1 // SPDX-License-Identifier: GPL-2.0+
3 * PCI Hot Plug Controller Driver for System z
5 * Copyright 2012 IBM Corp.
8 * Jan Glauber <jang@linux.vnet.ibm.com>
11 #define KMSG_COMPONENT "zpci"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
21 #define SLOT_NAME_SIZE 10
22 static LIST_HEAD(s390_hotplug_slot_list);
24 static int zpci_fn_configured(enum zpci_state state)
26 return state == ZPCI_FN_STATE_CONFIGURED ||
27 state == ZPCI_FN_STATE_ONLINE;
31 * struct slot - slot information for each *physical* slot
34 struct list_head slot_list;
35 struct hotplug_slot *hotplug_slot;
36 struct zpci_dev *zdev;
39 static inline int slot_configure(struct slot *slot)
41 int ret = sclp_pci_configure(slot->zdev->fid);
43 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
45 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
50 static inline int slot_deconfigure(struct slot *slot)
52 int ret = sclp_pci_deconfigure(slot->zdev->fid);
54 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
56 slot->zdev->state = ZPCI_FN_STATE_STANDBY;
61 static int enable_slot(struct hotplug_slot *hotplug_slot)
63 struct slot *slot = hotplug_slot->private;
66 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
69 rc = slot_configure(slot);
73 rc = zpci_enable_device(slot->zdev);
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();
85 slot_deconfigure(slot);
89 static int disable_slot(struct hotplug_slot *hotplug_slot)
91 struct slot *slot = hotplug_slot->private;
95 if (!zpci_fn_configured(slot->zdev->state))
98 pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN);
100 pci_stop_and_remove_bus_device_locked(pdev);
104 rc = zpci_disable_device(slot->zdev);
108 return slot_deconfigure(slot);
111 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
113 struct slot *slot = hotplug_slot->private;
115 switch (slot->zdev->state) {
116 case ZPCI_FN_STATE_STANDBY:
126 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
128 /* if the slot exits it always contains a function */
133 static struct hotplug_slot_ops s390_hotplug_slot_ops = {
134 .enable_slot = enable_slot,
135 .disable_slot = disable_slot,
136 .get_power_status = get_power_status,
137 .get_adapter_status = get_adapter_status,
140 int zpci_init_slot(struct zpci_dev *zdev)
142 struct hotplug_slot *hotplug_slot;
143 struct hotplug_slot_info *info;
144 char name[SLOT_NAME_SIZE];
151 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
155 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
158 hotplug_slot->private = slot;
160 slot->hotplug_slot = hotplug_slot;
163 info = kzalloc(sizeof(*info), GFP_KERNEL);
166 hotplug_slot->info = info;
168 hotplug_slot->ops = &s390_hotplug_slot_ops;
170 get_power_status(hotplug_slot, &info->power_status);
171 get_adapter_status(hotplug_slot, &info->adapter_status);
173 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
174 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
179 list_add(&slot->slot_list, &s390_hotplug_slot_list);
192 void zpci_exit_slot(struct zpci_dev *zdev)
194 struct slot *slot, *next;
196 list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list,
198 if (slot->zdev != zdev)
200 list_del(&slot->slot_list);
201 pci_hp_deregister(slot->hotplug_slot);
202 kfree(slot->hotplug_slot->info);
203 kfree(slot->hotplug_slot);