kernel/irq/irqdomain.c

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