linux-kernel - RE: [PATCH 11/13] remoteproc: Properly deal with detach request

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Message-ID: <DB6PR0402MB27608C80AA68CFB8DAB3C6F088020@DB6PR0402MB2760.eurprd04.prod.outlook.com>
Date:   Thu, 15 Oct 2020 02:30:11 +0000
From:   Peng Fan <peng.fan@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "ohad@...ery.com" <ohad@...ery.com>
CC:     "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 11/13] remoteproc: Properly deal with detach request

> Subject: [PATCH 11/13] remoteproc: Properly deal with detach request
> 
> This patch introduces the capability to detach a remote processor that has
> been attached to or booted by the remoteproc core.  For that to happen a
> rproc::ops::detach() operation need to be available.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  drivers/remoteproc/remoteproc_cdev.c  | 6 ++++++
> drivers/remoteproc/remoteproc_sysfs.c | 6 ++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_cdev.c
> b/drivers/remoteproc/remoteproc_cdev.c
> index d06f8d4919c7..3a3830e27050 100644
> --- a/drivers/remoteproc/remoteproc_cdev.c
> +++ b/drivers/remoteproc/remoteproc_cdev.c
> @@ -42,6 +42,12 @@ static ssize_t rproc_cdev_write(struct file *filp, const
> char __user *buf, size_
>  			return -EINVAL;
> 
>  		ret = rproc_shutdown(rproc);
> +	} else if (!strncmp(cmd, "detach", len)) {
> +		if (rproc->state != RPROC_RUNNING &&
> +		    rproc->state != RPROC_ATTACHED)
> +			return -EINVAL;
> +
> +		ret = rproc_detach(rproc);
>  	} else {
>  		dev_err(&rproc->dev, "Unrecognized option\n");
>  		ret = -EINVAL;
> diff --git a/drivers/remoteproc/remoteproc_sysfs.c
> b/drivers/remoteproc/remoteproc_sysfs.c
> index 6134d2f083ce..013231f69837 100644
> --- a/drivers/remoteproc/remoteproc_sysfs.c
> +++ b/drivers/remoteproc/remoteproc_sysfs.c
> @@ -118,6 +118,12 @@ static ssize_t state_store(struct device *dev,
>  			return -EINVAL;
> 
>  		ret = rproc_shutdown(rproc);
> +	} else if (sysfs_streq(buf, "detach")) {
> +		if (rproc->state != RPROC_RUNNING &&
> +		    rproc->state != RPROC_ATTACHED)
> +			return -EINVAL;
> +
> +		ret = rproc_detach(rproc);
>  	} else {
>  		dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
>  		ret = -EINVAL;
> --

Reviewed-by: Peng Fan <peng.fan@....com>