linux-kernel - Re: [PATCH V2 05/12] virtio_config: introduce a new ready method

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Date:   Wed, 13 Oct 2021 05:57:25 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, f.hetzelt@...berlin.de,
        david.kaplan@....com, konrad.wilk@...cle.com
Subject: Re: [PATCH V2 05/12] virtio_config: introduce a new ready method

On Tue, Oct 12, 2021 at 02:52:20PM +0800, Jason Wang wrote:
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  include/linux/virtio_config.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> index 8519b3ae5d52..f2891c6221a1 100644
> --- a/include/linux/virtio_config.h
> +++ b/include/linux/virtio_config.h
> @@ -23,6 +23,8 @@ struct virtio_shm_region {
>   *       any of @get/@set, @get_status/@..._status, or @get_features/
>   *       @finalize_features are NOT safe to be called from an atomic
>   *       context.
> + * @ready: make the device ready
> + *      vdev: the virtio_device
>   * @get: read the value of a configuration field
>   *	vdev: the virtio_device
>   *	offset: the offset of the configuration field

I think it's too vague. device_ready makes device ready to receive
kicks. What does this one do? I don't like calling things by where
they are called from, I prefer calling them by what they do.
It actually enables callbacks, right?
So enable_cbs?


> @@ -75,6 +77,7 @@ struct virtio_shm_region {
>   */
>  typedef void vq_callback_t(struct virtqueue *);
>  struct virtio_config_ops {
> +	void (*ready)(struct virtio_device *vdev);
>  	void (*get)(struct virtio_device *vdev, unsigned offset,
>  		    void *buf, unsigned len);
>  	void (*set)(struct virtio_device *vdev, unsigned offset,
> @@ -229,6 +232,9 @@ void virtio_device_ready(struct virtio_device *dev)
>  {
>  	unsigned status = dev->config->get_status(dev);
>  
> +	if (dev->config->ready)
> +                  dev->config->ready(dev);
> +
>  	BUG_ON(status & VIRTIO_CONFIG_S_DRIVER_OK);
>  	dev->config->set_status(dev, status | VIRTIO_CONFIG_S_DRIVER_OK);
>  }
> -- 
> 2.25.1