1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_DEBUGOBJECTS_H
3 #define _LINUX_DEBUGOBJECTS_H
4
5 #include <linux/list.h>
6 #include <linux/spinlock.h>
7
8 enum debug_obj_state {
9 ODEBUG_STATE_NONE,
10 ODEBUG_STATE_INIT,
11 ODEBUG_STATE_INACTIVE,
12 ODEBUG_STATE_ACTIVE,
13 ODEBUG_STATE_DESTROYED,
14 ODEBUG_STATE_NOTAVAILABLE,
15 ODEBUG_STATE_MAX,
16 };
17
18 struct debug_obj_descr;
19
20 /**
21 * struct debug_obj - representation of an tracked object
22 * @node: hlist node to link the object into the tracker list
23 * @state: tracked object state
24 * @astate: current active state
25 * @object: pointer to the real object
26 * @batch_last: pointer to the last hlist node in a batch
27 * @descr: pointer to an object type specific debug description structure
28 */
29 struct debug_obj {
30 struct hlist_node node;
31 enum debug_obj_state state;
32 unsigned int astate;
33 union {
34 void *object;
35 struct hlist_node *batch_last;
36 };
37 const struct debug_obj_descr *descr;
38 };
39
40 /**
41 * struct debug_obj_descr - object type specific debug description structure
42 *
43 * @name: name of the object typee
44 * @debug_hint: function returning address, which have associated
45 * kernel symbol, to allow identify the object
46 * @is_static_object: return true if the obj is static, otherwise return false
47 * @fixup_init: fixup function, which is called when the init check
48 * fails. All fixup functions must return true if fixup
49 * was successful, otherwise return false
50 * @fixup_activate: fixup function, which is called when the activate check
51 * fails
52 * @fixup_destroy: fixup function, which is called when the destroy check
53 * fails
54 * @fixup_free: fixup function, which is called when the free check
55 * fails
56 * @fixup_assert_init: fixup function, which is called when the assert_init
57 * check fails
58 */
59 struct debug_obj_descr {
60 const char *name;
61 void *(*debug_hint)(void *addr);
62 bool (*is_static_object)(void *addr);
63 bool (*fixup_init)(void *addr, enum debug_obj_state state);
64 bool (*fixup_activate)(void *addr, enum debug_obj_state state);
65 bool (*fixup_destroy)(void *addr, enum debug_obj_state state);
66 bool (*fixup_free)(void *addr, enum debug_obj_state state);
67 bool (*fixup_assert_init)(void *addr, enum debug_obj_state state);
68 };
69
70 #ifdef CONFIG_DEBUG_OBJECTS
71 extern void debug_object_init (void *addr, const struct debug_obj_descr *descr);
72 extern void
73 debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr);
74 extern int debug_object_activate (void *addr, const struct debug_obj_descr *descr);
75 extern void debug_object_deactivate(void *addr, const struct debug_obj_descr *descr);
76 extern void debug_object_destroy (void *addr, const struct debug_obj_descr *descr);
77 extern void debug_object_free (void *addr, const struct debug_obj_descr *descr);
78 extern void debug_object_assert_init(void *addr, const struct debug_obj_descr *descr);
79
80 /*
81 * Active state:
82 * - Set at 0 upon initialization.
83 * - Must return to 0 before deactivation.
84 */
85 extern void
86 debug_object_active_state(void *addr, const struct debug_obj_descr *descr,
87 unsigned int expect, unsigned int next);
88
89 extern void debug_objects_early_init(void);
90 extern void debug_objects_mem_init(void);
91 #else
92 static inline void
debug_object_init(void * addr,const struct debug_obj_descr * descr)93 debug_object_init (void *addr, const struct debug_obj_descr *descr) { }
94 static inline void
debug_object_init_on_stack(void * addr,const struct debug_obj_descr * descr)95 debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr) { }
96 static inline int
debug_object_activate(void * addr,const struct debug_obj_descr * descr)97 debug_object_activate (void *addr, const struct debug_obj_descr *descr) { return 0; }
98 static inline void
debug_object_deactivate(void * addr,const struct debug_obj_descr * descr)99 debug_object_deactivate(void *addr, const struct debug_obj_descr *descr) { }
100 static inline void
debug_object_destroy(void * addr,const struct debug_obj_descr * descr)101 debug_object_destroy (void *addr, const struct debug_obj_descr *descr) { }
102 static inline void
debug_object_free(void * addr,const struct debug_obj_descr * descr)103 debug_object_free (void *addr, const struct debug_obj_descr *descr) { }
104 static inline void
debug_object_assert_init(void * addr,const struct debug_obj_descr * descr)105 debug_object_assert_init(void *addr, const struct debug_obj_descr *descr) { }
106
debug_objects_early_init(void)107 static inline void debug_objects_early_init(void) { }
debug_objects_mem_init(void)108 static inline void debug_objects_mem_init(void) { }
109 #endif
110
111 #ifdef CONFIG_DEBUG_OBJECTS_FREE
112 extern void debug_check_no_obj_freed(const void *address, unsigned long size);
113 #else
114 static inline void
debug_check_no_obj_freed(const void * address,unsigned long size)115 debug_check_no_obj_freed(const void *address, unsigned long size) { }
116 #endif
117
118 #endif
119