qt5 - raspberry2 上的eglfs -- * 未能添加服务 - 已在使用中？

Question

这是我在这里发表的第一篇文章。

我想长话短说......

以下问题:

我想在树莓派2b上利用eglfs后端运行qt5/qtquickcontrols2应用程序，当然，由vc4加速。理想情况下，它应该在 kiosk 模式下运行，并且肯定需要加速 gl 功能。为了尽量减少问题，我使用以下命令进行了测试:

LD_PRELOAD="/opt/vc/lib/libGLESv2.so/opt/vc/lib/libEGL.so"qmlscene ./gallery.qml

其中 gallery.qml 只是来自 qt-creator 的小部件预览示例项目(遵循 these 说明...)。我收到以下错误输出:

[manjaro@Loki gallery]$ LD_PRELOAD="/opt/vc/lib/libGLESv2.so /opt/vc/lib/libEGL.so" qmlscene ./gallery.qml
qt.qpa.egldeviceintegration: EGL device integration plugin keys: ("eglfs_brcm", "eglfs_kms", "eglfs_x11")
qt.qpa.egldeviceintegration: EGL device integration plugin keys (sorted): ("eglfs_brcm", "eglfs_kms", "eglfs_x11")
qt.qpa.egldeviceintegration: Trying to load device EGL integration "eglfs_brcm"
qt.qpa.egldeviceintegration: Using EGL device integration "eglfs_brcm"
* failed to add service - already in use?

我还测试了运行交叉编译的二进制文件的相同情况 - 相同的错误。除了最后一行之外的所有内容都来自 qt5 的详细调试输出，我通过环境变量设置，详细信息如下。

系统/环境:

• 树莓派2b
• qt-5.7.0
• Manjaro-ARM(基于 Arch Linux ARM)
• 所有固件、工具、启动内容、内核均已安装并保持最新

其他设置...

[manjaro@Loki gallery]$ uname -a
Linux Loki 4.4.28-1-MANJARO-ARM #1 SMP Sat Oct 29 21:01:09 CDT 2016 armv7l GNU/Linux

我的config.txt

dtparam=audio=on
#hdmi_drive=2
avoid_warnings=2
disable_overscan=1
disable_splash=1
boot_delay=0

# activate raspi cam
start_x=1

# tuning gpu accel and memory usage
gpu_mem=320
dtoverlay=vc4-kms-v3d

我的cmdline.txt

root=/dev/mmcblk0p2 rw  rootwait console=tty1 selinux=0 quiet plymouth.ignore-serial-consoles dwc_otg.lpm_enable=0 elevator=deadline fsck.repair=yes

printenv 给出以下内容:

XDG_SESSION_ID=c1
TERM=xterm
SHELL=/bin/bash
SSH_CLIENT=192.168.0.100 43274 22
QT_QPA_EGLFS_INTEGRATION=eglfs_brcm
OLDPWD=/home/manjaro
SSH_TTY=/dev/pts/0
USER=manjaro
MOZ_PLUGIN_PATH=/usr/lib/mozilla/plugins
MAIL=/var/spool/mail/manjaro
PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/vc/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
PWD=/home/manjaro/opt
LANG=de_DE.UTF-8
QT_QPA_PLATFORM=eglfs
SHLVL=1
HOME=/home/manjaro
LOGNAME=manjaro
QT_LOGGING_RULES=qt.qpa.*=true
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
SSH_CONNECTION=192.168.0.100 43274 192.168.0.107 22
XDG_RUNTIME_DIR=/run/user/1000
_=/usr/bin/printenv

您可以看到几个 Qt 特定设置:调试、使用eglfs作为默认后端以及最有趣的:QT_QPA_EGLFS_INTEGRATION=eglfs_brcm 这意味着应该使用 Broadcom eglfs 插件。沿着eglfs_brcm我也尝试了eglfs_kms(只是出于好奇):

[manjaro@Loki gallery]$ export QT_QPA_EGLFS_INTEGRATION=eglfs_kms
[manjaro@Loki gallery]$ LD_PRELOAD="/opt/vc/lib/libGLESv2.so /opt/vc/lib/libEGL.so" qmlscene ./gallery.qml 
qt.qpa.egldeviceintegration: EGL device integration plugin keys: ("eglfs_brcm", "eglfs_kms", "eglfs_x11")
qt.qpa.egldeviceintegration: EGL device integration plugin keys (sorted): ("eglfs_kms", "eglfs_brcm", "eglfs_x11")
qt.qpa.egldeviceintegration: Trying to load device EGL integration "eglfs_kms"
qt.qpa.egldeviceintegration: Using EGL device integration "eglfs_kms"
qt.qpa.input: udev device discovery for type QFlags(0x10)
qt.qpa.input: Found matching devices ("/dev/dri/card0")
qt.qpa.eglfs.kms: Found the following video devices: ("/dev/dri/card0")
qt.qpa.eglfs.kms: Using "/dev/dri/card0"
qt.qpa.eglfs.kms: Opening device "/dev/dri/card0"
qt.qpa.eglfs.kms: Creating GBM device for file descriptor 5 obtained from "/dev/dri/card0"
* failed to add service - already in use?

看来既不是视频核心的问题，也不是manjaro-arm的“库存”Qt的问题。它只是说有些东西可能被阻止，但是什么？有什么提示吗？

覆盖层和驱动程序似乎有效，glxgears 在 xfce4 上运行时达到了约 60FPS。以下也很有趣:

[root@Loki gallery]# vcdbg log msg|& grep -v gpioman|grep -iv hdmi
001042.905: *** Restart logging
001043.889: Read command line from file 'cmdline.txt'
root=/dev/mmcblk0p2 rw  rootwait console=tty1 selinux=0 nofb dwc_otg.lpm_enable=0 elevator=deadline fsck.repair=yes
001409.425: Loading 'kernel7.img' to 0x8000 size 0x5ea25c
001413.076: Kernel trailer DTOK property says yes
001413.091: Kernel trailer DDTK property says yes
001415.514: Loading 'bcm2709-rpi-2-b.dtb' to 0x5f225c size 0x3bfc
001514.479: dtparam: audio=on
001567.591: Loaded overlay 'vc4-kms-v3d'
001836.841: Device tree loaded to 0x2effbc00 (size 0x430d)
005904.220: vchiq_core: vchiq_init_state: slot_zero = 0xd0400000, is_master = 1
005911.919: TV service:host side not connected, dropping notification 0x00000002, 0x00000001, 0x00000010
007999.619: camsubs: Looking for camera 0: i2c_port = 0, led gpio = 32, power enable gpio = 41
008000.339: camsubs: Camera not found
008000.377: camsubs: Looking for camera 0: i2c_port = 0, led gpio = 32, power enable gpio = 41
008001.091: camsubs: Camera not found
008001.128: camsubs: Looking for camera 0: i2c_port = 0, led gpio = 32, power enable gpio = 41
008001.844: camsubs: Camera not found

对我来说看起来很像。

我尝试了以下操作:

我尝试了 gpu_mem split，尝试了 128 到 448 之间的值。检查 GPU 内存看起来符合预期，但对执行提到的应用程序没有影响。

[manjaro@Loki gallery]$ vcgencmd get_mem gpu
gpu=320M

我还创建了以下 udev 规则以修复我最初遇到的错误

[manjaro@Loki gallery]$ cat /etc/udev/rules.d/10-vchiq-permissions.rules 
SUBSYSTEM=="vchiq",GROUP="video",MODE="0660"

[manjaro@Loki gallery]$ groups
wheel video storage power users

如果没有提到的 udev 规则，我会收到以下错误:

[manjaro@Loki gallery]$ LD_PRELOAD="/opt/vc/lib/libGLESv2.so /opt/vc/lib/libEGL.so" qmlscene ./gallery.qml 
qt.qpa.egldeviceintegration: EGL device integration plugin keys: ("eglfs_brcm", "eglfs_kms", "eglfs_x11")
qt.qpa.egldeviceintegration: EGL device integration plugin keys (sorted): ("eglfs_brcm", "eglfs_kms", "eglfs_x11")
qt.qpa.egldeviceintegration: Trying to load device EGL integration "eglfs_brcm"
qt.qpa.egldeviceintegration: Using EGL device integration "eglfs_brcm"
* failed to open vchiq instance

该死...我现在没有主意了...我很感激每一个可以帮助的小提示......

请不要:

• 回答阅读几个文档(我已经花了很多时间)
• 建议尝试其他发行版(这不是解决方案)
• 建议重新刷新我的 SD 卡(也不是解决方案)

谁让 Qt-5.7/qtquickcontrols2/QML 通过 EGLFS 利用 vc4 在 raspberrypi 2 上工作？？？非常非常感谢您的每一个面包屑...

Answer 1

我刚刚遇到了同样的问题。

当您使用开源“vc4-kms-v3d”驱动程序(在 config.txt 中设置)时，您无法使用闭源驱动程序(/opt/vc/lib/libGLESv2.so 和 /opt/vc/lib/libEGL.so，在您的 LD_PRELOAD 字符串上)。

错误

failed to add service - already in use?

表明这一点，正如我刚刚发现的那样。

因此，您可以在 config.txt 上注释该行，或者不使用 LD_PRELOAD 策略或 QT_QPA_EGLFS_INTEGRATION=eglfs_brcm