1/*
2 * Copyright (c) 2014-2017 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 *          Brad Beckmann,
35 *          Sooraj Puthoor
36 */
37
38#ifndef __FETCH_UNIT_HH__
39#define __FETCH_UNIT_HH__
40
41#include <string>
42#include <utility>
43#include <vector>
44
45#include "arch/gpu_decoder.hh"
46#include "base/statistics.hh"
47#include "config/the_gpu_isa.hh"
48#include "gpu-compute/scheduler.hh"
49#include "mem/packet.hh"
50
51class ComputeUnit;
52class Wavefront;
53
54class FetchUnit
55{
56  public:
57    FetchUnit(const ComputeUnitParams* params);
58    ~FetchUnit();
59    void init(ComputeUnit *cu);
60    void exec();
61    void bindWaveList(std::vector<Wavefront*> *list);
62    void initiateFetch(Wavefront *wavefront);
63    void fetch(PacketPtr pkt, Wavefront *wavefront);
64    void processFetchReturn(PacketPtr pkt);
65    static uint32_t globalFetchUnitID;
66
67  private:
68    bool timingSim;
69    ComputeUnit *computeUnit;
70    TheGpuISA::Decoder decoder;
71
72    // Fetch scheduler; Selects one wave from
73    // the fetch queue for instruction fetching.
74    // The selection is made according to
75    // a scheduling policy
76    Scheduler fetchScheduler;
77
78    // Stores the list of waves that are
79    // ready to be fetched this cycle
80    std::vector<Wavefront*> fetchQueue;
81
82    // Stores the fetch status of all waves dispatched to this SIMD.
83    // TRUE implies the wave is ready to fetch and is already
84    // moved to fetchQueue
85    std::vector<std::pair<Wavefront*, bool>> fetchStatusQueue;
86
87    // Pointer to list of waves dispatched on to this SIMD unit
88    std::vector<Wavefront*> *waveList;
89};
90
91#endif // __FETCH_UNIT_HH__
92