linux-kernel - Re: [PATCH v6 2/2] remoteproc: qcom: Add notification types to SSR

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Date:   Wed, 8 Jul 2020 18:56:54 -0500
From:   Alex Elder <elder@...e.org>
To:     Rishabh Bhatnagar <rishabhb@...eaurora.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     bjorn.andersson@...aro.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, sidgup@...eaurora.org
Subject: Re: [PATCH v6 2/2] remoteproc: qcom: Add notification types to SSR

On 6/23/20 9:23 PM, Rishabh Bhatnagar wrote:
> The SSR subdevice only adds callback for the unprepare event. Add callbacks
> for prepare, start and prepare events. The client driver for a particular
> remoteproc might be interested in knowing the status of the remoteproc
> while undergoing SSR, not just when the remoteproc has finished shutting
> down.

Looks good.

Reviewed-by: Alex Elder <elder@...aro.org>

> Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>
> Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
> ---
>  drivers/remoteproc/qcom_common.c      | 44 ++++++++++++++++++++++++++++++++++-
>  include/linux/remoteproc/qcom_rproc.h | 16 +++++++++++++
>  2 files changed, 59 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
> index 7a7384c..7ec4597 100644
> --- a/drivers/remoteproc/qcom_common.c
> +++ b/drivers/remoteproc/qcom_common.c
> @@ -265,6 +265,44 @@ int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb)
>  }
>  EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
>  
> +static int ssr_notify_prepare(struct rproc_subdev *subdev)
> +{
> +	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
> +	struct qcom_ssr_notify_data data = {
> +		.name = ssr->info->name,
> +		.crashed = false,
> +	};
> +
> +	srcu_notifier_call_chain(&ssr->info->notifier_list,
> +				 QCOM_SSR_BEFORE_POWERUP, &data);
> +	return 0;
> +}
> +
> +static int ssr_notify_start(struct rproc_subdev *subdev)
> +{
> +	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
> +	struct qcom_ssr_notify_data data = {
> +		.name = ssr->info->name,
> +		.crashed = false,
> +	};
> +
> +	srcu_notifier_call_chain(&ssr->info->notifier_list,
> +				 QCOM_SSR_AFTER_POWERUP, &data);
> +	return 0;
> +}
> +
> +static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
> +{
> +	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
> +	struct qcom_ssr_notify_data data = {
> +		.name = ssr->info->name,
> +		.crashed = crashed,
> +	};
> +
> +	srcu_notifier_call_chain(&ssr->info->notifier_list,
> +				 QCOM_SSR_BEFORE_SHUTDOWN, &data);
> +}
> +
>  static void ssr_notify_unprepare(struct rproc_subdev *subdev)
>  {
>  	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
> @@ -273,7 +311,8 @@ static void ssr_notify_unprepare(struct rproc_subdev *subdev)
>  		.crashed = false,
>  	};
>  
> -	srcu_notifier_call_chain(&ssr->info->notifier_list, 0, &data);
> +	srcu_notifier_call_chain(&ssr->info->notifier_list,
> +				 QCOM_SSR_AFTER_SHUTDOWN, &data);
>  }
>  
>  /**
> @@ -298,6 +337,9 @@ void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
>  	}
>  
>  	ssr->info = info;
> +	ssr->subdev.prepare = ssr_notify_prepare;
> +	ssr->subdev.start = ssr_notify_start;
> +	ssr->subdev.stop = ssr_notify_stop;
>  	ssr->subdev.unprepare = ssr_notify_unprepare;
>  
>  	rproc_add_subdev(rproc, &ssr->subdev);
> diff --git a/include/linux/remoteproc/qcom_rproc.h b/include/linux/remoteproc/qcom_rproc.h
> index 2a1d6d0..6470516 100644
> --- a/include/linux/remoteproc/qcom_rproc.h
> +++ b/include/linux/remoteproc/qcom_rproc.h
> @@ -5,6 +5,22 @@ struct notifier_block;
>  
>  #if IS_ENABLED(CONFIG_QCOM_RPROC_COMMON)
>  
> +/**
> + * enum qcom_ssr_notify_type - Startup/Shutdown events related to a remoteproc
> + * processor.
> + *
> + * @QCOM_SSR_BEFORE_POWERUP:	Remoteproc about to start (prepare stage)
> + * @QCOM_SSR_AFTER_POWERUP:	Remoteproc is running (start stage)
> + * @QCOM_SSR_BEFORE_SHUTDOWN:	Remoteproc crashed or shutting down (stop stage)
> + * @QCOM_SSR_AFTER_SHUTDOWN:	Remoteproc is down (unprepare stage)
> + */
> +enum qcom_ssr_notify_type {
> +	QCOM_SSR_BEFORE_POWERUP,
> +	QCOM_SSR_AFTER_POWERUP,
> +	QCOM_SSR_BEFORE_SHUTDOWN,
> +	QCOM_SSR_AFTER_SHUTDOWN,
> +};
> +
>  struct qcom_ssr_notify_data {
>  	const char *name;
>  	bool crashed;
>