[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

Hi Cedric,

On 09/27/2016 08:47 PM, C├ędric Le Goater wrote:
> Hello  Shilpa, 
> On 09/13/2016 04:50 PM, Shilpasri G Bhat wrote:
>> Hi,
>> 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 : 
> 	https://github.com/shilpasri/occ/commit/c896767a64e22619b274bcfb0290e42bab6e3a14

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 :
> 	https://github.com/legoater/skiboot/commit/2b3f76c9d751ddd21d158fc91ef5065139afd02e

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,

> Cheers,
> C.

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