Mesh_XY.py revision 13731:67cd980cb20f
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# XY routing is enforced (using link weights) 39# to guarantee deadlock freedom. 40 41class Mesh_XY(SimpleTopology): 42 description='Mesh_XY' 43 44 def __init__(self, controllers): 45 self.nodes = controllers 46 47 # Makes a generic mesh 48 # assuming an equal number of cache and directory cntrls 49 50 def makeTopology(self, options, network, IntLink, ExtLink, Router): 51 nodes = self.nodes 52 53 num_routers = options.num_cpus 54 num_rows = options.mesh_rows 55 56 # default values for link latency and router latency. 57 # Can be over-ridden on a per link/router basis 58 link_latency = options.link_latency # used by simple and garnet 59 router_latency = options.router_latency # only used by garnet 60 61 62 # There must be an evenly divisible number of cntrls to routers 63 # Also, obviously the number or rows must be <= the number of routers 64 cntrls_per_router, remainder = divmod(len(nodes), num_routers) 65 assert(num_rows > 0 and num_rows <= num_routers) 66 num_columns = int(num_routers / num_rows) 67 assert(num_columns * num_rows == num_routers) 68 69 # Create the routers in the mesh 70 routers = [Router(router_id=i, latency = router_latency) \ 71 for i in range(num_routers)] 72 network.routers = routers 73 74 # link counter to set unique link ids 75 link_count = 0 76 77 # Add all but the remainder nodes to the list of nodes to be uniformly 78 # distributed across the network. 79 network_nodes = [] 80 remainder_nodes = [] 81 for node_index in range(len(nodes)): 82 if node_index < (len(nodes) - remainder): 83 network_nodes.append(nodes[node_index]) 84 else: 85 remainder_nodes.append(nodes[node_index]) 86 87 # Connect each node to the appropriate router 88 ext_links = [] 89 for (i, n) in enumerate(network_nodes): 90 cntrl_level, router_id = divmod(i, num_routers) 91 assert(cntrl_level < cntrls_per_router) 92 ext_links.append(ExtLink(link_id=link_count, ext_node=n, 93 int_node=routers[router_id], 94 latency = link_latency)) 95 link_count += 1 96 97 # Connect the remainding nodes to router 0. These should only be 98 # DMA nodes. 99 for (i, node) in enumerate(remainder_nodes): 100 assert(node.type == 'DMA_Controller') 101 assert(i < remainder) 102 ext_links.append(ExtLink(link_id=link_count, ext_node=node, 103 int_node=routers[0], 104 latency = link_latency)) 105 link_count += 1 106 107 network.ext_links = ext_links 108 109 # Create the mesh links. 110 int_links = [] 111 112 # East output to West input links (weight = 1) 113 for row in range(num_rows): 114 for col in range(num_columns): 115 if (col + 1 < num_columns): 116 east_out = col + (row * num_columns) 117 west_in = (col + 1) + (row * num_columns) 118 int_links.append(IntLink(link_id=link_count, 119 src_node=routers[east_out], 120 dst_node=routers[west_in], 121 src_outport="East", 122 dst_inport="West", 123 latency = link_latency, 124 weight=1)) 125 link_count += 1 126 127 # West output to East input links (weight = 1) 128 for row in range(num_rows): 129 for col in range(num_columns): 130 if (col + 1 < num_columns): 131 east_in = col + (row * num_columns) 132 west_out = (col + 1) + (row * num_columns) 133 int_links.append(IntLink(link_id=link_count, 134 src_node=routers[west_out], 135 dst_node=routers[east_in], 136 src_outport="West", 137 dst_inport="East", 138 latency = link_latency, 139 weight=1)) 140 link_count += 1 141 142 # North output to South input links (weight = 2) 143 for col in range(num_columns): 144 for row in range(num_rows): 145 if (row + 1 < num_rows): 146 north_out = col + (row * num_columns) 147 south_in = col + ((row + 1) * num_columns) 148 int_links.append(IntLink(link_id=link_count, 149 src_node=routers[north_out], 150 dst_node=routers[south_in], 151 src_outport="North", 152 dst_inport="South", 153 latency = link_latency, 154 weight=2)) 155 link_count += 1 156 157 # South output to North input links (weight = 2) 158 for col in range(num_columns): 159 for row in range(num_rows): 160 if (row + 1 < num_rows): 161 north_in = col + (row * num_columns) 162 south_out = col + ((row + 1) * num_columns) 163 int_links.append(IntLink(link_id=link_count, 164 src_node=routers[south_out], 165 dst_node=routers[north_in], 166 src_outport="South", 167 dst_inport="North", 168 latency = link_latency, 169 weight=2)) 170 link_count += 1 171 172 173 network.int_links = int_links 174