Mesh_westfirst.py revision 13731
1# Copyright (c) 2010 Advanced Micro Devices, Inc. 2# 2016 Georgia Institute of Technology 3# All rights reserved. 4# 5# Redistribution and use in source and binary forms, with or without 6# modification, are permitted provided that the following conditions are 7# met: redistributions of source code must retain the above copyright 8# notice, this list of conditions and the following disclaimer; 9# redistributions in binary form must reproduce the above copyright 10# notice, this list of conditions and the following disclaimer in the 11# documentation and/or other materials provided with the distribution; 12# neither the name of the copyright holders nor the names of its 13# contributors may be used to endorse or promote products derived from 14# this software without specific prior written permission. 15# 16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27# 28# Authors: Brad Beckmann 29# Tushar Krishna 30 31from m5.params import * 32from m5.objects import * 33 34from BaseTopology import SimpleTopology 35 36# Creates a generic Mesh assuming an equal number of cache 37# and directory controllers. 38# West-first routing is enforced (using link weights) 39# to guarantee deadlock freedom. 40# The network randomly chooses between links with the same 41# weight for messages within unordered virtual networks. 42# Within ordered virtual networks, a fixed link direction 43# is always chosen based on which appears first inside the 44# routing table. 45 46class Mesh_westfirst(SimpleTopology): 47 description='Mesh_westfirst' 48 49 def __init__(self, controllers): 50 self.nodes = controllers 51 52 # Makes a generic mesh 53 # assuming an equal number of cache and directory cntrls 54 55 def makeTopology(self, options, network, IntLink, ExtLink, Router): 56 nodes = self.nodes 57 58 num_routers = options.num_cpus 59 num_rows = options.mesh_rows 60 61 # default values for link latency and router latency. 62 # Can be over-ridden on a per link/router basis 63 link_latency = options.link_latency # used by simple and garnet 64 router_latency = options.router_latency # only used by garnet 65 66 # There must be an evenly divisible number of cntrls to routers 67 # Also, obviously the number or rows must be <= the number of routers 68 cntrls_per_router, remainder = divmod(len(nodes), num_routers) 69 assert(num_rows > 0 and num_rows <= num_routers) 70 num_columns = int(num_routers / num_rows) 71 assert(num_columns * num_rows == num_routers) 72 73 # Create the routers in the mesh 74 routers = [Router(router_id=i, latency=router_latency) \ 75 for i in range(num_routers)] 76 network.routers = routers 77 78 # link counter to set unique link ids 79 link_count = 0 80 81 # Add all but the remainder nodes to the list of nodes to be uniformly 82 # distributed across the network. 83 network_nodes = [] 84 remainder_nodes = [] 85 for node_index in range(len(nodes)): 86 if node_index < (len(nodes) - remainder): 87 network_nodes.append(nodes[node_index]) 88 else: 89 remainder_nodes.append(nodes[node_index]) 90 91 # Connect each node to the appropriate router 92 ext_links = [] 93 for (i, n) in enumerate(network_nodes): 94 cntrl_level, router_id = divmod(i, num_routers) 95 assert(cntrl_level < cntrls_per_router) 96 ext_links.append(ExtLink(link_id=link_count, ext_node=n, 97 int_node=routers[router_id], 98 latency = link_latency)) 99 link_count += 1 100 101 # Connect the remainding nodes to router 0. These should only be 102 # DMA nodes. 103 for (i, node) in enumerate(remainder_nodes): 104 assert(node.type == 'DMA_Controller') 105 assert(i < remainder) 106 ext_links.append(ExtLink(link_id=link_count, ext_node=node, 107 int_node=routers[0], 108 latency = link_latency)) 109 link_count += 1 110 111 network.ext_links = ext_links 112 113 # Create the mesh links. 114 int_links = [] 115 116 # East output to West input links (weight = 2) 117 for row in range(num_rows): 118 for col in range(num_columns): 119 if (col + 1 < num_columns): 120 east_out = col + (row * num_columns) 121 west_in = (col + 1) + (row * num_columns) 122 int_links.append(IntLink(link_id=link_count, 123 src_node=routers[east_out], 124 dst_node=routers[west_in], 125 latency = link_latency, 126 weight=2)) 127 link_count += 1 128 129 # West output to East input links (weight = 1) 130 for row in range(num_rows): 131 for col in range(num_columns): 132 if (col + 1 < num_columns): 133 east_in = col + (row * num_columns) 134 west_out = (col + 1) + (row * num_columns) 135 int_links.append(IntLink(link_id=link_count, 136 src_node=routers[west_out], 137 dst_node=routers[east_in], 138 latency = link_latency, 139 weight=1)) 140 link_count += 1 141 142 143 # North output to South input links (weight = 2) 144 for col in range(num_columns): 145 for row in range(num_rows): 146 if (row + 1 < num_rows): 147 north_out = col + (row * num_columns) 148 south_in = col + ((row + 1) * num_columns) 149 int_links.append(IntLink(link_id=link_count, 150 src_node=routers[north_out], 151 dst_node=routers[south_in], 152 latency = link_latency, 153 weight=2)) 154 link_count += 1 155 156 # South output to North input links (weight = 2) 157 for col in range(num_columns): 158 for row in range(num_rows): 159 if (row + 1 < num_rows): 160 north_in = col + (row * num_columns) 161 south_out = col + ((row + 1) * num_columns) 162 int_links.append(IntLink(link_id=link_count, 163 src_node=routers[south_out], 164 dst_node=routers[north_in], 165 latency = link_latency, 166 weight=2)) 167 link_count += 1 168 169 170 network.int_links = int_links 171