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Jan Glauber7441b062012-11-29 14:35:47 +01001/*
2 * PCI Hot Plug Controller Driver for System z
3 *
4 * Copyright 2012 IBM Corp.
5 *
6 * Author(s):
7 * Jan Glauber <jang@linux.vnet.ibm.com>
8 */
9
10#define COMPONENT "zPCI hpc"
11#define pr_fmt(fmt) COMPONENT ": " fmt
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/pci.h>
17#include <linux/pci_hotplug.h>
18#include <linux/init.h>
Sebastian Otta2ab8332013-04-16 14:11:14 +020019#include <asm/pci_debug.h>
Jan Glauber7441b062012-11-29 14:35:47 +010020#include <asm/sclp.h>
21
22#define SLOT_NAME_SIZE 10
23static LIST_HEAD(s390_hotplug_slot_list);
24
25MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com");
26MODULE_DESCRIPTION("Hot Plug PCI Controller for System z");
27MODULE_LICENSE("GPL");
28
29static int zpci_fn_configured(enum zpci_state state)
30{
31 return state == ZPCI_FN_STATE_CONFIGURED ||
32 state == ZPCI_FN_STATE_ONLINE;
33}
34
35/*
36 * struct slot - slot information for each *physical* slot
37 */
38struct slot {
39 struct list_head slot_list;
40 struct hotplug_slot *hotplug_slot;
41 struct zpci_dev *zdev;
42};
43
Sebastian Ott4bee2a52013-06-05 16:06:42 +020044static inline int slot_configure(struct slot *slot)
45{
46 int ret = sclp_pci_configure(slot->zdev->fid);
47
48 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
49 if (!ret)
50 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
51
52 return ret;
53}
54
55static inline int slot_deconfigure(struct slot *slot)
56{
57 int ret = sclp_pci_deconfigure(slot->zdev->fid);
58
59 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
60 if (!ret)
61 slot->zdev->state = ZPCI_FN_STATE_STANDBY;
62
63 return ret;
64}
65
Jan Glauber7441b062012-11-29 14:35:47 +010066static int enable_slot(struct hotplug_slot *hotplug_slot)
67{
68 struct slot *slot = hotplug_slot->private;
69 int rc;
70
71 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
72 return -EIO;
73
Sebastian Ott4bee2a52013-06-05 16:06:42 +020074 rc = slot_configure(slot);
75 if (rc)
76 return rc;
77
78 rc = zpci_enable_device(slot->zdev);
79 if (rc)
80 goto out_deconfigure;
81
82 slot->zdev->state = ZPCI_FN_STATE_ONLINE;
83
84 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
85 pci_bus_add_devices(slot->zdev->bus);
86
87 return rc;
88
89out_deconfigure:
90 slot_deconfigure(slot);
Jan Glauber7441b062012-11-29 14:35:47 +010091 return rc;
92}
93
94static int disable_slot(struct hotplug_slot *hotplug_slot)
95{
96 struct slot *slot = hotplug_slot->private;
97 int rc;
98
99 if (!zpci_fn_configured(slot->zdev->state))
100 return -EIO;
101
Sebastian Ott8b2a7e62013-06-05 16:07:28 +0200102 if (slot->zdev->pdev)
103 pci_stop_and_remove_bus_device(slot->zdev->pdev);
104
Sebastian Ottcb65a662013-04-16 14:12:17 +0200105 rc = zpci_disable_device(slot->zdev);
106 if (rc)
107 return rc;
Sebastian Ott8b2a7e62013-06-05 16:07:28 +0200108
Sebastian Ott4bee2a52013-06-05 16:06:42 +0200109 return slot_deconfigure(slot);
Jan Glauber7441b062012-11-29 14:35:47 +0100110}
111
112static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
113{
114 struct slot *slot = hotplug_slot->private;
115
116 switch (slot->zdev->state) {
117 case ZPCI_FN_STATE_STANDBY:
118 *value = 0;
119 break;
120 default:
121 *value = 1;
122 break;
123 }
124 return 0;
125}
126
127static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
128{
129 /* if the slot exits it always contains a function */
130 *value = 1;
131 return 0;
132}
133
134static void release_slot(struct hotplug_slot *hotplug_slot)
135{
136 struct slot *slot = hotplug_slot->private;
137
138 pr_debug("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
139 kfree(slot->hotplug_slot->info);
140 kfree(slot->hotplug_slot);
141 kfree(slot);
142}
143
144static struct hotplug_slot_ops s390_hotplug_slot_ops = {
145 .enable_slot = enable_slot,
146 .disable_slot = disable_slot,
147 .get_power_status = get_power_status,
148 .get_adapter_status = get_adapter_status,
149};
150
151static int init_pci_slot(struct zpci_dev *zdev)
152{
153 struct hotplug_slot *hotplug_slot;
154 struct hotplug_slot_info *info;
155 char name[SLOT_NAME_SIZE];
156 struct slot *slot;
157 int rc;
158
159 if (!zdev)
160 return 0;
161
162 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
163 if (!slot)
164 goto error;
165
166 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
167 if (!hotplug_slot)
168 goto error_hp;
169 hotplug_slot->private = slot;
170
171 slot->hotplug_slot = hotplug_slot;
172 slot->zdev = zdev;
173
174 info = kzalloc(sizeof(*info), GFP_KERNEL);
175 if (!info)
176 goto error_info;
177 hotplug_slot->info = info;
178
179 hotplug_slot->ops = &s390_hotplug_slot_ops;
180 hotplug_slot->release = &release_slot;
181
182 get_power_status(hotplug_slot, &info->power_status);
183 get_adapter_status(hotplug_slot, &info->adapter_status);
184
185 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
186 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
187 ZPCI_DEVFN, name);
188 if (rc) {
189 pr_err("pci_hp_register failed with error %d\n", rc);
190 goto error_reg;
191 }
192 list_add(&slot->slot_list, &s390_hotplug_slot_list);
193 return 0;
194
195error_reg:
196 kfree(info);
197error_info:
198 kfree(hotplug_slot);
199error_hp:
200 kfree(slot);
201error:
202 return -ENOMEM;
203}
204
Jan Glauber7441b062012-11-29 14:35:47 +0100205static void exit_pci_slot(struct zpci_dev *zdev)
206{
207 struct list_head *tmp, *n;
208 struct slot *slot;
209
210 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
211 slot = list_entry(tmp, struct slot, slot_list);
212 if (slot->zdev != zdev)
213 continue;
214 list_del(&slot->slot_list);
215 pci_hp_deregister(slot->hotplug_slot);
216 }
217}
218
Sebastian Ott53923352013-01-31 19:55:17 +0100219static struct pci_hp_callback_ops hp_ops = {
220 .create_slot = init_pci_slot,
221 .remove_slot = exit_pci_slot,
222};
223
224static void __init init_pci_slots(void)
225{
226 struct zpci_dev *zdev;
227
228 /*
229 * Create a structure for each slot, and register that slot
230 * with the pci_hotplug subsystem.
231 */
232 mutex_lock(&zpci_list_lock);
233 list_for_each_entry(zdev, &zpci_list, entry) {
234 init_pci_slot(zdev);
235 }
236 mutex_unlock(&zpci_list_lock);
237}
238
Jan Glauber7441b062012-11-29 14:35:47 +0100239static void __exit exit_pci_slots(void)
240{
241 struct list_head *tmp, *n;
242 struct slot *slot;
243
244 /*
245 * Unregister all of our slots with the pci_hotplug subsystem.
246 * Memory will be freed in release_slot() callback after slot's
247 * lifespan is finished.
248 */
249 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
250 slot = list_entry(tmp, struct slot, slot_list);
251 list_del(&slot->slot_list);
252 pci_hp_deregister(slot->hotplug_slot);
253 }
254}
255
256static int __init pci_hotplug_s390_init(void)
257{
Heiko Carstens1e5635d2013-01-30 15:52:16 +0100258 if (!s390_pci_probe)
Jan Glauber7441b062012-11-29 14:35:47 +0100259 return -EOPNOTSUPP;
260
Sebastian Ott53923352013-01-31 19:55:17 +0100261 zpci_register_hp_ops(&hp_ops);
262 init_pci_slots();
263
264 return 0;
Jan Glauber7441b062012-11-29 14:35:47 +0100265}
266
267static void __exit pci_hotplug_s390_exit(void)
268{
269 exit_pci_slots();
Sebastian Ott53923352013-01-31 19:55:17 +0100270 zpci_deregister_hp_ops();
Jan Glauber7441b062012-11-29 14:35:47 +0100271}
272
273module_init(pci_hotplug_s390_init);
274module_exit(pci_hotplug_s390_exit);