tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/kobject.h>
28#include <linux/sysfs.h>
29#include <linux/pci.h>
30#include <linux/string.h>
31#include <linux/slab.h>
32
33#include <asm/rtas.h>
34#include "rpaphp.h"
35
36static ssize_t address_read_file (struct hotplug_slot *php_slot, char *buf)
37{
38 int retval;
39 struct slot *slot = (struct slot *)php_slot->private;
40 struct pci_bus *bus;
41
42 if (!slot)
43 return -ENOENT;
44
45 bus = slot->bus;
46 if (!bus)
47 return -ENOENT;
48
49 if (bus->self)
50 retval = sprintf(buf, pci_name(bus->self));
51 else
52 retval = sprintf(buf, "%04x:%02x:00.0",
53 pci_domain_nr(bus), bus->number);
54
55 return retval;
56}
57
58static struct hotplug_slot_attribute php_attr_address = {
59 .attr = {.name = "address", .mode = S_IFREG | S_IRUGO},
60 .show = address_read_file,
61};
62
63/* free up the memory used by a slot */
64static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
65{
66 struct slot *slot = (struct slot *) hotplug_slot->private;
67 dealloc_slot_struct(slot);
68}
69
70void dealloc_slot_struct(struct slot *slot)
71{
72 kfree(slot->hotplug_slot->info);
73 kfree(slot->hotplug_slot->name);
74 kfree(slot->hotplug_slot);
75 kfree(slot);
76}
77
78struct slot *alloc_slot_struct(struct device_node *dn,
79 int drc_index, char *drc_name, int power_domain)
80{
81 struct slot *slot;
82
83 slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
84 if (!slot)
85 goto error_nomem;
86 slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
87 if (!slot->hotplug_slot)
88 goto error_slot;
89 slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
90 GFP_KERNEL);
91 if (!slot->hotplug_slot->info)
92 goto error_hpslot;
93 slot->hotplug_slot->name = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
94 if (!slot->hotplug_slot->name)
95 goto error_info;
96 slot->name = slot->hotplug_slot->name;
97 strcpy(slot->name, drc_name);
98 slot->dn = dn;
99 slot->index = drc_index;
100 slot->power_domain = power_domain;
101 slot->hotplug_slot->private = slot;
102 slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
103 slot->hotplug_slot->release = &rpaphp_release_slot;
104
105 return (slot);
106
107error_info:
108 kfree(slot->hotplug_slot->info);
109error_hpslot:
110 kfree(slot->hotplug_slot);
111error_slot:
112 kfree(slot);
113error_nomem:
114 return NULL;
115}
116
117static int is_registered(struct slot *slot)
118{
119 struct slot *tmp_slot;
120
121 list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
122 if (!strcmp(tmp_slot->name, slot->name))
123 return 1;
124 }
125 return 0;
126}
127
128int rpaphp_deregister_slot(struct slot *slot)
129{
130 int retval = 0;
131 struct hotplug_slot *php_slot = slot->hotplug_slot;
132
133 dbg("%s - Entry: deregistering slot=%s\n",
134 __func__, slot->name);
135
136 list_del(&slot->rpaphp_slot_list);
137
138 /* remove "address" file */
139 sysfs_remove_file(&php_slot->kobj, &php_attr_address.attr);
140
141 retval = pci_hp_deregister(php_slot);
142 if (retval)
143 err("Problem unregistering a slot %s\n", slot->name);
144
145 dbg("%s - Exit: rc[%d]\n", __func__, retval);
146 return retval;
147}
148EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
149
150int rpaphp_register_slot(struct slot *slot)
151{
152 struct hotplug_slot *php_slot = slot->hotplug_slot;
153 int retval;
154
155 dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
156 __func__, slot->dn->full_name, slot->index, slot->name,
157 slot->power_domain, slot->type);
158
159 /* should not try to register the same slot twice */
160 if (is_registered(slot)) {
161 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
162 return -EAGAIN;
163 }
164
165 retval = pci_hp_register(php_slot);
166 if (retval) {
167 err("pci_hp_register failed with error %d\n", retval);
168 return retval;
169 }
170
171 /* create "address" file */
172 retval = sysfs_create_file(&php_slot->kobj, &php_attr_address.attr);
173 if (retval) {
174 err("sysfs_create_file failed with error %d\n", retval);
175 goto sysfs_fail;
176 }
177
178 /* add slot to our internal list */
179 list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
180 info("Slot [%s] registered\n", slot->name);
181 return 0;
182
183sysfs_fail:
184 pci_hp_deregister(php_slot);
185 return retval;
186}
187