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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
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}
1/*
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 KMSG_COMPONENT "zpci"
11#define pr_fmt(fmt) KMSG_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 <asm/pci_debug.h>
19#include <asm/sclp.h>
20
21#define SLOT_NAME_SIZE 10
22static LIST_HEAD(s390_hotplug_slot_list);
23
24MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com");
25MODULE_DESCRIPTION("Hot Plug PCI Controller for System z");
26MODULE_LICENSE("GPL");
27
28static int zpci_fn_configured(enum zpci_state state)
29{
30 return state == ZPCI_FN_STATE_CONFIGURED ||
31 state == ZPCI_FN_STATE_ONLINE;
32}
33
34/*
35 * struct slot - slot information for each *physical* slot
36 */
37struct slot {
38 struct list_head slot_list;
39 struct hotplug_slot *hotplug_slot;
40 struct zpci_dev *zdev;
41};
42
43static inline int slot_configure(struct slot *slot)
44{
45 int ret = sclp_pci_configure(slot->zdev->fid);
46
47 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
48 if (!ret)
49 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
50
51 return ret;
52}
53
54static inline int slot_deconfigure(struct slot *slot)
55{
56 int ret = sclp_pci_deconfigure(slot->zdev->fid);
57
58 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
59 if (!ret)
60 slot->zdev->state = ZPCI_FN_STATE_STANDBY;
61
62 return ret;
63}
64
65static int enable_slot(struct hotplug_slot *hotplug_slot)
66{
67 struct slot *slot = hotplug_slot->private;
68 int rc;
69
70 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
71 return -EIO;
72
73 rc = slot_configure(slot);
74 if (rc)
75 return rc;
76
77 rc = zpci_enable_device(slot->zdev);
78 if (rc)
79 goto out_deconfigure;
80
81 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
82 pci_lock_rescan_remove();
83 pci_bus_add_devices(slot->zdev->bus);
84 pci_unlock_rescan_remove();
85
86 return rc;
87
88out_deconfigure:
89 slot_deconfigure(slot);
90 return rc;
91}
92
93static int disable_slot(struct hotplug_slot *hotplug_slot)
94{
95 struct slot *slot = hotplug_slot->private;
96 struct pci_dev *pdev;
97 int rc;
98
99 if (!zpci_fn_configured(slot->zdev->state))
100 return -EIO;
101
102 pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN);
103 if (pdev) {
104 pci_stop_and_remove_bus_device_locked(pdev);
105 pci_dev_put(pdev);
106 }
107
108 rc = zpci_disable_device(slot->zdev);
109 if (rc)
110 return rc;
111
112 return slot_deconfigure(slot);
113}
114
115static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
116{
117 struct slot *slot = hotplug_slot->private;
118
119 switch (slot->zdev->state) {
120 case ZPCI_FN_STATE_STANDBY:
121 *value = 0;
122 break;
123 default:
124 *value = 1;
125 break;
126 }
127 return 0;
128}
129
130static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
131{
132 /* if the slot exits it always contains a function */
133 *value = 1;
134 return 0;
135}
136
137static void release_slot(struct hotplug_slot *hotplug_slot)
138{
139 struct slot *slot = hotplug_slot->private;
140
141 kfree(slot->hotplug_slot->info);
142 kfree(slot->hotplug_slot);
143 kfree(slot);
144}
145
146static struct hotplug_slot_ops s390_hotplug_slot_ops = {
147 .enable_slot = enable_slot,
148 .disable_slot = disable_slot,
149 .get_power_status = get_power_status,
150 .get_adapter_status = get_adapter_status,
151};
152
153int zpci_init_slot(struct zpci_dev *zdev)
154{
155 struct hotplug_slot *hotplug_slot;
156 struct hotplug_slot_info *info;
157 char name[SLOT_NAME_SIZE];
158 struct slot *slot;
159 int rc;
160
161 if (!zdev)
162 return 0;
163
164 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
165 if (!slot)
166 goto error;
167
168 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
169 if (!hotplug_slot)
170 goto error_hp;
171 hotplug_slot->private = slot;
172
173 slot->hotplug_slot = hotplug_slot;
174 slot->zdev = zdev;
175
176 info = kzalloc(sizeof(*info), GFP_KERNEL);
177 if (!info)
178 goto error_info;
179 hotplug_slot->info = info;
180
181 hotplug_slot->ops = &s390_hotplug_slot_ops;
182 hotplug_slot->release = &release_slot;
183
184 get_power_status(hotplug_slot, &info->power_status);
185 get_adapter_status(hotplug_slot, &info->adapter_status);
186
187 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
188 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
189 ZPCI_DEVFN, name);
190 if (rc)
191 goto error_reg;
192
193 list_add(&slot->slot_list, &s390_hotplug_slot_list);
194 return 0;
195
196error_reg:
197 kfree(info);
198error_info:
199 kfree(hotplug_slot);
200error_hp:
201 kfree(slot);
202error:
203 return -ENOMEM;
204}
205
206void zpci_exit_slot(struct zpci_dev *zdev)
207{
208 struct slot *slot, *next;
209
210 list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list,
211 slot_list) {
212 if (slot->zdev != zdev)
213 continue;
214 list_del(&slot->slot_list);
215 pci_hp_deregister(slot->hotplug_slot);
216 }
217}