selftests/ftrace: Check required filter files before running test

Without CONFIG_DYNAMIC_FTRACE, some tests get failure because required
filter files(set_ftrace_filter/available_filter_functions/stack_trace_filter)
are missing.  So implement check_filter_file() and make all related tests
check required filter files by it.

BTW: set_ftrace_filter and available_filter_functions are introduced together
so just check either of them.

Signed-off-by: Xiao Yang <[email protected]>
Acked-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: yangx-jy

tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc

@@ -10,10 +10,7 @@ if ! grep -q function_graph available_tracers; then
     exit_unsupported
 fi
 
-if [ ! -f set_ftrace_filter ]; then
-    echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
-    exit_unsupported
-fi
+check_filter_file set_ftrace_filter
 
 do_reset() {
     if [ -e /proc/sys/kernel/stack_tracer_enabled ]; then

tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter.tc

@@ -9,6 +9,8 @@ if ! grep -q function_graph available_tracers; then
     exit_unsupported
 fi
 
+check_filter_file set_ftrace_filter
+
 fail() { # msg
     echo $1
     exit_fail

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-glob.tc

@@ -9,6 +9,8 @@ if ! grep -q function available_tracers; then
     exit_unsupported
 fi
 
+check_filter_file set_ftrace_filter
+
 disable_tracing
 clear_trace
 

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc

@@ -15,10 +15,7 @@ if [ ! -f set_ftrace_notrace_pid ]; then
     exit_unsupported
 fi
 
-if [ ! -f set_ftrace_filter ]; then
-    echo "set_ftrace_filter not found? Is function tracer not set?"
-    exit_unsupported
-fi
+check_filter_file set_ftrace_filter
 
 do_function_fork=1
 

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc

@@ -16,10 +16,7 @@ if [ ! -f set_ftrace_pid ]; then
     exit_unsupported
 fi
 
-if [ ! -f set_ftrace_filter ]; then
-    echo "set_ftrace_filter not found? Is function tracer not set?"
-    exit_unsupported
-fi
+check_filter_file set_ftrace_filter
 
 do_function_fork=1
 

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc

@@ -3,7 +3,7 @@
 # description: ftrace - stacktrace filter command
 # flags: instance
 
-[ ! -f set_ftrace_filter ] && exit_unsupported
+check_filter_file set_ftrace_filter
 
 echo _do_fork:stacktrace >> set_ftrace_filter
 

tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc

@@ -11,10 +11,7 @@
 #
 
 # The triggers are set within the set_ftrace_filter file
-if [ ! -f set_ftrace_filter ]; then
-    echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
-    exit_unsupported
-fi
+check_filter_file set_ftrace_filter
 
 do_reset() {
     reset_ftrace_filter

tools/testing/selftests/ftrace/test.d/ftrace/func_mod_trace.tc

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function trace on module
 
-[ ! -f set_ftrace_filter ] && exit_unsupported
+check_filter_file set_ftrace_filter
 
 : "mod: allows to filter a non exist function"
 echo 'non_exist_func:mod:non_exist_module' > set_ftrace_filter

tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc

@@ -18,10 +18,7 @@ if ! grep -q function_graph available_tracers; then
     exit_unsupported;
 fi
 
-if [ ! -f set_ftrace_filter ]; then
-    echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
-    exit_unsupported
-fi
+check_filter_file set_ftrace_filter
 
 if [ ! -f function_profile_enabled ]; then
     echo "function_profile_enabled not found, function profiling enabled?"

tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc

@@ -10,10 +10,7 @@
 #
 
 # The triggers are set within the set_ftrace_filter file
-if [ ! -f set_ftrace_filter ]; then
-    echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
-    exit_unsupported
-fi
+check_filter_file set_ftrace_filter
 
 fail() { # mesg
     echo $1