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 if ! command -v cpupower &> /dev/null; then
48 echo $msg cpupower could not be found, please install it >&2
49 exit $ksft_skip
50 fi
51
52 max_cpus=$(($(nproc)-1))
53
54 function run_test () {
55
56 file_ext=$1
57 for cpu in `seq 0 $max_cpus`
58 do
59 echo "launching aperf load on $cpu"
60 ./aperf $cpu &
61 done
62
63 echo "sleeping for 5 seconds"
64 sleep 5
65 grep MHz /proc/cpuinfo | sort -u > /tmp/result.freqs
66 num_freqs=$(wc -l /tmp/result.freqs | awk ' { print $1 } ')
67 if [ $num_freqs -ge 2 ]; then
68 tail -n 1 /tmp/result.freqs > /tmp/result.$1
69 else
70 cp /tmp/result.freqs /tmp/result.$1
71 fi
72 ./msr 0 >> /tmp/result.$1
73
74 max_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/max_perf_pct)
75 echo "max_perf_pct $max_perf_pct" >> /tmp/result.$1
76
77 for job in `jobs -p`
78 do
79 echo "waiting for job id $job"
80 wait $job
81 done
82 }
83
84 #
85 # MAIN (ALL UNITS IN MHZ)
86 #
87
88 # Get the marketing frequency
89 _mkt_freq=$(cat /proc/cpuinfo | grep -m 1 "model name" | awk '{print $NF}')
90 _mkt_freq=$(echo $_mkt_freq | tr -d [:alpha:][:punct:])
91 mkt_freq=${_mkt_freq}0
92
93 # Get the ranges from cpupower
94 _min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ')
95 min_freq=$((_min_freq / 1000))
96 _max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ')
97 max_freq=$((_max_freq / 1000))
98
99
100 [ $EVALUATE_ONLY -eq 0 ] && for freq in `seq $max_freq -100 $min_freq`
101 do
102 echo "Setting maximum frequency to $freq"
103 cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null
104 run_test $freq
105 done
106
107 [ $EVALUATE_ONLY -eq 0 ] && cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null
108
109 echo "========================================================================"
110 echo "The marketing frequency of the cpu is $mkt_freq MHz"
111 echo "The maximum frequency of the cpu is $max_freq MHz"
112 echo "The minimum frequency of the cpu is $min_freq MHz"
113
114 # make a pretty table
115 echo "Target Actual Difference MSR(0x199) max_perf_pct" | tr " " "\n" > /tmp/result.tab
116 for freq in `seq $max_freq -100 $min_freq`
117 do
118 result_freq=$(cat /tmp/result.${freq} | grep "cpu MHz" | awk ' { print $4 } ' | awk -F "." ' { print $1 } ')
119 msr=$(cat /tmp/result.${freq} | grep "msr" | awk ' { print $3 } ')
120 max_perf_pct=$(cat /tmp/result.${freq} | grep "max_perf_pct" | awk ' { print $2 } ' )
121 cat >> /tmp/result.tab << EOF
122 $freq
123 $result_freq
124 $((result_freq - freq))
125 $msr
126 $((max_perf_pct * max_freq))
127 EOF
128 done
129
130 # print the table
131 pr -aTt -5 < /tmp/result.tab
132
133 exit 0
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