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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>
19#include <asm/pci_debug.h>
20#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
37
38struct slot {
39 struct list_head slot_list;
40 struct hotplug_slot *hotplug_slot;
41 struct zpci_dev *zdev;
42};
43
44static 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
66static 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
74 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 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
83 pci_bus_add_devices(slot->zdev->bus);
84
85 return rc;
86
87out_deconfigure:
88 slot_deconfigure(slot);
89 return rc;
90}
91
92static int disable_slot(struct hotplug_slot *hotplug_slot)
93{
94 struct slot *slot = hotplug_slot->private;
95 int rc;
96
97 if (!zpci_fn_configured(slot->zdev->state))
98 return -EIO;
99
100 if (slot->zdev->pdev)
101 pci_stop_and_remove_bus_device(slot->zdev->pdev);
102
103 rc = zpci_disable_device(slot->zdev);
104 if (rc)
105 return rc;
106
107 return slot_deconfigure(slot);
108}
109
110static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
111{
112 struct slot *slot = hotplug_slot->private;
113
114 switch (slot->zdev->state) {
115 case ZPCI_FN_STATE_STANDBY:
116 *value = 0;
117 break;
118 default:
119 *value = 1;
120 break;
121 }
122 return 0;
123}
124
125static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
126{
127
128 *value = 1;
129 return 0;
130}
131
132static void release_slot(struct hotplug_slot *hotplug_slot)
133{
134 struct slot *slot = hotplug_slot->private;
135
136 pr_debug("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
137 kfree(slot->hotplug_slot->info);
138 kfree(slot->hotplug_slot);
139 kfree(slot);
140}
141
142static struct hotplug_slot_ops s390_hotplug_slot_ops = {
143 .enable_slot = enable_slot,
144 .disable_slot = disable_slot,
145 .get_power_status = get_power_status,
146 .get_adapter_status = get_adapter_status,
147};
148
149int zpci_init_slot(struct zpci_dev *zdev)
150{
151 struct hotplug_slot *hotplug_slot;
152 struct hotplug_slot_info *info;
153 char name[SLOT_NAME_SIZE];
154 struct slot *slot;
155 int rc;
156
157 if (!zdev)
158 return 0;
159
160 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
161 if (!slot)
162 goto error;
163
164 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
165 if (!hotplug_slot)
166 goto error_hp;
167 hotplug_slot->private = slot;
168
169 slot->hotplug_slot = hotplug_slot;
170 slot->zdev = zdev;
171
172 info = kzalloc(sizeof(*info), GFP_KERNEL);
173 if (!info)
174 goto error_info;
175 hotplug_slot->info = info;
176
177 hotplug_slot->ops = &s390_hotplug_slot_ops;
178 hotplug_slot->release = &release_slot;
179
180 get_power_status(hotplug_slot, &info->power_status);
181 get_adapter_status(hotplug_slot, &info->adapter_status);
182
183 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
184 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
185 ZPCI_DEVFN, name);
186 if (rc) {
187 pr_err("pci_hp_register failed with error %d\n", rc);
188 goto error_reg;
189 }
190 list_add(&slot->slot_list, &s390_hotplug_slot_list);
191 return 0;
192
193error_reg:
194 kfree(info);
195error_info:
196 kfree(hotplug_slot);
197error_hp:
198 kfree(slot);
199error:
200 return -ENOMEM;
201}
202
203void zpci_exit_slot(struct zpci_dev *zdev)
204{
205 struct list_head *tmp, *n;
206 struct slot *slot;
207
208 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
209 slot = list_entry(tmp, struct slot, slot_list);
210 if (slot->zdev != zdev)
211 continue;
212 list_del(&slot->slot_list);
213 pci_hp_deregister(slot->hotplug_slot);
214 }
215}
216
