firmware: arm_scmi: Add SCMI v3.1 protocol extended names support

Using the common protocol helper implementation add support for all new
SCMIv3.1 extended names commands related to all protocols with the
exception of SENSOR_AXIS_GET_NAME.

Link: https://lore.kernel.org/r/20220330150551.2573938-12-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

8 files changed, 104 insertions, 19 deletions

diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c
index 40a6364e5578..7a031afff389 100644
--- a/drivers/firmware/arm_scmi/clock.c
+++ b/drivers/firmware/arm_scmi/clock.c
@@ -16,6 +16,7 @@ enum scmi_clock_protocol_cmd {
 	CLOCK_RATE_SET = 0x5,
 	CLOCK_RATE_GET = 0x6,
 	CLOCK_CONFIG_SET = 0x7,
+	CLOCK_NAME_GET = 0x8,
 };
 
 struct scmi_msg_resp_clock_protocol_attributes {
@@ -27,7 +28,8 @@ struct scmi_msg_resp_clock_protocol_attributes {
 struct scmi_msg_resp_clock_attributes {
 	__le32 attributes;
 #define	CLOCK_ENABLE	BIT(0)
-	u8 name[SCMI_MAX_STR_SIZE];
+#define SUPPORTS_EXTENDED_NAMES(x)	((x) & BIT(29))
+	u8 name[SCMI_SHORT_NAME_MAX_SIZE];
 	__le32 clock_enable_latency;
 };
 
@@ -108,9 +110,11 @@ scmi_clock_protocol_attributes_get(const struct scmi_protocol_handle *ph,
 }
 
 static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
-				     u32 clk_id, struct scmi_clock_info *clk)
+				     u32 clk_id, struct scmi_clock_info *clk,
+				     u32 version)
 {
 	int ret;
+	u32 attributes;
 	struct scmi_xfer *t;
 	struct scmi_msg_resp_clock_attributes *attr;
 
@@ -124,6 +128,7 @@ static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
 
 	ret = ph->xops->do_xfer(ph, t);
 	if (!ret) {
+		attributes = le32_to_cpu(attr->attributes);
 		strlcpy(clk->name, attr->name, SCMI_MAX_STR_SIZE);
 		/* Is optional field clock_enable_latency provided ? */
 		if (t->rx.len == sizeof(*attr))
@@ -132,6 +137,16 @@ static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
 	}
 
 	ph->xops->xfer_put(ph, t);
+
+	/*
+	 * If supported overwrite short name with the extended one;
+	 * on error just carry on and use already provided short name.
+	 */
+	if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x2 &&
+	    SUPPORTS_EXTENDED_NAMES(attributes))
+		ph->hops->extended_name_get(ph, CLOCK_NAME_GET, clk_id,
+					    clk->name, SCMI_MAX_STR_SIZE);
+
 	return ret;
 }
 
@@ -400,7 +415,7 @@ static int scmi_clock_protocol_init(const struct scmi_protocol_handle *ph)
 	for (clkid = 0; clkid < cinfo->num_clocks; clkid++) {
 		struct scmi_clock_info *clk = cinfo->clk + clkid;
 
-		ret = scmi_clock_attributes_get(ph, clkid, clk);
+		ret = scmi_clock_attributes_get(ph, clkid, clk, version);
 		if (!ret)
 			scmi_clock_describe_rates_get(ph, clkid, clk);
 	}
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 0e9703310758..9e046fd121b9 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -32,6 +32,7 @@ enum scmi_performance_protocol_cmd {
 	PERF_NOTIFY_LIMITS = 0x9,
 	PERF_NOTIFY_LEVEL = 0xa,
 	PERF_DESCRIBE_FASTCHANNEL = 0xb,
+	PERF_DOMAIN_NAME_GET = 0xc,
 };
 
 struct scmi_opp {
@@ -56,10 +57,11 @@ struct scmi_msg_resp_perf_domain_attributes {
 #define SUPPORTS_PERF_LIMIT_NOTIFY(x)	((x) & BIT(29))
 #define SUPPORTS_PERF_LEVEL_NOTIFY(x)	((x) & BIT(28))
 #define SUPPORTS_PERF_FASTCHANNELS(x)	((x) & BIT(27))
+#define SUPPORTS_EXTENDED_NAMES(x)	((x) & BIT(26))
 	__le32 rate_limit_us;
 	__le32 sustained_freq_khz;
 	__le32 sustained_perf_level;
-	    u8 name[SCMI_MAX_STR_SIZE];
+	    u8 name[SCMI_SHORT_NAME_MAX_SIZE];
 };
 
 struct scmi_msg_perf_describe_levels {
@@ -209,9 +211,11 @@ static int scmi_perf_attributes_get(const struct scmi_protocol_handle *ph,
 
 static int
 scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
-				u32 domain, struct perf_dom_info *dom_info)
+				u32 domain, struct perf_dom_info *dom_info,
+				u32 version)
 {
 	int ret;
+	u32 flags;
 	struct scmi_xfer *t;
 	struct scmi_msg_resp_perf_domain_attributes *attr;
 
@@ -225,7 +229,7 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
 
 	ret = ph->xops->do_xfer(ph, t);
 	if (!ret) {
-		u32 flags = le32_to_cpu(attr->flags);
+		flags = le32_to_cpu(attr->flags);
 
 		dom_info->set_limits = SUPPORTS_SET_LIMITS(flags);
 		dom_info->set_perf = SUPPORTS_SET_PERF_LVL(flags);
@@ -248,6 +252,16 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
 	}
 
 	ph->xops->xfer_put(ph, t);
+
+	/*
+	 * If supported overwrite short name with the extended one;
+	 * on error just carry on and use already provided short name.
+	 */
+	if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
+	    SUPPORTS_EXTENDED_NAMES(flags))
+		ph->hops->extended_name_get(ph, PERF_DOMAIN_NAME_GET, domain,
+					    dom_info->name, SCMI_MAX_STR_SIZE);
+
 	return ret;
 }
 
@@ -902,7 +916,7 @@ static int scmi_perf_protocol_init(const struct scmi_protocol_handle *ph)
 	for (domain = 0; domain < pinfo->num_domains; domain++) {
 		struct perf_dom_info *dom = pinfo->dom_info + domain;
 
-		scmi_perf_domain_attributes_get(ph, domain, dom);
+		scmi_perf_domain_attributes_get(ph, domain, dom, version);
 		scmi_perf_describe_levels_get(ph, domain, dom);
 
 		if (dom->perf_fastchannels)
diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c
index e378a3eb0d07..964882cc8747 100644
--- a/drivers/firmware/arm_scmi/power.c
+++ b/drivers/firmware/arm_scmi/power.c
@@ -18,6 +18,7 @@ enum scmi_power_protocol_cmd {
 	POWER_STATE_SET = 0x4,
 	POWER_STATE_GET = 0x5,
 	POWER_STATE_NOTIFY = 0x6,
+	POWER_DOMAIN_NAME_GET = 0x8,
 };
 
 struct scmi_msg_resp_power_attributes {
@@ -33,7 +34,8 @@ struct scmi_msg_resp_power_domain_attributes {
 #define SUPPORTS_STATE_SET_NOTIFY(x)	((x) & BIT(31))
 #define SUPPORTS_STATE_SET_ASYNC(x)	((x) & BIT(30))
 #define SUPPORTS_STATE_SET_SYNC(x)	((x) & BIT(29))
-	    u8 name[SCMI_MAX_STR_SIZE];
+#define SUPPORTS_EXTENDED_NAMES(x)	((x) & BIT(27))
+	    u8 name[SCMI_SHORT_NAME_MAX_SIZE];
 };
 
 struct scmi_power_set_state {
@@ -97,9 +99,11 @@ static int scmi_power_attributes_get(const struct scmi_protocol_handle *ph,
 
 static int
 scmi_power_domain_attributes_get(const struct scmi_protocol_handle *ph,
-				 u32 domain, struct power_dom_info *dom_info)
+				 u32 domain, struct power_dom_info *dom_info,
+				 u32 version)
 {
 	int ret;
+	u32 flags;
 	struct scmi_xfer *t;
 	struct scmi_msg_resp_power_domain_attributes *attr;
 
@@ -113,15 +117,26 @@ scmi_power_domain_attributes_get(const struct scmi_protocol_handle *ph,
 
 	ret = ph->xops->do_xfer(ph, t);
 	if (!ret) {
-		u32 flags = le32_to_cpu(attr->flags);
+		flags = le32_to_cpu(attr->flags);
 
 		dom_info->state_set_notify = SUPPORTS_STATE_SET_NOTIFY(flags);
 		dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
 		dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
 		strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
 	}
-
 	ph->xops->xfer_put(ph, t);
+
+	/*
+	 * If supported overwrite short name with the extended one;
+	 * on error just carry on and use already provided short name.
+	 */
+	if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
+	    SUPPORTS_EXTENDED_NAMES(flags)) {
+		ph->hops->extended_name_get(ph, POWER_DOMAIN_NAME_GET,
+					    domain, dom_info->name,
+					    SCMI_MAX_STR_SIZE);
+	}
+
 	return ret;
 }
 
@@ -308,7 +323,7 @@ static int scmi_power_protocol_init(const struct scmi_protocol_handle *ph)
 	for (domain = 0; domain < pinfo->num_domains; domain++) {
 		struct power_dom_info *dom = pinfo->dom_info + domain;
 
-		scmi_power_domain_attributes_get(ph, domain, dom);
+		scmi_power_domain_attributes_get(ph, domain, dom, version);
 	}
 
 	pinfo->version = version;
diff --git a/drivers/firmware/arm_scmi/protocols.h b/drivers/firmware/arm_scmi/protocols.h
index 5461fa333152..60ea880b3855 100644
--- a/drivers/firmware/arm_scmi/protocols.h
+++ b/drivers/firmware/arm_scmi/protocols.h
@@ -24,6 +24,8 @@
 
 #include <asm/unaligned.h>
 
+#define SCMI_SHORT_NAME_MAX_SIZE	16
+
 #define PROTOCOL_REV_MINOR_MASK	GENMASK(15, 0)
 #define PROTOCOL_REV_MAJOR_MASK	GENMASK(31, 16)
 #define PROTOCOL_REV_MAJOR(x)	((u16)(FIELD_GET(PROTOCOL_REV_MAJOR_MASK, (x))))
diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c
index cc465632aa1a..a420a9102094 100644
--- a/drivers/firmware/arm_scmi/reset.c
+++ b/drivers/firmware/arm_scmi/reset.c
@@ -17,6 +17,7 @@ enum scmi_reset_protocol_cmd {
 	RESET_DOMAIN_ATTRIBUTES = 0x3,
 	RESET = 0x4,
 	RESET_NOTIFY = 0x5,
+	RESET_DOMAIN_NAME_GET = 0x6,
 };
 
 #define NUM_RESET_DOMAIN_MASK	0xffff
@@ -26,8 +27,9 @@ struct scmi_msg_resp_reset_domain_attributes {
 	__le32 attributes;
 #define SUPPORTS_ASYNC_RESET(x)		((x) & BIT(31))
 #define SUPPORTS_NOTIFY_RESET(x)	((x) & BIT(30))
+#define SUPPORTS_EXTENDED_NAMES(x)	((x) & BIT(29))
 	__le32 latency;
-	    u8 name[SCMI_MAX_STR_SIZE];
+	u8 name[SCMI_SHORT_NAME_MAX_SIZE];
 };
 
 struct scmi_msg_reset_domain_reset {
@@ -89,9 +91,11 @@ static int scmi_reset_attributes_get(const struct scmi_protocol_handle *ph,
 
 static int
 scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph,
-				 u32 domain, struct reset_dom_info *dom_info)
+				 u32 domain, struct reset_dom_info *dom_info,
+				 u32 version)
 {
 	int ret;
+	u32 attributes;
 	struct scmi_xfer *t;
 	struct scmi_msg_resp_reset_domain_attributes *attr;
 
@@ -105,7 +109,7 @@ scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph,
 
 	ret = ph->xops->do_xfer(ph, t);
 	if (!ret) {
-		u32 attributes = le32_to_cpu(attr->attributes);
+		attributes = le32_to_cpu(attr->attributes);
 
 		dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
 		dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
@@ -116,6 +120,16 @@ scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph,
 	}
 
 	ph->xops->xfer_put(ph, t);
+
+	/*
+	 * If supported overwrite short name with the extended one;
+	 * on error just carry on and use already provided short name.
+	 */
+	if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
+	    SUPPORTS_EXTENDED_NAMES(attributes))
+		ph->hops->extended_name_get(ph, RESET_DOMAIN_NAME_GET, domain,
+					    dom_info->name, SCMI_MAX_STR_SIZE);
+
 	return ret;
 }
 
@@ -320,7 +334,7 @@ static int scmi_reset_protocol_init(const struct scmi_protocol_handle *ph)
 	for (domain = 0; domain < pinfo->num_domains; domain++) {
 		struct reset_dom_info *dom = pinfo->dom_info + domain;
 
-		scmi_reset_domain_attributes_get(ph, domain, dom);
+		scmi_reset_domain_attributes_get(ph, domain, dom, version);
 	}
 
 	pinfo->version = version;
diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
index 07c28e249f0c..6fd8b3a874ea 100644
--- a/drivers/firmware/arm_scmi/sensors.c
+++ b/drivers/firmware/arm_scmi/sensors.c
@@ -27,6 +27,7 @@ enum scmi_sensor_protocol_cmd {
 	SENSOR_CONFIG_GET = 0x9,
 	SENSOR_CONFIG_SET = 0xA,
 	SENSOR_CONTINUOUS_UPDATE_NOTIFY = 0xB,
+	SENSOR_NAME_GET = 0xC,
 };
 
 struct scmi_msg_resp_sensor_attributes {
@@ -71,6 +72,7 @@ struct scmi_msg_resp_sensor_description {
 		__le32 attributes_low;
 /* Common attributes_low macros */
 #define SUPPORTS_ASYNC_READ(x)		FIELD_GET(BIT(31), (x))
+#define SUPPORTS_EXTENDED_NAMES(x)	FIELD_GET(BIT(29), (x))
 #define NUM_TRIP_POINTS(x)		FIELD_GET(GENMASK(7, 0), (x))
 		__le32 attributes_high;
 /* Common attributes_high macros */
@@ -78,7 +80,7 @@ struct scmi_msg_resp_sensor_description {
 #define SENSOR_SCALE_SIGN		BIT(4)
 #define SENSOR_SCALE_EXTEND		GENMASK(31, 5)
 #define SENSOR_TYPE(x)			FIELD_GET(GENMASK(7, 0), (x))
-		u8 name[SCMI_MAX_STR_SIZE];
+		u8 name[SCMI_SHORT_NAME_MAX_SIZE];
 		/* only for version > 2.0 */
 		__le32 power;
 		__le32 resolution;
@@ -519,6 +521,17 @@ static int scmi_sensor_description_get(const struct scmi_protocol_handle *ph,
 					    SCMI_MAX_NUM_SENSOR_AXIS);
 			strlcpy(s->name, sdesc->name, SCMI_MAX_STR_SIZE);
 
+			/*
+			 * If supported overwrite short name with the extended
+			 * one; on error just carry on and use already provided
+			 * short name.
+			 */
+			if (PROTOCOL_REV_MAJOR(si->version) >= 0x3 &&
+			    SUPPORTS_EXTENDED_NAMES(attrl))
+				ph->hops->extended_name_get(ph, SENSOR_NAME_GET,
+							    s->id, s->name,
+							    SCMI_MAX_STR_SIZE);
+
 			if (s->extended_scalar_attrs) {
 				s->sensor_power = le32_to_cpu(sdesc->power);
 				dsize += sizeof(sdesc->power);
diff --git a/drivers/firmware/arm_scmi/voltage.c b/drivers/firmware/arm_scmi/voltage.c
index 7aa887a7cbd2..5d58ba724eeb 100644
--- a/drivers/firmware/arm_scmi/voltage.c
+++ b/drivers/firmware/arm_scmi/voltage.c
@@ -21,13 +21,15 @@ enum scmi_voltage_protocol_cmd {
 	VOLTAGE_CONFIG_GET = 0x6,
 	VOLTAGE_LEVEL_SET = 0x7,
 	VOLTAGE_LEVEL_GET = 0x8,
+	VOLTAGE_DOMAIN_NAME_GET = 0x09,
 };
 
 #define NUM_VOLTAGE_DOMAINS(x)	((u16)(FIELD_GET(VOLTAGE_DOMS_NUM_MASK, (x))))
 
 struct scmi_msg_resp_domain_attributes {
 	__le32 attr;
-	u8 name[SCMI_MAX_STR_SIZE];
+#define SUPPORTS_EXTENDED_NAMES(x)	((x) & BIT(30))
+	u8 name[SCMI_SHORT_NAME_MAX_SIZE];
 };
 
 struct scmi_msg_cmd_describe_levels {
@@ -149,6 +151,16 @@ static int scmi_voltage_descriptors_get(const struct scmi_protocol_handle *ph,
 		v->attributes = le32_to_cpu(resp_dom->attr);
 		strlcpy(v->name, resp_dom->name, SCMI_MAX_STR_SIZE);
 
+		/*
+		 * If supported overwrite short name with the extended one;
+		 * on error just carry on and use already provided short name.
+		 */
+		if (PROTOCOL_REV_MAJOR(vinfo->version) >= 0x2 &&
+		    SUPPORTS_EXTENDED_NAMES(v->attributes))
+			ph->hops->extended_name_get(ph, VOLTAGE_DOMAIN_NAME_GET,
+						    v->id, v->name,
+						    SCMI_MAX_STR_SIZE);
+
 		cmd = tl->tx.buf;
 		/* ...then retrieve domain levels descriptions */
 		do {
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index ced37d1de1fe..56e6f13355b8 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -13,7 +13,7 @@
 #include <linux/notifier.h>
 #include <linux/types.h>
 
-#define SCMI_MAX_STR_SIZE	16
+#define SCMI_MAX_STR_SIZE	64
 #define SCMI_MAX_NUM_RATES	16
 
 /**