devices::usb::xhci::transfer_ring_controller

Struct TransferRingTrbHandler

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pub struct TransferRingTrbHandler {
    mem: GuestMemory,
    port: Arc<UsbPort>,
    interrupter: Arc<Mutex<Interrupter>>,
    slot_id: u8,
    endpoint_id: u8,
    transfer_manager: XhciTransferManager,
    stream_id: Option<u16>,
}
Expand description

TransferRingTrbHandler handles trbs on transfer ring.

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§mem: GuestMemory§port: Arc<UsbPort>§interrupter: Arc<Mutex<Interrupter>>§slot_id: u8§endpoint_id: u8§transfer_manager: XhciTransferManager§stream_id: Option<u16>

Trait Implementations§

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impl TransferDescriptorHandler for TransferRingTrbHandler

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fn handle_transfer_descriptor( &self, descriptor: TransferDescriptor, trigger_event: Event, ) -> Result<()>

Process descriptor asynchronously, signal trigger_event when ready to proceed.
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fn cancel_transfers(&self, callback: RingBufferStopCallback)

Cancel transfers. This is used to stop the ring activity as soon as possible when we process a Stop Endpoint command. xHCI spec 4.6.9 states we need to stop the USB activity for the pipe before sending the completion event. Use the callback to ensure that all the in-flight transfers are gone before sending the event, if the backend cannot immediately cancel them.

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