[Intel-gfx] [PATCH] drmmode: unreserve userspace fences

[Eric Anholt]

On Thu, 14 Jan 2010 10:13:30 +0100, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> With drmmode, the kernel should control all fence regs. Fence
> starved i8xx with tiled glyph caches actually managed to max out the
> 5 fences available by default: 1 target, 4 glyph cache bos + one
> used by kms modeset for scanout.

Hmm.  KMS support and fence management both came in 2.6.29.  At that
point, did the userland code still write fence regs for KMS
framebuffers?  It would be nice for KMS to assume the correct number of
userland fence regs (0) instead of the old UMS compat number (3),
instead of new userland having to explicitly say that it's not broken.
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