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
114 * @fwnode: fwnode_handle to free
116 * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
118 void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
120 struct irqchip_fwid *fwid;
122 if (!fwnode || WARN_ON(!is_fwnode_irqchip(fwnode)))
125 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
129 EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
131 static int alloc_name(struct irq_domain *domain, char *base, enum irq_domain_bus_token bus_token)
133 if (bus_token == DOMAIN_BUS_ANY)
134 domain->name = kasprintf(GFP_KERNEL, "%s", base);
136 domain->name = kasprintf(GFP_KERNEL, "%s-%d", base, bus_token);
140 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
144 static int alloc_fwnode_name(struct irq_domain *domain, const struct fwnode_handle *fwnode,
145 enum irq_domain_bus_token bus_token, const char *suffix)
147 const char *sep = suffix ? "-" : "";
148 const char *suf = suffix ? : "";
151 if (bus_token == DOMAIN_BUS_ANY)
152 name = kasprintf(GFP_KERNEL, "%pfw%s%s", fwnode, sep, suf);
154 name = kasprintf(GFP_KERNEL, "%pfw%s%s-%d", fwnode, sep, suf, bus_token);
159 * fwnode paths contain '/', which debugfs is legitimately unhappy
160 * about. Replace them with ':', which does the trick and is not as
161 * offensive as '\'...
163 domain->name = strreplace(name, '/', ':');
164 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
168 static int alloc_unknown_name(struct irq_domain *domain, enum irq_domain_bus_token bus_token)
170 static atomic_t unknown_domains;
171 int id = atomic_inc_return(&unknown_domains);
173 if (bus_token == DOMAIN_BUS_ANY)
174 domain->name = kasprintf(GFP_KERNEL, "unknown-%d", id);
176 domain->name = kasprintf(GFP_KERNEL, "unknown-%d-%d", id, bus_token);
180 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
184 static int irq_domain_set_name(struct irq_domain *domain, const struct irq_domain_info *info)
186 enum irq_domain_bus_token bus_token = info->bus_token;
187 const struct fwnode_handle *fwnode = info->fwnode;
189 if (is_fwnode_irqchip(fwnode)) {
190 struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
193 * The name_suffix is only intended to be used to avoid a name
194 * collision when multiple domains are created for a single
195 * device and the name is picked using a real device node.
196 * (Typical use-case is regmap-IRQ controllers for devices
197 * providing more than one physical IRQ.) There should be no
198 * need to use name_suffix with irqchip-fwnode.
200 if (info->name_suffix)
203 switch (fwid->type) {
204 case IRQCHIP_FWNODE_NAMED:
205 case IRQCHIP_FWNODE_NAMED_ID:
206 return alloc_name(domain, fwid->name, bus_token);
208 domain->name = fwid->name;
209 if (bus_token != DOMAIN_BUS_ANY)
210 return alloc_name(domain, fwid->name, bus_token);
213 } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) || is_software_node(fwnode)) {
214 return alloc_fwnode_name(domain, fwnode, bus_token, info->name_suffix);
221 pr_err("Invalid fwnode type for irqdomain\n");
222 return alloc_unknown_name(domain, bus_token);
225 static struct irq_domain *__irq_domain_create(const struct irq_domain_info *info)
227 struct irq_domain *domain;
230 if (WARN_ON((info->size && info->direct_max) ||
231 (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && info->direct_max) ||
232 (info->direct_max && info->direct_max != info->hwirq_max)))
233 return ERR_PTR(-EINVAL);
235 domain = kzalloc_node(struct_size(domain, revmap, info->size),
236 GFP_KERNEL, of_node_to_nid(to_of_node(info->fwnode)));
238 return ERR_PTR(-ENOMEM);
240 err = irq_domain_set_name(domain, info);
246 domain->fwnode = fwnode_handle_get(info->fwnode);
247 fwnode_dev_initialized(domain->fwnode, true);
250 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
251 domain->ops = info->ops;
252 domain->host_data = info->host_data;
253 domain->bus_token = info->bus_token;
254 domain->hwirq_max = info->hwirq_max;
256 if (info->direct_max)
257 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
259 domain->revmap_size = info->size;
262 * Hierarchical domains use the domain lock of the root domain
263 * (innermost domain).
265 * For non-hierarchical domains (as for root domains), the root
266 * pointer is set to the domain itself so that &domain->root->mutex
267 * always points to the right lock.
269 mutex_init(&domain->mutex);
270 domain->root = domain;
272 irq_domain_check_hierarchy(domain);
277 static void __irq_domain_publish(struct irq_domain *domain)
279 mutex_lock(&irq_domain_mutex);
280 debugfs_add_domain_dir(domain);
281 list_add(&domain->link, &irq_domain_list);
282 mutex_unlock(&irq_domain_mutex);
284 pr_debug("Added domain %s\n", domain->name);
287 static void irq_domain_free(struct irq_domain *domain)
289 fwnode_dev_initialized(domain->fwnode, false);
290 fwnode_handle_put(domain->fwnode);
291 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
296 static void irq_domain_instantiate_descs(const struct irq_domain_info *info)
298 if (!IS_ENABLED(CONFIG_SPARSE_IRQ))
301 if (irq_alloc_descs(info->virq_base, info->virq_base, info->size,
302 of_node_to_nid(to_of_node(info->fwnode))) < 0) {
303 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
308 static struct irq_domain *__irq_domain_instantiate(const struct irq_domain_info *info,
309 bool cond_alloc_descs, bool force_associate)
311 struct irq_domain *domain;
314 domain = __irq_domain_create(info);
318 domain->flags |= info->domain_flags;
319 domain->exit = info->exit;
321 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
323 domain->root = info->parent->root;
324 domain->parent = info->parent;
328 if (info->dgc_info) {
329 err = irq_domain_alloc_generic_chips(domain, info->dgc_info);
331 goto err_domain_free;
335 err = info->init(domain);
337 goto err_domain_gc_remove;
340 __irq_domain_publish(domain);
342 if (cond_alloc_descs && info->virq_base > 0)
343 irq_domain_instantiate_descs(info);
346 * Legacy interrupt domains have a fixed Linux interrupt number
347 * associated. Other interrupt domains can request association by
348 * providing a Linux interrupt number > 0.
350 if (force_associate || info->virq_base > 0) {
351 irq_domain_associate_many(domain, info->virq_base, info->hwirq_base,
352 info->size - info->hwirq_base);
357 err_domain_gc_remove:
359 irq_domain_remove_generic_chips(domain);
361 irq_domain_free(domain);
366 * irq_domain_instantiate() - Instantiate a new irq domain data structure
367 * @info: Domain information pointer pointing to the information for this domain
369 * Return: A pointer to the instantiated irq domain or an ERR_PTR value.
371 struct irq_domain *irq_domain_instantiate(const struct irq_domain_info *info)
373 return __irq_domain_instantiate(info, false, false);
375 EXPORT_SYMBOL_GPL(irq_domain_instantiate);
378 * irq_domain_remove() - Remove an irq domain.
379 * @domain: domain to remove
381 * This routine is used to remove an irq domain. The caller must ensure
382 * that all mappings within the domain have been disposed of prior to
383 * use, depending on the revmap type.
385 void irq_domain_remove(struct irq_domain *domain)
388 domain->exit(domain);
390 mutex_lock(&irq_domain_mutex);
391 debugfs_remove_domain_dir(domain);
393 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
395 list_del(&domain->link);
398 * If the going away domain is the default one, reset it.
400 if (unlikely(irq_default_domain == domain))
401 irq_set_default_host(NULL);
403 mutex_unlock(&irq_domain_mutex);
405 if (domain->flags & IRQ_DOMAIN_FLAG_DESTROY_GC)
406 irq_domain_remove_generic_chips(domain);
408 pr_debug("Removed domain %s\n", domain->name);
409 irq_domain_free(domain);
411 EXPORT_SYMBOL_GPL(irq_domain_remove);
413 void irq_domain_update_bus_token(struct irq_domain *domain,
414 enum irq_domain_bus_token bus_token)
418 if (domain->bus_token == bus_token)
421 mutex_lock(&irq_domain_mutex);
423 domain->bus_token = bus_token;
425 name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
427 mutex_unlock(&irq_domain_mutex);
431 debugfs_remove_domain_dir(domain);
433 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
436 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
439 debugfs_add_domain_dir(domain);
441 mutex_unlock(&irq_domain_mutex);
443 EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
446 * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
447 * @fwnode: firmware node for the interrupt controller
448 * @size: total number of irqs in mapping
449 * @first_irq: first number of irq block assigned to the domain,
450 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
451 * pre-map all of the irqs in the domain to virqs starting at first_irq.
452 * @ops: domain callbacks
453 * @host_data: Controller private data pointer
455 * Allocates an irq_domain, and optionally if first_irq is positive then also
456 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
458 * This is intended to implement the expected behaviour for most
459 * interrupt controllers. If device tree is used, then first_irq will be 0 and
460 * irqs get mapped dynamically on the fly. However, if the controller requires
461 * static virq assignments (non-DT boot) then it will set that up correctly.
463 struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
465 unsigned int first_irq,
466 const struct irq_domain_ops *ops,
469 struct irq_domain_info info = {
473 .virq_base = first_irq,
475 .host_data = host_data,
477 struct irq_domain *domain = __irq_domain_instantiate(&info, true, false);
479 return IS_ERR(domain) ? NULL : domain;
481 EXPORT_SYMBOL_GPL(irq_domain_create_simple);
484 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
485 * @of_node: pointer to interrupt controller's device tree node.
486 * @size: total number of irqs in legacy mapping
487 * @first_irq: first number of irq block assigned to the domain
488 * @first_hwirq: first hwirq number to use for the translation. Should normally
489 * be '0', but a positive integer can be used if the effective
490 * hwirqs numbering does not begin at zero.
491 * @ops: map/unmap domain callbacks
492 * @host_data: Controller private data pointer
494 * Note: the map() callback will be called before this function returns
495 * for all legacy interrupts except 0 (which is always the invalid irq for
496 * a legacy controller).
498 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
500 unsigned int first_irq,
501 irq_hw_number_t first_hwirq,
502 const struct irq_domain_ops *ops,
505 return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
506 first_irq, first_hwirq, ops, host_data);
508 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
510 struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
512 unsigned int first_irq,
513 irq_hw_number_t first_hwirq,
514 const struct irq_domain_ops *ops,
517 struct irq_domain_info info = {
519 .size = first_hwirq + size,
520 .hwirq_max = first_hwirq + size,
521 .hwirq_base = first_hwirq,
522 .virq_base = first_irq,
524 .host_data = host_data,
526 struct irq_domain *domain = __irq_domain_instantiate(&info, false, true);
528 return IS_ERR(domain) ? NULL : domain;
530 EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
533 * irq_find_matching_fwspec() - Locates a domain for a given fwspec
534 * @fwspec: FW specifier for an interrupt
535 * @bus_token: domain-specific data
537 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
538 enum irq_domain_bus_token bus_token)
540 struct irq_domain *h, *found = NULL;
541 struct fwnode_handle *fwnode = fwspec->fwnode;
545 * We might want to match the legacy controller last since
546 * it might potentially be set to match all interrupts in
547 * the absence of a device node. This isn't a problem so far
550 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
551 * values must generate an exact match for the domain to be
554 mutex_lock(&irq_domain_mutex);
555 list_for_each_entry(h, &irq_domain_list, link) {
556 if (h->ops->select && bus_token != DOMAIN_BUS_ANY)
557 rc = h->ops->select(h, fwspec, bus_token);
558 else if (h->ops->match)
559 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
561 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
562 ((bus_token == DOMAIN_BUS_ANY) ||
563 (h->bus_token == bus_token)));
570 mutex_unlock(&irq_domain_mutex);
573 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
576 * irq_set_default_host() - Set a "default" irq domain
577 * @domain: default domain pointer
579 * For convenience, it's possible to set a "default" domain that will be used
580 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
581 * platforms that want to manipulate a few hard coded interrupt numbers that
582 * aren't properly represented in the device-tree.
584 void irq_set_default_host(struct irq_domain *domain)
586 pr_debug("Default domain set to @0x%p\n", domain);
588 irq_default_domain = domain;
590 EXPORT_SYMBOL_GPL(irq_set_default_host);
593 * irq_get_default_host() - Retrieve the "default" irq domain
595 * Returns: the default domain, if any.
597 * Modern code should never use this. This should only be used on
598 * systems that cannot implement a firmware->fwnode mapping (which
599 * both DT and ACPI provide).
601 struct irq_domain *irq_get_default_host(void)
603 return irq_default_domain;
605 EXPORT_SYMBOL_GPL(irq_get_default_host);
607 static bool irq_domain_is_nomap(struct irq_domain *domain)
609 return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
610 (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
613 static void irq_domain_clear_mapping(struct irq_domain *domain,
614 irq_hw_number_t hwirq)
616 lockdep_assert_held(&domain->root->mutex);
618 if (irq_domain_is_nomap(domain))
621 if (hwirq < domain->revmap_size)
622 rcu_assign_pointer(domain->revmap[hwirq], NULL);
624 radix_tree_delete(&domain->revmap_tree, hwirq);
627 static void irq_domain_set_mapping(struct irq_domain *domain,
628 irq_hw_number_t hwirq,
629 struct irq_data *irq_data)
632 * This also makes sure that all domains point to the same root when
633 * called from irq_domain_insert_irq() for each domain in a hierarchy.
635 lockdep_assert_held(&domain->root->mutex);
637 if (irq_domain_is_nomap(domain))
640 if (hwirq < domain->revmap_size)
641 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
643 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
646 static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
648 struct irq_data *irq_data = irq_get_irq_data(irq);
649 irq_hw_number_t hwirq;
651 if (WARN(!irq_data || irq_data->domain != domain,
652 "virq%i doesn't exist; cannot disassociate\n", irq))
655 hwirq = irq_data->hwirq;
657 mutex_lock(&domain->root->mutex);
659 irq_set_status_flags(irq, IRQ_NOREQUEST);
661 /* remove chip and handler */
662 irq_set_chip_and_handler(irq, NULL, NULL);
664 /* Make sure it's completed */
665 synchronize_irq(irq);
667 /* Tell the PIC about it */
668 if (domain->ops->unmap)
669 domain->ops->unmap(domain, irq);
672 irq_data->domain = NULL;
676 /* Clear reverse map for this hwirq */
677 irq_domain_clear_mapping(domain, hwirq);
679 mutex_unlock(&domain->root->mutex);
682 static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
683 irq_hw_number_t hwirq)
685 struct irq_data *irq_data = irq_get_irq_data(virq);
688 if (WARN(hwirq >= domain->hwirq_max,
689 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
691 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
693 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
696 irq_data->hwirq = hwirq;
697 irq_data->domain = domain;
698 if (domain->ops->map) {
699 ret = domain->ops->map(domain, virq, hwirq);
702 * If map() returns -EPERM, this interrupt is protected
703 * by the firmware or some other service and shall not
704 * be mapped. Don't bother telling the user about it.
707 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
708 domain->name, hwirq, virq, ret);
710 irq_data->domain = NULL;
717 irq_domain_set_mapping(domain, hwirq, irq_data);
719 irq_clear_status_flags(virq, IRQ_NOREQUEST);
724 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
725 irq_hw_number_t hwirq)
729 mutex_lock(&domain->root->mutex);
730 ret = irq_domain_associate_locked(domain, virq, hwirq);
731 mutex_unlock(&domain->root->mutex);
735 EXPORT_SYMBOL_GPL(irq_domain_associate);
737 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
738 irq_hw_number_t hwirq_base, int count)
740 struct device_node *of_node;
743 of_node = irq_domain_get_of_node(domain);
744 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
745 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
747 for (i = 0; i < count; i++)
748 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
750 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
752 #ifdef CONFIG_IRQ_DOMAIN_NOMAP
754 * irq_create_direct_mapping() - Allocate an irq for direct mapping
755 * @domain: domain to allocate the irq for or NULL for default domain
757 * This routine is used for irq controllers which can choose the hardware
758 * interrupt numbers they generate. In such a case it's simplest to use
759 * the linux irq as the hardware interrupt number. It still uses the linear
760 * or radix tree to store the mapping, but the irq controller can optimize
761 * the revmap path by using the hwirq directly.
763 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
765 struct device_node *of_node;
769 domain = irq_default_domain;
771 of_node = irq_domain_get_of_node(domain);
772 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
774 pr_debug("create_direct virq allocation failed\n");
777 if (virq >= domain->hwirq_max) {
778 pr_err("ERROR: no free irqs available below %lu maximum\n",
783 pr_debug("create_direct obtained virq %d\n", virq);
785 if (irq_domain_associate(domain, virq, virq)) {
792 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
795 static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
796 irq_hw_number_t hwirq,
797 const struct irq_affinity_desc *affinity)
799 struct device_node *of_node = irq_domain_get_of_node(domain);
802 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
804 /* Allocate a virtual interrupt number */
805 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
808 pr_debug("-> virq allocation failed\n");
812 if (irq_domain_associate_locked(domain, virq, hwirq)) {
817 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
818 hwirq, of_node_full_name(of_node), virq);
824 * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
825 * @domain: domain owning this hardware interrupt or NULL for default domain
826 * @hwirq: hardware irq number in that domain space
827 * @affinity: irq affinity
829 * Only one mapping per hardware interrupt is permitted. Returns a linux
831 * If the sense/trigger is to be specified, set_irq_type() should be called
832 * on the number returned from that call.
834 unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
835 irq_hw_number_t hwirq,
836 const struct irq_affinity_desc *affinity)
840 /* Look for default domain if necessary */
842 domain = irq_default_domain;
843 if (domain == NULL) {
844 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
848 mutex_lock(&domain->root->mutex);
850 /* Check if mapping already exists */
851 virq = irq_find_mapping(domain, hwirq);
853 pr_debug("existing mapping on virq %d\n", virq);
857 virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
859 mutex_unlock(&domain->root->mutex);
863 EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
865 static int irq_domain_translate(struct irq_domain *d,
866 struct irq_fwspec *fwspec,
867 irq_hw_number_t *hwirq, unsigned int *type)
869 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
870 if (d->ops->translate)
871 return d->ops->translate(d, fwspec, hwirq, type);
874 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
875 fwspec->param, fwspec->param_count,
878 /* If domain has no translation, then we assume interrupt line */
879 *hwirq = fwspec->param[0];
883 void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
884 unsigned int count, struct irq_fwspec *fwspec)
888 fwspec->fwnode = of_node_to_fwnode(np);
889 fwspec->param_count = count;
891 for (i = 0; i < count; i++)
892 fwspec->param[i] = args[i];
894 EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
896 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
898 struct irq_domain *domain;
899 struct irq_data *irq_data;
900 irq_hw_number_t hwirq;
901 unsigned int type = IRQ_TYPE_NONE;
904 if (fwspec->fwnode) {
905 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
907 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
909 domain = irq_default_domain;
913 pr_warn("no irq domain found for %s !\n",
914 of_node_full_name(to_of_node(fwspec->fwnode)));
918 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
922 * WARN if the irqchip returns a type with bits
923 * outside the sense mask set and clear these bits.
925 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
926 type &= IRQ_TYPE_SENSE_MASK;
928 mutex_lock(&domain->root->mutex);
931 * If we've already configured this interrupt,
932 * don't do it again, or hell will break loose.
934 virq = irq_find_mapping(domain, hwirq);
937 * If the trigger type is not specified or matches the
938 * current trigger type then we are done so return the
941 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
945 * If the trigger type has not been set yet, then set
946 * it now and return the interrupt number.
948 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
949 irq_data = irq_get_irq_data(virq);
955 irqd_set_trigger_type(irq_data, type);
959 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
960 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
965 if (irq_domain_is_hierarchy(domain)) {
966 if (irq_domain_is_msi_device(domain)) {
967 mutex_unlock(&domain->root->mutex);
968 virq = msi_device_domain_alloc_wired(domain, hwirq, type);
969 mutex_lock(&domain->root->mutex);
971 virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
972 fwspec, false, NULL);
979 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
984 irq_data = irq_get_irq_data(virq);
985 if (WARN_ON(!irq_data)) {
990 /* Store trigger type */
991 irqd_set_trigger_type(irq_data, type);
993 mutex_unlock(&domain->root->mutex);
997 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
999 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
1001 struct irq_fwspec fwspec;
1003 of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
1004 irq_data->args_count, &fwspec);
1006 return irq_create_fwspec_mapping(&fwspec);
1008 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
1011 * irq_dispose_mapping() - Unmap an interrupt
1012 * @virq: linux irq number of the interrupt to unmap
1014 void irq_dispose_mapping(unsigned int virq)
1016 struct irq_data *irq_data;
1017 struct irq_domain *domain;
1019 irq_data = virq ? irq_get_irq_data(virq) : NULL;
1023 domain = irq_data->domain;
1024 if (WARN_ON(domain == NULL))
1027 if (irq_domain_is_hierarchy(domain)) {
1028 irq_domain_free_one_irq(domain, virq);
1030 irq_domain_disassociate(domain, virq);
1031 irq_free_desc(virq);
1034 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
1037 * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
1038 * @domain: domain owning this hardware interrupt
1039 * @hwirq: hardware irq number in that domain space
1040 * @irq: optional pointer to return the Linux irq if required
1042 * Returns the interrupt descriptor.
1044 struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
1045 irq_hw_number_t hwirq,
1048 struct irq_desc *desc = NULL;
1049 struct irq_data *data;
1051 /* Look for default domain if necessary */
1053 domain = irq_default_domain;
1057 if (irq_domain_is_nomap(domain)) {
1058 if (hwirq < domain->hwirq_max) {
1059 data = irq_domain_get_irq_data(domain, hwirq);
1060 if (data && data->hwirq == hwirq)
1061 desc = irq_data_to_desc(data);
1070 /* Check if the hwirq is in the linear revmap. */
1071 if (hwirq < domain->revmap_size)
1072 data = rcu_dereference(domain->revmap[hwirq]);
1074 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
1077 desc = irq_data_to_desc(data);
1085 EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
1088 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
1089 * @d: Interrupt domain involved in the translation
1090 * @ctrlr: The device tree node for the device whose interrupt is translated
1091 * @intspec: The interrupt specifier data from the device tree
1092 * @intsize: The number of entries in @intspec
1093 * @out_hwirq: Pointer to storage for the hardware interrupt number
1094 * @out_type: Pointer to storage for the interrupt type
1096 * Device Tree IRQ specifier translation function which works with one cell
1097 * bindings where the cell value maps directly to the hwirq number.
1099 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
1100 const u32 *intspec, unsigned int intsize,
1101 unsigned long *out_hwirq, unsigned int *out_type)
1103 if (WARN_ON(intsize < 1))
1105 *out_hwirq = intspec[0];
1106 *out_type = IRQ_TYPE_NONE;
1109 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
1112 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1113 * @d: Interrupt domain involved in the translation
1114 * @ctrlr: The device tree node for the device whose interrupt is translated
1115 * @intspec: The interrupt specifier data from the device tree
1116 * @intsize: The number of entries in @intspec
1117 * @out_hwirq: Pointer to storage for the hardware interrupt number
1118 * @out_type: Pointer to storage for the interrupt type
1120 * Device Tree IRQ specifier translation function which works with two cell
1121 * bindings where the cell values map directly to the hwirq number
1122 * and linux irq flags.
1124 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1125 const u32 *intspec, unsigned int intsize,
1126 irq_hw_number_t *out_hwirq, unsigned int *out_type)
1128 struct irq_fwspec fwspec;
1130 of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1131 return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1133 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1136 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1137 * @d: Interrupt domain involved in the translation
1138 * @ctrlr: The device tree node for the device whose interrupt is translated
1139 * @intspec: The interrupt specifier data from the device tree
1140 * @intsize: The number of entries in @intspec
1141 * @out_hwirq: Pointer to storage for the hardware interrupt number
1142 * @out_type: Pointer to storage for the interrupt type
1144 * Device Tree IRQ specifier translation function which works with either one
1145 * or two cell bindings where the cell values map directly to the hwirq number
1146 * and linux irq flags.
1148 * Note: don't use this function unless your interrupt controller explicitly
1149 * supports both one and two cell bindings. For the majority of controllers
1150 * the _onecell() or _twocell() variants above should be used.
1152 int irq_domain_xlate_onetwocell(struct irq_domain *d,
1153 struct device_node *ctrlr,
1154 const u32 *intspec, unsigned int intsize,
1155 unsigned long *out_hwirq, unsigned int *out_type)
1157 if (WARN_ON(intsize < 1))
1159 *out_hwirq = intspec[0];
1161 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1163 *out_type = IRQ_TYPE_NONE;
1166 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1168 const struct irq_domain_ops irq_domain_simple_ops = {
1169 .xlate = irq_domain_xlate_onetwocell,
1171 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1174 * irq_domain_translate_onecell() - Generic translate for direct one cell
1176 * @d: Interrupt domain involved in the translation
1177 * @fwspec: The firmware interrupt specifier to translate
1178 * @out_hwirq: Pointer to storage for the hardware interrupt number
1179 * @out_type: Pointer to storage for the interrupt type
1181 int irq_domain_translate_onecell(struct irq_domain *d,
1182 struct irq_fwspec *fwspec,
1183 unsigned long *out_hwirq,
1184 unsigned int *out_type)
1186 if (WARN_ON(fwspec->param_count < 1))
1188 *out_hwirq = fwspec->param[0];
1189 *out_type = IRQ_TYPE_NONE;
1192 EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1195 * irq_domain_translate_twocell() - Generic translate for direct two cell
1197 * @d: Interrupt domain involved in the translation
1198 * @fwspec: The firmware interrupt specifier to translate
1199 * @out_hwirq: Pointer to storage for the hardware interrupt number
1200 * @out_type: Pointer to storage for the interrupt type
1202 * Device Tree IRQ specifier translation function which works with two cell
1203 * bindings where the cell values map directly to the hwirq number
1204 * and linux irq flags.
1206 int irq_domain_translate_twocell(struct irq_domain *d,
1207 struct irq_fwspec *fwspec,
1208 unsigned long *out_hwirq,
1209 unsigned int *out_type)
1211 if (WARN_ON(fwspec->param_count < 2))
1213 *out_hwirq = fwspec->param[0];
1214 *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1217 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1219 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1220 int node, const struct irq_affinity_desc *affinity)
1225 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1228 hint = hwirq % irq_get_nr_irqs();
1231 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1233 if (virq <= 0 && hint > 1) {
1234 virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1243 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1244 * @irq_data: The pointer to irq_data
1246 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1248 irq_data->hwirq = 0;
1249 irq_data->chip = &no_irq_chip;
1250 irq_data->chip_data = NULL;
1252 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1254 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1256 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1257 * @parent: Parent irq domain to associate with the new domain
1258 * @flags: Irq domain flags associated to the domain
1259 * @size: Size of the domain. See below
1260 * @fwnode: Optional fwnode of the interrupt controller
1261 * @ops: Pointer to the interrupt domain callbacks
1262 * @host_data: Controller private data pointer
1264 * If @size is 0 a tree domain is created, otherwise a linear domain.
1266 * If successful the parent is associated to the new domain and the
1267 * domain flags are set.
1268 * Returns pointer to IRQ domain, or NULL on failure.
1270 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1273 struct fwnode_handle *fwnode,
1274 const struct irq_domain_ops *ops,
1277 struct irq_domain_info info = {
1282 .host_data = host_data,
1283 .domain_flags = flags,
1286 struct irq_domain *d;
1289 info.hwirq_max = ~0U;
1291 d = irq_domain_instantiate(&info);
1292 return IS_ERR(d) ? NULL : d;
1294 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1296 static void irq_domain_insert_irq(int virq)
1298 struct irq_data *data;
1300 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1301 struct irq_domain *domain = data->domain;
1304 irq_domain_set_mapping(domain, data->hwirq, data);
1307 irq_clear_status_flags(virq, IRQ_NOREQUEST);
1310 static void irq_domain_remove_irq(int virq)
1312 struct irq_data *data;
1314 irq_set_status_flags(virq, IRQ_NOREQUEST);
1315 irq_set_chip_and_handler(virq, NULL, NULL);
1316 synchronize_irq(virq);
1319 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1320 struct irq_domain *domain = data->domain;
1321 irq_hw_number_t hwirq = data->hwirq;
1324 irq_domain_clear_mapping(domain, hwirq);
1328 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1329 struct irq_data *child)
1331 struct irq_data *irq_data;
1333 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1334 irq_data_get_node(child));
1336 child->parent_data = irq_data;
1337 irq_data->irq = child->irq;
1338 irq_data->common = child->common;
1339 irq_data->domain = domain;
1345 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1347 struct irq_data *tmp;
1351 irq_data = irq_data->parent_data;
1356 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1358 struct irq_data *irq_data, *tmp;
1361 for (i = 0; i < nr_irqs; i++) {
1362 irq_data = irq_get_irq_data(virq + i);
1363 tmp = irq_data->parent_data;
1364 irq_data->parent_data = NULL;
1365 irq_data->domain = NULL;
1367 __irq_domain_free_hierarchy(tmp);
1372 * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1373 * @domain: IRQ domain from which the hierarchy is to be disconnected
1374 * @virq: IRQ number where the hierarchy is to be trimmed
1376 * Marks the @virq level belonging to @domain as disconnected.
1377 * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1380 * Its only use is to be able to trim levels of hierarchy that do not
1381 * have any real meaning for this interrupt, and that the driver marks
1382 * as such from its .alloc() callback.
1384 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1387 struct irq_data *irqd;
1389 irqd = irq_domain_get_irq_data(domain, virq);
1393 irqd->chip = ERR_PTR(-ENOTCONN);
1396 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1398 static int irq_domain_trim_hierarchy(unsigned int virq)
1400 struct irq_data *tail, *irqd, *irq_data;
1402 irq_data = irq_get_irq_data(virq);
1405 /* The first entry must have a valid irqchip */
1406 if (IS_ERR_OR_NULL(irq_data->chip))
1410 * Validate that the irq_data chain is sane in the presence of
1411 * a hierarchy trimming marker.
1413 for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1414 /* Can't have a valid irqchip after a trim marker */
1415 if (irqd->chip && tail)
1418 /* Can't have an empty irqchip before a trim marker */
1419 if (!irqd->chip && !tail)
1422 if (IS_ERR(irqd->chip)) {
1423 /* Only -ENOTCONN is a valid trim marker */
1424 if (PTR_ERR(irqd->chip) != -ENOTCONN)
1431 /* No trim marker, nothing to do */
1435 pr_info("IRQ%d: trimming hierarchy from %s\n",
1436 virq, tail->parent_data->domain->name);
1438 /* Sever the inner part of the hierarchy... */
1440 tail = tail->parent_data;
1441 irqd->parent_data = NULL;
1442 __irq_domain_free_hierarchy(tail);
1447 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1448 unsigned int virq, unsigned int nr_irqs)
1450 struct irq_data *irq_data;
1451 struct irq_domain *parent;
1454 /* The outermost irq_data is embedded in struct irq_desc */
1455 for (i = 0; i < nr_irqs; i++) {
1456 irq_data = irq_get_irq_data(virq + i);
1457 irq_data->domain = domain;
1459 for (parent = domain->parent; parent; parent = parent->parent) {
1460 irq_data = irq_domain_insert_irq_data(parent, irq_data);
1462 irq_domain_free_irq_data(virq, i + 1);
1472 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1473 * @domain: domain to match
1474 * @virq: IRQ number to get irq_data
1476 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1479 struct irq_data *irq_data;
1481 for (irq_data = irq_get_irq_data(virq); irq_data;
1482 irq_data = irq_data->parent_data)
1483 if (irq_data->domain == domain)
1488 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1491 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1492 * @domain: Interrupt domain to match
1494 * @hwirq: The hwirq number
1495 * @chip: The associated interrupt chip
1496 * @chip_data: The associated chip data
1498 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1499 irq_hw_number_t hwirq,
1500 const struct irq_chip *chip,
1503 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1508 irq_data->hwirq = hwirq;
1509 irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1510 irq_data->chip_data = chip_data;
1514 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1517 * irq_domain_set_info - Set the complete data for a @virq in @domain
1518 * @domain: Interrupt domain to match
1520 * @hwirq: The hardware interrupt number
1521 * @chip: The associated interrupt chip
1522 * @chip_data: The associated interrupt chip data
1523 * @handler: The interrupt flow handler
1524 * @handler_data: The interrupt flow handler data
1525 * @handler_name: The interrupt handler name
1527 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1528 irq_hw_number_t hwirq, const struct irq_chip *chip,
1529 void *chip_data, irq_flow_handler_t handler,
1530 void *handler_data, const char *handler_name)
1532 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1533 __irq_set_handler(virq, handler, 0, handler_name);
1534 irq_set_handler_data(virq, handler_data);
1536 EXPORT_SYMBOL(irq_domain_set_info);
1539 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1540 * @domain: Interrupt domain to match
1541 * @virq: IRQ number to start with
1542 * @nr_irqs: The number of irqs to free
1544 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1545 unsigned int nr_irqs)
1547 struct irq_data *irq_data;
1550 for (i = 0; i < nr_irqs; i++) {
1551 irq_data = irq_domain_get_irq_data(domain, virq + i);
1553 irq_domain_reset_irq_data(irq_data);
1555 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1557 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1560 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1561 * @domain: Interrupt domain to match
1562 * @virq: IRQ number to start with
1563 * @nr_irqs: The number of irqs to free
1565 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1566 unsigned int nr_irqs)
1570 for (i = 0; i < nr_irqs; i++) {
1571 irq_set_handler_data(virq + i, NULL);
1572 irq_set_handler(virq + i, NULL);
1574 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1577 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1578 unsigned int irq_base,
1579 unsigned int nr_irqs)
1583 if (!domain->ops->free)
1586 for (i = 0; i < nr_irqs; i++) {
1587 if (irq_domain_get_irq_data(domain, irq_base + i))
1588 domain->ops->free(domain, irq_base + i, 1);
1592 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1593 unsigned int irq_base,
1594 unsigned int nr_irqs, void *arg)
1596 if (!domain->ops->alloc) {
1597 pr_debug("domain->ops->alloc() is NULL\n");
1601 return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1604 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1605 unsigned int nr_irqs, int node, void *arg,
1606 bool realloc, const struct irq_affinity_desc *affinity)
1610 if (realloc && irq_base >= 0) {
1613 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1616 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1622 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1623 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1628 ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1630 goto out_free_irq_data;
1632 for (i = 0; i < nr_irqs; i++) {
1633 ret = irq_domain_trim_hierarchy(virq + i);
1635 goto out_free_irq_data;
1638 for (i = 0; i < nr_irqs; i++)
1639 irq_domain_insert_irq(virq + i);
1644 irq_domain_free_irq_data(virq, nr_irqs);
1646 irq_free_descs(virq, nr_irqs);
1651 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1652 * @domain: domain to allocate from
1653 * @irq_base: allocate specified IRQ number if irq_base >= 0
1654 * @nr_irqs: number of IRQs to allocate
1655 * @node: NUMA node id for memory allocation
1656 * @arg: domain specific argument
1657 * @realloc: IRQ descriptors have already been allocated if true
1658 * @affinity: Optional irq affinity mask for multiqueue devices
1660 * Allocate IRQ numbers and initialized all data structures to support
1661 * hierarchy IRQ domains.
1662 * Parameter @realloc is mainly to support legacy IRQs.
1663 * Returns error code or allocated IRQ number
1665 * The whole process to setup an IRQ has been split into two steps.
1666 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1667 * descriptor and required hardware resources. The second step,
1668 * irq_domain_activate_irq(), is to program the hardware with preallocated
1669 * resources. In this way, it's easier to rollback when failing to
1670 * allocate resources.
1672 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1673 unsigned int nr_irqs, int node, void *arg,
1674 bool realloc, const struct irq_affinity_desc *affinity)
1678 if (domain == NULL) {
1679 domain = irq_default_domain;
1680 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1684 mutex_lock(&domain->root->mutex);
1685 ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1687 mutex_unlock(&domain->root->mutex);
1691 EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1693 /* The irq_data was moved, fix the revmap to refer to the new location */
1694 static void irq_domain_fix_revmap(struct irq_data *d)
1698 lockdep_assert_held(&d->domain->root->mutex);
1700 if (irq_domain_is_nomap(d->domain))
1703 /* Fix up the revmap. */
1704 if (d->hwirq < d->domain->revmap_size) {
1705 /* Not using radix tree */
1706 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1708 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1710 radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1715 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1716 * @domain: Domain to push.
1717 * @virq: Irq to push the domain in to.
1718 * @arg: Passed to the irq_domain_ops alloc() function.
1720 * For an already existing irqdomain hierarchy, as might be obtained
1721 * via a call to pci_enable_msix(), add an additional domain to the
1722 * head of the processing chain. Must be called before request_irq()
1725 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1727 struct irq_data *irq_data = irq_get_irq_data(virq);
1728 struct irq_data *parent_irq_data;
1729 struct irq_desc *desc;
1733 * Check that no action has been set, which indicates the virq
1734 * is in a state where this function doesn't have to deal with
1735 * races between interrupt handling and maintaining the
1736 * hierarchy. This will catch gross misuse. Attempting to
1737 * make the check race free would require holding locks across
1738 * calls to struct irq_domain_ops->alloc(), which could lead
1739 * to deadlock, so we just do a simple check before starting.
1741 desc = irq_to_desc(virq);
1744 if (WARN_ON(desc->action))
1750 if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1756 if (domain->parent != irq_data->domain)
1759 parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1760 irq_data_get_node(irq_data));
1761 if (!parent_irq_data)
1764 mutex_lock(&domain->root->mutex);
1766 /* Copy the original irq_data. */
1767 *parent_irq_data = *irq_data;
1770 * Overwrite the irq_data, which is embedded in struct irq_desc, with
1771 * values for this domain.
1773 irq_data->parent_data = parent_irq_data;
1774 irq_data->domain = domain;
1776 irq_data->hwirq = 0;
1777 irq_data->chip = NULL;
1778 irq_data->chip_data = NULL;
1780 /* May (probably does) set hwirq, chip, etc. */
1781 rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1783 /* Restore the original irq_data. */
1784 *irq_data = *parent_irq_data;
1785 kfree(parent_irq_data);
1789 irq_domain_fix_revmap(parent_irq_data);
1790 irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
1792 mutex_unlock(&domain->root->mutex);
1796 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1799 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1800 * @domain: Domain to remove.
1801 * @virq: Irq to remove the domain from.
1803 * Undo the effects of a call to irq_domain_push_irq(). Must be
1804 * called either before request_irq() or after free_irq().
1806 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1808 struct irq_data *irq_data = irq_get_irq_data(virq);
1809 struct irq_data *parent_irq_data;
1810 struct irq_data *tmp_irq_data;
1811 struct irq_desc *desc;
1814 * Check that no action is set, which indicates the virq is in
1815 * a state where this function doesn't have to deal with races
1816 * between interrupt handling and maintaining the hierarchy.
1817 * This will catch gross misuse. Attempting to make the check
1818 * race free would require holding locks across calls to
1819 * struct irq_domain_ops->free(), which could lead to
1820 * deadlock, so we just do a simple check before starting.
1822 desc = irq_to_desc(virq);
1825 if (WARN_ON(desc->action))
1834 tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1836 /* We can only "pop" if this domain is at the top of the list */
1837 if (WARN_ON(irq_data != tmp_irq_data))
1840 if (WARN_ON(irq_data->domain != domain))
1843 parent_irq_data = irq_data->parent_data;
1844 if (WARN_ON(!parent_irq_data))
1847 mutex_lock(&domain->root->mutex);
1849 irq_data->parent_data = NULL;
1851 irq_domain_clear_mapping(domain, irq_data->hwirq);
1852 irq_domain_free_irqs_hierarchy(domain, virq, 1);
1854 /* Restore the original irq_data. */
1855 *irq_data = *parent_irq_data;
1857 irq_domain_fix_revmap(irq_data);
1859 mutex_unlock(&domain->root->mutex);
1861 kfree(parent_irq_data);
1865 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1868 * irq_domain_free_irqs - Free IRQ number and associated data structures
1869 * @virq: base IRQ number
1870 * @nr_irqs: number of IRQs to free
1872 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1874 struct irq_data *data = irq_get_irq_data(virq);
1875 struct irq_domain *domain;
1878 if (WARN(!data || !data->domain || !data->domain->ops->free,
1879 "NULL pointer, cannot free irq\n"))
1882 domain = data->domain;
1884 mutex_lock(&domain->root->mutex);
1885 for (i = 0; i < nr_irqs; i++)
1886 irq_domain_remove_irq(virq + i);
1887 irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
1888 mutex_unlock(&domain->root->mutex);
1890 irq_domain_free_irq_data(virq, nr_irqs);
1891 irq_free_descs(virq, nr_irqs);
1894 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq)
1896 if (irq_domain_is_msi_device(domain))
1897 msi_device_domain_free_wired(domain, virq);
1899 irq_domain_free_irqs(virq, 1);
1903 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1904 * @domain: Domain below which interrupts must be allocated
1905 * @irq_base: Base IRQ number
1906 * @nr_irqs: Number of IRQs to allocate
1907 * @arg: Allocation data (arch/domain specific)
1909 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1910 unsigned int irq_base, unsigned int nr_irqs,
1913 if (!domain->parent)
1916 return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1919 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1922 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1923 * @domain: Domain below which interrupts must be freed
1924 * @irq_base: Base IRQ number
1925 * @nr_irqs: Number of IRQs to free
1927 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1928 unsigned int irq_base, unsigned int nr_irqs)
1930 if (!domain->parent)
1933 irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1935 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1937 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1939 if (irq_data && irq_data->domain) {
1940 struct irq_domain *domain = irq_data->domain;
1942 if (domain->ops->deactivate)
1943 domain->ops->deactivate(domain, irq_data);
1944 if (irq_data->parent_data)
1945 __irq_domain_deactivate_irq(irq_data->parent_data);
1949 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1953 if (irqd && irqd->domain) {
1954 struct irq_domain *domain = irqd->domain;
1956 if (irqd->parent_data)
1957 ret = __irq_domain_activate_irq(irqd->parent_data,
1959 if (!ret && domain->ops->activate) {
1960 ret = domain->ops->activate(domain, irqd, reserve);
1961 /* Rollback in case of error */
1962 if (ret && irqd->parent_data)
1963 __irq_domain_deactivate_irq(irqd->parent_data);
1970 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1972 * @irq_data: Outermost irq_data associated with interrupt
1973 * @reserve: If set only reserve an interrupt vector instead of assigning one
1975 * This is the second step to call domain_ops->activate to program interrupt
1976 * controllers, so the interrupt could actually get delivered.
1978 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1982 if (!irqd_is_activated(irq_data))
1983 ret = __irq_domain_activate_irq(irq_data, reserve);
1985 irqd_set_activated(irq_data);
1990 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1991 * deactivate interrupt
1992 * @irq_data: outermost irq_data associated with interrupt
1994 * It calls domain_ops->deactivate to program interrupt controllers to disable
1995 * interrupt delivery.
1997 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1999 if (irqd_is_activated(irq_data)) {
2000 __irq_domain_deactivate_irq(irq_data);
2001 irqd_clr_activated(irq_data);
2005 static void irq_domain_check_hierarchy(struct irq_domain *domain)
2007 /* Hierarchy irq_domains must implement callback alloc() */
2008 if (domain->ops->alloc)
2009 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
2011 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
2013 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
2014 * @domain: domain to match
2015 * @virq: IRQ number to get irq_data
2017 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
2020 struct irq_data *irq_data = irq_get_irq_data(virq);
2022 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
2024 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
2027 * irq_domain_set_info - Set the complete data for a @virq in @domain
2028 * @domain: Interrupt domain to match
2030 * @hwirq: The hardware interrupt number
2031 * @chip: The associated interrupt chip
2032 * @chip_data: The associated interrupt chip data
2033 * @handler: The interrupt flow handler
2034 * @handler_data: The interrupt flow handler data
2035 * @handler_name: The interrupt handler name
2037 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
2038 irq_hw_number_t hwirq, const struct irq_chip *chip,
2039 void *chip_data, irq_flow_handler_t handler,
2040 void *handler_data, const char *handler_name)
2042 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
2043 irq_set_chip_data(virq, chip_data);
2044 irq_set_handler_data(virq, handler_data);
2047 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
2048 unsigned int nr_irqs, int node, void *arg,
2049 bool realloc, const struct irq_affinity_desc *affinity)
2054 static void irq_domain_check_hierarchy(struct irq_domain *domain) { }
2055 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq) { }
2057 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
2059 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
2060 #include "internals.h"
2062 static struct dentry *domain_dir;
2064 static const struct irq_bit_descr irqdomain_flags[] = {
2065 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_HIERARCHY),
2066 BIT_MASK_DESCR(IRQ_DOMAIN_NAME_ALLOCATED),
2067 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_IPI_PER_CPU),
2068 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_IPI_SINGLE),
2069 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI),
2070 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_ISOLATED_MSI),
2071 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_NO_MAP),
2072 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI_PARENT),
2073 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_MSI_DEVICE),
2074 BIT_MASK_DESCR(IRQ_DOMAIN_FLAG_NONCORE),
2077 static void irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
2079 seq_printf(m, "%*sname: %s\n", ind, "", d->name);
2080 seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size);
2081 seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
2082 seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
2083 irq_debug_show_bits(m, ind, d->flags, irqdomain_flags, ARRAY_SIZE(irqdomain_flags));
2084 if (d->ops && d->ops->debug_show)
2085 d->ops->debug_show(m, d, NULL, ind + 1);
2086 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
2089 seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
2090 irq_domain_debug_show_one(m, d->parent, ind + 4);
2094 static int irq_domain_debug_show(struct seq_file *m, void *p)
2096 struct irq_domain *d = m->private;
2098 /* Default domain? Might be NULL */
2100 if (!irq_default_domain)
2102 d = irq_default_domain;
2104 irq_domain_debug_show_one(m, d, 0);
2107 DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
2109 static void debugfs_add_domain_dir(struct irq_domain *d)
2111 if (!d->name || !domain_dir)
2113 debugfs_create_file(d->name, 0444, domain_dir, d,
2114 &irq_domain_debug_fops);
2117 static void debugfs_remove_domain_dir(struct irq_domain *d)
2119 debugfs_lookup_and_remove(d->name, domain_dir);
2122 void __init irq_domain_debugfs_init(struct dentry *root)
2124 struct irq_domain *d;
2126 domain_dir = debugfs_create_dir("domains", root);
2128 debugfs_create_file("default", 0444, domain_dir, NULL,
2129 &irq_domain_debug_fops);
2130 mutex_lock(&irq_domain_mutex);
2131 list_for_each_entry(d, &irq_domain_list, link)
2132 debugfs_add_domain_dir(d);
2133 mutex_unlock(&irq_domain_mutex);