1 #ifndef _LINUX_DEBUGOBJECTS_H
2 #define _LINUX_DEBUGOBJECTS_H
3
4 #include <linux/list.h>
5 #include <linux/spinlock.h>
6
7 enum debug_obj_state {
8 ODEBUG_STATE_NONE,
9 ODEBUG_STATE_INIT,
10 ODEBUG_STATE_INACTIVE,
11 ODEBUG_STATE_ACTIVE,
12 ODEBUG_STATE_DESTROYED,
13 ODEBUG_STATE_NOTAVAILABLE,
14 ODEBUG_STATE_MAX,
15 };
16
17 struct debug_obj_descr;
18
19 /**
20 * struct debug_obj - representaion of an tracked object
21 * @node: hlist node to link the object into the tracker list
22 * @state: tracked object state
23 * @astate: current active state
24 * @object: pointer to the real object
25 * @descr: pointer to an object type specific debug description structure
26 */
27 struct debug_obj {
28 struct hlist_node node;
29 enum debug_obj_state state;
30 unsigned int astate;
31 void *object;
32 struct debug_obj_descr *descr;
33 };
34
35 /**
36 * struct debug_obj_descr - object type specific debug description structure
37 *
38 * @name: name of the object typee
39 * @debug_hint: function returning address, which have associated
40 * kernel symbol, to allow identify the object
41 * @fixup_init: fixup function, which is called when the init check
42 * fails
43 * @fixup_activate: fixup function, which is called when the activate check
44 * fails
45 * @fixup_destroy: fixup function, which is called when the destroy check
46 * fails
47 * @fixup_free: fixup function, which is called when the free check
48 * fails
49 */
50 struct debug_obj_descr {
51 const char *name;
52 void *(*debug_hint) (void *addr);
53 int (*fixup_init) (void *addr, enum debug_obj_state state);
54 int (*fixup_activate) (void *addr, enum debug_obj_state state);
55 int (*fixup_destroy) (void *addr, enum debug_obj_state state);
56 int (*fixup_free) (void *addr, enum debug_obj_state state);
57 };
58
59 #ifdef CONFIG_DEBUG_OBJECTS
60 extern void debug_object_init (void *addr, struct debug_obj_descr *descr);
61 extern void
62 debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr);
63 extern void debug_object_activate (void *addr, struct debug_obj_descr *descr);
64 extern void debug_object_deactivate(void *addr, struct debug_obj_descr *descr);
65 extern void debug_object_destroy (void *addr, struct debug_obj_descr *descr);
66 extern void debug_object_free (void *addr, struct debug_obj_descr *descr);
67
68 /*
69 * Active state:
70 * - Set at 0 upon initialization.
71 * - Must return to 0 before deactivation.
72 */
73 extern void
74 debug_object_active_state(void *addr, struct debug_obj_descr *descr,
75 unsigned int expect, unsigned int next);
76
77 extern void debug_objects_early_init(void);
78 extern void debug_objects_mem_init(void);
79 #else
80 static inline void
debug_object_init(void * addr,struct debug_obj_descr * descr)81 debug_object_init (void *addr, struct debug_obj_descr *descr) { }
82 static inline void
debug_object_init_on_stack(void * addr,struct debug_obj_descr * descr)83 debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { }
84 static inline void
debug_object_activate(void * addr,struct debug_obj_descr * descr)85 debug_object_activate (void *addr, struct debug_obj_descr *descr) { }
86 static inline void
debug_object_deactivate(void * addr,struct debug_obj_descr * descr)87 debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { }
88 static inline void
debug_object_destroy(void * addr,struct debug_obj_descr * descr)89 debug_object_destroy (void *addr, struct debug_obj_descr *descr) { }
90 static inline void
debug_object_free(void * addr,struct debug_obj_descr * descr)91 debug_object_free (void *addr, struct debug_obj_descr *descr) { }
92
debug_objects_early_init(void)93 static inline void debug_objects_early_init(void) { }
debug_objects_mem_init(void)94 static inline void debug_objects_mem_init(void) { }
95 #endif
96
97 #ifdef CONFIG_DEBUG_OBJECTS_FREE
98 extern void debug_check_no_obj_freed(const void *address, unsigned long size);
99 #else
100 static inline void
debug_check_no_obj_freed(const void * address,unsigned long size)101 debug_check_no_obj_freed(const void *address, unsigned long size) { }
102 #endif
103
104 #endif
105