linux-kernel - Re: [PATCH v6 09/16] remoteproc: Introduce function __rproc

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Date:   Fri, 26 Feb 2021 17:15:13 +0100
From:   Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>, <ohad@...ery.com>,
        <bjorn.andersson@...aro.org>, <arnaud.pouliquen@...com>
CC:     <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 09/16] remoteproc: Introduce function __rproc_detach()



On 2/24/21 12:35 AM, Mathieu Poirier wrote:
> Introduce function __rproc_detach() to perform the same kind of
> operation as rproc_stop(), but instead of switching off the
> remote processor using rproc->ops->stop(), it uses
> rproc->ops->detach().  That way it is possible for the core
> to release the resources associated with a remote processor while
> the latter is kept operating.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Reviewed-by: Peng Fan <peng.fan@....com>

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

Thanks,
Arnaud
> ---
>  drivers/remoteproc/remoteproc_core.c | 30 ++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 86572880c726..0f680b7ff8f1 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1706,6 +1706,36 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
>  	return 0;
>  }
>  
> +/*
> + * __rproc_detach(): Does the opposite of __rproc_attach()
> + */
> +static int __maybe_unused __rproc_detach(struct rproc *rproc)
> +{
> +	struct device *dev = &rproc->dev;
> +	int ret;
> +
> +	/* No need to continue if a detach() operation has not been provided */
> +	if (!rproc->ops->detach)
> +		return -EINVAL;
> +
> +	/* Stop any subdevices for the remote processor */
> +	rproc_stop_subdevices(rproc, false);
> +
> +	/* Tell the remote processor the core isn't available anymore */
> +	ret = rproc->ops->detach(rproc);
> +	if (ret) {
> +		dev_err(dev, "can't detach from rproc: %d\n", ret);
> +		return ret;
> +	}
> +
> +	rproc_unprepare_subdevices(rproc);
> +
> +	rproc->state = RPROC_DETACHED;
> +
> +	dev_info(dev, "detached remote processor %s\n", rproc->name);
> +
> +	return 0;
> +}
>  
>  /**
>   * rproc_trigger_recovery() - recover a remoteproc
>