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  * Authors: Anthony Gutierrez,
  34  *          Sooraj Puthoor
  35  */
  36
  37 #include "gpu-compute/fetch_stage.hh"
  38
  39 #include "gpu-compute/compute_unit.hh"
  40 #include "gpu-compute/wavefront.hh"
  41
  42 FetchStage::FetchStage(const ComputeUnitParams* p) : numSIMDs(p->num_SIMDs),
  43     computeUnit(nullptr)
  44 {
  45     for (int j = 0; j < numSIMDs; ++j) {
  46         FetchUnit newFetchUnit(p);
  47         fetchUnit.push_back(newFetchUnit);
  48     }
  49 }
  50
  51 FetchStage::~FetchStage()
  52 {
  53     fetchUnit.clear();
  54 }
  55
  56 void
  57 FetchStage::init(ComputeUnit *cu)
  58 {
  59     computeUnit = cu;
  60     _name = computeUnit->name() + ".FetchStage";
  61
  62     for (int j = 0; j < numSIMDs; ++j) {
  63         fetchUnit[j].bindWaveList(&computeUnit->wfList[j]);
  64         fetchUnit[j].init(computeUnit);
  65     }
  66 }
  67
  68 void
  69 FetchStage::exec()
  70 {
  71     for (int j = 0; j < numSIMDs; ++j) {
  72         fetchUnit[j].exec();
  73     }
  74 }
  75
  76 void
  77 FetchStage::processFetchReturn(PacketPtr pkt)
  78 {
  79     ComputeUnit::SQCPort::SenderState *sender_state =
  80         safe_cast<ComputeUnit::SQCPort::SenderState*>(pkt->senderState);
  81
  82     Wavefront *wavefront = sender_state->wavefront;
  83
  84     const unsigned num_instructions = pkt->req->getSize() /
  85         sizeof(TheGpuISA::RawMachInst);
  86
  87     instFetchInstReturned.sample(num_instructions);
  88     uint32_t simdId = wavefront->simdId;
  89     fetchUnit[simdId].processFetchReturn(pkt);
  90 }
  91
  92 void
  93 FetchStage::fetch(PacketPtr pkt, Wavefront *wavefront)
  94 {
  95     fetchUnit[wavefront->simdId].fetch(pkt, wavefront);
  96 }
  97
  98 void
  99 FetchStage::regStats()
 100 {
 101     instFetchInstReturned
 102         .init(1, 32, 1)
 103         .name(name() + ".inst_fetch_instr_returned")
 104         .desc("For each instruction fetch request recieved record how many "
 105               "instructions you got from it")
 106         ;
 107 }