From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 12:05:51 +0200
Subject: Adding upstream version 5.10.209.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/pci/hotplug/rpaphp_slot.c | 118 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 drivers/pci/hotplug/rpaphp_slot.c

(limited to 'drivers/pci/hotplug/rpaphp_slot.c')

diff --git a/drivers/pci/hotplug/rpaphp_slot.c b/drivers/pci/hotplug/rpaphp_slot.c
new file mode 100644
index 000000000..93b4a945c
--- /dev/null
+++ b/drivers/pci/hotplug/rpaphp_slot.c
@@ -0,0 +1,118 @@
+// 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)
+{
+	of_node_put(slot->dn);
+	kfree(slot->name);
+	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->name = kstrdup(drc_name, GFP_KERNEL);
+	if (!slot->name)
+		goto error_slot;
+	slot->dn = of_node_get(dn);
+	slot->index = drc_index;
+	slot->power_domain = power_domain;
+	slot->hotplug_slot.ops = &rpaphp_hotplug_slot_ops;
+
+	return (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;
+}
-- 
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