[PATCH v2 02/11] firmware: arm_scmi: Extend perf protocol ops to get information of a domain

[Ulf Hansson]

Similar to other protocol ops, it's useful for an scmi module driver to get
some generic information of a performance domain. Therefore, let's add a
new callback to provide this information. The information is currently
limited to the name of the performance domain and whether the set-level
operation is supported, although this can easily be extended if we find the
need for it.

Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
---

Changes in v2:
	- New patch (replacing two earlier patches).

---
 drivers/firmware/arm_scmi/perf.c | 21 ++++++++++++++++-----
 include/linux/scmi_protocol.h    |  8 ++++++++
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index cf7f0de4d6db..f3ea96dd845c 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -124,7 +124,6 @@ struct scmi_msg_resp_perf_describe_levels {
 
 struct perf_dom_info {
 	bool set_limits;
-	bool set_perf;
 	bool perf_limit_notify;
 	bool perf_level_notify;
 	bool perf_fastchannels;
@@ -132,7 +131,7 @@ struct perf_dom_info {
 	u32 sustained_freq_khz;
 	u32 sustained_perf_level;
 	u32 mult_factor;
-	char name[SCMI_MAX_STR_SIZE];
+	struct scmi_perf_domain_info info;
 	struct scmi_opp opp[MAX_OPPS];
 	struct scmi_fc_info *fc_info;
 };
@@ -209,7 +208,7 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
 		flags = le32_to_cpu(attr->flags);
 
 		dom_info->set_limits = SUPPORTS_SET_LIMITS(flags);
-		dom_info->set_perf = SUPPORTS_SET_PERF_LVL(flags);
+		dom_info->info.set_perf = SUPPORTS_SET_PERF_LVL(flags);
 		dom_info->perf_limit_notify = SUPPORTS_PERF_LIMIT_NOTIFY(flags);
 		dom_info->perf_level_notify = SUPPORTS_PERF_LEVEL_NOTIFY(flags);
 		dom_info->perf_fastchannels = SUPPORTS_PERF_FASTCHANNELS(flags);
@@ -225,7 +224,8 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
 			dom_info->mult_factor =
 					(dom_info->sustained_freq_khz * 1000) /
 					dom_info->sustained_perf_level;
-		strscpy(dom_info->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
+		strscpy(dom_info->info.name, attr->name,
+			SCMI_SHORT_NAME_MAX_SIZE);
 	}
 
 	ph->xops->xfer_put(ph, t);
@@ -237,7 +237,8 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
 	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);
+					    dom_info->info.name,
+					    SCMI_MAX_STR_SIZE);
 
 	return ret;
 }
@@ -340,6 +341,15 @@ static int scmi_perf_num_domains_get(const struct scmi_protocol_handle *ph)
 	return pi->num_domains;
 }
 
+static const struct scmi_perf_domain_info *
+scmi_perf_domain_info_get(const struct scmi_protocol_handle *ph, u32 domain)
+{
+	struct scmi_perf_info *pi = ph->get_priv(ph);
+	struct perf_dom_info *dom = pi->dom_info + domain;
+
+	return &dom->info;
+}
+
 static int scmi_perf_mb_limits_set(const struct scmi_protocol_handle *ph,
 				   u32 domain, u32 max_perf, u32 min_perf)
 {
@@ -695,6 +705,7 @@ scmi_power_scale_get(const struct scmi_protocol_handle *ph)
 
 static const struct scmi_perf_proto_ops perf_proto_ops = {
 	.num_domains_get = scmi_perf_num_domains_get,
+	.domain_info_get = scmi_perf_domain_info_get,
 	.limits_set = scmi_perf_limits_set,
 	.limits_get = scmi_perf_limits_get,
 	.level_set = scmi_perf_level_set,
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 71b39cbbdace..ed032fe83c28 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -97,11 +97,17 @@ struct scmi_clk_proto_ops {
 			      u32 clk_id);
 };
 
+struct scmi_perf_domain_info {
+	char name[SCMI_MAX_STR_SIZE];
+	bool set_perf;
+};
+
 /**
  * struct scmi_perf_proto_ops - represents the various operations provided
  *	by SCMI Performance Protocol
  *
  * @num_domains_get: gets the number of supported performance domains
+ * @domain_info_get: get the information of a performance domain
  * @limits_set: sets limits on the performance level of a domain
  * @limits_get: gets limits on the performance level of a domain
  * @level_set: sets the performance level of a domain
@@ -122,6 +128,8 @@ struct scmi_clk_proto_ops {
  */
 struct scmi_perf_proto_ops {
 	int (*num_domains_get)(const struct scmi_protocol_handle *ph);
+	const struct scmi_perf_domain_info __must_check *(*domain_info_get)
+		(const struct scmi_protocol_handle *ph, u32 domain);
 	int (*limits_set)(const struct scmi_protocol_handle *ph, u32 domain,
 			  u32 max_perf, u32 min_perf);
 	int (*limits_get)(const struct scmi_protocol_handle *ph, u32 domain,
-- 
2.34.1