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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/debugfs.h>
  4 #include <linux/hardirq.h>
  5 #include <linux/interrupt.h>
  6 #include <linux/irq.h>
  7 #include <linux/irqdesc.h>
  8 #include <linux/irqdomain.h>
  9 #include <linux/module.h>
 10 #include <linux/mutex.h>
 11 #include <linux/of.h>
 12 #include <linux/of_address.h>
 13 #include <linux/of_irq.h>
 14 #include <linux/topology.h>
 15 #include <linux/seq_file.h>
 16 #include <linux/slab.h>
 17 #include <linux/smp.h>
 18 #include <linux/fs.h>
 19 
 20 static LIST_HEAD(irq_domain_list);
 21 static DEFINE_MUTEX(irq_domain_mutex);
 22 
 23 static DEFINE_MUTEX(revmap_trees_mutex);
 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         char *name;
 31         void *data;
 32 };
 33 
 34 /**
 35  * irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
 36  *                           identifying an irq domain
 37  * @data: optional user-provided data
 38  *
 39  * Allocate a struct device_node, and return a poiner to the embedded
 40  * fwnode_handle (or NULL on failure).
 41  */
 42 struct fwnode_handle *irq_domain_alloc_fwnode(void *data)
 43 {
 44         struct irqchip_fwid *fwid;
 45         char *name;
 46 
 47         fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
 48         name = kasprintf(GFP_KERNEL, "irqchip@%p", data);
 49 
 50         if (!fwid || !name) {
 51                 kfree(fwid);
 52                 kfree(name);
 53                 return NULL;
 54         }
 55 
 56         fwid->name = name;
 57         fwid->data = data;
 58         fwid->fwnode.type = FWNODE_IRQCHIP;
 59         return &fwid->fwnode;
 60 }
 61 EXPORT_SYMBOL_GPL(irq_domain_alloc_fwnode);
 62 
 63 /**
 64  * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
 65  *
 66  * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
 67  */
 68 void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
 69 {
 70         struct irqchip_fwid *fwid;
 71 
 72         if (WARN_ON(!is_fwnode_irqchip(fwnode)))
 73                 return;
 74 
 75         fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
 76         kfree(fwid->name);
 77         kfree(fwid);
 78 }
 79 EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
 80 
 81 /**
 82  * __irq_domain_add() - Allocate a new irq_domain data structure
 83  * @of_node: optional device-tree node of the interrupt controller
 84  * @size: Size of linear map; 0 for radix mapping only
 85  * @hwirq_max: Maximum number of interrupts supported by controller
 86  * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
 87  *              direct mapping
 88  * @ops: domain callbacks
 89  * @host_data: Controller private data pointer
 90  *
 91  * Allocates and initialize and irq_domain structure.
 92  * Returns pointer to IRQ domain, or NULL on failure.
 93  */
 94 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
 95                                     irq_hw_number_t hwirq_max, int direct_max,
 96                                     const struct irq_domain_ops *ops,
 97                                     void *host_data)
 98 {
 99         struct irq_domain *domain;
100         struct device_node *of_node;
101 
102         of_node = to_of_node(fwnode);
103 
104         domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
105                               GFP_KERNEL, of_node_to_nid(of_node));
106         if (WARN_ON(!domain))
107                 return NULL;
108 
109         of_node_get(of_node);
110 
111         /* Fill structure */
112         INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
113         domain->ops = ops;
114         domain->host_data = host_data;
115         domain->fwnode = fwnode;
116         domain->hwirq_max = hwirq_max;
117         domain->revmap_size = size;
118         domain->revmap_direct_max_irq = direct_max;
119         irq_domain_check_hierarchy(domain);
120 
121         mutex_lock(&irq_domain_mutex);
122         list_add(&domain->link, &irq_domain_list);
123         mutex_unlock(&irq_domain_mutex);
124 
125         pr_debug("Added domain %s\n", domain->name);
126         return domain;
127 }
128 EXPORT_SYMBOL_GPL(__irq_domain_add);
129 
130 /**
131  * irq_domain_remove() - Remove an irq domain.
132  * @domain: domain to remove
133  *
134  * This routine is used to remove an irq domain. The caller must ensure
135  * that all mappings within the domain have been disposed of prior to
136  * use, depending on the revmap type.
137  */
138 void irq_domain_remove(struct irq_domain *domain)
139 {
140         mutex_lock(&irq_domain_mutex);
141 
142         WARN_ON(!radix_tree_empty(&domain->revmap_tree));
143 
144         list_del(&domain->link);
145 
146         /*
147          * If the going away domain is the default one, reset it.
148          */
149         if (unlikely(irq_default_domain == domain))
150                 irq_set_default_host(NULL);
151 
152         mutex_unlock(&irq_domain_mutex);
153 
154         pr_debug("Removed domain %s\n", domain->name);
155 
156         of_node_put(irq_domain_get_of_node(domain));
157         kfree(domain);
158 }
159 EXPORT_SYMBOL_GPL(irq_domain_remove);
160 
161 /**
162  * irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
163  * @of_node: pointer to interrupt controller's device tree node.
164  * @size: total number of irqs in mapping
165  * @first_irq: first number of irq block assigned to the domain,
166  *      pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
167  *      pre-map all of the irqs in the domain to virqs starting at first_irq.
168  * @ops: domain callbacks
169  * @host_data: Controller private data pointer
170  *
171  * Allocates an irq_domain, and optionally if first_irq is positive then also
172  * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
173  *
174  * This is intended to implement the expected behaviour for most
175  * interrupt controllers. If device tree is used, then first_irq will be 0 and
176  * irqs get mapped dynamically on the fly. However, if the controller requires
177  * static virq assignments (non-DT boot) then it will set that up correctly.
178  */
179 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
180                                          unsigned int size,
181                                          unsigned int first_irq,
182                                          const struct irq_domain_ops *ops,
183                                          void *host_data)
184 {
185         struct irq_domain *domain;
186 
187         domain = __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
188         if (!domain)
189                 return NULL;
190 
191         if (first_irq > 0) {
192                 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
193                         /* attempt to allocated irq_descs */
194                         int rc = irq_alloc_descs(first_irq, first_irq, size,
195                                                  of_node_to_nid(of_node));
196                         if (rc < 0)
197                                 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
198                                         first_irq);
199                 }
200                 irq_domain_associate_many(domain, first_irq, 0, size);
201         }
202 
203         return domain;
204 }
205 EXPORT_SYMBOL_GPL(irq_domain_add_simple);
206 
207 /**
208  * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
209  * @of_node: pointer to interrupt controller's device tree node.
210  * @size: total number of irqs in legacy mapping
211  * @first_irq: first number of irq block assigned to the domain
212  * @first_hwirq: first hwirq number to use for the translation. Should normally
213  *               be '', but a positive integer can be used if the effective
214  *               hwirqs numbering does not begin at zero.
215  * @ops: map/unmap domain callbacks
216  * @host_data: Controller private data pointer
217  *
218  * Note: the map() callback will be called before this function returns
219  * for all legacy interrupts except 0 (which is always the invalid irq for
220  * a legacy controller).
221  */
222 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
223                                          unsigned int size,
224                                          unsigned int first_irq,
225                                          irq_hw_number_t first_hwirq,
226                                          const struct irq_domain_ops *ops,
227                                          void *host_data)
228 {
229         struct irq_domain *domain;
230 
231         domain = __irq_domain_add(of_node_to_fwnode(of_node), first_hwirq + size,
232                                   first_hwirq + size, 0, ops, host_data);
233         if (domain)
234                 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
235 
236         return domain;
237 }
238 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
239 
240 /**
241  * irq_find_matching_fwspec() - Locates a domain for a given fwspec
242  * @fwspec: FW specifier for an interrupt
243  * @bus_token: domain-specific data
244  */
245 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
246                                             enum irq_domain_bus_token bus_token)
247 {
248         struct irq_domain *h, *found = NULL;
249         struct fwnode_handle *fwnode = fwspec->fwnode;
250         int rc;
251 
252         /* We might want to match the legacy controller last since
253          * it might potentially be set to match all interrupts in
254          * the absence of a device node. This isn't a problem so far
255          * yet though...
256          *
257          * bus_token == DOMAIN_BUS_ANY matches any domain, any other
258          * values must generate an exact match for the domain to be
259          * selected.
260          */
261         mutex_lock(&irq_domain_mutex);
262         list_for_each_entry(h, &irq_domain_list, link) {
263                 if (h->ops->select && fwspec->param_count)
264                         rc = h->ops->select(h, fwspec, bus_token);
265                 else if (h->ops->match)
266                         rc = h->ops->match(h, to_of_node(fwnode), bus_token);
267                 else
268                         rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
269                               ((bus_token == DOMAIN_BUS_ANY) ||
270                                (h->bus_token == bus_token)));
271 
272                 if (rc) {
273                         found = h;
274                         break;
275                 }
276         }
277         mutex_unlock(&irq_domain_mutex);
278         return found;
279 }
280 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
281 
282 /**
283  * irq_set_default_host() - Set a "default" irq domain
284  * @domain: default domain pointer
285  *
286  * For convenience, it's possible to set a "default" domain that will be used
287  * whenever NULL is passed to irq_create_mapping(). It makes life easier for
288  * platforms that want to manipulate a few hard coded interrupt numbers that
289  * aren't properly represented in the device-tree.
290  */
291 void irq_set_default_host(struct irq_domain *domain)
292 {
293         pr_debug("Default domain set to @0x%p\n", domain);
294 
295         irq_default_domain = domain;
296 }
297 EXPORT_SYMBOL_GPL(irq_set_default_host);
298 
299 void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
300 {
301         struct irq_data *irq_data = irq_get_irq_data(irq);
302         irq_hw_number_t hwirq;
303 
304         if (WARN(!irq_data || irq_data->domain != domain,
305                  "virq%i doesn't exist; cannot disassociate\n", irq))
306                 return;
307 
308         hwirq = irq_data->hwirq;
309         irq_set_status_flags(irq, IRQ_NOREQUEST);
310 
311         /* remove chip and handler */
312         irq_set_chip_and_handler(irq, NULL, NULL);
313 
314         /* Make sure it's completed */
315         synchronize_irq(irq);
316 
317         /* Tell the PIC about it */
318         if (domain->ops->unmap)
319                 domain->ops->unmap(domain, irq);
320         smp_mb();
321 
322         irq_data->domain = NULL;
323         irq_data->hwirq = 0;
324 
325         /* Clear reverse map for this hwirq */
326         if (hwirq < domain->revmap_size) {
327                 domain->linear_revmap[hwirq] = 0;
328         } else {
329                 mutex_lock(&revmap_trees_mutex);
330                 radix_tree_delete(&domain->revmap_tree, hwirq);
331                 mutex_unlock(&revmap_trees_mutex);
332         }
333 }
334 
335 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
336                          irq_hw_number_t hwirq)
337 {
338         struct irq_data *irq_data = irq_get_irq_data(virq);
339         int ret;
340 
341         if (WARN(hwirq >= domain->hwirq_max,
342                  "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
343                 return -EINVAL;
344         if (WARN(!irq_data, "error: virq%i is not allocated", virq))
345                 return -EINVAL;
346         if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
347                 return -EINVAL;
348 
349         mutex_lock(&irq_domain_mutex);
350         irq_data->hwirq = hwirq;
351         irq_data->domain = domain;
352         if (domain->ops->map) {
353                 ret = domain->ops->map(domain, virq, hwirq);
354                 if (ret != 0) {
355                         /*
356                          * If map() returns -EPERM, this interrupt is protected
357                          * by the firmware or some other service and shall not
358                          * be mapped. Don't bother telling the user about it.
359                          */
360                         if (ret != -EPERM) {
361                                 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
362                                        domain->name, hwirq, virq, ret);
363                         }
364                         irq_data->domain = NULL;
365                         irq_data->hwirq = 0;
366                         mutex_unlock(&irq_domain_mutex);
367                         return ret;
368                 }
369 
370                 /* If not already assigned, give the domain the chip's name */
371                 if (!domain->name && irq_data->chip)
372                         domain->name = irq_data->chip->name;
373         }
374 
375         if (hwirq < domain->revmap_size) {
376                 domain->linear_revmap[hwirq] = virq;
377         } else {
378                 mutex_lock(&revmap_trees_mutex);
379                 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
380                 mutex_unlock(&revmap_trees_mutex);
381         }
382         mutex_unlock(&irq_domain_mutex);
383 
384         irq_clear_status_flags(virq, IRQ_NOREQUEST);
385 
386         return 0;
387 }
388 EXPORT_SYMBOL_GPL(irq_domain_associate);
389 
390 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
391                                irq_hw_number_t hwirq_base, int count)
392 {
393         struct device_node *of_node;
394         int i;
395 
396         of_node = irq_domain_get_of_node(domain);
397         pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
398                 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
399 
400         for (i = 0; i < count; i++) {
401                 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
402         }
403 }
404 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
405 
406 /**
407  * irq_create_direct_mapping() - Allocate an irq for direct mapping
408  * @domain: domain to allocate the irq for or NULL for default domain
409  *
410  * This routine is used for irq controllers which can choose the hardware
411  * interrupt numbers they generate. In such a case it's simplest to use
412  * the linux irq as the hardware interrupt number. It still uses the linear
413  * or radix tree to store the mapping, but the irq controller can optimize
414  * the revmap path by using the hwirq directly.
415  */
416 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
417 {
418         struct device_node *of_node;
419         unsigned int virq;
420 
421         if (domain == NULL)
422                 domain = irq_default_domain;
423 
424         of_node = irq_domain_get_of_node(domain);
425         virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
426         if (!virq) {
427                 pr_debug("create_direct virq allocation failed\n");
428                 return 0;
429         }
430         if (virq >= domain->revmap_direct_max_irq) {
431                 pr_err("ERROR: no free irqs available below %i maximum\n",
432                         domain->revmap_direct_max_irq);
433                 irq_free_desc(virq);
434                 return 0;
435         }
436         pr_debug("create_direct obtained virq %d\n", virq);
437 
438         if (irq_domain_associate(domain, virq, virq)) {
439                 irq_free_desc(virq);
440                 return 0;
441         }
442 
443         return virq;
444 }
445 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
446 
447 /**
448  * irq_create_mapping() - Map a hardware interrupt into linux irq space
449  * @domain: domain owning this hardware interrupt or NULL for default domain
450  * @hwirq: hardware irq number in that domain space
451  *
452  * Only one mapping per hardware interrupt is permitted. Returns a linux
453  * irq number.
454  * If the sense/trigger is to be specified, set_irq_type() should be called
455  * on the number returned from that call.
456  */
457 unsigned int irq_create_mapping(struct irq_domain *domain,
458                                 irq_hw_number_t hwirq)
459 {
460         struct device_node *of_node;
461         int virq;
462 
463         pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
464 
465         /* Look for default domain if nececssary */
466         if (domain == NULL)
467                 domain = irq_default_domain;
468         if (domain == NULL) {
469                 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
470                 return 0;
471         }
472         pr_debug("-> using domain @%p\n", domain);
473 
474         of_node = irq_domain_get_of_node(domain);
475 
476         /* Check if mapping already exists */
477         virq = irq_find_mapping(domain, hwirq);
478         if (virq) {
479                 pr_debug("-> existing mapping on virq %d\n", virq);
480                 return virq;
481         }
482 
483         /* Allocate a virtual interrupt number */
484         virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node));
485         if (virq <= 0) {
486                 pr_debug("-> virq allocation failed\n");
487                 return 0;
488         }
489 
490         if (irq_domain_associate(domain, virq, hwirq)) {
491                 irq_free_desc(virq);
492                 return 0;
493         }
494 
495         pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
496                 hwirq, of_node_full_name(of_node), virq);
497 
498         return virq;
499 }
500 EXPORT_SYMBOL_GPL(irq_create_mapping);
501 
502 /**
503  * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
504  * @domain: domain owning the interrupt range
505  * @irq_base: beginning of linux IRQ range
506  * @hwirq_base: beginning of hardware IRQ range
507  * @count: Number of interrupts to map
508  *
509  * This routine is used for allocating and mapping a range of hardware
510  * irqs to linux irqs where the linux irq numbers are at pre-defined
511  * locations. For use by controllers that already have static mappings
512  * to insert in to the domain.
513  *
514  * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
515  * domain insertion.
516  *
517  * 0 is returned upon success, while any failure to establish a static
518  * mapping is treated as an error.
519  */
520 int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
521                                irq_hw_number_t hwirq_base, int count)
522 {
523         struct device_node *of_node;
524         int ret;
525 
526         of_node = irq_domain_get_of_node(domain);
527         ret = irq_alloc_descs(irq_base, irq_base, count,
528                               of_node_to_nid(of_node));
529         if (unlikely(ret < 0))
530                 return ret;
531 
532         irq_domain_associate_many(domain, irq_base, hwirq_base, count);
533         return 0;
534 }
535 EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
536 
537 static int irq_domain_translate(struct irq_domain *d,
538                                 struct irq_fwspec *fwspec,
539                                 irq_hw_number_t *hwirq, unsigned int *type)
540 {
541 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
542         if (d->ops->translate)
543                 return d->ops->translate(d, fwspec, hwirq, type);
544 #endif
545         if (d->ops->xlate)
546                 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
547                                      fwspec->param, fwspec->param_count,
548                                      hwirq, type);
549 
550         /* If domain has no translation, then we assume interrupt line */
551         *hwirq = fwspec->param[0];
552         return 0;
553 }
554 
555 static void of_phandle_args_to_fwspec(struct of_phandle_args *irq_data,
556                                       struct irq_fwspec *fwspec)
557 {
558         int i;
559 
560         fwspec->fwnode = irq_data->np ? &irq_data->np->fwnode : NULL;
561         fwspec->param_count = irq_data->args_count;
562 
563         for (i = 0; i < irq_data->args_count; i++)
564                 fwspec->param[i] = irq_data->args[i];
565 }
566 
567 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
568 {
569         struct irq_domain *domain;
570         irq_hw_number_t hwirq;
571         unsigned int type = IRQ_TYPE_NONE;
572         int virq;
573 
574         if (fwspec->fwnode) {
575                 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
576                 if (!domain)
577                         domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
578         } else {
579                 domain = irq_default_domain;
580         }
581 
582         if (!domain) {
583                 pr_warn("no irq domain found for %s !\n",
584                         of_node_full_name(to_of_node(fwspec->fwnode)));
585                 return 0;
586         }
587 
588         if (irq_domain_translate(domain, fwspec, &hwirq, &type))
589                 return 0;
590 
591         if (irq_domain_is_hierarchy(domain)) {
592                 /*
593                  * If we've already configured this interrupt,
594                  * don't do it again, or hell will break loose.
595                  */
596                 virq = irq_find_mapping(domain, hwirq);
597                 if (virq)
598                         return virq;
599 
600                 virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
601                 if (virq <= 0)
602                         return 0;
603         } else {
604                 /* Create mapping */
605                 virq = irq_create_mapping(domain, hwirq);
606                 if (!virq)
607                         return virq;
608         }
609 
610         /* Set type if specified and different than the current one */
611         if (type != IRQ_TYPE_NONE &&
612             type != irq_get_trigger_type(virq))
613                 irq_set_irq_type(virq, type);
614         return virq;
615 }
616 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
617 
618 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
619 {
620         struct irq_fwspec fwspec;
621 
622         of_phandle_args_to_fwspec(irq_data, &fwspec);
623         return irq_create_fwspec_mapping(&fwspec);
624 }
625 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
626 
627 /**
628  * irq_dispose_mapping() - Unmap an interrupt
629  * @virq: linux irq number of the interrupt to unmap
630  */
631 void irq_dispose_mapping(unsigned int virq)
632 {
633         struct irq_data *irq_data = irq_get_irq_data(virq);
634         struct irq_domain *domain;
635 
636         if (!virq || !irq_data)
637                 return;
638 
639         domain = irq_data->domain;
640         if (WARN_ON(domain == NULL))
641                 return;
642 
643         irq_domain_disassociate(domain, virq);
644         irq_free_desc(virq);
645 }
646 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
647 
648 /**
649  * irq_find_mapping() - Find a linux irq from an hw irq number.
650  * @domain: domain owning this hardware interrupt
651  * @hwirq: hardware irq number in that domain space
652  */
653 unsigned int irq_find_mapping(struct irq_domain *domain,
654                               irq_hw_number_t hwirq)
655 {
656         struct irq_data *data;
657 
658         /* Look for default domain if nececssary */
659         if (domain == NULL)
660                 domain = irq_default_domain;
661         if (domain == NULL)
662                 return 0;
663 
664         if (hwirq < domain->revmap_direct_max_irq) {
665                 data = irq_domain_get_irq_data(domain, hwirq);
666                 if (data && data->hwirq == hwirq)
667                         return hwirq;
668         }
669 
670         /* Check if the hwirq is in the linear revmap. */
671         if (hwirq < domain->revmap_size)
672                 return domain->linear_revmap[hwirq];
673 
674         rcu_read_lock();
675         data = radix_tree_lookup(&domain->revmap_tree, hwirq);
676         rcu_read_unlock();
677         return data ? data->irq : 0;
678 }
679 EXPORT_SYMBOL_GPL(irq_find_mapping);
680 
681 #ifdef CONFIG_IRQ_DOMAIN_DEBUG
682 static int virq_debug_show(struct seq_file *m, void *private)
683 {
684         unsigned long flags;
685         struct irq_desc *desc;
686         struct irq_domain *domain;
687         struct radix_tree_iter iter;
688         void *data, **slot;
689         int i;
690 
691         seq_printf(m, " %-16s  %-6s  %-10s  %-10s  %s\n",
692                    "name", "mapped", "linear-max", "direct-max", "devtree-node");
693         mutex_lock(&irq_domain_mutex);
694         list_for_each_entry(domain, &irq_domain_list, link) {
695                 struct device_node *of_node;
696                 int count = 0;
697                 of_node = irq_domain_get_of_node(domain);
698                 radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0)
699                         count++;
700                 seq_printf(m, "%c%-16s  %6u  %10u  %10u  %s\n",
701                            domain == irq_default_domain ? '*' : ' ', domain->name,
702                            domain->revmap_size + count, domain->revmap_size,
703                            domain->revmap_direct_max_irq,
704                            of_node ? of_node_full_name(of_node) : "");
705         }
706         mutex_unlock(&irq_domain_mutex);
707 
708         seq_printf(m, "%-5s  %-7s  %-15s  %-*s  %6s  %-14s  %s\n", "irq", "hwirq",
709                       "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
710                       "active", "type", "domain");
711 
712         for (i = 1; i < nr_irqs; i++) {
713                 desc = irq_to_desc(i);
714                 if (!desc)
715                         continue;
716 
717                 raw_spin_lock_irqsave(&desc->lock, flags);
718                 domain = desc->irq_data.domain;
719 
720                 if (domain) {
721                         struct irq_chip *chip;
722                         int hwirq = desc->irq_data.hwirq;
723                         bool direct;
724 
725                         seq_printf(m, "%5d  ", i);
726                         seq_printf(m, "0x%05x  ", hwirq);
727 
728                         chip = irq_desc_get_chip(desc);
729                         seq_printf(m, "%-15s  ", (chip && chip->name) ? chip->name : "none");
730 
731                         data = irq_desc_get_chip_data(desc);
732                         seq_printf(m, data ? "0x%p  " : "  %p  ", data);
733 
734                         seq_printf(m, "   %c    ", (desc->action && desc->action->handler) ? '*' : ' ');
735                         direct = (i == hwirq) && (i < domain->revmap_direct_max_irq);
736                         seq_printf(m, "%6s%-8s  ",
737                                    (hwirq < domain->revmap_size) ? "LINEAR" : "RADIX",
738                                    direct ? "(DIRECT)" : "");
739                         seq_printf(m, "%s\n", desc->irq_data.domain->name);
740                 }
741 
742                 raw_spin_unlock_irqrestore(&desc->lock, flags);
743         }
744 
745         return 0;
746 }
747 
748 static int virq_debug_open(struct inode *inode, struct file *file)
749 {
750         return single_open(file, virq_debug_show, inode->i_private);
751 }
752 
753 static const struct file_operations virq_debug_fops = {
754         .open = virq_debug_open,
755         .read = seq_read,
756         .llseek = seq_lseek,
757         .release = single_release,
758 };
759 
760 static int __init irq_debugfs_init(void)
761 {
762         if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
763                                  NULL, &virq_debug_fops) == NULL)
764                 return -ENOMEM;
765 
766         return 0;
767 }
768 __initcall(irq_debugfs_init);
769 #endif /* CONFIG_IRQ_DOMAIN_DEBUG */
770 
771 /**
772  * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
773  *
774  * Device Tree IRQ specifier translation function which works with one cell
775  * bindings where the cell value maps directly to the hwirq number.
776  */
777 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
778                              const u32 *intspec, unsigned int intsize,
779                              unsigned long *out_hwirq, unsigned int *out_type)
780 {
781         if (WARN_ON(intsize < 1))
782                 return -EINVAL;
783         *out_hwirq = intspec[0];
784         *out_type = IRQ_TYPE_NONE;
785         return 0;
786 }
787 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
788 
789 /**
790  * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
791  *
792  * Device Tree IRQ specifier translation function which works with two cell
793  * bindings where the cell values map directly to the hwirq number
794  * and linux irq flags.
795  */
796 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
797                         const u32 *intspec, unsigned int intsize,
798                         irq_hw_number_t *out_hwirq, unsigned int *out_type)
799 {
800         if (WARN_ON(intsize < 2))
801                 return -EINVAL;
802         *out_hwirq = intspec[0];
803         *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
804         return 0;
805 }
806 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
807 
808 /**
809  * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
810  *
811  * Device Tree IRQ specifier translation function which works with either one
812  * or two cell bindings where the cell values map directly to the hwirq number
813  * and linux irq flags.
814  *
815  * Note: don't use this function unless your interrupt controller explicitly
816  * supports both one and two cell bindings.  For the majority of controllers
817  * the _onecell() or _twocell() variants above should be used.
818  */
819 int irq_domain_xlate_onetwocell(struct irq_domain *d,
820                                 struct device_node *ctrlr,
821                                 const u32 *intspec, unsigned int intsize,
822                                 unsigned long *out_hwirq, unsigned int *out_type)
823 {
824         if (WARN_ON(intsize < 1))
825                 return -EINVAL;
826         *out_hwirq = intspec[0];
827         *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
828         return 0;
829 }
830 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
831 
832 const struct irq_domain_ops irq_domain_simple_ops = {
833         .xlate = irq_domain_xlate_onetwocell,
834 };
835 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
836 
837 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
838                            int node)
839 {
840         unsigned int hint;
841 
842         if (virq >= 0) {
843                 virq = irq_alloc_descs(virq, virq, cnt, node);
844         } else {
845                 hint = hwirq % nr_irqs;
846                 if (hint == 0)
847                         hint++;
848                 virq = irq_alloc_descs_from(hint, cnt, node);
849                 if (virq <= 0 && hint > 1)
850                         virq = irq_alloc_descs_from(1, cnt, node);
851         }
852 
853         return virq;
854 }
855 
856 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
857 /**
858  * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
859  * @parent:     Parent irq domain to associate with the new domain
860  * @flags:      Irq domain flags associated to the domain
861  * @size:       Size of the domain. See below
862  * @fwnode:     Optional fwnode of the interrupt controller
863  * @ops:        Pointer to the interrupt domain callbacks
864  * @host_data:  Controller private data pointer
865  *
866  * If @size is 0 a tree domain is created, otherwise a linear domain.
867  *
868  * If successful the parent is associated to the new domain and the
869  * domain flags are set.
870  * Returns pointer to IRQ domain, or NULL on failure.
871  */
872 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
873                                             unsigned int flags,
874                                             unsigned int size,
875                                             struct fwnode_handle *fwnode,
876                                             const struct irq_domain_ops *ops,
877                                             void *host_data)
878 {
879         struct irq_domain *domain;
880 
881         if (size)
882                 domain = irq_domain_create_linear(fwnode, size, ops, host_data);
883         else
884                 domain = irq_domain_create_tree(fwnode, ops, host_data);
885         if (domain) {
886                 domain->parent = parent;
887                 domain->flags |= flags;
888         }
889 
890         return domain;
891 }
892 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
893 
894 static void irq_domain_insert_irq(int virq)
895 {
896         struct irq_data *data;
897 
898         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
899                 struct irq_domain *domain = data->domain;
900                 irq_hw_number_t hwirq = data->hwirq;
901 
902                 if (hwirq < domain->revmap_size) {
903                         domain->linear_revmap[hwirq] = virq;
904                 } else {
905                         mutex_lock(&revmap_trees_mutex);
906                         radix_tree_insert(&domain->revmap_tree, hwirq, data);
907                         mutex_unlock(&revmap_trees_mutex);
908                 }
909 
910                 /* If not already assigned, give the domain the chip's name */
911                 if (!domain->name && data->chip)
912                         domain->name = data->chip->name;
913         }
914 
915         irq_clear_status_flags(virq, IRQ_NOREQUEST);
916 }
917 
918 static void irq_domain_remove_irq(int virq)
919 {
920         struct irq_data *data;
921 
922         irq_set_status_flags(virq, IRQ_NOREQUEST);
923         irq_set_chip_and_handler(virq, NULL, NULL);
924         synchronize_irq(virq);
925         smp_mb();
926 
927         for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
928                 struct irq_domain *domain = data->domain;
929                 irq_hw_number_t hwirq = data->hwirq;
930 
931                 if (hwirq < domain->revmap_size) {
932                         domain->linear_revmap[hwirq] = 0;
933                 } else {
934                         mutex_lock(&revmap_trees_mutex);
935                         radix_tree_delete(&domain->revmap_tree, hwirq);
936                         mutex_unlock(&revmap_trees_mutex);
937                 }
938         }
939 }
940 
941 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
942                                                    struct irq_data *child)
943 {
944         struct irq_data *irq_data;
945 
946         irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
947                                 irq_data_get_node(child));
948         if (irq_data) {
949                 child->parent_data = irq_data;
950                 irq_data->irq = child->irq;
951                 irq_data->common = child->common;
952                 irq_data->domain = domain;
953         }
954 
955         return irq_data;
956 }
957 
958 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
959 {
960         struct irq_data *irq_data, *tmp;
961         int i;
962 
963         for (i = 0; i < nr_irqs; i++) {
964                 irq_data = irq_get_irq_data(virq + i);
965                 tmp = irq_data->parent_data;
966                 irq_data->parent_data = NULL;
967                 irq_data->domain = NULL;
968 
969                 while (tmp) {
970                         irq_data = tmp;
971                         tmp = tmp->parent_data;
972                         kfree(irq_data);
973                 }
974         }
975 }
976 
977 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
978                                      unsigned int virq, unsigned int nr_irqs)
979 {
980         struct irq_data *irq_data;
981         struct irq_domain *parent;
982         int i;
983 
984         /* The outermost irq_data is embedded in struct irq_desc */
985         for (i = 0; i < nr_irqs; i++) {
986                 irq_data = irq_get_irq_data(virq + i);
987                 irq_data->domain = domain;
988 
989                 for (parent = domain->parent; parent; parent = parent->parent) {
990                         irq_data = irq_domain_insert_irq_data(parent, irq_data);
991                         if (!irq_data) {
992                                 irq_domain_free_irq_data(virq, i + 1);
993                                 return -ENOMEM;
994                         }
995                 }
996         }
997 
998         return 0;
999 }
1000 
1001 /**
1002  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1003  * @domain:     domain to match
1004  * @virq:       IRQ number to get irq_data
1005  */
1006 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1007                                          unsigned int virq)
1008 {
1009         struct irq_data *irq_data;
1010 
1011         for (irq_data = irq_get_irq_data(virq); irq_data;
1012              irq_data = irq_data->parent_data)
1013                 if (irq_data->domain == domain)
1014                         return irq_data;
1015 
1016         return NULL;
1017 }
1018 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1019 
1020 /**
1021  * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1022  * @domain:     Interrupt domain to match
1023  * @virq:       IRQ number
1024  * @hwirq:      The hwirq number
1025  * @chip:       The associated interrupt chip
1026  * @chip_data:  The associated chip data
1027  */
1028 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1029                                   irq_hw_number_t hwirq, struct irq_chip *chip,
1030                                   void *chip_data)
1031 {
1032         struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1033 
1034         if (!irq_data)
1035                 return -ENOENT;
1036 
1037         irq_data->hwirq = hwirq;
1038         irq_data->chip = chip ? chip : &no_irq_chip;
1039         irq_data->chip_data = chip_data;
1040 
1041         return 0;
1042 }
1043 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1044 
1045 /**
1046  * irq_domain_set_info - Set the complete data for a @virq in @domain
1047  * @domain:             Interrupt domain to match
1048  * @virq:               IRQ number
1049  * @hwirq:              The hardware interrupt number
1050  * @chip:               The associated interrupt chip
1051  * @chip_data:          The associated interrupt chip data
1052  * @handler:            The interrupt flow handler
1053  * @handler_data:       The interrupt flow handler data
1054  * @handler_name:       The interrupt handler name
1055  */
1056 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1057                          irq_hw_number_t hwirq, struct irq_chip *chip,
1058                          void *chip_data, irq_flow_handler_t handler,
1059                          void *handler_data, const char *handler_name)
1060 {
1061         irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1062         __irq_set_handler(virq, handler, 0, handler_name);
1063         irq_set_handler_data(virq, handler_data);
1064 }
1065 EXPORT_SYMBOL(irq_domain_set_info);
1066 
1067 /**
1068  * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1069  * @irq_data:   The pointer to irq_data
1070  */
1071 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1072 {
1073         irq_data->hwirq = 0;
1074         irq_data->chip = &no_irq_chip;
1075         irq_data->chip_data = NULL;
1076 }
1077 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1078 
1079 /**
1080  * irq_domain_free_irqs_common - Clear irq_data and free the parent
1081  * @domain:     Interrupt domain to match
1082  * @virq:       IRQ number to start with
1083  * @nr_irqs:    The number of irqs to free
1084  */
1085 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1086                                  unsigned int nr_irqs)
1087 {
1088         struct irq_data *irq_data;
1089         int i;
1090 
1091         for (i = 0; i < nr_irqs; i++) {
1092                 irq_data = irq_domain_get_irq_data(domain, virq + i);
1093                 if (irq_data)
1094                         irq_domain_reset_irq_data(irq_data);
1095         }
1096         irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1097 }
1098 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1099 
1100 /**
1101  * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1102  * @domain:     Interrupt domain to match
1103  * @virq:       IRQ number to start with
1104  * @nr_irqs:    The number of irqs to free
1105  */
1106 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1107                               unsigned int nr_irqs)
1108 {
1109         int i;
1110 
1111         for (i = 0; i < nr_irqs; i++) {
1112                 irq_set_handler_data(virq + i, NULL);
1113                 irq_set_handler(virq + i, NULL);
1114         }
1115         irq_domain_free_irqs_common(domain, virq, nr_irqs);
1116 }
1117 
1118 static bool irq_domain_is_auto_recursive(struct irq_domain *domain)
1119 {
1120         return domain->flags & IRQ_DOMAIN_FLAG_AUTO_RECURSIVE;
1121 }
1122 
1123 static void irq_domain_free_irqs_recursive(struct irq_domain *domain,
1124                                            unsigned int irq_base,
1125                                            unsigned int nr_irqs)
1126 {
1127         domain->ops->free(domain, irq_base, nr_irqs);
1128         if (irq_domain_is_auto_recursive(domain)) {
1129                 BUG_ON(!domain->parent);
1130                 irq_domain_free_irqs_recursive(domain->parent, irq_base,
1131                                                nr_irqs);
1132         }
1133 }
1134 
1135 int irq_domain_alloc_irqs_recursive(struct irq_domain *domain,
1136                                     unsigned int irq_base,
1137                                     unsigned int nr_irqs, void *arg)
1138 {
1139         int ret = 0;
1140         struct irq_domain *parent = domain->parent;
1141         bool recursive = irq_domain_is_auto_recursive(domain);
1142 
1143         BUG_ON(recursive && !parent);
1144         if (recursive)
1145                 ret = irq_domain_alloc_irqs_recursive(parent, irq_base,
1146                                                       nr_irqs, arg);
1147         if (ret >= 0)
1148                 ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1149         if (ret < 0 && recursive)
1150                 irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs);
1151 
1152         return ret;
1153 }
1154 
1155 /**
1156  * __irq_domain_alloc_irqs - Allocate IRQs from domain
1157  * @domain:     domain to allocate from
1158  * @irq_base:   allocate specified IRQ nubmer if irq_base >= 0
1159  * @nr_irqs:    number of IRQs to allocate
1160  * @node:       NUMA node id for memory allocation
1161  * @arg:        domain specific argument
1162  * @realloc:    IRQ descriptors have already been allocated if true
1163  *
1164  * Allocate IRQ numbers and initialized all data structures to support
1165  * hierarchy IRQ domains.
1166  * Parameter @realloc is mainly to support legacy IRQs.
1167  * Returns error code or allocated IRQ number
1168  *
1169  * The whole process to setup an IRQ has been split into two steps.
1170  * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1171  * descriptor and required hardware resources. The second step,
1172  * irq_domain_activate_irq(), is to program hardwares with preallocated
1173  * resources. In this way, it's easier to rollback when failing to
1174  * allocate resources.
1175  */
1176 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1177                             unsigned int nr_irqs, int node, void *arg,
1178                             bool realloc)
1179 {
1180         int i, ret, virq;
1181 
1182         if (domain == NULL) {
1183                 domain = irq_default_domain;
1184                 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1185                         return -EINVAL;
1186         }
1187 
1188         if (!domain->ops->alloc) {
1189                 pr_debug("domain->ops->alloc() is NULL\n");
1190                 return -ENOSYS;
1191         }
1192 
1193         if (realloc && irq_base >= 0) {
1194                 virq = irq_base;
1195         } else {
1196                 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node);
1197                 if (virq < 0) {
1198                         pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1199                                  irq_base, nr_irqs);
1200                         return virq;
1201                 }
1202         }
1203 
1204         if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1205                 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1206                 ret = -ENOMEM;
1207                 goto out_free_desc;
1208         }
1209 
1210         mutex_lock(&irq_domain_mutex);
1211         ret = irq_domain_alloc_irqs_recursive(domain, virq, nr_irqs, arg);
1212         if (ret < 0) {
1213                 mutex_unlock(&irq_domain_mutex);
1214                 goto out_free_irq_data;
1215         }
1216         for (i = 0; i < nr_irqs; i++)
1217                 irq_domain_insert_irq(virq + i);
1218         mutex_unlock(&irq_domain_mutex);
1219 
1220         return virq;
1221 
1222 out_free_irq_data:
1223         irq_domain_free_irq_data(virq, nr_irqs);
1224 out_free_desc:
1225         irq_free_descs(virq, nr_irqs);
1226         return ret;
1227 }
1228 
1229 /**
1230  * irq_domain_free_irqs - Free IRQ number and associated data structures
1231  * @virq:       base IRQ number
1232  * @nr_irqs:    number of IRQs to free
1233  */
1234 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1235 {
1236         struct irq_data *data = irq_get_irq_data(virq);
1237         int i;
1238 
1239         if (WARN(!data || !data->domain || !data->domain->ops->free,
1240                  "NULL pointer, cannot free irq\n"))
1241                 return;
1242 
1243         mutex_lock(&irq_domain_mutex);
1244         for (i = 0; i < nr_irqs; i++)
1245                 irq_domain_remove_irq(virq + i);
1246         irq_domain_free_irqs_recursive(data->domain, virq, nr_irqs);
1247         mutex_unlock(&irq_domain_mutex);
1248 
1249         irq_domain_free_irq_data(virq, nr_irqs);
1250         irq_free_descs(virq, nr_irqs);
1251 }
1252 
1253 /**
1254  * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1255  * @irq_base:   Base IRQ number
1256  * @nr_irqs:    Number of IRQs to allocate
1257  * @arg:        Allocation data (arch/domain specific)
1258  *
1259  * Check whether the domain has been setup recursive. If not allocate
1260  * through the parent domain.
1261  */
1262 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1263                                  unsigned int irq_base, unsigned int nr_irqs,
1264                                  void *arg)
1265 {
1266         /* irq_domain_alloc_irqs_recursive() has called parent's alloc() */
1267         if (irq_domain_is_auto_recursive(domain))
1268                 return 0;
1269 
1270         domain = domain->parent;
1271         if (domain)
1272                 return irq_domain_alloc_irqs_recursive(domain, irq_base,
1273                                                        nr_irqs, arg);
1274         return -ENOSYS;
1275 }
1276 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1277 
1278 /**
1279  * irq_domain_free_irqs_parent - Free interrupts from parent domain
1280  * @irq_base:   Base IRQ number
1281  * @nr_irqs:    Number of IRQs to free
1282  *
1283  * Check whether the domain has been setup recursive. If not free
1284  * through the parent domain.
1285  */
1286 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1287                                  unsigned int irq_base, unsigned int nr_irqs)
1288 {
1289         /* irq_domain_free_irqs_recursive() will call parent's free */
1290         if (!irq_domain_is_auto_recursive(domain) && domain->parent)
1291                 irq_domain_free_irqs_recursive(domain->parent, irq_base,
1292                                                nr_irqs);
1293 }
1294 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1295 
1296 /**
1297  * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1298  *                           interrupt
1299  * @irq_data:   outermost irq_data associated with interrupt
1300  *
1301  * This is the second step to call domain_ops->activate to program interrupt
1302  * controllers, so the interrupt could actually get delivered.
1303  */
1304 void irq_domain_activate_irq(struct irq_data *irq_data)
1305 {
1306         if (irq_data && irq_data->domain) {
1307                 struct irq_domain *domain = irq_data->domain;
1308 
1309                 if (irq_data->parent_data)
1310                         irq_domain_activate_irq(irq_data->parent_data);
1311                 if (domain->ops->activate)
1312                         domain->ops->activate(domain, irq_data);
1313         }
1314 }
1315 
1316 /**
1317  * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1318  *                             deactivate interrupt
1319  * @irq_data: outermost irq_data associated with interrupt
1320  *
1321  * It calls domain_ops->deactivate to program interrupt controllers to disable
1322  * interrupt delivery.
1323  */
1324 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1325 {
1326         if (irq_data && irq_data->domain) {
1327                 struct irq_domain *domain = irq_data->domain;
1328 
1329                 if (domain->ops->deactivate)
1330                         domain->ops->deactivate(domain, irq_data);
1331                 if (irq_data->parent_data)
1332                         irq_domain_deactivate_irq(irq_data->parent_data);
1333         }
1334 }
1335 
1336 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1337 {
1338         /* Hierarchy irq_domains must implement callback alloc() */
1339         if (domain->ops->alloc)
1340                 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1341 }
1342 #else   /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1343 /**
1344  * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1345  * @domain:     domain to match
1346  * @virq:       IRQ number to get irq_data
1347  */
1348 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1349                                          unsigned int virq)
1350 {
1351         struct irq_data *irq_data = irq_get_irq_data(virq);
1352 
1353         return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1354 }
1355 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1356 
1357 /**
1358  * irq_domain_set_info - Set the complete data for a @virq in @domain
1359  * @domain:             Interrupt domain to match
1360  * @virq:               IRQ number
1361  * @hwirq:              The hardware interrupt number
1362  * @chip:               The associated interrupt chip
1363  * @chip_data:          The associated interrupt chip data
1364  * @handler:            The interrupt flow handler
1365  * @handler_data:       The interrupt flow handler data
1366  * @handler_name:       The interrupt handler name
1367  */
1368 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1369                          irq_hw_number_t hwirq, struct irq_chip *chip,
1370                          void *chip_data, irq_flow_handler_t handler,
1371                          void *handler_data, const char *handler_name)
1372 {
1373         irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1374         irq_set_chip_data(virq, chip_data);
1375         irq_set_handler_data(virq, handler_data);
1376 }
1377 
1378 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1379 {
1380 }
1381 #endif  /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1382 

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