linux-kernel - RE: [PATCH 05/13] remoteproc: Add new detach() remoteproc operation

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Message-ID: <DB6PR0402MB2760E8ECEBDBFF9E02FA74D888020@DB6PR0402MB2760.eurprd04.prod.outlook.com>
Date:   Thu, 15 Oct 2020 01:37:42 +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 05/13] remoteproc: Add new detach() remoteproc operation

> Subject: [PATCH 05/13] remoteproc: Add new detach() remoteproc operation
> 
> Add an new detach() operation in order to support scenarios where the
> remoteproc core is going away but the remote processor is kept operating.
> This could be the case when the system is rebooted or when the platform
> driver is removed.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  include/linux/remoteproc.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index
> fe383392a821..1a57e165da2c 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -361,6 +361,7 @@ enum rsc_handling_status {
>   * @start:	power on the device and boot it
>   * @stop:	power off the device
>   * @attach:	attach to a device that his already powered up
> + * @detach:	tell the remote processor that the core is going away
>   * @kick:	kick a virtqueue (virtqueue id given as a parameter)
>   * @da_to_va:	optional platform hook to perform address translations
>   * @parse_fw:	parse firmware to extract information (e.g. resource table)
> @@ -382,6 +383,7 @@ struct rproc_ops {
>  	int (*start)(struct rproc *rproc);
>  	int (*stop)(struct rproc *rproc);
>  	int (*attach)(struct rproc *rproc);
> +	int (*detach)(struct rproc *rproc);
>  	void (*kick)(struct rproc *rproc, int vqid);
>  	void * (*da_to_va)(struct rproc *rproc, u64 da, size_t len);
>  	int (*parse_fw)(struct rproc *rproc, const struct firmware *fw);
> --

This look useful for i.MX8 partitioned case, M4 and A53 could reboot without
impacting the other. When A53 reboot, detach is invoked if I understand correct.

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