diff options
Diffstat (limited to 'src/gpu-compute/scoreboard_check_stage.cc')
| -rw-r--r-- | src/gpu-compute/scoreboard_check_stage.cc | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/gpu-compute/scoreboard_check_stage.cc b/src/gpu-compute/scoreboard_check_stage.cc new file mode 100644 index 000000000..0d856a9b0 --- /dev/null +++ b/src/gpu-compute/scoreboard_check_stage.cc @@ -0,0 +1,173 @@ +/* + * Copyright (c) 2014-2015 Advanced Micro Devices, Inc. + * All rights reserved. + * + * For use for simulation and test purposes only + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. 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. + * + * 3. Neither the name of the copyright holder 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 HOLDER 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. + * + * Author: Sooraj Puthoor + */ + +#include "gpu-compute/scoreboard_check_stage.hh" + +#include "gpu-compute/compute_unit.hh" +#include "gpu-compute/gpu_static_inst.hh" +#include "gpu-compute/shader.hh" +#include "gpu-compute/wavefront.hh" +#include "params/ComputeUnit.hh" + +ScoreboardCheckStage::ScoreboardCheckStage(const ComputeUnitParams *p) + : numSIMDs(p->num_SIMDs), + numMemUnits(p->num_global_mem_pipes + p->num_shared_mem_pipes), + numGlbMemPipes(p->num_global_mem_pipes), + numShrMemPipes(p->num_shared_mem_pipes), + vectorAluInstAvail(nullptr), + lastGlbMemSimd(-1), + lastShrMemSimd(-1), glbMemInstAvail(nullptr), + shrMemInstAvail(nullptr) +{ +} + +ScoreboardCheckStage::~ScoreboardCheckStage() +{ + readyList.clear(); + waveStatusList.clear(); + shrMemInstAvail = nullptr; + glbMemInstAvail = nullptr; +} + +void +ScoreboardCheckStage::init(ComputeUnit *cu) +{ + computeUnit = cu; + _name = computeUnit->name() + ".ScoreboardCheckStage"; + + for (int unitId = 0; unitId < numSIMDs + numMemUnits; ++unitId) { + readyList.push_back(&computeUnit->readyList[unitId]); + } + + for (int unitId = 0; unitId < numSIMDs; ++unitId) { + waveStatusList.push_back(&computeUnit->waveStatusList[unitId]); + } + + vectorAluInstAvail = &computeUnit->vectorAluInstAvail; + glbMemInstAvail= &computeUnit->glbMemInstAvail; + shrMemInstAvail= &computeUnit->shrMemInstAvail; +} + +void +ScoreboardCheckStage::initStatistics() +{ + lastGlbMemSimd = -1; + lastShrMemSimd = -1; + *glbMemInstAvail = 0; + *shrMemInstAvail = 0; + + for (int unitId = 0; unitId < numSIMDs; ++unitId) + vectorAluInstAvail->at(unitId) = false; +} + +void +ScoreboardCheckStage::collectStatistics(Wavefront *curWave, int unitId) +{ + if (curWave->instructionBuffer.empty()) + return; + + // track which vector SIMD unit has at least one WV with a vector + // ALU as the oldest instruction in its Instruction buffer + vectorAluInstAvail->at(unitId) = vectorAluInstAvail->at(unitId) || + curWave->isOldestInstALU(); + + // track how many vector SIMD units have at least one WV with a + // vector Global memory instruction as the oldest instruction + // in its Instruction buffer + if ((curWave->isOldestInstGMem() || curWave->isOldestInstPrivMem() || + curWave->isOldestInstFlatMem()) && lastGlbMemSimd != unitId && + *glbMemInstAvail <= 1) { + (*glbMemInstAvail)++; + lastGlbMemSimd = unitId; + } + + // track how many vector SIMD units have at least one WV with a + // vector shared memory (LDS) instruction as the oldest instruction + // in its Instruction buffer + // TODO: parametrize the limit of the LDS units + if (curWave->isOldestInstLMem() && (*shrMemInstAvail <= numShrMemPipes) && + lastShrMemSimd != unitId) { + (*shrMemInstAvail)++; + lastShrMemSimd = unitId; + } +} + +void +ScoreboardCheckStage::exec() +{ + initStatistics(); + + // reset the ready list for all execution units; it will be + // constructed every cycle since resource availability may change + for (int unitId = 0; unitId < numSIMDs + numMemUnits; ++unitId) { + readyList[unitId]->clear(); + } + + // iterate over the Wavefronts of all SIMD units + for (int unitId = 0; unitId < numSIMDs; ++unitId) { + for (int wvId = 0; wvId < computeUnit->shader->n_wf; ++wvId) { + // reset the ready status of each wavefront + waveStatusList[unitId]->at(wvId).second = BLOCKED; + Wavefront *curWave = waveStatusList[unitId]->at(wvId).first; + collectStatistics(curWave, unitId); + + if (curWave->ready(Wavefront::I_ALU)) { + readyList[unitId]->push_back(curWave); + waveStatusList[unitId]->at(wvId).second = READY; + } else if (curWave->ready(Wavefront::I_GLOBAL)) { + if (computeUnit->cedeSIMD(unitId, wvId)) { + continue; + } + + readyList[computeUnit->GlbMemUnitId()]->push_back(curWave); + waveStatusList[unitId]->at(wvId).second = READY; + } else if (curWave->ready(Wavefront::I_SHARED)) { + readyList[computeUnit->ShrMemUnitId()]->push_back(curWave); + waveStatusList[unitId]->at(wvId).second = READY; + } else if (curWave->ready(Wavefront::I_FLAT)) { + readyList[computeUnit->GlbMemUnitId()]->push_back(curWave); + waveStatusList[unitId]->at(wvId).second = READY; + } else if (curWave->ready(Wavefront::I_PRIVATE)) { + readyList[computeUnit->GlbMemUnitId()]->push_back(curWave); + waveStatusList[unitId]->at(wvId).second = READY; + } + } + } +} + +void +ScoreboardCheckStage::regStats() +{ +} |