Subject: Re: [PATCH v2 3/6] remoteproc: sysmon: Inform current rproc about all active rprocs

From: Bjorn Andersson <[email-masked]>
Date: Mon, 20 Apr 2020 00:09:00 -0700

On Wed 08 Apr 16:36 PDT 2020, Siddharth Gupta wrote:

> Clients/services running on a remoteproc that booted up might need to be
> aware of the state of already running remoteprocs. When a remoteproc boots
> up (fresh or after recovery) it is not aware of the remoteprocs that booted
> before it, i.e., the system state is incomplete. So to keep track of it we
> send sysmon on behalf of all 'ONLINE' remoteprocs.
> 
> Signed-off-by: Siddharth Gupta <[email-masked]>

Reviewed-by: Bjorn Andersson <[email-masked]>

Regards,
Bjorn

> ---
>  drivers/remoteproc/qcom_sysmon.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/remoteproc/qcom_sysmon.c b/drivers/remoteproc/qcom_sysmon.c
> index 851664e..8d8996d 100644
> --- a/drivers/remoteproc/qcom_sysmon.c
> +++ b/drivers/remoteproc/qcom_sysmon.c
> @@ -453,10 +453,20 @@ static int sysmon_prepare(struct rproc_subdev *subdev)
>  	return 0;
>  }
>  
> +/**
> + * sysmon_start() - start callback for the sysmon remoteproc subdevice
> + * @subdev:	instance of the sysmon subdevice
> + *
> + * Inform all the listners of sysmon notifications that the rproc associated
> + * to @subdev has booted up. The rproc that booted up also needs to know
> + * which rprocs are already up and running, so send start notifications
> + * on behalf of all the online rprocs.
> + */
>  static int sysmon_start(struct rproc_subdev *subdev)
>  {
>  	struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon,
>  						  subdev);
> +	struct qcom_sysmon *target;
>  	struct sysmon_event event = {
>  		.subsys_name = sysmon->name,
>  		.ssr_event = SSCTL_SSR_EVENT_AFTER_POWERUP
> @@ -464,6 +474,21 @@ static int sysmon_start(struct rproc_subdev *subdev)
>  
>  	blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)&event);
>  
> +	mutex_lock(&sysmon_lock);
> +	list_for_each_entry(target, &sysmon_list, node) {
> +		if (target == sysmon ||
> +		    target->rproc->state != RPROC_RUNNING)
> +			continue;
> +
> +		event.subsys_name = target->name;
> +
> +		if (sysmon->ssctl_version == 2)
> +			ssctl_send_event(sysmon, &event);
> +		else if (sysmon->ept)
> +			sysmon_send_event(sysmon, &event);
> +	}
> +	mutex_unlock(&sysmon_lock);
> +
>  	return 0;
>  }
>  
> -- 
> Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project

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