#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
export KSELFTESTS_SKIP=4
log() {
echo >/dev/stderr $*
}
pe_ok() {
local dev="$1"
local path="/sys/bus/pci/devices/$dev/eeh_pe_state"
# if a driver doesn't support the error handling callbacks then the
# device is recovered by removing and re-probing it. This causes the
# sysfs directory to disappear so read the PE state once and squash
# any potential error messages
local eeh_state="$(cat $path 2>/dev/null)"
if [ -z "$eeh_state" ]; then
return 1;
fi
local fw_state="$(echo $eeh_state | cut -d' ' -f1)"
local sw_state="$(echo $eeh_state | cut -d' ' -f2)"
# If EEH_PE_ISOLATED or EEH_PE_RECOVERING are set then the PE is in an
# error state or being recovered. Either way, not ok.
if [ "$((sw_state & 0x3))" -ne 0 ] ; then
return 1
fi
# A functioning PE should have the EEH_STATE_MMIO_ACTIVE and
# EEH_STATE_DMA_ACTIVE flags set. For some goddamn stupid reason
# the platform backends set these when the PE is in reset. The
# RECOVERING check above should stop any false positives though.
if [ "$((fw_state & 0x18))" -ne "$((0x18))" ] ; then
return 1
fi
return 0;
}
eeh_supported() {
test -e /proc/powerpc/eeh && \
grep -q 'EEH Subsystem is enabled' /proc/powerpc/eeh
}
eeh_test_prep() {
if ! eeh_supported ; then
echo "EEH not supported on this system, skipping"
exit $KSELFTESTS_SKIP;
fi
if [ ! -e "/sys/kernel/debug/powerpc/eeh_dev_check" ] && \
[ ! -e "/sys/kernel/debug/powerpc/eeh_dev_break" ] ; then
log "debugfs EEH testing files are missing. Is debugfs mounted?"
exit $KSELFTESTS_SKIP;
fi
# Bump the max freeze count to something absurd so we don't
# trip over it while breaking things.
echo 5000 > /sys/kernel/debug/powerpc/eeh_max_freezes
}
eeh_can_break() {
# skip bridges since we can't recover them (yet...)
if [ -e "/sys/bus/pci/devices/$dev/pci_bus" ] ; then
log "$dev, Skipped: bridge"
return 1;
fi
# The ahci driver doesn't support error recovery. If the ahci device
# happens to be hosting the root filesystem, and then we go and break
# it the system will generally go down. We should probably fix that
# at some point
if [ "ahci" = "$(basename $(realpath /sys/bus/pci/devices/$dev/driver))" ] ; then
log "$dev, Skipped: ahci doesn't support recovery"
return 1;
fi
# Don't inject errosr into an already-frozen PE. This happens with
# PEs that contain multiple PCI devices (e.g. multi-function cards)
# and injecting new errors during the recovery process will probably
# result in the recovery failing and the device being marked as
# failed.
if ! pe_ok $dev ; then
log "$dev, Skipped: Bad initial PE state"
return 1;
fi
return 0
}
eeh_one_dev() {
local dev="$1"
# Using this function from the command line is sometimes useful for
# testing so check that the argument is a well-formed sysfs device
# name.
if ! test -e /sys/bus/pci/devices/$dev/ ; then
log "Error: '$dev' must be a sysfs device name (DDDD:BB:DD.F)"
return 1;
fi
# Break it
echo $dev >/sys/kernel/debug/powerpc/eeh_dev_break
# Force an EEH device check. If the kernel has already
# noticed the EEH (due to a driver poll or whatever), this
# is a no-op.
echo $dev >/sys/kernel/debug/powerpc/eeh_dev_check
# Default to a 60s timeout when waiting for a device to recover. This
# is an arbitrary default which can be overridden by setting the
# EEH_MAX_WAIT environmental variable when required.
# The current record holder for longest recovery time is:
# "Adaptec Series 8 12G SAS/PCIe 3" at 39 seconds
max_wait=${EEH_MAX_WAIT:=60}
for i in `seq 0 ${max_wait}` ; do
if pe_ok $dev ; then
break;
fi
log "$dev, waited $i/${max_wait}"
sleep 1
done
if ! pe_ok $dev ; then
log "$dev, Failed to recover!"
return 1;
fi
log "$dev, Recovered after $i seconds"
return 0;
}
eeh_has_driver() {
test -e /sys/bus/pci/devices/$1/driver;
return $?
}
eeh_can_recover() {
# we'll get an IO error if the device's current driver doesn't support
# error recovery
echo $1 > '/sys/kernel/debug/powerpc/eeh_dev_can_recover' 2>/dev/null
return $?
}
eeh_find_all_pfs() {
devices=""
# SR-IOV on pseries requires hypervisor support, so check for that
is_pseries=""
if grep -q pSeries /proc/cpuinfo ; then
if [ ! -f /proc/device-tree/rtas/ibm,open-sriov-allow-unfreeze ] ||
[ ! -f /proc/device-tree/rtas/ibm,open-sriov-map-pe-number ] ; then
return 1;
fi
is_pseries="true"
fi
for dev in `ls -1 /sys/bus/pci/devices/` ; do
sysfs="/sys/bus/pci/devices/$dev"
if [ ! -e "$sysfs/sriov_numvfs" ] ; then
continue
fi
# skip unsupported PFs on pseries
if [ -z "$is_pseries" ] &&
[ ! -f "$sysfs/of_node/ibm,is-open-sriov-pf" ] &&
[ ! -f "$sysfs/of_node/ibm,open-sriov-vf-bar-info" ] ; then
continue;
fi
# no driver, no vfs
if ! eeh_has_driver $dev ; then
continue
fi
devices="$devices $dev"
done
if [ -z "$devices" ] ; then
return 1;
fi
echo $devices
return 0;
}
# attempts to enable one VF on each PF so we can do VF specific tests.
# stdout: list of enabled VFs, one per line
# return code: 0 if vfs are found, 1 otherwise
eeh_enable_vfs() {
pf_list="$(eeh_find_all_pfs)"
vfs=0
for dev in $pf_list ; do
pf_sysfs="/sys/bus/pci/devices/$dev"
# make sure we have a single VF
echo 0 > "$pf_sysfs/sriov_numvfs"
echo 1 > "$pf_sysfs/sriov_numvfs"
if [ "$?" != 0 ] ; then
log "Unable to enable VFs on $pf, skipping"
continue;
fi
vf="$(basename $(realpath "$pf_sysfs/virtfn0"))"
if [ $? != 0 ] ; then
log "unable to find enabled vf on $pf"
echo 0 > "$pf_sysfs/sriov_numvfs"
continue;
fi
if ! eeh_can_break $vf ; then
log "skipping "
echo 0 > "$pf_sysfs/sriov_numvfs"
continue;
fi
vfs="$((vfs + 1))"
echo $vf
done
test "$vfs" != 0
return $?
}
eeh_disable_vfs() {
pf_list="$(eeh_find_all_pfs)"
if [ -z "$pf_list" ] ; then
return 1;
fi
for dev in $pf_list ; do
echo 0 > "/sys/bus/pci/devices/$dev/sriov_numvfs"
done
return 0;
}
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