interspersed IOMMU messages in skylake output #60

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1. kent-mcleod commented on Dec 7, 2021

   

   kent-mcleod

   on Dec 7, 2021

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   According to a lspci under linux:

   00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31)
   

   Some USB device is trying to perform DMA writes once seL4 starts it seems. Does that machine have any USB devices attached to it that the other haswell machines don't?
2. kent-mcleod commented on Dec 7, 2021

   

   kent-mcleod

   on Dec 7, 2021

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   All of the usb devices go through that USB controller:

   $ lsusb
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 006: ID 06cb:0009 Synaptics, Inc. Composite TouchPad and TrackPoint
   Bus 001 Device 005: ID 04b3:3018 IBM Corp. UltraNav Keyboard
   Bus 001 Device 003: ID 04b3:3016 IBM Corp. UltraNav Keyboard Hub
   Bus 001 Device 004: ID 413c:2002 Dell Computer Corp. SK-8125 Keyboard
   Bus 001 Device 002: ID 413c:1002 Dell Computer Corp. Keyboard Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   

   $ ls -alh /sys/bus/usb/devices/
   total 0
   drwxr-xr-x 2 root root 0 Dec  7 11:35 .
   drwxr-xr-x 4 root root 0 Dec  7 11:26 ..
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-0:1.0 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-0:1.0
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-3 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-3
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-3.1 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3.1
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-3:1.0 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-3.1:1.0 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3.1/1-3.1:1.0
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-3.1:1.1 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3.1/1-3.1:1.1
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-5 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-5
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-5:1.0 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-5.3 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-5.3:1.0 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3:1.0
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-5.3:1.1 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3:1.1
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-5.4 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.4
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-5.4:1.0 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.4/1-5.4:1.0
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 1-5.4:1.1 -> ../../../devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.4/1-5.4:1.1
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 2-0:1.0 -> ../../../devices/pci0000:00/0000:00:14.0/usb2/2-0:1.0
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 usb1 -> ../../../devices/pci0000:00/0000:00:14.0/usb1
   lrwxrwxrwx 1 root root 0 Dec  7 11:26 usb2 -> ../../../devices/pci0000:00/0000:00:14.0/usb2
   
3. lsf37 commented on Dec 7, 2021

   

   lsf37

   on Dec 7, 2021

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   @wom-bat do you know if skylake has any USB devices attached that would be causing this?
4. lsf37 commented on Dec 7, 2021

   

   lsf37

   on Dec 7, 2021

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   Peter says it might be the keyboard/mouse that is plugged in.