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Commit f89252ad authored by Bin Liu's avatar Bin Liu Committed by Greg Kroah-Hartman
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usb: musb: add tracepoints support for debugging 



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

Signed-off-by: default avatarBin Liu <b-liu@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ca2b6fae

drivers/usb/musb/Makefile

+4 −1
Original line number Diff line number Diff line
@@ -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

drivers/usb/musb/musb_debug.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

drivers/usb/musb/musb_trace.c

0 → 100644
+33 −0
Original line number Diff line number Diff line 
/*

 * 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);

}

drivers/usb/musb/musb_trace.h

0 → 100644
+54 −0
Original line number Diff line number Diff line 
/*

 * 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>