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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
20static LIST_HEAD(irq_domain_list);
21static DEFINE_MUTEX(irq_domain_mutex);
22
23static DEFINE_MUTEX(revmap_trees_mutex);
24static struct irq_domain *irq_default_domain;
25
26static void irq_domain_check_hierarchy(struct irq_domain *domain);
27
28struct 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 */
42struct 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}
61EXPORT_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 */
68void 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}
79EXPORT_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 */
94struct 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}
128EXPORT_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 */
138void irq_domain_remove(struct irq_domain *domain)
139{
140 mutex_lock(&irq_domain_mutex);
141
142 /*
143 * radix_tree_delete() takes care of destroying the root
144 * node when all entries are removed. Shout if there are
145 * any mappings left.
146 */
147 WARN_ON(domain->revmap_tree.height);
148
149 list_del(&domain->link);
150
151 /*
152 * If the going away domain is the default one, reset it.
153 */
154 if (unlikely(irq_default_domain == domain))
155 irq_set_default_host(NULL);
156
157 mutex_unlock(&irq_domain_mutex);
158
159 pr_debug("Removed domain %s\n", domain->name);
160
161 of_node_put(irq_domain_get_of_node(domain));
162 kfree(domain);
163}
164EXPORT_SYMBOL_GPL(irq_domain_remove);
165
166/**
167 * irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
168 * @of_node: pointer to interrupt controller's device tree node.
169 * @size: total number of irqs in mapping
170 * @first_irq: first number of irq block assigned to the domain,
171 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
172 * pre-map all of the irqs in the domain to virqs starting at first_irq.
173 * @ops: domain callbacks
174 * @host_data: Controller private data pointer
175 *
176 * Allocates an irq_domain, and optionally if first_irq is positive then also
177 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
178 *
179 * This is intended to implement the expected behaviour for most
180 * interrupt controllers. If device tree is used, then first_irq will be 0 and
181 * irqs get mapped dynamically on the fly. However, if the controller requires
182 * static virq assignments (non-DT boot) then it will set that up correctly.
183 */
184struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
185 unsigned int size,
186 unsigned int first_irq,
187 const struct irq_domain_ops *ops,
188 void *host_data)
189{
190 struct irq_domain *domain;
191
192 domain = __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
193 if (!domain)
194 return NULL;
195
196 if (first_irq > 0) {
197 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
198 /* attempt to allocated irq_descs */
199 int rc = irq_alloc_descs(first_irq, first_irq, size,
200 of_node_to_nid(of_node));
201 if (rc < 0)
202 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
203 first_irq);
204 }
205 irq_domain_associate_many(domain, first_irq, 0, size);
206 }
207
208 return domain;
209}
210EXPORT_SYMBOL_GPL(irq_domain_add_simple);
211
212/**
213 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
214 * @of_node: pointer to interrupt controller's device tree node.
215 * @size: total number of irqs in legacy mapping
216 * @first_irq: first number of irq block assigned to the domain
217 * @first_hwirq: first hwirq number to use for the translation. Should normally
218 * be '0', but a positive integer can be used if the effective
219 * hwirqs numbering does not begin at zero.
220 * @ops: map/unmap domain callbacks
221 * @host_data: Controller private data pointer
222 *
223 * Note: the map() callback will be called before this function returns
224 * for all legacy interrupts except 0 (which is always the invalid irq for
225 * a legacy controller).
226 */
227struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
228 unsigned int size,
229 unsigned int first_irq,
230 irq_hw_number_t first_hwirq,
231 const struct irq_domain_ops *ops,
232 void *host_data)
233{
234 struct irq_domain *domain;
235
236 domain = __irq_domain_add(of_node_to_fwnode(of_node), first_hwirq + size,
237 first_hwirq + size, 0, ops, host_data);
238 if (domain)
239 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
240
241 return domain;
242}
243EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
244
245/**
246 * irq_find_matching_fwnode() - Locates a domain for a given fwnode
247 * @fwnode: FW descriptor of the interrupt controller
248 * @bus_token: domain-specific data
249 */
250struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
251 enum irq_domain_bus_token bus_token)
252{
253 struct irq_domain *h, *found = NULL;
254 int rc;
255
256 /* We might want to match the legacy controller last since
257 * it might potentially be set to match all interrupts in
258 * the absence of a device node. This isn't a problem so far
259 * yet though...
260 *
261 * bus_token == DOMAIN_BUS_ANY matches any domain, any other
262 * values must generate an exact match for the domain to be
263 * selected.
264 */
265 mutex_lock(&irq_domain_mutex);
266 list_for_each_entry(h, &irq_domain_list, link) {
267 if (h->ops->match)
268 rc = h->ops->match(h, to_of_node(fwnode), bus_token);
269 else
270 rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
271 ((bus_token == DOMAIN_BUS_ANY) ||
272 (h->bus_token == bus_token)));
273
274 if (rc) {
275 found = h;
276 break;
277 }
278 }
279 mutex_unlock(&irq_domain_mutex);
280 return found;
281}
282EXPORT_SYMBOL_GPL(irq_find_matching_fwnode);
283
284/**
285 * irq_set_default_host() - Set a "default" irq domain
286 * @domain: default domain pointer
287 *
288 * For convenience, it's possible to set a "default" domain that will be used
289 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
290 * platforms that want to manipulate a few hard coded interrupt numbers that
291 * aren't properly represented in the device-tree.
292 */
293void irq_set_default_host(struct irq_domain *domain)
294{
295 pr_debug("Default domain set to @0x%p\n", domain);
296
297 irq_default_domain = domain;
298}
299EXPORT_SYMBOL_GPL(irq_set_default_host);
300
301void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
302{
303 struct irq_data *irq_data = irq_get_irq_data(irq);
304 irq_hw_number_t hwirq;
305
306 if (WARN(!irq_data || irq_data->domain != domain,
307 "virq%i doesn't exist; cannot disassociate\n", irq))
308 return;
309
310 hwirq = irq_data->hwirq;
311 irq_set_status_flags(irq, IRQ_NOREQUEST);
312
313 /* remove chip and handler */
314 irq_set_chip_and_handler(irq, NULL, NULL);
315
316 /* Make sure it's completed */
317 synchronize_irq(irq);
318
319 /* Tell the PIC about it */
320 if (domain->ops->unmap)
321 domain->ops->unmap(domain, irq);
322 smp_mb();
323
324 irq_data->domain = NULL;
325 irq_data->hwirq = 0;
326
327 /* Clear reverse map for this hwirq */
328 if (hwirq < domain->revmap_size) {
329 domain->linear_revmap[hwirq] = 0;
330 } else {
331 mutex_lock(&revmap_trees_mutex);
332 radix_tree_delete(&domain->revmap_tree, hwirq);
333 mutex_unlock(&revmap_trees_mutex);
334 }
335}
336
337int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
338 irq_hw_number_t hwirq)
339{
340 struct irq_data *irq_data = irq_get_irq_data(virq);
341 int ret;
342
343 if (WARN(hwirq >= domain->hwirq_max,
344 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
345 return -EINVAL;
346 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
347 return -EINVAL;
348 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
349 return -EINVAL;
350
351 mutex_lock(&irq_domain_mutex);
352 irq_data->hwirq = hwirq;
353 irq_data->domain = domain;
354 if (domain->ops->map) {
355 ret = domain->ops->map(domain, virq, hwirq);
356 if (ret != 0) {
357 /*
358 * If map() returns -EPERM, this interrupt is protected
359 * by the firmware or some other service and shall not
360 * be mapped. Don't bother telling the user about it.
361 */
362 if (ret != -EPERM) {
363 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
364 domain->name, hwirq, virq, ret);
365 }
366 irq_data->domain = NULL;
367 irq_data->hwirq = 0;
368 mutex_unlock(&irq_domain_mutex);
369 return ret;
370 }
371
372 /* If not already assigned, give the domain the chip's name */
373 if (!domain->name && irq_data->chip)
374 domain->name = irq_data->chip->name;
375 }
376
377 if (hwirq < domain->revmap_size) {
378 domain->linear_revmap[hwirq] = virq;
379 } else {
380 mutex_lock(&revmap_trees_mutex);
381 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
382 mutex_unlock(&revmap_trees_mutex);
383 }
384 mutex_unlock(&irq_domain_mutex);
385
386 irq_clear_status_flags(virq, IRQ_NOREQUEST);
387
388 return 0;
389}
390EXPORT_SYMBOL_GPL(irq_domain_associate);
391
392void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
393 irq_hw_number_t hwirq_base, int count)
394{
395 struct device_node *of_node;
396 int i;
397
398 of_node = irq_domain_get_of_node(domain);
399 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
400 of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
401
402 for (i = 0; i < count; i++) {
403 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
404 }
405}
406EXPORT_SYMBOL_GPL(irq_domain_associate_many);
407
408/**
409 * irq_create_direct_mapping() - Allocate an irq for direct mapping
410 * @domain: domain to allocate the irq for or NULL for default domain
411 *
412 * This routine is used for irq controllers which can choose the hardware
413 * interrupt numbers they generate. In such a case it's simplest to use
414 * the linux irq as the hardware interrupt number. It still uses the linear
415 * or radix tree to store the mapping, but the irq controller can optimize
416 * the revmap path by using the hwirq directly.
417 */
418unsigned int irq_create_direct_mapping(struct irq_domain *domain)
419{
420 struct device_node *of_node;
421 unsigned int virq;
422
423 if (domain == NULL)
424 domain = irq_default_domain;
425
426 of_node = irq_domain_get_of_node(domain);
427 virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
428 if (!virq) {
429 pr_debug("create_direct virq allocation failed\n");
430 return 0;
431 }
432 if (virq >= domain->revmap_direct_max_irq) {
433 pr_err("ERROR: no free irqs available below %i maximum\n",
434 domain->revmap_direct_max_irq);
435 irq_free_desc(virq);
436 return 0;
437 }
438 pr_debug("create_direct obtained virq %d\n", virq);
439
440 if (irq_domain_associate(domain, virq, virq)) {
441 irq_free_desc(virq);
442 return 0;
443 }
444
445 return virq;
446}
447EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
448
449/**
450 * irq_create_mapping() - Map a hardware interrupt into linux irq space
451 * @domain: domain owning this hardware interrupt or NULL for default domain
452 * @hwirq: hardware irq number in that domain space
453 *
454 * Only one mapping per hardware interrupt is permitted. Returns a linux
455 * irq number.
456 * If the sense/trigger is to be specified, set_irq_type() should be called
457 * on the number returned from that call.
458 */
459unsigned int irq_create_mapping(struct irq_domain *domain,
460 irq_hw_number_t hwirq)
461{
462 struct device_node *of_node;
463 int virq;
464
465 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
466
467 /* Look for default domain if nececssary */
468 if (domain == NULL)
469 domain = irq_default_domain;
470 if (domain == NULL) {
471 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
472 return 0;
473 }
474 pr_debug("-> using domain @%p\n", domain);
475
476 of_node = irq_domain_get_of_node(domain);
477
478 /* Check if mapping already exists */
479 virq = irq_find_mapping(domain, hwirq);
480 if (virq) {
481 pr_debug("-> existing mapping on virq %d\n", virq);
482 return virq;
483 }
484
485 /* Allocate a virtual interrupt number */
486 virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node));
487 if (virq <= 0) {
488 pr_debug("-> virq allocation failed\n");
489 return 0;
490 }
491
492 if (irq_domain_associate(domain, virq, hwirq)) {
493 irq_free_desc(virq);
494 return 0;
495 }
496
497 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
498 hwirq, of_node_full_name(of_node), virq);
499
500 return virq;
501}
502EXPORT_SYMBOL_GPL(irq_create_mapping);
503
504/**
505 * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
506 * @domain: domain owning the interrupt range
507 * @irq_base: beginning of linux IRQ range
508 * @hwirq_base: beginning of hardware IRQ range
509 * @count: Number of interrupts to map
510 *
511 * This routine is used for allocating and mapping a range of hardware
512 * irqs to linux irqs where the linux irq numbers are at pre-defined
513 * locations. For use by controllers that already have static mappings
514 * to insert in to the domain.
515 *
516 * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
517 * domain insertion.
518 *
519 * 0 is returned upon success, while any failure to establish a static
520 * mapping is treated as an error.
521 */
522int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
523 irq_hw_number_t hwirq_base, int count)
524{
525 struct device_node *of_node;
526 int ret;
527
528 of_node = irq_domain_get_of_node(domain);
529 ret = irq_alloc_descs(irq_base, irq_base, count,
530 of_node_to_nid(of_node));
531 if (unlikely(ret < 0))
532 return ret;
533
534 irq_domain_associate_many(domain, irq_base, hwirq_base, count);
535 return 0;
536}
537EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
538
539static int irq_domain_translate(struct irq_domain *d,
540 struct irq_fwspec *fwspec,
541 irq_hw_number_t *hwirq, unsigned int *type)
542{
543#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
544 if (d->ops->translate)
545 return d->ops->translate(d, fwspec, hwirq, type);
546#endif
547 if (d->ops->xlate)
548 return d->ops->xlate(d, to_of_node(fwspec->fwnode),
549 fwspec->param, fwspec->param_count,
550 hwirq, type);
551
552 /* If domain has no translation, then we assume interrupt line */
553 *hwirq = fwspec->param[0];
554 return 0;
555}
556
557static void of_phandle_args_to_fwspec(struct of_phandle_args *irq_data,
558 struct irq_fwspec *fwspec)
559{
560 int i;
561
562 fwspec->fwnode = irq_data->np ? &irq_data->np->fwnode : NULL;
563 fwspec->param_count = irq_data->args_count;
564
565 for (i = 0; i < irq_data->args_count; i++)
566 fwspec->param[i] = irq_data->args[i];
567}
568
569unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
570{
571 struct irq_domain *domain;
572 irq_hw_number_t hwirq;
573 unsigned int type = IRQ_TYPE_NONE;
574 int virq;
575
576 if (fwspec->fwnode) {
577 domain = irq_find_matching_fwnode(fwspec->fwnode,
578 DOMAIN_BUS_WIRED);
579 if (!domain)
580 domain = irq_find_matching_fwnode(fwspec->fwnode,
581 DOMAIN_BUS_ANY);
582 } else {
583 domain = irq_default_domain;
584 }
585
586 if (!domain) {
587 pr_warn("no irq domain found for %s !\n",
588 of_node_full_name(to_of_node(fwspec->fwnode)));
589 return 0;
590 }
591
592 if (irq_domain_translate(domain, fwspec, &hwirq, &type))
593 return 0;
594
595 if (irq_domain_is_hierarchy(domain)) {
596 /*
597 * If we've already configured this interrupt,
598 * don't do it again, or hell will break loose.
599 */
600 virq = irq_find_mapping(domain, hwirq);
601 if (virq)
602 return virq;
603
604 virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
605 if (virq <= 0)
606 return 0;
607 } else {
608 /* Create mapping */
609 virq = irq_create_mapping(domain, hwirq);
610 if (!virq)
611 return virq;
612 }
613
614 /* Set type if specified and different than the current one */
615 if (type != IRQ_TYPE_NONE &&
616 type != irq_get_trigger_type(virq))
617 irq_set_irq_type(virq, type);
618 return virq;
619}
620EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
621
622unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
623{
624 struct irq_fwspec fwspec;
625
626 of_phandle_args_to_fwspec(irq_data, &fwspec);
627 return irq_create_fwspec_mapping(&fwspec);
628}
629EXPORT_SYMBOL_GPL(irq_create_of_mapping);
630
631/**
632 * irq_dispose_mapping() - Unmap an interrupt
633 * @virq: linux irq number of the interrupt to unmap
634 */
635void irq_dispose_mapping(unsigned int virq)
636{
637 struct irq_data *irq_data = irq_get_irq_data(virq);
638 struct irq_domain *domain;
639
640 if (!virq || !irq_data)
641 return;
642
643 domain = irq_data->domain;
644 if (WARN_ON(domain == NULL))
645 return;
646
647 irq_domain_disassociate(domain, virq);
648 irq_free_desc(virq);
649}
650EXPORT_SYMBOL_GPL(irq_dispose_mapping);
651
652/**
653 * irq_find_mapping() - Find a linux irq from an hw irq number.
654 * @domain: domain owning this hardware interrupt
655 * @hwirq: hardware irq number in that domain space
656 */
657unsigned int irq_find_mapping(struct irq_domain *domain,
658 irq_hw_number_t hwirq)
659{
660 struct irq_data *data;
661
662 /* Look for default domain if nececssary */
663 if (domain == NULL)
664 domain = irq_default_domain;
665 if (domain == NULL)
666 return 0;
667
668 if (hwirq < domain->revmap_direct_max_irq) {
669 data = irq_domain_get_irq_data(domain, hwirq);
670 if (data && data->hwirq == hwirq)
671 return hwirq;
672 }
673
674 /* Check if the hwirq is in the linear revmap. */
675 if (hwirq < domain->revmap_size)
676 return domain->linear_revmap[hwirq];
677
678 rcu_read_lock();
679 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
680 rcu_read_unlock();
681 return data ? data->irq : 0;
682}
683EXPORT_SYMBOL_GPL(irq_find_mapping);
684
685#ifdef CONFIG_IRQ_DOMAIN_DEBUG
686static int virq_debug_show(struct seq_file *m, void *private)
687{
688 unsigned long flags;
689 struct irq_desc *desc;
690 struct irq_domain *domain;
691 struct radix_tree_iter iter;
692 void *data, **slot;
693 int i;
694
695 seq_printf(m, " %-16s %-6s %-10s %-10s %s\n",
696 "name", "mapped", "linear-max", "direct-max", "devtree-node");
697 mutex_lock(&irq_domain_mutex);
698 list_for_each_entry(domain, &irq_domain_list, link) {
699 struct device_node *of_node;
700 int count = 0;
701 of_node = irq_domain_get_of_node(domain);
702 radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0)
703 count++;
704 seq_printf(m, "%c%-16s %6u %10u %10u %s\n",
705 domain == irq_default_domain ? '*' : ' ', domain->name,
706 domain->revmap_size + count, domain->revmap_size,
707 domain->revmap_direct_max_irq,
708 of_node ? of_node_full_name(of_node) : "");
709 }
710 mutex_unlock(&irq_domain_mutex);
711
712 seq_printf(m, "%-5s %-7s %-15s %-*s %6s %-14s %s\n", "irq", "hwirq",
713 "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
714 "active", "type", "domain");
715
716 for (i = 1; i < nr_irqs; i++) {
717 desc = irq_to_desc(i);
718 if (!desc)
719 continue;
720
721 raw_spin_lock_irqsave(&desc->lock, flags);
722 domain = desc->irq_data.domain;
723
724 if (domain) {
725 struct irq_chip *chip;
726 int hwirq = desc->irq_data.hwirq;
727 bool direct;
728
729 seq_printf(m, "%5d ", i);
730 seq_printf(m, "0x%05x ", hwirq);
731
732 chip = irq_desc_get_chip(desc);
733 seq_printf(m, "%-15s ", (chip && chip->name) ? chip->name : "none");
734
735 data = irq_desc_get_chip_data(desc);
736 seq_printf(m, data ? "0x%p " : " %p ", data);
737
738 seq_printf(m, " %c ", (desc->action && desc->action->handler) ? '*' : ' ');
739 direct = (i == hwirq) && (i < domain->revmap_direct_max_irq);
740 seq_printf(m, "%6s%-8s ",
741 (hwirq < domain->revmap_size) ? "LINEAR" : "RADIX",
742 direct ? "(DIRECT)" : "");
743 seq_printf(m, "%s\n", desc->irq_data.domain->name);
744 }
745
746 raw_spin_unlock_irqrestore(&desc->lock, flags);
747 }
748
749 return 0;
750}
751
752static int virq_debug_open(struct inode *inode, struct file *file)
753{
754 return single_open(file, virq_debug_show, inode->i_private);
755}
756
757static const struct file_operations virq_debug_fops = {
758 .open = virq_debug_open,
759 .read = seq_read,
760 .llseek = seq_lseek,
761 .release = single_release,
762};
763
764static int __init irq_debugfs_init(void)
765{
766 if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
767 NULL, &virq_debug_fops) == NULL)
768 return -ENOMEM;
769
770 return 0;
771}
772__initcall(irq_debugfs_init);
773#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
774
775/**
776 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
777 *
778 * Device Tree IRQ specifier translation function which works with one cell
779 * bindings where the cell value maps directly to the hwirq number.
780 */
781int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
782 const u32 *intspec, unsigned int intsize,
783 unsigned long *out_hwirq, unsigned int *out_type)
784{
785 if (WARN_ON(intsize < 1))
786 return -EINVAL;
787 *out_hwirq = intspec[0];
788 *out_type = IRQ_TYPE_NONE;
789 return 0;
790}
791EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
792
793/**
794 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
795 *
796 * Device Tree IRQ specifier translation function which works with two cell
797 * bindings where the cell values map directly to the hwirq number
798 * and linux irq flags.
799 */
800int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
801 const u32 *intspec, unsigned int intsize,
802 irq_hw_number_t *out_hwirq, unsigned int *out_type)
803{
804 if (WARN_ON(intsize < 2))
805 return -EINVAL;
806 *out_hwirq = intspec[0];
807 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
808 return 0;
809}
810EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
811
812/**
813 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
814 *
815 * Device Tree IRQ specifier translation function which works with either one
816 * or two cell bindings where the cell values map directly to the hwirq number
817 * and linux irq flags.
818 *
819 * Note: don't use this function unless your interrupt controller explicitly
820 * supports both one and two cell bindings. For the majority of controllers
821 * the _onecell() or _twocell() variants above should be used.
822 */
823int irq_domain_xlate_onetwocell(struct irq_domain *d,
824 struct device_node *ctrlr,
825 const u32 *intspec, unsigned int intsize,
826 unsigned long *out_hwirq, unsigned int *out_type)
827{
828 if (WARN_ON(intsize < 1))
829 return -EINVAL;
830 *out_hwirq = intspec[0];
831 *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
832 return 0;
833}
834EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
835
836const struct irq_domain_ops irq_domain_simple_ops = {
837 .xlate = irq_domain_xlate_onetwocell,
838};
839EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
840
841int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq,
842 int node)
843{
844 unsigned int hint;
845
846 if (virq >= 0) {
847 virq = irq_alloc_descs(virq, virq, cnt, node);
848 } else {
849 hint = hwirq % nr_irqs;
850 if (hint == 0)
851 hint++;
852 virq = irq_alloc_descs_from(hint, cnt, node);
853 if (virq <= 0 && hint > 1)
854 virq = irq_alloc_descs_from(1, cnt, node);
855 }
856
857 return virq;
858}
859
860#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
861/**
862 * irq_domain_create_hierarchy - Add a irqdomain into the hierarchy
863 * @parent: Parent irq domain to associate with the new domain
864 * @flags: Irq domain flags associated to the domain
865 * @size: Size of the domain. See below
866 * @fwnode: Optional fwnode of the interrupt controller
867 * @ops: Pointer to the interrupt domain callbacks
868 * @host_data: Controller private data pointer
869 *
870 * If @size is 0 a tree domain is created, otherwise a linear domain.
871 *
872 * If successful the parent is associated to the new domain and the
873 * domain flags are set.
874 * Returns pointer to IRQ domain, or NULL on failure.
875 */
876struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
877 unsigned int flags,
878 unsigned int size,
879 struct fwnode_handle *fwnode,
880 const struct irq_domain_ops *ops,
881 void *host_data)
882{
883 struct irq_domain *domain;
884
885 if (size)
886 domain = irq_domain_create_linear(fwnode, size, ops, host_data);
887 else
888 domain = irq_domain_create_tree(fwnode, ops, host_data);
889 if (domain) {
890 domain->parent = parent;
891 domain->flags |= flags;
892 }
893
894 return domain;
895}
896EXPORT_SYMBOL_GPL(irq_domain_create_hierarchy);
897
898static void irq_domain_insert_irq(int virq)
899{
900 struct irq_data *data;
901
902 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
903 struct irq_domain *domain = data->domain;
904 irq_hw_number_t hwirq = data->hwirq;
905
906 if (hwirq < domain->revmap_size) {
907 domain->linear_revmap[hwirq] = virq;
908 } else {
909 mutex_lock(&revmap_trees_mutex);
910 radix_tree_insert(&domain->revmap_tree, hwirq, data);
911 mutex_unlock(&revmap_trees_mutex);
912 }
913
914 /* If not already assigned, give the domain the chip's name */
915 if (!domain->name && data->chip)
916 domain->name = data->chip->name;
917 }
918
919 irq_clear_status_flags(virq, IRQ_NOREQUEST);
920}
921
922static void irq_domain_remove_irq(int virq)
923{
924 struct irq_data *data;
925
926 irq_set_status_flags(virq, IRQ_NOREQUEST);
927 irq_set_chip_and_handler(virq, NULL, NULL);
928 synchronize_irq(virq);
929 smp_mb();
930
931 for (data = irq_get_irq_data(virq); data; data = data->parent_data) {
932 struct irq_domain *domain = data->domain;
933 irq_hw_number_t hwirq = data->hwirq;
934
935 if (hwirq < domain->revmap_size) {
936 domain->linear_revmap[hwirq] = 0;
937 } else {
938 mutex_lock(&revmap_trees_mutex);
939 radix_tree_delete(&domain->revmap_tree, hwirq);
940 mutex_unlock(&revmap_trees_mutex);
941 }
942 }
943}
944
945static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain,
946 struct irq_data *child)
947{
948 struct irq_data *irq_data;
949
950 irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL,
951 irq_data_get_node(child));
952 if (irq_data) {
953 child->parent_data = irq_data;
954 irq_data->irq = child->irq;
955 irq_data->common = child->common;
956 irq_data->domain = domain;
957 }
958
959 return irq_data;
960}
961
962static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs)
963{
964 struct irq_data *irq_data, *tmp;
965 int i;
966
967 for (i = 0; i < nr_irqs; i++) {
968 irq_data = irq_get_irq_data(virq + i);
969 tmp = irq_data->parent_data;
970 irq_data->parent_data = NULL;
971 irq_data->domain = NULL;
972
973 while (tmp) {
974 irq_data = tmp;
975 tmp = tmp->parent_data;
976 kfree(irq_data);
977 }
978 }
979}
980
981static int irq_domain_alloc_irq_data(struct irq_domain *domain,
982 unsigned int virq, unsigned int nr_irqs)
983{
984 struct irq_data *irq_data;
985 struct irq_domain *parent;
986 int i;
987
988 /* The outermost irq_data is embedded in struct irq_desc */
989 for (i = 0; i < nr_irqs; i++) {
990 irq_data = irq_get_irq_data(virq + i);
991 irq_data->domain = domain;
992
993 for (parent = domain->parent; parent; parent = parent->parent) {
994 irq_data = irq_domain_insert_irq_data(parent, irq_data);
995 if (!irq_data) {
996 irq_domain_free_irq_data(virq, i + 1);
997 return -ENOMEM;
998 }
999 }
1000 }
1001
1002 return 0;
1003}
1004
1005/**
1006 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1007 * @domain: domain to match
1008 * @virq: IRQ number to get irq_data
1009 */
1010struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1011 unsigned int virq)
1012{
1013 struct irq_data *irq_data;
1014
1015 for (irq_data = irq_get_irq_data(virq); irq_data;
1016 irq_data = irq_data->parent_data)
1017 if (irq_data->domain == domain)
1018 return irq_data;
1019
1020 return NULL;
1021}
1022EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1023
1024/**
1025 * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
1026 * @domain: Interrupt domain to match
1027 * @virq: IRQ number
1028 * @hwirq: The hwirq number
1029 * @chip: The associated interrupt chip
1030 * @chip_data: The associated chip data
1031 */
1032int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq,
1033 irq_hw_number_t hwirq, struct irq_chip *chip,
1034 void *chip_data)
1035{
1036 struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
1037
1038 if (!irq_data)
1039 return -ENOENT;
1040
1041 irq_data->hwirq = hwirq;
1042 irq_data->chip = chip ? chip : &no_irq_chip;
1043 irq_data->chip_data = chip_data;
1044
1045 return 0;
1046}
1047EXPORT_SYMBOL_GPL(irq_domain_set_hwirq_and_chip);
1048
1049/**
1050 * irq_domain_set_info - Set the complete data for a @virq in @domain
1051 * @domain: Interrupt domain to match
1052 * @virq: IRQ number
1053 * @hwirq: The hardware interrupt number
1054 * @chip: The associated interrupt chip
1055 * @chip_data: The associated interrupt chip data
1056 * @handler: The interrupt flow handler
1057 * @handler_data: The interrupt flow handler data
1058 * @handler_name: The interrupt handler name
1059 */
1060void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1061 irq_hw_number_t hwirq, struct irq_chip *chip,
1062 void *chip_data, irq_flow_handler_t handler,
1063 void *handler_data, const char *handler_name)
1064{
1065 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
1066 __irq_set_handler(virq, handler, 0, handler_name);
1067 irq_set_handler_data(virq, handler_data);
1068}
1069EXPORT_SYMBOL(irq_domain_set_info);
1070
1071/**
1072 * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data
1073 * @irq_data: The pointer to irq_data
1074 */
1075void irq_domain_reset_irq_data(struct irq_data *irq_data)
1076{
1077 irq_data->hwirq = 0;
1078 irq_data->chip = &no_irq_chip;
1079 irq_data->chip_data = NULL;
1080}
1081EXPORT_SYMBOL_GPL(irq_domain_reset_irq_data);
1082
1083/**
1084 * irq_domain_free_irqs_common - Clear irq_data and free the parent
1085 * @domain: Interrupt domain to match
1086 * @virq: IRQ number to start with
1087 * @nr_irqs: The number of irqs to free
1088 */
1089void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq,
1090 unsigned int nr_irqs)
1091{
1092 struct irq_data *irq_data;
1093 int i;
1094
1095 for (i = 0; i < nr_irqs; i++) {
1096 irq_data = irq_domain_get_irq_data(domain, virq + i);
1097 if (irq_data)
1098 irq_domain_reset_irq_data(irq_data);
1099 }
1100 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
1101}
1102
1103/**
1104 * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent
1105 * @domain: Interrupt domain to match
1106 * @virq: IRQ number to start with
1107 * @nr_irqs: The number of irqs to free
1108 */
1109void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
1110 unsigned int nr_irqs)
1111{
1112 int i;
1113
1114 for (i = 0; i < nr_irqs; i++) {
1115 irq_set_handler_data(virq + i, NULL);
1116 irq_set_handler(virq + i, NULL);
1117 }
1118 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1119}
1120
1121static bool irq_domain_is_auto_recursive(struct irq_domain *domain)
1122{
1123 return domain->flags & IRQ_DOMAIN_FLAG_AUTO_RECURSIVE;
1124}
1125
1126static void irq_domain_free_irqs_recursive(struct irq_domain *domain,
1127 unsigned int irq_base,
1128 unsigned int nr_irqs)
1129{
1130 domain->ops->free(domain, irq_base, nr_irqs);
1131 if (irq_domain_is_auto_recursive(domain)) {
1132 BUG_ON(!domain->parent);
1133 irq_domain_free_irqs_recursive(domain->parent, irq_base,
1134 nr_irqs);
1135 }
1136}
1137
1138int irq_domain_alloc_irqs_recursive(struct irq_domain *domain,
1139 unsigned int irq_base,
1140 unsigned int nr_irqs, void *arg)
1141{
1142 int ret = 0;
1143 struct irq_domain *parent = domain->parent;
1144 bool recursive = irq_domain_is_auto_recursive(domain);
1145
1146 BUG_ON(recursive && !parent);
1147 if (recursive)
1148 ret = irq_domain_alloc_irqs_recursive(parent, irq_base,
1149 nr_irqs, arg);
1150 if (ret >= 0)
1151 ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg);
1152 if (ret < 0 && recursive)
1153 irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs);
1154
1155 return ret;
1156}
1157
1158/**
1159 * __irq_domain_alloc_irqs - Allocate IRQs from domain
1160 * @domain: domain to allocate from
1161 * @irq_base: allocate specified IRQ nubmer if irq_base >= 0
1162 * @nr_irqs: number of IRQs to allocate
1163 * @node: NUMA node id for memory allocation
1164 * @arg: domain specific argument
1165 * @realloc: IRQ descriptors have already been allocated if true
1166 *
1167 * Allocate IRQ numbers and initialized all data structures to support
1168 * hierarchy IRQ domains.
1169 * Parameter @realloc is mainly to support legacy IRQs.
1170 * Returns error code or allocated IRQ number
1171 *
1172 * The whole process to setup an IRQ has been split into two steps.
1173 * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ
1174 * descriptor and required hardware resources. The second step,
1175 * irq_domain_activate_irq(), is to program hardwares with preallocated
1176 * resources. In this way, it's easier to rollback when failing to
1177 * allocate resources.
1178 */
1179int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
1180 unsigned int nr_irqs, int node, void *arg,
1181 bool realloc)
1182{
1183 int i, ret, virq;
1184
1185 if (domain == NULL) {
1186 domain = irq_default_domain;
1187 if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n"))
1188 return -EINVAL;
1189 }
1190
1191 if (!domain->ops->alloc) {
1192 pr_debug("domain->ops->alloc() is NULL\n");
1193 return -ENOSYS;
1194 }
1195
1196 if (realloc && irq_base >= 0) {
1197 virq = irq_base;
1198 } else {
1199 virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node);
1200 if (virq < 0) {
1201 pr_debug("cannot allocate IRQ(base %d, count %d)\n",
1202 irq_base, nr_irqs);
1203 return virq;
1204 }
1205 }
1206
1207 if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) {
1208 pr_debug("cannot allocate memory for IRQ%d\n", virq);
1209 ret = -ENOMEM;
1210 goto out_free_desc;
1211 }
1212
1213 mutex_lock(&irq_domain_mutex);
1214 ret = irq_domain_alloc_irqs_recursive(domain, virq, nr_irqs, arg);
1215 if (ret < 0) {
1216 mutex_unlock(&irq_domain_mutex);
1217 goto out_free_irq_data;
1218 }
1219 for (i = 0; i < nr_irqs; i++)
1220 irq_domain_insert_irq(virq + i);
1221 mutex_unlock(&irq_domain_mutex);
1222
1223 return virq;
1224
1225out_free_irq_data:
1226 irq_domain_free_irq_data(virq, nr_irqs);
1227out_free_desc:
1228 irq_free_descs(virq, nr_irqs);
1229 return ret;
1230}
1231
1232/**
1233 * irq_domain_free_irqs - Free IRQ number and associated data structures
1234 * @virq: base IRQ number
1235 * @nr_irqs: number of IRQs to free
1236 */
1237void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
1238{
1239 struct irq_data *data = irq_get_irq_data(virq);
1240 int i;
1241
1242 if (WARN(!data || !data->domain || !data->domain->ops->free,
1243 "NULL pointer, cannot free irq\n"))
1244 return;
1245
1246 mutex_lock(&irq_domain_mutex);
1247 for (i = 0; i < nr_irqs; i++)
1248 irq_domain_remove_irq(virq + i);
1249 irq_domain_free_irqs_recursive(data->domain, virq, nr_irqs);
1250 mutex_unlock(&irq_domain_mutex);
1251
1252 irq_domain_free_irq_data(virq, nr_irqs);
1253 irq_free_descs(virq, nr_irqs);
1254}
1255
1256/**
1257 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
1258 * @irq_base: Base IRQ number
1259 * @nr_irqs: Number of IRQs to allocate
1260 * @arg: Allocation data (arch/domain specific)
1261 *
1262 * Check whether the domain has been setup recursive. If not allocate
1263 * through the parent domain.
1264 */
1265int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
1266 unsigned int irq_base, unsigned int nr_irqs,
1267 void *arg)
1268{
1269 /* irq_domain_alloc_irqs_recursive() has called parent's alloc() */
1270 if (irq_domain_is_auto_recursive(domain))
1271 return 0;
1272
1273 domain = domain->parent;
1274 if (domain)
1275 return irq_domain_alloc_irqs_recursive(domain, irq_base,
1276 nr_irqs, arg);
1277 return -ENOSYS;
1278}
1279EXPORT_SYMBOL_GPL(irq_domain_alloc_irqs_parent);
1280
1281/**
1282 * irq_domain_free_irqs_parent - Free interrupts from parent domain
1283 * @irq_base: Base IRQ number
1284 * @nr_irqs: Number of IRQs to free
1285 *
1286 * Check whether the domain has been setup recursive. If not free
1287 * through the parent domain.
1288 */
1289void irq_domain_free_irqs_parent(struct irq_domain *domain,
1290 unsigned int irq_base, unsigned int nr_irqs)
1291{
1292 /* irq_domain_free_irqs_recursive() will call parent's free */
1293 if (!irq_domain_is_auto_recursive(domain) && domain->parent)
1294 irq_domain_free_irqs_recursive(domain->parent, irq_base,
1295 nr_irqs);
1296}
1297EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
1298
1299/**
1300 * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
1301 * interrupt
1302 * @irq_data: outermost irq_data associated with interrupt
1303 *
1304 * This is the second step to call domain_ops->activate to program interrupt
1305 * controllers, so the interrupt could actually get delivered.
1306 */
1307void irq_domain_activate_irq(struct irq_data *irq_data)
1308{
1309 if (irq_data && irq_data->domain) {
1310 struct irq_domain *domain = irq_data->domain;
1311
1312 if (irq_data->parent_data)
1313 irq_domain_activate_irq(irq_data->parent_data);
1314 if (domain->ops->activate)
1315 domain->ops->activate(domain, irq_data);
1316 }
1317}
1318
1319/**
1320 * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to
1321 * deactivate interrupt
1322 * @irq_data: outermost irq_data associated with interrupt
1323 *
1324 * It calls domain_ops->deactivate to program interrupt controllers to disable
1325 * interrupt delivery.
1326 */
1327void irq_domain_deactivate_irq(struct irq_data *irq_data)
1328{
1329 if (irq_data && irq_data->domain) {
1330 struct irq_domain *domain = irq_data->domain;
1331
1332 if (domain->ops->deactivate)
1333 domain->ops->deactivate(domain, irq_data);
1334 if (irq_data->parent_data)
1335 irq_domain_deactivate_irq(irq_data->parent_data);
1336 }
1337}
1338
1339static void irq_domain_check_hierarchy(struct irq_domain *domain)
1340{
1341 /* Hierarchy irq_domains must implement callback alloc() */
1342 if (domain->ops->alloc)
1343 domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY;
1344}
1345#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
1346/**
1347 * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain
1348 * @domain: domain to match
1349 * @virq: IRQ number to get irq_data
1350 */
1351struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
1352 unsigned int virq)
1353{
1354 struct irq_data *irq_data = irq_get_irq_data(virq);
1355
1356 return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
1357}
1358EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
1359
1360/**
1361 * irq_domain_set_info - Set the complete data for a @virq in @domain
1362 * @domain: Interrupt domain to match
1363 * @virq: IRQ number
1364 * @hwirq: The hardware interrupt number
1365 * @chip: The associated interrupt chip
1366 * @chip_data: The associated interrupt chip data
1367 * @handler: The interrupt flow handler
1368 * @handler_data: The interrupt flow handler data
1369 * @handler_name: The interrupt handler name
1370 */
1371void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
1372 irq_hw_number_t hwirq, struct irq_chip *chip,
1373 void *chip_data, irq_flow_handler_t handler,
1374 void *handler_data, const char *handler_name)
1375{
1376 irq_set_chip_and_handler_name(virq, chip, handler, handler_name);
1377 irq_set_chip_data(virq, chip_data);
1378 irq_set_handler_data(virq, handler_data);
1379}
1380
1381static void irq_domain_check_hierarchy(struct irq_domain *domain)
1382{
1383}
1384#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
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/seq_file.h>
14#include <linux/slab.h>
15#include <linux/smp.h>
16#include <linux/fs.h>
17
18#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
19 * ie. legacy 8259, gets irqs 1..15 */
20#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
21#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
22#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
23
24static LIST_HEAD(irq_domain_list);
25static DEFINE_MUTEX(irq_domain_mutex);
26
27static DEFINE_MUTEX(revmap_trees_mutex);
28static struct irq_domain *irq_default_domain;
29
30/**
31 * irq_domain_alloc() - Allocate a new irq_domain data structure
32 * @of_node: optional device-tree node of the interrupt controller
33 * @revmap_type: type of reverse mapping to use
34 * @ops: map/unmap domain callbacks
35 * @host_data: Controller private data pointer
36 *
37 * Allocates and initialize and irq_domain structure. Caller is expected to
38 * register allocated irq_domain with irq_domain_register(). Returns pointer
39 * to IRQ domain, or NULL on failure.
40 */
41static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
42 unsigned int revmap_type,
43 const struct irq_domain_ops *ops,
44 void *host_data)
45{
46 struct irq_domain *domain;
47
48 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
49 if (WARN_ON(!domain))
50 return NULL;
51
52 /* Fill structure */
53 domain->revmap_type = revmap_type;
54 domain->ops = ops;
55 domain->host_data = host_data;
56 domain->of_node = of_node_get(of_node);
57
58 return domain;
59}
60
61static void irq_domain_free(struct irq_domain *domain)
62{
63 of_node_put(domain->of_node);
64 kfree(domain);
65}
66
67static void irq_domain_add(struct irq_domain *domain)
68{
69 mutex_lock(&irq_domain_mutex);
70 list_add(&domain->link, &irq_domain_list);
71 mutex_unlock(&irq_domain_mutex);
72 pr_debug("Allocated domain of type %d @0x%p\n",
73 domain->revmap_type, domain);
74}
75
76/**
77 * irq_domain_remove() - Remove an irq domain.
78 * @domain: domain to remove
79 *
80 * This routine is used to remove an irq domain. The caller must ensure
81 * that all mappings within the domain have been disposed of prior to
82 * use, depending on the revmap type.
83 */
84void irq_domain_remove(struct irq_domain *domain)
85{
86 mutex_lock(&irq_domain_mutex);
87
88 switch (domain->revmap_type) {
89 case IRQ_DOMAIN_MAP_LEGACY:
90 /*
91 * Legacy domains don't manage their own irq_desc
92 * allocations, we expect the caller to handle irq_desc
93 * freeing on their own.
94 */
95 break;
96 case IRQ_DOMAIN_MAP_TREE:
97 /*
98 * radix_tree_delete() takes care of destroying the root
99 * node when all entries are removed. Shout if there are
100 * any mappings left.
101 */
102 WARN_ON(domain->revmap_data.tree.height);
103 break;
104 case IRQ_DOMAIN_MAP_LINEAR:
105 kfree(domain->revmap_data.linear.revmap);
106 domain->revmap_data.linear.size = 0;
107 break;
108 case IRQ_DOMAIN_MAP_NOMAP:
109 break;
110 }
111
112 list_del(&domain->link);
113
114 /*
115 * If the going away domain is the default one, reset it.
116 */
117 if (unlikely(irq_default_domain == domain))
118 irq_set_default_host(NULL);
119
120 mutex_unlock(&irq_domain_mutex);
121
122 pr_debug("Removed domain of type %d @0x%p\n",
123 domain->revmap_type, domain);
124
125 irq_domain_free(domain);
126}
127EXPORT_SYMBOL_GPL(irq_domain_remove);
128
129static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
130 irq_hw_number_t hwirq)
131{
132 irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
133 int size = domain->revmap_data.legacy.size;
134
135 if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
136 return 0;
137 return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
138}
139
140/**
141 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
142 * @of_node: pointer to interrupt controller's device tree node.
143 * @size: total number of irqs in legacy mapping
144 * @first_irq: first number of irq block assigned to the domain
145 * @first_hwirq: first hwirq number to use for the translation. Should normally
146 * be '0', but a positive integer can be used if the effective
147 * hwirqs numbering does not begin at zero.
148 * @ops: map/unmap domain callbacks
149 * @host_data: Controller private data pointer
150 *
151 * Note: the map() callback will be called before this function returns
152 * for all legacy interrupts except 0 (which is always the invalid irq for
153 * a legacy controller).
154 */
155struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
156 unsigned int size,
157 unsigned int first_irq,
158 irq_hw_number_t first_hwirq,
159 const struct irq_domain_ops *ops,
160 void *host_data)
161{
162 struct irq_domain *domain;
163 unsigned int i;
164
165 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
166 if (!domain)
167 return NULL;
168
169 domain->revmap_data.legacy.first_irq = first_irq;
170 domain->revmap_data.legacy.first_hwirq = first_hwirq;
171 domain->revmap_data.legacy.size = size;
172
173 mutex_lock(&irq_domain_mutex);
174 /* Verify that all the irqs are available */
175 for (i = 0; i < size; i++) {
176 int irq = first_irq + i;
177 struct irq_data *irq_data = irq_get_irq_data(irq);
178
179 if (WARN_ON(!irq_data || irq_data->domain)) {
180 mutex_unlock(&irq_domain_mutex);
181 irq_domain_free(domain);
182 return NULL;
183 }
184 }
185
186 /* Claim all of the irqs before registering a legacy domain */
187 for (i = 0; i < size; i++) {
188 struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
189 irq_data->hwirq = first_hwirq + i;
190 irq_data->domain = domain;
191 }
192 mutex_unlock(&irq_domain_mutex);
193
194 for (i = 0; i < size; i++) {
195 int irq = first_irq + i;
196 int hwirq = first_hwirq + i;
197
198 /* IRQ0 gets ignored */
199 if (!irq)
200 continue;
201
202 /* Legacy flags are left to default at this point,
203 * one can then use irq_create_mapping() to
204 * explicitly change them
205 */
206 ops->map(domain, irq, hwirq);
207
208 /* Clear norequest flags */
209 irq_clear_status_flags(irq, IRQ_NOREQUEST);
210 }
211
212 irq_domain_add(domain);
213 return domain;
214}
215EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
216
217/**
218 * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain.
219 * @of_node: pointer to interrupt controller's device tree node.
220 * @size: Number of interrupts in the domain.
221 * @ops: map/unmap domain callbacks
222 * @host_data: Controller private data pointer
223 */
224struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
225 unsigned int size,
226 const struct irq_domain_ops *ops,
227 void *host_data)
228{
229 struct irq_domain *domain;
230 unsigned int *revmap;
231
232 revmap = kzalloc(sizeof(*revmap) * size, GFP_KERNEL);
233 if (WARN_ON(!revmap))
234 return NULL;
235
236 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
237 if (!domain) {
238 kfree(revmap);
239 return NULL;
240 }
241 domain->revmap_data.linear.size = size;
242 domain->revmap_data.linear.revmap = revmap;
243 irq_domain_add(domain);
244 return domain;
245}
246EXPORT_SYMBOL_GPL(irq_domain_add_linear);
247
248struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
249 unsigned int max_irq,
250 const struct irq_domain_ops *ops,
251 void *host_data)
252{
253 struct irq_domain *domain = irq_domain_alloc(of_node,
254 IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
255 if (domain) {
256 domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
257 irq_domain_add(domain);
258 }
259 return domain;
260}
261EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
262
263/**
264 * irq_domain_add_tree()
265 * @of_node: pointer to interrupt controller's device tree node.
266 * @ops: map/unmap domain callbacks
267 *
268 * Note: The radix tree will be allocated later during boot automatically
269 * (the reverse mapping will use the slow path until that happens).
270 */
271struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
272 const struct irq_domain_ops *ops,
273 void *host_data)
274{
275 struct irq_domain *domain = irq_domain_alloc(of_node,
276 IRQ_DOMAIN_MAP_TREE, ops, host_data);
277 if (domain) {
278 INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
279 irq_domain_add(domain);
280 }
281 return domain;
282}
283EXPORT_SYMBOL_GPL(irq_domain_add_tree);
284
285/**
286 * irq_find_host() - Locates a domain for a given device node
287 * @node: device-tree node of the interrupt controller
288 */
289struct irq_domain *irq_find_host(struct device_node *node)
290{
291 struct irq_domain *h, *found = NULL;
292 int rc;
293
294 /* We might want to match the legacy controller last since
295 * it might potentially be set to match all interrupts in
296 * the absence of a device node. This isn't a problem so far
297 * yet though...
298 */
299 mutex_lock(&irq_domain_mutex);
300 list_for_each_entry(h, &irq_domain_list, link) {
301 if (h->ops->match)
302 rc = h->ops->match(h, node);
303 else
304 rc = (h->of_node != NULL) && (h->of_node == node);
305
306 if (rc) {
307 found = h;
308 break;
309 }
310 }
311 mutex_unlock(&irq_domain_mutex);
312 return found;
313}
314EXPORT_SYMBOL_GPL(irq_find_host);
315
316/**
317 * irq_set_default_host() - Set a "default" irq domain
318 * @domain: default domain pointer
319 *
320 * For convenience, it's possible to set a "default" domain that will be used
321 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
322 * platforms that want to manipulate a few hard coded interrupt numbers that
323 * aren't properly represented in the device-tree.
324 */
325void irq_set_default_host(struct irq_domain *domain)
326{
327 pr_debug("Default domain set to @0x%p\n", domain);
328
329 irq_default_domain = domain;
330}
331EXPORT_SYMBOL_GPL(irq_set_default_host);
332
333static int irq_setup_virq(struct irq_domain *domain, unsigned int virq,
334 irq_hw_number_t hwirq)
335{
336 struct irq_data *irq_data = irq_get_irq_data(virq);
337
338 irq_data->hwirq = hwirq;
339 irq_data->domain = domain;
340 if (domain->ops->map(domain, virq, hwirq)) {
341 pr_debug("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq);
342 irq_data->domain = NULL;
343 irq_data->hwirq = 0;
344 return -1;
345 }
346
347 irq_clear_status_flags(virq, IRQ_NOREQUEST);
348
349 return 0;
350}
351
352/**
353 * irq_create_direct_mapping() - Allocate an irq for direct mapping
354 * @domain: domain to allocate the irq for or NULL for default domain
355 *
356 * This routine is used for irq controllers which can choose the hardware
357 * interrupt numbers they generate. In such a case it's simplest to use
358 * the linux irq as the hardware interrupt number.
359 */
360unsigned int irq_create_direct_mapping(struct irq_domain *domain)
361{
362 unsigned int virq;
363
364 if (domain == NULL)
365 domain = irq_default_domain;
366
367 BUG_ON(domain == NULL);
368 WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP);
369
370 virq = irq_alloc_desc_from(1, 0);
371 if (!virq) {
372 pr_debug("create_direct virq allocation failed\n");
373 return 0;
374 }
375 if (virq >= domain->revmap_data.nomap.max_irq) {
376 pr_err("ERROR: no free irqs available below %i maximum\n",
377 domain->revmap_data.nomap.max_irq);
378 irq_free_desc(virq);
379 return 0;
380 }
381 pr_debug("create_direct obtained virq %d\n", virq);
382
383 if (irq_setup_virq(domain, virq, virq)) {
384 irq_free_desc(virq);
385 return 0;
386 }
387
388 return virq;
389}
390EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
391
392/**
393 * irq_create_mapping() - Map a hardware interrupt into linux irq space
394 * @domain: domain owning this hardware interrupt or NULL for default domain
395 * @hwirq: hardware irq number in that domain space
396 *
397 * Only one mapping per hardware interrupt is permitted. Returns a linux
398 * irq number.
399 * If the sense/trigger is to be specified, set_irq_type() should be called
400 * on the number returned from that call.
401 */
402unsigned int irq_create_mapping(struct irq_domain *domain,
403 irq_hw_number_t hwirq)
404{
405 unsigned int hint;
406 int virq;
407
408 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
409
410 /* Look for default domain if nececssary */
411 if (domain == NULL)
412 domain = irq_default_domain;
413 if (domain == NULL) {
414 pr_warning("irq_create_mapping called for"
415 " NULL domain, hwirq=%lx\n", hwirq);
416 WARN_ON(1);
417 return 0;
418 }
419 pr_debug("-> using domain @%p\n", domain);
420
421 /* Check if mapping already exists */
422 virq = irq_find_mapping(domain, hwirq);
423 if (virq) {
424 pr_debug("-> existing mapping on virq %d\n", virq);
425 return virq;
426 }
427
428 /* Get a virtual interrupt number */
429 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
430 return irq_domain_legacy_revmap(domain, hwirq);
431
432 /* Allocate a virtual interrupt number */
433 hint = hwirq % nr_irqs;
434 if (hint == 0)
435 hint++;
436 virq = irq_alloc_desc_from(hint, 0);
437 if (virq <= 0)
438 virq = irq_alloc_desc_from(1, 0);
439 if (virq <= 0) {
440 pr_debug("-> virq allocation failed\n");
441 return 0;
442 }
443
444 if (irq_setup_virq(domain, virq, hwirq)) {
445 if (domain->revmap_type != IRQ_DOMAIN_MAP_LEGACY)
446 irq_free_desc(virq);
447 return 0;
448 }
449
450 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
451 hwirq, domain->of_node ? domain->of_node->full_name : "null", virq);
452
453 return virq;
454}
455EXPORT_SYMBOL_GPL(irq_create_mapping);
456
457unsigned int irq_create_of_mapping(struct device_node *controller,
458 const u32 *intspec, unsigned int intsize)
459{
460 struct irq_domain *domain;
461 irq_hw_number_t hwirq;
462 unsigned int type = IRQ_TYPE_NONE;
463 unsigned int virq;
464
465 domain = controller ? irq_find_host(controller) : irq_default_domain;
466 if (!domain) {
467#ifdef CONFIG_MIPS
468 /*
469 * Workaround to avoid breaking interrupt controller drivers
470 * that don't yet register an irq_domain. This is temporary
471 * code. ~~~gcl, Feb 24, 2012
472 *
473 * Scheduled for removal in Linux v3.6. That should be enough
474 * time.
475 */
476 if (intsize > 0)
477 return intspec[0];
478#endif
479 pr_warning("no irq domain found for %s !\n",
480 controller->full_name);
481 return 0;
482 }
483
484 /* If domain has no translation, then we assume interrupt line */
485 if (domain->ops->xlate == NULL)
486 hwirq = intspec[0];
487 else {
488 if (domain->ops->xlate(domain, controller, intspec, intsize,
489 &hwirq, &type))
490 return 0;
491 }
492
493 /* Create mapping */
494 virq = irq_create_mapping(domain, hwirq);
495 if (!virq)
496 return virq;
497
498 /* Set type if specified and different than the current one */
499 if (type != IRQ_TYPE_NONE &&
500 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
501 irq_set_irq_type(virq, type);
502 return virq;
503}
504EXPORT_SYMBOL_GPL(irq_create_of_mapping);
505
506/**
507 * irq_dispose_mapping() - Unmap an interrupt
508 * @virq: linux irq number of the interrupt to unmap
509 */
510void irq_dispose_mapping(unsigned int virq)
511{
512 struct irq_data *irq_data = irq_get_irq_data(virq);
513 struct irq_domain *domain;
514 irq_hw_number_t hwirq;
515
516 if (!virq || !irq_data)
517 return;
518
519 domain = irq_data->domain;
520 if (WARN_ON(domain == NULL))
521 return;
522
523 /* Never unmap legacy interrupts */
524 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
525 return;
526
527 irq_set_status_flags(virq, IRQ_NOREQUEST);
528
529 /* remove chip and handler */
530 irq_set_chip_and_handler(virq, NULL, NULL);
531
532 /* Make sure it's completed */
533 synchronize_irq(virq);
534
535 /* Tell the PIC about it */
536 if (domain->ops->unmap)
537 domain->ops->unmap(domain, virq);
538 smp_mb();
539
540 /* Clear reverse map */
541 hwirq = irq_data->hwirq;
542 switch(domain->revmap_type) {
543 case IRQ_DOMAIN_MAP_LINEAR:
544 if (hwirq < domain->revmap_data.linear.size)
545 domain->revmap_data.linear.revmap[hwirq] = 0;
546 break;
547 case IRQ_DOMAIN_MAP_TREE:
548 mutex_lock(&revmap_trees_mutex);
549 radix_tree_delete(&domain->revmap_data.tree, hwirq);
550 mutex_unlock(&revmap_trees_mutex);
551 break;
552 }
553
554 irq_free_desc(virq);
555}
556EXPORT_SYMBOL_GPL(irq_dispose_mapping);
557
558/**
559 * irq_find_mapping() - Find a linux irq from an hw irq number.
560 * @domain: domain owning this hardware interrupt
561 * @hwirq: hardware irq number in that domain space
562 *
563 * This is a slow path, for use by generic code. It's expected that an
564 * irq controller implementation directly calls the appropriate low level
565 * mapping function.
566 */
567unsigned int irq_find_mapping(struct irq_domain *domain,
568 irq_hw_number_t hwirq)
569{
570 unsigned int i;
571 unsigned int hint = hwirq % nr_irqs;
572
573 /* Look for default domain if nececssary */
574 if (domain == NULL)
575 domain = irq_default_domain;
576 if (domain == NULL)
577 return 0;
578
579 /* legacy -> bail early */
580 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
581 return irq_domain_legacy_revmap(domain, hwirq);
582
583 /* Slow path does a linear search of the map */
584 if (hint == 0)
585 hint = 1;
586 i = hint;
587 do {
588 struct irq_data *data = irq_get_irq_data(i);
589 if (data && (data->domain == domain) && (data->hwirq == hwirq))
590 return i;
591 i++;
592 if (i >= nr_irqs)
593 i = 1;
594 } while(i != hint);
595 return 0;
596}
597EXPORT_SYMBOL_GPL(irq_find_mapping);
598
599/**
600 * irq_radix_revmap_lookup() - Find a linux irq from a hw irq number.
601 * @domain: domain owning this hardware interrupt
602 * @hwirq: hardware irq number in that domain space
603 *
604 * This is a fast path, for use by irq controller code that uses radix tree
605 * revmaps
606 */
607unsigned int irq_radix_revmap_lookup(struct irq_domain *domain,
608 irq_hw_number_t hwirq)
609{
610 struct irq_data *irq_data;
611
612 if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
613 return irq_find_mapping(domain, hwirq);
614
615 /*
616 * Freeing an irq can delete nodes along the path to
617 * do the lookup via call_rcu.
618 */
619 rcu_read_lock();
620 irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
621 rcu_read_unlock();
622
623 /*
624 * If found in radix tree, then fine.
625 * Else fallback to linear lookup - this should not happen in practice
626 * as it means that we failed to insert the node in the radix tree.
627 */
628 return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq);
629}
630EXPORT_SYMBOL_GPL(irq_radix_revmap_lookup);
631
632/**
633 * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping.
634 * @domain: domain owning this hardware interrupt
635 * @virq: linux irq number
636 * @hwirq: hardware irq number in that domain space
637 *
638 * This is for use by irq controllers that use a radix tree reverse
639 * mapping for fast lookup.
640 */
641void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq,
642 irq_hw_number_t hwirq)
643{
644 struct irq_data *irq_data = irq_get_irq_data(virq);
645
646 if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
647 return;
648
649 if (virq) {
650 mutex_lock(&revmap_trees_mutex);
651 radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
652 mutex_unlock(&revmap_trees_mutex);
653 }
654}
655EXPORT_SYMBOL_GPL(irq_radix_revmap_insert);
656
657/**
658 * irq_linear_revmap() - Find a linux irq from a hw irq number.
659 * @domain: domain owning this hardware interrupt
660 * @hwirq: hardware irq number in that domain space
661 *
662 * This is a fast path, for use by irq controller code that uses linear
663 * revmaps. It does fallback to the slow path if the revmap doesn't exist
664 * yet and will create the revmap entry with appropriate locking
665 */
666unsigned int irq_linear_revmap(struct irq_domain *domain,
667 irq_hw_number_t hwirq)
668{
669 unsigned int *revmap;
670
671 if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR))
672 return irq_find_mapping(domain, hwirq);
673
674 /* Check revmap bounds */
675 if (unlikely(hwirq >= domain->revmap_data.linear.size))
676 return irq_find_mapping(domain, hwirq);
677
678 /* Check if revmap was allocated */
679 revmap = domain->revmap_data.linear.revmap;
680 if (unlikely(revmap == NULL))
681 return irq_find_mapping(domain, hwirq);
682
683 /* Fill up revmap with slow path if no mapping found */
684 if (unlikely(!revmap[hwirq]))
685 revmap[hwirq] = irq_find_mapping(domain, hwirq);
686
687 return revmap[hwirq];
688}
689EXPORT_SYMBOL_GPL(irq_linear_revmap);
690
691#ifdef CONFIG_IRQ_DOMAIN_DEBUG
692static int virq_debug_show(struct seq_file *m, void *private)
693{
694 unsigned long flags;
695 struct irq_desc *desc;
696 const char *p;
697 static const char none[] = "none";
698 void *data;
699 int i;
700
701 seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq",
702 "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
703 "domain name");
704
705 for (i = 1; i < nr_irqs; i++) {
706 desc = irq_to_desc(i);
707 if (!desc)
708 continue;
709
710 raw_spin_lock_irqsave(&desc->lock, flags);
711
712 if (desc->action && desc->action->handler) {
713 struct irq_chip *chip;
714
715 seq_printf(m, "%5d ", i);
716 seq_printf(m, "0x%05lx ", desc->irq_data.hwirq);
717
718 chip = irq_desc_get_chip(desc);
719 if (chip && chip->name)
720 p = chip->name;
721 else
722 p = none;
723 seq_printf(m, "%-15s ", p);
724
725 data = irq_desc_get_chip_data(desc);
726 seq_printf(m, data ? "0x%p " : " %p ", data);
727
728 if (desc->irq_data.domain && desc->irq_data.domain->of_node)
729 p = desc->irq_data.domain->of_node->full_name;
730 else
731 p = none;
732 seq_printf(m, "%s\n", p);
733 }
734
735 raw_spin_unlock_irqrestore(&desc->lock, flags);
736 }
737
738 return 0;
739}
740
741static int virq_debug_open(struct inode *inode, struct file *file)
742{
743 return single_open(file, virq_debug_show, inode->i_private);
744}
745
746static const struct file_operations virq_debug_fops = {
747 .open = virq_debug_open,
748 .read = seq_read,
749 .llseek = seq_lseek,
750 .release = single_release,
751};
752
753static int __init irq_debugfs_init(void)
754{
755 if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
756 NULL, &virq_debug_fops) == NULL)
757 return -ENOMEM;
758
759 return 0;
760}
761__initcall(irq_debugfs_init);
762#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
763
764static int irq_domain_simple_map(struct irq_domain *d, unsigned int irq,
765 irq_hw_number_t hwirq)
766{
767 return 0;
768}
769
770/**
771 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
772 *
773 * Device Tree IRQ specifier translation function which works with one cell
774 * bindings where the cell value maps directly to the hwirq number.
775 */
776int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
777 const u32 *intspec, unsigned int intsize,
778 unsigned long *out_hwirq, unsigned int *out_type)
779{
780 if (WARN_ON(intsize < 1))
781 return -EINVAL;
782 *out_hwirq = intspec[0];
783 *out_type = IRQ_TYPE_NONE;
784 return 0;
785}
786EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
787
788/**
789 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
790 *
791 * Device Tree IRQ specifier translation function which works with two cell
792 * bindings where the cell values map directly to the hwirq number
793 * and linux irq flags.
794 */
795int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
796 const u32 *intspec, unsigned int intsize,
797 irq_hw_number_t *out_hwirq, unsigned int *out_type)
798{
799 if (WARN_ON(intsize < 2))
800 return -EINVAL;
801 *out_hwirq = intspec[0];
802 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
803 return 0;
804}
805EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
806
807/**
808 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
809 *
810 * Device Tree IRQ specifier translation function which works with either one
811 * or two cell bindings where the cell values map directly to the hwirq number
812 * and linux irq flags.
813 *
814 * Note: don't use this function unless your interrupt controller explicitly
815 * supports both one and two cell bindings. For the majority of controllers
816 * the _onecell() or _twocell() variants above should be used.
817 */
818int irq_domain_xlate_onetwocell(struct irq_domain *d,
819 struct device_node *ctrlr,
820 const u32 *intspec, unsigned int intsize,
821 unsigned long *out_hwirq, unsigned int *out_type)
822{
823 if (WARN_ON(intsize < 1))
824 return -EINVAL;
825 *out_hwirq = intspec[0];
826 *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
827 return 0;
828}
829EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
830
831const struct irq_domain_ops irq_domain_simple_ops = {
832 .map = irq_domain_simple_map,
833 .xlate = irq_domain_xlate_onetwocell,
834};
835EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
836
837#ifdef CONFIG_OF_IRQ
838void irq_domain_generate_simple(const struct of_device_id *match,
839 u64 phys_base, unsigned int irq_start)
840{
841 struct device_node *node;
842 pr_debug("looking for phys_base=%llx, irq_start=%i\n",
843 (unsigned long long) phys_base, (int) irq_start);
844 node = of_find_matching_node_by_address(NULL, match, phys_base);
845 if (node)
846 irq_domain_add_legacy(node, 32, irq_start, 0,
847 &irq_domain_simple_ops, NULL);
848}
849EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
850#endif