1 // SPDX-License-Identifier: GPL-2.0
3 #define pr_fmt(fmt) "irq: " fmt
5 #include <linux/acpi.h>
6 #include <linux/debugfs.h>
7 #include <linux/hardirq.h>
8 #include <linux/interrupt.h>
10 #include <linux/irqdesc.h>
11 #include <linux/irqdomain.h>
12 #include <linux/module.h>
13 #include <linux/mutex.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>
23 static LIST_HEAD(irq_domain_list);
24 static DEFINE_MUTEX(irq_domain_mutex);
26 static struct irq_domain *irq_default_domain;
28 static void irq_domain_check_hierarchy(struct irq_domain *domain);
31 struct fwnode_handle fwnode;
37 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
38 static void debugfs_add_domain_dir(struct irq_domain *d);
39 static void debugfs_remove_domain_dir(struct irq_domain *d);
41 static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
42 static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
45 static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
47 struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
52 const struct fwnode_operations irqchip_fwnode_ops = {
53 .get_name = irqchip_fwnode_get_name,
55 EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
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
65 * Allocate a struct irqchip_fwid, and return a pointer to the embedded
66 * fwnode_handle (or NULL on failure).
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
73 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
77 struct irqchip_fwid *fwid;
80 fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
83 case IRQCHIP_FWNODE_NAMED:
84 n = kasprintf(GFP_KERNEL, "%s", name);
86 case IRQCHIP_FWNODE_NAMED_ID:
87 n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
90 n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
103 fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
104 return &fwid->fwnode;
106 EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
109 * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
111 * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
113 void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
115 struct irqchip_fwid *fwid;
117 if (WARN_ON(!is_fwnode_irqchip(fwnode)))
120 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
124 EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
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
133 * @ops: domain callbacks
134 * @host_data: Controller private data pointer
136 * Allocates and initializes an irq_domain structure.
137 * Returns pointer to IRQ domain, or NULL on failure.
139 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
140 irq_hw_number_t hwirq_max, int direct_max,
141 const struct irq_domain_ops *ops,
144 struct irqchip_fwid *fwid;
145 struct irq_domain *domain;
147 static atomic_t unknown_domains;
149 if (WARN_ON((size && direct_max) ||
150 (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max) ||
151 (direct_max && (direct_max != hwirq_max))))
154 domain = kzalloc_node(struct_size(domain, revmap, size),
155 GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
159 if (is_fwnode_irqchip(fwnode)) {
160 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
162 switch (fwid->type) {
163 case IRQCHIP_FWNODE_NAMED:
164 case IRQCHIP_FWNODE_NAMED_ID:
165 domain->fwnode = fwnode;
166 domain->name = kstrdup(fwid->name, GFP_KERNEL);
171 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
174 domain->fwnode = fwnode;
175 domain->name = fwid->name;
178 } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
179 is_software_node(fwnode)) {
183 * fwnode paths contain '/', which debugfs is legitimately
184 * unhappy about. Replace them with ':', which does
185 * the trick and is not as offensive as '\'...
187 name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
193 strreplace(name, '/', ':');
196 domain->fwnode = fwnode;
197 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
202 pr_err("Invalid fwnode type for irqdomain\n");
203 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
204 atomic_inc_return(&unknown_domains));
209 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
212 fwnode_handle_get(fwnode);
213 fwnode_dev_initialized(fwnode, true);
216 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
217 mutex_init(&domain->revmap_mutex);
219 domain->host_data = host_data;
220 domain->hwirq_max = hwirq_max;
223 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
226 domain->revmap_size = size;
228 irq_domain_check_hierarchy(domain);
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);
235 pr_debug("Added domain %s\n", domain->name);
238 EXPORT_SYMBOL_GPL(__irq_domain_add);
241 * irq_domain_remove() - Remove an irq domain.
242 * @domain: domain to remove
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.
248 void irq_domain_remove(struct irq_domain *domain)
250 mutex_lock(&irq_domain_mutex);
251 debugfs_remove_domain_dir(domain);
253 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
255 list_del(&domain->link);
258 * If the going away domain is the default one, reset it.
260 if (unlikely(irq_default_domain == domain))
261 irq_set_default_host(NULL);
263 mutex_unlock(&irq_domain_mutex);
265 pr_debug("Removed domain %s\n", domain->name);
267 fwnode_dev_initialized(domain->fwnode, false);
268 fwnode_handle_put(domain->fwnode);
269 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
273 EXPORT_SYMBOL_GPL(irq_domain_remove);
275 void irq_domain_update_bus_token(struct irq_domain *domain,
276 enum irq_domain_bus_token bus_token)
280 if (domain->bus_token == bus_token)
283 mutex_lock(&irq_domain_mutex);
285 domain->bus_token = bus_token;
287 name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
289 mutex_unlock(&irq_domain_mutex);
293 debugfs_remove_domain_dir(domain);
295 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
298 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
301 debugfs_add_domain_dir(domain);
303 mutex_unlock(&irq_domain_mutex);
305 EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
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
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.
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.
325 struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
327 unsigned int first_irq,
328 const struct irq_domain_ops *ops,
331 struct irq_domain *domain;
333 domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data);
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)));
343 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
346 irq_domain_associate_many(domain, first_irq, 0, size);
351 EXPORT_SYMBOL_GPL(irq_domain_create_simple);
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
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).
368 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
370 unsigned int first_irq,
371 irq_hw_number_t first_hwirq,
372 const struct irq_domain_ops *ops,
375 return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
376 first_irq, first_hwirq, ops, host_data);
378 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
380 struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
382 unsigned int first_irq,
383 irq_hw_number_t first_hwirq,
384 const struct irq_domain_ops *ops,
387 struct irq_domain *domain;
389 domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
391 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
395 EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
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
402 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
403 enum irq_domain_bus_token bus_token)
405 struct irq_domain *h, *found = NULL;
406 struct fwnode_handle *fwnode = fwspec->fwnode;
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
414 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
415 * values must generate an exact match for the domain to be
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);
425 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
426 ((bus_token == DOMAIN_BUS_ANY) ||
427 (h->bus_token == bus_token)));
434 mutex_unlock(&irq_domain_mutex);
437 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
440 * irq_domain_check_msi_remap - Check whether all MSI irq domains implement
443 * Return: false if any MSI irq domain does not support IRQ remapping,
444 * true otherwise (including if there is no MSI irq domain)
446 bool irq_domain_check_msi_remap(void)
448 struct irq_domain *h;
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)) {
459 mutex_unlock(&irq_domain_mutex);
462 EXPORT_SYMBOL_GPL(irq_domain_check_msi_remap);
465 * irq_set_default_host() - Set a "default" irq domain
466 * @domain: default domain pointer
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.
473 void irq_set_default_host(struct irq_domain *domain)
475 pr_debug("Default domain set to @0x%p\n", domain);
477 irq_default_domain = domain;
479 EXPORT_SYMBOL_GPL(irq_set_default_host);
482 * irq_get_default_host() - Retrieve the "default" irq domain
484 * Returns: the default domain, if any.
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).
490 struct irq_domain *irq_get_default_host(void)
492 return irq_default_domain;
494 EXPORT_SYMBOL_GPL(irq_get_default_host);
496 static bool irq_domain_is_nomap(struct irq_domain *domain)
498 return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
499 (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
502 static void irq_domain_clear_mapping(struct irq_domain *domain,
503 irq_hw_number_t hwirq)
505 if (irq_domain_is_nomap(domain))
508 mutex_lock(&domain->revmap_mutex);
509 if (hwirq < domain->revmap_size)
510 rcu_assign_pointer(domain->revmap[hwirq], NULL);
512 radix_tree_delete(&domain->revmap_tree, hwirq);
513 mutex_unlock(&domain->revmap_mutex);
516 static void irq_domain_set_mapping(struct irq_domain *domain,
517 irq_hw_number_t hwirq,
518 struct irq_data *irq_data)
520 if (irq_domain_is_nomap(domain))
523 mutex_lock(&domain->revmap_mutex);
524 if (hwirq < domain->revmap_size)
525 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
527 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
528 mutex_unlock(&domain->revmap_mutex);
531 static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
533 struct irq_data *irq_data = irq_get_irq_data(irq);
534 irq_hw_number_t hwirq;
536 if (WARN(!irq_data || irq_data->domain != domain,
537 "virq%i doesn't exist; cannot disassociate\n", irq))
540 hwirq = irq_data->hwirq;
541 irq_set_status_flags(irq, IRQ_NOREQUEST);
543 /* remove chip and handler */
544 irq_set_chip_and_handler(irq, NULL, NULL);
546 /* Make sure it's completed */
547 synchronize_irq(irq);
549 /* Tell the PIC about it */
550 if (domain->ops->unmap)
551 domain->ops->unmap(domain, irq);
554 irq_data->domain = NULL;
558 /* Clear reverse map for this hwirq */
559 irq_domain_clear_mapping(domain, hwirq);
562 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
563 irq_hw_number_t hwirq)
565 struct irq_data *irq_data = irq_get_irq_data(virq);
568 if (WARN(hwirq >= domain->hwirq_max,
569 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
571 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
573 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
576 mutex_lock(&irq_domain_mutex);
577 irq_data->hwirq = hwirq;
578 irq_data->domain = domain;
579 if (domain->ops->map) {
580 ret = domain->ops->map(domain, virq, hwirq);
583 * If map() returns -EPERM, this interrupt is protected
584 * by the firmware or some other service and shall not
585 * be mapped. Don't bother telling the user about it.
588 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
589 domain->name, hwirq, virq, ret);
591 irq_data->domain = NULL;
593 mutex_unlock(&irq_domain_mutex);
597 /* If not already assigned, give the domain the chip's name */
598 if (!domain->name && irq_data->chip)
599 domain->name = irq_data->chip->name;
603 irq_domain_set_mapping(domain, hwirq, irq_data);
604 mutex_unlock(&irq_domain_mutex);
606 irq_clear_status_flags(virq, IRQ_NOREQUEST);
610 EXPORT_SYMBOL_GPL(irq_domain_associate);
612 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
613 irq_hw_number_t hwirq_base, int count)
615 struct device_node *of_node;
618 of_node = irq_domain_get_of_node(domain);
619 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
620 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
622 for (i = 0; i < count; i++) {
623 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
626 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
628 #ifdef CONFIG_IRQ_DOMAIN_NOMAP
630 * irq_create_direct_mapping() - Allocate an irq for direct mapping
631 * @domain: domain to allocate the irq for or NULL for default domain
633 * This routine is used for irq controllers which can choose the hardware
634 * interrupt numbers they generate. In such a case it's simplest to use
635 * the linux irq as the hardware interrupt number. It still uses the linear
636 * or radix tree to store the mapping, but the irq controller can optimize
637 * the revmap path by using the hwirq directly.
639 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
641 struct device_node *of_node;
645 domain = irq_default_domain;
647 of_node = irq_domain_get_of_node(domain);
648 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
650 pr_debug("create_direct virq allocation failed\n");
653 if (virq >= domain->hwirq_max) {
654 pr_err("ERROR: no free irqs available below %lu maximum\n",
659 pr_debug("create_direct obtained virq %d\n", virq);
661 if (irq_domain_associate(domain, virq, virq)) {
668 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
672 * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
673 * @domain: domain owning this hardware interrupt or NULL for default domain
674 * @hwirq: hardware irq number in that domain space
675 * @affinity: irq affinity
677 * Only one mapping per hardware interrupt is permitted. Returns a linux
679 * If the sense/trigger is to be specified, set_irq_type() should be called
680 * on the number returned from that call.
682 unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
683 irq_hw_number_t hwirq,
684 const struct irq_affinity_desc *affinity)
686 struct device_node *of_node;
689 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
691 /* Look for default domain if necessary */
693 domain = irq_default_domain;
694 if (domain == NULL) {
695 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
698 pr_debug("-> using domain @%p\n", domain);
700 of_node = irq_domain_get_of_node(domain);
702 /* Check if mapping already exists */
703 virq = irq_find_mapping(domain, hwirq);
705 pr_debug("-> existing mapping on virq %d\n", virq);
709 /* Allocate a virtual interrupt number */
710 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
713 pr_debug("-> virq allocation failed\n");
717 if (irq_domain_associate(domain, virq, hwirq)) {
722 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
723 hwirq, of_node_full_name(of_node), virq);
727 EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
729 static int irq_domain_translate(struct irq_domain *d,
730 struct irq_fwspec *fwspec,
731 irq_hw_number_t *hwirq, unsigned int *type)
733 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
734 if (d->ops->translate)
735 return d->ops->translate(d, fwspec, hwirq, type);
738 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
739 fwspec->param, fwspec->param_count,
742 /* If domain has no translation, then we assume interrupt line */
743 *hwirq = fwspec->param[0];
747 void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
748 unsigned int count, struct irq_fwspec *fwspec)
752 fwspec->fwnode = of_node_to_fwnode(np);
753 fwspec->param_count = count;
755 for (i = 0; i < count; i++)
756 fwspec->param[i] = args[i];
758 EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
760 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
762 struct irq_domain *domain;
763 struct irq_data *irq_data;
764 irq_hw_number_t hwirq;
765 unsigned int type = IRQ_TYPE_NONE;
768 if (fwspec->fwnode) {
769 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
771 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
773 domain = irq_default_domain;
777 pr_warn("no irq domain found for %s !\n",
778 of_node_full_name(to_of_node(fwspec->fwnode)));
782 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
786 * WARN if the irqchip returns a type with bits
787 * outside the sense mask set and clear these bits.
789 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
790 type &= IRQ_TYPE_SENSE_MASK;
793 * If we've already configured this interrupt,
794 * don't do it again, or hell will break loose.
796 virq = irq_find_mapping(domain, hwirq);
799 * If the trigger type is not specified or matches the
800 * current trigger type then we are done so return the
803 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
807 * If the trigger type has not been set yet, then set
808 * it now and return the interrupt number.
810 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
811 irq_data = irq_get_irq_data(virq);
815 irqd_set_trigger_type(irq_data, type);
819 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
820 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
824 if (irq_domain_is_hierarchy(domain)) {
825 virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
830 virq = irq_create_mapping(domain, hwirq);
835 irq_data = irq_get_irq_data(virq);
837 if (irq_domain_is_hierarchy(domain))
838 irq_domain_free_irqs(virq, 1);
840 irq_dispose_mapping(virq);
844 /* Store trigger type */
845 irqd_set_trigger_type(irq_data, type);
849 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
851 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
853 struct irq_fwspec fwspec;
855 of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
856 irq_data->args_count, &fwspec);
858 return irq_create_fwspec_mapping(&fwspec);
860 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
863 * irq_dispose_mapping() - Unmap an interrupt
864 * @virq: linux irq number of the interrupt to unmap
866 void irq_dispose_mapping(unsigned int virq)
868 struct irq_data *irq_data = irq_get_irq_data(virq);
869 struct irq_domain *domain;
871 if (!virq || !irq_data)
874 domain = irq_data->domain;
875 if (WARN_ON(domain == NULL))
878 if (irq_domain_is_hierarchy(domain)) {
879 irq_domain_free_irqs(virq, 1);
881 irq_domain_disassociate(domain, virq);
885 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
888 * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
889 * @domain: domain owning this hardware interrupt
890 * @hwirq: hardware irq number in that domain space
891 * @irq: optional pointer to return the Linux irq if required
893 * Returns the interrupt descriptor.
895 struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
896 irq_hw_number_t hwirq,
899 struct irq_desc *desc = NULL;
900 struct irq_data *data;
902 /* Look for default domain if necessary */
904 domain = irq_default_domain;
908 if (irq_domain_is_nomap(domain)) {
909 if (hwirq < domain->hwirq_max) {
910 data = irq_domain_get_irq_data(domain, hwirq);
911 if (data && data->hwirq == hwirq)
912 desc = irq_data_to_desc(data);
921 /* Check if the hwirq is in the linear revmap. */
922 if (hwirq < domain->revmap_size)
923 data = rcu_dereference(domain->revmap[hwirq]);
925 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
928 desc = irq_data_to_desc(data);
936 EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
939 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
941 * Device Tree IRQ specifier translation function which works with one cell
942 * bindings where the cell value maps directly to the hwirq number.
944 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
945 const u32 *intspec, unsigned int intsize,
946 unsigned long *out_hwirq, unsigned int *out_type)
948 if (WARN_ON(intsize < 1))
950 *out_hwirq = intspec[0];
951 *out_type = IRQ_TYPE_NONE;
954 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
957 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
959 * Device Tree IRQ specifier translation function which works with two cell
960 * bindings where the cell values map directly to the hwirq number
961 * and linux irq flags.
963 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
964 const u32 *intspec, unsigned int intsize,
965 irq_hw_number_t *out_hwirq, unsigned int *out_type)
967 struct irq_fwspec fwspec;
969 of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
970 return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
972 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
975 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
977 * Device Tree IRQ specifier translation function which works with either one
978 * or two cell bindings where the cell values map directly to the hwirq number
979 * and linux irq flags.
981 * Note: don't use this function unless your interrupt controller explicitly
982 * supports both one and two cell bindings. For the majority of controllers
983 * the _onecell() or _twocell() variants above should be used.
985 int irq_domain_xlate_onetwocell(struct irq_domain *d,
986 struct device_node *ctrlr,
987 const u32 *intspec, unsigned int intsize,
988 unsigned long *out_hwirq, unsigned int *out_type)
990 if (WARN_ON(intsize < 1))
992 *out_hwirq = intspec[0];
994 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
996 *out_type = IRQ_TYPE_NONE;
999 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1001 const struct irq_domain_ops irq_domain_simple_ops = {
1002 .xlate = irq_domain_xlate_onetwocell,
1004 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1007 * irq_domain_translate_onecell() - Generic translate for direct one cell
1010 int irq_domain_translate_onecell(struct irq_domain *d,
1011 struct irq_fwspec *fwspec,
1012 unsigned long *out_hwirq,
1013 unsigned int *out_type)
1015 if (WARN_ON(fwspec->param_count < 1))
1017 *out_hwirq = fwspec->param[0];
1018 *out_type = IRQ_TYPE_NONE;
1021 EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1024 * irq_domain_translate_twocell() - Generic translate for direct two cell
1027 * Device Tree IRQ specifier translation function which works with two cell
1028 * bindings where the cell values map directly to the hwirq number
1029 * and linux irq flags.
1031 int irq_domain_translate_twocell(struct irq_domain *d,
1032 struct irq_fwspec *fwspec,
1033 unsigned long *out_hwirq,
1034 unsigned int *out_type)
1036 if (WARN_ON(fwspec->param_count < 2))
1038 *out_hwirq = fwspec->param[0];
1039 *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1042 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1044 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1045 int node, const struct irq_affinity_desc *affinity)
1050 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1053 hint = hwirq % nr_irqs;
1056 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1058 if (virq <= 0 && hint > 1) {
1059 virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1068 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1069 * @irq_data: The pointer to irq_data
1071 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1073 irq_data->hwirq = 0;
1074 irq_data->chip = &no_irq_chip;
1075 irq_data->chip_data = NULL;
1077 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1079 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1081 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1082 * @parent: Parent irq domain to associate with the new domain
1083 * @flags: Irq domain flags associated to the domain
1084 * @size: Size of the domain. See below
1085 * @fwnode: Optional fwnode of the interrupt controller
1086 * @ops: Pointer to the interrupt domain callbacks
1087 * @host_data: Controller private data pointer
1089 * If @size is 0 a tree domain is created, otherwise a linear domain.
1091 * If successful the parent is associated to the new domain and the
1092 * domain flags are set.
1093 * Returns pointer to IRQ domain, or NULL on failure.
1095 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1098 struct fwnode_handle *fwnode,
1099 const struct irq_domain_ops *ops,
1102 struct irq_domain *domain;
1105 domain = irq_domain_create_linear(fwnode, size, ops, host_data);
1107 domain = irq_domain_create_tree(fwnode, ops, host_data);
1109 domain->parent = parent;
1110 domain->flags |= flags;
1115 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1117 static void irq_domain_insert_irq(int virq)
1119 struct irq_data *data;
1121 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1122 struct irq_domain *domain = data->domain;
1125 irq_domain_set_mapping(domain, data->hwirq, data);
1127 /* If not already assigned, give the domain the chip's name */
1128 if (!domain->name && data->chip)
1129 domain->name = data->chip->name;
1132 irq_clear_status_flags(virq, IRQ_NOREQUEST);
1135 static void irq_domain_remove_irq(int virq)
1137 struct irq_data *data;
1139 irq_set_status_flags(virq, IRQ_NOREQUEST);
1140 irq_set_chip_and_handler(virq, NULL, NULL);
1141 synchronize_irq(virq);
1144 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1145 struct irq_domain *domain = data->domain;
1146 irq_hw_number_t hwirq = data->hwirq;
1149 irq_domain_clear_mapping(domain, hwirq);
1153 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1154 struct irq_data *child)
1156 struct irq_data *irq_data;
1158 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1159 irq_data_get_node(child));
1161 child->parent_data = irq_data;
1162 irq_data->irq = child->irq;
1163 irq_data->common = child->common;
1164 irq_data->domain = domain;
1170 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1172 struct irq_data *tmp;
1176 irq_data = irq_data->parent_data;
1181 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1183 struct irq_data *irq_data, *tmp;
1186 for (i = 0; i < nr_irqs; i++) {
1187 irq_data = irq_get_irq_data(virq + i);
1188 tmp = irq_data->parent_data;
1189 irq_data->parent_data = NULL;
1190 irq_data->domain = NULL;
1192 __irq_domain_free_hierarchy(tmp);
1197 * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1198 * @domain: IRQ domain from which the hierarchy is to be disconnected
1199 * @virq: IRQ number where the hierarchy is to be trimmed
1201 * Marks the @virq level belonging to @domain as disconnected.
1202 * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1205 * Its only use is to be able to trim levels of hierarchy that do not
1206 * have any real meaning for this interrupt, and that the driver marks
1207 * as such from its .alloc() callback.
1209 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1212 struct irq_data *irqd;
1214 irqd = irq_domain_get_irq_data(domain, virq);
1218 irqd->chip = ERR_PTR(-ENOTCONN);
1221 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1223 static int irq_domain_trim_hierarchy(unsigned int virq)
1225 struct irq_data *tail, *irqd, *irq_data;
1227 irq_data = irq_get_irq_data(virq);
1230 /* The first entry must have a valid irqchip */
1231 if (!irq_data->chip || IS_ERR(irq_data->chip))
1235 * Validate that the irq_data chain is sane in the presence of
1236 * a hierarchy trimming marker.
1238 for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1239 /* Can't have a valid irqchip after a trim marker */
1240 if (irqd->chip && tail)
1243 /* Can't have an empty irqchip before a trim marker */
1244 if (!irqd->chip && !tail)
1247 if (IS_ERR(irqd->chip)) {
1248 /* Only -ENOTCONN is a valid trim marker */
1249 if (PTR_ERR(irqd->chip) != -ENOTCONN)
1256 /* No trim marker, nothing to do */
1260 pr_info("IRQ%d: trimming hierarchy from %s\n",
1261 virq, tail->parent_data->domain->name);
1263 /* Sever the inner part of the hierarchy... */
1265 tail = tail->parent_data;
1266 irqd->parent_data = NULL;
1267 __irq_domain_free_hierarchy(tail);
1272 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1273 unsigned int virq, unsigned int nr_irqs)
1275 struct irq_data *irq_data;
1276 struct irq_domain *parent;
1279 /* The outermost irq_data is embedded in struct irq_desc */
1280 for (i = 0; i < nr_irqs; i++) {
1281 irq_data = irq_get_irq_data(virq + i);
1282 irq_data->domain = domain;
1284 for (parent = domain->parent; parent; parent = parent->parent) {
1285 irq_data = irq_domain_insert_irq_data(parent, irq_data);
1287 irq_domain_free_irq_data(virq, i + 1);
1297 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1298 * @domain: domain to match
1299 * @virq: IRQ number to get irq_data
1301 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1304 struct irq_data *irq_data;
1306 for (irq_data = irq_get_irq_data(virq); irq_data;
1307 irq_data = irq_data->parent_data)
1308 if (irq_data->domain == domain)
1313 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1316 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1317 * @domain: Interrupt domain to match
1319 * @hwirq: The hwirq number
1320 * @chip: The associated interrupt chip
1321 * @chip_data: The associated chip data
1323 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1324 irq_hw_number_t hwirq,
1325 const struct irq_chip *chip,
1328 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1333 irq_data->hwirq = hwirq;
1334 irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1335 irq_data->chip_data = chip_data;
1339 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1342 * irq_domain_set_info - Set the complete data for a @virq in @domain
1343 * @domain: Interrupt domain to match
1345 * @hwirq: The hardware interrupt number
1346 * @chip: The associated interrupt chip
1347 * @chip_data: The associated interrupt chip data
1348 * @handler: The interrupt flow handler
1349 * @handler_data: The interrupt flow handler data
1350 * @handler_name: The interrupt handler name
1352 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1353 irq_hw_number_t hwirq, const struct irq_chip *chip,
1354 void *chip_data, irq_flow_handler_t handler,
1355 void *handler_data, const char *handler_name)
1357 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1358 __irq_set_handler(virq, handler, 0, handler_name);
1359 irq_set_handler_data(virq, handler_data);
1361 EXPORT_SYMBOL(irq_domain_set_info);
1364 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1365 * @domain: Interrupt domain to match
1366 * @virq: IRQ number to start with
1367 * @nr_irqs: The number of irqs to free
1369 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1370 unsigned int nr_irqs)
1372 struct irq_data *irq_data;
1375 for (i = 0; i < nr_irqs; i++) {
1376 irq_data = irq_domain_get_irq_data(domain, virq + i);
1378 irq_domain_reset_irq_data(irq_data);
1380 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1382 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1385 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1386 * @domain: Interrupt domain to match
1387 * @virq: IRQ number to start with
1388 * @nr_irqs: The number of irqs to free
1390 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1391 unsigned int nr_irqs)
1395 for (i = 0; i < nr_irqs; i++) {
1396 irq_set_handler_data(virq + i, NULL);
1397 irq_set_handler(virq + i, NULL);
1399 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1402 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1403 unsigned int irq_base,
1404 unsigned int nr_irqs)
1408 if (!domain->ops->free)
1411 for (i = 0; i < nr_irqs; i++) {
1412 if (irq_domain_get_irq_data(domain, irq_base + i))
1413 domain->ops->free(domain, irq_base + i, 1);
1417 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1418 unsigned int irq_base,
1419 unsigned int nr_irqs, void *arg)
1421 if (!domain->ops->alloc) {
1422 pr_debug("domain->ops->alloc() is NULL\n");
1426 return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1430 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1431 * @domain: domain to allocate from
1432 * @irq_base: allocate specified IRQ number if irq_base >= 0
1433 * @nr_irqs: number of IRQs to allocate
1434 * @node: NUMA node id for memory allocation
1435 * @arg: domain specific argument
1436 * @realloc: IRQ descriptors have already been allocated if true
1437 * @affinity: Optional irq affinity mask for multiqueue devices
1439 * Allocate IRQ numbers and initialized all data structures to support
1440 * hierarchy IRQ domains.
1441 * Parameter @realloc is mainly to support legacy IRQs.
1442 * Returns error code or allocated IRQ number
1444 * The whole process to setup an IRQ has been split into two steps.
1445 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1446 * descriptor and required hardware resources. The second step,
1447 * irq_domain_activate_irq(), is to program the hardware with preallocated
1448 * resources. In this way, it's easier to rollback when failing to
1449 * allocate resources.
1451 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1452 unsigned int nr_irqs, int node, void *arg,
1453 bool realloc, const struct irq_affinity_desc *affinity)
1457 if (domain == NULL) {
1458 domain = irq_default_domain;
1459 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1463 if (realloc && irq_base >= 0) {
1466 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1469 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1475 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1476 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1481 mutex_lock(&irq_domain_mutex);
1482 ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1484 mutex_unlock(&irq_domain_mutex);
1485 goto out_free_irq_data;
1488 for (i = 0; i < nr_irqs; i++) {
1489 ret = irq_domain_trim_hierarchy(virq + i);
1491 mutex_unlock(&irq_domain_mutex);
1492 goto out_free_irq_data;
1496 for (i = 0; i < nr_irqs; i++)
1497 irq_domain_insert_irq(virq + i);
1498 mutex_unlock(&irq_domain_mutex);
1503 irq_domain_free_irq_data(virq, nr_irqs);
1505 irq_free_descs(virq, nr_irqs);
1508 EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1510 /* The irq_data was moved, fix the revmap to refer to the new location */
1511 static void irq_domain_fix_revmap(struct irq_data *d)
1515 if (irq_domain_is_nomap(d->domain))
1518 /* Fix up the revmap. */
1519 mutex_lock(&d->domain->revmap_mutex);
1520 if (d->hwirq < d->domain->revmap_size) {
1521 /* Not using radix tree */
1522 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1524 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1526 radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1528 mutex_unlock(&d->domain->revmap_mutex);
1532 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1533 * @domain: Domain to push.
1534 * @virq: Irq to push the domain in to.
1535 * @arg: Passed to the irq_domain_ops alloc() function.
1537 * For an already existing irqdomain hierarchy, as might be obtained
1538 * via a call to pci_enable_msix(), add an additional domain to the
1539 * head of the processing chain. Must be called before request_irq()
1542 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1544 struct irq_data *child_irq_data;
1545 struct irq_data *root_irq_data = irq_get_irq_data(virq);
1546 struct irq_desc *desc;
1550 * Check that no action has been set, which indicates the virq
1551 * is in a state where this function doesn't have to deal with
1552 * races between interrupt handling and maintaining the
1553 * hierarchy. This will catch gross misuse. Attempting to
1554 * make the check race free would require holding locks across
1555 * calls to struct irq_domain_ops->alloc(), which could lead
1556 * to deadlock, so we just do a simple check before starting.
1558 desc = irq_to_desc(virq);
1561 if (WARN_ON(desc->action))
1567 if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1573 if (domain->parent != root_irq_data->domain)
1576 child_irq_data = kzalloc_node(sizeof(*child_irq_data), GFP_KERNEL,
1577 irq_data_get_node(root_irq_data));
1578 if (!child_irq_data)
1581 mutex_lock(&irq_domain_mutex);
1583 /* Copy the original irq_data. */
1584 *child_irq_data = *root_irq_data;
1587 * Overwrite the root_irq_data, which is embedded in struct
1588 * irq_desc, with values for this domain.
1590 root_irq_data->parent_data = child_irq_data;
1591 root_irq_data->domain = domain;
1592 root_irq_data->mask = 0;
1593 root_irq_data->hwirq = 0;
1594 root_irq_data->chip = NULL;
1595 root_irq_data->chip_data = NULL;
1597 /* May (probably does) set hwirq, chip, etc. */
1598 rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1600 /* Restore the original irq_data. */
1601 *root_irq_data = *child_irq_data;
1602 kfree(child_irq_data);
1606 irq_domain_fix_revmap(child_irq_data);
1607 irq_domain_set_mapping(domain, root_irq_data->hwirq, root_irq_data);
1610 mutex_unlock(&irq_domain_mutex);
1614 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1617 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1618 * @domain: Domain to remove.
1619 * @virq: Irq to remove the domain from.
1621 * Undo the effects of a call to irq_domain_push_irq(). Must be
1622 * called either before request_irq() or after free_irq().
1624 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1626 struct irq_data *root_irq_data = irq_get_irq_data(virq);
1627 struct irq_data *child_irq_data;
1628 struct irq_data *tmp_irq_data;
1629 struct irq_desc *desc;
1632 * Check that no action is set, which indicates the virq is in
1633 * a state where this function doesn't have to deal with races
1634 * between interrupt handling and maintaining the hierarchy.
1635 * This will catch gross misuse. Attempting to make the check
1636 * race free would require holding locks across calls to
1637 * struct irq_domain_ops->free(), which could lead to
1638 * deadlock, so we just do a simple check before starting.
1640 desc = irq_to_desc(virq);
1643 if (WARN_ON(desc->action))
1652 tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1654 /* We can only "pop" if this domain is at the top of the list */
1655 if (WARN_ON(root_irq_data != tmp_irq_data))
1658 if (WARN_ON(root_irq_data->domain != domain))
1661 child_irq_data = root_irq_data->parent_data;
1662 if (WARN_ON(!child_irq_data))
1665 mutex_lock(&irq_domain_mutex);
1667 root_irq_data->parent_data = NULL;
1669 irq_domain_clear_mapping(domain, root_irq_data->hwirq);
1670 irq_domain_free_irqs_hierarchy(domain, virq, 1);
1672 /* Restore the original irq_data. */
1673 *root_irq_data = *child_irq_data;
1675 irq_domain_fix_revmap(root_irq_data);
1677 mutex_unlock(&irq_domain_mutex);
1679 kfree(child_irq_data);
1683 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1686 * irq_domain_free_irqs - Free IRQ number and associated data structures
1687 * @virq: base IRQ number
1688 * @nr_irqs: number of IRQs to free
1690 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1692 struct irq_data *data = irq_get_irq_data(virq);
1695 if (WARN(!data || !data->domain || !data->domain->ops->free,
1696 "NULL pointer, cannot free irq\n"))
1699 mutex_lock(&irq_domain_mutex);
1700 for (i = 0; i < nr_irqs; i++)
1701 irq_domain_remove_irq(virq + i);
1702 irq_domain_free_irqs_hierarchy(data->domain, virq, nr_irqs);
1703 mutex_unlock(&irq_domain_mutex);
1705 irq_domain_free_irq_data(virq, nr_irqs);
1706 irq_free_descs(virq, nr_irqs);
1710 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1711 * @domain: Domain below which interrupts must be allocated
1712 * @irq_base: Base IRQ number
1713 * @nr_irqs: Number of IRQs to allocate
1714 * @arg: Allocation data (arch/domain specific)
1716 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1717 unsigned int irq_base, unsigned int nr_irqs,
1720 if (!domain->parent)
1723 return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1726 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1729 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1730 * @domain: Domain below which interrupts must be freed
1731 * @irq_base: Base IRQ number
1732 * @nr_irqs: Number of IRQs to free
1734 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1735 unsigned int irq_base, unsigned int nr_irqs)
1737 if (!domain->parent)
1740 irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1742 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1744 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1746 if (irq_data && irq_data->domain) {
1747 struct irq_domain *domain = irq_data->domain;
1749 if (domain->ops->deactivate)
1750 domain->ops->deactivate(domain, irq_data);
1751 if (irq_data->parent_data)
1752 __irq_domain_deactivate_irq(irq_data->parent_data);
1756 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1760 if (irqd && irqd->domain) {
1761 struct irq_domain *domain = irqd->domain;
1763 if (irqd->parent_data)
1764 ret = __irq_domain_activate_irq(irqd->parent_data,
1766 if (!ret && domain->ops->activate) {
1767 ret = domain->ops->activate(domain, irqd, reserve);
1768 /* Rollback in case of error */
1769 if (ret && irqd->parent_data)
1770 __irq_domain_deactivate_irq(irqd->parent_data);
1777 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1779 * @irq_data: Outermost irq_data associated with interrupt
1780 * @reserve: If set only reserve an interrupt vector instead of assigning one
1782 * This is the second step to call domain_ops->activate to program interrupt
1783 * controllers, so the interrupt could actually get delivered.
1785 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1789 if (!irqd_is_activated(irq_data))
1790 ret = __irq_domain_activate_irq(irq_data, reserve);
1792 irqd_set_activated(irq_data);
1797 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1798 * deactivate interrupt
1799 * @irq_data: outermost irq_data associated with interrupt
1801 * It calls domain_ops->deactivate to program interrupt controllers to disable
1802 * interrupt delivery.
1804 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1806 if (irqd_is_activated(irq_data)) {
1807 __irq_domain_deactivate_irq(irq_data);
1808 irqd_clr_activated(irq_data);
1812 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1814 /* Hierarchy irq_domains must implement callback alloc() */
1815 if (domain->ops->alloc)
1816 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1820 * irq_domain_hierarchical_is_msi_remap - Check if the domain or any
1821 * parent has MSI remapping support
1822 * @domain: domain pointer
1824 bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
1826 for (; domain; domain = domain->parent) {
1827 if (irq_domain_is_msi_remap(domain))
1832 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1834 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1835 * @domain: domain to match
1836 * @virq: IRQ number to get irq_data
1838 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1841 struct irq_data *irq_data = irq_get_irq_data(virq);
1843 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1845 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1848 * irq_domain_set_info - Set the complete data for a @virq in @domain
1849 * @domain: Interrupt domain to match
1851 * @hwirq: The hardware interrupt number
1852 * @chip: The associated interrupt chip
1853 * @chip_data: The associated interrupt chip data
1854 * @handler: The interrupt flow handler
1855 * @handler_data: The interrupt flow handler data
1856 * @handler_name: The interrupt handler name
1858 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1859 irq_hw_number_t hwirq, const struct irq_chip *chip,
1860 void *chip_data, irq_flow_handler_t handler,
1861 void *handler_data, const char *handler_name)
1863 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1864 irq_set_chip_data(virq, chip_data);
1865 irq_set_handler_data(virq, handler_data);
1868 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1871 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1873 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1874 static struct dentry *domain_dir;
1877 irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1879 seq_printf(m, "%*sname: %s\n", ind, "", d->name);
1880 seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size);
1881 seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1882 seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
1883 if (d->ops && d->ops->debug_show)
1884 d->ops->debug_show(m, d, NULL, ind + 1);
1885 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1888 seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1889 irq_domain_debug_show_one(m, d->parent, ind + 4);
1893 static int irq_domain_debug_show(struct seq_file *m, void *p)
1895 struct irq_domain *d = m->private;
1897 /* Default domain? Might be NULL */
1899 if (!irq_default_domain)
1901 d = irq_default_domain;
1903 irq_domain_debug_show_one(m, d, 0);
1906 DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1908 static void debugfs_add_domain_dir(struct irq_domain *d)
1910 if (!d->name || !domain_dir)
1912 debugfs_create_file(d->name, 0444, domain_dir, d,
1913 &irq_domain_debug_fops);
1916 static void debugfs_remove_domain_dir(struct irq_domain *d)
1918 debugfs_remove(debugfs_lookup(d->name, domain_dir));
1921 void __init irq_domain_debugfs_init(struct dentry *root)
1923 struct irq_domain *d;
1925 domain_dir = debugfs_create_dir("domains", root);
1927 debugfs_create_file("default", 0444, domain_dir, NULL,
1928 &irq_domain_debug_fops);
1929 mutex_lock(&irq_domain_mutex);
1930 list_for_each_entry(d, &irq_domain_list, link)
1931 debugfs_add_domain_dir(d);
1932 mutex_unlock(&irq_domain_mutex);