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##/bin/bash
# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (c) 2022 Oracle. All Rights Reserved.
#
# Routines for dealing with ftrace (or any other tracing).
_require_ftrace() {
if [ -d /sys/kernel/tracing/instances/ ];then
FTRACE_ROOT="/sys/kernel/tracing"
FTRACE_INSTANCES_DIR="/sys/kernel/tracing/instances"
elif [ -d /sys/kernel/debug/tracing/instances/ ];then
FTRACE_ROOT="/sys/kernel/debug/tracing"
FTRACE_INSTANCES_DIR="/sys/kernel/debug/tracing/instances"
else
_notrun "The ftrace is not supported, or tracefs is not mounted"
fi
}
_ftrace_cleanup() {
if [ -d "$FTRACE_DIR" ]; then
_ftrace_ignore_events
# Removing an ftrace buffer requires rmdir, even though the
# virtual directory contains children.
rmdir "$FTRACE_DIR"
fi
}
_ftrace_setup() {
test -n "$FTRACE_DIR" && _fail "_ftrace_setup already run?"
# Give this fstest its own ftrace buffer so that we don't mess up
# any other tracers that might be running.
FTRACE_DIR="$FTRACE_INSTANCES_DIR/fstests.$seq"
test -d "$FTRACE_DIR" && rmdir "$FTRACE_DIR"
mkdir "$FTRACE_DIR"
}
# Intercept the given events. Arguments may be regular expressions.
_ftrace_record_events() {
test -d "$FTRACE_DIR" || _fail "_ftrace_setup not run?"
for arg in "$@"; do
# Replace slashes with semicolons per ftrace convention
find "$FTRACE_DIR/events/" -type d -name "$arg" -printf '%P\n' | \
tr '/' ':' >> "$FTRACE_DIR/set_event"
done
}
# Stop intercepting the given events. If no arguments, stops all events.
_ftrace_ignore_events() {
test -d "$FTRACE_DIR" || _fail "_ftrace_setup not run?"
if [ "$#" -eq 0 ]; then
echo > "$FTRACE_DIR/set_event"
else
for arg in "$@"; do
# Replace slashes with semicolons per ftrace convention
find "$FTRACE_DIR/events/" -type d -name "$arg" -printf '!%P\n' | \
tr '/' ':' >> "$FTRACE_DIR/set_event"
done
fi
}
# Dump whatever was written to the ftrace buffer since the last time this
# helper was called.
_ftrace_dump() {
test -d "$FTRACE_DIR" || _fail "_ftrace_setup not run?"
cat "$FTRACE_DIR/trace"
}
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