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 enable_slot(struct hotplug_slot *hotplug_slot)
25 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
29 if (zdev->state != ZPCI_FN_STATE_STANDBY)
32 rc = sclp_pci_configure(zdev->fid);
33 zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, rc);
36 zdev->state = ZPCI_FN_STATE_CONFIGURED;
38 return zpci_scan_configured_device(zdev, zdev->fh);
41 static int disable_slot(struct hotplug_slot *hotplug_slot)
43 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
47 if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
50 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
51 if (pdev && pci_num_vf(pdev)) {
57 return zpci_deconfigure_device(zdev);
60 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
62 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
65 switch (zdev->state) {
66 case ZPCI_FN_STATE_STANDBY:
76 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
78 /* if the slot exits it always contains a function */
83 static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
84 .enable_slot = enable_slot,
85 .disable_slot = disable_slot,
86 .get_power_status = get_power_status,
87 .get_adapter_status = get_adapter_status,
90 int zpci_init_slot(struct zpci_dev *zdev)
92 char name[SLOT_NAME_SIZE];
93 struct zpci_bus *zbus = zdev->zbus;
95 zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
97 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
98 return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
102 void zpci_exit_slot(struct zpci_dev *zdev)
104 pci_hp_deregister(&zdev->hotplug_slot);