linux-kernel - Re: [PATCH v5 2/2] remoteproc: core: Register the character device interface

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Message-ID: <20200730170723.GB3155400@xps15>
Date:   Thu, 30 Jul 2020 11:07:23 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Siddharth Gupta <sidgup@...eaurora.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, ohad@...ery.com,
        corbet@....net, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, rishabhb@...eaurora.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v5 2/2] remoteproc: core: Register the character device
 interface

On Wed, Jul 29, 2020 at 10:40:01AM -0700, Siddharth Gupta wrote:
> Add the character device during rproc_add. This would create
> a character device node at /dev/remoteproc<index>. Userspace
> applications can interact with the remote processor using this
> interface.
> 
> Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
> Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>

Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>

> ---
>  drivers/remoteproc/remoteproc_core.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 277d3bf..7f90eee 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1986,6 +1986,11 @@ int rproc_add(struct rproc *rproc)
>  	/* create debugfs entries */
>  	rproc_create_debug_dir(rproc);
>  
> +	/* add char device for this remoteproc */
> +	ret = rproc_char_device_add(rproc);
> +	if (ret < 0)
> +		return ret;
> +
>  	/*
>  	 * Remind ourselves the remote processor has been attached to rather
>  	 * than booted by the remoteproc core.  This is important because the
> @@ -2262,6 +2267,7 @@ int rproc_del(struct rproc *rproc)
>  	mutex_unlock(&rproc->lock);
>  
>  	rproc_delete_debug_dir(rproc);
> +	rproc_char_device_remove(rproc);
>  
>  	/* the rproc is downref'ed as soon as it's removed from the klist */
>  	mutex_lock(&rproc_list_mutex);
> @@ -2430,6 +2436,7 @@ static int __init remoteproc_init(void)
>  {
>  	rproc_init_sysfs();
>  	rproc_init_debugfs();
> +	rproc_init_cdev();
>  	rproc_init_panic();
>  
>  	return 0;
> -- 
> Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>