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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// 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 zpci_fn_configured(enum zpci_state state)
24{
25 return state == ZPCI_FN_STATE_CONFIGURED ||
26 state == ZPCI_FN_STATE_ONLINE;
27}
28
29static inline int zdev_configure(struct zpci_dev *zdev)
30{
31 int ret = sclp_pci_configure(zdev->fid);
32
33 zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, ret);
34 if (!ret)
35 zdev->state = ZPCI_FN_STATE_CONFIGURED;
36
37 return ret;
38}
39
40static inline int zdev_deconfigure(struct zpci_dev *zdev)
41{
42 int ret = sclp_pci_deconfigure(zdev->fid);
43
44 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
45 if (!ret)
46 zdev->state = ZPCI_FN_STATE_STANDBY;
47
48 return ret;
49}
50
51static int enable_slot(struct hotplug_slot *hotplug_slot)
52{
53 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
54 hotplug_slot);
55 struct zpci_bus *zbus = zdev->zbus;
56 int rc;
57
58 if (zdev->state != ZPCI_FN_STATE_STANDBY)
59 return -EIO;
60
61 rc = zdev_configure(zdev);
62 if (rc)
63 return rc;
64
65 rc = zpci_enable_device(zdev);
66 if (rc)
67 goto out_deconfigure;
68
69 pci_scan_slot(zbus->bus, zdev->devfn);
70 pci_lock_rescan_remove();
71 pci_bus_add_devices(zbus->bus);
72 pci_unlock_rescan_remove();
73
74 return rc;
75
76out_deconfigure:
77 zdev_deconfigure(zdev);
78 return rc;
79}
80
81static int disable_slot(struct hotplug_slot *hotplug_slot)
82{
83 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
84 hotplug_slot);
85 struct pci_dev *pdev;
86 int rc;
87
88 if (!zpci_fn_configured(zdev->state))
89 return -EIO;
90
91 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
92 if (pdev && pci_num_vf(pdev)) {
93 pci_dev_put(pdev);
94 return -EBUSY;
95 }
96
97 zpci_remove_device(zdev);
98
99 rc = zpci_disable_device(zdev);
100 if (rc)
101 return rc;
102
103 return zdev_deconfigure(zdev);
104}
105
106static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
107{
108 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
109 hotplug_slot);
110
111 switch (zdev->state) {
112 case ZPCI_FN_STATE_STANDBY:
113 *value = 0;
114 break;
115 default:
116 *value = 1;
117 break;
118 }
119 return 0;
120}
121
122static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
123{
124 /* if the slot exits it always contains a function */
125 *value = 1;
126 return 0;
127}
128
129static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
130 .enable_slot = enable_slot,
131 .disable_slot = disable_slot,
132 .get_power_status = get_power_status,
133 .get_adapter_status = get_adapter_status,
134};
135
136int zpci_init_slot(struct zpci_dev *zdev)
137{
138 char name[SLOT_NAME_SIZE];
139 struct zpci_bus *zbus = zdev->zbus;
140
141 zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
142
143 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
144 return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
145 zdev->devfn, name);
146}
147
148void zpci_exit_slot(struct zpci_dev *zdev)
149{
150 pci_hp_deregister(&zdev->hotplug_slot);
151}