usb-host: trace canceled requests

Add tracepoints to track canceled requests.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/usb/host-linux.c

@@ -392,12 +392,14 @@ static void usb_host_async_cancel(USBDevice *dev, USBPacket *p)
     USBHostDevice *s = DO_UPCAST(USBHostDevice, dev, dev);
     AsyncURB *aurb;
 
+    trace_usb_host_req_canceled(s->bus_num, s->addr);
+
     QLIST_FOREACH(aurb, &s->aurbs, next) {
         if (p != aurb->packet) {
             continue;
         }
 
-        DPRINTF("husb: async cancel: packet %p, aurb %p\n", p, aurb);
+        trace_usb_host_urb_canceled(s->bus_num, s->addr, aurb);
 
         /* Mark it as dead (see async_complete above) */
         aurb->packet = NULL;

trace-events

@@ -316,8 +316,10 @@ usb_host_req_control(int bus, int addr, int req, int value, int index) "dev %d:%
 usb_host_req_data(int bus, int addr, int in, int ep, int size) "dev %d:%d, in %d, ep %d, size %d"
 usb_host_req_complete(int bus, int addr, int status) "dev %d:%d, status %d"
 usb_host_req_emulated(int bus, int addr, int status) "dev %d:%d, status %d"
+usb_host_req_canceled(int bus, int addr) "dev %d:%d"
 usb_host_urb_submit(int bus, int addr, void *aurb, int length, int more) "dev %d:%d, aurb %p, length %d, more %d"
 usb_host_urb_complete(int bus, int addr, void *aurb, int status, int length, int more) "dev %d:%d, aurb %p, status %d, length %d, more %d"
+usb_host_urb_canceled(int bus, int addr, void *aurb) "dev %d:%d, aurb %p"
 usb_host_ep_set_halt(int bus, int addr, int ep) "dev %d:%d, ep %d"
 usb_host_ep_clear_halt(int bus, int addr, int ep) "dev %d:%d, ep %d"
 usb_host_ep_start_iso(int bus, int addr, int ep) "dev %d:%d, ep %d"