src/sim/power/ThermalModel.py

# Copyright (c) 2015 ARM Limited
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from m5.SimObject import *
from m5.objects.ClockedObject import ClockedObject

from m5.params import *
from m5.objects import ThermalDomain


# Represents a thermal node
class ThermalNode(SimObject):
    type = 'ThermalNode'
    cxx_header = "sim/power/thermal_node.hh"

# Represents a thermal resistor
class ThermalResistor(SimObject):
    type = 'ThermalResistor'
    cxx_header = "sim/power/thermal_model.hh"

    cxx_exports = [
        PyBindMethod("setNodes"),
    ]

    resistance = Param.Float(1.0, "Thermal resistance, expressed in Kelvin per Watt")

# Represents a thermal capacitor
class ThermalCapacitor(SimObject):
    type = 'ThermalCapacitor'
    cxx_header = "sim/power/thermal_model.hh"

    cxx_exports = [
        PyBindMethod("setNodes"),
    ]

    capacitance = Param.Float(1.0, "Thermal capacitance, expressed in Joules per Kelvin")

# Represents a fixed temperature node (ie. air)
class ThermalReference(SimObject, object):
    type = 'ThermalReference'
    cxx_header = "sim/power/thermal_model.hh"

    cxx_exports = [
        PyBindMethod("setNode"),
    ]

    # Static temperature which may change over time
    temperature = Param.Float(25.0, "Operational temperature in Celsius")


# Represents a thermal capacitor
class ThermalModel(ClockedObject):
    type = 'ThermalModel'
    cxx_header = "sim/power/thermal_model.hh"

    cxx_exports = [
        PyBindMethod("addCapacitor"),
        PyBindMethod("addResistor"),
        PyBindMethod("addReference"),
        PyBindMethod("addDomain"),
        PyBindMethod("addNode"),
        PyBindMethod("doStep"),
    ]

    step = Param.Float(0.01, "Simulation step (in seconds) for thermal simulation")

    def populate(self):
        if not hasattr(self,"_capacitors"): self._capacitors = []
        if not hasattr(self,"_resistors"): self._resistors = []
        if not hasattr(self,"_domains"): self._domains = []
        if not hasattr(self,"_references"): self._references = []
        if not hasattr(self,"_nodes"): self._nodes = []

    def init(self):
        self.populate()

        for ref, node in self._references:
            ref.getCCObject().setNode(node.getCCObject())
            self.getCCObject().addReference(ref.getCCObject())

        for dom, node in self._domains:
            dom.getCCObject().setNode(node.getCCObject())
            self.getCCObject().addDomain(dom.getCCObject())

        for cap, node1, node2 in self._capacitors:
            cap.getCCObject().setNodes(node1.getCCObject(), node2.getCCObject())
            self.getCCObject().addCapacitor(cap.getCCObject())

        for res, node1, node2 in self._resistors:
            res.getCCObject().setNodes(node1.getCCObject(), node2.getCCObject())
            self.getCCObject().addResistor(res.getCCObject())

        for node in self._nodes:
            self.getCCObject().addNode(node.getCCObject())

    def addCapacitor(self, cap, node1, node2):
        self.populate()
        self._capacitors.append( (cap, node1, node2) )
        self._parent.thermal_components.append(cap)
        self.addNodes(node1,node2)

    def addResistor(self, res, node1, node2):
        self.populate()
        self._resistors.append( (res, node1, node2) )
        self._parent.thermal_components.append(res)
        self.addNodes(node1,node2)

    def addReference(self, ref, node):
        self.populate()
        self._references.append( (ref, node) )
        self._parent.thermal_components.append(ref)
        self.addNodes(node)

    def addDomain(self, dom, node):
        self.populate()
        self._domains.append( (dom, node) )
        self.addNodes(node)

    def addNodes(self, *nodes):
        for node in nodes:
            if node not in self._nodes:
                self._nodes.append(node)
                self._parent.thermal_components.append(node)

    def doStep(self):
        self.getCCObject().doStep()