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 44#include <vector> 45 46#include "base/statistics.hh" 47#include "params/VoltageDomain.hh" 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{ 58 public: 59 60 typedef VoltageDomainParams Params; 61 VoltageDomain(const Params *p); 62
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63 typedef SrcClockDomain::PerfLevel PerfLevel; 64 |
65 /** 66 * Get the current voltage. 67 * 68 * @return Voltage of the domain 69 */ 70 double voltage() const { return voltageOpPoints[_perfLevel]; } 71
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72 /** 73 * Get the voltage at specified performance level. 74 * 75 * @param perf_level Performance level for which the voltage is requested 76 * @return Voltage of the domain at specified performance level 77 */ 78 double voltage(PerfLevel perf_level) const 79 { 80 return voltageOpPoints[perf_level]; 81 } 82 |
83 uint32_t numVoltages() const { return (uint32_t)voltageOpPoints.size(); } 84
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72 typedef SrcClockDomain::PerfLevel PerfLevel;
73
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85 /** 86 * Set the voltage point of the domain. 87 * @param Voltage value to be set 88 */ 89 void perfLevel(PerfLevel perf_level); 90 91 /** 92 * Get the voltage point of the domain. 93 * @param Voltage value to be set 94 */ 95 PerfLevel perfLevel() const { return _perfLevel; } 96 97 /** 98 * Register a SrcClockDomain with this voltage domain. 99 * @param src_clock_domain The SrcClockDomain to register. 100 */ 101 void registerSrcClockDom(SrcClockDomain *src_clock_dom) { 102 assert(src_clock_dom->voltageDomain() == this); 103 srcClockChildren.push_back(src_clock_dom); 104 } 105 106 /** 107 * Startup has all SrcClockDomains registered with this voltage domain, so 108 * try to make sure that all perf level requests from them are met. 109 */ 110 void startup(); 111 112 /** 113 * Recomputes the highest (fastest, i.e., numerically lowest) requested 114 * performance level of all associated clock domains, and updates the 115 * performance level of this voltage domain to match. This means that for 116 * two connected clock domains, one fast and one slow, the voltage domain 117 * will provide the voltage associated with the fast DVFS operation point. 118 * Must be called whenever a clock domain decides to swtich its performance 119 * level. 120 * 121 * @return True, if the voltage was actually changed. 122 */ 123 bool sanitiseVoltages(); 124 125 void regStats(); 126 127 void serialize(std::ostream &os); 128 void unserialize(Checkpoint *cp, const std::string §ion); 129 private: 130 typedef std::vector<double> Voltages; 131 /** 132 * List of possible minimum voltage at each of the frequency operational 133 * points, should be in descending order and same size as freqOpPoints. 134 * An empty list corresponds to default voltage specified for the voltage 135 * domain its clock domain belongs. The same voltage is applied for each 136 * freqOpPoints, overall implying NO DVS 137 */ 138 const Voltages voltageOpPoints; 139 PerfLevel _perfLevel; 140 141 /** 142 * Stat for reporting voltage of the domain 143 */ 144 Stats::Value currentVoltage; 145 146 /** 147 * List of associated SrcClockDomains that are connected to this voltage 148 * domain. 149 */ 150 typedef std::vector<SrcClockDomain *> SrcClockChildren; 151 SrcClockChildren srcClockChildren; 152}; 153 154#endif
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