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12#define KMSG_COMPONENT "zpci"
13#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15#include <linux/kernel.h>
16#include <linux/slab.h>
17#include <linux/pci.h>
18#include <linux/pci_hotplug.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
25static int zpci_fn_configured(enum zpci_state state)
26{
27 return state == ZPCI_FN_STATE_CONFIGURED ||
28 state == ZPCI_FN_STATE_ONLINE;
29}
30
31
32
33
34struct slot {
35 struct list_head slot_list;
36 struct hotplug_slot *hotplug_slot;
37 struct zpci_dev *zdev;
38};
39
40static inline int slot_configure(struct slot *slot)
41{
42 int ret = sclp_pci_configure(slot->zdev->fid);
43
44 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
45 if (!ret)
46 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
47
48 return ret;
49}
50
51static inline int slot_deconfigure(struct slot *slot)
52{
53 int ret = sclp_pci_deconfigure(slot->zdev->fid);
54
55 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
56 if (!ret)
57 slot->zdev->state = ZPCI_FN_STATE_STANDBY;
58
59 return ret;
60}
61
62static int enable_slot(struct hotplug_slot *hotplug_slot)
63{
64 struct slot *slot = hotplug_slot->private;
65 int rc;
66
67 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
68 return -EIO;
69
70 rc = slot_configure(slot);
71 if (rc)
72 return rc;
73
74 rc = zpci_enable_device(slot->zdev);
75 if (rc)
76 goto out_deconfigure;
77
78 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
79 pci_lock_rescan_remove();
80 pci_bus_add_devices(slot->zdev->bus);
81 pci_unlock_rescan_remove();
82
83 return rc;
84
85out_deconfigure:
86 slot_deconfigure(slot);
87 return rc;
88}
89
90static int disable_slot(struct hotplug_slot *hotplug_slot)
91{
92 struct slot *slot = hotplug_slot->private;
93 struct pci_dev *pdev;
94 int rc;
95
96 if (!zpci_fn_configured(slot->zdev->state))
97 return -EIO;
98
99 pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN);
100 if (pdev) {
101 pci_stop_and_remove_bus_device_locked(pdev);
102 pci_dev_put(pdev);
103 }
104
105 rc = zpci_disable_device(slot->zdev);
106 if (rc)
107 return rc;
108
109 return slot_deconfigure(slot);
110}
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
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 kfree(slot->hotplug_slot->info);
139 kfree(slot->hotplug_slot);
140 kfree(slot);
141}
142
143static struct hotplug_slot_ops s390_hotplug_slot_ops = {
144 .enable_slot = enable_slot,
145 .disable_slot = disable_slot,
146 .get_power_status = get_power_status,
147 .get_adapter_status = get_adapter_status,
148};
149
150int zpci_init_slot(struct zpci_dev *zdev)
151{
152 struct hotplug_slot *hotplug_slot;
153 struct hotplug_slot_info *info;
154 char name[SLOT_NAME_SIZE];
155 struct slot *slot;
156 int rc;
157
158 if (!zdev)
159 return 0;
160
161 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
162 if (!slot)
163 goto error;
164
165 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
166 if (!hotplug_slot)
167 goto error_hp;
168 hotplug_slot->private = slot;
169
170 slot->hotplug_slot = hotplug_slot;
171 slot->zdev = zdev;
172
173 info = kzalloc(sizeof(*info), GFP_KERNEL);
174 if (!info)
175 goto error_info;
176 hotplug_slot->info = info;
177
178 hotplug_slot->ops = &s390_hotplug_slot_ops;
179 hotplug_slot->release = &release_slot;
180
181 get_power_status(hotplug_slot, &info->power_status);
182 get_adapter_status(hotplug_slot, &info->adapter_status);
183
184 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
185 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
186 ZPCI_DEVFN, name);
187 if (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 slot *slot, *next;
206
207 list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list,
208 slot_list) {
209 if (slot->zdev != zdev)
210 continue;
211 list_del(&slot->slot_list);
212 pci_hp_deregister(slot->hotplug_slot);
213 }
214}
215
