Commit 838f12c3 authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by Bjorn Helgaas
Browse files

selftests/pcie_bwctrl: Create selftests 

Create selftests for PCIe BW control through the PCIe cooling device sysfs
interface.

First, the BW control selftest finds the PCIe Port to test with. By
default, the PCIe Port with the highest Link Speed is selected but
another PCIe Port can be provided with -d parameter.

The actual test steps the cur_state of the cooling device one-by-one
from max_state to what the cur_state was initially. The speed change
is confirmed by observing the current_link_speed for the corresponding
PCIe Port.

Link: https://lore.kernel.org/r/20241018144755.7875-10-ilpo.jarvinen@linux.intel.com


Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent d278b098

MAINTAINERS

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@@ -17940,6 +17940,7 @@ S: Supported 
F:	drivers/pci/pcie/bwctrl.c

F:	drivers/thermal/pcie_cooling.c

F:	include/linux/pci-bwctrl.h

F:	tools/testing/selftests/pcie_bwctrl/









PCIE DRIVER FOR AMAZON ANNAPURNA LABS









M:	Jonathan Chocron <jonnyc@amazon.com>

























tools/testing/selftests/Makefile



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@@ -72,6 +72,7 @@ TARGETS += net/packetdrill







TARGETS += net/rds









TARGETS += net/tcp_ao









TARGETS += nsfs









TARGETS += pcie_bwctrl









TARGETS += perf_events









TARGETS += pidfd









TARGETS += pid_namespace
































tools/testing/selftests/pcie_bwctrl/Makefile
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TEST_PROGS = set_pcie_cooling_state.sh









include ../lib.mk
























tools/testing/selftests/pcie_bwctrl/set_pcie_cooling_state.sh
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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
























tools/testing/selftests/pcie_bwctrl/set_pcie_speed.sh
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#!/bin/bash









# SPDX-License-Identifier: GPL-2.0-or-later



















set -e



















TESTNAME=set_pcie_speed



















declare -a PCIELINKSPEED=(









	"2.5 GT/s PCIe"









	"5.0 GT/s PCIe"









	"8.0 GT/s PCIe"









	"16.0 GT/s PCIe"









	"32.0 GT/s PCIe"









	"64.0 GT/s PCIe"









)



















# Kselftest framework requirement - SKIP code is 4.









ksft_skip=4









retval=0



















coolingdev="$1"









statefile="$coolingdev/cur_state"









maxfile="$coolingdev/max_state"









linkspeedfile="$2"



















oldstate=`cat $statefile`









maxstate=`cat $maxfile`



















set_state()









{









	local state=$1









	local linkspeed









	local expected_linkspeed



















	echo $state > $statefile



















	sleep 1



















	linkspeed="`cat $linkspeedfile`"









	expected_linkspeed=$((maxstate-state))









	expected_str="${PCIELINKSPEED[$expected_linkspeed]}"









	if [ ! "${expected_str}" = "${linkspeed}" ]; then









		echo "$TESTNAME failed: expected: ${expected_str}; got ${linkspeed}"









		retval=1









	fi









}



















cleanup_skip ()









{









	set_state $oldstate









	exit $ksft_skip









}



















trap cleanup_skip EXIT



















echo "$TESTNAME: testing states $maxstate .. $oldstate with $coolingdev"









for i in $(seq $maxstate -1 $oldstate); do









	set_state "$i"









done



















trap EXIT









if [ $retval -eq 0 ]; then









	echo "$TESTNAME [PASS]"









else









	echo "$TESTNAME [FAIL]"









fi









exit $retval