#!/usr/bin/env python
#  -*- mode: python; -*-
#============================================================================
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#============================================================================
# Copyright (c) 2009, NEC Corporation.
#============================================================================
# This script converts SBDF into device path.
#   'SBDF' format is "[SEG#:]BUS#:DEV#.FUNC#"
#       ex) 0000:0a:1f.3
#   Device path format is "HID[:UID]-DEV#.FUNC#[-DEV#.FUNC#[...]]"
#       ex) PNP0A08:0-2.0-0.0
#=============================================================================

import sys
import os

# add fallback path for non-native python path installs if needed
sys.path.append('/usr/lib/python')
sys.path.append('/usr/lib64/python')
from xen.util.pci import *

SYSFS_ACPI_DEVS_PATH = '/firmware/acpi/namespace/ACPI/_SB'

def find_hid_uid(dom, b, d, f):
    obj_list = os.listdir(sb_path)
    for obj in obj_list:
        obj_path = sb_path + '/' + obj.strip() + '/'
        if os.path.exists(obj_path + 'seg') and \
            os.path.exists(obj_path + 'bbn'):
            seg = open(obj_path + 'seg').read()
            bbn = open(obj_path + 'bbn').read()
            if int(seg) == dom and int(bbn) == b:
                hid = open(obj_path + 'hid').read()
                if os.path.exists(obj_path + 'uid') is False:
                    path_str = hid.strip()
                else:
                    uid = open(obj_path + 'uid').read()
                    path_str = hid.strip() + ':' + uid.strip()
                return path_str
    return None

def make_device_path(dom, b, d, f):
    dev = PciDevice(dom, b, d, f)
    parent = dev.find_parent()
    if parent is None:
        path_str = find_hid_uid(dom, b, d, f)
        path_str = path_str + '-' + hex(d).replace('0x', '') + '.' + \
            hex(f).replace('0x', '')
        return path_str
    (pdom, pb, pd, pf) = parent
    path_str = make_device_path(pdom, pb, pd, pf)
    path_str = path_str + '-' + hex(d).replace('0x', '') + '.' + \
        hex(f).replace('0x', '')
    return path_str

# main
if len(sys.argv) <> 2:
    print 'Usage: sbdf2devicepath SBDF\n'
else:
    sb_path = find_sysfs_mnt() + SYSFS_ACPI_DEVS_PATH
    if os.path.exists(sb_path):
        path = os.environ['PATH']
        os.environ['PATH'] = path + ':/sbin' + ':/user/sbin'
        sbdf = sys.argv[1]
        (dom, b, d, f) = parse_pci_name(sbdf)
        path_str = make_device_path(dom, b, d, f)
        print path_str
    else:
        print sb_path + ' not found.\n'
        print 'This command is only for linux 2.6.18.8 xen kernel.\n'