vdpa_sim_blk: add support for vdpa management tool

stable inclusion
from stable-v5.13
commit 899c4d18
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5WXCZ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=899c4d187f6a5c11d8eae33506fa0736dbabc39f

----------------------------------------------------------------------

Enable the user to create vDPA block simulator devices using the
vdpa management tool:

    # Show vDPA supported devices
    $ vdpa mgmtdev show
    vdpasim_blk:
      supported_classes block

    # Create a vDPA block device named as 'blk0' from the management
    # device vdpasim:
    $ vdpa dev add mgmtdev vdpasim_blk name blk0

    # Show the info of the 'blk0' device just created
    $ vdpa dev show blk0 -jp
    {
        "dev": {
            "blk0": {
                "type": "block",
                "mgmtdev": "vdpasim_blk",
                "vendor_id": 0,
                "max_vqs": 1,
                "max_vq_size": 256
            }
        }
    }

    # Delete the vDPA device after its use
    $ vdpa dev del blk0
Signed-off-by: NStefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20210315163450.254396-15-sgarzare@redhat.comSigned-off-by: NMichael S. Tsirkin <mst@redhat.com>
Acked-by: NJason Wang <jasowang@redhat.com>
Signed-off-by: NPengyuan Zhao <zhaopengyuan@hisilicon.com>

drivers/vdpa/vdpa_sim/vdpa_sim_blk.c

@@ -35,8 +35,6 @@
 #define VDPASIM_BLK_SEG_MAX	32
 #define VDPASIM_BLK_VQ_NUM	1
 
-static struct vdpasim *vdpasim_blk_dev;
-
 static void vdpasim_blk_work(struct work_struct *work)
 {
 	struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
@@ -98,11 +96,23 @@ static void vdpasim_blk_get_config(struct vdpasim *vdpasim, void *config)
 	blk_config->blk_size = cpu_to_vdpasim32(vdpasim, SECTOR_SIZE);
 }
 
-static int __init vdpasim_blk_init(void)
+static void vdpasim_blk_mgmtdev_release(struct device *dev)
+{
+}
+
+static struct device vdpasim_blk_mgmtdev = {
+	.init_name = "vdpasim_blk",
+	.release = vdpasim_blk_mgmtdev_release,
+};
+
+static int vdpasim_blk_dev_add(struct vdpa_mgmt_dev *mdev, const char *name)
 {
 	struct vdpasim_dev_attr dev_attr = {};
+	struct vdpasim *simdev;
 	int ret;
 
+	dev_attr.mgmt_dev = mdev;
+	dev_attr.name = name;
 	dev_attr.id = VIRTIO_ID_BLOCK;
 	dev_attr.supported_features = VDPASIM_BLK_FEATURES;
 	dev_attr.nvqs = VDPASIM_BLK_VQ_NUM;
@@ -111,29 +121,68 @@ static int __init vdpasim_blk_init(void)
 	dev_attr.work_fn = vdpasim_blk_work;
 	dev_attr.buffer_size = PAGE_SIZE;
 
-	vdpasim_blk_dev = vdpasim_create(&dev_attr);
-	if (IS_ERR(vdpasim_blk_dev)) {
-		ret = PTR_ERR(vdpasim_blk_dev);
-		goto out;
-	}
+	simdev = vdpasim_create(&dev_attr);
+	if (IS_ERR(simdev))
+		return PTR_ERR(simdev);
 
-	ret = vdpa_register_device(&vdpasim_blk_dev->vdpa, VDPASIM_BLK_VQ_NUM);
+	ret = vdpa_register_device(&simdev->vdpa, VDPASIM_BLK_VQ_NUM);
 	if (ret)
 		goto put_dev;
 
 	return 0;
 
 put_dev:
-	put_device(&vdpasim_blk_dev->vdpa.dev);
-out:
+	put_device(&simdev->vdpa.dev);
 	return ret;
 }
 
-static void __exit vdpasim_blk_exit(void)
+static void vdpasim_blk_dev_del(struct vdpa_mgmt_dev *mdev,
+				struct vdpa_device *dev)
 {
-	struct vdpa_device *vdpa = &vdpasim_blk_dev->vdpa;
+	struct vdpasim *simdev = container_of(dev, struct vdpasim, vdpa);
+
+	_vdpa_unregister_device(&simdev->vdpa);
+}
+
+static const struct vdpa_mgmtdev_ops vdpasim_blk_mgmtdev_ops = {
+       .dev_add = vdpasim_blk_dev_add,
+       .dev_del = vdpasim_blk_dev_del
+};
 
-	vdpa_unregister_device(vdpa);
+static struct virtio_device_id id_table[] = {
+       { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
+       { 0 },
+};
+
+static struct vdpa_mgmt_dev mgmt_dev = {
+       .device = &vdpasim_blk_mgmtdev,
+       .id_table = id_table,
+       .ops = &vdpasim_blk_mgmtdev_ops,
+};
+
+static int __init vdpasim_blk_init(void)
+{
+       int ret;
+
+       ret = device_register(&vdpasim_blk_mgmtdev);
+       if (ret)
+	       return ret;
+
+       ret = vdpa_mgmtdev_register(&mgmt_dev);
+       if (ret)
+	       goto parent_err;
+
+       return 0;
+
+parent_err:
+       device_unregister(&vdpasim_blk_mgmtdev);
+       return ret;
+}
+
+static void __exit vdpasim_blk_exit(void)
+{
+       vdpa_mgmtdev_unregister(&mgmt_dev);
+       device_unregister(&vdpasim_blk_mgmtdev);
 }
 
 module_init(vdpasim_blk_init)