1 // SPDX-License-Identifier: GPL-2.0+
3 * PCI Hot Plug Controller Driver for System z
5 * Copyright 2012 IBM Corp.
8 * Jan Glauber <jang@linux.vnet.ibm.com>
11 #define KMSG_COMPONENT "zpci"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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
23 static int zpci_fn_configured(enum zpci_state state)
25 return state == ZPCI_FN_STATE_CONFIGURED ||
26 state == ZPCI_FN_STATE_ONLINE;
29 static inline int zdev_configure(struct zpci_dev *zdev)
31 int ret = sclp_pci_configure(zdev->fid);
33 zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, ret);
35 zdev->state = ZPCI_FN_STATE_CONFIGURED;
40 static inline int zdev_deconfigure(struct zpci_dev *zdev)
42 int ret = sclp_pci_deconfigure(zdev->fid);
44 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
46 zdev->state = ZPCI_FN_STATE_STANDBY;
51 static int enable_slot(struct hotplug_slot *hotplug_slot)
53 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
57 if (zdev->state != ZPCI_FN_STATE_STANDBY)
60 rc = zdev_configure(zdev);
64 rc = zpci_enable_device(zdev);
68 pci_scan_slot(zdev->bus, ZPCI_DEVFN);
69 pci_lock_rescan_remove();
70 pci_bus_add_devices(zdev->bus);
71 pci_unlock_rescan_remove();
76 zdev_deconfigure(zdev);
80 static int disable_slot(struct hotplug_slot *hotplug_slot)
82 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
87 if (!zpci_fn_configured(zdev->state))
90 pdev = pci_get_slot(zdev->bus, ZPCI_DEVFN);
92 pci_stop_and_remove_bus_device_locked(pdev);
96 rc = zpci_disable_device(zdev);
100 return zdev_deconfigure(zdev);
103 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
105 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
108 switch (zdev->state) {
109 case ZPCI_FN_STATE_STANDBY:
119 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
121 /* if the slot exits it always contains a function */
126 static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
127 .enable_slot = enable_slot,
128 .disable_slot = disable_slot,
129 .get_power_status = get_power_status,
130 .get_adapter_status = get_adapter_status,
133 int zpci_init_slot(struct zpci_dev *zdev)
135 char name[SLOT_NAME_SIZE];
137 zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
139 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
140 return pci_hp_register(&zdev->hotplug_slot, zdev->bus,
144 void zpci_exit_slot(struct zpci_dev *zdev)
146 pci_hp_deregister(&zdev->hotplug_slot);