local_memory_pipeline.hh

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/*
 * Copyright (c) 2014-2015 Advanced Micro Devices, Inc.
 * All rights reserved.
 *
 * For use for simulation and test purposes only
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 * modification, are permitted provided that the following conditions are met:
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 * this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
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#ifndef __LOCAL_MEMORY_PIPELINE_HH__
#define __LOCAL_MEMORY_PIPELINE_HH__
 
#include <queue>
#include <string>
 
#include "base/statistics.hh"
#include "base/stats/group.hh"
#include "gpu-compute/misc.hh"
#include "params/ComputeUnit.hh"
 
/*
 * @file local_memory_pipeline.hh
 *
 * The local memory pipeline issues newly created local memory packets
 * from pipeline to the LDS. This stage also retires previously issued
 * loads and stores that have returned from the LDS.
 */
 
class ComputeUnit;
class Wavefront;
 
class LocalMemPipeline
{
  public:
    LocalMemPipeline(const ComputeUnitParams &p, ComputeUnit &cu);
    void exec();
    std::queue<GPUDynInstPtr> &getLMRespFIFO() { return lmReturnedRequests; }
 
    void issueRequest(GPUDynInstPtr gpuDynInst);
 
 
    bool
    isLMRespFIFOWrRdy() const
    {
        return lmReturnedRequests.size() < lmQueueSize;
    }
 
    bool
    isLMReqFIFOWrRdy(uint32_t pendReqs=0) const
    {
        return (lmIssuedRequests.size() + pendReqs) < lmQueueSize;
    }
 
    const std::string& name() const { return _name; }
 
    void
    incLoadVRFBankConflictCycles(int num_cycles)
    {
        stats.loadVrfBankConflictCycles += num_cycles;
    }
 
  private:
    ComputeUnit &computeUnit;
    const std::string _name;
    int lmQueueSize;
 
    // Local Memory Request Fifo: all shared memory requests
    // are issued to this FIFO from the memory pipelines
    std::queue<GPUDynInstPtr> lmIssuedRequests;
 
    // Local Memory Response Fifo: all responses of shared memory
    // requests are sent to this FIFO from LDS
    std::queue<GPUDynInstPtr> lmReturnedRequests;
 
  protected:
    struct LocalMemPipelineStats : public Stats::Group
    {
        LocalMemPipelineStats(Stats::Group *parent);
 
        Stats::Scalar loadVrfBankConflictCycles;
    } stats;
};
 
#endif // __LOCAL_MEMORY_PIPELINE_HH__