Crossbar.py revision 13774
1# Copyright (c) 2010 Advanced Micro Devices, Inc. 2# All rights reserved. 3# 4# Redistribution and use in source and binary forms, with or without 5# modification, are permitted provided that the following conditions are 6# met: redistributions of source code must retain the above copyright 7# notice, this list of conditions and the following disclaimer; 8# redistributions in binary form must reproduce the above copyright 9# notice, this list of conditions and the following disclaimer in the 10# documentation and/or other materials provided with the distribution; 11# neither the name of the copyright holders nor the names of its 12# contributors may be used to endorse or promote products derived from 13# this software without specific prior written permission. 14# 15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26# 27# Authors: Steve Reinhardt 28 29from __future__ import print_function 30from __future__ import absolute_import 31 32from m5.params import * 33from m5.objects import * 34 35from .BaseTopology import SimpleTopology 36 37class Crossbar(SimpleTopology): 38 description='Crossbar' 39 40 def makeTopology(self, options, network, IntLink, ExtLink, Router): 41 42 # default values for link latency and router latency. 43 # Can be over-ridden on a per link/router basis 44 link_latency = options.link_latency # used by simple and garnet 45 router_latency = options.router_latency # only used by garnet 46 47 # Create an individual router for each controller plus one more for 48 # the centralized crossbar. The large numbers of routers are needed 49 # because external links do not model outgoing bandwidth in the 50 # simple network, but internal links do. 51 # For garnet, one router suffices, use CrossbarGarnet.py 52 53 routers = [Router(router_id=i) for i in range(len(self.nodes)+1)] 54 xbar = routers[len(self.nodes)] # the crossbar router is the last router created 55 network.routers = routers 56 57 ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i], 58 latency = link_latency) 59 for (i, n) in enumerate(self.nodes)] 60 network.ext_links = ext_links 61 62 link_count = len(self.nodes) 63 64 int_links = [] 65 for i in range(len(self.nodes)): 66 int_links.append(IntLink(link_id=(link_count+i), 67 src_node=routers[i], 68 dst_node=xbar, 69 latency = link_latency)) 70 71 link_count += len(self.nodes) 72 73 for i in range(len(self.nodes)): 74 int_links.append(IntLink(link_id=(link_count+i), 75 src_node=xbar, 76 dst_node=routers[i], 77 latency = link_latency)) 78 79 network.int_links = int_links 80