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/*
* 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.
*
* Authors: Sooraj Puthoor
*/
#include "gpu-compute/local_memory_pipeline.hh"
#include "debug/GPUPort.hh"
#include "gpu-compute/compute_unit.hh"
#include "gpu-compute/gpu_dyn_inst.hh"
#include "gpu-compute/shader.hh"
#include "gpu-compute/vector_register_file.hh"
#include "gpu-compute/wavefront.hh"
LocalMemPipeline::LocalMemPipeline(const ComputeUnitParams* p) :
computeUnit(nullptr), lmQueueSize(p->local_mem_queue_size)
{
}
void
LocalMemPipeline::init(ComputeUnit *cu)
{
computeUnit = cu;
_name = computeUnit->name() + ".LocalMemPipeline";
}
void
LocalMemPipeline::exec()
{
// apply any returned shared (LDS) memory operations
GPUDynInstPtr m = !lmReturnedRequests.empty() ?
lmReturnedRequests.front() : nullptr;
bool accessVrf = true;
Wavefront *w = nullptr;
if ((m) && (m->isLoad() || m->isAtomicRet())) {
w = m->wavefront();
accessVrf =
w->computeUnit->vrf[w->simdId]->
vrfOperandAccessReady(m->seqNum(), w, m,
VrfAccessType::WRITE);
}
if (!lmReturnedRequests.empty() && m->latency.rdy() && accessVrf &&
computeUnit->locMemToVrfBus.rdy() && (computeUnit->shader->coissue_return
|| computeUnit->wfWait.at(m->pipeId).rdy())) {
lmReturnedRequests.pop();
w = m->wavefront();
m->completeAcc(m);
// Decrement outstanding request count
computeUnit->shader->ScheduleAdd(&w->outstandingReqs, m->time, -1);
if (m->isStore() || m->isAtomic()) {
computeUnit->shader->ScheduleAdd(&w->outstandingReqsWrLm,
m->time, -1);
}
if (m->isLoad() || m->isAtomic()) {
computeUnit->shader->ScheduleAdd(&w->outstandingReqsRdLm,
m->time, -1);
}
// Mark write bus busy for appropriate amount of time
computeUnit->locMemToVrfBus.set(m->time);
if (computeUnit->shader->coissue_return == 0)
w->computeUnit->wfWait.at(m->pipeId).set(m->time);
}
// If pipeline has executed a local memory instruction
// execute local memory packet and issue the packets
// to LDS
if (!lmIssuedRequests.empty() && lmReturnedRequests.size() < lmQueueSize) {
GPUDynInstPtr m = lmIssuedRequests.front();
bool returnVal = computeUnit->sendToLds(m);
if (!returnVal) {
DPRINTF(GPUPort, "packet was nack'd and put in retry queue");
}
lmIssuedRequests.pop();
}
}
void
LocalMemPipeline::regStats()
{
loadVrfBankConflictCycles
.name(name() + ".load_vrf_bank_conflict_cycles")
.desc("total number of cycles LDS data are delayed before updating "
"the VRF")
;
}
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