Re: [PATCH] PCI: Fix PCIe SBR dev/link wait error

["guanghuifeng@linux.alibaba.com" <guanghuifeng@linux.alibaba.com>]

在 2025/12/1 21:26, Lukas Wunner 写道:
> On Mon, Dec 01, 2025 at 08:56:10PM +0800, guanghuifeng@linux.alibaba.com wrote:
>> 2025/12/1 18:03, Lukas Wunner :
>>> It seems highly unusual that the different functions of the same physical
>>> device require different delays until they're accessible.  I don't think
>>> we can accept such a sweeping change wholesale without more details,
>>> so please share what the topology looks like (lspci -tv), what devices are
>>> involved (lspci -vvv) and which device requires extra wait time for some
>>> of its functions.
> Could you please provide the details I asked for above?
>
> Thanks,
>
> Lukas

Thanks.

1. Currently, there are significant differences in reset recovery times 
among

    some PCIe multifunction devices, especially when the functions and 
complexities

    vary greatly, including some devices used for testing purposes.



2. Furthermore, similar implementations exist in various commercial devices

    (with vastly different functions), such as the multifunction devices

    (including VGA, audio functions, etc.) mentioned in the following link:

https://forums.developer.nvidia.com/t/nvidia-rtx-5090-not-detected-by-nvidia-smi-on-ubuntu-server-24-04/327409?page=2
[from the link]
lspci -nn | grep -i nvidia
c1:00.0 VGA compatible controller [0300]: NVIDIA Corporation GB202 
[GeForce RTX 5090] [10de:2b85] (rev a1)
c1:00.1 Audio device [0403]: NVIDIA Corporation Device [10de:22e8] (rev a1)

[from the link]