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|
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-or-later
SYSFS=
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
retval=0
skipmsg="skip all tests:"
PCIEPORTTYPE="PCIe_Port_Link_Speed"
prerequisite()
{
local ports
if [ $UID != 0 ]; then
echo $skipmsg must be run as root >&2
exit $ksft_skip
fi
SYSFS=`mount -t sysfs | head -1 | awk '{ print $3 }'`
if [ ! -d "$SYSFS" ]; then
echo $skipmsg sysfs is not mounted >&2
exit $ksft_skip
fi
if ! ls $SYSFS/class/thermal/cooling_device* > /dev/null 2>&1; then
echo $skipmsg thermal cooling devices missing >&2
exit $ksft_skip
fi
ports=`grep -e "^$PCIEPORTTYPE" $SYSFS/class/thermal/cooling_device*/type | wc -l`
if [ $ports -eq 0 ]; then
echo $skipmsg pcie cooling devices missing >&2
exit $ksft_skip
fi
}
testport=
find_pcie_port()
{
local patt="$1"
local pcieports
local max
local cur
local delta
local bestdelta=-1
pcieports=`grep -l -F -e "$patt" /sys/class/thermal/cooling_device*/type`
if [ -z "$pcieports" ]; then
return
fi
pcieports=${pcieports//\/type/}
# Find the port with the highest PCIe Link Speed
for port in $pcieports; do
max=`cat $port/max_state`
cur=`cat $port/cur_state`
delta=$((max-cur))
if [ $delta -gt $bestdelta ]; then
testport="$port"
bestdelta=$delta
fi
done
}
sysfspcidev=
find_sysfs_pci_dev()
{
local typefile="$1/type"
local pcidir
pcidir="$SYSFS/bus/pci/devices/`sed -e "s|^${PCIEPORTTYPE}_||g" $typefile`"
if [ -r "$pcidir/current_link_speed" ]; then
sysfspcidev="$pcidir/current_link_speed"
fi
}
usage()
{
echo "Usage $0 [ -d dev ]"
echo -e "\t-d: PCIe port BDF string (e.g., 0000:00:04.0)"
}
pattern="$PCIEPORTTYPE"
parse_arguments()
{
while getopts d:h opt; do
case $opt in
h)
usage "$0"
exit 0
;;
d)
pattern="$PCIEPORTTYPE_$OPTARG"
;;
*)
usage "$0"
exit 0
;;
esac
done
}
parse_arguments "$@"
prerequisite
find_pcie_port "$pattern"
if [ -z "$testport" ]; then
echo $skipmsg "pcie cooling device not found from sysfs" >&2
exit $ksft_skip
fi
find_sysfs_pci_dev "$testport"
if [ -z "$sysfspcidev" ]; then
echo $skipmsg "PCIe port device not found from sysfs" >&2
exit $ksft_skip
fi
./set_pcie_speed.sh "$testport" "$sysfspcidev"
retval=$?
exit $retval
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