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scsi: iscsi: Capture iscsi debug messages using tracepoints

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This commit enhances iscsi initiator modules to capture iscsi debug
messages using linux kernel tracepoint facility:

https://www.kernel.org/doc/Documentation/trace/tracepoints.txt

The following tracepoint events have been created under the iscsi
tracepoint event group:

iscsi_dbg_conn - to capture connection debug messages (libiscsi module)

iscsi_dbg_session - to capture session debug messages (libiscsi module)

iscsi_dbg_eh - to capture error handling debug messages (libiscsi module)

iscsi_dbg_tcp - to capture iscsi tcp debug messages (libiscsi_tcp module)

iscsi_dbg_sw_tcp - to capture iscsi sw tcp debug messages (iscsi_tcp module)

iscsi_dbg_trans_session - to cpature iscsi transsport sess debug messages
	(scsi_transport_iscsi module)

iscsi_dbg_trans_conn - to capture iscsi transport conn debug messages
	(scsi_transport_iscsi module)

[mkp: typos]

Signed-off-by: Fred Herard <fred.herard@oracle.com>
Reviewed-by: Rajan Shanmugavelu <rajan.shanmugavelu@oracle.com>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Fred Herard
2018-11-21 12:04:43 -05:00
committed by Martin K. Petersen
parent 4c5765e485
commit c2332b0049
5 changed files with 158 additions and 1 deletions
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107
include/trace/events/iscsi.h Normal file
View File

@@ -0,0 +1,107 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM iscsi
#if !defined(_TRACE_ISCSI_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_ISCSI_H
#include <linux/tracepoint.h>
/* max debug message length */
#define ISCSI_MSG_MAX 256
/*
* Declare tracepoint helper function.
*/
void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
struct device *dev, const char *fmt, ...);
/*
* Declare event class for iscsi debug messages.
*/
DECLARE_EVENT_CLASS(iscsi_log_msg,
TP_PROTO(struct device *dev, struct va_format *vaf),
TP_ARGS(dev, vaf),
TP_STRUCT__entry(
__string(dname, dev_name(dev) )
__dynamic_array(char, msg, ISCSI_MSG_MAX )
),
TP_fast_assign(
__assign_str(dname, dev_name(dev));
vsnprintf(__get_str(msg), ISCSI_MSG_MAX, vaf->fmt, *vaf->va);
),
TP_printk("%s: %s",__get_str(dname), __get_str(msg)
)
);
/*
* Define event to capture iscsi connection debug messages.
*/
DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_conn,
TP_PROTO(struct device *dev, struct va_format *vaf),
TP_ARGS(dev, vaf)
);
/*
* Define event to capture iscsi session debug messages.
*/
DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_session,
TP_PROTO(struct device *dev, struct va_format *vaf),
TP_ARGS(dev, vaf)
);
/*
* Define event to capture iscsi error handling debug messages.
*/
DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_eh,
TP_PROTO(struct device *dev, struct va_format *vaf),
TP_ARGS(dev, vaf)
);
/*
* Define event to capture iscsi tcp debug messages.
*/
DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_tcp,
TP_PROTO(struct device *dev, struct va_format *vaf),
TP_ARGS(dev, vaf)
);
/*
* Define event to capture iscsi sw tcp debug messages.
*/
DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_sw_tcp,
TP_PROTO(struct device *dev, struct va_format *vaf),
TP_ARGS(dev, vaf)
);
/*
* Define event to capture iscsi transport session debug messages.
*/
DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_trans_session,
TP_PROTO(struct device *dev, struct va_format *vaf),
TP_ARGS(dev, vaf)
);
/*
* Define event to capture iscsi transport connection debug messages.
*/
DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_trans_conn,
TP_PROTO(struct device *dev, struct va_format *vaf),
TP_ARGS(dev, vaf)
);
#endif /* _TRACE_ISCSI_H */
/* This part must be outside protection */
#include <trace/define_trace.h>