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  * @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
  81 debug_object_init      (void *addr, struct debug_obj_descr *descr) { }
  82 static inline void
  83 debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { }
  84 static inline void
  85 debug_object_activate  (void *addr, struct debug_obj_descr *descr) { }
  86 static inline void
  87 debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { }
  88 static inline void
  89 debug_object_destroy   (void *addr, struct debug_obj_descr *descr) { }
  90 static inline void
  91 debug_object_free      (void *addr, struct debug_obj_descr *descr) { }
  92
  93 static inline void debug_objects_early_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
 101 debug_check_no_obj_freed(const void *address, unsigned long size) { }
 102 #endif
 103
 104 #endif