diff options
| author | Eric Farman <farman@linux.ibm.com> | 2019-10-16 16:20:38 +0200 |
|---|---|---|
| committer | Cornelia Huck <cohuck@redhat.com> | 2019-10-17 11:36:29 +0200 |
| commit | 970ebeb84880906b396e53539b95fdbbf3e786a2 (patch) | |
| tree | 6e87139dca24afefff99ed75563c0c0cc382c4c8 /drivers/s390 | |
| parent | 7af52cca6f1c4d785b652682a8f7687df1061318 (diff) | |
vfio-ccw: Trace the FSM jumptable
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>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/vfio_ccw_private.h | 1 | ||||
| -rw-r--r-- | drivers/s390/cio/vfio_ccw_trace.c | 1 | ||||
| -rw-r--r-- | drivers/s390/cio/vfio_ccw_trace.h | 26 |
3 files changed, 28 insertions, 0 deletions
diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h index bbe9babf767b..9b9bb4982972 100644 --- a/drivers/s390/cio/vfio_ccw_private.h +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -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); } diff --git a/drivers/s390/cio/vfio_ccw_trace.c b/drivers/s390/cio/vfio_ccw_trace.c index d5cc943c6864..b37bc68e7f18 100644 --- a/drivers/s390/cio/vfio_ccw_trace.c +++ b/drivers/s390/cio/vfio_ccw_trace.c @@ -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); diff --git a/drivers/s390/cio/vfio_ccw_trace.h b/drivers/s390/cio/vfio_ccw_trace.h index 2a2937a40124..5005d57901b4 100644 --- a/drivers/s390/cio/vfio_ccw_trace.h +++ b/drivers/s390/cio/vfio_ccw_trace.h @@ -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), |