[mirror_ubuntu-bionic-kernel.git] / include / linux / ftrace.h

/*
 * Ftrace header.  For implementation details beyond the random comments
 * scattered below, see: Documentation/trace/ftrace-design.txt
 */

#ifndef _LINUX_FTRACE_H
#define _LINUX_FTRACE_H

#include <linux/trace_clock.h>
#include <linux/kallsyms.h>
#include <linux/linkage.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/ktime.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/fs.h>

#include <asm/ftrace.h>

#ifdef CONFIG_FUNCTION_TRACER

extern int ftrace_enabled;
extern int
ftrace_enable_sysctl(struct ctl_table *table, int write,
		     void __user *buffer, size_t *lenp,
		     loff_t *ppos);

typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);

struct ftrace_ops {
	ftrace_func_t	  func;
	struct ftrace_ops *next;
};

extern int function_trace_stop;

/*
 * Type of the current tracing.
 */
enum ftrace_tracing_type_t {
	FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
	FTRACE_TYPE_RETURN,	/* Hook the return of the function */
};

/* Current tracing type, default is FTRACE_TYPE_ENTER */
extern enum ftrace_tracing_type_t ftrace_tracing_type;

/**
 * ftrace_stop - stop function tracer.
 *
 * A quick way to stop the function tracer. Note this an on off switch,
 * it is not something that is recursive like preempt_disable.
 * This does not disable the calling of mcount, it only stops the
 * calling of functions from mcount.
 */
static inline void ftrace_stop(void)
{
	function_trace_stop = 1;
}

/**
 * ftrace_start - start the function tracer.
 *
 * This function is the inverse of ftrace_stop. This does not enable
 * the function tracing if the function tracer is disabled. This only
 * sets the function tracer flag to continue calling the functions
 * from mcount.
 */
static inline void ftrace_start(void)
{
	function_trace_stop = 0;
}

/*
 * The ftrace_ops must be a static and should also
 * be read_mostly.  These functions do modify read_mostly variables
 * so use them sparely. Never free an ftrace_op or modify the
 * next pointer after it has been registered. Even after unregistering
 * it, the next pointer may still be used internally.
 */
int register_ftrace_function(struct ftrace_ops *ops);
int unregister_ftrace_function(struct ftrace_ops *ops);
void clear_ftrace_function(void);

extern void ftrace_stub(unsigned long a0, unsigned long a1);

#else /* !CONFIG_FUNCTION_TRACER */
/*
 * (un)register_ftrace_function must be a macro since the ops parameter
 * must not be evaluated.
 */
#define register_ftrace_function(ops) ({ 0; })
#define unregister_ftrace_function(ops) ({ 0; })
static inline void clear_ftrace_function(void) { }
static inline void ftrace_kill(void) { }
static inline void ftrace_stop(void) { }
static inline void ftrace_start(void) { }
#endif /* CONFIG_FUNCTION_TRACER */

#ifdef CONFIG_STACK_TRACER
extern int stack_tracer_enabled;
int
stack_trace_sysctl(struct ctl_table *table, int write,
		   void __user *buffer, size_t *lenp,
		   loff_t *ppos);
#endif

struct ftrace_func_command {
	struct list_head	list;
	char			*name;
	int			(*func)(char *func, char *cmd,
					char *params, int enable);
};

#ifdef CONFIG_DYNAMIC_FTRACE

int ftrace_arch_code_modify_prepare(void);
int ftrace_arch_code_modify_post_process(void);

struct seq_file;

struct ftrace_probe_ops {
	void			(*func)(unsigned long ip,
					unsigned long parent_ip,
					void **data);
	int			(*callback)(unsigned long ip, void **data);
	void			(*free)(void **data);
	int			(*print)(struct seq_file *m,
					 unsigned long ip,
					 struct ftrace_probe_ops *ops,
					 void *data);
};

extern int
register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
			      void *data);
extern void
unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
				void *data);
extern void
unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
extern void unregister_ftrace_function_probe_all(char *glob);

extern int ftrace_text_reserved(void *start, void *end);

enum {
	FTRACE_FL_FREE		= (1 << 0),
	FTRACE_FL_ENABLED	= (1 << 1),
};

struct dyn_ftrace {
	union {
		unsigned long		ip; /* address of mcount call-site */
		struct dyn_ftrace	*freelist;
	};
	union {
		unsigned long		flags;
		struct dyn_ftrace	*newlist;
	};
	struct dyn_arch_ftrace		arch;
};

int ftrace_force_update(void);
void ftrace_set_filter(unsigned char *buf, int len, int reset);

int register_ftrace_command(struct ftrace_func_command *cmd);
int unregister_ftrace_command(struct ftrace_func_command *cmd);

/* defined in arch */
extern int ftrace_ip_converted(unsigned long ip);
extern int ftrace_dyn_arch_init(void *data);
extern int ftrace_update_ftrace_func(ftrace_func_t func);
extern void ftrace_caller(void);
extern void ftrace_call(void);
extern void mcount_call(void);

#ifndef FTRACE_ADDR
#define FTRACE_ADDR ((unsigned long)ftrace_caller)
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
extern void ftrace_graph_caller(void);
extern int ftrace_enable_ftrace_graph_caller(void);
extern int ftrace_disable_ftrace_graph_caller(void);
#else
static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
#endif

/**
 * ftrace_make_nop - convert code into nop
 * @mod: module structure if called by module load initialization
 * @rec: the mcount call site record
 * @addr: the address that the call site should be calling
 *
 * This is a very sensitive operation and great care needs
 * to be taken by the arch.  The operation should carefully
 * read the location, check to see if what is read is indeed
 * what we expect it to be, and then on success of the compare,
 * it should write to the location.
 *
 * The code segment at @rec->ip should be a caller to @addr
 *
 * Return must be:
 *  0 on success
 *  -EFAULT on error reading the location
 *  -EINVAL on a failed compare of the contents
 *  -EPERM  on error writing to the location
 * Any other value will be considered a failure.
 */
extern int ftrace_make_nop(struct module *mod,
			   struct dyn_ftrace *rec, unsigned long addr);

/**
 * ftrace_make_call - convert a nop call site into a call to addr
 * @rec: the mcount call site record
 * @addr: the address that the call site should call
 *
 * This is a very sensitive operation and great care needs
 * to be taken by the arch.  The operation should carefully
 * read the location, check to see if what is read is indeed
 * what we expect it to be, and then on success of the compare,
 * it should write to the location.
 *
 * The code segment at @rec->ip should be a nop
 *
 * Return must be:
 *  0 on success
 *  -EFAULT on error reading the location
 *  -EINVAL on a failed compare of the contents
 *  -EPERM  on error writing to the location
 * Any other value will be considered a failure.
 */
extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);

/* May be defined in arch */
extern int ftrace_arch_read_dyn_info(char *buf, int size);

extern int skip_trace(unsigned long ip);

extern void ftrace_disable_daemon(void);
extern void ftrace_enable_daemon(void);
#else
static inline int skip_trace(unsigned long ip) { return 0; }
static inline int ftrace_force_update(void) { return 0; }
static inline void ftrace_set_filter(unsigned char *buf, int len, int reset)
{
}
static inline void ftrace_disable_daemon(void) { }
static inline void ftrace_enable_daemon(void) { }
static inline void ftrace_release_mod(struct module *mod) {}
static inline int register_ftrace_command(struct ftrace_func_command *cmd)
{
	return -EINVAL;
}
static inline int unregister_ftrace_command(char *cmd_name)
{
	return -EINVAL;
}
static inline int ftrace_text_reserved(void *start, void *end)
{
	return 0;
}
#endif /* CONFIG_DYNAMIC_FTRACE */

/* totally disable ftrace - can not re-enable after this */
void ftrace_kill(void);

static inline void tracer_disable(void)
{
#ifdef CONFIG_FUNCTION_TRACER
	ftrace_enabled = 0;
#endif
}

/*
 * Ftrace disable/restore without lock. Some synchronization mechanism
 * must be used to prevent ftrace_enabled to be changed between
 * disable/restore.
 */
static inline int __ftrace_enabled_save(void)
{
#ifdef CONFIG_FUNCTION_TRACER
	int saved_ftrace_enabled = ftrace_enabled;
	ftrace_enabled = 0;
	return saved_ftrace_enabled;
#else
	return 0;
#endif
}

static inline void __ftrace_enabled_restore(int enabled)
{
#ifdef CONFIG_FUNCTION_TRACER
	ftrace_enabled = enabled;
#endif
}

#ifndef HAVE_ARCH_CALLER_ADDR
# ifdef CONFIG_FRAME_POINTER
#  define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
#  define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
#  define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
#  define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
#  define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
#  define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
#  define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
# else
#  define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
#  define CALLER_ADDR1 0UL
#  define CALLER_ADDR2 0UL
#  define CALLER_ADDR3 0UL
#  define CALLER_ADDR4 0UL
#  define CALLER_ADDR5 0UL
#  define CALLER_ADDR6 0UL
# endif
#endif /* ifndef HAVE_ARCH_CALLER_ADDR */

#ifdef CONFIG_IRQSOFF_TRACER
  extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
  extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
#else
  static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
  static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
#endif

#ifdef CONFIG_PREEMPT_TRACER
  extern void trace_preempt_on(unsigned long a0, unsigned long a1);
  extern void trace_preempt_off(unsigned long a0, unsigned long a1);
#else
  static inline void trace_preempt_on(unsigned long a0, unsigned long a1) { }
  static inline void trace_preempt_off(unsigned long a0, unsigned long a1) { }
#endif

#ifdef CONFIG_FTRACE_MCOUNT_RECORD
extern void ftrace_init(void);
#else
static inline void ftrace_init(void) { }
#endif

/*
 * Structure that defines an entry function trace.
 */
struct ftrace_graph_ent {
	unsigned long func; /* Current function */
	int depth;
};

/*
 * Structure that defines a return function trace.
 */
struct ftrace_graph_ret {
	unsigned long func; /* Current function */
	unsigned long long calltime;
	unsigned long long rettime;
	/* Number of functions that overran the depth limit for current task */
	unsigned long overrun;
	int depth;
};

/* Type of the callback handlers for tracing function graph*/
typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

/* for init task */
#define INIT_FTRACE_GRAPH		.ret_stack = NULL,

/*
 * Stack of return addresses for functions
 * of a thread.
 * Used in struct thread_info
 */
struct ftrace_ret_stack {
	unsigned long ret;
	unsigned long func;
	unsigned long long calltime;
	unsigned long long subtime;
	unsigned long fp;
};

/*
 * Primary handler of a function return.
 * It relays on ftrace_return_to_handler.
 * Defined in entry_32/64.S
 */
extern void return_to_handler(void);

extern int
ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
			 unsigned long frame_pointer);

/*
 * Sometimes we don't want to trace a function with the function
 * graph tracer but we want them to keep traced by the usual function
 * tracer if the function graph tracer is not configured.
 */
#define __notrace_funcgraph		notrace

/*
 * We want to which function is an entrypoint of a hardirq.
 * That will help us to put a signal on output.
 */
#define __irq_entry		 __attribute__((__section__(".irqentry.text")))

/* Limits of hardirq entrypoints */
extern char __irqentry_text_start[];
extern char __irqentry_text_end[];

#define FTRACE_RETFUNC_DEPTH 50
#define FTRACE_RETSTACK_ALLOC_SIZE 32
extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
				trace_func_graph_ent_t entryfunc);

extern void ftrace_graph_stop(void);

/* The current handlers in use */
extern trace_func_graph_ret_t ftrace_graph_return;
extern trace_func_graph_ent_t ftrace_graph_entry;

extern void unregister_ftrace_graph(void);

extern void ftrace_graph_init_task(struct task_struct *t);
extern void ftrace_graph_exit_task(struct task_struct *t);
extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);

static inline int task_curr_ret_stack(struct task_struct *t)
{
	return t->curr_ret_stack;
}

static inline void pause_graph_tracing(void)
{
	atomic_inc(&current->tracing_graph_pause);
}

static inline void unpause_graph_tracing(void)
{
	atomic_dec(&current->tracing_graph_pause);
}
#else /* !CONFIG_FUNCTION_GRAPH_TRACER */

#define __notrace_funcgraph
#define __irq_entry
#define INIT_FTRACE_GRAPH

static inline void ftrace_graph_init_task(struct task_struct *t) { }
static inline void ftrace_graph_exit_task(struct task_struct *t) { }
static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }

static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
			  trace_func_graph_ent_t entryfunc)
{
	return -1;
}
static inline void unregister_ftrace_graph(void) { }

static inline int task_curr_ret_stack(struct task_struct *tsk)
{
	return -1;
}

static inline void pause_graph_tracing(void) { }
static inline void unpause_graph_tracing(void) { }
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */

#ifdef CONFIG_TRACING

/* flags for current->trace */
enum {
	TSK_TRACE_FL_TRACE_BIT	= 0,
	TSK_TRACE_FL_GRAPH_BIT	= 1,
};
enum {
	TSK_TRACE_FL_TRACE	= 1 << TSK_TRACE_FL_TRACE_BIT,
	TSK_TRACE_FL_GRAPH	= 1 << TSK_TRACE_FL_GRAPH_BIT,
};

static inline void set_tsk_trace_trace(struct task_struct *tsk)
{
	set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
}

static inline void clear_tsk_trace_trace(struct task_struct *tsk)
{
	clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
}

static inline int test_tsk_trace_trace(struct task_struct *tsk)
{
	return tsk->trace & TSK_TRACE_FL_TRACE;
}

static inline void set_tsk_trace_graph(struct task_struct *tsk)
{
	set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
}

static inline void clear_tsk_trace_graph(struct task_struct *tsk)
{
	clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
}

static inline int test_tsk_trace_graph(struct task_struct *tsk)
{
	return tsk->trace & TSK_TRACE_FL_GRAPH;
}

enum ftrace_dump_mode;

extern enum ftrace_dump_mode ftrace_dump_on_oops;

#ifdef CONFIG_PREEMPT
#define INIT_TRACE_RECURSION		.trace_recursion = 0,
#endif

#endif /* CONFIG_TRACING */

#ifndef INIT_TRACE_RECURSION
#define INIT_TRACE_RECURSION
#endif

#ifdef CONFIG_FTRACE_SYSCALLS

unsigned long arch_syscall_addr(int nr);

#endif /* CONFIG_FTRACE_SYSCALLS */

#endif /* _LINUX_FTRACE_H */
Commit	Line	Data
9849ed4d MF	1	/*
	2	* Ftrace header. For implementation details beyond the random comments
	3	* scattered below, see: Documentation/trace/ftrace-design.txt
	4	*/
	5
16444a8a ACM	6	#ifndef _LINUX_FTRACE_H
	7	#define _LINUX_FTRACE_H
	8
0012693a	9	#include <linux/trace_clock.h>
5601020f	10	#include <linux/kallsyms.h>
0012693a	11	#include <linux/linkage.h>
ea4e2bc4	12	#include <linux/bitops.h>
0012693a FW	13	#include <linux/module.h>
0012693a FW	14	#include <linux/ktime.h>
21a8c466	15	#include <linux/sched.h>
0012693a FW	16	#include <linux/types.h>
	17	#include <linux/init.h>
	18	#include <linux/fs.h>
16444a8a	19
c79a61f5 UKK	20	#include <asm/ftrace.h>
c79a61f5 UKK	21
606576ce	22	#ifdef CONFIG_FUNCTION_TRACER
3e1932ad	23
b0fc494f SR	24	extern int ftrace_enabled;
	25	extern int
	26	ftrace_enable_sysctl(struct ctl_table *table, int write,
8d65af78	27	void __user buffer, size_t lenp,
b0fc494f SR	28	loff_t *ppos);
b0fc494f SR	29
16444a8a ACM	30	typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
	31
	32	struct ftrace_ops {
	33	ftrace_func_t func;
	34	struct ftrace_ops *next;
	35	};
	36
60a7ecf4 SR	37	extern int function_trace_stop;
60a7ecf4 SR	38
e7d3737e FW	39	/*
	40	* Type of the current tracing.
	41	*/
	42	enum ftrace_tracing_type_t {
	43	FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
	44	FTRACE_TYPE_RETURN, /* Hook the return of the function */
	45	};
	46
	47	/* Current tracing type, default is FTRACE_TYPE_ENTER */
	48	extern enum ftrace_tracing_type_t ftrace_tracing_type;
	49
60a7ecf4 SR	50	/**
	51	* ftrace_stop - stop function tracer.
	52	*
	53	* A quick way to stop the function tracer. Note this an on off switch,
	54	* it is not something that is recursive like preempt_disable.
	55	* This does not disable the calling of mcount, it only stops the
	56	* calling of functions from mcount.
	57	*/
	58	static inline void ftrace_stop(void)
	59	{
	60	function_trace_stop = 1;
	61	}
	62
	63	/**
	64	* ftrace_start - start the function tracer.
	65	*
	66	* This function is the inverse of ftrace_stop. This does not enable
	67	* the function tracing if the function tracer is disabled. This only
	68	* sets the function tracer flag to continue calling the functions
	69	* from mcount.
	70	*/
	71	static inline void ftrace_start(void)
	72	{
	73	function_trace_stop = 0;
	74	}
	75
16444a8a ACM	76	/*
	77	* The ftrace_ops must be a static and should also
	78	* be read_mostly. These functions do modify read_mostly variables
	79	* so use them sparely. Never free an ftrace_op or modify the
	80	* next pointer after it has been registered. Even after unregistering
	81	* it, the next pointer may still be used internally.
	82	*/
	83	int register_ftrace_function(struct ftrace_ops *ops);
	84	int unregister_ftrace_function(struct ftrace_ops *ops);
	85	void clear_ftrace_function(void);
	86
	87	extern void ftrace_stub(unsigned long a0, unsigned long a1);
16444a8a	88
606576ce	89	#else /* !CONFIG_FUNCTION_TRACER */
4dbf6bc2 SR	90	/*
	91	* (un)register_ftrace_function must be a macro since the ops parameter
	92	* must not be evaluated.
	93	*/
	94	#define register_ftrace_function(ops) ({ 0; })
	95	#define unregister_ftrace_function(ops) ({ 0; })
	96	static inline void clear_ftrace_function(void) { }
81adbdc0	97	static inline void ftrace_kill(void) { }
60a7ecf4 SR	98	static inline void ftrace_stop(void) { }
60a7ecf4 SR	99	static inline void ftrace_start(void) { }
606576ce	100	#endif /* CONFIG_FUNCTION_TRACER */
352ad25a	101
f38f1d2a SR	102	#ifdef CONFIG_STACK_TRACER
	103	extern int stack_tracer_enabled;
	104	int
	105	stack_trace_sysctl(struct ctl_table *table, int write,
8d65af78	106	void __user buffer, size_t lenp,
f38f1d2a SR	107	loff_t *ppos);
	108	#endif
	109
f6180773 SR	110	struct ftrace_func_command {
	111	struct list_head list;
	112	char *name;
	113	int (func)(char func, char *cmd,
	114	char *params, int enable);
	115	};
	116
3d083395	117	#ifdef CONFIG_DYNAMIC_FTRACE
31e88909	118
000ab691 SR	119	int ftrace_arch_code_modify_prepare(void);
	120	int ftrace_arch_code_modify_post_process(void);
	121
809dcf29 SR	122	struct seq_file;
809dcf29 SR	123
b6887d79	124	struct ftrace_probe_ops {
59df055f SR	125	void (*func)(unsigned long ip,
	126	unsigned long parent_ip,
	127	void **data);
	128	int (callback)(unsigned long ip, void *data);
	129	void (free)(void *data);
809dcf29 SR	130	int (print)(struct seq_file m,
809dcf29 SR	131	unsigned long ip,
b6887d79	132	struct ftrace_probe_ops *ops,
809dcf29	133	void *data);
59df055f SR	134	};
	135
	136	extern int
b6887d79	137	register_ftrace_function_probe(char glob, struct ftrace_probe_ops ops,
59df055f SR	138	void *data);
59df055f SR	139	extern void
b6887d79	140	unregister_ftrace_function_probe(char glob, struct ftrace_probe_ops ops,
59df055f SR	141	void *data);
59df055f SR	142	extern void
b6887d79 SR	143	unregister_ftrace_function_probe_func(char glob, struct ftrace_probe_ops ops);
b6887d79 SR	144	extern void unregister_ftrace_function_probe_all(char *glob);
59df055f	145
2cfa1978 MH	146	extern int ftrace_text_reserved(void start, void end);
2cfa1978 MH	147
3c1720f0	148	enum {
37ad5084	149	FTRACE_FL_FREE = (1 << 0),
1cf41dd7	150	FTRACE_FL_ENABLED = (1 << 1),
3c1720f0 SR	151	};
3c1720f0 SR	152
3d083395	153	struct dyn_ftrace {
ee000b7f LJ	154	union {
	155	unsigned long ip; /* address of mcount call-site */
	156	struct dyn_ftrace *freelist;
	157	};
	158	union {
	159	unsigned long flags;
	160	struct dyn_ftrace *newlist;
	161	};
	162	struct dyn_arch_ftrace arch;
3d083395 SR	163	};
3d083395 SR	164
e1c08bdd	165	int ftrace_force_update(void);
77a2b37d	166	void ftrace_set_filter(unsigned char *buf, int len, int reset);
e1c08bdd	167
f6180773 SR	168	int register_ftrace_command(struct ftrace_func_command *cmd);
	169	int unregister_ftrace_command(struct ftrace_func_command *cmd);
	170
3d083395	171	/* defined in arch */
3c1720f0	172	extern int ftrace_ip_converted(unsigned long ip);
d61f82d0	173	extern int ftrace_dyn_arch_init(void *data);
d61f82d0 SR	174	extern int ftrace_update_ftrace_func(ftrace_func_t func);
	175	extern void ftrace_caller(void);
	176	extern void ftrace_call(void);
	177	extern void mcount_call(void);
f0001207 SL	178
	179	#ifndef FTRACE_ADDR
	180	#define FTRACE_ADDR ((unsigned long)ftrace_caller)
	181	#endif
fb52607a FW	182	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
fb52607a FW	183	extern void ftrace_graph_caller(void);
5a45cfe1 SR	184	extern int ftrace_enable_ftrace_graph_caller(void);
	185	extern int ftrace_disable_ftrace_graph_caller(void);
	186	#else
	187	static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
	188	static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
e7d3737e	189	#endif
ad90c0e3	190
31e88909	191	/**
57794a9d	192	* ftrace_make_nop - convert code into nop
31e88909 SR	193	* @mod: module structure if called by module load initialization
	194	* @rec: the mcount call site record
	195	* @addr: the address that the call site should be calling
	196	*
	197	* This is a very sensitive operation and great care needs
	198	* to be taken by the arch. The operation should carefully
	199	* read the location, check to see if what is read is indeed
	200	* what we expect it to be, and then on success of the compare,
	201	* it should write to the location.
	202	*
	203	* The code segment at @rec->ip should be a caller to @addr
	204	*
	205	* Return must be:
	206	* 0 on success
	207	* -EFAULT on error reading the location
	208	* -EINVAL on a failed compare of the contents
	209	* -EPERM on error writing to the location
	210	* Any other value will be considered a failure.
	211	*/
	212	extern int ftrace_make_nop(struct module *mod,
	213	struct dyn_ftrace *rec, unsigned long addr);
a26a2a27	214
593eb8a2	215	/**
31e88909 SR	216	* ftrace_make_call - convert a nop call site into a call to addr
	217	* @rec: the mcount call site record
	218	* @addr: the address that the call site should call
593eb8a2 SR	219	*
	220	* This is a very sensitive operation and great care needs
	221	* to be taken by the arch. The operation should carefully
	222	* read the location, check to see if what is read is indeed
	223	* what we expect it to be, and then on success of the compare,
	224	* it should write to the location.
	225	*
31e88909 SR	226	* The code segment at @rec->ip should be a nop
31e88909 SR	227	*
593eb8a2 SR	228	* Return must be:
	229	* 0 on success
	230	* -EFAULT on error reading the location
	231	* -EINVAL on a failed compare of the contents
	232	* -EPERM on error writing to the location
	233	* Any other value will be considered a failure.
	234	*/
31e88909 SR	235	extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
31e88909 SR	236
31e88909 SR	237	/* May be defined in arch */
31e88909 SR	238	extern int ftrace_arch_read_dyn_info(char *buf, int size);
593eb8a2	239
ecea656d AS	240	extern int skip_trace(unsigned long ip);
ecea656d AS	241
c0719e5a SR	242	extern void ftrace_disable_daemon(void);
c0719e5a SR	243	extern void ftrace_enable_daemon(void);
e1c08bdd	244	#else
4dbf6bc2 SR	245	static inline int skip_trace(unsigned long ip) { return 0; }
	246	static inline int ftrace_force_update(void) { return 0; }
	247	static inline void ftrace_set_filter(unsigned char *buf, int len, int reset)
	248	{
	249	}
	250	static inline void ftrace_disable_daemon(void) { }
	251	static inline void ftrace_enable_daemon(void) { }
e7247a15	252	static inline void ftrace_release_mod(struct module *mod) {}
f6180773 SR	253	static inline int register_ftrace_command(struct ftrace_func_command *cmd)
f6180773 SR	254	{
97d0bb8d	255	return -EINVAL;
f6180773 SR	256	}
	257	static inline int unregister_ftrace_command(char *cmd_name)
	258	{
97d0bb8d	259	return -EINVAL;
f6180773	260	}
2cfa1978 MH	261	static inline int ftrace_text_reserved(void start, void end)
	262	{
	263	return 0;
	264	}
ecea656d	265	#endif /* CONFIG_DYNAMIC_FTRACE */
352ad25a	266
aeaee8a2 IM	267	/* totally disable ftrace - can not re-enable after this */
	268	void ftrace_kill(void);
	269
f43fdad8 IM	270	static inline void tracer_disable(void)
f43fdad8 IM	271	{
606576ce	272	#ifdef CONFIG_FUNCTION_TRACER
f43fdad8 IM	273	ftrace_enabled = 0;
	274	#endif
	275	}
	276
37002735 HY	277	/*
37002735 HY	278	* Ftrace disable/restore without lock. Some synchronization mechanism
9bdeb7b5	279	* must be used to prevent ftrace_enabled to be changed between
37002735 HY	280	* disable/restore.
37002735 HY	281	*/
9bdeb7b5 HY	282	static inline int __ftrace_enabled_save(void)
9bdeb7b5 HY	283	{
606576ce	284	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	285	int saved_ftrace_enabled = ftrace_enabled;
	286	ftrace_enabled = 0;
	287	return saved_ftrace_enabled;
	288	#else
	289	return 0;
	290	#endif
	291	}
	292
	293	static inline void __ftrace_enabled_restore(int enabled)
	294	{
606576ce	295	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	296	ftrace_enabled = enabled;
	297	#endif
	298	}
	299
c79a61f5 UKK	300	#ifndef HAVE_ARCH_CALLER_ADDR
	301	# ifdef CONFIG_FRAME_POINTER
	302	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	303	# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
	304	# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
	305	# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
	306	# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
	307	# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
	308	# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
	309	# else
	310	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	311	# define CALLER_ADDR1 0UL
	312	# define CALLER_ADDR2 0UL
	313	# define CALLER_ADDR3 0UL
	314	# define CALLER_ADDR4 0UL
	315	# define CALLER_ADDR5 0UL
	316	# define CALLER_ADDR6 0UL
	317	# endif
	318	#endif /* ifndef HAVE_ARCH_CALLER_ADDR */
352ad25a	319
81d68a96	320	#ifdef CONFIG_IRQSOFF_TRACER
489f1396 IM	321	extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
489f1396 IM	322	extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
81d68a96	323	#else
4dbf6bc2 SR	324	static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
4dbf6bc2 SR	325	static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
81d68a96 SR	326	#endif
81d68a96 SR	327
6cd8a4bb	328	#ifdef CONFIG_PREEMPT_TRACER
489f1396 IM	329	extern void trace_preempt_on(unsigned long a0, unsigned long a1);
489f1396 IM	330	extern void trace_preempt_off(unsigned long a0, unsigned long a1);
6cd8a4bb	331	#else
4dbf6bc2 SR	332	static inline void trace_preempt_on(unsigned long a0, unsigned long a1) { }
4dbf6bc2 SR	333	static inline void trace_preempt_off(unsigned long a0, unsigned long a1) { }
6cd8a4bb SR	334	#endif
6cd8a4bb SR	335
68bf21aa SR	336	#ifdef CONFIG_FTRACE_MCOUNT_RECORD
	337	extern void ftrace_init(void);
	338	#else
	339	static inline void ftrace_init(void) { }
	340	#endif
	341
287b6e68 FW	342	/*
	343	* Structure that defines an entry function trace.
	344	*/
	345	struct ftrace_graph_ent {
	346	unsigned long func; /* Current function */
	347	int depth;
	348	};
dd0e545f	349
caf4b323 FW	350	/*
	351	* Structure that defines a return function trace.
	352	*/
fb52607a	353	struct ftrace_graph_ret {
caf4b323 FW	354	unsigned long func; /* Current function */
	355	unsigned long long calltime;
	356	unsigned long long rettime;
0231022c FW	357	/* Number of functions that overran the depth limit for current task */
0231022c FW	358	unsigned long overrun;
287b6e68	359	int depth;
caf4b323 FW	360	};
caf4b323 FW	361
62b915f1 JO	362	/* Type of the callback handlers for tracing function graph*/
	363	typedef void (trace_func_graph_ret_t)(struct ftrace_graph_ret ); /* return */
	364	typedef int (trace_func_graph_ent_t)(struct ftrace_graph_ent ); /* entry */
	365
fb52607a	366	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
8b96f011	367
5ac9f622	368	/* for init task */
f876d346	369	#define INIT_FTRACE_GRAPH .ret_stack = NULL,
5ac9f622	370
712406a6 SR	371	/*
	372	* Stack of return addresses for functions
	373	* of a thread.
	374	* Used in struct thread_info
	375	*/
	376	struct ftrace_ret_stack {
	377	unsigned long ret;
	378	unsigned long func;
	379	unsigned long long calltime;
a2a16d6a	380	unsigned long long subtime;
71e308a2	381	unsigned long fp;
712406a6 SR	382	};
	383
	384	/*
	385	* Primary handler of a function return.
	386	* It relays on ftrace_return_to_handler.
	387	* Defined in entry_32/64.S
	388	*/
	389	extern void return_to_handler(void);
	390
	391	extern int
71e308a2 SR	392	ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
71e308a2 SR	393	unsigned long frame_pointer);
712406a6	394
8b96f011 FW	395	/*
	396	* Sometimes we don't want to trace a function with the function
	397	* graph tracer but we want them to keep traced by the usual function
	398	* tracer if the function graph tracer is not configured.
	399	*/
	400	#define __notrace_funcgraph notrace
	401
bcbc4f20 FW	402	/*
	403	* We want to which function is an entrypoint of a hardirq.
	404	* That will help us to put a signal on output.
	405	*/
	406	#define __irq_entry __attribute__((__section__(".irqentry.text")))
	407
	408	/* Limits of hardirq entrypoints */
	409	extern char __irqentry_text_start[];
	410	extern char __irqentry_text_end[];
	411
f201ae23 FW	412	#define FTRACE_RETFUNC_DEPTH 50
f201ae23 FW	413	#define FTRACE_RETSTACK_ALLOC_SIZE 32
287b6e68 FW	414	extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
	415	trace_func_graph_ent_t entryfunc);
	416
14a866c5 SR	417	extern void ftrace_graph_stop(void);
14a866c5 SR	418
287b6e68 FW	419	/* The current handlers in use */
	420	extern trace_func_graph_ret_t ftrace_graph_return;
	421	extern trace_func_graph_ent_t ftrace_graph_entry;
caf4b323	422
fb52607a	423	extern void unregister_ftrace_graph(void);
f201ae23	424
fb52607a FW	425	extern void ftrace_graph_init_task(struct task_struct *t);
fb52607a FW	426	extern void ftrace_graph_exit_task(struct task_struct *t);
868baf07	427	extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
21a8c466 FW	428
	429	static inline int task_curr_ret_stack(struct task_struct *t)
	430	{
	431	return t->curr_ret_stack;
	432	}
380c4b14 FW	433
	434	static inline void pause_graph_tracing(void)
	435	{
	436	atomic_inc(&current->tracing_graph_pause);
	437	}
	438
	439	static inline void unpause_graph_tracing(void)
	440	{
	441	atomic_dec(&current->tracing_graph_pause);
	442	}
5ac9f622	443	#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
8b96f011 FW	444
8b96f011 FW	445	#define __notrace_funcgraph
bcbc4f20	446	#define __irq_entry
5ac9f622	447	#define INIT_FTRACE_GRAPH
8b96f011	448
fb52607a FW	449	static inline void ftrace_graph_init_task(struct task_struct *t) { }
fb52607a FW	450	static inline void ftrace_graph_exit_task(struct task_struct *t) { }
868baf07	451	static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
21a8c466	452
62b915f1 JO	453	static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
	454	trace_func_graph_ent_t entryfunc)
	455	{
	456	return -1;
	457	}
	458	static inline void unregister_ftrace_graph(void) { }
	459
21a8c466 FW	460	static inline int task_curr_ret_stack(struct task_struct *tsk)
	461	{
	462	return -1;
	463	}
380c4b14 FW	464
	465	static inline void pause_graph_tracing(void) { }
	466	static inline void unpause_graph_tracing(void) { }
5ac9f622	467	#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
caf4b323	468
ea4e2bc4	469	#ifdef CONFIG_TRACING
ea4e2bc4 SR	470
	471	/* flags for current->trace */
	472	enum {
	473	TSK_TRACE_FL_TRACE_BIT = 0,
	474	TSK_TRACE_FL_GRAPH_BIT = 1,
	475	};
	476	enum {
	477	TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
	478	TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
	479	};
	480
	481	static inline void set_tsk_trace_trace(struct task_struct *tsk)
	482	{
	483	set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	484	}
	485
	486	static inline void clear_tsk_trace_trace(struct task_struct *tsk)
	487	{
	488	clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	489	}
	490
	491	static inline int test_tsk_trace_trace(struct task_struct *tsk)
	492	{
	493	return tsk->trace & TSK_TRACE_FL_TRACE;
	494	}
	495
	496	static inline void set_tsk_trace_graph(struct task_struct *tsk)
	497	{
	498	set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	499	}
	500
	501	static inline void clear_tsk_trace_graph(struct task_struct *tsk)
	502	{
	503	clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	504	}
	505
	506	static inline int test_tsk_trace_graph(struct task_struct *tsk)
	507	{
	508	return tsk->trace & TSK_TRACE_FL_GRAPH;
	509	}
	510
cecbca96 FW	511	enum ftrace_dump_mode;
	512
	513	extern enum ftrace_dump_mode ftrace_dump_on_oops;
526211bc	514
261842b7 SR	515	#ifdef CONFIG_PREEMPT
	516	#define INIT_TRACE_RECURSION .trace_recursion = 0,
	517	#endif
	518
ea4e2bc4 SR	519	#endif /* CONFIG_TRACING */
ea4e2bc4 SR	520
261842b7 SR	521	#ifndef INIT_TRACE_RECURSION
	522	#define INIT_TRACE_RECURSION
	523	#endif
b1818748	524
e7b8e675 MF	525	#ifdef CONFIG_FTRACE_SYSCALLS
	526
	527	unsigned long arch_syscall_addr(int nr);
	528
	529	#endif /* CONFIG_FTRACE_SYSCALLS */
	530
16444a8a	531	#endif /* _LINUX_FTRACE_H */