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// SPDX-License-Identifier: GPL-2.0+
/*
* PCI Hot Plug Controller Driver for System z
*
* Copyright 2012 IBM Corp.
*
* Author(s):
* Jan Glauber <jang@linux.vnet.ibm.com>
*/
#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <asm/pci_debug.h>
#include <asm/sclp.h>
#define SLOT_NAME_SIZE 10
static int enable_slot(struct hotplug_slot *hotplug_slot)
{
struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
hotplug_slot);
int rc;
mutex_lock(&zdev->state_lock);
if (zdev->state != ZPCI_FN_STATE_STANDBY) {
rc = -EIO;
goto out;
}
rc = sclp_pci_configure(zdev->fid);
zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, rc);
if (rc)
goto out;
zdev->state = ZPCI_FN_STATE_CONFIGURED;
rc = zpci_scan_configured_device(zdev, zdev->fh);
out:
mutex_unlock(&zdev->state_lock);
return rc;
}
static int disable_slot(struct hotplug_slot *hotplug_slot)
{
struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
hotplug_slot);
struct pci_dev *pdev = NULL;
int rc;
mutex_lock(&zdev->state_lock);
if (zdev->state != ZPCI_FN_STATE_CONFIGURED) {
rc = -EIO;
goto out;
}
pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
if (pdev && pci_num_vf(pdev)) {
rc = -EBUSY;
goto out;
}
rc = zpci_deconfigure_device(zdev);
out:
if (pdev)
pci_dev_put(pdev);
mutex_unlock(&zdev->state_lock);
return rc;
}
static int reset_slot(struct hotplug_slot *hotplug_slot, bool probe)
{
struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
hotplug_slot);
int rc = -EIO;
/*
* If we can't get the zdev->state_lock the device state is
* currently undergoing a transition and we bail out - just
* the same as if the device's state is not configured at all.
*/
if (!mutex_trylock(&zdev->state_lock))
return rc;
/* We can reset only if the function is configured */
if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
goto out;
if (probe) {
rc = 0;
goto out;
}
rc = zpci_hot_reset_device(zdev);
out:
mutex_unlock(&zdev->state_lock);
return rc;
}
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
hotplug_slot);
*value = zpci_is_device_configured(zdev) ? 1 : 0;
return 0;
}
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
/* if the slot exists it always contains a function */
*value = 1;
return 0;
}
static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.reset_slot = reset_slot,
.get_power_status = get_power_status,
.get_adapter_status = get_adapter_status,
};
int zpci_init_slot(struct zpci_dev *zdev)
{
char name[SLOT_NAME_SIZE];
struct zpci_bus *zbus = zdev->zbus;
zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
zdev->devfn, name);
}
void zpci_exit_slot(struct zpci_dev *zdev)
{
pci_hp_deregister(&zdev->hotplug_slot);
}
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