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>

diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c
index d4119e4c4a8cc27cb15fdab60dacf1d8cbdef9de..23648a9aa7212e5813eeea55a3ef538e6a8f3d17 100644 (file)
--- a/drivers/s390/cio/vfio_ccw_fsm.c
+++ b/drivers/s390/cio/vfio_ccw_fsm.c
@@ -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);
 }
 
 /*

diff --git a/drivers/s390/cio/vfio_ccw_trace.c b/drivers/s390/cio/vfio_ccw_trace.c
index b37bc68e7f1858b4cface8ae804d30bc40a88bb9..37ecbf8be805934209869ab2badba621b531e287 100644 (file)
--- a/drivers/s390/cio/vfio_ccw_trace.c
+++ b/drivers/s390/cio/vfio_ccw_trace.c
@@ -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);

diff --git a/drivers/s390/cio/vfio_ccw_trace.h b/drivers/s390/cio/vfio_ccw_trace.h
index 5005d57901b4ecb2bd76d217451787b801596860..5f57cefa84dd78214316fcd5fdd89f85f61034b0 100644 (file)
--- 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_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),