[PATCH v4 09/15] vfio/ap: Use the new device life cycle helpers

Kevin Tian
2022-09-21T03:28:20Z

From: Yi Liu <yi.l.liu@intel.com>

and manage available_instances inside @init/@release.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
---
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..161597357a64 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)
+{
+ atomic_inc(&matrix_dev->available_instances);
+ vfio_free_device(vdev);
+}
+
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,
--
2.21.3