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