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 int enable_slot(struct hotplug_slot *hotplug_slot)
46 struct slot *slot = hotplug_slot->private;
49 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
52 rc = sclp_pci_configure(slot->zdev->fid);
53 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, rc);
55 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
56 /* automatically scan the device after is was configured */
57 zpci_enable_device(slot->zdev);
58 zpci_scan_device(slot->zdev);
63 static int disable_slot(struct hotplug_slot *hotplug_slot)
65 struct slot *slot = hotplug_slot->private;
68 if (!zpci_fn_configured(slot->zdev->state))
71 rc = zpci_disable_device(slot->zdev);
74 /* TODO: we rely on the user to unbind/remove the device, is that plausible
75 * or do we need to trigger that here?
77 rc = sclp_pci_deconfigure(slot->zdev->fid);
78 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, rc);
80 slot->zdev->state = ZPCI_FN_STATE_STANDBY;
84 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
86 struct slot *slot = hotplug_slot->private;
88 switch (slot->zdev->state) {
89 case ZPCI_FN_STATE_STANDBY:
99 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
101 /* if the slot exits it always contains a function */
106 static void release_slot(struct hotplug_slot *hotplug_slot)
108 struct slot *slot = hotplug_slot->private;
110 pr_debug("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
111 kfree(slot->hotplug_slot->info);
112 kfree(slot->hotplug_slot);
116 static struct hotplug_slot_ops s390_hotplug_slot_ops = {
117 .enable_slot = enable_slot,
118 .disable_slot = disable_slot,
119 .get_power_status = get_power_status,
120 .get_adapter_status = get_adapter_status,
123 static int init_pci_slot(struct zpci_dev *zdev)
125 struct hotplug_slot *hotplug_slot;
126 struct hotplug_slot_info *info;
127 char name[SLOT_NAME_SIZE];
134 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
138 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
141 hotplug_slot->private = slot;
143 slot->hotplug_slot = hotplug_slot;
146 info = kzalloc(sizeof(*info), GFP_KERNEL);
149 hotplug_slot->info = info;
151 hotplug_slot->ops = &s390_hotplug_slot_ops;
152 hotplug_slot->release = &release_slot;
154 get_power_status(hotplug_slot, &info->power_status);
155 get_adapter_status(hotplug_slot, &info->adapter_status);
157 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
158 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
161 pr_err("pci_hp_register failed with error %d\n", rc);
164 list_add(&slot->slot_list, &s390_hotplug_slot_list);
177 static void exit_pci_slot(struct zpci_dev *zdev)
179 struct list_head *tmp, *n;
182 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
183 slot = list_entry(tmp, struct slot, slot_list);
184 if (slot->zdev != zdev)
186 list_del(&slot->slot_list);
187 pci_hp_deregister(slot->hotplug_slot);
191 static struct pci_hp_callback_ops hp_ops = {
192 .create_slot = init_pci_slot,
193 .remove_slot = exit_pci_slot,
196 static void __init init_pci_slots(void)
198 struct zpci_dev *zdev;
201 * Create a structure for each slot, and register that slot
202 * with the pci_hotplug subsystem.
204 mutex_lock(&zpci_list_lock);
205 list_for_each_entry(zdev, &zpci_list, entry) {
208 mutex_unlock(&zpci_list_lock);
211 static void __exit exit_pci_slots(void)
213 struct list_head *tmp, *n;
217 * Unregister all of our slots with the pci_hotplug subsystem.
218 * Memory will be freed in release_slot() callback after slot's
219 * lifespan is finished.
221 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
222 slot = list_entry(tmp, struct slot, slot_list);
223 list_del(&slot->slot_list);
224 pci_hp_deregister(slot->hotplug_slot);
228 static int __init pci_hotplug_s390_init(void)
233 zpci_register_hp_ops(&hp_ops);
239 static void __exit pci_hotplug_s390_exit(void)
242 zpci_deregister_hp_ops();
245 module_init(pci_hotplug_s390_init);
246 module_exit(pci_hotplug_s390_exit);