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/*
* Copyright (c) 2014-2017 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: Anthony Gutierrez,
* Brad Beckmann,
* Sooraj Puthoor
*/
#ifndef __FETCH_UNIT_HH__
#define __FETCH_UNIT_HH__
#include <string>
#include <utility>
#include <vector>
#include "arch/gpu_decoder.hh"
#include "base/statistics.hh"
#include "config/the_gpu_isa.hh"
#include "gpu-compute/scheduler.hh"
#include "mem/packet.hh"
class ComputeUnit;
class Wavefront;
class FetchUnit
{
public:
FetchUnit(const ComputeUnitParams* params);
~FetchUnit();
void init(ComputeUnit *cu);
void exec();
void bindWaveList(std::vector<Wavefront*> *list);
void initiateFetch(Wavefront *wavefront);
void fetch(PacketPtr pkt, Wavefront *wavefront);
void processFetchReturn(PacketPtr pkt);
static uint32_t globalFetchUnitID;
private:
bool timingSim;
ComputeUnit *computeUnit;
TheGpuISA::Decoder decoder;
// Fetch scheduler; Selects one wave from
// the fetch queue for instruction fetching.
// The selection is made according to
// a scheduling policy
Scheduler fetchScheduler;
// Stores the list of waves that are
// ready to be fetched this cycle
std::vector<Wavefront*> fetchQueue;
// Stores the fetch status of all waves dispatched to this SIMD.
// TRUE implies the wave is ready to fetch and is already
// moved to fetchQueue
std::vector<std::pair<Wavefront*, bool>> fetchStatusQueue;
// Pointer to list of waves dispatched on to this SIMD unit
std::vector<Wavefront*> *waveList;
};
#endif // __FETCH_UNIT_HH__
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