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