1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 #include <sys/types.h>
19 #include <tuple>
20 #include <unistd.h>
21 #include <memory>
22 #include <drm/msm_drm.h>
23 #include <drm/msm_drm_pp.h>
24 #include <xf86drm.h>
25 #include <xf86drmMode.h>
26 #include <array>
27 #include <deque>
28 #include <mutex>
29 #include <utils/Timers.h>
30 
31 namespace histogram {
32 
33 struct TimeKeeper {
34     virtual nsecs_t current_time() const = 0;
35     virtual ~TimeKeeper() = default;
36 protected:
37     TimeKeeper() = default;
38     TimeKeeper& operator=(TimeKeeper const&) = delete;
39     TimeKeeper(TimeKeeper const&) = delete;
40 };
41 
42 struct DefaultTimeKeeper final : TimeKeeper
43 {
44     nsecs_t current_time() const final;
45 };
46 
47 class Ringbuffer
48 {
49 public:
50     static std::unique_ptr<Ringbuffer> create(size_t ringbuffer_size, std::unique_ptr<TimeKeeper> tk);
51     void insert(drm_msm_hist const& frame);
52     bool resize(size_t ringbuffer_size);
53 
54     using Sample = std::tuple<uint64_t /* numFrames */, std::array<uint64_t, HIST_V_SIZE> /* bins */>;
55     Sample collect_cumulative() const;
56     Sample collect_ringbuffer_all() const;
57     Sample collect_after(nsecs_t timestamp) const;
58     Sample collect_max(uint32_t max_frames) const;
59     Sample collect_max_after(nsecs_t timestamp, uint32_t max_frames) const;
60     ~Ringbuffer() = default;
61 
62 private:
63     Ringbuffer(size_t ringbuffer_size, std::unique_ptr<TimeKeeper> tk);
64     Ringbuffer(Ringbuffer const&) = delete;
65     Ringbuffer& operator=(Ringbuffer const&) = delete;
66 
67     Sample collect_max(uint32_t max_frames, std::unique_lock<std::mutex> const&) const;
68     Sample collect_max_after(nsecs_t timestamp, uint32_t max_frames, std::unique_lock<std::mutex> const&) const;
69     void update_cumulative(nsecs_t now, uint64_t& count, std::array<uint64_t, HIST_V_SIZE>& bins) const;
70 
71     std::mutex mutable mutex;
72     struct HistogramEntry {
73         drm_msm_hist histogram;
74         nsecs_t start_timestamp;
75         nsecs_t end_timestamp;
76     };
77     std::deque<HistogramEntry> ringbuffer;
78     size_t rb_max_size;
79     std::unique_ptr<TimeKeeper> const timekeeper;
80 
81     uint64_t cumulative_frame_count;
82     std::array<uint64_t, HIST_V_SIZE> cumulative_bins;
83 };
84 
85 }
86