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 #include <pthread.h>
18 #include <chrono>
19 #include <ctime>
20 #include <iomanip>
21 #include <fcntl.h>
22 #include <fstream>
23 #include <log/log.h>
24 #include <memory>
25 #include <sstream>
26 #include <sys/epoll.h>
27 #include <sys/prctl.h>
28 #include <sys/stat.h>
29 #include <sys/types.h>
30 #include <tuple>
31 #include <unistd.h>
32 #include <unordered_map>
33 #include <vector>
34
35 #include <drm/msm_drm.h>
36 #include <drm/msm_drm_pp.h>
37 #include <xf86drm.h>
38 #include <xf86drmMode.h>
39
40 #include "histogram_collector.h"
41 #include "ringbuffer.h"
42
43 constexpr static auto implementation_defined_max_frame_ringbuffer = 300;
44
HistogramCollector()45 histogram::HistogramCollector::HistogramCollector() :
46 histogram(histogram::Ringbuffer::create(
47 implementation_defined_max_frame_ringbuffer, std::make_unique<histogram::DefaultTimeKeeper>())) {
48 }
49
~HistogramCollector()50 histogram::HistogramCollector::~HistogramCollector() {
51 stop();
52 }
53
54 namespace {
55 static constexpr size_t numBuckets = 8;
56 static_assert((HIST_V_SIZE % numBuckets) == 0,
57 "histogram cannot be rebucketed to smaller number of buckets");
58 static constexpr int bucket_compression = HIST_V_SIZE / numBuckets;
59
rebucketTo8Buckets(std::array<uint64_t,HIST_V_SIZE> const & frame)60 std::array<uint64_t, numBuckets> rebucketTo8Buckets(std::array<uint64_t, HIST_V_SIZE> const& frame) {
61 std::array<uint64_t, numBuckets> bins;
62 bins.fill(0);
63 for (auto i = 0u; i < HIST_V_SIZE; i++)
64 bins[i / bucket_compression] += frame[i];
65 return bins;
66 }
67 }
68
Dump() const69 std::string histogram::HistogramCollector::Dump() const {
70 uint64_t num_frames;
71 std::array<uint64_t, HIST_V_SIZE> all_sample_buckets;
72 std::tie(num_frames, all_sample_buckets) = histogram->collect_cumulative();
73 std::array<uint64_t, numBuckets> samples = rebucketTo8Buckets(all_sample_buckets);
74
75 std::stringstream ss;
76 ss << "Color Sampling, dark (0.0) to light (1.0): sampled frames: " << num_frames << '\n';
77 if (num_frames == 0) {
78 ss << "\tno color statistics collected\n";
79 return ss.str();
80 }
81
82 ss << std::fixed << std::setprecision(3);
83 ss << "\tbucket\t\t: # of displayed pixels at bucket value\n";
84 for (auto i = 0u; i < samples.size(); i++) {
85 ss << "\t" << i / static_cast<float>(samples.size()) <<
86 " to " << ( i + 1 ) / static_cast<float>(samples.size()) << "\t: " <<
87 samples[i] << '\n';
88 }
89
90 return ss.str();
91 }
92
collect(uint64_t max_frames,uint64_t timestamp,int32_t out_samples_size[NUM_HISTOGRAM_COLOR_COMPONENTS],uint64_t * out_samples[NUM_HISTOGRAM_COLOR_COMPONENTS],uint64_t * out_num_frames) const93 HWC2::Error histogram::HistogramCollector::collect(
94 uint64_t max_frames,
95 uint64_t timestamp,
96 int32_t out_samples_size[NUM_HISTOGRAM_COLOR_COMPONENTS],
97 uint64_t* out_samples[NUM_HISTOGRAM_COLOR_COMPONENTS],
98 uint64_t* out_num_frames) const {
99
100 if (!out_samples_size || !out_num_frames)
101 return HWC2::Error::BadParameter;
102
103 out_samples_size[0] = 0;
104 out_samples_size[1] = 0;
105 out_samples_size[2] = numBuckets;
106 out_samples_size[3] = 0;
107
108 uint64_t num_frames;
109 std::array<uint64_t, HIST_V_SIZE> samples;
110
111 if (max_frames == 0 && timestamp == 0) {
112 std::tie(num_frames, samples) = histogram->collect_cumulative();
113 } else if (max_frames == 0) {
114 std::tie(num_frames, samples) = histogram->collect_after(timestamp);
115 } else if (timestamp == 0) {
116 std::tie(num_frames, samples) = histogram->collect_max(max_frames);
117 } else {
118 std::tie(num_frames, samples) = histogram->collect_max_after(timestamp, max_frames);
119 }
120
121 auto samples_rebucketed = rebucketTo8Buckets(samples);
122 *out_num_frames = num_frames;
123 if (out_samples && out_samples[2])
124 memcpy(out_samples[2], samples_rebucketed.data(), sizeof(uint64_t) * samples_rebucketed.size());
125
126 return HWC2::Error::None;
127 }
128
getAttributes(int32_t * format,int32_t * dataspace,uint8_t * supported_components) const129 HWC2::Error histogram::HistogramCollector::getAttributes(int32_t* format,
130 int32_t* dataspace,
131 uint8_t* supported_components) const {
132 if (!format || !dataspace || !supported_components)
133 return HWC2::Error::BadParameter;
134
135 *format = HAL_PIXEL_FORMAT_HSV_888;
136 *dataspace = HAL_DATASPACE_UNKNOWN;
137 *supported_components = HWC2_FORMAT_COMPONENT_2;
138 return HWC2::Error::None;
139 }
140
start()141 void histogram::HistogramCollector::start() {
142 start(implementation_defined_max_frame_ringbuffer);
143 }
144
start(uint64_t max_frames)145 void histogram::HistogramCollector::start(uint64_t max_frames) {
146 std::unique_lock<decltype(mutex)> lk(mutex);
147 if (started) {
148 return;
149 }
150
151 started = true;
152 histogram = histogram::Ringbuffer::create(max_frames, std::make_unique<histogram::DefaultTimeKeeper>());
153 monitoring_thread = std::thread(&HistogramCollector::blob_processing_thread, this);
154 }
155
stop()156 void histogram::HistogramCollector::stop() {
157 std::unique_lock<decltype(mutex)> lk(mutex);
158 if (!started) {
159 return;
160 }
161
162 started = false;
163 cv.notify_all();
164 lk.unlock();
165
166 if (monitoring_thread.joinable())
167 monitoring_thread.join();
168 }
169
notify_histogram_event(int blob_source_fd,BlobId id)170 void histogram::HistogramCollector::notify_histogram_event(int blob_source_fd, BlobId id) {
171 std::unique_lock<decltype(mutex)> lk(mutex);
172 if (!started) {
173 ALOGW("Discarding event blob-id: %X", id);
174 return;
175 }
176 if (work_available) {
177 ALOGI("notified of histogram event before consuming last one. prior event discarded");
178 }
179
180 work_available = true;
181 blobwork = HistogramCollector::BlobWork{blob_source_fd, id};
182 cv.notify_all();
183 }
184
blob_processing_thread()185 void histogram::HistogramCollector::blob_processing_thread() {
186 pthread_setname_np(pthread_self(), "histogram_blob");
187
188 std::unique_lock<decltype(mutex)> lk(mutex);
189
190 while (true) {
191 cv.wait(lk, [this] { return !started || work_available; });
192 if (!started) {
193 return;
194 }
195
196 auto work = blobwork;
197 work_available = false;
198 lk.unlock();
199
200 drmModePropertyBlobPtr blob = drmModeGetPropertyBlob(work.fd, work.id);
201 if (!blob) {
202 lk.lock();
203 continue;
204 }
205 histogram->insert(*static_cast<struct drm_msm_hist*>(blob->data));
206 drmModeFreePropertyBlob(blob);
207
208 lk.lock();
209 }
210 }
211