tools/testing/selftests/intel_pstate/run.sh

   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