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1/*
2 * RPA Virtual I/O device functions
3 * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
4 *
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or (at
10 * your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15 * NON INFRINGEMENT. See the GNU General Public License for more
16 * details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * Send feedback to <lxie@us.ibm.com>
23 *
24 */
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/sysfs.h>
28#include <linux/pci.h>
29#include <linux/string.h>
30#include <linux/slab.h>
31
32#include <asm/rtas.h>
33#include "rpaphp.h"
34
35/* free up the memory used by a slot */
36static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
37{
38 struct slot *slot = (struct slot *) hotplug_slot->private;
39 dealloc_slot_struct(slot);
40}
41
42void dealloc_slot_struct(struct slot *slot)
43{
44 kfree(slot->hotplug_slot->info);
45 kfree(slot->name);
46 kfree(slot->hotplug_slot);
47 kfree(slot);
48}
49
50struct slot *alloc_slot_struct(struct device_node *dn,
51 int drc_index, char *drc_name, int power_domain)
52{
53 struct slot *slot;
54
55 slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
56 if (!slot)
57 goto error_nomem;
58 slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
59 if (!slot->hotplug_slot)
60 goto error_slot;
61 slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
62 GFP_KERNEL);
63 if (!slot->hotplug_slot->info)
64 goto error_hpslot;
65 slot->name = kstrdup(drc_name, GFP_KERNEL);
66 if (!slot->name)
67 goto error_info;
68 slot->dn = dn;
69 slot->index = drc_index;
70 slot->power_domain = power_domain;
71 slot->hotplug_slot->private = slot;
72 slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
73 slot->hotplug_slot->release = &rpaphp_release_slot;
74
75 return (slot);
76
77error_info:
78 kfree(slot->hotplug_slot->info);
79error_hpslot:
80 kfree(slot->hotplug_slot);
81error_slot:
82 kfree(slot);
83error_nomem:
84 return NULL;
85}
86
87static int is_registered(struct slot *slot)
88{
89 struct slot *tmp_slot;
90
91 list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
92 if (!strcmp(tmp_slot->name, slot->name))
93 return 1;
94 }
95 return 0;
96}
97
98int rpaphp_deregister_slot(struct slot *slot)
99{
100 int retval = 0;
101 struct hotplug_slot *php_slot = slot->hotplug_slot;
102
103 dbg("%s - Entry: deregistering slot=%s\n",
104 __func__, slot->name);
105
106 list_del(&slot->rpaphp_slot_list);
107
108 retval = pci_hp_deregister(php_slot);
109 if (retval)
110 err("Problem unregistering a slot %s\n", slot->name);
111
112 dbg("%s - Exit: rc[%d]\n", __func__, retval);
113 return retval;
114}
115EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
116
117int rpaphp_register_slot(struct slot *slot)
118{
119 struct hotplug_slot *php_slot = slot->hotplug_slot;
120 int retval;
121 int slotno;
122
123 dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
124 __func__, slot->dn->full_name, slot->index, slot->name,
125 slot->power_domain, slot->type);
126
127 /* should not try to register the same slot twice */
128 if (is_registered(slot)) {
129 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
130 return -EAGAIN;
131 }
132
133 if (slot->dn->child)
134 slotno = PCI_SLOT(PCI_DN(slot->dn->child)->devfn);
135 else
136 slotno = -1;
137 retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
138 if (retval) {
139 err("pci_hp_register failed with error %d\n", retval);
140 return retval;
141 }
142
143 /* add slot to our internal list */
144 list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
145 info("Slot [%s] registered\n", slot->name);
146 return 0;
147}
148
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(slot->dn);
26 kfree(slot->name);
27 kfree(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(sizeof(struct slot), GFP_KERNEL);
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
48error_slot:
49 kfree(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(&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}
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(child, "ibm,my-drc-index", &my_index);
102 if (my_index == slot->index) {
103 slotno = PCI_SLOT(PCI_DN(child)->devfn);
104 of_node_put(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(&slot->rpaphp_slot_list, &rpaphp_slot_head);
117 info("Slot [%s] registered\n", slot->name);
118 return 0;
119}