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 #define LOG_TAG "android.hardware.power@1.3-service.pixel-libperfmgr"
18 #define ATRACE_TAG (ATRACE_TAG_POWER | ATRACE_TAG_HAL)
19
20 #include <fcntl.h>
21 #include <poll.h>
22 #include <sys/eventfd.h>
23 #include <time.h>
24 #include <unistd.h>
25 #include <utils/Log.h>
26 #include <utils/Trace.h>
27 #include <memory>
28
29 #include "InteractionHandler.h"
30
31 #define MAX_LENGTH 64
32
33 #define MSINSEC 1000L
34 #define USINMS 1000000L
35
36 static const std::vector<std::string> fb_idle_patch = {"/sys/class/drm/card0/device/idle_state",
37 "/sys/class/graphics/fb0/idle_state"};
38
InteractionHandler(std::shared_ptr<HintManager> const & hint_manager)39 InteractionHandler::InteractionHandler(std::shared_ptr<HintManager> const &hint_manager)
40 : mState(INTERACTION_STATE_UNINITIALIZED),
41 mWaitMs(100),
42 mMinDurationMs(1400),
43 mMaxDurationMs(5650),
44 mDurationMs(0),
45 mHintManager(hint_manager) {}
46
~InteractionHandler()47 InteractionHandler::~InteractionHandler() {
48 Exit();
49 }
50
fb_idle_open(void)51 static int fb_idle_open(void) {
52 int fd;
53 for (auto &path : fb_idle_patch) {
54 fd = open(path.c_str(), O_RDONLY);
55 if (fd >= 0)
56 return fd;
57 }
58 ALOGE("Unable to open fb idle state path (%d)", errno);
59 return -1;
60 }
61
Init()62 bool InteractionHandler::Init() {
63 std::lock_guard<std::mutex> lk(mLock);
64
65 if (mState != INTERACTION_STATE_UNINITIALIZED)
66 return true;
67
68 int fd = fb_idle_open();
69 if (fd < 0)
70 return false;
71 mIdleFd = fd;
72
73 mEventFd = eventfd(0, EFD_NONBLOCK);
74 if (mEventFd < 0) {
75 ALOGE("Unable to create event fd (%d)", errno);
76 close(mIdleFd);
77 return false;
78 }
79
80 mState = INTERACTION_STATE_IDLE;
81 mThread = std::unique_ptr<std::thread>(new std::thread(&InteractionHandler::Routine, this));
82
83 return true;
84 }
85
Exit()86 void InteractionHandler::Exit() {
87 std::unique_lock<std::mutex> lk(mLock);
88 if (mState == INTERACTION_STATE_UNINITIALIZED)
89 return;
90
91 AbortWaitLocked();
92 mState = INTERACTION_STATE_UNINITIALIZED;
93 lk.unlock();
94
95 mCond.notify_all();
96 mThread->join();
97
98 close(mEventFd);
99 close(mIdleFd);
100 }
101
PerfLock()102 void InteractionHandler::PerfLock() {
103 ALOGV("%s: acquiring perf lock", __func__);
104 if (!mHintManager->DoHint("INTERACTION")) {
105 ALOGE("%s: do hint INTERACTION failed", __func__);
106 }
107 ATRACE_INT("interaction_lock", 1);
108 }
109
PerfRel()110 void InteractionHandler::PerfRel() {
111 ALOGV("%s: releasing perf lock", __func__);
112 if (!mHintManager->EndHint("INTERACTION")) {
113 ALOGE("%s: end hint INTERACTION failed", __func__);
114 }
115 ATRACE_INT("interaction_lock", 0);
116 }
117
CalcTimespecDiffMs(struct timespec start,struct timespec end)118 size_t InteractionHandler::CalcTimespecDiffMs(struct timespec start, struct timespec end) {
119 size_t diff_in_us = 0;
120 diff_in_us += (end.tv_sec - start.tv_sec) * MSINSEC;
121 diff_in_us += (end.tv_nsec - start.tv_nsec) / USINMS;
122 return diff_in_us;
123 }
124
Acquire(int32_t duration)125 void InteractionHandler::Acquire(int32_t duration) {
126 ATRACE_CALL();
127
128 std::lock_guard<std::mutex> lk(mLock);
129 if (mState == INTERACTION_STATE_UNINITIALIZED) {
130 ALOGW("%s: called while uninitialized", __func__);
131 return;
132 }
133
134 int inputDuration = duration + 650;
135 int finalDuration;
136 if (inputDuration > mMaxDurationMs)
137 finalDuration = mMaxDurationMs;
138 else if (inputDuration > mMinDurationMs)
139 finalDuration = inputDuration;
140 else
141 finalDuration = mMinDurationMs;
142
143 struct timespec cur_timespec;
144 clock_gettime(CLOCK_MONOTONIC, &cur_timespec);
145 if (mState != INTERACTION_STATE_IDLE && finalDuration <= mDurationMs) {
146 size_t elapsed_time = CalcTimespecDiffMs(mLastTimespec, cur_timespec);
147 // don't hint if previous hint's duration covers this hint's duration
148 if (elapsed_time <= (mDurationMs - finalDuration)) {
149 ALOGV("%s: Previous duration (%d) cover this (%d) elapsed: %lld", __func__,
150 static_cast<int>(mDurationMs), static_cast<int>(finalDuration),
151 static_cast<long long>(elapsed_time));
152 return;
153 }
154 }
155 mLastTimespec = cur_timespec;
156 mDurationMs = finalDuration;
157
158 ALOGV("%s: input: %d final duration: %d", __func__, duration, finalDuration);
159
160 if (mState == INTERACTION_STATE_WAITING)
161 AbortWaitLocked();
162 else if (mState == INTERACTION_STATE_IDLE)
163 PerfLock();
164
165 mState = INTERACTION_STATE_INTERACTION;
166 mCond.notify_one();
167 }
168
Release()169 void InteractionHandler::Release() {
170 std::lock_guard<std::mutex> lk(mLock);
171 if (mState == INTERACTION_STATE_WAITING) {
172 ATRACE_CALL();
173 PerfRel();
174 mState = INTERACTION_STATE_IDLE;
175 } else {
176 // clear any wait aborts pending in event fd
177 uint64_t val;
178 ssize_t ret = read(mEventFd, &val, sizeof(val));
179
180 ALOGW_IF(ret < 0, "%s: failed to clear eventfd (%zd, %d)", __func__, ret, errno);
181 }
182 }
183
184 // should be called while locked
AbortWaitLocked()185 void InteractionHandler::AbortWaitLocked() {
186 uint64_t val = 1;
187 ssize_t ret = write(mEventFd, &val, sizeof(val));
188 if (ret != sizeof(val))
189 ALOGW("Unable to write to event fd (%zd)", ret);
190 }
191
WaitForIdle(int32_t wait_ms,int32_t timeout_ms)192 void InteractionHandler::WaitForIdle(int32_t wait_ms, int32_t timeout_ms) {
193 char data[MAX_LENGTH];
194 ssize_t ret;
195 struct pollfd pfd[2];
196
197 ATRACE_CALL();
198
199 ALOGV("%s: wait:%d timeout:%d", __func__, wait_ms, timeout_ms);
200
201 pfd[0].fd = mEventFd;
202 pfd[0].events = POLLIN;
203 pfd[1].fd = mIdleFd;
204 pfd[1].events = POLLPRI | POLLERR;
205
206 ret = poll(pfd, 1, wait_ms);
207 if (ret > 0) {
208 ALOGV("%s: wait aborted", __func__);
209 return;
210 } else if (ret < 0) {
211 ALOGE("%s: error in poll while waiting", __func__);
212 return;
213 }
214
215 ret = pread(mIdleFd, data, sizeof(data), 0);
216 if (!ret) {
217 ALOGE("%s: Unexpected EOF!", __func__);
218 return;
219 }
220
221 if (!strncmp(data, "idle", 4)) {
222 ALOGV("%s: already idle", __func__);
223 return;
224 }
225
226 ret = poll(pfd, 2, timeout_ms);
227 if (ret < 0)
228 ALOGE("%s: Error on waiting for idle (%zd)", __func__, ret);
229 else if (ret == 0)
230 ALOGV("%s: timed out waiting for idle", __func__);
231 else if (pfd[0].revents)
232 ALOGV("%s: wait for idle aborted", __func__);
233 else if (pfd[1].revents)
234 ALOGV("%s: idle detected", __func__);
235 }
236
Routine()237 void InteractionHandler::Routine() {
238 std::unique_lock<std::mutex> lk(mLock, std::defer_lock);
239
240 while (true) {
241 lk.lock();
242 mCond.wait(lk, [&] { return mState != INTERACTION_STATE_IDLE; });
243 if (mState == INTERACTION_STATE_UNINITIALIZED)
244 return;
245 mState = INTERACTION_STATE_WAITING;
246 lk.unlock();
247
248 WaitForIdle(mWaitMs, mDurationMs);
249 Release();
250 }
251 }
252