Passthrough of USB Hub that supports Per Port Power Switching

[gloverde]

I have multiple test fixtures
Each fixture consists of 2 USB devices plugged into a USB hub that supports Per Port Power switching (PPPS).
These USB devices often lock up and require VBUS power to be toggled in order to reset them. Thus the need for Per Port Power switching.
Each fixture is assigned to a proxmox hosted VM and I currently have 3 fixtures (3 hubs) attached to the machine running Proxmox.

My physical machine only has one PCI based USB 3.0 hub.
I need to passthrough each of the individual hubs to their own VM
Or I suppose a less likely solution would be to somehow pass through and enable PPPS functionality to already virtualized hub in the VM?

Can anybody think of a solution?
Again passing through the whole PCI based USB hub is not an option.

 

[leesteken]

Unfortunately, you cannot passthrough whole hubs at once. You need to USB passthrough each port (or device) on each hub separately.

 

[gloverde]

No way at all?
Even if I were willing to get my hands a bit dirty?

 

[leesteken]

No way at all?
Even if I were willing to get my hands a bit dirty?

Maybe you can write the software that makes that work? Otherwise, passthrough each endpoint (USB device ID or port) separately as explained in the Wiki. It's similar to PCIe passthrough, where you can pass separate devices but not whole sub-trees of the PCIe bus.

EDIT: If you can passthrough a USB controller, then you won't have this problem. Maybe add a (known to wotk with passthrough because most don't) USB controller PCIe add-in card?

 

[gloverde]

Unfortunately my infrastructure consists of miniature PC's. No room for PCIe USB expansion.


I can bring the ports in individually but the power switching doesn't work (Pretty much as expected)
Normally I am using https://github.com/mvp/uhubctl to switch the ports.

Output of lsusb on my proxmox host with PPPS hub attached and two usb devices attached to the hub

Bus 001 Device 014: ID 2109:2811 VIA Labs, Inc. Hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0
  bDeviceProtocol         1 Single TT
  bMaxPacketSize0        64
  idVendor           0x2109 VIA Labs, Inc.
  idProduct          0x2811 Hub
  bcdDevice           90.70
  iManufacturer           1 VIA Labs, Inc.         
  iProduct                2 USB2.0 Hub             
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0019
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval              12
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             4
  wHubCharacteristic 0x01e9
    Per-port power switching                                              <<<<<<<<<<NOTE<<<<<<<<<<<<<<<  Per-port power switching
    Per-port overcurrent protection
    TT think time 32 FS bits
    Port indicators
  bPwrOn2PwrGood       50 * 2 milli seconds
  bHubContrCurrent    100 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0503 highspeed power enable connect
   Port 2: 0000.0503 highspeed power enable connect
   Port 3: 0000.0100 power
   Port 4: 0000.0100 power
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength       0x002a
  bNumDeviceCaps          3
  USB 2.0 Extension Device Capability:
    bLength                 7
    bDescriptorType        16
    bDevCapabilityType      2
    bmAttributes   0x00000002
      HIRD Link Power Management (LPM) Supported
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x00
    wSpeedsSupported   0x000e
      Device can operate at Full Speed (12Mbps)
      Device can operate at High Speed (480Mbps)
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   1
      Lowest fully-functional device speed is Full Speed (12Mbps)
    bU1DevExitLat           4 micro seconds
    bU2DevExitLat         231 micro seconds
  Container ID Device Capability:
    bLength                20
    bDescriptorType        16
    bDevCapabilityType      4
    bReserved               0
    ContainerID             {6970202d-1e44-4cde-8f73-78ec5964eca7}
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0001
  Self Powered

Output of lsusb in a VM with the PPPS hub attached and the two usb devices attached to the hub

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            9 Hub
  bDeviceSubClass         0
  bDeviceProtocol         1 Single TT
  bMaxPacketSize0        64
  idVendor           0x1d6b Linux Foundation
  idProduct          0x0002 2.0 root hub
  bcdDevice            5.15
  iManufacturer           3 Linux 5.15.0-71-generic xhci-hcd
  iProduct                2 xHCI Host Controller
  iSerial                 1 0000:02:1b.0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0019
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval              12
Hub Descriptor:
  bLength              11
  bDescriptorType      41
  nNbrPorts            15
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)              <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<NOTE<<<<<<<<<< NO POWER SWITCHING
    Per-port overcurrent protection
    TT think time 8 FS bits
  bPwrOn2PwrGood       10 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00 0x00
  PortPwrCtrlMask    0xff 0xff
 Hub Port Status:
   Port 1: 0000.0503 highspeed power enable connect
   Port 2: 0000.0503 highspeed power enable connect
   Port 3: 0000.0100 power
   Port 4: 0000.0100 power
   Port 5: 0000.0100 power
   Port 6: 0000.0100 power
   Port 7: 0000.0100 power
   Port 8: 0000.0100 power
   Port 9: 0000.0100 power
   Port 10: 0000.0100 power
   Port 11: 0000.0100 power
   Port 12: 0000.0100 power
   Port 13: 0000.0100 power
   Port 14: 0000.0100 power
   Port 15: 0000.0100 power
Device Status:     0x0001
  Self Powered