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_set_default_host() - Set a "default" irq domain
 474  * @domain: default domain pointer
 475  *
 476  * For convenience, it's possible to set a "default" domain that will be used
 477  * whenever NULL is passed to irq_create_mapping(). It makes life easier for
 478  * platforms that want to manipulate a few hard coded interrupt numbers that
 479  * aren't properly represented in the device-tree.
 480  */
 481 void irq_set_default_host(struct irq_domain *domain)
 482 {
 483         pr_debug("Default domain set to @0x%p\n", domain);
 484
 485         irq_default_domain = domain;
 486 }
 487 EXPORT_SYMBOL_GPL(irq_set_default_host);
 488
 489 /**
 490  * irq_get_default_host() - Retrieve the "default" irq domain
 491  *
 492  * Returns: the default domain, if any.
 493  *
 494  * Modern code should never use this. This should only be used on
 495  * systems that cannot implement a firmware->fwnode mapping (which
 496  * both DT and ACPI provide).
 497  */
 498 struct irq_domain *irq_get_default_host(void)
 499 {
 500         return irq_default_domain;
 501 }
 502 EXPORT_SYMBOL_GPL(irq_get_default_host);
 503
 504 static bool irq_domain_is_nomap(struct irq_domain *domain)
 505 {
 506         return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
 507                (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
 508 }
 509
 510 static void irq_domain_clear_mapping(struct irq_domain *domain,
 511                                      irq_hw_number_t hwirq)
 512 {
 513         lockdep_assert_held(&domain->root->mutex);
 514
 515         if (irq_domain_is_nomap(domain))
 516                 return;
 517
 518         if (hwirq < domain->revmap_size)
 519                 rcu_assign_pointer(domain->revmap[hwirq], NULL);
 520         else
 521                 radix_tree_delete(&domain->revmap_tree, hwirq);
 522 }
 523
 524 static void irq_domain_set_mapping(struct irq_domain *domain,
 525                                    irq_hw_number_t hwirq,
 526                                    struct irq_data *irq_data)
 527 {
 528         /*
 529          * This also makes sure that all domains point to the same root when
 530          * called from irq_domain_insert_irq() for each domain in a hierarchy.
 531          */
 532         lockdep_assert_held(&domain->root->mutex);
 533
 534         if (irq_domain_is_nomap(domain))
 535                 return;
 536
 537         if (hwirq < domain->revmap_size)
 538                 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
 539         else
 540                 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
 541 }
 542
 543 static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
 544 {
 545         struct irq_data *irq_data = irq_get_irq_data(irq);
 546         irq_hw_number_t hwirq;
 547
 548         if (WARN(!irq_data || irq_data->domain != domain,
 549                  "virq%i doesn't exist; cannot disassociate\n", irq))
 550                 return;
 551
 552         hwirq = irq_data->hwirq;
 553
 554         mutex_lock(&domain->root->mutex);
 555
 556         irq_set_status_flags(irq, IRQ_NOREQUEST);
 557
 558         /* remove chip and handler */
 559         irq_set_chip_and_handler(irq, NULL, NULL);
 560
 561         /* Make sure it's completed */
 562         synchronize_irq(irq);
 563
 564         /* Tell the PIC about it */
 565         if (domain->ops->unmap)
 566                 domain->ops->unmap(domain, irq);
 567         smp_mb();
 568
 569         irq_data->domain = NULL;
 570         irq_data->hwirq = 0;
 571         domain->mapcount--;
 572
 573         /* Clear reverse map for this hwirq */
 574         irq_domain_clear_mapping(domain, hwirq);
 575
 576         mutex_unlock(&domain->root->mutex);
 577 }
 578
 579 static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
 580                                        irq_hw_number_t hwirq)
 581 {
 582         struct irq_data *irq_data = irq_get_irq_data(virq);
 583         int ret;
 584
 585         if (WARN(hwirq >= domain->hwirq_max,
 586                  "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
 587                 return -EINVAL;
 588         if (WARN(!irq_data, "error: virq%i is not allocated", virq))
 589                 return -EINVAL;
 590         if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
 591                 return -EINVAL;
 592
 593         irq_data->hwirq = hwirq;
 594         irq_data->domain = domain;
 595         if (domain->ops->map) {
 596                 ret = domain->ops->map(domain, virq, hwirq);
 597                 if (ret != 0) {
 598                         /*
 599                          * If map() returns -EPERM, this interrupt is protected
 600                          * by the firmware or some other service and shall not
 601                          * be mapped. Don't bother telling the user about it.
 602                          */
 603                         if (ret != -EPERM) {
 604                                 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
 605                                        domain->name, hwirq, virq, ret);
 606                         }
 607                         irq_data->domain = NULL;
 608                         irq_data->hwirq = 0;
 609                         return ret;
 610                 }
 611         }
 612
 613         domain->mapcount++;
 614         irq_domain_set_mapping(domain, hwirq, irq_data);
 615
 616         irq_clear_status_flags(virq, IRQ_NOREQUEST);
 617
 618         return 0;
 619 }
 620
 621 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
 622                          irq_hw_number_t hwirq)
 623 {
 624         int ret;
 625
 626         mutex_lock(&domain->root->mutex);
 627         ret = irq_domain_associate_locked(domain, virq, hwirq);
 628         mutex_unlock(&domain->root->mutex);
 629
 630         return ret;
 631 }
 632 EXPORT_SYMBOL_GPL(irq_domain_associate);
 633
 634 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 635                                irq_hw_number_t hwirq_base, int count)
 636 {
 637         struct device_node *of_node;
 638         int i;
 639
 640         of_node = irq_domain_get_of_node(domain);
 641         pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
 642                 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
 643
 644         for (i = 0; i < count; i++)
 645                 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
 646 }
 647 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
 648
 649 #ifdef CONFIG_IRQ_DOMAIN_NOMAP
 650 /**
 651  * irq_create_direct_mapping() - Allocate an irq for direct mapping
 652  * @domain: domain to allocate the irq for or NULL for default domain
 653  *
 654  * This routine is used for irq controllers which can choose the hardware
 655  * interrupt numbers they generate. In such a case it's simplest to use
 656  * the linux irq as the hardware interrupt number. It still uses the linear
 657  * or radix tree to store the mapping, but the irq controller can optimize
 658  * the revmap path by using the hwirq directly.
 659  */
 660 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 661 {
 662         struct device_node *of_node;
 663         unsigned int virq;
 664
 665         if (domain == NULL)
 666                 domain = irq_default_domain;
 667
 668         of_node = irq_domain_get_of_node(domain);
 669         virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
 670         if (!virq) {
 671                 pr_debug("create_direct virq allocation failed\n");
 672                 return 0;
 673         }
 674         if (virq >= domain->hwirq_max) {
 675                 pr_err("ERROR: no free irqs available below %lu maximum\n",
 676                         domain->hwirq_max);
 677                 irq_free_desc(virq);
 678                 return 0;
 679         }
 680         pr_debug("create_direct obtained virq %d\n", virq);
 681
 682         if (irq_domain_associate(domain, virq, virq)) {
 683                 irq_free_desc(virq);
 684                 return 0;
 685         }
 686
 687         return virq;
 688 }
 689 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
 690 #endif
 691
 692 static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
 693                                                        irq_hw_number_t hwirq,
 694                                                        const struct irq_affinity_desc *affinity)
 695 {
 696         struct device_node *of_node = irq_domain_get_of_node(domain);
 697         int virq;
 698
 699         pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
 700
 701         /* Allocate a virtual interrupt number */
 702         virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
 703                                       affinity);
 704         if (virq <= 0) {
 705                 pr_debug("-> virq allocation failed\n");
 706                 return 0;
 707         }
 708
 709         if (irq_domain_associate_locked(domain, virq, hwirq)) {
 710                 irq_free_desc(virq);
 711                 return 0;
 712         }
 713
 714         pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
 715                 hwirq, of_node_full_name(of_node), virq);
 716
 717         return virq;
 718 }
 719
 720 /**
 721  * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
 722  * @domain: domain owning this hardware interrupt or NULL for default domain
 723  * @hwirq: hardware irq number in that domain space
 724  * @affinity: irq affinity
 725  *
 726  * Only one mapping per hardware interrupt is permitted. Returns a linux
 727  * irq number.
 728  * If the sense/trigger is to be specified, set_irq_type() should be called
 729  * on the number returned from that call.
 730  */
 731 unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
 732                                          irq_hw_number_t hwirq,
 733                                          const struct irq_affinity_desc *affinity)
 734 {
 735         int virq;
 736
 737         /* Look for default domain if necessary */
 738         if (domain == NULL)
 739                 domain = irq_default_domain;
 740         if (domain == NULL) {
 741                 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
 742                 return 0;
 743         }
 744
 745         mutex_lock(&domain->root->mutex);
 746
 747         /* Check if mapping already exists */
 748         virq = irq_find_mapping(domain, hwirq);
 749         if (virq) {
 750                 pr_debug("existing mapping on virq %d\n", virq);
 751                 goto out;
 752         }
 753
 754         virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
 755 out:
 756         mutex_unlock(&domain->root->mutex);
 757
 758         return virq;
 759 }
 760 EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
 761
 762 static int irq_domain_translate(struct irq_domain *d,
 763                                 struct irq_fwspec *fwspec,
 764                                 irq_hw_number_t *hwirq, unsigned int *type)
 765 {
 766 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 767         if (d->ops->translate)
 768                 return d->ops->translate(d, fwspec, hwirq, type);
 769 #endif
 770         if (d->ops->xlate)
 771                 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
 772                                      fwspec->param, fwspec->param_count,
 773                                      hwirq, type);
 774
 775         /* If domain has no translation, then we assume interrupt line */
 776         *hwirq = fwspec->param[0];
 777         return 0;
 778 }
 779
 780 void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
 781                                unsigned int count, struct irq_fwspec *fwspec)
 782 {
 783         int i;
 784
 785         fwspec->fwnode = of_node_to_fwnode(np);
 786         fwspec->param_count = count;
 787
 788         for (i = 0; i < count; i++)
 789                 fwspec->param[i] = args[i];
 790 }
 791 EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
 792
 793 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
 794 {
 795         struct irq_domain *domain;
 796         struct irq_data *irq_data;
 797         irq_hw_number_t hwirq;
 798         unsigned int type = IRQ_TYPE_NONE;
 799         int virq;
 800
 801         if (fwspec->fwnode) {
 802                 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
 803                 if (!domain)
 804                         domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
 805         } else {
 806                 domain = irq_default_domain;
 807         }
 808
 809         if (!domain) {
 810                 pr_warn("no irq domain found for %s !\n",
 811                         of_node_full_name(to_of_node(fwspec->fwnode)));
 812                 return 0;
 813         }
 814
 815         if (irq_domain_translate(domain, fwspec, &hwirq, &type))
 816                 return 0;
 817
 818         /*
 819          * WARN if the irqchip returns a type with bits
 820          * outside the sense mask set and clear these bits.
 821          */
 822         if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
 823                 type &= IRQ_TYPE_SENSE_MASK;
 824
 825         mutex_lock(&domain->root->mutex);
 826
 827         /*
 828          * If we've already configured this interrupt,
 829          * don't do it again, or hell will break loose.
 830          */
 831         virq = irq_find_mapping(domain, hwirq);
 832         if (virq) {
 833                 /*
 834                  * If the trigger type is not specified or matches the
 835                  * current trigger type then we are done so return the
 836                  * interrupt number.
 837                  */
 838                 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
 839                         goto out;
 840
 841                 /*
 842                  * If the trigger type has not been set yet, then set
 843                  * it now and return the interrupt number.
 844                  */
 845                 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
 846                         irq_data = irq_get_irq_data(virq);
 847                         if (!irq_data) {
 848                                 virq = 0;
 849                                 goto out;
 850                         }
 851
 852                         irqd_set_trigger_type(irq_data, type);
 853                         goto out;
 854                 }
 855
 856                 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
 857                         hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
 858                 virq = 0;
 859                 goto out;
 860         }
 861
 862         if (irq_domain_is_hierarchy(domain)) {
 863                 virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
 864                                                     fwspec, false, NULL);
 865                 if (virq <= 0) {
 866                         virq = 0;
 867                         goto out;
 868                 }
 869         } else {
 870                 /* Create mapping */
 871                 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
 872                 if (!virq)
 873                         goto out;
 874         }
 875
 876         irq_data = irq_get_irq_data(virq);
 877         if (WARN_ON(!irq_data)) {
 878                 virq = 0;
 879                 goto out;
 880         }
 881
 882         /* Store trigger type */
 883         irqd_set_trigger_type(irq_data, type);
 884 out:
 885         mutex_unlock(&domain->root->mutex);
 886
 887         return virq;
 888 }
 889 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
 890
 891 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
 892 {
 893         struct irq_fwspec fwspec;
 894
 895         of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
 896                                   irq_data->args_count, &fwspec);
 897
 898         return irq_create_fwspec_mapping(&fwspec);
 899 }
 900 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 901
 902 /**
 903  * irq_dispose_mapping() - Unmap an interrupt
 904  * @virq: linux irq number of the interrupt to unmap
 905  */
 906 void irq_dispose_mapping(unsigned int virq)
 907 {
 908         struct irq_data *irq_data = irq_get_irq_data(virq);
 909         struct irq_domain *domain;
 910
 911         if (!virq || !irq_data)
 912                 return;
 913
 914         domain = irq_data->domain;
 915         if (WARN_ON(domain == NULL))
 916                 return;
 917
 918         if (irq_domain_is_hierarchy(domain)) {
 919                 irq_domain_free_irqs(virq, 1);
 920         } else {
 921                 irq_domain_disassociate(domain, virq);
 922                 irq_free_desc(virq);
 923         }
 924 }
 925 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 926
 927 /**
 928  * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
 929  * @domain: domain owning this hardware interrupt
 930  * @hwirq: hardware irq number in that domain space
 931  * @irq: optional pointer to return the Linux irq if required
 932  *
 933  * Returns the interrupt descriptor.
 934  */
 935 struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
 936                                        irq_hw_number_t hwirq,
 937                                        unsigned int *irq)
 938 {
 939         struct irq_desc *desc = NULL;
 940         struct irq_data *data;
 941
 942         /* Look for default domain if necessary */
 943         if (domain == NULL)
 944                 domain = irq_default_domain;
 945         if (domain == NULL)
 946                 return desc;
 947
 948         if (irq_domain_is_nomap(domain)) {
 949                 if (hwirq < domain->hwirq_max) {
 950                         data = irq_domain_get_irq_data(domain, hwirq);
 951                         if (data && data->hwirq == hwirq)
 952                                 desc = irq_data_to_desc(data);
 953                         if (irq && desc)
 954                                 *irq = hwirq;
 955                 }
 956
 957                 return desc;
 958         }
 959
 960         rcu_read_lock();
 961         /* Check if the hwirq is in the linear revmap. */
 962         if (hwirq < domain->revmap_size)
 963                 data = rcu_dereference(domain->revmap[hwirq]);
 964         else
 965                 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
 966
 967         if (likely(data)) {
 968                 desc = irq_data_to_desc(data);
 969                 if (irq)
 970                         *irq = data->irq;
 971         }
 972
 973         rcu_read_unlock();
 974         return desc;
 975 }
 976 EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
 977
 978 /**
 979  * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
 980  *
 981  * Device Tree IRQ specifier translation function which works with one cell
 982  * bindings where the cell value maps directly to the hwirq number.
 983  */
 984 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
 985                              const u32 *intspec, unsigned int intsize,
 986                              unsigned long *out_hwirq, unsigned int *out_type)
 987 {
 988         if (WARN_ON(intsize < 1))
 989                 return -EINVAL;
 990         *out_hwirq = intspec[0];
 991         *out_type = IRQ_TYPE_NONE;
 992         return 0;
 993 }
 994 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
 995
 996 /**
 997  * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
 998  *
 999  * Device Tree IRQ specifier translation function which works with two cell
1000  * bindings where the cell values map directly to the hwirq number
1001  * and linux irq flags.
1002  */
1003 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1004                         const u32 *intspec, unsigned int intsize,
1005                         irq_hw_number_t *out_hwirq, unsigned int *out_type)
1006 {
1007         struct irq_fwspec fwspec;
1008
1009         of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1010         return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1011 }
1012 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1013
1014 /**
1015  * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1016  *
1017  * Device Tree IRQ specifier translation function which works with either one
1018  * or two cell bindings where the cell values map directly to the hwirq number
1019  * and linux irq flags.
1020  *
1021  * Note: don't use this function unless your interrupt controller explicitly
1022  * supports both one and two cell bindings.  For the majority of controllers
1023  * the _onecell() or _twocell() variants above should be used.
1024  */
1025 int irq_domain_xlate_onetwocell(struct irq_domain *d,
1026                                 struct device_node *ctrlr,
1027                                 const u32 *intspec, unsigned int intsize,
1028                                 unsigned long *out_hwirq, unsigned int *out_type)
1029 {
1030         if (WARN_ON(intsize < 1))
1031                 return -EINVAL;
1032         *out_hwirq = intspec[0];
1033         if (intsize > 1)
1034                 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1035         else
1036                 *out_type = IRQ_TYPE_NONE;
1037         return 0;
1038 }
1039 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1040
1041 const struct irq_domain_ops irq_domain_simple_ops = {
1042         .xlate = irq_domain_xlate_onetwocell,
1043 };
1044 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1045
1046 /**
1047  * irq_domain_translate_onecell() - Generic translate for direct one cell
1048  * bindings
1049  */
1050 int irq_domain_translate_onecell(struct irq_domain *d,
1051                                  struct irq_fwspec *fwspec,
1052                                  unsigned long *out_hwirq,
1053                                  unsigned int *out_type)
1054 {
1055         if (WARN_ON(fwspec->param_count < 1))
1056                 return -EINVAL;
1057         *out_hwirq = fwspec->param[0];
1058         *out_type = IRQ_TYPE_NONE;
1059         return 0;
1060 }
1061 EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1062
1063 /**
1064  * irq_domain_translate_twocell() - Generic translate for direct two cell
1065  * bindings
1066  *
1067  * Device Tree IRQ specifier translation function which works with two cell
1068  * bindings where the cell values map directly to the hwirq number
1069  * and linux irq flags.
1070  */
1071 int irq_domain_translate_twocell(struct irq_domain *d,
1072                                  struct irq_fwspec *fwspec,
1073                                  unsigned long *out_hwirq,
1074                                  unsigned int *out_type)
1075 {
1076         if (WARN_ON(fwspec->param_count < 2))
1077                 return -EINVAL;
1078         *out_hwirq = fwspec->param[0];
1079         *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1080         return 0;
1081 }
1082 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1083
1084 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1085                            int node, const struct irq_affinity_desc *affinity)
1086 {
1087         unsigned int hint;
1088
1089         if (virq >= 0) {
1090                 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1091                                          affinity);
1092         } else {
1093                 hint = hwirq % nr_irqs;
1094                 if (hint == 0)
1095                         hint++;
1096                 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1097                                          affinity);
1098                 if (virq <= 0 && hint > 1) {
1099                         virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1100                                                  affinity);
1101                 }
1102         }
1103
1104         return virq;
1105 }
1106
1107 /**
1108  * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1109  * @irq_data:   The pointer to irq_data
1110  */
1111 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1112 {
1113         irq_data->hwirq = 0;
1114         irq_data->chip = &no_irq_chip;
1115         irq_data->chip_data = NULL;
1116 }
1117 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1118
1119 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1120 /**
1121  * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1122  * @parent:     Parent irq domain to associate with the new domain
1123  * @flags:      Irq domain flags associated to the domain
1124  * @size:       Size of the domain. See below
1125  * @fwnode:     Optional fwnode of the interrupt controller
1126  * @ops:        Pointer to the interrupt domain callbacks
1127  * @host_data:  Controller private data pointer
1128  *
1129  * If @size is 0 a tree domain is created, otherwise a linear domain.
1130  *
1131  * If successful the parent is associated to the new domain and the
1132  * domain flags are set.
1133  * Returns pointer to IRQ domain, or NULL on failure.
1134  */
1135 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1136                                             unsigned int flags,
1137                                             unsigned int size,
1138                                             struct fwnode_handle *fwnode,
1139                                             const struct irq_domain_ops *ops,
1140                                             void *host_data)
1141 {
1142         struct irq_domain *domain;
1143
1144         if (size)
1145                 domain = __irq_domain_create(fwnode, size, size, 0, ops, host_data);
1146         else
1147                 domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
1148
1149         if (domain) {
1150                 if (parent)
1151                         domain->root = parent->root;
1152                 domain->parent = parent;
1153                 domain->flags |= flags;
1154
1155                 __irq_domain_publish(domain);
1156         }
1157
1158         return domain;
1159 }
1160 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1161
1162 static void irq_domain_insert_irq(int virq)
1163 {
1164         struct irq_data *data;
1165
1166         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1167                 struct irq_domain *domain = data->domain;
1168
1169                 domain->mapcount++;
1170                 irq_domain_set_mapping(domain, data->hwirq, data);
1171         }
1172
1173         irq_clear_status_flags(virq, IRQ_NOREQUEST);
1174 }
1175
1176 static void irq_domain_remove_irq(int virq)
1177 {
1178         struct irq_data *data;
1179
1180         irq_set_status_flags(virq, IRQ_NOREQUEST);
1181         irq_set_chip_and_handler(virq, NULL, NULL);
1182         synchronize_irq(virq);
1183         smp_mb();
1184
1185         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1186                 struct irq_domain *domain = data->domain;
1187                 irq_hw_number_t hwirq = data->hwirq;
1188
1189                 domain->mapcount--;
1190                 irq_domain_clear_mapping(domain, hwirq);
1191         }
1192 }
1193
1194 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1195                                                    struct irq_data *child)
1196 {
1197         struct irq_data *irq_data;
1198
1199         irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1200                                 irq_data_get_node(child));
1201         if (irq_data) {
1202                 child->parent_data = irq_data;
1203                 irq_data->irq = child->irq;
1204                 irq_data->common = child->common;
1205                 irq_data->domain = domain;
1206         }
1207
1208         return irq_data;
1209 }
1210
1211 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1212 {
1213         struct irq_data *tmp;
1214
1215         while (irq_data) {
1216                 tmp = irq_data;
1217                 irq_data = irq_data->parent_data;
1218                 kfree(tmp);
1219         }
1220 }
1221
1222 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1223 {
1224         struct irq_data *irq_data, *tmp;
1225         int i;
1226
1227         for (i = 0; i < nr_irqs; i++) {
1228                 irq_data = irq_get_irq_data(virq + i);
1229                 tmp = irq_data->parent_data;
1230                 irq_data->parent_data = NULL;
1231                 irq_data->domain = NULL;
1232
1233                 __irq_domain_free_hierarchy(tmp);
1234         }
1235 }
1236
1237 /**
1238  * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1239  * @domain:     IRQ domain from which the hierarchy is to be disconnected
1240  * @virq:       IRQ number where the hierarchy is to be trimmed
1241  *
1242  * Marks the @virq level belonging to @domain as disconnected.
1243  * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1244  * to @domain.
1245  *
1246  * Its only use is to be able to trim levels of hierarchy that do not
1247  * have any real meaning for this interrupt, and that the driver marks
1248  * as such from its .alloc() callback.
1249  */
1250 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1251                                     unsigned int virq)
1252 {
1253         struct irq_data *irqd;
1254
1255         irqd = irq_domain_get_irq_data(domain, virq);
1256         if (!irqd)
1257                 return -EINVAL;
1258
1259         irqd->chip = ERR_PTR(-ENOTCONN);
1260         return 0;
1261 }
1262 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1263
1264 static int irq_domain_trim_hierarchy(unsigned int virq)
1265 {
1266         struct irq_data *tail, *irqd, *irq_data;
1267
1268         irq_data = irq_get_irq_data(virq);
1269         tail = NULL;
1270
1271         /* The first entry must have a valid irqchip */
1272         if (!irq_data->chip || IS_ERR(irq_data->chip))
1273                 return -EINVAL;
1274
1275         /*
1276          * Validate that the irq_data chain is sane in the presence of
1277          * a hierarchy trimming marker.
1278          */
1279         for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1280                 /* Can't have a valid irqchip after a trim marker */
1281                 if (irqd->chip && tail)
1282                         return -EINVAL;
1283
1284                 /* Can't have an empty irqchip before a trim marker */
1285                 if (!irqd->chip && !tail)
1286                         return -EINVAL;
1287
1288                 if (IS_ERR(irqd->chip)) {
1289                         /* Only -ENOTCONN is a valid trim marker */
1290                         if (PTR_ERR(irqd->chip) != -ENOTCONN)
1291                                 return -EINVAL;
1292
1293                         tail = irq_data;
1294                 }
1295         }
1296
1297         /* No trim marker, nothing to do */
1298         if (!tail)
1299                 return 0;
1300
1301         pr_info("IRQ%d: trimming hierarchy from %s\n",
1302                 virq, tail->parent_data->domain->name);
1303
1304         /* Sever the inner part of the hierarchy...  */
1305         irqd = tail;
1306         tail = tail->parent_data;
1307         irqd->parent_data = NULL;
1308         __irq_domain_free_hierarchy(tail);
1309
1310         return 0;
1311 }
1312
1313 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1314                                      unsigned int virq, unsigned int nr_irqs)
1315 {
1316         struct irq_data *irq_data;
1317         struct irq_domain *parent;
1318         int i;
1319
1320         /* The outermost irq_data is embedded in struct irq_desc */
1321         for (i = 0; i < nr_irqs; i++) {
1322                 irq_data = irq_get_irq_data(virq + i);
1323                 irq_data->domain = domain;
1324
1325                 for (parent = domain->parent; parent; parent = parent->parent) {
1326                         irq_data = irq_domain_insert_irq_data(parent, irq_data);
1327                         if (!irq_data) {
1328                                 irq_domain_free_irq_data(virq, i + 1);
1329                                 return -ENOMEM;
1330                         }
1331                 }
1332         }
1333
1334         return 0;
1335 }
1336
1337 /**
1338  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1339  * @domain:     domain to match
1340  * @virq:       IRQ number to get irq_data
1341  */
1342 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1343                                          unsigned int virq)
1344 {
1345         struct irq_data *irq_data;
1346
1347         for (irq_data = irq_get_irq_data(virq); irq_data;
1348              irq_data = irq_data->parent_data)
1349                 if (irq_data->domain == domain)
1350                         return irq_data;
1351
1352         return NULL;
1353 }
1354 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1355
1356 /**
1357  * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1358  * @domain:     Interrupt domain to match
1359  * @virq:       IRQ number
1360  * @hwirq:      The hwirq number
1361  * @chip:       The associated interrupt chip
1362  * @chip_data:  The associated chip data
1363  */
1364 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1365                                   irq_hw_number_t hwirq,
1366                                   const struct irq_chip *chip,
1367                                   void *chip_data)
1368 {
1369         struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1370
1371         if (!irq_data)
1372                 return -ENOENT;
1373
1374         irq_data->hwirq = hwirq;
1375         irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1376         irq_data->chip_data = chip_data;
1377
1378         return 0;
1379 }
1380 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1381
1382 /**
1383  * irq_domain_set_info - Set the complete data for a @virq in @domain
1384  * @domain:             Interrupt domain to match
1385  * @virq:               IRQ number
1386  * @hwirq:              The hardware interrupt number
1387  * @chip:               The associated interrupt chip
1388  * @chip_data:          The associated interrupt chip data
1389  * @handler:            The interrupt flow handler
1390  * @handler_data:       The interrupt flow handler data
1391  * @handler_name:       The interrupt handler name
1392  */
1393 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1394                          irq_hw_number_t hwirq, const struct irq_chip *chip,
1395                          void *chip_data, irq_flow_handler_t handler,
1396                          void *handler_data, const char *handler_name)
1397 {
1398         irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1399         __irq_set_handler(virq, handler, 0, handler_name);
1400         irq_set_handler_data(virq, handler_data);
1401 }
1402 EXPORT_SYMBOL(irq_domain_set_info);
1403
1404 /**
1405  * irq_domain_free_irqs_common - Clear irq_data and free the parent
1406  * @domain:     Interrupt domain to match
1407  * @virq:       IRQ number to start with
1408  * @nr_irqs:    The number of irqs to free
1409  */
1410 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1411                                  unsigned int nr_irqs)
1412 {
1413         struct irq_data *irq_data;
1414         int i;
1415
1416         for (i = 0; i < nr_irqs; i++) {
1417                 irq_data = irq_domain_get_irq_data(domain, virq + i);
1418                 if (irq_data)
1419                         irq_domain_reset_irq_data(irq_data);
1420         }
1421         irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1422 }
1423 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1424
1425 /**
1426  * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1427  * @domain:     Interrupt domain to match
1428  * @virq:       IRQ number to start with
1429  * @nr_irqs:    The number of irqs to free
1430  */
1431 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1432                               unsigned int nr_irqs)
1433 {
1434         int i;
1435
1436         for (i = 0; i < nr_irqs; i++) {
1437                 irq_set_handler_data(virq + i, NULL);
1438                 irq_set_handler(virq + i, NULL);
1439         }
1440         irq_domain_free_irqs_common(domain, virq, nr_irqs);
1441 }
1442
1443 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1444                                            unsigned int irq_base,
1445                                            unsigned int nr_irqs)
1446 {
1447         unsigned int i;
1448
1449         if (!domain->ops->free)
1450                 return;
1451
1452         for (i = 0; i < nr_irqs; i++) {
1453                 if (irq_domain_get_irq_data(domain, irq_base + i))
1454                         domain->ops->free(domain, irq_base + i, 1);
1455         }
1456 }
1457
1458 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1459                                     unsigned int irq_base,
1460                                     unsigned int nr_irqs, void *arg)
1461 {
1462         if (!domain->ops->alloc) {
1463                 pr_debug("domain->ops->alloc() is NULL\n");
1464                 return -ENOSYS;
1465         }
1466
1467         return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1468 }
1469
1470 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1471                                         unsigned int nr_irqs, int node, void *arg,
1472                                         bool realloc, const struct irq_affinity_desc *affinity)
1473 {
1474         int i, ret, virq;
1475
1476         if (realloc && irq_base >= 0) {
1477                 virq = irq_base;
1478         } else {
1479                 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1480                                               affinity);
1481                 if (virq < 0) {
1482                         pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1483                                  irq_base, nr_irqs);
1484                         return virq;
1485                 }
1486         }
1487
1488         if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1489                 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1490                 ret = -ENOMEM;
1491                 goto out_free_desc;
1492         }
1493
1494         ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1495         if (ret < 0)
1496                 goto out_free_irq_data;
1497
1498         for (i = 0; i < nr_irqs; i++) {
1499                 ret = irq_domain_trim_hierarchy(virq + i);
1500                 if (ret)
1501                         goto out_free_irq_data;
1502         }
1503
1504         for (i = 0; i < nr_irqs; i++)
1505                 irq_domain_insert_irq(virq + i);
1506
1507         return virq;
1508
1509 out_free_irq_data:
1510         irq_domain_free_irq_data(virq, nr_irqs);
1511 out_free_desc:
1512         irq_free_descs(virq, nr_irqs);
1513         return ret;
1514 }
1515
1516 /**
1517  * __irq_domain_alloc_irqs - Allocate IRQs from domain
1518  * @domain:     domain to allocate from
1519  * @irq_base:   allocate specified IRQ number if irq_base >= 0
1520  * @nr_irqs:    number of IRQs to allocate
1521  * @node:       NUMA node id for memory allocation
1522  * @arg:        domain specific argument
1523  * @realloc:    IRQ descriptors have already been allocated if true
1524  * @affinity:   Optional irq affinity mask for multiqueue devices
1525  *
1526  * Allocate IRQ numbers and initialized all data structures to support
1527  * hierarchy IRQ domains.
1528  * Parameter @realloc is mainly to support legacy IRQs.
1529  * Returns error code or allocated IRQ number
1530  *
1531  * The whole process to setup an IRQ has been split into two steps.
1532  * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1533  * descriptor and required hardware resources. The second step,
1534  * irq_domain_activate_irq(), is to program the hardware with preallocated
1535  * resources. In this way, it's easier to rollback when failing to
1536  * allocate resources.
1537  */
1538 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1539                             unsigned int nr_irqs, int node, void *arg,
1540                             bool realloc, const struct irq_affinity_desc *affinity)
1541 {
1542         int ret;
1543
1544         if (domain == NULL) {
1545                 domain = irq_default_domain;
1546                 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1547                         return -EINVAL;
1548         }
1549
1550         mutex_lock(&domain->root->mutex);
1551         ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1552                                            realloc, affinity);
1553         mutex_unlock(&domain->root->mutex);
1554
1555         return ret;
1556 }
1557 EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1558
1559 /* The irq_data was moved, fix the revmap to refer to the new location */
1560 static void irq_domain_fix_revmap(struct irq_data *d)
1561 {
1562         void __rcu **slot;
1563
1564         lockdep_assert_held(&d->domain->root->mutex);
1565
1566         if (irq_domain_is_nomap(d->domain))
1567                 return;
1568
1569         /* Fix up the revmap. */
1570         if (d->hwirq < d->domain->revmap_size) {
1571                 /* Not using radix tree */
1572                 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1573         } else {
1574                 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1575                 if (slot)
1576                         radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1577         }
1578 }
1579
1580 /**
1581  * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1582  * @domain:     Domain to push.
1583  * @virq:       Irq to push the domain in to.
1584  * @arg:        Passed to the irq_domain_ops alloc() function.
1585  *
1586  * For an already existing irqdomain hierarchy, as might be obtained
1587  * via a call to pci_enable_msix(), add an additional domain to the
1588  * head of the processing chain.  Must be called before request_irq()
1589  * has been called.
1590  */
1591 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1592 {
1593         struct irq_data *irq_data = irq_get_irq_data(virq);
1594         struct irq_data *parent_irq_data;
1595         struct irq_desc *desc;
1596         int rv = 0;
1597
1598         /*
1599          * Check that no action has been set, which indicates the virq
1600          * is in a state where this function doesn't have to deal with
1601          * races between interrupt handling and maintaining the
1602          * hierarchy.  This will catch gross misuse.  Attempting to
1603          * make the check race free would require holding locks across
1604          * calls to struct irq_domain_ops->alloc(), which could lead
1605          * to deadlock, so we just do a simple check before starting.
1606          */
1607         desc = irq_to_desc(virq);
1608         if (!desc)
1609                 return -EINVAL;
1610         if (WARN_ON(desc->action))
1611                 return -EBUSY;
1612
1613         if (domain == NULL)
1614                 return -EINVAL;
1615
1616         if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1617                 return -EINVAL;
1618
1619         if (!irq_data)
1620                 return -EINVAL;
1621
1622         if (domain->parent != irq_data->domain)
1623                 return -EINVAL;
1624
1625         parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1626                                        irq_data_get_node(irq_data));
1627         if (!parent_irq_data)
1628                 return -ENOMEM;
1629
1630         mutex_lock(&domain->root->mutex);
1631
1632         /* Copy the original irq_data. */
1633         *parent_irq_data = *irq_data;
1634
1635         /*
1636          * Overwrite the irq_data, which is embedded in struct irq_desc, with
1637          * values for this domain.
1638          */
1639         irq_data->parent_data = parent_irq_data;
1640         irq_data->domain = domain;
1641         irq_data->mask = 0;
1642         irq_data->hwirq = 0;
1643         irq_data->chip = NULL;
1644         irq_data->chip_data = NULL;
1645
1646         /* May (probably does) set hwirq, chip, etc. */
1647         rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1648         if (rv) {
1649                 /* Restore the original irq_data. */
1650                 *irq_data = *parent_irq_data;
1651                 kfree(parent_irq_data);
1652                 goto error;
1653         }
1654
1655         irq_domain_fix_revmap(parent_irq_data);
1656         irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
1657 error:
1658         mutex_unlock(&domain->root->mutex);
1659
1660         return rv;
1661 }
1662 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1663
1664 /**
1665  * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1666  * @domain:     Domain to remove.
1667  * @virq:       Irq to remove the domain from.
1668  *
1669  * Undo the effects of a call to irq_domain_push_irq().  Must be
1670  * called either before request_irq() or after free_irq().
1671  */
1672 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1673 {
1674         struct irq_data *irq_data = irq_get_irq_data(virq);
1675         struct irq_data *parent_irq_data;
1676         struct irq_data *tmp_irq_data;
1677         struct irq_desc *desc;
1678
1679         /*
1680          * Check that no action is set, which indicates the virq is in
1681          * a state where this function doesn't have to deal with races
1682          * between interrupt handling and maintaining the hierarchy.
1683          * This will catch gross misuse.  Attempting to make the check
1684          * race free would require holding locks across calls to
1685          * struct irq_domain_ops->free(), which could lead to
1686          * deadlock, so we just do a simple check before starting.
1687          */
1688         desc = irq_to_desc(virq);
1689         if (!desc)
1690                 return -EINVAL;
1691         if (WARN_ON(desc->action))
1692                 return -EBUSY;
1693
1694         if (domain == NULL)
1695                 return -EINVAL;
1696
1697         if (!irq_data)
1698                 return -EINVAL;
1699
1700         tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1701
1702         /* We can only "pop" if this domain is at the top of the list */
1703         if (WARN_ON(irq_data != tmp_irq_data))
1704                 return -EINVAL;
1705
1706         if (WARN_ON(irq_data->domain != domain))
1707                 return -EINVAL;
1708
1709         parent_irq_data = irq_data->parent_data;
1710         if (WARN_ON(!parent_irq_data))
1711                 return -EINVAL;
1712
1713         mutex_lock(&domain->root->mutex);
1714
1715         irq_data->parent_data = NULL;
1716
1717         irq_domain_clear_mapping(domain, irq_data->hwirq);
1718         irq_domain_free_irqs_hierarchy(domain, virq, 1);
1719
1720         /* Restore the original irq_data. */
1721         *irq_data = *parent_irq_data;
1722
1723         irq_domain_fix_revmap(irq_data);
1724
1725         mutex_unlock(&domain->root->mutex);
1726
1727         kfree(parent_irq_data);
1728
1729         return 0;
1730 }
1731 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1732
1733 /**
1734  * irq_domain_free_irqs - Free IRQ number and associated data structures
1735  * @virq:       base IRQ number
1736  * @nr_irqs:    number of IRQs to free
1737  */
1738 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1739 {
1740         struct irq_data *data = irq_get_irq_data(virq);
1741         struct irq_domain *domain;
1742         int i;
1743
1744         if (WARN(!data || !data->domain || !data->domain->ops->free,
1745                  "NULL pointer, cannot free irq\n"))
1746                 return;
1747
1748         domain = data->domain;
1749
1750         mutex_lock(&domain->root->mutex);
1751         for (i = 0; i < nr_irqs; i++)
1752                 irq_domain_remove_irq(virq + i);
1753         irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
1754         mutex_unlock(&domain->root->mutex);
1755
1756         irq_domain_free_irq_data(virq, nr_irqs);
1757         irq_free_descs(virq, nr_irqs);
1758 }
1759
1760 /**
1761  * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1762  * @domain:     Domain below which interrupts must be allocated
1763  * @irq_base:   Base IRQ number
1764  * @nr_irqs:    Number of IRQs to allocate
1765  * @arg:        Allocation data (arch/domain specific)
1766  */
1767 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1768                                  unsigned int irq_base, unsigned int nr_irqs,
1769                                  void *arg)
1770 {
1771         if (!domain->parent)
1772                 return -ENOSYS;
1773
1774         return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1775                                                nr_irqs, arg);
1776 }
1777 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1778
1779 /**
1780  * irq_domain_free_irqs_parent - Free interrupts from parent domain
1781  * @domain:     Domain below which interrupts must be freed
1782  * @irq_base:   Base IRQ number
1783  * @nr_irqs:    Number of IRQs to free
1784  */
1785 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1786                                  unsigned int irq_base, unsigned int nr_irqs)
1787 {
1788         if (!domain->parent)
1789                 return;
1790
1791         irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1792 }
1793 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1794
1795 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1796 {
1797         if (irq_data && irq_data->domain) {
1798                 struct irq_domain *domain = irq_data->domain;
1799
1800                 if (domain->ops->deactivate)
1801                         domain->ops->deactivate(domain, irq_data);
1802                 if (irq_data->parent_data)
1803                         __irq_domain_deactivate_irq(irq_data->parent_data);
1804         }
1805 }
1806
1807 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1808 {
1809         int ret = 0;
1810
1811         if (irqd && irqd->domain) {
1812                 struct irq_domain *domain = irqd->domain;
1813
1814                 if (irqd->parent_data)
1815                         ret = __irq_domain_activate_irq(irqd->parent_data,
1816                                                         reserve);
1817                 if (!ret && domain->ops->activate) {
1818                         ret = domain->ops->activate(domain, irqd, reserve);
1819                         /* Rollback in case of error */
1820                         if (ret && irqd->parent_data)
1821                                 __irq_domain_deactivate_irq(irqd->parent_data);
1822                 }
1823         }
1824         return ret;
1825 }
1826
1827 /**
1828  * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1829  *                           interrupt
1830  * @irq_data:   Outermost irq_data associated with interrupt
1831  * @reserve:    If set only reserve an interrupt vector instead of assigning one
1832  *
1833  * This is the second step to call domain_ops->activate to program interrupt
1834  * controllers, so the interrupt could actually get delivered.
1835  */
1836 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1837 {
1838         int ret = 0;
1839
1840         if (!irqd_is_activated(irq_data))
1841                 ret = __irq_domain_activate_irq(irq_data, reserve);
1842         if (!ret)
1843                 irqd_set_activated(irq_data);
1844         return ret;
1845 }
1846
1847 /**
1848  * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1849  *                             deactivate interrupt
1850  * @irq_data: outermost irq_data associated with interrupt
1851  *
1852  * It calls domain_ops->deactivate to program interrupt controllers to disable
1853  * interrupt delivery.
1854  */
1855 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1856 {
1857         if (irqd_is_activated(irq_data)) {
1858                 __irq_domain_deactivate_irq(irq_data);
1859                 irqd_clr_activated(irq_data);
1860         }
1861 }
1862
1863 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1864 {
1865         /* Hierarchy irq_domains must implement callback alloc() */
1866         if (domain->ops->alloc)
1867                 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1868 }
1869 #else   /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1870 /**
1871  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1872  * @domain:     domain to match
1873  * @virq:       IRQ number to get irq_data
1874  */
1875 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1876                                          unsigned int virq)
1877 {
1878         struct irq_data *irq_data = irq_get_irq_data(virq);
1879
1880         return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1881 }
1882 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1883
1884 /**
1885  * irq_domain_set_info - Set the complete data for a @virq in @domain
1886  * @domain:             Interrupt domain to match
1887  * @virq:               IRQ number
1888  * @hwirq:              The hardware interrupt number
1889  * @chip:               The associated interrupt chip
1890  * @chip_data:          The associated interrupt chip data
1891  * @handler:            The interrupt flow handler
1892  * @handler_data:       The interrupt flow handler data
1893  * @handler_name:       The interrupt handler name
1894  */
1895 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1896                          irq_hw_number_t hwirq, const struct irq_chip *chip,
1897                          void *chip_data, irq_flow_handler_t handler,
1898                          void *handler_data, const char *handler_name)
1899 {
1900         irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1901         irq_set_chip_data(virq, chip_data);
1902         irq_set_handler_data(virq, handler_data);
1903 }
1904
1905 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1906                                         unsigned int nr_irqs, int node, void *arg,
1907                                         bool realloc, const struct irq_affinity_desc *affinity)
1908 {
1909         return -EINVAL;
1910 }
1911
1912 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1913 {
1914 }
1915 #endif  /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1916
1917 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1918 static struct dentry *domain_dir;
1919
1920 static void
1921 irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1922 {
1923         seq_printf(m, "%*sname:   %s\n", ind, "", d->name);
1924         seq_printf(m, "%*ssize:   %u\n", ind + 1, "", d->revmap_size);
1925         seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1926         seq_printf(m, "%*sflags:  0x%08x\n", ind +1 , "", d->flags);
1927         if (d->ops && d->ops->debug_show)
1928                 d->ops->debug_show(m, d, NULL, ind + 1);
1929 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1930         if (!d->parent)
1931                 return;
1932         seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1933         irq_domain_debug_show_one(m, d->parent, ind + 4);
1934 #endif
1935 }
1936
1937 static int irq_domain_debug_show(struct seq_file *m, void *p)
1938 {
1939         struct irq_domain *d = m->private;
1940
1941         /* Default domain? Might be NULL */
1942         if (!d) {
1943                 if (!irq_default_domain)
1944                         return 0;
1945                 d = irq_default_domain;
1946         }
1947         irq_domain_debug_show_one(m, d, 0);
1948         return 0;
1949 }
1950 DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1951
1952 static void debugfs_add_domain_dir(struct irq_domain *d)
1953 {
1954         if (!d->name || !domain_dir)
1955                 return;
1956         debugfs_create_file(d->name, 0444, domain_dir, d,
1957                             &irq_domain_debug_fops);
1958 }
1959
1960 static void debugfs_remove_domain_dir(struct irq_domain *d)
1961 {
1962         debugfs_lookup_and_remove(d->name, domain_dir);
1963 }
1964
1965 void __init irq_domain_debugfs_init(struct dentry *root)
1966 {
1967         struct irq_domain *d;
1968
1969         domain_dir = debugfs_create_dir("domains", root);
1970
1971         debugfs_create_file("default", 0444, domain_dir, NULL,
1972                             &irq_domain_debug_fops);
1973         mutex_lock(&irq_domain_mutex);
1974         list_for_each_entry(d, &irq_domain_list, link)
1975                 debugfs_add_domain_dir(d);
1976         mutex_unlock(&irq_domain_mutex);
1977 }
1978 #endif