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s390 cio: Rewrite trace point in s390_cio_adapter_int

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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 members.
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 <[email protected]>
Reviewed-by: Peter Oberparleiter <[email protected]>
Acked-by: Sebastian Ott <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Thomas Richter 2018-07-03 10:38:16 +02:00 • committed by Martin Schwidefsky
commit 27c0620ce9
1 changed files with 3 additions and 1 deletions
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4
drivers/s390/cio/trace.h
View file

@ -331,11 +331,13 @@ TRACE_EVENT(s390_cio_adapter_int,
TP_ARGS(tpi_info),
TP_STRUCT__entry(
__field_struct(struct tpi_info, tpi_info)
__field(u8, isc)
),
TP_fast_assign(
__entry->tpi_info = *tpi_info;
__entry->isc = tpi_info->isc;
),
TP_printk("isc=%d", __entry->tpi_info.isc)
TP_printk("isc=%d", __entry->isc)
);
/**