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!usbkd.usb2

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The !usbkd.usb2 command displays a list of USB endpoints that have USB 2.0 scheduling information.

!usbkd.usb2 DeviceExtension

Parameters

DeviceExtension
Address of the device extension for the functional device object (FDO) of a USB host controller.

DLL

Usbkd.dll

Examples

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

0: kd> !usbkd.usb2tree

EHCI MINIPORT(s) dt usbport!_USBPORT_MINIPORT_DRIVER ffffe00001f48bd0
...
2)!ehci_info ffffe00001ca11a0 !devobj ffffe00001ca1050 PCI: VendorId 8086 DeviceId 293c RevisionId 0002 
...

In the preceding output, the address of the device extension of the FDO is displayed as the argument of the DML command !ehci_info ffffe00001ca11a0. Pass the address of the device extension to the !usb2 command.

0: kd> !usbkd.usb2 ffffe00001ca11a0

Sig: HFDO
Hcd FDO Extension:
----------
----------
dt usbport!_HCD_ENDPOINT ffffe0000212d970  !usbep ffffe0000212d970
    Tt 0000000000000000 Device Address: 0x00, ep 0x81 Interrupt In
    dt _USB2LIB_ENDPOINT_CONTEXT ffffe000023b60f0    dt _USB2_EP ffffe000023b6100
    Period,offset,Ordinal(32,0,0)   smask,cmask(00,00  ........ , ........) maxpkt 1

See also

USB 2.0 Debugger Extensions

Universal Serial Bus (USB) Drivers