1 // SPDX-License-Identifier: GPL-2.0+
3 * RPA Virtual I/O device functions
4 * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
8 * Send feedback to <lxie@us.ibm.com>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/sysfs.h>
14 #include <linux/pci.h>
15 #include <linux/string.h>
16 #include <linux/slab.h>
21 /* free up the memory used by a slot */
22 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
24 struct slot *slot = (struct slot *) hotplug_slot->private;
25 dealloc_slot_struct(slot);
28 void dealloc_slot_struct(struct slot *slot)
30 kfree(slot->hotplug_slot->info);
32 kfree(slot->hotplug_slot);
36 struct slot *alloc_slot_struct(struct device_node *dn,
37 int drc_index, char *drc_name, int power_domain)
41 slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
44 slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
45 if (!slot->hotplug_slot)
47 slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
49 if (!slot->hotplug_slot->info)
51 slot->name = kstrdup(drc_name, GFP_KERNEL);
55 slot->index = drc_index;
56 slot->power_domain = power_domain;
57 slot->hotplug_slot->private = slot;
58 slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
59 slot->hotplug_slot->release = &rpaphp_release_slot;
64 kfree(slot->hotplug_slot->info);
66 kfree(slot->hotplug_slot);
73 static int is_registered(struct slot *slot)
75 struct slot *tmp_slot;
77 list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
78 if (!strcmp(tmp_slot->name, slot->name))
84 int rpaphp_deregister_slot(struct slot *slot)
87 struct hotplug_slot *php_slot = slot->hotplug_slot;
89 dbg("%s - Entry: deregistering slot=%s\n",
90 __func__, slot->name);
92 list_del(&slot->rpaphp_slot_list);
94 retval = pci_hp_deregister(php_slot);
96 err("Problem unregistering a slot %s\n", slot->name);
98 dbg("%s - Exit: rc[%d]\n", __func__, retval);
101 EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
103 int rpaphp_register_slot(struct slot *slot)
105 struct hotplug_slot *php_slot = slot->hotplug_slot;
106 struct device_node *child;
111 dbg("%s registering slot:path[%pOF] index[%x], name[%s] pdomain[%x] type[%d]\n",
112 __func__, slot->dn, slot->index, slot->name,
113 slot->power_domain, slot->type);
115 /* should not try to register the same slot twice */
116 if (is_registered(slot)) {
117 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
121 for_each_child_of_node(slot->dn, child) {
122 retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
123 if (my_index == slot->index) {
124 slotno = PCI_SLOT(PCI_DN(child)->devfn);
130 retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
132 err("pci_hp_register failed with error %d\n", retval);
136 /* add slot to our internal list */
137 list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
138 info("Slot [%s] registered\n", slot->name);