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xhci: add xhci_cmd_completion trace event

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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>
This commit is contained in:
Xenia Ragiadakou 2013-08-06 07:52:48 +03:00 committed by Sarah Sharp
parent 1d27fabec0
commit 63a23b9a74
2 changed files with 33 additions and 0 deletions
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3
drivers/usb/host/xhci-ring.c
View File

@ -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

30
drivers/usb/host/xhci-trace.h
View File

@ -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 */