[Nouveau] nv50: conditional rendering

[Christoph Bumiller]

The libdrm patch adds functions for unrestricted access to
the notifier area, the second adds conditional rendering:

In order to make the GPU wait for an occlusion query to return
its result, I want to use semaphores (following the example),
but they only work if you use a DMA object + a small offset
(using a RELOC on a query buffer didn't work, FIFO interrupt
(1 << 20)).

The only bo we have a DMA object for is the notifier, so I
thought we could just direct queries to that area, since it
isn't used anway.

Now if the state tracker wants to read the result, I can't
do waiting anymore by mapping a bo (since I didn't reloc one),
and thus I have to busy wait on the notifier area, which isn't
necessarily optimal ...

Any suggestions ?
Christoph
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