2016-01-19 20:28:22 +01:00
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/*
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* Copyright (c) 2014-2015 Advanced Micro Devices, Inc.
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* All rights reserved.
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*
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* For use for simulation and test purposes only
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Sooraj Puthoor
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*/
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#include "gpu-compute/local_memory_pipeline.hh"
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#include "debug/GPUPort.hh"
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#include "gpu-compute/compute_unit.hh"
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#include "gpu-compute/gpu_dyn_inst.hh"
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#include "gpu-compute/shader.hh"
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#include "gpu-compute/vector_register_file.hh"
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#include "gpu-compute/wavefront.hh"
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LocalMemPipeline::LocalMemPipeline(const ComputeUnitParams* p) :
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computeUnit(nullptr), lmQueueSize(p->local_mem_queue_size)
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{
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}
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void
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LocalMemPipeline::init(ComputeUnit *cu)
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{
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computeUnit = cu;
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_name = computeUnit->name() + ".LocalMemPipeline";
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}
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void
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LocalMemPipeline::exec()
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{
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// apply any returned shared (LDS) memory operations
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GPUDynInstPtr m = !lmReturnedRequests.empty() ?
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lmReturnedRequests.front() : nullptr;
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bool accessVrf = true;
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2016-10-27 04:47:19 +02:00
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Wavefront *w = nullptr;
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2016-10-27 04:47:11 +02:00
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if ((m) && (m->isLoad() || m->isAtomicRet())) {
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2016-10-27 04:47:19 +02:00
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w = m->wavefront();
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2016-01-19 20:28:22 +01:00
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accessVrf =
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2016-10-27 04:47:19 +02:00
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w->computeUnit->vrf[w->simdId]->
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2016-01-19 20:28:22 +01:00
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vrfOperandAccessReady(m->seqNum(), w, m,
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VrfAccessType::WRITE);
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}
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if (!lmReturnedRequests.empty() && m->latency.rdy() && accessVrf &&
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computeUnit->locMemToVrfBus.rdy() && (computeUnit->shader->coissue_return
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|| computeUnit->wfWait.at(m->pipeId).rdy())) {
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2016-10-27 04:47:19 +02:00
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lmReturnedRequests.pop();
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w = m->wavefront();
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m->completeAcc(m);
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// Decrement outstanding request count
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computeUnit->shader->ScheduleAdd(&w->outstandingReqs, m->time, -1);
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if (m->isStore() || m->isAtomic()) {
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computeUnit->shader->ScheduleAdd(&w->outstandingReqsWrLm,
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m->time, -1);
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}
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if (m->isLoad() || m->isAtomic()) {
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computeUnit->shader->ScheduleAdd(&w->outstandingReqsRdLm,
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m->time, -1);
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}
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// Mark write bus busy for appropriate amount of time
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computeUnit->locMemToVrfBus.set(m->time);
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if (computeUnit->shader->coissue_return == 0)
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w->computeUnit->wfWait.at(m->pipeId).set(m->time);
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2016-01-19 20:28:22 +01:00
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}
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// If pipeline has executed a local memory instruction
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// execute local memory packet and issue the packets
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// to LDS
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if (!lmIssuedRequests.empty() && lmReturnedRequests.size() < lmQueueSize) {
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GPUDynInstPtr m = lmIssuedRequests.front();
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bool returnVal = computeUnit->sendToLds(m);
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if (!returnVal) {
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DPRINTF(GPUPort, "packet was nack'd and put in retry queue");
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}
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lmIssuedRequests.pop();
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}
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}
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void
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LocalMemPipeline::regStats()
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{
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loadVrfBankConflictCycles
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.name(name() + ".load_vrf_bank_conflict_cycles")
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.desc("total number of cycles LDS data are delayed before updating "
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"the VRF")
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;
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}
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