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vfio-ccw: Add a trace for asynchronous requests 

Since the asynchronous requests are typically associated with
error recovery, let's add a simple trace when one of those is
issued to a device.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20191016142040.14132-4-farman@linux.ibm.com>
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Eric Farman 2019-10-16 16:20:39 +02:00 committed by Cornelia Huck
parent 970ebeb848
commit d5950b02b7
3 changed files with 35 additions and 0 deletions
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4
drivers/s390/cio/vfio_ccw_fsm.c
View File

@ -341,6 +341,10 @@ static void fsm_async_request(struct vfio_ccw_private *private,
/* should not happen? */
cmd_region->ret_code = -EINVAL;
}
trace_vfio_ccw_fsm_async_request(get_schid(private),
cmd_region->command,
cmd_region->ret_code);
}
/*

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

@ -9,5 +9,6 @@
#define CREATE_TRACE_POINTS
#include "vfio_ccw_trace.h"
EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_fsm_async_request);
EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_fsm_event);
EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_io_fctl);

30
drivers/s390/cio/vfio_ccw_trace.h
View File

@ -17,6 +17,36 @@
#include <linux/tracepoint.h>
TRACE_EVENT(vfio_ccw_fsm_async_request,
TP_PROTO(struct subchannel_id schid,
int command,
int errno),
TP_ARGS(schid, command, errno),
TP_STRUCT__entry(
__field(u8, cssid)
__field(u8, ssid)
__field(u16, sch_no)
__field(int, command)
__field(int, errno)
),
TP_fast_assign(
__entry->cssid = schid.cssid;
__entry->ssid = schid.ssid;
__entry->sch_no = schid.sch_no;
__entry->command = command;
__entry->errno = errno;
),
TP_printk("schid=%x.%x.%04x command=0x%x errno=%d",
__entry->cssid,
__entry->ssid,
__entry->sch_no,
__entry->command,
__entry->errno)
);
TRACE_EVENT(vfio_ccw_fsm_event,
TP_PROTO(struct subchannel_id schid, int state, int event),
TP_ARGS(schid, state, event),