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authorJan Glauber <jang@linux.vnet.ibm.com>2011-10-30 15:17:05 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-10-30 15:16:45 +0100
commita2b86019826cb97fd964fbaf101410c64cd78681 (patch)
treeda7659c2d90dcfd83d23ba3f432baa9f84aa80a2 /drivers/s390
parent80376f347d70ce5fcfb98105d83624518e0911d6 (diff)
downloadop-kernel-dev-a2b86019826cb97fd964fbaf101410c64cd78681.zip
op-kernel-dev-a2b86019826cb97fd964fbaf101410c64cd78681.tar.gz
[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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/qdio.h5
-rw-r--r--drivers/s390/cio/qdio_debug.c10
-rw-r--r--drivers/s390/cio/qdio_main.c4
-rw-r--r--drivers/s390/cio/qdio_thinint.c2
4 files changed, 16 insertions, 5 deletions
diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
index 3dd8644..c15624b 100644
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -290,6 +290,9 @@ 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;
@@ -449,6 +452,8 @@ static inline int shared_ind(struct qdio_q *q)
return references_shared_dsci(i) || has_multiple_inq_on_dsci(i);
}
+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 aaf7f93..ed68245 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 7ded1b2..a76d676 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)) ||
diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c
index a3e3949..8c1f412 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)
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