drmgr/SLOT: Add kernel interface support for device tree update

Use the following kernel interfaces for SLOT device type to update
the device tree if this feature is enabled in the kernel.

dt add index <DRC index>  --> for IO add
dt remove index <DRC index> --> for IO remove

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>

Author: hmyneni

src/drmgr/drslot_chrp_slot.c

@@ -71,7 +71,10 @@ release_slot(struct dr_node *slot)
 	if (rc)
 		return rc;
 
-	rc = remove_device_tree_nodes(slot->ofdt_path);
+	if (kernel_dlpar_exists())
+		rc = do_dt_kernel_dlpar(slot->drc_index, REMOVE);
+	else
+		rc = remove_device_tree_nodes(slot->ofdt_path);
 	if (rc) {
 		acquire_drc(slot->drc_index);
 		return rc;
@@ -160,7 +163,6 @@ static int
 acquire_slot(char *drc_name, struct dr_node **slot)
 {
 	struct dr_connector drc;
-	struct of_node *of_nodes;
 	char path[DR_PATH_MAX];
 	int rc;
 
@@ -180,14 +182,21 @@ acquire_slot(char *drc_name, struct dr_node **slot)
 	if (rc)
 		return rc;
 
-	of_nodes = configure_connector(drc.index);
-	if (of_nodes == NULL) {
-		release_drc(drc.index, PCI_DLPAR_DEV);
-		return -1;
+	if (kernel_dlpar_exists()) {
+		rc = do_dt_kernel_dlpar(drc.index, ADD);
+	} else {
+		struct of_node *of_nodes;
+
+		of_nodes = configure_connector(drc.index);
+		if (of_nodes == NULL) {
+			release_drc(drc.index, PCI_DLPAR_DEV);
+			return -1;
+		}
+
+		rc = add_device_tree_nodes(path, of_nodes);
+		free_of_node(of_nodes);
 	}
 
-	rc = add_device_tree_nodes(path, of_nodes);
-	free_of_node(of_nodes);
 	if (rc) {
 		say(ERROR, "add_device_tree_nodes failed at %s\n", path);
 		release_drc(drc.index, PCI_DLPAR_DEV);