qdio: extend API to allow polling
Extend the qdio API to allow polling in the upper-layer driver. This
is needed by qeth to use NAPI.
To use the new interface the upper-layer driver must specify the
queue_start_poll(). This callback is used to signal the upper-layer
driver that is has initiative and must process the inbound queue by
calling qdio_get_next_buffers(). If the upper-layer driver wants to
stop polling it calls qdio_start_irq().
Since adapter interrupts are not completely stoppable qdio implements
a software bit QDIO_QUEUE_IRQS_DISABLED to safely disable interrupts for an
input queue.
The old interface is preserved and will be used as is by zfcp.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/s390/cio/qdio_debug.c b/drivers/s390/cio/qdio_debug.c
index 6ce83f5..28868e7 100644
--- a/drivers/s390/cio/qdio_debug.c
+++ b/drivers/s390/cio/qdio_debug.c
@@ -56,9 +56,16 @@
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", q->first_to_check, q->last_move);
- 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, "ftc: %d last_move: %d\n",
+ 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",
+ test_bit(QDIO_QUEUE_IRQS_DISABLED,
+ &q->u.in.queue_irq_state));
+ }
seq_printf(m, "SBAL states:\n");
seq_printf(m, "|0 |8 |16 |24 |32 |40 |48 |56 63|\n");
@@ -113,22 +120,6 @@
return 0;
}
-static ssize_t qstat_seq_write(struct file *file, const char __user *buf,
- size_t count, loff_t *off)
-{
- struct seq_file *seq = file->private_data;
- struct qdio_q *q = seq->private;
-
- if (!q)
- return 0;
- if (q->is_input_q)
- xchg(q->irq_ptr->dsci, 1);
- local_bh_disable();
- tasklet_schedule(&q->tasklet);
- local_bh_enable();
- return count;
-}
-
static int qstat_seq_open(struct inode *inode, struct file *filp)
{
return single_open(filp, qstat_show,
@@ -139,7 +130,6 @@
.owner = THIS_MODULE,
.open = qstat_seq_open,
.read = seq_read,
- .write = qstat_seq_write,
.llseek = seq_lseek,
.release = single_release,
};
@@ -166,7 +156,8 @@
"QEBSM eqbs",
"QEBSM eqbs partial",
"QEBSM sqbs",
- "QEBSM sqbs partial"
+ "QEBSM sqbs partial",
+ "Discarded interrupts"
};
static int qperf_show(struct seq_file *m, void *v)