/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_DEBUGOBJECTS_H
#define _LINUX_DEBUGOBJECTS_H
#include <linux/list.h>
#include <linux/spinlock.h>
enum debug_obj_state {
ODEBUG_STATE_NONE,
ODEBUG_STATE_INIT,
ODEBUG_STATE_INACTIVE,
ODEBUG_STATE_ACTIVE,
ODEBUG_STATE_DESTROYED,
ODEBUG_STATE_NOTAVAILABLE,
ODEBUG_STATE_MAX,
};
struct debug_obj_descr;
/**
* struct debug_obj - representation of an tracked object
* @ node : hlist node to link the object into the tracker list
* @ state : tracked object state
* @ astate : current active state
* @ object : pointer to the real object
* @ batch_last : pointer to the last hlist node in a batch
* @ descr : pointer to an object type specific debug description structure
*/
struct debug_obj {
struct hlist_node node;
enum debug_obj_state state;
unsigned int astate;
union {
void *object;
struct hlist_node *batch_last;
};
const struct debug_obj_descr *descr;
};
/**
* struct debug_obj_descr - object type specific debug description structure
*
* @ name : name of the object typee
* @ debug_hint : function returning address , which have associated
* kernel symbol , to allow identify the object
* @ is_static_object : return true if the obj is static , otherwise return false
* @ fixup_init : fixup function , which is called when the init check
* fails . All fixup functions must return true if fixup
* was successful , otherwise return false
* @ fixup_activate : fixup function , which is called when the activate check
* fails
* @ fixup_destroy : fixup function , which is called when the destroy check
* fails
* @ fixup_free : fixup function , which is called when the free check
* fails
* @ fixup_assert_init : fixup function , which is called when the assert_init
* check fails
*/
struct debug_obj_descr {
const char *name;
void *(*debug_hint)(void *addr);
bool (*is_static_object)(void *addr);
bool (*fixup_init)(void *addr, enum debug_obj_state state);
bool (*fixup_activate)(void *addr, enum debug_obj_state state);
bool (*fixup_destroy)(void *addr, enum debug_obj_state state);
bool (*fixup_free)(void *addr, enum debug_obj_state state);
bool (*fixup_assert_init)(void *addr, enum debug_obj_state state);
};
#ifdef CONFIG_DEBUG_OBJECTS
extern void debug_object_init (void *addr, const struct debug_obj_descr *descr);
extern void
debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr);
extern int debug_object_activate (void *addr, const struct debug_obj_descr *descr);
extern void debug_object_deactivate(void *addr, const struct debug_obj_descr *descr);
extern void debug_object_destroy (void *addr, const struct debug_obj_descr *descr);
extern void debug_object_free (void *addr, const struct debug_obj_descr *descr);
extern void debug_object_assert_init(void *addr, const struct debug_obj_descr *descr);
/*
* Active state :
* - Set at 0 upon initialization .
* - Must return to 0 before deactivation .
*/
extern void
debug_object_active_state(void *addr, const struct debug_obj_descr *descr,
unsigned int expect, unsigned int next);
extern void debug_objects_early_init(void );
extern void debug_objects_mem_init(void );
#else
static inline void
debug_object_init (void *addr, const struct debug_obj_descr *descr) { }
static inline void
debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr) { }
static inline int
debug_object_activate (void *addr, const struct debug_obj_descr *descr) { return 0 ; }
static inline void
debug_object_deactivate(void *addr, const struct debug_obj_descr *descr) { }
static inline void
debug_object_destroy (void *addr, const struct debug_obj_descr *descr) { }
static inline void
debug_object_free (void *addr, const struct debug_obj_descr *descr) { }
static inline void
debug_object_assert_init(void *addr, const struct debug_obj_descr *descr) { }
static inline void debug_objects_early_init(void ) { }
static inline void debug_objects_mem_init(void ) { }
#endif
#ifdef CONFIG_DEBUG_OBJECTS_FREE
extern void debug_check_no_obj_freed(const void *address, unsigned long size);
#else
static inline void
debug_check_no_obj_freed(const void *address, unsigned long size) { }
#endif
#endif
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