| Message ID | 20211224070404.54840-1-wang.yi59@zte.com.cn (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] vdpa: regist vhost-vdpa dev class | expand |
On Fri, Dec 24, 2021 at 3:13 PM Yi Wang <wang.yi59@zte.com.cn> wrote: > > From: Zhang Min <zhang.min9@zte.com.cn> > > Some applications like kata-containers need to acquire MAJOR/MINOR/DEVNAME > for devInfo [1], so regist vhost-vdpa dev class to expose uevent. Hi: I think we need to be more verbose here e.g: 1) why can't we get major/minor with the current interface 2) what kind of the uevent is required and not supported currently Thanks > > 1. https://github.com/kata-containers/kata-containers/blob/main/src/runtime/virtcontainers/device/config/config.go > > Signed-off-by: Zhang Min <zhang.min9@zte.com.cn> > Signed-off-by: Yi Wang <wang.yi59@zte.com.cn> > --- > 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 >
Hi Jason, > On Fri, Dec 24, 2021 at 3:13 PM Yi Wangwrote: > > > > From: Zhang Min > > > > Some applications like kata-containers need to acquire MAJOR/MINOR/DEVNAME > > for devInfo [1], so regist vhost-vdpa dev class to expose uevent. > > Hi: > > I think we need to be more verbose here e.g: > > 1) why can't we get major/minor with the current interface Although major/minor can be acquired in /sys/bus/vdpa/devices/vdpa0/vhost-vdpa/vhost-vdpa-0/dev, applications like kata-containers prefer and actually have tried to obtain them in /sys/class/vhost-vdpa/vhost-vdpa-0/uevent, such like [1]. > 2) what kind of the uevent is required and not supported currently The items needed show in uevent are MAJOR MINOR DEVNAME that vhost_vdpa_probe currently has registed, but dev_uevent_filter failed to pass and uevent show is empty now, so we regist dev class to let dev_uevent_filter pass and show them. 1. https://github.com/kata-containers/kata-containers/blob/main/src/runtime/virtcontainers/device/config/config.go > > Thanks > > > > > 1. https://github.com/kata-containers/kata-containers/blob/main/src/runtime/virtcontainers/device/config/config.go > > > > Signed-off-by: Zhang Min
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);