selftests/ftrace: Convert required interface checks into requires list

Convert the required tracefs interface checking code with
requires: list.

Fixed merge conflicts in trigger-hist.tc and trigger-trace-marker-hist.tc
Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/ftrace/test.d/00basic/snapshot.tc

 #!/bin/sh
 # description: Snapshot and tracing setting
+# requires: snapshot
 # flags: instance
 
-[ ! -f snapshot ] && exit_unsupported
-
 echo "Set tracing off"
 echo 0 > tracing_on
 

tools/testing/selftests/ftrace/test.d/00basic/trace_pipe.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: trace_pipe and trace_marker
+# requires: trace_marker
 # flags: instance
 
-[ ! -f trace_marker ] && exit_unsupported
-
 echo "test input 1" > trace_marker
 
 : "trace interface never consume the ring buffer"

tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Test ftrace direct functions against kprobes
+# requires: kprobe_events
 
 rmmod ftrace-direct ||:
 if ! modprobe ftrace-direct ; then
@@ -8,11 +9,6 @@ if ! modprobe ftrace-direct ; then
   exit_unresolved;
 fi
 
-if [ ! -f kprobe_events ]; then
-	echo "No kprobe_events file -please build CONFIG_KPROBE_EVENTS"
-	exit_unsupported;
-fi
-
 echo "Let the module run a little"
 sleep 1
 

tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Generic dynamic event - add/remove kprobe events
-
-[ -f dynamic_events ] || exit_unsupported
+# requires: dynamic_events
 
 grep -q "place: \[<module>:\]<symbol>" README || exit_unsupported
 grep -q "place (kretprobe): \[<module>:\]<symbol>" README || exit_unsupported

tools/testing/selftests/ftrace/test.d/dynevent/add_remove_synth.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Generic dynamic event - add/remove synthetic events
-
-[ -f dynamic_events ] || exit_unsupported
+# requires: dynamic_events
 
 grep -q "s:\[synthetic/\]" README || exit_unsupported
 

tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Generic dynamic event - selective clear (compatibility)
-
-[ -f dynamic_events ] || exit_unsupported
+# requires: dynamic_events kprobe_events synthetic_events
 
 grep -q "place: \[<module>:\]<symbol>" README || exit_unsupported
 grep -q "place (kretprobe): \[<module>:\]<symbol>" README || exit_unsupported
 
 grep -q "s:\[synthetic/\]" README || exit_unsupported
 
-[ -f synthetic_events ] || exit_unsupported
-[ -f kprobe_events ] || exit_unsupported
-
 echo 0 > events/enable
 echo > dynamic_events
 

tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Generic dynamic event - generic clear event
-
-[ -f dynamic_events ] || exit_unsupported
+# requires: dynamic_events
 
 grep -q "place: \[<module>:\]<symbol>" README || exit_unsupported
 grep -q "place (kretprobe): \[<module>:\]<symbol>" README || exit_unsupported

tools/testing/selftests/ftrace/test.d/event/event-enable.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event tracing - enable/disable with event level files
+# requires: set_event events/sched
 # flags: instance
 
 do_reset() {
@@ -13,11 +14,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
 echo 'sched:sched_switch' > set_event
 
 yield

tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event tracing - restricts events based on pid notrace filtering
+# requires: set_event events/sched set_event_pid set_event_notrace_pid
 # flags: instance
 
 do_reset() {
@@ -56,16 +57,6 @@ enable_events() {
     echo 1 > tracing_on
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f set_event_pid -o ! -f set_event_notrace_pid ]; then
-    echo "event pid notrace filtering is not supported"
-    exit_unsupported
-fi
-
 echo 0 > options/event-fork
 
 do_reset

tools/testing/selftests/ftrace/test.d/event/event-pid.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event tracing - restricts events based on pid
+# requires: set_event set_event_pid events/sched
 # flags: instance
 
 do_reset() {
@@ -16,16 +17,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f set_event_pid ]; then
-    echo "event pid filtering is not supported"
-    exit_unsupported
-fi
-
 echo 0 > options/event-fork
 
 echo 1 > events/sched/sched_switch/enable

tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event tracing - enable/disable with subsystem level files
+# requires: set_event events/sched/enable
 # flags: instance
 
 do_reset() {
@@ -13,11 +14,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
 echo 'sched:*' > set_event
 
 yield

tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event tracing - enable/disable with top level files
+# requires: available_events set_event events/enable
 
 do_reset() {
     echo > set_event
@@ -12,11 +13,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f available_events -o ! -f set_event -o ! -d events ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
 echo '*:*' > set_event
 
 yield

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

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function graph filters with stack tracer
+# requires: stack_trace
 
 # Make sure that function graph filtering works, and is not
 # affected by other tracers enabled (like stack tracer)
@@ -37,12 +38,6 @@ fi
 
 echo function_graph > current_tracer
 
-if [ ! -f stack_trace ]; then
-    echo "Stack tracer not configured"
-    do_reset
-    exit_unsupported;
-fi
-
 echo "Now testing with stack tracer"
 
 echo 1 > /proc/sys/kernel/stack_tracer_enabled

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

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function pid notrace filters
+# requires: set_ftrace_notrace_pid
 # flags: instance
 
 # Make sure that function pid matching filter with notrace works.
@@ -10,11 +11,6 @@ if ! grep -q function available_tracers; then
     exit_unsupported
 fi
 
-if [ ! -f set_ftrace_notrace_pid ]; then
-    echo "set_ftrace_notrace_pid 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

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function pid filters
+# requires: set_ftrace_pid
 # flags: instance
 
 # Make sure that function pid matching filter works.
@@ -11,11 +12,6 @@ if ! grep -q function available_tracers; then
     exit_unsupported
 fi
 
-if [ ! -f set_ftrace_pid ]; then
-    echo "set_ftrace_pid 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_profile_stat.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function profiling
-
-[ ! -f function_profile_enabled ] && exit_unsupported
+# requires: function_profile_enabled
 
 : "Enable function profile"
 echo 1 > function_profile_enabled

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

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - function profiler with function tracing
+# requires: function_profile_enabled
 
 # There was a bug after a rewrite of the ftrace infrastructure that
 # caused the function_profiler not to be able to run with the function
@@ -20,11 +21,6 @@ fi
 
 check_filter_file set_ftrace_filter
 
-if [ ! -f function_profile_enabled ]; then
-    echo "function_profile_enabled not found, function profiling enabled?"
-    exit_unsupported
-fi
-
 fail() { # mesg
     echo $1
     exit_fail

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

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - Max stack tracer
+# requires: stack_trace
 # Test the basic function of max-stack usage tracing
 
-if [ ! -f stack_trace ]; then
-  echo "Max stack tracer is not supported - please make CONFIG_STACK_TRACER=y"
-  exit_unsupported
-fi
-
 check_filter_file stack_trace_filter
 
 echo > stack_trace_filter

tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: ftrace - test tracing error log support
+# event tracing is currently the only ftrace tracer that uses the
+# tracing error_log, hence this check
+# requires: set_event error_log
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-# event tracing is currently the only ftrace tracer that uses the
-# tracing error_log, hence this check
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-[ -f error_log ] || exit_unsupported
-
 ftrace_errlog_check 'event filter parse error' '((sig >= 10 && sig < 15) || dsig ^== 17) && comm != bash' 'events/signal/signal_generate/filter'
 
 exit 0

tools/testing/selftests/ftrace/test.d/instances/instance-event.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Test creation and deletion of trace instances while setting an event
-
-if [ ! -d instances ] ; then
-    echo "no instance directory with this kernel"
-    exit_unsupported;
-fi
+# requires: instances
 
 fail() { # mesg
     rmdir foo 2>/dev/null

tools/testing/selftests/ftrace/test.d/instances/instance.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Test creation and deletion of trace instances
-
-if [ ! -d instances ] ; then
-    echo "no instance directory with this kernel"
-    exit_unsupported;
-fi
+# requires: instances
 
 fail() { # mesg
     rmdir x y z 2>/dev/null

tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe dynamic event - adding and removing
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 echo p:myevent _do_fork > kprobe_events
 grep myevent kprobe_events

tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe dynamic event - busy event check
-
-[ -f kprobe_events ] || exit_unsupported
+# requires: kprobe_events
 
 echo p:myevent _do_fork > kprobe_events
 test -d events/kprobes/myevent

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe dynamic event with arguments
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 echo 'p:testprobe _do_fork $stack $stack0 +0($stack)' > kprobe_events
 grep testprobe kprobe_events | grep -q 'arg1=\$stack arg2=\$stack0 arg3=+0(\$stack)'

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe event with comm arguments
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 grep -A1 "fetcharg:" README | grep -q "\$comm" || exit_unsupported # this is too old
 

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe event string type argument
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 case `uname -m` in
 x86_64)

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe event symbol argument
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 SYMBOL="linux_proc_banner"
 

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe event argument syntax
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 grep "x8/16/32/64" README > /dev/null || exit_unsupported # version issue
 

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobes event arguments with types
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 grep "x8/16/32/64" README > /dev/null || exit_unsupported # version issue
 

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_user.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe event user-memory access
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 grep -q '\$arg<N>' README || exit_unsupported # depends on arch
 grep -A10 "fetcharg:" README | grep -q 'ustring' || exit_unsupported

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_eventname.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe event auto/manual naming
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 :;: "Add an event on function without name" ;:
 

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe dynamic event with function tracer
+# requires: kprobe_events
 
-[ -f kprobe_events ] || exit_unsupported # this is configurable
 grep "function" available_tracers || exit_unsupported # this is configurable
 
 check_filter_file set_ftrace_filter

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_module.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe dynamic event - probing module
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 rmmod trace-printk ||:
 if ! modprobe trace-printk ; then

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Create/delete multiprobe on kprobe event
-
-[ -f kprobe_events ] || exit_unsupported
+# requires: kprobe_events
 
 grep -q "Create/append/" README || exit_unsupported
 

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe event parser error log check
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
-
-[ -f error_log ] || exit_unsupported
+# requires: kprobe_events error_log
 
 check_error() { # command-with-error-pos-by-^
     ftrace_errlog_check 'trace_kprobe' "$1" 'kprobe_events'

tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kretprobe dynamic event with arguments
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 # Add new kretprobe event
 echo 'r:testprobe2 _do_fork $retval' > kprobe_events

tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_maxactive.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kretprobe dynamic event with maxactive
+# requires: kprobe_events
 
-[ -f kprobe_events ] || exit_unsupported # this is configurable
 grep -q 'r\[maxactive\]' README || exit_unsupported # this is older version
 
 # Test if we successfully reject unknown messages

tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Register/unregister many kprobe events
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 # ftrace fentry skip size depends on the machine architecture.
 # Currently HAVE_KPROBES_ON_FTRACE defined on x86 and powerpc64le

tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe events - probe points
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 TARGET_FUNC=tracefs_create_dir
 

tools/testing/selftests/ftrace/test.d/kprobe/profile.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Kprobe dynamic event - adding and removing
-
-[ -f kprobe_events ] || exit_unsupported # this is configurable
+# requires: kprobe_events
 
 ! grep -q 'myevent' kprobe_profile
 echo p:myevent _do_fork > kprobe_events

tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: Uprobe event parser error log check
-
-[ -f uprobe_events ] || exit_unsupported # this is configurable
-
-[ -f error_log ] || exit_unsupported
+# requires: uprobe_events error_log
 
 check_error() { # command-with-error-pos-by-^
     ftrace_errlog_check 'trace_uprobe' "$1" 'uprobe_events'

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test inter-event histogram trigger expected fail actions
+# requires: set_event snapshot
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f snapshot ]; then
-    echo "snapshot is not supported"
-    exit_unsupported
-fi
-
 grep -q "snapshot()" README || exit_unsupported # version issue
 
 echo "Test expected snapshot action failure"

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-field-variable-support.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test field variable support
+# requires: set_event synthetic_events events/sched/sched_process_fork/hist
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic event is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test field variable support"
 
 echo 'wakeup_latency u64 lat; pid_t pid; int prio; char comm[16]' > synthetic_events

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-inter-event-combined-hist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test inter-event combined histogram trigger
+# requires: set_event synthetic_events events/sched/sched_process_fork/hist
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic event is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test create synthetic event"
 
 echo 'waking_latency  u64 lat pid_t pid' > synthetic_events

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-multi-actions-accept.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test multiple actions on hist trigger
+# requires: set_event synthetic_events events/sched/sched_process_fork/hist
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic event is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test multiple actions on hist trigger"
 echo 'wakeup_latency u64 lat; pid_t pid' >> synthetic_events
 TRIGGER1=events/sched/sched_wakeup/trigger

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onchange-action-hist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test inter-event histogram trigger onchange action
+# requires: set_event
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
 grep -q "onchange(var)" README || exit_unsupported # version issue
 
 echo "Test onchange action"

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmatch-action-hist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test inter-event histogram trigger onmatch action
+# requires: set_event synthetic_events events/sched/sched_process_fork/hist
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic event is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test create synthetic event"
 
 echo 'wakeup_latency  u64 lat pid_t pid char comm[16]' > synthetic_events

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmatch-onmax-action-hist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test inter-event histogram trigger onmatch-onmax action
+# requires: set_event synthetic_events events/sched/sched_process_fork/hist
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic event is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test create synthetic event"
 
 echo 'wakeup_latency  u64 lat pid_t pid char comm[16]' > synthetic_events

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmax-action-hist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test inter-event histogram trigger onmax action
+# requires: set_event synthetic_events events/sched/sched_process_fork/hist
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic event is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test create synthetic event"
 
 echo 'wakeup_latency  u64 lat pid_t pid char comm[16]' > synthetic_events

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-snapshot-action-hist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test inter-event histogram trigger snapshot action
+# requires: set_event snapshot events/sched/sched_process_fork/hist
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f snapshot ]; then
-    echo "snapshot is not supported"
-    exit_unsupported
-fi
-
 grep -q "onchange(var)" README || exit_unsupported # version issue
 
 grep -q "snapshot()" README || exit_unsupported # version issue

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-createremove.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test synthetic event create remove
+# requires: set_event synthetic_events
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic event is not supported"
-    exit_unsupported
-fi
-
 echo "Test create synthetic event"
 
 echo 'wakeup_latency  u64 lat pid_t pid char comm[16]' > synthetic_events

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-syntax.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test synthetic_events syntax parser
+# requires: set_event synthetic_events
 
 do_reset() {
     reset_trigger
@@ -14,16 +15,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic event is not supported"
-    exit_unsupported
-fi
-
 reset_tracer
 do_reset
 

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-trace-action-hist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test inter-event histogram trigger trace action
+# requires: set_event synthetic_events events/sched/sched_process_fork/hist
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic event is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 grep -q "trace(<synthetic_event>" README || exit_unsupported # version issue
 
 echo "Test create synthetic event"

tools/testing/selftests/ftrace/test.d/trigger/trigger-eventonoff.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test event enable/disable trigger
+# requires: set_event events/sched/sched_process_fork/trigger
 # flags: instance
 
 fail() { #msg
@@ -8,16 +9,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
 FEATURE=`grep enable_event events/sched/sched_process_fork/trigger`
 if [ -z "$FEATURE" ]; then
     echo "event enable/disable trigger is not supported"

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

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test trigger filter
+# requires: set_event events/sched/sched_process_fork/trigger
 # flags: instance
 
 fail() { #msg
@@ -8,16 +9,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test trigger filter"
 echo 1 > tracing_on
 echo 'traceoff if child_pid == 0' > events/sched/sched_process_fork/trigger

tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test histogram modifiers
+# requires: set_event events/sched/sched_process_fork/trigger events/sched/sched_process_fork/hist
 # flags: instance
 
 fail() { #msg
@@ -8,21 +9,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test histogram with execname modifier"
 
 echo 'hist:keys=common_pid.execname' > events/sched/sched_process_fork/trigger

tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-syntax-errors.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test histogram parser errors
-
-if [ ! -f set_event -o ! -d events/kmem ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/kmem/kmalloc/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/kmem/kmalloc/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
-[ -f error_log ] || exit_unsupported
+# requires: set_event events/kmem/kmalloc/trigger events/kmem/kmalloc/hist error_log
 
 check_error() { # command-with-error-pos-by-^
     ftrace_errlog_check 'hist:kmem:kmalloc' "$1" 'events/kmem/kmalloc/trigger'

tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test histogram trigger
+# requires: set_event events/sched/sched_process_fork/trigger events/sched/sched_process_fork/hist
 # flags: instance
 
 fail() { #msg
@@ -8,21 +9,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test histogram basic trigger"
 
 echo 'hist:keys=parent_pid:vals=child_pid' > events/sched/sched_process_fork/trigger

tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test multiple histogram triggers
+# requires: set_event events/sched/sched_process_fork/trigger events/sched/sched_process_fork/hist
 # flags: instance
 
 fail() { #msg
@@ -8,21 +9,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test histogram multiple triggers"
 
 echo 'hist:keys=parent_pid:vals=child_pid' > events/sched/sched_process_fork/trigger

tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test snapshot-trigger
+# requires: set_event events/sched/sched_process_fork/trigger snapshot
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f snapshot ]; then
-    echo "snapshot is not supported"
-    exit_unsupported
-fi
-
 FEATURE=`grep snapshot events/sched/sched_process_fork/trigger`
 if [ -z "$FEATURE" ]; then
     echo "snapshot trigger is not supported"

tools/testing/selftests/ftrace/test.d/trigger/trigger-stacktrace.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test stacktrace-trigger
+# requires: set_event events/sched/sched_process_fork/trigger
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
 FEATURE=`grep stacktrace events/sched/sched_process_fork/trigger`
 if [ -z "$FEATURE" ]; then
     echo "stacktrace trigger is not supported"

tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-hist.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: trace_marker trigger - test histogram trigger
+# requires: set_event events/ftrace/print/trigger events/ftrace/print/hist
 # flags: instance
 
 fail() { #msg
@@ -8,26 +9,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -d events/ftrace/print ]; then
-    echo "event trace_marker is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/ftrace/print/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/ftrace/print/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test histogram trace_marker trigger"
 
 echo 'hist:keys=common_pid' > events/ftrace/print/trigger

tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: trace_marker trigger - test snapshot trigger
+# requires: set_event snapshot events/ftrace/print/trigger
 # flags: instance
 
 fail() { #msg
@@ -8,26 +9,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f snapshot ]; then
-    echo "snapshot is not supported"
-    exit_unsupported
-fi
-
-if [ ! -d events/ftrace/print ]; then
-    echo "event trace_marker is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/ftrace/print/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
 test_trace() {
     file=$1
     x=$2

tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic-kernel.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: trace_marker trigger - test histogram with synthetic event against kernel event
+# requires: set_event synthetic_events events/sched/sched_waking events/ftrace/print/trigger events/ftrace/print/hist
 # flags:
 
 fail() { #msg
@@ -8,36 +9,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic events not supported"
-    exit_unsupported
-fi
-
-if [ ! -d events/ftrace/print ]; then
-    echo "event trace_marker is not supported"
-    exit_unsupported
-fi
-
-if [ ! -d events/sched/sched_waking ]; then
-    echo "event sched_waking is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/ftrace/print/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/ftrace/print/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test histogram kernel event to trace_marker latency histogram trigger"
 
 echo 'latency u64 lat' > synthetic_events

tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: trace_marker trigger - test histogram with synthetic event
+# requires: set_event synthetic_events events/ftrace/print/trigger events/ftrace/print/hist
 # flags:
 
 fail() { #msg
@@ -8,31 +9,6 @@ fail() { #msg
     exit_fail
 }
 
-if [ ! -f set_event ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
-    echo "synthetic events not supported"
-    exit_unsupported
-fi
-
-if [ ! -d events/ftrace/print ]; then
-    echo "event trace_marker is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/ftrace/print/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/ftrace/print/hist ]; then
-    echo "hist trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test histogram trace_marker to trace_marker latency histogram trigger"
 
 echo 'latency u64 lat' > synthetic_events

tools/testing/selftests/ftrace/test.d/trigger/trigger-traceonoff.tc

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # description: event trigger - test traceon/off trigger
+# requires: set_event events/sched/sched_process_fork/trigger
 
 fail() { #msg
     echo $1
     exit_fail
 }
 
-if [ ! -f set_event -o ! -d events/sched ]; then
-    echo "event tracing is not supported"
-    exit_unsupported
-fi
-
-if [ ! -f events/sched/sched_process_fork/trigger ]; then
-    echo "event trigger is not supported"
-    exit_unsupported
-fi
-
 echo "Test traceoff trigger"
 echo 1 > tracing_on
 echo 'traceoff' > events/sched/sched_process_fork/trigger