cputopology: add arm capacity calculation test

Add test which verifies capacity calculation on arm
architecture platforms.

This will work on any platform that uses parse_dt_topology() arch hook
to set cpu capacity. Currently only arm (not arm64) platforms do this.

Signed-off-by: Larry Bassel <larry.bassel@linaro.org>
Acked-by: Vincent Guittot <vincent.guittot@linaro.org>

2 files changed, 136 insertions, 0 deletions

diff --git a/cputopology/cputopology_04.sh b/cputopology/cputopology_04.sh
new file mode 100755
index 0000000..e728c3f
--- /dev/null
+++ b/cputopology/cputopology_04.sh
@@ -0,0 +1,131 @@
+#!/bin/sh
+#
+# PM-QA validation test suite for the power management on Linux
+#
+# Copyright (C) 2015, Linaro Limited.
+#
+# 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# Contributors:
+#     Larry Bassel <larry.bassel@linaro.org>
+#
+
+# URL : https://wiki.linaro.org/WorkingGroups/PowerManagement/Resources/TestSuite/PmQaSpecification#cputopology_04
+
+. ../include/functions.sh
+
+calc_freq()
+{
+    byte1=$1
+    byte2=$2
+    byte3=$3
+    byte4=$4
+    freq=$((byte1*0x1000000+byte2*0x10000+byte3*0x100+byte4))
+}
+
+# eff is the relative cpu efficiency of each processor
+set_eff() {
+    type=$1
+
+    case $type in
+        arm,cortex-a15) eff=3891 ;;
+        arm,cortex-a7)  eff=2048 ;;
+        * ) eff=1024 ;;
+    esac
+}
+
+# Calculate a middle efficiency, This is later used to scale
+# the cpu_capacity such that an 'average' CPU is of middle capacity.
+
+calc_mid_capacity()
+{
+    dt_cpus=$(ls /sys/firmware/devicetree/base/cpus | grep "cpu@[0-9].*")
+    min_capacity=$((0xffffffff))
+    max_capacity=0
+    sched_capacity_shift=10
+
+    for dt_cpu in $dt_cpus; do
+        if [ ! -f /sys/firmware/devicetree/base/cpus/$dt_cpu/clock-frequency ]; then
+           log_skip "no clock frequency file present"
+           return
+        fi
+        if [ ! -f /sys/firmware/devicetree/base/cpus/$dt_cpu/compatible ]; then
+           log_skip "no compatible file present"
+           return
+        fi
+        filename=/sys/firmware/devicetree/base/cpus/$dt_cpu/clock-frequency
+        bytes=$(od -t u1 -A n $filename)
+        calc_freq $bytes
+        cpu_type=$(cat /sys/firmware/devicetree/base/cpus/$dt_cpu/compatible)
+   set_eff $cpu_type
+   capacity=$((($freq>>20)*$eff))
+   if [ $capacity -gt $max_capacity ]; then
+       max_capacity=$capacity
+   fi
+   if [ $capacity -lt $min_capacity ]; then
+       min_capacity=$capacity
+   fi
+        if [ $(((4 * $max_capacity))) -lt $(((3 * ($max_capacity + $min_capacity)))) ]; then
+                middle_capacity=$((($min_capacity + $max_capacity)>>($sched_capacity_shift+1)))
+        else
+                middle_capacity=$(((($max_capacity / 3)>>($sched_capacity_shift-1))+1))
+        fi
+    done
+}
+
+cpu_num=0
+
+verify_cpu_capacity()
+{
+    for dt_cpu in $dt_cpus; do
+        if [ ! -f /sys/firmware/devicetree/base/cpus/$dt_cpu/clock-frequency ]; then
+           log_skip "no clock frequency file present"
+           return
+        fi
+        if [ ! -f /sys/firmware/devicetree/base/cpus/$dt_cpu/compatible ]; then
+           log_skip "no compatible file present"
+           return
+        fi
+        filename=/sys/firmware/devicetree/base/cpus/$dt_cpu/clock-frequency
+        bytes=$(od -t u1 -A n $filename)
+        calc_freq $bytes
+        cpu_type=$(cat /sys/firmware/devicetree/base/cpus/$dt_cpu/compatible)
+   set_eff $cpu_type
+   capacity=$((($freq>>20)*$eff/$middle_capacity))
+   expected_capacity_string=$(dmesg | grep "CPU$cpu_num: update cpu_capacity")
+   expected_capacity=${expected_capacity_string##*cpu_capacity}
+   echo "cpu num: $cpu_num capacity $capacity expected capacity $expected_capacity"
+   check "expected capacity for cpu$cpu_num equal to computed capacity" "test $expected_capacity -eq $capacity"
+
+   cpu_num=$((cpu_num+1))
+    done
+}
+
+verify_capacity()
+{
+    if ! [ -d /sys/firmware/devicetree/base/cpus ]; then
+   log_skip "no cpus directory present"
+       return
+    fi
+
+    calc_mid_capacity
+    dt_cpus=$(ls -1 /sys/firmware/devicetree/base/cpus | egrep "cpu@.{1,2}$")
+    verify_cpu_capacity
+    dt_cpus=$(ls -1 /sys/firmware/devicetree/base/cpus | egrep "cpu@.{3,4}$")
+    verify_cpu_capacity
+}
+
+verify_capacity || exit 1
+test_status_show
diff --git a/cputopology/cputopology_04.txt b/cputopology/cputopology_04.txt
new file mode 100644
index 0000000..2995aab
--- /dev/null
+++ b/cputopology/cputopology_04.txt
@@ -0,0 +1,5 @@
+Test capacity calculation (this is based on
+the algorithm in arch/arm/kernel/topology.c),
+make sure that the information in
+/sys/firmware/devicetree/base/cpus corresponds
+to that reported by the kernel log.