linux/include/linux/debugobjects.h
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   1#ifndef _LINUX_DEBUGOBJECTS_H
   2#define _LINUX_DEBUGOBJECTS_H
   3
   4#include <linux/list.h>
   5#include <linux/spinlock.h>
   6
   7enum 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
  17struct 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 */
  27struct 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 * @fixup_assert_init:  fixup function, which is called when the assert_init
  50 *                      check fails
  51 */
  52struct debug_obj_descr {
  53        const char              *name;
  54        void *(*debug_hint)     (void *addr);
  55        int (*fixup_init)       (void *addr, enum debug_obj_state state);
  56        int (*fixup_activate)   (void *addr, enum debug_obj_state state);
  57        int (*fixup_destroy)    (void *addr, enum debug_obj_state state);
  58        int (*fixup_free)       (void *addr, enum debug_obj_state state);
  59        int (*fixup_assert_init)(void *addr, enum debug_obj_state state);
  60};
  61
  62#ifdef CONFIG_DEBUG_OBJECTS
  63extern void debug_object_init      (void *addr, struct debug_obj_descr *descr);
  64extern void
  65debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr);
  66extern void debug_object_activate  (void *addr, struct debug_obj_descr *descr);
  67extern void debug_object_deactivate(void *addr, struct debug_obj_descr *descr);
  68extern void debug_object_destroy   (void *addr, struct debug_obj_descr *descr);
  69extern void debug_object_free      (void *addr, struct debug_obj_descr *descr);
  70extern void debug_object_assert_init(void *addr, struct debug_obj_descr *descr);
  71
  72/*
  73 * Active state:
  74 * - Set at 0 upon initialization.
  75 * - Must return to 0 before deactivation.
  76 */
  77extern void
  78debug_object_active_state(void *addr, struct debug_obj_descr *descr,
  79                          unsigned int expect, unsigned int next);
  80
  81extern void debug_objects_early_init(void);
  82extern void debug_objects_mem_init(void);
  83#else
  84static inline void
  85debug_object_init      (void *addr, struct debug_obj_descr *descr) { }
  86static inline void
  87debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { }
  88static inline void
  89debug_object_activate  (void *addr, struct debug_obj_descr *descr) { }
  90static inline void
  91debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { }
  92static inline void
  93debug_object_destroy   (void *addr, struct debug_obj_descr *descr) { }
  94static inline void
  95debug_object_free      (void *addr, struct debug_obj_descr *descr) { }
  96static inline void
  97debug_object_assert_init(void *addr, struct debug_obj_descr *descr) { }
  98
  99static inline void debug_objects_early_init(void) { }
 100static inline void debug_objects_mem_init(void) { }
 101#endif
 102
 103#ifdef CONFIG_DEBUG_OBJECTS_FREE
 104extern void debug_check_no_obj_freed(const void *address, unsigned long size);
 105#else
 106static inline void
 107debug_check_no_obj_freed(const void *address, unsigned long size) { }
 108#endif
 109
 110#endif
 111
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