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