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usb: musb: add tracepoints support for debugging

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To avoid printk() overhead while debugging, this patch implements the
foundation of tracepoints logging for musb driver to make debug
easier.

Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bin Liu 2016-06-30 12:12:21 -05:00 committed by Greg Kroah-Hartman
parent ca2b6faeb9
commit f89252ad19
4 changed files with 93 additions and 1 deletions
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5
drivers/usb/musb/Makefile
View file

@ -2,9 +2,12 @@
# for USB OTG silicon based on Mentor Graphics INVENTRA designs
#
# define_trace.h needs to know how to find our header
CFLAGS_musb_trace.o := -I$(src)
obj-$(CONFIG_USB_MUSB_HDRC) += musb_hdrc.o
musb_hdrc-y := musb_core.o
musb_hdrc-y := musb_core.o musb_trace.o
musb_hdrc-$(CONFIG_USB_MUSB_HOST)$(CONFIG_USB_MUSB_DUAL_ROLE) += musb_virthub.o musb_host.o
musb_hdrc-$(CONFIG_USB_MUSB_GADGET)$(CONFIG_USB_MUSB_DUAL_ROLE) += musb_gadget_ep0.o musb_gadget.o

2
drivers/usb/musb/musb_debug.h
View file

@ -42,6 +42,8 @@
#define INFO(fmt, args...) yprintk(KERN_INFO, fmt, ## args)
#define ERR(fmt, args...) yprintk(KERN_ERR, fmt, ## args)
void musb_dbg(struct musb *musb, const char *fmt, ...);
#ifdef CONFIG_DEBUG_FS
int musb_init_debugfs(struct musb *musb);
void musb_exit_debugfs(struct musb *musb);

33
drivers/usb/musb/musb_trace.c Normal file
View file

@ -0,0 +1,33 @@
/*
* musb_trace.c - MUSB Controller Trace Support
*
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
*
* Author: Bin Liu <b-liu@ti.com>
*
* 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.
*/
#define CREATE_TRACE_POINTS
#include "musb_trace.h"
void musb_dbg(struct musb *musb, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
trace_musb_log(musb, &vaf);
va_end(args);
}

54
drivers/usb/musb/musb_trace.h Normal file
View file

@ -0,0 +1,54 @@
/*
* musb_trace.h - MUSB Controller Trace Support
*
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
*
* Author: Bin Liu <b-liu@ti.com>
*
* 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.
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM musb
#if !defined(__MUSB_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
#define __MUSB_TRACE_H
#include <linux/types.h>
#include <linux/tracepoint.h>
#include "musb_core.h"
#define MUSB_MSG_MAX 500
TRACE_EVENT(musb_log,
TP_PROTO(struct musb *musb, struct va_format *vaf),
TP_ARGS(musb, vaf),
TP_STRUCT__entry(
__string(name, dev_name(musb->controller))
__dynamic_array(char, msg, MUSB_MSG_MAX)
),
TP_fast_assign(
__assign_str(name, dev_name(musb->controller));
vsnprintf(__get_str(msg), MUSB_MSG_MAX, vaf->fmt, *vaf->va);
),
TP_printk("%s: %s", __get_str(name), __get_str(msg))
);
#endif /* __MUSB_TRACE_H */
/* this part has to be here */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE musb_trace
#include <trace/define_trace.h>