kernel/irq/irqdomain.c

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

DEFINITIONS
