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TOMOYO Linux Cross Reference
Linux/kernel/irq/irqdomain.c

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  1 #define pr_fmt(fmt)  "irq: " fmt
  2 
  3 #include <linux/acpi.h>
  4 #include <linux/debugfs.h>
  5 #include <linux/hardirq.h>
  6 #include <linux/interrupt.h>
  7 #include <linux/irq.h>
  8 #include <linux/irqdesc.h>
  9 #include <linux/irqdomain.h>
 10 #include <linux/module.h>
 11 #include <linux/mutex.h>
 12 #include <linux/of.h>
 13 #include <linux/of_address.h>
 14 #include <linux/of_irq.h>
 15 #include <linux/topology.h>
 16 #include <linux/seq_file.h>
 17 #include <linux/slab.h>
 18 #include <linux/smp.h>
 19 #include <linux/fs.h>
 20 
 21 static LIST_HEAD(irq_domain_list);
 22 static DEFINE_MUTEX(irq_domain_mutex);
 23 
 24 static struct irq_domain *irq_default_domain;
 25 
 26 static void irq_domain_check_hierarchy(struct irq_domain *domain);
 27 
 28 struct irqchip_fwid {
 29         struct fwnode_handle    fwnode;
 30         unsigned int            type;
 31         char                    *name;
 32         void *data;
 33 };
 34 
 35 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
 36 static void debugfs_add_domain_dir(struct irq_domain *d);
 37 static void debugfs_remove_domain_dir(struct irq_domain *d);
 38 #else
 39 static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
 40 static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
 41 #endif
 42 
 43 const struct fwnode_operations irqchip_fwnode_ops;
 44 EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
 45 
 46 /**
 47  * irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
 48  *                           identifying an irq domain
 49  * @type:       Type of irqchip_fwnode. See linux/irqdomain.h
 50  * @name:       Optional user provided domain name
 51  * @id:         Optional user provided id if name != NULL
 52  * @data:       Optional user-provided data
 53  *
 54  * Allocate a struct irqchip_fwid, and return a poiner to the embedded
 55  * fwnode_handle (or NULL on failure).
 56  *
 57  * Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
 58  * solely to transport name information to irqdomain creation code. The
 59  * node is not stored. For other types the pointer is kept in the irq
 60  * domain struct.
 61  */
 62 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
 63                                                 const char *name, void *data)
 64 {
 65         struct irqchip_fwid *fwid;
 66         char *n;
 67 
 68         fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
 69 
 70         switch (type) {
 71         case IRQCHIP_FWNODE_NAMED:
 72                 n = kasprintf(GFP_KERNEL, "%s", name);
 73                 break;
 74         case IRQCHIP_FWNODE_NAMED_ID:
 75                 n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
 76                 break;
 77         default:
 78                 n = kasprintf(GFP_KERNEL, "irqchip@%p", data);
 79                 break;
 80         }
 81 
 82         if (!fwid || !n) {
 83                 kfree(fwid);
 84                 kfree(n);
 85                 return NULL;
 86         }
 87 
 88         fwid->type = type;
 89         fwid->name = n;
 90         fwid->data = data;
 91         fwid->fwnode.ops = &irqchip_fwnode_ops;
 92         return &fwid->fwnode;
 93 }
 94 EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
 95 
 96 /**
 97  * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
 98  *
 99  * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
100  */
101 void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
102 {
103         struct irqchip_fwid *fwid;
104 
105         if (WARN_ON(!is_fwnode_irqchip(fwnode)))
106                 return;
107 
108         fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
109         kfree(fwid->name);
110         kfree(fwid);
111 }
112 EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
113 
114 /**
115  * __irq_domain_add() - Allocate a new irq_domain data structure
116  * @fwnode: firmware node for the interrupt controller
117  * @size: Size of linear map; 0 for radix mapping only
118  * @hwirq_max: Maximum number of interrupts supported by controller
119  * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
120  *              direct mapping
121  * @ops: domain callbacks
122  * @host_data: Controller private data pointer
123  *
124  * Allocates and initialize and irq_domain structure.
125  * Returns pointer to IRQ domain, or NULL on failure.
126  */
127 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
128                                     irq_hw_number_t hwirq_max, int direct_max,
129                                     const struct irq_domain_ops *ops,
130                                     void *host_data)
131 {
132         struct device_node *of_node = to_of_node(fwnode);
133         struct irqchip_fwid *fwid;
134         struct irq_domain *domain;
135 
136         static atomic_t unknown_domains;
137 
138         domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
139                               GFP_KERNEL, of_node_to_nid(of_node));
140         if (WARN_ON(!domain))
141                 return NULL;
142 
143         if (fwnode && is_fwnode_irqchip(fwnode)) {
144                 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
145 
146                 switch (fwid->type) {
147                 case IRQCHIP_FWNODE_NAMED:
148                 case IRQCHIP_FWNODE_NAMED_ID:
149                         domain->name = kstrdup(fwid->name, GFP_KERNEL);
150                         if (!domain->name) {
151                                 kfree(domain);
152                                 return NULL;
153                         }
154                         domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
155                         break;
156                 default:
157                         domain->fwnode = fwnode;
158                         domain->name = fwid->name;
159                         break;
160                 }
161 #ifdef CONFIG_ACPI
162         } else if (is_acpi_device_node(fwnode)) {
163                 struct acpi_buffer buf = {
164                         .length = ACPI_ALLOCATE_BUFFER,
165                 };
166                 acpi_handle handle;
167 
168                 handle = acpi_device_handle(to_acpi_device_node(fwnode));
169                 if (acpi_get_name(handle, ACPI_FULL_PATHNAME, &buf) == AE_OK) {
170                         domain->name = buf.pointer;
171                         domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
172                 }
173 
174                 domain->fwnode = fwnode;
175 #endif
176         } else if (of_node) {
177                 char *name;
178 
179                 /*
180                  * DT paths contain '/', which debugfs is legitimately
181                  * unhappy about. Replace them with ':', which does
182                  * the trick and is not as offensive as '\'...
183                  */
184                 name = kstrdup(of_node_full_name(of_node), GFP_KERNEL);
185                 if (!name) {
186                         kfree(domain);
187                         return NULL;
188                 }
189 
190                 strreplace(name, '/', ':');
191 
192                 domain->name = name;
193                 domain->fwnode = fwnode;
194                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
195         }
196 
197         if (!domain->name) {
198                 if (fwnode)
199                         pr_err("Invalid fwnode type for irqdomain\n");
200                 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
201                                          atomic_inc_return(&unknown_domains));
202                 if (!domain->name) {
203                         kfree(domain);
204                         return NULL;
205                 }
206                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
207         }
208 
209         of_node_get(of_node);
210 
211         /* Fill structure */
212         INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
213         mutex_init(&domain->revmap_tree_mutex);
214         domain->ops = ops;
215         domain->host_data = host_data;
216         domain->hwirq_max = hwirq_max;
217         domain->revmap_size = size;
218         domain->revmap_direct_max_irq = direct_max;
219         irq_domain_check_hierarchy(domain);
220 
221         mutex_lock(&irq_domain_mutex);
222         debugfs_add_domain_dir(domain);
223         list_add(&domain->link, &irq_domain_list);
224         mutex_unlock(&irq_domain_mutex);
225 
226         pr_debug("Added domain %s\n", domain->name);
227         return domain;
228 }
229 EXPORT_SYMBOL_GPL(__irq_domain_add);
230 
231 /**
232  * irq_domain_remove() - Remove an irq domain.
233  * @domain: domain to remove
234  *
235  * This routine is used to remove an irq domain. The caller must ensure
236  * that all mappings within the domain have been disposed of prior to
237  * use, depending on the revmap type.
238  */
239 void irq_domain_remove(struct irq_domain *domain)
240 {
241         mutex_lock(&irq_domain_mutex);
242         debugfs_remove_domain_dir(domain);
243 
244         WARN_ON(!radix_tree_empty(&domain->revmap_tree));
245 
246         list_del(&domain->link);
247 
248         /*
249          * If the going away domain is the default one, reset it.
250          */
251         if (unlikely(irq_default_domain == domain))
252                 irq_set_default_host(NULL);
253 
254         mutex_unlock(&irq_domain_mutex);
255 
256         pr_debug("Removed domain %s\n", domain->name);
257 
258         of_node_put(irq_domain_get_of_node(domain));
259         if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
260                 kfree(domain->name);
261         kfree(domain);
262 }
263 EXPORT_SYMBOL_GPL(irq_domain_remove);
264 
265 void irq_domain_update_bus_token(struct irq_domain *domain,
266                                  enum irq_domain_bus_token bus_token)
267 {
268         char *name;
269 
270         if (domain->bus_token == bus_token)
271                 return;
272 
273         mutex_lock(&irq_domain_mutex);
274 
275         domain->bus_token = bus_token;
276 
277         name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
278         if (!name) {
279                 mutex_unlock(&irq_domain_mutex);
280                 return;
281         }
282 
283         debugfs_remove_domain_dir(domain);
284 
285         if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
286                 kfree(domain->name);
287         else
288                 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
289 
290         domain->name = name;
291         debugfs_add_domain_dir(domain);
292 
293         mutex_unlock(&irq_domain_mutex);
294 }
295 
296 /**
297  * irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
298  * @of_node: pointer to interrupt controller's device tree node.
299  * @size: total number of irqs in mapping
300  * @first_irq: first number of irq block assigned to the domain,
301  *      pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
302  *      pre-map all of the irqs in the domain to virqs starting at first_irq.
303  * @ops: domain callbacks
304  * @host_data: Controller private data pointer
305  *
306  * Allocates an irq_domain, and optionally if first_irq is positive then also
307  * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
308  *
309  * This is intended to implement the expected behaviour for most
310  * interrupt controllers. If device tree is used, then first_irq will be 0 and
311  * irqs get mapped dynamically on the fly. However, if the controller requires
312  * static virq assignments (non-DT boot) then it will set that up correctly.
313  */
314 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
315                                          unsigned int size,
316                                          unsigned int first_irq,
317                                          const struct irq_domain_ops *ops,
318                                          void *host_data)
319 {
320         struct irq_domain *domain;
321 
322         domain = __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
323         if (!domain)
324                 return NULL;
325 
326         if (first_irq > 0) {
327                 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
328                         /* attempt to allocated irq_descs */
329                         int rc = irq_alloc_descs(first_irq, first_irq, size,
330                                                  of_node_to_nid(of_node));
331                         if (rc < 0)
332                                 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
333                                         first_irq);
334                 }
335                 irq_domain_associate_many(domain, first_irq, 0, size);
336         }
337 
338         return domain;
339 }
340 EXPORT_SYMBOL_GPL(irq_domain_add_simple);
341 
342 /**
343  * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
344  * @of_node: pointer to interrupt controller's device tree node.
345  * @size: total number of irqs in legacy mapping
346  * @first_irq: first number of irq block assigned to the domain
347  * @first_hwirq: first hwirq number to use for the translation. Should normally
348  *               be '', but a positive integer can be used if the effective
349  *               hwirqs numbering does not begin at zero.
350  * @ops: map/unmap domain callbacks
351  * @host_data: Controller private data pointer
352  *
353  * Note: the map() callback will be called before this function returns
354  * for all legacy interrupts except 0 (which is always the invalid irq for
355  * a legacy controller).
356  */
357 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
358                                          unsigned int size,
359                                          unsigned int first_irq,
360                                          irq_hw_number_t first_hwirq,
361                                          const struct irq_domain_ops *ops,
362                                          void *host_data)
363 {
364         struct irq_domain *domain;
365 
366         domain = __irq_domain_add(of_node_to_fwnode(of_node), first_hwirq + size,
367                                   first_hwirq + size, 0, ops, host_data);
368         if (domain)
369                 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
370 
371         return domain;
372 }
373 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
374 
375 /**
376  * irq_find_matching_fwspec() - Locates a domain for a given fwspec
377  * @fwspec: FW specifier for an interrupt
378  * @bus_token: domain-specific data
379  */
380 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
381                                             enum irq_domain_bus_token bus_token)
382 {
383         struct irq_domain *h, *found = NULL;
384         struct fwnode_handle *fwnode = fwspec->fwnode;
385         int rc;
386 
387         /* We might want to match the legacy controller last since
388          * it might potentially be set to match all interrupts in
389          * the absence of a device node. This isn't a problem so far
390          * yet though...
391          *
392          * bus_token == DOMAIN_BUS_ANY matches any domain, any other
393          * values must generate an exact match for the domain to be
394          * selected.
395          */
396         mutex_lock(&irq_domain_mutex);
397         list_for_each_entry(h, &irq_domain_list, link) {
398                 if (h->ops->select && fwspec->param_count)
399                         rc = h->ops->select(h, fwspec, bus_token);
400                 else if (h->ops->match)
401                         rc = h->ops->match(h, to_of_node(fwnode), bus_token);
402                 else
403                         rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
404                               ((bus_token == DOMAIN_BUS_ANY) ||
405                                (h->bus_token == bus_token)));
406 
407                 if (rc) {
408                         found = h;
409                         break;
410                 }
411         }
412         mutex_unlock(&irq_domain_mutex);
413         return found;
414 }
415 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
416 
417 /**
418  * irq_domain_check_msi_remap - Check whether all MSI irq domains implement
419  * IRQ remapping
420  *
421  * Return: false if any MSI irq domain does not support IRQ remapping,
422  * true otherwise (including if there is no MSI irq domain)
423  */
424 bool irq_domain_check_msi_remap(void)
425 {
426         struct irq_domain *h;
427         bool ret = true;
428 
429         mutex_lock(&irq_domain_mutex);
430         list_for_each_entry(h, &irq_domain_list, link) {
431                 if (irq_domain_is_msi(h) &&
432                     !irq_domain_hierarchical_is_msi_remap(h)) {
433                         ret = false;
434                         break;
435                 }
436         }
437         mutex_unlock(&irq_domain_mutex);
438         return ret;
439 }
440 EXPORT_SYMBOL_GPL(irq_domain_check_msi_remap);
441 
442 /**
443  * irq_set_default_host() - Set a "default" irq domain
444  * @domain: default domain pointer
445  *
446  * For convenience, it's possible to set a "default" domain that will be used
447  * whenever NULL is passed to irq_create_mapping(). It makes life easier for
448  * platforms that want to manipulate a few hard coded interrupt numbers that
449  * aren't properly represented in the device-tree.
450  */
451 void irq_set_default_host(struct irq_domain *domain)
452 {
453         pr_debug("Default domain set to @0x%p\n", domain);
454 
455         irq_default_domain = domain;
456 }
457 EXPORT_SYMBOL_GPL(irq_set_default_host);
458 
459 static void irq_domain_clear_mapping(struct irq_domain *domain,
460                                      irq_hw_number_t hwirq)
461 {
462         if (hwirq < domain->revmap_size) {
463                 domain->linear_revmap[hwirq] = 0;
464         } else {
465                 mutex_lock(&domain->revmap_tree_mutex);
466                 radix_tree_delete(&domain->revmap_tree, hwirq);
467                 mutex_unlock(&domain->revmap_tree_mutex);
468         }
469 }
470 
471 static void irq_domain_set_mapping(struct irq_domain *domain,
472                                    irq_hw_number_t hwirq,
473                                    struct irq_data *irq_data)
474 {
475         if (hwirq < domain->revmap_size) {
476                 domain->linear_revmap[hwirq] = irq_data->irq;
477         } else {
478                 mutex_lock(&domain->revmap_tree_mutex);
479                 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
480                 mutex_unlock(&domain->revmap_tree_mutex);
481         }
482 }
483 
484 void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
485 {
486         struct irq_data *irq_data = irq_get_irq_data(irq);
487         irq_hw_number_t hwirq;
488 
489         if (WARN(!irq_data || irq_data->domain != domain,
490                  "virq%i doesn't exist; cannot disassociate\n", irq))
491                 return;
492 
493         hwirq = irq_data->hwirq;
494         irq_set_status_flags(irq, IRQ_NOREQUEST);
495 
496         /* remove chip and handler */
497         irq_set_chip_and_handler(irq, NULL, NULL);
498 
499         /* Make sure it's completed */
500         synchronize_irq(irq);
501 
502         /* Tell the PIC about it */
503         if (domain->ops->unmap)
504                 domain->ops->unmap(domain, irq);
505         smp_mb();
506 
507         irq_data->domain = NULL;
508         irq_data->hwirq = 0;
509         domain->mapcount--;
510 
511         /* Clear reverse map for this hwirq */
512         irq_domain_clear_mapping(domain, hwirq);
513 }
514 
515 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
516                          irq_hw_number_t hwirq)
517 {
518         struct irq_data *irq_data = irq_get_irq_data(virq);
519         int ret;
520 
521         if (WARN(hwirq >= domain->hwirq_max,
522                  "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
523                 return -EINVAL;
524         if (WARN(!irq_data, "error: virq%i is not allocated", virq))
525                 return -EINVAL;
526         if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
527                 return -EINVAL;
528 
529         mutex_lock(&irq_domain_mutex);
530         irq_data->hwirq = hwirq;
531         irq_data->domain = domain;
532         if (domain->ops->map) {
533                 ret = domain->ops->map(domain, virq, hwirq);
534                 if (ret != 0) {
535                         /*
536                          * If map() returns -EPERM, this interrupt is protected
537                          * by the firmware or some other service and shall not
538                          * be mapped. Don't bother telling the user about it.
539                          */
540                         if (ret != -EPERM) {
541                                 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
542                                        domain->name, hwirq, virq, ret);
543                         }
544                         irq_data->domain = NULL;
545                         irq_data->hwirq = 0;
546                         mutex_unlock(&irq_domain_mutex);
547                         return ret;
548                 }
549 
550                 /* If not already assigned, give the domain the chip's name */
551                 if (!domain->name && irq_data->chip)
552                         domain->name = irq_data->chip->name;
553         }
554 
555         domain->mapcount++;
556         irq_domain_set_mapping(domain, hwirq, irq_data);
557         mutex_unlock(&irq_domain_mutex);
558 
559         irq_clear_status_flags(virq, IRQ_NOREQUEST);
560 
561         return 0;
562 }
563 EXPORT_SYMBOL_GPL(irq_domain_associate);
564 
565 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
566                                irq_hw_number_t hwirq_base, int count)
567 {
568         struct device_node *of_node;
569         int i;
570 
571         of_node = irq_domain_get_of_node(domain);
572         pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
573                 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
574 
575         for (i = 0; i < count; i++) {
576                 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
577         }
578 }
579 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
580 
581 /**
582  * irq_create_direct_mapping() - Allocate an irq for direct mapping
583  * @domain: domain to allocate the irq for or NULL for default domain
584  *
585  * This routine is used for irq controllers which can choose the hardware
586  * interrupt numbers they generate. In such a case it's simplest to use
587  * the linux irq as the hardware interrupt number. It still uses the linear
588  * or radix tree to store the mapping, but the irq controller can optimize
589  * the revmap path by using the hwirq directly.
590  */
591 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
592 {
593         struct device_node *of_node;
594         unsigned int virq;
595 
596         if (domain == NULL)
597                 domain = irq_default_domain;
598 
599         of_node = irq_domain_get_of_node(domain);
600         virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
601         if (!virq) {
602                 pr_debug("create_direct virq allocation failed\n");
603                 return 0;
604         }
605         if (virq >= domain->revmap_direct_max_irq) {
606                 pr_err("ERROR: no free irqs available below %i maximum\n",
607                         domain->revmap_direct_max_irq);
608                 irq_free_desc(virq);
609                 return 0;
610         }
611         pr_debug("create_direct obtained virq %d\n", virq);
612 
613         if (irq_domain_associate(domain, virq, virq)) {
614                 irq_free_desc(virq);
615                 return 0;
616         }
617 
618         return virq;
619 }
620 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
621 
622 /**
623  * irq_create_mapping() - Map a hardware interrupt into linux irq space
624  * @domain: domain owning this hardware interrupt or NULL for default domain
625  * @hwirq: hardware irq number in that domain space
626  *
627  * Only one mapping per hardware interrupt is permitted. Returns a linux
628  * irq number.
629  * If the sense/trigger is to be specified, set_irq_type() should be called
630  * on the number returned from that call.
631  */
632 unsigned int irq_create_mapping(struct irq_domain *domain,
633                                 irq_hw_number_t hwirq)
634 {
635         struct device_node *of_node;
636         int virq;
637 
638         pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
639 
640         /* Look for default domain if nececssary */
641         if (domain == NULL)
642                 domain = irq_default_domain;
643         if (domain == NULL) {
644                 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
645                 return 0;
646         }
647         pr_debug("-> using domain @%p\n", domain);
648 
649         of_node = irq_domain_get_of_node(domain);
650 
651         /* Check if mapping already exists */
652         virq = irq_find_mapping(domain, hwirq);
653         if (virq) {
654                 pr_debug("-> existing mapping on virq %d\n", virq);
655                 return virq;
656         }
657 
658         /* Allocate a virtual interrupt number */
659         virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), NULL);
660         if (virq <= 0) {
661                 pr_debug("-> virq allocation failed\n");
662                 return 0;
663         }
664 
665         if (irq_domain_associate(domain, virq, hwirq)) {
666                 irq_free_desc(virq);
667                 return 0;
668         }
669 
670         pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
671                 hwirq, of_node_full_name(of_node), virq);
672 
673         return virq;
674 }
675 EXPORT_SYMBOL_GPL(irq_create_mapping);
676 
677 /**
678  * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
679  * @domain: domain owning the interrupt range
680  * @irq_base: beginning of linux IRQ range
681  * @hwirq_base: beginning of hardware IRQ range
682  * @count: Number of interrupts to map
683  *
684  * This routine is used for allocating and mapping a range of hardware
685  * irqs to linux irqs where the linux irq numbers are at pre-defined
686  * locations. For use by controllers that already have static mappings
687  * to insert in to the domain.
688  *
689  * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
690  * domain insertion.
691  *
692  * 0 is returned upon success, while any failure to establish a static
693  * mapping is treated as an error.
694  */
695 int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
696                                irq_hw_number_t hwirq_base, int count)
697 {
698         struct device_node *of_node;
699         int ret;
700 
701         of_node = irq_domain_get_of_node(domain);
702         ret = irq_alloc_descs(irq_base, irq_base, count,
703                               of_node_to_nid(of_node));
704         if (unlikely(ret < 0))
705                 return ret;
706 
707         irq_domain_associate_many(domain, irq_base, hwirq_base, count);
708         return 0;
709 }
710 EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
711 
712 static int irq_domain_translate(struct irq_domain *d,
713                                 struct irq_fwspec *fwspec,
714                                 irq_hw_number_t *hwirq, unsigned int *type)
715 {
716 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
717         if (d->ops->translate)
718                 return d->ops->translate(d, fwspec, hwirq, type);
719 #endif
720         if (d->ops->xlate)
721                 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
722                                      fwspec->param, fwspec->param_count,
723                                      hwirq, type);
724 
725         /* If domain has no translation, then we assume interrupt line */
726         *hwirq = fwspec->param[0];
727         return 0;
728 }
729 
730 static void of_phandle_args_to_fwspec(struct of_phandle_args *irq_data,
731                                       struct irq_fwspec *fwspec)
732 {
733         int i;
734 
735         fwspec->fwnode = irq_data->np ? &irq_data->np->fwnode : NULL;
736         fwspec->param_count = irq_data->args_count;
737 
738         for (i = 0; i < irq_data->args_count; i++)
739                 fwspec->param[i] = irq_data->args[i];
740 }
741 
742 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
743 {
744         struct irq_domain *domain;
745         struct irq_data *irq_data;
746         irq_hw_number_t hwirq;
747         unsigned int type = IRQ_TYPE_NONE;
748         int virq;
749 
750         if (fwspec->fwnode) {
751                 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
752                 if (!domain)
753                         domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
754         } else {
755                 domain = irq_default_domain;
756         }
757 
758         if (!domain) {
759                 pr_warn("no irq domain found for %s !\n",
760                         of_node_full_name(to_of_node(fwspec->fwnode)));
761                 return 0;
762         }
763 
764         if (irq_domain_translate(domain, fwspec, &hwirq, &type))
765                 return 0;
766 
767         /*
768          * WARN if the irqchip returns a type with bits
769          * outside the sense mask set and clear these bits.
770          */
771         if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
772                 type &= IRQ_TYPE_SENSE_MASK;
773 
774         /*
775          * If we've already configured this interrupt,
776          * don't do it again, or hell will break loose.
777          */
778         virq = irq_find_mapping(domain, hwirq);
779         if (virq) {
780                 /*
781                  * If the trigger type is not specified or matches the
782                  * current trigger type then we are done so return the
783                  * interrupt number.
784                  */
785                 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
786                         return virq;
787 
788                 /*
789                  * If the trigger type has not been set yet, then set
790                  * it now and return the interrupt number.
791                  */
792                 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
793                         irq_data = irq_get_irq_data(virq);
794                         if (!irq_data)
795                                 return 0;
796 
797                         irqd_set_trigger_type(irq_data, type);
798                         return virq;
799                 }
800 
801                 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
802                         hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
803                 return 0;
804         }
805 
806         if (irq_domain_is_hierarchy(domain)) {
807                 virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
808                 if (virq <= 0)
809                         return 0;
810         } else {
811                 /* Create mapping */
812                 virq = irq_create_mapping(domain, hwirq);
813                 if (!virq)
814                         return virq;
815         }
816 
817         irq_data = irq_get_irq_data(virq);
818         if (!irq_data) {
819                 if (irq_domain_is_hierarchy(domain))
820                         irq_domain_free_irqs(virq, 1);
821                 else
822                         irq_dispose_mapping(virq);
823                 return 0;
824         }
825 
826         /* Store trigger type */
827         irqd_set_trigger_type(irq_data, type);
828 
829         return virq;
830 }
831 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
832 
833 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
834 {
835         struct irq_fwspec fwspec;
836 
837         of_phandle_args_to_fwspec(irq_data, &fwspec);
838         return irq_create_fwspec_mapping(&fwspec);
839 }
840 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
841 
842 /**
843  * irq_dispose_mapping() - Unmap an interrupt
844  * @virq: linux irq number of the interrupt to unmap
845  */
846 void irq_dispose_mapping(unsigned int virq)
847 {
848         struct irq_data *irq_data = irq_get_irq_data(virq);
849         struct irq_domain *domain;
850 
851         if (!virq || !irq_data)
852                 return;
853 
854         domain = irq_data->domain;
855         if (WARN_ON(domain == NULL))
856                 return;
857 
858         if (irq_domain_is_hierarchy(domain)) {
859                 irq_domain_free_irqs(virq, 1);
860         } else {
861                 irq_domain_disassociate(domain, virq);
862                 irq_free_desc(virq);
863         }
864 }
865 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
866 
867 /**
868  * irq_find_mapping() - Find a linux irq from an hw irq number.
869  * @domain: domain owning this hardware interrupt
870  * @hwirq: hardware irq number in that domain space
871  */
872 unsigned int irq_find_mapping(struct irq_domain *domain,
873                               irq_hw_number_t hwirq)
874 {
875         struct irq_data *data;
876 
877         /* Look for default domain if nececssary */
878         if (domain == NULL)
879                 domain = irq_default_domain;
880         if (domain == NULL)
881                 return 0;
882 
883         if (hwirq < domain->revmap_direct_max_irq) {
884                 data = irq_domain_get_irq_data(domain, hwirq);
885                 if (data && data->hwirq == hwirq)
886                         return hwirq;
887         }
888 
889         /* Check if the hwirq is in the linear revmap. */
890         if (hwirq < domain->revmap_size)
891                 return domain->linear_revmap[hwirq];
892 
893         rcu_read_lock();
894         data = radix_tree_lookup(&domain->revmap_tree, hwirq);
895         rcu_read_unlock();
896         return data ? data->irq : 0;
897 }
898 EXPORT_SYMBOL_GPL(irq_find_mapping);
899 
900 #ifdef CONFIG_IRQ_DOMAIN_DEBUG
901 static void virq_debug_show_one(struct seq_file *m, struct irq_desc *desc)
902 {
903         struct irq_domain *domain;
904         struct irq_data *data;
905 
906         domain = desc->irq_data.domain;
907         data = &desc->irq_data;
908 
909         while (domain) {
910                 unsigned int irq = data->irq;
911                 unsigned long hwirq = data->hwirq;
912                 struct irq_chip *chip;
913                 bool direct;
914 
915                 if (data == &desc->irq_data)
916                         seq_printf(m, "%5d  ", irq);
917                 else
918                         seq_printf(m, "%5d+ ", irq);
919                 seq_printf(m, "0x%05lx  ", hwirq);
920 
921                 chip = irq_data_get_irq_chip(data);
922                 seq_printf(m, "%-15s  ", (chip && chip->name) ? chip->name : "none");
923 
924                 seq_printf(m, "0x%p  ", irq_data_get_irq_chip_data(data));
925 
926                 seq_printf(m, "   %c    ", (desc->action && desc->action->handler) ? '*' : ' ');
927                 direct = (irq == hwirq) && (irq < domain->revmap_direct_max_irq);
928                 seq_printf(m, "%6s%-8s  ",
929                            (hwirq < domain->revmap_size) ? "LINEAR" : "RADIX",
930                            direct ? "(DIRECT)" : "");
931                 seq_printf(m, "%s\n", domain->name);
932 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
933                 domain = domain->parent;
934                 data = data->parent_data;
935 #else
936                 domain = NULL;
937 #endif
938         }
939 }
940 
941 static int virq_debug_show(struct seq_file *m, void *private)
942 {
943         unsigned long flags;
944         struct irq_desc *desc;
945         struct irq_domain *domain;
946         struct radix_tree_iter iter;
947         void __rcu **slot;
948         int i;
949 
950         seq_printf(m, " %-16s  %-6s  %-10s  %-10s  %s\n",
951                    "name", "mapped", "linear-max", "direct-max", "devtree-node");
952         mutex_lock(&irq_domain_mutex);
953         list_for_each_entry(domain, &irq_domain_list, link) {
954                 struct device_node *of_node;
955                 const char *name;
956 
957                 int count = 0;
958 
959                 of_node = irq_domain_get_of_node(domain);
960                 if (of_node)
961                         name = of_node_full_name(of_node);
962                 else if (is_fwnode_irqchip(domain->fwnode))
963                         name = container_of(domain->fwnode, struct irqchip_fwid,
964                                             fwnode)->name;
965                 else
966                         name = "";
967 
968                 radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0)
969                         count++;
970                 seq_printf(m, "%c%-16s  %6u  %10u  %10u  %s\n",
971                            domain == irq_default_domain ? '*' : ' ', domain->name,
972                            domain->revmap_size + count, domain->revmap_size,
973                            domain->revmap_direct_max_irq,
974                            name);
975         }
976         mutex_unlock(&irq_domain_mutex);
977 
978         seq_printf(m, "%-5s  %-7s  %-15s  %-*s  %6s  %-14s  %s\n", "irq", "hwirq",
979                       "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
980                       "active", "type", "domain");
981 
982         for (i = 1; i < nr_irqs; i++) {
983                 desc = irq_to_desc(i);
984                 if (!desc)
985                         continue;
986 
987                 raw_spin_lock_irqsave(&desc->lock, flags);
988                 virq_debug_show_one(m, desc);
989                 raw_spin_unlock_irqrestore(&desc->lock, flags);
990         }
991 
992         return 0;
993 }
994 
995 static int virq_debug_open(struct inode *inode, struct file *file)
996 {
997         return single_open(file, virq_debug_show, inode->i_private);
998 }
999 
1000 static const struct file_operations virq_debug_fops = {
1001         .open = virq_debug_open,
1002         .read = seq_read,
1003         .llseek = seq_lseek,
1004         .release = single_release,
1005 };
1006 
1007 static int __init irq_debugfs_init(void)
1008 {
1009         if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
1010                                  NULL, &virq_debug_fops) == NULL)
1011                 return -ENOMEM;
1012 
1013         return 0;
1014 }
1015 __initcall(irq_debugfs_init);
1016 #endif /* CONFIG_IRQ_DOMAIN_DEBUG */
1017 
1018 /**
1019  * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
1020  *
1021  * Device Tree IRQ specifier translation function which works with one cell
1022  * bindings where the cell value maps directly to the hwirq number.
1023  */
1024 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
1025                              const u32 *intspec, unsigned int intsize,
1026                              unsigned long *out_hwirq, unsigned int *out_type)
1027 {
1028         if (WARN_ON(intsize < 1))
1029                 return -EINVAL;
1030         *out_hwirq = intspec[0];
1031         *out_type = IRQ_TYPE_NONE;
1032         return 0;
1033 }
1034 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
1035 
1036 /**
1037  * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1038  *
1039  * Device Tree IRQ specifier translation function which works with two cell
1040  * bindings where the cell values map directly to the hwirq number
1041  * and linux irq flags.
1042  */
1043 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1044                         const u32 *intspec, unsigned int intsize,
1045                         irq_hw_number_t *out_hwirq, unsigned int *out_type)
1046 {
1047         if (WARN_ON(intsize < 2))
1048                 return -EINVAL;
1049         *out_hwirq = intspec[0];
1050         *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1051         return 0;
1052 }
1053 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1054 
1055 /**
1056  * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1057  *
1058  * Device Tree IRQ specifier translation function which works with either one
1059  * or two cell bindings where the cell values map directly to the hwirq number
1060  * and linux irq flags.
1061  *
1062  * Note: don't use this function unless your interrupt controller explicitly
1063  * supports both one and two cell bindings.  For the majority of controllers
1064  * the _onecell() or _twocell() variants above should be used.
1065  */
1066 int irq_domain_xlate_onetwocell(struct irq_domain *d,
1067                                 struct device_node *ctrlr,
1068                                 const u32 *intspec, unsigned int intsize,
1069                                 unsigned long *out_hwirq, unsigned int *out_type)
1070 {
1071         if (WARN_ON(intsize < 1))
1072                 return -EINVAL;
1073         *out_hwirq = intspec[0];
1074         if (intsize > 1)
1075                 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1076         else
1077                 *out_type = IRQ_TYPE_NONE;
1078         return 0;
1079 }
1080 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1081 
1082 const struct irq_domain_ops irq_domain_simple_ops = {
1083         .xlate = irq_domain_xlate_onetwocell,
1084 };
1085 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1086 
1087 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1088                            int node, const struct cpumask *affinity)
1089 {
1090         unsigned int hint;
1091 
1092         if (virq >= 0) {
1093                 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1094                                          affinity);
1095         } else {
1096                 hint = hwirq % nr_irqs;
1097                 if (hint == 0)
1098                         hint++;
1099                 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1100                                          affinity);
1101                 if (virq <= 0 && hint > 1) {
1102                         virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1103                                                  affinity);
1104                 }
1105         }
1106 
1107         return virq;
1108 }
1109 
1110 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1111 /**
1112  * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1113  * @parent:     Parent irq domain to associate with the new domain
1114  * @flags:      Irq domain flags associated to the domain
1115  * @size:       Size of the domain. See below
1116  * @fwnode:     Optional fwnode of the interrupt controller
1117  * @ops:        Pointer to the interrupt domain callbacks
1118  * @host_data:  Controller private data pointer
1119  *
1120  * If @size is 0 a tree domain is created, otherwise a linear domain.
1121  *
1122  * If successful the parent is associated to the new domain and the
1123  * domain flags are set.
1124  * Returns pointer to IRQ domain, or NULL on failure.
1125  */
1126 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1127                                             unsigned int flags,
1128                                             unsigned int size,
1129                                             struct fwnode_handle *fwnode,
1130                                             const struct irq_domain_ops *ops,
1131                                             void *host_data)
1132 {
1133         struct irq_domain *domain;
1134 
1135         if (size)
1136                 domain = irq_domain_create_linear(fwnode, size, ops, host_data);
1137         else
1138                 domain = irq_domain_create_tree(fwnode, ops, host_data);
1139         if (domain) {
1140                 domain->parent = parent;
1141                 domain->flags |= flags;
1142         }
1143 
1144         return domain;
1145 }
1146 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1147 
1148 static void irq_domain_insert_irq(int virq)
1149 {
1150         struct irq_data *data;
1151 
1152         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1153                 struct irq_domain *domain = data->domain;
1154 
1155                 domain->mapcount++;
1156                 irq_domain_set_mapping(domain, data->hwirq, data);
1157 
1158                 /* If not already assigned, give the domain the chip's name */
1159                 if (!domain->name && data->chip)
1160                         domain->name = data->chip->name;
1161         }
1162 
1163         irq_clear_status_flags(virq, IRQ_NOREQUEST);
1164 }
1165 
1166 static void irq_domain_remove_irq(int virq)
1167 {
1168         struct irq_data *data;
1169 
1170         irq_set_status_flags(virq, IRQ_NOREQUEST);
1171         irq_set_chip_and_handler(virq, NULL, NULL);
1172         synchronize_irq(virq);
1173         smp_mb();
1174 
1175         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1176                 struct irq_domain *domain = data->domain;
1177                 irq_hw_number_t hwirq = data->hwirq;
1178 
1179                 domain->mapcount--;
1180                 irq_domain_clear_mapping(domain, hwirq);
1181         }
1182 }
1183 
1184 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1185                                                    struct irq_data *child)
1186 {
1187         struct irq_data *irq_data;
1188 
1189         irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1190                                 irq_data_get_node(child));
1191         if (irq_data) {
1192                 child->parent_data = irq_data;
1193                 irq_data->irq = child->irq;
1194                 irq_data->common = child->common;
1195                 irq_data->domain = domain;
1196         }
1197 
1198         return irq_data;
1199 }
1200 
1201 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1202 {
1203         struct irq_data *irq_data, *tmp;
1204         int i;
1205 
1206         for (i = 0; i < nr_irqs; i++) {
1207                 irq_data = irq_get_irq_data(virq + i);
1208                 tmp = irq_data->parent_data;
1209                 irq_data->parent_data = NULL;
1210                 irq_data->domain = NULL;
1211 
1212                 while (tmp) {
1213                         irq_data = tmp;
1214                         tmp = tmp->parent_data;
1215                         kfree(irq_data);
1216                 }
1217         }
1218 }
1219 
1220 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1221                                      unsigned int virq, unsigned int nr_irqs)
1222 {
1223         struct irq_data *irq_data;
1224         struct irq_domain *parent;
1225         int i;
1226 
1227         /* The outermost irq_data is embedded in struct irq_desc */
1228         for (i = 0; i < nr_irqs; i++) {
1229                 irq_data = irq_get_irq_data(virq + i);
1230                 irq_data->domain = domain;
1231 
1232                 for (parent = domain->parent; parent; parent = parent->parent) {
1233                         irq_data = irq_domain_insert_irq_data(parent, irq_data);
1234                         if (!irq_data) {
1235                                 irq_domain_free_irq_data(virq, i + 1);
1236                                 return -ENOMEM;
1237                         }
1238                 }
1239         }
1240 
1241         return 0;
1242 }
1243 
1244 /**
1245  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1246  * @domain:     domain to match
1247  * @virq:       IRQ number to get irq_data
1248  */
1249 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1250                                          unsigned int virq)
1251 {
1252         struct irq_data *irq_data;
1253 
1254         for (irq_data = irq_get_irq_data(virq); irq_data;
1255              irq_data = irq_data->parent_data)
1256                 if (irq_data->domain == domain)
1257                         return irq_data;
1258 
1259         return NULL;
1260 }
1261 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1262 
1263 /**
1264  * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1265  * @domain:     Interrupt domain to match
1266  * @virq:       IRQ number
1267  * @hwirq:      The hwirq number
1268  * @chip:       The associated interrupt chip
1269  * @chip_data:  The associated chip data
1270  */
1271 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1272                                   irq_hw_number_t hwirq, struct irq_chip *chip,
1273                                   void *chip_data)
1274 {
1275         struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1276 
1277         if (!irq_data)
1278                 return -ENOENT;
1279 
1280         irq_data->hwirq = hwirq;
1281         irq_data->chip = chip ? chip : &no_irq_chip;
1282         irq_data->chip_data = chip_data;
1283 
1284         return 0;
1285 }
1286 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1287 
1288 /**
1289  * irq_domain_set_info - Set the complete data for a @virq in @domain
1290  * @domain:             Interrupt domain to match
1291  * @virq:               IRQ number
1292  * @hwirq:              The hardware interrupt number
1293  * @chip:               The associated interrupt chip
1294  * @chip_data:          The associated interrupt chip data
1295  * @handler:            The interrupt flow handler
1296  * @handler_data:       The interrupt flow handler data
1297  * @handler_name:       The interrupt handler name
1298  */
1299 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1300                          irq_hw_number_t hwirq, struct irq_chip *chip,
1301                          void *chip_data, irq_flow_handler_t handler,
1302                          void *handler_data, const char *handler_name)
1303 {
1304         irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1305         __irq_set_handler(virq, handler, 0, handler_name);
1306         irq_set_handler_data(virq, handler_data);
1307 }
1308 EXPORT_SYMBOL(irq_domain_set_info);
1309 
1310 /**
1311  * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1312  * @irq_data:   The pointer to irq_data
1313  */
1314 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1315 {
1316         irq_data->hwirq = 0;
1317         irq_data->chip = &no_irq_chip;
1318         irq_data->chip_data = NULL;
1319 }
1320 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1321 
1322 /**
1323  * irq_domain_free_irqs_common - Clear irq_data and free the parent
1324  * @domain:     Interrupt domain to match
1325  * @virq:       IRQ number to start with
1326  * @nr_irqs:    The number of irqs to free
1327  */
1328 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1329                                  unsigned int nr_irqs)
1330 {
1331         struct irq_data *irq_data;
1332         int i;
1333 
1334         for (i = 0; i < nr_irqs; i++) {
1335                 irq_data = irq_domain_get_irq_data(domain, virq + i);
1336                 if (irq_data)
1337                         irq_domain_reset_irq_data(irq_data);
1338         }
1339         irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1340 }
1341 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1342 
1343 /**
1344  * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1345  * @domain:     Interrupt domain to match
1346  * @virq:       IRQ number to start with
1347  * @nr_irqs:    The number of irqs to free
1348  */
1349 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1350                               unsigned int nr_irqs)
1351 {
1352         int i;
1353 
1354         for (i = 0; i < nr_irqs; i++) {
1355                 irq_set_handler_data(virq + i, NULL);
1356                 irq_set_handler(virq + i, NULL);
1357         }
1358         irq_domain_free_irqs_common(domain, virq, nr_irqs);
1359 }
1360 
1361 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1362                                            unsigned int irq_base,
1363                                            unsigned int nr_irqs)
1364 {
1365         if (domain->ops->free)
1366                 domain->ops->free(domain, irq_base, nr_irqs);
1367 }
1368 
1369 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1370                                     unsigned int irq_base,
1371                                     unsigned int nr_irqs, void *arg)
1372 {
1373         return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1374 }
1375 
1376 /**
1377  * __irq_domain_alloc_irqs - Allocate IRQs from domain
1378  * @domain:     domain to allocate from
1379  * @irq_base:   allocate specified IRQ nubmer if irq_base >= 0
1380  * @nr_irqs:    number of IRQs to allocate
1381  * @node:       NUMA node id for memory allocation
1382  * @arg:        domain specific argument
1383  * @realloc:    IRQ descriptors have already been allocated if true
1384  * @affinity:   Optional irq affinity mask for multiqueue devices
1385  *
1386  * Allocate IRQ numbers and initialized all data structures to support
1387  * hierarchy IRQ domains.
1388  * Parameter @realloc is mainly to support legacy IRQs.
1389  * Returns error code or allocated IRQ number
1390  *
1391  * The whole process to setup an IRQ has been split into two steps.
1392  * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1393  * descriptor and required hardware resources. The second step,
1394  * irq_domain_activate_irq(), is to program hardwares with preallocated
1395  * resources. In this way, it's easier to rollback when failing to
1396  * allocate resources.
1397  */
1398 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1399                             unsigned int nr_irqs, int node, void *arg,
1400                             bool realloc, const struct cpumask *affinity)
1401 {
1402         int i, ret, virq;
1403 
1404         if (domain == NULL) {
1405                 domain = irq_default_domain;
1406                 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1407                         return -EINVAL;
1408         }
1409 
1410         if (!domain->ops->alloc) {
1411                 pr_debug("domain->ops->alloc() is NULL\n");
1412                 return -ENOSYS;
1413         }
1414 
1415         if (realloc && irq_base >= 0) {
1416                 virq = irq_base;
1417         } else {
1418                 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1419                                               affinity);
1420                 if (virq < 0) {
1421                         pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1422                                  irq_base, nr_irqs);
1423                         return virq;
1424                 }
1425         }
1426 
1427         if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1428                 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1429                 ret = -ENOMEM;
1430                 goto out_free_desc;
1431         }
1432 
1433         mutex_lock(&irq_domain_mutex);
1434         ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1435         if (ret < 0) {
1436                 mutex_unlock(&irq_domain_mutex);
1437                 goto out_free_irq_data;
1438         }
1439         for (i = 0; i < nr_irqs; i++)
1440                 irq_domain_insert_irq(virq + i);
1441         mutex_unlock(&irq_domain_mutex);
1442 
1443         return virq;
1444 
1445 out_free_irq_data:
1446         irq_domain_free_irq_data(virq, nr_irqs);
1447 out_free_desc:
1448         irq_free_descs(virq, nr_irqs);
1449         return ret;
1450 }
1451 
1452 /* The irq_data was moved, fix the revmap to refer to the new location */
1453 static void irq_domain_fix_revmap(struct irq_data *d)
1454 {
1455         void __rcu **slot;
1456 
1457         if (d->hwirq < d->domain->revmap_size)
1458                 return; /* Not using radix tree. */
1459 
1460         /* Fix up the revmap. */
1461         mutex_lock(&d->domain->revmap_tree_mutex);
1462         slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1463         if (slot)
1464                 radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1465         mutex_unlock(&d->domain->revmap_tree_mutex);
1466 }
1467 
1468 /**
1469  * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1470  * @domain:     Domain to push.
1471  * @virq:       Irq to push the domain in to.
1472  * @arg:        Passed to the irq_domain_ops alloc() function.
1473  *
1474  * For an already existing irqdomain hierarchy, as might be obtained
1475  * via a call to pci_enable_msix(), add an additional domain to the
1476  * head of the processing chain.  Must be called before request_irq()
1477  * has been called.
1478  */
1479 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1480 {
1481         struct irq_data *child_irq_data;
1482         struct irq_data *root_irq_data = irq_get_irq_data(virq);
1483         struct irq_desc *desc;
1484         int rv = 0;
1485 
1486         /*
1487          * Check that no action has been set, which indicates the virq
1488          * is in a state where this function doesn't have to deal with
1489          * races between interrupt handling and maintaining the
1490          * hierarchy.  This will catch gross misuse.  Attempting to
1491          * make the check race free would require holding locks across
1492          * calls to struct irq_domain_ops->alloc(), which could lead
1493          * to deadlock, so we just do a simple check before starting.
1494          */
1495         desc = irq_to_desc(virq);
1496         if (!desc)
1497                 return -EINVAL;
1498         if (WARN_ON(desc->action))
1499                 return -EBUSY;
1500 
1501         if (domain == NULL)
1502                 return -EINVAL;
1503 
1504         if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1505                 return -EINVAL;
1506 
1507         if (!root_irq_data)
1508                 return -EINVAL;
1509 
1510         if (domain->parent != root_irq_data->domain)
1511                 return -EINVAL;
1512 
1513         child_irq_data = kzalloc_node(sizeof(*child_irq_data), GFP_KERNEL,
1514                                       irq_data_get_node(root_irq_data));
1515         if (!child_irq_data)
1516                 return -ENOMEM;
1517 
1518         mutex_lock(&irq_domain_mutex);
1519 
1520         /* Copy the original irq_data. */
1521         *child_irq_data = *root_irq_data;
1522 
1523         /*
1524          * Overwrite the root_irq_data, which is embedded in struct
1525          * irq_desc, with values for this domain.
1526          */
1527         root_irq_data->parent_data = child_irq_data;
1528         root_irq_data->domain = domain;
1529         root_irq_data->mask = 0;
1530         root_irq_data->hwirq = 0;
1531         root_irq_data->chip = NULL;
1532         root_irq_data->chip_data = NULL;
1533 
1534         /* May (probably does) set hwirq, chip, etc. */
1535         rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1536         if (rv) {
1537                 /* Restore the original irq_data. */
1538                 *root_irq_data = *child_irq_data;
1539                 goto error;
1540         }
1541 
1542         irq_domain_fix_revmap(child_irq_data);
1543         irq_domain_set_mapping(domain, root_irq_data->hwirq, root_irq_data);
1544 
1545 error:
1546         mutex_unlock(&irq_domain_mutex);
1547 
1548         return rv;
1549 }
1550 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1551 
1552 /**
1553  * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1554  * @domain:     Domain to remove.
1555  * @virq:       Irq to remove the domain from.
1556  *
1557  * Undo the effects of a call to irq_domain_push_irq().  Must be
1558  * called either before request_irq() or after free_irq().
1559  */
1560 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1561 {
1562         struct irq_data *root_irq_data = irq_get_irq_data(virq);
1563         struct irq_data *child_irq_data;
1564         struct irq_data *tmp_irq_data;
1565         struct irq_desc *desc;
1566 
1567         /*
1568          * Check that no action is set, which indicates the virq is in
1569          * a state where this function doesn't have to deal with races
1570          * between interrupt handling and maintaining the hierarchy.
1571          * This will catch gross misuse.  Attempting to make the check
1572          * race free would require holding locks across calls to
1573          * struct irq_domain_ops->free(), which could lead to
1574          * deadlock, so we just do a simple check before starting.
1575          */
1576         desc = irq_to_desc(virq);
1577         if (!desc)
1578                 return -EINVAL;
1579         if (WARN_ON(desc->action))
1580                 return -EBUSY;
1581 
1582         if (domain == NULL)
1583                 return -EINVAL;
1584 
1585         if (!root_irq_data)
1586                 return -EINVAL;
1587 
1588         tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1589 
1590         /* We can only "pop" if this domain is at the top of the list */
1591         if (WARN_ON(root_irq_data != tmp_irq_data))
1592                 return -EINVAL;
1593 
1594         if (WARN_ON(root_irq_data->domain != domain))
1595                 return -EINVAL;
1596 
1597         child_irq_data = root_irq_data->parent_data;
1598         if (WARN_ON(!child_irq_data))
1599                 return -EINVAL;
1600 
1601         mutex_lock(&irq_domain_mutex);
1602 
1603         root_irq_data->parent_data = NULL;
1604 
1605         irq_domain_clear_mapping(domain, root_irq_data->hwirq);
1606         irq_domain_free_irqs_hierarchy(domain, virq, 1);
1607 
1608         /* Restore the original irq_data. */
1609         *root_irq_data = *child_irq_data;
1610 
1611         irq_domain_fix_revmap(root_irq_data);
1612 
1613         mutex_unlock(&irq_domain_mutex);
1614 
1615         kfree(child_irq_data);
1616 
1617         return 0;
1618 }
1619 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1620 
1621 /**
1622  * irq_domain_free_irqs - Free IRQ number and associated data structures
1623  * @virq:       base IRQ number
1624  * @nr_irqs:    number of IRQs to free
1625  */
1626 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1627 {
1628         struct irq_data *data = irq_get_irq_data(virq);
1629         int i;
1630 
1631         if (WARN(!data || !data->domain || !data->domain->ops->free,
1632                  "NULL pointer, cannot free irq\n"))
1633                 return;
1634 
1635         mutex_lock(&irq_domain_mutex);
1636         for (i = 0; i < nr_irqs; i++)
1637                 irq_domain_remove_irq(virq + i);
1638         irq_domain_free_irqs_hierarchy(data->domain, virq, nr_irqs);
1639         mutex_unlock(&irq_domain_mutex);
1640 
1641         irq_domain_free_irq_data(virq, nr_irqs);
1642         irq_free_descs(virq, nr_irqs);
1643 }
1644 
1645 /**
1646  * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1647  * @irq_base:   Base IRQ number
1648  * @nr_irqs:    Number of IRQs to allocate
1649  * @arg:        Allocation data (arch/domain specific)
1650  *
1651  * Check whether the domain has been setup recursive. If not allocate
1652  * through the parent domain.
1653  */
1654 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1655                                  unsigned int irq_base, unsigned int nr_irqs,
1656                                  void *arg)
1657 {
1658         if (!domain->parent)
1659                 return -ENOSYS;
1660 
1661         return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1662                                                nr_irqs, arg);
1663 }
1664 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1665 
1666 /**
1667  * irq_domain_free_irqs_parent - Free interrupts from parent domain
1668  * @irq_base:   Base IRQ number
1669  * @nr_irqs:    Number of IRQs to free
1670  *
1671  * Check whether the domain has been setup recursive. If not free
1672  * through the parent domain.
1673  */
1674 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1675                                  unsigned int irq_base, unsigned int nr_irqs)
1676 {
1677         if (!domain->parent)
1678                 return;
1679 
1680         irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1681 }
1682 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1683 
1684 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1685 {
1686         if (irq_data && irq_data->domain) {
1687                 struct irq_domain *domain = irq_data->domain;
1688 
1689                 if (domain->ops->deactivate)
1690                         domain->ops->deactivate(domain, irq_data);
1691                 if (irq_data->parent_data)
1692                         __irq_domain_deactivate_irq(irq_data->parent_data);
1693         }
1694 }
1695 
1696 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1697 {
1698         int ret = 0;
1699 
1700         if (irqd && irqd->domain) {
1701                 struct irq_domain *domain = irqd->domain;
1702 
1703                 if (irqd->parent_data)
1704                         ret = __irq_domain_activate_irq(irqd->parent_data,
1705                                                         reserve);
1706                 if (!ret && domain->ops->activate) {
1707                         ret = domain->ops->activate(domain, irqd, reserve);
1708                         /* Rollback in case of error */
1709                         if (ret && irqd->parent_data)
1710                                 __irq_domain_deactivate_irq(irqd->parent_data);
1711                 }
1712         }
1713         return ret;
1714 }
1715 
1716 /**
1717  * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1718  *                           interrupt
1719  * @irq_data:   Outermost irq_data associated with interrupt
1720  * @reserve:    If set only reserve an interrupt vector instead of assigning one
1721  *
1722  * This is the second step to call domain_ops->activate to program interrupt
1723  * controllers, so the interrupt could actually get delivered.
1724  */
1725 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1726 {
1727         int ret = 0;
1728 
1729         if (!irqd_is_activated(irq_data))
1730                 ret = __irq_domain_activate_irq(irq_data, reserve);
1731         if (!ret)
1732                 irqd_set_activated(irq_data);
1733         return ret;
1734 }
1735 
1736 /**
1737  * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1738  *                             deactivate interrupt
1739  * @irq_data: outermost irq_data associated with interrupt
1740  *
1741  * It calls domain_ops->deactivate to program interrupt controllers to disable
1742  * interrupt delivery.
1743  */
1744 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1745 {
1746         if (irqd_is_activated(irq_data)) {
1747                 __irq_domain_deactivate_irq(irq_data);
1748                 irqd_clr_activated(irq_data);
1749         }
1750 }
1751 
1752 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1753 {
1754         /* Hierarchy irq_domains must implement callback alloc() */
1755         if (domain->ops->alloc)
1756                 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1757 }
1758 
1759 /**
1760  * irq_domain_hierarchical_is_msi_remap - Check if the domain or any
1761  * parent has MSI remapping support
1762  * @domain: domain pointer
1763  */
1764 bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
1765 {
1766         for (; domain; domain = domain->parent) {
1767                 if (irq_domain_is_msi_remap(domain))
1768                         return true;
1769         }
1770         return false;
1771 }
1772 #else   /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1773 /**
1774  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1775  * @domain:     domain to match
1776  * @virq:       IRQ number to get irq_data
1777  */
1778 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1779                                          unsigned int virq)
1780 {
1781         struct irq_data *irq_data = irq_get_irq_data(virq);
1782 
1783         return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1784 }
1785 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1786 
1787 /**
1788  * irq_domain_set_info - Set the complete data for a @virq in @domain
1789  * @domain:             Interrupt domain to match
1790  * @virq:               IRQ number
1791  * @hwirq:              The hardware interrupt number
1792  * @chip:               The associated interrupt chip
1793  * @chip_data:          The associated interrupt chip data
1794  * @handler:            The interrupt flow handler
1795  * @handler_data:       The interrupt flow handler data
1796  * @handler_name:       The interrupt handler name
1797  */
1798 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1799                          irq_hw_number_t hwirq, struct irq_chip *chip,
1800                          void *chip_data, irq_flow_handler_t handler,
1801                          void *handler_data, const char *handler_name)
1802 {
1803         irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1804         irq_set_chip_data(virq, chip_data);
1805         irq_set_handler_data(virq, handler_data);
1806 }
1807 
1808 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1809 {
1810 }
1811 #endif  /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1812 
1813 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1814 static struct dentry *domain_dir;
1815 
1816 static void
1817 irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1818 {
1819         seq_printf(m, "%*sname:   %s\n", ind, "", d->name);
1820         seq_printf(m, "%*ssize:   %u\n", ind + 1, "",
1821                    d->revmap_size + d->revmap_direct_max_irq);
1822         seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1823         seq_printf(m, "%*sflags:  0x%08x\n", ind +1 , "", d->flags);
1824         if (d->ops && d->ops->debug_show)
1825                 d->ops->debug_show(m, d, NULL, ind + 1);
1826 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
1827         if (!d->parent)
1828                 return;
1829         seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1830         irq_domain_debug_show_one(m, d->parent, ind + 4);
1831 #endif
1832 }
1833 
1834 static int irq_domain_debug_show(struct seq_file *m, void *p)
1835 {
1836         struct irq_domain *d = m->private;
1837 
1838         /* Default domain? Might be NULL */
1839         if (!d) {
1840                 if (!irq_default_domain)
1841                         return 0;
1842                 d = irq_default_domain;
1843         }
1844         irq_domain_debug_show_one(m, d, 0);
1845         return 0;
1846 }
1847 
1848 static int irq_domain_debug_open(struct inode *inode, struct file *file)
1849 {
1850         return single_open(file, irq_domain_debug_show, inode->i_private);
1851 }
1852 
1853 static const struct file_operations dfs_domain_ops = {
1854         .open           = irq_domain_debug_open,
1855         .read           = seq_read,
1856         .llseek         = seq_lseek,
1857         .release        = single_release,
1858 };
1859 
1860 static void debugfs_add_domain_dir(struct irq_domain *d)
1861 {
1862         if (!d->name || !domain_dir || d->debugfs_file)
1863                 return;
1864         d->debugfs_file = debugfs_create_file(d->name, 0444, domain_dir, d,
1865                                               &dfs_domain_ops);
1866 }
1867 
1868 static void debugfs_remove_domain_dir(struct irq_domain *d)
1869 {
1870         debugfs_remove(d->debugfs_file);
1871 }
1872 
1873 void __init irq_domain_debugfs_init(struct dentry *root)
1874 {
1875         struct irq_domain *d;
1876 
1877         domain_dir = debugfs_create_dir("domains", root);
1878         if (!domain_dir)
1879                 return;
1880 
1881         debugfs_create_file("default", 0444, domain_dir, NULL, &dfs_domain_ops);
1882         mutex_lock(&irq_domain_mutex);
1883         list_for_each_entry(d, &irq_domain_list, link)
1884                 debugfs_add_domain_dir(d);
1885         mutex_unlock(&irq_domain_mutex);
1886 }
1887 #endif
1888 

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