Re: [PATCH v5 5/9] remoteproc: Introducing function rproc_validate()

[Arnaud POULIQUEN <arnaud.pouliquen@st.com>]

On 7/7/20 11:00 PM, Mathieu Poirier wrote:
> Add a new function to assert the general health of the remote
> processor before handing it to the remoteproc core.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>

Thanks,
Arnaud

> ---
>  drivers/remoteproc/remoteproc_core.c | 41 ++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index fd424662801f..ad500c291d5f 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -2040,6 +2040,43 @@ struct rproc *rproc_get_by_phandle(phandle phandle)
>  #endif
>  EXPORT_SYMBOL(rproc_get_by_phandle);
>  
> +static int rproc_validate(struct rproc *rproc)
> +{
> +	switch (rproc->state) {
> +	case RPROC_OFFLINE:
> +		/*
> +		 * An offline processor without a start()
> +		 * function makes no sense.
> +		 */
> +		if (!rproc->ops->start)
> +			return -EINVAL;
> +		break;
> +	case RPROC_DETACHED:
> +		/*
> +		 * A remote processor in a detached state without an
> +		 * attach() function makes not sense.
> +		 */
> +		if (!rproc->ops->attach)
> +			return -EINVAL;
> +		/*
> +		 * When attaching to a remote processor the device memory
> +		 * is already available and as such there is no need to have a
> +		 * cached table.
> +		 */
> +		if (rproc->cached_table)
> +			return -EINVAL;
> +		break;
> +	default:
> +		/*
> +		 * When adding a remote processor, the state of the device
> +		 * can be offline or detached, nothing else.
> +		 */
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  /**
>   * rproc_add() - register a remote processor
>   * @rproc: the remote processor handle to register
> @@ -2069,6 +2106,10 @@ int rproc_add(struct rproc *rproc)
>  	if (ret < 0)
>  		return ret;
>  
> +	ret = rproc_validate(rproc);
> +	if (ret < 0)
> +		return ret;
> +
>  	dev_info(dev, "%s is available\n", rproc->name);
>  
>  	/* create debugfs entries */
>