perf test: test_intel_pt.sh: Add 9 tests

Add tests:
	Test with MTC and TSC disabled
	Test with branches disabled
	Test with/without CYC
	Test recording with sample mode
	Test with kernel trace
	Test virtual LBR
	Test power events
	Test with TNT packets disabled
	Test with event_trace

These tests mostly check that perf record works with the corresponding
Intel PT config terms, sometimes also checking that certain packets do or
do not appear in the resulting trace as appropriate.

The "Test virtual LBR" is slightly trickier, using a Python script to
check that branch stacks are actually synthesized.

Signed-off-by: Ammy Yi <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Adrian Hunter <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: ammyyi

tools/perf/tests/shell/test_intel_pt.sh

@@ -23,6 +23,7 @@ errfile="${temp_dir}/test-err.txt"
 workload="${temp_dir}/workload"
 awkscript="${temp_dir}/awkscript"
 jitdump_workload="${temp_dir}/jitdump_workload"
+maxbrstack="${temp_dir}/maxbrstack.py"
 
 cleanup()
 {
@@ -422,14 +423,197 @@ test_jitdump()
 	# Should be no errors
 	if [ "${decode_err_cnt}" -ne 0 ] ; then
 		echo "Decode failed, ${decode_err_cnt} errors"
-		perf script -i "${perfdatafile}" --itrace=e-o-l
+		perf script -i "${perfdatafile}" --itrace=e-o-l --show-mmap-events | cat
 		return 1
 	fi
 
 	echo OK
 	return 0
 }
 
+test_packet_filter()
+{
+	echo "--- Test with MTC and TSC disabled ---"
+	# Disable MTC and TSC
+	perf_record_no_decode -o "${perfdatafile}" -e intel_pt/mtc=0,tsc=0/u uname
+	# Should not get MTC packet
+	mtc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "MTC 0x")
+	if [ "${mtc_cnt}" -ne 0 ] ; then
+		echo "Failed to filter with mtc=0"
+		return 1
+	fi
+	# Should not get TSC package
+	tsc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "TSC 0x")
+	if [ "${tsc_cnt}" -ne 0 ] ; then
+		echo "Failed to filter with tsc=0"
+		return 1
+	fi
+	echo OK
+	return 0
+}
+
+test_disable_branch()
+{
+	echo "--- Test with branches disabled ---"
+	# Disable branch
+	perf_record_no_decode -o "${perfdatafile}" -e intel_pt/branch=0/u uname
+	# Should not get branch related packets
+	tnt_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "TNT 0x")
+	tip_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "TIP 0x")
+	fup_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "FUP 0x")
+	if [ "${tnt_cnt}" -ne 0 ] || [ "${tip_cnt}" -ne 0 ] || [ "${fup_cnt}" -ne 0 ] ; then
+		echo "Failed to disable branches"
+		return 1
+	fi
+	echo OK
+	return 0
+}
+
+test_time_cyc()
+{
+	echo "--- Test with/without CYC ---"
+	# Check if CYC is supported
+	cyc=$(cat /sys/bus/event_source/devices/intel_pt/caps/psb_cyc)
+	if [ "${cyc}" != "1" ] ; then
+		echo "SKIP: CYC is not supported"
+		return 2
+	fi
+	# Enable CYC
+	perf_record_no_decode -o "${perfdatafile}" -e intel_pt/cyc/u uname
+	# should get CYC packets
+	cyc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "CYC 0x")
+	if [ "${cyc_cnt}" = "0" ] ; then
+		echo "Failed to get CYC packet"
+		return 1
+	fi
+	# Without CYC
+	perf_record_no_decode -o "${perfdatafile}" -e intel_pt//u uname
+	# Should not get CYC packets
+	cyc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "CYC 0x")
+	if [ "${cyc_cnt}" -gt 0 ] ; then
+		echo "Still get CYC packet without cyc"
+		return 1
+	fi
+	echo OK
+	return 0
+}
+
+test_sample()
+{
+	echo "--- Test recording with sample mode ---"
+	# Check if recording with sample mode is working
+	if ! perf_record_no_decode -o "${perfdatafile}" --aux-sample=8192 -e '{intel_pt//u,branch-misses:u}' uname ; then
+		echo "perf record failed with --aux-sample"
+		return 1
+	fi
+	echo OK
+	return 0
+}
+
+test_kernel_trace()
+{
+	echo "--- Test with kernel trace ---"
+	# Check if recording with kernel trace is working
+	can_kernel || return 2
+	if ! perf_record_no_decode -o "${perfdatafile}" -e intel_pt//k -m1,128 uname ; then
+		echo "perf record failed with intel_pt//k"
+		return 1
+	fi
+	echo OK
+	return 0
+}
+
+test_virtual_lbr()
+{
+	echo "--- Test virtual LBR ---"
+
+	# Python script to determine the maximum size of branch stacks
+	cat << "_end_of_file_" > "${maxbrstack}"
+from __future__ import print_function
+
+bmax = 0
+
+def process_event(param_dict):
+	if "brstack" in param_dict:
+		brstack = param_dict["brstack"]
+		n = len(brstack)
+		global bmax
+		if n > bmax:
+			bmax = n
+
+def trace_end():
+	print("max brstack", bmax)
+_end_of_file_
+
+	# Check if virtual lbr is working
+	perf_record_no_bpf -o "${perfdatafile}" --aux-sample -e '{intel_pt//,cycles}:u' uname
+	times_val=$(perf script -i "${perfdatafile}" --itrace=L -s "${maxbrstack}" 2>/dev/null | grep "max brstack " | cut -d " " -f 3)
+	case "${times_val}" in
+		[0-9]*)	;;
+		*)	times_val=0;;
+	esac
+	if [ "${times_val}" -lt 2 ] ; then
+		echo "Failed with virtual lbr"
+		return 1
+	fi
+	echo OK
+	return 0
+}
+
+test_power_event()
+{
+	echo "--- Test power events ---"
+	# Check if power events are supported
+	power_event=$(cat /sys/bus/event_source/devices/intel_pt/caps/power_event_trace)
+	if [ "${power_event}" != "1" ] ; then
+		echo "SKIP: power_event_trace is not supported"
+		return 2
+	fi
+	if ! perf_record_no_decode -o "${perfdatafile}" -a -e intel_pt/pwr_evt/u uname ; then
+		echo "perf record failed with pwr_evt"
+		return 1
+	fi
+	echo OK
+	return 0
+}
+
+test_no_tnt()
+{
+	echo "--- Test with TNT packets disabled  ---"
+	# Check if TNT disable is supported
+	notnt=$(cat /sys/bus/event_source/devices/intel_pt/caps/tnt_disable)
+	if [ "${notnt}" != "1" ] ; then
+		echo "SKIP: tnt_disable is not supported"
+		return 2
+	fi
+	perf_record_no_decode -o "${perfdatafile}" -e intel_pt/notnt/u uname
+	# Should be no TNT packets
+	tnt_cnt=$(perf script -i "${perfdatafile}" -D | grep -c TNT)
+	if [ "${tnt_cnt}" -ne 0 ] ; then
+		echo "TNT packets still there after notnt"
+		return 1
+	fi
+	echo OK
+	return 0
+}
+
+test_event_trace()
+{
+	echo "--- Test with event_trace ---"
+	# Check if event_trace is supported
+	event_trace=$(cat /sys/bus/event_source/devices/intel_pt/caps/event_trace)
+	if [ "${event_trace}" != 1 ] ; then
+		echo "SKIP: event_trace is not supported"
+		return 2
+	fi
+	if ! perf_record_no_decode -o "${perfdatafile}" -e intel_pt/event/u uname ; then
+		echo "perf record failed with event trace"
+		return 1
+	fi
+	echo OK
+	return 0
+}
+
 count_result()
 {
 	if [ "$1" -eq 2 ] ; then
@@ -448,6 +632,15 @@ test_system_wide_side_band		|| ret=$? ; count_result $ret ; ret=0
 test_per_thread "" ""			|| ret=$? ; count_result $ret ; ret=0
 test_per_thread "k" "(incl. kernel) "	|| ret=$? ; count_result $ret ; ret=0
 test_jitdump				|| ret=$? ; count_result $ret ; ret=0
+test_packet_filter			|| ret=$? ; count_result $ret ; ret=0
+test_disable_branch			|| ret=$? ; count_result $ret ; ret=0
+test_time_cyc				|| ret=$? ; count_result $ret ; ret=0
+test_sample				|| ret=$? ; count_result $ret ; ret=0
+test_kernel_trace			|| ret=$? ; count_result $ret ; ret=0
+test_virtual_lbr			|| ret=$? ; count_result $ret ; ret=0
+test_power_event			|| ret=$? ; count_result $ret ; ret=0
+test_no_tnt				|| ret=$? ; count_result $ret ; ret=0
+test_event_trace			|| ret=$? ; count_result $ret ; ret=0
 
 cleanup