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vfio-ccw: Trace the FSM jumptable

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It would be nice if we could track the sequence of events within
vfio-ccw, based on the state of the device/FSM and our calling
sequence within it.  So let's add a simple trace here so we can
watch the states change as things go, and allow it to be folded
into the rest of the other cio traces.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20191016142040.14132-3-farman@linux.ibm.com>
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Eric Farman 2019-10-16 16:20:38 +02:00 committed by Cornelia Huck
parent 7af52cca6f
commit 970ebeb848
3 changed files with 28 additions and 0 deletions
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1
drivers/s390/cio/vfio_ccw_private.h
View File

@ -135,6 +135,7 @@ extern fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS];
static inline void vfio_ccw_fsm_event(struct vfio_ccw_private *private,
int event)
{
trace_vfio_ccw_fsm_event(private->sch->schid, private->state, event);
vfio_ccw_jumptable[private->state][event](private, event);
}

1
drivers/s390/cio/vfio_ccw_trace.c
View File

@ -9,4 +9,5 @@
#define CREATE_TRACE_POINTS
#include "vfio_ccw_trace.h"
EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_fsm_event);
EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_io_fctl);

26
drivers/s390/cio/vfio_ccw_trace.h
View File

@ -17,6 +17,32 @@
#include <linux/tracepoint.h>
TRACE_EVENT(vfio_ccw_fsm_event,
TP_PROTO(struct subchannel_id schid, int state, int event),
TP_ARGS(schid, state, event),
TP_STRUCT__entry(
__field(u8, cssid)
__field(u8, ssid)
__field(u16, schno)
__field(int, state)
__field(int, event)
),
TP_fast_assign(
__entry->cssid = schid.cssid;
__entry->ssid = schid.ssid;
__entry->schno = schid.sch_no;
__entry->state = state;
__entry->event = event;
),
TP_printk("schid=%x.%x.%04x state=%d event=%d",
__entry->cssid, __entry->ssid, __entry->schno,
__entry->state,
__entry->event)
);
TRACE_EVENT(vfio_ccw_io_fctl,
TP_PROTO(int fctl, struct subchannel_id schid, int errno, char *errstr),
TP_ARGS(fctl, schid, errno, errstr),