xhci: show usb device name in xhci urb tracing

parsing xhci traces on systems with several xHCI controllers and connected
usb devices is difficult as entries are all interleaved.

showing usb devname in urb tracing reveals both which device, and which
bus/controller the entry is for.

old:
xhci_urb_enqueue: ep2in-bulk: urb 0000000039224498  ...

new:
xhci_urb_enqueue: 3-9.4 ep1in-bulk: urb 0000000013bf21e7 ...
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20240626124835.1023046-3-mathias.nyman@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-trace.h

@@ -250,6 +250,7 @@ DECLARE_EVENT_CLASS(xhci_log_urb,
 	TP_PROTO(struct urb *urb),
 	TP_ARGS(urb),
 	TP_STRUCT__entry(
+		__string(devname, dev_name(&urb->dev->dev))
 		__field(void *, urb)
 		__field(unsigned int, pipe)
 		__field(unsigned int, stream)
@@ -265,6 +266,7 @@ DECLARE_EVENT_CLASS(xhci_log_urb,
 		__field(int, slot_id)
 	),
 	TP_fast_assign(
+		__assign_str(devname);
 		__entry->urb = urb;
 		__entry->pipe = urb->pipe;
 		__entry->stream = urb->stream_id;
@@ -279,7 +281,8 @@ DECLARE_EVENT_CLASS(xhci_log_urb,
 		__entry->type = usb_endpoint_type(&urb->ep->desc);
 		__entry->slot_id = urb->dev->slot_id;
 	),
-	TP_printk("ep%d%s-%s: urb %p pipe %u slot %d length %d/%d sgs %d/%d stream %d flags %08x",
+	TP_printk("%s ep%d%s-%s: urb %p pipe %u slot %d length %d/%d sgs %d/%d stream %d flags %08x",
+			__get_str(devname),
 			__entry->epnum, __entry->dir_in ? "in" : "out",
 			__print_symbolic(__entry->type,
 				   { USB_ENDPOINT_XFER_INT,	"intr" },