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