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SubjectRe: ipmi_si fails to get BMC ID
On Fri, Feb 9, 2018 at 9:34 PM, Corey Minyard <> wrote:
> On 02/08/2018 09:09 PM, Chris Chiu wrote:
>> On Thu, Feb 8, 2018 at 11:53 PM, Corey Minyard <> wrote:
>>> On 02/07/2018 09:01 PM, Chris Chiu wrote:
>>>> Hi,
>>>> We are working with a new desktop Acer Veriton Z4640G and get
>>>> stumbled on failing to enter S3 suspend with kernel version 4.14 even
>>>> the latest 4.15+. Here's the kernel log
>>> This is a little strange, nobody had reported this before. Can you
>>> reproduce this
>>> at will, or was it a one-time thing?
>> It can be reproduced on each reboot.
>>> Does the IPMI driver always take this long to issue that error, even if
>>> you
>>> are not
>>> entering sleep state?
>> Yep, it will always print "ipmi_si 0000:02:00.3: There appears to be
>> no BMC at this
>> location" few minutes after boot.
>>> And it started with 4.14, and didn't occur before then, right?
>> I haven't try pre-4.14 kernel. Will do that and update here.
> Ah. It's probably still worth trying, but I doubt it will make any
> difference.
> Are you sure there is actually an IPMI BMC installed in this system? It
> might
> be a plug-in card that is not installed, but the interface still appears on
> the
> PCI bus. So there is enough hardware to go part-way through the motions
> of being an IPMI interface, but not enough to actually work.
> If there is a BMC there, do you know the register layout? The IPMI spec has
> an algorithm to go through to discover some of the parameters, and the
> driver follows it, but IMHO it's not really very good. I'll need to know
> the
> size of the registers, and the spacing between the registers.
> -corey

Sorry for late response because it's close to Chinese New Year.
I can get the IPMI working with the driver here on Windows.
Then you will see the device (hightlighted) on the control panel as follows

I don't know how to get the register layout you need. I can only take a
picture of the content of the PCI resources.

The contents of BAR1, BAR3, BAR5 are all 0xff. Can you point me out
where the useful information might be and I can try to dump FYI.


>>> There's a bug in the PCI utils database, I submitted a report a while
>>> ago.
>>> This is
>>> a KCS, not a SMIC interface.
>>> It looks like the driver is trying to detect that there is a device out
>>> there and
>>> there is something that kind of works, but doesn't work completely. The
>>> interface
>>> specific code was all split out into separate files in 4.14. It is
>>> possible
>>> the
>>> detection code got messed up in the process. Nothing jumps out looking
>>> at
>>> the code differences, and I know it works on some PCI machines.
>>> Assuming this is reproducible, can you send the the output of a pre-4.14
>>> kernel? If that doesn't make it obvious I may have to have access to the
>>> machine itself.
>>> -corey
>> It's an All-in-One machine so I think it would be difficult for
>> shipment. I'll see what
>> I can do. Thanks for help.
>> Chris
>>>> As you see, it is due to "ipmi_probe+0x430/0x430 [ipmi_si]". After
>>>> the message "ipmi_si 0000:02:00.3: There appears to be no BMC at this
>>>> location" shows up, then it can really go to suspend w/o problem.
>>>> Although it took around 3 mins. The IPMI device is probed from PCI and
>>>> here's the output of lspci
>>>> The
>>>> IPMI device is "02:00.3 IPMI SMIC interface [0c07]". We get stuck here
>>>> because we don't really know why it took so long in try_get_dev_id() /
>>>> ipmi_si_intf.c. Any suggestion about this to help us moving forward?
>>>> Thanks
>>>> Chris

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