hdata/slots: Apply slot label to the parent slot

Slot names only really make sense when applied to an actual slot rather
than a device. On witherspoon the GPU devices have a name associated with
the device rather than the slot for the GPUs. Add a hack that moves the
slot label to the parent slot rather than on the device itself.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

hdata/iohub.c

@@ -757,9 +757,23 @@ static void parse_one_slot(const struct slot_map_entry *entry,
 		dt_add_property_cells(node, "lanes-reversed",
 				be16_to_cpu(entry->lane_reverse));
 
-	if (strnlen(entry->name, sizeof(entry->name)))
+	if (strnlen(entry->name, sizeof(entry->name))) {
+		/*
+		 * HACK: On some platforms (witherspoon) the slot label is
+		 * applied to the device rather than the pcie downstream port
+		 * that has the slot under it. Hack around this by moving the
+		 * slot label up if the parent port doesn't have one.
+		 */
+		if (dt_node_is_compatible(node->parent, "ibm,pcie-port") &&
+		    !dt_find_property(node->parent, "ibm,slot-label")) {
+			dt_add_property_nstr(node->parent, "ibm,slot-label",
+					entry->name, sizeof(entry->name));
+		}
+
 		dt_add_property_nstr(node, "ibm,slot-label",
 				entry->name, sizeof(entry->name));
+	}
+
 	if (entry->type == st_slot || entry->type == st_rc_slot)
 		dt_add_property(node, "ibm,pluggable", NULL, 0);
 

hdata/spira.c

@@ -1529,7 +1529,13 @@ static void add_npu(struct dt_node *xscom, const struct HDIF_array_hdr *links,
 				continue;
 			}
 
-			name = dt_prop_get_def(slot, "ibm,slot-label",
+			/*
+			 * The slot_id points to a node that indicates that
+			 * this GPU should appear under the slot. Grab the
+			 * slot-label from the parent node that represents
+			 * the actual slot.
+			 */
+			name = dt_prop_get_def(slot->parent, "ibm,slot-label",
 						(char *)"<SLOT NAME MISSING>");
 
 			prlog(PR_DEBUG, "NPU: %04x:%d: Target slot %s\n",