[Skiboot] [PATCH] npu2: Add performance tuning SCOM inits

[Stewart Smith]

Reza Arbab <arbab at linux.vnet.ibm.com> writes:
> Peer-to-peer GPU bandwidth latency testing has produced some tunable
> values that improve performance. Add them to our device initialization.
>
> File these under things that need to be cleaned up with nice #defines
> for the register names and bitfields when we get time.
>
> A few of the settings are dependent on the system's particular NVLink
> topology, so introduce a helper to determine how many links go to a
> single GPU.
>
> Signed-off-by: Reza Arbab <arbab at linux.vnet.ibm.com>
> ---
>  hw/npu2.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 96 insertions(+), 1 deletion(-)

Merged to master as of 0ce7482fb650f3b2ffd52bbfb1546cdd8aa9117c
and backported into 5.10.x as of 4bf0117894d784a9edea38e4626908838ee228b9

-- 
Stewart Smith
OPAL Architect, IBM.