1// SPDX-License-Identifier: GPL-2.0
   2
   3#define pr_fmt(fmt)  "irq: " fmt
   4
   5#include <linux/acpi.h>
   6#include <linux/debugfs.h>
   7#include <linux/hardirq.h>
   8#include <linux/interrupt.h>
   9#include <linux/irq.h>
  10#include <linux/irqdesc.h>
  11#include <linux/irqdomain.h>
  12#include <linux/module.h>
  13#include <linux/mutex.h>
  14#include <linux/of.h>
  15#include <linux/of_address.h>
  16#include <linux/of_irq.h>
  17#include <linux/topology.h>
  18#include <linux/seq_file.h>
  19#include <linux/slab.h>
  20#include <linux/smp.h>
  21#include <linux/fs.h>
  22
  23static LIST_HEAD(irq_domain_list);
  24static DEFINE_MUTEX(irq_domain_mutex);
  25
  26static struct irq_domain *irq_default_domain;
  27
  28static 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);
  31static void irq_domain_check_hierarchy(struct irq_domain *domain);
  32static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq);
  33
  34struct irqchip_fwid {
  35	struct fwnode_handle	fwnode;
  36	unsigned int		type;
  37	char			*name;
  38	phys_addr_t		*pa;
  39};
  40
  41#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
  42static void debugfs_add_domain_dir(struct irq_domain *d);
  43static void debugfs_remove_domain_dir(struct irq_domain *d);
  44#else
  45static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
  46static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
  47#endif
  48
  49static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
  50{
  51	struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
  52
  53	return fwid->name;
  54}
  55
  56const struct fwnode_operations irqchip_fwnode_ops = {
  57	.get_name = irqchip_fwnode_get_name,
  58};
  59EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
  60
  61/**
  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
  68 *
  69 * Allocate a struct irqchip_fwid, and return a pointer to the embedded
  70 * fwnode_handle (or NULL on failure).
  71 *
  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
  75 * domain struct.
  76 */
  77struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
  78						const char *name,
  79						phys_addr_t *pa)
  80{
  81	struct irqchip_fwid *fwid;
  82	char *n;
  83
  84	fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
  85
  86	switch (type) {
  87	case IRQCHIP_FWNODE_NAMED:
  88		n = kasprintf(GFP_KERNEL, "%s", name);
  89		break;
  90	case IRQCHIP_FWNODE_NAMED_ID:
  91		n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
  92		break;
  93	default:
  94		n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
  95		break;
  96	}
  97
  98	if (!fwid || !n) {
  99		kfree(fwid);
 100		kfree(n);
 101		return NULL;
 102	}
 103
 104	fwid->type = type;
 105	fwid->name = n;
 106	fwid->pa = pa;
 107	fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
 108	return &fwid->fwnode;
 109}
 110EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
 111
 112/**
 113 * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
 114 *
 115 * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
 116 */
 117void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
 118{
 119	struct irqchip_fwid *fwid;
 120
 121	if (!fwnode || WARN_ON(!is_fwnode_irqchip(fwnode)))
 122		return;
 123
 124	fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
 125	kfree(fwid->name);
 126	kfree(fwid);
 127}
 128EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
 129
 130static struct irq_domain *__irq_domain_create(struct fwnode_handle *fwnode,
 131					      unsigned int size,
 132					      irq_hw_number_t hwirq_max,
 133					      int direct_max,
 134					      const struct irq_domain_ops *ops,
 135					      void *host_data)
 136{
 137	struct irqchip_fwid *fwid;
 138	struct irq_domain *domain;
 139
 140	static atomic_t unknown_domains;
 141
 142	if (WARN_ON((size && direct_max) ||
 143		    (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max) ||
 144		    (direct_max && (direct_max != hwirq_max))))
 145		return NULL;
 146
 147	domain = kzalloc_node(struct_size(domain, revmap, size),
 148			      GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
 149	if (!domain)
 150		return NULL;
 151
 152	if (is_fwnode_irqchip(fwnode)) {
 153		fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
 154
 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);
 160			if (!domain->name) {
 161				kfree(domain);
 162				return NULL;
 163			}
 164			domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 165			break;
 166		default:
 167			domain->fwnode = fwnode;
 168			domain->name = fwid->name;
 169			break;
 170		}
 171	} else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
 172		   is_software_node(fwnode)) {
 173		char *name;
 174
 175		/*
 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 '\'...
 179		 */
 180		name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
 181		if (!name) {
 182			kfree(domain);
 183			return NULL;
 184		}
 185
 186		domain->name = strreplace(name, '/', ':');
 187		domain->fwnode = fwnode;
 188		domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 189	}
 190
 191	if (!domain->name) {
 192		if (fwnode)
 193			pr_err("Invalid fwnode type for irqdomain\n");
 194		domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
 195					 atomic_inc_return(&unknown_domains));
 196		if (!domain->name) {
 197			kfree(domain);
 198			return NULL;
 199		}
 200		domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 201	}
 202
 203	fwnode_handle_get(fwnode);
 204	fwnode_dev_initialized(fwnode, true);
 205
 206	/* Fill structure */
 207	INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
 208	domain->ops = ops;
 209	domain->host_data = host_data;
 210	domain->hwirq_max = hwirq_max;
 211
 212	if (direct_max)
 213		domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
 214
 215	domain->revmap_size = size;
 216
 217	/*
 218	 * Hierarchical domains use the domain lock of the root domain
 219	 * (innermost domain).
 220	 *
 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.
 224	 */
 225	mutex_init(&domain->mutex);
 226	domain->root = domain;
 227
 228	irq_domain_check_hierarchy(domain);
 229
 230	return domain;
 231}
 232
 233static void __irq_domain_publish(struct irq_domain *domain)
 234{
 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);
 239
 240	pr_debug("Added domain %s\n", domain->name);
 241}
 242
 243/**
 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
 249 *              direct mapping
 250 * @ops: domain callbacks
 251 * @host_data: Controller private data pointer
 252 *
 253 * Allocates and initializes an irq_domain structure.
 254 * Returns pointer to IRQ domain, or NULL on failure.
 255 */
 256struct 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,
 259				    void *host_data)
 260{
 261	struct irq_domain *domain;
 262
 263	domain = __irq_domain_create(fwnode, size, hwirq_max, direct_max,
 264				     ops, host_data);
 265	if (domain)
 266		__irq_domain_publish(domain);
 267
 268	return domain;
 269}
 270EXPORT_SYMBOL_GPL(__irq_domain_add);
 271
 272/**
 273 * irq_domain_remove() - Remove an irq domain.
 274 * @domain: domain to remove
 275 *
 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.
 279 */
 280void irq_domain_remove(struct irq_domain *domain)
 281{
 282	mutex_lock(&irq_domain_mutex);
 283	debugfs_remove_domain_dir(domain);
 284
 285	WARN_ON(!radix_tree_empty(&domain->revmap_tree));
 286
 287	list_del(&domain->link);
 288
 289	/*
 290	 * If the going away domain is the default one, reset it.
 291	 */
 292	if (unlikely(irq_default_domain == domain))
 293		irq_set_default_host(NULL);
 294
 295	mutex_unlock(&irq_domain_mutex);
 296
 297	pr_debug("Removed domain %s\n", domain->name);
 298
 299	fwnode_dev_initialized(domain->fwnode, false);
 300	fwnode_handle_put(domain->fwnode);
 301	if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
 302		kfree(domain->name);
 303	kfree(domain);
 304}
 305EXPORT_SYMBOL_GPL(irq_domain_remove);
 306
 307void irq_domain_update_bus_token(struct irq_domain *domain,
 308				 enum irq_domain_bus_token bus_token)
 309{
 310	char *name;
 311
 312	if (domain->bus_token == bus_token)
 313		return;
 314
 315	mutex_lock(&irq_domain_mutex);
 316
 317	domain->bus_token = bus_token;
 318
 319	name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
 320	if (!name) {
 321		mutex_unlock(&irq_domain_mutex);
 322		return;
 323	}
 324
 325	debugfs_remove_domain_dir(domain);
 326
 327	if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
 328		kfree(domain->name);
 329	else
 330		domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 331
 332	domain->name = name;
 333	debugfs_add_domain_dir(domain);
 334
 335	mutex_unlock(&irq_domain_mutex);
 336}
 337EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
 338
 339/**
 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
 348 *
 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.
 351 *
 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.
 356 */
 357struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
 358					    unsigned int size,
 359					    unsigned int first_irq,
 360					    const struct irq_domain_ops *ops,
 361					    void *host_data)
 362{
 363	struct irq_domain *domain;
 364
 365	domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data);
 366	if (!domain)
 367		return NULL;
 368
 369	if (first_irq > 0) {
 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)));
 374			if (rc < 0)
 375				pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
 376					first_irq);
 377		}
 378		irq_domain_associate_many(domain, first_irq, 0, size);
 379	}
 380
 381	return domain;
 382}
 383EXPORT_SYMBOL_GPL(irq_domain_create_simple);
 384
 385/**
 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
 395 *
 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).
 399 */
 400struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 401					 unsigned int size,
 402					 unsigned int first_irq,
 403					 irq_hw_number_t first_hwirq,
 404					 const struct irq_domain_ops *ops,
 405					 void *host_data)
 406{
 407	return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
 408					first_irq, first_hwirq, ops, host_data);
 409}
 410EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 411
 412struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
 413					 unsigned int size,
 414					 unsigned int first_irq,
 415					 irq_hw_number_t first_hwirq,
 416					 const struct irq_domain_ops *ops,
 417					 void *host_data)
 418{
 419	struct irq_domain *domain;
 420
 421	domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
 422	if (domain)
 423		irq_domain_associate_many(domain, first_irq, first_hwirq, size);
 424
 425	return domain;
 426}
 427EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
 428
 429/**
 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
 433 */
 434struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
 435					    enum irq_domain_bus_token bus_token)
 436{
 437	struct irq_domain *h, *found = NULL;
 438	struct fwnode_handle *fwnode = fwspec->fwnode;
 439	int rc;
 440
 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
 444	 * yet though...
 445	 *
 446	 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
 447	 * values must generate an exact match for the domain to be
 448	 * selected.
 449	 */
 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);
 456		else
 457			rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
 458			      ((bus_token == DOMAIN_BUS_ANY) ||
 459			       (h->bus_token == bus_token)));
 460
 461		if (rc) {
 462			found = h;
 463			break;
 464		}
 465	}
 466	mutex_unlock(&irq_domain_mutex);
 467	return found;
 468}
 469EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
 470
 471/**
 472 * irq_set_default_host() - Set a "default" irq domain
 473 * @domain: default domain pointer
 474 *
 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.
 479 */
 480void irq_set_default_host(struct irq_domain *domain)
 481{
 482	pr_debug("Default domain set to @0x%p\n", domain);
 483
 484	irq_default_domain = domain;
 485}
 486EXPORT_SYMBOL_GPL(irq_set_default_host);
 487
 488/**
 489 * irq_get_default_host() - Retrieve the "default" irq domain
 490 *
 491 * Returns: the default domain, if any.
 492 *
 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).
 496 */
 497struct irq_domain *irq_get_default_host(void)
 498{
 499	return irq_default_domain;
 500}
 501EXPORT_SYMBOL_GPL(irq_get_default_host);
 502
 503static bool irq_domain_is_nomap(struct irq_domain *domain)
 504{
 505	return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
 506	       (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
 507}
 508
 509static void irq_domain_clear_mapping(struct irq_domain *domain,
 510				     irq_hw_number_t hwirq)
 511{
 512	lockdep_assert_held(&domain->root->mutex);
 513
 514	if (irq_domain_is_nomap(domain))
 515		return;
 516
 517	if (hwirq < domain->revmap_size)
 518		rcu_assign_pointer(domain->revmap[hwirq], NULL);
 519	else
 520		radix_tree_delete(&domain->revmap_tree, hwirq);
 521}
 522
 523static void irq_domain_set_mapping(struct irq_domain *domain,
 524				   irq_hw_number_t hwirq,
 525				   struct irq_data *irq_data)
 526{
 527	/*
 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.
 530	 */
 531	lockdep_assert_held(&domain->root->mutex);
 532
 533	if (irq_domain_is_nomap(domain))
 534		return;
 535
 536	if (hwirq < domain->revmap_size)
 537		rcu_assign_pointer(domain->revmap[hwirq], irq_data);
 538	else
 539		radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
 540}
 541
 542static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
 543{
 544	struct irq_data *irq_data = irq_get_irq_data(irq);
 545	irq_hw_number_t hwirq;
 546
 547	if (WARN(!irq_data || irq_data->domain != domain,
 548		 "virq%i doesn't exist; cannot disassociate\n", irq))
 549		return;
 550
 551	hwirq = irq_data->hwirq;
 552
 553	mutex_lock(&domain->root->mutex);
 554
 555	irq_set_status_flags(irq, IRQ_NOREQUEST);
 556
 557	/* remove chip and handler */
 558	irq_set_chip_and_handler(irq, NULL, NULL);
 559
 560	/* Make sure it's completed */
 561	synchronize_irq(irq);
 562
 563	/* Tell the PIC about it */
 564	if (domain->ops->unmap)
 565		domain->ops->unmap(domain, irq);
 566	smp_mb();
 567
 568	irq_data->domain = NULL;
 569	irq_data->hwirq = 0;
 570	domain->mapcount--;
 571
 572	/* Clear reverse map for this hwirq */
 573	irq_domain_clear_mapping(domain, hwirq);
 574
 575	mutex_unlock(&domain->root->mutex);
 576}
 577
 578static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
 579				       irq_hw_number_t hwirq)
 580{
 581	struct irq_data *irq_data = irq_get_irq_data(virq);
 582	int ret;
 583
 584	if (WARN(hwirq >= domain->hwirq_max,
 585		 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
 586		return -EINVAL;
 587	if (WARN(!irq_data, "error: virq%i is not allocated", virq))
 588		return -EINVAL;
 589	if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
 590		return -EINVAL;
 591
 592	irq_data->hwirq = hwirq;
 593	irq_data->domain = domain;
 594	if (domain->ops->map) {
 595		ret = domain->ops->map(domain, virq, hwirq);
 596		if (ret != 0) {
 597			/*
 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.
 601			 */
 602			if (ret != -EPERM) {
 603				pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
 604				       domain->name, hwirq, virq, ret);
 605			}
 606			irq_data->domain = NULL;
 607			irq_data->hwirq = 0;
 608			return ret;
 609		}
 610	}
 611
 612	domain->mapcount++;
 613	irq_domain_set_mapping(domain, hwirq, irq_data);
 614
 615	irq_clear_status_flags(virq, IRQ_NOREQUEST);
 616
 617	return 0;
 618}
 619
 620int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
 621			 irq_hw_number_t hwirq)
 622{
 623	int ret;
 624
 625	mutex_lock(&domain->root->mutex);
 626	ret = irq_domain_associate_locked(domain, virq, hwirq);
 627	mutex_unlock(&domain->root->mutex);
 628
 629	return ret;
 630}
 631EXPORT_SYMBOL_GPL(irq_domain_associate);
 632
 633void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 634			       irq_hw_number_t hwirq_base, int count)
 635{
 636	struct device_node *of_node;
 637	int i;
 638
 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);
 642
 643	for (i = 0; i < count; i++)
 644		irq_domain_associate(domain, irq_base + i, hwirq_base + i);
 645}
 646EXPORT_SYMBOL_GPL(irq_domain_associate_many);
 647
 648#ifdef CONFIG_IRQ_DOMAIN_NOMAP
 649/**
 650 * irq_create_direct_mapping() - Allocate an irq for direct mapping
 651 * @domain: domain to allocate the irq for or NULL for default domain
 652 *
 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.
 658 */
 659unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 660{
 661	struct device_node *of_node;
 662	unsigned int virq;
 663
 664	if (domain == NULL)
 665		domain = irq_default_domain;
 666
 667	of_node = irq_domain_get_of_node(domain);
 668	virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
 669	if (!virq) {
 670		pr_debug("create_direct virq allocation failed\n");
 671		return 0;
 672	}
 673	if (virq >= domain->hwirq_max) {
 674		pr_err("ERROR: no free irqs available below %lu maximum\n",
 675			domain->hwirq_max);
 676		irq_free_desc(virq);
 677		return 0;
 678	}
 679	pr_debug("create_direct obtained virq %d\n", virq);
 680
 681	if (irq_domain_associate(domain, virq, virq)) {
 682		irq_free_desc(virq);
 683		return 0;
 684	}
 685
 686	return virq;
 687}
 688EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
 689#endif
 690
 691static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
 692						       irq_hw_number_t hwirq,
 693						       const struct irq_affinity_desc *affinity)
 694{
 695	struct device_node *of_node = irq_domain_get_of_node(domain);
 696	int virq;
 697
 698	pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
 699
 700	/* Allocate a virtual interrupt number */
 701	virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
 702				      affinity);
 703	if (virq <= 0) {
 704		pr_debug("-> virq allocation failed\n");
 705		return 0;
 706	}
 707
 708	if (irq_domain_associate_locked(domain, virq, hwirq)) {
 709		irq_free_desc(virq);
 710		return 0;
 711	}
 712
 713	pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
 714		hwirq, of_node_full_name(of_node), virq);
 715
 716	return virq;
 717}
 718
 719/**
 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
 724 *
 725 * Only one mapping per hardware interrupt is permitted. Returns a linux
 726 * irq number.
 727 * If the sense/trigger is to be specified, set_irq_type() should be called
 728 * on the number returned from that call.
 729 */
 730unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
 731					 irq_hw_number_t hwirq,
 732					 const struct irq_affinity_desc *affinity)
 733{
 734	int virq;
 735
 736	/* Look for default domain if necessary */
 737	if (domain == NULL)
 738		domain = irq_default_domain;
 739	if (domain == NULL) {
 740		WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
 741		return 0;
 742	}
 743
 744	mutex_lock(&domain->root->mutex);
 745
 746	/* Check if mapping already exists */
 747	virq = irq_find_mapping(domain, hwirq);
 748	if (virq) {
 749		pr_debug("existing mapping on virq %d\n", virq);
 750		goto out;
 751	}
 752
 753	virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
 754out:
 755	mutex_unlock(&domain->root->mutex);
 756
 757	return virq;
 758}
 759EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
 760
 761static int irq_domain_translate(struct irq_domain *d,
 762				struct irq_fwspec *fwspec,
 763				irq_hw_number_t *hwirq, unsigned int *type)
 764{
 765#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 766	if (d->ops->translate)
 767		return d->ops->translate(d, fwspec, hwirq, type);
 768#endif
 769	if (d->ops->xlate)
 770		return d->ops->xlate(d, to_of_node(fwspec->fwnode),
 771				     fwspec->param, fwspec->param_count,
 772				     hwirq, type);
 773
 774	/* If domain has no translation, then we assume interrupt line */
 775	*hwirq = fwspec->param[0];
 776	return 0;
 777}
 778
 779void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
 780			       unsigned int count, struct irq_fwspec *fwspec)
 781{
 782	int i;
 783
 784	fwspec->fwnode = of_node_to_fwnode(np);
 785	fwspec->param_count = count;
 786
 787	for (i = 0; i < count; i++)
 788		fwspec->param[i] = args[i];
 789}
 790EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
 791
 792unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
 793{
 794	struct irq_domain *domain;
 795	struct irq_data *irq_data;
 796	irq_hw_number_t hwirq;
 797	unsigned int type = IRQ_TYPE_NONE;
 798	int virq;
 799
 800	if (fwspec->fwnode) {
 801		domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
 802		if (!domain)
 803			domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
 804	} else {
 805		domain = irq_default_domain;
 806	}
 807
 808	if (!domain) {
 809		pr_warn("no irq domain found for %s !\n",
 810			of_node_full_name(to_of_node(fwspec->fwnode)));
 811		return 0;
 812	}
 813
 814	if (irq_domain_translate(domain, fwspec, &hwirq, &type))
 815		return 0;
 816
 817	/*
 818	 * WARN if the irqchip returns a type with bits
 819	 * outside the sense mask set and clear these bits.
 820	 */
 821	if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
 822		type &= IRQ_TYPE_SENSE_MASK;
 823
 824	mutex_lock(&domain->root->mutex);
 825
 826	/*
 827	 * If we've already configured this interrupt,
 828	 * don't do it again, or hell will break loose.
 829	 */
 830	virq = irq_find_mapping(domain, hwirq);
 831	if (virq) {
 832		/*
 833		 * If the trigger type is not specified or matches the
 834		 * current trigger type then we are done so return the
 835		 * interrupt number.
 836		 */
 837		if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
 838			goto out;
 839
 840		/*
 841		 * If the trigger type has not been set yet, then set
 842		 * it now and return the interrupt number.
 843		 */
 844		if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
 845			irq_data = irq_get_irq_data(virq);
 846			if (!irq_data) {
 847				virq = 0;
 848				goto out;
 849			}
 850
 851			irqd_set_trigger_type(irq_data, type);
 852			goto out;
 853		}
 854
 855		pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
 856			hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
 857		virq = 0;
 858		goto out;
 859	}
 860
 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);
 866		} else
 867			virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
 868							    fwspec, false, NULL);
 869		if (virq <= 0) {
 870			virq = 0;
 871			goto out;
 872		}
 873	} else {
 874		/* Create mapping */
 875		virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
 876		if (!virq)
 877			goto out;
 878	}
 879
 880	irq_data = irq_get_irq_data(virq);
 881	if (WARN_ON(!irq_data)) {
 882		virq = 0;
 883		goto out;
 884	}
 885
 886	/* Store trigger type */
 887	irqd_set_trigger_type(irq_data, type);
 888out:
 889	mutex_unlock(&domain->root->mutex);
 890
 891	return virq;
 892}
 893EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
 894
 895unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
 896{
 897	struct irq_fwspec fwspec;
 898
 899	of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
 900				  irq_data->args_count, &fwspec);
 901
 902	return irq_create_fwspec_mapping(&fwspec);
 903}
 904EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 905
 906/**
 907 * irq_dispose_mapping() - Unmap an interrupt
 908 * @virq: linux irq number of the interrupt to unmap
 909 */
 910void irq_dispose_mapping(unsigned int virq)
 911{
 912	struct irq_data *irq_data = irq_get_irq_data(virq);
 913	struct irq_domain *domain;
 914
 915	if (!virq || !irq_data)
 916		return;
 917
 918	domain = irq_data->domain;
 919	if (WARN_ON(domain == NULL))
 920		return;
 921
 922	if (irq_domain_is_hierarchy(domain)) {
 923		irq_domain_free_one_irq(domain, virq);
 924	} else {
 925		irq_domain_disassociate(domain, virq);
 926		irq_free_desc(virq);
 927	}
 928}
 929EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 930
 931/**
 932 * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
 933 * @domain: domain owning this hardware interrupt
 934 * @hwirq: hardware irq number in that domain space
 935 * @irq: optional pointer to return the Linux irq if required
 936 *
 937 * Returns the interrupt descriptor.
 938 */
 939struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
 940				       irq_hw_number_t hwirq,
 941				       unsigned int *irq)
 942{
 943	struct irq_desc *desc = NULL;
 944	struct irq_data *data;
 945
 946	/* Look for default domain if necessary */
 947	if (domain == NULL)
 948		domain = irq_default_domain;
 949	if (domain == NULL)
 950		return desc;
 951
 952	if (irq_domain_is_nomap(domain)) {
 953		if (hwirq < domain->hwirq_max) {
 954			data = irq_domain_get_irq_data(domain, hwirq);
 955			if (data && data->hwirq == hwirq)
 956				desc = irq_data_to_desc(data);
 957			if (irq && desc)
 958				*irq = hwirq;
 959		}
 960
 961		return desc;
 962	}
 963
 964	rcu_read_lock();
 965	/* Check if the hwirq is in the linear revmap. */
 966	if (hwirq < domain->revmap_size)
 967		data = rcu_dereference(domain->revmap[hwirq]);
 968	else
 969		data = radix_tree_lookup(&domain->revmap_tree, hwirq);
 970
 971	if (likely(data)) {
 972		desc = irq_data_to_desc(data);
 973		if (irq)
 974			*irq = data->irq;
 975	}
 976
 977	rcu_read_unlock();
 978	return desc;
 979}
 980EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
 981
 982/**
 983 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
 984 *
 985 * Device Tree IRQ specifier translation function which works with one cell
 986 * bindings where the cell value maps directly to the hwirq number.
 987 */
 988int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
 989			     const u32 *intspec, unsigned int intsize,
 990			     unsigned long *out_hwirq, unsigned int *out_type)
 991{
 992	if (WARN_ON(intsize < 1))
 993		return -EINVAL;
 994	*out_hwirq = intspec[0];
 995	*out_type = IRQ_TYPE_NONE;
 996	return 0;
 997}
 998EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
 999
1000/**
1001 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1002 *
1003 * Device Tree IRQ specifier translation function which works with two cell
1004 * bindings where the cell values map directly to the hwirq number
1005 * and linux irq flags.
1006 */
1007int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1008			const u32 *intspec, unsigned int intsize,
1009			irq_hw_number_t *out_hwirq, unsigned int *out_type)
1010{
1011	struct irq_fwspec fwspec;
1012
1013	of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1014	return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1015}
1016EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1017
1018/**
1019 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1020 *
1021 * Device Tree IRQ specifier translation function which works with either one
1022 * or two cell bindings where the cell values map directly to the hwirq number
1023 * and linux irq flags.
1024 *
1025 * Note: don't use this function unless your interrupt controller explicitly
1026 * supports both one and two cell bindings.  For the majority of controllers
1027 * the _onecell() or _twocell() variants above should be used.
1028 */
1029int irq_domain_xlate_onetwocell(struct irq_domain *d,
1030				struct device_node *ctrlr,
1031				const u32 *intspec, unsigned int intsize,
1032				unsigned long *out_hwirq, unsigned int *out_type)
1033{
1034	if (WARN_ON(intsize < 1))
1035		return -EINVAL;
1036	*out_hwirq = intspec[0];
1037	if (intsize > 1)
1038		*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1039	else
1040		*out_type = IRQ_TYPE_NONE;
1041	return 0;
1042}
1043EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1044
1045const struct irq_domain_ops irq_domain_simple_ops = {
1046	.xlate = irq_domain_xlate_onetwocell,
1047};
1048EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1049
1050/**
1051 * irq_domain_translate_onecell() - Generic translate for direct one cell
1052 * bindings
1053 */
1054int irq_domain_translate_onecell(struct irq_domain *d,
1055				 struct irq_fwspec *fwspec,
1056				 unsigned long *out_hwirq,
1057				 unsigned int *out_type)
1058{
1059	if (WARN_ON(fwspec->param_count < 1))
1060		return -EINVAL;
1061	*out_hwirq = fwspec->param[0];
1062	*out_type = IRQ_TYPE_NONE;
1063	return 0;
1064}
1065EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1066
1067/**
1068 * irq_domain_translate_twocell() - Generic translate for direct two cell
1069 * bindings
1070 *
1071 * Device Tree IRQ specifier translation function which works with two cell
1072 * bindings where the cell values map directly to the hwirq number
1073 * and linux irq flags.
1074 */
1075int irq_domain_translate_twocell(struct irq_domain *d,
1076				 struct irq_fwspec *fwspec,
1077				 unsigned long *out_hwirq,
1078				 unsigned int *out_type)
1079{
1080	if (WARN_ON(fwspec->param_count < 2))
1081		return -EINVAL;
1082	*out_hwirq = fwspec->param[0];
1083	*out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1084	return 0;
1085}
1086EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1087
1088int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1089			   int node, const struct irq_affinity_desc *affinity)
1090{
1091	unsigned int hint;
1092
1093	if (virq >= 0) {
1094		virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1095					 affinity);
1096	} else {
1097		hint = hwirq % nr_irqs;
1098		if (hint == 0)
1099			hint++;
1100		virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1101					 affinity);
1102		if (virq <= 0 && hint > 1) {
1103			virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1104						 affinity);
1105		}
1106	}
1107
1108	return virq;
1109}
1110
1111/**
1112 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1113 * @irq_data:	The pointer to irq_data
1114 */
1115void irq_domain_reset_irq_data(struct irq_data *irq_data)
1116{
1117	irq_data->hwirq = 0;
1118	irq_data->chip = &no_irq_chip;
1119	irq_data->chip_data = NULL;
1120}
1121EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1122
1123#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
1124/**
1125 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1126 * @parent:	Parent irq domain to associate with the new domain
1127 * @flags:	Irq domain flags associated to the domain
1128 * @size:	Size of the domain. See below
1129 * @fwnode:	Optional fwnode of the interrupt controller
1130 * @ops:	Pointer to the interrupt domain callbacks
1131 * @host_data:	Controller private data pointer
1132 *
1133 * If @size is 0 a tree domain is created, otherwise a linear domain.
1134 *
1135 * If successful the parent is associated to the new domain and the
1136 * domain flags are set.
1137 * Returns pointer to IRQ domain, or NULL on failure.
1138 */
1139struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1140					    unsigned int flags,
1141					    unsigned int size,
1142					    struct fwnode_handle *fwnode,
1143					    const struct irq_domain_ops *ops,
1144					    void *host_data)
1145{
1146	struct irq_domain *domain;
1147
1148	if (size)
1149		domain = __irq_domain_create(fwnode, size, size, 0, ops, host_data);
1150	else
1151		domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
1152
1153	if (domain) {
1154		if (parent)
1155			domain->root = parent->root;
1156		domain->parent = parent;
1157		domain->flags |= flags;
1158
1159		__irq_domain_publish(domain);
1160	}
1161
1162	return domain;
1163}
1164EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1165
1166static void irq_domain_insert_irq(int virq)
1167{
1168	struct irq_data *data;
1169
1170	for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1171		struct irq_domain *domain = data->domain;
1172
1173		domain->mapcount++;
1174		irq_domain_set_mapping(domain, data->hwirq, data);
1175	}
1176
1177	irq_clear_status_flags(virq, IRQ_NOREQUEST);
1178}
1179
1180static void irq_domain_remove_irq(int virq)
1181{
1182	struct irq_data *data;
1183
1184	irq_set_status_flags(virq, IRQ_NOREQUEST);
1185	irq_set_chip_and_handler(virq, NULL, NULL);
1186	synchronize_irq(virq);
1187	smp_mb();
1188
1189	for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1190		struct irq_domain *domain = data->domain;
1191		irq_hw_number_t hwirq = data->hwirq;
1192
1193		domain->mapcount--;
1194		irq_domain_clear_mapping(domain, hwirq);
1195	}
1196}
1197
1198static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1199						   struct irq_data *child)
1200{
1201	struct irq_data *irq_data;
1202
1203	irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1204				irq_data_get_node(child));
1205	if (irq_data) {
1206		child->parent_data = irq_data;
1207		irq_data->irq = child->irq;
1208		irq_data->common = child->common;
1209		irq_data->domain = domain;
1210	}
1211
1212	return irq_data;
1213}
1214
1215static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1216{
1217	struct irq_data *tmp;
1218
1219	while (irq_data) {
1220		tmp = irq_data;
1221		irq_data = irq_data->parent_data;
1222		kfree(tmp);
1223	}
1224}
1225
1226static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1227{
1228	struct irq_data *irq_data, *tmp;
1229	int i;
1230
1231	for (i = 0; i < nr_irqs; i++) {
1232		irq_data = irq_get_irq_data(virq + i);
1233		tmp = irq_data->parent_data;
1234		irq_data->parent_data = NULL;
1235		irq_data->domain = NULL;
1236
1237		__irq_domain_free_hierarchy(tmp);
1238	}
1239}
1240
1241/**
1242 * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1243 * @domain:	IRQ domain from which the hierarchy is to be disconnected
1244 * @virq:	IRQ number where the hierarchy is to be trimmed
1245 *
1246 * Marks the @virq level belonging to @domain as disconnected.
1247 * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1248 * to @domain.
1249 *
1250 * Its only use is to be able to trim levels of hierarchy that do not
1251 * have any real meaning for this interrupt, and that the driver marks
1252 * as such from its .alloc() callback.
1253 */
1254int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1255				    unsigned int virq)
1256{
1257	struct irq_data *irqd;
1258
1259	irqd = irq_domain_get_irq_data(domain, virq);
1260	if (!irqd)
1261		return -EINVAL;
1262
1263	irqd->chip = ERR_PTR(-ENOTCONN);
1264	return 0;
1265}
1266EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1267
1268static int irq_domain_trim_hierarchy(unsigned int virq)
1269{
1270	struct irq_data *tail, *irqd, *irq_data;
1271
1272	irq_data = irq_get_irq_data(virq);
1273	tail = NULL;
1274
1275	/* The first entry must have a valid irqchip */
1276	if (!irq_data->chip || IS_ERR(irq_data->chip))
1277		return -EINVAL;
1278
1279	/*
1280	 * Validate that the irq_data chain is sane in the presence of
1281	 * a hierarchy trimming marker.
1282	 */
1283	for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1284		/* Can't have a valid irqchip after a trim marker */
1285		if (irqd->chip && tail)
1286			return -EINVAL;
1287
1288		/* Can't have an empty irqchip before a trim marker */
1289		if (!irqd->chip && !tail)
1290			return -EINVAL;
1291
1292		if (IS_ERR(irqd->chip)) {
1293			/* Only -ENOTCONN is a valid trim marker */
1294			if (PTR_ERR(irqd->chip) != -ENOTCONN)
1295				return -EINVAL;
1296
1297			tail = irq_data;
1298		}
1299	}
1300
1301	/* No trim marker, nothing to do */
1302	if (!tail)
1303		return 0;
1304
1305	pr_info("IRQ%d: trimming hierarchy from %s\n",
1306		virq, tail->parent_data->domain->name);
1307
1308	/* Sever the inner part of the hierarchy...  */
1309	irqd = tail;
1310	tail = tail->parent_data;
1311	irqd->parent_data = NULL;
1312	__irq_domain_free_hierarchy(tail);
1313
1314	return 0;
1315}
1316
1317static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1318				     unsigned int virq, unsigned int nr_irqs)
1319{
1320	struct irq_data *irq_data;
1321	struct irq_domain *parent;
1322	int i;
1323
1324	/* The outermost irq_data is embedded in struct irq_desc */
1325	for (i = 0; i < nr_irqs; i++) {
1326		irq_data = irq_get_irq_data(virq + i);
1327		irq_data->domain = domain;
1328
1329		for (parent = domain->parent; parent; parent = parent->parent) {
1330			irq_data = irq_domain_insert_irq_data(parent, irq_data);
1331			if (!irq_data) {
1332				irq_domain_free_irq_data(virq, i + 1);
1333				return -ENOMEM;
1334			}
1335		}
1336	}
1337
1338	return 0;
1339}
1340
1341/**
1342 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1343 * @domain:	domain to match
1344 * @virq:	IRQ number to get irq_data
1345 */
1346struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1347					 unsigned int virq)
1348{
1349	struct irq_data *irq_data;
1350
1351	for (irq_data = irq_get_irq_data(virq); irq_data;
1352	     irq_data = irq_data->parent_data)
1353		if (irq_data->domain == domain)
1354			return irq_data;
1355
1356	return NULL;
1357}
1358EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1359
1360/**
1361 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1362 * @domain:	Interrupt domain to match
1363 * @virq:	IRQ number
1364 * @hwirq:	The hwirq number
1365 * @chip:	The associated interrupt chip
1366 * @chip_data:	The associated chip data
1367 */
1368int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1369				  irq_hw_number_t hwirq,
1370				  const struct irq_chip *chip,
1371				  void *chip_data)
1372{
1373	struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1374
1375	if (!irq_data)
1376		return -ENOENT;
1377
1378	irq_data->hwirq = hwirq;
1379	irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1380	irq_data->chip_data = chip_data;
1381
1382	return 0;
1383}
1384EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1385
1386/**
1387 * irq_domain_set_info - Set the complete data for a @virq in @domain
1388 * @domain:		Interrupt domain to match
1389 * @virq:		IRQ number
1390 * @hwirq:		The hardware interrupt number
1391 * @chip:		The associated interrupt chip
1392 * @chip_data:		The associated interrupt chip data
1393 * @handler:		The interrupt flow handler
1394 * @handler_data:	The interrupt flow handler data
1395 * @handler_name:	The interrupt handler name
1396 */
1397void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1398			 irq_hw_number_t hwirq, const struct irq_chip *chip,
1399			 void *chip_data, irq_flow_handler_t handler,
1400			 void *handler_data, const char *handler_name)
1401{
1402	irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1403	__irq_set_handler(virq, handler, 0, handler_name);
1404	irq_set_handler_data(virq, handler_data);
1405}
1406EXPORT_SYMBOL(irq_domain_set_info);
1407
1408/**
1409 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1410 * @domain:	Interrupt domain to match
1411 * @virq:	IRQ number to start with
1412 * @nr_irqs:	The number of irqs to free
1413 */
1414void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1415				 unsigned int nr_irqs)
1416{
1417	struct irq_data *irq_data;
1418	int i;
1419
1420	for (i = 0; i < nr_irqs; i++) {
1421		irq_data = irq_domain_get_irq_data(domain, virq + i);
1422		if (irq_data)
1423			irq_domain_reset_irq_data(irq_data);
1424	}
1425	irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1426}
1427EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1428
1429/**
1430 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1431 * @domain:	Interrupt domain to match
1432 * @virq:	IRQ number to start with
1433 * @nr_irqs:	The number of irqs to free
1434 */
1435void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1436			      unsigned int nr_irqs)
1437{
1438	int i;
1439
1440	for (i = 0; i < nr_irqs; i++) {
1441		irq_set_handler_data(virq + i, NULL);
1442		irq_set_handler(virq + i, NULL);
1443	}
1444	irq_domain_free_irqs_common(domain, virq, nr_irqs);
1445}
1446
1447static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1448					   unsigned int irq_base,
1449					   unsigned int nr_irqs)
1450{
1451	unsigned int i;
1452
1453	if (!domain->ops->free)
1454		return;
1455
1456	for (i = 0; i < nr_irqs; i++) {
1457		if (irq_domain_get_irq_data(domain, irq_base + i))
1458			domain->ops->free(domain, irq_base + i, 1);
1459	}
1460}
1461
1462int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1463				    unsigned int irq_base,
1464				    unsigned int nr_irqs, void *arg)
1465{
1466	if (!domain->ops->alloc) {
1467		pr_debug("domain->ops->alloc() is NULL\n");
1468		return -ENOSYS;
1469	}
1470
1471	return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1472}
1473
1474static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1475					unsigned int nr_irqs, int node, void *arg,
1476					bool realloc, const struct irq_affinity_desc *affinity)
1477{
1478	int i, ret, virq;
1479
1480	if (realloc && irq_base >= 0) {
1481		virq = irq_base;
1482	} else {
1483		virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1484					      affinity);
1485		if (virq < 0) {
1486			pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1487				 irq_base, nr_irqs);
1488			return virq;
1489		}
1490	}
1491
1492	if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1493		pr_debug("cannot allocate memory for IRQ%d\n", virq);
1494		ret = -ENOMEM;
1495		goto out_free_desc;
1496	}
1497
1498	ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1499	if (ret < 0)
1500		goto out_free_irq_data;
1501
1502	for (i = 0; i < nr_irqs; i++) {
1503		ret = irq_domain_trim_hierarchy(virq + i);
1504		if (ret)
1505			goto out_free_irq_data;
1506	}
1507
1508	for (i = 0; i < nr_irqs; i++)
1509		irq_domain_insert_irq(virq + i);
1510
1511	return virq;
1512
1513out_free_irq_data:
1514	irq_domain_free_irq_data(virq, nr_irqs);
1515out_free_desc:
1516	irq_free_descs(virq, nr_irqs);
1517	return ret;
1518}
1519
1520/**
1521 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1522 * @domain:	domain to allocate from
1523 * @irq_base:	allocate specified IRQ number if irq_base >= 0
1524 * @nr_irqs:	number of IRQs to allocate
1525 * @node:	NUMA node id for memory allocation
1526 * @arg:	domain specific argument
1527 * @realloc:	IRQ descriptors have already been allocated if true
1528 * @affinity:	Optional irq affinity mask for multiqueue devices
1529 *
1530 * Allocate IRQ numbers and initialized all data structures to support
1531 * hierarchy IRQ domains.
1532 * Parameter @realloc is mainly to support legacy IRQs.
1533 * Returns error code or allocated IRQ number
1534 *
1535 * The whole process to setup an IRQ has been split into two steps.
1536 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1537 * descriptor and required hardware resources. The second step,
1538 * irq_domain_activate_irq(), is to program the hardware with preallocated
1539 * resources. In this way, it's easier to rollback when failing to
1540 * allocate resources.
1541 */
1542int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1543			    unsigned int nr_irqs, int node, void *arg,
1544			    bool realloc, const struct irq_affinity_desc *affinity)
1545{
1546	int ret;
1547
1548	if (domain == NULL) {
1549		domain = irq_default_domain;
1550		if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1551			return -EINVAL;
1552	}
1553
1554	mutex_lock(&domain->root->mutex);
1555	ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1556					   realloc, affinity);
1557	mutex_unlock(&domain->root->mutex);
1558
1559	return ret;
1560}
1561EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1562
1563/* The irq_data was moved, fix the revmap to refer to the new location */
1564static void irq_domain_fix_revmap(struct irq_data *d)
1565{
1566	void __rcu **slot;
1567
1568	lockdep_assert_held(&d->domain->root->mutex);
1569
1570	if (irq_domain_is_nomap(d->domain))
1571		return;
1572
1573	/* Fix up the revmap. */
1574	if (d->hwirq < d->domain->revmap_size) {
1575		/* Not using radix tree */
1576		rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1577	} else {
1578		slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1579		if (slot)
1580			radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1581	}
1582}
1583
1584/**
1585 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1586 * @domain:	Domain to push.
1587 * @virq:	Irq to push the domain in to.
1588 * @arg:	Passed to the irq_domain_ops alloc() function.
1589 *
1590 * For an already existing irqdomain hierarchy, as might be obtained
1591 * via a call to pci_enable_msix(), add an additional domain to the
1592 * head of the processing chain.  Must be called before request_irq()
1593 * has been called.
1594 */
1595int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1596{
1597	struct irq_data *irq_data = irq_get_irq_data(virq);
1598	struct irq_data *parent_irq_data;
1599	struct irq_desc *desc;
1600	int rv = 0;
1601
1602	/*
1603	 * Check that no action has been set, which indicates the virq
1604	 * is in a state where this function doesn't have to deal with
1605	 * races between interrupt handling and maintaining the
1606	 * hierarchy.  This will catch gross misuse.  Attempting to
1607	 * make the check race free would require holding locks across
1608	 * calls to struct irq_domain_ops->alloc(), which could lead
1609	 * to deadlock, so we just do a simple check before starting.
1610	 */
1611	desc = irq_to_desc(virq);
1612	if (!desc)
1613		return -EINVAL;
1614	if (WARN_ON(desc->action))
1615		return -EBUSY;
1616
1617	if (domain == NULL)
1618		return -EINVAL;
1619
1620	if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1621		return -EINVAL;
1622
1623	if (!irq_data)
1624		return -EINVAL;
1625
1626	if (domain->parent != irq_data->domain)
1627		return -EINVAL;
1628
1629	parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1630				       irq_data_get_node(irq_data));
1631	if (!parent_irq_data)
1632		return -ENOMEM;
1633
1634	mutex_lock(&domain->root->mutex);
1635
1636	/* Copy the original irq_data. */
1637	*parent_irq_data = *irq_data;
1638
1639	/*
1640	 * Overwrite the irq_data, which is embedded in struct irq_desc, with
1641	 * values for this domain.
1642	 */
1643	irq_data->parent_data = parent_irq_data;
1644	irq_data->domain = domain;
1645	irq_data->mask = 0;
1646	irq_data->hwirq = 0;
1647	irq_data->chip = NULL;
1648	irq_data->chip_data = NULL;
1649
1650	/* May (probably does) set hwirq, chip, etc. */
1651	rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1652	if (rv) {
1653		/* Restore the original irq_data. */
1654		*irq_data = *parent_irq_data;
1655		kfree(parent_irq_data);
1656		goto error;
1657	}
1658
1659	irq_domain_fix_revmap(parent_irq_data);
1660	irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
1661error:
1662	mutex_unlock(&domain->root->mutex);
1663
1664	return rv;
1665}
1666EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1667
1668/**
1669 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1670 * @domain:	Domain to remove.
1671 * @virq:	Irq to remove the domain from.
1672 *
1673 * Undo the effects of a call to irq_domain_push_irq().  Must be
1674 * called either before request_irq() or after free_irq().
1675 */
1676int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1677{
1678	struct irq_data *irq_data = irq_get_irq_data(virq);
1679	struct irq_data *parent_irq_data;
1680	struct irq_data *tmp_irq_data;
1681	struct irq_desc *desc;
1682
1683	/*
1684	 * Check that no action is set, which indicates the virq is in
1685	 * a state where this function doesn't have to deal with races
1686	 * between interrupt handling and maintaining the hierarchy.
1687	 * This will catch gross misuse.  Attempting to make the check
1688	 * race free would require holding locks across calls to
1689	 * struct irq_domain_ops->free(), which could lead to
1690	 * deadlock, so we just do a simple check before starting.
1691	 */
1692	desc = irq_to_desc(virq);
1693	if (!desc)
1694		return -EINVAL;
1695	if (WARN_ON(desc->action))
1696		return -EBUSY;
1697
1698	if (domain == NULL)
1699		return -EINVAL;
1700
1701	if (!irq_data)
1702		return -EINVAL;
1703
1704	tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1705
1706	/* We can only "pop" if this domain is at the top of the list */
1707	if (WARN_ON(irq_data != tmp_irq_data))
1708		return -EINVAL;
1709
1710	if (WARN_ON(irq_data->domain != domain))
1711		return -EINVAL;
1712
1713	parent_irq_data = irq_data->parent_data;
1714	if (WARN_ON(!parent_irq_data))
1715		return -EINVAL;
1716
1717	mutex_lock(&domain->root->mutex);
1718
1719	irq_data->parent_data = NULL;
1720
1721	irq_domain_clear_mapping(domain, irq_data->hwirq);
1722	irq_domain_free_irqs_hierarchy(domain, virq, 1);
1723
1724	/* Restore the original irq_data. */
1725	*irq_data = *parent_irq_data;
1726
1727	irq_domain_fix_revmap(irq_data);
1728
1729	mutex_unlock(&domain->root->mutex);
1730
1731	kfree(parent_irq_data);
1732
1733	return 0;
1734}
1735EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1736
1737/**
1738 * irq_domain_free_irqs - Free IRQ number and associated data structures
1739 * @virq:	base IRQ number
1740 * @nr_irqs:	number of IRQs to free
1741 */
1742void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1743{
1744	struct irq_data *data = irq_get_irq_data(virq);
1745	struct irq_domain *domain;
1746	int i;
1747
1748	if (WARN(!data || !data->domain || !data->domain->ops->free,
1749		 "NULL pointer, cannot free irq\n"))
1750		return;
1751
1752	domain = data->domain;
1753
1754	mutex_lock(&domain->root->mutex);
1755	for (i = 0; i < nr_irqs; i++)
1756		irq_domain_remove_irq(virq + i);
1757	irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
1758	mutex_unlock(&domain->root->mutex);
1759
1760	irq_domain_free_irq_data(virq, nr_irqs);
1761	irq_free_descs(virq, nr_irqs);
1762}
1763
1764static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq)
1765{
1766	if (irq_domain_is_msi_device(domain))
1767		msi_device_domain_free_wired(domain, virq);
1768	else
1769		irq_domain_free_irqs(virq, 1);
1770}
1771
1772/**
1773 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1774 * @domain:	Domain below which interrupts must be allocated
1775 * @irq_base:	Base IRQ number
1776 * @nr_irqs:	Number of IRQs to allocate
1777 * @arg:	Allocation data (arch/domain specific)
1778 */
1779int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1780				 unsigned int irq_base, unsigned int nr_irqs,
1781				 void *arg)
1782{
1783	if (!domain->parent)
1784		return -ENOSYS;
1785
1786	return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1787					       nr_irqs, arg);
1788}
1789EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1790
1791/**
1792 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1793 * @domain:	Domain below which interrupts must be freed
1794 * @irq_base:	Base IRQ number
1795 * @nr_irqs:	Number of IRQs to free
1796 */
1797void irq_domain_free_irqs_parent(struct irq_domain *domain,
1798				 unsigned int irq_base, unsigned int nr_irqs)
1799{
1800	if (!domain->parent)
1801		return;
1802
1803	irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1804}
1805EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1806
1807static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1808{
1809	if (irq_data && irq_data->domain) {
1810		struct irq_domain *domain = irq_data->domain;
1811
1812		if (domain->ops->deactivate)
1813			domain->ops->deactivate(domain, irq_data);
1814		if (irq_data->parent_data)
1815			__irq_domain_deactivate_irq(irq_data->parent_data);
1816	}
1817}
1818
1819static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1820{
1821	int ret = 0;
1822
1823	if (irqd && irqd->domain) {
1824		struct irq_domain *domain = irqd->domain;
1825
1826		if (irqd->parent_data)
1827			ret = __irq_domain_activate_irq(irqd->parent_data,
1828							reserve);
1829		if (!ret && domain->ops->activate) {
1830			ret = domain->ops->activate(domain, irqd, reserve);
1831			/* Rollback in case of error */
1832			if (ret && irqd->parent_data)
1833				__irq_domain_deactivate_irq(irqd->parent_data);
1834		}
1835	}
1836	return ret;
1837}
1838
1839/**
1840 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1841 *			     interrupt
1842 * @irq_data:	Outermost irq_data associated with interrupt
1843 * @reserve:	If set only reserve an interrupt vector instead of assigning one
1844 *
1845 * This is the second step to call domain_ops->activate to program interrupt
1846 * controllers, so the interrupt could actually get delivered.
1847 */
1848int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1849{
1850	int ret = 0;
1851
1852	if (!irqd_is_activated(irq_data))
1853		ret = __irq_domain_activate_irq(irq_data, reserve);
1854	if (!ret)
1855		irqd_set_activated(irq_data);
1856	return ret;
1857}
1858
1859/**
1860 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1861 *			       deactivate interrupt
1862 * @irq_data: outermost irq_data associated with interrupt
1863 *
1864 * It calls domain_ops->deactivate to program interrupt controllers to disable
1865 * interrupt delivery.
1866 */
1867void irq_domain_deactivate_irq(struct irq_data *irq_data)
1868{
1869	if (irqd_is_activated(irq_data)) {
1870		__irq_domain_deactivate_irq(irq_data);
1871		irqd_clr_activated(irq_data);
1872	}
1873}
1874
1875static void irq_domain_check_hierarchy(struct irq_domain *domain)
1876{
1877	/* Hierarchy irq_domains must implement callback alloc() */
1878	if (domain->ops->alloc)
1879		domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1880}
1881#else	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
1882/**
1883 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1884 * @domain:	domain to match
1885 * @virq:	IRQ number to get irq_data
1886 */
1887struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1888					 unsigned int virq)
1889{
1890	struct irq_data *irq_data = irq_get_irq_data(virq);
1891
1892	return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1893}
1894EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1895
1896/**
1897 * irq_domain_set_info - Set the complete data for a @virq in @domain
1898 * @domain:		Interrupt domain to match
1899 * @virq:		IRQ number
1900 * @hwirq:		The hardware interrupt number
1901 * @chip:		The associated interrupt chip
1902 * @chip_data:		The associated interrupt chip data
1903 * @handler:		The interrupt flow handler
1904 * @handler_data:	The interrupt flow handler data
1905 * @handler_name:	The interrupt handler name
1906 */
1907void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1908			 irq_hw_number_t hwirq, const struct irq_chip *chip,
1909			 void *chip_data, irq_flow_handler_t handler,
1910			 void *handler_data, const char *handler_name)
1911{
1912	irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1913	irq_set_chip_data(virq, chip_data);
1914	irq_set_handler_data(virq, handler_data);
1915}
1916
1917static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1918					unsigned int nr_irqs, int node, void *arg,
1919					bool realloc, const struct irq_affinity_desc *affinity)
1920{
1921	return -EINVAL;
1922}
1923
1924static void irq_domain_check_hierarchy(struct irq_domain *domain) { }
1925static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq) { }
1926
1927#endif	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
1928
1929#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1930#include "internals.h"
1931
1932static struct dentry *domain_dir;
1933
1934static void
1935irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1936{
1937	seq_printf(m, "%*sname:   %s\n", ind, "", d->name);
1938	seq_printf(m, "%*ssize:   %u\n", ind + 1, "", d->revmap_size);
1939	seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1940	seq_printf(m, "%*sflags:  0x%08x\n", ind +1 , "", d->flags);
1941	if (d->ops && d->ops->debug_show)
1942		d->ops->debug_show(m, d, NULL, ind + 1);
1943#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
1944	if (!d->parent)
1945		return;
1946	seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1947	irq_domain_debug_show_one(m, d->parent, ind + 4);
1948#endif
1949}
1950
1951static int irq_domain_debug_show(struct seq_file *m, void *p)
1952{
1953	struct irq_domain *d = m->private;
1954
1955	/* Default domain? Might be NULL */
1956	if (!d) {
1957		if (!irq_default_domain)
1958			return 0;
1959		d = irq_default_domain;
1960	}
1961	irq_domain_debug_show_one(m, d, 0);
1962	return 0;
1963}
1964DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1965
1966static void debugfs_add_domain_dir(struct irq_domain *d)
1967{
1968	if (!d->name || !domain_dir)
1969		return;
1970	debugfs_create_file(d->name, 0444, domain_dir, d,
1971			    &irq_domain_debug_fops);
1972}
1973
1974static void debugfs_remove_domain_dir(struct irq_domain *d)
1975{
1976	debugfs_lookup_and_remove(d->name, domain_dir);
1977}
1978
1979void __init irq_domain_debugfs_init(struct dentry *root)
1980{
1981	struct irq_domain *d;
1982
1983	domain_dir = debugfs_create_dir("domains", root);
1984
1985	debugfs_create_file("default", 0444, domain_dir, NULL,
1986			    &irq_domain_debug_fops);
1987	mutex_lock(&irq_domain_mutex);
1988	list_for_each_entry(d, &irq_domain_list, link)
1989		debugfs_add_domain_dir(d);
1990	mutex_unlock(&irq_domain_mutex);
1991}
1992#endif