linux-stable/tools/testing/selftests/intel_pstate/run.sh
Jeffrin Jose T 9070ee31ab selftests: intel_pstate: notification about privilege required to run intel_pstate testing script
The intel_pstate related testing script need root level privileges
when trying to access certain file for the successful execution of
the script.But this is not the case always like when using evaluation
only mode, which only require user level privilege.

This patch is to notify the user about the privilege the script
demands for the successful execution of the test.

Signed-off-by: Jeffrin Jose T (Rajagiri SET) <ahiliation@gmail.com>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
2018-05-30 21:31:31 -06:00

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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# This test runs on Intel x86 based hardware which support the intel_pstate
# driver. The test checks the frequency settings from the maximum turbo
# state to the minimum supported frequency, in decrements of 100MHz. The
# test runs the aperf.c program to put load on each processor.
#
# The results are displayed in a table which indicate the "Target" state,
# or the requested frequency in MHz, the Actual frequency, as read from
# /proc/cpuinfo, the difference between the Target and Actual frequencies,
# and the value of MSR 0x199 (MSR_IA32_PERF_CTL) which indicates what
# pstate the cpu is in, and the value of
# /sys/devices/system/cpu/intel_pstate/max_perf_pct X maximum turbo state
#
# Notes: In some cases several frequency values may be placed in the
# /tmp/result.X files. This is done on purpose in order to catch cases
# where the pstate driver may not be working at all. There is the case
# where, for example, several "similar" frequencies are in the file:
#
#
#/tmp/result.3100:1:cpu MHz : 2899.980
#/tmp/result.3100:2:cpu MHz : 2900.000
#/tmp/result.3100:3:msr 0x199: 0x1e00
#/tmp/result.3100:4:max_perf_pct 94
#
# and the test will error out in those cases. The result.X file can be checked
# for consistency and modified to remove the extra MHz values. The result.X
# files can be re-evaluated by setting EVALUATE_ONLY to 1 below.
EVALUATE_ONLY=0
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
if ! uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ | grep -q x86; then
echo "$0 # Skipped: Test can only run on x86 architectures."
exit $ksft_skip
fi
msg="skip all tests:"
if [ $UID != 0 ] && [ $EVALUATE_ONLY == 0 ]; then
echo $msg please run this as root >&2
exit $ksft_skip
fi
max_cpus=$(($(nproc)-1))
function run_test () {
file_ext=$1
for cpu in `seq 0 $max_cpus`
do
echo "launching aperf load on $cpu"
./aperf $cpu &
done
echo "sleeping for 5 seconds"
sleep 5
grep MHz /proc/cpuinfo | sort -u > /tmp/result.freqs
num_freqs=$(wc -l /tmp/result.freqs | awk ' { print $1 } ')
if [ $num_freqs -ge 2 ]; then
tail -n 1 /tmp/result.freqs > /tmp/result.$1
else
cp /tmp/result.freqs /tmp/result.$1
fi
./msr 0 >> /tmp/result.$1
max_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/max_perf_pct)
echo "max_perf_pct $max_perf_pct" >> /tmp/result.$1
for job in `jobs -p`
do
echo "waiting for job id $job"
wait $job
done
}
#
# MAIN (ALL UNITS IN MHZ)
#
# Get the marketing frequency
_mkt_freq=$(cat /proc/cpuinfo | grep -m 1 "model name" | awk '{print $NF}')
_mkt_freq=$(echo $_mkt_freq | tr -d [:alpha:][:punct:])
mkt_freq=${_mkt_freq}0
# Get the ranges from cpupower
_min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ')
min_freq=$(($_min_freq / 1000))
_max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ')
max_freq=$(($_max_freq / 1000))
[ $EVALUATE_ONLY -eq 0 ] && for freq in `seq $max_freq -100 $min_freq`
do
echo "Setting maximum frequency to $freq"
cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null
run_test $freq
done
[ $EVALUATE_ONLY -eq 0 ] && cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null
echo "========================================================================"
echo "The marketing frequency of the cpu is $mkt_freq MHz"
echo "The maximum frequency of the cpu is $max_freq MHz"
echo "The minimum frequency of the cpu is $min_freq MHz"
# make a pretty table
echo "Target Actual Difference MSR(0x199) max_perf_pct" | tr " " "\n" > /tmp/result.tab
for freq in `seq $max_freq -100 $min_freq`
do
result_freq=$(cat /tmp/result.${freq} | grep "cpu MHz" | awk ' { print $4 } ' | awk -F "." ' { print $1 } ')
msr=$(cat /tmp/result.${freq} | grep "msr" | awk ' { print $3 } ')
max_perf_pct=$(cat /tmp/result.${freq} | grep "max_perf_pct" | awk ' { print $2 } ' )
cat >> /tmp/result.tab << EOF
$freq
$result_freq
$((result_freq - freq))
$msr
$((max_perf_pct * max_freq))
EOF
done
# print the table
pr -aTt -5 < /tmp/result.tab
exit 0