global_memory_pipeline.hh revision 11308
111308Santhony.gutierrez@amd.com/* 211308Santhony.gutierrez@amd.com * Copyright (c) 2014-2015 Advanced Micro Devices, Inc. 311308Santhony.gutierrez@amd.com * All rights reserved. 411308Santhony.gutierrez@amd.com * 511308Santhony.gutierrez@amd.com * For use for simulation and test purposes only 611308Santhony.gutierrez@amd.com * 711308Santhony.gutierrez@amd.com * Redistribution and use in source and binary forms, with or without 811308Santhony.gutierrez@amd.com * modification, are permitted provided that the following conditions are met: 911308Santhony.gutierrez@amd.com * 1011308Santhony.gutierrez@amd.com * 1. Redistributions of source code must retain the above copyright notice, 1111308Santhony.gutierrez@amd.com * this list of conditions and the following disclaimer. 1211308Santhony.gutierrez@amd.com * 1311308Santhony.gutierrez@amd.com * 2. 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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 2511308Santhony.gutierrez@amd.com * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 2611308Santhony.gutierrez@amd.com * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 2711308Santhony.gutierrez@amd.com * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 2811308Santhony.gutierrez@amd.com * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 2911308Santhony.gutierrez@amd.com * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 3011308Santhony.gutierrez@amd.com * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 3111308Santhony.gutierrez@amd.com * POSSIBILITY OF SUCH DAMAGE. 3211308Santhony.gutierrez@amd.com * 3311308Santhony.gutierrez@amd.com * Author: John Kalamatianos, Sooraj Puthoor 3411308Santhony.gutierrez@amd.com */ 3511308Santhony.gutierrez@amd.com 3611308Santhony.gutierrez@amd.com#ifndef __GLOBAL_MEMORY_PIPELINE_HH__ 3711308Santhony.gutierrez@amd.com#define __GLOBAL_MEMORY_PIPELINE_HH__ 3811308Santhony.gutierrez@amd.com 3911308Santhony.gutierrez@amd.com#include <queue> 4011308Santhony.gutierrez@amd.com#include <string> 4111308Santhony.gutierrez@amd.com 4211308Santhony.gutierrez@amd.com#include "gpu-compute/misc.hh" 4311308Santhony.gutierrez@amd.com#include "params/ComputeUnit.hh" 4411308Santhony.gutierrez@amd.com#include "sim/stats.hh" 4511308Santhony.gutierrez@amd.com 4611308Santhony.gutierrez@amd.com/* 4711308Santhony.gutierrez@amd.com * @file global_memory_pipeline.hh 4811308Santhony.gutierrez@amd.com * 4911308Santhony.gutierrez@amd.com * The global memory pipeline issues newly created global memory packets 5011308Santhony.gutierrez@amd.com * from the pipeline to DTLB. The exec() method of the memory packet issues 5111308Santhony.gutierrez@amd.com * the packet to the DTLB if there is space available in the return fifo. 5211308Santhony.gutierrez@amd.com * This stage also retires previously issued loads and stores that have 5311308Santhony.gutierrez@amd.com * returned from the memory sub-system. 5411308Santhony.gutierrez@amd.com */ 5511308Santhony.gutierrez@amd.com 5611308Santhony.gutierrez@amd.comclass ComputeUnit; 5711308Santhony.gutierrez@amd.com 5811308Santhony.gutierrez@amd.comclass GlobalMemPipeline 5911308Santhony.gutierrez@amd.com{ 6011308Santhony.gutierrez@amd.com public: 6111308Santhony.gutierrez@amd.com GlobalMemPipeline(const ComputeUnitParams *params); 6211308Santhony.gutierrez@amd.com void init(ComputeUnit *cu); 6311308Santhony.gutierrez@amd.com void exec(); 6411308Santhony.gutierrez@amd.com 6511308Santhony.gutierrez@amd.com template<typename c0, typename c1> void doGmReturn(GPUDynInstPtr m); 6611308Santhony.gutierrez@amd.com 6711308Santhony.gutierrez@amd.com std::queue<GPUDynInstPtr> &getGMReqFIFO() { return gmIssuedRequests; } 6811308Santhony.gutierrez@amd.com std::queue<GPUDynInstPtr> &getGMStRespFIFO() { return gmReturnedStores; } 6911308Santhony.gutierrez@amd.com std::queue<GPUDynInstPtr> &getGMLdRespFIFO() { return gmReturnedLoads; } 7011308Santhony.gutierrez@amd.com 7111308Santhony.gutierrez@amd.com bool 7211308Santhony.gutierrez@amd.com isGMLdRespFIFOWrRdy() const 7311308Santhony.gutierrez@amd.com { 7411308Santhony.gutierrez@amd.com return gmReturnedLoads.size() < gmQueueSize; 7511308Santhony.gutierrez@amd.com } 7611308Santhony.gutierrez@amd.com 7711308Santhony.gutierrez@amd.com bool 7811308Santhony.gutierrez@amd.com isGMStRespFIFOWrRdy() const 7911308Santhony.gutierrez@amd.com { 8011308Santhony.gutierrez@amd.com return gmReturnedStores.size() < gmQueueSize; 8111308Santhony.gutierrez@amd.com } 8211308Santhony.gutierrez@amd.com 8311308Santhony.gutierrez@amd.com bool 8411308Santhony.gutierrez@amd.com isGMReqFIFOWrRdy(uint32_t pendReqs=0) const 8511308Santhony.gutierrez@amd.com { 8611308Santhony.gutierrez@amd.com return (gmIssuedRequests.size() + pendReqs) < gmQueueSize; 8711308Santhony.gutierrez@amd.com } 8811308Santhony.gutierrez@amd.com 8911308Santhony.gutierrez@amd.com const std::string &name() const { return _name; } 9011308Santhony.gutierrez@amd.com void regStats(); 9111308Santhony.gutierrez@amd.com 9211308Santhony.gutierrez@amd.com private: 9311308Santhony.gutierrez@amd.com ComputeUnit *computeUnit; 9411308Santhony.gutierrez@amd.com std::string _name; 9511308Santhony.gutierrez@amd.com int gmQueueSize; 9611308Santhony.gutierrez@amd.com 9711308Santhony.gutierrez@amd.com // number of cycles of delaying the update of a VGPR that is the 9811308Santhony.gutierrez@amd.com // target of a load instruction (or the load component of an atomic) 9911308Santhony.gutierrez@amd.com // The delay is due to VRF bank conflicts 10011308Santhony.gutierrez@amd.com Stats::Scalar loadVrfBankConflictCycles; 10111308Santhony.gutierrez@amd.com // Counters to track the inflight loads and stores 10211308Santhony.gutierrez@amd.com // so that we can provide the proper backpressure 10311308Santhony.gutierrez@amd.com // on the number of inflight memory operations. 10411308Santhony.gutierrez@amd.com int inflightStores; 10511308Santhony.gutierrez@amd.com int inflightLoads; 10611308Santhony.gutierrez@amd.com 10711308Santhony.gutierrez@amd.com // The size of global memory. 10811308Santhony.gutierrez@amd.com int globalMemSize; 10911308Santhony.gutierrez@amd.com 11011308Santhony.gutierrez@amd.com // Global Memory Request FIFO: all global memory requests 11111308Santhony.gutierrez@amd.com // are issued to this FIFO from the memory pipelines 11211308Santhony.gutierrez@amd.com std::queue<GPUDynInstPtr> gmIssuedRequests; 11311308Santhony.gutierrez@amd.com 11411308Santhony.gutierrez@amd.com // Globa Store Response FIFO: all responses of global memory 11511308Santhony.gutierrez@amd.com // stores are sent to this FIFO from TCP 11611308Santhony.gutierrez@amd.com std::queue<GPUDynInstPtr> gmReturnedStores; 11711308Santhony.gutierrez@amd.com 11811308Santhony.gutierrez@amd.com // Global Load Response FIFO: all responses of global memory 11911308Santhony.gutierrez@amd.com // loads are sent to this FIFO from TCP 12011308Santhony.gutierrez@amd.com std::queue<GPUDynInstPtr> gmReturnedLoads; 12111308Santhony.gutierrez@amd.com}; 12211308Santhony.gutierrez@amd.com 12311308Santhony.gutierrez@amd.com#endif // __GLOBAL_MEMORY_PIPELINE_HH__ 124