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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 DC |
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 DC |
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) | |
f9c10413 JFG |
325 | pr_warn("object %p is on stack %p, but NOT annotated.\n", addr, |
326 | task_stack_page(current)); | |
3ac7fe5a | 327 | else |
f9c10413 JFG |
328 | pr_warn("object %p is NOT on stack %p, but annotated.\n", addr, |
329 | task_stack_page(current)); | |
330 | ||
3ac7fe5a TG |
331 | WARN_ON(1); |
332 | } | |
333 | ||
334 | static void | |
335 | __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) | |
336 | { | |
337 | enum debug_obj_state state; | |
338 | struct debug_bucket *db; | |
339 | struct debug_obj *obj; | |
340 | unsigned long flags; | |
341 | ||
50db04dd VN |
342 | fill_pool(); |
343 | ||
3ac7fe5a TG |
344 | db = get_bucket((unsigned long) addr); |
345 | ||
aef9cb05 | 346 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
347 | |
348 | obj = lookup_object(addr, db); | |
349 | if (!obj) { | |
350 | obj = alloc_object(addr, db, descr); | |
351 | if (!obj) { | |
352 | debug_objects_enabled = 0; | |
aef9cb05 | 353 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
354 | debug_objects_oom(); |
355 | return; | |
356 | } | |
357 | debug_object_is_on_stack(addr, onstack); | |
358 | } | |
359 | ||
360 | switch (obj->state) { | |
361 | case ODEBUG_STATE_NONE: | |
362 | case ODEBUG_STATE_INIT: | |
363 | case ODEBUG_STATE_INACTIVE: | |
364 | obj->state = ODEBUG_STATE_INIT; | |
365 | break; | |
366 | ||
367 | case ODEBUG_STATE_ACTIVE: | |
368 | debug_print_object(obj, "init"); | |
369 | state = obj->state; | |
aef9cb05 | 370 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
371 | debug_object_fixup(descr->fixup_init, addr, state); |
372 | return; | |
373 | ||
374 | case ODEBUG_STATE_DESTROYED: | |
375 | debug_print_object(obj, "init"); | |
376 | break; | |
377 | default: | |
378 | break; | |
379 | } | |
380 | ||
aef9cb05 | 381 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
382 | } |
383 | ||
384 | /** | |
385 | * debug_object_init - debug checks when an object is initialized | |
386 | * @addr: address of the object | |
387 | * @descr: pointer to an object specific debug description structure | |
388 | */ | |
389 | void debug_object_init(void *addr, struct debug_obj_descr *descr) | |
390 | { | |
391 | if (!debug_objects_enabled) | |
392 | return; | |
393 | ||
394 | __debug_object_init(addr, descr, 0); | |
395 | } | |
f8ff04e2 | 396 | EXPORT_SYMBOL_GPL(debug_object_init); |
3ac7fe5a TG |
397 | |
398 | /** | |
399 | * debug_object_init_on_stack - debug checks when an object on stack is | |
400 | * initialized | |
401 | * @addr: address of the object | |
402 | * @descr: pointer to an object specific debug description structure | |
403 | */ | |
404 | void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) | |
405 | { | |
406 | if (!debug_objects_enabled) | |
407 | return; | |
408 | ||
409 | __debug_object_init(addr, descr, 1); | |
410 | } | |
f8ff04e2 | 411 | EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
3ac7fe5a TG |
412 | |
413 | /** | |
414 | * debug_object_activate - debug checks when an object is activated | |
415 | * @addr: address of the object | |
416 | * @descr: pointer to an object specific debug description structure | |
b778ae25 | 417 | * Returns 0 for success, -EINVAL for check failed. |
3ac7fe5a | 418 | */ |
b778ae25 | 419 | int debug_object_activate(void *addr, struct debug_obj_descr *descr) |
3ac7fe5a TG |
420 | { |
421 | enum debug_obj_state state; | |
422 | struct debug_bucket *db; | |
423 | struct debug_obj *obj; | |
424 | unsigned long flags; | |
b778ae25 | 425 | int ret; |
feac18dd SB |
426 | struct debug_obj o = { .object = addr, |
427 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
428 | .descr = descr }; | |
3ac7fe5a TG |
429 | |
430 | if (!debug_objects_enabled) | |
b778ae25 | 431 | return 0; |
3ac7fe5a TG |
432 | |
433 | db = get_bucket((unsigned long) addr); | |
434 | ||
aef9cb05 | 435 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
436 | |
437 | obj = lookup_object(addr, db); | |
438 | if (obj) { | |
439 | switch (obj->state) { | |
440 | case ODEBUG_STATE_INIT: | |
441 | case ODEBUG_STATE_INACTIVE: | |
442 | obj->state = ODEBUG_STATE_ACTIVE; | |
b778ae25 | 443 | ret = 0; |
3ac7fe5a TG |
444 | break; |
445 | ||
446 | case ODEBUG_STATE_ACTIVE: | |
447 | debug_print_object(obj, "activate"); | |
448 | state = obj->state; | |
aef9cb05 | 449 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 450 | ret = debug_object_fixup(descr->fixup_activate, addr, state); |
e7a8e78b | 451 | return ret ? 0 : -EINVAL; |
3ac7fe5a TG |
452 | |
453 | case ODEBUG_STATE_DESTROYED: | |
454 | debug_print_object(obj, "activate"); | |
b778ae25 | 455 | ret = -EINVAL; |
3ac7fe5a TG |
456 | break; |
457 | default: | |
b778ae25 | 458 | ret = 0; |
3ac7fe5a TG |
459 | break; |
460 | } | |
aef9cb05 | 461 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 462 | return ret; |
3ac7fe5a TG |
463 | } |
464 | ||
aef9cb05 | 465 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 466 | /* |
b9fdac7f DC |
467 | * We are here when a static object is activated. We |
468 | * let the type specific code confirm whether this is | |
469 | * true or not. if true, we just make sure that the | |
470 | * static object is tracked in the object tracker. If | |
471 | * not, this must be a bug, so we try to fix it up. | |
3ac7fe5a | 472 | */ |
b9fdac7f DC |
473 | if (descr->is_static_object && descr->is_static_object(addr)) { |
474 | /* track this static object */ | |
475 | debug_object_init(addr, descr); | |
476 | debug_object_activate(addr, descr); | |
477 | } else { | |
feac18dd | 478 | debug_print_object(&o, "activate"); |
b9fdac7f DC |
479 | ret = debug_object_fixup(descr->fixup_activate, addr, |
480 | ODEBUG_STATE_NOTAVAILABLE); | |
481 | return ret ? 0 : -EINVAL; | |
b778ae25 PM |
482 | } |
483 | return 0; | |
3ac7fe5a | 484 | } |
f8ff04e2 | 485 | EXPORT_SYMBOL_GPL(debug_object_activate); |
3ac7fe5a TG |
486 | |
487 | /** | |
488 | * debug_object_deactivate - debug checks when an object is deactivated | |
489 | * @addr: address of the object | |
490 | * @descr: pointer to an object specific debug description structure | |
491 | */ | |
492 | void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) | |
493 | { | |
494 | struct debug_bucket *db; | |
495 | struct debug_obj *obj; | |
496 | unsigned long flags; | |
497 | ||
498 | if (!debug_objects_enabled) | |
499 | return; | |
500 | ||
501 | db = get_bucket((unsigned long) addr); | |
502 | ||
aef9cb05 | 503 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
504 | |
505 | obj = lookup_object(addr, db); | |
506 | if (obj) { | |
507 | switch (obj->state) { | |
508 | case ODEBUG_STATE_INIT: | |
509 | case ODEBUG_STATE_INACTIVE: | |
510 | case ODEBUG_STATE_ACTIVE: | |
a5d8e467 MD |
511 | if (!obj->astate) |
512 | obj->state = ODEBUG_STATE_INACTIVE; | |
513 | else | |
514 | debug_print_object(obj, "deactivate"); | |
3ac7fe5a TG |
515 | break; |
516 | ||
517 | case ODEBUG_STATE_DESTROYED: | |
518 | debug_print_object(obj, "deactivate"); | |
519 | break; | |
520 | default: | |
521 | break; | |
522 | } | |
523 | } else { | |
524 | struct debug_obj o = { .object = addr, | |
525 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
526 | .descr = descr }; | |
527 | ||
528 | debug_print_object(&o, "deactivate"); | |
529 | } | |
530 | ||
aef9cb05 | 531 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 532 | } |
f8ff04e2 | 533 | EXPORT_SYMBOL_GPL(debug_object_deactivate); |
3ac7fe5a TG |
534 | |
535 | /** | |
536 | * debug_object_destroy - debug checks when an object is destroyed | |
537 | * @addr: address of the object | |
538 | * @descr: pointer to an object specific debug description structure | |
539 | */ | |
540 | void debug_object_destroy(void *addr, struct debug_obj_descr *descr) | |
541 | { | |
542 | enum debug_obj_state state; | |
543 | struct debug_bucket *db; | |
544 | struct debug_obj *obj; | |
545 | unsigned long flags; | |
546 | ||
547 | if (!debug_objects_enabled) | |
548 | return; | |
549 | ||
550 | db = get_bucket((unsigned long) addr); | |
551 | ||
aef9cb05 | 552 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
553 | |
554 | obj = lookup_object(addr, db); | |
555 | if (!obj) | |
556 | goto out_unlock; | |
557 | ||
558 | switch (obj->state) { | |
559 | case ODEBUG_STATE_NONE: | |
560 | case ODEBUG_STATE_INIT: | |
561 | case ODEBUG_STATE_INACTIVE: | |
562 | obj->state = ODEBUG_STATE_DESTROYED; | |
563 | break; | |
564 | case ODEBUG_STATE_ACTIVE: | |
565 | debug_print_object(obj, "destroy"); | |
566 | state = obj->state; | |
aef9cb05 | 567 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
568 | debug_object_fixup(descr->fixup_destroy, addr, state); |
569 | return; | |
570 | ||
571 | case ODEBUG_STATE_DESTROYED: | |
572 | debug_print_object(obj, "destroy"); | |
573 | break; | |
574 | default: | |
575 | break; | |
576 | } | |
577 | out_unlock: | |
aef9cb05 | 578 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 579 | } |
f8ff04e2 | 580 | EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a TG |
581 | |
582 | /** | |
583 | * debug_object_free - debug checks when an object is freed | |
584 | * @addr: address of the object | |
585 | * @descr: pointer to an object specific debug description structure | |
586 | */ | |
587 | void debug_object_free(void *addr, struct debug_obj_descr *descr) | |
588 | { | |
589 | enum debug_obj_state state; | |
590 | struct debug_bucket *db; | |
591 | struct debug_obj *obj; | |
592 | unsigned long flags; | |
593 | ||
594 | if (!debug_objects_enabled) | |
595 | return; | |
596 | ||
597 | db = get_bucket((unsigned long) addr); | |
598 | ||
aef9cb05 | 599 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
600 | |
601 | obj = lookup_object(addr, db); | |
602 | if (!obj) | |
603 | goto out_unlock; | |
604 | ||
605 | switch (obj->state) { | |
606 | case ODEBUG_STATE_ACTIVE: | |
607 | debug_print_object(obj, "free"); | |
608 | state = obj->state; | |
aef9cb05 | 609 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
610 | debug_object_fixup(descr->fixup_free, addr, state); |
611 | return; | |
612 | default: | |
613 | hlist_del(&obj->node); | |
aef9cb05 | 614 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 615 | free_object(obj); |
673d62cc | 616 | return; |
3ac7fe5a TG |
617 | } |
618 | out_unlock: | |
aef9cb05 | 619 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 620 | } |
f8ff04e2 | 621 | EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a | 622 | |
b84d435c CC |
623 | /** |
624 | * debug_object_assert_init - debug checks when object should be init-ed | |
625 | * @addr: address of the object | |
626 | * @descr: pointer to an object specific debug description structure | |
627 | */ | |
628 | void debug_object_assert_init(void *addr, struct debug_obj_descr *descr) | |
629 | { | |
630 | struct debug_bucket *db; | |
631 | struct debug_obj *obj; | |
632 | unsigned long flags; | |
633 | ||
634 | if (!debug_objects_enabled) | |
635 | return; | |
636 | ||
637 | db = get_bucket((unsigned long) addr); | |
638 | ||
639 | raw_spin_lock_irqsave(&db->lock, flags); | |
640 | ||
641 | obj = lookup_object(addr, db); | |
642 | if (!obj) { | |
643 | struct debug_obj o = { .object = addr, | |
644 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
645 | .descr = descr }; | |
646 | ||
647 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
648 | /* | |
b9fdac7f DC |
649 | * Maybe the object is static, and we let the type specific |
650 | * code confirm. Track this static object if true, else invoke | |
651 | * fixup. | |
b84d435c | 652 | */ |
b9fdac7f DC |
653 | if (descr->is_static_object && descr->is_static_object(addr)) { |
654 | /* Track this static object */ | |
655 | debug_object_init(addr, descr); | |
656 | } else { | |
b84d435c | 657 | debug_print_object(&o, "assert_init"); |
b9fdac7f DC |
658 | debug_object_fixup(descr->fixup_assert_init, addr, |
659 | ODEBUG_STATE_NOTAVAILABLE); | |
660 | } | |
b84d435c CC |
661 | return; |
662 | } | |
663 | ||
664 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
665 | } | |
f8ff04e2 | 666 | EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435c | 667 | |
a5d8e467 MD |
668 | /** |
669 | * debug_object_active_state - debug checks object usage state machine | |
670 | * @addr: address of the object | |
671 | * @descr: pointer to an object specific debug description structure | |
672 | * @expect: expected state | |
673 | * @next: state to move to if expected state is found | |
674 | */ | |
675 | void | |
676 | debug_object_active_state(void *addr, struct debug_obj_descr *descr, | |
677 | unsigned int expect, unsigned int next) | |
678 | { | |
679 | struct debug_bucket *db; | |
680 | struct debug_obj *obj; | |
681 | unsigned long flags; | |
682 | ||
683 | if (!debug_objects_enabled) | |
684 | return; | |
685 | ||
686 | db = get_bucket((unsigned long) addr); | |
687 | ||
688 | raw_spin_lock_irqsave(&db->lock, flags); | |
689 | ||
690 | obj = lookup_object(addr, db); | |
691 | if (obj) { | |
692 | switch (obj->state) { | |
693 | case ODEBUG_STATE_ACTIVE: | |
694 | if (obj->astate == expect) | |
695 | obj->astate = next; | |
696 | else | |
697 | debug_print_object(obj, "active_state"); | |
698 | break; | |
699 | ||
700 | default: | |
701 | debug_print_object(obj, "active_state"); | |
702 | break; | |
703 | } | |
704 | } else { | |
705 | struct debug_obj o = { .object = addr, | |
706 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
707 | .descr = descr }; | |
708 | ||
709 | debug_print_object(&o, "active_state"); | |
710 | } | |
711 | ||
712 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
713 | } | |
f8ff04e2 | 714 | EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467 | 715 | |
3ac7fe5a TG |
716 | #ifdef CONFIG_DEBUG_OBJECTS_FREE |
717 | static void __debug_check_no_obj_freed(const void *address, unsigned long size) | |
718 | { | |
719 | unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; | |
b67bfe0d | 720 | struct hlist_node *tmp; |
673d62cc | 721 | HLIST_HEAD(freelist); |
3ac7fe5a TG |
722 | struct debug_obj_descr *descr; |
723 | enum debug_obj_state state; | |
724 | struct debug_bucket *db; | |
725 | struct debug_obj *obj; | |
726 | int cnt; | |
727 | ||
728 | saddr = (unsigned long) address; | |
729 | eaddr = saddr + size; | |
730 | paddr = saddr & ODEBUG_CHUNK_MASK; | |
731 | chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); | |
732 | chunks >>= ODEBUG_CHUNK_SHIFT; | |
733 | ||
734 | for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { | |
735 | db = get_bucket(paddr); | |
736 | ||
737 | repeat: | |
738 | cnt = 0; | |
aef9cb05 | 739 | raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d | 740 | hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a TG |
741 | cnt++; |
742 | oaddr = (unsigned long) obj->object; | |
743 | if (oaddr < saddr || oaddr >= eaddr) | |
744 | continue; | |
745 | ||
746 | switch (obj->state) { | |
747 | case ODEBUG_STATE_ACTIVE: | |
748 | debug_print_object(obj, "free"); | |
749 | descr = obj->descr; | |
750 | state = obj->state; | |
aef9cb05 | 751 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
752 | debug_object_fixup(descr->fixup_free, |
753 | (void *) oaddr, state); | |
754 | goto repeat; | |
755 | default: | |
756 | hlist_del(&obj->node); | |
673d62cc | 757 | hlist_add_head(&obj->node, &freelist); |
3ac7fe5a TG |
758 | break; |
759 | } | |
760 | } | |
aef9cb05 | 761 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc VN |
762 | |
763 | /* Now free them */ | |
b67bfe0d | 764 | hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
673d62cc VN |
765 | hlist_del(&obj->node); |
766 | free_object(obj); | |
767 | } | |
768 | ||
3ac7fe5a TG |
769 | if (cnt > debug_objects_maxchain) |
770 | debug_objects_maxchain = cnt; | |
771 | } | |
772 | } | |
773 | ||
774 | void debug_check_no_obj_freed(const void *address, unsigned long size) | |
775 | { | |
776 | if (debug_objects_enabled) | |
777 | __debug_check_no_obj_freed(address, size); | |
778 | } | |
779 | #endif | |
780 | ||
781 | #ifdef CONFIG_DEBUG_FS | |
782 | ||
783 | static int debug_stats_show(struct seq_file *m, void *v) | |
784 | { | |
785 | seq_printf(m, "max_chain :%d\n", debug_objects_maxchain); | |
786 | seq_printf(m, "warnings :%d\n", debug_objects_warnings); | |
787 | seq_printf(m, "fixups :%d\n", debug_objects_fixups); | |
788 | seq_printf(m, "pool_free :%d\n", obj_pool_free); | |
789 | seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free); | |
790 | seq_printf(m, "pool_used :%d\n", obj_pool_used); | |
791 | seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used); | |
0cad93c3 WL |
792 | seq_printf(m, "objs_allocated:%d\n", debug_objects_allocated); |
793 | seq_printf(m, "objs_freed :%d\n", debug_objects_freed); | |
3ac7fe5a TG |
794 | return 0; |
795 | } | |
796 | ||
797 | static int debug_stats_open(struct inode *inode, struct file *filp) | |
798 | { | |
799 | return single_open(filp, debug_stats_show, NULL); | |
800 | } | |
801 | ||
802 | static const struct file_operations debug_stats_fops = { | |
803 | .open = debug_stats_open, | |
804 | .read = seq_read, | |
805 | .llseek = seq_lseek, | |
806 | .release = single_release, | |
807 | }; | |
808 | ||
809 | static int __init debug_objects_init_debugfs(void) | |
810 | { | |
811 | struct dentry *dbgdir, *dbgstats; | |
812 | ||
813 | if (!debug_objects_enabled) | |
814 | return 0; | |
815 | ||
816 | dbgdir = debugfs_create_dir("debug_objects", NULL); | |
817 | if (!dbgdir) | |
818 | return -ENOMEM; | |
819 | ||
820 | dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL, | |
821 | &debug_stats_fops); | |
822 | if (!dbgstats) | |
823 | goto err; | |
824 | ||
825 | return 0; | |
826 | ||
827 | err: | |
828 | debugfs_remove(dbgdir); | |
829 | ||
830 | return -ENOMEM; | |
831 | } | |
832 | __initcall(debug_objects_init_debugfs); | |
833 | ||
834 | #else | |
835 | static inline void debug_objects_init_debugfs(void) { } | |
836 | #endif | |
837 | ||
838 | #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST | |
839 | ||
840 | /* Random data structure for the self test */ | |
841 | struct self_test { | |
842 | unsigned long dummy1[6]; | |
843 | int static_init; | |
844 | unsigned long dummy2[3]; | |
845 | }; | |
846 | ||
847 | static __initdata struct debug_obj_descr descr_type_test; | |
848 | ||
b9fdac7f DC |
849 | static bool __init is_static_object(void *addr) |
850 | { | |
851 | struct self_test *obj = addr; | |
852 | ||
853 | return obj->static_init; | |
854 | } | |
855 | ||
3ac7fe5a TG |
856 | /* |
857 | * fixup_init is called when: | |
858 | * - an active object is initialized | |
859 | */ | |
b1e4d9d8 | 860 | static bool __init fixup_init(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
861 | { |
862 | struct self_test *obj = addr; | |
863 | ||
864 | switch (state) { | |
865 | case ODEBUG_STATE_ACTIVE: | |
866 | debug_object_deactivate(obj, &descr_type_test); | |
867 | debug_object_init(obj, &descr_type_test); | |
b1e4d9d8 | 868 | return true; |
3ac7fe5a | 869 | default: |
b1e4d9d8 | 870 | return false; |
3ac7fe5a TG |
871 | } |
872 | } | |
873 | ||
874 | /* | |
875 | * fixup_activate is called when: | |
876 | * - an active object is activated | |
b9fdac7f | 877 | * - an unknown non-static object is activated |
3ac7fe5a | 878 | */ |
b1e4d9d8 | 879 | static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
880 | { |
881 | struct self_test *obj = addr; | |
882 | ||
883 | switch (state) { | |
884 | case ODEBUG_STATE_NOTAVAILABLE: | |
b1e4d9d8 | 885 | return true; |
3ac7fe5a TG |
886 | case ODEBUG_STATE_ACTIVE: |
887 | debug_object_deactivate(obj, &descr_type_test); | |
888 | debug_object_activate(obj, &descr_type_test); | |
b1e4d9d8 | 889 | return true; |
3ac7fe5a TG |
890 | |
891 | default: | |
b1e4d9d8 | 892 | return false; |
3ac7fe5a TG |
893 | } |
894 | } | |
895 | ||
896 | /* | |
897 | * fixup_destroy is called when: | |
898 | * - an active object is destroyed | |
899 | */ | |
b1e4d9d8 | 900 | static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
901 | { |
902 | struct self_test *obj = addr; | |
903 | ||
904 | switch (state) { | |
905 | case ODEBUG_STATE_ACTIVE: | |
906 | debug_object_deactivate(obj, &descr_type_test); | |
907 | debug_object_destroy(obj, &descr_type_test); | |
b1e4d9d8 | 908 | return true; |
3ac7fe5a | 909 | default: |
b1e4d9d8 | 910 | return false; |
3ac7fe5a TG |
911 | } |
912 | } | |
913 | ||
914 | /* | |
915 | * fixup_free is called when: | |
916 | * - an active object is freed | |
917 | */ | |
b1e4d9d8 | 918 | static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
919 | { |
920 | struct self_test *obj = addr; | |
921 | ||
922 | switch (state) { | |
923 | case ODEBUG_STATE_ACTIVE: | |
924 | debug_object_deactivate(obj, &descr_type_test); | |
925 | debug_object_free(obj, &descr_type_test); | |
b1e4d9d8 | 926 | return true; |
3ac7fe5a | 927 | default: |
b1e4d9d8 | 928 | return false; |
3ac7fe5a TG |
929 | } |
930 | } | |
931 | ||
1fb2f77c | 932 | static int __init |
3ac7fe5a TG |
933 | check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) |
934 | { | |
935 | struct debug_bucket *db; | |
936 | struct debug_obj *obj; | |
937 | unsigned long flags; | |
938 | int res = -EINVAL; | |
939 | ||
940 | db = get_bucket((unsigned long) addr); | |
941 | ||
aef9cb05 | 942 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
943 | |
944 | obj = lookup_object(addr, db); | |
945 | if (!obj && state != ODEBUG_STATE_NONE) { | |
5cd2b459 | 946 | WARN(1, KERN_ERR "ODEBUG: selftest object not found\n"); |
3ac7fe5a TG |
947 | goto out; |
948 | } | |
949 | if (obj && obj->state != state) { | |
5cd2b459 | 950 | WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n", |
3ac7fe5a | 951 | obj->state, state); |
3ac7fe5a TG |
952 | goto out; |
953 | } | |
954 | if (fixups != debug_objects_fixups) { | |
5cd2b459 | 955 | WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n", |
3ac7fe5a | 956 | fixups, debug_objects_fixups); |
3ac7fe5a TG |
957 | goto out; |
958 | } | |
959 | if (warnings != debug_objects_warnings) { | |
5cd2b459 | 960 | WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n", |
3ac7fe5a | 961 | warnings, debug_objects_warnings); |
3ac7fe5a TG |
962 | goto out; |
963 | } | |
964 | res = 0; | |
965 | out: | |
aef9cb05 | 966 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
967 | if (res) |
968 | debug_objects_enabled = 0; | |
969 | return res; | |
970 | } | |
971 | ||
972 | static __initdata struct debug_obj_descr descr_type_test = { | |
973 | .name = "selftest", | |
b9fdac7f | 974 | .is_static_object = is_static_object, |
3ac7fe5a TG |
975 | .fixup_init = fixup_init, |
976 | .fixup_activate = fixup_activate, | |
977 | .fixup_destroy = fixup_destroy, | |
978 | .fixup_free = fixup_free, | |
979 | }; | |
980 | ||
981 | static __initdata struct self_test obj = { .static_init = 0 }; | |
982 | ||
983 | static void __init debug_objects_selftest(void) | |
984 | { | |
985 | int fixups, oldfixups, warnings, oldwarnings; | |
986 | unsigned long flags; | |
987 | ||
988 | local_irq_save(flags); | |
989 | ||
990 | fixups = oldfixups = debug_objects_fixups; | |
991 | warnings = oldwarnings = debug_objects_warnings; | |
992 | descr_test = &descr_type_test; | |
993 | ||
994 | debug_object_init(&obj, &descr_type_test); | |
995 | if (check_results(&obj, ODEBUG_STATE_INIT, 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_activate(&obj, &descr_type_test); | |
1001 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) | |
1002 | goto out; | |
1003 | debug_object_deactivate(&obj, &descr_type_test); | |
1004 | if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) | |
1005 | goto out; | |
1006 | debug_object_destroy(&obj, &descr_type_test); | |
1007 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) | |
1008 | goto out; | |
1009 | debug_object_init(&obj, &descr_type_test); | |
1010 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1011 | goto out; | |
1012 | debug_object_activate(&obj, &descr_type_test); | |
1013 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1014 | goto out; | |
1015 | debug_object_deactivate(&obj, &descr_type_test); | |
1016 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1017 | goto out; | |
1018 | debug_object_free(&obj, &descr_type_test); | |
1019 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1020 | goto out; | |
1021 | ||
1022 | obj.static_init = 1; | |
1023 | debug_object_activate(&obj, &descr_type_test); | |
9f78ff00 | 1024 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a TG |
1025 | goto out; |
1026 | debug_object_init(&obj, &descr_type_test); | |
1027 | if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) | |
1028 | goto out; | |
1029 | debug_object_free(&obj, &descr_type_test); | |
1030 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1031 | goto out; | |
1032 | ||
1033 | #ifdef CONFIG_DEBUG_OBJECTS_FREE | |
1034 | debug_object_init(&obj, &descr_type_test); | |
1035 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
1036 | goto out; | |
1037 | debug_object_activate(&obj, &descr_type_test); | |
1038 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
1039 | goto out; | |
1040 | __debug_check_no_obj_freed(&obj, sizeof(obj)); | |
1041 | if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) | |
1042 | goto out; | |
1043 | #endif | |
719e4843 | 1044 | pr_info("selftest passed\n"); |
3ac7fe5a TG |
1045 | |
1046 | out: | |
1047 | debug_objects_fixups = oldfixups; | |
1048 | debug_objects_warnings = oldwarnings; | |
1049 | descr_test = NULL; | |
1050 | ||
1051 | local_irq_restore(flags); | |
1052 | } | |
1053 | #else | |
1054 | static inline void debug_objects_selftest(void) { } | |
1055 | #endif | |
1056 | ||
1057 | /* | |
1058 | * Called during early boot to initialize the hash buckets and link | |
1059 | * the static object pool objects into the poll list. After this call | |
1060 | * the object tracker is fully operational. | |
1061 | */ | |
1062 | void __init debug_objects_early_init(void) | |
1063 | { | |
1064 | int i; | |
1065 | ||
1066 | for (i = 0; i < ODEBUG_HASH_SIZE; i++) | |
aef9cb05 | 1067 | raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a TG |
1068 | |
1069 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) | |
1070 | hlist_add_head(&obj_static_pool[i].node, &obj_pool); | |
1071 | } | |
1072 | ||
1be1cb7b TG |
1073 | /* |
1074 | * Convert the statically allocated objects to dynamic ones: | |
1075 | */ | |
1fb2f77c | 1076 | static int __init debug_objects_replace_static_objects(void) |
1be1cb7b TG |
1077 | { |
1078 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 1079 | struct hlist_node *tmp; |
1be1cb7b TG |
1080 | struct debug_obj *obj, *new; |
1081 | HLIST_HEAD(objects); | |
1082 | int i, cnt = 0; | |
1083 | ||
1084 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) { | |
1085 | obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); | |
1086 | if (!obj) | |
1087 | goto free; | |
caba4cbb | 1088 | kmemleak_ignore(obj); |
1be1cb7b TG |
1089 | hlist_add_head(&obj->node, &objects); |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * When debug_objects_mem_init() is called we know that only | |
1094 | * one CPU is up, so disabling interrupts is enough | |
1095 | * protection. This avoids the lockdep hell of lock ordering. | |
1096 | */ | |
1097 | local_irq_disable(); | |
1098 | ||
1099 | /* Remove the statically allocated objects from the pool */ | |
b67bfe0d | 1100 | hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b TG |
1101 | hlist_del(&obj->node); |
1102 | /* Move the allocated objects to the pool */ | |
1103 | hlist_move_list(&objects, &obj_pool); | |
1104 | ||
1105 | /* Replace the active object references */ | |
1106 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
1107 | hlist_move_list(&db->list, &objects); | |
1108 | ||
b67bfe0d | 1109 | hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b TG |
1110 | new = hlist_entry(obj_pool.first, typeof(*obj), node); |
1111 | hlist_del(&new->node); | |
1112 | /* copy object data */ | |
1113 | *new = *obj; | |
1114 | hlist_add_head(&new->node, &db->list); | |
1115 | cnt++; | |
1116 | } | |
1117 | } | |
765a5e0c | 1118 | local_irq_enable(); |
1be1cb7b | 1119 | |
c0f35cc0 FF |
1120 | pr_debug("%d of %d active objects replaced\n", |
1121 | cnt, obj_pool_used); | |
1be1cb7b TG |
1122 | return 0; |
1123 | free: | |
b67bfe0d | 1124 | hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b TG |
1125 | hlist_del(&obj->node); |
1126 | kmem_cache_free(obj_cache, obj); | |
1127 | } | |
1128 | return -ENOMEM; | |
1129 | } | |
1130 | ||
3ac7fe5a TG |
1131 | /* |
1132 | * Called after the kmem_caches are functional to setup a dedicated | |
1133 | * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag | |
1134 | * prevents that the debug code is called on kmem_cache_free() for the | |
1135 | * debug tracker objects to avoid recursive calls. | |
1136 | */ | |
1137 | void __init debug_objects_mem_init(void) | |
1138 | { | |
1139 | if (!debug_objects_enabled) | |
1140 | return; | |
1141 | ||
1142 | obj_cache = kmem_cache_create("debug_objects_cache", | |
1143 | sizeof (struct debug_obj), 0, | |
1144 | SLAB_DEBUG_OBJECTS, NULL); | |
1145 | ||
1be1cb7b | 1146 | if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a | 1147 | debug_objects_enabled = 0; |
1be1cb7b TG |
1148 | if (obj_cache) |
1149 | kmem_cache_destroy(obj_cache); | |
719e4843 | 1150 | pr_warn("out of memory.\n"); |
1be1cb7b | 1151 | } else |
3ac7fe5a | 1152 | debug_objects_selftest(); |
97dd552e WL |
1153 | |
1154 | /* | |
1155 | * Increase the thresholds for allocating and freeing objects | |
1156 | * according to the number of possible CPUs available in the system. | |
1157 | */ | |
1158 | debug_objects_pool_size += num_possible_cpus() * 32; | |
1159 | debug_objects_pool_min_level += num_possible_cpus() * 4; | |
3ac7fe5a | 1160 | } |