src/gpu-compute/local_memory_pipeline.hh

   1 /*
   2  * Copyright (c) 2014-2015 Advanced Micro Devices, Inc.
   3  * All rights reserved.
   4  *
   5  * For use for simulation and test purposes only
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright notice,
  11  * this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright notice,
  14  * this list of conditions and the following disclaimer in the documentation
  15  * and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the copyright holder nor the names of its
  18  * contributors may be used to endorse or promote products derived from this
  19  * software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef __LOCAL_MEMORY_PIPELINE_HH__
  35 #define __LOCAL_MEMORY_PIPELINE_HH__
  36
  37 #include <queue>
  38 #include <string>
  39
  40 #include "gpu-compute/misc.hh"
  41 #include "params/ComputeUnit.hh"
  42 #include "sim/stats.hh"
  43
  44 /*
  45  * @file local_memory_pipeline.hh
  46  *
  47  * The local memory pipeline issues newly created local memory packets
  48  * from pipeline to the LDS. This stage also retires previously issued
  49  * loads and stores that have returned from the LDS.
  50  */
  51
  52 class ComputeUnit;
  53 class Wavefront;
  54
  55 class LocalMemPipeline
  56 {
  57   public:
  58     LocalMemPipeline(const ComputeUnitParams *params);
  59     void init(ComputeUnit *cu);
  60     void exec();
  61     std::queue<GPUDynInstPtr> &getLMRespFIFO() { return lmReturnedRequests; }
  62
  63     void issueRequest(GPUDynInstPtr gpuDynInst);
  64
  65
  66     bool
  67     isLMRespFIFOWrRdy() const
  68     {
  69         return lmReturnedRequests.size() < lmQueueSize;
  70     }
  71
  72     bool
  73     isLMReqFIFOWrRdy(uint32_t pendReqs=0) const
  74     {
  75         return (lmIssuedRequests.size() + pendReqs) < lmQueueSize;
  76     }
  77
  78     const std::string& name() const { return _name; }
  79     void regStats();
  80
  81     void
  82     incLoadVRFBankConflictCycles(int num_cycles)
  83     {
  84         loadVrfBankConflictCycles += num_cycles;
  85     }
  86
  87   private:
  88     ComputeUnit *computeUnit;
  89     std::string _name;
  90     int lmQueueSize;
  91     Stats::Scalar loadVrfBankConflictCycles;
  92     // Local Memory Request Fifo: all shared memory requests
  93     // are issued to this FIFO from the memory pipelines
  94     std::queue<GPUDynInstPtr> lmIssuedRequests;
  95
  96     // Local Memory Response Fifo: all responses of shared memory
  97     // requests are sent to this FIFO from LDS
  98     std::queue<GPUDynInstPtr> lmReturnedRequests;
  99 };
 100
 101 #endif // __LOCAL_MEMORY_PIPELINE_HH__