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authorJan Glauber <jang@linux.vnet.ibm.com>2009-03-26 15:24:28 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-03-26 15:24:21 +0100
commit3fdf1e18cbc7c58f2d5604315ddae3596725bc6a (patch)
treeb5c145145d55b278b7ae4fcbf544518895a00ca7 /drivers/s390/cio
parent700e982f28f5e13cef8eea93ac8c6702f699d894 (diff)
[S390] qdio: move ACK to newest buffer for devices without QEBSM
The ACKnowledgement state should be set on the newest SBAL so an adapter interrupt surpression check needs to scan fewer SBALs. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio')
-rw-r--r--drivers/s390/cio/qdio_main.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 8e6bc9cddfa..61ba765936a 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -440,12 +440,16 @@ static inline void inbound_primed(struct qdio_q *q, int count)
/* reset the previous ACK but first set the new one */
set_buf_state(q, new, SLSB_P_INPUT_ACK);
set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT);
- }
- else {
+ } else {
q->u.in.polling = 1;
- set_buf_state(q, q->first_to_check, SLSB_P_INPUT_ACK);
+ set_buf_state(q, new, SLSB_P_INPUT_ACK);
}
+ /*
+ * last_move_ftc points to the ACK'ed buffer and not to the last turns
+ * first_to_check like for qebsm. Since it is only used to check if
+ * the queue front moved in qdio_inbound_q_done this is not a problem.
+ */
q->last_move_ftc = new;
count--;
if (!count)
@@ -455,7 +459,7 @@ static inline void inbound_primed(struct qdio_q *q, int count)
* Need to change all PRIMED buffers to NOT_INIT, otherwise
* we're loosing initiative in the thinint code.
*/
- set_buf_states(q, next_buf(q->first_to_check), SLSB_P_INPUT_NOT_INIT,
+ set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT,
count);
}
@@ -1480,7 +1484,6 @@ static void handle_inbound(struct qdio_q *q, unsigned int callflags,
if (q->u.in.ack_count <= 0) {
q->u.in.polling = 0;
q->u.in.ack_count = 0;
- /* TODO: must we set last_move_ftc to something meaningful? */
goto set;
}
q->last_move_ftc = add_buf(q->last_move_ftc, diff);