1 // SPDX-License-Identifier: GPL-2.0
2
3 #define pr_fmt(fmt) "irq: " fmt
4
5 #include <linux/acpi.h>
6 #include <linux/debugfs.h>
7 #include <linux/hardirq.h>
8 #include <linux/interrupt.h>
9 #include <linux/irq.h>
10 #include <linux/irqdesc.h>
11 #include <linux/irqdomain.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16 #include <linux/of_irq.h>
17 #include <linux/topology.h>
18 #include <linux/seq_file.h>
19 #include <linux/slab.h>
20 #include <linux/smp.h>
21 #include <linux/fs.h>
22
23 static LIST_HEAD(irq_domain_list);
24 static DEFINE_MUTEX(irq_domain_mutex);
25
26 static struct irq_domain *irq_default_domain;
27
28 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
29 unsigned int nr_irqs, int node, void *arg,
30 bool realloc, const struct irq_affinity_desc *affinity);
31 static void irq_domain_check_hierarchy(struct irq_domain *domain);
32 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq);
33
34 struct irqchip_fwid {
35 struct fwnode_handle fwnode;
36 unsigned int type;
37 char *name;
38 phys_addr_t *pa;
39 };
40
41 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
42 static void debugfs_add_domain_dir(struct irq_domain *d);
43 static void debugfs_remove_domain_dir(struct irq_domain *d);
44 #else
debugfs_add_domain_dir(struct irq_domain * d)45 static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
debugfs_remove_domain_dir(struct irq_domain * d)46 static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
47 #endif
48
irqchip_fwnode_get_name(const struct fwnode_handle * fwnode)49 static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
50 {
51 struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
52
53 return fwid->name;
54 }
55
56 const struct fwnode_operations irqchip_fwnode_ops = {
57 .get_name = irqchip_fwnode_get_name,
58 };
59 EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
60
61 /**
62 * __irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
63 * identifying an irq domain
64 * @type: Type of irqchip_fwnode. See linux/irqdomain.h
65 * @id: Optional user provided id if name != NULL
66 * @name: Optional user provided domain name
67 * @pa: Optional user-provided physical address
68 *
69 * Allocate a struct irqchip_fwid, and return a pointer to the embedded
70 * fwnode_handle (or NULL on failure).
71 *
72 * Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
73 * solely to transport name information to irqdomain creation code. The
74 * node is not stored. For other types the pointer is kept in the irq
75 * domain struct.
76 */
__irq_domain_alloc_fwnode(unsigned int type,int id,const char * name,phys_addr_t * pa)77 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
78 const char *name,
79 phys_addr_t *pa)
80 {
81 struct irqchip_fwid *fwid;
82 char *n;
83
84 fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
85
86 switch (type) {
87 case IRQCHIP_FWNODE_NAMED:
88 n = kasprintf(GFP_KERNEL, "%s", name);
89 break;
90 case IRQCHIP_FWNODE_NAMED_ID:
91 n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
92 break;
93 default:
94 n = kasprintf(GFP_KERNEL, "irqchip@%pa", pa);
95 break;
96 }
97
98 if (!fwid || !n) {
99 kfree(fwid);
100 kfree(n);
101 return NULL;
102 }
103
104 fwid->type = type;
105 fwid->name = n;
106 fwid->pa = pa;
107 fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
108 return &fwid->fwnode;
109 }
110 EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
111
112 /**
113 * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
114 *
115 * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
116 */
irq_domain_free_fwnode(struct fwnode_handle * fwnode)117 void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
118 {
119 struct irqchip_fwid *fwid;
120
121 if (!fwnode || WARN_ON(!is_fwnode_irqchip(fwnode)))
122 return;
123
124 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
125 kfree(fwid->name);
126 kfree(fwid);
127 }
128 EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
129
__irq_domain_create(struct fwnode_handle * fwnode,unsigned int size,irq_hw_number_t hwirq_max,int direct_max,const struct irq_domain_ops * ops,void * host_data)130 static struct irq_domain *__irq_domain_create(struct fwnode_handle *fwnode,
131 unsigned int size,
132 irq_hw_number_t hwirq_max,
133 int direct_max,
134 const struct irq_domain_ops *ops,
135 void *host_data)
136 {
137 struct irqchip_fwid *fwid;
138 struct irq_domain *domain;
139
140 static atomic_t unknown_domains;
141
142 if (WARN_ON((size && direct_max) ||
143 (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max) ||
144 (direct_max && (direct_max != hwirq_max))))
145 return NULL;
146
147 domain = kzalloc_node(struct_size(domain, revmap, size),
148 GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
149 if (!domain)
150 return NULL;
151
152 if (is_fwnode_irqchip(fwnode)) {
153 fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
154
155 switch (fwid->type) {
156 case IRQCHIP_FWNODE_NAMED:
157 case IRQCHIP_FWNODE_NAMED_ID:
158 domain->fwnode = fwnode;
159 domain->name = kstrdup(fwid->name, GFP_KERNEL);
160 if (!domain->name) {
161 kfree(domain);
162 return NULL;
163 }
164 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
165 break;
166 default:
167 domain->fwnode = fwnode;
168 domain->name = fwid->name;
169 break;
170 }
171 } else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
172 is_software_node(fwnode)) {
173 char *name;
174
175 /*
176 * fwnode paths contain '/', which debugfs is legitimately
177 * unhappy about. Replace them with ':', which does
178 * the trick and is not as offensive as '\'...
179 */
180 name = kasprintf(GFP_KERNEL, "%pfw", fwnode);
181 if (!name) {
182 kfree(domain);
183 return NULL;
184 }
185
186 domain->name = strreplace(name, '/', ':');
187 domain->fwnode = fwnode;
188 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
189 }
190
191 if (!domain->name) {
192 if (fwnode)
193 pr_err("Invalid fwnode type for irqdomain\n");
194 domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
195 atomic_inc_return(&unknown_domains));
196 if (!domain->name) {
197 kfree(domain);
198 return NULL;
199 }
200 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
201 }
202
203 fwnode_handle_get(fwnode);
204 fwnode_dev_initialized(fwnode, true);
205
206 /* Fill structure */
207 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
208 domain->ops = ops;
209 domain->host_data = host_data;
210 domain->hwirq_max = hwirq_max;
211
212 if (direct_max)
213 domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP;
214
215 domain->revmap_size = size;
216
217 /*
218 * Hierarchical domains use the domain lock of the root domain
219 * (innermost domain).
220 *
221 * For non-hierarchical domains (as for root domains), the root
222 * pointer is set to the domain itself so that &domain->root->mutex
223 * always points to the right lock.
224 */
225 mutex_init(&domain->mutex);
226 domain->root = domain;
227
228 irq_domain_check_hierarchy(domain);
229
230 return domain;
231 }
232
__irq_domain_publish(struct irq_domain * domain)233 static void __irq_domain_publish(struct irq_domain *domain)
234 {
235 mutex_lock(&irq_domain_mutex);
236 debugfs_add_domain_dir(domain);
237 list_add(&domain->link, &irq_domain_list);
238 mutex_unlock(&irq_domain_mutex);
239
240 pr_debug("Added domain %s\n", domain->name);
241 }
242
243 /**
244 * __irq_domain_add() - Allocate a new irq_domain data structure
245 * @fwnode: firmware node for the interrupt controller
246 * @size: Size of linear map; 0 for radix mapping only
247 * @hwirq_max: Maximum number of interrupts supported by controller
248 * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
249 * direct mapping
250 * @ops: domain callbacks
251 * @host_data: Controller private data pointer
252 *
253 * Allocates and initializes an irq_domain structure.
254 * Returns pointer to IRQ domain, or NULL on failure.
255 */
__irq_domain_add(struct fwnode_handle * fwnode,unsigned int size,irq_hw_number_t hwirq_max,int direct_max,const struct irq_domain_ops * ops,void * host_data)256 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
257 irq_hw_number_t hwirq_max, int direct_max,
258 const struct irq_domain_ops *ops,
259 void *host_data)
260 {
261 struct irq_domain *domain;
262
263 domain = __irq_domain_create(fwnode, size, hwirq_max, direct_max,
264 ops, host_data);
265 if (domain)
266 __irq_domain_publish(domain);
267
268 return domain;
269 }
270 EXPORT_SYMBOL_GPL(__irq_domain_add);
271
272 /**
273 * irq_domain_remove() - Remove an irq domain.
274 * @domain: domain to remove
275 *
276 * This routine is used to remove an irq domain. The caller must ensure
277 * that all mappings within the domain have been disposed of prior to
278 * use, depending on the revmap type.
279 */
irq_domain_remove(struct irq_domain * domain)280 void irq_domain_remove(struct irq_domain *domain)
281 {
282 mutex_lock(&irq_domain_mutex);
283 debugfs_remove_domain_dir(domain);
284
285 WARN_ON(!radix_tree_empty(&domain->revmap_tree));
286
287 list_del(&domain->link);
288
289 /*
290 * If the going away domain is the default one, reset it.
291 */
292 if (unlikely(irq_default_domain == domain))
293 irq_set_default_host(NULL);
294
295 mutex_unlock(&irq_domain_mutex);
296
297 pr_debug("Removed domain %s\n", domain->name);
298
299 fwnode_dev_initialized(domain->fwnode, false);
300 fwnode_handle_put(domain->fwnode);
301 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
302 kfree(domain->name);
303 kfree(domain);
304 }
305 EXPORT_SYMBOL_GPL(irq_domain_remove);
306
irq_domain_update_bus_token(struct irq_domain * domain,enum irq_domain_bus_token bus_token)307 void irq_domain_update_bus_token(struct irq_domain *domain,
308 enum irq_domain_bus_token bus_token)
309 {
310 char *name;
311
312 if (domain->bus_token == bus_token)
313 return;
314
315 mutex_lock(&irq_domain_mutex);
316
317 domain->bus_token = bus_token;
318
319 name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
320 if (!name) {
321 mutex_unlock(&irq_domain_mutex);
322 return;
323 }
324
325 debugfs_remove_domain_dir(domain);
326
327 if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
328 kfree(domain->name);
329 else
330 domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
331
332 domain->name = name;
333 debugfs_add_domain_dir(domain);
334
335 mutex_unlock(&irq_domain_mutex);
336 }
337 EXPORT_SYMBOL_GPL(irq_domain_update_bus_token);
338
339 /**
340 * irq_domain_create_simple() - Register an irq_domain and optionally map a range of irqs
341 * @fwnode: firmware node for the interrupt controller
342 * @size: total number of irqs in mapping
343 * @first_irq: first number of irq block assigned to the domain,
344 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
345 * pre-map all of the irqs in the domain to virqs starting at first_irq.
346 * @ops: domain callbacks
347 * @host_data: Controller private data pointer
348 *
349 * Allocates an irq_domain, and optionally if first_irq is positive then also
350 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
351 *
352 * This is intended to implement the expected behaviour for most
353 * interrupt controllers. If device tree is used, then first_irq will be 0 and
354 * irqs get mapped dynamically on the fly. However, if the controller requires
355 * static virq assignments (non-DT boot) then it will set that up correctly.
356 */
irq_domain_create_simple(struct fwnode_handle * fwnode,unsigned int size,unsigned int first_irq,const struct irq_domain_ops * ops,void * host_data)357 struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
358 unsigned int size,
359 unsigned int first_irq,
360 const struct irq_domain_ops *ops,
361 void *host_data)
362 {
363 struct irq_domain *domain;
364
365 domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data);
366 if (!domain)
367 return NULL;
368
369 if (first_irq > 0) {
370 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
371 /* attempt to allocated irq_descs */
372 int rc = irq_alloc_descs(first_irq, first_irq, size,
373 of_node_to_nid(to_of_node(fwnode)));
374 if (rc < 0)
375 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
376 first_irq);
377 }
378 irq_domain_associate_many(domain, first_irq, 0, size);
379 }
380
381 return domain;
382 }
383 EXPORT_SYMBOL_GPL(irq_domain_create_simple);
384
385 /**
386 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
387 * @of_node: pointer to interrupt controller's device tree node.
388 * @size: total number of irqs in legacy mapping
389 * @first_irq: first number of irq block assigned to the domain
390 * @first_hwirq: first hwirq number to use for the translation. Should normally
391 * be '0', but a positive integer can be used if the effective
392 * hwirqs numbering does not begin at zero.
393 * @ops: map/unmap domain callbacks
394 * @host_data: Controller private data pointer
395 *
396 * Note: the map() callback will be called before this function returns
397 * for all legacy interrupts except 0 (which is always the invalid irq for
398 * a legacy controller).
399 */
irq_domain_add_legacy(struct device_node * of_node,unsigned int size,unsigned int first_irq,irq_hw_number_t first_hwirq,const struct irq_domain_ops * ops,void * host_data)400 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
401 unsigned int size,
402 unsigned int first_irq,
403 irq_hw_number_t first_hwirq,
404 const struct irq_domain_ops *ops,
405 void *host_data)
406 {
407 return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
408 first_irq, first_hwirq, ops, host_data);
409 }
410 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
411
irq_domain_create_legacy(struct fwnode_handle * fwnode,unsigned int size,unsigned int first_irq,irq_hw_number_t first_hwirq,const struct irq_domain_ops * ops,void * host_data)412 struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
413 unsigned int size,
414 unsigned int first_irq,
415 irq_hw_number_t first_hwirq,
416 const struct irq_domain_ops *ops,
417 void *host_data)
418 {
419 struct irq_domain *domain;
420
421 domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
422 if (domain)
423 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
424
425 return domain;
426 }
427 EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
428
429 /**
430 * irq_find_matching_fwspec() - Locates a domain for a given fwspec
431 * @fwspec: FW specifier for an interrupt
432 * @bus_token: domain-specific data
433 */
irq_find_matching_fwspec(struct irq_fwspec * fwspec,enum irq_domain_bus_token bus_token)434 struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
435 enum irq_domain_bus_token bus_token)
436 {
437 struct irq_domain *h, *found = NULL;
438 struct fwnode_handle *fwnode = fwspec->fwnode;
439 int rc;
440
441 /* We might want to match the legacy controller last since
442 * it might potentially be set to match all interrupts in
443 * the absence of a device node. This isn't a problem so far
444 * yet though...
445 *
446 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
447 * values must generate an exact match for the domain to be
448 * selected.
449 */
450 mutex_lock(&irq_domain_mutex);
451 list_for_each_entry(h, &irq_domain_list, link) {
452 if (h->ops->select && bus_token != DOMAIN_BUS_ANY)
453 rc = h->ops->select(h, fwspec, bus_token);
454 else if (h->ops->match)
455 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
456 else
457 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
458 ((bus_token == DOMAIN_BUS_ANY) ||
459 (h->bus_token == bus_token)));
460
461 if (rc) {
462 found = h;
463 break;
464 }
465 }
466 mutex_unlock(&irq_domain_mutex);
467 return found;
468 }
469 EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
470
471 /**
472 * irq_set_default_host() - Set a "default" irq domain
473 * @domain: default domain pointer
474 *
475 * For convenience, it's possible to set a "default" domain that will be used
476 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
477 * platforms that want to manipulate a few hard coded interrupt numbers that
478 * aren't properly represented in the device-tree.
479 */
irq_set_default_host(struct irq_domain * domain)480 void irq_set_default_host(struct irq_domain *domain)
481 {
482 pr_debug("Default domain set to @0x%p\n", domain);
483
484 irq_default_domain = domain;
485 }
486 EXPORT_SYMBOL_GPL(irq_set_default_host);
487
488 /**
489 * irq_get_default_host() - Retrieve the "default" irq domain
490 *
491 * Returns: the default domain, if any.
492 *
493 * Modern code should never use this. This should only be used on
494 * systems that cannot implement a firmware->fwnode mapping (which
495 * both DT and ACPI provide).
496 */
irq_get_default_host(void)497 struct irq_domain *irq_get_default_host(void)
498 {
499 return irq_default_domain;
500 }
501 EXPORT_SYMBOL_GPL(irq_get_default_host);
502
irq_domain_is_nomap(struct irq_domain * domain)503 static bool irq_domain_is_nomap(struct irq_domain *domain)
504 {
505 return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) &&
506 (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP);
507 }
508
irq_domain_clear_mapping(struct irq_domain * domain,irq_hw_number_t hwirq)509 static void irq_domain_clear_mapping(struct irq_domain *domain,
510 irq_hw_number_t hwirq)
511 {
512 lockdep_assert_held(&domain->root->mutex);
513
514 if (irq_domain_is_nomap(domain))
515 return;
516
517 if (hwirq < domain->revmap_size)
518 rcu_assign_pointer(domain->revmap[hwirq], NULL);
519 else
520 radix_tree_delete(&domain->revmap_tree, hwirq);
521 }
522
irq_domain_set_mapping(struct irq_domain * domain,irq_hw_number_t hwirq,struct irq_data * irq_data)523 static void irq_domain_set_mapping(struct irq_domain *domain,
524 irq_hw_number_t hwirq,
525 struct irq_data *irq_data)
526 {
527 /*
528 * This also makes sure that all domains point to the same root when
529 * called from irq_domain_insert_irq() for each domain in a hierarchy.
530 */
531 lockdep_assert_held(&domain->root->mutex);
532
533 if (irq_domain_is_nomap(domain))
534 return;
535
536 if (hwirq < domain->revmap_size)
537 rcu_assign_pointer(domain->revmap[hwirq], irq_data);
538 else
539 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
540 }
541
irq_domain_disassociate(struct irq_domain * domain,unsigned int irq)542 static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
543 {
544 struct irq_data *irq_data = irq_get_irq_data(irq);
545 irq_hw_number_t hwirq;
546
547 if (WARN(!irq_data || irq_data->domain != domain,
548 "virq%i doesn't exist; cannot disassociate\n", irq))
549 return;
550
551 hwirq = irq_data->hwirq;
552
553 mutex_lock(&domain->root->mutex);
554
555 irq_set_status_flags(irq, IRQ_NOREQUEST);
556
557 /* remove chip and handler */
558 irq_set_chip_and_handler(irq, NULL, NULL);
559
560 /* Make sure it's completed */
561 synchronize_irq(irq);
562
563 /* Tell the PIC about it */
564 if (domain->ops->unmap)
565 domain->ops->unmap(domain, irq);
566 smp_mb();
567
568 irq_data->domain = NULL;
569 irq_data->hwirq = 0;
570 domain->mapcount--;
571
572 /* Clear reverse map for this hwirq */
573 irq_domain_clear_mapping(domain, hwirq);
574
575 mutex_unlock(&domain->root->mutex);
576 }
577
irq_domain_associate_locked(struct irq_domain * domain,unsigned int virq,irq_hw_number_t hwirq)578 static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,
579 irq_hw_number_t hwirq)
580 {
581 struct irq_data *irq_data = irq_get_irq_data(virq);
582 int ret;
583
584 if (WARN(hwirq >= domain->hwirq_max,
585 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
586 return -EINVAL;
587 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
588 return -EINVAL;
589 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
590 return -EINVAL;
591
592 irq_data->hwirq = hwirq;
593 irq_data->domain = domain;
594 if (domain->ops->map) {
595 ret = domain->ops->map(domain, virq, hwirq);
596 if (ret != 0) {
597 /*
598 * If map() returns -EPERM, this interrupt is protected
599 * by the firmware or some other service and shall not
600 * be mapped. Don't bother telling the user about it.
601 */
602 if (ret != -EPERM) {
603 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
604 domain->name, hwirq, virq, ret);
605 }
606 irq_data->domain = NULL;
607 irq_data->hwirq = 0;
608 return ret;
609 }
610 }
611
612 domain->mapcount++;
613 irq_domain_set_mapping(domain, hwirq, irq_data);
614
615 irq_clear_status_flags(virq, IRQ_NOREQUEST);
616
617 return 0;
618 }
619
irq_domain_associate(struct irq_domain * domain,unsigned int virq,irq_hw_number_t hwirq)620 int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
621 irq_hw_number_t hwirq)
622 {
623 int ret;
624
625 mutex_lock(&domain->root->mutex);
626 ret = irq_domain_associate_locked(domain, virq, hwirq);
627 mutex_unlock(&domain->root->mutex);
628
629 return ret;
630 }
631 EXPORT_SYMBOL_GPL(irq_domain_associate);
632
irq_domain_associate_many(struct irq_domain * domain,unsigned int irq_base,irq_hw_number_t hwirq_base,int count)633 void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
634 irq_hw_number_t hwirq_base, int count)
635 {
636 struct device_node *of_node;
637 int i;
638
639 of_node = irq_domain_get_of_node(domain);
640 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
641 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
642
643 for (i = 0; i < count; i++)
644 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
645 }
646 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
647
648 #ifdef CONFIG_IRQ_DOMAIN_NOMAP
649 /**
650 * irq_create_direct_mapping() - Allocate an irq for direct mapping
651 * @domain: domain to allocate the irq for or NULL for default domain
652 *
653 * This routine is used for irq controllers which can choose the hardware
654 * interrupt numbers they generate. In such a case it's simplest to use
655 * the linux irq as the hardware interrupt number. It still uses the linear
656 * or radix tree to store the mapping, but the irq controller can optimize
657 * the revmap path by using the hwirq directly.
658 */
irq_create_direct_mapping(struct irq_domain * domain)659 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
660 {
661 struct device_node *of_node;
662 unsigned int virq;
663
664 if (domain == NULL)
665 domain = irq_default_domain;
666
667 of_node = irq_domain_get_of_node(domain);
668 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
669 if (!virq) {
670 pr_debug("create_direct virq allocation failed\n");
671 return 0;
672 }
673 if (virq >= domain->hwirq_max) {
674 pr_err("ERROR: no free irqs available below %lu maximum\n",
675 domain->hwirq_max);
676 irq_free_desc(virq);
677 return 0;
678 }
679 pr_debug("create_direct obtained virq %d\n", virq);
680
681 if (irq_domain_associate(domain, virq, virq)) {
682 irq_free_desc(virq);
683 return 0;
684 }
685
686 return virq;
687 }
688 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
689 #endif
690
irq_create_mapping_affinity_locked(struct irq_domain * domain,irq_hw_number_t hwirq,const struct irq_affinity_desc * affinity)691 static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
692 irq_hw_number_t hwirq,
693 const struct irq_affinity_desc *affinity)
694 {
695 struct device_node *of_node = irq_domain_get_of_node(domain);
696 int virq;
697
698 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
699
700 /* Allocate a virtual interrupt number */
701 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
702 affinity);
703 if (virq <= 0) {
704 pr_debug("-> virq allocation failed\n");
705 return 0;
706 }
707
708 if (irq_domain_associate_locked(domain, virq, hwirq)) {
709 irq_free_desc(virq);
710 return 0;
711 }
712
713 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
714 hwirq, of_node_full_name(of_node), virq);
715
716 return virq;
717 }
718
719 /**
720 * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space
721 * @domain: domain owning this hardware interrupt or NULL for default domain
722 * @hwirq: hardware irq number in that domain space
723 * @affinity: irq affinity
724 *
725 * Only one mapping per hardware interrupt is permitted. Returns a linux
726 * irq number.
727 * If the sense/trigger is to be specified, set_irq_type() should be called
728 * on the number returned from that call.
729 */
irq_create_mapping_affinity(struct irq_domain * domain,irq_hw_number_t hwirq,const struct irq_affinity_desc * affinity)730 unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
731 irq_hw_number_t hwirq,
732 const struct irq_affinity_desc *affinity)
733 {
734 int virq;
735
736 /* Look for default domain if necessary */
737 if (domain == NULL)
738 domain = irq_default_domain;
739 if (domain == NULL) {
740 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
741 return 0;
742 }
743
744 mutex_lock(&domain->root->mutex);
745
746 /* Check if mapping already exists */
747 virq = irq_find_mapping(domain, hwirq);
748 if (virq) {
749 pr_debug("existing mapping on virq %d\n", virq);
750 goto out;
751 }
752
753 virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
754 out:
755 mutex_unlock(&domain->root->mutex);
756
757 return virq;
758 }
759 EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
760
irq_domain_translate(struct irq_domain * d,struct irq_fwspec * fwspec,irq_hw_number_t * hwirq,unsigned int * type)761 static int irq_domain_translate(struct irq_domain *d,
762 struct irq_fwspec *fwspec,
763 irq_hw_number_t *hwirq, unsigned int *type)
764 {
765 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
766 if (d->ops->translate)
767 return d->ops->translate(d, fwspec, hwirq, type);
768 #endif
769 if (d->ops->xlate)
770 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
771 fwspec->param, fwspec->param_count,
772 hwirq, type);
773
774 /* If domain has no translation, then we assume interrupt line */
775 *hwirq = fwspec->param[0];
776 return 0;
777 }
778
of_phandle_args_to_fwspec(struct device_node * np,const u32 * args,unsigned int count,struct irq_fwspec * fwspec)779 void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
780 unsigned int count, struct irq_fwspec *fwspec)
781 {
782 int i;
783
784 fwspec->fwnode = of_node_to_fwnode(np);
785 fwspec->param_count = count;
786
787 for (i = 0; i < count; i++)
788 fwspec->param[i] = args[i];
789 }
790 EXPORT_SYMBOL_GPL(of_phandle_args_to_fwspec);
791
irq_create_fwspec_mapping(struct irq_fwspec * fwspec)792 unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
793 {
794 struct irq_domain *domain;
795 struct irq_data *irq_data;
796 irq_hw_number_t hwirq;
797 unsigned int type = IRQ_TYPE_NONE;
798 int virq;
799
800 if (fwspec->fwnode) {
801 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
802 if (!domain)
803 domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
804 } else {
805 domain = irq_default_domain;
806 }
807
808 if (!domain) {
809 pr_warn("no irq domain found for %s !\n",
810 of_node_full_name(to_of_node(fwspec->fwnode)));
811 return 0;
812 }
813
814 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
815 return 0;
816
817 /*
818 * WARN if the irqchip returns a type with bits
819 * outside the sense mask set and clear these bits.
820 */
821 if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
822 type &= IRQ_TYPE_SENSE_MASK;
823
824 mutex_lock(&domain->root->mutex);
825
826 /*
827 * If we've already configured this interrupt,
828 * don't do it again, or hell will break loose.
829 */
830 virq = irq_find_mapping(domain, hwirq);
831 if (virq) {
832 /*
833 * If the trigger type is not specified or matches the
834 * current trigger type then we are done so return the
835 * interrupt number.
836 */
837 if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
838 goto out;
839
840 /*
841 * If the trigger type has not been set yet, then set
842 * it now and return the interrupt number.
843 */
844 if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
845 irq_data = irq_get_irq_data(virq);
846 if (!irq_data) {
847 virq = 0;
848 goto out;
849 }
850
851 irqd_set_trigger_type(irq_data, type);
852 goto out;
853 }
854
855 pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
856 hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
857 virq = 0;
858 goto out;
859 }
860
861 if (irq_domain_is_hierarchy(domain)) {
862 if (irq_domain_is_msi_device(domain)) {
863 mutex_unlock(&domain->root->mutex);
864 virq = msi_device_domain_alloc_wired(domain, hwirq, type);
865 mutex_lock(&domain->root->mutex);
866 } else
867 virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
868 fwspec, false, NULL);
869 if (virq <= 0) {
870 virq = 0;
871 goto out;
872 }
873 } else {
874 /* Create mapping */
875 virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
876 if (!virq)
877 goto out;
878 }
879
880 irq_data = irq_get_irq_data(virq);
881 if (WARN_ON(!irq_data)) {
882 virq = 0;
883 goto out;
884 }
885
886 /* Store trigger type */
887 irqd_set_trigger_type(irq_data, type);
888 out:
889 mutex_unlock(&domain->root->mutex);
890
891 return virq;
892 }
893 EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
894
irq_create_of_mapping(struct of_phandle_args * irq_data)895 unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
896 {
897 struct irq_fwspec fwspec;
898
899 of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
900 irq_data->args_count, &fwspec);
901
902 return irq_create_fwspec_mapping(&fwspec);
903 }
904 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
905
906 /**
907 * irq_dispose_mapping() - Unmap an interrupt
908 * @virq: linux irq number of the interrupt to unmap
909 */
irq_dispose_mapping(unsigned int virq)910 void irq_dispose_mapping(unsigned int virq)
911 {
912 struct irq_data *irq_data;
913 struct irq_domain *domain;
914
915 irq_data = virq ? irq_get_irq_data(virq) : NULL;
916 if (!irq_data)
917 return;
918
919 domain = irq_data->domain;
920 if (WARN_ON(domain == NULL))
921 return;
922
923 if (irq_domain_is_hierarchy(domain)) {
924 irq_domain_free_one_irq(domain, virq);
925 } else {
926 irq_domain_disassociate(domain, virq);
927 irq_free_desc(virq);
928 }
929 }
930 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
931
932 /**
933 * __irq_resolve_mapping() - Find a linux irq from a hw irq number.
934 * @domain: domain owning this hardware interrupt
935 * @hwirq: hardware irq number in that domain space
936 * @irq: optional pointer to return the Linux irq if required
937 *
938 * Returns the interrupt descriptor.
939 */
__irq_resolve_mapping(struct irq_domain * domain,irq_hw_number_t hwirq,unsigned int * irq)940 struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
941 irq_hw_number_t hwirq,
942 unsigned int *irq)
943 {
944 struct irq_desc *desc = NULL;
945 struct irq_data *data;
946
947 /* Look for default domain if necessary */
948 if (domain == NULL)
949 domain = irq_default_domain;
950 if (domain == NULL)
951 return desc;
952
953 if (irq_domain_is_nomap(domain)) {
954 if (hwirq < domain->hwirq_max) {
955 data = irq_domain_get_irq_data(domain, hwirq);
956 if (data && data->hwirq == hwirq)
957 desc = irq_data_to_desc(data);
958 if (irq && desc)
959 *irq = hwirq;
960 }
961
962 return desc;
963 }
964
965 rcu_read_lock();
966 /* Check if the hwirq is in the linear revmap. */
967 if (hwirq < domain->revmap_size)
968 data = rcu_dereference(domain->revmap[hwirq]);
969 else
970 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
971
972 if (likely(data)) {
973 desc = irq_data_to_desc(data);
974 if (irq)
975 *irq = data->irq;
976 }
977
978 rcu_read_unlock();
979 return desc;
980 }
981 EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
982
983 /**
984 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
985 *
986 * Device Tree IRQ specifier translation function which works with one cell
987 * bindings where the cell value maps directly to the hwirq number.
988 */
irq_domain_xlate_onecell(struct irq_domain * d,struct device_node * ctrlr,const u32 * intspec,unsigned int intsize,unsigned long * out_hwirq,unsigned int * out_type)989 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
990 const u32 *intspec, unsigned int intsize,
991 unsigned long *out_hwirq, unsigned int *out_type)
992 {
993 if (WARN_ON(intsize < 1))
994 return -EINVAL;
995 *out_hwirq = intspec[0];
996 *out_type = IRQ_TYPE_NONE;
997 return 0;
998 }
999 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
1000
1001 /**
1002 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
1003 *
1004 * Device Tree IRQ specifier translation function which works with two cell
1005 * bindings where the cell values map directly to the hwirq number
1006 * and linux irq flags.
1007 */
irq_domain_xlate_twocell(struct irq_domain * d,struct device_node * ctrlr,const u32 * intspec,unsigned int intsize,irq_hw_number_t * out_hwirq,unsigned int * out_type)1008 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
1009 const u32 *intspec, unsigned int intsize,
1010 irq_hw_number_t *out_hwirq, unsigned int *out_type)
1011 {
1012 struct irq_fwspec fwspec;
1013
1014 of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
1015 return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
1016 }
1017 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
1018
1019 /**
1020 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
1021 *
1022 * Device Tree IRQ specifier translation function which works with either one
1023 * or two cell bindings where the cell values map directly to the hwirq number
1024 * and linux irq flags.
1025 *
1026 * Note: don't use this function unless your interrupt controller explicitly
1027 * supports both one and two cell bindings. For the majority of controllers
1028 * the _onecell() or _twocell() variants above should be used.
1029 */
irq_domain_xlate_onetwocell(struct irq_domain * d,struct device_node * ctrlr,const u32 * intspec,unsigned int intsize,unsigned long * out_hwirq,unsigned int * out_type)1030 int irq_domain_xlate_onetwocell(struct irq_domain *d,
1031 struct device_node *ctrlr,
1032 const u32 *intspec, unsigned int intsize,
1033 unsigned long *out_hwirq, unsigned int *out_type)
1034 {
1035 if (WARN_ON(intsize < 1))
1036 return -EINVAL;
1037 *out_hwirq = intspec[0];
1038 if (intsize > 1)
1039 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1040 else
1041 *out_type = IRQ_TYPE_NONE;
1042 return 0;
1043 }
1044 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
1045
1046 const struct irq_domain_ops irq_domain_simple_ops = {
1047 .xlate = irq_domain_xlate_onetwocell,
1048 };
1049 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1050
1051 /**
1052 * irq_domain_translate_onecell() - Generic translate for direct one cell
1053 * bindings
1054 */
irq_domain_translate_onecell(struct irq_domain * d,struct irq_fwspec * fwspec,unsigned long * out_hwirq,unsigned int * out_type)1055 int irq_domain_translate_onecell(struct irq_domain *d,
1056 struct irq_fwspec *fwspec,
1057 unsigned long *out_hwirq,
1058 unsigned int *out_type)
1059 {
1060 if (WARN_ON(fwspec->param_count < 1))
1061 return -EINVAL;
1062 *out_hwirq = fwspec->param[0];
1063 *out_type = IRQ_TYPE_NONE;
1064 return 0;
1065 }
1066 EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
1067
1068 /**
1069 * irq_domain_translate_twocell() - Generic translate for direct two cell
1070 * bindings
1071 *
1072 * Device Tree IRQ specifier translation function which works with two cell
1073 * bindings where the cell values map directly to the hwirq number
1074 * and linux irq flags.
1075 */
irq_domain_translate_twocell(struct irq_domain * d,struct irq_fwspec * fwspec,unsigned long * out_hwirq,unsigned int * out_type)1076 int irq_domain_translate_twocell(struct irq_domain *d,
1077 struct irq_fwspec *fwspec,
1078 unsigned long *out_hwirq,
1079 unsigned int *out_type)
1080 {
1081 if (WARN_ON(fwspec->param_count < 2))
1082 return -EINVAL;
1083 *out_hwirq = fwspec->param[0];
1084 *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
1085 return 0;
1086 }
1087 EXPORT_SYMBOL_GPL(irq_domain_translate_twocell);
1088
irq_domain_alloc_descs(int virq,unsigned int cnt,irq_hw_number_t hwirq,int node,const struct irq_affinity_desc * affinity)1089 int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
1090 int node, const struct irq_affinity_desc *affinity)
1091 {
1092 unsigned int hint;
1093
1094 if (virq >= 0) {
1095 virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE,
1096 affinity);
1097 } else {
1098 hint = hwirq % nr_irqs;
1099 if (hint == 0)
1100 hint++;
1101 virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE,
1102 affinity);
1103 if (virq <= 0 && hint > 1) {
1104 virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE,
1105 affinity);
1106 }
1107 }
1108
1109 return virq;
1110 }
1111
1112 /**
1113 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1114 * @irq_data: The pointer to irq_data
1115 */
irq_domain_reset_irq_data(struct irq_data * irq_data)1116 void irq_domain_reset_irq_data(struct irq_data *irq_data)
1117 {
1118 irq_data->hwirq = 0;
1119 irq_data->chip = &no_irq_chip;
1120 irq_data->chip_data = NULL;
1121 }
1122 EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1123
1124 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1125 /**
1126 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
1127 * @parent: Parent irq domain to associate with the new domain
1128 * @flags: Irq domain flags associated to the domain
1129 * @size: Size of the domain. See below
1130 * @fwnode: Optional fwnode of the interrupt controller
1131 * @ops: Pointer to the interrupt domain callbacks
1132 * @host_data: Controller private data pointer
1133 *
1134 * If @size is 0 a tree domain is created, otherwise a linear domain.
1135 *
1136 * If successful the parent is associated to the new domain and the
1137 * domain flags are set.
1138 * Returns pointer to IRQ domain, or NULL on failure.
1139 */
irq_domain_create_hierarchy(struct irq_domain * parent,unsigned int flags,unsigned int size,struct fwnode_handle * fwnode,const struct irq_domain_ops * ops,void * host_data)1140 struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
1141 unsigned int flags,
1142 unsigned int size,
1143 struct fwnode_handle *fwnode,
1144 const struct irq_domain_ops *ops,
1145 void *host_data)
1146 {
1147 struct irq_domain *domain;
1148
1149 if (size)
1150 domain = __irq_domain_create(fwnode, size, size, 0, ops, host_data);
1151 else
1152 domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
1153
1154 if (domain) {
1155 if (parent)
1156 domain->root = parent->root;
1157 domain->parent = parent;
1158 domain->flags |= flags;
1159
1160 __irq_domain_publish(domain);
1161 }
1162
1163 return domain;
1164 }
1165 EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
1166
irq_domain_insert_irq(int virq)1167 static void irq_domain_insert_irq(int virq)
1168 {
1169 struct irq_data *data;
1170
1171 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1172 struct irq_domain *domain = data->domain;
1173
1174 domain->mapcount++;
1175 irq_domain_set_mapping(domain, data->hwirq, data);
1176 }
1177
1178 irq_clear_status_flags(virq, IRQ_NOREQUEST);
1179 }
1180
irq_domain_remove_irq(int virq)1181 static void irq_domain_remove_irq(int virq)
1182 {
1183 struct irq_data *data;
1184
1185 irq_set_status_flags(virq, IRQ_NOREQUEST);
1186 irq_set_chip_and_handler(virq, NULL, NULL);
1187 synchronize_irq(virq);
1188 smp_mb();
1189
1190 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
1191 struct irq_domain *domain = data->domain;
1192 irq_hw_number_t hwirq = data->hwirq;
1193
1194 domain->mapcount--;
1195 irq_domain_clear_mapping(domain, hwirq);
1196 }
1197 }
1198
irq_domain_insert_irq_data(struct irq_domain * domain,struct irq_data * child)1199 static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
1200 struct irq_data *child)
1201 {
1202 struct irq_data *irq_data;
1203
1204 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
1205 irq_data_get_node(child));
1206 if (irq_data) {
1207 child->parent_data = irq_data;
1208 irq_data->irq = child->irq;
1209 irq_data->common = child->common;
1210 irq_data->domain = domain;
1211 }
1212
1213 return irq_data;
1214 }
1215
__irq_domain_free_hierarchy(struct irq_data * irq_data)1216 static void __irq_domain_free_hierarchy(struct irq_data *irq_data)
1217 {
1218 struct irq_data *tmp;
1219
1220 while (irq_data) {
1221 tmp = irq_data;
1222 irq_data = irq_data->parent_data;
1223 kfree(tmp);
1224 }
1225 }
1226
irq_domain_free_irq_data(unsigned int virq,unsigned int nr_irqs)1227 static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
1228 {
1229 struct irq_data *irq_data, *tmp;
1230 int i;
1231
1232 for (i = 0; i < nr_irqs; i++) {
1233 irq_data = irq_get_irq_data(virq + i);
1234 tmp = irq_data->parent_data;
1235 irq_data->parent_data = NULL;
1236 irq_data->domain = NULL;
1237
1238 __irq_domain_free_hierarchy(tmp);
1239 }
1240 }
1241
1242 /**
1243 * irq_domain_disconnect_hierarchy - Mark the first unused level of a hierarchy
1244 * @domain: IRQ domain from which the hierarchy is to be disconnected
1245 * @virq: IRQ number where the hierarchy is to be trimmed
1246 *
1247 * Marks the @virq level belonging to @domain as disconnected.
1248 * Returns -EINVAL if @virq doesn't have a valid irq_data pointing
1249 * to @domain.
1250 *
1251 * Its only use is to be able to trim levels of hierarchy that do not
1252 * have any real meaning for this interrupt, and that the driver marks
1253 * as such from its .alloc() callback.
1254 */
irq_domain_disconnect_hierarchy(struct irq_domain * domain,unsigned int virq)1255 int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
1256 unsigned int virq)
1257 {
1258 struct irq_data *irqd;
1259
1260 irqd = irq_domain_get_irq_data(domain, virq);
1261 if (!irqd)
1262 return -EINVAL;
1263
1264 irqd->chip = ERR_PTR(-ENOTCONN);
1265 return 0;
1266 }
1267 EXPORT_SYMBOL_GPL(irq_domain_disconnect_hierarchy);
1268
irq_domain_trim_hierarchy(unsigned int virq)1269 static int irq_domain_trim_hierarchy(unsigned int virq)
1270 {
1271 struct irq_data *tail, *irqd, *irq_data;
1272
1273 irq_data = irq_get_irq_data(virq);
1274 tail = NULL;
1275
1276 /* The first entry must have a valid irqchip */
1277 if (!irq_data->chip || IS_ERR(irq_data->chip))
1278 return -EINVAL;
1279
1280 /*
1281 * Validate that the irq_data chain is sane in the presence of
1282 * a hierarchy trimming marker.
1283 */
1284 for (irqd = irq_data->parent_data; irqd; irq_data = irqd, irqd = irqd->parent_data) {
1285 /* Can't have a valid irqchip after a trim marker */
1286 if (irqd->chip && tail)
1287 return -EINVAL;
1288
1289 /* Can't have an empty irqchip before a trim marker */
1290 if (!irqd->chip && !tail)
1291 return -EINVAL;
1292
1293 if (IS_ERR(irqd->chip)) {
1294 /* Only -ENOTCONN is a valid trim marker */
1295 if (PTR_ERR(irqd->chip) != -ENOTCONN)
1296 return -EINVAL;
1297
1298 tail = irq_data;
1299 }
1300 }
1301
1302 /* No trim marker, nothing to do */
1303 if (!tail)
1304 return 0;
1305
1306 pr_info("IRQ%d: trimming hierarchy from %s\n",
1307 virq, tail->parent_data->domain->name);
1308
1309 /* Sever the inner part of the hierarchy... */
1310 irqd = tail;
1311 tail = tail->parent_data;
1312 irqd->parent_data = NULL;
1313 __irq_domain_free_hierarchy(tail);
1314
1315 return 0;
1316 }
1317
irq_domain_alloc_irq_data(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs)1318 static int irq_domain_alloc_irq_data(struct irq_domain *domain,
1319 unsigned int virq, unsigned int nr_irqs)
1320 {
1321 struct irq_data *irq_data;
1322 struct irq_domain *parent;
1323 int i;
1324
1325 /* The outermost irq_data is embedded in struct irq_desc */
1326 for (i = 0; i < nr_irqs; i++) {
1327 irq_data = irq_get_irq_data(virq + i);
1328 irq_data->domain = domain;
1329
1330 for (parent = domain->parent; parent; parent = parent->parent) {
1331 irq_data = irq_domain_insert_irq_data(parent, irq_data);
1332 if (!irq_data) {
1333 irq_domain_free_irq_data(virq, i + 1);
1334 return -ENOMEM;
1335 }
1336 }
1337 }
1338
1339 return 0;
1340 }
1341
1342 /**
1343 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1344 * @domain: domain to match
1345 * @virq: IRQ number to get irq_data
1346 */
irq_domain_get_irq_data(struct irq_domain * domain,unsigned int virq)1347 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1348 unsigned int virq)
1349 {
1350 struct irq_data *irq_data;
1351
1352 for (irq_data = irq_get_irq_data(virq); irq_data;
1353 irq_data = irq_data->parent_data)
1354 if (irq_data->domain == domain)
1355 return irq_data;
1356
1357 return NULL;
1358 }
1359 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1360
1361 /**
1362 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1363 * @domain: Interrupt domain to match
1364 * @virq: IRQ number
1365 * @hwirq: The hwirq number
1366 * @chip: The associated interrupt chip
1367 * @chip_data: The associated chip data
1368 */
irq_domain_set_hwirq_and_chip(struct irq_domain * domain,unsigned int virq,irq_hw_number_t hwirq,const struct irq_chip * chip,void * chip_data)1369 int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1370 irq_hw_number_t hwirq,
1371 const struct irq_chip *chip,
1372 void *chip_data)
1373 {
1374 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1375
1376 if (!irq_data)
1377 return -ENOENT;
1378
1379 irq_data->hwirq = hwirq;
1380 irq_data->chip = (struct irq_chip *)(chip ? chip : &no_irq_chip);
1381 irq_data->chip_data = chip_data;
1382
1383 return 0;
1384 }
1385 EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1386
1387 /**
1388 * irq_domain_set_info - Set the complete data for a @virq in @domain
1389 * @domain: Interrupt domain to match
1390 * @virq: IRQ number
1391 * @hwirq: The hardware interrupt number
1392 * @chip: The associated interrupt chip
1393 * @chip_data: The associated interrupt chip data
1394 * @handler: The interrupt flow handler
1395 * @handler_data: The interrupt flow handler data
1396 * @handler_name: The interrupt handler name
1397 */
irq_domain_set_info(struct irq_domain * domain,unsigned int virq,irq_hw_number_t hwirq,const struct irq_chip * chip,void * chip_data,irq_flow_handler_t handler,void * handler_data,const char * handler_name)1398 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1399 irq_hw_number_t hwirq, const struct irq_chip *chip,
1400 void *chip_data, irq_flow_handler_t handler,
1401 void *handler_data, const char *handler_name)
1402 {
1403 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1404 __irq_set_handler(virq, handler, 0, handler_name);
1405 irq_set_handler_data(virq, handler_data);
1406 }
1407 EXPORT_SYMBOL(irq_domain_set_info);
1408
1409 /**
1410 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1411 * @domain: Interrupt domain to match
1412 * @virq: IRQ number to start with
1413 * @nr_irqs: The number of irqs to free
1414 */
irq_domain_free_irqs_common(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs)1415 void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1416 unsigned int nr_irqs)
1417 {
1418 struct irq_data *irq_data;
1419 int i;
1420
1421 for (i = 0; i < nr_irqs; i++) {
1422 irq_data = irq_domain_get_irq_data(domain, virq + i);
1423 if (irq_data)
1424 irq_domain_reset_irq_data(irq_data);
1425 }
1426 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1427 }
1428 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_common);
1429
1430 /**
1431 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1432 * @domain: Interrupt domain to match
1433 * @virq: IRQ number to start with
1434 * @nr_irqs: The number of irqs to free
1435 */
irq_domain_free_irqs_top(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs)1436 void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1437 unsigned int nr_irqs)
1438 {
1439 int i;
1440
1441 for (i = 0; i < nr_irqs; i++) {
1442 irq_set_handler_data(virq + i, NULL);
1443 irq_set_handler(virq + i, NULL);
1444 }
1445 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1446 }
1447
irq_domain_free_irqs_hierarchy(struct irq_domain * domain,unsigned int irq_base,unsigned int nr_irqs)1448 static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
1449 unsigned int irq_base,
1450 unsigned int nr_irqs)
1451 {
1452 unsigned int i;
1453
1454 if (!domain->ops->free)
1455 return;
1456
1457 for (i = 0; i < nr_irqs; i++) {
1458 if (irq_domain_get_irq_data(domain, irq_base + i))
1459 domain->ops->free(domain, irq_base + i, 1);
1460 }
1461 }
1462
irq_domain_alloc_irqs_hierarchy(struct irq_domain * domain,unsigned int irq_base,unsigned int nr_irqs,void * arg)1463 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
1464 unsigned int irq_base,
1465 unsigned int nr_irqs, void *arg)
1466 {
1467 if (!domain->ops->alloc) {
1468 pr_debug("domain->ops->alloc() is NULL\n");
1469 return -ENOSYS;
1470 }
1471
1472 return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1473 }
1474
irq_domain_alloc_irqs_locked(struct irq_domain * domain,int irq_base,unsigned int nr_irqs,int node,void * arg,bool realloc,const struct irq_affinity_desc * affinity)1475 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1476 unsigned int nr_irqs, int node, void *arg,
1477 bool realloc, const struct irq_affinity_desc *affinity)
1478 {
1479 int i, ret, virq;
1480
1481 if (realloc && irq_base >= 0) {
1482 virq = irq_base;
1483 } else {
1484 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node,
1485 affinity);
1486 if (virq < 0) {
1487 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1488 irq_base, nr_irqs);
1489 return virq;
1490 }
1491 }
1492
1493 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1494 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1495 ret = -ENOMEM;
1496 goto out_free_desc;
1497 }
1498
1499 ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg);
1500 if (ret < 0)
1501 goto out_free_irq_data;
1502
1503 for (i = 0; i < nr_irqs; i++) {
1504 ret = irq_domain_trim_hierarchy(virq + i);
1505 if (ret)
1506 goto out_free_irq_data;
1507 }
1508
1509 for (i = 0; i < nr_irqs; i++)
1510 irq_domain_insert_irq(virq + i);
1511
1512 return virq;
1513
1514 out_free_irq_data:
1515 irq_domain_free_irq_data(virq, nr_irqs);
1516 out_free_desc:
1517 irq_free_descs(virq, nr_irqs);
1518 return ret;
1519 }
1520
1521 /**
1522 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1523 * @domain: domain to allocate from
1524 * @irq_base: allocate specified IRQ number if irq_base >= 0
1525 * @nr_irqs: number of IRQs to allocate
1526 * @node: NUMA node id for memory allocation
1527 * @arg: domain specific argument
1528 * @realloc: IRQ descriptors have already been allocated if true
1529 * @affinity: Optional irq affinity mask for multiqueue devices
1530 *
1531 * Allocate IRQ numbers and initialized all data structures to support
1532 * hierarchy IRQ domains.
1533 * Parameter @realloc is mainly to support legacy IRQs.
1534 * Returns error code or allocated IRQ number
1535 *
1536 * The whole process to setup an IRQ has been split into two steps.
1537 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1538 * descriptor and required hardware resources. The second step,
1539 * irq_domain_activate_irq(), is to program the hardware with preallocated
1540 * resources. In this way, it's easier to rollback when failing to
1541 * allocate resources.
1542 */
__irq_domain_alloc_irqs(struct irq_domain * domain,int irq_base,unsigned int nr_irqs,int node,void * arg,bool realloc,const struct irq_affinity_desc * affinity)1543 int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1544 unsigned int nr_irqs, int node, void *arg,
1545 bool realloc, const struct irq_affinity_desc *affinity)
1546 {
1547 int ret;
1548
1549 if (domain == NULL) {
1550 domain = irq_default_domain;
1551 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1552 return -EINVAL;
1553 }
1554
1555 mutex_lock(&domain->root->mutex);
1556 ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg,
1557 realloc, affinity);
1558 mutex_unlock(&domain->root->mutex);
1559
1560 return ret;
1561 }
1562 EXPORT_SYMBOL_GPL(__irq_domain_alloc_irqs);
1563
1564 /* The irq_data was moved, fix the revmap to refer to the new location */
irq_domain_fix_revmap(struct irq_data * d)1565 static void irq_domain_fix_revmap(struct irq_data *d)
1566 {
1567 void __rcu **slot;
1568
1569 lockdep_assert_held(&d->domain->root->mutex);
1570
1571 if (irq_domain_is_nomap(d->domain))
1572 return;
1573
1574 /* Fix up the revmap. */
1575 if (d->hwirq < d->domain->revmap_size) {
1576 /* Not using radix tree */
1577 rcu_assign_pointer(d->domain->revmap[d->hwirq], d);
1578 } else {
1579 slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq);
1580 if (slot)
1581 radix_tree_replace_slot(&d->domain->revmap_tree, slot, d);
1582 }
1583 }
1584
1585 /**
1586 * irq_domain_push_irq() - Push a domain in to the top of a hierarchy.
1587 * @domain: Domain to push.
1588 * @virq: Irq to push the domain in to.
1589 * @arg: Passed to the irq_domain_ops alloc() function.
1590 *
1591 * For an already existing irqdomain hierarchy, as might be obtained
1592 * via a call to pci_enable_msix(), add an additional domain to the
1593 * head of the processing chain. Must be called before request_irq()
1594 * has been called.
1595 */
irq_domain_push_irq(struct irq_domain * domain,int virq,void * arg)1596 int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
1597 {
1598 struct irq_data *irq_data = irq_get_irq_data(virq);
1599 struct irq_data *parent_irq_data;
1600 struct irq_desc *desc;
1601 int rv = 0;
1602
1603 /*
1604 * Check that no action has been set, which indicates the virq
1605 * is in a state where this function doesn't have to deal with
1606 * races between interrupt handling and maintaining the
1607 * hierarchy. This will catch gross misuse. Attempting to
1608 * make the check race free would require holding locks across
1609 * calls to struct irq_domain_ops->alloc(), which could lead
1610 * to deadlock, so we just do a simple check before starting.
1611 */
1612 desc = irq_to_desc(virq);
1613 if (!desc)
1614 return -EINVAL;
1615 if (WARN_ON(desc->action))
1616 return -EBUSY;
1617
1618 if (domain == NULL)
1619 return -EINVAL;
1620
1621 if (WARN_ON(!irq_domain_is_hierarchy(domain)))
1622 return -EINVAL;
1623
1624 if (!irq_data)
1625 return -EINVAL;
1626
1627 if (domain->parent != irq_data->domain)
1628 return -EINVAL;
1629
1630 parent_irq_data = kzalloc_node(sizeof(*parent_irq_data), GFP_KERNEL,
1631 irq_data_get_node(irq_data));
1632 if (!parent_irq_data)
1633 return -ENOMEM;
1634
1635 mutex_lock(&domain->root->mutex);
1636
1637 /* Copy the original irq_data. */
1638 *parent_irq_data = *irq_data;
1639
1640 /*
1641 * Overwrite the irq_data, which is embedded in struct irq_desc, with
1642 * values for this domain.
1643 */
1644 irq_data->parent_data = parent_irq_data;
1645 irq_data->domain = domain;
1646 irq_data->mask = 0;
1647 irq_data->hwirq = 0;
1648 irq_data->chip = NULL;
1649 irq_data->chip_data = NULL;
1650
1651 /* May (probably does) set hwirq, chip, etc. */
1652 rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
1653 if (rv) {
1654 /* Restore the original irq_data. */
1655 *irq_data = *parent_irq_data;
1656 kfree(parent_irq_data);
1657 goto error;
1658 }
1659
1660 irq_domain_fix_revmap(parent_irq_data);
1661 irq_domain_set_mapping(domain, irq_data->hwirq, irq_data);
1662 error:
1663 mutex_unlock(&domain->root->mutex);
1664
1665 return rv;
1666 }
1667 EXPORT_SYMBOL_GPL(irq_domain_push_irq);
1668
1669 /**
1670 * irq_domain_pop_irq() - Remove a domain from the top of a hierarchy.
1671 * @domain: Domain to remove.
1672 * @virq: Irq to remove the domain from.
1673 *
1674 * Undo the effects of a call to irq_domain_push_irq(). Must be
1675 * called either before request_irq() or after free_irq().
1676 */
irq_domain_pop_irq(struct irq_domain * domain,int virq)1677 int irq_domain_pop_irq(struct irq_domain *domain, int virq)
1678 {
1679 struct irq_data *irq_data = irq_get_irq_data(virq);
1680 struct irq_data *parent_irq_data;
1681 struct irq_data *tmp_irq_data;
1682 struct irq_desc *desc;
1683
1684 /*
1685 * Check that no action is set, which indicates the virq is in
1686 * a state where this function doesn't have to deal with races
1687 * between interrupt handling and maintaining the hierarchy.
1688 * This will catch gross misuse. Attempting to make the check
1689 * race free would require holding locks across calls to
1690 * struct irq_domain_ops->free(), which could lead to
1691 * deadlock, so we just do a simple check before starting.
1692 */
1693 desc = irq_to_desc(virq);
1694 if (!desc)
1695 return -EINVAL;
1696 if (WARN_ON(desc->action))
1697 return -EBUSY;
1698
1699 if (domain == NULL)
1700 return -EINVAL;
1701
1702 if (!irq_data)
1703 return -EINVAL;
1704
1705 tmp_irq_data = irq_domain_get_irq_data(domain, virq);
1706
1707 /* We can only "pop" if this domain is at the top of the list */
1708 if (WARN_ON(irq_data != tmp_irq_data))
1709 return -EINVAL;
1710
1711 if (WARN_ON(irq_data->domain != domain))
1712 return -EINVAL;
1713
1714 parent_irq_data = irq_data->parent_data;
1715 if (WARN_ON(!parent_irq_data))
1716 return -EINVAL;
1717
1718 mutex_lock(&domain->root->mutex);
1719
1720 irq_data->parent_data = NULL;
1721
1722 irq_domain_clear_mapping(domain, irq_data->hwirq);
1723 irq_domain_free_irqs_hierarchy(domain, virq, 1);
1724
1725 /* Restore the original irq_data. */
1726 *irq_data = *parent_irq_data;
1727
1728 irq_domain_fix_revmap(irq_data);
1729
1730 mutex_unlock(&domain->root->mutex);
1731
1732 kfree(parent_irq_data);
1733
1734 return 0;
1735 }
1736 EXPORT_SYMBOL_GPL(irq_domain_pop_irq);
1737
1738 /**
1739 * irq_domain_free_irqs - Free IRQ number and associated data structures
1740 * @virq: base IRQ number
1741 * @nr_irqs: number of IRQs to free
1742 */
irq_domain_free_irqs(unsigned int virq,unsigned int nr_irqs)1743 void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1744 {
1745 struct irq_data *data = irq_get_irq_data(virq);
1746 struct irq_domain *domain;
1747 int i;
1748
1749 if (WARN(!data || !data->domain || !data->domain->ops->free,
1750 "NULL pointer, cannot free irq\n"))
1751 return;
1752
1753 domain = data->domain;
1754
1755 mutex_lock(&domain->root->mutex);
1756 for (i = 0; i < nr_irqs; i++)
1757 irq_domain_remove_irq(virq + i);
1758 irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
1759 mutex_unlock(&domain->root->mutex);
1760
1761 irq_domain_free_irq_data(virq, nr_irqs);
1762 irq_free_descs(virq, nr_irqs);
1763 }
1764
irq_domain_free_one_irq(struct irq_domain * domain,unsigned int virq)1765 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq)
1766 {
1767 if (irq_domain_is_msi_device(domain))
1768 msi_device_domain_free_wired(domain, virq);
1769 else
1770 irq_domain_free_irqs(virq, 1);
1771 }
1772
1773 /**
1774 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1775 * @domain: Domain below which interrupts must be allocated
1776 * @irq_base: Base IRQ number
1777 * @nr_irqs: Number of IRQs to allocate
1778 * @arg: Allocation data (arch/domain specific)
1779 */
irq_domain_alloc_irqs_parent(struct irq_domain * domain,unsigned int irq_base,unsigned int nr_irqs,void * arg)1780 int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1781 unsigned int irq_base, unsigned int nr_irqs,
1782 void *arg)
1783 {
1784 if (!domain->parent)
1785 return -ENOSYS;
1786
1787 return irq_domain_alloc_irqs_hierarchy(domain->parent, irq_base,
1788 nr_irqs, arg);
1789 }
1790 EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1791
1792 /**
1793 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1794 * @domain: Domain below which interrupts must be freed
1795 * @irq_base: Base IRQ number
1796 * @nr_irqs: Number of IRQs to free
1797 */
irq_domain_free_irqs_parent(struct irq_domain * domain,unsigned int irq_base,unsigned int nr_irqs)1798 void irq_domain_free_irqs_parent(struct irq_domain *domain,
1799 unsigned int irq_base, unsigned int nr_irqs)
1800 {
1801 if (!domain->parent)
1802 return;
1803
1804 irq_domain_free_irqs_hierarchy(domain->parent, irq_base, nr_irqs);
1805 }
1806 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1807
__irq_domain_deactivate_irq(struct irq_data * irq_data)1808 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
1809 {
1810 if (irq_data && irq_data->domain) {
1811 struct irq_domain *domain = irq_data->domain;
1812
1813 if (domain->ops->deactivate)
1814 domain->ops->deactivate(domain, irq_data);
1815 if (irq_data->parent_data)
1816 __irq_domain_deactivate_irq(irq_data->parent_data);
1817 }
1818 }
1819
__irq_domain_activate_irq(struct irq_data * irqd,bool reserve)1820 static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
1821 {
1822 int ret = 0;
1823
1824 if (irqd && irqd->domain) {
1825 struct irq_domain *domain = irqd->domain;
1826
1827 if (irqd->parent_data)
1828 ret = __irq_domain_activate_irq(irqd->parent_data,
1829 reserve);
1830 if (!ret && domain->ops->activate) {
1831 ret = domain->ops->activate(domain, irqd, reserve);
1832 /* Rollback in case of error */
1833 if (ret && irqd->parent_data)
1834 __irq_domain_deactivate_irq(irqd->parent_data);
1835 }
1836 }
1837 return ret;
1838 }
1839
1840 /**
1841 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1842 * interrupt
1843 * @irq_data: Outermost irq_data associated with interrupt
1844 * @reserve: If set only reserve an interrupt vector instead of assigning one
1845 *
1846 * This is the second step to call domain_ops->activate to program interrupt
1847 * controllers, so the interrupt could actually get delivered.
1848 */
irq_domain_activate_irq(struct irq_data * irq_data,bool reserve)1849 int irq_domain_activate_irq(struct irq_data *irq_data, bool reserve)
1850 {
1851 int ret = 0;
1852
1853 if (!irqd_is_activated(irq_data))
1854 ret = __irq_domain_activate_irq(irq_data, reserve);
1855 if (!ret)
1856 irqd_set_activated(irq_data);
1857 return ret;
1858 }
1859
1860 /**
1861 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1862 * deactivate interrupt
1863 * @irq_data: outermost irq_data associated with interrupt
1864 *
1865 * It calls domain_ops->deactivate to program interrupt controllers to disable
1866 * interrupt delivery.
1867 */
irq_domain_deactivate_irq(struct irq_data * irq_data)1868 void irq_domain_deactivate_irq(struct irq_data *irq_data)
1869 {
1870 if (irqd_is_activated(irq_data)) {
1871 __irq_domain_deactivate_irq(irq_data);
1872 irqd_clr_activated(irq_data);
1873 }
1874 }
1875
irq_domain_check_hierarchy(struct irq_domain * domain)1876 static void irq_domain_check_hierarchy(struct irq_domain *domain)
1877 {
1878 /* Hierarchy irq_domains must implement callback alloc() */
1879 if (domain->ops->alloc)
1880 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1881 }
1882 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1883 /**
1884 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1885 * @domain: domain to match
1886 * @virq: IRQ number to get irq_data
1887 */
irq_domain_get_irq_data(struct irq_domain * domain,unsigned int virq)1888 struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1889 unsigned int virq)
1890 {
1891 struct irq_data *irq_data = irq_get_irq_data(virq);
1892
1893 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1894 }
1895 EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1896
1897 /**
1898 * irq_domain_set_info - Set the complete data for a @virq in @domain
1899 * @domain: Interrupt domain to match
1900 * @virq: IRQ number
1901 * @hwirq: The hardware interrupt number
1902 * @chip: The associated interrupt chip
1903 * @chip_data: The associated interrupt chip data
1904 * @handler: The interrupt flow handler
1905 * @handler_data: The interrupt flow handler data
1906 * @handler_name: The interrupt handler name
1907 */
irq_domain_set_info(struct irq_domain * domain,unsigned int virq,irq_hw_number_t hwirq,const struct irq_chip * chip,void * chip_data,irq_flow_handler_t handler,void * handler_data,const char * handler_name)1908 void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1909 irq_hw_number_t hwirq, const struct irq_chip *chip,
1910 void *chip_data, irq_flow_handler_t handler,
1911 void *handler_data, const char *handler_name)
1912 {
1913 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1914 irq_set_chip_data(virq, chip_data);
1915 irq_set_handler_data(virq, handler_data);
1916 }
1917
irq_domain_alloc_irqs_locked(struct irq_domain * domain,int irq_base,unsigned int nr_irqs,int node,void * arg,bool realloc,const struct irq_affinity_desc * affinity)1918 static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
1919 unsigned int nr_irqs, int node, void *arg,
1920 bool realloc, const struct irq_affinity_desc *affinity)
1921 {
1922 return -EINVAL;
1923 }
1924
irq_domain_check_hierarchy(struct irq_domain * domain)1925 static void irq_domain_check_hierarchy(struct irq_domain *domain) { }
irq_domain_free_one_irq(struct irq_domain * domain,unsigned int virq)1926 static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq) { }
1927
1928 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1929
1930 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
1931 #include "internals.h"
1932
1933 static struct dentry *domain_dir;
1934
1935 static void
irq_domain_debug_show_one(struct seq_file * m,struct irq_domain * d,int ind)1936 irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind)
1937 {
1938 seq_printf(m, "%*sname: %s\n", ind, "", d->name);
1939 seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size);
1940 seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount);
1941 seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags);
1942 if (d->ops && d->ops->debug_show)
1943 d->ops->debug_show(m, d, NULL, ind + 1);
1944 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
1945 if (!d->parent)
1946 return;
1947 seq_printf(m, "%*sparent: %s\n", ind + 1, "", d->parent->name);
1948 irq_domain_debug_show_one(m, d->parent, ind + 4);
1949 #endif
1950 }
1951
irq_domain_debug_show(struct seq_file * m,void * p)1952 static int irq_domain_debug_show(struct seq_file *m, void *p)
1953 {
1954 struct irq_domain *d = m->private;
1955
1956 /* Default domain? Might be NULL */
1957 if (!d) {
1958 if (!irq_default_domain)
1959 return 0;
1960 d = irq_default_domain;
1961 }
1962 irq_domain_debug_show_one(m, d, 0);
1963 return 0;
1964 }
1965 DEFINE_SHOW_ATTRIBUTE(irq_domain_debug);
1966
debugfs_add_domain_dir(struct irq_domain * d)1967 static void debugfs_add_domain_dir(struct irq_domain *d)
1968 {
1969 if (!d->name || !domain_dir)
1970 return;
1971 debugfs_create_file(d->name, 0444, domain_dir, d,
1972 &irq_domain_debug_fops);
1973 }
1974
debugfs_remove_domain_dir(struct irq_domain * d)1975 static void debugfs_remove_domain_dir(struct irq_domain *d)
1976 {
1977 debugfs_lookup_and_remove(d->name, domain_dir);
1978 }
1979
irq_domain_debugfs_init(struct dentry * root)1980 void __init irq_domain_debugfs_init(struct dentry *root)
1981 {
1982 struct irq_domain *d;
1983
1984 domain_dir = debugfs_create_dir("domains", root);
1985
1986 debugfs_create_file("default", 0444, domain_dir, NULL,
1987 &irq_domain_debug_fops);
1988 mutex_lock(&irq_domain_mutex);
1989 list_for_each_entry(d, &irq_domain_list, link)
1990 debugfs_add_domain_dir(d);
1991 mutex_unlock(&irq_domain_mutex);
1992 }
1993 #endif
1994