Network.py revision 6968:33d2b758697b 
1# Copyright (c) 2009 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#          Brad Beckmann
29
30from m5.params import *
31from m5.SimObject import SimObject
32
33class Link(SimObject):
34    type = 'Link'
35    latency = Param.Int(1, "")
36    bw_multiplier = Param.Int("")
37    weight = Param.Int(1, "")
38
39class ExtLink(Link):
40    type = 'ExtLink'
41    ext_node = Param.RubyController("External node")
42    int_node = Param.Int("ID of internal node")
43    bw_multiplier = 64
44
45class IntLink(Link):
46    type = 'IntLink'
47    node_a = Param.Int("ID of internal node on one end")
48    node_b = Param.Int("ID of internal node on other end")
49    bw_multiplier = 16
50
51class Topology(SimObject):
52    type = 'Topology'
53    ext_links = VectorParam.ExtLink("Links to external nodes")
54    int_links = VectorParam.IntLink("Links between internal nodes")
55    num_int_nodes = Param.Int("Nunber of internal nodes")
56    print_config = Param.Bool(False,
57        "display topology config in the stats file")
58
59def makeCrossbar(nodes):
60    ext_links = [ExtLink(ext_node=n, int_node=i)
61                 for (i, n) in enumerate(nodes)]
62    xbar = len(nodes) # node ID for crossbar switch
63    int_links = [IntLink(node_a=i, node_b=xbar) for i in range(len(nodes))]
64    return Topology(ext_links=ext_links, int_links=int_links,
65                    num_int_nodes=len(nodes)+1)
66
67def makeMesh(nodes, num_routers, num_rows):
68    #
69    # There must be an evenly divisible number of cntrls to routers
70    # Also, obviously the number or rows must be <= the number of routers
71    #
72    cntrls_per_router, remainder = divmod(len(nodes), num_routers)
73    assert(num_rows <= num_routers)
74    num_columns = int(num_routers / num_rows)
75    assert(num_columns * num_rows == num_routers)
76
77    #
78    # Add all but the remainder nodes to the list of nodes to be uniformly
79    # distributed across the network.
80    #
81    network_nodes = []
82    remainder_nodes = []
83    for node_index in xrange(len(nodes)):
84        if node_index < (len(nodes) - remainder):
85            network_nodes.append(nodes[node_index])
86        else:
87            remainder_nodes.append(nodes[node_index])
88
89    #
90    # Connect each node to the appropriate router
91    #
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(ext_node=n, int_node=router_id))
97
98    #
99    # Connect the remainding nodes to router 0.  These should only be DMA nodes.
100    #
101    for (i, node) in enumerate(remainder_nodes):
102        assert(node.type == 'DMA_Controller')
103        assert(i < remainder)
104        ext_links.append(ExtLink(ext_node=node, int_node=0))
105
106    #
107    # Create the mesh links.  First row (east-west) links then column
108    # (north-south) links
109    #
110    int_links = []
111    for row in xrange(num_rows):
112        for col in xrange(num_columns):
113            if (col + 1 < num_columns):
114                east_id = col + (row * num_columns)
115                west_id = (col + 1) + (row * num_columns)
116                int_links.append(IntLink(node_a=east_id,
117                                         node_b=west_id,
118                                         weight=1))
119    for col in xrange(num_columns):
120        for row in xrange(num_rows):
121            if (row + 1 < num_rows):
122                north_id = col + (row * num_columns)
123                south_id = col + ((row + 1) * num_columns)
124                int_links.append(IntLink(node_a=north_id,
125                                         node_b=south_id,
126                                         weight=2))
127
128    return Topology(ext_links=ext_links,
129                    int_links=int_links,
130                    num_int_nodes=num_routers)
131
132class RubyNetwork(SimObject):
133    type = 'RubyNetwork'
134    cxx_class = 'Network'
135    abstract = True
136    number_of_virtual_networks = Param.Int(10, "");
137    topology = Param.Topology("");
138    buffer_size = Param.Int(0,
139        "default buffer size; 0 indicates infinite buffering");
140    endpoint_bandwidth = Param.Int(10000, "");
141    adaptive_routing = Param.Bool(True, "");
142    link_latency = Param.Int(1,
143        "local memory latency ?? NetworkLinkLatency");
144    control_msg_size = Param.Int(8, "");
145