1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0-only 3 4pe_ok() { 5 local dev="$1" 6 local path="/sys/bus/pci/devices/$dev/eeh_pe_state" 7 8 if ! [ -e "$path" ] ; then 9 return 1; 10 fi 11 12 local fw_state="$(cut -d' ' -f1 < $path)" 13 local sw_state="$(cut -d' ' -f2 < $path)" 14 15 # If EEH_PE_ISOLATED or EEH_PE_RECOVERING are set then the PE is in an 16 # error state or being recovered. Either way, not ok. 17 if [ "$((sw_state & 0x3))" -ne 0 ] ; then 18 return 1 19 fi 20 21 # A functioning PE should have the EEH_STATE_MMIO_ACTIVE and 22 # EEH_STATE_DMA_ACTIVE flags set. For some goddamn stupid reason 23 # the platform backends set these when the PE is in reset. The 24 # RECOVERING check above should stop any false positives though. 25 if [ "$((fw_state & 0x18))" -ne "$((0x18))" ] ; then 26 return 1 27 fi 28 29 return 0; 30} 31 32eeh_supported() { 33 test -e /proc/powerpc/eeh && \ 34 grep -q 'EEH Subsystem is enabled' /proc/powerpc/eeh 35} 36 37eeh_one_dev() { 38 local dev="$1" 39 40 # Using this function from the command line is sometimes useful for 41 # testing so check that the argument is a well-formed sysfs device 42 # name. 43 if ! test -e /sys/bus/pci/devices/$dev/ ; then 44 echo "Error: '$dev' must be a sysfs device name (DDDD:BB:DD.F)" 45 return 1; 46 fi 47 48 # Break it 49 echo $dev >/sys/kernel/debug/powerpc/eeh_dev_break 50 51 # Force an EEH device check. If the kernel has already 52 # noticed the EEH (due to a driver poll or whatever), this 53 # is a no-op. 54 echo $dev >/sys/kernel/debug/powerpc/eeh_dev_check 55 56 # Default to a 60s timeout when waiting for a device to recover. This 57 # is an arbitrary default which can be overridden by setting the 58 # EEH_MAX_WAIT environmental variable when required. 59 60 # The current record holder for longest recovery time is: 61 # "Adaptec Series 8 12G SAS/PCIe 3" at 39 seconds 62 max_wait=${EEH_MAX_WAIT:=60} 63 64 for i in `seq 0 ${max_wait}` ; do 65 if pe_ok $dev ; then 66 break; 67 fi 68 echo "$dev, waited $i/${max_wait}" 69 sleep 1 70 done 71 72 if ! pe_ok $dev ; then 73 echo "$dev, Failed to recover!" 74 return 1; 75 fi 76 77 echo "$dev, Recovered after $i seconds" 78 return 0; 79} 80 81