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>
21 #define SLOT_NAME_SIZE 10
22 static LIST_HEAD(s390_hotplug_slot_list);
24 MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com");
25 MODULE_DESCRIPTION("Hot Plug PCI Controller for System z");
26 MODULE_LICENSE("GPL");
28 static int zpci_fn_configured(enum zpci_state state)
30 return state == ZPCI_FN_STATE_CONFIGURED ||
31 state == ZPCI_FN_STATE_ONLINE;
35 * struct slot - slot information for each *physical* slot
38 struct list_head slot_list;
39 struct hotplug_slot *hotplug_slot;
40 struct zpci_dev *zdev;
43 static int enable_slot(struct hotplug_slot *hotplug_slot)
45 struct slot *slot = hotplug_slot->private;
48 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
51 rc = sclp_pci_configure(slot->zdev->fid);
53 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
54 /* automatically scan the device after is was configured */
55 zpci_enable_device(slot->zdev);
56 zpci_scan_device(slot->zdev);
61 static int disable_slot(struct hotplug_slot *hotplug_slot)
63 struct slot *slot = hotplug_slot->private;
66 if (!zpci_fn_configured(slot->zdev->state))
69 /* TODO: we rely on the user to unbind/remove the device, is that plausible
70 * or do we need to trigger that here?
72 rc = sclp_pci_deconfigure(slot->zdev->fid);
74 /* Fixme: better call List-PCI to find the disabled FH
75 for the FID since the FH should be opaque... */
76 slot->zdev->fh &= 0x7fffffff;
77 slot->zdev->state = ZPCI_FN_STATE_STANDBY;
82 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
84 struct slot *slot = hotplug_slot->private;
86 switch (slot->zdev->state) {
87 case ZPCI_FN_STATE_STANDBY:
97 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
99 /* if the slot exits it always contains a function */
104 static void release_slot(struct hotplug_slot *hotplug_slot)
106 struct slot *slot = hotplug_slot->private;
108 pr_debug("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
109 kfree(slot->hotplug_slot->info);
110 kfree(slot->hotplug_slot);
114 static struct hotplug_slot_ops s390_hotplug_slot_ops = {
115 .enable_slot = enable_slot,
116 .disable_slot = disable_slot,
117 .get_power_status = get_power_status,
118 .get_adapter_status = get_adapter_status,
121 static int init_pci_slot(struct zpci_dev *zdev)
123 struct hotplug_slot *hotplug_slot;
124 struct hotplug_slot_info *info;
125 char name[SLOT_NAME_SIZE];
132 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
136 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
139 hotplug_slot->private = slot;
141 slot->hotplug_slot = hotplug_slot;
144 info = kzalloc(sizeof(*info), GFP_KERNEL);
147 hotplug_slot->info = info;
149 hotplug_slot->ops = &s390_hotplug_slot_ops;
150 hotplug_slot->release = &release_slot;
152 get_power_status(hotplug_slot, &info->power_status);
153 get_adapter_status(hotplug_slot, &info->adapter_status);
155 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
156 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
159 pr_err("pci_hp_register failed with error %d\n", rc);
162 list_add(&slot->slot_list, &s390_hotplug_slot_list);
175 static void exit_pci_slot(struct zpci_dev *zdev)
177 struct list_head *tmp, *n;
180 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
181 slot = list_entry(tmp, struct slot, slot_list);
182 if (slot->zdev != zdev)
184 list_del(&slot->slot_list);
185 pci_hp_deregister(slot->hotplug_slot);
189 static struct pci_hp_callback_ops hp_ops = {
190 .create_slot = init_pci_slot,
191 .remove_slot = exit_pci_slot,
194 static void __init init_pci_slots(void)
196 struct zpci_dev *zdev;
199 * Create a structure for each slot, and register that slot
200 * with the pci_hotplug subsystem.
202 mutex_lock(&zpci_list_lock);
203 list_for_each_entry(zdev, &zpci_list, entry) {
206 mutex_unlock(&zpci_list_lock);
209 static void __exit exit_pci_slots(void)
211 struct list_head *tmp, *n;
215 * Unregister all of our slots with the pci_hotplug subsystem.
216 * Memory will be freed in release_slot() callback after slot's
217 * lifespan is finished.
219 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
220 slot = list_entry(tmp, struct slot, slot_list);
221 list_del(&slot->slot_list);
222 pci_hp_deregister(slot->hotplug_slot);
226 static int __init pci_hotplug_s390_init(void)
231 zpci_register_hp_ops(&hp_ops);
237 static void __exit pci_hotplug_s390_exit(void)
240 zpci_deregister_hp_ops();
243 module_init(pci_hotplug_s390_init);
244 module_exit(pci_hotplug_s390_exit);