7cfb59d6e5
This patch adds some basic support for power models in gem5. The power interface is defined so it can interact with thermal models as well. It implements a simple power evaluator that can be used for simple power models that express power in the form of a math expression. These expressions can use stats within the same SimObject (or down its hierarchy) and some magic variables such as "temp" for temperature. In future patches we will extend this functionality to allow slightly more complex expressions. The model allows it to be extended to use other kinds of models. Change-Id: I76752f9638b6815e229fd74cdcb7721a305cbc4b
80 lines
3.9 KiB
Python
80 lines
3.9 KiB
Python
# Copyright (c) 2012, 2015-2016 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: Andreas Hansson
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from m5.SimObject import SimObject
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from m5.params import *
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from m5.proxy import *
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# Enumerate set of allowed power states that can be used by a clocked object.
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# The list is kept generic to express a base minimal set.
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# State definition :-
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# Undefined: Invalid state, no power state derived information is available.
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# On: The logic block is actively running and consuming dynamic and leakage
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# energy depending on the amount of processing required.
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# Clk_gated: The clock circuity within the block is gated to save dynamic
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# energy, the power supply to the block is still on and leakage
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# energy is being consumed by the block.
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# Sram_retention: The SRAMs within the logic blocks are pulled into retention
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# state to reduce leakage energy further.
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# Off: The logic block is power gated and is not consuming any energy.
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class PwrState(Enum): vals = ['UNDEFINED',
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'ON',
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'CLK_GATED',
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'SRAM_RETENTION',
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'OFF']
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class ClockedObject(SimObject):
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type = 'ClockedObject'
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abstract = True
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cxx_header = "sim/clocked_object.hh"
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# The clock domain this clocked object belongs to, inheriting the
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# parent's clock domain by default
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clk_domain = Param.ClockDomain(Parent.clk_domain, "Clock domain")
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# Power model for this ClockedObject
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power_model = Param.PowerModel(NULL, "Power model")
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# Provide initial power state, should ideally get redefined in startup
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# routine
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default_p_state = Param.PwrState("UNDEFINED", "Default Power State")
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p_state_clk_gate_min = Param.Latency('1ns',"Min value of the distribution")
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p_state_clk_gate_max = Param.Latency('1s',"Max value of the distribution")
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p_state_clk_gate_bins = Param.Unsigned('20',
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"# bins in clk gated distribution")
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