@@ -16576,6 +16576,7 @@ 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>
@@ -59,6 +59,7 @@ TARGETS += net/mptcp
TARGETS += net/openvswitch
TARGETS += netfilter
TARGETS += nsfs
+TARGETS += pcie_bwctrl
TARGETS += perf_events
TARGETS += pidfd
TARGETS += pid_namespace
new file mode 100644
@@ -0,0 +1,2 @@
+TEST_PROGS = set_pcie_cooling_state.sh
+include ../lib.mk
new file mode 100755
@@ -0,0 +1,122 @@
+#!/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
new file mode 100755
@@ -0,0 +1,67 @@
+#!/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
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 bus 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. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> --- MAINTAINERS | 1 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/pcie_bwctrl/Makefile | 2 + .../pcie_bwctrl/set_pcie_cooling_state.sh | 122 ++++++++++++++++++ .../selftests/pcie_bwctrl/set_pcie_speed.sh | 67 ++++++++++ 5 files changed, 193 insertions(+) create mode 100644 tools/testing/selftests/pcie_bwctrl/Makefile create mode 100755 tools/testing/selftests/pcie_bwctrl/set_pcie_cooling_state.sh create mode 100755 tools/testing/selftests/pcie_bwctrl/set_pcie_speed.sh