Commit 970ebeb8 authored by Eric Farman's avatar Eric Farman Committed by Cornelia Huck
Browse files

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: default avatarEric Farman <farman@linux.ibm.com>
Reviewed-by: default avatarCornelia Huck <cohuck@redhat.com>
Message-Id: <20191016142040.14132-3-farman@linux.ibm.com>
Acked-by: default avatarHalil Pasic <pasic@linux.ibm.com>
Signed-off-by: default avatarCornelia Huck <cohuck@redhat.com>
parent 7af52cca

drivers/s390/cio/vfio_ccw_private.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

}

drivers/s390/cio/vfio_ccw_trace.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

drivers/s390/cio/vfio_ccw_trace.h

+26 −0
Original line number Diff line number Diff line
@@ -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),

CRA Git | Maintained and supported by SUSTech CRA and CCSE