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xhci: trace debug statements related to ring expansion

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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>
This commit is contained in:
Xenia Ragiadakou 2013-08-14 06:33:56 +03:00 committed by Sarah Sharp
parent d195fcffe4
commit 68ffb01111
3 changed files with 9 additions and 3 deletions
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3
drivers/usb/host/xhci-mem.c
View file

@ -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;

4
drivers/usb/host/xhci-ring.c
View file

@ -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)) {

5
drivers/usb/host/xhci-trace.h
View file

@ -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),