfree(domain);
168 return NULL;
169 }
170 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
171 break;
172 default:
173 domain->fwnode = fwnode;
174 domain->name = fwid->name;
175 break;
176 }
177 } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
178 is_software_node(fwnode)) {
179 char *name;
180
181 /*
182 * fwnode paths contain '/', which debugfs is legitimately
183 * unhappy about. Replace them with ':', which does
184 * the trick and is not as offensive as '\'...
185 */
186 name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
187 if (!name) {
188 kfree(domain);
189 return NULL;
190 }
191
192 strreplace(name, '/', ':');
193
194 domain->name = name;
195 domain->fwnode = fwnode;
196 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
197 }
198
199 if (!domain->name) {
200 if (fwnode)
201 pr_err("Invalid fwnode type for irqdomain\n");
202 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
203 atomic_inc_return(&unknown_domains));
204 if (!domain->name) {
205 kfree(domain);
206 return NULL;
207 }
208 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
209 }
210
211 fwnode_handle_get(fwnode);
212 fwnode_dev_initialized(fwnode, true);
213
214 /* Fill structure */
215 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
216 mutex_init(&domain->revmap_mutex);
217 domain->ops = ops;
218 domain->host_data = host_data;
219 domain->hwirq_max = hwirq_max;
220
221 if (direct_max) {
222 size = direct_max;
223 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
224 }
225
226 domain->revmap_size = size;
227
228 irq_domain_check_hierarchy(domain);
229
230 mutex_lock(&irq_domain_mutex);
231 debugfs_add_domain_dir(domain);
232 list_add(&domain->link, &irq_domain_list);
233 mutex_unlock(&irq_domain_mutex);
234
235 pr_debug("Added domain %s\n", domain->name);
236 return domain;
237}
238EXPORT_SYMBOL_GPL(__irq_domain_add);
239
240/**
241 * irq_domain_remove() - Remove an irq domain.
242 * @domain: domain to remove
243 *
244 * This routine is used to remove an irq domain. The caller must ensure
245 * that all mappings within the domain have been disposed of prior to
246 * use, depending on the revmap type.
247 */
248void irq_domain_remove(struct irq_domain *domain)
249{
250 mutex_lock(&irq_domain_mutex);
251 debugfs_remove_domain_dir(domain);
252
253 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
254
255 list_del(&domain->link);
256
257 /*
258 * If the going away domain is the default one, reset it.
259 */
260 if (unlikely(irq_default_domain == domain))
261 irq_set_default_host(NULL);
262
263 mutex_unlock(&irq_domain_mutex);
264
265 pr_debug("Removed domain %s\n", domain->name);
266
267 fwnode_dev_initialized(domain->fwnode, false);
268 fwnode_handle_put(domain->fwnode);
269 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
270 kfree(domain->name);
271 kfree(domain);
272}
273EXPORT_SYMBOL_GPL(irq_domain_remove);
274
275void irq_domain_update_bus_token(struct irq_domain *domain,
276 enum irq_domain_bus_token bus_token)
277{
278 char *name;
279
280 if (domain->bus_token == bus_token)
281 return;
282
283 mutex_lock(&irq_domain_mutex);
284
285 domain->bus_token = bus_token;
286
287 name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
288 if (!name) {
289 mutex_unlock(&irq_domain_mutex);
290 return;
291 }
292
293 debugfs_remove_domain_dir(domain);
294
295 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
296 kfree(domain->name);
297 else
298 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
299
300 domain->name = name;
301 debugfs_add_domain_dir(domain);
302
303 mutex_unlock(&irq_domain_mutex);
304}
305EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
306
307/**
308 * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
309 * @fwnode: firmware node for the interrupt controller
310 * @size: total number of irqs in mapping
311 * @first_irq: first number of irq block assigned to the domain,
312 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
313 * pre-map all of the irqs in the domain to virqs starting at first_irq.
314 * @ops: domain callbacks
315 * @host_data: Controller private data pointer
316 *
317 * Allocates an irq_domain, and optionally if first_irq is positive then also
318 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
319 *
320 * This is intended to implement the expected behaviour for most
321 * interrupt controllers. If device tree is used, then first_irq will be 0 and
322 * irqs get mapped dynamically on the fly. However, if the controller requires
323 * static virq assignments (non-DT boot) then it will set that up correctly.
324 */
325struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
326 unsigned int size,
327 unsigned int first_irq,
328 const struct irq_domain_ops *ops,
329 void *host_data)
330{
331 struct irq_domain *domain;
332
333 domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data);
334 if (!domain)
335 return NULL;
336
337 if (first_irq > 0) {
338 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
339 /* attempt to allocated irq_descs */
340 int rc = irq_alloc_descs(first_irq, first_irq, size,
341 of_node_to_nid(to_of_node(fwnode)));
342 if (rc < 0)
343 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
344 first_irq);
345 }
346 irq_domain_associate_many(domain, first_irq, 0, size);
347 }
348
349 return domain;
350}
351EXPORT_SYMBOL_GPL(irq_domain_create_simple);
352
353/**
354 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
355 * @of_node: pointer to interrupt controller's device tree node.
356 * @size: total number of irqs in legacy mapping
357 * @first_irq: first number of irq block assigned to the domain
358 * @first_hwirq: first hwirq number to use for the translation. Should normally
359 * be '0', but a positive integer can be used if the effective
360 * hwirqs numbering does not begin at zero.
361 * @ops: map/unmap domain callbacks
362 * @host_data: Controller private data pointer
363 *
364 * Note: the map() callback will be called before this function returns
365 * for all legacy interrupts except 0 (which is always the invalid irq for
366 * a legacy controller).
367 */
368struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
369 unsigned int size,
370 unsigned int first_irq,
371 irq_hw_number_t first_hwirq,
372 const struct irq_domain_ops *ops,
373 void *host_data)
374{
375 return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
376 first_irq, first_hwirq, ops, host_data);
377}
378EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
379
380struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
381 unsigned int size,
382 unsigned int first_irq,
383 irq_hw_number_t first_hwirq,
384 const struct irq_domain_ops *ops,
385 void *host_data)
386{
387 struct irq_domain *domain;
388
389 domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
390 if (domain)
391 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
392
393 return domain;
394}
395EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
396
397/**
398 * irq_find_matching_fwspec() - Locates a domain for a given fwspec
399 * @fwspec: FW specifier for an interrupt
400 * @bus_token: domain-specific data
401 */
402struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
403 enum irq_domain_bus_token bus_token)
404{
405 struct irq_domain *h, *found = NULL;
406 struct fwnode_handle *fwnode = fwspec->fwnode;
407 int rc;
408
409 /* We might want to match the legacy controller last since
410 * it might potentially be set to match all interrupts in
411 * the absence of a device node. This isn't a problem so far
412 * yet though...
413 *
414 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
415 * values must generate an exact match for the domain to be
416 * selected.
417 */
418 mutex_lock(&irq_domain_mutex);
419 list_for_each_entry(h, &irq_domain_list, link) {
420 if (h->ops->select && fwspec->param_count)
421 rc = h->ops->select(h, fwspec, bus_token);
422 else if (h->ops->match)
423 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
424 else
425 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
426 ((bus_token == DOMAIN_BUS_ANY) ||
427 (h->bus_token == bus_token)));
428
429 if (rc) {
430 found = h;
431 break;
432 }
433 }
434 mutex_unlock(&irq_domain_mutex);
435 return found;
436}
437EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
438
439/**
440 * irq_domain_check_msi_remap - Check whether all MSI irq domains implement
441 * IRQ remapping
442 *
443 * Return: false if any MSI irq domain does not support IRQ remapping,
444 * true otherwise (including if there is no MSI irq domain)
445 */
446bool irq_domain_check_msi_remap(void)
447{
448 struct irq_domain *h;
449 bool ret = true;
450
451 mutex_lock(&irq_domain_mutex);
452 list_for_each_entry(h, &irq_domain_list, link) {
453 if (irq_domain_is_msi(h) &&
454 !irq_domain_hierarchical_is_msi_remap(h)) {
455 ret = false;
456 break;
457 }
458 }
459 mutex_unlock(&irq_domain_mutex);
460 return ret;
461}
462EXPORT_SYMBOL_GPL(irq_domain_check_msi_remap);
463
464/**
465 * irq_set_default_host() - Set a "default" irq domain
466 * @domain: default domain pointer
467 *
468 * For convenience, it's possible to set a "default" domain that will be used
469 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
470 * platforms that want to manipulate a few hard coded interrupt numbers that
471 * aren't properly represented in the device-tree.
472 */
473void irq_set_default_host(struct irq_domain *domain)
474{
475 pr_debug("Default domain set to @0x%p\n", domain);
476
477 irq_default_domain = domain;
478}
479EXPORT_SYMBOL_GPL(irq_set_default_host);
480
481/**
482 * irq_get_default_host() - Retrieve the "default" irq domain
483 *
484 * Returns: the default domain, if any.
485 *
486 * Modern code should never use this. This should only be used on
487 * systems that cannot implement a firmware->fwnode mapping (which
488 * both DT and ACPI provide).
489 */
490struct irq_domain *irq_get_default_host(void)
491{
492 return irq_default_domain;
493}
494
495static bool irq_domain_is_nomap(struct irq_domain *domain)
496{
497 return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
498 (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
499}
500
501static void irq_domain_clear_mapping(struct irq_domain *domain,
502 irq_hw_number_t hwirq)
503{
504 if (irq_domain_is_nomap(domain))
505 return;
506
507 mutex_lock(&domain->revmap_mutex);
508 if (hwirq < domain->revmap_size)
509 rcu_assign_pointer(domain->revmap[hwirq], NULL);
510 else
511 radix_tree_delete(&domain->revmap_tree, hwirq);
512 mutex_unlock(&domain->revmap_mutex);
513}
514
515static void irq_domain_set_mapping(struct irq_domain *domain,
516 irq_hw_number_t hwirq,
517 struct irq_data *irq_data)
518{
519 if (irq_domain_is_nomap(domain))
520 return;
521
522 mutex_lock(&domain->revmap_mutex);
523 if (hwirq < domain->revmap_size)
524 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
525 else
526 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
527 mutex_unlock(&domain->revmap_mutex);
528}
529
530static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
531{
532 struct irq_data *irq_data = irq_get_irq_data(irq);
533 irq_hw_number_t hwirq;
534
535 if (WARN(!irq_data || irq_data->domain != domain,
536 "virq%i doesn't exist; cannot disassociate\n", irq))
537 return;
538
539 hwirq = irq_data->hwirq;
540 irq_set_status_flags(irq, IRQ_NOREQUEST);
541
542 /* remove chip and handler */
543 irq_set_chip_and_handler(irq, NULL, NULL);
544
545 /* Make sure it's completed */
546 synchronize_irq(irq);
547
548 /* Tell the PIC about it */
549 if (domain->ops->unmap)
550 domain->ops->unmap(domain, irq);
551 smp_mb();
552
553 irq_data->domain = NULL;
554 irq_data->hwirq = 0;
555 domain->mapcount--;
556
557 /* Clear reverse map for this hwirq */
558 irq_domain_clear_mapping(domain, hwirq);
559}
560
561int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
562 irq_hw_number_t hwirq)
563{
564 struct irq_data *irq_data = irq_get_irq_data(virq);
565 int ret;
566
567 if (WARN(hwirq >= domain->hwirq_max,
568 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
569 return -EINVAL;
570 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
571 return -EINVAL;
572 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
573 return -EINVAL;
574
575 mutex_lock(&irq_domain_mutex);
576 irq_data->hwirq = hwirq;
577 irq_data->domain = domain;
578 if (domain->ops->map) {
579 ret = domain->ops->map(domain, virq, hwirq);
580 if (ret != 0) {
581 /*
582 * If map() returns -EPERM, this interrupt is protected
583 * by the firmware or some other service and shall not
584 * be mapped. Don't bother telling the user about it.
585 */
586 if (ret != -EPERM) {
587 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
588 domain->name, hwirq, virq, ret);
589 }
590 irq_data->domain = NULL;
591 irq_data->hwirq = 0;
592 mutex_unlock(&irq_domain_mutex);
593 return ret;
594 }
595
596 /* If not already assigned, give the domain the chip's name */
597 if (!domain->name && irq_data->chip)
598 domain->name = irq_data->chip->name;
599 }
600
601 domain->mapcount++;
602 irq_domain_set_mapping(domain, hwirq, irq_data);
603 mutex_unlock(&irq_domain_mutex);
604
605 irq_clear_status_flags(virq, IRQ_NOREQUEST);
606
607 return 0;
608}
609EXPORT_SYMBOL_GPL(irq_domain_associate);
610
611void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
612 irq_hw_number_t hwirq_base, int count)
613{
614 struct device_node *of_node;
615 int i;
616
617 of_node = irq_domain_get_of_node(domain);
618 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
619 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
620
621 for (i = 0; i < count; i++) {
622 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
623 }
624}
625EXPORT_SYMBOL_GPL(irq_domain_associate_many);
626
627#ifdef CONFIG_IRQ_DOMAIN_NOMAP
628/**
629 * irq_create_direct_mapping() - Allocate an irq for direct mapping
630 * @domain: domain to allocate the irq for or NULL for default domain
631 *
632 * This routine is used for irq controllers which can choose the hardware
633 * interrupt numbers they generate. In such a case it's simplest to use
634 * the linux irq as the hardware interrupt number. It still uses the linear
635 * or radix tree to store the mapping, but the irq controller can optimize
636 * the revmap path by using the hwirq directly.
637 */
638unsigned int irq_create_direct_mapping(struct irq_domain *domain)
639{
640 struct device_node *of_node;
641 unsigned int virq;
642
643 if (domain == NULL)
644 domain = irq_default_domain;
645
646 of_node = irq_domain_get_of_node(domain);
647 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
648 if (!virq) {
649 pr_debug("create_direct virq allocation failed\n");
650 return 0;
651 }
652 if (virq >= domain->revmap_size) {
653 pr_err("ERROR: no free irqs available below %i maximum\n",
654 domain->revmap_size);
655 irq_free_desc(virq);
656 return 0;
657 }
658 pr_debug("create_direct obtained virq %d\n", virq);
659
660 if (irq_domain_associate(domain, virq, virq)) {
661 irq_free_desc(virq);
662 return 0;
663 }
664
665 return virq;
666}
667EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
668#endif
669
670/**
671 * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
672 * @domain: domain owning this hardware interrupt or NULL for default domain
673 * @hwirq: hardware irq number in that domain space
674 * @affinity: irq affinity
675 *
676 * Only one mapping per hardware interrupt is permitted. Returns a linux
677 * irq number.
678 * If the sense/trigger is to be specified, set_irq_type() should be called
679 * on the number returned from that call.
680 */
681unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
682 irq_hw_number_t hwirq,
683 const struct irq_affinity_desc *affinity)
684{
685 struct device_node *of_node;
686 int virq;
687
688 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
689
690 /* Look for default domain if necessary */
691 if (domain == NULL)
692 domain = irq_default_domain;
693 if (domain == NULL) {
694 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
695 return 0;
696 }
697 pr_debug("-> using domain @%p\n", domain);
698
699 of_node = irq_domain_get_of_node(domain);
700
701 /* Check if mapping already exists */
702 virq = irq_find_mapping(domain, hwirq);
703 if (virq) {
704 pr_debug("-> existing mapping on virq %d\n", virq);
705 return virq;
706 }
707
708 /* Allocate a virtual interrupt number */
709 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
710 affinity);
711 if (virq <= 0) {
712 pr_debug("-> virq allocation failed\n");
713 return 0;
714 }
715
716 if (irq_domain_associate(domain, virq, hwirq)) {
717 irq_free_desc(virq);
718 return 0;
719 }
720
721 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
722 hwirq, of_node_full_name(of_node), virq);
723
724 return virq;
725}
726EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
727
728static int irq_domain_translate(struct irq_domain *d,
729 struct irq_fwspec *fwspec,
730 irq_hw_number_t *hwirq, unsigned int *type)
731{
732#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
733 if (d->ops->translate)
734 return d->ops->translate(d, fwspec, hwirq, type);
735#endif
736 if (d->ops->xlate)
737 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
738 fwspec->param, fwspec->param_count,
739 hwirq, type);
740
741 /* If domain has no translation, then we assume interrupt line */
742 *hwirq = fwspec->param[0];
743 return 0;
744}
745
746static void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
747 unsigned int count,
748 struct irq_fwspec *fwspec)
749{
750 int i;
751
752 fwspec->fwnode = of_node_to_fwnode(np);
753 fwspec->param_count = count;
754
755 for (i = 0; i < count; i++)
756 fwspec->param[i] = args[i];
757}
758
759unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
760{
761 struct irq_domain *domain;
762 struct irq_data *irq_data;
763 irq_hw_number_t hwirq;
764 unsigned int type = IRQ_TYPE_NONE;
765 int virq;
766
767 if (fwspec->fwnode) {
768 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
769 if (!domain)
770 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
771 } else {
772 domain = irq_default_domain;
773 }
774
775 if (!domain) {
776 pr_warn("no irq domain found for %s !\n",
777 of_node_full_name(to_of_node(fwspec->fwnode)));
778 return 0;
779 }
780
781 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
782 return 0;
783
784 /*
785 * WARN if the irqchip returns a type with bits
786 * outside the sense mask set and clear these bits.
787 */
788 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
789 type &= IRQ_TYPE_SENSE_MASK;
790
791 /*
792 * If we've already configured this interrupt,
793 * don't do it again, or hell will break loose.
794 */
795 virq = irq_find_mapping(domain, hwirq);
796 if (virq) {
797 /*
798 * If the trigger type is not specified or matches the
799 * current trigger type then we are done so return the
800 * interrupt number.
801 */
802 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
803 return virq;
804
805 /*
806 * If the trigger type has not been set yet, then set
807 * it now and return the interrupt number.
808 */
809 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
810 irq_data = irq_get_irq_data(virq);
811 if (!irq_data)
812 return 0;
813
814 irqd_set_trigger_type(irq_data, type);
815 return virq;
816 }
817
818 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
819 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
820 return 0;
821 }
822
823 if (irq_domain_is_hierarchy(domain)) {
824 virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
825 if (virq <= 0)
826 return 0;
827 } else {
828 /* Create mapping */
829 virq = irq_create_mapping(domain, hwirq);
830 if (!virq)
831 return virq;
832 }
833
834 irq_data = irq_get_irq_data(virq);
835 if (!irq_data) {
836 if (irq_domain_is_hierarchy(domain))
837 irq_domain_free_irqs(virq, 1);
838 else
839 irq_dispose_mapping(virq);
840 return 0;
841 }
842
843 /* Store trigger type */
844 irqd_set_trigger_type(irq_data, type);
845
846 return virq;
847}
848EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
849
850unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
851{
852 struct irq_fwspec fwspec;
853
854 of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
855 irq_data->args_count, &fwspec);
856
857 return irq_create_fwspec_mapping(&fwspec);
858}
859EXPORT_SYMBOL_GPL(irq_create_of_mapping);
860
861/**
862 * irq_dispose_mapping() - Unmap an interrupt
863 * @virq: linux irq number of the interrupt to unmap
864 */
865void irq_dispose_mapping(unsigned int virq)
866{
867 struct irq_data *irq_data = irq_get_irq_data(virq);
868 struct irq_domain *domain;
869
870 if (!virq || !irq_data)
871 return;
872
873 domain = irq_data->domain;
874 if (WARN_ON(domain == NULL))
875 return;
876
877 if (irq_domain_is_hierarchy(domain)) {
878 irq_domain_free_irqs(virq, 1);
879 } else {
880 irq_domain_disassociate(domain, virq);
881 irq_free_desc(virq);
882 }
883}
884EXPORT_SYMBOL_GPL(irq_dispose_mapping);
885
886/**
887 * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
888 * @domain: domain owning this hardware interrupt
889 * @hwirq: hardware irq number in that domain space
890 * @irq: optional pointer to return the Linux irq if required
891 *
892 * Returns the interrupt descriptor.
893 */
894struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
895 irq_hw_number_t hwirq,
896 unsigned int *irq)
897{
898 struct irq_desc *desc = NULL;
899 struct irq_data *data;
900
901 /* Look for default domain if necessary */
902 if (domain == NULL)
903 domain = irq_default_domain;
904 if (domain == NULL)
905 return desc;
906
907 if (irq_domain_is_nomap(domain)) {
908 if (hwirq < domain->revmap_size) {
909 data = irq_domain_get_irq_data(domain, hwirq);
910 if (data && data->hwirq == hwirq)
911 desc = irq_data_to_desc(data);
912 }
913
914 return desc;
915 }
916
917 rcu_read_lock();
918 /* Check if the hwirq is in the linear revmap. */
919 if (hwirq < domain->revmap_size)
920 data = rcu_dereference(domain->revmap[hwirq]);
921 else
922 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
923
924 if (likely(data)) {
925 desc = irq_data_to_desc(data);
926 if (irq)
927 *irq = data->irq;
928 }
929
930 rcu_read_unlock();
931 return desc;
932}
933EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
934
935/**
936 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
937 *
938 * Device Tree IRQ specifier translation function which works with one cell
939 * bindings where the cell value maps directly to the hwirq number.
940 */
941int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
942 const u32 *intspec, unsigned int intsize,
943 unsigned long *out_hwirq, unsigned int *out_type)
944{
945 if (WARN_ON(intsize < 1))
946 return -EINVAL;
947 *out_hwirq = intspec[0];
948 *out_type = IRQ_TYPE_NONE;
949 return 0;
950}
951EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
952
953/**
954 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
955 *
956 * Device Tree IRQ specifier translation function which works with two cell
957 * bindings where the cell values map directly to the hwirq number
958 * and linux irq flags.
959 */
960int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
961 const u32 *intspec, unsigned int intsize,
962 irq_hw_number_t *out_hwirq, unsigned int *out_type)
963{
964 struct irq_fwspec fwspec;
965
966 of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
967 return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
968}
969EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
970
971/**
972 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
973 *
974 * Device Tree IRQ specifier translation function which works with either one
975 * or two cell bindings where the cell values map directly to the hwirq number
976 * and linux irq flags.
977 *
978 * Note: don't use this function unless your interrupt controller explicitly
979 * supports both one and two cell bindings. For the majority of controllers
980 * the _onecell() or _twocell() variants above should be used.
981 */
982int irq_domain_xlate_onetwocell(struct irq_domain *d,
983 struct device_node *ctrlr,
984 const u32 *intspec, unsigned int intsize,
985 unsigned long *out_hwirq, unsigned int *out_type)
986{
987 if (WARN_ON(intsize < 1))
988 return -EINVAL;
989 *out_hwirq = intspec[0];
990 if (intsize > 1)
991 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
992 else
993 *out_type = IRQ_TYPE_NONE;
994 return 0;
995}
996EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
997
998const struct irq_domain_ops irq_domain_simple_ops = {
999 .xlate = irq_domain_xlate_onetwocell,
1000};
1001EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1002
1003/**
1004 * irq_domain_translate_onecell() - Generic translate for direct one cell
1005 * bindings
1006 */
1007int irq_domain_translate_onecell(struct irq_domain *d,
1008 struct irq_fwspec *fwspec,
1009 unsigned long *out_hwirq,
1010 unsigned int *out_type)
1011{
1012 if (WARN_ON(fwspec->param_count < 1))
1013 return -EINVAL;
1014 *out_hwirq = fwspec->param[0];
1015 *out_type = IRQ_TYPE_NONE;
1016 return 0;
1017}
1018EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1019
1020/**
1021 * irq_domain_translate_twocell() - Generic translate for direct two cell
1022 * bindings
1023 *
1024 * Device Tree IRQ specifier translation function which works with two cell
1025 * bindings where the cell values map directly to the hwirq number
1026 * and linux irq flags.
1027 */
1028int irq_domain_translate_twocell(struct irq_domain *d,
1029 struct irq_fwspec *fwspec,
1030 unsigned long *out_hwirq,
1031 unsigned int *out_type)
1032{
1033 if (WARN_ON(fwspec->param_count < 2))
1034 return -EINVAL;
1035 *out_hwirq = fwspec->param[0];
1036 *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1037 return 0;
1038}
1039EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1040
1041int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1042 int node, const struct irq_affinity_desc *affinity)
1043{
1044 unsigned int hint;
1045
1046 if (virq >= 0) {
1047 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1048 affinity);
1049 } else {
1050 hint = hwirq % nr_irqs;
1051 if (hint == 0)
1052 hint++;
1053 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1054 affinity);
1055 if (virq <= 0 && hint > 1) {
1056 virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1057 affinity);
1058 }
1059 }
1060
1061 return virq;
1062}
1063
1064/**
1065 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1066 * @irq_data: The pointer to irq_data
1067 */
1068void irq_domain_reset_irq_data(struct irq_data *irq_data)
1069{
1070 irq_data->hwirq = 0;
1071 irq_data->chip = &no_irq_chip;
1072 irq_data->chip_data = NULL;
1073}
1074EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1075
1076#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1077/**
1078 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1079 * @parent: Parent irq domain to associate with the new domain
1080 * @flags: Irq domain flags associated to the domain
1081 * @size: Size of the domain. See below
1082 * @fwnode: Optional fwnode of the interrupt controller
1083 * @ops: Pointer to the interrupt domain callbacks
1084 * @host_data: Controller private data pointer
1085 *
1086 * If @size is 0 a tree domain is created, otherwise a linear domain.
1087 *
1088 * If successful the parent is associated to the new domain and the
1089 * domain flags are set.
1090 * Returns pointer to IRQ domain, or NULL on failure.
1091 */
1092struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1093 unsigned int flags,
1094 unsigned int size,
1095 struct fwnode_handle *fwnode,
1096 const struct irq_domain_ops *ops,
1097 void *host_data)
1098{
1099 struct irq_domain *domain;
1100
1101 if (size)
1102 domain = irq_domain_create_linear(fwnode, size, ops, host_data);
1103 else
1104 domain = irq_domain_create_tree(fwnode, ops, host_data);
1105 if (domain) {
1106 domain->parent = parent;
1107 domain->flags |= flags;
1108 }
1109
1110 return domain;
1111}
1112EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1113
1114static void irq_domain_insert_irq(int virq)
1115{
1116 struct irq_data *data;
1117
1118 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1119 struct irq_domain *domain = data->domain;
1120
1121 domain->mapcount++;
1122 irq_domain_set_mapping(domain, data->hwirq, data);
1123
1124 /* If not already assigned, give the domain the chip's name */
1125 if (!domain->name && data->chip)
1126 domain->name = data->chip->name;
1127 }
1128
1129 irq_clear_status_flags(virq, IRQ_NOREQUEST);
1130}
1131
1132static void irq_domain_remove_irq(int virq)
1133{
1134 struct irq_data *data;
1135
1136 irq_set_status_flags(virq, IRQ_NOREQUEST);
1137 irq_set_chip_and_handler(virq, NULL, NULL);
1138 synchronize_irq(virq);
1139 smp_mb();
1140
1141 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1142 struct irq_domain *domain = data->domain;
1143 irq_hw_number_t hwirq = data->hwirq;
1144
1145 domain->mapcount--;
1146 irq_domain_clear_mapping(domain, hwirq);
1147 }
1148}
1149
1150static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1151 struct irq_data *child)
1152{
1153 struct irq_data *irq_data;
1154
1155 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1156 irq_data_get_node(child));
1157 if (irq_data) {
1158 child->parent_data = irq_data;
1159 irq_data->irq = child->irq;
1160 irq_data->common = child->common;
1161 irq_data->domain = domain;
1162 }
1163
1164 return irq_data;
1165}
1166
1167static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1168{
1169 struct irq_data *tmp;
1170
1171 while (irq_data) {
1172 tmp = irq_data;
1173 irq_data = irq_data->parent_data;
1174 kfree(tmp);
1175 }
1176}
1177
1178static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1179{
1180 struct irq_data *irq_data, *tmp;
1181 int i;
1182
1183 for (i = 0; i < nr_irqs; i++) {
1184 irq_data = irq_get_irq_data(virq + i);
1185 tmp = irq_data->parent_data;
1186 irq_data->parent_data = NULL;
1187 irq_data->domain = NULL;
1188
1189 __irq_domain_free_hierarchy(tmp);
1190 }
1191}
1192
1193/**
1194 * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1195 * @domain: IRQ domain from which the hierarchy is to be disconnected
1196 * @virq: IRQ number where the hierarchy is to be trimmed
1197 *
1198 * Marks the @virq level belonging to @domain as disconnected.
1199 * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1200 * to @domain.
1201 *
1202 * Its only use is to be able to trim levels of hierarchy that do not
1203 * have any real meaning for this interrupt, and that the driver marks
1204 * as such from its .alloc() callback.
1205 */
1206int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1207 unsigned int virq)
1208{
1209 struct irq_data *irqd;
1210
1211 irqd = irq_domain_get_irq_data(domain, virq);
1212 if (!irqd)
1213 return -EINVAL;
1214
1215 irqd->chip = ERR_PTR(-ENOTCONN);
1216 return 0;
1217}
1218
1219static int irq_domain_trim_hierarchy(unsigned int virq)
1220{
1221 struct irq_data *tail, *irqd, *irq_data;
1222
1223 irq_data = irq_get_irq_data(virq);
1224 tail = NULL;
1225
1226 /* The first entry must have a valid irqchip */
1227 if (!irq_data->chip || IS_ERR(irq_data->chip))
1228 return -EINVAL;
1229
1230 /*
1231 * Validate that the irq_data chain is sane in the presence of
1232 * a hierarchy trimming marker.
1233 */
1234 for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1235 /* Can't have a valid irqchip after a trim marker */
1236 if (irqd->chip && tail)
1237 return -EINVAL;
1238
1239 /* Can't have an empty irqchip before a trim marker */
1240 if (!irqd->chip && !tail)
1241 return -EINVAL;
1242
1243 if (IS_ERR(irqd->chip)) {
1244 /* Only -ENOTCONN is a valid trim marker */
1245 if (PTR_ERR(irqd->chip) != -ENOTCONN)
1246 return -EINVAL;
1247
1248 tail = irq_data;
1249 }
1250 }
1251
1252 /* No trim marker, nothing to do */
1253 if (!tail)
1254 return 0;
1255
1256 pr_info("IRQ%d: trimming hierarchy from %s\n",
1257 virq, tail->parent_data->domain->name);
1258
1259 /* Sever the inner part of the hierarchy... */
1260 irqd = tail;
1261 tail = tail->parent_data;
1262 irqd->parent_data = NULL;
1263 __irq_domain_free_hierarchy(tail);
1264
1265 return 0;
1266}
1267
1268static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1269 unsigned int virq, unsigned int nr_irqs)
1270{
1271 struct irq_data *irq_data;
1272 struct irq_domain *parent;
1273 int i;
1274
1275 /* The outermost irq_data is embedded in struct irq_desc */
1276 for (i = 0; i < nr_irqs; i++) {
1277 irq_data = irq_get_irq_data(virq + i);
1278 irq_data->domain = domain;
1279
1280 for (parent = domain->parent; parent; parent = parent->parent) {
1281 irq_data = irq_domain_insert_irq_data(parent, irq_data);
1282 if (!irq_data) {
1283 irq_domain_free_irq_data(virq, i + 1);
1284 return -ENOMEM;
1285 }
1286 }
1287 }
1288
1289 return 0;
1290}
1291
1292/**
1293 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1294 * @domain: domain to match
1295 * @virq: IRQ number to get irq_data
1296 */
1297struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1298 unsigned int virq)
1299{
1300 struct irq_data *irq_data;
1301
1302 for (irq_data = irq_get_irq_data(virq); irq_data;
1303 irq_data = irq_data->parent_data)
1304 if (irq_data->domain == domain)
1305 return irq_data;
1306
1307 return NULL;
1308}
1309EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1310
1311/**
1312 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1313 * @domain: Interrupt domain to match
1314 * @virq: IRQ number
1315 * @hwirq: The hwirq number
1316 * @chip: The associated interrupt chip
1317 * @chip_data: The associated chip data
1318 */
1319int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1320 irq_hw_number_t hwirq, struct irq_chip *chip,
1321 void *chip_data)
1322{
1323 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1324
1325 if (!irq_data)
1326 return -ENOENT;
1327
1328 irq_data->hwirq = hwirq;
1329 irq_data->chip = chip ? chip : &no_irq_chip;
1330 irq_data->chip_data = chip_data;
1331
1332 return 0;
1333}
1334EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1335
1336/**
1337 * irq_domain_set_info - Set the complete data for a @virq in @domain
1338 * @domain: Interrupt domain to match
1339 * @virq: IRQ number
1340 * @hwirq: The hardware interrupt number
1341 * @chip: The associated interrupt chip
1342 * @chip_data: The associated interrupt chip data
1343 * @handler: The interrupt flow handler
1344 * @handler_data: The interrupt flow handler data
1345 * @handler_name: The interrupt handler name
1346 */
1347void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1348 irq_hw_number_t hwirq, struct irq_chip *chip,
1349 void *chip_data, irq_flow_handler_t handler,
1350 void *handler_data, const char *handler_name)
1351{
1352 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1353 __irq_set_handler(virq, handler, 0, handler_name);
1354 irq_set_handler_data(virq, handler_data);
1355}
1356EXPORT_SYMBOL(irq_domain_set_info);
1357
1358/**
1359 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1360 * @domain: Interrupt domain to match
1361 * @virq: IRQ number to start with
1362 * @nr_irqs: The number of irqs to free
1363 */
1364void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1365 unsigned int nr_irqs)
1366{
1367 struct irq_data *irq_data;
1368 int i;
1369
1370 for (i = 0; i < nr_irqs; i++) {
1371 irq_data = irq_domain_get_irq_data(domain, virq + i);
1372 if (irq_data)
1373 irq_domain_reset_irq_data(irq_data);
1374 }
1375 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1376}
1377EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1378
1379/**
1380 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1381 * @domain: Interrupt domain to match
1382 * @virq: IRQ number to start with
1383 * @nr_irqs: The number of irqs to free
1384 */
1385void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1386 unsigned int nr_irqs)
1387{
1388 int i;
1389
1390 for (i = 0; i < nr_irqs; i++) {
1391 irq_set_handler_data(virq + i, NULL);
1392 irq_set_handler(virq + i, NULL);
1393 }
1394 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1395}
1396
1397static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1398 unsigned int irq_base,
1399 unsigned int nr_irqs)
1400{
1401 unsigned int i;
1402
1403 if (!domain->ops->free)
1404 return;
1405
1406 for (i = 0; i < nr_irqs; i++) {
1407 if (irq_domain_get_irq_data(domain, irq_base + i))
1408 domain->ops->free(domain, irq_base + i, 1);
1409 }
1410}
1411
1412int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1413 unsigned int irq_base,
1414 unsigned int nr_irqs, void *arg)
1415{
1416 if (!domain->ops->alloc) {
1417 pr_debug("domain->ops->alloc() is NULL\n");
1418 return -ENOSYS;
1419 }
1420
1421 return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1422}
1423
1424/**
1425 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1426 * @domain: domain to allocate from
1427 * @irq_base: allocate specified IRQ number if irq_base >= 0
1428 * @nr_irqs: number of IRQs to allocate
1429 * @node: NUMA node id for memory allocation
1430 * @arg: domain specific argument
1431 * @realloc: IRQ descriptors have already been allocated if true
1432 * @affinity: Optional irq affinity mask for multiqueue devices
1433 *
1434 * Allocate IRQ numbers and initialized all data structures to support
1435 * hierarchy IRQ domains.
1436 * Parameter @realloc is mainly to support legacy IRQs.
1437 * Returns error code or allocated IRQ number
1438 *
1439 * The whole process to setup an IRQ has been split into two steps.
1440 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1441 * descriptor and required hardware resources. The second step,
1442 * irq_domain_activate_irq(), is to program the hardware with preallocated
1443 * resources. In this way, it's easier to rollback when failing to
1444 * allocate resources.
1445 */
1446int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1447 unsigned int nr_irqs, int node, void *arg,
1448 bool realloc, const struct irq_affinity_desc *affinity)
1449{
1450 int i, ret, virq;
1451
1452 if (domain == NULL) {
1453 domain = irq_default_domain;
1454 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1455 return -EINVAL;
1456 }
1457
1458 if (realloc && irq_base >= 0) {
1459 virq = irq_base;
1460 } else {
1461 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1462 affinity);
1463 if (virq < 0) {
1464 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1465 irq_base, nr_irqs);
1466 return virq;
1467 }
1468 }
1469
1470 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1471 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1472 ret = -ENOMEM;
1473 goto out_free_desc;
1474 }
1475
1476 mutex_lock(&irq_domain_mutex);
1477 ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1478 if (ret < 0) {
1479 mutex_unlock(&irq_domain_mutex);
1480 goto out_free_irq_data;
1481 }
1482
1483 for (i = 0; i < nr_irqs; i++) {
1484 ret = irq_domain_trim_hierarchy(virq + i);
1485 if (ret) {
1486 mutex_unlock(&irq_domain_mutex);
1487 goto out_free_irq_data;
1488 }
1489 }
1490
1491 for (i = 0; i < nr_irqs; i++)
1492 irq_domain_insert_irq(virq + i);
1493 mutex_unlock(&irq_domain_mutex);
1494
1495 return virq;
1496
1497out_free_irq_data:
1498 irq_domain_free_irq_data(virq, nr_irqs);
1499out_free_desc:
1500 irq_free_descs(virq, nr_irqs);
1501 return ret;
1502}
1503
1504/* The irq_data was moved, fix the revmap to refer to the new location */
1505static void irq_domain_fix_revmap(struct irq_data *d)
1506{
1507 void __rcu **slot;
1508
1509 if (irq_domain_is_nomap(d->domain))
1510 return;
1511
1512 /* Fix up the revmap. */
1513 mutex_lock(&d->domain->revmap_mutex);
1514 if (d->hwirq < d->domain->revmap_size) {
1515 /* Not using radix tree */
1516 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1517 } else {
1518 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1519 if (slot)
1520 radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1521 }
1522 mutex_unlock(&d->domain->revmap_mutex);
1523}
1524
1525/**
1526 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1527 * @domain: Domain to push.
1528 * @virq: Irq to push the domain in to.
1529 * @arg: Passed to the irq_domain_ops alloc() function.
1530 *
1531 * For an already existing irqdomain hierarchy, as might be obtained
1532 * via a call to pci_enable_msix(), add an additional domain to the
1533 * head of the processing chain. Must be called before request_irq()
1534 * has been called.
1535 */
1536int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1537{
1538 struct irq_data *child_irq_data;
1539 struct irq_data *root_irq_data = irq_get_irq_data(virq);
1540 struct irq_desc *desc;
1541 int rv = 0;
1542
1543 /*
1544 * Check that no action has been set, which indicates the virq
1545 * is in a state where this function doesn't have to deal with
1546 * races between interrupt handling and maintaining the
1547 * hierarchy. This will catch gross misuse. Attempting to
1548 * make the check race free would require holding locks across
1549 * calls to struct irq_domain_ops->alloc(), which could lead
1550 * to deadlock, so we just do a simple check before starting.
1551 */
1552 desc = irq_to_desc(virq);
1553 if (!desc)
1554 return -EINVAL;
1555 if (WARN_ON(desc->action))
1556 return -EBUSY;
1557
1558 if (domain == NULL)
1559 return -EINVAL;
1560
1561 if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1562 return -EINVAL;
1563
1564 if (!root_irq_data)
1565 return -EINVAL;
1566
1567 if (domain->parent != root_irq_data->domain)
1568 return -EINVAL;
1569
1570 child_irq_data = kzalloc_node(sizeof(*child_irq_data), GFP_KERNEL,
1571 irq_data_get_node(root_irq_data));
1572 if (!child_irq_data)
1573 return -ENOMEM;
1574
1575 mutex_lock(&irq_domain_mutex);
1576
1577 /* Copy the original irq_data. */
1578 *child_irq_data = *root_irq_data;
1579
1580 /*
1581 * Overwrite the root_irq_data, which is embedded in struct
1582 * irq_desc, with values for this domain.
1583 */
1584 root_irq_data->parent_data = child_irq_data;
1585 root_irq_data->domain = domain;
1586 root_irq_data->mask = 0;
1587 root_irq_data->hwirq = 0;
1588 root_irq_data->chip = NULL;
1589 root_irq_data->chip_data = NULL;
1590
1591 /* May (probably does) set hwirq, chip, etc. */
1592 rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1593 if (rv) {
1594 /* Restore the original irq_data. */
1595 *root_irq_data = *child_irq_data;
1596 kfree(child_irq_data);
1597 goto error;
1598 }
1599
1600 irq_domain_fix_revmap(child_irq_data);
1601 irq_domain_set_mapping(domain, root_irq_data->hwirq, root_irq_data);
1602
1603error:
1604 mutex_unlock(&irq_domain_mutex);
1605
1606 return rv;
1607}
1608EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1609
1610/**
1611 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1612 * @domain: Domain to remove.
1613 * @virq: Irq to remove the domain from.
1614 *
1615 * Undo the effects of a call to irq_domain_push_irq(). Must be
1616 * called either before request_irq() or after free_irq().
1617 */
1618int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1619{
1620 struct irq_data *root_irq_data = irq_get_irq_data(virq);
1621 struct irq_data *child_irq_data;
1622 struct irq_data *tmp_irq_data;
1623 struct irq_desc *desc;
1624
1625 /*
1626 * Check that no action is set, which indicates the virq is in
1627 * a state where this function doesn't have to deal with races
1628 * between interrupt handling and maintaining the hierarchy.
1629 * This will catch gross misuse. Attempting to make the check
1630 * race free would require holding locks across calls to
1631 * struct irq_domain_ops->free(), which could lead to
1632 * deadlock, so we just do a simple check before starting.
1633 */
1634 desc = irq_to_desc(virq);
1635 if (!desc)
1636 return -EINVAL;
1637 if (WARN_ON(desc->action))
1638 return -EBUSY;
1639
1640 if (domain == NULL)
1641 return -EINVAL;
1642
1643 if (!root_irq_data)
1644 return -EINVAL;
1645
1646 tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1647
1648 /* We can only "pop" if this domain is at the top of the list */
1649 if (WARN_ON(root_irq_data != tmp_irq_data))
1650 return -EINVAL;
1651
1652 if (WARN_ON(root_irq_data->domain != domain))
1653 return -EINVAL;
1654
1655 child_irq_data = root_irq_data->parent_data;
1656 if (WARN_ON(!child_irq_data))
1657 return -EINVAL;
1658
1659 mutex_lock(&irq_domain_mutex);
1660
1661 root_irq_data->parent_data = NULL;
1662
1663 irq_domain_clear_mapping(domain, root_irq_data->hwirq);
1664 irq_domain_free_irqs_hierarchy(domain, virq, 1);
1665
1666 /* Restore the original irq_data. */
1667 *root_irq_data = *child_irq_data;
1668
1669 irq_domain_fix_revmap(root_irq_data);
1670
1671 mutex_unlock(&irq_domain_mutex);
1672
1673 kfree(child_irq_data);
1674
1675 return 0;
1676}
1677EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1678
1679/**
1680 * irq_domain_free_irqs - Free IRQ number and associated data structures
1681 * @virq: base IRQ number
1682 * @nr_irqs: number of IRQs to free
1683 */
1684void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1685{
1686 struct irq_data *data = irq_get_irq_data(virq);
1687 int i;
1688
1689 if (WARN(!data || !data->domain || !data->domain->ops->free,
1690 "NULL pointer, cannot free irq\n"))
1691 return;
1692
1693 mutex_lock(&irq_domain_mutex);
1694 for (i = 0; i < nr_irqs; i++)
1695 irq_domain_remove_irq(virq + i);
1696 irq_domain_free_irqs_hierarchy(data->domain, virq, nr_irqs);
1697 mutex_unlock(&irq_domain_mutex);
1698
1699 irq_domain_free_irq_data(virq, nr_irqs);
1700 irq_free_descs(virq, nr_irqs);
1701}
1702
1703/**
1704 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1705 * @domain: Domain below which interrupts must be allocated
1706 * @irq_base: Base IRQ number
1707 * @nr_irqs: Number of IRQs to allocate
1708 * @arg: Allocation data (arch/domain specific)
1709 */
1710int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1711 unsigned int irq_base, unsigned int nr_irqs,
1712 void *arg)
1713{
1714 if (!domain->parent)
1715 return -ENOSYS;
1716
1717 return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1718 nr_irqs, arg);
1719}
1720EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1721
1722/**
1723 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1724 * @domain: Domain below which interrupts must be freed
1725 * @irq_base: Base IRQ number
1726 * @nr_irqs: Number of IRQs to free
1727 */
1728void irq_domain_free_irqs_parent(struct irq_domain *domain,
1729 unsigned int irq_base, unsigned int nr_irqs)
1730{
1731 if (!domain->parent)
1732 return;
1733
1734 irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1735}
1736EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1737
1738static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1739{
1740 if (irq_data && irq_data->domain) {
1741 struct irq_domain *domain = irq_data->domain;
1742
1743 if (domain->ops->deactivate)
1744 domain->ops->deactivate(domain, irq_data);
1745 if (irq_data->parent_data)
1746 __irq_domain_deactivate_irq(irq_data->parent_data);
1747 }
1748}
1749
1750static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1751{
1752 int ret = 0;
1753
1754 if (irqd && irqd->domain) {
1755 struct irq_domain *domain = irqd->domain;
1756
1757 if (irqd->parent_data)
1758 ret = __irq_domain_activate_irq(irqd->parent_data,
1759 reserve);
1760 if (!ret && domain->ops->activate) {
1761 ret = domain->ops->activate(domain, irqd, reserve);
1762 /* Rollback in case of error */
1763 if (ret && irqd->parent_data)
1764 __irq_domain_deactivate_irq(irqd->parent_data);
1765 }
1766 }
1767 return ret;
1768}
1769
1770/**
1771 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1772 * interrupt
1773 * @irq_data: Outermost irq_data associated with interrupt
1774 * @reserve: If set only reserve an interrupt vector instead of assigning one
1775 *
1776 * This is the second step to call domain_ops->activate to program interrupt
1777 * controllers, so the interrupt could actually get delivered.
1778 */
1779int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1780{
1781 int ret = 0;
1782
1783 if (!irqd_is_activated(irq_data))
1784 ret = __irq_domain_activate_irq(irq_data, reserve);
1785 if (!ret)
1786 irqd_set_activated(irq_data);
1787 return ret;
1788}
1789
1790/**
1791 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1792 * deactivate interrupt
1793 * @irq_data: outermost irq_data associated with interrupt
1794 *
1795 * It calls domain_ops->deactivate to program interrupt controllers to disable
1796 * interrupt delivery.
1797 */
1798void irq_domain_deactivate_irq(struct irq_data *irq_data)
1799{
1800 if (irqd_is_activated(irq_data)) {
1801 __irq_domain_deactivate_irq(irq_data);
1802 irqd_clr_activated(irq_data);
1803 }
1804}
1805
1806static void irq_domain_check_hierarchy(struct irq_domain *domain)
1807{
1808 /* Hierarchy irq_domains must implement callback alloc() */
1809 if (domain->ops->alloc)
1810 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1811}
1812
1813/**
1814 * irq_domain_hierarchical_is_msi_remap - Check if the domain or any
1815 * parent has MSI remapping support
1816 * @domain: domain pointer
1817 */
1818bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
1819{
1820 for (; domain; domain = domain->parent) {
1821 if (irq_domain_is_msi_remap(domain))
1822 return true;
1823 }
1824 return false;
1825}
1826#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1827/**
1828 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1829 * @domain: domain to match
1830 * @virq: IRQ number to get irq_data
1831 */
1832struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1833 unsigned int virq)
1834{
1835 struct irq_data *irq_data = irq_get_irq_data(virq);
1836
1837 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1838}
1839EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1840
1841/**
1842 * irq_domain_set_info - Set the complete data for a @virq in @domain
1843 * @domain: Interrupt domain to match
1844 * @virq: IRQ number
1845 * @hwirq: The hardware interrupt number
1846 * @chip: The associated interrupt chip
1847 * @chip_data: The associated interrupt chip data
1848 * @handler: The interrupt flow handler
1849 * @handler_data: The interrupt flow handler data
1850 * @handler_name: The interrupt handler name
1851 */
1852void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1853 irq_hw_number_t hwirq, struct irq_chip *chip,
1854 void *chip_data, irq_flow_handler_t handler,
1855 void *handler_data, const char *handler_name)
1856{
1857 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1858 irq_set_chip_data(virq, chip_data);
1859 irq_set_handler_data(virq, handler_data);
1860}
1861
1862static void irq_domain_check_hierarchy(struct irq_domain *domain)
1863{
1864}
1865#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1866
1867#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1868static struct dentry *domain_dir;
1869
1870static void
1871irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1872{
1873 seq_printf(m, "%*sname: %s\n", ind, "", d->name);
1874 seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size);
1875 seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1876 seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
1877 if (d->ops && d->ops->debug_show)
1878 d->ops->debug_show(m, d, NULL, ind + 1);
1879#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1880 if (!d->parent)
1881 return;
1882 seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1883 irq_domain_debug_show_one(m, d->parent, ind + 4);
1884#endif
1885}
1886
1887static int irq_domain_debug_show(struct seq_file *m, void *p)
1888{
1889 struct irq_domain *d = m->private;
1890
1891 /* Default domain? Might be NULL */
1892 if (!d) {
1893 if (!irq_default_domain)
1894 return 0;
1895 d = irq_default_domain;
1896 }
1897 irq_domain_debug_show_one(m, d, 0);
1898 return 0;
1899}
1900DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1901
1902static void debugfs_add_domain_dir(struct irq_domain *d)
1903{
1904 if (!d->name || !domain_dir)
1905 return;
1906 debugfs_create_file(d->name, 0444, domain_dir, d,
1907 &irq_domain_debug_fops);
1908}
1909
1910static void debugfs_remove_domain_dir(struct irq_domain *d)
1911{
1912 debugfs_remove(debugfs_lookup(d->name, domain_dir));
1913}
1914
1915void __init irq_domain_debugfs_init(struct dentry *root)
1916{
1917 struct irq_domain *d;
1918
1919 domain_dir = debugfs_create_dir("domains", root);
1920
1921 debugfs_create_file("default", 0444, domain_dir, NULL,
1922 &irq_domain_debug_fops);
1923 mutex_lock(&irq_domain_mutex);
1924 list_for_each_entry(d, &irq_domain_list, link)
1925 debugfs_add_domain_dir(d);
1926 mutex_unlock(&irq_domain_mutex);
1927}
1928#endif