The displayed information is based on data structures maintained by the USB 3.0 hub driver. The following extension commands display information about USB 3.0 hubs, devices, and ports. The !usb_tree command displays a list of commands and addresses that you can use to investigate host controllers, hubs, ports, devices, endpoints, and other elements of the USB 3.0 tree. To start debugging a USB 3.0 issue, enter the !usb_tree command. However, when we use the term USB 3.0 tree, we are referring to the set of all USB 3.0 host controllers along with their connected hubs and devices. You can think of the diagram as two trees, one for each host controller. But all of the devices shown (including the hubs) are part of the USB 3.0 tree, because each device is on a branch that originates at a USB 3.0 host controller.

Notice that not every device shown in the diagram is a USB 3.0 device. The tree shown in the diagram has two USB 3.0 host controllers. The following diagram shows an example of a USB 3.0 tree. The USB 3.0 tree contains all USB 3.0 host controllers and all hubs and devices that are connected to USB 3.0 host controllers. The USB 3.0 debugger extension commands are implemented in Usb3kd.dll. For an explanation of the data structures used by the drivers in the USB 3.0 stack, see USB 3.0 Data Structures and Part 2 of the USB Debugging Innovations in Windows 8 video. For more information about these three drivers, see USB host-side drivers in Windows. These commands display information from data structures maintained by three drivers in the USB 3.0 stack: the USB 3.0 hub driver, the USB host controller extension driver, and the USB 3.0 host controller driver. This section describes the USB 3.0 debugger extension commands.

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