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| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2019-11-15 18:50:01 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-16 10:26:05 +0100 |
| commit | 58b9d71a0f55e2514211875553dd092f74dc2cbc (patch) | |
| tree | 03716ff550793fd67da3daa5d188477355402999 /drivers/usb/host/xhci-ring.c | |
| parent | dc0ffbea5729a3abafa577ebfce87f18b79e294b (diff) | |
| download | lwn-58b9d71a0f55e2514211875553dd092f74dc2cbc.tar.gz lwn-58b9d71a0f55e2514211875553dd092f74dc2cbc.zip | |
xhci: Add tracing for xhci doorbell register writes
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>
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 55084adf1faf..bfd4d34c2535 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -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. |