1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * RPA Virtual I/O device functions
4 * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
5 *
6 * All rights reserved.
7 *
8 * Send feedback to <lxie@us.ibm.com>
9 *
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/sysfs.h>
14#include <linux/of.h>
15#include <linux/pci.h>
16#include <linux/string.h>
17#include <linux/slab.h>
18
19#include <asm/rtas.h>
20#include "rpaphp.h"
21
22/* free up the memory used by a slot */
23void dealloc_slot_struct(struct slot *slot)
24{
25 of_node_put(node: slot->dn);
26 kfree(objp: slot->name);
27 kfree(objp: slot);
28}
29
30struct slot *alloc_slot_struct(struct device_node *dn,
31 int drc_index, char *drc_name, int power_domain)
32{
33 struct slot *slot;
34
35 slot = kzalloc(size: sizeof(struct slot), GFP_KERNEL);
36 if (!slot)
37 goto error_nomem;
38 slot->name = kstrdup(s: drc_name, GFP_KERNEL);
39 if (!slot->name)
40 goto error_slot;
41 slot->dn = of_node_get(node: dn);
42 slot->index = drc_index;
43 slot->power_domain = power_domain;
44 slot->hotplug_slot.ops = &rpaphp_hotplug_slot_ops;
45
46 return (slot);
47
48error_slot:
49 kfree(objp: slot);
50error_nomem:
51 return NULL;
52}
53
54static int is_registered(struct slot *slot)
55{
56 struct slot *tmp_slot;
57
58 list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
59 if (!strcmp(tmp_slot->name, slot->name))
60 return 1;
61 }
62 return 0;
63}
64
65int rpaphp_deregister_slot(struct slot *slot)
66{
67 int retval = 0;
68 struct hotplug_slot *php_slot = &slot->hotplug_slot;
69
70 dbg("%s - Entry: deregistering slot=%s\n",
71 __func__, slot->name);
72
73 list_del(entry: &slot->rpaphp_slot_list);
74 pci_hp_deregister(slot: php_slot);
75 dealloc_slot_struct(slot);
76
77 dbg("%s - Exit: rc[%d]\n", __func__, retval);
78 return retval;
79}
80EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
81
82int rpaphp_register_slot(struct slot *slot)
83{
84 struct hotplug_slot *php_slot = &slot->hotplug_slot;
85 struct device_node *child;
86 u32 my_index;
87 int retval;
88 int slotno = -1;
89
90 dbg("%s registering slot:path[%pOF] index[%x], name[%s] pdomain[%x] type[%d]\n",
91 __func__, slot->dn, slot->index, slot->name,
92 slot->power_domain, slot->type);
93
94 /* should not try to register the same slot twice */
95 if (is_registered(slot)) {
96 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
97 return -EAGAIN;
98 }
99
100 for_each_child_of_node(slot->dn, child) {
101 retval = of_property_read_u32(np: child, propname: "ibm,my-drc-index", out_value: &my_index);
102 if (my_index == slot->index) {
103 slotno = PCI_SLOT(PCI_DN(child)->devfn);
104 of_node_put(node: child);
105 break;
106 }
107 }
108
109 retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
110 if (retval) {
111 err("pci_hp_register failed with error %d\n", retval);
112 return retval;
113 }
114
115 /* add slot to our internal list */
116 list_add(new: &slot->rpaphp_slot_list, head: &rpaphp_slot_head);
117 info("Slot [%s] registered\n", slot->name);
118 return 0;
119}
120

source code of linux/drivers/pci/hotplug/rpaphp_slot.c