src/gpu-compute/scoreboard_check_stage.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 __SCOREBOARD_CHECK_STAGE_HH__
  35 #define __SCOREBOARD_CHECK_STAGE_HH__
  36
  37 #include <cstdint>
  38 #include <string>
  39 #include <unordered_map>
  40 #include <utility>
  41 #include <vector>
  42
  43 #include "sim/stats.hh"
  44
  45 class ComputeUnit;
  46 class ScoreboardCheckToSchedule;
  47 class Wavefront;
  48
  49 struct ComputeUnitParams;
  50
  51 /*
  52  * Scoreboard check stage.
  53  * All wavefronts are analyzed to see if they are ready
  54  * to be executed this cycle. Both structural and data
  55  * hazards are considered while marking a wave "ready"
  56  * for execution. After analysis, the ready waves are
  57  * added to readyList.
  58  */
  59 class ScoreboardCheckStage
  60 {
  61   public:
  62     enum nonrdytype_e {
  63         NRDY_ILLEGAL,
  64         NRDY_WF_STOP,
  65         NRDY_IB_EMPTY,
  66         NRDY_WAIT_CNT,
  67         NRDY_BARRIER_WAIT,
  68         NRDY_VGPR_NRDY,
  69         NRDY_SGPR_NRDY,
  70         INST_RDY,
  71         NRDY_CONDITIONS
  72     };
  73
  74     ScoreboardCheckStage(const ComputeUnitParams* p, ComputeUnit &cu,
  75                          ScoreboardCheckToSchedule &to_schedule);
  76     ~ScoreboardCheckStage();
  77     void exec();
  78
  79     // Stats related variables and methods
  80     const std::string& name() const { return _name; }
  81     void regStats();
  82
  83   private:
  84     void collectStatistics(nonrdytype_e rdyStatus);
  85     int mapWaveToExeUnit(Wavefront *w);
  86     bool ready(Wavefront *w, nonrdytype_e *rdyStatus,
  87                int *exeResType, int wfSlot);
  88     ComputeUnit &computeUnit;
  89
  90     /**
  91      * Interface between scoreboard check and schedule stages. Each
  92      * cycle the scoreboard check stage populates this interface with
  93      * information needed by the schedule stage.
  94      */
  95     ScoreboardCheckToSchedule &toSchedule;
  96
  97     // Stats
  98     Stats::Vector stallCycles;
  99
 100     const std::string _name;
 101 };
 102
 103 #endif // __SCOREBOARD_CHECK_STAGE_HH__