[PATCH v2 06/13] vfio/ap_ops: Convert to use vfio_register_group_dev()

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This is straightforward conversion, the ap_matrix_mdev is actually serving
as the vfio_device and we can replace all the mdev_get_drvdata()'s with a
simple container_of().

Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
---
 drivers/s390/crypto/vfio_ap_ops.c     | 137 ++++++++++++++++----------
 drivers/s390/crypto/vfio_ap_private.h |   2 +
 2 files changed, 89 insertions(+), 50 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 0ce00c9311d378..79872c857dd522 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -24,8 +24,9 @@
 #define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"
 #define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device"
 
-static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev);
+static int vfio_ap_mdev_reset_queues(struct ap_matrix_mdev *matrix_mdev);
 static struct vfio_ap_queue *vfio_ap_find_queue(int apqn);
+static const struct vfio_device_ops vfio_ap_matrix_dev_ops;
 
 static int match_apqn(struct device *dev, const void *data)
 {
@@ -322,48 +323,63 @@ static void vfio_ap_matrix_init(struct ap_config_info *info,
 	matrix->adm_max = info->apxa ? info->Nd : 15;
 }
 
-static int vfio_ap_mdev_create(struct mdev_device *mdev)
+static int vfio_ap_mdev_probe(struct mdev_device *mdev)
 {
 	struct ap_matrix_mdev *matrix_mdev;
+	int ret;
 
 	if ((atomic_dec_if_positive(&matrix_dev->available_instances) < 0))
 		return -EPERM;
 
 	matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL);
 	if (!matrix_mdev) {
-		atomic_inc(&matrix_dev->available_instances);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto err_atomic;
 	}
+	vfio_init_group_dev(&matrix_mdev->vdev, &mdev->dev,
+			    &vfio_ap_matrix_dev_ops);
 
 	matrix_mdev->mdev = mdev;
 	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
-	mdev_set_drvdata(mdev, matrix_mdev);
 	matrix_mdev->pqap_hook.hook = handle_pqap;
 	matrix_mdev->pqap_hook.owner = THIS_MODULE;
 	mutex_lock(&matrix_dev->lock);
 	list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
 	mutex_unlock(&matrix_dev->lock);
 
+	ret = vfio_register_group_dev(&matrix_mdev->vdev);
+	if (ret)
+		goto err_list;
+	dev_set_drvdata(&mdev->dev, matrix_mdev);
 	return 0;
+
+err_list:
+	mutex_lock(&matrix_dev->lock);
+	list_del(&matrix_mdev->node);
+	mutex_unlock(&matrix_dev->lock);
+	kfree(matrix_mdev);
+err_atomic:
+	atomic_inc(&matrix_dev->available_instances);
+	return ret;
 }
 
-static int vfio_ap_mdev_remove(struct mdev_device *mdev)
+static void vfio_ap_mdev_remove(struct mdev_device *mdev)
 {
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(&mdev->dev);
 
-	if (matrix_mdev->kvm)
-		return -EBUSY;
+	/* FIXME: Remove isn't allowed to fail */
+	if (WARN_ON(matrix_mdev->kvm))
+		return;
+
+	vfio_unregister_group_dev(&matrix_mdev->vdev);
 
 	mutex_lock(&matrix_dev->lock);
-	vfio_ap_mdev_reset_queues(mdev);
+	vfio_ap_mdev_reset_queues(matrix_mdev);
 	list_del(&matrix_mdev->node);
 	mutex_unlock(&matrix_dev->lock);
 
 	kfree(matrix_mdev);
-	mdev_set_drvdata(mdev, NULL);
 	atomic_inc(&matrix_dev->available_instances);
-
-	return 0;
 }
 
 static ssize_t name_show(struct mdev_type *mtype,
@@ -605,8 +621,7 @@ static ssize_t assign_adapter_store(struct device *dev,
 {
 	int ret;
 	unsigned long apid;
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
 
 	/* If the guest is running, disallow assignment of adapter */
 	if (matrix_mdev->kvm)
@@ -671,8 +686,7 @@ static ssize_t unassign_adapter_store(struct device *dev,
 {
 	int ret;
 	unsigned long apid;
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
 
 	/* If the guest is running, disallow un-assignment of adapter */
 	if (matrix_mdev->kvm)
@@ -751,8 +765,7 @@ static ssize_t assign_domain_store(struct device *dev,
 {
 	int ret;
 	unsigned long apqi;
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
 	unsigned long max_apqi = matrix_mdev->matrix.aqm_max;
 
 	/* If the guest is running, disallow assignment of domain */
@@ -813,8 +826,7 @@ static ssize_t unassign_domain_store(struct device *dev,
 {
 	int ret;
 	unsigned long apqi;
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
 
 	/* If the guest is running, disallow un-assignment of domain */
 	if (matrix_mdev->kvm)
@@ -857,8 +869,7 @@ static ssize_t assign_control_domain_store(struct device *dev,
 {
 	int ret;
 	unsigned long id;
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
 
 	/* If the guest is running, disallow assignment of control domain */
 	if (matrix_mdev->kvm)
@@ -906,8 +917,7 @@ static ssize_t unassign_control_domain_store(struct device *dev,
 {
 	int ret;
 	unsigned long domid;
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
 	unsigned long max_domid =  matrix_mdev->matrix.adm_max;
 
 	/* If the guest is running, disallow un-assignment of control domain */
@@ -936,8 +946,7 @@ static ssize_t control_domains_show(struct device *dev,
 	int nchars = 0;
 	int n;
 	char *bufpos = buf;
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
 	unsigned long max_domid = matrix_mdev->matrix.adm_max;
 
 	mutex_lock(&matrix_dev->lock);
@@ -955,8 +964,7 @@ static DEVICE_ATTR_RO(control_domains);
 static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
 			   char *buf)
 {
-	struct mdev_device *mdev = mdev_from_dev(dev);
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(dev);
 	char *bufpos = buf;
 	unsigned long apid;
 	unsigned long apqi;
@@ -1085,7 +1093,7 @@ static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev)
 {
 	kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
 	matrix_mdev->kvm->arch.crypto.pqap_hook = NULL;
-	vfio_ap_mdev_reset_queues(matrix_mdev->mdev);
+	vfio_ap_mdev_reset_queues(matrix_mdev);
 	kvm_put_kvm(matrix_mdev->kvm);
 	matrix_mdev->kvm = NULL;
 }
@@ -1195,13 +1203,12 @@ int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q,
 	return ret;
 }
 
-static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
+static int vfio_ap_mdev_reset_queues(struct ap_matrix_mdev *matrix_mdev)
 {
 	int ret;
 	int rc = 0;
 	unsigned long apid, apqi;
 	struct vfio_ap_queue *q;
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
 
 	for_each_set_bit_inv(apid, matrix_mdev->matrix.apm,
 			     matrix_mdev->matrix.apm_max + 1) {
@@ -1222,9 +1229,10 @@ static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
 	return rc;
 }
 
-static int vfio_ap_mdev_open(struct mdev_device *mdev)
+static int vfio_ap_mdev_open(struct vfio_device *vdev)
 {
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev =
+		container_of(vdev, struct ap_matrix_mdev, vdev);
 	unsigned long events;
 	int ret;
 
@@ -1235,7 +1243,7 @@ static int vfio_ap_mdev_open(struct mdev_device *mdev)
 	matrix_mdev->group_notifier.notifier_call = vfio_ap_mdev_group_notifier;
 	events = VFIO_GROUP_NOTIFY_SET_KVM;
 
-	ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
+	ret = vfio_register_notifier(vdev->dev, VFIO_GROUP_NOTIFY,
 				     &events, &matrix_mdev->group_notifier);
 	if (ret) {
 		module_put(THIS_MODULE);
@@ -1244,29 +1252,30 @@ static int vfio_ap_mdev_open(struct mdev_device *mdev)
 
 	matrix_mdev->iommu_notifier.notifier_call = vfio_ap_mdev_iommu_notifier;
 	events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
-	ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
+	ret = vfio_register_notifier(vdev->dev, VFIO_IOMMU_NOTIFY,
 				     &events, &matrix_mdev->iommu_notifier);
 	if (!ret)
 		return ret;
 
-	vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
+	vfio_unregister_notifier(vdev->dev, VFIO_GROUP_NOTIFY,
 				 &matrix_mdev->group_notifier);
 	module_put(THIS_MODULE);
 	return ret;
 }
 
-static void vfio_ap_mdev_release(struct mdev_device *mdev)
+static void vfio_ap_mdev_release(struct vfio_device *vdev)
 {
-	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+	struct ap_matrix_mdev *matrix_mdev =
+		container_of(vdev, struct ap_matrix_mdev, vdev);
 
 	mutex_lock(&matrix_dev->lock);
 	if (matrix_mdev->kvm)
 		vfio_ap_mdev_unset_kvm(matrix_mdev);
 	mutex_unlock(&matrix_dev->lock);
 
-	vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
+	vfio_unregister_notifier(vdev->dev, VFIO_IOMMU_NOTIFY,
 				 &matrix_mdev->iommu_notifier);
-	vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
+	vfio_unregister_notifier(vdev->dev, VFIO_GROUP_NOTIFY,
 				 &matrix_mdev->group_notifier);
 	module_put(THIS_MODULE);
 }
@@ -1291,9 +1300,11 @@ static int vfio_ap_mdev_get_device_info(unsigned long arg)
 	return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
 }
 
-static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
+static ssize_t vfio_ap_mdev_ioctl(struct vfio_device *vdev,
 				    unsigned int cmd, unsigned long arg)
 {
+	struct ap_matrix_mdev *matrix_mdev =
+		container_of(vdev, struct ap_matrix_mdev, vdev);
 	int ret;
 
 	mutex_lock(&matrix_dev->lock);
@@ -1302,7 +1313,7 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
 		ret = vfio_ap_mdev_get_device_info(arg);
 		break;
 	case VFIO_DEVICE_RESET:
-		ret = vfio_ap_mdev_reset_queues(mdev);
+		ret = vfio_ap_mdev_reset_queues(matrix_mdev);
 		break;
 	default:
 		ret = -EOPNOTSUPP;
@@ -1313,25 +1324,51 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
 	return ret;
 }
 
+static const struct vfio_device_ops vfio_ap_matrix_dev_ops = {
+	.open = vfio_ap_mdev_open,
+	.release = vfio_ap_mdev_release,
+	.ioctl = vfio_ap_mdev_ioctl,
+};
+
+static struct mdev_driver vfio_ap_matrix_driver = {
+	.driver = {
+		.name = "vfio_ap_mdev",
+		.owner = THIS_MODULE,
+		.mod_name = KBUILD_MODNAME,
+		.dev_groups = vfio_ap_mdev_attr_groups,
+	},
+	.probe = vfio_ap_mdev_probe,
+	.remove = vfio_ap_mdev_remove,
+};
+
 static const struct mdev_parent_ops vfio_ap_matrix_ops = {
 	.owner			= THIS_MODULE,
+	.device_driver		= &vfio_ap_matrix_driver,
 	.supported_type_groups	= vfio_ap_mdev_type_groups,
-	.mdev_attr_groups	= vfio_ap_mdev_attr_groups,
-	.create			= vfio_ap_mdev_create,
-	.remove			= vfio_ap_mdev_remove,
-	.open			= vfio_ap_mdev_open,
-	.release		= vfio_ap_mdev_release,
-	.ioctl			= vfio_ap_mdev_ioctl,
 };
 
 int vfio_ap_mdev_register(void)
 {
+	int ret;
+
 	atomic_set(&matrix_dev->available_instances, MAX_ZDEV_ENTRIES_EXT);
 
-	return mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
+	ret = mdev_register_driver(&vfio_ap_matrix_driver);
+	if (ret)
+		return ret;
+
+	ret = mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
+	if (ret)
+		goto err_driver;
+	return 0;
+
+err_driver:
+	mdev_unregister_driver(&vfio_ap_matrix_driver);
+	return ret;
 }
 
 void vfio_ap_mdev_unregister(void)
 {
 	mdev_unregister_device(&matrix_dev->device);
+	mdev_unregister_driver(&vfio_ap_matrix_driver);
 }
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index 28e9d998976820..b95ba674f60b1b 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -18,6 +18,7 @@
 #include <linux/delay.h>
 #include <linux/mutex.h>
 #include <linux/kvm_host.h>
+#include <linux/vfio.h>
 
 #include "ap_bus.h"
 
@@ -79,6 +80,7 @@ struct ap_matrix {
  * @kvm:	the struct holding guest's state
  */
 struct ap_matrix_mdev {
+	struct vfio_device vdev;
 	struct list_head node;
 	struct ap_matrix matrix;
 	struct notifier_block group_notifier;
-- 
2.31.1




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