diff options
| author | Tony Krowiak <akrowiak@linux.ibm.com> | 2023-01-18 23:31:08 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2023-01-22 20:42:36 +0300 |
| commit | 3ba41768105c70faa1e1677c173a9eedc31c5094 (patch) | |
| tree | df313c44f612285f607b1e1022f89b9a18ad367e /drivers | |
| parent | 0daf9878a7990058e74025493820bce0f67654c4 (diff) | |
| download | linux-3ba41768105c70faa1e1677c173a9eedc31c5094.tar.xz | |
s390/vfio_ap: use TAPQ to verify reset in progress completes
To eliminate the repeated calls to the PQAP(ZAPQ) function to verify that
a reset in progress completed successfully and ensure that error response
codes get appropriately logged, let's call the apq_reset_check() function
when the ZAPQ response code indicates that a reset that is already in
progress.
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Link: https://lore.kernel.org/r/20230118203111.529766-4-akrowiak@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/crypto/vfio_ap_ops.c | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 7031e360411b..bc9a814e6508 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -33,7 +33,7 @@ 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; -static int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q, unsigned int retry); +static int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q); /** * get_update_locks_for_kvm: Acquire the locks required to dynamically update a @@ -1643,8 +1643,7 @@ static int apq_reset_check(struct vfio_ap_queue *q) return ret; } -static int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q, - unsigned int retry) +static int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q) { struct ap_queue_status status; int ret; @@ -1659,12 +1658,15 @@ retry_zapq: ret = 0; break; case AP_RESPONSE_RESET_IN_PROGRESS: - if (retry--) { - msleep(20); - goto retry_zapq; - } - ret = -EBUSY; - break; + /* + * 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 + * ZAPQ, then if it completes successfully, let's issue the ZAPQ. + */ + ret = apq_reset_check(q); + if (ret) + break; + goto retry_zapq; case AP_RESPONSE_Q_NOT_AVAIL: case AP_RESPONSE_DECONFIGURED: case AP_RESPONSE_CHECKSTOPPED: @@ -1699,7 +1701,7 @@ static int vfio_ap_mdev_reset_queues(struct ap_queue_table *qtable) struct vfio_ap_queue *q; hash_for_each(qtable->queues, loop_cursor, q, mdev_qnode) { - ret = vfio_ap_mdev_reset_queue(q, 1); + ret = vfio_ap_mdev_reset_queue(q); /* * Regardless whether a queue turns out to be busy, or * is not operational, we need to continue resetting @@ -1950,7 +1952,7 @@ void vfio_ap_mdev_remove_queue(struct ap_device *apdev) } } - vfio_ap_mdev_reset_queue(q, 1); + vfio_ap_mdev_reset_queue(q); dev_set_drvdata(&apdev->device, NULL); kfree(q); release_update_locks_for_mdev(matrix_mdev); |