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# Copyright (c) 2010 Advanced Micro Devices, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Steve Reinhardt
from m5.params import *
from m5.objects import *
from BaseTopology import SimpleTopology
class Crossbar(SimpleTopology):
description='Crossbar'
def makeTopology(self, options, network, IntLink, ExtLink, Router):
# default values for link latency and router latency.
# Can be over-ridden on a per link/router basis
link_latency = options.link_latency # used by simple and garnet
router_latency = options.router_latency # only used by garnet
# Create an individual router for each controller plus one more for
# the centralized crossbar. The large numbers of routers are needed
# because external links do not model outgoing bandwidth in the
# simple network, but internal links do.
# For garnet, one router suffices, use CrossbarGarnet.py
routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
xbar = routers[len(self.nodes)] # the crossbar router is the last router created
network.routers = routers
ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i],
latency = link_latency)
for (i, n) in enumerate(self.nodes)]
network.ext_links = ext_links
link_count = len(self.nodes)
int_links = []
for i in range(len(self.nodes)):
int_links.append(IntLink(link_id=(link_count+i),
src_node=routers[i],
dst_node=xbar,
latency = link_latency))
link_count += len(self.nodes)
for i in range(len(self.nodes)):
int_links.append(IntLink(link_id=(link_count+i),
src_node=xbar,
dst_node=routers[i],
latency = link_latency))
network.int_links = int_links
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