[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>

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