netdev - Re: [Intel-wired-lan] [PATCH net v3] net: ethtool: do runtime PM outside RTNL

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Date: Mon, 25 Dec 2023 10:03:23 +0200
From: Sasha Neftin <sasha.neftin@...el.com>
To: Heiner Kallweit <hkallweit1@...il.com>, Marc MERLIN <marc@...lins.org>
CC: Jakub Kicinski <kuba@...nel.org>, Johannes Berg
	<johannes@...solutions.net>, <netdev@...r.kernel.org>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH net v3] net: ethtool: do runtime PM
 outside RTNL

On 25/12/2023 1:12, Heiner Kallweit wrote:
> On 24.12.2023 17:30, Marc MERLIN wrote:
>> On Fri, Dec 15, 2023 at 09:46:34AM -0800, Marc MERLIN wrote:
>>> On Fri, Dec 15, 2023 at 02:42:01PM +0100, Heiner Kallweit wrote:
>>>> Why don't you simply disable runtime pm for the affected device as a
>>>> workaround? This can be done via sysfs.
>>>
>>> 1) because I didn't know what the exact bug was and how to work around it :)
>>
>> Mmmh, so I need to test an ubuntu kernel (6.5.0-14) because of sound
>> issues in mainline TOT, and I can't boot the kernel to completion
>> without hititng this hang bug. I'm not exactly sure which part of the
>> boot triggers it.
>>
>> I can't patch that kernel easily. How exactly do I disable runtime PM
>> from the kernel command line for "that device" which I'm not even sure
> 
> Change <device>/power/control from "auto" to "on".

Need to figure out your controller location in a file system via 
lspci/lspci -t and then change to "on"
For example: echo on > 
/sys/devices/pci0000\:00/0000\:00\:1c.0/0000\:ae\:00.0/power/control

We are starting to look at this problem, but I can't reproduce the 
problem on my machines yet.

> 
>> which one it is.  If it's the eth device, I already removed the igc
>> module to prevent it from loading, and I also removed the ethtool
>> binary, but I'm still getting the hang.
>>
>> On the plus side, with 6.6.8 and the old patch which I understand is not
>> the ideal solution, I can confirm that I've been running problem free
>> until now, so thanks again for that interim patch.
>>
>> Thanks,
>> Marc
> 
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> Intel-wired-lan@...osl.org
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