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s390/ap: Fix wrong APQN fill calculation

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The upper limit of the firmware queue fill state for each APQN
is reported by the hwinfo.qd field. This field shows the
numbers 0-7 for 1-8 queue spaces available. But the exploiting
code assumed the real boundary is stored there and thus stoppes
queuing in messages one tick too early.

Correct the limit calculation and thus offer a boost
of 12.5% performance for high traffic on one APQN.

Fixes: d4c53ae8e4 ("s390/ap: store TAPQ hwinfo in struct ap_card")
Cc: stable@vger.kernel.org
Reported-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Harald Freudenberger
2026-01-19 10:37:28 +01:00
committed by Heiko Carstens
parent d045e166d3
commit 3317785a88
2 changed files with 2 additions and 2 deletions
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2
drivers/s390/crypto/ap_card.c
View File

@@ -43,7 +43,7 @@ static ssize_t depth_show(struct device *dev, struct device_attribute *attr,
{
struct ap_card *ac = to_ap_card(dev);
return sysfs_emit(buf, "%d\n", ac->hwinfo.qd);
return sysfs_emit(buf, "%d\n", ac->hwinfo.qd + 1);
}
static DEVICE_ATTR_RO(depth);

2
drivers/s390/crypto/ap_queue.c
View File

@@ -285,7 +285,7 @@ static enum ap_sm_wait ap_sm_write(struct ap_queue *aq)
list_move_tail(&ap_msg->list, &aq->pendingq);
aq->requestq_count--;
aq->pendingq_count++;
if (aq->queue_count < aq->card->hwinfo.qd) {
if (aq->queue_count < aq->card->hwinfo.qd + 1) {
aq->sm_state = AP_SM_STATE_WORKING;
return AP_SM_WAIT_AGAIN;
}