[Dri-devel] DRI w/o GL

[khellman]

Hello all:
I'm working on incorporating a Geode accelerated driver into a LC
build. During the process, I've weaseled our X11 (4.2.1) build down a
fair bit - in part by removing GL support.
My final defect is that a multithreaded application displaying 4
distinct changing images in a quad screen seems to be incurring race
conditions in the graphics pipeline. Somehow I need to implement
locking in the Geode DDX driver. When I started looking around, it
seems that DRI/DRM is the established way to do this - here are my
questions or concerns:
- We don't need GL support, and I would rather keep it out of our X
server for space reasons. Is it possible to use DRI/DRM locking
without GL support compiled in? I did not see an X build flag in
config/cf for this feature.
- The documentation states that each hardware component supported
requires a kernel module, gl/mesa module, and an XAA module. I have
none of these (the DDX driver doesn't even have a geode_dri.c file).
Is it feasible to implement a simple (locking only) kernel module, a
lobotomized GL module, and incorporate a geode_dri.c in a short period
of time? If the architecture would support this, how many LOC would
you estimate? I realize that if my first question is negative, this
point is moot.
My alternative to implementing limited DRI support is to simply hardcode
the locking into the Geode DDX driver (thank goodness for open source).
My first thought was to have a kernel module lock held during
accelerated routines; the design of the DDX seems to lend itself to
this; each OP has a SetupOP() and a DoOP() routine. The km lock would
be held accross these two calls, other requests would stall in a wait
queue.
Reading through the documentation and reviewing some debugging results
makes me second guess this solution. Would this type of locking stall
the Xserver when it went into the wait queue?
I'm still diggin' round in the source & documentation; but I felt I had
enough info to post these questions.
TIA & please cross followup to [EMAIL PROTECTED]
--
Keith Hellman
Software Engineer
[EMAIL PROTECTED]
Voice: 303.477.7757


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