2 * PCI Hot Plug Controller Driver for System z
4 * Copyright 2012 IBM Corp.
7 * Jan Glauber <jang@linux.vnet.ibm.com>
10 #define KMSG_COMPONENT "zpci"
11 #define pr_fmt(fmt) KMSG_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 <asm/pci_debug.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 inline int slot_configure(struct slot *slot)
45 int ret = sclp_pci_configure(slot->zdev->fid);
47 zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
49 slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
54 static inline int slot_deconfigure(struct slot *slot)
56 int ret = sclp_pci_deconfigure(slot->zdev->fid);
58 zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
60 slot->zdev->state = ZPCI_FN_STATE_STANDBY;
65 static int enable_slot(struct hotplug_slot *hotplug_slot)
67 struct slot *slot = hotplug_slot->private;
70 if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
73 rc = slot_configure(slot);
77 rc = zpci_enable_device(slot->zdev);
81 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
82 pci_lock_rescan_remove();
83 pci_bus_add_devices(slot->zdev->bus);
84 pci_unlock_rescan_remove();
89 slot_deconfigure(slot);
93 static int disable_slot(struct hotplug_slot *hotplug_slot)
95 struct slot *slot = hotplug_slot->private;
99 if (!zpci_fn_configured(slot->zdev->state))
102 pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN);
104 pci_stop_and_remove_bus_device_locked(pdev);
108 rc = zpci_disable_device(slot->zdev);
112 return slot_deconfigure(slot);
115 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
117 struct slot *slot = hotplug_slot->private;
119 switch (slot->zdev->state) {
120 case ZPCI_FN_STATE_STANDBY:
130 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
132 /* if the slot exits it always contains a function */
137 static void release_slot(struct hotplug_slot *hotplug_slot)
139 struct slot *slot = hotplug_slot->private;
141 kfree(slot->hotplug_slot->info);
142 kfree(slot->hotplug_slot);
146 static struct hotplug_slot_ops s390_hotplug_slot_ops = {
147 .enable_slot = enable_slot,
148 .disable_slot = disable_slot,
149 .get_power_status = get_power_status,
150 .get_adapter_status = get_adapter_status,
153 int zpci_init_slot(struct zpci_dev *zdev)
155 struct hotplug_slot *hotplug_slot;
156 struct hotplug_slot_info *info;
157 char name[SLOT_NAME_SIZE];
164 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
168 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
171 hotplug_slot->private = slot;
173 slot->hotplug_slot = hotplug_slot;
176 info = kzalloc(sizeof(*info), GFP_KERNEL);
179 hotplug_slot->info = info;
181 hotplug_slot->ops = &s390_hotplug_slot_ops;
182 hotplug_slot->release = &release_slot;
184 get_power_status(hotplug_slot, &info->power_status);
185 get_adapter_status(hotplug_slot, &info->adapter_status);
187 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
188 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
193 list_add(&slot->slot_list, &s390_hotplug_slot_list);
206 void zpci_exit_slot(struct zpci_dev *zdev)
208 struct slot *slot, *next;
210 list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list,
212 if (slot->zdev != zdev)
214 list_del(&slot->slot_list);
215 pci_hp_deregister(slot->hotplug_slot);