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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
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_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
echo "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 $dev ; then
break;
fi
echo "$dev, waited $i/${max_wait}"
sleep 1
done
if ! pe_ok $dev ; then
echo "$dev, Failed to recover!"
return 1;
fi
echo "$dev, Recovered after $i seconds"
return 0;
}
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