linux-kernel - [PATCH v2 6/6] s390/vfio_ap: increase max wait time for reset verification

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Message-Id: <20230118203111.529766-7-akrowiak@linux.ibm.com>
Date:   Wed, 18 Jan 2023 15:31:11 -0500
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     jjherne@...ux.ibm.com, freude@...ux.ibm.com,
        borntraeger@...ibm.com, pasic@...ux.ibm.com
Subject: [PATCH v2 6/6] s390/vfio_ap: increase max wait time for reset verification

Increase the maximum time to wait for verification of a queue reset
operation to 200ms.

Signed-off-by: Tony Krowiak <akrowiak@...ux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@...ux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@...ux.ibm.com>
---
 drivers/s390/crypto/vfio_ap_ops.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 68be34362680..d665e1bc494a 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -30,6 +30,9 @@
 #define AP_QUEUE_UNASSIGNED "unassigned"
 #define AP_QUEUE_IN_USE "in use"
 
+#define MAX_RESET_CHECK_WAIT	200	/* Sleep max 200ms for reset check	*/
+#define AP_RESET_INTERVAL		20	/* Reset sleep interval (20ms)		*/
+
 static int vfio_ap_mdev_reset_queues(struct ap_queue_table *qtable);
 static struct vfio_ap_queue *vfio_ap_find_queue(int apqn);
 static const struct vfio_device_ops vfio_ap_matrix_dev_ops;
@@ -1626,11 +1629,12 @@ static int apq_status_check(int apqn, struct ap_queue_status *status)
 
 static int apq_reset_check(struct vfio_ap_queue *q)
 {
-	int iters = 2, ret;
+	int ret;
+	int iters = MAX_RESET_CHECK_WAIT / AP_RESET_INTERVAL;
 	struct ap_queue_status status;
 
-	while (iters--) {
-		msleep(20);
+	for (; iters > 0; iters--) {
+		msleep(AP_RESET_INTERVAL);
 		status = ap_tapq(q->apqn, NULL);
 		ret = apq_status_check(q->apqn, &status);
 		if (ret != -EBUSY)
-- 
2.31.1