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 pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
83 pci_bus_add_devices(slot->zdev->bus);
88 slot_deconfigure(slot);
92 static int disable_slot(struct hotplug_slot *hotplug_slot)
94 struct slot *slot = hotplug_slot->private;
97 if (!zpci_fn_configured(slot->zdev->state))
100 if (slot->zdev->pdev)
101 pci_stop_and_remove_bus_device(slot->zdev->pdev);
103 rc = zpci_disable_device(slot->zdev);
107 return slot_deconfigure(slot);
110 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
112 struct slot *slot = hotplug_slot->private;
114 switch (slot->zdev->state) {
115 case ZPCI_FN_STATE_STANDBY:
125 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
127 /* if the slot exits it always contains a function */
132 static void release_slot(struct hotplug_slot *hotplug_slot)
134 struct slot *slot = hotplug_slot->private;
136 kfree(slot->hotplug_slot->info);
137 kfree(slot->hotplug_slot);
141 static struct hotplug_slot_ops s390_hotplug_slot_ops = {
142 .enable_slot = enable_slot,
143 .disable_slot = disable_slot,
144 .get_power_status = get_power_status,
145 .get_adapter_status = get_adapter_status,
148 int zpci_init_slot(struct zpci_dev *zdev)
150 struct hotplug_slot *hotplug_slot;
151 struct hotplug_slot_info *info;
152 char name[SLOT_NAME_SIZE];
159 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
163 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
166 hotplug_slot->private = slot;
168 slot->hotplug_slot = hotplug_slot;
171 info = kzalloc(sizeof(*info), GFP_KERNEL);
174 hotplug_slot->info = info;
176 hotplug_slot->ops = &s390_hotplug_slot_ops;
177 hotplug_slot->release = &release_slot;
179 get_power_status(hotplug_slot, &info->power_status);
180 get_adapter_status(hotplug_slot, &info->adapter_status);
182 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
183 rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
188 list_add(&slot->slot_list, &s390_hotplug_slot_list);
201 void zpci_exit_slot(struct zpci_dev *zdev)
203 struct list_head *tmp, *n;
206 list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
207 slot = list_entry(tmp, struct slot, slot_list);
208 if (slot->zdev != zdev)
210 list_del(&slot->slot_list);
211 pci_hp_deregister(slot->hotplug_slot);