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@xxxxxxxxx>
---
drivers/usb/host/xhci-mem.c | 3 ++-
drivers/usb/host/xhci-ring.c | 4 ++--
drivers/usb/host/xhci-trace.h | 5 +++++
3 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index ef27470..b150360 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 f908e20..7b35af1 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 11025fe..20364cc 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),
--
1.8.3.2
--
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