xhci: add xhci_cmd_completion trace event

This patch creates a new event class, called xhci_log_event,
and defines the xhci_cmd_completion trace event used for
tracing the commands issued to xHC that generate a completion
event in the event ring.

This info can be used, later, to print, in a human readable
way, the completion status and flags as well as the command's
type and fields using the trace-cmd tool and the appropriate
plugin.

Also, a tracepoint is added in handle_cmd_completion().

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

2 files changed, 33 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 3393ce755b15..86971ac5851b 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1380,6 +1380,9 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
                 return;
         }
 
+        trace_xhci_cmd_completion(&xhci->cmd_ring->dequeue->generic,
+                                        (struct xhci_generic_trb *) event);
+
         if ((GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_CMD_ABORT) ||
                 (GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_CMD_STOP)) {
                 /* If the return value is 0, we think the trb pointed by
diff --git a/drivers/usb/host/xhci-trace.h b/drivers/usb/host/xhci-trace.h
index c653ddfc0211..d6c222916858 100644
--- a/drivers/usb/host/xhci-trace.h
+++ b/drivers/usb/host/xhci-trace.h
@@ -93,6 +93,36 @@ DEFINE_EVENT(xhci_log_ctx, xhci_address_ctx,
         TP_ARGS(xhci, ctx, ep_num)
 );
 
+DECLARE_EVENT_CLASS(xhci_log_event,
+        TP_PROTO(void *trb_va, struct xhci_generic_trb *ev),
+        TP_ARGS(trb_va, ev),
+        TP_STRUCT__entry(
+                __field(void *, va)
+                __field(u64, dma)
+                __field(u32, status)
+                __field(u32, flags)
+                __dynamic_array(__le32, trb, 4)
+        ),
+        TP_fast_assign(
+                __entry->va = trb_va;
+                __entry->dma = le64_to_cpu(((u64)ev->field[1]) << 32 |
+                                                ev->field[0]);
+                __entry->status = le32_to_cpu(ev->field[2]);
+                __entry->flags = le32_to_cpu(ev->field[3]);
+                memcpy(__get_dynamic_array(trb), trb_va,
+                        sizeof(struct xhci_generic_trb));
+        ),
+        TP_printk("\ntrb_dma=@%llx, trb_va=@%p, status=%08x, flags=%08x",
+                        (unsigned long long) __entry->dma, __entry->va,
+                        __entry->status, __entry->flags
+        )
+);
+
+DEFINE_EVENT(xhci_log_event, xhci_cmd_completion,
+        TP_PROTO(void *trb_va, struct xhci_generic_trb *ev),
+        TP_ARGS(trb_va, ev)
+);
+
 #endif /* __XHCI_TRACE_H */
 
 /* this part must be outside header guard */