include/linux/debugobjects.h

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