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mac80211: trace debug messages

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It can be very useful to have all debug messages
available when debugging, but hard to correlate
between different sources, so add a trace event
for all mac80211 debug messages.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2012-06-22 13:36:25 +02:00
parent 011ad0e9f8
commit 3fae027316
4 changed files with 136 additions and 0 deletions
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13
net/mac80211/Kconfig
View File

@ -107,6 +107,19 @@ config MAC80211_DEBUGFS
Say N unless you know you need this.
config MAC80211_MESSAGE_TRACING
bool "Trace all mac80211 debug messages"
depends on MAC80211
---help---
Select this option to have mac80211 register the
mac80211_msg trace subsystem with tracepoints to
collect all debugging messages, independent of
printing them into the kernel log.
The overhead in this option is that all the messages
need to be present in the binary and formatted at
runtime for tracing.
menuconfig MAC80211_DEBUG_MENU
bool "Select mac80211 debugging features"
depends on MAC80211

18
net/mac80211/debug.h
View File

@ -1,5 +1,6 @@
#ifndef __MAC80211_DEBUG_H
#define __MAC80211_DEBUG_H
#include <net/cfg80211.h>
#ifdef CONFIG_MAC80211_IBSS_DEBUG
#define MAC80211_IBSS_DEBUG 1
@ -61,6 +62,22 @@
#define MAC80211_MLME_DEBUG 0
#endif
#ifdef CONFIG_MAC80211_MESSAGE_TRACING
void __sdata_info(const char *fmt, ...) __printf(1, 2);
void __sdata_dbg(bool print, const char *fmt, ...) __printf(2, 3);
void __sdata_err(const char *fmt, ...) __printf(1, 2);
void __wiphy_dbg(struct wiphy *wiphy, bool print, const char *fmt, ...)
__printf(3, 4);
#define _sdata_info(sdata, fmt, ...) \
__sdata_info("%s: " fmt, (sdata)->name, ##__VA_ARGS__)
#define _sdata_dbg(print, sdata, fmt, ...) \
__sdata_dbg(print, "%s: " fmt, (sdata)->name, ##__VA_ARGS__)
#define _sdata_err(sdata, fmt, ...) \
__sdata_err("%s: " fmt, (sdata)->name, ##__VA_ARGS__)
#define _wiphy_dbg(print, wiphy, fmt, ...) \
__wiphy_dbg(wiphy, print, fmt, ##__VA_ARGS__)
#else
#define _sdata_info(sdata, fmt, ...) \
do { \
pr_info("%s: " fmt, \
@ -85,6 +102,7 @@ do { \
if (print) \
wiphy_dbg((wiphy), fmt, ##__VA_ARGS__); \
} while (0)
#endif
#define sdata_info(sdata, fmt, ...) \
_sdata_info(sdata, fmt, ##__VA_ARGS__)

66
net/mac80211/trace.c
View File

@ -3,7 +3,73 @@
/* sparse isn't too happy with all macros... */
#ifndef __CHECKER__
#include <net/cfg80211.h>
#include "driver-ops.h"
#include "debug.h"
#define CREATE_TRACE_POINTS
#include "trace.h"
#ifdef CONFIG_MAC80211_MESSAGE_TRACING
void __sdata_info(const char *fmt, ...)
{
struct va_format vaf = {
.fmt = fmt,
};
va_list args;
va_start(args, fmt);
vaf.va = &args;
pr_info("%pV", &vaf);
trace_mac80211_info(&vaf);
va_end(args);
}
void __sdata_dbg(bool print, const char *fmt, ...)
{
struct va_format vaf = {
.fmt = fmt,
};
va_list args;
va_start(args, fmt);
vaf.va = &args;
if (print)
pr_debug("%pV", &vaf);
trace_mac80211_dbg(&vaf);
va_end(args);
}
void __sdata_err(const char *fmt, ...)
{
struct va_format vaf = {
.fmt = fmt,
};
va_list args;
va_start(args, fmt);
vaf.va = &args;
pr_err("%pV", &vaf);
trace_mac80211_err(&vaf);
va_end(args);
}
void __wiphy_dbg(struct wiphy *wiphy, bool print, const char *fmt, ...)
{
struct va_format vaf = {
.fmt = fmt,
};
va_list args;
va_start(args, fmt);
vaf.va = &args;
if (print)
wiphy_dbg(wiphy, "%pV", &vaf);
trace_mac80211_dbg(&vaf);
va_end(args);
}
#endif
#endif

39
net/mac80211/trace.h
View File

@ -1632,6 +1632,45 @@ TRACE_EVENT(stop_queue,
LOCAL_PR_ARG, __entry->queue, __entry->reason
)
);
#ifdef CONFIG_MAC80211_MESSAGE_TRACING
#undef TRACE_SYSTEM
#define TRACE_SYSTEM mac80211_msg
#define MAX_MSG_LEN 100
DECLARE_EVENT_CLASS(mac80211_msg_event,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf),
TP_STRUCT__entry(
__dynamic_array(char, msg, MAX_MSG_LEN)
),
TP_fast_assign(
WARN_ON_ONCE(vsnprintf(__get_dynamic_array(msg),
MAX_MSG_LEN, vaf->fmt,
*vaf->va) >= MAX_MSG_LEN);
),
TP_printk("%s", __get_str(msg))
);
DEFINE_EVENT(mac80211_msg_event, mac80211_info,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
DEFINE_EVENT(mac80211_msg_event, mac80211_dbg,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
DEFINE_EVENT(mac80211_msg_event, mac80211_err,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
#endif
#endif /* !__MAC80211_DRIVER_TRACE || TRACE_HEADER_MULTI_READ */
#undef TRACE_INCLUDE_PATH