linux-kernel - Re: [PATCH v2 6/6] firmware: arm_scmi: add SCMIv3.0 Sensor notifications

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Message-ID: <8f8e171e-03eb-f818-48e5-f542d1ab9061@opensynergy.com>
Date:   Tue, 10 Nov 2020 17:01:57 +0100
From:   Peter Hilber <peter.hilber@...nsynergy.com>
To:     Cristian Marussi <cristian.marussi@....com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <mikhail.golubev@...nsynergy.com>, <Igor.Skalkin@...nsynergy.com>,
        <jbhayana@...gle.com>, <sudeep.holla@....com>,
        <peter.hilber@...nsynergy.com>, <james.quinlan@...adcom.com>,
        <Jonathan.Cameron@...wei.com>, <egranata@...gle.com>,
        <lukasz.luba@....com>
Subject: Re: [PATCH v2 6/6] firmware: arm_scmi: add SCMIv3.0 Sensor
 notifications

On 26.10.20 21:10, Cristian Marussi wrote:
> Add support for new SCMIv3.0 SENSOR_UPDATE notification.
> 
> Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> ---
>  drivers/firmware/arm_scmi/sensors.c | 124 ++++++++++++++++++++++++----
>  include/linux/scmi_protocol.h       |   9 ++
>  2 files changed, 116 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
> index 372a3592e99b..51921e279c9f 100644
> --- a/drivers/firmware/arm_scmi/sensors.c
> +++ b/drivers/firmware/arm_scmi/sensors.c
> @@ -24,6 +24,7 @@ enum scmi_sensor_protocol_cmd {
>  	SENSOR_LIST_UPDATE_INTERVALS = 0x8,
>  	SENSOR_CONFIG_GET = 0x9,
>  	SENSOR_CONFIG_SET = 0xA,
> +	SENSOR_CONTINUOUS_UPDATE_NOTIFY = 0xB,
>  };
>  
>  struct scmi_msg_resp_sensor_attributes {
> @@ -133,10 +134,10 @@ struct scmi_msg_resp_sensor_list_update_intervals {
>  	__le32 intervals[];
>  };
>  
> -struct scmi_msg_sensor_trip_point_notify {
> +struct scmi_msg_sensor_request_notify {
>  	__le32 id;
>  	__le32 event_control;
> -#define SENSOR_TP_NOTIFY_ALL	BIT(0)
> +#define SENSOR_NOTIFY_ALL	BIT(0)
>  };
>  
>  struct scmi_msg_set_sensor_trip_point {
> @@ -198,6 +199,17 @@ struct scmi_sensor_trip_notify_payld {
>  	__le32 trip_point_desc;
>  };
>  
> +struct scmi_msg_sensor_continuous_update_notify {
> +	__le32 id;
> +	__le32 event_control;
> +};

This struct appears unused and redundant to struct
scmi_msg_sensor_request_notify.

[...]

> @@ -850,20 +892,58 @@ static void *scmi_sensor_fill_custom_report(const struct scmi_handle *handle,
>  					    const void *payld, size_t payld_sz,
>  					    void *report, u32 *src_id)
>  {
> +	void *rep = NULL;
>  	const struct scmi_sensor_trip_notify_payld *p = payld;
>  	struct scmi_sensor_trip_point_report *r = report;

Above two variables should be moved into the first case block.

Best regards,

Peter

>  
> -	if (evt_id != SCMI_EVENT_SENSOR_TRIP_POINT_EVENT ||
> -	    sizeof(*p) != payld_sz)
> -		return NULL;
> +	switch (evt_id) {
> +	case SCMI_EVENT_SENSOR_TRIP_POINT_EVENT:
> +	{
> +		if (sizeof(*p) != payld_sz)
> +			break;
>  
> -	r->timestamp = timestamp;
> -	r->agent_id = le32_to_cpu(p->agent_id);
> -	r->sensor_id = le32_to_cpu(p->sensor_id);
> -	r->trip_point_desc = le32_to_cpu(p->trip_point_desc);
> -	*src_id = r->sensor_id;
> +		r->timestamp = timestamp;
> +		r->agent_id = le32_to_cpu(p->agent_id);
> +		r->sensor_id = le32_to_cpu(p->sensor_id);
> +		r->trip_point_desc = le32_to_cpu(p->trip_point_desc);
> +		*src_id = r->sensor_id;
> +		rep = r;
> +		break;
> +	}
> +	case SCMI_EVENT_SENSOR_UPDATE:
> +	{
> +		int i;
> +		struct scmi_sensor_info *s;
> +		const struct scmi_sensor_update_notify_payld *p = payld;
> +		struct scmi_sensor_update_report *r = report;
> +		struct sensors_info *sinfo = handle->sensor_priv;
> +
> +		/* payld_sz is variable for this event */
> +		r->sensor_id = le32_to_cpu(p->sensor_id);
> +		if (r->sensor_id >= sinfo->num_sensors)
> +			break;
> +		r->timestamp = timestamp;
> +		r->agent_id = le32_to_cpu(p->agent_id);
> +		s = &sinfo->sensors[r->sensor_id];
> +		/*
> +		 * The generated report r (@struct scmi_sensor_update_report)
> +		 * was pre-allocated to contain up to SCMI_MAX_NUM_SENSOR_AXIS
> +		 * readings: here it is filled with the effective @num_axis
> +		 * readings defined for this sensor or 1 for scalar sensors.
> +		 */
> +		r->readings_count = s->num_axis ?: 1;
> +		for (i = 0; i < r->readings_count; i++)
> +			scmi_parse_sensor_readings(&r->readings[i],
> +						   &p->readings[i]);
> +		*src_id = r->sensor_id;
> +		rep = r;
> +		break;
> +	}
> +	default:
> +		break;
> +	}
>  
> -	return r;
> +	return rep;
>  }