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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 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 * struct slot - slot information for each *physical* slot
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_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 = hotplug_slot->private;
97 int rc;
98
99 if (!zpci_fn_configured(slot->zdev->state))
100 return -EIO;
101
102 if (slot->zdev->pdev)
103 pci_stop_and_remove_bus_device_locked(slot->zdev->pdev);
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 /* if the slot exits it always contains a function */
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 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}
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 mutex_lock(&zdev->state_lock);
30 if (zdev->state != ZPCI_FN_STATE_STANDBY) {
31 rc = -EIO;
32 goto out;
33 }
34
35 rc = sclp_pci_configure(zdev->fid);
36 zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, rc);
37 if (rc)
38 goto out;
39 zdev->state = ZPCI_FN_STATE_CONFIGURED;
40
41 rc = zpci_scan_configured_device(zdev, zdev->fh);
42out:
43 mutex_unlock(&zdev->state_lock);
44 return rc;
45}
46
47static int disable_slot(struct hotplug_slot *hotplug_slot)
48{
49 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
50 hotplug_slot);
51 struct pci_dev *pdev = NULL;
52 int rc;
53
54 mutex_lock(&zdev->state_lock);
55 if (zdev->state != ZPCI_FN_STATE_CONFIGURED) {
56 rc = -EIO;
57 goto out;
58 }
59
60 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
61 if (pdev && pci_num_vf(pdev)) {
62 pci_dev_put(pdev);
63 rc = -EBUSY;
64 goto out;
65 }
66
67 rc = zpci_deconfigure_device(zdev);
68out:
69 mutex_unlock(&zdev->state_lock);
70 if (pdev)
71 pci_dev_put(pdev);
72 return rc;
73}
74
75static int reset_slot(struct hotplug_slot *hotplug_slot, bool probe)
76{
77 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
78 hotplug_slot);
79 int rc = -EIO;
80
81 /*
82 * If we can't get the zdev->state_lock the device state is
83 * currently undergoing a transition and we bail out - just
84 * the same as if the device's state is not configured at all.
85 */
86 if (!mutex_trylock(&zdev->state_lock))
87 return rc;
88
89 /* We can reset only if the function is configured */
90 if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
91 goto out;
92
93 if (probe) {
94 rc = 0;
95 goto out;
96 }
97
98 rc = zpci_hot_reset_device(zdev);
99out:
100 mutex_unlock(&zdev->state_lock);
101 return rc;
102}
103
104static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
105{
106 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
107 hotplug_slot);
108
109 *value = zpci_is_device_configured(zdev) ? 1 : 0;
110 return 0;
111}
112
113static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
114{
115 /* if the slot exists it always contains a function */
116 *value = 1;
117 return 0;
118}
119
120static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
121 .enable_slot = enable_slot,
122 .disable_slot = disable_slot,
123 .reset_slot = reset_slot,
124 .get_power_status = get_power_status,
125 .get_adapter_status = get_adapter_status,
126};
127
128int zpci_init_slot(struct zpci_dev *zdev)
129{
130 char name[SLOT_NAME_SIZE];
131 struct zpci_bus *zbus = zdev->zbus;
132
133 zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
134
135 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
136 return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
137 zdev->devfn, name);
138}
139
140void zpci_exit_slot(struct zpci_dev *zdev)
141{
142 pci_hp_deregister(&zdev->hotplug_slot);
143}