kernel/irq/irqdomain.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #define pr_fmt(fmt)  "irq: " fmt
   4
   5 #include <linux/acpi.h>
   6 #include <linux/debugfs.h>
   7 #include <linux/hardirq.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/irq.h>
  10 #include <linux/irqdesc.h>
  11 #include <linux/irqdomain.h>
  12 #include <linux/module.h>
  13 #include <linux/mutex.h>
  14 #include <linux/of.h>
  15 #include <linux/of_address.h>
  16 #include <linux/of_irq.h>
  17 #include <linux/topology.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/slab.h>
  20 #include <linux/smp.h>
  21 #include <linux/fs.h>
  22
  23 static LIST_HEAD(irq_domain_list);
  24 static DEFINE_MUTEX(irq_domain_mutex);
  25
  26 static struct irq_domain *irq_default_domain;
  27
  28 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
  29                                         unsigned int nr_irqs, int node, void *arg,
  30                                         bool realloc, const struct irq_affinity_desc *affinity);
  31 static void irq_domain_check_hierarchy(struct irq_domain *domain);
  32
  33 struct irqchip_fwid {
  34         struct fwnode_handle    fwnode;
  35         unsigned int            type;
  36         char                    *name;
  37         phys_addr_t             *pa;
  38 };
  39
  40 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
  41 static void debugfs_add_domain_dir(struct irq_domain *d);
  42 static void debugfs_remove_domain_dir(struct irq_domain *d);
  43 #else
  44 static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
  45 static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
  46 #endif
  47
  48 static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
  49 {
  50         struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
  51
  52         return fwid->name;
  53 }
  54
  55 const struct fwnode_operations irqchip_fwnode_ops = {
  56         .get_name = irqchip_fwnode_get_name,
  57 };
  58 EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
  59
  60 /**
  61  * __irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
  62  *                           identifying an irq domain
  63  * @type:       Type of irqchip_fwnode. See linux/irqdomain.h
  64  * @id:         Optional user provided id if name != NULL
  65  * @name:       Optional user provided domain name
  66  * @pa:         Optional user-provided physical address
  67  *
  68  * Allocate a struct irqchip_fwid, and return a pointer to the embedded
  69  * fwnode_handle (or NULL on failure).
  70  *
  71  * Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
  72  * solely to transport name information to irqdomain creation code. The
  73  * node is not stored. For other types the pointer is kept in the irq
  74  * domain struct.
  75  */
  76 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
  77                                                 const char *name,
  78                                                 phys_addr_t *pa)
  79 {
  80         struct irqchip_fwid *fwid;
  81         char *n;
  82
  83         fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
  84
  85         switch (type) {
  86         case IRQCHIP_FWNODE_NAMED:
  87                 n = kasprintf(GFP_KERNEL, "%s", name);
  88                 break;
  89         case IRQCHIP_FWNODE_NAMED_ID:
  90                 n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
  91                 break;
  92         default:
  93                 n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
  94                 break;
  95         }
  96
  97         if (!fwid || !n) {
  98                 kfree(fwid);
  99                 kfree(n);
 100                 return NULL;
 101         }
 102
 103         fwid->type = type;
 104         fwid->name = n;
 105         fwid->pa = pa;
 106         fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
 107         return &fwid->fwnode;
 108 }
 109 EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
 110
 111 /**
 112  * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
 113  *
 114  * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
 115  */
 116 void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
 117 {
 118         struct irqchip_fwid *fwid;
 119
 120         if (!fwnode || WARN_ON(!is_fwnode_irqchip(fwnode)))
 121                 return;
 122
 123         fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
 124         kfree(fwid->name);
 125         kfree(fwid);
 126 }
 127 EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
 128
 129 static struct irq_domain *__irq_domain_create(struct fwnode_handle *fwnode,
 130                                               unsigned int size,
 131                                               irq_hw_number_t hwirq_max,
 132                                               int direct_max,
 133                                               const struct irq_domain_ops *ops,
 134                                               void *host_data)
 135 {
 136         struct irqchip_fwid *fwid;
 137         struct irq_domain *domain;
 138
 139         static atomic_t unknown_domains;
 140
 141         if (WARN_ON((size && direct_max) ||
 142                     (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max) ||
 143                     (direct_max && (direct_max != hwirq_max))))
 144                 return NULL;
 145
 146         domain = kzalloc_node(struct_size(domain, revmap, size),
 147                               GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
 148         if (!domain)
 149                 return NULL;
 150
 151         if (is_fwnode_irqchip(fwnode)) {
 152                 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
 153
 154                 switch (fwid->type) {
 155                 case IRQCHIP_FWNODE_NAMED:
 156                 case IRQCHIP_FWNODE_NAMED_ID:
 157                         domain->fwnode = fwnode;
 158                         domain->name = kstrdup(fwid->name, GFP_KERNEL);
 159                         if (!domain->name) {
 160                                 kfree(domain);
 161                                 return NULL;
 162                         }
 163                         domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 164                         break;
 165                 default:
 166                         domain->fwnode = fwnode;
 167                         domain->name = fwid->name;
 168                         break;
 169                 }
 170         } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
 171                    is_software_node(fwnode)) {
 172                 char *name;
 173
 174                 /*
 175                  * fwnode paths contain '/', which debugfs is legitimately
 176                  * unhappy about. Replace them with ':', which does
 177                  * the trick and is not as offensive as '\'...
 178                  */
 179                 name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
 180                 if (!name) {
 181                         kfree(domain);
 182                         return NULL;
 183                 }
 184
 185                 domain->name = strreplace(name, '/', ':');
 186                 domain->fwnode = fwnode;
 187                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 188         }
 189
 190         if (!domain->name) {
 191                 if (fwnode)
 192                         pr_err("Invalid fwnode type for irqdomain\n");
 193                 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
 194                                          atomic_inc_return(&unknown_domains));
 195                 if (!domain->name) {
 196                         kfree(domain);
 197                         return NULL;
 198                 }
 199                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 200         }
 201
 202         fwnode_handle_get(fwnode);
 203         fwnode_dev_initialized(fwnode, true);
 204
 205         /* Fill structure */
 206         INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
 207         domain->ops = ops;
 208         domain->host_data = host_data;
 209         domain->hwirq_max = hwirq_max;
 210
 211         if (direct_max)
 212                 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
 213
 214         domain->revmap_size = size;
 215
 216         /*
 217          * Hierarchical domains use the domain lock of the root domain
 218          * (innermost domain).
 219          *
 220          * For non-hierarchical domains (as for root domains), the root
 221          * pointer is set to the domain itself so that &domain->root->mutex
 222          * always points to the right lock.
 223          */
 224         mutex_init(&domain->mutex);
 225         domain->root = domain;
 226
 227         irq_domain_check_hierarchy(domain);
 228
 229         return domain;
 230 }
 231
 232 static void __irq_domain_publish(struct irq_domain *domain)
 233 {
 234         mutex_lock(&irq_domain_mutex);
 235         debugfs_add_domain_dir(domain);
 236         list_add(&domain->link, &irq_domain_list);
 237         mutex_unlock(&irq_domain_mutex);
 238
 239         pr_debug("Added domain %s\n", domain->name);
 240 }
 241
 242 /**
 243  * __irq_domain_add() - Allocate a new irq_domain data structure
 244  * @fwnode: firmware node for the interrupt controller
 245  * @size: Size of linear map; 0 for radix mapping only
 246  * @hwirq_max: Maximum number of interrupts supported by controller
 247  * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
 248  *              direct mapping
 249  * @ops: domain callbacks
 250  * @host_data: Controller private data pointer
 251  *
 252  * Allocates and initializes an irq_domain structure.
 253  * Returns pointer to IRQ domain, or NULL on failure.
 254  */
 255 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
 256                                     irq_hw_number_t hwirq_max, int direct_max,
 257                                     const struct irq_domain_ops *ops,
 258                                     void *host_data)
 259 {
 260         struct irq_domain *domain;
 261
 262         domain = __irq_domain_create(fwnode, size, hwirq_max, direct_max,
 263                                      ops, host_data);
 264         if (domain)
 265                 __irq_domain_publish(domain);
 266
 267         return domain;
 268 }
 269 EXPORT_SYMBOL_GPL(__irq_domain_add);
 270
 271 /**
 272  * irq_domain_remove() - Remove an irq domain.
 273  * @domain: domain to remove
 274  *
 275  * This routine is used to remove an irq domain. The caller must ensure
 276  * that all mappings within the domain have been disposed of prior to
 277  * use, depending on the revmap type.
 278  */
 279 void irq_domain_remove(struct irq_domain *domain)
 280 {
 281         mutex_lock(&irq_domain_mutex);
 282         debugfs_remove_domain_dir(domain);
 283
 284         WARN_ON(!radix_tree_empty(&domain->revmap_tree));
 285
 286         list_del(&domain->link);
 287
 288         /*
 289          * If the going away domain is the default one, reset it.
 290          */
 291         if (unlikely(irq_default_domain == domain))
 292                 irq_set_default_host(NULL);
 293
 294         mutex_unlock(&irq_domain_mutex);
 295
 296         pr_debug("Removed domain %s\n", domain->name);
 297
 298         fwnode_dev_initialized(domain->fwnode, false);
 299         fwnode_handle_put(domain->fwnode);
 300         if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
 301                 kfree(domain->name);
 302         kfree(domain);
 303 }
 304 EXPORT_SYMBOL_GPL(irq_domain_remove);
 305
 306 void irq_domain_update_bus_token(struct irq_domain *domain,
 307                                  enum irq_domain_bus_token bus_token)
 308 {
 309         char *name;
 310
 311         if (domain->bus_token == bus_token)
 312                 return;
 313
 314         mutex_lock(&irq_domain_mutex);
 315
 316         domain->bus_token = bus_token;
 317
 318         name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
 319         if (!name) {
 320                 mutex_unlock(&irq_domain_mutex);
 321                 return;
 322         }
 323
 324         debugfs_remove_domain_dir(domain);
 325
 326         if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
 327                 kfree(domain->name);
 328         else
 329                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
 330
 331         domain->name = name;
 332         debugfs_add_domain_dir(domain);
 333
 334         mutex_unlock(&irq_domain_mutex);
 335 }
 336 EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
 337
 338 /**
 339  * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
 340  * @fwnode: firmware node for the interrupt controller
 341  * @size: total number of irqs in mapping
 342  * @first_irq: first number of irq block assigned to the domain,
 343  *      pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
 344  *      pre-map all of the irqs in the domain to virqs starting at first_irq.
 345  * @ops: domain callbacks
 346  * @host_data: Controller private data pointer
 347  *
 348  * Allocates an irq_domain, and optionally if first_irq is positive then also
 349  * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
 350  *
 351  * This is intended to implement the expected behaviour for most
 352  * interrupt controllers. If device tree is used, then first_irq will be 0 and
 353  * irqs get mapped dynamically on the fly. However, if the controller requires
 354  * static virq assignments (non-DT boot) then it will set that up correctly.
 355  */
 356 struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
 357                                             unsigned int size,
 358                                             unsigned int first_irq,
 359                                             const struct irq_domain_ops *ops,
 360                                             void *host_data)
 361 {
 362         struct irq_domain *domain;
 363
 364         domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data);
 365         if (!domain)
 366                 return NULL;
 367
 368         if (first_irq > 0) {
 369                 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
 370                         /* attempt to allocated irq_descs */
 371                         int rc = irq_alloc_descs(first_irq, first_irq, size,
 372                                                  of_node_to_nid(to_of_node(fwnode)));
 373                         if (rc < 0)
 374                                 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
 375                                         first_irq);
 376                 }
 377                 irq_domain_associate_many(domain, first_irq, 0, size);
 378         }
 379
 380         return domain;
 381 }
 382 EXPORT_SYMBOL_GPL(irq_domain_create_simple);
 383
 384 /**
 385  * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
 386  * @of_node: pointer to interrupt controller's device tree node.
 387  * @size: total number of irqs in legacy mapping
 388  * @first_irq: first number of irq block assigned to the domain
 389  * @first_hwirq: first hwirq number to use for the translation. Should normally
 390  *               be '0', but a positive integer can be used if the effective
 391  *               hwirqs numbering does not begin at zero.
 392  * @ops: map/unmap domain callbacks
 393  * @host_data: Controller private data pointer
 394  *
 395  * Note: the map() callback will be called before this function returns
 396  * for all legacy interrupts except 0 (which is always the invalid irq for
 397  * a legacy controller).
 398  */
 399 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 400                                          unsigned int size,
 401                                          unsigned int first_irq,
 402                                          irq_hw_number_t first_hwirq,
 403                                          const struct irq_domain_ops *ops,
 404                                          void *host_data)
 405 {
 406         return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
 407                                         first_irq, first_hwirq, ops, host_data);
 408 }
 409 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 410
 411 struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
 412                                          unsigned int size,
 413                                          unsigned int first_irq,
 414                                          irq_hw_number_t first_hwirq,
 415                                          const struct irq_domain_ops *ops,
 416                                          void *host_data)
 417 {
 418         struct irq_domain *domain;
 419
 420         domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
 421         if (domain)
 422                 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
 423
 424         return domain;
 425 }
 426 EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
 427
 428 /**
 429  * irq_find_matching_fwspec() - Locates a domain for a given fwspec
 430  * @fwspec: FW specifier for an interrupt
 431  * @bus_token: domain-specific data
 432  */
 433 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
 434                                             enum irq_domain_bus_token bus_token)
 435 {
 436         struct irq_domain *h, *found = NULL;
 437         struct fwnode_handle *fwnode = fwspec->fwnode;
 438         int rc;
 439
 440         /* We might want to match the legacy controller last since
 441          * it might potentially be set to match all interrupts in
 442          * the absence of a device node. This isn't a problem so far
 443          * yet though...
 444          *
 445          * bus_token == DOMAIN_BUS_ANY matches any domain, any other
 446          * values must generate an exact match for the domain to be
 447          * selected.
 448          */
 449         mutex_lock(&irq_domain_mutex);
 450         list_for_each_entry(h, &irq_domain_list, link) {
 451                 if (h->ops->select && fwspec->param_count)
 452                         rc = h->ops->select(h, fwspec, bus_token);
 453                 else if (h->ops->match)
 454                         rc = h->ops->match(h, to_of_node(fwnode), bus_token);
 455                 else
 456                         rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
 457                               ((bus_token == DOMAIN_BUS_ANY) ||
 458                                (h->bus_token == bus_token)));
 459
 460                 if (rc) {
 461                         found = h;
 462                         break;
 463                 }
 464         }
 465         mutex_unlock(&irq_domain_mutex);
 466         return found;
 467 }
 468 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
 469
 470 /**
 471  * irq_set_default_host() - Set a "default" irq domain
 472  * @domain: default domain pointer
 473  *
 474  * For convenience, it's possible to set a "default" domain that will be used
 475  * whenever NULL is passed to irq_create_mapping(). It makes life easier for
 476  * platforms that want to manipulate a few hard coded interrupt numbers that
 477  * aren't properly represented in the device-tree.
 478  */
 479 void irq_set_default_host(struct irq_domain *domain)
 480 {
 481         pr_debug("Default domain set to @0x%p\n", domain);
 482
 483         irq_default_domain = domain;
 484 }
 485 EXPORT_SYMBOL_GPL(irq_set_default_host);
 486
 487 /**
 488  * irq_get_default_host() - Retrieve the "default" irq domain
 489  *
 490  * Returns: the default domain, if any.
 491  *
 492  * Modern code should never use this. This should only be used on
 493  * systems that cannot implement a firmware->fwnode mapping (which
 494  * both DT and ACPI provide).
 495  */
 496 struct irq_domain *irq_get_default_host(void)
 497 {
 498         return irq_default_domain;
 499 }
 500 EXPORT_SYMBOL_GPL(irq_get_default_host);
 501
 502 static bool irq_domain_is_nomap(struct irq_domain *domain)
 503 {
 504         return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
 505                (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
 506 }
 507
 508 static void irq_domain_clear_mapping(struct irq_domain *domain,
 509                                      irq_hw_number_t hwirq)
 510 {
 511         lockdep_assert_held(&domain->root->mutex);
 512
 513         if (irq_domain_is_nomap(domain))
 514                 return;
 515
 516         if (hwirq < domain->revmap_size)
 517                 rcu_assign_pointer(domain->revmap[hwirq], NULL);
 518         else
 519                 radix_tree_delete(&domain->revmap_tree, hwirq);
 520 }
 521
 522 static void irq_domain_set_mapping(struct irq_domain *domain,
 523                                    irq_hw_number_t hwirq,
 524                                    struct irq_data *irq_data)
 525 {
 526         /*
 527          * This also makes sure that all domains point to the same root when
 528          * called from irq_domain_insert_irq() for each domain in a hierarchy.
 529          */
 530         lockdep_assert_held(&domain->root->mutex);
 531
 532         if (irq_domain_is_nomap(domain))
 533                 return;
 534
 535         if (hwirq < domain->revmap_size)
 536                 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
 537         else
 538                 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
 539 }
 540
 541 static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
 542 {
 543         struct irq_data *irq_data = irq_get_irq_data(irq);
 544         irq_hw_number_t hwirq;
 545
 546         if (WARN(!irq_data || irq_data->domain != domain,
 547                  "virq%i doesn't exist; cannot disassociate\n", irq))
 548                 return;
 549
 550         hwirq = irq_data->hwirq;
 551
 552         mutex_lock(&domain->root->mutex);
 553
 554         irq_set_status_flags(irq, IRQ_NOREQUEST);
 555
 556         /* remove chip and handler */
 557         irq_set_chip_and_handler(irq, NULL, NULL);
 558
 559         /* Make sure it's completed */
 560         synchronize_irq(irq);
 561
 562         /* Tell the PIC about it */
 563         if (domain->ops->unmap)
 564                 domain->ops->unmap(domain, irq);
 565         smp_mb();
 566
 567         irq_data->domain = NULL;
 568         irq_data->hwirq = 0;
 569         domain->mapcount--;
 570
 571         /* Clear reverse map for this hwirq */
 572         irq_domain_clear_mapping(domain, hwirq);
 573
 574         mutex_unlock(&domain->root->mutex);
 575 }
 576
 577 static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
 578                                        irq_hw_number_t hwirq)
 579 {
 580         struct irq_data *irq_data = irq_get_irq_data(virq);
 581         int ret;
 582
 583         if (WARN(hwirq >= domain->hwirq_max,
 584                  "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
 585                 return -EINVAL;
 586         if (WARN(!irq_data, "error: virq%i is not allocated", virq))
 587                 return -EINVAL;
 588         if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
 589                 return -EINVAL;
 590
 591         irq_data->hwirq = hwirq;
 592         irq_data->domain = domain;
 593         if (domain->ops->map) {
 594                 ret = domain->ops->map(domain, virq, hwirq);
 595                 if (ret != 0) {
 596                         /*
 597                          * If map() returns -EPERM, this interrupt is protected
 598                          * by the firmware or some other service and shall not
 599                          * be mapped. Don't bother telling the user about it.
 600                          */
 601                         if (ret != -EPERM) {
 602                                 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
 603                                        domain->name, hwirq, virq, ret);
 604                         }
 605                         irq_data->domain = NULL;
 606                         irq_data->hwirq = 0;
 607                         return ret;
 608                 }
 609         }
 610
 611         domain->mapcount++;
 612         irq_domain_set_mapping(domain, hwirq, irq_data);
 613
 614         irq_clear_status_flags(virq, IRQ_NOREQUEST);
 615
 616         return 0;
 617 }
 618
 619 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
 620                          irq_hw_number_t hwirq)
 621 {
 622         int ret;
 623
 624         mutex_lock(&domain->root->mutex);
 625         ret = irq_domain_associate_locked(domain, virq, hwirq);
 626         mutex_unlock(&domain->root->mutex);
 627
 628         return ret;
 629 }
 630 EXPORT_SYMBOL_GPL(irq_domain_associate);
 631
 632 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 633                                irq_hw_number_t hwirq_base, int count)
 634 {
 635         struct device_node *of_node;
 636         int i;
 637
 638         of_node = irq_domain_get_of_node(domain);
 639         pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
 640                 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
 641
 642         for (i = 0; i < count; i++)
 643                 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
 644 }
 645 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
 646
 647 #ifdef CONFIG_IRQ_DOMAIN_NOMAP
 648 /**
 649  * irq_create_direct_mapping() - Allocate an irq for direct mapping
 650  * @domain: domain to allocate the irq for or NULL for default domain
 651  *
 652  * This routine is used for irq controllers which can choose the hardware
 653  * interrupt numbers they generate. In such a case it's simplest to use
 654  * the linux irq as the hardware interrupt number. It still uses the linear
 655  * or radix tree to store the mapping, but the irq controller can optimize
 656  * the revmap path by using the hwirq directly.
 657  */
 658 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 659 {
 660         struct device_node *of_node;
 661         unsigned int virq;
 662
 663         if (domain == NULL)
 664                 domain = irq_default_domain;
 665
 666         of_node = irq_domain_get_of_node(domain);
 667         virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
 668         if (!virq) {
 669                 pr_debug("create_direct virq allocation failed\n");
 670                 return 0;
 671         }
 672         if (virq >= domain->hwirq_max) {
 673                 pr_err("ERROR: no free irqs available below %lu maximum\n",
 674                         domain->hwirq_max);
 675                 irq_free_desc(virq);
 676                 return 0;
 677         }
 678         pr_debug("create_direct obtained virq %d\n", virq);
 679
 680         if (irq_domain_associate(domain, virq, virq)) {
 681                 irq_free_desc(virq);
 682                 return 0;
 683         }
 684
 685         return virq;
 686 }
 687 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
 688 #endif
 689
 690 static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
 691                                                        irq_hw_number_t hwirq,
 692                                                        const struct irq_affinity_desc *affinity)
 693 {
 694         struct device_node *of_node = irq_domain_get_of_node(domain);
 695         int virq;
 696
 697         pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
 698
 699         /* Allocate a virtual interrupt number */
 700         virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
 701                                       affinity);
 702         if (virq <= 0) {
 703                 pr_debug("-> virq allocation failed\n");
 704                 return 0;
 705         }
 706
 707         if (irq_domain_associate_locked(domain, virq, hwirq)) {
 708                 irq_free_desc(virq);
 709                 return 0;
 710         }
 711
 712         pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
 713                 hwirq, of_node_full_name(of_node), virq);
 714
 715         return virq;
 716 }
 717
 718 /**
 719  * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
 720  * @domain: domain owning this hardware interrupt or NULL for default domain
 721  * @hwirq: hardware irq number in that domain space
 722  * @affinity: irq affinity
 723  *
 724  * Only one mapping per hardware interrupt is permitted. Returns a linux
 725  * irq number.
 726  * If the sense/trigger is to be specified, set_irq_type() should be called
 727  * on the number returned from that call.
 728  */
 729 unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
 730                                          irq_hw_number_t hwirq,
 731                                          const struct irq_affinity_desc *affinity)
 732 {
 733         int virq;
 734
 735         /* Look for default domain if necessary */
 736         if (domain == NULL)
 737                 domain = irq_default_domain;
 738         if (domain == NULL) {
 739                 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
 740                 return 0;
 741         }
 742
 743         mutex_lock(&domain->root->mutex);
 744
 745         /* Check if mapping already exists */
 746         virq = irq_find_mapping(domain, hwirq);
 747         if (virq) {
 748                 pr_debug("existing mapping on virq %d\n", virq);
 749                 goto out;
 750         }
 751
 752         virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
 753 out:
 754         mutex_unlock(&domain->root->mutex);
 755
 756         return virq;
 757 }
 758 EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
 759
 760 static int irq_domain_translate(struct irq_domain *d,
 761                                 struct irq_fwspec *fwspec,
 762                                 irq_hw_number_t *hwirq, unsigned int *type)
 763 {
 764 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 765         if (d->ops->translate)
 766                 return d->ops->translate(d, fwspec, hwirq, type);
 767 #endif
 768         if (d->ops->xlate)
 769                 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
 770                                      fwspec->param, fwspec->param_count,
 771                                      hwirq, type);
 772
 773         /* If domain has no translation, then we assume interrupt line */
 774         *hwirq = fwspec->param[0];
 775         return 0;
 776 }
 777
 778 void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
 779                                unsigned int count, struct irq_fwspec *fwspec)
 780 {
 781         int i;
 782
 783         fwspec->fwnode = of_node_to_fwnode(np);
 784         fwspec->param_count = count;
 785
 786         for (i = 0; i < count; i++)
 787                 fwspec->param[i] = args[i];
 788 }
 789 EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
 790
 791 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
 792 {
 793         struct irq_domain *domain;
 794         struct irq_data *irq_data;
 795         irq_hw_number_t hwirq;
 796         unsigned int type = IRQ_TYPE_NONE;
 797         int virq;
 798
 799         if (fwspec->fwnode) {
 800                 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
 801                 if (!domain)
 802                         domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
 803         } else {
 804                 domain = irq_default_domain;
 805         }
 806
 807         if (!domain) {
 808                 pr_warn("no irq domain found for %s !\n",
 809                         of_node_full_name(to_of_node(fwspec->fwnode)));
 810                 return 0;
 811         }
 812
 813         if (irq_domain_translate(domain, fwspec, &hwirq, &type))
 814                 return 0;
 815
 816         /*
 817          * WARN if the irqchip returns a type with bits
 818          * outside the sense mask set and clear these bits.
 819          */
 820         if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
 821                 type &= IRQ_TYPE_SENSE_MASK;
 822
 823         mutex_lock(&domain->root->mutex);
 824
 825         /*
 826          * If we've already configured this interrupt,
 827          * don't do it again, or hell will break loose.
 828          */
 829         virq = irq_find_mapping(domain, hwirq);
 830         if (virq) {
 831                 /*
 832                  * If the trigger type is not specified or matches the
 833                  * current trigger type then we are done so return the
 834                  * interrupt number.
 835                  */
 836                 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
 837                         goto out;
 838
 839                 /*
 840                  * If the trigger type has not been set yet, then set
 841                  * it now and return the interrupt number.
 842                  */
 843                 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
 844                         irq_data = irq_get_irq_data(virq);
 845                         if (!irq_data) {
 846                                 virq = 0;
 847                                 goto out;
 848                         }
 849
 850                         irqd_set_trigger_type(irq_data, type);
 851                         goto out;
 852                 }
 853
 854                 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
 855                         hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
 856                 virq = 0;
 857                 goto out;
 858         }
 859
 860         if (irq_domain_is_hierarchy(domain)) {
 861                 virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
 862                                                     fwspec, false, NULL);
 863                 if (virq <= 0) {
 864                         virq = 0;
 865                         goto out;
 866                 }
 867         } else {
 868                 /* Create mapping */
 869                 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
 870                 if (!virq)
 871                         goto out;
 872         }
 873
 874         irq_data = irq_get_irq_data(virq);
 875         if (WARN_ON(!irq_data)) {
 876                 virq = 0;
 877                 goto out;
 878         }
 879
 880         /* Store trigger type */
 881         irqd_set_trigger_type(irq_data, type);
 882 out:
 883         mutex_unlock(&domain->root->mutex);
 884
 885         return virq;
 886 }
 887 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
 888
 889 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
 890 {
 891         struct irq_fwspec fwspec;
 892
 893         of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
 894                                   irq_data->args_count, &fwspec);
 895
 896         return irq_create_fwspec_mapping(&fwspec);
 897 }
 898 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 899
 900 /**
 901  * irq_dispose_mapping() - Unmap an interrupt
 902  * @virq: linux irq number of the interrupt to unmap
 903  */
 904 void irq_dispose_mapping(unsigned int virq)
 905 {
 906         struct irq_data *irq_data = irq_get_irq_data(virq);
 907         struct irq_domain *domain;
 908
 909         if (!virq || !irq_data)
 910                 return;
 911
 912         domain = irq_data->domain;
 913         if (WARN_ON(domain == NULL))
 914                 return;
 915
 916         if (irq_domain_is_hierarchy(domain)) {
 917                 irq_domain_free_irqs(virq, 1);
 918         } else {
 919                 irq_domain_disassociate(domain, virq);
 920                 irq_free_desc(virq);
 921         }
 922 }
 923 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 924
 925 /**
 926  * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
 927  * @domain: domain owning this hardware interrupt
 928  * @hwirq: hardware irq number in that domain space
 929  * @irq: optional pointer to return the Linux irq if required
 930  *
 931  * Returns the interrupt descriptor.
 932  */
 933 struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
 934                                        irq_hw_number_t hwirq,
 935                                        unsigned int *irq)
 936 {
 937         struct irq_desc *desc = NULL;
 938         struct irq_data *data;
 939
 940         /* Look for default domain if necessary */
 941         if (domain == NULL)
 942                 domain = irq_default_domain;
 943         if (domain == NULL)
 944                 return desc;
 945
 946         if (irq_domain_is_nomap(domain)) {
 947                 if (hwirq < domain->hwirq_max) {
 948                         data = irq_domain_get_irq_data(domain, hwirq);
 949                         if (data && data->hwirq == hwirq)
 950                                 desc = irq_data_to_desc(data);
 951                         if (irq && desc)
 952                                 *irq = hwirq;
 953                 }
 954
 955                 return desc;
 956         }
 957
 958         rcu_read_lock();
 959         /* Check if the hwirq is in the linear revmap. */
 960         if (hwirq < domain->revmap_size)
 961                 data = rcu_dereference(domain->revmap[hwirq]);
 962         else
 963                 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
 964
 965         if (likely(data)) {
 966                 desc = irq_data_to_desc(data);
 967                 if (irq)
 968                         *irq = data->irq;
 969         }
 970
 971         rcu_read_unlock();
 972         return desc;
 973 }
 974 EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
 975
 976 /**
 977  * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
 978  *
 979  * Device Tree IRQ specifier translation function which works with one cell
 980  * bindings where the cell value maps directly to the hwirq number.
 981  */
 982 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
 983                              const u32 *intspec, unsigned int intsize,
 984                              unsigned long *out_hwirq, unsigned int *out_type)
 985 {
 986         if (WARN_ON(intsize < 1))
 987                 return -EINVAL;
 988         *out_hwirq = intspec[0];
 989         *out_type = IRQ_TYPE_NONE;
 990         return 0;
 991 }
 992 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
 993
 994 /**
 995  * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
 996  *
 997  * Device Tree IRQ specifier translation function which works with two cell
 998  * bindings where the cell values map directly to the hwirq number
 999  * and linux irq flags.
1000  */
1001 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1002                         const u32 *intspec, unsigned int intsize,
1003                         irq_hw_number_t *out_hwirq, unsigned int *out_type)
1004 {
1005         struct irq_fwspec fwspec;
1006
1007         of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1008         return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1009 }
1010 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1011
1012 /**
1013  * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1014  *
1015  * Device Tree IRQ specifier translation function which works with either one
1016  * or two cell bindings where the cell values map directly to the hwirq number
1017  * and linux irq flags.
1018  *
1019  * Note: don't use this function unless your interrupt controller explicitly
1020  * supports both one and two cell bindings.  For the majority of controllers
1021  * the _onecell() or _twocell() variants above should be used.
1022  */
1023 int irq_domain_xlate_onetwocell(struct irq_domain *d,
1024                                 struct device_node *ctrlr,
1025                                 const u32 *intspec, unsigned int intsize,
1026                                 unsigned long *out_hwirq, unsigned int *out_type)
1027 {
1028         if (WARN_ON(intsize < 1))
1029                 return -EINVAL;
1030         *out_hwirq = intspec[0];
1031         if (intsize > 1)
1032                 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1033         else
1034                 *out_type = IRQ_TYPE_NONE;
1035         return 0;
1036 }
1037 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1038
1039 const struct irq_domain_ops irq_domain_simple_ops = {
1040         .xlate = irq_domain_xlate_onetwocell,
1041 };
1042 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1043
1044 /**
1045  * irq_domain_translate_onecell() - Generic translate for direct one cell
1046  * bindings
1047  */
1048 int irq_domain_translate_onecell(struct irq_domain *d,
1049                                  struct irq_fwspec *fwspec,
1050                                  unsigned long *out_hwirq,
1051                                  unsigned int *out_type)
1052 {
1053         if (WARN_ON(fwspec->param_count < 1))
1054                 return -EINVAL;
1055         *out_hwirq = fwspec->param[0];
1056         *out_type = IRQ_TYPE_NONE;
1057         return 0;
1058 }
1059 EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1060
1061 /**
1062  * irq_domain_translate_twocell() - Generic translate for direct two cell
1063  * bindings
1064  *
1065  * Device Tree IRQ specifier translation function which works with two cell
1066  * bindings where the cell values map directly to the hwirq number
1067  * and linux irq flags.
1068  */
1069 int irq_domain_translate_twocell(struct irq_domain *d,
1070                                  struct irq_fwspec *fwspec,
1071                                  unsigned long *out_hwirq,
1072                                  unsigned int *out_type)
1073 {
1074         if (WARN_ON(fwspec->param_count < 2))
1075                 return -EINVAL;
1076         *out_hwirq = fwspec->param[0];
1077         *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1078         return 0;
1079 }
1080 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1081
1082 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1083                            int node, const struct irq_affinity_desc *affinity)
1084 {
1085         unsigned int hint;
1086
1087         if (virq >= 0) {
1088                 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1089                                          affinity);
1090         } else {
1091                 hint = hwirq % nr_irqs;
1092                 if (hint == 0)
1093                         hint++;
1094                 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1095                                          affinity);
1096                 if (virq <= 0 && hint > 1) {
1097                         virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1098                                                  affinity);
1099                 }
1100         }
1101
1102         return virq;
1103 }
1104
1105 /**
1106  * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1107  * @irq_data:   The pointer to irq_data
1108  */
1109 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1110 {
1111         irq_data->hwirq = 0;
1112         irq_data->chip = &no_irq_chip;
1113         irq_data->chip_data = NULL;
1114 }
1115 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1116
1117 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1118 /**
1119  * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1120  * @parent:     Parent irq domain to associate with the new domain
1121  * @flags:      Irq domain flags associated to the domain
1122  * @size:       Size of the domain. See below
1123  * @fwnode:     Optional fwnode of the interrupt controller
1124  * @ops:        Pointer to the interrupt domain callbacks
1125  * @host_data:  Controller private data pointer
1126  *
1127  * If @size is 0 a tree domain is created, otherwise a linear domain.
1128  *
1129  * If successful the parent is associated to the new domain and the
1130  * domain flags are set.
1131  * Returns pointer to IRQ domain, or NULL on failure.
1132  */
1133 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1134                                             unsigned int flags,
1135                                             unsigned int size,
1136                                             struct fwnode_handle *fwnode,
1137                                             const struct irq_domain_ops *ops,
1138                                             void *host_data)
1139 {
1140         struct irq_domain *domain;
1141
1142         if (size)
1143                 domain = __irq_domain_create(fwnode, size, size, 0, ops, host_data);
1144         else
1145                 domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
1146
1147         if (domain) {
1148                 if (parent)
1149                         domain->root = parent->root;
1150                 domain->parent = parent;
1151                 domain->flags |= flags;
1152
1153                 __irq_domain_publish(domain);
1154         }
1155
1156         return domain;
1157 }
1158 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1159
1160 static void irq_domain_insert_irq(int virq)
1161 {
1162         struct irq_data *data;
1163
1164         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1165                 struct irq_domain *domain = data->domain;
1166
1167                 domain->mapcount++;
1168                 irq_domain_set_mapping(domain, data->hwirq, data);
1169         }
1170
1171         irq_clear_status_flags(virq, IRQ_NOREQUEST);
1172 }
1173
1174 static void irq_domain_remove_irq(int virq)
1175 {
1176         struct irq_data *data;
1177
1178         irq_set_status_flags(virq, IRQ_NOREQUEST);
1179         irq_set_chip_and_handler(virq, NULL, NULL);
1180         synchronize_irq(virq);
1181         smp_mb();
1182
1183         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1184                 struct irq_domain *domain = data->domain;
1185                 irq_hw_number_t hwirq = data->hwirq;
1186
1187                 domain->mapcount--;
1188                 irq_domain_clear_mapping(domain, hwirq);
1189         }
1190 }
1191
1192 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1193                                                    struct irq_data *child)
1194 {
1195         struct irq_data *irq_data;
1196
1197         irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1198                                 irq_data_get_node(child));
1199         if (irq_data) {
1200                 child->parent_data = irq_data;
1201                 irq_data->irq = child->irq;
1202                 irq_data->common = child->common;
1203                 irq_data->domain = domain;
1204         }
1205
1206         return irq_data;
1207 }
1208
1209 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1210 {
1211         struct irq_data *tmp;
1212
1213         while (irq_data) {
1214                 tmp = irq_data;
1215                 irq_data = irq_data->parent_data;
1216                 kfree(tmp);
1217         }
1218 }
1219
1220 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1221 {
1222         struct irq_data *irq_data, *tmp;
1223         int i;
1224
1225         for (i = 0; i < nr_irqs; i++) {
1226                 irq_data = irq_get_irq_data(virq + i);
1227                 tmp = irq_data->parent_data;
1228                 irq_data->parent_data = NULL;
1229                 irq_data->domain = NULL;
1230
1231                 __irq_domain_free_hierarchy(tmp);
1232         }
1233 }
1234
1235 /**
1236  * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1237  * @domain:     IRQ domain from which the hierarchy is to be disconnected
1238  * @virq:       IRQ number where the hierarchy is to be trimmed
1239  *
1240  * Marks the @virq level belonging to @domain as disconnected.
1241  * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1242  * to @domain.
1243  *
1244  * Its only use is to be able to trim levels of hierarchy that do not
1245  * have any real meaning for this interrupt, and that the driver marks
1246  * as such from its .alloc() callback.
1247  */
1248 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1249                                     unsigned int virq)
1250 {
1251         struct irq_data *irqd;
1252
1253         irqd = irq_domain_get_irq_data(domain, virq);
1254         if (!irqd)
1255                 return -EINVAL;
1256
1257         irqd->chip = ERR_PTR(-ENOTCONN);
1258         return 0;
1259 }
1260 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1261
1262 static int irq_domain_trim_hierarchy(unsigned int virq)
1263 {
1264         struct irq_data *tail, *irqd, *irq_data;
1265
1266         irq_data = irq_get_irq_data(virq);
1267         tail = NULL;
1268
1269         /* The first entry must have a valid irqchip */
1270         if (!irq_data->chip || IS_ERR(irq_data->chip))
1271                 return -EINVAL;
1272
1273         /*
1274          * Validate that the irq_data chain is sane in the presence of
1275          * a hierarchy trimming marker.
1276          */
1277         for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1278                 /* Can't have a valid irqchip after a trim marker */
1279                 if (irqd->chip && tail)
1280                         return -EINVAL;
1281
1282                 /* Can't have an empty irqchip before a trim marker */
1283                 if (!irqd->chip && !tail)
1284                         return -EINVAL;
1285
1286                 if (IS_ERR(irqd->chip)) {
1287                         /* Only -ENOTCONN is a valid trim marker */
1288                         if (PTR_ERR(irqd->chip) != -ENOTCONN)
1289                                 return -EINVAL;
1290
1291                         tail = irq_data;
1292                 }
1293         }
1294
1295         /* No trim marker, nothing to do */
1296         if (!tail)
1297                 return 0;
1298
1299         pr_info("IRQ%d: trimming hierarchy from %s\n",
1300                 virq, tail->parent_data->domain->name);
1301
1302         /* Sever the inner part of the hierarchy...  */
1303         irqd = tail;
1304         tail = tail->parent_data;
1305         irqd->parent_data = NULL;
1306         __irq_domain_free_hierarchy(tail);
1307
1308         return 0;
1309 }
1310
1311 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1312                                      unsigned int virq, unsigned int nr_irqs)
1313 {
1314         struct irq_data *irq_data;
1315         struct irq_domain *parent;
1316         int i;
1317
1318         /* The outermost irq_data is embedded in struct irq_desc */
1319         for (i = 0; i < nr_irqs; i++) {
1320                 irq_data = irq_get_irq_data(virq + i);
1321                 irq_data->domain = domain;
1322
1323                 for (parent = domain->parent; parent; parent = parent->parent) {
1324                         irq_data = irq_domain_insert_irq_data(parent, irq_data);
1325                         if (!irq_data) {
1326                                 irq_domain_free_irq_data(virq, i + 1);
1327                                 return -ENOMEM;
1328                         }
1329                 }
1330         }
1331
1332         return 0;
1333 }
1334
1335 /**
1336  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1337  * @domain:     domain to match
1338  * @virq:       IRQ number to get irq_data
1339  */
1340 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1341                                          unsigned int virq)
1342 {
1343         struct irq_data *irq_data;
1344
1345         for (irq_data = irq_get_irq_data(virq); irq_data;
1346              irq_data = irq_data->parent_data)
1347                 if (irq_data->domain == domain)
1348                         return irq_data;
1349
1350         return NULL;
1351 }
1352 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1353
1354 /**
1355  * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1356  * @domain:     Interrupt domain to match
1357  * @virq:       IRQ number
1358  * @hwirq:      The hwirq number
1359  * @chip:       The associated interrupt chip
1360  * @chip_data:  The associated chip data
1361  */
1362 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1363                                   irq_hw_number_t hwirq,
1364                                   const struct irq_chip *chip,
1365                                   void *chip_data)
1366 {
1367         struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1368
1369         if (!irq_data)
1370                 return -ENOENT;
1371
1372         irq_data->hwirq = hwirq;
1373         irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1374         irq_data->chip_data = chip_data;
1375
1376         return 0;
1377 }
1378 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1379
1380 /**
1381  * irq_domain_set_info - Set the complete data for a @virq in @domain
1382  * @domain:             Interrupt domain to match
1383  * @virq:               IRQ number
1384  * @hwirq:              The hardware interrupt number
1385  * @chip:               The associated interrupt chip
1386  * @chip_data:          The associated interrupt chip data
1387  * @handler:            The interrupt flow handler
1388  * @handler_data:       The interrupt flow handler data
1389  * @handler_name:       The interrupt handler name
1390  */
1391 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1392                          irq_hw_number_t hwirq, const struct irq_chip *chip,
1393                          void *chip_data, irq_flow_handler_t handler,
1394                          void *handler_data, const char *handler_name)
1395 {
1396         irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1397         __irq_set_handler(virq, handler, 0, handler_name);
1398         irq_set_handler_data(virq, handler_data);
1399 }
1400 EXPORT_SYMBOL(irq_domain_set_info);
1401
1402 /**
1403  * irq_domain_free_irqs_common - Clear irq_data and free the parent
1404  * @domain:     Interrupt domain to match
1405  * @virq:       IRQ number to start with
1406  * @nr_irqs:    The number of irqs to free
1407  */
1408 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1409                                  unsigned int nr_irqs)
1410 {
1411         struct irq_data *irq_data;
1412         int i;
1413
1414         for (i = 0; i < nr_irqs; i++) {
1415                 irq_data = irq_domain_get_irq_data(domain, virq + i);
1416                 if (irq_data)
1417                         irq_domain_reset_irq_data(irq_data);
1418         }
1419         irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1420 }
1421 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1422
1423 /**
1424  * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1425  * @domain:     Interrupt domain to match
1426  * @virq:       IRQ number to start with
1427  * @nr_irqs:    The number of irqs to free
1428  */
1429 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1430                               unsigned int nr_irqs)
1431 {
1432         int i;
1433
1434         for (i = 0; i < nr_irqs; i++) {
1435                 irq_set_handler_data(virq + i, NULL);
1436                 irq_set_handler(virq + i, NULL);
1437         }
1438         irq_domain_free_irqs_common(domain, virq, nr_irqs);
1439 }
1440
1441 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1442                                            unsigned int irq_base,
1443                                            unsigned int nr_irqs)
1444 {
1445         unsigned int i;
1446
1447         if (!domain->ops->free)
1448                 return;
1449
1450         for (i = 0; i < nr_irqs; i++) {
1451                 if (irq_domain_get_irq_data(domain, irq_base + i))
1452                         domain->ops->free(domain, irq_base + i, 1);
1453         }
1454 }
1455
1456 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1457                                     unsigned int irq_base,
1458                                     unsigned int nr_irqs, void *arg)
1459 {
1460         if (!domain->ops->alloc) {
1461                 pr_debug("domain->ops->alloc() is NULL\n");
1462                 return -ENOSYS;
1463         }
1464
1465         return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1466 }
1467
1468 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1469                                         unsigned int nr_irqs, int node, void *arg,
1470                                         bool realloc, const struct irq_affinity_desc *affinity)
1471 {
1472         int i, ret, virq;
1473
1474         if (realloc && irq_base >= 0) {
1475                 virq = irq_base;
1476         } else {
1477                 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1478                                               affinity);
1479                 if (virq < 0) {
1480                         pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1481                                  irq_base, nr_irqs);
1482                         return virq;
1483                 }
1484         }
1485
1486         if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1487                 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1488                 ret = -ENOMEM;
1489                 goto out_free_desc;
1490         }
1491
1492         ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1493         if (ret < 0)
1494                 goto out_free_irq_data;
1495
1496         for (i = 0; i < nr_irqs; i++) {
1497                 ret = irq_domain_trim_hierarchy(virq + i);
1498                 if (ret)
1499                         goto out_free_irq_data;
1500         }
1501
1502         for (i = 0; i < nr_irqs; i++)
1503                 irq_domain_insert_irq(virq + i);
1504
1505         return virq;
1506
1507 out_free_irq_data:
1508         irq_domain_free_irq_data(virq, nr_irqs);
1509 out_free_desc:
1510         irq_free_descs(virq, nr_irqs);
1511         return ret;
1512 }
1513
1514 /**
1515  * __irq_domain_alloc_irqs - Allocate IRQs from domain
1516  * @domain:     domain to allocate from
1517  * @irq_base:   allocate specified IRQ number if irq_base >= 0
1518  * @nr_irqs:    number of IRQs to allocate
1519  * @node:       NUMA node id for memory allocation
1520  * @arg:        domain specific argument
1521  * @realloc:    IRQ descriptors have already been allocated if true
1522  * @affinity:   Optional irq affinity mask for multiqueue devices
1523  *
1524  * Allocate IRQ numbers and initialized all data structures to support
1525  * hierarchy IRQ domains.
1526  * Parameter @realloc is mainly to support legacy IRQs.
1527  * Returns error code or allocated IRQ number
1528  *
1529  * The whole process to setup an IRQ has been split into two steps.
1530  * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1531  * descriptor and required hardware resources. The second step,
1532  * irq_domain_activate_irq(), is to program the hardware with preallocated
1533  * resources. In this way, it's easier to rollback when failing to
1534  * allocate resources.
1535  */
1536 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1537                             unsigned int nr_irqs, int node, void *arg,
1538                             bool realloc, const struct irq_affinity_desc *affinity)
1539 {
1540         int ret;
1541
1542         if (domain == NULL) {
1543                 domain = irq_default_domain;
1544                 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1545                         return -EINVAL;
1546         }
1547
1548         mutex_lock(&domain->root->mutex);
1549         ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1550                                            realloc, affinity);
1551         mutex_unlock(&domain->root->mutex);
1552
1553         return ret;
1554 }
1555 EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1556
1557 /* The irq_data was moved, fix the revmap to refer to the new location */
1558 static void irq_domain_fix_revmap(struct irq_data *d)
1559 {
1560         void __rcu **slot;
1561
1562         lockdep_assert_held(&d->domain->root->mutex);
1563
1564         if (irq_domain_is_nomap(d->domain))
1565                 return;
1566
1567         /* Fix up the revmap. */
1568         if (d->hwirq < d->domain->revmap_size) {
1569                 /* Not using radix tree */
1570                 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1571         } else {
1572                 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1573                 if (slot)
1574                         radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1575         }
1576 }
1577
1578 /**
1579  * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1580  * @domain:     Domain to push.
1581  * @virq:       Irq to push the domain in to.
1582  * @arg:        Passed to the irq_domain_ops alloc() function.
1583  *
1584  * For an already existing irqdomain hierarchy, as might be obtained
1585  * via a call to pci_enable_msix(), add an additional domain to the
1586  * head of the processing chain.  Must be called before request_irq()
1587  * has been called.
1588  */
1589 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1590 {
1591         struct irq_data *irq_data = irq_get_irq_data(virq);
1592         struct irq_data *parent_irq_data;
1593         struct irq_desc *desc;
1594         int rv = 0;
1595
1596         /*
1597          * Check that no action has been set, which indicates the virq
1598          * is in a state where this function doesn't have to deal with
1599          * races between interrupt handling and maintaining the
1600          * hierarchy.  This will catch gross misuse.  Attempting to
1601          * make the check race free would require holding locks across
1602          * calls to struct irq_domain_ops->alloc(), which could lead
1603          * to deadlock, so we just do a simple check before starting.
1604          */
1605         desc = irq_to_desc(virq);
1606         if (!desc)
1607                 return -EINVAL;
1608         if (WARN_ON(desc->action))
1609                 return -EBUSY;
1610
1611         if (domain == NULL)
1612                 return -EINVAL;
1613
1614         if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1615                 return -EINVAL;
1616
1617         if (!irq_data)
1618                 return -EINVAL;
1619
1620         if (domain->parent != irq_data->domain)
1621                 return -EINVAL;
1622
1623         parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1624                                        irq_data_get_node(irq_data));
1625         if (!parent_irq_data)
1626                 return -ENOMEM;
1627
1628         mutex_lock(&domain->root->mutex);
1629
1630         /* Copy the original irq_data. */
1631         *parent_irq_data = *irq_data;
1632
1633         /*
1634          * Overwrite the irq_data, which is embedded in struct irq_desc, with
1635          * values for this domain.
1636          */
1637         irq_data->parent_data = parent_irq_data;
1638         irq_data->domain = domain;
1639         irq_data->mask = 0;
1640         irq_data->hwirq = 0;
1641         irq_data->chip = NULL;
1642         irq_data->chip_data = NULL;
1643
1644         /* May (probably does) set hwirq, chip, etc. */
1645         rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1646         if (rv) {
1647                 /* Restore the original irq_data. */
1648                 *irq_data = *parent_irq_data;
1649                 kfree(parent_irq_data);
1650                 goto error;
1651         }
1652
1653         irq_domain_fix_revmap(parent_irq_data);
1654         irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
1655 error:
1656         mutex_unlock(&domain->root->mutex);
1657
1658         return rv;
1659 }
1660 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1661
1662 /**
1663  * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1664  * @domain:     Domain to remove.
1665  * @virq:       Irq to remove the domain from.
1666  *
1667  * Undo the effects of a call to irq_domain_push_irq().  Must be
1668  * called either before request_irq() or after free_irq().
1669  */
1670 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1671 {
1672         struct irq_data *irq_data = irq_get_irq_data(virq);
1673         struct irq_data *parent_irq_data;
1674         struct irq_data *tmp_irq_data;
1675         struct irq_desc *desc;
1676
1677         /*
1678          * Check that no action is set, which indicates the virq is in
1679          * a state where this function doesn't have to deal with races
1680          * between interrupt handling and maintaining the hierarchy.
1681          * This will catch gross misuse.  Attempting to make the check
1682          * race free would require holding locks across calls to
1683          * struct irq_domain_ops->free(), which could lead to
1684          * deadlock, so we just do a simple check before starting.
1685          */
1686         desc = irq_to_desc(virq);
1687         if (!desc)
1688                 return -EINVAL;
1689         if (WARN_ON(desc->action))
1690                 return -EBUSY;
1691
1692         if (domain == NULL)
1693                 return -EINVAL;
1694
1695         if (!irq_data)
1696                 return -EINVAL;
1697
1698         tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1699
1700         /* We can only "pop" if this domain is at the top of the list */
1701         if (WARN_ON(irq_data != tmp_irq_data))
1702                 return -EINVAL;
1703
1704         if (WARN_ON(irq_data->domain != domain))
1705                 return -EINVAL;
1706
1707         parent_irq_data = irq_data->parent_data;
1708         if (WARN_ON(!parent_irq_data))
1709                 return -EINVAL;
1710
1711         mutex_lock(&domain->root->mutex);
1712
1713         irq_data->parent_data = NULL;
1714
1715         irq_domain_clear_mapping(domain, irq_data->hwirq);
1716         irq_domain_free_irqs_hierarchy(domain, virq, 1);
1717
1718         /* Restore the original irq_data. */
1719         *irq_data = *parent_irq_data;
1720
1721         irq_domain_fix_revmap(irq_data);
1722
1723         mutex_unlock(&domain->root->mutex);
1724
1725         kfree(parent_irq_data);
1726
1727         return 0;
1728 }
1729 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1730
1731 /**
1732  * irq_domain_free_irqs - Free IRQ number and associated data structures
1733  * @virq:       base IRQ number
1734  * @nr_irqs:    number of IRQs to free
1735  */
1736 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1737 {
1738         struct irq_data *data = irq_get_irq_data(virq);
1739         struct irq_domain *domain;
1740         int i;
1741
1742         if (WARN(!data || !data->domain || !data->domain->ops->free,
1743                  "NULL pointer, cannot free irq\n"))
1744                 return;
1745
1746         domain = data->domain;
1747
1748         mutex_lock(&domain->root->mutex);
1749         for (i = 0; i < nr_irqs; i++)
1750                 irq_domain_remove_irq(virq + i);
1751         irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
1752         mutex_unlock(&domain->root->mutex);
1753
1754         irq_domain_free_irq_data(virq, nr_irqs);
1755         irq_free_descs(virq, nr_irqs);
1756 }
1757
1758 /**
1759  * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1760  * @domain:     Domain below which interrupts must be allocated
1761  * @irq_base:   Base IRQ number
1762  * @nr_irqs:    Number of IRQs to allocate
1763  * @arg:        Allocation data (arch/domain specific)
1764  */
1765 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1766                                  unsigned int irq_base, unsigned int nr_irqs,
1767                                  void *arg)
1768 {
1769         if (!domain->parent)
1770                 return -ENOSYS;
1771
1772         return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1773                                                nr_irqs, arg);
1774 }
1775 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1776
1777 /**
1778  * irq_domain_free_irqs_parent - Free interrupts from parent domain
1779  * @domain:     Domain below which interrupts must be freed
1780  * @irq_base:   Base IRQ number
1781  * @nr_irqs:    Number of IRQs to free
1782  */
1783 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1784                                  unsigned int irq_base, unsigned int nr_irqs)
1785 {
1786         if (!domain->parent)
1787                 return;
1788
1789         irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1790 }
1791 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1792
1793 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1794 {
1795         if (irq_data && irq_data->domain) {
1796                 struct irq_domain *domain = irq_data->domain;
1797
1798                 if (domain->ops->deactivate)
1799                         domain->ops->deactivate(domain, irq_data);
1800                 if (irq_data->parent_data)
1801                         __irq_domain_deactivate_irq(irq_data->parent_data);
1802         }
1803 }
1804
1805 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1806 {
1807         int ret = 0;
1808
1809         if (irqd && irqd->domain) {
1810                 struct irq_domain *domain = irqd->domain;
1811
1812                 if (irqd->parent_data)
1813                         ret = __irq_domain_activate_irq(irqd->parent_data,
1814                                                         reserve);
1815                 if (!ret && domain->ops->activate) {
1816                         ret = domain->ops->activate(domain, irqd, reserve);
1817                         /* Rollback in case of error */
1818                         if (ret && irqd->parent_data)
1819                                 __irq_domain_deactivate_irq(irqd->parent_data);
1820                 }
1821         }
1822         return ret;
1823 }
1824
1825 /**
1826  * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1827  *                           interrupt
1828  * @irq_data:   Outermost irq_data associated with interrupt
1829  * @reserve:    If set only reserve an interrupt vector instead of assigning one
1830  *
1831  * This is the second step to call domain_ops->activate to program interrupt
1832  * controllers, so the interrupt could actually get delivered.
1833  */
1834 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1835 {
1836         int ret = 0;
1837
1838         if (!irqd_is_activated(irq_data))
1839                 ret = __irq_domain_activate_irq(irq_data, reserve);
1840         if (!ret)
1841                 irqd_set_activated(irq_data);
1842         return ret;
1843 }
1844
1845 /**
1846  * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1847  *                             deactivate interrupt
1848  * @irq_data: outermost irq_data associated with interrupt
1849  *
1850  * It calls domain_ops->deactivate to program interrupt controllers to disable
1851  * interrupt delivery.
1852  */
1853 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1854 {
1855         if (irqd_is_activated(irq_data)) {
1856                 __irq_domain_deactivate_irq(irq_data);
1857                 irqd_clr_activated(irq_data);
1858         }
1859 }
1860
1861 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1862 {
1863         /* Hierarchy irq_domains must implement callback alloc() */
1864         if (domain->ops->alloc)
1865                 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1866 }
1867 #else   /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1868 /**
1869  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1870  * @domain:     domain to match
1871  * @virq:       IRQ number to get irq_data
1872  */
1873 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1874                                          unsigned int virq)
1875 {
1876         struct irq_data *irq_data = irq_get_irq_data(virq);
1877
1878         return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1879 }
1880 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1881
1882 /**
1883  * irq_domain_set_info - Set the complete data for a @virq in @domain
1884  * @domain:             Interrupt domain to match
1885  * @virq:               IRQ number
1886  * @hwirq:              The hardware interrupt number
1887  * @chip:               The associated interrupt chip
1888  * @chip_data:          The associated interrupt chip data
1889  * @handler:            The interrupt flow handler
1890  * @handler_data:       The interrupt flow handler data
1891  * @handler_name:       The interrupt handler name
1892  */
1893 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1894                          irq_hw_number_t hwirq, const struct irq_chip *chip,
1895                          void *chip_data, irq_flow_handler_t handler,
1896                          void *handler_data, const char *handler_name)
1897 {
1898         irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1899         irq_set_chip_data(virq, chip_data);
1900         irq_set_handler_data(virq, handler_data);
1901 }
1902
1903 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1904                                         unsigned int nr_irqs, int node, void *arg,
1905                                         bool realloc, const struct irq_affinity_desc *affinity)
1906 {
1907         return -EINVAL;
1908 }
1909
1910 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1911 {
1912 }
1913 #endif  /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1914
1915 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1916 #include "internals.h"
1917
1918 static struct dentry *domain_dir;
1919
1920 static void
1921 irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1922 {
1923         seq_printf(m, "%*sname:   %s\n", ind, "", d->name);
1924         seq_printf(m, "%*ssize:   %u\n", ind + 1, "", d->revmap_size);
1925         seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1926         seq_printf(m, "%*sflags:  0x%08x\n", ind +1 , "", d->flags);
1927         if (d->ops && d->ops->debug_show)
1928                 d->ops->debug_show(m, d, NULL, ind + 1);
1929 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1930         if (!d->parent)
1931                 return;
1932         seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1933         irq_domain_debug_show_one(m, d->parent, ind + 4);
1934 #endif
1935 }
1936
1937 static int irq_domain_debug_show(struct seq_file *m, void *p)
1938 {
1939         struct irq_domain *d = m->private;
1940
1941         /* Default domain? Might be NULL */
1942         if (!d) {
1943                 if (!irq_default_domain)
1944                         return 0;
1945                 d = irq_default_domain;
1946         }
1947         irq_domain_debug_show_one(m, d, 0);
1948         return 0;
1949 }
1950 DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1951
1952 static void debugfs_add_domain_dir(struct irq_domain *d)
1953 {
1954         if (!d->name || !domain_dir)
1955                 return;
1956         debugfs_create_file(d->name, 0444, domain_dir, d,
1957                             &irq_domain_debug_fops);
1958 }
1959
1960 static void debugfs_remove_domain_dir(struct irq_domain *d)
1961 {
1962         debugfs_lookup_and_remove(d->name, domain_dir);
1963 }
1964
1965 void __init irq_domain_debugfs_init(struct dentry *root)
1966 {
1967         struct irq_domain *d;
1968
1969         domain_dir = debugfs_create_dir("domains", root);
1970
1971         debugfs_create_file("default", 0444, domain_dir, NULL,
1972                             &irq_domain_debug_fops);
1973         mutex_lock(&irq_domain_mutex);
1974         list_for_each_entry(d, &irq_domain_list, link)
1975                 debugfs_add_domain_dir(d);
1976         mutex_unlock(&irq_domain_mutex);
1977 }
1978 #endif