[deliverable/linux.git] / include / linux / ftrace.h

#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_FAILED	= (1 << 1),
	FTRACE_FL_FILTER	= (1 << 2),
	FTRACE_FL_ENABLED	= (1 << 3),
	FTRACE_FL_NOTRACE	= (1 << 4),
	FTRACE_FL_CONVERTED	= (1 << 5),
};

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);

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 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
16444a8a ACM	1	#ifndef _LINUX_FTRACE_H
	2	#define _LINUX_FTRACE_H
	3
0012693a	4	#include <linux/trace_clock.h>
5601020f	5	#include <linux/kallsyms.h>
0012693a	6	#include <linux/linkage.h>
ea4e2bc4	7	#include <linux/bitops.h>
0012693a FW	8	#include <linux/module.h>
0012693a FW	9	#include <linux/ktime.h>
21a8c466	10	#include <linux/sched.h>
0012693a FW	11	#include <linux/types.h>
	12	#include <linux/init.h>
	13	#include <linux/fs.h>
16444a8a	14
c79a61f5 UKK	15	#include <asm/ftrace.h>
c79a61f5 UKK	16
606576ce	17	#ifdef CONFIG_FUNCTION_TRACER
3e1932ad	18
b0fc494f SR	19	extern int ftrace_enabled;
	20	extern int
	21	ftrace_enable_sysctl(struct ctl_table *table, int write,
8d65af78	22	void __user buffer, size_t lenp,
b0fc494f SR	23	loff_t *ppos);
b0fc494f SR	24
16444a8a ACM	25	typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
	26
	27	struct ftrace_ops {
	28	ftrace_func_t func;
	29	struct ftrace_ops *next;
	30	};
	31
60a7ecf4 SR	32	extern int function_trace_stop;
60a7ecf4 SR	33
e7d3737e FW	34	/*
	35	* Type of the current tracing.
	36	*/
	37	enum ftrace_tracing_type_t {
	38	FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
	39	FTRACE_TYPE_RETURN, /* Hook the return of the function */
	40	};
	41
	42	/* Current tracing type, default is FTRACE_TYPE_ENTER */
	43	extern enum ftrace_tracing_type_t ftrace_tracing_type;
	44
60a7ecf4 SR	45	/**
	46	* ftrace_stop - stop function tracer.
	47	*
	48	* A quick way to stop the function tracer. Note this an on off switch,
	49	* it is not something that is recursive like preempt_disable.
	50	* This does not disable the calling of mcount, it only stops the
	51	* calling of functions from mcount.
	52	*/
	53	static inline void ftrace_stop(void)
	54	{
	55	function_trace_stop = 1;
	56	}
	57
	58	/**
	59	* ftrace_start - start the function tracer.
	60	*
	61	* This function is the inverse of ftrace_stop. This does not enable
	62	* the function tracing if the function tracer is disabled. This only
	63	* sets the function tracer flag to continue calling the functions
	64	* from mcount.
	65	*/
	66	static inline void ftrace_start(void)
	67	{
	68	function_trace_stop = 0;
	69	}
	70
16444a8a ACM	71	/*
	72	* The ftrace_ops must be a static and should also
	73	* be read_mostly. These functions do modify read_mostly variables
	74	* so use them sparely. Never free an ftrace_op or modify the
	75	* next pointer after it has been registered. Even after unregistering
	76	* it, the next pointer may still be used internally.
	77	*/
	78	int register_ftrace_function(struct ftrace_ops *ops);
	79	int unregister_ftrace_function(struct ftrace_ops *ops);
	80	void clear_ftrace_function(void);
	81
	82	extern void ftrace_stub(unsigned long a0, unsigned long a1);
16444a8a	83
606576ce	84	#else /* !CONFIG_FUNCTION_TRACER */
4dbf6bc2 SR	85	/*
	86	* (un)register_ftrace_function must be a macro since the ops parameter
	87	* must not be evaluated.
	88	*/
	89	#define register_ftrace_function(ops) ({ 0; })
	90	#define unregister_ftrace_function(ops) ({ 0; })
	91	static inline void clear_ftrace_function(void) { }
81adbdc0	92	static inline void ftrace_kill(void) { }
60a7ecf4 SR	93	static inline void ftrace_stop(void) { }
60a7ecf4 SR	94	static inline void ftrace_start(void) { }
606576ce	95	#endif /* CONFIG_FUNCTION_TRACER */
352ad25a	96
f38f1d2a SR	97	#ifdef CONFIG_STACK_TRACER
	98	extern int stack_tracer_enabled;
	99	int
	100	stack_trace_sysctl(struct ctl_table *table, int write,
8d65af78	101	void __user buffer, size_t lenp,
f38f1d2a SR	102	loff_t *ppos);
	103	#endif
	104
f6180773 SR	105	struct ftrace_func_command {
	106	struct list_head list;
	107	char *name;
	108	int (func)(char func, char *cmd,
	109	char *params, int enable);
	110	};
	111
3d083395	112	#ifdef CONFIG_DYNAMIC_FTRACE
31e88909	113
000ab691 SR	114	int ftrace_arch_code_modify_prepare(void);
	115	int ftrace_arch_code_modify_post_process(void);
	116
809dcf29 SR	117	struct seq_file;
809dcf29 SR	118
b6887d79	119	struct ftrace_probe_ops {
59df055f SR	120	void (*func)(unsigned long ip,
	121	unsigned long parent_ip,
	122	void **data);
	123	int (callback)(unsigned long ip, void *data);
	124	void (free)(void *data);
809dcf29 SR	125	int (print)(struct seq_file m,
809dcf29 SR	126	unsigned long ip,
b6887d79	127	struct ftrace_probe_ops *ops,
809dcf29	128	void *data);
59df055f SR	129	};
	130
	131	extern int
b6887d79	132	register_ftrace_function_probe(char glob, struct ftrace_probe_ops ops,
59df055f SR	133	void *data);
59df055f SR	134	extern void
b6887d79	135	unregister_ftrace_function_probe(char glob, struct ftrace_probe_ops ops,
59df055f SR	136	void *data);
59df055f SR	137	extern void
b6887d79 SR	138	unregister_ftrace_function_probe_func(char glob, struct ftrace_probe_ops ops);
b6887d79 SR	139	extern void unregister_ftrace_function_probe_all(char *glob);
59df055f	140
2cfa1978 MH	141	extern int ftrace_text_reserved(void start, void end);
2cfa1978 MH	142
3c1720f0	143	enum {
37ad5084 SR	144	FTRACE_FL_FREE = (1 << 0),
	145	FTRACE_FL_FAILED = (1 << 1),
	146	FTRACE_FL_FILTER = (1 << 2),
	147	FTRACE_FL_ENABLED = (1 << 3),
41c52c0d	148	FTRACE_FL_NOTRACE = (1 << 4),
0eb96701	149	FTRACE_FL_CONVERTED = (1 << 5),
3c1720f0 SR	150	};
3c1720f0 SR	151
3d083395	152	struct dyn_ftrace {
ee000b7f LJ	153	union {
	154	unsigned long ip; /* address of mcount call-site */
	155	struct dyn_ftrace *freelist;
	156	};
	157	union {
	158	unsigned long flags;
	159	struct dyn_ftrace *newlist;
	160	};
	161	struct dyn_arch_ftrace arch;
3d083395 SR	162	};
3d083395 SR	163
e1c08bdd	164	int ftrace_force_update(void);
77a2b37d	165	void ftrace_set_filter(unsigned char *buf, int len, int reset);
e1c08bdd	166
f6180773 SR	167	int register_ftrace_command(struct ftrace_func_command *cmd);
	168	int unregister_ftrace_command(struct ftrace_func_command *cmd);
	169
3d083395	170	/* defined in arch */
3c1720f0	171	extern int ftrace_ip_converted(unsigned long ip);
d61f82d0	172	extern int ftrace_dyn_arch_init(void *data);
d61f82d0 SR	173	extern int ftrace_update_ftrace_func(ftrace_func_t func);
	174	extern void ftrace_caller(void);
	175	extern void ftrace_call(void);
	176	extern void mcount_call(void);
f0001207 SL	177
	178	#ifndef FTRACE_ADDR
	179	#define FTRACE_ADDR ((unsigned long)ftrace_caller)
	180	#endif
fb52607a FW	181	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
fb52607a FW	182	extern void ftrace_graph_caller(void);
5a45cfe1 SR	183	extern int ftrace_enable_ftrace_graph_caller(void);
	184	extern int ftrace_disable_ftrace_graph_caller(void);
	185	#else
	186	static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
	187	static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
e7d3737e	188	#endif
ad90c0e3	189
31e88909	190	/**
57794a9d	191	* ftrace_make_nop - convert code into nop
31e88909 SR	192	* @mod: module structure if called by module load initialization
	193	* @rec: the mcount call site record
	194	* @addr: the address that the call site should be calling
	195	*
	196	* This is a very sensitive operation and great care needs
	197	* to be taken by the arch. The operation should carefully
	198	* read the location, check to see if what is read is indeed
	199	* what we expect it to be, and then on success of the compare,
	200	* it should write to the location.
	201	*
	202	* The code segment at @rec->ip should be a caller to @addr
	203	*
	204	* Return must be:
	205	* 0 on success
	206	* -EFAULT on error reading the location
	207	* -EINVAL on a failed compare of the contents
	208	* -EPERM on error writing to the location
	209	* Any other value will be considered a failure.
	210	*/
	211	extern int ftrace_make_nop(struct module *mod,
	212	struct dyn_ftrace *rec, unsigned long addr);
a26a2a27	213
593eb8a2	214	/**
31e88909 SR	215	* ftrace_make_call - convert a nop call site into a call to addr
	216	* @rec: the mcount call site record
	217	* @addr: the address that the call site should call
593eb8a2 SR	218	*
	219	* This is a very sensitive operation and great care needs
	220	* to be taken by the arch. The operation should carefully
	221	* read the location, check to see if what is read is indeed
	222	* what we expect it to be, and then on success of the compare,
	223	* it should write to the location.
	224	*
31e88909 SR	225	* The code segment at @rec->ip should be a nop
31e88909 SR	226	*
593eb8a2 SR	227	* Return must be:
	228	* 0 on success
	229	* -EFAULT on error reading the location
	230	* -EINVAL on a failed compare of the contents
	231	* -EPERM on error writing to the location
	232	* Any other value will be considered a failure.
	233	*/
31e88909 SR	234	extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
31e88909 SR	235
31e88909 SR	236	/* May be defined in arch */
31e88909 SR	237	extern int ftrace_arch_read_dyn_info(char *buf, int size);
593eb8a2	238
ecea656d AS	239	extern int skip_trace(unsigned long ip);
ecea656d AS	240
c0719e5a SR	241	extern void ftrace_disable_daemon(void);
c0719e5a SR	242	extern void ftrace_enable_daemon(void);
e1c08bdd	243	#else
4dbf6bc2 SR	244	static inline int skip_trace(unsigned long ip) { return 0; }
	245	static inline int ftrace_force_update(void) { return 0; }
	246	static inline void ftrace_set_filter(unsigned char *buf, int len, int reset)
	247	{
	248	}
	249	static inline void ftrace_disable_daemon(void) { }
	250	static inline void ftrace_enable_daemon(void) { }
e7247a15	251	static inline void ftrace_release_mod(struct module *mod) {}
f6180773 SR	252	static inline int register_ftrace_command(struct ftrace_func_command *cmd)
f6180773 SR	253	{
97d0bb8d	254	return -EINVAL;
f6180773 SR	255	}
	256	static inline int unregister_ftrace_command(char *cmd_name)
	257	{
97d0bb8d	258	return -EINVAL;
f6180773	259	}
2cfa1978 MH	260	static inline int ftrace_text_reserved(void start, void end)
	261	{
	262	return 0;
	263	}
ecea656d	264	#endif /* CONFIG_DYNAMIC_FTRACE */
352ad25a	265
aeaee8a2 IM	266	/* totally disable ftrace - can not re-enable after this */
	267	void ftrace_kill(void);
	268
f43fdad8 IM	269	static inline void tracer_disable(void)
f43fdad8 IM	270	{
606576ce	271	#ifdef CONFIG_FUNCTION_TRACER
f43fdad8 IM	272	ftrace_enabled = 0;
	273	#endif
	274	}
	275
37002735 HY	276	/*
37002735 HY	277	* Ftrace disable/restore without lock. Some synchronization mechanism
9bdeb7b5	278	* must be used to prevent ftrace_enabled to be changed between
37002735 HY	279	* disable/restore.
37002735 HY	280	*/
9bdeb7b5 HY	281	static inline int __ftrace_enabled_save(void)
9bdeb7b5 HY	282	{
606576ce	283	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	284	int saved_ftrace_enabled = ftrace_enabled;
	285	ftrace_enabled = 0;
	286	return saved_ftrace_enabled;
	287	#else
	288	return 0;
	289	#endif
	290	}
	291
	292	static inline void __ftrace_enabled_restore(int enabled)
	293	{
606576ce	294	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	295	ftrace_enabled = enabled;
	296	#endif
	297	}
	298
c79a61f5 UKK	299	#ifndef HAVE_ARCH_CALLER_ADDR
	300	# ifdef CONFIG_FRAME_POINTER
	301	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	302	# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
	303	# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
	304	# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
	305	# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
	306	# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
	307	# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
	308	# else
	309	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	310	# define CALLER_ADDR1 0UL
	311	# define CALLER_ADDR2 0UL
	312	# define CALLER_ADDR3 0UL
	313	# define CALLER_ADDR4 0UL
	314	# define CALLER_ADDR5 0UL
	315	# define CALLER_ADDR6 0UL
	316	# endif
	317	#endif /* ifndef HAVE_ARCH_CALLER_ADDR */
352ad25a	318
81d68a96	319	#ifdef CONFIG_IRQSOFF_TRACER
489f1396 IM	320	extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
489f1396 IM	321	extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
81d68a96	322	#else
4dbf6bc2 SR	323	static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
4dbf6bc2 SR	324	static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
81d68a96 SR	325	#endif
81d68a96 SR	326
6cd8a4bb	327	#ifdef CONFIG_PREEMPT_TRACER
489f1396 IM	328	extern void trace_preempt_on(unsigned long a0, unsigned long a1);
489f1396 IM	329	extern void trace_preempt_off(unsigned long a0, unsigned long a1);
6cd8a4bb	330	#else
4dbf6bc2 SR	331	static inline void trace_preempt_on(unsigned long a0, unsigned long a1) { }
4dbf6bc2 SR	332	static inline void trace_preempt_off(unsigned long a0, unsigned long a1) { }
6cd8a4bb SR	333	#endif
6cd8a4bb SR	334
68bf21aa SR	335	#ifdef CONFIG_FTRACE_MCOUNT_RECORD
	336	extern void ftrace_init(void);
	337	#else
	338	static inline void ftrace_init(void) { }
	339	#endif
	340
287b6e68 FW	341	/*
	342	* Structure that defines an entry function trace.
	343	*/
	344	struct ftrace_graph_ent {
	345	unsigned long func; /* Current function */
	346	int depth;
	347	};
dd0e545f	348
caf4b323 FW	349	/*
	350	* Structure that defines a return function trace.
	351	*/
fb52607a	352	struct ftrace_graph_ret {
caf4b323 FW	353	unsigned long func; /* Current function */
	354	unsigned long long calltime;
	355	unsigned long long rettime;
0231022c FW	356	/* Number of functions that overran the depth limit for current task */
0231022c FW	357	unsigned long overrun;
287b6e68	358	int depth;
caf4b323 FW	359	};
caf4b323 FW	360
62b915f1 JO	361	/* Type of the callback handlers for tracing function graph*/
	362	typedef void (trace_func_graph_ret_t)(struct ftrace_graph_ret ); /* return */
	363	typedef int (trace_func_graph_ent_t)(struct ftrace_graph_ent ); /* entry */
	364
fb52607a	365	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
8b96f011	366
5ac9f622	367	/* for init task */
f876d346	368	#define INIT_FTRACE_GRAPH .ret_stack = NULL,
5ac9f622	369
712406a6 SR	370	/*
	371	* Stack of return addresses for functions
	372	* of a thread.
	373	* Used in struct thread_info
	374	*/
	375	struct ftrace_ret_stack {
	376	unsigned long ret;
	377	unsigned long func;
	378	unsigned long long calltime;
a2a16d6a	379	unsigned long long subtime;
71e308a2	380	unsigned long fp;
712406a6 SR	381	};
	382
	383	/*
	384	* Primary handler of a function return.
	385	* It relays on ftrace_return_to_handler.
	386	* Defined in entry_32/64.S
	387	*/
	388	extern void return_to_handler(void);
	389
	390	extern int
71e308a2 SR	391	ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
71e308a2 SR	392	unsigned long frame_pointer);
712406a6	393
8b96f011 FW	394	/*
	395	* Sometimes we don't want to trace a function with the function
	396	* graph tracer but we want them to keep traced by the usual function
	397	* tracer if the function graph tracer is not configured.
	398	*/
	399	#define __notrace_funcgraph notrace
	400
bcbc4f20 FW	401	/*
	402	* We want to which function is an entrypoint of a hardirq.
	403	* That will help us to put a signal on output.
	404	*/
	405	#define __irq_entry __attribute__((__section__(".irqentry.text")))
	406
	407	/* Limits of hardirq entrypoints */
	408	extern char __irqentry_text_start[];
	409	extern char __irqentry_text_end[];
	410
f201ae23 FW	411	#define FTRACE_RETFUNC_DEPTH 50
f201ae23 FW	412	#define FTRACE_RETSTACK_ALLOC_SIZE 32
287b6e68 FW	413	extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
	414	trace_func_graph_ent_t entryfunc);
	415
14a866c5 SR	416	extern void ftrace_graph_stop(void);
14a866c5 SR	417
287b6e68 FW	418	/* The current handlers in use */
	419	extern trace_func_graph_ret_t ftrace_graph_return;
	420	extern trace_func_graph_ent_t ftrace_graph_entry;
caf4b323	421
fb52607a	422	extern void unregister_ftrace_graph(void);
f201ae23	423
fb52607a FW	424	extern void ftrace_graph_init_task(struct task_struct *t);
fb52607a FW	425	extern void ftrace_graph_exit_task(struct task_struct *t);
21a8c466 FW	426
	427	static inline int task_curr_ret_stack(struct task_struct *t)
	428	{
	429	return t->curr_ret_stack;
	430	}
380c4b14 FW	431
	432	static inline void pause_graph_tracing(void)
	433	{
	434	atomic_inc(&current->tracing_graph_pause);
	435	}
	436
	437	static inline void unpause_graph_tracing(void)
	438	{
	439	atomic_dec(&current->tracing_graph_pause);
	440	}
5ac9f622	441	#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
8b96f011 FW	442
8b96f011 FW	443	#define __notrace_funcgraph
bcbc4f20	444	#define __irq_entry
5ac9f622	445	#define INIT_FTRACE_GRAPH
8b96f011	446
fb52607a FW	447	static inline void ftrace_graph_init_task(struct task_struct *t) { }
fb52607a FW	448	static inline void ftrace_graph_exit_task(struct task_struct *t) { }
21a8c466	449
62b915f1 JO	450	static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
	451	trace_func_graph_ent_t entryfunc)
	452	{
	453	return -1;
	454	}
	455	static inline void unregister_ftrace_graph(void) { }
	456
21a8c466 FW	457	static inline int task_curr_ret_stack(struct task_struct *tsk)
	458	{
	459	return -1;
	460	}
380c4b14 FW	461
	462	static inline void pause_graph_tracing(void) { }
	463	static inline void unpause_graph_tracing(void) { }
5ac9f622	464	#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
caf4b323	465
ea4e2bc4	466	#ifdef CONFIG_TRACING
ea4e2bc4 SR	467
	468	/* flags for current->trace */
	469	enum {
	470	TSK_TRACE_FL_TRACE_BIT = 0,
	471	TSK_TRACE_FL_GRAPH_BIT = 1,
	472	};
	473	enum {
	474	TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
	475	TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
	476	};
	477
	478	static inline void set_tsk_trace_trace(struct task_struct *tsk)
	479	{
	480	set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	481	}
	482
	483	static inline void clear_tsk_trace_trace(struct task_struct *tsk)
	484	{
	485	clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	486	}
	487
	488	static inline int test_tsk_trace_trace(struct task_struct *tsk)
	489	{
	490	return tsk->trace & TSK_TRACE_FL_TRACE;
	491	}
	492
	493	static inline void set_tsk_trace_graph(struct task_struct *tsk)
	494	{
	495	set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	496	}
	497
	498	static inline void clear_tsk_trace_graph(struct task_struct *tsk)
	499	{
	500	clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	501	}
	502
	503	static inline int test_tsk_trace_graph(struct task_struct *tsk)
	504	{
	505	return tsk->trace & TSK_TRACE_FL_GRAPH;
	506	}
	507
cecbca96 FW	508	enum ftrace_dump_mode;
	509
	510	extern enum ftrace_dump_mode ftrace_dump_on_oops;
526211bc	511
261842b7 SR	512	#ifdef CONFIG_PREEMPT
	513	#define INIT_TRACE_RECURSION .trace_recursion = 0,
	514	#endif
	515
ea4e2bc4 SR	516	#endif /* CONFIG_TRACING */
ea4e2bc4 SR	517
261842b7 SR	518	#ifndef INIT_TRACE_RECURSION
	519	#define INIT_TRACE_RECURSION
	520	#endif
b1818748	521
e7b8e675 MF	522	#ifdef CONFIG_FTRACE_SYSCALLS
	523
	524	unsigned long arch_syscall_addr(int nr);
	525
	526	#endif /* CONFIG_FTRACE_SYSCALLS */
	527
16444a8a	528	#endif /* _LINUX_FTRACE_H */