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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.
*
* Author: John Kalamatianos, Sooraj Puthoor
*/
#ifndef __GLOBAL_MEMORY_PIPELINE_HH__
#define __GLOBAL_MEMORY_PIPELINE_HH__
#include <queue>
#include <string>
#include "gpu-compute/misc.hh"
#include "params/ComputeUnit.hh"
#include "sim/stats.hh"
/*
* @file global_memory_pipeline.hh
*
* The global memory pipeline issues newly created global memory packets
* from the pipeline to DTLB. The exec() method of the memory packet issues
* the packet to the DTLB if there is space available in the return fifo.
* This stage also retires previously issued loads and stores that have
* returned from the memory sub-system.
*/
class ComputeUnit;
class GlobalMemPipeline
{
public:
GlobalMemPipeline(const ComputeUnitParams *params);
void init(ComputeUnit *cu);
void exec();
template<typename c0, typename c1> void doGmReturn(GPUDynInstPtr m);
std::queue<GPUDynInstPtr> &getGMReqFIFO() { return gmIssuedRequests; }
std::queue<GPUDynInstPtr> &getGMStRespFIFO() { return gmReturnedStores; }
std::queue<GPUDynInstPtr> &getGMLdRespFIFO() { return gmReturnedLoads; }
bool
isGMLdRespFIFOWrRdy() const
{
return gmReturnedLoads.size() < gmQueueSize;
}
bool
isGMStRespFIFOWrRdy() const
{
return gmReturnedStores.size() < gmQueueSize;
}
bool
isGMReqFIFOWrRdy(uint32_t pendReqs=0) const
{
return (gmIssuedRequests.size() + pendReqs) < gmQueueSize;
}
const std::string &name() const { return _name; }
void regStats();
private:
ComputeUnit *computeUnit;
std::string _name;
int gmQueueSize;
// number of cycles of delaying the update of a VGPR that is the
// target of a load instruction (or the load component of an atomic)
// The delay is due to VRF bank conflicts
Stats::Scalar loadVrfBankConflictCycles;
// Counters to track the inflight loads and stores
// so that we can provide the proper backpressure
// on the number of inflight memory operations.
int inflightStores;
int inflightLoads;
// The size of global memory.
int globalMemSize;
// Global Memory Request FIFO: all global memory requests
// are issued to this FIFO from the memory pipelines
std::queue<GPUDynInstPtr> gmIssuedRequests;
// Globa Store Response FIFO: all responses of global memory
// stores are sent to this FIFO from TCP
std::queue<GPUDynInstPtr> gmReturnedStores;
// Global Load Response FIFO: all responses of global memory
// loads are sent to this FIFO from TCP
std::queue<GPUDynInstPtr> gmReturnedLoads;
};
#endif // __GLOBAL_MEMORY_PIPELINE_HH__
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