1 #!/bin/bash 2 # SPDX-License-Identifier: GPL-2.0 3 # 4 # This test runs on Intel x86 based hardware which support the intel_pstate 5 # driver. The test checks the frequency settings from the maximum turbo 6 # state to the minimum supported frequency, in decrements of 100MHz. The 7 # test runs the aperf.c program to put load on each processor. 8 # 9 # The results are displayed in a table which indicate the "Target" state, 10 # or the requested frequency in MHz, the Actual frequency, as read from 11 # /proc/cpuinfo, the difference between the Target and Actual frequencies, 12 # and the value of MSR 0x199 (MSR_IA32_PERF_CTL) which indicates what 13 # pstate the cpu is in, and the value of 14 # /sys/devices/system/cpu/intel_pstate/max_perf_pct X maximum turbo state 15 # 16 # Notes: In some cases several frequency values may be placed in the 17 # /tmp/result.X files. This is done on purpose in order to catch cases 18 # where the pstate driver may not be working at all. There is the case 19 # where, for example, several "similar" frequencies are in the file: 20 # 21 # 22 #/tmp/result.3100:1:cpu MHz : 2899.980 23 #/tmp/result.3100:2:cpu MHz : 2900.000 24 #/tmp/result.3100:3:msr 0x199: 0x1e00 25 #/tmp/result.3100:4:max_perf_pct 94 26 # 27 # and the test will error out in those cases. The result.X file can be checked 28 # for consistency and modified to remove the extra MHz values. The result.X 29 # files can be re-evaluated by setting EVALUATE_ONLY to 1 below. 30 31 EVALUATE_ONLY=0 32 33 # Kselftest framework requirement - SKIP code is 4. 34 ksft_skip=4 35 36 if ! uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ | grep -q x86; then 37 echo "$0 # Skipped: Test can only run on x86 architectures." 38 exit $ksft_skip 39 fi 40 41 msg="skip all tests:" 42 if [ $UID != 0 ] && [ $EVALUATE_ONLY == 0 ]; then 43 echo $msg please run this as root >&2 44 exit $ksft_skip 45 fi 46 47 max_cpus=$(($(nproc)-1)) 48 49 function run_test () { 50 51 file_ext=$1 52 for cpu in `seq 0 $max_cpus` 53 do 54 echo "launching aperf load on $cpu" 55 ./aperf $cpu & 56 done 57 58 echo "sleeping for 5 seconds" 59 sleep 5 60 grep MHz /proc/cpuinfo | sort -u > /tmp/result.freqs 61 num_freqs=$(wc -l /tmp/result.freqs | awk ' { print $1 } ') 62 if [ $num_freqs -ge 2 ]; then 63 tail -n 1 /tmp/result.freqs > /tmp/result.$1 64 else 65 cp /tmp/result.freqs /tmp/result.$1 66 fi 67 ./msr 0 >> /tmp/result.$1 68 69 max_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/max_perf_pct) 70 echo "max_perf_pct $max_perf_pct" >> /tmp/result.$1 71 72 for job in `jobs -p` 73 do 74 echo "waiting for job id $job" 75 wait $job 76 done 77 } 78 79 # 80 # MAIN (ALL UNITS IN MHZ) 81 # 82 83 # Get the marketing frequency 84 _mkt_freq=$(cat /proc/cpuinfo | grep -m 1 "model name" | awk '{print $NF}') 85 _mkt_freq=$(echo $_mkt_freq | tr -d [:alpha:][:punct:]) 86 mkt_freq=${_mkt_freq}0 87 88 # Get the ranges from cpupower 89 _min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ') 90 min_freq=$(($_min_freq / 1000)) 91 _max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ') 92 max_freq=$(($_max_freq / 1000)) 93 94 95 [ $EVALUATE_ONLY -eq 0 ] && for freq in `seq $max_freq -100 $min_freq` 96 do 97 echo "Setting maximum frequency to $freq" 98 cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null 99 run_test $freq 100 done 101 102 [ $EVALUATE_ONLY -eq 0 ] && cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null 103 104 echo "========================================================================" 105 echo "The marketing frequency of the cpu is $mkt_freq MHz" 106 echo "The maximum frequency of the cpu is $max_freq MHz" 107 echo "The minimum frequency of the cpu is $min_freq MHz" 108 109 # make a pretty table 110 echo "Target Actual Difference MSR(0x199) max_perf_pct" | tr " " "\n" > /tmp/result.tab 111 for freq in `seq $max_freq -100 $min_freq` 112 do 113 result_freq=$(cat /tmp/result.${freq} | grep "cpu MHz" | awk ' { print $4 } ' | awk -F "." ' { print $1 } ') 114 msr=$(cat /tmp/result.${freq} | grep "msr" | awk ' { print $3 } ') 115 max_perf_pct=$(cat /tmp/result.${freq} | grep "max_perf_pct" | awk ' { print $2 } ' ) 116 cat >> /tmp/result.tab << EOF 117 $freq 118 $result_freq 119 $((result_freq - freq)) 120 $msr 121 $((max_perf_pct * max_freq)) 122 EOF 123 done 124 125 # print the table 126 pr -aTt -5 < /tmp/result.tab 127 128 exit 0 129
