trace_events_filter.c File Reference

#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/mutex.h>
#include <linux/perf_event.h>
#include <linux/slab.h>
#include "trace.h"
#include "trace_output.h"

Go to the source code of this file.

Data Structures
struct	filter_op
struct	opstack_op
struct	postfix_elt
struct	filter_parse_state
struct	pred_stack
struct	filter_match_preds_data
struct	check_pred_data
struct	fold_pred_data
struct	filter_list

Macros
#define	DEFAULT_SYS_FILTER_MESSAGE
#define	DEFINE_COMPARISON_PRED(type)
#define	DEFINE_EQUALITY_PRED(size)

Typedefs
typedef int(*	filter_pred_walkcb_t )(enum move_type move, struct filter_pred *pred, int *err, void *data)

Enumerations
enum	filter_op_ids {   OP_OR, OP_AND, OP_GLOB, OP_NE,   OP_EQ, OP_LT, OP_LE, OP_GT,   OP_GE, OP_NONE, OP_OPEN_PAREN }
enum	{   FILT_ERR_NONE, FILT_ERR_INVALID_OP, FILT_ERR_UNBALANCED_PAREN, FILT_ERR_TOO_MANY_OPERANDS,   FILT_ERR_OPERAND_TOO_LONG, FILT_ERR_FIELD_NOT_FOUND, FILT_ERR_ILLEGAL_FIELD_OP, FILT_ERR_ILLEGAL_INTVAL,   FILT_ERR_BAD_SUBSYS_FILTER, FILT_ERR_TOO_MANY_PREDS, FILT_ERR_MISSING_FIELD, FILT_ERR_INVALID_FILTER,   FILT_ERR_IP_FIELD_ONLY }
enum	move_type {   MOVE_DOWN, MOVE_UP_FROM_LEFT, MOVE_UP_FROM_RIGHT, MOVE_CHARGE_TYPE_ANON,   MOVE_CHARGE_TYPE_FILE, NR_MOVE_TYPE }
enum	walk_return { WALK_PRED_ABORT, WALK_PRED_PARENT, WALK_PRED_DEFAULT }

Functions
	DEFINE_COMPARISON_PRED (s64)
	DEFINE_COMPARISON_PRED (u64)
	DEFINE_COMPARISON_PRED (s32)
	DEFINE_COMPARISON_PRED (u32)
	DEFINE_COMPARISON_PRED (s16)
	DEFINE_COMPARISON_PRED (u16)
	DEFINE_COMPARISON_PRED (s8)
	DEFINE_COMPARISON_PRED (u8)
	DEFINE_EQUALITY_PRED (64)
	DEFINE_EQUALITY_PRED (32)
	DEFINE_EQUALITY_PRED (16)
	DEFINE_EQUALITY_PRED (8)
enum regex_type	filter_parse_regex (char *buff, int len, char **search, int *not)
int	filter_match_preds (struct event_filter *filter, void *rec)
	EXPORT_SYMBOL_GPL (filter_match_preds)
void	print_event_filter (struct ftrace_event_call *call, struct trace_seq *s)
void	print_subsystem_event_filter (struct event_subsystem *system, struct trace_seq *s)
void	destroy_preds (struct ftrace_event_call *call)
int	filter_assign_type (const char *type)
int	apply_event_filter (struct ftrace_event_call *call, char *filter_string)
int	apply_subsystem_event_filter (struct event_subsystem *system, char *filter_string)

Macro Definition Documentation

#define DEFAULT_SYS_FILTER_MESSAGE

Value:

"### global filter ###\n"                   \
    "# Use this to set filters for multiple events.\n"      \
    "# Only events with the given fields will be affected.\n"   \
    "# If no events are modified, an error message will be displayed here"

Definition at line 30 of file trace_events_filter.c.

#define DEFINE_COMPARISON_PRED

(

type

)

Value:

static int filter_pred_##type(struct filter_pred *pred, void *event)    \
{                                   \
	type *addr = (type *)(event + pred->offset);           \
	type val = (type)pred->val;                    \
    int match = 0;                          \
                                    \
    switch (pred->op) {                     \
    case OP_LT:                         \
        match = (*addr < val);                  \
        break;                          \
    case OP_LE:                         \
        match = (*addr <= val);                 \
        break;                          \
    case OP_GT:                         \
        match = (*addr > val);                  \
        break;                          \
    case OP_GE:                         \
        match = (*addr >= val);                 \
        break;                          \
    default:                            \
        break;                          \
    }                               \
                                    \
    return match;                           \
}

Definition at line 139 of file trace_events_filter.c.

#define DEFINE_EQUALITY_PRED

(

size

)

Value:

static int filter_pred_##size(struct filter_pred *pred, void *event)    \
{                                   \
    u##size *addr = (u##size *)(event + pred->offset);      \
    u##size val = (u##size)pred->val;               \
    int match;                          \
                                    \
    match = (val == *addr) ^ pred->not;             \
                                    \
    return match;                           \
}

Definition at line 166 of file trace_events_filter.c.

Typedef Documentation

typedef int(* filter_pred_walkcb_t)(enum move_type move, struct filter_pred *pred, int *err, void *data)

Definition at line 398 of file trace_events_filter.c.

Enumeration Type Documentation

anonymous enum

Enumerator:

FILT_ERR_NONE
FILT_ERR_INVALID_OP
FILT_ERR_UNBALANCED_PAREN
FILT_ERR_TOO_MANY_OPERANDS
FILT_ERR_OPERAND_TOO_LONG
FILT_ERR_FIELD_NOT_FOUND
FILT_ERR_ILLEGAL_FIELD_OP
FILT_ERR_ILLEGAL_INTVAL
FILT_ERR_BAD_SUBSYS_FILTER
FILT_ERR_TOO_MANY_PREDS
FILT_ERR_MISSING_FIELD
FILT_ERR_INVALID_FILTER
FILT_ERR_IP_FIELD_ONLY

Definition at line 71 of file trace_events_filter.c.

enum filter_op_ids

Enumerator:

OP_OR
OP_AND
OP_GLOB
OP_NE
OP_EQ
OP_LT
OP_LE
OP_GT
OP_GE
OP_NONE
OP_OPEN_PAREN

Definition at line 36 of file trace_events_filter.c.

enum move_type

Enumerator:

MOVE_DOWN
MOVE_UP_FROM_LEFT
MOVE_UP_FROM_RIGHT
MOVE_CHARGE_TYPE_ANON
MOVE_CHARGE_TYPE_FILE
NR_MOVE_TYPE

Definition at line 373 of file trace_events_filter.c.

enum walk_return

Enumerator:

WALK_PRED_ABORT
WALK_PRED_PARENT
WALK_PRED_DEFAULT

Definition at line 392 of file trace_events_filter.c.

Function Documentation

int apply_event_filter	(	struct ftrace_event_call *	call,
		char *	filter_string
	)

Definition at line 1861 of file trace_events_filter.c.

int apply_subsystem_event_filter	(	struct event_subsystem *	system,
		char *	filter_string
	)

Definition at line 1910 of file trace_events_filter.c.

DEFINE_COMPARISON_PRED

(

s64

)

DEFINE_COMPARISON_PRED

(

u64

)

DEFINE_COMPARISON_PRED

(

s32

)

DEFINE_COMPARISON_PRED

(

u32

)

DEFINE_COMPARISON_PRED

(

s16

)

DEFINE_COMPARISON_PRED

(

u16

)

DEFINE_COMPARISON_PRED

(

s8

)

DEFINE_COMPARISON_PRED

(

u8

)

DEFINE_EQUALITY_PRED

(

64

)

DEFINE_EQUALITY_PRED

(

32

)

DEFINE_EQUALITY_PRED

(

16

)

DEFINE_EQUALITY_PRED

(

8

)

void destroy_preds

(

struct ftrace_event_call *

call

)

Definition at line 809 of file trace_events_filter.c.

EXPORT_SYMBOL_GPL

(

filter_match_preds

)

int filter_assign_type

(

const char *

type

)

Definition at line 893 of file trace_events_filter.c.

int filter_match_preds	(	struct event_filter *	filter,
		void *	rec
	)

Definition at line 533 of file trace_events_filter.c.

enum regex_type filter_parse_regex	(	char *	buff,
		int	len,
		char **	search,
		int *	not
	)

filter_parse_regex - parse a basic regex : the raw regex : length of the regex : will point to the beginning of the string to compare : tell whether the match will have to be inverted

This passes in a buffer containing a regex and this function will set search to point to the search part of the buffer and return the type of search it is (see enum above). This does modify buff.

Returns enum type. search returns the pointer to use for comparison. not returns 1 if buff started with a '!' 0 otherwise.

Definition at line 309 of file trace_events_filter.c.

void print_event_filter	(	struct ftrace_event_call *	call,
		struct trace_seq *	s
	)

Definition at line 634 of file trace_events_filter.c.

void print_subsystem_event_filter	(	struct event_subsystem *	system,
		struct trace_seq *	s
	)

Definition at line 647 of file trace_events_filter.c.