# 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
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# 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
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Brad Beckmann

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

#
# 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 makeMeshDirCorners(nodes, num_routers, num_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)

    #
    # 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(ext_node=n, int_node=router_id))

    #
    # Connect the dir nodes to the corners.
    #
    ext_links.append(ExtLink(ext_node=dir_nodes[0], int_node=0))
    ext_links.append(ExtLink(ext_node=dir_nodes[1], int_node=(num_columns - 1)))

    ext_links.append(ExtLink(ext_node=dir_nodes[2],
                             int_node=(num_routers - num_columns)))

    ext_links.append(ExtLink(ext_node=dir_nodes[3], int_node=(num_routers - 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(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)