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