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s390 cio: Rewrite trace point in s390_cio_interrupt 

Tools like 'perf stat' parse the trace point format files defined
in /sys/kernel/debug/tracing/events/s390/.../format to handle
the print fmt: statement. The kernel provides a library in
directory linux/tools/lib/traceevent/* for this reason.

This library can not handle structures or unions defined in
the TRACE_EVENT/TP_STRUCT__entry macros with __field_struct macro.
There is no possibility to extract a structure member
(which might be a bit field) since there is no packing
information nor bit field offset by parsing the printf fmt line.

Therefore rewrite the TRACE_EVENT macro and add the
__field macro for the necessary fields.
Keep the __fieldstruct macro to extract the complete
structure when dumps are analysed.

Note that the same information is displayed, this is no
interface change.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Acked-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Thomas Richter 2018-07-03 09:41:12 +02:00 committed by Martin Schwidefsky
parent cd0ed39dc9
commit 661c959bae
1 changed files with 8 additions and 4 deletions
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12
drivers/s390/cio/trace.h
View File

@ -299,16 +299,20 @@ TRACE_EVENT(s390_cio_interrupt,
__field(u8, cssid)
__field(u8, ssid)
__field(u16, schno)
__field(u8, isc)
__field(u8, type)
),
TP_fast_assign(
__entry->tpi_info = *tpi_info;
__entry->cssid = __entry->tpi_info.schid.cssid;
__entry->ssid = __entry->tpi_info.schid.ssid;
__entry->schno = __entry->tpi_info.schid.sch_no;
__entry->cssid = tpi_info->schid.cssid;
__entry->ssid = tpi_info->schid.ssid;
__entry->schno = tpi_info->schid.sch_no;
__entry->isc = tpi_info->isc;
__entry->type = tpi_info->type;
),
TP_printk("schid=%x.%x.%04x isc=%d type=%d",
__entry->cssid, __entry->ssid, __entry->schno,
__entry->tpi_info.isc, __entry->tpi_info.type
__entry->isc, __entry->type
)
);