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s390 cio: Rewrite trace point in s390_cio_stcrw

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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
the __field macro for the missing 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 <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 2018-07-11 10:27:12 +02:00 committed by Martin Schwidefsky
parent 5925e81927
commit 67faae1567
1 changed files with 17 additions and 3 deletions
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20
drivers/s390/cio/trace.h
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@ -349,16 +349,30 @@ TRACE_EVENT(s390_cio_stcrw,
TP_STRUCT__entry(
__field_struct(struct crw, crw)
__field(int, cc)
__field(u8, slct)
__field(u8, oflw)
__field(u8, chn)
__field(u8, rsc)
__field(u8, anc)
__field(u8, erc)
__field(u16, rsid)
),
TP_fast_assign(
__entry->crw = *crw;
__entry->cc = cc;
__entry->slct = crw->slct;
__entry->oflw = crw->oflw;
__entry->chn = crw->chn;
__entry->rsc = crw->rsc;
__entry->anc = crw->anc;
__entry->erc = crw->erc;
__entry->rsid = crw->rsid;
),
TP_printk("cc=%d slct=%d oflw=%d chn=%d rsc=%d anc=%d erc=0x%x "
"rsid=0x%x",
__entry->cc, __entry->crw.slct, __entry->crw.oflw,
__entry->crw.chn, __entry->crw.rsc, __entry->crw.anc,
__entry->crw.erc, __entry->crw.rsid
__entry->cc, __entry->slct, __entry->oflw,
__entry->chn, __entry->rsc, __entry->anc,
__entry->erc, __entry->rsid
)
);