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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Hot Plug Controller Driver for System z
4 *
5 * Copyright 2012 IBM Corp.
6 *
7 * Author(s):
8 * Jan Glauber <jang@linux.vnet.ibm.com>
9 */
10
11#define KMSG_COMPONENT "zpci"
12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/pci.h>
17#include <linux/pci_hotplug.h>
18#include <asm/pci_debug.h>
19#include <asm/sclp.h>
20
21#define SLOT_NAME_SIZE 10
22static LIST_HEAD(s390_hotplug_slot_list);
23
24static int zpci_fn_configured(enum zpci_state state)
25{
26 return state == ZPCI_FN_STATE_CONFIGURED ||
27 state == ZPCI_FN_STATE_ONLINE;
28}
29
30/*
31 * struct slot - slot information for each *physical* slot
32 */
33struct slot {
34 struct list_head slot_list;
35 struct hotplug_slot *hotplug_slot;
36 struct zpci_dev *zdev;
37};
38
39static inline int slot_configure(struct slot *slot)
40{
41 int ret = sclp_pci_configure(slot->zdev->fid);
42
43 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
44 if (!ret)
45 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
46
47 return ret;
48}
49
50static inline int slot_deconfigure(struct slot *slot)
51{
52 int ret = sclp_pci_deconfigure(slot->zdev->fid);
53
54 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
55 if (!ret)
56 slot->zdev->state = ZPCI_FN_STATE_STANDBY;
57
58 return ret;
59}
60
61static int enable_slot(struct hotplug_slot *hotplug_slot)
62{
63 struct slot *slot = hotplug_slot->private;
64 int rc;
65
66 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
67 return -EIO;
68
69 rc = slot_configure(slot);
70 if (rc)
71 return rc;
72
73 rc = zpci_enable_device(slot->zdev);
74 if (rc)
75 goto out_deconfigure;
76
77 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
78 pci_lock_rescan_remove();
79 pci_bus_add_devices(slot->zdev->bus);
80 pci_unlock_rescan_remove();
81
82 return rc;
83
84out_deconfigure:
85 slot_deconfigure(slot);
86 return rc;
87}
88
89static int disable_slot(struct hotplug_slot *hotplug_slot)
90{
91 struct slot *slot = hotplug_slot->private;
92 struct pci_dev *pdev;
93 int rc;
94
95 if (!zpci_fn_configured(slot->zdev->state))
96 return -EIO;
97
98 pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN);
99 if (pdev) {
100 pci_stop_and_remove_bus_device_locked(pdev);
101 pci_dev_put(pdev);
102 }
103
104 rc = zpci_disable_device(slot->zdev);
105 if (rc)
106 return rc;
107
108 return slot_deconfigure(slot);
109}
110
111static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
112{
113 struct slot *slot = hotplug_slot->private;
114
115 switch (slot->zdev->state) {
116 case ZPCI_FN_STATE_STANDBY:
117 *value = 0;
118 break;
119 default:
120 *value = 1;
121 break;
122 }
123 return 0;
124}
125
126static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
127{
128 /* if the slot exits it always contains a function */
129 *value = 1;
130 return 0;
131}
132
133static void release_slot(struct hotplug_slot *hotplug_slot)
134{
135 struct slot *slot = hotplug_slot->private;
136
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 goto error_reg;
188
189 list_add(&slot->slot_list, &s390_hotplug_slot_list);
190 return 0;
191
192error_reg:
193 kfree(info);
194error_info:
195 kfree(hotplug_slot);
196error_hp:
197 kfree(slot);
198error:
199 return -ENOMEM;
200}
201
202void zpci_exit_slot(struct zpci_dev *zdev)
203{
204 struct slot *slot, *next;
205
206 list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list,
207 slot_list) {
208 if (slot->zdev != zdev)
209 continue;
210 list_del(&slot->slot_list);
211 pci_hp_deregister(slot->hotplug_slot);
212 }
213}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Hot Plug Controller Driver for System z
4 *
5 * Copyright 2012 IBM Corp.
6 *
7 * Author(s):
8 * Jan Glauber <jang@linux.vnet.ibm.com>
9 */
10
11#define KMSG_COMPONENT "zpci"
12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/pci.h>
17#include <linux/pci_hotplug.h>
18#include <asm/pci_debug.h>
19#include <asm/sclp.h>
20
21#define SLOT_NAME_SIZE 10
22
23static int enable_slot(struct hotplug_slot *hotplug_slot)
24{
25 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
26 hotplug_slot);
27 int rc;
28
29 if (zdev->state != ZPCI_FN_STATE_STANDBY)
30 return -EIO;
31
32 rc = sclp_pci_configure(zdev->fid);
33 zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, rc);
34 if (rc)
35 return rc;
36 zdev->state = ZPCI_FN_STATE_CONFIGURED;
37
38 return zpci_scan_configured_device(zdev, zdev->fh);
39}
40
41static int disable_slot(struct hotplug_slot *hotplug_slot)
42{
43 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
44 hotplug_slot);
45 struct pci_dev *pdev;
46
47 if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
48 return -EIO;
49
50 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
51 if (pdev && pci_num_vf(pdev)) {
52 pci_dev_put(pdev);
53 return -EBUSY;
54 }
55 pci_dev_put(pdev);
56
57 return zpci_deconfigure_device(zdev);
58}
59
60static int reset_slot(struct hotplug_slot *hotplug_slot, bool probe)
61{
62 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
63 hotplug_slot);
64
65 if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
66 return -EIO;
67 /*
68 * We can't take the zdev->lock as reset_slot may be called during
69 * probing and/or device removal which already happens under the
70 * zdev->lock. Instead the user should use the higher level
71 * pci_reset_function() or pci_bus_reset() which hold the PCI device
72 * lock preventing concurrent removal. If not using these functions
73 * holding the PCI device lock is required.
74 */
75
76 /* As long as the function is configured we can reset */
77 if (probe)
78 return 0;
79
80 return zpci_hot_reset_device(zdev);
81}
82
83static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
84{
85 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
86 hotplug_slot);
87
88 *value = zpci_is_device_configured(zdev) ? 1 : 0;
89 return 0;
90}
91
92static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
93{
94 /* if the slot exits it always contains a function */
95 *value = 1;
96 return 0;
97}
98
99static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
100 .enable_slot = enable_slot,
101 .disable_slot = disable_slot,
102 .reset_slot = reset_slot,
103 .get_power_status = get_power_status,
104 .get_adapter_status = get_adapter_status,
105};
106
107int zpci_init_slot(struct zpci_dev *zdev)
108{
109 char name[SLOT_NAME_SIZE];
110 struct zpci_bus *zbus = zdev->zbus;
111
112 zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
113
114 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
115 return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
116 zdev->devfn, name);
117}
118
119void zpci_exit_slot(struct zpci_dev *zdev)
120{
121 pci_hp_deregister(&zdev->hotplug_slot);
122}