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/*
* Copyright (c) 2012 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: Vasileios Spiliopoulos
* Akash Bagdia
*/
#ifndef __SIM_VOLTAGE_DOMAIN_HH__
#define __SIM_VOLTAGE_DOMAIN_HH__
#include <vector>
#include "base/statistics.hh"
#include "params/VoltageDomain.hh"
#include "sim/clock_domain.hh"
#include "sim/sim_object.hh"
/**
* A VoltageDomain is used to group clock domains that operate under
* the same voltage. The class provides methods for setting and
* getting the voltage.
*/
class VoltageDomain : public SimObject
{
public:
typedef VoltageDomainParams Params;
VoltageDomain(const Params *p);
typedef SrcClockDomain::PerfLevel PerfLevel;
/**
* Get the current voltage.
*
* @return Voltage of the domain
*/
double voltage() const { return voltageOpPoints[_perfLevel]; }
/**
* Get the voltage at specified performance level.
*
* @param perf_level Performance level for which the voltage is requested
* @return Voltage of the domain at specified performance level
*/
double voltage(PerfLevel perf_level) const
{
chatty_assert(perf_level < numVoltages(), "VoltageDomain %s "\
"request for voltage perf level %u is outside "\
"of numVoltages %u", name(), perf_level,
numVoltages());
return voltageOpPoints[perf_level];
}
uint32_t numVoltages() const { return (uint32_t)voltageOpPoints.size(); }
/**
* Set the voltage point of the domain.
* @param Voltage value to be set
*/
void perfLevel(PerfLevel perf_level);
/**
* Get the voltage point of the domain.
* @param Voltage value to be set
*/
PerfLevel perfLevel() const { return _perfLevel; }
/**
* Register a SrcClockDomain with this voltage domain.
* @param src_clock_domain The SrcClockDomain to register.
*/
void registerSrcClockDom(SrcClockDomain *src_clock_dom) {
assert(src_clock_dom->voltageDomain() == this);
srcClockChildren.push_back(src_clock_dom);
}
/**
* Startup has all SrcClockDomains registered with this voltage domain, so
* try to make sure that all perf level requests from them are met.
*/
void startup() override;
/**
* Recomputes the highest (fastest, i.e., numerically lowest) requested
* performance level of all associated clock domains, and updates the
* performance level of this voltage domain to match. This means that for
* two connected clock domains, one fast and one slow, the voltage domain
* will provide the voltage associated with the fast DVFS operation point.
* Must be called whenever a clock domain decides to swtich its performance
* level.
*
* @return True, if the voltage was actually changed.
*/
bool sanitiseVoltages();
void regStats() override;
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
private:
typedef std::vector<double> Voltages;
/**
* List of possible minimum voltage at each of the frequency operational
* points, should be in descending order and same size as freqOpPoints.
* An empty list corresponds to default voltage specified for the voltage
* domain its clock domain belongs. The same voltage is applied for each
* freqOpPoints, overall implying NO DVS
*/
const Voltages voltageOpPoints;
PerfLevel _perfLevel;
/**
* Stat for reporting voltage of the domain
*/
Stats::Value currentVoltage;
/**
* List of associated SrcClockDomains that are connected to this voltage
* domain.
*/
typedef std::vector<SrcClockDomain *> SrcClockChildren;
SrcClockChildren srcClockChildren;
};
#endif
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