fs_bigLITTLE.py revision 11682 
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(kernel, bootscript, disks=[]):
83    sys = devices.SimpleSystem(kernel=SysPaths.binary(kernel),
84                               readfile=bootscript,
85                               machine_type="DTOnly")
86
87    mem_region = sys.realview._mem_regions[0]
88    sys.mem_ctrls = SimpleMemory(
89        range=AddrRange(start=mem_region[0], size=default_mem_size))
90    sys.mem_ctrls.port = sys.membus.master
91
92    sys.connect()
93
94    # Attach disk images
95    if disks:
96        def cow_disk(image_file):
97            image = CowDiskImage()
98            image.child.image_file = SysPaths.disk(image_file)
99            return image
100
101        sys.disk_images = [ cow_disk(f) for f in disks ]
102        sys.pci_vio_block = [ PciVirtIO(vio=VirtIOBlock(image=img))
103                              for img in sys.disk_images ]
104        for dev in sys.pci_vio_block:
105            sys.attach_pci(dev)
106
107    sys.realview.setupBootLoader(sys.membus, sys, SysPaths.binary)
108
109    return sys
110
111
112def main():
113    parser = argparse.ArgumentParser(
114        description="Generic ARM big.LITTLE configuration")
115
116    parser.add_argument("--restore-from", type=str, default=None,
117                        help="Restore from checkpoint")
118    parser.add_argument("--dtb", type=str, default=default_dtb,
119                        help="DTB file to load")
120    parser.add_argument("--kernel", type=str, default=default_kernel,
121                        help="Linux kernel")
122    parser.add_argument("--disk", action="append", type=str, default=[],
123                        help="Disks to instantiate")
124    parser.add_argument("--bootscript", type=str, default=default_rcs,
125                        help="Linux bootscript")
126    parser.add_argument("--atomic", action="store_true", default=False,
127                        help="Use atomic CPUs")
128    parser.add_argument("--kernel-init", type=str, default="/sbin/init",
129                        help="Override init")
130    parser.add_argument("--big-cpus", type=int, default=1,
131                        help="Number of big CPUs to instantiate")
132    parser.add_argument("--little-cpus", type=int, default=1,
133                        help="Number of little CPUs to instantiate")
134    parser.add_argument("--caches", action="store_true", default=False,
135                        help="Instantiate caches")
136    parser.add_argument("--last-cache-level", type=int, default=2,
137                        help="Last level of caches (e.g. 3 for L3)")
138    parser.add_argument("--big-cpu-clock", type=str, default="2GHz",
139                        help="Big CPU clock frequency")
140    parser.add_argument("--little-cpu-clock", type=str, default="1GHz",
141                        help="Little CPU clock frequency")
142
143    m5.ticks.fixGlobalFrequency()
144
145    options = parser.parse_args()
146
147    kernel_cmd = [
148        "earlyprintk=pl011,0x1c090000",
149        "console=ttyAMA0",
150        "lpj=19988480",
151        "norandmaps",
152        "loglevel=8",
153        "mem=%s" % default_mem_size,
154        "root=/dev/vda1",
155        "rw",
156        "init=%s" % options.kernel_init,
157        "vmalloc=768MB",
158    ]
159
160    root = Root(full_system=True)
161
162    disks = default_disk if len(options.disk) == 0 else options.disk
163    system = createSystem(options.kernel, options.bootscript, disks=disks)
164
165    root.system = system
166    system.boot_osflags = " ".join(kernel_cmd)
167
168    AtomicCluster = devices.AtomicCluster
169
170    if options.big_cpus + options.little_cpus == 0:
171        m5.util.panic("Empty CPU clusters")
172
173    # big cluster
174    if options.big_cpus > 0:
175        if options.atomic:
176            system.bigCluster = AtomicCluster(system, options.big_cpus,
177                                              options.big_cpu_clock)
178        else:
179            system.bigCluster = BigCluster(system, options.big_cpus,
180                                           options.big_cpu_clock)
181        mem_mode = system.bigCluster.memoryMode()
182    # little cluster
183    if options.little_cpus > 0:
184        if options.atomic:
185            system.littleCluster = AtomicCluster(system, options.little_cpus,
186                                                 options.little_cpu_clock)
187
188        else:
189            system.littleCluster = LittleCluster(system, options.little_cpus,
190                                                 options.little_cpu_clock)
191        mem_mode = system.littleCluster.memoryMode()
192
193    if options.big_cpus > 0 and options.little_cpus > 0:
194        if system.bigCluster.memoryMode() != system.littleCluster.memoryMode():
195            m5.util.panic("Memory mode missmatch among CPU clusters")
196    system.mem_mode = mem_mode
197
198    # create caches
199    system.addCaches(options.caches, options.last_cache_level)
200    if not options.caches:
201        if options.big_cpus > 0 and system.bigCluster.requireCaches():
202            m5.util.panic("Big CPU model requires caches")
203        if options.little_cpus > 0 and system.littleCluster.requireCaches():
204            m5.util.panic("Little CPU model requires caches")
205
206    # Linux device tree
207    system.dtb_filename = SysPaths.binary(options.dtb)
208
209    # Get and load from the chkpt or simpoint checkpoint
210    if options.restore_from is not None:
211        m5.instantiate(options.restore_from)
212    else:
213        m5.instantiate()
214
215    # start simulation (and drop checkpoints when requested)
216    while True:
217        event = m5.simulate()
218        exit_msg = event.getCause()
219        if exit_msg == "checkpoint":
220            print "Dropping checkpoint at tick %d" % m5.curTick()
221            cpt_dir = os.path.join(m5.options.outdir, "cpt.%d" % m5.curTick())
222            m5.checkpoint(os.path.join(cpt_dir))
223            print "Checkpoint done."
224        else:
225            print exit_msg, " @ ", m5.curTick()
226            break
227
228    sys.exit(event.getCode())
229
230
231if __name__ == "__m5_main__":
232    main()
233