Re: Kernel moving to Linux v5.10, dropping PECI

[Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>]

On 2/10/2021 5:40 AM, Andrei Kartashev wrote:
> On Wed, 2021-02-10 at 12:43 +0000, Joel Stanley wrote:
>> The openbmc kernel will move to a 5.10 based tree for Aspeed and
>> Nuoton machines.
>>
>>      linux-openbmc: Move to Linux 5.10
>>
>>      This moves the OpenBMC kernel to a v5.10 base for both Aspeed and
>>      Nuvoton. There are 125 patches in the tree, with 80 of those
>> patches not
>>      yet queued for merging in v5.11.
>>
>>      Notably the PECI patchset has been dropped as the author, Intel,
>> has
>>      elected to develop it out of tree instead of submitting it for
>> mainline
>>      inclusion.
>>
>>      https://gerrit.openbmc-project.xyz/c/openbmc/openbmc/+/40404
>>
>> Regarding the PECI situation, I raised it on the list back in August.
>> The conversation finished up in October with a commitment that the
>> work would be done as soon as possible.
>>
>> This kernel config option is enabled by machines from Facebook,
>> Bytedance, HPE, Lenovo, Quanta and Supermicro. (Surprisingly Intel
>> doesn't enable it on their platform?). It would be great for someone
>> from one of those teams to step up and submit the PECI patchset
>> upstream.
> 
> Intel enable PECI in their downstream port
> https://github.com/Intel-BMC/openbmc , where they do have downstream
> fork of the kernel with PECI patches:
> https://github.com/Intel-BMC/linux
> We used to branch from the fork for our x86 platform, so now it's
> really tricky for us to follow upstream. We will very appropriate if
> one will push PECI patches upstream, but this is still Intel's code
> under development and this sounds a bit risky if someone but Intel do
> upstreaming.
> So I'd like first to see Intel's position about not to upstream the
> patches: what is the problem there?
> 

Intel will continue trying to upstreaming the PECI subsystem
implementation but the next spin isn't prepared completely yet.
Meanwhile, the patch set will be provided through the
https://github.com/Intel-BMC/linux fork and it will move to 5.10
soon as well with rebasing the PECI patch set.

Thanks,
Jae

>>
>> In the meantime these in-tree systems will regress their PECI support
>> until the patchset is submitted to mainline.
>>
>> Cheers,
>>
>> Joel