[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/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_DYNAMIC_FTRACE
/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
#include <asm/ftrace.h>

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);

/* 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);
#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 top
 * @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) { }
#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)));
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, 0)));

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 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

enum {
	POWER_NONE = 0,
	POWER_CSTATE = 1,
	POWER_PSTATE = 2,
};

struct power_trace {
#ifdef CONFIG_POWER_TRACER
	ktime_t			stamp;
	ktime_t			end;
	int			type;
	int			state;
#endif
};

#ifdef CONFIG_POWER_TRACER
extern void trace_power_start(struct power_trace *it, unsigned int type,
					unsigned int state);
extern void trace_power_mark(struct power_trace *it, unsigned int type,
					unsigned int state);
extern void trace_power_end(struct power_trace *it);
#else
static inline void trace_power_start(struct power_trace *it, unsigned int type,
					unsigned int state) { }
static inline void trace_power_mark(struct power_trace *it, unsigned int type,
					unsigned int state) { }
static inline void trace_power_end(struct power_trace *it) { }
#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
#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;
}
#else
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;
}
#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 */

#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>
5601020f	9	#include <linux/kallsyms.h>
ea4e2bc4	10	#include <linux/bitops.h>
21a8c466	11	#include <linux/sched.h>
16444a8a	12
606576ce	13	#ifdef CONFIG_FUNCTION_TRACER
3e1932ad	14
b0fc494f SR	15	extern int ftrace_enabled;
	16	extern int
	17	ftrace_enable_sysctl(struct ctl_table *table, int write,
	18	struct file filp, void __user buffer, size_t *lenp,
	19	loff_t *ppos);
	20
16444a8a ACM	21	typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
	22
	23	struct ftrace_ops {
	24	ftrace_func_t func;
	25	struct ftrace_ops *next;
	26	};
	27
60a7ecf4 SR	28	extern int function_trace_stop;
60a7ecf4 SR	29
e7d3737e FW	30	/*
	31	* Type of the current tracing.
	32	*/
	33	enum ftrace_tracing_type_t {
	34	FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
	35	FTRACE_TYPE_RETURN, /* Hook the return of the function */
	36	};
	37
	38	/* Current tracing type, default is FTRACE_TYPE_ENTER */
	39	extern enum ftrace_tracing_type_t ftrace_tracing_type;
	40
60a7ecf4 SR	41	/**
	42	* ftrace_stop - stop function tracer.
	43	*
	44	* A quick way to stop the function tracer. Note this an on off switch,
	45	* it is not something that is recursive like preempt_disable.
	46	* This does not disable the calling of mcount, it only stops the
	47	* calling of functions from mcount.
	48	*/
	49	static inline void ftrace_stop(void)
	50	{
	51	function_trace_stop = 1;
	52	}
	53
	54	/**
	55	* ftrace_start - start the function tracer.
	56	*
	57	* This function is the inverse of ftrace_stop. This does not enable
	58	* the function tracing if the function tracer is disabled. This only
	59	* sets the function tracer flag to continue calling the functions
	60	* from mcount.
	61	*/
	62	static inline void ftrace_start(void)
	63	{
	64	function_trace_stop = 0;
	65	}
	66
16444a8a ACM	67	/*
	68	* The ftrace_ops must be a static and should also
	69	* be read_mostly. These functions do modify read_mostly variables
	70	* so use them sparely. Never free an ftrace_op or modify the
	71	* next pointer after it has been registered. Even after unregistering
	72	* it, the next pointer may still be used internally.
	73	*/
	74	int register_ftrace_function(struct ftrace_ops *ops);
	75	int unregister_ftrace_function(struct ftrace_ops *ops);
	76	void clear_ftrace_function(void);
	77
	78	extern void ftrace_stub(unsigned long a0, unsigned long a1);
16444a8a	79
606576ce	80	#else /* !CONFIG_FUNCTION_TRACER */
16444a8a ACM	81	# define register_ftrace_function(ops) do { } while (0)
	82	# define unregister_ftrace_function(ops) do { } while (0)
	83	# define clear_ftrace_function(ops) do { } while (0)
81adbdc0	84	static inline void ftrace_kill(void) { }
60a7ecf4 SR	85	static inline void ftrace_stop(void) { }
60a7ecf4 SR	86	static inline void ftrace_start(void) { }
606576ce	87	#endif /* CONFIG_FUNCTION_TRACER */
352ad25a	88
3d083395	89	#ifdef CONFIG_DYNAMIC_FTRACE
31e88909 SR	90	/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
	91	#include <asm/ftrace.h>
	92
3c1720f0	93	enum {
37ad5084 SR	94	FTRACE_FL_FREE = (1 << 0),
	95	FTRACE_FL_FAILED = (1 << 1),
	96	FTRACE_FL_FILTER = (1 << 2),
	97	FTRACE_FL_ENABLED = (1 << 3),
41c52c0d	98	FTRACE_FL_NOTRACE = (1 << 4),
0eb96701	99	FTRACE_FL_CONVERTED = (1 << 5),
ecea656d	100	FTRACE_FL_FROZEN = (1 << 6),
3c1720f0 SR	101	};
3c1720f0 SR	102
3d083395	103	struct dyn_ftrace {
08f5ac90 SR	104	struct list_head list;
	105	unsigned long ip; /* address of mcount call-site */
	106	unsigned long flags;
31e88909	107	struct dyn_arch_ftrace arch;
3d083395 SR	108	};
3d083395 SR	109
e1c08bdd	110	int ftrace_force_update(void);
77a2b37d	111	void ftrace_set_filter(unsigned char *buf, int len, int reset);
e1c08bdd	112
3d083395	113	/* defined in arch */
3c1720f0	114	extern int ftrace_ip_converted(unsigned long ip);
d61f82d0	115	extern int ftrace_dyn_arch_init(void *data);
d61f82d0 SR	116	extern int ftrace_update_ftrace_func(ftrace_func_t func);
	117	extern void ftrace_caller(void);
	118	extern void ftrace_call(void);
	119	extern void mcount_call(void);
fb52607a FW	120	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
fb52607a FW	121	extern void ftrace_graph_caller(void);
5a45cfe1 SR	122	extern int ftrace_enable_ftrace_graph_caller(void);
	123	extern int ftrace_disable_ftrace_graph_caller(void);
	124	#else
	125	static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
	126	static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
e7d3737e	127	#endif
ad90c0e3	128
31e88909 SR	129	/**
	130	* ftrace_make_nop - convert code into top
	131	* @mod: module structure if called by module load initialization
	132	* @rec: the mcount call site record
	133	* @addr: the address that the call site should be calling
	134	*
	135	* This is a very sensitive operation and great care needs
	136	* to be taken by the arch. The operation should carefully
	137	* read the location, check to see if what is read is indeed
	138	* what we expect it to be, and then on success of the compare,
	139	* it should write to the location.
	140	*
	141	* The code segment at @rec->ip should be a caller to @addr
	142	*
	143	* Return must be:
	144	* 0 on success
	145	* -EFAULT on error reading the location
	146	* -EINVAL on a failed compare of the contents
	147	* -EPERM on error writing to the location
	148	* Any other value will be considered a failure.
	149	*/
	150	extern int ftrace_make_nop(struct module *mod,
	151	struct dyn_ftrace *rec, unsigned long addr);
a26a2a27	152
593eb8a2	153	/**
31e88909 SR	154	* ftrace_make_call - convert a nop call site into a call to addr
	155	* @rec: the mcount call site record
	156	* @addr: the address that the call site should call
593eb8a2 SR	157	*
	158	* This is a very sensitive operation and great care needs
	159	* to be taken by the arch. The operation should carefully
	160	* read the location, check to see if what is read is indeed
	161	* what we expect it to be, and then on success of the compare,
	162	* it should write to the location.
	163	*
31e88909 SR	164	* The code segment at @rec->ip should be a nop
31e88909 SR	165	*
593eb8a2 SR	166	* Return must be:
	167	* 0 on success
	168	* -EFAULT on error reading the location
	169	* -EINVAL on a failed compare of the contents
	170	* -EPERM on error writing to the location
	171	* Any other value will be considered a failure.
	172	*/
31e88909 SR	173	extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
	174
	175
	176	/* May be defined in arch */
	177	extern int ftrace_arch_read_dyn_info(char *buf, int size);
593eb8a2	178
ecea656d AS	179	extern int skip_trace(unsigned long ip);
ecea656d AS	180
c0719e5a SR	181	extern void ftrace_release(void *start, unsigned long size);
	182
	183	extern void ftrace_disable_daemon(void);
	184	extern void ftrace_enable_daemon(void);
e1c08bdd	185	#else
ecea656d	186	# define skip_trace(ip) ({ 0; })
aeaee8a2 IM	187	# define ftrace_force_update() ({ 0; })
aeaee8a2 IM	188	# define ftrace_set_filter(buf, len, reset) do { } while (0)
ad90c0e3 SR	189	# define ftrace_disable_daemon() do { } while (0)
ad90c0e3 SR	190	# define ftrace_enable_daemon() do { } while (0)
c0719e5a	191	static inline void ftrace_release(void *start, unsigned long size) { }
ecea656d	192	#endif /* CONFIG_DYNAMIC_FTRACE */
352ad25a	193
aeaee8a2 IM	194	/* totally disable ftrace - can not re-enable after this */
	195	void ftrace_kill(void);
	196
f43fdad8 IM	197	static inline void tracer_disable(void)
f43fdad8 IM	198	{
606576ce	199	#ifdef CONFIG_FUNCTION_TRACER
f43fdad8 IM	200	ftrace_enabled = 0;
	201	#endif
	202	}
	203
37002735 HY	204	/*
37002735 HY	205	* Ftrace disable/restore without lock. Some synchronization mechanism
9bdeb7b5	206	* must be used to prevent ftrace_enabled to be changed between
37002735 HY	207	* disable/restore.
37002735 HY	208	*/
9bdeb7b5 HY	209	static inline int __ftrace_enabled_save(void)
9bdeb7b5 HY	210	{
606576ce	211	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	212	int saved_ftrace_enabled = ftrace_enabled;
	213	ftrace_enabled = 0;
	214	return saved_ftrace_enabled;
	215	#else
	216	return 0;
	217	#endif
	218	}
	219
	220	static inline void __ftrace_enabled_restore(int enabled)
	221	{
606576ce	222	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	223	ftrace_enabled = enabled;
	224	#endif
	225	}
	226
352ad25a SR	227	#ifdef CONFIG_FRAME_POINTER
	228	/* TODO: need to fix this for ARM */
	229	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	230	# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
	231	# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
	232	# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
	233	# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
	234	# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
86387f7e	235	# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
352ad25a SR	236	#else
	237	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	238	# define CALLER_ADDR1 0UL
	239	# define CALLER_ADDR2 0UL
	240	# define CALLER_ADDR3 0UL
	241	# define CALLER_ADDR4 0UL
	242	# define CALLER_ADDR5 0UL
86387f7e	243	# define CALLER_ADDR6 0UL
352ad25a SR	244	#endif
352ad25a SR	245
81d68a96	246	#ifdef CONFIG_IRQSOFF_TRACER
489f1396 IM	247	extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
489f1396 IM	248	extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
81d68a96 SR	249	#else
	250	# define time_hardirqs_on(a0, a1) do { } while (0)
	251	# define time_hardirqs_off(a0, a1) do { } while (0)
	252	#endif
	253
6cd8a4bb	254	#ifdef CONFIG_PREEMPT_TRACER
489f1396 IM	255	extern void trace_preempt_on(unsigned long a0, unsigned long a1);
489f1396 IM	256	extern void trace_preempt_off(unsigned long a0, unsigned long a1);
6cd8a4bb SR	257	#else
	258	# define trace_preempt_on(a0, a1) do { } while (0)
	259	# define trace_preempt_off(a0, a1) do { } while (0)
	260	#endif
	261
b1829d27	262	#ifdef CONFIG_TRACING
944ac425 SR	263	extern int ftrace_dump_on_oops;
944ac425 SR	264
0f048701 SR	265	extern void tracing_start(void);
0f048701 SR	266	extern void tracing_stop(void);
69bb54ec	267	extern void ftrace_off_permanent(void);
0f048701	268
74f4e369 IM	269	extern void
74f4e369 IM	270	ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
2f2c99db SR	271
	272	/**
	273	* ftrace_printk - printf formatting in the ftrace buffer
	274	* @fmt: the printf format for printing
	275	*
	276	* Note: __ftrace_printk is an internal function for ftrace_printk and
	277	* the @ip is passed in via the ftrace_printk macro.
	278	*
	279	* This function allows a kernel developer to debug fast path sections
	280	* that printk is not appropriate for. By scattering in various
	281	* printk like tracing in the code, a developer can quickly see
	282	* where problems are occurring.
	283	*
	284	* This is intended as a debugging tool for the developer only.
	285	* Please refrain from leaving ftrace_printks scattered around in
	286	* your code.
	287	*/
	288	# define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt)
dd0e545f SR	289	extern int
	290	__ftrace_printk(unsigned long ip, const char *fmt, ...)
	291	__attribute__ ((format (printf, 2, 3)));
3f5a54e3	292	extern void ftrace_dump(void);
74f4e369 IM	293	#else
	294	static inline void
	295	ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
dd0e545f	296	static inline int
7b928c23 IM	297	ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 0)));
7b928c23 IM	298
0f048701 SR	299	static inline void tracing_start(void) { }
0f048701 SR	300	static inline void tracing_stop(void) { }
69bb54ec	301	static inline void ftrace_off_permanent(void) { }
7b928c23 IM	302	static inline int
7b928c23 IM	303	ftrace_printk(const char *fmt, ...)
dd0e545f SR	304	{
	305	return 0;
	306	}
3f5a54e3	307	static inline void ftrace_dump(void) { }
74f4e369 IM	308	#endif
74f4e369 IM	309
68bf21aa SR	310	#ifdef CONFIG_FTRACE_MCOUNT_RECORD
68bf21aa SR	311	extern void ftrace_init(void);
31e88909 SR	312	extern void ftrace_init_module(struct module *mod,
31e88909 SR	313	unsigned long start, unsigned long end);
68bf21aa SR	314	#else
68bf21aa SR	315	static inline void ftrace_init(void) { }
90d595fe	316	static inline void
31e88909 SR	317	ftrace_init_module(struct module *mod,
31e88909 SR	318	unsigned long start, unsigned long end) { }
68bf21aa SR	319	#endif
68bf21aa SR	320
f3f47a67 AV	321	enum {
	322	POWER_NONE = 0,
	323	POWER_CSTATE = 1,
	324	POWER_PSTATE = 2,
	325	};
	326
	327	struct power_trace {
	328	#ifdef CONFIG_POWER_TRACER
	329	ktime_t stamp;
	330	ktime_t end;
	331	int type;
	332	int state;
	333	#endif
	334	};
	335
	336	#ifdef CONFIG_POWER_TRACER
	337	extern void trace_power_start(struct power_trace *it, unsigned int type,
	338	unsigned int state);
	339	extern void trace_power_mark(struct power_trace *it, unsigned int type,
	340	unsigned int state);
	341	extern void trace_power_end(struct power_trace *it);
	342	#else
	343	static inline void trace_power_start(struct power_trace *it, unsigned int type,
	344	unsigned int state) { }
	345	static inline void trace_power_mark(struct power_trace *it, unsigned int type,
	346	unsigned int state) { }
	347	static inline void trace_power_end(struct power_trace *it) { }
	348	#endif
	349
dd0e545f	350
287b6e68 FW	351	/*
	352	* Structure that defines an entry function trace.
	353	*/
	354	struct ftrace_graph_ent {
	355	unsigned long func; /* Current function */
	356	int depth;
	357	};
dd0e545f	358
caf4b323 FW	359	/*
	360	* Structure that defines a return function trace.
	361	*/
fb52607a	362	struct ftrace_graph_ret {
caf4b323 FW	363	unsigned long func; /* Current function */
	364	unsigned long long calltime;
	365	unsigned long long rettime;
0231022c FW	366	/* Number of functions that overran the depth limit for current task */
0231022c FW	367	unsigned long overrun;
287b6e68	368	int depth;
caf4b323 FW	369	};
caf4b323 FW	370
fb52607a	371	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
f201ae23 FW	372	#define FTRACE_RETFUNC_DEPTH 50
f201ae23 FW	373	#define FTRACE_RETSTACK_ALLOC_SIZE 32
287b6e68 FW	374	/* Type of the callback handlers for tracing function graph*/
287b6e68 FW	375	typedef void (trace_func_graph_ret_t)(struct ftrace_graph_ret ); /* return */
e49dc19c	376	typedef int (trace_func_graph_ent_t)(struct ftrace_graph_ent ); /* entry */
287b6e68 FW	377
	378	extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
	379	trace_func_graph_ent_t entryfunc);
	380
14a866c5 SR	381	extern void ftrace_graph_stop(void);
14a866c5 SR	382
287b6e68 FW	383	/* The current handlers in use */
	384	extern trace_func_graph_ret_t ftrace_graph_return;
	385	extern trace_func_graph_ent_t ftrace_graph_entry;
caf4b323	386
fb52607a	387	extern void unregister_ftrace_graph(void);
f201ae23	388
fb52607a FW	389	extern void ftrace_graph_init_task(struct task_struct *t);
fb52607a FW	390	extern void ftrace_graph_exit_task(struct task_struct *t);
21a8c466 FW	391
	392	static inline int task_curr_ret_stack(struct task_struct *t)
	393	{
	394	return t->curr_ret_stack;
	395	}
82f60f0b	396	#else
fb52607a FW	397	static inline void ftrace_graph_init_task(struct task_struct *t) { }
fb52607a FW	398	static inline void ftrace_graph_exit_task(struct task_struct *t) { }
21a8c466 FW	399
	400	static inline int task_curr_ret_stack(struct task_struct *tsk)
	401	{
	402	return -1;
	403	}
caf4b323 FW	404	#endif
caf4b323 FW	405
ea4e2bc4 SR	406	#ifdef CONFIG_TRACING
	407	#include <linux/sched.h>
	408
	409	/* flags for current->trace */
	410	enum {
	411	TSK_TRACE_FL_TRACE_BIT = 0,
	412	TSK_TRACE_FL_GRAPH_BIT = 1,
	413	};
	414	enum {
	415	TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
	416	TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
	417	};
	418
	419	static inline void set_tsk_trace_trace(struct task_struct *tsk)
	420	{
	421	set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	422	}
	423
	424	static inline void clear_tsk_trace_trace(struct task_struct *tsk)
	425	{
	426	clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	427	}
	428
	429	static inline int test_tsk_trace_trace(struct task_struct *tsk)
	430	{
	431	return tsk->trace & TSK_TRACE_FL_TRACE;
	432	}
	433
	434	static inline void set_tsk_trace_graph(struct task_struct *tsk)
	435	{
	436	set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	437	}
	438
	439	static inline void clear_tsk_trace_graph(struct task_struct *tsk)
	440	{
	441	clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	442	}
	443
	444	static inline int test_tsk_trace_graph(struct task_struct *tsk)
	445	{
	446	return tsk->trace & TSK_TRACE_FL_GRAPH;
	447	}
	448
	449	#endif /* CONFIG_TRACING */
	450
16444a8a	451	#endif /* _LINUX_FTRACE_H */