#
#  Copyright (c) 2010-2015 Advanced Micro Devices, Inc.
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#  For use for simulation and test purposes only
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#  this list of conditions and the following disclaimer in the documentation
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#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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#  POSSIBILITY OF SUCH DAMAGE.
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#  Author: Lisa Hsu
#

import math
import m5
from m5.objects import *
from m5.defines import buildEnv
from Ruby import create_topology
from Ruby import send_evicts

from topologies.Cluster import Cluster
from topologies.Crossbar import Crossbar

class CntrlBase:
    _seqs = 0
    @classmethod
    def seqCount(cls):
        # Use SeqCount not class since we need global count
        CntrlBase._seqs += 1
        return CntrlBase._seqs - 1

    _cntrls = 0
    @classmethod
    def cntrlCount(cls):
        # Use CntlCount not class since we need global count
        CntrlBase._cntrls += 1
        return CntrlBase._cntrls - 1

    _version = 0
    @classmethod
    def versionCount(cls):
        cls._version += 1 # Use count for this particular type
        return cls._version - 1

class L1DCache(RubyCache):
    resourceStalls = False
    def create(self, options):
        self.size = MemorySize(options.l1d_size)
        self.assoc = options.l1d_assoc
        self.replacement_policy = PseudoLRUReplacementPolicy()

class L1ICache(RubyCache):
    resourceStalls = False
    def create(self, options):
        self.size = MemorySize(options.l1i_size)
        self.assoc = options.l1i_assoc
        self.replacement_policy = PseudoLRUReplacementPolicy()

class L2Cache(RubyCache):
    resourceStalls = False
    def create(self, options):
        self.size = MemorySize(options.l2_size)
        self.assoc = options.l2_assoc
        self.replacement_policy = PseudoLRUReplacementPolicy()

class CPCntrl(CorePair_Controller, CntrlBase):

    def create(self, options, ruby_system, system):
        self.version = self.versionCount()

        self.L1Icache = L1ICache()
        self.L1Icache.create(options)
        self.L1D0cache = L1DCache()
        self.L1D0cache.create(options)
        self.L1D1cache = L1DCache()
        self.L1D1cache.create(options)
        self.L2cache = L2Cache()
        self.L2cache.create(options)

        self.sequencer = RubySequencer()
        self.sequencer.icache_hit_latency = 2
        self.sequencer.dcache_hit_latency = 2
        self.sequencer.version = self.seqCount()
        self.sequencer.icache = self.L1Icache
        self.sequencer.dcache = self.L1D0cache
        self.sequencer.ruby_system = ruby_system
        self.sequencer.coreid = 0
        self.sequencer.is_cpu_sequencer = True

        self.sequencer1 = RubySequencer()
        self.sequencer1.version = self.seqCount()
        self.sequencer1.icache = self.L1Icache
        self.sequencer1.dcache = self.L1D1cache
        self.sequencer1.icache_hit_latency = 2
        self.sequencer1.dcache_hit_latency = 2
        self.sequencer1.ruby_system = ruby_system
        self.sequencer1.coreid = 1
        self.sequencer1.is_cpu_sequencer = True

        self.issue_latency = options.cpu_to_dir_latency
        self.send_evictions = send_evicts(options)

        self.ruby_system = ruby_system

        if options.recycle_latency:
            self.recycle_latency = options.recycle_latency

class L3Cache(RubyCache):
    assoc = 8
    dataArrayBanks = 256
    tagArrayBanks = 256

    def create(self, options, ruby_system, system):
        self.size = MemorySize(options.l3_size)
        self.size.value /= options.num_dirs
        self.dataArrayBanks /= options.num_dirs
        self.tagArrayBanks /= options.num_dirs
        self.dataArrayBanks /= options.num_dirs
        self.tagArrayBanks /= options.num_dirs
        self.dataAccessLatency = options.l3_data_latency
        self.tagAccessLatency = options.l3_tag_latency
        self.resourceStalls = options.no_resource_stalls
        self.replacement_policy = PseudoLRUReplacementPolicy()

class L3Cntrl(L3Cache_Controller, CntrlBase):
    def create(self, options, ruby_system, system):
        self.version = self.versionCount()
        self.L3cache = L3Cache()
        self.L3cache.create(options, ruby_system, system)

        self.l3_response_latency = max(self.L3cache.dataAccessLatency,
                                       self.L3cache.tagAccessLatency)
        self.ruby_system = ruby_system

        if options.recycle_latency:
            self.recycle_latency = options.recycle_latency

    def connectWireBuffers(self, req_to_dir, resp_to_dir, l3_unblock_to_dir,
                           req_to_l3, probe_to_l3, resp_to_l3):
        self.reqToDir = req_to_dir
        self.respToDir = resp_to_dir
        self.l3UnblockToDir = l3_unblock_to_dir
        self.reqToL3 = req_to_l3
        self.probeToL3 = probe_to_l3
        self.respToL3 = resp_to_l3

class DirMem(RubyDirectoryMemory, CntrlBase):
    def create(self, options, ruby_system, system):
        self.version = self.versionCount()

        phys_mem_size = AddrRange(options.mem_size).size()
        mem_module_size = phys_mem_size / options.num_dirs
        dir_size = MemorySize('0B')
        dir_size.value = mem_module_size
        self.size = dir_size

class DirCntrl(Directory_Controller, CntrlBase):
    def create(self, options, ruby_system, system):
        self.version = self.versionCount()

        self.response_latency = 30

        self.directory = DirMem()
        self.directory.create(options, ruby_system, system)

        self.L3CacheMemory = L3Cache()
        self.L3CacheMemory.create(options, ruby_system, system)

        self.l3_hit_latency = max(self.L3CacheMemory.dataAccessLatency,
                                  self.L3CacheMemory.tagAccessLatency)

        self.number_of_TBEs = options.num_tbes

        self.ruby_system = ruby_system

        if options.recycle_latency:
            self.recycle_latency = options.recycle_latency

        self.CPUonly = True

    def connectWireBuffers(self, req_to_dir, resp_to_dir, l3_unblock_to_dir,
                           req_to_l3, probe_to_l3, resp_to_l3):
        self.reqToDir = req_to_dir
        self.respToDir = resp_to_dir
        self.l3UnblockToDir = l3_unblock_to_dir
        self.reqToL3 = req_to_l3
        self.probeToL3 = probe_to_l3
        self.respToL3 = resp_to_l3

def define_options(parser):
    parser.add_option("--num-subcaches", type="int", default=4)
    parser.add_option("--l3-data-latency", type="int", default=20)
    parser.add_option("--l3-tag-latency", type="int", default=15)
    parser.add_option("--cpu-to-dir-latency", type="int", default=15)
    parser.add_option("--no-resource-stalls", action="store_false",
                      default=True)
    parser.add_option("--num-tbes", type="int", default=256)
    parser.add_option("--l2-latency", type="int", default=50) # load to use

def create_system(options, full_system, system, dma_devices, ruby_system):
    if buildEnv['PROTOCOL'] != 'MOESI_AMD_Base':
        panic("This script requires the MOESI_AMD_Base protocol.")

    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.
    #
    l1_cntrl_nodes = []
    l3_cntrl_nodes = []
    dir_cntrl_nodes = []

    control_count = 0

    #
    # Must create the individual controllers before the network to ensure
    # the controller constructors are called before the network constructor
    #

    # This is the base crossbar that connects the L3s, Dirs, and cpu
    # Cluster
    mainCluster = Cluster(extBW = 512, intBW = 512) # 1 TB/s
    for i in xrange(options.num_dirs):

        dir_cntrl = DirCntrl(TCC_select_num_bits = 0)
        dir_cntrl.create(options, ruby_system, system)

        # Connect the Directory controller to the ruby network
        dir_cntrl.requestFromCores = MessageBuffer(ordered = True)
        dir_cntrl.requestFromCores.slave = ruby_system.network.master

        dir_cntrl.responseFromCores = MessageBuffer()
        dir_cntrl.responseFromCores.slave = ruby_system.network.master

        dir_cntrl.unblockFromCores = MessageBuffer()
        dir_cntrl.unblockFromCores.slave = ruby_system.network.master

        dir_cntrl.probeToCore = MessageBuffer()
        dir_cntrl.probeToCore.master = ruby_system.network.slave

        dir_cntrl.responseToCore = MessageBuffer()
        dir_cntrl.responseToCore.master = ruby_system.network.slave

        dir_cntrl.triggerQueue = MessageBuffer(ordered = True)
        dir_cntrl.L3triggerQueue = MessageBuffer(ordered = True)
        dir_cntrl.responseFromMemory = MessageBuffer()

        exec("system.dir_cntrl%d = dir_cntrl" % i)
        dir_cntrl_nodes.append(dir_cntrl)

        mainCluster.add(dir_cntrl)

    # Technically this config can support an odd number of cpus, but the top
    # level config files, such as the ruby_random_tester, will get confused if
    # the number of cpus does not equal the number of sequencers.  Thus make
    # sure that an even number of cpus is specified.
    assert((options.num_cpus % 2) == 0)

    # For an odd number of CPUs, still create the right number of controllers
    cpuCluster = Cluster(extBW = 512, intBW = 512)  # 1 TB/s
    for i in xrange((options.num_cpus + 1) / 2):

        cp_cntrl = CPCntrl()
        cp_cntrl.create(options, ruby_system, system)

        exec("system.cp_cntrl%d = cp_cntrl" % i)
        #
        # Add controllers and sequencers to the appropriate lists
        #
        cpu_sequencers.extend([cp_cntrl.sequencer, cp_cntrl.sequencer1])

        # Connect the CP controllers and the network
        cp_cntrl.requestFromCore = MessageBuffer()
        cp_cntrl.requestFromCore.master = ruby_system.network.slave

        cp_cntrl.responseFromCore = MessageBuffer()
        cp_cntrl.responseFromCore.master = ruby_system.network.slave

        cp_cntrl.unblockFromCore = MessageBuffer()
        cp_cntrl.unblockFromCore.master = ruby_system.network.slave

        cp_cntrl.probeToCore = MessageBuffer()
        cp_cntrl.probeToCore.slave = ruby_system.network.master

        cp_cntrl.responseToCore = MessageBuffer()
        cp_cntrl.responseToCore.slave = ruby_system.network.master

        cp_cntrl.mandatoryQueue = MessageBuffer()
        cp_cntrl.triggerQueue = MessageBuffer(ordered = True)

        cpuCluster.add(cp_cntrl)

    # Assuming no DMA devices
    assert(len(dma_devices) == 0)

    # Add cpu/gpu clusters to main cluster
    mainCluster.add(cpuCluster)

    ruby_system.network.number_of_virtual_networks = 10

    return (cpu_sequencers, dir_cntrl_nodes, mainCluster)