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 */
dealloc_slot_struct(struct slot * slot)23 void dealloc_slot_struct(struct slot *slot)
24 {
25 of_node_put(slot->dn);
26 kfree(slot->name);
27 kfree(slot);
28 }
29
alloc_slot_struct(struct device_node * dn,int drc_index,char * drc_name,int power_domain)30 struct 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_obj(struct slot);
36 if (!slot)
37 goto error_nomem;
38 slot->name = kstrdup(drc_name, GFP_KERNEL);
39 if (!slot->name)
40 goto error_slot;
41 slot->dn = of_node_get(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
48 error_slot:
49 kfree(slot);
50 error_nomem:
51 return NULL;
52 }
53
is_registered(struct slot * slot)54 static 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
rpaphp_deregister_slot(struct slot * slot)65 int 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(&slot->rpaphp_slot_list);
74 pci_hp_deregister(php_slot);
75 dealloc_slot_struct(slot);
76
77 dbg("%s - Exit: rc[%d]\n", __func__, retval);
78 return retval;
79 }
80 EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
81
rpaphp_register_slot(struct slot * slot)82 int rpaphp_register_slot(struct slot *slot)
83 {
84 struct hotplug_slot *php_slot = &slot->hotplug_slot;
85 u32 my_index;
86 int retval;
87 int slotno = PCI_SLOT_PLACEHOLDER;
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_scoped(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 break;
104 }
105 }
106
107 retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
108 if (retval) {
109 err("pci_hp_register failed with error %d\n", retval);
110 return retval;
111 }
112
113 /* add slot to our internal list */
114 list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
115 info("Slot [%s] registered\n", slot->name);
116 return 0;
117 }
118