static void xhci_kick_epctx(XHCIEPContext *epctx, unsigned int streamid) { XHCIState *xhci = epctx->xhci; XHCIStreamContext *stctx; XHCITransfer *xfer; XHCIRing *ring; USBEndpoint *ep = NULL; uint64_t mfindex; int length; int i; trace_usb_xhci_ep_kick(epctx->slotid, epctx->epid, streamid); /* If the device has been detached, but the guest has not noticed this yet the 2 above checks will succeed, but we must NOT continue */ if (!xhci->slots[epctx->slotid - 1].uport || !xhci->slots[epctx->slotid - 1].uport->dev || !xhci->slots[epctx->slotid - 1].uport->dev->attached) { return; } if (epctx->retry) { XHCITransfer *xfer = epctx->retry; trace_usb_xhci_xfer_retry(xfer); assert(xfer->running_retry); if (xfer->timed_xfer) { /* time to kick the transfer? */ mfindex = xhci_mfindex_get(xhci); xhci_check_intr_iso_kick(xhci, xfer, epctx, mfindex); if (xfer->running_retry) { return; } xfer->timed_xfer = 0; xfer->running_retry = 1; } if (xfer->iso_xfer) { /* retry iso transfer */ if (xhci_setup_packet(xfer) < 0) { return; } usb_handle_packet(xfer->packet.ep->dev, &xfer->packet); assert(xfer->packet.status != USB_RET_NAK); xhci_complete_packet(xfer); } else { /* retry nak'ed transfer */ if (xhci_setup_packet(xfer) < 0) { return; } usb_handle_packet(xfer->packet.ep->dev, &xfer->packet); if (xfer->packet.status == USB_RET_NAK) { return; } xhci_complete_packet(xfer); } assert(!xfer->running_retry); xhci_ep_free_xfer(epctx->retry); epctx->retry = NULL; } if (epctx->state == EP_HALTED) { DPRINTF("xhci: ep halted, not running schedule\n"); return; } if (epctx->nr_pstreams) { uint32_t err; stctx = xhci_find_stream(epctx, streamid, &err); if (stctx == NULL) { return; } ring = &stctx->ring; xhci_set_ep_state(xhci, epctx, stctx, EP_RUNNING); } else { ring = &epctx->ring; streamid = 0; xhci_set_ep_state(xhci, epctx, NULL, EP_RUNNING); } assert(ring->dequeue != 0); while (1) { length = xhci_ring_chain_length(xhci, ring); if (length <= 0) { break; } xfer = xhci_ep_alloc_xfer(epctx, length); if (xfer == NULL) { break; } for (i = 0; i < length; i++) { TRBType type; type = xhci_ring_fetch(xhci, ring, &xfer->trbs[i], NULL); assert(type); } xfer->streamid = streamid; if (epctx->epid == 1) { xhci_fire_ctl_transfer(xhci, xfer); } else { xhci_fire_transfer(xhci, xfer, epctx); } if (xfer->complete) { xhci_ep_free_xfer(xfer); xfer = NULL; } if (epctx->state == EP_HALTED) { break; } if (xfer != NULL && xfer->running_retry) { DPRINTF("xhci: xfer nacked, stopping schedule\n"); epctx->retry = xfer; break; } } ep = xhci_epid_to_usbep(epctx); if (ep) { usb_device_flush_ep_queue(ep->dev, ep); } }