[PULL 10/10] vfio-ccw: Add trace for CRW event

Cornelia Huck
2020-05-25T09:42:03Z

From: Eric Farman <farman@linux.ibm.com>

Since CRW events are (should be) rare, let's put a trace
in that routine too.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200505122745.53208-9-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
---
drivers/s390/cio/vfio_ccw_drv.c | 1 +
drivers/s390/cio/vfio_ccw_trace.c | 1 +
drivers/s390/cio/vfio_ccw_trace.h | 30 ++++++++++++++++++++++++++++++
3 files changed, 32 insertions(+)

diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c
index 9144360851ed..8c625b530035 100644
--- a/drivers/s390/cio/vfio_ccw_drv.c
+++ b/drivers/s390/cio/vfio_ccw_drv.c
@@ -336,6 +336,7 @@ static int vfio_ccw_chp_event(struct subchannel *sch,
if (!private || !mask)
return 0;

+ trace_vfio_ccw_chp_event(private->sch->schid, mask, event);
VFIO_CCW_MSG_EVENT(2, "%pUl (%x.%x.%04x): mask=0x%x event=%d\n",
mdev_uuid(private->mdev), sch->schid.cssid,
sch->schid.ssid, sch->schid.sch_no,
diff --git a/drivers/s390/cio/vfio_ccw_trace.c b/drivers/s390/cio/vfio_ccw_trace.c
index 8c671d2519f6..4a0205905afc 100644
--- a/drivers/s390/cio/vfio_ccw_trace.c
+++ b/drivers/s390/cio/vfio_ccw_trace.c
@@ -9,6 +9,7 @@
#define CREATE_TRACE_POINTS
#include "vfio_ccw_trace.h"

+EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_chp_event);
EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_fsm_async_request);
EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_fsm_event);
EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_fsm_io_request);
diff --git a/drivers/s390/cio/vfio_ccw_trace.h b/drivers/s390/cio/vfio_ccw_trace.h
index f5d31887d413..62fb30598d47 100644
--- a/drivers/s390/cio/vfio_ccw_trace.h
+++ b/drivers/s390/cio/vfio_ccw_trace.h
@@ -17,6 +17,36 @@

#include <linux/tracepoint.h>

+TRACE_EVENT(vfio_ccw_chp_event,
+ TP_PROTO(struct subchannel_id schid,
+ int mask,
+ int event),
+ TP_ARGS(schid, mask, event),
+
+ TP_STRUCT__entry(
+ __field(u8, cssid)
+ __field(u8, ssid)
+ __field(u16, sch_no)
+ __field(int, mask)
+ __field(int, event)
+ ),
+
+ TP_fast_assign(
+ __entry->cssid = schid.cssid;
+ __entry->ssid = schid.ssid;
+ __entry->sch_no = schid.sch_no;
+ __entry->mask = mask;
+ __entry->event = event;
+ ),
+
+ TP_printk("schid=%x.%x.%04x mask=0x%x event=%d",
+ __entry->cssid,
+ __entry->ssid,
+ __entry->sch_no,
+ __entry->mask,
+ __entry->event)
+);
+
TRACE_EVENT(vfio_ccw_fsm_async_request,
TP_PROTO(struct subchannel_id schid,
int command,
--
2.25.4