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

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Message-Id: <20220330150551.2573938-22-cristian.marussi@arm.com>
Date:   Wed, 30 Mar 2022 16:05:50 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
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, cristian.marussi@....com,
        Lukasz Luba <lukasz.luba@....com>
Subject: [PATCH 21/22] firmware: arm_scmi: Add SCMI v3.1 Perf power-cost in microwatts

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);
-- 
2.32.0