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hardware_samsung/hidl/power-libperfmgr/InteractionHandler.cpp

251 lines
7.1 KiB

/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "android.hardware.power@1.3-service.samsung-libperfmgr"
#define ATRACE_TAG (ATRACE_TAG_POWER | ATRACE_TAG_HAL)
#include <fcntl.h>
#include <poll.h>
#include <sys/eventfd.h>
#include <time.h>
#include <unistd.h>
#include <utils/Log.h>
#include <utils/Trace.h>
#include <memory>
#include "InteractionHandler.h"
#define MAX_LENGTH 64
#define MSINSEC 1000L
#define USINMS 1000000L
static const std::vector<std::string> fb_idle_patch = {"/sys/class/drm/card0/device/idle_state",
"/sys/class/graphics/fb0/idle_state"};
InteractionHandler::InteractionHandler(std::shared_ptr<HintManager> const &hint_manager)
: mState(INTERACTION_STATE_UNINITIALIZED),
mWaitMs(100),
mMinDurationMs(1400),
mMaxDurationMs(5650),
mDurationMs(0),
mHintManager(hint_manager) {}
InteractionHandler::~InteractionHandler() {
Exit();
}
static int fb_idle_open(void) {
int fd;
for (auto &path : fb_idle_patch) {
fd = open(path.c_str(), O_RDONLY);
if (fd >= 0)
return fd;
}
ALOGE("Unable to open fb idle state path (%d)", errno);
return -1;
}
bool InteractionHandler::Init() {
std::lock_guard<std::mutex> lk(mLock);
if (mState != INTERACTION_STATE_UNINITIALIZED)
return true;
int fd = fb_idle_open();
if (fd < 0)
return false;
mIdleFd = fd;
mEventFd = eventfd(0, EFD_NONBLOCK);
if (mEventFd < 0) {
ALOGE("Unable to create event fd (%d)", errno);
close(mIdleFd);
return false;
}
mState = INTERACTION_STATE_IDLE;
mThread = std::unique_ptr<std::thread>(new std::thread(&InteractionHandler::Routine, this));
return true;
}
void InteractionHandler::Exit() {
std::unique_lock<std::mutex> lk(mLock);
if (mState == INTERACTION_STATE_UNINITIALIZED)
return;
AbortWaitLocked();
mState = INTERACTION_STATE_UNINITIALIZED;
lk.unlock();
mCond.notify_all();
mThread->join();
close(mEventFd);
close(mIdleFd);
}
void InteractionHandler::PerfLock() {
ALOGV("%s: acquiring perf lock", __func__);
if (!mHintManager->DoHint("INTERACTION")) {
ALOGE("%s: do hint INTERACTION failed", __func__);
}
ATRACE_INT("interaction_lock", 1);
}
void InteractionHandler::PerfRel() {
ALOGV("%s: releasing perf lock", __func__);
if (!mHintManager->EndHint("INTERACTION")) {
ALOGE("%s: end hint INTERACTION failed", __func__);
}
ATRACE_INT("interaction_lock", 0);
}
size_t InteractionHandler::CalcTimespecDiffMs(struct timespec start, struct timespec end) {
size_t diff_in_us = 0;
diff_in_us += (end.tv_sec - start.tv_sec) * MSINSEC;
diff_in_us += (end.tv_nsec - start.tv_nsec) / USINMS;
return diff_in_us;
}
void InteractionHandler::Acquire(int32_t duration) {
ATRACE_CALL();
std::lock_guard<std::mutex> lk(mLock);
if (mState == INTERACTION_STATE_UNINITIALIZED) {
ALOGW("%s: called while uninitialized", __func__);
return;
}
int inputDuration = duration + 650;
int finalDuration;
if (inputDuration > mMaxDurationMs)
finalDuration = mMaxDurationMs;
else if (inputDuration > mMinDurationMs)
finalDuration = inputDuration;
else
finalDuration = mMinDurationMs;
struct timespec cur_timespec;
clock_gettime(CLOCK_MONOTONIC, &cur_timespec);
if (mState != INTERACTION_STATE_IDLE && finalDuration <= mDurationMs) {
size_t elapsed_time = CalcTimespecDiffMs(mLastTimespec, cur_timespec);
// don't hint if previous hint's duration covers this hint's duration
if (elapsed_time <= (mDurationMs - finalDuration)) {
ALOGV("%s: Previous duration (%d) cover this (%d) elapsed: %lld", __func__,
static_cast<int>(mDurationMs), static_cast<int>(finalDuration),
static_cast<long long>(elapsed_time));
return;
}
}
mLastTimespec = cur_timespec;
mDurationMs = finalDuration;
ALOGV("%s: input: %d final duration: %d", __func__, duration, finalDuration);
if (mState == INTERACTION_STATE_WAITING)
AbortWaitLocked();
else if (mState == INTERACTION_STATE_IDLE)
PerfLock();
mState = INTERACTION_STATE_INTERACTION;
mCond.notify_one();
}
void InteractionHandler::Release() {
std::lock_guard<std::mutex> lk(mLock);
if (mState == INTERACTION_STATE_WAITING) {
ATRACE_CALL();
PerfRel();
mState = INTERACTION_STATE_IDLE;
} else {
// clear any wait aborts pending in event fd
uint64_t val;
ssize_t ret = read(mEventFd, &val, sizeof(val));
ALOGW_IF(ret < 0, "%s: failed to clear eventfd (%zd, %d)", __func__, ret, errno);
}
}
// should be called while locked
void InteractionHandler::AbortWaitLocked() {
uint64_t val = 1;
ssize_t ret = write(mEventFd, &val, sizeof(val));
if (ret != sizeof(val))
ALOGW("Unable to write to event fd (%zd)", ret);
}
void InteractionHandler::WaitForIdle(int32_t wait_ms, int32_t timeout_ms) {
char data[MAX_LENGTH];
ssize_t ret;
struct pollfd pfd[2];
ATRACE_CALL();
ALOGV("%s: wait:%d timeout:%d", __func__, wait_ms, timeout_ms);
pfd[0].fd = mEventFd;
pfd[0].events = POLLIN;
pfd[1].fd = mIdleFd;
pfd[1].events = POLLPRI | POLLERR;
ret = poll(pfd, 1, wait_ms);
if (ret > 0) {
ALOGV("%s: wait aborted", __func__);
return;
} else if (ret < 0) {
ALOGE("%s: error in poll while waiting", __func__);
return;
}
ret = pread(mIdleFd, data, sizeof(data), 0);
if (!ret) {
ALOGE("%s: Unexpected EOF!", __func__);
return;
}
if (!strncmp(data, "idle", 4)) {
ALOGV("%s: already idle", __func__);
return;
}
ret = poll(pfd, 2, timeout_ms);
if (ret < 0)
ALOGE("%s: Error on waiting for idle (%zd)", __func__, ret);
else if (ret == 0)
ALOGV("%s: timed out waiting for idle", __func__);
else if (pfd[0].revents)
ALOGV("%s: wait for idle aborted", __func__);
else if (pfd[1].revents)
ALOGV("%s: idle detected", __func__);
}
void InteractionHandler::Routine() {
std::unique_lock<std::mutex> lk(mLock, std::defer_lock);
while (true) {
lk.lock();
mCond.wait(lk, [&] { return mState != INTERACTION_STATE_IDLE; });
if (mState == INTERACTION_STATE_UNINITIALIZED)
return;
mState = INTERACTION_STATE_WAITING;
lk.unlock();
WaitForIdle(mWaitMs, mDurationMs);
Release();
}
}