!usbkd.usbhcdlog
The !usbkd.usbhcdlog command displays a portion of the debug log for a USB host controller.
!usbkd.usbhcdlog DeviceExtension[, NumberOfEntries]
Parameters
DeviceExtension
Address of the device extension for the functional device object (FDO) of a UHCI or EHCI USB host controller.
NumberOfEntries
The number of log entries to display. To display the entire log, set this parameter to -1.
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.
Now pass the address of the device extension to the !usbhcdlog command. In this example, the second argument limits the display to four log entries.
0: kd> !usbkd.usbhcdlog ffffe00001ca11a0, 4
LOG@: ffffe00001ca11b8
>LOG mask = 3ff idx = fff68e95 (295)
*LOG: ffffe000020192a0 LOGSTART: ffffe00002014000 *LOGEND: ffffe0000201bfe0 # 4
[ 000] ffffe000020192a0 xSt0 ffffe00001ca1b88 0000000000000006 0000000000000001
[ 001] ffffe000020192c0 xnd8 ffffe00001ca1b88 ffffe00001ca1050 0000000000000000
[ 002] ffffe000020192e0 xnd0 ffffe00001ca1b88 ffffe00001ca1050 0000000000000000
[ 003] ffffe00002019300 gNX0 0000000000000000 0000000000000000 ffffe00001ca1b88