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