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# Copyright (c) 2010 Advanced Micro Devices, Inc.
# All rights reserved.
#
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# 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
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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from m5.params import *
from m5.objects import *
from topologies.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