v4.19.13 snapshot.
diff --git a/drivers/pci/hotplug/rpaphp_slot.c b/drivers/pci/hotplug/rpaphp_slot.c
new file mode 100644
index 0000000..b916c8e
--- /dev/null
+++ b/drivers/pci/hotplug/rpaphp_slot.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * RPA Virtual I/O device functions
+ * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
+ *
+ * All rights reserved.
+ *
+ * Send feedback to <lxie@us.ibm.com>
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sysfs.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include <asm/rtas.h>
+#include "rpaphp.h"
+
+/* free up the memory used by a slot */
+void dealloc_slot_struct(struct slot *slot)
+{
+ kfree(slot->hotplug_slot->info);
+ kfree(slot->name);
+ kfree(slot->hotplug_slot);
+ kfree(slot);
+}
+
+struct slot *alloc_slot_struct(struct device_node *dn,
+ int drc_index, char *drc_name, int power_domain)
+{
+ struct slot *slot;
+
+ slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
+ if (!slot)
+ goto error_nomem;
+ slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
+ if (!slot->hotplug_slot)
+ goto error_slot;
+ slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
+ GFP_KERNEL);
+ if (!slot->hotplug_slot->info)
+ goto error_hpslot;
+ slot->name = kstrdup(drc_name, GFP_KERNEL);
+ if (!slot->name)
+ goto error_info;
+ slot->dn = dn;
+ slot->index = drc_index;
+ slot->power_domain = power_domain;
+ slot->hotplug_slot->private = slot;
+ slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
+
+ return (slot);
+
+error_info:
+ kfree(slot->hotplug_slot->info);
+error_hpslot:
+ kfree(slot->hotplug_slot);
+error_slot:
+ kfree(slot);
+error_nomem:
+ return NULL;
+}
+
+static int is_registered(struct slot *slot)
+{
+ struct slot *tmp_slot;
+
+ list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
+ if (!strcmp(tmp_slot->name, slot->name))
+ return 1;
+ }
+ return 0;
+}
+
+int rpaphp_deregister_slot(struct slot *slot)
+{
+ int retval = 0;
+ struct hotplug_slot *php_slot = slot->hotplug_slot;
+
+ dbg("%s - Entry: deregistering slot=%s\n",
+ __func__, slot->name);
+
+ list_del(&slot->rpaphp_slot_list);
+ pci_hp_deregister(php_slot);
+ dealloc_slot_struct(slot);
+
+ dbg("%s - Exit: rc[%d]\n", __func__, retval);
+ return retval;
+}
+EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
+
+int rpaphp_register_slot(struct slot *slot)
+{
+ struct hotplug_slot *php_slot = slot->hotplug_slot;
+ struct device_node *child;
+ u32 my_index;
+ int retval;
+ int slotno = -1;
+
+ dbg("%s registering slot:path[%pOF] index[%x], name[%s] pdomain[%x] type[%d]\n",
+ __func__, slot->dn, slot->index, slot->name,
+ slot->power_domain, slot->type);
+
+ /* should not try to register the same slot twice */
+ if (is_registered(slot)) {
+ err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
+ return -EAGAIN;
+ }
+
+ for_each_child_of_node(slot->dn, child) {
+ retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
+ if (my_index == slot->index) {
+ slotno = PCI_SLOT(PCI_DN(child)->devfn);
+ of_node_put(child);
+ break;
+ }
+ }
+
+ retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
+ if (retval) {
+ err("pci_hp_register failed with error %d\n", retval);
+ return retval;
+ }
+
+ /* add slot to our internal list */
+ list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
+ info("Slot [%s] registered\n", slot->name);
+ return 0;
+}