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 mutex_lock(&zdev->state_lock);
30 if (zdev->state != ZPCI_FN_STATE_STANDBY) {
35 rc = sclp_pci_configure(zdev->fid);
36 zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, rc);
39 zdev->state = ZPCI_FN_STATE_CONFIGURED;
41 rc = zpci_scan_configured_device(zdev, zdev->fh);
43 mutex_unlock(&zdev->state_lock);
47 static int disable_slot(struct hotplug_slot *hotplug_slot)
49 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
51 struct pci_dev *pdev = NULL;
54 mutex_lock(&zdev->state_lock);
55 if (zdev->state != ZPCI_FN_STATE_CONFIGURED) {
60 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
61 if (pdev && pci_num_vf(pdev)) {
67 rc = zpci_deconfigure_device(zdev);
69 mutex_unlock(&zdev->state_lock);
75 static int reset_slot(struct hotplug_slot *hotplug_slot, bool probe)
77 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
82 * If we can't get the zdev->state_lock the device state is
83 * currently undergoing a transition and we bail out - just
84 * the same as if the device's state is not configured at all.
86 if (!mutex_trylock(&zdev->state_lock))
89 /* We can reset only if the function is configured */
90 if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
98 rc = zpci_hot_reset_device(zdev);
100 mutex_unlock(&zdev->state_lock);
104 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
106 struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
109 *value = zpci_is_device_configured(zdev) ? 1 : 0;
113 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
115 /* if the slot exits it always contains a function */
120 static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
121 .enable_slot = enable_slot,
122 .disable_slot = disable_slot,
123 .reset_slot = reset_slot,
124 .get_power_status = get_power_status,
125 .get_adapter_status = get_adapter_status,
128 int zpci_init_slot(struct zpci_dev *zdev)
130 char name[SLOT_NAME_SIZE];
131 struct zpci_bus *zbus = zdev->zbus;
133 zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
135 snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
136 return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
140 void zpci_exit_slot(struct zpci_dev *zdev)
142 pci_hp_deregister(&zdev->hotplug_slot);