Commit 37f46601 authored by Steven Rostedt's avatar Steven Rostedt Committed by Shuah Khan
Browse files

selftests/tracing: Add basic test for trace_marker_raw file 

Commit 64cf7d05 ("tracing: Have trace_marker use per-cpu data to read
user space") made an update that fixed both trace_marker and
trace_marker_raw. But the small difference made to trace_marker_raw had a
blatant bug in it that any basic testing would have uncovered.
Unfortunately, the self tests have tests for trace_marker but nothing for
trace_marker_raw which allowed the bug to get upstream.

Add basic selftests to test trace_marker_raw so that this doesn't happen
again.

Link: https://lore.kernel.org/r/20251014145149.3e3c1033@gandalf.local.home


Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: default avatarShuah Khan <skhan@linuxfoundation.org>
parent 3a866087

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

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#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Basic tests on writing to trace_marker_raw

# requires: trace_marker_raw

# flags: instance



is_little_endian() {

	if lscpu | grep -q 'Little Endian'; then

		echo 1;

	else

		echo 0;

	fi

}



little=`is_little_endian`



make_str() {

	id=$1

	cnt=$2



	if [ $little -eq 1 ]; then

		val=`printf "\\%03o\\%03o\\%03o\\%03o" \

			$(($id & 0xff)) \

			$((($id >> 8) & 0xff)) \

			$((($id >> 16) & 0xff)) \

			$((($id >> 24) & 0xff))`

	else

		val=`printf "\\%03o\\%03o\\%03o\\%03o" \

			$((($id >> 24) & 0xff)) \

			$((($id >> 16) & 0xff)) \

			$((($id >> 8) & 0xff)) \

			$(($id & 0xff))`

	fi



	data=`printf -- 'X%.0s' $(seq $cnt)`



	printf "${val}${data}"

}



write_buffer() {

	id=$1

	size=$2



	# write the string into the raw marker

	make_str $id $size > trace_marker_raw

}





test_multiple_writes() {



	# Write a bunch of data where the id is the count of

	# data to write

	for i in `seq 1 10` `seq 101 110` `seq 1001 1010`; do

		write_buffer $i $i

	done



	# add a little buffer

	echo stop > trace_marker



	# Check to make sure the number of entries is the id (rounded up by 4)

	awk '/.*: # [0-9a-f]* / {

			print;

			cnt = -1;

			for (i = 0; i < NF; i++) {

				# The counter is after the "#" marker

				if ( $i == "#" ) {

					i++;

					cnt = strtonum("0x" $i);

					num = NF - (i + 1);

					# The number of items is always rounded up by 4

					cnt2 = int((cnt + 3) / 4) * 4;

					if (cnt2 != num) {

						exit 1;

					}

					break;

				}

			}

		}

	// { if (NR > 30) { exit 0; } } ' trace_pipe;

}





get_buffer_data_size() {

	sed -ne 's/^.*data.*size:\([0-9][0-9]*\).*/\1/p' events/header_page

}



test_buffer() {



	# The id must be four bytes, test that 3 bytes fails a write

	if echo -n abc > ./trace_marker_raw ; then

		echo "Too small of write expected to fail but did not"

		exit_fail

	fi



	size=`get_buffer_data_size`

	echo size = $size



	# Now add a little more than what it can handle



	if write_buffer 0xdeadbeef $size ; then

		echo "Too big of write expected to fail but did not"

		exit_fail

	fi

}



test_buffer

test_multiple_writes