From: Jan Glauber <jang@linux.vnet.ibm.com>
Date: Mon, 24 Oct 2011 09:47:54 +0000 (+0200)
Subject: [S390] qdio: add timestamp for last queue scan time
X-Git-Tag: next-20111025~94^2~13
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d4695f0e7dd4d11d93ad17da0a3450df9ee82016;p=karo-tx-linux.git

[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>
---

diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
index e5c966462c5a..a5dd0e640dec 100644
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -289,6 +289,9 @@ struct qdio_q {
 	/* error condition during a data transfer */
 	unsigned int qdio_error;
 
+	/* last scan of the queue */
+	u64 timestamp;
+
 	struct tasklet_struct tasklet;
 	struct qdio_queue_perf_stat q_stats;
 
@@ -437,6 +440,8 @@ static inline int shared_ind(u32 *dsci)
 	return dsci == &q_indicators[TIQDIO_SHARED_IND].ind;
 }
 
+extern u64 last_ai_time;
+
 /* prototypes for thin interrupt */
 void qdio_setup_thinint(struct qdio_irq *irq_ptr);
 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
diff --git a/drivers/s390/cio/qdio_debug.c b/drivers/s390/cio/qdio_debug.c
index 0e615cb912d0..7cc4a751331d 100644
--- a/drivers/s390/cio/qdio_debug.c
+++ b/drivers/s390/cio/qdio_debug.c
@@ -54,15 +54,17 @@ static int qstat_show(struct seq_file *m, void *v)
 	if (!q)
 		return 0;
 
-	seq_printf(m, "DSCI: %d   nr_used: %d\n",
-		   *(u32 *)q->irq_ptr->dsci, atomic_read(&q->nr_buf_used));
-	seq_printf(m, "ftc: %d  last_move: %d\n",
+	seq_printf(m, "Timestamp: %Lx  Last AI: %Lx\n",
+		   q->timestamp, last_ai_time);
+	seq_printf(m, "nr_used: %d  ftc: %d  last_move: %d\n",
+		   atomic_read(&q->nr_buf_used),
 		   q->first_to_check, q->last_move);
 	if (q->is_input_q) {
 		seq_printf(m, "polling: %d  ack start: %d  ack count: %d\n",
 			   q->u.in.polling, q->u.in.ack_start,
 			   q->u.in.ack_count);
-		seq_printf(m, "IRQs disabled: %u\n",
+		seq_printf(m, "DSCI: %d   IRQs disabled: %u\n",
+			   *(u32 *)q->irq_ptr->dsci,
 			   test_bit(QDIO_QUEUE_IRQS_DISABLED,
 			   &q->u.in.queue_irq_state));
 	}
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index d7b5f422d28a..e82d9367dff4 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -492,6 +492,8 @@ 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.
@@ -658,6 +660,8 @@ 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)) ||
diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c
index 2a1d4dfaf859..d4a5cd90716f 100644
--- a/drivers/s390/cio/qdio_thinint.c
+++ b/drivers/s390/cio/qdio_thinint.c
@@ -36,7 +36,7 @@ static u8 *tiqdio_alsi;
 
 struct indicator_t *q_indicators;
 
-static u64 last_ai_time;
+u64 last_ai_time;
 
 /* returns addr for the device state change indicator */
 static u32 *get_indicator(void)