gem5/configs/topologies/MeshDirCorners.py

# Copyright (c) 2010 Advanced Micro Devices, Inc.
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# Authors: Brad Beckmann

from m5.params import *
from m5.objects import *

from BaseTopology import SimpleTopology

class MeshDirCorners(SimpleTopology):
    description='MeshDirCorners'

    def __init__(self, controllers):
        self.nodes = controllers

    # This file contains a special network creation function.  This
    # networks is not general and will only work with specific system
    # configurations.  The network specified is similar to GEMS old file
    # specified network.

    def makeTopology(self, options, IntLink, ExtLink, Router):
        nodes = self.nodes

        num_routers = options.num_cpus
        num_rows = options.mesh_rows

        # First determine which nodes are cache cntrls vs. dirs vs. dma
        cache_nodes = []
        dir_nodes = []
        dma_nodes = []
        for node in nodes:
            if node.type == 'L1Cache_Controller' or \
            node.type == 'L2Cache_Controller':
                cache_nodes.append(node)
            elif node.type == 'Directory_Controller':
                dir_nodes.append(node)
            elif node.type == 'DMA_Controller':
                dma_nodes.append(node)

        # Obviously the number or rows must be <= the number of routers
        # and evenly divisible.  Also the number of caches must be a
        # multiple of the number of routers and the number of directories
        # must be four.
        assert(num_rows <= num_routers)
        num_columns = int(num_routers / num_rows)
        assert(num_columns * num_rows == num_routers)
        caches_per_router, remainder = divmod(len(cache_nodes), num_routers)
        assert(remainder == 0)
        assert(len(dir_nodes) == 4)

        # Create the routers in the mesh
        routers = [Router(router_id=i) for i in range(num_routers)]

        # link counter to set unique link ids
        link_count = 0

        # Connect each cache controller to the appropriate router
        ext_links = []
        for (i, n) in enumerate(cache_nodes):
            cntrl_level, router_id = divmod(i, num_routers)
            assert(cntrl_level < caches_per_router)
            ext_links.append(ExtLink(link_id=link_count, ext_node=n,
                                    int_node=routers[router_id]))
            link_count += 1

        # Connect the dir nodes to the corners.
        ext_links.append(ExtLink(link_id=link_count, ext_node=dir_nodes[0],
                                int_node=routers[0]))
        link_count += 1
        ext_links.append(ExtLink(link_id=link_count, ext_node=dir_nodes[1],
                                int_node=routers[num_columns - 1]))
        link_count += 1
        ext_links.append(ExtLink(link_id=link_count, ext_node=dir_nodes[2],
                                int_node=routers[num_routers - num_columns]))
        link_count += 1
        ext_links.append(ExtLink(link_id=link_count, ext_node=dir_nodes[3],
                                int_node=routers[num_routers - 1]))
        link_count += 1

        # Connect the dma nodes to router 0.  These should only be DMA nodes.
        for (i, node) in enumerate(dma_nodes):
            assert(node.type == 'DMA_Controller')
            ext_links.append(ExtLink(link_id=link_count, ext_node=node, int_node=routers[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(link_id=link_count,
                                            node_a=routers[east_id],
                                            node_b=routers[west_id],
                                            weight=1))
                    link_count += 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(link_id=link_count,
                                            node_a=routers[north_id],
                                            node_b=routers[south_id],
                                            weight=2))
                    link_count += 1

        return routers, int_links, ext_links