| # Copyright (c) 2017, 2020 ARM Limited |
| # All rights reserved. |
| # |
| # The license below extends only to copyright in the software and shall |
| # not be construed as granting a license to any other intellectual |
| # property including but not limited to intellectual property relating |
| # to a hardware implementation of the functionality of the software |
| # licensed hereunder. You may use the software subject to the license |
| # terms below provided that you ensure that this notice is replicated |
| # unmodified and in its entirety in all distributions of the software, |
| # modified or unmodified, in source code or in binary form. |
| # |
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| # 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 |
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| # 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 |
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| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| # This configuration file extends the example ARM big.LITTLE(tm) |
| # with example power models. |
| |
| import argparse |
| import os |
| |
| import m5 |
| from m5.objects import MathExprPowerModel, PowerModel |
| |
| import fs_bigLITTLE as bL |
| |
| |
| class CpuPowerOn(MathExprPowerModel): |
| def __init__(self, cpu_path, **kwargs): |
| super(CpuPowerOn, self).__init__(**kwargs) |
| # 2A per IPC, 3pA per cache miss |
| # and then convert to Watt |
| self.dyn = ( |
| "voltage * (2 * {}.ipc + 3 * 0.000000001 * " |
| "{}.dcache.overallMisses / simSeconds)".format(cpu_path, cpu_path) |
| ) |
| self.st = "4 * temp" |
| |
| |
| class CpuPowerOff(MathExprPowerModel): |
| dyn = "0" |
| st = "0" |
| |
| |
| class CpuPowerModel(PowerModel): |
| def __init__(self, cpu_path, **kwargs): |
| super(CpuPowerModel, self).__init__(**kwargs) |
| self.pm = [ |
| CpuPowerOn(cpu_path), # ON |
| CpuPowerOff(), # CLK_GATED |
| CpuPowerOff(), # SRAM_RETENTION |
| CpuPowerOff(), # OFF |
| ] |
| |
| |
| class L2PowerOn(MathExprPowerModel): |
| def __init__(self, l2_path, **kwargs): |
| super(L2PowerOn, self).__init__(**kwargs) |
| # Example to report l2 Cache overallAccesses |
| # The estimated power is converted to Watt and will vary based |
| # on the size of the cache |
| self.dyn = f"{l2_path}.overallAccesses * 0.000018000" |
| self.st = "(voltage * 3)/10" |
| |
| |
| class L2PowerOff(MathExprPowerModel): |
| dyn = "0" |
| st = "0" |
| |
| |
| class L2PowerModel(PowerModel): |
| def __init__(self, l2_path, **kwargs): |
| super(L2PowerModel, self).__init__(**kwargs) |
| # Choose a power model for every power state |
| self.pm = [ |
| L2PowerOn(l2_path), # ON |
| L2PowerOff(), # CLK_GATED |
| L2PowerOff(), # SRAM_RETENTION |
| L2PowerOff(), # OFF |
| ] |
| |
| |
| def main(): |
| parser = argparse.ArgumentParser( |
| description="Generic ARM big.LITTLE configuration with " |
| "example power models" |
| ) |
| bL.addOptions(parser) |
| options = parser.parse_args() |
| |
| if options.cpu_type != "timing": |
| m5.fatal("The power example script requires 'timing' CPUs.") |
| |
| root = bL.build(options) |
| |
| # Wire up some example power models to the CPUs |
| for cpu in root.system.descendants(): |
| if not isinstance(cpu, m5.objects.BaseCPU): |
| continue |
| |
| cpu.power_state.default_state = "ON" |
| cpu.power_model = CpuPowerModel(cpu.path()) |
| |
| # Example power model for the L2 Cache of the bigCluster |
| for l2 in root.system.bigCluster.l2.descendants(): |
| if not isinstance(l2, m5.objects.Cache): |
| continue |
| |
| l2.power_state.default_state = "ON" |
| l2.power_model = L2PowerModel(l2.path()) |
| |
| bL.instantiate(options) |
| |
| print("*" * 70) |
| print( |
| "WARNING: The power numbers generated by this script are " |
| "examples. They are not representative of any particular " |
| "implementation or process." |
| ) |
| print("*" * 70) |
| |
| # Dumping stats periodically |
| m5.stats.periodicStatDump(m5.ticks.fromSeconds(0.1e-3)) |
| bL.run() |
| |
| |
| if __name__ == "__m5_main__": |
| main() |