--- /dev/null
+# -*- coding: utf-8 -*-
+# Copyright (c) 2015 Jason Power
+# 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
+# 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
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Authors: Jason Power
+
+""" This file creates a set of Ruby caches, the Ruby network, and a simple
+point-to-point topology.
+See Part 3 in the Learning gem5 book: learning.gem5.org/book/part3
+You can change simple_ruby to import from this file instead of from msi_caches
+to use the MI_example protocol instead of MSI.
+
+IMPORTANT: If you modify this file, it's likely that the Learning gem5 book
+ also needs to be updated. For now, email Jason <jason@lowepower.com>
+
+"""
+
+import math
+
+from m5.defines import buildEnv
+from m5.util import fatal, panic
+
+from m5.objects import *
+
+class MyCacheSystem(RubySystem):
+
+ def __init__(self):
+ if buildEnv['PROTOCOL'] != 'MI_example':
+ fatal("This system assumes MI_example!")
+
+ super(MyCacheSystem, self).__init__()
+
+ def setup(self, system, cpus, mem_ctrls):
+ """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)
+
+ # MI 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.
+ # Create one controller for each L1 cache (and the cache mem obj.)
+ # Create a single directory controller (Really the memory cntrl)
+ self.controllers = \
+ [L1Cache(system, self, cpu) for cpu in cpus] + \
+ [DirController(self, system.mem_ranges, mem_ctrls)]
+
+ # Create one sequencer per CPU. In many systems this is more
+ # complicated since you have to create sequencers for DMA controllers
+ # and other controllers, too.
+ self.sequencers = [RubySequencer(version = i,
+ # I/D cache is combined and grab from ctrl
+ icache = self.controllers[i].cacheMemory,
+ dcache = self.controllers[i].cacheMemory,
+ clk_domain = self.controllers[i].clk_domain,
+ ) for i in range(len(cpus))]
+
+ for i,c in enumerate(self.controllers[0:len(cpus)]):
+ c.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.slave
+
+ # Connect the cpu's cache, interrupt, and TLB ports to Ruby
+ for i,cpu in enumerate(cpus):
+ cpu.icache_port = self.sequencers[i].slave
+ cpu.dcache_port = self.sequencers[i].slave
+ isa = buildEnv['TARGET_ISA']
+ if isa == 'x86':
+ cpu.interrupts[0].pio = self.sequencers[i].master
+ cpu.interrupts[0].int_master = self.sequencers[i].slave
+ cpu.interrupts[0].int_slave = self.sequencers[i].master
+ if isa == 'x86' or isa == 'arm':
+ cpu.itb.walker.port = self.sequencers[i].slave
+ cpu.dtb.walker.port = self.sequencers[i].slave
+
+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):
+ """CPUs are needed to grab the clock domain and system is needed for
+ the cache block size.
+ """
+ super(L1Cache, self).__init__()
+
+ self.version = self.versionCount()
+ # This is the cache memory object that stores the cache data and tags
+ self.cacheMemory = RubyCache(size = '16kB',
+ assoc = 8,
+ start_index_bit = self.getBlockSizeBits(system))
+ self.clk_domain = cpu.clk_domain
+ self.send_evictions = self.sendEvicts(cpu)
+ 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.requestFromCache = MessageBuffer(ordered = True)
+ self.requestFromCache.master = ruby_system.network.slave
+ self.responseFromCache = MessageBuffer(ordered = True)
+ self.responseFromCache.master = ruby_system.network.slave
+ self.forwardToCache = MessageBuffer(ordered = True)
+ self.forwardToCache.slave = ruby_system.network.master
+ self.responseToCache = MessageBuffer(ordered = True)
+ self.responseToCache.slave = ruby_system.network.master
+
+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 = mem_ctrls[0].port
+ self.connectQueues(ruby_system)
+
+ def connectQueues(self, ruby_system):
+ self.requestToDir = MessageBuffer(ordered = True)
+ self.requestToDir.slave = ruby_system.network.master
+ self.dmaRequestToDir = MessageBuffer(ordered = True)
+ self.dmaRequestToDir.slave = ruby_system.network.master
+
+ self.responseFromDir = MessageBuffer()
+ self.responseFromDir.master = ruby_system.network.slave
+ self.dmaResponseFromDir = MessageBuffer(ordered = True)
+ self.dmaResponseFromDir.master = ruby_system.network.slave
+ self.forwardFromDir = MessageBuffer()
+ self.forwardFromDir.master = ruby_system.network.slave
+ self.responseFromMemory = MessageBuffer()
+
+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))
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