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

Use the following kernel interfaces for PCI 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 <[email protected]>
Signed-off-by: Tyrel Datwyler <[email protected]>

src/drmgr/drslot_chrp_pci.c

@@ -377,7 +377,6 @@ static int add_work(struct dr_node *node, bool partner_device)
 					/* on when	 */
 	int iso_state = ISOLATE;	/* Tells us isolation state after */
 	int rc;
-	struct of_node *new_nodes;/* nodes returned from configure_connector */
 
 	/*
 	 * Already checked the card presence for the original device
@@ -445,16 +444,26 @@ static int add_work(struct dr_node *node, bool partner_device)
 	 * the return status requires a message, print it out
 	 * and exit, otherwise, add the nodes to the OF tree.
 	 */
-	new_nodes = configure_connector(node->drc_index);
-	if (new_nodes == NULL) {
-		rtas_set_indicator(ISOLATION_STATE, node->drc_index, ISOLATE);
-		set_power(node->drc_power, POWER_OFF);
-		return -1;
+	if (kernel_dlpar_exists()) {
+		rc = do_dt_kernel_dlpar(node->drc_index, ADD);
+	} else {
+		struct of_node *new_nodes; /* nodes returned from */
+					   /* configure_connector */
+
+		new_nodes = configure_connector(node->drc_index);
+		if (new_nodes == NULL) {
+			rtas_set_indicator(ISOLATION_STATE, node->drc_index,
+					ISOLATE);
+			set_power(node->drc_power, POWER_OFF);
+			return -1;
+		}
+
+		say(DEBUG, "Adding %s to %s\n", new_nodes->name,
+				node->ofdt_path);
+		rc = add_device_tree_nodes(node->ofdt_path, new_nodes);
+		free_of_node(new_nodes);
 	}
 
-	say(DEBUG, "Adding %s to %s\n", new_nodes->name, node->ofdt_path);
-	rc = add_device_tree_nodes(node->ofdt_path, new_nodes);
-	free_of_node(new_nodes);
 	if (rc) {
 		say(DEBUG, "add_device_tree_nodes failed at %s\n",
 		    node->ofdt_path);
@@ -786,7 +795,10 @@ static int remove_work(struct dr_node *node, bool partner_device)
 	 * the device tree.
 	 */
 	for (child = node->children; child; child = child->next) {
-		rc = remove_device_tree_nodes(child->ofdt_path);
+		if (kernel_dlpar_exists())
+			rc = do_dt_kernel_dlpar(child->drc_index, REMOVE);
+		else
+			rc = remove_device_tree_nodes(child->ofdt_path);
 		if (rc) {
 			say(ERROR, "%s", sw_error);
 			rtas_set_indicator(ISOLATION_STATE, node->drc_index,