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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 struct slot *to_slot(struct hotplug_slot *hotplug_slot)
40{
41 return container_of(hotplug_slot, struct slot, hotplug_slot);
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 = to_slot(hotplug_slot);
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_lock_rescan_remove();
84 pci_bus_add_devices(slot->zdev->bus);
85 pci_unlock_rescan_remove();
86
87 return rc;
88
89out_deconfigure:
90 slot_deconfigure(slot);
91 return rc;
92}
93
94static int disable_slot(struct hotplug_slot *hotplug_slot)
95{
96 struct slot *slot = to_slot(hotplug_slot);
97 struct pci_dev *pdev;
98 int rc;
99
100 if (!zpci_fn_configured(slot->zdev->state))
101 return -EIO;
102
103 pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN);
104 if (pdev) {
105 pci_stop_and_remove_bus_device_locked(pdev);
106 pci_dev_put(pdev);
107 }
108
109 rc = zpci_disable_device(slot->zdev);
110 if (rc)
111 return rc;
112
113 return slot_deconfigure(slot);
114}
115
116static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
117{
118 struct slot *slot = to_slot(hotplug_slot);
119
120 switch (slot->zdev->state) {
121 case ZPCI_FN_STATE_STANDBY:
122 *value = 0;
123 break;
124 default:
125 *value = 1;
126 break;
127 }
128 return 0;
129}
130
131static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
132{
133 /* if the slot exits it always contains a function */
134 *value = 1;
135 return 0;
136}
137
138static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
139 .enable_slot = enable_slot,
140 .disable_slot = disable_slot,
141 .get_power_status = get_power_status,
142 .get_adapter_status = get_adapter_status,
143};
144
145int zpci_init_slot(struct zpci_dev *zdev)
146{
147 char name[SLOT_NAME_SIZE];
148 struct slot *slot;
149 int rc;
150
151 if (!zdev)
152 return 0;
153
154 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
155 if (!slot)
156 goto error;
157
158 slot->zdev = zdev;
159 slot->hotplug_slot.ops = &s390_hotplug_slot_ops;
160
161 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
162 rc = pci_hp_register(&slot->hotplug_slot, zdev->bus,
163 ZPCI_DEVFN, name);
164 if (rc)
165 goto error_reg;
166
167 list_add(&slot->slot_list, &s390_hotplug_slot_list);
168 return 0;
169
170error_reg:
171 kfree(slot);
172error:
173 return -ENOMEM;
174}
175
176void zpci_exit_slot(struct zpci_dev *zdev)
177{
178 struct slot *slot, *next;
179
180 list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list,
181 slot_list) {
182 if (slot->zdev != zdev)
183 continue;
184 list_del(&slot->slot_list);
185 pci_hp_deregister(&slot->hotplug_slot);
186 kfree(slot);
187 }
188}
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 get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
61{
62 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
63 hotplug_slot);
64
65 *value = zpci_is_device_configured(zdev) ? 1 : 0;
66 return 0;
67}
68
69static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
70{
71 /* if the slot exits it always contains a function */
72 *value = 1;
73 return 0;
74}
75
76static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
77 .enable_slot = enable_slot,
78 .disable_slot = disable_slot,
79 .get_power_status = get_power_status,
80 .get_adapter_status = get_adapter_status,
81};
82
83int zpci_init_slot(struct zpci_dev *zdev)
84{
85 char name[SLOT_NAME_SIZE];
86 struct zpci_bus *zbus = zdev->zbus;
87
88 zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
89
90 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
91 return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
92 zdev->devfn, name);
93}
94
95void zpci_exit_slot(struct zpci_dev *zdev)
96{
97 pci_hp_deregister(&zdev->hotplug_slot);
98}