2 * PCI Hot Plug Controller Driver for System z
4 * Copyright 2012 IBM Corp.
7 * Jan Glauber <jang@linux.vnet.ibm.com>
10 #define COMPONENT "zPCI hpc"
11 #define pr_fmt(fmt) COMPONENT ": " fmt
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>
22 #define SLOT_NAME_SIZE 10
23 static LIST_HEAD(s390_hotplug_slot_list);
25 MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com");
26 MODULE_DESCRIPTION("Hot Plug PCI Controller for System z");
27 MODULE_LICENSE("GPL");
29 static int zpci_fn_configured(enum zpci_state state)
31 return state == ZPCI_FN_STATE_CONFIGURED ||
32 state == ZPCI_FN_STATE_ONLINE;
36 * struct slot - slot information for each *physical* slot
39 struct list_head slot_list;
40 struct hotplug_slot *hotplug_slot;
41 struct zpci_dev *zdev;
44 static inline int slot_configure(struct slot *slot)
46 int ret = sclp_pci_configure(slot->zdev->fid);
48 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
50 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
55 static inline int slot_deconfigure(struct slot *slot)
57 int ret = sclp_pci_deconfigure(slot->zdev->fid);
59 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
61 slot->zdev->state = ZPCI_FN_STATE_STANDBY;
66 static int enable_slot(struct hotplug_slot *hotplug_slot)
68 struct slot *slot = hotplug_slot->private;
71 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
74 rc = slot_configure(slot);
78 rc = zpci_enable_device(slot->zdev);
82 slot->zdev->state = ZPCI_FN_STATE_ONLINE;
84 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
85 pci_bus_add_devices(slot->zdev->bus);
90 slot_deconfigure(slot);
94 static int disable_slot(struct hotplug_slot *hotplug_slot)
96 struct slot *slot = hotplug_slot->private;
99 if (!zpci_fn_configured(slot->zdev->state))
102 if (slot->zdev->pdev)
103 pci_stop_and_remove_bus_device(slot->zdev->pdev);
105 rc = zpci_disable_device(slot->zdev);
109 return slot_deconfigure(slot);
112 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
114 struct slot *slot = hotplug_slot->private;
116 switch (slot->zdev->state) {
117 case ZPCI_FN_STATE_STANDBY:
127 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
129 /* if the slot exits it always contains a function */
134 static void release_slot(struct hotplug_slot *hotplug_slot)
136 struct slot *slot = hotplug_slot->private;
138 pr_debug("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
139 kfree(slot->hotplug_slot->info);
140 kfree(slot->hotplug_slot);
144 static struct hotplug_slot_ops s390_hotplug_slot_ops = {
145 .enable_slot = enable_slot,
146 .disable_slot = disable_slot,
147 .get_power_status = get_power_status,
148 .get_adapter_status = get_adapter_status,
151 static int init_pci_slot(struct zpci_dev *zdev)
153 struct hotplug_slot *hotplug_slot;
154 struct hotplug_slot_info *info;
155 char name[SLOT_NAME_SIZE];
162 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
166 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
169 hotplug_slot->private = slot;
171 slot->hotplug_slot = hotplug_slot;
174 info = kzalloc(sizeof(*info), GFP_KERNEL);
177 hotplug_slot->info = info;
179 hotplug_slot->ops = &s390_hotplug_slot_ops;
180 hotplug_slot->release = &release_slot;
182 get_power_status(hotplug_slot, &info->power_status);
183 get_adapter_status(hotplug_slot, &info->adapter_status);
185 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
186 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
189 pr_err("pci_hp_register failed with error %d\n", rc);
192 list_add(&slot->slot_list, &s390_hotplug_slot_list);
205 static void exit_pci_slot(struct zpci_dev *zdev)
207 struct list_head *tmp, *n;
210 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
211 slot = list_entry(tmp, struct slot, slot_list);
212 if (slot->zdev != zdev)
214 list_del(&slot->slot_list);
215 pci_hp_deregister(slot->hotplug_slot);
219 static struct pci_hp_callback_ops hp_ops = {
220 .create_slot = init_pci_slot,
221 .remove_slot = exit_pci_slot,
224 static void __init init_pci_slots(void)
226 struct zpci_dev *zdev;
229 * Create a structure for each slot, and register that slot
230 * with the pci_hotplug subsystem.
232 mutex_lock(&zpci_list_lock);
233 list_for_each_entry(zdev, &zpci_list, entry) {
236 mutex_unlock(&zpci_list_lock);
239 static void __exit exit_pci_slots(void)
241 struct list_head *tmp, *n;
245 * Unregister all of our slots with the pci_hotplug subsystem.
246 * Memory will be freed in release_slot() callback after slot's
247 * lifespan is finished.
249 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
250 slot = list_entry(tmp, struct slot, slot_list);
251 list_del(&slot->slot_list);
252 pci_hp_deregister(slot->hotplug_slot);
256 static int __init pci_hotplug_s390_init(void)
261 zpci_register_hp_ops(&hp_ops);
267 static void __exit pci_hotplug_s390_exit(void)
270 zpci_deregister_hp_ops();
273 module_init(pci_hotplug_s390_init);
274 module_exit(pci_hotplug_s390_exit);