#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0-only
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pe_ok() {
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local dev="$1"
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local path="/sys/bus/pci/devices/$dev/eeh_pe_state"
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# if a driver doesn't support the error handling callbacks then the
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# device is recovered by removing and re-probing it. This causes the
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# sysfs directory to disappear so read the PE state once and squash
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# any potential error messages
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local eeh_state="$(cat $path 2>/dev/null)"
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if [ -z "$eeh_state" ]; then
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return 1;
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fi
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local fw_state="$(echo $eeh_state | cut -d' ' -f1)"
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local sw_state="$(echo $eeh_state | cut -d' ' -f2)"
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# If EEH_PE_ISOLATED or EEH_PE_RECOVERING are set then the PE is in an
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# error state or being recovered. Either way, not ok.
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if [ "$((sw_state & 0x3))" -ne 0 ] ; then
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return 1
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fi
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# A functioning PE should have the EEH_STATE_MMIO_ACTIVE and
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# EEH_STATE_DMA_ACTIVE flags set. For some goddamn stupid reason
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# the platform backends set these when the PE is in reset. The
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# RECOVERING check above should stop any false positives though.
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if [ "$((fw_state & 0x18))" -ne "$((0x18))" ] ; then
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return 1
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fi
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return 0;
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}
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eeh_supported() {
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test -e /proc/powerpc/eeh && \
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grep -q 'EEH Subsystem is enabled' /proc/powerpc/eeh
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}
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eeh_one_dev() {
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local dev="$1"
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# Using this function from the command line is sometimes useful for
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# testing so check that the argument is a well-formed sysfs device
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# name.
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if ! test -e /sys/bus/pci/devices/$dev/ ; then
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echo "Error: '$dev' must be a sysfs device name (DDDD:BB:DD.F)"
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return 1;
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fi
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# Break it
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echo $dev >/sys/kernel/debug/powerpc/eeh_dev_break
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# Force an EEH device check. If the kernel has already
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# noticed the EEH (due to a driver poll or whatever), this
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# is a no-op.
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echo $dev >/sys/kernel/debug/powerpc/eeh_dev_check
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# Default to a 60s timeout when waiting for a device to recover. This
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# is an arbitrary default which can be overridden by setting the
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# EEH_MAX_WAIT environmental variable when required.
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# The current record holder for longest recovery time is:
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# "Adaptec Series 8 12G SAS/PCIe 3" at 39 seconds
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max_wait=${EEH_MAX_WAIT:=60}
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for i in `seq 0 ${max_wait}` ; do
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if pe_ok $dev ; then
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break;
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fi
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echo "$dev, waited $i/${max_wait}"
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sleep 1
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done
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if ! pe_ok $dev ; then
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echo "$dev, Failed to recover!"
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return 1;
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fi
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echo "$dev, Recovered after $i seconds"
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return 0;
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}
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