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Commit | Line | Data |
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3ac7fe5a TG |
1 | /* |
2 | * Generic infrastructure for lifetime debugging of objects. | |
3 | * | |
4 | * Started by Thomas Gleixner | |
5 | * | |
6 | * Copyright (C) 2008, Thomas Gleixner <tglx@linutronix.de> | |
7 | * | |
8 | * For licencing details see kernel-base/COPYING | |
9 | */ | |
719e4843 FF |
10 | |
11 | #define pr_fmt(fmt) "ODEBUG: " fmt | |
12 | ||
3ac7fe5a TG |
13 | #include <linux/debugobjects.h> |
14 | #include <linux/interrupt.h> | |
d43c36dc | 15 | #include <linux/sched.h> |
68db0cf1 | 16 | #include <linux/sched/task_stack.h> |
3ac7fe5a TG |
17 | #include <linux/seq_file.h> |
18 | #include <linux/debugfs.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
3ac7fe5a | 20 | #include <linux/hash.h> |
caba4cbb | 21 | #include <linux/kmemleak.h> |
3ac7fe5a TG |
22 | |
23 | #define ODEBUG_HASH_BITS 14 | |
24 | #define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS) | |
25 | ||
0b6ec8c0 | 26 | #define ODEBUG_POOL_SIZE 1024 |
3ac7fe5a TG |
27 | #define ODEBUG_POOL_MIN_LEVEL 256 |
28 | ||
29 | #define ODEBUG_CHUNK_SHIFT PAGE_SHIFT | |
30 | #define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT) | |
31 | #define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1)) | |
32 | ||
33 | struct debug_bucket { | |
34 | struct hlist_head list; | |
aef9cb05 | 35 | raw_spinlock_t lock; |
3ac7fe5a TG |
36 | }; |
37 | ||
38 | static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE]; | |
39 | ||
1be1cb7b | 40 | static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE] __initdata; |
3ac7fe5a | 41 | |
aef9cb05 | 42 | static DEFINE_RAW_SPINLOCK(pool_lock); |
3ac7fe5a TG |
43 | |
44 | static HLIST_HEAD(obj_pool); | |
45 | ||
46 | static int obj_pool_min_free = ODEBUG_POOL_SIZE; | |
47 | static int obj_pool_free = ODEBUG_POOL_SIZE; | |
48 | static int obj_pool_used; | |
49 | static int obj_pool_max_used; | |
50 | static struct kmem_cache *obj_cache; | |
51 | ||
52 | static int debug_objects_maxchain __read_mostly; | |
53 | static int debug_objects_fixups __read_mostly; | |
54 | static int debug_objects_warnings __read_mostly; | |
3ae70205 IM |
55 | static int debug_objects_enabled __read_mostly |
56 | = CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT; | |
97dd552e WL |
57 | static int debug_objects_pool_size __read_mostly |
58 | = ODEBUG_POOL_SIZE; | |
59 | static int debug_objects_pool_min_level __read_mostly | |
60 | = ODEBUG_POOL_MIN_LEVEL; | |
3ac7fe5a TG |
61 | static struct debug_obj_descr *descr_test __read_mostly; |
62 | ||
c4b73aab | 63 | /* |
0cad93c3 | 64 | * Track numbers of kmem_cache_alloc()/free() calls done. |
c4b73aab | 65 | */ |
0cad93c3 | 66 | static int debug_objects_allocated; |
c4b73aab WL |
67 | static int debug_objects_freed; |
68 | ||
337fff8b TG |
69 | static void free_obj_work(struct work_struct *work); |
70 | static DECLARE_WORK(debug_obj_work, free_obj_work); | |
71 | ||
3ac7fe5a TG |
72 | static int __init enable_object_debug(char *str) |
73 | { | |
74 | debug_objects_enabled = 1; | |
75 | return 0; | |
76 | } | |
3e8ebb5c KM |
77 | |
78 | static int __init disable_object_debug(char *str) | |
79 | { | |
80 | debug_objects_enabled = 0; | |
81 | return 0; | |
82 | } | |
83 | ||
3ac7fe5a | 84 | early_param("debug_objects", enable_object_debug); |
3e8ebb5c | 85 | early_param("no_debug_objects", disable_object_debug); |
3ac7fe5a TG |
86 | |
87 | static const char *obj_states[ODEBUG_STATE_MAX] = { | |
88 | [ODEBUG_STATE_NONE] = "none", | |
89 | [ODEBUG_STATE_INIT] = "initialized", | |
90 | [ODEBUG_STATE_INACTIVE] = "inactive", | |
91 | [ODEBUG_STATE_ACTIVE] = "active", | |
92 | [ODEBUG_STATE_DESTROYED] = "destroyed", | |
93 | [ODEBUG_STATE_NOTAVAILABLE] = "not available", | |
94 | }; | |
95 | ||
1fda107d | 96 | static void fill_pool(void) |
3ac7fe5a TG |
97 | { |
98 | gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN; | |
99 | struct debug_obj *new; | |
50db04dd | 100 | unsigned long flags; |
3ac7fe5a | 101 | |
97dd552e | 102 | if (likely(obj_pool_free >= debug_objects_pool_min_level)) |
1fda107d | 103 | return; |
3ac7fe5a TG |
104 | |
105 | if (unlikely(!obj_cache)) | |
1fda107d | 106 | return; |
3ac7fe5a | 107 | |
97dd552e | 108 | while (obj_pool_free < debug_objects_pool_min_level) { |
3ac7fe5a TG |
109 | |
110 | new = kmem_cache_zalloc(obj_cache, gfp); | |
111 | if (!new) | |
3340808c | 112 | return; |
3ac7fe5a | 113 | |
caba4cbb | 114 | kmemleak_ignore(new); |
aef9cb05 | 115 | raw_spin_lock_irqsave(&pool_lock, flags); |
3ac7fe5a | 116 | hlist_add_head(&new->node, &obj_pool); |
0cad93c3 | 117 | debug_objects_allocated++; |
3ac7fe5a | 118 | obj_pool_free++; |
aef9cb05 | 119 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
3ac7fe5a | 120 | } |
3ac7fe5a TG |
121 | } |
122 | ||
123 | /* | |
124 | * Lookup an object in the hash bucket. | |
125 | */ | |
126 | static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b) | |
127 | { | |
3ac7fe5a TG |
128 | struct debug_obj *obj; |
129 | int cnt = 0; | |
130 | ||
b67bfe0d | 131 | hlist_for_each_entry(obj, &b->list, node) { |
3ac7fe5a TG |
132 | cnt++; |
133 | if (obj->object == addr) | |
134 | return obj; | |
135 | } | |
136 | if (cnt > debug_objects_maxchain) | |
137 | debug_objects_maxchain = cnt; | |
138 | ||
139 | return NULL; | |
140 | } | |
141 | ||
142 | /* | |
50db04dd | 143 | * Allocate a new object. If the pool is empty, switch off the debugger. |
673d62cc | 144 | * Must be called with interrupts disabled. |
3ac7fe5a TG |
145 | */ |
146 | static struct debug_obj * | |
147 | alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr) | |
148 | { | |
149 | struct debug_obj *obj = NULL; | |
3ac7fe5a | 150 | |
aef9cb05 | 151 | raw_spin_lock(&pool_lock); |
3ac7fe5a TG |
152 | if (obj_pool.first) { |
153 | obj = hlist_entry(obj_pool.first, typeof(*obj), node); | |
154 | ||
155 | obj->object = addr; | |
156 | obj->descr = descr; | |
157 | obj->state = ODEBUG_STATE_NONE; | |
a5d8e467 | 158 | obj->astate = 0; |
3ac7fe5a TG |
159 | hlist_del(&obj->node); |
160 | ||
161 | hlist_add_head(&obj->node, &b->list); | |
162 | ||
163 | obj_pool_used++; | |
164 | if (obj_pool_used > obj_pool_max_used) | |
165 | obj_pool_max_used = obj_pool_used; | |
166 | ||
167 | obj_pool_free--; | |
168 | if (obj_pool_free < obj_pool_min_free) | |
169 | obj_pool_min_free = obj_pool_free; | |
170 | } | |
aef9cb05 | 171 | raw_spin_unlock(&pool_lock); |
3ac7fe5a | 172 | |
3ac7fe5a TG |
173 | return obj; |
174 | } | |
175 | ||
176 | /* | |
337fff8b | 177 | * workqueue function to free objects. |
858274b6 WL |
178 | * |
179 | * To reduce contention on the global pool_lock, the actual freeing of | |
180 | * debug objects will be delayed if the pool_lock is busy. We also free | |
181 | * the objects in a batch of 4 for each lock/unlock cycle. | |
3ac7fe5a | 182 | */ |
858274b6 WL |
183 | #define ODEBUG_FREE_BATCH 4 |
184 | ||
337fff8b | 185 | static void free_obj_work(struct work_struct *work) |
3ac7fe5a | 186 | { |
858274b6 | 187 | struct debug_obj *objs[ODEBUG_FREE_BATCH]; |
673d62cc | 188 | unsigned long flags; |
858274b6 | 189 | int i; |
3ac7fe5a | 190 | |
858274b6 WL |
191 | if (!raw_spin_trylock_irqsave(&pool_lock, flags)) |
192 | return; | |
193 | while (obj_pool_free >= debug_objects_pool_size + ODEBUG_FREE_BATCH) { | |
194 | for (i = 0; i < ODEBUG_FREE_BATCH; i++) { | |
195 | objs[i] = hlist_entry(obj_pool.first, | |
196 | typeof(*objs[0]), node); | |
197 | hlist_del(&objs[i]->node); | |
198 | } | |
199 | ||
200 | obj_pool_free -= ODEBUG_FREE_BATCH; | |
201 | debug_objects_freed += ODEBUG_FREE_BATCH; | |
337fff8b TG |
202 | /* |
203 | * We release pool_lock across kmem_cache_free() to | |
204 | * avoid contention on pool_lock. | |
205 | */ | |
aef9cb05 | 206 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
858274b6 WL |
207 | for (i = 0; i < ODEBUG_FREE_BATCH; i++) |
208 | kmem_cache_free(obj_cache, objs[i]); | |
209 | if (!raw_spin_trylock_irqsave(&pool_lock, flags)) | |
210 | return; | |
3ac7fe5a | 211 | } |
aef9cb05 | 212 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
337fff8b TG |
213 | } |
214 | ||
215 | /* | |
216 | * Put the object back into the pool and schedule work to free objects | |
217 | * if necessary. | |
218 | */ | |
219 | static void free_object(struct debug_obj *obj) | |
220 | { | |
221 | unsigned long flags; | |
222 | int sched = 0; | |
223 | ||
aef9cb05 | 224 | raw_spin_lock_irqsave(&pool_lock, flags); |
337fff8b TG |
225 | /* |
226 | * schedule work when the pool is filled and the cache is | |
227 | * initialized: | |
228 | */ | |
97dd552e | 229 | if (obj_pool_free > debug_objects_pool_size && obj_cache) |
7092dff2 | 230 | sched = 1; |
337fff8b TG |
231 | hlist_add_head(&obj->node, &obj_pool); |
232 | obj_pool_free++; | |
233 | obj_pool_used--; | |
aef9cb05 | 234 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
337fff8b TG |
235 | if (sched) |
236 | schedule_work(&debug_obj_work); | |
3ac7fe5a TG |
237 | } |
238 | ||
239 | /* | |
240 | * We run out of memory. That means we probably have tons of objects | |
241 | * allocated. | |
242 | */ | |
243 | static void debug_objects_oom(void) | |
244 | { | |
245 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 246 | struct hlist_node *tmp; |
673d62cc | 247 | HLIST_HEAD(freelist); |
3ac7fe5a TG |
248 | struct debug_obj *obj; |
249 | unsigned long flags; | |
250 | int i; | |
251 | ||
719e4843 | 252 | pr_warn("Out of memory. ODEBUG disabled\n"); |
3ac7fe5a TG |
253 | |
254 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
aef9cb05 | 255 | raw_spin_lock_irqsave(&db->lock, flags); |
673d62cc | 256 | hlist_move_list(&db->list, &freelist); |
aef9cb05 | 257 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc VN |
258 | |
259 | /* Now free them */ | |
b67bfe0d | 260 | hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
3ac7fe5a TG |
261 | hlist_del(&obj->node); |
262 | free_object(obj); | |
263 | } | |
3ac7fe5a TG |
264 | } |
265 | } | |
266 | ||
267 | /* | |
268 | * We use the pfn of the address for the hash. That way we can check | |
269 | * for freed objects simply by checking the affected bucket. | |
270 | */ | |
271 | static struct debug_bucket *get_bucket(unsigned long addr) | |
272 | { | |
273 | unsigned long hash; | |
274 | ||
275 | hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS); | |
276 | return &obj_hash[hash]; | |
277 | } | |
278 | ||
279 | static void debug_print_object(struct debug_obj *obj, char *msg) | |
280 | { | |
99777288 | 281 | struct debug_obj_descr *descr = obj->descr; |
3ac7fe5a TG |
282 | static int limit; |
283 | ||
99777288 SG |
284 | if (limit < 5 && descr != descr_test) { |
285 | void *hint = descr->debug_hint ? | |
286 | descr->debug_hint(obj->object) : NULL; | |
3ac7fe5a | 287 | limit++; |
a5d8e467 | 288 | WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " |
99777288 | 289 | "object type: %s hint: %pS\n", |
a5d8e467 | 290 | msg, obj_states[obj->state], obj->astate, |
99777288 | 291 | descr->name, hint); |
3ac7fe5a TG |
292 | } |
293 | debug_objects_warnings++; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Try to repair the damage, so we have a better chance to get useful | |
298 | * debug output. | |
299 | */ | |
b1e4d9d8 CD |
300 | static bool |
301 | debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state), | |
3ac7fe5a TG |
302 | void * addr, enum debug_obj_state state) |
303 | { | |
b1e4d9d8 CD |
304 | if (fixup && fixup(addr, state)) { |
305 | debug_objects_fixups++; | |
306 | return true; | |
307 | } | |
308 | return false; | |
3ac7fe5a TG |
309 | } |
310 | ||
311 | static void debug_object_is_on_stack(void *addr, int onstack) | |
312 | { | |
3ac7fe5a TG |
313 | int is_on_stack; |
314 | static int limit; | |
315 | ||
316 | if (limit > 4) | |
317 | return; | |
318 | ||
8b05c7e6 | 319 | is_on_stack = object_is_on_stack(addr); |
3ac7fe5a TG |
320 | if (is_on_stack == onstack) |
321 | return; | |
322 | ||
323 | limit++; | |
324 | if (is_on_stack) | |
719e4843 | 325 | pr_warn("object is on stack, but not annotated\n"); |
3ac7fe5a | 326 | else |
719e4843 | 327 | pr_warn("object is not on stack, but annotated\n"); |
3ac7fe5a TG |
328 | WARN_ON(1); |
329 | } | |
330 | ||
331 | static void | |
332 | __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) | |
333 | { | |
334 | enum debug_obj_state state; | |
335 | struct debug_bucket *db; | |
336 | struct debug_obj *obj; | |
337 | unsigned long flags; | |
338 | ||
50db04dd VN |
339 | fill_pool(); |
340 | ||
3ac7fe5a TG |
341 | db = get_bucket((unsigned long) addr); |
342 | ||
aef9cb05 | 343 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
344 | |
345 | obj = lookup_object(addr, db); | |
346 | if (!obj) { | |
347 | obj = alloc_object(addr, db, descr); | |
348 | if (!obj) { | |
349 | debug_objects_enabled = 0; | |
aef9cb05 | 350 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
351 | debug_objects_oom(); |
352 | return; | |
353 | } | |
354 | debug_object_is_on_stack(addr, onstack); | |
355 | } | |
356 | ||
357 | switch (obj->state) { | |
358 | case ODEBUG_STATE_NONE: | |
359 | case ODEBUG_STATE_INIT: | |
360 | case ODEBUG_STATE_INACTIVE: | |
361 | obj->state = ODEBUG_STATE_INIT; | |
362 | break; | |
363 | ||
364 | case ODEBUG_STATE_ACTIVE: | |
365 | debug_print_object(obj, "init"); | |
366 | state = obj->state; | |
aef9cb05 | 367 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
368 | debug_object_fixup(descr->fixup_init, addr, state); |
369 | return; | |
370 | ||
371 | case ODEBUG_STATE_DESTROYED: | |
372 | debug_print_object(obj, "init"); | |
373 | break; | |
374 | default: | |
375 | break; | |
376 | } | |
377 | ||
aef9cb05 | 378 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
379 | } |
380 | ||
381 | /** | |
382 | * debug_object_init - debug checks when an object is initialized | |
383 | * @addr: address of the object | |
384 | * @descr: pointer to an object specific debug description structure | |
385 | */ | |
386 | void debug_object_init(void *addr, struct debug_obj_descr *descr) | |
387 | { | |
388 | if (!debug_objects_enabled) | |
389 | return; | |
390 | ||
391 | __debug_object_init(addr, descr, 0); | |
392 | } | |
f8ff04e2 | 393 | EXPORT_SYMBOL_GPL(debug_object_init); |
3ac7fe5a TG |
394 | |
395 | /** | |
396 | * debug_object_init_on_stack - debug checks when an object on stack is | |
397 | * initialized | |
398 | * @addr: address of the object | |
399 | * @descr: pointer to an object specific debug description structure | |
400 | */ | |
401 | void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) | |
402 | { | |
403 | if (!debug_objects_enabled) | |
404 | return; | |
405 | ||
406 | __debug_object_init(addr, descr, 1); | |
407 | } | |
f8ff04e2 | 408 | EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
3ac7fe5a TG |
409 | |
410 | /** | |
411 | * debug_object_activate - debug checks when an object is activated | |
412 | * @addr: address of the object | |
413 | * @descr: pointer to an object specific debug description structure | |
b778ae25 | 414 | * Returns 0 for success, -EINVAL for check failed. |
3ac7fe5a | 415 | */ |
b778ae25 | 416 | int debug_object_activate(void *addr, struct debug_obj_descr *descr) |
3ac7fe5a TG |
417 | { |
418 | enum debug_obj_state state; | |
419 | struct debug_bucket *db; | |
420 | struct debug_obj *obj; | |
421 | unsigned long flags; | |
b778ae25 | 422 | int ret; |
feac18dd SB |
423 | struct debug_obj o = { .object = addr, |
424 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
425 | .descr = descr }; | |
3ac7fe5a TG |
426 | |
427 | if (!debug_objects_enabled) | |
b778ae25 | 428 | return 0; |
3ac7fe5a TG |
429 | |
430 | db = get_bucket((unsigned long) addr); | |
431 | ||
aef9cb05 | 432 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
433 | |
434 | obj = lookup_object(addr, db); | |
435 | if (obj) { | |
436 | switch (obj->state) { | |
437 | case ODEBUG_STATE_INIT: | |
438 | case ODEBUG_STATE_INACTIVE: | |
439 | obj->state = ODEBUG_STATE_ACTIVE; | |
b778ae25 | 440 | ret = 0; |
3ac7fe5a TG |
441 | break; |
442 | ||
443 | case ODEBUG_STATE_ACTIVE: | |
444 | debug_print_object(obj, "activate"); | |
445 | state = obj->state; | |
aef9cb05 | 446 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 447 | ret = debug_object_fixup(descr->fixup_activate, addr, state); |
e7a8e78b | 448 | return ret ? 0 : -EINVAL; |
3ac7fe5a TG |
449 | |
450 | case ODEBUG_STATE_DESTROYED: | |
451 | debug_print_object(obj, "activate"); | |
b778ae25 | 452 | ret = -EINVAL; |
3ac7fe5a TG |
453 | break; |
454 | default: | |
b778ae25 | 455 | ret = 0; |
3ac7fe5a TG |
456 | break; |
457 | } | |
aef9cb05 | 458 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 459 | return ret; |
3ac7fe5a TG |
460 | } |
461 | ||
aef9cb05 | 462 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 463 | /* |
b9fdac7f CD |
464 | * We are here when a static object is activated. We |
465 | * let the type specific code confirm whether this is | |
466 | * true or not. if true, we just make sure that the | |
467 | * static object is tracked in the object tracker. If | |
468 | * not, this must be a bug, so we try to fix it up. | |
3ac7fe5a | 469 | */ |
b9fdac7f CD |
470 | if (descr->is_static_object && descr->is_static_object(addr)) { |
471 | /* track this static object */ | |
472 | debug_object_init(addr, descr); | |
473 | debug_object_activate(addr, descr); | |
474 | } else { | |
feac18dd | 475 | debug_print_object(&o, "activate"); |
b9fdac7f CD |
476 | ret = debug_object_fixup(descr->fixup_activate, addr, |
477 | ODEBUG_STATE_NOTAVAILABLE); | |
478 | return ret ? 0 : -EINVAL; | |
b778ae25 PM |
479 | } |
480 | return 0; | |
3ac7fe5a | 481 | } |
f8ff04e2 | 482 | EXPORT_SYMBOL_GPL(debug_object_activate); |
3ac7fe5a TG |
483 | |
484 | /** | |
485 | * debug_object_deactivate - debug checks when an object is deactivated | |
486 | * @addr: address of the object | |
487 | * @descr: pointer to an object specific debug description structure | |
488 | */ | |
489 | void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) | |
490 | { | |
491 | struct debug_bucket *db; | |
492 | struct debug_obj *obj; | |
493 | unsigned long flags; | |
494 | ||
495 | if (!debug_objects_enabled) | |
496 | return; | |
497 | ||
498 | db = get_bucket((unsigned long) addr); | |
499 | ||
aef9cb05 | 500 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
501 | |
502 | obj = lookup_object(addr, db); | |
503 | if (obj) { | |
504 | switch (obj->state) { | |
505 | case ODEBUG_STATE_INIT: | |
506 | case ODEBUG_STATE_INACTIVE: | |
507 | case ODEBUG_STATE_ACTIVE: | |
a5d8e467 MD |
508 | if (!obj->astate) |
509 | obj->state = ODEBUG_STATE_INACTIVE; | |
510 | else | |
511 | debug_print_object(obj, "deactivate"); | |
3ac7fe5a TG |
512 | break; |
513 | ||
514 | case ODEBUG_STATE_DESTROYED: | |
515 | debug_print_object(obj, "deactivate"); | |
516 | break; | |
517 | default: | |
518 | break; | |
519 | } | |
520 | } else { | |
521 | struct debug_obj o = { .object = addr, | |
522 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
523 | .descr = descr }; | |
524 | ||
525 | debug_print_object(&o, "deactivate"); | |
526 | } | |
527 | ||
aef9cb05 | 528 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 529 | } |
f8ff04e2 | 530 | EXPORT_SYMBOL_GPL(debug_object_deactivate); |
3ac7fe5a TG |
531 | |
532 | /** | |
533 | * debug_object_destroy - debug checks when an object is destroyed | |
534 | * @addr: address of the object | |
535 | * @descr: pointer to an object specific debug description structure | |
536 | */ | |
537 | void debug_object_destroy(void *addr, struct debug_obj_descr *descr) | |
538 | { | |
539 | enum debug_obj_state state; | |
540 | struct debug_bucket *db; | |
541 | struct debug_obj *obj; | |
542 | unsigned long flags; | |
543 | ||
544 | if (!debug_objects_enabled) | |
545 | return; | |
546 | ||
547 | db = get_bucket((unsigned long) addr); | |
548 | ||
aef9cb05 | 549 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
550 | |
551 | obj = lookup_object(addr, db); | |
552 | if (!obj) | |
553 | goto out_unlock; | |
554 | ||
555 | switch (obj->state) { | |
556 | case ODEBUG_STATE_NONE: | |
557 | case ODEBUG_STATE_INIT: | |
558 | case ODEBUG_STATE_INACTIVE: | |
559 | obj->state = ODEBUG_STATE_DESTROYED; | |
560 | break; | |
561 | case ODEBUG_STATE_ACTIVE: | |
562 | debug_print_object(obj, "destroy"); | |
563 | state = obj->state; | |
aef9cb05 | 564 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
565 | debug_object_fixup(descr->fixup_destroy, addr, state); |
566 | return; | |
567 | ||
568 | case ODEBUG_STATE_DESTROYED: | |
569 | debug_print_object(obj, "destroy"); | |
570 | break; | |
571 | default: | |
572 | break; | |
573 | } | |
574 | out_unlock: | |
aef9cb05 | 575 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 576 | } |
f8ff04e2 | 577 | EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a TG |
578 | |
579 | /** | |
580 | * debug_object_free - debug checks when an object is freed | |
581 | * @addr: address of the object | |
582 | * @descr: pointer to an object specific debug description structure | |
583 | */ | |
584 | void debug_object_free(void *addr, struct debug_obj_descr *descr) | |
585 | { | |
586 | enum debug_obj_state state; | |
587 | struct debug_bucket *db; | |
588 | struct debug_obj *obj; | |
589 | unsigned long flags; | |
590 | ||
591 | if (!debug_objects_enabled) | |
592 | return; | |
593 | ||
594 | db = get_bucket((unsigned long) addr); | |
595 | ||
aef9cb05 | 596 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
597 | |
598 | obj = lookup_object(addr, db); | |
599 | if (!obj) | |
600 | goto out_unlock; | |
601 | ||
602 | switch (obj->state) { | |
603 | case ODEBUG_STATE_ACTIVE: | |
604 | debug_print_object(obj, "free"); | |
605 | state = obj->state; | |
aef9cb05 | 606 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
607 | debug_object_fixup(descr->fixup_free, addr, state); |
608 | return; | |
609 | default: | |
610 | hlist_del(&obj->node); | |
aef9cb05 | 611 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 612 | free_object(obj); |
673d62cc | 613 | return; |
3ac7fe5a TG |
614 | } |
615 | out_unlock: | |
aef9cb05 | 616 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 617 | } |
f8ff04e2 | 618 | EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a | 619 | |
b84d435c CC |
620 | /** |
621 | * debug_object_assert_init - debug checks when object should be init-ed | |
622 | * @addr: address of the object | |
623 | * @descr: pointer to an object specific debug description structure | |
624 | */ | |
625 | void debug_object_assert_init(void *addr, struct debug_obj_descr *descr) | |
626 | { | |
627 | struct debug_bucket *db; | |
628 | struct debug_obj *obj; | |
629 | unsigned long flags; | |
630 | ||
631 | if (!debug_objects_enabled) | |
632 | return; | |
633 | ||
634 | db = get_bucket((unsigned long) addr); | |
635 | ||
636 | raw_spin_lock_irqsave(&db->lock, flags); | |
637 | ||
638 | obj = lookup_object(addr, db); | |
639 | if (!obj) { | |
640 | struct debug_obj o = { .object = addr, | |
641 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
642 | .descr = descr }; | |
643 | ||
644 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
645 | /* | |
b9fdac7f CD |
646 | * Maybe the object is static, and we let the type specific |
647 | * code confirm. Track this static object if true, else invoke | |
648 | * fixup. | |
b84d435c | 649 | */ |
b9fdac7f CD |
650 | if (descr->is_static_object && descr->is_static_object(addr)) { |
651 | /* Track this static object */ | |
652 | debug_object_init(addr, descr); | |
653 | } else { | |
b84d435c | 654 | debug_print_object(&o, "assert_init"); |
b9fdac7f CD |
655 | debug_object_fixup(descr->fixup_assert_init, addr, |
656 | ODEBUG_STATE_NOTAVAILABLE); | |
657 | } | |
b84d435c CC |
658 | return; |
659 | } | |
660 | ||
661 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
662 | } | |
f8ff04e2 | 663 | EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435c | 664 | |
a5d8e467 MD |
665 | /** |
666 | * debug_object_active_state - debug checks object usage state machine | |
667 | * @addr: address of the object | |
668 | * @descr: pointer to an object specific debug description structure | |
669 | * @expect: expected state | |
670 | * @next: state to move to if expected state is found | |
671 | */ | |
672 | void | |
673 | debug_object_active_state(void *addr, struct debug_obj_descr *descr, | |
674 | unsigned int expect, unsigned int next) | |
675 | { | |
676 | struct debug_bucket *db; | |
677 | struct debug_obj *obj; | |
678 | unsigned long flags; | |
679 | ||
680 | if (!debug_objects_enabled) | |
681 | return; | |
682 | ||
683 | db = get_bucket((unsigned long) addr); | |
684 | ||
685 | raw_spin_lock_irqsave(&db->lock, flags); | |
686 | ||
687 | obj = lookup_object(addr, db); | |
688 | if (obj) { | |
689 | switch (obj->state) { | |
690 | case ODEBUG_STATE_ACTIVE: | |
691 | if (obj->astate == expect) | |
692 | obj->astate = next; | |
693 | else | |
694 | debug_print_object(obj, "active_state"); | |
695 | break; | |
696 | ||
697 | default: | |
698 | debug_print_object(obj, "active_state"); | |
699 | break; | |
700 | } | |
701 | } else { | |
702 | struct debug_obj o = { .object = addr, | |
703 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
704 | .descr = descr }; | |
705 | ||
706 | debug_print_object(&o, "active_state"); | |
707 | } | |
708 | ||
709 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
710 | } | |
f8ff04e2 | 711 | EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467 | 712 | |
3ac7fe5a TG |
713 | #ifdef CONFIG_DEBUG_OBJECTS_FREE |
714 | static void __debug_check_no_obj_freed(const void *address, unsigned long size) | |
715 | { | |
716 | unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; | |
b67bfe0d | 717 | struct hlist_node *tmp; |
673d62cc | 718 | HLIST_HEAD(freelist); |
3ac7fe5a TG |
719 | struct debug_obj_descr *descr; |
720 | enum debug_obj_state state; | |
721 | struct debug_bucket *db; | |
722 | struct debug_obj *obj; | |
723 | int cnt; | |
724 | ||
725 | saddr = (unsigned long) address; | |
726 | eaddr = saddr + size; | |
727 | paddr = saddr & ODEBUG_CHUNK_MASK; | |
728 | chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); | |
729 | chunks >>= ODEBUG_CHUNK_SHIFT; | |
730 | ||
731 | for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { | |
732 | db = get_bucket(paddr); | |
733 | ||
734 | repeat: | |
735 | cnt = 0; | |
aef9cb05 | 736 | raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d | 737 | hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a TG |
738 | cnt++; |
739 | oaddr = (unsigned long) obj->object; | |
740 | if (oaddr < saddr || oaddr >= eaddr) | |
741 | continue; | |
742 | ||
743 | switch (obj->state) { | |
744 | case ODEBUG_STATE_ACTIVE: | |
745 | debug_print_object(obj, "free"); | |
746 | descr = obj->descr; | |
747 | state = obj->state; | |
aef9cb05 | 748 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
749 | debug_object_fixup(descr->fixup_free, |
750 | (void *) oaddr, state); | |
751 | goto repeat; | |
752 | default: | |
753 | hlist_del(&obj->node); | |
673d62cc | 754 | hlist_add_head(&obj->node, &freelist); |
3ac7fe5a TG |
755 | break; |
756 | } | |
757 | } | |
aef9cb05 | 758 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc VN |
759 | |
760 | /* Now free them */ | |
b67bfe0d | 761 | hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
673d62cc VN |
762 | hlist_del(&obj->node); |
763 | free_object(obj); | |
764 | } | |
765 | ||
3ac7fe5a TG |
766 | if (cnt > debug_objects_maxchain) |
767 | debug_objects_maxchain = cnt; | |
768 | } | |
769 | } | |
770 | ||
771 | void debug_check_no_obj_freed(const void *address, unsigned long size) | |
772 | { | |
773 | if (debug_objects_enabled) | |
774 | __debug_check_no_obj_freed(address, size); | |
775 | } | |
776 | #endif | |
777 | ||
778 | #ifdef CONFIG_DEBUG_FS | |
779 | ||
780 | static int debug_stats_show(struct seq_file *m, void *v) | |
781 | { | |
782 | seq_printf(m, "max_chain :%d\n", debug_objects_maxchain); | |
783 | seq_printf(m, "warnings :%d\n", debug_objects_warnings); | |
784 | seq_printf(m, "fixups :%d\n", debug_objects_fixups); | |
785 | seq_printf(m, "pool_free :%d\n", obj_pool_free); | |
786 | seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free); | |
787 | seq_printf(m, "pool_used :%d\n", obj_pool_used); | |
788 | seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used); | |
0cad93c3 WL |
789 | seq_printf(m, "objs_allocated:%d\n", debug_objects_allocated); |
790 | seq_printf(m, "objs_freed :%d\n", debug_objects_freed); | |
3ac7fe5a TG |
791 | return 0; |
792 | } | |
793 | ||
794 | static int debug_stats_open(struct inode *inode, struct file *filp) | |
795 | { | |
796 | return single_open(filp, debug_stats_show, NULL); | |
797 | } | |
798 | ||
799 | static const struct file_operations debug_stats_fops = { | |
800 | .open = debug_stats_open, | |
801 | .read = seq_read, | |
802 | .llseek = seq_lseek, | |
803 | .release = single_release, | |
804 | }; | |
805 | ||
806 | static int __init debug_objects_init_debugfs(void) | |
807 | { | |
808 | struct dentry *dbgdir, *dbgstats; | |
809 | ||
810 | if (!debug_objects_enabled) | |
811 | return 0; | |
812 | ||
813 | dbgdir = debugfs_create_dir("debug_objects", NULL); | |
814 | if (!dbgdir) | |
815 | return -ENOMEM; | |
816 | ||
817 | dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL, | |
818 | &debug_stats_fops); | |
819 | if (!dbgstats) | |
820 | goto err; | |
821 | ||
822 | return 0; | |
823 | ||
824 | err: | |
825 | debugfs_remove(dbgdir); | |
826 | ||
827 | return -ENOMEM; | |
828 | } | |
829 | __initcall(debug_objects_init_debugfs); | |
830 | ||
831 | #else | |
832 | static inline void debug_objects_init_debugfs(void) { } | |
833 | #endif | |
834 | ||
835 | #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST | |
836 | ||
837 | /* Random data structure for the self test */ | |
838 | struct self_test { | |
839 | unsigned long dummy1[6]; | |
840 | int static_init; | |
841 | unsigned long dummy2[3]; | |
842 | }; | |
843 | ||
844 | static __initdata struct debug_obj_descr descr_type_test; | |
845 | ||
b9fdac7f CD |
846 | static bool __init is_static_object(void *addr) |
847 | { | |
848 | struct self_test *obj = addr; | |
849 | ||
850 | return obj->static_init; | |
851 | } | |
852 | ||
3ac7fe5a TG |
853 | /* |
854 | * fixup_init is called when: | |
855 | * - an active object is initialized | |
856 | */ | |
b1e4d9d8 | 857 | static bool __init fixup_init(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
858 | { |
859 | struct self_test *obj = addr; | |
860 | ||
861 | switch (state) { | |
862 | case ODEBUG_STATE_ACTIVE: | |
863 | debug_object_deactivate(obj, &descr_type_test); | |
864 | debug_object_init(obj, &descr_type_test); | |
b1e4d9d8 | 865 | return true; |
3ac7fe5a | 866 | default: |
b1e4d9d8 | 867 | return false; |
3ac7fe5a TG |
868 | } |
869 | } | |
870 | ||
871 | /* | |
872 | * fixup_activate is called when: | |
873 | * - an active object is activated | |
b9fdac7f | 874 | * - an unknown non-static object is activated |
3ac7fe5a | 875 | */ |
b1e4d9d8 | 876 | static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
877 | { |
878 | struct self_test *obj = addr; | |
879 | ||
880 | switch (state) { | |
881 | case ODEBUG_STATE_NOTAVAILABLE: | |
b1e4d9d8 | 882 | return true; |
3ac7fe5a TG |
883 | case ODEBUG_STATE_ACTIVE: |
884 | debug_object_deactivate(obj, &descr_type_test); | |
885 | debug_object_activate(obj, &descr_type_test); | |
b1e4d9d8 | 886 | return true; |
3ac7fe5a TG |
887 | |
888 | default: | |
b1e4d9d8 | 889 | return false; |
3ac7fe5a TG |
890 | } |
891 | } | |
892 | ||
893 | /* | |
894 | * fixup_destroy is called when: | |
895 | * - an active object is destroyed | |
896 | */ | |
b1e4d9d8 | 897 | static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
898 | { |
899 | struct self_test *obj = addr; | |
900 | ||
901 | switch (state) { | |
902 | case ODEBUG_STATE_ACTIVE: | |
903 | debug_object_deactivate(obj, &descr_type_test); | |
904 | debug_object_destroy(obj, &descr_type_test); | |
b1e4d9d8 | 905 | return true; |
3ac7fe5a | 906 | default: |
b1e4d9d8 | 907 | return false; |
3ac7fe5a TG |
908 | } |
909 | } | |
910 | ||
911 | /* | |
912 | * fixup_free is called when: | |
913 | * - an active object is freed | |
914 | */ | |
b1e4d9d8 | 915 | static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
916 | { |
917 | struct self_test *obj = addr; | |
918 | ||
919 | switch (state) { | |
920 | case ODEBUG_STATE_ACTIVE: | |
921 | debug_object_deactivate(obj, &descr_type_test); | |
922 | debug_object_free(obj, &descr_type_test); | |
b1e4d9d8 | 923 | return true; |
3ac7fe5a | 924 | default: |
b1e4d9d8 | 925 | return false; |
3ac7fe5a TG |
926 | } |
927 | } | |
928 | ||
1fb2f77c | 929 | static int __init |
3ac7fe5a TG |
930 | check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) |
931 | { | |
932 | struct debug_bucket *db; | |
933 | struct debug_obj *obj; | |
934 | unsigned long flags; | |
935 | int res = -EINVAL; | |
936 | ||
937 | db = get_bucket((unsigned long) addr); | |
938 | ||
aef9cb05 | 939 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
940 | |
941 | obj = lookup_object(addr, db); | |
942 | if (!obj && state != ODEBUG_STATE_NONE) { | |
5cd2b459 | 943 | WARN(1, KERN_ERR "ODEBUG: selftest object not found\n"); |
3ac7fe5a TG |
944 | goto out; |
945 | } | |
946 | if (obj && obj->state != state) { | |
5cd2b459 | 947 | WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n", |
3ac7fe5a | 948 | obj->state, state); |
3ac7fe5a TG |
949 | goto out; |
950 | } | |
951 | if (fixups != debug_objects_fixups) { | |
5cd2b459 | 952 | WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n", |
3ac7fe5a | 953 | fixups, debug_objects_fixups); |
3ac7fe5a TG |
954 | goto out; |
955 | } | |
956 | if (warnings != debug_objects_warnings) { | |
5cd2b459 | 957 | WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n", |
3ac7fe5a | 958 | warnings, debug_objects_warnings); |
3ac7fe5a TG |
959 | goto out; |
960 | } | |
961 | res = 0; | |
962 | out: | |
aef9cb05 | 963 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
964 | if (res) |
965 | debug_objects_enabled = 0; | |
966 | return res; | |
967 | } | |
968 | ||
969 | static __initdata struct debug_obj_descr descr_type_test = { | |
970 | .name = "selftest", | |
b9fdac7f | 971 | .is_static_object = is_static_object, |
3ac7fe5a TG |
972 | .fixup_init = fixup_init, |
973 | .fixup_activate = fixup_activate, | |
974 | .fixup_destroy = fixup_destroy, | |
975 | .fixup_free = fixup_free, | |
976 | }; | |
977 | ||
978 | static __initdata struct self_test obj = { .static_init = 0 }; | |
979 | ||
980 | static void __init debug_objects_selftest(void) | |
981 | { | |
982 | int fixups, oldfixups, warnings, oldwarnings; | |
983 | unsigned long flags; | |
984 | ||
985 | local_irq_save(flags); | |
986 | ||
987 | fixups = oldfixups = debug_objects_fixups; | |
988 | warnings = oldwarnings = debug_objects_warnings; | |
989 | descr_test = &descr_type_test; | |
990 | ||
991 | debug_object_init(&obj, &descr_type_test); | |
992 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
993 | goto out; | |
994 | debug_object_activate(&obj, &descr_type_test); | |
995 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
996 | goto out; | |
997 | debug_object_activate(&obj, &descr_type_test); | |
998 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) | |
999 | goto out; | |
1000 | debug_object_deactivate(&obj, &descr_type_test); | |
1001 | if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) | |
1002 | goto out; | |
1003 | debug_object_destroy(&obj, &descr_type_test); | |
1004 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) | |
1005 | goto out; | |
1006 | debug_object_init(&obj, &descr_type_test); | |
1007 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1008 | goto out; | |
1009 | debug_object_activate(&obj, &descr_type_test); | |
1010 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1011 | goto out; | |
1012 | debug_object_deactivate(&obj, &descr_type_test); | |
1013 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1014 | goto out; | |
1015 | debug_object_free(&obj, &descr_type_test); | |
1016 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1017 | goto out; | |
1018 | ||
1019 | obj.static_init = 1; | |
1020 | debug_object_activate(&obj, &descr_type_test); | |
9f78ff00 | 1021 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a TG |
1022 | goto out; |
1023 | debug_object_init(&obj, &descr_type_test); | |
1024 | if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) | |
1025 | goto out; | |
1026 | debug_object_free(&obj, &descr_type_test); | |
1027 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1028 | goto out; | |
1029 | ||
1030 | #ifdef CONFIG_DEBUG_OBJECTS_FREE | |
1031 | debug_object_init(&obj, &descr_type_test); | |
1032 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
1033 | goto out; | |
1034 | debug_object_activate(&obj, &descr_type_test); | |
1035 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
1036 | goto out; | |
1037 | __debug_check_no_obj_freed(&obj, sizeof(obj)); | |
1038 | if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) | |
1039 | goto out; | |
1040 | #endif | |
719e4843 | 1041 | pr_info("selftest passed\n"); |
3ac7fe5a TG |
1042 | |
1043 | out: | |
1044 | debug_objects_fixups = oldfixups; | |
1045 | debug_objects_warnings = oldwarnings; | |
1046 | descr_test = NULL; | |
1047 | ||
1048 | local_irq_restore(flags); | |
1049 | } | |
1050 | #else | |
1051 | static inline void debug_objects_selftest(void) { } | |
1052 | #endif | |
1053 | ||
1054 | /* | |
1055 | * Called during early boot to initialize the hash buckets and link | |
1056 | * the static object pool objects into the poll list. After this call | |
1057 | * the object tracker is fully operational. | |
1058 | */ | |
1059 | void __init debug_objects_early_init(void) | |
1060 | { | |
1061 | int i; | |
1062 | ||
1063 | for (i = 0; i < ODEBUG_HASH_SIZE; i++) | |
aef9cb05 | 1064 | raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a TG |
1065 | |
1066 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) | |
1067 | hlist_add_head(&obj_static_pool[i].node, &obj_pool); | |
1068 | } | |
1069 | ||
1be1cb7b TG |
1070 | /* |
1071 | * Convert the statically allocated objects to dynamic ones: | |
1072 | */ | |
1fb2f77c | 1073 | static int __init debug_objects_replace_static_objects(void) |
1be1cb7b TG |
1074 | { |
1075 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 1076 | struct hlist_node *tmp; |
1be1cb7b TG |
1077 | struct debug_obj *obj, *new; |
1078 | HLIST_HEAD(objects); | |
1079 | int i, cnt = 0; | |
1080 | ||
1081 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) { | |
1082 | obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); | |
1083 | if (!obj) | |
1084 | goto free; | |
caba4cbb | 1085 | kmemleak_ignore(obj); |
1be1cb7b TG |
1086 | hlist_add_head(&obj->node, &objects); |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * When debug_objects_mem_init() is called we know that only | |
1091 | * one CPU is up, so disabling interrupts is enough | |
1092 | * protection. This avoids the lockdep hell of lock ordering. | |
1093 | */ | |
1094 | local_irq_disable(); | |
1095 | ||
1096 | /* Remove the statically allocated objects from the pool */ | |
b67bfe0d | 1097 | hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b TG |
1098 | hlist_del(&obj->node); |
1099 | /* Move the allocated objects to the pool */ | |
1100 | hlist_move_list(&objects, &obj_pool); | |
1101 | ||
1102 | /* Replace the active object references */ | |
1103 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
1104 | hlist_move_list(&db->list, &objects); | |
1105 | ||
b67bfe0d | 1106 | hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b TG |
1107 | new = hlist_entry(obj_pool.first, typeof(*obj), node); |
1108 | hlist_del(&new->node); | |
1109 | /* copy object data */ | |
1110 | *new = *obj; | |
1111 | hlist_add_head(&new->node, &db->list); | |
1112 | cnt++; | |
1113 | } | |
1114 | } | |
765a5e0c | 1115 | local_irq_enable(); |
1be1cb7b | 1116 | |
c0f35cc0 FF |
1117 | pr_debug("%d of %d active objects replaced\n", |
1118 | cnt, obj_pool_used); | |
1be1cb7b TG |
1119 | return 0; |
1120 | free: | |
b67bfe0d | 1121 | hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b TG |
1122 | hlist_del(&obj->node); |
1123 | kmem_cache_free(obj_cache, obj); | |
1124 | } | |
1125 | return -ENOMEM; | |
1126 | } | |
1127 | ||
3ac7fe5a TG |
1128 | /* |
1129 | * Called after the kmem_caches are functional to setup a dedicated | |
1130 | * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag | |
1131 | * prevents that the debug code is called on kmem_cache_free() for the | |
1132 | * debug tracker objects to avoid recursive calls. | |
1133 | */ | |
1134 | void __init debug_objects_mem_init(void) | |
1135 | { | |
1136 | if (!debug_objects_enabled) | |
1137 | return; | |
1138 | ||
1139 | obj_cache = kmem_cache_create("debug_objects_cache", | |
1140 | sizeof (struct debug_obj), 0, | |
1141 | SLAB_DEBUG_OBJECTS, NULL); | |
1142 | ||
1be1cb7b | 1143 | if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a | 1144 | debug_objects_enabled = 0; |
1be1cb7b TG |
1145 | if (obj_cache) |
1146 | kmem_cache_destroy(obj_cache); | |
719e4843 | 1147 | pr_warn("out of memory.\n"); |
1be1cb7b | 1148 | } else |
3ac7fe5a | 1149 | debug_objects_selftest(); |
97dd552e WL |
1150 | |
1151 | /* | |
1152 | * Increase the thresholds for allocating and freeing objects | |
1153 | * according to the number of possible CPUs available in the system. | |
1154 | */ | |
1155 | debug_objects_pool_size += num_possible_cpus() * 32; | |
1156 | debug_objects_pool_min_level += num_possible_cpus() * 4; | |
3ac7fe5a | 1157 | } |