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path: root/include/linux/usb/xhci-sideband.h
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2025-04-11usb: host: xhci: Notify xHCI sideband on transfer ring freeWesley Cheng
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 <pumahsu@google.com> Tested-by: Daehwan Jung <dh10.jung@samsung.com> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> Acked-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20250409194804.3773260-6-quic_wcheng@quicinc.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-04-11usb: host: xhci-mem: Allow for interrupter clients to choose specific indexWesley Cheng
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 <pumahsu@google.com> Tested-by: Daehwan Jung <dh10.jung@samsung.com> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> Acked-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20250409194804.3773260-4-quic_wcheng@quicinc.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-04-11xhci: sideband: add initial api to register a secondary interrupter entityMathias Nyman
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 <pumahsu@google.com> Tested-by: Daehwan Jung <dh10.jung@samsung.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Co-developed-by: Wesley Cheng <quic_wcheng@quicinc.com> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> Acked-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20250409194804.3773260-2-quic_wcheng@quicinc.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>