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Drivers USB EN
Z User edited this page Oct 23, 2026
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Language: English ｜ Drivers-USB
| Stack | QEMU | Notes |
|---|---|---|
| UHCI | -device usb-uhci |
frame lists, TD retirement shared code |
| OHCI | -device usb-ohci |
ED/TD pools, 7-bit toggle table |
| EHCI | -device usb-ehci |
async + periodic schedules, IAA unlink |
| xHCI | -device qemu-xhci |
rings with LINK cycle, scratchpad, 64-bar high-word |
| Class | QEMU device | Command | Test |
|---|---|---|---|
| MSC storage | -device usb-storage |
usb, usbdev
|
usb_storage_test |
| HID keyboard | -device usb-kbd |
(feeds input queue) | usb_kbd_test |
| HID mouse | -device usb-mouse |
(pointer) | usb_mouse_test |
| Serial | -device usb-serial |
usbdev |
usb_serial_test |
| Audio | -device usb-audio |
usbaudio |
usb_audio_test |
| Hub | -device usb-hub |
usb |
usb_hub_test |
usb_hotplug_test covers attach/detach handling.
-
usblists controllers + devices; enumeration depth reaches USB_ENUM_DEPTH through hubs. - The class driver binds (MSC registers a block device; HID feeds the input queues; serial creates a port).
- The family test command is the gate (
usb_storage_test5/5 etc.).
- xHCI DMA above 4 GiB: refused at probe + per-transfer.
- C_PORT_RESET wait with timeout; hub speed decode; recursive enumeration bounds.
- MSC: SENSE inside one busy window (the never-sends-sense bug), per-instance names usda/usdb.
- ISO audio endpoints zero-pad tails (no OOB reads).