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989d42e8 | 1 | // SPDX-License-Identifier: GPL-2.0 |
9ac7849e TH |
2 | /* |
3 | * drivers/base/devres.c - device resource management | |
4 | * | |
5 | * Copyright (c) 2006 SUSE Linux Products GmbH | |
6 | * Copyright (c) 2006 Tejun Heo <teheo@suse.de> | |
9ac7849e TH |
7 | */ |
8 | ||
9 | #include <linux/device.h> | |
10 | #include <linux/module.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
ff86aae3 | 12 | #include <linux/percpu.h> |
9ac7849e | 13 | |
09d1ea1c BG |
14 | #include <asm/sections.h> |
15 | ||
2a013455 AB |
16 | #include "base.h" |
17 | ||
9ac7849e TH |
18 | struct devres_node { |
19 | struct list_head entry; | |
20 | dr_release_t release; | |
21 | #ifdef CONFIG_DEBUG_DEVRES | |
22 | const char *name; | |
23 | size_t size; | |
24 | #endif | |
25 | }; | |
26 | ||
27 | struct devres { | |
28 | struct devres_node node; | |
a66d9724 AB |
29 | /* |
30 | * Some archs want to perform DMA into kmalloc caches | |
31 | * and need a guaranteed alignment larger than | |
32 | * the alignment of a 64-bit integer. | |
33 | * Thus we use ARCH_KMALLOC_MINALIGN here and get exactly the same | |
34 | * buffer alignment as if it was allocated by plain kmalloc(). | |
35 | */ | |
36 | u8 __aligned(ARCH_KMALLOC_MINALIGN) data[]; | |
9ac7849e TH |
37 | }; |
38 | ||
39 | struct devres_group { | |
40 | struct devres_node node[2]; | |
41 | void *id; | |
42 | int color; | |
43 | /* -- 8 pointers */ | |
44 | }; | |
45 | ||
46 | #ifdef CONFIG_DEBUG_DEVRES | |
47 | static int log_devres = 0; | |
48 | module_param_named(log, log_devres, int, S_IRUGO | S_IWUSR); | |
49 | ||
50 | static void set_node_dbginfo(struct devres_node *node, const char *name, | |
51 | size_t size) | |
52 | { | |
53 | node->name = name; | |
54 | node->size = size; | |
55 | } | |
56 | ||
57 | static void devres_log(struct device *dev, struct devres_node *node, | |
58 | const char *op) | |
59 | { | |
60 | if (unlikely(log_devres)) | |
a369a7eb JP |
61 | dev_err(dev, "DEVRES %3s %p %s (%lu bytes)\n", |
62 | op, node, node->name, (unsigned long)node->size); | |
9ac7849e TH |
63 | } |
64 | #else /* CONFIG_DEBUG_DEVRES */ | |
65 | #define set_node_dbginfo(node, n, s) do {} while (0) | |
66 | #define devres_log(dev, node, op) do {} while (0) | |
67 | #endif /* CONFIG_DEBUG_DEVRES */ | |
68 | ||
69 | /* | |
70 | * Release functions for devres group. These callbacks are used only | |
71 | * for identification. | |
72 | */ | |
73 | static void group_open_release(struct device *dev, void *res) | |
74 | { | |
75 | /* noop */ | |
76 | } | |
77 | ||
78 | static void group_close_release(struct device *dev, void *res) | |
79 | { | |
80 | /* noop */ | |
81 | } | |
82 | ||
83 | static struct devres_group * node_to_group(struct devres_node *node) | |
84 | { | |
85 | if (node->release == &group_open_release) | |
86 | return container_of(node, struct devres_group, node[0]); | |
87 | if (node->release == &group_close_release) | |
88 | return container_of(node, struct devres_group, node[1]); | |
89 | return NULL; | |
90 | } | |
91 | ||
92 | static __always_inline struct devres * alloc_dr(dr_release_t release, | |
7c683941 | 93 | size_t size, gfp_t gfp, int nid) |
9ac7849e | 94 | { |
2509b561 | 95 | size_t tot_size; |
9ac7849e TH |
96 | struct devres *dr; |
97 | ||
2509b561 KC |
98 | /* We must catch any near-SIZE_MAX cases that could overflow. */ |
99 | if (unlikely(check_add_overflow(sizeof(struct devres), size, | |
100 | &tot_size))) | |
101 | return NULL; | |
102 | ||
7c683941 | 103 | dr = kmalloc_node_track_caller(tot_size, gfp, nid); |
9ac7849e TH |
104 | if (unlikely(!dr)) |
105 | return NULL; | |
106 | ||
64c862a8 JP |
107 | memset(dr, 0, offsetof(struct devres, data)); |
108 | ||
9ac7849e TH |
109 | INIT_LIST_HEAD(&dr->node.entry); |
110 | dr->node.release = release; | |
111 | return dr; | |
112 | } | |
113 | ||
114 | static void add_dr(struct device *dev, struct devres_node *node) | |
115 | { | |
116 | devres_log(dev, node, "ADD"); | |
117 | BUG_ON(!list_empty(&node->entry)); | |
118 | list_add_tail(&node->entry, &dev->devres_head); | |
119 | } | |
120 | ||
9ac7849e | 121 | #ifdef CONFIG_DEBUG_DEVRES |
7c683941 | 122 | void * __devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp, int nid, |
9ac7849e TH |
123 | const char *name) |
124 | { | |
125 | struct devres *dr; | |
126 | ||
7c683941 | 127 | dr = alloc_dr(release, size, gfp | __GFP_ZERO, nid); |
9ac7849e TH |
128 | if (unlikely(!dr)) |
129 | return NULL; | |
130 | set_node_dbginfo(&dr->node, name, size); | |
131 | return dr->data; | |
132 | } | |
7c683941 | 133 | EXPORT_SYMBOL_GPL(__devres_alloc_node); |
9ac7849e | 134 | #else |
d3e6975e RD |
135 | /** |
136 | * devres_alloc - Allocate device resource data | |
137 | * @release: Release function devres will be associated with | |
138 | * @size: Allocation size | |
139 | * @gfp: Allocation flags | |
7c683941 | 140 | * @nid: NUMA node |
d3e6975e RD |
141 | * |
142 | * Allocate devres of @size bytes. The allocated area is zeroed, then | |
143 | * associated with @release. The returned pointer can be passed to | |
144 | * other devres_*() functions. | |
145 | * | |
146 | * RETURNS: | |
147 | * Pointer to allocated devres on success, NULL on failure. | |
148 | */ | |
7c683941 | 149 | void * devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp, int nid) |
9ac7849e TH |
150 | { |
151 | struct devres *dr; | |
152 | ||
7c683941 | 153 | dr = alloc_dr(release, size, gfp | __GFP_ZERO, nid); |
9ac7849e TH |
154 | if (unlikely(!dr)) |
155 | return NULL; | |
156 | return dr->data; | |
157 | } | |
7c683941 | 158 | EXPORT_SYMBOL_GPL(devres_alloc_node); |
9ac7849e TH |
159 | #endif |
160 | ||
bddb1b90 ML |
161 | /** |
162 | * devres_for_each_res - Resource iterator | |
163 | * @dev: Device to iterate resource from | |
164 | * @release: Look for resources associated with this release function | |
165 | * @match: Match function (optional) | |
166 | * @match_data: Data for the match function | |
167 | * @fn: Function to be called for each matched resource. | |
168 | * @data: Data for @fn, the 3rd parameter of @fn | |
169 | * | |
170 | * Call @fn for each devres of @dev which is associated with @release | |
171 | * and for which @match returns 1. | |
172 | * | |
173 | * RETURNS: | |
174 | * void | |
175 | */ | |
176 | void devres_for_each_res(struct device *dev, dr_release_t release, | |
177 | dr_match_t match, void *match_data, | |
178 | void (*fn)(struct device *, void *, void *), | |
179 | void *data) | |
180 | { | |
181 | struct devres_node *node; | |
182 | struct devres_node *tmp; | |
183 | unsigned long flags; | |
184 | ||
185 | if (!fn) | |
186 | return; | |
187 | ||
188 | spin_lock_irqsave(&dev->devres_lock, flags); | |
189 | list_for_each_entry_safe_reverse(node, tmp, | |
190 | &dev->devres_head, entry) { | |
191 | struct devres *dr = container_of(node, struct devres, node); | |
192 | ||
193 | if (node->release != release) | |
194 | continue; | |
195 | if (match && !match(dev, dr->data, match_data)) | |
196 | continue; | |
197 | fn(dev, dr->data, data); | |
198 | } | |
199 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
200 | } | |
201 | EXPORT_SYMBOL_GPL(devres_for_each_res); | |
202 | ||
9ac7849e TH |
203 | /** |
204 | * devres_free - Free device resource data | |
205 | * @res: Pointer to devres data to free | |
206 | * | |
207 | * Free devres created with devres_alloc(). | |
208 | */ | |
209 | void devres_free(void *res) | |
210 | { | |
211 | if (res) { | |
212 | struct devres *dr = container_of(res, struct devres, data); | |
213 | ||
214 | BUG_ON(!list_empty(&dr->node.entry)); | |
215 | kfree(dr); | |
216 | } | |
217 | } | |
218 | EXPORT_SYMBOL_GPL(devres_free); | |
219 | ||
220 | /** | |
221 | * devres_add - Register device resource | |
222 | * @dev: Device to add resource to | |
223 | * @res: Resource to register | |
224 | * | |
225 | * Register devres @res to @dev. @res should have been allocated | |
226 | * using devres_alloc(). On driver detach, the associated release | |
227 | * function will be invoked and devres will be freed automatically. | |
228 | */ | |
229 | void devres_add(struct device *dev, void *res) | |
230 | { | |
231 | struct devres *dr = container_of(res, struct devres, data); | |
232 | unsigned long flags; | |
233 | ||
234 | spin_lock_irqsave(&dev->devres_lock, flags); | |
235 | add_dr(dev, &dr->node); | |
236 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
237 | } | |
238 | EXPORT_SYMBOL_GPL(devres_add); | |
239 | ||
240 | static struct devres *find_dr(struct device *dev, dr_release_t release, | |
241 | dr_match_t match, void *match_data) | |
242 | { | |
243 | struct devres_node *node; | |
244 | ||
245 | list_for_each_entry_reverse(node, &dev->devres_head, entry) { | |
246 | struct devres *dr = container_of(node, struct devres, node); | |
247 | ||
248 | if (node->release != release) | |
249 | continue; | |
250 | if (match && !match(dev, dr->data, match_data)) | |
251 | continue; | |
252 | return dr; | |
253 | } | |
254 | ||
255 | return NULL; | |
256 | } | |
257 | ||
258 | /** | |
259 | * devres_find - Find device resource | |
260 | * @dev: Device to lookup resource from | |
261 | * @release: Look for resources associated with this release function | |
262 | * @match: Match function (optional) | |
263 | * @match_data: Data for the match function | |
264 | * | |
265 | * Find the latest devres of @dev which is associated with @release | |
266 | * and for which @match returns 1. If @match is NULL, it's considered | |
267 | * to match all. | |
268 | * | |
269 | * RETURNS: | |
270 | * Pointer to found devres, NULL if not found. | |
271 | */ | |
272 | void * devres_find(struct device *dev, dr_release_t release, | |
273 | dr_match_t match, void *match_data) | |
274 | { | |
275 | struct devres *dr; | |
276 | unsigned long flags; | |
277 | ||
278 | spin_lock_irqsave(&dev->devres_lock, flags); | |
279 | dr = find_dr(dev, release, match, match_data); | |
280 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
281 | ||
282 | if (dr) | |
283 | return dr->data; | |
284 | return NULL; | |
285 | } | |
286 | EXPORT_SYMBOL_GPL(devres_find); | |
287 | ||
288 | /** | |
289 | * devres_get - Find devres, if non-existent, add one atomically | |
290 | * @dev: Device to lookup or add devres for | |
291 | * @new_res: Pointer to new initialized devres to add if not found | |
292 | * @match: Match function (optional) | |
293 | * @match_data: Data for the match function | |
294 | * | |
295 | * Find the latest devres of @dev which has the same release function | |
296 | * as @new_res and for which @match return 1. If found, @new_res is | |
297 | * freed; otherwise, @new_res is added atomically. | |
298 | * | |
299 | * RETURNS: | |
300 | * Pointer to found or added devres. | |
301 | */ | |
302 | void * devres_get(struct device *dev, void *new_res, | |
303 | dr_match_t match, void *match_data) | |
304 | { | |
305 | struct devres *new_dr = container_of(new_res, struct devres, data); | |
306 | struct devres *dr; | |
307 | unsigned long flags; | |
308 | ||
309 | spin_lock_irqsave(&dev->devres_lock, flags); | |
310 | dr = find_dr(dev, new_dr->node.release, match, match_data); | |
311 | if (!dr) { | |
312 | add_dr(dev, &new_dr->node); | |
313 | dr = new_dr; | |
64526370 | 314 | new_res = NULL; |
9ac7849e TH |
315 | } |
316 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
64526370 | 317 | devres_free(new_res); |
9ac7849e TH |
318 | |
319 | return dr->data; | |
320 | } | |
321 | EXPORT_SYMBOL_GPL(devres_get); | |
322 | ||
323 | /** | |
324 | * devres_remove - Find a device resource and remove it | |
325 | * @dev: Device to find resource from | |
326 | * @release: Look for resources associated with this release function | |
327 | * @match: Match function (optional) | |
328 | * @match_data: Data for the match function | |
329 | * | |
330 | * Find the latest devres of @dev associated with @release and for | |
331 | * which @match returns 1. If @match is NULL, it's considered to | |
332 | * match all. If found, the resource is removed atomically and | |
333 | * returned. | |
334 | * | |
335 | * RETURNS: | |
336 | * Pointer to removed devres on success, NULL if not found. | |
337 | */ | |
338 | void * devres_remove(struct device *dev, dr_release_t release, | |
339 | dr_match_t match, void *match_data) | |
340 | { | |
341 | struct devres *dr; | |
342 | unsigned long flags; | |
343 | ||
344 | spin_lock_irqsave(&dev->devres_lock, flags); | |
345 | dr = find_dr(dev, release, match, match_data); | |
346 | if (dr) { | |
347 | list_del_init(&dr->node.entry); | |
348 | devres_log(dev, &dr->node, "REM"); | |
349 | } | |
350 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
351 | ||
352 | if (dr) | |
353 | return dr->data; | |
354 | return NULL; | |
355 | } | |
356 | EXPORT_SYMBOL_GPL(devres_remove); | |
357 | ||
358 | /** | |
359 | * devres_destroy - Find a device resource and destroy it | |
360 | * @dev: Device to find resource from | |
361 | * @release: Look for resources associated with this release function | |
362 | * @match: Match function (optional) | |
363 | * @match_data: Data for the match function | |
364 | * | |
365 | * Find the latest devres of @dev associated with @release and for | |
366 | * which @match returns 1. If @match is NULL, it's considered to | |
367 | * match all. If found, the resource is removed atomically and freed. | |
368 | * | |
698cd2dd MB |
369 | * Note that the release function for the resource will not be called, |
370 | * only the devres-allocated data will be freed. The caller becomes | |
371 | * responsible for freeing any other data. | |
372 | * | |
9ac7849e TH |
373 | * RETURNS: |
374 | * 0 if devres is found and freed, -ENOENT if not found. | |
375 | */ | |
376 | int devres_destroy(struct device *dev, dr_release_t release, | |
377 | dr_match_t match, void *match_data) | |
378 | { | |
379 | void *res; | |
380 | ||
381 | res = devres_remove(dev, release, match, match_data); | |
382 | if (unlikely(!res)) | |
383 | return -ENOENT; | |
384 | ||
385 | devres_free(res); | |
386 | return 0; | |
387 | } | |
388 | EXPORT_SYMBOL_GPL(devres_destroy); | |
389 | ||
d926d0e4 MB |
390 | |
391 | /** | |
392 | * devres_release - Find a device resource and destroy it, calling release | |
393 | * @dev: Device to find resource from | |
394 | * @release: Look for resources associated with this release function | |
395 | * @match: Match function (optional) | |
396 | * @match_data: Data for the match function | |
397 | * | |
398 | * Find the latest devres of @dev associated with @release and for | |
399 | * which @match returns 1. If @match is NULL, it's considered to | |
400 | * match all. If found, the resource is removed atomically, the | |
401 | * release function called and the resource freed. | |
402 | * | |
403 | * RETURNS: | |
404 | * 0 if devres is found and freed, -ENOENT if not found. | |
405 | */ | |
406 | int devres_release(struct device *dev, dr_release_t release, | |
407 | dr_match_t match, void *match_data) | |
408 | { | |
409 | void *res; | |
410 | ||
411 | res = devres_remove(dev, release, match, match_data); | |
412 | if (unlikely(!res)) | |
413 | return -ENOENT; | |
414 | ||
415 | (*release)(dev, res); | |
416 | devres_free(res); | |
417 | return 0; | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(devres_release); | |
420 | ||
9ac7849e TH |
421 | static int remove_nodes(struct device *dev, |
422 | struct list_head *first, struct list_head *end, | |
423 | struct list_head *todo) | |
424 | { | |
425 | int cnt = 0, nr_groups = 0; | |
426 | struct list_head *cur; | |
427 | ||
428 | /* First pass - move normal devres entries to @todo and clear | |
429 | * devres_group colors. | |
430 | */ | |
431 | cur = first; | |
432 | while (cur != end) { | |
433 | struct devres_node *node; | |
434 | struct devres_group *grp; | |
435 | ||
436 | node = list_entry(cur, struct devres_node, entry); | |
437 | cur = cur->next; | |
438 | ||
439 | grp = node_to_group(node); | |
440 | if (grp) { | |
441 | /* clear color of group markers in the first pass */ | |
442 | grp->color = 0; | |
443 | nr_groups++; | |
444 | } else { | |
445 | /* regular devres entry */ | |
446 | if (&node->entry == first) | |
447 | first = first->next; | |
448 | list_move_tail(&node->entry, todo); | |
449 | cnt++; | |
450 | } | |
451 | } | |
452 | ||
453 | if (!nr_groups) | |
454 | return cnt; | |
455 | ||
456 | /* Second pass - Scan groups and color them. A group gets | |
457 | * color value of two iff the group is wholly contained in | |
458 | * [cur, end). That is, for a closed group, both opening and | |
459 | * closing markers should be in the range, while just the | |
460 | * opening marker is enough for an open group. | |
461 | */ | |
462 | cur = first; | |
463 | while (cur != end) { | |
464 | struct devres_node *node; | |
465 | struct devres_group *grp; | |
466 | ||
467 | node = list_entry(cur, struct devres_node, entry); | |
468 | cur = cur->next; | |
469 | ||
470 | grp = node_to_group(node); | |
471 | BUG_ON(!grp || list_empty(&grp->node[0].entry)); | |
472 | ||
473 | grp->color++; | |
474 | if (list_empty(&grp->node[1].entry)) | |
475 | grp->color++; | |
476 | ||
477 | BUG_ON(grp->color <= 0 || grp->color > 2); | |
478 | if (grp->color == 2) { | |
479 | /* No need to update cur or end. The removed | |
480 | * nodes are always before both. | |
481 | */ | |
482 | list_move_tail(&grp->node[0].entry, todo); | |
483 | list_del_init(&grp->node[1].entry); | |
484 | } | |
485 | } | |
486 | ||
487 | return cnt; | |
488 | } | |
489 | ||
490 | static int release_nodes(struct device *dev, struct list_head *first, | |
491 | struct list_head *end, unsigned long flags) | |
86ec67fd | 492 | __releases(&dev->devres_lock) |
9ac7849e TH |
493 | { |
494 | LIST_HEAD(todo); | |
495 | int cnt; | |
496 | struct devres *dr, *tmp; | |
497 | ||
498 | cnt = remove_nodes(dev, first, end, &todo); | |
499 | ||
500 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
501 | ||
502 | /* Release. Note that both devres and devres_group are | |
503 | * handled as devres in the following loop. This is safe. | |
504 | */ | |
505 | list_for_each_entry_safe_reverse(dr, tmp, &todo, node.entry) { | |
506 | devres_log(dev, &dr->node, "REL"); | |
507 | dr->node.release(dev, dr->data); | |
508 | kfree(dr); | |
509 | } | |
510 | ||
511 | return cnt; | |
512 | } | |
513 | ||
514 | /** | |
d3e6975e | 515 | * devres_release_all - Release all managed resources |
9ac7849e TH |
516 | * @dev: Device to release resources for |
517 | * | |
518 | * Release all resources associated with @dev. This function is | |
519 | * called on driver detach. | |
520 | */ | |
521 | int devres_release_all(struct device *dev) | |
522 | { | |
523 | unsigned long flags; | |
524 | ||
eb8d3c60 BH |
525 | /* Looks like an uninitialized device structure */ |
526 | if (WARN_ON(dev->devres_head.next == NULL)) | |
527 | return -ENODEV; | |
9ac7849e TH |
528 | spin_lock_irqsave(&dev->devres_lock, flags); |
529 | return release_nodes(dev, dev->devres_head.next, &dev->devres_head, | |
530 | flags); | |
531 | } | |
532 | ||
533 | /** | |
534 | * devres_open_group - Open a new devres group | |
535 | * @dev: Device to open devres group for | |
536 | * @id: Separator ID | |
537 | * @gfp: Allocation flags | |
538 | * | |
539 | * Open a new devres group for @dev with @id. For @id, using a | |
540 | * pointer to an object which won't be used for another group is | |
541 | * recommended. If @id is NULL, address-wise unique ID is created. | |
542 | * | |
543 | * RETURNS: | |
544 | * ID of the new group, NULL on failure. | |
545 | */ | |
546 | void * devres_open_group(struct device *dev, void *id, gfp_t gfp) | |
547 | { | |
548 | struct devres_group *grp; | |
549 | unsigned long flags; | |
550 | ||
551 | grp = kmalloc(sizeof(*grp), gfp); | |
552 | if (unlikely(!grp)) | |
553 | return NULL; | |
554 | ||
555 | grp->node[0].release = &group_open_release; | |
556 | grp->node[1].release = &group_close_release; | |
557 | INIT_LIST_HEAD(&grp->node[0].entry); | |
558 | INIT_LIST_HEAD(&grp->node[1].entry); | |
559 | set_node_dbginfo(&grp->node[0], "grp<", 0); | |
560 | set_node_dbginfo(&grp->node[1], "grp>", 0); | |
561 | grp->id = grp; | |
562 | if (id) | |
563 | grp->id = id; | |
564 | ||
565 | spin_lock_irqsave(&dev->devres_lock, flags); | |
566 | add_dr(dev, &grp->node[0]); | |
567 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
568 | return grp->id; | |
569 | } | |
570 | EXPORT_SYMBOL_GPL(devres_open_group); | |
571 | ||
572 | /* Find devres group with ID @id. If @id is NULL, look for the latest. */ | |
573 | static struct devres_group * find_group(struct device *dev, void *id) | |
574 | { | |
575 | struct devres_node *node; | |
576 | ||
577 | list_for_each_entry_reverse(node, &dev->devres_head, entry) { | |
578 | struct devres_group *grp; | |
579 | ||
580 | if (node->release != &group_open_release) | |
581 | continue; | |
582 | ||
583 | grp = container_of(node, struct devres_group, node[0]); | |
584 | ||
585 | if (id) { | |
586 | if (grp->id == id) | |
587 | return grp; | |
588 | } else if (list_empty(&grp->node[1].entry)) | |
589 | return grp; | |
590 | } | |
591 | ||
592 | return NULL; | |
593 | } | |
594 | ||
595 | /** | |
596 | * devres_close_group - Close a devres group | |
597 | * @dev: Device to close devres group for | |
598 | * @id: ID of target group, can be NULL | |
599 | * | |
600 | * Close the group identified by @id. If @id is NULL, the latest open | |
601 | * group is selected. | |
602 | */ | |
603 | void devres_close_group(struct device *dev, void *id) | |
604 | { | |
605 | struct devres_group *grp; | |
606 | unsigned long flags; | |
607 | ||
608 | spin_lock_irqsave(&dev->devres_lock, flags); | |
609 | ||
610 | grp = find_group(dev, id); | |
611 | if (grp) | |
612 | add_dr(dev, &grp->node[1]); | |
613 | else | |
614 | WARN_ON(1); | |
615 | ||
616 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
617 | } | |
618 | EXPORT_SYMBOL_GPL(devres_close_group); | |
619 | ||
620 | /** | |
621 | * devres_remove_group - Remove a devres group | |
622 | * @dev: Device to remove group for | |
623 | * @id: ID of target group, can be NULL | |
624 | * | |
625 | * Remove the group identified by @id. If @id is NULL, the latest | |
626 | * open group is selected. Note that removing a group doesn't affect | |
627 | * any other resources. | |
628 | */ | |
629 | void devres_remove_group(struct device *dev, void *id) | |
630 | { | |
631 | struct devres_group *grp; | |
632 | unsigned long flags; | |
633 | ||
634 | spin_lock_irqsave(&dev->devres_lock, flags); | |
635 | ||
636 | grp = find_group(dev, id); | |
637 | if (grp) { | |
638 | list_del_init(&grp->node[0].entry); | |
639 | list_del_init(&grp->node[1].entry); | |
640 | devres_log(dev, &grp->node[0], "REM"); | |
641 | } else | |
642 | WARN_ON(1); | |
643 | ||
644 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
645 | ||
646 | kfree(grp); | |
647 | } | |
648 | EXPORT_SYMBOL_GPL(devres_remove_group); | |
649 | ||
650 | /** | |
651 | * devres_release_group - Release resources in a devres group | |
652 | * @dev: Device to release group for | |
653 | * @id: ID of target group, can be NULL | |
654 | * | |
655 | * Release all resources in the group identified by @id. If @id is | |
656 | * NULL, the latest open group is selected. The selected group and | |
657 | * groups properly nested inside the selected group are removed. | |
658 | * | |
659 | * RETURNS: | |
660 | * The number of released non-group resources. | |
661 | */ | |
662 | int devres_release_group(struct device *dev, void *id) | |
663 | { | |
664 | struct devres_group *grp; | |
665 | unsigned long flags; | |
666 | int cnt = 0; | |
667 | ||
668 | spin_lock_irqsave(&dev->devres_lock, flags); | |
669 | ||
670 | grp = find_group(dev, id); | |
671 | if (grp) { | |
672 | struct list_head *first = &grp->node[0].entry; | |
673 | struct list_head *end = &dev->devres_head; | |
674 | ||
675 | if (!list_empty(&grp->node[1].entry)) | |
676 | end = grp->node[1].entry.next; | |
677 | ||
678 | cnt = release_nodes(dev, first, end, flags); | |
679 | } else { | |
680 | WARN_ON(1); | |
681 | spin_unlock_irqrestore(&dev->devres_lock, flags); | |
682 | } | |
683 | ||
684 | return cnt; | |
685 | } | |
686 | EXPORT_SYMBOL_GPL(devres_release_group); | |
687 | ||
d6b0c580 DT |
688 | /* |
689 | * Custom devres actions allow inserting a simple function call | |
690 | * into the teadown sequence. | |
691 | */ | |
692 | ||
693 | struct action_devres { | |
694 | void *data; | |
695 | void (*action)(void *); | |
696 | }; | |
697 | ||
698 | static int devm_action_match(struct device *dev, void *res, void *p) | |
699 | { | |
700 | struct action_devres *devres = res; | |
701 | struct action_devres *target = p; | |
702 | ||
703 | return devres->action == target->action && | |
704 | devres->data == target->data; | |
705 | } | |
706 | ||
707 | static void devm_action_release(struct device *dev, void *res) | |
708 | { | |
709 | struct action_devres *devres = res; | |
710 | ||
711 | devres->action(devres->data); | |
712 | } | |
713 | ||
714 | /** | |
715 | * devm_add_action() - add a custom action to list of managed resources | |
716 | * @dev: Device that owns the action | |
717 | * @action: Function that should be called | |
718 | * @data: Pointer to data passed to @action implementation | |
719 | * | |
720 | * This adds a custom action to the list of managed resources so that | |
721 | * it gets executed as part of standard resource unwinding. | |
722 | */ | |
723 | int devm_add_action(struct device *dev, void (*action)(void *), void *data) | |
724 | { | |
725 | struct action_devres *devres; | |
726 | ||
727 | devres = devres_alloc(devm_action_release, | |
728 | sizeof(struct action_devres), GFP_KERNEL); | |
729 | if (!devres) | |
730 | return -ENOMEM; | |
731 | ||
732 | devres->data = data; | |
733 | devres->action = action; | |
734 | ||
735 | devres_add(dev, devres); | |
736 | return 0; | |
737 | } | |
738 | EXPORT_SYMBOL_GPL(devm_add_action); | |
739 | ||
740 | /** | |
741 | * devm_remove_action() - removes previously added custom action | |
742 | * @dev: Device that owns the action | |
743 | * @action: Function implementing the action | |
744 | * @data: Pointer to data passed to @action implementation | |
745 | * | |
746 | * Removes instance of @action previously added by devm_add_action(). | |
747 | * Both action and data should match one of the existing entries. | |
748 | */ | |
749 | void devm_remove_action(struct device *dev, void (*action)(void *), void *data) | |
750 | { | |
751 | struct action_devres devres = { | |
752 | .data = data, | |
753 | .action = action, | |
754 | }; | |
755 | ||
756 | WARN_ON(devres_destroy(dev, devm_action_release, devm_action_match, | |
757 | &devres)); | |
758 | ||
759 | } | |
760 | EXPORT_SYMBOL_GPL(devm_remove_action); | |
761 | ||
9ac7849e | 762 | /* |
64c862a8 | 763 | * Managed kmalloc/kfree |
9ac7849e | 764 | */ |
64c862a8 | 765 | static void devm_kmalloc_release(struct device *dev, void *res) |
9ac7849e TH |
766 | { |
767 | /* noop */ | |
768 | } | |
769 | ||
64c862a8 | 770 | static int devm_kmalloc_match(struct device *dev, void *res, void *data) |
9ac7849e TH |
771 | { |
772 | return res == data; | |
773 | } | |
774 | ||
775 | /** | |
64c862a8 | 776 | * devm_kmalloc - Resource-managed kmalloc |
9ac7849e TH |
777 | * @dev: Device to allocate memory for |
778 | * @size: Allocation size | |
779 | * @gfp: Allocation gfp flags | |
780 | * | |
64c862a8 | 781 | * Managed kmalloc. Memory allocated with this function is |
9ac7849e TH |
782 | * automatically freed on driver detach. Like all other devres |
783 | * resources, guaranteed alignment is unsigned long long. | |
784 | * | |
785 | * RETURNS: | |
786 | * Pointer to allocated memory on success, NULL on failure. | |
787 | */ | |
64c862a8 | 788 | void * devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) |
9ac7849e TH |
789 | { |
790 | struct devres *dr; | |
791 | ||
792 | /* use raw alloc_dr for kmalloc caller tracing */ | |
7c683941 | 793 | dr = alloc_dr(devm_kmalloc_release, size, gfp, dev_to_node(dev)); |
9ac7849e TH |
794 | if (unlikely(!dr)) |
795 | return NULL; | |
796 | ||
64c862a8 JP |
797 | /* |
798 | * This is named devm_kzalloc_release for historical reasons | |
799 | * The initial implementation did not support kmalloc, only kzalloc | |
800 | */ | |
9ac7849e TH |
801 | set_node_dbginfo(&dr->node, "devm_kzalloc_release", size); |
802 | devres_add(dev, dr->data); | |
803 | return dr->data; | |
804 | } | |
64c862a8 | 805 | EXPORT_SYMBOL_GPL(devm_kmalloc); |
9ac7849e | 806 | |
e31108ca MB |
807 | /** |
808 | * devm_kstrdup - Allocate resource managed space and | |
809 | * copy an existing string into that. | |
810 | * @dev: Device to allocate memory for | |
811 | * @s: the string to duplicate | |
812 | * @gfp: the GFP mask used in the devm_kmalloc() call when | |
813 | * allocating memory | |
814 | * RETURNS: | |
815 | * Pointer to allocated string on success, NULL on failure. | |
816 | */ | |
817 | char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) | |
818 | { | |
819 | size_t size; | |
820 | char *buf; | |
821 | ||
822 | if (!s) | |
823 | return NULL; | |
824 | ||
825 | size = strlen(s) + 1; | |
826 | buf = devm_kmalloc(dev, size, gfp); | |
827 | if (buf) | |
828 | memcpy(buf, s, size); | |
829 | return buf; | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(devm_kstrdup); | |
832 | ||
09d1ea1c BG |
833 | /** |
834 | * devm_kstrdup_const - resource managed conditional string duplication | |
835 | * @dev: device for which to duplicate the string | |
836 | * @s: the string to duplicate | |
837 | * @gfp: the GFP mask used in the kmalloc() call when allocating memory | |
838 | * | |
839 | * Strings allocated by devm_kstrdup_const will be automatically freed when | |
840 | * the associated device is detached. | |
841 | * | |
842 | * RETURNS: | |
843 | * Source string if it is in .rodata section otherwise it falls back to | |
844 | * devm_kstrdup. | |
845 | */ | |
846 | const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp) | |
847 | { | |
848 | if (is_kernel_rodata((unsigned long)s)) | |
849 | return s; | |
850 | ||
851 | return devm_kstrdup(dev, s, gfp); | |
852 | } | |
853 | EXPORT_SYMBOL_GPL(devm_kstrdup_const); | |
854 | ||
75f2a4ea | 855 | /** |
bef59c50 GU |
856 | * devm_kvasprintf - Allocate resource managed space and format a string |
857 | * into that. | |
75f2a4ea HS |
858 | * @dev: Device to allocate memory for |
859 | * @gfp: the GFP mask used in the devm_kmalloc() call when | |
860 | * allocating memory | |
bef59c50 GU |
861 | * @fmt: The printf()-style format string |
862 | * @ap: Arguments for the format string | |
75f2a4ea HS |
863 | * RETURNS: |
864 | * Pointer to allocated string on success, NULL on failure. | |
865 | */ | |
866 | char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt, | |
867 | va_list ap) | |
868 | { | |
869 | unsigned int len; | |
870 | char *p; | |
871 | va_list aq; | |
872 | ||
873 | va_copy(aq, ap); | |
874 | len = vsnprintf(NULL, 0, fmt, aq); | |
875 | va_end(aq); | |
876 | ||
877 | p = devm_kmalloc(dev, len+1, gfp); | |
878 | if (!p) | |
879 | return NULL; | |
880 | ||
881 | vsnprintf(p, len+1, fmt, ap); | |
882 | ||
883 | return p; | |
884 | } | |
885 | EXPORT_SYMBOL(devm_kvasprintf); | |
886 | ||
887 | /** | |
bef59c50 GU |
888 | * devm_kasprintf - Allocate resource managed space and format a string |
889 | * into that. | |
75f2a4ea HS |
890 | * @dev: Device to allocate memory for |
891 | * @gfp: the GFP mask used in the devm_kmalloc() call when | |
892 | * allocating memory | |
bef59c50 GU |
893 | * @fmt: The printf()-style format string |
894 | * @...: Arguments for the format string | |
75f2a4ea HS |
895 | * RETURNS: |
896 | * Pointer to allocated string on success, NULL on failure. | |
897 | */ | |
898 | char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) | |
899 | { | |
900 | va_list ap; | |
901 | char *p; | |
902 | ||
903 | va_start(ap, fmt); | |
904 | p = devm_kvasprintf(dev, gfp, fmt, ap); | |
905 | va_end(ap); | |
906 | ||
907 | return p; | |
908 | } | |
909 | EXPORT_SYMBOL_GPL(devm_kasprintf); | |
910 | ||
9ac7849e | 911 | /** |
d3e6975e | 912 | * devm_kfree - Resource-managed kfree |
9ac7849e TH |
913 | * @dev: Device this memory belongs to |
914 | * @p: Memory to free | |
915 | * | |
64c862a8 | 916 | * Free memory allocated with devm_kmalloc(). |
9ac7849e | 917 | */ |
0571967d | 918 | void devm_kfree(struct device *dev, const void *p) |
9ac7849e TH |
919 | { |
920 | int rc; | |
921 | ||
09d1ea1c BG |
922 | /* |
923 | * Special case: pointer to a string in .rodata returned by | |
924 | * devm_kstrdup_const(). | |
925 | */ | |
926 | if (unlikely(is_kernel_rodata((unsigned long)p))) | |
927 | return; | |
928 | ||
0571967d BG |
929 | rc = devres_destroy(dev, devm_kmalloc_release, |
930 | devm_kmalloc_match, (void *)p); | |
9ac7849e TH |
931 | WARN_ON(rc); |
932 | } | |
933 | EXPORT_SYMBOL_GPL(devm_kfree); | |
3046365b SP |
934 | |
935 | /** | |
936 | * devm_kmemdup - Resource-managed kmemdup | |
937 | * @dev: Device this memory belongs to | |
938 | * @src: Memory region to duplicate | |
939 | * @len: Memory region length | |
940 | * @gfp: GFP mask to use | |
941 | * | |
942 | * Duplicate region of a memory using resource managed kmalloc | |
943 | */ | |
944 | void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp) | |
945 | { | |
946 | void *p; | |
947 | ||
948 | p = devm_kmalloc(dev, len, gfp); | |
949 | if (p) | |
950 | memcpy(p, src, len); | |
951 | ||
952 | return p; | |
953 | } | |
954 | EXPORT_SYMBOL_GPL(devm_kmemdup); | |
43339bed EB |
955 | |
956 | struct pages_devres { | |
957 | unsigned long addr; | |
958 | unsigned int order; | |
959 | }; | |
960 | ||
961 | static int devm_pages_match(struct device *dev, void *res, void *p) | |
962 | { | |
963 | struct pages_devres *devres = res; | |
964 | struct pages_devres *target = p; | |
965 | ||
966 | return devres->addr == target->addr; | |
967 | } | |
968 | ||
969 | static void devm_pages_release(struct device *dev, void *res) | |
970 | { | |
971 | struct pages_devres *devres = res; | |
972 | ||
973 | free_pages(devres->addr, devres->order); | |
974 | } | |
975 | ||
976 | /** | |
977 | * devm_get_free_pages - Resource-managed __get_free_pages | |
978 | * @dev: Device to allocate memory for | |
979 | * @gfp_mask: Allocation gfp flags | |
980 | * @order: Allocation size is (1 << order) pages | |
981 | * | |
982 | * Managed get_free_pages. Memory allocated with this function is | |
983 | * automatically freed on driver detach. | |
984 | * | |
985 | * RETURNS: | |
986 | * Address of allocated memory on success, 0 on failure. | |
987 | */ | |
988 | ||
989 | unsigned long devm_get_free_pages(struct device *dev, | |
990 | gfp_t gfp_mask, unsigned int order) | |
991 | { | |
992 | struct pages_devres *devres; | |
993 | unsigned long addr; | |
994 | ||
995 | addr = __get_free_pages(gfp_mask, order); | |
996 | ||
997 | if (unlikely(!addr)) | |
998 | return 0; | |
999 | ||
1000 | devres = devres_alloc(devm_pages_release, | |
1001 | sizeof(struct pages_devres), GFP_KERNEL); | |
1002 | if (unlikely(!devres)) { | |
1003 | free_pages(addr, order); | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | devres->addr = addr; | |
1008 | devres->order = order; | |
1009 | ||
1010 | devres_add(dev, devres); | |
1011 | return addr; | |
1012 | } | |
1013 | EXPORT_SYMBOL_GPL(devm_get_free_pages); | |
1014 | ||
1015 | /** | |
1016 | * devm_free_pages - Resource-managed free_pages | |
1017 | * @dev: Device this memory belongs to | |
1018 | * @addr: Memory to free | |
1019 | * | |
1020 | * Free memory allocated with devm_get_free_pages(). Unlike free_pages, | |
1021 | * there is no need to supply the @order. | |
1022 | */ | |
1023 | void devm_free_pages(struct device *dev, unsigned long addr) | |
1024 | { | |
1025 | struct pages_devres devres = { .addr = addr }; | |
1026 | ||
1027 | WARN_ON(devres_release(dev, devm_pages_release, devm_pages_match, | |
1028 | &devres)); | |
1029 | } | |
1030 | EXPORT_SYMBOL_GPL(devm_free_pages); | |
ff86aae3 MB |
1031 | |
1032 | static void devm_percpu_release(struct device *dev, void *pdata) | |
1033 | { | |
1034 | void __percpu *p; | |
1035 | ||
1036 | p = *(void __percpu **)pdata; | |
1037 | free_percpu(p); | |
1038 | } | |
1039 | ||
1040 | static int devm_percpu_match(struct device *dev, void *data, void *p) | |
1041 | { | |
1042 | struct devres *devr = container_of(data, struct devres, data); | |
1043 | ||
1044 | return *(void **)devr->data == p; | |
1045 | } | |
1046 | ||
1047 | /** | |
1048 | * __devm_alloc_percpu - Resource-managed alloc_percpu | |
1049 | * @dev: Device to allocate per-cpu memory for | |
1050 | * @size: Size of per-cpu memory to allocate | |
1051 | * @align: Alignment of per-cpu memory to allocate | |
1052 | * | |
1053 | * Managed alloc_percpu. Per-cpu memory allocated with this function is | |
1054 | * automatically freed on driver detach. | |
1055 | * | |
1056 | * RETURNS: | |
1057 | * Pointer to allocated memory on success, NULL on failure. | |
1058 | */ | |
1059 | void __percpu *__devm_alloc_percpu(struct device *dev, size_t size, | |
1060 | size_t align) | |
1061 | { | |
1062 | void *p; | |
1063 | void __percpu *pcpu; | |
1064 | ||
1065 | pcpu = __alloc_percpu(size, align); | |
1066 | if (!pcpu) | |
1067 | return NULL; | |
1068 | ||
1069 | p = devres_alloc(devm_percpu_release, sizeof(void *), GFP_KERNEL); | |
1070 | if (!p) { | |
1071 | free_percpu(pcpu); | |
1072 | return NULL; | |
1073 | } | |
1074 | ||
1075 | *(void __percpu **)p = pcpu; | |
1076 | ||
1077 | devres_add(dev, p); | |
1078 | ||
1079 | return pcpu; | |
1080 | } | |
1081 | EXPORT_SYMBOL_GPL(__devm_alloc_percpu); | |
1082 | ||
1083 | /** | |
1084 | * devm_free_percpu - Resource-managed free_percpu | |
1085 | * @dev: Device this memory belongs to | |
1086 | * @pdata: Per-cpu memory to free | |
1087 | * | |
1088 | * Free memory allocated with devm_alloc_percpu(). | |
1089 | */ | |
1090 | void devm_free_percpu(struct device *dev, void __percpu *pdata) | |
1091 | { | |
1092 | WARN_ON(devres_destroy(dev, devm_percpu_release, devm_percpu_match, | |
1093 | (void *)pdata)); | |
1094 | } | |
1095 | EXPORT_SYMBOL_GPL(devm_free_percpu); |