[Skiboot] [RFC PATCH 0/3] Support for parsing pstate table version 0x90
Shilpasri G Bhat
shilpa.bhat at linux.vnet.ibm.com
Wed Sep 28 03:45:47 AEST 2016
On 09/27/2016 08:47 PM, Cédric Le Goater wrote:
> Hello Shilpa,
> On 09/13/2016 04:50 PM, Shilpasri G Bhat wrote:
>> This series provides support for parsing the new pstate table layout
>> of OCC_OPAL shared memory region for P9.
> This is a little off topic but I was wondering what conclusion you
> have reached with these experimental patches you worked on :
The above changes to OCC did not make it to P8, as it hogged up OCC cycles while
copying the sensors to main memory which affected the real-timeness of OCC.
[Although we could offload the copying to one of the PORE]
In P9, OCC will be copying the sensors to main memory.
> With a very minimal extension in skiboot, the information is made
> available to the linux kernel through the ibmpowernv module. Here
> is another experimental patch doing that :
Thanks for trying this out. This looks very clean. I am trying to do something
very similar for exporting P9 inband OCC sensors except have kernel
dereferencing the sensor pointer than opal. I will post out a RFC soon.
Thanks and Regards,
More information about the Skiboot