xhci: add tracepoint for endpoint state changes

Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/usb/hcd-xhci.c

@@ -586,6 +586,14 @@ static const char *TRBCCode_names[] = {
     [CC_SPLIT_TRANSACTION_ERROR]       = "CC_SPLIT_TRANSACTION_ERROR",
 };
 
+static const char *ep_state_names[] = {
+    [EP_DISABLED] = "disabled",
+    [EP_RUNNING]  = "running",
+    [EP_HALTED]   = "halted",
+    [EP_STOPPED]  = "stopped",
+    [EP_ERROR]    = "error",
+};
+
 static const char *lookup_name(uint32_t index, const char **list, uint32_t llen)
 {
     if (index >= llen || list[index] == NULL) {
@@ -606,6 +614,12 @@ static const char *event_name(XHCIEvent *event)
                        ARRAY_SIZE(TRBCCode_names));
 }
 
+static const char *ep_state_name(uint32_t state)
+{
+    return lookup_name(state, ep_state_names,
+                       ARRAY_SIZE(ep_state_names));
+}
+
 static uint64_t xhci_mfindex_get(XHCIState *xhci)
 {
     int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
@@ -1203,6 +1217,11 @@ static void xhci_set_ep_state(XHCIState *xhci, XHCIEPContext *epctx,
     }
 
     xhci_dma_write_u32s(xhci, epctx->pctx, ctx, sizeof(ctx));
+    if (epctx->state != state) {
+        trace_usb_xhci_ep_state(epctx->slotid, epctx->epid,
+                                ep_state_name(epctx->state),
+                                ep_state_name(state));
+    }
     epctx->state = state;
 }
 

trace-events

@@ -381,6 +381,7 @@ usb_xhci_ep_set_dequeue(uint32_t slotid, uint32_t epid, uint32_t streamid, uint6
 usb_xhci_ep_kick(uint32_t slotid, uint32_t epid, uint32_t streamid) "slotid %d, epid %d, streamid %d"
 usb_xhci_ep_stop(uint32_t slotid, uint32_t epid) "slotid %d, epid %d"
 usb_xhci_ep_reset(uint32_t slotid, uint32_t epid) "slotid %d, epid %d"
+usb_xhci_ep_state(uint32_t slotid, uint32_t epid, const char *os, const char *ns) "slotid %d, epid %d, %s -> %s"
 usb_xhci_xfer_start(void *xfer, uint32_t slotid, uint32_t epid, uint32_t streamid) "%p: slotid %d, epid %d, streamid %d"
 usb_xhci_xfer_async(void *xfer) "%p"
 usb_xhci_xfer_nak(void *xfer) "%p"