ehci: add doorbell trace events

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 1defcbd)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

hw/usb/hcd-ehci.c

@@ -1241,6 +1241,7 @@ static void ehci_mem_writel(void *ptr, target_phys_addr_t addr, uint32_t val)
              */
             s->async_stepdown = 0;
             qemu_bh_schedule(s->async_bh);
+            trace_usb_ehci_doorbell_ring();
         }
 
         if (((USBCMD_RUNSTOP | USBCMD_PSE | USBCMD_ASE) & val) !=
@@ -2335,7 +2336,7 @@ static void ehci_advance_async_state(EHCIState *ehci)
         if (ehci->usbcmd & USBCMD_IAAD) {
             /* Remove all unseen qhs from the async qhs queue */
             ehci_queues_rip_unused(ehci, async, 1);
-            DPRINTF("ASYNC: doorbell request acknowledged\n");
+            trace_usb_ehci_doorbell_ack();
             ehci->usbcmd &= ~USBCMD_IAAD;
             ehci_raise_irq(ehci, USBSTS_IAA);
         }

trace-events

@@ -264,6 +264,8 @@ usb_ehci_queue_action(void *q, const char *action) "q %p: %s"
 usb_ehci_packet_action(void *q, void *p, const char *action) "q %p p %p: %s"
 usb_ehci_irq(uint32_t level, uint32_t frindex, uint32_t sts, uint32_t mask) "level %d, frindex 0x%04x, sts 0x%x, mask 0x%x"
 usb_ehci_guest_bug(const char *reason) "%s"
+usb_ehci_doorbell_ring(void) ""
+usb_ehci_doorbell_ack(void) ""
 
 # hw/usb/hcd-uhci.c
 usb_uhci_reset(void) "=== RESET ==="