kernel/include/linux/usb/xhci-sideband.h, branch linux-6.17.y

usb: host: xhci: Notify xHCI sideband on transfer ring free

2025-04-11T11:02:30Z

In the case of handling a USB bus reset, the xhci_discover_or_reset_device can run without first notifying the xHCI sideband client driver to stop or prevent the use of the transfer ring. It was seen that when a bus reset situation happened, the USB offload driver was attempting to fetch the xHCI transfer ring information, which was already freed. Tested-by: Puma Hsu Tested-by: Daehwan Jung Signed-off-by: Wesley Cheng Acked-by: Mark Brown Link: https://lore.kernel.org/r/20250409194804.3773260-6-quic_wcheng@quicinc.com Signed-off-by: Greg Kroah-Hartman

usb: host: xhci-mem: Allow for interrupter clients to choose specific index

2025-04-11T11:02:29Z

Some clients may operate only on a specific XHCI interrupter instance. Allow for the associated class driver to request for the interrupter that it requires. Tested-by: Puma Hsu Tested-by: Daehwan Jung Signed-off-by: Wesley Cheng Acked-by: Mark Brown Link: https://lore.kernel.org/r/20250409194804.3773260-4-quic_wcheng@quicinc.com Signed-off-by: Greg Kroah-Hartman

xhci: sideband: add initial api to register a secondary interrupter entity

2025-04-11T11:02:29Z

Introduce XHCI sideband, which manages the USB endpoints being requested by a client driver. This is used for when client drivers are attempting to offload USB endpoints to another entity for handling USB transfers. XHCI sec intr will allow for drivers to fetch the required information about the transfer ring, so the user can submit transfers independently. Expose the required APIs for drivers to register and request for a USB endpoint and to manage XHCI secondary interrupters. Driver renaming, multiple ring segment page linking, proper endpoint clean up, and allowing module compilation added by Wesley Cheng to complete original concept code by Mathias Nyman. Tested-by: Puma Hsu Tested-by: Daehwan Jung Signed-off-by: Mathias Nyman Co-developed-by: Wesley Cheng Signed-off-by: Wesley Cheng Acked-by: Mark Brown Link: https://lore.kernel.org/r/20250409194804.3773260-2-quic_wcheng@quicinc.com Signed-off-by: Greg Kroah-Hartman