[Differential] [Request, 22 lines] D3127: [platformx/x11] Add a freeze protection against OpenGL

[graesslin (Martin Gräßlin)]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  With nouveau driver it can happen that KWin gets frozen when first trying
  to render with OpenGL. This results in a freeze of the complete desktop
  as the compositor is non functional.
  
  Our OpenGL breakage detection is only able to detect crashes, but not
  freezes. This change improves it by also added a freeze protection.
  
  In the PreInit stage a thread is started with a QTimer of 15 sec. If the
  timer fires, qFatal is triggered to terminate KWin. This can only happen
  if the creation of the OpenGL compositor takes longer than said 15 sec.
  
  In the PostInit stage the timer gets deleted and the thread stopeed
  again.
  
  Thus if a freeze is detected the OpenGL unsafe protection is written into
  the config. KWin aborts and gets restarted by DrKonqui. The new KWin
  instance will no longer try to activate the freezing OpenGL as the
  protection is set.
  
  If KWin doesn't freeze the protection is removed from the config as
  we are used to.

REPOSITORY
  rKWIN KWin

BRANCH
  opengl-freeze-protection-5.8

REVISION DETAIL
  https://phabricator.kde.org/D3127

AFFECTED FILES
  plugins/platforms/x11/standalone/x11_platform.cpp
  plugins/platforms/x11/standalone/x11_platform.h

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: graesslin, #kwin, #plasma
Cc: plasma-devel, kwin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas
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