xhci: trace debug statements related to ring expansion

This patch defines a new trace event, which is called xhci_dbg_ring_expansion
and belongs to the event class xhci_log_msg, and adds tracepoints that trace
the debug messages associated with the expansion of endpoint ring when there
is not enough space allocated to hold all pending TRBs.

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

3 files changed, 9 insertions, 3 deletions

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index ef27470b99e3..b150360d1e78 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -348,7 +348,8 @@ int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring,
                 return -ENOMEM;
 
         xhci_link_rings(xhci, ring, first, last, num_segs);
-        xhci_dbg(xhci, "ring expansion succeed, now has %d segments\n",
+        xhci_dbg_trace(xhci, trace_xhci_dbg_ring_expansion,
+                        "ring expansion succeed, now has %d segments",
                         ring->num_segs);
 
         return 0;
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index f908e205f7d5..7b35af167e55 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2904,8 +2904,8 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
                         return -ENOMEM;
                 }
 
-                xhci_dbg(xhci, "ERROR no room on ep ring, "
-                                        "try ring expansion\n");
+                xhci_dbg_trace(xhci, trace_xhci_dbg_ring_expansion,
+                                "ERROR no room on ep ring, try ring expansion");
                 num_trbs_needed = num_trbs - ep_ring->num_trbs_free;
                 if (xhci_ring_expansion(xhci, ep_ring, num_trbs_needed,
                                         mem_flags)) {
diff --git a/drivers/usb/host/xhci-trace.h b/drivers/usb/host/xhci-trace.h
index 11025fe6ebba..20364cc8d2fb 100644
--- a/drivers/usb/host/xhci-trace.h
+++ b/drivers/usb/host/xhci-trace.h
@@ -62,6 +62,11 @@ DEFINE_EVENT(xhci_log_msg, xhci_dbg_init,
         TP_ARGS(vaf)
 );
 
+DEFINE_EVENT(xhci_log_msg, xhci_dbg_ring_expansion,
+        TP_PROTO(struct va_format *vaf),
+        TP_ARGS(vaf)
+);
+
 DECLARE_EVENT_CLASS(xhci_log_ctx,
         TP_PROTO(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx,
                  unsigned int ep_num),