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

#ifndef _LINUX_FTRACE_H
#define _LINUX_FTRACE_H

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

#ifdef CONFIG_FUNCTION_TRACER

extern int ftrace_enabled;
extern int
ftrace_enable_sysctl(struct ctl_table *table, int write,
		     struct file *filp, 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 */
# define register_ftrace_function(ops) do { } while (0)
# define unregister_ftrace_function(ops) do { } while (0)
# define clear_ftrace_function(ops) do { } while (0)
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,
		   struct file *file, 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
/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
#include <asm/ftrace.h>

struct seq_file;

struct ftrace_hook_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_hook_ops *ops,
					 void *data);
};

extern int
register_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops,
			      void *data);
extern void
unregister_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops,
				void *data);
extern void
unregister_ftrace_function_hook_func(char *glob, struct ftrace_hook_ops *ops);
extern void unregister_ftrace_function_hook_all(char *glob);

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),
	FTRACE_FL_FROZEN	= (1 << 6),
};

struct dyn_ftrace {
	struct list_head	list;
	unsigned long		ip; /* address of mcount call-site */
	unsigned long		flags;
	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_release(void *start, unsigned long size);

extern void ftrace_disable_daemon(void);
extern void ftrace_enable_daemon(void);
#else
# define skip_trace(ip)				({ 0; })
# define ftrace_force_update()			({ 0; })
# define ftrace_set_filter(buf, len, reset)	do { } while (0)
# define ftrace_disable_daemon()		do { } while (0)
# define ftrace_enable_daemon()			do { } while (0)
static inline void ftrace_release(void *start, unsigned long size) { }
static inline int register_ftrace_command(struct ftrace_func_command *cmd)
{
	return -EINVAL;
}
static inline int unregister_ftrace_command(char *cmd_name)
{
	return -EINVAL;
}
#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
}

#ifdef CONFIG_FRAME_POINTER
/* TODO: need to fix this for ARM */
# 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

#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
# define time_hardirqs_on(a0, a1)		do { } while (0)
# define time_hardirqs_off(a0, a1)		do { } while (0)
#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
# define trace_preempt_on(a0, a1)		do { } while (0)
# define trace_preempt_off(a0, a1)		do { } while (0)
#endif

#ifdef CONFIG_TRACING
extern int ftrace_dump_on_oops;

extern void tracing_start(void);
extern void tracing_stop(void);
extern void ftrace_off_permanent(void);

extern void
ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);

/**
 * ftrace_printk - printf formatting in the ftrace buffer
 * @fmt: the printf format for printing
 *
 * Note: __ftrace_printk is an internal function for ftrace_printk and
 *       the @ip is passed in via the ftrace_printk macro.
 *
 * This function allows a kernel developer to debug fast path sections
 * that printk is not appropriate for. By scattering in various
 * printk like tracing in the code, a developer can quickly see
 * where problems are occurring.
 *
 * This is intended as a debugging tool for the developer only.
 * Please refrain from leaving ftrace_printks scattered around in
 * your code.
 */
# define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt)
extern int
__ftrace_printk(unsigned long ip, const char *fmt, ...)
	__attribute__ ((format (printf, 2, 3)));
# define ftrace_vprintk(fmt, ap) __ftrace_printk(_THIS_IP_, fmt, ap)
extern int
__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
extern void ftrace_dump(void);
#else
static inline void
ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
static inline int
ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));

static inline void tracing_start(void) { }
static inline void tracing_stop(void) { }
static inline void ftrace_off_permanent(void) { }
static inline int
ftrace_printk(const char *fmt, ...)
{
	return 0;
}
static inline int
ftrace_vprintk(const char *fmt, va_list ap)
{
	return 0;
}
static inline void ftrace_dump(void) { }
#endif

#ifdef CONFIG_FTRACE_MCOUNT_RECORD
extern void ftrace_init(void);
extern void ftrace_init_module(struct module *mod,
			       unsigned long *start, unsigned long *end);
#else
static inline void ftrace_init(void) { }
static inline void
ftrace_init_module(struct module *mod,
		   unsigned long *start, unsigned long *end) { }
#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;
};

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

/*
 * 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
/* 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 */

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

#define __notrace_funcgraph
#define __irq_entry

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 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

#ifdef CONFIG_TRACING
#include <linux/sched.h>

/* 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;
}

#endif /* CONFIG_TRACING */


#ifdef CONFIG_HW_BRANCH_TRACER

void trace_hw_branch(u64 from, u64 to);
void trace_hw_branch_oops(void);

#else /* CONFIG_HW_BRANCH_TRACER */

static inline void trace_hw_branch(u64 from, u64 to) {}
static inline void trace_hw_branch_oops(void) {}

#endif /* CONFIG_HW_BRANCH_TRACER */

#endif /* _LINUX_FTRACE_H */
Commit	Line	Data
16444a8a ACM	1	#ifndef _LINUX_FTRACE_H
	2	#define _LINUX_FTRACE_H
	3
16444a8a	4	#include <linux/linkage.h>
d49dbf33	5	#include <linux/fs.h>
eb7fa935	6	#include <linux/ktime.h>
d13744cd FW	7	#include <linux/init.h>
d13744cd FW	8	#include <linux/types.h>
9c246247	9	#include <linux/module.h>
5601020f	10	#include <linux/kallsyms.h>
ea4e2bc4	11	#include <linux/bitops.h>
21a8c466	12	#include <linux/sched.h>
16444a8a	13
606576ce	14	#ifdef CONFIG_FUNCTION_TRACER
3e1932ad	15
b0fc494f SR	16	extern int ftrace_enabled;
	17	extern int
	18	ftrace_enable_sysctl(struct ctl_table *table, int write,
	19	struct file filp, void __user buffer, size_t *lenp,
	20	loff_t *ppos);
	21
16444a8a ACM	22	typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
	23
	24	struct ftrace_ops {
	25	ftrace_func_t func;
	26	struct ftrace_ops *next;
	27	};
	28
60a7ecf4 SR	29	extern int function_trace_stop;
60a7ecf4 SR	30
e7d3737e FW	31	/*
	32	* Type of the current tracing.
	33	*/
	34	enum ftrace_tracing_type_t {
	35	FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
	36	FTRACE_TYPE_RETURN, /* Hook the return of the function */
	37	};
	38
	39	/* Current tracing type, default is FTRACE_TYPE_ENTER */
	40	extern enum ftrace_tracing_type_t ftrace_tracing_type;
	41
60a7ecf4 SR	42	/**
	43	* ftrace_stop - stop function tracer.
	44	*
	45	* A quick way to stop the function tracer. Note this an on off switch,
	46	* it is not something that is recursive like preempt_disable.
	47	* This does not disable the calling of mcount, it only stops the
	48	* calling of functions from mcount.
	49	*/
	50	static inline void ftrace_stop(void)
	51	{
	52	function_trace_stop = 1;
	53	}
	54
	55	/**
	56	* ftrace_start - start the function tracer.
	57	*
	58	* This function is the inverse of ftrace_stop. This does not enable
	59	* the function tracing if the function tracer is disabled. This only
	60	* sets the function tracer flag to continue calling the functions
	61	* from mcount.
	62	*/
	63	static inline void ftrace_start(void)
	64	{
	65	function_trace_stop = 0;
	66	}
	67
16444a8a ACM	68	/*
	69	* The ftrace_ops must be a static and should also
	70	* be read_mostly. These functions do modify read_mostly variables
	71	* so use them sparely. Never free an ftrace_op or modify the
	72	* next pointer after it has been registered. Even after unregistering
	73	* it, the next pointer may still be used internally.
	74	*/
	75	int register_ftrace_function(struct ftrace_ops *ops);
	76	int unregister_ftrace_function(struct ftrace_ops *ops);
	77	void clear_ftrace_function(void);
	78
	79	extern void ftrace_stub(unsigned long a0, unsigned long a1);
16444a8a	80
606576ce	81	#else /* !CONFIG_FUNCTION_TRACER */
16444a8a ACM	82	# define register_ftrace_function(ops) do { } while (0)
	83	# define unregister_ftrace_function(ops) do { } while (0)
	84	# define clear_ftrace_function(ops) do { } while (0)
81adbdc0	85	static inline void ftrace_kill(void) { }
60a7ecf4 SR	86	static inline void ftrace_stop(void) { }
60a7ecf4 SR	87	static inline void ftrace_start(void) { }
606576ce	88	#endif /* CONFIG_FUNCTION_TRACER */
352ad25a	89
f38f1d2a SR	90	#ifdef CONFIG_STACK_TRACER
	91	extern int stack_tracer_enabled;
	92	int
	93	stack_trace_sysctl(struct ctl_table *table, int write,
	94	struct file file, void __user buffer, size_t *lenp,
	95	loff_t *ppos);
	96	#endif
	97
f6180773 SR	98	struct ftrace_func_command {
	99	struct list_head list;
	100	char *name;
	101	int (func)(char func, char *cmd,
	102	char *params, int enable);
	103	};
	104
3d083395	105	#ifdef CONFIG_DYNAMIC_FTRACE
31e88909 SR	106	/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
	107	#include <asm/ftrace.h>
	108
809dcf29 SR	109	struct seq_file;
809dcf29 SR	110
59df055f SR	111	struct ftrace_hook_ops {
	112	void (*func)(unsigned long ip,
	113	unsigned long parent_ip,
	114	void **data);
	115	int (callback)(unsigned long ip, void *data);
	116	void (free)(void *data);
809dcf29 SR	117	int (print)(struct seq_file m,
	118	unsigned long ip,
	119	struct ftrace_hook_ops *ops,
	120	void *data);
59df055f SR	121	};
	122
	123	extern int
	124	register_ftrace_function_hook(char glob, struct ftrace_hook_ops ops,
	125	void *data);
	126	extern void
	127	unregister_ftrace_function_hook(char glob, struct ftrace_hook_ops ops,
	128	void *data);
	129	extern void
	130	unregister_ftrace_function_hook_func(char glob, struct ftrace_hook_ops ops);
	131	extern void unregister_ftrace_function_hook_all(char *glob);
	132
3c1720f0	133	enum {
37ad5084 SR	134	FTRACE_FL_FREE = (1 << 0),
	135	FTRACE_FL_FAILED = (1 << 1),
	136	FTRACE_FL_FILTER = (1 << 2),
	137	FTRACE_FL_ENABLED = (1 << 3),
41c52c0d	138	FTRACE_FL_NOTRACE = (1 << 4),
0eb96701	139	FTRACE_FL_CONVERTED = (1 << 5),
ecea656d	140	FTRACE_FL_FROZEN = (1 << 6),
3c1720f0 SR	141	};
3c1720f0 SR	142
3d083395	143	struct dyn_ftrace {
08f5ac90 SR	144	struct list_head list;
	145	unsigned long ip; /* address of mcount call-site */
	146	unsigned long flags;
31e88909	147	struct dyn_arch_ftrace arch;
3d083395 SR	148	};
3d083395 SR	149
e1c08bdd	150	int ftrace_force_update(void);
77a2b37d	151	void ftrace_set_filter(unsigned char *buf, int len, int reset);
e1c08bdd	152
f6180773 SR	153	int register_ftrace_command(struct ftrace_func_command *cmd);
	154	int unregister_ftrace_command(struct ftrace_func_command *cmd);
	155
3d083395	156	/* defined in arch */
3c1720f0	157	extern int ftrace_ip_converted(unsigned long ip);
d61f82d0	158	extern int ftrace_dyn_arch_init(void *data);
d61f82d0 SR	159	extern int ftrace_update_ftrace_func(ftrace_func_t func);
	160	extern void ftrace_caller(void);
	161	extern void ftrace_call(void);
	162	extern void mcount_call(void);
f0001207 SL	163
	164	#ifndef FTRACE_ADDR
	165	#define FTRACE_ADDR ((unsigned long)ftrace_caller)
	166	#endif
fb52607a FW	167	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
fb52607a FW	168	extern void ftrace_graph_caller(void);
5a45cfe1 SR	169	extern int ftrace_enable_ftrace_graph_caller(void);
	170	extern int ftrace_disable_ftrace_graph_caller(void);
	171	#else
	172	static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
	173	static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
e7d3737e	174	#endif
ad90c0e3	175
31e88909	176	/**
57794a9d	177	* ftrace_make_nop - convert code into nop
31e88909 SR	178	* @mod: module structure if called by module load initialization
	179	* @rec: the mcount call site record
	180	* @addr: the address that the call site should be calling
	181	*
	182	* This is a very sensitive operation and great care needs
	183	* to be taken by the arch. The operation should carefully
	184	* read the location, check to see if what is read is indeed
	185	* what we expect it to be, and then on success of the compare,
	186	* it should write to the location.
	187	*
	188	* The code segment at @rec->ip should be a caller to @addr
	189	*
	190	* Return must be:
	191	* 0 on success
	192	* -EFAULT on error reading the location
	193	* -EINVAL on a failed compare of the contents
	194	* -EPERM on error writing to the location
	195	* Any other value will be considered a failure.
	196	*/
	197	extern int ftrace_make_nop(struct module *mod,
	198	struct dyn_ftrace *rec, unsigned long addr);
a26a2a27	199
593eb8a2	200	/**
31e88909 SR	201	* ftrace_make_call - convert a nop call site into a call to addr
	202	* @rec: the mcount call site record
	203	* @addr: the address that the call site should call
593eb8a2 SR	204	*
	205	* This is a very sensitive operation and great care needs
	206	* to be taken by the arch. The operation should carefully
	207	* read the location, check to see if what is read is indeed
	208	* what we expect it to be, and then on success of the compare,
	209	* it should write to the location.
	210	*
31e88909 SR	211	* The code segment at @rec->ip should be a nop
31e88909 SR	212	*
593eb8a2 SR	213	* Return must be:
	214	* 0 on success
	215	* -EFAULT on error reading the location
	216	* -EINVAL on a failed compare of the contents
	217	* -EPERM on error writing to the location
	218	* Any other value will be considered a failure.
	219	*/
31e88909 SR	220	extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
	221
	222
	223	/* May be defined in arch */
	224	extern int ftrace_arch_read_dyn_info(char *buf, int size);
593eb8a2	225
ecea656d AS	226	extern int skip_trace(unsigned long ip);
ecea656d AS	227
c0719e5a SR	228	extern void ftrace_release(void *start, unsigned long size);
	229
	230	extern void ftrace_disable_daemon(void);
	231	extern void ftrace_enable_daemon(void);
e1c08bdd	232	#else
ecea656d	233	# define skip_trace(ip) ({ 0; })
aeaee8a2 IM	234	# define ftrace_force_update() ({ 0; })
aeaee8a2 IM	235	# define ftrace_set_filter(buf, len, reset) do { } while (0)
ad90c0e3 SR	236	# define ftrace_disable_daemon() do { } while (0)
ad90c0e3 SR	237	# define ftrace_enable_daemon() do { } while (0)
c0719e5a	238	static inline void ftrace_release(void *start, unsigned long size) { }
f6180773 SR	239	static inline int register_ftrace_command(struct ftrace_func_command *cmd)
f6180773 SR	240	{
97d0bb8d	241	return -EINVAL;
f6180773 SR	242	}
	243	static inline int unregister_ftrace_command(char *cmd_name)
	244	{
97d0bb8d	245	return -EINVAL;
f6180773	246	}
ecea656d	247	#endif /* CONFIG_DYNAMIC_FTRACE */
352ad25a	248
aeaee8a2 IM	249	/* totally disable ftrace - can not re-enable after this */
	250	void ftrace_kill(void);
	251
f43fdad8 IM	252	static inline void tracer_disable(void)
f43fdad8 IM	253	{
606576ce	254	#ifdef CONFIG_FUNCTION_TRACER
f43fdad8 IM	255	ftrace_enabled = 0;
	256	#endif
	257	}
	258
37002735 HY	259	/*
37002735 HY	260	* Ftrace disable/restore without lock. Some synchronization mechanism
9bdeb7b5	261	* must be used to prevent ftrace_enabled to be changed between
37002735 HY	262	* disable/restore.
37002735 HY	263	*/
9bdeb7b5 HY	264	static inline int __ftrace_enabled_save(void)
9bdeb7b5 HY	265	{
606576ce	266	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	267	int saved_ftrace_enabled = ftrace_enabled;
	268	ftrace_enabled = 0;
	269	return saved_ftrace_enabled;
	270	#else
	271	return 0;
	272	#endif
	273	}
	274
	275	static inline void __ftrace_enabled_restore(int enabled)
	276	{
606576ce	277	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	278	ftrace_enabled = enabled;
	279	#endif
	280	}
	281
352ad25a SR	282	#ifdef CONFIG_FRAME_POINTER
	283	/* TODO: need to fix this for ARM */
	284	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	285	# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
	286	# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
	287	# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
	288	# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
	289	# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
86387f7e	290	# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
352ad25a SR	291	#else
	292	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	293	# define CALLER_ADDR1 0UL
	294	# define CALLER_ADDR2 0UL
	295	# define CALLER_ADDR3 0UL
	296	# define CALLER_ADDR4 0UL
	297	# define CALLER_ADDR5 0UL
86387f7e	298	# define CALLER_ADDR6 0UL
352ad25a SR	299	#endif
352ad25a SR	300
81d68a96	301	#ifdef CONFIG_IRQSOFF_TRACER
489f1396 IM	302	extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
489f1396 IM	303	extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
81d68a96 SR	304	#else
	305	# define time_hardirqs_on(a0, a1) do { } while (0)
	306	# define time_hardirqs_off(a0, a1) do { } while (0)
	307	#endif
	308
6cd8a4bb	309	#ifdef CONFIG_PREEMPT_TRACER
489f1396 IM	310	extern void trace_preempt_on(unsigned long a0, unsigned long a1);
489f1396 IM	311	extern void trace_preempt_off(unsigned long a0, unsigned long a1);
6cd8a4bb SR	312	#else
	313	# define trace_preempt_on(a0, a1) do { } while (0)
	314	# define trace_preempt_off(a0, a1) do { } while (0)
	315	#endif
	316
b1829d27	317	#ifdef CONFIG_TRACING
944ac425 SR	318	extern int ftrace_dump_on_oops;
944ac425 SR	319
0f048701 SR	320	extern void tracing_start(void);
0f048701 SR	321	extern void tracing_stop(void);
69bb54ec	322	extern void ftrace_off_permanent(void);
0f048701	323
74f4e369 IM	324	extern void
74f4e369 IM	325	ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
2f2c99db SR	326
	327	/**
	328	* ftrace_printk - printf formatting in the ftrace buffer
	329	* @fmt: the printf format for printing
	330	*
	331	* Note: __ftrace_printk is an internal function for ftrace_printk and
	332	* the @ip is passed in via the ftrace_printk macro.
	333	*
	334	* This function allows a kernel developer to debug fast path sections
	335	* that printk is not appropriate for. By scattering in various
	336	* printk like tracing in the code, a developer can quickly see
	337	* where problems are occurring.
	338	*
	339	* This is intended as a debugging tool for the developer only.
	340	* Please refrain from leaving ftrace_printks scattered around in
	341	* your code.
	342	*/
	343	# define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt)
dd0e545f SR	344	extern int
	345	__ftrace_printk(unsigned long ip, const char *fmt, ...)
	346	__attribute__ ((format (printf, 2, 3)));
9011262a ACM	347	# define ftrace_vprintk(fmt, ap) __ftrace_printk(_THIS_IP_, fmt, ap)
	348	extern int
	349	__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
3f5a54e3	350	extern void ftrace_dump(void);
74f4e369 IM	351	#else
	352	static inline void
	353	ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
dd0e545f	354	static inline int
3ddeb912	355	ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
7b928c23	356
0f048701 SR	357	static inline void tracing_start(void) { }
0f048701 SR	358	static inline void tracing_stop(void) { }
69bb54ec	359	static inline void ftrace_off_permanent(void) { }
7b928c23 IM	360	static inline int
7b928c23 IM	361	ftrace_printk(const char *fmt, ...)
dd0e545f SR	362	{
	363	return 0;
	364	}
9011262a ACM	365	static inline int
	366	ftrace_vprintk(const char *fmt, va_list ap)
	367	{
	368	return 0;
	369	}
3f5a54e3	370	static inline void ftrace_dump(void) { }
74f4e369 IM	371	#endif
74f4e369 IM	372
68bf21aa SR	373	#ifdef CONFIG_FTRACE_MCOUNT_RECORD
68bf21aa SR	374	extern void ftrace_init(void);
31e88909 SR	375	extern void ftrace_init_module(struct module *mod,
31e88909 SR	376	unsigned long start, unsigned long end);
68bf21aa SR	377	#else
68bf21aa SR	378	static inline void ftrace_init(void) { }
90d595fe	379	static inline void
31e88909 SR	380	ftrace_init_module(struct module *mod,
31e88909 SR	381	unsigned long start, unsigned long end) { }
68bf21aa SR	382	#endif
68bf21aa SR	383
287b6e68 FW	384	/*
	385	* Structure that defines an entry function trace.
	386	*/
	387	struct ftrace_graph_ent {
	388	unsigned long func; /* Current function */
	389	int depth;
	390	};
dd0e545f	391
caf4b323 FW	392	/*
	393	* Structure that defines a return function trace.
	394	*/
fb52607a	395	struct ftrace_graph_ret {
caf4b323 FW	396	unsigned long func; /* Current function */
	397	unsigned long long calltime;
	398	unsigned long long rettime;
0231022c FW	399	/* Number of functions that overran the depth limit for current task */
0231022c FW	400	unsigned long overrun;
287b6e68	401	int depth;
caf4b323 FW	402	};
caf4b323 FW	403
fb52607a	404	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
8b96f011 FW	405
	406	/*
	407	* Sometimes we don't want to trace a function with the function
	408	* graph tracer but we want them to keep traced by the usual function
	409	* tracer if the function graph tracer is not configured.
	410	*/
	411	#define __notrace_funcgraph notrace
	412
bcbc4f20 FW	413	/*
	414	* We want to which function is an entrypoint of a hardirq.
	415	* That will help us to put a signal on output.
	416	*/
	417	#define __irq_entry __attribute__((__section__(".irqentry.text")))
	418
	419	/* Limits of hardirq entrypoints */
	420	extern char __irqentry_text_start[];
	421	extern char __irqentry_text_end[];
	422
f201ae23 FW	423	#define FTRACE_RETFUNC_DEPTH 50
f201ae23 FW	424	#define FTRACE_RETSTACK_ALLOC_SIZE 32
287b6e68 FW	425	/* Type of the callback handlers for tracing function graph*/
287b6e68 FW	426	typedef void (trace_func_graph_ret_t)(struct ftrace_graph_ret ); /* return */
e49dc19c	427	typedef int (trace_func_graph_ent_t)(struct ftrace_graph_ent ); /* entry */
287b6e68 FW	428
	429	extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
	430	trace_func_graph_ent_t entryfunc);
	431
14a866c5 SR	432	extern void ftrace_graph_stop(void);
14a866c5 SR	433
287b6e68 FW	434	/* The current handlers in use */
	435	extern trace_func_graph_ret_t ftrace_graph_return;
	436	extern trace_func_graph_ent_t ftrace_graph_entry;
caf4b323	437
fb52607a	438	extern void unregister_ftrace_graph(void);
f201ae23	439
fb52607a FW	440	extern void ftrace_graph_init_task(struct task_struct *t);
fb52607a FW	441	extern void ftrace_graph_exit_task(struct task_struct *t);
21a8c466 FW	442
	443	static inline int task_curr_ret_stack(struct task_struct *t)
	444	{
	445	return t->curr_ret_stack;
	446	}
380c4b14 FW	447
	448	static inline void pause_graph_tracing(void)
	449	{
	450	atomic_inc(&current->tracing_graph_pause);
	451	}
	452
	453	static inline void unpause_graph_tracing(void)
	454	{
	455	atomic_dec(&current->tracing_graph_pause);
	456	}
82f60f0b	457	#else
8b96f011 FW	458
8b96f011 FW	459	#define __notrace_funcgraph
bcbc4f20	460	#define __irq_entry
8b96f011	461
fb52607a FW	462	static inline void ftrace_graph_init_task(struct task_struct *t) { }
fb52607a FW	463	static inline void ftrace_graph_exit_task(struct task_struct *t) { }
21a8c466 FW	464
	465	static inline int task_curr_ret_stack(struct task_struct *tsk)
	466	{
	467	return -1;
	468	}
380c4b14 FW	469
	470	static inline void pause_graph_tracing(void) { }
	471	static inline void unpause_graph_tracing(void) { }
caf4b323 FW	472	#endif
caf4b323 FW	473
ea4e2bc4 SR	474	#ifdef CONFIG_TRACING
	475	#include <linux/sched.h>
	476
	477	/* flags for current->trace */
	478	enum {
	479	TSK_TRACE_FL_TRACE_BIT = 0,
	480	TSK_TRACE_FL_GRAPH_BIT = 1,
	481	};
	482	enum {
	483	TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
	484	TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
	485	};
	486
	487	static inline void set_tsk_trace_trace(struct task_struct *tsk)
	488	{
	489	set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	490	}
	491
	492	static inline void clear_tsk_trace_trace(struct task_struct *tsk)
	493	{
	494	clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	495	}
	496
	497	static inline int test_tsk_trace_trace(struct task_struct *tsk)
	498	{
	499	return tsk->trace & TSK_TRACE_FL_TRACE;
	500	}
	501
	502	static inline void set_tsk_trace_graph(struct task_struct *tsk)
	503	{
	504	set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	505	}
	506
	507	static inline void clear_tsk_trace_graph(struct task_struct *tsk)
	508	{
	509	clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	510	}
	511
	512	static inline int test_tsk_trace_graph(struct task_struct *tsk)
	513	{
	514	return tsk->trace & TSK_TRACE_FL_GRAPH;
	515	}
	516
	517	#endif /* CONFIG_TRACING */
	518
b1818748 MM	519
	520	#ifdef CONFIG_HW_BRANCH_TRACER
	521
	522	void trace_hw_branch(u64 from, u64 to);
	523	void trace_hw_branch_oops(void);
	524
	525	#else /* CONFIG_HW_BRANCH_TRACER */
	526
	527	static inline void trace_hw_branch(u64 from, u64 to) {}
	528	static inline void trace_hw_branch_oops(void) {}
	529
	530	#endif /* CONFIG_HW_BRANCH_TRACER */
	531
16444a8a	532	#endif /* _LINUX_FTRACE_H */