sema: fix GR counter-slot mapping to fixed pool total (20)

The counter slot for GR rank r is 0x20400fec0 + (TOTAL-1-r)*0x10 with
TOTAL the fixed pool total. The autoreg used a live high-water channel
count instead; channels register progressively, so an early pass with a
partial count (16) registered the ranks present at the wrong slots and
every later rank's correct slot was then rejected as owned. Result:
ranks 10..19 never got a counter, no counter was ever published, and the
client's userspace tracker never advanced (cudaMalloc stall while the
guest RM polled MC_SERVICE_INTERRUPTS).

Validated on a live boot: 20/20 slots registered with 0 collisions
(previously ranks 6..9 installed at the n_gr=16 mapping and ranks 10..19
rejected).

0 files changed, 0 insertions, 0 deletions