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
31EVALUATE_ONLY=0
32
33# Kselftest framework requirement - SKIP code is 4.
34ksft_skip=4
35
36if ! 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
39fi
40
41msg="skip all tests:"
42if [ $UID != 0 ] && [ $EVALUATE_ONLY == 0 ]; then
43    echo $msg please run this as root >&2
44    exit $ksft_skip
45fi
46
47max_cpus=$(($(nproc)-1))
48
49function 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 $_mkt_freq | tr -d [:alpha:][:punct:])
86mkt_freq=${_mkt_freq}0
87
88# Get the ranges from cpupower
89_min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ')
90min_freq=$(($_min_freq / 1000))
91_max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ')
92max_freq=$(($_max_freq / 1000))
93
94
95[ $EVALUATE_ONLY -eq 0 ] && for freq in `seq $max_freq -100 $min_freq`
96do
97	echo "Setting maximum frequency to $freq"
98	cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null
99	run_test $freq
100done
101
102[ $EVALUATE_ONLY -eq 0 ] && cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null
103
104echo "========================================================================"
105echo "The marketing frequency of the cpu is $mkt_freq MHz"
106echo "The maximum frequency of the cpu is $max_freq MHz"
107echo "The minimum frequency of the cpu is $min_freq MHz"
108
109# make a pretty table
110echo "Target Actual Difference MSR(0x199) max_perf_pct" | tr " " "\n" > /tmp/result.tab
111for freq in `seq $max_freq -100 $min_freq`
112do
113	result_freq=$(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))
122EOF
123done
124
125# print the table
126pr -aTt -5 < /tmp/result.tab
127
128exit 0
129