mathexpr_powermodel.hh revision 11800:54436a1784dc 
1/*
2 * Copyright (c) 2016 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: David Guillen Fandos
38 */
39
40#ifndef __SIM_MATHEXPR_POWERMODEL_PM_HH__
41#define __SIM_MATHEXPR_POWERMODEL_PM_HH__
42
43#include <unordered_map>
44
45#include "params/MathExprPowerModel.hh"
46#include "sim/mathexpr.hh"
47#include "sim/power/power_model.hh"
48
49namespace Stats {
50    class Info;
51}
52
53/**
54 * A Equation power model. The power is represented as a combination
55 * of some stats and automatic variables (like temperature).
56 */
57class MathExprPowerModel : public PowerModelState
58{
59  public:
60
61    typedef MathExprPowerModelParams Params;
62    MathExprPowerModel(const Params *p);
63
64    /**
65     * Get the dynamic power consumption.
66     *
67     * @return Power (Watts) consumed by this object (dynamic component)
68     */
69    double getDynamicPower() const {
70        return dyn_expr.eval(
71            std::bind(&MathExprPowerModel::getStatValue,
72                this, std::placeholders::_1)
73        );
74    }
75
76    /**
77     * Get the static power consumption.
78     *
79     * @return Power (Watts) consumed by this object (static component)
80     */
81    double getStaticPower() const {
82        return st_expr.eval(
83            std::bind(&MathExprPowerModel::getStatValue,
84                this, std::placeholders::_1)
85        );
86    }
87
88    /**
89     * Get the value for a variable (maps to a stat)
90     *
91     * @param name Name of the variable to retrieve the value from
92     *
93     * @return Power (Watts) consumed by this object (static component)
94     */
95    double getStatValue(const std::string & name) const;
96
97    void startup();
98
99    void regStats();
100
101  private:
102
103    // Math expressions for dynamic and static power
104    MathExpr dyn_expr, st_expr;
105
106    // Basename of the object in the gem5 stats hierachy
107    std::string basename;
108
109    // Map that contains relevant stats for this power model
110    std::unordered_map<std::string, Stats::Info*> stats_map;
111};
112
113#endif
114