linux-kernel - Re: [xhci] usb 4-1: reset SuperSpeed Gen 1 USB device number 2 using xhci

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Date:   Fri, 5 Mar 2021 13:09:16 +0100
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Mathias Nyman <mathias.nyman@...el.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [xhci] usb 4-1: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd

On Mon, Mar 1, 2021 at 4:53 PM Alan Stern <stern@...land.harvard.edu> wrote:
[ ... ]
> You can use usbmon on bus 4 to record the USB traffic.  It may indicate
> why the resets occur.
>

Hi Alan,

I followed the instructions in [1].

root# modprobe -v usbmon

root# ls /sys/kernel/debug/usb/usbmon
0s  0u  1s  1t  1u  2s  2t  2u  3s  3t  3u  4s  4t  4u

root# cat /sys/kernel/debug/usb/usbmon/4u > /tmp/usbmon-log_4u.txt
[ Ctrl+C ]

I recorded 13:03 - 13:04 (one minute).

So these xhci-resets should be included:

[Fri Mar  5 13:03:07 2021] usb 4-1: reset SuperSpeed Gen 1 USB device
number 2 using xhci_hcd
[Fri Mar  5 13:03:07 2021] usb 4-1: reset SuperSpeed Gen 1 USB device
number 2 using xhci_hcd
[Fri Mar  5 13:03:27 2021] usb 4-1: reset SuperSpeed Gen 1 USB device
number 2 using xhci_hcd
[Fri Mar  5 13:03:27 2021] usb 4-1: reset SuperSpeed Gen 1 USB device
number 2 using xhci_hcd
[Fri Mar  5 13:03:27 2021] usb 4-1: reset SuperSpeed Gen 1 USB device
number 2 using xhci_hcd
[Fri Mar  5 13:03:28 2021] usb 4-1: reset SuperSpeed Gen 1 USB device
number 2 using xhci_hcd
[Fri Mar  5 13:03:28 2021] usb 4-1: reset SuperSpeed Gen 1 USB device
number 2 using xhci_hcd

The usbmon-log is attached.

Unsure how to interpret the log - the kernel-doc says `raw data`.
How can I bring this into a human-readable format?
Can you give me a hand?

Regards,
- Sedat -

[1] https://www.kernel.org/doc/Documentation/usb/usbmon.

View attachment "usbmon-log_4u.txt" of type "text/plain" (165825 bytes)