kernel/irq/irqdomain.c

   1 #define pr_fmt(fmt)  "irq: " fmt
   2
   3 #include <linux/debugfs.h>
   4 #include <linux/hardirq.h>
   5 #include <linux/interrupt.h>
   6 #include <linux/irq.h>
   7 #include <linux/irqdesc.h>
   8 #include <linux/irqdomain.h>
   9 #include <linux/module.h>
  10 #include <linux/mutex.h>
  11 #include <linux/of.h>
  12 #include <linux/of_address.h>
  13 #include <linux/topology.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/slab.h>
  16 #include <linux/smp.h>
  17 #include <linux/fs.h>
  18
  19 #define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
  20                                  * ie. legacy 8259, gets irqs 1..15 */
  21 #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
  22 #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
  23 #define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
  24
  25 static LIST_HEAD(irq_domain_list);
  26 static DEFINE_MUTEX(irq_domain_mutex);
  27
  28 static DEFINE_MUTEX(revmap_trees_mutex);
  29 static struct irq_domain *irq_default_domain;
  30
  31 /**
  32  * irq_domain_alloc() - Allocate a new irq_domain data structure
  33  * @of_node: optional device-tree node of the interrupt controller
  34  * @revmap_type: type of reverse mapping to use
  35  * @ops: map/unmap domain callbacks
  36  * @host_data: Controller private data pointer
  37  *
  38  * Allocates and initialize and irq_domain structure.  Caller is expected to
  39  * register allocated irq_domain with irq_domain_register().  Returns pointer
  40  * to IRQ domain, or NULL on failure.
  41  */
  42 static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
  43                                            unsigned int revmap_type,
  44                                            const struct irq_domain_ops *ops,
  45                                            void *host_data)
  46 {
  47         struct irq_domain *domain;
  48
  49         domain = kzalloc_node(sizeof(*domain), GFP_KERNEL,
  50                               of_node_to_nid(of_node));
  51         if (WARN_ON(!domain))
  52                 return NULL;
  53
  54         /* Fill structure */
  55         domain->revmap_type = revmap_type;
  56         domain->ops = ops;
  57         domain->host_data = host_data;
  58         domain->of_node = of_node_get(of_node);
  59
  60         return domain;
  61 }
  62
  63 static void irq_domain_free(struct irq_domain *domain)
  64 {
  65         of_node_put(domain->of_node);
  66         kfree(domain);
  67 }
  68
  69 static void irq_domain_add(struct irq_domain *domain)
  70 {
  71         mutex_lock(&irq_domain_mutex);
  72         list_add(&domain->link, &irq_domain_list);
  73         mutex_unlock(&irq_domain_mutex);
  74         pr_debug("Allocated domain of type %d @0x%p\n",
  75                  domain->revmap_type, domain);
  76 }
  77
  78 /**
  79  * irq_domain_remove() - Remove an irq domain.
  80  * @domain: domain to remove
  81  *
  82  * This routine is used to remove an irq domain. The caller must ensure
  83  * that all mappings within the domain have been disposed of prior to
  84  * use, depending on the revmap type.
  85  */
  86 void irq_domain_remove(struct irq_domain *domain)
  87 {
  88         mutex_lock(&irq_domain_mutex);
  89
  90         switch (domain->revmap_type) {
  91         case IRQ_DOMAIN_MAP_LEGACY:
  92                 /*
  93                  * Legacy domains don't manage their own irq_desc
  94                  * allocations, we expect the caller to handle irq_desc
  95                  * freeing on their own.
  96                  */
  97                 break;
  98         case IRQ_DOMAIN_MAP_TREE:
  99                 /*
 100                  * radix_tree_delete() takes care of destroying the root
 101                  * node when all entries are removed. Shout if there are
 102                  * any mappings left.
 103                  */
 104                 WARN_ON(domain->revmap_data.tree.height);
 105                 break;
 106         case IRQ_DOMAIN_MAP_LINEAR:
 107                 kfree(domain->revmap_data.linear.revmap);
 108                 domain->revmap_data.linear.size = 0;
 109                 break;
 110         case IRQ_DOMAIN_MAP_NOMAP:
 111                 break;
 112         }
 113
 114         list_del(&domain->link);
 115
 116         /*
 117          * If the going away domain is the default one, reset it.
 118          */
 119         if (unlikely(irq_default_domain == domain))
 120                 irq_set_default_host(NULL);
 121
 122         mutex_unlock(&irq_domain_mutex);
 123
 124         pr_debug("Removed domain of type %d @0x%p\n",
 125                  domain->revmap_type, domain);
 126
 127         irq_domain_free(domain);
 128 }
 129 EXPORT_SYMBOL_GPL(irq_domain_remove);
 130
 131 static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
 132                                              irq_hw_number_t hwirq)
 133 {
 134         irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
 135         int size = domain->revmap_data.legacy.size;
 136
 137         if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
 138                 return 0;
 139         return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
 140 }
 141
 142 /**
 143  * irq_domain_add_simple() - Allocate and register a simple irq_domain.
 144  * @of_node: pointer to interrupt controller's device tree node.
 145  * @size: total number of irqs in mapping
 146  * @first_irq: first number of irq block assigned to the domain
 147  * @ops: map/unmap domain callbacks
 148  * @host_data: Controller private data pointer
 149  *
 150  * Allocates a legacy irq_domain if irq_base is positive or a linear
 151  * domain otherwise. For the legacy domain, IRQ descriptors will also
 152  * be allocated.
 153  *
 154  * This is intended to implement the expected behaviour for most
 155  * interrupt controllers which is that a linear mapping should
 156  * normally be used unless the system requires a legacy mapping in
 157  * order to support supplying interrupt numbers during non-DT
 158  * registration of devices.
 159  */
 160 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
 161                                          unsigned int size,
 162                                          unsigned int first_irq,
 163                                          const struct irq_domain_ops *ops,
 164                                          void *host_data)
 165 {
 166         if (first_irq > 0) {
 167                 int irq_base;
 168
 169                 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
 170                         /*
 171                          * Set the descriptor allocator to search for a
 172                          * 1-to-1 mapping, such as irq_alloc_desc_at().
 173                          * Use of_node_to_nid() which is defined to
 174                          * numa_node_id() on platforms that have no custom
 175                          * implementation.
 176                          */
 177                         irq_base = irq_alloc_descs(first_irq, first_irq, size,
 178                                                    of_node_to_nid(of_node));
 179                         if (irq_base < 0) {
 180                                 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
 181                                         first_irq);
 182                                 irq_base = first_irq;
 183                         }
 184                 } else
 185                         irq_base = first_irq;
 186
 187                 return irq_domain_add_legacy(of_node, size, irq_base, 0,
 188                                              ops, host_data);
 189         }
 190
 191         /* A linear domain is the default */
 192         return irq_domain_add_linear(of_node, size, ops, host_data);
 193 }
 194
 195 /**
 196  * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
 197  * @of_node: pointer to interrupt controller's device tree node.
 198  * @size: total number of irqs in legacy mapping
 199  * @first_irq: first number of irq block assigned to the domain
 200  * @first_hwirq: first hwirq number to use for the translation. Should normally
 201  *               be '0', but a positive integer can be used if the effective
 202  *               hwirqs numbering does not begin at zero.
 203  * @ops: map/unmap domain callbacks
 204  * @host_data: Controller private data pointer
 205  *
 206  * Note: the map() callback will be called before this function returns
 207  * for all legacy interrupts except 0 (which is always the invalid irq for
 208  * a legacy controller).
 209  */
 210 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 211                                          unsigned int size,
 212                                          unsigned int first_irq,
 213                                          irq_hw_number_t first_hwirq,
 214                                          const struct irq_domain_ops *ops,
 215                                          void *host_data)
 216 {
 217         struct irq_domain *domain;
 218         unsigned int i;
 219
 220         domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
 221         if (!domain)
 222                 return NULL;
 223
 224         domain->revmap_data.legacy.first_irq = first_irq;
 225         domain->revmap_data.legacy.first_hwirq = first_hwirq;
 226         domain->revmap_data.legacy.size = size;
 227
 228         mutex_lock(&irq_domain_mutex);
 229         /* Verify that all the irqs are available */
 230         for (i = 0; i < size; i++) {
 231                 int irq = first_irq + i;
 232                 struct irq_data *irq_data = irq_get_irq_data(irq);
 233
 234                 if (WARN_ON(!irq_data || irq_data->domain)) {
 235                         mutex_unlock(&irq_domain_mutex);
 236                         irq_domain_free(domain);
 237                         return NULL;
 238                 }
 239         }
 240
 241         /* Claim all of the irqs before registering a legacy domain */
 242         for (i = 0; i < size; i++) {
 243                 struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
 244                 irq_data->hwirq = first_hwirq + i;
 245                 irq_data->domain = domain;
 246         }
 247         mutex_unlock(&irq_domain_mutex);
 248
 249         for (i = 0; i < size; i++) {
 250                 int irq = first_irq + i;
 251                 int hwirq = first_hwirq + i;
 252
 253                 /* IRQ0 gets ignored */
 254                 if (!irq)
 255                         continue;
 256
 257                 /* Legacy flags are left to default at this point,
 258                  * one can then use irq_create_mapping() to
 259                  * explicitly change them
 260                  */
 261                 if (ops->map)
 262                         ops->map(domain, irq, hwirq);
 263
 264                 /* Clear norequest flags */
 265                 irq_clear_status_flags(irq, IRQ_NOREQUEST);
 266         }
 267
 268         irq_domain_add(domain);
 269         return domain;
 270 }
 271 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 272
 273 /**
 274  * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
 275  * @of_node: pointer to interrupt controller's device tree node.
 276  * @size: Number of interrupts in the domain.
 277  * @ops: map/unmap domain callbacks
 278  * @host_data: Controller private data pointer
 279  */
 280 struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
 281                                          unsigned int size,
 282                                          const struct irq_domain_ops *ops,
 283                                          void *host_data)
 284 {
 285         struct irq_domain *domain;
 286         unsigned int *revmap;
 287
 288         revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL,
 289                               of_node_to_nid(of_node));
 290         if (WARN_ON(!revmap))
 291                 return NULL;
 292
 293         domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
 294         if (!domain) {
 295                 kfree(revmap);
 296                 return NULL;
 297         }
 298         domain->revmap_data.linear.size = size;
 299         domain->revmap_data.linear.revmap = revmap;
 300         irq_domain_add(domain);
 301         return domain;
 302 }
 303 EXPORT_SYMBOL_GPL(irq_domain_add_linear);
 304
 305 struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
 306                                          unsigned int max_irq,
 307                                          const struct irq_domain_ops *ops,
 308                                          void *host_data)
 309 {
 310         struct irq_domain *domain = irq_domain_alloc(of_node,
 311                                         IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
 312         if (domain) {
 313                 domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
 314                 irq_domain_add(domain);
 315         }
 316         return domain;
 317 }
 318 EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
 319
 320 /**
 321  * irq_domain_add_tree()
 322  * @of_node: pointer to interrupt controller's device tree node.
 323  * @ops: map/unmap domain callbacks
 324  *
 325  * Note: The radix tree will be allocated later during boot automatically
 326  * (the reverse mapping will use the slow path until that happens).
 327  */
 328 struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
 329                                          const struct irq_domain_ops *ops,
 330                                          void *host_data)
 331 {
 332         struct irq_domain *domain = irq_domain_alloc(of_node,
 333                                         IRQ_DOMAIN_MAP_TREE, ops, host_data);
 334         if (domain) {
 335                 INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
 336                 irq_domain_add(domain);
 337         }
 338         return domain;
 339 }
 340 EXPORT_SYMBOL_GPL(irq_domain_add_tree);
 341
 342 /**
 343  * irq_find_host() - Locates a domain for a given device node
 344  * @node: device-tree node of the interrupt controller
 345  */
 346 struct irq_domain *irq_find_host(struct device_node *node)
 347 {
 348         struct irq_domain *h, *found = NULL;
 349         int rc;
 350
 351         /* We might want to match the legacy controller last since
 352          * it might potentially be set to match all interrupts in
 353          * the absence of a device node. This isn't a problem so far
 354          * yet though...
 355          */
 356         mutex_lock(&irq_domain_mutex);
 357         list_for_each_entry(h, &irq_domain_list, link) {
 358                 if (h->ops->match)
 359                         rc = h->ops->match(h, node);
 360                 else
 361                         rc = (h->of_node != NULL) && (h->of_node == node);
 362
 363                 if (rc) {
 364                         found = h;
 365                         break;
 366                 }
 367         }
 368         mutex_unlock(&irq_domain_mutex);
 369         return found;
 370 }
 371 EXPORT_SYMBOL_GPL(irq_find_host);
 372
 373 /**
 374  * irq_set_default_host() - Set a "default" irq domain
 375  * @domain: default domain pointer
 376  *
 377  * For convenience, it's possible to set a "default" domain that will be used
 378  * whenever NULL is passed to irq_create_mapping(). It makes life easier for
 379  * platforms that want to manipulate a few hard coded interrupt numbers that
 380  * aren't properly represented in the device-tree.
 381  */
 382 void irq_set_default_host(struct irq_domain *domain)
 383 {
 384         pr_debug("Default domain set to @0x%p\n", domain);
 385
 386         irq_default_domain = domain;
 387 }
 388 EXPORT_SYMBOL_GPL(irq_set_default_host);
 389
 390 static void irq_domain_disassociate_many(struct irq_domain *domain,
 391                                          unsigned int irq_base, int count)
 392 {
 393         /*
 394          * disassociate in reverse order;
 395          * not strictly necessary, but nice for unwinding
 396          */
 397         while (count--) {
 398                 int irq = irq_base + count;
 399                 struct irq_data *irq_data = irq_get_irq_data(irq);
 400                 irq_hw_number_t hwirq = irq_data->hwirq;
 401
 402                 if (WARN_ON(!irq_data || irq_data->domain != domain))
 403                         continue;
 404
 405                 irq_set_status_flags(irq, IRQ_NOREQUEST);
 406
 407                 /* remove chip and handler */
 408                 irq_set_chip_and_handler(irq, NULL, NULL);
 409
 410                 /* Make sure it's completed */
 411                 synchronize_irq(irq);
 412
 413                 /* Tell the PIC about it */
 414                 if (domain->ops->unmap)
 415                         domain->ops->unmap(domain, irq);
 416                 smp_mb();
 417
 418                 irq_data->domain = NULL;
 419                 irq_data->hwirq = 0;
 420
 421                 /* Clear reverse map */
 422                 switch(domain->revmap_type) {
 423                 case IRQ_DOMAIN_MAP_LINEAR:
 424                         if (hwirq < domain->revmap_data.linear.size)
 425                                 domain->revmap_data.linear.revmap[hwirq] = 0;
 426                         break;
 427                 case IRQ_DOMAIN_MAP_TREE:
 428                         mutex_lock(&revmap_trees_mutex);
 429                         radix_tree_delete(&domain->revmap_data.tree, hwirq);
 430                         mutex_unlock(&revmap_trees_mutex);
 431                         break;
 432                 }
 433         }
 434 }
 435
 436 int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 437                               irq_hw_number_t hwirq_base, int count)
 438 {
 439         unsigned int virq = irq_base;
 440         irq_hw_number_t hwirq = hwirq_base;
 441         int i, ret;
 442
 443         pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
 444                 of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
 445
 446         for (i = 0; i < count; i++) {
 447                 struct irq_data *irq_data = irq_get_irq_data(virq + i);
 448
 449                 if (WARN(!irq_data, "error: irq_desc not allocated; "
 450                          "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
 451                         return -EINVAL;
 452                 if (WARN(irq_data->domain, "error: irq_desc already associated; "
 453                          "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
 454                         return -EINVAL;
 455         };
 456
 457         for (i = 0; i < count; i++, virq++, hwirq++) {
 458                 struct irq_data *irq_data = irq_get_irq_data(virq);
 459
 460                 irq_data->hwirq = hwirq;
 461                 irq_data->domain = domain;
 462                 if (domain->ops->map) {
 463                         ret = domain->ops->map(domain, virq, hwirq);
 464                         if (ret != 0) {
 465                                 pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n",
 466                                        virq, hwirq, ret);
 467                                 WARN_ON(1);
 468                                 irq_data->domain = NULL;
 469                                 irq_data->hwirq = 0;
 470                                 goto err_unmap;
 471                         }
 472                 }
 473
 474                 switch (domain->revmap_type) {
 475                 case IRQ_DOMAIN_MAP_LINEAR:
 476                         if (hwirq < domain->revmap_data.linear.size)
 477                                 domain->revmap_data.linear.revmap[hwirq] = virq;
 478                         break;
 479                 case IRQ_DOMAIN_MAP_TREE:
 480                         mutex_lock(&revmap_trees_mutex);
 481                         radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
 482                         mutex_unlock(&revmap_trees_mutex);
 483                         break;
 484                 }
 485
 486                 irq_clear_status_flags(virq, IRQ_NOREQUEST);
 487         }
 488
 489         return 0;
 490
 491  err_unmap:
 492         irq_domain_disassociate_many(domain, irq_base, i);
 493         return -EINVAL;
 494 }
 495 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
 496
 497 /**
 498  * irq_create_direct_mapping() - Allocate an irq for direct mapping
 499  * @domain: domain to allocate the irq for or NULL for default domain
 500  *
 501  * This routine is used for irq controllers which can choose the hardware
 502  * interrupt numbers they generate. In such a case it's simplest to use
 503  * the linux irq as the hardware interrupt number.
 504  */
 505 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 506 {
 507         unsigned int virq;
 508
 509         if (domain == NULL)
 510                 domain = irq_default_domain;
 511
 512         if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP))
 513                 return 0;
 514
 515         virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
 516         if (!virq) {
 517                 pr_debug("create_direct virq allocation failed\n");
 518                 return 0;
 519         }
 520         if (virq >= domain->revmap_data.nomap.max_irq) {
 521                 pr_err("ERROR: no free irqs available below %i maximum\n",
 522                         domain->revmap_data.nomap.max_irq);
 523                 irq_free_desc(virq);
 524                 return 0;
 525         }
 526         pr_debug("create_direct obtained virq %d\n", virq);
 527
 528         if (irq_domain_associate(domain, virq, virq)) {
 529                 irq_free_desc(virq);
 530                 return 0;
 531         }
 532
 533         return virq;
 534 }
 535 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
 536
 537 /**
 538  * irq_create_mapping() - Map a hardware interrupt into linux irq space
 539  * @domain: domain owning this hardware interrupt or NULL for default domain
 540  * @hwirq: hardware irq number in that domain space
 541  *
 542  * Only one mapping per hardware interrupt is permitted. Returns a linux
 543  * irq number.
 544  * If the sense/trigger is to be specified, set_irq_type() should be called
 545  * on the number returned from that call.
 546  */
 547 unsigned int irq_create_mapping(struct irq_domain *domain,
 548                                 irq_hw_number_t hwirq)
 549 {
 550         unsigned int hint;
 551         int virq;
 552
 553         pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
 554
 555         /* Look for default domain if nececssary */
 556         if (domain == NULL)
 557                 domain = irq_default_domain;
 558         if (domain == NULL) {
 559                 pr_warning("irq_create_mapping called for"
 560                            " NULL domain, hwirq=%lx\n", hwirq);
 561                 WARN_ON(1);
 562                 return 0;
 563         }
 564         pr_debug("-> using domain @%p\n", domain);
 565
 566         /* Check if mapping already exists */
 567         virq = irq_find_mapping(domain, hwirq);
 568         if (virq) {
 569                 pr_debug("-> existing mapping on virq %d\n", virq);
 570                 return virq;
 571         }
 572
 573         /* Get a virtual interrupt number */
 574         if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
 575                 return irq_domain_legacy_revmap(domain, hwirq);
 576
 577         /* Allocate a virtual interrupt number */
 578         hint = hwirq % nr_irqs;
 579         if (hint == 0)
 580                 hint++;
 581         virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
 582         if (virq <= 0)
 583                 virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
 584         if (virq <= 0) {
 585                 pr_debug("-> virq allocation failed\n");
 586                 return 0;
 587         }
 588
 589         if (irq_domain_associate(domain, virq, hwirq)) {
 590                 irq_free_desc(virq);
 591                 return 0;
 592         }
 593
 594         pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
 595                 hwirq, of_node_full_name(domain->of_node), virq);
 596
 597         return virq;
 598 }
 599 EXPORT_SYMBOL_GPL(irq_create_mapping);
 600
 601 /**
 602  * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
 603  * @domain: domain owning the interrupt range
 604  * @irq_base: beginning of linux IRQ range
 605  * @hwirq_base: beginning of hardware IRQ range
 606  * @count: Number of interrupts to map
 607  *
 608  * This routine is used for allocating and mapping a range of hardware
 609  * irqs to linux irqs where the linux irq numbers are at pre-defined
 610  * locations. For use by controllers that already have static mappings
 611  * to insert in to the domain.
 612  *
 613  * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
 614  * domain insertion.
 615  *
 616  * 0 is returned upon success, while any failure to establish a static
 617  * mapping is treated as an error.
 618  */
 619 int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
 620                                irq_hw_number_t hwirq_base, int count)
 621 {
 622         int ret;
 623
 624         ret = irq_alloc_descs(irq_base, irq_base, count,
 625                               of_node_to_nid(domain->of_node));
 626         if (unlikely(ret < 0))
 627                 return ret;
 628
 629         ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count);
 630         if (unlikely(ret < 0)) {
 631                 irq_free_descs(irq_base, count);
 632                 return ret;
 633         }
 634
 635         return 0;
 636 }
 637 EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
 638
 639 unsigned int irq_create_of_mapping(struct device_node *controller,
 640                                    const u32 *intspec, unsigned int intsize)
 641 {
 642         struct irq_domain *domain;
 643         irq_hw_number_t hwirq;
 644         unsigned int type = IRQ_TYPE_NONE;
 645         unsigned int virq;
 646
 647         domain = controller ? irq_find_host(controller) : irq_default_domain;
 648         if (!domain) {
 649 #ifdef CONFIG_MIPS
 650                 /*
 651                  * Workaround to avoid breaking interrupt controller drivers
 652                  * that don't yet register an irq_domain.  This is temporary
 653                  * code. ~~~gcl, Feb 24, 2012
 654                  *
 655                  * Scheduled for removal in Linux v3.6.  That should be enough
 656                  * time.
 657                  */
 658                 if (intsize > 0)
 659                         return intspec[0];
 660 #endif
 661                 pr_warning("no irq domain found for %s !\n",
 662                            of_node_full_name(controller));
 663                 return 0;
 664         }
 665
 666         /* If domain has no translation, then we assume interrupt line */
 667         if (domain->ops->xlate == NULL)
 668                 hwirq = intspec[0];
 669         else {
 670                 if (domain->ops->xlate(domain, controller, intspec, intsize,
 671                                      &hwirq, &type))
 672                         return 0;
 673         }
 674
 675         /* Create mapping */
 676         virq = irq_create_mapping(domain, hwirq);
 677         if (!virq)
 678                 return virq;
 679
 680         /* Set type if specified and different than the current one */
 681         if (type != IRQ_TYPE_NONE &&
 682             type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
 683                 irq_set_irq_type(virq, type);
 684         return virq;
 685 }
 686 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 687
 688 /**
 689  * irq_dispose_mapping() - Unmap an interrupt
 690  * @virq: linux irq number of the interrupt to unmap
 691  */
 692 void irq_dispose_mapping(unsigned int virq)
 693 {
 694         struct irq_data *irq_data = irq_get_irq_data(virq);
 695         struct irq_domain *domain;
 696
 697         if (!virq || !irq_data)
 698                 return;
 699
 700         domain = irq_data->domain;
 701         if (WARN_ON(domain == NULL))
 702                 return;
 703
 704         /* Never unmap legacy interrupts */
 705         if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
 706                 return;
 707
 708         irq_domain_disassociate_many(domain, virq, 1);
 709         irq_free_desc(virq);
 710 }
 711 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 712
 713 /**
 714  * irq_find_mapping() - Find a linux irq from an hw irq number.
 715  * @domain: domain owning this hardware interrupt
 716  * @hwirq: hardware irq number in that domain space
 717  */
 718 unsigned int irq_find_mapping(struct irq_domain *domain,
 719                               irq_hw_number_t hwirq)
 720 {
 721         struct irq_data *data;
 722
 723         /* Look for default domain if nececssary */
 724         if (domain == NULL)
 725                 domain = irq_default_domain;
 726         if (domain == NULL)
 727                 return 0;
 728
 729         switch (domain->revmap_type) {
 730         case IRQ_DOMAIN_MAP_LEGACY:
 731                 return irq_domain_legacy_revmap(domain, hwirq);
 732         case IRQ_DOMAIN_MAP_LINEAR:
 733                 return irq_linear_revmap(domain, hwirq);
 734         case IRQ_DOMAIN_MAP_TREE:
 735                 rcu_read_lock();
 736                 data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
 737                 rcu_read_unlock();
 738                 if (data)
 739                         return data->irq;
 740                 break;
 741         case IRQ_DOMAIN_MAP_NOMAP:
 742                 data = irq_get_irq_data(hwirq);
 743                 if (data && (data->domain == domain) && (data->hwirq == hwirq))
 744                         return hwirq;
 745                 break;
 746         }
 747
 748         return 0;
 749 }
 750 EXPORT_SYMBOL_GPL(irq_find_mapping);
 751
 752 /**
 753  * irq_linear_revmap() - Find a linux irq from a hw irq number.
 754  * @domain: domain owning this hardware interrupt
 755  * @hwirq: hardware irq number in that domain space
 756  *
 757  * This is a fast path that can be called directly by irq controller code to
 758  * save a handful of instructions.
 759  */
 760 unsigned int irq_linear_revmap(struct irq_domain *domain,
 761                                irq_hw_number_t hwirq)
 762 {
 763         BUG_ON(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR);
 764
 765         /* Check revmap bounds; complain if exceeded */
 766         if (WARN_ON(hwirq >= domain->revmap_data.linear.size))
 767                 return 0;
 768
 769         return domain->revmap_data.linear.revmap[hwirq];
 770 }
 771 EXPORT_SYMBOL_GPL(irq_linear_revmap);
 772
 773 #ifdef CONFIG_IRQ_DOMAIN_DEBUG
 774 static int virq_debug_show(struct seq_file *m, void *private)
 775 {
 776         unsigned long flags;
 777         struct irq_desc *desc;
 778         const char *p;
 779         static const char none[] = "none";
 780         void *data;
 781         int i;
 782
 783         seq_printf(m, "%-5s  %-7s  %-15s  %-*s  %s\n", "irq", "hwirq",
 784                       "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
 785                       "domain name");
 786
 787         for (i = 1; i < nr_irqs; i++) {
 788                 desc = irq_to_desc(i);
 789                 if (!desc)
 790                         continue;
 791
 792                 raw_spin_lock_irqsave(&desc->lock, flags);
 793
 794                 if (desc->action && desc->action->handler) {
 795                         struct irq_chip *chip;
 796
 797                         seq_printf(m, "%5d  ", i);
 798                         seq_printf(m, "0x%05lx  ", desc->irq_data.hwirq);
 799
 800                         chip = irq_desc_get_chip(desc);
 801                         if (chip && chip->name)
 802                                 p = chip->name;
 803                         else
 804                                 p = none;
 805                         seq_printf(m, "%-15s  ", p);
 806
 807                         data = irq_desc_get_chip_data(desc);
 808                         seq_printf(m, data ? "0x%p  " : "  %p  ", data);
 809
 810                         if (desc->irq_data.domain)
 811                                 p = of_node_full_name(desc->irq_data.domain->of_node);
 812                         else
 813                                 p = none;
 814                         seq_printf(m, "%s\n", p);
 815                 }
 816
 817                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 818         }
 819
 820         return 0;
 821 }
 822
 823 static int virq_debug_open(struct inode *inode, struct file *file)
 824 {
 825         return single_open(file, virq_debug_show, inode->i_private);
 826 }
 827
 828 static const struct file_operations virq_debug_fops = {
 829         .open = virq_debug_open,
 830         .read = seq_read,
 831         .llseek = seq_lseek,
 832         .release = single_release,
 833 };
 834
 835 static int __init irq_debugfs_init(void)
 836 {
 837         if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
 838                                  NULL, &virq_debug_fops) == NULL)
 839                 return -ENOMEM;
 840
 841         return 0;
 842 }
 843 __initcall(irq_debugfs_init);
 844 #endif /* CONFIG_IRQ_DOMAIN_DEBUG */
 845
 846 /**
 847  * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
 848  *
 849  * Device Tree IRQ specifier translation function which works with one cell
 850  * bindings where the cell value maps directly to the hwirq number.
 851  */
 852 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
 853                              const u32 *intspec, unsigned int intsize,
 854                              unsigned long *out_hwirq, unsigned int *out_type)
 855 {
 856         if (WARN_ON(intsize < 1))
 857                 return -EINVAL;
 858         *out_hwirq = intspec[0];
 859         *out_type = IRQ_TYPE_NONE;
 860         return 0;
 861 }
 862 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
 863
 864 /**
 865  * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
 866  *
 867  * Device Tree IRQ specifier translation function which works with two cell
 868  * bindings where the cell values map directly to the hwirq number
 869  * and linux irq flags.
 870  */
 871 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
 872                         const u32 *intspec, unsigned int intsize,
 873                         irq_hw_number_t *out_hwirq, unsigned int *out_type)
 874 {
 875         if (WARN_ON(intsize < 2))
 876                 return -EINVAL;
 877         *out_hwirq = intspec[0];
 878         *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
 879         return 0;
 880 }
 881 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
 882
 883 /**
 884  * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
 885  *
 886  * Device Tree IRQ specifier translation function which works with either one
 887  * or two cell bindings where the cell values map directly to the hwirq number
 888  * and linux irq flags.
 889  *
 890  * Note: don't use this function unless your interrupt controller explicitly
 891  * supports both one and two cell bindings.  For the majority of controllers
 892  * the _onecell() or _twocell() variants above should be used.
 893  */
 894 int irq_domain_xlate_onetwocell(struct irq_domain *d,
 895                                 struct device_node *ctrlr,
 896                                 const u32 *intspec, unsigned int intsize,
 897                                 unsigned long *out_hwirq, unsigned int *out_type)
 898 {
 899         if (WARN_ON(intsize < 1))
 900                 return -EINVAL;
 901         *out_hwirq = intspec[0];
 902         *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
 903         return 0;
 904 }
 905 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
 906
 907 const struct irq_domain_ops irq_domain_simple_ops = {
 908         .xlate = irq_domain_xlate_onetwocell,
 909 };
 910 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
 911
 912 #ifdef CONFIG_OF_IRQ
 913 void irq_domain_generate_simple(const struct of_device_id *match,
 914                                 u64 phys_base, unsigned int irq_start)
 915 {
 916         struct device_node *node;
 917         pr_debug("looking for phys_base=%llx, irq_start=%i\n",
 918                 (unsigned long long) phys_base, (int) irq_start);
 919         node = of_find_matching_node_by_address(NULL, match, phys_base);
 920         if (node)
 921                 irq_domain_add_legacy(node, 32, irq_start, 0,
 922                                       &irq_domain_simple_ops, NULL);
 923 }
 924 EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
 925 #endif