commit 8751abf3cf0eb2733162931a6b38db4431699ebd
Author: Haren Myneni <haren@linux.ibm.com>
Date:   Fri Jun 21 15:42:45 2024 -0700

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

diff --git a/src/drmgr/drslot_chrp_phb.c b/src/drmgr/drslot_chrp_phb.c
index f59baa4..b3a4190 100644
--- a/src/drmgr/drslot_chrp_phb.c
+++ b/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 @@ phb_remove_error:
 	if (phb)
 		free_node(phb);
 
+	if (partner_phb)
+		free_node(partner_phb);
+
 	if (hp_list)
 		free_node(hp_list);