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: Sooraj Puthoor,
34 *          Mark Wyse
35 */
36
37#ifndef __SCOREBOARD_CHECK_STAGE_HH__
38#define __SCOREBOARD_CHECK_STAGE_HH__
39
40#include <cstdint>
41#include <string>
42#include <utility>
43#include <vector>
44
45class ComputeUnit;
46class Wavefront;
47
48struct ComputeUnitParams;
49
50enum WAVE_STATUS
51{
52    BLOCKED = 0,
53    READY
54};
55
56/*
57 * Scoreboard check stage.
58 * All wavefronts are analyzed to see if they are ready
59 * to be executed this cycle. Both structural and data
60 * hazards are considered while marking a wave "ready"
61 * for execution. After analysis, the ready waves are
62 * added to readyList.
63 */
64class ScoreboardCheckStage
65{
66  public:
67    ScoreboardCheckStage(const ComputeUnitParams* params);
68    ~ScoreboardCheckStage();
69    void init(ComputeUnit *cu);
70    void exec();
71
72    // Stats related variables and methods
73    const std::string& name() const { return _name; }
74    void regStats();
75
76  private:
77    void collectStatistics(Wavefront *curWave, int unitId);
78    void initStatistics();
79    ComputeUnit *computeUnit;
80    uint32_t numSIMDs;
81    uint32_t numMemUnits;
82    uint32_t numShrMemPipes;
83
84    // flag per vector SIMD unit that is set when there is at least one
85    // WF that has a vector ALU instruction as the oldest in its
86    // Instruction Buffer
87    std::vector<bool> *vectorAluInstAvail;
88    int lastGlbMemSimd;
89    int lastShrMemSimd;
90
91    int *glbMemInstAvail;
92    int *shrMemInstAvail;
93    // List of waves which are ready to be scheduled.
94    // Each execution resource has a ready list
95    std::vector<std::vector<Wavefront*>*> readyList;
96
97    // Stores the status of waves. A READY implies the
98    // wave is ready to be scheduled this cycle and
99    // is already present in the readyList
100    std::vector<std::vector<std::pair<Wavefront*, WAVE_STATUS>>*>
101        waveStatusList;
102
103    std::string _name;
104};
105
106#endif // __SCOREBOARD_CHECK_STAGE_HH__
107