linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Alan Stern <stern@rowland.harvard.edu>
To: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Mathias Nyman <mathias.nyman@intel.com>,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [xhci] usb 4-1: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd
Date: Fri, 5 Mar 2021 11:07:28 -0500	[thread overview]
Message-ID: <20210305160728.GE38200@rowland.harvard.edu> (raw)
In-Reply-To: <CA+icZUVpQtsq8y=rjR3Ad_G1VXWpR4D4xao8DGUkRiuxoT+cPA@mail.gmail.com>

On Fri, Mar 05, 2021 at 01:09:16PM +0100, Sedat Dilek wrote:
> On Mon, Mar 1, 2021 at 4:53 PM Alan Stern <stern@rowland.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?

Don't worry about trying to decode the output.  To me it looks like the 
drive crashes and needs to be reset at times when the computer sends it 
an ATA command.  (Not all ATA commands, but some.)  You can prevent this 
by setting the following module parameter for the usb-storage driver:

	quirks=174c:55aa:t

where the two numbers are the Vendor and Product IDs for the external 
drive, and the 't' is a quirks flag saying not to use any ATA commands.  
If this module parameter fixes the problem, we can add a permanent quirk 
setting to the kernel.

Alan Stern

  reply	other threads:[~2021-03-05 16:08 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-24 13:44 [xhci] usb 4-1: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd Sedat Dilek
2021-02-24 17:25 ` Sedat Dilek
2021-03-01  8:54   ` Sedat Dilek
2021-03-01 15:53     ` Alan Stern
2021-03-05 12:09       ` Sedat Dilek
2021-03-05 16:07         ` Alan Stern [this message]
2021-03-05 19:05           ` Sedat Dilek
2021-03-05 19:22             ` Sedat Dilek
2021-03-05 19:30               ` Alan Stern
2021-03-05 19:41                 ` Sedat Dilek
2021-03-05 19:47                   ` Alan Stern
2021-03-05 19:54                     ` Sedat Dilek
2021-03-06  6:42                       ` Sedat Dilek
2021-03-06 16:58                         ` Alan Stern
2021-03-06 19:30                           ` Sedat Dilek
2021-03-06 20:26                           ` Sedat Dilek
2021-03-06 20:38                             ` Sedat Dilek
2021-03-06 20:49                               ` Sedat Dilek
2021-03-06 20:56                                 ` Sedat Dilek
2021-03-06 21:02                                   ` Sedat Dilek
2021-03-07 15:46                                 ` Alan Stern
2021-03-07 16:57                                   ` Sedat Dilek
2021-03-07 17:07                                     ` Alan Stern
2021-03-12 16:57                                       ` Sedat Dilek
2021-03-12 17:01                                         ` Sedat Dilek
2021-03-12 17:41                                           ` Sedat Dilek
2021-03-12 18:05                                             ` Alan Stern
2021-03-12 18:26                                               ` Sedat Dilek
2021-03-12 21:56                                                 ` Alan Stern
2021-03-05 19:25             ` Alan Stern
2021-03-05 19:37               ` Sedat Dilek

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210305160728.GE38200@rowland.harvard.edu \
    --to=stern@rowland.harvard.edu \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=mathias.nyman@intel.com \
    --cc=sedat.dilek@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).