[PATCH 1/3] firmware: arm_scmi: Add perf_notify_support interface

[Sibi Sankar <quic_sibis@xxxxxxxxxxx>]

Add a new perf_notify_support interface to the existing perf_ops to export
info regarding limit/level change notification support.

Signed-off-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
---
 drivers/firmware/arm_scmi/perf.c | 16 ++++++++++++++++
 include/linux/scmi_protocol.h    |  8 ++++++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 8ea2a7b3d35d..c167bb5e3607 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -949,6 +949,21 @@ scmi_power_scale_get(const struct scmi_protocol_handle *ph)
 	return pi->power_scale;
 }
 
+static int scmi_notify_support(const struct scmi_protocol_handle *ph, u32 domain,
+			       struct scmi_perf_notify_info *info)
+{
+	struct perf_dom_info *dom;
+
+	dom = scmi_perf_domain_lookup(ph, domain);
+	if (IS_ERR(dom))
+		return -EINVAL;
+
+	info->perf_limit_notify = dom->perf_limit_notify;
+	info->perf_level_notify = dom->perf_level_notify;
+
+	return 0;
+}
+
 static const struct scmi_perf_proto_ops perf_proto_ops = {
 	.num_domains_get = scmi_perf_num_domains_get,
 	.info_get = scmi_perf_info_get,
@@ -963,6 +978,7 @@ static const struct scmi_perf_proto_ops perf_proto_ops = {
 	.est_power_get = scmi_dvfs_est_power_get,
 	.fast_switch_possible = scmi_fast_switch_possible,
 	.power_scale_get = scmi_power_scale_get,
+	.perf_notify_support = scmi_notify_support,
 };
 
 static int scmi_perf_set_notify_enabled(const struct scmi_protocol_handle *ph,
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index f2f05fb42d28..b0947d004826 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -117,6 +117,11 @@ struct scmi_perf_domain_info {
 	bool set_perf;
 };
 
+struct scmi_perf_notify_info {
+	bool perf_limit_notify;
+	bool perf_level_notify;
+};
+
 /**
  * struct scmi_perf_proto_ops - represents the various operations provided
  *	by SCMI Performance Protocol
@@ -139,6 +144,7 @@ struct scmi_perf_domain_info {
  *	for a given device
  * @power_scale_mw_get: indicates if the power values provided are in milliWatts
  *	or in some other (abstract) scale
+ * @perf_notify_support: indicates if limit and level change notification is supported
  */
 struct scmi_perf_proto_ops {
 	int (*num_domains_get)(const struct scmi_protocol_handle *ph);
@@ -165,6 +171,8 @@ struct scmi_perf_proto_ops {
 	bool (*fast_switch_possible)(const struct scmi_protocol_handle *ph,
 				     u32 domain);
 	enum scmi_power_scale (*power_scale_get)(const struct scmi_protocol_handle *ph);
+	int (*perf_notify_support)(const struct scmi_protocol_handle *ph, u32 domain,
+				   struct scmi_perf_notify_info *info);
 };
 
 /**
-- 
2.17.1