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xhci: Add tracing for xhci doorbell register writes

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Trace when a register in the doorbell array is written,
both for host controller command doorbell and device doorbells,
including for which endpoint and stream

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/1573836603-10871-3-git-send-email-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2019-11-15 18:50:01 +02:00 committed by Greg Kroah-Hartman
parent dc0ffbea57
commit 58b9d71a0f
3 changed files with 61 additions and 0 deletions
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6
drivers/usb/host/xhci-ring.c
View File

@ -280,6 +280,9 @@ void xhci_ring_cmd_db(struct xhci_hcd *xhci)
return;
xhci_dbg(xhci, "// Ding dong!\n");
trace_xhci_ring_host_doorbell(0, DB_VALUE_HOST);
writel(DB_VALUE_HOST, &xhci->dba->doorbell[0]);
/* Flush PCI posted writes */
readl(&xhci->dba->doorbell[0]);
@ -401,6 +404,9 @@ void xhci_ring_ep_doorbell(struct xhci_hcd *xhci,
if ((ep_state & EP_STOP_CMD_PENDING) || (ep_state & SET_DEQ_PENDING) ||
(ep_state & EP_HALTED) || (ep_state & EP_CLEARING_TT))
return;
trace_xhci_ring_ep_doorbell(slot_id, DB_VALUE(ep_index, stream_id));
writel(DB_VALUE(ep_index, stream_id), db_addr);
/* The CPU has better things to do at this point than wait for a
* write-posting flush. It'll get there soon enough.

26
drivers/usb/host/xhci-trace.h
View File

@ -560,6 +560,32 @@ DEFINE_EVENT(xhci_log_portsc, xhci_hub_status_data,
TP_ARGS(portnum, portsc)
);
DECLARE_EVENT_CLASS(xhci_log_doorbell,
TP_PROTO(u32 slot, u32 doorbell),
TP_ARGS(slot, doorbell),
TP_STRUCT__entry(
__field(u32, slot)
__field(u32, doorbell)
),
TP_fast_assign(
__entry->slot = slot;
__entry->doorbell = doorbell;
),
TP_printk("Ring doorbell for %s",
xhci_decode_doorbell(__entry->slot, __entry->doorbell)
)
);
DEFINE_EVENT(xhci_log_doorbell, xhci_ring_ep_doorbell,
TP_PROTO(u32 slot, u32 doorbell),
TP_ARGS(slot, doorbell)
);
DEFINE_EVENT(xhci_log_doorbell, xhci_ring_host_doorbell,
TP_PROTO(u32 slot, u32 doorbell),
TP_ARGS(slot, doorbell)
);
DECLARE_EVENT_CLASS(xhci_dbc_log_request,
TP_PROTO(struct dbc_request *req),
TP_ARGS(req),

29
drivers/usb/host/xhci.h
View File

@ -2580,6 +2580,35 @@ static inline const char *xhci_decode_portsc(u32 portsc)
return str;
}
static inline const char *xhci_decode_doorbell(u32 slot, u32 doorbell)
{
static char str[256];
u8 ep;
u16 stream;
int ret;
ep = (doorbell & 0xff);
stream = doorbell >> 16;
if (slot == 0) {
sprintf(str, "Command Ring %d", doorbell);
return str;
}
ret = sprintf(str, "Slot %d ", slot);
if (ep > 0 && ep < 32)
ret = sprintf(str + ret, "ep%d%s",
ep / 2,
ep % 2 ? "in" : "out");
else if (ep == 0 || ep < 248)
ret = sprintf(str + ret, "Reserved %d", ep);
else
ret = sprintf(str + ret, "Vendor Defined %d", ep);
if (stream)
ret = sprintf(str + ret, " Stream %d", stream);
return str;
}
static inline const char *xhci_ep_state_string(u8 state)
{
switch (state) {