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Commit 2f5f6ad9 authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
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ftrace: Pass ftrace_ops as third parameter to function trace callback 

Currently the function trace callback receives only the ip and parent_ip
of the function that it traced. It would be more powerful to also return
the ops that registered the function as well. This allows the same function
to act differently depending on what ftrace_ops registered it.

Link: http://lkml.kernel.org/r/20120612225424.267254552@goodmis.org



Reviewed-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 6e0f17be

arch/x86/include/asm/ftrace.h

+4 −0
Original line number Diff line number Diff line
@@ -32,6 +32,10 @@ 
#define MCOUNT_ADDR		((long)(mcount))

#define MCOUNT_INSN_SIZE	5 /* sizeof mcount call */



#if defined(CONFIG_DYNAMIC_FTRACE) && defined(CONFIG_X86_64)

#define ARCH_SUPPORTS_FTRACE_OPS 1

#endif



#ifndef __ASSEMBLY__

extern void mcount(void);

extern atomic_t modifying_ftrace_code;

arch/x86/kernel/entry_64.S

+1 −0
Original line number Diff line number Diff line
@@ -79,6 +79,7 @@ ENTRY(ftrace_caller) 


	MCOUNT_SAVE_FRAME



	leaq function_trace_op, %rdx

	movq 0x38(%rsp), %rdi

	movq 8(%rbp), %rsi

	subq $MCOUNT_INSN_SIZE, %rdi

include/linux/ftrace.h

+14 −2
Original line number Diff line number Diff line
@@ -18,6 +18,15 @@ 


#include <asm/ftrace.h>



/*

 * If the arch supports passing the variable contents of

 * function_trace_op as the third parameter back from the

 * mcount call, then the arch should define this as 1.

 */

#ifndef ARCH_SUPPORTS_FTRACE_OPS

#define ARCH_SUPPORTS_FTRACE_OPS 0

#endif



struct module;

struct ftrace_hash;
@@ -29,7 +38,10 @@ ftrace_enable_sysctl(struct ctl_table *table, int write, 
		     void __user *buffer, size_t *lenp,

		     loff_t *ppos);



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

struct ftrace_ops;



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

			      struct ftrace_ops *op);



/*

 * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are
@@ -163,7 +175,7 @@ static inline int ftrace_function_local_disabled(struct ftrace_ops *ops) 
	return *this_cpu_ptr(ops->disabled);

}



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

extern void ftrace_stub(unsigned long a0, unsigned long a1, struct ftrace_ops *op);



#else /* !CONFIG_FUNCTION_TRACER */

/*

kernel/trace/ftrace.c

+70 −31
Original line number Diff line number Diff line
@@ -64,12 +64,19 @@ 


#define FL_GLOBAL_CONTROL_MASK (FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_CONTROL)



static struct ftrace_ops ftrace_list_end __read_mostly = {

	.func		= ftrace_stub,

};



/* ftrace_enabled is a method to turn ftrace on or off */

int ftrace_enabled __read_mostly;

static int last_ftrace_enabled;



/* Quick disabling of function tracer. */

int function_trace_stop;

int function_trace_stop __read_mostly;



/* Current function tracing op */

struct ftrace_ops *function_trace_op __read_mostly = &ftrace_list_end;



/* List for set_ftrace_pid's pids. */

LIST_HEAD(ftrace_pids);
@@ -86,10 +93,6 @@ static int ftrace_disabled __read_mostly; 


static DEFINE_MUTEX(ftrace_lock);



static struct ftrace_ops ftrace_list_end __read_mostly = {

	.func		= ftrace_stub,

};



static struct ftrace_ops *ftrace_global_list __read_mostly = &ftrace_list_end;

static struct ftrace_ops *ftrace_control_list __read_mostly = &ftrace_list_end;

static struct ftrace_ops *ftrace_ops_list __read_mostly = &ftrace_list_end;
@@ -100,8 +103,14 @@ ftrace_func_t ftrace_pid_function __read_mostly = ftrace_stub; 
static struct ftrace_ops global_ops;

static struct ftrace_ops control_ops;



static void

ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip);

#if ARCH_SUPPORTS_FTRACE_OPS

static void ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,

				 struct ftrace_ops *op);

#else

/* See comment below, where ftrace_ops_list_func is defined */

static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip);

#define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops)

#endif



/*

 * Traverse the ftrace_global_list, invoking all entries.  The reason that we
@@ -112,29 +121,29 @@ ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip); 
 *

 * Silly Alpha and silly pointer-speculation compiler optimizations!

 */

static void ftrace_global_list_func(unsigned long ip,

				    unsigned long parent_ip)

static void

ftrace_global_list_func(unsigned long ip, unsigned long parent_ip,

			struct ftrace_ops *op)

{

	struct ftrace_ops *op;



	if (unlikely(trace_recursion_test(TRACE_GLOBAL_BIT)))

		return;



	trace_recursion_set(TRACE_GLOBAL_BIT);

	op = rcu_dereference_raw(ftrace_global_list); /*see above*/

	while (op != &ftrace_list_end) {

		op->func(ip, parent_ip);

		op->func(ip, parent_ip, op);

		op = rcu_dereference_raw(op->next); /*see above*/

	};

	trace_recursion_clear(TRACE_GLOBAL_BIT);

}



static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip)

static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip,

			    struct ftrace_ops *op)

{

	if (!test_tsk_trace_trace(current))

		return;



	ftrace_pid_function(ip, parent_ip);

	ftrace_pid_function(ip, parent_ip, op);

}



static void set_ftrace_pid_function(ftrace_func_t func)
@@ -163,12 +172,13 @@ void clear_ftrace_function(void) 
 * For those archs that do not test ftrace_trace_stop in their

 * mcount call site, we need to do it from C.

 */

static void ftrace_test_stop_func(unsigned long ip, unsigned long parent_ip)

static void ftrace_test_stop_func(unsigned long ip, unsigned long parent_ip,

				  struct ftrace_ops *op)

{

	if (function_trace_stop)

		return;



	__ftrace_trace_function(ip, parent_ip);

	__ftrace_trace_function(ip, parent_ip, op);

}

#endif
@@ -230,15 +240,24 @@ static void update_ftrace_function(void) 


	/*

	 * If we are at the end of the list and this ops is

	 * not dynamic, then have the mcount trampoline call

	 * the function directly

	 * not dynamic and the arch supports passing ops, then have the

	 * mcount trampoline call the function directly.

	 */

	if (ftrace_ops_list == &ftrace_list_end ||

	    (ftrace_ops_list->next == &ftrace_list_end &&

	     !(ftrace_ops_list->flags & FTRACE_OPS_FL_DYNAMIC)))

		func = ftrace_ops_list->func;

	     !(ftrace_ops_list->flags & FTRACE_OPS_FL_DYNAMIC) &&

	     ARCH_SUPPORTS_FTRACE_OPS)) {

		/* Set the ftrace_ops that the arch callback uses */

		if (ftrace_ops_list == &global_ops)

			function_trace_op = ftrace_global_list;

		else

			function_trace_op = ftrace_ops_list;

		func = ftrace_ops_list->func;

	} else {

		/* Just use the default ftrace_ops */

		function_trace_op = &ftrace_list_end;

		func = ftrace_ops_list_func;

	}



#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST

	ftrace_trace_function = func;
@@ -773,7 +792,8 @@ ftrace_profile_alloc(struct ftrace_profile_stat *stat, unsigned long ip) 
}



static void

function_profile_call(unsigned long ip, unsigned long parent_ip)

function_profile_call(unsigned long ip, unsigned long parent_ip,

		      struct ftrace_ops *ops)

{

	struct ftrace_profile_stat *stat;

	struct ftrace_profile *rec;
@@ -803,7 +823,7 @@ function_profile_call(unsigned long ip, unsigned long parent_ip) 
#ifdef CONFIG_FUNCTION_GRAPH_TRACER

static int profile_graph_entry(struct ftrace_graph_ent *trace)

{

	function_profile_call(trace->func, 0);

	function_profile_call(trace->func, 0, NULL);

	return 1;

}
@@ -2790,8 +2810,8 @@ static int __init ftrace_mod_cmd_init(void) 
}

device_initcall(ftrace_mod_cmd_init);



static void

function_trace_probe_call(unsigned long ip, unsigned long parent_ip)

static void function_trace_probe_call(unsigned long ip, unsigned long parent_ip,

				      struct ftrace_ops *op)

{

	struct ftrace_func_probe *entry;

	struct hlist_head *hhd;
@@ -3942,10 +3962,9 @@ ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip) 
#endif /* CONFIG_DYNAMIC_FTRACE */



static void

ftrace_ops_control_func(unsigned long ip, unsigned long parent_ip)

ftrace_ops_control_func(unsigned long ip, unsigned long parent_ip,

			struct ftrace_ops *op)

{

	struct ftrace_ops *op;



	if (unlikely(trace_recursion_test(TRACE_CONTROL_BIT)))

		return;
@@ -3959,7 +3978,7 @@ ftrace_ops_control_func(unsigned long ip, unsigned long parent_ip) 
	while (op != &ftrace_list_end) {

		if (!ftrace_function_local_disabled(op) &&

		    ftrace_ops_test(op, ip))

			op->func(ip, parent_ip);

			op->func(ip, parent_ip, op);



		op = rcu_dereference_raw(op->next);

	};
@@ -3971,8 +3990,9 @@ static struct ftrace_ops control_ops = { 
	.func = ftrace_ops_control_func,

};



static void

ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip)

static inline void

__ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,

		       struct ftrace_ops *ignored)

{

	struct ftrace_ops *op;
@@ -3988,13 +4008,32 @@ ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip) 
	op = rcu_dereference_raw(ftrace_ops_list);

	while (op != &ftrace_list_end) {

		if (ftrace_ops_test(op, ip))

			op->func(ip, parent_ip);

			op->func(ip, parent_ip, op);

		op = rcu_dereference_raw(op->next);

	};

	preempt_enable_notrace();

	trace_recursion_clear(TRACE_INTERNAL_BIT);

}



/*

 * Some archs only support passing ip and parent_ip. Even though

 * the list function ignores the op parameter, we do not want any

 * C side effects, where a function is called without the caller

 * sending a third parameter.

 */

#if ARCH_SUPPORTS_FTRACE_OPS

static void ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,

				 struct ftrace_ops *op)

{

	__ftrace_ops_list_func(ip, parent_ip, NULL);

}

#else

static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip)

{

	__ftrace_ops_list_func(ip, parent_ip, NULL);

}

#endif



static void clear_ftrace_swapper(void)

{

	struct task_struct *p;

kernel/trace/trace_event_perf.c

+2 −1
Original line number Diff line number Diff line
@@ -258,7 +258,8 @@ EXPORT_SYMBOL_GPL(perf_trace_buf_prepare); 


#ifdef CONFIG_FUNCTION_TRACER

static void

perf_ftrace_function_call(unsigned long ip, unsigned long parent_ip)

perf_ftrace_function_call(unsigned long ip, unsigned long parent_ip,

			  struct ftrace_ops *ops)

{

	struct ftrace_entry *entry;

	struct hlist_head *head;