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!usbkd.usbhcdpnp

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The !usbkd.usbhcdpnp command displays the Plug and Play (PnP) state history for a USB host controller or root hub.

!usbkd.usbhcdpnp DeviceExtension

Parameters

DeviceExtension
Address of one of the following:

  • The device extension for the functional device object (FDO) of a USB host controller.
  • The device extension for the physical device object (PDO) a USB root hub.

DLL

Usbkd.dll

Examples

Here is one way to find the address of the device extension for the FDO of USB host controller. First enter !usbkd.usb2tree.

0: kd> !usbkd.usb2tree

UHCI MINIPORT(s) dt usbport!_USBPORT_MINIPORT_DRIVER ffffe0000090c3d0
...
4)!uhci_info ffffe00001c8f1a0 !devobj ffffe00001c8f050 PCI: VendorId 8086 DeviceId 2938 RevisionId 0002 
...

In the preceding output, the address of the device extension of the FDO is displayed as the argument of the DML command !uhci_info ffffe00001c8f1a0.

Now pass the address of the device extension to the !usbhcdpnp command.

0: kd> !usbkd.usbhcdpnp ffffe00001c8f1a0

## PNP STATE LOG (latest at bottom)

##      EVENT                         STATE               NEXT

[01] EvFDO_IRP_MN_START_DEVICE      PnpNotStarted       PnpStarted          
[02] EvFDO_IRP_MN_QBR_RH            PnpStarted          PnpStarted

Here is one way to find the address of the device extension for the PDO of a root hub. First enter !usbkd.usb2tree.

4)!uhci_info ffffe00001c8f1a0 !devobj ffffe00001c8f050 PCI: VendorId 8086 DeviceId 2938 RevisionId 0002 
    RootHub !hub2_info ffffe00000d941a0 !devstack ffffe00000d94050

In the preceding output, you can see the address of the FDO of the root hub displayed as the argument to the command !devstack ffffe00000d94050. Use the !devstack command to find the address of the PDO and the PDO device extension.

0: kd> !kdexts.devstack ffffe00000d94050
  !DevObj           !DrvObj            !DevExt           ObjectName
> ffffe00000d94050  \Driver\usbhub     ffffe00000d941a0  0000006b
  ffffe00000ed4050  \Driver\usbuhci    ffffe00000ed41a0  USBPDO-2

In the preceding output, you can see that the address of the device extension for the PDO of the root hub is ffffe00000ed41a0.

Now pass the address of the device extension to the !usbhcdpnp command.

0: kd> !usbkd.usbhcdpnp ffffe00000ed41a0

## PNP STATE LOG (latest at bottom)

##      EVENT                         STATE               NEXT

[01] EvPDO_IRP_MN_START_DEVICE      PnpNotStarted       PnpStarted

See also

USB 2.0 Debugger Extensions

Universal Serial Bus (USB) Drivers