[PATCH v2] vdpa: regist vhost-vdpa dev class

From: Yi Wang
Date: Fri Dec 24 2021 - 02:13:11 EST


From: Zhang Min <zhang.min9@xxxxxxxxxx>

Some applications like kata-containers need to acquire MAJOR/MINOR/DEVNAME
for devInfo [1], so regist vhost-vdpa dev class to expose uevent.

1. https://github.com/kata-containers/kata-containers/blob/main/src/runtime/virtcontainers/device/config/config.go

Signed-off-by: Zhang Min <zhang.min9@xxxxxxxxxx>
Signed-off-by: Yi Wang <wang.yi59@xxxxxxxxxx>
---
v2: remove redundant vhost_vdpa_class reset and pr_warn, adjust location
of *vhost_vdpa_class impl and class_destroy.

drivers/vhost/vdpa.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index e3c4f059b21a..55e966c508c8 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -53,6 +53,7 @@ struct vhost_vdpa {
static DEFINE_IDA(vhost_vdpa_ida);

static dev_t vhost_vdpa_major;
+static struct class *vhost_vdpa_class;

static void handle_vq_kick(struct vhost_work *work)
{
@@ -1140,6 +1141,7 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
v->dev.release = vhost_vdpa_release_dev;
v->dev.parent = &vdpa->dev;
v->dev.devt = MKDEV(MAJOR(vhost_vdpa_major), minor);
+ v->dev.class = vhost_vdpa_class;
v->vqs = kmalloc_array(v->nvqs, sizeof(struct vhost_virtqueue),
GFP_KERNEL);
if (!v->vqs) {
@@ -1197,6 +1199,10 @@ static int __init vhost_vdpa_init(void)
{
int r;

+ vhost_vdpa_class = class_create(THIS_MODULE, "vhost-vdpa");
+ if (IS_ERR(vhost_vdpa_class))
+ return PTR_ERR(vhost_vdpa_class);
+
r = alloc_chrdev_region(&vhost_vdpa_major, 0, VHOST_VDPA_DEV_MAX,
"vhost-vdpa");
if (r)
@@ -1211,6 +1217,7 @@ static int __init vhost_vdpa_init(void)
err_vdpa_register_driver:
unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);
err_alloc_chrdev:
+ class_destroy(vhost_vdpa_class);
return r;
}
module_init(vhost_vdpa_init);
@@ -1219,6 +1226,7 @@ static void __exit vhost_vdpa_exit(void)
{
vdpa_unregister_driver(&vhost_vdpa_driver);
unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);
+ class_destroy(vhost_vdpa_class);
}
module_exit(vhost_vdpa_exit);

--
2.27.0