| /* |
| * Copyright (c) 2012-2014, 2019 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 |
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| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "sim/voltage_domain.hh" |
| |
| #include <algorithm> |
| |
| #include "base/logging.hh" |
| #include "base/trace.hh" |
| #include "debug/VoltageDomain.hh" |
| #include "params/VoltageDomain.hh" |
| #include "sim/serialize.hh" |
| |
| namespace gem5 |
| { |
| |
| VoltageDomain::VoltageDomain(const Params &p) |
| : SimObject(p), voltageOpPoints(p.voltage), _perfLevel(0), stats(*this) |
| { |
| fatal_if(voltageOpPoints.empty(), "DVFS: Empty set of voltages for "\ |
| "voltage domain %s\n", name()); |
| |
| // Voltages must be sorted in descending order. |
| fatal_if(!std::is_sorted(voltageOpPoints.begin(), voltageOpPoints.end(), |
| std::greater<Voltages::value_type>()), "DVFS: Voltage operation "\ |
| "points not in descending order for voltage domain %s\n", |
| name()); |
| } |
| |
| void |
| VoltageDomain::perfLevel(PerfLevel perf_level) |
| { |
| gem5_assert(perf_level < voltageOpPoints.size(), |
| "DVFS: Requested voltage ID %d is outside the known "\ |
| "range for domain %s.\n", perf_level, name()); |
| |
| if (perf_level == _perfLevel) { |
| // Silently ignore identical overwrites |
| return; |
| } |
| |
| _perfLevel = perf_level; |
| |
| DPRINTF(VoltageDomain, "Setting voltage to %.3fV idx: %d for domain %s\n", |
| voltage(), perf_level, name()); |
| } |
| |
| bool |
| VoltageDomain::sanitiseVoltages() |
| { |
| if (numVoltages() == 1) |
| return false; |
| |
| // Find the highest requested performance level and update the voltage |
| // domain with it |
| PerfLevel perf_max = (PerfLevel)-1; |
| for (auto dit = srcClockChildren.begin(); dit != srcClockChildren.end(); |
| ++dit) { |
| SrcClockDomain* d = *dit; |
| gem5_assert(d->voltageDomain() == this, "DVFS: Clock domain %s "\ |
| "(id: %d) should not be registered with voltage domain "\ |
| "%s\n", d->name(), d->domainID(), name()); |
| |
| PerfLevel perf = d->perfLevel(); |
| |
| DPRINTF(VoltageDomain, "DVFS: Clock domain %s (id: %d) requests perf "\ |
| "level %d\n", d->name(), d->domainID(), perf); |
| |
| // NOTE: Descending sort of performance levels: 0 - fast, 5 - slow |
| if (perf < perf_max) { |
| DPRINTF(VoltageDomain, "DVFS: Updating max perf level %d -> %d\n", |
| perf_max, perf); |
| perf_max = perf; |
| } |
| } |
| DPRINTF(VoltageDomain, "DVFS: Setting perf level of voltage domain %s "\ |
| "from %d to %d.\n", name(), perfLevel(), perf_max); |
| |
| // Set the performance level |
| if (perf_max != perfLevel()) { |
| perfLevel(perf_max); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| void |
| VoltageDomain::startup() { |
| bool changed = sanitiseVoltages(); |
| if (changed) { |
| warn("DVFS: Perf level for voltage domain %s adapted to "\ |
| "requested perf levels from source clock domains.\n", name()); |
| } |
| } |
| |
| void |
| VoltageDomain::serialize(CheckpointOut &cp) const |
| { |
| SERIALIZE_SCALAR(_perfLevel); |
| } |
| |
| void |
| VoltageDomain::unserialize(CheckpointIn &cp) |
| { |
| UNSERIALIZE_SCALAR(_perfLevel); |
| perfLevel(_perfLevel); |
| } |
| |
| VoltageDomain::VoltageDomainStats::VoltageDomainStats(VoltageDomain &vd) |
| : statistics::Group(&vd), |
| ADD_STAT(voltage, statistics::units::Volt::get(), "Voltage in Volts") |
| { |
| voltage.method(&vd, &VoltageDomain::voltage); |
| } |
| |
| } // namespace gem5 |