diff --git a/include/sbi_utils/mailbox/rpmi_msgprot.h b/include/sbi_utils/mailbox/rpmi_msgprot.h
index c35788f0..46834877 100644
--- a/include/sbi_utils/mailbox/rpmi_msgprot.h
+++ b/include/sbi_utils/mailbox/rpmi_msgprot.h
@@ -857,6 +857,16 @@ struct rpmi_perf_get_attrs_req {
 
 struct rpmi_perf_get_attrs_resp {
 	s32 status;
+#define RPMI_PERF_DOMAIN_ATTRS_FLAGS_MASK			(7U << 0)
+#define RPMI_PERF_DOMAIN_ATTRS_FLAGS_FASTCHANNEL_SUPP_POS	0
+#define RPMI_PERF_DOMAIN_ATTRS_FLAGS_PERF_LVL_CHG_SUPP_POS	1
+#define RPMI_PERF_DOMAIN_ATTRS_FLAGS_PERF_LIMIT_CHG_SUPP_POS	2
+#define RPMI_PERF_DOMAIN_ATTRS_FLAGS_FASTCHANNEL_SUPP		\
+				(1U << RPMI_PERF_DOMAIN_ATTRS_FLAGS_FASTCHANNEL_SUPP_POS)
+#define RPMI_PERF_DOMAIN_ATTRS_FLAGS_PERF_LVL_CHG_SUPP		\
+				(1U << RPMI_PERF_DOMAIN_ATTRS_FLAGS_PERF_LVL_CHG_SUPP_POS)
+#define RPMI_PERF_DOMAIN_ATTRS_FLAGS_PERF_LIMIT_CHG_SUPP	\
+				(1U << RPMI_PERF_DOMAIN_ATTRS_FLAGS_PERF_LIMIT_CHG_SUPP_POS)
 	u32 flags;
 	u32 num_level;
 	u32 latency;
@@ -936,16 +946,26 @@ struct rpmi_perf_get_fast_chn_attr_req {
 
 struct rpmi_perf_get_fast_chn_attr_resp {
 	s32 status;
+#define RPMI_PERF_FASTCHAN_ATTRS_FLAGS_MASK		(7U << 0)
+#define RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_SUPP_POS	0
+#define RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_WIDTH_POS	1
+#define RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_SUPP		\
+				(1U << RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_SUPP_POS)
+#define RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_WIDTH_MASK	\
+				(3U << RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_WIDTH_POS)
+#define RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_WIDTH_8	\
+				(0U << RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_WIDTH_POS)
+#define RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_WIDTH_16	\
+				(1U << RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_WIDTH_POS)
+#define RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_WIDTH_32	\
+				(2U << RPMI_PERF_FASTCHAN_ATTRS_FLAGS_DB_WIDTH_POS)
 	u32 flags;
 	u32 region_offset_low;
 	u32 region_offset_high;
 	u32 region_size;
 	u32 db_addr_low;
 	u32 db_addr_high;
-	u32 db_id_low;
-	u32 db_id_high;
-	u32 db_perserved_low;
-	u32 db_perserved_high;
+	u32 db_write_value;
 };
 
 /** RPMI MM ServiceGroup Service IDs */