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 rc = zpci_disable_device(slot->zdev);
105 /* TODO: we rely on the user to unbind/remove the device, is that plausible
106 * or do we need to trigger that here?
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 void release_slot(struct hotplug_slot *hotplug_slot)
135 struct slot *slot = hotplug_slot->private;
137 pr_debug("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
138 kfree(slot->hotplug_slot->info);
139 kfree(slot->hotplug_slot);
143 static 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,
150 static int init_pci_slot(struct zpci_dev *zdev)
152 struct hotplug_slot *hotplug_slot;
153 struct hotplug_slot_info *info;
154 char name[SLOT_NAME_SIZE];
161 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
165 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
168 hotplug_slot->private = slot;
170 slot->hotplug_slot = hotplug_slot;
173 info = kzalloc(sizeof(*info), GFP_KERNEL);
176 hotplug_slot->info = info;
178 hotplug_slot->ops = &s390_hotplug_slot_ops;
179 hotplug_slot->release = &release_slot;
181 get_power_status(hotplug_slot, &info->power_status);
182 get_adapter_status(hotplug_slot, &info->adapter_status);
184 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
185 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
188 pr_err("pci_hp_register failed with error %d\n", rc);
191 list_add(&slot->slot_list, &s390_hotplug_slot_list);
204 static void exit_pci_slot(struct zpci_dev *zdev)
206 struct list_head *tmp, *n;
209 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
210 slot = list_entry(tmp, struct slot, slot_list);
211 if (slot->zdev != zdev)
213 list_del(&slot->slot_list);
214 pci_hp_deregister(slot->hotplug_slot);
218 static struct pci_hp_callback_ops hp_ops = {
219 .create_slot = init_pci_slot,
220 .remove_slot = exit_pci_slot,
223 static void __init init_pci_slots(void)
225 struct zpci_dev *zdev;
228 * Create a structure for each slot, and register that slot
229 * with the pci_hotplug subsystem.
231 mutex_lock(&zpci_list_lock);
232 list_for_each_entry(zdev, &zpci_list, entry) {
235 mutex_unlock(&zpci_list_lock);
238 static void __exit exit_pci_slots(void)
240 struct list_head *tmp, *n;
244 * Unregister all of our slots with the pci_hotplug subsystem.
245 * Memory will be freed in release_slot() callback after slot's
246 * lifespan is finished.
248 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
249 slot = list_entry(tmp, struct slot, slot_list);
250 list_del(&slot->slot_list);
251 pci_hp_deregister(slot->hotplug_slot);
255 static int __init pci_hotplug_s390_init(void)
260 zpci_register_hp_ops(&hp_ops);
266 static void __exit pci_hotplug_s390_exit(void)
269 zpci_deregister_hp_ops();
272 module_init(pci_hotplug_s390_init);
273 module_exit(pci_hotplug_s390_exit);