1#define pr_fmt(fmt) "irq: " fmt
2
3#include <linux/acpi.h>
4#include <linux/debugfs.h>
5#include <linux/hardirq.h>
6#include <linux/interrupt.h>
7#include <linux/irq.h>
8#include <linux/irqdesc.h>
9#include <linux/irqdomain.h>
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/of.h>
13#include <linux/of_address.h>
14#include <linux/of_irq.h>
15#include <linux/topology.h>
16#include <linux/seq_file.h>
17#include <linux/slab.h>
18#include <linux/smp.h>
19#include <linux/fs.h>
20
21static LIST_HEAD(irq_domain_list);
22static DEFINE_MUTEX(irq_domain_mutex);
23
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 unsigned int type;
31 char *name;
32 void *data;
33};
34
35#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
36static void debugfs_add_domain_dir(struct irq_domain *d);
37static void debugfs_remove_domain_dir(struct irq_domain *d);
38#else
39static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
40static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
41#endif
42
43const struct fwnode_operations irqchip_fwnode_ops;
44EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
45
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61
62struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
63 const char *name, void *data)
64{
65 struct irqchip_fwid *fwid;
66 char *n;
67
68 fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
69
70 switch (type) {
71 case IRQCHIP_FWNODE_NAMED:
72 n = kasprintf(GFP_KERNEL, "%s", name);
73 break;
74 case IRQCHIP_FWNODE_NAMED_ID:
75 n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
76 break;
77 default:
78 n = kasprintf(GFP_KERNEL, "irqchip@%p", data);
79 break;
80 }
81
82 if (!fwid || !n) {
83 kfree(fwid);
84 kfree(n);
85 return NULL;
86 }
87
88 fwid->type = type;
89 fwid->name = n;
90 fwid->data = data;
91 fwid->fwnode.ops = &irqchip_fwnode_ops;
92 return &fwid->fwnode;
93}
94EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
95
96
97
98
99
100
101void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
102{
103 struct irqchip_fwid *fwid;
104
105 if (WARN_ON(!is_fwnode_irqchip(fwnode)))
106 return;
107
108 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
109 kfree(fwid->name);
110 kfree(fwid);
111}
112EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
113
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126
127struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
128 irq_hw_number_t hwirq_max, int direct_max,
129 const struct irq_domain_ops *ops,
130 void *host_data)
131{
132 struct device_node *of_node = to_of_node(fwnode);
133 struct irqchip_fwid *fwid;
134 struct irq_domain *domain;
135
136 static atomic_t unknown_domains;
137
138 domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
139 GFP_KERNEL, of_node_to_nid(of_node));
140 if (WARN_ON(!domain))
141 return NULL;
142
143 if (fwnode && is_fwnode_irqchip(fwnode)) {
144 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
145
146 switch (fwid->type) {
147 case IRQCHIP_FWNODE_NAMED:
148 case IRQCHIP_FWNODE_NAMED_ID:
149 domain->name = kstrdup(fwid->name, GFP_KERNEL);
150 if (!domain->name) {
151 kfree(domain);
152 return NULL;
153 }
154 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
155 break;
156 default:
157 domain->fwnode = fwnode;
158 domain->name = fwid->name;
159 break;
160 }
161#ifdef CONFIG_ACPI
162 } else if (is_acpi_device_node(fwnode)) {
163 struct acpi_buffer buf = {
164 .length = ACPI_ALLOCATE_BUFFER,
165 };
166 acpi_handle handle;
167
168 handle = acpi_device_handle(to_acpi_device_node(fwnode));
169 if (acpi_get_name(handle, ACPI_FULL_PATHNAME, &buf) == AE_OK) {
170 domain->name = buf.pointer;
171 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
172 }
173
174 domain->fwnode = fwnode;
175#endif
176 } else if (of_node) {
177 char *name;
178
179
180
181
182
183
184 name = kstrdup(of_node_full_name(of_node), GFP_KERNEL);
185 if (!name) {
186 kfree(domain);
187 return NULL;
188 }
189
190 strreplace(name, '/', ':');
191
192 domain->name = name;
193 domain->fwnode = fwnode;
194 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
195 }
196
197 if (!domain->name) {
198 if (fwnode)
199 pr_err("Invalid fwnode type for irqdomain\n");
200 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
201 atomic_inc_return(&unknown_domains));
202 if (!domain->name) {
203 kfree(domain);
204 return NULL;
205 }
206 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
207 }
208
209 of_node_get(of_node);
210
211
212 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
213 mutex_init(&domain->revmap_tree_mutex);
214 domain->ops = ops;
215 domain->host_data = host_data;
216 domain->hwirq_max = hwirq_max;
217 domain->revmap_size = size;
218 domain->revmap_direct_max_irq = direct_max;
219 irq_domain_check_hierarchy(domain);
220
221 mutex_lock(&irq_domain_mutex);
222 debugfs_add_domain_dir(domain);
223 list_add(&domain->link, &irq_domain_list);
224 mutex_unlock(&irq_domain_mutex);
225
226 pr_debug("Added domain %s\n", domain->name);
227 return domain;
228}
229EXPORT_SYMBOL_GPL(__irq_domain_add);
230
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237
238
239void irq_domain_remove(struct irq_domain *domain)
240{
241 mutex_lock(&irq_domain_mutex);
242 debugfs_remove_domain_dir(domain);
243
244 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
245
246 list_del(&domain->link);
247
248
249
250
251 if (unlikely(irq_default_domain == domain))
252 irq_set_default_host(NULL);
253
254 mutex_unlock(&irq_domain_mutex);
255
256 pr_debug("Removed domain %s\n", domain->name);
257
258 of_node_put(irq_domain_get_of_node(domain));
259 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
260 kfree(domain->name);
261 kfree(domain);
262}
263EXPORT_SYMBOL_GPL(irq_domain_remove);
264
265void irq_domain_update_bus_token(struct irq_domain *domain,
266 enum irq_domain_bus_token bus_token)
267{
268 char *name;
269
270 if (domain->bus_token == bus_token)
271 return;
272
273 mutex_lock(&irq_domain_mutex);
274
275 domain->bus_token = bus_token;
276
277 name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
278 if (!name) {
279 mutex_unlock(&irq_domain_mutex);
280 return;
281 }
282
283 debugfs_remove_domain_dir(domain);
284
285 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
286 kfree(domain->name);
287 else
288 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
289
290 domain->name = name;
291 debugfs_add_domain_dir(domain);
292
293 mutex_unlock(&irq_domain_mutex);
294}
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313
314struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
315 unsigned int size,
316 unsigned int first_irq,
317 const struct irq_domain_ops *ops,
318 void *host_data)
319{
320 struct irq_domain *domain;
321
322 domain = __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
323 if (!domain)
324 return NULL;
325
326 if (first_irq > 0) {
327 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
328
329 int rc = irq_alloc_descs(first_irq, first_irq, size,
330 of_node_to_nid(of_node));
331 if (rc < 0)
332 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
333 first_irq);
334 }
335 irq_domain_associate_many(domain, first_irq, 0, size);
336 }
337
338 return domain;
339}
340EXPORT_SYMBOL_GPL(irq_domain_add_simple);
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357struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
358 unsigned int size,
359 unsigned int first_irq,
360 irq_hw_number_t first_hwirq,
361 const struct irq_domain_ops *ops,
362 void *host_data)
363{
364 struct irq_domain *domain;
365
366 domain = __irq_domain_add(of_node_to_fwnode(of_node), first_hwirq + size,
367 first_hwirq + size, 0, ops, host_data);
368 if (domain)
369 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
370
371 return domain;
372}
373EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
374
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379
380struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
381 enum irq_domain_bus_token bus_token)
382{
383 struct irq_domain *h, *found = NULL;
384 struct fwnode_handle *fwnode = fwspec->fwnode;
385 int rc;
386
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395
396 mutex_lock(&irq_domain_mutex);
397 list_for_each_entry(h, &irq_domain_list, link) {
398 if (h->ops->select && fwspec->param_count)
399 rc = h->ops->select(h, fwspec, bus_token);
400 else if (h->ops->match)
401 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
402 else
403 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
404 ((bus_token == DOMAIN_BUS_ANY) ||
405 (h->bus_token == bus_token)));
406
407 if (rc) {
408 found = h;
409 break;
410 }
411 }
412 mutex_unlock(&irq_domain_mutex);
413 return found;
414}
415EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
416
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423
424bool irq_domain_check_msi_remap(void)
425{
426 struct irq_domain *h;
427 bool ret = true;
428
429 mutex_lock(&irq_domain_mutex);
430 list_for_each_entry(h, &irq_domain_list, link) {
431 if (irq_domain_is_msi(h) &&
432 !irq_domain_hierarchical_is_msi_remap(h)) {
433 ret = false;
434 break;
435 }
436 }
437 mutex_unlock(&irq_domain_mutex);
438 return ret;
439}
440EXPORT_SYMBOL_GPL(irq_domain_check_msi_remap);
441
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450
451void irq_set_default_host(struct irq_domain *domain)
452{
453 pr_debug("Default domain set to @0x%p\n", domain);
454
455 irq_default_domain = domain;
456}
457EXPORT_SYMBOL_GPL(irq_set_default_host);
458
459static void irq_domain_clear_mapping(struct irq_domain *domain,
460 irq_hw_number_t hwirq)
461{
462 if (hwirq < domain->revmap_size) {
463 domain->linear_revmap[hwirq] = 0;
464 } else {
465 mutex_lock(&domain->revmap_tree_mutex);
466 radix_tree_delete(&domain->revmap_tree, hwirq);
467 mutex_unlock(&domain->revmap_tree_mutex);
468 }
469}
470
471static void irq_domain_set_mapping(struct irq_domain *domain,
472 irq_hw_number_t hwirq,
473 struct irq_data *irq_data)
474{
475 if (hwirq < domain->revmap_size) {
476 domain->linear_revmap[hwirq] = irq_data->irq;
477 } else {
478 mutex_lock(&domain->revmap_tree_mutex);
479 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
480 mutex_unlock(&domain->revmap_tree_mutex);
481 }
482}
483
484void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
485{
486 struct irq_data *irq_data = irq_get_irq_data(irq);
487 irq_hw_number_t hwirq;
488
489 if (WARN(!irq_data || irq_data->domain != domain,
490 "virq%i doesn't exist; cannot disassociate\n", irq))
491 return;
492
493 hwirq = irq_data->hwirq;
494 irq_set_status_flags(irq, IRQ_NOREQUEST);
495
496
497 irq_set_chip_and_handler(irq, NULL, NULL);
498
499
500 synchronize_irq(irq);
501
502
503 if (domain->ops->unmap)
504 domain->ops->unmap(domain, irq);
505 smp_mb();
506
507 irq_data->domain = NULL;
508 irq_data->hwirq = 0;
509 domain->mapcount--;
510
511
512 irq_domain_clear_mapping(domain, hwirq);
513}
514
515int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
516 irq_hw_number_t hwirq)
517{
518 struct irq_data *irq_data = irq_get_irq_data(virq);
519 int ret;
520
521 if (WARN(hwirq >= domain->hwirq_max,
522 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
523 return -EINVAL;
524 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
525 return -EINVAL;
526 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
527 return -EINVAL;
528
529 mutex_lock(&irq_domain_mutex);
530 irq_data->hwirq = hwirq;
531 irq_data->domain = domain;
532 if (domain->ops->map) {
533 ret = domain->ops->map(domain, virq, hwirq);
534 if (ret != 0) {
535
536
537
538
539
540 if (ret != -EPERM) {
541 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
542 domain->name, hwirq, virq, ret);
543 }
544 irq_data->domain = NULL;
545 irq_data->hwirq = 0;
546 mutex_unlock(&irq_domain_mutex);
547 return ret;
548 }
549
550
551 if (!domain->name && irq_data->chip)
552 domain->name = irq_data->chip->name;
553 }
554
555 domain->mapcount++;
556 irq_domain_set_mapping(domain, hwirq, irq_data);
557 mutex_unlock(&irq_domain_mutex);
558
559 irq_clear_status_flags(virq, IRQ_NOREQUEST);
560
561 return 0;
562}
563EXPORT_SYMBOL_GPL(irq_domain_associate);
564
565void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
566 irq_hw_number_t hwirq_base, int count)
567{
568 struct device_node *of_node;
569 int i;
570
571 of_node = irq_domain_get_of_node(domain);
572 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
573 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
574
575 for (i = 0; i < count; i++) {
576 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
577 }
578}
579EXPORT_SYMBOL_GPL(irq_domain_associate_many);
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590
591unsigned int irq_create_direct_mapping(struct irq_domain *domain)
592{
593 struct device_node *of_node;
594 unsigned int virq;
595
596 if (domain == NULL)
597 domain = irq_default_domain;
598
599 of_node = irq_domain_get_of_node(domain);
600 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
601 if (!virq) {
602 pr_debug("create_direct virq allocation failed\n");
603 return 0;
604 }
605 if (virq >= domain->revmap_direct_max_irq) {
606 pr_err("ERROR: no free irqs available below %i maximum\n",
607 domain->revmap_direct_max_irq);
608 irq_free_desc(virq);
609 return 0;
610 }
611 pr_debug("create_direct obtained virq %d\n", virq);
612
613 if (irq_domain_associate(domain, virq, virq)) {
614 irq_free_desc(virq);
615 return 0;
616 }
617
618 return virq;
619}
620EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
621
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630
631
632unsigned int irq_create_mapping(struct irq_domain *domain,
633 irq_hw_number_t hwirq)
634{
635 struct device_node *of_node;
636 int virq;
637
638 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
639
640
641 if (domain == NULL)
642 domain = irq_default_domain;
643 if (domain == NULL) {
644 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
645 return 0;
646 }
647 pr_debug("-> using domain @%p\n", domain);
648
649 of_node = irq_domain_get_of_node(domain);
650
651
652 virq = irq_find_mapping(domain, hwirq);
653 if (virq) {
654 pr_debug("-> existing mapping on virq %d\n", virq);
655 return virq;
656 }
657
658
659 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), NULL);
660 if (virq <= 0) {
661 pr_debug("-> virq allocation failed\n");
662 return 0;
663 }
664
665 if (irq_domain_associate(domain, virq, hwirq)) {
666 irq_free_desc(virq);
667 return 0;
668 }
669
670 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
671 hwirq, of_node_full_name(of_node), virq);
672
673 return virq;
674}
675EXPORT_SYMBOL_GPL(irq_create_mapping);
676
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695int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
696 irq_hw_number_t hwirq_base, int count)
697{
698 struct device_node *of_node;
699 int ret;
700
701 of_node = irq_domain_get_of_node(domain);
702 ret = irq_alloc_descs(irq_base, irq_base, count,
703 of_node_to_nid(of_node));
704 if (unlikely(ret < 0))
705 return ret;
706
707 irq_domain_associate_many(domain, irq_base, hwirq_base, count);
708 return 0;
709}
710EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
711
712static int irq_domain_translate(struct irq_domain *d,
713 struct irq_fwspec *fwspec,
714 irq_hw_number_t *hwirq, unsigned int *type)
715{
716#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
717 if (d->ops->translate)
718 return d->ops->translate(d, fwspec, hwirq, type);
719#endif
720 if (d->ops->xlate)
721 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
722 fwspec->param, fwspec->param_count,
723 hwirq, type);
724
725
726 *hwirq = fwspec->param[0];
727 return 0;
728}
729
730static void of_phandle_args_to_fwspec(struct of_phandle_args *irq_data,
731 struct irq_fwspec *fwspec)
732{
733 int i;
734
735 fwspec->fwnode = irq_data->np ? &irq_data->np->fwnode : NULL;
736 fwspec->param_count = irq_data->args_count;
737
738 for (i = 0; i < irq_data->args_count; i++)
739 fwspec->param[i] = irq_data->args[i];
740}
741
742unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
743{
744 struct irq_domain *domain;
745 struct irq_data *irq_data;
746 irq_hw_number_t hwirq;
747 unsigned int type = IRQ_TYPE_NONE;
748 int virq;
749
750 if (fwspec->fwnode) {
751 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
752 if (!domain)
753 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
754 } else {
755 domain = irq_default_domain;
756 }
757
758 if (!domain) {
759 pr_warn("no irq domain found for %s !\n",
760 of_node_full_name(to_of_node(fwspec->fwnode)));
761 return 0;
762 }
763
764 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
765 return 0;
766
767
768
769
770
771 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
772 type &= IRQ_TYPE_SENSE_MASK;
773
774
775
776
777
778 virq = irq_find_mapping(domain, hwirq);
779 if (virq) {
780
781
782
783
784
785 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
786 return virq;
787
788
789
790
791
792 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
793 irq_data = irq_get_irq_data(virq);
794 if (!irq_data)
795 return 0;
796
797 irqd_set_trigger_type(irq_data, type);
798 return virq;
799 }
800
801 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
802 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
803 return 0;
804 }
805
806 if (irq_domain_is_hierarchy(domain)) {
807 virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
808 if (virq <= 0)
809 return 0;
810 } else {
811
812 virq = irq_create_mapping(domain, hwirq);
813 if (!virq)
814 return virq;
815 }
816
817 irq_data = irq_get_irq_data(virq);
818 if (!irq_data) {
819 if (irq_domain_is_hierarchy(domain))
820 irq_domain_free_irqs(virq, 1);
821 else
822 irq_dispose_mapping(virq);
823 return 0;
824 }
825
826
827 irqd_set_trigger_type(irq_data, type);
828
829 return virq;
830}
831EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
832
833unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
834{
835 struct irq_fwspec fwspec;
836
837 of_phandle_args_to_fwspec(irq_data, &fwspec);
838 return irq_create_fwspec_mapping(&fwspec);
839}
840EXPORT_SYMBOL_GPL(irq_create_of_mapping);
841
842
843
844
845
846void irq_dispose_mapping(unsigned int virq)
847{
848 struct irq_data *irq_data = irq_get_irq_data(virq);
849 struct irq_domain *domain;
850
851 if (!virq || !irq_data)
852 return;
853
854 domain = irq_data->domain;
855 if (WARN_ON(domain == NULL))
856 return;
857
858 if (irq_domain_is_hierarchy(domain)) {
859 irq_domain_free_irqs(virq, 1);
860 } else {
861 irq_domain_disassociate(domain, virq);
862 irq_free_desc(virq);
863 }
864}
865EXPORT_SYMBOL_GPL(irq_dispose_mapping);
866
867
868
869
870
871
872unsigned int irq_find_mapping(struct irq_domain *domain,
873 irq_hw_number_t hwirq)
874{
875 struct irq_data *data;
876
877
878 if (domain == NULL)
879 domain = irq_default_domain;
880 if (domain == NULL)
881 return 0;
882
883 if (hwirq < domain->revmap_direct_max_irq) {
884 data = irq_domain_get_irq_data(domain, hwirq);
885 if (data && data->hwirq == hwirq)
886 return hwirq;
887 }
888
889
890 if (hwirq < domain->revmap_size)
891 return domain->linear_revmap[hwirq];
892
893 rcu_read_lock();
894 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
895 rcu_read_unlock();
896 return data ? data->irq : 0;
897}
898EXPORT_SYMBOL_GPL(irq_find_mapping);
899
900
901
902
903
904
905
906int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
907 const u32 *intspec, unsigned int intsize,
908 unsigned long *out_hwirq, unsigned int *out_type)
909{
910 if (WARN_ON(intsize < 1))
911 return -EINVAL;
912 *out_hwirq = intspec[0];
913 *out_type = IRQ_TYPE_NONE;
914 return 0;
915}
916EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
917
918
919
920
921
922
923
924
925int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
926 const u32 *intspec, unsigned int intsize,
927 irq_hw_number_t *out_hwirq, unsigned int *out_type)
928{
929 if (WARN_ON(intsize < 2))
930 return -EINVAL;
931 *out_hwirq = intspec[0];
932 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
933 return 0;
934}
935EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
936
937
938
939
940
941
942
943
944
945
946
947
948int irq_domain_xlate_onetwocell(struct irq_domain *d,
949 struct device_node *ctrlr,
950 const u32 *intspec, unsigned int intsize,
951 unsigned long *out_hwirq, unsigned int *out_type)
952{
953 if (WARN_ON(intsize < 1))
954 return -EINVAL;
955 *out_hwirq = intspec[0];
956 if (intsize > 1)
957 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
958 else
959 *out_type = IRQ_TYPE_NONE;
960 return 0;
961}
962EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
963
964const struct irq_domain_ops irq_domain_simple_ops = {
965 .xlate = irq_domain_xlate_onetwocell,
966};
967EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
968
969int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
970 int node, const struct cpumask *affinity)
971{
972 unsigned int hint;
973
974 if (virq >= 0) {
975 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
976 affinity);
977 } else {
978 hint = hwirq % nr_irqs;
979 if (hint == 0)
980 hint++;
981 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
982 affinity);
983 if (virq <= 0 && hint > 1) {
984 virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
985 affinity);
986 }
987 }
988
989 return virq;
990}
991
992#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1009 unsigned int flags,
1010 unsigned int size,
1011 struct fwnode_handle *fwnode,
1012 const struct irq_domain_ops *ops,
1013 void *host_data)
1014{
1015 struct irq_domain *domain;
1016
1017 if (size)
1018 domain = irq_domain_create_linear(fwnode, size, ops, host_data);
1019 else
1020 domain = irq_domain_create_tree(fwnode, ops, host_data);
1021 if (domain) {
1022 domain->parent = parent;
1023 domain->flags |= flags;
1024 }
1025
1026 return domain;
1027}
1028EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1029
1030static void irq_domain_insert_irq(int virq)
1031{
1032 struct irq_data *data;
1033
1034 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1035 struct irq_domain *domain = data->domain;
1036
1037 domain->mapcount++;
1038 irq_domain_set_mapping(domain, data->hwirq, data);
1039
1040
1041 if (!domain->name && data->chip)
1042 domain->name = data->chip->name;
1043 }
1044
1045 irq_clear_status_flags(virq, IRQ_NOREQUEST);
1046}
1047
1048static void irq_domain_remove_irq(int virq)
1049{
1050 struct irq_data *data;
1051
1052 irq_set_status_flags(virq, IRQ_NOREQUEST);
1053 irq_set_chip_and_handler(virq, NULL, NULL);
1054 synchronize_irq(virq);
1055 smp_mb();
1056
1057 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1058 struct irq_domain *domain = data->domain;
1059 irq_hw_number_t hwirq = data->hwirq;
1060
1061 domain->mapcount--;
1062 irq_domain_clear_mapping(domain, hwirq);
1063 }
1064}
1065
1066static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1067 struct irq_data *child)
1068{
1069 struct irq_data *irq_data;
1070
1071 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1072 irq_data_get_node(child));
1073 if (irq_data) {
1074 child->parent_data = irq_data;
1075 irq_data->irq = child->irq;
1076 irq_data->common = child->common;
1077 irq_data->domain = domain;
1078 }
1079
1080 return irq_data;
1081}
1082
1083static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1084{
1085 struct irq_data *irq_data, *tmp;
1086 int i;
1087
1088 for (i = 0; i < nr_irqs; i++) {
1089 irq_data = irq_get_irq_data(virq + i);
1090 tmp = irq_data->parent_data;
1091 irq_data->parent_data = NULL;
1092 irq_data->domain = NULL;
1093
1094 while (tmp) {
1095 irq_data = tmp;
1096 tmp = tmp->parent_data;
1097 kfree(irq_data);
1098 }
1099 }
1100}
1101
1102static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1103 unsigned int virq, unsigned int nr_irqs)
1104{
1105 struct irq_data *irq_data;
1106 struct irq_domain *parent;
1107 int i;
1108
1109
1110 for (i = 0; i < nr_irqs; i++) {
1111 irq_data = irq_get_irq_data(virq + i);
1112 irq_data->domain = domain;
1113
1114 for (parent = domain->parent; parent; parent = parent->parent) {
1115 irq_data = irq_domain_insert_irq_data(parent, irq_data);
1116 if (!irq_data) {
1117 irq_domain_free_irq_data(virq, i + 1);
1118 return -ENOMEM;
1119 }
1120 }
1121 }
1122
1123 return 0;
1124}
1125
1126
1127
1128
1129
1130
1131struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1132 unsigned int virq)
1133{
1134 struct irq_data *irq_data;
1135
1136 for (irq_data = irq_get_irq_data(virq); irq_data;
1137 irq_data = irq_data->parent_data)
1138 if (irq_data->domain == domain)
1139 return irq_data;
1140
1141 return NULL;
1142}
1143EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1154 irq_hw_number_t hwirq, struct irq_chip *chip,
1155 void *chip_data)
1156{
1157 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1158
1159 if (!irq_data)
1160 return -ENOENT;
1161
1162 irq_data->hwirq = hwirq;
1163 irq_data->chip = chip ? chip : &no_irq_chip;
1164 irq_data->chip_data = chip_data;
1165
1166 return 0;
1167}
1168EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1182 irq_hw_number_t hwirq, struct irq_chip *chip,
1183 void *chip_data, irq_flow_handler_t handler,
1184 void *handler_data, const char *handler_name)
1185{
1186 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1187 __irq_set_handler(virq, handler, 0, handler_name);
1188 irq_set_handler_data(virq, handler_data);
1189}
1190EXPORT_SYMBOL(irq_domain_set_info);
1191
1192
1193
1194
1195
1196void irq_domain_reset_irq_data(struct irq_data *irq_data)
1197{
1198 irq_data->hwirq = 0;
1199 irq_data->chip = &no_irq_chip;
1200 irq_data->chip_data = NULL;
1201}
1202EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1203
1204
1205
1206
1207
1208
1209
1210void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1211 unsigned int nr_irqs)
1212{
1213 struct irq_data *irq_data;
1214 int i;
1215
1216 for (i = 0; i < nr_irqs; i++) {
1217 irq_data = irq_domain_get_irq_data(domain, virq + i);
1218 if (irq_data)
1219 irq_domain_reset_irq_data(irq_data);
1220 }
1221 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1222}
1223EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1224
1225
1226
1227
1228
1229
1230
1231void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1232 unsigned int nr_irqs)
1233{
1234 int i;
1235
1236 for (i = 0; i < nr_irqs; i++) {
1237 irq_set_handler_data(virq + i, NULL);
1238 irq_set_handler(virq + i, NULL);
1239 }
1240 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1241}
1242
1243static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1244 unsigned int irq_base,
1245 unsigned int nr_irqs)
1246{
1247 if (domain->ops->free)
1248 domain->ops->free(domain, irq_base, nr_irqs);
1249}
1250
1251int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1252 unsigned int irq_base,
1253 unsigned int nr_irqs, void *arg)
1254{
1255 return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1256}
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1281 unsigned int nr_irqs, int node, void *arg,
1282 bool realloc, const struct cpumask *affinity)
1283{
1284 int i, ret, virq;
1285
1286 if (domain == NULL) {
1287 domain = irq_default_domain;
1288 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1289 return -EINVAL;
1290 }
1291
1292 if (!domain->ops->alloc) {
1293 pr_debug("domain->ops->alloc() is NULL\n");
1294 return -ENOSYS;
1295 }
1296
1297 if (realloc && irq_base >= 0) {
1298 virq = irq_base;
1299 } else {
1300 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1301 affinity);
1302 if (virq < 0) {
1303 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1304 irq_base, nr_irqs);
1305 return virq;
1306 }
1307 }
1308
1309 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1310 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1311 ret = -ENOMEM;
1312 goto out_free_desc;
1313 }
1314
1315 mutex_lock(&irq_domain_mutex);
1316 ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1317 if (ret < 0) {
1318 mutex_unlock(&irq_domain_mutex);
1319 goto out_free_irq_data;
1320 }
1321 for (i = 0; i < nr_irqs; i++)
1322 irq_domain_insert_irq(virq + i);
1323 mutex_unlock(&irq_domain_mutex);
1324
1325 return virq;
1326
1327out_free_irq_data:
1328 irq_domain_free_irq_data(virq, nr_irqs);
1329out_free_desc:
1330 irq_free_descs(virq, nr_irqs);
1331 return ret;
1332}
1333
1334
1335static void irq_domain_fix_revmap(struct irq_data *d)
1336{
1337 void __rcu **slot;
1338
1339 if (d->hwirq < d->domain->revmap_size)
1340 return;
1341
1342
1343 mutex_lock(&d->domain->revmap_tree_mutex);
1344 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1345 if (slot)
1346 radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1347 mutex_unlock(&d->domain->revmap_tree_mutex);
1348}
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1362{
1363 struct irq_data *child_irq_data;
1364 struct irq_data *root_irq_data = irq_get_irq_data(virq);
1365 struct irq_desc *desc;
1366 int rv = 0;
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377 desc = irq_to_desc(virq);
1378 if (!desc)
1379 return -EINVAL;
1380 if (WARN_ON(desc->action))
1381 return -EBUSY;
1382
1383 if (domain == NULL)
1384 return -EINVAL;
1385
1386 if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1387 return -EINVAL;
1388
1389 if (!root_irq_data)
1390 return -EINVAL;
1391
1392 if (domain->parent != root_irq_data->domain)
1393 return -EINVAL;
1394
1395 child_irq_data = kzalloc_node(sizeof(*child_irq_data), GFP_KERNEL,
1396 irq_data_get_node(root_irq_data));
1397 if (!child_irq_data)
1398 return -ENOMEM;
1399
1400 mutex_lock(&irq_domain_mutex);
1401
1402
1403 *child_irq_data = *root_irq_data;
1404
1405
1406
1407
1408
1409 root_irq_data->parent_data = child_irq_data;
1410 root_irq_data->domain = domain;
1411 root_irq_data->mask = 0;
1412 root_irq_data->hwirq = 0;
1413 root_irq_data->chip = NULL;
1414 root_irq_data->chip_data = NULL;
1415
1416
1417 rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1418 if (rv) {
1419
1420 *root_irq_data = *child_irq_data;
1421 goto error;
1422 }
1423
1424 irq_domain_fix_revmap(child_irq_data);
1425 irq_domain_set_mapping(domain, root_irq_data->hwirq, root_irq_data);
1426
1427error:
1428 mutex_unlock(&irq_domain_mutex);
1429
1430 return rv;
1431}
1432EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1443{
1444 struct irq_data *root_irq_data = irq_get_irq_data(virq);
1445 struct irq_data *child_irq_data;
1446 struct irq_data *tmp_irq_data;
1447 struct irq_desc *desc;
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458 desc = irq_to_desc(virq);
1459 if (!desc)
1460 return -EINVAL;
1461 if (WARN_ON(desc->action))
1462 return -EBUSY;
1463
1464 if (domain == NULL)
1465 return -EINVAL;
1466
1467 if (!root_irq_data)
1468 return -EINVAL;
1469
1470 tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1471
1472
1473 if (WARN_ON(root_irq_data != tmp_irq_data))
1474 return -EINVAL;
1475
1476 if (WARN_ON(root_irq_data->domain != domain))
1477 return -EINVAL;
1478
1479 child_irq_data = root_irq_data->parent_data;
1480 if (WARN_ON(!child_irq_data))
1481 return -EINVAL;
1482
1483 mutex_lock(&irq_domain_mutex);
1484
1485 root_irq_data->parent_data = NULL;
1486
1487 irq_domain_clear_mapping(domain, root_irq_data->hwirq);
1488 irq_domain_free_irqs_hierarchy(domain, virq, 1);
1489
1490
1491 *root_irq_data = *child_irq_data;
1492
1493 irq_domain_fix_revmap(root_irq_data);
1494
1495 mutex_unlock(&irq_domain_mutex);
1496
1497 kfree(child_irq_data);
1498
1499 return 0;
1500}
1501EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1502
1503
1504
1505
1506
1507
1508void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1509{
1510 struct irq_data *data = irq_get_irq_data(virq);
1511 int i;
1512
1513 if (WARN(!data || !data->domain || !data->domain->ops->free,
1514 "NULL pointer, cannot free irq\n"))
1515 return;
1516
1517 mutex_lock(&irq_domain_mutex);
1518 for (i = 0; i < nr_irqs; i++)
1519 irq_domain_remove_irq(virq + i);
1520 irq_domain_free_irqs_hierarchy(data->domain, virq, nr_irqs);
1521 mutex_unlock(&irq_domain_mutex);
1522
1523 irq_domain_free_irq_data(virq, nr_irqs);
1524 irq_free_descs(virq, nr_irqs);
1525}
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1537 unsigned int irq_base, unsigned int nr_irqs,
1538 void *arg)
1539{
1540 if (!domain->parent)
1541 return -ENOSYS;
1542
1543 return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1544 nr_irqs, arg);
1545}
1546EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556void irq_domain_free_irqs_parent(struct irq_domain *domain,
1557 unsigned int irq_base, unsigned int nr_irqs)
1558{
1559 if (!domain->parent)
1560 return;
1561
1562 irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1563}
1564EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1565
1566static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1567{
1568 if (irq_data && irq_data->domain) {
1569 struct irq_domain *domain = irq_data->domain;
1570
1571 if (domain->ops->deactivate)
1572 domain->ops->deactivate(domain, irq_data);
1573 if (irq_data->parent_data)
1574 __irq_domain_deactivate_irq(irq_data->parent_data);
1575 }
1576}
1577
1578static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1579{
1580 int ret = 0;
1581
1582 if (irqd && irqd->domain) {
1583 struct irq_domain *domain = irqd->domain;
1584
1585 if (irqd->parent_data)
1586 ret = __irq_domain_activate_irq(irqd->parent_data,
1587 reserve);
1588 if (!ret && domain->ops->activate) {
1589 ret = domain->ops->activate(domain, irqd, reserve);
1590
1591 if (ret && irqd->parent_data)
1592 __irq_domain_deactivate_irq(irqd->parent_data);
1593 }
1594 }
1595 return ret;
1596}
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1608{
1609 int ret = 0;
1610
1611 if (!irqd_is_activated(irq_data))
1612 ret = __irq_domain_activate_irq(irq_data, reserve);
1613 if (!ret)
1614 irqd_set_activated(irq_data);
1615 return ret;
1616}
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626void irq_domain_deactivate_irq(struct irq_data *irq_data)
1627{
1628 if (irqd_is_activated(irq_data)) {
1629 __irq_domain_deactivate_irq(irq_data);
1630 irqd_clr_activated(irq_data);
1631 }
1632}
1633
1634static void irq_domain_check_hierarchy(struct irq_domain *domain)
1635{
1636
1637 if (domain->ops->alloc)
1638 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1639}
1640
1641
1642
1643
1644
1645
1646bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
1647{
1648 for (; domain; domain = domain->parent) {
1649 if (irq_domain_is_msi_remap(domain))
1650 return true;
1651 }
1652 return false;
1653}
1654#else
1655
1656
1657
1658
1659
1660struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1661 unsigned int virq)
1662{
1663 struct irq_data *irq_data = irq_get_irq_data(virq);
1664
1665 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1666}
1667EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1681 irq_hw_number_t hwirq, struct irq_chip *chip,
1682 void *chip_data, irq_flow_handler_t handler,
1683 void *handler_data, const char *handler_name)
1684{
1685 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1686 irq_set_chip_data(virq, chip_data);
1687 irq_set_handler_data(virq, handler_data);
1688}
1689
1690static void irq_domain_check_hierarchy(struct irq_domain *domain)
1691{
1692}
1693#endif
1694
1695#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1696static struct dentry *domain_dir;
1697
1698static void
1699irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1700{
1701 seq_printf(m, "%*sname: %s\n", ind, "", d->name);
1702 seq_printf(m, "%*ssize: %u\n", ind + 1, "",
1703 d->revmap_size + d->revmap_direct_max_irq);
1704 seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1705 seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
1706 if (d->ops && d->ops->debug_show)
1707 d->ops->debug_show(m, d, NULL, ind + 1);
1708#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1709 if (!d->parent)
1710 return;
1711 seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1712 irq_domain_debug_show_one(m, d->parent, ind + 4);
1713#endif
1714}
1715
1716static int irq_domain_debug_show(struct seq_file *m, void *p)
1717{
1718 struct irq_domain *d = m->private;
1719
1720
1721 if (!d) {
1722 if (!irq_default_domain)
1723 return 0;
1724 d = irq_default_domain;
1725 }
1726 irq_domain_debug_show_one(m, d, 0);
1727 return 0;
1728}
1729DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1730
1731static void debugfs_add_domain_dir(struct irq_domain *d)
1732{
1733 if (!d->name || !domain_dir || d->debugfs_file)
1734 return;
1735 d->debugfs_file = debugfs_create_file(d->name, 0444, domain_dir, d,
1736 &irq_domain_debug_fops);
1737}
1738
1739static void debugfs_remove_domain_dir(struct irq_domain *d)
1740{
1741 debugfs_remove(d->debugfs_file);
1742}
1743
1744void __init irq_domain_debugfs_init(struct dentry *root)
1745{
1746 struct irq_domain *d;
1747
1748 domain_dir = debugfs_create_dir("domains", root);
1749 if (!domain_dir)
1750 return;
1751
1752 debugfs_create_file("default", 0444, domain_dir, NULL,
1753 &irq_domain_debug_fops);
1754 mutex_lock(&irq_domain_mutex);
1755 list_for_each_entry(d, &irq_domain_list, link)
1756 debugfs_add_domain_dir(d);
1757 mutex_unlock(&irq_domain_mutex);
1758}
1759#endif
1760