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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: Brad Beckmann
from m5.params import *
from m5.objects import *
#
# Makes a generic mesh assuming an equal number of cache and directory cntrls
#
def makeTopology(nodes, options):
num_routers = options.num_cpus
num_rows = options.mesh_rows
#
# There must be an evenly divisible number of cntrls to routers
# Also, obviously the number or rows must be <= the number of routers
#
cntrls_per_router, remainder = divmod(len(nodes), num_routers)
assert(num_rows <= num_routers)
num_columns = int(num_routers / num_rows)
assert(num_columns * num_rows == num_routers)
#
# Add all but the remainder nodes to the list of nodes to be uniformly
# distributed across the network.
#
network_nodes = []
remainder_nodes = []
for node_index in xrange(len(nodes)):
if node_index < (len(nodes) - remainder):
network_nodes.append(nodes[node_index])
else:
remainder_nodes.append(nodes[node_index])
#
# Connect each node to the appropriate router
#
ext_links = []
for (i, n) in enumerate(network_nodes):
cntrl_level, router_id = divmod(i, num_routers)
assert(cntrl_level < cntrls_per_router)
ext_links.append(ExtLink(ext_node=n, int_node=router_id))
#
# Connect the remainding nodes to router 0. These should only be DMA nodes.
#
for (i, node) in enumerate(remainder_nodes):
assert(node.type == 'DMA_Controller')
assert(i < remainder)
ext_links.append(ExtLink(ext_node=node, int_node=0))
#
# Create the mesh links. First row (east-west) links then column
# (north-south) links
#
int_links = []
for row in xrange(num_rows):
for col in xrange(num_columns):
if (col + 1 < num_columns):
east_id = col + (row * num_columns)
west_id = (col + 1) + (row * num_columns)
int_links.append(IntLink(node_a=east_id,
node_b=west_id,
weight=1))
for col in xrange(num_columns):
for row in xrange(num_rows):
if (row + 1 < num_rows):
north_id = col + (row * num_columns)
south_id = col + ((row + 1) * num_columns)
int_links.append(IntLink(node_a=north_id,
node_b=south_id,
weight=2))
return Topology(ext_links=ext_links,
int_links=int_links,
num_int_nodes=num_routers)
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