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# Authors: Andreas Sandberg
# Gabor Dozsa
# System components used by the bigLITTLE.py configuration script
import m5
from m5.objects import *
m5.util.addToPath('../../')
from common.Caches import *
from common import CpuConfig
have_kvm = "ArmV8KvmCPU" in CpuConfig.cpu_names()
class L1I(L1_ICache):
tag_latency = 1
data_latency = 1
response_latency = 1
mshrs = 4
tgts_per_mshr = 8
size = '48kB'
assoc = 3
class L1D(L1_DCache):
tag_latency = 2
data_latency = 2
response_latency = 1
mshrs = 16
tgts_per_mshr = 16
size = '32kB'
assoc = 2
write_buffers = 16
class WalkCache(PageTableWalkerCache):
tag_latency = 4
data_latency = 4
response_latency = 4
mshrs = 6
tgts_per_mshr = 8
size = '1kB'
assoc = 8
write_buffers = 16
class L2(L2Cache):
tag_latency = 12
data_latency = 12
response_latency = 5
mshrs = 32
tgts_per_mshr = 8
size = '1MB'
assoc = 16
write_buffers = 8
clusivity='mostly_excl'
class L3(Cache):
size = '16MB'
assoc = 16
tag_latency = 20
data_latency = 20
response_latency = 20
mshrs = 20
tgts_per_mshr = 12
clusivity='mostly_excl'
class MemBus(SystemXBar):
badaddr_responder = BadAddr(warn_access="warn")
default = Self.badaddr_responder.pio
class CpuCluster(SubSystem):
def __init__(self, system, num_cpus, cpu_clock, cpu_voltage,
cpu_type, l1i_type, l1d_type, wcache_type, l2_type):
super(CpuCluster, self).__init__()
self._cpu_type = cpu_type
self._l1i_type = l1i_type
self._l1d_type = l1d_type
self._wcache_type = wcache_type
self._l2_type = l2_type
assert num_cpus > 0
self.voltage_domain = VoltageDomain(voltage=cpu_voltage)
self.clk_domain = SrcClockDomain(clock=cpu_clock,
voltage_domain=self.voltage_domain)
self.cpus = [ self._cpu_type(cpu_id=system.numCpus() + idx,
clk_domain=self.clk_domain)
for idx in range(num_cpus) ]
for cpu in self.cpus:
cpu.createThreads()
cpu.createInterruptController()
cpu.socket_id = system.numCpuClusters()
system.addCpuCluster(self, num_cpus)
def requireCaches(self):
return self._cpu_type.require_caches()
def memoryMode(self):
return self._cpu_type.memory_mode()
def addL1(self):
for cpu in self.cpus:
l1i = None if self._l1i_type is None else self._l1i_type()
l1d = None if self._l1d_type is None else self._l1d_type()
iwc = None if self._wcache_type is None else self._wcache_type()
dwc = None if self._wcache_type is None else self._wcache_type()
cpu.addPrivateSplitL1Caches(l1i, l1d, iwc, dwc)
def addL2(self, clk_domain):
if self._l2_type is None:
return
self.toL2Bus = L2XBar(width=64, clk_domain=clk_domain)
self.l2 = self._l2_type()
for cpu in self.cpus:
cpu.connectAllPorts(self.toL2Bus)
self.toL2Bus.master = self.l2.cpu_side
def connectMemSide(self, bus):
bus.slave
try:
self.l2.mem_side = bus.slave
except AttributeError:
for cpu in self.cpus:
cpu.connectAllPorts(bus)
class AtomicCluster(CpuCluster):
def __init__(self, system, num_cpus, cpu_clock, cpu_voltage="1.0V"):
cpu_config = [ CpuConfig.get("AtomicSimpleCPU"), None, None, None, None ]
super(AtomicCluster, self).__init__(system, num_cpus, cpu_clock,
cpu_voltage, *cpu_config)
def addL1(self):
pass
class KvmCluster(CpuCluster):
def __init__(self, system, num_cpus, cpu_clock, cpu_voltage="1.0V"):
cpu_config = [ CpuConfig.get("ArmV8KvmCPU"), None, None, None, None ]
super(KvmCluster, self).__init__(system, num_cpus, cpu_clock,
cpu_voltage, *cpu_config)
def addL1(self):
pass
class SimpleSystem(LinuxArmSystem):
cache_line_size = 64
def __init__(self, caches, mem_size, **kwargs):
super(SimpleSystem, self).__init__(**kwargs)
self.voltage_domain = VoltageDomain(voltage="1.0V")
self.clk_domain = SrcClockDomain(clock="1GHz",
voltage_domain=Parent.voltage_domain)
self.realview = VExpress_GEM5_V1()
self.gic_cpu_addr = self.realview.gic.cpu_addr
self.flags_addr = self.realview.realview_io.pio_addr + 0x30
self.membus = MemBus()
self.intrctrl = IntrControl()
self.terminal = Terminal()
self.vncserver = VncServer()
self.iobus = IOXBar()
# CPUs->PIO
self.iobridge = Bridge(delay='50ns')
# Device DMA -> MEM
mem_range = self.realview._mem_regions[0]
mem_range_size = long(mem_range[1]) - long(mem_range[0])
assert mem_range_size >= long(Addr(mem_size))
self.mem_ranges = [ AddrRange(start=mem_range[0], size=mem_size) ]
self._caches = caches
if self._caches:
self.iocache = IOCache(addr_ranges=[self.mem_ranges[0]])
else:
self.dmabridge = Bridge(delay='50ns',
ranges=[self.mem_ranges[0]])
self._pci_devices = 0
self._clusters = []
self._num_cpus = 0
def attach_pci(self, dev):
dev.pci_bus, dev.pci_dev, dev.pci_func = (0, self._pci_devices + 1, 0)
self._pci_devices += 1
self.realview.attachPciDevice(dev, self.iobus)
def connect(self):
self.iobridge.master = self.iobus.slave
self.iobridge.slave = self.membus.master
if self._caches:
self.iocache.mem_side = self.membus.slave
self.iocache.cpu_side = self.iobus.master
else:
self.dmabridge.master = self.membus.slave
self.dmabridge.slave = self.iobus.master
self.gic_cpu_addr = self.realview.gic.cpu_addr
self.realview.attachOnChipIO(self.membus, self.iobridge)
self.realview.attachIO(self.iobus)
self.system_port = self.membus.slave
def numCpuClusters(self):
return len(self._clusters)
def addCpuCluster(self, cpu_cluster, num_cpus):
assert cpu_cluster not in self._clusters
assert num_cpus > 0
self._clusters.append(cpu_cluster)
self._num_cpus += num_cpus
def numCpus(self):
return self._num_cpus
def addCaches(self, need_caches, last_cache_level):
if not need_caches:
# connect each cluster to the memory hierarchy
for cluster in self._clusters:
cluster.connectMemSide(self.membus)
return
cluster_mem_bus = self.membus
assert last_cache_level >= 1 and last_cache_level <= 3
for cluster in self._clusters:
cluster.addL1()
if last_cache_level > 1:
for cluster in self._clusters:
cluster.addL2(cluster.clk_domain)
if last_cache_level > 2:
max_clock_cluster = max(self._clusters,
key=lambda c: c.clk_domain.clock[0])
self.l3 = L3(clk_domain=max_clock_cluster.clk_domain)
self.toL3Bus = L2XBar(width=64)
self.toL3Bus.master = self.l3.cpu_side
self.l3.mem_side = self.membus.slave
cluster_mem_bus = self.toL3Bus
# connect each cluster to the memory hierarchy
for cluster in self._clusters:
cluster.connectMemSide(cluster_mem_bus)