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# Copyright (c) 2021 The Regents of the University of California.
# All Rights Reserved
#
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""" This file creates a set of Ruby caches for the MESI TWO Level protocol
This protocol models two level cache hierarchy. The L1 cache is split into
instruction and data cache.
This system support the memory size of up to 3GB.
"""
from __future__ import print_function
from __future__ import absolute_import
import math
from m5.defines import buildEnv
from m5.util import fatal, panic
from m5.objects import *
class MESITwoLevelCache(RubySystem):
def __init__(self):
if buildEnv['PROTOCOL'] != 'MESI_Two_Level':
fatal("This system assumes MESI_Two_Level!")
super(MESITwoLevelCache, self).__init__()
self._numL2Caches = 8
def setup(self, system, cpus, mem_ctrls, dma_ports, iobus):
"""Set up the Ruby cache subsystem. Note: This can't be done in the
constructor because many of these items require a pointer to the
ruby system (self). This causes infinite recursion in initialize()
if we do this in the __init__.
"""
# Ruby's global network.
self.network = MyNetwork(self)
# MESI_Two_Level example uses 5 virtual networks
self.number_of_virtual_networks = 5
self.network.number_of_virtual_networks = 5
# There is a single global list of all of the controllers to make it
# easier to connect everything to the global network. This can be
# customized depending on the topology/network requirements.
# L1 caches are private to a core, hence there are one L1 cache per CPU
# core. The number of L2 caches are dependent to the architecture.
self.controllers = \
[L1Cache(system, self, cpu, self._numL2Caches) for cpu in cpus] + \
[L2Cache(system, self, self._numL2Caches) for num in \
range(self._numL2Caches)] + [DirController(self, \
system.mem_ranges, mem_ctrls)] + [DMAController(self) for i \
in range(len(dma_ports))]
# Create one sequencer per CPU and dma controller.
# Sequencers for other controllers can be here here.
self.sequencers = [RubySequencer(version = i,
# Grab dcache from ctrl
dcache = self.controllers[i].L1Dcache,
clk_domain = self.controllers[i].clk_domain,
pio_request_port = iobus.cpu_side_ports,
mem_request_port = iobus.cpu_side_ports,
pio_response_port = iobus.mem_side_ports
) for i in range(len(cpus))] + \
[DMASequencer(version = i,
in_ports = port)
for i,port in enumerate(dma_ports)
]
for i,c in enumerate(self.controllers[:len(cpus)]):
c.sequencer = self.sequencers[i]
#Connecting the DMA sequencer to DMA controller
for i,d in enumerate(self.controllers[-len(dma_ports):]):
i += len(cpus)
d.dma_sequencer = self.sequencers[i]
self.num_of_sequencers = len(self.sequencers)
# Create the network and connect the controllers.
# NOTE: This is quite different if using Garnet!
self.network.connectControllers(self.controllers)
self.network.setup_buffers()
# Set up a proxy port for the system_port. Used for load binaries and
# other functional-only things.
self.sys_port_proxy = RubyPortProxy()
system.system_port = self.sys_port_proxy.in_ports
self.sys_port_proxy.pio_request_port = iobus.cpu_side_ports
# Connect the cpu's cache, interrupt, and TLB ports to Ruby
for i,cpu in enumerate(cpus):
cpu.icache_port = self.sequencers[i].in_ports
cpu.dcache_port = self.sequencers[i].in_ports
isa = buildEnv['TARGET_ISA']
if isa == 'x86':
cpu.interrupts[0].pio = self.sequencers[i].interrupt_out_port
cpu.interrupts[0].int_requestor = self.sequencers[i].in_ports
cpu.interrupts[0].int_responder = \
self.sequencers[i].interrupt_out_port
if isa == 'x86' or isa == 'arm':
cpu.mmu.connectWalkerPorts(
self.sequencers[i].in_ports, self.sequencers[i].in_ports)
class L1Cache(L1Cache_Controller):
_version = 0
@classmethod
def versionCount(cls):
cls._version += 1 # Use count for this particular type
return cls._version - 1
def __init__(self, system, ruby_system, cpu, num_l2Caches):
"""Creating L1 cache controller. Consist of both instruction
and data cache. The size of data cache is 512KB and
8-way set associative. The instruction cache is 32KB,
2-way set associative.
"""
super(L1Cache, self).__init__()
self.version = self.versionCount()
block_size_bits = int(math.log(system.cache_line_size, 2))
l1i_size = '32kB'
l1i_assoc = '2'
l1d_size = '512kB'
l1d_assoc = '8'
# This is the cache memory object that stores the cache data and tags
self.L1Icache = RubyCache(size = l1i_size,
assoc = l1i_assoc,
start_index_bit = block_size_bits ,
is_icache = True)
self.L1Dcache = RubyCache(size = l1d_size,
assoc = l1d_assoc,
start_index_bit = block_size_bits,
is_icache = False)
self.l2_select_num_bits = int(math.log(num_l2Caches , 2))
self.clk_domain = cpu.clk_domain
self.prefetcher = RubyPrefetcher()
self.send_evictions = self.sendEvicts(cpu)
self.transitions_per_cycle = 4
self.enable_prefetch = False
self.ruby_system = ruby_system
self.connectQueues(ruby_system)
def getBlockSizeBits(self, system):
bits = int(math.log(system.cache_line_size, 2))
if 2**bits != system.cache_line_size.value:
panic("Cache line size not a power of 2!")
return bits
def sendEvicts(self, cpu):
"""True if the CPU model or ISA requires sending evictions from caches
to the CPU. Two scenarios warrant forwarding evictions to the CPU:
1. The O3 model must keep the LSQ coherent with the caches
2. The x86 mwait instruction is built on top of coherence
3. The local exclusive monitor in ARM systems
"""
if type(cpu) is DerivO3CPU or \
buildEnv['TARGET_ISA'] in ('x86', 'arm'):
return True
return False
def connectQueues(self, ruby_system):
"""Connect all of the queues for this controller.
"""
self.mandatoryQueue = MessageBuffer()
self.requestFromL1Cache = MessageBuffer()
self.requestFromL1Cache.out_port = ruby_system.network.in_port
self.responseFromL1Cache = MessageBuffer()
self.responseFromL1Cache.out_port = ruby_system.network.in_port
self.unblockFromL1Cache = MessageBuffer()
self.unblockFromL1Cache.out_port = ruby_system.network.in_port
self.optionalQueue = MessageBuffer()
self.requestToL1Cache = MessageBuffer()
self.requestToL1Cache.in_port = ruby_system.network.out_port
self.responseToL1Cache = MessageBuffer()
self.responseToL1Cache.in_port = ruby_system.network.out_port
class L2Cache(L2Cache_Controller):
_version = 0
@classmethod
def versionCount(cls):
cls._version += 1 # Use count for this particular type
return cls._version - 1
def __init__(self, system, ruby_system, num_l2Caches):
super(L2Cache, self).__init__()
self.version = self.versionCount()
# This is the cache memory object that stores the cache data and tags
self.L2cache = RubyCache(size = '1 MB',
assoc = 16,
start_index_bit = self.getBlockSizeBits(system,
num_l2Caches))
self.transitions_per_cycle = '4'
self.ruby_system = ruby_system
self.connectQueues(ruby_system)
def getBlockSizeBits(self, system, num_l2caches):
l2_bits = int(math.log(num_l2caches, 2))
bits = int(math.log(system.cache_line_size, 2)) + l2_bits
return bits
def connectQueues(self, ruby_system):
"""Connect all of the queues for this controller.
"""
self.DirRequestFromL2Cache = MessageBuffer()
self.DirRequestFromL2Cache.out_port = ruby_system.network.in_port
self.L1RequestFromL2Cache = MessageBuffer()
self.L1RequestFromL2Cache.out_port = ruby_system.network.in_port
self.responseFromL2Cache = MessageBuffer()
self.responseFromL2Cache.out_port = ruby_system.network.in_port
self.unblockToL2Cache = MessageBuffer()
self.unblockToL2Cache.in_port = ruby_system.network.out_port
self.L1RequestToL2Cache = MessageBuffer()
self.L1RequestToL2Cache.in_port = ruby_system.network.out_port
self.responseToL2Cache = MessageBuffer()
self.responseToL2Cache.in_port = ruby_system.network.out_port
class DirController(Directory_Controller):
_version = 0
@classmethod
def versionCount(cls):
cls._version += 1 # Use count for this particular type
return cls._version - 1
def __init__(self, ruby_system, ranges, mem_ctrls):
"""ranges are the memory ranges assigned to this controller.
"""
if len(mem_ctrls) > 1:
panic("This cache system can only be connected to one mem ctrl")
super(DirController, self).__init__()
self.version = self.versionCount()
self.addr_ranges = ranges
self.ruby_system = ruby_system
self.directory = RubyDirectoryMemory()
# Connect this directory to the memory side.
self.memory_out_port = mem_ctrls[0].port
self.connectQueues(ruby_system)
def connectQueues(self, ruby_system):
self.requestToDir = MessageBuffer()
self.requestToDir.in_port = ruby_system.network.out_port
self.responseToDir = MessageBuffer()
self.responseToDir.in_port = ruby_system.network.out_port
self.responseFromDir = MessageBuffer()
self.responseFromDir.out_port = ruby_system.network.in_port
self.requestToMemory = MessageBuffer()
self.responseFromMemory = MessageBuffer()
class DMAController(DMA_Controller):
_version = 0
@classmethod
def versionCount(cls):
cls._version += 1 # Use count for this particular type
return cls._version - 1
def __init__(self, ruby_system):
super(DMAController, self).__init__()
self.version = self.versionCount()
self.ruby_system = ruby_system
self.connectQueues(ruby_system)
def connectQueues(self, ruby_system):
self.mandatoryQueue = MessageBuffer()
self.responseFromDir = MessageBuffer(ordered = True)
self.responseFromDir.in_port = ruby_system.network.out_port
self.requestToDir = MessageBuffer()
self.requestToDir.out_port = ruby_system.network.in_port
class MyNetwork(SimpleNetwork):
"""A simple point-to-point network. This doesn't not use garnet.
"""
def __init__(self, ruby_system):
super(MyNetwork, self).__init__()
self.netifs = []
self.ruby_system = ruby_system
def connectControllers(self, controllers):
"""Connect all of the controllers to routers and connec the routers
together in a point-to-point network.
"""
# Create one router/switch per controller in the system
self.routers = [Switch(router_id = i) for i in range(len(controllers))]
# Make a link from each controller to the router. The link goes
# externally to the network.
self.ext_links = [SimpleExtLink(link_id=i, ext_node=c,
int_node=self.routers[i])
for i, c in enumerate(controllers)]
# Make an "internal" link (internal to the network) between every pair
# of routers.
link_count = 0
self.int_links = []
for ri in self.routers:
for rj in self.routers:
if ri == rj: continue # Don't connect a router to itself!
link_count += 1
self.int_links.append(SimpleIntLink(link_id = link_count,
src_node = ri,
dst_node = rj))