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) | |
fc91a3c4 JFG |
363 | pr_warn("object %p is on stack %p, but NOT annotated.\n", addr, |
364 | task_stack_page(current)); | |
3ac7fe5a | 365 | else |
fc91a3c4 JFG |
366 | pr_warn("object %p is NOT on stack %p, but annotated.\n", addr, |
367 | task_stack_page(current)); | |
368 | ||
3ac7fe5a TG |
369 | WARN_ON(1); |
370 | } | |
371 | ||
372 | static void | |
373 | __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) | |
374 | { | |
375 | enum debug_obj_state state; | |
376 | struct debug_bucket *db; | |
377 | struct debug_obj *obj; | |
378 | unsigned long flags; | |
379 | ||
50db04dd VN |
380 | fill_pool(); |
381 | ||
3ac7fe5a TG |
382 | db = get_bucket((unsigned long) addr); |
383 | ||
aef9cb05 | 384 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
385 | |
386 | obj = lookup_object(addr, db); | |
387 | if (!obj) { | |
388 | obj = alloc_object(addr, db, descr); | |
389 | if (!obj) { | |
390 | debug_objects_enabled = 0; | |
aef9cb05 | 391 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
392 | debug_objects_oom(); |
393 | return; | |
394 | } | |
395 | debug_object_is_on_stack(addr, onstack); | |
396 | } | |
397 | ||
398 | switch (obj->state) { | |
399 | case ODEBUG_STATE_NONE: | |
400 | case ODEBUG_STATE_INIT: | |
401 | case ODEBUG_STATE_INACTIVE: | |
402 | obj->state = ODEBUG_STATE_INIT; | |
403 | break; | |
404 | ||
405 | case ODEBUG_STATE_ACTIVE: | |
406 | debug_print_object(obj, "init"); | |
407 | state = obj->state; | |
aef9cb05 | 408 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
409 | debug_object_fixup(descr->fixup_init, addr, state); |
410 | return; | |
411 | ||
412 | case ODEBUG_STATE_DESTROYED: | |
413 | debug_print_object(obj, "init"); | |
414 | break; | |
415 | default: | |
416 | break; | |
417 | } | |
418 | ||
aef9cb05 | 419 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
420 | } |
421 | ||
422 | /** | |
423 | * debug_object_init - debug checks when an object is initialized | |
424 | * @addr: address of the object | |
425 | * @descr: pointer to an object specific debug description structure | |
426 | */ | |
427 | void debug_object_init(void *addr, struct debug_obj_descr *descr) | |
428 | { | |
429 | if (!debug_objects_enabled) | |
430 | return; | |
431 | ||
432 | __debug_object_init(addr, descr, 0); | |
433 | } | |
f8ff04e2 | 434 | EXPORT_SYMBOL_GPL(debug_object_init); |
3ac7fe5a TG |
435 | |
436 | /** | |
437 | * debug_object_init_on_stack - debug checks when an object on stack is | |
438 | * initialized | |
439 | * @addr: address of the object | |
440 | * @descr: pointer to an object specific debug description structure | |
441 | */ | |
442 | void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) | |
443 | { | |
444 | if (!debug_objects_enabled) | |
445 | return; | |
446 | ||
447 | __debug_object_init(addr, descr, 1); | |
448 | } | |
f8ff04e2 | 449 | EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
3ac7fe5a TG |
450 | |
451 | /** | |
452 | * debug_object_activate - debug checks when an object is activated | |
453 | * @addr: address of the object | |
454 | * @descr: pointer to an object specific debug description structure | |
b778ae25 | 455 | * Returns 0 for success, -EINVAL for check failed. |
3ac7fe5a | 456 | */ |
b778ae25 | 457 | int debug_object_activate(void *addr, struct debug_obj_descr *descr) |
3ac7fe5a TG |
458 | { |
459 | enum debug_obj_state state; | |
460 | struct debug_bucket *db; | |
461 | struct debug_obj *obj; | |
462 | unsigned long flags; | |
b778ae25 | 463 | int ret; |
feac18dd SB |
464 | struct debug_obj o = { .object = addr, |
465 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
466 | .descr = descr }; | |
3ac7fe5a TG |
467 | |
468 | if (!debug_objects_enabled) | |
b778ae25 | 469 | return 0; |
3ac7fe5a TG |
470 | |
471 | db = get_bucket((unsigned long) addr); | |
472 | ||
aef9cb05 | 473 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
474 | |
475 | obj = lookup_object(addr, db); | |
476 | if (obj) { | |
477 | switch (obj->state) { | |
478 | case ODEBUG_STATE_INIT: | |
479 | case ODEBUG_STATE_INACTIVE: | |
480 | obj->state = ODEBUG_STATE_ACTIVE; | |
b778ae25 | 481 | ret = 0; |
3ac7fe5a TG |
482 | break; |
483 | ||
484 | case ODEBUG_STATE_ACTIVE: | |
485 | debug_print_object(obj, "activate"); | |
486 | state = obj->state; | |
aef9cb05 | 487 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 488 | ret = debug_object_fixup(descr->fixup_activate, addr, state); |
e7a8e78b | 489 | return ret ? 0 : -EINVAL; |
3ac7fe5a TG |
490 | |
491 | case ODEBUG_STATE_DESTROYED: | |
492 | debug_print_object(obj, "activate"); | |
b778ae25 | 493 | ret = -EINVAL; |
3ac7fe5a TG |
494 | break; |
495 | default: | |
b778ae25 | 496 | ret = 0; |
3ac7fe5a TG |
497 | break; |
498 | } | |
aef9cb05 | 499 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 500 | return ret; |
3ac7fe5a TG |
501 | } |
502 | ||
aef9cb05 | 503 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 504 | /* |
b9fdac7f DC |
505 | * We are here when a static object is activated. We |
506 | * let the type specific code confirm whether this is | |
507 | * true or not. if true, we just make sure that the | |
508 | * static object is tracked in the object tracker. If | |
509 | * not, this must be a bug, so we try to fix it up. | |
3ac7fe5a | 510 | */ |
b9fdac7f DC |
511 | if (descr->is_static_object && descr->is_static_object(addr)) { |
512 | /* track this static object */ | |
513 | debug_object_init(addr, descr); | |
514 | debug_object_activate(addr, descr); | |
515 | } else { | |
feac18dd | 516 | debug_print_object(&o, "activate"); |
b9fdac7f DC |
517 | ret = debug_object_fixup(descr->fixup_activate, addr, |
518 | ODEBUG_STATE_NOTAVAILABLE); | |
519 | return ret ? 0 : -EINVAL; | |
b778ae25 PM |
520 | } |
521 | return 0; | |
3ac7fe5a | 522 | } |
f8ff04e2 | 523 | EXPORT_SYMBOL_GPL(debug_object_activate); |
3ac7fe5a TG |
524 | |
525 | /** | |
526 | * debug_object_deactivate - debug checks when an object is deactivated | |
527 | * @addr: address of the object | |
528 | * @descr: pointer to an object specific debug description structure | |
529 | */ | |
530 | void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) | |
531 | { | |
532 | struct debug_bucket *db; | |
533 | struct debug_obj *obj; | |
534 | unsigned long flags; | |
535 | ||
536 | if (!debug_objects_enabled) | |
537 | return; | |
538 | ||
539 | db = get_bucket((unsigned long) addr); | |
540 | ||
aef9cb05 | 541 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
542 | |
543 | obj = lookup_object(addr, db); | |
544 | if (obj) { | |
545 | switch (obj->state) { | |
546 | case ODEBUG_STATE_INIT: | |
547 | case ODEBUG_STATE_INACTIVE: | |
548 | case ODEBUG_STATE_ACTIVE: | |
a5d8e467 MD |
549 | if (!obj->astate) |
550 | obj->state = ODEBUG_STATE_INACTIVE; | |
551 | else | |
552 | debug_print_object(obj, "deactivate"); | |
3ac7fe5a TG |
553 | break; |
554 | ||
555 | case ODEBUG_STATE_DESTROYED: | |
556 | debug_print_object(obj, "deactivate"); | |
557 | break; | |
558 | default: | |
559 | break; | |
560 | } | |
561 | } else { | |
562 | struct debug_obj o = { .object = addr, | |
563 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
564 | .descr = descr }; | |
565 | ||
566 | debug_print_object(&o, "deactivate"); | |
567 | } | |
568 | ||
aef9cb05 | 569 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 570 | } |
f8ff04e2 | 571 | EXPORT_SYMBOL_GPL(debug_object_deactivate); |
3ac7fe5a TG |
572 | |
573 | /** | |
574 | * debug_object_destroy - debug checks when an object is destroyed | |
575 | * @addr: address of the object | |
576 | * @descr: pointer to an object specific debug description structure | |
577 | */ | |
578 | void debug_object_destroy(void *addr, struct debug_obj_descr *descr) | |
579 | { | |
580 | enum debug_obj_state state; | |
581 | struct debug_bucket *db; | |
582 | struct debug_obj *obj; | |
583 | unsigned long flags; | |
584 | ||
585 | if (!debug_objects_enabled) | |
586 | return; | |
587 | ||
588 | db = get_bucket((unsigned long) addr); | |
589 | ||
aef9cb05 | 590 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
591 | |
592 | obj = lookup_object(addr, db); | |
593 | if (!obj) | |
594 | goto out_unlock; | |
595 | ||
596 | switch (obj->state) { | |
597 | case ODEBUG_STATE_NONE: | |
598 | case ODEBUG_STATE_INIT: | |
599 | case ODEBUG_STATE_INACTIVE: | |
600 | obj->state = ODEBUG_STATE_DESTROYED; | |
601 | break; | |
602 | case ODEBUG_STATE_ACTIVE: | |
603 | debug_print_object(obj, "destroy"); | |
604 | state = obj->state; | |
aef9cb05 | 605 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
606 | debug_object_fixup(descr->fixup_destroy, addr, state); |
607 | return; | |
608 | ||
609 | case ODEBUG_STATE_DESTROYED: | |
610 | debug_print_object(obj, "destroy"); | |
611 | break; | |
612 | default: | |
613 | break; | |
614 | } | |
615 | out_unlock: | |
aef9cb05 | 616 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 617 | } |
f8ff04e2 | 618 | EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a TG |
619 | |
620 | /** | |
621 | * debug_object_free - debug checks when an object is freed | |
622 | * @addr: address of the object | |
623 | * @descr: pointer to an object specific debug description structure | |
624 | */ | |
625 | void debug_object_free(void *addr, struct debug_obj_descr *descr) | |
626 | { | |
627 | enum debug_obj_state state; | |
628 | struct debug_bucket *db; | |
629 | struct debug_obj *obj; | |
630 | unsigned long flags; | |
631 | ||
632 | if (!debug_objects_enabled) | |
633 | return; | |
634 | ||
635 | db = get_bucket((unsigned long) addr); | |
636 | ||
aef9cb05 | 637 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
638 | |
639 | obj = lookup_object(addr, db); | |
640 | if (!obj) | |
641 | goto out_unlock; | |
642 | ||
643 | switch (obj->state) { | |
644 | case ODEBUG_STATE_ACTIVE: | |
645 | debug_print_object(obj, "free"); | |
646 | state = obj->state; | |
aef9cb05 | 647 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
648 | debug_object_fixup(descr->fixup_free, addr, state); |
649 | return; | |
650 | default: | |
651 | hlist_del(&obj->node); | |
aef9cb05 | 652 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 653 | free_object(obj); |
673d62cc | 654 | return; |
3ac7fe5a TG |
655 | } |
656 | out_unlock: | |
aef9cb05 | 657 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 658 | } |
f8ff04e2 | 659 | EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a | 660 | |
b84d435c CC |
661 | /** |
662 | * debug_object_assert_init - debug checks when object should be init-ed | |
663 | * @addr: address of the object | |
664 | * @descr: pointer to an object specific debug description structure | |
665 | */ | |
666 | void debug_object_assert_init(void *addr, struct debug_obj_descr *descr) | |
667 | { | |
668 | struct debug_bucket *db; | |
669 | struct debug_obj *obj; | |
670 | unsigned long flags; | |
671 | ||
672 | if (!debug_objects_enabled) | |
673 | return; | |
674 | ||
675 | db = get_bucket((unsigned long) addr); | |
676 | ||
677 | raw_spin_lock_irqsave(&db->lock, flags); | |
678 | ||
679 | obj = lookup_object(addr, db); | |
680 | if (!obj) { | |
681 | struct debug_obj o = { .object = addr, | |
682 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
683 | .descr = descr }; | |
684 | ||
685 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
686 | /* | |
b9fdac7f DC |
687 | * Maybe the object is static, and we let the type specific |
688 | * code confirm. Track this static object if true, else invoke | |
689 | * fixup. | |
b84d435c | 690 | */ |
b9fdac7f DC |
691 | if (descr->is_static_object && descr->is_static_object(addr)) { |
692 | /* Track this static object */ | |
693 | debug_object_init(addr, descr); | |
694 | } else { | |
b84d435c | 695 | debug_print_object(&o, "assert_init"); |
b9fdac7f DC |
696 | debug_object_fixup(descr->fixup_assert_init, addr, |
697 | ODEBUG_STATE_NOTAVAILABLE); | |
698 | } | |
b84d435c CC |
699 | return; |
700 | } | |
701 | ||
702 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
703 | } | |
f8ff04e2 | 704 | EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435c | 705 | |
a5d8e467 MD |
706 | /** |
707 | * debug_object_active_state - debug checks object usage state machine | |
708 | * @addr: address of the object | |
709 | * @descr: pointer to an object specific debug description structure | |
710 | * @expect: expected state | |
711 | * @next: state to move to if expected state is found | |
712 | */ | |
713 | void | |
714 | debug_object_active_state(void *addr, struct debug_obj_descr *descr, | |
715 | unsigned int expect, unsigned int next) | |
716 | { | |
717 | struct debug_bucket *db; | |
718 | struct debug_obj *obj; | |
719 | unsigned long flags; | |
720 | ||
721 | if (!debug_objects_enabled) | |
722 | return; | |
723 | ||
724 | db = get_bucket((unsigned long) addr); | |
725 | ||
726 | raw_spin_lock_irqsave(&db->lock, flags); | |
727 | ||
728 | obj = lookup_object(addr, db); | |
729 | if (obj) { | |
730 | switch (obj->state) { | |
731 | case ODEBUG_STATE_ACTIVE: | |
732 | if (obj->astate == expect) | |
733 | obj->astate = next; | |
734 | else | |
735 | debug_print_object(obj, "active_state"); | |
736 | break; | |
737 | ||
738 | default: | |
739 | debug_print_object(obj, "active_state"); | |
740 | break; | |
741 | } | |
742 | } else { | |
743 | struct debug_obj o = { .object = addr, | |
744 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
745 | .descr = descr }; | |
746 | ||
747 | debug_print_object(&o, "active_state"); | |
748 | } | |
749 | ||
750 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
751 | } | |
f8ff04e2 | 752 | EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467 | 753 | |
3ac7fe5a TG |
754 | #ifdef CONFIG_DEBUG_OBJECTS_FREE |
755 | static void __debug_check_no_obj_freed(const void *address, unsigned long size) | |
756 | { | |
757 | unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; | |
3ac7fe5a TG |
758 | struct debug_obj_descr *descr; |
759 | enum debug_obj_state state; | |
760 | struct debug_bucket *db; | |
1ea9b98b | 761 | struct hlist_node *tmp; |
3ac7fe5a | 762 | struct debug_obj *obj; |
bd9dcd04 | 763 | int cnt, objs_checked = 0; |
1ea9b98b | 764 | bool work = false; |
3ac7fe5a TG |
765 | |
766 | saddr = (unsigned long) address; | |
767 | eaddr = saddr + size; | |
768 | paddr = saddr & ODEBUG_CHUNK_MASK; | |
769 | chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); | |
770 | chunks >>= ODEBUG_CHUNK_SHIFT; | |
771 | ||
772 | for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { | |
773 | db = get_bucket(paddr); | |
774 | ||
775 | repeat: | |
776 | cnt = 0; | |
aef9cb05 | 777 | raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d | 778 | hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a TG |
779 | cnt++; |
780 | oaddr = (unsigned long) obj->object; | |
781 | if (oaddr < saddr || oaddr >= eaddr) | |
782 | continue; | |
783 | ||
784 | switch (obj->state) { | |
785 | case ODEBUG_STATE_ACTIVE: | |
786 | debug_print_object(obj, "free"); | |
787 | descr = obj->descr; | |
788 | state = obj->state; | |
aef9cb05 | 789 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
790 | debug_object_fixup(descr->fixup_free, |
791 | (void *) oaddr, state); | |
792 | goto repeat; | |
793 | default: | |
794 | hlist_del(&obj->node); | |
1ea9b98b | 795 | work |= __free_object(obj); |
3ac7fe5a TG |
796 | break; |
797 | } | |
798 | } | |
aef9cb05 | 799 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc | 800 | |
3ac7fe5a TG |
801 | if (cnt > debug_objects_maxchain) |
802 | debug_objects_maxchain = cnt; | |
bd9dcd04 YS |
803 | |
804 | objs_checked += cnt; | |
3ac7fe5a | 805 | } |
bd9dcd04 YS |
806 | |
807 | if (objs_checked > debug_objects_maxchecked) | |
808 | debug_objects_maxchecked = objs_checked; | |
1ea9b98b YS |
809 | |
810 | /* Schedule work to actually kmem_cache_free() objects */ | |
811 | if (work) | |
812 | schedule_work(&debug_obj_work); | |
3ac7fe5a TG |
813 | } |
814 | ||
815 | void debug_check_no_obj_freed(const void *address, unsigned long size) | |
816 | { | |
817 | if (debug_objects_enabled) | |
818 | __debug_check_no_obj_freed(address, size); | |
819 | } | |
820 | #endif | |
821 | ||
822 | #ifdef CONFIG_DEBUG_FS | |
823 | ||
824 | static int debug_stats_show(struct seq_file *m, void *v) | |
825 | { | |
826 | seq_printf(m, "max_chain :%d\n", debug_objects_maxchain); | |
bd9dcd04 | 827 | seq_printf(m, "max_checked :%d\n", debug_objects_maxchecked); |
3ac7fe5a TG |
828 | seq_printf(m, "warnings :%d\n", debug_objects_warnings); |
829 | seq_printf(m, "fixups :%d\n", debug_objects_fixups); | |
830 | seq_printf(m, "pool_free :%d\n", obj_pool_free); | |
831 | seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free); | |
832 | seq_printf(m, "pool_used :%d\n", obj_pool_used); | |
833 | seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used); | |
36c4ead6 | 834 | seq_printf(m, "on_free_list :%d\n", obj_nr_tofree); |
0cad93c3 WL |
835 | seq_printf(m, "objs_allocated:%d\n", debug_objects_allocated); |
836 | seq_printf(m, "objs_freed :%d\n", debug_objects_freed); | |
3ac7fe5a TG |
837 | return 0; |
838 | } | |
839 | ||
840 | static int debug_stats_open(struct inode *inode, struct file *filp) | |
841 | { | |
842 | return single_open(filp, debug_stats_show, NULL); | |
843 | } | |
844 | ||
845 | static const struct file_operations debug_stats_fops = { | |
846 | .open = debug_stats_open, | |
847 | .read = seq_read, | |
848 | .llseek = seq_lseek, | |
849 | .release = single_release, | |
850 | }; | |
851 | ||
852 | static int __init debug_objects_init_debugfs(void) | |
853 | { | |
854 | struct dentry *dbgdir, *dbgstats; | |
855 | ||
856 | if (!debug_objects_enabled) | |
857 | return 0; | |
858 | ||
859 | dbgdir = debugfs_create_dir("debug_objects", NULL); | |
860 | if (!dbgdir) | |
861 | return -ENOMEM; | |
862 | ||
863 | dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL, | |
864 | &debug_stats_fops); | |
865 | if (!dbgstats) | |
866 | goto err; | |
867 | ||
868 | return 0; | |
869 | ||
870 | err: | |
871 | debugfs_remove(dbgdir); | |
872 | ||
873 | return -ENOMEM; | |
874 | } | |
875 | __initcall(debug_objects_init_debugfs); | |
876 | ||
877 | #else | |
878 | static inline void debug_objects_init_debugfs(void) { } | |
879 | #endif | |
880 | ||
881 | #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST | |
882 | ||
883 | /* Random data structure for the self test */ | |
884 | struct self_test { | |
885 | unsigned long dummy1[6]; | |
886 | int static_init; | |
887 | unsigned long dummy2[3]; | |
888 | }; | |
889 | ||
890 | static __initdata struct debug_obj_descr descr_type_test; | |
891 | ||
b9fdac7f DC |
892 | static bool __init is_static_object(void *addr) |
893 | { | |
894 | struct self_test *obj = addr; | |
895 | ||
896 | return obj->static_init; | |
897 | } | |
898 | ||
3ac7fe5a TG |
899 | /* |
900 | * fixup_init is called when: | |
901 | * - an active object is initialized | |
902 | */ | |
b1e4d9d8 | 903 | static bool __init fixup_init(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
904 | { |
905 | struct self_test *obj = addr; | |
906 | ||
907 | switch (state) { | |
908 | case ODEBUG_STATE_ACTIVE: | |
909 | debug_object_deactivate(obj, &descr_type_test); | |
910 | debug_object_init(obj, &descr_type_test); | |
b1e4d9d8 | 911 | return true; |
3ac7fe5a | 912 | default: |
b1e4d9d8 | 913 | return false; |
3ac7fe5a TG |
914 | } |
915 | } | |
916 | ||
917 | /* | |
918 | * fixup_activate is called when: | |
919 | * - an active object is activated | |
b9fdac7f | 920 | * - an unknown non-static object is activated |
3ac7fe5a | 921 | */ |
b1e4d9d8 | 922 | static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
923 | { |
924 | struct self_test *obj = addr; | |
925 | ||
926 | switch (state) { | |
927 | case ODEBUG_STATE_NOTAVAILABLE: | |
b1e4d9d8 | 928 | return true; |
3ac7fe5a TG |
929 | case ODEBUG_STATE_ACTIVE: |
930 | debug_object_deactivate(obj, &descr_type_test); | |
931 | debug_object_activate(obj, &descr_type_test); | |
b1e4d9d8 | 932 | return true; |
3ac7fe5a TG |
933 | |
934 | default: | |
b1e4d9d8 | 935 | return false; |
3ac7fe5a TG |
936 | } |
937 | } | |
938 | ||
939 | /* | |
940 | * fixup_destroy is called when: | |
941 | * - an active object is destroyed | |
942 | */ | |
b1e4d9d8 | 943 | static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
944 | { |
945 | struct self_test *obj = addr; | |
946 | ||
947 | switch (state) { | |
948 | case ODEBUG_STATE_ACTIVE: | |
949 | debug_object_deactivate(obj, &descr_type_test); | |
950 | debug_object_destroy(obj, &descr_type_test); | |
b1e4d9d8 | 951 | return true; |
3ac7fe5a | 952 | default: |
b1e4d9d8 | 953 | return false; |
3ac7fe5a TG |
954 | } |
955 | } | |
956 | ||
957 | /* | |
958 | * fixup_free is called when: | |
959 | * - an active object is freed | |
960 | */ | |
b1e4d9d8 | 961 | static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
962 | { |
963 | struct self_test *obj = addr; | |
964 | ||
965 | switch (state) { | |
966 | case ODEBUG_STATE_ACTIVE: | |
967 | debug_object_deactivate(obj, &descr_type_test); | |
968 | debug_object_free(obj, &descr_type_test); | |
b1e4d9d8 | 969 | return true; |
3ac7fe5a | 970 | default: |
b1e4d9d8 | 971 | return false; |
3ac7fe5a TG |
972 | } |
973 | } | |
974 | ||
1fb2f77c | 975 | static int __init |
3ac7fe5a TG |
976 | check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) |
977 | { | |
978 | struct debug_bucket *db; | |
979 | struct debug_obj *obj; | |
980 | unsigned long flags; | |
981 | int res = -EINVAL; | |
982 | ||
983 | db = get_bucket((unsigned long) addr); | |
984 | ||
aef9cb05 | 985 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
986 | |
987 | obj = lookup_object(addr, db); | |
988 | if (!obj && state != ODEBUG_STATE_NONE) { | |
5cd2b459 | 989 | WARN(1, KERN_ERR "ODEBUG: selftest object not found\n"); |
3ac7fe5a TG |
990 | goto out; |
991 | } | |
992 | if (obj && obj->state != state) { | |
5cd2b459 | 993 | WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n", |
3ac7fe5a | 994 | obj->state, state); |
3ac7fe5a TG |
995 | goto out; |
996 | } | |
997 | if (fixups != debug_objects_fixups) { | |
5cd2b459 | 998 | WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n", |
3ac7fe5a | 999 | fixups, debug_objects_fixups); |
3ac7fe5a TG |
1000 | goto out; |
1001 | } | |
1002 | if (warnings != debug_objects_warnings) { | |
5cd2b459 | 1003 | WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n", |
3ac7fe5a | 1004 | warnings, debug_objects_warnings); |
3ac7fe5a TG |
1005 | goto out; |
1006 | } | |
1007 | res = 0; | |
1008 | out: | |
aef9cb05 | 1009 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
1010 | if (res) |
1011 | debug_objects_enabled = 0; | |
1012 | return res; | |
1013 | } | |
1014 | ||
1015 | static __initdata struct debug_obj_descr descr_type_test = { | |
1016 | .name = "selftest", | |
b9fdac7f | 1017 | .is_static_object = is_static_object, |
3ac7fe5a TG |
1018 | .fixup_init = fixup_init, |
1019 | .fixup_activate = fixup_activate, | |
1020 | .fixup_destroy = fixup_destroy, | |
1021 | .fixup_free = fixup_free, | |
1022 | }; | |
1023 | ||
1024 | static __initdata struct self_test obj = { .static_init = 0 }; | |
1025 | ||
1026 | static void __init debug_objects_selftest(void) | |
1027 | { | |
1028 | int fixups, oldfixups, warnings, oldwarnings; | |
1029 | unsigned long flags; | |
1030 | ||
1031 | local_irq_save(flags); | |
1032 | ||
1033 | fixups = oldfixups = debug_objects_fixups; | |
1034 | warnings = oldwarnings = debug_objects_warnings; | |
1035 | descr_test = &descr_type_test; | |
1036 | ||
1037 | debug_object_init(&obj, &descr_type_test); | |
1038 | if (check_results(&obj, ODEBUG_STATE_INIT, 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_activate(&obj, &descr_type_test); | |
1044 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) | |
1045 | goto out; | |
1046 | debug_object_deactivate(&obj, &descr_type_test); | |
1047 | if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) | |
1048 | goto out; | |
1049 | debug_object_destroy(&obj, &descr_type_test); | |
1050 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) | |
1051 | goto out; | |
1052 | debug_object_init(&obj, &descr_type_test); | |
1053 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1054 | goto out; | |
1055 | debug_object_activate(&obj, &descr_type_test); | |
1056 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1057 | goto out; | |
1058 | debug_object_deactivate(&obj, &descr_type_test); | |
1059 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1060 | goto out; | |
1061 | debug_object_free(&obj, &descr_type_test); | |
1062 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1063 | goto out; | |
1064 | ||
1065 | obj.static_init = 1; | |
1066 | debug_object_activate(&obj, &descr_type_test); | |
9f78ff00 | 1067 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a TG |
1068 | goto out; |
1069 | debug_object_init(&obj, &descr_type_test); | |
1070 | if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) | |
1071 | goto out; | |
1072 | debug_object_free(&obj, &descr_type_test); | |
1073 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1074 | goto out; | |
1075 | ||
1076 | #ifdef CONFIG_DEBUG_OBJECTS_FREE | |
1077 | debug_object_init(&obj, &descr_type_test); | |
1078 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
1079 | goto out; | |
1080 | debug_object_activate(&obj, &descr_type_test); | |
1081 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
1082 | goto out; | |
1083 | __debug_check_no_obj_freed(&obj, sizeof(obj)); | |
1084 | if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) | |
1085 | goto out; | |
1086 | #endif | |
719e4843 | 1087 | pr_info("selftest passed\n"); |
3ac7fe5a TG |
1088 | |
1089 | out: | |
1090 | debug_objects_fixups = oldfixups; | |
1091 | debug_objects_warnings = oldwarnings; | |
1092 | descr_test = NULL; | |
1093 | ||
1094 | local_irq_restore(flags); | |
1095 | } | |
1096 | #else | |
1097 | static inline void debug_objects_selftest(void) { } | |
1098 | #endif | |
1099 | ||
1100 | /* | |
1101 | * Called during early boot to initialize the hash buckets and link | |
1102 | * the static object pool objects into the poll list. After this call | |
1103 | * the object tracker is fully operational. | |
1104 | */ | |
1105 | void __init debug_objects_early_init(void) | |
1106 | { | |
1107 | int i; | |
1108 | ||
1109 | for (i = 0; i < ODEBUG_HASH_SIZE; i++) | |
aef9cb05 | 1110 | raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a TG |
1111 | |
1112 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) | |
1113 | hlist_add_head(&obj_static_pool[i].node, &obj_pool); | |
1114 | } | |
1115 | ||
1be1cb7b TG |
1116 | /* |
1117 | * Convert the statically allocated objects to dynamic ones: | |
1118 | */ | |
1fb2f77c | 1119 | static int __init debug_objects_replace_static_objects(void) |
1be1cb7b TG |
1120 | { |
1121 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 1122 | struct hlist_node *tmp; |
1be1cb7b TG |
1123 | struct debug_obj *obj, *new; |
1124 | HLIST_HEAD(objects); | |
1125 | int i, cnt = 0; | |
1126 | ||
1127 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) { | |
1128 | obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); | |
1129 | if (!obj) | |
1130 | goto free; | |
caba4cbb | 1131 | kmemleak_ignore(obj); |
1be1cb7b TG |
1132 | hlist_add_head(&obj->node, &objects); |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * When debug_objects_mem_init() is called we know that only | |
1137 | * one CPU is up, so disabling interrupts is enough | |
1138 | * protection. This avoids the lockdep hell of lock ordering. | |
1139 | */ | |
1140 | local_irq_disable(); | |
1141 | ||
1142 | /* Remove the statically allocated objects from the pool */ | |
b67bfe0d | 1143 | hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b TG |
1144 | hlist_del(&obj->node); |
1145 | /* Move the allocated objects to the pool */ | |
1146 | hlist_move_list(&objects, &obj_pool); | |
1147 | ||
1148 | /* Replace the active object references */ | |
1149 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
1150 | hlist_move_list(&db->list, &objects); | |
1151 | ||
b67bfe0d | 1152 | hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b TG |
1153 | new = hlist_entry(obj_pool.first, typeof(*obj), node); |
1154 | hlist_del(&new->node); | |
1155 | /* copy object data */ | |
1156 | *new = *obj; | |
1157 | hlist_add_head(&new->node, &db->list); | |
1158 | cnt++; | |
1159 | } | |
1160 | } | |
765a5e0c | 1161 | local_irq_enable(); |
1be1cb7b | 1162 | |
c0f35cc0 FF |
1163 | pr_debug("%d of %d active objects replaced\n", |
1164 | cnt, obj_pool_used); | |
1be1cb7b TG |
1165 | return 0; |
1166 | free: | |
b67bfe0d | 1167 | hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b TG |
1168 | hlist_del(&obj->node); |
1169 | kmem_cache_free(obj_cache, obj); | |
1170 | } | |
1171 | return -ENOMEM; | |
1172 | } | |
1173 | ||
3ac7fe5a TG |
1174 | /* |
1175 | * Called after the kmem_caches are functional to setup a dedicated | |
1176 | * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag | |
1177 | * prevents that the debug code is called on kmem_cache_free() for the | |
1178 | * debug tracker objects to avoid recursive calls. | |
1179 | */ | |
1180 | void __init debug_objects_mem_init(void) | |
1181 | { | |
1182 | if (!debug_objects_enabled) | |
1183 | return; | |
1184 | ||
1185 | obj_cache = kmem_cache_create("debug_objects_cache", | |
1186 | sizeof (struct debug_obj), 0, | |
1187 | SLAB_DEBUG_OBJECTS, NULL); | |
1188 | ||
1be1cb7b | 1189 | if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a | 1190 | debug_objects_enabled = 0; |
3ff4f80a | 1191 | kmem_cache_destroy(obj_cache); |
719e4843 | 1192 | pr_warn("out of memory.\n"); |
1be1cb7b | 1193 | } else |
3ac7fe5a | 1194 | debug_objects_selftest(); |
97dd552e WL |
1195 | |
1196 | /* | |
1197 | * Increase the thresholds for allocating and freeing objects | |
1198 | * according to the number of possible CPUs available in the system. | |
1199 | */ | |
1200 | debug_objects_pool_size += num_possible_cpus() * 32; | |
1201 | debug_objects_pool_min_level += num_possible_cpus() * 4; | |
3ac7fe5a | 1202 | } |