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#!/bin/bash
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
#
# Run an NPU Hardware procedure
#
# Copyright 2016 IBM Corp.
function usage() {
echo -e "$0: run a NPU hardware procedure (requires root)\n"
echo -e "Usage: $0 <PCI bdfn> <procedure number>\n"
echo -e "Example: $0 0008:00:01.1 1"
echo -e "Procedures are documented in skiboot/doc/nvlink.rst"
}
function check_root() {
if [ "$(id -u)" != "0" ]; then
echo -e "Error: $0 must be run as root\n" 1>&2
exit 1
fi
}
function check_args() {
if [ "$#" -eq 0 ]; then
usage
exit 1
fi
if [ "$#" -gt 2 ]; then
echo -e "Error: too many arguments\n" 1>&2
usage
exit 1
fi
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
usage
exit 0
fi
if ! [ "$2" -eq "$2" ] 2>/dev/null; then
echo -e "Procedure must be a decimal number\n" 1>&2
usage
exit 1
fi
if [[ "$2" -lt "0" || "$2" -gt "12" ]]; then
echo -e "Invalid procedure number\n" 1>&2
usage
exit 2
fi
pci_check=$(lspci -s $1)
if [[ $? -ne 0 || $pci_check == "" ]]; then
echo -e "Invalid PCI device\n" 1>&2
usage
exit 2
fi
}
function run_procedure() {
# Convert procedure number into hex
procedure=$(echo "obase=16; $2" | bc)
# Check the status register to make sure we can run a procedure
status=$(setpci -s $1 0x84.L)
if [[ $status == 8000000* ]]; then
echo "Procedure in progress, try again." 1>&2
echo "If that doesn't work, use procedure 0 to abort." 1>&2
exit 3
fi
# Start the procedure
setpci -s $1 0x88.L=0x0000000$procedure >/dev/null
if [ $? -ne 0 ]; then
echo "Control register write failed!" 1>&2
exit 3
fi
iterations=1
while [[ $(setpci -s $1 0x84.L) == 8000000* ]]; do
((iterations++))
done
# Check again, procedure should be finished
status=$(setpci -s $1 0x84.L)
echo "Done in $iterations iteration(s)!"
if [[ $status == 40000000 ]]; then
echo "Procedure completed successfully."
exit 0
elif [[ $status == 40000001 ]]; then
echo "Transient failure, try again." 1>&2
exit 4
elif [[ $status == 40000002 ]]; then
echo "Permanent failure, reboot required?" 1>&2
exit 5
elif [[ $status == 40000003 ]]; then
echo "Procedure aborted." 1>&2
exit 6
elif [[ $status == 40000004 ]]; then
echo "Unsupported procedure." 1>&2
exit 7
fi
}
check_args "$@"
check_root
run_procedure "$1" "$2"
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