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,
55 struct zpci_bus *zbus = zdev->zbus;
58 if (zdev->state != ZPCI_FN_STATE_STANDBY)
61 rc = zdev_configure(zdev);
65 rc = zpci_enable_device(zdev);
69 pci_scan_slot(zbus->bus, zdev->devfn);
70 pci_lock_rescan_remove();
71 pci_bus_add_devices(zbus->bus);
72 pci_unlock_rescan_remove();
77 zdev_deconfigure(zdev);
81 static int disable_slot(struct hotplug_slot *hotplug_slot)
83 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
88 if (!zpci_fn_configured(zdev->state))
91 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
92 if (pdev && pci_num_vf(pdev)) {
98 zpci_remove_device(zdev, false);
100 rc = zpci_disable_device(zdev);
104 return zdev_deconfigure(zdev);
107 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
109 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
112 *value = zpci_is_device_configured(zdev) ? 1 : 0;
116 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
118 /* if the slot exits it always contains a function */
123 static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
124 .enable_slot = enable_slot,
125 .disable_slot = disable_slot,
126 .get_power_status = get_power_status,
127 .get_adapter_status = get_adapter_status,
130 int zpci_init_slot(struct zpci_dev *zdev)
132 char name[SLOT_NAME_SIZE];
133 struct zpci_bus *zbus = zdev->zbus;
135 zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
137 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
138 return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
142 void zpci_exit_slot(struct zpci_dev *zdev)
144 pci_hp_deregister(&zdev->hotplug_slot);