From 2c4cbe6e5a9c71408b496e00a78ea9284e98af16 Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Wed, 30 Apr 2014 17:45:10 -0500 Subject: usb: dwc3: add tracepoints to aid debugging When we're debugging hard-to-reproduce and time-sensitive use cases, printk() poses too much overhead. That's when the kernel's tracing infrastructure comes into play. This patch implements a few initial tracepoints for the dwc3 driver. More traces can be added as necessary in order to ease the task of debugging dwc3. Reviewed-by: Paul Zimmerman Signed-off-by: Felipe Balbi --- drivers/usb/dwc3/debug.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 drivers/usb/dwc3/debug.c (limited to 'drivers/usb/dwc3/debug.c') diff --git a/drivers/usb/dwc3/debug.c b/drivers/usb/dwc3/debug.c new file mode 100644 index 000000000000..0be6885bc370 --- /dev/null +++ b/drivers/usb/dwc3/debug.c @@ -0,0 +1,32 @@ +/** + * debug.c - DesignWare USB3 DRD Controller Debug/Trace Support + * + * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com + * + * Author: Felipe Balbi + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include "debug.h" + +void dwc3_trace(void (*trace)(struct va_format *), const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + + trace(&vaf); + + va_end(args); +} -- cgit v1.2.3