[PATCH v2] cpufreq: tests: Providing cpufreq regression test

[Lukasz Majewski]

This commit adds first regression test "cpufreq_freq_test.sh" for the
cpufreq subsystem.

Signed-off-by: Lukasz Majewski <l.majewski at samsung.com>

---
Changes for v2:
- Replace *_PATCH with *_PATH for variables names
- Corrected mistakes in the README file
- Providing detailed explanation of the patch in the README file
---
 drivers/cpufreq/tests/README               |  33 +++++++
 drivers/cpufreq/tests/cpufreq_freq_test.sh | 149 +++++++++++++++++++++++++++++
 2 files changed, 182 insertions(+)
 create mode 100644 drivers/cpufreq/tests/README
 create mode 100755 drivers/cpufreq/tests/cpufreq_freq_test.sh

diff --git a/drivers/cpufreq/tests/README b/drivers/cpufreq/tests/README
new file mode 100644
index 0000000..3e9cd80
--- /dev/null
+++ b/drivers/cpufreq/tests/README
@@ -0,0 +1,33 @@
+This file contains list of cpufreq's available regression tests with a short
+usage description.
+
+1. cpufreq_freq_test.sh
+
+Description:
+------------
+This script is supposed to test if cpufreq attributes exported by sysfs are
+exposing correct values.
+
+To achieve this goal it saves the current governor and changes it to
+"performance". Afterwards, it reads the "scaling_available_frequencies"
+property. With the list of supported frequencies it is able to enforce each of
+them by writing to "scaling_max_freq" attribute. To make the test more reliable
+a superfluous load with gzip is created to be sure that we are running with
+highest possible frequency. This high load is regulated with the 'sleep'
+duration. After this time the "cpufreq_cur_freq" is read and compared with the
+original value. As the last step the original governor is restored.
+
+This script can work with or without BOOST enabled and helps in spotting errors
+related to cpufreq and common clock framework.
+
+Used attributes:
+----------------
+- "scaling_available_frequencies"
+- "cpuinfo_cur_freq"
+- "scaling_governor"
+- "scaling_max_freq"
+
+Target devices:
+---------------
+
+All devices which exports mentioned above sysfs attributes.
\ No newline at end of file
diff --git a/drivers/cpufreq/tests/cpufreq_freq_test.sh b/drivers/cpufreq/tests/cpufreq_freq_test.sh
new file mode 100755
index 0000000..c25f05c
--- /dev/null
+++ b/drivers/cpufreq/tests/cpufreq_freq_test.sh
@@ -0,0 +1,149 @@
+#!/bin/bash
+#
+# This file provides a simple mean to test if all declared freqs at
+# "scaling_available_frequencies" can be set and if "cpuinfo_cur_freq"
+# returns this value.
+#
+# Usage: ./cpufreq_freq_test.sh
+# Requisite: Compiled in "performance" governor
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, you can access it online at
+# http://www.gnu.org/licenses/gpl-2.0.html.
+#
+# Copyright (C) Samsung Electronics, 2014
+#
+# Author: Lukasz Majewski <l.majewski at samsung.com>
+
+set +x
+
+COLOUR_RED="\33[31m"
+COLOUR_BLUE="\33[34m"
+COLOUR_GREEN="\33[32m"
+COLOUR_DEFAULT="\33[0m"
+
+T_PATH=/sys/devices/system/cpu/cpu0/cpufreq
+BOOST_PATH=/sys/devices/system/cpu/cpufreq
+
+if [ ! -d "$T_PATH" ]; then
+    printf "   $COLOUR_RED No path to CPUFREQ $COLOUR_DEFAULT\n"
+    exit 1
+fi
+
+ERRORS=0
+
+OLD_GOV=`cat $T_PATH/scaling_governor`
+echo "CURRENT GOVERNOR: $OLD_GOV"
+echo "SET GOVERNOR: performance"
+echo "performance" > $T_PATH/scaling_governor
+
+function test_freqs1 {
+    FREQS=`cat $1`
+    for I in $FREQS; do
+	cpufreq_set_freq $I
+	if [ "$2" ]; then
+	    printf "$COLOUR_BLUE BOOST $COLOUR_DEFAULT" $I
+	fi
+	cpufreq_test_freq $I
+    done
+}
+
+function test_freqs2 {
+    FREQ=`cat $1`
+    FREQS_ARRAY=($FREQ)
+
+    for freq in ${FREQS_ARRAY[@]}
+    do
+	echo "REFERENCE FREQ: $freq"
+	for f in ${FREQS_ARRAY[@]}
+	do
+	    cpufreq_set_freq $freq
+	    echo -n "----> "
+	    cpufreq_set_freq $f
+	    cpufreq_test_freq $f
+	done
+    done
+}
+
+function restore {
+    if [ -f $BOOST_PATH/boost ]; then
+	cpufreq_boost_state $BOOST_STATE
+    fi
+
+    echo "SET GOVERNOR: $OLD_GOV"
+    echo $OLD_GOV > $T_PATH/scaling_governor
+}
+
+function die {
+    printf "   $COLOUR_RED FAILED $COLOUR_DEFAULT\n"
+    restore_gov
+    exit 1
+}
+
+function cpufreq_test_freq {
+    gzip < /dev/urandom > /dev/null &
+    pid=$!
+    sleep 0.1
+    CURR_FREQ=`cat $T_PATH/cpuinfo_cur_freq`
+    if [ $1 -eq $CURR_FREQ ]; then
+	printf "\t$COLOUR_GREEN OK $COLOUR_DEFAULT\n"
+    else
+	printf "$COLOUR_RED CURRENT $CURR_FREQ $COLOUR_DEFAULT\n"
+	ERRORS=`expr $ERRORS + 1`
+	#die
+    fi
+    kill -9 $pid
+    wait $! 2>/dev/null
+}
+
+function cpufreq_set_freq {
+    echo $1 > $T_PATH/scaling_max_freq || die $?
+    printf "FREQ:$COLOUR_GREEN %s $COLOUR_DEFAULT" $1
+}
+
+function cpufreq_boost_state {
+   echo $1 > $BOOST_PATH/boost
+}
+
+function cpufreq_boost_status {
+   cat $BOOST_PATH/boost
+}
+
+if [ -f $BOOST_PATH/boost ]; then
+    echo "######################################"
+    echo "TEST BOOST OPERATION"
+    echo "######################################"
+
+    BOOST_STATE=$(cpufreq_boost_status)
+    if [ $BOOST_STATE -eq 0 ]; then
+	cpufreq_boost_state 1
+    fi
+    test_freqs1 $T_PATH/scaling_boost_frequencies 1
+fi
+
+echo "######################################"
+echo "TEST AVAILABLE FREQS"
+echo "######################################"
+test_freqs1 $T_PATH/scaling_available_frequencies
+
+echo "######################################"
+echo "TEST FREQS SWITCHING"
+echo "######################################"
+test_freqs2 $T_PATH/scaling_available_frequencies
+
+echo "######################################"
+echo "ERRORS: $ERRORS"
+echo "######################################"
+
+restore
+exit 0
-- 
2.0.0.rc2