vgsp: periodic GLX shared-surface refCount watchdog

The GLX client writes lastKickoffRefCount during init before its first kick,
while the X DDX may already poll gpuRefCount against it; if a previous client
left the count lower the wait can only clear after the GLX request the DDX is
blocking. Once per second (and on a manual sema_gl_shsurf_kick write) walk the
known shared-surface VA and the last decoded release VA, and author the
client's plausible lastKickoffRefCount forward-only. The strict lkr gate
(high dword zero, small, cur < lkr) keeps it a no-op when the VA maps
something else. Gated by sema_gl_shsurf_watch (default on).

0 files changed, 0 insertions, 0 deletions