linux-kernel - Re: [PATCH v5 11/16] rpmsg: virtio: register the rpmsg

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Date:   Wed, 3 Mar 2021 11:43:45 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Andy Gross <agross@...nel.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v5 11/16] rpmsg: virtio: register the rpmsg_ctrl device

On Fri, Feb 19, 2021 at 12:14:56PM +0100, Arnaud Pouliquen wrote:
> Instantiate the rpmsg_ioctl device on virtio RPMsg bus creation.

s/rpmsg_ioctl/rpmsg_ctrl

Now I understand what you meant in patch 05.

> This provides the possibility to expose the RPMSG_CREATE_EPT_IOCTL
> to create RPMsg chdev endpoints.

You mean RPMSG device endpoints, i.e rpmsg_eptdev?  If so I think it should be
added to the changelog.  Otherwiser someone could be tempted to look for "chdev"
and find anything but a rpmsg_eptdev.

> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> 
> ---
> V5:
> Fix compilation issue
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
>  drivers/rpmsg/virtio_rpmsg_bus.c | 57 +++++++++++++++++++++++++++++---
>  1 file changed, 52 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
> index e87d4cf926eb..2e6b34084012 100644
> --- a/drivers/rpmsg/virtio_rpmsg_bus.c
> +++ b/drivers/rpmsg/virtio_rpmsg_bus.c
> @@ -813,14 +813,52 @@ static void rpmsg_xmit_done(struct virtqueue *svq)
>  	wake_up_interruptible(&vrp->sendq);
>  }
>  
> +static struct rpmsg_device *rpmsg_virtio_add_ctrl_dev(struct virtio_device *vdev)
> +{
> +	struct virtproc_info *vrp = vdev->priv;
> +	struct virtio_rpmsg_channel *vch;
> +	struct rpmsg_device *rpdev_ctrl;
> +	int err = 0;
> +
> +	vch = kzalloc(sizeof(*vch), GFP_KERNEL);
> +	if (!vch)
> +		return ERR_PTR(-ENOMEM);
> +
> +	/* Link the channel to the vrp */
> +	vch->vrp = vrp;
> +
> +	/* Assign public information to the rpmsg_device */
> +	rpdev_ctrl = &vch->rpdev;
> +	rpdev_ctrl->ops = &virtio_rpmsg_ops;
> +
> +	rpdev_ctrl->dev.parent = &vrp->vdev->dev;
> +	rpdev_ctrl->dev.release = virtio_rpmsg_release_device;
> +	rpdev_ctrl->little_endian = virtio_is_little_endian(vrp->vdev);
> +
> +	err = rpmsg_ctrl_register_device(rpdev_ctrl);
> +	if (err) {
> +		kfree(vch);
> +		return ERR_PTR(err);
> +	}
> +
> +	return rpdev_ctrl;
> +}
> +
> +static void rpmsg_virtio_del_ctrl_dev(struct rpmsg_device *rpdev_ctrl)
> +{
> +	if (!rpdev_ctrl)
> +		return;
> +	kfree(to_virtio_rpmsg_channel(rpdev_ctrl));
> +}
> +
>  static int rpmsg_probe(struct virtio_device *vdev)
>  {
>  	vq_callback_t *vq_cbs[] = { rpmsg_recv_done, rpmsg_xmit_done };
>  	static const char * const names[] = { "input", "output" };
>  	struct virtqueue *vqs[2];
>  	struct virtproc_info *vrp;
> -	struct virtio_rpmsg_channel *vch;
> -	struct rpmsg_device *rpdev_ns;
> +	struct virtio_rpmsg_channel *vch = NULL;
> +	struct rpmsg_device *rpdev_ns = NULL, *rpdev_ctrl;

As far as I can tell @rpdev_ns doesn't have to be initialized.

>  	void *bufs_va;
>  	int err = 0, i;
>  	size_t total_buf_space;
> @@ -894,12 +932,18 @@ static int rpmsg_probe(struct virtio_device *vdev)
>  
>  	vdev->priv = vrp;
>  
> +	rpdev_ctrl = rpmsg_virtio_add_ctrl_dev(vdev);
> +	if (IS_ERR(rpdev_ctrl)) {
> +		err = PTR_ERR(rpdev_ctrl);
> +		goto free_coherent;
> +	}
> +
>  	/* if supported by the remote processor, enable the name service */
>  	if (virtio_has_feature(vdev, VIRTIO_RPMSG_F_NS)) {
>  		vch = kzalloc(sizeof(*vch), GFP_KERNEL);
>  		if (!vch) {
>  			err = -ENOMEM;
> -			goto free_coherent;
> +			goto free_ctrldev;
>  		}
>  
>  		/* Link the channel to our vrp */
> @@ -915,7 +959,7 @@ static int rpmsg_probe(struct virtio_device *vdev)
>  
>  		err = rpmsg_ns_register_device(rpdev_ns);
>  		if (err)
> -			goto free_coherent;
> +			goto free_vch;
>  	}
>  
>  	/*
> @@ -939,8 +983,11 @@ static int rpmsg_probe(struct virtio_device *vdev)
>  
>  	return 0;
>  
> -free_coherent:
> +free_vch:
>  	kfree(vch);
> +free_ctrldev:
> +	rpmsg_virtio_del_ctrl_dev(rpdev_ctrl);
> +free_coherent:
>  	dma_free_coherent(vdev->dev.parent, total_buf_space,
>  			  bufs_va, vrp->bufs_dma);
>  vqs_del:
> -- 
> 2.17.1
>