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Diffstat (limited to 'src/sim/power/thermal_model.hh')
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diff --git a/src/sim/power/thermal_model.hh b/src/sim/power/thermal_model.hh new file mode 100644 index 000000000..3cf44c55b --- /dev/null +++ b/src/sim/power/thermal_model.hh @@ -0,0 +1,206 @@ +/* + * Copyright (c) 2015 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. + * + * Redistribution and use in source and binary forms, with or without + * 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 + * contributors may be used to endorse or promote products derived from + * 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 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: David Guillen Fandos + */ + +#ifndef __SIM_THERMAL_MODEL_HH__ +#define __SIM_THERMAL_MODEL_HH__ + +#include <vector> + +#include "base/statistics.hh" +#include "params/ThermalCapacitor.hh" +#include "params/ThermalModel.hh" +#include "params/ThermalReference.hh" +#include "params/ThermalResistor.hh" +#include "sim/clocked_object.hh" +#include "sim/power/thermal_entity.hh" +#include "sim/sim_object.hh" + +class ThermalDomain; + + +/** + * A ThermalNode is used to connect thermal entities, such as + * resistors, capacitors, references and domains. It is the circuital + * equivalent to a voltage node. + */ +class ThermalNode : public SimObject +{ + public: + typedef SimObjectParams Params; + ThermalNode(const Params *p); + + int id; + bool isref; + double temp; +}; + +/** + * A ThermalResistor is used to model a thermal resistance between two + * thermal domains. This domains can be either a reference (fixed temp.) or + * a heat producer (power source). + */ +class ThermalResistor : public SimObject, public ThermalEntity +{ + public: + typedef ThermalResistorParams Params; + ThermalResistor(const Params *p); + + void serialize(CheckpointOut &cp) const override; + void unserialize(CheckpointIn &cp) override; + + void setNodes(ThermalNode * n1, ThermalNode * n2) { + node1 = n1; + node2 = n2; + } + + LinearEquation getEquation(ThermalNode * tn, unsigned n, + double step) const; + + private: + /* Resistance value in K/W */ + double _resistance; + /* Nodes connected to the resistor */ + ThermalNode * node1, * node2; +}; + +/** + * A ThermalCapacitor is used to model a thermal capacitance between two + * thermal domains. This domains can be either a reference (fixed temp.) or + * a heat producer (power source). + */ +class ThermalCapacitor : public SimObject, public ThermalEntity +{ + public: + typedef ThermalCapacitorParams Params; + ThermalCapacitor(const Params *p); + + void serialize(CheckpointOut &cp) const override; + void unserialize(CheckpointIn &cp) override; + + LinearEquation getEquation(ThermalNode * tn, unsigned n, + double step) const; + + void setNodes(ThermalNode * n1, ThermalNode * n2) { + node1 = n1; + node2 = n2; + } + + private: + /* Capacitance value in J/K */ + double _capacitance; + /* Nodes connected to the resistor */ + ThermalNode * node1, * node2; +}; + +/** + * A ThermalReference is a thermal domain with fixed temperature. + * It's the homologue to the voltage source in a circuit. + */ +class ThermalReference : public SimObject, public ThermalEntity +{ + public: + typedef ThermalReferenceParams Params; + ThermalReference(const Params *p); + + void setNode(ThermalNode * n) { + node = n; + } + + LinearEquation getEquation(ThermalNode * tn, unsigned n, + double step) const; + + void serialize(CheckpointOut &cp) const override; + void unserialize(CheckpointIn &cp) override; + + /* Fixed temperature value in centigrate degrees */ + double _temperature; + /* Nodes connected to the resistor */ + ThermalNode * node; +}; + + +/** + * A ThermalModel is the element which ties all thermal objects + * together and provides the thermal solver to the system. + * It is reponsible for updating temperature for all Thermal + * Domains over time by reading power from simobjects. + */ +class ThermalModel : public ClockedObject +{ + public: + typedef ThermalModelParams Params; + ThermalModel(const Params *p); + + void addDomain(ThermalDomain * d); + void addReference(ThermalReference * r); + void addCapacitor(ThermalCapacitor * c); + void addResistor(ThermalResistor * r); + + void addNode(ThermalNode * n) { nodes.push_back(n); } + + double getTemp() const; + + void startup(); + void doStep(); + + void serialize(CheckpointOut &cp) const override; + void unserialize(CheckpointIn &cp) override; + private: + + /* Keep track of all components used for the thermal model */ + std::vector <ThermalDomain *> domains; + std::vector <ThermalReference *> references; + std::vector <ThermalCapacitor *> capacitors; + std::vector <ThermalResistor *> resistors; + + std::vector <ThermalEntity *> entities; + + /* Keep a list of the instantiated nodes */ + std::vector <ThermalNode*> nodes; + std::vector <ThermalNode*> eq_nodes; + + /** Stepping event to update the model values */ + EventWrapper<ThermalModel, &ThermalModel::doStep> stepEvent; + + /** Step in seconds for thermal updates */ + double _step; + +}; + +#endif |