android STR suspend/resume framework

android STR suspend/resume framework

console:/sys/power # cat wake_lock
PowerManager.SuspendLockout PowerManagerService.Display

console:/sys/power # cat wake_unlock
KeyEvents PowerManagerService.WakeLocks

上述wake_lock、wake_unlock里的内容分别是如下incSuspendCounter()、decSuspendCounter()写进去的，mUseSuspendCounter的值是0：

systemhardwareinterfacessuspend1.0defaultSystemSuspend.cpp

void SystemSuspend::incSuspendCounter(const string& name) {
    auto l = std::lock_guard(mCounterLock);
    if (mUseSuspendCounter) {
        mSuspendCounter++;
    } else {
        if (!WriteStringToFd(name, mWakeLockFd)) {
            PLOG(ERROR) << "error writing " << name << " to " << kSysPowerWakeLock;
        }
    }
}

void SystemSuspend::decSuspendCounter(const string& name) {
    auto l = std::lock_guard(mCounterLock);
    if (mUseSuspendCounter) {
        if (--mSuspendCounter == 0) {
            mCounterCondVar.notify_one();
        }
    } else {
        if (!WriteStringToFd(name, mWakeUnlockFd)) {
            PLOG(ERROR) << "error writing " << name << " to " << kSysPowerWakeUnlock;
        }
    }
}

上面wake_lock写入路径

PowerManagerService.Display(hwbinder server端):

12-31 19:00:11.805  2746  2746 D listed wake lock: #00 pc 000000000000b868  /system/bin/hw/android.system.suspend@1.0-service (android::system::suspend::V1_0::SystemSuspend::incSuspendCounter(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&)+136)
12-31 19:00:11.805  2746  2746 D listed wake lock: #01 pc 000000000000c4dc  /system/bin/hw/android.system.suspend@1.0-service (android::system::suspend::V1_0::SystemSuspend::acquireWakeLock(android::system::suspend::V1_0::WakeLockType, android::hardware::hidl_string const&)+332)
12-31 19:00:11.805  2746  2746 D listed wake lock: #02 pc 000000000000fc64  /system/lib64/android.system.suspend@1.0.so (android::system::suspend::V1_0::BnHwSystemSuspend::_hidl_acquireWakeLock(android::hidl::base::V1_0::BnHwBase*, android::hardware::Parcel const&, android::hardware::Parcel*, std::__1::function<void (android::hardware::Parcel&)>)+252)
12-31 19:00:11.805  2746  2746 D listed wake lock: #03 pc 0000000000010194  /system/lib64/android.system.suspend@1.0.so (android::system::suspend::V1_0::BnHwSystemSuspend::onTransact(unsigned int, android::hardware::Parcel const&, android::hardware::Parcel*, unsigned int, std::__1::function<void (android::hardware::Parcel&)>)+316)
12-31 19:00:11.805  2746  2746 D listed wake lock: #04 pc 0000000000096604  /system/lib64/libhidlbase.so (android::hardware::BHwBinder::transact(unsigned int, android::hardware::Parcel const&, android::hardware::Parcel*, unsigned int, std::__1::function<void (android::hardware::Parcel&)>)+68)
12-31 19:00:11.805  2746  2746 D listed wake lock: #05 pc 0000000000099fcc  /system/lib64/libhidlbase.so (android::hardware::IPCThreadState::getAndExecuteCommand()+1036)
12-31 19:00:11.805  2746  2746 D listed wake lock: #06 pc 000000000009b1e0  /system/lib64/libhidlbase.so (android::hardware::IPCThreadState::joinThreadPool(bool)+96)
12-31 19:00:11.805  2746  2746 D listed wake lock: #07 pc 000000000000a608  /system/bin/hw/android.system.suspend@1.0-service (main+1464)
12-31 19:00:11.805  2746  2746 D listed wake lock: #08 pc 000000000007d844  /apex/com.android.runtime/lib64/bionic/libc.so (__libc_init+108)
12-31 19:00:11.805  2746  2746 E /system/bin/hw/android.system.suspend@1.0-service: inc suspend cnt, name:PowerManagerService.DisplaymUseSuspendCounter: 0: Success

上面wake_unlock写入路径：

PowerManagerService.WakeLocks(hwbinder serser端)：

09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #00 pc 000000000000cbb4  /system/bin/hw/android.system.suspend@1.0-service (android::system::suspend::V1_0::SystemSuspend::decSuspendCounter(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&)+116)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #01 pc 000000000000d1a4  /system/bin/hw/android.system.suspend@1.0-service (_ZNSt3__117__call_once_proxyINS_5tupleIJOZN7android6system7suspend4V1_08WakeLock11releaseOnceEvEUlvE_EEEEEvPv+52)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #02 pc 00000000000b0f74  /system/lib64/libc++.so (std::__1::__call_once(unsigned long volatile&, void*, void (*)(void*))+156)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #03 pc 000000000000bcc8  /system/bin/hw/android.system.suspend@1.0-service (android::system::suspend::V1_0::WakeLock::release()+80)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #04 pc 0000000000016f5c  /system/lib64/android.system.suspend@1.0.so (android::system::suspend::V1_0::BnHwWakeLock::_hidl_release(android::hidl::base::V1_0::BnHwBase*, android::hardware::Parcel const&, android::hardware::Parcel*, std::__1::function<void (android::hardware::Parcel&)>)+164)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #05 pc 000000000001734c  /system/lib64/android.system.suspend@1.0.so (android::system::suspend::V1_0::BnHwWakeLock::onTransact(unsigned int, android::hardware::Parcel const&, android::hardware::Parcel*, unsigned int, std::__1::function<void (android::hardware::Parcel&)>)+308)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #06 pc 0000000000096604  /system/lib64/libhidlbase.so (android::hardware::BHwBinder::transact(unsigned int, android::hardware::Parcel const&, android::hardware::Parcel*, unsigned int, std::__1::function<void (android::hardware::Parcel&)>)+68)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #07 pc 0000000000099fcc  /system/lib64/libhidlbase.so (android::hardware::IPCThreadState::getAndExecuteCommand()+1036)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #08 pc 000000000009b1e0  /system/lib64/libhidlbase.so (android::hardware::IPCThreadState::joinThreadPool(bool)+96)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #09 pc 000000000000a608  /system/bin/hw/android.system.suspend@1.0-service (main+1464)
09-19 09:31:00.023  2748  2748 D listed wake unlock(a on): #10 pc 000000000007d844  /apex/com.android.runtime/lib64/bionic/libc.so (__libc_init+108)
09-19 09:31:00.023  2748  2748 E /system/bin/hw/android.system.suspend@1.0-service: dec suspend cnt, name:PowerManagerService.WakeLocksmUseSuspendCounter: 0: Success

STR待机过程中，会先将wake_lock里的lock release，在STR resume时再acquire lock：

STR待机过程中release lock(PowerManagerService.Display)：

09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #00 pc 000000000000cc28  /system/bin/hw/android.system.suspend@1.0-service (android::system::suspend::V1_0::SystemSuspend::decSuspendCounter(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&)+232)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #01 pc 000000000000d1a4  /system/bin/hw/android.system.suspend@1.0-service (_ZNSt3__117__call_once_proxyINS_5tupleIJOZN7android6system7suspend4V1_08WakeLock11releaseOnceEvEUlvE_EEEEEvPv+52)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #02 pc 00000000000b0f74  /system/lib64/libc++.so (std::__1::__call_once(unsigned long volatile&, void*, void (*)(void*))+156)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #03 pc 000000000000bcc8  /system/bin/hw/android.system.suspend@1.0-service (android::system::suspend::V1_0::WakeLock::release()+80)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #04 pc 0000000000016f5c  /system/lib64/android.system.suspend@1.0.so (android::system::suspend::V1_0::BnHwWakeLock::_hidl_release(android::hidl::base::V1_0::BnHwBase*, android::hardware::Parcel const&, android::hardware::Parcel*, std::__1::function<void (android::hardware::Parcel&)>)+164)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #05 pc 000000000001734c  /system/lib64/android.system.suspend@1.0.so (android::system::suspend::V1_0::BnHwWakeLock::onTransact(unsigned int, android::hardware::Parcel const&, android::hardware::Parcel*, unsigned int, std::__1::function<void (android::hardware::Parcel&)>)+308)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #06 pc 0000000000096604  /system/lib64/libhidlbase.so (android::hardware::BHwBinder::transact(unsigned int, android::hardware::Parcel const&, android::hardware::Parcel*, unsigned int, std::__1::function<void (android::hardware::Parcel&)>)+68)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #07 pc 0000000000099fcc  /system/lib64/libhidlbase.so (android::hardware::IPCThreadState::getAndExecuteCommand()+1036)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #08 pc 000000000009b1e0  /system/lib64/libhidlbase.so (android::hardware::IPCThreadState::joinThreadPool(bool)+96)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #09 pc 000000000000a608  /system/bin/hw/android.system.suspend@1.0-service (main+1464)
09-19 09:36:24.666  2748  2748 D listed wake unlock(suspend): #10 pc 000000000007d844  /apex/com.android.runtime/lib64/bionic/libc.so (__libc_init+108)
09-19 09:36:24.666  2748  2748 E /system/bin/hw/android.system.suspend@1.0-service: dec suspend cnt, name:PowerManagerService.DisplaymUseSuspendCounter: 0: Success

wakeup count file

systemhardwareinterfacessuspend1.0defaultmain.cpp

static constexpr char kSysPowerWakeupCount[] = "/sys/power/wakeup_count";
int main() {
    unique_fd wakeupCountFd{TEMP_FAILURE_RETRY(open(kSysPowerWakeupCount, O_CLOEXEC | O_RDWR))};
    sp<SystemSuspend> suspend =
        new SystemSuspend(std::move(wakeupCountFd), std::move(stateFd), 100 /* maxStatsEntries */,
                          100ms /* baseSleepTime */, suspendControl, false /* mUseSuspendCounter*/);
    status_t status = suspend->registerAsService();

SystemSuspend::SystemSuspend(unique_fd wakeupCountFd, unique_fd stateFd, size_t maxStatsEntries,
                             std::chrono::milliseconds baseSleepTime,
                             const sp<SuspendControlService>& controlService,
                             bool useSuspendCounter)
    : mSuspendCounter(0),
      mWakeupCountFd(std::move(wakeupCountFd)),