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s390/vfio-ap: wait for response code 05 to clear on queue reset

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Response code 05, AP busy, is a valid response code for a ZAPQ or TAPQ.
Instead of returning error -EIO when a ZAPQ fails with response code 05,
let's wait until the queue is no longer busy and try the ZAPQ again.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Tested-by: Viktor Mihajlovski <mihajlov@linux.ibm.com>
Link: https://lore.kernel.org/r/20230815184333.6554-4-akrowiak@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Tony Krowiak 2023-08-15 14:43:24 -04:00 committed by Heiko Carstens
parent 7aa7b2a80c
commit 411b0109da
1 changed files with 2 additions and 0 deletions
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2
drivers/s390/crypto/vfio_ap_ops.c
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@ -1611,6 +1611,7 @@ static int apq_status_check(int apqn, struct ap_queue_status *status)
case AP_RESPONSE_DECONFIGURED:
return 0;
case AP_RESPONSE_RESET_IN_PROGRESS:
case AP_RESPONSE_BUSY:
return -EBUSY;
default:
WARN(true,
@ -1663,6 +1664,7 @@ retry_zapq:
}
break;
case AP_RESPONSE_RESET_IN_PROGRESS:
case AP_RESPONSE_BUSY:
/*
* There is a reset issued by another process in progress. Let's wait
* for that to complete. Since we have no idea whether it was a RAPQ or