Commit | Line | Data |
---|---|---|
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); | |
36c4ead6 | 45 | static HLIST_HEAD(obj_to_free); |
3ac7fe5a TG |
46 | |
47 | static int obj_pool_min_free = ODEBUG_POOL_SIZE; | |
48 | static int obj_pool_free = ODEBUG_POOL_SIZE; | |
49 | static int obj_pool_used; | |
50 | static int obj_pool_max_used; | |
36c4ead6 YS |
51 | /* The number of objs on the global free list */ |
52 | static int obj_nr_tofree; | |
3ac7fe5a TG |
53 | static struct kmem_cache *obj_cache; |
54 | ||
55 | static int debug_objects_maxchain __read_mostly; | |
163cf842 | 56 | static int __maybe_unused debug_objects_maxchecked __read_mostly; |
3ac7fe5a TG |
57 | static int debug_objects_fixups __read_mostly; |
58 | static int debug_objects_warnings __read_mostly; | |
3ae70205 IM |
59 | static int debug_objects_enabled __read_mostly |
60 | = CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT; | |
97dd552e WL |
61 | static int debug_objects_pool_size __read_mostly |
62 | = ODEBUG_POOL_SIZE; | |
63 | static int debug_objects_pool_min_level __read_mostly | |
64 | = ODEBUG_POOL_MIN_LEVEL; | |
3ac7fe5a TG |
65 | static struct debug_obj_descr *descr_test __read_mostly; |
66 | ||
c4b73aab | 67 | /* |
0cad93c3 | 68 | * Track numbers of kmem_cache_alloc()/free() calls done. |
c4b73aab | 69 | */ |
0cad93c3 | 70 | static int debug_objects_allocated; |
c4b73aab WL |
71 | static int debug_objects_freed; |
72 | ||
337fff8b TG |
73 | static void free_obj_work(struct work_struct *work); |
74 | static DECLARE_WORK(debug_obj_work, free_obj_work); | |
75 | ||
3ac7fe5a TG |
76 | static int __init enable_object_debug(char *str) |
77 | { | |
78 | debug_objects_enabled = 1; | |
79 | return 0; | |
80 | } | |
3e8ebb5c KM |
81 | |
82 | static int __init disable_object_debug(char *str) | |
83 | { | |
84 | debug_objects_enabled = 0; | |
85 | return 0; | |
86 | } | |
87 | ||
3ac7fe5a | 88 | early_param("debug_objects", enable_object_debug); |
3e8ebb5c | 89 | early_param("no_debug_objects", disable_object_debug); |
3ac7fe5a TG |
90 | |
91 | static const char *obj_states[ODEBUG_STATE_MAX] = { | |
92 | [ODEBUG_STATE_NONE] = "none", | |
93 | [ODEBUG_STATE_INIT] = "initialized", | |
94 | [ODEBUG_STATE_INACTIVE] = "inactive", | |
95 | [ODEBUG_STATE_ACTIVE] = "active", | |
96 | [ODEBUG_STATE_DESTROYED] = "destroyed", | |
97 | [ODEBUG_STATE_NOTAVAILABLE] = "not available", | |
98 | }; | |
99 | ||
1fda107d | 100 | static void fill_pool(void) |
3ac7fe5a TG |
101 | { |
102 | gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN; | |
36c4ead6 | 103 | struct debug_obj *new, *obj; |
50db04dd | 104 | unsigned long flags; |
3ac7fe5a | 105 | |
97dd552e | 106 | if (likely(obj_pool_free >= debug_objects_pool_min_level)) |
1fda107d | 107 | return; |
3ac7fe5a | 108 | |
36c4ead6 YS |
109 | /* |
110 | * Reuse objs from the global free list; they will be reinitialized | |
111 | * when allocating. | |
112 | */ | |
113 | while (obj_nr_tofree && (obj_pool_free < obj_pool_min_free)) { | |
114 | raw_spin_lock_irqsave(&pool_lock, flags); | |
115 | /* | |
116 | * Recheck with the lock held as the worker thread might have | |
117 | * won the race and freed the global free list already. | |
118 | */ | |
119 | if (obj_nr_tofree) { | |
120 | obj = hlist_entry(obj_to_free.first, typeof(*obj), node); | |
121 | hlist_del(&obj->node); | |
122 | obj_nr_tofree--; | |
123 | hlist_add_head(&obj->node, &obj_pool); | |
124 | obj_pool_free++; | |
125 | } | |
126 | raw_spin_unlock_irqrestore(&pool_lock, flags); | |
127 | } | |
128 | ||
3ac7fe5a | 129 | if (unlikely(!obj_cache)) |
1fda107d | 130 | return; |
3ac7fe5a | 131 | |
97dd552e | 132 | while (obj_pool_free < debug_objects_pool_min_level) { |
3ac7fe5a TG |
133 | |
134 | new = kmem_cache_zalloc(obj_cache, gfp); | |
135 | if (!new) | |
3340808c | 136 | return; |
3ac7fe5a | 137 | |
caba4cbb | 138 | kmemleak_ignore(new); |
aef9cb05 | 139 | raw_spin_lock_irqsave(&pool_lock, flags); |
3ac7fe5a | 140 | hlist_add_head(&new->node, &obj_pool); |
0cad93c3 | 141 | debug_objects_allocated++; |
3ac7fe5a | 142 | obj_pool_free++; |
aef9cb05 | 143 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
3ac7fe5a | 144 | } |
3ac7fe5a TG |
145 | } |
146 | ||
147 | /* | |
148 | * Lookup an object in the hash bucket. | |
149 | */ | |
150 | static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b) | |
151 | { | |
3ac7fe5a TG |
152 | struct debug_obj *obj; |
153 | int cnt = 0; | |
154 | ||
b67bfe0d | 155 | hlist_for_each_entry(obj, &b->list, node) { |
3ac7fe5a TG |
156 | cnt++; |
157 | if (obj->object == addr) | |
158 | return obj; | |
159 | } | |
160 | if (cnt > debug_objects_maxchain) | |
161 | debug_objects_maxchain = cnt; | |
162 | ||
163 | return NULL; | |
164 | } | |
165 | ||
166 | /* | |
50db04dd | 167 | * Allocate a new object. If the pool is empty, switch off the debugger. |
673d62cc | 168 | * Must be called with interrupts disabled. |
3ac7fe5a TG |
169 | */ |
170 | static struct debug_obj * | |
171 | alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr) | |
172 | { | |
173 | struct debug_obj *obj = NULL; | |
3ac7fe5a | 174 | |
aef9cb05 | 175 | raw_spin_lock(&pool_lock); |
3ac7fe5a TG |
176 | if (obj_pool.first) { |
177 | obj = hlist_entry(obj_pool.first, typeof(*obj), node); | |
178 | ||
179 | obj->object = addr; | |
180 | obj->descr = descr; | |
181 | obj->state = ODEBUG_STATE_NONE; | |
a5d8e467 | 182 | obj->astate = 0; |
3ac7fe5a TG |
183 | hlist_del(&obj->node); |
184 | ||
185 | hlist_add_head(&obj->node, &b->list); | |
186 | ||
187 | obj_pool_used++; | |
188 | if (obj_pool_used > obj_pool_max_used) | |
189 | obj_pool_max_used = obj_pool_used; | |
190 | ||
191 | obj_pool_free--; | |
192 | if (obj_pool_free < obj_pool_min_free) | |
193 | obj_pool_min_free = obj_pool_free; | |
194 | } | |
aef9cb05 | 195 | raw_spin_unlock(&pool_lock); |
3ac7fe5a | 196 | |
3ac7fe5a TG |
197 | return obj; |
198 | } | |
199 | ||
200 | /* | |
337fff8b | 201 | * workqueue function to free objects. |
858274b6 WL |
202 | * |
203 | * To reduce contention on the global pool_lock, the actual freeing of | |
636e1970 | 204 | * debug objects will be delayed if the pool_lock is busy. |
3ac7fe5a | 205 | */ |
337fff8b | 206 | static void free_obj_work(struct work_struct *work) |
3ac7fe5a | 207 | { |
36c4ead6 YS |
208 | struct hlist_node *tmp; |
209 | struct debug_obj *obj; | |
673d62cc | 210 | unsigned long flags; |
36c4ead6 | 211 | HLIST_HEAD(tofree); |
3ac7fe5a | 212 | |
858274b6 WL |
213 | if (!raw_spin_trylock_irqsave(&pool_lock, flags)) |
214 | return; | |
36c4ead6 YS |
215 | |
216 | /* | |
217 | * The objs on the pool list might be allocated before the work is | |
218 | * run, so recheck if pool list it full or not, if not fill pool | |
219 | * list from the global free list | |
220 | */ | |
221 | while (obj_nr_tofree && obj_pool_free < debug_objects_pool_size) { | |
222 | obj = hlist_entry(obj_to_free.first, typeof(*obj), node); | |
223 | hlist_del(&obj->node); | |
224 | hlist_add_head(&obj->node, &obj_pool); | |
225 | obj_pool_free++; | |
226 | obj_nr_tofree--; | |
227 | } | |
228 | ||
229 | /* | |
230 | * Pool list is already full and there are still objs on the free | |
231 | * list. Move remaining free objs to a temporary list to free the | |
232 | * memory outside the pool_lock held region. | |
233 | */ | |
234 | if (obj_nr_tofree) { | |
235 | hlist_move_list(&obj_to_free, &tofree); | |
04148187 | 236 | debug_objects_freed += obj_nr_tofree; |
36c4ead6 YS |
237 | obj_nr_tofree = 0; |
238 | } | |
aef9cb05 | 239 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
36c4ead6 YS |
240 | |
241 | hlist_for_each_entry_safe(obj, tmp, &tofree, node) { | |
242 | hlist_del(&obj->node); | |
243 | kmem_cache_free(obj_cache, obj); | |
244 | } | |
337fff8b TG |
245 | } |
246 | ||
636e1970 | 247 | static bool __free_object(struct debug_obj *obj) |
337fff8b TG |
248 | { |
249 | unsigned long flags; | |
636e1970 | 250 | bool work; |
337fff8b | 251 | |
aef9cb05 | 252 | raw_spin_lock_irqsave(&pool_lock, flags); |
636e1970 | 253 | work = (obj_pool_free > debug_objects_pool_size) && obj_cache; |
337fff8b | 254 | obj_pool_used--; |
636e1970 YS |
255 | |
256 | if (work) { | |
257 | obj_nr_tofree++; | |
258 | hlist_add_head(&obj->node, &obj_to_free); | |
259 | } else { | |
260 | obj_pool_free++; | |
261 | hlist_add_head(&obj->node, &obj_pool); | |
262 | } | |
aef9cb05 | 263 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
636e1970 YS |
264 | return work; |
265 | } | |
266 | ||
267 | /* | |
268 | * Put the object back into the pool and schedule work to free objects | |
269 | * if necessary. | |
270 | */ | |
271 | static void free_object(struct debug_obj *obj) | |
272 | { | |
273 | if (__free_object(obj)) | |
337fff8b | 274 | schedule_work(&debug_obj_work); |
3ac7fe5a TG |
275 | } |
276 | ||
277 | /* | |
278 | * We run out of memory. That means we probably have tons of objects | |
279 | * allocated. | |
280 | */ | |
281 | static void debug_objects_oom(void) | |
282 | { | |
283 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 284 | struct hlist_node *tmp; |
673d62cc | 285 | HLIST_HEAD(freelist); |
3ac7fe5a TG |
286 | struct debug_obj *obj; |
287 | unsigned long flags; | |
288 | int i; | |
289 | ||
719e4843 | 290 | pr_warn("Out of memory. ODEBUG disabled\n"); |
3ac7fe5a TG |
291 | |
292 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
aef9cb05 | 293 | raw_spin_lock_irqsave(&db->lock, flags); |
673d62cc | 294 | hlist_move_list(&db->list, &freelist); |
aef9cb05 | 295 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc VN |
296 | |
297 | /* Now free them */ | |
b67bfe0d | 298 | hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
3ac7fe5a TG |
299 | hlist_del(&obj->node); |
300 | free_object(obj); | |
301 | } | |
3ac7fe5a TG |
302 | } |
303 | } | |
304 | ||
305 | /* | |
306 | * We use the pfn of the address for the hash. That way we can check | |
307 | * for freed objects simply by checking the affected bucket. | |
308 | */ | |
309 | static struct debug_bucket *get_bucket(unsigned long addr) | |
310 | { | |
311 | unsigned long hash; | |
312 | ||
313 | hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS); | |
314 | return &obj_hash[hash]; | |
315 | } | |
316 | ||
317 | static void debug_print_object(struct debug_obj *obj, char *msg) | |
318 | { | |
99777288 | 319 | struct debug_obj_descr *descr = obj->descr; |
3ac7fe5a TG |
320 | static int limit; |
321 | ||
99777288 SG |
322 | if (limit < 5 && descr != descr_test) { |
323 | void *hint = descr->debug_hint ? | |
324 | descr->debug_hint(obj->object) : NULL; | |
3ac7fe5a | 325 | limit++; |
a5d8e467 | 326 | WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " |
99777288 | 327 | "object type: %s hint: %pS\n", |
a5d8e467 | 328 | msg, obj_states[obj->state], obj->astate, |
99777288 | 329 | descr->name, hint); |
3ac7fe5a TG |
330 | } |
331 | debug_objects_warnings++; | |
332 | } | |
333 | ||
334 | /* | |
335 | * Try to repair the damage, so we have a better chance to get useful | |
336 | * debug output. | |
337 | */ | |
b1e4d9d8 DC |
338 | static bool |
339 | debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state), | |
3ac7fe5a TG |
340 | void * addr, enum debug_obj_state state) |
341 | { | |
b1e4d9d8 DC |
342 | if (fixup && fixup(addr, state)) { |
343 | debug_objects_fixups++; | |
344 | return true; | |
345 | } | |
346 | return false; | |
3ac7fe5a TG |
347 | } |
348 | ||
349 | static void debug_object_is_on_stack(void *addr, int onstack) | |
350 | { | |
3ac7fe5a TG |
351 | int is_on_stack; |
352 | static int limit; | |
353 | ||
354 | if (limit > 4) | |
355 | return; | |
356 | ||
8b05c7e6 | 357 | is_on_stack = object_is_on_stack(addr); |
3ac7fe5a TG |
358 | if (is_on_stack == onstack) |
359 | return; | |
360 | ||
361 | limit++; | |
362 | if (is_on_stack) | |
719e4843 | 363 | pr_warn("object is on stack, but not annotated\n"); |
3ac7fe5a | 364 | else |
719e4843 | 365 | pr_warn("object is not on stack, but annotated\n"); |
3ac7fe5a TG |
366 | WARN_ON(1); |
367 | } | |
368 | ||
369 | static void | |
370 | __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) | |
371 | { | |
372 | enum debug_obj_state state; | |
373 | struct debug_bucket *db; | |
374 | struct debug_obj *obj; | |
375 | unsigned long flags; | |
376 | ||
50db04dd VN |
377 | fill_pool(); |
378 | ||
3ac7fe5a TG |
379 | db = get_bucket((unsigned long) addr); |
380 | ||
aef9cb05 | 381 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
382 | |
383 | obj = lookup_object(addr, db); | |
384 | if (!obj) { | |
385 | obj = alloc_object(addr, db, descr); | |
386 | if (!obj) { | |
387 | debug_objects_enabled = 0; | |
aef9cb05 | 388 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
389 | debug_objects_oom(); |
390 | return; | |
391 | } | |
392 | debug_object_is_on_stack(addr, onstack); | |
393 | } | |
394 | ||
395 | switch (obj->state) { | |
396 | case ODEBUG_STATE_NONE: | |
397 | case ODEBUG_STATE_INIT: | |
398 | case ODEBUG_STATE_INACTIVE: | |
399 | obj->state = ODEBUG_STATE_INIT; | |
400 | break; | |
401 | ||
402 | case ODEBUG_STATE_ACTIVE: | |
403 | debug_print_object(obj, "init"); | |
404 | state = obj->state; | |
aef9cb05 | 405 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
406 | debug_object_fixup(descr->fixup_init, addr, state); |
407 | return; | |
408 | ||
409 | case ODEBUG_STATE_DESTROYED: | |
410 | debug_print_object(obj, "init"); | |
411 | break; | |
412 | default: | |
413 | break; | |
414 | } | |
415 | ||
aef9cb05 | 416 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
417 | } |
418 | ||
419 | /** | |
420 | * debug_object_init - debug checks when an object is initialized | |
421 | * @addr: address of the object | |
422 | * @descr: pointer to an object specific debug description structure | |
423 | */ | |
424 | void debug_object_init(void *addr, struct debug_obj_descr *descr) | |
425 | { | |
426 | if (!debug_objects_enabled) | |
427 | return; | |
428 | ||
429 | __debug_object_init(addr, descr, 0); | |
430 | } | |
f8ff04e2 | 431 | EXPORT_SYMBOL_GPL(debug_object_init); |
3ac7fe5a TG |
432 | |
433 | /** | |
434 | * debug_object_init_on_stack - debug checks when an object on stack is | |
435 | * initialized | |
436 | * @addr: address of the object | |
437 | * @descr: pointer to an object specific debug description structure | |
438 | */ | |
439 | void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) | |
440 | { | |
441 | if (!debug_objects_enabled) | |
442 | return; | |
443 | ||
444 | __debug_object_init(addr, descr, 1); | |
445 | } | |
f8ff04e2 | 446 | EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
3ac7fe5a TG |
447 | |
448 | /** | |
449 | * debug_object_activate - debug checks when an object is activated | |
450 | * @addr: address of the object | |
451 | * @descr: pointer to an object specific debug description structure | |
b778ae25 | 452 | * Returns 0 for success, -EINVAL for check failed. |
3ac7fe5a | 453 | */ |
b778ae25 | 454 | int debug_object_activate(void *addr, struct debug_obj_descr *descr) |
3ac7fe5a TG |
455 | { |
456 | enum debug_obj_state state; | |
457 | struct debug_bucket *db; | |
458 | struct debug_obj *obj; | |
459 | unsigned long flags; | |
b778ae25 | 460 | int ret; |
feac18dd SB |
461 | struct debug_obj o = { .object = addr, |
462 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
463 | .descr = descr }; | |
3ac7fe5a TG |
464 | |
465 | if (!debug_objects_enabled) | |
b778ae25 | 466 | return 0; |
3ac7fe5a TG |
467 | |
468 | db = get_bucket((unsigned long) addr); | |
469 | ||
aef9cb05 | 470 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
471 | |
472 | obj = lookup_object(addr, db); | |
473 | if (obj) { | |
474 | switch (obj->state) { | |
475 | case ODEBUG_STATE_INIT: | |
476 | case ODEBUG_STATE_INACTIVE: | |
477 | obj->state = ODEBUG_STATE_ACTIVE; | |
b778ae25 | 478 | ret = 0; |
3ac7fe5a TG |
479 | break; |
480 | ||
481 | case ODEBUG_STATE_ACTIVE: | |
482 | debug_print_object(obj, "activate"); | |
483 | state = obj->state; | |
aef9cb05 | 484 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 485 | ret = debug_object_fixup(descr->fixup_activate, addr, state); |
e7a8e78b | 486 | return ret ? 0 : -EINVAL; |
3ac7fe5a TG |
487 | |
488 | case ODEBUG_STATE_DESTROYED: | |
489 | debug_print_object(obj, "activate"); | |
b778ae25 | 490 | ret = -EINVAL; |
3ac7fe5a TG |
491 | break; |
492 | default: | |
b778ae25 | 493 | ret = 0; |
3ac7fe5a TG |
494 | break; |
495 | } | |
aef9cb05 | 496 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 497 | return ret; |
3ac7fe5a TG |
498 | } |
499 | ||
aef9cb05 | 500 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 501 | /* |
b9fdac7f DC |
502 | * We are here when a static object is activated. We |
503 | * let the type specific code confirm whether this is | |
504 | * true or not. if true, we just make sure that the | |
505 | * static object is tracked in the object tracker. If | |
506 | * not, this must be a bug, so we try to fix it up. | |
3ac7fe5a | 507 | */ |
b9fdac7f DC |
508 | if (descr->is_static_object && descr->is_static_object(addr)) { |
509 | /* track this static object */ | |
510 | debug_object_init(addr, descr); | |
511 | debug_object_activate(addr, descr); | |
512 | } else { | |
feac18dd | 513 | debug_print_object(&o, "activate"); |
b9fdac7f DC |
514 | ret = debug_object_fixup(descr->fixup_activate, addr, |
515 | ODEBUG_STATE_NOTAVAILABLE); | |
516 | return ret ? 0 : -EINVAL; | |
b778ae25 PM |
517 | } |
518 | return 0; | |
3ac7fe5a | 519 | } |
f8ff04e2 | 520 | EXPORT_SYMBOL_GPL(debug_object_activate); |
3ac7fe5a TG |
521 | |
522 | /** | |
523 | * debug_object_deactivate - debug checks when an object is deactivated | |
524 | * @addr: address of the object | |
525 | * @descr: pointer to an object specific debug description structure | |
526 | */ | |
527 | void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) | |
528 | { | |
529 | struct debug_bucket *db; | |
530 | struct debug_obj *obj; | |
531 | unsigned long flags; | |
532 | ||
533 | if (!debug_objects_enabled) | |
534 | return; | |
535 | ||
536 | db = get_bucket((unsigned long) addr); | |
537 | ||
aef9cb05 | 538 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
539 | |
540 | obj = lookup_object(addr, db); | |
541 | if (obj) { | |
542 | switch (obj->state) { | |
543 | case ODEBUG_STATE_INIT: | |
544 | case ODEBUG_STATE_INACTIVE: | |
545 | case ODEBUG_STATE_ACTIVE: | |
a5d8e467 MD |
546 | if (!obj->astate) |
547 | obj->state = ODEBUG_STATE_INACTIVE; | |
548 | else | |
549 | debug_print_object(obj, "deactivate"); | |
3ac7fe5a TG |
550 | break; |
551 | ||
552 | case ODEBUG_STATE_DESTROYED: | |
553 | debug_print_object(obj, "deactivate"); | |
554 | break; | |
555 | default: | |
556 | break; | |
557 | } | |
558 | } else { | |
559 | struct debug_obj o = { .object = addr, | |
560 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
561 | .descr = descr }; | |
562 | ||
563 | debug_print_object(&o, "deactivate"); | |
564 | } | |
565 | ||
aef9cb05 | 566 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 567 | } |
f8ff04e2 | 568 | EXPORT_SYMBOL_GPL(debug_object_deactivate); |
3ac7fe5a TG |
569 | |
570 | /** | |
571 | * debug_object_destroy - debug checks when an object is destroyed | |
572 | * @addr: address of the object | |
573 | * @descr: pointer to an object specific debug description structure | |
574 | */ | |
575 | void debug_object_destroy(void *addr, struct debug_obj_descr *descr) | |
576 | { | |
577 | enum debug_obj_state state; | |
578 | struct debug_bucket *db; | |
579 | struct debug_obj *obj; | |
580 | unsigned long flags; | |
581 | ||
582 | if (!debug_objects_enabled) | |
583 | return; | |
584 | ||
585 | db = get_bucket((unsigned long) addr); | |
586 | ||
aef9cb05 | 587 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
588 | |
589 | obj = lookup_object(addr, db); | |
590 | if (!obj) | |
591 | goto out_unlock; | |
592 | ||
593 | switch (obj->state) { | |
594 | case ODEBUG_STATE_NONE: | |
595 | case ODEBUG_STATE_INIT: | |
596 | case ODEBUG_STATE_INACTIVE: | |
597 | obj->state = ODEBUG_STATE_DESTROYED; | |
598 | break; | |
599 | case ODEBUG_STATE_ACTIVE: | |
600 | debug_print_object(obj, "destroy"); | |
601 | state = obj->state; | |
aef9cb05 | 602 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
603 | debug_object_fixup(descr->fixup_destroy, addr, state); |
604 | return; | |
605 | ||
606 | case ODEBUG_STATE_DESTROYED: | |
607 | debug_print_object(obj, "destroy"); | |
608 | break; | |
609 | default: | |
610 | break; | |
611 | } | |
612 | out_unlock: | |
aef9cb05 | 613 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 614 | } |
f8ff04e2 | 615 | EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a TG |
616 | |
617 | /** | |
618 | * debug_object_free - debug checks when an object is freed | |
619 | * @addr: address of the object | |
620 | * @descr: pointer to an object specific debug description structure | |
621 | */ | |
622 | void debug_object_free(void *addr, struct debug_obj_descr *descr) | |
623 | { | |
624 | enum debug_obj_state state; | |
625 | struct debug_bucket *db; | |
626 | struct debug_obj *obj; | |
627 | unsigned long flags; | |
628 | ||
629 | if (!debug_objects_enabled) | |
630 | return; | |
631 | ||
632 | db = get_bucket((unsigned long) addr); | |
633 | ||
aef9cb05 | 634 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
635 | |
636 | obj = lookup_object(addr, db); | |
637 | if (!obj) | |
638 | goto out_unlock; | |
639 | ||
640 | switch (obj->state) { | |
641 | case ODEBUG_STATE_ACTIVE: | |
642 | debug_print_object(obj, "free"); | |
643 | state = obj->state; | |
aef9cb05 | 644 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
645 | debug_object_fixup(descr->fixup_free, addr, state); |
646 | return; | |
647 | default: | |
648 | hlist_del(&obj->node); | |
aef9cb05 | 649 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 650 | free_object(obj); |
673d62cc | 651 | return; |
3ac7fe5a TG |
652 | } |
653 | out_unlock: | |
aef9cb05 | 654 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 655 | } |
f8ff04e2 | 656 | EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a | 657 | |
b84d435c CC |
658 | /** |
659 | * debug_object_assert_init - debug checks when object should be init-ed | |
660 | * @addr: address of the object | |
661 | * @descr: pointer to an object specific debug description structure | |
662 | */ | |
663 | void debug_object_assert_init(void *addr, struct debug_obj_descr *descr) | |
664 | { | |
665 | struct debug_bucket *db; | |
666 | struct debug_obj *obj; | |
667 | unsigned long flags; | |
668 | ||
669 | if (!debug_objects_enabled) | |
670 | return; | |
671 | ||
672 | db = get_bucket((unsigned long) addr); | |
673 | ||
674 | raw_spin_lock_irqsave(&db->lock, flags); | |
675 | ||
676 | obj = lookup_object(addr, db); | |
677 | if (!obj) { | |
678 | struct debug_obj o = { .object = addr, | |
679 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
680 | .descr = descr }; | |
681 | ||
682 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
683 | /* | |
b9fdac7f DC |
684 | * Maybe the object is static, and we let the type specific |
685 | * code confirm. Track this static object if true, else invoke | |
686 | * fixup. | |
b84d435c | 687 | */ |
b9fdac7f DC |
688 | if (descr->is_static_object && descr->is_static_object(addr)) { |
689 | /* Track this static object */ | |
690 | debug_object_init(addr, descr); | |
691 | } else { | |
b84d435c | 692 | debug_print_object(&o, "assert_init"); |
b9fdac7f DC |
693 | debug_object_fixup(descr->fixup_assert_init, addr, |
694 | ODEBUG_STATE_NOTAVAILABLE); | |
695 | } | |
b84d435c CC |
696 | return; |
697 | } | |
698 | ||
699 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
700 | } | |
f8ff04e2 | 701 | EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435c | 702 | |
a5d8e467 MD |
703 | /** |
704 | * debug_object_active_state - debug checks object usage state machine | |
705 | * @addr: address of the object | |
706 | * @descr: pointer to an object specific debug description structure | |
707 | * @expect: expected state | |
708 | * @next: state to move to if expected state is found | |
709 | */ | |
710 | void | |
711 | debug_object_active_state(void *addr, struct debug_obj_descr *descr, | |
712 | unsigned int expect, unsigned int next) | |
713 | { | |
714 | struct debug_bucket *db; | |
715 | struct debug_obj *obj; | |
716 | unsigned long flags; | |
717 | ||
718 | if (!debug_objects_enabled) | |
719 | return; | |
720 | ||
721 | db = get_bucket((unsigned long) addr); | |
722 | ||
723 | raw_spin_lock_irqsave(&db->lock, flags); | |
724 | ||
725 | obj = lookup_object(addr, db); | |
726 | if (obj) { | |
727 | switch (obj->state) { | |
728 | case ODEBUG_STATE_ACTIVE: | |
729 | if (obj->astate == expect) | |
730 | obj->astate = next; | |
731 | else | |
732 | debug_print_object(obj, "active_state"); | |
733 | break; | |
734 | ||
735 | default: | |
736 | debug_print_object(obj, "active_state"); | |
737 | break; | |
738 | } | |
739 | } else { | |
740 | struct debug_obj o = { .object = addr, | |
741 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
742 | .descr = descr }; | |
743 | ||
744 | debug_print_object(&o, "active_state"); | |
745 | } | |
746 | ||
747 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
748 | } | |
f8ff04e2 | 749 | EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467 | 750 | |
3ac7fe5a TG |
751 | #ifdef CONFIG_DEBUG_OBJECTS_FREE |
752 | static void __debug_check_no_obj_freed(const void *address, unsigned long size) | |
753 | { | |
754 | unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; | |
3ac7fe5a TG |
755 | struct debug_obj_descr *descr; |
756 | enum debug_obj_state state; | |
757 | struct debug_bucket *db; | |
1ea9b98b | 758 | struct hlist_node *tmp; |
3ac7fe5a | 759 | struct debug_obj *obj; |
bd9dcd04 | 760 | int cnt, objs_checked = 0; |
1ea9b98b | 761 | bool work = false; |
3ac7fe5a TG |
762 | |
763 | saddr = (unsigned long) address; | |
764 | eaddr = saddr + size; | |
765 | paddr = saddr & ODEBUG_CHUNK_MASK; | |
766 | chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); | |
767 | chunks >>= ODEBUG_CHUNK_SHIFT; | |
768 | ||
769 | for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { | |
770 | db = get_bucket(paddr); | |
771 | ||
772 | repeat: | |
773 | cnt = 0; | |
aef9cb05 | 774 | raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d | 775 | hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a TG |
776 | cnt++; |
777 | oaddr = (unsigned long) obj->object; | |
778 | if (oaddr < saddr || oaddr >= eaddr) | |
779 | continue; | |
780 | ||
781 | switch (obj->state) { | |
782 | case ODEBUG_STATE_ACTIVE: | |
783 | debug_print_object(obj, "free"); | |
784 | descr = obj->descr; | |
785 | state = obj->state; | |
aef9cb05 | 786 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
787 | debug_object_fixup(descr->fixup_free, |
788 | (void *) oaddr, state); | |
789 | goto repeat; | |
790 | default: | |
791 | hlist_del(&obj->node); | |
1ea9b98b | 792 | work |= __free_object(obj); |
3ac7fe5a TG |
793 | break; |
794 | } | |
795 | } | |
aef9cb05 | 796 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc | 797 | |
3ac7fe5a TG |
798 | if (cnt > debug_objects_maxchain) |
799 | debug_objects_maxchain = cnt; | |
bd9dcd04 YS |
800 | |
801 | objs_checked += cnt; | |
3ac7fe5a | 802 | } |
bd9dcd04 YS |
803 | |
804 | if (objs_checked > debug_objects_maxchecked) | |
805 | debug_objects_maxchecked = objs_checked; | |
1ea9b98b YS |
806 | |
807 | /* Schedule work to actually kmem_cache_free() objects */ | |
808 | if (work) | |
809 | schedule_work(&debug_obj_work); | |
3ac7fe5a TG |
810 | } |
811 | ||
812 | void debug_check_no_obj_freed(const void *address, unsigned long size) | |
813 | { | |
814 | if (debug_objects_enabled) | |
815 | __debug_check_no_obj_freed(address, size); | |
816 | } | |
817 | #endif | |
818 | ||
819 | #ifdef CONFIG_DEBUG_FS | |
820 | ||
821 | static int debug_stats_show(struct seq_file *m, void *v) | |
822 | { | |
823 | seq_printf(m, "max_chain :%d\n", debug_objects_maxchain); | |
bd9dcd04 | 824 | seq_printf(m, "max_checked :%d\n", debug_objects_maxchecked); |
3ac7fe5a TG |
825 | seq_printf(m, "warnings :%d\n", debug_objects_warnings); |
826 | seq_printf(m, "fixups :%d\n", debug_objects_fixups); | |
827 | seq_printf(m, "pool_free :%d\n", obj_pool_free); | |
828 | seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free); | |
829 | seq_printf(m, "pool_used :%d\n", obj_pool_used); | |
830 | seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used); | |
36c4ead6 | 831 | seq_printf(m, "on_free_list :%d\n", obj_nr_tofree); |
0cad93c3 WL |
832 | seq_printf(m, "objs_allocated:%d\n", debug_objects_allocated); |
833 | seq_printf(m, "objs_freed :%d\n", debug_objects_freed); | |
3ac7fe5a TG |
834 | return 0; |
835 | } | |
836 | ||
837 | static int debug_stats_open(struct inode *inode, struct file *filp) | |
838 | { | |
839 | return single_open(filp, debug_stats_show, NULL); | |
840 | } | |
841 | ||
842 | static const struct file_operations debug_stats_fops = { | |
843 | .open = debug_stats_open, | |
844 | .read = seq_read, | |
845 | .llseek = seq_lseek, | |
846 | .release = single_release, | |
847 | }; | |
848 | ||
849 | static int __init debug_objects_init_debugfs(void) | |
850 | { | |
851 | struct dentry *dbgdir, *dbgstats; | |
852 | ||
853 | if (!debug_objects_enabled) | |
854 | return 0; | |
855 | ||
856 | dbgdir = debugfs_create_dir("debug_objects", NULL); | |
857 | if (!dbgdir) | |
858 | return -ENOMEM; | |
859 | ||
860 | dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL, | |
861 | &debug_stats_fops); | |
862 | if (!dbgstats) | |
863 | goto err; | |
864 | ||
865 | return 0; | |
866 | ||
867 | err: | |
868 | debugfs_remove(dbgdir); | |
869 | ||
870 | return -ENOMEM; | |
871 | } | |
872 | __initcall(debug_objects_init_debugfs); | |
873 | ||
874 | #else | |
875 | static inline void debug_objects_init_debugfs(void) { } | |
876 | #endif | |
877 | ||
878 | #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST | |
879 | ||
880 | /* Random data structure for the self test */ | |
881 | struct self_test { | |
882 | unsigned long dummy1[6]; | |
883 | int static_init; | |
884 | unsigned long dummy2[3]; | |
885 | }; | |
886 | ||
887 | static __initdata struct debug_obj_descr descr_type_test; | |
888 | ||
b9fdac7f DC |
889 | static bool __init is_static_object(void *addr) |
890 | { | |
891 | struct self_test *obj = addr; | |
892 | ||
893 | return obj->static_init; | |
894 | } | |
895 | ||
3ac7fe5a TG |
896 | /* |
897 | * fixup_init is called when: | |
898 | * - an active object is initialized | |
899 | */ | |
b1e4d9d8 | 900 | static bool __init fixup_init(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_init(obj, &descr_type_test); | |
b1e4d9d8 | 908 | return true; |
3ac7fe5a | 909 | default: |
b1e4d9d8 | 910 | return false; |
3ac7fe5a TG |
911 | } |
912 | } | |
913 | ||
914 | /* | |
915 | * fixup_activate is called when: | |
916 | * - an active object is activated | |
b9fdac7f | 917 | * - an unknown non-static object is activated |
3ac7fe5a | 918 | */ |
b1e4d9d8 | 919 | static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
920 | { |
921 | struct self_test *obj = addr; | |
922 | ||
923 | switch (state) { | |
924 | case ODEBUG_STATE_NOTAVAILABLE: | |
b1e4d9d8 | 925 | return true; |
3ac7fe5a TG |
926 | case ODEBUG_STATE_ACTIVE: |
927 | debug_object_deactivate(obj, &descr_type_test); | |
928 | debug_object_activate(obj, &descr_type_test); | |
b1e4d9d8 | 929 | return true; |
3ac7fe5a TG |
930 | |
931 | default: | |
b1e4d9d8 | 932 | return false; |
3ac7fe5a TG |
933 | } |
934 | } | |
935 | ||
936 | /* | |
937 | * fixup_destroy is called when: | |
938 | * - an active object is destroyed | |
939 | */ | |
b1e4d9d8 | 940 | static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
941 | { |
942 | struct self_test *obj = addr; | |
943 | ||
944 | switch (state) { | |
945 | case ODEBUG_STATE_ACTIVE: | |
946 | debug_object_deactivate(obj, &descr_type_test); | |
947 | debug_object_destroy(obj, &descr_type_test); | |
b1e4d9d8 | 948 | return true; |
3ac7fe5a | 949 | default: |
b1e4d9d8 | 950 | return false; |
3ac7fe5a TG |
951 | } |
952 | } | |
953 | ||
954 | /* | |
955 | * fixup_free is called when: | |
956 | * - an active object is freed | |
957 | */ | |
b1e4d9d8 | 958 | static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
959 | { |
960 | struct self_test *obj = addr; | |
961 | ||
962 | switch (state) { | |
963 | case ODEBUG_STATE_ACTIVE: | |
964 | debug_object_deactivate(obj, &descr_type_test); | |
965 | debug_object_free(obj, &descr_type_test); | |
b1e4d9d8 | 966 | return true; |
3ac7fe5a | 967 | default: |
b1e4d9d8 | 968 | return false; |
3ac7fe5a TG |
969 | } |
970 | } | |
971 | ||
1fb2f77c | 972 | static int __init |
3ac7fe5a TG |
973 | check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) |
974 | { | |
975 | struct debug_bucket *db; | |
976 | struct debug_obj *obj; | |
977 | unsigned long flags; | |
978 | int res = -EINVAL; | |
979 | ||
980 | db = get_bucket((unsigned long) addr); | |
981 | ||
aef9cb05 | 982 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
983 | |
984 | obj = lookup_object(addr, db); | |
985 | if (!obj && state != ODEBUG_STATE_NONE) { | |
5cd2b459 | 986 | WARN(1, KERN_ERR "ODEBUG: selftest object not found\n"); |
3ac7fe5a TG |
987 | goto out; |
988 | } | |
989 | if (obj && obj->state != state) { | |
5cd2b459 | 990 | WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n", |
3ac7fe5a | 991 | obj->state, state); |
3ac7fe5a TG |
992 | goto out; |
993 | } | |
994 | if (fixups != debug_objects_fixups) { | |
5cd2b459 | 995 | WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n", |
3ac7fe5a | 996 | fixups, debug_objects_fixups); |
3ac7fe5a TG |
997 | goto out; |
998 | } | |
999 | if (warnings != debug_objects_warnings) { | |
5cd2b459 | 1000 | WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n", |
3ac7fe5a | 1001 | warnings, debug_objects_warnings); |
3ac7fe5a TG |
1002 | goto out; |
1003 | } | |
1004 | res = 0; | |
1005 | out: | |
aef9cb05 | 1006 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
1007 | if (res) |
1008 | debug_objects_enabled = 0; | |
1009 | return res; | |
1010 | } | |
1011 | ||
1012 | static __initdata struct debug_obj_descr descr_type_test = { | |
1013 | .name = "selftest", | |
b9fdac7f | 1014 | .is_static_object = is_static_object, |
3ac7fe5a TG |
1015 | .fixup_init = fixup_init, |
1016 | .fixup_activate = fixup_activate, | |
1017 | .fixup_destroy = fixup_destroy, | |
1018 | .fixup_free = fixup_free, | |
1019 | }; | |
1020 | ||
1021 | static __initdata struct self_test obj = { .static_init = 0 }; | |
1022 | ||
1023 | static void __init debug_objects_selftest(void) | |
1024 | { | |
1025 | int fixups, oldfixups, warnings, oldwarnings; | |
1026 | unsigned long flags; | |
1027 | ||
1028 | local_irq_save(flags); | |
1029 | ||
1030 | fixups = oldfixups = debug_objects_fixups; | |
1031 | warnings = oldwarnings = debug_objects_warnings; | |
1032 | descr_test = &descr_type_test; | |
1033 | ||
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_object_activate(&obj, &descr_type_test); | |
1041 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) | |
1042 | goto out; | |
1043 | debug_object_deactivate(&obj, &descr_type_test); | |
1044 | if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) | |
1045 | goto out; | |
1046 | debug_object_destroy(&obj, &descr_type_test); | |
1047 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) | |
1048 | goto out; | |
1049 | debug_object_init(&obj, &descr_type_test); | |
1050 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1051 | goto out; | |
1052 | debug_object_activate(&obj, &descr_type_test); | |
1053 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1054 | goto out; | |
1055 | debug_object_deactivate(&obj, &descr_type_test); | |
1056 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1057 | goto out; | |
1058 | debug_object_free(&obj, &descr_type_test); | |
1059 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1060 | goto out; | |
1061 | ||
1062 | obj.static_init = 1; | |
1063 | debug_object_activate(&obj, &descr_type_test); | |
9f78ff00 | 1064 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a TG |
1065 | goto out; |
1066 | debug_object_init(&obj, &descr_type_test); | |
1067 | if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) | |
1068 | goto out; | |
1069 | debug_object_free(&obj, &descr_type_test); | |
1070 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1071 | goto out; | |
1072 | ||
1073 | #ifdef CONFIG_DEBUG_OBJECTS_FREE | |
1074 | debug_object_init(&obj, &descr_type_test); | |
1075 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
1076 | goto out; | |
1077 | debug_object_activate(&obj, &descr_type_test); | |
1078 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
1079 | goto out; | |
1080 | __debug_check_no_obj_freed(&obj, sizeof(obj)); | |
1081 | if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) | |
1082 | goto out; | |
1083 | #endif | |
719e4843 | 1084 | pr_info("selftest passed\n"); |
3ac7fe5a TG |
1085 | |
1086 | out: | |
1087 | debug_objects_fixups = oldfixups; | |
1088 | debug_objects_warnings = oldwarnings; | |
1089 | descr_test = NULL; | |
1090 | ||
1091 | local_irq_restore(flags); | |
1092 | } | |
1093 | #else | |
1094 | static inline void debug_objects_selftest(void) { } | |
1095 | #endif | |
1096 | ||
1097 | /* | |
1098 | * Called during early boot to initialize the hash buckets and link | |
1099 | * the static object pool objects into the poll list. After this call | |
1100 | * the object tracker is fully operational. | |
1101 | */ | |
1102 | void __init debug_objects_early_init(void) | |
1103 | { | |
1104 | int i; | |
1105 | ||
1106 | for (i = 0; i < ODEBUG_HASH_SIZE; i++) | |
aef9cb05 | 1107 | raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a TG |
1108 | |
1109 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) | |
1110 | hlist_add_head(&obj_static_pool[i].node, &obj_pool); | |
1111 | } | |
1112 | ||
1be1cb7b TG |
1113 | /* |
1114 | * Convert the statically allocated objects to dynamic ones: | |
1115 | */ | |
1fb2f77c | 1116 | static int __init debug_objects_replace_static_objects(void) |
1be1cb7b TG |
1117 | { |
1118 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 1119 | struct hlist_node *tmp; |
1be1cb7b TG |
1120 | struct debug_obj *obj, *new; |
1121 | HLIST_HEAD(objects); | |
1122 | int i, cnt = 0; | |
1123 | ||
1124 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) { | |
1125 | obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); | |
1126 | if (!obj) | |
1127 | goto free; | |
caba4cbb | 1128 | kmemleak_ignore(obj); |
1be1cb7b TG |
1129 | hlist_add_head(&obj->node, &objects); |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * When debug_objects_mem_init() is called we know that only | |
1134 | * one CPU is up, so disabling interrupts is enough | |
1135 | * protection. This avoids the lockdep hell of lock ordering. | |
1136 | */ | |
1137 | local_irq_disable(); | |
1138 | ||
1139 | /* Remove the statically allocated objects from the pool */ | |
b67bfe0d | 1140 | hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b TG |
1141 | hlist_del(&obj->node); |
1142 | /* Move the allocated objects to the pool */ | |
1143 | hlist_move_list(&objects, &obj_pool); | |
1144 | ||
1145 | /* Replace the active object references */ | |
1146 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
1147 | hlist_move_list(&db->list, &objects); | |
1148 | ||
b67bfe0d | 1149 | hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b TG |
1150 | new = hlist_entry(obj_pool.first, typeof(*obj), node); |
1151 | hlist_del(&new->node); | |
1152 | /* copy object data */ | |
1153 | *new = *obj; | |
1154 | hlist_add_head(&new->node, &db->list); | |
1155 | cnt++; | |
1156 | } | |
1157 | } | |
765a5e0c | 1158 | local_irq_enable(); |
1be1cb7b | 1159 | |
c0f35cc0 FF |
1160 | pr_debug("%d of %d active objects replaced\n", |
1161 | cnt, obj_pool_used); | |
1be1cb7b TG |
1162 | return 0; |
1163 | free: | |
b67bfe0d | 1164 | hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b TG |
1165 | hlist_del(&obj->node); |
1166 | kmem_cache_free(obj_cache, obj); | |
1167 | } | |
1168 | return -ENOMEM; | |
1169 | } | |
1170 | ||
3ac7fe5a TG |
1171 | /* |
1172 | * Called after the kmem_caches are functional to setup a dedicated | |
1173 | * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag | |
1174 | * prevents that the debug code is called on kmem_cache_free() for the | |
1175 | * debug tracker objects to avoid recursive calls. | |
1176 | */ | |
1177 | void __init debug_objects_mem_init(void) | |
1178 | { | |
1179 | if (!debug_objects_enabled) | |
1180 | return; | |
1181 | ||
1182 | obj_cache = kmem_cache_create("debug_objects_cache", | |
1183 | sizeof (struct debug_obj), 0, | |
1184 | SLAB_DEBUG_OBJECTS, NULL); | |
1185 | ||
1be1cb7b | 1186 | if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a | 1187 | debug_objects_enabled = 0; |
1be1cb7b TG |
1188 | if (obj_cache) |
1189 | kmem_cache_destroy(obj_cache); | |
719e4843 | 1190 | pr_warn("out of memory.\n"); |
1be1cb7b | 1191 | } else |
3ac7fe5a | 1192 | debug_objects_selftest(); |
97dd552e WL |
1193 | |
1194 | /* | |
1195 | * Increase the thresholds for allocating and freeing objects | |
1196 | * according to the number of possible CPUs available in the system. | |
1197 | */ | |
1198 | debug_objects_pool_size += num_possible_cpus() * 32; | |
1199 | debug_objects_pool_min_level += num_possible_cpus() * 4; | |
3ac7fe5a | 1200 | } |