diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h
index a6014e9a7113..7a58c10ce421 100644
--- a/include/acpi/actbl3.h
+++ b/include/acpi/actbl3.h
@@ -190,7 +190,8 @@ enum acpi_srat_type {
 	ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY = 2,
 	ACPI_SRAT_TYPE_GICC_AFFINITY = 3,
 	ACPI_SRAT_TYPE_GIC_ITS_AFFINITY = 4,	/* ACPI 6.2 */
-	ACPI_SRAT_TYPE_RESERVED = 5	/* 5 and greater are reserved */
+	ACPI_SRAT_TYPE_GENERIC_AFFINITY = 5,	/* ACPI 6.3 */
+	ACPI_SRAT_TYPE_RESERVED = 6	/* 5 and greater are reserved */
 };
 
 /*
@@ -271,6 +272,22 @@ struct acpi_srat_gic_its_affinity {
 	u32 its_id;
 };
 
+/* 5: Generic Initiator Affinity Structure (ACPI 6.3) */
+
+struct acpi_srat_generic_affinity {
+	struct acpi_subtable_header header;
+	u8 reserved;
+	u8 device_handle_type;
+	u32 proximity_domain;
+	u8 device_handle[16];
+	u32 flags;
+	u32 reserved1;
+};
+
+/* Flags for struct acpi_srat_generic_affinity */
+
+#define ACPI_SRAT_GENERIC_AFFINITY_ENABLED (1)	/* 00: Use affinity structure */
+
 /*******************************************************************************
  *
  * STAO - Status Override Table (_STA override) - ACPI 6.0