diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
index 8b391f12853bb..e549914a636c6 100644
--- a/drivers/acpi/prmt.c
+++ b/drivers/acpi/prmt.c
@@ -69,7 +69,7 @@ struct prm_module_info {
 	bool updatable;
 
 	struct list_head module_list;
-	struct prm_handler_info handlers[];
+	struct prm_handler_info handlers[] __counted_by(handler_count);
 };
 
 static u64 efi_pa_va_lookup(efi_guid_t *guid, u64 pa)
@@ -224,6 +224,30 @@ static struct prm_handler_info *find_prm_handler(const guid_t *guid)
 #define UPDATE_LOCK_ALREADY_HELD 	4
 #define UPDATE_UNLOCK_WITHOUT_LOCK 	5
 
+int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer)
+{
+	struct prm_handler_info *handler = find_prm_handler(&handler_guid);
+	struct prm_module_info *module = find_prm_module(&handler_guid);
+	struct prm_context_buffer context;
+	efi_status_t status;
+
+	if (!module || !handler)
+		return -ENODEV;
+
+	memset(&context, 0, sizeof(context));
+	ACPI_COPY_NAMESEG(context.signature, "PRMC");
+	context.identifier         = handler->guid;
+	context.static_data_buffer = handler->static_data_buffer_addr;
+	context.mmio_ranges        = module->mmio_info;
+
+	status = efi_call_acpi_prm_handler(handler->handler_addr,
+					   (u64)param_buffer,
+					   &context);
+
+	return efi_status_to_err(status);
+}
+EXPORT_SYMBOL_GPL(acpi_call_prm_handler);
+
 /*
  * This is the PlatformRtMechanism opregion space handler.
  * @function: indicates the read/write. In fact as the PlatformRtMechanism
@@ -263,9 +287,7 @@ static acpi_status acpi_platformrt_space_handler(u32 function,
 		if (!handler || !module)
 			goto invalid_guid;
 
-		if (!handler->handler_addr ||
-		    !handler->static_data_buffer_addr ||
-		    !handler->acpi_param_buffer_addr) {
+		if (!handler->handler_addr) {
 			buffer->prm_status = PRM_HANDLER_ERROR;
 			return AE_OK;
 		}
diff --git a/include/linux/prmt.h b/include/linux/prmt.h
index 24da8364b9197..9c094294403ff 100644
--- a/include/linux/prmt.h
+++ b/include/linux/prmt.h
@@ -2,6 +2,11 @@
 
 #ifdef CONFIG_ACPI_PRMT
 void init_prmt(void);
+int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer);
 #else
 static inline void init_prmt(void) { }
+static inline int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer)
+{
+	return -EOPNOTSUPP;
+}
 #endif