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-rw-r--r--tools/testing/selftests/intel_pstate/Makefile15
-rw-r--r--tools/testing/selftests/intel_pstate/aperf.c80
-rw-r--r--tools/testing/selftests/intel_pstate/msr.c39
-rwxr-xr-xtools/testing/selftests/intel_pstate/run.sh113
4 files changed, 247 insertions, 0 deletions
diff --git a/tools/testing/selftests/intel_pstate/Makefile b/tools/testing/selftests/intel_pstate/Makefile
new file mode 100644
index 0000000..f5f1a28
--- /dev/null
+++ b/tools/testing/selftests/intel_pstate/Makefile
@@ -0,0 +1,15 @@
+CC := $(CROSS_COMPILE)gcc
+CFLAGS := $(CFLAGS) -Wall -D_GNU_SOURCE
+LDFLAGS := $(LDFLAGS) -lm
+
+TARGETS := msr aperf
+
+TEST_PROGS := $(TARGETS) run.sh
+
+.PHONY: all clean
+all: $(TARGETS)
+
+$(TARGETS): $(HEADERS)
+
+clean:
+ rm -f $(TARGETS)
diff --git a/tools/testing/selftests/intel_pstate/aperf.c b/tools/testing/selftests/intel_pstate/aperf.c
new file mode 100644
index 0000000..6046e18
--- /dev/null
+++ b/tools/testing/selftests/intel_pstate/aperf.c
@@ -0,0 +1,80 @@
+#include <math.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/timeb.h>
+#include <sched.h>
+#include <errno.h>
+
+void usage(char *name) {
+ printf ("Usage: %s cpunum\n", name);
+}
+
+int main(int argc, char **argv) {
+ int i, cpu, fd;
+ char msr_file_name[64];
+ long long tsc, old_tsc, new_tsc;
+ long long aperf, old_aperf, new_aperf;
+ long long mperf, old_mperf, new_mperf;
+ struct timeb before, after;
+ long long int start, finish, total;
+ cpu_set_t cpuset;
+
+ if (argc != 2) {
+ usage(argv[0]);
+ return 1;
+ }
+
+ errno = 0;
+ cpu = strtol(argv[1], (char **) NULL, 10);
+
+ if (errno) {
+ usage(argv[0]);
+ return 1;
+ }
+
+ sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
+ fd = open(msr_file_name, O_RDONLY);
+
+ if (fd == -1) {
+ perror("Failed to open");
+ return 1;
+ }
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(cpu, &cpuset);
+
+ if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) {
+ perror("Failed to set cpu affinity");
+ return 1;
+ }
+
+ ftime(&before);
+ pread(fd, &old_tsc, sizeof(old_tsc), 0x10);
+ pread(fd, &old_aperf, sizeof(old_mperf), 0xe7);
+ pread(fd, &old_mperf, sizeof(old_aperf), 0xe8);
+
+ for (i=0; i<0x8fffffff; i++) {
+ sqrt(i);
+ }
+
+ ftime(&after);
+ pread(fd, &new_tsc, sizeof(new_tsc), 0x10);
+ pread(fd, &new_aperf, sizeof(new_mperf), 0xe7);
+ pread(fd, &new_mperf, sizeof(new_aperf), 0xe8);
+
+ tsc = new_tsc-old_tsc;
+ aperf = new_aperf-old_aperf;
+ mperf = new_mperf-old_mperf;
+
+ start = before.time*1000 + before.millitm;
+ finish = after.time*1000 + after.millitm;
+ total = finish - start;
+
+ printf("runTime: %4.2f\n", 1.0*total/1000);
+ printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
+ return 0;
+}
diff --git a/tools/testing/selftests/intel_pstate/msr.c b/tools/testing/selftests/intel_pstate/msr.c
new file mode 100644
index 0000000..abbbfc8
--- /dev/null
+++ b/tools/testing/selftests/intel_pstate/msr.c
@@ -0,0 +1,39 @@
+#include <math.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/timeb.h>
+#include <sched.h>
+#include <errno.h>
+
+
+int main(int argc, char **argv) {
+ int cpu, fd;
+ long long msr;
+ char msr_file_name[64];
+
+ if (argc != 2)
+ return 1;
+
+ errno = 0;
+ cpu = strtol(argv[1], (char **) NULL, 10);
+
+ if (errno)
+ return 1;
+
+ sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
+ fd = open(msr_file_name, O_RDONLY);
+
+ if (fd == -1) {
+ perror("Failed to open");
+ return 1;
+ }
+
+ pread(fd, &msr, sizeof(msr), 0x199);
+
+ printf("msr 0x199: 0x%llx\n", msr);
+ return 0;
+}
diff --git a/tools/testing/selftests/intel_pstate/run.sh b/tools/testing/selftests/intel_pstate/run.sh
new file mode 100755
index 0000000..bdaf37e
--- /dev/null
+++ b/tools/testing/selftests/intel_pstate/run.sh
@@ -0,0 +1,113 @@
+#!/bin/bash
+#
+# This test runs on Intel x86 based hardware which support the intel_pstate
+# driver. The test checks the frequency settings from the maximum turbo
+# state to the minimum supported frequency, in decrements of 100MHz. The
+# test runs the aperf.c program to put load on each processor.
+#
+# The results are displayed in a table which indicate the "Target" state,
+# or the requested frequency in MHz, the Actual frequency, as read from
+# /proc/cpuinfo, the difference between the Target and Actual frequencies,
+# and the value of MSR 0x199 (MSR_IA32_PERF_CTL) which indicates what
+# pstate the cpu is in, and the value of
+# /sys/devices/system/cpu/intel_pstate/max_perf_pct X maximum turbo state
+#
+# Notes: In some cases several frequency values may be placed in the
+# /tmp/result.X files. This is done on purpose in order to catch cases
+# where the pstate driver may not be working at all. There is the case
+# where, for example, several "similar" frequencies are in the file:
+#
+#
+#/tmp/result.3100:1:cpu MHz : 2899.980
+#/tmp/result.3100:2:cpu MHz : 2900.000
+#/tmp/result.3100:3:msr 0x199: 0x1e00
+#/tmp/result.3100:4:max_perf_pct 94
+#
+# and the test will error out in those cases. The result.X file can be checked
+# for consistency and modified to remove the extra MHz values. The result.X
+# files can be re-evaluated by setting EVALUATE_ONLY to 1 below.
+
+EVALUATE_ONLY=0
+
+max_cpus=$(($(nproc)-1))
+
+# compile programs
+gcc -o aperf aperf.c -lm
+[ $? -ne 0 ] && echo "Problem compiling aperf.c." && exit 1
+gcc -o msr msr.c -lm
+[ $? -ne 0 ] && echo "Problem compiling msr.c." && exit 1
+
+function run_test () {
+
+ file_ext=$1
+ for cpu in `seq 0 $max_cpus`
+ do
+ echo "launching aperf load on $cpu"
+ ./aperf $cpu &
+ done
+
+ echo "sleeping for 5 seconds"
+ sleep 5
+ num_freqs=$(cat /proc/cpuinfo | grep MHz | sort -u | wc -l)
+ if [ $num_freqs -le 2 ]; then
+ cat /proc/cpuinfo | grep MHz | sort -u | tail -1 > /tmp/result.$1
+ else
+ cat /proc/cpuinfo | grep MHz | sort -u > /tmp/result.$1
+ fi
+ ./msr 0 >> /tmp/result.$1
+
+ max_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/max_perf_pct)
+ echo "max_perf_pct $max_perf_pct" >> /tmp/result.$1
+
+ for job in `jobs -p`
+ do
+ echo "waiting for job id $job"
+ wait $job
+ done
+}
+
+#
+# MAIN (ALL UNITS IN MHZ)
+#
+
+# Get the marketing frequency
+_mkt_freq=$(cat /proc/cpuinfo | grep -m 1 "model name" | awk '{print $NF}')
+_mkt_freq=$(echo $_mkt_freq | tr -d [:alpha:][:punct:])
+mkt_freq=${_mkt_freq}0
+
+# Get the ranges from cpupower
+_min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ')
+min_freq=$(($_min_freq / 1000))
+_max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ')
+max_freq=$(($_max_freq / 1000))
+
+
+for freq in `seq $max_freq -100 $min_freq`
+do
+ echo "Setting maximum frequency to $freq"
+ cpupower frequency-set -g powersave --max=${freq}MHz >& /dev/null
+ [ $EVALUATE_ONLY -eq 0 ] && run_test $freq
+done
+
+echo "=============================================================================="
+
+echo "The marketing frequency of the cpu is $mkt_freq MHz"
+echo "The maximum frequency of the cpu is $max_freq MHz"
+echo "The minimum frequency of the cpu is $min_freq MHz"
+
+cpupower frequency-set -g powersave --max=${max_freq}MHz >& /dev/null
+
+# make a pretty table
+echo "Target Actual Difference MSR(0x199) max_perf_pct"
+for freq in `seq $max_freq -100 $min_freq`
+do
+ result_freq=$(cat /tmp/result.${freq} | grep "cpu MHz" | awk ' { print $4 } ' | awk -F "." ' { print $1 } ')
+ msr=$(cat /tmp/result.${freq} | grep "msr" | awk ' { print $3 } ')
+ max_perf_pct=$(cat /tmp/result.${freq} | grep "max_perf_pct" | awk ' { print $2 } ' )
+ if [ $result_freq -eq $freq ]; then
+ echo " $freq $result_freq 0 $msr $(($max_perf_pct*3300))"
+ else
+ echo " $freq $result_freq $(($result_freq-$freq)) $msr $(($max_perf_pct*$max_freq))"
+ fi
+done
+exit 0
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