Quelle  hmi.sh   Sprache: Shell

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright 2015, Daniel Axtens, IBM Corporation
#


# do we have ./getscom, ./putscom?
if [ -x ./getscom ] && [ -x ./putscom ]; then
 GETSCOM=./getscom
 PUTSCOM=./putscom
elif which getscom > /dev/null; then
 GETSCOM=$(which getscom)
 PUTSCOM=$(which putscom)
else
 cat <<EOF
Can't find getscom/putscom in . or \$PATH.
See https://github.com/open-power/skiboot.
The tool is in external/xscom-utils
EOF
 exit 1
fi

# We will get 8 HMI events per injection
# todo: deal with things being offline
expected_hmis=8
COUNT_HMIS() {
    dmesg | grep -c 'Harmless Hypervisor Maintenance interrupt'
}

# massively expand snooze delay, allowing injection on all cores
ppc64_cpu --smt-snooze-delay=1000000000

# when we exit, restore it
trap "ppc64_cpu --smt-snooze-delay=100" 0 1

# for each chip+core combination
# todo - less fragile parsing
grep -E -o 'OCC: Chip [0-9a-f]+ Core [0-9a-f]' < /sys/firmware/opal/msglog |
while read chipcore; do
 chip=$(echo "$chipcore"|awk '{print $3}')
 core=$(echo "$chipcore"|awk '{print $5}')
 fir="0x1${core}013100"

 # verify that Core FIR is zero as expected
 if [ "$($GETSCOM -c 0x${chip} $fir)" != 0 ]; then
  echo "FIR was not zero before injection for chip $chip, core $core. Aborting!"
  echo "Result of $GETSCOM -c 0x${chip} $fir:"
  $GETSCOM -c 0x${chip} $fir
  echo "If you get a -5 error, the core may be in idle state. Try stress-ng."
  echo "Otherwise, try $PUTSCOM -c 0x${chip} $fir 0"
  exit 1
 fi

 # keep track of the number of HMIs handled
 old_hmis=$(COUNT_HMIS)

 # do injection, adding a marker to dmesg for clarity
 echo "Injecting HMI on core $core, chip $chip" | tee /dev/kmsg
 # inject a RegFile recoverable error
 if ! $PUTSCOM -c 0x${chip} $fir 2000000000000000 > /dev/null; then
  echo "Error injecting. Aborting!"
  exit 1
 fi

 # now we want to wait for all the HMIs to be processed
 # we expect one per thread on the core
 i=0;
 new_hmis=$(COUNT_HMIS)
 while [ $new_hmis -lt $((old_hmis + expected_hmis)) ] && [ $i -lt 12 ]; do
     echo "Seen $((new_hmis - old_hmis)) HMI(s) out of $expected_hmis expected, sleeping"
     sleep 5;
     i=$((i + 1))
     new_hmis=$(COUNT_HMIS)
 done
 if [ $i = 12 ]; then
     echo "Haven't seen expected $expected_hmis recoveries after 1 min. Aborting."
     exit 1
 fi
 echo "Processed $expected_hmis events; presumed success. Check dmesg."
 echo ""
done