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
 *
 * 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
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 *
 * Author: Sooraj Puthoor
 */

#ifndef __LOCAL_MEMORY_PIPELINE_HH__
#define __LOCAL_MEMORY_PIPELINE_HH__

#include <queue>
#include <string>

#include "gpu-compute/misc.hh"
#include "params/ComputeUnit.hh"
#include "sim/stats.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 *params);
    void init(ComputeUnit *cu);
    void exec();

    std::queue<GPUDynInstPtr> &getLMReqFIFO() { return lmIssuedRequests; }
    std::queue<GPUDynInstPtr> &getLMRespFIFO() { return lmReturnedRequests; }

    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 regStats();

    void
    incLoadVRFBankConflictCycles(int num_cycles)
    {
        loadVrfBankConflictCycles += num_cycles;
    }

  private:
    ComputeUnit *computeUnit;
    std::string _name;
    int lmQueueSize;
    Stats::Scalar loadVrfBankConflictCycles;
    // 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;
};

#endif // __LOCAL_MEMORY_PIPELINE_HH__