1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3# description: ftrace - function graph filters
4# requires: set_ftrace_filter function_graph:tracer
5
6# Make sure that function graph filtering works
7
8INSTANCE1="instances/test1_$$"
9INSTANCE2="instances/test2_$$"
10INSTANCE3="instances/test3_$$"
11
12WD=`pwd`
13
14do_reset() {
15    cd $WD
16    if [ -d $INSTANCE1 ]; then
17	echo nop > $INSTANCE1/current_tracer
18	rmdir $INSTANCE1
19    fi
20    if [ -d $INSTANCE2 ]; then
21	echo nop > $INSTANCE2/current_tracer
22	rmdir $INSTANCE2
23    fi
24    if [ -d $INSTANCE3 ]; then
25	echo nop > $INSTANCE3/current_tracer
26	rmdir $INSTANCE3
27    fi
28}
29
30mkdir $INSTANCE1
31if ! grep -q function_graph $INSTANCE1/available_tracers; then
32    echo "function_graph not allowed with instances"
33    rmdir $INSTANCE1
34    exit_unsupported
35fi
36
37mkdir $INSTANCE2
38mkdir $INSTANCE3
39
40fail() { # msg
41    do_reset
42    echo $1
43    exit_fail
44}
45
46disable_tracing
47clear_trace
48
49do_test() {
50    REGEX=$1
51    TEST=$2
52
53    # filter something, schedule is always good
54    if ! echo "$REGEX" > set_ftrace_filter; then
55	fail "can not enable filter $REGEX"
56    fi
57
58    echo > trace
59    echo function_graph > current_tracer
60    enable_tracing
61    sleep 1
62    # search for functions (has "{" or ";" on the line)
63    echo 0 > tracing_on
64    count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep -v "$TEST" | wc -l`
65    echo 1 > tracing_on
66    if [ $count -ne 0 ]; then
67	fail "Graph filtering not working by itself against $TEST?"
68    fi
69
70    # Make sure we did find something
71    echo 0 > tracing_on
72    count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep "$TEST" | wc -l`
73    echo 1 > tracing_on
74    if [ $count -eq 0 ]; then
75	fail "No traces found with $TEST?"
76    fi
77}
78
79do_test '*sched*' 'sched'
80cd $INSTANCE1
81do_test '*lock*' 'lock'
82cd $WD
83cd $INSTANCE2
84do_test '*rcu*' 'rcu'
85cd $WD
86cd $INSTANCE3
87echo function_graph > current_tracer
88
89sleep 1
90count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep "$TEST" | wc -l`
91if [ $count -eq 0 ]; then
92    fail "No traces found with all tracing?"
93fi
94
95cd $WD
96echo nop > current_tracer
97echo nop > $INSTANCE1/current_tracer
98echo nop > $INSTANCE2/current_tracer
99echo nop > $INSTANCE3/current_tracer
100
101do_reset
102
103exit 0
104