OSCL-LXR linux-6.0.1/​tools/​testing/​selftests/​powerpc/​eeh/​eeh-functions.sh	Source navigation Diff markup Identifier search General search
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 #!/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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