DM USB: xHCI: add 'chained' field in struct usb_data_xfer_block

The chained field could help to describe the relationship of USB
data blocks.

Tracked-On: #3054
Signed-off-by: Xiaoguang Wu <xiaoguang.wu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>

Author: xiaoguangwu

devicemodel/hw/pci/xhci.c

@@ -2875,6 +2875,9 @@ pci_xhci_handle_transfer(struct pci_xhci_vdev *xdev,
 					XHCI_GADDR(xdev, trb->qwTrb0)),
 					trb->dwTrb2 & 0x1FFFF, (void *)addr,
 					ccs);
+
+			if (trb->dwTrb3 & XHCI_TRB_3_CHAIN_BIT)
+				xfer_block->chained = 1;
 			break;
 
 		case XHCI_TRB_TYPE_STATUS_STAGE:

devicemodel/hw/usb_core.c

@@ -117,6 +117,7 @@ usb_data_xfer_append(struct usb_data_xfer *xfer, void *buf, int blen,
 	xb->ccs = ccs;
 	xb->processed = USB_XFER_BLK_FREE;
 	xb->bdone = 0;
+	xb->chained = 0;
 	xfer->ndata++;
 	xfer->tail = (xfer->tail + 1) % USB_MAX_XFER_BLOCKS;
 	return xb;

devicemodel/include/usb_core.h

@@ -155,6 +155,7 @@ struct usb_data_xfer_block {
 	enum usb_xfer_blk_stat	processed; /* processed status */
 	void			*hci_data; /* HCI private reference */
 	int			ccs;
+	int			chained;
 	uint32_t		streamid;
 	uint64_t		trbnext;   /* next TRB guest address */
 };