linux-kernel - Re: [PATCH 21/22] firmware: arm_scmi: Add SCMI v3.1 Perf power-cost in microwatts

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Date:   Wed, 30 Mar 2022 17:46:19 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     Cristian Marussi <cristian.marussi@....com>
Cc:     sudeep.holla@....com, james.quinlan@...adcom.com,
        Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
        etienne.carriere@...aro.org, vincent.guittot@...aro.org,
        souvik.chakravarty@....com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 21/22] firmware: arm_scmi: Add SCMI v3.1 Perf power-cost
 in microwatts



On 3/30/22 16:05, Cristian Marussi wrote:
> Add SCMIv3.1 internal support for parsing message attributes reporting
> the capability of a performance domain to report power-cost in microwatts.
> 
> Cc: Lukasz Luba <lukasz.luba@....com>
> Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> ---
>   drivers/firmware/arm_scmi/perf.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
> index e1aa0ed67971..65ffda5495d6 100644
> --- a/drivers/firmware/arm_scmi/perf.c
> +++ b/drivers/firmware/arm_scmi/perf.c
> @@ -45,6 +45,7 @@ struct scmi_msg_resp_perf_attributes {
>   	__le16 num_domains;
>   	__le16 flags;
>   #define POWER_SCALE_IN_MILLIWATT(x)	((x) & BIT(0))
> +#define POWER_SCALE_IN_MICROWATT(x)	((x) & BIT(1))
>   	__le32 stats_addr_low;
>   	__le32 stats_addr_high;
>   	__le32 stats_size;
> @@ -170,6 +171,7 @@ struct scmi_perf_info {
>   	u32 version;
>   	int num_domains;
>   	bool power_scale_mw;
> +	bool power_scale_uw;
>   	u64 stats_addr;
>   	u32 stats_size;
>   	struct perf_dom_info *dom_info;
> @@ -200,6 +202,8 @@ static int scmi_perf_attributes_get(const struct scmi_protocol_handle *ph,
>   
>   		pi->num_domains = le16_to_cpu(attr->num_domains);
>   		pi->power_scale_mw = POWER_SCALE_IN_MILLIWATT(flags);
> +		if (PROTOCOL_REV_MAJOR(pi->version) >= 0x3)
> +			pi->power_scale_uw = POWER_SCALE_IN_MICROWATT(flags);
>   		pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
>   				(u64)le32_to_cpu(attr->stats_addr_high) << 32;
>   		pi->stats_size = le32_to_cpu(attr->stats_size);

LGTM,

Reviewed-by: Lukasz Luba <lukasz.luba@....com>

I'll send a follow-up patch which is using this information when this
patch gets into linux-next.