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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 | |
aef9cb05 | 114 | raw_spin_lock_irqsave(&pool_lock, flags); |
3ac7fe5a | 115 | hlist_add_head(&new->node, &obj_pool); |
0cad93c3 | 116 | debug_objects_allocated++; |
3ac7fe5a | 117 | obj_pool_free++; |
aef9cb05 | 118 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
3ac7fe5a | 119 | } |
3ac7fe5a TG |
120 | } |
121 | ||
122 | /* | |
123 | * Lookup an object in the hash bucket. | |
124 | */ | |
125 | static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b) | |
126 | { | |
3ac7fe5a TG |
127 | struct debug_obj *obj; |
128 | int cnt = 0; | |
129 | ||
b67bfe0d | 130 | hlist_for_each_entry(obj, &b->list, node) { |
3ac7fe5a TG |
131 | cnt++; |
132 | if (obj->object == addr) | |
133 | return obj; | |
134 | } | |
135 | if (cnt > debug_objects_maxchain) | |
136 | debug_objects_maxchain = cnt; | |
137 | ||
138 | return NULL; | |
139 | } | |
140 | ||
141 | /* | |
50db04dd | 142 | * Allocate a new object. If the pool is empty, switch off the debugger. |
673d62cc | 143 | * Must be called with interrupts disabled. |
3ac7fe5a TG |
144 | */ |
145 | static struct debug_obj * | |
146 | alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr) | |
147 | { | |
148 | struct debug_obj *obj = NULL; | |
3ac7fe5a | 149 | |
aef9cb05 | 150 | raw_spin_lock(&pool_lock); |
3ac7fe5a TG |
151 | if (obj_pool.first) { |
152 | obj = hlist_entry(obj_pool.first, typeof(*obj), node); | |
153 | ||
154 | obj->object = addr; | |
155 | obj->descr = descr; | |
156 | obj->state = ODEBUG_STATE_NONE; | |
a5d8e467 | 157 | obj->astate = 0; |
3ac7fe5a TG |
158 | hlist_del(&obj->node); |
159 | ||
160 | hlist_add_head(&obj->node, &b->list); | |
161 | ||
162 | obj_pool_used++; | |
163 | if (obj_pool_used > obj_pool_max_used) | |
164 | obj_pool_max_used = obj_pool_used; | |
165 | ||
166 | obj_pool_free--; | |
167 | if (obj_pool_free < obj_pool_min_free) | |
168 | obj_pool_min_free = obj_pool_free; | |
169 | } | |
aef9cb05 | 170 | raw_spin_unlock(&pool_lock); |
3ac7fe5a | 171 | |
3ac7fe5a TG |
172 | return obj; |
173 | } | |
174 | ||
175 | /* | |
337fff8b | 176 | * workqueue function to free objects. |
858274b6 WL |
177 | * |
178 | * To reduce contention on the global pool_lock, the actual freeing of | |
179 | * debug objects will be delayed if the pool_lock is busy. We also free | |
180 | * the objects in a batch of 4 for each lock/unlock cycle. | |
3ac7fe5a | 181 | */ |
858274b6 WL |
182 | #define ODEBUG_FREE_BATCH 4 |
183 | ||
337fff8b | 184 | static void free_obj_work(struct work_struct *work) |
3ac7fe5a | 185 | { |
858274b6 | 186 | struct debug_obj *objs[ODEBUG_FREE_BATCH]; |
673d62cc | 187 | unsigned long flags; |
858274b6 | 188 | int i; |
3ac7fe5a | 189 | |
858274b6 WL |
190 | if (!raw_spin_trylock_irqsave(&pool_lock, flags)) |
191 | return; | |
192 | while (obj_pool_free >= debug_objects_pool_size + ODEBUG_FREE_BATCH) { | |
193 | for (i = 0; i < ODEBUG_FREE_BATCH; i++) { | |
194 | objs[i] = hlist_entry(obj_pool.first, | |
195 | typeof(*objs[0]), node); | |
196 | hlist_del(&objs[i]->node); | |
197 | } | |
198 | ||
199 | obj_pool_free -= ODEBUG_FREE_BATCH; | |
200 | debug_objects_freed += ODEBUG_FREE_BATCH; | |
337fff8b TG |
201 | /* |
202 | * We release pool_lock across kmem_cache_free() to | |
203 | * avoid contention on pool_lock. | |
204 | */ | |
aef9cb05 | 205 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
858274b6 WL |
206 | for (i = 0; i < ODEBUG_FREE_BATCH; i++) |
207 | kmem_cache_free(obj_cache, objs[i]); | |
208 | if (!raw_spin_trylock_irqsave(&pool_lock, flags)) | |
209 | return; | |
3ac7fe5a | 210 | } |
aef9cb05 | 211 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
337fff8b TG |
212 | } |
213 | ||
214 | /* | |
215 | * Put the object back into the pool and schedule work to free objects | |
216 | * if necessary. | |
217 | */ | |
218 | static void free_object(struct debug_obj *obj) | |
219 | { | |
220 | unsigned long flags; | |
221 | int sched = 0; | |
222 | ||
aef9cb05 | 223 | raw_spin_lock_irqsave(&pool_lock, flags); |
337fff8b TG |
224 | /* |
225 | * schedule work when the pool is filled and the cache is | |
226 | * initialized: | |
227 | */ | |
97dd552e | 228 | if (obj_pool_free > debug_objects_pool_size && obj_cache) |
7092dff2 | 229 | sched = 1; |
337fff8b TG |
230 | hlist_add_head(&obj->node, &obj_pool); |
231 | obj_pool_free++; | |
232 | obj_pool_used--; | |
aef9cb05 | 233 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
337fff8b TG |
234 | if (sched) |
235 | schedule_work(&debug_obj_work); | |
3ac7fe5a TG |
236 | } |
237 | ||
238 | /* | |
239 | * We run out of memory. That means we probably have tons of objects | |
240 | * allocated. | |
241 | */ | |
242 | static void debug_objects_oom(void) | |
243 | { | |
244 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 245 | struct hlist_node *tmp; |
673d62cc | 246 | HLIST_HEAD(freelist); |
3ac7fe5a TG |
247 | struct debug_obj *obj; |
248 | unsigned long flags; | |
249 | int i; | |
250 | ||
719e4843 | 251 | pr_warn("Out of memory. ODEBUG disabled\n"); |
3ac7fe5a TG |
252 | |
253 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
aef9cb05 | 254 | raw_spin_lock_irqsave(&db->lock, flags); |
673d62cc | 255 | hlist_move_list(&db->list, &freelist); |
aef9cb05 | 256 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc VN |
257 | |
258 | /* Now free them */ | |
b67bfe0d | 259 | hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
3ac7fe5a TG |
260 | hlist_del(&obj->node); |
261 | free_object(obj); | |
262 | } | |
3ac7fe5a TG |
263 | } |
264 | } | |
265 | ||
266 | /* | |
267 | * We use the pfn of the address for the hash. That way we can check | |
268 | * for freed objects simply by checking the affected bucket. | |
269 | */ | |
270 | static struct debug_bucket *get_bucket(unsigned long addr) | |
271 | { | |
272 | unsigned long hash; | |
273 | ||
274 | hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS); | |
275 | return &obj_hash[hash]; | |
276 | } | |
277 | ||
278 | static void debug_print_object(struct debug_obj *obj, char *msg) | |
279 | { | |
99777288 | 280 | struct debug_obj_descr *descr = obj->descr; |
3ac7fe5a TG |
281 | static int limit; |
282 | ||
99777288 SG |
283 | if (limit < 5 && descr != descr_test) { |
284 | void *hint = descr->debug_hint ? | |
285 | descr->debug_hint(obj->object) : NULL; | |
3ac7fe5a | 286 | limit++; |
a5d8e467 | 287 | WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " |
99777288 | 288 | "object type: %s hint: %pS\n", |
a5d8e467 | 289 | msg, obj_states[obj->state], obj->astate, |
99777288 | 290 | descr->name, hint); |
3ac7fe5a TG |
291 | } |
292 | debug_objects_warnings++; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Try to repair the damage, so we have a better chance to get useful | |
297 | * debug output. | |
298 | */ | |
b1e4d9d8 DC |
299 | static bool |
300 | debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state), | |
3ac7fe5a TG |
301 | void * addr, enum debug_obj_state state) |
302 | { | |
b1e4d9d8 DC |
303 | if (fixup && fixup(addr, state)) { |
304 | debug_objects_fixups++; | |
305 | return true; | |
306 | } | |
307 | return false; | |
3ac7fe5a TG |
308 | } |
309 | ||
310 | static void debug_object_is_on_stack(void *addr, int onstack) | |
311 | { | |
3ac7fe5a TG |
312 | int is_on_stack; |
313 | static int limit; | |
314 | ||
315 | if (limit > 4) | |
316 | return; | |
317 | ||
8b05c7e6 | 318 | is_on_stack = object_is_on_stack(addr); |
3ac7fe5a TG |
319 | if (is_on_stack == onstack) |
320 | return; | |
321 | ||
322 | limit++; | |
323 | if (is_on_stack) | |
f9c10413 JFG |
324 | pr_warn("object %p is on stack %p, but NOT annotated.\n", addr, |
325 | task_stack_page(current)); | |
3ac7fe5a | 326 | else |
f9c10413 JFG |
327 | pr_warn("object %p is NOT on stack %p, but annotated.\n", addr, |
328 | task_stack_page(current)); | |
329 | ||
3ac7fe5a TG |
330 | WARN_ON(1); |
331 | } | |
332 | ||
333 | static void | |
334 | __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) | |
335 | { | |
336 | enum debug_obj_state state; | |
337 | struct debug_bucket *db; | |
338 | struct debug_obj *obj; | |
339 | unsigned long flags; | |
340 | ||
50db04dd VN |
341 | fill_pool(); |
342 | ||
3ac7fe5a TG |
343 | db = get_bucket((unsigned long) addr); |
344 | ||
aef9cb05 | 345 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
346 | |
347 | obj = lookup_object(addr, db); | |
348 | if (!obj) { | |
349 | obj = alloc_object(addr, db, descr); | |
350 | if (!obj) { | |
351 | debug_objects_enabled = 0; | |
aef9cb05 | 352 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
353 | debug_objects_oom(); |
354 | return; | |
355 | } | |
356 | debug_object_is_on_stack(addr, onstack); | |
357 | } | |
358 | ||
359 | switch (obj->state) { | |
360 | case ODEBUG_STATE_NONE: | |
361 | case ODEBUG_STATE_INIT: | |
362 | case ODEBUG_STATE_INACTIVE: | |
363 | obj->state = ODEBUG_STATE_INIT; | |
364 | break; | |
365 | ||
366 | case ODEBUG_STATE_ACTIVE: | |
367 | debug_print_object(obj, "init"); | |
368 | state = obj->state; | |
aef9cb05 | 369 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
370 | debug_object_fixup(descr->fixup_init, addr, state); |
371 | return; | |
372 | ||
373 | case ODEBUG_STATE_DESTROYED: | |
374 | debug_print_object(obj, "init"); | |
375 | break; | |
376 | default: | |
377 | break; | |
378 | } | |
379 | ||
aef9cb05 | 380 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
381 | } |
382 | ||
383 | /** | |
384 | * debug_object_init - debug checks when an object is initialized | |
385 | * @addr: address of the object | |
386 | * @descr: pointer to an object specific debug description structure | |
387 | */ | |
388 | void debug_object_init(void *addr, struct debug_obj_descr *descr) | |
389 | { | |
390 | if (!debug_objects_enabled) | |
391 | return; | |
392 | ||
393 | __debug_object_init(addr, descr, 0); | |
394 | } | |
f8ff04e2 | 395 | EXPORT_SYMBOL_GPL(debug_object_init); |
3ac7fe5a TG |
396 | |
397 | /** | |
398 | * debug_object_init_on_stack - debug checks when an object on stack is | |
399 | * initialized | |
400 | * @addr: address of the object | |
401 | * @descr: pointer to an object specific debug description structure | |
402 | */ | |
403 | void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) | |
404 | { | |
405 | if (!debug_objects_enabled) | |
406 | return; | |
407 | ||
408 | __debug_object_init(addr, descr, 1); | |
409 | } | |
f8ff04e2 | 410 | EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
3ac7fe5a TG |
411 | |
412 | /** | |
413 | * debug_object_activate - debug checks when an object is activated | |
414 | * @addr: address of the object | |
415 | * @descr: pointer to an object specific debug description structure | |
b778ae25 | 416 | * Returns 0 for success, -EINVAL for check failed. |
3ac7fe5a | 417 | */ |
b778ae25 | 418 | int debug_object_activate(void *addr, struct debug_obj_descr *descr) |
3ac7fe5a TG |
419 | { |
420 | enum debug_obj_state state; | |
421 | struct debug_bucket *db; | |
422 | struct debug_obj *obj; | |
423 | unsigned long flags; | |
b778ae25 | 424 | int ret; |
feac18dd SB |
425 | struct debug_obj o = { .object = addr, |
426 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
427 | .descr = descr }; | |
3ac7fe5a TG |
428 | |
429 | if (!debug_objects_enabled) | |
b778ae25 | 430 | return 0; |
3ac7fe5a TG |
431 | |
432 | db = get_bucket((unsigned long) addr); | |
433 | ||
aef9cb05 | 434 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
435 | |
436 | obj = lookup_object(addr, db); | |
437 | if (obj) { | |
438 | switch (obj->state) { | |
439 | case ODEBUG_STATE_INIT: | |
440 | case ODEBUG_STATE_INACTIVE: | |
441 | obj->state = ODEBUG_STATE_ACTIVE; | |
b778ae25 | 442 | ret = 0; |
3ac7fe5a TG |
443 | break; |
444 | ||
445 | case ODEBUG_STATE_ACTIVE: | |
446 | debug_print_object(obj, "activate"); | |
447 | state = obj->state; | |
aef9cb05 | 448 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 449 | ret = debug_object_fixup(descr->fixup_activate, addr, state); |
e7a8e78b | 450 | return ret ? 0 : -EINVAL; |
3ac7fe5a TG |
451 | |
452 | case ODEBUG_STATE_DESTROYED: | |
453 | debug_print_object(obj, "activate"); | |
b778ae25 | 454 | ret = -EINVAL; |
3ac7fe5a TG |
455 | break; |
456 | default: | |
b778ae25 | 457 | ret = 0; |
3ac7fe5a TG |
458 | break; |
459 | } | |
aef9cb05 | 460 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 461 | return ret; |
3ac7fe5a TG |
462 | } |
463 | ||
aef9cb05 | 464 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 465 | /* |
b9fdac7f DC |
466 | * We are here when a static object is activated. We |
467 | * let the type specific code confirm whether this is | |
468 | * true or not. if true, we just make sure that the | |
469 | * static object is tracked in the object tracker. If | |
470 | * not, this must be a bug, so we try to fix it up. | |
3ac7fe5a | 471 | */ |
b9fdac7f DC |
472 | if (descr->is_static_object && descr->is_static_object(addr)) { |
473 | /* track this static object */ | |
474 | debug_object_init(addr, descr); | |
475 | debug_object_activate(addr, descr); | |
476 | } else { | |
feac18dd | 477 | debug_print_object(&o, "activate"); |
b9fdac7f DC |
478 | ret = debug_object_fixup(descr->fixup_activate, addr, |
479 | ODEBUG_STATE_NOTAVAILABLE); | |
480 | return ret ? 0 : -EINVAL; | |
b778ae25 PM |
481 | } |
482 | return 0; | |
3ac7fe5a | 483 | } |
f8ff04e2 | 484 | EXPORT_SYMBOL_GPL(debug_object_activate); |
3ac7fe5a TG |
485 | |
486 | /** | |
487 | * debug_object_deactivate - debug checks when an object is deactivated | |
488 | * @addr: address of the object | |
489 | * @descr: pointer to an object specific debug description structure | |
490 | */ | |
491 | void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) | |
492 | { | |
493 | struct debug_bucket *db; | |
494 | struct debug_obj *obj; | |
495 | unsigned long flags; | |
496 | ||
497 | if (!debug_objects_enabled) | |
498 | return; | |
499 | ||
500 | db = get_bucket((unsigned long) addr); | |
501 | ||
aef9cb05 | 502 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
503 | |
504 | obj = lookup_object(addr, db); | |
505 | if (obj) { | |
506 | switch (obj->state) { | |
507 | case ODEBUG_STATE_INIT: | |
508 | case ODEBUG_STATE_INACTIVE: | |
509 | case ODEBUG_STATE_ACTIVE: | |
a5d8e467 MD |
510 | if (!obj->astate) |
511 | obj->state = ODEBUG_STATE_INACTIVE; | |
512 | else | |
513 | debug_print_object(obj, "deactivate"); | |
3ac7fe5a TG |
514 | break; |
515 | ||
516 | case ODEBUG_STATE_DESTROYED: | |
517 | debug_print_object(obj, "deactivate"); | |
518 | break; | |
519 | default: | |
520 | break; | |
521 | } | |
522 | } else { | |
523 | struct debug_obj o = { .object = addr, | |
524 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
525 | .descr = descr }; | |
526 | ||
527 | debug_print_object(&o, "deactivate"); | |
528 | } | |
529 | ||
aef9cb05 | 530 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 531 | } |
f8ff04e2 | 532 | EXPORT_SYMBOL_GPL(debug_object_deactivate); |
3ac7fe5a TG |
533 | |
534 | /** | |
535 | * debug_object_destroy - debug checks when an object is destroyed | |
536 | * @addr: address of the object | |
537 | * @descr: pointer to an object specific debug description structure | |
538 | */ | |
539 | void debug_object_destroy(void *addr, struct debug_obj_descr *descr) | |
540 | { | |
541 | enum debug_obj_state state; | |
542 | struct debug_bucket *db; | |
543 | struct debug_obj *obj; | |
544 | unsigned long flags; | |
545 | ||
546 | if (!debug_objects_enabled) | |
547 | return; | |
548 | ||
549 | db = get_bucket((unsigned long) addr); | |
550 | ||
aef9cb05 | 551 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
552 | |
553 | obj = lookup_object(addr, db); | |
554 | if (!obj) | |
555 | goto out_unlock; | |
556 | ||
557 | switch (obj->state) { | |
558 | case ODEBUG_STATE_NONE: | |
559 | case ODEBUG_STATE_INIT: | |
560 | case ODEBUG_STATE_INACTIVE: | |
561 | obj->state = ODEBUG_STATE_DESTROYED; | |
562 | break; | |
563 | case ODEBUG_STATE_ACTIVE: | |
564 | debug_print_object(obj, "destroy"); | |
565 | state = obj->state; | |
aef9cb05 | 566 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
567 | debug_object_fixup(descr->fixup_destroy, addr, state); |
568 | return; | |
569 | ||
570 | case ODEBUG_STATE_DESTROYED: | |
571 | debug_print_object(obj, "destroy"); | |
572 | break; | |
573 | default: | |
574 | break; | |
575 | } | |
576 | out_unlock: | |
aef9cb05 | 577 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 578 | } |
f8ff04e2 | 579 | EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a TG |
580 | |
581 | /** | |
582 | * debug_object_free - debug checks when an object is freed | |
583 | * @addr: address of the object | |
584 | * @descr: pointer to an object specific debug description structure | |
585 | */ | |
586 | void debug_object_free(void *addr, struct debug_obj_descr *descr) | |
587 | { | |
588 | enum debug_obj_state state; | |
589 | struct debug_bucket *db; | |
590 | struct debug_obj *obj; | |
591 | unsigned long flags; | |
592 | ||
593 | if (!debug_objects_enabled) | |
594 | return; | |
595 | ||
596 | db = get_bucket((unsigned long) addr); | |
597 | ||
aef9cb05 | 598 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
599 | |
600 | obj = lookup_object(addr, db); | |
601 | if (!obj) | |
602 | goto out_unlock; | |
603 | ||
604 | switch (obj->state) { | |
605 | case ODEBUG_STATE_ACTIVE: | |
606 | debug_print_object(obj, "free"); | |
607 | state = obj->state; | |
aef9cb05 | 608 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
609 | debug_object_fixup(descr->fixup_free, addr, state); |
610 | return; | |
611 | default: | |
612 | hlist_del(&obj->node); | |
aef9cb05 | 613 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 614 | free_object(obj); |
673d62cc | 615 | return; |
3ac7fe5a TG |
616 | } |
617 | out_unlock: | |
aef9cb05 | 618 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 619 | } |
f8ff04e2 | 620 | EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a | 621 | |
b84d435c CC |
622 | /** |
623 | * debug_object_assert_init - debug checks when object should be init-ed | |
624 | * @addr: address of the object | |
625 | * @descr: pointer to an object specific debug description structure | |
626 | */ | |
627 | void debug_object_assert_init(void *addr, struct debug_obj_descr *descr) | |
628 | { | |
629 | struct debug_bucket *db; | |
630 | struct debug_obj *obj; | |
631 | unsigned long flags; | |
632 | ||
633 | if (!debug_objects_enabled) | |
634 | return; | |
635 | ||
636 | db = get_bucket((unsigned long) addr); | |
637 | ||
638 | raw_spin_lock_irqsave(&db->lock, flags); | |
639 | ||
640 | obj = lookup_object(addr, db); | |
641 | if (!obj) { | |
642 | struct debug_obj o = { .object = addr, | |
643 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
644 | .descr = descr }; | |
645 | ||
646 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
647 | /* | |
b9fdac7f DC |
648 | * Maybe the object is static, and we let the type specific |
649 | * code confirm. Track this static object if true, else invoke | |
650 | * fixup. | |
b84d435c | 651 | */ |
b9fdac7f DC |
652 | if (descr->is_static_object && descr->is_static_object(addr)) { |
653 | /* Track this static object */ | |
654 | debug_object_init(addr, descr); | |
655 | } else { | |
b84d435c | 656 | debug_print_object(&o, "assert_init"); |
b9fdac7f DC |
657 | debug_object_fixup(descr->fixup_assert_init, addr, |
658 | ODEBUG_STATE_NOTAVAILABLE); | |
659 | } | |
b84d435c CC |
660 | return; |
661 | } | |
662 | ||
663 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
664 | } | |
f8ff04e2 | 665 | EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435c | 666 | |
a5d8e467 MD |
667 | /** |
668 | * debug_object_active_state - debug checks object usage state machine | |
669 | * @addr: address of the object | |
670 | * @descr: pointer to an object specific debug description structure | |
671 | * @expect: expected state | |
672 | * @next: state to move to if expected state is found | |
673 | */ | |
674 | void | |
675 | debug_object_active_state(void *addr, struct debug_obj_descr *descr, | |
676 | unsigned int expect, unsigned int next) | |
677 | { | |
678 | struct debug_bucket *db; | |
679 | struct debug_obj *obj; | |
680 | unsigned long flags; | |
681 | ||
682 | if (!debug_objects_enabled) | |
683 | return; | |
684 | ||
685 | db = get_bucket((unsigned long) addr); | |
686 | ||
687 | raw_spin_lock_irqsave(&db->lock, flags); | |
688 | ||
689 | obj = lookup_object(addr, db); | |
690 | if (obj) { | |
691 | switch (obj->state) { | |
692 | case ODEBUG_STATE_ACTIVE: | |
693 | if (obj->astate == expect) | |
694 | obj->astate = next; | |
695 | else | |
696 | debug_print_object(obj, "active_state"); | |
697 | break; | |
698 | ||
699 | default: | |
700 | debug_print_object(obj, "active_state"); | |
701 | break; | |
702 | } | |
703 | } else { | |
704 | struct debug_obj o = { .object = addr, | |
705 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
706 | .descr = descr }; | |
707 | ||
708 | debug_print_object(&o, "active_state"); | |
709 | } | |
710 | ||
711 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
712 | } | |
f8ff04e2 | 713 | EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467 | 714 | |
3ac7fe5a TG |
715 | #ifdef CONFIG_DEBUG_OBJECTS_FREE |
716 | static void __debug_check_no_obj_freed(const void *address, unsigned long size) | |
717 | { | |
718 | unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; | |
b67bfe0d | 719 | struct hlist_node *tmp; |
673d62cc | 720 | HLIST_HEAD(freelist); |
3ac7fe5a TG |
721 | struct debug_obj_descr *descr; |
722 | enum debug_obj_state state; | |
723 | struct debug_bucket *db; | |
724 | struct debug_obj *obj; | |
725 | int cnt; | |
726 | ||
727 | saddr = (unsigned long) address; | |
728 | eaddr = saddr + size; | |
729 | paddr = saddr & ODEBUG_CHUNK_MASK; | |
730 | chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); | |
731 | chunks >>= ODEBUG_CHUNK_SHIFT; | |
732 | ||
733 | for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { | |
734 | db = get_bucket(paddr); | |
735 | ||
736 | repeat: | |
737 | cnt = 0; | |
aef9cb05 | 738 | raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d | 739 | hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a TG |
740 | cnt++; |
741 | oaddr = (unsigned long) obj->object; | |
742 | if (oaddr < saddr || oaddr >= eaddr) | |
743 | continue; | |
744 | ||
745 | switch (obj->state) { | |
746 | case ODEBUG_STATE_ACTIVE: | |
747 | debug_print_object(obj, "free"); | |
748 | descr = obj->descr; | |
749 | state = obj->state; | |
aef9cb05 | 750 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
751 | debug_object_fixup(descr->fixup_free, |
752 | (void *) oaddr, state); | |
753 | goto repeat; | |
754 | default: | |
755 | hlist_del(&obj->node); | |
673d62cc | 756 | hlist_add_head(&obj->node, &freelist); |
3ac7fe5a TG |
757 | break; |
758 | } | |
759 | } | |
aef9cb05 | 760 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc VN |
761 | |
762 | /* Now free them */ | |
b67bfe0d | 763 | hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
673d62cc VN |
764 | hlist_del(&obj->node); |
765 | free_object(obj); | |
766 | } | |
767 | ||
3ac7fe5a TG |
768 | if (cnt > debug_objects_maxchain) |
769 | debug_objects_maxchain = cnt; | |
770 | } | |
771 | } | |
772 | ||
773 | void debug_check_no_obj_freed(const void *address, unsigned long size) | |
774 | { | |
775 | if (debug_objects_enabled) | |
776 | __debug_check_no_obj_freed(address, size); | |
777 | } | |
778 | #endif | |
779 | ||
780 | #ifdef CONFIG_DEBUG_FS | |
781 | ||
782 | static int debug_stats_show(struct seq_file *m, void *v) | |
783 | { | |
784 | seq_printf(m, "max_chain :%d\n", debug_objects_maxchain); | |
785 | seq_printf(m, "warnings :%d\n", debug_objects_warnings); | |
786 | seq_printf(m, "fixups :%d\n", debug_objects_fixups); | |
787 | seq_printf(m, "pool_free :%d\n", obj_pool_free); | |
788 | seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free); | |
789 | seq_printf(m, "pool_used :%d\n", obj_pool_used); | |
790 | seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used); | |
0cad93c3 WL |
791 | seq_printf(m, "objs_allocated:%d\n", debug_objects_allocated); |
792 | seq_printf(m, "objs_freed :%d\n", debug_objects_freed); | |
3ac7fe5a TG |
793 | return 0; |
794 | } | |
795 | ||
796 | static int debug_stats_open(struct inode *inode, struct file *filp) | |
797 | { | |
798 | return single_open(filp, debug_stats_show, NULL); | |
799 | } | |
800 | ||
801 | static const struct file_operations debug_stats_fops = { | |
802 | .open = debug_stats_open, | |
803 | .read = seq_read, | |
804 | .llseek = seq_lseek, | |
805 | .release = single_release, | |
806 | }; | |
807 | ||
808 | static int __init debug_objects_init_debugfs(void) | |
809 | { | |
810 | struct dentry *dbgdir, *dbgstats; | |
811 | ||
812 | if (!debug_objects_enabled) | |
813 | return 0; | |
814 | ||
815 | dbgdir = debugfs_create_dir("debug_objects", NULL); | |
816 | if (!dbgdir) | |
817 | return -ENOMEM; | |
818 | ||
819 | dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL, | |
820 | &debug_stats_fops); | |
821 | if (!dbgstats) | |
822 | goto err; | |
823 | ||
824 | return 0; | |
825 | ||
826 | err: | |
827 | debugfs_remove(dbgdir); | |
828 | ||
829 | return -ENOMEM; | |
830 | } | |
831 | __initcall(debug_objects_init_debugfs); | |
832 | ||
833 | #else | |
834 | static inline void debug_objects_init_debugfs(void) { } | |
835 | #endif | |
836 | ||
837 | #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST | |
838 | ||
839 | /* Random data structure for the self test */ | |
840 | struct self_test { | |
841 | unsigned long dummy1[6]; | |
842 | int static_init; | |
843 | unsigned long dummy2[3]; | |
844 | }; | |
845 | ||
846 | static __initdata struct debug_obj_descr descr_type_test; | |
847 | ||
b9fdac7f DC |
848 | static bool __init is_static_object(void *addr) |
849 | { | |
850 | struct self_test *obj = addr; | |
851 | ||
852 | return obj->static_init; | |
853 | } | |
854 | ||
3ac7fe5a TG |
855 | /* |
856 | * fixup_init is called when: | |
857 | * - an active object is initialized | |
858 | */ | |
b1e4d9d8 | 859 | static bool __init fixup_init(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
860 | { |
861 | struct self_test *obj = addr; | |
862 | ||
863 | switch (state) { | |
864 | case ODEBUG_STATE_ACTIVE: | |
865 | debug_object_deactivate(obj, &descr_type_test); | |
866 | debug_object_init(obj, &descr_type_test); | |
b1e4d9d8 | 867 | return true; |
3ac7fe5a | 868 | default: |
b1e4d9d8 | 869 | return false; |
3ac7fe5a TG |
870 | } |
871 | } | |
872 | ||
873 | /* | |
874 | * fixup_activate is called when: | |
875 | * - an active object is activated | |
b9fdac7f | 876 | * - an unknown non-static object is activated |
3ac7fe5a | 877 | */ |
b1e4d9d8 | 878 | static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
879 | { |
880 | struct self_test *obj = addr; | |
881 | ||
882 | switch (state) { | |
883 | case ODEBUG_STATE_NOTAVAILABLE: | |
b1e4d9d8 | 884 | return true; |
3ac7fe5a TG |
885 | case ODEBUG_STATE_ACTIVE: |
886 | debug_object_deactivate(obj, &descr_type_test); | |
887 | debug_object_activate(obj, &descr_type_test); | |
b1e4d9d8 | 888 | return true; |
3ac7fe5a TG |
889 | |
890 | default: | |
b1e4d9d8 | 891 | return false; |
3ac7fe5a TG |
892 | } |
893 | } | |
894 | ||
895 | /* | |
896 | * fixup_destroy is called when: | |
897 | * - an active object is destroyed | |
898 | */ | |
b1e4d9d8 | 899 | static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
900 | { |
901 | struct self_test *obj = addr; | |
902 | ||
903 | switch (state) { | |
904 | case ODEBUG_STATE_ACTIVE: | |
905 | debug_object_deactivate(obj, &descr_type_test); | |
906 | debug_object_destroy(obj, &descr_type_test); | |
b1e4d9d8 | 907 | return true; |
3ac7fe5a | 908 | default: |
b1e4d9d8 | 909 | return false; |
3ac7fe5a TG |
910 | } |
911 | } | |
912 | ||
913 | /* | |
914 | * fixup_free is called when: | |
915 | * - an active object is freed | |
916 | */ | |
b1e4d9d8 | 917 | static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
918 | { |
919 | struct self_test *obj = addr; | |
920 | ||
921 | switch (state) { | |
922 | case ODEBUG_STATE_ACTIVE: | |
923 | debug_object_deactivate(obj, &descr_type_test); | |
924 | debug_object_free(obj, &descr_type_test); | |
b1e4d9d8 | 925 | return true; |
3ac7fe5a | 926 | default: |
b1e4d9d8 | 927 | return false; |
3ac7fe5a TG |
928 | } |
929 | } | |
930 | ||
1fb2f77c | 931 | static int __init |
3ac7fe5a TG |
932 | check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) |
933 | { | |
934 | struct debug_bucket *db; | |
935 | struct debug_obj *obj; | |
936 | unsigned long flags; | |
937 | int res = -EINVAL; | |
938 | ||
939 | db = get_bucket((unsigned long) addr); | |
940 | ||
aef9cb05 | 941 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
942 | |
943 | obj = lookup_object(addr, db); | |
944 | if (!obj && state != ODEBUG_STATE_NONE) { | |
5cd2b459 | 945 | WARN(1, KERN_ERR "ODEBUG: selftest object not found\n"); |
3ac7fe5a TG |
946 | goto out; |
947 | } | |
948 | if (obj && obj->state != state) { | |
5cd2b459 | 949 | WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n", |
3ac7fe5a | 950 | obj->state, state); |
3ac7fe5a TG |
951 | goto out; |
952 | } | |
953 | if (fixups != debug_objects_fixups) { | |
5cd2b459 | 954 | WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n", |
3ac7fe5a | 955 | fixups, debug_objects_fixups); |
3ac7fe5a TG |
956 | goto out; |
957 | } | |
958 | if (warnings != debug_objects_warnings) { | |
5cd2b459 | 959 | WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n", |
3ac7fe5a | 960 | warnings, debug_objects_warnings); |
3ac7fe5a TG |
961 | goto out; |
962 | } | |
963 | res = 0; | |
964 | out: | |
aef9cb05 | 965 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
966 | if (res) |
967 | debug_objects_enabled = 0; | |
968 | return res; | |
969 | } | |
970 | ||
971 | static __initdata struct debug_obj_descr descr_type_test = { | |
972 | .name = "selftest", | |
b9fdac7f | 973 | .is_static_object = is_static_object, |
3ac7fe5a TG |
974 | .fixup_init = fixup_init, |
975 | .fixup_activate = fixup_activate, | |
976 | .fixup_destroy = fixup_destroy, | |
977 | .fixup_free = fixup_free, | |
978 | }; | |
979 | ||
980 | static __initdata struct self_test obj = { .static_init = 0 }; | |
981 | ||
982 | static void __init debug_objects_selftest(void) | |
983 | { | |
984 | int fixups, oldfixups, warnings, oldwarnings; | |
985 | unsigned long flags; | |
986 | ||
987 | local_irq_save(flags); | |
988 | ||
989 | fixups = oldfixups = debug_objects_fixups; | |
990 | warnings = oldwarnings = debug_objects_warnings; | |
991 | descr_test = &descr_type_test; | |
992 | ||
993 | debug_object_init(&obj, &descr_type_test); | |
994 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
995 | goto out; | |
996 | debug_object_activate(&obj, &descr_type_test); | |
997 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
998 | goto out; | |
999 | debug_object_activate(&obj, &descr_type_test); | |
1000 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) | |
1001 | goto out; | |
1002 | debug_object_deactivate(&obj, &descr_type_test); | |
1003 | if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) | |
1004 | goto out; | |
1005 | debug_object_destroy(&obj, &descr_type_test); | |
1006 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) | |
1007 | goto out; | |
1008 | debug_object_init(&obj, &descr_type_test); | |
1009 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1010 | goto out; | |
1011 | debug_object_activate(&obj, &descr_type_test); | |
1012 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1013 | goto out; | |
1014 | debug_object_deactivate(&obj, &descr_type_test); | |
1015 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1016 | goto out; | |
1017 | debug_object_free(&obj, &descr_type_test); | |
1018 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1019 | goto out; | |
1020 | ||
1021 | obj.static_init = 1; | |
1022 | debug_object_activate(&obj, &descr_type_test); | |
9f78ff00 | 1023 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a TG |
1024 | goto out; |
1025 | debug_object_init(&obj, &descr_type_test); | |
1026 | if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) | |
1027 | goto out; | |
1028 | debug_object_free(&obj, &descr_type_test); | |
1029 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1030 | goto out; | |
1031 | ||
1032 | #ifdef CONFIG_DEBUG_OBJECTS_FREE | |
1033 | debug_object_init(&obj, &descr_type_test); | |
1034 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
1035 | goto out; | |
1036 | debug_object_activate(&obj, &descr_type_test); | |
1037 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
1038 | goto out; | |
1039 | __debug_check_no_obj_freed(&obj, sizeof(obj)); | |
1040 | if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) | |
1041 | goto out; | |
1042 | #endif | |
719e4843 | 1043 | pr_info("selftest passed\n"); |
3ac7fe5a TG |
1044 | |
1045 | out: | |
1046 | debug_objects_fixups = oldfixups; | |
1047 | debug_objects_warnings = oldwarnings; | |
1048 | descr_test = NULL; | |
1049 | ||
1050 | local_irq_restore(flags); | |
1051 | } | |
1052 | #else | |
1053 | static inline void debug_objects_selftest(void) { } | |
1054 | #endif | |
1055 | ||
1056 | /* | |
1057 | * Called during early boot to initialize the hash buckets and link | |
1058 | * the static object pool objects into the poll list. After this call | |
1059 | * the object tracker is fully operational. | |
1060 | */ | |
1061 | void __init debug_objects_early_init(void) | |
1062 | { | |
1063 | int i; | |
1064 | ||
1065 | for (i = 0; i < ODEBUG_HASH_SIZE; i++) | |
aef9cb05 | 1066 | raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a TG |
1067 | |
1068 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) | |
1069 | hlist_add_head(&obj_static_pool[i].node, &obj_pool); | |
1070 | } | |
1071 | ||
1be1cb7b TG |
1072 | /* |
1073 | * Convert the statically allocated objects to dynamic ones: | |
1074 | */ | |
1fb2f77c | 1075 | static int __init debug_objects_replace_static_objects(void) |
1be1cb7b TG |
1076 | { |
1077 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 1078 | struct hlist_node *tmp; |
1be1cb7b TG |
1079 | struct debug_obj *obj, *new; |
1080 | HLIST_HEAD(objects); | |
1081 | int i, cnt = 0; | |
1082 | ||
1083 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) { | |
1084 | obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); | |
1085 | if (!obj) | |
1086 | goto free; | |
1087 | hlist_add_head(&obj->node, &objects); | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * When debug_objects_mem_init() is called we know that only | |
1092 | * one CPU is up, so disabling interrupts is enough | |
1093 | * protection. This avoids the lockdep hell of lock ordering. | |
1094 | */ | |
1095 | local_irq_disable(); | |
1096 | ||
1097 | /* Remove the statically allocated objects from the pool */ | |
b67bfe0d | 1098 | hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b TG |
1099 | hlist_del(&obj->node); |
1100 | /* Move the allocated objects to the pool */ | |
1101 | hlist_move_list(&objects, &obj_pool); | |
1102 | ||
1103 | /* Replace the active object references */ | |
1104 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
1105 | hlist_move_list(&db->list, &objects); | |
1106 | ||
b67bfe0d | 1107 | hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b TG |
1108 | new = hlist_entry(obj_pool.first, typeof(*obj), node); |
1109 | hlist_del(&new->node); | |
1110 | /* copy object data */ | |
1111 | *new = *obj; | |
1112 | hlist_add_head(&new->node, &db->list); | |
1113 | cnt++; | |
1114 | } | |
1115 | } | |
765a5e0c | 1116 | local_irq_enable(); |
1be1cb7b | 1117 | |
c0f35cc0 FF |
1118 | pr_debug("%d of %d active objects replaced\n", |
1119 | cnt, obj_pool_used); | |
1be1cb7b TG |
1120 | return 0; |
1121 | free: | |
b67bfe0d | 1122 | hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b TG |
1123 | hlist_del(&obj->node); |
1124 | kmem_cache_free(obj_cache, obj); | |
1125 | } | |
1126 | return -ENOMEM; | |
1127 | } | |
1128 | ||
3ac7fe5a TG |
1129 | /* |
1130 | * Called after the kmem_caches are functional to setup a dedicated | |
1131 | * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag | |
1132 | * prevents that the debug code is called on kmem_cache_free() for the | |
1133 | * debug tracker objects to avoid recursive calls. | |
1134 | */ | |
1135 | void __init debug_objects_mem_init(void) | |
1136 | { | |
1137 | if (!debug_objects_enabled) | |
1138 | return; | |
1139 | ||
1140 | obj_cache = kmem_cache_create("debug_objects_cache", | |
1141 | sizeof (struct debug_obj), 0, | |
6d765543 QC |
1142 | SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE, |
1143 | NULL); | |
3ac7fe5a | 1144 | |
1be1cb7b | 1145 | if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a | 1146 | debug_objects_enabled = 0; |
1be1cb7b TG |
1147 | if (obj_cache) |
1148 | kmem_cache_destroy(obj_cache); | |
719e4843 | 1149 | pr_warn("out of memory.\n"); |
1be1cb7b | 1150 | } else |
3ac7fe5a | 1151 | debug_objects_selftest(); |
97dd552e WL |
1152 | |
1153 | /* | |
1154 | * Increase the thresholds for allocating and freeing objects | |
1155 | * according to the number of possible CPUs available in the system. | |
1156 | */ | |
1157 | debug_objects_pool_size += num_possible_cpus() * 32; | |
1158 | debug_objects_pool_min_level += num_possible_cpus() * 4; | |
3ac7fe5a | 1159 | } |