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Commit | Line | Data |
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3ac7fe5a TG |
1 | /* |
2 | * Generic infrastructure for lifetime debugging of objects. | |
3 | * | |
4 | * Started by Thomas Gleixner | |
5 | * | |
6 | * Copyright (C) 2008, Thomas Gleixner <tglx@linutronix.de> | |
7 | * | |
8 | * For licencing details see kernel-base/COPYING | |
9 | */ | |
719e4843 FF |
10 | |
11 | #define pr_fmt(fmt) "ODEBUG: " fmt | |
12 | ||
3ac7fe5a TG |
13 | #include <linux/debugobjects.h> |
14 | #include <linux/interrupt.h> | |
d43c36dc | 15 | #include <linux/sched.h> |
68db0cf1 | 16 | #include <linux/sched/task_stack.h> |
3ac7fe5a TG |
17 | #include <linux/seq_file.h> |
18 | #include <linux/debugfs.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
3ac7fe5a | 20 | #include <linux/hash.h> |
caba4cbb | 21 | #include <linux/kmemleak.h> |
3ac7fe5a TG |
22 | |
23 | #define ODEBUG_HASH_BITS 14 | |
24 | #define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS) | |
25 | ||
0b6ec8c0 | 26 | #define ODEBUG_POOL_SIZE 1024 |
3ac7fe5a TG |
27 | #define ODEBUG_POOL_MIN_LEVEL 256 |
28 | ||
29 | #define ODEBUG_CHUNK_SHIFT PAGE_SHIFT | |
30 | #define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT) | |
31 | #define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1)) | |
32 | ||
33 | struct debug_bucket { | |
34 | struct hlist_head list; | |
aef9cb05 | 35 | raw_spinlock_t lock; |
3ac7fe5a TG |
36 | }; |
37 | ||
38 | static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE]; | |
39 | ||
1be1cb7b | 40 | static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE] __initdata; |
3ac7fe5a | 41 | |
aef9cb05 | 42 | static DEFINE_RAW_SPINLOCK(pool_lock); |
3ac7fe5a TG |
43 | |
44 | static HLIST_HEAD(obj_pool); | |
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 | |
204 | * debug objects will be delayed if the pool_lock is busy. We also free | |
205 | * the objects in a batch of 4 for each lock/unlock cycle. | |
3ac7fe5a | 206 | */ |
858274b6 WL |
207 | #define ODEBUG_FREE_BATCH 4 |
208 | ||
337fff8b | 209 | static void free_obj_work(struct work_struct *work) |
3ac7fe5a | 210 | { |
858274b6 | 211 | struct debug_obj *objs[ODEBUG_FREE_BATCH]; |
36c4ead6 YS |
212 | struct hlist_node *tmp; |
213 | struct debug_obj *obj; | |
673d62cc | 214 | unsigned long flags; |
858274b6 | 215 | int i; |
36c4ead6 | 216 | HLIST_HEAD(tofree); |
3ac7fe5a | 217 | |
858274b6 WL |
218 | if (!raw_spin_trylock_irqsave(&pool_lock, flags)) |
219 | return; | |
36c4ead6 YS |
220 | |
221 | /* | |
222 | * The objs on the pool list might be allocated before the work is | |
223 | * run, so recheck if pool list it full or not, if not fill pool | |
224 | * list from the global free list | |
225 | */ | |
226 | while (obj_nr_tofree && obj_pool_free < debug_objects_pool_size) { | |
227 | obj = hlist_entry(obj_to_free.first, typeof(*obj), node); | |
228 | hlist_del(&obj->node); | |
229 | hlist_add_head(&obj->node, &obj_pool); | |
230 | obj_pool_free++; | |
231 | obj_nr_tofree--; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Pool list is already full and there are still objs on the free | |
236 | * list. Move remaining free objs to a temporary list to free the | |
237 | * memory outside the pool_lock held region. | |
238 | */ | |
239 | if (obj_nr_tofree) { | |
240 | hlist_move_list(&obj_to_free, &tofree); | |
241 | obj_nr_tofree = 0; | |
242 | } | |
243 | ||
858274b6 WL |
244 | while (obj_pool_free >= debug_objects_pool_size + ODEBUG_FREE_BATCH) { |
245 | for (i = 0; i < ODEBUG_FREE_BATCH; i++) { | |
246 | objs[i] = hlist_entry(obj_pool.first, | |
247 | typeof(*objs[0]), node); | |
248 | hlist_del(&objs[i]->node); | |
249 | } | |
250 | ||
251 | obj_pool_free -= ODEBUG_FREE_BATCH; | |
252 | debug_objects_freed += ODEBUG_FREE_BATCH; | |
337fff8b TG |
253 | /* |
254 | * We release pool_lock across kmem_cache_free() to | |
255 | * avoid contention on pool_lock. | |
256 | */ | |
aef9cb05 | 257 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
858274b6 WL |
258 | for (i = 0; i < ODEBUG_FREE_BATCH; i++) |
259 | kmem_cache_free(obj_cache, objs[i]); | |
260 | if (!raw_spin_trylock_irqsave(&pool_lock, flags)) | |
261 | return; | |
3ac7fe5a | 262 | } |
aef9cb05 | 263 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
36c4ead6 YS |
264 | |
265 | hlist_for_each_entry_safe(obj, tmp, &tofree, node) { | |
266 | hlist_del(&obj->node); | |
267 | kmem_cache_free(obj_cache, obj); | |
268 | } | |
337fff8b TG |
269 | } |
270 | ||
271 | /* | |
272 | * Put the object back into the pool and schedule work to free objects | |
273 | * if necessary. | |
274 | */ | |
275 | static void free_object(struct debug_obj *obj) | |
276 | { | |
277 | unsigned long flags; | |
278 | int sched = 0; | |
279 | ||
aef9cb05 | 280 | raw_spin_lock_irqsave(&pool_lock, flags); |
337fff8b TG |
281 | /* |
282 | * schedule work when the pool is filled and the cache is | |
283 | * initialized: | |
284 | */ | |
97dd552e | 285 | if (obj_pool_free > debug_objects_pool_size && obj_cache) |
7092dff2 | 286 | sched = 1; |
337fff8b TG |
287 | hlist_add_head(&obj->node, &obj_pool); |
288 | obj_pool_free++; | |
289 | obj_pool_used--; | |
aef9cb05 | 290 | raw_spin_unlock_irqrestore(&pool_lock, flags); |
337fff8b TG |
291 | if (sched) |
292 | schedule_work(&debug_obj_work); | |
3ac7fe5a TG |
293 | } |
294 | ||
295 | /* | |
296 | * We run out of memory. That means we probably have tons of objects | |
297 | * allocated. | |
298 | */ | |
299 | static void debug_objects_oom(void) | |
300 | { | |
301 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 302 | struct hlist_node *tmp; |
673d62cc | 303 | HLIST_HEAD(freelist); |
3ac7fe5a TG |
304 | struct debug_obj *obj; |
305 | unsigned long flags; | |
306 | int i; | |
307 | ||
719e4843 | 308 | pr_warn("Out of memory. ODEBUG disabled\n"); |
3ac7fe5a TG |
309 | |
310 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
aef9cb05 | 311 | raw_spin_lock_irqsave(&db->lock, flags); |
673d62cc | 312 | hlist_move_list(&db->list, &freelist); |
aef9cb05 | 313 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc VN |
314 | |
315 | /* Now free them */ | |
b67bfe0d | 316 | hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
3ac7fe5a TG |
317 | hlist_del(&obj->node); |
318 | free_object(obj); | |
319 | } | |
3ac7fe5a TG |
320 | } |
321 | } | |
322 | ||
323 | /* | |
324 | * We use the pfn of the address for the hash. That way we can check | |
325 | * for freed objects simply by checking the affected bucket. | |
326 | */ | |
327 | static struct debug_bucket *get_bucket(unsigned long addr) | |
328 | { | |
329 | unsigned long hash; | |
330 | ||
331 | hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS); | |
332 | return &obj_hash[hash]; | |
333 | } | |
334 | ||
335 | static void debug_print_object(struct debug_obj *obj, char *msg) | |
336 | { | |
99777288 | 337 | struct debug_obj_descr *descr = obj->descr; |
3ac7fe5a TG |
338 | static int limit; |
339 | ||
99777288 SG |
340 | if (limit < 5 && descr != descr_test) { |
341 | void *hint = descr->debug_hint ? | |
342 | descr->debug_hint(obj->object) : NULL; | |
3ac7fe5a | 343 | limit++; |
a5d8e467 | 344 | WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " |
99777288 | 345 | "object type: %s hint: %pS\n", |
a5d8e467 | 346 | msg, obj_states[obj->state], obj->astate, |
99777288 | 347 | descr->name, hint); |
3ac7fe5a TG |
348 | } |
349 | debug_objects_warnings++; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Try to repair the damage, so we have a better chance to get useful | |
354 | * debug output. | |
355 | */ | |
b1e4d9d8 CD |
356 | static bool |
357 | debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state), | |
3ac7fe5a TG |
358 | void * addr, enum debug_obj_state state) |
359 | { | |
b1e4d9d8 CD |
360 | if (fixup && fixup(addr, state)) { |
361 | debug_objects_fixups++; | |
362 | return true; | |
363 | } | |
364 | return false; | |
3ac7fe5a TG |
365 | } |
366 | ||
367 | static void debug_object_is_on_stack(void *addr, int onstack) | |
368 | { | |
3ac7fe5a TG |
369 | int is_on_stack; |
370 | static int limit; | |
371 | ||
372 | if (limit > 4) | |
373 | return; | |
374 | ||
8b05c7e6 | 375 | is_on_stack = object_is_on_stack(addr); |
3ac7fe5a TG |
376 | if (is_on_stack == onstack) |
377 | return; | |
378 | ||
379 | limit++; | |
380 | if (is_on_stack) | |
719e4843 | 381 | pr_warn("object is on stack, but not annotated\n"); |
3ac7fe5a | 382 | else |
719e4843 | 383 | pr_warn("object is not on stack, but annotated\n"); |
3ac7fe5a TG |
384 | WARN_ON(1); |
385 | } | |
386 | ||
387 | static void | |
388 | __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) | |
389 | { | |
390 | enum debug_obj_state state; | |
391 | struct debug_bucket *db; | |
392 | struct debug_obj *obj; | |
393 | unsigned long flags; | |
394 | ||
50db04dd VN |
395 | fill_pool(); |
396 | ||
3ac7fe5a TG |
397 | db = get_bucket((unsigned long) addr); |
398 | ||
aef9cb05 | 399 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
400 | |
401 | obj = lookup_object(addr, db); | |
402 | if (!obj) { | |
403 | obj = alloc_object(addr, db, descr); | |
404 | if (!obj) { | |
405 | debug_objects_enabled = 0; | |
aef9cb05 | 406 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
407 | debug_objects_oom(); |
408 | return; | |
409 | } | |
410 | debug_object_is_on_stack(addr, onstack); | |
411 | } | |
412 | ||
413 | switch (obj->state) { | |
414 | case ODEBUG_STATE_NONE: | |
415 | case ODEBUG_STATE_INIT: | |
416 | case ODEBUG_STATE_INACTIVE: | |
417 | obj->state = ODEBUG_STATE_INIT; | |
418 | break; | |
419 | ||
420 | case ODEBUG_STATE_ACTIVE: | |
421 | debug_print_object(obj, "init"); | |
422 | state = obj->state; | |
aef9cb05 | 423 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
424 | debug_object_fixup(descr->fixup_init, addr, state); |
425 | return; | |
426 | ||
427 | case ODEBUG_STATE_DESTROYED: | |
428 | debug_print_object(obj, "init"); | |
429 | break; | |
430 | default: | |
431 | break; | |
432 | } | |
433 | ||
aef9cb05 | 434 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
435 | } |
436 | ||
437 | /** | |
438 | * debug_object_init - debug checks when an object is initialized | |
439 | * @addr: address of the object | |
440 | * @descr: pointer to an object specific debug description structure | |
441 | */ | |
442 | void debug_object_init(void *addr, struct debug_obj_descr *descr) | |
443 | { | |
444 | if (!debug_objects_enabled) | |
445 | return; | |
446 | ||
447 | __debug_object_init(addr, descr, 0); | |
448 | } | |
f8ff04e2 | 449 | EXPORT_SYMBOL_GPL(debug_object_init); |
3ac7fe5a TG |
450 | |
451 | /** | |
452 | * debug_object_init_on_stack - debug checks when an object on stack is | |
453 | * initialized | |
454 | * @addr: address of the object | |
455 | * @descr: pointer to an object specific debug description structure | |
456 | */ | |
457 | void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) | |
458 | { | |
459 | if (!debug_objects_enabled) | |
460 | return; | |
461 | ||
462 | __debug_object_init(addr, descr, 1); | |
463 | } | |
f8ff04e2 | 464 | EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
3ac7fe5a TG |
465 | |
466 | /** | |
467 | * debug_object_activate - debug checks when an object is activated | |
468 | * @addr: address of the object | |
469 | * @descr: pointer to an object specific debug description structure | |
b778ae25 | 470 | * Returns 0 for success, -EINVAL for check failed. |
3ac7fe5a | 471 | */ |
b778ae25 | 472 | int debug_object_activate(void *addr, struct debug_obj_descr *descr) |
3ac7fe5a TG |
473 | { |
474 | enum debug_obj_state state; | |
475 | struct debug_bucket *db; | |
476 | struct debug_obj *obj; | |
477 | unsigned long flags; | |
b778ae25 | 478 | int ret; |
feac18dd SB |
479 | struct debug_obj o = { .object = addr, |
480 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
481 | .descr = descr }; | |
3ac7fe5a TG |
482 | |
483 | if (!debug_objects_enabled) | |
b778ae25 | 484 | return 0; |
3ac7fe5a TG |
485 | |
486 | db = get_bucket((unsigned long) addr); | |
487 | ||
aef9cb05 | 488 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
489 | |
490 | obj = lookup_object(addr, db); | |
491 | if (obj) { | |
492 | switch (obj->state) { | |
493 | case ODEBUG_STATE_INIT: | |
494 | case ODEBUG_STATE_INACTIVE: | |
495 | obj->state = ODEBUG_STATE_ACTIVE; | |
b778ae25 | 496 | ret = 0; |
3ac7fe5a TG |
497 | break; |
498 | ||
499 | case ODEBUG_STATE_ACTIVE: | |
500 | debug_print_object(obj, "activate"); | |
501 | state = obj->state; | |
aef9cb05 | 502 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 503 | ret = debug_object_fixup(descr->fixup_activate, addr, state); |
e7a8e78b | 504 | return ret ? 0 : -EINVAL; |
3ac7fe5a TG |
505 | |
506 | case ODEBUG_STATE_DESTROYED: | |
507 | debug_print_object(obj, "activate"); | |
b778ae25 | 508 | ret = -EINVAL; |
3ac7fe5a TG |
509 | break; |
510 | default: | |
b778ae25 | 511 | ret = 0; |
3ac7fe5a TG |
512 | break; |
513 | } | |
aef9cb05 | 514 | raw_spin_unlock_irqrestore(&db->lock, flags); |
b778ae25 | 515 | return ret; |
3ac7fe5a TG |
516 | } |
517 | ||
aef9cb05 | 518 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 519 | /* |
b9fdac7f CD |
520 | * We are here when a static object is activated. We |
521 | * let the type specific code confirm whether this is | |
522 | * true or not. if true, we just make sure that the | |
523 | * static object is tracked in the object tracker. If | |
524 | * not, this must be a bug, so we try to fix it up. | |
3ac7fe5a | 525 | */ |
b9fdac7f CD |
526 | if (descr->is_static_object && descr->is_static_object(addr)) { |
527 | /* track this static object */ | |
528 | debug_object_init(addr, descr); | |
529 | debug_object_activate(addr, descr); | |
530 | } else { | |
feac18dd | 531 | debug_print_object(&o, "activate"); |
b9fdac7f CD |
532 | ret = debug_object_fixup(descr->fixup_activate, addr, |
533 | ODEBUG_STATE_NOTAVAILABLE); | |
534 | return ret ? 0 : -EINVAL; | |
b778ae25 PM |
535 | } |
536 | return 0; | |
3ac7fe5a | 537 | } |
f8ff04e2 | 538 | EXPORT_SYMBOL_GPL(debug_object_activate); |
3ac7fe5a TG |
539 | |
540 | /** | |
541 | * debug_object_deactivate - debug checks when an object is deactivated | |
542 | * @addr: address of the object | |
543 | * @descr: pointer to an object specific debug description structure | |
544 | */ | |
545 | void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) | |
546 | { | |
547 | struct debug_bucket *db; | |
548 | struct debug_obj *obj; | |
549 | unsigned long flags; | |
550 | ||
551 | if (!debug_objects_enabled) | |
552 | return; | |
553 | ||
554 | db = get_bucket((unsigned long) addr); | |
555 | ||
aef9cb05 | 556 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
557 | |
558 | obj = lookup_object(addr, db); | |
559 | if (obj) { | |
560 | switch (obj->state) { | |
561 | case ODEBUG_STATE_INIT: | |
562 | case ODEBUG_STATE_INACTIVE: | |
563 | case ODEBUG_STATE_ACTIVE: | |
a5d8e467 MD |
564 | if (!obj->astate) |
565 | obj->state = ODEBUG_STATE_INACTIVE; | |
566 | else | |
567 | debug_print_object(obj, "deactivate"); | |
3ac7fe5a TG |
568 | break; |
569 | ||
570 | case ODEBUG_STATE_DESTROYED: | |
571 | debug_print_object(obj, "deactivate"); | |
572 | break; | |
573 | default: | |
574 | break; | |
575 | } | |
576 | } else { | |
577 | struct debug_obj o = { .object = addr, | |
578 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
579 | .descr = descr }; | |
580 | ||
581 | debug_print_object(&o, "deactivate"); | |
582 | } | |
583 | ||
aef9cb05 | 584 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 585 | } |
f8ff04e2 | 586 | EXPORT_SYMBOL_GPL(debug_object_deactivate); |
3ac7fe5a TG |
587 | |
588 | /** | |
589 | * debug_object_destroy - debug checks when an object is destroyed | |
590 | * @addr: address of the object | |
591 | * @descr: pointer to an object specific debug description structure | |
592 | */ | |
593 | void debug_object_destroy(void *addr, struct debug_obj_descr *descr) | |
594 | { | |
595 | enum debug_obj_state state; | |
596 | struct debug_bucket *db; | |
597 | struct debug_obj *obj; | |
598 | unsigned long flags; | |
599 | ||
600 | if (!debug_objects_enabled) | |
601 | return; | |
602 | ||
603 | db = get_bucket((unsigned long) addr); | |
604 | ||
aef9cb05 | 605 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
606 | |
607 | obj = lookup_object(addr, db); | |
608 | if (!obj) | |
609 | goto out_unlock; | |
610 | ||
611 | switch (obj->state) { | |
612 | case ODEBUG_STATE_NONE: | |
613 | case ODEBUG_STATE_INIT: | |
614 | case ODEBUG_STATE_INACTIVE: | |
615 | obj->state = ODEBUG_STATE_DESTROYED; | |
616 | break; | |
617 | case ODEBUG_STATE_ACTIVE: | |
618 | debug_print_object(obj, "destroy"); | |
619 | state = obj->state; | |
aef9cb05 | 620 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
621 | debug_object_fixup(descr->fixup_destroy, addr, state); |
622 | return; | |
623 | ||
624 | case ODEBUG_STATE_DESTROYED: | |
625 | debug_print_object(obj, "destroy"); | |
626 | break; | |
627 | default: | |
628 | break; | |
629 | } | |
630 | out_unlock: | |
aef9cb05 | 631 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 632 | } |
f8ff04e2 | 633 | EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a TG |
634 | |
635 | /** | |
636 | * debug_object_free - debug checks when an object is freed | |
637 | * @addr: address of the object | |
638 | * @descr: pointer to an object specific debug description structure | |
639 | */ | |
640 | void debug_object_free(void *addr, struct debug_obj_descr *descr) | |
641 | { | |
642 | enum debug_obj_state state; | |
643 | struct debug_bucket *db; | |
644 | struct debug_obj *obj; | |
645 | unsigned long flags; | |
646 | ||
647 | if (!debug_objects_enabled) | |
648 | return; | |
649 | ||
650 | db = get_bucket((unsigned long) addr); | |
651 | ||
aef9cb05 | 652 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
653 | |
654 | obj = lookup_object(addr, db); | |
655 | if (!obj) | |
656 | goto out_unlock; | |
657 | ||
658 | switch (obj->state) { | |
659 | case ODEBUG_STATE_ACTIVE: | |
660 | debug_print_object(obj, "free"); | |
661 | state = obj->state; | |
aef9cb05 | 662 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
663 | debug_object_fixup(descr->fixup_free, addr, state); |
664 | return; | |
665 | default: | |
666 | hlist_del(&obj->node); | |
aef9cb05 | 667 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 668 | free_object(obj); |
673d62cc | 669 | return; |
3ac7fe5a TG |
670 | } |
671 | out_unlock: | |
aef9cb05 | 672 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a | 673 | } |
f8ff04e2 | 674 | EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a | 675 | |
b84d435c CC |
676 | /** |
677 | * debug_object_assert_init - debug checks when object should be init-ed | |
678 | * @addr: address of the object | |
679 | * @descr: pointer to an object specific debug description structure | |
680 | */ | |
681 | void debug_object_assert_init(void *addr, struct debug_obj_descr *descr) | |
682 | { | |
683 | struct debug_bucket *db; | |
684 | struct debug_obj *obj; | |
685 | unsigned long flags; | |
686 | ||
687 | if (!debug_objects_enabled) | |
688 | return; | |
689 | ||
690 | db = get_bucket((unsigned long) addr); | |
691 | ||
692 | raw_spin_lock_irqsave(&db->lock, flags); | |
693 | ||
694 | obj = lookup_object(addr, db); | |
695 | if (!obj) { | |
696 | struct debug_obj o = { .object = addr, | |
697 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
698 | .descr = descr }; | |
699 | ||
700 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
701 | /* | |
b9fdac7f CD |
702 | * Maybe the object is static, and we let the type specific |
703 | * code confirm. Track this static object if true, else invoke | |
704 | * fixup. | |
b84d435c | 705 | */ |
b9fdac7f CD |
706 | if (descr->is_static_object && descr->is_static_object(addr)) { |
707 | /* Track this static object */ | |
708 | debug_object_init(addr, descr); | |
709 | } else { | |
b84d435c | 710 | debug_print_object(&o, "assert_init"); |
b9fdac7f CD |
711 | debug_object_fixup(descr->fixup_assert_init, addr, |
712 | ODEBUG_STATE_NOTAVAILABLE); | |
713 | } | |
b84d435c CC |
714 | return; |
715 | } | |
716 | ||
717 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
718 | } | |
f8ff04e2 | 719 | EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435c | 720 | |
a5d8e467 MD |
721 | /** |
722 | * debug_object_active_state - debug checks object usage state machine | |
723 | * @addr: address of the object | |
724 | * @descr: pointer to an object specific debug description structure | |
725 | * @expect: expected state | |
726 | * @next: state to move to if expected state is found | |
727 | */ | |
728 | void | |
729 | debug_object_active_state(void *addr, struct debug_obj_descr *descr, | |
730 | unsigned int expect, unsigned int next) | |
731 | { | |
732 | struct debug_bucket *db; | |
733 | struct debug_obj *obj; | |
734 | unsigned long flags; | |
735 | ||
736 | if (!debug_objects_enabled) | |
737 | return; | |
738 | ||
739 | db = get_bucket((unsigned long) addr); | |
740 | ||
741 | raw_spin_lock_irqsave(&db->lock, flags); | |
742 | ||
743 | obj = lookup_object(addr, db); | |
744 | if (obj) { | |
745 | switch (obj->state) { | |
746 | case ODEBUG_STATE_ACTIVE: | |
747 | if (obj->astate == expect) | |
748 | obj->astate = next; | |
749 | else | |
750 | debug_print_object(obj, "active_state"); | |
751 | break; | |
752 | ||
753 | default: | |
754 | debug_print_object(obj, "active_state"); | |
755 | break; | |
756 | } | |
757 | } else { | |
758 | struct debug_obj o = { .object = addr, | |
759 | .state = ODEBUG_STATE_NOTAVAILABLE, | |
760 | .descr = descr }; | |
761 | ||
762 | debug_print_object(&o, "active_state"); | |
763 | } | |
764 | ||
765 | raw_spin_unlock_irqrestore(&db->lock, flags); | |
766 | } | |
f8ff04e2 | 767 | EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467 | 768 | |
3ac7fe5a TG |
769 | #ifdef CONFIG_DEBUG_OBJECTS_FREE |
770 | static void __debug_check_no_obj_freed(const void *address, unsigned long size) | |
771 | { | |
772 | unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; | |
b67bfe0d | 773 | struct hlist_node *tmp; |
673d62cc | 774 | HLIST_HEAD(freelist); |
3ac7fe5a TG |
775 | struct debug_obj_descr *descr; |
776 | enum debug_obj_state state; | |
777 | struct debug_bucket *db; | |
778 | struct debug_obj *obj; | |
bd9dcd04 | 779 | int cnt, objs_checked = 0; |
3ac7fe5a TG |
780 | |
781 | saddr = (unsigned long) address; | |
782 | eaddr = saddr + size; | |
783 | paddr = saddr & ODEBUG_CHUNK_MASK; | |
784 | chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); | |
785 | chunks >>= ODEBUG_CHUNK_SHIFT; | |
786 | ||
787 | for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { | |
788 | db = get_bucket(paddr); | |
789 | ||
790 | repeat: | |
791 | cnt = 0; | |
aef9cb05 | 792 | raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d | 793 | hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a TG |
794 | cnt++; |
795 | oaddr = (unsigned long) obj->object; | |
796 | if (oaddr < saddr || oaddr >= eaddr) | |
797 | continue; | |
798 | ||
799 | switch (obj->state) { | |
800 | case ODEBUG_STATE_ACTIVE: | |
801 | debug_print_object(obj, "free"); | |
802 | descr = obj->descr; | |
803 | state = obj->state; | |
aef9cb05 | 804 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
805 | debug_object_fixup(descr->fixup_free, |
806 | (void *) oaddr, state); | |
807 | goto repeat; | |
808 | default: | |
809 | hlist_del(&obj->node); | |
673d62cc | 810 | hlist_add_head(&obj->node, &freelist); |
3ac7fe5a TG |
811 | break; |
812 | } | |
813 | } | |
aef9cb05 | 814 | raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc VN |
815 | |
816 | /* Now free them */ | |
b67bfe0d | 817 | hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
673d62cc VN |
818 | hlist_del(&obj->node); |
819 | free_object(obj); | |
820 | } | |
821 | ||
3ac7fe5a TG |
822 | if (cnt > debug_objects_maxchain) |
823 | debug_objects_maxchain = cnt; | |
bd9dcd04 YS |
824 | |
825 | objs_checked += cnt; | |
3ac7fe5a | 826 | } |
bd9dcd04 YS |
827 | |
828 | if (objs_checked > debug_objects_maxchecked) | |
829 | debug_objects_maxchecked = objs_checked; | |
3ac7fe5a TG |
830 | } |
831 | ||
832 | void debug_check_no_obj_freed(const void *address, unsigned long size) | |
833 | { | |
834 | if (debug_objects_enabled) | |
835 | __debug_check_no_obj_freed(address, size); | |
836 | } | |
837 | #endif | |
838 | ||
839 | #ifdef CONFIG_DEBUG_FS | |
840 | ||
841 | static int debug_stats_show(struct seq_file *m, void *v) | |
842 | { | |
843 | seq_printf(m, "max_chain :%d\n", debug_objects_maxchain); | |
bd9dcd04 | 844 | seq_printf(m, "max_checked :%d\n", debug_objects_maxchecked); |
3ac7fe5a TG |
845 | seq_printf(m, "warnings :%d\n", debug_objects_warnings); |
846 | seq_printf(m, "fixups :%d\n", debug_objects_fixups); | |
847 | seq_printf(m, "pool_free :%d\n", obj_pool_free); | |
848 | seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free); | |
849 | seq_printf(m, "pool_used :%d\n", obj_pool_used); | |
850 | seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used); | |
36c4ead6 | 851 | seq_printf(m, "on_free_list :%d\n", obj_nr_tofree); |
0cad93c3 WL |
852 | seq_printf(m, "objs_allocated:%d\n", debug_objects_allocated); |
853 | seq_printf(m, "objs_freed :%d\n", debug_objects_freed); | |
3ac7fe5a TG |
854 | return 0; |
855 | } | |
856 | ||
857 | static int debug_stats_open(struct inode *inode, struct file *filp) | |
858 | { | |
859 | return single_open(filp, debug_stats_show, NULL); | |
860 | } | |
861 | ||
862 | static const struct file_operations debug_stats_fops = { | |
863 | .open = debug_stats_open, | |
864 | .read = seq_read, | |
865 | .llseek = seq_lseek, | |
866 | .release = single_release, | |
867 | }; | |
868 | ||
869 | static int __init debug_objects_init_debugfs(void) | |
870 | { | |
871 | struct dentry *dbgdir, *dbgstats; | |
872 | ||
873 | if (!debug_objects_enabled) | |
874 | return 0; | |
875 | ||
876 | dbgdir = debugfs_create_dir("debug_objects", NULL); | |
877 | if (!dbgdir) | |
878 | return -ENOMEM; | |
879 | ||
880 | dbgstats = debugfs_create_file("stats", 0444, dbgdir, NULL, | |
881 | &debug_stats_fops); | |
882 | if (!dbgstats) | |
883 | goto err; | |
884 | ||
885 | return 0; | |
886 | ||
887 | err: | |
888 | debugfs_remove(dbgdir); | |
889 | ||
890 | return -ENOMEM; | |
891 | } | |
892 | __initcall(debug_objects_init_debugfs); | |
893 | ||
894 | #else | |
895 | static inline void debug_objects_init_debugfs(void) { } | |
896 | #endif | |
897 | ||
898 | #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST | |
899 | ||
900 | /* Random data structure for the self test */ | |
901 | struct self_test { | |
902 | unsigned long dummy1[6]; | |
903 | int static_init; | |
904 | unsigned long dummy2[3]; | |
905 | }; | |
906 | ||
907 | static __initdata struct debug_obj_descr descr_type_test; | |
908 | ||
b9fdac7f CD |
909 | static bool __init is_static_object(void *addr) |
910 | { | |
911 | struct self_test *obj = addr; | |
912 | ||
913 | return obj->static_init; | |
914 | } | |
915 | ||
3ac7fe5a TG |
916 | /* |
917 | * fixup_init is called when: | |
918 | * - an active object is initialized | |
919 | */ | |
b1e4d9d8 | 920 | static bool __init fixup_init(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
921 | { |
922 | struct self_test *obj = addr; | |
923 | ||
924 | switch (state) { | |
925 | case ODEBUG_STATE_ACTIVE: | |
926 | debug_object_deactivate(obj, &descr_type_test); | |
927 | debug_object_init(obj, &descr_type_test); | |
b1e4d9d8 | 928 | return true; |
3ac7fe5a | 929 | default: |
b1e4d9d8 | 930 | return false; |
3ac7fe5a TG |
931 | } |
932 | } | |
933 | ||
934 | /* | |
935 | * fixup_activate is called when: | |
936 | * - an active object is activated | |
b9fdac7f | 937 | * - an unknown non-static object is activated |
3ac7fe5a | 938 | */ |
b1e4d9d8 | 939 | static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
940 | { |
941 | struct self_test *obj = addr; | |
942 | ||
943 | switch (state) { | |
944 | case ODEBUG_STATE_NOTAVAILABLE: | |
b1e4d9d8 | 945 | return true; |
3ac7fe5a TG |
946 | case ODEBUG_STATE_ACTIVE: |
947 | debug_object_deactivate(obj, &descr_type_test); | |
948 | debug_object_activate(obj, &descr_type_test); | |
b1e4d9d8 | 949 | return true; |
3ac7fe5a TG |
950 | |
951 | default: | |
b1e4d9d8 | 952 | return false; |
3ac7fe5a TG |
953 | } |
954 | } | |
955 | ||
956 | /* | |
957 | * fixup_destroy is called when: | |
958 | * - an active object is destroyed | |
959 | */ | |
b1e4d9d8 | 960 | static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
961 | { |
962 | struct self_test *obj = addr; | |
963 | ||
964 | switch (state) { | |
965 | case ODEBUG_STATE_ACTIVE: | |
966 | debug_object_deactivate(obj, &descr_type_test); | |
967 | debug_object_destroy(obj, &descr_type_test); | |
b1e4d9d8 | 968 | return true; |
3ac7fe5a | 969 | default: |
b1e4d9d8 | 970 | return false; |
3ac7fe5a TG |
971 | } |
972 | } | |
973 | ||
974 | /* | |
975 | * fixup_free is called when: | |
976 | * - an active object is freed | |
977 | */ | |
b1e4d9d8 | 978 | static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a TG |
979 | { |
980 | struct self_test *obj = addr; | |
981 | ||
982 | switch (state) { | |
983 | case ODEBUG_STATE_ACTIVE: | |
984 | debug_object_deactivate(obj, &descr_type_test); | |
985 | debug_object_free(obj, &descr_type_test); | |
b1e4d9d8 | 986 | return true; |
3ac7fe5a | 987 | default: |
b1e4d9d8 | 988 | return false; |
3ac7fe5a TG |
989 | } |
990 | } | |
991 | ||
1fb2f77c | 992 | static int __init |
3ac7fe5a TG |
993 | check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) |
994 | { | |
995 | struct debug_bucket *db; | |
996 | struct debug_obj *obj; | |
997 | unsigned long flags; | |
998 | int res = -EINVAL; | |
999 | ||
1000 | db = get_bucket((unsigned long) addr); | |
1001 | ||
aef9cb05 | 1002 | raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a TG |
1003 | |
1004 | obj = lookup_object(addr, db); | |
1005 | if (!obj && state != ODEBUG_STATE_NONE) { | |
5cd2b459 | 1006 | WARN(1, KERN_ERR "ODEBUG: selftest object not found\n"); |
3ac7fe5a TG |
1007 | goto out; |
1008 | } | |
1009 | if (obj && obj->state != state) { | |
5cd2b459 | 1010 | WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n", |
3ac7fe5a | 1011 | obj->state, state); |
3ac7fe5a TG |
1012 | goto out; |
1013 | } | |
1014 | if (fixups != debug_objects_fixups) { | |
5cd2b459 | 1015 | WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n", |
3ac7fe5a | 1016 | fixups, debug_objects_fixups); |
3ac7fe5a TG |
1017 | goto out; |
1018 | } | |
1019 | if (warnings != debug_objects_warnings) { | |
5cd2b459 | 1020 | WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n", |
3ac7fe5a | 1021 | warnings, debug_objects_warnings); |
3ac7fe5a TG |
1022 | goto out; |
1023 | } | |
1024 | res = 0; | |
1025 | out: | |
aef9cb05 | 1026 | raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a TG |
1027 | if (res) |
1028 | debug_objects_enabled = 0; | |
1029 | return res; | |
1030 | } | |
1031 | ||
1032 | static __initdata struct debug_obj_descr descr_type_test = { | |
1033 | .name = "selftest", | |
b9fdac7f | 1034 | .is_static_object = is_static_object, |
3ac7fe5a TG |
1035 | .fixup_init = fixup_init, |
1036 | .fixup_activate = fixup_activate, | |
1037 | .fixup_destroy = fixup_destroy, | |
1038 | .fixup_free = fixup_free, | |
1039 | }; | |
1040 | ||
1041 | static __initdata struct self_test obj = { .static_init = 0 }; | |
1042 | ||
1043 | static void __init debug_objects_selftest(void) | |
1044 | { | |
1045 | int fixups, oldfixups, warnings, oldwarnings; | |
1046 | unsigned long flags; | |
1047 | ||
1048 | local_irq_save(flags); | |
1049 | ||
1050 | fixups = oldfixups = debug_objects_fixups; | |
1051 | warnings = oldwarnings = debug_objects_warnings; | |
1052 | descr_test = &descr_type_test; | |
1053 | ||
1054 | debug_object_init(&obj, &descr_type_test); | |
1055 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
1056 | goto out; | |
1057 | debug_object_activate(&obj, &descr_type_test); | |
1058 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
1059 | goto out; | |
1060 | debug_object_activate(&obj, &descr_type_test); | |
1061 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) | |
1062 | goto out; | |
1063 | debug_object_deactivate(&obj, &descr_type_test); | |
1064 | if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) | |
1065 | goto out; | |
1066 | debug_object_destroy(&obj, &descr_type_test); | |
1067 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) | |
1068 | goto out; | |
1069 | debug_object_init(&obj, &descr_type_test); | |
1070 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1071 | goto out; | |
1072 | debug_object_activate(&obj, &descr_type_test); | |
1073 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1074 | goto out; | |
1075 | debug_object_deactivate(&obj, &descr_type_test); | |
1076 | if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) | |
1077 | goto out; | |
1078 | debug_object_free(&obj, &descr_type_test); | |
1079 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1080 | goto out; | |
1081 | ||
1082 | obj.static_init = 1; | |
1083 | debug_object_activate(&obj, &descr_type_test); | |
9f78ff00 | 1084 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a TG |
1085 | goto out; |
1086 | debug_object_init(&obj, &descr_type_test); | |
1087 | if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) | |
1088 | goto out; | |
1089 | debug_object_free(&obj, &descr_type_test); | |
1090 | if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) | |
1091 | goto out; | |
1092 | ||
1093 | #ifdef CONFIG_DEBUG_OBJECTS_FREE | |
1094 | debug_object_init(&obj, &descr_type_test); | |
1095 | if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) | |
1096 | goto out; | |
1097 | debug_object_activate(&obj, &descr_type_test); | |
1098 | if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) | |
1099 | goto out; | |
1100 | __debug_check_no_obj_freed(&obj, sizeof(obj)); | |
1101 | if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) | |
1102 | goto out; | |
1103 | #endif | |
719e4843 | 1104 | pr_info("selftest passed\n"); |
3ac7fe5a TG |
1105 | |
1106 | out: | |
1107 | debug_objects_fixups = oldfixups; | |
1108 | debug_objects_warnings = oldwarnings; | |
1109 | descr_test = NULL; | |
1110 | ||
1111 | local_irq_restore(flags); | |
1112 | } | |
1113 | #else | |
1114 | static inline void debug_objects_selftest(void) { } | |
1115 | #endif | |
1116 | ||
1117 | /* | |
1118 | * Called during early boot to initialize the hash buckets and link | |
1119 | * the static object pool objects into the poll list. After this call | |
1120 | * the object tracker is fully operational. | |
1121 | */ | |
1122 | void __init debug_objects_early_init(void) | |
1123 | { | |
1124 | int i; | |
1125 | ||
1126 | for (i = 0; i < ODEBUG_HASH_SIZE; i++) | |
aef9cb05 | 1127 | raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a TG |
1128 | |
1129 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) | |
1130 | hlist_add_head(&obj_static_pool[i].node, &obj_pool); | |
1131 | } | |
1132 | ||
1be1cb7b TG |
1133 | /* |
1134 | * Convert the statically allocated objects to dynamic ones: | |
1135 | */ | |
1fb2f77c | 1136 | static int __init debug_objects_replace_static_objects(void) |
1be1cb7b TG |
1137 | { |
1138 | struct debug_bucket *db = obj_hash; | |
b67bfe0d | 1139 | struct hlist_node *tmp; |
1be1cb7b TG |
1140 | struct debug_obj *obj, *new; |
1141 | HLIST_HEAD(objects); | |
1142 | int i, cnt = 0; | |
1143 | ||
1144 | for (i = 0; i < ODEBUG_POOL_SIZE; i++) { | |
1145 | obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); | |
1146 | if (!obj) | |
1147 | goto free; | |
caba4cbb | 1148 | kmemleak_ignore(obj); |
1be1cb7b TG |
1149 | hlist_add_head(&obj->node, &objects); |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * When debug_objects_mem_init() is called we know that only | |
1154 | * one CPU is up, so disabling interrupts is enough | |
1155 | * protection. This avoids the lockdep hell of lock ordering. | |
1156 | */ | |
1157 | local_irq_disable(); | |
1158 | ||
1159 | /* Remove the statically allocated objects from the pool */ | |
b67bfe0d | 1160 | hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b TG |
1161 | hlist_del(&obj->node); |
1162 | /* Move the allocated objects to the pool */ | |
1163 | hlist_move_list(&objects, &obj_pool); | |
1164 | ||
1165 | /* Replace the active object references */ | |
1166 | for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { | |
1167 | hlist_move_list(&db->list, &objects); | |
1168 | ||
b67bfe0d | 1169 | hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b TG |
1170 | new = hlist_entry(obj_pool.first, typeof(*obj), node); |
1171 | hlist_del(&new->node); | |
1172 | /* copy object data */ | |
1173 | *new = *obj; | |
1174 | hlist_add_head(&new->node, &db->list); | |
1175 | cnt++; | |
1176 | } | |
1177 | } | |
765a5e0c | 1178 | local_irq_enable(); |
1be1cb7b | 1179 | |
c0f35cc0 FF |
1180 | pr_debug("%d of %d active objects replaced\n", |
1181 | cnt, obj_pool_used); | |
1be1cb7b TG |
1182 | return 0; |
1183 | free: | |
b67bfe0d | 1184 | hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b TG |
1185 | hlist_del(&obj->node); |
1186 | kmem_cache_free(obj_cache, obj); | |
1187 | } | |
1188 | return -ENOMEM; | |
1189 | } | |
1190 | ||
3ac7fe5a TG |
1191 | /* |
1192 | * Called after the kmem_caches are functional to setup a dedicated | |
1193 | * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag | |
1194 | * prevents that the debug code is called on kmem_cache_free() for the | |
1195 | * debug tracker objects to avoid recursive calls. | |
1196 | */ | |
1197 | void __init debug_objects_mem_init(void) | |
1198 | { | |
1199 | if (!debug_objects_enabled) | |
1200 | return; | |
1201 | ||
1202 | obj_cache = kmem_cache_create("debug_objects_cache", | |
1203 | sizeof (struct debug_obj), 0, | |
1204 | SLAB_DEBUG_OBJECTS, NULL); | |
1205 | ||
1be1cb7b | 1206 | if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a | 1207 | debug_objects_enabled = 0; |
1be1cb7b TG |
1208 | if (obj_cache) |
1209 | kmem_cache_destroy(obj_cache); | |
719e4843 | 1210 | pr_warn("out of memory.\n"); |
1be1cb7b | 1211 | } else |
3ac7fe5a | 1212 | debug_objects_selftest(); |
97dd552e WL |
1213 | |
1214 | /* | |
1215 | * Increase the thresholds for allocating and freeing objects | |
1216 | * according to the number of possible CPUs available in the system. | |
1217 | */ | |
1218 | debug_objects_pool_size += num_possible_cpus() * 32; | |
1219 | debug_objects_pool_min_level += num_possible_cpus() * 4; | |
3ac7fe5a | 1220 | } |