linux-kernel - Re: [PATCH] mdev: Send uevents around parent device registration

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Date:   Wed, 26 Jun 2019 12:05:51 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Kirti Wankhede <kwankhede@...dia.com>
Cc:     <cohuck@...hat.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mdev: Send uevents around parent device registration

On Wed, 26 Jun 2019 23:23:00 +0530
Kirti Wankhede <kwankhede@...dia.com> wrote:

> On 6/26/2019 7:57 PM, Alex Williamson wrote:
> > This allows udev to trigger rules when a parent device is registered
> > or unregistered from mdev.
> > 
> > Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> > ---
> >  drivers/vfio/mdev/mdev_core.c |   10 ++++++++--
> >  1 file changed, 8 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
> > index ae23151442cb..ecec2a3b13cb 100644
> > --- a/drivers/vfio/mdev/mdev_core.c
> > +++ b/drivers/vfio/mdev/mdev_core.c
> > @@ -146,6 +146,8 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
> >  {
> >  	int ret;
> >  	struct mdev_parent *parent;
> > +	char *env_string = "MDEV_STATE=registered";
> > +	char *envp[] = { env_string, NULL };
> >  
> >  	/* check for mandatory ops */
> >  	if (!ops || !ops->create || !ops->remove || !ops->supported_type_groups)
> > @@ -196,7 +198,8 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
> >  	list_add(&parent->next, &parent_list);
> >  	mutex_unlock(&parent_list_lock);
> >  
> > -	dev_info(dev, "MDEV: Registered\n");
> > +	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
> > +  
> 
> Its good to have udev event, but don't remove debug print from dmesg.
> Same for unregister.

Who consumes these?  They seem noisy.  Thanks,

Alex

> >  	return 0;
> >  
> >  add_dev_err:
> > @@ -220,6 +223,8 @@ EXPORT_SYMBOL(mdev_register_device);
> >  void mdev_unregister_device(struct device *dev)
> >  {
> >  	struct mdev_parent *parent;
> > +	char *env_string = "MDEV_STATE=unregistered";
> > +	char *envp[] = { env_string, NULL };
> >  
> >  	mutex_lock(&parent_list_lock);
> >  	parent = __find_parent_device(dev);
> > @@ -228,7 +233,6 @@ void mdev_unregister_device(struct device *dev)
> >  		mutex_unlock(&parent_list_lock);
> >  		return;
> >  	}
> > -	dev_info(dev, "MDEV: Unregistering\n");
> >  
> >  	list_del(&parent->next);
> >  	mutex_unlock(&parent_list_lock);
> > @@ -243,6 +247,8 @@ void mdev_unregister_device(struct device *dev)
> >  	up_write(&parent->unreg_sem);
> >  
> >  	mdev_put_parent(parent);
> > +
> > +	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
> >  }
> >  EXPORT_SYMBOL(mdev_unregister_device);
> >  
> >