[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

#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);

#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 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, 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 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

/*
 * 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 */

#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
3d083395	98	#ifdef CONFIG_DYNAMIC_FTRACE
31e88909 SR	99	/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
	100	#include <asm/ftrace.h>
	101
3c1720f0	102	enum {
37ad5084 SR	103	FTRACE_FL_FREE = (1 << 0),
	104	FTRACE_FL_FAILED = (1 << 1),
	105	FTRACE_FL_FILTER = (1 << 2),
	106	FTRACE_FL_ENABLED = (1 << 3),
41c52c0d	107	FTRACE_FL_NOTRACE = (1 << 4),
0eb96701	108	FTRACE_FL_CONVERTED = (1 << 5),
ecea656d	109	FTRACE_FL_FROZEN = (1 << 6),
3c1720f0 SR	110	};
3c1720f0 SR	111
3d083395	112	struct dyn_ftrace {
08f5ac90 SR	113	struct list_head list;
	114	unsigned long ip; /* address of mcount call-site */
	115	unsigned long flags;
31e88909	116	struct dyn_arch_ftrace arch;
3d083395 SR	117	};
3d083395 SR	118
e1c08bdd	119	int ftrace_force_update(void);
77a2b37d	120	void ftrace_set_filter(unsigned char *buf, int len, int reset);
e1c08bdd	121
3d083395	122	/* defined in arch */
3c1720f0	123	extern int ftrace_ip_converted(unsigned long ip);
d61f82d0	124	extern int ftrace_dyn_arch_init(void *data);
d61f82d0 SR	125	extern int ftrace_update_ftrace_func(ftrace_func_t func);
	126	extern void ftrace_caller(void);
	127	extern void ftrace_call(void);
	128	extern void mcount_call(void);
f0001207 SL	129
	130	#ifndef FTRACE_ADDR
	131	#define FTRACE_ADDR ((unsigned long)ftrace_caller)
	132	#endif
fb52607a FW	133	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
fb52607a FW	134	extern void ftrace_graph_caller(void);
5a45cfe1 SR	135	extern int ftrace_enable_ftrace_graph_caller(void);
	136	extern int ftrace_disable_ftrace_graph_caller(void);
	137	#else
	138	static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
	139	static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
e7d3737e	140	#endif
ad90c0e3	141
31e88909 SR	142	/**
	143	* ftrace_make_nop - convert code into top
	144	* @mod: module structure if called by module load initialization
	145	* @rec: the mcount call site record
	146	* @addr: the address that the call site should be calling
	147	*
	148	* This is a very sensitive operation and great care needs
	149	* to be taken by the arch. The operation should carefully
	150	* read the location, check to see if what is read is indeed
	151	* what we expect it to be, and then on success of the compare,
	152	* it should write to the location.
	153	*
	154	* The code segment at @rec->ip should be a caller to @addr
	155	*
	156	* Return must be:
	157	* 0 on success
	158	* -EFAULT on error reading the location
	159	* -EINVAL on a failed compare of the contents
	160	* -EPERM on error writing to the location
	161	* Any other value will be considered a failure.
	162	*/
	163	extern int ftrace_make_nop(struct module *mod,
	164	struct dyn_ftrace *rec, unsigned long addr);
a26a2a27	165
593eb8a2	166	/**
31e88909 SR	167	* ftrace_make_call - convert a nop call site into a call to addr
	168	* @rec: the mcount call site record
	169	* @addr: the address that the call site should call
593eb8a2 SR	170	*
	171	* This is a very sensitive operation and great care needs
	172	* to be taken by the arch. The operation should carefully
	173	* read the location, check to see if what is read is indeed
	174	* what we expect it to be, and then on success of the compare,
	175	* it should write to the location.
	176	*
31e88909 SR	177	* The code segment at @rec->ip should be a nop
31e88909 SR	178	*
593eb8a2 SR	179	* Return must be:
	180	* 0 on success
	181	* -EFAULT on error reading the location
	182	* -EINVAL on a failed compare of the contents
	183	* -EPERM on error writing to the location
	184	* Any other value will be considered a failure.
	185	*/
31e88909 SR	186	extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
	187
	188
	189	/* May be defined in arch */
	190	extern int ftrace_arch_read_dyn_info(char *buf, int size);
593eb8a2	191
ecea656d AS	192	extern int skip_trace(unsigned long ip);
ecea656d AS	193
c0719e5a SR	194	extern void ftrace_release(void *start, unsigned long size);
	195
	196	extern void ftrace_disable_daemon(void);
	197	extern void ftrace_enable_daemon(void);
e1c08bdd	198	#else
ecea656d	199	# define skip_trace(ip) ({ 0; })
aeaee8a2 IM	200	# define ftrace_force_update() ({ 0; })
aeaee8a2 IM	201	# define ftrace_set_filter(buf, len, reset) do { } while (0)
ad90c0e3 SR	202	# define ftrace_disable_daemon() do { } while (0)
ad90c0e3 SR	203	# define ftrace_enable_daemon() do { } while (0)
c0719e5a	204	static inline void ftrace_release(void *start, unsigned long size) { }
ecea656d	205	#endif /* CONFIG_DYNAMIC_FTRACE */
352ad25a	206
aeaee8a2 IM	207	/* totally disable ftrace - can not re-enable after this */
	208	void ftrace_kill(void);
	209
f43fdad8 IM	210	static inline void tracer_disable(void)
f43fdad8 IM	211	{
606576ce	212	#ifdef CONFIG_FUNCTION_TRACER
f43fdad8 IM	213	ftrace_enabled = 0;
	214	#endif
	215	}
	216
37002735 HY	217	/*
37002735 HY	218	* Ftrace disable/restore without lock. Some synchronization mechanism
9bdeb7b5	219	* must be used to prevent ftrace_enabled to be changed between
37002735 HY	220	* disable/restore.
37002735 HY	221	*/
9bdeb7b5 HY	222	static inline int __ftrace_enabled_save(void)
9bdeb7b5 HY	223	{
606576ce	224	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	225	int saved_ftrace_enabled = ftrace_enabled;
	226	ftrace_enabled = 0;
	227	return saved_ftrace_enabled;
	228	#else
	229	return 0;
	230	#endif
	231	}
	232
	233	static inline void __ftrace_enabled_restore(int enabled)
	234	{
606576ce	235	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	236	ftrace_enabled = enabled;
	237	#endif
	238	}
	239
352ad25a SR	240	#ifdef CONFIG_FRAME_POINTER
	241	/* TODO: need to fix this for ARM */
	242	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	243	# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
	244	# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
	245	# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
	246	# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
	247	# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
86387f7e	248	# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
352ad25a SR	249	#else
	250	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	251	# define CALLER_ADDR1 0UL
	252	# define CALLER_ADDR2 0UL
	253	# define CALLER_ADDR3 0UL
	254	# define CALLER_ADDR4 0UL
	255	# define CALLER_ADDR5 0UL
86387f7e	256	# define CALLER_ADDR6 0UL
352ad25a SR	257	#endif
352ad25a SR	258
81d68a96	259	#ifdef CONFIG_IRQSOFF_TRACER
489f1396 IM	260	extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
489f1396 IM	261	extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
81d68a96 SR	262	#else
	263	# define time_hardirqs_on(a0, a1) do { } while (0)
	264	# define time_hardirqs_off(a0, a1) do { } while (0)
	265	#endif
	266
6cd8a4bb	267	#ifdef CONFIG_PREEMPT_TRACER
489f1396 IM	268	extern void trace_preempt_on(unsigned long a0, unsigned long a1);
489f1396 IM	269	extern void trace_preempt_off(unsigned long a0, unsigned long a1);
6cd8a4bb SR	270	#else
	271	# define trace_preempt_on(a0, a1) do { } while (0)
	272	# define trace_preempt_off(a0, a1) do { } while (0)
	273	#endif
	274
b1829d27	275	#ifdef CONFIG_TRACING
944ac425 SR	276	extern int ftrace_dump_on_oops;
944ac425 SR	277
0f048701 SR	278	extern void tracing_start(void);
0f048701 SR	279	extern void tracing_stop(void);
69bb54ec	280	extern void ftrace_off_permanent(void);
0f048701	281
74f4e369 IM	282	extern void
74f4e369 IM	283	ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
2f2c99db SR	284
	285	/**
	286	* ftrace_printk - printf formatting in the ftrace buffer
	287	* @fmt: the printf format for printing
	288	*
	289	* Note: __ftrace_printk is an internal function for ftrace_printk and
	290	* the @ip is passed in via the ftrace_printk macro.
	291	*
	292	* This function allows a kernel developer to debug fast path sections
	293	* that printk is not appropriate for. By scattering in various
	294	* printk like tracing in the code, a developer can quickly see
	295	* where problems are occurring.
	296	*
	297	* This is intended as a debugging tool for the developer only.
	298	* Please refrain from leaving ftrace_printks scattered around in
	299	* your code.
	300	*/
	301	# define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt)
dd0e545f SR	302	extern int
	303	__ftrace_printk(unsigned long ip, const char *fmt, ...)
	304	__attribute__ ((format (printf, 2, 3)));
3f5a54e3	305	extern void ftrace_dump(void);
74f4e369 IM	306	#else
	307	static inline void
	308	ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
dd0e545f	309	static inline int
3ddeb912	310	ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
7b928c23	311
0f048701 SR	312	static inline void tracing_start(void) { }
0f048701 SR	313	static inline void tracing_stop(void) { }
69bb54ec	314	static inline void ftrace_off_permanent(void) { }
7b928c23 IM	315	static inline int
7b928c23 IM	316	ftrace_printk(const char *fmt, ...)
dd0e545f SR	317	{
	318	return 0;
	319	}
3f5a54e3	320	static inline void ftrace_dump(void) { }
74f4e369 IM	321	#endif
74f4e369 IM	322
68bf21aa SR	323	#ifdef CONFIG_FTRACE_MCOUNT_RECORD
68bf21aa SR	324	extern void ftrace_init(void);
31e88909 SR	325	extern void ftrace_init_module(struct module *mod,
31e88909 SR	326	unsigned long start, unsigned long end);
68bf21aa SR	327	#else
68bf21aa SR	328	static inline void ftrace_init(void) { }
90d595fe	329	static inline void
31e88909 SR	330	ftrace_init_module(struct module *mod,
31e88909 SR	331	unsigned long start, unsigned long end) { }
68bf21aa SR	332	#endif
68bf21aa SR	333
f3f47a67 AV	334	enum {
	335	POWER_NONE = 0,
	336	POWER_CSTATE = 1,
	337	POWER_PSTATE = 2,
	338	};
	339
	340	struct power_trace {
	341	#ifdef CONFIG_POWER_TRACER
	342	ktime_t stamp;
	343	ktime_t end;
	344	int type;
	345	int state;
	346	#endif
	347	};
	348
	349	#ifdef CONFIG_POWER_TRACER
	350	extern void trace_power_start(struct power_trace *it, unsigned int type,
	351	unsigned int state);
	352	extern void trace_power_mark(struct power_trace *it, unsigned int type,
	353	unsigned int state);
	354	extern void trace_power_end(struct power_trace *it);
	355	#else
	356	static inline void trace_power_start(struct power_trace *it, unsigned int type,
	357	unsigned int state) { }
	358	static inline void trace_power_mark(struct power_trace *it, unsigned int type,
	359	unsigned int state) { }
	360	static inline void trace_power_end(struct power_trace *it) { }
	361	#endif
	362
dd0e545f	363
287b6e68 FW	364	/*
	365	* Structure that defines an entry function trace.
	366	*/
	367	struct ftrace_graph_ent {
	368	unsigned long func; /* Current function */
	369	int depth;
	370	};
dd0e545f	371
caf4b323 FW	372	/*
	373	* Structure that defines a return function trace.
	374	*/
fb52607a	375	struct ftrace_graph_ret {
caf4b323 FW	376	unsigned long func; /* Current function */
	377	unsigned long long calltime;
	378	unsigned long long rettime;
0231022c FW	379	/* Number of functions that overran the depth limit for current task */
0231022c FW	380	unsigned long overrun;
287b6e68	381	int depth;
caf4b323 FW	382	};
caf4b323 FW	383
fb52607a	384	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
8b96f011 FW	385
	386	/*
	387	* Sometimes we don't want to trace a function with the function
	388	* graph tracer but we want them to keep traced by the usual function
	389	* tracer if the function graph tracer is not configured.
	390	*/
	391	#define __notrace_funcgraph notrace
	392
bcbc4f20 FW	393	/*
	394	* We want to which function is an entrypoint of a hardirq.
	395	* That will help us to put a signal on output.
	396	*/
	397	#define __irq_entry __attribute__((__section__(".irqentry.text")))
	398
	399	/* Limits of hardirq entrypoints */
	400	extern char __irqentry_text_start[];
	401	extern char __irqentry_text_end[];
	402
f201ae23 FW	403	#define FTRACE_RETFUNC_DEPTH 50
f201ae23 FW	404	#define FTRACE_RETSTACK_ALLOC_SIZE 32
287b6e68 FW	405	/* Type of the callback handlers for tracing function graph*/
287b6e68 FW	406	typedef void (trace_func_graph_ret_t)(struct ftrace_graph_ret ); /* return */
e49dc19c	407	typedef int (trace_func_graph_ent_t)(struct ftrace_graph_ent ); /* entry */
287b6e68 FW	408
	409	extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
	410	trace_func_graph_ent_t entryfunc);
	411
14a866c5 SR	412	extern void ftrace_graph_stop(void);
14a866c5 SR	413
287b6e68 FW	414	/* The current handlers in use */
	415	extern trace_func_graph_ret_t ftrace_graph_return;
	416	extern trace_func_graph_ent_t ftrace_graph_entry;
caf4b323	417
fb52607a	418	extern void unregister_ftrace_graph(void);
f201ae23	419
fb52607a FW	420	extern void ftrace_graph_init_task(struct task_struct *t);
fb52607a FW	421	extern void ftrace_graph_exit_task(struct task_struct *t);
21a8c466 FW	422
	423	static inline int task_curr_ret_stack(struct task_struct *t)
	424	{
	425	return t->curr_ret_stack;
	426	}
380c4b14 FW	427
	428	static inline void pause_graph_tracing(void)
	429	{
	430	atomic_inc(&current->tracing_graph_pause);
	431	}
	432
	433	static inline void unpause_graph_tracing(void)
	434	{
	435	atomic_dec(&current->tracing_graph_pause);
	436	}
82f60f0b	437	#else
8b96f011 FW	438
8b96f011 FW	439	#define __notrace_funcgraph
bcbc4f20	440	#define __irq_entry
8b96f011	441
fb52607a FW	442	static inline void ftrace_graph_init_task(struct task_struct *t) { }
fb52607a FW	443	static inline void ftrace_graph_exit_task(struct task_struct *t) { }
21a8c466 FW	444
	445	static inline int task_curr_ret_stack(struct task_struct *tsk)
	446	{
	447	return -1;
	448	}
380c4b14 FW	449
	450	static inline void pause_graph_tracing(void) { }
	451	static inline void unpause_graph_tracing(void) { }
caf4b323 FW	452	#endif
caf4b323 FW	453
ea4e2bc4 SR	454	#ifdef CONFIG_TRACING
	455	#include <linux/sched.h>
	456
	457	/* flags for current->trace */
	458	enum {
	459	TSK_TRACE_FL_TRACE_BIT = 0,
	460	TSK_TRACE_FL_GRAPH_BIT = 1,
	461	};
	462	enum {
	463	TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
	464	TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
	465	};
	466
	467	static inline void set_tsk_trace_trace(struct task_struct *tsk)
	468	{
	469	set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	470	}
	471
	472	static inline void clear_tsk_trace_trace(struct task_struct *tsk)
	473	{
	474	clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
	475	}
	476
	477	static inline int test_tsk_trace_trace(struct task_struct *tsk)
	478	{
	479	return tsk->trace & TSK_TRACE_FL_TRACE;
	480	}
	481
	482	static inline void set_tsk_trace_graph(struct task_struct *tsk)
	483	{
	484	set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	485	}
	486
	487	static inline void clear_tsk_trace_graph(struct task_struct *tsk)
	488	{
	489	clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
	490	}
	491
	492	static inline int test_tsk_trace_graph(struct task_struct *tsk)
	493	{
	494	return tsk->trace & TSK_TRACE_FL_GRAPH;
	495	}
	496
	497	#endif /* CONFIG_TRACING */
	498
16444a8a	499	#endif /* _LINUX_FTRACE_H */