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高通hypervisor display框架解析

9月前 作者：norlan_jame 分类：Toy博客 阅读(34) 违法举报

这篇具有很好参考价值的文章主要介绍了高通hypervisor display框架解析。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

高通hypervisor display的架构

下面这张图是高通文档上能看到的对于高通hypervisor的display显示框架，但是关于QNX和LA侧是如何交互的，好像没有找到相关的文档介绍。

openwfd,高通hypervisor display,html5,前端,html

正好最近遇到了一些和display相关的问题，趁着这个档口稍微研究了下QNX和LA侧两边是怎么交互的

Hypervisor Display架构部分细节解析

下图是对前面那张图的细节补充

openwfd,高通hypervisor display,html5,前端,html

 1，所有LA侧的APP与显示相关的调用最终都会交由SurfaceFlinger处理

2，SurfaceFlinger会最终调用android.hardware.graphics.composer@2.4-service服务

3，android.hardware.graphics.composer@2.4-service服务会调用GPU&DRM&Qcom的一些列库文件（很遗憾这些库相当一大部分源码是不开源的）

4，libdrm库调用open/ioctl等函数会经过lib_drm_fe库的转接，当然lib_drm_fe会做很多其他适配的工作

5，lib_drm_fe会调用内核HGSL驱动中的hab通信接口与QNX侧的wfd_be服务进行通信

6，wfd_be服务会解析接收到的LA侧的数据包

7，根据数据包中的命令类型调用不同的openwfd接口，需要注意的是，这里的接口是做了一层转换的，举个例子wfdEnumerateDevices_Host，这个接口会进行转换之后真正调用wfdEnumerateDevices函数

8，所有的操作都执行完成之后，如果有必要会唤醒wfd_be的commit&vsync现场，通知openwfd刷新画面

更细节的框图：

openwfd,高通hypervisor display,html5,前端,html

Surfaceflinger backtrace

这个backtrace是刚好有个和display相关的问题复现的时候的backtrace，比较难得的能抓到整个surfaceflinger block住的状态

msmnile_gvmq:/ # debuggerd -b 423
debuggerd -b 423


----- pid 423 at 2023-01-15 19:27:49 -----
Cmd line: /vendor/bin/hw/android.hardware.graphics.composer@2.4-service
ABI: 'arm64'

"composer@2.4-se" sysTid=423
    #00 pc 000000000009b0f4  /apex/com.android.runtime/lib64/bionic/libc.so (__ioctl+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 0000000000057de0  /apex/com.android.runtime/lib64/bionic/libc.so (ioctl+156) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 0000000000097bbc  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::IPCThreadState::getAndExecuteCommand()+172) (BuildId: d9c65f1690822c418040f1143712be80)
    #03 pc 000000000009918c  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::IPCThreadState::joinThreadPool(bool)+96) (BuildId: d9c65f1690822c418040f1143712be80)
    #04 pc 000000000000a1c4  /vendor/bin/hw/android.hardware.graphics.composer@2.4-service (main+380) (BuildId: 7e1ed405d730e4909758105094182804)
    #05 pc 00000000000499fc  /apex/com.android.runtime/lib64/bionic/libc.so (__libc_init+108) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"Binder:423_1" sysTid=476
    #00 pc 000000000009b0f4  /apex/com.android.runtime/lib64/bionic/libc.so (__ioctl+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 0000000000057de0  /apex/com.android.runtime/lib64/bionic/libc.so (ioctl+156) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 0000000000047a0c  /apex/com.android.vndk.v30/lib64/libbinder.so (android::IPCThreadState::talkWithDriver(bool)+296) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #03 pc 0000000000047bfc  /apex/com.android.vndk.v30/lib64/libbinder.so (android::IPCThreadState::getAndExecuteCommand()+24) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #04 pc 00000000000484b8  /apex/com.android.vndk.v30/lib64/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+60) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #05 pc 000000000006ff80  /apex/com.android.vndk.v30/lib64/libbinder.so (android::PoolThread::threadLoop()+24) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #06 pc 00000000000154d0  /apex/com.android.vndk.v30/lib64/libutils.so (android::Thread::_threadLoop(void*)+260) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #07 pc 0000000000014d94  /apex/com.android.vndk.v30/lib64/libutils.so (thread_data_t::trampoline(thread_data_t const*)+412) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #08 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #09 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"Binder:423_2" sysTid=477
    #00 pc 000000000009b0f4  /apex/com.android.runtime/lib64/bionic/libc.so (__ioctl+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 0000000000057de0  /apex/com.android.runtime/lib64/bionic/libc.so (ioctl+156) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 0000000000047a0c  /apex/com.android.vndk.v30/lib64/libbinder.so (android::IPCThreadState::talkWithDriver(bool)+296) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #03 pc 0000000000047bfc  /apex/com.android.vndk.v30/lib64/libbinder.so (android::IPCThreadState::getAndExecuteCommand()+24) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #04 pc 00000000000484b8  /apex/com.android.vndk.v30/lib64/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+60) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #05 pc 000000000006ff80  /apex/com.android.vndk.v30/lib64/libbinder.so (android::PoolThread::threadLoop()+24) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #06 pc 00000000000154d0  /apex/com.android.vndk.v30/lib64/libutils.so (android::Thread::_threadLoop(void*)+260) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #07 pc 0000000000014d94  /apex/com.android.vndk.v30/lib64/libutils.so (thread_data_t::trampoline(thread_data_t const*)+412) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #08 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #09 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"HWC_UeventThrea" sysTid=530
    #00 pc 000000000009c1b4  /apex/com.android.runtime/lib64/bionic/libc.so (__ppoll+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 000000000005a3c0  /apex/com.android.runtime/lib64/bionic/libc.so (poll+92) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 0000000000004a98  /apex/com.android.vndk.v30/lib64/libhardware_legacy.so (uevent_next_event+84) (BuildId: 0ce074f6b680597fc37aded2a96805a4)
    #03 pc 0000000000027b98  /vendor/lib64/hw/hwcomposer.msmnile.so (sdm::HWCUEvent::UEventThread(sdm::HWCUEvent*)+212) (BuildId: 6ca7495298a58781238d1b65a06601a9)
    #04 pc 00000000000340b0  /vendor/lib64/hw/hwcomposer.msmnile.so (void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(sdm::HWCUEvent*), sdm::HWCUEvent*> >(void*)+40) (BuildId: 6ca7495298a58781238d1b65a06601a9)
    #05 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #06 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"DRMFE_EventList" sysTid=543
    #00 pc 000000000009b0f8  /apex/com.android.runtime/lib64/bionic/libc.so (__ioctl+8) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 0000000000057de0  /apex/com.android.runtime/lib64/bionic/libc.so (ioctl+156) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 0000000000002698  /vendor/lib64/libuhab.so (habmm_socket_recv+104) (BuildId: e82477cd90bbe46d4a48faaf5486a0e4)
    #03 pc 000000000001e8c4  /vendor/lib64/lib_drm_fe.so (user_os_utils_recv+216) (BuildId: ad7158dd9eba42d5bc2e156cebb4bf0a)
    #04 pc 00000000000196e8  /vendor/lib64/lib_drm_fe.so (event_listener+312) (BuildId: ad7158dd9eba42d5bc2e156cebb4bf0a)
    #05 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #06 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"SDM_EventThread" sysTid=550
    #00 pc 000000000009c1b4  /apex/com.android.runtime/lib64/bionic/libc.so (__ppoll+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 000000000005a3c0  /apex/com.android.runtime/lib64/bionic/libc.so (poll+92) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 000000000007a534  /vendor/lib64/libsdmcore.so (sdm::HWEventsDRM::DisplayEventHandler()+216) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #03 pc 00000000000798cc  /vendor/lib64/libsdmcore.so (sdm::HWEventsDRM::DisplayEventThread(void*)+12) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #04 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #05 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"HwBinder:423_1" sysTid=561
    #00 pc 000000000009b0f4  /apex/com.android.runtime/lib64/bionic/libc.so (__ioctl+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 0000000000057de0  /apex/com.android.runtime/lib64/bionic/libc.so (ioctl+156) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 0000000000097bbc  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::IPCThreadState::getAndExecuteCommand()+172) (BuildId: d9c65f1690822c418040f1143712be80)
    #03 pc 000000000009918c  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::IPCThreadState::joinThreadPool(bool)+96) (BuildId: d9c65f1690822c418040f1143712be80)
    #04 pc 00000000000a83b0  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::PoolThread::threadLoop()+24) (BuildId: d9c65f1690822c418040f1143712be80)
    #05 pc 00000000000154d0  /apex/com.android.vndk.v30/lib64/libutils.so (android::Thread::_threadLoop(void*)+260) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #06 pc 0000000000014d94  /apex/com.android.vndk.v30/lib64/libutils.so (thread_data_t::trampoline(thread_data_t const*)+412) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #07 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #08 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"HwBinder:423_2" sysTid=562
    #00 pc 000000000009c1b4  /apex/com.android.runtime/lib64/bionic/libc.so (__ppoll+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 000000000005a3c0  /apex/com.android.runtime/lib64/bionic/libc.so (poll+92) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 000000000001896c  /vendor/lib64/lib_drm_fe.so (drm_sync_wait_fe+68) (BuildId: ad7158dd9eba42d5bc2e156cebb4bf0a)
    #03 pc 0000000000013648  /vendor/lib64/lib_drm_fe.so (drm_crtc_wait_for_fence_fe+360) (BuildId: ad7158dd9eba42d5bc2e156cebb4bf0a)
    #04 pc 0000000000014280  /vendor/lib64/lib_drm_fe.so (drm_atomic_prepare_commit_fe+220) (BuildId: ad7158dd9eba42d5bc2e156cebb4bf0a)
    #05 pc 0000000000014c10  /vendor/lib64/lib_drm_fe.so (drm_atomic_complete_commit_fe+236) (BuildId: ad7158dd9eba42d5bc2e156cebb4bf0a)
    #06 pc 00000000000158d4  /vendor/lib64/lib_drm_fe.so (drm_mode_atomic_commit_fe+912) (BuildId: ad7158dd9eba42d5bc2e156cebb4bf0a)
    #07 pc 000000000000f0a0  /vendor/lib64/lib_drm_fe.so (drmioctl_fe+864) (BuildId: ad7158dd9eba42d5bc2e156cebb4bf0a)
    #08 pc 0000000000007298  /vendor/lib64/libdrm.so (drmIoctl+104) (BuildId: 9db896bc552bb813f81c52df388f1f55)
    #09 pc 0000000000011230  /vendor/lib64/libdrm.so (drmModeAtomicCommit+816) (BuildId: 9db896bc552bb813f81c52df388f1f55)
    #10 pc 000000000002b020  /vendor/lib64/libsdedrm.so (sde_drm::DRMAtomicReq::Commit(bool, bool)+156) (BuildId: 259c96354001f6853b4a7359dc6b1b62)
    #11 pc 00000000000703e0  /vendor/lib64/libsdmcore.so (sdm::HWDeviceDRM::AtomicCommit(sdm::HWLayers*)+140) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #12 pc 000000000006ffe8  /vendor/lib64/libsdmcore.so (sdm::HWDeviceDRM::Commit(sdm::HWLayers*)+120) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #13 pc 0000000000074bbc  /vendor/lib64/libsdmcore.so (sdm::HWPeripheralDRM::Commit(sdm::HWLayers*)+436) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #14 pc 0000000000035b80  /vendor/lib64/libsdmcore.so (sdm::DisplayBase::Commit(sdm::LayerStack*)+364) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #15 pc 0000000000040e14  /vendor/lib64/libsdmcore.so (sdm::DisplayBuiltIn::Commit(sdm::LayerStack*)+340) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #16 pc 000000000004253c  /vendor/lib64/hw/hwcomposer.msmnile.so (sdm::HWCDisplay::CommitLayerStack()+396) (BuildId: 6ca7495298a58781238d1b65a06601a9)
    #17 pc 0000000000049e58  /vendor/lib64/hw/hwcomposer.msmnile.so (sdm::HWCDisplayBuiltIn::Present(int*)+496) (BuildId: 6ca7495298a58781238d1b65a06601a9)
    #18 pc 000000000002a9f0  /vendor/lib64/hw/hwcomposer.msmnile.so (sdm::HWCSession::PresentDisplay(hwc2_device*, unsigned long, int*)+544) (BuildId: 6ca7495298a58781238d1b65a06601a9)
    #19 pc 000000000000b8f0  /vendor/bin/hw/android.hardware.graphics.composer@2.4-service (android::hardware::graphics::composer::V2_1::passthrough::detail::HwcHalImpl<android::hardware::graphics::composer::V2_4::hal::ComposerHal>::presentDisplay(unsigned long, int*, std::__1::vector<unsigned long, std::__1::allocator<unsigned long> >*, std::__1::vector<int, std::__1::allocator<int> >*)+68) (BuildId: 7e1ed405d730e4909758105094182804)
    #20 pc 00000000000173f8  /vendor/bin/hw/android.hardware.graphics.composer@2.4-service (android::hardware::graphics::composer::V2_1::hal::ComposerCommandEngine::executePresentDisplay(unsigned short)+104) (BuildId: 7e1ed405d730e4909758105094182804)
    #21 pc 0000000000016484  /vendor/bin/hw/android.hardware.graphics.composer@2.4-service (android::hardware::graphics::composer::V2_1::hal::ComposerCommandEngine::executeCommand(android::hardware::graphics::composer::V2_1::IComposerClient::Command, unsigned short)+236) (BuildId: 7e1ed405d730e4909758105094182804)
    #22 pc 0000000000014e54  /vendor/bin/hw/android.hardware.graphics.composer@2.4-service (android::hardware::graphics::composer::V2_1::hal::ComposerCommandEngine::execute(unsigned int, android::hardware::hidl_vec<android::hardware::hidl_handle> const&, bool*, unsigned int*, android::hardware::hidl_vec<android::hardware::hidl_handle>*)+136) (BuildId: 7e1ed405d730e4909758105094182804)
    #23 pc 0000000000012a18  /vendor/bin/hw/android.hardware.graphics.composer@2.4-service (android::hardware::graphics::composer::V2_1::hal::detail::ComposerClientImpl<android::hardware::graphics::composer::V2_1::IComposerClient, android::hardware::graphics::composer::V2_1::hal::ComposerHal>::executeCommands(unsigned int, android::hardware::hidl_vec<android::hardware::hidl_handle> const&, std::__1::function<void (android::hardware::graphics::composer::V2_1::Error, bool, unsigned int, android::hardware::hidl_vec<android::hardware::hidl_handle> const&)>)+108) (BuildId: 7e1ed405d730e4909758105094182804)
    #24 pc 000000000002803c  /apex/com.android.vndk.v30/lib64/android.hardware.graphics.composer@2.2.so (android::hardware::graphics::composer::V2_2::BnHwComposerClient::_hidl_executeCommands_2_2(android::hidl::base::V1_0::BnHwBase*, android::hardware::Parcel const&, android::hardware::Parcel*, std::__1::function<void (android::hardware::Parcel&)>)+528) (BuildId: 1ed6665f715cc1e48077f38fd2225c9c)
    #25 pc 0000000000041e30  /apex/com.android.vndk.v30/lib64/android.hardware.graphics.composer@2.4.so (android::hardware::graphics::composer::V2_4::BnHwComposerClient::onTransact(unsigned int, android::hardware::Parcel const&, android::hardware::Parcel*, unsigned int, std::__1::function<void (android::hardware::Parcel&)>)+600) (BuildId: d21eaf84de0eeb98a1488c8f69b0d718)
    #26 pc 0000000000093fac  /apex/com.android.vndk.v30/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) (BuildId: d9c65f1690822c418040f1143712be80)
    #27 pc 0000000000097f44  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::IPCThreadState::getAndExecuteCommand()+1076) (BuildId: d9c65f1690822c418040f1143712be80)
    #28 pc 000000000009918c  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::IPCThreadState::joinThreadPool(bool)+96) (BuildId: d9c65f1690822c418040f1143712be80)
    #29 pc 00000000000a83b0  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::PoolThread::threadLoop()+24) (BuildId: d9c65f1690822c418040f1143712be80)
    #30 pc 00000000000154d0  /apex/com.android.vndk.v30/lib64/libutils.so (android::Thread::_threadLoop(void*)+260) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #31 pc 0000000000014d94  /apex/com.android.vndk.v30/lib64/libutils.so (thread_data_t::trampoline(thread_data_t const*)+412) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #32 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #33 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"SDM_EventThread" sysTid=598
    #00 pc 000000000009c1b4  /apex/com.android.runtime/lib64/bionic/libc.so (__ppoll+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 000000000005a3c0  /apex/com.android.runtime/lib64/bionic/libc.so (poll+92) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 000000000007a534  /vendor/lib64/libsdmcore.so (sdm::HWEventsDRM::DisplayEventHandler()+216) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #03 pc 00000000000798cc  /vendor/lib64/libsdmcore.so (sdm::HWEventsDRM::DisplayEventThread(void*)+12) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #04 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #05 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"SDM_EventThread" sysTid=600
    #00 pc 000000000009c1b4  /apex/com.android.runtime/lib64/bionic/libc.so (__ppoll+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 000000000005a3c0  /apex/com.android.runtime/lib64/bionic/libc.so (poll+92) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 000000000007a534  /vendor/lib64/libsdmcore.so (sdm::HWEventsDRM::DisplayEventHandler()+216) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #03 pc 00000000000798cc  /vendor/lib64/libsdmcore.so (sdm::HWEventsDRM::DisplayEventThread(void*)+12) (BuildId: c80e3f1cd75b3f23581f923f1170aeea)
    #04 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #05 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"Binder:423_3" sysTid=10830
    #00 pc 000000000009b0f4  /apex/com.android.runtime/lib64/bionic/libc.so (__ioctl+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 0000000000057de0  /apex/com.android.runtime/lib64/bionic/libc.so (ioctl+156) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 0000000000047a0c  /apex/com.android.vndk.v30/lib64/libbinder.so (android::IPCThreadState::talkWithDriver(bool)+296) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #03 pc 0000000000047bfc  /apex/com.android.vndk.v30/lib64/libbinder.so (android::IPCThreadState::getAndExecuteCommand()+24) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #04 pc 00000000000484b8  /apex/com.android.vndk.v30/lib64/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+60) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #05 pc 000000000006ff80  /apex/com.android.vndk.v30/lib64/libbinder.so (android::PoolThread::threadLoop()+24) (BuildId: 4e678e29aecf2b6af558fbad12d0a468)
    #06 pc 00000000000154d0  /apex/com.android.vndk.v30/lib64/libutils.so (android::Thread::_threadLoop(void*)+260) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #07 pc 0000000000014d94  /apex/com.android.vndk.v30/lib64/libutils.so (thread_data_t::trampoline(thread_data_t const*)+412) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #08 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #09 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

"HwBinder:423_3" sysTid=10831
    #00 pc 000000000009b0f4  /apex/com.android.runtime/lib64/bionic/libc.so (__ioctl+4) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #01 pc 0000000000057de0  /apex/com.android.runtime/lib64/bionic/libc.so (ioctl+156) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #02 pc 0000000000097bbc  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::IPCThreadState::getAndExecuteCommand()+172) (BuildId: d9c65f1690822c418040f1143712be80)
    #03 pc 000000000009918c  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::IPCThreadState::joinThreadPool(bool)+96) (BuildId: d9c65f1690822c418040f1143712be80)
    #04 pc 00000000000a83b0  /apex/com.android.vndk.v30/lib64/libhidlbase.so (android::hardware::PoolThread::threadLoop()+24) (BuildId: d9c65f1690822c418040f1143712be80)
    #05 pc 00000000000154d0  /apex/com.android.vndk.v30/lib64/libutils.so (android::Thread::_threadLoop(void*)+260) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #06 pc 0000000000014d94  /apex/com.android.vndk.v30/lib64/libutils.so (thread_data_t::trampoline(thread_data_t const*)+412) (BuildId: 302a93d93d50a20e71c051933fe98b5f)
    #07 pc 00000000000afecc  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)
    #08 pc 0000000000050408  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 8d0a10271eef02de6c33b788fec2db37)

----- end 423 -----

相关概念补充

有关commit:

在OpenWFD或者其他图形系统中，"commit"的概念通常指的是将一系列的更改或更新应用到图形系统，使得这些更改在屏幕上可见。

在你对系统做了一系列的更改后，例如更改了图形对象的属性，或者更改了绘制命令，这些更改在内存中进行，但并不会立即反映到屏幕上。这是因为立即更新屏幕会导致屏幕频繁刷新，这会消耗大量的系统资源，并且可能导致屏幕闪烁。因此，你可以在内存中做所有的更改，然后在完成所有更改后，通过调用"commit"操作，将这些更改一次性应用到屏幕上。

在OpenWFD中，有一个API函数叫做"wfdDeviceCommit"，它的功能就是执行这个"commit"操作。当你调用这个函数时，所有之前对设备做的更改（例如设置设备属性或者更改端口模式）都会被应用，这些更改将会在下一次屏幕刷新时可见。

这种"commit"机制在许多图形系统中都很常见，包括OpenWFD和Wayland等，它们都使用这种机制来优化屏幕更新和减少资源使用。

有关vsync:

"VSync"是"垂直同步"的缩写，这是一种在计算机图形中常见的技术，用于解决屏幕撕裂（screen tearing）问题。屏幕撕裂是当计算机的图形处理器（GPU）输出的帧率超过显示器的刷新率时，一帧的上半部分和下半部分不同步，导致画面看起来像是被撕裂了一样。

垂直同步技术通过同步GPU的帧输出速度和显示器的刷新率来避免屏幕撕裂。具体来说，当启用VSync时，GPU会等到显示器完成一次完整的垂直刷新（从上到下更新所有像素）后，才开始渲染下一帧。这样可以确保在显示器每次刷新时，只有一帧数据被发送到显示器，避免了屏幕撕裂。

然而，垂直同步也有一些缺点。由于GPU需要等待显示器完成刷新，如果GPU的渲染速度非常快，这可能会导致GPU的性能没有得到充分利用。此外，如果GPU的帧率低于显示器的刷新率，用户可能会感觉到画面卡顿。因此，垂直同步是否启用，以及如何配置垂直同步，往往取决于具体的应用需求和硬件性能。

在OpenWFD中，可能有相关的API或设置用于控制垂直同步，但具体的实现和使用可能会根据不同的OpenWFD实现和硬件配置有所不同。文章来源地址https://www.toymoban.com/news/detail-644011.html

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