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