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Subject: Re: 5.10 regression, many XHCI swiotlb buffer is full / DMAR: Device
 bounce map failed errors on thunderbolt connected XHCI controller
From:   Hans de Goede <hdegoede@redhat.com>
To:     Mathias Nyman <mathias.nyman@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Christoph Hellwig <hch@lst.de>
Cc:     linux-usb <linux-usb@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-pci@vger.kernel.org
References: <b046dd04-ac4f-3c69-0602-af810fb1b365@redhat.com>
Message-ID: <be031d15-201f-0e5c-8b0f-be030077141f@redhat.com>
Date:   Mon, 23 Nov 2020 15:49:09 +0100
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Hi,

+Cc Christoph Hellwig <hch@lst.de>

Christoph, this is still an issue, so I've been looking around a bit and think this
might have something to do with the dma-mapping-5.10 changes.

Do you have any suggestions to debug this, or is it time to do a git bisect
on this before 5.10 ships with regression?

Regards,

Hans


On 11/10/20 12:36 PM, Hans de Goede wrote:
> Hi All,
> 
> Not sure if this is a XHCI driver problem at all, but I needed to start
> somewhere with reporting this so I went with:
> 
> scripts/get_maintainer.pl -f drivers/usb/host/xhci-pci.c
> 
> And added a Cc: linux-pci@vger.kernel.org as bonus.
> 
> I'm seeing the following errors and very slow network performance with
> the USB NIC in a Lenovo Thunderbolt gen 2 dock.
> 
> Note that the USB NIC is connected to the XHCI controller which is
> embedded inside the dock and is connected over thunderbolt!
> 
> So the errors are:
> 
> [ 1148.744205] swiotlb_tbl_map_single: 6 callbacks suppressed
> [ 1148.744210] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
> [ 1148.744218] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 16ea@1411c0000 dir 1 --- failed
> [ 1148.744226] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
> [ 1148.744368] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
> [ 1148.744375] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 16ea@10aabc000 dir 1 --- failed
> [ 1148.744381] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
> [ 1148.745141] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
> [ 1148.745148] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 118e@1411c0000 dir 1 --- failed
> [ 1148.745155] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
> [ 1148.951282] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
> [ 1148.951388] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 118e@140988000 dir 1 --- failed
> [ 1148.951420] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
> [ 1151.013342] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
> [ 1151.013357] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 1d2a@1411c0000 dir 1 --- failed
> [ 1151.013373] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
> [ 1151.018660] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 18 (slots)
> [ 1151.018696] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 11da@1411c0000 dir 1 --- failed
> [ 1151.018711] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
> [ 1151.223022] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
> [ 1151.223102] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 11da@10aabc000 dir 1 --- failed
> [ 1151.223133] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
> [ 1151.228810] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
> [ 1151.228870] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 11da@10aabc000 dir 1 --- failed
> [ 1151.228898] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
> [ 1151.234792] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
> [ 1151.234852] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 11da@10aabc000 dir 1 --- failed
> [ 1151.234882] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
> 
> etc.
> 
> This happens as soon as I generate any serious amount of outgoing network traffic. E.g. rsyncing files
> to another machine.
> 
> Regards,
> 
> Hans
>