Message-ID: <CAB4CAwfeBXzA156hsR0u6bmxXq8NutSq+4iW5fbhrXRx0qSm7Q@mail.gmail.com>
Date:   Wed, 14 Feb 2018 10:44:20 +0800
From:   Chris Chiu <chiu@...lessm.com>
To:     Corey Minyard <minyard@....org>
Cc:     Arnd Bergmann <arnd@...db.de>, gregkh@...uxfoundation.org,
        openipmi-developer@...ts.sourceforge.net,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: ipmi_si fails to get BMC ID

On Fri, Feb 9, 2018 at 9:34 PM, Corey Minyard <minyard@....org> wrote:
> On 02/08/2018 09:09 PM, Chris Chiu wrote:
>>
>> On Thu, Feb 8, 2018 at 11:53 PM, Corey Minyard <minyard@....org> 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
>>>> https://gist.github.com/mschiu77/76888f1fd4eb56aa8959d76759a912bb.
>>>
>>>
>>> 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.
https://www.drivermax.com/Realtek-Virtual-IPMI-Realtek-PCI-VEN-10EC-DEV-816C-1_0_0718_2013-2013-07-18-509795-driver.htm
Then you will see the device (hightlighted) on the control panel as follows
https://pasteboard.co/H7xm3fJ.png

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.
https://pasteboard.co/H7xnhz0.png

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.

Chris

>>> 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
>>>> https://gist.github.com/mschiu77/33f0372be41670d8a69c97e64f833087. 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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