All of lore.kernel.org
 help / color / mirror / Atom feed
From: Greg KH <gregkh@linuxfoundation.org>
To: John Donnelly <john.p.donnelly@oracle.com>
Cc: linux-usb@vger.kernel.org
Subject: Re: ehci-pci :   WARNING: CPU: 0 PID: 347 at kernel/dma/direct.c:34
Date: Sat, 28 Mar 2020 08:08:53 +0100	[thread overview]
Message-ID: <20200328070853.GA3643170@kroah.com> (raw)
In-Reply-To: <F5A0CCCB-4503-40B1-A24D-323F5B89C1F4@oracle.com>

On Fri, Mar 27, 2020 at 11:11:33PM -0500, John Donnelly wrote:
> 
> Hi,
> 
> I am seeing this WARNING  event with iommu=off when booting a DL380 server with a  5.4.17 kernel.
> 
> 
> 
> [    7.292703] ehci-pci 0000:00:1a.0: swiotlb buffer is full (sz: 8 bytes), total 0 (slots), used 0 (slots)
> [    7.309834] ehci-pci 0000:00:1a.0: overflow 0x0000000a1c8f9a60+8 of DMA mask ffffffff bus limit 0
> [    7.325937] ------------[ cut here ]------------

So your system really wants the iommu enabled, I would stick with doing
that :)

thanks,

greg k-h

  reply	other threads:[~2020-03-28  7:09 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-28  4:11 ehci-pci : WARNING: CPU: 0 PID: 347 at kernel/dma/direct.c:34 John Donnelly
2020-03-28  7:08 ` Greg KH [this message]
2020-03-28 15:34 ` Alan Stern
2020-03-28 15:37 ` Alan Stern
2020-03-28 18:05   ` John Donnelly
2020-03-30 18:36   ` John Donnelly
2020-03-30 19:41     ` Alan Stern
2020-03-30 20:11       ` John Donnelly
2020-03-31  2:10         ` John Donnelly
2020-03-31 14:17           ` Alan Stern
2020-03-31 16:07             ` John Donnelly
2020-03-31 17:43               ` John Donnelly
2020-03-31 18:21                 ` Alan Stern
2020-04-07 13:49             ` John Donnelly
2020-04-07 13:53               ` Alan Stern

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=20200328070853.GA3643170@kroah.com \
    --to=gregkh@linuxfoundation.org \
    --cc=john.p.donnelly@oracle.com \
    --cc=linux-usb@vger.kernel.org \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.