[S390] qdio: add timestamp for last queue scan time

Add a timestamp per queue and update the timestamp when the queue is
scanned. Add the queue timestamps and the timestamp of the last
adapter interrupt to the debugfs output. The timestamps are useful
for debugging stall conditions.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 7ded1b26fd25..a76d6764ce67 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -512,6 +512,8 @@ static int get_inbound_buffer_frontier(struct qdio_q *q)
         int count, stop;
         unsigned char state = 0;
 
+        q->timestamp = get_clock_fast();
+
         /*
          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
          * would return 0.
@@ -781,6 +783,8 @@ static int get_outbound_buffer_frontier(struct qdio_q *q)
         int count, stop;
         unsigned char state = 0;
 
+        q->timestamp = get_clock_fast();
+
         if (need_siga_sync(q))
                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
                     !pci_out_supported(q)) ||