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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: Bin Liu <b-liu@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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4 changed files with 93 additions and 1 deletions
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# for USB OTG silicon based on Mentor Graphics INVENTRA designs
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#
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# define_trace.h needs to know how to find our header
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CFLAGS_musb_trace.o := -I$(src)
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obj-$(CONFIG_USB_MUSB_HDRC) += musb_hdrc.o
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musb_hdrc-y := musb_core.o
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musb_hdrc-y := musb_core.o musb_trace.o
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musb_hdrc-$(CONFIG_USB_MUSB_HOST)$(CONFIG_USB_MUSB_DUAL_ROLE) += musb_virthub.o musb_host.o
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musb_hdrc-$(CONFIG_USB_MUSB_GADGET)$(CONFIG_USB_MUSB_DUAL_ROLE) += musb_gadget_ep0.o musb_gadget.o
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@ -42,6 +42,8 @@
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#define INFO(fmt, args...) yprintk(KERN_INFO, fmt, ## args)
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#define ERR(fmt, args...) yprintk(KERN_ERR, fmt, ## args)
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void musb_dbg(struct musb *musb, const char *fmt, ...);
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#ifdef CONFIG_DEBUG_FS
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int musb_init_debugfs(struct musb *musb);
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void musb_exit_debugfs(struct musb *musb);
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33
drivers/usb/musb/musb_trace.c
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33
drivers/usb/musb/musb_trace.c
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/*
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* musb_trace.c - MUSB Controller Trace Support
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*
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* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
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*
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* Author: Bin Liu <b-liu@ti.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define CREATE_TRACE_POINTS
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#include "musb_trace.h"
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void musb_dbg(struct musb *musb, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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trace_musb_log(musb, &vaf);
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va_end(args);
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}
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54
drivers/usb/musb/musb_trace.h
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54
drivers/usb/musb/musb_trace.h
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/*
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* musb_trace.h - MUSB Controller Trace Support
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*
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* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
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*
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* Author: Bin Liu <b-liu@ti.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM musb
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#if !defined(__MUSB_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
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#define __MUSB_TRACE_H
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#include <linux/types.h>
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#include <linux/tracepoint.h>
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#include "musb_core.h"
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#define MUSB_MSG_MAX 500
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TRACE_EVENT(musb_log,
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TP_PROTO(struct musb *musb, struct va_format *vaf),
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TP_ARGS(musb, vaf),
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TP_STRUCT__entry(
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__string(name, dev_name(musb->controller))
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__dynamic_array(char, msg, MUSB_MSG_MAX)
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),
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TP_fast_assign(
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__assign_str(name, dev_name(musb->controller));
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vsnprintf(__get_str(msg), MUSB_MSG_MAX, vaf->fmt, *vaf->va);
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),
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TP_printk("%s: %s", __get_str(name), __get_str(msg))
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);
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#endif /* __MUSB_TRACE_H */
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/* this part has to be here */
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#undef TRACE_INCLUDE_PATH
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#define TRACE_INCLUDE_PATH .
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_FILE musb_trace
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#include <trace/define_trace.h>
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