9a13acaa36
Add support for KVM in the big.LITTLE(tm) example configuration. This replaces the --atomic option with a --cpu-type option that can be used to switch between atomic, kvm, and timing simulation. When running in KVM mode, the simulation script automatically assigns separate event queues (threads) to each of the simulated CPUs. All simulated devices, including CPU child devices (e.g., interrupt controllers and caches), are assigned to event queue 0. Change-Id: Ic9a3f564db91f5a3d3cb754c5a02fdd5c17d5fdf Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Curtis Dunham <curtis.dunham@arm.com> Reviewed-by: Sascha Bischoff <sascha.bischoff@arm.com> Reviewed-by: Gabor Dozsa <gabor.dozsa@arm.com> Reviewed-on: https://gem5-review.googlesource.com/2561 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Weiping Liao <weipingliao@google.com>
310 lines
11 KiB
Python
310 lines
11 KiB
Python
# Copyright (c) 2016-2017 ARM Limited
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# All rights reserved.
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#
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# The license below extends only to copyright in the software and shall
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# not be construed as granting a license to any other intellectual
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# property including but not limited to intellectual property relating
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# to a hardware implementation of the functionality of the software
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# licensed hereunder. You may use the software subject to the license
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# terms below provided that you ensure that this notice is replicated
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# unmodified and in its entirety in all distributions of the software,
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# modified or unmodified, in source code or in binary form.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Gabor Dozsa
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# Andreas Sandberg
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# This is an example configuration script for full system simulation of
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# a generic ARM bigLITTLE system.
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import argparse
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import os
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import sys
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import m5
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import m5.util
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from m5.objects import *
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m5.util.addToPath("../../")
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from common import SysPaths
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from common import CpuConfig
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import devices
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from devices import AtomicCluster, KvmCluster
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default_dtb = 'armv8_gem5_v1_big_little_2_2.dtb'
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default_kernel = 'vmlinux4.3.aarch64'
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default_disk = 'aarch64-ubuntu-trusty-headless.img'
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default_rcs = 'bootscript.rcS'
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default_mem_size= "2GB"
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def _to_ticks(value):
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"""Helper function to convert a latency from string format to Ticks"""
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return m5.ticks.fromSeconds(m5.util.convert.anyToLatency(value))
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def _using_pdes(root):
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"""Determine if the simulator is using multiple parallel event queues"""
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for obj in root.descendants():
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if not m5.proxy.isproxy(obj.eventq_index) and \
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obj.eventq_index != root.eventq_index:
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return True
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return False
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class BigCluster(devices.CpuCluster):
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def __init__(self, system, num_cpus, cpu_clock,
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cpu_voltage="1.0V"):
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cpu_config = [ CpuConfig.get("arm_detailed"), devices.L1I, devices.L1D,
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devices.WalkCache, devices.L2 ]
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super(BigCluster, self).__init__(system, num_cpus, cpu_clock,
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cpu_voltage, *cpu_config)
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class LittleCluster(devices.CpuCluster):
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def __init__(self, system, num_cpus, cpu_clock,
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cpu_voltage="1.0V"):
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cpu_config = [ CpuConfig.get("minor"), devices.L1I, devices.L1D,
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devices.WalkCache, devices.L2 ]
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super(LittleCluster, self).__init__(system, num_cpus, cpu_clock,
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cpu_voltage, *cpu_config)
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def createSystem(caches, kernel, bootscript, disks=[]):
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sys = devices.SimpleSystem(caches, default_mem_size,
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kernel=SysPaths.binary(kernel),
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readfile=bootscript,
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machine_type="DTOnly")
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sys.mem_ctrls = SimpleMemory(range=sys._mem_range)
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sys.mem_ctrls.port = sys.membus.master
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sys.connect()
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# Attach disk images
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if disks:
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def cow_disk(image_file):
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image = CowDiskImage()
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image.child.image_file = SysPaths.disk(image_file)
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return image
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sys.disk_images = [ cow_disk(f) for f in disks ]
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sys.pci_vio_block = [ PciVirtIO(vio=VirtIOBlock(image=img))
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for img in sys.disk_images ]
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for dev in sys.pci_vio_block:
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sys.attach_pci(dev)
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sys.realview.setupBootLoader(sys.membus, sys, SysPaths.binary)
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return sys
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cpu_types = {
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"atomic" : (AtomicCluster, AtomicCluster),
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"timing" : (BigCluster, LittleCluster),
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}
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# Only add the KVM CPU if it has been compiled into gem5
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if devices.have_kvm:
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cpu_types["kvm"] = (KvmCluster, KvmCluster)
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def addOptions(parser):
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parser.add_argument("--restore-from", type=str, default=None,
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help="Restore from checkpoint")
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parser.add_argument("--dtb", type=str, default=default_dtb,
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help="DTB file to load")
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parser.add_argument("--kernel", type=str, default=default_kernel,
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help="Linux kernel")
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parser.add_argument("--disk", action="append", type=str, default=[],
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help="Disks to instantiate")
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parser.add_argument("--bootscript", type=str, default=default_rcs,
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help="Linux bootscript")
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parser.add_argument("--cpu-type", type=str, choices=cpu_types.keys(),
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default="timing",
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help="CPU simulation mode. Default: %(default)s")
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parser.add_argument("--kernel-init", type=str, default="/sbin/init",
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help="Override init")
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parser.add_argument("--big-cpus", type=int, default=1,
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help="Number of big CPUs to instantiate")
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parser.add_argument("--little-cpus", type=int, default=1,
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help="Number of little CPUs to instantiate")
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parser.add_argument("--caches", action="store_true", default=False,
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help="Instantiate caches")
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parser.add_argument("--last-cache-level", type=int, default=2,
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help="Last level of caches (e.g. 3 for L3)")
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parser.add_argument("--big-cpu-clock", type=str, default="2GHz",
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help="Big CPU clock frequency")
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parser.add_argument("--little-cpu-clock", type=str, default="1GHz",
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help="Little CPU clock frequency")
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parser.add_argument("--sim-quantum", type=str, default="1ms",
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help="Simulation quantum for parallel simulation. " \
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"Default: %(default)s")
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return parser
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def build(options):
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m5.ticks.fixGlobalFrequency()
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kernel_cmd = [
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"earlyprintk=pl011,0x1c090000",
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"console=ttyAMA0",
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"lpj=19988480",
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"norandmaps",
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"loglevel=8",
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"mem=%s" % default_mem_size,
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"root=/dev/vda1",
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"rw",
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"init=%s" % options.kernel_init,
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"vmalloc=768MB",
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]
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root = Root(full_system=True)
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disks = [default_disk] if len(options.disk) == 0 else options.disk
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system = createSystem(options.caches,
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options.kernel,
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options.bootscript,
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disks=disks)
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root.system = system
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system.boot_osflags = " ".join(kernel_cmd)
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if options.big_cpus + options.little_cpus == 0:
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m5.util.panic("Empty CPU clusters")
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big_model, little_model = cpu_types[options.cpu_type]
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all_cpus = []
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# big cluster
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if options.big_cpus > 0:
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system.bigCluster = big_model(system, options.big_cpus,
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options.big_cpu_clock)
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system.mem_mode = system.bigCluster.memoryMode()
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all_cpus += system.bigCluster.cpus
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# little cluster
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if options.little_cpus > 0:
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system.littleCluster = little_model(system, options.little_cpus,
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options.little_cpu_clock)
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system.mem_mode = system.littleCluster.memoryMode()
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all_cpus += system.littleCluster.cpus
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# Figure out the memory mode
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if options.big_cpus > 0 and options.little_cpus > 0 and \
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system.littleCluster.memoryMode() != system.littleCluster.memoryMode():
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m5.util.panic("Memory mode missmatch among CPU clusters")
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# create caches
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system.addCaches(options.caches, options.last_cache_level)
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if not options.caches:
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if options.big_cpus > 0 and system.bigCluster.requireCaches():
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m5.util.panic("Big CPU model requires caches")
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if options.little_cpus > 0 and system.littleCluster.requireCaches():
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m5.util.panic("Little CPU model requires caches")
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# Create a KVM VM and do KVM-specific configuration
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if issubclass(big_model, KvmCluster):
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_build_kvm(system, all_cpus)
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# Linux device tree
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system.dtb_filename = SysPaths.binary(options.dtb)
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return root
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def _build_kvm(system, cpus):
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system.kvm_vm = KvmVM()
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# Assign KVM CPUs to their own event queues / threads. This
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# has to be done after creating caches and other child objects
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# since these mustn't inherit the CPU event queue.
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if len(cpus) > 1:
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device_eq = 0
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first_cpu_eq = 1
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for idx, cpu in enumerate(cpus):
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# Child objects usually inherit the parent's event
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# queue. Override that and use the same event queue for
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# all devices.
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for obj in cpu.descendants():
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obj.eventq_index = device_eq
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cpu.eventq_index = first_cpu_eq + idx
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def instantiate(options, checkpoint_dir=None):
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# Setup the simulation quantum if we are running in PDES-mode
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# (e.g., when using KVM)
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root = Root.getInstance()
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if root and _using_pdes(root):
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m5.util.inform("Running in PDES mode with a %s simulation quantum.",
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options.sim_quantum)
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root.sim_quantum = _to_ticks(options.sim_quantum)
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# Get and load from the chkpt or simpoint checkpoint
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if options.restore_from:
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if checkpoint_dir and not os.path.isabs(options.restore_from):
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cpt = os.path.join(checkpoint_dir, options.restore_from)
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else:
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cpt = options.restore_from
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m5.util.inform("Restoring from checkpoint %s", cpt)
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m5.instantiate(cpt)
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else:
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m5.instantiate()
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def run(checkpoint_dir=m5.options.outdir):
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# start simulation (and drop checkpoints when requested)
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while True:
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event = m5.simulate()
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exit_msg = event.getCause()
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if exit_msg == "checkpoint":
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print "Dropping checkpoint at tick %d" % m5.curTick()
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cpt_dir = os.path.join(checkpoint_dir, "cpt.%d" % m5.curTick())
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m5.checkpoint(cpt_dir)
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print "Checkpoint done."
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else:
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print exit_msg, " @ ", m5.curTick()
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break
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sys.exit(event.getCode())
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def main():
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parser = argparse.ArgumentParser(
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description="Generic ARM big.LITTLE configuration")
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addOptions(parser)
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options = parser.parse_args()
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root = build(options)
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instantiate(options)
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run()
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if __name__ == "__m5_main__":
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main()
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