src/gpu-compute/fetch_stage.cc

   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 #include "gpu-compute/fetch_stage.hh"
  35
  36 #include "gpu-compute/compute_unit.hh"
  37 #include "gpu-compute/wavefront.hh"
  38
  39 FetchStage::FetchStage(const ComputeUnitParams* p) :
  40     numVectorALUs(p->num_SIMDs), computeUnit(nullptr)
  41 {
  42     for (int j = 0; j < numVectorALUs; ++j) {
  43         FetchUnit newFetchUnit(p);
  44         _fetchUnit.push_back(newFetchUnit);
  45     }
  46 }
  47
  48 FetchStage::~FetchStage()
  49 {
  50     _fetchUnit.clear();
  51 }
  52
  53 void
  54 FetchStage::init(ComputeUnit *cu)
  55 {
  56     computeUnit = cu;
  57     _name = computeUnit->name() + ".FetchStage";
  58
  59     for (int j = 0; j < numVectorALUs; ++j) {
  60         _fetchUnit[j].bindWaveList(&computeUnit->wfList[j]);
  61         _fetchUnit[j].init(computeUnit);
  62     }
  63 }
  64
  65 void
  66 FetchStage::exec()
  67 {
  68     for (int j = 0; j < numVectorALUs; ++j) {
  69         _fetchUnit[j].exec();
  70     }
  71 }
  72
  73 void
  74 FetchStage::processFetchReturn(PacketPtr pkt)
  75 {
  76     ComputeUnit::SQCPort::SenderState *sender_state =
  77         safe_cast<ComputeUnit::SQCPort::SenderState*>(pkt->senderState);
  78
  79     Wavefront *wavefront = sender_state->wavefront;
  80
  81     const unsigned num_instructions = pkt->req->getSize() /
  82         sizeof(TheGpuISA::RawMachInst);
  83
  84     instFetchInstReturned.sample(num_instructions);
  85     uint32_t simdId = wavefront->simdId;
  86     _fetchUnit[simdId].processFetchReturn(pkt);
  87 }
  88
  89 void
  90 FetchStage::fetch(PacketPtr pkt, Wavefront *wavefront)
  91 {
  92     _fetchUnit[wavefront->simdId].fetch(pkt, wavefront);
  93 }
  94
  95 void
  96 FetchStage::regStats()
  97 {
  98     instFetchInstReturned
  99         .init(1, 32, 1)
 100         .name(name() + ".inst_fetch_instr_returned")
 101         .desc("For each instruction fetch request recieved record how many "
 102               "instructions you got from it")
 103         ;
 104 }