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 * @descr: pointer to an object type specific debug description structure
27 */
28 struct debug_obj {
29 struct hlist_node node;
30 enum debug_obj_state state;
31 unsigned int astate;
32 void *object;
33 const struct debug_obj_descr *descr;
34 };
35
36 /**
37 * struct debug_obj_descr - object type specific debug description structure
38 *
39 * @name: name of the object typee
40 * @debug_hint: function returning address, which have associated
41 * kernel symbol, to allow identify the object
42 * @is_static_object: return true if the obj is static, otherwise return false
43 * @fixup_init: fixup function, which is called when the init check
44 * fails. All fixup functions must return true if fixup
45 * was successful, otherwise return false
46 * @fixup_activate: fixup function, which is called when the activate check
47 * fails
48 * @fixup_destroy: fixup function, which is called when the destroy check
49 * fails
50 * @fixup_free: fixup function, which is called when the free check
51 * fails
52 * @fixup_assert_init: fixup function, which is called when the assert_init
53 * check fails
54 */
55 struct debug_obj_descr {
56 const char *name;
57 void *(*debug_hint)(void *addr);
58 bool (*is_static_object)(void *addr);
59 bool (*fixup_init)(void *addr, enum debug_obj_state state);
60 bool (*fixup_activate)(void *addr, enum debug_obj_state state);
61 bool (*fixup_destroy)(void *addr, enum debug_obj_state state);
62 bool (*fixup_free)(void *addr, enum debug_obj_state state);
63 bool (*fixup_assert_init)(void *addr, enum debug_obj_state state);
64 };
65
66 #ifdef CONFIG_DEBUG_OBJECTS
67 extern void debug_object_init (void *addr, const struct debug_obj_descr *descr);
68 extern void
69 debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr);
70 extern int debug_object_activate (void *addr, const struct debug_obj_descr *descr);
71 extern void debug_object_deactivate(void *addr, const struct debug_obj_descr *descr);
72 extern void debug_object_destroy (void *addr, const struct debug_obj_descr *descr);
73 extern void debug_object_free (void *addr, const struct debug_obj_descr *descr);
74 extern void debug_object_assert_init(void *addr, const struct debug_obj_descr *descr);
75
76 /*
77 * Active state:
78 * - Set at 0 upon initialization.
79 * - Must return to 0 before deactivation.
80 */
81 extern void
82 debug_object_active_state(void *addr, const struct debug_obj_descr *descr,
83 unsigned int expect, unsigned int next);
84
85 extern void debug_objects_early_init(void);
86 extern void debug_objects_mem_init(void);
87 #else
88 static inline void
debug_object_init(void * addr,const struct debug_obj_descr * descr)89 debug_object_init (void *addr, const struct debug_obj_descr *descr) { }
90 static inline void
debug_object_init_on_stack(void * addr,const struct debug_obj_descr * descr)91 debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr) { }
92 static inline int
debug_object_activate(void * addr,const struct debug_obj_descr * descr)93 debug_object_activate (void *addr, const struct debug_obj_descr *descr) { return 0; }
94 static inline void
debug_object_deactivate(void * addr,const struct debug_obj_descr * descr)95 debug_object_deactivate(void *addr, const struct debug_obj_descr *descr) { }
96 static inline void
debug_object_destroy(void * addr,const struct debug_obj_descr * descr)97 debug_object_destroy (void *addr, const struct debug_obj_descr *descr) { }
98 static inline void
debug_object_free(void * addr,const struct debug_obj_descr * descr)99 debug_object_free (void *addr, const struct debug_obj_descr *descr) { }
100 static inline void
debug_object_assert_init(void * addr,const struct debug_obj_descr * descr)101 debug_object_assert_init(void *addr, const struct debug_obj_descr *descr) { }
102
debug_objects_early_init(void)103 static inline void debug_objects_early_init(void) { }
debug_objects_mem_init(void)104 static inline void debug_objects_mem_init(void) { }
105 #endif
106
107 #ifdef CONFIG_DEBUG_OBJECTS_FREE
108 extern void debug_check_no_obj_freed(const void *address, unsigned long size);
109 #else
110 static inline void
debug_check_no_obj_freed(const void * address,unsigned long size)111 debug_check_no_obj_freed(const void *address, unsigned long size) { }
112 #endif
113
114 #endif
115