linux-kernel - Re: [PATCH 6/9] remoteproc: Support virtio config space.

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Date:	Wed, 20 Feb 2013 12:45:10 +0200
From:	Ido Yariv <ido@...ery.com>
To:	sjur.brandeland@...ricsson.com
Cc:	Ohad Ben-Cohen <ohad@...ery.com>, linux-kernel@...r.kernel.org,
	Dmitry Tarnyagin <dmitry.tarnyagin@...ricsson.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Erwan Yvin <erwan.yvin@...ricsson.com>, sjur@...ndeland.net
Subject: Re: [PATCH 6/9] remoteproc: Support virtio config space.

Hi Sjur,

On Sun, Feb 10, 2013 at 12:39:09PM +0100, sjur.brandeland@...ricsson.com wrote:
> From: Sjur Brændeland <sjur.brandeland@...ricsson.com>
> 
> Support virtio configuration space and device status and
> feature negotiation with remote device. This virtio device
> can now access the resource table in shared memory.
> 
> Signed-off-by: Sjur Brændeland <sjur.brandeland@...ricsson.com>
> ---
>  drivers/remoteproc/remoteproc_core.c   |    3 --
>  drivers/remoteproc/remoteproc_virtio.c |   38 +++++++++++++++++++++++++++++--
>  include/linux/remoteproc.h             |    2 -
>  3 files changed, 35 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index c12a385..1bf410d 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -368,9 +368,6 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
>  			goto free_rvdev;
>  	}
>  
> -	/* remember the device features */
> -	rvdev->dfeatures = rsc->dfeatures;
> -
>  	/* remember the resource entry */
>  	rvdev->rsc = rsc;
>  
> diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> index 9e198e5..d98cdd8 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -182,16 +182,21 @@ error:
>   */
>  static u8 rproc_virtio_get_status(struct virtio_device *vdev)
>  {
> -	return 0;
> +	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
> +	return rvdev->rsc->status;
>  }
>  
>  static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
>  {
> +	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
> +	rvdev->rsc->status = status;
>  	dev_dbg(&vdev->dev, "status: %d\n", status);
>  }
>  
>  static void rproc_virtio_reset(struct virtio_device *vdev)
>  {
> +	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
> +	rvdev->rsc->status = 0;
>  	dev_dbg(&vdev->dev, "reset !\n");
>  }
>  
> @@ -200,7 +205,7 @@ static u32 rproc_virtio_get_features(struct virtio_device *vdev)
>  {
>  	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
>  
> -	return rvdev->dfeatures;
> +	return rvdev->rsc->dfeatures;
>  }
>  
>  static void rproc_virtio_finalize_features(struct virtio_device *vdev)
> @@ -219,7 +224,31 @@ static void rproc_virtio_finalize_features(struct virtio_device *vdev)
>  	 * fixed as part of a small resource table overhaul and then an
>  	 * extension of the virtio resource entries.
>  	 */
> -	rvdev->gfeatures = vdev->features[0];
> +	rvdev->rsc->gfeatures = vdev->features[0];
> +}
> +
> +void rproc_virtio_get(struct virtio_device *vdev, unsigned offset,
> +							void *buf, unsigned len)
> +{
> +	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
> +	void *cfg = &rvdev->rsc->vring[rvdev->rsc->num_of_vrings];
> +	if (offset + len > rvdev->rsc->config_len)

Perhaps check for integer overflow here?

> +		dev_err(&vdev->dev,
> +			"rproc_virtio_get: access out of bounds\n");
> +	else
> +		memcpy(buf, cfg + offset, len);
> +}
> +
> +void rproc_virtio_set(struct virtio_device *vdev, unsigned offset,
> +		      const void *buf, unsigned len)
> +{
> +	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
> +	void *cfg = &rvdev->rsc->vring[rvdev->rsc->num_of_vrings];
> +	if (offset + len > rvdev->rsc->config_len)

Here as well.

> +		dev_err(&vdev->dev,
> +			"rproc_virtio_set: access out of bounds\n");
> +	else
> +		memcpy(cfg + offset, buf, len);
>  }
>  
>  static struct virtio_config_ops rproc_virtio_config_ops = {
> @@ -230,6 +259,9 @@ static struct virtio_config_ops rproc_virtio_config_ops = {
>  	.reset		= rproc_virtio_reset,
>  	.set_status	= rproc_virtio_set_status,
>  	.get_status	= rproc_virtio_get_status,
> +	.get		= rproc_virtio_get,
> +	.set		= rproc_virtio_set,
> +
>  };
>  
>  /*
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index cdacd66..c0c363c 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -471,8 +471,6 @@ struct rproc_vdev {
>  	struct rproc *rproc;
>  	struct virtio_device vdev;
>  	struct rproc_vring vring[RVDEV_NUM_VRINGS];
> -	unsigned long dfeatures;
> -	unsigned long gfeatures;
>  	struct fw_rsc_vdev *rsc;
>  };
>  
> -- 
> 1.7.5.4
> 

Thanks,
Ido.
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