Re: [PATCH 09/15] vfio/ap: Use the new device life cycle helpers

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Reviewed-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>

On 8/27/22 1:10 PM, Kevin Tian wrote:
From: Yi Liu <yi.l.liu@xxxxxxxxx>

and manage available_instances inside @init/@release.

Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
Signed-off-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
  drivers/s390/crypto/vfio_ap_ops.c | 50 ++++++++++++++++++-------------
  1 file changed, 29 insertions(+), 21 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 6c8c41fac4e1..803aadfd0876 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -684,42 +684,44 @@ static bool vfio_ap_mdev_filter_matrix(unsigned long *apm, unsigned long *aqm,
  			     AP_DOMAINS);
  }
-static int vfio_ap_mdev_probe(struct mdev_device *mdev)
+static int vfio_ap_mdev_init_dev(struct vfio_device *vdev)
  {
-	struct ap_matrix_mdev *matrix_mdev;
-	int ret;
+	struct ap_matrix_mdev *matrix_mdev =
+		container_of(vdev, struct ap_matrix_mdev, vdev);
if ((atomic_dec_if_positive(&matrix_dev->available_instances) < 0))
  		return -EPERM;
- matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL);
-	if (!matrix_mdev) {
-		ret = -ENOMEM;
-		goto err_dec_available;
-	}
-	vfio_init_group_dev(&matrix_mdev->vdev, &mdev->dev,
-			    &vfio_ap_matrix_dev_ops);
-
-	matrix_mdev->mdev = mdev;
+	matrix_mdev->mdev = to_mdev_device(vdev->dev);
  	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
  	matrix_mdev->pqap_hook = handle_pqap;
  	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
  	hash_init(matrix_mdev->qtable.queues);
+ return 0;
+}
+
+static int vfio_ap_mdev_probe(struct mdev_device *mdev)
+{
+	struct ap_matrix_mdev *matrix_mdev;
+	int ret;
+
+	matrix_mdev = vfio_alloc_device(ap_matrix_mdev, vdev, &mdev->dev,
+					&vfio_ap_matrix_dev_ops);
+	if (IS_ERR(matrix_mdev))
+		return PTR_ERR(matrix_mdev);
+
  	ret = vfio_register_emulated_iommu_dev(&matrix_mdev->vdev);
  	if (ret)
-		goto err_list;
+		goto err_put_vdev;
  	dev_set_drvdata(&mdev->dev, matrix_mdev);
  	mutex_lock(&matrix_dev->mdevs_lock);
  	list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
  	mutex_unlock(&matrix_dev->mdevs_lock);
  	return 0;
-err_list:
-	vfio_uninit_group_dev(&matrix_mdev->vdev);
-	kfree(matrix_mdev);
-err_dec_available:
-	atomic_inc(&matrix_dev->available_instances);
+err_put_vdev:
+	vfio_put_device(&matrix_mdev->vdev);
  	return ret;
  }
@@ -766,6 +768,12 @@ static void vfio_ap_mdev_unlink_fr_queues(struct ap_matrix_mdev *matrix_mdev)
  	}
  }
+static void vfio_ap_mdev_release_dev(struct vfio_device *vdev)
+{
+	vfio_free_device(vdev);
+	atomic_inc(&matrix_dev->available_instances);
+}
+
  static void vfio_ap_mdev_remove(struct mdev_device *mdev)
  {
  	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(&mdev->dev);
@@ -779,9 +787,7 @@ static void vfio_ap_mdev_remove(struct mdev_device *mdev)
  	list_del(&matrix_mdev->node);
  	mutex_unlock(&matrix_dev->mdevs_lock);
  	mutex_unlock(&matrix_dev->guests_lock);
-	vfio_uninit_group_dev(&matrix_mdev->vdev);
-	kfree(matrix_mdev);
-	atomic_inc(&matrix_dev->available_instances);
+	vfio_put_device(&matrix_mdev->vdev);
  }
static ssize_t name_show(struct mdev_type *mtype,
@@ -1794,6 +1800,8 @@ static const struct attribute_group vfio_queue_attr_group = {
  };
static const struct vfio_device_ops vfio_ap_matrix_dev_ops = {
+	.init = vfio_ap_mdev_init_dev,
+	.release = vfio_ap_mdev_release_dev,
  	.open_device = vfio_ap_mdev_open_device,
  	.close_device = vfio_ap_mdev_close_device,
  	.ioctl = vfio_ap_mdev_ioctl,



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