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 int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
29 unsigned int nr_irqs, int node, void *arg,
30 bool realloc, const struct irq_affinity_desc *affinity);
31 static void irq_domain_check_hierarchy(struct irq_domain *domain);
32 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq);
35 struct fwnode_handle fwnode;
41 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
42 static void debugfs_add_domain_dir(struct irq_domain *d);
43 static void debugfs_remove_domain_dir(struct irq_domain *d);
45 static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
46 static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
49 static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
51 struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
56 const struct fwnode_operations irqchip_fwnode_ops = {
57 .get_name = irqchip_fwnode_get_name,
59 EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
62 * __irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
63 * identifying an irq domain
64 * @type: Type of irqchip_fwnode. See linux/irqdomain.h
65 * @id: Optional user provided id if name != NULL
66 * @name: Optional user provided domain name
67 * @pa: Optional user-provided physical address
69 * Allocate a struct irqchip_fwid, and return a pointer to the embedded
70 * fwnode_handle (or NULL on failure).
72 * Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
73 * solely to transport name information to irqdomain creation code. The
74 * node is not stored. For other types the pointer is kept in the irq
77 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
81 struct irqchip_fwid *fwid;
84 fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
87 case IRQCHIP_FWNODE_NAMED:
88 n = kasprintf(GFP_KERNEL, "%s", name);
90 case IRQCHIP_FWNODE_NAMED_ID:
91 n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
94 n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
107 fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
108 return &fwid->fwnode;
110 EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
113 * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
115 * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
117 void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
119 struct irqchip_fwid *fwid;
121 if (!fwnode || WARN_ON(!is_fwnode_irqchip(fwnode)))
124 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
128 EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
130 static struct irq_domain *__irq_domain_create(struct fwnode_handle *fwnode,
132 irq_hw_number_t hwirq_max,
134 const struct irq_domain_ops *ops,
137 struct irqchip_fwid *fwid;
138 struct irq_domain *domain;
140 static atomic_t unknown_domains;
142 if (WARN_ON((size && direct_max) ||
143 (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max) ||
144 (direct_max && (direct_max != hwirq_max))))
147 domain = kzalloc_node(struct_size(domain, revmap, size),
148 GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
152 if (is_fwnode_irqchip(fwnode)) {
153 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
155 switch (fwid->type) {
156 case IRQCHIP_FWNODE_NAMED:
157 case IRQCHIP_FWNODE_NAMED_ID:
158 domain->fwnode = fwnode;
159 domain->name = kstrdup(fwid->name, GFP_KERNEL);
164 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
167 domain->fwnode = fwnode;
168 domain->name = fwid->name;
171 } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
172 is_software_node(fwnode)) {
176 * fwnode paths contain '/', which debugfs is legitimately
177 * unhappy about. Replace them with ':', which does
178 * the trick and is not as offensive as '\'...
180 name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
186 domain->name = strreplace(name, '/', ':');
187 domain->fwnode = fwnode;
188 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
193 pr_err("Invalid fwnode type for irqdomain\n");
194 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
195 atomic_inc_return(&unknown_domains));
200 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
203 fwnode_handle_get(fwnode);
204 fwnode_dev_initialized(fwnode, true);
207 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
209 domain->host_data = host_data;
210 domain->hwirq_max = hwirq_max;
213 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
215 domain->revmap_size = size;
218 * Hierarchical domains use the domain lock of the root domain
219 * (innermost domain).
221 * For non-hierarchical domains (as for root domains), the root
222 * pointer is set to the domain itself so that &domain->root->mutex
223 * always points to the right lock.
225 mutex_init(&domain->mutex);
226 domain->root = domain;
228 irq_domain_check_hierarchy(domain);
233 static void __irq_domain_publish(struct irq_domain *domain)
235 mutex_lock(&irq_domain_mutex);
236 debugfs_add_domain_dir(domain);
237 list_add(&domain->link, &irq_domain_list);
238 mutex_unlock(&irq_domain_mutex);
240 pr_debug("Added domain %s\n", domain->name);
244 * __irq_domain_add() - Allocate a new irq_domain data structure
245 * @fwnode: firmware node for the interrupt controller
246 * @size: Size of linear map; 0 for radix mapping only
247 * @hwirq_max: Maximum number of interrupts supported by controller
248 * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
250 * @ops: domain callbacks
251 * @host_data: Controller private data pointer
253 * Allocates and initializes an irq_domain structure.
254 * Returns pointer to IRQ domain, or NULL on failure.
256 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
257 irq_hw_number_t hwirq_max, int direct_max,
258 const struct irq_domain_ops *ops,
261 struct irq_domain *domain;
263 domain = __irq_domain_create(fwnode, size, hwirq_max, direct_max,
266 __irq_domain_publish(domain);
270 EXPORT_SYMBOL_GPL(__irq_domain_add);
273 * irq_domain_remove() - Remove an irq domain.
274 * @domain: domain to remove
276 * This routine is used to remove an irq domain. The caller must ensure
277 * that all mappings within the domain have been disposed of prior to
278 * use, depending on the revmap type.
280 void irq_domain_remove(struct irq_domain *domain)
282 mutex_lock(&irq_domain_mutex);
283 debugfs_remove_domain_dir(domain);
285 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
287 list_del(&domain->link);
290 * If the going away domain is the default one, reset it.
292 if (unlikely(irq_default_domain == domain))
293 irq_set_default_host(NULL);
295 mutex_unlock(&irq_domain_mutex);
297 pr_debug("Removed domain %s\n", domain->name);
299 fwnode_dev_initialized(domain->fwnode, false);
300 fwnode_handle_put(domain->fwnode);
301 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
305 EXPORT_SYMBOL_GPL(irq_domain_remove);
307 void irq_domain_update_bus_token(struct irq_domain *domain,
308 enum irq_domain_bus_token bus_token)
312 if (domain->bus_token == bus_token)
315 mutex_lock(&irq_domain_mutex);
317 domain->bus_token = bus_token;
319 name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
321 mutex_unlock(&irq_domain_mutex);
325 debugfs_remove_domain_dir(domain);
327 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
330 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
333 debugfs_add_domain_dir(domain);
335 mutex_unlock(&irq_domain_mutex);
337 EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
340 * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
341 * @fwnode: firmware node for the interrupt controller
342 * @size: total number of irqs in mapping
343 * @first_irq: first number of irq block assigned to the domain,
344 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
345 * pre-map all of the irqs in the domain to virqs starting at first_irq.
346 * @ops: domain callbacks
347 * @host_data: Controller private data pointer
349 * Allocates an irq_domain, and optionally if first_irq is positive then also
350 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
352 * This is intended to implement the expected behaviour for most
353 * interrupt controllers. If device tree is used, then first_irq will be 0 and
354 * irqs get mapped dynamically on the fly. However, if the controller requires
355 * static virq assignments (non-DT boot) then it will set that up correctly.
357 struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
359 unsigned int first_irq,
360 const struct irq_domain_ops *ops,
363 struct irq_domain *domain;
365 domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data);
370 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
371 /* attempt to allocated irq_descs */
372 int rc = irq_alloc_descs(first_irq, first_irq, size,
373 of_node_to_nid(to_of_node(fwnode)));
375 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
378 irq_domain_associate_many(domain, first_irq, 0, size);
383 EXPORT_SYMBOL_GPL(irq_domain_create_simple);
386 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
387 * @of_node: pointer to interrupt controller's device tree node.
388 * @size: total number of irqs in legacy mapping
389 * @first_irq: first number of irq block assigned to the domain
390 * @first_hwirq: first hwirq number to use for the translation. Should normally
391 * be '0', but a positive integer can be used if the effective
392 * hwirqs numbering does not begin at zero.
393 * @ops: map/unmap domain callbacks
394 * @host_data: Controller private data pointer
396 * Note: the map() callback will be called before this function returns
397 * for all legacy interrupts except 0 (which is always the invalid irq for
398 * a legacy controller).
400 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
402 unsigned int first_irq,
403 irq_hw_number_t first_hwirq,
404 const struct irq_domain_ops *ops,
407 return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
408 first_irq, first_hwirq, ops, host_data);
410 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
412 struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
414 unsigned int first_irq,
415 irq_hw_number_t first_hwirq,
416 const struct irq_domain_ops *ops,
419 struct irq_domain *domain;
421 domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
423 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
427 EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
430 * irq_find_matching_fwspec() - Locates a domain for a given fwspec
431 * @fwspec: FW specifier for an interrupt
432 * @bus_token: domain-specific data
434 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
435 enum irq_domain_bus_token bus_token)
437 struct irq_domain *h, *found = NULL;
438 struct fwnode_handle *fwnode = fwspec->fwnode;
441 /* We might want to match the legacy controller last since
442 * it might potentially be set to match all interrupts in
443 * the absence of a device node. This isn't a problem so far
446 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
447 * values must generate an exact match for the domain to be
450 mutex_lock(&irq_domain_mutex);
451 list_for_each_entry(h, &irq_domain_list, link) {
452 if (h->ops->select && bus_token != DOMAIN_BUS_ANY)
453 rc = h->ops->select(h, fwspec, bus_token);
454 else if (h->ops->match)
455 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
457 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
458 ((bus_token == DOMAIN_BUS_ANY) ||
459 (h->bus_token == bus_token)));
466 mutex_unlock(&irq_domain_mutex);
469 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
472 * irq_set_default_host() - Set a "default" irq domain
473 * @domain: default domain pointer
475 * For convenience, it's possible to set a "default" domain that will be used
476 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
477 * platforms that want to manipulate a few hard coded interrupt numbers that
478 * aren't properly represented in the device-tree.
480 void irq_set_default_host(struct irq_domain *domain)
482 pr_debug("Default domain set to @0x%p\n", domain);
484 irq_default_domain = domain;
486 EXPORT_SYMBOL_GPL(irq_set_default_host);
489 * irq_get_default_host() - Retrieve the "default" irq domain
491 * Returns: the default domain, if any.
493 * Modern code should never use this. This should only be used on
494 * systems that cannot implement a firmware->fwnode mapping (which
495 * both DT and ACPI provide).
497 struct irq_domain *irq_get_default_host(void)
499 return irq_default_domain;
501 EXPORT_SYMBOL_GPL(irq_get_default_host);
503 static bool irq_domain_is_nomap(struct irq_domain *domain)
505 return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
506 (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
509 static void irq_domain_clear_mapping(struct irq_domain *domain,
510 irq_hw_number_t hwirq)
512 lockdep_assert_held(&domain->root->mutex);
514 if (irq_domain_is_nomap(domain))
517 if (hwirq < domain->revmap_size)
518 rcu_assign_pointer(domain->revmap[hwirq], NULL);
520 radix_tree_delete(&domain->revmap_tree, hwirq);
523 static void irq_domain_set_mapping(struct irq_domain *domain,
524 irq_hw_number_t hwirq,
525 struct irq_data *irq_data)
528 * This also makes sure that all domains point to the same root when
529 * called from irq_domain_insert_irq() for each domain in a hierarchy.
531 lockdep_assert_held(&domain->root->mutex);
533 if (irq_domain_is_nomap(domain))
536 if (hwirq < domain->revmap_size)
537 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
539 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
542 static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
544 struct irq_data *irq_data = irq_get_irq_data(irq);
545 irq_hw_number_t hwirq;
547 if (WARN(!irq_data || irq_data->domain != domain,
548 "virq%i doesn't exist; cannot disassociate\n", irq))
551 hwirq = irq_data->hwirq;
553 mutex_lock(&domain->root->mutex);
555 irq_set_status_flags(irq, IRQ_NOREQUEST);
557 /* remove chip and handler */
558 irq_set_chip_and_handler(irq, NULL, NULL);
560 /* Make sure it's completed */
561 synchronize_irq(irq);
563 /* Tell the PIC about it */
564 if (domain->ops->unmap)
565 domain->ops->unmap(domain, irq);
568 irq_data->domain = NULL;
572 /* Clear reverse map for this hwirq */
573 irq_domain_clear_mapping(domain, hwirq);
575 mutex_unlock(&domain->root->mutex);
578 static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
579 irq_hw_number_t hwirq)
581 struct irq_data *irq_data = irq_get_irq_data(virq);
584 if (WARN(hwirq >= domain->hwirq_max,
585 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
587 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
589 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
592 irq_data->hwirq = hwirq;
593 irq_data->domain = domain;
594 if (domain->ops->map) {
595 ret = domain->ops->map(domain, virq, hwirq);
598 * If map() returns -EPERM, this interrupt is protected
599 * by the firmware or some other service and shall not
600 * be mapped. Don't bother telling the user about it.
603 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
604 domain->name, hwirq, virq, ret);
606 irq_data->domain = NULL;
613 irq_domain_set_mapping(domain, hwirq, irq_data);
615 irq_clear_status_flags(virq, IRQ_NOREQUEST);
620 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
621 irq_hw_number_t hwirq)
625 mutex_lock(&domain->root->mutex);
626 ret = irq_domain_associate_locked(domain, virq, hwirq);
627 mutex_unlock(&domain->root->mutex);
631 EXPORT_SYMBOL_GPL(irq_domain_associate);
633 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
634 irq_hw_number_t hwirq_base, int count)
636 struct device_node *of_node;
639 of_node = irq_domain_get_of_node(domain);
640 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
641 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
643 for (i = 0; i < count; i++)
644 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
646 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
648 #ifdef CONFIG_IRQ_DOMAIN_NOMAP
650 * irq_create_direct_mapping() - Allocate an irq for direct mapping
651 * @domain: domain to allocate the irq for or NULL for default domain
653 * This routine is used for irq controllers which can choose the hardware
654 * interrupt numbers they generate. In such a case it's simplest to use
655 * the linux irq as the hardware interrupt number. It still uses the linear
656 * or radix tree to store the mapping, but the irq controller can optimize
657 * the revmap path by using the hwirq directly.
659 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
661 struct device_node *of_node;
665 domain = irq_default_domain;
667 of_node = irq_domain_get_of_node(domain);
668 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
670 pr_debug("create_direct virq allocation failed\n");
673 if (virq >= domain->hwirq_max) {
674 pr_err("ERROR: no free irqs available below %lu maximum\n",
679 pr_debug("create_direct obtained virq %d\n", virq);
681 if (irq_domain_associate(domain, virq, virq)) {
688 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
691 static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
692 irq_hw_number_t hwirq,
693 const struct irq_affinity_desc *affinity)
695 struct device_node *of_node = irq_domain_get_of_node(domain);
698 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
700 /* Allocate a virtual interrupt number */
701 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
704 pr_debug("-> virq allocation failed\n");
708 if (irq_domain_associate_locked(domain, virq, hwirq)) {
713 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
714 hwirq, of_node_full_name(of_node), virq);
720 * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
721 * @domain: domain owning this hardware interrupt or NULL for default domain
722 * @hwirq: hardware irq number in that domain space
723 * @affinity: irq affinity
725 * Only one mapping per hardware interrupt is permitted. Returns a linux
727 * If the sense/trigger is to be specified, set_irq_type() should be called
728 * on the number returned from that call.
730 unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
731 irq_hw_number_t hwirq,
732 const struct irq_affinity_desc *affinity)
736 /* Look for default domain if necessary */
738 domain = irq_default_domain;
739 if (domain == NULL) {
740 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
744 mutex_lock(&domain->root->mutex);
746 /* Check if mapping already exists */
747 virq = irq_find_mapping(domain, hwirq);
749 pr_debug("existing mapping on virq %d\n", virq);
753 virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
755 mutex_unlock(&domain->root->mutex);
759 EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
761 static int irq_domain_translate(struct irq_domain *d,
762 struct irq_fwspec *fwspec,
763 irq_hw_number_t *hwirq, unsigned int *type)
765 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
766 if (d->ops->translate)
767 return d->ops->translate(d, fwspec, hwirq, type);
770 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
771 fwspec->param, fwspec->param_count,
774 /* If domain has no translation, then we assume interrupt line */
775 *hwirq = fwspec->param[0];
779 void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
780 unsigned int count, struct irq_fwspec *fwspec)
784 fwspec->fwnode = of_node_to_fwnode(np);
785 fwspec->param_count = count;
787 for (i = 0; i < count; i++)
788 fwspec->param[i] = args[i];
790 EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
792 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
794 struct irq_domain *domain;
795 struct irq_data *irq_data;
796 irq_hw_number_t hwirq;
797 unsigned int type = IRQ_TYPE_NONE;
800 if (fwspec->fwnode) {
801 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
803 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
805 domain = irq_default_domain;
809 pr_warn("no irq domain found for %s !\n",
810 of_node_full_name(to_of_node(fwspec->fwnode)));
814 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
818 * WARN if the irqchip returns a type with bits
819 * outside the sense mask set and clear these bits.
821 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
822 type &= IRQ_TYPE_SENSE_MASK;
824 mutex_lock(&domain->root->mutex);
827 * If we've already configured this interrupt,
828 * don't do it again, or hell will break loose.
830 virq = irq_find_mapping(domain, hwirq);
833 * If the trigger type is not specified or matches the
834 * current trigger type then we are done so return the
837 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
841 * If the trigger type has not been set yet, then set
842 * it now and return the interrupt number.
844 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
845 irq_data = irq_get_irq_data(virq);
851 irqd_set_trigger_type(irq_data, type);
855 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
856 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
861 if (irq_domain_is_hierarchy(domain)) {
862 if (irq_domain_is_msi_device(domain)) {
863 mutex_unlock(&domain->root->mutex);
864 virq = msi_device_domain_alloc_wired(domain, hwirq, type);
865 mutex_lock(&domain->root->mutex);
867 virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
868 fwspec, false, NULL);
875 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
880 irq_data = irq_get_irq_data(virq);
881 if (WARN_ON(!irq_data)) {
886 /* Store trigger type */
887 irqd_set_trigger_type(irq_data, type);
889 mutex_unlock(&domain->root->mutex);
893 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
895 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
897 struct irq_fwspec fwspec;
899 of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
900 irq_data->args_count, &fwspec);
902 return irq_create_fwspec_mapping(&fwspec);
904 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
907 * irq_dispose_mapping() - Unmap an interrupt
908 * @virq: linux irq number of the interrupt to unmap
910 void irq_dispose_mapping(unsigned int virq)
912 struct irq_data *irq_data;
913 struct irq_domain *domain;
915 irq_data = virq ? irq_get_irq_data(virq) : NULL;
919 domain = irq_data->domain;
920 if (WARN_ON(domain == NULL))
923 if (irq_domain_is_hierarchy(domain)) {
924 irq_domain_free_one_irq(domain, virq);
926 irq_domain_disassociate(domain, virq);
930 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
933 * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
934 * @domain: domain owning this hardware interrupt
935 * @hwirq: hardware irq number in that domain space
936 * @irq: optional pointer to return the Linux irq if required
938 * Returns the interrupt descriptor.
940 struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
941 irq_hw_number_t hwirq,
944 struct irq_desc *desc = NULL;
945 struct irq_data *data;
947 /* Look for default domain if necessary */
949 domain = irq_default_domain;
953 if (irq_domain_is_nomap(domain)) {
954 if (hwirq < domain->hwirq_max) {
955 data = irq_domain_get_irq_data(domain, hwirq);
956 if (data && data->hwirq == hwirq)
957 desc = irq_data_to_desc(data);
966 /* Check if the hwirq is in the linear revmap. */
967 if (hwirq < domain->revmap_size)
968 data = rcu_dereference(domain->revmap[hwirq]);
970 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
973 desc = irq_data_to_desc(data);
981 EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
984 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
986 * Device Tree IRQ specifier translation function which works with one cell
987 * bindings where the cell value maps directly to the hwirq number.
989 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
990 const u32 *intspec, unsigned int intsize,
991 unsigned long *out_hwirq, unsigned int *out_type)
993 if (WARN_ON(intsize < 1))
995 *out_hwirq = intspec[0];
996 *out_type = IRQ_TYPE_NONE;
999 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
1002 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1004 * Device Tree IRQ specifier translation function which works with two cell
1005 * bindings where the cell values map directly to the hwirq number
1006 * and linux irq flags.
1008 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1009 const u32 *intspec, unsigned int intsize,
1010 irq_hw_number_t *out_hwirq, unsigned int *out_type)
1012 struct irq_fwspec fwspec;
1014 of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1015 return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1017 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1020 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1022 * Device Tree IRQ specifier translation function which works with either one
1023 * or two cell bindings where the cell values map directly to the hwirq number
1024 * and linux irq flags.
1026 * Note: don't use this function unless your interrupt controller explicitly
1027 * supports both one and two cell bindings. For the majority of controllers
1028 * the _onecell() or _twocell() variants above should be used.
1030 int irq_domain_xlate_onetwocell(struct irq_domain *d,
1031 struct device_node *ctrlr,
1032 const u32 *intspec, unsigned int intsize,
1033 unsigned long *out_hwirq, unsigned int *out_type)
1035 if (WARN_ON(intsize < 1))
1037 *out_hwirq = intspec[0];
1039 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1041 *out_type = IRQ_TYPE_NONE;
1044 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1046 const struct irq_domain_ops irq_domain_simple_ops = {
1047 .xlate = irq_domain_xlate_onetwocell,
1049 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1052 * irq_domain_translate_onecell() - Generic translate for direct one cell
1055 int irq_domain_translate_onecell(struct irq_domain *d,
1056 struct irq_fwspec *fwspec,
1057 unsigned long *out_hwirq,
1058 unsigned int *out_type)
1060 if (WARN_ON(fwspec->param_count < 1))
1062 *out_hwirq = fwspec->param[0];
1063 *out_type = IRQ_TYPE_NONE;
1066 EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1069 * irq_domain_translate_twocell() - Generic translate for direct two cell
1072 * Device Tree IRQ specifier translation function which works with two cell
1073 * bindings where the cell values map directly to the hwirq number
1074 * and linux irq flags.
1076 int irq_domain_translate_twocell(struct irq_domain *d,
1077 struct irq_fwspec *fwspec,
1078 unsigned long *out_hwirq,
1079 unsigned int *out_type)
1081 if (WARN_ON(fwspec->param_count < 2))
1083 *out_hwirq = fwspec->param[0];
1084 *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1087 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1089 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1090 int node, const struct irq_affinity_desc *affinity)
1095 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1098 hint = hwirq % nr_irqs;
1101 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1103 if (virq <= 0 && hint > 1) {
1104 virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1113 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1114 * @irq_data: The pointer to irq_data
1116 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1118 irq_data->hwirq = 0;
1119 irq_data->chip = &no_irq_chip;
1120 irq_data->chip_data = NULL;
1122 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1124 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1126 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1127 * @parent: Parent irq domain to associate with the new domain
1128 * @flags: Irq domain flags associated to the domain
1129 * @size: Size of the domain. See below
1130 * @fwnode: Optional fwnode of the interrupt controller
1131 * @ops: Pointer to the interrupt domain callbacks
1132 * @host_data: Controller private data pointer
1134 * If @size is 0 a tree domain is created, otherwise a linear domain.
1136 * If successful the parent is associated to the new domain and the
1137 * domain flags are set.
1138 * Returns pointer to IRQ domain, or NULL on failure.
1140 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1143 struct fwnode_handle *fwnode,
1144 const struct irq_domain_ops *ops,
1147 struct irq_domain *domain;
1150 domain = __irq_domain_create(fwnode, size, size, 0, ops, host_data);
1152 domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
1156 domain->root = parent->root;
1157 domain->parent = parent;
1158 domain->flags |= flags;
1160 __irq_domain_publish(domain);
1165 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1167 static void irq_domain_insert_irq(int virq)
1169 struct irq_data *data;
1171 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1172 struct irq_domain *domain = data->domain;
1175 irq_domain_set_mapping(domain, data->hwirq, data);
1178 irq_clear_status_flags(virq, IRQ_NOREQUEST);
1181 static void irq_domain_remove_irq(int virq)
1183 struct irq_data *data;
1185 irq_set_status_flags(virq, IRQ_NOREQUEST);
1186 irq_set_chip_and_handler(virq, NULL, NULL);
1187 synchronize_irq(virq);
1190 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1191 struct irq_domain *domain = data->domain;
1192 irq_hw_number_t hwirq = data->hwirq;
1195 irq_domain_clear_mapping(domain, hwirq);
1199 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1200 struct irq_data *child)
1202 struct irq_data *irq_data;
1204 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1205 irq_data_get_node(child));
1207 child->parent_data = irq_data;
1208 irq_data->irq = child->irq;
1209 irq_data->common = child->common;
1210 irq_data->domain = domain;
1216 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1218 struct irq_data *tmp;
1222 irq_data = irq_data->parent_data;
1227 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1229 struct irq_data *irq_data, *tmp;
1232 for (i = 0; i < nr_irqs; i++) {
1233 irq_data = irq_get_irq_data(virq + i);
1234 tmp = irq_data->parent_data;
1235 irq_data->parent_data = NULL;
1236 irq_data->domain = NULL;
1238 __irq_domain_free_hierarchy(tmp);
1243 * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1244 * @domain: IRQ domain from which the hierarchy is to be disconnected
1245 * @virq: IRQ number where the hierarchy is to be trimmed
1247 * Marks the @virq level belonging to @domain as disconnected.
1248 * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1251 * Its only use is to be able to trim levels of hierarchy that do not
1252 * have any real meaning for this interrupt, and that the driver marks
1253 * as such from its .alloc() callback.
1255 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1258 struct irq_data *irqd;
1260 irqd = irq_domain_get_irq_data(domain, virq);
1264 irqd->chip = ERR_PTR(-ENOTCONN);
1267 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1269 static int irq_domain_trim_hierarchy(unsigned int virq)
1271 struct irq_data *tail, *irqd, *irq_data;
1273 irq_data = irq_get_irq_data(virq);
1276 /* The first entry must have a valid irqchip */
1277 if (!irq_data->chip || IS_ERR(irq_data->chip))
1281 * Validate that the irq_data chain is sane in the presence of
1282 * a hierarchy trimming marker.
1284 for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1285 /* Can't have a valid irqchip after a trim marker */
1286 if (irqd->chip && tail)
1289 /* Can't have an empty irqchip before a trim marker */
1290 if (!irqd->chip && !tail)
1293 if (IS_ERR(irqd->chip)) {
1294 /* Only -ENOTCONN is a valid trim marker */
1295 if (PTR_ERR(irqd->chip) != -ENOTCONN)
1302 /* No trim marker, nothing to do */
1306 pr_info("IRQ%d: trimming hierarchy from %s\n",
1307 virq, tail->parent_data->domain->name);
1309 /* Sever the inner part of the hierarchy... */
1311 tail = tail->parent_data;
1312 irqd->parent_data = NULL;
1313 __irq_domain_free_hierarchy(tail);
1318 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1319 unsigned int virq, unsigned int nr_irqs)
1321 struct irq_data *irq_data;
1322 struct irq_domain *parent;
1325 /* The outermost irq_data is embedded in struct irq_desc */
1326 for (i = 0; i < nr_irqs; i++) {
1327 irq_data = irq_get_irq_data(virq + i);
1328 irq_data->domain = domain;
1330 for (parent = domain->parent; parent; parent = parent->parent) {
1331 irq_data = irq_domain_insert_irq_data(parent, irq_data);
1333 irq_domain_free_irq_data(virq, i + 1);
1343 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1344 * @domain: domain to match
1345 * @virq: IRQ number to get irq_data
1347 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1350 struct irq_data *irq_data;
1352 for (irq_data = irq_get_irq_data(virq); irq_data;
1353 irq_data = irq_data->parent_data)
1354 if (irq_data->domain == domain)
1359 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1362 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1363 * @domain: Interrupt domain to match
1365 * @hwirq: The hwirq number
1366 * @chip: The associated interrupt chip
1367 * @chip_data: The associated chip data
1369 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1370 irq_hw_number_t hwirq,
1371 const struct irq_chip *chip,
1374 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1379 irq_data->hwirq = hwirq;
1380 irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1381 irq_data->chip_data = chip_data;
1385 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1388 * irq_domain_set_info - Set the complete data for a @virq in @domain
1389 * @domain: Interrupt domain to match
1391 * @hwirq: The hardware interrupt number
1392 * @chip: The associated interrupt chip
1393 * @chip_data: The associated interrupt chip data
1394 * @handler: The interrupt flow handler
1395 * @handler_data: The interrupt flow handler data
1396 * @handler_name: The interrupt handler name
1398 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1399 irq_hw_number_t hwirq, const struct irq_chip *chip,
1400 void *chip_data, irq_flow_handler_t handler,
1401 void *handler_data, const char *handler_name)
1403 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1404 __irq_set_handler(virq, handler, 0, handler_name);
1405 irq_set_handler_data(virq, handler_data);
1407 EXPORT_SYMBOL(irq_domain_set_info);
1410 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1411 * @domain: Interrupt domain to match
1412 * @virq: IRQ number to start with
1413 * @nr_irqs: The number of irqs to free
1415 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1416 unsigned int nr_irqs)
1418 struct irq_data *irq_data;
1421 for (i = 0; i < nr_irqs; i++) {
1422 irq_data = irq_domain_get_irq_data(domain, virq + i);
1424 irq_domain_reset_irq_data(irq_data);
1426 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1428 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1431 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1432 * @domain: Interrupt domain to match
1433 * @virq: IRQ number to start with
1434 * @nr_irqs: The number of irqs to free
1436 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1437 unsigned int nr_irqs)
1441 for (i = 0; i < nr_irqs; i++) {
1442 irq_set_handler_data(virq + i, NULL);
1443 irq_set_handler(virq + i, NULL);
1445 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1448 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1449 unsigned int irq_base,
1450 unsigned int nr_irqs)
1454 if (!domain->ops->free)
1457 for (i = 0; i < nr_irqs; i++) {
1458 if (irq_domain_get_irq_data(domain, irq_base + i))
1459 domain->ops->free(domain, irq_base + i, 1);
1463 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1464 unsigned int irq_base,
1465 unsigned int nr_irqs, void *arg)
1467 if (!domain->ops->alloc) {
1468 pr_debug("domain->ops->alloc() is NULL\n");
1472 return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1475 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1476 unsigned int nr_irqs, int node, void *arg,
1477 bool realloc, const struct irq_affinity_desc *affinity)
1481 if (realloc && irq_base >= 0) {
1484 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1487 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1493 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1494 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1499 ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1501 goto out_free_irq_data;
1503 for (i = 0; i < nr_irqs; i++) {
1504 ret = irq_domain_trim_hierarchy(virq + i);
1506 goto out_free_irq_data;
1509 for (i = 0; i < nr_irqs; i++)
1510 irq_domain_insert_irq(virq + i);
1515 irq_domain_free_irq_data(virq, nr_irqs);
1517 irq_free_descs(virq, nr_irqs);
1522 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1523 * @domain: domain to allocate from
1524 * @irq_base: allocate specified IRQ number if irq_base >= 0
1525 * @nr_irqs: number of IRQs to allocate
1526 * @node: NUMA node id for memory allocation
1527 * @arg: domain specific argument
1528 * @realloc: IRQ descriptors have already been allocated if true
1529 * @affinity: Optional irq affinity mask for multiqueue devices
1531 * Allocate IRQ numbers and initialized all data structures to support
1532 * hierarchy IRQ domains.
1533 * Parameter @realloc is mainly to support legacy IRQs.
1534 * Returns error code or allocated IRQ number
1536 * The whole process to setup an IRQ has been split into two steps.
1537 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1538 * descriptor and required hardware resources. The second step,
1539 * irq_domain_activate_irq(), is to program the hardware with preallocated
1540 * resources. In this way, it's easier to rollback when failing to
1541 * allocate resources.
1543 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1544 unsigned int nr_irqs, int node, void *arg,
1545 bool realloc, const struct irq_affinity_desc *affinity)
1549 if (domain == NULL) {
1550 domain = irq_default_domain;
1551 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1555 mutex_lock(&domain->root->mutex);
1556 ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1558 mutex_unlock(&domain->root->mutex);
1562 EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1564 /* The irq_data was moved, fix the revmap to refer to the new location */
1565 static void irq_domain_fix_revmap(struct irq_data *d)
1569 lockdep_assert_held(&d->domain->root->mutex);
1571 if (irq_domain_is_nomap(d->domain))
1574 /* Fix up the revmap. */
1575 if (d->hwirq < d->domain->revmap_size) {
1576 /* Not using radix tree */
1577 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1579 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1581 radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1586 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1587 * @domain: Domain to push.
1588 * @virq: Irq to push the domain in to.
1589 * @arg: Passed to the irq_domain_ops alloc() function.
1591 * For an already existing irqdomain hierarchy, as might be obtained
1592 * via a call to pci_enable_msix(), add an additional domain to the
1593 * head of the processing chain. Must be called before request_irq()
1596 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1598 struct irq_data *irq_data = irq_get_irq_data(virq);
1599 struct irq_data *parent_irq_data;
1600 struct irq_desc *desc;
1604 * Check that no action has been set, which indicates the virq
1605 * is in a state where this function doesn't have to deal with
1606 * races between interrupt handling and maintaining the
1607 * hierarchy. This will catch gross misuse. Attempting to
1608 * make the check race free would require holding locks across
1609 * calls to struct irq_domain_ops->alloc(), which could lead
1610 * to deadlock, so we just do a simple check before starting.
1612 desc = irq_to_desc(virq);
1615 if (WARN_ON(desc->action))
1621 if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1627 if (domain->parent != irq_data->domain)
1630 parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1631 irq_data_get_node(irq_data));
1632 if (!parent_irq_data)
1635 mutex_lock(&domain->root->mutex);
1637 /* Copy the original irq_data. */
1638 *parent_irq_data = *irq_data;
1641 * Overwrite the irq_data, which is embedded in struct irq_desc, with
1642 * values for this domain.
1644 irq_data->parent_data = parent_irq_data;
1645 irq_data->domain = domain;
1647 irq_data->hwirq = 0;
1648 irq_data->chip = NULL;
1649 irq_data->chip_data = NULL;
1651 /* May (probably does) set hwirq, chip, etc. */
1652 rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1654 /* Restore the original irq_data. */
1655 *irq_data = *parent_irq_data;
1656 kfree(parent_irq_data);
1660 irq_domain_fix_revmap(parent_irq_data);
1661 irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
1663 mutex_unlock(&domain->root->mutex);
1667 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1670 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1671 * @domain: Domain to remove.
1672 * @virq: Irq to remove the domain from.
1674 * Undo the effects of a call to irq_domain_push_irq(). Must be
1675 * called either before request_irq() or after free_irq().
1677 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1679 struct irq_data *irq_data = irq_get_irq_data(virq);
1680 struct irq_data *parent_irq_data;
1681 struct irq_data *tmp_irq_data;
1682 struct irq_desc *desc;
1685 * Check that no action is set, which indicates the virq is in
1686 * a state where this function doesn't have to deal with races
1687 * between interrupt handling and maintaining the hierarchy.
1688 * This will catch gross misuse. Attempting to make the check
1689 * race free would require holding locks across calls to
1690 * struct irq_domain_ops->free(), which could lead to
1691 * deadlock, so we just do a simple check before starting.
1693 desc = irq_to_desc(virq);
1696 if (WARN_ON(desc->action))
1705 tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1707 /* We can only "pop" if this domain is at the top of the list */
1708 if (WARN_ON(irq_data != tmp_irq_data))
1711 if (WARN_ON(irq_data->domain != domain))
1714 parent_irq_data = irq_data->parent_data;
1715 if (WARN_ON(!parent_irq_data))
1718 mutex_lock(&domain->root->mutex);
1720 irq_data->parent_data = NULL;
1722 irq_domain_clear_mapping(domain, irq_data->hwirq);
1723 irq_domain_free_irqs_hierarchy(domain, virq, 1);
1725 /* Restore the original irq_data. */
1726 *irq_data = *parent_irq_data;
1728 irq_domain_fix_revmap(irq_data);
1730 mutex_unlock(&domain->root->mutex);
1732 kfree(parent_irq_data);
1736 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1739 * irq_domain_free_irqs - Free IRQ number and associated data structures
1740 * @virq: base IRQ number
1741 * @nr_irqs: number of IRQs to free
1743 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1745 struct irq_data *data = irq_get_irq_data(virq);
1746 struct irq_domain *domain;
1749 if (WARN(!data || !data->domain || !data->domain->ops->free,
1750 "NULL pointer, cannot free irq\n"))
1753 domain = data->domain;
1755 mutex_lock(&domain->root->mutex);
1756 for (i = 0; i < nr_irqs; i++)
1757 irq_domain_remove_irq(virq + i);
1758 irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
1759 mutex_unlock(&domain->root->mutex);
1761 irq_domain_free_irq_data(virq, nr_irqs);
1762 irq_free_descs(virq, nr_irqs);
1765 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq)
1767 if (irq_domain_is_msi_device(domain))
1768 msi_device_domain_free_wired(domain, virq);
1770 irq_domain_free_irqs(virq, 1);
1774 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1775 * @domain: Domain below which interrupts must be allocated
1776 * @irq_base: Base IRQ number
1777 * @nr_irqs: Number of IRQs to allocate
1778 * @arg: Allocation data (arch/domain specific)
1780 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1781 unsigned int irq_base, unsigned int nr_irqs,
1784 if (!domain->parent)
1787 return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1790 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1793 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1794 * @domain: Domain below which interrupts must be freed
1795 * @irq_base: Base IRQ number
1796 * @nr_irqs: Number of IRQs to free
1798 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1799 unsigned int irq_base, unsigned int nr_irqs)
1801 if (!domain->parent)
1804 irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1806 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1808 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1810 if (irq_data && irq_data->domain) {
1811 struct irq_domain *domain = irq_data->domain;
1813 if (domain->ops->deactivate)
1814 domain->ops->deactivate(domain, irq_data);
1815 if (irq_data->parent_data)
1816 __irq_domain_deactivate_irq(irq_data->parent_data);
1820 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1824 if (irqd && irqd->domain) {
1825 struct irq_domain *domain = irqd->domain;
1827 if (irqd->parent_data)
1828 ret = __irq_domain_activate_irq(irqd->parent_data,
1830 if (!ret && domain->ops->activate) {
1831 ret = domain->ops->activate(domain, irqd, reserve);
1832 /* Rollback in case of error */
1833 if (ret && irqd->parent_data)
1834 __irq_domain_deactivate_irq(irqd->parent_data);
1841 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1843 * @irq_data: Outermost irq_data associated with interrupt
1844 * @reserve: If set only reserve an interrupt vector instead of assigning one
1846 * This is the second step to call domain_ops->activate to program interrupt
1847 * controllers, so the interrupt could actually get delivered.
1849 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1853 if (!irqd_is_activated(irq_data))
1854 ret = __irq_domain_activate_irq(irq_data, reserve);
1856 irqd_set_activated(irq_data);
1861 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1862 * deactivate interrupt
1863 * @irq_data: outermost irq_data associated with interrupt
1865 * It calls domain_ops->deactivate to program interrupt controllers to disable
1866 * interrupt delivery.
1868 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1870 if (irqd_is_activated(irq_data)) {
1871 __irq_domain_deactivate_irq(irq_data);
1872 irqd_clr_activated(irq_data);
1876 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1878 /* Hierarchy irq_domains must implement callback alloc() */
1879 if (domain->ops->alloc)
1880 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1882 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1884 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1885 * @domain: domain to match
1886 * @virq: IRQ number to get irq_data
1888 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1891 struct irq_data *irq_data = irq_get_irq_data(virq);
1893 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1895 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1898 * irq_domain_set_info - Set the complete data for a @virq in @domain
1899 * @domain: Interrupt domain to match
1901 * @hwirq: The hardware interrupt number
1902 * @chip: The associated interrupt chip
1903 * @chip_data: The associated interrupt chip data
1904 * @handler: The interrupt flow handler
1905 * @handler_data: The interrupt flow handler data
1906 * @handler_name: The interrupt handler name
1908 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1909 irq_hw_number_t hwirq, const struct irq_chip *chip,
1910 void *chip_data, irq_flow_handler_t handler,
1911 void *handler_data, const char *handler_name)
1913 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1914 irq_set_chip_data(virq, chip_data);
1915 irq_set_handler_data(virq, handler_data);
1918 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1919 unsigned int nr_irqs, int node, void *arg,
1920 bool realloc, const struct irq_affinity_desc *affinity)
1925 static void irq_domain_check_hierarchy(struct irq_domain *domain) { }
1926 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq) { }
1928 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1930 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1931 #include "internals.h"
1933 static struct dentry *domain_dir;
1936 irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1938 seq_printf(m, "%*sname: %s\n", ind, "", d->name);
1939 seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size);
1940 seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1941 seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
1942 if (d->ops && d->ops->debug_show)
1943 d->ops->debug_show(m, d, NULL, ind + 1);
1944 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1947 seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1948 irq_domain_debug_show_one(m, d->parent, ind + 4);
1952 static int irq_domain_debug_show(struct seq_file *m, void *p)
1954 struct irq_domain *d = m->private;
1956 /* Default domain? Might be NULL */
1958 if (!irq_default_domain)
1960 d = irq_default_domain;
1962 irq_domain_debug_show_one(m, d, 0);
1965 DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1967 static void debugfs_add_domain_dir(struct irq_domain *d)
1969 if (!d->name || !domain_dir)
1971 debugfs_create_file(d->name, 0444, domain_dir, d,
1972 &irq_domain_debug_fops);
1975 static void debugfs_remove_domain_dir(struct irq_domain *d)
1977 debugfs_lookup_and_remove(d->name, domain_dir);
1980 void __init irq_domain_debugfs_init(struct dentry *root)
1982 struct irq_domain *d;
1984 domain_dir = debugfs_create_dir("domains", root);
1986 debugfs_create_file("default", 0444, domain_dir, NULL,
1987 &irq_domain_debug_fops);
1988 mutex_lock(&irq_domain_mutex);
1989 list_for_each_entry(d, &irq_domain_list, link)
1990 debugfs_add_domain_dir(d);
1991 mutex_unlock(&irq_domain_mutex);