[PATCH v4 1/7] s390: vfio-ap: Refactor vfio_ap driver probe and remove callbacks

[Tony Krowiak <akrowiak@xxxxxxxxxxxxx>]

In order to limit the number of private mdev functions called from the
vfio_ap device driver as well as to provide a landing spot for dynamic
configuration code related to binding/unbinding AP queue devices to/from
the vfio_ap driver, the following changes are being introduced:

* Move code from the vfio_ap driver's probe callback into a function
  defined in the mdev private operations file.

* Move code from the vfio_ap driver's remove callback into a function
  defined in the mdev private operations file.

Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
---
 drivers/s390/crypto/vfio_ap_drv.c     | 27 ++++++++++-----------------
 drivers/s390/crypto/vfio_ap_ops.c     | 28 ++++++++++++++++++++++++++++
 drivers/s390/crypto/vfio_ap_private.h |  6 +++---
 3 files changed, 41 insertions(+), 20 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
index 003662aa8060..3c60df70891b 100644
--- a/drivers/s390/crypto/vfio_ap_drv.c
+++ b/drivers/s390/crypto/vfio_ap_drv.c
@@ -49,15 +49,15 @@ MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);
  */
 static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
 {
-	struct vfio_ap_queue *q;
-
-	q = kzalloc(sizeof(*q), GFP_KERNEL);
-	if (!q)
-		return -ENOMEM;
-	dev_set_drvdata(&apdev->device, q);
-	q->apqn = to_ap_queue(&apdev->device)->qid;
-	q->saved_isc = VFIO_AP_ISC_INVALID;
+	int ret;
+	struct ap_queue *queue = to_ap_queue(&apdev->device);
+
+	ret = vfio_ap_mdev_probe_queue(queue);
+	if (ret)
+		return ret;
+
 	return 0;
+
 }
 
 /**
@@ -68,17 +68,10 @@ static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
  */
 static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
 {
-	struct vfio_ap_queue *q;
-	int apid, apqi;
+	struct ap_queue *queue = to_ap_queue(&apdev->device);
 
 	mutex_lock(&matrix_dev->lock);
-	q = dev_get_drvdata(&apdev->device);
-	dev_set_drvdata(&apdev->device, NULL);
-	apid = AP_QID_CARD(q->apqn);
-	apqi = AP_QID_QUEUE(q->apqn);
-	vfio_ap_mdev_reset_queue(apid, apqi, 1);
-	vfio_ap_irq_disable(q);
-	kfree(q);
+	vfio_ap_mdev_remove_queue(queue);
 	mutex_unlock(&matrix_dev->lock);
 }
 
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 015174ff6f0a..bf2ab02b9a0b 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1302,3 +1302,31 @@ void vfio_ap_mdev_unregister(void)
 {
 	mdev_unregister_device(&matrix_dev->device);
 }
+
+int vfio_ap_mdev_probe_queue(struct ap_queue *queue)
+{
+	struct vfio_ap_queue *q;
+
+	q = kzalloc(sizeof(*q), GFP_KERNEL);
+	if (!q)
+		return -ENOMEM;
+	dev_set_drvdata(&queue->ap_dev.device, q);
+	q->apqn = queue->qid;
+	q->saved_isc = VFIO_AP_ISC_INVALID;
+
+	return 0;
+}
+
+void vfio_ap_mdev_remove_queue(struct ap_queue *queue)
+{
+	struct vfio_ap_queue *q;
+	int apid, apqi;
+
+	q = dev_get_drvdata(&queue->ap_dev.device);
+	dev_set_drvdata(&queue->ap_dev.device, NULL);
+	apid = AP_QID_CARD(q->apqn);
+	apqi = AP_QID_QUEUE(q->apqn);
+	vfio_ap_mdev_reset_queue(apid, apqi, 1);
+	vfio_ap_irq_disable(q);
+	kfree(q);
+}
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index f46dde56b464..5cc3c2ebf151 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -90,8 +90,6 @@ struct ap_matrix_mdev {
 
 extern int vfio_ap_mdev_register(void);
 extern void vfio_ap_mdev_unregister(void);
-int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
-			     unsigned int retry);
 
 struct vfio_ap_queue {
 	struct ap_matrix_mdev *matrix_mdev;
@@ -100,5 +98,7 @@ struct vfio_ap_queue {
 #define VFIO_AP_ISC_INVALID 0xff
 	unsigned char saved_isc;
 };
-struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q);
+int vfio_ap_mdev_probe_queue(struct ap_queue *queue);
+void vfio_ap_mdev_remove_queue(struct ap_queue *queue);
+
 #endif /* _VFIO_AP_PRIVATE_H_ */
-- 
2.7.4