drmgr/phb: Add multipath partner device support for remove

The PHB node can have "ibm,multipath-partner-drc" property
which means the device can be also configured with multipath
partner path. This property provides the DRC index of the
partner device. For the hotplug removal, both paths should
be removed and the following steps will be executed:

- Find the partner path DRC index from "ibm,multipath-partner-drc"
  property for the specified device
- If the partner path is configured, notify user about the
  removal of partner path if available. Then the user should issue
  issue separate drmgr command to remove the partner path.
- Remove the primary path

Signed-off-by: Haren Myneni <[email protected]>
Signed-off-by: Tyrel Datwyler <[email protected]>

src/drmgr/drslot_chrp_phb.c

@@ -283,9 +283,11 @@ static int disable_os_hp_children(struct dr_node *phb)
  */
 static int remove_phb(void)
 {
-	struct dr_node *phb;
+	struct dr_node *phb, *partner_phb = NULL;
 	struct dr_node *child;
 	struct dr_node *hp_list = NULL;
+	uint32_t partner_drc_index = 0;
+	char drc_index_str[10];
 	int rc = 0;
 
 	phb = get_node_by_name(usr_drc_name, PHB_NODES);
@@ -305,6 +307,20 @@ static int remove_phb(void)
 		goto phb_remove_error;
 	}
 
+	/* Find the multipath partner device index if available */
+	rc = get_my_partner_drc_index(phb, &partner_drc_index);
+	if (!rc && partner_drc_index) {
+		sprintf(drc_index_str, "%d", partner_drc_index);
+
+		/* Find the partner phb device */
+		partner_phb = get_node_by_name(drc_index_str, PHB_NODES);
+		if (partner_phb) {
+			printf("Partner adapter location : %s",
+					partner_phb->drc_name);
+			printf(" Partner adapter must be removed\n");
+		}
+	}
+
 	/* Now, disable any hotplug children */
 	hp_list = get_hp_nodes();
 
@@ -358,6 +374,9 @@ static int remove_phb(void)
 	if (phb)
 		free_node(phb);
 
+	if (partner_phb)
+		free_node(partner_phb);
+
 	if (hp_list)
 		free_node(hp_list);