linux-kernel - Re: [PATCH 6/7] s390/vfio_ap: increase max wait time for reset verification

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Date:   Tue, 20 Dec 2022 09:27:02 -0500
From:   Anthony Krowiak <akrowiak@...ux.ibm.com>
To:     freude@...ux.ibm.com
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, jjherne@...ux.ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, mjrosato@...ux.ibm.com, pasic@...ux.ibm.com,
        alex.williamson@...hat.com, kwankhede@...dia.com,
        fiuczy@...ux.ibm.com
Subject: Re: [PATCH 6/7] s390/vfio_ap: increase max wait time for reset
 verification


On 12/15/22 5:58 AM, Harald Freudenberger wrote:
> On 2022-12-13 16:44, Tony Krowiak wrote:
>> Increase the maximum time to wait for verification of a queue reset
>> operation to 200ms.
>>
>> Signed-off-by: Tony Krowiak <akrowiak@...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 dbf681715a6d..e80c5a6b91be 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;
>> @@ -1615,11 +1618,12 @@ 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)
>
> Reviewed-by: Harald Freudenberger <freude@...ux.ibm.com>


Thanks for the review.