1/* 2 * Copyright (c) 2012 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 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Vasileios Spiliopoulos 38 * Akash Bagdia 39 */ 40 41#ifndef __SIM_VOLTAGE_DOMAIN_HH__ 42#define __SIM_VOLTAGE_DOMAIN_HH__ 43
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44#include <vector> 45 |
46#include "base/statistics.hh" 47#include "params/VoltageDomain.hh"
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48#include "sim/clock_domain.hh" |
49#include "sim/sim_object.hh" 50 51/** 52 * A VoltageDomain is used to group clock domains that operate under 53 * the same voltage. The class provides methods for setting and 54 * getting the voltage. 55 */ 56class VoltageDomain : public SimObject 57{
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58 public: |
59
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56 private:
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60 typedef VoltageDomainParams Params; 61 VoltageDomain(const Params *p); |
62 63 /**
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59 * The voltage of the domain expressed in Volts
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64 * Get the current voltage. 65 * 66 * @return Voltage of the domain |
67 */
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61 double _voltage;
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68 double voltage() const { return voltageOpPoints[_perfLevel]; } |
69
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70 uint32_t numVoltages() const { return (uint32_t)voltageOpPoints.size(); } 71 72 typedef SrcClockDomain::PerfLevel PerfLevel; 73 |
74 /**
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64 * Stat for reporting voltage of the domain
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75 * Set the voltage point of the domain. 76 * @param Voltage value to be set |
77 */
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66 Stats::Value currentVoltage;
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78 void perfLevel(PerfLevel perf_level); |
79
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68 public:
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80 /** 81 * Get the voltage point of the domain. 82 * @param Voltage value to be set 83 */ 84 PerfLevel perfLevel() const { return _perfLevel; } |
85
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70 typedef VoltageDomainParams Params;
71 VoltageDomain(const Params *p);
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86 /** 87 * Register a SrcClockDomain with this voltage domain. 88 * @param src_clock_domain The SrcClockDomain to register. 89 */ 90 void registerSrcClockDom(SrcClockDomain *src_clock_dom) { 91 assert(src_clock_dom->voltageDomain() == this); 92 srcClockChildren.push_back(src_clock_dom); 93 } |
94 95 /**
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74 * Get the current volate.
75 *
76 * @return Voltage of the domain
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96 * Startup has all SrcClockDomains registered with this voltage domain, so 97 * try to make sure that all perf level requests from them are met. |
98 */
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78 inline double voltage() const { return _voltage; }
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99 void startup(); |
100 101 /**
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81 * Set the voltage of the domain.
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102 * Recomputes the highest (fastest, i.e., numerically lowest) requested 103 * performance level of all associated clock domains, and updates the 104 * performance level of this voltage domain to match. This means that for 105 * two connected clock domains, one fast and one slow, the voltage domain 106 * will provide the voltage associated with the fast DVFS operation point. 107 * Must be called whenever a clock domain decides to swtich its performance 108 * level. |
109 *
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83 * @param Voltage value to be set
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110 * @return True, if the voltage was actually changed. |
111 */
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85 void voltage(double voltage);
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112 bool sanitiseVoltages(); |
113 114 void regStats(); 115
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116 void serialize(std::ostream &os); 117 void unserialize(Checkpoint *cp, const std::string §ion); 118 private: 119 typedef std::vector<double> Voltages; 120 /** 121 * List of possible minimum voltage at each of the frequency operational 122 * points, should be in descending order and same size as freqOpPoints. 123 * An empty list corresponds to default voltage specified for the voltage 124 * domain its clock domain belongs. The same voltage is applied for each 125 * freqOpPoints, overall implying NO DVS 126 */ 127 const Voltages voltageOpPoints; 128 PerfLevel _perfLevel; 129 130 /** 131 * Stat for reporting voltage of the domain 132 */ 133 Stats::Value currentVoltage; 134 135 /** 136 * List of associated SrcClockDomains that are connected to this voltage 137 * domain. 138 */ 139 typedef std::vector<SrcClockDomain *> SrcClockChildren; 140 SrcClockChildren srcClockChildren; |
141}; 142 143#endif
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