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/*
* Copyright (c) 2015 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: Akash Bagdia
* David Guillen Fandos
*/
#include "sim/clocked_object.hh"
#include "base/misc.hh"
#include "sim/power/power_model.hh"
ClockedObject::ClockedObject(const ClockedObjectParams *p) :
SimObject(p), Clocked(*p->clk_domain),
_currPwrState(p->default_p_state),
prvEvalTick(0)
{
// Register the power_model with the object
if (p->power_model)
p->power_model->setClockedObject(this);
}
void
ClockedObject::serialize(CheckpointOut &cp) const
{
unsigned int currPwrState = (unsigned int)_currPwrState;
SERIALIZE_SCALAR(currPwrState);
SERIALIZE_SCALAR(prvEvalTick);
}
void
ClockedObject::unserialize(CheckpointIn &cp)
{
unsigned int currPwrState;
UNSERIALIZE_SCALAR(currPwrState);
UNSERIALIZE_SCALAR(prvEvalTick);
_currPwrState = Enums::PwrState(currPwrState);
}
void
ClockedObject::pwrState(Enums::PwrState p)
{
// Function should ideally be called only when there is a state change
if (_currPwrState == p) {
warn("ClockedObject: Already in the requested power state, request "\
"ignored");
return;
}
// No need to compute stats if in the same tick, update state
// though. This can happen in cases like a) during start of the
// simulation multiple state changes happens in init/startup phase,
// b) one takes a decision to migrate state but decides to reverts
// back to the original state in the same tick if other conditions
// are not met elsewhere. Any state change related stats would have
// been recorded on previous call to the pwrState() function.
if (prvEvalTick == curTick()) {
warn("ClockedObject: More than one power state change request "\
"encountered within the same simulation tick");
_currPwrState = p;
return;
}
// Record stats for previous state.
computeStats();
_currPwrState = p;
numPwrStateTransitions++;
}
void
ClockedObject::computeStats()
{
// Calculate time elapsed from last (valid) state change
Tick elapsed_time = curTick() - prvEvalTick;
pwrStateResidencyTicks[_currPwrState] += elapsed_time;
// Time spent in CLK_GATED state, this might change depending on
// transition to other low power states in respective simulation
// objects.
if (_currPwrState == Enums::PwrState::CLK_GATED) {
pwrStateClkGateDist.sample(elapsed_time);
}
prvEvalTick = curTick();
}
std::vector<double>
ClockedObject::pwrStateWeights() const
{
// Get residency stats
std::vector<double> ret;
Stats::VCounter residencies;
pwrStateResidencyTicks.value(residencies);
// Account for current state too!
Tick elapsed_time = curTick() - prvEvalTick;
residencies[_currPwrState] += elapsed_time;
ret.resize(Enums::PwrState::Num_PwrState);
for (unsigned i = 0; i < Enums::PwrState::Num_PwrState; i++)
ret[i] = residencies[i] /
(pwrStateResidencyTicks.total() + elapsed_time);
return ret;
}
void
ClockedObject::regStats()
{
SimObject::regStats();
using namespace Stats;
numPwrStateTransitions
.name(params()->name + ".numPwrStateTransitions")
.desc("Number of power state transitions")
;
// Each sample is time in ticks
unsigned num_bins = std::max(params()->p_state_clk_gate_bins, 10U);
pwrStateClkGateDist
.init(params()->p_state_clk_gate_min, params()->p_state_clk_gate_max,
(params()->p_state_clk_gate_max / num_bins))
.name(params()->name + ".pwrStateClkGateDist")
.desc("Distribution of time spent in the clock gated state")
.flags(pdf)
;
pwrStateResidencyTicks
.init(Enums::PwrState::Num_PwrState)
.name(params()->name + ".pwrStateResidencyTicks")
.desc("Cumulative time (in ticks) in various power states")
;
for (int i = 0; i < Enums::PwrState::Num_PwrState; i++) {
pwrStateResidencyTicks.subname(i, Enums::PwrStateStrings[i]);
}
numPwrStateTransitions = 0;
/**
* For every stats dump, the power state residency and other distribution
* stats should be computed just before the dump to ensure correct stats
* value being reported for current dump window. It avoids things like
* having any unreported time spent in a power state to be forwarded to the
* next dump window which might have rather unpleasant effects (like
* perturbing the distribution stats).
*/
registerDumpCallback(new ClockedObjectDumpCallback(this));
}
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