configs/topologies/Crossbar.py

   1 # Copyright (c) 2010 Advanced Micro Devices, Inc.
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  11 # neither the name of the copyright holders nor the names of its
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  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
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  26 #
  27 # Authors: Steve Reinhardt
  28
  29 from m5.params import *
  30 from m5.objects import *
  31
  32 from BaseTopology import SimpleTopology
  33
  34 class Crossbar(SimpleTopology):
  35     description='Crossbar'
  36
  37     def makeTopology(self, options, network, IntLink, ExtLink, Router):
  38
  39         # default values for link latency and router latency.
  40         # Can be over-ridden on a per link/router basis
  41         link_latency = options.link_latency # used by simple and garnet
  42         router_latency = options.router_latency # only used by garnet
  43
  44         # Create an individual router for each controller plus one more for
  45         # the centralized crossbar.  The large numbers of routers are needed
  46         # because external links do not model outgoing bandwidth in the
  47         # simple network, but internal links do.
  48         # For garnet, one router suffices, use CrossbarGarnet.py
  49
  50         routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
  51         xbar = routers[len(self.nodes)] # the crossbar router is the last router created
  52         network.routers = routers
  53
  54         ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i],
  55                              latency = link_latency)
  56                         for (i, n) in enumerate(self.nodes)]
  57         network.ext_links = ext_links
  58
  59         link_count = len(self.nodes)
  60
  61         int_links = []
  62         for i in range(len(self.nodes)):
  63             int_links.append(IntLink(link_id=(link_count+i),
  64                                      src_node=routers[i],
  65                                      dst_node=xbar,
  66                                      latency = link_latency))
  67
  68         link_count += len(self.nodes)
  69
  70         for i in range(len(self.nodes)):
  71             int_links.append(IntLink(link_id=(link_count+i),
  72                                      src_node=xbar,
  73                                      dst_node=routers[i],
  74                                      latency = link_latency))
  75
  76         network.int_links = int_links