include/linux/debugobjects.h

   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
  93 debug_object_init      (void *addr, const struct debug_obj_descr *descr) { }
  94 static inline void
  95 debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr) { }
  96 static inline int
  97 debug_object_activate  (void *addr, const struct debug_obj_descr *descr) { return 0; }
  98 static inline void
  99 debug_object_deactivate(void *addr, const struct debug_obj_descr *descr) { }
 100 static inline void
 101 debug_object_destroy   (void *addr, const struct debug_obj_descr *descr) { }
 102 static inline void
 103 debug_object_free      (void *addr, const struct debug_obj_descr *descr) { }
 104 static inline void
 105 debug_object_assert_init(void *addr, const struct debug_obj_descr *descr) { }
 106
 107 static inline void debug_objects_early_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
 115 debug_check_no_obj_freed(const void *address, unsigned long size) { }
 116 #endif
 117
 118 #endif