[net-next-2.6.git] / include / linux / ftrace.h

#ifndef _LINUX_FTRACE_H
#define _LINUX_FTRACE_H

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

#include <asm/ftrace.h>

#ifdef CONFIG_FUNCTION_TRACER

extern int ftrace_enabled;
extern int
ftrace_enable_sysctl(struct ctl_table *table, int write,
		     struct file *filp, void __user *buffer, size_t *lenp,
		     loff_t *ppos);

typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);

struct ftrace_ops {
	ftrace_func_t	  func;
	struct ftrace_ops *next;
};

extern int function_trace_stop;

/*
 * Type of the current tracing.
 */
enum ftrace_tracing_type_t {
	FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
	FTRACE_TYPE_RETURN,	/* Hook the return of the function */
};

/* Current tracing type, default is FTRACE_TYPE_ENTER */
extern enum ftrace_tracing_type_t ftrace_tracing_type;

/**
 * ftrace_stop - stop function tracer.
 *
 * A quick way to stop the function tracer. Note this an on off switch,
 * it is not something that is recursive like preempt_disable.
 * This does not disable the calling of mcount, it only stops the
 * calling of functions from mcount.
 */
static inline void ftrace_stop(void)
{
	function_trace_stop = 1;
}

/**
 * ftrace_start - start the function tracer.
 *
 * This function is the inverse of ftrace_stop. This does not enable
 * the function tracing if the function tracer is disabled. This only
 * sets the function tracer flag to continue calling the functions
 * from mcount.
 */
static inline void ftrace_start(void)
{
	function_trace_stop = 0;
}

/*
 * The ftrace_ops must be a static and should also
 * be read_mostly.  These functions do modify read_mostly variables
 * so use them sparely. Never free an ftrace_op or modify the
 * next pointer after it has been registered. Even after unregistering
 * it, the next pointer may still be used internally.
 */
int register_ftrace_function(struct ftrace_ops *ops);
int unregister_ftrace_function(struct ftrace_ops *ops);
void clear_ftrace_function(void);

extern void ftrace_stub(unsigned long a0, unsigned long a1);

#else /* !CONFIG_FUNCTION_TRACER */
# define register_ftrace_function(ops) do { } while (0)
# define unregister_ftrace_function(ops) do { } while (0)
# define clear_ftrace_function(ops) do { } while (0)
static inline void ftrace_kill(void) { }
static inline void ftrace_stop(void) { }
static inline void ftrace_start(void) { }
#endif /* CONFIG_FUNCTION_TRACER */

#ifdef CONFIG_STACK_TRACER
extern int stack_tracer_enabled;
int
stack_trace_sysctl(struct ctl_table *table, int write,
		   struct file *file, void __user *buffer, size_t *lenp,
		   loff_t *ppos);
#endif

struct ftrace_func_command {
	struct list_head	list;
	char			*name;
	int			(*func)(char *func, char *cmd,
					char *params, int enable);
};

#ifdef CONFIG_DYNAMIC_FTRACE

int ftrace_arch_code_modify_prepare(void);
int ftrace_arch_code_modify_post_process(void);

struct seq_file;

struct ftrace_probe_ops {
	void			(*func)(unsigned long ip,
					unsigned long parent_ip,
					void **data);
	int			(*callback)(unsigned long ip, void **data);
	void			(*free)(void **data);
	int			(*print)(struct seq_file *m,
					 unsigned long ip,
					 struct ftrace_probe_ops *ops,
					 void *data);
};

extern int
register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
			      void *data);
extern void
unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
				void *data);
extern void
unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
extern void unregister_ftrace_function_probe_all(char *glob);

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 {
	union {
		unsigned long		ip; /* address of mcount call-site */
		struct dyn_ftrace	*freelist;
	};
	union {
		unsigned long		flags;
		struct dyn_ftrace	*newlist;
	};
	struct dyn_arch_ftrace		arch;
};

int ftrace_force_update(void);
void ftrace_set_filter(unsigned char *buf, int len, int reset);

int register_ftrace_command(struct ftrace_func_command *cmd);
int unregister_ftrace_command(struct ftrace_func_command *cmd);

/* defined in arch */
extern int ftrace_ip_converted(unsigned long ip);
extern int ftrace_dyn_arch_init(void *data);
extern int ftrace_update_ftrace_func(ftrace_func_t func);
extern void ftrace_caller(void);
extern void ftrace_call(void);
extern void mcount_call(void);

#ifndef FTRACE_ADDR
#define FTRACE_ADDR ((unsigned long)ftrace_caller)
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
extern void ftrace_graph_caller(void);
extern int ftrace_enable_ftrace_graph_caller(void);
extern int ftrace_disable_ftrace_graph_caller(void);
#else
static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
#endif

/**
 * ftrace_make_nop - convert code into nop
 * @mod: module structure if called by module load initialization
 * @rec: the mcount call site record
 * @addr: the address that the call site should be calling
 *
 * This is a very sensitive operation and great care needs
 * to be taken by the arch.  The operation should carefully
 * read the location, check to see if what is read is indeed
 * what we expect it to be, and then on success of the compare,
 * it should write to the location.
 *
 * The code segment at @rec->ip should be a caller to @addr
 *
 * Return must be:
 *  0 on success
 *  -EFAULT on error reading the location
 *  -EINVAL on a failed compare of the contents
 *  -EPERM  on error writing to the location
 * Any other value will be considered a failure.
 */
extern int ftrace_make_nop(struct module *mod,
			   struct dyn_ftrace *rec, unsigned long addr);

/**
 * ftrace_make_call - convert a nop call site into a call to addr
 * @rec: the mcount call site record
 * @addr: the address that the call site should call
 *
 * This is a very sensitive operation and great care needs
 * to be taken by the arch.  The operation should carefully
 * read the location, check to see if what is read is indeed
 * what we expect it to be, and then on success of the compare,
 * it should write to the location.
 *
 * The code segment at @rec->ip should be a nop
 *
 * Return must be:
 *  0 on success
 *  -EFAULT on error reading the location
 *  -EINVAL on a failed compare of the contents
 *  -EPERM  on error writing to the location
 * Any other value will be considered a failure.
 */
extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);

/* May be defined in arch */
extern int ftrace_arch_read_dyn_info(char *buf, int size);

extern int skip_trace(unsigned long ip);

extern void ftrace_release(void *start, unsigned long size);

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

/* totally disable ftrace - can not re-enable after this */
void ftrace_kill(void);

static inline void tracer_disable(void)
{
#ifdef CONFIG_FUNCTION_TRACER
	ftrace_enabled = 0;
#endif
}

/*
 * Ftrace disable/restore without lock. Some synchronization mechanism
 * must be used to prevent ftrace_enabled to be changed between
 * disable/restore.
 */
static inline int __ftrace_enabled_save(void)
{
#ifdef CONFIG_FUNCTION_TRACER
	int saved_ftrace_enabled = ftrace_enabled;
	ftrace_enabled = 0;
	return saved_ftrace_enabled;
#else
	return 0;
#endif
}

static inline void __ftrace_enabled_restore(int enabled)
{
#ifdef CONFIG_FUNCTION_TRACER
	ftrace_enabled = enabled;
#endif
}

#ifndef HAVE_ARCH_CALLER_ADDR
# ifdef CONFIG_FRAME_POINTER
#  define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
#  define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
#  define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
#  define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
#  define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
#  define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
#  define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
# else
#  define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
#  define CALLER_ADDR1 0UL
#  define CALLER_ADDR2 0UL
#  define CALLER_ADDR3 0UL
#  define CALLER_ADDR4 0UL
#  define CALLER_ADDR5 0UL
#  define CALLER_ADDR6 0UL
# endif
#endif /* ifndef HAVE_ARCH_CALLER_ADDR */

#ifdef CONFIG_IRQSOFF_TRACER
  extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
  extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
#else
# 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_FTRACE_MCOUNT_RECORD
extern void ftrace_init(void);
extern void ftrace_init_module(struct module *mod,
			       unsigned long *start, unsigned long *end);
#else
static inline void ftrace_init(void) { }
static inline void
ftrace_init_module(struct module *mod,
		   unsigned long *start, unsigned long *end) { }
#endif

/*
 * Structure that defines an entry function trace.
 */
struct ftrace_graph_ent {
	unsigned long func; /* Current function */
	int depth;
};

/*
 * Structure that defines a return function trace.
 */
struct ftrace_graph_ret {
	unsigned long func; /* Current function */
	unsigned long long calltime;
	unsigned long long rettime;
	/* Number of functions that overran the depth limit for current task */
	unsigned long overrun;
	int depth;
};

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

/* for init task */
#define INIT_FTRACE_GRAPH		.ret_stack = NULL,

/*
 * Stack of return addresses for functions
 * of a thread.
 * Used in struct thread_info
 */
struct ftrace_ret_stack {
	unsigned long ret;
	unsigned long func;
	unsigned long long calltime;
};

/*
 * Primary handler of a function return.
 * It relays on ftrace_return_to_handler.
 * Defined in entry_32/64.S
 */
extern void return_to_handler(void);

extern int
ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth);
extern void
ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret);

/*
 * 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 /* !CONFIG_FUNCTION_GRAPH_TRACER */

#define __notrace_funcgraph
#define __irq_entry
#define INIT_FTRACE_GRAPH

static inline void ftrace_graph_init_task(struct task_struct *t) { }
static inline void ftrace_graph_exit_task(struct task_struct *t) { }

static inline int task_curr_ret_stack(struct task_struct *tsk)
{
	return -1;
}

static inline void pause_graph_tracing(void) { }
static inline void unpause_graph_tracing(void) { }
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */

#ifdef CONFIG_TRACING
#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;
}

extern int ftrace_dump_on_oops;

#endif /* CONFIG_TRACING */


#ifdef CONFIG_HW_BRANCH_TRACER

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

#else /* CONFIG_HW_BRANCH_TRACER */

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

#endif /* CONFIG_HW_BRANCH_TRACER */

#endif /* _LINUX_FTRACE_H */
Commit	Line	Data
16444a8a ACM	1	#ifndef _LINUX_FTRACE_H
	2	#define _LINUX_FTRACE_H
	3
0012693a	4	#include <linux/trace_clock.h>
5601020f	5	#include <linux/kallsyms.h>
0012693a	6	#include <linux/linkage.h>
ea4e2bc4	7	#include <linux/bitops.h>
0012693a FW	8	#include <linux/module.h>
0012693a FW	9	#include <linux/ktime.h>
21a8c466	10	#include <linux/sched.h>
0012693a FW	11	#include <linux/types.h>
	12	#include <linux/init.h>
	13	#include <linux/fs.h>
16444a8a	14
c79a61f5 UKK	15	#include <asm/ftrace.h>
c79a61f5 UKK	16
606576ce	17	#ifdef CONFIG_FUNCTION_TRACER
3e1932ad	18
b0fc494f SR	19	extern int ftrace_enabled;
	20	extern int
	21	ftrace_enable_sysctl(struct ctl_table *table, int write,
	22	struct file filp, void __user buffer, size_t *lenp,
	23	loff_t *ppos);
	24
16444a8a ACM	25	typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
	26
	27	struct ftrace_ops {
	28	ftrace_func_t func;
	29	struct ftrace_ops *next;
	30	};
	31
60a7ecf4 SR	32	extern int function_trace_stop;
60a7ecf4 SR	33
e7d3737e FW	34	/*
	35	* Type of the current tracing.
	36	*/
	37	enum ftrace_tracing_type_t {
	38	FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
	39	FTRACE_TYPE_RETURN, /* Hook the return of the function */
	40	};
	41
	42	/* Current tracing type, default is FTRACE_TYPE_ENTER */
	43	extern enum ftrace_tracing_type_t ftrace_tracing_type;
	44
60a7ecf4 SR	45	/**
	46	* ftrace_stop - stop function tracer.
	47	*
	48	* A quick way to stop the function tracer. Note this an on off switch,
	49	* it is not something that is recursive like preempt_disable.
	50	* This does not disable the calling of mcount, it only stops the
	51	* calling of functions from mcount.
	52	*/
	53	static inline void ftrace_stop(void)
	54	{
	55	function_trace_stop = 1;
	56	}
	57
	58	/**
	59	* ftrace_start - start the function tracer.
	60	*
	61	* This function is the inverse of ftrace_stop. This does not enable
	62	* the function tracing if the function tracer is disabled. This only
	63	* sets the function tracer flag to continue calling the functions
	64	* from mcount.
	65	*/
	66	static inline void ftrace_start(void)
	67	{
	68	function_trace_stop = 0;
	69	}
	70
16444a8a ACM	71	/*
	72	* The ftrace_ops must be a static and should also
	73	* be read_mostly. These functions do modify read_mostly variables
	74	* so use them sparely. Never free an ftrace_op or modify the
	75	* next pointer after it has been registered. Even after unregistering
	76	* it, the next pointer may still be used internally.
	77	*/
	78	int register_ftrace_function(struct ftrace_ops *ops);
	79	int unregister_ftrace_function(struct ftrace_ops *ops);
	80	void clear_ftrace_function(void);
	81
	82	extern void ftrace_stub(unsigned long a0, unsigned long a1);
16444a8a	83
606576ce	84	#else /* !CONFIG_FUNCTION_TRACER */
16444a8a ACM	85	# define register_ftrace_function(ops) do { } while (0)
	86	# define unregister_ftrace_function(ops) do { } while (0)
	87	# define clear_ftrace_function(ops) do { } while (0)
81adbdc0	88	static inline void ftrace_kill(void) { }
60a7ecf4 SR	89	static inline void ftrace_stop(void) { }
60a7ecf4 SR	90	static inline void ftrace_start(void) { }
606576ce	91	#endif /* CONFIG_FUNCTION_TRACER */
352ad25a	92
f38f1d2a SR	93	#ifdef CONFIG_STACK_TRACER
	94	extern int stack_tracer_enabled;
	95	int
	96	stack_trace_sysctl(struct ctl_table *table, int write,
	97	struct file file, void __user buffer, size_t *lenp,
	98	loff_t *ppos);
	99	#endif
	100
f6180773 SR	101	struct ftrace_func_command {
	102	struct list_head list;
	103	char *name;
	104	int (func)(char func, char *cmd,
	105	char *params, int enable);
	106	};
	107
3d083395	108	#ifdef CONFIG_DYNAMIC_FTRACE
31e88909	109
000ab691 SR	110	int ftrace_arch_code_modify_prepare(void);
	111	int ftrace_arch_code_modify_post_process(void);
	112
809dcf29 SR	113	struct seq_file;
809dcf29 SR	114
b6887d79	115	struct ftrace_probe_ops {
59df055f SR	116	void (*func)(unsigned long ip,
	117	unsigned long parent_ip,
	118	void **data);
	119	int (callback)(unsigned long ip, void *data);
	120	void (free)(void *data);
809dcf29 SR	121	int (print)(struct seq_file m,
809dcf29 SR	122	unsigned long ip,
b6887d79	123	struct ftrace_probe_ops *ops,
809dcf29	124	void *data);
59df055f SR	125	};
	126
	127	extern int
b6887d79	128	register_ftrace_function_probe(char glob, struct ftrace_probe_ops ops,
59df055f SR	129	void *data);
59df055f SR	130	extern void
b6887d79	131	unregister_ftrace_function_probe(char glob, struct ftrace_probe_ops ops,
59df055f SR	132	void *data);
59df055f SR	133	extern void
b6887d79 SR	134	unregister_ftrace_function_probe_func(char glob, struct ftrace_probe_ops ops);
b6887d79 SR	135	extern void unregister_ftrace_function_probe_all(char *glob);
59df055f	136
3c1720f0	137	enum {
37ad5084 SR	138	FTRACE_FL_FREE = (1 << 0),
	139	FTRACE_FL_FAILED = (1 << 1),
	140	FTRACE_FL_FILTER = (1 << 2),
	141	FTRACE_FL_ENABLED = (1 << 3),
41c52c0d	142	FTRACE_FL_NOTRACE = (1 << 4),
0eb96701	143	FTRACE_FL_CONVERTED = (1 << 5),
ecea656d	144	FTRACE_FL_FROZEN = (1 << 6),
3c1720f0 SR	145	};
3c1720f0 SR	146
3d083395	147	struct dyn_ftrace {
ee000b7f LJ	148	union {
	149	unsigned long ip; /* address of mcount call-site */
	150	struct dyn_ftrace *freelist;
	151	};
	152	union {
	153	unsigned long flags;
	154	struct dyn_ftrace *newlist;
	155	};
	156	struct dyn_arch_ftrace arch;
3d083395 SR	157	};
3d083395 SR	158
e1c08bdd	159	int ftrace_force_update(void);
77a2b37d	160	void ftrace_set_filter(unsigned char *buf, int len, int reset);
e1c08bdd	161
f6180773 SR	162	int register_ftrace_command(struct ftrace_func_command *cmd);
	163	int unregister_ftrace_command(struct ftrace_func_command *cmd);
	164
3d083395	165	/* defined in arch */
3c1720f0	166	extern int ftrace_ip_converted(unsigned long ip);
d61f82d0	167	extern int ftrace_dyn_arch_init(void *data);
d61f82d0 SR	168	extern int ftrace_update_ftrace_func(ftrace_func_t func);
	169	extern void ftrace_caller(void);
	170	extern void ftrace_call(void);
	171	extern void mcount_call(void);
f0001207 SL	172
	173	#ifndef FTRACE_ADDR
	174	#define FTRACE_ADDR ((unsigned long)ftrace_caller)
	175	#endif
fb52607a FW	176	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
fb52607a FW	177	extern void ftrace_graph_caller(void);
5a45cfe1 SR	178	extern int ftrace_enable_ftrace_graph_caller(void);
	179	extern int ftrace_disable_ftrace_graph_caller(void);
	180	#else
	181	static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
	182	static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
e7d3737e	183	#endif
ad90c0e3	184
31e88909	185	/**
57794a9d	186	* ftrace_make_nop - convert code into nop
31e88909 SR	187	* @mod: module structure if called by module load initialization
	188	* @rec: the mcount call site record
	189	* @addr: the address that the call site should be calling
	190	*
	191	* This is a very sensitive operation and great care needs
	192	* to be taken by the arch. The operation should carefully
	193	* read the location, check to see if what is read is indeed
	194	* what we expect it to be, and then on success of the compare,
	195	* it should write to the location.
	196	*
	197	* The code segment at @rec->ip should be a caller to @addr
	198	*
	199	* Return must be:
	200	* 0 on success
	201	* -EFAULT on error reading the location
	202	* -EINVAL on a failed compare of the contents
	203	* -EPERM on error writing to the location
	204	* Any other value will be considered a failure.
	205	*/
	206	extern int ftrace_make_nop(struct module *mod,
	207	struct dyn_ftrace *rec, unsigned long addr);
a26a2a27	208
593eb8a2	209	/**
31e88909 SR	210	* ftrace_make_call - convert a nop call site into a call to addr
	211	* @rec: the mcount call site record
	212	* @addr: the address that the call site should call
593eb8a2 SR	213	*
	214	* This is a very sensitive operation and great care needs
	215	* to be taken by the arch. The operation should carefully
	216	* read the location, check to see if what is read is indeed
	217	* what we expect it to be, and then on success of the compare,
	218	* it should write to the location.
	219	*
31e88909 SR	220	* The code segment at @rec->ip should be a nop
31e88909 SR	221	*
593eb8a2 SR	222	* Return must be:
	223	* 0 on success
	224	* -EFAULT on error reading the location
	225	* -EINVAL on a failed compare of the contents
	226	* -EPERM on error writing to the location
	227	* Any other value will be considered a failure.
	228	*/
31e88909 SR	229	extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
31e88909 SR	230
31e88909 SR	231	/* May be defined in arch */
31e88909 SR	232	extern int ftrace_arch_read_dyn_info(char *buf, int size);
593eb8a2	233
ecea656d AS	234	extern int skip_trace(unsigned long ip);
ecea656d AS	235
c0719e5a SR	236	extern void ftrace_release(void *start, unsigned long size);
	237
	238	extern void ftrace_disable_daemon(void);
	239	extern void ftrace_enable_daemon(void);
e1c08bdd	240	#else
ecea656d	241	# define skip_trace(ip) ({ 0; })
aeaee8a2 IM	242	# define ftrace_force_update() ({ 0; })
aeaee8a2 IM	243	# define ftrace_set_filter(buf, len, reset) do { } while (0)
ad90c0e3 SR	244	# define ftrace_disable_daemon() do { } while (0)
ad90c0e3 SR	245	# define ftrace_enable_daemon() do { } while (0)
c0719e5a	246	static inline void ftrace_release(void *start, unsigned long size) { }
f6180773 SR	247	static inline int register_ftrace_command(struct ftrace_func_command *cmd)
f6180773 SR	248	{
97d0bb8d	249	return -EINVAL;
f6180773 SR	250	}
	251	static inline int unregister_ftrace_command(char *cmd_name)
	252	{
97d0bb8d	253	return -EINVAL;
f6180773	254	}
ecea656d	255	#endif /* CONFIG_DYNAMIC_FTRACE */
352ad25a	256
aeaee8a2 IM	257	/* totally disable ftrace - can not re-enable after this */
	258	void ftrace_kill(void);
	259
f43fdad8 IM	260	static inline void tracer_disable(void)
f43fdad8 IM	261	{
606576ce	262	#ifdef CONFIG_FUNCTION_TRACER
f43fdad8 IM	263	ftrace_enabled = 0;
	264	#endif
	265	}
	266
37002735 HY	267	/*
37002735 HY	268	* Ftrace disable/restore without lock. Some synchronization mechanism
9bdeb7b5	269	* must be used to prevent ftrace_enabled to be changed between
37002735 HY	270	* disable/restore.
37002735 HY	271	*/
9bdeb7b5 HY	272	static inline int __ftrace_enabled_save(void)
9bdeb7b5 HY	273	{
606576ce	274	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	275	int saved_ftrace_enabled = ftrace_enabled;
	276	ftrace_enabled = 0;
	277	return saved_ftrace_enabled;
	278	#else
	279	return 0;
	280	#endif
	281	}
	282
	283	static inline void __ftrace_enabled_restore(int enabled)
	284	{
606576ce	285	#ifdef CONFIG_FUNCTION_TRACER
9bdeb7b5 HY	286	ftrace_enabled = enabled;
	287	#endif
	288	}
	289
c79a61f5 UKK	290	#ifndef HAVE_ARCH_CALLER_ADDR
	291	# ifdef CONFIG_FRAME_POINTER
	292	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	293	# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
	294	# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
	295	# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
	296	# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
	297	# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
	298	# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
	299	# else
	300	# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
	301	# define CALLER_ADDR1 0UL
	302	# define CALLER_ADDR2 0UL
	303	# define CALLER_ADDR3 0UL
	304	# define CALLER_ADDR4 0UL
	305	# define CALLER_ADDR5 0UL
	306	# define CALLER_ADDR6 0UL
	307	# endif
	308	#endif /* ifndef HAVE_ARCH_CALLER_ADDR */
352ad25a	309
81d68a96	310	#ifdef CONFIG_IRQSOFF_TRACER
489f1396 IM	311	extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
489f1396 IM	312	extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
81d68a96 SR	313	#else
	314	# define time_hardirqs_on(a0, a1) do { } while (0)
	315	# define time_hardirqs_off(a0, a1) do { } while (0)
	316	#endif
	317
6cd8a4bb	318	#ifdef CONFIG_PREEMPT_TRACER
489f1396 IM	319	extern void trace_preempt_on(unsigned long a0, unsigned long a1);
489f1396 IM	320	extern void trace_preempt_off(unsigned long a0, unsigned long a1);
6cd8a4bb SR	321	#else
	322	# define trace_preempt_on(a0, a1) do { } while (0)
	323	# define trace_preempt_off(a0, a1) do { } while (0)
	324	#endif
	325
68bf21aa SR	326	#ifdef CONFIG_FTRACE_MCOUNT_RECORD
68bf21aa SR	327	extern void ftrace_init(void);
31e88909 SR	328	extern void ftrace_init_module(struct module *mod,
31e88909 SR	329	unsigned long start, unsigned long end);
68bf21aa SR	330	#else
68bf21aa SR	331	static inline void ftrace_init(void) { }
90d595fe	332	static inline void
31e88909 SR	333	ftrace_init_module(struct module *mod,
31e88909 SR	334	unsigned long start, unsigned long end) { }
68bf21aa SR	335	#endif
68bf21aa SR	336
287b6e68 FW	337	/*
	338	* Structure that defines an entry function trace.
	339	*/
	340	struct ftrace_graph_ent {
	341	unsigned long func; /* Current function */
	342	int depth;
	343	};
dd0e545f	344
caf4b323 FW	345	/*
	346	* Structure that defines a return function trace.
	347	*/
fb52607a	348	struct ftrace_graph_ret {
caf4b323 FW	349	unsigned long func; /* Current function */
	350	unsigned long long calltime;
	351	unsigned long long rettime;
0231022c FW	352	/* Number of functions that overran the depth limit for current task */
0231022c FW	353	unsigned long overrun;
287b6e68	354	int depth;
caf4b323 FW	355	};
caf4b323 FW	356
fb52607a	357	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
8b96f011	358
5ac9f622	359	/* for init task */
f876d346	360	#define INIT_FTRACE_GRAPH .ret_stack = NULL,
5ac9f622	361
712406a6 SR	362	/*
	363	* Stack of return addresses for functions
	364	* of a thread.
	365	* Used in struct thread_info
	366	*/
	367	struct ftrace_ret_stack {
	368	unsigned long ret;
	369	unsigned long func;
	370	unsigned long long calltime;
	371	};
	372
	373	/*
	374	* Primary handler of a function return.
	375	* It relays on ftrace_return_to_handler.
	376	* Defined in entry_32/64.S
	377	*/
	378	extern void return_to_handler(void);
	379
	380	extern int
5d1a03dc	381	ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth);
712406a6 SR	382	extern void
	383	ftrace_pop_return_trace(struct ftrace_graph_ret trace, unsigned long ret);
	384
8b96f011 FW	385	/*
	386	* Sometimes we don't want to trace a function with the function
	387	* graph tracer but we want them to keep traced by the usual function
	388	* tracer if the function graph tracer is not configured.
	389	*/
	390	#define __notrace_funcgraph notrace
	391
bcbc4f20 FW	392	/*
	393	* We want to which function is an entrypoint of a hardirq.
	394	* That will help us to put a signal on output.
	395	*/
	396	#define __irq_entry __attribute__((__section__(".irqentry.text")))
	397
	398	/* Limits of hardirq entrypoints */
	399	extern char __irqentry_text_start[];
	400	extern char __irqentry_text_end[];
	401
f201ae23 FW	402	#define FTRACE_RETFUNC_DEPTH 50
f201ae23 FW	403	#define FTRACE_RETSTACK_ALLOC_SIZE 32
287b6e68 FW	404	/* Type of the callback handlers for tracing function graph*/
287b6e68 FW	405	typedef void (trace_func_graph_ret_t)(struct ftrace_graph_ret ); /* return */
e49dc19c	406	typedef int (trace_func_graph_ent_t)(struct ftrace_graph_ent ); /* entry */
287b6e68 FW	407
	408	extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
	409	trace_func_graph_ent_t entryfunc);
	410
14a866c5 SR	411	extern void ftrace_graph_stop(void);
14a866c5 SR	412
287b6e68 FW	413	/* The current handlers in use */
	414	extern trace_func_graph_ret_t ftrace_graph_return;
	415	extern trace_func_graph_ent_t ftrace_graph_entry;
caf4b323	416
fb52607a	417	extern void unregister_ftrace_graph(void);
f201ae23	418
fb52607a FW	419	extern void ftrace_graph_init_task(struct task_struct *t);
fb52607a FW	420	extern void ftrace_graph_exit_task(struct task_struct *t);
21a8c466 FW	421
	422	static inline int task_curr_ret_stack(struct task_struct *t)
	423	{
	424	return t->curr_ret_stack;
	425	}
380c4b14 FW	426
	427	static inline void pause_graph_tracing(void)
	428	{
	429	atomic_inc(&current->tracing_graph_pause);
	430	}
	431
	432	static inline void unpause_graph_tracing(void)
	433	{
	434	atomic_dec(&current->tracing_graph_pause);
	435	}
5ac9f622	436	#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
8b96f011 FW	437
8b96f011 FW	438	#define __notrace_funcgraph
bcbc4f20	439	#define __irq_entry
5ac9f622	440	#define INIT_FTRACE_GRAPH
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) { }
5ac9f622	452	#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
caf4b323	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
526211bc IM	497	extern int ftrace_dump_on_oops;
526211bc IM	498
ea4e2bc4 SR	499	#endif /* CONFIG_TRACING */
ea4e2bc4 SR	500
b1818748 MM	501
	502	#ifdef CONFIG_HW_BRANCH_TRACER
	503
	504	void trace_hw_branch(u64 from, u64 to);
	505	void trace_hw_branch_oops(void);
	506
	507	#else /* CONFIG_HW_BRANCH_TRACER */
	508
	509	static inline void trace_hw_branch(u64 from, u64 to) {}
	510	static inline void trace_hw_branch_oops(void) {}
	511
	512	#endif /* CONFIG_HW_BRANCH_TRACER */
	513
16444a8a	514	#endif /* _LINUX_FTRACE_H */