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 $ksft_skip
  39 fi
  40
  41 max_cpus=$(($(nproc)-1))
  42
  43 function run_test () {
  44
  45         file_ext=$1
  46         for cpu in `seq 0 $max_cpus`
  47         do
  48                 echo "launching aperf load on $cpu"
  49                 ./aperf $cpu &
  50         done
  51
  52         echo "sleeping for 5 seconds"
  53         sleep 5
  54         grep MHz /proc/cpuinfo | sort -u > /tmp/result.freqs
  55         num_freqs=$(wc -l /tmp/result.freqs | awk ' { print $1 } ')
  56         if [ $num_freqs -ge 2 ]; then
  57                 tail -n 1 /tmp/result.freqs > /tmp/result.$1
  58         else
  59                 cp /tmp/result.freqs /tmp/result.$1
  60         fi
  61         ./msr 0 >> /tmp/result.$1
  62
  63         max_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/max_perf_pct)
  64         echo "max_perf_pct $max_perf_pct" >> /tmp/result.$1
  65
  66         for job in `jobs -p`
  67         do
  68                 echo "waiting for job id $job"
  69                 wait $job
  70         done
  71 }
  72
  73 #
  74 # MAIN (ALL UNITS IN MHZ)
  75 #
  76
  77 # Get the marketing frequency
  78 _mkt_freq=$(cat /proc/cpuinfo | grep -m 1 "model name" | awk '{print $NF}')
  79 _mkt_freq=$(echo $_mkt_freq | tr -d [:alpha:][:punct:])
  80 mkt_freq=${_mkt_freq}0
  81
  82 # Get the ranges from cpupower
  83 _min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ')
  84 min_freq=$(($_min_freq / 1000))
  85 _max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ')
  86 max_freq=$(($_max_freq / 1000))
  87
  88
  89 [ $EVALUATE_ONLY -eq 0 ] && for freq in `seq $max_freq -100 $min_freq`
  90 do
  91         echo "Setting maximum frequency to $freq"
  92         cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null
  93         run_test $freq
  94 done
  95
  96 [ $EVALUATE_ONLY -eq 0 ] && cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null
  97
  98 echo "=============================================================================="
  99 echo "The marketing frequency of the cpu is $mkt_freq MHz"
 100 echo "The maximum frequency of the cpu is $max_freq MHz"
 101 echo "The minimum frequency of the cpu is $min_freq MHz"
 102
 103 # make a pretty table
 104 echo "Target      Actual      Difference     MSR(0x199)     max_perf_pct"
 105 for freq in `seq $max_freq -100 $min_freq`
 106 do
 107         result_freq=$(cat /tmp/result.${freq} | grep "cpu MHz" | awk ' { print $4 } ' | awk -F "." ' { print $1 } ')
 108         msr=$(cat /tmp/result.${freq} | grep "msr" | awk ' { print $3 } ')
 109         max_perf_pct=$(cat /tmp/result.${freq} | grep "max_perf_pct" | awk ' { print $2 } ' )
 110         echo " $freq        $result_freq          $(($result_freq-$freq))          $msr          $(($max_perf_pct*$max_freq))"
 111 done
 112 exit 0