# Copyright (c) 2006-2007 The Regents of The University of Michigan
# Copyright (c) 2009,2015 Advanced Micro Devices, Inc.
# Copyright (c) 2013 Mark D. Hill and David A. Wood
# Copyright (c) 2020 ARM Limited
# 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
# notice, this list of conditions and the following disclaimer in the
# 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
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import math
import m5
from m5.objects import *
from m5.defines import buildEnv
from .Ruby import create_topology, create_directories
from .Ruby import send_evicts
from common import FileSystemConfig

#
# Declare caches used by the protocol
#
class L0Cache(RubyCache): pass
class L1Cache(RubyCache): pass
class L2Cache(RubyCache): pass

def define_options(parser):
    parser.add_option("--num-clusters", type = "int", default = 1,
            help = "number of clusters in a design in which there are shared\
            caches private to clusters")
    parser.add_option("--l0i_size", type="string", default="4096B")
    parser.add_option("--l0d_size", type="string", default="4096B")
    parser.add_option("--l0i_assoc", type="int", default=1)
    parser.add_option("--l0d_assoc", type="int", default=1)
    parser.add_option("--l0_transitions_per_cycle", type="int", default=32)
    parser.add_option("--l1_transitions_per_cycle", type="int", default=32)
    parser.add_option("--l2_transitions_per_cycle", type="int", default=4)
    parser.add_option("--enable-prefetch", action="store_true", default=False,\
                        help="Enable Ruby hardware prefetcher")
    return

def create_system(options, full_system, system, dma_ports, bootmem,
                  ruby_system):

    if buildEnv['PROTOCOL'] != 'MESI_Three_Level':
        fatal("This script requires the MESI_Three_Level protocol to be\
               built.")

    cpu_sequencers = []

    #
    # The ruby network creation expects the list of nodes in the system to be
    # consistent with the NetDest list.  Therefore the l1 controller nodes
    # must be listed before the directory nodes and directory nodes before
    # dma nodes, etc.
    #
    l0_cntrl_nodes = []
    l1_cntrl_nodes = []
    l2_cntrl_nodes = []
    dma_cntrl_nodes = []

    assert (options.num_cpus % options.num_clusters == 0)
    num_cpus_per_cluster = options.num_cpus // options.num_clusters

    assert (options.num_l2caches % options.num_clusters == 0)
    num_l2caches_per_cluster = options.num_l2caches // options.num_clusters

    l2_bits = int(math.log(num_l2caches_per_cluster, 2))
    block_size_bits = int(math.log(options.cacheline_size, 2))
    l2_index_start = block_size_bits + l2_bits

    #
    # Must create the individual controllers before the network to ensure the
    # controller constructors are called before the network constructor
    #
    for i in range(options.num_clusters):
        for j in range(num_cpus_per_cluster):
            #
            # First create the Ruby objects associated with this cpu
            #
            l0i_cache = L0Cache(size = options.l0i_size,
                assoc = options.l0i_assoc,
                is_icache = True,
                start_index_bit = block_size_bits,
                replacement_policy = LRURP())

            l0d_cache = L0Cache(size = options.l0d_size,
                assoc = options.l0d_assoc,
                is_icache = False,
                start_index_bit = block_size_bits,
                replacement_policy = LRURP())

            # the ruby random tester reuses num_cpus to specify the
            # number of cpu ports connected to the tester object, which
            # is stored in system.cpu. because there is only ever one
            # tester object, num_cpus is not necessarily equal to the
            # size of system.cpu; therefore if len(system.cpu) == 1
            # we use system.cpu[0] to set the clk_domain, thereby ensuring
            # we don't index off the end of the cpu list.
            if len(system.cpu) == 1:
                clk_domain = system.cpu[0].clk_domain
            else:
                clk_domain = system.cpu[i].clk_domain

            # Ruby prefetcher
            prefetcher = RubyPrefetcher(
                num_streams=16,
                unit_filter = 256,
                nonunit_filter = 256,
                train_misses = 5,
                num_startup_pfs = 4,
                cross_page = True
            )

            l0_cntrl = L0Cache_Controller(
                   version = i * num_cpus_per_cluster + j,
                   Icache = l0i_cache, Dcache = l0d_cache,
                   transitions_per_cycle = options.l0_transitions_per_cycle,
                   prefetcher = prefetcher,
                   enable_prefetch = options.enable_prefetch,
                   send_evictions = send_evicts(options),
                   clk_domain = clk_domain,
                   ruby_system = ruby_system)

            cpu_seq = RubySequencer(version = i * num_cpus_per_cluster + j,
                                    clk_domain = clk_domain,
                                    dcache = l0d_cache,
                                    ruby_system = ruby_system)

            l0_cntrl.sequencer = cpu_seq

            l1_cache = L1Cache(size = options.l1d_size,
                               assoc = options.l1d_assoc,
                               start_index_bit = block_size_bits,
                               is_icache = False)

            l1_cntrl = L1Cache_Controller(
                    version = i * num_cpus_per_cluster + j,
                    cache = l1_cache, l2_select_num_bits = l2_bits,
                    cluster_id = i,
                    transitions_per_cycle = options.l1_transitions_per_cycle,
                    ruby_system = ruby_system)

            exec("ruby_system.l0_cntrl%d = l0_cntrl"
                 % ( i * num_cpus_per_cluster + j))
            exec("ruby_system.l1_cntrl%d = l1_cntrl"
                 % ( i * num_cpus_per_cluster + j))

            #
            # Add controllers and sequencers to the appropriate lists
            #
            cpu_sequencers.append(cpu_seq)
            l0_cntrl_nodes.append(l0_cntrl)
            l1_cntrl_nodes.append(l1_cntrl)

            # Connect the L0 and L1 controllers
            l0_cntrl.prefetchQueue = MessageBuffer()
            l0_cntrl.mandatoryQueue = MessageBuffer()
            l0_cntrl.bufferToL1 = MessageBuffer(ordered = True)
            l1_cntrl.bufferFromL0 = l0_cntrl.bufferToL1
            l0_cntrl.bufferFromL1 = MessageBuffer(ordered = True)
            l1_cntrl.bufferToL0 = l0_cntrl.bufferFromL1

            # Connect the L1 controllers and the network
            l1_cntrl.requestToL2 = MessageBuffer()
            l1_cntrl.requestToL2.master = ruby_system.network.slave
            l1_cntrl.responseToL2 = MessageBuffer()
            l1_cntrl.responseToL2.master = ruby_system.network.slave
            l1_cntrl.unblockToL2 = MessageBuffer()
            l1_cntrl.unblockToL2.master = ruby_system.network.slave

            l1_cntrl.requestFromL2 = MessageBuffer()
            l1_cntrl.requestFromL2.slave = ruby_system.network.master
            l1_cntrl.responseFromL2 = MessageBuffer()
            l1_cntrl.responseFromL2.slave = ruby_system.network.master


        for j in range(num_l2caches_per_cluster):
            l2_cache = L2Cache(size = options.l2_size,
                               assoc = options.l2_assoc,
                               start_index_bit = l2_index_start)

            l2_cntrl = L2Cache_Controller(
                        version = i * num_l2caches_per_cluster + j,
                        L2cache = l2_cache, cluster_id = i,
                        transitions_per_cycle =\
                         options.l2_transitions_per_cycle,
                        ruby_system = ruby_system)

            exec("ruby_system.l2_cntrl%d = l2_cntrl"
                 % (i * num_l2caches_per_cluster + j))
            l2_cntrl_nodes.append(l2_cntrl)

            # Connect the L2 controllers and the network
            l2_cntrl.DirRequestFromL2Cache = MessageBuffer()
            l2_cntrl.DirRequestFromL2Cache.master = ruby_system.network.slave
            l2_cntrl.L1RequestFromL2Cache = MessageBuffer()
            l2_cntrl.L1RequestFromL2Cache.master = ruby_system.network.slave
            l2_cntrl.responseFromL2Cache = MessageBuffer()
            l2_cntrl.responseFromL2Cache.master = ruby_system.network.slave

            l2_cntrl.unblockToL2Cache = MessageBuffer()
            l2_cntrl.unblockToL2Cache.slave = ruby_system.network.master
            l2_cntrl.L1RequestToL2Cache = MessageBuffer()
            l2_cntrl.L1RequestToL2Cache.slave = ruby_system.network.master
            l2_cntrl.responseToL2Cache = MessageBuffer()
            l2_cntrl.responseToL2Cache.slave = ruby_system.network.master

    # Run each of the ruby memory controllers at a ratio of the frequency of
    # the ruby system
    # clk_divider value is a fix to pass regression.
    ruby_system.memctrl_clk_domain = DerivedClockDomain(
            clk_domain = ruby_system.clk_domain, clk_divider = 3)

    mem_dir_cntrl_nodes, rom_dir_cntrl_node = create_directories(
        options, bootmem, ruby_system, system)
    dir_cntrl_nodes = mem_dir_cntrl_nodes[:]
    if rom_dir_cntrl_node is not None:
        dir_cntrl_nodes.append(rom_dir_cntrl_node)
    for dir_cntrl in dir_cntrl_nodes:
        # Connect the directory controllers and the network
        dir_cntrl.requestToDir = MessageBuffer()
        dir_cntrl.requestToDir.slave = ruby_system.network.master
        dir_cntrl.responseToDir = MessageBuffer()
        dir_cntrl.responseToDir.slave = ruby_system.network.master
        dir_cntrl.responseFromDir = MessageBuffer()
        dir_cntrl.responseFromDir.master = ruby_system.network.slave
        dir_cntrl.requestToMemory = MessageBuffer()
        dir_cntrl.responseFromMemory = MessageBuffer()

    for i, dma_port in enumerate(dma_ports):
        #
        # Create the Ruby objects associated with the dma controller
        #
        dma_seq = DMASequencer(version = i, ruby_system = ruby_system)

        dma_cntrl = DMA_Controller(version = i,
                                   dma_sequencer = dma_seq,
                                   transitions_per_cycle = options.ports,
                                   ruby_system = ruby_system)

        exec("ruby_system.dma_cntrl%d = dma_cntrl" % i)
        exec("ruby_system.dma_cntrl%d.dma_sequencer.slave = dma_port" % i)
        dma_cntrl_nodes.append(dma_cntrl)

        # Connect the dma controller to the network
        dma_cntrl.mandatoryQueue = MessageBuffer()
        dma_cntrl.responseFromDir = MessageBuffer(ordered = True)
        dma_cntrl.responseFromDir.slave = ruby_system.network.master
        dma_cntrl.requestToDir = MessageBuffer()
        dma_cntrl.requestToDir.master = ruby_system.network.slave

    all_cntrls = l0_cntrl_nodes + \
                 l1_cntrl_nodes + \
                 l2_cntrl_nodes + \
                 dir_cntrl_nodes + \
                 dma_cntrl_nodes

    # Create the io controller and the sequencer
    if full_system:
        io_seq = DMASequencer(version=len(dma_ports), ruby_system=ruby_system)
        ruby_system._io_port = io_seq
        io_controller = DMA_Controller(version = len(dma_ports),
                                       dma_sequencer = io_seq,
                                       ruby_system = ruby_system)
        ruby_system.io_controller = io_controller

        # Connect the dma controller to the network
        io_controller.mandatoryQueue = MessageBuffer()
        io_controller.responseFromDir = MessageBuffer(ordered = True)
        io_controller.responseFromDir.slave = ruby_system.network.master
        io_controller.requestToDir = MessageBuffer()
        io_controller.requestToDir.master = ruby_system.network.slave

        all_cntrls = all_cntrls + [io_controller]
    # Register configuration with filesystem
    else:
        for i in range(options.num_clusters):
            for j in range(num_cpus_per_cluster):
                FileSystemConfig.register_cpu(physical_package_id = 0,
                                              core_siblings = range(options.num_cpus),
                                              core_id = i*num_cpus_per_cluster+j,
                                              thread_siblings = [])

                FileSystemConfig.register_cache(level = 0,
                                                idu_type = 'Instruction',
                                                size = options.l0i_size,
                                                line_size =\
                                                 options.cacheline_size,
                                                assoc = 1,
                                                cpus = [i*num_cpus_per_cluster+j])
                FileSystemConfig.register_cache(level = 0,
                                                idu_type = 'Data',
                                                size = options.l0d_size,
                                                line_size =\
                                                 options.cacheline_size,
                                                assoc = 1,
                                                cpus = [i*num_cpus_per_cluster+j])

                FileSystemConfig.register_cache(level = 1,
                                                idu_type = 'Unified',
                                                size = options.l1d_size,
                                                line_size = options.cacheline_size,
                                                assoc = options.l1d_assoc,
                                                cpus = [i*num_cpus_per_cluster+j])

            FileSystemConfig.register_cache(level = 2,
                                            idu_type = 'Unified',
                                            size = str(MemorySize(options.l2_size) * \
                                                   num_l2caches_per_cluster)+'B',
                                            line_size = options.cacheline_size,
                                            assoc = options.l2_assoc,
                                            cpus = [n for n in range(i*num_cpus_per_cluster, \
                                                                     (i+1)*num_cpus_per_cluster)])

    ruby_system.network.number_of_virtual_networks = 3
    topology = create_topology(all_cntrls, options)
    return (cpu_sequencers, mem_dir_cntrl_nodes, topology)