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 (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                 return NULL;
 144
 145         domain = kzalloc_node(struct_size(domain, revmap, size),
 146                               GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
 147         if (!domain)
 148                 return NULL;
 149
 150         if (is_fwnode_irqchip(fwnode)) {
 151                 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
 152
 153                 switch (fwid->type) {
 154                 case IRQCHIP_FWNODE_NAMED:
 155                 case IRQCHIP_FWNODE_NAMED_ID:
 156                         domain->fwnode = fwnode;
 157                         domain->name = kstrdup(fwid->name, GFP_KERNEL);
 158                         if (!domain->name) {
 159                                 kfree(domain);
 160                                 return NULL;
 161                         }
 162                         domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 163                         break;
 164                 default:
 165                         domain->fwnode = fwnode;
 166                         domain->name = fwid->name;
 167                         break;
 168                 }
 169         } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
 170                    is_software_node(fwnode)) {
 171                 char *name;
 172
 173                 /*
 174                  * fwnode paths contain '/', which debugfs is legitimately
 175                  * unhappy about. Replace them with ':', which does
 176                  * the trick and is not as offensive as '\'...
 177                  */
 178                 name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
 179                 if (!name) {
 180                         kfree(domain);
 181                         return NULL;
 182                 }
 183
 184                 strreplace(name, '/', ':');
 185
 186                 domain->name = name;
 187                 domain->fwnode = fwnode;
 188                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 189         }
 190
 191         if (!domain->name) {
 192                 if (fwnode)
 193                         pr_err("Invalid fwnode type for irqdomain\n");
 194                 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
 195                                          atomic_inc_return(&unknown_domains));
 196                 if (!domain->name) {
 197                         kfree(domain);
 198                         return NULL;
 199                 }
 200                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 201         }
 202
 203         fwnode_handle_get(fwnode);
 204         fwnode_dev_initialized(fwnode, true);
 205
 206         /* Fill structure */
 207         INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
 208         mutex_init(&domain->revmap_mutex);
 209         domain->ops = ops;
 210         domain->host_data = host_data;
 211         domain->hwirq_max = hwirq_max;
 212
 213         if (direct_max) {
 214                 size = direct_max;
 215                 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
 216         }
 217
 218         domain->revmap_size = size;
 219
 220         irq_domain_check_hierarchy(domain);
 221
 222         return domain;
 223 }
 224
 225 static void __irq_domain_publish(struct irq_domain *domain)
 226 {
 227         mutex_lock(&irq_domain_mutex);
 228         debugfs_add_domain_dir(domain);
 229         list_add(&domain->link, &irq_domain_list);
 230         mutex_unlock(&irq_domain_mutex);
 231
 232         pr_debug("Added domain %s\n", domain->name);
 233 }
 234
 235 /**
 236  * __irq_domain_add() - Allocate a new irq_domain data structure
 237  * @fwnode: firmware node for the interrupt controller
 238  * @size: Size of linear map; 0 for radix mapping only
 239  * @hwirq_max: Maximum number of interrupts supported by controller
 240  * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
 241  *              direct mapping
 242  * @ops: domain callbacks
 243  * @host_data: Controller private data pointer
 244  *
 245  * Allocates and initializes an irq_domain structure.
 246  * Returns pointer to IRQ domain, or NULL on failure.
 247  */
 248 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
 249                                     irq_hw_number_t hwirq_max, int direct_max,
 250                                     const struct irq_domain_ops *ops,
 251                                     void *host_data)
 252 {
 253         struct irq_domain *domain;
 254
 255         domain = __irq_domain_create(fwnode, size, hwirq_max, direct_max,
 256                                      ops, host_data);
 257         if (domain)
 258                 __irq_domain_publish(domain);
 259
 260         return domain;
 261 }
 262 EXPORT_SYMBOL_GPL(__irq_domain_add);
 263
 264 /**
 265  * irq_domain_remove() - Remove an irq domain.
 266  * @domain: domain to remove
 267  *
 268  * This routine is used to remove an irq domain. The caller must ensure
 269  * that all mappings within the domain have been disposed of prior to
 270  * use, depending on the revmap type.
 271  */
 272 void irq_domain_remove(struct irq_domain *domain)
 273 {
 274         mutex_lock(&irq_domain_mutex);
 275         debugfs_remove_domain_dir(domain);
 276
 277         WARN_ON(!radix_tree_empty(&domain->revmap_tree));
 278
 279         list_del(&domain->link);
 280
 281         /*
 282          * If the going away domain is the default one, reset it.
 283          */
 284         if (unlikely(irq_default_domain == domain))
 285                 irq_set_default_host(NULL);
 286
 287         mutex_unlock(&irq_domain_mutex);
 288
 289         pr_debug("Removed domain %s\n", domain->name);
 290
 291         fwnode_dev_initialized(domain->fwnode, false);
 292         fwnode_handle_put(domain->fwnode);
 293         if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
 294                 kfree(domain->name);
 295         kfree(domain);
 296 }
 297 EXPORT_SYMBOL_GPL(irq_domain_remove);
 298
 299 void irq_domain_update_bus_token(struct irq_domain *domain,
 300                                  enum irq_domain_bus_token bus_token)
 301 {
 302         char *name;
 303
 304         if (domain->bus_token == bus_token)
 305                 return;
 306
 307         mutex_lock(&irq_domain_mutex);
 308
 309         domain->bus_token = bus_token;
 310
 311         name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
 312         if (!name) {
 313                 mutex_unlock(&irq_domain_mutex);
 314                 return;
 315         }
 316
 317         debugfs_remove_domain_dir(domain);
 318
 319         if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
 320                 kfree(domain->name);
 321         else
 322                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 323
 324         domain->name = name;
 325         debugfs_add_domain_dir(domain);
 326
 327         mutex_unlock(&irq_domain_mutex);
 328 }
 329 EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
 330
 331 /**
 332  * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
 333  * @fwnode: firmware node for the interrupt controller
 334  * @size: total number of irqs in mapping
 335  * @first_irq: first number of irq block assigned to the domain,
 336  *      pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
 337  *      pre-map all of the irqs in the domain to virqs starting at first_irq.
 338  * @ops: domain callbacks
 339  * @host_data: Controller private data pointer
 340  *
 341  * Allocates an irq_domain, and optionally if first_irq is positive then also
 342  * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
 343  *
 344  * This is intended to implement the expected behaviour for most
 345  * interrupt controllers. If device tree is used, then first_irq will be 0 and
 346  * irqs get mapped dynamically on the fly. However, if the controller requires
 347  * static virq assignments (non-DT boot) then it will set that up correctly.
 348  */
 349 struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
 350                                             unsigned int size,
 351                                             unsigned int first_irq,
 352                                             const struct irq_domain_ops *ops,
 353                                             void *host_data)
 354 {
 355         struct irq_domain *domain;
 356
 357         domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data);
 358         if (!domain)
 359                 return NULL;
 360
 361         if (first_irq > 0) {
 362                 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
 363                         /* attempt to allocated irq_descs */
 364                         int rc = irq_alloc_descs(first_irq, first_irq, size,
 365                                                  of_node_to_nid(to_of_node(fwnode)));
 366                         if (rc < 0)
 367                                 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
 368                                         first_irq);
 369                 }
 370                 irq_domain_associate_many(domain, first_irq, 0, size);
 371         }
 372
 373         return domain;
 374 }
 375 EXPORT_SYMBOL_GPL(irq_domain_create_simple);
 376
 377 /**
 378  * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
 379  * @of_node: pointer to interrupt controller's device tree node.
 380  * @size: total number of irqs in legacy mapping
 381  * @first_irq: first number of irq block assigned to the domain
 382  * @first_hwirq: first hwirq number to use for the translation. Should normally
 383  *               be '0', but a positive integer can be used if the effective
 384  *               hwirqs numbering does not begin at zero.
 385  * @ops: map/unmap domain callbacks
 386  * @host_data: Controller private data pointer
 387  *
 388  * Note: the map() callback will be called before this function returns
 389  * for all legacy interrupts except 0 (which is always the invalid irq for
 390  * a legacy controller).
 391  */
 392 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 393                                          unsigned int size,
 394                                          unsigned int first_irq,
 395                                          irq_hw_number_t first_hwirq,
 396                                          const struct irq_domain_ops *ops,
 397                                          void *host_data)
 398 {
 399         return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
 400                                         first_irq, first_hwirq, ops, host_data);
 401 }
 402 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 403
 404 struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
 405                                          unsigned int size,
 406                                          unsigned int first_irq,
 407                                          irq_hw_number_t first_hwirq,
 408                                          const struct irq_domain_ops *ops,
 409                                          void *host_data)
 410 {
 411         struct irq_domain *domain;
 412
 413         domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
 414         if (domain)
 415                 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
 416
 417         return domain;
 418 }
 419 EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
 420
 421 /**
 422  * irq_find_matching_fwspec() - Locates a domain for a given fwspec
 423  * @fwspec: FW specifier for an interrupt
 424  * @bus_token: domain-specific data
 425  */
 426 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
 427                                             enum irq_domain_bus_token bus_token)
 428 {
 429         struct irq_domain *h, *found = NULL;
 430         struct fwnode_handle *fwnode = fwspec->fwnode;
 431         int rc;
 432
 433         /* We might want to match the legacy controller last since
 434          * it might potentially be set to match all interrupts in
 435          * the absence of a device node. This isn't a problem so far
 436          * yet though...
 437          *
 438          * bus_token == DOMAIN_BUS_ANY matches any domain, any other
 439          * values must generate an exact match for the domain to be
 440          * selected.
 441          */
 442         mutex_lock(&irq_domain_mutex);
 443         list_for_each_entry(h, &irq_domain_list, link) {
 444                 if (h->ops->select && fwspec->param_count)
 445                         rc = h->ops->select(h, fwspec, bus_token);
 446                 else if (h->ops->match)
 447                         rc = h->ops->match(h, to_of_node(fwnode), bus_token);
 448                 else
 449                         rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
 450                               ((bus_token == DOMAIN_BUS_ANY) ||
 451                                (h->bus_token == bus_token)));
 452
 453                 if (rc) {
 454                         found = h;
 455                         break;
 456                 }
 457         }
 458         mutex_unlock(&irq_domain_mutex);
 459         return found;
 460 }
 461 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
 462
 463 /**
 464  * irq_domain_check_msi_remap - Check whether all MSI irq domains implement
 465  * IRQ remapping
 466  *
 467  * Return: false if any MSI irq domain does not support IRQ remapping,
 468  * true otherwise (including if there is no MSI irq domain)
 469  */
 470 bool irq_domain_check_msi_remap(void)
 471 {
 472         struct irq_domain *h;
 473         bool ret = true;
 474
 475         mutex_lock(&irq_domain_mutex);
 476         list_for_each_entry(h, &irq_domain_list, link) {
 477                 if (irq_domain_is_msi(h) &&
 478                     !irq_domain_hierarchical_is_msi_remap(h)) {
 479                         ret = false;
 480                         break;
 481                 }
 482         }
 483         mutex_unlock(&irq_domain_mutex);
 484         return ret;
 485 }
 486 EXPORT_SYMBOL_GPL(irq_domain_check_msi_remap);
 487
 488 /**
 489  * irq_set_default_host() - Set a "default" irq domain
 490  * @domain: default domain pointer
 491  *
 492  * For convenience, it's possible to set a "default" domain that will be used
 493  * whenever NULL is passed to irq_create_mapping(). It makes life easier for
 494  * platforms that want to manipulate a few hard coded interrupt numbers that
 495  * aren't properly represented in the device-tree.
 496  */
 497 void irq_set_default_host(struct irq_domain *domain)
 498 {
 499         pr_debug("Default domain set to @0x%p\n", domain);
 500
 501         irq_default_domain = domain;
 502 }
 503 EXPORT_SYMBOL_GPL(irq_set_default_host);
 504
 505 /**
 506  * irq_get_default_host() - Retrieve the "default" irq domain
 507  *
 508  * Returns: the default domain, if any.
 509  *
 510  * Modern code should never use this. This should only be used on
 511  * systems that cannot implement a firmware->fwnode mapping (which
 512  * both DT and ACPI provide).
 513  */
 514 struct irq_domain *irq_get_default_host(void)
 515 {
 516         return irq_default_domain;
 517 }
 518 EXPORT_SYMBOL_GPL(irq_get_default_host);
 519
 520 static bool irq_domain_is_nomap(struct irq_domain *domain)
 521 {
 522         return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
 523                (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
 524 }
 525
 526 static void irq_domain_clear_mapping(struct irq_domain *domain,
 527                                      irq_hw_number_t hwirq)
 528 {
 529         if (irq_domain_is_nomap(domain))
 530                 return;
 531
 532         mutex_lock(&domain->revmap_mutex);
 533         if (hwirq < domain->revmap_size)
 534                 rcu_assign_pointer(domain->revmap[hwirq], NULL);
 535         else
 536                 radix_tree_delete(&domain->revmap_tree, hwirq);
 537         mutex_unlock(&domain->revmap_mutex);
 538 }
 539
 540 static void irq_domain_set_mapping(struct irq_domain *domain,
 541                                    irq_hw_number_t hwirq,
 542                                    struct irq_data *irq_data)
 543 {
 544         if (irq_domain_is_nomap(domain))
 545                 return;
 546
 547         mutex_lock(&domain->revmap_mutex);
 548         if (hwirq < domain->revmap_size)
 549                 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
 550         else
 551                 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
 552         mutex_unlock(&domain->revmap_mutex);
 553 }
 554
 555 static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
 556 {
 557         struct irq_data *irq_data = irq_get_irq_data(irq);
 558         irq_hw_number_t hwirq;
 559
 560         if (WARN(!irq_data || irq_data->domain != domain,
 561                  "virq%i doesn't exist; cannot disassociate\n", irq))
 562                 return;
 563
 564         hwirq = irq_data->hwirq;
 565
 566         mutex_lock(&irq_domain_mutex);
 567
 568         irq_set_status_flags(irq, IRQ_NOREQUEST);
 569
 570         /* remove chip and handler */
 571         irq_set_chip_and_handler(irq, NULL, NULL);
 572
 573         /* Make sure it's completed */
 574         synchronize_irq(irq);
 575
 576         /* Tell the PIC about it */
 577         if (domain->ops->unmap)
 578                 domain->ops->unmap(domain, irq);
 579         smp_mb();
 580
 581         irq_data->domain = NULL;
 582         irq_data->hwirq = 0;
 583         domain->mapcount--;
 584
 585         /* Clear reverse map for this hwirq */
 586         irq_domain_clear_mapping(domain, hwirq);
 587
 588         mutex_unlock(&irq_domain_mutex);
 589 }
 590
 591 static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
 592                                        irq_hw_number_t hwirq)
 593 {
 594         struct irq_data *irq_data = irq_get_irq_data(virq);
 595         int ret;
 596
 597         if (WARN(hwirq >= domain->hwirq_max,
 598                  "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
 599                 return -EINVAL;
 600         if (WARN(!irq_data, "error: virq%i is not allocated", virq))
 601                 return -EINVAL;
 602         if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
 603                 return -EINVAL;
 604
 605         irq_data->hwirq = hwirq;
 606         irq_data->domain = domain;
 607         if (domain->ops->map) {
 608                 ret = domain->ops->map(domain, virq, hwirq);
 609                 if (ret != 0) {
 610                         /*
 611                          * If map() returns -EPERM, this interrupt is protected
 612                          * by the firmware or some other service and shall not
 613                          * be mapped. Don't bother telling the user about it.
 614                          */
 615                         if (ret != -EPERM) {
 616                                 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
 617                                        domain->name, hwirq, virq, ret);
 618                         }
 619                         irq_data->domain = NULL;
 620                         irq_data->hwirq = 0;
 621                         return ret;
 622                 }
 623
 624                 /* If not already assigned, give the domain the chip's name */
 625                 if (!domain->name && irq_data->chip)
 626                         domain->name = irq_data->chip->name;
 627         }
 628
 629         domain->mapcount++;
 630         irq_domain_set_mapping(domain, hwirq, irq_data);
 631
 632         irq_clear_status_flags(virq, IRQ_NOREQUEST);
 633
 634         return 0;
 635 }
 636
 637 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
 638                          irq_hw_number_t hwirq)
 639 {
 640         int ret;
 641
 642         mutex_lock(&irq_domain_mutex);
 643         ret = irq_domain_associate_locked(domain, virq, hwirq);
 644         mutex_unlock(&irq_domain_mutex);
 645
 646         return ret;
 647 }
 648 EXPORT_SYMBOL_GPL(irq_domain_associate);
 649
 650 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 651                                irq_hw_number_t hwirq_base, int count)
 652 {
 653         struct device_node *of_node;
 654         int i;
 655
 656         of_node = irq_domain_get_of_node(domain);
 657         pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
 658                 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
 659
 660         for (i = 0; i < count; i++) {
 661                 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
 662         }
 663 }
 664 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
 665
 666 #ifdef CONFIG_IRQ_DOMAIN_NOMAP
 667 /**
 668  * irq_create_direct_mapping() - Allocate an irq for direct mapping
 669  * @domain: domain to allocate the irq for or NULL for default domain
 670  *
 671  * This routine is used for irq controllers which can choose the hardware
 672  * interrupt numbers they generate. In such a case it's simplest to use
 673  * the linux irq as the hardware interrupt number. It still uses the linear
 674  * or radix tree to store the mapping, but the irq controller can optimize
 675  * the revmap path by using the hwirq directly.
 676  */
 677 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 678 {
 679         struct device_node *of_node;
 680         unsigned int virq;
 681
 682         if (domain == NULL)
 683                 domain = irq_default_domain;
 684
 685         of_node = irq_domain_get_of_node(domain);
 686         virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
 687         if (!virq) {
 688                 pr_debug("create_direct virq allocation failed\n");
 689                 return 0;
 690         }
 691         if (virq >= domain->revmap_size) {
 692                 pr_err("ERROR: no free irqs available below %i maximum\n",
 693                         domain->revmap_size);
 694                 irq_free_desc(virq);
 695                 return 0;
 696         }
 697         pr_debug("create_direct obtained virq %d\n", virq);
 698
 699         if (irq_domain_associate(domain, virq, virq)) {
 700                 irq_free_desc(virq);
 701                 return 0;
 702         }
 703
 704         return virq;
 705 }
 706 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
 707 #endif
 708
 709 static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
 710                                                        irq_hw_number_t hwirq,
 711                                                        const struct irq_affinity_desc *affinity)
 712 {
 713         struct device_node *of_node = irq_domain_get_of_node(domain);
 714         int virq;
 715
 716         pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
 717
 718         /* Allocate a virtual interrupt number */
 719         virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
 720                                       affinity);
 721         if (virq <= 0) {
 722                 pr_debug("-> virq allocation failed\n");
 723                 return 0;
 724         }
 725
 726         if (irq_domain_associate_locked(domain, virq, hwirq)) {
 727                 irq_free_desc(virq);
 728                 return 0;
 729         }
 730
 731         pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
 732                 hwirq, of_node_full_name(of_node), virq);
 733
 734         return virq;
 735 }
 736
 737 /**
 738  * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
 739  * @domain: domain owning this hardware interrupt or NULL for default domain
 740  * @hwirq: hardware irq number in that domain space
 741  * @affinity: irq affinity
 742  *
 743  * Only one mapping per hardware interrupt is permitted. Returns a linux
 744  * irq number.
 745  * If the sense/trigger is to be specified, set_irq_type() should be called
 746  * on the number returned from that call.
 747  */
 748 unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
 749                                          irq_hw_number_t hwirq,
 750                                          const struct irq_affinity_desc *affinity)
 751 {
 752         int virq;
 753
 754         /* Look for default domain if necessary */
 755         if (domain == NULL)
 756                 domain = irq_default_domain;
 757         if (domain == NULL) {
 758                 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
 759                 return 0;
 760         }
 761
 762         mutex_lock(&irq_domain_mutex);
 763
 764         /* Check if mapping already exists */
 765         virq = irq_find_mapping(domain, hwirq);
 766         if (virq) {
 767                 pr_debug("existing mapping on virq %d\n", virq);
 768                 goto out;
 769         }
 770
 771         virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
 772 out:
 773         mutex_unlock(&irq_domain_mutex);
 774
 775         return virq;
 776 }
 777 EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
 778
 779 static int irq_domain_translate(struct irq_domain *d,
 780                                 struct irq_fwspec *fwspec,
 781                                 irq_hw_number_t *hwirq, unsigned int *type)
 782 {
 783 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 784         if (d->ops->translate)
 785                 return d->ops->translate(d, fwspec, hwirq, type);
 786 #endif
 787         if (d->ops->xlate)
 788                 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
 789                                      fwspec->param, fwspec->param_count,
 790                                      hwirq, type);
 791
 792         /* If domain has no translation, then we assume interrupt line */
 793         *hwirq = fwspec->param[0];
 794         return 0;
 795 }
 796
 797 static void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
 798                                       unsigned int count,
 799                                       struct irq_fwspec *fwspec)
 800 {
 801         int i;
 802
 803         fwspec->fwnode = of_node_to_fwnode(np);
 804         fwspec->param_count = count;
 805
 806         for (i = 0; i < count; i++)
 807                 fwspec->param[i] = args[i];
 808 }
 809
 810 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
 811 {
 812         struct irq_domain *domain;
 813         struct irq_data *irq_data;
 814         irq_hw_number_t hwirq;
 815         unsigned int type = IRQ_TYPE_NONE;
 816         int virq;
 817
 818         if (fwspec->fwnode) {
 819                 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
 820                 if (!domain)
 821                         domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
 822         } else {
 823                 domain = irq_default_domain;
 824         }
 825
 826         if (!domain) {
 827                 pr_warn("no irq domain found for %s !\n",
 828                         of_node_full_name(to_of_node(fwspec->fwnode)));
 829                 return 0;
 830         }
 831
 832         if (irq_domain_translate(domain, fwspec, &hwirq, &type))
 833                 return 0;
 834
 835         /*
 836          * WARN if the irqchip returns a type with bits
 837          * outside the sense mask set and clear these bits.
 838          */
 839         if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
 840                 type &= IRQ_TYPE_SENSE_MASK;
 841
 842         mutex_lock(&irq_domain_mutex);
 843
 844         /*
 845          * If we've already configured this interrupt,
 846          * don't do it again, or hell will break loose.
 847          */
 848         virq = irq_find_mapping(domain, hwirq);
 849         if (virq) {
 850                 /*
 851                  * If the trigger type is not specified or matches the
 852                  * current trigger type then we are done so return the
 853                  * interrupt number.
 854                  */
 855                 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
 856                         goto out;
 857
 858                 /*
 859                  * If the trigger type has not been set yet, then set
 860                  * it now and return the interrupt number.
 861                  */
 862                 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
 863                         irq_data = irq_get_irq_data(virq);
 864                         if (!irq_data) {
 865                                 virq = 0;
 866                                 goto out;
 867                         }
 868
 869                         irqd_set_trigger_type(irq_data, type);
 870                         goto out;
 871                 }
 872
 873                 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
 874                         hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
 875                 virq = 0;
 876                 goto out;
 877         }
 878
 879         if (irq_domain_is_hierarchy(domain)) {
 880                 virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
 881                                                     fwspec, false, NULL);
 882                 if (virq <= 0) {
 883                         virq = 0;
 884                         goto out;
 885                 }
 886         } else {
 887                 /* Create mapping */
 888                 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
 889                 if (!virq)
 890                         goto out;
 891         }
 892
 893         irq_data = irq_get_irq_data(virq);
 894         if (WARN_ON(!irq_data)) {
 895                 virq = 0;
 896                 goto out;
 897         }
 898
 899         /* Store trigger type */
 900         irqd_set_trigger_type(irq_data, type);
 901 out:
 902         mutex_unlock(&irq_domain_mutex);
 903
 904         return virq;
 905 }
 906 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
 907
 908 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
 909 {
 910         struct irq_fwspec fwspec;
 911
 912         of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
 913                                   irq_data->args_count, &fwspec);
 914
 915         return irq_create_fwspec_mapping(&fwspec);
 916 }
 917 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 918
 919 /**
 920  * irq_dispose_mapping() - Unmap an interrupt
 921  * @virq: linux irq number of the interrupt to unmap
 922  */
 923 void irq_dispose_mapping(unsigned int virq)
 924 {
 925         struct irq_data *irq_data = irq_get_irq_data(virq);
 926         struct irq_domain *domain;
 927
 928         if (!virq || !irq_data)
 929                 return;
 930
 931         domain = irq_data->domain;
 932         if (WARN_ON(domain == NULL))
 933                 return;
 934
 935         if (irq_domain_is_hierarchy(domain)) {
 936                 irq_domain_free_irqs(virq, 1);
 937         } else {
 938                 irq_domain_disassociate(domain, virq);
 939                 irq_free_desc(virq);
 940         }
 941 }
 942 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 943
 944 /**
 945  * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
 946  * @domain: domain owning this hardware interrupt
 947  * @hwirq: hardware irq number in that domain space
 948  * @irq: optional pointer to return the Linux irq if required
 949  *
 950  * Returns the interrupt descriptor.
 951  */
 952 struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
 953                                        irq_hw_number_t hwirq,
 954                                        unsigned int *irq)
 955 {
 956         struct irq_desc *desc = NULL;
 957         struct irq_data *data;
 958
 959         /* Look for default domain if necessary */
 960         if (domain == NULL)
 961                 domain = irq_default_domain;
 962         if (domain == NULL)
 963                 return desc;
 964
 965         if (irq_domain_is_nomap(domain)) {
 966                 if (hwirq < domain->revmap_size) {
 967                         data = irq_domain_get_irq_data(domain, hwirq);
 968                         if (data && data->hwirq == hwirq)
 969                                 desc = irq_data_to_desc(data);
 970                         if (irq && desc)
 971                                 *irq = hwirq;
 972                 }
 973
 974                 return desc;
 975         }
 976
 977         rcu_read_lock();
 978         /* Check if the hwirq is in the linear revmap. */
 979         if (hwirq < domain->revmap_size)
 980                 data = rcu_dereference(domain->revmap[hwirq]);
 981         else
 982                 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
 983
 984         if (likely(data)) {
 985                 desc = irq_data_to_desc(data);
 986                 if (irq)
 987                         *irq = data->irq;
 988         }
 989
 990         rcu_read_unlock();
 991         return desc;
 992 }
 993 EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
 994
 995 /**
 996  * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
 997  *
 998  * Device Tree IRQ specifier translation function which works with one cell
 999  * bindings where the cell value maps directly to the hwirq number.
1000  */
1001 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
1002                              const u32 *intspec, unsigned int intsize,
1003                              unsigned long *out_hwirq, unsigned int *out_type)
1004 {
1005         if (WARN_ON(intsize < 1))
1006                 return -EINVAL;
1007         *out_hwirq = intspec[0];
1008         *out_type = IRQ_TYPE_NONE;
1009         return 0;
1010 }
1011 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
1012
1013 /**
1014  * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1015  *
1016  * Device Tree IRQ specifier translation function which works with two cell
1017  * bindings where the cell values map directly to the hwirq number
1018  * and linux irq flags.
1019  */
1020 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1021                         const u32 *intspec, unsigned int intsize,
1022                         irq_hw_number_t *out_hwirq, unsigned int *out_type)
1023 {
1024         struct irq_fwspec fwspec;
1025
1026         of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1027         return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1028 }
1029 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1030
1031 /**
1032  * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1033  *
1034  * Device Tree IRQ specifier translation function which works with either one
1035  * or two cell bindings where the cell values map directly to the hwirq number
1036  * and linux irq flags.
1037  *
1038  * Note: don't use this function unless your interrupt controller explicitly
1039  * supports both one and two cell bindings.  For the majority of controllers
1040  * the _onecell() or _twocell() variants above should be used.
1041  */
1042 int irq_domain_xlate_onetwocell(struct irq_domain *d,
1043                                 struct device_node *ctrlr,
1044                                 const u32 *intspec, unsigned int intsize,
1045                                 unsigned long *out_hwirq, unsigned int *out_type)
1046 {
1047         if (WARN_ON(intsize < 1))
1048                 return -EINVAL;
1049         *out_hwirq = intspec[0];
1050         if (intsize > 1)
1051                 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1052         else
1053                 *out_type = IRQ_TYPE_NONE;
1054         return 0;
1055 }
1056 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1057
1058 const struct irq_domain_ops irq_domain_simple_ops = {
1059         .xlate = irq_domain_xlate_onetwocell,
1060 };
1061 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1062
1063 /**
1064  * irq_domain_translate_onecell() - Generic translate for direct one cell
1065  * bindings
1066  */
1067 int irq_domain_translate_onecell(struct irq_domain *d,
1068                                  struct irq_fwspec *fwspec,
1069                                  unsigned long *out_hwirq,
1070                                  unsigned int *out_type)
1071 {
1072         if (WARN_ON(fwspec->param_count < 1))
1073                 return -EINVAL;
1074         *out_hwirq = fwspec->param[0];
1075         *out_type = IRQ_TYPE_NONE;
1076         return 0;
1077 }
1078 EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1079
1080 /**
1081  * irq_domain_translate_twocell() - Generic translate for direct two cell
1082  * bindings
1083  *
1084  * Device Tree IRQ specifier translation function which works with two cell
1085  * bindings where the cell values map directly to the hwirq number
1086  * and linux irq flags.
1087  */
1088 int irq_domain_translate_twocell(struct irq_domain *d,
1089                                  struct irq_fwspec *fwspec,
1090                                  unsigned long *out_hwirq,
1091                                  unsigned int *out_type)
1092 {
1093         if (WARN_ON(fwspec->param_count < 2))
1094                 return -EINVAL;
1095         *out_hwirq = fwspec->param[0];
1096         *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1097         return 0;
1098 }
1099 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1100
1101 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1102                            int node, const struct irq_affinity_desc *affinity)
1103 {
1104         unsigned int hint;
1105
1106         if (virq >= 0) {
1107                 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1108                                          affinity);
1109         } else {
1110                 hint = hwirq % nr_irqs;
1111                 if (hint == 0)
1112                         hint++;
1113                 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1114                                          affinity);
1115                 if (virq <= 0 && hint > 1) {
1116                         virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1117                                                  affinity);
1118                 }
1119         }
1120
1121         return virq;
1122 }
1123
1124 /**
1125  * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1126  * @irq_data:   The pointer to irq_data
1127  */
1128 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1129 {
1130         irq_data->hwirq = 0;
1131         irq_data->chip = &no_irq_chip;
1132         irq_data->chip_data = NULL;
1133 }
1134 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1135
1136 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1137 /**
1138  * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1139  * @parent:     Parent irq domain to associate with the new domain
1140  * @flags:      Irq domain flags associated to the domain
1141  * @size:       Size of the domain. See below
1142  * @fwnode:     Optional fwnode of the interrupt controller
1143  * @ops:        Pointer to the interrupt domain callbacks
1144  * @host_data:  Controller private data pointer
1145  *
1146  * If @size is 0 a tree domain is created, otherwise a linear domain.
1147  *
1148  * If successful the parent is associated to the new domain and the
1149  * domain flags are set.
1150  * Returns pointer to IRQ domain, or NULL on failure.
1151  */
1152 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1153                                             unsigned int flags,
1154                                             unsigned int size,
1155                                             struct fwnode_handle *fwnode,
1156                                             const struct irq_domain_ops *ops,
1157                                             void *host_data)
1158 {
1159         struct irq_domain *domain;
1160
1161         if (size)
1162                 domain = __irq_domain_create(fwnode, size, size, 0, ops, host_data);
1163         else
1164                 domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
1165
1166         if (domain) {
1167                 domain->parent = parent;
1168                 domain->flags |= flags;
1169
1170                 __irq_domain_publish(domain);
1171         }
1172
1173         return domain;
1174 }
1175 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1176
1177 static void irq_domain_insert_irq(int virq)
1178 {
1179         struct irq_data *data;
1180
1181         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1182                 struct irq_domain *domain = data->domain;
1183
1184                 domain->mapcount++;
1185                 irq_domain_set_mapping(domain, data->hwirq, data);
1186
1187                 /* If not already assigned, give the domain the chip's name */
1188                 if (!domain->name && data->chip)
1189                         domain->name = data->chip->name;
1190         }
1191
1192         irq_clear_status_flags(virq, IRQ_NOREQUEST);
1193 }
1194
1195 static void irq_domain_remove_irq(int virq)
1196 {
1197         struct irq_data *data;
1198
1199         irq_set_status_flags(virq, IRQ_NOREQUEST);
1200         irq_set_chip_and_handler(virq, NULL, NULL);
1201         synchronize_irq(virq);
1202         smp_mb();
1203
1204         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1205                 struct irq_domain *domain = data->domain;
1206                 irq_hw_number_t hwirq = data->hwirq;
1207
1208                 domain->mapcount--;
1209                 irq_domain_clear_mapping(domain, hwirq);
1210         }
1211 }
1212
1213 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1214                                                    struct irq_data *child)
1215 {
1216         struct irq_data *irq_data;
1217
1218         irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1219                                 irq_data_get_node(child));
1220         if (irq_data) {
1221                 child->parent_data = irq_data;
1222                 irq_data->irq = child->irq;
1223                 irq_data->common = child->common;
1224                 irq_data->domain = domain;
1225         }
1226
1227         return irq_data;
1228 }
1229
1230 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1231 {
1232         struct irq_data *tmp;
1233
1234         while (irq_data) {
1235                 tmp = irq_data;
1236                 irq_data = irq_data->parent_data;
1237                 kfree(tmp);
1238         }
1239 }
1240
1241 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1242 {
1243         struct irq_data *irq_data, *tmp;
1244         int i;
1245
1246         for (i = 0; i < nr_irqs; i++) {
1247                 irq_data = irq_get_irq_data(virq + i);
1248                 tmp = irq_data->parent_data;
1249                 irq_data->parent_data = NULL;
1250                 irq_data->domain = NULL;
1251
1252                 __irq_domain_free_hierarchy(tmp);
1253         }
1254 }
1255
1256 /**
1257  * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1258  * @domain:     IRQ domain from which the hierarchy is to be disconnected
1259  * @virq:       IRQ number where the hierarchy is to be trimmed
1260  *
1261  * Marks the @virq level belonging to @domain as disconnected.
1262  * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1263  * to @domain.
1264  *
1265  * Its only use is to be able to trim levels of hierarchy that do not
1266  * have any real meaning for this interrupt, and that the driver marks
1267  * as such from its .alloc() callback.
1268  */
1269 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1270                                     unsigned int virq)
1271 {
1272         struct irq_data *irqd;
1273
1274         irqd = irq_domain_get_irq_data(domain, virq);
1275         if (!irqd)
1276                 return -EINVAL;
1277
1278         irqd->chip = ERR_PTR(-ENOTCONN);
1279         return 0;
1280 }
1281 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1282
1283 static int irq_domain_trim_hierarchy(unsigned int virq)
1284 {
1285         struct irq_data *tail, *irqd, *irq_data;
1286
1287         irq_data = irq_get_irq_data(virq);
1288         tail = NULL;
1289
1290         /* The first entry must have a valid irqchip */
1291         if (!irq_data->chip || IS_ERR(irq_data->chip))
1292                 return -EINVAL;
1293
1294         /*
1295          * Validate that the irq_data chain is sane in the presence of
1296          * a hierarchy trimming marker.
1297          */
1298         for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1299                 /* Can't have a valid irqchip after a trim marker */
1300                 if (irqd->chip && tail)
1301                         return -EINVAL;
1302
1303                 /* Can't have an empty irqchip before a trim marker */
1304                 if (!irqd->chip && !tail)
1305                         return -EINVAL;
1306
1307                 if (IS_ERR(irqd->chip)) {
1308                         /* Only -ENOTCONN is a valid trim marker */
1309                         if (PTR_ERR(irqd->chip) != -ENOTCONN)
1310                                 return -EINVAL;
1311
1312                         tail = irq_data;
1313                 }
1314         }
1315
1316         /* No trim marker, nothing to do */
1317         if (!tail)
1318                 return 0;
1319
1320         pr_info("IRQ%d: trimming hierarchy from %s\n",
1321                 virq, tail->parent_data->domain->name);
1322
1323         /* Sever the inner part of the hierarchy...  */
1324         irqd = tail;
1325         tail = tail->parent_data;
1326         irqd->parent_data = NULL;
1327         __irq_domain_free_hierarchy(tail);
1328
1329         return 0;
1330 }
1331
1332 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1333                                      unsigned int virq, unsigned int nr_irqs)
1334 {
1335         struct irq_data *irq_data;
1336         struct irq_domain *parent;
1337         int i;
1338
1339         /* The outermost irq_data is embedded in struct irq_desc */
1340         for (i = 0; i < nr_irqs; i++) {
1341                 irq_data = irq_get_irq_data(virq + i);
1342                 irq_data->domain = domain;
1343
1344                 for (parent = domain->parent; parent; parent = parent->parent) {
1345                         irq_data = irq_domain_insert_irq_data(parent, irq_data);
1346                         if (!irq_data) {
1347                                 irq_domain_free_irq_data(virq, i + 1);
1348                                 return -ENOMEM;
1349                         }
1350                 }
1351         }
1352
1353         return 0;
1354 }
1355
1356 /**
1357  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1358  * @domain:     domain to match
1359  * @virq:       IRQ number to get irq_data
1360  */
1361 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1362                                          unsigned int virq)
1363 {
1364         struct irq_data *irq_data;
1365
1366         for (irq_data = irq_get_irq_data(virq); irq_data;
1367              irq_data = irq_data->parent_data)
1368                 if (irq_data->domain == domain)
1369                         return irq_data;
1370
1371         return NULL;
1372 }
1373 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1374
1375 /**
1376  * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1377  * @domain:     Interrupt domain to match
1378  * @virq:       IRQ number
1379  * @hwirq:      The hwirq number
1380  * @chip:       The associated interrupt chip
1381  * @chip_data:  The associated chip data
1382  */
1383 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1384                                   irq_hw_number_t hwirq, struct irq_chip *chip,
1385                                   void *chip_data)
1386 {
1387         struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1388
1389         if (!irq_data)
1390                 return -ENOENT;
1391
1392         irq_data->hwirq = hwirq;
1393         irq_data->chip = chip ? chip : &no_irq_chip;
1394         irq_data->chip_data = chip_data;
1395
1396         return 0;
1397 }
1398 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1399
1400 /**
1401  * irq_domain_set_info - Set the complete data for a @virq in @domain
1402  * @domain:             Interrupt domain to match
1403  * @virq:               IRQ number
1404  * @hwirq:              The hardware interrupt number
1405  * @chip:               The associated interrupt chip
1406  * @chip_data:          The associated interrupt chip data
1407  * @handler:            The interrupt flow handler
1408  * @handler_data:       The interrupt flow handler data
1409  * @handler_name:       The interrupt handler name
1410  */
1411 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1412                          irq_hw_number_t hwirq, struct irq_chip *chip,
1413                          void *chip_data, irq_flow_handler_t handler,
1414                          void *handler_data, const char *handler_name)
1415 {
1416         irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1417         __irq_set_handler(virq, handler, 0, handler_name);
1418         irq_set_handler_data(virq, handler_data);
1419 }
1420 EXPORT_SYMBOL(irq_domain_set_info);
1421
1422 /**
1423  * irq_domain_free_irqs_common - Clear irq_data and free the parent
1424  * @domain:     Interrupt domain to match
1425  * @virq:       IRQ number to start with
1426  * @nr_irqs:    The number of irqs to free
1427  */
1428 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1429                                  unsigned int nr_irqs)
1430 {
1431         struct irq_data *irq_data;
1432         int i;
1433
1434         for (i = 0; i < nr_irqs; i++) {
1435                 irq_data = irq_domain_get_irq_data(domain, virq + i);
1436                 if (irq_data)
1437                         irq_domain_reset_irq_data(irq_data);
1438         }
1439         irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1440 }
1441 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1442
1443 /**
1444  * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1445  * @domain:     Interrupt domain to match
1446  * @virq:       IRQ number to start with
1447  * @nr_irqs:    The number of irqs to free
1448  */
1449 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1450                               unsigned int nr_irqs)
1451 {
1452         int i;
1453
1454         for (i = 0; i < nr_irqs; i++) {
1455                 irq_set_handler_data(virq + i, NULL);
1456                 irq_set_handler(virq + i, NULL);
1457         }
1458         irq_domain_free_irqs_common(domain, virq, nr_irqs);
1459 }
1460
1461 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1462                                            unsigned int irq_base,
1463                                            unsigned int nr_irqs)
1464 {
1465         unsigned int i;
1466
1467         if (!domain->ops->free)
1468                 return;
1469
1470         for (i = 0; i < nr_irqs; i++) {
1471                 if (irq_domain_get_irq_data(domain, irq_base + i))
1472                         domain->ops->free(domain, irq_base + i, 1);
1473         }
1474 }
1475
1476 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1477                                     unsigned int irq_base,
1478                                     unsigned int nr_irqs, void *arg)
1479 {
1480         if (!domain->ops->alloc) {
1481                 pr_debug("domain->ops->alloc() is NULL\n");
1482                 return -ENOSYS;
1483         }
1484
1485         return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1486 }
1487
1488 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1489                                         unsigned int nr_irqs, int node, void *arg,
1490                                         bool realloc, const struct irq_affinity_desc *affinity)
1491 {
1492         int i, ret, virq;
1493
1494         if (realloc && irq_base >= 0) {
1495                 virq = irq_base;
1496         } else {
1497                 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1498                                               affinity);
1499                 if (virq < 0) {
1500                         pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1501                                  irq_base, nr_irqs);
1502                         return virq;
1503                 }
1504         }
1505
1506         if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1507                 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1508                 ret = -ENOMEM;
1509                 goto out_free_desc;
1510         }
1511
1512         ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1513         if (ret < 0)
1514                 goto out_free_irq_data;
1515
1516         for (i = 0; i < nr_irqs; i++) {
1517                 ret = irq_domain_trim_hierarchy(virq + i);
1518                 if (ret)
1519                         goto out_free_irq_data;
1520         }
1521
1522         for (i = 0; i < nr_irqs; i++)
1523                 irq_domain_insert_irq(virq + i);
1524
1525         return virq;
1526
1527 out_free_irq_data:
1528         irq_domain_free_irq_data(virq, nr_irqs);
1529 out_free_desc:
1530         irq_free_descs(virq, nr_irqs);
1531         return ret;
1532 }
1533
1534 /**
1535  * __irq_domain_alloc_irqs - Allocate IRQs from domain
1536  * @domain:     domain to allocate from
1537  * @irq_base:   allocate specified IRQ number if irq_base >= 0
1538  * @nr_irqs:    number of IRQs to allocate
1539  * @node:       NUMA node id for memory allocation
1540  * @arg:        domain specific argument
1541  * @realloc:    IRQ descriptors have already been allocated if true
1542  * @affinity:   Optional irq affinity mask for multiqueue devices
1543  *
1544  * Allocate IRQ numbers and initialized all data structures to support
1545  * hierarchy IRQ domains.
1546  * Parameter @realloc is mainly to support legacy IRQs.
1547  * Returns error code or allocated IRQ number
1548  *
1549  * The whole process to setup an IRQ has been split into two steps.
1550  * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1551  * descriptor and required hardware resources. The second step,
1552  * irq_domain_activate_irq(), is to program the hardware with preallocated
1553  * resources. In this way, it's easier to rollback when failing to
1554  * allocate resources.
1555  */
1556 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1557                             unsigned int nr_irqs, int node, void *arg,
1558                             bool realloc, const struct irq_affinity_desc *affinity)
1559 {
1560         int ret;
1561
1562         if (domain == NULL) {
1563                 domain = irq_default_domain;
1564                 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1565                         return -EINVAL;
1566         }
1567
1568         mutex_lock(&irq_domain_mutex);
1569         ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1570                                            realloc, affinity);
1571         mutex_unlock(&irq_domain_mutex);
1572
1573         return ret;
1574 }
1575
1576 /* The irq_data was moved, fix the revmap to refer to the new location */
1577 static void irq_domain_fix_revmap(struct irq_data *d)
1578 {
1579         void __rcu **slot;
1580
1581         if (irq_domain_is_nomap(d->domain))
1582                 return;
1583
1584         /* Fix up the revmap. */
1585         mutex_lock(&d->domain->revmap_mutex);
1586         if (d->hwirq < d->domain->revmap_size) {
1587                 /* Not using radix tree */
1588                 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1589         } else {
1590                 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1591                 if (slot)
1592                         radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1593         }
1594         mutex_unlock(&d->domain->revmap_mutex);
1595 }
1596
1597 /**
1598  * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1599  * @domain:     Domain to push.
1600  * @virq:       Irq to push the domain in to.
1601  * @arg:        Passed to the irq_domain_ops alloc() function.
1602  *
1603  * For an already existing irqdomain hierarchy, as might be obtained
1604  * via a call to pci_enable_msix(), add an additional domain to the
1605  * head of the processing chain.  Must be called before request_irq()
1606  * has been called.
1607  */
1608 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1609 {
1610         struct irq_data *child_irq_data;
1611         struct irq_data *root_irq_data = irq_get_irq_data(virq);
1612         struct irq_desc *desc;
1613         int rv = 0;
1614
1615         /*
1616          * Check that no action has been set, which indicates the virq
1617          * is in a state where this function doesn't have to deal with
1618          * races between interrupt handling and maintaining the
1619          * hierarchy.  This will catch gross misuse.  Attempting to
1620          * make the check race free would require holding locks across
1621          * calls to struct irq_domain_ops->alloc(), which could lead
1622          * to deadlock, so we just do a simple check before starting.
1623          */
1624         desc = irq_to_desc(virq);
1625         if (!desc)
1626                 return -EINVAL;
1627         if (WARN_ON(desc->action))
1628                 return -EBUSY;
1629
1630         if (domain == NULL)
1631                 return -EINVAL;
1632
1633         if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1634                 return -EINVAL;
1635
1636         if (!root_irq_data)
1637                 return -EINVAL;
1638
1639         if (domain->parent != root_irq_data->domain)
1640                 return -EINVAL;
1641
1642         child_irq_data = kzalloc_node(sizeof(*child_irq_data), GFP_KERNEL,
1643                                       irq_data_get_node(root_irq_data));
1644         if (!child_irq_data)
1645                 return -ENOMEM;
1646
1647         mutex_lock(&irq_domain_mutex);
1648
1649         /* Copy the original irq_data. */
1650         *child_irq_data = *root_irq_data;
1651
1652         /*
1653          * Overwrite the root_irq_data, which is embedded in struct
1654          * irq_desc, with values for this domain.
1655          */
1656         root_irq_data->parent_data = child_irq_data;
1657         root_irq_data->domain = domain;
1658         root_irq_data->mask = 0;
1659         root_irq_data->hwirq = 0;
1660         root_irq_data->chip = NULL;
1661         root_irq_data->chip_data = NULL;
1662
1663         /* May (probably does) set hwirq, chip, etc. */
1664         rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1665         if (rv) {
1666                 /* Restore the original irq_data. */
1667                 *root_irq_data = *child_irq_data;
1668                 kfree(child_irq_data);
1669                 goto error;
1670         }
1671
1672         irq_domain_fix_revmap(child_irq_data);
1673         irq_domain_set_mapping(domain, root_irq_data->hwirq, root_irq_data);
1674
1675 error:
1676         mutex_unlock(&irq_domain_mutex);
1677
1678         return rv;
1679 }
1680 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1681
1682 /**
1683  * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1684  * @domain:     Domain to remove.
1685  * @virq:       Irq to remove the domain from.
1686  *
1687  * Undo the effects of a call to irq_domain_push_irq().  Must be
1688  * called either before request_irq() or after free_irq().
1689  */
1690 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1691 {
1692         struct irq_data *root_irq_data = irq_get_irq_data(virq);
1693         struct irq_data *child_irq_data;
1694         struct irq_data *tmp_irq_data;
1695         struct irq_desc *desc;
1696
1697         /*
1698          * Check that no action is set, which indicates the virq is in
1699          * a state where this function doesn't have to deal with races
1700          * between interrupt handling and maintaining the hierarchy.
1701          * This will catch gross misuse.  Attempting to make the check
1702          * race free would require holding locks across calls to
1703          * struct irq_domain_ops->free(), which could lead to
1704          * deadlock, so we just do a simple check before starting.
1705          */
1706         desc = irq_to_desc(virq);
1707         if (!desc)
1708                 return -EINVAL;
1709         if (WARN_ON(desc->action))
1710                 return -EBUSY;
1711
1712         if (domain == NULL)
1713                 return -EINVAL;
1714
1715         if (!root_irq_data)
1716                 return -EINVAL;
1717
1718         tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1719
1720         /* We can only "pop" if this domain is at the top of the list */
1721         if (WARN_ON(root_irq_data != tmp_irq_data))
1722                 return -EINVAL;
1723
1724         if (WARN_ON(root_irq_data->domain != domain))
1725                 return -EINVAL;
1726
1727         child_irq_data = root_irq_data->parent_data;
1728         if (WARN_ON(!child_irq_data))
1729                 return -EINVAL;
1730
1731         mutex_lock(&irq_domain_mutex);
1732
1733         root_irq_data->parent_data = NULL;
1734
1735         irq_domain_clear_mapping(domain, root_irq_data->hwirq);
1736         irq_domain_free_irqs_hierarchy(domain, virq, 1);
1737
1738         /* Restore the original irq_data. */
1739         *root_irq_data = *child_irq_data;
1740
1741         irq_domain_fix_revmap(root_irq_data);
1742
1743         mutex_unlock(&irq_domain_mutex);
1744
1745         kfree(child_irq_data);
1746
1747         return 0;
1748 }
1749 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1750
1751 /**
1752  * irq_domain_free_irqs - Free IRQ number and associated data structures
1753  * @virq:       base IRQ number
1754  * @nr_irqs:    number of IRQs to free
1755  */
1756 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1757 {
1758         struct irq_data *data = irq_get_irq_data(virq);
1759         int i;
1760
1761         if (WARN(!data || !data->domain || !data->domain->ops->free,
1762                  "NULL pointer, cannot free irq\n"))
1763                 return;
1764
1765         mutex_lock(&irq_domain_mutex);
1766         for (i = 0; i < nr_irqs; i++)
1767                 irq_domain_remove_irq(virq + i);
1768         irq_domain_free_irqs_hierarchy(data->domain, virq, nr_irqs);
1769         mutex_unlock(&irq_domain_mutex);
1770
1771         irq_domain_free_irq_data(virq, nr_irqs);
1772         irq_free_descs(virq, nr_irqs);
1773 }
1774
1775 /**
1776  * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1777  * @domain:     Domain below which interrupts must be allocated
1778  * @irq_base:   Base IRQ number
1779  * @nr_irqs:    Number of IRQs to allocate
1780  * @arg:        Allocation data (arch/domain specific)
1781  */
1782 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1783                                  unsigned int irq_base, unsigned int nr_irqs,
1784                                  void *arg)
1785 {
1786         if (!domain->parent)
1787                 return -ENOSYS;
1788
1789         return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1790                                                nr_irqs, arg);
1791 }
1792 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1793
1794 /**
1795  * irq_domain_free_irqs_parent - Free interrupts from parent domain
1796  * @domain:     Domain below which interrupts must be freed
1797  * @irq_base:   Base IRQ number
1798  * @nr_irqs:    Number of IRQs to free
1799  */
1800 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1801                                  unsigned int irq_base, unsigned int nr_irqs)
1802 {
1803         if (!domain->parent)
1804                 return;
1805
1806         irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1807 }
1808 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1809
1810 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1811 {
1812         if (irq_data && irq_data->domain) {
1813                 struct irq_domain *domain = irq_data->domain;
1814
1815                 if (domain->ops->deactivate)
1816                         domain->ops->deactivate(domain, irq_data);
1817                 if (irq_data->parent_data)
1818                         __irq_domain_deactivate_irq(irq_data->parent_data);
1819         }
1820 }
1821
1822 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1823 {
1824         int ret = 0;
1825
1826         if (irqd && irqd->domain) {
1827                 struct irq_domain *domain = irqd->domain;
1828
1829                 if (irqd->parent_data)
1830                         ret = __irq_domain_activate_irq(irqd->parent_data,
1831                                                         reserve);
1832                 if (!ret && domain->ops->activate) {
1833                         ret = domain->ops->activate(domain, irqd, reserve);
1834                         /* Rollback in case of error */
1835                         if (ret && irqd->parent_data)
1836                                 __irq_domain_deactivate_irq(irqd->parent_data);
1837                 }
1838         }
1839         return ret;
1840 }
1841
1842 /**
1843  * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1844  *                           interrupt
1845  * @irq_data:   Outermost irq_data associated with interrupt
1846  * @reserve:    If set only reserve an interrupt vector instead of assigning one
1847  *
1848  * This is the second step to call domain_ops->activate to program interrupt
1849  * controllers, so the interrupt could actually get delivered.
1850  */
1851 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1852 {
1853         int ret = 0;
1854
1855         if (!irqd_is_activated(irq_data))
1856                 ret = __irq_domain_activate_irq(irq_data, reserve);
1857         if (!ret)
1858                 irqd_set_activated(irq_data);
1859         return ret;
1860 }
1861
1862 /**
1863  * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1864  *                             deactivate interrupt
1865  * @irq_data: outermost irq_data associated with interrupt
1866  *
1867  * It calls domain_ops->deactivate to program interrupt controllers to disable
1868  * interrupt delivery.
1869  */
1870 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1871 {
1872         if (irqd_is_activated(irq_data)) {
1873                 __irq_domain_deactivate_irq(irq_data);
1874                 irqd_clr_activated(irq_data);
1875         }
1876 }
1877
1878 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1879 {
1880         /* Hierarchy irq_domains must implement callback alloc() */
1881         if (domain->ops->alloc)
1882                 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1883 }
1884
1885 /**
1886  * irq_domain_hierarchical_is_msi_remap - Check if the domain or any
1887  * parent has MSI remapping support
1888  * @domain: domain pointer
1889  */
1890 bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
1891 {
1892         for (; domain; domain = domain->parent) {
1893                 if (irq_domain_is_msi_remap(domain))
1894                         return true;
1895         }
1896         return false;
1897 }
1898 #else   /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1899 /**
1900  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1901  * @domain:     domain to match
1902  * @virq:       IRQ number to get irq_data
1903  */
1904 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1905                                          unsigned int virq)
1906 {
1907         struct irq_data *irq_data = irq_get_irq_data(virq);
1908
1909         return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1910 }
1911 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1912
1913 /**
1914  * irq_domain_set_info - Set the complete data for a @virq in @domain
1915  * @domain:             Interrupt domain to match
1916  * @virq:               IRQ number
1917  * @hwirq:              The hardware interrupt number
1918  * @chip:               The associated interrupt chip
1919  * @chip_data:          The associated interrupt chip data
1920  * @handler:            The interrupt flow handler
1921  * @handler_data:       The interrupt flow handler data
1922  * @handler_name:       The interrupt handler name
1923  */
1924 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1925                          irq_hw_number_t hwirq, struct irq_chip *chip,
1926                          void *chip_data, irq_flow_handler_t handler,
1927                          void *handler_data, const char *handler_name)
1928 {
1929         irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1930         irq_set_chip_data(virq, chip_data);
1931         irq_set_handler_data(virq, handler_data);
1932 }
1933
1934 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1935                                         unsigned int nr_irqs, int node, void *arg,
1936                                         bool realloc, const struct irq_affinity_desc *affinity)
1937 {
1938         return -EINVAL;
1939 }
1940
1941 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1942 {
1943 }
1944 #endif  /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1945
1946 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1947 static struct dentry *domain_dir;
1948
1949 static void
1950 irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1951 {
1952         seq_printf(m, "%*sname:   %s\n", ind, "", d->name);
1953         seq_printf(m, "%*ssize:   %u\n", ind + 1, "", d->revmap_size);
1954         seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1955         seq_printf(m, "%*sflags:  0x%08x\n", ind +1 , "", d->flags);
1956         if (d->ops && d->ops->debug_show)
1957                 d->ops->debug_show(m, d, NULL, ind + 1);
1958 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1959         if (!d->parent)
1960                 return;
1961         seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1962         irq_domain_debug_show_one(m, d->parent, ind + 4);
1963 #endif
1964 }
1965
1966 static int irq_domain_debug_show(struct seq_file *m, void *p)
1967 {
1968         struct irq_domain *d = m->private;
1969
1970         /* Default domain? Might be NULL */
1971         if (!d) {
1972                 if (!irq_default_domain)
1973                         return 0;
1974                 d = irq_default_domain;
1975         }
1976         irq_domain_debug_show_one(m, d, 0);
1977         return 0;
1978 }
1979 DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1980
1981 static void debugfs_add_domain_dir(struct irq_domain *d)
1982 {
1983         if (!d->name || !domain_dir)
1984                 return;
1985         debugfs_create_file(d->name, 0444, domain_dir, d,
1986                             &irq_domain_debug_fops);
1987 }
1988
1989 static void debugfs_remove_domain_dir(struct irq_domain *d)
1990 {
1991         debugfs_lookup_and_remove(d->name, domain_dir);
1992 }
1993
1994 void __init irq_domain_debugfs_init(struct dentry *root)
1995 {
1996         struct irq_domain *d;
1997
1998         domain_dir = debugfs_create_dir("domains", root);
1999
2000         debugfs_create_file("default", 0444, domain_dir, NULL,
2001                             &irq_domain_debug_fops);
2002         mutex_lock(&irq_domain_mutex);
2003         list_for_each_entry(d, &irq_domain_list, link)
2004                 debugfs_add_domain_dir(d);
2005         mutex_unlock(&irq_domain_mutex);
2006 }
2007 #endif