kernel/irq/irqdomain.c

   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
  23 static LIST_HEAD(irq_domain_list);
  24 static DEFINE_MUTEX(irq_domain_mutex);
  25
  26 static struct irq_domain *irq_default_domain;
  27
  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
  33 struct irqchip_fwid {
  34         struct fwnode_handle    fwnode;
  35         unsigned int            type;
  36         char                    *name;
  37         phys_addr_t             *pa;
  38 };
  39
  40 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
  41 static void debugfs_add_domain_dir(struct irq_domain *d);
  42 static void debugfs_remove_domain_dir(struct irq_domain *d);
  43 #else
  44 static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
  45 static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
  46 #endif
  47
  48 static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
  49 {
  50         struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
  51
  52         return fwid->name;
  53 }
  54
  55 const struct fwnode_operations irqchip_fwnode_ops = {
  56         .get_name = irqchip_fwnode_get_name,
  57 };
  58 EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
  59
  60 /**
  61  * __irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
  62  *                           identifying an irq domain
  63  * @type:       Type of irqchip_fwnode. See linux/irqdomain.h
  64  * @id:         Optional user provided id if name != NULL
  65  * @name:       Optional user provided domain name
  66  * @pa:         Optional user-provided physical address
  67  *
  68  * Allocate a struct irqchip_fwid, and return a pointer to the embedded
  69  * fwnode_handle (or NULL on failure).
  70  *
  71  * Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
  72  * solely to transport name information to irqdomain creation code. The
  73  * node is not stored. For other types the pointer is kept in the irq
  74  * domain struct.
  75  */
  76 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
  77                                                 const char *name,
  78                                                 phys_addr_t *pa)
  79 {
  80         struct irqchip_fwid *fwid;
  81         char *n;
  82
  83         fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
  84
  85         switch (type) {
  86         case IRQCHIP_FWNODE_NAMED:
  87                 n = kasprintf(GFP_KERNEL, "%s", name);
  88                 break;
  89         case IRQCHIP_FWNODE_NAMED_ID:
  90                 n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
  91                 break;
  92         default:
  93                 n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
  94                 break;
  95         }
  96
  97         if (!fwid || !n) {
  98                 kfree(fwid);
  99                 kfree(n);
 100                 return NULL;
 101         }
 102
 103         fwid->type = type;
 104         fwid->name = n;
 105         fwid->pa = pa;
 106         fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
 107         return &fwid->fwnode;
 108 }
 109 EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
 110
 111 /**
 112  * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
 113  *
 114  * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
 115  */
 116 void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
 117 {
 118         struct irqchip_fwid *fwid;
 119
 120         if (!fwnode || WARN_ON(!is_fwnode_irqchip(fwnode)))
 121                 return;
 122
 123         fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
 124         kfree(fwid->name);
 125         kfree(fwid);
 126 }
 127 EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
 128
 129 static struct irq_domain *__irq_domain_create(struct fwnode_handle *fwnode,
 130                                               unsigned int size,
 131                                               irq_hw_number_t hwirq_max,
 132                                               int direct_max,
 133                                               const struct irq_domain_ops *ops,
 134                                               void *host_data)
 135 {
 136         struct irqchip_fwid *fwid;
 137         struct irq_domain *domain;
 138
 139         static atomic_t unknown_domains;
 140
 141         if (WARN_ON((size && direct_max) ||
 142                     (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max) ||
 143                     (direct_max && (direct_max != hwirq_max))))
 144                 return NULL;
 145
 146         domain = kzalloc_node(struct_size(domain, revmap, size),
 147                               GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
 148         if (!domain)
 149                 return NULL;
 150
 151         if (is_fwnode_irqchip(fwnode)) {
 152                 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
 153
 154                 switch (fwid->type) {
 155                 case IRQCHIP_FWNODE_NAMED:
 156                 case IRQCHIP_FWNODE_NAMED_ID:
 157                         domain->fwnode = fwnode;
 158                         domain->name = kstrdup(fwid->name, GFP_KERNEL);
 159                         if (!domain->name) {
 160                                 kfree(domain);
 161                                 return NULL;
 162                         }
 163                         domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 164                         break;
 165                 default:
 166                         domain->fwnode = fwnode;
 167                         domain->name = fwid->name;
 168                         break;
 169                 }
 170         } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
 171                    is_software_node(fwnode)) {
 172                 char *name;
 173
 174                 /*
 175                  * fwnode paths contain '/', which debugfs is legitimately
 176                  * unhappy about. Replace them with ':', which does
 177                  * the trick and is not as offensive as '\'...
 178                  */
 179                 name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
 180                 if (!name) {
 181                         kfree(domain);
 182                         return NULL;
 183                 }
 184
 185                 strreplace(name, '/', ':');
 186
 187                 domain->name = name;
 188                 domain->fwnode = fwnode;
 189                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 190         }
 191
 192         if (!domain->name) {
 193                 if (fwnode)
 194                         pr_err("Invalid fwnode type for irqdomain\n");
 195                 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
 196                                          atomic_inc_return(&unknown_domains));
 197                 if (!domain->name) {
 198                         kfree(domain);
 199                         return NULL;
 200                 }
 201                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 202         }
 203
 204         fwnode_handle_get(fwnode);
 205         fwnode_dev_initialized(fwnode, true);
 206
 207         /* Fill structure */
 208         INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
 209         domain->ops = ops;
 210         domain->host_data = host_data;
 211         domain->hwirq_max = hwirq_max;
 212
 213         if (direct_max)
 214                 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
 215
 216         domain->revmap_size = size;
 217
 218         /*
 219          * Hierarchical domains use the domain lock of the root domain
 220          * (innermost domain).
 221          *
 222          * For non-hierarchical domains (as for root domains), the root
 223          * pointer is set to the domain itself so that &domain->root->mutex
 224          * always points to the right lock.
 225          */
 226         mutex_init(&domain->mutex);
 227         domain->root = domain;
 228
 229         irq_domain_check_hierarchy(domain);
 230
 231         return domain;
 232 }
 233
 234 static void __irq_domain_publish(struct irq_domain *domain)
 235 {
 236         mutex_lock(&irq_domain_mutex);
 237         debugfs_add_domain_dir(domain);
 238         list_add(&domain->link, &irq_domain_list);
 239         mutex_unlock(&irq_domain_mutex);
 240
 241         pr_debug("Added domain %s\n", domain->name);
 242 }
 243
 244 /**
 245  * __irq_domain_add() - Allocate a new irq_domain data structure
 246  * @fwnode: firmware node for the interrupt controller
 247  * @size: Size of linear map; 0 for radix mapping only
 248  * @hwirq_max: Maximum number of interrupts supported by controller
 249  * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
 250  *              direct mapping
 251  * @ops: domain callbacks
 252  * @host_data: Controller private data pointer
 253  *
 254  * Allocates and initializes an irq_domain structure.
 255  * Returns pointer to IRQ domain, or NULL on failure.
 256  */
 257 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
 258                                     irq_hw_number_t hwirq_max, int direct_max,
 259                                     const struct irq_domain_ops *ops,
 260                                     void *host_data)
 261 {
 262         struct irq_domain *domain;
 263
 264         domain = __irq_domain_create(fwnode, size, hwirq_max, direct_max,
 265                                      ops, host_data);
 266         if (domain)
 267                 __irq_domain_publish(domain);
 268
 269         return domain;
 270 }
 271 EXPORT_SYMBOL_GPL(__irq_domain_add);
 272
 273 /**
 274  * irq_domain_remove() - Remove an irq domain.
 275  * @domain: domain to remove
 276  *
 277  * This routine is used to remove an irq domain. The caller must ensure
 278  * that all mappings within the domain have been disposed of prior to
 279  * use, depending on the revmap type.
 280  */
 281 void irq_domain_remove(struct irq_domain *domain)
 282 {
 283         mutex_lock(&irq_domain_mutex);
 284         debugfs_remove_domain_dir(domain);
 285
 286         WARN_ON(!radix_tree_empty(&domain->revmap_tree));
 287
 288         list_del(&domain->link);
 289
 290         /*
 291          * If the going away domain is the default one, reset it.
 292          */
 293         if (unlikely(irq_default_domain == domain))
 294                 irq_set_default_host(NULL);
 295
 296         mutex_unlock(&irq_domain_mutex);
 297
 298         pr_debug("Removed domain %s\n", domain->name);
 299
 300         fwnode_dev_initialized(domain->fwnode, false);
 301         fwnode_handle_put(domain->fwnode);
 302         if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
 303                 kfree(domain->name);
 304         kfree(domain);
 305 }
 306 EXPORT_SYMBOL_GPL(irq_domain_remove);
 307
 308 void irq_domain_update_bus_token(struct irq_domain *domain,
 309                                  enum irq_domain_bus_token bus_token)
 310 {
 311         char *name;
 312
 313         if (domain->bus_token == bus_token)
 314                 return;
 315
 316         mutex_lock(&irq_domain_mutex);
 317
 318         domain->bus_token = bus_token;
 319
 320         name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
 321         if (!name) {
 322                 mutex_unlock(&irq_domain_mutex);
 323                 return;
 324         }
 325
 326         debugfs_remove_domain_dir(domain);
 327
 328         if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
 329                 kfree(domain->name);
 330         else
 331                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 332
 333         domain->name = name;
 334         debugfs_add_domain_dir(domain);
 335
 336         mutex_unlock(&irq_domain_mutex);
 337 }
 338 EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
 339
 340 /**
 341  * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
 342  * @fwnode: firmware node for the interrupt controller
 343  * @size: total number of irqs in mapping
 344  * @first_irq: first number of irq block assigned to the domain,
 345  *      pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
 346  *      pre-map all of the irqs in the domain to virqs starting at first_irq.
 347  * @ops: domain callbacks
 348  * @host_data: Controller private data pointer
 349  *
 350  * Allocates an irq_domain, and optionally if first_irq is positive then also
 351  * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
 352  *
 353  * This is intended to implement the expected behaviour for most
 354  * interrupt controllers. If device tree is used, then first_irq will be 0 and
 355  * irqs get mapped dynamically on the fly. However, if the controller requires
 356  * static virq assignments (non-DT boot) then it will set that up correctly.
 357  */
 358 struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
 359                                             unsigned int size,
 360                                             unsigned int first_irq,
 361                                             const struct irq_domain_ops *ops,
 362                                             void *host_data)
 363 {
 364         struct irq_domain *domain;
 365
 366         domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data);
 367         if (!domain)
 368                 return NULL;
 369
 370         if (first_irq > 0) {
 371                 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
 372                         /* attempt to allocated irq_descs */
 373                         int rc = irq_alloc_descs(first_irq, first_irq, size,
 374                                                  of_node_to_nid(to_of_node(fwnode)));
 375                         if (rc < 0)
 376                                 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
 377                                         first_irq);
 378                 }
 379                 irq_domain_associate_many(domain, first_irq, 0, size);
 380         }
 381
 382         return domain;
 383 }
 384 EXPORT_SYMBOL_GPL(irq_domain_create_simple);
 385
 386 /**
 387  * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
 388  * @of_node: pointer to interrupt controller's device tree node.
 389  * @size: total number of irqs in legacy mapping
 390  * @first_irq: first number of irq block assigned to the domain
 391  * @first_hwirq: first hwirq number to use for the translation. Should normally
 392  *               be '0', but a positive integer can be used if the effective
 393  *               hwirqs numbering does not begin at zero.
 394  * @ops: map/unmap domain callbacks
 395  * @host_data: Controller private data pointer
 396  *
 397  * Note: the map() callback will be called before this function returns
 398  * for all legacy interrupts except 0 (which is always the invalid irq for
 399  * a legacy controller).
 400  */
 401 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 402                                          unsigned int size,
 403                                          unsigned int first_irq,
 404                                          irq_hw_number_t first_hwirq,
 405                                          const struct irq_domain_ops *ops,
 406                                          void *host_data)
 407 {
 408         return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
 409                                         first_irq, first_hwirq, ops, host_data);
 410 }
 411 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 412
 413 struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
 414                                          unsigned int size,
 415                                          unsigned int first_irq,
 416                                          irq_hw_number_t first_hwirq,
 417                                          const struct irq_domain_ops *ops,
 418                                          void *host_data)
 419 {
 420         struct irq_domain *domain;
 421
 422         domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
 423         if (domain)
 424                 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
 425
 426         return domain;
 427 }
 428 EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
 429
 430 /**
 431  * irq_find_matching_fwspec() - Locates a domain for a given fwspec
 432  * @fwspec: FW specifier for an interrupt
 433  * @bus_token: domain-specific data
 434  */
 435 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
 436                                             enum irq_domain_bus_token bus_token)
 437 {
 438         struct irq_domain *h, *found = NULL;
 439         struct fwnode_handle *fwnode = fwspec->fwnode;
 440         int rc;
 441
 442         /* We might want to match the legacy controller last since
 443          * it might potentially be set to match all interrupts in
 444          * the absence of a device node. This isn't a problem so far
 445          * yet though...
 446          *
 447          * bus_token == DOMAIN_BUS_ANY matches any domain, any other
 448          * values must generate an exact match for the domain to be
 449          * selected.
 450          */
 451         mutex_lock(&irq_domain_mutex);
 452         list_for_each_entry(h, &irq_domain_list, link) {
 453                 if (h->ops->select && fwspec->param_count)
 454                         rc = h->ops->select(h, fwspec, bus_token);
 455                 else if (h->ops->match)
 456                         rc = h->ops->match(h, to_of_node(fwnode), bus_token);
 457                 else
 458                         rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
 459                               ((bus_token == DOMAIN_BUS_ANY) ||
 460                                (h->bus_token == bus_token)));
 461
 462                 if (rc) {
 463                         found = h;
 464                         break;
 465                 }
 466         }
 467         mutex_unlock(&irq_domain_mutex);
 468         return found;
 469 }
 470 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
 471
 472 /**
 473  * irq_domain_check_msi_remap - Check whether all MSI irq domains implement
 474  * IRQ remapping
 475  *
 476  * Return: false if any MSI irq domain does not support IRQ remapping,
 477  * true otherwise (including if there is no MSI irq domain)
 478  */
 479 bool irq_domain_check_msi_remap(void)
 480 {
 481         struct irq_domain *h;
 482         bool ret = true;
 483
 484         mutex_lock(&irq_domain_mutex);
 485         list_for_each_entry(h, &irq_domain_list, link) {
 486                 if (irq_domain_is_msi(h) &&
 487                     !irq_domain_hierarchical_is_msi_remap(h)) {
 488                         ret = false;
 489                         break;
 490                 }
 491         }
 492         mutex_unlock(&irq_domain_mutex);
 493         return ret;
 494 }
 495 EXPORT_SYMBOL_GPL(irq_domain_check_msi_remap);
 496
 497 /**
 498  * irq_set_default_host() - Set a "default" irq domain
 499  * @domain: default domain pointer
 500  *
 501  * For convenience, it's possible to set a "default" domain that will be used
 502  * whenever NULL is passed to irq_create_mapping(). It makes life easier for
 503  * platforms that want to manipulate a few hard coded interrupt numbers that
 504  * aren't properly represented in the device-tree.
 505  */
 506 void irq_set_default_host(struct irq_domain *domain)
 507 {
 508         pr_debug("Default domain set to @0x%p\n", domain);
 509
 510         irq_default_domain = domain;
 511 }
 512 EXPORT_SYMBOL_GPL(irq_set_default_host);
 513
 514 /**
 515  * irq_get_default_host() - Retrieve the "default" irq domain
 516  *
 517  * Returns: the default domain, if any.
 518  *
 519  * Modern code should never use this. This should only be used on
 520  * systems that cannot implement a firmware->fwnode mapping (which
 521  * both DT and ACPI provide).
 522  */
 523 struct irq_domain *irq_get_default_host(void)
 524 {
 525         return irq_default_domain;
 526 }
 527 EXPORT_SYMBOL_GPL(irq_get_default_host);
 528
 529 static bool irq_domain_is_nomap(struct irq_domain *domain)
 530 {
 531         return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
 532                (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
 533 }
 534
 535 static void irq_domain_clear_mapping(struct irq_domain *domain,
 536                                      irq_hw_number_t hwirq)
 537 {
 538         lockdep_assert_held(&domain->root->mutex);
 539
 540         if (irq_domain_is_nomap(domain))
 541                 return;
 542
 543         if (hwirq < domain->revmap_size)
 544                 rcu_assign_pointer(domain->revmap[hwirq], NULL);
 545         else
 546                 radix_tree_delete(&domain->revmap_tree, hwirq);
 547 }
 548
 549 static void irq_domain_set_mapping(struct irq_domain *domain,
 550                                    irq_hw_number_t hwirq,
 551                                    struct irq_data *irq_data)
 552 {
 553         /*
 554          * This also makes sure that all domains point to the same root when
 555          * called from irq_domain_insert_irq() for each domain in a hierarchy.
 556          */
 557         lockdep_assert_held(&domain->root->mutex);
 558
 559         if (irq_domain_is_nomap(domain))
 560                 return;
 561
 562         if (hwirq < domain->revmap_size)
 563                 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
 564         else
 565                 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
 566 }
 567
 568 static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
 569 {
 570         struct irq_data *irq_data = irq_get_irq_data(irq);
 571         irq_hw_number_t hwirq;
 572
 573         if (WARN(!irq_data || irq_data->domain != domain,
 574                  "virq%i doesn't exist; cannot disassociate\n", irq))
 575                 return;
 576
 577         hwirq = irq_data->hwirq;
 578
 579         mutex_lock(&domain->root->mutex);
 580
 581         irq_set_status_flags(irq, IRQ_NOREQUEST);
 582
 583         /* remove chip and handler */
 584         irq_set_chip_and_handler(irq, NULL, NULL);
 585
 586         /* Make sure it's completed */
 587         synchronize_irq(irq);
 588
 589         /* Tell the PIC about it */
 590         if (domain->ops->unmap)
 591                 domain->ops->unmap(domain, irq);
 592         smp_mb();
 593
 594         irq_data->domain = NULL;
 595         irq_data->hwirq = 0;
 596         domain->mapcount--;
 597
 598         /* Clear reverse map for this hwirq */
 599         irq_domain_clear_mapping(domain, hwirq);
 600
 601         mutex_unlock(&domain->root->mutex);
 602 }
 603
 604 static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
 605                                        irq_hw_number_t hwirq)
 606 {
 607         struct irq_data *irq_data = irq_get_irq_data(virq);
 608         int ret;
 609
 610         if (WARN(hwirq >= domain->hwirq_max,
 611                  "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
 612                 return -EINVAL;
 613         if (WARN(!irq_data, "error: virq%i is not allocated", virq))
 614                 return -EINVAL;
 615         if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
 616                 return -EINVAL;
 617
 618         irq_data->hwirq = hwirq;
 619         irq_data->domain = domain;
 620         if (domain->ops->map) {
 621                 ret = domain->ops->map(domain, virq, hwirq);
 622                 if (ret != 0) {
 623                         /*
 624                          * If map() returns -EPERM, this interrupt is protected
 625                          * by the firmware or some other service and shall not
 626                          * be mapped. Don't bother telling the user about it.
 627                          */
 628                         if (ret != -EPERM) {
 629                                 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
 630                                        domain->name, hwirq, virq, ret);
 631                         }
 632                         irq_data->domain = NULL;
 633                         irq_data->hwirq = 0;
 634                         return ret;
 635                 }
 636         }
 637
 638         domain->mapcount++;
 639         irq_domain_set_mapping(domain, hwirq, irq_data);
 640
 641         irq_clear_status_flags(virq, IRQ_NOREQUEST);
 642
 643         return 0;
 644 }
 645
 646 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
 647                          irq_hw_number_t hwirq)
 648 {
 649         int ret;
 650
 651         mutex_lock(&domain->root->mutex);
 652         ret = irq_domain_associate_locked(domain, virq, hwirq);
 653         mutex_unlock(&domain->root->mutex);
 654
 655         return ret;
 656 }
 657 EXPORT_SYMBOL_GPL(irq_domain_associate);
 658
 659 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 660                                irq_hw_number_t hwirq_base, int count)
 661 {
 662         struct device_node *of_node;
 663         int i;
 664
 665         of_node = irq_domain_get_of_node(domain);
 666         pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
 667                 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
 668
 669         for (i = 0; i < count; i++)
 670                 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
 671 }
 672 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
 673
 674 #ifdef CONFIG_IRQ_DOMAIN_NOMAP
 675 /**
 676  * irq_create_direct_mapping() - Allocate an irq for direct mapping
 677  * @domain: domain to allocate the irq for or NULL for default domain
 678  *
 679  * This routine is used for irq controllers which can choose the hardware
 680  * interrupt numbers they generate. In such a case it's simplest to use
 681  * the linux irq as the hardware interrupt number. It still uses the linear
 682  * or radix tree to store the mapping, but the irq controller can optimize
 683  * the revmap path by using the hwirq directly.
 684  */
 685 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 686 {
 687         struct device_node *of_node;
 688         unsigned int virq;
 689
 690         if (domain == NULL)
 691                 domain = irq_default_domain;
 692
 693         of_node = irq_domain_get_of_node(domain);
 694         virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
 695         if (!virq) {
 696                 pr_debug("create_direct virq allocation failed\n");
 697                 return 0;
 698         }
 699         if (virq >= domain->hwirq_max) {
 700                 pr_err("ERROR: no free irqs available below %lu maximum\n",
 701                         domain->hwirq_max);
 702                 irq_free_desc(virq);
 703                 return 0;
 704         }
 705         pr_debug("create_direct obtained virq %d\n", virq);
 706
 707         if (irq_domain_associate(domain, virq, virq)) {
 708                 irq_free_desc(virq);
 709                 return 0;
 710         }
 711
 712         return virq;
 713 }
 714 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
 715 #endif
 716
 717 static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
 718                                                        irq_hw_number_t hwirq,
 719                                                        const struct irq_affinity_desc *affinity)
 720 {
 721         struct device_node *of_node = irq_domain_get_of_node(domain);
 722         int virq;
 723
 724         pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
 725
 726         /* Allocate a virtual interrupt number */
 727         virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
 728                                       affinity);
 729         if (virq <= 0) {
 730                 pr_debug("-> virq allocation failed\n");
 731                 return 0;
 732         }
 733
 734         if (irq_domain_associate_locked(domain, virq, hwirq)) {
 735                 irq_free_desc(virq);
 736                 return 0;
 737         }
 738
 739         pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
 740                 hwirq, of_node_full_name(of_node), virq);
 741
 742         return virq;
 743 }
 744
 745 /**
 746  * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
 747  * @domain: domain owning this hardware interrupt or NULL for default domain
 748  * @hwirq: hardware irq number in that domain space
 749  * @affinity: irq affinity
 750  *
 751  * Only one mapping per hardware interrupt is permitted. Returns a linux
 752  * irq number.
 753  * If the sense/trigger is to be specified, set_irq_type() should be called
 754  * on the number returned from that call.
 755  */
 756 unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
 757                                          irq_hw_number_t hwirq,
 758                                          const struct irq_affinity_desc *affinity)
 759 {
 760         int virq;
 761
 762         /* Look for default domain if necessary */
 763         if (domain == NULL)
 764                 domain = irq_default_domain;
 765         if (domain == NULL) {
 766                 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
 767                 return 0;
 768         }
 769
 770         mutex_lock(&domain->root->mutex);
 771
 772         /* Check if mapping already exists */
 773         virq = irq_find_mapping(domain, hwirq);
 774         if (virq) {
 775                 pr_debug("existing mapping on virq %d\n", virq);
 776                 goto out;
 777         }
 778
 779         virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
 780 out:
 781         mutex_unlock(&domain->root->mutex);
 782
 783         return virq;
 784 }
 785 EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
 786
 787 static int irq_domain_translate(struct irq_domain *d,
 788                                 struct irq_fwspec *fwspec,
 789                                 irq_hw_number_t *hwirq, unsigned int *type)
 790 {
 791 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 792         if (d->ops->translate)
 793                 return d->ops->translate(d, fwspec, hwirq, type);
 794 #endif
 795         if (d->ops->xlate)
 796                 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
 797                                      fwspec->param, fwspec->param_count,
 798                                      hwirq, type);
 799
 800         /* If domain has no translation, then we assume interrupt line */
 801         *hwirq = fwspec->param[0];
 802         return 0;
 803 }
 804
 805 void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
 806                                unsigned int count, struct irq_fwspec *fwspec)
 807 {
 808         int i;
 809
 810         fwspec->fwnode = of_node_to_fwnode(np);
 811         fwspec->param_count = count;
 812
 813         for (i = 0; i < count; i++)
 814                 fwspec->param[i] = args[i];
 815 }
 816 EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
 817
 818 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
 819 {
 820         struct irq_domain *domain;
 821         struct irq_data *irq_data;
 822         irq_hw_number_t hwirq;
 823         unsigned int type = IRQ_TYPE_NONE;
 824         int virq;
 825
 826         if (fwspec->fwnode) {
 827                 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
 828                 if (!domain)
 829                         domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
 830         } else {
 831                 domain = irq_default_domain;
 832         }
 833
 834         if (!domain) {
 835                 pr_warn("no irq domain found for %s !\n",
 836                         of_node_full_name(to_of_node(fwspec->fwnode)));
 837                 return 0;
 838         }
 839
 840         if (irq_domain_translate(domain, fwspec, &hwirq, &type))
 841                 return 0;
 842
 843         /*
 844          * WARN if the irqchip returns a type with bits
 845          * outside the sense mask set and clear these bits.
 846          */
 847         if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
 848                 type &= IRQ_TYPE_SENSE_MASK;
 849
 850         mutex_lock(&domain->root->mutex);
 851
 852         /*
 853          * If we've already configured this interrupt,
 854          * don't do it again, or hell will break loose.
 855          */
 856         virq = irq_find_mapping(domain, hwirq);
 857         if (virq) {
 858                 /*
 859                  * If the trigger type is not specified or matches the
 860                  * current trigger type then we are done so return the
 861                  * interrupt number.
 862                  */
 863                 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
 864                         goto out;
 865
 866                 /*
 867                  * If the trigger type has not been set yet, then set
 868                  * it now and return the interrupt number.
 869                  */
 870                 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
 871                         irq_data = irq_get_irq_data(virq);
 872                         if (!irq_data) {
 873                                 virq = 0;
 874                                 goto out;
 875                         }
 876
 877                         irqd_set_trigger_type(irq_data, type);
 878                         goto out;
 879                 }
 880
 881                 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
 882                         hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
 883                 virq = 0;
 884                 goto out;
 885         }
 886
 887         if (irq_domain_is_hierarchy(domain)) {
 888                 virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
 889                                                     fwspec, false, NULL);
 890                 if (virq <= 0) {
 891                         virq = 0;
 892                         goto out;
 893                 }
 894         } else {
 895                 /* Create mapping */
 896                 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
 897                 if (!virq)
 898                         goto out;
 899         }
 900
 901         irq_data = irq_get_irq_data(virq);
 902         if (WARN_ON(!irq_data)) {
 903                 virq = 0;
 904                 goto out;
 905         }
 906
 907         /* Store trigger type */
 908         irqd_set_trigger_type(irq_data, type);
 909 out:
 910         mutex_unlock(&domain->root->mutex);
 911
 912         return virq;
 913 }
 914 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
 915
 916 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
 917 {
 918         struct irq_fwspec fwspec;
 919
 920         of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
 921                                   irq_data->args_count, &fwspec);
 922
 923         return irq_create_fwspec_mapping(&fwspec);
 924 }
 925 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 926
 927 /**
 928  * irq_dispose_mapping() - Unmap an interrupt
 929  * @virq: linux irq number of the interrupt to unmap
 930  */
 931 void irq_dispose_mapping(unsigned int virq)
 932 {
 933         struct irq_data *irq_data = irq_get_irq_data(virq);
 934         struct irq_domain *domain;
 935
 936         if (!virq || !irq_data)
 937                 return;
 938
 939         domain = irq_data->domain;
 940         if (WARN_ON(domain == NULL))
 941                 return;
 942
 943         if (irq_domain_is_hierarchy(domain)) {
 944                 irq_domain_free_irqs(virq, 1);
 945         } else {
 946                 irq_domain_disassociate(domain, virq);
 947                 irq_free_desc(virq);
 948         }
 949 }
 950 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 951
 952 /**
 953  * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
 954  * @domain: domain owning this hardware interrupt
 955  * @hwirq: hardware irq number in that domain space
 956  * @irq: optional pointer to return the Linux irq if required
 957  *
 958  * Returns the interrupt descriptor.
 959  */
 960 struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
 961                                        irq_hw_number_t hwirq,
 962                                        unsigned int *irq)
 963 {
 964         struct irq_desc *desc = NULL;
 965         struct irq_data *data;
 966
 967         /* Look for default domain if necessary */
 968         if (domain == NULL)
 969                 domain = irq_default_domain;
 970         if (domain == NULL)
 971                 return desc;
 972
 973         if (irq_domain_is_nomap(domain)) {
 974                 if (hwirq < domain->hwirq_max) {
 975                         data = irq_domain_get_irq_data(domain, hwirq);
 976                         if (data && data->hwirq == hwirq)
 977                                 desc = irq_data_to_desc(data);
 978                         if (irq && desc)
 979                                 *irq = hwirq;
 980                 }
 981
 982                 return desc;
 983         }
 984
 985         rcu_read_lock();
 986         /* Check if the hwirq is in the linear revmap. */
 987         if (hwirq < domain->revmap_size)
 988                 data = rcu_dereference(domain->revmap[hwirq]);
 989         else
 990                 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
 991
 992         if (likely(data)) {
 993                 desc = irq_data_to_desc(data);
 994                 if (irq)
 995                         *irq = data->irq;
 996         }
 997
 998         rcu_read_unlock();
 999         return desc;
1000 }
1001 EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
1002
1003 /**
1004  * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
1005  *
1006  * Device Tree IRQ specifier translation function which works with one cell
1007  * bindings where the cell value maps directly to the hwirq number.
1008  */
1009 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
1010                              const u32 *intspec, unsigned int intsize,
1011                              unsigned long *out_hwirq, unsigned int *out_type)
1012 {
1013         if (WARN_ON(intsize < 1))
1014                 return -EINVAL;
1015         *out_hwirq = intspec[0];
1016         *out_type = IRQ_TYPE_NONE;
1017         return 0;
1018 }
1019 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
1020
1021 /**
1022  * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1023  *
1024  * Device Tree IRQ specifier translation function which works with two cell
1025  * bindings where the cell values map directly to the hwirq number
1026  * and linux irq flags.
1027  */
1028 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1029                         const u32 *intspec, unsigned int intsize,
1030                         irq_hw_number_t *out_hwirq, unsigned int *out_type)
1031 {
1032         struct irq_fwspec fwspec;
1033
1034         of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1035         return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1036 }
1037 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1038
1039 /**
1040  * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1041  *
1042  * Device Tree IRQ specifier translation function which works with either one
1043  * or two cell bindings where the cell values map directly to the hwirq number
1044  * and linux irq flags.
1045  *
1046  * Note: don't use this function unless your interrupt controller explicitly
1047  * supports both one and two cell bindings.  For the majority of controllers
1048  * the _onecell() or _twocell() variants above should be used.
1049  */
1050 int irq_domain_xlate_onetwocell(struct irq_domain *d,
1051                                 struct device_node *ctrlr,
1052                                 const u32 *intspec, unsigned int intsize,
1053                                 unsigned long *out_hwirq, unsigned int *out_type)
1054 {
1055         if (WARN_ON(intsize < 1))
1056                 return -EINVAL;
1057         *out_hwirq = intspec[0];
1058         if (intsize > 1)
1059                 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1060         else
1061                 *out_type = IRQ_TYPE_NONE;
1062         return 0;
1063 }
1064 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1065
1066 const struct irq_domain_ops irq_domain_simple_ops = {
1067         .xlate = irq_domain_xlate_onetwocell,
1068 };
1069 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1070
1071 /**
1072  * irq_domain_translate_onecell() - Generic translate for direct one cell
1073  * bindings
1074  */
1075 int irq_domain_translate_onecell(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 < 1))
1081                 return -EINVAL;
1082         *out_hwirq = fwspec->param[0];
1083         *out_type = IRQ_TYPE_NONE;
1084         return 0;
1085 }
1086 EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1087
1088 /**
1089  * irq_domain_translate_twocell() - Generic translate for direct two cell
1090  * bindings
1091  *
1092  * Device Tree IRQ specifier translation function which works with two cell
1093  * bindings where the cell values map directly to the hwirq number
1094  * and linux irq flags.
1095  */
1096 int irq_domain_translate_twocell(struct irq_domain *d,
1097                                  struct irq_fwspec *fwspec,
1098                                  unsigned long *out_hwirq,
1099                                  unsigned int *out_type)
1100 {
1101         if (WARN_ON(fwspec->param_count < 2))
1102                 return -EINVAL;
1103         *out_hwirq = fwspec->param[0];
1104         *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1105         return 0;
1106 }
1107 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1108
1109 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1110                            int node, const struct irq_affinity_desc *affinity)
1111 {
1112         unsigned int hint;
1113
1114         if (virq >= 0) {
1115                 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1116                                          affinity);
1117         } else {
1118                 hint = hwirq % nr_irqs;
1119                 if (hint == 0)
1120                         hint++;
1121                 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1122                                          affinity);
1123                 if (virq <= 0 && hint > 1) {
1124                         virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1125                                                  affinity);
1126                 }
1127         }
1128
1129         return virq;
1130 }
1131
1132 /**
1133  * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1134  * @irq_data:   The pointer to irq_data
1135  */
1136 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1137 {
1138         irq_data->hwirq = 0;
1139         irq_data->chip = &no_irq_chip;
1140         irq_data->chip_data = NULL;
1141 }
1142 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1143
1144 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1145 /**
1146  * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1147  * @parent:     Parent irq domain to associate with the new domain
1148  * @flags:      Irq domain flags associated to the domain
1149  * @size:       Size of the domain. See below
1150  * @fwnode:     Optional fwnode of the interrupt controller
1151  * @ops:        Pointer to the interrupt domain callbacks
1152  * @host_data:  Controller private data pointer
1153  *
1154  * If @size is 0 a tree domain is created, otherwise a linear domain.
1155  *
1156  * If successful the parent is associated to the new domain and the
1157  * domain flags are set.
1158  * Returns pointer to IRQ domain, or NULL on failure.
1159  */
1160 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1161                                             unsigned int flags,
1162                                             unsigned int size,
1163                                             struct fwnode_handle *fwnode,
1164                                             const struct irq_domain_ops *ops,
1165                                             void *host_data)
1166 {
1167         struct irq_domain *domain;
1168
1169         if (size)
1170                 domain = __irq_domain_create(fwnode, size, size, 0, ops, host_data);
1171         else
1172                 domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
1173
1174         if (domain) {
1175                 domain->root = parent->root;
1176                 domain->parent = parent;
1177                 domain->flags |= flags;
1178
1179                 __irq_domain_publish(domain);
1180         }
1181
1182         return domain;
1183 }
1184 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1185
1186 static void irq_domain_insert_irq(int virq)
1187 {
1188         struct irq_data *data;
1189
1190         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1191                 struct irq_domain *domain = data->domain;
1192
1193                 domain->mapcount++;
1194                 irq_domain_set_mapping(domain, data->hwirq, data);
1195         }
1196
1197         irq_clear_status_flags(virq, IRQ_NOREQUEST);
1198 }
1199
1200 static void irq_domain_remove_irq(int virq)
1201 {
1202         struct irq_data *data;
1203
1204         irq_set_status_flags(virq, IRQ_NOREQUEST);
1205         irq_set_chip_and_handler(virq, NULL, NULL);
1206         synchronize_irq(virq);
1207         smp_mb();
1208
1209         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1210                 struct irq_domain *domain = data->domain;
1211                 irq_hw_number_t hwirq = data->hwirq;
1212
1213                 domain->mapcount--;
1214                 irq_domain_clear_mapping(domain, hwirq);
1215         }
1216 }
1217
1218 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1219                                                    struct irq_data *child)
1220 {
1221         struct irq_data *irq_data;
1222
1223         irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1224                                 irq_data_get_node(child));
1225         if (irq_data) {
1226                 child->parent_data = irq_data;
1227                 irq_data->irq = child->irq;
1228                 irq_data->common = child->common;
1229                 irq_data->domain = domain;
1230         }
1231
1232         return irq_data;
1233 }
1234
1235 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1236 {
1237         struct irq_data *tmp;
1238
1239         while (irq_data) {
1240                 tmp = irq_data;
1241                 irq_data = irq_data->parent_data;
1242                 kfree(tmp);
1243         }
1244 }
1245
1246 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1247 {
1248         struct irq_data *irq_data, *tmp;
1249         int i;
1250
1251         for (i = 0; i < nr_irqs; i++) {
1252                 irq_data = irq_get_irq_data(virq + i);
1253                 tmp = irq_data->parent_data;
1254                 irq_data->parent_data = NULL;
1255                 irq_data->domain = NULL;
1256
1257                 __irq_domain_free_hierarchy(tmp);
1258         }
1259 }
1260
1261 /**
1262  * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1263  * @domain:     IRQ domain from which the hierarchy is to be disconnected
1264  * @virq:       IRQ number where the hierarchy is to be trimmed
1265  *
1266  * Marks the @virq level belonging to @domain as disconnected.
1267  * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1268  * to @domain.
1269  *
1270  * Its only use is to be able to trim levels of hierarchy that do not
1271  * have any real meaning for this interrupt, and that the driver marks
1272  * as such from its .alloc() callback.
1273  */
1274 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1275                                     unsigned int virq)
1276 {
1277         struct irq_data *irqd;
1278
1279         irqd = irq_domain_get_irq_data(domain, virq);
1280         if (!irqd)
1281                 return -EINVAL;
1282
1283         irqd->chip = ERR_PTR(-ENOTCONN);
1284         return 0;
1285 }
1286 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1287
1288 static int irq_domain_trim_hierarchy(unsigned int virq)
1289 {
1290         struct irq_data *tail, *irqd, *irq_data;
1291
1292         irq_data = irq_get_irq_data(virq);
1293         tail = NULL;
1294
1295         /* The first entry must have a valid irqchip */
1296         if (!irq_data->chip || IS_ERR(irq_data->chip))
1297                 return -EINVAL;
1298
1299         /*
1300          * Validate that the irq_data chain is sane in the presence of
1301          * a hierarchy trimming marker.
1302          */
1303         for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1304                 /* Can't have a valid irqchip after a trim marker */
1305                 if (irqd->chip && tail)
1306                         return -EINVAL;
1307
1308                 /* Can't have an empty irqchip before a trim marker */
1309                 if (!irqd->chip && !tail)
1310                         return -EINVAL;
1311
1312                 if (IS_ERR(irqd->chip)) {
1313                         /* Only -ENOTCONN is a valid trim marker */
1314                         if (PTR_ERR(irqd->chip) != -ENOTCONN)
1315                                 return -EINVAL;
1316
1317                         tail = irq_data;
1318                 }
1319         }
1320
1321         /* No trim marker, nothing to do */
1322         if (!tail)
1323                 return 0;
1324
1325         pr_info("IRQ%d: trimming hierarchy from %s\n",
1326                 virq, tail->parent_data->domain->name);
1327
1328         /* Sever the inner part of the hierarchy...  */
1329         irqd = tail;
1330         tail = tail->parent_data;
1331         irqd->parent_data = NULL;
1332         __irq_domain_free_hierarchy(tail);
1333
1334         return 0;
1335 }
1336
1337 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1338                                      unsigned int virq, unsigned int nr_irqs)
1339 {
1340         struct irq_data *irq_data;
1341         struct irq_domain *parent;
1342         int i;
1343
1344         /* The outermost irq_data is embedded in struct irq_desc */
1345         for (i = 0; i < nr_irqs; i++) {
1346                 irq_data = irq_get_irq_data(virq + i);
1347                 irq_data->domain = domain;
1348
1349                 for (parent = domain->parent; parent; parent = parent->parent) {
1350                         irq_data = irq_domain_insert_irq_data(parent, irq_data);
1351                         if (!irq_data) {
1352                                 irq_domain_free_irq_data(virq, i + 1);
1353                                 return -ENOMEM;
1354                         }
1355                 }
1356         }
1357
1358         return 0;
1359 }
1360
1361 /**
1362  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1363  * @domain:     domain to match
1364  * @virq:       IRQ number to get irq_data
1365  */
1366 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1367                                          unsigned int virq)
1368 {
1369         struct irq_data *irq_data;
1370
1371         for (irq_data = irq_get_irq_data(virq); irq_data;
1372              irq_data = irq_data->parent_data)
1373                 if (irq_data->domain == domain)
1374                         return irq_data;
1375
1376         return NULL;
1377 }
1378 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1379
1380 /**
1381  * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1382  * @domain:     Interrupt domain to match
1383  * @virq:       IRQ number
1384  * @hwirq:      The hwirq number
1385  * @chip:       The associated interrupt chip
1386  * @chip_data:  The associated chip data
1387  */
1388 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1389                                   irq_hw_number_t hwirq,
1390                                   const struct irq_chip *chip,
1391                                   void *chip_data)
1392 {
1393         struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1394
1395         if (!irq_data)
1396                 return -ENOENT;
1397
1398         irq_data->hwirq = hwirq;
1399         irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1400         irq_data->chip_data = chip_data;
1401
1402         return 0;
1403 }
1404 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1405
1406 /**
1407  * irq_domain_set_info - Set the complete data for a @virq in @domain
1408  * @domain:             Interrupt domain to match
1409  * @virq:               IRQ number
1410  * @hwirq:              The hardware interrupt number
1411  * @chip:               The associated interrupt chip
1412  * @chip_data:          The associated interrupt chip data
1413  * @handler:            The interrupt flow handler
1414  * @handler_data:       The interrupt flow handler data
1415  * @handler_name:       The interrupt handler name
1416  */
1417 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1418                          irq_hw_number_t hwirq, const struct irq_chip *chip,
1419                          void *chip_data, irq_flow_handler_t handler,
1420                          void *handler_data, const char *handler_name)
1421 {
1422         irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1423         __irq_set_handler(virq, handler, 0, handler_name);
1424         irq_set_handler_data(virq, handler_data);
1425 }
1426 EXPORT_SYMBOL(irq_domain_set_info);
1427
1428 /**
1429  * irq_domain_free_irqs_common - Clear irq_data and free the parent
1430  * @domain:     Interrupt domain to match
1431  * @virq:       IRQ number to start with
1432  * @nr_irqs:    The number of irqs to free
1433  */
1434 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1435                                  unsigned int nr_irqs)
1436 {
1437         struct irq_data *irq_data;
1438         int i;
1439
1440         for (i = 0; i < nr_irqs; i++) {
1441                 irq_data = irq_domain_get_irq_data(domain, virq + i);
1442                 if (irq_data)
1443                         irq_domain_reset_irq_data(irq_data);
1444         }
1445         irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1446 }
1447 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1448
1449 /**
1450  * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1451  * @domain:     Interrupt domain to match
1452  * @virq:       IRQ number to start with
1453  * @nr_irqs:    The number of irqs to free
1454  */
1455 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1456                               unsigned int nr_irqs)
1457 {
1458         int i;
1459
1460         for (i = 0; i < nr_irqs; i++) {
1461                 irq_set_handler_data(virq + i, NULL);
1462                 irq_set_handler(virq + i, NULL);
1463         }
1464         irq_domain_free_irqs_common(domain, virq, nr_irqs);
1465 }
1466
1467 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1468                                            unsigned int irq_base,
1469                                            unsigned int nr_irqs)
1470 {
1471         unsigned int i;
1472
1473         if (!domain->ops->free)
1474                 return;
1475
1476         for (i = 0; i < nr_irqs; i++) {
1477                 if (irq_domain_get_irq_data(domain, irq_base + i))
1478                         domain->ops->free(domain, irq_base + i, 1);
1479         }
1480 }
1481
1482 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1483                                     unsigned int irq_base,
1484                                     unsigned int nr_irqs, void *arg)
1485 {
1486         if (!domain->ops->alloc) {
1487                 pr_debug("domain->ops->alloc() is NULL\n");
1488                 return -ENOSYS;
1489         }
1490
1491         return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1492 }
1493
1494 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1495                                         unsigned int nr_irqs, int node, void *arg,
1496                                         bool realloc, const struct irq_affinity_desc *affinity)
1497 {
1498         int i, ret, virq;
1499
1500         if (realloc && irq_base >= 0) {
1501                 virq = irq_base;
1502         } else {
1503                 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1504                                               affinity);
1505                 if (virq < 0) {
1506                         pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1507                                  irq_base, nr_irqs);
1508                         return virq;
1509                 }
1510         }
1511
1512         if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1513                 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1514                 ret = -ENOMEM;
1515                 goto out_free_desc;
1516         }
1517
1518         ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1519         if (ret < 0)
1520                 goto out_free_irq_data;
1521
1522         for (i = 0; i < nr_irqs; i++) {
1523                 ret = irq_domain_trim_hierarchy(virq + i);
1524                 if (ret)
1525                         goto out_free_irq_data;
1526         }
1527
1528         for (i = 0; i < nr_irqs; i++)
1529                 irq_domain_insert_irq(virq + i);
1530
1531         return virq;
1532
1533 out_free_irq_data:
1534         irq_domain_free_irq_data(virq, nr_irqs);
1535 out_free_desc:
1536         irq_free_descs(virq, nr_irqs);
1537         return ret;
1538 }
1539
1540 /**
1541  * __irq_domain_alloc_irqs - Allocate IRQs from domain
1542  * @domain:     domain to allocate from
1543  * @irq_base:   allocate specified IRQ number if irq_base >= 0
1544  * @nr_irqs:    number of IRQs to allocate
1545  * @node:       NUMA node id for memory allocation
1546  * @arg:        domain specific argument
1547  * @realloc:    IRQ descriptors have already been allocated if true
1548  * @affinity:   Optional irq affinity mask for multiqueue devices
1549  *
1550  * Allocate IRQ numbers and initialized all data structures to support
1551  * hierarchy IRQ domains.
1552  * Parameter @realloc is mainly to support legacy IRQs.
1553  * Returns error code or allocated IRQ number
1554  *
1555  * The whole process to setup an IRQ has been split into two steps.
1556  * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1557  * descriptor and required hardware resources. The second step,
1558  * irq_domain_activate_irq(), is to program the hardware with preallocated
1559  * resources. In this way, it's easier to rollback when failing to
1560  * allocate resources.
1561  */
1562 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1563                             unsigned int nr_irqs, int node, void *arg,
1564                             bool realloc, const struct irq_affinity_desc *affinity)
1565 {
1566         int ret;
1567
1568         if (domain == NULL) {
1569                 domain = irq_default_domain;
1570                 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1571                         return -EINVAL;
1572         }
1573
1574         mutex_lock(&domain->root->mutex);
1575         ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1576                                            realloc, affinity);
1577         mutex_unlock(&domain->root->mutex);
1578
1579         return ret;
1580 }
1581 EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1582
1583 /* The irq_data was moved, fix the revmap to refer to the new location */
1584 static void irq_domain_fix_revmap(struct irq_data *d)
1585 {
1586         void __rcu **slot;
1587
1588         lockdep_assert_held(&d->domain->root->mutex);
1589
1590         if (irq_domain_is_nomap(d->domain))
1591                 return;
1592
1593         /* Fix up the revmap. */
1594         if (d->hwirq < d->domain->revmap_size) {
1595                 /* Not using radix tree */
1596                 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1597         } else {
1598                 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1599                 if (slot)
1600                         radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1601         }
1602 }
1603
1604 /**
1605  * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1606  * @domain:     Domain to push.
1607  * @virq:       Irq to push the domain in to.
1608  * @arg:        Passed to the irq_domain_ops alloc() function.
1609  *
1610  * For an already existing irqdomain hierarchy, as might be obtained
1611  * via a call to pci_enable_msix(), add an additional domain to the
1612  * head of the processing chain.  Must be called before request_irq()
1613  * has been called.
1614  */
1615 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1616 {
1617         struct irq_data *irq_data = irq_get_irq_data(virq);
1618         struct irq_data *parent_irq_data;
1619         struct irq_desc *desc;
1620         int rv = 0;
1621
1622         /*
1623          * Check that no action has been set, which indicates the virq
1624          * is in a state where this function doesn't have to deal with
1625          * races between interrupt handling and maintaining the
1626          * hierarchy.  This will catch gross misuse.  Attempting to
1627          * make the check race free would require holding locks across
1628          * calls to struct irq_domain_ops->alloc(), which could lead
1629          * to deadlock, so we just do a simple check before starting.
1630          */
1631         desc = irq_to_desc(virq);
1632         if (!desc)
1633                 return -EINVAL;
1634         if (WARN_ON(desc->action))
1635                 return -EBUSY;
1636
1637         if (domain == NULL)
1638                 return -EINVAL;
1639
1640         if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1641                 return -EINVAL;
1642
1643         if (!irq_data)
1644                 return -EINVAL;
1645
1646         if (domain->parent != irq_data->domain)
1647                 return -EINVAL;
1648
1649         parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1650                                        irq_data_get_node(irq_data));
1651         if (!parent_irq_data)
1652                 return -ENOMEM;
1653
1654         mutex_lock(&domain->root->mutex);
1655
1656         /* Copy the original irq_data. */
1657         *parent_irq_data = *irq_data;
1658
1659         /*
1660          * Overwrite the irq_data, which is embedded in struct irq_desc, with
1661          * values for this domain.
1662          */
1663         irq_data->parent_data = parent_irq_data;
1664         irq_data->domain = domain;
1665         irq_data->mask = 0;
1666         irq_data->hwirq = 0;
1667         irq_data->chip = NULL;
1668         irq_data->chip_data = NULL;
1669
1670         /* May (probably does) set hwirq, chip, etc. */
1671         rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1672         if (rv) {
1673                 /* Restore the original irq_data. */
1674                 *irq_data = *parent_irq_data;
1675                 kfree(parent_irq_data);
1676                 goto error;
1677         }
1678
1679         irq_domain_fix_revmap(parent_irq_data);
1680         irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
1681 error:
1682         mutex_unlock(&domain->root->mutex);
1683
1684         return rv;
1685 }
1686 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1687
1688 /**
1689  * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1690  * @domain:     Domain to remove.
1691  * @virq:       Irq to remove the domain from.
1692  *
1693  * Undo the effects of a call to irq_domain_push_irq().  Must be
1694  * called either before request_irq() or after free_irq().
1695  */
1696 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1697 {
1698         struct irq_data *irq_data = irq_get_irq_data(virq);
1699         struct irq_data *parent_irq_data;
1700         struct irq_data *tmp_irq_data;
1701         struct irq_desc *desc;
1702
1703         /*
1704          * Check that no action is set, which indicates the virq is in
1705          * a state where this function doesn't have to deal with races
1706          * between interrupt handling and maintaining the hierarchy.
1707          * This will catch gross misuse.  Attempting to make the check
1708          * race free would require holding locks across calls to
1709          * struct irq_domain_ops->free(), which could lead to
1710          * deadlock, so we just do a simple check before starting.
1711          */
1712         desc = irq_to_desc(virq);
1713         if (!desc)
1714                 return -EINVAL;
1715         if (WARN_ON(desc->action))
1716                 return -EBUSY;
1717
1718         if (domain == NULL)
1719                 return -EINVAL;
1720
1721         if (!irq_data)
1722                 return -EINVAL;
1723
1724         tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1725
1726         /* We can only "pop" if this domain is at the top of the list */
1727         if (WARN_ON(irq_data != tmp_irq_data))
1728                 return -EINVAL;
1729
1730         if (WARN_ON(irq_data->domain != domain))
1731                 return -EINVAL;
1732
1733         parent_irq_data = irq_data->parent_data;
1734         if (WARN_ON(!parent_irq_data))
1735                 return -EINVAL;
1736
1737         mutex_lock(&domain->root->mutex);
1738
1739         irq_data->parent_data = NULL;
1740
1741         irq_domain_clear_mapping(domain, irq_data->hwirq);
1742         irq_domain_free_irqs_hierarchy(domain, virq, 1);
1743
1744         /* Restore the original irq_data. */
1745         *irq_data = *parent_irq_data;
1746
1747         irq_domain_fix_revmap(irq_data);
1748
1749         mutex_unlock(&domain->root->mutex);
1750
1751         kfree(parent_irq_data);
1752
1753         return 0;
1754 }
1755 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1756
1757 /**
1758  * irq_domain_free_irqs - Free IRQ number and associated data structures
1759  * @virq:       base IRQ number
1760  * @nr_irqs:    number of IRQs to free
1761  */
1762 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1763 {
1764         struct irq_data *data = irq_get_irq_data(virq);
1765         struct irq_domain *domain;
1766         int i;
1767
1768         if (WARN(!data || !data->domain || !data->domain->ops->free,
1769                  "NULL pointer, cannot free irq\n"))
1770                 return;
1771
1772         domain = data->domain;
1773
1774         mutex_lock(&domain->root->mutex);
1775         for (i = 0; i < nr_irqs; i++)
1776                 irq_domain_remove_irq(virq + i);
1777         irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
1778         mutex_unlock(&domain->root->mutex);
1779
1780         irq_domain_free_irq_data(virq, nr_irqs);
1781         irq_free_descs(virq, nr_irqs);
1782 }
1783
1784 /**
1785  * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1786  * @domain:     Domain below which interrupts must be allocated
1787  * @irq_base:   Base IRQ number
1788  * @nr_irqs:    Number of IRQs to allocate
1789  * @arg:        Allocation data (arch/domain specific)
1790  */
1791 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1792                                  unsigned int irq_base, unsigned int nr_irqs,
1793                                  void *arg)
1794 {
1795         if (!domain->parent)
1796                 return -ENOSYS;
1797
1798         return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1799                                                nr_irqs, arg);
1800 }
1801 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1802
1803 /**
1804  * irq_domain_free_irqs_parent - Free interrupts from parent domain
1805  * @domain:     Domain below which interrupts must be freed
1806  * @irq_base:   Base IRQ number
1807  * @nr_irqs:    Number of IRQs to free
1808  */
1809 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1810                                  unsigned int irq_base, unsigned int nr_irqs)
1811 {
1812         if (!domain->parent)
1813                 return;
1814
1815         irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1816 }
1817 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1818
1819 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1820 {
1821         if (irq_data && irq_data->domain) {
1822                 struct irq_domain *domain = irq_data->domain;
1823
1824                 if (domain->ops->deactivate)
1825                         domain->ops->deactivate(domain, irq_data);
1826                 if (irq_data->parent_data)
1827                         __irq_domain_deactivate_irq(irq_data->parent_data);
1828         }
1829 }
1830
1831 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1832 {
1833         int ret = 0;
1834
1835         if (irqd && irqd->domain) {
1836                 struct irq_domain *domain = irqd->domain;
1837
1838                 if (irqd->parent_data)
1839                         ret = __irq_domain_activate_irq(irqd->parent_data,
1840                                                         reserve);
1841                 if (!ret && domain->ops->activate) {
1842                         ret = domain->ops->activate(domain, irqd, reserve);
1843                         /* Rollback in case of error */
1844                         if (ret && irqd->parent_data)
1845                                 __irq_domain_deactivate_irq(irqd->parent_data);
1846                 }
1847         }
1848         return ret;
1849 }
1850
1851 /**
1852  * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1853  *                           interrupt
1854  * @irq_data:   Outermost irq_data associated with interrupt
1855  * @reserve:    If set only reserve an interrupt vector instead of assigning one
1856  *
1857  * This is the second step to call domain_ops->activate to program interrupt
1858  * controllers, so the interrupt could actually get delivered.
1859  */
1860 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1861 {
1862         int ret = 0;
1863
1864         if (!irqd_is_activated(irq_data))
1865                 ret = __irq_domain_activate_irq(irq_data, reserve);
1866         if (!ret)
1867                 irqd_set_activated(irq_data);
1868         return ret;
1869 }
1870
1871 /**
1872  * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1873  *                             deactivate interrupt
1874  * @irq_data: outermost irq_data associated with interrupt
1875  *
1876  * It calls domain_ops->deactivate to program interrupt controllers to disable
1877  * interrupt delivery.
1878  */
1879 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1880 {
1881         if (irqd_is_activated(irq_data)) {
1882                 __irq_domain_deactivate_irq(irq_data);
1883                 irqd_clr_activated(irq_data);
1884         }
1885 }
1886
1887 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1888 {
1889         /* Hierarchy irq_domains must implement callback alloc() */
1890         if (domain->ops->alloc)
1891                 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1892 }
1893
1894 /**
1895  * irq_domain_hierarchical_is_msi_remap - Check if the domain or any
1896  * parent has MSI remapping support
1897  * @domain: domain pointer
1898  */
1899 bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
1900 {
1901         for (; domain; domain = domain->parent) {
1902                 if (irq_domain_is_msi_remap(domain))
1903                         return true;
1904         }
1905         return false;
1906 }
1907 #else   /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1908 /**
1909  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1910  * @domain:     domain to match
1911  * @virq:       IRQ number to get irq_data
1912  */
1913 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1914                                          unsigned int virq)
1915 {
1916         struct irq_data *irq_data = irq_get_irq_data(virq);
1917
1918         return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1919 }
1920 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1921
1922 /**
1923  * irq_domain_set_info - Set the complete data for a @virq in @domain
1924  * @domain:             Interrupt domain to match
1925  * @virq:               IRQ number
1926  * @hwirq:              The hardware interrupt number
1927  * @chip:               The associated interrupt chip
1928  * @chip_data:          The associated interrupt chip data
1929  * @handler:            The interrupt flow handler
1930  * @handler_data:       The interrupt flow handler data
1931  * @handler_name:       The interrupt handler name
1932  */
1933 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1934                          irq_hw_number_t hwirq, const struct irq_chip *chip,
1935                          void *chip_data, irq_flow_handler_t handler,
1936                          void *handler_data, const char *handler_name)
1937 {
1938         irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1939         irq_set_chip_data(virq, chip_data);
1940         irq_set_handler_data(virq, handler_data);
1941 }
1942
1943 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1944                                         unsigned int nr_irqs, int node, void *arg,
1945                                         bool realloc, const struct irq_affinity_desc *affinity)
1946 {
1947         return -EINVAL;
1948 }
1949
1950 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1951 {
1952 }
1953 #endif  /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1954
1955 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1956 static struct dentry *domain_dir;
1957
1958 static void
1959 irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1960 {
1961         seq_printf(m, "%*sname:   %s\n", ind, "", d->name);
1962         seq_printf(m, "%*ssize:   %u\n", ind + 1, "", d->revmap_size);
1963         seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1964         seq_printf(m, "%*sflags:  0x%08x\n", ind +1 , "", d->flags);
1965         if (d->ops && d->ops->debug_show)
1966                 d->ops->debug_show(m, d, NULL, ind + 1);
1967 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1968         if (!d->parent)
1969                 return;
1970         seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1971         irq_domain_debug_show_one(m, d->parent, ind + 4);
1972 #endif
1973 }
1974
1975 static int irq_domain_debug_show(struct seq_file *m, void *p)
1976 {
1977         struct irq_domain *d = m->private;
1978
1979         /* Default domain? Might be NULL */
1980         if (!d) {
1981                 if (!irq_default_domain)
1982                         return 0;
1983                 d = irq_default_domain;
1984         }
1985         irq_domain_debug_show_one(m, d, 0);
1986         return 0;
1987 }
1988 DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1989
1990 static void debugfs_add_domain_dir(struct irq_domain *d)
1991 {
1992         if (!d->name || !domain_dir)
1993                 return;
1994         debugfs_create_file(d->name, 0444, domain_dir, d,
1995                             &irq_domain_debug_fops);
1996 }
1997
1998 static void debugfs_remove_domain_dir(struct irq_domain *d)
1999 {
2000         debugfs_lookup_and_remove(d->name, domain_dir);
2001 }
2002
2003 void __init irq_domain_debugfs_init(struct dentry *root)
2004 {
2005         struct irq_domain *d;
2006
2007         domain_dir = debugfs_create_dir("domains", root);
2008
2009         debugfs_create_file("default", 0444, domain_dir, NULL,
2010                             &irq_domain_debug_fops);
2011         mutex_lock(&irq_domain_mutex);
2012         list_for_each_entry(d, &irq_domain_list, link)
2013                 debugfs_add_domain_dir(d);
2014         mutex_unlock(&irq_domain_mutex);
2015 }
2016 #endif