of_scheduling_policy.hh revision 12696:15d4edfbb01b 
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: Sooraj Puthoor,
34 *          Anthony Gutierrez
35 */
36
37#ifndef __GPU_COMPUTE_OF_SCHEDULING_POLICY_HH__
38#define __GPU_COMPUTE_OF_SCHEDULING_POLICY_HH__
39
40#include <vector>
41
42#include "gpu-compute/scheduling_policy.hh"
43#include "gpu-compute/wavefront.hh"
44
45// oldest first where age is marked by the wave id
46class OFSchedulingPolicy final : public __SchedulingPolicy<OFSchedulingPolicy>
47{
48  public:
49    OFSchedulingPolicy()
50    {
51    }
52
53    static Wavefront*
54    __chooseWave(std::vector<Wavefront*> *sched_list)
55    {
56        panic_if(!sched_list->size(), "OF scheduling policy sched list is "
57            "empty.\n");
58        // set when policy choose a wave to schedule
59        Wavefront *selected_wave(nullptr);
60        int selected_wave_id = -1;
61        int selected_position = 0;
62
63        for (int position = 0; position < sched_list->size(); ++position) {
64            Wavefront *cur_wave = sched_list->at(position);
65            int cur_wave_id = cur_wave->wfDynId;
66
67            // Choosed wave with the lowest wave ID
68            if (selected_wave_id == -1 || cur_wave_id < selected_wave_id) {
69                selected_wave_id = cur_wave_id;
70                selected_wave = cur_wave;
71                selected_position = position;
72            }
73        }
74
75        // Check to make sure ready list had at least one schedulable wave
76        panic_if(!selected_wave, "No wave found by OF scheduling policy.\n");
77        sched_list->erase(sched_list->begin() + selected_position);
78
79        return selected_wave;
80    }
81};
82
83#endif // __GPU_COMPUTE_OF_SCHEDULING_POLICY_HH__
84