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; | |
bd9dcd04 | 56 | static int 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); | |
236 | obj_nr_tofree = 0; | |
237 | } | |
aef9cb05 | 238 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
36c4ead6 YS |
239 | |
240 | hlist_for_each_entry_safe(obj, tmp, &tofree, node) { | |
241 | hlist_del(&obj->node); | |
242 | kmem_cache_free(obj_cache, obj); | |
243 | } | |
337fff8b TG |
244 | } |
245 | ||
636e1970 | 246 | static bool __free_object(struct debug_obj *obj) |
337fff8b TG |
247 | { |
248 | unsigned long flags; | |
636e1970 | 249 | bool work; |
337fff8b | 250 | |
aef9cb05 | 251 | raw_spin_lock_irqsave(&pool_lock, flags); |
636e1970 | 252 | work = (obj_pool_free > debug_objects_pool_size) && obj_cache; |
337fff8b | 253 | obj_pool_used--; |
636e1970 YS |
254 | |
255 | if (work) { | |
256 | obj_nr_tofree++; | |
257 | hlist_add_head(&obj->node, &obj_to_free); | |
258 | } else { | |
259 | obj_pool_free++; | |
260 | hlist_add_head(&obj->node, &obj_pool); | |
261 | } | |
aef9cb05 | 262 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
636e1970 YS |
263 | return work; |
264 | } | |
265 | ||
266 | /* | |
267 | * Put the object back into the pool and schedule work to free objects | |
268 | * if necessary. | |
269 | */ | |
270 | static void free_object(struct debug_obj *obj) | |
271 | { | |
272 | if (__free_object(obj)) | |
337fff8b | 273 | schedule_work(&debug_obj_work); |
3ac7fe5a TG |
274 | } |
275 | ||
276 | /* | |
277 | * We run out of memory. That means we probably have tons of objects | |
278 | * allocated. | |
279 | */ | |
280 | static void debug_objects_oom(void) | |
281 | { | |
282 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 283 | struct hlist_node *tmp; |
673d62cc | 284 | HLIST_HEAD(freelist); |
3ac7fe5a TG |
285 | struct debug_obj *obj; |
286 | unsigned long flags; | |
287 | int i; | |
288 | ||
719e4843 | 289 | pr_warn("Out of memory. ODEBUG disabled\n"); |
3ac7fe5a TG |
290 | |
291 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
aef9cb05 | 292 | raw_spin_lock_irqsave(&db->lock, flags); |
673d62cc | 293 | hlist_move_list(&db->list, &freelist); |
aef9cb05 | 294 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc VN |
295 | |
296 | /* Now free them */ | |
b67bfe0d | 297 | hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
3ac7fe5a TG |
298 | hlist_del(&obj->node); |
299 | free_object(obj); | |
300 | } | |
3ac7fe5a TG |
301 | } |
302 | } | |
303 | ||
304 | /* | |
305 | * We use the pfn of the address for the hash. That way we can check | |
306 | * for freed objects simply by checking the affected bucket. | |
307 | */ | |
308 | static struct debug_bucket *get_bucket(unsigned long addr) | |
309 | { | |
310 | unsigned long hash; | |
311 | ||
312 | hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS); | |
313 | return &obj_hash[hash]; | |
314 | } | |
315 | ||
316 | static void debug_print_object(struct debug_obj *obj, char *msg) | |
317 | { | |
99777288 | 318 | struct debug_obj_descr *descr = obj->descr; |
3ac7fe5a TG |
319 | static int limit; |
320 | ||
99777288 SG |
321 | if (limit < 5 && descr != descr_test) { |
322 | void *hint = descr->debug_hint ? | |
323 | descr->debug_hint(obj->object) : NULL; | |
3ac7fe5a | 324 | limit++; |
a5d8e467 | 325 | WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " |
99777288 | 326 | "object type: %s hint: %pS\n", |
a5d8e467 | 327 | msg, obj_states[obj->state], obj->astate, |
99777288 | 328 | descr->name, hint); |
3ac7fe5a TG |
329 | } |
330 | debug_objects_warnings++; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Try to repair the damage, so we have a better chance to get useful | |
335 | * debug output. | |
336 | */ | |
b1e4d9d8 DC |
337 | static bool |
338 | debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state), | |
3ac7fe5a TG |
339 | void * addr, enum debug_obj_state state) |
340 | { | |
b1e4d9d8 DC |
341 | if (fixup && fixup(addr, state)) { |
342 | debug_objects_fixups++; | |
343 | return true; | |
344 | } | |
345 | return false; | |
3ac7fe5a TG |
346 | } |
347 | ||
348 | static void debug_object_is_on_stack(void *addr, int onstack) | |
349 | { | |
3ac7fe5a TG |
350 | int is_on_stack; |
351 | static int limit; | |
352 | ||
353 | if (limit > 4) | |
354 | return; | |
355 | ||
8b05c7e6 | 356 | is_on_stack = object_is_on_stack(addr); |
3ac7fe5a TG |
357 | if (is_on_stack == onstack) |
358 | return; | |
359 | ||
360 | limit++; | |
361 | if (is_on_stack) | |
719e4843 | 362 | pr_warn("object is on stack, but not annotated\n"); |
3ac7fe5a | 363 | else |
719e4843 | 364 | pr_warn("object is not on stack, but annotated\n"); |
3ac7fe5a TG |
365 | WARN_ON(1); |
366 | } | |
367 | ||
368 | static void | |
369 | __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) | |
370 | { | |
371 | enum debug_obj_state state; | |
372 | struct debug_bucket *db; | |
373 | struct debug_obj *obj; | |
374 | unsigned long flags; | |
375 | ||
50db04dd VN |
376 | fill_pool(); |
377 | ||
3ac7fe5a TG |
378 | db = get_bucket((unsigned long) addr); |
379 | ||
aef9cb05 | 380 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
381 | |
382 | obj = lookup_object(addr, db); | |
383 | if (!obj) { | |
384 | obj = alloc_object(addr, db, descr); | |
385 | if (!obj) { | |
386 | debug_objects_enabled = 0; | |
aef9cb05 | 387 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
388 | debug_objects_oom(); |
389 | return; | |
390 | } | |
391 | debug_object_is_on_stack(addr, onstack); | |
392 | } | |
393 | ||
394 | switch (obj->state) { | |
395 | case ODEBUG_STATE_NONE: | |
396 | case ODEBUG_STATE_INIT: | |
397 | case ODEBUG_STATE_INACTIVE: | |
398 | obj->state = ODEBUG_STATE_INIT; | |
399 | break; | |
400 | ||
401 | case ODEBUG_STATE_ACTIVE: | |
402 | debug_print_object(obj, "init"); | |
403 | state = obj->state; | |
aef9cb05 | 404 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
405 | debug_object_fixup(descr->fixup_init, addr, state); |
406 | return; | |
407 | ||
408 | case ODEBUG_STATE_DESTROYED: | |
409 | debug_print_object(obj, "init"); | |
410 | break; | |
411 | default: | |
412 | break; | |
413 | } | |
414 | ||
aef9cb05 | 415 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
416 | } |
417 | ||
418 | /** | |
419 | * debug_object_init - debug checks when an object is initialized | |
420 | * @addr: address of the object | |
421 | * @descr: pointer to an object specific debug description structure | |
422 | */ | |
423 | void debug_object_init(void *addr, struct debug_obj_descr *descr) | |
424 | { | |
425 | if (!debug_objects_enabled) | |
426 | return; | |
427 | ||
428 | __debug_object_init(addr, descr, 0); | |
429 | } | |
f8ff04e2 | 430 | EXPORT_SYMBOL_GPL(debug_object_init); |
3ac7fe5a TG |
431 | |
432 | /** | |
433 | * debug_object_init_on_stack - debug checks when an object on stack is | |
434 | * initialized | |
435 | * @addr: address of the object | |
436 | * @descr: pointer to an object specific debug description structure | |
437 | */ | |
438 | void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) | |
439 | { | |
440 | if (!debug_objects_enabled) | |
441 | return; | |
442 | ||
443 | __debug_object_init(addr, descr, 1); | |
444 | } | |
f8ff04e2 | 445 | EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
3ac7fe5a TG |
446 | |
447 | /** | |
448 | * debug_object_activate - debug checks when an object is activated | |
449 | * @addr: address of the object | |
450 | * @descr: pointer to an object specific debug description structure | |
b778ae25 | 451 | * Returns 0 for success, -EINVAL for check failed. |
3ac7fe5a | 452 | */ |
b778ae25 | 453 | int debug_object_activate(void *addr, struct debug_obj_descr *descr) |
3ac7fe5a TG |
454 | { |
455 | enum debug_obj_state state; | |
456 | struct debug_bucket *db; | |
457 | struct debug_obj *obj; | |
458 | unsigned long flags; | |
b778ae25 | 459 | int ret; |
feac18dd SB |
460 | struct debug_obj o = { .object = addr, |
461 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
462 | .descr = descr }; | |
3ac7fe5a TG |
463 | |
464 | if (!debug_objects_enabled) | |
b778ae25 | 465 | return 0; |
3ac7fe5a TG |
466 | |
467 | db = get_bucket((unsigned long) addr); | |
468 | ||
aef9cb05 | 469 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
470 | |
471 | obj = lookup_object(addr, db); | |
472 | if (obj) { | |
473 | switch (obj->state) { | |
474 | case ODEBUG_STATE_INIT: | |
475 | case ODEBUG_STATE_INACTIVE: | |
476 | obj->state = ODEBUG_STATE_ACTIVE; | |
b778ae25 | 477 | ret = 0; |
3ac7fe5a TG |
478 | break; |
479 | ||
480 | case ODEBUG_STATE_ACTIVE: | |
481 | debug_print_object(obj, "activate"); | |
482 | state = obj->state; | |
aef9cb05 | 483 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 484 | ret = debug_object_fixup(descr->fixup_activate, addr, state); |
e7a8e78b | 485 | return ret ? 0 : -EINVAL; |
3ac7fe5a TG |
486 | |
487 | case ODEBUG_STATE_DESTROYED: | |
488 | debug_print_object(obj, "activate"); | |
b778ae25 | 489 | ret = -EINVAL; |
3ac7fe5a TG |
490 | break; |
491 | default: | |
b778ae25 | 492 | ret = 0; |
3ac7fe5a TG |
493 | break; |
494 | } | |
aef9cb05 | 495 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 496 | return ret; |
3ac7fe5a TG |
497 | } |
498 | ||
aef9cb05 | 499 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 500 | /* |
b9fdac7f DC |
501 | * We are here when a static object is activated. We |
502 | * let the type specific code confirm whether this is | |
503 | * true or not. if true, we just make sure that the | |
504 | * static object is tracked in the object tracker. If | |
505 | * not, this must be a bug, so we try to fix it up. | |
3ac7fe5a | 506 | */ |
b9fdac7f DC |
507 | if (descr->is_static_object && descr->is_static_object(addr)) { |
508 | /* track this static object */ | |
509 | debug_object_init(addr, descr); | |
510 | debug_object_activate(addr, descr); | |
511 | } else { | |
feac18dd | 512 | debug_print_object(&o, "activate"); |
b9fdac7f DC |
513 | ret = debug_object_fixup(descr->fixup_activate, addr, |
514 | ODEBUG_STATE_NOTAVAILABLE); | |
515 | return ret ? 0 : -EINVAL; | |
b778ae25 PM |
516 | } |
517 | return 0; | |
3ac7fe5a | 518 | } |
f8ff04e2 | 519 | EXPORT_SYMBOL_GPL(debug_object_activate); |
3ac7fe5a TG |
520 | |
521 | /** | |
522 | * debug_object_deactivate - debug checks when an object is deactivated | |
523 | * @addr: address of the object | |
524 | * @descr: pointer to an object specific debug description structure | |
525 | */ | |
526 | void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) | |
527 | { | |
528 | struct debug_bucket *db; | |
529 | struct debug_obj *obj; | |
530 | unsigned long flags; | |
531 | ||
532 | if (!debug_objects_enabled) | |
533 | return; | |
534 | ||
535 | db = get_bucket((unsigned long) addr); | |
536 | ||
aef9cb05 | 537 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
538 | |
539 | obj = lookup_object(addr, db); | |
540 | if (obj) { | |
541 | switch (obj->state) { | |
542 | case ODEBUG_STATE_INIT: | |
543 | case ODEBUG_STATE_INACTIVE: | |
544 | case ODEBUG_STATE_ACTIVE: | |
a5d8e467 MD |
545 | if (!obj->astate) |
546 | obj->state = ODEBUG_STATE_INACTIVE; | |
547 | else | |
548 | debug_print_object(obj, "deactivate"); | |
3ac7fe5a TG |
549 | break; |
550 | ||
551 | case ODEBUG_STATE_DESTROYED: | |
552 | debug_print_object(obj, "deactivate"); | |
553 | break; | |
554 | default: | |
555 | break; | |
556 | } | |
557 | } else { | |
558 | struct debug_obj o = { .object = addr, | |
559 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
560 | .descr = descr }; | |
561 | ||
562 | debug_print_object(&o, "deactivate"); | |
563 | } | |
564 | ||
aef9cb05 | 565 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 566 | } |
f8ff04e2 | 567 | EXPORT_SYMBOL_GPL(debug_object_deactivate); |
3ac7fe5a TG |
568 | |
569 | /** | |
570 | * debug_object_destroy - debug checks when an object is destroyed | |
571 | * @addr: address of the object | |
572 | * @descr: pointer to an object specific debug description structure | |
573 | */ | |
574 | void debug_object_destroy(void *addr, struct debug_obj_descr *descr) | |
575 | { | |
576 | enum debug_obj_state state; | |
577 | struct debug_bucket *db; | |
578 | struct debug_obj *obj; | |
579 | unsigned long flags; | |
580 | ||
581 | if (!debug_objects_enabled) | |
582 | return; | |
583 | ||
584 | db = get_bucket((unsigned long) addr); | |
585 | ||
aef9cb05 | 586 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
587 | |
588 | obj = lookup_object(addr, db); | |
589 | if (!obj) | |
590 | goto out_unlock; | |
591 | ||
592 | switch (obj->state) { | |
593 | case ODEBUG_STATE_NONE: | |
594 | case ODEBUG_STATE_INIT: | |
595 | case ODEBUG_STATE_INACTIVE: | |
596 | obj->state = ODEBUG_STATE_DESTROYED; | |
597 | break; | |
598 | case ODEBUG_STATE_ACTIVE: | |
599 | debug_print_object(obj, "destroy"); | |
600 | state = obj->state; | |
aef9cb05 | 601 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
602 | debug_object_fixup(descr->fixup_destroy, addr, state); |
603 | return; | |
604 | ||
605 | case ODEBUG_STATE_DESTROYED: | |
606 | debug_print_object(obj, "destroy"); | |
607 | break; | |
608 | default: | |
609 | break; | |
610 | } | |
611 | out_unlock: | |
aef9cb05 | 612 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 613 | } |
f8ff04e2 | 614 | EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a TG |
615 | |
616 | /** | |
617 | * debug_object_free - debug checks when an object is freed | |
618 | * @addr: address of the object | |
619 | * @descr: pointer to an object specific debug description structure | |
620 | */ | |
621 | void debug_object_free(void *addr, struct debug_obj_descr *descr) | |
622 | { | |
623 | enum debug_obj_state state; | |
624 | struct debug_bucket *db; | |
625 | struct debug_obj *obj; | |
626 | unsigned long flags; | |
627 | ||
628 | if (!debug_objects_enabled) | |
629 | return; | |
630 | ||
631 | db = get_bucket((unsigned long) addr); | |
632 | ||
aef9cb05 | 633 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
634 | |
635 | obj = lookup_object(addr, db); | |
636 | if (!obj) | |
637 | goto out_unlock; | |
638 | ||
639 | switch (obj->state) { | |
640 | case ODEBUG_STATE_ACTIVE: | |
641 | debug_print_object(obj, "free"); | |
642 | state = obj->state; | |
aef9cb05 | 643 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
644 | debug_object_fixup(descr->fixup_free, addr, state); |
645 | return; | |
646 | default: | |
647 | hlist_del(&obj->node); | |
aef9cb05 | 648 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 649 | free_object(obj); |
673d62cc | 650 | return; |
3ac7fe5a TG |
651 | } |
652 | out_unlock: | |
aef9cb05 | 653 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 654 | } |
f8ff04e2 | 655 | EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a | 656 | |
b84d435c CC |
657 | /** |
658 | * debug_object_assert_init - debug checks when object should be init-ed | |
659 | * @addr: address of the object | |
660 | * @descr: pointer to an object specific debug description structure | |
661 | */ | |
662 | void debug_object_assert_init(void *addr, struct debug_obj_descr *descr) | |
663 | { | |
664 | struct debug_bucket *db; | |
665 | struct debug_obj *obj; | |
666 | unsigned long flags; | |
667 | ||
668 | if (!debug_objects_enabled) | |
669 | return; | |
670 | ||
671 | db = get_bucket((unsigned long) addr); | |
672 | ||
673 | raw_spin_lock_irqsave(&db->lock, flags); | |
674 | ||
675 | obj = lookup_object(addr, db); | |
676 | if (!obj) { | |
677 | struct debug_obj o = { .object = addr, | |
678 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
679 | .descr = descr }; | |
680 | ||
681 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
682 | /* | |
b9fdac7f DC |
683 | * Maybe the object is static, and we let the type specific |
684 | * code confirm. Track this static object if true, else invoke | |
685 | * fixup. | |
b84d435c | 686 | */ |
b9fdac7f DC |
687 | if (descr->is_static_object && descr->is_static_object(addr)) { |
688 | /* Track this static object */ | |
689 | debug_object_init(addr, descr); | |
690 | } else { | |
b84d435c | 691 | debug_print_object(&o, "assert_init"); |
b9fdac7f DC |
692 | debug_object_fixup(descr->fixup_assert_init, addr, |
693 | ODEBUG_STATE_NOTAVAILABLE); | |
694 | } | |
b84d435c CC |
695 | return; |
696 | } | |
697 | ||
698 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
699 | } | |
f8ff04e2 | 700 | EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435c | 701 | |
a5d8e467 MD |
702 | /** |
703 | * debug_object_active_state - debug checks object usage state machine | |
704 | * @addr: address of the object | |
705 | * @descr: pointer to an object specific debug description structure | |
706 | * @expect: expected state | |
707 | * @next: state to move to if expected state is found | |
708 | */ | |
709 | void | |
710 | debug_object_active_state(void *addr, struct debug_obj_descr *descr, | |
711 | unsigned int expect, unsigned int next) | |
712 | { | |
713 | struct debug_bucket *db; | |
714 | struct debug_obj *obj; | |
715 | unsigned long flags; | |
716 | ||
717 | if (!debug_objects_enabled) | |
718 | return; | |
719 | ||
720 | db = get_bucket((unsigned long) addr); | |
721 | ||
722 | raw_spin_lock_irqsave(&db->lock, flags); | |
723 | ||
724 | obj = lookup_object(addr, db); | |
725 | if (obj) { | |
726 | switch (obj->state) { | |
727 | case ODEBUG_STATE_ACTIVE: | |
728 | if (obj->astate == expect) | |
729 | obj->astate = next; | |
730 | else | |
731 | debug_print_object(obj, "active_state"); | |
732 | break; | |
733 | ||
734 | default: | |
735 | debug_print_object(obj, "active_state"); | |
736 | break; | |
737 | } | |
738 | } else { | |
739 | struct debug_obj o = { .object = addr, | |
740 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
741 | .descr = descr }; | |
742 | ||
743 | debug_print_object(&o, "active_state"); | |
744 | } | |
745 | ||
746 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
747 | } | |
f8ff04e2 | 748 | EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467 | 749 | |
3ac7fe5a TG |
750 | #ifdef CONFIG_DEBUG_OBJECTS_FREE |
751 | static void __debug_check_no_obj_freed(const void *address, unsigned long size) | |
752 | { | |
753 | unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; | |
3ac7fe5a TG |
754 | struct debug_obj_descr *descr; |
755 | enum debug_obj_state state; | |
756 | struct debug_bucket *db; | |
1ea9b98b | 757 | struct hlist_node *tmp; |
3ac7fe5a | 758 | struct debug_obj *obj; |
bd9dcd04 | 759 | int cnt, objs_checked = 0; |
1ea9b98b | 760 | bool work = false; |
3ac7fe5a TG |
761 | |
762 | saddr = (unsigned long) address; | |
763 | eaddr = saddr + size; | |
764 | paddr = saddr & ODEBUG_CHUNK_MASK; | |
765 | chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); | |
766 | chunks >>= ODEBUG_CHUNK_SHIFT; | |
767 | ||
768 | for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { | |
769 | db = get_bucket(paddr); | |
770 | ||
771 | repeat: | |
772 | cnt = 0; | |
aef9cb05 | 773 | raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d | 774 | hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a TG |
775 | cnt++; |
776 | oaddr = (unsigned long) obj->object; | |
777 | if (oaddr < saddr || oaddr >= eaddr) | |
778 | continue; | |
779 | ||
780 | switch (obj->state) { | |
781 | case ODEBUG_STATE_ACTIVE: | |
782 | debug_print_object(obj, "free"); | |
783 | descr = obj->descr; | |
784 | state = obj->state; | |
aef9cb05 | 785 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
786 | debug_object_fixup(descr->fixup_free, |
787 | (void *) oaddr, state); | |
788 | goto repeat; | |
789 | default: | |
790 | hlist_del(&obj->node); | |
1ea9b98b | 791 | work |= __free_object(obj); |
3ac7fe5a TG |
792 | break; |
793 | } | |
794 | } | |
aef9cb05 | 795 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc | 796 | |
3ac7fe5a TG |
797 | if (cnt > debug_objects_maxchain) |
798 | debug_objects_maxchain = cnt; | |
bd9dcd04 YS |
799 | |
800 | objs_checked += cnt; | |
3ac7fe5a | 801 | } |
bd9dcd04 YS |
802 | |
803 | if (objs_checked > debug_objects_maxchecked) | |
804 | debug_objects_maxchecked = objs_checked; | |
1ea9b98b YS |
805 | |
806 | /* Schedule work to actually kmem_cache_free() objects */ | |
807 | if (work) | |
808 | schedule_work(&debug_obj_work); | |
3ac7fe5a TG |
809 | } |
810 | ||
811 | void debug_check_no_obj_freed(const void *address, unsigned long size) | |
812 | { | |
813 | if (debug_objects_enabled) | |
814 | __debug_check_no_obj_freed(address, size); | |
815 | } | |
816 | #endif | |
817 | ||
818 | #ifdef CONFIG_DEBUG_FS | |
819 | ||
820 | static int debug_stats_show(struct seq_file *m, void *v) | |
821 | { | |
822 | seq_printf(m, "max_chain :%d\n", debug_objects_maxchain); | |
bd9dcd04 | 823 | seq_printf(m, "max_checked :%d\n", debug_objects_maxchecked); |
3ac7fe5a TG |
824 | seq_printf(m, "warnings :%d\n", debug_objects_warnings); |
825 | seq_printf(m, "fixups :%d\n", debug_objects_fixups); | |
826 | seq_printf(m, "pool_free :%d\n", obj_pool_free); | |
827 | seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free); | |
828 | seq_printf(m, "pool_used :%d\n", obj_pool_used); | |
829 | seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used); | |
36c4ead6 | 830 | seq_printf(m, "on_free_list :%d\n", obj_nr_tofree); |
0cad93c3 WL |
831 | seq_printf(m, "objs_allocated:%d\n", debug_objects_allocated); |
832 | seq_printf(m, "objs_freed :%d\n", debug_objects_freed); | |
3ac7fe5a TG |
833 | return 0; |
834 | } | |
835 | ||
836 | static int debug_stats_open(struct inode *inode, struct file *filp) | |
837 | { | |
838 | return single_open(filp, debug_stats_show, NULL); | |
839 | } | |
840 | ||
841 | static const struct file_operations debug_stats_fops = { | |
842 | .open = debug_stats_open, | |
843 | .read = seq_read, | |
844 | .llseek = seq_lseek, | |
845 | .release = single_release, | |
846 | }; | |
847 | ||
848 | static int __init debug_objects_init_debugfs(void) | |
849 | { | |
850 | struct dentry *dbgdir, *dbgstats; | |
851 | ||
852 | if (!debug_objects_enabled) | |
853 | return 0; | |
854 | ||
855 | dbgdir = debugfs_create_dir("debug_objects", NULL); | |
856 | if (!dbgdir) | |
857 | return -ENOMEM; | |
858 | ||
859 | dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL, | |
860 | &debug_stats_fops); | |
861 | if (!dbgstats) | |
862 | goto err; | |
863 | ||
864 | return 0; | |
865 | ||
866 | err: | |
867 | debugfs_remove(dbgdir); | |
868 | ||
869 | return -ENOMEM; | |
870 | } | |
871 | __initcall(debug_objects_init_debugfs); | |
872 | ||
873 | #else | |
874 | static inline void debug_objects_init_debugfs(void) { } | |
875 | #endif | |
876 | ||
877 | #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST | |
878 | ||
879 | /* Random data structure for the self test */ | |
880 | struct self_test { | |
881 | unsigned long dummy1[6]; | |
882 | int static_init; | |
883 | unsigned long dummy2[3]; | |
884 | }; | |
885 | ||
886 | static __initdata struct debug_obj_descr descr_type_test; | |
887 | ||
b9fdac7f DC |
888 | static bool __init is_static_object(void *addr) |
889 | { | |
890 | struct self_test *obj = addr; | |
891 | ||
892 | return obj->static_init; | |
893 | } | |
894 | ||
3ac7fe5a TG |
895 | /* |
896 | * fixup_init is called when: | |
897 | * - an active object is initialized | |
898 | */ | |
b1e4d9d8 | 899 | static bool __init fixup_init(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_init(obj, &descr_type_test); | |
b1e4d9d8 | 907 | return true; |
3ac7fe5a | 908 | default: |
b1e4d9d8 | 909 | return false; |
3ac7fe5a TG |
910 | } |
911 | } | |
912 | ||
913 | /* | |
914 | * fixup_activate is called when: | |
915 | * - an active object is activated | |
b9fdac7f | 916 | * - an unknown non-static object is activated |
3ac7fe5a | 917 | */ |
b1e4d9d8 | 918 | static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
919 | { |
920 | struct self_test *obj = addr; | |
921 | ||
922 | switch (state) { | |
923 | case ODEBUG_STATE_NOTAVAILABLE: | |
b1e4d9d8 | 924 | return true; |
3ac7fe5a TG |
925 | case ODEBUG_STATE_ACTIVE: |
926 | debug_object_deactivate(obj, &descr_type_test); | |
927 | debug_object_activate(obj, &descr_type_test); | |
b1e4d9d8 | 928 | return true; |
3ac7fe5a TG |
929 | |
930 | default: | |
b1e4d9d8 | 931 | return false; |
3ac7fe5a TG |
932 | } |
933 | } | |
934 | ||
935 | /* | |
936 | * fixup_destroy is called when: | |
937 | * - an active object is destroyed | |
938 | */ | |
b1e4d9d8 | 939 | static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
940 | { |
941 | struct self_test *obj = addr; | |
942 | ||
943 | switch (state) { | |
944 | case ODEBUG_STATE_ACTIVE: | |
945 | debug_object_deactivate(obj, &descr_type_test); | |
946 | debug_object_destroy(obj, &descr_type_test); | |
b1e4d9d8 | 947 | return true; |
3ac7fe5a | 948 | default: |
b1e4d9d8 | 949 | return false; |
3ac7fe5a TG |
950 | } |
951 | } | |
952 | ||
953 | /* | |
954 | * fixup_free is called when: | |
955 | * - an active object is freed | |
956 | */ | |
b1e4d9d8 | 957 | static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
958 | { |
959 | struct self_test *obj = addr; | |
960 | ||
961 | switch (state) { | |
962 | case ODEBUG_STATE_ACTIVE: | |
963 | debug_object_deactivate(obj, &descr_type_test); | |
964 | debug_object_free(obj, &descr_type_test); | |
b1e4d9d8 | 965 | return true; |
3ac7fe5a | 966 | default: |
b1e4d9d8 | 967 | return false; |
3ac7fe5a TG |
968 | } |
969 | } | |
970 | ||
1fb2f77c | 971 | static int __init |
3ac7fe5a TG |
972 | check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) |
973 | { | |
974 | struct debug_bucket *db; | |
975 | struct debug_obj *obj; | |
976 | unsigned long flags; | |
977 | int res = -EINVAL; | |
978 | ||
979 | db = get_bucket((unsigned long) addr); | |
980 | ||
aef9cb05 | 981 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
982 | |
983 | obj = lookup_object(addr, db); | |
984 | if (!obj && state != ODEBUG_STATE_NONE) { | |
5cd2b459 | 985 | WARN(1, KERN_ERR "ODEBUG: selftest object not found\n"); |
3ac7fe5a TG |
986 | goto out; |
987 | } | |
988 | if (obj && obj->state != state) { | |
5cd2b459 | 989 | WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n", |
3ac7fe5a | 990 | obj->state, state); |
3ac7fe5a TG |
991 | goto out; |
992 | } | |
993 | if (fixups != debug_objects_fixups) { | |
5cd2b459 | 994 | WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n", |
3ac7fe5a | 995 | fixups, debug_objects_fixups); |
3ac7fe5a TG |
996 | goto out; |
997 | } | |
998 | if (warnings != debug_objects_warnings) { | |
5cd2b459 | 999 | WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n", |
3ac7fe5a | 1000 | warnings, debug_objects_warnings); |
3ac7fe5a TG |
1001 | goto out; |
1002 | } | |
1003 | res = 0; | |
1004 | out: | |
aef9cb05 | 1005 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
1006 | if (res) |
1007 | debug_objects_enabled = 0; | |
1008 | return res; | |
1009 | } | |
1010 | ||
1011 | static __initdata struct debug_obj_descr descr_type_test = { | |
1012 | .name = "selftest", | |
b9fdac7f | 1013 | .is_static_object = is_static_object, |
3ac7fe5a TG |
1014 | .fixup_init = fixup_init, |
1015 | .fixup_activate = fixup_activate, | |
1016 | .fixup_destroy = fixup_destroy, | |
1017 | .fixup_free = fixup_free, | |
1018 | }; | |
1019 | ||
1020 | static __initdata struct self_test obj = { .static_init = 0 }; | |
1021 | ||
1022 | static void __init debug_objects_selftest(void) | |
1023 | { | |
1024 | int fixups, oldfixups, warnings, oldwarnings; | |
1025 | unsigned long flags; | |
1026 | ||
1027 | local_irq_save(flags); | |
1028 | ||
1029 | fixups = oldfixups = debug_objects_fixups; | |
1030 | warnings = oldwarnings = debug_objects_warnings; | |
1031 | descr_test = &descr_type_test; | |
1032 | ||
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_object_activate(&obj, &descr_type_test); | |
1040 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) | |
1041 | goto out; | |
1042 | debug_object_deactivate(&obj, &descr_type_test); | |
1043 | if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) | |
1044 | goto out; | |
1045 | debug_object_destroy(&obj, &descr_type_test); | |
1046 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) | |
1047 | goto out; | |
1048 | debug_object_init(&obj, &descr_type_test); | |
1049 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1050 | goto out; | |
1051 | debug_object_activate(&obj, &descr_type_test); | |
1052 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1053 | goto out; | |
1054 | debug_object_deactivate(&obj, &descr_type_test); | |
1055 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1056 | goto out; | |
1057 | debug_object_free(&obj, &descr_type_test); | |
1058 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1059 | goto out; | |
1060 | ||
1061 | obj.static_init = 1; | |
1062 | debug_object_activate(&obj, &descr_type_test); | |
9f78ff00 | 1063 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a TG |
1064 | goto out; |
1065 | debug_object_init(&obj, &descr_type_test); | |
1066 | if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) | |
1067 | goto out; | |
1068 | debug_object_free(&obj, &descr_type_test); | |
1069 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1070 | goto out; | |
1071 | ||
1072 | #ifdef CONFIG_DEBUG_OBJECTS_FREE | |
1073 | debug_object_init(&obj, &descr_type_test); | |
1074 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
1075 | goto out; | |
1076 | debug_object_activate(&obj, &descr_type_test); | |
1077 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
1078 | goto out; | |
1079 | __debug_check_no_obj_freed(&obj, sizeof(obj)); | |
1080 | if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) | |
1081 | goto out; | |
1082 | #endif | |
719e4843 | 1083 | pr_info("selftest passed\n"); |
3ac7fe5a TG |
1084 | |
1085 | out: | |
1086 | debug_objects_fixups = oldfixups; | |
1087 | debug_objects_warnings = oldwarnings; | |
1088 | descr_test = NULL; | |
1089 | ||
1090 | local_irq_restore(flags); | |
1091 | } | |
1092 | #else | |
1093 | static inline void debug_objects_selftest(void) { } | |
1094 | #endif | |
1095 | ||
1096 | /* | |
1097 | * Called during early boot to initialize the hash buckets and link | |
1098 | * the static object pool objects into the poll list. After this call | |
1099 | * the object tracker is fully operational. | |
1100 | */ | |
1101 | void __init debug_objects_early_init(void) | |
1102 | { | |
1103 | int i; | |
1104 | ||
1105 | for (i = 0; i < ODEBUG_HASH_SIZE; i++) | |
aef9cb05 | 1106 | raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a TG |
1107 | |
1108 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) | |
1109 | hlist_add_head(&obj_static_pool[i].node, &obj_pool); | |
1110 | } | |
1111 | ||
1be1cb7b TG |
1112 | /* |
1113 | * Convert the statically allocated objects to dynamic ones: | |
1114 | */ | |
1fb2f77c | 1115 | static int __init debug_objects_replace_static_objects(void) |
1be1cb7b TG |
1116 | { |
1117 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 1118 | struct hlist_node *tmp; |
1be1cb7b TG |
1119 | struct debug_obj *obj, *new; |
1120 | HLIST_HEAD(objects); | |
1121 | int i, cnt = 0; | |
1122 | ||
1123 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) { | |
1124 | obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); | |
1125 | if (!obj) | |
1126 | goto free; | |
caba4cbb | 1127 | kmemleak_ignore(obj); |
1be1cb7b TG |
1128 | hlist_add_head(&obj->node, &objects); |
1129 | } | |
1130 | ||
1131 | /* | |
1132 | * When debug_objects_mem_init() is called we know that only | |
1133 | * one CPU is up, so disabling interrupts is enough | |
1134 | * protection. This avoids the lockdep hell of lock ordering. | |
1135 | */ | |
1136 | local_irq_disable(); | |
1137 | ||
1138 | /* Remove the statically allocated objects from the pool */ | |
b67bfe0d | 1139 | hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b TG |
1140 | hlist_del(&obj->node); |
1141 | /* Move the allocated objects to the pool */ | |
1142 | hlist_move_list(&objects, &obj_pool); | |
1143 | ||
1144 | /* Replace the active object references */ | |
1145 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
1146 | hlist_move_list(&db->list, &objects); | |
1147 | ||
b67bfe0d | 1148 | hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b TG |
1149 | new = hlist_entry(obj_pool.first, typeof(*obj), node); |
1150 | hlist_del(&new->node); | |
1151 | /* copy object data */ | |
1152 | *new = *obj; | |
1153 | hlist_add_head(&new->node, &db->list); | |
1154 | cnt++; | |
1155 | } | |
1156 | } | |
765a5e0c | 1157 | local_irq_enable(); |
1be1cb7b | 1158 | |
c0f35cc0 FF |
1159 | pr_debug("%d of %d active objects replaced\n", |
1160 | cnt, obj_pool_used); | |
1be1cb7b TG |
1161 | return 0; |
1162 | free: | |
b67bfe0d | 1163 | hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b TG |
1164 | hlist_del(&obj->node); |
1165 | kmem_cache_free(obj_cache, obj); | |
1166 | } | |
1167 | return -ENOMEM; | |
1168 | } | |
1169 | ||
3ac7fe5a TG |
1170 | /* |
1171 | * Called after the kmem_caches are functional to setup a dedicated | |
1172 | * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag | |
1173 | * prevents that the debug code is called on kmem_cache_free() for the | |
1174 | * debug tracker objects to avoid recursive calls. | |
1175 | */ | |
1176 | void __init debug_objects_mem_init(void) | |
1177 | { | |
1178 | if (!debug_objects_enabled) | |
1179 | return; | |
1180 | ||
1181 | obj_cache = kmem_cache_create("debug_objects_cache", | |
1182 | sizeof (struct debug_obj), 0, | |
1183 | SLAB_DEBUG_OBJECTS, NULL); | |
1184 | ||
1be1cb7b | 1185 | if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a | 1186 | debug_objects_enabled = 0; |
1be1cb7b TG |
1187 | if (obj_cache) |
1188 | kmem_cache_destroy(obj_cache); | |
719e4843 | 1189 | pr_warn("out of memory.\n"); |
1be1cb7b | 1190 | } else |
3ac7fe5a | 1191 | debug_objects_selftest(); |
97dd552e WL |
1192 | |
1193 | /* | |
1194 | * Increase the thresholds for allocating and freeing objects | |
1195 | * according to the number of possible CPUs available in the system. | |
1196 | */ | |
1197 | debug_objects_pool_size += num_possible_cpus() * 32; | |
1198 | debug_objects_pool_min_level += num_possible_cpus() * 4; | |
3ac7fe5a | 1199 | } |