Access Intel ME IPMB from BMC

[Oskar Senft]

On a side note regarding the ipmb-dev driver: It seems that the
Documentation/IPMB.txt has gotten "lost". The only version I could find is
this:
https://github.com/openbmc/linux/blob/51bd6f291583684f495ea498984dfc22049d7fd2/Documentation/IPMB.txt.
But it's not in any of the recent branches (dev-5.3 or dev-5.4).

Should this file be resurrected?

Oskar.

On Thu, Apr 23, 2020 at 11:31 AM Oskar Senft <osk at google.com> wrote:

> Thanks again!
>
> ipmbbridge solved my problem. I found that my version of OpenBMC (incl.
> kernel) used a slightly older version of ipmbbridge which still used the
> i2c slave mqueue, which worked fine. Reading a bit of source code made it
> clear how it worked. The key is to configure ipbm-channels.json with the
> correct i2c device and the rest "just works".
>
> For the benefit of others: My understanding is that the current version of
> ipmbbridge no longer uses the i2c slave mqueue but requires the ipmb-dev
> driver in the kernel. It's not necessary to actually attach the driver to
> an i2c device as that can happen at runtime.
>
> Oskar.
>
>
> On Mon, Apr 20, 2020 at 4:34 PM Vijay Khemka <vijaykhemka at fb.com> wrote:
>
>> Hi Oskar,
>>
>> You need to use ipmb-dev driver which is is being used by ipmbbridge. You
>> don’t need ipmb-host as we are having ipmbbridge to replace that.
>>
>>
>>
>> Regards
>>
>> -Vijay
>>
>>
>>
>> *From: *Oskar Senft <osk at google.com>
>> *Date: *Monday, April 20, 2020 at 11:35 AM
>> *To: *Vijay Khemka <vijaykhemka at fb.com>
>> *Cc: *OpenBMC Maillist <openbmc at lists.ozlabs.org>
>> *Subject: *Re: Access Intel ME IPMB from BMC
>>
>>
>>
>> Hi Vijay
>>
>>
>>
>> Thanks for the pointer!
>>
>>
>>
>> I also found both https://github.com/Mellanox/ipmb-host and
>> https://github.com/openbmc/linux/blob/dev-5.4/drivers/char/ipmi/ipmb_dev_int.c
>> .
>>
>>
>>
>> Is it right that with ipmbbridge I don't need either of them since
>> ipmbbridge uses the raw i2c dev?
>>
>>
>>
>> Thanks
>>
>> Oskar.
>>
>>
>>
>> On Mon, Apr 20, 2020 at 2:12 PM Vijay Khemka <vijaykhemka at fb.com> wrote:
>>
>> Hi Oskar,
>>
>> You need to configure your ME channel in ipmb channel config file
>> https://github.com/openbmc/ipmbbridge/blob/master/ipmb-channels.json
>>
>> And make sure ipmbbridge is running. Then you can send get device id
>> command to ME from command line itself to test if everything is working.
>>
>>
>>
>> busctl call xyz.openbmc_project.Ipmi.Channel.Ipmb
>> /xyz/openbmc_project/Ipmi/Channel/Ipmb org.openbmc.Ipmb sendRequest yyyyay
>> 1 6 0 0x1 0
>>
>>
>>
>> Regards
>>
>> -Vijay
>>
>>
>>
>> *From: *openbmc <openbmc-bounces+vijaykhemka=fb.com at lists.ozlabs.org> on
>> behalf of Oskar Senft <osk at google.com>
>> *Date: *Saturday, April 18, 2020 at 6:47 PM
>> *To: *OpenBMC Maillist <openbmc at lists.ozlabs.org>
>> *Subject: *Access Intel ME IPMB from BMC
>>
>>
>>
>> Hi everyone
>>
>>
>>
>> I'm trying to find out how I can access the Intel ME via IPMB from the
>> BMC (OpenBMC).
>>
>>
>>
>> From what I gathered, Intel ME's IPMB is on the PCH's SMLink0. I know
>> this is connected to one of the SMBus modules on my AST2500. But what I
>> can't find out is how I actually send commands there? I'm sure I'm missing
>> a document that makes this obvious.
>>
>>
>>
>> Or is it as simple as dropping IPMI packets onto the bus?
>>
>>
>>
>> Is this by any chance already implemented in OpenBMC?
>>
>>
>>
>> Thanks for any hints!
>>
>>
>>
>> Oskar
>>
>>
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