fs_bigLITTLE.py revision 11756 
1# Copyright (c) 2016 ARM Limited
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
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8# licensed hereunder.  You may use the software subject to the license
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15# met: redistributions of source code must retain the above copyright
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24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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35#
36# Authors: Gabor Dozsa
37#          Andreas Sandberg
38
39# This is an example configuration script for full system simulation of
40# a generic ARM bigLITTLE system.
41
42
43import argparse
44import os
45import sys
46import m5
47from m5.objects import *
48
49m5.util.addToPath("../../")
50
51from common import SysPaths
52from common import CpuConfig
53
54import devices
55
56
57default_dtb = 'armv8_gem5_v1_big_little_2_2.dtb'
58default_kernel = 'vmlinux4.3.aarch64'
59default_disk = 'aarch64-ubuntu-trusty-headless.img'
60default_rcs = 'bootscript.rcS'
61
62default_mem_size= "2GB"
63
64
65class BigCluster(devices.CpuCluster):
66    def __init__(self, system, num_cpus, cpu_clock,
67                 cpu_voltage="1.0V"):
68        cpu_config = [ CpuConfig.get("arm_detailed"), devices.L1I, devices.L1D,
69                    devices.WalkCache, devices.L2 ]
70        super(BigCluster, self).__init__(system, num_cpus, cpu_clock,
71                                         cpu_voltage, *cpu_config)
72
73class LittleCluster(devices.CpuCluster):
74    def __init__(self, system, num_cpus, cpu_clock,
75                 cpu_voltage="1.0V"):
76        cpu_config = [ CpuConfig.get("minor"), devices.L1I, devices.L1D,
77                       devices.WalkCache, devices.L2 ]
78        super(LittleCluster, self).__init__(system, num_cpus, cpu_clock,
79                                         cpu_voltage, *cpu_config)
80
81
82def createSystem(caches, kernel, bootscript, disks=[]):
83    sys = devices.SimpleSystem(caches, default_mem_size,
84                               kernel=SysPaths.binary(kernel),
85                               readfile=bootscript,
86                               machine_type="DTOnly")
87
88    sys.mem_ctrls = SimpleMemory(range=sys._mem_range)
89    sys.mem_ctrls.port = sys.membus.master
90
91    sys.connect()
92
93    # Attach disk images
94    if disks:
95        def cow_disk(image_file):
96            image = CowDiskImage()
97            image.child.image_file = SysPaths.disk(image_file)
98            return image
99
100        sys.disk_images = [ cow_disk(f) for f in disks ]
101        sys.pci_vio_block = [ PciVirtIO(vio=VirtIOBlock(image=img))
102                              for img in sys.disk_images ]
103        for dev in sys.pci_vio_block:
104            sys.attach_pci(dev)
105
106    sys.realview.setupBootLoader(sys.membus, sys, SysPaths.binary)
107
108    return sys
109
110
111def main():
112    parser = argparse.ArgumentParser(
113        description="Generic ARM big.LITTLE configuration")
114
115    parser.add_argument("--restore-from", type=str, default=None,
116                        help="Restore from checkpoint")
117    parser.add_argument("--dtb", type=str, default=default_dtb,
118                        help="DTB file to load")
119    parser.add_argument("--kernel", type=str, default=default_kernel,
120                        help="Linux kernel")
121    parser.add_argument("--disk", action="append", type=str, default=[],
122                        help="Disks to instantiate")
123    parser.add_argument("--bootscript", type=str, default=default_rcs,
124                        help="Linux bootscript")
125    parser.add_argument("--atomic", action="store_true", default=False,
126                        help="Use atomic CPUs")
127    parser.add_argument("--kernel-init", type=str, default="/sbin/init",
128                        help="Override init")
129    parser.add_argument("--big-cpus", type=int, default=1,
130                        help="Number of big CPUs to instantiate")
131    parser.add_argument("--little-cpus", type=int, default=1,
132                        help="Number of little CPUs to instantiate")
133    parser.add_argument("--caches", action="store_true", default=False,
134                        help="Instantiate caches")
135    parser.add_argument("--last-cache-level", type=int, default=2,
136                        help="Last level of caches (e.g. 3 for L3)")
137    parser.add_argument("--big-cpu-clock", type=str, default="2GHz",
138                        help="Big CPU clock frequency")
139    parser.add_argument("--little-cpu-clock", type=str, default="1GHz",
140                        help="Little CPU clock frequency")
141
142    m5.ticks.fixGlobalFrequency()
143
144    options = parser.parse_args()
145
146    kernel_cmd = [
147        "earlyprintk=pl011,0x1c090000",
148        "console=ttyAMA0",
149        "lpj=19988480",
150        "norandmaps",
151        "loglevel=8",
152        "mem=%s" % default_mem_size,
153        "root=/dev/vda1",
154        "rw",
155        "init=%s" % options.kernel_init,
156        "vmalloc=768MB",
157    ]
158
159    root = Root(full_system=True)
160
161    disks = [default_disk] if len(options.disk) == 0 else options.disk
162    system = createSystem(options.caches,
163                          options.kernel,
164                          options.bootscript,
165                          disks=disks)
166
167    root.system = system
168    system.boot_osflags = " ".join(kernel_cmd)
169
170    AtomicCluster = devices.AtomicCluster
171
172    if options.big_cpus + options.little_cpus == 0:
173        m5.util.panic("Empty CPU clusters")
174
175    # big cluster
176    if options.big_cpus > 0:
177        if options.atomic:
178            system.bigCluster = AtomicCluster(system, options.big_cpus,
179                                              options.big_cpu_clock)
180        else:
181            system.bigCluster = BigCluster(system, options.big_cpus,
182                                           options.big_cpu_clock)
183        mem_mode = system.bigCluster.memoryMode()
184    # little cluster
185    if options.little_cpus > 0:
186        if options.atomic:
187            system.littleCluster = AtomicCluster(system, options.little_cpus,
188                                                 options.little_cpu_clock)
189
190        else:
191            system.littleCluster = LittleCluster(system, options.little_cpus,
192                                                 options.little_cpu_clock)
193        mem_mode = system.littleCluster.memoryMode()
194
195    if options.big_cpus > 0 and options.little_cpus > 0:
196        if system.bigCluster.memoryMode() != system.littleCluster.memoryMode():
197            m5.util.panic("Memory mode missmatch among CPU clusters")
198    system.mem_mode = mem_mode
199
200    # create caches
201    system.addCaches(options.caches, options.last_cache_level)
202    if not options.caches:
203        if options.big_cpus > 0 and system.bigCluster.requireCaches():
204            m5.util.panic("Big CPU model requires caches")
205        if options.little_cpus > 0 and system.littleCluster.requireCaches():
206            m5.util.panic("Little CPU model requires caches")
207
208    # Linux device tree
209    system.dtb_filename = SysPaths.binary(options.dtb)
210
211    # Get and load from the chkpt or simpoint checkpoint
212    if options.restore_from is not None:
213        m5.instantiate(options.restore_from)
214    else:
215        m5.instantiate()
216
217    # start simulation (and drop checkpoints when requested)
218    while True:
219        event = m5.simulate()
220        exit_msg = event.getCause()
221        if exit_msg == "checkpoint":
222            print "Dropping checkpoint at tick %d" % m5.curTick()
223            cpt_dir = os.path.join(m5.options.outdir, "cpt.%d" % m5.curTick())
224            m5.checkpoint(os.path.join(cpt_dir))
225            print "Checkpoint done."
226        else:
227            print exit_msg, " @ ", m5.curTick()
228            break
229
230    sys.exit(event.getCode())
231
232
233if __name__ == "__m5_main__":
234    main()
235